2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2003-2007, Joseph Koshy
5 * Copyright (c) 2007 The FreeBSD Foundation
8 * Portions of this software were developed by A. Joseph Koshy under
9 * sponsorship from the FreeBSD Foundation and Google, Inc.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * PMC interface used by the base kernel.
39 #ifndef _SYS_PMCKERN_H_
40 #define _SYS_PMCKERN_H_
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
50 #include <machine/cpufunc.h>
52 #define PMC_FN_PROCESS_EXEC 1
53 #define PMC_FN_CSW_IN 2
54 #define PMC_FN_CSW_OUT 3
55 #define PMC_FN_DO_SAMPLES 4
56 #define PMC_FN_UNUSED1 5
57 #define PMC_FN_UNUSED2 6
59 #define PMC_FN_MUNMAP 8
60 #define PMC_FN_USER_CALLCHAIN 9
61 #define PMC_FN_USER_CALLCHAIN_SOFT 10
62 #define PMC_FN_SOFT_SAMPLING 11
63 #define PMC_FN_THR_CREATE 12
64 #define PMC_FN_THR_EXIT 13
65 #define PMC_FN_THR_USERRET 14
66 #define PMC_FN_THR_CREATE_LOG 15
67 #define PMC_FN_THR_EXIT_LOG 16
68 #define PMC_FN_PROC_CREATE_LOG 17
70 typedef enum ring_type {
71 PMC_HR = 0, /* Hardware ring buffer */
72 PMC_SR = 1, /* Software ring buffer */
73 PMC_UR = 2, /* userret ring buffer */
77 struct pmckern_procexec {
78 int pm_credentialschanged;
79 uintfptr_t pm_entryaddr;
82 struct pmckern_map_in {
83 void *pm_file; /* filename or vnode pointer */
84 uintfptr_t pm_address; /* address object is loaded at */
87 struct pmckern_map_out {
88 uintfptr_t pm_address; /* start address of region */
89 size_t pm_size; /* size of unmapped region */
95 struct trapframe *pm_tf;
102 #define PMC_SOFT_DEFINE_EX(prov, mod, func, name, alloc, release) \
103 struct pmc_soft pmc_##prov##_##mod##_##func##_##name = \
104 { 0, alloc, release, { #prov "_" #mod "_" #func "." #name, 0 } }; \
105 SYSINIT(pmc_##prov##_##mod##_##func##_##name##_init, SI_SUB_KDTRACE, \
106 SI_ORDER_SECOND + 1, pmc_soft_ev_register, \
107 &pmc_##prov##_##mod##_##func##_##name ); \
108 SYSUNINIT(pmc_##prov##_##mod##_##func##_##name##_uninit, \
109 SI_SUB_KDTRACE, SI_ORDER_SECOND + 1, pmc_soft_ev_deregister, \
110 &pmc_##prov##_##mod##_##func##_##name )
112 #define PMC_SOFT_DEFINE(prov, mod, func, name) \
113 PMC_SOFT_DEFINE_EX(prov, mod, func, name, NULL, NULL)
115 #define PMC_SOFT_DECLARE(prov, mod, func, name) \
116 extern struct pmc_soft pmc_##prov##_##mod##_##func##_##name
119 * PMC_SOFT_CALL can be used anywhere in the kernel.
120 * Require md defined PMC_FAKE_TRAPFRAME.
122 #ifdef PMC_FAKE_TRAPFRAME
123 #define PMC_SOFT_CALL(pr, mo, fu, na) \
125 if (__predict_false(pmc_##pr##_##mo##_##fu##_##na.ps_running)) { \
126 struct pmckern_soft ks; \
128 intr = intr_disable(); \
129 PMC_FAKE_TRAPFRAME(&pmc_tf[curcpu]); \
130 ks.pm_ev = pmc_##pr##_##mo##_##fu##_##na.ps_ev.pm_ev_code; \
131 ks.pm_cpu = PCPU_GET(cpuid); \
132 ks.pm_tf = &pmc_tf[curcpu]; \
133 PMC_CALL_HOOK_UNLOCKED(curthread, \
134 PMC_FN_SOFT_SAMPLING, (void *) &ks); \
135 intr_restore(intr); \
139 #define PMC_SOFT_CALL(pr, mo, fu, na) \
145 * PMC_SOFT_CALL_TF need to be used carefully.
146 * Userland capture will be done during AST processing.
148 #define PMC_SOFT_CALL_TF(pr, mo, fu, na, tf) \
150 if (__predict_false(pmc_##pr##_##mo##_##fu##_##na.ps_running)) { \
151 struct pmckern_soft ks; \
153 intr = intr_disable(); \
154 ks.pm_ev = pmc_##pr##_##mo##_##fu##_##na.ps_ev.pm_ev_code; \
155 ks.pm_cpu = PCPU_GET(cpuid); \
157 PMC_CALL_HOOK_UNLOCKED(curthread, \
158 PMC_FN_SOFT_SAMPLING, (void *) &ks); \
159 intr_restore(intr); \
165 void (*ps_alloc)(void);
166 void (*ps_release)(void);
167 struct pmc_dyn_event_descr ps_ev;
170 struct pmclog_buffer;
172 struct pmc_domain_buffer_header {
174 TAILQ_HEAD(, pmclog_buffer) pdbh_head;
175 struct pmclog_buffer *pdbh_plbs;
177 } __aligned(CACHE_LINE_SIZE);
180 extern int (*pmc_hook)(struct thread *_td, int _function, void *_arg);
181 extern int (*pmc_intr)(struct trapframe *_frame);
183 /* SX lock protecting the hook */
184 extern struct sx pmc_sx;
186 /* Per-cpu flags indicating availability of sampling data */
187 DPCPU_DECLARE(uint8_t, pmc_sampled);
189 /* Count of system-wide sampling PMCs in existence */
190 extern volatile int pmc_ss_count;
192 /* kernel version number */
193 extern const int pmc_kernel_version;
195 /* PMC soft per cpu trapframe */
196 extern struct trapframe pmc_tf[MAXCPU];
198 /* per domain buffer header list */
199 extern struct pmc_domain_buffer_header *pmc_dom_hdrs[MAXMEMDOM];
201 /* Quick check if preparatory work is necessary */
202 #define PMC_HOOK_INSTALLED(cmd) __predict_false(pmc_hook != NULL)
204 /* Hook invocation; for use within the kernel */
205 #define PMC_CALL_HOOK(t, cmd, arg) \
207 struct epoch_tracker et; \
208 epoch_enter_preempt(global_epoch_preempt, &et); \
209 if (pmc_hook != NULL) \
210 (pmc_hook)((t), (cmd), (arg)); \
211 epoch_exit_preempt(global_epoch_preempt, &et); \
214 /* Hook invocation that needs an exclusive lock */
215 #define PMC_CALL_HOOK_X(t, cmd, arg) \
218 if (pmc_hook != NULL) \
219 (pmc_hook)((t), (cmd), (arg)); \
220 sx_xunlock(&pmc_sx); \
224 * Some hook invocations (e.g., from context switch and clock handling
225 * code) need to be lock-free.
227 #define PMC_CALL_HOOK_UNLOCKED(t, cmd, arg) \
229 if (pmc_hook != NULL) \
230 (pmc_hook)((t), (cmd), (arg)); \
233 #define PMC_SWITCH_CONTEXT(t,cmd) PMC_CALL_HOOK_UNLOCKED(t,cmd,NULL)
235 /* Check if a process is using HWPMCs.*/
236 #define PMC_PROC_IS_USING_PMCS(p) \
237 (__predict_false(p->p_flag & P_HWPMC))
239 #define PMC_THREAD_HAS_SAMPLES(td) \
240 (__predict_false((td)->td_pmcpend))
242 /* Check if a thread have pending user capture. */
243 #define PMC_IS_PENDING_CALLCHAIN(p) \
244 (__predict_false((p)->td_pflags & TDP_CALLCHAIN))
246 #define PMC_SYSTEM_SAMPLING_ACTIVE() (pmc_ss_count > 0)
248 /* Check if a CPU has recorded samples. */
249 #define PMC_CPU_HAS_SAMPLES(C) (__predict_false(DPCPU_ID_GET((C), pmc_sampled)))
254 int pmc_cpu_is_disabled(int _cpu); /* deprecated */
255 int pmc_cpu_is_active(int _cpu);
256 int pmc_cpu_is_present(int _cpu);
257 int pmc_cpu_is_primary(int _cpu);
258 unsigned int pmc_cpu_max(void);
261 int pmc_cpu_max_active(void);
265 * Soft events functions.
267 void pmc_soft_ev_register(struct pmc_soft *ps);
268 void pmc_soft_ev_deregister(struct pmc_soft *ps);
269 struct pmc_soft *pmc_soft_ev_acquire(enum pmc_event ev);
270 void pmc_soft_ev_release(struct pmc_soft *ps);
272 #endif /* _SYS_PMCKERN_H_ */