242 lines
7.1 KiB
C
242 lines
7.1 KiB
C
/*-
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* Copyright (c) 2003-2007, Joseph Koshy
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* Copyright (c) 2007 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by A. Joseph Koshy under
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* sponsorship from the FreeBSD Foundation and Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* PMC interface used by the base kernel.
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*/
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#ifndef _SYS_PMCKERN_H_
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#define _SYS_PMCKERN_H_
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#include <sys/pmc.h>
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#include <machine/cpufunc.h>
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#define PMC_FN_PROCESS_EXEC 1
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#define PMC_FN_CSW_IN 2
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#define PMC_FN_CSW_OUT 3
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#define PMC_FN_DO_SAMPLES 4
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#define PMC_FN_UNUSED1 5
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#define PMC_FN_UNUSED2 6
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#define PMC_FN_MMAP 7
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#define PMC_FN_MUNMAP 8
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#define PMC_FN_USER_CALLCHAIN 9
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#define PMC_FN_USER_CALLCHAIN_SOFT 10
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#define PMC_FN_SOFT_SAMPLING 11
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#define PMC_HR 0 /* Hardware ring buffer */
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#define PMC_SR 1 /* Software ring buffer */
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struct pmckern_procexec {
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int pm_credentialschanged;
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uintfptr_t pm_entryaddr;
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};
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struct pmckern_map_in {
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void *pm_file; /* filename or vnode pointer */
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uintfptr_t pm_address; /* address object is loaded at */
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};
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struct pmckern_map_out {
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uintfptr_t pm_address; /* start address of region */
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size_t pm_size; /* size of unmapped region */
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};
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struct pmckern_soft {
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enum pmc_event pm_ev;
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int pm_cpu;
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struct trapframe *pm_tf;
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};
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/*
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* Soft PMC.
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*/
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#define PMC_SOFT_DEFINE_EX(prov, mod, func, name, alloc, release) \
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struct pmc_soft pmc_##prov##_##mod##_##func##_##name = \
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{ 0, alloc, release, { #prov "_" #mod "_" #func "." #name, 0 } }; \
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SYSINIT(pmc_##prov##_##mod##_##func##_##name##_init, SI_SUB_KDTRACE, \
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SI_ORDER_SECOND + 1, pmc_soft_ev_register, \
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&pmc_##prov##_##mod##_##func##_##name ); \
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SYSUNINIT(pmc_##prov##_##mod##_##func##_##name##_uninit, \
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SI_SUB_KDTRACE, SI_ORDER_SECOND + 1, pmc_soft_ev_deregister, \
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&pmc_##prov##_##mod##_##func##_##name )
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#define PMC_SOFT_DEFINE(prov, mod, func, name) \
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PMC_SOFT_DEFINE_EX(prov, mod, func, name, NULL, NULL)
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#define PMC_SOFT_DECLARE(prov, mod, func, name) \
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extern struct pmc_soft pmc_##prov##_##mod##_##func##_##name
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/*
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* PMC_SOFT_CALL can be used anywhere in the kernel.
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* Require md defined PMC_FAKE_TRAPFRAME.
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*/
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#ifdef PMC_FAKE_TRAPFRAME
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#define PMC_SOFT_CALL(pr, mo, fu, na) \
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do { \
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if (__predict_false(pmc_##pr##_##mo##_##fu##_##na.ps_running)) { \
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struct pmckern_soft ks; \
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register_t intr; \
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intr = intr_disable(); \
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PMC_FAKE_TRAPFRAME(&pmc_tf[curcpu]); \
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ks.pm_ev = pmc_##pr##_##mo##_##fu##_##na.ps_ev.pm_ev_code; \
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ks.pm_cpu = PCPU_GET(cpuid); \
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ks.pm_tf = &pmc_tf[curcpu]; \
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PMC_CALL_HOOK_UNLOCKED(curthread, \
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PMC_FN_SOFT_SAMPLING, (void *) &ks); \
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intr_restore(intr); \
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} \
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} while (0)
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#else
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#define PMC_SOFT_CALL(pr, mo, fu, na) \
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do { \
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} while (0)
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#endif
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/*
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* PMC_SOFT_CALL_TF need to be used carefully.
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* Userland capture will be done during AST processing.
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*/
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#define PMC_SOFT_CALL_TF(pr, mo, fu, na, tf) \
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do { \
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if (__predict_false(pmc_##pr##_##mo##_##fu##_##na.ps_running)) { \
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struct pmckern_soft ks; \
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register_t intr; \
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intr = intr_disable(); \
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ks.pm_ev = pmc_##pr##_##mo##_##fu##_##na.ps_ev.pm_ev_code; \
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ks.pm_cpu = PCPU_GET(cpuid); \
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ks.pm_tf = tf; \
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PMC_CALL_HOOK_UNLOCKED(curthread, \
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PMC_FN_SOFT_SAMPLING, (void *) &ks); \
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intr_restore(intr); \
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} \
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} while (0)
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struct pmc_soft {
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int ps_running;
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void (*ps_alloc)(void);
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void (*ps_release)(void);
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struct pmc_dyn_event_descr ps_ev;
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};
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/* hook */
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extern int (*pmc_hook)(struct thread *_td, int _function, void *_arg);
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extern int (*pmc_intr)(int _cpu, struct trapframe *_frame);
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/* SX lock protecting the hook */
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extern struct sx pmc_sx;
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/* Per-cpu flags indicating availability of sampling data */
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extern volatile cpuset_t pmc_cpumask;
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/* Count of system-wide sampling PMCs in existence */
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extern volatile int pmc_ss_count;
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/* kernel version number */
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extern const int pmc_kernel_version;
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/* PMC soft per cpu trapframe */
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extern struct trapframe pmc_tf[MAXCPU];
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/* Hook invocation; for use within the kernel */
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#define PMC_CALL_HOOK(t, cmd, arg) \
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do { \
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sx_slock(&pmc_sx); \
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if (pmc_hook != NULL) \
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(pmc_hook)((t), (cmd), (arg)); \
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sx_sunlock(&pmc_sx); \
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} while (0)
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/* Hook invocation that needs an exclusive lock */
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#define PMC_CALL_HOOK_X(t, cmd, arg) \
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do { \
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sx_xlock(&pmc_sx); \
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if (pmc_hook != NULL) \
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(pmc_hook)((t), (cmd), (arg)); \
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sx_xunlock(&pmc_sx); \
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} while (0)
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/*
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* Some hook invocations (e.g., from context switch and clock handling
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* code) need to be lock-free.
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*/
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#define PMC_CALL_HOOK_UNLOCKED(t, cmd, arg) \
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do { \
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if (pmc_hook != NULL) \
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(pmc_hook)((t), (cmd), (arg)); \
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} while (0)
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#define PMC_SWITCH_CONTEXT(t,cmd) PMC_CALL_HOOK_UNLOCKED(t,cmd,NULL)
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/* Check if a process is using HWPMCs.*/
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#define PMC_PROC_IS_USING_PMCS(p) \
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(__predict_false(p->p_flag & P_HWPMC))
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/* Check if a thread have pending user capture. */
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#define PMC_IS_PENDING_CALLCHAIN(p) \
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(__predict_false((p)->td_pflags & TDP_CALLCHAIN))
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#define PMC_SYSTEM_SAMPLING_ACTIVE() (pmc_ss_count > 0)
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/* Check if a CPU has recorded samples. */
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#define PMC_CPU_HAS_SAMPLES(C) (__predict_false(CPU_ISSET(C, &pmc_cpumask)))
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/*
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* Helper functions.
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*/
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int pmc_cpu_is_disabled(int _cpu); /* deprecated */
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int pmc_cpu_is_active(int _cpu);
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int pmc_cpu_is_present(int _cpu);
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int pmc_cpu_is_primary(int _cpu);
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unsigned int pmc_cpu_max(void);
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#ifdef INVARIANTS
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int pmc_cpu_max_active(void);
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#endif
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/*
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* Soft events functions.
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*/
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void pmc_soft_ev_register(struct pmc_soft *ps);
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void pmc_soft_ev_deregister(struct pmc_soft *ps);
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struct pmc_soft *pmc_soft_ev_acquire(enum pmc_event ev);
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void pmc_soft_ev_release(struct pmc_soft *ps);
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#endif /* _SYS_PMCKERN_H_ */
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