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
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/eventhandler.h>
40 #include <sys/kernel.h>
41 #include <sys/kthread.h>
42 #include <sys/limits.h>
44 #include <sys/malloc.h>
45 #include <sys/module.h>
46 #include <sys/mount.h>
47 #include <sys/mutex.h>
49 #include <sys/pmckern.h>
50 #include <sys/pmclog.h>
53 #include <sys/queue.h>
54 #include <sys/resourcevar.h>
55 #include <sys/rwlock.h>
56 #include <sys/sched.h>
57 #include <sys/signalvar.h>
60 #include <sys/sysctl.h>
61 #include <sys/sysent.h>
62 #include <sys/systm.h>
63 #include <sys/vnode.h>
65 #include <sys/linker.h> /* needs to be after <sys/malloc.h> */
67 #include <machine/atomic.h>
68 #include <machine/md_var.h>
71 #include <vm/vm_extern.h>
73 #include <vm/vm_map.h>
74 #include <vm/vm_object.h>
76 #include "hwpmc_soft.h"
83 PMC_FLAG_NONE = 0x00, /* do nothing */
84 PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */
85 PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */
89 * The offset in sysent where the syscall is allocated.
92 static int pmc_syscall_num = NO_SYSCALL;
93 struct pmc_cpu **pmc_pcpu; /* per-cpu state */
94 pmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */
96 #define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)]
98 struct mtx_pool *pmc_mtxpool;
99 static int *pmc_pmcdisp; /* PMC row dispositions */
101 #define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0)
102 #define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0)
103 #define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0)
105 #define PMC_MARK_ROW_FREE(R) do { \
106 pmc_pmcdisp[(R)] = 0; \
109 #define PMC_MARK_ROW_STANDALONE(R) do { \
110 KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \
112 atomic_add_int(&pmc_pmcdisp[(R)], -1); \
113 KASSERT(pmc_pmcdisp[(R)] >= (-pmc_cpu_max_active()), \
114 ("[pmc,%d] row disposition error", __LINE__)); \
117 #define PMC_UNMARK_ROW_STANDALONE(R) do { \
118 atomic_add_int(&pmc_pmcdisp[(R)], 1); \
119 KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \
123 #define PMC_MARK_ROW_THREAD(R) do { \
124 KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \
126 atomic_add_int(&pmc_pmcdisp[(R)], 1); \
129 #define PMC_UNMARK_ROW_THREAD(R) do { \
130 atomic_add_int(&pmc_pmcdisp[(R)], -1); \
131 KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \
136 /* various event handlers */
137 static eventhandler_tag pmc_exit_tag, pmc_fork_tag, pmc_kld_load_tag,
140 /* Module statistics */
141 struct pmc_op_getdriverstats pmc_stats;
143 /* Machine/processor dependent operations */
144 static struct pmc_mdep *md;
147 * Hash tables mapping owner processes and target threads to PMCs.
150 struct mtx pmc_processhash_mtx; /* spin mutex */
151 static u_long pmc_processhashmask;
152 static LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash;
155 * Hash table of PMC owner descriptors. This table is protected by
156 * the shared PMC "sx" lock.
159 static u_long pmc_ownerhashmask;
160 static LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash;
163 * List of PMC owners with system-wide sampling PMCs.
166 static LIST_HEAD(, pmc_owner) pmc_ss_owners;
170 * A map of row indices to classdep structures.
172 static struct pmc_classdep **pmc_rowindex_to_classdep;
179 static int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS);
180 static int pmc_debugflags_parse(char *newstr, char *fence);
183 static int load(struct module *module, int cmd, void *arg);
184 static int pmc_attach_process(struct proc *p, struct pmc *pm);
185 static struct pmc *pmc_allocate_pmc_descriptor(void);
186 static struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p);
187 static int pmc_attach_one_process(struct proc *p, struct pmc *pm);
188 static int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri,
190 static int pmc_can_attach(struct pmc *pm, struct proc *p);
191 static void pmc_capture_user_callchain(int cpu, int soft, struct trapframe *tf);
192 static void pmc_cleanup(void);
193 static int pmc_detach_process(struct proc *p, struct pmc *pm);
194 static int pmc_detach_one_process(struct proc *p, struct pmc *pm,
196 static void pmc_destroy_owner_descriptor(struct pmc_owner *po);
197 static void pmc_destroy_pmc_descriptor(struct pmc *pm);
198 static struct pmc_owner *pmc_find_owner_descriptor(struct proc *p);
199 static int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm);
200 static struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po,
202 static struct pmc_process *pmc_find_process_descriptor(struct proc *p,
204 static void pmc_force_context_switch(void);
205 static void pmc_link_target_process(struct pmc *pm,
206 struct pmc_process *pp);
207 static void pmc_log_all_process_mappings(struct pmc_owner *po);
208 static void pmc_log_kernel_mappings(struct pmc *pm);
209 static void pmc_log_process_mappings(struct pmc_owner *po, struct proc *p);
210 static void pmc_maybe_remove_owner(struct pmc_owner *po);
211 static void pmc_process_csw_in(struct thread *td);
212 static void pmc_process_csw_out(struct thread *td);
213 static void pmc_process_exit(void *arg, struct proc *p);
214 static void pmc_process_fork(void *arg, struct proc *p1,
215 struct proc *p2, int n);
216 static void pmc_process_samples(int cpu, int soft);
217 static void pmc_release_pmc_descriptor(struct pmc *pmc);
218 static void pmc_remove_owner(struct pmc_owner *po);
219 static void pmc_remove_process_descriptor(struct pmc_process *pp);
220 static void pmc_restore_cpu_binding(struct pmc_binding *pb);
221 static void pmc_save_cpu_binding(struct pmc_binding *pb);
222 static void pmc_select_cpu(int cpu);
223 static int pmc_start(struct pmc *pm);
224 static int pmc_stop(struct pmc *pm);
225 static int pmc_syscall_handler(struct thread *td, void *syscall_args);
226 static void pmc_unlink_target_process(struct pmc *pmc,
227 struct pmc_process *pp);
228 static int generic_switch_in(struct pmc_cpu *pc, struct pmc_process *pp);
229 static int generic_switch_out(struct pmc_cpu *pc, struct pmc_process *pp);
230 static struct pmc_mdep *pmc_generic_cpu_initialize(void);
231 static void pmc_generic_cpu_finalize(struct pmc_mdep *md);
234 * Kernel tunables and sysctl(8) interface.
237 SYSCTL_DECL(_kern_hwpmc);
239 static int pmc_callchaindepth = PMC_CALLCHAIN_DEPTH;
240 SYSCTL_INT(_kern_hwpmc, OID_AUTO, callchaindepth, CTLFLAG_RDTUN,
241 &pmc_callchaindepth, 0, "depth of call chain records");
244 struct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS;
245 char pmc_debugstr[PMC_DEBUG_STRSIZE];
246 TUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr,
247 sizeof(pmc_debugstr));
248 SYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags,
249 CTLTYPE_STRING | CTLFLAG_RWTUN | CTLFLAG_NOFETCH,
250 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags");
254 * kern.hwpmc.hashrows -- determines the number of rows in the
255 * of the hash table used to look up threads
258 static int pmc_hashsize = PMC_HASH_SIZE;
259 SYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_RDTUN,
260 &pmc_hashsize, 0, "rows in hash tables");
263 * kern.hwpmc.nsamples --- number of PC samples/callchain stacks per CPU
266 static int pmc_nsamples = PMC_NSAMPLES;
267 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_RDTUN,
268 &pmc_nsamples, 0, "number of PC samples per CPU");
272 * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool.
275 static int pmc_mtxpool_size = PMC_MTXPOOL_SIZE;
276 SYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_RDTUN,
277 &pmc_mtxpool_size, 0, "size of spin mutex pool");
281 * security.bsd.unprivileged_syspmcs -- allow non-root processes to
282 * allocate system-wide PMCs.
284 * Allowing unprivileged processes to allocate system PMCs is convenient
285 * if system-wide measurements need to be taken concurrently with other
286 * per-process measurements. This feature is turned off by default.
289 static int pmc_unprivileged_syspmcs = 0;
290 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RWTUN,
291 &pmc_unprivileged_syspmcs, 0,
292 "allow unprivileged process to allocate system PMCs");
295 * Hash function. Discard the lower 2 bits of the pointer since
296 * these are always zero for our uses. The hash multiplier is
297 * round((2^LONG_BIT) * ((sqrt(5)-1)/2)).
301 #define _PMC_HM 11400714819323198486u
303 #define _PMC_HM 2654435769u
305 #error Must know the size of 'long' to compile
308 #define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M))
314 /* The `sysent' for the new syscall */
315 static struct sysent pmc_sysent = {
317 .sy_call = pmc_syscall_handler,
320 static struct syscall_module_data pmc_syscall_mod = {
323 .offset = &pmc_syscall_num,
324 .new_sysent = &pmc_sysent,
325 .old_sysent = { .sy_narg = 0, .sy_call = NULL },
326 .flags = SY_THR_STATIC_KLD,
329 static moduledata_t pmc_mod = {
330 .name = PMC_MODULE_NAME,
331 .evhand = syscall_module_handler,
332 .priv = &pmc_syscall_mod,
335 #ifdef EARLY_AP_STARTUP
336 DECLARE_MODULE(pmc, pmc_mod, SI_SUB_SYSCALLS, SI_ORDER_ANY);
338 DECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY);
340 MODULE_VERSION(pmc, PMC_VERSION);
343 enum pmc_dbgparse_state {
344 PMCDS_WS, /* in whitespace */
345 PMCDS_MAJOR, /* seen a major keyword */
350 pmc_debugflags_parse(char *newstr, char *fence)
353 struct pmc_debugflags *tmpflags;
354 int error, found, *newbits, tmp;
357 tmpflags = malloc(sizeof(*tmpflags), M_PMC, M_WAITOK|M_ZERO);
362 for (; p < fence && (c = *p); p++) {
364 /* skip white space */
365 if (c == ' ' || c == '\t')
368 /* look for a keyword followed by "=" */
369 for (q = p; p < fence && (c = *p) && c != '='; p++)
379 /* lookup flag group name */
380 #define DBG_SET_FLAG_MAJ(S,F) \
381 if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \
382 newbits = &tmpflags->pdb_ ## F;
384 DBG_SET_FLAG_MAJ("cpu", CPU);
385 DBG_SET_FLAG_MAJ("csw", CSW);
386 DBG_SET_FLAG_MAJ("logging", LOG);
387 DBG_SET_FLAG_MAJ("module", MOD);
388 DBG_SET_FLAG_MAJ("md", MDP);
389 DBG_SET_FLAG_MAJ("owner", OWN);
390 DBG_SET_FLAG_MAJ("pmc", PMC);
391 DBG_SET_FLAG_MAJ("process", PRC);
392 DBG_SET_FLAG_MAJ("sampling", SAM);
394 if (newbits == NULL) {
399 p++; /* skip the '=' */
401 /* Now parse the individual flags */
404 for (q = p; p < fence && (c = *p); p++)
405 if (c == ' ' || c == '\t' || c == ',')
408 /* p == fence or c == ws or c == "," or c == 0 */
410 if ((kwlen = p - q) == 0) {
416 #define DBG_SET_FLAG_MIN(S,F) \
417 if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \
418 tmp |= found = (1 << PMC_DEBUG_MIN_ ## F)
420 /* a '*' denotes all possible flags in the group */
421 if (kwlen == 1 && *q == '*')
423 /* look for individual flag names */
424 DBG_SET_FLAG_MIN("allocaterow", ALR);
425 DBG_SET_FLAG_MIN("allocate", ALL);
426 DBG_SET_FLAG_MIN("attach", ATT);
427 DBG_SET_FLAG_MIN("bind", BND);
428 DBG_SET_FLAG_MIN("config", CFG);
429 DBG_SET_FLAG_MIN("exec", EXC);
430 DBG_SET_FLAG_MIN("exit", EXT);
431 DBG_SET_FLAG_MIN("find", FND);
432 DBG_SET_FLAG_MIN("flush", FLS);
433 DBG_SET_FLAG_MIN("fork", FRK);
434 DBG_SET_FLAG_MIN("getbuf", GTB);
435 DBG_SET_FLAG_MIN("hook", PMH);
436 DBG_SET_FLAG_MIN("init", INI);
437 DBG_SET_FLAG_MIN("intr", INT);
438 DBG_SET_FLAG_MIN("linktarget", TLK);
439 DBG_SET_FLAG_MIN("mayberemove", OMR);
440 DBG_SET_FLAG_MIN("ops", OPS);
441 DBG_SET_FLAG_MIN("read", REA);
442 DBG_SET_FLAG_MIN("register", REG);
443 DBG_SET_FLAG_MIN("release", REL);
444 DBG_SET_FLAG_MIN("remove", ORM);
445 DBG_SET_FLAG_MIN("sample", SAM);
446 DBG_SET_FLAG_MIN("scheduleio", SIO);
447 DBG_SET_FLAG_MIN("select", SEL);
448 DBG_SET_FLAG_MIN("signal", SIG);
449 DBG_SET_FLAG_MIN("swi", SWI);
450 DBG_SET_FLAG_MIN("swo", SWO);
451 DBG_SET_FLAG_MIN("start", STA);
452 DBG_SET_FLAG_MIN("stop", STO);
453 DBG_SET_FLAG_MIN("syscall", PMS);
454 DBG_SET_FLAG_MIN("unlinktarget", TUL);
455 DBG_SET_FLAG_MIN("write", WRI);
457 /* unrecognized flag name */
462 if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */
471 /* save the new flag set */
472 bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags));
475 free(tmpflags, M_PMC);
480 pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS)
482 char *fence, *newstr;
486 (void) arg1; (void) arg2; /* unused parameters */
488 n = sizeof(pmc_debugstr);
489 newstr = malloc(n, M_PMC, M_WAITOK|M_ZERO);
490 (void) strlcpy(newstr, pmc_debugstr, n);
492 error = sysctl_handle_string(oidp, newstr, n, req);
494 /* if there is a new string, parse and copy it */
495 if (error == 0 && req->newptr != NULL) {
496 fence = newstr + (n < req->newlen ? n : req->newlen + 1);
497 if ((error = pmc_debugflags_parse(newstr, fence)) == 0)
498 (void) strlcpy(pmc_debugstr, newstr,
499 sizeof(pmc_debugstr));
509 * Map a row index to a classdep structure and return the adjusted row
510 * index for the PMC class index.
512 static struct pmc_classdep *
513 pmc_ri_to_classdep(struct pmc_mdep *md, int ri, int *adjri)
515 struct pmc_classdep *pcd;
519 KASSERT(ri >= 0 && ri < md->pmd_npmc,
520 ("[pmc,%d] illegal row-index %d", __LINE__, ri));
522 pcd = pmc_rowindex_to_classdep[ri];
525 ("[pmc,%d] ri %d null pcd", __LINE__, ri));
527 *adjri = ri - pcd->pcd_ri;
529 KASSERT(*adjri >= 0 && *adjri < pcd->pcd_num,
530 ("[pmc,%d] adjusted row-index %d", __LINE__, *adjri));
536 * Concurrency Control
538 * The driver manages the following data structures:
540 * - target process descriptors, one per target process
541 * - owner process descriptors (and attached lists), one per owner process
542 * - lookup hash tables for owner and target processes
543 * - PMC descriptors (and attached lists)
544 * - per-cpu hardware state
545 * - the 'hook' variable through which the kernel calls into
547 * - the machine hardware state (managed by the MD layer)
549 * These data structures are accessed from:
551 * - thread context-switch code
552 * - interrupt handlers (possibly on multiple cpus)
553 * - kernel threads on multiple cpus running on behalf of user
554 * processes doing system calls
555 * - this driver's private kernel threads
557 * = Locks and Locking strategy =
559 * The driver uses four locking strategies for its operation:
561 * - The global SX lock "pmc_sx" is used to protect internal
564 * Calls into the module by syscall() start with this lock being
565 * held in exclusive mode. Depending on the requested operation,
566 * the lock may be downgraded to 'shared' mode to allow more
567 * concurrent readers into the module. Calls into the module from
568 * other parts of the kernel acquire the lock in shared mode.
570 * This SX lock is held in exclusive mode for any operations that
571 * modify the linkages between the driver's internal data structures.
573 * The 'pmc_hook' function pointer is also protected by this lock.
574 * It is only examined with the sx lock held in exclusive mode. The
575 * kernel module is allowed to be unloaded only with the sx lock held
576 * in exclusive mode. In normal syscall handling, after acquiring the
577 * pmc_sx lock we first check that 'pmc_hook' is non-null before
578 * proceeding. This prevents races between the thread unloading the module
579 * and other threads seeking to use the module.
581 * - Lookups of target process structures and owner process structures
582 * cannot use the global "pmc_sx" SX lock because these lookups need
583 * to happen during context switches and in other critical sections
584 * where sleeping is not allowed. We protect these lookup tables
585 * with their own private spin-mutexes, "pmc_processhash_mtx" and
586 * "pmc_ownerhash_mtx".
588 * - Interrupt handlers work in a lock free manner. At interrupt
589 * time, handlers look at the PMC pointer (phw->phw_pmc) configured
590 * when the PMC was started. If this pointer is NULL, the interrupt
591 * is ignored after updating driver statistics. We ensure that this
592 * pointer is set (using an atomic operation if necessary) before the
593 * PMC hardware is started. Conversely, this pointer is unset atomically
594 * only after the PMC hardware is stopped.
596 * We ensure that everything needed for the operation of an
597 * interrupt handler is available without it needing to acquire any
598 * locks. We also ensure that a PMC's software state is destroyed only
599 * after the PMC is taken off hardware (on all CPUs).
601 * - Context-switch handling with process-private PMCs needs more
604 * A given process may be the target of multiple PMCs. For example,
605 * PMCATTACH and PMCDETACH may be requested by a process on one CPU
606 * while the target process is running on another. A PMC could also
607 * be getting released because its owner is exiting. We tackle
608 * these situations in the following manner:
610 * - each target process structure 'pmc_process' has an array
611 * of 'struct pmc *' pointers, one for each hardware PMC.
613 * - At context switch IN time, each "target" PMC in RUNNING state
614 * gets started on hardware and a pointer to each PMC is copied into
615 * the per-cpu phw array. The 'runcount' for the PMC is
618 * - At context switch OUT time, all process-virtual PMCs are stopped
619 * on hardware. The saved value is added to the PMCs value field
620 * only if the PMC is in a non-deleted state (the PMCs state could
621 * have changed during the current time slice).
623 * Note that since in-between a switch IN on a processor and a switch
624 * OUT, the PMC could have been released on another CPU. Therefore
625 * context switch OUT always looks at the hardware state to turn
626 * OFF PMCs and will update a PMC's saved value only if reachable
627 * from the target process record.
629 * - OP PMCRELEASE could be called on a PMC at any time (the PMC could
630 * be attached to many processes at the time of the call and could
631 * be active on multiple CPUs).
633 * We prevent further scheduling of the PMC by marking it as in
634 * state 'DELETED'. If the runcount of the PMC is non-zero then
635 * this PMC is currently running on a CPU somewhere. The thread
636 * doing the PMCRELEASE operation waits by repeatedly doing a
637 * pause() till the runcount comes to zero.
639 * The contents of a PMC descriptor (struct pmc) are protected using
640 * a spin-mutex. In order to save space, we use a mutex pool.
642 * In terms of lock types used by witness(4), we use:
643 * - Type "pmc-sx", used by the global SX lock.
644 * - Type "pmc-sleep", for sleep mutexes used by logger threads.
645 * - Type "pmc-per-proc", for protecting PMC owner descriptors.
646 * - Type "pmc-leaf", used for all other spin mutexes.
650 * save the cpu binding of the current kthread
654 pmc_save_cpu_binding(struct pmc_binding *pb)
656 PMCDBG0(CPU,BND,2, "save-cpu");
657 thread_lock(curthread);
658 pb->pb_bound = sched_is_bound(curthread);
659 pb->pb_cpu = curthread->td_oncpu;
660 thread_unlock(curthread);
661 PMCDBG1(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu);
665 * restore the cpu binding of the current thread
669 pmc_restore_cpu_binding(struct pmc_binding *pb)
671 PMCDBG2(CPU,BND,2, "restore-cpu curcpu=%d restore=%d",
672 curthread->td_oncpu, pb->pb_cpu);
673 thread_lock(curthread);
675 sched_bind(curthread, pb->pb_cpu);
677 sched_unbind(curthread);
678 thread_unlock(curthread);
679 PMCDBG0(CPU,BND,2, "restore-cpu done");
683 * move execution over the specified cpu and bind it there.
687 pmc_select_cpu(int cpu)
689 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
690 ("[pmc,%d] bad cpu number %d", __LINE__, cpu));
692 /* Never move to an inactive CPU. */
693 KASSERT(pmc_cpu_is_active(cpu), ("[pmc,%d] selecting inactive "
694 "CPU %d", __LINE__, cpu));
696 PMCDBG1(CPU,SEL,2, "select-cpu cpu=%d", cpu);
697 thread_lock(curthread);
698 sched_bind(curthread, cpu);
699 thread_unlock(curthread);
701 KASSERT(curthread->td_oncpu == cpu,
702 ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__,
703 cpu, curthread->td_oncpu));
705 PMCDBG1(CPU,SEL,2, "select-cpu cpu=%d ok", cpu);
709 * Force a context switch.
711 * We do this by pause'ing for 1 tick -- invoking mi_switch() is not
712 * guaranteed to force a context switch.
716 pmc_force_context_switch(void)
723 * Get the file name for an executable. This is a simple wrapper
724 * around vn_fullpath(9).
728 pmc_getfilename(struct vnode *v, char **fullpath, char **freepath)
731 *fullpath = "unknown";
733 vn_fullpath(curthread, v, fullpath, freepath);
737 * remove an process owning PMCs
741 pmc_remove_owner(struct pmc_owner *po)
743 struct pmc *pm, *tmp;
745 sx_assert(&pmc_sx, SX_XLOCKED);
747 PMCDBG1(OWN,ORM,1, "remove-owner po=%p", po);
749 /* Remove descriptor from the owner hash table */
750 LIST_REMOVE(po, po_next);
752 /* release all owned PMC descriptors */
753 LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) {
754 PMCDBG1(OWN,ORM,2, "pmc=%p", pm);
755 KASSERT(pm->pm_owner == po,
756 ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po));
758 pmc_release_pmc_descriptor(pm); /* will unlink from the list */
759 pmc_destroy_pmc_descriptor(pm);
762 KASSERT(po->po_sscount == 0,
763 ("[pmc,%d] SS count not zero", __LINE__));
764 KASSERT(LIST_EMPTY(&po->po_pmcs),
765 ("[pmc,%d] PMC list not empty", __LINE__));
767 /* de-configure the log file if present */
768 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
769 pmclog_deconfigure_log(po);
773 * remove an owner process record if all conditions are met.
777 pmc_maybe_remove_owner(struct pmc_owner *po)
780 PMCDBG1(OWN,OMR,1, "maybe-remove-owner po=%p", po);
783 * Remove owner record if
784 * - this process does not own any PMCs
785 * - this process has not allocated a system-wide sampling buffer
788 if (LIST_EMPTY(&po->po_pmcs) &&
789 ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) {
790 pmc_remove_owner(po);
791 pmc_destroy_owner_descriptor(po);
796 * Add an association between a target process and a PMC.
800 pmc_link_target_process(struct pmc *pm, struct pmc_process *pp)
803 struct pmc_target *pt;
805 sx_assert(&pmc_sx, SX_XLOCKED);
807 KASSERT(pm != NULL && pp != NULL,
808 ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp));
809 KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)),
810 ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d",
811 __LINE__, pm, pp->pp_proc->p_pid));
812 KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= ((int) md->pmd_npmc - 1),
813 ("[pmc,%d] Illegal reference count %d for process record %p",
814 __LINE__, pp->pp_refcnt, (void *) pp));
816 ri = PMC_TO_ROWINDEX(pm);
818 PMCDBG3(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p",
822 LIST_FOREACH(pt, &pm->pm_targets, pt_next)
823 if (pt->pt_process == pp)
824 KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets",
828 pt = malloc(sizeof(struct pmc_target), M_PMC, M_WAITOK|M_ZERO);
831 LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next);
833 atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc,
836 if (pm->pm_owner->po_owner == pp->pp_proc)
837 pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER;
840 * Initialize the per-process values at this row index.
842 pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ?
843 pm->pm_sc.pm_reloadcount : 0;
850 * Removes the association between a target process and a PMC.
854 pmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp)
858 struct pmc_target *ptgt;
860 sx_assert(&pmc_sx, SX_XLOCKED);
862 KASSERT(pm != NULL && pp != NULL,
863 ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp));
865 KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt <= (int) md->pmd_npmc,
866 ("[pmc,%d] Illegal ref count %d on process record %p",
867 __LINE__, pp->pp_refcnt, (void *) pp));
869 ri = PMC_TO_ROWINDEX(pm);
871 PMCDBG3(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p",
874 KASSERT(pp->pp_pmcs[ri].pp_pmc == pm,
875 ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__,
876 ri, pm, pp->pp_pmcs[ri].pp_pmc));
878 pp->pp_pmcs[ri].pp_pmc = NULL;
879 pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0;
881 /* Remove owner-specific flags */
882 if (pm->pm_owner->po_owner == pp->pp_proc) {
883 pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS;
884 pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER;
889 /* Remove the target process from the PMC structure */
890 LIST_FOREACH(ptgt, &pm->pm_targets, pt_next)
891 if (ptgt->pt_process == pp)
894 KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found "
895 "in pmc %p", __LINE__, pp->pp_proc, pp, pm));
897 LIST_REMOVE(ptgt, pt_next);
900 /* if the PMC now lacks targets, send the owner a SIGIO */
901 if (LIST_EMPTY(&pm->pm_targets)) {
902 p = pm->pm_owner->po_owner;
904 kern_psignal(p, SIGIO);
907 PMCDBG2(PRC,SIG,2, "signalling proc=%p signal=%d", p,
913 * Check if PMC 'pm' may be attached to target process 't'.
917 pmc_can_attach(struct pmc *pm, struct proc *t)
919 struct proc *o; /* pmc owner */
920 struct ucred *oc, *tc; /* owner, target credentials */
921 int decline_attach, i;
924 * A PMC's owner can always attach that PMC to itself.
927 if ((o = pm->pm_owner->po_owner) == t)
941 * The effective uid of the PMC owner should match at least one
942 * of the {effective,real,saved} uids of the target process.
945 decline_attach = oc->cr_uid != tc->cr_uid &&
946 oc->cr_uid != tc->cr_svuid &&
947 oc->cr_uid != tc->cr_ruid;
950 * Every one of the target's group ids, must be in the owner's
953 for (i = 0; !decline_attach && i < tc->cr_ngroups; i++)
954 decline_attach = !groupmember(tc->cr_groups[i], oc);
956 /* check the read and saved gids too */
957 if (decline_attach == 0)
958 decline_attach = !groupmember(tc->cr_rgid, oc) ||
959 !groupmember(tc->cr_svgid, oc);
964 return !decline_attach;
968 * Attach a process to a PMC.
972 pmc_attach_one_process(struct proc *p, struct pmc *pm)
975 char *fullpath, *freepath;
976 struct pmc_process *pp;
978 sx_assert(&pmc_sx, SX_XLOCKED);
980 PMCDBG5(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm,
981 PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm);
984 * Locate the process descriptor corresponding to process 'p',
985 * allocating space as needed.
987 * Verify that rowindex 'pm_rowindex' is free in the process
990 * If not, allocate space for a descriptor and link the
991 * process descriptor and PMC.
993 ri = PMC_TO_ROWINDEX(pm);
995 if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL)
998 if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */
1001 if (pp->pp_pmcs[ri].pp_pmc != NULL)
1004 pmc_link_target_process(pm, pp);
1006 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) &&
1007 (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0)
1008 pm->pm_flags |= PMC_F_NEEDS_LOGFILE;
1010 pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */
1012 /* issue an attach event to a configured log file */
1013 if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) {
1014 if (p->p_flag & P_KPROC) {
1015 fullpath = kernelname;
1018 pmc_getfilename(p->p_textvp, &fullpath, &freepath);
1019 pmclog_process_pmcattach(pm, p->p_pid, fullpath);
1021 free(freepath, M_TEMP);
1022 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
1023 pmc_log_process_mappings(pm->pm_owner, p);
1025 /* mark process as using HWPMCs */
1027 p->p_flag |= P_HWPMC;
1034 * Attach a process and optionally its children
1038 pmc_attach_process(struct proc *p, struct pmc *pm)
1043 sx_assert(&pmc_sx, SX_XLOCKED);
1045 PMCDBG5(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm,
1046 PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm);
1050 * If this PMC successfully allowed a GETMSR operation
1051 * in the past, disallow further ATTACHes.
1054 if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0)
1057 if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0)
1058 return pmc_attach_one_process(p, pm);
1061 * Traverse all child processes, attaching them to
1065 sx_slock(&proctree_lock);
1070 if ((error = pmc_attach_one_process(p, pm)) != 0)
1072 if (!LIST_EMPTY(&p->p_children))
1073 p = LIST_FIRST(&p->p_children);
1077 if (LIST_NEXT(p, p_sibling)) {
1078 p = LIST_NEXT(p, p_sibling);
1086 (void) pmc_detach_process(top, pm);
1089 sx_sunlock(&proctree_lock);
1094 * Detach a process from a PMC. If there are no other PMCs tracking
1095 * this process, remove the process structure from its hash table. If
1096 * 'flags' contains PMC_FLAG_REMOVE, then free the process structure.
1100 pmc_detach_one_process(struct proc *p, struct pmc *pm, int flags)
1103 struct pmc_process *pp;
1105 sx_assert(&pmc_sx, SX_XLOCKED);
1108 ("[pmc,%d] null pm pointer", __LINE__));
1110 ri = PMC_TO_ROWINDEX(pm);
1112 PMCDBG6(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x",
1113 pm, ri, p, p->p_pid, p->p_comm, flags);
1115 if ((pp = pmc_find_process_descriptor(p, 0)) == NULL)
1118 if (pp->pp_pmcs[ri].pp_pmc != pm)
1121 pmc_unlink_target_process(pm, pp);
1123 /* Issue a detach entry if a log file is configured */
1124 if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE)
1125 pmclog_process_pmcdetach(pm, p->p_pid);
1128 * If there are no PMCs targeting this process, we remove its
1129 * descriptor from the target hash table and unset the P_HWPMC
1130 * flag in the struct proc.
1132 KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc,
1133 ("[pmc,%d] Illegal refcnt %d for process struct %p",
1134 __LINE__, pp->pp_refcnt, pp));
1136 if (pp->pp_refcnt != 0) /* still a target of some PMC */
1139 pmc_remove_process_descriptor(pp);
1141 if (flags & PMC_FLAG_REMOVE)
1145 p->p_flag &= ~P_HWPMC;
1152 * Detach a process and optionally its descendants from a PMC.
1156 pmc_detach_process(struct proc *p, struct pmc *pm)
1160 sx_assert(&pmc_sx, SX_XLOCKED);
1162 PMCDBG5(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm,
1163 PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm);
1165 if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0)
1166 return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE);
1169 * Traverse all children, detaching them from this PMC. We
1170 * ignore errors since we could be detaching a PMC from a
1171 * partially attached proc tree.
1174 sx_slock(&proctree_lock);
1179 (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE);
1181 if (!LIST_EMPTY(&p->p_children))
1182 p = LIST_FIRST(&p->p_children);
1186 if (LIST_NEXT(p, p_sibling)) {
1187 p = LIST_NEXT(p, p_sibling);
1195 sx_sunlock(&proctree_lock);
1197 if (LIST_EMPTY(&pm->pm_targets))
1198 pm->pm_flags &= ~PMC_F_ATTACH_DONE;
1205 * Thread context switch IN
1209 pmc_process_csw_in(struct thread *td)
1212 unsigned int adjri, ri;
1217 pmc_value_t newvalue;
1218 struct pmc_process *pp;
1219 struct pmc_classdep *pcd;
1223 if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL)
1226 KASSERT(pp->pp_proc == td->td_proc,
1227 ("[pmc,%d] not my thread state", __LINE__));
1229 critical_enter(); /* no preemption from this point */
1231 cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */
1233 PMCDBG5(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p,
1234 p->p_pid, p->p_comm, pp);
1236 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1237 ("[pmc,%d] weird CPU id %d", __LINE__, cpu));
1241 for (ri = 0; ri < md->pmd_npmc; ri++) {
1243 if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL)
1246 KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)),
1247 ("[pmc,%d] Target PMC in non-virtual mode (%d)",
1248 __LINE__, PMC_TO_MODE(pm)));
1250 KASSERT(PMC_TO_ROWINDEX(pm) == ri,
1251 ("[pmc,%d] Row index mismatch pmc %d != ri %d",
1252 __LINE__, PMC_TO_ROWINDEX(pm), ri));
1255 * Only PMCs that are marked as 'RUNNING' need
1256 * be placed on hardware.
1259 if (pm->pm_state != PMC_STATE_RUNNING)
1262 /* increment PMC runcount */
1263 atomic_add_rel_int(&pm->pm_runcount, 1);
1265 /* configure the HWPMC we are going to use. */
1266 pcd = pmc_ri_to_classdep(md, ri, &adjri);
1267 pcd->pcd_config_pmc(cpu, adjri, pm);
1269 phw = pc->pc_hwpmcs[ri];
1271 KASSERT(phw != NULL,
1272 ("[pmc,%d] null hw pointer", __LINE__));
1274 KASSERT(phw->phw_pmc == pm,
1275 ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__,
1279 * Write out saved value and start the PMC.
1281 * Sampling PMCs use a per-process value, while
1282 * counting mode PMCs use a per-pmc value that is
1283 * inherited across descendants.
1285 if (PMC_TO_MODE(pm) == PMC_MODE_TS) {
1286 mtx_pool_lock_spin(pmc_mtxpool, pm);
1289 * Use the saved value calculated after the most recent
1290 * thread switch out to start this counter. Reset
1291 * the saved count in case another thread from this
1292 * process switches in before any threads switch out.
1294 newvalue = PMC_PCPU_SAVED(cpu,ri) =
1295 pp->pp_pmcs[ri].pp_pmcval;
1296 pp->pp_pmcs[ri].pp_pmcval = pm->pm_sc.pm_reloadcount;
1297 mtx_pool_unlock_spin(pmc_mtxpool, pm);
1299 KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC,
1300 ("[pmc,%d] illegal mode=%d", __LINE__,
1302 mtx_pool_lock_spin(pmc_mtxpool, pm);
1303 newvalue = PMC_PCPU_SAVED(cpu, ri) =
1304 pm->pm_gv.pm_savedvalue;
1305 mtx_pool_unlock_spin(pmc_mtxpool, pm);
1308 PMCDBG3(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue);
1310 pcd->pcd_write_pmc(cpu, adjri, newvalue);
1312 /* If a sampling mode PMC, reset stalled state. */
1313 if (PMC_TO_MODE(pm) == PMC_MODE_TS)
1314 CPU_CLR_ATOMIC(cpu, &pm->pm_stalled);
1316 /* Indicate that we desire this to run. */
1317 CPU_SET_ATOMIC(cpu, &pm->pm_cpustate);
1319 /* Start the PMC. */
1320 pcd->pcd_start_pmc(cpu, adjri);
1324 * perform any other architecture/cpu dependent thread
1325 * switch-in actions.
1328 (void) (*md->pmd_switch_in)(pc, pp);
1335 * Thread context switch OUT.
1339 pmc_process_csw_out(struct thread *td)
1347 pmc_value_t newvalue;
1348 unsigned int adjri, ri;
1349 struct pmc_process *pp;
1350 struct pmc_classdep *pcd;
1354 * Locate our process descriptor; this may be NULL if
1355 * this process is exiting and we have already removed
1356 * the process from the target process table.
1358 * Note that due to kernel preemption, multiple
1359 * context switches may happen while the process is
1362 * Note also that if the target process cannot be
1363 * found we still need to deconfigure any PMCs that
1364 * are currently running on hardware.
1368 pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE);
1376 cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */
1378 PMCDBG5(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p,
1379 p->p_pid, p->p_comm, pp);
1381 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1382 ("[pmc,%d weird CPU id %d", __LINE__, cpu));
1387 * When a PMC gets unlinked from a target PMC, it will
1388 * be removed from the target's pp_pmc[] array.
1390 * However, on a MP system, the target could have been
1391 * executing on another CPU at the time of the unlink.
1392 * So, at context switch OUT time, we need to look at
1393 * the hardware to determine if a PMC is scheduled on
1397 for (ri = 0; ri < md->pmd_npmc; ri++) {
1399 pcd = pmc_ri_to_classdep(md, ri, &adjri);
1401 (void) (*pcd->pcd_get_config)(cpu, adjri, &pm);
1403 if (pm == NULL) /* nothing at this row index */
1406 mode = PMC_TO_MODE(pm);
1407 if (!PMC_IS_VIRTUAL_MODE(mode))
1408 continue; /* not a process virtual PMC */
1410 KASSERT(PMC_TO_ROWINDEX(pm) == ri,
1411 ("[pmc,%d] ri mismatch pmc(%d) ri(%d)",
1412 __LINE__, PMC_TO_ROWINDEX(pm), ri));
1415 * Change desired state, and then stop if not stalled.
1416 * This two-step dance should avoid race conditions where
1417 * an interrupt re-enables the PMC after this code has
1418 * already checked the pm_stalled flag.
1420 CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate);
1421 if (!CPU_ISSET(cpu, &pm->pm_stalled))
1422 pcd->pcd_stop_pmc(cpu, adjri);
1424 /* reduce this PMC's runcount */
1425 atomic_subtract_rel_int(&pm->pm_runcount, 1);
1428 * If this PMC is associated with this process,
1432 if (pm->pm_state != PMC_STATE_DELETED && pp != NULL &&
1433 pp->pp_pmcs[ri].pp_pmc != NULL) {
1434 KASSERT(pm == pp->pp_pmcs[ri].pp_pmc,
1435 ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__,
1436 pm, ri, pp->pp_pmcs[ri].pp_pmc));
1438 KASSERT(pp->pp_refcnt > 0,
1439 ("[pmc,%d] pp refcnt = %d", __LINE__,
1442 pcd->pcd_read_pmc(cpu, adjri, &newvalue);
1444 if (mode == PMC_MODE_TS) {
1445 PMCDBG3(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd (samp)",
1446 cpu, ri, PMC_PCPU_SAVED(cpu,ri) - newvalue);
1449 * For sampling process-virtual PMCs,
1450 * newvalue is the number of events to be seen
1451 * until the next sampling interrupt.
1452 * We can just add the events left from this
1453 * invocation to the counter, then adjust
1454 * in case we overflow our range.
1456 * (Recall that we reload the counter every
1459 mtx_pool_lock_spin(pmc_mtxpool, pm);
1461 pp->pp_pmcs[ri].pp_pmcval += newvalue;
1462 if (pp->pp_pmcs[ri].pp_pmcval >
1463 pm->pm_sc.pm_reloadcount)
1464 pp->pp_pmcs[ri].pp_pmcval -=
1465 pm->pm_sc.pm_reloadcount;
1466 KASSERT(pp->pp_pmcs[ri].pp_pmcval > 0 &&
1467 pp->pp_pmcs[ri].pp_pmcval <=
1468 pm->pm_sc.pm_reloadcount,
1469 ("[pmc,%d] pp_pmcval outside of expected "
1470 "range cpu=%d ri=%d pp_pmcval=%jx "
1471 "pm_reloadcount=%jx", __LINE__, cpu, ri,
1472 pp->pp_pmcs[ri].pp_pmcval,
1473 pm->pm_sc.pm_reloadcount));
1474 mtx_pool_unlock_spin(pmc_mtxpool, pm);
1477 tmp = newvalue - PMC_PCPU_SAVED(cpu,ri);
1479 PMCDBG3(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd (count)",
1483 * For counting process-virtual PMCs,
1484 * we expect the count to be
1485 * increasing monotonically, modulo a 64
1489 ("[pmc,%d] negative increment cpu=%d "
1490 "ri=%d newvalue=%jx saved=%jx "
1491 "incr=%jx", __LINE__, cpu, ri,
1492 newvalue, PMC_PCPU_SAVED(cpu,ri), tmp));
1494 mtx_pool_lock_spin(pmc_mtxpool, pm);
1495 pm->pm_gv.pm_savedvalue += tmp;
1496 pp->pp_pmcs[ri].pp_pmcval += tmp;
1497 mtx_pool_unlock_spin(pmc_mtxpool, pm);
1499 if (pm->pm_flags & PMC_F_LOG_PROCCSW)
1500 pmclog_process_proccsw(pm, pp, tmp);
1504 /* mark hardware as free */
1505 pcd->pcd_config_pmc(cpu, adjri, NULL);
1509 * perform any other architecture/cpu dependent thread
1510 * switch out functions.
1513 (void) (*md->pmd_switch_out)(pc, pp);
1519 * A mapping change for a process.
1523 pmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm)
1527 char *fullpath, *freepath;
1528 const struct pmc *pm;
1529 struct pmc_owner *po;
1530 const struct pmc_process *pp;
1532 freepath = fullpath = NULL;
1533 pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath);
1535 pid = td->td_proc->p_pid;
1537 /* Inform owners of all system-wide sampling PMCs. */
1538 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
1539 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
1540 pmclog_process_map_in(po, pid, pkm->pm_address, fullpath);
1542 if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL)
1546 * Inform sampling PMC owners tracking this process.
1548 for (ri = 0; ri < md->pmd_npmc; ri++)
1549 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL &&
1550 PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
1551 pmclog_process_map_in(pm->pm_owner,
1552 pid, pkm->pm_address, fullpath);
1556 free(freepath, M_TEMP);
1561 * Log an munmap request.
1565 pmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm)
1569 struct pmc_owner *po;
1570 const struct pmc *pm;
1571 const struct pmc_process *pp;
1573 pid = td->td_proc->p_pid;
1575 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
1576 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
1577 pmclog_process_map_out(po, pid, pkm->pm_address,
1578 pkm->pm_address + pkm->pm_size);
1580 if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL)
1583 for (ri = 0; ri < md->pmd_npmc; ri++)
1584 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL &&
1585 PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
1586 pmclog_process_map_out(pm->pm_owner, pid,
1587 pkm->pm_address, pkm->pm_address + pkm->pm_size);
1591 * Log mapping information about the kernel.
1595 pmc_log_kernel_mappings(struct pmc *pm)
1597 struct pmc_owner *po;
1598 struct pmckern_map_in *km, *kmbase;
1600 sx_assert(&pmc_sx, SX_LOCKED);
1601 KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)),
1602 ("[pmc,%d] non-sampling PMC (%p) desires mapping information",
1603 __LINE__, (void *) pm));
1607 if (po->po_flags & PMC_PO_INITIAL_MAPPINGS_DONE)
1611 * Log the current set of kernel modules.
1613 kmbase = linker_hwpmc_list_objects();
1614 for (km = kmbase; km->pm_file != NULL; km++) {
1615 PMCDBG2(LOG,REG,1,"%s %p", (char *) km->pm_file,
1616 (void *) km->pm_address);
1617 pmclog_process_map_in(po, (pid_t) -1, km->pm_address,
1620 free(kmbase, M_LINKER);
1622 po->po_flags |= PMC_PO_INITIAL_MAPPINGS_DONE;
1626 * Log the mappings for a single process.
1630 pmc_log_process_mappings(struct pmc_owner *po, struct proc *p)
1635 vm_map_entry_t entry;
1636 vm_offset_t last_end;
1637 u_int last_timestamp;
1638 struct vnode *last_vp;
1639 vm_offset_t start_addr;
1640 vm_object_t obj, lobj, tobj;
1641 char *fullpath, *freepath;
1644 last_end = (vm_offset_t) 0;
1645 fullpath = freepath = NULL;
1647 if ((vm = vmspace_acquire_ref(p)) == NULL)
1651 vm_map_lock_read(map);
1653 for (entry = map->header.next; entry != &map->header; entry = entry->next) {
1655 if (entry == NULL) {
1656 PMCDBG2(LOG,OPS,2, "hwpmc: vm_map entry unexpectedly "
1657 "NULL! pid=%d vm_map=%p\n", p->p_pid, map);
1662 * We only care about executable map entries.
1664 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
1665 !(entry->protection & VM_PROT_EXECUTE) ||
1666 (entry->object.vm_object == NULL)) {
1670 obj = entry->object.vm_object;
1671 VM_OBJECT_RLOCK(obj);
1674 * Walk the backing_object list to find the base
1675 * (non-shadowed) vm_object.
1677 for (lobj = tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
1679 VM_OBJECT_RLOCK(tobj);
1681 VM_OBJECT_RUNLOCK(lobj);
1686 * At this point lobj is the base vm_object and it is locked.
1689 PMCDBG3(LOG,OPS,2, "hwpmc: lobj unexpectedly NULL! pid=%d "
1690 "vm_map=%p vm_obj=%p\n", p->p_pid, map, obj);
1691 VM_OBJECT_RUNLOCK(obj);
1695 vp = vm_object_vnode(lobj);
1698 VM_OBJECT_RUNLOCK(lobj);
1699 VM_OBJECT_RUNLOCK(obj);
1704 * Skip contiguous regions that point to the same
1705 * vnode, so we don't emit redundant MAP-IN
1708 if (entry->start == last_end && vp == last_vp) {
1709 last_end = entry->end;
1711 VM_OBJECT_RUNLOCK(lobj);
1712 VM_OBJECT_RUNLOCK(obj);
1717 * We don't want to keep the proc's vm_map or this
1718 * vm_object locked while we walk the pathname, since
1719 * vn_fullpath() can sleep. However, if we drop the
1720 * lock, it's possible for concurrent activity to
1721 * modify the vm_map list. To protect against this,
1722 * we save the vm_map timestamp before we release the
1723 * lock, and check it after we reacquire the lock
1726 start_addr = entry->start;
1727 last_end = entry->end;
1728 last_timestamp = map->timestamp;
1729 vm_map_unlock_read(map);
1733 VM_OBJECT_RUNLOCK(lobj);
1735 VM_OBJECT_RUNLOCK(obj);
1738 pmc_getfilename(vp, &fullpath, &freepath);
1744 pmclog_process_map_in(po, p->p_pid, start_addr, fullpath);
1746 free(freepath, M_TEMP);
1748 vm_map_lock_read(map);
1751 * If our saved timestamp doesn't match, this means
1752 * that the vm_map was modified out from under us and
1753 * we can't trust our current "entry" pointer. Do a
1754 * new lookup for this entry. If there is no entry
1755 * for this address range, vm_map_lookup_entry() will
1756 * return the previous one, so we always want to go to
1757 * entry->next on the next loop iteration.
1759 * There is an edge condition here that can occur if
1760 * there is no entry at or before this address. In
1761 * this situation, vm_map_lookup_entry returns
1762 * &map->header, which would cause our loop to abort
1763 * without processing the rest of the map. However,
1764 * in practice this will never happen for process
1765 * vm_map. This is because the executable's text
1766 * segment is the first mapping in the proc's address
1767 * space, and this mapping is never removed until the
1768 * process exits, so there will always be a non-header
1769 * entry at or before the requested address for
1770 * vm_map_lookup_entry to return.
1772 if (map->timestamp != last_timestamp)
1773 vm_map_lookup_entry(map, last_end - 1, &entry);
1776 vm_map_unlock_read(map);
1782 * Log mappings for all processes in the system.
1786 pmc_log_all_process_mappings(struct pmc_owner *po)
1788 struct proc *p, *top;
1790 sx_assert(&pmc_sx, SX_XLOCKED);
1792 if ((p = pfind(1)) == NULL)
1793 panic("[pmc,%d] Cannot find init", __LINE__);
1797 sx_slock(&proctree_lock);
1802 pmc_log_process_mappings(po, p);
1803 if (!LIST_EMPTY(&p->p_children))
1804 p = LIST_FIRST(&p->p_children);
1808 if (LIST_NEXT(p, p_sibling)) {
1809 p = LIST_NEXT(p, p_sibling);
1816 sx_sunlock(&proctree_lock);
1820 * The 'hook' invoked from the kernel proper
1825 const char *pmc_hooknames[] = {
1826 /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */
1843 pmc_hook_handler(struct thread *td, int function, void *arg)
1846 PMCDBG4(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function,
1847 pmc_hooknames[function], arg);
1856 case PMC_FN_PROCESS_EXEC:
1858 char *fullpath, *freepath;
1860 int is_using_hwpmcs;
1863 struct pmc_owner *po;
1864 struct pmc_process *pp;
1865 struct pmckern_procexec *pk;
1867 sx_assert(&pmc_sx, SX_XLOCKED);
1870 pmc_getfilename(p->p_textvp, &fullpath, &freepath);
1872 pk = (struct pmckern_procexec *) arg;
1874 /* Inform owners of SS mode PMCs of the exec event. */
1875 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
1876 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
1877 pmclog_process_procexec(po, PMC_ID_INVALID,
1878 p->p_pid, pk->pm_entryaddr, fullpath);
1881 is_using_hwpmcs = p->p_flag & P_HWPMC;
1884 if (!is_using_hwpmcs) {
1886 free(freepath, M_TEMP);
1891 * PMCs are not inherited across an exec(): remove any
1892 * PMCs that this process is the owner of.
1895 if ((po = pmc_find_owner_descriptor(p)) != NULL) {
1896 pmc_remove_owner(po);
1897 pmc_destroy_owner_descriptor(po);
1901 * If the process being exec'ed is not the target of any
1904 if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) {
1906 free(freepath, M_TEMP);
1911 * Log the exec event to all monitoring owners. Skip
1912 * owners who have already received the event because
1913 * they had system sampling PMCs active.
1915 for (ri = 0; ri < md->pmd_npmc; ri++)
1916 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) {
1918 if (po->po_sscount == 0 &&
1919 po->po_flags & PMC_PO_OWNS_LOGFILE)
1920 pmclog_process_procexec(po, pm->pm_id,
1921 p->p_pid, pk->pm_entryaddr,
1926 free(freepath, M_TEMP);
1929 PMCDBG4(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d",
1930 p, p->p_pid, p->p_comm, pk->pm_credentialschanged);
1932 if (pk->pm_credentialschanged == 0) /* no change */
1936 * If the newly exec()'ed process has a different credential
1937 * than before, allow it to be the target of a PMC only if
1938 * the PMC's owner has sufficient privilege.
1941 for (ri = 0; ri < md->pmd_npmc; ri++)
1942 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL)
1943 if (pmc_can_attach(pm, td->td_proc) != 0)
1944 pmc_detach_one_process(td->td_proc,
1947 KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc,
1948 ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__,
1949 pp->pp_refcnt, pp));
1952 * If this process is no longer the target of any
1953 * PMCs, we can remove the process entry and free
1957 if (pp->pp_refcnt == 0) {
1958 pmc_remove_process_descriptor(pp);
1967 pmc_process_csw_in(td);
1970 case PMC_FN_CSW_OUT:
1971 pmc_process_csw_out(td);
1975 * Process accumulated PC samples.
1977 * This function is expected to be called by hardclock() for
1978 * each CPU that has accumulated PC samples.
1980 * This function is to be executed on the CPU whose samples
1981 * are being processed.
1983 case PMC_FN_DO_SAMPLES:
1986 * Clear the cpu specific bit in the CPU mask before
1987 * do the rest of the processing. If the NMI handler
1988 * gets invoked after the "atomic_clear_int()" call
1989 * below but before "pmc_process_samples()" gets
1990 * around to processing the interrupt, then we will
1991 * come back here at the next hardclock() tick (and
1992 * may find nothing to do if "pmc_process_samples()"
1993 * had already processed the interrupt). We don't
1994 * lose the interrupt sample.
1996 CPU_CLR_ATOMIC(PCPU_GET(cpuid), &pmc_cpumask);
1997 pmc_process_samples(PCPU_GET(cpuid), PMC_HR);
1998 pmc_process_samples(PCPU_GET(cpuid), PMC_SR);
2002 sx_assert(&pmc_sx, SX_LOCKED);
2003 pmc_process_mmap(td, (struct pmckern_map_in *) arg);
2007 sx_assert(&pmc_sx, SX_LOCKED);
2008 pmc_process_munmap(td, (struct pmckern_map_out *) arg);
2011 case PMC_FN_USER_CALLCHAIN:
2013 * Record a call chain.
2015 KASSERT(td == curthread, ("[pmc,%d] td != curthread",
2018 pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_HR,
2019 (struct trapframe *) arg);
2020 td->td_pflags &= ~TDP_CALLCHAIN;
2023 case PMC_FN_USER_CALLCHAIN_SOFT:
2025 * Record a call chain.
2027 KASSERT(td == curthread, ("[pmc,%d] td != curthread",
2029 pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_SR,
2030 (struct trapframe *) arg);
2031 td->td_pflags &= ~TDP_CALLCHAIN;
2034 case PMC_FN_SOFT_SAMPLING:
2036 * Call soft PMC sampling intr.
2038 pmc_soft_intr((struct pmckern_soft *) arg);
2043 KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function));
2053 * allocate a 'struct pmc_owner' descriptor in the owner hash table.
2056 static struct pmc_owner *
2057 pmc_allocate_owner_descriptor(struct proc *p)
2060 struct pmc_owner *po;
2061 struct pmc_ownerhash *poh;
2063 hindex = PMC_HASH_PTR(p, pmc_ownerhashmask);
2064 poh = &pmc_ownerhash[hindex];
2066 /* allocate space for N pointers and one descriptor struct */
2067 po = malloc(sizeof(struct pmc_owner), M_PMC, M_WAITOK|M_ZERO);
2069 LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */
2071 TAILQ_INIT(&po->po_logbuffers);
2072 mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc-per-proc", MTX_SPIN);
2074 PMCDBG4(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p",
2075 p, p->p_pid, p->p_comm, po);
2081 pmc_destroy_owner_descriptor(struct pmc_owner *po)
2084 PMCDBG4(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)",
2085 po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm);
2087 mtx_destroy(&po->po_mtx);
2092 * find the descriptor corresponding to process 'p', adding or removing it
2093 * as specified by 'mode'.
2096 static struct pmc_process *
2097 pmc_find_process_descriptor(struct proc *p, uint32_t mode)
2100 struct pmc_process *pp, *ppnew;
2101 struct pmc_processhash *pph;
2103 hindex = PMC_HASH_PTR(p, pmc_processhashmask);
2104 pph = &pmc_processhash[hindex];
2109 * Pre-allocate memory in the FIND_ALLOCATE case since we
2110 * cannot call malloc(9) once we hold a spin lock.
2112 if (mode & PMC_FLAG_ALLOCATE)
2113 ppnew = malloc(sizeof(struct pmc_process) + md->pmd_npmc *
2114 sizeof(struct pmc_targetstate), M_PMC, M_WAITOK|M_ZERO);
2116 mtx_lock_spin(&pmc_processhash_mtx);
2117 LIST_FOREACH(pp, pph, pp_next)
2118 if (pp->pp_proc == p)
2121 if ((mode & PMC_FLAG_REMOVE) && pp != NULL)
2122 LIST_REMOVE(pp, pp_next);
2124 if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL &&
2127 LIST_INSERT_HEAD(pph, ppnew, pp_next);
2131 mtx_unlock_spin(&pmc_processhash_mtx);
2133 if (pp != NULL && ppnew != NULL)
2140 * remove a process descriptor from the process hash table.
2144 pmc_remove_process_descriptor(struct pmc_process *pp)
2146 KASSERT(pp->pp_refcnt == 0,
2147 ("[pmc,%d] Removing process descriptor %p with count %d",
2148 __LINE__, pp, pp->pp_refcnt));
2150 mtx_lock_spin(&pmc_processhash_mtx);
2151 LIST_REMOVE(pp, pp_next);
2152 mtx_unlock_spin(&pmc_processhash_mtx);
2157 * find an owner descriptor corresponding to proc 'p'
2160 static struct pmc_owner *
2161 pmc_find_owner_descriptor(struct proc *p)
2164 struct pmc_owner *po;
2165 struct pmc_ownerhash *poh;
2167 hindex = PMC_HASH_PTR(p, pmc_ownerhashmask);
2168 poh = &pmc_ownerhash[hindex];
2171 LIST_FOREACH(po, poh, po_next)
2172 if (po->po_owner == p)
2175 PMCDBG5(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> "
2176 "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po);
2182 * pmc_allocate_pmc_descriptor
2184 * Allocate a pmc descriptor and initialize its
2189 pmc_allocate_pmc_descriptor(void)
2193 pmc = malloc(sizeof(struct pmc), M_PMC, M_WAITOK|M_ZERO);
2195 PMCDBG1(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc);
2201 * Destroy a pmc descriptor.
2205 pmc_destroy_pmc_descriptor(struct pmc *pm)
2208 KASSERT(pm->pm_state == PMC_STATE_DELETED ||
2209 pm->pm_state == PMC_STATE_FREE,
2210 ("[pmc,%d] destroying non-deleted PMC", __LINE__));
2211 KASSERT(LIST_EMPTY(&pm->pm_targets),
2212 ("[pmc,%d] destroying pmc with targets", __LINE__));
2213 KASSERT(pm->pm_owner == NULL,
2214 ("[pmc,%d] destroying pmc attached to an owner", __LINE__));
2215 KASSERT(pm->pm_runcount == 0,
2216 ("[pmc,%d] pmc has non-zero run count %d", __LINE__,
2223 pmc_wait_for_pmc_idle(struct pmc *pm)
2226 volatile int maxloop;
2228 maxloop = 100 * pmc_cpu_max();
2231 * Loop (with a forced context switch) till the PMC's runcount
2232 * comes down to zero.
2234 while (atomic_load_acq_32(&pm->pm_runcount) > 0) {
2237 KASSERT(maxloop > 0,
2238 ("[pmc,%d] (ri%d, rc%d) waiting too long for "
2239 "pmc to be free", __LINE__,
2240 PMC_TO_ROWINDEX(pm), pm->pm_runcount));
2242 pmc_force_context_switch();
2247 * This function does the following things:
2249 * - detaches the PMC from hardware
2250 * - unlinks all target threads that were attached to it
2251 * - removes the PMC from its owner's list
2252 * - destroys the PMC private mutex
2254 * Once this function completes, the given pmc pointer can be freed by
2255 * calling pmc_destroy_pmc_descriptor().
2259 pmc_release_pmc_descriptor(struct pmc *pm)
2263 u_int adjri, ri, cpu;
2264 struct pmc_owner *po;
2265 struct pmc_binding pb;
2266 struct pmc_process *pp;
2267 struct pmc_classdep *pcd;
2268 struct pmc_target *ptgt, *tmp;
2270 sx_assert(&pmc_sx, SX_XLOCKED);
2272 KASSERT(pm, ("[pmc,%d] null pmc", __LINE__));
2274 ri = PMC_TO_ROWINDEX(pm);
2275 pcd = pmc_ri_to_classdep(md, ri, &adjri);
2276 mode = PMC_TO_MODE(pm);
2278 PMCDBG3(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri,
2282 * First, we take the PMC off hardware.
2285 if (PMC_IS_SYSTEM_MODE(mode)) {
2288 * A system mode PMC runs on a specific CPU. Switch
2289 * to this CPU and turn hardware off.
2291 pmc_save_cpu_binding(&pb);
2293 cpu = PMC_TO_CPU(pm);
2295 pmc_select_cpu(cpu);
2297 /* switch off non-stalled CPUs */
2298 CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate);
2299 if (pm->pm_state == PMC_STATE_RUNNING &&
2300 !CPU_ISSET(cpu, &pm->pm_stalled)) {
2302 phw = pmc_pcpu[cpu]->pc_hwpmcs[ri];
2304 KASSERT(phw->phw_pmc == pm,
2305 ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)",
2306 __LINE__, ri, phw->phw_pmc, pm));
2307 PMCDBG2(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri);
2310 pcd->pcd_stop_pmc(cpu, adjri);
2314 PMCDBG2(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri);
2317 pcd->pcd_config_pmc(cpu, adjri, NULL);
2320 /* adjust the global and process count of SS mode PMCs */
2321 if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) {
2324 if (po->po_sscount == 0) {
2325 atomic_subtract_rel_int(&pmc_ss_count, 1);
2326 LIST_REMOVE(po, po_ssnext);
2330 pm->pm_state = PMC_STATE_DELETED;
2332 pmc_restore_cpu_binding(&pb);
2335 * We could have references to this PMC structure in
2336 * the per-cpu sample queues. Wait for the queue to
2339 pmc_wait_for_pmc_idle(pm);
2341 } else if (PMC_IS_VIRTUAL_MODE(mode)) {
2344 * A virtual PMC could be running on multiple CPUs at
2347 * By marking its state as DELETED, we ensure that
2348 * this PMC is never further scheduled on hardware.
2350 * Then we wait till all CPUs are done with this PMC.
2352 pm->pm_state = PMC_STATE_DELETED;
2355 /* Wait for the PMCs runcount to come to zero. */
2356 pmc_wait_for_pmc_idle(pm);
2359 * At this point the PMC is off all CPUs and cannot be
2360 * freshly scheduled onto a CPU. It is now safe to
2361 * unlink all targets from this PMC. If a
2362 * process-record's refcount falls to zero, we remove
2363 * it from the hash table. The module-wide SX lock
2364 * protects us from races.
2366 LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) {
2367 pp = ptgt->pt_process;
2368 pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */
2370 PMCDBG1(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt);
2373 * If the target process record shows that no
2374 * PMCs are attached to it, reclaim its space.
2377 if (pp->pp_refcnt == 0) {
2378 pmc_remove_process_descriptor(pp);
2383 cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */
2388 * Release any MD resources
2390 (void) pcd->pcd_release_pmc(cpu, adjri, pm);
2393 * Update row disposition
2396 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm)))
2397 PMC_UNMARK_ROW_STANDALONE(ri);
2399 PMC_UNMARK_ROW_THREAD(ri);
2401 /* unlink from the owner's list */
2403 LIST_REMOVE(pm, pm_next);
2404 pm->pm_owner = NULL;
2409 * Register an owner and a pmc.
2413 pmc_register_owner(struct proc *p, struct pmc *pmc)
2415 struct pmc_owner *po;
2417 sx_assert(&pmc_sx, SX_XLOCKED);
2419 if ((po = pmc_find_owner_descriptor(p)) == NULL)
2420 if ((po = pmc_allocate_owner_descriptor(p)) == NULL)
2423 KASSERT(pmc->pm_owner == NULL,
2424 ("[pmc,%d] attempting to own an initialized PMC", __LINE__));
2427 LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next);
2430 p->p_flag |= P_HWPMC;
2433 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
2434 pmclog_process_pmcallocate(pmc);
2436 PMCDBG2(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p",
2443 * Return the current row disposition:
2445 * > 0 => PROCESS MODE
2446 * < 0 => SYSTEM MODE
2450 pmc_getrowdisp(int ri)
2452 return pmc_pmcdisp[ri];
2456 * Check if a PMC at row index 'ri' can be allocated to the current
2459 * Allocation can fail if:
2460 * - the current process is already being profiled by a PMC at index 'ri',
2461 * attached to it via OP_PMCATTACH.
2462 * - the current process has already allocated a PMC at index 'ri'
2467 pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu)
2471 struct pmc_owner *po;
2472 struct pmc_process *pp;
2474 PMCDBG5(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d "
2475 "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu);
2478 * We shouldn't have already allocated a process-mode PMC at
2481 * We shouldn't have allocated a system-wide PMC on the same
2484 if ((po = pmc_find_owner_descriptor(p)) != NULL)
2485 LIST_FOREACH(pm, &po->po_pmcs, pm_next) {
2486 if (PMC_TO_ROWINDEX(pm) == ri) {
2487 mode = PMC_TO_MODE(pm);
2488 if (PMC_IS_VIRTUAL_MODE(mode))
2490 if (PMC_IS_SYSTEM_MODE(mode) &&
2491 (int) PMC_TO_CPU(pm) == cpu)
2497 * We also shouldn't be the target of any PMC at this index
2498 * since otherwise a PMC_ATTACH to ourselves will fail.
2500 if ((pp = pmc_find_process_descriptor(p, 0)) != NULL)
2501 if (pp->pp_pmcs[ri].pp_pmc)
2504 PMCDBG4(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok",
2505 p, p->p_pid, p->p_comm, ri);
2511 * Check if a given PMC at row index 'ri' can be currently used in
2516 pmc_can_allocate_row(int ri, enum pmc_mode mode)
2520 sx_assert(&pmc_sx, SX_XLOCKED);
2522 PMCDBG2(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode);
2524 if (PMC_IS_SYSTEM_MODE(mode))
2525 disp = PMC_DISP_STANDALONE;
2527 disp = PMC_DISP_THREAD;
2530 * check disposition for PMC row 'ri':
2532 * Expected disposition Row-disposition Result
2534 * STANDALONE STANDALONE or FREE proceed
2535 * STANDALONE THREAD fail
2536 * THREAD THREAD or FREE proceed
2537 * THREAD STANDALONE fail
2540 if (!PMC_ROW_DISP_IS_FREE(ri) &&
2541 !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) &&
2542 !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri)))
2549 PMCDBG2(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode);
2556 * Find a PMC descriptor with user handle 'pmcid' for thread 'td'.
2560 pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid)
2564 KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc,
2565 ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__,
2566 PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc));
2568 LIST_FOREACH(pm, &po->po_pmcs, pm_next)
2569 if (pm->pm_id == pmcid)
2576 pmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc)
2579 struct pmc *pm, *opm;
2580 struct pmc_owner *po;
2581 struct pmc_process *pp;
2583 PMCDBG1(PMC,FND,1, "find-pmc id=%d", pmcid);
2584 if (PMC_ID_TO_ROWINDEX(pmcid) >= md->pmd_npmc)
2587 if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) {
2589 * In case of PMC_F_DESCENDANTS child processes we will not find
2590 * the current process in the owners hash list. Find the owner
2591 * process first and from there lookup the po.
2593 if ((pp = pmc_find_process_descriptor(curthread->td_proc,
2594 PMC_FLAG_NONE)) == NULL) {
2597 opm = pp->pp_pmcs[PMC_ID_TO_ROWINDEX(pmcid)].pp_pmc;
2600 if ((opm->pm_flags & (PMC_F_ATTACHED_TO_OWNER|
2601 PMC_F_DESCENDANTS)) != (PMC_F_ATTACHED_TO_OWNER|
2608 if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL)
2611 PMCDBG2(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm);
2622 pmc_start(struct pmc *pm)
2625 struct pmc_owner *po;
2626 struct pmc_binding pb;
2627 struct pmc_classdep *pcd;
2628 int adjri, error, cpu, ri;
2631 ("[pmc,%d] null pm", __LINE__));
2633 mode = PMC_TO_MODE(pm);
2634 ri = PMC_TO_ROWINDEX(pm);
2635 pcd = pmc_ri_to_classdep(md, ri, &adjri);
2639 PMCDBG3(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri);
2644 * Disallow PMCSTART if a logfile is required but has not been
2647 if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) &&
2648 (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
2649 return (EDOOFUS); /* programming error */
2652 * If this is a sampling mode PMC, log mapping information for
2653 * the kernel modules that are currently loaded.
2655 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
2656 pmc_log_kernel_mappings(pm);
2658 if (PMC_IS_VIRTUAL_MODE(mode)) {
2661 * If a PMCATTACH has never been done on this PMC,
2662 * attach it to its owner process.
2665 if (LIST_EMPTY(&pm->pm_targets))
2666 error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH :
2667 pmc_attach_process(po->po_owner, pm);
2670 * If the PMC is attached to its owner, then force a context
2671 * switch to ensure that the MD state gets set correctly.
2675 pm->pm_state = PMC_STATE_RUNNING;
2676 if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER)
2677 pmc_force_context_switch();
2685 * A system-wide PMC.
2687 * Add the owner to the global list if this is a system-wide
2691 if (mode == PMC_MODE_SS) {
2692 if (po->po_sscount == 0) {
2693 LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext);
2694 atomic_add_rel_int(&pmc_ss_count, 1);
2695 PMCDBG1(PMC,OPS,1, "po=%p in global list", po);
2700 * Log mapping information for all existing processes in the
2701 * system. Subsequent mappings are logged as they happen;
2702 * see pmc_process_mmap().
2704 if (po->po_logprocmaps == 0) {
2705 pmc_log_all_process_mappings(po);
2706 po->po_logprocmaps = 1;
2711 * Move to the CPU associated with this
2712 * PMC, and start the hardware.
2715 pmc_save_cpu_binding(&pb);
2717 cpu = PMC_TO_CPU(pm);
2719 if (!pmc_cpu_is_active(cpu))
2722 pmc_select_cpu(cpu);
2725 * global PMCs are configured at allocation time
2726 * so write out the initial value and start the PMC.
2729 pm->pm_state = PMC_STATE_RUNNING;
2732 if ((error = pcd->pcd_write_pmc(cpu, adjri,
2733 PMC_IS_SAMPLING_MODE(mode) ?
2734 pm->pm_sc.pm_reloadcount :
2735 pm->pm_sc.pm_initial)) == 0) {
2736 /* If a sampling mode PMC, reset stalled state. */
2737 if (PMC_IS_SAMPLING_MODE(mode))
2738 CPU_CLR_ATOMIC(cpu, &pm->pm_stalled);
2740 /* Indicate that we desire this to run. Start it. */
2741 CPU_SET_ATOMIC(cpu, &pm->pm_cpustate);
2742 error = pcd->pcd_start_pmc(cpu, adjri);
2746 pmc_restore_cpu_binding(&pb);
2756 pmc_stop(struct pmc *pm)
2758 struct pmc_owner *po;
2759 struct pmc_binding pb;
2760 struct pmc_classdep *pcd;
2761 int adjri, cpu, error, ri;
2763 KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__));
2765 PMCDBG3(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm,
2766 PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm));
2768 pm->pm_state = PMC_STATE_STOPPED;
2771 * If the PMC is a virtual mode one, changing the state to
2772 * non-RUNNING is enough to ensure that the PMC never gets
2775 * If this PMC is current running on a CPU, then it will
2776 * handled correctly at the time its target process is context
2780 if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)))
2784 * A system-mode PMC. Move to the CPU associated with
2785 * this PMC, and stop the hardware. We update the
2786 * 'initial count' so that a subsequent PMCSTART will
2787 * resume counting from the current hardware count.
2790 pmc_save_cpu_binding(&pb);
2792 cpu = PMC_TO_CPU(pm);
2794 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
2795 ("[pmc,%d] illegal cpu=%d", __LINE__, cpu));
2797 if (!pmc_cpu_is_active(cpu))
2800 pmc_select_cpu(cpu);
2802 ri = PMC_TO_ROWINDEX(pm);
2803 pcd = pmc_ri_to_classdep(md, ri, &adjri);
2805 CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate);
2807 if ((error = pcd->pcd_stop_pmc(cpu, adjri)) == 0)
2808 error = pcd->pcd_read_pmc(cpu, adjri, &pm->pm_sc.pm_initial);
2811 pmc_restore_cpu_binding(&pb);
2815 /* remove this owner from the global list of SS PMC owners */
2816 if (PMC_TO_MODE(pm) == PMC_MODE_SS) {
2818 if (po->po_sscount == 0) {
2819 atomic_subtract_rel_int(&pmc_ss_count, 1);
2820 LIST_REMOVE(po, po_ssnext);
2821 PMCDBG1(PMC,OPS,2,"po=%p removed from global list", po);
2830 static const char *pmc_op_to_name[] = {
2832 #define __PMC_OP(N, D) #N ,
2839 * The syscall interface
2842 #define PMC_GET_SX_XLOCK(...) do { \
2843 sx_xlock(&pmc_sx); \
2844 if (pmc_hook == NULL) { \
2845 sx_xunlock(&pmc_sx); \
2846 return __VA_ARGS__; \
2850 #define PMC_DOWNGRADE_SX() do { \
2851 sx_downgrade(&pmc_sx); \
2852 is_sx_downgraded = 1; \
2856 pmc_syscall_handler(struct thread *td, void *syscall_args)
2858 int error, is_sx_downgraded, op;
2859 struct pmc_syscall_args *c;
2860 void *pmclog_proc_handle;
2863 c = (struct pmc_syscall_args *)syscall_args;
2866 if (op == PMC_OP_CONFIGURELOG) {
2868 * We cannot create the logging process inside
2869 * pmclog_configure_log() because there is a LOR
2870 * between pmc_sx and process structure locks.
2871 * Instead, pre-create the process and ignite the loop
2872 * if everything is fine, otherwise direct the process
2875 error = pmclog_proc_create(td, &pmclog_proc_handle);
2880 PMC_GET_SX_XLOCK(ENOSYS);
2881 is_sx_downgraded = 0;
2883 PMCDBG3(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op,
2884 pmc_op_to_name[op], arg);
2887 atomic_add_int(&pmc_stats.pm_syscalls, 1);
2893 * Configure a log file.
2895 * XXX This OP will be reworked.
2898 case PMC_OP_CONFIGURELOG:
2902 struct pmc_owner *po;
2903 struct pmc_op_configurelog cl;
2905 if ((error = copyin(arg, &cl, sizeof(cl))) != 0) {
2906 pmclog_proc_ignite(pmclog_proc_handle, NULL);
2910 /* mark this process as owning a log file */
2912 if ((po = pmc_find_owner_descriptor(p)) == NULL)
2913 if ((po = pmc_allocate_owner_descriptor(p)) == NULL) {
2914 pmclog_proc_ignite(pmclog_proc_handle, NULL);
2920 * If a valid fd was passed in, try to configure that,
2921 * otherwise if 'fd' was less than zero and there was
2922 * a log file configured, flush its buffers and
2925 if (cl.pm_logfd >= 0) {
2926 error = pmclog_configure_log(md, po, cl.pm_logfd);
2927 pmclog_proc_ignite(pmclog_proc_handle, error == 0 ?
2929 } else if (po->po_flags & PMC_PO_OWNS_LOGFILE) {
2930 pmclog_proc_ignite(pmclog_proc_handle, NULL);
2931 error = pmclog_close(po);
2933 LIST_FOREACH(pm, &po->po_pmcs, pm_next)
2934 if (pm->pm_flags & PMC_F_NEEDS_LOGFILE &&
2935 pm->pm_state == PMC_STATE_RUNNING)
2937 error = pmclog_deconfigure_log(po);
2940 pmclog_proc_ignite(pmclog_proc_handle, NULL);
2950 case PMC_OP_FLUSHLOG:
2952 struct pmc_owner *po;
2954 sx_assert(&pmc_sx, SX_XLOCKED);
2956 if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) {
2961 error = pmclog_flush(po);
2969 case PMC_OP_CLOSELOG:
2971 struct pmc_owner *po;
2973 sx_assert(&pmc_sx, SX_XLOCKED);
2975 if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) {
2980 error = pmclog_close(po);
2985 * Retrieve hardware configuration.
2988 case PMC_OP_GETCPUINFO: /* CPU information */
2990 struct pmc_op_getcpuinfo gci;
2991 struct pmc_classinfo *pci;
2992 struct pmc_classdep *pcd;
2995 gci.pm_cputype = md->pmd_cputype;
2996 gci.pm_ncpu = pmc_cpu_max();
2997 gci.pm_npmc = md->pmd_npmc;
2998 gci.pm_nclass = md->pmd_nclass;
2999 pci = gci.pm_classes;
3000 pcd = md->pmd_classdep;
3001 for (cl = 0; cl < md->pmd_nclass; cl++, pci++, pcd++) {
3002 pci->pm_caps = pcd->pcd_caps;
3003 pci->pm_class = pcd->pcd_class;
3004 pci->pm_width = pcd->pcd_width;
3005 pci->pm_num = pcd->pcd_num;
3007 error = copyout(&gci, arg, sizeof(gci));
3012 * Retrieve soft events list.
3014 case PMC_OP_GETDYNEVENTINFO:
3018 struct pmc_op_getdyneventinfo *gei;
3019 struct pmc_dyn_event_descr dev;
3020 struct pmc_soft *ps;
3023 sx_assert(&pmc_sx, SX_LOCKED);
3025 gei = (struct pmc_op_getdyneventinfo *) arg;
3027 if ((error = copyin(&gei->pm_class, &cl, sizeof(cl))) != 0)
3030 /* Only SOFT class is dynamic. */
3031 if (cl != PMC_CLASS_SOFT) {
3037 for (ev = PMC_EV_SOFT_FIRST; (int)ev <= PMC_EV_SOFT_LAST; ev++) {
3038 ps = pmc_soft_ev_acquire(ev);
3041 bcopy(&ps->ps_ev, &dev, sizeof(dev));
3042 pmc_soft_ev_release(ps);
3044 error = copyout(&dev,
3045 &gei->pm_events[nevent],
3046 sizeof(struct pmc_dyn_event_descr));
3054 error = copyout(&nevent, &gei->pm_nevent,
3060 * Get module statistics
3063 case PMC_OP_GETDRIVERSTATS:
3065 struct pmc_op_getdriverstats gms;
3067 bcopy(&pmc_stats, &gms, sizeof(gms));
3068 error = copyout(&gms, arg, sizeof(gms));
3074 * Retrieve module version number
3077 case PMC_OP_GETMODULEVERSION:
3081 /* retrieve the client's idea of the ABI version */
3082 if ((error = copyin(arg, &cv, sizeof(uint32_t))) != 0)
3084 /* don't service clients newer than our driver */
3086 if ((cv & 0xFFFF0000) > (modv & 0xFFFF0000)) {
3087 error = EPROGMISMATCH;
3090 error = copyout(&modv, arg, sizeof(int));
3096 * Retrieve the state of all the PMCs on a given
3100 case PMC_OP_GETPMCINFO:
3104 size_t pmcinfo_size;
3105 uint32_t cpu, n, npmc;
3106 struct pmc_owner *po;
3107 struct pmc_binding pb;
3108 struct pmc_classdep *pcd;
3109 struct pmc_info *p, *pmcinfo;
3110 struct pmc_op_getpmcinfo *gpi;
3114 gpi = (struct pmc_op_getpmcinfo *) arg;
3116 if ((error = copyin(&gpi->pm_cpu, &cpu, sizeof(cpu))) != 0)
3119 if (cpu >= pmc_cpu_max()) {
3124 if (!pmc_cpu_is_active(cpu)) {
3129 /* switch to CPU 'cpu' */
3130 pmc_save_cpu_binding(&pb);
3131 pmc_select_cpu(cpu);
3133 npmc = md->pmd_npmc;
3135 pmcinfo_size = npmc * sizeof(struct pmc_info);
3136 pmcinfo = malloc(pmcinfo_size, M_PMC, M_WAITOK);
3140 for (n = 0; n < md->pmd_npmc; n++, p++) {
3142 pcd = pmc_ri_to_classdep(md, n, &ari);
3144 KASSERT(pcd != NULL,
3145 ("[pmc,%d] null pcd ri=%d", __LINE__, n));
3147 if ((error = pcd->pcd_describe(cpu, ari, p, &pm)) != 0)
3150 if (PMC_ROW_DISP_IS_STANDALONE(n))
3151 p->pm_rowdisp = PMC_DISP_STANDALONE;
3152 else if (PMC_ROW_DISP_IS_THREAD(n))
3153 p->pm_rowdisp = PMC_DISP_THREAD;
3155 p->pm_rowdisp = PMC_DISP_FREE;
3157 p->pm_ownerpid = -1;
3159 if (pm == NULL) /* no PMC associated */
3164 KASSERT(po->po_owner != NULL,
3165 ("[pmc,%d] pmc_owner had a null proc pointer",
3168 p->pm_ownerpid = po->po_owner->p_pid;
3169 p->pm_mode = PMC_TO_MODE(pm);
3170 p->pm_event = pm->pm_event;
3171 p->pm_flags = pm->pm_flags;
3173 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
3175 pm->pm_sc.pm_reloadcount;
3178 pmc_restore_cpu_binding(&pb);
3180 /* now copy out the PMC info collected */
3182 error = copyout(pmcinfo, &gpi->pm_pmcs, pmcinfo_size);
3184 free(pmcinfo, M_PMC);
3190 * Set the administrative state of a PMC. I.e. whether
3191 * the PMC is to be used or not.
3194 case PMC_OP_PMCADMIN:
3197 enum pmc_state request;
3200 struct pmc_op_pmcadmin pma;
3201 struct pmc_binding pb;
3203 sx_assert(&pmc_sx, SX_XLOCKED);
3205 KASSERT(td == curthread,
3206 ("[pmc,%d] td != curthread", __LINE__));
3208 error = priv_check(td, PRIV_PMC_MANAGE);
3212 if ((error = copyin(arg, &pma, sizeof(pma))) != 0)
3217 if (cpu < 0 || cpu >= (int) pmc_cpu_max()) {
3222 if (!pmc_cpu_is_active(cpu)) {
3227 request = pma.pm_state;
3229 if (request != PMC_STATE_DISABLED &&
3230 request != PMC_STATE_FREE) {
3235 ri = pma.pm_pmc; /* pmc id == row index */
3236 if (ri < 0 || ri >= (int) md->pmd_npmc) {
3242 * We can't disable a PMC with a row-index allocated
3243 * for process virtual PMCs.
3246 if (PMC_ROW_DISP_IS_THREAD(ri) &&
3247 request == PMC_STATE_DISABLED) {
3253 * otherwise, this PMC on this CPU is either free or
3254 * in system-wide mode.
3257 pmc_save_cpu_binding(&pb);
3258 pmc_select_cpu(cpu);
3261 phw = pc->pc_hwpmcs[ri];
3264 * XXX do we need some kind of 'forced' disable?
3267 if (phw->phw_pmc == NULL) {
3268 if (request == PMC_STATE_DISABLED &&
3269 (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED)) {
3270 phw->phw_state &= ~PMC_PHW_FLAG_IS_ENABLED;
3271 PMC_MARK_ROW_STANDALONE(ri);
3272 } else if (request == PMC_STATE_FREE &&
3273 (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0) {
3274 phw->phw_state |= PMC_PHW_FLAG_IS_ENABLED;
3275 PMC_UNMARK_ROW_STANDALONE(ri);
3277 /* other cases are a no-op */
3281 pmc_restore_cpu_binding(&pb);
3290 case PMC_OP_PMCALLOCATE:
3298 struct pmc_binding pb;
3299 struct pmc_classdep *pcd;
3300 struct pmc_op_pmcallocate pa;
3302 if ((error = copyin(arg, &pa, sizeof(pa))) != 0)
3309 if ((mode != PMC_MODE_SS && mode != PMC_MODE_SC &&
3310 mode != PMC_MODE_TS && mode != PMC_MODE_TC) ||
3311 (cpu != (u_int) PMC_CPU_ANY && cpu >= pmc_cpu_max())) {
3317 * Virtual PMCs should only ask for a default CPU.
3318 * System mode PMCs need to specify a non-default CPU.
3321 if ((PMC_IS_VIRTUAL_MODE(mode) && cpu != (u_int) PMC_CPU_ANY) ||
3322 (PMC_IS_SYSTEM_MODE(mode) && cpu == (u_int) PMC_CPU_ANY)) {
3328 * Check that an inactive CPU is not being asked for.
3331 if (PMC_IS_SYSTEM_MODE(mode) && !pmc_cpu_is_active(cpu)) {
3337 * Refuse an allocation for a system-wide PMC if this
3338 * process has been jailed, or if this process lacks
3339 * super-user credentials and the sysctl tunable
3340 * 'security.bsd.unprivileged_syspmcs' is zero.
3343 if (PMC_IS_SYSTEM_MODE(mode)) {
3344 if (jailed(curthread->td_ucred)) {
3348 if (!pmc_unprivileged_syspmcs) {
3349 error = priv_check(curthread,
3357 * Look for valid values for 'pm_flags'
3360 if ((pa.pm_flags & ~(PMC_F_DESCENDANTS | PMC_F_LOG_PROCCSW |
3361 PMC_F_LOG_PROCEXIT | PMC_F_CALLCHAIN)) != 0) {
3366 /* process logging options are not allowed for system PMCs */
3367 if (PMC_IS_SYSTEM_MODE(mode) && (pa.pm_flags &
3368 (PMC_F_LOG_PROCCSW | PMC_F_LOG_PROCEXIT))) {
3374 * All sampling mode PMCs need to be able to interrupt the
3377 if (PMC_IS_SAMPLING_MODE(mode))
3378 caps |= PMC_CAP_INTERRUPT;
3380 /* A valid class specifier should have been passed in. */
3381 for (n = 0; n < md->pmd_nclass; n++)
3382 if (md->pmd_classdep[n].pcd_class == pa.pm_class)
3384 if (n == md->pmd_nclass) {
3389 /* The requested PMC capabilities should be feasible. */
3390 if ((md->pmd_classdep[n].pcd_caps & caps) != caps) {
3395 PMCDBG4(PMC,ALL,2, "event=%d caps=0x%x mode=%d cpu=%d",
3396 pa.pm_ev, caps, mode, cpu);
3398 pmc = pmc_allocate_pmc_descriptor();
3399 pmc->pm_id = PMC_ID_MAKE_ID(cpu,pa.pm_mode,pa.pm_class,
3401 pmc->pm_event = pa.pm_ev;
3402 pmc->pm_state = PMC_STATE_FREE;
3403 pmc->pm_caps = caps;
3404 pmc->pm_flags = pa.pm_flags;
3406 /* switch thread to CPU 'cpu' */
3407 pmc_save_cpu_binding(&pb);
3409 #define PMC_IS_SHAREABLE_PMC(cpu, n) \
3410 (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_state & \
3411 PMC_PHW_FLAG_IS_SHAREABLE)
3412 #define PMC_IS_UNALLOCATED(cpu, n) \
3413 (pmc_pcpu[(cpu)]->pc_hwpmcs[(n)]->phw_pmc == NULL)
3415 if (PMC_IS_SYSTEM_MODE(mode)) {
3416 pmc_select_cpu(cpu);
3417 for (n = 0; n < (int) md->pmd_npmc; n++) {
3418 pcd = pmc_ri_to_classdep(md, n, &adjri);
3419 if (pmc_can_allocate_row(n, mode) == 0 &&
3420 pmc_can_allocate_rowindex(
3421 curthread->td_proc, n, cpu) == 0 &&
3422 (PMC_IS_UNALLOCATED(cpu, n) ||
3423 PMC_IS_SHAREABLE_PMC(cpu, n)) &&
3424 pcd->pcd_allocate_pmc(cpu, adjri, pmc,
3429 /* Process virtual mode */
3430 for (n = 0; n < (int) md->pmd_npmc; n++) {
3431 pcd = pmc_ri_to_classdep(md, n, &adjri);
3432 if (pmc_can_allocate_row(n, mode) == 0 &&
3433 pmc_can_allocate_rowindex(
3434 curthread->td_proc, n,
3435 PMC_CPU_ANY) == 0 &&
3436 pcd->pcd_allocate_pmc(curthread->td_oncpu,
3437 adjri, pmc, &pa) == 0)
3442 #undef PMC_IS_UNALLOCATED
3443 #undef PMC_IS_SHAREABLE_PMC
3445 pmc_restore_cpu_binding(&pb);
3447 if (n == (int) md->pmd_npmc) {
3448 pmc_destroy_pmc_descriptor(pmc);
3454 /* Fill in the correct value in the ID field */
3455 pmc->pm_id = PMC_ID_MAKE_ID(cpu,mode,pa.pm_class,n);
3457 PMCDBG5(PMC,ALL,2, "ev=%d class=%d mode=%d n=%d -> pmcid=%x",
3458 pmc->pm_event, pa.pm_class, mode, n, pmc->pm_id);
3460 /* Process mode PMCs with logging enabled need log files */
3461 if (pmc->pm_flags & (PMC_F_LOG_PROCEXIT | PMC_F_LOG_PROCCSW))
3462 pmc->pm_flags |= PMC_F_NEEDS_LOGFILE;
3464 /* All system mode sampling PMCs require a log file */
3465 if (PMC_IS_SAMPLING_MODE(mode) && PMC_IS_SYSTEM_MODE(mode))
3466 pmc->pm_flags |= PMC_F_NEEDS_LOGFILE;
3469 * Configure global pmc's immediately
3472 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pmc))) {
3474 pmc_save_cpu_binding(&pb);
3475 pmc_select_cpu(cpu);
3477 phw = pmc_pcpu[cpu]->pc_hwpmcs[n];
3478 pcd = pmc_ri_to_classdep(md, n, &adjri);
3480 if ((phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) == 0 ||
3481 (error = pcd->pcd_config_pmc(cpu, adjri, pmc)) != 0) {
3482 (void) pcd->pcd_release_pmc(cpu, adjri, pmc);
3483 pmc_destroy_pmc_descriptor(pmc);
3485 pmc_restore_cpu_binding(&pb);
3490 pmc_restore_cpu_binding(&pb);
3493 pmc->pm_state = PMC_STATE_ALLOCATED;
3496 * mark row disposition
3499 if (PMC_IS_SYSTEM_MODE(mode))
3500 PMC_MARK_ROW_STANDALONE(n);
3502 PMC_MARK_ROW_THREAD(n);
3505 * Register this PMC with the current thread as its owner.
3509 pmc_register_owner(curthread->td_proc, pmc)) != 0) {
3510 pmc_release_pmc_descriptor(pmc);
3511 pmc_destroy_pmc_descriptor(pmc);
3517 * Return the allocated index.
3520 pa.pm_pmcid = pmc->pm_id;
3522 error = copyout(&pa, arg, sizeof(pa));
3528 * Attach a PMC to a process.
3531 case PMC_OP_PMCATTACH:
3535 struct pmc_op_pmcattach a;
3537 sx_assert(&pmc_sx, SX_XLOCKED);
3539 if ((error = copyin(arg, &a, sizeof(a))) != 0)
3545 } else if (a.pm_pid == 0)
3546 a.pm_pid = td->td_proc->p_pid;
3548 if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0)
3551 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm))) {
3556 /* PMCs may be (re)attached only when allocated or stopped */
3557 if (pm->pm_state == PMC_STATE_RUNNING) {
3560 } else if (pm->pm_state != PMC_STATE_ALLOCATED &&
3561 pm->pm_state != PMC_STATE_STOPPED) {
3567 if ((p = pfind(a.pm_pid)) == NULL) {
3573 * Ignore processes that are working on exiting.
3575 if (p->p_flag & P_WEXIT) {
3577 PROC_UNLOCK(p); /* pfind() returns a locked process */
3582 * we are allowed to attach a PMC to a process if
3585 error = p_candebug(curthread, p);
3590 error = pmc_attach_process(p, pm);
3596 * Detach an attached PMC from a process.
3599 case PMC_OP_PMCDETACH:
3603 struct pmc_op_pmcattach a;
3605 if ((error = copyin(arg, &a, sizeof(a))) != 0)
3611 } else if (a.pm_pid == 0)
3612 a.pm_pid = td->td_proc->p_pid;
3614 if ((error = pmc_find_pmc(a.pm_pmc, &pm)) != 0)
3617 if ((p = pfind(a.pm_pid)) == NULL) {
3623 * Treat processes that are in the process of exiting
3624 * as if they were not present.
3627 if (p->p_flag & P_WEXIT)
3630 PROC_UNLOCK(p); /* pfind() returns a locked process */
3633 error = pmc_detach_process(p, pm);
3639 * Retrieve the MSR number associated with the counter
3640 * 'pmc_id'. This allows processes to directly use RDPMC
3641 * instructions to read their PMCs, without the overhead of a
3645 case PMC_OP_PMCGETMSR:
3649 struct pmc_target *pt;
3650 struct pmc_op_getmsr gm;
3651 struct pmc_classdep *pcd;
3655 if ((error = copyin(arg, &gm, sizeof(gm))) != 0)
3658 if ((error = pmc_find_pmc(gm.pm_pmcid, &pm)) != 0)
3662 * The allocated PMC has to be a process virtual PMC,
3663 * i.e., of type MODE_T[CS]. Global PMCs can only be
3664 * read using the PMCREAD operation since they may be
3665 * allocated on a different CPU than the one we could
3666 * be running on at the time of the RDPMC instruction.
3668 * The GETMSR operation is not allowed for PMCs that
3669 * are inherited across processes.
3672 if (!PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)) ||
3673 (pm->pm_flags & PMC_F_DESCENDANTS)) {
3679 * It only makes sense to use a RDPMC (or its
3680 * equivalent instruction on non-x86 architectures) on
3681 * a process that has allocated and attached a PMC to
3682 * itself. Conversely the PMC is only allowed to have
3683 * one process attached to it -- its owner.
3686 if ((pt = LIST_FIRST(&pm->pm_targets)) == NULL ||
3687 LIST_NEXT(pt, pt_next) != NULL ||
3688 pt->pt_process->pp_proc != pm->pm_owner->po_owner) {
3693 ri = PMC_TO_ROWINDEX(pm);
3694 pcd = pmc_ri_to_classdep(md, ri, &adjri);
3696 /* PMC class has no 'GETMSR' support */
3697 if (pcd->pcd_get_msr == NULL) {
3702 if ((error = (*pcd->pcd_get_msr)(adjri, &gm.pm_msr)) < 0)
3705 if ((error = copyout(&gm, arg, sizeof(gm))) < 0)
3709 * Mark our process as using MSRs. Update machine
3710 * state using a forced context switch.
3713 pt->pt_process->pp_flags |= PMC_PP_ENABLE_MSR_ACCESS;
3714 pmc_force_context_switch();
3720 * Release an allocated PMC
3723 case PMC_OP_PMCRELEASE:
3727 struct pmc_owner *po;
3728 struct pmc_op_simple sp;
3731 * Find PMC pointer for the named PMC.
3733 * Use pmc_release_pmc_descriptor() to switch off the
3734 * PMC, remove all its target threads, and remove the
3735 * PMC from its owner's list.
3737 * Remove the owner record if this is the last PMC
3743 if ((error = copyin(arg, &sp, sizeof(sp))) != 0)
3746 pmcid = sp.pm_pmcid;
3748 if ((error = pmc_find_pmc(pmcid, &pm)) != 0)
3752 pmc_release_pmc_descriptor(pm);
3753 pmc_maybe_remove_owner(po);
3754 pmc_destroy_pmc_descriptor(pm);
3760 * Read and/or write a PMC.
3768 pmc_value_t oldvalue;
3769 struct pmc_binding pb;
3770 struct pmc_op_pmcrw prw;
3771 struct pmc_classdep *pcd;
3772 struct pmc_op_pmcrw *pprw;
3776 if ((error = copyin(arg, &prw, sizeof(prw))) != 0)
3780 PMCDBG2(PMC,OPS,1, "rw id=%d flags=0x%x", prw.pm_pmcid,
3783 /* must have at least one flag set */
3784 if ((prw.pm_flags & (PMC_F_OLDVALUE|PMC_F_NEWVALUE)) == 0) {
3789 /* locate pmc descriptor */
3790 if ((error = pmc_find_pmc(prw.pm_pmcid, &pm)) != 0)
3793 /* Can't read a PMC that hasn't been started. */
3794 if (pm->pm_state != PMC_STATE_ALLOCATED &&
3795 pm->pm_state != PMC_STATE_STOPPED &&
3796 pm->pm_state != PMC_STATE_RUNNING) {
3801 /* writing a new value is allowed only for 'STOPPED' pmcs */
3802 if (pm->pm_state == PMC_STATE_RUNNING &&
3803 (prw.pm_flags & PMC_F_NEWVALUE)) {
3808 if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm))) {
3811 * If this PMC is attached to its owner (i.e.,
3812 * the process requesting this operation) and
3813 * is running, then attempt to get an
3814 * upto-date reading from hardware for a READ.
3815 * Writes are only allowed when the PMC is
3816 * stopped, so only update the saved value
3819 * If the PMC is not running, or is not
3820 * attached to its owner, read/write to the
3824 ri = PMC_TO_ROWINDEX(pm);
3825 pcd = pmc_ri_to_classdep(md, ri, &adjri);
3827 mtx_pool_lock_spin(pmc_mtxpool, pm);
3828 cpu = curthread->td_oncpu;
3830 if (prw.pm_flags & PMC_F_OLDVALUE) {
3831 if ((pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) &&
3832 (pm->pm_state == PMC_STATE_RUNNING))
3833 error = (*pcd->pcd_read_pmc)(cpu, adjri,
3836 oldvalue = pm->pm_gv.pm_savedvalue;
3838 if (prw.pm_flags & PMC_F_NEWVALUE)
3839 pm->pm_gv.pm_savedvalue = prw.pm_value;
3841 mtx_pool_unlock_spin(pmc_mtxpool, pm);
3843 } else { /* System mode PMCs */
3844 cpu = PMC_TO_CPU(pm);
3845 ri = PMC_TO_ROWINDEX(pm);
3846 pcd = pmc_ri_to_classdep(md, ri, &adjri);
3848 if (!pmc_cpu_is_active(cpu)) {
3853 /* move this thread to CPU 'cpu' */
3854 pmc_save_cpu_binding(&pb);
3855 pmc_select_cpu(cpu);
3858 /* save old value */
3859 if (prw.pm_flags & PMC_F_OLDVALUE)
3860 if ((error = (*pcd->pcd_read_pmc)(cpu, adjri,
3863 /* write out new value */
3864 if (prw.pm_flags & PMC_F_NEWVALUE)
3865 error = (*pcd->pcd_write_pmc)(cpu, adjri,
3869 pmc_restore_cpu_binding(&pb);
3874 pprw = (struct pmc_op_pmcrw *) arg;
3877 if (prw.pm_flags & PMC_F_NEWVALUE)
3878 PMCDBG3(PMC,OPS,2, "rw id=%d new %jx -> old %jx",
3879 ri, prw.pm_value, oldvalue);
3880 else if (prw.pm_flags & PMC_F_OLDVALUE)
3881 PMCDBG2(PMC,OPS,2, "rw id=%d -> old %jx", ri, oldvalue);
3884 /* return old value if requested */
3885 if (prw.pm_flags & PMC_F_OLDVALUE)
3886 if ((error = copyout(&oldvalue, &pprw->pm_value,
3887 sizeof(prw.pm_value))))
3895 * Set the sampling rate for a sampling mode PMC and the
3896 * initial count for a counting mode PMC.
3899 case PMC_OP_PMCSETCOUNT:
3902 struct pmc_op_pmcsetcount sc;
3906 if ((error = copyin(arg, &sc, sizeof(sc))) != 0)
3909 if ((error = pmc_find_pmc(sc.pm_pmcid, &pm)) != 0)
3912 if (pm->pm_state == PMC_STATE_RUNNING) {
3917 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
3918 pm->pm_sc.pm_reloadcount = sc.pm_count;
3920 pm->pm_sc.pm_initial = sc.pm_count;
3929 case PMC_OP_PMCSTART:
3933 struct pmc_op_simple sp;
3935 sx_assert(&pmc_sx, SX_XLOCKED);
3937 if ((error = copyin(arg, &sp, sizeof(sp))) != 0)
3940 pmcid = sp.pm_pmcid;
3942 if ((error = pmc_find_pmc(pmcid, &pm)) != 0)
3945 KASSERT(pmcid == pm->pm_id,
3946 ("[pmc,%d] pmcid %x != id %x", __LINE__,
3949 if (pm->pm_state == PMC_STATE_RUNNING) /* already running */
3951 else if (pm->pm_state != PMC_STATE_STOPPED &&
3952 pm->pm_state != PMC_STATE_ALLOCATED) {
3957 error = pmc_start(pm);
3966 case PMC_OP_PMCSTOP:
3970 struct pmc_op_simple sp;
3974 if ((error = copyin(arg, &sp, sizeof(sp))) != 0)
3977 pmcid = sp.pm_pmcid;
3980 * Mark the PMC as inactive and invoke the MD stop
3981 * routines if needed.
3984 if ((error = pmc_find_pmc(pmcid, &pm)) != 0)
3987 KASSERT(pmcid == pm->pm_id,
3988 ("[pmc,%d] pmc id %x != pmcid %x", __LINE__,
3991 if (pm->pm_state == PMC_STATE_STOPPED) /* already stopped */
3993 else if (pm->pm_state != PMC_STATE_RUNNING) {
3998 error = pmc_stop(pm);
4004 * Write a user supplied value to the log file.
4007 case PMC_OP_WRITELOG:
4009 struct pmc_op_writelog wl;
4010 struct pmc_owner *po;
4014 if ((error = copyin(arg, &wl, sizeof(wl))) != 0)
4017 if ((po = pmc_find_owner_descriptor(td->td_proc)) == NULL) {
4022 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) {
4027 error = pmclog_process_userlog(po, &wl);
4037 if (is_sx_downgraded)
4038 sx_sunlock(&pmc_sx);
4040 sx_xunlock(&pmc_sx);
4043 atomic_add_int(&pmc_stats.pm_syscall_errors, 1);
4054 * Mark the thread as needing callchain capture and post an AST. The
4055 * actual callchain capture will be done in a context where it is safe
4056 * to take page faults.
4060 pmc_post_callchain_callback(void)
4067 * If there is multiple PMCs for the same interrupt ignore new post
4069 if (td->td_pflags & TDP_CALLCHAIN)
4073 * Mark this thread as needing callchain capture.
4074 * `td->td_pflags' will be safe to touch because this thread
4075 * was in user space when it was interrupted.
4077 td->td_pflags |= TDP_CALLCHAIN;
4080 * Don't let this thread migrate between CPUs until callchain
4081 * capture completes.
4089 * Interrupt processing.
4091 * Find a free slot in the per-cpu array of samples and capture the
4092 * current callchain there. If a sample was successfully added, a bit
4093 * is set in mask 'pmc_cpumask' denoting that the DO_SAMPLES hook
4094 * needs to be invoked from the clock handler.
4096 * This function is meant to be called from an NMI handler. It cannot
4097 * use any of the locking primitives supplied by the OS.
4101 pmc_process_interrupt(int cpu, int ring, struct pmc *pm, struct trapframe *tf,
4104 int error, callchaindepth;
4106 struct pmc_sample *ps;
4107 struct pmc_samplebuffer *psb;
4112 * Allocate space for a sample buffer.
4114 psb = pmc_pcpu[cpu]->pc_sb[ring];
4117 if (ps->ps_nsamples) { /* in use, reader hasn't caught up */
4118 CPU_SET_ATOMIC(cpu, &pm->pm_stalled);
4119 atomic_add_int(&pmc_stats.pm_intr_bufferfull, 1);
4120 PMCDBG6(SAM,INT,1,"(spc) cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d",
4121 cpu, pm, (void *) tf, inuserspace,
4122 (int) (psb->ps_write - psb->ps_samples),
4123 (int) (psb->ps_read - psb->ps_samples));
4130 /* Fill in entry. */
4131 PMCDBG6(SAM,INT,1,"cpu=%d pm=%p tf=%p um=%d wr=%d rd=%d", cpu, pm,
4132 (void *) tf, inuserspace,
4133 (int) (psb->ps_write - psb->ps_samples),
4134 (int) (psb->ps_read - psb->ps_samples));
4136 KASSERT(pm->pm_runcount >= 0,
4137 ("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm,
4140 atomic_add_rel_int(&pm->pm_runcount, 1); /* hold onto PMC */
4143 if ((td = curthread) && td->td_proc)
4144 ps->ps_pid = td->td_proc->p_pid;
4149 ps->ps_flags = inuserspace ? PMC_CC_F_USERSPACE : 0;
4151 callchaindepth = (pm->pm_flags & PMC_F_CALLCHAIN) ?
4152 pmc_callchaindepth : 1;
4154 if (callchaindepth == 1)
4155 ps->ps_pc[0] = PMC_TRAPFRAME_TO_PC(tf);
4158 * Kernel stack traversals can be done immediately,
4159 * while we defer to an AST for user space traversals.
4163 pmc_save_kernel_callchain(ps->ps_pc,
4164 callchaindepth, tf);
4166 pmc_post_callchain_callback();
4167 callchaindepth = PMC_SAMPLE_INUSE;
4171 ps->ps_nsamples = callchaindepth; /* mark entry as in use */
4173 /* increment write pointer, modulo ring buffer size */
4175 if (ps == psb->ps_fence)
4176 psb->ps_write = psb->ps_samples;
4181 /* mark CPU as needing processing */
4182 if (callchaindepth != PMC_SAMPLE_INUSE)
4183 CPU_SET_ATOMIC(cpu, &pmc_cpumask);
4189 * Capture a user call chain. This function will be called from ast()
4190 * before control returns to userland and before the process gets
4195 pmc_capture_user_callchain(int cpu, int ring, struct trapframe *tf)
4199 struct pmc_sample *ps, *ps_end;
4200 struct pmc_samplebuffer *psb;
4206 psb = pmc_pcpu[cpu]->pc_sb[ring];
4209 KASSERT(td->td_pflags & TDP_CALLCHAIN,
4210 ("[pmc,%d] Retrieving callchain for thread that doesn't want it",
4219 * Iterate through all deferred callchain requests.
4220 * Walk from the current read pointer to the current
4225 ps_end = psb->ps_write;
4228 if ((ps->ps_pmc == NULL) ||
4229 (ps->ps_pmc->pm_state != PMC_STATE_RUNNING))
4232 if (ps->ps_nsamples != PMC_SAMPLE_INUSE)
4234 if (ps->ps_td != td)
4237 KASSERT(ps->ps_cpu == cpu,
4238 ("[pmc,%d] cpu mismatch ps_cpu=%d pcpu=%d", __LINE__,
4239 ps->ps_cpu, PCPU_GET(cpuid)));
4243 KASSERT(pm->pm_flags & PMC_F_CALLCHAIN,
4244 ("[pmc,%d] Retrieving callchain for PMC that doesn't "
4245 "want it", __LINE__));
4247 KASSERT(pm->pm_runcount > 0,
4248 ("[pmc,%d] runcount %d", __LINE__, pm->pm_runcount));
4251 * Retrieve the callchain and mark the sample buffer
4252 * as 'processable' by the timer tick sweep code.
4254 ps->ps_nsamples = pmc_save_user_callchain(ps->ps_pc,
4255 pmc_callchaindepth, tf);
4262 /* increment the pointer, modulo sample ring size */
4263 if (++ps == psb->ps_fence)
4264 ps = psb->ps_samples;
4265 } while (ps != ps_end);
4268 KASSERT(ncallchains > 0 || nfree > 0,
4269 ("[pmc,%d] cpu %d didn't find a sample to collect", __LINE__,
4273 KASSERT(td->td_pinned == 1,
4274 ("[pmc,%d] invalid td_pinned value", __LINE__));
4275 sched_unpin(); /* Can migrate safely now. */
4277 /* mark CPU as needing processing */
4278 CPU_SET_ATOMIC(cpu, &pmc_cpumask);
4284 * Process saved PC samples.
4288 pmc_process_samples(int cpu, int ring)
4293 struct pmc_owner *po;
4294 struct pmc_sample *ps;
4295 struct pmc_classdep *pcd;
4296 struct pmc_samplebuffer *psb;
4298 KASSERT(PCPU_GET(cpuid) == cpu,
4299 ("[pmc,%d] not on the correct CPU pcpu=%d cpu=%d", __LINE__,
4300 PCPU_GET(cpuid), cpu));
4302 psb = pmc_pcpu[cpu]->pc_sb[ring];
4304 for (n = 0; n < pmc_nsamples; n++) { /* bound on #iterations */
4307 if (ps->ps_nsamples == PMC_SAMPLE_FREE)
4312 KASSERT(pm->pm_runcount > 0,
4313 ("[pmc,%d] pm=%p runcount %d", __LINE__, (void *) pm,
4318 KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)),
4319 ("[pmc,%d] pmc=%p non-sampling mode=%d", __LINE__,
4320 pm, PMC_TO_MODE(pm)));
4322 /* Ignore PMCs that have been switched off */
4323 if (pm->pm_state != PMC_STATE_RUNNING)
4326 /* If there is a pending AST wait for completion */
4327 if (ps->ps_nsamples == PMC_SAMPLE_INUSE) {
4328 /* Need a rescan at a later time. */
4329 CPU_SET_ATOMIC(cpu, &pmc_cpumask);
4333 PMCDBG6(SAM,OPS,1,"cpu=%d pm=%p n=%d fl=%x wr=%d rd=%d", cpu,
4334 pm, ps->ps_nsamples, ps->ps_flags,
4335 (int) (psb->ps_write - psb->ps_samples),
4336 (int) (psb->ps_read - psb->ps_samples));
4339 * If this is a process-mode PMC that is attached to
4340 * its owner, and if the PC is in user mode, update
4341 * profiling statistics like timer-based profiling
4344 if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) {
4345 if (ps->ps_flags & PMC_CC_F_USERSPACE) {
4346 td = FIRST_THREAD_IN_PROC(po->po_owner);
4347 addupc_intr(td, ps->ps_pc[0], 1);
4353 * Otherwise, this is either a sampling mode PMC that
4354 * is attached to a different process than its owner,
4355 * or a system-wide sampling PMC. Dispatch a log
4356 * entry to the PMC's owner process.
4358 pmclog_process_callchain(pm, ps);
4361 ps->ps_nsamples = 0; /* mark entry as free */
4362 atomic_subtract_rel_int(&pm->pm_runcount, 1);
4364 /* increment read pointer, modulo sample size */
4365 if (++ps == psb->ps_fence)
4366 psb->ps_read = psb->ps_samples;
4371 atomic_add_int(&pmc_stats.pm_log_sweeps, 1);
4373 /* Do not re-enable stalled PMCs if we failed to process any samples */
4378 * Restart any stalled sampling PMCs on this CPU.
4380 * If the NMI handler sets the pm_stalled field of a PMC after
4381 * the check below, we'll end up processing the stalled PMC at
4382 * the next hardclock tick.
4384 for (n = 0; n < md->pmd_npmc; n++) {
4385 pcd = pmc_ri_to_classdep(md, n, &adjri);
4386 KASSERT(pcd != NULL,
4387 ("[pmc,%d] null pcd ri=%d", __LINE__, n));
4388 (void) (*pcd->pcd_get_config)(cpu,adjri,&pm);
4390 if (pm == NULL || /* !cfg'ed */
4391 pm->pm_state != PMC_STATE_RUNNING || /* !active */
4392 !PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) || /* !sampling */
4393 !CPU_ISSET(cpu, &pm->pm_cpustate) || /* !desired */
4394 !CPU_ISSET(cpu, &pm->pm_stalled)) /* !stalled */
4397 CPU_CLR_ATOMIC(cpu, &pm->pm_stalled);
4398 (*pcd->pcd_start_pmc)(cpu, adjri);
4407 * Handle a process exit.
4409 * Remove this process from all hash tables. If this process
4410 * owned any PMCs, turn off those PMCs and deallocate them,
4411 * removing any associations with target processes.
4413 * This function will be called by the last 'thread' of a
4416 * XXX This eventhandler gets called early in the exit process.
4417 * Consider using a 'hook' invocation from thread_exit() or equivalent
4418 * spot. Another negative is that kse_exit doesn't seem to call
4424 pmc_process_exit(void *arg __unused, struct proc *p)
4429 int is_using_hwpmcs;
4430 struct pmc_owner *po;
4431 struct pmc_process *pp;
4432 struct pmc_classdep *pcd;
4433 pmc_value_t newvalue, tmp;
4436 is_using_hwpmcs = p->p_flag & P_HWPMC;
4440 * Log a sysexit event to all SS PMC owners.
4442 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
4443 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
4444 pmclog_process_sysexit(po, p->p_pid);
4446 if (!is_using_hwpmcs)
4450 PMCDBG3(PRC,EXT,1,"process-exit proc=%p (%d, %s)", p, p->p_pid,
4454 * Since this code is invoked by the last thread in an exiting
4455 * process, we would have context switched IN at some prior
4456 * point. However, with PREEMPTION, kernel mode context
4457 * switches may happen any time, so we want to disable a
4458 * context switch OUT till we get any PMCs targeting this
4459 * process off the hardware.
4461 * We also need to atomically remove this process'
4462 * entry from our target process hash table, using
4465 PMCDBG3(PRC,EXT,1, "process-exit proc=%p (%d, %s)", p, p->p_pid,
4468 critical_enter(); /* no preemption */
4470 cpu = curthread->td_oncpu;
4472 if ((pp = pmc_find_process_descriptor(p,
4473 PMC_FLAG_REMOVE)) != NULL) {
4476 "process-exit proc=%p pmc-process=%p", p, pp);
4479 * The exiting process could the target of
4480 * some PMCs which will be running on
4481 * currently executing CPU.
4483 * We need to turn these PMCs off like we
4484 * would do at context switch OUT time.
4486 for (ri = 0; ri < md->pmd_npmc; ri++) {
4489 * Pick up the pmc pointer from hardware
4490 * state similar to the CSW_OUT code.
4494 pcd = pmc_ri_to_classdep(md, ri, &adjri);
4496 (void) (*pcd->pcd_get_config)(cpu, adjri, &pm);
4498 PMCDBG2(PRC,EXT,2, "ri=%d pm=%p", ri, pm);
4501 !PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)))
4504 PMCDBG4(PRC,EXT,2, "ppmcs[%d]=%p pm=%p "
4505 "state=%d", ri, pp->pp_pmcs[ri].pp_pmc,
4508 KASSERT(PMC_TO_ROWINDEX(pm) == ri,
4509 ("[pmc,%d] ri mismatch pmc(%d) ri(%d)",
4510 __LINE__, PMC_TO_ROWINDEX(pm), ri));
4512 KASSERT(pm == pp->pp_pmcs[ri].pp_pmc,
4513 ("[pmc,%d] pm %p != pp_pmcs[%d] %p",
4514 __LINE__, pm, ri, pp->pp_pmcs[ri].pp_pmc));
4516 KASSERT(pm->pm_runcount > 0,
4517 ("[pmc,%d] bad runcount ri %d rc %d",
4518 __LINE__, ri, pm->pm_runcount));
4521 * Change desired state, and then stop if not
4522 * stalled. This two-step dance should avoid
4523 * race conditions where an interrupt re-enables
4524 * the PMC after this code has already checked
4525 * the pm_stalled flag.
4527 if (CPU_ISSET(cpu, &pm->pm_cpustate)) {
4528 CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate);
4529 if (!CPU_ISSET(cpu, &pm->pm_stalled)) {
4530 (void) pcd->pcd_stop_pmc(cpu, adjri);
4531 pcd->pcd_read_pmc(cpu, adjri,
4534 PMC_PCPU_SAVED(cpu,ri);
4536 mtx_pool_lock_spin(pmc_mtxpool, pm);
4537 pm->pm_gv.pm_savedvalue += tmp;
4538 pp->pp_pmcs[ri].pp_pmcval += tmp;
4539 mtx_pool_unlock_spin(pmc_mtxpool, pm);
4543 atomic_subtract_rel_int(&pm->pm_runcount,1);
4545 KASSERT((int) pm->pm_runcount >= 0,
4546 ("[pmc,%d] runcount is %d", __LINE__, ri));
4548 (void) pcd->pcd_config_pmc(cpu, adjri, NULL);
4552 * Inform the MD layer of this pseudo "context switch
4555 (void) md->pmd_switch_out(pmc_pcpu[cpu], pp);
4557 critical_exit(); /* ok to be pre-empted now */
4560 * Unlink this process from the PMCs that are
4561 * targeting it. This will send a signal to
4562 * all PMC owner's whose PMCs are orphaned.
4564 * Log PMC value at exit time if requested.
4566 for (ri = 0; ri < md->pmd_npmc; ri++)
4567 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) {
4568 if (pm->pm_flags & PMC_F_NEEDS_LOGFILE &&
4569 PMC_IS_COUNTING_MODE(PMC_TO_MODE(pm)))
4570 pmclog_process_procexit(pm, pp);
4571 pmc_unlink_target_process(pm, pp);
4576 critical_exit(); /* pp == NULL */
4580 * If the process owned PMCs, free them up and free up
4583 if ((po = pmc_find_owner_descriptor(p)) != NULL) {
4584 pmc_remove_owner(po);
4585 pmc_destroy_owner_descriptor(po);
4588 sx_xunlock(&pmc_sx);
4592 * Handle a process fork.
4594 * If the parent process 'p1' is under HWPMC monitoring, then copy
4595 * over any attached PMCs that have 'do_descendants' semantics.
4599 pmc_process_fork(void *arg __unused, struct proc *p1, struct proc *newproc,
4602 int is_using_hwpmcs;
4604 uint32_t do_descendants;
4606 struct pmc_owner *po;
4607 struct pmc_process *ppnew, *ppold;
4609 (void) flags; /* unused parameter */
4612 is_using_hwpmcs = p1->p_flag & P_HWPMC;
4616 * If there are system-wide sampling PMCs active, we need to
4617 * log all fork events to their owner's logs.
4620 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
4621 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
4622 pmclog_process_procfork(po, p1->p_pid, newproc->p_pid);
4624 if (!is_using_hwpmcs)
4628 PMCDBG4(PMC,FRK,1, "process-fork proc=%p (%d, %s) -> %p", p1,
4629 p1->p_pid, p1->p_comm, newproc);
4632 * If the parent process (curthread->td_proc) is a
4633 * target of any PMCs, look for PMCs that are to be
4634 * inherited, and link these into the new process
4637 if ((ppold = pmc_find_process_descriptor(curthread->td_proc,
4638 PMC_FLAG_NONE)) == NULL)
4639 goto done; /* nothing to do */
4642 for (ri = 0; ri < md->pmd_npmc; ri++)
4643 if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL)
4644 do_descendants |= pm->pm_flags & PMC_F_DESCENDANTS;
4645 if (do_descendants == 0) /* nothing to do */
4648 /* allocate a descriptor for the new process */
4649 if ((ppnew = pmc_find_process_descriptor(newproc,
4650 PMC_FLAG_ALLOCATE)) == NULL)
4654 * Run through all PMCs that were targeting the old process
4655 * and which specified F_DESCENDANTS and attach them to the
4658 * Log the fork event to all owners of PMCs attached to this
4659 * process, if not already logged.
4661 for (ri = 0; ri < md->pmd_npmc; ri++)
4662 if ((pm = ppold->pp_pmcs[ri].pp_pmc) != NULL &&
4663 (pm->pm_flags & PMC_F_DESCENDANTS)) {
4664 pmc_link_target_process(pm, ppnew);
4666 if (po->po_sscount == 0 &&
4667 po->po_flags & PMC_PO_OWNS_LOGFILE)
4668 pmclog_process_procfork(po, p1->p_pid,
4673 * Now mark the new process as being tracked by this driver.
4676 newproc->p_flag |= P_HWPMC;
4677 PROC_UNLOCK(newproc);
4680 sx_xunlock(&pmc_sx);
4684 pmc_kld_load(void *arg __unused, linker_file_t lf)
4686 struct pmc_owner *po;
4691 * Notify owners of system sampling PMCs about KLD operations.
4693 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
4694 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
4695 pmclog_process_map_in(po, (pid_t) -1,
4696 (uintfptr_t) lf->address, lf->filename);
4699 * TODO: Notify owners of (all) process-sampling PMCs too.
4702 sx_sunlock(&pmc_sx);
4706 pmc_kld_unload(void *arg __unused, const char *filename __unused,
4707 caddr_t address, size_t size)
4709 struct pmc_owner *po;
4713 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
4714 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
4715 pmclog_process_map_out(po, (pid_t) -1,
4716 (uintfptr_t) address, (uintfptr_t) address + size);
4719 * TODO: Notify owners of process-sampling PMCs.
4722 sx_sunlock(&pmc_sx);
4729 pmc_name_of_pmcclass(enum pmc_class class)
4734 #define __PMC_CLASS(S,V,D) \
4735 case PMC_CLASS_##S: \
4739 return ("<unknown>");
4744 * Base class initializer: allocate structure and set default classes.
4747 pmc_mdep_alloc(int nclasses)
4749 struct pmc_mdep *md;
4752 /* SOFT + md classes */
4754 md = malloc(sizeof(struct pmc_mdep) + n *
4755 sizeof(struct pmc_classdep), M_PMC, M_WAITOK|M_ZERO);
4758 /* Add base class. */
4759 pmc_soft_initialize(md);
4764 pmc_mdep_free(struct pmc_mdep *md)
4766 pmc_soft_finalize(md);
4771 generic_switch_in(struct pmc_cpu *pc, struct pmc_process *pp)
4773 (void) pc; (void) pp;
4779 generic_switch_out(struct pmc_cpu *pc, struct pmc_process *pp)
4781 (void) pc; (void) pp;
4786 static struct pmc_mdep *
4787 pmc_generic_cpu_initialize(void)
4789 struct pmc_mdep *md;
4791 md = pmc_mdep_alloc(0);
4793 md->pmd_cputype = PMC_CPU_GENERIC;
4795 md->pmd_pcpu_init = NULL;
4796 md->pmd_pcpu_fini = NULL;
4797 md->pmd_switch_in = generic_switch_in;
4798 md->pmd_switch_out = generic_switch_out;
4804 pmc_generic_cpu_finalize(struct pmc_mdep *md)
4811 pmc_initialize(void)
4813 int c, cpu, error, n, ri;
4814 unsigned int maxcpu;
4815 struct pmc_binding pb;
4816 struct pmc_sample *ps;
4817 struct pmc_classdep *pcd;
4818 struct pmc_samplebuffer *sb;
4824 /* parse debug flags first */
4825 if (TUNABLE_STR_FETCH(PMC_SYSCTL_NAME_PREFIX "debugflags",
4826 pmc_debugstr, sizeof(pmc_debugstr)))
4827 pmc_debugflags_parse(pmc_debugstr,
4828 pmc_debugstr+strlen(pmc_debugstr));
4831 PMCDBG1(MOD,INI,0, "PMC Initialize (version %x)", PMC_VERSION);
4833 /* check kernel version */
4834 if (pmc_kernel_version != PMC_VERSION) {
4835 if (pmc_kernel_version == 0)
4836 printf("hwpmc: this kernel has not been compiled with "
4837 "'options HWPMC_HOOKS'.\n");
4839 printf("hwpmc: kernel version (0x%x) does not match "
4840 "module version (0x%x).\n", pmc_kernel_version,
4842 return EPROGMISMATCH;
4846 * check sysctl parameters
4849 if (pmc_hashsize <= 0) {
4850 (void) printf("hwpmc: tunable \"hashsize\"=%d must be "
4851 "greater than zero.\n", pmc_hashsize);
4852 pmc_hashsize = PMC_HASH_SIZE;
4855 if (pmc_nsamples <= 0 || pmc_nsamples > 65535) {
4856 (void) printf("hwpmc: tunable \"nsamples\"=%d out of "
4857 "range.\n", pmc_nsamples);
4858 pmc_nsamples = PMC_NSAMPLES;
4861 if (pmc_callchaindepth <= 0 ||
4862 pmc_callchaindepth > PMC_CALLCHAIN_DEPTH_MAX) {
4863 (void) printf("hwpmc: tunable \"callchaindepth\"=%d out of "
4864 "range - using %d.\n", pmc_callchaindepth,
4865 PMC_CALLCHAIN_DEPTH_MAX);
4866 pmc_callchaindepth = PMC_CALLCHAIN_DEPTH_MAX;
4869 md = pmc_md_initialize();
4871 /* Default to generic CPU. */
4872 md = pmc_generic_cpu_initialize();
4877 KASSERT(md->pmd_nclass >= 1 && md->pmd_npmc >= 1,
4878 ("[pmc,%d] no classes or pmcs", __LINE__));
4880 /* Compute the map from row-indices to classdep pointers. */
4881 pmc_rowindex_to_classdep = malloc(sizeof(struct pmc_classdep *) *
4882 md->pmd_npmc, M_PMC, M_WAITOK|M_ZERO);
4884 for (n = 0; n < md->pmd_npmc; n++)
4885 pmc_rowindex_to_classdep[n] = NULL;
4886 for (ri = c = 0; c < md->pmd_nclass; c++) {
4887 pcd = &md->pmd_classdep[c];
4888 for (n = 0; n < pcd->pcd_num; n++, ri++)
4889 pmc_rowindex_to_classdep[ri] = pcd;
4892 KASSERT(ri == md->pmd_npmc,
4893 ("[pmc,%d] npmc miscomputed: ri=%d, md->npmc=%d", __LINE__,
4896 maxcpu = pmc_cpu_max();
4898 /* allocate space for the per-cpu array */
4899 pmc_pcpu = malloc(maxcpu * sizeof(struct pmc_cpu *), M_PMC,
4902 /* per-cpu 'saved values' for managing process-mode PMCs */
4903 pmc_pcpu_saved = malloc(sizeof(pmc_value_t) * maxcpu * md->pmd_npmc,
4906 /* Perform CPU-dependent initialization. */
4907 pmc_save_cpu_binding(&pb);
4909 for (cpu = 0; error == 0 && cpu < maxcpu; cpu++) {
4910 if (!pmc_cpu_is_active(cpu))
4912 pmc_select_cpu(cpu);
4913 pmc_pcpu[cpu] = malloc(sizeof(struct pmc_cpu) +
4914 md->pmd_npmc * sizeof(struct pmc_hw *), M_PMC,
4916 if (md->pmd_pcpu_init)
4917 error = md->pmd_pcpu_init(md, cpu);
4918 for (n = 0; error == 0 && n < md->pmd_nclass; n++)
4919 error = md->pmd_classdep[n].pcd_pcpu_init(md, cpu);
4921 pmc_restore_cpu_binding(&pb);
4926 /* allocate space for the sample array */
4927 for (cpu = 0; cpu < maxcpu; cpu++) {
4928 if (!pmc_cpu_is_active(cpu))
4931 sb = malloc(sizeof(struct pmc_samplebuffer) +
4932 pmc_nsamples * sizeof(struct pmc_sample), M_PMC,
4934 sb->ps_read = sb->ps_write = sb->ps_samples;
4935 sb->ps_fence = sb->ps_samples + pmc_nsamples;
4937 KASSERT(pmc_pcpu[cpu] != NULL,
4938 ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu));
4940 sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples *
4941 sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO);
4943 for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++)
4944 ps->ps_pc = sb->ps_callchains +
4945 (n * pmc_callchaindepth);
4947 pmc_pcpu[cpu]->pc_sb[PMC_HR] = sb;
4949 sb = malloc(sizeof(struct pmc_samplebuffer) +
4950 pmc_nsamples * sizeof(struct pmc_sample), M_PMC,
4952 sb->ps_read = sb->ps_write = sb->ps_samples;
4953 sb->ps_fence = sb->ps_samples + pmc_nsamples;
4955 KASSERT(pmc_pcpu[cpu] != NULL,
4956 ("[pmc,%d] cpu=%d Null per-cpu data", __LINE__, cpu));
4958 sb->ps_callchains = malloc(pmc_callchaindepth * pmc_nsamples *
4959 sizeof(uintptr_t), M_PMC, M_WAITOK|M_ZERO);
4961 for (n = 0, ps = sb->ps_samples; n < pmc_nsamples; n++, ps++)
4962 ps->ps_pc = sb->ps_callchains +
4963 (n * pmc_callchaindepth);
4965 pmc_pcpu[cpu]->pc_sb[PMC_SR] = sb;
4968 /* allocate space for the row disposition array */
4969 pmc_pmcdisp = malloc(sizeof(enum pmc_mode) * md->pmd_npmc,
4970 M_PMC, M_WAITOK|M_ZERO);
4972 /* mark all PMCs as available */
4973 for (n = 0; n < (int) md->pmd_npmc; n++)
4974 PMC_MARK_ROW_FREE(n);
4976 /* allocate thread hash tables */
4977 pmc_ownerhash = hashinit(pmc_hashsize, M_PMC,
4978 &pmc_ownerhashmask);
4980 pmc_processhash = hashinit(pmc_hashsize, M_PMC,
4981 &pmc_processhashmask);
4982 mtx_init(&pmc_processhash_mtx, "pmc-process-hash", "pmc-leaf",
4985 LIST_INIT(&pmc_ss_owners);
4988 /* allocate a pool of spin mutexes */
4989 pmc_mtxpool = mtx_pool_create("pmc-leaf", pmc_mtxpool_size,
4992 PMCDBG4(MOD,INI,1, "pmc_ownerhash=%p, mask=0x%lx "
4993 "targethash=%p mask=0x%lx", pmc_ownerhash, pmc_ownerhashmask,
4994 pmc_processhash, pmc_processhashmask);
4996 /* register process {exit,fork,exec} handlers */
4997 pmc_exit_tag = EVENTHANDLER_REGISTER(process_exit,
4998 pmc_process_exit, NULL, EVENTHANDLER_PRI_ANY);
4999 pmc_fork_tag = EVENTHANDLER_REGISTER(process_fork,
5000 pmc_process_fork, NULL, EVENTHANDLER_PRI_ANY);
5002 /* register kld event handlers */
5003 pmc_kld_load_tag = EVENTHANDLER_REGISTER(kld_load, pmc_kld_load,
5004 NULL, EVENTHANDLER_PRI_ANY);
5005 pmc_kld_unload_tag = EVENTHANDLER_REGISTER(kld_unload, pmc_kld_unload,
5006 NULL, EVENTHANDLER_PRI_ANY);
5008 /* initialize logging */
5009 pmclog_initialize();
5011 /* set hook functions */
5012 pmc_intr = md->pmd_intr;
5013 pmc_hook = pmc_hook_handler;
5016 printf(PMC_MODULE_NAME ":");
5017 for (n = 0; n < (int) md->pmd_nclass; n++) {
5018 pcd = &md->pmd_classdep[n];
5019 printf(" %s/%d/%d/0x%b",
5020 pmc_name_of_pmcclass(pcd->pcd_class),
5025 "\1INT\2USR\3SYS\4EDG\5THR"
5026 "\6REA\7WRI\10INV\11QUA\12PRC"
5035 /* prepare to be unloaded */
5040 unsigned int maxcpu;
5041 struct pmc_ownerhash *ph;
5042 struct pmc_owner *po, *tmp;
5043 struct pmc_binding pb;
5045 struct pmc_processhash *prh;
5048 PMCDBG0(MOD,INI,0, "cleanup");
5050 /* switch off sampling */
5051 CPU_ZERO(&pmc_cpumask);
5055 if (pmc_hook == NULL) { /* being unloaded already */
5056 sx_xunlock(&pmc_sx);
5060 pmc_hook = NULL; /* prevent new threads from entering module */
5062 /* deregister event handlers */
5063 EVENTHANDLER_DEREGISTER(process_fork, pmc_fork_tag);
5064 EVENTHANDLER_DEREGISTER(process_exit, pmc_exit_tag);
5065 EVENTHANDLER_DEREGISTER(kld_load, pmc_kld_load_tag);
5066 EVENTHANDLER_DEREGISTER(kld_unload, pmc_kld_unload_tag);
5068 /* send SIGBUS to all owner threads, free up allocations */
5070 for (ph = pmc_ownerhash;
5071 ph <= &pmc_ownerhash[pmc_ownerhashmask];
5073 LIST_FOREACH_SAFE(po, ph, po_next, tmp) {
5074 pmc_remove_owner(po);
5076 /* send SIGBUS to owner processes */
5077 PMCDBG3(MOD,INI,2, "cleanup signal proc=%p "
5078 "(%d, %s)", po->po_owner,
5079 po->po_owner->p_pid,
5080 po->po_owner->p_comm);
5082 PROC_LOCK(po->po_owner);
5083 kern_psignal(po->po_owner, SIGBUS);
5084 PROC_UNLOCK(po->po_owner);
5086 pmc_destroy_owner_descriptor(po);
5090 /* reclaim allocated data structures */
5092 mtx_pool_destroy(&pmc_mtxpool);
5094 mtx_destroy(&pmc_processhash_mtx);
5095 if (pmc_processhash) {
5097 struct pmc_process *pp;
5099 PMCDBG0(MOD,INI,3, "destroy process hash");
5100 for (prh = pmc_processhash;
5101 prh <= &pmc_processhash[pmc_processhashmask];
5103 LIST_FOREACH(pp, prh, pp_next)
5104 PMCDBG1(MOD,INI,3, "pid=%d", pp->pp_proc->p_pid);
5107 hashdestroy(pmc_processhash, M_PMC, pmc_processhashmask);
5108 pmc_processhash = NULL;
5111 if (pmc_ownerhash) {
5112 PMCDBG0(MOD,INI,3, "destroy owner hash");
5113 hashdestroy(pmc_ownerhash, M_PMC, pmc_ownerhashmask);
5114 pmc_ownerhash = NULL;
5117 KASSERT(LIST_EMPTY(&pmc_ss_owners),
5118 ("[pmc,%d] Global SS owner list not empty", __LINE__));
5119 KASSERT(pmc_ss_count == 0,
5120 ("[pmc,%d] Global SS count not empty", __LINE__));
5122 /* do processor and pmc-class dependent cleanup */
5123 maxcpu = pmc_cpu_max();
5125 PMCDBG0(MOD,INI,3, "md cleanup");
5127 pmc_save_cpu_binding(&pb);
5128 for (cpu = 0; cpu < maxcpu; cpu++) {
5129 PMCDBG2(MOD,INI,1,"pmc-cleanup cpu=%d pcs=%p",
5130 cpu, pmc_pcpu[cpu]);
5131 if (!pmc_cpu_is_active(cpu) || pmc_pcpu[cpu] == NULL)
5133 pmc_select_cpu(cpu);
5134 for (c = 0; c < md->pmd_nclass; c++)
5135 md->pmd_classdep[c].pcd_pcpu_fini(md, cpu);
5136 if (md->pmd_pcpu_fini)
5137 md->pmd_pcpu_fini(md, cpu);
5140 if (md->pmd_cputype == PMC_CPU_GENERIC)
5141 pmc_generic_cpu_finalize(md);
5143 pmc_md_finalize(md);
5147 pmc_restore_cpu_binding(&pb);
5150 /* Free per-cpu descriptors. */
5151 for (cpu = 0; cpu < maxcpu; cpu++) {
5152 if (!pmc_cpu_is_active(cpu))
5154 KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_HR] != NULL,
5155 ("[pmc,%d] Null hw cpu sample buffer cpu=%d", __LINE__,
5157 KASSERT(pmc_pcpu[cpu]->pc_sb[PMC_SR] != NULL,
5158 ("[pmc,%d] Null sw cpu sample buffer cpu=%d", __LINE__,
5160 free(pmc_pcpu[cpu]->pc_sb[PMC_HR]->ps_callchains, M_PMC);
5161 free(pmc_pcpu[cpu]->pc_sb[PMC_HR], M_PMC);
5162 free(pmc_pcpu[cpu]->pc_sb[PMC_SR]->ps_callchains, M_PMC);
5163 free(pmc_pcpu[cpu]->pc_sb[PMC_SR], M_PMC);
5164 free(pmc_pcpu[cpu], M_PMC);
5167 free(pmc_pcpu, M_PMC);
5170 free(pmc_pcpu_saved, M_PMC);
5171 pmc_pcpu_saved = NULL;
5174 free(pmc_pmcdisp, M_PMC);
5178 if (pmc_rowindex_to_classdep) {
5179 free(pmc_rowindex_to_classdep, M_PMC);
5180 pmc_rowindex_to_classdep = NULL;
5185 sx_xunlock(&pmc_sx); /* we are done */
5189 * The function called at load/unload.
5193 load (struct module *module __unused, int cmd, void *arg __unused)
5201 /* initialize the subsystem */
5202 error = pmc_initialize();
5205 PMCDBG2(MOD,INI,1, "syscall=%d maxcpu=%d",
5206 pmc_syscall_num, pmc_cpu_max());
5213 PMCDBG0(MOD,INI,1, "unloaded");
5217 error = EINVAL; /* XXX should panic(9) */
5225 MALLOC_DEFINE(M_PMC, "pmc", "Memory space for the PMC module");