1ebccf1e3SJoseph Koshy /*- 2ebccf1e3SJoseph Koshy * Copyright (c) 2003-2005 Joseph Koshy 3ebccf1e3SJoseph Koshy * All rights reserved. 4ebccf1e3SJoseph Koshy * 5ebccf1e3SJoseph Koshy * Redistribution and use in source and binary forms, with or without 6ebccf1e3SJoseph Koshy * modification, are permitted provided that the following conditions 7ebccf1e3SJoseph Koshy * are met: 8ebccf1e3SJoseph Koshy * 1. Redistributions of source code must retain the above copyright 9ebccf1e3SJoseph Koshy * notice, this list of conditions and the following disclaimer. 10ebccf1e3SJoseph Koshy * 2. Redistributions in binary form must reproduce the above copyright 11ebccf1e3SJoseph Koshy * notice, this list of conditions and the following disclaimer in the 12ebccf1e3SJoseph Koshy * documentation and/or other materials provided with the distribution. 13ebccf1e3SJoseph Koshy * 14ebccf1e3SJoseph Koshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15ebccf1e3SJoseph Koshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16ebccf1e3SJoseph Koshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17ebccf1e3SJoseph Koshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18ebccf1e3SJoseph Koshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19ebccf1e3SJoseph Koshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20ebccf1e3SJoseph Koshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21ebccf1e3SJoseph Koshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22ebccf1e3SJoseph Koshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23ebccf1e3SJoseph Koshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24ebccf1e3SJoseph Koshy * SUCH DAMAGE. 25ebccf1e3SJoseph Koshy * 26ebccf1e3SJoseph Koshy */ 27ebccf1e3SJoseph Koshy 28ebccf1e3SJoseph Koshy #include <sys/cdefs.h> 29ebccf1e3SJoseph Koshy __FBSDID("$FreeBSD$"); 30ebccf1e3SJoseph Koshy 31ebccf1e3SJoseph Koshy #include <sys/param.h> 32ebccf1e3SJoseph Koshy #include <sys/eventhandler.h> 33ebccf1e3SJoseph Koshy #include <sys/jail.h> 34ebccf1e3SJoseph Koshy #include <sys/kernel.h> 35f263522aSJoseph Koshy #include <sys/kthread.h> 36ebccf1e3SJoseph Koshy #include <sys/limits.h> 37ebccf1e3SJoseph Koshy #include <sys/lock.h> 38ebccf1e3SJoseph Koshy #include <sys/malloc.h> 39ebccf1e3SJoseph Koshy #include <sys/module.h> 40ebccf1e3SJoseph Koshy #include <sys/mutex.h> 41ebccf1e3SJoseph Koshy #include <sys/pmc.h> 42ebccf1e3SJoseph Koshy #include <sys/pmckern.h> 43f263522aSJoseph Koshy #include <sys/pmclog.h> 44ebccf1e3SJoseph Koshy #include <sys/proc.h> 45ebccf1e3SJoseph Koshy #include <sys/queue.h> 46f263522aSJoseph Koshy #include <sys/resourcevar.h> 47ebccf1e3SJoseph Koshy #include <sys/sched.h> 48ebccf1e3SJoseph Koshy #include <sys/signalvar.h> 49ebccf1e3SJoseph Koshy #include <sys/smp.h> 50ebccf1e3SJoseph Koshy #include <sys/sx.h> 51ebccf1e3SJoseph Koshy #include <sys/sysctl.h> 52ebccf1e3SJoseph Koshy #include <sys/sysent.h> 53ebccf1e3SJoseph Koshy #include <sys/systm.h> 54f263522aSJoseph Koshy #include <sys/vnode.h> 55ebccf1e3SJoseph Koshy 56f263522aSJoseph Koshy #include <machine/atomic.h> 57ebccf1e3SJoseph Koshy #include <machine/md_var.h> 58ebccf1e3SJoseph Koshy 59ebccf1e3SJoseph Koshy /* 60ebccf1e3SJoseph Koshy * Types 61ebccf1e3SJoseph Koshy */ 62ebccf1e3SJoseph Koshy 63ebccf1e3SJoseph Koshy enum pmc_flags { 64ebccf1e3SJoseph Koshy PMC_FLAG_NONE = 0x00, /* do nothing */ 65ebccf1e3SJoseph Koshy PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */ 66ebccf1e3SJoseph Koshy PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */ 67ebccf1e3SJoseph Koshy }; 68ebccf1e3SJoseph Koshy 69ebccf1e3SJoseph Koshy /* 70ebccf1e3SJoseph Koshy * The offset in sysent where the syscall is allocated. 71ebccf1e3SJoseph Koshy */ 72ebccf1e3SJoseph Koshy 73ebccf1e3SJoseph Koshy static int pmc_syscall_num = NO_SYSCALL; 74ebccf1e3SJoseph Koshy struct pmc_cpu **pmc_pcpu; /* per-cpu state */ 75ebccf1e3SJoseph Koshy pmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */ 76ebccf1e3SJoseph Koshy 77ebccf1e3SJoseph Koshy #define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)] 78ebccf1e3SJoseph Koshy 79ebccf1e3SJoseph Koshy struct mtx_pool *pmc_mtxpool; 80ebccf1e3SJoseph Koshy static int *pmc_pmcdisp; /* PMC row dispositions */ 81ebccf1e3SJoseph Koshy 82ebccf1e3SJoseph Koshy #define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0) 83ebccf1e3SJoseph Koshy #define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0) 84ebccf1e3SJoseph Koshy #define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0) 85ebccf1e3SJoseph Koshy 86ebccf1e3SJoseph Koshy #define PMC_MARK_ROW_FREE(R) do { \ 87ebccf1e3SJoseph Koshy pmc_pmcdisp[(R)] = 0; \ 88ebccf1e3SJoseph Koshy } while (0) 89ebccf1e3SJoseph Koshy 90ebccf1e3SJoseph Koshy #define PMC_MARK_ROW_STANDALONE(R) do { \ 91ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 92ebccf1e3SJoseph Koshy __LINE__)); \ 93ebccf1e3SJoseph Koshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 94ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] >= (-mp_ncpus), ("[pmc,%d] row " \ 95ebccf1e3SJoseph Koshy "disposition error", __LINE__)); \ 96ebccf1e3SJoseph Koshy } while (0) 97ebccf1e3SJoseph Koshy 98ebccf1e3SJoseph Koshy #define PMC_UNMARK_ROW_STANDALONE(R) do { \ 99ebccf1e3SJoseph Koshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 100ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \ 101ebccf1e3SJoseph Koshy __LINE__)); \ 102ebccf1e3SJoseph Koshy } while (0) 103ebccf1e3SJoseph Koshy 104ebccf1e3SJoseph Koshy #define PMC_MARK_ROW_THREAD(R) do { \ 105ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 106ebccf1e3SJoseph Koshy __LINE__)); \ 107ebccf1e3SJoseph Koshy atomic_add_int(&pmc_pmcdisp[(R)], 1); \ 108ebccf1e3SJoseph Koshy } while (0) 109ebccf1e3SJoseph Koshy 110ebccf1e3SJoseph Koshy #define PMC_UNMARK_ROW_THREAD(R) do { \ 111ebccf1e3SJoseph Koshy atomic_add_int(&pmc_pmcdisp[(R)], -1); \ 112ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \ 113ebccf1e3SJoseph Koshy __LINE__)); \ 114ebccf1e3SJoseph Koshy } while (0) 115ebccf1e3SJoseph Koshy 116ebccf1e3SJoseph Koshy 117ebccf1e3SJoseph Koshy /* various event handlers */ 118ebccf1e3SJoseph Koshy static eventhandler_tag pmc_exit_tag, pmc_fork_tag; 119ebccf1e3SJoseph Koshy 120ebccf1e3SJoseph Koshy /* Module statistics */ 121ebccf1e3SJoseph Koshy struct pmc_op_getdriverstats pmc_stats; 122ebccf1e3SJoseph Koshy 123ebccf1e3SJoseph Koshy /* Machine/processor dependent operations */ 124ebccf1e3SJoseph Koshy struct pmc_mdep *md; 125ebccf1e3SJoseph Koshy 126ebccf1e3SJoseph Koshy /* 127ebccf1e3SJoseph Koshy * Hash tables mapping owner processes and target threads to PMCs. 128ebccf1e3SJoseph Koshy */ 129ebccf1e3SJoseph Koshy 130ebccf1e3SJoseph Koshy struct mtx pmc_processhash_mtx; /* spin mutex */ 131ebccf1e3SJoseph Koshy static u_long pmc_processhashmask; 132ebccf1e3SJoseph Koshy static LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash; 133ebccf1e3SJoseph Koshy 134ebccf1e3SJoseph Koshy /* 135ebccf1e3SJoseph Koshy * Hash table of PMC owner descriptors. This table is protected by 136ebccf1e3SJoseph Koshy * the shared PMC "sx" lock. 137ebccf1e3SJoseph Koshy */ 138ebccf1e3SJoseph Koshy 139ebccf1e3SJoseph Koshy static u_long pmc_ownerhashmask; 140ebccf1e3SJoseph Koshy static LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash; 141ebccf1e3SJoseph Koshy 142ebccf1e3SJoseph Koshy /* 143f263522aSJoseph Koshy * List of PMC owners with system-wide sampling PMCs. 144f263522aSJoseph Koshy */ 145f263522aSJoseph Koshy 146f263522aSJoseph Koshy static LIST_HEAD(, pmc_owner) pmc_ss_owners; 147f263522aSJoseph Koshy 148f263522aSJoseph Koshy 149f263522aSJoseph Koshy /* 150ebccf1e3SJoseph Koshy * Prototypes 151ebccf1e3SJoseph Koshy */ 152ebccf1e3SJoseph Koshy 153342ed5d9SRuslan Ermilov #ifdef DEBUG 154ebccf1e3SJoseph Koshy static int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS); 155ebccf1e3SJoseph Koshy static int pmc_debugflags_parse(char *newstr, char *fence); 156ebccf1e3SJoseph Koshy #endif 157ebccf1e3SJoseph Koshy 158ebccf1e3SJoseph Koshy static int load(struct module *module, int cmd, void *arg); 159f263522aSJoseph Koshy static int pmc_attach_process(struct proc *p, struct pmc *pm); 160ebccf1e3SJoseph Koshy static struct pmc *pmc_allocate_pmc_descriptor(void); 161f263522aSJoseph Koshy static struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p); 162f263522aSJoseph Koshy static int pmc_attach_one_process(struct proc *p, struct pmc *pm); 163c5153e19SJoseph Koshy static int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, 164c5153e19SJoseph Koshy int cpu); 165f263522aSJoseph Koshy static int pmc_can_attach(struct pmc *pm, struct proc *p); 166f263522aSJoseph Koshy static void pmc_cleanup(void); 167f263522aSJoseph Koshy static int pmc_detach_process(struct proc *p, struct pmc *pm); 168f263522aSJoseph Koshy static int pmc_detach_one_process(struct proc *p, struct pmc *pm, 169f263522aSJoseph Koshy int flags); 170f263522aSJoseph Koshy static void pmc_destroy_owner_descriptor(struct pmc_owner *po); 171ebccf1e3SJoseph Koshy static struct pmc_owner *pmc_find_owner_descriptor(struct proc *p); 172ebccf1e3SJoseph Koshy static int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm); 173f263522aSJoseph Koshy static struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, 174f263522aSJoseph Koshy pmc_id_t pmc); 175f263522aSJoseph Koshy static struct pmc_process *pmc_find_process_descriptor(struct proc *p, 176f263522aSJoseph Koshy uint32_t mode); 177c5153e19SJoseph Koshy static void pmc_force_context_switch(void); 178ebccf1e3SJoseph Koshy static void pmc_link_target_process(struct pmc *pm, 179ebccf1e3SJoseph Koshy struct pmc_process *pp); 180f263522aSJoseph Koshy static void pmc_maybe_remove_owner(struct pmc_owner *po); 181f263522aSJoseph Koshy static void pmc_process_csw_in(struct thread *td); 182f263522aSJoseph Koshy static void pmc_process_csw_out(struct thread *td); 183ebccf1e3SJoseph Koshy static void pmc_process_exit(void *arg, struct proc *p); 184ebccf1e3SJoseph Koshy static void pmc_process_fork(void *arg, struct proc *p1, 185ebccf1e3SJoseph Koshy struct proc *p2, int n); 186f263522aSJoseph Koshy static void pmc_process_samples(int cpu); 187f263522aSJoseph Koshy static void pmc_release_pmc_descriptor(struct pmc *pmc); 188f263522aSJoseph Koshy static void pmc_remove_owner(struct pmc_owner *po); 189f263522aSJoseph Koshy static void pmc_remove_process_descriptor(struct pmc_process *pp); 190f263522aSJoseph Koshy static void pmc_restore_cpu_binding(struct pmc_binding *pb); 191f263522aSJoseph Koshy static void pmc_save_cpu_binding(struct pmc_binding *pb); 192f263522aSJoseph Koshy static void pmc_select_cpu(int cpu); 193ebccf1e3SJoseph Koshy static int pmc_start(struct pmc *pm); 194ebccf1e3SJoseph Koshy static int pmc_stop(struct pmc *pm); 195f263522aSJoseph Koshy static int pmc_syscall_handler(struct thread *td, void *syscall_args); 196f263522aSJoseph Koshy static void pmc_unlink_target_process(struct pmc *pmc, 197f263522aSJoseph Koshy struct pmc_process *pp); 198ebccf1e3SJoseph Koshy 199ebccf1e3SJoseph Koshy /* 200ebccf1e3SJoseph Koshy * Kernel tunables and sysctl(8) interface. 201ebccf1e3SJoseph Koshy */ 202ebccf1e3SJoseph Koshy 203ebccf1e3SJoseph Koshy SYSCTL_NODE(_kern, OID_AUTO, hwpmc, CTLFLAG_RW, 0, "HWPMC parameters"); 204ebccf1e3SJoseph Koshy 205342ed5d9SRuslan Ermilov #ifdef DEBUG 206f263522aSJoseph Koshy struct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS; 207ebccf1e3SJoseph Koshy char pmc_debugstr[PMC_DEBUG_STRSIZE]; 208ebccf1e3SJoseph Koshy TUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr, 209ebccf1e3SJoseph Koshy sizeof(pmc_debugstr)); 210ebccf1e3SJoseph Koshy SYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags, 211ebccf1e3SJoseph Koshy CTLTYPE_STRING|CTLFLAG_RW|CTLFLAG_TUN, 212ebccf1e3SJoseph Koshy 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags"); 213ebccf1e3SJoseph Koshy #endif 214ebccf1e3SJoseph Koshy 215ebccf1e3SJoseph Koshy /* 216f263522aSJoseph Koshy * kern.hwpmc.hashrows -- determines the number of rows in the 217ebccf1e3SJoseph Koshy * of the hash table used to look up threads 218ebccf1e3SJoseph Koshy */ 219ebccf1e3SJoseph Koshy 220ebccf1e3SJoseph Koshy static int pmc_hashsize = PMC_HASH_SIZE; 221ebccf1e3SJoseph Koshy TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "hashsize", &pmc_hashsize); 222ebccf1e3SJoseph Koshy SYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_TUN|CTLFLAG_RD, 223ebccf1e3SJoseph Koshy &pmc_hashsize, 0, "rows in hash tables"); 224ebccf1e3SJoseph Koshy 225ebccf1e3SJoseph Koshy /* 226f263522aSJoseph Koshy * kern.hwpmc.nsamples --- number of PC samples per CPU 227ebccf1e3SJoseph Koshy */ 228ebccf1e3SJoseph Koshy 229f263522aSJoseph Koshy static int pmc_nsamples = PMC_NSAMPLES; 230f263522aSJoseph Koshy TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nsamples", &pmc_nsamples); 231f263522aSJoseph Koshy SYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_TUN|CTLFLAG_RD, 232f263522aSJoseph Koshy &pmc_nsamples, 0, "number of PC samples per CPU"); 233ebccf1e3SJoseph Koshy 234ebccf1e3SJoseph Koshy /* 235f263522aSJoseph Koshy * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool. 236ebccf1e3SJoseph Koshy */ 237ebccf1e3SJoseph Koshy 238ebccf1e3SJoseph Koshy static int pmc_mtxpool_size = PMC_MTXPOOL_SIZE; 239ebccf1e3SJoseph Koshy TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "mtxpoolsize", &pmc_mtxpool_size); 240ebccf1e3SJoseph Koshy SYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_TUN|CTLFLAG_RD, 241ebccf1e3SJoseph Koshy &pmc_mtxpool_size, 0, "size of spin mutex pool"); 242ebccf1e3SJoseph Koshy 243ebccf1e3SJoseph Koshy 244ebccf1e3SJoseph Koshy /* 245ebccf1e3SJoseph Koshy * security.bsd.unprivileged_syspmcs -- allow non-root processes to 246ebccf1e3SJoseph Koshy * allocate system-wide PMCs. 247ebccf1e3SJoseph Koshy * 248ebccf1e3SJoseph Koshy * Allowing unprivileged processes to allocate system PMCs is convenient 249ebccf1e3SJoseph Koshy * if system-wide measurements need to be taken concurrently with other 250ebccf1e3SJoseph Koshy * per-process measurements. This feature is turned off by default. 251ebccf1e3SJoseph Koshy */ 252ebccf1e3SJoseph Koshy 253ebccf1e3SJoseph Koshy SYSCTL_DECL(_security_bsd); 254ebccf1e3SJoseph Koshy 255ebccf1e3SJoseph Koshy static int pmc_unprivileged_syspmcs = 0; 256ebccf1e3SJoseph Koshy TUNABLE_INT("security.bsd.unprivileged_syspmcs", &pmc_unprivileged_syspmcs); 257ebccf1e3SJoseph Koshy SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RW, 258ebccf1e3SJoseph Koshy &pmc_unprivileged_syspmcs, 0, 259ebccf1e3SJoseph Koshy "allow unprivileged process to allocate system PMCs"); 260ebccf1e3SJoseph Koshy 261f263522aSJoseph Koshy /* 262f263522aSJoseph Koshy * Hash function. Discard the lower 2 bits of the pointer since 263f263522aSJoseph Koshy * these are always zero for our uses. The hash multiplier is 264f263522aSJoseph Koshy * round((2^LONG_BIT) * ((sqrt(5)-1)/2)). 265f263522aSJoseph Koshy */ 266ebccf1e3SJoseph Koshy 267ebccf1e3SJoseph Koshy #if LONG_BIT == 64 268ebccf1e3SJoseph Koshy #define _PMC_HM 11400714819323198486u 269ebccf1e3SJoseph Koshy #elif LONG_BIT == 32 270ebccf1e3SJoseph Koshy #define _PMC_HM 2654435769u 271ebccf1e3SJoseph Koshy #else 272ebccf1e3SJoseph Koshy #error Must know the size of 'long' to compile 273ebccf1e3SJoseph Koshy #endif 274ebccf1e3SJoseph Koshy 275ebccf1e3SJoseph Koshy #define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M)) 276ebccf1e3SJoseph Koshy 277ebccf1e3SJoseph Koshy /* 278ebccf1e3SJoseph Koshy * Syscall structures 279ebccf1e3SJoseph Koshy */ 280ebccf1e3SJoseph Koshy 281ebccf1e3SJoseph Koshy /* The `sysent' for the new syscall */ 282ebccf1e3SJoseph Koshy static struct sysent pmc_sysent = { 283ebccf1e3SJoseph Koshy 2, /* sy_narg */ 284ebccf1e3SJoseph Koshy pmc_syscall_handler /* sy_call */ 285ebccf1e3SJoseph Koshy }; 286ebccf1e3SJoseph Koshy 287ebccf1e3SJoseph Koshy static struct syscall_module_data pmc_syscall_mod = { 288ebccf1e3SJoseph Koshy load, 289ebccf1e3SJoseph Koshy NULL, 290ebccf1e3SJoseph Koshy &pmc_syscall_num, 291ebccf1e3SJoseph Koshy &pmc_sysent, 292ebccf1e3SJoseph Koshy { 0, NULL } 293ebccf1e3SJoseph Koshy }; 294ebccf1e3SJoseph Koshy 295ebccf1e3SJoseph Koshy static moduledata_t pmc_mod = { 296ebccf1e3SJoseph Koshy PMC_MODULE_NAME, 297ebccf1e3SJoseph Koshy syscall_module_handler, 298ebccf1e3SJoseph Koshy &pmc_syscall_mod 299ebccf1e3SJoseph Koshy }; 300ebccf1e3SJoseph Koshy 301ebccf1e3SJoseph Koshy DECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY); 302ebccf1e3SJoseph Koshy MODULE_VERSION(pmc, PMC_VERSION); 303ebccf1e3SJoseph Koshy 304342ed5d9SRuslan Ermilov #ifdef DEBUG 305f263522aSJoseph Koshy enum pmc_dbgparse_state { 306f263522aSJoseph Koshy PMCDS_WS, /* in whitespace */ 307f263522aSJoseph Koshy PMCDS_MAJOR, /* seen a major keyword */ 308f263522aSJoseph Koshy PMCDS_MINOR 309f263522aSJoseph Koshy }; 310f263522aSJoseph Koshy 311ebccf1e3SJoseph Koshy static int 312ebccf1e3SJoseph Koshy pmc_debugflags_parse(char *newstr, char *fence) 313ebccf1e3SJoseph Koshy { 314e1691ef7SJoseph Koshy char c, *p, *q; 315f263522aSJoseph Koshy struct pmc_debugflags *tmpflags; 316f263522aSJoseph Koshy int error, found, *newbits, tmp; 317f263522aSJoseph Koshy size_t kwlen; 318ebccf1e3SJoseph Koshy 319f263522aSJoseph Koshy MALLOC(tmpflags, struct pmc_debugflags *, sizeof(*tmpflags), 320f263522aSJoseph Koshy M_PMC, M_WAITOK|M_ZERO); 321ebccf1e3SJoseph Koshy 322ebccf1e3SJoseph Koshy p = newstr; 323f263522aSJoseph Koshy error = 0; 324ebccf1e3SJoseph Koshy 325f263522aSJoseph Koshy for (; p < fence && (c = *p); p++) { 326ebccf1e3SJoseph Koshy 327f263522aSJoseph Koshy /* skip white space */ 328f263522aSJoseph Koshy if (c == ' ' || c == '\t') 329f263522aSJoseph Koshy continue; 330f263522aSJoseph Koshy 331f263522aSJoseph Koshy /* look for a keyword followed by "=" */ 332f263522aSJoseph Koshy for (q = p; p < fence && (c = *p) && c != '='; p++) 333f263522aSJoseph Koshy ; 334f263522aSJoseph Koshy if (c != '=') { 335f263522aSJoseph Koshy error = EINVAL; 336f263522aSJoseph Koshy goto done; 337ebccf1e3SJoseph Koshy } 338ebccf1e3SJoseph Koshy 339f263522aSJoseph Koshy kwlen = p - q; 340f263522aSJoseph Koshy newbits = NULL; 341ebccf1e3SJoseph Koshy 342f263522aSJoseph Koshy /* lookup flag group name */ 343f263522aSJoseph Koshy #define DBG_SET_FLAG_MAJ(S,F) \ 344f263522aSJoseph Koshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 345f263522aSJoseph Koshy newbits = &tmpflags->pdb_ ## F; 346ebccf1e3SJoseph Koshy 347f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("cpu", CPU); 348f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("csw", CSW); 349f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("logging", LOG); 350f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("module", MOD); 351f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("md", MDP); 352f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("owner", OWN); 353f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("pmc", PMC); 354f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("process", PRC); 355f263522aSJoseph Koshy DBG_SET_FLAG_MAJ("sampling", SAM); 356ebccf1e3SJoseph Koshy 357f263522aSJoseph Koshy if (newbits == NULL) { 358f263522aSJoseph Koshy error = EINVAL; 359f263522aSJoseph Koshy goto done; 360ebccf1e3SJoseph Koshy } 361ebccf1e3SJoseph Koshy 362f263522aSJoseph Koshy p++; /* skip the '=' */ 363ebccf1e3SJoseph Koshy 364f263522aSJoseph Koshy /* Now parse the individual flags */ 365f263522aSJoseph Koshy tmp = 0; 366f263522aSJoseph Koshy newflag: 367f263522aSJoseph Koshy for (q = p; p < fence && (c = *p); p++) 368f263522aSJoseph Koshy if (c == ' ' || c == '\t' || c == ',') 369f263522aSJoseph Koshy break; 370f263522aSJoseph Koshy 371f263522aSJoseph Koshy /* p == fence or c == ws or c == "," or c == 0 */ 372f263522aSJoseph Koshy 373f263522aSJoseph Koshy if ((kwlen = p - q) == 0) { 374f263522aSJoseph Koshy *newbits = tmp; 375f263522aSJoseph Koshy continue; 376f263522aSJoseph Koshy } 377f263522aSJoseph Koshy 378f263522aSJoseph Koshy found = 0; 379f263522aSJoseph Koshy #define DBG_SET_FLAG_MIN(S,F) \ 380f263522aSJoseph Koshy if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \ 381f263522aSJoseph Koshy tmp |= found = (1 << PMC_DEBUG_MIN_ ## F) 382f263522aSJoseph Koshy 383f263522aSJoseph Koshy /* a '*' denotes all possible flags in the group */ 384f263522aSJoseph Koshy if (kwlen == 1 && *q == '*') 385f263522aSJoseph Koshy tmp = found = ~0; 386f263522aSJoseph Koshy /* look for individual flag names */ 387f263522aSJoseph Koshy DBG_SET_FLAG_MIN("allocaterow", ALR); 388f263522aSJoseph Koshy DBG_SET_FLAG_MIN("allocate", ALL); 389f263522aSJoseph Koshy DBG_SET_FLAG_MIN("attach", ATT); 390f263522aSJoseph Koshy DBG_SET_FLAG_MIN("bind", BND); 391f263522aSJoseph Koshy DBG_SET_FLAG_MIN("config", CFG); 392f263522aSJoseph Koshy DBG_SET_FLAG_MIN("exec", EXC); 393f263522aSJoseph Koshy DBG_SET_FLAG_MIN("exit", EXT); 394f263522aSJoseph Koshy DBG_SET_FLAG_MIN("find", FND); 395f263522aSJoseph Koshy DBG_SET_FLAG_MIN("flush", FLS); 396f263522aSJoseph Koshy DBG_SET_FLAG_MIN("fork", FRK); 397f263522aSJoseph Koshy DBG_SET_FLAG_MIN("getbuf", GTB); 398f263522aSJoseph Koshy DBG_SET_FLAG_MIN("hook", PMH); 399f263522aSJoseph Koshy DBG_SET_FLAG_MIN("init", INI); 400f263522aSJoseph Koshy DBG_SET_FLAG_MIN("intr", INT); 401f263522aSJoseph Koshy DBG_SET_FLAG_MIN("linktarget", TLK); 402f263522aSJoseph Koshy DBG_SET_FLAG_MIN("mayberemove", OMR); 403f263522aSJoseph Koshy DBG_SET_FLAG_MIN("ops", OPS); 404f263522aSJoseph Koshy DBG_SET_FLAG_MIN("read", REA); 405f263522aSJoseph Koshy DBG_SET_FLAG_MIN("register", REG); 406f263522aSJoseph Koshy DBG_SET_FLAG_MIN("release", REL); 407f263522aSJoseph Koshy DBG_SET_FLAG_MIN("remove", ORM); 408f263522aSJoseph Koshy DBG_SET_FLAG_MIN("sample", SAM); 409f263522aSJoseph Koshy DBG_SET_FLAG_MIN("scheduleio", SIO); 410f263522aSJoseph Koshy DBG_SET_FLAG_MIN("select", SEL); 411f263522aSJoseph Koshy DBG_SET_FLAG_MIN("signal", SIG); 412f263522aSJoseph Koshy DBG_SET_FLAG_MIN("swi", SWI); 413f263522aSJoseph Koshy DBG_SET_FLAG_MIN("swo", SWO); 414f263522aSJoseph Koshy DBG_SET_FLAG_MIN("start", STA); 415f263522aSJoseph Koshy DBG_SET_FLAG_MIN("stop", STO); 416f263522aSJoseph Koshy DBG_SET_FLAG_MIN("syscall", PMS); 417f263522aSJoseph Koshy DBG_SET_FLAG_MIN("unlinktarget", TUL); 418f263522aSJoseph Koshy DBG_SET_FLAG_MIN("write", WRI); 419f263522aSJoseph Koshy if (found == 0) { 420f263522aSJoseph Koshy /* unrecognized flag name */ 421f263522aSJoseph Koshy error = EINVAL; 422f263522aSJoseph Koshy goto done; 423f263522aSJoseph Koshy } 424f263522aSJoseph Koshy 425f263522aSJoseph Koshy if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */ 426f263522aSJoseph Koshy *newbits = tmp; 427f263522aSJoseph Koshy continue; 428f263522aSJoseph Koshy } 429f263522aSJoseph Koshy 430f263522aSJoseph Koshy p++; 431f263522aSJoseph Koshy goto newflag; 432f263522aSJoseph Koshy } 433f263522aSJoseph Koshy 434f263522aSJoseph Koshy /* save the new flag set */ 435f263522aSJoseph Koshy bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags)); 436f263522aSJoseph Koshy 437f263522aSJoseph Koshy done: 438f263522aSJoseph Koshy FREE(tmpflags, M_PMC); 439f263522aSJoseph Koshy return error; 440ebccf1e3SJoseph Koshy } 441ebccf1e3SJoseph Koshy 442ebccf1e3SJoseph Koshy static int 443ebccf1e3SJoseph Koshy pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS) 444ebccf1e3SJoseph Koshy { 445ebccf1e3SJoseph Koshy char *fence, *newstr; 446ebccf1e3SJoseph Koshy int error; 447ebccf1e3SJoseph Koshy unsigned int n; 448ebccf1e3SJoseph Koshy 449ebccf1e3SJoseph Koshy (void) arg1; (void) arg2; /* unused parameters */ 450ebccf1e3SJoseph Koshy 451ebccf1e3SJoseph Koshy n = sizeof(pmc_debugstr); 452ebccf1e3SJoseph Koshy MALLOC(newstr, char *, n, M_PMC, M_ZERO|M_WAITOK); 453f263522aSJoseph Koshy (void) strlcpy(newstr, pmc_debugstr, n); 454ebccf1e3SJoseph Koshy 455ebccf1e3SJoseph Koshy error = sysctl_handle_string(oidp, newstr, n, req); 456ebccf1e3SJoseph Koshy 457ebccf1e3SJoseph Koshy /* if there is a new string, parse and copy it */ 458ebccf1e3SJoseph Koshy if (error == 0 && req->newptr != NULL) { 459f263522aSJoseph Koshy fence = newstr + (n < req->newlen ? n : req->newlen + 1); 460ebccf1e3SJoseph Koshy if ((error = pmc_debugflags_parse(newstr, fence)) == 0) 461ebccf1e3SJoseph Koshy (void) strlcpy(pmc_debugstr, newstr, 462ebccf1e3SJoseph Koshy sizeof(pmc_debugstr)); 463ebccf1e3SJoseph Koshy } 464ebccf1e3SJoseph Koshy 465ebccf1e3SJoseph Koshy FREE(newstr, M_PMC); 466ebccf1e3SJoseph Koshy 467ebccf1e3SJoseph Koshy return error; 468ebccf1e3SJoseph Koshy } 469ebccf1e3SJoseph Koshy #endif 470ebccf1e3SJoseph Koshy 471ebccf1e3SJoseph Koshy /* 472ebccf1e3SJoseph Koshy * Concurrency Control 473ebccf1e3SJoseph Koshy * 474ebccf1e3SJoseph Koshy * The driver manages the following data structures: 475ebccf1e3SJoseph Koshy * 476ebccf1e3SJoseph Koshy * - target process descriptors, one per target process 477ebccf1e3SJoseph Koshy * - owner process descriptors (and attached lists), one per owner process 478ebccf1e3SJoseph Koshy * - lookup hash tables for owner and target processes 479ebccf1e3SJoseph Koshy * - PMC descriptors (and attached lists) 480ebccf1e3SJoseph Koshy * - per-cpu hardware state 481ebccf1e3SJoseph Koshy * - the 'hook' variable through which the kernel calls into 482ebccf1e3SJoseph Koshy * this module 483ebccf1e3SJoseph Koshy * - the machine hardware state (managed by the MD layer) 484ebccf1e3SJoseph Koshy * 485ebccf1e3SJoseph Koshy * These data structures are accessed from: 486ebccf1e3SJoseph Koshy * 487ebccf1e3SJoseph Koshy * - thread context-switch code 488ebccf1e3SJoseph Koshy * - interrupt handlers (possibly on multiple cpus) 489ebccf1e3SJoseph Koshy * - kernel threads on multiple cpus running on behalf of user 490ebccf1e3SJoseph Koshy * processes doing system calls 491ebccf1e3SJoseph Koshy * - this driver's private kernel threads 492ebccf1e3SJoseph Koshy * 493ebccf1e3SJoseph Koshy * = Locks and Locking strategy = 494ebccf1e3SJoseph Koshy * 495ebccf1e3SJoseph Koshy * The driver uses four locking strategies for its operation: 496ebccf1e3SJoseph Koshy * 497ebccf1e3SJoseph Koshy * - There is a 'global' SX lock "pmc_sx" that is used to protect 498ebccf1e3SJoseph Koshy * the its 'meta-data'. 499ebccf1e3SJoseph Koshy * 500ebccf1e3SJoseph Koshy * Calls into the module (via syscall() or by the kernel) start with 501ebccf1e3SJoseph Koshy * this lock being held in exclusive mode. Depending on the requested 502ebccf1e3SJoseph Koshy * operation, the lock may be downgraded to 'shared' mode to allow 503ebccf1e3SJoseph Koshy * more concurrent readers into the module. 504ebccf1e3SJoseph Koshy * 505ebccf1e3SJoseph Koshy * This SX lock is held in exclusive mode for any operations that 506ebccf1e3SJoseph Koshy * modify the linkages between the driver's internal data structures. 507ebccf1e3SJoseph Koshy * 508ebccf1e3SJoseph Koshy * The 'pmc_hook' function pointer is also protected by this lock. 509ebccf1e3SJoseph Koshy * It is only examined with the sx lock held in exclusive mode. The 510ebccf1e3SJoseph Koshy * kernel module is allowed to be unloaded only with the sx lock 511ebccf1e3SJoseph Koshy * held in exclusive mode. In normal syscall handling, after 512ebccf1e3SJoseph Koshy * acquiring the pmc_sx lock we first check that 'pmc_hook' is 513ebccf1e3SJoseph Koshy * non-null before proceeding. This prevents races between the 514ebccf1e3SJoseph Koshy * thread unloading the module and other threads seeking to use the 515ebccf1e3SJoseph Koshy * module. 516ebccf1e3SJoseph Koshy * 517ebccf1e3SJoseph Koshy * - Lookups of target process structures and owner process structures 518ebccf1e3SJoseph Koshy * cannot use the global "pmc_sx" SX lock because these lookups need 519ebccf1e3SJoseph Koshy * to happen during context switches and in other critical sections 520ebccf1e3SJoseph Koshy * where sleeping is not allowed. We protect these lookup tables 521ebccf1e3SJoseph Koshy * with their own private spin-mutexes, "pmc_processhash_mtx" and 522ebccf1e3SJoseph Koshy * "pmc_ownerhash_mtx". These are 'leaf' mutexes, in that no other 523ebccf1e3SJoseph Koshy * lock is acquired with these locks held. 524ebccf1e3SJoseph Koshy * 525ebccf1e3SJoseph Koshy * - Interrupt handlers work in a lock free manner. At interrupt 526ebccf1e3SJoseph Koshy * time, handlers look at the PMC pointer (phw->phw_pmc) configured 527ebccf1e3SJoseph Koshy * when the PMC was started. If this pointer is NULL, the interrupt 528ebccf1e3SJoseph Koshy * is ignored after updating driver statistics. We ensure that this 529ebccf1e3SJoseph Koshy * pointer is set (using an atomic operation if necessary) before the 530ebccf1e3SJoseph Koshy * PMC hardware is started. Conversely, this pointer is unset atomically 531ebccf1e3SJoseph Koshy * only after the PMC hardware is stopped. 532ebccf1e3SJoseph Koshy * 533ebccf1e3SJoseph Koshy * We ensure that everything needed for the operation of an 534ebccf1e3SJoseph Koshy * interrupt handler is available without it needing to acquire any 535ebccf1e3SJoseph Koshy * locks. We also ensure that a PMC's software state is destroyed only 536ebccf1e3SJoseph Koshy * after the PMC is taken off hardware (on all CPUs). 537ebccf1e3SJoseph Koshy * 538ebccf1e3SJoseph Koshy * - Context-switch handling with process-private PMCs needs more 539ebccf1e3SJoseph Koshy * care. 540ebccf1e3SJoseph Koshy * 541ebccf1e3SJoseph Koshy * A given process may be the target of multiple PMCs. For example, 542ebccf1e3SJoseph Koshy * PMCATTACH and PMCDETACH may be requested by a process on one CPU 543ebccf1e3SJoseph Koshy * while the target process is running on another. A PMC could also 544ebccf1e3SJoseph Koshy * be getting released because its owner is exiting. We tackle 545ebccf1e3SJoseph Koshy * these situations in the following manner: 546ebccf1e3SJoseph Koshy * 547ebccf1e3SJoseph Koshy * - each target process structure 'pmc_process' has an array 548ebccf1e3SJoseph Koshy * of 'struct pmc *' pointers, one for each hardware PMC. 549ebccf1e3SJoseph Koshy * 550ebccf1e3SJoseph Koshy * - At context switch IN time, each "target" PMC in RUNNING state 551ebccf1e3SJoseph Koshy * gets started on hardware and a pointer to each PMC is copied into 552ebccf1e3SJoseph Koshy * the per-cpu phw array. The 'runcount' for the PMC is 553ebccf1e3SJoseph Koshy * incremented. 554ebccf1e3SJoseph Koshy * 555ebccf1e3SJoseph Koshy * - At context switch OUT time, all process-virtual PMCs are stopped 556ebccf1e3SJoseph Koshy * on hardware. The saved value is added to the PMCs value field 557ebccf1e3SJoseph Koshy * only if the PMC is in a non-deleted state (the PMCs state could 558ebccf1e3SJoseph Koshy * have changed during the current time slice). 559ebccf1e3SJoseph Koshy * 560ebccf1e3SJoseph Koshy * Note that since in-between a switch IN on a processor and a switch 561ebccf1e3SJoseph Koshy * OUT, the PMC could have been released on another CPU. Therefore 562ebccf1e3SJoseph Koshy * context switch OUT always looks at the hardware state to turn 563ebccf1e3SJoseph Koshy * OFF PMCs and will update a PMC's saved value only if reachable 564ebccf1e3SJoseph Koshy * from the target process record. 565ebccf1e3SJoseph Koshy * 566ebccf1e3SJoseph Koshy * - OP PMCRELEASE could be called on a PMC at any time (the PMC could 567ebccf1e3SJoseph Koshy * be attached to many processes at the time of the call and could 568ebccf1e3SJoseph Koshy * be active on multiple CPUs). 569ebccf1e3SJoseph Koshy * 570ebccf1e3SJoseph Koshy * We prevent further scheduling of the PMC by marking it as in 571ebccf1e3SJoseph Koshy * state 'DELETED'. If the runcount of the PMC is non-zero then 572ebccf1e3SJoseph Koshy * this PMC is currently running on a CPU somewhere. The thread 573ebccf1e3SJoseph Koshy * doing the PMCRELEASE operation waits by repeatedly doing an 574ebccf1e3SJoseph Koshy * tsleep() till the runcount comes to zero. 575ebccf1e3SJoseph Koshy * 576ebccf1e3SJoseph Koshy */ 577ebccf1e3SJoseph Koshy 578ebccf1e3SJoseph Koshy /* 579ebccf1e3SJoseph Koshy * save the cpu binding of the current kthread 580ebccf1e3SJoseph Koshy */ 581ebccf1e3SJoseph Koshy 582ebccf1e3SJoseph Koshy static void 583ebccf1e3SJoseph Koshy pmc_save_cpu_binding(struct pmc_binding *pb) 584ebccf1e3SJoseph Koshy { 585ebccf1e3SJoseph Koshy PMCDBG(CPU,BND,2, "%s", "save-cpu"); 586ebccf1e3SJoseph Koshy mtx_lock_spin(&sched_lock); 587ebccf1e3SJoseph Koshy pb->pb_bound = sched_is_bound(curthread); 588ebccf1e3SJoseph Koshy pb->pb_cpu = curthread->td_oncpu; 589ebccf1e3SJoseph Koshy mtx_unlock_spin(&sched_lock); 590ebccf1e3SJoseph Koshy PMCDBG(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu); 591ebccf1e3SJoseph Koshy } 592ebccf1e3SJoseph Koshy 593ebccf1e3SJoseph Koshy /* 594ebccf1e3SJoseph Koshy * restore the cpu binding of the current thread 595ebccf1e3SJoseph Koshy */ 596ebccf1e3SJoseph Koshy 597ebccf1e3SJoseph Koshy static void 598ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(struct pmc_binding *pb) 599ebccf1e3SJoseph Koshy { 600ebccf1e3SJoseph Koshy PMCDBG(CPU,BND,2, "restore-cpu curcpu=%d restore=%d", 601ebccf1e3SJoseph Koshy curthread->td_oncpu, pb->pb_cpu); 602ebccf1e3SJoseph Koshy mtx_lock_spin(&sched_lock); 603ebccf1e3SJoseph Koshy if (pb->pb_bound) 604ebccf1e3SJoseph Koshy sched_bind(curthread, pb->pb_cpu); 605ebccf1e3SJoseph Koshy else 606ebccf1e3SJoseph Koshy sched_unbind(curthread); 607ebccf1e3SJoseph Koshy mtx_unlock_spin(&sched_lock); 608ebccf1e3SJoseph Koshy PMCDBG(CPU,BND,2, "%s", "restore-cpu done"); 609ebccf1e3SJoseph Koshy } 610ebccf1e3SJoseph Koshy 611ebccf1e3SJoseph Koshy /* 612ebccf1e3SJoseph Koshy * move execution over the specified cpu and bind it there. 613ebccf1e3SJoseph Koshy */ 614ebccf1e3SJoseph Koshy 615ebccf1e3SJoseph Koshy static void 616ebccf1e3SJoseph Koshy pmc_select_cpu(int cpu) 617ebccf1e3SJoseph Koshy { 618ebccf1e3SJoseph Koshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 619ebccf1e3SJoseph Koshy ("[pmc,%d] bad cpu number %d", __LINE__, cpu)); 620ebccf1e3SJoseph Koshy 621ebccf1e3SJoseph Koshy /* never move to a disabled CPU */ 622ebccf1e3SJoseph Koshy KASSERT(pmc_cpu_is_disabled(cpu) == 0, ("[pmc,%d] selecting " 623ebccf1e3SJoseph Koshy "disabled CPU %d", __LINE__, cpu)); 624ebccf1e3SJoseph Koshy 625ebccf1e3SJoseph Koshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d", cpu); 626ebccf1e3SJoseph Koshy mtx_lock_spin(&sched_lock); 627ebccf1e3SJoseph Koshy sched_bind(curthread, cpu); 628ebccf1e3SJoseph Koshy mtx_unlock_spin(&sched_lock); 629ebccf1e3SJoseph Koshy 630ebccf1e3SJoseph Koshy KASSERT(curthread->td_oncpu == cpu, 631ebccf1e3SJoseph Koshy ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__, 632ebccf1e3SJoseph Koshy cpu, curthread->td_oncpu)); 633ebccf1e3SJoseph Koshy 634ebccf1e3SJoseph Koshy PMCDBG(CPU,SEL,2, "select-cpu cpu=%d ok", cpu); 635ebccf1e3SJoseph Koshy } 636ebccf1e3SJoseph Koshy 637ebccf1e3SJoseph Koshy /* 638c5153e19SJoseph Koshy * Force a context switch. 639c5153e19SJoseph Koshy * 640c5153e19SJoseph Koshy * We do this by tsleep'ing for 1 tick -- invoking mi_switch() is not 641c5153e19SJoseph Koshy * guaranteed to force a context switch. 642c5153e19SJoseph Koshy */ 643c5153e19SJoseph Koshy 644c5153e19SJoseph Koshy static void 645c5153e19SJoseph Koshy pmc_force_context_switch(void) 646c5153e19SJoseph Koshy { 647c5153e19SJoseph Koshy u_char curpri; 648c5153e19SJoseph Koshy 649c5153e19SJoseph Koshy mtx_lock_spin(&sched_lock); 650c5153e19SJoseph Koshy curpri = curthread->td_priority; 651c5153e19SJoseph Koshy mtx_unlock_spin(&sched_lock); 652c5153e19SJoseph Koshy 653c5153e19SJoseph Koshy (void) tsleep((void *) pmc_force_context_switch, curpri, 654c5153e19SJoseph Koshy "pmcctx", 1); 655c5153e19SJoseph Koshy 656c5153e19SJoseph Koshy } 657c5153e19SJoseph Koshy 658c5153e19SJoseph Koshy /* 659f263522aSJoseph Koshy * Get the file name for an executable. This is a simple wrapper 660f263522aSJoseph Koshy * around vn_fullpath(9). 661ebccf1e3SJoseph Koshy */ 662ebccf1e3SJoseph Koshy 663f263522aSJoseph Koshy static void 66415139246SJoseph Koshy pmc_getfilename(struct vnode *v, char **fullpath, char **freepath) 665ebccf1e3SJoseph Koshy { 666ebccf1e3SJoseph Koshy struct thread *td; 667ebccf1e3SJoseph Koshy 668f263522aSJoseph Koshy td = curthread; 669f263522aSJoseph Koshy *fullpath = "unknown"; 670f263522aSJoseph Koshy *freepath = NULL; 671d9dcd4f9SJoseph Koshy vn_lock(v, LK_CANRECURSE | LK_EXCLUSIVE | LK_RETRY, td); 67215139246SJoseph Koshy vn_fullpath(td, v, fullpath, freepath); 67315139246SJoseph Koshy VOP_UNLOCK(v, 0, td); 674ebccf1e3SJoseph Koshy } 675ebccf1e3SJoseph Koshy 676ebccf1e3SJoseph Koshy /* 677ebccf1e3SJoseph Koshy * remove an process owning PMCs 678ebccf1e3SJoseph Koshy */ 679ebccf1e3SJoseph Koshy 680ebccf1e3SJoseph Koshy void 681ebccf1e3SJoseph Koshy pmc_remove_owner(struct pmc_owner *po) 682ebccf1e3SJoseph Koshy { 683f263522aSJoseph Koshy struct pmc *pm, *tmp; 684ebccf1e3SJoseph Koshy 685ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 686ebccf1e3SJoseph Koshy 687ebccf1e3SJoseph Koshy PMCDBG(OWN,ORM,1, "remove-owner po=%p", po); 688ebccf1e3SJoseph Koshy 689ebccf1e3SJoseph Koshy /* Remove descriptor from the owner hash table */ 690ebccf1e3SJoseph Koshy LIST_REMOVE(po, po_next); 691ebccf1e3SJoseph Koshy 692f263522aSJoseph Koshy /* release all owned PMC descriptors */ 693f263522aSJoseph Koshy LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) { 694f263522aSJoseph Koshy PMCDBG(OWN,ORM,2, "pmc=%p", pm); 695f263522aSJoseph Koshy KASSERT(pm->pm_owner == po, 696f263522aSJoseph Koshy ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po)); 697ebccf1e3SJoseph Koshy 698f263522aSJoseph Koshy pmc_release_pmc_descriptor(pm); /* will unlink from the list */ 699ebccf1e3SJoseph Koshy } 700ebccf1e3SJoseph Koshy 701f263522aSJoseph Koshy KASSERT(po->po_sscount == 0, 702f263522aSJoseph Koshy ("[pmc,%d] SS count not zero", __LINE__)); 703ebccf1e3SJoseph Koshy KASSERT(LIST_EMPTY(&po->po_pmcs), 704ebccf1e3SJoseph Koshy ("[pmc,%d] PMC list not empty", __LINE__)); 705ebccf1e3SJoseph Koshy 706f263522aSJoseph Koshy /* de-configure the log file if present */ 707c5153e19SJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 708f263522aSJoseph Koshy pmclog_deconfigure_log(po); 709ebccf1e3SJoseph Koshy } 710ebccf1e3SJoseph Koshy 711ebccf1e3SJoseph Koshy /* 712ebccf1e3SJoseph Koshy * remove an owner process record if all conditions are met. 713ebccf1e3SJoseph Koshy */ 714ebccf1e3SJoseph Koshy 715ebccf1e3SJoseph Koshy static void 716ebccf1e3SJoseph Koshy pmc_maybe_remove_owner(struct pmc_owner *po) 717ebccf1e3SJoseph Koshy { 718ebccf1e3SJoseph Koshy 719ebccf1e3SJoseph Koshy PMCDBG(OWN,OMR,1, "maybe-remove-owner po=%p", po); 720ebccf1e3SJoseph Koshy 721ebccf1e3SJoseph Koshy /* 722ebccf1e3SJoseph Koshy * Remove owner record if 723ebccf1e3SJoseph Koshy * - this process does not own any PMCs 724ebccf1e3SJoseph Koshy * - this process has not allocated a system-wide sampling buffer 725ebccf1e3SJoseph Koshy */ 726ebccf1e3SJoseph Koshy 727ebccf1e3SJoseph Koshy if (LIST_EMPTY(&po->po_pmcs) && 728c5153e19SJoseph Koshy ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) { 729ebccf1e3SJoseph Koshy pmc_remove_owner(po); 730f263522aSJoseph Koshy pmc_destroy_owner_descriptor(po); 731ebccf1e3SJoseph Koshy } 732ebccf1e3SJoseph Koshy } 733ebccf1e3SJoseph Koshy 734ebccf1e3SJoseph Koshy /* 735ebccf1e3SJoseph Koshy * Add an association between a target process and a PMC. 736ebccf1e3SJoseph Koshy */ 737ebccf1e3SJoseph Koshy 738ebccf1e3SJoseph Koshy static void 739ebccf1e3SJoseph Koshy pmc_link_target_process(struct pmc *pm, struct pmc_process *pp) 740ebccf1e3SJoseph Koshy { 741ebccf1e3SJoseph Koshy int ri; 742ebccf1e3SJoseph Koshy struct pmc_target *pt; 743ebccf1e3SJoseph Koshy 744ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 745ebccf1e3SJoseph Koshy 746ebccf1e3SJoseph Koshy KASSERT(pm != NULL && pp != NULL, 747ebccf1e3SJoseph Koshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 748f263522aSJoseph Koshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 749f263522aSJoseph Koshy ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d", 750f263522aSJoseph Koshy __LINE__, pm, pp->pp_proc->p_pid)); 751ebccf1e3SJoseph Koshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < ((int) md->pmd_npmc - 1), 752ebccf1e3SJoseph Koshy ("[pmc,%d] Illegal reference count %d for process record %p", 753ebccf1e3SJoseph Koshy __LINE__, pp->pp_refcnt, (void *) pp)); 754ebccf1e3SJoseph Koshy 755c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 756ebccf1e3SJoseph Koshy 757ebccf1e3SJoseph Koshy PMCDBG(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p", 758ebccf1e3SJoseph Koshy pm, ri, pp); 759ebccf1e3SJoseph Koshy 760342ed5d9SRuslan Ermilov #ifdef DEBUG 761ebccf1e3SJoseph Koshy LIST_FOREACH(pt, &pm->pm_targets, pt_next) 762ebccf1e3SJoseph Koshy if (pt->pt_process == pp) 763ebccf1e3SJoseph Koshy KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets", 764ebccf1e3SJoseph Koshy __LINE__, pp, pm)); 765ebccf1e3SJoseph Koshy #endif 766ebccf1e3SJoseph Koshy 767ebccf1e3SJoseph Koshy MALLOC(pt, struct pmc_target *, sizeof(struct pmc_target), 768ebccf1e3SJoseph Koshy M_PMC, M_ZERO|M_WAITOK); 769ebccf1e3SJoseph Koshy 770ebccf1e3SJoseph Koshy pt->pt_process = pp; 771ebccf1e3SJoseph Koshy 772ebccf1e3SJoseph Koshy LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next); 773ebccf1e3SJoseph Koshy 774122eceefSJohn Baldwin atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc, 775122eceefSJohn Baldwin (uintptr_t)pm); 776ebccf1e3SJoseph Koshy 7776b8c8cd8SJoseph Koshy if (pm->pm_owner->po_owner == pp->pp_proc) 778c5153e19SJoseph Koshy pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER; 7796b8c8cd8SJoseph Koshy 780f263522aSJoseph Koshy /* 781f263522aSJoseph Koshy * Initialize the per-process values at this row index. 782f263522aSJoseph Koshy */ 783f263522aSJoseph Koshy pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ? 784f263522aSJoseph Koshy pm->pm_sc.pm_reloadcount : 0; 785f263522aSJoseph Koshy 786ebccf1e3SJoseph Koshy pp->pp_refcnt++; 787ebccf1e3SJoseph Koshy 788ebccf1e3SJoseph Koshy } 789ebccf1e3SJoseph Koshy 790ebccf1e3SJoseph Koshy /* 791ebccf1e3SJoseph Koshy * Removes the association between a target process and a PMC. 792ebccf1e3SJoseph Koshy */ 793ebccf1e3SJoseph Koshy 794ebccf1e3SJoseph Koshy static void 795ebccf1e3SJoseph Koshy pmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp) 796ebccf1e3SJoseph Koshy { 797ebccf1e3SJoseph Koshy int ri; 798f263522aSJoseph Koshy struct proc *p; 799ebccf1e3SJoseph Koshy struct pmc_target *ptgt; 800ebccf1e3SJoseph Koshy 801ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 802ebccf1e3SJoseph Koshy 803ebccf1e3SJoseph Koshy KASSERT(pm != NULL && pp != NULL, 804ebccf1e3SJoseph Koshy ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp)); 805ebccf1e3SJoseph Koshy 806ebccf1e3SJoseph Koshy KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt < (int) md->pmd_npmc, 807ebccf1e3SJoseph Koshy ("[pmc,%d] Illegal ref count %d on process record %p", 808ebccf1e3SJoseph Koshy __LINE__, pp->pp_refcnt, (void *) pp)); 809ebccf1e3SJoseph Koshy 810c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 811ebccf1e3SJoseph Koshy 812ebccf1e3SJoseph Koshy PMCDBG(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p", 813ebccf1e3SJoseph Koshy pm, ri, pp); 814ebccf1e3SJoseph Koshy 815ebccf1e3SJoseph Koshy KASSERT(pp->pp_pmcs[ri].pp_pmc == pm, 816ebccf1e3SJoseph Koshy ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__, 817ebccf1e3SJoseph Koshy ri, pm, pp->pp_pmcs[ri].pp_pmc)); 818ebccf1e3SJoseph Koshy 819ebccf1e3SJoseph Koshy pp->pp_pmcs[ri].pp_pmc = NULL; 820ebccf1e3SJoseph Koshy pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0; 821ebccf1e3SJoseph Koshy 822c5153e19SJoseph Koshy /* Remove owner-specific flags */ 823c5153e19SJoseph Koshy if (pm->pm_owner->po_owner == pp->pp_proc) { 824c5153e19SJoseph Koshy pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS; 825c5153e19SJoseph Koshy pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER; 826c5153e19SJoseph Koshy } 8276b8c8cd8SJoseph Koshy 828ebccf1e3SJoseph Koshy pp->pp_refcnt--; 829ebccf1e3SJoseph Koshy 830ebccf1e3SJoseph Koshy /* Remove the target process from the PMC structure */ 831ebccf1e3SJoseph Koshy LIST_FOREACH(ptgt, &pm->pm_targets, pt_next) 832ebccf1e3SJoseph Koshy if (ptgt->pt_process == pp) 833ebccf1e3SJoseph Koshy break; 834ebccf1e3SJoseph Koshy 835ebccf1e3SJoseph Koshy KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found " 836ebccf1e3SJoseph Koshy "in pmc %p", __LINE__, pp->pp_proc, pp, pm)); 837ebccf1e3SJoseph Koshy 838ebccf1e3SJoseph Koshy LIST_REMOVE(ptgt, pt_next); 839ebccf1e3SJoseph Koshy FREE(ptgt, M_PMC); 840f263522aSJoseph Koshy 841f263522aSJoseph Koshy /* if the PMC now lacks targets, send the owner a SIGIO */ 842f263522aSJoseph Koshy if (LIST_EMPTY(&pm->pm_targets)) { 843f263522aSJoseph Koshy p = pm->pm_owner->po_owner; 844f263522aSJoseph Koshy PROC_LOCK(p); 845f263522aSJoseph Koshy psignal(p, SIGIO); 846f263522aSJoseph Koshy PROC_UNLOCK(p); 847f263522aSJoseph Koshy 848f263522aSJoseph Koshy PMCDBG(PRC,SIG,2, "signalling proc=%p signal=%d", p, 849f263522aSJoseph Koshy SIGIO); 850ebccf1e3SJoseph Koshy } 851ebccf1e3SJoseph Koshy } 852ebccf1e3SJoseph Koshy 853ebccf1e3SJoseph Koshy /* 854ebccf1e3SJoseph Koshy * Check if PMC 'pm' may be attached to target process 't'. 855ebccf1e3SJoseph Koshy */ 856ebccf1e3SJoseph Koshy 857ebccf1e3SJoseph Koshy static int 858ebccf1e3SJoseph Koshy pmc_can_attach(struct pmc *pm, struct proc *t) 859ebccf1e3SJoseph Koshy { 860ebccf1e3SJoseph Koshy struct proc *o; /* pmc owner */ 861ebccf1e3SJoseph Koshy struct ucred *oc, *tc; /* owner, target credentials */ 862ebccf1e3SJoseph Koshy int decline_attach, i; 863ebccf1e3SJoseph Koshy 864ebccf1e3SJoseph Koshy /* 865ebccf1e3SJoseph Koshy * A PMC's owner can always attach that PMC to itself. 866ebccf1e3SJoseph Koshy */ 867ebccf1e3SJoseph Koshy 868ebccf1e3SJoseph Koshy if ((o = pm->pm_owner->po_owner) == t) 869ebccf1e3SJoseph Koshy return 0; 870ebccf1e3SJoseph Koshy 871ebccf1e3SJoseph Koshy PROC_LOCK(o); 872ebccf1e3SJoseph Koshy oc = o->p_ucred; 873ebccf1e3SJoseph Koshy crhold(oc); 874ebccf1e3SJoseph Koshy PROC_UNLOCK(o); 875ebccf1e3SJoseph Koshy 876ebccf1e3SJoseph Koshy PROC_LOCK(t); 877ebccf1e3SJoseph Koshy tc = t->p_ucred; 878ebccf1e3SJoseph Koshy crhold(tc); 879ebccf1e3SJoseph Koshy PROC_UNLOCK(t); 880ebccf1e3SJoseph Koshy 881ebccf1e3SJoseph Koshy /* 882ebccf1e3SJoseph Koshy * The effective uid of the PMC owner should match at least one 883ebccf1e3SJoseph Koshy * of the {effective,real,saved} uids of the target process. 884ebccf1e3SJoseph Koshy */ 885ebccf1e3SJoseph Koshy 886ebccf1e3SJoseph Koshy decline_attach = oc->cr_uid != tc->cr_uid && 887ebccf1e3SJoseph Koshy oc->cr_uid != tc->cr_svuid && 888ebccf1e3SJoseph Koshy oc->cr_uid != tc->cr_ruid; 889ebccf1e3SJoseph Koshy 890ebccf1e3SJoseph Koshy /* 891ebccf1e3SJoseph Koshy * Every one of the target's group ids, must be in the owner's 892ebccf1e3SJoseph Koshy * group list. 893ebccf1e3SJoseph Koshy */ 894ebccf1e3SJoseph Koshy for (i = 0; !decline_attach && i < tc->cr_ngroups; i++) 895ebccf1e3SJoseph Koshy decline_attach = !groupmember(tc->cr_groups[i], oc); 896ebccf1e3SJoseph Koshy 897ebccf1e3SJoseph Koshy /* check the read and saved gids too */ 898ebccf1e3SJoseph Koshy if (decline_attach == 0) 899ebccf1e3SJoseph Koshy decline_attach = !groupmember(tc->cr_rgid, oc) || 900ebccf1e3SJoseph Koshy !groupmember(tc->cr_svgid, oc); 901ebccf1e3SJoseph Koshy 902ebccf1e3SJoseph Koshy crfree(tc); 903ebccf1e3SJoseph Koshy crfree(oc); 904ebccf1e3SJoseph Koshy 905ebccf1e3SJoseph Koshy return !decline_attach; 906ebccf1e3SJoseph Koshy } 907ebccf1e3SJoseph Koshy 908ebccf1e3SJoseph Koshy /* 909ebccf1e3SJoseph Koshy * Attach a process to a PMC. 910ebccf1e3SJoseph Koshy */ 911ebccf1e3SJoseph Koshy 912ebccf1e3SJoseph Koshy static int 913ebccf1e3SJoseph Koshy pmc_attach_one_process(struct proc *p, struct pmc *pm) 914ebccf1e3SJoseph Koshy { 915ebccf1e3SJoseph Koshy int ri; 916f263522aSJoseph Koshy char *fullpath, *freepath; 917ebccf1e3SJoseph Koshy struct pmc_process *pp; 918ebccf1e3SJoseph Koshy 919ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 920ebccf1e3SJoseph Koshy 921ebccf1e3SJoseph Koshy PMCDBG(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm, 922c5153e19SJoseph Koshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 923ebccf1e3SJoseph Koshy 924ebccf1e3SJoseph Koshy /* 925ebccf1e3SJoseph Koshy * Locate the process descriptor corresponding to process 'p', 926ebccf1e3SJoseph Koshy * allocating space as needed. 927ebccf1e3SJoseph Koshy * 928ebccf1e3SJoseph Koshy * Verify that rowindex 'pm_rowindex' is free in the process 929ebccf1e3SJoseph Koshy * descriptor. 930ebccf1e3SJoseph Koshy * 931ebccf1e3SJoseph Koshy * If not, allocate space for a descriptor and link the 932ebccf1e3SJoseph Koshy * process descriptor and PMC. 933ebccf1e3SJoseph Koshy */ 934c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 935ebccf1e3SJoseph Koshy 936ebccf1e3SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL) 937ebccf1e3SJoseph Koshy return ENOMEM; 938ebccf1e3SJoseph Koshy 939ebccf1e3SJoseph Koshy if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */ 940ebccf1e3SJoseph Koshy return EEXIST; 941ebccf1e3SJoseph Koshy 942ebccf1e3SJoseph Koshy if (pp->pp_pmcs[ri].pp_pmc != NULL) 943ebccf1e3SJoseph Koshy return EBUSY; 944ebccf1e3SJoseph Koshy 945ebccf1e3SJoseph Koshy pmc_link_target_process(pm, pp); 946ebccf1e3SJoseph Koshy 947f263522aSJoseph Koshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) && 948f263522aSJoseph Koshy (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0) 949f263522aSJoseph Koshy pm->pm_flags |= PMC_F_NEEDS_LOGFILE; 950f263522aSJoseph Koshy 951f263522aSJoseph Koshy pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */ 952f263522aSJoseph Koshy 953f263522aSJoseph Koshy /* issue an attach event to a configured log file */ 954f263522aSJoseph Koshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) { 95515139246SJoseph Koshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 956f263522aSJoseph Koshy pmclog_process_pmcattach(pm, p->p_pid, fullpath); 957f263522aSJoseph Koshy if (freepath) 958f263522aSJoseph Koshy FREE(freepath, M_TEMP); 959f263522aSJoseph Koshy } 960ebccf1e3SJoseph Koshy /* mark process as using HWPMCs */ 961ebccf1e3SJoseph Koshy PROC_LOCK(p); 962ebccf1e3SJoseph Koshy p->p_flag |= P_HWPMC; 963ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 964ebccf1e3SJoseph Koshy 965ebccf1e3SJoseph Koshy return 0; 966ebccf1e3SJoseph Koshy } 967ebccf1e3SJoseph Koshy 968ebccf1e3SJoseph Koshy /* 969ebccf1e3SJoseph Koshy * Attach a process and optionally its children 970ebccf1e3SJoseph Koshy */ 971ebccf1e3SJoseph Koshy 972ebccf1e3SJoseph Koshy static int 973ebccf1e3SJoseph Koshy pmc_attach_process(struct proc *p, struct pmc *pm) 974ebccf1e3SJoseph Koshy { 975ebccf1e3SJoseph Koshy int error; 976ebccf1e3SJoseph Koshy struct proc *top; 977ebccf1e3SJoseph Koshy 978ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 979ebccf1e3SJoseph Koshy 980ebccf1e3SJoseph Koshy PMCDBG(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm, 981c5153e19SJoseph Koshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 982c5153e19SJoseph Koshy 983c5153e19SJoseph Koshy 984c5153e19SJoseph Koshy /* 985c5153e19SJoseph Koshy * If this PMC successfully allowed a GETMSR operation 986c5153e19SJoseph Koshy * in the past, disallow further ATTACHes. 987c5153e19SJoseph Koshy */ 988c5153e19SJoseph Koshy 989c5153e19SJoseph Koshy if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0) 990c5153e19SJoseph Koshy return EPERM; 991ebccf1e3SJoseph Koshy 992ebccf1e3SJoseph Koshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 993ebccf1e3SJoseph Koshy return pmc_attach_one_process(p, pm); 994ebccf1e3SJoseph Koshy 995ebccf1e3SJoseph Koshy /* 996ebccf1e3SJoseph Koshy * Traverse all child processes, attaching them to 997ebccf1e3SJoseph Koshy * this PMC. 998ebccf1e3SJoseph Koshy */ 999ebccf1e3SJoseph Koshy 1000ebccf1e3SJoseph Koshy sx_slock(&proctree_lock); 1001ebccf1e3SJoseph Koshy 1002ebccf1e3SJoseph Koshy top = p; 1003ebccf1e3SJoseph Koshy 1004ebccf1e3SJoseph Koshy for (;;) { 1005ebccf1e3SJoseph Koshy if ((error = pmc_attach_one_process(p, pm)) != 0) 1006ebccf1e3SJoseph Koshy break; 1007ebccf1e3SJoseph Koshy if (!LIST_EMPTY(&p->p_children)) 1008ebccf1e3SJoseph Koshy p = LIST_FIRST(&p->p_children); 1009ebccf1e3SJoseph Koshy else for (;;) { 1010ebccf1e3SJoseph Koshy if (p == top) 1011ebccf1e3SJoseph Koshy goto done; 1012ebccf1e3SJoseph Koshy if (LIST_NEXT(p, p_sibling)) { 1013ebccf1e3SJoseph Koshy p = LIST_NEXT(p, p_sibling); 1014ebccf1e3SJoseph Koshy break; 1015ebccf1e3SJoseph Koshy } 1016ebccf1e3SJoseph Koshy p = p->p_pptr; 1017ebccf1e3SJoseph Koshy } 1018ebccf1e3SJoseph Koshy } 1019ebccf1e3SJoseph Koshy 1020ebccf1e3SJoseph Koshy if (error) 1021ebccf1e3SJoseph Koshy (void) pmc_detach_process(top, pm); 1022ebccf1e3SJoseph Koshy 1023ebccf1e3SJoseph Koshy done: 1024ebccf1e3SJoseph Koshy sx_sunlock(&proctree_lock); 1025ebccf1e3SJoseph Koshy return error; 1026ebccf1e3SJoseph Koshy } 1027ebccf1e3SJoseph Koshy 1028ebccf1e3SJoseph Koshy /* 1029ebccf1e3SJoseph Koshy * Detach a process from a PMC. If there are no other PMCs tracking 1030ebccf1e3SJoseph Koshy * this process, remove the process structure from its hash table. If 1031ebccf1e3SJoseph Koshy * 'flags' contains PMC_FLAG_REMOVE, then free the process structure. 1032ebccf1e3SJoseph Koshy */ 1033ebccf1e3SJoseph Koshy 1034ebccf1e3SJoseph Koshy static int 1035ebccf1e3SJoseph Koshy pmc_detach_one_process(struct proc *p, struct pmc *pm, int flags) 1036ebccf1e3SJoseph Koshy { 1037ebccf1e3SJoseph Koshy int ri; 1038ebccf1e3SJoseph Koshy struct pmc_process *pp; 1039ebccf1e3SJoseph Koshy 1040ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1041ebccf1e3SJoseph Koshy 1042ebccf1e3SJoseph Koshy KASSERT(pm != NULL, 1043ebccf1e3SJoseph Koshy ("[pmc,%d] null pm pointer", __LINE__)); 1044ebccf1e3SJoseph Koshy 1045c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 1046ebccf1e3SJoseph Koshy 1047c5153e19SJoseph Koshy PMCDBG(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x", 1048c5153e19SJoseph Koshy pm, ri, p, p->p_pid, p->p_comm, flags); 1049ebccf1e3SJoseph Koshy 1050ebccf1e3SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) 1051ebccf1e3SJoseph Koshy return ESRCH; 1052ebccf1e3SJoseph Koshy 1053ebccf1e3SJoseph Koshy if (pp->pp_pmcs[ri].pp_pmc != pm) 1054ebccf1e3SJoseph Koshy return EINVAL; 1055ebccf1e3SJoseph Koshy 1056ebccf1e3SJoseph Koshy pmc_unlink_target_process(pm, pp); 1057ebccf1e3SJoseph Koshy 1058f263522aSJoseph Koshy /* Issue a detach entry if a log file is configured */ 1059f263522aSJoseph Koshy if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) 1060f263522aSJoseph Koshy pmclog_process_pmcdetach(pm, p->p_pid); 1061f263522aSJoseph Koshy 1062ebccf1e3SJoseph Koshy /* 1063ebccf1e3SJoseph Koshy * If there are no PMCs targetting this process, we remove its 1064ebccf1e3SJoseph Koshy * descriptor from the target hash table and unset the P_HWPMC 1065ebccf1e3SJoseph Koshy * flag in the struct proc. 1066ebccf1e3SJoseph Koshy */ 1067ebccf1e3SJoseph Koshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1068ebccf1e3SJoseph Koshy ("[pmc,%d] Illegal refcnt %d for process struct %p", 1069ebccf1e3SJoseph Koshy __LINE__, pp->pp_refcnt, pp)); 1070ebccf1e3SJoseph Koshy 1071ebccf1e3SJoseph Koshy if (pp->pp_refcnt != 0) /* still a target of some PMC */ 1072ebccf1e3SJoseph Koshy return 0; 1073ebccf1e3SJoseph Koshy 1074ebccf1e3SJoseph Koshy pmc_remove_process_descriptor(pp); 1075ebccf1e3SJoseph Koshy 1076ebccf1e3SJoseph Koshy if (flags & PMC_FLAG_REMOVE) 1077ebccf1e3SJoseph Koshy FREE(pp, M_PMC); 1078ebccf1e3SJoseph Koshy 1079ebccf1e3SJoseph Koshy PROC_LOCK(p); 1080ebccf1e3SJoseph Koshy p->p_flag &= ~P_HWPMC; 1081ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 1082ebccf1e3SJoseph Koshy 1083ebccf1e3SJoseph Koshy return 0; 1084ebccf1e3SJoseph Koshy } 1085ebccf1e3SJoseph Koshy 1086ebccf1e3SJoseph Koshy /* 1087ebccf1e3SJoseph Koshy * Detach a process and optionally its descendants from a PMC. 1088ebccf1e3SJoseph Koshy */ 1089ebccf1e3SJoseph Koshy 1090ebccf1e3SJoseph Koshy static int 1091ebccf1e3SJoseph Koshy pmc_detach_process(struct proc *p, struct pmc *pm) 1092ebccf1e3SJoseph Koshy { 1093ebccf1e3SJoseph Koshy struct proc *top; 1094ebccf1e3SJoseph Koshy 1095ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1096ebccf1e3SJoseph Koshy 1097ebccf1e3SJoseph Koshy PMCDBG(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm, 1098c5153e19SJoseph Koshy PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm); 1099ebccf1e3SJoseph Koshy 1100ebccf1e3SJoseph Koshy if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0) 1101ebccf1e3SJoseph Koshy return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1102ebccf1e3SJoseph Koshy 1103ebccf1e3SJoseph Koshy /* 1104ebccf1e3SJoseph Koshy * Traverse all children, detaching them from this PMC. We 1105ebccf1e3SJoseph Koshy * ignore errors since we could be detaching a PMC from a 1106ebccf1e3SJoseph Koshy * partially attached proc tree. 1107ebccf1e3SJoseph Koshy */ 1108ebccf1e3SJoseph Koshy 1109ebccf1e3SJoseph Koshy sx_slock(&proctree_lock); 1110ebccf1e3SJoseph Koshy 1111ebccf1e3SJoseph Koshy top = p; 1112ebccf1e3SJoseph Koshy 1113ebccf1e3SJoseph Koshy for (;;) { 1114ebccf1e3SJoseph Koshy (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE); 1115ebccf1e3SJoseph Koshy 1116ebccf1e3SJoseph Koshy if (!LIST_EMPTY(&p->p_children)) 1117ebccf1e3SJoseph Koshy p = LIST_FIRST(&p->p_children); 1118ebccf1e3SJoseph Koshy else for (;;) { 1119ebccf1e3SJoseph Koshy if (p == top) 1120ebccf1e3SJoseph Koshy goto done; 1121ebccf1e3SJoseph Koshy if (LIST_NEXT(p, p_sibling)) { 1122ebccf1e3SJoseph Koshy p = LIST_NEXT(p, p_sibling); 1123ebccf1e3SJoseph Koshy break; 1124ebccf1e3SJoseph Koshy } 1125ebccf1e3SJoseph Koshy p = p->p_pptr; 1126ebccf1e3SJoseph Koshy } 1127ebccf1e3SJoseph Koshy } 1128ebccf1e3SJoseph Koshy 1129ebccf1e3SJoseph Koshy done: 1130ebccf1e3SJoseph Koshy sx_sunlock(&proctree_lock); 1131f263522aSJoseph Koshy 1132f263522aSJoseph Koshy if (LIST_EMPTY(&pm->pm_targets)) 1133f263522aSJoseph Koshy pm->pm_flags &= ~PMC_F_ATTACH_DONE; 1134f263522aSJoseph Koshy 1135ebccf1e3SJoseph Koshy return 0; 1136ebccf1e3SJoseph Koshy } 1137ebccf1e3SJoseph Koshy 1138ebccf1e3SJoseph Koshy 1139ebccf1e3SJoseph Koshy /* 1140ebccf1e3SJoseph Koshy * Thread context switch IN 1141ebccf1e3SJoseph Koshy */ 1142ebccf1e3SJoseph Koshy 1143f263522aSJoseph Koshy static void 1144f263522aSJoseph Koshy pmc_process_csw_in(struct thread *td) 1145ebccf1e3SJoseph Koshy { 1146ebccf1e3SJoseph Koshy int cpu; 1147ebccf1e3SJoseph Koshy unsigned int ri; 1148ebccf1e3SJoseph Koshy struct pmc *pm; 1149ebccf1e3SJoseph Koshy struct proc *p; 1150ebccf1e3SJoseph Koshy struct pmc_cpu *pc; 1151ebccf1e3SJoseph Koshy struct pmc_hw *phw; 1152ebccf1e3SJoseph Koshy struct pmc_process *pp; 1153ebccf1e3SJoseph Koshy pmc_value_t newvalue; 1154ebccf1e3SJoseph Koshy 1155ebccf1e3SJoseph Koshy p = td->td_proc; 1156ebccf1e3SJoseph Koshy 1157ebccf1e3SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL) 1158f263522aSJoseph Koshy return; 1159ebccf1e3SJoseph Koshy 1160ebccf1e3SJoseph Koshy KASSERT(pp->pp_proc == td->td_proc, 1161ebccf1e3SJoseph Koshy ("[pmc,%d] not my thread state", __LINE__)); 1162ebccf1e3SJoseph Koshy 1163f263522aSJoseph Koshy critical_enter(); /* no preemption from this point */ 1164ebccf1e3SJoseph Koshy 1165ebccf1e3SJoseph Koshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1166ebccf1e3SJoseph Koshy 1167f263522aSJoseph Koshy PMCDBG(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1168ebccf1e3SJoseph Koshy p->p_pid, p->p_comm, pp); 1169ebccf1e3SJoseph Koshy 1170ebccf1e3SJoseph Koshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 1171ebccf1e3SJoseph Koshy ("[pmc,%d] wierd CPU id %d", __LINE__, cpu)); 1172ebccf1e3SJoseph Koshy 1173ebccf1e3SJoseph Koshy pc = pmc_pcpu[cpu]; 1174ebccf1e3SJoseph Koshy 1175ebccf1e3SJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1176ebccf1e3SJoseph Koshy 1177ebccf1e3SJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL) 1178ebccf1e3SJoseph Koshy continue; 1179ebccf1e3SJoseph Koshy 1180c5153e19SJoseph Koshy KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)), 1181ebccf1e3SJoseph Koshy ("[pmc,%d] Target PMC in non-virtual mode (%d)", 1182c5153e19SJoseph Koshy __LINE__, PMC_TO_MODE(pm))); 1183ebccf1e3SJoseph Koshy 1184c5153e19SJoseph Koshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1185ebccf1e3SJoseph Koshy ("[pmc,%d] Row index mismatch pmc %d != ri %d", 1186c5153e19SJoseph Koshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1187ebccf1e3SJoseph Koshy 1188ebccf1e3SJoseph Koshy /* 1189ebccf1e3SJoseph Koshy * Only PMCs that are marked as 'RUNNING' need 1190ebccf1e3SJoseph Koshy * be placed on hardware. 1191ebccf1e3SJoseph Koshy */ 1192ebccf1e3SJoseph Koshy 1193ebccf1e3SJoseph Koshy if (pm->pm_state != PMC_STATE_RUNNING) 1194ebccf1e3SJoseph Koshy continue; 1195ebccf1e3SJoseph Koshy 1196ebccf1e3SJoseph Koshy /* increment PMC runcount */ 1197ebccf1e3SJoseph Koshy atomic_add_rel_32(&pm->pm_runcount, 1); 1198ebccf1e3SJoseph Koshy 1199ebccf1e3SJoseph Koshy /* configure the HWPMC we are going to use. */ 1200ebccf1e3SJoseph Koshy md->pmd_config_pmc(cpu, ri, pm); 1201ebccf1e3SJoseph Koshy 1202ebccf1e3SJoseph Koshy phw = pc->pc_hwpmcs[ri]; 1203ebccf1e3SJoseph Koshy 1204ebccf1e3SJoseph Koshy KASSERT(phw != NULL, 1205ebccf1e3SJoseph Koshy ("[pmc,%d] null hw pointer", __LINE__)); 1206ebccf1e3SJoseph Koshy 1207ebccf1e3SJoseph Koshy KASSERT(phw->phw_pmc == pm, 1208ebccf1e3SJoseph Koshy ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__, 1209ebccf1e3SJoseph Koshy phw->phw_pmc, pm)); 1210ebccf1e3SJoseph Koshy 1211f263522aSJoseph Koshy /* 1212f263522aSJoseph Koshy * Write out saved value and start the PMC. 1213f263522aSJoseph Koshy * 1214f263522aSJoseph Koshy * Sampling PMCs use a per-process value, while 1215f263522aSJoseph Koshy * counting mode PMCs use a per-pmc value that is 1216f263522aSJoseph Koshy * inherited across descendants. 1217f263522aSJoseph Koshy */ 1218f263522aSJoseph Koshy if (PMC_TO_MODE(pm) == PMC_MODE_TS) { 1219f263522aSJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1220f263522aSJoseph Koshy newvalue = PMC_PCPU_SAVED(cpu,ri) = 1221f263522aSJoseph Koshy pp->pp_pmcs[ri].pp_pmcval; 1222f263522aSJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1223f263522aSJoseph Koshy } else { 1224f263522aSJoseph Koshy KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC, 1225f263522aSJoseph Koshy ("[pmc,%d] illegal mode=%d", __LINE__, 1226f263522aSJoseph Koshy PMC_TO_MODE(pm))); 1227ebccf1e3SJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1228ebccf1e3SJoseph Koshy newvalue = PMC_PCPU_SAVED(cpu, ri) = 1229ebccf1e3SJoseph Koshy pm->pm_gv.pm_savedvalue; 1230ebccf1e3SJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1231f263522aSJoseph Koshy } 1232f263522aSJoseph Koshy 1233f263522aSJoseph Koshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue); 1234ebccf1e3SJoseph Koshy 1235ebccf1e3SJoseph Koshy md->pmd_write_pmc(cpu, ri, newvalue); 1236ebccf1e3SJoseph Koshy md->pmd_start_pmc(cpu, ri); 1237ebccf1e3SJoseph Koshy } 1238ebccf1e3SJoseph Koshy 1239ebccf1e3SJoseph Koshy /* 1240ebccf1e3SJoseph Koshy * perform any other architecture/cpu dependent thread 1241ebccf1e3SJoseph Koshy * switch-in actions. 1242ebccf1e3SJoseph Koshy */ 1243ebccf1e3SJoseph Koshy 12446b8c8cd8SJoseph Koshy (void) (*md->pmd_switch_in)(pc, pp); 1245ebccf1e3SJoseph Koshy 1246ebccf1e3SJoseph Koshy critical_exit(); 1247ebccf1e3SJoseph Koshy 1248ebccf1e3SJoseph Koshy } 1249ebccf1e3SJoseph Koshy 1250ebccf1e3SJoseph Koshy /* 1251ebccf1e3SJoseph Koshy * Thread context switch OUT. 1252ebccf1e3SJoseph Koshy */ 1253ebccf1e3SJoseph Koshy 1254f263522aSJoseph Koshy static void 1255f263522aSJoseph Koshy pmc_process_csw_out(struct thread *td) 1256ebccf1e3SJoseph Koshy { 1257ebccf1e3SJoseph Koshy int cpu; 1258f263522aSJoseph Koshy enum pmc_mode mode; 1259ebccf1e3SJoseph Koshy unsigned int ri; 1260ebccf1e3SJoseph Koshy struct pmc *pm; 1261ebccf1e3SJoseph Koshy struct proc *p; 1262ebccf1e3SJoseph Koshy struct pmc_cpu *pc; 1263ebccf1e3SJoseph Koshy struct pmc_process *pp; 1264f263522aSJoseph Koshy int64_t tmp; 1265f263522aSJoseph Koshy pmc_value_t newvalue; 1266ebccf1e3SJoseph Koshy 1267ebccf1e3SJoseph Koshy /* 1268ebccf1e3SJoseph Koshy * Locate our process descriptor; this may be NULL if 1269ebccf1e3SJoseph Koshy * this process is exiting and we have already removed 1270ebccf1e3SJoseph Koshy * the process from the target process table. 1271ebccf1e3SJoseph Koshy * 1272ebccf1e3SJoseph Koshy * Note that due to kernel preemption, multiple 1273ebccf1e3SJoseph Koshy * context switches may happen while the process is 1274ebccf1e3SJoseph Koshy * exiting. 1275ebccf1e3SJoseph Koshy * 1276ebccf1e3SJoseph Koshy * Note also that if the target process cannot be 1277ebccf1e3SJoseph Koshy * found we still need to deconfigure any PMCs that 1278ebccf1e3SJoseph Koshy * are currently running on hardware. 1279ebccf1e3SJoseph Koshy */ 1280ebccf1e3SJoseph Koshy 1281ebccf1e3SJoseph Koshy p = td->td_proc; 1282ebccf1e3SJoseph Koshy pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE); 1283ebccf1e3SJoseph Koshy 1284ebccf1e3SJoseph Koshy /* 1285ebccf1e3SJoseph Koshy * save PMCs 1286ebccf1e3SJoseph Koshy */ 1287ebccf1e3SJoseph Koshy 1288ebccf1e3SJoseph Koshy critical_enter(); 1289ebccf1e3SJoseph Koshy 1290ebccf1e3SJoseph Koshy cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */ 1291ebccf1e3SJoseph Koshy 1292f263522aSJoseph Koshy PMCDBG(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p, 1293ebccf1e3SJoseph Koshy p->p_pid, p->p_comm, pp); 1294ebccf1e3SJoseph Koshy 1295ebccf1e3SJoseph Koshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 1296ebccf1e3SJoseph Koshy ("[pmc,%d wierd CPU id %d", __LINE__, cpu)); 1297ebccf1e3SJoseph Koshy 1298ebccf1e3SJoseph Koshy pc = pmc_pcpu[cpu]; 1299ebccf1e3SJoseph Koshy 1300ebccf1e3SJoseph Koshy /* 1301ebccf1e3SJoseph Koshy * When a PMC gets unlinked from a target PMC, it will 1302ebccf1e3SJoseph Koshy * be removed from the target's pp_pmc[] array. 1303ebccf1e3SJoseph Koshy * 1304ebccf1e3SJoseph Koshy * However, on a MP system, the target could have been 1305ebccf1e3SJoseph Koshy * executing on another CPU at the time of the unlink. 1306ebccf1e3SJoseph Koshy * So, at context switch OUT time, we need to look at 1307ebccf1e3SJoseph Koshy * the hardware to determine if a PMC is scheduled on 1308ebccf1e3SJoseph Koshy * it. 1309ebccf1e3SJoseph Koshy */ 1310ebccf1e3SJoseph Koshy 1311ebccf1e3SJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) { 1312ebccf1e3SJoseph Koshy 1313c5153e19SJoseph Koshy pm = NULL; 1314c5153e19SJoseph Koshy (void) (*md->pmd_get_config)(cpu, ri, &pm); 1315ebccf1e3SJoseph Koshy 1316ebccf1e3SJoseph Koshy if (pm == NULL) /* nothing at this row index */ 1317ebccf1e3SJoseph Koshy continue; 1318ebccf1e3SJoseph Koshy 1319f263522aSJoseph Koshy mode = PMC_TO_MODE(pm); 1320f263522aSJoseph Koshy if (!PMC_IS_VIRTUAL_MODE(mode)) 1321ebccf1e3SJoseph Koshy continue; /* not a process virtual PMC */ 1322ebccf1e3SJoseph Koshy 1323c5153e19SJoseph Koshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 1324ebccf1e3SJoseph Koshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 1325c5153e19SJoseph Koshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 1326ebccf1e3SJoseph Koshy 1327f263522aSJoseph Koshy /* Stop hardware if not already stopped */ 1328fbf1556dSJoseph Koshy if (pm->pm_stalled == 0) 1329ebccf1e3SJoseph Koshy md->pmd_stop_pmc(cpu, ri); 1330ebccf1e3SJoseph Koshy 1331ebccf1e3SJoseph Koshy /* reduce this PMC's runcount */ 1332ebccf1e3SJoseph Koshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 1333ebccf1e3SJoseph Koshy 1334ebccf1e3SJoseph Koshy /* 1335ebccf1e3SJoseph Koshy * If this PMC is associated with this process, 1336ebccf1e3SJoseph Koshy * save the reading. 1337ebccf1e3SJoseph Koshy */ 1338ebccf1e3SJoseph Koshy 1339ebccf1e3SJoseph Koshy if (pp != NULL && pp->pp_pmcs[ri].pp_pmc != NULL) { 1340ebccf1e3SJoseph Koshy 1341ebccf1e3SJoseph Koshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 1342f263522aSJoseph Koshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__, 1343f263522aSJoseph Koshy pm, ri, pp->pp_pmcs[ri].pp_pmc)); 1344ebccf1e3SJoseph Koshy 1345ebccf1e3SJoseph Koshy KASSERT(pp->pp_refcnt > 0, 1346ebccf1e3SJoseph Koshy ("[pmc,%d] pp refcnt = %d", __LINE__, 1347ebccf1e3SJoseph Koshy pp->pp_refcnt)); 1348ebccf1e3SJoseph Koshy 1349ebccf1e3SJoseph Koshy md->pmd_read_pmc(cpu, ri, &newvalue); 1350ebccf1e3SJoseph Koshy 1351ebccf1e3SJoseph Koshy tmp = newvalue - PMC_PCPU_SAVED(cpu,ri); 1352ebccf1e3SJoseph Koshy 1353f263522aSJoseph Koshy PMCDBG(CSW,SWI,1,"cpu=%d ri=%d tmp=%jd", cpu, ri, 1354f263522aSJoseph Koshy tmp); 1355f263522aSJoseph Koshy 1356f263522aSJoseph Koshy if (mode == PMC_MODE_TS) { 1357f263522aSJoseph Koshy 1358f263522aSJoseph Koshy /* 1359f263522aSJoseph Koshy * For sampling process-virtual PMCs, 1360f263522aSJoseph Koshy * we expect the count to be 1361f263522aSJoseph Koshy * decreasing as the 'value' 1362f263522aSJoseph Koshy * programmed into the PMC is the 1363f263522aSJoseph Koshy * number of events to be seen till 1364f263522aSJoseph Koshy * the next sampling interrupt. 1365f263522aSJoseph Koshy */ 1366f263522aSJoseph Koshy if (tmp < 0) 1367f263522aSJoseph Koshy tmp += pm->pm_sc.pm_reloadcount; 1368f263522aSJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1369f263522aSJoseph Koshy pp->pp_pmcs[ri].pp_pmcval -= tmp; 1370f263522aSJoseph Koshy if ((int64_t) pp->pp_pmcs[ri].pp_pmcval < 0) 1371f263522aSJoseph Koshy pp->pp_pmcs[ri].pp_pmcval += 1372f263522aSJoseph Koshy pm->pm_sc.pm_reloadcount; 1373f263522aSJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1374f263522aSJoseph Koshy 1375f263522aSJoseph Koshy } else { 1376f263522aSJoseph Koshy 1377f263522aSJoseph Koshy /* 1378f263522aSJoseph Koshy * For counting process-virtual PMCs, 1379f263522aSJoseph Koshy * we expect the count to be 1380f263522aSJoseph Koshy * increasing monotonically, modulo a 64 1381f263522aSJoseph Koshy * bit wraparound. 1382f263522aSJoseph Koshy */ 1383ebccf1e3SJoseph Koshy KASSERT((int64_t) tmp >= 0, 1384ebccf1e3SJoseph Koshy ("[pmc,%d] negative increment cpu=%d " 1385ebccf1e3SJoseph Koshy "ri=%d newvalue=%jx saved=%jx " 1386ebccf1e3SJoseph Koshy "incr=%jx", __LINE__, cpu, ri, 1387f263522aSJoseph Koshy newvalue, PMC_PCPU_SAVED(cpu,ri), tmp)); 1388ebccf1e3SJoseph Koshy 1389ebccf1e3SJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 1390ebccf1e3SJoseph Koshy pm->pm_gv.pm_savedvalue += tmp; 1391ebccf1e3SJoseph Koshy pp->pp_pmcs[ri].pp_pmcval += tmp; 1392ebccf1e3SJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 1393ebccf1e3SJoseph Koshy 1394f263522aSJoseph Koshy if (pm->pm_flags & PMC_F_LOG_PROCCSW) 1395f263522aSJoseph Koshy pmclog_process_proccsw(pm, pp, tmp); 1396f263522aSJoseph Koshy } 1397ebccf1e3SJoseph Koshy } 1398ebccf1e3SJoseph Koshy 1399ebccf1e3SJoseph Koshy /* mark hardware as free */ 1400ebccf1e3SJoseph Koshy md->pmd_config_pmc(cpu, ri, NULL); 1401ebccf1e3SJoseph Koshy } 1402ebccf1e3SJoseph Koshy 1403ebccf1e3SJoseph Koshy /* 1404ebccf1e3SJoseph Koshy * perform any other architecture/cpu dependent thread 1405ebccf1e3SJoseph Koshy * switch out functions. 1406ebccf1e3SJoseph Koshy */ 1407ebccf1e3SJoseph Koshy 14086b8c8cd8SJoseph Koshy (void) (*md->pmd_switch_out)(pc, pp); 1409ebccf1e3SJoseph Koshy 1410ebccf1e3SJoseph Koshy critical_exit(); 1411f263522aSJoseph Koshy } 1412f263522aSJoseph Koshy 1413f263522aSJoseph Koshy /* 1414f263522aSJoseph Koshy * The 'hook' invoked from the kernel proper 1415f263522aSJoseph Koshy */ 1416f263522aSJoseph Koshy 1417f263522aSJoseph Koshy 1418342ed5d9SRuslan Ermilov #ifdef DEBUG 1419f263522aSJoseph Koshy const char *pmc_hooknames[] = { 1420f263522aSJoseph Koshy "", 1421f263522aSJoseph Koshy "EXIT", 1422f263522aSJoseph Koshy "EXEC", 1423f263522aSJoseph Koshy "FORK", 1424f263522aSJoseph Koshy "CSW-IN", 1425f263522aSJoseph Koshy "CSW-OUT", 1426f263522aSJoseph Koshy "SAMPLE" 1427f263522aSJoseph Koshy }; 1428f263522aSJoseph Koshy #endif 1429f263522aSJoseph Koshy 1430f263522aSJoseph Koshy static int 1431f263522aSJoseph Koshy pmc_hook_handler(struct thread *td, int function, void *arg) 1432f263522aSJoseph Koshy { 1433f263522aSJoseph Koshy 1434f263522aSJoseph Koshy PMCDBG(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function, 1435f263522aSJoseph Koshy pmc_hooknames[function], arg); 1436f263522aSJoseph Koshy 1437f263522aSJoseph Koshy switch (function) 1438f263522aSJoseph Koshy { 1439f263522aSJoseph Koshy 1440f263522aSJoseph Koshy /* 1441f263522aSJoseph Koshy * Process exec() 1442f263522aSJoseph Koshy */ 1443f263522aSJoseph Koshy 1444f263522aSJoseph Koshy case PMC_FN_PROCESS_EXEC: 1445f263522aSJoseph Koshy { 1446f263522aSJoseph Koshy char *fullpath, *freepath; 1447f263522aSJoseph Koshy unsigned int ri; 1448f263522aSJoseph Koshy int is_using_hwpmcs; 1449f263522aSJoseph Koshy struct pmc *pm; 1450f263522aSJoseph Koshy struct proc *p; 1451f263522aSJoseph Koshy struct pmc_owner *po; 1452f263522aSJoseph Koshy struct pmc_process *pp; 145315139246SJoseph Koshy struct pmckern_procexec *pk; 1454f263522aSJoseph Koshy 1455f263522aSJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1456f263522aSJoseph Koshy 1457f263522aSJoseph Koshy p = td->td_proc; 145815139246SJoseph Koshy pmc_getfilename(p->p_textvp, &fullpath, &freepath); 145915139246SJoseph Koshy 146015139246SJoseph Koshy pk = (struct pmckern_procexec *) arg; 1461f263522aSJoseph Koshy 1462f263522aSJoseph Koshy /* Inform owners of SS mode PMCs of the exec event. */ 1463f263522aSJoseph Koshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 1464f263522aSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 146515139246SJoseph Koshy pmclog_process_procexec(po, PMC_ID_INVALID, 146615139246SJoseph Koshy p->p_pid, pk->pm_entryaddr, fullpath); 1467f263522aSJoseph Koshy 1468f263522aSJoseph Koshy PROC_LOCK(p); 1469f263522aSJoseph Koshy is_using_hwpmcs = p->p_flag & P_HWPMC; 1470f263522aSJoseph Koshy PROC_UNLOCK(p); 1471f263522aSJoseph Koshy 1472f263522aSJoseph Koshy if (!is_using_hwpmcs) { 1473f263522aSJoseph Koshy if (freepath) 1474f263522aSJoseph Koshy FREE(freepath, M_TEMP); 1475f263522aSJoseph Koshy break; 1476f263522aSJoseph Koshy } 1477f263522aSJoseph Koshy 1478f263522aSJoseph Koshy /* 1479f263522aSJoseph Koshy * PMCs are not inherited across an exec(): remove any 1480f263522aSJoseph Koshy * PMCs that this process is the owner of. 1481f263522aSJoseph Koshy */ 1482f263522aSJoseph Koshy 1483f263522aSJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 1484f263522aSJoseph Koshy pmc_remove_owner(po); 1485f263522aSJoseph Koshy pmc_destroy_owner_descriptor(po); 1486f263522aSJoseph Koshy } 1487f263522aSJoseph Koshy 1488f263522aSJoseph Koshy /* 14892b01a084SJoseph Koshy * If the process being exec'ed is not the target of any 14902b01a084SJoseph Koshy * PMC, we are done. 1491f263522aSJoseph Koshy */ 14922b01a084SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) { 14932b01a084SJoseph Koshy if (freepath) 14942b01a084SJoseph Koshy FREE(freepath, M_TEMP); 1495f263522aSJoseph Koshy break; 14962b01a084SJoseph Koshy } 1497f263522aSJoseph Koshy 1498f263522aSJoseph Koshy /* 1499f263522aSJoseph Koshy * Log the exec event to all monitoring owners. Skip 1500f263522aSJoseph Koshy * owners who have already recieved the event because 15012b01a084SJoseph Koshy * they had system sampling PMCs active. 1502f263522aSJoseph Koshy */ 1503f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 1504f263522aSJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 1505f263522aSJoseph Koshy po = pm->pm_owner; 1506f263522aSJoseph Koshy if (po->po_sscount == 0 && 1507f263522aSJoseph Koshy po->po_flags & PMC_PO_OWNS_LOGFILE) 150815139246SJoseph Koshy pmclog_process_procexec(po, pm->pm_id, 150915139246SJoseph Koshy p->p_pid, pk->pm_entryaddr, 1510f263522aSJoseph Koshy fullpath); 1511f263522aSJoseph Koshy } 1512f263522aSJoseph Koshy 1513f263522aSJoseph Koshy if (freepath) 1514f263522aSJoseph Koshy FREE(freepath, M_TEMP); 1515f263522aSJoseph Koshy 1516f263522aSJoseph Koshy 1517f263522aSJoseph Koshy PMCDBG(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d", 151815139246SJoseph Koshy p, p->p_pid, p->p_comm, pk->pm_credentialschanged); 1519f263522aSJoseph Koshy 152015139246SJoseph Koshy if (pk->pm_credentialschanged == 0) /* no change */ 1521f263522aSJoseph Koshy break; 1522f263522aSJoseph Koshy 1523f263522aSJoseph Koshy /* 1524f263522aSJoseph Koshy * If the newly exec()'ed process has a different credential 1525f263522aSJoseph Koshy * than before, allow it to be the target of a PMC only if 1526f263522aSJoseph Koshy * the PMC's owner has sufficient priviledge. 1527f263522aSJoseph Koshy */ 1528f263522aSJoseph Koshy 1529f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 1530f263522aSJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) 1531f263522aSJoseph Koshy if (pmc_can_attach(pm, td->td_proc) != 0) 1532f263522aSJoseph Koshy pmc_detach_one_process(td->td_proc, 1533f263522aSJoseph Koshy pm, PMC_FLAG_NONE); 1534f263522aSJoseph Koshy 1535f263522aSJoseph Koshy KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt < (int) md->pmd_npmc, 1536f263522aSJoseph Koshy ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__, 1537f263522aSJoseph Koshy pp->pp_refcnt, pp)); 1538f263522aSJoseph Koshy 1539f263522aSJoseph Koshy /* 1540f263522aSJoseph Koshy * If this process is no longer the target of any 1541f263522aSJoseph Koshy * PMCs, we can remove the process entry and free 1542f263522aSJoseph Koshy * up space. 1543f263522aSJoseph Koshy */ 1544f263522aSJoseph Koshy 1545f263522aSJoseph Koshy if (pp->pp_refcnt == 0) { 1546f263522aSJoseph Koshy pmc_remove_process_descriptor(pp); 1547f263522aSJoseph Koshy FREE(pp, M_PMC); 1548f263522aSJoseph Koshy break; 1549f263522aSJoseph Koshy } 1550ebccf1e3SJoseph Koshy 1551ebccf1e3SJoseph Koshy } 1552ebccf1e3SJoseph Koshy break; 1553ebccf1e3SJoseph Koshy 1554f263522aSJoseph Koshy case PMC_FN_CSW_IN: 1555f263522aSJoseph Koshy pmc_process_csw_in(td); 1556f263522aSJoseph Koshy break; 1557f263522aSJoseph Koshy 1558f263522aSJoseph Koshy case PMC_FN_CSW_OUT: 1559f263522aSJoseph Koshy pmc_process_csw_out(td); 1560f263522aSJoseph Koshy break; 1561f263522aSJoseph Koshy 1562f263522aSJoseph Koshy /* 1563f263522aSJoseph Koshy * Process accumulated PC samples. 1564f263522aSJoseph Koshy * 1565f263522aSJoseph Koshy * This function is expected to be called by hardclock() for 1566f263522aSJoseph Koshy * each CPU that has accumulated PC samples. 1567f263522aSJoseph Koshy * 1568f263522aSJoseph Koshy * This function is to be executed on the CPU whose samples 1569f263522aSJoseph Koshy * are being processed. 1570f263522aSJoseph Koshy */ 1571f263522aSJoseph Koshy case PMC_FN_DO_SAMPLES: 1572f263522aSJoseph Koshy 1573f263522aSJoseph Koshy /* 1574f263522aSJoseph Koshy * Clear the cpu specific bit in the CPU mask before 1575f263522aSJoseph Koshy * do the rest of the processing. If the NMI handler 1576f263522aSJoseph Koshy * gets invoked after the "atomic_clear_int()" call 1577f263522aSJoseph Koshy * below but before "pmc_process_samples()" gets 1578f263522aSJoseph Koshy * around to processing the interrupt, then we will 1579f263522aSJoseph Koshy * come back here at the next hardclock() tick (and 1580f263522aSJoseph Koshy * may find nothing to do if "pmc_process_samples()" 1581f263522aSJoseph Koshy * had already processed the interrupt). We don't 1582f263522aSJoseph Koshy * lose the interrupt sample. 1583f263522aSJoseph Koshy */ 1584f263522aSJoseph Koshy atomic_clear_int(&pmc_cpumask, (1 << PCPU_GET(cpuid))); 1585f263522aSJoseph Koshy pmc_process_samples(PCPU_GET(cpuid)); 1586f263522aSJoseph Koshy break; 1587f263522aSJoseph Koshy 1588ebccf1e3SJoseph Koshy default: 1589342ed5d9SRuslan Ermilov #ifdef DEBUG 1590ebccf1e3SJoseph Koshy KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function)); 1591ebccf1e3SJoseph Koshy #endif 1592ebccf1e3SJoseph Koshy break; 1593ebccf1e3SJoseph Koshy 1594ebccf1e3SJoseph Koshy } 1595ebccf1e3SJoseph Koshy 1596ebccf1e3SJoseph Koshy return 0; 1597ebccf1e3SJoseph Koshy } 1598ebccf1e3SJoseph Koshy 1599ebccf1e3SJoseph Koshy /* 1600ebccf1e3SJoseph Koshy * allocate a 'struct pmc_owner' descriptor in the owner hash table. 1601ebccf1e3SJoseph Koshy */ 1602ebccf1e3SJoseph Koshy 1603ebccf1e3SJoseph Koshy static struct pmc_owner * 1604ebccf1e3SJoseph Koshy pmc_allocate_owner_descriptor(struct proc *p) 1605ebccf1e3SJoseph Koshy { 1606ebccf1e3SJoseph Koshy uint32_t hindex; 1607ebccf1e3SJoseph Koshy struct pmc_owner *po; 1608ebccf1e3SJoseph Koshy struct pmc_ownerhash *poh; 1609ebccf1e3SJoseph Koshy 1610ebccf1e3SJoseph Koshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1611ebccf1e3SJoseph Koshy poh = &pmc_ownerhash[hindex]; 1612ebccf1e3SJoseph Koshy 1613ebccf1e3SJoseph Koshy /* allocate space for N pointers and one descriptor struct */ 1614ebccf1e3SJoseph Koshy MALLOC(po, struct pmc_owner *, sizeof(struct pmc_owner), 1615f263522aSJoseph Koshy M_PMC, M_ZERO|M_WAITOK); 1616ebccf1e3SJoseph Koshy 1617f263522aSJoseph Koshy po->po_sscount = po->po_error = po->po_flags = 0; 1618f263522aSJoseph Koshy po->po_file = NULL; 1619ebccf1e3SJoseph Koshy po->po_owner = p; 1620f263522aSJoseph Koshy po->po_kthread = NULL; 1621ebccf1e3SJoseph Koshy LIST_INIT(&po->po_pmcs); 1622ebccf1e3SJoseph Koshy LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */ 1623ebccf1e3SJoseph Koshy 1624f263522aSJoseph Koshy TAILQ_INIT(&po->po_logbuffers); 1625f263522aSJoseph Koshy mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc", MTX_SPIN); 1626f263522aSJoseph Koshy 1627ebccf1e3SJoseph Koshy PMCDBG(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p", 1628ebccf1e3SJoseph Koshy p, p->p_pid, p->p_comm, po); 1629ebccf1e3SJoseph Koshy 1630ebccf1e3SJoseph Koshy return po; 1631ebccf1e3SJoseph Koshy } 1632ebccf1e3SJoseph Koshy 1633f263522aSJoseph Koshy static void 1634f263522aSJoseph Koshy pmc_destroy_owner_descriptor(struct pmc_owner *po) 1635f263522aSJoseph Koshy { 1636f263522aSJoseph Koshy 1637f263522aSJoseph Koshy PMCDBG(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)", 1638f263522aSJoseph Koshy po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm); 1639f263522aSJoseph Koshy 1640f263522aSJoseph Koshy mtx_destroy(&po->po_mtx); 1641f263522aSJoseph Koshy FREE(po, M_PMC); 1642f263522aSJoseph Koshy } 1643f263522aSJoseph Koshy 1644ebccf1e3SJoseph Koshy /* 1645ebccf1e3SJoseph Koshy * find the descriptor corresponding to process 'p', adding or removing it 1646ebccf1e3SJoseph Koshy * as specified by 'mode'. 1647ebccf1e3SJoseph Koshy */ 1648ebccf1e3SJoseph Koshy 1649ebccf1e3SJoseph Koshy static struct pmc_process * 1650ebccf1e3SJoseph Koshy pmc_find_process_descriptor(struct proc *p, uint32_t mode) 1651ebccf1e3SJoseph Koshy { 1652ebccf1e3SJoseph Koshy uint32_t hindex; 1653ebccf1e3SJoseph Koshy struct pmc_process *pp, *ppnew; 1654ebccf1e3SJoseph Koshy struct pmc_processhash *pph; 1655ebccf1e3SJoseph Koshy 1656ebccf1e3SJoseph Koshy hindex = PMC_HASH_PTR(p, pmc_processhashmask); 1657ebccf1e3SJoseph Koshy pph = &pmc_processhash[hindex]; 1658ebccf1e3SJoseph Koshy 1659ebccf1e3SJoseph Koshy ppnew = NULL; 1660ebccf1e3SJoseph Koshy 1661ebccf1e3SJoseph Koshy /* 1662ebccf1e3SJoseph Koshy * Pre-allocate memory in the FIND_ALLOCATE case since we 1663ebccf1e3SJoseph Koshy * cannot call malloc(9) once we hold a spin lock. 1664ebccf1e3SJoseph Koshy */ 1665ebccf1e3SJoseph Koshy 1666ebccf1e3SJoseph Koshy if (mode & PMC_FLAG_ALLOCATE) { 1667ebccf1e3SJoseph Koshy /* allocate additional space for 'n' pmc pointers */ 1668ebccf1e3SJoseph Koshy MALLOC(ppnew, struct pmc_process *, 1669ebccf1e3SJoseph Koshy sizeof(struct pmc_process) + md->pmd_npmc * 1670ebccf1e3SJoseph Koshy sizeof(struct pmc_targetstate), M_PMC, M_ZERO|M_WAITOK); 1671ebccf1e3SJoseph Koshy } 1672ebccf1e3SJoseph Koshy 1673ebccf1e3SJoseph Koshy mtx_lock_spin(&pmc_processhash_mtx); 1674ebccf1e3SJoseph Koshy LIST_FOREACH(pp, pph, pp_next) 1675ebccf1e3SJoseph Koshy if (pp->pp_proc == p) 1676ebccf1e3SJoseph Koshy break; 1677ebccf1e3SJoseph Koshy 1678ebccf1e3SJoseph Koshy if ((mode & PMC_FLAG_REMOVE) && pp != NULL) 1679ebccf1e3SJoseph Koshy LIST_REMOVE(pp, pp_next); 1680ebccf1e3SJoseph Koshy 1681ebccf1e3SJoseph Koshy if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL && 1682ebccf1e3SJoseph Koshy ppnew != NULL) { 1683ebccf1e3SJoseph Koshy ppnew->pp_proc = p; 1684ebccf1e3SJoseph Koshy LIST_INSERT_HEAD(pph, ppnew, pp_next); 1685ebccf1e3SJoseph Koshy pp = ppnew; 1686ebccf1e3SJoseph Koshy ppnew = NULL; 1687ebccf1e3SJoseph Koshy } 1688ebccf1e3SJoseph Koshy mtx_unlock_spin(&pmc_processhash_mtx); 1689ebccf1e3SJoseph Koshy 1690ebccf1e3SJoseph Koshy if (pp != NULL && ppnew != NULL) 1691ebccf1e3SJoseph Koshy FREE(ppnew, M_PMC); 1692ebccf1e3SJoseph Koshy 1693ebccf1e3SJoseph Koshy return pp; 1694ebccf1e3SJoseph Koshy } 1695ebccf1e3SJoseph Koshy 1696ebccf1e3SJoseph Koshy /* 1697ebccf1e3SJoseph Koshy * remove a process descriptor from the process hash table. 1698ebccf1e3SJoseph Koshy */ 1699ebccf1e3SJoseph Koshy 1700ebccf1e3SJoseph Koshy static void 1701ebccf1e3SJoseph Koshy pmc_remove_process_descriptor(struct pmc_process *pp) 1702ebccf1e3SJoseph Koshy { 1703ebccf1e3SJoseph Koshy KASSERT(pp->pp_refcnt == 0, 1704ebccf1e3SJoseph Koshy ("[pmc,%d] Removing process descriptor %p with count %d", 1705ebccf1e3SJoseph Koshy __LINE__, pp, pp->pp_refcnt)); 1706ebccf1e3SJoseph Koshy 1707ebccf1e3SJoseph Koshy mtx_lock_spin(&pmc_processhash_mtx); 1708ebccf1e3SJoseph Koshy LIST_REMOVE(pp, pp_next); 1709ebccf1e3SJoseph Koshy mtx_unlock_spin(&pmc_processhash_mtx); 1710ebccf1e3SJoseph Koshy } 1711ebccf1e3SJoseph Koshy 1712ebccf1e3SJoseph Koshy 1713ebccf1e3SJoseph Koshy /* 1714ebccf1e3SJoseph Koshy * find an owner descriptor corresponding to proc 'p' 1715ebccf1e3SJoseph Koshy */ 1716ebccf1e3SJoseph Koshy 1717ebccf1e3SJoseph Koshy static struct pmc_owner * 1718ebccf1e3SJoseph Koshy pmc_find_owner_descriptor(struct proc *p) 1719ebccf1e3SJoseph Koshy { 1720ebccf1e3SJoseph Koshy uint32_t hindex; 1721ebccf1e3SJoseph Koshy struct pmc_owner *po; 1722ebccf1e3SJoseph Koshy struct pmc_ownerhash *poh; 1723ebccf1e3SJoseph Koshy 1724ebccf1e3SJoseph Koshy hindex = PMC_HASH_PTR(p, pmc_ownerhashmask); 1725ebccf1e3SJoseph Koshy poh = &pmc_ownerhash[hindex]; 1726ebccf1e3SJoseph Koshy 1727ebccf1e3SJoseph Koshy po = NULL; 1728ebccf1e3SJoseph Koshy LIST_FOREACH(po, poh, po_next) 1729ebccf1e3SJoseph Koshy if (po->po_owner == p) 1730ebccf1e3SJoseph Koshy break; 1731ebccf1e3SJoseph Koshy 1732ebccf1e3SJoseph Koshy PMCDBG(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> " 1733ebccf1e3SJoseph Koshy "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po); 1734ebccf1e3SJoseph Koshy 1735ebccf1e3SJoseph Koshy return po; 1736ebccf1e3SJoseph Koshy } 1737ebccf1e3SJoseph Koshy 1738ebccf1e3SJoseph Koshy /* 1739ebccf1e3SJoseph Koshy * pmc_allocate_pmc_descriptor 1740ebccf1e3SJoseph Koshy * 1741ebccf1e3SJoseph Koshy * Allocate a pmc descriptor and initialize its 1742ebccf1e3SJoseph Koshy * fields. 1743ebccf1e3SJoseph Koshy */ 1744ebccf1e3SJoseph Koshy 1745ebccf1e3SJoseph Koshy static struct pmc * 1746ebccf1e3SJoseph Koshy pmc_allocate_pmc_descriptor(void) 1747ebccf1e3SJoseph Koshy { 1748ebccf1e3SJoseph Koshy struct pmc *pmc; 1749ebccf1e3SJoseph Koshy 1750ebccf1e3SJoseph Koshy MALLOC(pmc, struct pmc *, sizeof(struct pmc), M_PMC, M_ZERO|M_WAITOK); 1751ebccf1e3SJoseph Koshy 1752ebccf1e3SJoseph Koshy if (pmc != NULL) { 1753ebccf1e3SJoseph Koshy pmc->pm_owner = NULL; 1754ebccf1e3SJoseph Koshy LIST_INIT(&pmc->pm_targets); 1755ebccf1e3SJoseph Koshy } 1756ebccf1e3SJoseph Koshy 1757ebccf1e3SJoseph Koshy PMCDBG(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc); 1758ebccf1e3SJoseph Koshy 1759ebccf1e3SJoseph Koshy return pmc; 1760ebccf1e3SJoseph Koshy } 1761ebccf1e3SJoseph Koshy 1762ebccf1e3SJoseph Koshy /* 1763ebccf1e3SJoseph Koshy * Destroy a pmc descriptor. 1764ebccf1e3SJoseph Koshy */ 1765ebccf1e3SJoseph Koshy 1766ebccf1e3SJoseph Koshy static void 1767ebccf1e3SJoseph Koshy pmc_destroy_pmc_descriptor(struct pmc *pm) 1768ebccf1e3SJoseph Koshy { 1769ebccf1e3SJoseph Koshy (void) pm; 1770ebccf1e3SJoseph Koshy 1771342ed5d9SRuslan Ermilov #ifdef DEBUG 1772ebccf1e3SJoseph Koshy KASSERT(pm->pm_state == PMC_STATE_DELETED || 1773ebccf1e3SJoseph Koshy pm->pm_state == PMC_STATE_FREE, 1774ebccf1e3SJoseph Koshy ("[pmc,%d] destroying non-deleted PMC", __LINE__)); 1775ebccf1e3SJoseph Koshy KASSERT(LIST_EMPTY(&pm->pm_targets), 1776ebccf1e3SJoseph Koshy ("[pmc,%d] destroying pmc with targets", __LINE__)); 1777ebccf1e3SJoseph Koshy KASSERT(pm->pm_owner == NULL, 1778ebccf1e3SJoseph Koshy ("[pmc,%d] destroying pmc attached to an owner", __LINE__)); 1779ebccf1e3SJoseph Koshy KASSERT(pm->pm_runcount == 0, 1780ebccf1e3SJoseph Koshy ("[pmc,%d] pmc has non-zero run count %d", __LINE__, 1781ebccf1e3SJoseph Koshy pm->pm_runcount)); 1782ebccf1e3SJoseph Koshy #endif 1783ebccf1e3SJoseph Koshy } 1784ebccf1e3SJoseph Koshy 1785f263522aSJoseph Koshy static void 1786f263522aSJoseph Koshy pmc_wait_for_pmc_idle(struct pmc *pm) 1787f263522aSJoseph Koshy { 1788342ed5d9SRuslan Ermilov #ifdef DEBUG 1789f263522aSJoseph Koshy volatile int maxloop; 1790f263522aSJoseph Koshy 1791f263522aSJoseph Koshy maxloop = 100 * mp_ncpus; 1792f263522aSJoseph Koshy #endif 1793f263522aSJoseph Koshy 1794f263522aSJoseph Koshy /* 1795f263522aSJoseph Koshy * Loop (with a forced context switch) till the PMC's runcount 1796f263522aSJoseph Koshy * comes down to zero. 1797f263522aSJoseph Koshy */ 1798f263522aSJoseph Koshy while (atomic_load_acq_32(&pm->pm_runcount) > 0) { 1799342ed5d9SRuslan Ermilov #ifdef DEBUG 1800f263522aSJoseph Koshy maxloop--; 1801f263522aSJoseph Koshy KASSERT(maxloop > 0, 1802f263522aSJoseph Koshy ("[pmc,%d] (ri%d, rc%d) waiting too long for " 1803f263522aSJoseph Koshy "pmc to be free", __LINE__, 1804f263522aSJoseph Koshy PMC_TO_ROWINDEX(pm), pm->pm_runcount)); 1805f263522aSJoseph Koshy #endif 1806f263522aSJoseph Koshy pmc_force_context_switch(); 1807f263522aSJoseph Koshy } 1808f263522aSJoseph Koshy } 1809f263522aSJoseph Koshy 1810ebccf1e3SJoseph Koshy /* 1811ebccf1e3SJoseph Koshy * This function does the following things: 1812ebccf1e3SJoseph Koshy * 1813ebccf1e3SJoseph Koshy * - detaches the PMC from hardware 1814ebccf1e3SJoseph Koshy * - unlinks all target threads that were attached to it 1815ebccf1e3SJoseph Koshy * - removes the PMC from its owner's list 1816ebccf1e3SJoseph Koshy * - destroy's the PMC private mutex 1817ebccf1e3SJoseph Koshy * 1818ebccf1e3SJoseph Koshy * Once this function completes, the given pmc pointer can be safely 1819ebccf1e3SJoseph Koshy * FREE'd by the caller. 1820ebccf1e3SJoseph Koshy */ 1821ebccf1e3SJoseph Koshy 1822ebccf1e3SJoseph Koshy static void 1823ebccf1e3SJoseph Koshy pmc_release_pmc_descriptor(struct pmc *pm) 1824ebccf1e3SJoseph Koshy { 1825ebccf1e3SJoseph Koshy u_int ri, cpu; 1826c5153e19SJoseph Koshy enum pmc_mode mode; 1827ebccf1e3SJoseph Koshy struct pmc_hw *phw; 1828f263522aSJoseph Koshy struct pmc_owner *po; 1829ebccf1e3SJoseph Koshy struct pmc_process *pp; 1830ebccf1e3SJoseph Koshy struct pmc_target *ptgt, *tmp; 1831ebccf1e3SJoseph Koshy struct pmc_binding pb; 1832ebccf1e3SJoseph Koshy 1833ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1834ebccf1e3SJoseph Koshy 1835ebccf1e3SJoseph Koshy KASSERT(pm, ("[pmc,%d] null pmc", __LINE__)); 1836ebccf1e3SJoseph Koshy 1837c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 1838c5153e19SJoseph Koshy mode = PMC_TO_MODE(pm); 1839ebccf1e3SJoseph Koshy 1840ebccf1e3SJoseph Koshy PMCDBG(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri, 1841c5153e19SJoseph Koshy mode); 1842ebccf1e3SJoseph Koshy 1843ebccf1e3SJoseph Koshy /* 1844ebccf1e3SJoseph Koshy * First, we take the PMC off hardware. 1845ebccf1e3SJoseph Koshy */ 1846869f4a8bSWarner Losh cpu = 0; 1847c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) { 1848ebccf1e3SJoseph Koshy 1849ebccf1e3SJoseph Koshy /* 1850ebccf1e3SJoseph Koshy * A system mode PMC runs on a specific CPU. Switch 1851ebccf1e3SJoseph Koshy * to this CPU and turn hardware off. 1852ebccf1e3SJoseph Koshy */ 1853ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 1854ebccf1e3SJoseph Koshy 1855c5153e19SJoseph Koshy cpu = PMC_TO_CPU(pm); 1856ebccf1e3SJoseph Koshy 1857ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 1858ebccf1e3SJoseph Koshy 1859f263522aSJoseph Koshy /* switch off non-stalled CPUs */ 1860f263522aSJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING && 1861fbf1556dSJoseph Koshy pm->pm_stalled == 0) { 1862f263522aSJoseph Koshy 1863ebccf1e3SJoseph Koshy phw = pmc_pcpu[cpu]->pc_hwpmcs[ri]; 1864ebccf1e3SJoseph Koshy 1865ebccf1e3SJoseph Koshy KASSERT(phw->phw_pmc == pm, 1866ebccf1e3SJoseph Koshy ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)", 1867ebccf1e3SJoseph Koshy __LINE__, ri, phw->phw_pmc, pm)); 1868ebccf1e3SJoseph Koshy PMCDBG(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri); 1869ebccf1e3SJoseph Koshy 1870ebccf1e3SJoseph Koshy critical_enter(); 1871ebccf1e3SJoseph Koshy md->pmd_stop_pmc(cpu, ri); 1872ebccf1e3SJoseph Koshy critical_exit(); 1873ebccf1e3SJoseph Koshy } 1874ebccf1e3SJoseph Koshy 1875ebccf1e3SJoseph Koshy PMCDBG(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri); 1876ebccf1e3SJoseph Koshy 1877ebccf1e3SJoseph Koshy critical_enter(); 1878ebccf1e3SJoseph Koshy md->pmd_config_pmc(cpu, ri, NULL); 1879ebccf1e3SJoseph Koshy critical_exit(); 1880ebccf1e3SJoseph Koshy 1881f263522aSJoseph Koshy /* adjust the global and process count of SS mode PMCs */ 1882f263522aSJoseph Koshy if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) { 1883f263522aSJoseph Koshy po = pm->pm_owner; 1884f263522aSJoseph Koshy po->po_sscount--; 1885f263522aSJoseph Koshy if (po->po_sscount == 0) { 1886f263522aSJoseph Koshy atomic_subtract_rel_int(&pmc_ss_count, 1); 1887f263522aSJoseph Koshy LIST_REMOVE(po, po_ssnext); 1888f263522aSJoseph Koshy } 1889f263522aSJoseph Koshy } 1890f263522aSJoseph Koshy 1891ebccf1e3SJoseph Koshy pm->pm_state = PMC_STATE_DELETED; 1892ebccf1e3SJoseph Koshy 1893ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 1894ebccf1e3SJoseph Koshy 1895f263522aSJoseph Koshy /* 1896f263522aSJoseph Koshy * We could have references to this PMC structure in 1897f263522aSJoseph Koshy * the per-cpu sample queues. Wait for the queue to 1898f263522aSJoseph Koshy * drain. 1899f263522aSJoseph Koshy */ 1900f263522aSJoseph Koshy pmc_wait_for_pmc_idle(pm); 1901f263522aSJoseph Koshy 1902c5153e19SJoseph Koshy } else if (PMC_IS_VIRTUAL_MODE(mode)) { 1903ebccf1e3SJoseph Koshy 1904ebccf1e3SJoseph Koshy /* 1905ebccf1e3SJoseph Koshy * A virtual PMC could be running on multiple CPUs at 1906ebccf1e3SJoseph Koshy * a given instant. 1907ebccf1e3SJoseph Koshy * 1908ebccf1e3SJoseph Koshy * By marking its state as DELETED, we ensure that 1909ebccf1e3SJoseph Koshy * this PMC is never further scheduled on hardware. 1910ebccf1e3SJoseph Koshy * 1911ebccf1e3SJoseph Koshy * Then we wait till all CPUs are done with this PMC. 1912ebccf1e3SJoseph Koshy */ 1913ebccf1e3SJoseph Koshy pm->pm_state = PMC_STATE_DELETED; 1914ebccf1e3SJoseph Koshy 1915ebccf1e3SJoseph Koshy 1916f263522aSJoseph Koshy /* Wait for the PMCs runcount to come to zero. */ 1917f263522aSJoseph Koshy pmc_wait_for_pmc_idle(pm); 1918ebccf1e3SJoseph Koshy 1919ebccf1e3SJoseph Koshy /* 1920ebccf1e3SJoseph Koshy * At this point the PMC is off all CPUs and cannot be 1921ebccf1e3SJoseph Koshy * freshly scheduled onto a CPU. It is now safe to 1922ebccf1e3SJoseph Koshy * unlink all targets from this PMC. If a 1923ebccf1e3SJoseph Koshy * process-record's refcount falls to zero, we remove 1924ebccf1e3SJoseph Koshy * it from the hash table. The module-wide SX lock 1925ebccf1e3SJoseph Koshy * protects us from races. 1926ebccf1e3SJoseph Koshy */ 1927ebccf1e3SJoseph Koshy LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) { 1928ebccf1e3SJoseph Koshy pp = ptgt->pt_process; 1929ebccf1e3SJoseph Koshy pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */ 1930ebccf1e3SJoseph Koshy 1931ebccf1e3SJoseph Koshy PMCDBG(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt); 1932ebccf1e3SJoseph Koshy 1933ebccf1e3SJoseph Koshy /* 1934ebccf1e3SJoseph Koshy * If the target process record shows that no 1935ebccf1e3SJoseph Koshy * PMCs are attached to it, reclaim its space. 1936ebccf1e3SJoseph Koshy */ 1937ebccf1e3SJoseph Koshy 1938ebccf1e3SJoseph Koshy if (pp->pp_refcnt == 0) { 1939ebccf1e3SJoseph Koshy pmc_remove_process_descriptor(pp); 1940ebccf1e3SJoseph Koshy FREE(pp, M_PMC); 1941ebccf1e3SJoseph Koshy } 1942ebccf1e3SJoseph Koshy } 1943ebccf1e3SJoseph Koshy 1944ebccf1e3SJoseph Koshy cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */ 1945ebccf1e3SJoseph Koshy 1946ebccf1e3SJoseph Koshy } 1947ebccf1e3SJoseph Koshy 1948ebccf1e3SJoseph Koshy /* 1949ebccf1e3SJoseph Koshy * Release any MD resources 1950ebccf1e3SJoseph Koshy */ 1951ebccf1e3SJoseph Koshy 1952ebccf1e3SJoseph Koshy (void) md->pmd_release_pmc(cpu, ri, pm); 1953ebccf1e3SJoseph Koshy 1954ebccf1e3SJoseph Koshy /* 1955ebccf1e3SJoseph Koshy * Update row disposition 1956ebccf1e3SJoseph Koshy */ 1957ebccf1e3SJoseph Koshy 1958c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) 1959ebccf1e3SJoseph Koshy PMC_UNMARK_ROW_STANDALONE(ri); 1960ebccf1e3SJoseph Koshy else 1961ebccf1e3SJoseph Koshy PMC_UNMARK_ROW_THREAD(ri); 1962ebccf1e3SJoseph Koshy 1963ebccf1e3SJoseph Koshy /* unlink from the owner's list */ 1964f263522aSJoseph Koshy if (pm->pm_owner) { 1965f263522aSJoseph Koshy LIST_REMOVE(pm, pm_next); 1966f263522aSJoseph Koshy pm->pm_owner = NULL; 1967f263522aSJoseph Koshy } 1968ebccf1e3SJoseph Koshy 1969ebccf1e3SJoseph Koshy pmc_destroy_pmc_descriptor(pm); 1970ebccf1e3SJoseph Koshy } 1971ebccf1e3SJoseph Koshy 1972ebccf1e3SJoseph Koshy /* 1973ebccf1e3SJoseph Koshy * Register an owner and a pmc. 1974ebccf1e3SJoseph Koshy */ 1975ebccf1e3SJoseph Koshy 1976ebccf1e3SJoseph Koshy static int 1977ebccf1e3SJoseph Koshy pmc_register_owner(struct proc *p, struct pmc *pmc) 1978ebccf1e3SJoseph Koshy { 1979ebccf1e3SJoseph Koshy struct pmc_owner *po; 1980ebccf1e3SJoseph Koshy 1981ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 1982ebccf1e3SJoseph Koshy 1983c5153e19SJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 1984f263522aSJoseph Koshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) 1985ebccf1e3SJoseph Koshy return ENOMEM; 1986ebccf1e3SJoseph Koshy 1987ebccf1e3SJoseph Koshy KASSERT(pmc->pm_owner == NULL, 1988ebccf1e3SJoseph Koshy ("[pmc,%d] attempting to own an initialized PMC", __LINE__)); 1989ebccf1e3SJoseph Koshy pmc->pm_owner = po; 1990ebccf1e3SJoseph Koshy 1991f263522aSJoseph Koshy LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next); 1992ebccf1e3SJoseph Koshy 1993ebccf1e3SJoseph Koshy PROC_LOCK(p); 1994ebccf1e3SJoseph Koshy p->p_flag |= P_HWPMC; 1995ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 1996ebccf1e3SJoseph Koshy 1997f263522aSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 1998f263522aSJoseph Koshy pmclog_process_pmcallocate(pmc); 1999f263522aSJoseph Koshy 2000f263522aSJoseph Koshy PMCDBG(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p", 2001f263522aSJoseph Koshy po, pmc); 2002ebccf1e3SJoseph Koshy 2003ebccf1e3SJoseph Koshy return 0; 2004ebccf1e3SJoseph Koshy } 2005ebccf1e3SJoseph Koshy 2006ebccf1e3SJoseph Koshy /* 2007ebccf1e3SJoseph Koshy * Return the current row disposition: 2008ebccf1e3SJoseph Koshy * == 0 => FREE 2009ebccf1e3SJoseph Koshy * > 0 => PROCESS MODE 2010ebccf1e3SJoseph Koshy * < 0 => SYSTEM MODE 2011ebccf1e3SJoseph Koshy */ 2012ebccf1e3SJoseph Koshy 2013ebccf1e3SJoseph Koshy int 2014ebccf1e3SJoseph Koshy pmc_getrowdisp(int ri) 2015ebccf1e3SJoseph Koshy { 2016ebccf1e3SJoseph Koshy return pmc_pmcdisp[ri]; 2017ebccf1e3SJoseph Koshy } 2018ebccf1e3SJoseph Koshy 2019ebccf1e3SJoseph Koshy /* 2020ebccf1e3SJoseph Koshy * Check if a PMC at row index 'ri' can be allocated to the current 2021ebccf1e3SJoseph Koshy * process. 2022ebccf1e3SJoseph Koshy * 2023ebccf1e3SJoseph Koshy * Allocation can fail if: 2024ebccf1e3SJoseph Koshy * - the current process is already being profiled by a PMC at index 'ri', 2025ebccf1e3SJoseph Koshy * attached to it via OP_PMCATTACH. 2026ebccf1e3SJoseph Koshy * - the current process has already allocated a PMC at index 'ri' 2027ebccf1e3SJoseph Koshy * via OP_ALLOCATE. 2028ebccf1e3SJoseph Koshy */ 2029ebccf1e3SJoseph Koshy 2030ebccf1e3SJoseph Koshy static int 2031c5153e19SJoseph Koshy pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu) 2032ebccf1e3SJoseph Koshy { 2033c5153e19SJoseph Koshy enum pmc_mode mode; 2034c5153e19SJoseph Koshy struct pmc *pm; 2035ebccf1e3SJoseph Koshy struct pmc_owner *po; 2036ebccf1e3SJoseph Koshy struct pmc_process *pp; 2037ebccf1e3SJoseph Koshy 2038c5153e19SJoseph Koshy PMCDBG(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d " 2039c5153e19SJoseph Koshy "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu); 2040ebccf1e3SJoseph Koshy 2041c5153e19SJoseph Koshy /* 2042c5153e19SJoseph Koshy * We shouldn't have already allocated a process-mode PMC at 2043c5153e19SJoseph Koshy * row index 'ri'. 2044c5153e19SJoseph Koshy * 2045c5153e19SJoseph Koshy * We shouldn't have allocated a system-wide PMC on the same 2046c5153e19SJoseph Koshy * CPU and same RI. 2047c5153e19SJoseph Koshy */ 2048ebccf1e3SJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) != NULL) 2049f263522aSJoseph Koshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) { 2050c5153e19SJoseph Koshy if (PMC_TO_ROWINDEX(pm) == ri) { 2051c5153e19SJoseph Koshy mode = PMC_TO_MODE(pm); 2052c5153e19SJoseph Koshy if (PMC_IS_VIRTUAL_MODE(mode)) 2053ebccf1e3SJoseph Koshy return EEXIST; 2054c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode) && 2055c5153e19SJoseph Koshy (int) PMC_TO_CPU(pm) == cpu) 2056c5153e19SJoseph Koshy return EEXIST; 2057c5153e19SJoseph Koshy } 2058c5153e19SJoseph Koshy } 2059ebccf1e3SJoseph Koshy 2060c5153e19SJoseph Koshy /* 2061c5153e19SJoseph Koshy * We also shouldn't be the target of any PMC at this index 2062c5153e19SJoseph Koshy * since otherwise a PMC_ATTACH to ourselves will fail. 2063c5153e19SJoseph Koshy */ 2064ebccf1e3SJoseph Koshy if ((pp = pmc_find_process_descriptor(p, 0)) != NULL) 2065ebccf1e3SJoseph Koshy if (pp->pp_pmcs[ri].pp_pmc) 2066ebccf1e3SJoseph Koshy return EEXIST; 2067ebccf1e3SJoseph Koshy 2068ebccf1e3SJoseph Koshy PMCDBG(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok", 2069ebccf1e3SJoseph Koshy p, p->p_pid, p->p_comm, ri); 2070ebccf1e3SJoseph Koshy 2071ebccf1e3SJoseph Koshy return 0; 2072ebccf1e3SJoseph Koshy } 2073ebccf1e3SJoseph Koshy 2074ebccf1e3SJoseph Koshy /* 2075ebccf1e3SJoseph Koshy * Check if a given PMC at row index 'ri' can be currently used in 2076ebccf1e3SJoseph Koshy * mode 'mode'. 2077ebccf1e3SJoseph Koshy */ 2078ebccf1e3SJoseph Koshy 2079ebccf1e3SJoseph Koshy static int 2080ebccf1e3SJoseph Koshy pmc_can_allocate_row(int ri, enum pmc_mode mode) 2081ebccf1e3SJoseph Koshy { 2082ebccf1e3SJoseph Koshy enum pmc_disp disp; 2083ebccf1e3SJoseph Koshy 2084ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 2085ebccf1e3SJoseph Koshy 2086ebccf1e3SJoseph Koshy PMCDBG(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode); 2087ebccf1e3SJoseph Koshy 2088ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) 2089ebccf1e3SJoseph Koshy disp = PMC_DISP_STANDALONE; 2090ebccf1e3SJoseph Koshy else 2091ebccf1e3SJoseph Koshy disp = PMC_DISP_THREAD; 2092ebccf1e3SJoseph Koshy 2093ebccf1e3SJoseph Koshy /* 2094ebccf1e3SJoseph Koshy * check disposition for PMC row 'ri': 2095ebccf1e3SJoseph Koshy * 2096ebccf1e3SJoseph Koshy * Expected disposition Row-disposition Result 2097ebccf1e3SJoseph Koshy * 2098ebccf1e3SJoseph Koshy * STANDALONE STANDALONE or FREE proceed 2099ebccf1e3SJoseph Koshy * STANDALONE THREAD fail 2100ebccf1e3SJoseph Koshy * THREAD THREAD or FREE proceed 2101ebccf1e3SJoseph Koshy * THREAD STANDALONE fail 2102ebccf1e3SJoseph Koshy */ 2103ebccf1e3SJoseph Koshy 2104ebccf1e3SJoseph Koshy if (!PMC_ROW_DISP_IS_FREE(ri) && 2105ebccf1e3SJoseph Koshy !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) && 2106ebccf1e3SJoseph Koshy !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri))) 2107ebccf1e3SJoseph Koshy return EBUSY; 2108ebccf1e3SJoseph Koshy 2109ebccf1e3SJoseph Koshy /* 2110ebccf1e3SJoseph Koshy * All OK 2111ebccf1e3SJoseph Koshy */ 2112ebccf1e3SJoseph Koshy 2113ebccf1e3SJoseph Koshy PMCDBG(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode); 2114ebccf1e3SJoseph Koshy 2115ebccf1e3SJoseph Koshy return 0; 2116ebccf1e3SJoseph Koshy 2117ebccf1e3SJoseph Koshy } 2118ebccf1e3SJoseph Koshy 2119ebccf1e3SJoseph Koshy /* 2120c5153e19SJoseph Koshy * Find a PMC descriptor with user handle 'pmcid' for thread 'td'. 2121ebccf1e3SJoseph Koshy */ 2122ebccf1e3SJoseph Koshy 2123ebccf1e3SJoseph Koshy static struct pmc * 2124ebccf1e3SJoseph Koshy pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid) 2125ebccf1e3SJoseph Koshy { 2126f263522aSJoseph Koshy struct pmc *pm; 2127ebccf1e3SJoseph Koshy 2128c5153e19SJoseph Koshy KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc, 2129c5153e19SJoseph Koshy ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__, 2130c5153e19SJoseph Koshy PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc)); 2131ebccf1e3SJoseph Koshy 2132f263522aSJoseph Koshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2133f263522aSJoseph Koshy if (pm->pm_id == pmcid) 2134f263522aSJoseph Koshy return pm; 2135ebccf1e3SJoseph Koshy 2136ebccf1e3SJoseph Koshy return NULL; 2137ebccf1e3SJoseph Koshy } 2138ebccf1e3SJoseph Koshy 2139ebccf1e3SJoseph Koshy static int 2140ebccf1e3SJoseph Koshy pmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc) 2141ebccf1e3SJoseph Koshy { 2142ebccf1e3SJoseph Koshy 2143ebccf1e3SJoseph Koshy struct pmc *pm; 2144ebccf1e3SJoseph Koshy struct pmc_owner *po; 2145ebccf1e3SJoseph Koshy 2146ebccf1e3SJoseph Koshy PMCDBG(PMC,FND,1, "find-pmc id=%d", pmcid); 2147ebccf1e3SJoseph Koshy 2148ebccf1e3SJoseph Koshy if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) 2149ebccf1e3SJoseph Koshy return ESRCH; 2150ebccf1e3SJoseph Koshy 2151ebccf1e3SJoseph Koshy if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL) 2152ebccf1e3SJoseph Koshy return EINVAL; 2153ebccf1e3SJoseph Koshy 2154ebccf1e3SJoseph Koshy PMCDBG(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm); 2155ebccf1e3SJoseph Koshy 2156ebccf1e3SJoseph Koshy *pmc = pm; 2157ebccf1e3SJoseph Koshy return 0; 2158ebccf1e3SJoseph Koshy } 2159ebccf1e3SJoseph Koshy 2160ebccf1e3SJoseph Koshy /* 2161ebccf1e3SJoseph Koshy * Start a PMC. 2162ebccf1e3SJoseph Koshy */ 2163ebccf1e3SJoseph Koshy 2164ebccf1e3SJoseph Koshy static int 2165ebccf1e3SJoseph Koshy pmc_start(struct pmc *pm) 2166ebccf1e3SJoseph Koshy { 2167ebccf1e3SJoseph Koshy int error, cpu, ri; 2168c5153e19SJoseph Koshy enum pmc_mode mode; 2169f263522aSJoseph Koshy struct pmc_owner *po; 2170ebccf1e3SJoseph Koshy struct pmc_binding pb; 2171ebccf1e3SJoseph Koshy 2172ebccf1e3SJoseph Koshy KASSERT(pm != NULL, 2173ebccf1e3SJoseph Koshy ("[pmc,%d] null pm", __LINE__)); 2174ebccf1e3SJoseph Koshy 2175c5153e19SJoseph Koshy mode = PMC_TO_MODE(pm); 2176c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 2177c5153e19SJoseph Koshy error = 0; 2178c5153e19SJoseph Koshy 2179c5153e19SJoseph Koshy PMCDBG(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri); 2180ebccf1e3SJoseph Koshy 2181f263522aSJoseph Koshy po = pm->pm_owner; 2182ebccf1e3SJoseph Koshy 2183c5153e19SJoseph Koshy if (PMC_IS_VIRTUAL_MODE(mode)) { 2184ebccf1e3SJoseph Koshy 2185ebccf1e3SJoseph Koshy /* 2186f263522aSJoseph Koshy * If a PMCATTACH has never been done on this PMC, 2187f263522aSJoseph Koshy * attach it to its owner process. 2188ebccf1e3SJoseph Koshy */ 2189ebccf1e3SJoseph Koshy 2190ebccf1e3SJoseph Koshy if (LIST_EMPTY(&pm->pm_targets)) 2191f263522aSJoseph Koshy error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH : 2192f263522aSJoseph Koshy pmc_attach_process(po->po_owner, pm); 2193f263522aSJoseph Koshy 2194f263522aSJoseph Koshy /* 2195f263522aSJoseph Koshy * Disallow PMCSTART if a logfile is required but has not 2196f263522aSJoseph Koshy * been configured yet. 2197f263522aSJoseph Koshy */ 2198f263522aSJoseph Koshy 2199f263522aSJoseph Koshy if (error == 0 && (pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2200f263522aSJoseph Koshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2201f263522aSJoseph Koshy error = EDOOFUS; 2202ebccf1e3SJoseph Koshy 2203c5153e19SJoseph Koshy /* 2204c5153e19SJoseph Koshy * If the PMC is attached to its owner, then force a context 2205c5153e19SJoseph Koshy * switch to ensure that the MD state gets set correctly. 2206c5153e19SJoseph Koshy */ 2207ebccf1e3SJoseph Koshy 2208f263522aSJoseph Koshy if (error == 0) { 2209f263522aSJoseph Koshy pm->pm_state = PMC_STATE_RUNNING; 2210f263522aSJoseph Koshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) 2211f263522aSJoseph Koshy pmc_force_context_switch(); 2212f263522aSJoseph Koshy } 2213ebccf1e3SJoseph Koshy 2214c5153e19SJoseph Koshy return error; 2215f263522aSJoseph Koshy } 2216ebccf1e3SJoseph Koshy 2217f263522aSJoseph Koshy 2218f263522aSJoseph Koshy /* 2219f263522aSJoseph Koshy * A system-wide PMC. 2220f263522aSJoseph Koshy */ 2221f263522aSJoseph Koshy 2222f263522aSJoseph Koshy if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) && 2223f263522aSJoseph Koshy (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 2224f263522aSJoseph Koshy return EDOOFUS; /* programming error */ 2225f263522aSJoseph Koshy 2226f263522aSJoseph Koshy /* 2227f263522aSJoseph Koshy * Add the owner to the global list if this is a system-wide 2228f263522aSJoseph Koshy * sampling PMC. 2229f263522aSJoseph Koshy */ 2230f263522aSJoseph Koshy 2231f263522aSJoseph Koshy if (mode == PMC_MODE_SS) { 2232f263522aSJoseph Koshy if (po->po_sscount == 0) { 2233f263522aSJoseph Koshy LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext); 2234f263522aSJoseph Koshy atomic_add_rel_int(&pmc_ss_count, 1); 2235f263522aSJoseph Koshy PMCDBG(PMC,OPS,1, "po=%p in global list", po); 2236f263522aSJoseph Koshy } 2237f263522aSJoseph Koshy po->po_sscount++; 2238ebccf1e3SJoseph Koshy } 2239ebccf1e3SJoseph Koshy 2240ebccf1e3SJoseph Koshy /* 2241f263522aSJoseph Koshy * Move to the CPU associated with this 2242ebccf1e3SJoseph Koshy * PMC, and start the hardware. 2243ebccf1e3SJoseph Koshy */ 2244ebccf1e3SJoseph Koshy 2245ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 2246ebccf1e3SJoseph Koshy 2247c5153e19SJoseph Koshy cpu = PMC_TO_CPU(pm); 2248ebccf1e3SJoseph Koshy 2249ebccf1e3SJoseph Koshy if (pmc_cpu_is_disabled(cpu)) 2250ebccf1e3SJoseph Koshy return ENXIO; 2251ebccf1e3SJoseph Koshy 2252ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 2253ebccf1e3SJoseph Koshy 2254ebccf1e3SJoseph Koshy /* 2255ebccf1e3SJoseph Koshy * global PMCs are configured at allocation time 2256ebccf1e3SJoseph Koshy * so write out the initial value and start the PMC. 2257ebccf1e3SJoseph Koshy */ 2258ebccf1e3SJoseph Koshy 2259f263522aSJoseph Koshy pm->pm_state = PMC_STATE_RUNNING; 2260f263522aSJoseph Koshy 2261c5153e19SJoseph Koshy critical_enter(); 2262ebccf1e3SJoseph Koshy if ((error = md->pmd_write_pmc(cpu, ri, 2263c5153e19SJoseph Koshy PMC_IS_SAMPLING_MODE(mode) ? 2264ebccf1e3SJoseph Koshy pm->pm_sc.pm_reloadcount : 2265ebccf1e3SJoseph Koshy pm->pm_sc.pm_initial)) == 0) 2266ebccf1e3SJoseph Koshy error = md->pmd_start_pmc(cpu, ri); 2267c5153e19SJoseph Koshy critical_exit(); 2268ebccf1e3SJoseph Koshy 2269ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 2270ebccf1e3SJoseph Koshy 2271ebccf1e3SJoseph Koshy return error; 2272ebccf1e3SJoseph Koshy } 2273ebccf1e3SJoseph Koshy 2274ebccf1e3SJoseph Koshy /* 2275ebccf1e3SJoseph Koshy * Stop a PMC. 2276ebccf1e3SJoseph Koshy */ 2277ebccf1e3SJoseph Koshy 2278ebccf1e3SJoseph Koshy static int 2279ebccf1e3SJoseph Koshy pmc_stop(struct pmc *pm) 2280ebccf1e3SJoseph Koshy { 2281c5153e19SJoseph Koshy int cpu, error, ri; 2282f263522aSJoseph Koshy struct pmc_owner *po; 2283ebccf1e3SJoseph Koshy struct pmc_binding pb; 2284ebccf1e3SJoseph Koshy 2285ebccf1e3SJoseph Koshy KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__)); 2286ebccf1e3SJoseph Koshy 2287c5153e19SJoseph Koshy PMCDBG(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm, 2288c5153e19SJoseph Koshy PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm)); 2289ebccf1e3SJoseph Koshy 2290ebccf1e3SJoseph Koshy pm->pm_state = PMC_STATE_STOPPED; 2291ebccf1e3SJoseph Koshy 2292ebccf1e3SJoseph Koshy /* 2293ebccf1e3SJoseph Koshy * If the PMC is a virtual mode one, changing the state to 2294ebccf1e3SJoseph Koshy * non-RUNNING is enough to ensure that the PMC never gets 2295ebccf1e3SJoseph Koshy * scheduled. 2296ebccf1e3SJoseph Koshy * 2297ebccf1e3SJoseph Koshy * If this PMC is current running on a CPU, then it will 2298ebccf1e3SJoseph Koshy * handled correctly at the time its target process is context 2299ebccf1e3SJoseph Koshy * switched out. 2300ebccf1e3SJoseph Koshy */ 2301ebccf1e3SJoseph Koshy 2302c5153e19SJoseph Koshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 2303ebccf1e3SJoseph Koshy return 0; 2304ebccf1e3SJoseph Koshy 2305ebccf1e3SJoseph Koshy /* 2306ebccf1e3SJoseph Koshy * A system-mode PMC. Move to the CPU associated with 2307ebccf1e3SJoseph Koshy * this PMC, and stop the hardware. We update the 2308ebccf1e3SJoseph Koshy * 'initial count' so that a subsequent PMCSTART will 2309ebccf1e3SJoseph Koshy * resume counting from the current hardware count. 2310ebccf1e3SJoseph Koshy */ 2311ebccf1e3SJoseph Koshy 2312ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 2313ebccf1e3SJoseph Koshy 2314c5153e19SJoseph Koshy cpu = PMC_TO_CPU(pm); 2315c5153e19SJoseph Koshy 2316c5153e19SJoseph Koshy KASSERT(cpu >= 0 && cpu < mp_ncpus, 2317c5153e19SJoseph Koshy ("[pmc,%d] illegal cpu=%d", __LINE__, cpu)); 2318ebccf1e3SJoseph Koshy 2319ebccf1e3SJoseph Koshy if (pmc_cpu_is_disabled(cpu)) 2320ebccf1e3SJoseph Koshy return ENXIO; 2321ebccf1e3SJoseph Koshy 2322ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 2323ebccf1e3SJoseph Koshy 2324c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 2325c5153e19SJoseph Koshy 2326c5153e19SJoseph Koshy critical_enter(); 2327c5153e19SJoseph Koshy if ((error = md->pmd_stop_pmc(cpu, ri)) == 0) 2328c5153e19SJoseph Koshy error = md->pmd_read_pmc(cpu, ri, &pm->pm_sc.pm_initial); 2329c5153e19SJoseph Koshy critical_exit(); 2330ebccf1e3SJoseph Koshy 2331ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 2332ebccf1e3SJoseph Koshy 2333f263522aSJoseph Koshy po = pm->pm_owner; 2334f263522aSJoseph Koshy 2335f263522aSJoseph Koshy /* remove this owner from the global list of SS PMC owners */ 2336f263522aSJoseph Koshy if (PMC_TO_MODE(pm) == PMC_MODE_SS) { 2337f263522aSJoseph Koshy po->po_sscount--; 2338f263522aSJoseph Koshy if (po->po_sscount == 0) { 2339f263522aSJoseph Koshy atomic_subtract_rel_int(&pmc_ss_count, 1); 2340f263522aSJoseph Koshy LIST_REMOVE(po, po_ssnext); 2341f263522aSJoseph Koshy PMCDBG(PMC,OPS,2,"po=%p removed from global list", po); 2342f263522aSJoseph Koshy } 2343f263522aSJoseph Koshy } 2344f263522aSJoseph Koshy 2345ebccf1e3SJoseph Koshy return error; 2346ebccf1e3SJoseph Koshy } 2347ebccf1e3SJoseph Koshy 2348ebccf1e3SJoseph Koshy 2349342ed5d9SRuslan Ermilov #ifdef DEBUG 2350ebccf1e3SJoseph Koshy static const char *pmc_op_to_name[] = { 2351ebccf1e3SJoseph Koshy #undef __PMC_OP 2352ebccf1e3SJoseph Koshy #define __PMC_OP(N, D) #N , 2353ebccf1e3SJoseph Koshy __PMC_OPS() 2354ebccf1e3SJoseph Koshy NULL 2355ebccf1e3SJoseph Koshy }; 2356ebccf1e3SJoseph Koshy #endif 2357ebccf1e3SJoseph Koshy 2358ebccf1e3SJoseph Koshy /* 2359ebccf1e3SJoseph Koshy * The syscall interface 2360ebccf1e3SJoseph Koshy */ 2361ebccf1e3SJoseph Koshy 2362ebccf1e3SJoseph Koshy #define PMC_GET_SX_XLOCK(...) do { \ 2363ebccf1e3SJoseph Koshy sx_xlock(&pmc_sx); \ 2364ebccf1e3SJoseph Koshy if (pmc_hook == NULL) { \ 2365ebccf1e3SJoseph Koshy sx_xunlock(&pmc_sx); \ 2366ebccf1e3SJoseph Koshy return __VA_ARGS__; \ 2367ebccf1e3SJoseph Koshy } \ 2368ebccf1e3SJoseph Koshy } while (0) 2369ebccf1e3SJoseph Koshy 2370ebccf1e3SJoseph Koshy #define PMC_DOWNGRADE_SX() do { \ 2371ebccf1e3SJoseph Koshy sx_downgrade(&pmc_sx); \ 2372ebccf1e3SJoseph Koshy is_sx_downgraded = 1; \ 2373ebccf1e3SJoseph Koshy } while (0) 2374ebccf1e3SJoseph Koshy 2375ebccf1e3SJoseph Koshy static int 2376ebccf1e3SJoseph Koshy pmc_syscall_handler(struct thread *td, void *syscall_args) 2377ebccf1e3SJoseph Koshy { 2378ebccf1e3SJoseph Koshy int error, is_sx_downgraded, op; 2379ebccf1e3SJoseph Koshy struct pmc_syscall_args *c; 2380ebccf1e3SJoseph Koshy void *arg; 2381ebccf1e3SJoseph Koshy 2382ebccf1e3SJoseph Koshy PMC_GET_SX_XLOCK(ENOSYS); 2383ebccf1e3SJoseph Koshy 2384f263522aSJoseph Koshy DROP_GIANT(); 2385f263522aSJoseph Koshy 2386ebccf1e3SJoseph Koshy is_sx_downgraded = 0; 2387ebccf1e3SJoseph Koshy 2388ebccf1e3SJoseph Koshy c = (struct pmc_syscall_args *) syscall_args; 2389ebccf1e3SJoseph Koshy 2390ebccf1e3SJoseph Koshy op = c->pmop_code; 2391ebccf1e3SJoseph Koshy arg = c->pmop_data; 2392ebccf1e3SJoseph Koshy 2393ebccf1e3SJoseph Koshy PMCDBG(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op, 2394ebccf1e3SJoseph Koshy pmc_op_to_name[op], arg); 2395ebccf1e3SJoseph Koshy 2396ebccf1e3SJoseph Koshy error = 0; 2397ebccf1e3SJoseph Koshy atomic_add_int(&pmc_stats.pm_syscalls, 1); 2398ebccf1e3SJoseph Koshy 2399ebccf1e3SJoseph Koshy switch(op) 2400ebccf1e3SJoseph Koshy { 2401ebccf1e3SJoseph Koshy 2402ebccf1e3SJoseph Koshy 2403ebccf1e3SJoseph Koshy /* 2404ebccf1e3SJoseph Koshy * Configure a log file. 2405ebccf1e3SJoseph Koshy * 2406ebccf1e3SJoseph Koshy * XXX This OP will be reworked. 2407ebccf1e3SJoseph Koshy */ 2408ebccf1e3SJoseph Koshy 2409ebccf1e3SJoseph Koshy case PMC_OP_CONFIGURELOG: 2410ebccf1e3SJoseph Koshy { 2411fc9a2b80SJoseph Koshy struct pmc *pm; 2412ebccf1e3SJoseph Koshy struct pmc_owner *po; 2413ebccf1e3SJoseph Koshy struct pmc_op_configurelog cl; 2414ebccf1e3SJoseph Koshy struct proc *p; 2415ebccf1e3SJoseph Koshy 2416ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 2417ebccf1e3SJoseph Koshy 2418ebccf1e3SJoseph Koshy if ((error = copyin(arg, &cl, sizeof(cl))) != 0) 2419ebccf1e3SJoseph Koshy break; 2420ebccf1e3SJoseph Koshy 2421ebccf1e3SJoseph Koshy /* mark this process as owning a log file */ 2422ebccf1e3SJoseph Koshy p = td->td_proc; 2423ebccf1e3SJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) == NULL) 2424f263522aSJoseph Koshy if ((po = pmc_allocate_owner_descriptor(p)) == NULL) { 2425f263522aSJoseph Koshy error = ENOMEM; 2426ebccf1e3SJoseph Koshy break; 2427f263522aSJoseph Koshy } 2428ebccf1e3SJoseph Koshy 2429f263522aSJoseph Koshy /* 2430f263522aSJoseph Koshy * If a valid fd was passed in, try to configure that, 2431f263522aSJoseph Koshy * otherwise if 'fd' was less than zero and there was 2432f263522aSJoseph Koshy * a log file configured, flush its buffers and 2433f263522aSJoseph Koshy * de-configure it. 2434f263522aSJoseph Koshy */ 2435f263522aSJoseph Koshy if (cl.pm_logfd >= 0) 2436f263522aSJoseph Koshy error = pmclog_configure_log(po, cl.pm_logfd); 2437f263522aSJoseph Koshy else if (po->po_flags & PMC_PO_OWNS_LOGFILE) { 2438f263522aSJoseph Koshy pmclog_process_closelog(po); 2439f263522aSJoseph Koshy error = pmclog_flush(po); 2440fc9a2b80SJoseph Koshy if (error == 0) { 2441fc9a2b80SJoseph Koshy LIST_FOREACH(pm, &po->po_pmcs, pm_next) 2442fc9a2b80SJoseph Koshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE) 2443fc9a2b80SJoseph Koshy pmc_stop(pm); 2444f263522aSJoseph Koshy error = pmclog_deconfigure_log(po); 2445fc9a2b80SJoseph Koshy } 2446f263522aSJoseph Koshy } else 2447f263522aSJoseph Koshy error = EINVAL; 2448ebccf1e3SJoseph Koshy } 2449ebccf1e3SJoseph Koshy break; 2450ebccf1e3SJoseph Koshy 2451ebccf1e3SJoseph Koshy 2452ebccf1e3SJoseph Koshy /* 2453f263522aSJoseph Koshy * Flush a log file. 2454f263522aSJoseph Koshy */ 2455f263522aSJoseph Koshy 2456f263522aSJoseph Koshy case PMC_OP_FLUSHLOG: 2457f263522aSJoseph Koshy { 2458f263522aSJoseph Koshy struct pmc_owner *po; 2459f263522aSJoseph Koshy 2460f263522aSJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 2461f263522aSJoseph Koshy 2462f263522aSJoseph Koshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 2463f263522aSJoseph Koshy error = EINVAL; 2464f263522aSJoseph Koshy break; 2465f263522aSJoseph Koshy } 2466f263522aSJoseph Koshy 2467f263522aSJoseph Koshy error = pmclog_flush(po); 2468f263522aSJoseph Koshy } 2469f263522aSJoseph Koshy break; 2470f263522aSJoseph Koshy 2471f263522aSJoseph Koshy /* 2472ebccf1e3SJoseph Koshy * Retrieve hardware configuration. 2473ebccf1e3SJoseph Koshy */ 2474ebccf1e3SJoseph Koshy 2475ebccf1e3SJoseph Koshy case PMC_OP_GETCPUINFO: /* CPU information */ 2476ebccf1e3SJoseph Koshy { 2477ebccf1e3SJoseph Koshy struct pmc_op_getcpuinfo gci; 2478ebccf1e3SJoseph Koshy 2479ebccf1e3SJoseph Koshy gci.pm_cputype = md->pmd_cputype; 2480c5153e19SJoseph Koshy gci.pm_ncpu = mp_ncpus; 2481ebccf1e3SJoseph Koshy gci.pm_npmc = md->pmd_npmc; 2482ebccf1e3SJoseph Koshy gci.pm_nclass = md->pmd_nclass; 2483ebccf1e3SJoseph Koshy bcopy(md->pmd_classes, &gci.pm_classes, 2484ebccf1e3SJoseph Koshy sizeof(gci.pm_classes)); 2485ebccf1e3SJoseph Koshy error = copyout(&gci, arg, sizeof(gci)); 2486ebccf1e3SJoseph Koshy } 2487ebccf1e3SJoseph Koshy break; 2488ebccf1e3SJoseph Koshy 2489ebccf1e3SJoseph Koshy 2490ebccf1e3SJoseph Koshy /* 2491ebccf1e3SJoseph Koshy * Get module statistics 2492ebccf1e3SJoseph Koshy */ 2493ebccf1e3SJoseph Koshy 2494ebccf1e3SJoseph Koshy case PMC_OP_GETDRIVERSTATS: 2495ebccf1e3SJoseph Koshy { 2496ebccf1e3SJoseph Koshy struct pmc_op_getdriverstats gms; 2497ebccf1e3SJoseph Koshy 2498ebccf1e3SJoseph Koshy bcopy(&pmc_stats, &gms, sizeof(gms)); 2499ebccf1e3SJoseph Koshy error = copyout(&gms, arg, sizeof(gms)); 2500ebccf1e3SJoseph Koshy } 2501ebccf1e3SJoseph Koshy break; 2502ebccf1e3SJoseph Koshy 2503ebccf1e3SJoseph Koshy 2504ebccf1e3SJoseph Koshy /* 2505ebccf1e3SJoseph Koshy * Retrieve module version number 2506ebccf1e3SJoseph Koshy */ 2507ebccf1e3SJoseph Koshy 2508ebccf1e3SJoseph Koshy case PMC_OP_GETMODULEVERSION: 2509ebccf1e3SJoseph Koshy { 2510f263522aSJoseph Koshy uint32_t cv, modv; 2511f263522aSJoseph Koshy 2512f263522aSJoseph Koshy /* retrieve the client's idea of the ABI version */ 2513f263522aSJoseph Koshy if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0) 2514f263522aSJoseph Koshy break; 2515f263522aSJoseph Koshy /* don't service clients newer than our driver */ 2516f263522aSJoseph Koshy modv = PMC_VERSION; 2517f263522aSJoseph Koshy if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) { 2518f263522aSJoseph Koshy error = EPROGMISMATCH; 2519f263522aSJoseph Koshy break; 2520f263522aSJoseph Koshy } 2521f263522aSJoseph Koshy error = copyout(&modv, arg, sizeof(int)); 2522ebccf1e3SJoseph Koshy } 2523ebccf1e3SJoseph Koshy break; 2524ebccf1e3SJoseph Koshy 2525ebccf1e3SJoseph Koshy 2526ebccf1e3SJoseph Koshy /* 2527ebccf1e3SJoseph Koshy * Retrieve the state of all the PMCs on a given 2528ebccf1e3SJoseph Koshy * CPU. 2529ebccf1e3SJoseph Koshy */ 2530ebccf1e3SJoseph Koshy 2531ebccf1e3SJoseph Koshy case PMC_OP_GETPMCINFO: 2532ebccf1e3SJoseph Koshy { 2533ebccf1e3SJoseph Koshy uint32_t cpu, n, npmc; 2534ebccf1e3SJoseph Koshy size_t pmcinfo_size; 2535ebccf1e3SJoseph Koshy struct pmc *pm; 2536ebccf1e3SJoseph Koshy struct pmc_info *p, *pmcinfo; 2537ebccf1e3SJoseph Koshy struct pmc_op_getpmcinfo *gpi; 2538ebccf1e3SJoseph Koshy struct pmc_owner *po; 2539ebccf1e3SJoseph Koshy struct pmc_binding pb; 2540ebccf1e3SJoseph Koshy 2541ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 2542ebccf1e3SJoseph Koshy 2543ebccf1e3SJoseph Koshy gpi = (struct pmc_op_getpmcinfo *) arg; 2544ebccf1e3SJoseph Koshy 2545ebccf1e3SJoseph Koshy if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0) 2546ebccf1e3SJoseph Koshy break; 2547ebccf1e3SJoseph Koshy 2548ebccf1e3SJoseph Koshy if (cpu >= (unsigned int) mp_ncpus) { 2549ebccf1e3SJoseph Koshy error = EINVAL; 2550ebccf1e3SJoseph Koshy break; 2551ebccf1e3SJoseph Koshy } 2552ebccf1e3SJoseph Koshy 2553ebccf1e3SJoseph Koshy if (pmc_cpu_is_disabled(cpu)) { 2554ebccf1e3SJoseph Koshy error = ENXIO; 2555ebccf1e3SJoseph Koshy break; 2556ebccf1e3SJoseph Koshy } 2557ebccf1e3SJoseph Koshy 2558ebccf1e3SJoseph Koshy /* switch to CPU 'cpu' */ 2559ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 2560ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 2561ebccf1e3SJoseph Koshy 2562ebccf1e3SJoseph Koshy npmc = md->pmd_npmc; 2563ebccf1e3SJoseph Koshy 2564ebccf1e3SJoseph Koshy pmcinfo_size = npmc * sizeof(struct pmc_info); 2565ebccf1e3SJoseph Koshy MALLOC(pmcinfo, struct pmc_info *, pmcinfo_size, M_PMC, 2566ebccf1e3SJoseph Koshy M_WAITOK); 2567ebccf1e3SJoseph Koshy 2568ebccf1e3SJoseph Koshy p = pmcinfo; 2569ebccf1e3SJoseph Koshy 2570ebccf1e3SJoseph Koshy for (n = 0; n < md->pmd_npmc; n++, p++) { 2571ebccf1e3SJoseph Koshy 2572ebccf1e3SJoseph Koshy if ((error = md->pmd_describe(cpu, n, p, &pm)) != 0) 2573ebccf1e3SJoseph Koshy break; 2574ebccf1e3SJoseph Koshy 2575ebccf1e3SJoseph Koshy if (PMC_ROW_DISP_IS_STANDALONE(n)) 2576ebccf1e3SJoseph Koshy p->pm_rowdisp = PMC_DISP_STANDALONE; 2577ebccf1e3SJoseph Koshy else if (PMC_ROW_DISP_IS_THREAD(n)) 2578ebccf1e3SJoseph Koshy p->pm_rowdisp = PMC_DISP_THREAD; 2579ebccf1e3SJoseph Koshy else 2580ebccf1e3SJoseph Koshy p->pm_rowdisp = PMC_DISP_FREE; 2581ebccf1e3SJoseph Koshy 2582ebccf1e3SJoseph Koshy p->pm_ownerpid = -1; 2583ebccf1e3SJoseph Koshy 2584ebccf1e3SJoseph Koshy if (pm == NULL) /* no PMC associated */ 2585ebccf1e3SJoseph Koshy continue; 2586ebccf1e3SJoseph Koshy 2587ebccf1e3SJoseph Koshy po = pm->pm_owner; 2588ebccf1e3SJoseph Koshy 2589ebccf1e3SJoseph Koshy KASSERT(po->po_owner != NULL, 2590ebccf1e3SJoseph Koshy ("[pmc,%d] pmc_owner had a null proc pointer", 2591ebccf1e3SJoseph Koshy __LINE__)); 2592ebccf1e3SJoseph Koshy 2593ebccf1e3SJoseph Koshy p->pm_ownerpid = po->po_owner->p_pid; 2594c5153e19SJoseph Koshy p->pm_mode = PMC_TO_MODE(pm); 2595ebccf1e3SJoseph Koshy p->pm_event = pm->pm_event; 2596ebccf1e3SJoseph Koshy p->pm_flags = pm->pm_flags; 2597ebccf1e3SJoseph Koshy 2598c5153e19SJoseph Koshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 2599ebccf1e3SJoseph Koshy p->pm_reloadcount = 2600ebccf1e3SJoseph Koshy pm->pm_sc.pm_reloadcount; 2601ebccf1e3SJoseph Koshy } 2602ebccf1e3SJoseph Koshy 2603ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 2604ebccf1e3SJoseph Koshy 2605ebccf1e3SJoseph Koshy /* now copy out the PMC info collected */ 2606ebccf1e3SJoseph Koshy if (error == 0) 2607ebccf1e3SJoseph Koshy error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size); 2608ebccf1e3SJoseph Koshy 2609ebccf1e3SJoseph Koshy FREE(pmcinfo, M_PMC); 2610ebccf1e3SJoseph Koshy } 2611ebccf1e3SJoseph Koshy break; 2612ebccf1e3SJoseph Koshy 2613ebccf1e3SJoseph Koshy 2614ebccf1e3SJoseph Koshy /* 2615ebccf1e3SJoseph Koshy * Set the administrative state of a PMC. I.e. whether 2616ebccf1e3SJoseph Koshy * the PMC is to be used or not. 2617ebccf1e3SJoseph Koshy */ 2618ebccf1e3SJoseph Koshy 2619ebccf1e3SJoseph Koshy case PMC_OP_PMCADMIN: 2620ebccf1e3SJoseph Koshy { 2621ebccf1e3SJoseph Koshy int cpu, ri; 2622ebccf1e3SJoseph Koshy enum pmc_state request; 2623ebccf1e3SJoseph Koshy struct pmc_cpu *pc; 2624ebccf1e3SJoseph Koshy struct pmc_hw *phw; 2625ebccf1e3SJoseph Koshy struct pmc_op_pmcadmin pma; 2626ebccf1e3SJoseph Koshy struct pmc_binding pb; 2627ebccf1e3SJoseph Koshy 2628ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 2629ebccf1e3SJoseph Koshy 2630ebccf1e3SJoseph Koshy KASSERT(td == curthread, 2631ebccf1e3SJoseph Koshy ("[pmc,%d] td != curthread", __LINE__)); 2632ebccf1e3SJoseph Koshy 2633ebccf1e3SJoseph Koshy if (suser(td) || jailed(td->td_ucred)) { 2634ebccf1e3SJoseph Koshy error = EPERM; 2635ebccf1e3SJoseph Koshy break; 2636ebccf1e3SJoseph Koshy } 2637ebccf1e3SJoseph Koshy 2638ebccf1e3SJoseph Koshy if ((error = copyin(arg, &pma, sizeof(pma))) != 0) 2639ebccf1e3SJoseph Koshy break; 2640ebccf1e3SJoseph Koshy 2641ebccf1e3SJoseph Koshy cpu = pma.pm_cpu; 2642ebccf1e3SJoseph Koshy 2643ebccf1e3SJoseph Koshy if (cpu < 0 || cpu >= mp_ncpus) { 2644ebccf1e3SJoseph Koshy error = EINVAL; 2645ebccf1e3SJoseph Koshy break; 2646ebccf1e3SJoseph Koshy } 2647ebccf1e3SJoseph Koshy 2648ebccf1e3SJoseph Koshy if (pmc_cpu_is_disabled(cpu)) { 2649ebccf1e3SJoseph Koshy error = ENXIO; 2650ebccf1e3SJoseph Koshy break; 2651ebccf1e3SJoseph Koshy } 2652ebccf1e3SJoseph Koshy 2653ebccf1e3SJoseph Koshy request = pma.pm_state; 2654ebccf1e3SJoseph Koshy 2655ebccf1e3SJoseph Koshy if (request != PMC_STATE_DISABLED && 2656ebccf1e3SJoseph Koshy request != PMC_STATE_FREE) { 2657ebccf1e3SJoseph Koshy error = EINVAL; 2658ebccf1e3SJoseph Koshy break; 2659ebccf1e3SJoseph Koshy } 2660ebccf1e3SJoseph Koshy 2661ebccf1e3SJoseph Koshy ri = pma.pm_pmc; /* pmc id == row index */ 2662ebccf1e3SJoseph Koshy if (ri < 0 || ri >= (int) md->pmd_npmc) { 2663ebccf1e3SJoseph Koshy error = EINVAL; 2664ebccf1e3SJoseph Koshy break; 2665ebccf1e3SJoseph Koshy } 2666ebccf1e3SJoseph Koshy 2667ebccf1e3SJoseph Koshy /* 2668ebccf1e3SJoseph Koshy * We can't disable a PMC with a row-index allocated 2669ebccf1e3SJoseph Koshy * for process virtual PMCs. 2670ebccf1e3SJoseph Koshy */ 2671ebccf1e3SJoseph Koshy 2672ebccf1e3SJoseph Koshy if (PMC_ROW_DISP_IS_THREAD(ri) && 2673ebccf1e3SJoseph Koshy request == PMC_STATE_DISABLED) { 2674ebccf1e3SJoseph Koshy error = EBUSY; 2675ebccf1e3SJoseph Koshy break; 2676ebccf1e3SJoseph Koshy } 2677ebccf1e3SJoseph Koshy 2678ebccf1e3SJoseph Koshy /* 2679ebccf1e3SJoseph Koshy * otherwise, this PMC on this CPU is either free or 2680ebccf1e3SJoseph Koshy * in system-wide mode. 2681ebccf1e3SJoseph Koshy */ 2682ebccf1e3SJoseph Koshy 2683ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 2684ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 2685ebccf1e3SJoseph Koshy 2686ebccf1e3SJoseph Koshy pc = pmc_pcpu[cpu]; 2687ebccf1e3SJoseph Koshy phw = pc->pc_hwpmcs[ri]; 2688ebccf1e3SJoseph Koshy 2689ebccf1e3SJoseph Koshy /* 2690ebccf1e3SJoseph Koshy * XXX do we need some kind of 'forced' disable? 2691ebccf1e3SJoseph Koshy */ 2692ebccf1e3SJoseph Koshy 2693ebccf1e3SJoseph Koshy if (phw->phw_pmc == NULL) { 2694ebccf1e3SJoseph Koshy if (request == PMC_STATE_DISABLED && 2695ebccf1e3SJoseph Koshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) { 2696ebccf1e3SJoseph Koshy phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED; 2697ebccf1e3SJoseph Koshy PMC_MARK_ROW_STANDALONE(ri); 2698ebccf1e3SJoseph Koshy } else if (request == PMC_STATE_FREE && 2699ebccf1e3SJoseph Koshy (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) { 2700ebccf1e3SJoseph Koshy phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED; 2701ebccf1e3SJoseph Koshy PMC_UNMARK_ROW_STANDALONE(ri); 2702ebccf1e3SJoseph Koshy } 2703ebccf1e3SJoseph Koshy /* other cases are a no-op */ 2704ebccf1e3SJoseph Koshy } else 2705ebccf1e3SJoseph Koshy error = EBUSY; 2706ebccf1e3SJoseph Koshy 2707ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 2708ebccf1e3SJoseph Koshy } 2709ebccf1e3SJoseph Koshy break; 2710ebccf1e3SJoseph Koshy 2711ebccf1e3SJoseph Koshy 2712ebccf1e3SJoseph Koshy /* 2713ebccf1e3SJoseph Koshy * Allocate a PMC. 2714ebccf1e3SJoseph Koshy */ 2715ebccf1e3SJoseph Koshy 2716ebccf1e3SJoseph Koshy case PMC_OP_PMCALLOCATE: 2717ebccf1e3SJoseph Koshy { 2718ebccf1e3SJoseph Koshy uint32_t caps; 2719ebccf1e3SJoseph Koshy u_int cpu; 2720ebccf1e3SJoseph Koshy int n; 2721ebccf1e3SJoseph Koshy enum pmc_mode mode; 2722ebccf1e3SJoseph Koshy struct pmc *pmc; 2723c5153e19SJoseph Koshy struct pmc_hw *phw; 2724ebccf1e3SJoseph Koshy struct pmc_op_pmcallocate pa; 2725ebccf1e3SJoseph Koshy struct pmc_binding pb; 2726ebccf1e3SJoseph Koshy 2727ebccf1e3SJoseph Koshy if ((error = copyin(arg, &pa, sizeof(pa))) != 0) 2728ebccf1e3SJoseph Koshy break; 2729ebccf1e3SJoseph Koshy 2730ebccf1e3SJoseph Koshy caps = pa.pm_caps; 2731ebccf1e3SJoseph Koshy mode = pa.pm_mode; 2732ebccf1e3SJoseph Koshy cpu = pa.pm_cpu; 2733ebccf1e3SJoseph Koshy 2734ebccf1e3SJoseph Koshy if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC && 2735ebccf1e3SJoseph Koshy mode != PMC_MODE_TS && mode != PMC_MODE_TC) || 2736ebccf1e3SJoseph Koshy (cpu != (u_int) PMC_CPU_ANY && cpu >= (u_int) mp_ncpus)) { 2737ebccf1e3SJoseph Koshy error = EINVAL; 2738ebccf1e3SJoseph Koshy break; 2739ebccf1e3SJoseph Koshy } 2740ebccf1e3SJoseph Koshy 2741ebccf1e3SJoseph Koshy /* 2742ebccf1e3SJoseph Koshy * Virtual PMCs should only ask for a default CPU. 2743ebccf1e3SJoseph Koshy * System mode PMCs need to specify a non-default CPU. 2744ebccf1e3SJoseph Koshy */ 2745ebccf1e3SJoseph Koshy 2746ebccf1e3SJoseph Koshy if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) || 2747ebccf1e3SJoseph Koshy (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) { 2748ebccf1e3SJoseph Koshy error = EINVAL; 2749ebccf1e3SJoseph Koshy break; 2750ebccf1e3SJoseph Koshy } 2751ebccf1e3SJoseph Koshy 2752ebccf1e3SJoseph Koshy /* 2753ebccf1e3SJoseph Koshy * Check that a disabled CPU is not being asked for. 2754ebccf1e3SJoseph Koshy */ 2755ebccf1e3SJoseph Koshy 2756ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode) && pmc_cpu_is_disabled(cpu)) { 2757ebccf1e3SJoseph Koshy error = ENXIO; 2758ebccf1e3SJoseph Koshy break; 2759ebccf1e3SJoseph Koshy } 2760ebccf1e3SJoseph Koshy 2761ebccf1e3SJoseph Koshy /* 2762ebccf1e3SJoseph Koshy * Refuse an allocation for a system-wide PMC if this 2763ebccf1e3SJoseph Koshy * process has been jailed, or if this process lacks 2764ebccf1e3SJoseph Koshy * super-user credentials and the sysctl tunable 2765ebccf1e3SJoseph Koshy * 'security.bsd.unprivileged_syspmcs' is zero. 2766ebccf1e3SJoseph Koshy */ 2767ebccf1e3SJoseph Koshy 2768ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) { 2769ebccf1e3SJoseph Koshy if (jailed(curthread->td_ucred)) 2770ebccf1e3SJoseph Koshy error = EPERM; 2771ebccf1e3SJoseph Koshy else if (suser(curthread) && 2772ebccf1e3SJoseph Koshy (pmc_unprivileged_syspmcs == 0)) 2773ebccf1e3SJoseph Koshy error = EPERM; 2774ebccf1e3SJoseph Koshy } 2775ebccf1e3SJoseph Koshy 2776ebccf1e3SJoseph Koshy if (error) 2777ebccf1e3SJoseph Koshy break; 2778ebccf1e3SJoseph Koshy 2779ebccf1e3SJoseph Koshy /* 2780ebccf1e3SJoseph Koshy * Look for valid values for 'pm_flags' 2781ebccf1e3SJoseph Koshy */ 2782ebccf1e3SJoseph Koshy 2783f263522aSJoseph Koshy if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW | 2784f263522aSJoseph Koshy PMC_F_LOG_PROCEXIT)) != 0) { 2785f263522aSJoseph Koshy error = EINVAL; 2786f263522aSJoseph Koshy break; 2787f263522aSJoseph Koshy } 2788f263522aSJoseph Koshy 2789f263522aSJoseph Koshy /* process logging options are not allowed for system PMCs */ 2790f263522aSJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags & 2791f263522aSJoseph Koshy (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) { 2792ebccf1e3SJoseph Koshy error = EINVAL; 2793ebccf1e3SJoseph Koshy break; 2794ebccf1e3SJoseph Koshy } 2795ebccf1e3SJoseph Koshy 2796ebccf1e3SJoseph Koshy /* 2797ebccf1e3SJoseph Koshy * All sampling mode PMCs need to be able to interrupt the 2798ebccf1e3SJoseph Koshy * CPU. 2799ebccf1e3SJoseph Koshy */ 2800f263522aSJoseph Koshy if (PMC_IS_SAMPLING_MODE(mode)) 2801ebccf1e3SJoseph Koshy caps |= PMC_CAP_INTERRUPT; 2802ebccf1e3SJoseph Koshy 2803744d6797SJoseph Koshy /* A valid class specifier should have been passed in. */ 2804744d6797SJoseph Koshy for (n = 0; n < md->pmd_nclass; n++) 2805744d6797SJoseph Koshy if (md->pmd_classes[n].pm_class == pa.pm_class) 2806744d6797SJoseph Koshy break; 2807744d6797SJoseph Koshy if (n == md->pmd_nclass) { 2808744d6797SJoseph Koshy error = EINVAL; 2809744d6797SJoseph Koshy break; 2810744d6797SJoseph Koshy } 2811744d6797SJoseph Koshy 2812744d6797SJoseph Koshy /* The requested PMC capabilities should be feasible. */ 2813744d6797SJoseph Koshy if ((md->pmd_classes[n].pm_caps & caps) != caps) { 2814744d6797SJoseph Koshy error = EOPNOTSUPP; 2815744d6797SJoseph Koshy break; 2816744d6797SJoseph Koshy } 2817744d6797SJoseph Koshy 2818ebccf1e3SJoseph Koshy PMCDBG(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d", 2819ebccf1e3SJoseph Koshy pa.pm_ev, caps, mode, cpu); 2820ebccf1e3SJoseph Koshy 2821ebccf1e3SJoseph Koshy pmc = pmc_allocate_pmc_descriptor(); 2822c5153e19SJoseph Koshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class, 2823c5153e19SJoseph Koshy PMC_ID_INVALID); 2824ebccf1e3SJoseph Koshy pmc->pm_event = pa.pm_ev; 2825ebccf1e3SJoseph Koshy pmc->pm_state = PMC_STATE_FREE; 2826ebccf1e3SJoseph Koshy pmc->pm_caps = caps; 2827ebccf1e3SJoseph Koshy pmc->pm_flags = pa.pm_flags; 2828ebccf1e3SJoseph Koshy 2829ebccf1e3SJoseph Koshy /* switch thread to CPU 'cpu' */ 2830ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 2831ebccf1e3SJoseph Koshy 2832ebccf1e3SJoseph Koshy #define PMC_IS_SHAREABLE_PMC(cpu, n) \ 2833ebccf1e3SJoseph Koshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \ 2834ebccf1e3SJoseph Koshy PMC_PHW_FLAG_IS_SHAREABLE) 2835ebccf1e3SJoseph Koshy #define PMC_IS_UNALLOCATED(cpu, n) \ 2836ebccf1e3SJoseph Koshy (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL) 2837ebccf1e3SJoseph Koshy 2838ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) { 2839ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 2840ebccf1e3SJoseph Koshy for (n = 0; n < (int) md->pmd_npmc; n++) 2841ebccf1e3SJoseph Koshy if (pmc_can_allocate_row(n, mode) == 0 && 2842ebccf1e3SJoseph Koshy pmc_can_allocate_rowindex( 2843c5153e19SJoseph Koshy curthread->td_proc, n, cpu) == 0 && 2844ebccf1e3SJoseph Koshy (PMC_IS_UNALLOCATED(cpu, n) || 2845ebccf1e3SJoseph Koshy PMC_IS_SHAREABLE_PMC(cpu, n)) && 2846ebccf1e3SJoseph Koshy md->pmd_allocate_pmc(cpu, n, pmc, 2847ebccf1e3SJoseph Koshy &pa) == 0) 2848ebccf1e3SJoseph Koshy break; 2849ebccf1e3SJoseph Koshy } else { 2850ebccf1e3SJoseph Koshy /* Process virtual mode */ 2851ebccf1e3SJoseph Koshy for (n = 0; n < (int) md->pmd_npmc; n++) { 2852ebccf1e3SJoseph Koshy if (pmc_can_allocate_row(n, mode) == 0 && 2853ebccf1e3SJoseph Koshy pmc_can_allocate_rowindex( 2854c5153e19SJoseph Koshy curthread->td_proc, n, 2855c5153e19SJoseph Koshy PMC_CPU_ANY) == 0 && 2856ebccf1e3SJoseph Koshy md->pmd_allocate_pmc(curthread->td_oncpu, 2857ebccf1e3SJoseph Koshy n, pmc, &pa) == 0) 2858ebccf1e3SJoseph Koshy break; 2859ebccf1e3SJoseph Koshy } 2860ebccf1e3SJoseph Koshy } 2861ebccf1e3SJoseph Koshy 2862ebccf1e3SJoseph Koshy #undef PMC_IS_UNALLOCATED 2863ebccf1e3SJoseph Koshy #undef PMC_IS_SHAREABLE_PMC 2864ebccf1e3SJoseph Koshy 2865ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 2866ebccf1e3SJoseph Koshy 2867ebccf1e3SJoseph Koshy if (n == (int) md->pmd_npmc) { 2868ebccf1e3SJoseph Koshy pmc_destroy_pmc_descriptor(pmc); 2869ebccf1e3SJoseph Koshy FREE(pmc, M_PMC); 2870ebccf1e3SJoseph Koshy pmc = NULL; 2871ebccf1e3SJoseph Koshy error = EINVAL; 2872ebccf1e3SJoseph Koshy break; 2873ebccf1e3SJoseph Koshy } 2874ebccf1e3SJoseph Koshy 2875c5153e19SJoseph Koshy /* Fill in the correct value in the ID field */ 2876c5153e19SJoseph Koshy pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n); 2877c5153e19SJoseph Koshy 2878c5153e19SJoseph Koshy PMCDBG(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x", 2879c5153e19SJoseph Koshy pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id); 2880ebccf1e3SJoseph Koshy 2881f263522aSJoseph Koshy /* Process mode PMCs with logging enabled need log files */ 2882f263522aSJoseph Koshy if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW)) 2883f263522aSJoseph Koshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 2884f263522aSJoseph Koshy 2885f263522aSJoseph Koshy /* All system mode sampling PMCs require a log file */ 2886f263522aSJoseph Koshy if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode)) 2887f263522aSJoseph Koshy pmc->pm_flags |= PMC_F_NEEDS_LOGFILE; 2888f263522aSJoseph Koshy 2889ebccf1e3SJoseph Koshy /* 2890ebccf1e3SJoseph Koshy * Configure global pmc's immediately 2891ebccf1e3SJoseph Koshy */ 2892ebccf1e3SJoseph Koshy 2893c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) { 2894c5153e19SJoseph Koshy 2895c5153e19SJoseph Koshy pmc_save_cpu_binding(&pb); 2896c5153e19SJoseph Koshy pmc_select_cpu(cpu); 2897c5153e19SJoseph Koshy 2898c5153e19SJoseph Koshy phw = pmc_pcpu[cpu]->pc_hwpmcs[n]; 2899c5153e19SJoseph Koshy 2900c5153e19SJoseph Koshy if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 || 2901c5153e19SJoseph Koshy (error = md->pmd_config_pmc(cpu, n, pmc)) != 0) { 2902ebccf1e3SJoseph Koshy (void) md->pmd_release_pmc(cpu, n, pmc); 2903ebccf1e3SJoseph Koshy pmc_destroy_pmc_descriptor(pmc); 2904ebccf1e3SJoseph Koshy FREE(pmc, M_PMC); 2905ebccf1e3SJoseph Koshy pmc = NULL; 2906c5153e19SJoseph Koshy pmc_restore_cpu_binding(&pb); 2907c5153e19SJoseph Koshy error = EPERM; 2908ebccf1e3SJoseph Koshy break; 2909ebccf1e3SJoseph Koshy } 2910ebccf1e3SJoseph Koshy 2911c5153e19SJoseph Koshy pmc_restore_cpu_binding(&pb); 2912c5153e19SJoseph Koshy } 2913ebccf1e3SJoseph Koshy 2914ebccf1e3SJoseph Koshy pmc->pm_state = PMC_STATE_ALLOCATED; 2915ebccf1e3SJoseph Koshy 2916ebccf1e3SJoseph Koshy /* 2917ebccf1e3SJoseph Koshy * mark row disposition 2918ebccf1e3SJoseph Koshy */ 2919ebccf1e3SJoseph Koshy 2920ebccf1e3SJoseph Koshy if (PMC_IS_SYSTEM_MODE(mode)) 2921ebccf1e3SJoseph Koshy PMC_MARK_ROW_STANDALONE(n); 2922ebccf1e3SJoseph Koshy else 2923ebccf1e3SJoseph Koshy PMC_MARK_ROW_THREAD(n); 2924ebccf1e3SJoseph Koshy 2925ebccf1e3SJoseph Koshy /* 2926ebccf1e3SJoseph Koshy * Register this PMC with the current thread as its owner. 2927ebccf1e3SJoseph Koshy */ 2928ebccf1e3SJoseph Koshy 2929ebccf1e3SJoseph Koshy if ((error = 2930ebccf1e3SJoseph Koshy pmc_register_owner(curthread->td_proc, pmc)) != 0) { 2931ebccf1e3SJoseph Koshy pmc_release_pmc_descriptor(pmc); 2932ebccf1e3SJoseph Koshy FREE(pmc, M_PMC); 2933ebccf1e3SJoseph Koshy pmc = NULL; 2934ebccf1e3SJoseph Koshy break; 2935ebccf1e3SJoseph Koshy } 2936ebccf1e3SJoseph Koshy 2937ebccf1e3SJoseph Koshy /* 2938ebccf1e3SJoseph Koshy * Return the allocated index. 2939ebccf1e3SJoseph Koshy */ 2940ebccf1e3SJoseph Koshy 2941c5153e19SJoseph Koshy pa.pm_pmcid = pmc->pm_id; 2942ebccf1e3SJoseph Koshy 2943ebccf1e3SJoseph Koshy error = copyout(&pa, arg, sizeof(pa)); 2944ebccf1e3SJoseph Koshy } 2945ebccf1e3SJoseph Koshy break; 2946ebccf1e3SJoseph Koshy 2947ebccf1e3SJoseph Koshy 2948ebccf1e3SJoseph Koshy /* 2949ebccf1e3SJoseph Koshy * Attach a PMC to a process. 2950ebccf1e3SJoseph Koshy */ 2951ebccf1e3SJoseph Koshy 2952ebccf1e3SJoseph Koshy case PMC_OP_PMCATTACH: 2953ebccf1e3SJoseph Koshy { 2954ebccf1e3SJoseph Koshy struct pmc *pm; 2955ebccf1e3SJoseph Koshy struct proc *p; 2956ebccf1e3SJoseph Koshy struct pmc_op_pmcattach a; 2957ebccf1e3SJoseph Koshy 2958ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 2959ebccf1e3SJoseph Koshy 2960ebccf1e3SJoseph Koshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 2961ebccf1e3SJoseph Koshy break; 2962ebccf1e3SJoseph Koshy 2963ebccf1e3SJoseph Koshy if (a.pm_pid < 0) { 2964ebccf1e3SJoseph Koshy error = EINVAL; 2965ebccf1e3SJoseph Koshy break; 2966ebccf1e3SJoseph Koshy } else if (a.pm_pid == 0) 2967ebccf1e3SJoseph Koshy a.pm_pid = td->td_proc->p_pid; 2968ebccf1e3SJoseph Koshy 2969ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 2970ebccf1e3SJoseph Koshy break; 2971ebccf1e3SJoseph Koshy 2972c5153e19SJoseph Koshy if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) { 2973ebccf1e3SJoseph Koshy error = EINVAL; 2974ebccf1e3SJoseph Koshy break; 2975ebccf1e3SJoseph Koshy } 2976ebccf1e3SJoseph Koshy 2977ebccf1e3SJoseph Koshy /* PMCs may be (re)attached only when allocated or stopped */ 2978ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING) { 2979ebccf1e3SJoseph Koshy error = EBUSY; 2980ebccf1e3SJoseph Koshy break; 2981ebccf1e3SJoseph Koshy } else if (pm->pm_state != PMC_STATE_ALLOCATED && 2982ebccf1e3SJoseph Koshy pm->pm_state != PMC_STATE_STOPPED) { 2983ebccf1e3SJoseph Koshy error = EINVAL; 2984ebccf1e3SJoseph Koshy break; 2985ebccf1e3SJoseph Koshy } 2986ebccf1e3SJoseph Koshy 2987ebccf1e3SJoseph Koshy /* lookup pid */ 2988ebccf1e3SJoseph Koshy if ((p = pfind(a.pm_pid)) == NULL) { 2989ebccf1e3SJoseph Koshy error = ESRCH; 2990ebccf1e3SJoseph Koshy break; 2991ebccf1e3SJoseph Koshy } 2992ebccf1e3SJoseph Koshy 2993ebccf1e3SJoseph Koshy /* 2994ebccf1e3SJoseph Koshy * Ignore processes that are working on exiting. 2995ebccf1e3SJoseph Koshy */ 2996ebccf1e3SJoseph Koshy if (p->p_flag & P_WEXIT) { 2997ebccf1e3SJoseph Koshy error = ESRCH; 2998ebccf1e3SJoseph Koshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 2999ebccf1e3SJoseph Koshy break; 3000ebccf1e3SJoseph Koshy } 3001ebccf1e3SJoseph Koshy 3002ebccf1e3SJoseph Koshy /* 3003ebccf1e3SJoseph Koshy * we are allowed to attach a PMC to a process if 3004ebccf1e3SJoseph Koshy * we can debug it. 3005ebccf1e3SJoseph Koshy */ 3006ebccf1e3SJoseph Koshy error = p_candebug(curthread, p); 3007ebccf1e3SJoseph Koshy 3008ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 3009ebccf1e3SJoseph Koshy 3010ebccf1e3SJoseph Koshy if (error == 0) 3011ebccf1e3SJoseph Koshy error = pmc_attach_process(p, pm); 3012ebccf1e3SJoseph Koshy } 3013ebccf1e3SJoseph Koshy break; 3014ebccf1e3SJoseph Koshy 3015ebccf1e3SJoseph Koshy 3016ebccf1e3SJoseph Koshy /* 3017ebccf1e3SJoseph Koshy * Detach an attached PMC from a process. 3018ebccf1e3SJoseph Koshy */ 3019ebccf1e3SJoseph Koshy 3020ebccf1e3SJoseph Koshy case PMC_OP_PMCDETACH: 3021ebccf1e3SJoseph Koshy { 3022ebccf1e3SJoseph Koshy struct pmc *pm; 3023ebccf1e3SJoseph Koshy struct proc *p; 3024ebccf1e3SJoseph Koshy struct pmc_op_pmcattach a; 3025ebccf1e3SJoseph Koshy 3026ebccf1e3SJoseph Koshy if ((error = copyin(arg, &a, sizeof(a))) != 0) 3027ebccf1e3SJoseph Koshy break; 3028ebccf1e3SJoseph Koshy 3029ebccf1e3SJoseph Koshy if (a.pm_pid < 0) { 3030ebccf1e3SJoseph Koshy error = EINVAL; 3031ebccf1e3SJoseph Koshy break; 3032ebccf1e3SJoseph Koshy } else if (a.pm_pid == 0) 3033ebccf1e3SJoseph Koshy a.pm_pid = td->td_proc->p_pid; 3034ebccf1e3SJoseph Koshy 3035ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0) 3036ebccf1e3SJoseph Koshy break; 3037ebccf1e3SJoseph Koshy 3038ebccf1e3SJoseph Koshy if ((p = pfind(a.pm_pid)) == NULL) { 3039ebccf1e3SJoseph Koshy error = ESRCH; 3040ebccf1e3SJoseph Koshy break; 3041ebccf1e3SJoseph Koshy } 3042ebccf1e3SJoseph Koshy 3043ebccf1e3SJoseph Koshy /* 3044ebccf1e3SJoseph Koshy * Treat processes that are in the process of exiting 3045ebccf1e3SJoseph Koshy * as if they were not present. 3046ebccf1e3SJoseph Koshy */ 3047ebccf1e3SJoseph Koshy 3048ebccf1e3SJoseph Koshy if (p->p_flag & P_WEXIT) 3049ebccf1e3SJoseph Koshy error = ESRCH; 3050ebccf1e3SJoseph Koshy 3051ebccf1e3SJoseph Koshy PROC_UNLOCK(p); /* pfind() returns a locked process */ 3052ebccf1e3SJoseph Koshy 3053ebccf1e3SJoseph Koshy if (error == 0) 3054ebccf1e3SJoseph Koshy error = pmc_detach_process(p, pm); 3055ebccf1e3SJoseph Koshy } 3056ebccf1e3SJoseph Koshy break; 3057ebccf1e3SJoseph Koshy 3058ebccf1e3SJoseph Koshy 3059ebccf1e3SJoseph Koshy /* 3060f263522aSJoseph Koshy * Retrieve the MSR number associated with the counter 3061f263522aSJoseph Koshy * 'pmc_id'. This allows processes to directly use RDPMC 3062f263522aSJoseph Koshy * instructions to read their PMCs, without the overhead of a 3063f263522aSJoseph Koshy * system call. 3064f263522aSJoseph Koshy */ 3065f263522aSJoseph Koshy 3066f263522aSJoseph Koshy case PMC_OP_PMCGETMSR: 3067f263522aSJoseph Koshy { 3068f263522aSJoseph Koshy int ri; 3069f263522aSJoseph Koshy struct pmc *pm; 3070f263522aSJoseph Koshy struct pmc_target *pt; 3071f263522aSJoseph Koshy struct pmc_op_getmsr gm; 3072f263522aSJoseph Koshy 3073f263522aSJoseph Koshy PMC_DOWNGRADE_SX(); 3074f263522aSJoseph Koshy 3075f263522aSJoseph Koshy /* CPU has no 'GETMSR' support */ 3076f263522aSJoseph Koshy if (md->pmd_get_msr == NULL) { 3077f263522aSJoseph Koshy error = ENOSYS; 3078f263522aSJoseph Koshy break; 3079f263522aSJoseph Koshy } 3080f263522aSJoseph Koshy 3081f263522aSJoseph Koshy if ((error = copyin(arg, &gm, sizeof(gm))) != 0) 3082f263522aSJoseph Koshy break; 3083f263522aSJoseph Koshy 3084f263522aSJoseph Koshy if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0) 3085f263522aSJoseph Koshy break; 3086f263522aSJoseph Koshy 3087f263522aSJoseph Koshy /* 3088f263522aSJoseph Koshy * The allocated PMC has to be a process virtual PMC, 3089f263522aSJoseph Koshy * i.e., of type MODE_T[CS]. Global PMCs can only be 3090f263522aSJoseph Koshy * read using the PMCREAD operation since they may be 3091f263522aSJoseph Koshy * allocated on a different CPU than the one we could 3092f263522aSJoseph Koshy * be running on at the time of the RDPMC instruction. 3093f263522aSJoseph Koshy * 3094f263522aSJoseph Koshy * The GETMSR operation is not allowed for PMCs that 3095f263522aSJoseph Koshy * are inherited across processes. 3096f263522aSJoseph Koshy */ 3097f263522aSJoseph Koshy 3098f263522aSJoseph Koshy if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) || 3099f263522aSJoseph Koshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3100f263522aSJoseph Koshy error = EINVAL; 3101f263522aSJoseph Koshy break; 3102f263522aSJoseph Koshy } 3103f263522aSJoseph Koshy 3104f263522aSJoseph Koshy /* 3105f263522aSJoseph Koshy * It only makes sense to use a RDPMC (or its 3106f263522aSJoseph Koshy * equivalent instruction on non-x86 architectures) on 3107f263522aSJoseph Koshy * a process that has allocated and attached a PMC to 3108f263522aSJoseph Koshy * itself. Conversely the PMC is only allowed to have 3109f263522aSJoseph Koshy * one process attached to it -- its owner. 3110f263522aSJoseph Koshy */ 3111f263522aSJoseph Koshy 3112f263522aSJoseph Koshy if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL || 3113f263522aSJoseph Koshy LIST_NEXT(pt, pt_next) != NULL || 3114f263522aSJoseph Koshy pt->pt_process->pp_proc != pm->pm_owner->po_owner) { 3115f263522aSJoseph Koshy error = EINVAL; 3116f263522aSJoseph Koshy break; 3117f263522aSJoseph Koshy } 3118f263522aSJoseph Koshy 3119f263522aSJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 3120f263522aSJoseph Koshy 3121f263522aSJoseph Koshy if ((error = (*md->pmd_get_msr)(ri, &gm.pm_msr)) < 0) 3122f263522aSJoseph Koshy break; 3123f263522aSJoseph Koshy 3124f263522aSJoseph Koshy if ((error = copyout(&gm, arg, sizeof(gm))) < 0) 3125f263522aSJoseph Koshy break; 3126f263522aSJoseph Koshy 3127f263522aSJoseph Koshy /* 3128f263522aSJoseph Koshy * Mark our process as using MSRs. Update machine 3129f263522aSJoseph Koshy * state using a forced context switch. 3130f263522aSJoseph Koshy */ 3131f263522aSJoseph Koshy 3132f263522aSJoseph Koshy pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS; 3133f263522aSJoseph Koshy pmc_force_context_switch(); 3134f263522aSJoseph Koshy 3135f263522aSJoseph Koshy } 3136f263522aSJoseph Koshy break; 3137f263522aSJoseph Koshy 3138f263522aSJoseph Koshy /* 3139ebccf1e3SJoseph Koshy * Release an allocated PMC 3140ebccf1e3SJoseph Koshy */ 3141ebccf1e3SJoseph Koshy 3142ebccf1e3SJoseph Koshy case PMC_OP_PMCRELEASE: 3143ebccf1e3SJoseph Koshy { 3144ebccf1e3SJoseph Koshy pmc_id_t pmcid; 3145ebccf1e3SJoseph Koshy struct pmc *pm; 3146ebccf1e3SJoseph Koshy struct pmc_owner *po; 3147ebccf1e3SJoseph Koshy struct pmc_op_simple sp; 3148ebccf1e3SJoseph Koshy 3149ebccf1e3SJoseph Koshy /* 3150ebccf1e3SJoseph Koshy * Find PMC pointer for the named PMC. 3151ebccf1e3SJoseph Koshy * 3152ebccf1e3SJoseph Koshy * Use pmc_release_pmc_descriptor() to switch off the 3153ebccf1e3SJoseph Koshy * PMC, remove all its target threads, and remove the 3154ebccf1e3SJoseph Koshy * PMC from its owner's list. 3155ebccf1e3SJoseph Koshy * 3156ebccf1e3SJoseph Koshy * Remove the owner record if this is the last PMC 3157ebccf1e3SJoseph Koshy * owned. 3158ebccf1e3SJoseph Koshy * 3159ebccf1e3SJoseph Koshy * Free up space. 3160ebccf1e3SJoseph Koshy */ 3161ebccf1e3SJoseph Koshy 3162ebccf1e3SJoseph Koshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3163ebccf1e3SJoseph Koshy break; 3164ebccf1e3SJoseph Koshy 3165ebccf1e3SJoseph Koshy pmcid = sp.pm_pmcid; 3166ebccf1e3SJoseph Koshy 3167ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3168ebccf1e3SJoseph Koshy break; 3169ebccf1e3SJoseph Koshy 3170ebccf1e3SJoseph Koshy po = pm->pm_owner; 3171ebccf1e3SJoseph Koshy pmc_release_pmc_descriptor(pm); 3172ebccf1e3SJoseph Koshy pmc_maybe_remove_owner(po); 3173ebccf1e3SJoseph Koshy 3174ebccf1e3SJoseph Koshy FREE(pm, M_PMC); 3175ebccf1e3SJoseph Koshy } 3176ebccf1e3SJoseph Koshy break; 3177ebccf1e3SJoseph Koshy 3178ebccf1e3SJoseph Koshy 3179ebccf1e3SJoseph Koshy /* 3180ebccf1e3SJoseph Koshy * Read and/or write a PMC. 3181ebccf1e3SJoseph Koshy */ 3182ebccf1e3SJoseph Koshy 3183ebccf1e3SJoseph Koshy case PMC_OP_PMCRW: 3184ebccf1e3SJoseph Koshy { 3185ebccf1e3SJoseph Koshy uint32_t cpu, ri; 3186ebccf1e3SJoseph Koshy struct pmc *pm; 3187ebccf1e3SJoseph Koshy struct pmc_op_pmcrw *pprw; 3188ebccf1e3SJoseph Koshy struct pmc_op_pmcrw prw; 3189ebccf1e3SJoseph Koshy struct pmc_binding pb; 3190ebccf1e3SJoseph Koshy pmc_value_t oldvalue; 3191ebccf1e3SJoseph Koshy 3192ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 3193ebccf1e3SJoseph Koshy 3194ebccf1e3SJoseph Koshy if ((error = copyin(arg, &prw, sizeof(prw))) != 0) 3195ebccf1e3SJoseph Koshy break; 3196ebccf1e3SJoseph Koshy 3197869f4a8bSWarner Losh ri = 0; 3198ebccf1e3SJoseph Koshy PMCDBG(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid, 3199ebccf1e3SJoseph Koshy prw.pm_flags); 3200ebccf1e3SJoseph Koshy 3201ebccf1e3SJoseph Koshy /* must have at least one flag set */ 3202ebccf1e3SJoseph Koshy if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) { 3203ebccf1e3SJoseph Koshy error = EINVAL; 3204ebccf1e3SJoseph Koshy break; 3205ebccf1e3SJoseph Koshy } 3206ebccf1e3SJoseph Koshy 3207ebccf1e3SJoseph Koshy /* locate pmc descriptor */ 3208ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0) 3209ebccf1e3SJoseph Koshy break; 3210ebccf1e3SJoseph Koshy 3211ebccf1e3SJoseph Koshy /* Can't read a PMC that hasn't been started. */ 3212ebccf1e3SJoseph Koshy if (pm->pm_state != PMC_STATE_ALLOCATED && 3213ebccf1e3SJoseph Koshy pm->pm_state != PMC_STATE_STOPPED && 3214ebccf1e3SJoseph Koshy pm->pm_state != PMC_STATE_RUNNING) { 3215ebccf1e3SJoseph Koshy error = EINVAL; 3216ebccf1e3SJoseph Koshy break; 3217ebccf1e3SJoseph Koshy } 3218ebccf1e3SJoseph Koshy 3219ebccf1e3SJoseph Koshy /* writing a new value is allowed only for 'STOPPED' pmcs */ 3220ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING && 3221ebccf1e3SJoseph Koshy (prw.pm_flags & PMC_F_NEWVALUE)) { 3222ebccf1e3SJoseph Koshy error = EBUSY; 3223ebccf1e3SJoseph Koshy break; 3224ebccf1e3SJoseph Koshy } 3225ebccf1e3SJoseph Koshy 3226c5153e19SJoseph Koshy if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) { 3227ebccf1e3SJoseph Koshy 3228c5153e19SJoseph Koshy /* 3229c5153e19SJoseph Koshy * If this PMC is attached to its owner (i.e., 3230c5153e19SJoseph Koshy * the process requesting this operation) and 3231c5153e19SJoseph Koshy * is running, then attempt to get an 3232c5153e19SJoseph Koshy * upto-date reading from hardware for a READ. 3233c5153e19SJoseph Koshy * Writes are only allowed when the PMC is 3234c5153e19SJoseph Koshy * stopped, so only update the saved value 3235c5153e19SJoseph Koshy * field. 3236c5153e19SJoseph Koshy * 3237c5153e19SJoseph Koshy * If the PMC is not running, or is not 3238c5153e19SJoseph Koshy * attached to its owner, read/write to the 3239c5153e19SJoseph Koshy * savedvalue field. 3240c5153e19SJoseph Koshy */ 3241c5153e19SJoseph Koshy 3242c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 3243c5153e19SJoseph Koshy 3244ebccf1e3SJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3245c5153e19SJoseph Koshy cpu = curthread->td_oncpu; 3246c5153e19SJoseph Koshy 3247c5153e19SJoseph Koshy if (prw.pm_flags & PMC_F_OLDVALUE) { 3248c5153e19SJoseph Koshy if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) && 3249c5153e19SJoseph Koshy (pm->pm_state == PMC_STATE_RUNNING)) 3250c5153e19SJoseph Koshy error = (*md->pmd_read_pmc)(cpu, ri, 3251c5153e19SJoseph Koshy &oldvalue); 3252c5153e19SJoseph Koshy else 3253ebccf1e3SJoseph Koshy oldvalue = pm->pm_gv.pm_savedvalue; 3254c5153e19SJoseph Koshy } 3255ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_NEWVALUE) 3256ebccf1e3SJoseph Koshy pm->pm_gv.pm_savedvalue = prw.pm_value; 3257c5153e19SJoseph Koshy 3258ebccf1e3SJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3259ebccf1e3SJoseph Koshy 3260ebccf1e3SJoseph Koshy } else { /* System mode PMCs */ 3261c5153e19SJoseph Koshy cpu = PMC_TO_CPU(pm); 3262c5153e19SJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 3263ebccf1e3SJoseph Koshy 3264ebccf1e3SJoseph Koshy if (pmc_cpu_is_disabled(cpu)) { 3265ebccf1e3SJoseph Koshy error = ENXIO; 3266ebccf1e3SJoseph Koshy break; 3267ebccf1e3SJoseph Koshy } 3268ebccf1e3SJoseph Koshy 3269ebccf1e3SJoseph Koshy /* move this thread to CPU 'cpu' */ 3270ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 3271ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 3272ebccf1e3SJoseph Koshy 3273c5153e19SJoseph Koshy critical_enter(); 3274ebccf1e3SJoseph Koshy /* save old value */ 3275ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_OLDVALUE) 3276ebccf1e3SJoseph Koshy if ((error = (*md->pmd_read_pmc)(cpu, ri, 3277ebccf1e3SJoseph Koshy &oldvalue))) 3278ebccf1e3SJoseph Koshy goto error; 3279ebccf1e3SJoseph Koshy /* write out new value */ 3280ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_NEWVALUE) 3281ebccf1e3SJoseph Koshy error = (*md->pmd_write_pmc)(cpu, ri, 3282ebccf1e3SJoseph Koshy prw.pm_value); 3283ebccf1e3SJoseph Koshy error: 3284c5153e19SJoseph Koshy critical_exit(); 3285ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 3286ebccf1e3SJoseph Koshy if (error) 3287ebccf1e3SJoseph Koshy break; 3288ebccf1e3SJoseph Koshy } 3289ebccf1e3SJoseph Koshy 3290ebccf1e3SJoseph Koshy pprw = (struct pmc_op_pmcrw *) arg; 3291ebccf1e3SJoseph Koshy 3292342ed5d9SRuslan Ermilov #ifdef DEBUG 3293ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_NEWVALUE) 3294ebccf1e3SJoseph Koshy PMCDBG(PMC,OPS,2, "rw id=%d new %jx -> old %jx", 3295ebccf1e3SJoseph Koshy ri, prw.pm_value, oldvalue); 3296ebccf1e3SJoseph Koshy else 3297ebccf1e3SJoseph Koshy PMCDBG(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue); 3298ebccf1e3SJoseph Koshy #endif 3299ebccf1e3SJoseph Koshy 3300ebccf1e3SJoseph Koshy /* return old value if requested */ 3301ebccf1e3SJoseph Koshy if (prw.pm_flags & PMC_F_OLDVALUE) 3302ebccf1e3SJoseph Koshy if ((error = copyout(&oldvalue, &pprw->pm_value, 3303ebccf1e3SJoseph Koshy sizeof(prw.pm_value)))) 3304ebccf1e3SJoseph Koshy break; 3305ebccf1e3SJoseph Koshy 3306ebccf1e3SJoseph Koshy } 3307ebccf1e3SJoseph Koshy break; 3308ebccf1e3SJoseph Koshy 3309ebccf1e3SJoseph Koshy 3310ebccf1e3SJoseph Koshy /* 3311ebccf1e3SJoseph Koshy * Set the sampling rate for a sampling mode PMC and the 3312ebccf1e3SJoseph Koshy * initial count for a counting mode PMC. 3313ebccf1e3SJoseph Koshy */ 3314ebccf1e3SJoseph Koshy 3315ebccf1e3SJoseph Koshy case PMC_OP_PMCSETCOUNT: 3316ebccf1e3SJoseph Koshy { 3317ebccf1e3SJoseph Koshy struct pmc *pm; 3318ebccf1e3SJoseph Koshy struct pmc_op_pmcsetcount sc; 3319ebccf1e3SJoseph Koshy 3320ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 3321ebccf1e3SJoseph Koshy 3322ebccf1e3SJoseph Koshy if ((error = copyin(arg, &sc, sizeof(sc))) != 0) 3323ebccf1e3SJoseph Koshy break; 3324ebccf1e3SJoseph Koshy 3325ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0) 3326ebccf1e3SJoseph Koshy break; 3327ebccf1e3SJoseph Koshy 3328ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING) { 3329ebccf1e3SJoseph Koshy error = EBUSY; 3330ebccf1e3SJoseph Koshy break; 3331ebccf1e3SJoseph Koshy } 3332ebccf1e3SJoseph Koshy 3333c5153e19SJoseph Koshy if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 3334ebccf1e3SJoseph Koshy pm->pm_sc.pm_reloadcount = sc.pm_count; 3335ebccf1e3SJoseph Koshy else 3336ebccf1e3SJoseph Koshy pm->pm_sc.pm_initial = sc.pm_count; 3337ebccf1e3SJoseph Koshy } 3338ebccf1e3SJoseph Koshy break; 3339ebccf1e3SJoseph Koshy 3340ebccf1e3SJoseph Koshy 3341ebccf1e3SJoseph Koshy /* 3342ebccf1e3SJoseph Koshy * Start a PMC. 3343ebccf1e3SJoseph Koshy */ 3344ebccf1e3SJoseph Koshy 3345ebccf1e3SJoseph Koshy case PMC_OP_PMCSTART: 3346ebccf1e3SJoseph Koshy { 3347ebccf1e3SJoseph Koshy pmc_id_t pmcid; 3348ebccf1e3SJoseph Koshy struct pmc *pm; 3349ebccf1e3SJoseph Koshy struct pmc_op_simple sp; 3350ebccf1e3SJoseph Koshy 3351ebccf1e3SJoseph Koshy sx_assert(&pmc_sx, SX_XLOCKED); 3352ebccf1e3SJoseph Koshy 3353ebccf1e3SJoseph Koshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3354ebccf1e3SJoseph Koshy break; 3355ebccf1e3SJoseph Koshy 3356ebccf1e3SJoseph Koshy pmcid = sp.pm_pmcid; 3357ebccf1e3SJoseph Koshy 3358ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3359ebccf1e3SJoseph Koshy break; 3360ebccf1e3SJoseph Koshy 3361c5153e19SJoseph Koshy KASSERT(pmcid == pm->pm_id, 3362c5153e19SJoseph Koshy ("[pmc,%d] pmcid %x != id %x", __LINE__, 3363c5153e19SJoseph Koshy pm->pm_id, pmcid)); 3364ebccf1e3SJoseph Koshy 3365ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING) /* already running */ 3366ebccf1e3SJoseph Koshy break; 3367ebccf1e3SJoseph Koshy else if (pm->pm_state != PMC_STATE_STOPPED && 3368ebccf1e3SJoseph Koshy pm->pm_state != PMC_STATE_ALLOCATED) { 3369ebccf1e3SJoseph Koshy error = EINVAL; 3370ebccf1e3SJoseph Koshy break; 3371ebccf1e3SJoseph Koshy } 3372ebccf1e3SJoseph Koshy 3373ebccf1e3SJoseph Koshy error = pmc_start(pm); 3374ebccf1e3SJoseph Koshy } 3375ebccf1e3SJoseph Koshy break; 3376ebccf1e3SJoseph Koshy 3377ebccf1e3SJoseph Koshy 3378ebccf1e3SJoseph Koshy /* 3379ebccf1e3SJoseph Koshy * Stop a PMC. 3380ebccf1e3SJoseph Koshy */ 3381ebccf1e3SJoseph Koshy 3382ebccf1e3SJoseph Koshy case PMC_OP_PMCSTOP: 3383ebccf1e3SJoseph Koshy { 3384ebccf1e3SJoseph Koshy pmc_id_t pmcid; 3385ebccf1e3SJoseph Koshy struct pmc *pm; 3386ebccf1e3SJoseph Koshy struct pmc_op_simple sp; 3387ebccf1e3SJoseph Koshy 3388ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 3389ebccf1e3SJoseph Koshy 3390ebccf1e3SJoseph Koshy if ((error = copyin(arg, &sp, sizeof(sp))) != 0) 3391ebccf1e3SJoseph Koshy break; 3392ebccf1e3SJoseph Koshy 3393ebccf1e3SJoseph Koshy pmcid = sp.pm_pmcid; 3394ebccf1e3SJoseph Koshy 3395ebccf1e3SJoseph Koshy /* 3396ebccf1e3SJoseph Koshy * Mark the PMC as inactive and invoke the MD stop 3397ebccf1e3SJoseph Koshy * routines if needed. 3398ebccf1e3SJoseph Koshy */ 3399ebccf1e3SJoseph Koshy 3400ebccf1e3SJoseph Koshy if ((error = pmc_find_pmc(pmcid, &pm)) != 0) 3401ebccf1e3SJoseph Koshy break; 3402ebccf1e3SJoseph Koshy 3403c5153e19SJoseph Koshy KASSERT(pmcid == pm->pm_id, 3404c5153e19SJoseph Koshy ("[pmc,%d] pmc id %x != pmcid %x", __LINE__, 3405c5153e19SJoseph Koshy pm->pm_id, pmcid)); 3406ebccf1e3SJoseph Koshy 3407ebccf1e3SJoseph Koshy if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */ 3408ebccf1e3SJoseph Koshy break; 3409ebccf1e3SJoseph Koshy else if (pm->pm_state != PMC_STATE_RUNNING) { 3410ebccf1e3SJoseph Koshy error = EINVAL; 3411ebccf1e3SJoseph Koshy break; 3412ebccf1e3SJoseph Koshy } 3413ebccf1e3SJoseph Koshy 3414ebccf1e3SJoseph Koshy error = pmc_stop(pm); 3415ebccf1e3SJoseph Koshy } 3416ebccf1e3SJoseph Koshy break; 3417ebccf1e3SJoseph Koshy 3418ebccf1e3SJoseph Koshy 3419ebccf1e3SJoseph Koshy /* 3420fbf1556dSJoseph Koshy * Write a user supplied value to the log file. 3421ebccf1e3SJoseph Koshy */ 3422ebccf1e3SJoseph Koshy 3423ebccf1e3SJoseph Koshy case PMC_OP_WRITELOG: 3424ebccf1e3SJoseph Koshy { 3425f263522aSJoseph Koshy struct pmc_op_writelog wl; 3426f263522aSJoseph Koshy struct pmc_owner *po; 3427ebccf1e3SJoseph Koshy 3428ebccf1e3SJoseph Koshy PMC_DOWNGRADE_SX(); 3429ebccf1e3SJoseph Koshy 3430f263522aSJoseph Koshy if ((error = copyin(arg, &wl, sizeof(wl))) != 0) 3431ebccf1e3SJoseph Koshy break; 3432ebccf1e3SJoseph Koshy 3433f263522aSJoseph Koshy if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) { 3434ebccf1e3SJoseph Koshy error = EINVAL; 3435ebccf1e3SJoseph Koshy break; 3436ebccf1e3SJoseph Koshy } 3437ebccf1e3SJoseph Koshy 3438f263522aSJoseph Koshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 3439c5153e19SJoseph Koshy error = EINVAL; 3440c5153e19SJoseph Koshy break; 3441c5153e19SJoseph Koshy } 3442c5153e19SJoseph Koshy 3443f263522aSJoseph Koshy error = pmclog_process_userlog(po, &wl); 3444ebccf1e3SJoseph Koshy } 3445ebccf1e3SJoseph Koshy break; 3446f263522aSJoseph Koshy 3447ebccf1e3SJoseph Koshy 3448ebccf1e3SJoseph Koshy default: 3449ebccf1e3SJoseph Koshy error = EINVAL; 3450ebccf1e3SJoseph Koshy break; 3451ebccf1e3SJoseph Koshy } 3452ebccf1e3SJoseph Koshy 3453ebccf1e3SJoseph Koshy if (is_sx_downgraded) 3454ebccf1e3SJoseph Koshy sx_sunlock(&pmc_sx); 3455ebccf1e3SJoseph Koshy else 3456ebccf1e3SJoseph Koshy sx_xunlock(&pmc_sx); 3457ebccf1e3SJoseph Koshy 3458ebccf1e3SJoseph Koshy if (error) 3459ebccf1e3SJoseph Koshy atomic_add_int(&pmc_stats.pm_syscall_errors, 1); 3460ebccf1e3SJoseph Koshy 3461f263522aSJoseph Koshy PICKUP_GIANT(); 3462f263522aSJoseph Koshy 3463ebccf1e3SJoseph Koshy return error; 3464ebccf1e3SJoseph Koshy } 3465ebccf1e3SJoseph Koshy 3466ebccf1e3SJoseph Koshy /* 3467ebccf1e3SJoseph Koshy * Helper functions 3468ebccf1e3SJoseph Koshy */ 3469ebccf1e3SJoseph Koshy 3470f263522aSJoseph Koshy 3471ebccf1e3SJoseph Koshy /* 3472f263522aSJoseph Koshy * Interrupt processing. 3473f263522aSJoseph Koshy * 3474f263522aSJoseph Koshy * Find a free slot in the per-cpu array of PC samples and write the 3475f263522aSJoseph Koshy * current (PMC,PID,PC) triple to it. If an event was successfully 3476f263522aSJoseph Koshy * added, a bit is set in mask 'pmc_cpumask' denoting that the 3477f263522aSJoseph Koshy * DO_SAMPLES hook needs to be invoked from the clock handler. 3478f263522aSJoseph Koshy * 3479f263522aSJoseph Koshy * This function is meant to be called from an NMI handler. It cannot 3480f263522aSJoseph Koshy * use any of the locking primitives supplied by the OS. 3481ebccf1e3SJoseph Koshy */ 3482ebccf1e3SJoseph Koshy 3483f263522aSJoseph Koshy int 348415139246SJoseph Koshy pmc_process_interrupt(int cpu, struct pmc *pm, uintfptr_t pc, int usermode) 3485ebccf1e3SJoseph Koshy { 3486f263522aSJoseph Koshy int error, ri; 3487f263522aSJoseph Koshy struct thread *td; 3488f263522aSJoseph Koshy struct pmc_sample *ps; 3489f263522aSJoseph Koshy struct pmc_samplebuffer *psb; 3490ebccf1e3SJoseph Koshy 3491f263522aSJoseph Koshy error = 0; 3492f263522aSJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 3493ebccf1e3SJoseph Koshy 3494f263522aSJoseph Koshy psb = pmc_pcpu[cpu]->pc_sb; 3495ebccf1e3SJoseph Koshy 3496f263522aSJoseph Koshy ps = psb->ps_write; 3497f263522aSJoseph Koshy if (ps->ps_pc) { /* in use, reader hasn't caught up */ 3498fbf1556dSJoseph Koshy pm->pm_stalled = 1; 3499f263522aSJoseph Koshy atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1); 3500f263522aSJoseph Koshy PMCDBG(SAM,INT,1,"(spc) cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", 350115139246SJoseph Koshy cpu, pm, (uint64_t) pc, usermode, 3502f263522aSJoseph Koshy (int) (psb->ps_write - psb->ps_samples), 3503f263522aSJoseph Koshy (int) (psb->ps_read - psb->ps_samples)); 3504f263522aSJoseph Koshy error = ENOMEM; 3505f263522aSJoseph Koshy goto done; 3506ebccf1e3SJoseph Koshy } 3507ebccf1e3SJoseph Koshy 3508f263522aSJoseph Koshy /* fill in entry */ 3509f263522aSJoseph Koshy PMCDBG(SAM,INT,1,"cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", cpu, pm, 351015139246SJoseph Koshy (uint64_t) pc, usermode, 3511f263522aSJoseph Koshy (int) (psb->ps_write - psb->ps_samples), 3512f263522aSJoseph Koshy (int) (psb->ps_read - psb->ps_samples)); 3513f263522aSJoseph Koshy 3514f263522aSJoseph Koshy atomic_add_rel_32(&pm->pm_runcount, 1); /* hold onto PMC */ 3515f263522aSJoseph Koshy ps->ps_pmc = pm; 3516f263522aSJoseph Koshy if ((td = curthread) && td->td_proc) 3517f263522aSJoseph Koshy ps->ps_pid = td->td_proc->p_pid; 3518f263522aSJoseph Koshy else 3519f263522aSJoseph Koshy ps->ps_pid = -1; 3520f263522aSJoseph Koshy ps->ps_usermode = usermode; 3521f263522aSJoseph Koshy ps->ps_pc = pc; /* mark entry as in use */ 3522f263522aSJoseph Koshy 3523f263522aSJoseph Koshy /* increment write pointer, modulo ring buffer size */ 3524f263522aSJoseph Koshy ps++; 3525f263522aSJoseph Koshy if (ps == psb->ps_fence) 3526f263522aSJoseph Koshy psb->ps_write = psb->ps_samples; 3527f263522aSJoseph Koshy else 3528f263522aSJoseph Koshy psb->ps_write = ps; 3529f263522aSJoseph Koshy 3530f263522aSJoseph Koshy done: 3531f263522aSJoseph Koshy /* mark CPU as needing processing */ 3532f263522aSJoseph Koshy atomic_set_rel_int(&pmc_cpumask, (1 << cpu)); 3533f263522aSJoseph Koshy 3534f263522aSJoseph Koshy return error; 3535f263522aSJoseph Koshy } 3536f263522aSJoseph Koshy 3537f263522aSJoseph Koshy 3538ebccf1e3SJoseph Koshy /* 3539f263522aSJoseph Koshy * Process saved PC samples. 3540ebccf1e3SJoseph Koshy */ 3541ebccf1e3SJoseph Koshy 3542ebccf1e3SJoseph Koshy static void 3543f263522aSJoseph Koshy pmc_process_samples(int cpu) 3544ebccf1e3SJoseph Koshy { 3545f263522aSJoseph Koshy int n, ri; 3546f263522aSJoseph Koshy struct pmc *pm; 3547f263522aSJoseph Koshy struct thread *td; 3548f263522aSJoseph Koshy struct pmc_owner *po; 3549f263522aSJoseph Koshy struct pmc_sample *ps; 3550f263522aSJoseph Koshy struct pmc_samplebuffer *psb; 3551ebccf1e3SJoseph Koshy 3552f263522aSJoseph Koshy KASSERT(PCPU_GET(cpuid) == cpu, 3553f263522aSJoseph Koshy ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__, 3554f263522aSJoseph Koshy PCPU_GET(cpuid), cpu)); 3555ebccf1e3SJoseph Koshy 3556f263522aSJoseph Koshy psb = pmc_pcpu[cpu]->pc_sb; 3557f263522aSJoseph Koshy 3558f263522aSJoseph Koshy for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */ 3559f263522aSJoseph Koshy 3560f263522aSJoseph Koshy ps = psb->ps_read; 3561f263522aSJoseph Koshy if (ps->ps_pc == (uintfptr_t) 0) /* no data */ 3562f263522aSJoseph Koshy break; 3563f263522aSJoseph Koshy 3564f263522aSJoseph Koshy pm = ps->ps_pmc; 3565f263522aSJoseph Koshy po = pm->pm_owner; 3566f263522aSJoseph Koshy 3567f263522aSJoseph Koshy KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)), 3568f263522aSJoseph Koshy ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__, 3569f263522aSJoseph Koshy pm, PMC_TO_MODE(pm))); 3570f263522aSJoseph Koshy 3571f263522aSJoseph Koshy /* Ignore PMCs that have been switched off */ 3572f263522aSJoseph Koshy if (pm->pm_state != PMC_STATE_RUNNING) 3573f263522aSJoseph Koshy goto entrydone; 3574f263522aSJoseph Koshy 3575f263522aSJoseph Koshy PMCDBG(SAM,OPS,1,"cpu=%d pm=%p pc=%jx um=%d wr=%d rd=%d", cpu, 357615139246SJoseph Koshy pm, (uint64_t) ps->ps_pc, ps->ps_usermode, 3577f263522aSJoseph Koshy (int) (psb->ps_write - psb->ps_samples), 3578f263522aSJoseph Koshy (int) (psb->ps_read - psb->ps_samples)); 3579f263522aSJoseph Koshy 3580f263522aSJoseph Koshy /* 3581f263522aSJoseph Koshy * If this is a process-mode PMC that is attached to 3582f263522aSJoseph Koshy * its owner, and if the PC is in user mode, update 3583f263522aSJoseph Koshy * profiling statistics like timer-based profiling 3584f263522aSJoseph Koshy * would have done. 3585f263522aSJoseph Koshy */ 3586f263522aSJoseph Koshy if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) { 3587f263522aSJoseph Koshy if (ps->ps_usermode) { 3588f263522aSJoseph Koshy td = FIRST_THREAD_IN_PROC(po->po_owner); 3589f263522aSJoseph Koshy addupc_intr(td, ps->ps_pc, 1); 3590f263522aSJoseph Koshy } 3591f263522aSJoseph Koshy goto entrydone; 3592f263522aSJoseph Koshy } 3593f263522aSJoseph Koshy 3594f263522aSJoseph Koshy /* 3595f263522aSJoseph Koshy * Otherwise, this is either a sampling mode PMC that 3596f263522aSJoseph Koshy * is attached to a different process than its owner, 3597f263522aSJoseph Koshy * or a system-wide sampling PMC. Dispatch a log 3598f263522aSJoseph Koshy * entry to the PMC's owner process. 3599f263522aSJoseph Koshy */ 3600f263522aSJoseph Koshy 3601f263522aSJoseph Koshy pmclog_process_pcsample(pm, ps); 3602f263522aSJoseph Koshy 3603f263522aSJoseph Koshy entrydone: 3604f263522aSJoseph Koshy ps->ps_pc = (uintfptr_t) 0; /* mark entry as free */ 3605f263522aSJoseph Koshy atomic_subtract_rel_32(&pm->pm_runcount, 1); 3606f263522aSJoseph Koshy 3607f263522aSJoseph Koshy /* increment read pointer, modulo sample size */ 3608f263522aSJoseph Koshy if (++ps == psb->ps_fence) 3609f263522aSJoseph Koshy psb->ps_read = psb->ps_samples; 3610f263522aSJoseph Koshy else 3611f263522aSJoseph Koshy psb->ps_read = ps; 3612f263522aSJoseph Koshy } 3613f263522aSJoseph Koshy 3614f263522aSJoseph Koshy atomic_add_int(&pmc_stats.pm_log_sweeps, 1); 3615f263522aSJoseph Koshy 3616f263522aSJoseph Koshy /* Do not re-enable stalled PMCs if we failed to process any samples */ 3617f263522aSJoseph Koshy if (n == 0) 3618ebccf1e3SJoseph Koshy return; 3619f263522aSJoseph Koshy 3620f263522aSJoseph Koshy /* 3621f263522aSJoseph Koshy * Restart any stalled sampling PMCs on this CPU. 3622f263522aSJoseph Koshy * 3623fbf1556dSJoseph Koshy * If the NMI handler sets the pm_stalled field of a PMC after 3624fbf1556dSJoseph Koshy * the check below, we'll end up processing the stalled PMC at 3625fbf1556dSJoseph Koshy * the next hardclock tick. 3626f263522aSJoseph Koshy */ 3627f263522aSJoseph Koshy for (n = 0; n < md->pmd_npmc; n++) { 3628f263522aSJoseph Koshy (void) (*md->pmd_get_config)(cpu,n,&pm); 3629f263522aSJoseph Koshy if (pm == NULL || /* !cfg'ed */ 3630f263522aSJoseph Koshy pm->pm_state != PMC_STATE_RUNNING || /* !active */ 3631f263522aSJoseph Koshy !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */ 3632fbf1556dSJoseph Koshy pm->pm_stalled == 0) /* !stalled */ 3633f263522aSJoseph Koshy continue; 3634f263522aSJoseph Koshy 3635fbf1556dSJoseph Koshy pm->pm_stalled = 0; 3636f263522aSJoseph Koshy ri = PMC_TO_ROWINDEX(pm); 3637f263522aSJoseph Koshy (*md->pmd_start_pmc)(cpu, ri); 3638f263522aSJoseph Koshy } 3639ebccf1e3SJoseph Koshy } 3640ebccf1e3SJoseph Koshy 3641ebccf1e3SJoseph Koshy /* 3642ebccf1e3SJoseph Koshy * Event handlers. 3643ebccf1e3SJoseph Koshy */ 3644ebccf1e3SJoseph Koshy 3645ebccf1e3SJoseph Koshy /* 3646ebccf1e3SJoseph Koshy * Handle a process exit. 3647ebccf1e3SJoseph Koshy * 3648f263522aSJoseph Koshy * Remove this process from all hash tables. If this process 3649f263522aSJoseph Koshy * owned any PMCs, turn off those PMCs and deallocate them, 3650f263522aSJoseph Koshy * removing any associations with target processes. 3651f263522aSJoseph Koshy * 3652f263522aSJoseph Koshy * This function will be called by the last 'thread' of a 3653f263522aSJoseph Koshy * process. 3654f263522aSJoseph Koshy * 3655ebccf1e3SJoseph Koshy * XXX This eventhandler gets called early in the exit process. 3656ebccf1e3SJoseph Koshy * Consider using a 'hook' invocation from thread_exit() or equivalent 3657ebccf1e3SJoseph Koshy * spot. Another negative is that kse_exit doesn't seem to call 3658ebccf1e3SJoseph Koshy * exit1() [??]. 3659f263522aSJoseph Koshy * 3660ebccf1e3SJoseph Koshy */ 3661ebccf1e3SJoseph Koshy 3662ebccf1e3SJoseph Koshy static void 3663ebccf1e3SJoseph Koshy pmc_process_exit(void *arg __unused, struct proc *p) 3664ebccf1e3SJoseph Koshy { 3665ebccf1e3SJoseph Koshy int is_using_hwpmcs; 3666f263522aSJoseph Koshy int cpu; 3667f263522aSJoseph Koshy unsigned int ri; 3668f263522aSJoseph Koshy struct pmc *pm; 3669f263522aSJoseph Koshy struct pmc_process *pp; 3670f263522aSJoseph Koshy struct pmc_owner *po; 3671f263522aSJoseph Koshy pmc_value_t newvalue, tmp; 3672ebccf1e3SJoseph Koshy 3673ebccf1e3SJoseph Koshy PROC_LOCK(p); 3674ebccf1e3SJoseph Koshy is_using_hwpmcs = p->p_flag & P_HWPMC; 3675ebccf1e3SJoseph Koshy PROC_UNLOCK(p); 3676ebccf1e3SJoseph Koshy 3677f263522aSJoseph Koshy /* 3678f263522aSJoseph Koshy * Log a sysexit event to all SS PMC owners. 3679f263522aSJoseph Koshy */ 3680f263522aSJoseph Koshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 3681f263522aSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 3682f263522aSJoseph Koshy pmclog_process_sysexit(po, p->p_pid); 3683f263522aSJoseph Koshy 3684f263522aSJoseph Koshy if (!is_using_hwpmcs) 3685f263522aSJoseph Koshy return; 3686f263522aSJoseph Koshy 3687f263522aSJoseph Koshy PMC_GET_SX_XLOCK(); 3688ebccf1e3SJoseph Koshy PMCDBG(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid, 3689ebccf1e3SJoseph Koshy p->p_comm); 3690ebccf1e3SJoseph Koshy 3691f263522aSJoseph Koshy /* 3692f263522aSJoseph Koshy * Since this code is invoked by the last thread in an exiting 3693f263522aSJoseph Koshy * process, we would have context switched IN at some prior 3694f263522aSJoseph Koshy * point. However, with PREEMPTION, kernel mode context 3695f263522aSJoseph Koshy * switches may happen any time, so we want to disable a 3696f263522aSJoseph Koshy * context switch OUT till we get any PMCs targetting this 3697f263522aSJoseph Koshy * process off the hardware. 3698f263522aSJoseph Koshy * 3699f263522aSJoseph Koshy * We also need to atomically remove this process' 3700f263522aSJoseph Koshy * entry from our target process hash table, using 3701f263522aSJoseph Koshy * PMC_FLAG_REMOVE. 3702f263522aSJoseph Koshy */ 3703f263522aSJoseph Koshy PMCDBG(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid, 3704f263522aSJoseph Koshy p->p_comm); 3705f263522aSJoseph Koshy 3706f263522aSJoseph Koshy critical_enter(); /* no preemption */ 3707f263522aSJoseph Koshy 3708f263522aSJoseph Koshy cpu = curthread->td_oncpu; 3709f263522aSJoseph Koshy 3710f263522aSJoseph Koshy if ((pp = pmc_find_process_descriptor(p, 3711f263522aSJoseph Koshy PMC_FLAG_REMOVE)) != NULL) { 3712f263522aSJoseph Koshy 3713f263522aSJoseph Koshy PMCDBG(PRC,EXT,2, 3714f263522aSJoseph Koshy "process-exit proc=%p pmc-process=%p", p, pp); 3715f263522aSJoseph Koshy 3716f263522aSJoseph Koshy /* 3717f263522aSJoseph Koshy * The exiting process could the target of 3718f263522aSJoseph Koshy * some PMCs which will be running on 3719f263522aSJoseph Koshy * currently executing CPU. 3720f263522aSJoseph Koshy * 3721f263522aSJoseph Koshy * We need to turn these PMCs off like we 3722f263522aSJoseph Koshy * would do at context switch OUT time. 3723f263522aSJoseph Koshy */ 3724f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) { 3725f263522aSJoseph Koshy 3726f263522aSJoseph Koshy /* 3727f263522aSJoseph Koshy * Pick up the pmc pointer from hardware 3728f263522aSJoseph Koshy * state similar to the CSW_OUT code. 3729f263522aSJoseph Koshy */ 3730f263522aSJoseph Koshy pm = NULL; 3731f263522aSJoseph Koshy (void) (*md->pmd_get_config)(cpu, ri, &pm); 3732f263522aSJoseph Koshy 3733f263522aSJoseph Koshy PMCDBG(PRC,EXT,2, "ri=%d pm=%p", ri, pm); 3734f263522aSJoseph Koshy 3735f263522aSJoseph Koshy if (pm == NULL || 3736f263522aSJoseph Koshy !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) 3737f263522aSJoseph Koshy continue; 3738f263522aSJoseph Koshy 3739f263522aSJoseph Koshy PMCDBG(PRC,EXT,2, "ppmcs[%d]=%p pm=%p " 3740f263522aSJoseph Koshy "state=%d", ri, pp->pp_pmcs[ri].pp_pmc, 3741f263522aSJoseph Koshy pm, pm->pm_state); 3742f263522aSJoseph Koshy 3743f263522aSJoseph Koshy KASSERT(PMC_TO_ROWINDEX(pm) == ri, 3744f263522aSJoseph Koshy ("[pmc,%d] ri mismatch pmc(%d) ri(%d)", 3745f263522aSJoseph Koshy __LINE__, PMC_TO_ROWINDEX(pm), ri)); 3746f263522aSJoseph Koshy 3747f263522aSJoseph Koshy KASSERT(pm == pp->pp_pmcs[ri].pp_pmc, 3748f263522aSJoseph Koshy ("[pmc,%d] pm %p != pp_pmcs[%d] %p", 3749f263522aSJoseph Koshy __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc)); 3750f263522aSJoseph Koshy 3751f263522aSJoseph Koshy (void) md->pmd_stop_pmc(cpu, ri); 3752f263522aSJoseph Koshy 3753f263522aSJoseph Koshy KASSERT(pm->pm_runcount > 0, 3754f263522aSJoseph Koshy ("[pmc,%d] bad runcount ri %d rc %d", 3755f263522aSJoseph Koshy __LINE__, ri, pm->pm_runcount)); 3756f263522aSJoseph Koshy 3757fbf1556dSJoseph Koshy /* Stop hardware only if it is actually running */ 3758f263522aSJoseph Koshy if (pm->pm_state == PMC_STATE_RUNNING && 3759fbf1556dSJoseph Koshy pm->pm_stalled == 0) { 3760f263522aSJoseph Koshy md->pmd_read_pmc(cpu, ri, &newvalue); 3761f263522aSJoseph Koshy tmp = newvalue - 3762f263522aSJoseph Koshy PMC_PCPU_SAVED(cpu,ri); 3763f263522aSJoseph Koshy 3764f263522aSJoseph Koshy mtx_pool_lock_spin(pmc_mtxpool, pm); 3765f263522aSJoseph Koshy pm->pm_gv.pm_savedvalue += tmp; 3766f263522aSJoseph Koshy pp->pp_pmcs[ri].pp_pmcval += tmp; 3767f263522aSJoseph Koshy mtx_pool_unlock_spin(pmc_mtxpool, pm); 3768ebccf1e3SJoseph Koshy } 3769f263522aSJoseph Koshy 3770f263522aSJoseph Koshy atomic_subtract_rel_32(&pm->pm_runcount,1); 3771f263522aSJoseph Koshy 3772f263522aSJoseph Koshy KASSERT((int) pm->pm_runcount >= 0, 3773f263522aSJoseph Koshy ("[pmc,%d] runcount is %d", __LINE__, ri)); 3774f263522aSJoseph Koshy 3775f263522aSJoseph Koshy (void) md->pmd_config_pmc(cpu, ri, NULL); 3776f263522aSJoseph Koshy } 3777f263522aSJoseph Koshy 3778f263522aSJoseph Koshy /* 3779f263522aSJoseph Koshy * Inform the MD layer of this pseudo "context switch 3780f263522aSJoseph Koshy * out" 3781f263522aSJoseph Koshy */ 3782f263522aSJoseph Koshy (void) md->pmd_switch_out(pmc_pcpu[cpu], pp); 3783f263522aSJoseph Koshy 3784f263522aSJoseph Koshy critical_exit(); /* ok to be pre-empted now */ 3785f263522aSJoseph Koshy 3786f263522aSJoseph Koshy /* 3787f263522aSJoseph Koshy * Unlink this process from the PMCs that are 3788f263522aSJoseph Koshy * targetting it. This will send a signal to 3789f263522aSJoseph Koshy * all PMC owner's whose PMCs are orphaned. 3790f263522aSJoseph Koshy * 3791f263522aSJoseph Koshy * Log PMC value at exit time if requested. 3792f263522aSJoseph Koshy */ 3793f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 3794f263522aSJoseph Koshy if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) { 3795fbf1556dSJoseph Koshy if (pm->pm_flags & PMC_F_NEEDS_LOGFILE && 3796fbf1556dSJoseph Koshy PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm))) 3797f263522aSJoseph Koshy pmclog_process_procexit(pm, pp); 3798f263522aSJoseph Koshy pmc_unlink_target_process(pm, pp); 3799f263522aSJoseph Koshy } 3800f263522aSJoseph Koshy FREE(pp, M_PMC); 3801f263522aSJoseph Koshy 3802f263522aSJoseph Koshy } else 3803f263522aSJoseph Koshy critical_exit(); /* pp == NULL */ 3804f263522aSJoseph Koshy 3805f263522aSJoseph Koshy 3806f263522aSJoseph Koshy /* 3807f263522aSJoseph Koshy * If the process owned PMCs, free them up and free up 3808f263522aSJoseph Koshy * memory. 3809f263522aSJoseph Koshy */ 3810f263522aSJoseph Koshy if ((po = pmc_find_owner_descriptor(p)) != NULL) { 3811f263522aSJoseph Koshy pmc_remove_owner(po); 3812f263522aSJoseph Koshy pmc_destroy_owner_descriptor(po); 3813f263522aSJoseph Koshy } 3814f263522aSJoseph Koshy 3815f263522aSJoseph Koshy sx_xunlock(&pmc_sx); 3816ebccf1e3SJoseph Koshy } 3817ebccf1e3SJoseph Koshy 3818ebccf1e3SJoseph Koshy /* 3819ebccf1e3SJoseph Koshy * Handle a process fork. 3820ebccf1e3SJoseph Koshy * 3821ebccf1e3SJoseph Koshy * If the parent process 'p1' is under HWPMC monitoring, then copy 3822ebccf1e3SJoseph Koshy * over any attached PMCs that have 'do_descendants' semantics. 3823ebccf1e3SJoseph Koshy */ 3824ebccf1e3SJoseph Koshy 3825ebccf1e3SJoseph Koshy static void 3826f263522aSJoseph Koshy pmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc, 3827ebccf1e3SJoseph Koshy int flags) 3828ebccf1e3SJoseph Koshy { 3829ebccf1e3SJoseph Koshy int is_using_hwpmcs; 3830f263522aSJoseph Koshy unsigned int ri; 3831f263522aSJoseph Koshy uint32_t do_descendants; 3832f263522aSJoseph Koshy struct pmc *pm; 3833f263522aSJoseph Koshy struct pmc_owner *po; 3834f263522aSJoseph Koshy struct pmc_process *ppnew, *ppold; 3835ebccf1e3SJoseph Koshy 3836ebccf1e3SJoseph Koshy (void) flags; /* unused parameter */ 3837ebccf1e3SJoseph Koshy 3838ebccf1e3SJoseph Koshy PROC_LOCK(p1); 3839ebccf1e3SJoseph Koshy is_using_hwpmcs = p1->p_flag & P_HWPMC; 3840ebccf1e3SJoseph Koshy PROC_UNLOCK(p1); 3841ebccf1e3SJoseph Koshy 3842f263522aSJoseph Koshy /* 3843f263522aSJoseph Koshy * If there are system-wide sampling PMCs active, we need to 3844f263522aSJoseph Koshy * log all fork events to their owner's logs. 3845f263522aSJoseph Koshy */ 3846f263522aSJoseph Koshy 3847f263522aSJoseph Koshy LIST_FOREACH(po, &pmc_ss_owners, po_ssnext) 3848f263522aSJoseph Koshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 3849f263522aSJoseph Koshy pmclog_process_procfork(po, p1->p_pid, newproc->p_pid); 3850f263522aSJoseph Koshy 3851f263522aSJoseph Koshy if (!is_using_hwpmcs) 3852f263522aSJoseph Koshy return; 3853f263522aSJoseph Koshy 3854ebccf1e3SJoseph Koshy PMC_GET_SX_XLOCK(); 3855f263522aSJoseph Koshy PMCDBG(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1, 3856f263522aSJoseph Koshy p1->p_pid, p1->p_comm, newproc); 3857f263522aSJoseph Koshy 3858f263522aSJoseph Koshy /* 3859f263522aSJoseph Koshy * If the parent process (curthread->td_proc) is a 3860f263522aSJoseph Koshy * target of any PMCs, look for PMCs that are to be 3861f263522aSJoseph Koshy * inherited, and link these into the new process 3862f263522aSJoseph Koshy * descriptor. 3863f263522aSJoseph Koshy */ 3864f263522aSJoseph Koshy if ((ppold = pmc_find_process_descriptor(curthread->td_proc, 3865f263522aSJoseph Koshy PMC_FLAG_NONE)) == NULL) 3866f263522aSJoseph Koshy goto done; /* nothing to do */ 3867f263522aSJoseph Koshy 3868f263522aSJoseph Koshy do_descendants = 0; 3869f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 3870f263522aSJoseph Koshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL) 3871f263522aSJoseph Koshy do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS; 3872f263522aSJoseph Koshy if (do_descendants == 0) /* nothing to do */ 3873f263522aSJoseph Koshy goto done; 3874f263522aSJoseph Koshy 3875f263522aSJoseph Koshy /* allocate a descriptor for the new process */ 3876f263522aSJoseph Koshy if ((ppnew = pmc_find_process_descriptor(newproc, 3877f263522aSJoseph Koshy PMC_FLAG_ALLOCATE)) == NULL) 3878f263522aSJoseph Koshy goto done; 3879f263522aSJoseph Koshy 3880f263522aSJoseph Koshy /* 3881f263522aSJoseph Koshy * Run through all PMCs that were targeting the old process 3882f263522aSJoseph Koshy * and which specified F_DESCENDANTS and attach them to the 3883f263522aSJoseph Koshy * new process. 3884f263522aSJoseph Koshy * 3885f263522aSJoseph Koshy * Log the fork event to all owners of PMCs attached to this 3886f263522aSJoseph Koshy * process, if not already logged. 3887f263522aSJoseph Koshy */ 3888f263522aSJoseph Koshy for (ri = 0; ri < md->pmd_npmc; ri++) 3889f263522aSJoseph Koshy if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL && 3890f263522aSJoseph Koshy (pm->pm_flags & PMC_F_DESCENDANTS)) { 3891f263522aSJoseph Koshy pmc_link_target_process(pm, ppnew); 3892f263522aSJoseph Koshy po = pm->pm_owner; 3893f263522aSJoseph Koshy if (po->po_sscount == 0 && 3894f263522aSJoseph Koshy po->po_flags & PMC_PO_OWNS_LOGFILE) 3895f263522aSJoseph Koshy pmclog_process_procfork(po, p1->p_pid, 3896f263522aSJoseph Koshy newproc->p_pid); 3897ebccf1e3SJoseph Koshy } 3898f263522aSJoseph Koshy 3899f263522aSJoseph Koshy /* 3900f263522aSJoseph Koshy * Now mark the new process as being tracked by this driver. 3901f263522aSJoseph Koshy */ 3902f263522aSJoseph Koshy PROC_LOCK(newproc); 3903f263522aSJoseph Koshy newproc->p_flag |= P_HWPMC; 3904f263522aSJoseph Koshy PROC_UNLOCK(newproc); 3905f263522aSJoseph Koshy 3906f263522aSJoseph Koshy done: 3907f263522aSJoseph Koshy sx_xunlock(&pmc_sx); 3908ebccf1e3SJoseph Koshy } 3909ebccf1e3SJoseph Koshy 3910ebccf1e3SJoseph Koshy 3911ebccf1e3SJoseph Koshy /* 3912ebccf1e3SJoseph Koshy * initialization 3913ebccf1e3SJoseph Koshy */ 3914ebccf1e3SJoseph Koshy 3915ebccf1e3SJoseph Koshy static const char *pmc_name_of_pmcclass[] = { 3916ebccf1e3SJoseph Koshy #undef __PMC_CLASS 3917ebccf1e3SJoseph Koshy #define __PMC_CLASS(N) #N , 3918ebccf1e3SJoseph Koshy __PMC_CLASSES() 3919ebccf1e3SJoseph Koshy }; 3920ebccf1e3SJoseph Koshy 3921ebccf1e3SJoseph Koshy static int 3922ebccf1e3SJoseph Koshy pmc_initialize(void) 3923ebccf1e3SJoseph Koshy { 3924f263522aSJoseph Koshy int cpu, error, n; 3925ebccf1e3SJoseph Koshy struct pmc_binding pb; 3926f263522aSJoseph Koshy struct pmc_samplebuffer *sb; 3927ebccf1e3SJoseph Koshy 3928ebccf1e3SJoseph Koshy md = NULL; 3929ebccf1e3SJoseph Koshy error = 0; 3930ebccf1e3SJoseph Koshy 3931342ed5d9SRuslan Ermilov #ifdef DEBUG 3932ebccf1e3SJoseph Koshy /* parse debug flags first */ 3933ebccf1e3SJoseph Koshy if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags", 3934ebccf1e3SJoseph Koshy pmc_debugstr, sizeof(pmc_debugstr))) 3935ebccf1e3SJoseph Koshy pmc_debugflags_parse(pmc_debugstr, 3936ebccf1e3SJoseph Koshy pmc_debugstr+strlen(pmc_debugstr)); 3937ebccf1e3SJoseph Koshy #endif 3938ebccf1e3SJoseph Koshy 3939ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION); 3940ebccf1e3SJoseph Koshy 3941fadcc6e2SJoseph Koshy /* check kernel version */ 3942fadcc6e2SJoseph Koshy if (pmc_kernel_version != PMC_VERSION) { 3943fadcc6e2SJoseph Koshy if (pmc_kernel_version == 0) 3944fadcc6e2SJoseph Koshy printf("hwpmc: this kernel has not been compiled with " 3945fadcc6e2SJoseph Koshy "'options HWPMC_HOOKS'.\n"); 3946fadcc6e2SJoseph Koshy else 3947fadcc6e2SJoseph Koshy printf("hwpmc: kernel version (0x%x) does not match " 3948fadcc6e2SJoseph Koshy "module version (0x%x).\n", pmc_kernel_version, 3949fadcc6e2SJoseph Koshy PMC_VERSION); 3950fadcc6e2SJoseph Koshy return EPROGMISMATCH; 3951fadcc6e2SJoseph Koshy } 3952fadcc6e2SJoseph Koshy 3953ebccf1e3SJoseph Koshy /* 3954ebccf1e3SJoseph Koshy * check sysctl parameters 3955ebccf1e3SJoseph Koshy */ 3956ebccf1e3SJoseph Koshy 3957ebccf1e3SJoseph Koshy if (pmc_hashsize <= 0) { 3958f263522aSJoseph Koshy (void) printf("hwpmc: tunable hashsize=%d must be greater " 3959f263522aSJoseph Koshy "than zero.\n", pmc_hashsize); 3960ebccf1e3SJoseph Koshy pmc_hashsize = PMC_HASH_SIZE; 3961ebccf1e3SJoseph Koshy } 3962ebccf1e3SJoseph Koshy 3963f263522aSJoseph Koshy if (pmc_nsamples <= 0 || pmc_nsamples > 65535) { 3964ba8ae2deSJoseph Koshy (void) printf("hwpmc: tunable nsamples=%d out of range.\n", 3965ba8ae2deSJoseph Koshy pmc_nsamples); 3966f263522aSJoseph Koshy pmc_nsamples = PMC_NSAMPLES; 3967f263522aSJoseph Koshy } 3968f263522aSJoseph Koshy 3969f263522aSJoseph Koshy md = pmc_md_initialize(); 3970ebccf1e3SJoseph Koshy 3971ebccf1e3SJoseph Koshy if (md == NULL || md->pmd_init == NULL) 3972ebccf1e3SJoseph Koshy return ENOSYS; 3973ebccf1e3SJoseph Koshy 3974ebccf1e3SJoseph Koshy /* allocate space for the per-cpu array */ 3975ebccf1e3SJoseph Koshy MALLOC(pmc_pcpu, struct pmc_cpu **, mp_ncpus * sizeof(struct pmc_cpu *), 3976ebccf1e3SJoseph Koshy M_PMC, M_WAITOK|M_ZERO); 3977ebccf1e3SJoseph Koshy 3978ebccf1e3SJoseph Koshy /* per-cpu 'saved values' for managing process-mode PMCs */ 3979ebccf1e3SJoseph Koshy MALLOC(pmc_pcpu_saved, pmc_value_t *, 3980ebccf1e3SJoseph Koshy sizeof(pmc_value_t) * mp_ncpus * md->pmd_npmc, M_PMC, M_WAITOK); 3981ebccf1e3SJoseph Koshy 3982ebccf1e3SJoseph Koshy /* perform cpu dependent initialization */ 3983ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 3984ebccf1e3SJoseph Koshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 3985ebccf1e3SJoseph Koshy if (pmc_cpu_is_disabled(cpu)) 3986ebccf1e3SJoseph Koshy continue; 3987ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 3988ebccf1e3SJoseph Koshy if ((error = md->pmd_init(cpu)) != 0) 3989ebccf1e3SJoseph Koshy break; 3990ebccf1e3SJoseph Koshy } 3991ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 3992ebccf1e3SJoseph Koshy 3993ebccf1e3SJoseph Koshy if (error != 0) 3994ebccf1e3SJoseph Koshy return error; 3995ebccf1e3SJoseph Koshy 3996f263522aSJoseph Koshy /* allocate space for the sample array */ 3997f263522aSJoseph Koshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 3998f263522aSJoseph Koshy if (pmc_cpu_is_disabled(cpu)) 3999f263522aSJoseph Koshy continue; 4000f263522aSJoseph Koshy MALLOC(sb, struct pmc_samplebuffer *, 4001f263522aSJoseph Koshy sizeof(struct pmc_samplebuffer) + 4002f263522aSJoseph Koshy pmc_nsamples * sizeof(struct pmc_sample), M_PMC, 4003f263522aSJoseph Koshy M_WAITOK|M_ZERO); 4004f263522aSJoseph Koshy 4005f263522aSJoseph Koshy sb->ps_read = sb->ps_write = sb->ps_samples; 4006ba8ae2deSJoseph Koshy sb->ps_fence = sb->ps_samples + pmc_nsamples; 4007f263522aSJoseph Koshy KASSERT(pmc_pcpu[cpu] != NULL, 4008f263522aSJoseph Koshy ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu)); 4009f263522aSJoseph Koshy 4010f263522aSJoseph Koshy pmc_pcpu[cpu]->pc_sb = sb; 4011f263522aSJoseph Koshy } 4012f263522aSJoseph Koshy 4013ebccf1e3SJoseph Koshy /* allocate space for the row disposition array */ 4014ebccf1e3SJoseph Koshy pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc, 4015ebccf1e3SJoseph Koshy M_PMC, M_WAITOK|M_ZERO); 4016ebccf1e3SJoseph Koshy 4017ebccf1e3SJoseph Koshy KASSERT(pmc_pmcdisp != NULL, 4018ebccf1e3SJoseph Koshy ("[pmc,%d] pmcdisp allocation returned NULL", __LINE__)); 4019ebccf1e3SJoseph Koshy 4020ebccf1e3SJoseph Koshy /* mark all PMCs as available */ 4021ebccf1e3SJoseph Koshy for (n = 0; n < (int) md->pmd_npmc; n++) 4022ebccf1e3SJoseph Koshy PMC_MARK_ROW_FREE(n); 4023ebccf1e3SJoseph Koshy 4024ebccf1e3SJoseph Koshy /* allocate thread hash tables */ 4025ebccf1e3SJoseph Koshy pmc_ownerhash = hashinit(pmc_hashsize, M_PMC, 4026ebccf1e3SJoseph Koshy &pmc_ownerhashmask); 4027ebccf1e3SJoseph Koshy 4028ebccf1e3SJoseph Koshy pmc_processhash = hashinit(pmc_hashsize, M_PMC, 4029ebccf1e3SJoseph Koshy &pmc_processhashmask); 4030ebccf1e3SJoseph Koshy mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc", MTX_SPIN); 4031ebccf1e3SJoseph Koshy 4032f263522aSJoseph Koshy LIST_INIT(&pmc_ss_owners); 4033f263522aSJoseph Koshy pmc_ss_count = 0; 4034f263522aSJoseph Koshy 4035ebccf1e3SJoseph Koshy /* allocate a pool of spin mutexes */ 4036ebccf1e3SJoseph Koshy pmc_mtxpool = mtx_pool_create("pmc", pmc_mtxpool_size, MTX_SPIN); 4037ebccf1e3SJoseph Koshy 4038ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx " 4039ebccf1e3SJoseph Koshy "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask, 4040ebccf1e3SJoseph Koshy pmc_processhash, pmc_processhashmask); 4041ebccf1e3SJoseph Koshy 4042ebccf1e3SJoseph Koshy /* register process {exit,fork,exec} handlers */ 4043ebccf1e3SJoseph Koshy pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit, 4044ebccf1e3SJoseph Koshy pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY); 4045ebccf1e3SJoseph Koshy pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork, 4046ebccf1e3SJoseph Koshy pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY); 4047ebccf1e3SJoseph Koshy 4048f263522aSJoseph Koshy /* initialize logging */ 4049f263522aSJoseph Koshy pmclog_initialize(); 4050f263522aSJoseph Koshy 4051ebccf1e3SJoseph Koshy /* set hook functions */ 4052ebccf1e3SJoseph Koshy pmc_intr = md->pmd_intr; 4053ebccf1e3SJoseph Koshy pmc_hook = pmc_hook_handler; 4054ebccf1e3SJoseph Koshy 4055ebccf1e3SJoseph Koshy if (error == 0) { 4056ebccf1e3SJoseph Koshy printf(PMC_MODULE_NAME ":"); 4057a8eb16c5SJoseph Koshy for (n = 0; n < (int) md->pmd_nclass; n++) { 4058a8eb16c5SJoseph Koshy printf(" %s/%d/0x%b", 4059c5153e19SJoseph Koshy pmc_name_of_pmcclass[md->pmd_classes[n].pm_class], 4060a8eb16c5SJoseph Koshy md->pmd_nclasspmcs[n], 4061a8eb16c5SJoseph Koshy md->pmd_classes[n].pm_caps, 4062a8eb16c5SJoseph Koshy "\20" 4063a8eb16c5SJoseph Koshy "\1INT\2USR\3SYS\4EDG\5THR" 4064a8eb16c5SJoseph Koshy "\6REA\7WRI\10INV\11QUA\12PRC" 4065a8eb16c5SJoseph Koshy "\13TAG\14CSC"); 4066a8eb16c5SJoseph Koshy } 4067ebccf1e3SJoseph Koshy printf("\n"); 4068ebccf1e3SJoseph Koshy } 4069ebccf1e3SJoseph Koshy 4070ebccf1e3SJoseph Koshy return error; 4071ebccf1e3SJoseph Koshy } 4072ebccf1e3SJoseph Koshy 4073ebccf1e3SJoseph Koshy /* prepare to be unloaded */ 4074ebccf1e3SJoseph Koshy static void 4075ebccf1e3SJoseph Koshy pmc_cleanup(void) 4076ebccf1e3SJoseph Koshy { 4077ebccf1e3SJoseph Koshy int cpu; 4078ebccf1e3SJoseph Koshy struct pmc_ownerhash *ph; 4079ebccf1e3SJoseph Koshy struct pmc_owner *po, *tmp; 4080ebccf1e3SJoseph Koshy struct pmc_binding pb; 4081342ed5d9SRuslan Ermilov #ifdef DEBUG 4082ebccf1e3SJoseph Koshy struct pmc_processhash *prh; 4083ebccf1e3SJoseph Koshy #endif 4084ebccf1e3SJoseph Koshy 4085ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,0, "%s", "cleanup"); 4086ebccf1e3SJoseph Koshy 4087f263522aSJoseph Koshy /* switch off sampling */ 4088f263522aSJoseph Koshy atomic_store_rel_int(&pmc_cpumask, 0); 4089f263522aSJoseph Koshy pmc_intr = NULL; 4090ebccf1e3SJoseph Koshy 4091ebccf1e3SJoseph Koshy sx_xlock(&pmc_sx); 4092ebccf1e3SJoseph Koshy if (pmc_hook == NULL) { /* being unloaded already */ 4093ebccf1e3SJoseph Koshy sx_xunlock(&pmc_sx); 4094ebccf1e3SJoseph Koshy return; 4095ebccf1e3SJoseph Koshy } 4096ebccf1e3SJoseph Koshy 4097ebccf1e3SJoseph Koshy pmc_hook = NULL; /* prevent new threads from entering module */ 4098ebccf1e3SJoseph Koshy 4099ebccf1e3SJoseph Koshy /* deregister event handlers */ 4100ebccf1e3SJoseph Koshy EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag); 4101ebccf1e3SJoseph Koshy EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag); 4102ebccf1e3SJoseph Koshy 4103ebccf1e3SJoseph Koshy /* send SIGBUS to all owner threads, free up allocations */ 4104ebccf1e3SJoseph Koshy if (pmc_ownerhash) 4105ebccf1e3SJoseph Koshy for (ph = pmc_ownerhash; 4106ebccf1e3SJoseph Koshy ph <= &pmc_ownerhash[pmc_ownerhashmask]; 4107ebccf1e3SJoseph Koshy ph++) { 4108ebccf1e3SJoseph Koshy LIST_FOREACH_SAFE(po, ph, po_next, tmp) { 4109ebccf1e3SJoseph Koshy pmc_remove_owner(po); 4110ebccf1e3SJoseph Koshy 4111ebccf1e3SJoseph Koshy /* send SIGBUS to owner processes */ 4112ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,2, "cleanup signal proc=%p " 4113ebccf1e3SJoseph Koshy "(%d, %s)", po->po_owner, 4114ebccf1e3SJoseph Koshy po->po_owner->p_pid, 4115ebccf1e3SJoseph Koshy po->po_owner->p_comm); 4116ebccf1e3SJoseph Koshy 4117ebccf1e3SJoseph Koshy PROC_LOCK(po->po_owner); 4118ebccf1e3SJoseph Koshy psignal(po->po_owner, SIGBUS); 4119ebccf1e3SJoseph Koshy PROC_UNLOCK(po->po_owner); 4120f263522aSJoseph Koshy 4121f263522aSJoseph Koshy pmc_destroy_owner_descriptor(po); 4122ebccf1e3SJoseph Koshy } 4123ebccf1e3SJoseph Koshy } 4124ebccf1e3SJoseph Koshy 4125ebccf1e3SJoseph Koshy /* reclaim allocated data structures */ 4126ebccf1e3SJoseph Koshy if (pmc_mtxpool) 4127ebccf1e3SJoseph Koshy mtx_pool_destroy(&pmc_mtxpool); 4128ebccf1e3SJoseph Koshy 4129ebccf1e3SJoseph Koshy mtx_destroy(&pmc_processhash_mtx); 4130ebccf1e3SJoseph Koshy if (pmc_processhash) { 4131342ed5d9SRuslan Ermilov #ifdef DEBUG 4132ebccf1e3SJoseph Koshy struct pmc_process *pp; 4133ebccf1e3SJoseph Koshy 4134ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,3, "%s", "destroy process hash"); 4135ebccf1e3SJoseph Koshy for (prh = pmc_processhash; 4136ebccf1e3SJoseph Koshy prh <= &pmc_processhash[pmc_processhashmask]; 4137ebccf1e3SJoseph Koshy prh++) 4138ebccf1e3SJoseph Koshy LIST_FOREACH(pp, prh, pp_next) 4139ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid); 4140ebccf1e3SJoseph Koshy #endif 4141ebccf1e3SJoseph Koshy 4142ebccf1e3SJoseph Koshy hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask); 4143ebccf1e3SJoseph Koshy pmc_processhash = NULL; 4144ebccf1e3SJoseph Koshy } 4145ebccf1e3SJoseph Koshy 4146ebccf1e3SJoseph Koshy if (pmc_ownerhash) { 4147ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,3, "%s", "destroy owner hash"); 4148ebccf1e3SJoseph Koshy hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask); 4149ebccf1e3SJoseph Koshy pmc_ownerhash = NULL; 4150ebccf1e3SJoseph Koshy } 4151ebccf1e3SJoseph Koshy 4152f263522aSJoseph Koshy KASSERT(LIST_EMPTY(&pmc_ss_owners), 4153f263522aSJoseph Koshy ("[pmc,%d] Global SS owner list not empty", __LINE__)); 4154f263522aSJoseph Koshy KASSERT(pmc_ss_count == 0, 4155f263522aSJoseph Koshy ("[pmc,%d] Global SS count not empty", __LINE__)); 4156f263522aSJoseph Koshy 4157ba8ae2deSJoseph Koshy /* free the per-cpu sample buffers */ 4158ba8ae2deSJoseph Koshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4159ba8ae2deSJoseph Koshy if (pmc_cpu_is_disabled(cpu)) 4160ba8ae2deSJoseph Koshy continue; 4161ba8ae2deSJoseph Koshy KASSERT(pmc_pcpu[cpu]->pc_sb != NULL, 4162ba8ae2deSJoseph Koshy ("[pmc,%d] Null cpu sample buffer cpu=%d", __LINE__, 4163ba8ae2deSJoseph Koshy cpu)); 4164ba8ae2deSJoseph Koshy FREE(pmc_pcpu[cpu]->pc_sb, M_PMC); 4165ba8ae2deSJoseph Koshy pmc_pcpu[cpu]->pc_sb = NULL; 4166ba8ae2deSJoseph Koshy } 4167ba8ae2deSJoseph Koshy 4168ebccf1e3SJoseph Koshy /* do processor dependent cleanup */ 4169ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,3, "%s", "md cleanup"); 4170ebccf1e3SJoseph Koshy if (md) { 4171ebccf1e3SJoseph Koshy pmc_save_cpu_binding(&pb); 4172ebccf1e3SJoseph Koshy for (cpu = 0; cpu < mp_ncpus; cpu++) { 4173ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p", 4174ebccf1e3SJoseph Koshy cpu, pmc_pcpu[cpu]); 4175ebccf1e3SJoseph Koshy if (pmc_cpu_is_disabled(cpu)) 4176ebccf1e3SJoseph Koshy continue; 4177ebccf1e3SJoseph Koshy pmc_select_cpu(cpu); 4178ebccf1e3SJoseph Koshy if (pmc_pcpu[cpu]) 4179ebccf1e3SJoseph Koshy (void) md->pmd_cleanup(cpu); 4180ebccf1e3SJoseph Koshy } 4181ebccf1e3SJoseph Koshy FREE(md, M_PMC); 4182ebccf1e3SJoseph Koshy md = NULL; 4183ebccf1e3SJoseph Koshy pmc_restore_cpu_binding(&pb); 4184ebccf1e3SJoseph Koshy } 4185ebccf1e3SJoseph Koshy 4186ebccf1e3SJoseph Koshy /* deallocate per-cpu structures */ 4187ebccf1e3SJoseph Koshy FREE(pmc_pcpu, M_PMC); 4188ebccf1e3SJoseph Koshy pmc_pcpu = NULL; 4189ebccf1e3SJoseph Koshy 4190ebccf1e3SJoseph Koshy FREE(pmc_pcpu_saved, M_PMC); 4191ebccf1e3SJoseph Koshy pmc_pcpu_saved = NULL; 4192ebccf1e3SJoseph Koshy 4193ebccf1e3SJoseph Koshy if (pmc_pmcdisp) { 4194ebccf1e3SJoseph Koshy FREE(pmc_pmcdisp, M_PMC); 4195ebccf1e3SJoseph Koshy pmc_pmcdisp = NULL; 4196ebccf1e3SJoseph Koshy } 4197ebccf1e3SJoseph Koshy 4198f263522aSJoseph Koshy pmclog_shutdown(); 4199f263522aSJoseph Koshy 4200ebccf1e3SJoseph Koshy sx_xunlock(&pmc_sx); /* we are done */ 4201ebccf1e3SJoseph Koshy } 4202ebccf1e3SJoseph Koshy 4203ebccf1e3SJoseph Koshy /* 4204ebccf1e3SJoseph Koshy * The function called at load/unload. 4205ebccf1e3SJoseph Koshy */ 4206ebccf1e3SJoseph Koshy 4207ebccf1e3SJoseph Koshy static int 4208ebccf1e3SJoseph Koshy load (struct module *module __unused, int cmd, void *arg __unused) 4209ebccf1e3SJoseph Koshy { 4210ebccf1e3SJoseph Koshy int error; 4211ebccf1e3SJoseph Koshy 4212ebccf1e3SJoseph Koshy error = 0; 4213ebccf1e3SJoseph Koshy 4214ebccf1e3SJoseph Koshy switch (cmd) { 4215ebccf1e3SJoseph Koshy case MOD_LOAD : 4216ebccf1e3SJoseph Koshy /* initialize the subsystem */ 4217ebccf1e3SJoseph Koshy error = pmc_initialize(); 4218ebccf1e3SJoseph Koshy if (error != 0) 4219ebccf1e3SJoseph Koshy break; 4220ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,1, "syscall=%d ncpus=%d", 4221ebccf1e3SJoseph Koshy pmc_syscall_num, mp_ncpus); 4222ebccf1e3SJoseph Koshy break; 4223ebccf1e3SJoseph Koshy 4224ebccf1e3SJoseph Koshy 4225ebccf1e3SJoseph Koshy case MOD_UNLOAD : 4226ebccf1e3SJoseph Koshy case MOD_SHUTDOWN: 4227ebccf1e3SJoseph Koshy pmc_cleanup(); 4228ebccf1e3SJoseph Koshy PMCDBG(MOD,INI,1, "%s", "unloaded"); 4229ebccf1e3SJoseph Koshy break; 4230ebccf1e3SJoseph Koshy 4231ebccf1e3SJoseph Koshy default : 4232ebccf1e3SJoseph Koshy error = EINVAL; /* XXX should panic(9) */ 4233ebccf1e3SJoseph Koshy break; 4234ebccf1e3SJoseph Koshy } 4235ebccf1e3SJoseph Koshy 4236ebccf1e3SJoseph Koshy return error; 4237ebccf1e3SJoseph Koshy } 4238ebccf1e3SJoseph Koshy 4239ebccf1e3SJoseph Koshy /* memory pool */ 4240ebccf1e3SJoseph Koshy MALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module"); 4241