1ebccf1e3SJoseph Koshy /*- 2718cf2ccSPedro F. Giffuni * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3718cf2ccSPedro F. Giffuni * 4122ccdc1SJoseph Koshy * Copyright (c) 2003-2008 Joseph Koshy 5d07f36b0SJoseph Koshy * Copyright (c) 2007 The FreeBSD Foundation 6e6b475e0SMatt Macy * Copyright (c) 2018 Matthew Macy 7ebccf1e3SJoseph Koshy * All rights reserved. 8ebccf1e3SJoseph Koshy * 9d07f36b0SJoseph Koshy * Portions of this software were developed by A. Joseph Koshy under 10d07f36b0SJoseph Koshy * sponsorship from the FreeBSD Foundation and Google, Inc. 11d07f36b0SJoseph Koshy * 12ebccf1e3SJoseph Koshy * Redistribution and use in source and binary forms, with or without 13ebccf1e3SJoseph Koshy * modification, are permitted provided that the following conditions 14ebccf1e3SJoseph Koshy * are met: 15ebccf1e3SJoseph Koshy * 1. Redistributions of source code must retain the above copyright 16ebccf1e3SJoseph Koshy * notice, this list of conditions and the following disclaimer. 17ebccf1e3SJoseph Koshy * 2. Redistributions in binary form must reproduce the above copyright 18ebccf1e3SJoseph Koshy * notice, this list of conditions and the following disclaimer in the 19ebccf1e3SJoseph Koshy * documentation and/or other materials provided with the distribution. 20ebccf1e3SJoseph Koshy * 21ebccf1e3SJoseph Koshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22ebccf1e3SJoseph Koshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23ebccf1e3SJoseph Koshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24ebccf1e3SJoseph Koshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25ebccf1e3SJoseph Koshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26ebccf1e3SJoseph Koshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27ebccf1e3SJoseph Koshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28ebccf1e3SJoseph Koshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29ebccf1e3SJoseph Koshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30ebccf1e3SJoseph Koshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31ebccf1e3SJoseph Koshy * SUCH DAMAGE. 32ebccf1e3SJoseph Koshy * 33ebccf1e3SJoseph Koshy */ 34ebccf1e3SJoseph Koshy 35ebccf1e3SJoseph Koshy #include <sys/cdefs.h> 36ebccf1e3SJoseph Koshy __FBSDID("$FreeBSD$"); 37ebccf1e3SJoseph Koshy 38ebccf1e3SJoseph Koshy #include <sys/param.h> 39ebccf1e3SJoseph Koshy #include <sys/eventhandler.h> 40ebccf1e3SJoseph Koshy #include <sys/jail.h> 41ebccf1e3SJoseph Koshy #include <sys/kernel.h> 42f263522aSJoseph Koshy #include <sys/kthread.h> 43ebccf1e3SJoseph Koshy #include <sys/limits.h> 44ebccf1e3SJoseph Koshy #include <sys/lock.h> 45ebccf1e3SJoseph Koshy #include <sys/malloc.h> 46ebccf1e3SJoseph Koshy #include <sys/module.h> 47e9b5dc16SJoseph Koshy #include <sys/mount.h> 48ebccf1e3SJoseph Koshy #include <sys/mutex.h> 49ebccf1e3SJoseph Koshy #include <sys/pmc.h> 50ebccf1e3SJoseph Koshy #include <sys/pmckern.h> 51f263522aSJoseph Koshy #include <sys/pmclog.h> 52acd3428bSRobert Watson #include <sys/priv.h> 53ebccf1e3SJoseph Koshy #include <sys/proc.h> 54ebccf1e3SJoseph Koshy #include <sys/queue.h> 55f263522aSJoseph Koshy #include <sys/resourcevar.h> 5689f6b863SAttilio Rao #include <sys/rwlock.h> 57ebccf1e3SJoseph Koshy #include <sys/sched.h> 58ebccf1e3SJoseph Koshy #include <sys/signalvar.h> 59ebccf1e3SJoseph Koshy #include <sys/smp.h> 60ebccf1e3SJoseph Koshy #include <sys/sx.h> 61ebccf1e3SJoseph Koshy #include <sys/sysctl.h> 62ebccf1e3SJoseph Koshy #include <sys/sysent.h> 63ebccf1e3SJoseph Koshy #include <sys/systm.h> 64f263522aSJoseph Koshy #include <sys/vnode.h> 65ebccf1e3SJoseph Koshy 6649874f6eSJoseph Koshy #include <sys/linker.h> /* needs to be after <sys/malloc.h> */ 6749874f6eSJoseph Koshy 68f263522aSJoseph Koshy #include <machine/atomic.h> 69ebccf1e3SJoseph Koshy #include <machine/md_var.h> 70ebccf1e3SJoseph Koshy 71bf792d68SJoseph Koshy #include <vm/vm.h> 72bf792d68SJoseph Koshy #include <vm/vm_extern.h> 73bf792d68SJoseph Koshy #include <vm/pmap.h> 74bf792d68SJoseph Koshy #include <vm/vm_map.h> 75bf792d68SJoseph Koshy #include <vm/vm_object.h> 76bf792d68SJoseph Koshy 77f5f9340bSFabien Thomas #include "hwpmc_soft.h" 78f5f9340bSFabien Thomas 79f1401123SMatt Macy #ifdef NUMA 80f1401123SMatt Macy #define NDOMAINS vm_ndomains 81f1401123SMatt Macy #else 82f1401123SMatt Macy #define NDOMAINS 1 83f1401123SMatt Macy #define malloc_domain(size, type, domain, flags) malloc((size), (type), (flags)) 84f1401123SMatt Macy #define free_domain(addr, type) free(addr, type) 85f1401123SMatt Macy #endif 86f1401123SMatt Macy 87ebccf1e3SJoseph Koshy /* 88ebccf1e3SJoseph Koshy * Types 89ebccf1e3SJoseph Koshy */ 90ebccf1e3SJoseph Koshy 91ebccf1e3SJoseph Koshy enum pmc_flags { 92ebccf1e3SJoseph Koshy PMC_FLAG_NONE = 0x00, /* do nothing */ 93ebccf1e3SJoseph Koshy PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */ 94ebccf1e3SJoseph Koshy PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */ 95ebccf1e3SJoseph Koshy }; 96ebccf1e3SJoseph Koshy 97ebccf1e3SJoseph Koshy /* 98ebccf1e3SJoseph Koshy * The offset in sysent where the syscall is allocated. 99ebccf1e3SJoseph Koshy */ 100ebccf1e3SJoseph Koshy 101ebccf1e3SJoseph Koshy static int pmc_syscall_num = NO_SYSCALL; 102ebccf1e3SJoseph Koshy struct pmc_cpu **pmc_pcpu; /* per-cpu state */ 103ebccf1e3SJoseph Koshy pmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */ 104ebccf1e3SJoseph Koshy 105ebccf1e3SJoseph Koshy #define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)] 106ebccf1e3SJoseph Koshy 107ebccf1e3SJoseph Koshy struct mtx_pool *pmc_mtxpool; 108ebccf1e3SJoseph Koshy static int *pmc_pmcdisp; /* PMC row dispositions */ 109ebccf1e3SJoseph Koshy 110ebccf1e3SJoseph Koshy #define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0) 111ebccf1e3SJoseph Koshy #define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0) 112ebccf1e3SJoseph Koshy #define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0) 113ebccf1e3SJoseph Koshy 114ebccf1e3SJoseph Koshy #define PMC_MARK_ROW_FREE(R) do { \ 115ebccf1e3SJoseph Koshy pmc_pmcdisp[(R)] = 0; \ 116ebccf1e3SJoseph Koshy } while (0) 117ebccf1e3SJoseph Koshy 118ebccf1e3SJoseph Koshy #define PMC_MARK_ROW_STANDALONE(R) do { \ 119ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 120ebccf1e3SJoseph Koshy __LINE__)); \ 121ebccf1e3SJoseph Koshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 122122ccdc1SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] >= (-pmc_cpu_max_active()), \ 123122ccdc1SJoseph Koshy ("[pmc,%d] row disposition error", __LINE__)); \ 124ebccf1e3SJoseph Koshy } while (0) 125ebccf1e3SJoseph Koshy 126ebccf1e3SJoseph Koshy #define PMC_UNMARK_ROW_STANDALONE(R) do { \ 127ebccf1e3SJoseph Koshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 128ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 129ebccf1e3SJoseph Koshy __LINE__)); \ 130ebccf1e3SJoseph Koshy } while (0) 131ebccf1e3SJoseph Koshy 132ebccf1e3SJoseph Koshy #define PMC_MARK_ROW_THREAD(R) do { \ 133ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 134ebccf1e3SJoseph Koshy __LINE__)); \ 135ebccf1e3SJoseph Koshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 136ebccf1e3SJoseph Koshy } while (0) 137ebccf1e3SJoseph Koshy 138ebccf1e3SJoseph Koshy #define PMC_UNMARK_ROW_THREAD(R) do { \ 139ebccf1e3SJoseph Koshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 140ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 141ebccf1e3SJoseph Koshy __LINE__)); \ 142ebccf1e3SJoseph Koshy } while (0) 143ebccf1e3SJoseph Koshy 144ebccf1e3SJoseph Koshy 145ebccf1e3SJoseph Koshy /* various event handlers */ 14629f4e216SMark Johnston static eventhandler_tag pmc_exit_tag, pmc_fork_tag, pmc_kld_load_tag, 14729f4e216SMark Johnston pmc_kld_unload_tag; 148ebccf1e3SJoseph Koshy 149ebccf1e3SJoseph Koshy /* Module statistics */ 150e6b475e0SMatt Macy struct pmc_driverstats pmc_stats; 151e6b475e0SMatt Macy 152ebccf1e3SJoseph Koshy 153ebccf1e3SJoseph Koshy /* Machine/processor dependent operations */ 1540cfab8ddSJoseph Koshy static struct pmc_mdep *md; 155ebccf1e3SJoseph Koshy 156ebccf1e3SJoseph Koshy /* 157ebccf1e3SJoseph Koshy * Hash tables mapping owner processes and target threads to PMCs. 158ebccf1e3SJoseph Koshy */ 159ebccf1e3SJoseph Koshy 160ebccf1e3SJoseph Koshy struct mtx pmc_processhash_mtx; /* spin mutex */ 161ebccf1e3SJoseph Koshy static u_long pmc_processhashmask; 162ebccf1e3SJoseph Koshy static LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash; 163ebccf1e3SJoseph Koshy 164ebccf1e3SJoseph Koshy /* 165ebccf1e3SJoseph Koshy * Hash table of PMC owner descriptors. This table is protected by 166ebccf1e3SJoseph Koshy * the shared PMC "sx" lock. 167ebccf1e3SJoseph Koshy */ 168ebccf1e3SJoseph Koshy 169ebccf1e3SJoseph Koshy static u_long pmc_ownerhashmask; 170ebccf1e3SJoseph Koshy static LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash; 171ebccf1e3SJoseph Koshy 172ebccf1e3SJoseph Koshy /* 173f263522aSJoseph Koshy * List of PMC owners with system-wide sampling PMCs. 174f263522aSJoseph Koshy */ 175f263522aSJoseph Koshy 176f263522aSJoseph Koshy static LIST_HEAD(, pmc_owner) pmc_ss_owners; 177f263522aSJoseph Koshy 178f263522aSJoseph Koshy 179f263522aSJoseph Koshy /* 180e829eb6dSJoseph Koshy * A map of row indices to classdep structures. 181e829eb6dSJoseph Koshy */ 182e829eb6dSJoseph Koshy static struct pmc_classdep **pmc_rowindex_to_classdep; 183e829eb6dSJoseph Koshy 184e829eb6dSJoseph Koshy /* 185ebccf1e3SJoseph Koshy * Prototypes 186ebccf1e3SJoseph Koshy */ 187ebccf1e3SJoseph Koshy 188680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 189ebccf1e3SJoseph Koshy static int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 190ebccf1e3SJoseph Koshy static int pmc_debugflags_parse(char *newstr, char *fence); 191ebccf1e3SJoseph Koshy #endif 192ebccf1e3SJoseph Koshy 193ebccf1e3SJoseph Koshy static int load(struct module *module, int cmd, void *arg); 194f263522aSJoseph Koshy static int pmc_attach_process(struct proc *p, struct pmc *pm); 195ebccf1e3SJoseph Koshy static struct pmc *pmc_allocate_pmc_descriptor(void); 196f263522aSJoseph Koshy static struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 197f263522aSJoseph Koshy static int pmc_attach_one_process(struct proc *p, struct pmc *pm); 198c5153e19SJoseph Koshy static int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 199c5153e19SJoseph Koshy int cpu); 200f263522aSJoseph Koshy static int pmc_can_attach(struct pmc *pm, struct proc *p); 201f5f9340bSFabien Thomas static void pmc_capture_user_callchain(int cpu, int soft, struct trapframe *tf); 202f263522aSJoseph Koshy static void pmc_cleanup(void); 203f263522aSJoseph Koshy static int pmc_detach_process(struct proc *p, struct pmc *pm); 204f263522aSJoseph Koshy static int pmc_detach_one_process(struct proc *p, struct pmc *pm, 205f263522aSJoseph Koshy int flags); 206f263522aSJoseph Koshy static void pmc_destroy_owner_descriptor(struct pmc_owner *po); 20706796b67SMark Johnston static void pmc_destroy_pmc_descriptor(struct pmc *pm); 208ebccf1e3SJoseph Koshy static struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 209ebccf1e3SJoseph Koshy static int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 210f263522aSJoseph Koshy static struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 211f263522aSJoseph Koshy pmc_id_t pmc); 212f263522aSJoseph Koshy static struct pmc_process *pmc_find_process_descriptor(struct proc *p, 213f263522aSJoseph Koshy uint32_t mode); 214c5153e19SJoseph Koshy static void pmc_force_context_switch(void); 215ebccf1e3SJoseph Koshy static void pmc_link_target_process(struct pmc *pm, 216ebccf1e3SJoseph Koshy struct pmc_process *pp); 217d07f36b0SJoseph Koshy static void pmc_log_all_process_mappings(struct pmc_owner *po); 218d07f36b0SJoseph Koshy static void pmc_log_kernel_mappings(struct pmc *pm); 219d07f36b0SJoseph Koshy static void pmc_log_process_mappings(struct pmc_owner *po, struct proc *p); 220f263522aSJoseph Koshy static void pmc_maybe_remove_owner(struct pmc_owner *po); 221f263522aSJoseph Koshy static void pmc_process_csw_in(struct thread *td); 222f263522aSJoseph Koshy static void pmc_process_csw_out(struct thread *td); 223ebccf1e3SJoseph Koshy static void pmc_process_exit(void *arg, struct proc *p); 224ebccf1e3SJoseph Koshy static void pmc_process_fork(void *arg, struct proc *p1, 225ebccf1e3SJoseph Koshy struct proc *p2, int n); 226f5f9340bSFabien Thomas static void pmc_process_samples(int cpu, int soft); 227f263522aSJoseph Koshy static void pmc_release_pmc_descriptor(struct pmc *pmc); 228f263522aSJoseph Koshy static void pmc_remove_owner(struct pmc_owner *po); 229f263522aSJoseph Koshy static void pmc_remove_process_descriptor(struct pmc_process *pp); 230f263522aSJoseph Koshy static void pmc_restore_cpu_binding(struct pmc_binding *pb); 231f263522aSJoseph Koshy static void pmc_save_cpu_binding(struct pmc_binding *pb); 232f263522aSJoseph Koshy static void pmc_select_cpu(int cpu); 233ebccf1e3SJoseph Koshy static int pmc_start(struct pmc *pm); 234ebccf1e3SJoseph Koshy static int pmc_stop(struct pmc *pm); 235f263522aSJoseph Koshy static int pmc_syscall_handler(struct thread *td, void *syscall_args); 236f263522aSJoseph Koshy static void pmc_unlink_target_process(struct pmc *pmc, 237f263522aSJoseph Koshy struct pmc_process *pp); 238f5f9340bSFabien Thomas static int generic_switch_in(struct pmc_cpu *pc, struct pmc_process *pp); 239f5f9340bSFabien Thomas static int generic_switch_out(struct pmc_cpu *pc, struct pmc_process *pp); 240f5f9340bSFabien Thomas static struct pmc_mdep *pmc_generic_cpu_initialize(void); 241f5f9340bSFabien Thomas static void pmc_generic_cpu_finalize(struct pmc_mdep *md); 242ebccf1e3SJoseph Koshy 243ebccf1e3SJoseph Koshy /* 244ebccf1e3SJoseph Koshy * Kernel tunables and sysctl(8) interface. 245ebccf1e3SJoseph Koshy */ 246ebccf1e3SJoseph Koshy 247f5f9340bSFabien Thomas SYSCTL_DECL(_kern_hwpmc); 248e6b475e0SMatt Macy SYSCTL_NODE(_kern_hwpmc, OID_AUTO, stats, CTLFLAG_RW, 0, "HWPMC stats"); 249e6b475e0SMatt Macy 250e6b475e0SMatt Macy 251e6b475e0SMatt Macy /* Stats. */ 252e6b475e0SMatt Macy SYSCTL_COUNTER_U64(_kern_hwpmc_stats, OID_AUTO, intr_ignored, CTLFLAG_RW, 253e6b475e0SMatt Macy &pmc_stats.pm_intr_ignored, "# of interrupts ignored"); 254e6b475e0SMatt Macy SYSCTL_COUNTER_U64(_kern_hwpmc_stats, OID_AUTO, intr_processed, CTLFLAG_RW, 255e6b475e0SMatt Macy &pmc_stats.pm_intr_processed, "# of interrupts processed"); 256e6b475e0SMatt Macy SYSCTL_COUNTER_U64(_kern_hwpmc_stats, OID_AUTO, intr_bufferfull, CTLFLAG_RW, 257e6b475e0SMatt Macy &pmc_stats.pm_intr_bufferfull, "# of interrupts where buffer was full"); 258e6b475e0SMatt Macy SYSCTL_COUNTER_U64(_kern_hwpmc_stats, OID_AUTO, syscalls, CTLFLAG_RW, 259e6b475e0SMatt Macy &pmc_stats.pm_syscalls, "# of syscalls"); 260e6b475e0SMatt Macy SYSCTL_COUNTER_U64(_kern_hwpmc_stats, OID_AUTO, syscall_errors, CTLFLAG_RW, 261e6b475e0SMatt Macy &pmc_stats.pm_syscall_errors, "# of syscall_errors"); 262e6b475e0SMatt Macy SYSCTL_COUNTER_U64(_kern_hwpmc_stats, OID_AUTO, buffer_requests, CTLFLAG_RW, 263e6b475e0SMatt Macy &pmc_stats.pm_buffer_requests, "# of buffer requests"); 264e6b475e0SMatt Macy SYSCTL_COUNTER_U64(_kern_hwpmc_stats, OID_AUTO, buffer_requests_failed, CTLFLAG_RW, 265e6b475e0SMatt Macy &pmc_stats.pm_buffer_requests_failed, "# of buffer requests which failed"); 266e6b475e0SMatt Macy SYSCTL_COUNTER_U64(_kern_hwpmc_stats, OID_AUTO, log_sweeps, CTLFLAG_RW, 267e6b475e0SMatt Macy &pmc_stats.pm_log_sweeps, "# of ?"); 268ebccf1e3SJoseph Koshy 269d07f36b0SJoseph Koshy static int pmc_callchaindepth = PMC_CALLCHAIN_DEPTH; 270af3b2549SHans Petter Selasky SYSCTL_INT(_kern_hwpmc, OID_AUTO, callchaindepth, CTLFLAG_RDTUN, 271d07f36b0SJoseph Koshy &pmc_callchaindepth, 0, "depth of call chain records"); 272d07f36b0SJoseph Koshy 273e6b475e0SMatt Macy char pmc_cpuid[64]; 274e6b475e0SMatt Macy SYSCTL_STRING(_kern_hwpmc, OID_AUTO, cpuid, CTLFLAG_RD, 275e6b475e0SMatt Macy pmc_cpuid, 0, "cpu version string"); 276680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 277f263522aSJoseph Koshy struct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 278ebccf1e3SJoseph Koshy char pmc_debugstr[PMC_DEBUG_STRSIZE]; 279ebccf1e3SJoseph Koshy TUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 280ebccf1e3SJoseph Koshy sizeof(pmc_debugstr)); 281ebccf1e3SJoseph Koshy SYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 282af3b2549SHans Petter Selasky CTLTYPE_STRING | CTLFLAG_RWTUN | CTLFLAG_NOFETCH, 283ebccf1e3SJoseph Koshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 284ebccf1e3SJoseph Koshy #endif 285ebccf1e3SJoseph Koshy 286e6b475e0SMatt Macy 287ebccf1e3SJoseph Koshy /* 288f263522aSJoseph Koshy * kern.hwpmc.hashrows -- determines the number of rows in the 289ebccf1e3SJoseph Koshy * of the hash table used to look up threads 290ebccf1e3SJoseph Koshy */ 291ebccf1e3SJoseph Koshy 292ebccf1e3SJoseph Koshy static int pmc_hashsize = PMC_HASH_SIZE; 293af3b2549SHans Petter Selasky SYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_RDTUN, 294ebccf1e3SJoseph Koshy &pmc_hashsize, 0, "rows in hash tables"); 295ebccf1e3SJoseph Koshy 296ebccf1e3SJoseph Koshy /* 297d07f36b0SJoseph Koshy * kern.hwpmc.nsamples --- number of PC samples/callchain stacks per CPU 298ebccf1e3SJoseph Koshy */ 299ebccf1e3SJoseph Koshy 300f263522aSJoseph Koshy static int pmc_nsamples = PMC_NSAMPLES; 301af3b2549SHans Petter Selasky SYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_RDTUN, 302f263522aSJoseph Koshy &pmc_nsamples, 0, "number of PC samples per CPU"); 303ebccf1e3SJoseph Koshy 304d07f36b0SJoseph Koshy 305ebccf1e3SJoseph Koshy /* 306f263522aSJoseph Koshy * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool. 307ebccf1e3SJoseph Koshy */ 308ebccf1e3SJoseph Koshy 309ebccf1e3SJoseph Koshy static int pmc_mtxpool_size = PMC_MTXPOOL_SIZE; 310af3b2549SHans Petter Selasky SYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_RDTUN, 311ebccf1e3SJoseph Koshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 312ebccf1e3SJoseph Koshy 313ebccf1e3SJoseph Koshy 314ebccf1e3SJoseph Koshy /* 315ebccf1e3SJoseph Koshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 316ebccf1e3SJoseph Koshy * allocate system-wide PMCs. 317ebccf1e3SJoseph Koshy * 318ebccf1e3SJoseph Koshy * Allowing unprivileged processes to allocate system PMCs is convenient 319ebccf1e3SJoseph Koshy * if system-wide measurements need to be taken concurrently with other 320ebccf1e3SJoseph Koshy * per-process measurements. This feature is turned off by default. 321ebccf1e3SJoseph Koshy */ 322ebccf1e3SJoseph Koshy 323ebccf1e3SJoseph Koshy static int pmc_unprivileged_syspmcs = 0; 324af3b2549SHans Petter Selasky SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RWTUN, 325ebccf1e3SJoseph Koshy &pmc_unprivileged_syspmcs, 0, 326ebccf1e3SJoseph Koshy "allow unprivileged process to allocate system PMCs"); 327ebccf1e3SJoseph Koshy 328f263522aSJoseph Koshy /* 329f263522aSJoseph Koshy * Hash function. Discard the lower 2 bits of the pointer since 330f263522aSJoseph Koshy * these are always zero for our uses. The hash multiplier is 331f263522aSJoseph Koshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 332f263522aSJoseph Koshy */ 333ebccf1e3SJoseph Koshy 334ebccf1e3SJoseph Koshy #if LONG_BIT == 64 335ebccf1e3SJoseph Koshy #define _PMC_HM 11400714819323198486u 336ebccf1e3SJoseph Koshy #elif LONG_BIT == 32 337ebccf1e3SJoseph Koshy #define _PMC_HM 2654435769u 338ebccf1e3SJoseph Koshy #else 339ebccf1e3SJoseph Koshy #error Must know the size of 'long' to compile 340ebccf1e3SJoseph Koshy #endif 341ebccf1e3SJoseph Koshy 342ebccf1e3SJoseph Koshy #define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 343ebccf1e3SJoseph Koshy 344ebccf1e3SJoseph Koshy /* 345ebccf1e3SJoseph Koshy * Syscall structures 346ebccf1e3SJoseph Koshy */ 347ebccf1e3SJoseph Koshy 348ebccf1e3SJoseph Koshy /* The `sysent' for the new syscall */ 349ebccf1e3SJoseph Koshy static struct sysent pmc_sysent = { 3501cfbc451SKonstantin Belousov .sy_narg = 2, 3511cfbc451SKonstantin Belousov .sy_call = pmc_syscall_handler, 352ebccf1e3SJoseph Koshy }; 353ebccf1e3SJoseph Koshy 354ebccf1e3SJoseph Koshy static struct syscall_module_data pmc_syscall_mod = { 3551cfbc451SKonstantin Belousov .chainevh = load, 3561cfbc451SKonstantin Belousov .chainarg = NULL, 3571cfbc451SKonstantin Belousov .offset = &pmc_syscall_num, 3581cfbc451SKonstantin Belousov .new_sysent = &pmc_sysent, 3591cfbc451SKonstantin Belousov .old_sysent = { .sy_narg = 0, .sy_call = NULL }, 3601cfbc451SKonstantin Belousov .flags = SY_THR_STATIC_KLD, 361ebccf1e3SJoseph Koshy }; 362ebccf1e3SJoseph Koshy 363ebccf1e3SJoseph Koshy static moduledata_t pmc_mod = { 3641cfbc451SKonstantin Belousov .name = PMC_MODULE_NAME, 3651cfbc451SKonstantin Belousov .evhand = syscall_module_handler, 3661cfbc451SKonstantin Belousov .priv = &pmc_syscall_mod, 367ebccf1e3SJoseph Koshy }; 368ebccf1e3SJoseph Koshy 369fdce57a0SJohn Baldwin #ifdef EARLY_AP_STARTUP 370fdce57a0SJohn Baldwin DECLARE_MODULE(pmc, pmc_mod, SI_SUB_SYSCALLS, SI_ORDER_ANY); 371fdce57a0SJohn Baldwin #else 372ebccf1e3SJoseph Koshy DECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 373fdce57a0SJohn Baldwin #endif 374ebccf1e3SJoseph Koshy MODULE_VERSION(pmc, PMC_VERSION); 375ebccf1e3SJoseph Koshy 376680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 377f263522aSJoseph Koshy enum pmc_dbgparse_state { 378f263522aSJoseph Koshy PMCDS_WS, /* in whitespace */ 379f263522aSJoseph Koshy PMCDS_MAJOR, /* seen a major keyword */ 380f263522aSJoseph Koshy PMCDS_MINOR 381f263522aSJoseph Koshy }; 382f263522aSJoseph Koshy 383ebccf1e3SJoseph Koshy static int 384ebccf1e3SJoseph Koshy pmc_debugflags_parse(char *newstr, char *fence) 385ebccf1e3SJoseph Koshy { 386e1691ef7SJoseph Koshy char c, *p, *q; 387f263522aSJoseph Koshy struct pmc_debugflags *tmpflags; 388f263522aSJoseph Koshy int error, found, *newbits, tmp; 389f263522aSJoseph Koshy size_t kwlen; 390ebccf1e3SJoseph Koshy 391e11e3f18SDag-Erling Smørgrav tmpflags = malloc(sizeof(*tmpflags), M_PMC, M_WAITOK|M_ZERO); 392ebccf1e3SJoseph Koshy 393ebccf1e3SJoseph Koshy p = newstr; 394f263522aSJoseph Koshy error = 0; 395ebccf1e3SJoseph Koshy 396f263522aSJoseph Koshy for (; p < fence && (c = *p); p++) { 397ebccf1e3SJoseph Koshy 398f263522aSJoseph Koshy /* skip white space */ 399f263522aSJoseph Koshy if (c == ' ' || c == '\t') 400f263522aSJoseph Koshy continue; 401f263522aSJoseph Koshy 402f263522aSJoseph Koshy /* look for a keyword followed by "=" */ 403f263522aSJoseph Koshy for (q = p; p < fence && (c = *p) && c != '='; p++) 404f263522aSJoseph Koshy ; 405f263522aSJoseph Koshy if (c != '=') { 406f263522aSJoseph Koshy error = EINVAL; 407f263522aSJoseph Koshy goto done; 408ebccf1e3SJoseph Koshy } 409ebccf1e3SJoseph Koshy 410f263522aSJoseph Koshy kwlen = p - q; 411f263522aSJoseph Koshy newbits = NULL; 412ebccf1e3SJoseph Koshy 413f263522aSJoseph Koshy /* lookup flag group name */ 414f263522aSJoseph Koshy #define DBG_SET_FLAG_MAJ(S,F) \ 415f263522aSJoseph Koshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 416f263522aSJoseph Koshy newbits = &tmpflags->pdb_ ## F; 417ebccf1e3SJoseph Koshy 418f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("cpu", CPU); 419f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("csw", CSW); 420f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("logging", LOG); 421f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("module", MOD); 422f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("md", MDP); 423f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("owner", OWN); 424f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("pmc", PMC); 425f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("process", PRC); 426f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("sampling", SAM); 427ebccf1e3SJoseph Koshy 428f263522aSJoseph Koshy if (newbits == NULL) { 429f263522aSJoseph Koshy error = EINVAL; 430f263522aSJoseph Koshy goto done; 431ebccf1e3SJoseph Koshy } 432ebccf1e3SJoseph Koshy 433f263522aSJoseph Koshy p++; /* skip the '=' */ 434ebccf1e3SJoseph Koshy 435f263522aSJoseph Koshy /* Now parse the individual flags */ 436f263522aSJoseph Koshy tmp = 0; 437f263522aSJoseph Koshy newflag: 438f263522aSJoseph Koshy for (q = p; p < fence && (c = *p); p++) 439f263522aSJoseph Koshy if (c == ' ' || c == '\t' || c == ',') 440f263522aSJoseph Koshy break; 441f263522aSJoseph Koshy 442f263522aSJoseph Koshy /* p == fence or c == ws or c == "," or c == 0 */ 443f263522aSJoseph Koshy 444f263522aSJoseph Koshy if ((kwlen = p - q) == 0) { 445f263522aSJoseph Koshy *newbits = tmp; 446f263522aSJoseph Koshy continue; 447f263522aSJoseph Koshy } 448f263522aSJoseph Koshy 449f263522aSJoseph Koshy found = 0; 450f263522aSJoseph Koshy #define DBG_SET_FLAG_MIN(S,F) \ 451f263522aSJoseph Koshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 452f263522aSJoseph Koshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 453f263522aSJoseph Koshy 454f263522aSJoseph Koshy /* a '*' denotes all possible flags in the group */ 455f263522aSJoseph Koshy if (kwlen == 1 && *q == '*') 456f263522aSJoseph Koshy tmp = found = ~0; 457f263522aSJoseph Koshy /* look for individual flag names */ 458f263522aSJoseph Koshy DBG_SET_FLAG_MIN("allocaterow", ALR); 459f263522aSJoseph Koshy DBG_SET_FLAG_MIN("allocate", ALL); 460f263522aSJoseph Koshy DBG_SET_FLAG_MIN("attach", ATT); 461f263522aSJoseph Koshy DBG_SET_FLAG_MIN("bind", BND); 462f263522aSJoseph Koshy DBG_SET_FLAG_MIN("config", CFG); 463f263522aSJoseph Koshy DBG_SET_FLAG_MIN("exec", EXC); 464f263522aSJoseph Koshy DBG_SET_FLAG_MIN("exit", EXT); 465f263522aSJoseph Koshy DBG_SET_FLAG_MIN("find", FND); 466f263522aSJoseph Koshy DBG_SET_FLAG_MIN("flush", FLS); 467f263522aSJoseph Koshy DBG_SET_FLAG_MIN("fork", FRK); 468f263522aSJoseph Koshy DBG_SET_FLAG_MIN("getbuf", GTB); 469f263522aSJoseph Koshy DBG_SET_FLAG_MIN("hook", PMH); 470f263522aSJoseph Koshy DBG_SET_FLAG_MIN("init", INI); 471f263522aSJoseph Koshy DBG_SET_FLAG_MIN("intr", INT); 472f263522aSJoseph Koshy DBG_SET_FLAG_MIN("linktarget", TLK); 473f263522aSJoseph Koshy DBG_SET_FLAG_MIN("mayberemove", OMR); 474f263522aSJoseph Koshy DBG_SET_FLAG_MIN("ops", OPS); 475f263522aSJoseph Koshy DBG_SET_FLAG_MIN("read", REA); 476f263522aSJoseph Koshy DBG_SET_FLAG_MIN("register", REG); 477f263522aSJoseph Koshy DBG_SET_FLAG_MIN("release", REL); 478f263522aSJoseph Koshy DBG_SET_FLAG_MIN("remove", ORM); 479f263522aSJoseph Koshy DBG_SET_FLAG_MIN("sample", SAM); 480f263522aSJoseph Koshy DBG_SET_FLAG_MIN("scheduleio", SIO); 481f263522aSJoseph Koshy DBG_SET_FLAG_MIN("select", SEL); 482f263522aSJoseph Koshy DBG_SET_FLAG_MIN("signal", SIG); 483f263522aSJoseph Koshy DBG_SET_FLAG_MIN("swi", SWI); 484f263522aSJoseph Koshy DBG_SET_FLAG_MIN("swo", SWO); 485f263522aSJoseph Koshy DBG_SET_FLAG_MIN("start", STA); 486f263522aSJoseph Koshy DBG_SET_FLAG_MIN("stop", STO); 487f263522aSJoseph Koshy DBG_SET_FLAG_MIN("syscall", PMS); 488f263522aSJoseph Koshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 489f263522aSJoseph Koshy DBG_SET_FLAG_MIN("write", WRI); 490f263522aSJoseph Koshy if (found == 0) { 491f263522aSJoseph Koshy /* unrecognized flag name */ 492f263522aSJoseph Koshy error = EINVAL; 493f263522aSJoseph Koshy goto done; 494f263522aSJoseph Koshy } 495f263522aSJoseph Koshy 496f263522aSJoseph Koshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 497f263522aSJoseph Koshy *newbits = tmp; 498f263522aSJoseph Koshy continue; 499f263522aSJoseph Koshy } 500f263522aSJoseph Koshy 501f263522aSJoseph Koshy p++; 502f263522aSJoseph Koshy goto newflag; 503f263522aSJoseph Koshy } 504f263522aSJoseph Koshy 505f263522aSJoseph Koshy /* save the new flag set */ 506f263522aSJoseph Koshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 507f263522aSJoseph Koshy 508f263522aSJoseph Koshy done: 5091ede983cSDag-Erling Smørgrav free(tmpflags, M_PMC); 510f263522aSJoseph Koshy return error; 511ebccf1e3SJoseph Koshy } 512ebccf1e3SJoseph Koshy 513ebccf1e3SJoseph Koshy static int 514ebccf1e3SJoseph Koshy pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 515ebccf1e3SJoseph Koshy { 516ebccf1e3SJoseph Koshy char *fence, *newstr; 517ebccf1e3SJoseph Koshy int error; 518ebccf1e3SJoseph Koshy unsigned int n; 519ebccf1e3SJoseph Koshy 520ebccf1e3SJoseph Koshy (void) arg1; (void) arg2; /* unused parameters */ 521ebccf1e3SJoseph Koshy 522ebccf1e3SJoseph Koshy n = sizeof(pmc_debugstr); 523e829eb6dSJoseph Koshy newstr = malloc(n, M_PMC, M_WAITOK|M_ZERO); 524f263522aSJoseph Koshy (void) strlcpy(newstr, pmc_debugstr, n); 525ebccf1e3SJoseph Koshy 526ebccf1e3SJoseph Koshy error = sysctl_handle_string(oidp, newstr, n, req); 527ebccf1e3SJoseph Koshy 528ebccf1e3SJoseph Koshy /* if there is a new string, parse and copy it */ 529ebccf1e3SJoseph Koshy if (error == 0 && req->newptr != NULL) { 530f263522aSJoseph Koshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 531ebccf1e3SJoseph Koshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 532ebccf1e3SJoseph Koshy (void) strlcpy(pmc_debugstr, newstr, 533ebccf1e3SJoseph Koshy sizeof(pmc_debugstr)); 534ebccf1e3SJoseph Koshy } 535ebccf1e3SJoseph Koshy 5361ede983cSDag-Erling Smørgrav free(newstr, M_PMC); 537ebccf1e3SJoseph Koshy 538ebccf1e3SJoseph Koshy return error; 539ebccf1e3SJoseph Koshy } 540ebccf1e3SJoseph Koshy #endif 541ebccf1e3SJoseph Koshy 542ebccf1e3SJoseph Koshy /* 543e829eb6dSJoseph Koshy * Map a row index to a classdep structure and return the adjusted row 544e829eb6dSJoseph Koshy * index for the PMC class index. 545e829eb6dSJoseph Koshy */ 546e829eb6dSJoseph Koshy static struct pmc_classdep * 547e829eb6dSJoseph Koshy pmc_ri_to_classdep(struct pmc_mdep *md, int ri, int *adjri) 548e829eb6dSJoseph Koshy { 549e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 550e829eb6dSJoseph Koshy 551e829eb6dSJoseph Koshy (void) md; 552e829eb6dSJoseph Koshy 553e829eb6dSJoseph Koshy KASSERT(ri >= 0 && ri < md->pmd_npmc, 554e829eb6dSJoseph Koshy ("[pmc,%d] illegal row-index %d", __LINE__, ri)); 555e829eb6dSJoseph Koshy 556e829eb6dSJoseph Koshy pcd = pmc_rowindex_to_classdep[ri]; 557e829eb6dSJoseph Koshy 558e829eb6dSJoseph Koshy KASSERT(pcd != NULL, 559e5087dd8SRui Paulo ("[pmc,%d] ri %d null pcd", __LINE__, ri)); 560e829eb6dSJoseph Koshy 561e829eb6dSJoseph Koshy *adjri = ri - pcd->pcd_ri; 562e829eb6dSJoseph Koshy 563e829eb6dSJoseph Koshy KASSERT(*adjri >= 0 && *adjri < pcd->pcd_num, 564e829eb6dSJoseph Koshy ("[pmc,%d] adjusted row-index %d", __LINE__, *adjri)); 565e829eb6dSJoseph Koshy 566e829eb6dSJoseph Koshy return (pcd); 567e829eb6dSJoseph Koshy } 568e829eb6dSJoseph Koshy 569e829eb6dSJoseph Koshy /* 570ebccf1e3SJoseph Koshy * Concurrency Control 571ebccf1e3SJoseph Koshy * 572ebccf1e3SJoseph Koshy * The driver manages the following data structures: 573ebccf1e3SJoseph Koshy * 574ebccf1e3SJoseph Koshy * - target process descriptors, one per target process 575ebccf1e3SJoseph Koshy * - owner process descriptors (and attached lists), one per owner process 576ebccf1e3SJoseph Koshy * - lookup hash tables for owner and target processes 577ebccf1e3SJoseph Koshy * - PMC descriptors (and attached lists) 578ebccf1e3SJoseph Koshy * - per-cpu hardware state 579ebccf1e3SJoseph Koshy * - the 'hook' variable through which the kernel calls into 580ebccf1e3SJoseph Koshy * this module 581ebccf1e3SJoseph Koshy * - the machine hardware state (managed by the MD layer) 582ebccf1e3SJoseph Koshy * 583ebccf1e3SJoseph Koshy * These data structures are accessed from: 584ebccf1e3SJoseph Koshy * 585ebccf1e3SJoseph Koshy * - thread context-switch code 586ebccf1e3SJoseph Koshy * - interrupt handlers (possibly on multiple cpus) 587ebccf1e3SJoseph Koshy * - kernel threads on multiple cpus running on behalf of user 588ebccf1e3SJoseph Koshy * processes doing system calls 589ebccf1e3SJoseph Koshy * - this driver's private kernel threads 590ebccf1e3SJoseph Koshy * 591ebccf1e3SJoseph Koshy * = Locks and Locking strategy = 592ebccf1e3SJoseph Koshy * 593ebccf1e3SJoseph Koshy * The driver uses four locking strategies for its operation: 594ebccf1e3SJoseph Koshy * 595382d30cdSJoseph Koshy * - The global SX lock "pmc_sx" is used to protect internal 596382d30cdSJoseph Koshy * data structures. 597ebccf1e3SJoseph Koshy * 598382d30cdSJoseph Koshy * Calls into the module by syscall() start with this lock being 599382d30cdSJoseph Koshy * held in exclusive mode. Depending on the requested operation, 600382d30cdSJoseph Koshy * the lock may be downgraded to 'shared' mode to allow more 601382d30cdSJoseph Koshy * concurrent readers into the module. Calls into the module from 602382d30cdSJoseph Koshy * other parts of the kernel acquire the lock in shared mode. 603ebccf1e3SJoseph Koshy * 604ebccf1e3SJoseph Koshy * This SX lock is held in exclusive mode for any operations that 605ebccf1e3SJoseph Koshy * modify the linkages between the driver's internal data structures. 606ebccf1e3SJoseph Koshy * 607ebccf1e3SJoseph Koshy * The 'pmc_hook' function pointer is also protected by this lock. 608ebccf1e3SJoseph Koshy * It is only examined with the sx lock held in exclusive mode. The 609382d30cdSJoseph Koshy * kernel module is allowed to be unloaded only with the sx lock held 610382d30cdSJoseph Koshy * in exclusive mode. In normal syscall handling, after acquiring the 611382d30cdSJoseph Koshy * pmc_sx lock we first check that 'pmc_hook' is non-null before 612382d30cdSJoseph Koshy * proceeding. This prevents races between the thread unloading the module 613382d30cdSJoseph Koshy * and other threads seeking to use the module. 614ebccf1e3SJoseph Koshy * 615ebccf1e3SJoseph Koshy * - Lookups of target process structures and owner process structures 616ebccf1e3SJoseph Koshy * cannot use the global "pmc_sx" SX lock because these lookups need 617ebccf1e3SJoseph Koshy * to happen during context switches and in other critical sections 618ebccf1e3SJoseph Koshy * where sleeping is not allowed. We protect these lookup tables 619ebccf1e3SJoseph Koshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 620382d30cdSJoseph Koshy * "pmc_ownerhash_mtx". 621ebccf1e3SJoseph Koshy * 622ebccf1e3SJoseph Koshy * - Interrupt handlers work in a lock free manner. At interrupt 623ebccf1e3SJoseph Koshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 624ebccf1e3SJoseph Koshy * when the PMC was started. If this pointer is NULL, the interrupt 625ebccf1e3SJoseph Koshy * is ignored after updating driver statistics. We ensure that this 626ebccf1e3SJoseph Koshy * pointer is set (using an atomic operation if necessary) before the 627ebccf1e3SJoseph Koshy * PMC hardware is started. Conversely, this pointer is unset atomically 628ebccf1e3SJoseph Koshy * only after the PMC hardware is stopped. 629ebccf1e3SJoseph Koshy * 630ebccf1e3SJoseph Koshy * We ensure that everything needed for the operation of an 631ebccf1e3SJoseph Koshy * interrupt handler is available without it needing to acquire any 632ebccf1e3SJoseph Koshy * locks. We also ensure that a PMC's software state is destroyed only 633ebccf1e3SJoseph Koshy * after the PMC is taken off hardware (on all CPUs). 634ebccf1e3SJoseph Koshy * 635ebccf1e3SJoseph Koshy * - Context-switch handling with process-private PMCs needs more 636ebccf1e3SJoseph Koshy * care. 637ebccf1e3SJoseph Koshy * 638ebccf1e3SJoseph Koshy * A given process may be the target of multiple PMCs. For example, 639ebccf1e3SJoseph Koshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 640ebccf1e3SJoseph Koshy * while the target process is running on another. A PMC could also 641ebccf1e3SJoseph Koshy * be getting released because its owner is exiting. We tackle 642ebccf1e3SJoseph Koshy * these situations in the following manner: 643ebccf1e3SJoseph Koshy * 644ebccf1e3SJoseph Koshy * - each target process structure 'pmc_process' has an array 645ebccf1e3SJoseph Koshy * of 'struct pmc *' pointers, one for each hardware PMC. 646ebccf1e3SJoseph Koshy * 647ebccf1e3SJoseph Koshy * - At context switch IN time, each "target" PMC in RUNNING state 648ebccf1e3SJoseph Koshy * gets started on hardware and a pointer to each PMC is copied into 649ebccf1e3SJoseph Koshy * the per-cpu phw array. The 'runcount' for the PMC is 650ebccf1e3SJoseph Koshy * incremented. 651ebccf1e3SJoseph Koshy * 652ebccf1e3SJoseph Koshy * - At context switch OUT time, all process-virtual PMCs are stopped 653ebccf1e3SJoseph Koshy * on hardware. The saved value is added to the PMCs value field 654ebccf1e3SJoseph Koshy * only if the PMC is in a non-deleted state (the PMCs state could 655ebccf1e3SJoseph Koshy * have changed during the current time slice). 656ebccf1e3SJoseph Koshy * 657ebccf1e3SJoseph Koshy * Note that since in-between a switch IN on a processor and a switch 658ebccf1e3SJoseph Koshy * OUT, the PMC could have been released on another CPU. Therefore 659ebccf1e3SJoseph Koshy * context switch OUT always looks at the hardware state to turn 660ebccf1e3SJoseph Koshy * OFF PMCs and will update a PMC's saved value only if reachable 661ebccf1e3SJoseph Koshy * from the target process record. 662ebccf1e3SJoseph Koshy * 663ebccf1e3SJoseph Koshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 664ebccf1e3SJoseph Koshy * be attached to many processes at the time of the call and could 665ebccf1e3SJoseph Koshy * be active on multiple CPUs). 666ebccf1e3SJoseph Koshy * 667ebccf1e3SJoseph Koshy * We prevent further scheduling of the PMC by marking it as in 668ebccf1e3SJoseph Koshy * state 'DELETED'. If the runcount of the PMC is non-zero then 669ebccf1e3SJoseph Koshy * this PMC is currently running on a CPU somewhere. The thread 6704d70511aSJohn Baldwin * doing the PMCRELEASE operation waits by repeatedly doing a 6714d70511aSJohn Baldwin * pause() till the runcount comes to zero. 672ebccf1e3SJoseph Koshy * 673382d30cdSJoseph Koshy * The contents of a PMC descriptor (struct pmc) are protected using 674382d30cdSJoseph Koshy * a spin-mutex. In order to save space, we use a mutex pool. 675382d30cdSJoseph Koshy * 676382d30cdSJoseph Koshy * In terms of lock types used by witness(4), we use: 677382d30cdSJoseph Koshy * - Type "pmc-sx", used by the global SX lock. 678382d30cdSJoseph Koshy * - Type "pmc-sleep", for sleep mutexes used by logger threads. 679382d30cdSJoseph Koshy * - Type "pmc-per-proc", for protecting PMC owner descriptors. 680382d30cdSJoseph Koshy * - Type "pmc-leaf", used for all other spin mutexes. 681ebccf1e3SJoseph Koshy */ 682ebccf1e3SJoseph Koshy 683ebccf1e3SJoseph Koshy /* 684ebccf1e3SJoseph Koshy * save the cpu binding of the current kthread 685ebccf1e3SJoseph Koshy */ 686ebccf1e3SJoseph Koshy 687ebccf1e3SJoseph Koshy static void 688ebccf1e3SJoseph Koshy pmc_save_cpu_binding(struct pmc_binding *pb) 689ebccf1e3SJoseph Koshy { 6904a3690dfSJohn Baldwin PMCDBG0(CPU,BND,2, "save-cpu"); 691982d11f8SJeff Roberson thread_lock(curthread); 692ebccf1e3SJoseph Koshy pb->pb_bound = sched_is_bound(curthread); 693ebccf1e3SJoseph Koshy pb->pb_cpu = curthread->td_oncpu; 694982d11f8SJeff Roberson thread_unlock(curthread); 6954a3690dfSJohn Baldwin PMCDBG1(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 696ebccf1e3SJoseph Koshy } 697ebccf1e3SJoseph Koshy 698ebccf1e3SJoseph Koshy /* 699ebccf1e3SJoseph Koshy * restore the cpu binding of the current thread 700ebccf1e3SJoseph Koshy */ 701ebccf1e3SJoseph Koshy 702ebccf1e3SJoseph Koshy static void 703ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(struct pmc_binding *pb) 704ebccf1e3SJoseph Koshy { 7054a3690dfSJohn Baldwin PMCDBG2(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 706ebccf1e3SJoseph Koshy curthread->td_oncpu, pb->pb_cpu); 707982d11f8SJeff Roberson thread_lock(curthread); 708ebccf1e3SJoseph Koshy if (pb->pb_bound) 709ebccf1e3SJoseph Koshy sched_bind(curthread, pb->pb_cpu); 710ebccf1e3SJoseph Koshy else 711ebccf1e3SJoseph Koshy sched_unbind(curthread); 712982d11f8SJeff Roberson thread_unlock(curthread); 7134a3690dfSJohn Baldwin PMCDBG0(CPU,BND,2, "restore-cpu done"); 714ebccf1e3SJoseph Koshy } 715ebccf1e3SJoseph Koshy 716ebccf1e3SJoseph Koshy /* 717ebccf1e3SJoseph Koshy * move execution over the specified cpu and bind it there. 718ebccf1e3SJoseph Koshy */ 719ebccf1e3SJoseph Koshy 720ebccf1e3SJoseph Koshy static void 721ebccf1e3SJoseph Koshy pmc_select_cpu(int cpu) 722ebccf1e3SJoseph Koshy { 723122ccdc1SJoseph Koshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 724ebccf1e3SJoseph Koshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 725ebccf1e3SJoseph Koshy 726122ccdc1SJoseph Koshy /* Never move to an inactive CPU. */ 727122ccdc1SJoseph Koshy KASSERT(pmc_cpu_is_active(cpu), ("[pmc,%d] selecting inactive " 728122ccdc1SJoseph Koshy "CPU %d", __LINE__, cpu)); 729ebccf1e3SJoseph Koshy 7304a3690dfSJohn Baldwin PMCDBG1(CPU,SEL,2, "select-cpu cpu=%d", cpu); 731982d11f8SJeff Roberson thread_lock(curthread); 732ebccf1e3SJoseph Koshy sched_bind(curthread, cpu); 733982d11f8SJeff Roberson thread_unlock(curthread); 734ebccf1e3SJoseph Koshy 735ebccf1e3SJoseph Koshy KASSERT(curthread->td_oncpu == cpu, 736ebccf1e3SJoseph Koshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 737ebccf1e3SJoseph Koshy cpu, curthread->td_oncpu)); 738ebccf1e3SJoseph Koshy 7394a3690dfSJohn Baldwin PMCDBG1(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 740ebccf1e3SJoseph Koshy } 741ebccf1e3SJoseph Koshy 742ebccf1e3SJoseph Koshy /* 743c5153e19SJoseph Koshy * Force a context switch. 744c5153e19SJoseph Koshy * 7454d70511aSJohn Baldwin * We do this by pause'ing for 1 tick -- invoking mi_switch() is not 746c5153e19SJoseph Koshy * guaranteed to force a context switch. 747c5153e19SJoseph Koshy */ 748c5153e19SJoseph Koshy 749c5153e19SJoseph Koshy static void 750c5153e19SJoseph Koshy pmc_force_context_switch(void) 751c5153e19SJoseph Koshy { 752c5153e19SJoseph Koshy 7534d70511aSJohn Baldwin pause("pmcctx", 1); 754c5153e19SJoseph Koshy } 755c5153e19SJoseph Koshy 756c5153e19SJoseph Koshy /* 757f263522aSJoseph Koshy * Get the file name for an executable. This is a simple wrapper 758f263522aSJoseph Koshy * around vn_fullpath(9). 759ebccf1e3SJoseph Koshy */ 760ebccf1e3SJoseph Koshy 761f263522aSJoseph Koshy static void 76215139246SJoseph Koshy pmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 763ebccf1e3SJoseph Koshy { 764ebccf1e3SJoseph Koshy 765f263522aSJoseph Koshy *fullpath = "unknown"; 766f263522aSJoseph Koshy *freepath = NULL; 76722db15c0SAttilio Rao vn_fullpath(curthread, v, fullpath, freepath); 768ebccf1e3SJoseph Koshy } 769ebccf1e3SJoseph Koshy 770ebccf1e3SJoseph Koshy /* 771ebccf1e3SJoseph Koshy * remove an process owning PMCs 772ebccf1e3SJoseph Koshy */ 773ebccf1e3SJoseph Koshy 774ebccf1e3SJoseph Koshy void 775ebccf1e3SJoseph Koshy pmc_remove_owner(struct pmc_owner *po) 776ebccf1e3SJoseph Koshy { 777f263522aSJoseph Koshy struct pmc *pm, *tmp; 778ebccf1e3SJoseph Koshy 779ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 780ebccf1e3SJoseph Koshy 7814a3690dfSJohn Baldwin PMCDBG1(OWN,ORM,1, "remove-owner po=%p", po); 782ebccf1e3SJoseph Koshy 783ebccf1e3SJoseph Koshy /* Remove descriptor from the owner hash table */ 784ebccf1e3SJoseph Koshy LIST_REMOVE(po, po_next); 785ebccf1e3SJoseph Koshy 786f263522aSJoseph Koshy /* release all owned PMC descriptors */ 787f263522aSJoseph Koshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 7884a3690dfSJohn Baldwin PMCDBG1(OWN,ORM,2, "pmc=%p", pm); 789f263522aSJoseph Koshy KASSERT(pm->pm_owner == po, 790f263522aSJoseph Koshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 791ebccf1e3SJoseph Koshy 792f263522aSJoseph Koshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 79306796b67SMark Johnston pmc_destroy_pmc_descriptor(pm); 794ebccf1e3SJoseph Koshy } 795ebccf1e3SJoseph Koshy 796f263522aSJoseph Koshy KASSERT(po->po_sscount == 0, 797f263522aSJoseph Koshy ("[pmc,%d] SS count not zero", __LINE__)); 798ebccf1e3SJoseph Koshy KASSERT(LIST_EMPTY(&po->po_pmcs), 799ebccf1e3SJoseph Koshy ("[pmc,%d] PMC list not empty", __LINE__)); 800ebccf1e3SJoseph Koshy 801f263522aSJoseph Koshy /* de-configure the log file if present */ 802c5153e19SJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 803f263522aSJoseph Koshy pmclog_deconfigure_log(po); 804ebccf1e3SJoseph Koshy } 805ebccf1e3SJoseph Koshy 806ebccf1e3SJoseph Koshy /* 807ebccf1e3SJoseph Koshy * remove an owner process record if all conditions are met. 808ebccf1e3SJoseph Koshy */ 809ebccf1e3SJoseph Koshy 810ebccf1e3SJoseph Koshy static void 811ebccf1e3SJoseph Koshy pmc_maybe_remove_owner(struct pmc_owner *po) 812ebccf1e3SJoseph Koshy { 813ebccf1e3SJoseph Koshy 8144a3690dfSJohn Baldwin PMCDBG1(OWN,OMR,1, "maybe-remove-owner po=%p", po); 815ebccf1e3SJoseph Koshy 816ebccf1e3SJoseph Koshy /* 817ebccf1e3SJoseph Koshy * Remove owner record if 818ebccf1e3SJoseph Koshy * - this process does not own any PMCs 819ebccf1e3SJoseph Koshy * - this process has not allocated a system-wide sampling buffer 820ebccf1e3SJoseph Koshy */ 821ebccf1e3SJoseph Koshy 822ebccf1e3SJoseph Koshy if (LIST_EMPTY(&po->po_pmcs) && 823c5153e19SJoseph Koshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 824ebccf1e3SJoseph Koshy pmc_remove_owner(po); 825f263522aSJoseph Koshy pmc_destroy_owner_descriptor(po); 826ebccf1e3SJoseph Koshy } 827ebccf1e3SJoseph Koshy } 828ebccf1e3SJoseph Koshy 829ebccf1e3SJoseph Koshy /* 830ebccf1e3SJoseph Koshy * Add an association between a target process and a PMC. 831ebccf1e3SJoseph Koshy */ 832ebccf1e3SJoseph Koshy 833ebccf1e3SJoseph Koshy static void 834ebccf1e3SJoseph Koshy pmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 835ebccf1e3SJoseph Koshy { 836ebccf1e3SJoseph Koshy int ri; 837ebccf1e3SJoseph Koshy struct pmc_target *pt; 838ebccf1e3SJoseph Koshy 839ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 840ebccf1e3SJoseph Koshy 841ebccf1e3SJoseph Koshy KASSERT(pm != NULL && pp != NULL, 842ebccf1e3SJoseph Koshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 843f263522aSJoseph Koshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 844f263522aSJoseph Koshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 845f263522aSJoseph Koshy __LINE__, pm, pp->pp_proc->p_pid)); 846fa630f35SFabien Thomas KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= ((int) md->pmd_npmc - 1), 847ebccf1e3SJoseph Koshy ("[pmc,%d] Illegal reference count %d for process record %p", 848ebccf1e3SJoseph Koshy __LINE__, pp->pp_refcnt, (void *) pp)); 849ebccf1e3SJoseph Koshy 850c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 851ebccf1e3SJoseph Koshy 8524a3690dfSJohn Baldwin PMCDBG3(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 853ebccf1e3SJoseph Koshy pm, ri, pp); 854ebccf1e3SJoseph Koshy 855680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 856ebccf1e3SJoseph Koshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 857ebccf1e3SJoseph Koshy if (pt->pt_process == pp) 858ebccf1e3SJoseph Koshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 859ebccf1e3SJoseph Koshy __LINE__, pp, pm)); 860ebccf1e3SJoseph Koshy #endif 861ebccf1e3SJoseph Koshy 862e829eb6dSJoseph Koshy pt = malloc(sizeof(struct pmc_target), M_PMC, M_WAITOK|M_ZERO); 863ebccf1e3SJoseph Koshy pt->pt_process = pp; 864ebccf1e3SJoseph Koshy 865ebccf1e3SJoseph Koshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 866ebccf1e3SJoseph Koshy 867122eceefSJohn Baldwin atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 868122eceefSJohn Baldwin (uintptr_t)pm); 869ebccf1e3SJoseph Koshy 8706b8c8cd8SJoseph Koshy if (pm->pm_owner->po_owner == pp->pp_proc) 871c5153e19SJoseph Koshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 8726b8c8cd8SJoseph Koshy 873f263522aSJoseph Koshy /* 874f263522aSJoseph Koshy * Initialize the per-process values at this row index. 875f263522aSJoseph Koshy */ 876f263522aSJoseph Koshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 877f263522aSJoseph Koshy pm->pm_sc.pm_reloadcount : 0; 878f263522aSJoseph Koshy 879ebccf1e3SJoseph Koshy pp->pp_refcnt++; 880ebccf1e3SJoseph Koshy 881ebccf1e3SJoseph Koshy } 882ebccf1e3SJoseph Koshy 883ebccf1e3SJoseph Koshy /* 884ebccf1e3SJoseph Koshy * Removes the association between a target process and a PMC. 885ebccf1e3SJoseph Koshy */ 886ebccf1e3SJoseph Koshy 887ebccf1e3SJoseph Koshy static void 888ebccf1e3SJoseph Koshy pmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 889ebccf1e3SJoseph Koshy { 890ebccf1e3SJoseph Koshy int ri; 891f263522aSJoseph Koshy struct proc *p; 892ebccf1e3SJoseph Koshy struct pmc_target *ptgt; 893ebccf1e3SJoseph Koshy 894ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 895ebccf1e3SJoseph Koshy 896ebccf1e3SJoseph Koshy KASSERT(pm != NULL && pp != NULL, 897ebccf1e3SJoseph Koshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 898ebccf1e3SJoseph Koshy 899fa630f35SFabien Thomas KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt <= (int) md->pmd_npmc, 900ebccf1e3SJoseph Koshy ("[pmc,%d] Illegal ref count %d on process record %p", 901ebccf1e3SJoseph Koshy __LINE__, pp->pp_refcnt, (void *) pp)); 902ebccf1e3SJoseph Koshy 903c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 904ebccf1e3SJoseph Koshy 9054a3690dfSJohn Baldwin PMCDBG3(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 906ebccf1e3SJoseph Koshy pm, ri, pp); 907ebccf1e3SJoseph Koshy 908ebccf1e3SJoseph Koshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 909ebccf1e3SJoseph Koshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 910ebccf1e3SJoseph Koshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 911ebccf1e3SJoseph Koshy 912ebccf1e3SJoseph Koshy pp->pp_pmcs[ri].pp_pmc = NULL; 913ebccf1e3SJoseph Koshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 914ebccf1e3SJoseph Koshy 915c5153e19SJoseph Koshy /* Remove owner-specific flags */ 916c5153e19SJoseph Koshy if (pm->pm_owner->po_owner == pp->pp_proc) { 917c5153e19SJoseph Koshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 918c5153e19SJoseph Koshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 919c5153e19SJoseph Koshy } 9206b8c8cd8SJoseph Koshy 921ebccf1e3SJoseph Koshy pp->pp_refcnt--; 922ebccf1e3SJoseph Koshy 923ebccf1e3SJoseph Koshy /* Remove the target process from the PMC structure */ 924ebccf1e3SJoseph Koshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 925ebccf1e3SJoseph Koshy if (ptgt->pt_process == pp) 926ebccf1e3SJoseph Koshy break; 927ebccf1e3SJoseph Koshy 928ebccf1e3SJoseph Koshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 929ebccf1e3SJoseph Koshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 930ebccf1e3SJoseph Koshy 931ebccf1e3SJoseph Koshy LIST_REMOVE(ptgt, pt_next); 9321ede983cSDag-Erling Smørgrav free(ptgt, M_PMC); 933f263522aSJoseph Koshy 934f263522aSJoseph Koshy /* if the PMC now lacks targets, send the owner a SIGIO */ 935f263522aSJoseph Koshy if (LIST_EMPTY(&pm->pm_targets)) { 936f263522aSJoseph Koshy p = pm->pm_owner->po_owner; 937f263522aSJoseph Koshy PROC_LOCK(p); 9388451d0ddSKip Macy kern_psignal(p, SIGIO); 939f263522aSJoseph Koshy PROC_UNLOCK(p); 940f263522aSJoseph Koshy 9414a3690dfSJohn Baldwin PMCDBG2(PRC,SIG,2, "signalling proc=%p signal=%d", p, 942f263522aSJoseph Koshy SIGIO); 943ebccf1e3SJoseph Koshy } 944ebccf1e3SJoseph Koshy } 945ebccf1e3SJoseph Koshy 946ebccf1e3SJoseph Koshy /* 947ebccf1e3SJoseph Koshy * Check if PMC 'pm' may be attached to target process 't'. 948ebccf1e3SJoseph Koshy */ 949ebccf1e3SJoseph Koshy 950ebccf1e3SJoseph Koshy static int 951ebccf1e3SJoseph Koshy pmc_can_attach(struct pmc *pm, struct proc *t) 952ebccf1e3SJoseph Koshy { 953ebccf1e3SJoseph Koshy struct proc *o; /* pmc owner */ 954ebccf1e3SJoseph Koshy struct ucred *oc, *tc; /* owner, target credentials */ 955ebccf1e3SJoseph Koshy int decline_attach, i; 956ebccf1e3SJoseph Koshy 957ebccf1e3SJoseph Koshy /* 958ebccf1e3SJoseph Koshy * A PMC's owner can always attach that PMC to itself. 959ebccf1e3SJoseph Koshy */ 960ebccf1e3SJoseph Koshy 961ebccf1e3SJoseph Koshy if ((o = pm->pm_owner->po_owner) == t) 962ebccf1e3SJoseph Koshy return 0; 963ebccf1e3SJoseph Koshy 964ebccf1e3SJoseph Koshy PROC_LOCK(o); 965ebccf1e3SJoseph Koshy oc = o->p_ucred; 966ebccf1e3SJoseph Koshy crhold(oc); 967ebccf1e3SJoseph Koshy PROC_UNLOCK(o); 968ebccf1e3SJoseph Koshy 969ebccf1e3SJoseph Koshy PROC_LOCK(t); 970ebccf1e3SJoseph Koshy tc = t->p_ucred; 971ebccf1e3SJoseph Koshy crhold(tc); 972ebccf1e3SJoseph Koshy PROC_UNLOCK(t); 973ebccf1e3SJoseph Koshy 974ebccf1e3SJoseph Koshy /* 975ebccf1e3SJoseph Koshy * The effective uid of the PMC owner should match at least one 976ebccf1e3SJoseph Koshy * of the {effective,real,saved} uids of the target process. 977ebccf1e3SJoseph Koshy */ 978ebccf1e3SJoseph Koshy 979ebccf1e3SJoseph Koshy decline_attach = oc->cr_uid != tc->cr_uid && 980ebccf1e3SJoseph Koshy oc->cr_uid != tc->cr_svuid && 981ebccf1e3SJoseph Koshy oc->cr_uid != tc->cr_ruid; 982ebccf1e3SJoseph Koshy 983ebccf1e3SJoseph Koshy /* 984ebccf1e3SJoseph Koshy * Every one of the target's group ids, must be in the owner's 985ebccf1e3SJoseph Koshy * group list. 986ebccf1e3SJoseph Koshy */ 987ebccf1e3SJoseph Koshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 988ebccf1e3SJoseph Koshy decline_attach = !groupmember(tc->cr_groups[i], oc); 989ebccf1e3SJoseph Koshy 990ebccf1e3SJoseph Koshy /* check the read and saved gids too */ 991ebccf1e3SJoseph Koshy if (decline_attach == 0) 992ebccf1e3SJoseph Koshy decline_attach = !groupmember(tc->cr_rgid, oc) || 993ebccf1e3SJoseph Koshy !groupmember(tc->cr_svgid, oc); 994ebccf1e3SJoseph Koshy 995ebccf1e3SJoseph Koshy crfree(tc); 996ebccf1e3SJoseph Koshy crfree(oc); 997ebccf1e3SJoseph Koshy 998ebccf1e3SJoseph Koshy return !decline_attach; 999ebccf1e3SJoseph Koshy } 1000ebccf1e3SJoseph Koshy 1001ebccf1e3SJoseph Koshy /* 1002ebccf1e3SJoseph Koshy * Attach a process to a PMC. 1003ebccf1e3SJoseph Koshy */ 1004ebccf1e3SJoseph Koshy 1005ebccf1e3SJoseph Koshy static int 1006ebccf1e3SJoseph Koshy pmc_attach_one_process(struct proc *p, struct pmc *pm) 1007ebccf1e3SJoseph Koshy { 1008ebccf1e3SJoseph Koshy int ri; 1009f263522aSJoseph Koshy char *fullpath, *freepath; 1010ebccf1e3SJoseph Koshy struct pmc_process *pp; 1011ebccf1e3SJoseph Koshy 1012ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1013ebccf1e3SJoseph Koshy 10144a3690dfSJohn Baldwin PMCDBG5(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 1015c5153e19SJoseph Koshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1016ebccf1e3SJoseph Koshy 1017ebccf1e3SJoseph Koshy /* 1018ebccf1e3SJoseph Koshy * Locate the process descriptor corresponding to process 'p', 1019ebccf1e3SJoseph Koshy * allocating space as needed. 1020ebccf1e3SJoseph Koshy * 1021ebccf1e3SJoseph Koshy * Verify that rowindex 'pm_rowindex' is free in the process 1022ebccf1e3SJoseph Koshy * descriptor. 1023ebccf1e3SJoseph Koshy * 1024ebccf1e3SJoseph Koshy * If not, allocate space for a descriptor and link the 1025ebccf1e3SJoseph Koshy * process descriptor and PMC. 1026ebccf1e3SJoseph Koshy */ 1027c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 1028ebccf1e3SJoseph Koshy 1029ebccf1e3SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 1030ebccf1e3SJoseph Koshy return ENOMEM; 1031ebccf1e3SJoseph Koshy 1032ebccf1e3SJoseph Koshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 1033ebccf1e3SJoseph Koshy return EEXIST; 1034ebccf1e3SJoseph Koshy 1035ebccf1e3SJoseph Koshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 1036ebccf1e3SJoseph Koshy return EBUSY; 1037ebccf1e3SJoseph Koshy 1038ebccf1e3SJoseph Koshy pmc_link_target_process(pm, pp); 1039ebccf1e3SJoseph Koshy 1040f263522aSJoseph Koshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 1041f263522aSJoseph Koshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 1042f263522aSJoseph Koshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 1043f263522aSJoseph Koshy 1044f263522aSJoseph Koshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 1045f263522aSJoseph Koshy 1046f263522aSJoseph Koshy /* issue an attach event to a configured log file */ 1047f263522aSJoseph Koshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 1048db57c70aSKonstantin Belousov if (p->p_flag & P_KPROC) { 1049d67023a1SJeff Roberson fullpath = kernelname; 1050d67023a1SJeff Roberson freepath = NULL; 10510fb2c5d6SKonstantin Belousov } else { 10520fb2c5d6SKonstantin Belousov pmc_getfilename(p->p_textvp, &fullpath, &freepath); 1053f263522aSJoseph Koshy pmclog_process_pmcattach(pm, p->p_pid, fullpath); 10540fb2c5d6SKonstantin Belousov } 10551ede983cSDag-Erling Smørgrav free(freepath, M_TEMP); 1056d07f36b0SJoseph Koshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 1057d07f36b0SJoseph Koshy pmc_log_process_mappings(pm->pm_owner, p); 1058f263522aSJoseph Koshy } 1059ebccf1e3SJoseph Koshy /* mark process as using HWPMCs */ 1060ebccf1e3SJoseph Koshy PROC_LOCK(p); 1061ebccf1e3SJoseph Koshy p->p_flag |= P_HWPMC; 1062ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 1063ebccf1e3SJoseph Koshy 1064ebccf1e3SJoseph Koshy return 0; 1065ebccf1e3SJoseph Koshy } 1066ebccf1e3SJoseph Koshy 1067ebccf1e3SJoseph Koshy /* 1068ebccf1e3SJoseph Koshy * Attach a process and optionally its children 1069ebccf1e3SJoseph Koshy */ 1070ebccf1e3SJoseph Koshy 1071ebccf1e3SJoseph Koshy static int 1072ebccf1e3SJoseph Koshy pmc_attach_process(struct proc *p, struct pmc *pm) 1073ebccf1e3SJoseph Koshy { 1074ebccf1e3SJoseph Koshy int error; 1075ebccf1e3SJoseph Koshy struct proc *top; 1076ebccf1e3SJoseph Koshy 1077ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1078ebccf1e3SJoseph Koshy 10794a3690dfSJohn Baldwin PMCDBG5(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 1080c5153e19SJoseph Koshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1081c5153e19SJoseph Koshy 1082c5153e19SJoseph Koshy 1083c5153e19SJoseph Koshy /* 1084c5153e19SJoseph Koshy * If this PMC successfully allowed a GETMSR operation 1085c5153e19SJoseph Koshy * in the past, disallow further ATTACHes. 1086c5153e19SJoseph Koshy */ 1087c5153e19SJoseph Koshy 1088c5153e19SJoseph Koshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 1089c5153e19SJoseph Koshy return EPERM; 1090ebccf1e3SJoseph Koshy 1091ebccf1e3SJoseph Koshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1092ebccf1e3SJoseph Koshy return pmc_attach_one_process(p, pm); 1093ebccf1e3SJoseph Koshy 1094ebccf1e3SJoseph Koshy /* 1095ebccf1e3SJoseph Koshy * Traverse all child processes, attaching them to 1096ebccf1e3SJoseph Koshy * this PMC. 1097ebccf1e3SJoseph Koshy */ 1098ebccf1e3SJoseph Koshy 1099ebccf1e3SJoseph Koshy sx_slock(&proctree_lock); 1100ebccf1e3SJoseph Koshy 1101ebccf1e3SJoseph Koshy top = p; 1102ebccf1e3SJoseph Koshy 1103ebccf1e3SJoseph Koshy for (;;) { 1104ebccf1e3SJoseph Koshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1105ebccf1e3SJoseph Koshy break; 1106ebccf1e3SJoseph Koshy if (!LIST_EMPTY(&p->p_children)) 1107ebccf1e3SJoseph Koshy p = LIST_FIRST(&p->p_children); 1108ebccf1e3SJoseph Koshy else for (;;) { 1109ebccf1e3SJoseph Koshy if (p == top) 1110ebccf1e3SJoseph Koshy goto done; 1111ebccf1e3SJoseph Koshy if (LIST_NEXT(p, p_sibling)) { 1112ebccf1e3SJoseph Koshy p = LIST_NEXT(p, p_sibling); 1113ebccf1e3SJoseph Koshy break; 1114ebccf1e3SJoseph Koshy } 1115ebccf1e3SJoseph Koshy p = p->p_pptr; 1116ebccf1e3SJoseph Koshy } 1117ebccf1e3SJoseph Koshy } 1118ebccf1e3SJoseph Koshy 1119ebccf1e3SJoseph Koshy if (error) 1120ebccf1e3SJoseph Koshy (void) pmc_detach_process(top, pm); 1121ebccf1e3SJoseph Koshy 1122ebccf1e3SJoseph Koshy done: 1123ebccf1e3SJoseph Koshy sx_sunlock(&proctree_lock); 1124ebccf1e3SJoseph Koshy return error; 1125ebccf1e3SJoseph Koshy } 1126ebccf1e3SJoseph Koshy 1127ebccf1e3SJoseph Koshy /* 1128ebccf1e3SJoseph Koshy * Detach a process from a PMC. If there are no other PMCs tracking 1129ebccf1e3SJoseph Koshy * this process, remove the process structure from its hash table. If 1130ebccf1e3SJoseph Koshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1131ebccf1e3SJoseph Koshy */ 1132ebccf1e3SJoseph Koshy 1133ebccf1e3SJoseph Koshy static int 1134ebccf1e3SJoseph Koshy pmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1135ebccf1e3SJoseph Koshy { 1136ebccf1e3SJoseph Koshy int ri; 1137ebccf1e3SJoseph Koshy struct pmc_process *pp; 1138ebccf1e3SJoseph Koshy 1139ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1140ebccf1e3SJoseph Koshy 1141ebccf1e3SJoseph Koshy KASSERT(pm != NULL, 1142ebccf1e3SJoseph Koshy ("[pmc,%d] null pm pointer", __LINE__)); 1143ebccf1e3SJoseph Koshy 1144c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 1145ebccf1e3SJoseph Koshy 11464a3690dfSJohn Baldwin PMCDBG6(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1147c5153e19SJoseph Koshy pm, ri, p, p->p_pid, p->p_comm, flags); 1148ebccf1e3SJoseph Koshy 1149ebccf1e3SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1150ebccf1e3SJoseph Koshy return ESRCH; 1151ebccf1e3SJoseph Koshy 1152ebccf1e3SJoseph Koshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1153ebccf1e3SJoseph Koshy return EINVAL; 1154ebccf1e3SJoseph Koshy 1155ebccf1e3SJoseph Koshy pmc_unlink_target_process(pm, pp); 1156ebccf1e3SJoseph Koshy 1157f263522aSJoseph Koshy /* Issue a detach entry if a log file is configured */ 1158f263522aSJoseph Koshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1159f263522aSJoseph Koshy pmclog_process_pmcdetach(pm, p->p_pid); 1160f263522aSJoseph Koshy 1161ebccf1e3SJoseph Koshy /* 1162b790c193SPedro F. Giffuni * If there are no PMCs targeting this process, we remove its 1163ebccf1e3SJoseph Koshy * descriptor from the target hash table and unset the P_HWPMC 1164ebccf1e3SJoseph Koshy * flag in the struct proc. 1165ebccf1e3SJoseph Koshy */ 1166fa630f35SFabien Thomas KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc, 1167ebccf1e3SJoseph Koshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1168ebccf1e3SJoseph Koshy __LINE__, pp->pp_refcnt, pp)); 1169ebccf1e3SJoseph Koshy 1170ebccf1e3SJoseph Koshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1171ebccf1e3SJoseph Koshy return 0; 1172ebccf1e3SJoseph Koshy 1173ebccf1e3SJoseph Koshy pmc_remove_process_descriptor(pp); 1174ebccf1e3SJoseph Koshy 1175ebccf1e3SJoseph Koshy if (flags & PMC_FLAG_REMOVE) 11761ede983cSDag-Erling Smørgrav free(pp, M_PMC); 1177ebccf1e3SJoseph Koshy 1178ebccf1e3SJoseph Koshy PROC_LOCK(p); 1179ebccf1e3SJoseph Koshy p->p_flag &= ~P_HWPMC; 1180ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 1181ebccf1e3SJoseph Koshy 1182ebccf1e3SJoseph Koshy return 0; 1183ebccf1e3SJoseph Koshy } 1184ebccf1e3SJoseph Koshy 1185ebccf1e3SJoseph Koshy /* 1186ebccf1e3SJoseph Koshy * Detach a process and optionally its descendants from a PMC. 1187ebccf1e3SJoseph Koshy */ 1188ebccf1e3SJoseph Koshy 1189ebccf1e3SJoseph Koshy static int 1190ebccf1e3SJoseph Koshy pmc_detach_process(struct proc *p, struct pmc *pm) 1191ebccf1e3SJoseph Koshy { 1192ebccf1e3SJoseph Koshy struct proc *top; 1193ebccf1e3SJoseph Koshy 1194ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1195ebccf1e3SJoseph Koshy 11964a3690dfSJohn Baldwin PMCDBG5(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1197c5153e19SJoseph Koshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1198ebccf1e3SJoseph Koshy 1199ebccf1e3SJoseph Koshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1200ebccf1e3SJoseph Koshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1201ebccf1e3SJoseph Koshy 1202ebccf1e3SJoseph Koshy /* 1203ebccf1e3SJoseph Koshy * Traverse all children, detaching them from this PMC. We 1204ebccf1e3SJoseph Koshy * ignore errors since we could be detaching a PMC from a 1205ebccf1e3SJoseph Koshy * partially attached proc tree. 1206ebccf1e3SJoseph Koshy */ 1207ebccf1e3SJoseph Koshy 1208ebccf1e3SJoseph Koshy sx_slock(&proctree_lock); 1209ebccf1e3SJoseph Koshy 1210ebccf1e3SJoseph Koshy top = p; 1211ebccf1e3SJoseph Koshy 1212ebccf1e3SJoseph Koshy for (;;) { 1213ebccf1e3SJoseph Koshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1214ebccf1e3SJoseph Koshy 1215ebccf1e3SJoseph Koshy if (!LIST_EMPTY(&p->p_children)) 1216ebccf1e3SJoseph Koshy p = LIST_FIRST(&p->p_children); 1217ebccf1e3SJoseph Koshy else for (;;) { 1218ebccf1e3SJoseph Koshy if (p == top) 1219ebccf1e3SJoseph Koshy goto done; 1220ebccf1e3SJoseph Koshy if (LIST_NEXT(p, p_sibling)) { 1221ebccf1e3SJoseph Koshy p = LIST_NEXT(p, p_sibling); 1222ebccf1e3SJoseph Koshy break; 1223ebccf1e3SJoseph Koshy } 1224ebccf1e3SJoseph Koshy p = p->p_pptr; 1225ebccf1e3SJoseph Koshy } 1226ebccf1e3SJoseph Koshy } 1227ebccf1e3SJoseph Koshy 1228ebccf1e3SJoseph Koshy done: 1229ebccf1e3SJoseph Koshy sx_sunlock(&proctree_lock); 1230f263522aSJoseph Koshy 1231f263522aSJoseph Koshy if (LIST_EMPTY(&pm->pm_targets)) 1232f263522aSJoseph Koshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1233f263522aSJoseph Koshy 1234ebccf1e3SJoseph Koshy return 0; 1235ebccf1e3SJoseph Koshy } 1236ebccf1e3SJoseph Koshy 1237ebccf1e3SJoseph Koshy 1238ebccf1e3SJoseph Koshy /* 1239ebccf1e3SJoseph Koshy * Thread context switch IN 1240ebccf1e3SJoseph Koshy */ 1241ebccf1e3SJoseph Koshy 1242f263522aSJoseph Koshy static void 1243f263522aSJoseph Koshy pmc_process_csw_in(struct thread *td) 1244ebccf1e3SJoseph Koshy { 1245ebccf1e3SJoseph Koshy int cpu; 1246e829eb6dSJoseph Koshy unsigned int adjri, ri; 1247ebccf1e3SJoseph Koshy struct pmc *pm; 1248ebccf1e3SJoseph Koshy struct proc *p; 1249ebccf1e3SJoseph Koshy struct pmc_cpu *pc; 1250ebccf1e3SJoseph Koshy struct pmc_hw *phw; 1251ebccf1e3SJoseph Koshy pmc_value_t newvalue; 1252e829eb6dSJoseph Koshy struct pmc_process *pp; 1253e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 1254ebccf1e3SJoseph Koshy 1255ebccf1e3SJoseph Koshy p = td->td_proc; 1256ebccf1e3SJoseph Koshy 1257ebccf1e3SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1258f263522aSJoseph Koshy return; 1259ebccf1e3SJoseph Koshy 1260ebccf1e3SJoseph Koshy KASSERT(pp->pp_proc == td->td_proc, 1261ebccf1e3SJoseph Koshy ("[pmc,%d] not my thread state", __LINE__)); 1262ebccf1e3SJoseph Koshy 1263f263522aSJoseph Koshy critical_enter(); /* no preemption from this point */ 1264ebccf1e3SJoseph Koshy 1265ebccf1e3SJoseph Koshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1266ebccf1e3SJoseph Koshy 12674a3690dfSJohn Baldwin PMCDBG5(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1268ebccf1e3SJoseph Koshy p->p_pid, p->p_comm, pp); 1269ebccf1e3SJoseph Koshy 1270122ccdc1SJoseph Koshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1271b790c193SPedro F. Giffuni ("[pmc,%d] weird CPU id %d", __LINE__, cpu)); 1272ebccf1e3SJoseph Koshy 1273ebccf1e3SJoseph Koshy pc = pmc_pcpu[cpu]; 1274ebccf1e3SJoseph Koshy 1275ebccf1e3SJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1276ebccf1e3SJoseph Koshy 1277ebccf1e3SJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1278ebccf1e3SJoseph Koshy continue; 1279ebccf1e3SJoseph Koshy 1280c5153e19SJoseph Koshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1281ebccf1e3SJoseph Koshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1282c5153e19SJoseph Koshy __LINE__, PMC_TO_MODE(pm))); 1283ebccf1e3SJoseph Koshy 1284c5153e19SJoseph Koshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1285ebccf1e3SJoseph Koshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1286c5153e19SJoseph Koshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1287ebccf1e3SJoseph Koshy 1288ebccf1e3SJoseph Koshy /* 1289ebccf1e3SJoseph Koshy * Only PMCs that are marked as 'RUNNING' need 1290ebccf1e3SJoseph Koshy * be placed on hardware. 1291ebccf1e3SJoseph Koshy */ 1292ebccf1e3SJoseph Koshy 1293ebccf1e3SJoseph Koshy if (pm->pm_state != PMC_STATE_RUNNING) 1294ebccf1e3SJoseph Koshy continue; 1295ebccf1e3SJoseph Koshy 1296ebccf1e3SJoseph Koshy /* increment PMC runcount */ 1297e6b475e0SMatt Macy counter_u64_add(pm->pm_runcount, 1); 1298ebccf1e3SJoseph Koshy 1299ebccf1e3SJoseph Koshy /* configure the HWPMC we are going to use. */ 1300e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1301e829eb6dSJoseph Koshy pcd->pcd_config_pmc(cpu, adjri, pm); 1302ebccf1e3SJoseph Koshy 1303ebccf1e3SJoseph Koshy phw = pc->pc_hwpmcs[ri]; 1304ebccf1e3SJoseph Koshy 1305ebccf1e3SJoseph Koshy KASSERT(phw != NULL, 1306ebccf1e3SJoseph Koshy ("[pmc,%d] null hw pointer", __LINE__)); 1307ebccf1e3SJoseph Koshy 1308ebccf1e3SJoseph Koshy KASSERT(phw->phw_pmc == pm, 1309ebccf1e3SJoseph Koshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1310ebccf1e3SJoseph Koshy phw->phw_pmc, pm)); 1311ebccf1e3SJoseph Koshy 1312f263522aSJoseph Koshy /* 1313f263522aSJoseph Koshy * Write out saved value and start the PMC. 1314f263522aSJoseph Koshy * 1315f263522aSJoseph Koshy * Sampling PMCs use a per-process value, while 1316f263522aSJoseph Koshy * counting mode PMCs use a per-pmc value that is 1317f263522aSJoseph Koshy * inherited across descendants. 1318f263522aSJoseph Koshy */ 1319f263522aSJoseph Koshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1320f263522aSJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 13215eaa6f01SJonathan T. Looney 13225eaa6f01SJonathan T. Looney /* 13235eaa6f01SJonathan T. Looney * Use the saved value calculated after the most recent 13245eaa6f01SJonathan T. Looney * thread switch out to start this counter. Reset 13255eaa6f01SJonathan T. Looney * the saved count in case another thread from this 13265eaa6f01SJonathan T. Looney * process switches in before any threads switch out. 13275eaa6f01SJonathan T. Looney */ 1328f263522aSJoseph Koshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1329f263522aSJoseph Koshy pp->pp_pmcs[ri].pp_pmcval; 13305eaa6f01SJonathan T. Looney pp->pp_pmcs[ri].pp_pmcval = pm->pm_sc.pm_reloadcount; 1331f263522aSJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1332f263522aSJoseph Koshy } else { 1333f263522aSJoseph Koshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1334f263522aSJoseph Koshy ("[pmc,%d] illegal mode=%d", __LINE__, 1335f263522aSJoseph Koshy PMC_TO_MODE(pm))); 1336ebccf1e3SJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1337ebccf1e3SJoseph Koshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1338ebccf1e3SJoseph Koshy pm->pm_gv.pm_savedvalue; 1339ebccf1e3SJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1340f263522aSJoseph Koshy } 1341f263522aSJoseph Koshy 13424a3690dfSJohn Baldwin PMCDBG3(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1343ebccf1e3SJoseph Koshy 1344e829eb6dSJoseph Koshy pcd->pcd_write_pmc(cpu, adjri, newvalue); 1345a3924968SJonathan T. Looney 1346a3924968SJonathan T. Looney /* If a sampling mode PMC, reset stalled state. */ 1347a3924968SJonathan T. Looney if (PMC_TO_MODE(pm) == PMC_MODE_TS) 1348e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_stalled = 0; 1349a3924968SJonathan T. Looney 1350a3924968SJonathan T. Looney /* Indicate that we desire this to run. */ 1351e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_cpustate = 1; 1352a3924968SJonathan T. Looney 1353a3924968SJonathan T. Looney /* Start the PMC. */ 1354e829eb6dSJoseph Koshy pcd->pcd_start_pmc(cpu, adjri); 1355ebccf1e3SJoseph Koshy } 1356ebccf1e3SJoseph Koshy 1357ebccf1e3SJoseph Koshy /* 1358ebccf1e3SJoseph Koshy * perform any other architecture/cpu dependent thread 1359ebccf1e3SJoseph Koshy * switch-in actions. 1360ebccf1e3SJoseph Koshy */ 1361ebccf1e3SJoseph Koshy 13626b8c8cd8SJoseph Koshy (void) (*md->pmd_switch_in)(pc, pp); 1363ebccf1e3SJoseph Koshy 1364ebccf1e3SJoseph Koshy critical_exit(); 1365ebccf1e3SJoseph Koshy 1366ebccf1e3SJoseph Koshy } 1367ebccf1e3SJoseph Koshy 1368ebccf1e3SJoseph Koshy /* 1369ebccf1e3SJoseph Koshy * Thread context switch OUT. 1370ebccf1e3SJoseph Koshy */ 1371ebccf1e3SJoseph Koshy 1372f263522aSJoseph Koshy static void 1373f263522aSJoseph Koshy pmc_process_csw_out(struct thread *td) 1374ebccf1e3SJoseph Koshy { 1375ebccf1e3SJoseph Koshy int cpu; 1376e829eb6dSJoseph Koshy int64_t tmp; 1377ebccf1e3SJoseph Koshy struct pmc *pm; 1378ebccf1e3SJoseph Koshy struct proc *p; 1379e829eb6dSJoseph Koshy enum pmc_mode mode; 1380ebccf1e3SJoseph Koshy struct pmc_cpu *pc; 1381f263522aSJoseph Koshy pmc_value_t newvalue; 1382e829eb6dSJoseph Koshy unsigned int adjri, ri; 1383e829eb6dSJoseph Koshy struct pmc_process *pp; 1384e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 1385e829eb6dSJoseph Koshy 1386ebccf1e3SJoseph Koshy 1387ebccf1e3SJoseph Koshy /* 1388ebccf1e3SJoseph Koshy * Locate our process descriptor; this may be NULL if 1389ebccf1e3SJoseph Koshy * this process is exiting and we have already removed 1390ebccf1e3SJoseph Koshy * the process from the target process table. 1391ebccf1e3SJoseph Koshy * 1392ebccf1e3SJoseph Koshy * Note that due to kernel preemption, multiple 1393ebccf1e3SJoseph Koshy * context switches may happen while the process is 1394ebccf1e3SJoseph Koshy * exiting. 1395ebccf1e3SJoseph Koshy * 1396ebccf1e3SJoseph Koshy * Note also that if the target process cannot be 1397ebccf1e3SJoseph Koshy * found we still need to deconfigure any PMCs that 1398ebccf1e3SJoseph Koshy * are currently running on hardware. 1399ebccf1e3SJoseph Koshy */ 1400ebccf1e3SJoseph Koshy 1401ebccf1e3SJoseph Koshy p = td->td_proc; 1402ebccf1e3SJoseph Koshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1403ebccf1e3SJoseph Koshy 1404ebccf1e3SJoseph Koshy /* 1405ebccf1e3SJoseph Koshy * save PMCs 1406ebccf1e3SJoseph Koshy */ 1407ebccf1e3SJoseph Koshy 1408ebccf1e3SJoseph Koshy critical_enter(); 1409ebccf1e3SJoseph Koshy 1410ebccf1e3SJoseph Koshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1411ebccf1e3SJoseph Koshy 14124a3690dfSJohn Baldwin PMCDBG5(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1413ebccf1e3SJoseph Koshy p->p_pid, p->p_comm, pp); 1414ebccf1e3SJoseph Koshy 1415122ccdc1SJoseph Koshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 1416b790c193SPedro F. Giffuni ("[pmc,%d weird CPU id %d", __LINE__, cpu)); 1417ebccf1e3SJoseph Koshy 1418ebccf1e3SJoseph Koshy pc = pmc_pcpu[cpu]; 1419ebccf1e3SJoseph Koshy 1420ebccf1e3SJoseph Koshy /* 1421ebccf1e3SJoseph Koshy * When a PMC gets unlinked from a target PMC, it will 1422ebccf1e3SJoseph Koshy * be removed from the target's pp_pmc[] array. 1423ebccf1e3SJoseph Koshy * 1424ebccf1e3SJoseph Koshy * However, on a MP system, the target could have been 1425ebccf1e3SJoseph Koshy * executing on another CPU at the time of the unlink. 1426ebccf1e3SJoseph Koshy * So, at context switch OUT time, we need to look at 1427ebccf1e3SJoseph Koshy * the hardware to determine if a PMC is scheduled on 1428ebccf1e3SJoseph Koshy * it. 1429ebccf1e3SJoseph Koshy */ 1430ebccf1e3SJoseph Koshy 1431ebccf1e3SJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1432ebccf1e3SJoseph Koshy 1433e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 1434c5153e19SJoseph Koshy pm = NULL; 1435e829eb6dSJoseph Koshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 1436ebccf1e3SJoseph Koshy 1437ebccf1e3SJoseph Koshy if (pm == NULL) /* nothing at this row index */ 1438ebccf1e3SJoseph Koshy continue; 1439ebccf1e3SJoseph Koshy 1440f263522aSJoseph Koshy mode = PMC_TO_MODE(pm); 1441f263522aSJoseph Koshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1442ebccf1e3SJoseph Koshy continue; /* not a process virtual PMC */ 1443ebccf1e3SJoseph Koshy 1444c5153e19SJoseph Koshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1445ebccf1e3SJoseph Koshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1446c5153e19SJoseph Koshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1447ebccf1e3SJoseph Koshy 1448a3924968SJonathan T. Looney /* 1449a3924968SJonathan T. Looney * Change desired state, and then stop if not stalled. 1450a3924968SJonathan T. Looney * This two-step dance should avoid race conditions where 1451a3924968SJonathan T. Looney * an interrupt re-enables the PMC after this code has 1452a3924968SJonathan T. Looney * already checked the pm_stalled flag. 1453a3924968SJonathan T. Looney */ 1454e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_cpustate = 0; 1455e6b475e0SMatt Macy if (pm->pm_pcpu_state[cpu].pps_stalled == 0) 1456e829eb6dSJoseph Koshy pcd->pcd_stop_pmc(cpu, adjri); 1457ebccf1e3SJoseph Koshy 1458ebccf1e3SJoseph Koshy /* reduce this PMC's runcount */ 1459e6b475e0SMatt Macy counter_u64_add(pm->pm_runcount, -1); 1460ebccf1e3SJoseph Koshy 1461ebccf1e3SJoseph Koshy /* 1462ebccf1e3SJoseph Koshy * If this PMC is associated with this process, 1463ebccf1e3SJoseph Koshy * save the reading. 1464ebccf1e3SJoseph Koshy */ 1465ebccf1e3SJoseph Koshy 1466593077d6SAndriy Gapon if (pm->pm_state != PMC_STATE_DELETED && pp != NULL && 1467593077d6SAndriy Gapon pp->pp_pmcs[ri].pp_pmc != NULL) { 1468ebccf1e3SJoseph Koshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1469f263522aSJoseph Koshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1470f263522aSJoseph Koshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1471ebccf1e3SJoseph Koshy 1472ebccf1e3SJoseph Koshy KASSERT(pp->pp_refcnt > 0, 1473ebccf1e3SJoseph Koshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1474ebccf1e3SJoseph Koshy pp->pp_refcnt)); 1475ebccf1e3SJoseph Koshy 1476e829eb6dSJoseph Koshy pcd->pcd_read_pmc(cpu, adjri, &newvalue); 1477ebccf1e3SJoseph Koshy 1478f263522aSJoseph Koshy if (mode == PMC_MODE_TS) { 14795eaa6f01SJonathan T. Looney PMCDBG3(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd (samp)", 14805eaa6f01SJonathan T. Looney cpu, ri, PMC_PCPU_SAVED(cpu,ri) - newvalue); 1481f263522aSJoseph Koshy 1482f263522aSJoseph Koshy /* 1483f263522aSJoseph Koshy * For sampling process-virtual PMCs, 14845eaa6f01SJonathan T. Looney * newvalue is the number of events to be seen 14855eaa6f01SJonathan T. Looney * until the next sampling interrupt. 14865eaa6f01SJonathan T. Looney * We can just add the events left from this 14875eaa6f01SJonathan T. Looney * invocation to the counter, then adjust 14885eaa6f01SJonathan T. Looney * in case we overflow our range. 14895eaa6f01SJonathan T. Looney * 14905eaa6f01SJonathan T. Looney * (Recall that we reload the counter every 14915eaa6f01SJonathan T. Looney * time we use it.) 1492f263522aSJoseph Koshy */ 1493f263522aSJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 14945eaa6f01SJonathan T. Looney 14955eaa6f01SJonathan T. Looney pp->pp_pmcs[ri].pp_pmcval += newvalue; 14965eaa6f01SJonathan T. Looney if (pp->pp_pmcs[ri].pp_pmcval > 14975eaa6f01SJonathan T. Looney pm->pm_sc.pm_reloadcount) 14985eaa6f01SJonathan T. Looney pp->pp_pmcs[ri].pp_pmcval -= 1499f263522aSJoseph Koshy pm->pm_sc.pm_reloadcount; 15005eaa6f01SJonathan T. Looney KASSERT(pp->pp_pmcs[ri].pp_pmcval > 0 && 15015eaa6f01SJonathan T. Looney pp->pp_pmcs[ri].pp_pmcval <= 15025eaa6f01SJonathan T. Looney pm->pm_sc.pm_reloadcount, 15035eaa6f01SJonathan T. Looney ("[pmc,%d] pp_pmcval outside of expected " 15045eaa6f01SJonathan T. Looney "range cpu=%d ri=%d pp_pmcval=%jx " 15055eaa6f01SJonathan T. Looney "pm_reloadcount=%jx", __LINE__, cpu, ri, 15065eaa6f01SJonathan T. Looney pp->pp_pmcs[ri].pp_pmcval, 15075eaa6f01SJonathan T. Looney pm->pm_sc.pm_reloadcount)); 1508f263522aSJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1509f263522aSJoseph Koshy 1510f263522aSJoseph Koshy } else { 15115eaa6f01SJonathan T. Looney tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 15125eaa6f01SJonathan T. Looney 15135eaa6f01SJonathan T. Looney PMCDBG3(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd (count)", 15145eaa6f01SJonathan T. Looney cpu, ri, tmp); 1515f263522aSJoseph Koshy 1516f263522aSJoseph Koshy /* 1517f263522aSJoseph Koshy * For counting process-virtual PMCs, 1518f263522aSJoseph Koshy * we expect the count to be 1519f263522aSJoseph Koshy * increasing monotonically, modulo a 64 1520f263522aSJoseph Koshy * bit wraparound. 1521f263522aSJoseph Koshy */ 15220c8cc7b0SKonstantin Belousov KASSERT(tmp >= 0, 1523ebccf1e3SJoseph Koshy ("[pmc,%d] negative increment cpu=%d " 1524ebccf1e3SJoseph Koshy "ri=%d newvalue=%jx saved=%jx " 1525ebccf1e3SJoseph Koshy "incr=%jx", __LINE__, cpu, ri, 1526f263522aSJoseph Koshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1527ebccf1e3SJoseph Koshy 1528ebccf1e3SJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1529ebccf1e3SJoseph Koshy pm->pm_gv.pm_savedvalue += tmp; 1530ebccf1e3SJoseph Koshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1531ebccf1e3SJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1532ebccf1e3SJoseph Koshy 1533f263522aSJoseph Koshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1534f263522aSJoseph Koshy pmclog_process_proccsw(pm, pp, tmp); 1535f263522aSJoseph Koshy } 1536ebccf1e3SJoseph Koshy } 1537ebccf1e3SJoseph Koshy 1538ebccf1e3SJoseph Koshy /* mark hardware as free */ 1539e829eb6dSJoseph Koshy pcd->pcd_config_pmc(cpu, adjri, NULL); 1540ebccf1e3SJoseph Koshy } 1541ebccf1e3SJoseph Koshy 1542ebccf1e3SJoseph Koshy /* 1543ebccf1e3SJoseph Koshy * perform any other architecture/cpu dependent thread 1544ebccf1e3SJoseph Koshy * switch out functions. 1545ebccf1e3SJoseph Koshy */ 1546ebccf1e3SJoseph Koshy 15476b8c8cd8SJoseph Koshy (void) (*md->pmd_switch_out)(pc, pp); 1548ebccf1e3SJoseph Koshy 1549ebccf1e3SJoseph Koshy critical_exit(); 1550f263522aSJoseph Koshy } 1551f263522aSJoseph Koshy 1552f263522aSJoseph Koshy /* 155349874f6eSJoseph Koshy * A mapping change for a process. 155449874f6eSJoseph Koshy */ 155549874f6eSJoseph Koshy 155649874f6eSJoseph Koshy static void 155749874f6eSJoseph Koshy pmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm) 155849874f6eSJoseph Koshy { 155949874f6eSJoseph Koshy int ri; 156049874f6eSJoseph Koshy pid_t pid; 156149874f6eSJoseph Koshy char *fullpath, *freepath; 156249874f6eSJoseph Koshy const struct pmc *pm; 156349874f6eSJoseph Koshy struct pmc_owner *po; 156449874f6eSJoseph Koshy const struct pmc_process *pp; 156549874f6eSJoseph Koshy 156649874f6eSJoseph Koshy freepath = fullpath = NULL; 1567*0f00315cSMatt Macy epoch_exit(global_epoch); 156849874f6eSJoseph Koshy pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath); 156949874f6eSJoseph Koshy 157049874f6eSJoseph Koshy pid = td->td_proc->p_pid; 157149874f6eSJoseph Koshy 1572*0f00315cSMatt Macy epoch_enter(global_epoch); 157349874f6eSJoseph Koshy /* Inform owners of all system-wide sampling PMCs. */ 1574*0f00315cSMatt Macy CK_LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 157549874f6eSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 157649874f6eSJoseph Koshy pmclog_process_map_in(po, pid, pkm->pm_address, fullpath); 157749874f6eSJoseph Koshy 157849874f6eSJoseph Koshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 157949874f6eSJoseph Koshy goto done; 158049874f6eSJoseph Koshy 158149874f6eSJoseph Koshy /* 158249874f6eSJoseph Koshy * Inform sampling PMC owners tracking this process. 158349874f6eSJoseph Koshy */ 158449874f6eSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 158549874f6eSJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 158649874f6eSJoseph Koshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 158749874f6eSJoseph Koshy pmclog_process_map_in(pm->pm_owner, 158849874f6eSJoseph Koshy pid, pkm->pm_address, fullpath); 158949874f6eSJoseph Koshy 159049874f6eSJoseph Koshy done: 159149874f6eSJoseph Koshy if (freepath) 15921ede983cSDag-Erling Smørgrav free(freepath, M_TEMP); 159349874f6eSJoseph Koshy } 159449874f6eSJoseph Koshy 159549874f6eSJoseph Koshy 159649874f6eSJoseph Koshy /* 159749874f6eSJoseph Koshy * Log an munmap request. 159849874f6eSJoseph Koshy */ 159949874f6eSJoseph Koshy 160049874f6eSJoseph Koshy static void 160149874f6eSJoseph Koshy pmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm) 160249874f6eSJoseph Koshy { 160349874f6eSJoseph Koshy int ri; 160449874f6eSJoseph Koshy pid_t pid; 160549874f6eSJoseph Koshy struct pmc_owner *po; 160649874f6eSJoseph Koshy const struct pmc *pm; 160749874f6eSJoseph Koshy const struct pmc_process *pp; 160849874f6eSJoseph Koshy 160949874f6eSJoseph Koshy pid = td->td_proc->p_pid; 161049874f6eSJoseph Koshy 1611*0f00315cSMatt Macy epoch_enter(global_epoch); 1612*0f00315cSMatt Macy CK_LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 161349874f6eSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 161449874f6eSJoseph Koshy pmclog_process_map_out(po, pid, pkm->pm_address, 161549874f6eSJoseph Koshy pkm->pm_address + pkm->pm_size); 1616*0f00315cSMatt Macy epoch_exit(global_epoch); 161749874f6eSJoseph Koshy 161849874f6eSJoseph Koshy if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL) 161949874f6eSJoseph Koshy return; 162049874f6eSJoseph Koshy 162149874f6eSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 162249874f6eSJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL && 162349874f6eSJoseph Koshy PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 16247c9f60e3SJoseph Koshy pmclog_process_map_out(pm->pm_owner, pid, 16257c9f60e3SJoseph Koshy pkm->pm_address, pkm->pm_address + pkm->pm_size); 162649874f6eSJoseph Koshy } 162749874f6eSJoseph Koshy 162849874f6eSJoseph Koshy /* 1629d07f36b0SJoseph Koshy * Log mapping information about the kernel. 1630d07f36b0SJoseph Koshy */ 1631d07f36b0SJoseph Koshy 1632d07f36b0SJoseph Koshy static void 1633d07f36b0SJoseph Koshy pmc_log_kernel_mappings(struct pmc *pm) 1634d07f36b0SJoseph Koshy { 1635d07f36b0SJoseph Koshy struct pmc_owner *po; 1636d07f36b0SJoseph Koshy struct pmckern_map_in *km, *kmbase; 1637d07f36b0SJoseph Koshy 1638*0f00315cSMatt Macy MPASS(in_epoch() || sx_xlocked(&pmc_sx)); 1639d07f36b0SJoseph Koshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 1640d07f36b0SJoseph Koshy ("[pmc,%d] non-sampling PMC (%p) desires mapping information", 1641d07f36b0SJoseph Koshy __LINE__, (void *) pm)); 1642d07f36b0SJoseph Koshy 1643d07f36b0SJoseph Koshy po = pm->pm_owner; 1644d07f36b0SJoseph Koshy 1645d07f36b0SJoseph Koshy if (po->po_flags & PMC_PO_INITIAL_MAPPINGS_DONE) 1646d07f36b0SJoseph Koshy return; 1647d07f36b0SJoseph Koshy 1648d07f36b0SJoseph Koshy /* 1649d07f36b0SJoseph Koshy * Log the current set of kernel modules. 1650d07f36b0SJoseph Koshy */ 1651d07f36b0SJoseph Koshy kmbase = linker_hwpmc_list_objects(); 1652d07f36b0SJoseph Koshy for (km = kmbase; km->pm_file != NULL; km++) { 16534a3690dfSJohn Baldwin PMCDBG2(LOG,REG,1,"%s %p", (char *) km->pm_file, 1654d07f36b0SJoseph Koshy (void *) km->pm_address); 1655d07f36b0SJoseph Koshy pmclog_process_map_in(po, (pid_t) -1, km->pm_address, 1656d07f36b0SJoseph Koshy km->pm_file); 1657d07f36b0SJoseph Koshy } 16581ede983cSDag-Erling Smørgrav free(kmbase, M_LINKER); 1659d07f36b0SJoseph Koshy 1660d07f36b0SJoseph Koshy po->po_flags |= PMC_PO_INITIAL_MAPPINGS_DONE; 1661d07f36b0SJoseph Koshy } 1662d07f36b0SJoseph Koshy 1663d07f36b0SJoseph Koshy /* 1664d07f36b0SJoseph Koshy * Log the mappings for a single process. 1665d07f36b0SJoseph Koshy */ 1666d07f36b0SJoseph Koshy 1667d07f36b0SJoseph Koshy static void 1668d07f36b0SJoseph Koshy pmc_log_process_mappings(struct pmc_owner *po, struct proc *p) 1669d07f36b0SJoseph Koshy { 1670bf792d68SJoseph Koshy vm_map_t map; 1671bf792d68SJoseph Koshy struct vnode *vp; 1672bf792d68SJoseph Koshy struct vmspace *vm; 1673bf792d68SJoseph Koshy vm_map_entry_t entry; 1674bf792d68SJoseph Koshy vm_offset_t last_end; 1675bf792d68SJoseph Koshy u_int last_timestamp; 1676bf792d68SJoseph Koshy struct vnode *last_vp; 1677bf792d68SJoseph Koshy vm_offset_t start_addr; 1678bf792d68SJoseph Koshy vm_object_t obj, lobj, tobj; 1679bf792d68SJoseph Koshy char *fullpath, *freepath; 1680bf792d68SJoseph Koshy 1681bf792d68SJoseph Koshy last_vp = NULL; 1682bf792d68SJoseph Koshy last_end = (vm_offset_t) 0; 1683bf792d68SJoseph Koshy fullpath = freepath = NULL; 1684bf792d68SJoseph Koshy 1685bf792d68SJoseph Koshy if ((vm = vmspace_acquire_ref(p)) == NULL) 1686bf792d68SJoseph Koshy return; 1687bf792d68SJoseph Koshy 1688bf792d68SJoseph Koshy map = &vm->vm_map; 1689bf792d68SJoseph Koshy vm_map_lock_read(map); 1690bf792d68SJoseph Koshy 1691bf792d68SJoseph Koshy for (entry = map->header.next; entry != &map->header; entry = entry->next) { 1692bf792d68SJoseph Koshy 1693bf792d68SJoseph Koshy if (entry == NULL) { 16944a3690dfSJohn Baldwin PMCDBG2(LOG,OPS,2, "hwpmc: vm_map entry unexpectedly " 1695bf792d68SJoseph Koshy "NULL! pid=%d vm_map=%p\n", p->p_pid, map); 1696bf792d68SJoseph Koshy break; 1697bf792d68SJoseph Koshy } 1698bf792d68SJoseph Koshy 1699bf792d68SJoseph Koshy /* 1700bf792d68SJoseph Koshy * We only care about executable map entries. 1701bf792d68SJoseph Koshy */ 1702bf792d68SJoseph Koshy if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 1703bf792d68SJoseph Koshy !(entry->protection & VM_PROT_EXECUTE) || 1704bf792d68SJoseph Koshy (entry->object.vm_object == NULL)) { 1705bf792d68SJoseph Koshy continue; 1706bf792d68SJoseph Koshy } 1707bf792d68SJoseph Koshy 1708bf792d68SJoseph Koshy obj = entry->object.vm_object; 170966c392dfSAlan Cox VM_OBJECT_RLOCK(obj); 1710bf792d68SJoseph Koshy 1711bf792d68SJoseph Koshy /* 1712bf792d68SJoseph Koshy * Walk the backing_object list to find the base 1713bf792d68SJoseph Koshy * (non-shadowed) vm_object. 1714bf792d68SJoseph Koshy */ 1715bf792d68SJoseph Koshy for (lobj = tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 1716bf792d68SJoseph Koshy if (tobj != obj) 171766c392dfSAlan Cox VM_OBJECT_RLOCK(tobj); 1718bf792d68SJoseph Koshy if (lobj != obj) 171966c392dfSAlan Cox VM_OBJECT_RUNLOCK(lobj); 1720bf792d68SJoseph Koshy lobj = tobj; 1721bf792d68SJoseph Koshy } 1722bf792d68SJoseph Koshy 1723bf792d68SJoseph Koshy /* 1724bf792d68SJoseph Koshy * At this point lobj is the base vm_object and it is locked. 1725bf792d68SJoseph Koshy */ 1726bf792d68SJoseph Koshy if (lobj == NULL) { 17274a3690dfSJohn Baldwin PMCDBG3(LOG,OPS,2, "hwpmc: lobj unexpectedly NULL! pid=%d " 1728bf792d68SJoseph Koshy "vm_map=%p vm_obj=%p\n", p->p_pid, map, obj); 172966c392dfSAlan Cox VM_OBJECT_RUNLOCK(obj); 1730bf792d68SJoseph Koshy continue; 1731bf792d68SJoseph Koshy } 1732bf792d68SJoseph Koshy 173363e4c6cdSEric van Gyzen vp = vm_object_vnode(lobj); 173463e4c6cdSEric van Gyzen if (vp == NULL) { 1735bf792d68SJoseph Koshy if (lobj != obj) 173666c392dfSAlan Cox VM_OBJECT_RUNLOCK(lobj); 173766c392dfSAlan Cox VM_OBJECT_RUNLOCK(obj); 1738bf792d68SJoseph Koshy continue; 1739bf792d68SJoseph Koshy } 1740bf792d68SJoseph Koshy 1741bf792d68SJoseph Koshy /* 1742bf792d68SJoseph Koshy * Skip contiguous regions that point to the same 1743bf792d68SJoseph Koshy * vnode, so we don't emit redundant MAP-IN 1744bf792d68SJoseph Koshy * directives. 1745bf792d68SJoseph Koshy */ 174663e4c6cdSEric van Gyzen if (entry->start == last_end && vp == last_vp) { 1747bf792d68SJoseph Koshy last_end = entry->end; 1748bf792d68SJoseph Koshy if (lobj != obj) 174966c392dfSAlan Cox VM_OBJECT_RUNLOCK(lobj); 175066c392dfSAlan Cox VM_OBJECT_RUNLOCK(obj); 1751bf792d68SJoseph Koshy continue; 1752bf792d68SJoseph Koshy } 1753bf792d68SJoseph Koshy 1754bf792d68SJoseph Koshy /* 1755bf792d68SJoseph Koshy * We don't want to keep the proc's vm_map or this 1756bf792d68SJoseph Koshy * vm_object locked while we walk the pathname, since 1757bf792d68SJoseph Koshy * vn_fullpath() can sleep. However, if we drop the 1758bf792d68SJoseph Koshy * lock, it's possible for concurrent activity to 1759bf792d68SJoseph Koshy * modify the vm_map list. To protect against this, 1760bf792d68SJoseph Koshy * we save the vm_map timestamp before we release the 1761bf792d68SJoseph Koshy * lock, and check it after we reacquire the lock 1762bf792d68SJoseph Koshy * below. 1763bf792d68SJoseph Koshy */ 1764bf792d68SJoseph Koshy start_addr = entry->start; 1765bf792d68SJoseph Koshy last_end = entry->end; 1766bf792d68SJoseph Koshy last_timestamp = map->timestamp; 1767bf792d68SJoseph Koshy vm_map_unlock_read(map); 1768bf792d68SJoseph Koshy 1769bf792d68SJoseph Koshy vref(vp); 1770bf792d68SJoseph Koshy if (lobj != obj) 177166c392dfSAlan Cox VM_OBJECT_RUNLOCK(lobj); 1772bf792d68SJoseph Koshy 177366c392dfSAlan Cox VM_OBJECT_RUNLOCK(obj); 1774bf792d68SJoseph Koshy 1775bf792d68SJoseph Koshy freepath = NULL; 1776bf792d68SJoseph Koshy pmc_getfilename(vp, &fullpath, &freepath); 1777bf792d68SJoseph Koshy last_vp = vp; 1778e9b5dc16SJoseph Koshy 1779bf792d68SJoseph Koshy vrele(vp); 1780e9b5dc16SJoseph Koshy 1781bf792d68SJoseph Koshy vp = NULL; 1782bf792d68SJoseph Koshy pmclog_process_map_in(po, p->p_pid, start_addr, fullpath); 1783bf792d68SJoseph Koshy if (freepath) 1784bf792d68SJoseph Koshy free(freepath, M_TEMP); 1785bf792d68SJoseph Koshy 1786bf792d68SJoseph Koshy vm_map_lock_read(map); 1787bf792d68SJoseph Koshy 1788bf792d68SJoseph Koshy /* 1789bf792d68SJoseph Koshy * If our saved timestamp doesn't match, this means 1790bf792d68SJoseph Koshy * that the vm_map was modified out from under us and 1791bf792d68SJoseph Koshy * we can't trust our current "entry" pointer. Do a 1792bf792d68SJoseph Koshy * new lookup for this entry. If there is no entry 1793bf792d68SJoseph Koshy * for this address range, vm_map_lookup_entry() will 1794bf792d68SJoseph Koshy * return the previous one, so we always want to go to 1795bf792d68SJoseph Koshy * entry->next on the next loop iteration. 1796bf792d68SJoseph Koshy * 1797bf792d68SJoseph Koshy * There is an edge condition here that can occur if 1798bf792d68SJoseph Koshy * there is no entry at or before this address. In 1799bf792d68SJoseph Koshy * this situation, vm_map_lookup_entry returns 1800bf792d68SJoseph Koshy * &map->header, which would cause our loop to abort 1801bf792d68SJoseph Koshy * without processing the rest of the map. However, 1802bf792d68SJoseph Koshy * in practice this will never happen for process 1803bf792d68SJoseph Koshy * vm_map. This is because the executable's text 1804bf792d68SJoseph Koshy * segment is the first mapping in the proc's address 1805bf792d68SJoseph Koshy * space, and this mapping is never removed until the 1806bf792d68SJoseph Koshy * process exits, so there will always be a non-header 1807bf792d68SJoseph Koshy * entry at or before the requested address for 1808bf792d68SJoseph Koshy * vm_map_lookup_entry to return. 1809bf792d68SJoseph Koshy */ 1810bf792d68SJoseph Koshy if (map->timestamp != last_timestamp) 1811bf792d68SJoseph Koshy vm_map_lookup_entry(map, last_end - 1, &entry); 1812bf792d68SJoseph Koshy } 1813bf792d68SJoseph Koshy 1814bf792d68SJoseph Koshy vm_map_unlock_read(map); 1815bf792d68SJoseph Koshy vmspace_free(vm); 1816bf792d68SJoseph Koshy return; 1817d07f36b0SJoseph Koshy } 1818d07f36b0SJoseph Koshy 1819d07f36b0SJoseph Koshy /* 1820d07f36b0SJoseph Koshy * Log mappings for all processes in the system. 1821d07f36b0SJoseph Koshy */ 1822d07f36b0SJoseph Koshy 1823d07f36b0SJoseph Koshy static void 1824d07f36b0SJoseph Koshy pmc_log_all_process_mappings(struct pmc_owner *po) 1825d07f36b0SJoseph Koshy { 1826d07f36b0SJoseph Koshy struct proc *p, *top; 1827d07f36b0SJoseph Koshy 1828d07f36b0SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1829d07f36b0SJoseph Koshy 1830d07f36b0SJoseph Koshy if ((p = pfind(1)) == NULL) 1831d07f36b0SJoseph Koshy panic("[pmc,%d] Cannot find init", __LINE__); 1832d07f36b0SJoseph Koshy 1833d07f36b0SJoseph Koshy PROC_UNLOCK(p); 1834d07f36b0SJoseph Koshy 1835d07f36b0SJoseph Koshy sx_slock(&proctree_lock); 1836d07f36b0SJoseph Koshy 1837d07f36b0SJoseph Koshy top = p; 1838d07f36b0SJoseph Koshy 1839d07f36b0SJoseph Koshy for (;;) { 1840d07f36b0SJoseph Koshy pmc_log_process_mappings(po, p); 1841d07f36b0SJoseph Koshy if (!LIST_EMPTY(&p->p_children)) 1842d07f36b0SJoseph Koshy p = LIST_FIRST(&p->p_children); 1843d07f36b0SJoseph Koshy else for (;;) { 1844d07f36b0SJoseph Koshy if (p == top) 1845d07f36b0SJoseph Koshy goto done; 1846d07f36b0SJoseph Koshy if (LIST_NEXT(p, p_sibling)) { 1847d07f36b0SJoseph Koshy p = LIST_NEXT(p, p_sibling); 1848d07f36b0SJoseph Koshy break; 1849d07f36b0SJoseph Koshy } 1850d07f36b0SJoseph Koshy p = p->p_pptr; 1851d07f36b0SJoseph Koshy } 1852d07f36b0SJoseph Koshy } 1853d07f36b0SJoseph Koshy done: 1854d07f36b0SJoseph Koshy sx_sunlock(&proctree_lock); 1855d07f36b0SJoseph Koshy } 1856d07f36b0SJoseph Koshy 1857d07f36b0SJoseph Koshy /* 1858f263522aSJoseph Koshy * The 'hook' invoked from the kernel proper 1859f263522aSJoseph Koshy */ 1860f263522aSJoseph Koshy 1861f263522aSJoseph Koshy 1862680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 1863f263522aSJoseph Koshy const char *pmc_hooknames[] = { 186449874f6eSJoseph Koshy /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */ 1865f263522aSJoseph Koshy "", 1866f263522aSJoseph Koshy "EXEC", 1867f263522aSJoseph Koshy "CSW-IN", 1868f263522aSJoseph Koshy "CSW-OUT", 186949874f6eSJoseph Koshy "SAMPLE", 187029f4e216SMark Johnston "UNUSED1", 187129f4e216SMark Johnston "UNUSED2", 187249874f6eSJoseph Koshy "MMAP", 1873d07f36b0SJoseph Koshy "MUNMAP", 1874f5f9340bSFabien Thomas "CALLCHAIN-NMI", 1875f5f9340bSFabien Thomas "CALLCHAIN-SOFT", 1876f5f9340bSFabien Thomas "SOFTSAMPLING" 1877f263522aSJoseph Koshy }; 1878f263522aSJoseph Koshy #endif 1879f263522aSJoseph Koshy 1880f263522aSJoseph Koshy static int 1881f263522aSJoseph Koshy pmc_hook_handler(struct thread *td, int function, void *arg) 1882f263522aSJoseph Koshy { 1883f263522aSJoseph Koshy 18844a3690dfSJohn Baldwin PMCDBG4(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1885f263522aSJoseph Koshy pmc_hooknames[function], arg); 1886f263522aSJoseph Koshy 1887f263522aSJoseph Koshy switch (function) 1888f263522aSJoseph Koshy { 1889f263522aSJoseph Koshy 1890f263522aSJoseph Koshy /* 1891f263522aSJoseph Koshy * Process exec() 1892f263522aSJoseph Koshy */ 1893f263522aSJoseph Koshy 1894f263522aSJoseph Koshy case PMC_FN_PROCESS_EXEC: 1895f263522aSJoseph Koshy { 1896f263522aSJoseph Koshy char *fullpath, *freepath; 1897f263522aSJoseph Koshy unsigned int ri; 1898f263522aSJoseph Koshy int is_using_hwpmcs; 1899f263522aSJoseph Koshy struct pmc *pm; 1900f263522aSJoseph Koshy struct proc *p; 1901f263522aSJoseph Koshy struct pmc_owner *po; 1902f263522aSJoseph Koshy struct pmc_process *pp; 190315139246SJoseph Koshy struct pmckern_procexec *pk; 1904f263522aSJoseph Koshy 1905f263522aSJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1906f263522aSJoseph Koshy 1907f263522aSJoseph Koshy p = td->td_proc; 190815139246SJoseph Koshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 190915139246SJoseph Koshy 191015139246SJoseph Koshy pk = (struct pmckern_procexec *) arg; 1911f263522aSJoseph Koshy 1912*0f00315cSMatt Macy epoch_enter(global_epoch); 1913f263522aSJoseph Koshy /* Inform owners of SS mode PMCs of the exec event. */ 1914*0f00315cSMatt Macy CK_LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1915f263522aSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 191615139246SJoseph Koshy pmclog_process_procexec(po, PMC_ID_INVALID, 191715139246SJoseph Koshy p->p_pid, pk->pm_entryaddr, fullpath); 1918*0f00315cSMatt Macy epoch_exit(global_epoch); 1919f263522aSJoseph Koshy 1920f263522aSJoseph Koshy PROC_LOCK(p); 1921f263522aSJoseph Koshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1922f263522aSJoseph Koshy PROC_UNLOCK(p); 1923f263522aSJoseph Koshy 1924f263522aSJoseph Koshy if (!is_using_hwpmcs) { 1925f263522aSJoseph Koshy if (freepath) 19261ede983cSDag-Erling Smørgrav free(freepath, M_TEMP); 1927f263522aSJoseph Koshy break; 1928f263522aSJoseph Koshy } 1929f263522aSJoseph Koshy 1930f263522aSJoseph Koshy /* 1931f263522aSJoseph Koshy * PMCs are not inherited across an exec(): remove any 1932f263522aSJoseph Koshy * PMCs that this process is the owner of. 1933f263522aSJoseph Koshy */ 1934f263522aSJoseph Koshy 1935f263522aSJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1936f263522aSJoseph Koshy pmc_remove_owner(po); 1937f263522aSJoseph Koshy pmc_destroy_owner_descriptor(po); 1938f263522aSJoseph Koshy } 1939f263522aSJoseph Koshy 1940f263522aSJoseph Koshy /* 19412b01a084SJoseph Koshy * If the process being exec'ed is not the target of any 19422b01a084SJoseph Koshy * PMC, we are done. 1943f263522aSJoseph Koshy */ 19442b01a084SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) { 19452b01a084SJoseph Koshy if (freepath) 19461ede983cSDag-Erling Smørgrav free(freepath, M_TEMP); 1947f263522aSJoseph Koshy break; 19482b01a084SJoseph Koshy } 1949f263522aSJoseph Koshy 1950f263522aSJoseph Koshy /* 1951f263522aSJoseph Koshy * Log the exec event to all monitoring owners. Skip 1952b790c193SPedro F. Giffuni * owners who have already received the event because 19532b01a084SJoseph Koshy * they had system sampling PMCs active. 1954f263522aSJoseph Koshy */ 1955f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 1956f263522aSJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1957f263522aSJoseph Koshy po = pm->pm_owner; 1958f263522aSJoseph Koshy if (po->po_sscount == 0 && 1959f263522aSJoseph Koshy po->po_flags & PMC_PO_OWNS_LOGFILE) 196015139246SJoseph Koshy pmclog_process_procexec(po, pm->pm_id, 196115139246SJoseph Koshy p->p_pid, pk->pm_entryaddr, 1962f263522aSJoseph Koshy fullpath); 1963f263522aSJoseph Koshy } 1964f263522aSJoseph Koshy 1965f263522aSJoseph Koshy if (freepath) 19661ede983cSDag-Erling Smørgrav free(freepath, M_TEMP); 1967f263522aSJoseph Koshy 1968f263522aSJoseph Koshy 19694a3690dfSJohn Baldwin PMCDBG4(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 197015139246SJoseph Koshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1971f263522aSJoseph Koshy 197215139246SJoseph Koshy if (pk->pm_credentialschanged == 0) /* no change */ 1973f263522aSJoseph Koshy break; 1974f263522aSJoseph Koshy 1975f263522aSJoseph Koshy /* 1976f263522aSJoseph Koshy * If the newly exec()'ed process has a different credential 1977f263522aSJoseph Koshy * than before, allow it to be the target of a PMC only if 1978b790c193SPedro F. Giffuni * the PMC's owner has sufficient privilege. 1979f263522aSJoseph Koshy */ 1980f263522aSJoseph Koshy 1981f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 1982f263522aSJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1983f263522aSJoseph Koshy if (pmc_can_attach(pm, td->td_proc) != 0) 1984f263522aSJoseph Koshy pmc_detach_one_process(td->td_proc, 1985f263522aSJoseph Koshy pm, PMC_FLAG_NONE); 1986f263522aSJoseph Koshy 1987fa630f35SFabien Thomas KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc, 1988f263522aSJoseph Koshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1989f263522aSJoseph Koshy pp->pp_refcnt, pp)); 1990f263522aSJoseph Koshy 1991f263522aSJoseph Koshy /* 1992f263522aSJoseph Koshy * If this process is no longer the target of any 1993f263522aSJoseph Koshy * PMCs, we can remove the process entry and free 1994f263522aSJoseph Koshy * up space. 1995f263522aSJoseph Koshy */ 1996f263522aSJoseph Koshy 1997f263522aSJoseph Koshy if (pp->pp_refcnt == 0) { 1998f263522aSJoseph Koshy pmc_remove_process_descriptor(pp); 19991ede983cSDag-Erling Smørgrav free(pp, M_PMC); 2000f263522aSJoseph Koshy break; 2001f263522aSJoseph Koshy } 2002ebccf1e3SJoseph Koshy 2003ebccf1e3SJoseph Koshy } 2004ebccf1e3SJoseph Koshy break; 2005ebccf1e3SJoseph Koshy 2006f263522aSJoseph Koshy case PMC_FN_CSW_IN: 2007f263522aSJoseph Koshy pmc_process_csw_in(td); 2008f263522aSJoseph Koshy break; 2009f263522aSJoseph Koshy 2010f263522aSJoseph Koshy case PMC_FN_CSW_OUT: 2011f263522aSJoseph Koshy pmc_process_csw_out(td); 2012f263522aSJoseph Koshy break; 2013f263522aSJoseph Koshy 2014f263522aSJoseph Koshy /* 2015f263522aSJoseph Koshy * Process accumulated PC samples. 2016f263522aSJoseph Koshy * 2017f263522aSJoseph Koshy * This function is expected to be called by hardclock() for 2018f263522aSJoseph Koshy * each CPU that has accumulated PC samples. 2019f263522aSJoseph Koshy * 2020f263522aSJoseph Koshy * This function is to be executed on the CPU whose samples 2021f263522aSJoseph Koshy * are being processed. 2022f263522aSJoseph Koshy */ 2023f263522aSJoseph Koshy case PMC_FN_DO_SAMPLES: 2024f263522aSJoseph Koshy 2025f263522aSJoseph Koshy /* 2026f263522aSJoseph Koshy * Clear the cpu specific bit in the CPU mask before 2027f263522aSJoseph Koshy * do the rest of the processing. If the NMI handler 2028f263522aSJoseph Koshy * gets invoked after the "atomic_clear_int()" call 2029f263522aSJoseph Koshy * below but before "pmc_process_samples()" gets 2030f263522aSJoseph Koshy * around to processing the interrupt, then we will 2031f263522aSJoseph Koshy * come back here at the next hardclock() tick (and 2032f263522aSJoseph Koshy * may find nothing to do if "pmc_process_samples()" 2033f263522aSJoseph Koshy * had already processed the interrupt). We don't 2034f263522aSJoseph Koshy * lose the interrupt sample. 2035f263522aSJoseph Koshy */ 2036e6b475e0SMatt Macy DPCPU_SET(pmc_sampled, 0); 2037f5f9340bSFabien Thomas pmc_process_samples(PCPU_GET(cpuid), PMC_HR); 2038f5f9340bSFabien Thomas pmc_process_samples(PCPU_GET(cpuid), PMC_SR); 2039f263522aSJoseph Koshy break; 2040f263522aSJoseph Koshy 204149874f6eSJoseph Koshy case PMC_FN_MMAP: 2042*0f00315cSMatt Macy MPASS(in_epoch() || sx_xlocked(&pmc_sx)); 204349874f6eSJoseph Koshy pmc_process_mmap(td, (struct pmckern_map_in *) arg); 204449874f6eSJoseph Koshy break; 204549874f6eSJoseph Koshy 204649874f6eSJoseph Koshy case PMC_FN_MUNMAP: 2047*0f00315cSMatt Macy MPASS(in_epoch() || sx_xlocked(&pmc_sx)); 204849874f6eSJoseph Koshy pmc_process_munmap(td, (struct pmckern_map_out *) arg); 204949874f6eSJoseph Koshy break; 205049874f6eSJoseph Koshy 2051d07f36b0SJoseph Koshy case PMC_FN_USER_CALLCHAIN: 2052d07f36b0SJoseph Koshy /* 2053d07f36b0SJoseph Koshy * Record a call chain. 2054d07f36b0SJoseph Koshy */ 20556fe00c78SJoseph Koshy KASSERT(td == curthread, ("[pmc,%d] td != curthread", 20566fe00c78SJoseph Koshy __LINE__)); 2057f5f9340bSFabien Thomas 2058f5f9340bSFabien Thomas pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_HR, 2059d07f36b0SJoseph Koshy (struct trapframe *) arg); 20606fe00c78SJoseph Koshy td->td_pflags &= ~TDP_CALLCHAIN; 2061d07f36b0SJoseph Koshy break; 2062d07f36b0SJoseph Koshy 2063f5f9340bSFabien Thomas case PMC_FN_USER_CALLCHAIN_SOFT: 2064f5f9340bSFabien Thomas /* 2065f5f9340bSFabien Thomas * Record a call chain. 2066f5f9340bSFabien Thomas */ 2067f5f9340bSFabien Thomas KASSERT(td == curthread, ("[pmc,%d] td != curthread", 2068f5f9340bSFabien Thomas __LINE__)); 2069f5f9340bSFabien Thomas pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_SR, 2070f5f9340bSFabien Thomas (struct trapframe *) arg); 2071f5f9340bSFabien Thomas td->td_pflags &= ~TDP_CALLCHAIN; 2072f5f9340bSFabien Thomas break; 2073f5f9340bSFabien Thomas 2074f5f9340bSFabien Thomas case PMC_FN_SOFT_SAMPLING: 2075f5f9340bSFabien Thomas /* 2076f5f9340bSFabien Thomas * Call soft PMC sampling intr. 2077f5f9340bSFabien Thomas */ 2078f5f9340bSFabien Thomas pmc_soft_intr((struct pmckern_soft *) arg); 2079f5f9340bSFabien Thomas break; 2080f5f9340bSFabien Thomas 2081ebccf1e3SJoseph Koshy default: 2082680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 2083ebccf1e3SJoseph Koshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 2084ebccf1e3SJoseph Koshy #endif 2085ebccf1e3SJoseph Koshy break; 2086ebccf1e3SJoseph Koshy 2087ebccf1e3SJoseph Koshy } 2088ebccf1e3SJoseph Koshy 2089ebccf1e3SJoseph Koshy return 0; 2090ebccf1e3SJoseph Koshy } 2091ebccf1e3SJoseph Koshy 2092ebccf1e3SJoseph Koshy /* 2093ebccf1e3SJoseph Koshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 2094ebccf1e3SJoseph Koshy */ 2095ebccf1e3SJoseph Koshy 2096ebccf1e3SJoseph Koshy static struct pmc_owner * 2097ebccf1e3SJoseph Koshy pmc_allocate_owner_descriptor(struct proc *p) 2098ebccf1e3SJoseph Koshy { 2099ebccf1e3SJoseph Koshy uint32_t hindex; 2100ebccf1e3SJoseph Koshy struct pmc_owner *po; 2101ebccf1e3SJoseph Koshy struct pmc_ownerhash *poh; 2102ebccf1e3SJoseph Koshy 2103ebccf1e3SJoseph Koshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2104ebccf1e3SJoseph Koshy poh = &pmc_ownerhash[hindex]; 2105ebccf1e3SJoseph Koshy 2106ebccf1e3SJoseph Koshy /* allocate space for N pointers and one descriptor struct */ 2107e829eb6dSJoseph Koshy po = malloc(sizeof(struct pmc_owner), M_PMC, M_WAITOK|M_ZERO); 2108ebccf1e3SJoseph Koshy po->po_owner = p; 2109ebccf1e3SJoseph Koshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 2110ebccf1e3SJoseph Koshy 2111f263522aSJoseph Koshy TAILQ_INIT(&po->po_logbuffers); 2112382d30cdSJoseph Koshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc-per-proc", MTX_SPIN); 2113f263522aSJoseph Koshy 21144a3690dfSJohn Baldwin PMCDBG4(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 2115ebccf1e3SJoseph Koshy p, p->p_pid, p->p_comm, po); 2116ebccf1e3SJoseph Koshy 2117ebccf1e3SJoseph Koshy return po; 2118ebccf1e3SJoseph Koshy } 2119ebccf1e3SJoseph Koshy 2120f263522aSJoseph Koshy static void 2121f263522aSJoseph Koshy pmc_destroy_owner_descriptor(struct pmc_owner *po) 2122f263522aSJoseph Koshy { 2123f263522aSJoseph Koshy 21244a3690dfSJohn Baldwin PMCDBG4(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 2125f263522aSJoseph Koshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 2126f263522aSJoseph Koshy 2127f263522aSJoseph Koshy mtx_destroy(&po->po_mtx); 21281ede983cSDag-Erling Smørgrav free(po, M_PMC); 2129f263522aSJoseph Koshy } 2130f263522aSJoseph Koshy 2131ebccf1e3SJoseph Koshy /* 2132ebccf1e3SJoseph Koshy * find the descriptor corresponding to process 'p', adding or removing it 2133ebccf1e3SJoseph Koshy * as specified by 'mode'. 2134ebccf1e3SJoseph Koshy */ 2135ebccf1e3SJoseph Koshy 2136ebccf1e3SJoseph Koshy static struct pmc_process * 2137ebccf1e3SJoseph Koshy pmc_find_process_descriptor(struct proc *p, uint32_t mode) 2138ebccf1e3SJoseph Koshy { 2139ebccf1e3SJoseph Koshy uint32_t hindex; 2140ebccf1e3SJoseph Koshy struct pmc_process *pp, *ppnew; 2141ebccf1e3SJoseph Koshy struct pmc_processhash *pph; 2142ebccf1e3SJoseph Koshy 2143ebccf1e3SJoseph Koshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 2144ebccf1e3SJoseph Koshy pph = &pmc_processhash[hindex]; 2145ebccf1e3SJoseph Koshy 2146ebccf1e3SJoseph Koshy ppnew = NULL; 2147ebccf1e3SJoseph Koshy 2148ebccf1e3SJoseph Koshy /* 2149ebccf1e3SJoseph Koshy * Pre-allocate memory in the FIND_ALLOCATE case since we 2150ebccf1e3SJoseph Koshy * cannot call malloc(9) once we hold a spin lock. 2151ebccf1e3SJoseph Koshy */ 2152e829eb6dSJoseph Koshy if (mode & PMC_FLAG_ALLOCATE) 21531ede983cSDag-Erling Smørgrav ppnew = malloc(sizeof(struct pmc_process) + md->pmd_npmc * 2154e829eb6dSJoseph Koshy sizeof(struct pmc_targetstate), M_PMC, M_WAITOK|M_ZERO); 2155ebccf1e3SJoseph Koshy 2156ebccf1e3SJoseph Koshy mtx_lock_spin(&pmc_processhash_mtx); 2157ebccf1e3SJoseph Koshy LIST_FOREACH(pp, pph, pp_next) 2158ebccf1e3SJoseph Koshy if (pp->pp_proc == p) 2159ebccf1e3SJoseph Koshy break; 2160ebccf1e3SJoseph Koshy 2161ebccf1e3SJoseph Koshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 2162ebccf1e3SJoseph Koshy LIST_REMOVE(pp, pp_next); 2163ebccf1e3SJoseph Koshy 2164ebccf1e3SJoseph Koshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 2165ebccf1e3SJoseph Koshy ppnew != NULL) { 2166ebccf1e3SJoseph Koshy ppnew->pp_proc = p; 2167ebccf1e3SJoseph Koshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 2168ebccf1e3SJoseph Koshy pp = ppnew; 2169ebccf1e3SJoseph Koshy ppnew = NULL; 2170ebccf1e3SJoseph Koshy } 2171ebccf1e3SJoseph Koshy mtx_unlock_spin(&pmc_processhash_mtx); 2172ebccf1e3SJoseph Koshy 2173ebccf1e3SJoseph Koshy if (pp != NULL && ppnew != NULL) 21741ede983cSDag-Erling Smørgrav free(ppnew, M_PMC); 2175ebccf1e3SJoseph Koshy 2176ebccf1e3SJoseph Koshy return pp; 2177ebccf1e3SJoseph Koshy } 2178ebccf1e3SJoseph Koshy 2179ebccf1e3SJoseph Koshy /* 2180ebccf1e3SJoseph Koshy * remove a process descriptor from the process hash table. 2181ebccf1e3SJoseph Koshy */ 2182ebccf1e3SJoseph Koshy 2183ebccf1e3SJoseph Koshy static void 2184ebccf1e3SJoseph Koshy pmc_remove_process_descriptor(struct pmc_process *pp) 2185ebccf1e3SJoseph Koshy { 2186ebccf1e3SJoseph Koshy KASSERT(pp->pp_refcnt == 0, 2187ebccf1e3SJoseph Koshy ("[pmc,%d] Removing process descriptor %p with count %d", 2188ebccf1e3SJoseph Koshy __LINE__, pp, pp->pp_refcnt)); 2189ebccf1e3SJoseph Koshy 2190ebccf1e3SJoseph Koshy mtx_lock_spin(&pmc_processhash_mtx); 2191ebccf1e3SJoseph Koshy LIST_REMOVE(pp, pp_next); 2192ebccf1e3SJoseph Koshy mtx_unlock_spin(&pmc_processhash_mtx); 2193ebccf1e3SJoseph Koshy } 2194ebccf1e3SJoseph Koshy 2195ebccf1e3SJoseph Koshy 2196ebccf1e3SJoseph Koshy /* 2197ebccf1e3SJoseph Koshy * find an owner descriptor corresponding to proc 'p' 2198ebccf1e3SJoseph Koshy */ 2199ebccf1e3SJoseph Koshy 2200ebccf1e3SJoseph Koshy static struct pmc_owner * 2201ebccf1e3SJoseph Koshy pmc_find_owner_descriptor(struct proc *p) 2202ebccf1e3SJoseph Koshy { 2203ebccf1e3SJoseph Koshy uint32_t hindex; 2204ebccf1e3SJoseph Koshy struct pmc_owner *po; 2205ebccf1e3SJoseph Koshy struct pmc_ownerhash *poh; 2206ebccf1e3SJoseph Koshy 2207ebccf1e3SJoseph Koshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 2208ebccf1e3SJoseph Koshy poh = &pmc_ownerhash[hindex]; 2209ebccf1e3SJoseph Koshy 2210ebccf1e3SJoseph Koshy po = NULL; 2211ebccf1e3SJoseph Koshy LIST_FOREACH(po, poh, po_next) 2212ebccf1e3SJoseph Koshy if (po->po_owner == p) 2213ebccf1e3SJoseph Koshy break; 2214ebccf1e3SJoseph Koshy 22154a3690dfSJohn Baldwin PMCDBG5(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 2216ebccf1e3SJoseph Koshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 2217ebccf1e3SJoseph Koshy 2218ebccf1e3SJoseph Koshy return po; 2219ebccf1e3SJoseph Koshy } 2220ebccf1e3SJoseph Koshy 2221ebccf1e3SJoseph Koshy /* 2222ebccf1e3SJoseph Koshy * pmc_allocate_pmc_descriptor 2223ebccf1e3SJoseph Koshy * 2224ebccf1e3SJoseph Koshy * Allocate a pmc descriptor and initialize its 2225ebccf1e3SJoseph Koshy * fields. 2226ebccf1e3SJoseph Koshy */ 2227ebccf1e3SJoseph Koshy 2228ebccf1e3SJoseph Koshy static struct pmc * 2229ebccf1e3SJoseph Koshy pmc_allocate_pmc_descriptor(void) 2230ebccf1e3SJoseph Koshy { 2231ebccf1e3SJoseph Koshy struct pmc *pmc; 2232ebccf1e3SJoseph Koshy 2233e829eb6dSJoseph Koshy pmc = malloc(sizeof(struct pmc), M_PMC, M_WAITOK|M_ZERO); 2234e6b475e0SMatt Macy pmc->pm_runcount = counter_u64_alloc(M_WAITOK); 2235e6b475e0SMatt Macy pmc->pm_pcpu_state = malloc(sizeof(struct pmc_pcpu_state)*mp_ncpus, M_PMC, M_WAITOK|M_ZERO); 22364a3690dfSJohn Baldwin PMCDBG1(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 2237ebccf1e3SJoseph Koshy 2238ebccf1e3SJoseph Koshy return pmc; 2239ebccf1e3SJoseph Koshy } 2240ebccf1e3SJoseph Koshy 2241ebccf1e3SJoseph Koshy /* 2242ebccf1e3SJoseph Koshy * Destroy a pmc descriptor. 2243ebccf1e3SJoseph Koshy */ 2244ebccf1e3SJoseph Koshy 2245ebccf1e3SJoseph Koshy static void 2246ebccf1e3SJoseph Koshy pmc_destroy_pmc_descriptor(struct pmc *pm) 2247ebccf1e3SJoseph Koshy { 2248ebccf1e3SJoseph Koshy 2249ebccf1e3SJoseph Koshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 2250ebccf1e3SJoseph Koshy pm->pm_state == PMC_STATE_FREE, 2251ebccf1e3SJoseph Koshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 2252ebccf1e3SJoseph Koshy KASSERT(LIST_EMPTY(&pm->pm_targets), 2253ebccf1e3SJoseph Koshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 2254ebccf1e3SJoseph Koshy KASSERT(pm->pm_owner == NULL, 2255ebccf1e3SJoseph Koshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 2256e6b475e0SMatt Macy KASSERT(counter_u64_fetch(pm->pm_runcount) == 0, 2257e6b475e0SMatt Macy ("[pmc,%d] pmc has non-zero run count %ld", __LINE__, 2258e6b475e0SMatt Macy (unsigned long)counter_u64_fetch(pm->pm_runcount))); 225906796b67SMark Johnston 2260e6b475e0SMatt Macy counter_u64_free(pm->pm_runcount); 2261e6b475e0SMatt Macy free(pm->pm_pcpu_state, M_PMC); 226206796b67SMark Johnston free(pm, M_PMC); 2263ebccf1e3SJoseph Koshy } 2264ebccf1e3SJoseph Koshy 2265f263522aSJoseph Koshy static void 2266f263522aSJoseph Koshy pmc_wait_for_pmc_idle(struct pmc *pm) 2267f263522aSJoseph Koshy { 2268680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 2269f263522aSJoseph Koshy volatile int maxloop; 2270f263522aSJoseph Koshy 2271122ccdc1SJoseph Koshy maxloop = 100 * pmc_cpu_max(); 2272f263522aSJoseph Koshy #endif 2273f263522aSJoseph Koshy /* 2274f263522aSJoseph Koshy * Loop (with a forced context switch) till the PMC's runcount 2275f263522aSJoseph Koshy * comes down to zero. 2276f263522aSJoseph Koshy */ 2277e6b475e0SMatt Macy while (counter_u64_fetch(pm->pm_runcount) > 0) { 2278680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 2279f263522aSJoseph Koshy maxloop--; 2280f263522aSJoseph Koshy KASSERT(maxloop > 0, 2281e6b475e0SMatt Macy ("[pmc,%d] (ri%d, rc%ld) waiting too long for " 2282f263522aSJoseph Koshy "pmc to be free", __LINE__, 2283e6b475e0SMatt Macy PMC_TO_ROWINDEX(pm), (unsigned long)counter_u64_fetch(pm->pm_runcount))); 2284f263522aSJoseph Koshy #endif 2285f263522aSJoseph Koshy pmc_force_context_switch(); 2286f263522aSJoseph Koshy } 2287f263522aSJoseph Koshy } 2288f263522aSJoseph Koshy 2289ebccf1e3SJoseph Koshy /* 2290ebccf1e3SJoseph Koshy * This function does the following things: 2291ebccf1e3SJoseph Koshy * 2292ebccf1e3SJoseph Koshy * - detaches the PMC from hardware 2293ebccf1e3SJoseph Koshy * - unlinks all target threads that were attached to it 2294ebccf1e3SJoseph Koshy * - removes the PMC from its owner's list 229506796b67SMark Johnston * - destroys the PMC private mutex 2296ebccf1e3SJoseph Koshy * 229706796b67SMark Johnston * Once this function completes, the given pmc pointer can be freed by 229806796b67SMark Johnston * calling pmc_destroy_pmc_descriptor(). 2299ebccf1e3SJoseph Koshy */ 2300ebccf1e3SJoseph Koshy 2301ebccf1e3SJoseph Koshy static void 2302ebccf1e3SJoseph Koshy pmc_release_pmc_descriptor(struct pmc *pm) 2303ebccf1e3SJoseph Koshy { 2304c5153e19SJoseph Koshy enum pmc_mode mode; 2305ebccf1e3SJoseph Koshy struct pmc_hw *phw; 2306e829eb6dSJoseph Koshy u_int adjri, ri, cpu; 2307f263522aSJoseph Koshy struct pmc_owner *po; 2308ebccf1e3SJoseph Koshy struct pmc_binding pb; 2309e829eb6dSJoseph Koshy struct pmc_process *pp; 2310e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 2311e829eb6dSJoseph Koshy struct pmc_target *ptgt, *tmp; 2312ebccf1e3SJoseph Koshy 2313ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 2314ebccf1e3SJoseph Koshy 2315ebccf1e3SJoseph Koshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 2316ebccf1e3SJoseph Koshy 2317c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 2318e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2319c5153e19SJoseph Koshy mode = PMC_TO_MODE(pm); 2320ebccf1e3SJoseph Koshy 23214a3690dfSJohn Baldwin PMCDBG3(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 2322c5153e19SJoseph Koshy mode); 2323ebccf1e3SJoseph Koshy 2324ebccf1e3SJoseph Koshy /* 2325ebccf1e3SJoseph Koshy * First, we take the PMC off hardware. 2326ebccf1e3SJoseph Koshy */ 2327869f4a8bSWarner Losh cpu = 0; 2328c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) { 2329ebccf1e3SJoseph Koshy 2330ebccf1e3SJoseph Koshy /* 2331ebccf1e3SJoseph Koshy * A system mode PMC runs on a specific CPU. Switch 2332ebccf1e3SJoseph Koshy * to this CPU and turn hardware off. 2333ebccf1e3SJoseph Koshy */ 2334ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 2335ebccf1e3SJoseph Koshy 2336c5153e19SJoseph Koshy cpu = PMC_TO_CPU(pm); 2337ebccf1e3SJoseph Koshy 2338ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 2339ebccf1e3SJoseph Koshy 2340f263522aSJoseph Koshy /* switch off non-stalled CPUs */ 2341e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_cpustate = 0; 2342f263522aSJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING && 2343e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_stalled == 0) { 2344f263522aSJoseph Koshy 2345ebccf1e3SJoseph Koshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 2346ebccf1e3SJoseph Koshy 2347ebccf1e3SJoseph Koshy KASSERT(phw->phw_pmc == pm, 2348ebccf1e3SJoseph Koshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 2349ebccf1e3SJoseph Koshy __LINE__, ri, phw->phw_pmc, pm)); 23504a3690dfSJohn Baldwin PMCDBG2(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 2351ebccf1e3SJoseph Koshy 2352ebccf1e3SJoseph Koshy critical_enter(); 2353e829eb6dSJoseph Koshy pcd->pcd_stop_pmc(cpu, adjri); 2354ebccf1e3SJoseph Koshy critical_exit(); 2355ebccf1e3SJoseph Koshy } 2356ebccf1e3SJoseph Koshy 23574a3690dfSJohn Baldwin PMCDBG2(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 2358ebccf1e3SJoseph Koshy 2359ebccf1e3SJoseph Koshy critical_enter(); 2360e829eb6dSJoseph Koshy pcd->pcd_config_pmc(cpu, adjri, NULL); 2361ebccf1e3SJoseph Koshy critical_exit(); 2362ebccf1e3SJoseph Koshy 2363f263522aSJoseph Koshy /* adjust the global and process count of SS mode PMCs */ 2364f263522aSJoseph Koshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 2365f263522aSJoseph Koshy po = pm->pm_owner; 2366f263522aSJoseph Koshy po->po_sscount--; 2367f263522aSJoseph Koshy if (po->po_sscount == 0) { 2368f263522aSJoseph Koshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2369*0f00315cSMatt Macy CK_LIST_REMOVE(po, po_ssnext); 2370*0f00315cSMatt Macy epoch_wait(global_epoch); 2371f263522aSJoseph Koshy } 2372f263522aSJoseph Koshy } 2373f263522aSJoseph Koshy 2374ebccf1e3SJoseph Koshy pm->pm_state = PMC_STATE_DELETED; 2375ebccf1e3SJoseph Koshy 2376ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 2377ebccf1e3SJoseph Koshy 2378f263522aSJoseph Koshy /* 2379f263522aSJoseph Koshy * We could have references to this PMC structure in 2380f263522aSJoseph Koshy * the per-cpu sample queues. Wait for the queue to 2381f263522aSJoseph Koshy * drain. 2382f263522aSJoseph Koshy */ 2383f263522aSJoseph Koshy pmc_wait_for_pmc_idle(pm); 2384f263522aSJoseph Koshy 2385c5153e19SJoseph Koshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 2386ebccf1e3SJoseph Koshy 2387ebccf1e3SJoseph Koshy /* 2388ebccf1e3SJoseph Koshy * A virtual PMC could be running on multiple CPUs at 2389ebccf1e3SJoseph Koshy * a given instant. 2390ebccf1e3SJoseph Koshy * 2391ebccf1e3SJoseph Koshy * By marking its state as DELETED, we ensure that 2392ebccf1e3SJoseph Koshy * this PMC is never further scheduled on hardware. 2393ebccf1e3SJoseph Koshy * 2394ebccf1e3SJoseph Koshy * Then we wait till all CPUs are done with this PMC. 2395ebccf1e3SJoseph Koshy */ 2396ebccf1e3SJoseph Koshy pm->pm_state = PMC_STATE_DELETED; 2397ebccf1e3SJoseph Koshy 2398ebccf1e3SJoseph Koshy 2399f263522aSJoseph Koshy /* Wait for the PMCs runcount to come to zero. */ 2400f263522aSJoseph Koshy pmc_wait_for_pmc_idle(pm); 2401ebccf1e3SJoseph Koshy 2402ebccf1e3SJoseph Koshy /* 2403ebccf1e3SJoseph Koshy * At this point the PMC is off all CPUs and cannot be 2404ebccf1e3SJoseph Koshy * freshly scheduled onto a CPU. It is now safe to 2405ebccf1e3SJoseph Koshy * unlink all targets from this PMC. If a 2406ebccf1e3SJoseph Koshy * process-record's refcount falls to zero, we remove 2407ebccf1e3SJoseph Koshy * it from the hash table. The module-wide SX lock 2408ebccf1e3SJoseph Koshy * protects us from races. 2409ebccf1e3SJoseph Koshy */ 2410ebccf1e3SJoseph Koshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 2411ebccf1e3SJoseph Koshy pp = ptgt->pt_process; 2412ebccf1e3SJoseph Koshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 2413ebccf1e3SJoseph Koshy 24144a3690dfSJohn Baldwin PMCDBG1(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 2415ebccf1e3SJoseph Koshy 2416ebccf1e3SJoseph Koshy /* 2417ebccf1e3SJoseph Koshy * If the target process record shows that no 2418ebccf1e3SJoseph Koshy * PMCs are attached to it, reclaim its space. 2419ebccf1e3SJoseph Koshy */ 2420ebccf1e3SJoseph Koshy 2421ebccf1e3SJoseph Koshy if (pp->pp_refcnt == 0) { 2422ebccf1e3SJoseph Koshy pmc_remove_process_descriptor(pp); 24231ede983cSDag-Erling Smørgrav free(pp, M_PMC); 2424ebccf1e3SJoseph Koshy } 2425ebccf1e3SJoseph Koshy } 2426ebccf1e3SJoseph Koshy 2427ebccf1e3SJoseph Koshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 2428ebccf1e3SJoseph Koshy 2429ebccf1e3SJoseph Koshy } 2430ebccf1e3SJoseph Koshy 2431ebccf1e3SJoseph Koshy /* 2432ebccf1e3SJoseph Koshy * Release any MD resources 2433ebccf1e3SJoseph Koshy */ 2434e829eb6dSJoseph Koshy (void) pcd->pcd_release_pmc(cpu, adjri, pm); 2435ebccf1e3SJoseph Koshy 2436ebccf1e3SJoseph Koshy /* 2437ebccf1e3SJoseph Koshy * Update row disposition 2438ebccf1e3SJoseph Koshy */ 2439ebccf1e3SJoseph Koshy 2440c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 2441ebccf1e3SJoseph Koshy PMC_UNMARK_ROW_STANDALONE(ri); 2442ebccf1e3SJoseph Koshy else 2443ebccf1e3SJoseph Koshy PMC_UNMARK_ROW_THREAD(ri); 2444ebccf1e3SJoseph Koshy 2445ebccf1e3SJoseph Koshy /* unlink from the owner's list */ 2446f263522aSJoseph Koshy if (pm->pm_owner) { 2447f263522aSJoseph Koshy LIST_REMOVE(pm, pm_next); 2448f263522aSJoseph Koshy pm->pm_owner = NULL; 2449f263522aSJoseph Koshy } 2450ebccf1e3SJoseph Koshy } 2451ebccf1e3SJoseph Koshy 2452ebccf1e3SJoseph Koshy /* 2453ebccf1e3SJoseph Koshy * Register an owner and a pmc. 2454ebccf1e3SJoseph Koshy */ 2455ebccf1e3SJoseph Koshy 2456ebccf1e3SJoseph Koshy static int 2457ebccf1e3SJoseph Koshy pmc_register_owner(struct proc *p, struct pmc *pmc) 2458ebccf1e3SJoseph Koshy { 2459ebccf1e3SJoseph Koshy struct pmc_owner *po; 2460ebccf1e3SJoseph Koshy 2461ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 2462ebccf1e3SJoseph Koshy 2463c5153e19SJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2464f263522aSJoseph Koshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 2465ebccf1e3SJoseph Koshy return ENOMEM; 2466ebccf1e3SJoseph Koshy 2467ebccf1e3SJoseph Koshy KASSERT(pmc->pm_owner == NULL, 2468ebccf1e3SJoseph Koshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 2469ebccf1e3SJoseph Koshy pmc->pm_owner = po; 2470ebccf1e3SJoseph Koshy 2471f263522aSJoseph Koshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 2472ebccf1e3SJoseph Koshy 2473ebccf1e3SJoseph Koshy PROC_LOCK(p); 2474ebccf1e3SJoseph Koshy p->p_flag |= P_HWPMC; 2475ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 2476ebccf1e3SJoseph Koshy 2477f263522aSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 2478f263522aSJoseph Koshy pmclog_process_pmcallocate(pmc); 2479f263522aSJoseph Koshy 24804a3690dfSJohn Baldwin PMCDBG2(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 2481f263522aSJoseph Koshy po, pmc); 2482ebccf1e3SJoseph Koshy 2483ebccf1e3SJoseph Koshy return 0; 2484ebccf1e3SJoseph Koshy } 2485ebccf1e3SJoseph Koshy 2486ebccf1e3SJoseph Koshy /* 2487ebccf1e3SJoseph Koshy * Return the current row disposition: 2488ebccf1e3SJoseph Koshy * == 0 => FREE 2489ebccf1e3SJoseph Koshy * > 0 => PROCESS MODE 2490ebccf1e3SJoseph Koshy * < 0 => SYSTEM MODE 2491ebccf1e3SJoseph Koshy */ 2492ebccf1e3SJoseph Koshy 2493ebccf1e3SJoseph Koshy int 2494ebccf1e3SJoseph Koshy pmc_getrowdisp(int ri) 2495ebccf1e3SJoseph Koshy { 2496ebccf1e3SJoseph Koshy return pmc_pmcdisp[ri]; 2497ebccf1e3SJoseph Koshy } 2498ebccf1e3SJoseph Koshy 2499ebccf1e3SJoseph Koshy /* 2500ebccf1e3SJoseph Koshy * Check if a PMC at row index 'ri' can be allocated to the current 2501ebccf1e3SJoseph Koshy * process. 2502ebccf1e3SJoseph Koshy * 2503ebccf1e3SJoseph Koshy * Allocation can fail if: 2504ebccf1e3SJoseph Koshy * - the current process is already being profiled by a PMC at index 'ri', 2505ebccf1e3SJoseph Koshy * attached to it via OP_PMCATTACH. 2506ebccf1e3SJoseph Koshy * - the current process has already allocated a PMC at index 'ri' 2507ebccf1e3SJoseph Koshy * via OP_ALLOCATE. 2508ebccf1e3SJoseph Koshy */ 2509ebccf1e3SJoseph Koshy 2510ebccf1e3SJoseph Koshy static int 2511c5153e19SJoseph Koshy pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2512ebccf1e3SJoseph Koshy { 2513c5153e19SJoseph Koshy enum pmc_mode mode; 2514c5153e19SJoseph Koshy struct pmc *pm; 2515ebccf1e3SJoseph Koshy struct pmc_owner *po; 2516ebccf1e3SJoseph Koshy struct pmc_process *pp; 2517ebccf1e3SJoseph Koshy 25184a3690dfSJohn Baldwin PMCDBG5(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2519c5153e19SJoseph Koshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2520ebccf1e3SJoseph Koshy 2521c5153e19SJoseph Koshy /* 2522c5153e19SJoseph Koshy * We shouldn't have already allocated a process-mode PMC at 2523c5153e19SJoseph Koshy * row index 'ri'. 2524c5153e19SJoseph Koshy * 2525c5153e19SJoseph Koshy * We shouldn't have allocated a system-wide PMC on the same 2526c5153e19SJoseph Koshy * CPU and same RI. 2527c5153e19SJoseph Koshy */ 2528ebccf1e3SJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2529f263522aSJoseph Koshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2530c5153e19SJoseph Koshy if (PMC_TO_ROWINDEX(pm) == ri) { 2531c5153e19SJoseph Koshy mode = PMC_TO_MODE(pm); 2532c5153e19SJoseph Koshy if (PMC_IS_VIRTUAL_MODE(mode)) 2533ebccf1e3SJoseph Koshy return EEXIST; 2534c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode) && 2535c5153e19SJoseph Koshy (int) PMC_TO_CPU(pm) == cpu) 2536c5153e19SJoseph Koshy return EEXIST; 2537c5153e19SJoseph Koshy } 2538c5153e19SJoseph Koshy } 2539ebccf1e3SJoseph Koshy 2540c5153e19SJoseph Koshy /* 2541c5153e19SJoseph Koshy * We also shouldn't be the target of any PMC at this index 2542c5153e19SJoseph Koshy * since otherwise a PMC_ATTACH to ourselves will fail. 2543c5153e19SJoseph Koshy */ 2544ebccf1e3SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2545ebccf1e3SJoseph Koshy if (pp->pp_pmcs[ri].pp_pmc) 2546ebccf1e3SJoseph Koshy return EEXIST; 2547ebccf1e3SJoseph Koshy 25484a3690dfSJohn Baldwin PMCDBG4(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2549ebccf1e3SJoseph Koshy p, p->p_pid, p->p_comm, ri); 2550ebccf1e3SJoseph Koshy 2551ebccf1e3SJoseph Koshy return 0; 2552ebccf1e3SJoseph Koshy } 2553ebccf1e3SJoseph Koshy 2554ebccf1e3SJoseph Koshy /* 2555ebccf1e3SJoseph Koshy * Check if a given PMC at row index 'ri' can be currently used in 2556ebccf1e3SJoseph Koshy * mode 'mode'. 2557ebccf1e3SJoseph Koshy */ 2558ebccf1e3SJoseph Koshy 2559ebccf1e3SJoseph Koshy static int 2560ebccf1e3SJoseph Koshy pmc_can_allocate_row(int ri, enum pmc_mode mode) 2561ebccf1e3SJoseph Koshy { 2562ebccf1e3SJoseph Koshy enum pmc_disp disp; 2563ebccf1e3SJoseph Koshy 2564ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 2565ebccf1e3SJoseph Koshy 25664a3690dfSJohn Baldwin PMCDBG2(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2567ebccf1e3SJoseph Koshy 2568ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) 2569ebccf1e3SJoseph Koshy disp = PMC_DISP_STANDALONE; 2570ebccf1e3SJoseph Koshy else 2571ebccf1e3SJoseph Koshy disp = PMC_DISP_THREAD; 2572ebccf1e3SJoseph Koshy 2573ebccf1e3SJoseph Koshy /* 2574ebccf1e3SJoseph Koshy * check disposition for PMC row 'ri': 2575ebccf1e3SJoseph Koshy * 2576ebccf1e3SJoseph Koshy * Expected disposition Row-disposition Result 2577ebccf1e3SJoseph Koshy * 2578ebccf1e3SJoseph Koshy * STANDALONE STANDALONE or FREE proceed 2579ebccf1e3SJoseph Koshy * STANDALONE THREAD fail 2580ebccf1e3SJoseph Koshy * THREAD THREAD or FREE proceed 2581ebccf1e3SJoseph Koshy * THREAD STANDALONE fail 2582ebccf1e3SJoseph Koshy */ 2583ebccf1e3SJoseph Koshy 2584ebccf1e3SJoseph Koshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2585ebccf1e3SJoseph Koshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2586ebccf1e3SJoseph Koshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2587ebccf1e3SJoseph Koshy return EBUSY; 2588ebccf1e3SJoseph Koshy 2589ebccf1e3SJoseph Koshy /* 2590ebccf1e3SJoseph Koshy * All OK 2591ebccf1e3SJoseph Koshy */ 2592ebccf1e3SJoseph Koshy 25934a3690dfSJohn Baldwin PMCDBG2(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2594ebccf1e3SJoseph Koshy 2595ebccf1e3SJoseph Koshy return 0; 2596ebccf1e3SJoseph Koshy 2597ebccf1e3SJoseph Koshy } 2598ebccf1e3SJoseph Koshy 2599ebccf1e3SJoseph Koshy /* 2600c5153e19SJoseph Koshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2601ebccf1e3SJoseph Koshy */ 2602ebccf1e3SJoseph Koshy 2603ebccf1e3SJoseph Koshy static struct pmc * 2604ebccf1e3SJoseph Koshy pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2605ebccf1e3SJoseph Koshy { 2606f263522aSJoseph Koshy struct pmc *pm; 2607ebccf1e3SJoseph Koshy 2608c5153e19SJoseph Koshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2609c5153e19SJoseph Koshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2610c5153e19SJoseph Koshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2611ebccf1e3SJoseph Koshy 2612f263522aSJoseph Koshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2613f263522aSJoseph Koshy if (pm->pm_id == pmcid) 2614f263522aSJoseph Koshy return pm; 2615ebccf1e3SJoseph Koshy 2616ebccf1e3SJoseph Koshy return NULL; 2617ebccf1e3SJoseph Koshy } 2618ebccf1e3SJoseph Koshy 2619ebccf1e3SJoseph Koshy static int 2620ebccf1e3SJoseph Koshy pmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2621ebccf1e3SJoseph Koshy { 2622ebccf1e3SJoseph Koshy 2623e6f47577SBjoern A. Zeeb struct pmc *pm, *opm; 2624ebccf1e3SJoseph Koshy struct pmc_owner *po; 2625e6f47577SBjoern A. Zeeb struct pmc_process *pp; 2626ebccf1e3SJoseph Koshy 26274a3690dfSJohn Baldwin PMCDBG1(PMC,FND,1, "find-pmc id=%d", pmcid); 2628d2cd6388SKonstantin Belousov if (PMC_ID_TO_ROWINDEX(pmcid) >= md->pmd_npmc) 2629d2cd6388SKonstantin Belousov return (EINVAL); 2630ebccf1e3SJoseph Koshy 2631e6f47577SBjoern A. Zeeb if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) { 2632e6f47577SBjoern A. Zeeb /* 2633e6f47577SBjoern A. Zeeb * In case of PMC_F_DESCENDANTS child processes we will not find 2634e6f47577SBjoern A. Zeeb * the current process in the owners hash list. Find the owner 2635e6f47577SBjoern A. Zeeb * process first and from there lookup the po. 2636e6f47577SBjoern A. Zeeb */ 2637e6f47577SBjoern A. Zeeb if ((pp = pmc_find_process_descriptor(curthread->td_proc, 2638e6f47577SBjoern A. Zeeb PMC_FLAG_NONE)) == NULL) { 2639ebccf1e3SJoseph Koshy return ESRCH; 2640e6f47577SBjoern A. Zeeb } else { 2641e6f47577SBjoern A. Zeeb opm = pp->pp_pmcs[PMC_ID_TO_ROWINDEX(pmcid)].pp_pmc; 2642e6f47577SBjoern A. Zeeb if (opm == NULL) 2643e6f47577SBjoern A. Zeeb return ESRCH; 2644e6f47577SBjoern A. Zeeb if ((opm->pm_flags & (PMC_F_ATTACHED_TO_OWNER| 2645e6f47577SBjoern A. Zeeb PMC_F_DESCENDANTS)) != (PMC_F_ATTACHED_TO_OWNER| 2646e6f47577SBjoern A. Zeeb PMC_F_DESCENDANTS)) 2647e6f47577SBjoern A. Zeeb return ESRCH; 2648e6f47577SBjoern A. Zeeb po = opm->pm_owner; 2649e6f47577SBjoern A. Zeeb } 2650e6f47577SBjoern A. Zeeb } 2651ebccf1e3SJoseph Koshy 2652ebccf1e3SJoseph Koshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2653ebccf1e3SJoseph Koshy return EINVAL; 2654ebccf1e3SJoseph Koshy 26554a3690dfSJohn Baldwin PMCDBG2(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2656ebccf1e3SJoseph Koshy 2657ebccf1e3SJoseph Koshy *pmc = pm; 2658ebccf1e3SJoseph Koshy return 0; 2659ebccf1e3SJoseph Koshy } 2660ebccf1e3SJoseph Koshy 2661ebccf1e3SJoseph Koshy /* 2662ebccf1e3SJoseph Koshy * Start a PMC. 2663ebccf1e3SJoseph Koshy */ 2664ebccf1e3SJoseph Koshy 2665ebccf1e3SJoseph Koshy static int 2666ebccf1e3SJoseph Koshy pmc_start(struct pmc *pm) 2667ebccf1e3SJoseph Koshy { 2668c5153e19SJoseph Koshy enum pmc_mode mode; 2669f263522aSJoseph Koshy struct pmc_owner *po; 2670ebccf1e3SJoseph Koshy struct pmc_binding pb; 2671e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 2672e829eb6dSJoseph Koshy int adjri, error, cpu, ri; 2673ebccf1e3SJoseph Koshy 2674ebccf1e3SJoseph Koshy KASSERT(pm != NULL, 2675ebccf1e3SJoseph Koshy ("[pmc,%d] null pm", __LINE__)); 2676ebccf1e3SJoseph Koshy 2677c5153e19SJoseph Koshy mode = PMC_TO_MODE(pm); 2678c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 2679e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2680e829eb6dSJoseph Koshy 2681c5153e19SJoseph Koshy error = 0; 2682c5153e19SJoseph Koshy 26834a3690dfSJohn Baldwin PMCDBG3(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2684ebccf1e3SJoseph Koshy 2685f263522aSJoseph Koshy po = pm->pm_owner; 2686ebccf1e3SJoseph Koshy 2687d07f36b0SJoseph Koshy /* 2688d07f36b0SJoseph Koshy * Disallow PMCSTART if a logfile is required but has not been 2689d07f36b0SJoseph Koshy * configured yet. 2690d07f36b0SJoseph Koshy */ 2691d07f36b0SJoseph Koshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2692d07f36b0SJoseph Koshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2693e829eb6dSJoseph Koshy return (EDOOFUS); /* programming error */ 2694d07f36b0SJoseph Koshy 2695d07f36b0SJoseph Koshy /* 2696d07f36b0SJoseph Koshy * If this is a sampling mode PMC, log mapping information for 2697d07f36b0SJoseph Koshy * the kernel modules that are currently loaded. 2698d07f36b0SJoseph Koshy */ 2699d07f36b0SJoseph Koshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2700d07f36b0SJoseph Koshy pmc_log_kernel_mappings(pm); 2701d07f36b0SJoseph Koshy 2702c5153e19SJoseph Koshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2703ebccf1e3SJoseph Koshy 2704ebccf1e3SJoseph Koshy /* 2705f263522aSJoseph Koshy * If a PMCATTACH has never been done on this PMC, 2706f263522aSJoseph Koshy * attach it to its owner process. 2707ebccf1e3SJoseph Koshy */ 2708ebccf1e3SJoseph Koshy 2709ebccf1e3SJoseph Koshy if (LIST_EMPTY(&pm->pm_targets)) 2710f263522aSJoseph Koshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2711f263522aSJoseph Koshy pmc_attach_process(po->po_owner, pm); 2712f263522aSJoseph Koshy 2713f263522aSJoseph Koshy /* 2714c5153e19SJoseph Koshy * If the PMC is attached to its owner, then force a context 2715c5153e19SJoseph Koshy * switch to ensure that the MD state gets set correctly. 2716c5153e19SJoseph Koshy */ 2717ebccf1e3SJoseph Koshy 2718f263522aSJoseph Koshy if (error == 0) { 2719f263522aSJoseph Koshy pm->pm_state = PMC_STATE_RUNNING; 2720f263522aSJoseph Koshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2721f263522aSJoseph Koshy pmc_force_context_switch(); 2722f263522aSJoseph Koshy } 2723ebccf1e3SJoseph Koshy 2724e829eb6dSJoseph Koshy return (error); 2725f263522aSJoseph Koshy } 2726ebccf1e3SJoseph Koshy 2727f263522aSJoseph Koshy 2728f263522aSJoseph Koshy /* 2729f263522aSJoseph Koshy * A system-wide PMC. 2730d07f36b0SJoseph Koshy * 2731f263522aSJoseph Koshy * Add the owner to the global list if this is a system-wide 2732f263522aSJoseph Koshy * sampling PMC. 2733f263522aSJoseph Koshy */ 2734f263522aSJoseph Koshy 2735f263522aSJoseph Koshy if (mode == PMC_MODE_SS) { 2736f263522aSJoseph Koshy if (po->po_sscount == 0) { 2737*0f00315cSMatt Macy CK_LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2738f263522aSJoseph Koshy atomic_add_rel_int(&pmc_ss_count, 1); 27394a3690dfSJohn Baldwin PMCDBG1(PMC,OPS,1, "po=%p in global list", po); 2740f263522aSJoseph Koshy } 2741f263522aSJoseph Koshy po->po_sscount++; 2742ebccf1e3SJoseph Koshy 2743bf792d68SJoseph Koshy /* 2744bf792d68SJoseph Koshy * Log mapping information for all existing processes in the 2745bf792d68SJoseph Koshy * system. Subsequent mappings are logged as they happen; 2746bf792d68SJoseph Koshy * see pmc_process_mmap(). 2747bf792d68SJoseph Koshy */ 2748bf792d68SJoseph Koshy if (po->po_logprocmaps == 0) { 2749d07f36b0SJoseph Koshy pmc_log_all_process_mappings(po); 2750bf792d68SJoseph Koshy po->po_logprocmaps = 1; 2751bf792d68SJoseph Koshy } 275204001891SRyan Stone } 275349874f6eSJoseph Koshy 2754ebccf1e3SJoseph Koshy /* 2755f263522aSJoseph Koshy * Move to the CPU associated with this 2756ebccf1e3SJoseph Koshy * PMC, and start the hardware. 2757ebccf1e3SJoseph Koshy */ 2758ebccf1e3SJoseph Koshy 2759ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 2760ebccf1e3SJoseph Koshy 2761c5153e19SJoseph Koshy cpu = PMC_TO_CPU(pm); 2762ebccf1e3SJoseph Koshy 2763122ccdc1SJoseph Koshy if (!pmc_cpu_is_active(cpu)) 2764e829eb6dSJoseph Koshy return (ENXIO); 2765ebccf1e3SJoseph Koshy 2766ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 2767ebccf1e3SJoseph Koshy 2768ebccf1e3SJoseph Koshy /* 2769ebccf1e3SJoseph Koshy * global PMCs are configured at allocation time 2770ebccf1e3SJoseph Koshy * so write out the initial value and start the PMC. 2771ebccf1e3SJoseph Koshy */ 2772ebccf1e3SJoseph Koshy 2773f263522aSJoseph Koshy pm->pm_state = PMC_STATE_RUNNING; 2774f263522aSJoseph Koshy 2775c5153e19SJoseph Koshy critical_enter(); 2776e829eb6dSJoseph Koshy if ((error = pcd->pcd_write_pmc(cpu, adjri, 2777c5153e19SJoseph Koshy PMC_IS_SAMPLING_MODE(mode) ? 2778ebccf1e3SJoseph Koshy pm->pm_sc.pm_reloadcount : 2779a3924968SJonathan T. Looney pm->pm_sc.pm_initial)) == 0) { 2780a3924968SJonathan T. Looney /* If a sampling mode PMC, reset stalled state. */ 2781a3924968SJonathan T. Looney if (PMC_IS_SAMPLING_MODE(mode)) 2782e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_stalled = 0; 2783a3924968SJonathan T. Looney 2784a3924968SJonathan T. Looney /* Indicate that we desire this to run. Start it. */ 2785e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_cpustate = 1; 2786e829eb6dSJoseph Koshy error = pcd->pcd_start_pmc(cpu, adjri); 2787a3924968SJonathan T. Looney } 2788c5153e19SJoseph Koshy critical_exit(); 2789ebccf1e3SJoseph Koshy 2790ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 2791ebccf1e3SJoseph Koshy 2792e829eb6dSJoseph Koshy return (error); 2793ebccf1e3SJoseph Koshy } 2794ebccf1e3SJoseph Koshy 2795ebccf1e3SJoseph Koshy /* 2796ebccf1e3SJoseph Koshy * Stop a PMC. 2797ebccf1e3SJoseph Koshy */ 2798ebccf1e3SJoseph Koshy 2799ebccf1e3SJoseph Koshy static int 2800ebccf1e3SJoseph Koshy pmc_stop(struct pmc *pm) 2801ebccf1e3SJoseph Koshy { 2802f263522aSJoseph Koshy struct pmc_owner *po; 2803ebccf1e3SJoseph Koshy struct pmc_binding pb; 2804e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 2805e829eb6dSJoseph Koshy int adjri, cpu, error, ri; 2806ebccf1e3SJoseph Koshy 2807ebccf1e3SJoseph Koshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2808ebccf1e3SJoseph Koshy 28094a3690dfSJohn Baldwin PMCDBG3(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2810c5153e19SJoseph Koshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2811ebccf1e3SJoseph Koshy 2812ebccf1e3SJoseph Koshy pm->pm_state = PMC_STATE_STOPPED; 2813ebccf1e3SJoseph Koshy 2814ebccf1e3SJoseph Koshy /* 2815ebccf1e3SJoseph Koshy * If the PMC is a virtual mode one, changing the state to 2816ebccf1e3SJoseph Koshy * non-RUNNING is enough to ensure that the PMC never gets 2817ebccf1e3SJoseph Koshy * scheduled. 2818ebccf1e3SJoseph Koshy * 2819ebccf1e3SJoseph Koshy * If this PMC is current running on a CPU, then it will 2820ebccf1e3SJoseph Koshy * handled correctly at the time its target process is context 2821ebccf1e3SJoseph Koshy * switched out. 2822ebccf1e3SJoseph Koshy */ 2823ebccf1e3SJoseph Koshy 2824c5153e19SJoseph Koshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2825ebccf1e3SJoseph Koshy return 0; 2826ebccf1e3SJoseph Koshy 2827ebccf1e3SJoseph Koshy /* 2828ebccf1e3SJoseph Koshy * A system-mode PMC. Move to the CPU associated with 2829ebccf1e3SJoseph Koshy * this PMC, and stop the hardware. We update the 2830ebccf1e3SJoseph Koshy * 'initial count' so that a subsequent PMCSTART will 2831ebccf1e3SJoseph Koshy * resume counting from the current hardware count. 2832ebccf1e3SJoseph Koshy */ 2833ebccf1e3SJoseph Koshy 2834ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 2835ebccf1e3SJoseph Koshy 2836c5153e19SJoseph Koshy cpu = PMC_TO_CPU(pm); 2837c5153e19SJoseph Koshy 2838122ccdc1SJoseph Koshy KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 2839c5153e19SJoseph Koshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2840ebccf1e3SJoseph Koshy 2841122ccdc1SJoseph Koshy if (!pmc_cpu_is_active(cpu)) 2842ebccf1e3SJoseph Koshy return ENXIO; 2843ebccf1e3SJoseph Koshy 2844ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 2845ebccf1e3SJoseph Koshy 2846c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 2847e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 2848c5153e19SJoseph Koshy 2849e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_cpustate = 0; 2850c5153e19SJoseph Koshy critical_enter(); 2851e829eb6dSJoseph Koshy if ((error = pcd->pcd_stop_pmc(cpu, adjri)) == 0) 2852e829eb6dSJoseph Koshy error = pcd->pcd_read_pmc(cpu, adjri, &pm->pm_sc.pm_initial); 2853c5153e19SJoseph Koshy critical_exit(); 2854ebccf1e3SJoseph Koshy 2855ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 2856ebccf1e3SJoseph Koshy 2857f263522aSJoseph Koshy po = pm->pm_owner; 2858f263522aSJoseph Koshy 2859f263522aSJoseph Koshy /* remove this owner from the global list of SS PMC owners */ 2860f263522aSJoseph Koshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2861f263522aSJoseph Koshy po->po_sscount--; 2862f263522aSJoseph Koshy if (po->po_sscount == 0) { 2863f263522aSJoseph Koshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2864*0f00315cSMatt Macy CK_LIST_REMOVE(po, po_ssnext); 2865*0f00315cSMatt Macy epoch_wait(global_epoch); 28664a3690dfSJohn Baldwin PMCDBG1(PMC,OPS,2,"po=%p removed from global list", po); 2867f263522aSJoseph Koshy } 2868f263522aSJoseph Koshy } 2869f263522aSJoseph Koshy 2870e829eb6dSJoseph Koshy return (error); 2871ebccf1e3SJoseph Koshy } 2872ebccf1e3SJoseph Koshy 2873ebccf1e3SJoseph Koshy 2874680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 2875ebccf1e3SJoseph Koshy static const char *pmc_op_to_name[] = { 2876ebccf1e3SJoseph Koshy #undef __PMC_OP 2877ebccf1e3SJoseph Koshy #define __PMC_OP(N, D) #N , 2878ebccf1e3SJoseph Koshy __PMC_OPS() 2879ebccf1e3SJoseph Koshy NULL 2880ebccf1e3SJoseph Koshy }; 2881ebccf1e3SJoseph Koshy #endif 2882ebccf1e3SJoseph Koshy 2883ebccf1e3SJoseph Koshy /* 2884ebccf1e3SJoseph Koshy * The syscall interface 2885ebccf1e3SJoseph Koshy */ 2886ebccf1e3SJoseph Koshy 2887ebccf1e3SJoseph Koshy #define PMC_GET_SX_XLOCK(...) do { \ 2888ebccf1e3SJoseph Koshy sx_xlock(&pmc_sx); \ 2889ebccf1e3SJoseph Koshy if (pmc_hook == NULL) { \ 2890ebccf1e3SJoseph Koshy sx_xunlock(&pmc_sx); \ 2891ebccf1e3SJoseph Koshy return __VA_ARGS__; \ 2892ebccf1e3SJoseph Koshy } \ 2893ebccf1e3SJoseph Koshy } while (0) 2894ebccf1e3SJoseph Koshy 2895ebccf1e3SJoseph Koshy #define PMC_DOWNGRADE_SX() do { \ 2896ebccf1e3SJoseph Koshy sx_downgrade(&pmc_sx); \ 2897ebccf1e3SJoseph Koshy is_sx_downgraded = 1; \ 2898ebccf1e3SJoseph Koshy } while (0) 2899ebccf1e3SJoseph Koshy 2900ebccf1e3SJoseph Koshy static int 2901ebccf1e3SJoseph Koshy pmc_syscall_handler(struct thread *td, void *syscall_args) 2902ebccf1e3SJoseph Koshy { 290320b555e1SKonstantin Belousov int error, is_sx_downgraded, op; 2904ebccf1e3SJoseph Koshy struct pmc_syscall_args *c; 290520b555e1SKonstantin Belousov void *pmclog_proc_handle; 2906ebccf1e3SJoseph Koshy void *arg; 2907ebccf1e3SJoseph Koshy 2908ebccf1e3SJoseph Koshy c = (struct pmc_syscall_args *)syscall_args; 2909ebccf1e3SJoseph Koshy op = c->pmop_code; 2910ebccf1e3SJoseph Koshy arg = c->pmop_data; 2911*0f00315cSMatt Macy /* PMC isn't set up yet */ 2912*0f00315cSMatt Macy if (pmc_hook == NULL) 2913*0f00315cSMatt Macy return (EINVAL); 291420b555e1SKonstantin Belousov if (op == PMC_OP_CONFIGURELOG) { 291520b555e1SKonstantin Belousov /* 291620b555e1SKonstantin Belousov * We cannot create the logging process inside 291720b555e1SKonstantin Belousov * pmclog_configure_log() because there is a LOR 291820b555e1SKonstantin Belousov * between pmc_sx and process structure locks. 291920b555e1SKonstantin Belousov * Instead, pre-create the process and ignite the loop 292020b555e1SKonstantin Belousov * if everything is fine, otherwise direct the process 292120b555e1SKonstantin Belousov * to exit. 292220b555e1SKonstantin Belousov */ 292320b555e1SKonstantin Belousov error = pmclog_proc_create(td, &pmclog_proc_handle); 292420b555e1SKonstantin Belousov if (error != 0) 292520b555e1SKonstantin Belousov goto done_syscall; 292620b555e1SKonstantin Belousov } 292720b555e1SKonstantin Belousov 292820b555e1SKonstantin Belousov PMC_GET_SX_XLOCK(ENOSYS); 292920b555e1SKonstantin Belousov is_sx_downgraded = 0; 29304a3690dfSJohn Baldwin PMCDBG3(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2931ebccf1e3SJoseph Koshy pmc_op_to_name[op], arg); 2932ebccf1e3SJoseph Koshy 2933ebccf1e3SJoseph Koshy error = 0; 2934e6b475e0SMatt Macy counter_u64_add(pmc_stats.pm_syscalls, 1); 2935ebccf1e3SJoseph Koshy 2936cf9ef806SKonstantin Belousov switch (op) { 2937ebccf1e3SJoseph Koshy 2938ebccf1e3SJoseph Koshy 2939ebccf1e3SJoseph Koshy /* 2940ebccf1e3SJoseph Koshy * Configure a log file. 2941ebccf1e3SJoseph Koshy * 2942ebccf1e3SJoseph Koshy * XXX This OP will be reworked. 2943ebccf1e3SJoseph Koshy */ 2944ebccf1e3SJoseph Koshy 2945ebccf1e3SJoseph Koshy case PMC_OP_CONFIGURELOG: 2946ebccf1e3SJoseph Koshy { 294749874f6eSJoseph Koshy struct proc *p; 2948fc9a2b80SJoseph Koshy struct pmc *pm; 2949ebccf1e3SJoseph Koshy struct pmc_owner *po; 2950ebccf1e3SJoseph Koshy struct pmc_op_configurelog cl; 2951ebccf1e3SJoseph Koshy 295220b555e1SKonstantin Belousov if ((error = copyin(arg, &cl, sizeof(cl))) != 0) { 295320b555e1SKonstantin Belousov pmclog_proc_ignite(pmclog_proc_handle, NULL); 2954ebccf1e3SJoseph Koshy break; 295520b555e1SKonstantin Belousov } 2956ebccf1e3SJoseph Koshy 2957ebccf1e3SJoseph Koshy /* mark this process as owning a log file */ 2958ebccf1e3SJoseph Koshy p = td->td_proc; 2959ebccf1e3SJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2960f263522aSJoseph Koshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 296120b555e1SKonstantin Belousov pmclog_proc_ignite(pmclog_proc_handle, NULL); 2962f263522aSJoseph Koshy error = ENOMEM; 2963ebccf1e3SJoseph Koshy break; 2964f263522aSJoseph Koshy } 2965ebccf1e3SJoseph Koshy 2966f263522aSJoseph Koshy /* 2967f263522aSJoseph Koshy * If a valid fd was passed in, try to configure that, 2968f263522aSJoseph Koshy * otherwise if 'fd' was less than zero and there was 2969f263522aSJoseph Koshy * a log file configured, flush its buffers and 2970f263522aSJoseph Koshy * de-configure it. 2971f263522aSJoseph Koshy */ 2972ca2d94beSAttilio Rao if (cl.pm_logfd >= 0) { 29730cfab8ddSJoseph Koshy error = pmclog_configure_log(md, po, cl.pm_logfd); 297420b555e1SKonstantin Belousov pmclog_proc_ignite(pmclog_proc_handle, error == 0 ? 297520b555e1SKonstantin Belousov po : NULL); 2976ca2d94beSAttilio Rao } else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 297720b555e1SKonstantin Belousov pmclog_proc_ignite(pmclog_proc_handle, NULL); 2978dceed24aSFabien Thomas error = pmclog_close(po); 2979fc9a2b80SJoseph Koshy if (error == 0) { 2980fc9a2b80SJoseph Koshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 298166f3bc78SJoseph Koshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 298266f3bc78SJoseph Koshy pm->pm_state == PMC_STATE_RUNNING) 2983fc9a2b80SJoseph Koshy pmc_stop(pm); 2984f263522aSJoseph Koshy error = pmclog_deconfigure_log(po); 2985fc9a2b80SJoseph Koshy } 298620b555e1SKonstantin Belousov } else { 298720b555e1SKonstantin Belousov pmclog_proc_ignite(pmclog_proc_handle, NULL); 2988f263522aSJoseph Koshy error = EINVAL; 298920b555e1SKonstantin Belousov } 2990ebccf1e3SJoseph Koshy } 2991ebccf1e3SJoseph Koshy break; 2992ebccf1e3SJoseph Koshy 2993ebccf1e3SJoseph Koshy /* 2994f263522aSJoseph Koshy * Flush a log file. 2995f263522aSJoseph Koshy */ 2996f263522aSJoseph Koshy 2997f263522aSJoseph Koshy case PMC_OP_FLUSHLOG: 2998f263522aSJoseph Koshy { 2999f263522aSJoseph Koshy struct pmc_owner *po; 3000f263522aSJoseph Koshy 3001f263522aSJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 3002f263522aSJoseph Koshy 3003f263522aSJoseph Koshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 3004f263522aSJoseph Koshy error = EINVAL; 3005f263522aSJoseph Koshy break; 3006f263522aSJoseph Koshy } 3007f263522aSJoseph Koshy 3008f263522aSJoseph Koshy error = pmclog_flush(po); 3009f263522aSJoseph Koshy } 3010f263522aSJoseph Koshy break; 3011f263522aSJoseph Koshy 3012f263522aSJoseph Koshy /* 3013dceed24aSFabien Thomas * Close a log file. 3014dceed24aSFabien Thomas */ 3015dceed24aSFabien Thomas 3016dceed24aSFabien Thomas case PMC_OP_CLOSELOG: 3017dceed24aSFabien Thomas { 3018dceed24aSFabien Thomas struct pmc_owner *po; 3019dceed24aSFabien Thomas 3020dceed24aSFabien Thomas sx_assert(&pmc_sx, SX_XLOCKED); 3021dceed24aSFabien Thomas 3022dceed24aSFabien Thomas if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 3023dceed24aSFabien Thomas error = EINVAL; 3024dceed24aSFabien Thomas break; 3025dceed24aSFabien Thomas } 3026dceed24aSFabien Thomas 3027dceed24aSFabien Thomas error = pmclog_close(po); 3028dceed24aSFabien Thomas } 3029dceed24aSFabien Thomas break; 3030dceed24aSFabien Thomas 3031dceed24aSFabien Thomas /* 3032ebccf1e3SJoseph Koshy * Retrieve hardware configuration. 3033ebccf1e3SJoseph Koshy */ 3034ebccf1e3SJoseph Koshy 3035ebccf1e3SJoseph Koshy case PMC_OP_GETCPUINFO: /* CPU information */ 3036ebccf1e3SJoseph Koshy { 3037ebccf1e3SJoseph Koshy struct pmc_op_getcpuinfo gci; 3038e829eb6dSJoseph Koshy struct pmc_classinfo *pci; 3039e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 3040e829eb6dSJoseph Koshy int cl; 3041ebccf1e3SJoseph Koshy 3042ebccf1e3SJoseph Koshy gci.pm_cputype = md->pmd_cputype; 3043122ccdc1SJoseph Koshy gci.pm_ncpu = pmc_cpu_max(); 3044ebccf1e3SJoseph Koshy gci.pm_npmc = md->pmd_npmc; 3045ebccf1e3SJoseph Koshy gci.pm_nclass = md->pmd_nclass; 3046e829eb6dSJoseph Koshy pci = gci.pm_classes; 3047e829eb6dSJoseph Koshy pcd = md->pmd_classdep; 3048e829eb6dSJoseph Koshy for (cl = 0; cl < md->pmd_nclass; cl++, pci++, pcd++) { 3049e829eb6dSJoseph Koshy pci->pm_caps = pcd->pcd_caps; 3050e829eb6dSJoseph Koshy pci->pm_class = pcd->pcd_class; 3051e829eb6dSJoseph Koshy pci->pm_width = pcd->pcd_width; 3052e829eb6dSJoseph Koshy pci->pm_num = pcd->pcd_num; 3053e829eb6dSJoseph Koshy } 3054ebccf1e3SJoseph Koshy error = copyout(&gci, arg, sizeof(gci)); 3055ebccf1e3SJoseph Koshy } 3056ebccf1e3SJoseph Koshy break; 3057ebccf1e3SJoseph Koshy 3058f5f9340bSFabien Thomas /* 3059f5f9340bSFabien Thomas * Retrieve soft events list. 3060f5f9340bSFabien Thomas */ 3061f5f9340bSFabien Thomas case PMC_OP_GETDYNEVENTINFO: 3062f5f9340bSFabien Thomas { 3063f5f9340bSFabien Thomas enum pmc_class cl; 3064f5f9340bSFabien Thomas enum pmc_event ev; 3065f5f9340bSFabien Thomas struct pmc_op_getdyneventinfo *gei; 3066f5f9340bSFabien Thomas struct pmc_dyn_event_descr dev; 3067f5f9340bSFabien Thomas struct pmc_soft *ps; 3068f5f9340bSFabien Thomas uint32_t nevent; 3069f5f9340bSFabien Thomas 3070f5f9340bSFabien Thomas sx_assert(&pmc_sx, SX_LOCKED); 3071f5f9340bSFabien Thomas 3072f5f9340bSFabien Thomas gei = (struct pmc_op_getdyneventinfo *) arg; 3073f5f9340bSFabien Thomas 3074f5f9340bSFabien Thomas if ((error = copyin(&gei->pm_class, &cl, sizeof(cl))) != 0) 3075f5f9340bSFabien Thomas break; 3076f5f9340bSFabien Thomas 3077f5f9340bSFabien Thomas /* Only SOFT class is dynamic. */ 3078f5f9340bSFabien Thomas if (cl != PMC_CLASS_SOFT) { 3079f5f9340bSFabien Thomas error = EINVAL; 3080f5f9340bSFabien Thomas break; 3081f5f9340bSFabien Thomas } 3082f5f9340bSFabien Thomas 3083f5f9340bSFabien Thomas nevent = 0; 3084ca57f64fSSean Bruno for (ev = PMC_EV_SOFT_FIRST; (int)ev <= PMC_EV_SOFT_LAST; ev++) { 3085f5f9340bSFabien Thomas ps = pmc_soft_ev_acquire(ev); 3086f5f9340bSFabien Thomas if (ps == NULL) 3087f5f9340bSFabien Thomas continue; 3088f5f9340bSFabien Thomas bcopy(&ps->ps_ev, &dev, sizeof(dev)); 3089f5f9340bSFabien Thomas pmc_soft_ev_release(ps); 3090f5f9340bSFabien Thomas 3091f5f9340bSFabien Thomas error = copyout(&dev, 3092f5f9340bSFabien Thomas &gei->pm_events[nevent], 3093f5f9340bSFabien Thomas sizeof(struct pmc_dyn_event_descr)); 3094f5f9340bSFabien Thomas if (error != 0) 3095f5f9340bSFabien Thomas break; 3096f5f9340bSFabien Thomas nevent++; 3097f5f9340bSFabien Thomas } 3098f5f9340bSFabien Thomas if (error != 0) 3099f5f9340bSFabien Thomas break; 3100f5f9340bSFabien Thomas 3101f5f9340bSFabien Thomas error = copyout(&nevent, &gei->pm_nevent, 3102f5f9340bSFabien Thomas sizeof(nevent)); 3103f5f9340bSFabien Thomas } 3104f5f9340bSFabien Thomas break; 3105ebccf1e3SJoseph Koshy 3106ebccf1e3SJoseph Koshy /* 3107ebccf1e3SJoseph Koshy * Get module statistics 3108ebccf1e3SJoseph Koshy */ 3109ebccf1e3SJoseph Koshy 3110ebccf1e3SJoseph Koshy case PMC_OP_GETDRIVERSTATS: 3111ebccf1e3SJoseph Koshy { 3112ebccf1e3SJoseph Koshy struct pmc_op_getdriverstats gms; 3113e6b475e0SMatt Macy #define CFETCH(a, b, field) a.field = counter_u64_fetch(b.field) 3114e6b475e0SMatt Macy CFETCH(gms, pmc_stats, pm_intr_ignored); 3115e6b475e0SMatt Macy CFETCH(gms, pmc_stats, pm_intr_processed); 3116e6b475e0SMatt Macy CFETCH(gms, pmc_stats, pm_intr_bufferfull); 3117e6b475e0SMatt Macy CFETCH(gms, pmc_stats, pm_syscalls); 3118e6b475e0SMatt Macy CFETCH(gms, pmc_stats, pm_syscall_errors); 3119e6b475e0SMatt Macy CFETCH(gms, pmc_stats, pm_buffer_requests); 3120e6b475e0SMatt Macy CFETCH(gms, pmc_stats, pm_buffer_requests_failed); 3121e6b475e0SMatt Macy CFETCH(gms, pmc_stats, pm_log_sweeps); 3122e6b475e0SMatt Macy #undef CFETCH 3123ebccf1e3SJoseph Koshy error = copyout(&gms, arg, sizeof(gms)); 3124ebccf1e3SJoseph Koshy } 3125ebccf1e3SJoseph Koshy break; 3126ebccf1e3SJoseph Koshy 3127ebccf1e3SJoseph Koshy 3128ebccf1e3SJoseph Koshy /* 3129ebccf1e3SJoseph Koshy * Retrieve module version number 3130ebccf1e3SJoseph Koshy */ 3131ebccf1e3SJoseph Koshy 3132ebccf1e3SJoseph Koshy case PMC_OP_GETMODULEVERSION: 3133ebccf1e3SJoseph Koshy { 3134f263522aSJoseph Koshy uint32_t cv, modv; 3135f263522aSJoseph Koshy 3136f263522aSJoseph Koshy /* retrieve the client's idea of the ABI version */ 3137f263522aSJoseph Koshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 3138f263522aSJoseph Koshy break; 3139f263522aSJoseph Koshy /* don't service clients newer than our driver */ 3140f263522aSJoseph Koshy modv = PMC_VERSION; 3141f263522aSJoseph Koshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 3142f263522aSJoseph Koshy error = EPROGMISMATCH; 3143f263522aSJoseph Koshy break; 3144f263522aSJoseph Koshy } 3145f263522aSJoseph Koshy error = copyout(&modv, arg, sizeof(int)); 3146ebccf1e3SJoseph Koshy } 3147ebccf1e3SJoseph Koshy break; 3148ebccf1e3SJoseph Koshy 3149ebccf1e3SJoseph Koshy 3150ebccf1e3SJoseph Koshy /* 3151ebccf1e3SJoseph Koshy * Retrieve the state of all the PMCs on a given 3152ebccf1e3SJoseph Koshy * CPU. 3153ebccf1e3SJoseph Koshy */ 3154ebccf1e3SJoseph Koshy 3155ebccf1e3SJoseph Koshy case PMC_OP_GETPMCINFO: 3156ebccf1e3SJoseph Koshy { 3157e829eb6dSJoseph Koshy int ari; 3158ebccf1e3SJoseph Koshy struct pmc *pm; 3159e829eb6dSJoseph Koshy size_t pmcinfo_size; 3160e829eb6dSJoseph Koshy uint32_t cpu, n, npmc; 3161ebccf1e3SJoseph Koshy struct pmc_owner *po; 3162ebccf1e3SJoseph Koshy struct pmc_binding pb; 3163e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 3164e829eb6dSJoseph Koshy struct pmc_info *p, *pmcinfo; 3165e829eb6dSJoseph Koshy struct pmc_op_getpmcinfo *gpi; 3166ebccf1e3SJoseph Koshy 3167ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 3168ebccf1e3SJoseph Koshy 3169ebccf1e3SJoseph Koshy gpi = (struct pmc_op_getpmcinfo *) arg; 3170ebccf1e3SJoseph Koshy 3171ebccf1e3SJoseph Koshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 3172ebccf1e3SJoseph Koshy break; 3173ebccf1e3SJoseph Koshy 3174122ccdc1SJoseph Koshy if (cpu >= pmc_cpu_max()) { 3175ebccf1e3SJoseph Koshy error = EINVAL; 3176ebccf1e3SJoseph Koshy break; 3177ebccf1e3SJoseph Koshy } 3178ebccf1e3SJoseph Koshy 3179122ccdc1SJoseph Koshy if (!pmc_cpu_is_active(cpu)) { 3180ebccf1e3SJoseph Koshy error = ENXIO; 3181ebccf1e3SJoseph Koshy break; 3182ebccf1e3SJoseph Koshy } 3183ebccf1e3SJoseph Koshy 3184ebccf1e3SJoseph Koshy /* switch to CPU 'cpu' */ 3185ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 3186ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 3187ebccf1e3SJoseph Koshy 3188ebccf1e3SJoseph Koshy npmc = md->pmd_npmc; 3189ebccf1e3SJoseph Koshy 3190ebccf1e3SJoseph Koshy pmcinfo_size = npmc * sizeof(struct pmc_info); 3191e11e3f18SDag-Erling Smørgrav pmcinfo = malloc(pmcinfo_size, M_PMC, M_WAITOK); 3192ebccf1e3SJoseph Koshy 3193ebccf1e3SJoseph Koshy p = pmcinfo; 3194ebccf1e3SJoseph Koshy 3195ebccf1e3SJoseph Koshy for (n = 0; n < md->pmd_npmc; n++, p++) { 3196ebccf1e3SJoseph Koshy 3197e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, n, &ari); 3198e829eb6dSJoseph Koshy 3199e829eb6dSJoseph Koshy KASSERT(pcd != NULL, 3200e829eb6dSJoseph Koshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 3201e829eb6dSJoseph Koshy 3202e829eb6dSJoseph Koshy if ((error = pcd->pcd_describe(cpu, ari, p, &pm)) != 0) 3203ebccf1e3SJoseph Koshy break; 3204ebccf1e3SJoseph Koshy 3205ebccf1e3SJoseph Koshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 3206ebccf1e3SJoseph Koshy p->pm_rowdisp = PMC_DISP_STANDALONE; 3207ebccf1e3SJoseph Koshy else if (PMC_ROW_DISP_IS_THREAD(n)) 3208ebccf1e3SJoseph Koshy p->pm_rowdisp = PMC_DISP_THREAD; 3209ebccf1e3SJoseph Koshy else 3210ebccf1e3SJoseph Koshy p->pm_rowdisp = PMC_DISP_FREE; 3211ebccf1e3SJoseph Koshy 3212ebccf1e3SJoseph Koshy p->pm_ownerpid = -1; 3213ebccf1e3SJoseph Koshy 3214ebccf1e3SJoseph Koshy if (pm == NULL) /* no PMC associated */ 3215ebccf1e3SJoseph Koshy continue; 3216ebccf1e3SJoseph Koshy 3217ebccf1e3SJoseph Koshy po = pm->pm_owner; 3218ebccf1e3SJoseph Koshy 3219ebccf1e3SJoseph Koshy KASSERT(po->po_owner != NULL, 3220ebccf1e3SJoseph Koshy ("[pmc,%d] pmc_owner had a null proc pointer", 3221ebccf1e3SJoseph Koshy __LINE__)); 3222ebccf1e3SJoseph Koshy 3223ebccf1e3SJoseph Koshy p->pm_ownerpid = po->po_owner->p_pid; 3224c5153e19SJoseph Koshy p->pm_mode = PMC_TO_MODE(pm); 3225ebccf1e3SJoseph Koshy p->pm_event = pm->pm_event; 3226ebccf1e3SJoseph Koshy p->pm_flags = pm->pm_flags; 3227ebccf1e3SJoseph Koshy 3228c5153e19SJoseph Koshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3229ebccf1e3SJoseph Koshy p->pm_reloadcount = 3230ebccf1e3SJoseph Koshy pm->pm_sc.pm_reloadcount; 3231ebccf1e3SJoseph Koshy } 3232ebccf1e3SJoseph Koshy 3233ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 3234ebccf1e3SJoseph Koshy 3235ebccf1e3SJoseph Koshy /* now copy out the PMC info collected */ 3236ebccf1e3SJoseph Koshy if (error == 0) 3237ebccf1e3SJoseph Koshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 3238ebccf1e3SJoseph Koshy 32391ede983cSDag-Erling Smørgrav free(pmcinfo, M_PMC); 3240ebccf1e3SJoseph Koshy } 3241ebccf1e3SJoseph Koshy break; 3242ebccf1e3SJoseph Koshy 3243ebccf1e3SJoseph Koshy 3244ebccf1e3SJoseph Koshy /* 3245ebccf1e3SJoseph Koshy * Set the administrative state of a PMC. I.e. whether 3246ebccf1e3SJoseph Koshy * the PMC is to be used or not. 3247ebccf1e3SJoseph Koshy */ 3248ebccf1e3SJoseph Koshy 3249ebccf1e3SJoseph Koshy case PMC_OP_PMCADMIN: 3250ebccf1e3SJoseph Koshy { 3251ebccf1e3SJoseph Koshy int cpu, ri; 3252ebccf1e3SJoseph Koshy enum pmc_state request; 3253ebccf1e3SJoseph Koshy struct pmc_cpu *pc; 3254ebccf1e3SJoseph Koshy struct pmc_hw *phw; 3255ebccf1e3SJoseph Koshy struct pmc_op_pmcadmin pma; 3256ebccf1e3SJoseph Koshy struct pmc_binding pb; 3257ebccf1e3SJoseph Koshy 3258ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 3259ebccf1e3SJoseph Koshy 3260ebccf1e3SJoseph Koshy KASSERT(td == curthread, 3261ebccf1e3SJoseph Koshy ("[pmc,%d] td != curthread", __LINE__)); 3262ebccf1e3SJoseph Koshy 3263acd3428bSRobert Watson error = priv_check(td, PRIV_PMC_MANAGE); 3264acd3428bSRobert Watson if (error) 3265ebccf1e3SJoseph Koshy break; 3266ebccf1e3SJoseph Koshy 3267ebccf1e3SJoseph Koshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 3268ebccf1e3SJoseph Koshy break; 3269ebccf1e3SJoseph Koshy 3270ebccf1e3SJoseph Koshy cpu = pma.pm_cpu; 3271ebccf1e3SJoseph Koshy 3272122ccdc1SJoseph Koshy if (cpu < 0 || cpu >= (int) pmc_cpu_max()) { 3273ebccf1e3SJoseph Koshy error = EINVAL; 3274ebccf1e3SJoseph Koshy break; 3275ebccf1e3SJoseph Koshy } 3276ebccf1e3SJoseph Koshy 3277122ccdc1SJoseph Koshy if (!pmc_cpu_is_active(cpu)) { 3278ebccf1e3SJoseph Koshy error = ENXIO; 3279ebccf1e3SJoseph Koshy break; 3280ebccf1e3SJoseph Koshy } 3281ebccf1e3SJoseph Koshy 3282ebccf1e3SJoseph Koshy request = pma.pm_state; 3283ebccf1e3SJoseph Koshy 3284ebccf1e3SJoseph Koshy if (request != PMC_STATE_DISABLED && 3285ebccf1e3SJoseph Koshy request != PMC_STATE_FREE) { 3286ebccf1e3SJoseph Koshy error = EINVAL; 3287ebccf1e3SJoseph Koshy break; 3288ebccf1e3SJoseph Koshy } 3289ebccf1e3SJoseph Koshy 3290ebccf1e3SJoseph Koshy ri = pma.pm_pmc; /* pmc id == row index */ 3291ebccf1e3SJoseph Koshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 3292ebccf1e3SJoseph Koshy error = EINVAL; 3293ebccf1e3SJoseph Koshy break; 3294ebccf1e3SJoseph Koshy } 3295ebccf1e3SJoseph Koshy 3296ebccf1e3SJoseph Koshy /* 3297ebccf1e3SJoseph Koshy * We can't disable a PMC with a row-index allocated 3298ebccf1e3SJoseph Koshy * for process virtual PMCs. 3299ebccf1e3SJoseph Koshy */ 3300ebccf1e3SJoseph Koshy 3301ebccf1e3SJoseph Koshy if (PMC_ROW_DISP_IS_THREAD(ri) && 3302ebccf1e3SJoseph Koshy request == PMC_STATE_DISABLED) { 3303ebccf1e3SJoseph Koshy error = EBUSY; 3304ebccf1e3SJoseph Koshy break; 3305ebccf1e3SJoseph Koshy } 3306ebccf1e3SJoseph Koshy 3307ebccf1e3SJoseph Koshy /* 3308ebccf1e3SJoseph Koshy * otherwise, this PMC on this CPU is either free or 3309ebccf1e3SJoseph Koshy * in system-wide mode. 3310ebccf1e3SJoseph Koshy */ 3311ebccf1e3SJoseph Koshy 3312ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 3313ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 3314ebccf1e3SJoseph Koshy 3315ebccf1e3SJoseph Koshy pc = pmc_pcpu[cpu]; 3316ebccf1e3SJoseph Koshy phw = pc->pc_hwpmcs[ri]; 3317ebccf1e3SJoseph Koshy 3318ebccf1e3SJoseph Koshy /* 3319ebccf1e3SJoseph Koshy * XXX do we need some kind of 'forced' disable? 3320ebccf1e3SJoseph Koshy */ 3321ebccf1e3SJoseph Koshy 3322ebccf1e3SJoseph Koshy if (phw->phw_pmc == NULL) { 3323ebccf1e3SJoseph Koshy if (request == PMC_STATE_DISABLED && 3324ebccf1e3SJoseph Koshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 3325ebccf1e3SJoseph Koshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 3326ebccf1e3SJoseph Koshy PMC_MARK_ROW_STANDALONE(ri); 3327ebccf1e3SJoseph Koshy } else if (request == PMC_STATE_FREE && 3328ebccf1e3SJoseph Koshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 3329ebccf1e3SJoseph Koshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 3330ebccf1e3SJoseph Koshy PMC_UNMARK_ROW_STANDALONE(ri); 3331ebccf1e3SJoseph Koshy } 3332ebccf1e3SJoseph Koshy /* other cases are a no-op */ 3333ebccf1e3SJoseph Koshy } else 3334ebccf1e3SJoseph Koshy error = EBUSY; 3335ebccf1e3SJoseph Koshy 3336ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 3337ebccf1e3SJoseph Koshy } 3338ebccf1e3SJoseph Koshy break; 3339ebccf1e3SJoseph Koshy 3340ebccf1e3SJoseph Koshy 3341ebccf1e3SJoseph Koshy /* 3342ebccf1e3SJoseph Koshy * Allocate a PMC. 3343ebccf1e3SJoseph Koshy */ 3344ebccf1e3SJoseph Koshy 3345ebccf1e3SJoseph Koshy case PMC_OP_PMCALLOCATE: 3346ebccf1e3SJoseph Koshy { 3347e829eb6dSJoseph Koshy int adjri, n; 3348ebccf1e3SJoseph Koshy u_int cpu; 3349e829eb6dSJoseph Koshy uint32_t caps; 3350ebccf1e3SJoseph Koshy struct pmc *pmc; 3351e829eb6dSJoseph Koshy enum pmc_mode mode; 3352c5153e19SJoseph Koshy struct pmc_hw *phw; 3353ebccf1e3SJoseph Koshy struct pmc_binding pb; 3354e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 3355e829eb6dSJoseph Koshy struct pmc_op_pmcallocate pa; 3356ebccf1e3SJoseph Koshy 3357ebccf1e3SJoseph Koshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 3358ebccf1e3SJoseph Koshy break; 3359ebccf1e3SJoseph Koshy 3360ebccf1e3SJoseph Koshy caps = pa.pm_caps; 3361ebccf1e3SJoseph Koshy mode = pa.pm_mode; 3362ebccf1e3SJoseph Koshy cpu = pa.pm_cpu; 3363ebccf1e3SJoseph Koshy 3364ebccf1e3SJoseph Koshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 3365ebccf1e3SJoseph Koshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 3366122ccdc1SJoseph Koshy (cpu != (u_int) PMC_CPU_ANY && cpu >= pmc_cpu_max())) { 3367ebccf1e3SJoseph Koshy error = EINVAL; 3368ebccf1e3SJoseph Koshy break; 3369ebccf1e3SJoseph Koshy } 3370ebccf1e3SJoseph Koshy 3371ebccf1e3SJoseph Koshy /* 3372ebccf1e3SJoseph Koshy * Virtual PMCs should only ask for a default CPU. 3373ebccf1e3SJoseph Koshy * System mode PMCs need to specify a non-default CPU. 3374ebccf1e3SJoseph Koshy */ 3375ebccf1e3SJoseph Koshy 3376ebccf1e3SJoseph Koshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 3377ebccf1e3SJoseph Koshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 3378ebccf1e3SJoseph Koshy error = EINVAL; 3379ebccf1e3SJoseph Koshy break; 3380ebccf1e3SJoseph Koshy } 3381ebccf1e3SJoseph Koshy 3382ebccf1e3SJoseph Koshy /* 3383122ccdc1SJoseph Koshy * Check that an inactive CPU is not being asked for. 3384ebccf1e3SJoseph Koshy */ 3385ebccf1e3SJoseph Koshy 3386122ccdc1SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode) && !pmc_cpu_is_active(cpu)) { 3387ebccf1e3SJoseph Koshy error = ENXIO; 3388ebccf1e3SJoseph Koshy break; 3389ebccf1e3SJoseph Koshy } 3390ebccf1e3SJoseph Koshy 3391ebccf1e3SJoseph Koshy /* 3392ebccf1e3SJoseph Koshy * Refuse an allocation for a system-wide PMC if this 3393ebccf1e3SJoseph Koshy * process has been jailed, or if this process lacks 3394ebccf1e3SJoseph Koshy * super-user credentials and the sysctl tunable 3395ebccf1e3SJoseph Koshy * 'security.bsd.unprivileged_syspmcs' is zero. 3396ebccf1e3SJoseph Koshy */ 3397ebccf1e3SJoseph Koshy 3398ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) { 3399acd3428bSRobert Watson if (jailed(curthread->td_ucred)) { 3400ebccf1e3SJoseph Koshy error = EPERM; 3401acd3428bSRobert Watson break; 3402acd3428bSRobert Watson } 3403acd3428bSRobert Watson if (!pmc_unprivileged_syspmcs) { 3404acd3428bSRobert Watson error = priv_check(curthread, 3405acd3428bSRobert Watson PRIV_PMC_SYSTEM); 3406acd3428bSRobert Watson if (error) 3407acd3428bSRobert Watson break; 3408acd3428bSRobert Watson } 3409ebccf1e3SJoseph Koshy } 3410ebccf1e3SJoseph Koshy 3411ebccf1e3SJoseph Koshy /* 3412ebccf1e3SJoseph Koshy * Look for valid values for 'pm_flags' 3413ebccf1e3SJoseph Koshy */ 3414ebccf1e3SJoseph Koshy 3415f263522aSJoseph Koshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 3416d07f36b0SJoseph Koshy PMC_F_LOG_PROCEXIT | PMC_F_CALLCHAIN)) != 0) { 3417f263522aSJoseph Koshy error = EINVAL; 3418f263522aSJoseph Koshy break; 3419f263522aSJoseph Koshy } 3420f263522aSJoseph Koshy 3421f263522aSJoseph Koshy /* process logging options are not allowed for system PMCs */ 3422f263522aSJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 3423f263522aSJoseph Koshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 3424ebccf1e3SJoseph Koshy error = EINVAL; 3425ebccf1e3SJoseph Koshy break; 3426ebccf1e3SJoseph Koshy } 3427ebccf1e3SJoseph Koshy 3428ebccf1e3SJoseph Koshy /* 3429ebccf1e3SJoseph Koshy * All sampling mode PMCs need to be able to interrupt the 3430ebccf1e3SJoseph Koshy * CPU. 3431ebccf1e3SJoseph Koshy */ 3432f263522aSJoseph Koshy if (PMC_IS_SAMPLING_MODE(mode)) 3433ebccf1e3SJoseph Koshy caps |= PMC_CAP_INTERRUPT; 3434ebccf1e3SJoseph Koshy 3435744d6797SJoseph Koshy /* A valid class specifier should have been passed in. */ 3436744d6797SJoseph Koshy for (n = 0; n < md->pmd_nclass; n++) 3437e829eb6dSJoseph Koshy if (md->pmd_classdep[n].pcd_class == pa.pm_class) 3438744d6797SJoseph Koshy break; 3439744d6797SJoseph Koshy if (n == md->pmd_nclass) { 3440744d6797SJoseph Koshy error = EINVAL; 3441744d6797SJoseph Koshy break; 3442744d6797SJoseph Koshy } 3443744d6797SJoseph Koshy 3444744d6797SJoseph Koshy /* The requested PMC capabilities should be feasible. */ 3445e829eb6dSJoseph Koshy if ((md->pmd_classdep[n].pcd_caps & caps) != caps) { 3446744d6797SJoseph Koshy error = EOPNOTSUPP; 3447744d6797SJoseph Koshy break; 3448744d6797SJoseph Koshy } 3449744d6797SJoseph Koshy 34504a3690dfSJohn Baldwin PMCDBG4(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 3451ebccf1e3SJoseph Koshy pa.pm_ev, caps, mode, cpu); 3452ebccf1e3SJoseph Koshy 3453ebccf1e3SJoseph Koshy pmc = pmc_allocate_pmc_descriptor(); 3454c5153e19SJoseph Koshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 3455c5153e19SJoseph Koshy PMC_ID_INVALID); 3456ebccf1e3SJoseph Koshy pmc->pm_event = pa.pm_ev; 3457ebccf1e3SJoseph Koshy pmc->pm_state = PMC_STATE_FREE; 3458ebccf1e3SJoseph Koshy pmc->pm_caps = caps; 3459ebccf1e3SJoseph Koshy pmc->pm_flags = pa.pm_flags; 3460ebccf1e3SJoseph Koshy 3461ebccf1e3SJoseph Koshy /* switch thread to CPU 'cpu' */ 3462ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 3463ebccf1e3SJoseph Koshy 3464ebccf1e3SJoseph Koshy #define PMC_IS_SHAREABLE_PMC(cpu, n) \ 3465ebccf1e3SJoseph Koshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 3466ebccf1e3SJoseph Koshy PMC_PHW_FLAG_IS_SHAREABLE) 3467ebccf1e3SJoseph Koshy #define PMC_IS_UNALLOCATED(cpu, n) \ 3468ebccf1e3SJoseph Koshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 3469ebccf1e3SJoseph Koshy 3470ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) { 3471ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 3472e829eb6dSJoseph Koshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3473e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3474ebccf1e3SJoseph Koshy if (pmc_can_allocate_row(n, mode) == 0 && 3475ebccf1e3SJoseph Koshy pmc_can_allocate_rowindex( 3476c5153e19SJoseph Koshy curthread->td_proc, n, cpu) == 0 && 3477ebccf1e3SJoseph Koshy (PMC_IS_UNALLOCATED(cpu, n) || 3478ebccf1e3SJoseph Koshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 3479e829eb6dSJoseph Koshy pcd->pcd_allocate_pmc(cpu, adjri, pmc, 3480ebccf1e3SJoseph Koshy &pa) == 0) 3481ebccf1e3SJoseph Koshy break; 3482e829eb6dSJoseph Koshy } 3483ebccf1e3SJoseph Koshy } else { 3484ebccf1e3SJoseph Koshy /* Process virtual mode */ 3485ebccf1e3SJoseph Koshy for (n = 0; n < (int) md->pmd_npmc; n++) { 3486e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3487ebccf1e3SJoseph Koshy if (pmc_can_allocate_row(n, mode) == 0 && 3488ebccf1e3SJoseph Koshy pmc_can_allocate_rowindex( 3489c5153e19SJoseph Koshy curthread->td_proc, n, 3490c5153e19SJoseph Koshy PMC_CPU_ANY) == 0 && 3491e829eb6dSJoseph Koshy pcd->pcd_allocate_pmc(curthread->td_oncpu, 3492e829eb6dSJoseph Koshy adjri, pmc, &pa) == 0) 3493ebccf1e3SJoseph Koshy break; 3494ebccf1e3SJoseph Koshy } 3495ebccf1e3SJoseph Koshy } 3496ebccf1e3SJoseph Koshy 3497ebccf1e3SJoseph Koshy #undef PMC_IS_UNALLOCATED 3498ebccf1e3SJoseph Koshy #undef PMC_IS_SHAREABLE_PMC 3499ebccf1e3SJoseph Koshy 3500ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 3501ebccf1e3SJoseph Koshy 3502ebccf1e3SJoseph Koshy if (n == (int) md->pmd_npmc) { 3503ebccf1e3SJoseph Koshy pmc_destroy_pmc_descriptor(pmc); 3504ebccf1e3SJoseph Koshy pmc = NULL; 3505ebccf1e3SJoseph Koshy error = EINVAL; 3506ebccf1e3SJoseph Koshy break; 3507ebccf1e3SJoseph Koshy } 3508ebccf1e3SJoseph Koshy 3509c5153e19SJoseph Koshy /* Fill in the correct value in the ID field */ 3510c5153e19SJoseph Koshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 3511c5153e19SJoseph Koshy 35124a3690dfSJohn Baldwin PMCDBG5(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 3513c5153e19SJoseph Koshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 3514ebccf1e3SJoseph Koshy 3515f263522aSJoseph Koshy /* Process mode PMCs with logging enabled need log files */ 3516f263522aSJoseph Koshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 3517f263522aSJoseph Koshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3518f263522aSJoseph Koshy 3519f263522aSJoseph Koshy /* All system mode sampling PMCs require a log file */ 3520f263522aSJoseph Koshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 3521f263522aSJoseph Koshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 3522f263522aSJoseph Koshy 3523ebccf1e3SJoseph Koshy /* 3524ebccf1e3SJoseph Koshy * Configure global pmc's immediately 3525ebccf1e3SJoseph Koshy */ 3526ebccf1e3SJoseph Koshy 3527c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 3528c5153e19SJoseph Koshy 3529c5153e19SJoseph Koshy pmc_save_cpu_binding(&pb); 3530c5153e19SJoseph Koshy pmc_select_cpu(cpu); 3531c5153e19SJoseph Koshy 3532c5153e19SJoseph Koshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 3533e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, n, &adjri); 3534c5153e19SJoseph Koshy 3535c5153e19SJoseph Koshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 3536e829eb6dSJoseph Koshy (error = pcd->pcd_config_pmc(cpu, adjri, pmc)) != 0) { 3537e829eb6dSJoseph Koshy (void) pcd->pcd_release_pmc(cpu, adjri, pmc); 3538ebccf1e3SJoseph Koshy pmc_destroy_pmc_descriptor(pmc); 3539ebccf1e3SJoseph Koshy pmc = NULL; 3540c5153e19SJoseph Koshy pmc_restore_cpu_binding(&pb); 3541c5153e19SJoseph Koshy error = EPERM; 3542ebccf1e3SJoseph Koshy break; 3543ebccf1e3SJoseph Koshy } 3544ebccf1e3SJoseph Koshy 3545c5153e19SJoseph Koshy pmc_restore_cpu_binding(&pb); 3546c5153e19SJoseph Koshy } 3547ebccf1e3SJoseph Koshy 3548ebccf1e3SJoseph Koshy pmc->pm_state = PMC_STATE_ALLOCATED; 3549ebccf1e3SJoseph Koshy 3550ebccf1e3SJoseph Koshy /* 3551ebccf1e3SJoseph Koshy * mark row disposition 3552ebccf1e3SJoseph Koshy */ 3553ebccf1e3SJoseph Koshy 3554ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) 3555ebccf1e3SJoseph Koshy PMC_MARK_ROW_STANDALONE(n); 3556ebccf1e3SJoseph Koshy else 3557ebccf1e3SJoseph Koshy PMC_MARK_ROW_THREAD(n); 3558ebccf1e3SJoseph Koshy 3559ebccf1e3SJoseph Koshy /* 3560ebccf1e3SJoseph Koshy * Register this PMC with the current thread as its owner. 3561ebccf1e3SJoseph Koshy */ 3562ebccf1e3SJoseph Koshy 3563ebccf1e3SJoseph Koshy if ((error = 3564ebccf1e3SJoseph Koshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 3565ebccf1e3SJoseph Koshy pmc_release_pmc_descriptor(pmc); 356606796b67SMark Johnston pmc_destroy_pmc_descriptor(pmc); 3567ebccf1e3SJoseph Koshy pmc = NULL; 3568ebccf1e3SJoseph Koshy break; 3569ebccf1e3SJoseph Koshy } 3570ebccf1e3SJoseph Koshy 3571ebccf1e3SJoseph Koshy /* 3572ebccf1e3SJoseph Koshy * Return the allocated index. 3573ebccf1e3SJoseph Koshy */ 3574ebccf1e3SJoseph Koshy 3575c5153e19SJoseph Koshy pa.pm_pmcid = pmc->pm_id; 3576ebccf1e3SJoseph Koshy 3577ebccf1e3SJoseph Koshy error = copyout(&pa, arg, sizeof(pa)); 3578ebccf1e3SJoseph Koshy } 3579ebccf1e3SJoseph Koshy break; 3580ebccf1e3SJoseph Koshy 3581ebccf1e3SJoseph Koshy 3582ebccf1e3SJoseph Koshy /* 3583ebccf1e3SJoseph Koshy * Attach a PMC to a process. 3584ebccf1e3SJoseph Koshy */ 3585ebccf1e3SJoseph Koshy 3586ebccf1e3SJoseph Koshy case PMC_OP_PMCATTACH: 3587ebccf1e3SJoseph Koshy { 3588ebccf1e3SJoseph Koshy struct pmc *pm; 3589ebccf1e3SJoseph Koshy struct proc *p; 3590ebccf1e3SJoseph Koshy struct pmc_op_pmcattach a; 3591ebccf1e3SJoseph Koshy 3592ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 3593ebccf1e3SJoseph Koshy 3594ebccf1e3SJoseph Koshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3595ebccf1e3SJoseph Koshy break; 3596ebccf1e3SJoseph Koshy 3597ebccf1e3SJoseph Koshy if (a.pm_pid < 0) { 3598ebccf1e3SJoseph Koshy error = EINVAL; 3599ebccf1e3SJoseph Koshy break; 3600ebccf1e3SJoseph Koshy } else if (a.pm_pid == 0) 3601ebccf1e3SJoseph Koshy a.pm_pid = td->td_proc->p_pid; 3602ebccf1e3SJoseph Koshy 3603ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3604ebccf1e3SJoseph Koshy break; 3605ebccf1e3SJoseph Koshy 3606c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 3607ebccf1e3SJoseph Koshy error = EINVAL; 3608ebccf1e3SJoseph Koshy break; 3609ebccf1e3SJoseph Koshy } 3610ebccf1e3SJoseph Koshy 3611ebccf1e3SJoseph Koshy /* PMCs may be (re)attached only when allocated or stopped */ 3612ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING) { 3613ebccf1e3SJoseph Koshy error = EBUSY; 3614ebccf1e3SJoseph Koshy break; 3615ebccf1e3SJoseph Koshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 3616ebccf1e3SJoseph Koshy pm->pm_state != PMC_STATE_STOPPED) { 3617ebccf1e3SJoseph Koshy error = EINVAL; 3618ebccf1e3SJoseph Koshy break; 3619ebccf1e3SJoseph Koshy } 3620ebccf1e3SJoseph Koshy 3621ebccf1e3SJoseph Koshy /* lookup pid */ 3622ebccf1e3SJoseph Koshy if ((p = pfind(a.pm_pid)) == NULL) { 3623ebccf1e3SJoseph Koshy error = ESRCH; 3624ebccf1e3SJoseph Koshy break; 3625ebccf1e3SJoseph Koshy } 3626ebccf1e3SJoseph Koshy 3627ebccf1e3SJoseph Koshy /* 3628ebccf1e3SJoseph Koshy * Ignore processes that are working on exiting. 3629ebccf1e3SJoseph Koshy */ 3630ebccf1e3SJoseph Koshy if (p->p_flag & P_WEXIT) { 3631ebccf1e3SJoseph Koshy error = ESRCH; 3632ebccf1e3SJoseph Koshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3633ebccf1e3SJoseph Koshy break; 3634ebccf1e3SJoseph Koshy } 3635ebccf1e3SJoseph Koshy 3636ebccf1e3SJoseph Koshy /* 3637ebccf1e3SJoseph Koshy * we are allowed to attach a PMC to a process if 3638ebccf1e3SJoseph Koshy * we can debug it. 3639ebccf1e3SJoseph Koshy */ 3640ebccf1e3SJoseph Koshy error = p_candebug(curthread, p); 3641ebccf1e3SJoseph Koshy 3642ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 3643ebccf1e3SJoseph Koshy 3644ebccf1e3SJoseph Koshy if (error == 0) 3645ebccf1e3SJoseph Koshy error = pmc_attach_process(p, pm); 3646ebccf1e3SJoseph Koshy } 3647ebccf1e3SJoseph Koshy break; 3648ebccf1e3SJoseph Koshy 3649ebccf1e3SJoseph Koshy 3650ebccf1e3SJoseph Koshy /* 3651ebccf1e3SJoseph Koshy * Detach an attached PMC from a process. 3652ebccf1e3SJoseph Koshy */ 3653ebccf1e3SJoseph Koshy 3654ebccf1e3SJoseph Koshy case PMC_OP_PMCDETACH: 3655ebccf1e3SJoseph Koshy { 3656ebccf1e3SJoseph Koshy struct pmc *pm; 3657ebccf1e3SJoseph Koshy struct proc *p; 3658ebccf1e3SJoseph Koshy struct pmc_op_pmcattach a; 3659ebccf1e3SJoseph Koshy 3660ebccf1e3SJoseph Koshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3661ebccf1e3SJoseph Koshy break; 3662ebccf1e3SJoseph Koshy 3663ebccf1e3SJoseph Koshy if (a.pm_pid < 0) { 3664ebccf1e3SJoseph Koshy error = EINVAL; 3665ebccf1e3SJoseph Koshy break; 3666ebccf1e3SJoseph Koshy } else if (a.pm_pid == 0) 3667ebccf1e3SJoseph Koshy a.pm_pid = td->td_proc->p_pid; 3668ebccf1e3SJoseph Koshy 3669ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3670ebccf1e3SJoseph Koshy break; 3671ebccf1e3SJoseph Koshy 3672ebccf1e3SJoseph Koshy if ((p = pfind(a.pm_pid)) == NULL) { 3673ebccf1e3SJoseph Koshy error = ESRCH; 3674ebccf1e3SJoseph Koshy break; 3675ebccf1e3SJoseph Koshy } 3676ebccf1e3SJoseph Koshy 3677ebccf1e3SJoseph Koshy /* 3678ebccf1e3SJoseph Koshy * Treat processes that are in the process of exiting 3679ebccf1e3SJoseph Koshy * as if they were not present. 3680ebccf1e3SJoseph Koshy */ 3681ebccf1e3SJoseph Koshy 3682ebccf1e3SJoseph Koshy if (p->p_flag & P_WEXIT) 3683ebccf1e3SJoseph Koshy error = ESRCH; 3684ebccf1e3SJoseph Koshy 3685ebccf1e3SJoseph Koshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3686ebccf1e3SJoseph Koshy 3687ebccf1e3SJoseph Koshy if (error == 0) 3688ebccf1e3SJoseph Koshy error = pmc_detach_process(p, pm); 3689ebccf1e3SJoseph Koshy } 3690ebccf1e3SJoseph Koshy break; 3691ebccf1e3SJoseph Koshy 3692ebccf1e3SJoseph Koshy 3693ebccf1e3SJoseph Koshy /* 3694f263522aSJoseph Koshy * Retrieve the MSR number associated with the counter 3695f263522aSJoseph Koshy * 'pmc_id'. This allows processes to directly use RDPMC 3696f263522aSJoseph Koshy * instructions to read their PMCs, without the overhead of a 3697f263522aSJoseph Koshy * system call. 3698f263522aSJoseph Koshy */ 3699f263522aSJoseph Koshy 3700f263522aSJoseph Koshy case PMC_OP_PMCGETMSR: 3701f263522aSJoseph Koshy { 3702e829eb6dSJoseph Koshy int adjri, ri; 3703f263522aSJoseph Koshy struct pmc *pm; 3704f263522aSJoseph Koshy struct pmc_target *pt; 3705f263522aSJoseph Koshy struct pmc_op_getmsr gm; 3706e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 3707f263522aSJoseph Koshy 3708f263522aSJoseph Koshy PMC_DOWNGRADE_SX(); 3709f263522aSJoseph Koshy 3710f263522aSJoseph Koshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3711f263522aSJoseph Koshy break; 3712f263522aSJoseph Koshy 3713f263522aSJoseph Koshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3714f263522aSJoseph Koshy break; 3715f263522aSJoseph Koshy 3716f263522aSJoseph Koshy /* 3717f263522aSJoseph Koshy * The allocated PMC has to be a process virtual PMC, 3718f263522aSJoseph Koshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3719f263522aSJoseph Koshy * read using the PMCREAD operation since they may be 3720f263522aSJoseph Koshy * allocated on a different CPU than the one we could 3721f263522aSJoseph Koshy * be running on at the time of the RDPMC instruction. 3722f263522aSJoseph Koshy * 3723f263522aSJoseph Koshy * The GETMSR operation is not allowed for PMCs that 3724f263522aSJoseph Koshy * are inherited across processes. 3725f263522aSJoseph Koshy */ 3726f263522aSJoseph Koshy 3727f263522aSJoseph Koshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3728f263522aSJoseph Koshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3729f263522aSJoseph Koshy error = EINVAL; 3730f263522aSJoseph Koshy break; 3731f263522aSJoseph Koshy } 3732f263522aSJoseph Koshy 3733f263522aSJoseph Koshy /* 3734f263522aSJoseph Koshy * It only makes sense to use a RDPMC (or its 3735f263522aSJoseph Koshy * equivalent instruction on non-x86 architectures) on 3736f263522aSJoseph Koshy * a process that has allocated and attached a PMC to 3737f263522aSJoseph Koshy * itself. Conversely the PMC is only allowed to have 3738f263522aSJoseph Koshy * one process attached to it -- its owner. 3739f263522aSJoseph Koshy */ 3740f263522aSJoseph Koshy 3741f263522aSJoseph Koshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3742f263522aSJoseph Koshy LIST_NEXT(pt, pt_next) != NULL || 3743f263522aSJoseph Koshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3744f263522aSJoseph Koshy error = EINVAL; 3745f263522aSJoseph Koshy break; 3746f263522aSJoseph Koshy } 3747f263522aSJoseph Koshy 3748f263522aSJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 3749e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3750f263522aSJoseph Koshy 3751e829eb6dSJoseph Koshy /* PMC class has no 'GETMSR' support */ 3752e829eb6dSJoseph Koshy if (pcd->pcd_get_msr == NULL) { 3753e829eb6dSJoseph Koshy error = ENOSYS; 3754e829eb6dSJoseph Koshy break; 3755e829eb6dSJoseph Koshy } 3756e829eb6dSJoseph Koshy 3757e829eb6dSJoseph Koshy if ((error = (*pcd->pcd_get_msr)(adjri, &gm.pm_msr)) < 0) 3758f263522aSJoseph Koshy break; 3759f263522aSJoseph Koshy 3760f263522aSJoseph Koshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3761f263522aSJoseph Koshy break; 3762f263522aSJoseph Koshy 3763f263522aSJoseph Koshy /* 3764f263522aSJoseph Koshy * Mark our process as using MSRs. Update machine 3765f263522aSJoseph Koshy * state using a forced context switch. 3766f263522aSJoseph Koshy */ 3767f263522aSJoseph Koshy 3768f263522aSJoseph Koshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3769f263522aSJoseph Koshy pmc_force_context_switch(); 3770f263522aSJoseph Koshy 3771f263522aSJoseph Koshy } 3772f263522aSJoseph Koshy break; 3773f263522aSJoseph Koshy 3774f263522aSJoseph Koshy /* 3775ebccf1e3SJoseph Koshy * Release an allocated PMC 3776ebccf1e3SJoseph Koshy */ 3777ebccf1e3SJoseph Koshy 3778ebccf1e3SJoseph Koshy case PMC_OP_PMCRELEASE: 3779ebccf1e3SJoseph Koshy { 3780ebccf1e3SJoseph Koshy pmc_id_t pmcid; 3781ebccf1e3SJoseph Koshy struct pmc *pm; 3782ebccf1e3SJoseph Koshy struct pmc_owner *po; 3783ebccf1e3SJoseph Koshy struct pmc_op_simple sp; 3784ebccf1e3SJoseph Koshy 3785ebccf1e3SJoseph Koshy /* 3786ebccf1e3SJoseph Koshy * Find PMC pointer for the named PMC. 3787ebccf1e3SJoseph Koshy * 3788ebccf1e3SJoseph Koshy * Use pmc_release_pmc_descriptor() to switch off the 3789ebccf1e3SJoseph Koshy * PMC, remove all its target threads, and remove the 3790ebccf1e3SJoseph Koshy * PMC from its owner's list. 3791ebccf1e3SJoseph Koshy * 3792ebccf1e3SJoseph Koshy * Remove the owner record if this is the last PMC 3793ebccf1e3SJoseph Koshy * owned. 3794ebccf1e3SJoseph Koshy * 3795ebccf1e3SJoseph Koshy * Free up space. 3796ebccf1e3SJoseph Koshy */ 3797ebccf1e3SJoseph Koshy 3798ebccf1e3SJoseph Koshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3799ebccf1e3SJoseph Koshy break; 3800ebccf1e3SJoseph Koshy 3801ebccf1e3SJoseph Koshy pmcid = sp.pm_pmcid; 3802ebccf1e3SJoseph Koshy 3803ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3804ebccf1e3SJoseph Koshy break; 3805ebccf1e3SJoseph Koshy 3806ebccf1e3SJoseph Koshy po = pm->pm_owner; 3807ebccf1e3SJoseph Koshy pmc_release_pmc_descriptor(pm); 3808ebccf1e3SJoseph Koshy pmc_maybe_remove_owner(po); 380906796b67SMark Johnston pmc_destroy_pmc_descriptor(pm); 3810ebccf1e3SJoseph Koshy } 3811ebccf1e3SJoseph Koshy break; 3812ebccf1e3SJoseph Koshy 3813ebccf1e3SJoseph Koshy 3814ebccf1e3SJoseph Koshy /* 3815ebccf1e3SJoseph Koshy * Read and/or write a PMC. 3816ebccf1e3SJoseph Koshy */ 3817ebccf1e3SJoseph Koshy 3818ebccf1e3SJoseph Koshy case PMC_OP_PMCRW: 3819ebccf1e3SJoseph Koshy { 3820e829eb6dSJoseph Koshy int adjri; 3821ebccf1e3SJoseph Koshy struct pmc *pm; 3822e829eb6dSJoseph Koshy uint32_t cpu, ri; 3823ebccf1e3SJoseph Koshy pmc_value_t oldvalue; 3824e829eb6dSJoseph Koshy struct pmc_binding pb; 3825e829eb6dSJoseph Koshy struct pmc_op_pmcrw prw; 3826e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 3827e829eb6dSJoseph Koshy struct pmc_op_pmcrw *pprw; 3828ebccf1e3SJoseph Koshy 3829ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 3830ebccf1e3SJoseph Koshy 3831ebccf1e3SJoseph Koshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3832ebccf1e3SJoseph Koshy break; 3833ebccf1e3SJoseph Koshy 3834869f4a8bSWarner Losh ri = 0; 38354a3690dfSJohn Baldwin PMCDBG2(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3836ebccf1e3SJoseph Koshy prw.pm_flags); 3837ebccf1e3SJoseph Koshy 3838ebccf1e3SJoseph Koshy /* must have at least one flag set */ 3839ebccf1e3SJoseph Koshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3840ebccf1e3SJoseph Koshy error = EINVAL; 3841ebccf1e3SJoseph Koshy break; 3842ebccf1e3SJoseph Koshy } 3843ebccf1e3SJoseph Koshy 3844ebccf1e3SJoseph Koshy /* locate pmc descriptor */ 3845ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3846ebccf1e3SJoseph Koshy break; 3847ebccf1e3SJoseph Koshy 3848ebccf1e3SJoseph Koshy /* Can't read a PMC that hasn't been started. */ 3849ebccf1e3SJoseph Koshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3850ebccf1e3SJoseph Koshy pm->pm_state != PMC_STATE_STOPPED && 3851ebccf1e3SJoseph Koshy pm->pm_state != PMC_STATE_RUNNING) { 3852ebccf1e3SJoseph Koshy error = EINVAL; 3853ebccf1e3SJoseph Koshy break; 3854ebccf1e3SJoseph Koshy } 3855ebccf1e3SJoseph Koshy 3856ebccf1e3SJoseph Koshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3857ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING && 3858ebccf1e3SJoseph Koshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3859ebccf1e3SJoseph Koshy error = EBUSY; 3860ebccf1e3SJoseph Koshy break; 3861ebccf1e3SJoseph Koshy } 3862ebccf1e3SJoseph Koshy 3863c5153e19SJoseph Koshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3864ebccf1e3SJoseph Koshy 3865c5153e19SJoseph Koshy /* 3866c5153e19SJoseph Koshy * If this PMC is attached to its owner (i.e., 3867c5153e19SJoseph Koshy * the process requesting this operation) and 3868c5153e19SJoseph Koshy * is running, then attempt to get an 3869c5153e19SJoseph Koshy * upto-date reading from hardware for a READ. 3870c5153e19SJoseph Koshy * Writes are only allowed when the PMC is 3871c5153e19SJoseph Koshy * stopped, so only update the saved value 3872c5153e19SJoseph Koshy * field. 3873c5153e19SJoseph Koshy * 3874c5153e19SJoseph Koshy * If the PMC is not running, or is not 3875c5153e19SJoseph Koshy * attached to its owner, read/write to the 3876c5153e19SJoseph Koshy * savedvalue field. 3877c5153e19SJoseph Koshy */ 3878c5153e19SJoseph Koshy 3879c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 3880e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3881c5153e19SJoseph Koshy 3882ebccf1e3SJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3883c5153e19SJoseph Koshy cpu = curthread->td_oncpu; 3884c5153e19SJoseph Koshy 3885c5153e19SJoseph Koshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3886c5153e19SJoseph Koshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3887c5153e19SJoseph Koshy (pm->pm_state == PMC_STATE_RUNNING)) 3888e829eb6dSJoseph Koshy error = (*pcd->pcd_read_pmc)(cpu, adjri, 3889c5153e19SJoseph Koshy &oldvalue); 3890c5153e19SJoseph Koshy else 3891ebccf1e3SJoseph Koshy oldvalue = pm->pm_gv.pm_savedvalue; 3892c5153e19SJoseph Koshy } 3893ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_NEWVALUE) 3894ebccf1e3SJoseph Koshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3895c5153e19SJoseph Koshy 3896ebccf1e3SJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3897ebccf1e3SJoseph Koshy 3898ebccf1e3SJoseph Koshy } else { /* System mode PMCs */ 3899c5153e19SJoseph Koshy cpu = PMC_TO_CPU(pm); 3900c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 3901e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 3902ebccf1e3SJoseph Koshy 3903122ccdc1SJoseph Koshy if (!pmc_cpu_is_active(cpu)) { 3904ebccf1e3SJoseph Koshy error = ENXIO; 3905ebccf1e3SJoseph Koshy break; 3906ebccf1e3SJoseph Koshy } 3907ebccf1e3SJoseph Koshy 3908ebccf1e3SJoseph Koshy /* move this thread to CPU 'cpu' */ 3909ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 3910ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 3911ebccf1e3SJoseph Koshy 3912c5153e19SJoseph Koshy critical_enter(); 3913ebccf1e3SJoseph Koshy /* save old value */ 3914ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_OLDVALUE) 3915e829eb6dSJoseph Koshy if ((error = (*pcd->pcd_read_pmc)(cpu, adjri, 3916ebccf1e3SJoseph Koshy &oldvalue))) 3917ebccf1e3SJoseph Koshy goto error; 3918ebccf1e3SJoseph Koshy /* write out new value */ 3919ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_NEWVALUE) 3920e829eb6dSJoseph Koshy error = (*pcd->pcd_write_pmc)(cpu, adjri, 3921ebccf1e3SJoseph Koshy prw.pm_value); 3922ebccf1e3SJoseph Koshy error: 3923c5153e19SJoseph Koshy critical_exit(); 3924ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 3925ebccf1e3SJoseph Koshy if (error) 3926ebccf1e3SJoseph Koshy break; 3927ebccf1e3SJoseph Koshy } 3928ebccf1e3SJoseph Koshy 3929ebccf1e3SJoseph Koshy pprw = (struct pmc_op_pmcrw *) arg; 3930ebccf1e3SJoseph Koshy 3931680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 3932ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_NEWVALUE) 39334a3690dfSJohn Baldwin PMCDBG3(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3934ebccf1e3SJoseph Koshy ri, prw.pm_value, oldvalue); 39359d0a2685SJoseph Koshy else if (prw.pm_flags & PMC_F_OLDVALUE) 39364a3690dfSJohn Baldwin PMCDBG2(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3937ebccf1e3SJoseph Koshy #endif 3938ebccf1e3SJoseph Koshy 3939ebccf1e3SJoseph Koshy /* return old value if requested */ 3940ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_OLDVALUE) 3941ebccf1e3SJoseph Koshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3942ebccf1e3SJoseph Koshy sizeof(prw.pm_value)))) 3943ebccf1e3SJoseph Koshy break; 3944ebccf1e3SJoseph Koshy 3945ebccf1e3SJoseph Koshy } 3946ebccf1e3SJoseph Koshy break; 3947ebccf1e3SJoseph Koshy 3948ebccf1e3SJoseph Koshy 3949ebccf1e3SJoseph Koshy /* 3950ebccf1e3SJoseph Koshy * Set the sampling rate for a sampling mode PMC and the 3951ebccf1e3SJoseph Koshy * initial count for a counting mode PMC. 3952ebccf1e3SJoseph Koshy */ 3953ebccf1e3SJoseph Koshy 3954ebccf1e3SJoseph Koshy case PMC_OP_PMCSETCOUNT: 3955ebccf1e3SJoseph Koshy { 3956ebccf1e3SJoseph Koshy struct pmc *pm; 3957ebccf1e3SJoseph Koshy struct pmc_op_pmcsetcount sc; 3958ebccf1e3SJoseph Koshy 3959ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 3960ebccf1e3SJoseph Koshy 3961ebccf1e3SJoseph Koshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3962ebccf1e3SJoseph Koshy break; 3963ebccf1e3SJoseph Koshy 3964ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3965ebccf1e3SJoseph Koshy break; 3966ebccf1e3SJoseph Koshy 3967ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING) { 3968ebccf1e3SJoseph Koshy error = EBUSY; 3969ebccf1e3SJoseph Koshy break; 3970ebccf1e3SJoseph Koshy } 3971ebccf1e3SJoseph Koshy 3972c5153e19SJoseph Koshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3973ebccf1e3SJoseph Koshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3974ebccf1e3SJoseph Koshy else 3975ebccf1e3SJoseph Koshy pm->pm_sc.pm_initial = sc.pm_count; 3976ebccf1e3SJoseph Koshy } 3977ebccf1e3SJoseph Koshy break; 3978ebccf1e3SJoseph Koshy 3979ebccf1e3SJoseph Koshy 3980ebccf1e3SJoseph Koshy /* 3981ebccf1e3SJoseph Koshy * Start a PMC. 3982ebccf1e3SJoseph Koshy */ 3983ebccf1e3SJoseph Koshy 3984ebccf1e3SJoseph Koshy case PMC_OP_PMCSTART: 3985ebccf1e3SJoseph Koshy { 3986ebccf1e3SJoseph Koshy pmc_id_t pmcid; 3987ebccf1e3SJoseph Koshy struct pmc *pm; 3988ebccf1e3SJoseph Koshy struct pmc_op_simple sp; 3989ebccf1e3SJoseph Koshy 3990ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 3991ebccf1e3SJoseph Koshy 3992ebccf1e3SJoseph Koshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3993ebccf1e3SJoseph Koshy break; 3994ebccf1e3SJoseph Koshy 3995ebccf1e3SJoseph Koshy pmcid = sp.pm_pmcid; 3996ebccf1e3SJoseph Koshy 3997ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3998ebccf1e3SJoseph Koshy break; 3999ebccf1e3SJoseph Koshy 4000c5153e19SJoseph Koshy KASSERT(pmcid == pm->pm_id, 4001c5153e19SJoseph Koshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 4002c5153e19SJoseph Koshy pm->pm_id, pmcid)); 4003ebccf1e3SJoseph Koshy 4004ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 4005ebccf1e3SJoseph Koshy break; 4006ebccf1e3SJoseph Koshy else if (pm->pm_state != PMC_STATE_STOPPED && 4007ebccf1e3SJoseph Koshy pm->pm_state != PMC_STATE_ALLOCATED) { 4008ebccf1e3SJoseph Koshy error = EINVAL; 4009ebccf1e3SJoseph Koshy break; 4010ebccf1e3SJoseph Koshy } 4011ebccf1e3SJoseph Koshy 4012ebccf1e3SJoseph Koshy error = pmc_start(pm); 4013ebccf1e3SJoseph Koshy } 4014ebccf1e3SJoseph Koshy break; 4015ebccf1e3SJoseph Koshy 4016ebccf1e3SJoseph Koshy 4017ebccf1e3SJoseph Koshy /* 4018ebccf1e3SJoseph Koshy * Stop a PMC. 4019ebccf1e3SJoseph Koshy */ 4020ebccf1e3SJoseph Koshy 4021ebccf1e3SJoseph Koshy case PMC_OP_PMCSTOP: 4022ebccf1e3SJoseph Koshy { 4023ebccf1e3SJoseph Koshy pmc_id_t pmcid; 4024ebccf1e3SJoseph Koshy struct pmc *pm; 4025ebccf1e3SJoseph Koshy struct pmc_op_simple sp; 4026ebccf1e3SJoseph Koshy 4027ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 4028ebccf1e3SJoseph Koshy 4029ebccf1e3SJoseph Koshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 4030ebccf1e3SJoseph Koshy break; 4031ebccf1e3SJoseph Koshy 4032ebccf1e3SJoseph Koshy pmcid = sp.pm_pmcid; 4033ebccf1e3SJoseph Koshy 4034ebccf1e3SJoseph Koshy /* 4035ebccf1e3SJoseph Koshy * Mark the PMC as inactive and invoke the MD stop 4036ebccf1e3SJoseph Koshy * routines if needed. 4037ebccf1e3SJoseph Koshy */ 4038ebccf1e3SJoseph Koshy 4039ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 4040ebccf1e3SJoseph Koshy break; 4041ebccf1e3SJoseph Koshy 4042c5153e19SJoseph Koshy KASSERT(pmcid == pm->pm_id, 4043c5153e19SJoseph Koshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 4044c5153e19SJoseph Koshy pm->pm_id, pmcid)); 4045ebccf1e3SJoseph Koshy 4046ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 4047ebccf1e3SJoseph Koshy break; 4048ebccf1e3SJoseph Koshy else if (pm->pm_state != PMC_STATE_RUNNING) { 4049ebccf1e3SJoseph Koshy error = EINVAL; 4050ebccf1e3SJoseph Koshy break; 4051ebccf1e3SJoseph Koshy } 4052ebccf1e3SJoseph Koshy 4053ebccf1e3SJoseph Koshy error = pmc_stop(pm); 4054ebccf1e3SJoseph Koshy } 4055ebccf1e3SJoseph Koshy break; 4056ebccf1e3SJoseph Koshy 4057ebccf1e3SJoseph Koshy 4058ebccf1e3SJoseph Koshy /* 4059fbf1556dSJoseph Koshy * Write a user supplied value to the log file. 4060ebccf1e3SJoseph Koshy */ 4061ebccf1e3SJoseph Koshy 4062ebccf1e3SJoseph Koshy case PMC_OP_WRITELOG: 4063ebccf1e3SJoseph Koshy { 4064f263522aSJoseph Koshy struct pmc_op_writelog wl; 4065f263522aSJoseph Koshy struct pmc_owner *po; 4066ebccf1e3SJoseph Koshy 4067ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 4068ebccf1e3SJoseph Koshy 4069f263522aSJoseph Koshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 4070ebccf1e3SJoseph Koshy break; 4071ebccf1e3SJoseph Koshy 4072f263522aSJoseph Koshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 4073ebccf1e3SJoseph Koshy error = EINVAL; 4074ebccf1e3SJoseph Koshy break; 4075ebccf1e3SJoseph Koshy } 4076ebccf1e3SJoseph Koshy 4077f263522aSJoseph Koshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 4078c5153e19SJoseph Koshy error = EINVAL; 4079c5153e19SJoseph Koshy break; 4080c5153e19SJoseph Koshy } 4081c5153e19SJoseph Koshy 4082f263522aSJoseph Koshy error = pmclog_process_userlog(po, &wl); 4083ebccf1e3SJoseph Koshy } 4084ebccf1e3SJoseph Koshy break; 4085f263522aSJoseph Koshy 4086ebccf1e3SJoseph Koshy 4087ebccf1e3SJoseph Koshy default: 4088ebccf1e3SJoseph Koshy error = EINVAL; 4089ebccf1e3SJoseph Koshy break; 4090ebccf1e3SJoseph Koshy } 4091ebccf1e3SJoseph Koshy 4092ebccf1e3SJoseph Koshy if (is_sx_downgraded) 4093ebccf1e3SJoseph Koshy sx_sunlock(&pmc_sx); 4094ebccf1e3SJoseph Koshy else 4095ebccf1e3SJoseph Koshy sx_xunlock(&pmc_sx); 409620b555e1SKonstantin Belousov done_syscall: 4097ebccf1e3SJoseph Koshy if (error) 4098e6b475e0SMatt Macy counter_u64_add(pmc_stats.pm_syscall_errors, 1); 4099ebccf1e3SJoseph Koshy 4100cf9ef806SKonstantin Belousov return (error); 4101ebccf1e3SJoseph Koshy } 4102ebccf1e3SJoseph Koshy 4103ebccf1e3SJoseph Koshy /* 4104ebccf1e3SJoseph Koshy * Helper functions 4105ebccf1e3SJoseph Koshy */ 4106ebccf1e3SJoseph Koshy 4107f263522aSJoseph Koshy 4108ebccf1e3SJoseph Koshy /* 4109d07f36b0SJoseph Koshy * Mark the thread as needing callchain capture and post an AST. The 4110d07f36b0SJoseph Koshy * actual callchain capture will be done in a context where it is safe 4111d07f36b0SJoseph Koshy * to take page faults. 4112d07f36b0SJoseph Koshy */ 4113d07f36b0SJoseph Koshy 4114d07f36b0SJoseph Koshy static void 41156fe00c78SJoseph Koshy pmc_post_callchain_callback(void) 4116d07f36b0SJoseph Koshy { 4117d07f36b0SJoseph Koshy struct thread *td; 4118d07f36b0SJoseph Koshy 4119d07f36b0SJoseph Koshy td = curthread; 4120d07f36b0SJoseph Koshy 41210e031404SFabien Thomas /* 41220e031404SFabien Thomas * If there is multiple PMCs for the same interrupt ignore new post 41230e031404SFabien Thomas */ 41240e031404SFabien Thomas if (td->td_pflags & TDP_CALLCHAIN) 41250e031404SFabien Thomas return; 41266fe00c78SJoseph Koshy 4127d07f36b0SJoseph Koshy /* 41286fe00c78SJoseph Koshy * Mark this thread as needing callchain capture. 41296fe00c78SJoseph Koshy * `td->td_pflags' will be safe to touch because this thread 41306fe00c78SJoseph Koshy * was in user space when it was interrupted. 4131d07f36b0SJoseph Koshy */ 4132d07f36b0SJoseph Koshy td->td_pflags |= TDP_CALLCHAIN; 4133d07f36b0SJoseph Koshy 4134d07f36b0SJoseph Koshy /* 41356fe00c78SJoseph Koshy * Don't let this thread migrate between CPUs until callchain 41366fe00c78SJoseph Koshy * capture completes. 4137d07f36b0SJoseph Koshy */ 41386fe00c78SJoseph Koshy sched_pin(); 4139d07f36b0SJoseph Koshy 4140d07f36b0SJoseph Koshy return; 4141d07f36b0SJoseph Koshy } 4142d07f36b0SJoseph Koshy 4143d07f36b0SJoseph Koshy /* 4144f263522aSJoseph Koshy * Interrupt processing. 4145f263522aSJoseph Koshy * 4146d07f36b0SJoseph Koshy * Find a free slot in the per-cpu array of samples and capture the 4147d07f36b0SJoseph Koshy * current callchain there. If a sample was successfully added, a bit 4148d07f36b0SJoseph Koshy * is set in mask 'pmc_cpumask' denoting that the DO_SAMPLES hook 4149d07f36b0SJoseph Koshy * needs to be invoked from the clock handler. 4150f263522aSJoseph Koshy * 4151f263522aSJoseph Koshy * This function is meant to be called from an NMI handler. It cannot 4152f263522aSJoseph Koshy * use any of the locking primitives supplied by the OS. 4153ebccf1e3SJoseph Koshy */ 4154ebccf1e3SJoseph Koshy 4155f263522aSJoseph Koshy int 4156f5f9340bSFabien Thomas pmc_process_interrupt(int cpu, int ring, struct pmc *pm, struct trapframe *tf, 4157d07f36b0SJoseph Koshy int inuserspace) 4158ebccf1e3SJoseph Koshy { 4159d07f36b0SJoseph Koshy int error, callchaindepth; 4160f263522aSJoseph Koshy struct thread *td; 4161f263522aSJoseph Koshy struct pmc_sample *ps; 4162f263522aSJoseph Koshy struct pmc_samplebuffer *psb; 4163ebccf1e3SJoseph Koshy 4164f263522aSJoseph Koshy error = 0; 4165ebccf1e3SJoseph Koshy 4166d07f36b0SJoseph Koshy /* 4167d07f36b0SJoseph Koshy * Allocate space for a sample buffer. 4168d07f36b0SJoseph Koshy */ 4169f5f9340bSFabien Thomas psb = pmc_pcpu[cpu]->pc_sb[ring]; 4170ebccf1e3SJoseph Koshy 4171f263522aSJoseph Koshy ps = psb->ps_write; 4172d07f36b0SJoseph Koshy if (ps->ps_nsamples) { /* in use, reader hasn't caught up */ 4173e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_stalled = 1; 4174e6b475e0SMatt Macy counter_u64_add(pmc_stats.pm_intr_bufferfull, 1); 41754a3690dfSJohn Baldwin PMCDBG6(SAM,INT,1,"(spc) cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", 4176d07f36b0SJoseph Koshy cpu, pm, (void *) tf, inuserspace, 4177f263522aSJoseph Koshy (int) (psb->ps_write - psb->ps_samples), 4178f263522aSJoseph Koshy (int) (psb->ps_read - psb->ps_samples)); 4179c66ea2eeSJonathan T. Looney callchaindepth = 1; 4180f263522aSJoseph Koshy error = ENOMEM; 4181f263522aSJoseph Koshy goto done; 4182ebccf1e3SJoseph Koshy } 4183ebccf1e3SJoseph Koshy 4184d07f36b0SJoseph Koshy 4185d07f36b0SJoseph Koshy /* Fill in entry. */ 41864a3690dfSJohn Baldwin PMCDBG6(SAM,INT,1,"cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", cpu, pm, 4187d07f36b0SJoseph Koshy (void *) tf, inuserspace, 4188f263522aSJoseph Koshy (int) (psb->ps_write - psb->ps_samples), 4189f263522aSJoseph Koshy (int) (psb->ps_read - psb->ps_samples)); 4190f263522aSJoseph Koshy 4191e6b475e0SMatt Macy KASSERT(counter_u64_fetch(pm->pm_runcount) >= 0, 4192e6b475e0SMatt Macy ("[pmc,%d] pm=%p runcount %ld", __LINE__, (void *) pm, 4193e6b475e0SMatt Macy (unsigned long)counter_u64_fetch(pm->pm_runcount))); 41946fe00c78SJoseph Koshy 4195e6b475e0SMatt Macy counter_u64_add(pm->pm_runcount, 1); /* hold onto PMC */ 4196f5f9340bSFabien Thomas 4197f263522aSJoseph Koshy ps->ps_pmc = pm; 4198f263522aSJoseph Koshy if ((td = curthread) && td->td_proc) 4199f263522aSJoseph Koshy ps->ps_pid = td->td_proc->p_pid; 4200f263522aSJoseph Koshy else 4201f263522aSJoseph Koshy ps->ps_pid = -1; 4202d07f36b0SJoseph Koshy ps->ps_cpu = cpu; 42036fe00c78SJoseph Koshy ps->ps_td = td; 4204d07f36b0SJoseph Koshy ps->ps_flags = inuserspace ? PMC_CC_F_USERSPACE : 0; 4205d07f36b0SJoseph Koshy 4206d07f36b0SJoseph Koshy callchaindepth = (pm->pm_flags & PMC_F_CALLCHAIN) ? 4207d07f36b0SJoseph Koshy pmc_callchaindepth : 1; 4208d07f36b0SJoseph Koshy 4209d07f36b0SJoseph Koshy if (callchaindepth == 1) 4210d07f36b0SJoseph Koshy ps->ps_pc[0] = PMC_TRAPFRAME_TO_PC(tf); 4211d07f36b0SJoseph Koshy else { 4212d07f36b0SJoseph Koshy /* 4213d07f36b0SJoseph Koshy * Kernel stack traversals can be done immediately, 4214d07f36b0SJoseph Koshy * while we defer to an AST for user space traversals. 4215d07f36b0SJoseph Koshy */ 4216f5f9340bSFabien Thomas if (!inuserspace) { 4217d07f36b0SJoseph Koshy callchaindepth = 4218d07f36b0SJoseph Koshy pmc_save_kernel_callchain(ps->ps_pc, 4219d07f36b0SJoseph Koshy callchaindepth, tf); 4220f5f9340bSFabien Thomas } else { 42216fe00c78SJoseph Koshy pmc_post_callchain_callback(); 4222d07f36b0SJoseph Koshy callchaindepth = PMC_SAMPLE_INUSE; 4223d07f36b0SJoseph Koshy } 4224d07f36b0SJoseph Koshy } 4225d07f36b0SJoseph Koshy 4226d07f36b0SJoseph Koshy ps->ps_nsamples = callchaindepth; /* mark entry as in use */ 4227f263522aSJoseph Koshy 4228f263522aSJoseph Koshy /* increment write pointer, modulo ring buffer size */ 4229f263522aSJoseph Koshy ps++; 4230f263522aSJoseph Koshy if (ps == psb->ps_fence) 4231f263522aSJoseph Koshy psb->ps_write = psb->ps_samples; 4232f263522aSJoseph Koshy else 4233f263522aSJoseph Koshy psb->ps_write = ps; 4234f263522aSJoseph Koshy 4235f263522aSJoseph Koshy done: 4236f263522aSJoseph Koshy /* mark CPU as needing processing */ 4237c66ea2eeSJonathan T. Looney if (callchaindepth != PMC_SAMPLE_INUSE) 4238e6b475e0SMatt Macy DPCPU_SET(pmc_sampled, 1); 4239f263522aSJoseph Koshy 4240d07f36b0SJoseph Koshy return (error); 4241d07f36b0SJoseph Koshy } 4242d07f36b0SJoseph Koshy 4243d07f36b0SJoseph Koshy /* 4244d07f36b0SJoseph Koshy * Capture a user call chain. This function will be called from ast() 4245d07f36b0SJoseph Koshy * before control returns to userland and before the process gets 4246d07f36b0SJoseph Koshy * rescheduled. 4247d07f36b0SJoseph Koshy */ 4248d07f36b0SJoseph Koshy 4249d07f36b0SJoseph Koshy static void 4250f5f9340bSFabien Thomas pmc_capture_user_callchain(int cpu, int ring, struct trapframe *tf) 4251d07f36b0SJoseph Koshy { 4252d07f36b0SJoseph Koshy struct pmc *pm; 42536fe00c78SJoseph Koshy struct thread *td; 4254c66ea2eeSJonathan T. Looney struct pmc_sample *ps, *ps_end; 4255d07f36b0SJoseph Koshy struct pmc_samplebuffer *psb; 42566fe00c78SJoseph Koshy #ifdef INVARIANTS 42576fe00c78SJoseph Koshy int ncallchains; 42587bc7e3cdSAndrew Turner int nfree; 42596fe00c78SJoseph Koshy #endif 42606fe00c78SJoseph Koshy 4261f5f9340bSFabien Thomas psb = pmc_pcpu[cpu]->pc_sb[ring]; 42626fe00c78SJoseph Koshy td = curthread; 42636fe00c78SJoseph Koshy 42646fe00c78SJoseph Koshy KASSERT(td->td_pflags & TDP_CALLCHAIN, 42656fe00c78SJoseph Koshy ("[pmc,%d] Retrieving callchain for thread that doesn't want it", 42666fe00c78SJoseph Koshy __LINE__)); 42676fe00c78SJoseph Koshy 42686fe00c78SJoseph Koshy #ifdef INVARIANTS 42696fe00c78SJoseph Koshy ncallchains = 0; 42707bc7e3cdSAndrew Turner nfree = 0; 42716fe00c78SJoseph Koshy #endif 4272d07f36b0SJoseph Koshy 4273d07f36b0SJoseph Koshy /* 4274d07f36b0SJoseph Koshy * Iterate through all deferred callchain requests. 4275c66ea2eeSJonathan T. Looney * Walk from the current read pointer to the current 4276c66ea2eeSJonathan T. Looney * write pointer. 4277d07f36b0SJoseph Koshy */ 4278d07f36b0SJoseph Koshy 4279c66ea2eeSJonathan T. Looney ps = psb->ps_read; 4280c66ea2eeSJonathan T. Looney ps_end = psb->ps_write; 4281c66ea2eeSJonathan T. Looney do { 42827bc7e3cdSAndrew Turner #ifdef INVARIANTS 42836cb40391SZbigniew Bodek if ((ps->ps_pmc == NULL) || 42846cb40391SZbigniew Bodek (ps->ps_pmc->pm_state != PMC_STATE_RUNNING)) 42857bc7e3cdSAndrew Turner nfree++; 42867bc7e3cdSAndrew Turner #endif 4287d07f36b0SJoseph Koshy if (ps->ps_nsamples != PMC_SAMPLE_INUSE) 4288c66ea2eeSJonathan T. Looney goto next; 42896fe00c78SJoseph Koshy if (ps->ps_td != td) 4290c66ea2eeSJonathan T. Looney goto next; 42916fe00c78SJoseph Koshy 42926fe00c78SJoseph Koshy KASSERT(ps->ps_cpu == cpu, 42936fe00c78SJoseph Koshy ("[pmc,%d] cpu mismatch ps_cpu=%d pcpu=%d", __LINE__, 42946fe00c78SJoseph Koshy ps->ps_cpu, PCPU_GET(cpuid))); 4295d07f36b0SJoseph Koshy 4296d07f36b0SJoseph Koshy pm = ps->ps_pmc; 4297d07f36b0SJoseph Koshy 4298d07f36b0SJoseph Koshy KASSERT(pm->pm_flags & PMC_F_CALLCHAIN, 4299d07f36b0SJoseph Koshy ("[pmc,%d] Retrieving callchain for PMC that doesn't " 4300d07f36b0SJoseph Koshy "want it", __LINE__)); 4301d07f36b0SJoseph Koshy 4302e6b475e0SMatt Macy KASSERT(counter_u64_fetch(pm->pm_runcount) > 0, 4303e6b475e0SMatt Macy ("[pmc,%d] runcount %ld", __LINE__, (unsigned long)counter_u64_fetch(pm->pm_runcount))); 43046fe00c78SJoseph Koshy 4305d07f36b0SJoseph Koshy /* 4306d07f36b0SJoseph Koshy * Retrieve the callchain and mark the sample buffer 4307d07f36b0SJoseph Koshy * as 'processable' by the timer tick sweep code. 4308d07f36b0SJoseph Koshy */ 4309d07f36b0SJoseph Koshy ps->ps_nsamples = pmc_save_user_callchain(ps->ps_pc, 4310d07f36b0SJoseph Koshy pmc_callchaindepth, tf); 43116fe00c78SJoseph Koshy 43126fe00c78SJoseph Koshy #ifdef INVARIANTS 43136fe00c78SJoseph Koshy ncallchains++; 43146fe00c78SJoseph Koshy #endif 4315c66ea2eeSJonathan T. Looney 4316c66ea2eeSJonathan T. Looney next: 4317c66ea2eeSJonathan T. Looney /* increment the pointer, modulo sample ring size */ 4318c66ea2eeSJonathan T. Looney if (++ps == psb->ps_fence) 4319c66ea2eeSJonathan T. Looney ps = psb->ps_samples; 4320c66ea2eeSJonathan T. Looney } while (ps != ps_end); 4321d07f36b0SJoseph Koshy 43226cb40391SZbigniew Bodek #ifdef INVARIANTS 43237bc7e3cdSAndrew Turner KASSERT(ncallchains > 0 || nfree > 0, 43246fe00c78SJoseph Koshy ("[pmc,%d] cpu %d didn't find a sample to collect", __LINE__, 43256fe00c78SJoseph Koshy cpu)); 43266cb40391SZbigniew Bodek #endif 43276fe00c78SJoseph Koshy 43285584e917SAttilio Rao KASSERT(td->td_pinned == 1, 4329f5f9340bSFabien Thomas ("[pmc,%d] invalid td_pinned value", __LINE__)); 4330f5f9340bSFabien Thomas sched_unpin(); /* Can migrate safely now. */ 4331f5f9340bSFabien Thomas 4332c66ea2eeSJonathan T. Looney /* mark CPU as needing processing */ 4333e6b475e0SMatt Macy DPCPU_SET(pmc_sampled, 1); 4334f263522aSJoseph Koshy } 4335f263522aSJoseph Koshy 4336ebccf1e3SJoseph Koshy /* 4337f263522aSJoseph Koshy * Process saved PC samples. 4338ebccf1e3SJoseph Koshy */ 4339ebccf1e3SJoseph Koshy 4340ebccf1e3SJoseph Koshy static void 4341f5f9340bSFabien Thomas pmc_process_samples(int cpu, int ring) 4342ebccf1e3SJoseph Koshy { 4343f263522aSJoseph Koshy struct pmc *pm; 43440cfab8ddSJoseph Koshy int adjri, n; 4345f263522aSJoseph Koshy struct thread *td; 4346f263522aSJoseph Koshy struct pmc_owner *po; 4347f263522aSJoseph Koshy struct pmc_sample *ps; 4348e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 4349f263522aSJoseph Koshy struct pmc_samplebuffer *psb; 4350ebccf1e3SJoseph Koshy 4351f263522aSJoseph Koshy KASSERT(PCPU_GET(cpuid) == cpu, 4352f263522aSJoseph Koshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 4353f263522aSJoseph Koshy PCPU_GET(cpuid), cpu)); 4354ebccf1e3SJoseph Koshy 4355f5f9340bSFabien Thomas psb = pmc_pcpu[cpu]->pc_sb[ring]; 4356f263522aSJoseph Koshy 4357f263522aSJoseph Koshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 4358f263522aSJoseph Koshy 4359f263522aSJoseph Koshy ps = psb->ps_read; 4360d07f36b0SJoseph Koshy if (ps->ps_nsamples == PMC_SAMPLE_FREE) 4361f263522aSJoseph Koshy break; 4362f263522aSJoseph Koshy 4363f263522aSJoseph Koshy pm = ps->ps_pmc; 43646fe00c78SJoseph Koshy 4365e6b475e0SMatt Macy KASSERT(counter_u64_fetch(pm->pm_runcount) > 0, 4366e6b475e0SMatt Macy ("[pmc,%d] pm=%p runcount %ld", __LINE__, (void *) pm, 4367e6b475e0SMatt Macy (unsigned long)counter_u64_fetch(pm->pm_runcount))); 43686fe00c78SJoseph Koshy 4369f263522aSJoseph Koshy po = pm->pm_owner; 4370f263522aSJoseph Koshy 4371f263522aSJoseph Koshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 4372f263522aSJoseph Koshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 4373f263522aSJoseph Koshy pm, PMC_TO_MODE(pm))); 4374f263522aSJoseph Koshy 4375f263522aSJoseph Koshy /* Ignore PMCs that have been switched off */ 4376f263522aSJoseph Koshy if (pm->pm_state != PMC_STATE_RUNNING) 4377f263522aSJoseph Koshy goto entrydone; 4378f263522aSJoseph Koshy 4379f5f9340bSFabien Thomas /* If there is a pending AST wait for completion */ 4380f5f9340bSFabien Thomas if (ps->ps_nsamples == PMC_SAMPLE_INUSE) { 4381f5f9340bSFabien Thomas /* Need a rescan at a later time. */ 4382e6b475e0SMatt Macy DPCPU_SET(pmc_sampled, 1); 4383f5f9340bSFabien Thomas break; 4384f5f9340bSFabien Thomas } 4385f5f9340bSFabien Thomas 43864a3690dfSJohn Baldwin PMCDBG6(SAM,OPS,1,"cpu=%d pm=%p n=%d fl=%x wr=%d rd=%d", cpu, 4387d07f36b0SJoseph Koshy pm, ps->ps_nsamples, ps->ps_flags, 4388f263522aSJoseph Koshy (int) (psb->ps_write - psb->ps_samples), 4389f263522aSJoseph Koshy (int) (psb->ps_read - psb->ps_samples)); 4390f263522aSJoseph Koshy 4391f263522aSJoseph Koshy /* 4392f263522aSJoseph Koshy * If this is a process-mode PMC that is attached to 4393f263522aSJoseph Koshy * its owner, and if the PC is in user mode, update 4394f263522aSJoseph Koshy * profiling statistics like timer-based profiling 4395f263522aSJoseph Koshy * would have done. 4396f263522aSJoseph Koshy */ 4397f263522aSJoseph Koshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 4398d07f36b0SJoseph Koshy if (ps->ps_flags & PMC_CC_F_USERSPACE) { 4399f263522aSJoseph Koshy td = FIRST_THREAD_IN_PROC(po->po_owner); 4400d07f36b0SJoseph Koshy addupc_intr(td, ps->ps_pc[0], 1); 4401f263522aSJoseph Koshy } 4402f263522aSJoseph Koshy goto entrydone; 4403f263522aSJoseph Koshy } 4404f263522aSJoseph Koshy 4405f263522aSJoseph Koshy /* 4406f263522aSJoseph Koshy * Otherwise, this is either a sampling mode PMC that 4407f263522aSJoseph Koshy * is attached to a different process than its owner, 4408f263522aSJoseph Koshy * or a system-wide sampling PMC. Dispatch a log 4409f263522aSJoseph Koshy * entry to the PMC's owner process. 4410f263522aSJoseph Koshy */ 4411d07f36b0SJoseph Koshy pmclog_process_callchain(pm, ps); 4412f263522aSJoseph Koshy 4413f263522aSJoseph Koshy entrydone: 4414d07f36b0SJoseph Koshy ps->ps_nsamples = 0; /* mark entry as free */ 4415e6b475e0SMatt Macy counter_u64_add(pm->pm_runcount, -1); 4416f263522aSJoseph Koshy 4417f263522aSJoseph Koshy /* increment read pointer, modulo sample size */ 4418f263522aSJoseph Koshy if (++ps == psb->ps_fence) 4419f263522aSJoseph Koshy psb->ps_read = psb->ps_samples; 4420f263522aSJoseph Koshy else 4421f263522aSJoseph Koshy psb->ps_read = ps; 4422f263522aSJoseph Koshy } 4423f263522aSJoseph Koshy 4424e6b475e0SMatt Macy counter_u64_add(pmc_stats.pm_log_sweeps, 1); 4425f263522aSJoseph Koshy 4426f263522aSJoseph Koshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 4427f263522aSJoseph Koshy if (n == 0) 4428ebccf1e3SJoseph Koshy return; 4429f263522aSJoseph Koshy 4430f263522aSJoseph Koshy /* 4431f263522aSJoseph Koshy * Restart any stalled sampling PMCs on this CPU. 4432f263522aSJoseph Koshy * 4433fbf1556dSJoseph Koshy * If the NMI handler sets the pm_stalled field of a PMC after 4434fbf1556dSJoseph Koshy * the check below, we'll end up processing the stalled PMC at 4435fbf1556dSJoseph Koshy * the next hardclock tick. 4436f263522aSJoseph Koshy */ 4437f263522aSJoseph Koshy for (n = 0; n < md->pmd_npmc; n++) { 4438e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, n, &adjri); 4439e829eb6dSJoseph Koshy KASSERT(pcd != NULL, 4440e829eb6dSJoseph Koshy ("[pmc,%d] null pcd ri=%d", __LINE__, n)); 4441e829eb6dSJoseph Koshy (void) (*pcd->pcd_get_config)(cpu,adjri,&pm); 4442e829eb6dSJoseph Koshy 4443f263522aSJoseph Koshy if (pm == NULL || /* !cfg'ed */ 4444f263522aSJoseph Koshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 4445f263522aSJoseph Koshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 4446e6b475e0SMatt Macy !pm->pm_pcpu_state[cpu].pps_cpustate || /* !desired */ 4447e6b475e0SMatt Macy !pm->pm_pcpu_state[cpu].pps_stalled) /* !stalled */ 4448f263522aSJoseph Koshy continue; 4449f263522aSJoseph Koshy 4450e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_stalled = 0; 4451e829eb6dSJoseph Koshy (*pcd->pcd_start_pmc)(cpu, adjri); 4452f263522aSJoseph Koshy } 4453ebccf1e3SJoseph Koshy } 4454ebccf1e3SJoseph Koshy 4455ebccf1e3SJoseph Koshy /* 4456ebccf1e3SJoseph Koshy * Event handlers. 4457ebccf1e3SJoseph Koshy */ 4458ebccf1e3SJoseph Koshy 4459ebccf1e3SJoseph Koshy /* 4460ebccf1e3SJoseph Koshy * Handle a process exit. 4461ebccf1e3SJoseph Koshy * 4462f263522aSJoseph Koshy * Remove this process from all hash tables. If this process 4463f263522aSJoseph Koshy * owned any PMCs, turn off those PMCs and deallocate them, 4464f263522aSJoseph Koshy * removing any associations with target processes. 4465f263522aSJoseph Koshy * 4466f263522aSJoseph Koshy * This function will be called by the last 'thread' of a 4467f263522aSJoseph Koshy * process. 4468f263522aSJoseph Koshy * 4469ebccf1e3SJoseph Koshy * XXX This eventhandler gets called early in the exit process. 4470ebccf1e3SJoseph Koshy * Consider using a 'hook' invocation from thread_exit() or equivalent 4471ebccf1e3SJoseph Koshy * spot. Another negative is that kse_exit doesn't seem to call 4472ebccf1e3SJoseph Koshy * exit1() [??]. 4473f263522aSJoseph Koshy * 4474ebccf1e3SJoseph Koshy */ 4475ebccf1e3SJoseph Koshy 4476ebccf1e3SJoseph Koshy static void 4477ebccf1e3SJoseph Koshy pmc_process_exit(void *arg __unused, struct proc *p) 4478ebccf1e3SJoseph Koshy { 4479f263522aSJoseph Koshy struct pmc *pm; 4480e829eb6dSJoseph Koshy int adjri, cpu; 4481e829eb6dSJoseph Koshy unsigned int ri; 4482e829eb6dSJoseph Koshy int is_using_hwpmcs; 4483f263522aSJoseph Koshy struct pmc_owner *po; 4484e829eb6dSJoseph Koshy struct pmc_process *pp; 4485e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 4486f263522aSJoseph Koshy pmc_value_t newvalue, tmp; 4487ebccf1e3SJoseph Koshy 4488ebccf1e3SJoseph Koshy PROC_LOCK(p); 4489ebccf1e3SJoseph Koshy is_using_hwpmcs = p->p_flag & P_HWPMC; 4490ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 4491ebccf1e3SJoseph Koshy 4492f263522aSJoseph Koshy /* 4493f263522aSJoseph Koshy * Log a sysexit event to all SS PMC owners. 4494f263522aSJoseph Koshy */ 4495*0f00315cSMatt Macy epoch_enter(global_epoch); 4496*0f00315cSMatt Macy CK_LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4497f263522aSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4498f263522aSJoseph Koshy pmclog_process_sysexit(po, p->p_pid); 4499*0f00315cSMatt Macy epoch_exit(global_epoch); 4500f263522aSJoseph Koshy 4501f263522aSJoseph Koshy if (!is_using_hwpmcs) 4502f263522aSJoseph Koshy return; 4503f263522aSJoseph Koshy 4504f263522aSJoseph Koshy PMC_GET_SX_XLOCK(); 45054a3690dfSJohn Baldwin PMCDBG3(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 4506ebccf1e3SJoseph Koshy p->p_comm); 4507ebccf1e3SJoseph Koshy 4508f263522aSJoseph Koshy /* 4509f263522aSJoseph Koshy * Since this code is invoked by the last thread in an exiting 4510f263522aSJoseph Koshy * process, we would have context switched IN at some prior 4511f263522aSJoseph Koshy * point. However, with PREEMPTION, kernel mode context 4512f263522aSJoseph Koshy * switches may happen any time, so we want to disable a 4513b790c193SPedro F. Giffuni * context switch OUT till we get any PMCs targeting this 4514f263522aSJoseph Koshy * process off the hardware. 4515f263522aSJoseph Koshy * 4516f263522aSJoseph Koshy * We also need to atomically remove this process' 4517f263522aSJoseph Koshy * entry from our target process hash table, using 4518f263522aSJoseph Koshy * PMC_FLAG_REMOVE. 4519f263522aSJoseph Koshy */ 45204a3690dfSJohn Baldwin PMCDBG3(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 4521f263522aSJoseph Koshy p->p_comm); 4522f263522aSJoseph Koshy 4523f263522aSJoseph Koshy critical_enter(); /* no preemption */ 4524f263522aSJoseph Koshy 4525f263522aSJoseph Koshy cpu = curthread->td_oncpu; 4526f263522aSJoseph Koshy 4527f263522aSJoseph Koshy if ((pp = pmc_find_process_descriptor(p, 4528f263522aSJoseph Koshy PMC_FLAG_REMOVE)) != NULL) { 4529f263522aSJoseph Koshy 45304a3690dfSJohn Baldwin PMCDBG2(PRC,EXT,2, 4531f263522aSJoseph Koshy "process-exit proc=%p pmc-process=%p", p, pp); 4532f263522aSJoseph Koshy 4533f263522aSJoseph Koshy /* 4534f263522aSJoseph Koshy * The exiting process could the target of 4535f263522aSJoseph Koshy * some PMCs which will be running on 4536f263522aSJoseph Koshy * currently executing CPU. 4537f263522aSJoseph Koshy * 4538f263522aSJoseph Koshy * We need to turn these PMCs off like we 4539f263522aSJoseph Koshy * would do at context switch OUT time. 4540f263522aSJoseph Koshy */ 4541f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) { 4542f263522aSJoseph Koshy 4543f263522aSJoseph Koshy /* 4544f263522aSJoseph Koshy * Pick up the pmc pointer from hardware 4545f263522aSJoseph Koshy * state similar to the CSW_OUT code. 4546f263522aSJoseph Koshy */ 4547f263522aSJoseph Koshy pm = NULL; 4548e829eb6dSJoseph Koshy 4549e829eb6dSJoseph Koshy pcd = pmc_ri_to_classdep(md, ri, &adjri); 4550e829eb6dSJoseph Koshy 4551e829eb6dSJoseph Koshy (void) (*pcd->pcd_get_config)(cpu, adjri, &pm); 4552f263522aSJoseph Koshy 45534a3690dfSJohn Baldwin PMCDBG2(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 4554f263522aSJoseph Koshy 4555f263522aSJoseph Koshy if (pm == NULL || 4556f263522aSJoseph Koshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 4557f263522aSJoseph Koshy continue; 4558f263522aSJoseph Koshy 45594a3690dfSJohn Baldwin PMCDBG4(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 4560f263522aSJoseph Koshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 4561f263522aSJoseph Koshy pm, pm->pm_state); 4562f263522aSJoseph Koshy 4563f263522aSJoseph Koshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 4564f263522aSJoseph Koshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 4565f263522aSJoseph Koshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 4566f263522aSJoseph Koshy 4567f263522aSJoseph Koshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 4568f263522aSJoseph Koshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 4569f263522aSJoseph Koshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 4570f263522aSJoseph Koshy 4571e6b475e0SMatt Macy KASSERT(counter_u64_fetch(pm->pm_runcount) > 0, 4572e6b475e0SMatt Macy ("[pmc,%d] bad runcount ri %d rc %ld", 4573e6b475e0SMatt Macy __LINE__, ri, (unsigned long)counter_u64_fetch(pm->pm_runcount))); 4574f263522aSJoseph Koshy 4575a3924968SJonathan T. Looney /* 4576a3924968SJonathan T. Looney * Change desired state, and then stop if not 4577a3924968SJonathan T. Looney * stalled. This two-step dance should avoid 4578a3924968SJonathan T. Looney * race conditions where an interrupt re-enables 4579a3924968SJonathan T. Looney * the PMC after this code has already checked 4580a3924968SJonathan T. Looney * the pm_stalled flag. 4581a3924968SJonathan T. Looney */ 4582e6b475e0SMatt Macy if (pm->pm_pcpu_state[cpu].pps_cpustate) { 4583e6b475e0SMatt Macy pm->pm_pcpu_state[cpu].pps_cpustate = 0; 4584e6b475e0SMatt Macy if (!pm->pm_pcpu_state[cpu].pps_stalled) { 4585a3924968SJonathan T. Looney (void) pcd->pcd_stop_pmc(cpu, adjri); 4586a3924968SJonathan T. Looney pcd->pcd_read_pmc(cpu, adjri, 4587a3924968SJonathan T. Looney &newvalue); 4588f263522aSJoseph Koshy tmp = newvalue - 4589f263522aSJoseph Koshy PMC_PCPU_SAVED(cpu,ri); 4590f263522aSJoseph Koshy 4591f263522aSJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 4592f263522aSJoseph Koshy pm->pm_gv.pm_savedvalue += tmp; 4593f263522aSJoseph Koshy pp->pp_pmcs[ri].pp_pmcval += tmp; 4594f263522aSJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 4595ebccf1e3SJoseph Koshy } 4596a3924968SJonathan T. Looney } 4597f263522aSJoseph Koshy 4598e6b475e0SMatt Macy counter_u64_add(pm->pm_runcount, -1); 4599f263522aSJoseph Koshy 4600e6b475e0SMatt Macy KASSERT((int) counter_u64_fetch(pm->pm_runcount) >= 0, 4601f263522aSJoseph Koshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 4602f263522aSJoseph Koshy 4603e829eb6dSJoseph Koshy (void) pcd->pcd_config_pmc(cpu, adjri, NULL); 4604f263522aSJoseph Koshy } 4605f263522aSJoseph Koshy 4606f263522aSJoseph Koshy /* 4607f263522aSJoseph Koshy * Inform the MD layer of this pseudo "context switch 4608f263522aSJoseph Koshy * out" 4609f263522aSJoseph Koshy */ 4610f263522aSJoseph Koshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 4611f263522aSJoseph Koshy 4612f263522aSJoseph Koshy critical_exit(); /* ok to be pre-empted now */ 4613f263522aSJoseph Koshy 4614f263522aSJoseph Koshy /* 4615f263522aSJoseph Koshy * Unlink this process from the PMCs that are 4616b790c193SPedro F. Giffuni * targeting it. This will send a signal to 4617f263522aSJoseph Koshy * all PMC owner's whose PMCs are orphaned. 4618f263522aSJoseph Koshy * 4619f263522aSJoseph Koshy * Log PMC value at exit time if requested. 4620f263522aSJoseph Koshy */ 4621f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 4622f263522aSJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 4623fbf1556dSJoseph Koshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 4624fbf1556dSJoseph Koshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 4625f263522aSJoseph Koshy pmclog_process_procexit(pm, pp); 4626f263522aSJoseph Koshy pmc_unlink_target_process(pm, pp); 4627f263522aSJoseph Koshy } 46281ede983cSDag-Erling Smørgrav free(pp, M_PMC); 4629f263522aSJoseph Koshy 4630f263522aSJoseph Koshy } else 4631f263522aSJoseph Koshy critical_exit(); /* pp == NULL */ 4632f263522aSJoseph Koshy 4633f263522aSJoseph Koshy 4634f263522aSJoseph Koshy /* 4635f263522aSJoseph Koshy * If the process owned PMCs, free them up and free up 4636f263522aSJoseph Koshy * memory. 4637f263522aSJoseph Koshy */ 4638f263522aSJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 4639f263522aSJoseph Koshy pmc_remove_owner(po); 4640f263522aSJoseph Koshy pmc_destroy_owner_descriptor(po); 4641f263522aSJoseph Koshy } 4642f263522aSJoseph Koshy 4643f263522aSJoseph Koshy sx_xunlock(&pmc_sx); 4644ebccf1e3SJoseph Koshy } 4645ebccf1e3SJoseph Koshy 4646ebccf1e3SJoseph Koshy /* 4647ebccf1e3SJoseph Koshy * Handle a process fork. 4648ebccf1e3SJoseph Koshy * 4649ebccf1e3SJoseph Koshy * If the parent process 'p1' is under HWPMC monitoring, then copy 4650ebccf1e3SJoseph Koshy * over any attached PMCs that have 'do_descendants' semantics. 4651ebccf1e3SJoseph Koshy */ 4652ebccf1e3SJoseph Koshy 4653ebccf1e3SJoseph Koshy static void 4654f263522aSJoseph Koshy pmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 4655ebccf1e3SJoseph Koshy int flags) 4656ebccf1e3SJoseph Koshy { 4657ebccf1e3SJoseph Koshy int is_using_hwpmcs; 4658f263522aSJoseph Koshy unsigned int ri; 4659f263522aSJoseph Koshy uint32_t do_descendants; 4660f263522aSJoseph Koshy struct pmc *pm; 4661f263522aSJoseph Koshy struct pmc_owner *po; 4662f263522aSJoseph Koshy struct pmc_process *ppnew, *ppold; 4663ebccf1e3SJoseph Koshy 4664ebccf1e3SJoseph Koshy (void) flags; /* unused parameter */ 4665ebccf1e3SJoseph Koshy 4666ebccf1e3SJoseph Koshy PROC_LOCK(p1); 4667ebccf1e3SJoseph Koshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 4668ebccf1e3SJoseph Koshy PROC_UNLOCK(p1); 4669ebccf1e3SJoseph Koshy 4670f263522aSJoseph Koshy /* 4671f263522aSJoseph Koshy * If there are system-wide sampling PMCs active, we need to 4672f263522aSJoseph Koshy * log all fork events to their owner's logs. 4673f263522aSJoseph Koshy */ 4674*0f00315cSMatt Macy epoch_enter(global_epoch); 4675*0f00315cSMatt Macy CK_LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 4676f263522aSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 4677f263522aSJoseph Koshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 4678*0f00315cSMatt Macy epoch_exit(global_epoch); 4679f263522aSJoseph Koshy 4680f263522aSJoseph Koshy if (!is_using_hwpmcs) 4681f263522aSJoseph Koshy return; 4682f263522aSJoseph Koshy 4683ebccf1e3SJoseph Koshy PMC_GET_SX_XLOCK(); 46844a3690dfSJohn Baldwin PMCDBG4(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 4685f263522aSJoseph Koshy p1->p_pid, p1->p_comm, newproc); 4686f263522aSJoseph Koshy 4687f263522aSJoseph Koshy /* 4688f263522aSJoseph Koshy * If the parent process (curthread->td_proc) is a 4689f263522aSJoseph Koshy * target of any PMCs, look for PMCs that are to be 4690f263522aSJoseph Koshy * inherited, and link these into the new process 4691f263522aSJoseph Koshy * descriptor. 4692f263522aSJoseph Koshy */ 4693f263522aSJoseph Koshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 4694f263522aSJoseph Koshy PMC_FLAG_NONE)) == NULL) 4695f263522aSJoseph Koshy goto done; /* nothing to do */ 4696f263522aSJoseph Koshy 4697f263522aSJoseph Koshy do_descendants = 0; 4698f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 4699f263522aSJoseph Koshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 4700f263522aSJoseph Koshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 4701f263522aSJoseph Koshy if (do_descendants == 0) /* nothing to do */ 4702f263522aSJoseph Koshy goto done; 4703f263522aSJoseph Koshy 4704f263522aSJoseph Koshy /* allocate a descriptor for the new process */ 4705f263522aSJoseph Koshy if ((ppnew = pmc_find_process_descriptor(newproc, 4706f263522aSJoseph Koshy PMC_FLAG_ALLOCATE)) == NULL) 4707f263522aSJoseph Koshy goto done; 4708f263522aSJoseph Koshy 4709f263522aSJoseph Koshy /* 4710f263522aSJoseph Koshy * Run through all PMCs that were targeting the old process 4711f263522aSJoseph Koshy * and which specified F_DESCENDANTS and attach them to the 4712f263522aSJoseph Koshy * new process. 4713f263522aSJoseph Koshy * 4714f263522aSJoseph Koshy * Log the fork event to all owners of PMCs attached to this 4715f263522aSJoseph Koshy * process, if not already logged. 4716f263522aSJoseph Koshy */ 4717f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 4718f263522aSJoseph Koshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 4719f263522aSJoseph Koshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 4720f263522aSJoseph Koshy pmc_link_target_process(pm, ppnew); 4721f263522aSJoseph Koshy po = pm->pm_owner; 4722f263522aSJoseph Koshy if (po->po_sscount == 0 && 4723f263522aSJoseph Koshy po->po_flags & PMC_PO_OWNS_LOGFILE) 4724f263522aSJoseph Koshy pmclog_process_procfork(po, p1->p_pid, 4725f263522aSJoseph Koshy newproc->p_pid); 4726ebccf1e3SJoseph Koshy } 4727f263522aSJoseph Koshy 4728f263522aSJoseph Koshy /* 4729f263522aSJoseph Koshy * Now mark the new process as being tracked by this driver. 4730f263522aSJoseph Koshy */ 4731f263522aSJoseph Koshy PROC_LOCK(newproc); 4732f263522aSJoseph Koshy newproc->p_flag |= P_HWPMC; 4733f263522aSJoseph Koshy PROC_UNLOCK(newproc); 4734f263522aSJoseph Koshy 4735f263522aSJoseph Koshy done: 4736f263522aSJoseph Koshy sx_xunlock(&pmc_sx); 4737ebccf1e3SJoseph Koshy } 4738ebccf1e3SJoseph Koshy 473929f4e216SMark Johnston static void 474029f4e216SMark Johnston pmc_kld_load(void *arg __unused, linker_file_t lf) 474129f4e216SMark Johnston { 474229f4e216SMark Johnston struct pmc_owner *po; 474329f4e216SMark Johnston 474429f4e216SMark Johnston /* 474529f4e216SMark Johnston * Notify owners of system sampling PMCs about KLD operations. 474629f4e216SMark Johnston */ 4747*0f00315cSMatt Macy epoch_enter(global_epoch); 4748*0f00315cSMatt Macy CK_LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 474929f4e216SMark Johnston if (po->po_flags & PMC_PO_OWNS_LOGFILE) 475029f4e216SMark Johnston pmclog_process_map_in(po, (pid_t) -1, 475129f4e216SMark Johnston (uintfptr_t) lf->address, lf->filename); 4752*0f00315cSMatt Macy epoch_exit(global_epoch); 475329f4e216SMark Johnston 475429f4e216SMark Johnston /* 475529f4e216SMark Johnston * TODO: Notify owners of (all) process-sampling PMCs too. 475629f4e216SMark Johnston */ 475729f4e216SMark Johnston } 475829f4e216SMark Johnston 475929f4e216SMark Johnston static void 476029f4e216SMark Johnston pmc_kld_unload(void *arg __unused, const char *filename __unused, 476129f4e216SMark Johnston caddr_t address, size_t size) 476229f4e216SMark Johnston { 476329f4e216SMark Johnston struct pmc_owner *po; 476429f4e216SMark Johnston 4765*0f00315cSMatt Macy epoch_enter(global_epoch); 4766*0f00315cSMatt Macy CK_LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 476729f4e216SMark Johnston if (po->po_flags & PMC_PO_OWNS_LOGFILE) 476829f4e216SMark Johnston pmclog_process_map_out(po, (pid_t) -1, 476929f4e216SMark Johnston (uintfptr_t) address, (uintfptr_t) address + size); 4770*0f00315cSMatt Macy epoch_exit(global_epoch); 477129f4e216SMark Johnston 477229f4e216SMark Johnston /* 477329f4e216SMark Johnston * TODO: Notify owners of process-sampling PMCs. 477429f4e216SMark Johnston */ 477529f4e216SMark Johnston } 4776ebccf1e3SJoseph Koshy 4777ebccf1e3SJoseph Koshy /* 4778ebccf1e3SJoseph Koshy * initialization 4779ebccf1e3SJoseph Koshy */ 47800ceb54c2SJohn Baldwin static const char * 47810ceb54c2SJohn Baldwin pmc_name_of_pmcclass(enum pmc_class class) 47820ceb54c2SJohn Baldwin { 4783ebccf1e3SJoseph Koshy 47840ceb54c2SJohn Baldwin switch (class) { 4785ebccf1e3SJoseph Koshy #undef __PMC_CLASS 47860ceb54c2SJohn Baldwin #define __PMC_CLASS(S,V,D) \ 47870ceb54c2SJohn Baldwin case PMC_CLASS_##S: \ 47880ceb54c2SJohn Baldwin return #S; 47890ceb54c2SJohn Baldwin __PMC_CLASSES(); 47900ceb54c2SJohn Baldwin default: 47910ceb54c2SJohn Baldwin return ("<unknown>"); 47920ceb54c2SJohn Baldwin } 47930ceb54c2SJohn Baldwin } 4794ebccf1e3SJoseph Koshy 4795f5f9340bSFabien Thomas /* 4796f5f9340bSFabien Thomas * Base class initializer: allocate structure and set default classes. 4797f5f9340bSFabien Thomas */ 4798f5f9340bSFabien Thomas struct pmc_mdep * 4799f5f9340bSFabien Thomas pmc_mdep_alloc(int nclasses) 4800f5f9340bSFabien Thomas { 4801f5f9340bSFabien Thomas struct pmc_mdep *md; 4802f5f9340bSFabien Thomas int n; 4803f5f9340bSFabien Thomas 4804f5f9340bSFabien Thomas /* SOFT + md classes */ 4805f5f9340bSFabien Thomas n = 1 + nclasses; 4806f5f9340bSFabien Thomas md = malloc(sizeof(struct pmc_mdep) + n * 4807f5f9340bSFabien Thomas sizeof(struct pmc_classdep), M_PMC, M_WAITOK|M_ZERO); 4808f5f9340bSFabien Thomas md->pmd_nclass = n; 4809f5f9340bSFabien Thomas 4810f5f9340bSFabien Thomas /* Add base class. */ 4811f5f9340bSFabien Thomas pmc_soft_initialize(md); 4812f5f9340bSFabien Thomas return md; 4813f5f9340bSFabien Thomas } 4814f5f9340bSFabien Thomas 4815f5f9340bSFabien Thomas void 4816f5f9340bSFabien Thomas pmc_mdep_free(struct pmc_mdep *md) 4817f5f9340bSFabien Thomas { 4818f5f9340bSFabien Thomas pmc_soft_finalize(md); 4819f5f9340bSFabien Thomas free(md, M_PMC); 4820f5f9340bSFabien Thomas } 4821f5f9340bSFabien Thomas 4822f5f9340bSFabien Thomas static int 4823f5f9340bSFabien Thomas generic_switch_in(struct pmc_cpu *pc, struct pmc_process *pp) 4824f5f9340bSFabien Thomas { 4825f5f9340bSFabien Thomas (void) pc; (void) pp; 4826f5f9340bSFabien Thomas 4827f5f9340bSFabien Thomas return (0); 4828f5f9340bSFabien Thomas } 4829f5f9340bSFabien Thomas 4830f5f9340bSFabien Thomas static int 4831f5f9340bSFabien Thomas generic_switch_out(struct pmc_cpu *pc, struct pmc_process *pp) 4832f5f9340bSFabien Thomas { 4833f5f9340bSFabien Thomas (void) pc; (void) pp; 4834f5f9340bSFabien Thomas 4835f5f9340bSFabien Thomas return (0); 4836f5f9340bSFabien Thomas } 4837f5f9340bSFabien Thomas 4838f5f9340bSFabien Thomas static struct pmc_mdep * 4839f5f9340bSFabien Thomas pmc_generic_cpu_initialize(void) 4840f5f9340bSFabien Thomas { 4841f5f9340bSFabien Thomas struct pmc_mdep *md; 4842f5f9340bSFabien Thomas 4843f5f9340bSFabien Thomas md = pmc_mdep_alloc(0); 4844f5f9340bSFabien Thomas 4845f5f9340bSFabien Thomas md->pmd_cputype = PMC_CPU_GENERIC; 4846f5f9340bSFabien Thomas 4847f5f9340bSFabien Thomas md->pmd_pcpu_init = NULL; 4848f5f9340bSFabien Thomas md->pmd_pcpu_fini = NULL; 4849f5f9340bSFabien Thomas md->pmd_switch_in = generic_switch_in; 4850f5f9340bSFabien Thomas md->pmd_switch_out = generic_switch_out; 4851f5f9340bSFabien Thomas 4852f5f9340bSFabien Thomas return (md); 4853f5f9340bSFabien Thomas } 4854f5f9340bSFabien Thomas 4855f5f9340bSFabien Thomas static void 4856f5f9340bSFabien Thomas pmc_generic_cpu_finalize(struct pmc_mdep *md) 4857f5f9340bSFabien Thomas { 4858f5f9340bSFabien Thomas (void) md; 4859f5f9340bSFabien Thomas } 4860f5f9340bSFabien Thomas 4861f5f9340bSFabien Thomas 4862ebccf1e3SJoseph Koshy static int 4863ebccf1e3SJoseph Koshy pmc_initialize(void) 4864ebccf1e3SJoseph Koshy { 4865e829eb6dSJoseph Koshy int c, cpu, error, n, ri; 4866e6b475e0SMatt Macy unsigned int maxcpu, domain; 4867e6b475e0SMatt Macy struct pcpu *pc; 4868ebccf1e3SJoseph Koshy struct pmc_binding pb; 4869d07f36b0SJoseph Koshy struct pmc_sample *ps; 4870e829eb6dSJoseph Koshy struct pmc_classdep *pcd; 4871f263522aSJoseph Koshy struct pmc_samplebuffer *sb; 4872ebccf1e3SJoseph Koshy 4873ebccf1e3SJoseph Koshy md = NULL; 4874ebccf1e3SJoseph Koshy error = 0; 4875ebccf1e3SJoseph Koshy 4876e6b475e0SMatt Macy pmc_stats.pm_intr_ignored = counter_u64_alloc(M_WAITOK); 4877e6b475e0SMatt Macy pmc_stats.pm_intr_processed = counter_u64_alloc(M_WAITOK); 4878e6b475e0SMatt Macy pmc_stats.pm_intr_bufferfull = counter_u64_alloc(M_WAITOK); 4879e6b475e0SMatt Macy pmc_stats.pm_syscalls = counter_u64_alloc(M_WAITOK); 4880e6b475e0SMatt Macy pmc_stats.pm_syscall_errors = counter_u64_alloc(M_WAITOK); 4881e6b475e0SMatt Macy pmc_stats.pm_buffer_requests = counter_u64_alloc(M_WAITOK); 4882e6b475e0SMatt Macy pmc_stats.pm_buffer_requests_failed = counter_u64_alloc(M_WAITOK); 4883e6b475e0SMatt Macy pmc_stats.pm_log_sweeps = counter_u64_alloc(M_WAITOK); 4884e6b475e0SMatt Macy 4885680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 4886ebccf1e3SJoseph Koshy /* parse debug flags first */ 4887ebccf1e3SJoseph Koshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 4888ebccf1e3SJoseph Koshy pmc_debugstr, sizeof(pmc_debugstr))) 4889ebccf1e3SJoseph Koshy pmc_debugflags_parse(pmc_debugstr, 4890ebccf1e3SJoseph Koshy pmc_debugstr+strlen(pmc_debugstr)); 4891ebccf1e3SJoseph Koshy #endif 4892ebccf1e3SJoseph Koshy 48934a3690dfSJohn Baldwin PMCDBG1(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 4894ebccf1e3SJoseph Koshy 4895fadcc6e2SJoseph Koshy /* check kernel version */ 4896fadcc6e2SJoseph Koshy if (pmc_kernel_version != PMC_VERSION) { 4897fadcc6e2SJoseph Koshy if (pmc_kernel_version == 0) 4898fadcc6e2SJoseph Koshy printf("hwpmc: this kernel has not been compiled with " 4899fadcc6e2SJoseph Koshy "'options HWPMC_HOOKS'.\n"); 4900fadcc6e2SJoseph Koshy else 4901fadcc6e2SJoseph Koshy printf("hwpmc: kernel version (0x%x) does not match " 4902fadcc6e2SJoseph Koshy "module version (0x%x).\n", pmc_kernel_version, 4903fadcc6e2SJoseph Koshy PMC_VERSION); 4904fadcc6e2SJoseph Koshy return EPROGMISMATCH; 4905fadcc6e2SJoseph Koshy } 4906fadcc6e2SJoseph Koshy 4907ebccf1e3SJoseph Koshy /* 4908ebccf1e3SJoseph Koshy * check sysctl parameters 4909ebccf1e3SJoseph Koshy */ 4910ebccf1e3SJoseph Koshy 4911ebccf1e3SJoseph Koshy if (pmc_hashsize <= 0) { 4912d07f36b0SJoseph Koshy (void) printf("hwpmc: tunable \"hashsize\"=%d must be " 4913d07f36b0SJoseph Koshy "greater than zero.\n", pmc_hashsize); 4914ebccf1e3SJoseph Koshy pmc_hashsize = PMC_HASH_SIZE; 4915ebccf1e3SJoseph Koshy } 4916ebccf1e3SJoseph Koshy 4917f263522aSJoseph Koshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 4918d07f36b0SJoseph Koshy (void) printf("hwpmc: tunable \"nsamples\"=%d out of " 4919d07f36b0SJoseph Koshy "range.\n", pmc_nsamples); 4920f263522aSJoseph Koshy pmc_nsamples = PMC_NSAMPLES; 4921f263522aSJoseph Koshy } 4922f263522aSJoseph Koshy 4923d07f36b0SJoseph Koshy if (pmc_callchaindepth <= 0 || 4924d07f36b0SJoseph Koshy pmc_callchaindepth > PMC_CALLCHAIN_DEPTH_MAX) { 4925d07f36b0SJoseph Koshy (void) printf("hwpmc: tunable \"callchaindepth\"=%d out of " 4926201b654eSEd Maste "range - using %d.\n", pmc_callchaindepth, 4927201b654eSEd Maste PMC_CALLCHAIN_DEPTH_MAX); 4928201b654eSEd Maste pmc_callchaindepth = PMC_CALLCHAIN_DEPTH_MAX; 4929d07f36b0SJoseph Koshy } 4930d07f36b0SJoseph Koshy 4931f263522aSJoseph Koshy md = pmc_md_initialize(); 4932f5f9340bSFabien Thomas if (md == NULL) { 4933f5f9340bSFabien Thomas /* Default to generic CPU. */ 4934f5f9340bSFabien Thomas md = pmc_generic_cpu_initialize(); 4935e829eb6dSJoseph Koshy if (md == NULL) 4936e829eb6dSJoseph Koshy return (ENOSYS); 4937f5f9340bSFabien Thomas } 4938e829eb6dSJoseph Koshy 4939e829eb6dSJoseph Koshy KASSERT(md->pmd_nclass >= 1 && md->pmd_npmc >= 1, 4940e829eb6dSJoseph Koshy ("[pmc,%d] no classes or pmcs", __LINE__)); 4941e829eb6dSJoseph Koshy 4942e829eb6dSJoseph Koshy /* Compute the map from row-indices to classdep pointers. */ 4943e829eb6dSJoseph Koshy pmc_rowindex_to_classdep = malloc(sizeof(struct pmc_classdep *) * 4944e829eb6dSJoseph Koshy md->pmd_npmc, M_PMC, M_WAITOK|M_ZERO); 4945e829eb6dSJoseph Koshy 4946e829eb6dSJoseph Koshy for (n = 0; n < md->pmd_npmc; n++) 4947e829eb6dSJoseph Koshy pmc_rowindex_to_classdep[n] = NULL; 4948e829eb6dSJoseph Koshy for (ri = c = 0; c < md->pmd_nclass; c++) { 4949e829eb6dSJoseph Koshy pcd = &md->pmd_classdep[c]; 4950e829eb6dSJoseph Koshy for (n = 0; n < pcd->pcd_num; n++, ri++) 4951e829eb6dSJoseph Koshy pmc_rowindex_to_classdep[ri] = pcd; 4952e829eb6dSJoseph Koshy } 4953e829eb6dSJoseph Koshy 4954e829eb6dSJoseph Koshy KASSERT(ri == md->pmd_npmc, 4955e829eb6dSJoseph Koshy ("[pmc,%d] npmc miscomputed: ri=%d, md->npmc=%d", __LINE__, 4956e829eb6dSJoseph Koshy ri, md->pmd_npmc)); 4957ebccf1e3SJoseph Koshy 4958122ccdc1SJoseph Koshy maxcpu = pmc_cpu_max(); 4959122ccdc1SJoseph Koshy 4960ebccf1e3SJoseph Koshy /* allocate space for the per-cpu array */ 4961e829eb6dSJoseph Koshy pmc_pcpu = malloc(maxcpu * sizeof(struct pmc_cpu *), M_PMC, 4962e829eb6dSJoseph Koshy M_WAITOK|M_ZERO); 4963ebccf1e3SJoseph Koshy 4964ebccf1e3SJoseph Koshy /* per-cpu 'saved values' for managing process-mode PMCs */ 4965e11e3f18SDag-Erling Smørgrav pmc_pcpu_saved = malloc(sizeof(pmc_value_t) * maxcpu * md->pmd_npmc, 4966e11e3f18SDag-Erling Smørgrav M_PMC, M_WAITOK); 4967ebccf1e3SJoseph Koshy 4968122ccdc1SJoseph Koshy /* Perform CPU-dependent initialization. */ 4969ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 4970e829eb6dSJoseph Koshy error = 0; 4971e829eb6dSJoseph Koshy for (cpu = 0; error == 0 && cpu < maxcpu; cpu++) { 4972122ccdc1SJoseph Koshy if (!pmc_cpu_is_active(cpu)) 4973ebccf1e3SJoseph Koshy continue; 4974ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 4975e829eb6dSJoseph Koshy pmc_pcpu[cpu] = malloc(sizeof(struct pmc_cpu) + 4976e829eb6dSJoseph Koshy md->pmd_npmc * sizeof(struct pmc_hw *), M_PMC, 4977e829eb6dSJoseph Koshy M_WAITOK|M_ZERO); 4978e829eb6dSJoseph Koshy if (md->pmd_pcpu_init) 49790cfab8ddSJoseph Koshy error = md->pmd_pcpu_init(md, cpu); 4980e829eb6dSJoseph Koshy for (n = 0; error == 0 && n < md->pmd_nclass; n++) 4981e829eb6dSJoseph Koshy error = md->pmd_classdep[n].pcd_pcpu_init(md, cpu); 4982ebccf1e3SJoseph Koshy } 4983ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 4984ebccf1e3SJoseph Koshy 4985e829eb6dSJoseph Koshy if (error) 4986e829eb6dSJoseph Koshy return (error); 4987ebccf1e3SJoseph Koshy 4988f263522aSJoseph Koshy /* allocate space for the sample array */ 4989122ccdc1SJoseph Koshy for (cpu = 0; cpu < maxcpu; cpu++) { 4990122ccdc1SJoseph Koshy if (!pmc_cpu_is_active(cpu)) 4991f263522aSJoseph Koshy continue; 4992e6b475e0SMatt Macy pc = pcpu_find(cpu); 4993e6b475e0SMatt Macy domain = pc->pc_domain; 4994e6b475e0SMatt Macy sb = malloc_domain(sizeof(struct pmc_samplebuffer) + 4995e6b475e0SMatt Macy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, domain, 4996f263522aSJoseph Koshy M_WAITOK|M_ZERO); 4997f263522aSJoseph Koshy sb->ps_read = sb->ps_write = sb->ps_samples; 4998ba8ae2deSJoseph Koshy sb->ps_fence = sb->ps_samples + pmc_nsamples; 4999e829eb6dSJoseph Koshy 5000f263522aSJoseph Koshy KASSERT(pmc_pcpu[cpu] != NULL, 5001f263522aSJoseph Koshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 5002f263522aSJoseph Koshy 5003e6b475e0SMatt Macy sb->ps_callchains = malloc_domain(pmc_callchaindepth * pmc_nsamples * 5004e6b475e0SMatt Macy sizeof(uintptr_t), M_PMC, domain, M_WAITOK|M_ZERO); 5005d07f36b0SJoseph Koshy 5006d07f36b0SJoseph Koshy for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 5007d07f36b0SJoseph Koshy ps->ps_pc = sb->ps_callchains + 5008d07f36b0SJoseph Koshy (n * pmc_callchaindepth); 5009d07f36b0SJoseph Koshy 5010f5f9340bSFabien Thomas pmc_pcpu[cpu]->pc_sb[PMC_HR] = sb; 5011f5f9340bSFabien Thomas 5012e6b475e0SMatt Macy sb = malloc_domain(sizeof(struct pmc_samplebuffer) + 5013e6b475e0SMatt Macy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, domain, 5014f5f9340bSFabien Thomas M_WAITOK|M_ZERO); 5015f5f9340bSFabien Thomas sb->ps_read = sb->ps_write = sb->ps_samples; 5016f5f9340bSFabien Thomas sb->ps_fence = sb->ps_samples + pmc_nsamples; 5017f5f9340bSFabien Thomas 5018f5f9340bSFabien Thomas KASSERT(pmc_pcpu[cpu] != NULL, 5019f5f9340bSFabien Thomas ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 5020f5f9340bSFabien Thomas 5021e6b475e0SMatt Macy sb->ps_callchains = malloc_domain(pmc_callchaindepth * pmc_nsamples * 5022e6b475e0SMatt Macy sizeof(uintptr_t), M_PMC, domain, M_WAITOK|M_ZERO); 5023f5f9340bSFabien Thomas 5024f5f9340bSFabien Thomas for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++) 5025f5f9340bSFabien Thomas ps->ps_pc = sb->ps_callchains + 5026f5f9340bSFabien Thomas (n * pmc_callchaindepth); 5027f5f9340bSFabien Thomas 5028f5f9340bSFabien Thomas pmc_pcpu[cpu]->pc_sb[PMC_SR] = sb; 5029f263522aSJoseph Koshy } 5030f263522aSJoseph Koshy 5031ebccf1e3SJoseph Koshy /* allocate space for the row disposition array */ 5032ebccf1e3SJoseph Koshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 5033ebccf1e3SJoseph Koshy M_PMC, M_WAITOK|M_ZERO); 5034ebccf1e3SJoseph Koshy 5035ebccf1e3SJoseph Koshy /* mark all PMCs as available */ 5036ebccf1e3SJoseph Koshy for (n = 0; n < (int) md->pmd_npmc; n++) 5037ebccf1e3SJoseph Koshy PMC_MARK_ROW_FREE(n); 5038ebccf1e3SJoseph Koshy 5039ebccf1e3SJoseph Koshy /* allocate thread hash tables */ 5040ebccf1e3SJoseph Koshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 5041ebccf1e3SJoseph Koshy &pmc_ownerhashmask); 5042ebccf1e3SJoseph Koshy 5043ebccf1e3SJoseph Koshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 5044ebccf1e3SJoseph Koshy &pmc_processhashmask); 5045382d30cdSJoseph Koshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc-leaf", 5046382d30cdSJoseph Koshy MTX_SPIN); 5047ebccf1e3SJoseph Koshy 5048f263522aSJoseph Koshy LIST_INIT(&pmc_ss_owners); 5049f263522aSJoseph Koshy pmc_ss_count = 0; 5050f263522aSJoseph Koshy 5051ebccf1e3SJoseph Koshy /* allocate a pool of spin mutexes */ 5052382d30cdSJoseph Koshy pmc_mtxpool = mtx_pool_create("pmc-leaf", pmc_mtxpool_size, 5053382d30cdSJoseph Koshy MTX_SPIN); 5054ebccf1e3SJoseph Koshy 50554a3690dfSJohn Baldwin PMCDBG4(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 5056ebccf1e3SJoseph Koshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 5057ebccf1e3SJoseph Koshy pmc_processhash, pmc_processhashmask); 5058ebccf1e3SJoseph Koshy 5059ebccf1e3SJoseph Koshy /* register process {exit,fork,exec} handlers */ 5060ebccf1e3SJoseph Koshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 5061ebccf1e3SJoseph Koshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 5062ebccf1e3SJoseph Koshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 5063ebccf1e3SJoseph Koshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 5064ebccf1e3SJoseph Koshy 506529f4e216SMark Johnston /* register kld event handlers */ 506629f4e216SMark Johnston pmc_kld_load_tag = EVENTHANDLER_REGISTER(kld_load, pmc_kld_load, 506729f4e216SMark Johnston NULL, EVENTHANDLER_PRI_ANY); 506829f4e216SMark Johnston pmc_kld_unload_tag = EVENTHANDLER_REGISTER(kld_unload, pmc_kld_unload, 506929f4e216SMark Johnston NULL, EVENTHANDLER_PRI_ANY); 507029f4e216SMark Johnston 5071f263522aSJoseph Koshy /* initialize logging */ 5072f263522aSJoseph Koshy pmclog_initialize(); 5073f263522aSJoseph Koshy 5074ebccf1e3SJoseph Koshy /* set hook functions */ 5075ebccf1e3SJoseph Koshy pmc_intr = md->pmd_intr; 5076*0f00315cSMatt Macy wmb(); 5077ebccf1e3SJoseph Koshy pmc_hook = pmc_hook_handler; 5078ebccf1e3SJoseph Koshy 5079ebccf1e3SJoseph Koshy if (error == 0) { 5080ebccf1e3SJoseph Koshy printf(PMC_MODULE_NAME ":"); 5081a8eb16c5SJoseph Koshy for (n = 0; n < (int) md->pmd_nclass; n++) { 5082e829eb6dSJoseph Koshy pcd = &md->pmd_classdep[n]; 50837dada264SJoseph Koshy printf(" %s/%d/%d/0x%b", 50840ceb54c2SJohn Baldwin pmc_name_of_pmcclass(pcd->pcd_class), 5085e829eb6dSJoseph Koshy pcd->pcd_num, 50867dada264SJoseph Koshy pcd->pcd_width, 5087e829eb6dSJoseph Koshy pcd->pcd_caps, 5088a8eb16c5SJoseph Koshy "\20" 5089a8eb16c5SJoseph Koshy "\1INT\2USR\3SYS\4EDG\5THR" 5090a8eb16c5SJoseph Koshy "\6REA\7WRI\10INV\11QUA\12PRC" 5091a8eb16c5SJoseph Koshy "\13TAG\14CSC"); 5092a8eb16c5SJoseph Koshy } 5093ebccf1e3SJoseph Koshy printf("\n"); 5094ebccf1e3SJoseph Koshy } 5095ebccf1e3SJoseph Koshy 5096e829eb6dSJoseph Koshy return (error); 5097ebccf1e3SJoseph Koshy } 5098ebccf1e3SJoseph Koshy 5099ebccf1e3SJoseph Koshy /* prepare to be unloaded */ 5100ebccf1e3SJoseph Koshy static void 5101ebccf1e3SJoseph Koshy pmc_cleanup(void) 5102ebccf1e3SJoseph Koshy { 5103e829eb6dSJoseph Koshy int c, cpu; 5104122ccdc1SJoseph Koshy unsigned int maxcpu; 5105ebccf1e3SJoseph Koshy struct pmc_ownerhash *ph; 5106ebccf1e3SJoseph Koshy struct pmc_owner *po, *tmp; 5107ebccf1e3SJoseph Koshy struct pmc_binding pb; 5108680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 5109ebccf1e3SJoseph Koshy struct pmc_processhash *prh; 5110ebccf1e3SJoseph Koshy #endif 5111ebccf1e3SJoseph Koshy 51124a3690dfSJohn Baldwin PMCDBG0(MOD,INI,0, "cleanup"); 5113ebccf1e3SJoseph Koshy 5114f263522aSJoseph Koshy /* switch off sampling */ 5115e6b475e0SMatt Macy CPU_FOREACH(cpu) 5116e6b475e0SMatt Macy DPCPU_ID_SET(cpu, pmc_sampled, 0); 5117f263522aSJoseph Koshy pmc_intr = NULL; 5118ebccf1e3SJoseph Koshy 5119ebccf1e3SJoseph Koshy sx_xlock(&pmc_sx); 5120ebccf1e3SJoseph Koshy if (pmc_hook == NULL) { /* being unloaded already */ 5121ebccf1e3SJoseph Koshy sx_xunlock(&pmc_sx); 5122ebccf1e3SJoseph Koshy return; 5123ebccf1e3SJoseph Koshy } 5124ebccf1e3SJoseph Koshy 5125ebccf1e3SJoseph Koshy pmc_hook = NULL; /* prevent new threads from entering module */ 5126ebccf1e3SJoseph Koshy 5127ebccf1e3SJoseph Koshy /* deregister event handlers */ 5128ebccf1e3SJoseph Koshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 5129ebccf1e3SJoseph Koshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 513029f4e216SMark Johnston EVENTHANDLER_DEREGISTER(kld_load, pmc_kld_load_tag); 513129f4e216SMark Johnston EVENTHANDLER_DEREGISTER(kld_unload, pmc_kld_unload_tag); 5132ebccf1e3SJoseph Koshy 5133ebccf1e3SJoseph Koshy /* send SIGBUS to all owner threads, free up allocations */ 5134ebccf1e3SJoseph Koshy if (pmc_ownerhash) 5135ebccf1e3SJoseph Koshy for (ph = pmc_ownerhash; 5136ebccf1e3SJoseph Koshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 5137ebccf1e3SJoseph Koshy ph++) { 5138ebccf1e3SJoseph Koshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 5139ebccf1e3SJoseph Koshy pmc_remove_owner(po); 5140ebccf1e3SJoseph Koshy 5141ebccf1e3SJoseph Koshy /* send SIGBUS to owner processes */ 51424a3690dfSJohn Baldwin PMCDBG3(MOD,INI,2, "cleanup signal proc=%p " 5143ebccf1e3SJoseph Koshy "(%d, %s)", po->po_owner, 5144ebccf1e3SJoseph Koshy po->po_owner->p_pid, 5145ebccf1e3SJoseph Koshy po->po_owner->p_comm); 5146ebccf1e3SJoseph Koshy 5147ebccf1e3SJoseph Koshy PROC_LOCK(po->po_owner); 51488451d0ddSKip Macy kern_psignal(po->po_owner, SIGBUS); 5149ebccf1e3SJoseph Koshy PROC_UNLOCK(po->po_owner); 5150f263522aSJoseph Koshy 5151f263522aSJoseph Koshy pmc_destroy_owner_descriptor(po); 5152ebccf1e3SJoseph Koshy } 5153ebccf1e3SJoseph Koshy } 5154ebccf1e3SJoseph Koshy 5155ebccf1e3SJoseph Koshy /* reclaim allocated data structures */ 5156ebccf1e3SJoseph Koshy if (pmc_mtxpool) 5157ebccf1e3SJoseph Koshy mtx_pool_destroy(&pmc_mtxpool); 5158ebccf1e3SJoseph Koshy 5159ebccf1e3SJoseph Koshy mtx_destroy(&pmc_processhash_mtx); 5160ebccf1e3SJoseph Koshy if (pmc_processhash) { 5161680f1afdSJohn Baldwin #ifdef HWPMC_DEBUG 5162ebccf1e3SJoseph Koshy struct pmc_process *pp; 5163ebccf1e3SJoseph Koshy 51644a3690dfSJohn Baldwin PMCDBG0(MOD,INI,3, "destroy process hash"); 5165ebccf1e3SJoseph Koshy for (prh = pmc_processhash; 5166ebccf1e3SJoseph Koshy prh <= &pmc_processhash[pmc_processhashmask]; 5167ebccf1e3SJoseph Koshy prh++) 5168ebccf1e3SJoseph Koshy LIST_FOREACH(pp, prh, pp_next) 51694a3690dfSJohn Baldwin PMCDBG1(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 5170ebccf1e3SJoseph Koshy #endif 5171ebccf1e3SJoseph Koshy 5172ebccf1e3SJoseph Koshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 5173ebccf1e3SJoseph Koshy pmc_processhash = NULL; 5174ebccf1e3SJoseph Koshy } 5175ebccf1e3SJoseph Koshy 5176ebccf1e3SJoseph Koshy if (pmc_ownerhash) { 51774a3690dfSJohn Baldwin PMCDBG0(MOD,INI,3, "destroy owner hash"); 5178ebccf1e3SJoseph Koshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 5179ebccf1e3SJoseph Koshy pmc_ownerhash = NULL; 5180ebccf1e3SJoseph Koshy } 5181ebccf1e3SJoseph Koshy 5182f263522aSJoseph Koshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 5183f263522aSJoseph Koshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 5184f263522aSJoseph Koshy KASSERT(pmc_ss_count == 0, 5185f263522aSJoseph Koshy ("[pmc,%d] Global SS count not empty", __LINE__)); 5186f263522aSJoseph Koshy 5187e829eb6dSJoseph Koshy /* do processor and pmc-class dependent cleanup */ 5188122ccdc1SJoseph Koshy maxcpu = pmc_cpu_max(); 5189ba8ae2deSJoseph Koshy 51904a3690dfSJohn Baldwin PMCDBG0(MOD,INI,3, "md cleanup"); 5191ebccf1e3SJoseph Koshy if (md) { 5192ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 5193122ccdc1SJoseph Koshy for (cpu = 0; cpu < maxcpu; cpu++) { 51944a3690dfSJohn Baldwin PMCDBG2(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 5195ebccf1e3SJoseph Koshy cpu, pmc_pcpu[cpu]); 5196122ccdc1SJoseph Koshy if (!pmc_cpu_is_active(cpu) || pmc_pcpu[cpu] == NULL) 5197ebccf1e3SJoseph Koshy continue; 5198ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 5199e829eb6dSJoseph Koshy for (c = 0; c < md->pmd_nclass; c++) 5200e829eb6dSJoseph Koshy md->pmd_classdep[c].pcd_pcpu_fini(md, cpu); 5201e829eb6dSJoseph Koshy if (md->pmd_pcpu_fini) 52020cfab8ddSJoseph Koshy md->pmd_pcpu_fini(md, cpu); 5203ebccf1e3SJoseph Koshy } 5204bc4f0adeSJoseph Koshy 5205f5f9340bSFabien Thomas if (md->pmd_cputype == PMC_CPU_GENERIC) 5206f5f9340bSFabien Thomas pmc_generic_cpu_finalize(md); 5207f5f9340bSFabien Thomas else 5208bc4f0adeSJoseph Koshy pmc_md_finalize(md); 5209bc4f0adeSJoseph Koshy 5210f5f9340bSFabien Thomas pmc_mdep_free(md); 5211ebccf1e3SJoseph Koshy md = NULL; 5212ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 5213ebccf1e3SJoseph Koshy } 5214ebccf1e3SJoseph Koshy 5215e829eb6dSJoseph Koshy /* Free per-cpu descriptors. */ 5216e829eb6dSJoseph Koshy for (cpu = 0; cpu < maxcpu; cpu++) { 5217e829eb6dSJoseph Koshy if (!pmc_cpu_is_active(cpu)) 5218e829eb6dSJoseph Koshy continue; 5219f5f9340bSFabien Thomas KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_HR] != NULL, 5220f5f9340bSFabien Thomas ("[pmc,%d] Null hw cpu sample buffer cpu=%d", __LINE__, 5221e829eb6dSJoseph Koshy cpu)); 5222f5f9340bSFabien Thomas KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_SR] != NULL, 5223f5f9340bSFabien Thomas ("[pmc,%d] Null sw cpu sample buffer cpu=%d", __LINE__, 5224f5f9340bSFabien Thomas cpu)); 5225e6b475e0SMatt Macy free_domain(pmc_pcpu[cpu]->pc_sb[PMC_HR]->ps_callchains, M_PMC); 5226e6b475e0SMatt Macy free_domain(pmc_pcpu[cpu]->pc_sb[PMC_HR], M_PMC); 5227e6b475e0SMatt Macy free_domain(pmc_pcpu[cpu]->pc_sb[PMC_SR]->ps_callchains, M_PMC); 5228e6b475e0SMatt Macy free_domain(pmc_pcpu[cpu]->pc_sb[PMC_SR], M_PMC); 5229e6b475e0SMatt Macy free_domain(pmc_pcpu[cpu], M_PMC); 5230e829eb6dSJoseph Koshy } 5231e829eb6dSJoseph Koshy 52321ede983cSDag-Erling Smørgrav free(pmc_pcpu, M_PMC); 5233ebccf1e3SJoseph Koshy pmc_pcpu = NULL; 5234ebccf1e3SJoseph Koshy 52351ede983cSDag-Erling Smørgrav free(pmc_pcpu_saved, M_PMC); 5236ebccf1e3SJoseph Koshy pmc_pcpu_saved = NULL; 5237ebccf1e3SJoseph Koshy 5238ebccf1e3SJoseph Koshy if (pmc_pmcdisp) { 52391ede983cSDag-Erling Smørgrav free(pmc_pmcdisp, M_PMC); 5240ebccf1e3SJoseph Koshy pmc_pmcdisp = NULL; 5241ebccf1e3SJoseph Koshy } 5242ebccf1e3SJoseph Koshy 5243e829eb6dSJoseph Koshy if (pmc_rowindex_to_classdep) { 5244e829eb6dSJoseph Koshy free(pmc_rowindex_to_classdep, M_PMC); 5245e829eb6dSJoseph Koshy pmc_rowindex_to_classdep = NULL; 5246e829eb6dSJoseph Koshy } 5247e829eb6dSJoseph Koshy 5248f263522aSJoseph Koshy pmclog_shutdown(); 5249e6b475e0SMatt Macy counter_u64_free(pmc_stats.pm_intr_ignored); 5250e6b475e0SMatt Macy counter_u64_free(pmc_stats.pm_intr_processed); 5251e6b475e0SMatt Macy counter_u64_free(pmc_stats.pm_intr_bufferfull); 5252e6b475e0SMatt Macy counter_u64_free(pmc_stats.pm_syscalls); 5253e6b475e0SMatt Macy counter_u64_free(pmc_stats.pm_syscall_errors); 5254e6b475e0SMatt Macy counter_u64_free(pmc_stats.pm_buffer_requests); 5255e6b475e0SMatt Macy counter_u64_free(pmc_stats.pm_buffer_requests_failed); 5256e6b475e0SMatt Macy counter_u64_free(pmc_stats.pm_log_sweeps); 5257ebccf1e3SJoseph Koshy sx_xunlock(&pmc_sx); /* we are done */ 5258ebccf1e3SJoseph Koshy } 5259ebccf1e3SJoseph Koshy 5260ebccf1e3SJoseph Koshy /* 5261ebccf1e3SJoseph Koshy * The function called at load/unload. 5262ebccf1e3SJoseph Koshy */ 5263ebccf1e3SJoseph Koshy 5264ebccf1e3SJoseph Koshy static int 5265ebccf1e3SJoseph Koshy load (struct module *module __unused, int cmd, void *arg __unused) 5266ebccf1e3SJoseph Koshy { 5267ebccf1e3SJoseph Koshy int error; 5268ebccf1e3SJoseph Koshy 5269ebccf1e3SJoseph Koshy error = 0; 5270ebccf1e3SJoseph Koshy 5271ebccf1e3SJoseph Koshy switch (cmd) { 5272ebccf1e3SJoseph Koshy case MOD_LOAD : 5273ebccf1e3SJoseph Koshy /* initialize the subsystem */ 5274ebccf1e3SJoseph Koshy error = pmc_initialize(); 5275ebccf1e3SJoseph Koshy if (error != 0) 5276ebccf1e3SJoseph Koshy break; 52774a3690dfSJohn Baldwin PMCDBG2(MOD,INI,1, "syscall=%d maxcpu=%d", 5278122ccdc1SJoseph Koshy pmc_syscall_num, pmc_cpu_max()); 5279ebccf1e3SJoseph Koshy break; 5280ebccf1e3SJoseph Koshy 5281ebccf1e3SJoseph Koshy 5282ebccf1e3SJoseph Koshy case MOD_UNLOAD : 5283ebccf1e3SJoseph Koshy case MOD_SHUTDOWN: 5284ebccf1e3SJoseph Koshy pmc_cleanup(); 52854a3690dfSJohn Baldwin PMCDBG0(MOD,INI,1, "unloaded"); 5286ebccf1e3SJoseph Koshy break; 5287ebccf1e3SJoseph Koshy 5288ebccf1e3SJoseph Koshy default : 5289ebccf1e3SJoseph Koshy error = EINVAL; /* XXX should panic(9) */ 5290ebccf1e3SJoseph Koshy break; 5291ebccf1e3SJoseph Koshy } 5292ebccf1e3SJoseph Koshy 5293ebccf1e3SJoseph Koshy return error; 5294ebccf1e3SJoseph Koshy } 5295