2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2003-2008, 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
38 #include <dev/hwpmc/pmc_events.h>
40 #include <sys/counter.h>
41 #include <machine/pmc_mdep.h>
42 #include <machine/profile.h>
44 #include <sys/epoch.h>
48 #define PMC_MODULE_NAME "hwpmc"
49 #define PMC_NAME_MAX 64 /* HW counter name size */
50 #define PMC_CLASS_MAX 8 /* max #classes of PMCs per-system */
53 * Kernel<->userland API version number [MMmmpppp]
55 * Major numbers are to be incremented when an incompatible change to
56 * the ABI occurs that older clients will not be able to handle.
58 * Minor numbers are incremented when a backwards compatible change
59 * occurs that allows older correct programs to run unchanged. For
60 * example, when support for a new PMC type is added.
62 * The patch version is incremented for every bug fix.
64 #define PMC_VERSION_MAJOR 0x09
65 #define PMC_VERSION_MINOR 0x03
66 #define PMC_VERSION_PATCH 0x0000
68 #define PMC_VERSION (PMC_VERSION_MAJOR << 24 | \
69 PMC_VERSION_MINOR << 16 | PMC_VERSION_PATCH)
71 #define PMC_CPUID_LEN 64
72 /* cpu model name for pmu lookup */
73 extern char pmc_cpuid[PMC_CPUID_LEN];
76 * Kinds of CPUs known.
78 * We keep track of CPU variants that need to be distinguished in
79 * some way for PMC operations. CPU names are grouped by manufacturer
80 * and numbered sparsely in order to minimize changes to the ABI involved
81 * when new CPUs are added.
84 #define __PMC_CPUS() \
85 __PMC_CPU(AMD_K7, 0x00, "AMD K7") \
86 __PMC_CPU(AMD_K8, 0x01, "AMD K8") \
87 __PMC_CPU(INTEL_P5, 0x80, "Intel Pentium") \
88 __PMC_CPU(INTEL_P6, 0x81, "Intel Pentium Pro") \
89 __PMC_CPU(INTEL_CL, 0x82, "Intel Celeron") \
90 __PMC_CPU(INTEL_PII, 0x83, "Intel Pentium II") \
91 __PMC_CPU(INTEL_PIII, 0x84, "Intel Pentium III") \
92 __PMC_CPU(INTEL_PM, 0x85, "Intel Pentium M") \
93 __PMC_CPU(INTEL_PIV, 0x86, "Intel Pentium IV") \
94 __PMC_CPU(INTEL_CORE, 0x87, "Intel Core Solo/Duo") \
95 __PMC_CPU(INTEL_CORE2, 0x88, "Intel Core2") \
96 __PMC_CPU(INTEL_CORE2EXTREME, 0x89, "Intel Core2 Extreme") \
97 __PMC_CPU(INTEL_ATOM, 0x8A, "Intel Atom") \
98 __PMC_CPU(INTEL_COREI7, 0x8B, "Intel Core i7") \
99 __PMC_CPU(INTEL_WESTMERE, 0x8C, "Intel Westmere") \
100 __PMC_CPU(INTEL_SANDYBRIDGE, 0x8D, "Intel Sandy Bridge") \
101 __PMC_CPU(INTEL_IVYBRIDGE, 0x8E, "Intel Ivy Bridge") \
102 __PMC_CPU(INTEL_SANDYBRIDGE_XEON, 0x8F, "Intel Sandy Bridge Xeon") \
103 __PMC_CPU(INTEL_IVYBRIDGE_XEON, 0x90, "Intel Ivy Bridge Xeon") \
104 __PMC_CPU(INTEL_HASWELL, 0x91, "Intel Haswell") \
105 __PMC_CPU(INTEL_ATOM_SILVERMONT, 0x92, "Intel Atom Silvermont") \
106 __PMC_CPU(INTEL_NEHALEM_EX, 0x93, "Intel Nehalem Xeon 7500") \
107 __PMC_CPU(INTEL_WESTMERE_EX, 0x94, "Intel Westmere Xeon E7") \
108 __PMC_CPU(INTEL_HASWELL_XEON, 0x95, "Intel Haswell Xeon E5 v3") \
109 __PMC_CPU(INTEL_BROADWELL, 0x96, "Intel Broadwell") \
110 __PMC_CPU(INTEL_BROADWELL_XEON, 0x97, "Intel Broadwell Xeon") \
111 __PMC_CPU(INTEL_SKYLAKE, 0x98, "Intel Skylake") \
112 __PMC_CPU(INTEL_SKYLAKE_XEON, 0x99, "Intel Skylake Xeon") \
113 __PMC_CPU(INTEL_ATOM_GOLDMONT, 0x9A, "Intel Atom Goldmont") \
114 __PMC_CPU(INTEL_ICELAKE, 0x9B, "Intel Icelake") \
115 __PMC_CPU(INTEL_ICELAKE_XEON, 0x9C, "Intel Icelake Xeon") \
116 __PMC_CPU(INTEL_XSCALE, 0x100, "Intel XScale") \
117 __PMC_CPU(MIPS_24K, 0x200, "MIPS 24K") \
118 __PMC_CPU(MIPS_OCTEON, 0x201, "Cavium Octeon") \
119 __PMC_CPU(MIPS_74K, 0x202, "MIPS 74K") \
120 __PMC_CPU(MIPS_BERI, 0x203, "BERI") \
121 __PMC_CPU(PPC_7450, 0x300, "PowerPC MPC7450") \
122 __PMC_CPU(PPC_E500, 0x340, "PowerPC e500 Core") \
123 __PMC_CPU(PPC_970, 0x380, "IBM PowerPC 970") \
124 __PMC_CPU(PPC_POWER8, 0x390, "IBM POWER8") \
125 __PMC_CPU(GENERIC, 0x400, "Generic") \
126 __PMC_CPU(ARMV7_CORTEX_A5, 0x500, "ARMv7 Cortex A5") \
127 __PMC_CPU(ARMV7_CORTEX_A7, 0x501, "ARMv7 Cortex A7") \
128 __PMC_CPU(ARMV7_CORTEX_A8, 0x502, "ARMv7 Cortex A8") \
129 __PMC_CPU(ARMV7_CORTEX_A9, 0x503, "ARMv7 Cortex A9") \
130 __PMC_CPU(ARMV7_CORTEX_A15, 0x504, "ARMv7 Cortex A15") \
131 __PMC_CPU(ARMV7_CORTEX_A17, 0x505, "ARMv7 Cortex A17") \
132 __PMC_CPU(ARMV8_CORTEX_A53, 0x600, "ARMv8 Cortex A53") \
133 __PMC_CPU(ARMV8_CORTEX_A57, 0x601, "ARMv8 Cortex A57") \
134 __PMC_CPU(ARMV8_CORTEX_A76, 0x602, "ARMv8 Cortex A76")
138 #define __PMC_CPU(S,V,D) PMC_CPU_##S = V,
142 #define PMC_CPU_FIRST PMC_CPU_AMD_K7
143 #define PMC_CPU_LAST PMC_CPU_ARMV8_CORTEX_A76
149 #define __PMC_CLASSES() \
150 __PMC_CLASS(TSC, 0x00, "CPU Timestamp counter") \
151 __PMC_CLASS(K7, 0x01, "AMD K7 performance counters") \
152 __PMC_CLASS(K8, 0x02, "AMD K8 performance counters") \
153 __PMC_CLASS(P5, 0x03, "Intel Pentium counters") \
154 __PMC_CLASS(P6, 0x04, "Intel Pentium Pro counters") \
155 __PMC_CLASS(P4, 0x05, "Intel Pentium-IV counters") \
156 __PMC_CLASS(IAF, 0x06, "Intel Core2/Atom, fixed function") \
157 __PMC_CLASS(IAP, 0x07, "Intel Core...Atom, programmable") \
158 __PMC_CLASS(UCF, 0x08, "Intel Uncore fixed function") \
159 __PMC_CLASS(UCP, 0x09, "Intel Uncore programmable") \
160 __PMC_CLASS(XSCALE, 0x0A, "Intel XScale counters") \
161 __PMC_CLASS(MIPS24K, 0x0B, "MIPS 24K") \
162 __PMC_CLASS(OCTEON, 0x0C, "Cavium Octeon") \
163 __PMC_CLASS(PPC7450, 0x0D, "Motorola MPC7450 class") \
164 __PMC_CLASS(PPC970, 0x0E, "IBM PowerPC 970 class") \
165 __PMC_CLASS(SOFT, 0x0F, "Software events") \
166 __PMC_CLASS(ARMV7, 0x10, "ARMv7") \
167 __PMC_CLASS(ARMV8, 0x11, "ARMv8") \
168 __PMC_CLASS(MIPS74K, 0x12, "MIPS 74K") \
169 __PMC_CLASS(E500, 0x13, "Freescale e500 class") \
170 __PMC_CLASS(BERI, 0x14, "MIPS BERI") \
171 __PMC_CLASS(POWER8, 0x15, "IBM POWER8 class")
175 #define __PMC_CLASS(S,V,D) PMC_CLASS_##S = V,
179 #define PMC_CLASS_FIRST PMC_CLASS_TSC
180 #define PMC_CLASS_LAST PMC_CLASS_POWER8
183 * A PMC can be in the following states:
186 * DISABLED -- administratively prohibited from being used.
187 * FREE -- HW available for use
189 * ALLOCATED -- allocated
190 * STOPPED -- allocated, but not counting events
191 * RUNNING -- allocated, and in operation; 'pm_runcount'
192 * holds the number of CPUs using this PMC at
194 * DELETED -- being destroyed
197 #define __PMC_HWSTATES() \
198 __PMC_STATE(DISABLED) \
201 #define __PMC_SWSTATES() \
202 __PMC_STATE(ALLOCATED) \
203 __PMC_STATE(STOPPED) \
204 __PMC_STATE(RUNNING) \
207 #define __PMC_STATES() \
213 #define __PMC_STATE(S) PMC_STATE_##S,
218 #define PMC_STATE_FIRST PMC_STATE_DISABLED
219 #define PMC_STATE_LAST PMC_STATE_DELETED
222 * An allocated PMC may used as a 'global' counter or as a
223 * 'thread-private' one. Each such mode of use can be in either
224 * statistical sampling mode or in counting mode. Thus a PMC in use
226 * SS i.e., SYSTEM STATISTICAL -- system-wide statistical profiling
227 * SC i.e., SYSTEM COUNTER -- system-wide counting mode
228 * TS i.e., THREAD STATISTICAL -- thread virtual, statistical profiling
229 * TC i.e., THREAD COUNTER -- thread virtual, counting mode
231 * Statistical profiling modes rely on the PMC periodically delivering
232 * a interrupt to the CPU (when the configured number of events have
233 * been measured), so the PMC must have the ability to generate
236 * In counting modes, the PMC counts its configured events, with the
237 * value of the PMC being read whenever needed by its owner process.
239 * The thread specific modes "virtualize" the PMCs -- the PMCs appear
240 * to be thread private and count events only when the profiled thread
241 * actually executes on the CPU.
243 * The system-wide "global" modes keep the PMCs running all the time
244 * and are used to measure the behaviour of the whole system.
247 #define __PMC_MODES() \
255 #define __PMC_MODE(M,N) PMC_MODE_##M = N,
259 #define PMC_MODE_FIRST PMC_MODE_SS
260 #define PMC_MODE_LAST PMC_MODE_TC
262 #define PMC_IS_COUNTING_MODE(mode) \
263 ((mode) == PMC_MODE_SC || (mode) == PMC_MODE_TC)
264 #define PMC_IS_SYSTEM_MODE(mode) \
265 ((mode) == PMC_MODE_SS || (mode) == PMC_MODE_SC)
266 #define PMC_IS_SAMPLING_MODE(mode) \
267 ((mode) == PMC_MODE_SS || (mode) == PMC_MODE_TS)
268 #define PMC_IS_VIRTUAL_MODE(mode) \
269 ((mode) == PMC_MODE_TS || (mode) == PMC_MODE_TC)
272 * PMC row disposition
275 #define __PMC_DISPOSITIONS(N) \
276 __PMC_DISP(STANDALONE) /* global/disabled counters */ \
277 __PMC_DISP(FREE) /* free/available */ \
278 __PMC_DISP(THREAD) /* thread-virtual PMCs */ \
279 __PMC_DISP(UNKNOWN) /* sentinel */
283 #define __PMC_DISP(D) PMC_DISP_##D ,
287 #define PMC_DISP_FIRST PMC_DISP_STANDALONE
288 #define PMC_DISP_LAST PMC_DISP_THREAD
291 * Counter capabilities
293 * __PMC_CAPS(NAME, VALUE, DESCRIPTION)
296 #define __PMC_CAPS() \
297 __PMC_CAP(INTERRUPT, 0, "generate interrupts") \
298 __PMC_CAP(USER, 1, "count user-mode events") \
299 __PMC_CAP(SYSTEM, 2, "count system-mode events") \
300 __PMC_CAP(EDGE, 3, "do edge detection of events") \
301 __PMC_CAP(THRESHOLD, 4, "ignore events below a threshold") \
302 __PMC_CAP(READ, 5, "read PMC counter") \
303 __PMC_CAP(WRITE, 6, "reprogram PMC counter") \
304 __PMC_CAP(INVERT, 7, "invert comparison sense") \
305 __PMC_CAP(QUALIFIER, 8, "further qualify monitored events") \
306 __PMC_CAP(PRECISE, 9, "perform precise sampling") \
307 __PMC_CAP(TAGGING, 10, "tag upstream events") \
308 __PMC_CAP(CASCADE, 11, "cascade counters")
313 #define __PMC_CAP(NAME, VALUE, DESCR) PMC_CAP_##NAME = (1 << VALUE) ,
317 #define PMC_CAP_FIRST PMC_CAP_INTERRUPT
318 #define PMC_CAP_LAST PMC_CAP_CASCADE
323 * These are generated from the definitions in "dev/hwpmc/pmc_events.h".
328 #undef __PMC_EV_BLOCK
329 #define __PMC_EV_BLOCK(C,V) PMC_EV_ ## C ## __BLOCK_START = (V) - 1 ,
330 #define __PMC_EV(C,N) PMC_EV_ ## C ## _ ## N ,
335 * PMC SYSCALL INTERFACE
339 * "PMC_OPS" -- these are the commands recognized by the kernel
340 * module, and are used when performing a system call from userland.
342 #define __PMC_OPS() \
343 __PMC_OP(CONFIGURELOG, "Set log file") \
344 __PMC_OP(FLUSHLOG, "Flush log file") \
345 __PMC_OP(GETCPUINFO, "Get system CPU information") \
346 __PMC_OP(GETDRIVERSTATS, "Get driver statistics") \
347 __PMC_OP(GETMODULEVERSION, "Get module version") \
348 __PMC_OP(GETPMCINFO, "Get per-cpu PMC information") \
349 __PMC_OP(PMCADMIN, "Set PMC state") \
350 __PMC_OP(PMCALLOCATE, "Allocate and configure a PMC") \
351 __PMC_OP(PMCATTACH, "Attach a PMC to a process") \
352 __PMC_OP(PMCDETACH, "Detach a PMC from a process") \
353 __PMC_OP(PMCGETMSR, "Get a PMC's hardware address") \
354 __PMC_OP(PMCRELEASE, "Release a PMC") \
355 __PMC_OP(PMCRW, "Read/Set a PMC") \
356 __PMC_OP(PMCSETCOUNT, "Set initial count/sampling rate") \
357 __PMC_OP(PMCSTART, "Start a PMC") \
358 __PMC_OP(PMCSTOP, "Stop a PMC") \
359 __PMC_OP(WRITELOG, "Write a cookie to the log file") \
360 __PMC_OP(CLOSELOG, "Close log file") \
361 __PMC_OP(GETDYNEVENTINFO, "Get dynamic events list")
365 #define __PMC_OP(N, D) PMC_OP_##N,
370 * Flags used in operations on PMCs.
373 #define PMC_F_UNUSED1 0x00000001 /* unused */
374 #define PMC_F_DESCENDANTS 0x00000002 /*OP ALLOCATE track descendants */
375 #define PMC_F_LOG_PROCCSW 0x00000004 /*OP ALLOCATE track ctx switches */
376 #define PMC_F_LOG_PROCEXIT 0x00000008 /*OP ALLOCATE log proc exits */
377 #define PMC_F_NEWVALUE 0x00000010 /*OP RW write new value */
378 #define PMC_F_OLDVALUE 0x00000020 /*OP RW get old value */
381 #define PMC_F_CALLCHAIN 0x00000080 /*OP ALLOCATE capture callchains */
382 #define PMC_F_USERCALLCHAIN 0x00000100 /*OP ALLOCATE use userspace stack */
385 #define PMC_F_ATTACHED_TO_OWNER 0x00010000 /*attached to owner*/
386 #define PMC_F_NEEDS_LOGFILE 0x00020000 /*needs log file */
387 #define PMC_F_ATTACH_DONE 0x00040000 /*attached at least once */
389 #define PMC_CALLCHAIN_DEPTH_MAX 512
391 #define PMC_CC_F_USERSPACE 0x01 /*userspace callchain*/
394 * Cookies used to denote allocated PMCs, and the values of PMCs.
397 typedef uint32_t pmc_id_t;
398 typedef uint64_t pmc_value_t;
400 #define PMC_ID_INVALID (~ (pmc_id_t) 0)
403 * PMC IDs have the following format:
405 * +-----------------------+-------+-----------+
406 * | CPU | PMC MODE | CLASS | ROW INDEX |
407 * +-----------------------+-------+-----------+
409 * where CPU is 12 bits, MODE 8, CLASS 4, and ROW INDEX 8 Field 'CPU'
410 * is set to the requested CPU for system-wide PMCs or PMC_CPU_ANY for
411 * process-mode PMCs. Field 'PMC MODE' is the allocated PMC mode.
412 * Field 'PMC CLASS' is the class of the PMC. Field 'ROW INDEX' is the
413 * row index for the PMC.
415 * The 'ROW INDEX' ranges over 0..NWPMCS where NHWPMCS is the total
416 * number of hardware PMCs on this cpu.
419 #define PMC_ID_TO_ROWINDEX(ID) ((ID) & 0xFF)
420 #define PMC_ID_TO_CLASS(ID) (((ID) & 0xF00) >> 8)
421 #define PMC_ID_TO_MODE(ID) (((ID) & 0xFF000) >> 12)
422 #define PMC_ID_TO_CPU(ID) (((ID) & 0xFFF00000) >> 20)
423 #define PMC_ID_MAKE_ID(CPU,MODE,CLASS,ROWINDEX) \
424 ((((CPU) & 0xFFF) << 20) | (((MODE) & 0xFF) << 12) | \
425 (((CLASS) & 0xF) << 8) | ((ROWINDEX) & 0xFF))
428 * Data structures for system calls supported by the pmc driver.
434 * Allocate a PMC on the named CPU.
437 #define PMC_CPU_ANY ~0
439 struct pmc_op_pmcallocate {
440 uint32_t pm_caps; /* PMC_CAP_* */
441 uint32_t pm_cpu; /* CPU number or PMC_CPU_ANY */
442 enum pmc_class pm_class; /* class of PMC desired */
443 enum pmc_event pm_ev; /* [enum pmc_event] desired */
444 uint32_t pm_flags; /* additional modifiers PMC_F_* */
445 enum pmc_mode pm_mode; /* desired mode */
446 pmc_id_t pm_pmcid; /* [return] process pmc id */
447 pmc_value_t pm_count; /* initial/sample count */
449 union pmc_md_op_pmcallocate pm_md; /* MD layer extensions */
455 * Set the administrative state (i.e., whether enabled or disabled) of
456 * a PMC 'pm_pmc' on CPU 'pm_cpu'. Note that 'pm_pmc' specifies an
457 * absolute PMC number and need not have been first allocated by the
461 struct pmc_op_pmcadmin {
462 int pm_cpu; /* CPU# */
463 uint32_t pm_flags; /* flags */
464 int pm_pmc; /* PMC# */
465 enum pmc_state pm_state; /* desired state */
469 * OP PMCATTACH / OP PMCDETACH
471 * Attach/detach a PMC and a process.
474 struct pmc_op_pmcattach {
475 pmc_id_t pm_pmc; /* PMC to attach to */
476 pid_t pm_pid; /* target process */
482 * Set the sampling rate (i.e., the reload count) for statistical counters.
483 * 'pm_pmcid' need to have been previously allocated using PMCALLOCATE.
486 struct pmc_op_pmcsetcount {
487 pmc_value_t pm_count; /* initial/sample count */
488 pmc_id_t pm_pmcid; /* PMC id to set */
494 * Read the value of a PMC named by 'pm_pmcid'. 'pm_pmcid' needs
495 * to have been previously allocated using PMCALLOCATE.
498 struct pmc_op_pmcrw {
499 uint32_t pm_flags; /* PMC_F_{OLD,NEW}VALUE*/
500 pmc_id_t pm_pmcid; /* pmc id */
501 pmc_value_t pm_value; /* new&returned value */
507 * retrieve PMC state for a named CPU. The caller is expected to
508 * allocate 'npmc' * 'struct pmc_info' bytes of space for the return
513 char pm_name[PMC_NAME_MAX]; /* pmc name */
514 enum pmc_class pm_class; /* enum pmc_class */
515 int pm_enabled; /* whether enabled */
516 enum pmc_disp pm_rowdisp; /* FREE, THREAD or STANDLONE */
517 pid_t pm_ownerpid; /* owner, or -1 */
518 enum pmc_mode pm_mode; /* current mode [enum pmc_mode] */
519 enum pmc_event pm_event; /* current event */
520 uint32_t pm_flags; /* current flags */
521 pmc_value_t pm_reloadcount; /* sampling counters only */
524 struct pmc_op_getpmcinfo {
525 int32_t pm_cpu; /* 0 <= cpu < mp_maxid */
526 struct pmc_info pm_pmcs[]; /* space for 'npmc' structures */
532 * Retrieve system CPU information.
535 struct pmc_classinfo {
536 enum pmc_class pm_class; /* class id */
537 uint32_t pm_caps; /* counter capabilities */
538 uint32_t pm_width; /* width of the PMC */
539 uint32_t pm_num; /* number of PMCs in class */
542 struct pmc_op_getcpuinfo {
543 enum pmc_cputype pm_cputype; /* what kind of CPU */
544 uint32_t pm_ncpu; /* max CPU number */
545 uint32_t pm_npmc; /* #PMCs per CPU */
546 uint32_t pm_nclass; /* #classes of PMCs */
547 struct pmc_classinfo pm_classes[PMC_CLASS_MAX];
553 * Configure a log file for writing system-wide statistics to.
556 struct pmc_op_configurelog {
558 int pm_logfd; /* logfile fd (or -1) */
564 * Retrieve pmc(4) driver-wide statistics.
567 struct pmc_driverstats {
568 counter_u64_t pm_intr_ignored; /* #interrupts ignored */
569 counter_u64_t pm_intr_processed; /* #interrupts processed */
570 counter_u64_t pm_intr_bufferfull; /* #interrupts with ENOSPC */
571 counter_u64_t pm_syscalls; /* #syscalls */
572 counter_u64_t pm_syscall_errors; /* #syscalls with errors */
573 counter_u64_t pm_buffer_requests; /* #buffer requests */
574 counter_u64_t pm_buffer_requests_failed; /* #failed buffer requests */
575 counter_u64_t pm_log_sweeps; /* #sample buffer processing
577 counter_u64_t pm_merges; /* merged k+u */
578 counter_u64_t pm_overwrites; /* UR overwrites */
582 struct pmc_op_getdriverstats {
583 unsigned int pm_intr_ignored; /* #interrupts ignored */
584 unsigned int pm_intr_processed; /* #interrupts processed */
585 unsigned int pm_intr_bufferfull; /* #interrupts with ENOSPC */
586 unsigned int pm_syscalls; /* #syscalls */
587 unsigned int pm_syscall_errors; /* #syscalls with errors */
588 unsigned int pm_buffer_requests; /* #buffer requests */
589 unsigned int pm_buffer_requests_failed; /* #failed buffer requests */
590 unsigned int pm_log_sweeps; /* #sample buffer processing
595 * OP RELEASE / OP START / OP STOP
597 * Simple operations on a PMC id.
600 struct pmc_op_simple {
607 * Flush the current log buffer and write 4 bytes of user data to it.
610 struct pmc_op_writelog {
611 uint32_t pm_userdata;
617 * Retrieve the machine specific address associated with the allocated
618 * PMC. This number can be used subsequently with a read-performance-counter
622 struct pmc_op_getmsr {
623 uint32_t pm_msr; /* machine specific address */
624 pmc_id_t pm_pmcid; /* allocated pmc id */
630 * Retrieve a PMC dynamic class events list.
633 struct pmc_dyn_event_descr {
634 char pm_ev_name[PMC_NAME_MAX];
635 enum pmc_event pm_ev_code;
638 struct pmc_op_getdyneventinfo {
639 enum pmc_class pm_class;
640 unsigned int pm_nevent;
641 struct pmc_dyn_event_descr pm_events[PMC_EV_DYN_COUNT];
646 #include <sys/malloc.h>
647 #include <sys/sysctl.h>
648 #include <sys/_cpuset.h>
650 #include <machine/frame.h>
652 #define PMC_HASH_SIZE 1024
653 #define PMC_MTXPOOL_SIZE 2048
654 #define PMC_LOG_BUFFER_SIZE 256
655 #define PMC_NLOGBUFFERS_PCPU 32
656 #define PMC_NSAMPLES 256
657 #define PMC_CALLCHAIN_DEPTH 128
658 #define PMC_THREADLIST_MAX 128
660 #define PMC_SYSCTL_NAME_PREFIX "kern." PMC_MODULE_NAME "."
665 * (b) - pmc_bufferlist_mtx (spin lock)
666 * (k) - pmc_kthread_mtx (sleep lock)
667 * (o) - po->po_mtx (spin lock)
668 * (g) - global_epoch_preempt (epoch)
676 struct pmc_syscall_args {
677 register_t pmop_code; /* one of PMC_OP_* */
678 void *pmop_data; /* syscall parameter */
682 * Interface to processor specific s1tuff
688 * Machine independent (i.e., the common parts) of a human readable
693 char pd_name[PMC_NAME_MAX]; /* name */
694 uint32_t pd_caps; /* capabilities */
695 enum pmc_class pd_class; /* class of the PMC */
696 uint32_t pd_width; /* width in bits */
702 * This structure records all the target processes associated with a
707 LIST_ENTRY(pmc_target) pt_next;
708 struct pmc_process *pt_process; /* target descriptor */
714 * Describes each allocated PMC.
716 * Each PMC has precisely one owner, namely the process that allocated
719 * A PMC may be attached to multiple target processes. The
720 * 'pm_targets' field links all the target processes being monitored
723 * The 'pm_savedvalue' field is protected by a mutex.
725 * On a multi-cpu machine, multiple target threads associated with a
726 * process-virtual PMC could be concurrently executing on different
727 * CPUs. The 'pm_runcount' field is atomically incremented every time
728 * the PMC gets scheduled on a CPU and atomically decremented when it
729 * get descheduled. Deletion of a PMC is only permitted when this
733 struct pmc_pcpu_state {
734 uint32_t pps_overflowcnt; /* count overflow interrupts */
736 uint8_t pps_cpustate;
737 } __aligned(CACHE_LINE_SIZE);
739 LIST_HEAD(,pmc_target) pm_targets; /* list of target processes */
740 LIST_ENTRY(pmc) pm_next; /* owner's list */
743 * System-wide PMCs are allocated on a CPU and are not moved
744 * around. For system-wide PMCs we record the CPU the PMC was
745 * allocated on in the 'CPU' field of the pmc ID.
747 * Virtual PMCs run on whichever CPU is currently executing
748 * their targets' threads. For these PMCs we need to save
749 * their current PMC counter values when they are taken off
754 pmc_value_t pm_savedvalue; /* Virtual PMCS */
758 * For sampling mode PMCs, we keep track of the PMC's "reload
759 * count", which is the counter value to be loaded in when
760 * arming the PMC for the next counting session. For counting
761 * modes on PMCs that are read-only (e.g., the x86 TSC), we
762 * keep track of the initial value at the start of
763 * counting-mode operation.
767 pmc_value_t pm_reloadcount; /* sampling PMC modes */
768 pmc_value_t pm_initial; /* counting PMC modes */
771 struct pmc_pcpu_state *pm_pcpu_state;
772 volatile cpuset_t pm_cpustate; /* CPUs where PMC should be active */
773 uint32_t pm_caps; /* PMC capabilities */
774 enum pmc_event pm_event; /* event being measured */
775 uint32_t pm_flags; /* additional flags PMC_F_... */
776 struct pmc_owner *pm_owner; /* owner thread state */
777 counter_u64_t pm_runcount; /* #cpus currently on */
778 enum pmc_state pm_state; /* current PMC state */
781 * The PMC ID field encodes the row-index for the PMC, its
782 * mode, class and the CPU# associated with the PMC.
785 pmc_id_t pm_id; /* allocated PMC id */
786 enum pmc_class pm_class;
789 union pmc_md_pmc pm_md;
793 * Accessor macros for 'struct pmc'
796 #define PMC_TO_MODE(P) PMC_ID_TO_MODE((P)->pm_id)
797 #define PMC_TO_CLASS(P) PMC_ID_TO_CLASS((P)->pm_id)
798 #define PMC_TO_ROWINDEX(P) PMC_ID_TO_ROWINDEX((P)->pm_id)
799 #define PMC_TO_CPU(P) PMC_ID_TO_CPU((P)->pm_id)
802 * struct pmc_threadpmcstate
804 * Record per-PMC, per-thread state.
806 struct pmc_threadpmcstate {
807 pmc_value_t pt_pmcval; /* per-thread reload count */
813 * Record a 'target' thread being profiled.
816 LIST_ENTRY(pmc_thread) pt_next; /* linked list */
817 struct thread *pt_td; /* target thread */
818 struct pmc_threadpmcstate pt_pmcs[]; /* per-PMC state */
824 * Record a 'target' process being profiled.
826 * The target process being profiled could be different from the owner
827 * process which allocated the PMCs. Each target process descriptor
828 * is associated with NHWPMC 'struct pmc *' pointers. Each PMC at a
829 * given hardware row-index 'n' will use slot 'n' of the 'pp_pmcs[]'
830 * array. The size of this structure is thus PMC architecture
835 struct pmc_targetstate {
836 struct pmc *pp_pmc; /* target PMC */
837 pmc_value_t pp_pmcval; /* per-process value */
841 LIST_ENTRY(pmc_process) pp_next; /* hash chain */
842 LIST_HEAD(,pmc_thread) pp_tds; /* list of threads */
843 struct mtx *pp_tdslock; /* lock on pp_tds thread list */
844 int pp_refcnt; /* reference count */
845 uint32_t pp_flags; /* flags PMC_PP_* */
846 struct proc *pp_proc; /* target process */
847 struct pmc_targetstate pp_pmcs[]; /* NHWPMCs */
850 #define PMC_PP_ENABLE_MSR_ACCESS 0x00000001
855 * We associate a PMC with an 'owner' process.
857 * A process can be associated with 0..NCPUS*NHWPMC PMCs during its
858 * lifetime, where NCPUS is the numbers of CPUS in the system and
859 * NHWPMC is the number of hardware PMCs per CPU. These are
860 * maintained in the list headed by the 'po_pmcs' to save on space.
865 LIST_ENTRY(pmc_owner) po_next; /* hash chain */
866 CK_LIST_ENTRY(pmc_owner) po_ssnext; /* (g/p) list of SS PMC owners */
867 LIST_HEAD(, pmc) po_pmcs; /* owned PMC list */
868 TAILQ_HEAD(, pmclog_buffer) po_logbuffers; /* (o) logbuffer list */
869 struct mtx po_mtx; /* spin lock for (o) */
870 struct proc *po_owner; /* owner proc */
871 uint32_t po_flags; /* (k) flags PMC_PO_* */
872 struct proc *po_kthread; /* (k) helper kthread */
873 struct file *po_file; /* file reference */
874 int po_error; /* recorded error */
875 short po_sscount; /* # SS PMCs owned */
876 short po_logprocmaps; /* global mappings done */
877 struct pmclog_buffer *po_curbuf[MAXCPU]; /* current log buffer */
880 #define PMC_PO_OWNS_LOGFILE 0x00000001 /* has a log file */
881 #define PMC_PO_SHUTDOWN 0x00000010 /* in the process of shutdown */
882 #define PMC_PO_INITIAL_MAPPINGS_DONE 0x00000020
885 * struct pmc_hw -- describe the state of the PMC hardware
887 * When in use, a HW PMC is associated with one allocated 'struct pmc'
888 * pointed to by field 'phw_pmc'. When inactive, this field is NULL.
890 * On an SMP box, one or more HW PMC's in process virtual mode with
891 * the same 'phw_pmc' could be executing on different CPUs. In order
892 * to handle this case correctly, we need to ensure that only
893 * incremental counts get added to the saved value in the associated
894 * 'struct pmc'. The 'phw_save' field is used to keep the saved PMC
895 * value at the time the hardware is started during this context
896 * switch (i.e., the difference between the new (hardware) count and
897 * the saved count is atomically added to the count field in 'struct
898 * pmc' at context switch time).
903 uint32_t phw_state; /* see PHW_* macros below */
904 struct pmc *phw_pmc; /* current thread PMC */
907 #define PMC_PHW_RI_MASK 0x000000FF
908 #define PMC_PHW_CPU_SHIFT 8
909 #define PMC_PHW_CPU_MASK 0x0000FF00
910 #define PMC_PHW_FLAGS_SHIFT 16
911 #define PMC_PHW_FLAGS_MASK 0xFFFF0000
913 #define PMC_PHW_INDEX_TO_STATE(ri) ((ri) & PMC_PHW_RI_MASK)
914 #define PMC_PHW_STATE_TO_INDEX(state) ((state) & PMC_PHW_RI_MASK)
915 #define PMC_PHW_CPU_TO_STATE(cpu) (((cpu) << PMC_PHW_CPU_SHIFT) & \
917 #define PMC_PHW_STATE_TO_CPU(state) (((state) & PMC_PHW_CPU_MASK) >> \
919 #define PMC_PHW_FLAGS_TO_STATE(flags) (((flags) << PMC_PHW_FLAGS_SHIFT) & \
921 #define PMC_PHW_STATE_TO_FLAGS(state) (((state) & PMC_PHW_FLAGS_MASK) >> \
923 #define PMC_PHW_FLAG_IS_ENABLED (PMC_PHW_FLAGS_TO_STATE(0x01))
924 #define PMC_PHW_FLAG_IS_SHAREABLE (PMC_PHW_FLAGS_TO_STATE(0x02))
929 * Space for N (tunable) PC samples and associated control data.
933 uint16_t ps_nsamples; /* callchain depth */
934 uint16_t ps_nsamples_actual;
935 uint16_t ps_cpu; /* cpu number */
936 uint16_t ps_flags; /* other flags */
937 lwpid_t ps_tid; /* thread id */
938 pid_t ps_pid; /* process PID or -1 */
939 int ps_ticks; /* ticks at sample time */
941 struct thread *ps_td; /* which thread */
942 struct pmc *ps_pmc; /* interrupting PMC */
943 uintptr_t *ps_pc; /* (const) callchain start */
944 uint64_t ps_tsc; /* tsc value */
947 #define PMC_SAMPLE_FREE ((uint16_t) 0)
948 #define PMC_USER_CALLCHAIN_PENDING ((uint16_t) 0xFFFF)
950 struct pmc_samplebuffer {
951 volatile uint64_t ps_prodidx; /* producer index */
952 volatile uint64_t ps_considx; /* consumer index */
953 uintptr_t *ps_callchains; /* all saved call chains */
954 struct pmc_sample ps_samples[]; /* array of sample entries */
957 #define PMC_CONS_SAMPLE(psb) \
958 (&(psb)->ps_samples[(psb)->ps_considx & pmc_sample_mask])
960 #define PMC_CONS_SAMPLE_OFF(psb, off) \
961 (&(psb)->ps_samples[(off) & pmc_sample_mask])
963 #define PMC_PROD_SAMPLE(psb) \
964 (&(psb)->ps_samples[(psb)->ps_prodidx & pmc_sample_mask])
967 * struct pmc_cpustate
969 * A CPU is modelled as a collection of HW PMCs with space for additional
974 uint32_t pc_state; /* physical cpu number + flags */
975 struct pmc_samplebuffer *pc_sb[3]; /* space for samples */
976 struct pmc_hw *pc_hwpmcs[]; /* 'npmc' pointers */
979 #define PMC_PCPU_CPU_MASK 0x000000FF
980 #define PMC_PCPU_FLAGS_MASK 0xFFFFFF00
981 #define PMC_PCPU_FLAGS_SHIFT 8
982 #define PMC_PCPU_STATE_TO_CPU(S) ((S) & PMC_PCPU_CPU_MASK)
983 #define PMC_PCPU_STATE_TO_FLAGS(S) (((S) & PMC_PCPU_FLAGS_MASK) >> PMC_PCPU_FLAGS_SHIFT)
984 #define PMC_PCPU_FLAGS_TO_STATE(F) (((F) << PMC_PCPU_FLAGS_SHIFT) & PMC_PCPU_FLAGS_MASK)
985 #define PMC_PCPU_CPU_TO_STATE(C) ((C) & PMC_PCPU_CPU_MASK)
986 #define PMC_PCPU_FLAG_HTT (PMC_PCPU_FLAGS_TO_STATE(0x1))
991 * CPU binding information.
995 int pb_bound; /* is bound? */
996 int pb_cpu; /* if so, to which CPU */
1002 * struct pmc_classdep
1004 * PMC class-dependent operations.
1006 struct pmc_classdep {
1007 uint32_t pcd_caps; /* class capabilities */
1008 enum pmc_class pcd_class; /* class id */
1009 int pcd_num; /* number of PMCs */
1010 int pcd_ri; /* row index of the first PMC in class */
1011 int pcd_width; /* width of the PMC */
1013 /* configuring/reading/writing the hardware PMCs */
1014 int (*pcd_config_pmc)(int _cpu, int _ri, struct pmc *_pm);
1015 int (*pcd_get_config)(int _cpu, int _ri, struct pmc **_ppm);
1016 int (*pcd_read_pmc)(int _cpu, int _ri, pmc_value_t *_value);
1017 int (*pcd_write_pmc)(int _cpu, int _ri, pmc_value_t _value);
1019 /* pmc allocation/release */
1020 int (*pcd_allocate_pmc)(int _cpu, int _ri, struct pmc *_t,
1021 const struct pmc_op_pmcallocate *_a);
1022 int (*pcd_release_pmc)(int _cpu, int _ri, struct pmc *_pm);
1024 /* starting and stopping PMCs */
1025 int (*pcd_start_pmc)(int _cpu, int _ri);
1026 int (*pcd_stop_pmc)(int _cpu, int _ri);
1029 int (*pcd_describe)(int _cpu, int _ri, struct pmc_info *_pi,
1030 struct pmc **_ppmc);
1032 /* class-dependent initialization & finalization */
1033 int (*pcd_pcpu_init)(struct pmc_mdep *_md, int _cpu);
1034 int (*pcd_pcpu_fini)(struct pmc_mdep *_md, int _cpu);
1036 /* machine-specific interface */
1037 int (*pcd_get_msr)(int _ri, uint32_t *_msr);
1043 * Machine dependent bits needed per CPU type.
1047 uint32_t pmd_cputype; /* from enum pmc_cputype */
1048 uint32_t pmd_npmc; /* number of PMCs per CPU */
1049 uint32_t pmd_nclass; /* number of PMC classes present */
1052 * Machine dependent methods.
1055 /* per-cpu initialization and finalization */
1056 int (*pmd_pcpu_init)(struct pmc_mdep *_md, int _cpu);
1057 int (*pmd_pcpu_fini)(struct pmc_mdep *_md, int _cpu);
1059 /* thread context switch in/out */
1060 int (*pmd_switch_in)(struct pmc_cpu *_p, struct pmc_process *_pp);
1061 int (*pmd_switch_out)(struct pmc_cpu *_p, struct pmc_process *_pp);
1063 /* handle a PMC interrupt */
1064 int (*pmd_intr)(struct trapframe *_tf);
1067 * PMC class dependent information.
1069 struct pmc_classdep pmd_classdep[];
1073 * Per-CPU state. This is an array of 'mp_ncpu' pointers
1074 * to struct pmc_cpu descriptors.
1077 extern struct pmc_cpu **pmc_pcpu;
1079 /* driver statistics */
1080 extern struct pmc_driverstats pmc_stats;
1082 #if defined(HWPMC_DEBUG)
1083 #include <sys/ktr.h>
1085 /* debug flags, major flag groups */
1086 struct pmc_debugflags {
1098 extern struct pmc_debugflags pmc_debugflags;
1100 #define KTR_PMC KTR_SUBSYS
1102 #define PMC_DEBUG_STRSIZE 128
1103 #define PMC_DEBUG_DEFAULT_FLAGS { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
1105 #define PMCDBG0(M, N, L, F) do { \
1106 if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
1107 CTR0(KTR_PMC, #M ":" #N ":" #L ": " F); \
1109 #define PMCDBG1(M, N, L, F, p1) do { \
1110 if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
1111 CTR1(KTR_PMC, #M ":" #N ":" #L ": " F, p1); \
1113 #define PMCDBG2(M, N, L, F, p1, p2) do { \
1114 if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
1115 CTR2(KTR_PMC, #M ":" #N ":" #L ": " F, p1, p2); \
1117 #define PMCDBG3(M, N, L, F, p1, p2, p3) do { \
1118 if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
1119 CTR3(KTR_PMC, #M ":" #N ":" #L ": " F, p1, p2, p3); \
1121 #define PMCDBG4(M, N, L, F, p1, p2, p3, p4) do { \
1122 if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
1123 CTR4(KTR_PMC, #M ":" #N ":" #L ": " F, p1, p2, p3, p4);\
1125 #define PMCDBG5(M, N, L, F, p1, p2, p3, p4, p5) do { \
1126 if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
1127 CTR5(KTR_PMC, #M ":" #N ":" #L ": " F, p1, p2, p3, p4, \
1130 #define PMCDBG6(M, N, L, F, p1, p2, p3, p4, p5, p6) do { \
1131 if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
1132 CTR6(KTR_PMC, #M ":" #N ":" #L ": " F, p1, p2, p3, p4, \
1137 #define PMC_DEBUG_MAJ_CPU 0 /* cpu switches */
1138 #define PMC_DEBUG_MAJ_CSW 1 /* context switches */
1139 #define PMC_DEBUG_MAJ_LOG 2 /* logging */
1140 #define PMC_DEBUG_MAJ_MDP 3 /* machine dependent */
1141 #define PMC_DEBUG_MAJ_MOD 4 /* misc module infrastructure */
1142 #define PMC_DEBUG_MAJ_OWN 5 /* owner */
1143 #define PMC_DEBUG_MAJ_PMC 6 /* pmc management */
1144 #define PMC_DEBUG_MAJ_PRC 7 /* processes */
1145 #define PMC_DEBUG_MAJ_SAM 8 /* sampling */
1149 /* Common (8 bits) */
1150 #define PMC_DEBUG_MIN_ALL 0 /* allocation */
1151 #define PMC_DEBUG_MIN_REL 1 /* release */
1152 #define PMC_DEBUG_MIN_OPS 2 /* ops: start, stop, ... */
1153 #define PMC_DEBUG_MIN_INI 3 /* init */
1154 #define PMC_DEBUG_MIN_FND 4 /* find */
1157 #define PMC_DEBUG_MIN_PMH 14 /* pmc_hook */
1158 #define PMC_DEBUG_MIN_PMS 15 /* pmc_syscall */
1161 #define PMC_DEBUG_MIN_ORM 8 /* owner remove */
1162 #define PMC_DEBUG_MIN_OMR 9 /* owner maybe remove */
1165 #define PMC_DEBUG_MIN_TLK 8 /* link target */
1166 #define PMC_DEBUG_MIN_TUL 9 /* unlink target */
1167 #define PMC_DEBUG_MIN_EXT 10 /* process exit */
1168 #define PMC_DEBUG_MIN_EXC 11 /* process exec */
1169 #define PMC_DEBUG_MIN_FRK 12 /* process fork */
1170 #define PMC_DEBUG_MIN_ATT 13 /* attach/detach */
1171 #define PMC_DEBUG_MIN_SIG 14 /* signalling */
1173 /* CONTEXT SWITCHES */
1174 #define PMC_DEBUG_MIN_SWI 8 /* switch in */
1175 #define PMC_DEBUG_MIN_SWO 9 /* switch out */
1178 #define PMC_DEBUG_MIN_REG 8 /* pmc register */
1179 #define PMC_DEBUG_MIN_ALR 9 /* allocate row */
1181 /* MACHINE DEPENDENT LAYER */
1182 #define PMC_DEBUG_MIN_REA 8 /* read */
1183 #define PMC_DEBUG_MIN_WRI 9 /* write */
1184 #define PMC_DEBUG_MIN_CFG 10 /* config */
1185 #define PMC_DEBUG_MIN_STA 11 /* start */
1186 #define PMC_DEBUG_MIN_STO 12 /* stop */
1187 #define PMC_DEBUG_MIN_INT 13 /* interrupts */
1190 #define PMC_DEBUG_MIN_BND 8 /* bind */
1191 #define PMC_DEBUG_MIN_SEL 9 /* select */
1194 #define PMC_DEBUG_MIN_GTB 8 /* get buf */
1195 #define PMC_DEBUG_MIN_SIO 9 /* schedule i/o */
1196 #define PMC_DEBUG_MIN_FLS 10 /* flush */
1197 #define PMC_DEBUG_MIN_SAM 11 /* sample */
1198 #define PMC_DEBUG_MIN_CLO 12 /* close */
1201 #define PMCDBG0(M, N, L, F) /* nothing */
1202 #define PMCDBG1(M, N, L, F, p1)
1203 #define PMCDBG2(M, N, L, F, p1, p2)
1204 #define PMCDBG3(M, N, L, F, p1, p2, p3)
1205 #define PMCDBG4(M, N, L, F, p1, p2, p3, p4)
1206 #define PMCDBG5(M, N, L, F, p1, p2, p3, p4, p5)
1207 #define PMCDBG6(M, N, L, F, p1, p2, p3, p4, p5, p6)
1210 /* declare a dedicated memory pool */
1211 MALLOC_DECLARE(M_PMC);
1217 struct pmc_mdep *pmc_md_initialize(void); /* MD init function */
1218 void pmc_md_finalize(struct pmc_mdep *_md); /* MD fini function */
1219 int pmc_getrowdisp(int _ri);
1220 int pmc_process_interrupt(int _ring, struct pmc *_pm, struct trapframe *_tf);
1221 int pmc_save_kernel_callchain(uintptr_t *_cc, int _maxsamples,
1222 struct trapframe *_tf);
1223 int pmc_save_user_callchain(uintptr_t *_cc, int _maxsamples,
1224 struct trapframe *_tf);
1225 struct pmc_mdep *pmc_mdep_alloc(int nclasses);
1226 void pmc_mdep_free(struct pmc_mdep *md);
1227 uint64_t pmc_rdtsc(void);
1228 #endif /* _KERNEL */
1229 #endif /* _SYS_PMC_H_ */