1 /*- 2 * Copyright (c) 2003-2005, Joseph Koshy 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include "opt_hwpmc_hooks.h" 30 31 #include <sys/types.h> 32 #include <sys/pmc.h> 33 #include <sys/pmckern.h> 34 #include <sys/smp.h> 35 36 #if HWPMC_HOOKS 37 #define PMC_KERNEL_VERSION PMC_VERSION 38 #else 39 #define PMC_KERNEL_VERSION 0 40 #endif 41 42 const int pmc_kernel_version = PMC_KERNEL_VERSION; 43 44 /* Hook variable. */ 45 int (*pmc_hook)(struct thread *td, int function, void *arg) = NULL; 46 47 /* Interrupt handler */ 48 int (*pmc_intr)(int cpu, uintptr_t pc, int usermode) = NULL; 49 50 /* Bitmask of CPUs requiring servicing at hardclock time */ 51 volatile cpumask_t pmc_cpumask; 52 53 /* 54 * A global count of SS mode PMCs. When non-zero, this means that 55 * we have processes that are sampling the system as a whole. 56 */ 57 volatile int pmc_ss_count; 58 59 /* 60 * Since PMC(4) may not be loaded in the current kernel, the 61 * convention followed is that a non-NULL value of 'pmc_hook' implies 62 * the presence of this kernel module. 63 * 64 * This requires us to protect 'pmc_hook' with a 65 * shared (sx) lock -- thus making the process of calling into PMC(4) 66 * somewhat more expensive than a simple 'if' check and indirect call. 67 */ 68 struct sx pmc_sx; 69 SX_SYSINIT(pmc, &pmc_sx, "pmc shared lock"); 70 71 /* 72 * Helper functions 73 */ 74 75 int 76 pmc_cpu_is_disabled(int cpu) 77 { 78 #ifdef SMP 79 return ((hlt_cpus_mask & (1 << cpu)) != 0); 80 #else 81 return 0; 82 #endif 83 } 84 85 int 86 pmc_cpu_is_logical(int cpu) 87 { 88 #ifdef SMP 89 return ((logical_cpus_mask & (1 << cpu)) != 0); 90 #else 91 return 0; 92 #endif 93 } 94