2 * Copyright (c) 2003-2007, Joseph Koshy
3 * Copyright (c) 2007 The FreeBSD Foundation
6 * Portions of this software were developed by A. Joseph Koshy under
7 * sponsorship from the FreeBSD Foundation and Google, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <dev/hwpmc/pmc_events.h>
38 #include <machine/pmc_mdep.h>
39 #include <machine/profile.h>
41 #define PMC_MODULE_NAME "hwpmc"
42 #define PMC_NAME_MAX 16 /* HW counter name size */
43 #define PMC_CLASS_MAX 4 /* #classes of PMCs in a system */
46 * Kernel<->userland API version number [MMmmpppp]
48 * Major numbers are to be incremented when an incompatible change to
49 * the ABI occurs that older clients will not be able to handle.
51 * Minor numbers are incremented when a backwards compatible change
52 * occurs that allows older correct programs to run unchanged. For
53 * example, when support for a new PMC type is added.
55 * The patch version is incremented for every bug fix.
57 #define PMC_VERSION_MAJOR 0x03
58 #define PMC_VERSION_MINOR 0x00
59 #define PMC_VERSION_PATCH 0x0000
61 #define PMC_VERSION (PMC_VERSION_MAJOR << 24 | \
62 PMC_VERSION_MINOR << 16 | PMC_VERSION_PATCH)
68 #define __PMC_CPUS() \
69 __PMC_CPU(AMD_K7, "AMD K7") \
70 __PMC_CPU(AMD_K8, "AMD K8") \
71 __PMC_CPU(INTEL_P5, "Intel Pentium") \
72 __PMC_CPU(INTEL_P6, "Intel Pentium Pro") \
73 __PMC_CPU(INTEL_CL, "Intel Celeron") \
74 __PMC_CPU(INTEL_PII, "Intel Pentium II") \
75 __PMC_CPU(INTEL_PIII, "Intel Pentium III") \
76 __PMC_CPU(INTEL_PM, "Intel Pentium M") \
77 __PMC_CPU(INTEL_PIV, "Intel Pentium IV")
81 #define __PMC_CPU(S,D) PMC_CPU_##S ,
85 #define PMC_CPU_FIRST PMC_CPU_AMD_K7
86 #define PMC_CPU_LAST PMC_CPU_INTEL_PIV
92 #define __PMC_CLASSES() \
93 __PMC_CLASS(TSC) /* CPU Timestamp counter */ \
94 __PMC_CLASS(K7) /* AMD K7 performance counters */ \
95 __PMC_CLASS(K8) /* AMD K8 performance counters */ \
96 __PMC_CLASS(P5) /* Intel Pentium counters */ \
97 __PMC_CLASS(P6) /* Intel Pentium Pro counters */ \
98 __PMC_CLASS(P4) /* Intel Pentium-IV counters */
102 #define __PMC_CLASS(N) PMC_CLASS_##N ,
106 #define PMC_CLASS_FIRST PMC_CLASS_TSC
107 #define PMC_CLASS_LAST PMC_CLASS_P4
110 * A PMC can be in the following states:
113 * DISABLED -- administratively prohibited from being used.
114 * FREE -- HW available for use
116 * ALLOCATED -- allocated
117 * STOPPED -- allocated, but not counting events
118 * RUNNING -- allocated, and in operation; 'pm_runcount'
119 * holds the number of CPUs using this PMC at
121 * DELETED -- being destroyed
124 #define __PMC_HWSTATES() \
125 __PMC_STATE(DISABLED) \
128 #define __PMC_SWSTATES() \
129 __PMC_STATE(ALLOCATED) \
130 __PMC_STATE(STOPPED) \
131 __PMC_STATE(RUNNING) \
134 #define __PMC_STATES() \
140 #define __PMC_STATE(S) PMC_STATE_##S,
145 #define PMC_STATE_FIRST PMC_STATE_DISABLED
146 #define PMC_STATE_LAST PMC_STATE_DELETED
149 * An allocated PMC may used as a 'global' counter or as a
150 * 'thread-private' one. Each such mode of use can be in either
151 * statistical sampling mode or in counting mode. Thus a PMC in use
153 * SS i.e., SYSTEM STATISTICAL -- system-wide statistical profiling
154 * SC i.e., SYSTEM COUNTER -- system-wide counting mode
155 * TS i.e., THREAD STATISTICAL -- thread virtual, statistical profiling
156 * TC i.e., THREAD COUNTER -- thread virtual, counting mode
158 * Statistical profiling modes rely on the PMC periodically delivering
159 * a interrupt to the CPU (when the configured number of events have
160 * been measured), so the PMC must have the ability to generate
163 * In counting modes, the PMC counts its configured events, with the
164 * value of the PMC being read whenever needed by its owner process.
166 * The thread specific modes "virtualize" the PMCs -- the PMCs appear
167 * to be thread private and count events only when the profiled thread
168 * actually executes on the CPU.
170 * The system-wide "global" modes keep the PMCs running all the time
171 * and are used to measure the behaviour of the whole system.
174 #define __PMC_MODES() \
182 #define __PMC_MODE(M,N) PMC_MODE_##M = N,
186 #define PMC_MODE_FIRST PMC_MODE_SS
187 #define PMC_MODE_LAST PMC_MODE_TC
189 #define PMC_IS_COUNTING_MODE(mode) \
190 ((mode) == PMC_MODE_SC || (mode) == PMC_MODE_TC)
191 #define PMC_IS_SYSTEM_MODE(mode) \
192 ((mode) == PMC_MODE_SS || (mode) == PMC_MODE_SC)
193 #define PMC_IS_SAMPLING_MODE(mode) \
194 ((mode) == PMC_MODE_SS || (mode) == PMC_MODE_TS)
195 #define PMC_IS_VIRTUAL_MODE(mode) \
196 ((mode) == PMC_MODE_TS || (mode) == PMC_MODE_TC)
199 * PMC row disposition
202 #define __PMC_DISPOSITIONS(N) \
203 __PMC_DISP(STANDALONE) /* global/disabled counters */ \
204 __PMC_DISP(FREE) /* free/available */ \
205 __PMC_DISP(THREAD) /* thread-virtual PMCs */ \
206 __PMC_DISP(UNKNOWN) /* sentinel */
210 #define __PMC_DISP(D) PMC_DISP_##D ,
214 #define PMC_DISP_FIRST PMC_DISP_STANDALONE
215 #define PMC_DISP_LAST PMC_DISP_THREAD
218 * Counter capabilities
220 * __PMC_CAPS(NAME, VALUE, DESCRIPTION)
223 #define __PMC_CAPS() \
224 __PMC_CAP(INTERRUPT, 0, "generate interrupts") \
225 __PMC_CAP(USER, 1, "count user-mode events") \
226 __PMC_CAP(SYSTEM, 2, "count system-mode events") \
227 __PMC_CAP(EDGE, 3, "do edge detection of events") \
228 __PMC_CAP(THRESHOLD, 4, "ignore events below a threshold") \
229 __PMC_CAP(READ, 5, "read PMC counter") \
230 __PMC_CAP(WRITE, 6, "reprogram PMC counter") \
231 __PMC_CAP(INVERT, 7, "invert comparision sense") \
232 __PMC_CAP(QUALIFIER, 8, "further qualify monitored events") \
233 __PMC_CAP(PRECISE, 9, "perform precise sampling") \
234 __PMC_CAP(TAGGING, 10, "tag upstream events") \
235 __PMC_CAP(CASCADE, 11, "cascade counters")
240 #define __PMC_CAP(NAME, VALUE, DESCR) PMC_CAP_##NAME = (1 << VALUE) ,
244 #define PMC_CAP_FIRST PMC_CAP_INTERRUPT
245 #define PMC_CAP_LAST PMC_CAP_CASCADE
250 * These are generated from the definitions in "dev/hwpmc/pmc_events.h".
255 #define __PMC_EV(C,N,D) PMC_EV_ ## C ## _ ## N ,
259 #define PMC_EVENT_FIRST PMC_EV_TSC_TSC
260 #define PMC_EVENT_LAST PMC_EV_P5_LAST
263 * PMC SYSCALL INTERFACE
267 * "PMC_OPS" -- these are the commands recognized by the kernel
268 * module, and are used when performing a system call from userland.
270 #define __PMC_OPS() \
271 __PMC_OP(CONFIGURELOG, "Set log file") \
272 __PMC_OP(FLUSHLOG, "Flush log file") \
273 __PMC_OP(GETCPUINFO, "Get system CPU information") \
274 __PMC_OP(GETDRIVERSTATS, "Get driver statistics") \
275 __PMC_OP(GETMODULEVERSION, "Get module version") \
276 __PMC_OP(GETPMCINFO, "Get per-cpu PMC information") \
277 __PMC_OP(PMCADMIN, "Set PMC state") \
278 __PMC_OP(PMCALLOCATE, "Allocate and configure a PMC") \
279 __PMC_OP(PMCATTACH, "Attach a PMC to a process") \
280 __PMC_OP(PMCDETACH, "Detach a PMC from a process") \
281 __PMC_OP(PMCGETMSR, "Get a PMC's hardware address") \
282 __PMC_OP(PMCRELEASE, "Release a PMC") \
283 __PMC_OP(PMCRW, "Read/Set a PMC") \
284 __PMC_OP(PMCSETCOUNT, "Set initial count/sampling rate") \
285 __PMC_OP(PMCSTART, "Start a PMC") \
286 __PMC_OP(PMCSTOP, "Start a PMC") \
287 __PMC_OP(WRITELOG, "Write a cookie to the log file")
291 #define __PMC_OP(N, D) PMC_OP_##N,
297 * Flags used in operations on PMCs.
300 #define PMC_F_FORCE 0x00000001 /*OP ADMIN force operation */
301 #define PMC_F_DESCENDANTS 0x00000002 /*OP ALLOCATE track descendants */
302 #define PMC_F_LOG_PROCCSW 0x00000004 /*OP ALLOCATE track ctx switches */
303 #define PMC_F_LOG_PROCEXIT 0x00000008 /*OP ALLOCATE log proc exits */
304 #define PMC_F_NEWVALUE 0x00000010 /*OP RW write new value */
305 #define PMC_F_OLDVALUE 0x00000020 /*OP RW get old value */
306 #define PMC_F_KGMON 0x00000040 /*OP ALLOCATE kgmon(8) profiling */
308 #define PMC_F_CALLCHAIN 0x00000080 /*OP ALLOCATE capture callchains */
311 #define PMC_F_ATTACHED_TO_OWNER 0x00010000 /*attached to owner*/
312 #define PMC_F_NEEDS_LOGFILE 0x00020000 /*needs log file */
313 #define PMC_F_ATTACH_DONE 0x00040000 /*attached at least once */
315 #define PMC_CALLCHAIN_DEPTH_MAX 32
316 #define PMC_CC_F_USERSPACE 0x01 /*userspace callchain*/
319 * Cookies used to denote allocated PMCs, and the values of PMCs.
322 typedef uint32_t pmc_id_t;
323 typedef uint64_t pmc_value_t;
325 #define PMC_ID_INVALID (~ (pmc_id_t) 0)
328 * PMC IDs have the following format:
330 * +--------+----------+-----------+-----------+
331 * | CPU | PMC MODE | PMC CLASS | ROW INDEX |
332 * +--------+----------+-----------+-----------+
334 * where each field is 8 bits wide. Field 'CPU' is set to the
335 * requested CPU for system-wide PMCs or PMC_CPU_ANY for process-mode
336 * PMCs. Field 'PMC MODE' is the allocated PMC mode. Field 'PMC
337 * CLASS' is the class of the PMC. Field 'ROW INDEX' is the row index
340 * The 'ROW INDEX' ranges over 0..NWPMCS where NHWPMCS is the total
341 * number of hardware PMCs on this cpu.
345 #define PMC_ID_TO_ROWINDEX(ID) ((ID) & 0xFF)
346 #define PMC_ID_TO_CLASS(ID) (((ID) & 0xFF00) >> 8)
347 #define PMC_ID_TO_MODE(ID) (((ID) & 0xFF0000) >> 16)
348 #define PMC_ID_TO_CPU(ID) (((ID) & 0xFF000000) >> 24)
349 #define PMC_ID_MAKE_ID(CPU,MODE,CLASS,ROWINDEX) \
350 ((((CPU) & 0xFF) << 24) | (((MODE) & 0xFF) << 16) | \
351 (((CLASS) & 0xFF) << 8) | ((ROWINDEX) & 0xFF))
354 * Data structures for system calls supported by the pmc driver.
360 * Allocate a PMC on the named CPU.
363 #define PMC_CPU_ANY ~0
365 struct pmc_op_pmcallocate {
366 uint32_t pm_caps; /* PMC_CAP_* */
367 uint32_t pm_cpu; /* CPU number or PMC_CPU_ANY */
368 enum pmc_class pm_class; /* class of PMC desired */
369 enum pmc_event pm_ev; /* [enum pmc_event] desired */
370 uint32_t pm_flags; /* additional modifiers PMC_F_* */
371 enum pmc_mode pm_mode; /* desired mode */
372 pmc_id_t pm_pmcid; /* [return] process pmc id */
374 union pmc_md_op_pmcallocate pm_md; /* MD layer extensions */
380 * Set the administrative state (i.e., whether enabled or disabled) of
381 * a PMC 'pm_pmc' on CPU 'pm_cpu'. Note that 'pm_pmc' specifies an
382 * absolute PMC number and need not have been first allocated by the
386 struct pmc_op_pmcadmin {
387 int pm_cpu; /* CPU# */
388 uint32_t pm_flags; /* flags */
389 int pm_pmc; /* PMC# */
390 enum pmc_state pm_state; /* desired state */
394 * OP PMCATTACH / OP PMCDETACH
396 * Attach/detach a PMC and a process.
399 struct pmc_op_pmcattach {
400 pmc_id_t pm_pmc; /* PMC to attach to */
401 pid_t pm_pid; /* target process */
407 * Set the sampling rate (i.e., the reload count) for statistical counters.
408 * 'pm_pmcid' need to have been previously allocated using PMCALLOCATE.
411 struct pmc_op_pmcsetcount {
412 pmc_value_t pm_count; /* initial/sample count */
413 pmc_id_t pm_pmcid; /* PMC id to set */
420 * Read the value of a PMC named by 'pm_pmcid'. 'pm_pmcid' needs
421 * to have been previously allocated using PMCALLOCATE.
425 struct pmc_op_pmcrw {
426 uint32_t pm_flags; /* PMC_F_{OLD,NEW}VALUE*/
427 pmc_id_t pm_pmcid; /* pmc id */
428 pmc_value_t pm_value; /* new&returned value */
435 * retrieve PMC state for a named CPU. The caller is expected to
436 * allocate 'npmc' * 'struct pmc_info' bytes of space for the return
441 char pm_name[PMC_NAME_MAX]; /* pmc name */
442 enum pmc_class pm_class; /* enum pmc_class */
443 int pm_enabled; /* whether enabled */
444 enum pmc_disp pm_rowdisp; /* FREE, THREAD or STANDLONE */
445 pid_t pm_ownerpid; /* owner, or -1 */
446 enum pmc_mode pm_mode; /* current mode [enum pmc_mode] */
447 enum pmc_event pm_event; /* current event */
448 uint32_t pm_flags; /* current flags */
449 pmc_value_t pm_reloadcount; /* sampling counters only */
452 struct pmc_op_getpmcinfo {
453 int32_t pm_cpu; /* 0 <= cpu < mp_maxid */
454 struct pmc_info pm_pmcs[]; /* space for 'npmc' structures */
461 * Retrieve system CPU information.
464 struct pmc_classinfo {
465 enum pmc_class pm_class; /* class id */
466 uint32_t pm_caps; /* counter capabilities */
467 uint32_t pm_width; /* width of the PMC */
470 struct pmc_op_getcpuinfo {
471 enum pmc_cputype pm_cputype; /* what kind of CPU */
472 uint32_t pm_ncpu; /* number of CPUs */
473 uint32_t pm_npmc; /* #PMCs per CPU */
474 uint32_t pm_nclass; /* #classes of PMCs */
475 struct pmc_classinfo pm_classes[PMC_CLASS_MAX];
481 * Configure a log file for writing system-wide statistics to.
484 struct pmc_op_configurelog {
486 int pm_logfd; /* logfile fd (or -1) */
492 * Retrieve pmc(4) driver-wide statistics.
495 struct pmc_op_getdriverstats {
496 int pm_intr_ignored; /* #interrupts ignored */
497 int pm_intr_processed; /* #interrupts processed */
498 int pm_intr_bufferfull; /* #interrupts with ENOSPC */
499 int pm_syscalls; /* #syscalls */
500 int pm_syscall_errors; /* #syscalls with errors */
501 int pm_buffer_requests; /* #buffer requests */
502 int pm_buffer_requests_failed; /* #failed buffer requests */
503 int pm_log_sweeps; /* #sample buffer processing passes */
507 * OP RELEASE / OP START / OP STOP
509 * Simple operations on a PMC id.
512 struct pmc_op_simple {
519 * Flush the current log buffer and write 4 bytes of user data to it.
522 struct pmc_op_writelog {
523 uint32_t pm_userdata;
529 * Retrieve the machine specific address assoicated with the allocated
530 * PMC. This number can be used subsequently with a read-performance-counter
534 struct pmc_op_getmsr {
535 uint32_t pm_msr; /* machine specific address */
536 pmc_id_t pm_pmcid; /* allocated pmc id */
541 #include <sys/malloc.h>
542 #include <sys/sysctl.h>
544 #include <machine/frame.h>
546 #define PMC_HASH_SIZE 16
547 #define PMC_MTXPOOL_SIZE 32
548 #define PMC_LOG_BUFFER_SIZE 4
549 #define PMC_NLOGBUFFERS 16
550 #define PMC_NSAMPLES 32
551 #define PMC_CALLCHAIN_DEPTH 8
553 #define PMC_SYSCTL_NAME_PREFIX "kern." PMC_MODULE_NAME "."
558 * (b) - pmc_bufferlist_mtx (spin lock)
559 * (k) - pmc_kthread_mtx (sleep lock)
560 * (o) - po->po_mtx (spin lock)
567 struct pmc_syscall_args {
568 uint32_t pmop_code; /* one of PMC_OP_* */
569 void *pmop_data; /* syscall parameter */
573 * Interface to processor specific s1tuff
579 * Machine independent (i.e., the common parts) of a human readable
584 char pd_name[PMC_NAME_MAX]; /* name */
585 uint32_t pd_caps; /* capabilities */
586 enum pmc_class pd_class; /* class of the PMC */
587 uint32_t pd_width; /* width in bits */
593 * This structure records all the target processes associated with a
598 LIST_ENTRY(pmc_target) pt_next;
599 struct pmc_process *pt_process; /* target descriptor */
605 * Describes each allocated PMC.
607 * Each PMC has precisely one owner, namely the process that allocated
610 * A PMC may be attached to multiple target processes. The
611 * 'pm_targets' field links all the target processes being monitored
614 * The 'pm_savedvalue' field is protected by a mutex.
616 * On a multi-cpu machine, multiple target threads associated with a
617 * process-virtual PMC could be concurrently executing on different
618 * CPUs. The 'pm_runcount' field is atomically incremented every time
619 * the PMC gets scheduled on a CPU and atomically decremented when it
620 * get descheduled. Deletion of a PMC is only permitted when this
626 LIST_HEAD(,pmc_target) pm_targets; /* list of target processes */
627 LIST_ENTRY(pmc) pm_next; /* owner's list */
630 * System-wide PMCs are allocated on a CPU and are not moved
631 * around. For system-wide PMCs we record the CPU the PMC was
632 * allocated on in the 'CPU' field of the pmc ID.
634 * Virtual PMCs run on whichever CPU is currently executing
635 * their targets' threads. For these PMCs we need to save
636 * their current PMC counter values when they are taken off
641 pmc_value_t pm_savedvalue; /* Virtual PMCS */
645 * For sampling mode PMCs, we keep track of the PMC's "reload
646 * count", which is the counter value to be loaded in when
647 * arming the PMC for the next counting session. For counting
648 * modes on PMCs that are read-only (e.g., the x86 TSC), we
649 * keep track of the initial value at the start of
650 * counting-mode operation.
654 pmc_value_t pm_reloadcount; /* sampling PMC modes */
655 pmc_value_t pm_initial; /* counting PMC modes */
658 uint32_t pm_stalled; /* marks stalled sampling PMCs */
659 uint32_t pm_caps; /* PMC capabilities */
660 enum pmc_event pm_event; /* event being measured */
661 uint32_t pm_flags; /* additional flags PMC_F_... */
662 struct pmc_owner *pm_owner; /* owner thread state */
663 uint32_t pm_runcount; /* #cpus currently on */
664 enum pmc_state pm_state; /* current PMC state */
667 * The PMC ID field encodes the row-index for the PMC, its
668 * mode, class and the CPU# associated with the PMC.
671 pmc_id_t pm_id; /* allocated PMC id */
674 union pmc_md_pmc pm_md;
678 * Accessor macros for 'struct pmc'
681 #define PMC_TO_MODE(P) PMC_ID_TO_MODE((P)->pm_id)
682 #define PMC_TO_CLASS(P) PMC_ID_TO_CLASS((P)->pm_id)
683 #define PMC_TO_ROWINDEX(P) PMC_ID_TO_ROWINDEX((P)->pm_id)
684 #define PMC_TO_CPU(P) PMC_ID_TO_CPU((P)->pm_id)
690 * Record a 'target' process being profiled.
692 * The target process being profiled could be different from the owner
693 * process which allocated the PMCs. Each target process descriptor
694 * is associated with NHWPMC 'struct pmc *' pointers. Each PMC at a
695 * given hardware row-index 'n' will use slot 'n' of the 'pp_pmcs[]'
696 * array. The size of this structure is thus PMC architecture
699 * TODO: Only process-private counting mode PMCs may be attached to a
700 * process different from the allocator process (since we do not have
701 * the infrastructure to make sense of an interrupted PC value from a
702 * 'target' process (yet)).
706 struct pmc_targetstate {
707 struct pmc *pp_pmc; /* target PMC */
708 pmc_value_t pp_pmcval; /* per-process value */
712 LIST_ENTRY(pmc_process) pp_next; /* hash chain */
713 int pp_refcnt; /* reference count */
714 uint32_t pp_flags; /* flags PMC_PP_* */
715 struct proc *pp_proc; /* target thread */
716 struct pmc_targetstate pp_pmcs[]; /* NHWPMCs */
719 #define PMC_PP_ENABLE_MSR_ACCESS 0x00000001
724 * We associate a PMC with an 'owner' process.
726 * A process can be associated with 0..NCPUS*NHWPMC PMCs during its
727 * lifetime, where NCPUS is the numbers of CPUS in the system and
728 * NHWPMC is the number of hardware PMCs per CPU. These are
729 * maintained in the list headed by the 'po_pmcs' to save on space.
734 LIST_ENTRY(pmc_owner) po_next; /* hash chain */
735 LIST_ENTRY(pmc_owner) po_ssnext; /* list of SS PMC owners */
736 LIST_HEAD(, pmc) po_pmcs; /* owned PMC list */
737 TAILQ_HEAD(, pmclog_buffer) po_logbuffers; /* (o) logbuffer list */
738 struct mtx po_mtx; /* spin lock for (o) */
739 struct proc *po_owner; /* owner proc */
740 uint32_t po_flags; /* (k) flags PMC_PO_* */
741 struct proc *po_kthread; /* (k) helper kthread */
742 struct pmclog_buffer *po_curbuf; /* current log buffer */
743 struct file *po_file; /* file reference */
744 int po_error; /* recorded error */
745 int po_sscount; /* # SS PMCs owned */
748 #define PMC_PO_OWNS_LOGFILE 0x00000001 /* has a log file */
749 #define PMC_PO_IN_FLUSH 0x00000010 /* in the middle of a flush */
750 #define PMC_PO_INITIAL_MAPPINGS_DONE 0x00000020
753 * struct pmc_hw -- describe the state of the PMC hardware
755 * When in use, a HW PMC is associated with one allocated 'struct pmc'
756 * pointed to by field 'phw_pmc'. When inactive, this field is NULL.
758 * On an SMP box, one or more HW PMC's in process virtual mode with
759 * the same 'phw_pmc' could be executing on different CPUs. In order
760 * to handle this case correctly, we need to ensure that only
761 * incremental counts get added to the saved value in the associated
762 * 'struct pmc'. The 'phw_save' field is used to keep the saved PMC
763 * value at the time the hardware is started during this context
764 * switch (i.e., the difference between the new (hardware) count and
765 * the saved count is atomically added to the count field in 'struct
766 * pmc' at context switch time).
771 uint32_t phw_state; /* see PHW_* macros below */
772 struct pmc *phw_pmc; /* current thread PMC */
775 #define PMC_PHW_RI_MASK 0x000000FF
776 #define PMC_PHW_CPU_SHIFT 8
777 #define PMC_PHW_CPU_MASK 0x0000FF00
778 #define PMC_PHW_FLAGS_SHIFT 16
779 #define PMC_PHW_FLAGS_MASK 0xFFFF0000
781 #define PMC_PHW_INDEX_TO_STATE(ri) ((ri) & PMC_PHW_RI_MASK)
782 #define PMC_PHW_STATE_TO_INDEX(state) ((state) & PMC_PHW_RI_MASK)
783 #define PMC_PHW_CPU_TO_STATE(cpu) (((cpu) << PMC_PHW_CPU_SHIFT) & \
785 #define PMC_PHW_STATE_TO_CPU(state) (((state) & PMC_PHW_CPU_MASK) >> \
787 #define PMC_PHW_FLAGS_TO_STATE(flags) (((flags) << PMC_PHW_FLAGS_SHIFT) & \
789 #define PMC_PHW_STATE_TO_FLAGS(state) (((state) & PMC_PHW_FLAGS_MASK) >> \
791 #define PMC_PHW_FLAG_IS_ENABLED (PMC_PHW_FLAGS_TO_STATE(0x01))
792 #define PMC_PHW_FLAG_IS_SHAREABLE (PMC_PHW_FLAGS_TO_STATE(0x02))
797 * Space for N (tunable) PC samples and associated control data.
801 uint16_t ps_nsamples; /* callchain depth */
802 uint8_t ps_cpu; /* cpu number */
803 uint8_t ps_flags; /* other flags */
804 pid_t ps_pid; /* process PID or -1 */
805 struct pmc *ps_pmc; /* interrupting PMC */
806 uintptr_t *ps_pc; /* (const) callchain start */
809 #define PMC_SAMPLE_FREE ((uint16_t) 0)
810 #define PMC_SAMPLE_INUSE ((uint16_t) 0xFFFF)
812 struct pmc_samplebuffer {
813 struct pmc_sample * volatile ps_read; /* read pointer */
814 struct pmc_sample * volatile ps_write; /* write pointer */
815 uintptr_t *ps_callchains; /* all saved call chains */
816 struct pmc_sample *ps_fence; /* one beyond ps_samples[] */
817 struct pmc_sample ps_samples[]; /* array of sample entries */
822 * struct pmc_cpustate
824 * A CPU is modelled as a collection of HW PMCs with space for additional
829 uint32_t pc_state; /* physical cpu number + flags */
830 struct pmc_samplebuffer *pc_sb; /* space for samples */
831 struct pmc_hw *pc_hwpmcs[]; /* 'npmc' pointers */
832 /* other machine dependent fields come here */
835 #define PMC_PCPU_CPU_MASK 0x000000FF
836 #define PMC_PCPU_FLAGS_MASK 0xFFFFFF00
837 #define PMC_PCPU_FLAGS_SHIFT 8
838 #define PMC_PCPU_STATE_TO_CPU(S) ((S) & PMC_PCPU_CPU_MASK)
839 #define PMC_PCPU_STATE_TO_FLAGS(S) (((S) & PMC_PCPU_FLAGS_MASK) >> PMC_PCPU_FLAGS_SHIFT)
840 #define PMC_PCPU_FLAGS_TO_STATE(F) (((F) << PMC_PCPU_FLAGS_SHIFT) & PMC_PCPU_FLAGS_MASK)
841 #define PMC_PCPU_CPU_TO_STATE(C) ((C) & PMC_PCPU_CPU_MASK)
842 #define PMC_PCPU_FLAG_HTT (PMC_PCPU_FLAGS_TO_STATE(0x1))
847 * CPU binding information.
851 int pb_bound; /* is bound? */
852 int pb_cpu; /* if so, to which CPU */
858 * Machine dependent bits needed per CPU type.
862 uint32_t pmd_cputype; /* from enum pmc_cputype */
863 uint32_t pmd_npmc; /* max PMCs per CPU */
864 uint32_t pmd_nclass; /* # PMC classes supported */
865 struct pmc_classinfo pmd_classes[PMC_CLASS_MAX];
866 int pmd_nclasspmcs[PMC_CLASS_MAX];
872 int (*pmd_init)(int _cpu); /* machine dependent initialization */
873 int (*pmd_cleanup)(int _cpu); /* machine dependent cleanup */
875 /* thread context switch in/out */
876 int (*pmd_switch_in)(struct pmc_cpu *_p, struct pmc_process *_pp);
877 int (*pmd_switch_out)(struct pmc_cpu *_p, struct pmc_process *_pp);
879 /* configuring/reading/writing the hardware PMCs */
880 int (*pmd_config_pmc)(int _cpu, int _ri, struct pmc *_pm);
881 int (*pmd_get_config)(int _cpu, int _ri, struct pmc **_ppm);
882 int (*pmd_read_pmc)(int _cpu, int _ri, pmc_value_t *_value);
883 int (*pmd_write_pmc)(int _cpu, int _ri, pmc_value_t _value);
885 /* pmc allocation/release */
886 int (*pmd_allocate_pmc)(int _cpu, int _ri, struct pmc *_t,
887 const struct pmc_op_pmcallocate *_a);
888 int (*pmd_release_pmc)(int _cpu, int _ri, struct pmc *_pm);
890 /* starting and stopping PMCs */
891 int (*pmd_start_pmc)(int _cpu, int _ri);
892 int (*pmd_stop_pmc)(int _cpu, int _ri);
894 /* handle a PMC interrupt */
895 int (*pmd_intr)(int _cpu, struct trapframe *_tf);
897 int (*pmd_describe)(int _cpu, int _ri, struct pmc_info *_pi,
900 int (*pmd_get_msr)(int _ri, uint32_t *_msr);
905 * Per-CPU state. This is an array of 'mp_ncpu' pointers
906 * to struct pmc_cpu descriptors.
909 extern struct pmc_cpu **pmc_pcpu;
910 extern struct pmc_mdep *md;
912 /* driver statistics */
913 extern struct pmc_op_getdriverstats pmc_stats;
915 #if defined(DEBUG) && DEBUG
917 /* debug flags, major flag groups */
918 struct pmc_debugflags {
930 extern struct pmc_debugflags pmc_debugflags;
932 #define PMC_DEBUG_STRSIZE 128
933 #define PMC_DEBUG_DEFAULT_FLAGS { 0, 0, 0, 0, 0, 0, 0, 0 }
935 #define PMCDBG(M,N,L,F,...) do { \
936 if (pmc_debugflags.pdb_ ## M & (1 << PMC_DEBUG_MIN_ ## N)) \
937 printf(#M ":" #N ":" #L ": " F "\n", __VA_ARGS__); \
941 #define PMC_DEBUG_MAJ_CPU 0 /* cpu switches */
942 #define PMC_DEBUG_MAJ_CSW 1 /* context switches */
943 #define PMC_DEBUG_MAJ_LOG 2 /* logging */
944 #define PMC_DEBUG_MAJ_MDP 3 /* machine dependent */
945 #define PMC_DEBUG_MAJ_MOD 4 /* misc module infrastructure */
946 #define PMC_DEBUG_MAJ_OWN 5 /* owner */
947 #define PMC_DEBUG_MAJ_PMC 6 /* pmc management */
948 #define PMC_DEBUG_MAJ_PRC 7 /* processes */
949 #define PMC_DEBUG_MAJ_SAM 8 /* sampling */
953 /* Common (8 bits) */
954 #define PMC_DEBUG_MIN_ALL 0 /* allocation */
955 #define PMC_DEBUG_MIN_REL 1 /* release */
956 #define PMC_DEBUG_MIN_OPS 2 /* ops: start, stop, ... */
957 #define PMC_DEBUG_MIN_INI 3 /* init */
958 #define PMC_DEBUG_MIN_FND 4 /* find */
961 #define PMC_DEBUG_MIN_PMH 14 /* pmc_hook */
962 #define PMC_DEBUG_MIN_PMS 15 /* pmc_syscall */
965 #define PMC_DEBUG_MIN_ORM 8 /* owner remove */
966 #define PMC_DEBUG_MIN_OMR 9 /* owner maybe remove */
969 #define PMC_DEBUG_MIN_TLK 8 /* link target */
970 #define PMC_DEBUG_MIN_TUL 9 /* unlink target */
971 #define PMC_DEBUG_MIN_EXT 10 /* process exit */
972 #define PMC_DEBUG_MIN_EXC 11 /* process exec */
973 #define PMC_DEBUG_MIN_FRK 12 /* process fork */
974 #define PMC_DEBUG_MIN_ATT 13 /* attach/detach */
975 #define PMC_DEBUG_MIN_SIG 14 /* signalling */
977 /* CONTEXT SWITCHES */
978 #define PMC_DEBUG_MIN_SWI 8 /* switch in */
979 #define PMC_DEBUG_MIN_SWO 9 /* switch out */
982 #define PMC_DEBUG_MIN_REG 8 /* pmc register */
983 #define PMC_DEBUG_MIN_ALR 9 /* allocate row */
985 /* MACHINE DEPENDENT LAYER */
986 #define PMC_DEBUG_MIN_REA 8 /* read */
987 #define PMC_DEBUG_MIN_WRI 9 /* write */
988 #define PMC_DEBUG_MIN_CFG 10 /* config */
989 #define PMC_DEBUG_MIN_STA 11 /* start */
990 #define PMC_DEBUG_MIN_STO 12 /* stop */
991 #define PMC_DEBUG_MIN_INT 13 /* interrupts */
994 #define PMC_DEBUG_MIN_BND 8 /* bind */
995 #define PMC_DEBUG_MIN_SEL 9 /* select */
998 #define PMC_DEBUG_MIN_GTB 8 /* get buf */
999 #define PMC_DEBUG_MIN_SIO 9 /* schedule i/o */
1000 #define PMC_DEBUG_MIN_FLS 10 /* flush */
1001 #define PMC_DEBUG_MIN_SAM 11 /* sample */
1004 #define PMCDBG(M,N,L,F,...) /* nothing */
1007 /* declare a dedicated memory pool */
1008 MALLOC_DECLARE(M_PMC);
1014 struct pmc_mdep *pmc_md_initialize(void); /* MD init function */
1015 int pmc_getrowdisp(int _ri);
1016 int pmc_process_interrupt(int _cpu, struct pmc *_pm,
1017 struct trapframe *_tf, int _inuserspace);
1018 int pmc_save_kernel_callchain(uintptr_t *_cc, int _maxsamples,
1019 struct trapframe *_tf);
1020 int pmc_save_user_callchain(uintptr_t *_cc, int _maxsamples,
1021 struct trapframe *_tf);
1022 #endif /* _KERNEL */
1023 #endif /* _SYS_PMC_H_ */