2 * Copyright (c) 2003-2008 Joseph Koshy
3 * Copyright (c) 2007 The FreeBSD Foundation
6 * Portions of this software were developed by A. Joseph Koshy under
7 * sponsorship from the FreeBSD Foundation and Google, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/eventhandler.h>
38 #include <sys/kernel.h>
39 #include <sys/kthread.h>
40 #include <sys/limits.h>
42 #include <sys/malloc.h>
43 #include <sys/module.h>
44 #include <sys/mount.h>
45 #include <sys/mutex.h>
47 #include <sys/pmckern.h>
48 #include <sys/pmclog.h>
51 #include <sys/queue.h>
52 #include <sys/resourcevar.h>
53 #include <sys/rwlock.h>
54 #include <sys/sched.h>
55 #include <sys/signalvar.h>
58 #include <sys/sysctl.h>
59 #include <sys/sysent.h>
60 #include <sys/systm.h>
61 #include <sys/vnode.h>
63 #include <sys/linker.h> /* needs to be after <sys/malloc.h> */
65 #include <machine/atomic.h>
66 #include <machine/md_var.h>
69 #include <vm/vm_extern.h>
71 #include <vm/vm_map.h>
72 #include <vm/vm_object.h>
74 #include "hwpmc_soft.h"
81 PMC_FLAG_NONE = 0x00, /* do nothing */
82 PMC_FLAG_REMOVE = 0x01, /* atomically remove entry from hash */
83 PMC_FLAG_ALLOCATE = 0x02, /* add entry to hash if not found */
87 * The offset in sysent where the syscall is allocated.
90 static int pmc_syscall_num = NO_SYSCALL;
91 struct pmc_cpu **pmc_pcpu; /* per-cpu state */
92 pmc_value_t *pmc_pcpu_saved; /* saved PMC values: CSW handling */
94 #define PMC_PCPU_SAVED(C,R) pmc_pcpu_saved[(R) + md->pmd_npmc*(C)]
96 struct mtx_pool *pmc_mtxpool;
97 static int *pmc_pmcdisp; /* PMC row dispositions */
99 #define PMC_ROW_DISP_IS_FREE(R) (pmc_pmcdisp[(R)] == 0)
100 #define PMC_ROW_DISP_IS_THREAD(R) (pmc_pmcdisp[(R)] > 0)
101 #define PMC_ROW_DISP_IS_STANDALONE(R) (pmc_pmcdisp[(R)] < 0)
103 #define PMC_MARK_ROW_FREE(R) do { \
104 pmc_pmcdisp[(R)] = 0; \
107 #define PMC_MARK_ROW_STANDALONE(R) do { \
108 KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \
110 atomic_add_int(&pmc_pmcdisp[(R)], -1); \
111 KASSERT(pmc_pmcdisp[(R)] >= (-pmc_cpu_max_active()), \
112 ("[pmc,%d] row disposition error", __LINE__)); \
115 #define PMC_UNMARK_ROW_STANDALONE(R) do { \
116 atomic_add_int(&pmc_pmcdisp[(R)], 1); \
117 KASSERT(pmc_pmcdisp[(R)] <= 0, ("[pmc,%d] row disposition error", \
121 #define PMC_MARK_ROW_THREAD(R) do { \
122 KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \
124 atomic_add_int(&pmc_pmcdisp[(R)], 1); \
127 #define PMC_UNMARK_ROW_THREAD(R) do { \
128 atomic_add_int(&pmc_pmcdisp[(R)], -1); \
129 KASSERT(pmc_pmcdisp[(R)] >= 0, ("[pmc,%d] row disposition error", \
134 /* various event handlers */
135 static eventhandler_tag pmc_exit_tag, pmc_fork_tag, pmc_kld_load_tag,
138 /* Module statistics */
139 struct pmc_op_getdriverstats pmc_stats;
141 /* Machine/processor dependent operations */
142 static struct pmc_mdep *md;
145 * Hash tables mapping owner processes and target threads to PMCs.
148 struct mtx pmc_processhash_mtx; /* spin mutex */
149 static u_long pmc_processhashmask;
150 static LIST_HEAD(pmc_processhash, pmc_process) *pmc_processhash;
153 * Hash table of PMC owner descriptors. This table is protected by
154 * the shared PMC "sx" lock.
157 static u_long pmc_ownerhashmask;
158 static LIST_HEAD(pmc_ownerhash, pmc_owner) *pmc_ownerhash;
161 * List of PMC owners with system-wide sampling PMCs.
164 static LIST_HEAD(, pmc_owner) pmc_ss_owners;
168 * A map of row indices to classdep structures.
170 static struct pmc_classdep **pmc_rowindex_to_classdep;
177 static int pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS);
178 static int pmc_debugflags_parse(char *newstr, char *fence);
181 static int load(struct module *module, int cmd, void *arg);
182 static int pmc_attach_process(struct proc *p, struct pmc *pm);
183 static struct pmc *pmc_allocate_pmc_descriptor(void);
184 static struct pmc_owner *pmc_allocate_owner_descriptor(struct proc *p);
185 static int pmc_attach_one_process(struct proc *p, struct pmc *pm);
186 static int pmc_can_allocate_rowindex(struct proc *p, unsigned int ri,
188 static int pmc_can_attach(struct pmc *pm, struct proc *p);
189 static void pmc_capture_user_callchain(int cpu, int soft, struct trapframe *tf);
190 static void pmc_cleanup(void);
191 static int pmc_detach_process(struct proc *p, struct pmc *pm);
192 static int pmc_detach_one_process(struct proc *p, struct pmc *pm,
194 static void pmc_destroy_owner_descriptor(struct pmc_owner *po);
195 static void pmc_destroy_pmc_descriptor(struct pmc *pm);
196 static struct pmc_owner *pmc_find_owner_descriptor(struct proc *p);
197 static int pmc_find_pmc(pmc_id_t pmcid, struct pmc **pm);
198 static struct pmc *pmc_find_pmc_descriptor_in_process(struct pmc_owner *po,
200 static struct pmc_process *pmc_find_process_descriptor(struct proc *p,
202 static void pmc_force_context_switch(void);
203 static void pmc_link_target_process(struct pmc *pm,
204 struct pmc_process *pp);
205 static void pmc_log_all_process_mappings(struct pmc_owner *po);
206 static void pmc_log_kernel_mappings(struct pmc *pm);
207 static void pmc_log_process_mappings(struct pmc_owner *po, struct proc *p);
208 static void pmc_maybe_remove_owner(struct pmc_owner *po);
209 static void pmc_process_csw_in(struct thread *td);
210 static void pmc_process_csw_out(struct thread *td);
211 static void pmc_process_exit(void *arg, struct proc *p);
212 static void pmc_process_fork(void *arg, struct proc *p1,
213 struct proc *p2, int n);
214 static void pmc_process_samples(int cpu, int soft);
215 static void pmc_release_pmc_descriptor(struct pmc *pmc);
216 static void pmc_remove_owner(struct pmc_owner *po);
217 static void pmc_remove_process_descriptor(struct pmc_process *pp);
218 static void pmc_restore_cpu_binding(struct pmc_binding *pb);
219 static void pmc_save_cpu_binding(struct pmc_binding *pb);
220 static void pmc_select_cpu(int cpu);
221 static int pmc_start(struct pmc *pm);
222 static int pmc_stop(struct pmc *pm);
223 static int pmc_syscall_handler(struct thread *td, void *syscall_args);
224 static void pmc_unlink_target_process(struct pmc *pmc,
225 struct pmc_process *pp);
226 static int generic_switch_in(struct pmc_cpu *pc, struct pmc_process *pp);
227 static int generic_switch_out(struct pmc_cpu *pc, struct pmc_process *pp);
228 static struct pmc_mdep *pmc_generic_cpu_initialize(void);
229 static void pmc_generic_cpu_finalize(struct pmc_mdep *md);
232 * Kernel tunables and sysctl(8) interface.
235 SYSCTL_DECL(_kern_hwpmc);
237 static int pmc_callchaindepth = PMC_CALLCHAIN_DEPTH;
238 SYSCTL_INT(_kern_hwpmc, OID_AUTO, callchaindepth, CTLFLAG_RDTUN,
239 &pmc_callchaindepth, 0, "depth of call chain records");
242 struct pmc_debugflags pmc_debugflags = PMC_DEBUG_DEFAULT_FLAGS;
243 char pmc_debugstr[PMC_DEBUG_STRSIZE];
244 TUNABLE_STR(PMC_SYSCTL_NAME_PREFIX "debugflags", pmc_debugstr,
245 sizeof(pmc_debugstr));
246 SYSCTL_PROC(_kern_hwpmc, OID_AUTO, debugflags,
247 CTLTYPE_STRING | CTLFLAG_RWTUN | CTLFLAG_NOFETCH,
248 0, 0, pmc_debugflags_sysctl_handler, "A", "debug flags");
252 * kern.hwpmc.hashrows -- determines the number of rows in the
253 * of the hash table used to look up threads
256 static int pmc_hashsize = PMC_HASH_SIZE;
257 SYSCTL_INT(_kern_hwpmc, OID_AUTO, hashsize, CTLFLAG_RDTUN,
258 &pmc_hashsize, 0, "rows in hash tables");
261 * kern.hwpmc.nsamples --- number of PC samples/callchain stacks per CPU
264 static int pmc_nsamples = PMC_NSAMPLES;
265 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nsamples, CTLFLAG_RDTUN,
266 &pmc_nsamples, 0, "number of PC samples per CPU");
270 * kern.hwpmc.mtxpoolsize -- number of mutexes in the mutex pool.
273 static int pmc_mtxpool_size = PMC_MTXPOOL_SIZE;
274 SYSCTL_INT(_kern_hwpmc, OID_AUTO, mtxpoolsize, CTLFLAG_RDTUN,
275 &pmc_mtxpool_size, 0, "size of spin mutex pool");
279 * security.bsd.unprivileged_syspmcs -- allow non-root processes to
280 * allocate system-wide PMCs.
282 * Allowing unprivileged processes to allocate system PMCs is convenient
283 * if system-wide measurements need to be taken concurrently with other
284 * per-process measurements. This feature is turned off by default.
287 static int pmc_unprivileged_syspmcs = 0;
288 SYSCTL_INT(_security_bsd, OID_AUTO, unprivileged_syspmcs, CTLFLAG_RWTUN,
289 &pmc_unprivileged_syspmcs, 0,
290 "allow unprivileged process to allocate system PMCs");
293 * Hash function. Discard the lower 2 bits of the pointer since
294 * these are always zero for our uses. The hash multiplier is
295 * round((2^LONG_BIT) * ((sqrt(5)-1)/2)).
299 #define _PMC_HM 11400714819323198486u
301 #define _PMC_HM 2654435769u
303 #error Must know the size of 'long' to compile
306 #define PMC_HASH_PTR(P,M) ((((unsigned long) (P) >> 2) * _PMC_HM) & (M))
312 /* The `sysent' for the new syscall */
313 static struct sysent pmc_sysent = {
315 .sy_call = pmc_syscall_handler,
318 static struct syscall_module_data pmc_syscall_mod = {
321 .offset = &pmc_syscall_num,
322 .new_sysent = &pmc_sysent,
323 .old_sysent = { .sy_narg = 0, .sy_call = NULL },
324 .flags = SY_THR_STATIC_KLD,
327 static moduledata_t pmc_mod = {
328 .name = PMC_MODULE_NAME,
329 .evhand = syscall_module_handler,
330 .priv = &pmc_syscall_mod,
333 #ifdef EARLY_AP_STARTUP
334 DECLARE_MODULE(pmc, pmc_mod, SI_SUB_SYSCALLS, SI_ORDER_ANY);
336 DECLARE_MODULE(pmc, pmc_mod, SI_SUB_SMP, SI_ORDER_ANY);
338 MODULE_VERSION(pmc, PMC_VERSION);
341 enum pmc_dbgparse_state {
342 PMCDS_WS, /* in whitespace */
343 PMCDS_MAJOR, /* seen a major keyword */
348 pmc_debugflags_parse(char *newstr, char *fence)
351 struct pmc_debugflags *tmpflags;
352 int error, found, *newbits, tmp;
355 tmpflags = malloc(sizeof(*tmpflags), M_PMC, M_WAITOK|M_ZERO);
360 for (; p < fence && (c = *p); p++) {
362 /* skip white space */
363 if (c == ' ' || c == '\t')
366 /* look for a keyword followed by "=" */
367 for (q = p; p < fence && (c = *p) && c != '='; p++)
377 /* lookup flag group name */
378 #define DBG_SET_FLAG_MAJ(S,F) \
379 if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \
380 newbits = &tmpflags->pdb_ ## F;
382 DBG_SET_FLAG_MAJ("cpu", CPU);
383 DBG_SET_FLAG_MAJ("csw", CSW);
384 DBG_SET_FLAG_MAJ("logging", LOG);
385 DBG_SET_FLAG_MAJ("module", MOD);
386 DBG_SET_FLAG_MAJ("md", MDP);
387 DBG_SET_FLAG_MAJ("owner", OWN);
388 DBG_SET_FLAG_MAJ("pmc", PMC);
389 DBG_SET_FLAG_MAJ("process", PRC);
390 DBG_SET_FLAG_MAJ("sampling", SAM);
392 if (newbits == NULL) {
397 p++; /* skip the '=' */
399 /* Now parse the individual flags */
402 for (q = p; p < fence && (c = *p); p++)
403 if (c == ' ' || c == '\t' || c == ',')
406 /* p == fence or c == ws or c == "," or c == 0 */
408 if ((kwlen = p - q) == 0) {
414 #define DBG_SET_FLAG_MIN(S,F) \
415 if (kwlen == sizeof(S)-1 && strncmp(q, S, kwlen) == 0) \
416 tmp |= found = (1 << PMC_DEBUG_MIN_ ## F)
418 /* a '*' denotes all possible flags in the group */
419 if (kwlen == 1 && *q == '*')
421 /* look for individual flag names */
422 DBG_SET_FLAG_MIN("allocaterow", ALR);
423 DBG_SET_FLAG_MIN("allocate", ALL);
424 DBG_SET_FLAG_MIN("attach", ATT);
425 DBG_SET_FLAG_MIN("bind", BND);
426 DBG_SET_FLAG_MIN("config", CFG);
427 DBG_SET_FLAG_MIN("exec", EXC);
428 DBG_SET_FLAG_MIN("exit", EXT);
429 DBG_SET_FLAG_MIN("find", FND);
430 DBG_SET_FLAG_MIN("flush", FLS);
431 DBG_SET_FLAG_MIN("fork", FRK);
432 DBG_SET_FLAG_MIN("getbuf", GTB);
433 DBG_SET_FLAG_MIN("hook", PMH);
434 DBG_SET_FLAG_MIN("init", INI);
435 DBG_SET_FLAG_MIN("intr", INT);
436 DBG_SET_FLAG_MIN("linktarget", TLK);
437 DBG_SET_FLAG_MIN("mayberemove", OMR);
438 DBG_SET_FLAG_MIN("ops", OPS);
439 DBG_SET_FLAG_MIN("read", REA);
440 DBG_SET_FLAG_MIN("register", REG);
441 DBG_SET_FLAG_MIN("release", REL);
442 DBG_SET_FLAG_MIN("remove", ORM);
443 DBG_SET_FLAG_MIN("sample", SAM);
444 DBG_SET_FLAG_MIN("scheduleio", SIO);
445 DBG_SET_FLAG_MIN("select", SEL);
446 DBG_SET_FLAG_MIN("signal", SIG);
447 DBG_SET_FLAG_MIN("swi", SWI);
448 DBG_SET_FLAG_MIN("swo", SWO);
449 DBG_SET_FLAG_MIN("start", STA);
450 DBG_SET_FLAG_MIN("stop", STO);
451 DBG_SET_FLAG_MIN("syscall", PMS);
452 DBG_SET_FLAG_MIN("unlinktarget", TUL);
453 DBG_SET_FLAG_MIN("write", WRI);
455 /* unrecognized flag name */
460 if (c == 0 || c == ' ' || c == '\t') { /* end of flag group */
469 /* save the new flag set */
470 bcopy(tmpflags, &pmc_debugflags, sizeof(pmc_debugflags));
473 free(tmpflags, M_PMC);
478 pmc_debugflags_sysctl_handler(SYSCTL_HANDLER_ARGS)
480 char *fence, *newstr;
484 (void) arg1; (void) arg2; /* unused parameters */
486 n = sizeof(pmc_debugstr);
487 newstr = malloc(n, M_PMC, M_WAITOK|M_ZERO);
488 (void) strlcpy(newstr, pmc_debugstr, n);
490 error = sysctl_handle_string(oidp, newstr, n, req);
492 /* if there is a new string, parse and copy it */
493 if (error == 0 && req->newptr != NULL) {
494 fence = newstr + (n < req->newlen ? n : req->newlen + 1);
495 if ((error = pmc_debugflags_parse(newstr, fence)) == 0)
496 (void) strlcpy(pmc_debugstr, newstr,
497 sizeof(pmc_debugstr));
507 * Map a row index to a classdep structure and return the adjusted row
508 * index for the PMC class index.
510 static struct pmc_classdep *
511 pmc_ri_to_classdep(struct pmc_mdep *md, int ri, int *adjri)
513 struct pmc_classdep *pcd;
517 KASSERT(ri >= 0 && ri < md->pmd_npmc,
518 ("[pmc,%d] illegal row-index %d", __LINE__, ri));
520 pcd = pmc_rowindex_to_classdep[ri];
523 ("[pmc,%d] ri %d null pcd", __LINE__, ri));
525 *adjri = ri - pcd->pcd_ri;
527 KASSERT(*adjri >= 0 && *adjri < pcd->pcd_num,
528 ("[pmc,%d] adjusted row-index %d", __LINE__, *adjri));
534 * Concurrency Control
536 * The driver manages the following data structures:
538 * - target process descriptors, one per target process
539 * - owner process descriptors (and attached lists), one per owner process
540 * - lookup hash tables for owner and target processes
541 * - PMC descriptors (and attached lists)
542 * - per-cpu hardware state
543 * - the 'hook' variable through which the kernel calls into
545 * - the machine hardware state (managed by the MD layer)
547 * These data structures are accessed from:
549 * - thread context-switch code
550 * - interrupt handlers (possibly on multiple cpus)
551 * - kernel threads on multiple cpus running on behalf of user
552 * processes doing system calls
553 * - this driver's private kernel threads
555 * = Locks and Locking strategy =
557 * The driver uses four locking strategies for its operation:
559 * - The global SX lock "pmc_sx" is used to protect internal
562 * Calls into the module by syscall() start with this lock being
563 * held in exclusive mode. Depending on the requested operation,
564 * the lock may be downgraded to 'shared' mode to allow more
565 * concurrent readers into the module. Calls into the module from
566 * other parts of the kernel acquire the lock in shared mode.
568 * This SX lock is held in exclusive mode for any operations that
569 * modify the linkages between the driver's internal data structures.
571 * The 'pmc_hook' function pointer is also protected by this lock.
572 * It is only examined with the sx lock held in exclusive mode. The
573 * kernel module is allowed to be unloaded only with the sx lock held
574 * in exclusive mode. In normal syscall handling, after acquiring the
575 * pmc_sx lock we first check that 'pmc_hook' is non-null before
576 * proceeding. This prevents races between the thread unloading the module
577 * and other threads seeking to use the module.
579 * - Lookups of target process structures and owner process structures
580 * cannot use the global "pmc_sx" SX lock because these lookups need
581 * to happen during context switches and in other critical sections
582 * where sleeping is not allowed. We protect these lookup tables
583 * with their own private spin-mutexes, "pmc_processhash_mtx" and
584 * "pmc_ownerhash_mtx".
586 * - Interrupt handlers work in a lock free manner. At interrupt
587 * time, handlers look at the PMC pointer (phw->phw_pmc) configured
588 * when the PMC was started. If this pointer is NULL, the interrupt
589 * is ignored after updating driver statistics. We ensure that this
590 * pointer is set (using an atomic operation if necessary) before the
591 * PMC hardware is started. Conversely, this pointer is unset atomically
592 * only after the PMC hardware is stopped.
594 * We ensure that everything needed for the operation of an
595 * interrupt handler is available without it needing to acquire any
596 * locks. We also ensure that a PMC's software state is destroyed only
597 * after the PMC is taken off hardware (on all CPUs).
599 * - Context-switch handling with process-private PMCs needs more
602 * A given process may be the target of multiple PMCs. For example,
603 * PMCATTACH and PMCDETACH may be requested by a process on one CPU
604 * while the target process is running on another. A PMC could also
605 * be getting released because its owner is exiting. We tackle
606 * these situations in the following manner:
608 * - each target process structure 'pmc_process' has an array
609 * of 'struct pmc *' pointers, one for each hardware PMC.
611 * - At context switch IN time, each "target" PMC in RUNNING state
612 * gets started on hardware and a pointer to each PMC is copied into
613 * the per-cpu phw array. The 'runcount' for the PMC is
616 * - At context switch OUT time, all process-virtual PMCs are stopped
617 * on hardware. The saved value is added to the PMCs value field
618 * only if the PMC is in a non-deleted state (the PMCs state could
619 * have changed during the current time slice).
621 * Note that since in-between a switch IN on a processor and a switch
622 * OUT, the PMC could have been released on another CPU. Therefore
623 * context switch OUT always looks at the hardware state to turn
624 * OFF PMCs and will update a PMC's saved value only if reachable
625 * from the target process record.
627 * - OP PMCRELEASE could be called on a PMC at any time (the PMC could
628 * be attached to many processes at the time of the call and could
629 * be active on multiple CPUs).
631 * We prevent further scheduling of the PMC by marking it as in
632 * state 'DELETED'. If the runcount of the PMC is non-zero then
633 * this PMC is currently running on a CPU somewhere. The thread
634 * doing the PMCRELEASE operation waits by repeatedly doing a
635 * pause() till the runcount comes to zero.
637 * The contents of a PMC descriptor (struct pmc) are protected using
638 * a spin-mutex. In order to save space, we use a mutex pool.
640 * In terms of lock types used by witness(4), we use:
641 * - Type "pmc-sx", used by the global SX lock.
642 * - Type "pmc-sleep", for sleep mutexes used by logger threads.
643 * - Type "pmc-per-proc", for protecting PMC owner descriptors.
644 * - Type "pmc-leaf", used for all other spin mutexes.
648 * save the cpu binding of the current kthread
652 pmc_save_cpu_binding(struct pmc_binding *pb)
654 PMCDBG0(CPU,BND,2, "save-cpu");
655 thread_lock(curthread);
656 pb->pb_bound = sched_is_bound(curthread);
657 pb->pb_cpu = curthread->td_oncpu;
658 thread_unlock(curthread);
659 PMCDBG1(CPU,BND,2, "save-cpu cpu=%d", pb->pb_cpu);
663 * restore the cpu binding of the current thread
667 pmc_restore_cpu_binding(struct pmc_binding *pb)
669 PMCDBG2(CPU,BND,2, "restore-cpu curcpu=%d restore=%d",
670 curthread->td_oncpu, pb->pb_cpu);
671 thread_lock(curthread);
673 sched_bind(curthread, pb->pb_cpu);
675 sched_unbind(curthread);
676 thread_unlock(curthread);
677 PMCDBG0(CPU,BND,2, "restore-cpu done");
681 * move execution over the specified cpu and bind it there.
685 pmc_select_cpu(int cpu)
687 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
688 ("[pmc,%d] bad cpu number %d", __LINE__, cpu));
690 /* Never move to an inactive CPU. */
691 KASSERT(pmc_cpu_is_active(cpu), ("[pmc,%d] selecting inactive "
692 "CPU %d", __LINE__, cpu));
694 PMCDBG1(CPU,SEL,2, "select-cpu cpu=%d", cpu);
695 thread_lock(curthread);
696 sched_bind(curthread, cpu);
697 thread_unlock(curthread);
699 KASSERT(curthread->td_oncpu == cpu,
700 ("[pmc,%d] CPU not bound [cpu=%d, curr=%d]", __LINE__,
701 cpu, curthread->td_oncpu));
703 PMCDBG1(CPU,SEL,2, "select-cpu cpu=%d ok", cpu);
707 * Force a context switch.
709 * We do this by pause'ing for 1 tick -- invoking mi_switch() is not
710 * guaranteed to force a context switch.
714 pmc_force_context_switch(void)
721 * Get the file name for an executable. This is a simple wrapper
722 * around vn_fullpath(9).
726 pmc_getfilename(struct vnode *v, char **fullpath, char **freepath)
729 *fullpath = "unknown";
731 vn_fullpath(curthread, v, fullpath, freepath);
735 * remove an process owning PMCs
739 pmc_remove_owner(struct pmc_owner *po)
741 struct pmc *pm, *tmp;
743 sx_assert(&pmc_sx, SX_XLOCKED);
745 PMCDBG1(OWN,ORM,1, "remove-owner po=%p", po);
747 /* Remove descriptor from the owner hash table */
748 LIST_REMOVE(po, po_next);
750 /* release all owned PMC descriptors */
751 LIST_FOREACH_SAFE(pm, &po->po_pmcs, pm_next, tmp) {
752 PMCDBG1(OWN,ORM,2, "pmc=%p", pm);
753 KASSERT(pm->pm_owner == po,
754 ("[pmc,%d] owner %p != po %p", __LINE__, pm->pm_owner, po));
756 pmc_release_pmc_descriptor(pm); /* will unlink from the list */
757 pmc_destroy_pmc_descriptor(pm);
760 KASSERT(po->po_sscount == 0,
761 ("[pmc,%d] SS count not zero", __LINE__));
762 KASSERT(LIST_EMPTY(&po->po_pmcs),
763 ("[pmc,%d] PMC list not empty", __LINE__));
765 /* de-configure the log file if present */
766 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
767 pmclog_deconfigure_log(po);
771 * remove an owner process record if all conditions are met.
775 pmc_maybe_remove_owner(struct pmc_owner *po)
778 PMCDBG1(OWN,OMR,1, "maybe-remove-owner po=%p", po);
781 * Remove owner record if
782 * - this process does not own any PMCs
783 * - this process has not allocated a system-wide sampling buffer
786 if (LIST_EMPTY(&po->po_pmcs) &&
787 ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)) {
788 pmc_remove_owner(po);
789 pmc_destroy_owner_descriptor(po);
794 * Add an association between a target process and a PMC.
798 pmc_link_target_process(struct pmc *pm, struct pmc_process *pp)
801 struct pmc_target *pt;
803 sx_assert(&pmc_sx, SX_XLOCKED);
805 KASSERT(pm != NULL && pp != NULL,
806 ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp));
807 KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)),
808 ("[pmc,%d] Attaching a non-process-virtual pmc=%p to pid=%d",
809 __LINE__, pm, pp->pp_proc->p_pid));
810 KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= ((int) md->pmd_npmc - 1),
811 ("[pmc,%d] Illegal reference count %d for process record %p",
812 __LINE__, pp->pp_refcnt, (void *) pp));
814 ri = PMC_TO_ROWINDEX(pm);
816 PMCDBG3(PRC,TLK,1, "link-target pmc=%p ri=%d pmc-process=%p",
820 LIST_FOREACH(pt, &pm->pm_targets, pt_next)
821 if (pt->pt_process == pp)
822 KASSERT(0, ("[pmc,%d] pp %p already in pmc %p targets",
826 pt = malloc(sizeof(struct pmc_target), M_PMC, M_WAITOK|M_ZERO);
829 LIST_INSERT_HEAD(&pm->pm_targets, pt, pt_next);
831 atomic_store_rel_ptr((uintptr_t *)&pp->pp_pmcs[ri].pp_pmc,
834 if (pm->pm_owner->po_owner == pp->pp_proc)
835 pm->pm_flags |= PMC_F_ATTACHED_TO_OWNER;
838 * Initialize the per-process values at this row index.
840 pp->pp_pmcs[ri].pp_pmcval = PMC_TO_MODE(pm) == PMC_MODE_TS ?
841 pm->pm_sc.pm_reloadcount : 0;
848 * Removes the association between a target process and a PMC.
852 pmc_unlink_target_process(struct pmc *pm, struct pmc_process *pp)
856 struct pmc_target *ptgt;
858 sx_assert(&pmc_sx, SX_XLOCKED);
860 KASSERT(pm != NULL && pp != NULL,
861 ("[pmc,%d] Null pm %p or pp %p", __LINE__, pm, pp));
863 KASSERT(pp->pp_refcnt >= 1 && pp->pp_refcnt <= (int) md->pmd_npmc,
864 ("[pmc,%d] Illegal ref count %d on process record %p",
865 __LINE__, pp->pp_refcnt, (void *) pp));
867 ri = PMC_TO_ROWINDEX(pm);
869 PMCDBG3(PRC,TUL,1, "unlink-target pmc=%p ri=%d pmc-process=%p",
872 KASSERT(pp->pp_pmcs[ri].pp_pmc == pm,
873 ("[pmc,%d] PMC ri %d mismatch pmc %p pp->[ri] %p", __LINE__,
874 ri, pm, pp->pp_pmcs[ri].pp_pmc));
876 pp->pp_pmcs[ri].pp_pmc = NULL;
877 pp->pp_pmcs[ri].pp_pmcval = (pmc_value_t) 0;
879 /* Remove owner-specific flags */
880 if (pm->pm_owner->po_owner == pp->pp_proc) {
881 pp->pp_flags &= ~PMC_PP_ENABLE_MSR_ACCESS;
882 pm->pm_flags &= ~PMC_F_ATTACHED_TO_OWNER;
887 /* Remove the target process from the PMC structure */
888 LIST_FOREACH(ptgt, &pm->pm_targets, pt_next)
889 if (ptgt->pt_process == pp)
892 KASSERT(ptgt != NULL, ("[pmc,%d] process %p (pp: %p) not found "
893 "in pmc %p", __LINE__, pp->pp_proc, pp, pm));
895 LIST_REMOVE(ptgt, pt_next);
898 /* if the PMC now lacks targets, send the owner a SIGIO */
899 if (LIST_EMPTY(&pm->pm_targets)) {
900 p = pm->pm_owner->po_owner;
902 kern_psignal(p, SIGIO);
905 PMCDBG2(PRC,SIG,2, "signalling proc=%p signal=%d", p,
911 * Check if PMC 'pm' may be attached to target process 't'.
915 pmc_can_attach(struct pmc *pm, struct proc *t)
917 struct proc *o; /* pmc owner */
918 struct ucred *oc, *tc; /* owner, target credentials */
919 int decline_attach, i;
922 * A PMC's owner can always attach that PMC to itself.
925 if ((o = pm->pm_owner->po_owner) == t)
939 * The effective uid of the PMC owner should match at least one
940 * of the {effective,real,saved} uids of the target process.
943 decline_attach = oc->cr_uid != tc->cr_uid &&
944 oc->cr_uid != tc->cr_svuid &&
945 oc->cr_uid != tc->cr_ruid;
948 * Every one of the target's group ids, must be in the owner's
951 for (i = 0; !decline_attach && i < tc->cr_ngroups; i++)
952 decline_attach = !groupmember(tc->cr_groups[i], oc);
954 /* check the read and saved gids too */
955 if (decline_attach == 0)
956 decline_attach = !groupmember(tc->cr_rgid, oc) ||
957 !groupmember(tc->cr_svgid, oc);
962 return !decline_attach;
966 * Attach a process to a PMC.
970 pmc_attach_one_process(struct proc *p, struct pmc *pm)
973 char *fullpath, *freepath;
974 struct pmc_process *pp;
976 sx_assert(&pmc_sx, SX_XLOCKED);
978 PMCDBG5(PRC,ATT,2, "attach-one pm=%p ri=%d proc=%p (%d, %s)", pm,
979 PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm);
982 * Locate the process descriptor corresponding to process 'p',
983 * allocating space as needed.
985 * Verify that rowindex 'pm_rowindex' is free in the process
988 * If not, allocate space for a descriptor and link the
989 * process descriptor and PMC.
991 ri = PMC_TO_ROWINDEX(pm);
993 if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_ALLOCATE)) == NULL)
996 if (pp->pp_pmcs[ri].pp_pmc == pm) /* already present at slot [ri] */
999 if (pp->pp_pmcs[ri].pp_pmc != NULL)
1002 pmc_link_target_process(pm, pp);
1004 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)) &&
1005 (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER) == 0)
1006 pm->pm_flags |= PMC_F_NEEDS_LOGFILE;
1008 pm->pm_flags |= PMC_F_ATTACH_DONE; /* mark as attached */
1010 /* issue an attach event to a configured log file */
1011 if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE) {
1012 if (p->p_flag & P_KPROC) {
1013 fullpath = kernelname;
1016 pmc_getfilename(p->p_textvp, &fullpath, &freepath);
1017 pmclog_process_pmcattach(pm, p->p_pid, fullpath);
1019 free(freepath, M_TEMP);
1020 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
1021 pmc_log_process_mappings(pm->pm_owner, p);
1023 /* mark process as using HWPMCs */
1025 p->p_flag |= P_HWPMC;
1032 * Attach a process and optionally its children
1036 pmc_attach_process(struct proc *p, struct pmc *pm)
1041 sx_assert(&pmc_sx, SX_XLOCKED);
1043 PMCDBG5(PRC,ATT,1, "attach pm=%p ri=%d proc=%p (%d, %s)", pm,
1044 PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm);
1048 * If this PMC successfully allowed a GETMSR operation
1049 * in the past, disallow further ATTACHes.
1052 if ((pm->pm_flags & PMC_PP_ENABLE_MSR_ACCESS) != 0)
1055 if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0)
1056 return pmc_attach_one_process(p, pm);
1059 * Traverse all child processes, attaching them to
1063 sx_slock(&proctree_lock);
1068 if ((error = pmc_attach_one_process(p, pm)) != 0)
1070 if (!LIST_EMPTY(&p->p_children))
1071 p = LIST_FIRST(&p->p_children);
1075 if (LIST_NEXT(p, p_sibling)) {
1076 p = LIST_NEXT(p, p_sibling);
1084 (void) pmc_detach_process(top, pm);
1087 sx_sunlock(&proctree_lock);
1092 * Detach a process from a PMC. If there are no other PMCs tracking
1093 * this process, remove the process structure from its hash table. If
1094 * 'flags' contains PMC_FLAG_REMOVE, then free the process structure.
1098 pmc_detach_one_process(struct proc *p, struct pmc *pm, int flags)
1101 struct pmc_process *pp;
1103 sx_assert(&pmc_sx, SX_XLOCKED);
1106 ("[pmc,%d] null pm pointer", __LINE__));
1108 ri = PMC_TO_ROWINDEX(pm);
1110 PMCDBG6(PRC,ATT,2, "detach-one pm=%p ri=%d proc=%p (%d, %s) flags=0x%x",
1111 pm, ri, p, p->p_pid, p->p_comm, flags);
1113 if ((pp = pmc_find_process_descriptor(p, 0)) == NULL)
1116 if (pp->pp_pmcs[ri].pp_pmc != pm)
1119 pmc_unlink_target_process(pm, pp);
1121 /* Issue a detach entry if a log file is configured */
1122 if (pm->pm_owner->po_flags & PMC_PO_OWNS_LOGFILE)
1123 pmclog_process_pmcdetach(pm, p->p_pid);
1126 * If there are no PMCs targeting this process, we remove its
1127 * descriptor from the target hash table and unset the P_HWPMC
1128 * flag in the struct proc.
1130 KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc,
1131 ("[pmc,%d] Illegal refcnt %d for process struct %p",
1132 __LINE__, pp->pp_refcnt, pp));
1134 if (pp->pp_refcnt != 0) /* still a target of some PMC */
1137 pmc_remove_process_descriptor(pp);
1139 if (flags & PMC_FLAG_REMOVE)
1143 p->p_flag &= ~P_HWPMC;
1150 * Detach a process and optionally its descendants from a PMC.
1154 pmc_detach_process(struct proc *p, struct pmc *pm)
1158 sx_assert(&pmc_sx, SX_XLOCKED);
1160 PMCDBG5(PRC,ATT,1, "detach pm=%p ri=%d proc=%p (%d, %s)", pm,
1161 PMC_TO_ROWINDEX(pm), p, p->p_pid, p->p_comm);
1163 if ((pm->pm_flags & PMC_F_DESCENDANTS) == 0)
1164 return pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE);
1167 * Traverse all children, detaching them from this PMC. We
1168 * ignore errors since we could be detaching a PMC from a
1169 * partially attached proc tree.
1172 sx_slock(&proctree_lock);
1177 (void) pmc_detach_one_process(p, pm, PMC_FLAG_REMOVE);
1179 if (!LIST_EMPTY(&p->p_children))
1180 p = LIST_FIRST(&p->p_children);
1184 if (LIST_NEXT(p, p_sibling)) {
1185 p = LIST_NEXT(p, p_sibling);
1193 sx_sunlock(&proctree_lock);
1195 if (LIST_EMPTY(&pm->pm_targets))
1196 pm->pm_flags &= ~PMC_F_ATTACH_DONE;
1203 * Thread context switch IN
1207 pmc_process_csw_in(struct thread *td)
1210 unsigned int adjri, ri;
1215 pmc_value_t newvalue;
1216 struct pmc_process *pp;
1217 struct pmc_classdep *pcd;
1221 if ((pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE)) == NULL)
1224 KASSERT(pp->pp_proc == td->td_proc,
1225 ("[pmc,%d] not my thread state", __LINE__));
1227 critical_enter(); /* no preemption from this point */
1229 cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */
1231 PMCDBG5(CSW,SWI,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p,
1232 p->p_pid, p->p_comm, pp);
1234 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1235 ("[pmc,%d] weird CPU id %d", __LINE__, cpu));
1239 for (ri = 0; ri < md->pmd_npmc; ri++) {
1241 if ((pm = pp->pp_pmcs[ri].pp_pmc) == NULL)
1244 KASSERT(PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)),
1245 ("[pmc,%d] Target PMC in non-virtual mode (%d)",
1246 __LINE__, PMC_TO_MODE(pm)));
1248 KASSERT(PMC_TO_ROWINDEX(pm) == ri,
1249 ("[pmc,%d] Row index mismatch pmc %d != ri %d",
1250 __LINE__, PMC_TO_ROWINDEX(pm), ri));
1253 * Only PMCs that are marked as 'RUNNING' need
1254 * be placed on hardware.
1257 if (pm->pm_state != PMC_STATE_RUNNING)
1260 /* increment PMC runcount */
1261 atomic_add_rel_int(&pm->pm_runcount, 1);
1263 /* configure the HWPMC we are going to use. */
1264 pcd = pmc_ri_to_classdep(md, ri, &adjri);
1265 pcd->pcd_config_pmc(cpu, adjri, pm);
1267 phw = pc->pc_hwpmcs[ri];
1269 KASSERT(phw != NULL,
1270 ("[pmc,%d] null hw pointer", __LINE__));
1272 KASSERT(phw->phw_pmc == pm,
1273 ("[pmc,%d] hw->pmc %p != pmc %p", __LINE__,
1277 * Write out saved value and start the PMC.
1279 * Sampling PMCs use a per-process value, while
1280 * counting mode PMCs use a per-pmc value that is
1281 * inherited across descendants.
1283 if (PMC_TO_MODE(pm) == PMC_MODE_TS) {
1284 mtx_pool_lock_spin(pmc_mtxpool, pm);
1287 * Use the saved value calculated after the most recent
1288 * thread switch out to start this counter. Reset
1289 * the saved count in case another thread from this
1290 * process switches in before any threads switch out.
1292 newvalue = PMC_PCPU_SAVED(cpu,ri) =
1293 pp->pp_pmcs[ri].pp_pmcval;
1294 pp->pp_pmcs[ri].pp_pmcval = pm->pm_sc.pm_reloadcount;
1295 mtx_pool_unlock_spin(pmc_mtxpool, pm);
1297 KASSERT(PMC_TO_MODE(pm) == PMC_MODE_TC,
1298 ("[pmc,%d] illegal mode=%d", __LINE__,
1300 mtx_pool_lock_spin(pmc_mtxpool, pm);
1301 newvalue = PMC_PCPU_SAVED(cpu, ri) =
1302 pm->pm_gv.pm_savedvalue;
1303 mtx_pool_unlock_spin(pmc_mtxpool, pm);
1306 PMCDBG3(CSW,SWI,1,"cpu=%d ri=%d new=%jd", cpu, ri, newvalue);
1308 pcd->pcd_write_pmc(cpu, adjri, newvalue);
1310 /* If a sampling mode PMC, reset stalled state. */
1311 if (PMC_TO_MODE(pm) == PMC_MODE_TS)
1312 CPU_CLR_ATOMIC(cpu, &pm->pm_stalled);
1314 /* Indicate that we desire this to run. */
1315 CPU_SET_ATOMIC(cpu, &pm->pm_cpustate);
1317 /* Start the PMC. */
1318 pcd->pcd_start_pmc(cpu, adjri);
1322 * perform any other architecture/cpu dependent thread
1323 * switch-in actions.
1326 (void) (*md->pmd_switch_in)(pc, pp);
1333 * Thread context switch OUT.
1337 pmc_process_csw_out(struct thread *td)
1345 pmc_value_t newvalue;
1346 unsigned int adjri, ri;
1347 struct pmc_process *pp;
1348 struct pmc_classdep *pcd;
1352 * Locate our process descriptor; this may be NULL if
1353 * this process is exiting and we have already removed
1354 * the process from the target process table.
1356 * Note that due to kernel preemption, multiple
1357 * context switches may happen while the process is
1360 * Note also that if the target process cannot be
1361 * found we still need to deconfigure any PMCs that
1362 * are currently running on hardware.
1366 pp = pmc_find_process_descriptor(p, PMC_FLAG_NONE);
1374 cpu = PCPU_GET(cpuid); /* td->td_oncpu is invalid */
1376 PMCDBG5(CSW,SWO,1, "cpu=%d proc=%p (%d, %s) pp=%p", cpu, p,
1377 p->p_pid, p->p_comm, pp);
1379 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
1380 ("[pmc,%d weird CPU id %d", __LINE__, cpu));
1385 * When a PMC gets unlinked from a target PMC, it will
1386 * be removed from the target's pp_pmc[] array.
1388 * However, on a MP system, the target could have been
1389 * executing on another CPU at the time of the unlink.
1390 * So, at context switch OUT time, we need to look at
1391 * the hardware to determine if a PMC is scheduled on
1395 for (ri = 0; ri < md->pmd_npmc; ri++) {
1397 pcd = pmc_ri_to_classdep(md, ri, &adjri);
1399 (void) (*pcd->pcd_get_config)(cpu, adjri, &pm);
1401 if (pm == NULL) /* nothing at this row index */
1404 mode = PMC_TO_MODE(pm);
1405 if (!PMC_IS_VIRTUAL_MODE(mode))
1406 continue; /* not a process virtual PMC */
1408 KASSERT(PMC_TO_ROWINDEX(pm) == ri,
1409 ("[pmc,%d] ri mismatch pmc(%d) ri(%d)",
1410 __LINE__, PMC_TO_ROWINDEX(pm), ri));
1413 * Change desired state, and then stop if not stalled.
1414 * This two-step dance should avoid race conditions where
1415 * an interrupt re-enables the PMC after this code has
1416 * already checked the pm_stalled flag.
1418 CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate);
1419 if (!CPU_ISSET(cpu, &pm->pm_stalled))
1420 pcd->pcd_stop_pmc(cpu, adjri);
1422 /* reduce this PMC's runcount */
1423 atomic_subtract_rel_int(&pm->pm_runcount, 1);
1426 * If this PMC is associated with this process,
1430 if (pm->pm_state != PMC_STATE_DELETED && pp != NULL &&
1431 pp->pp_pmcs[ri].pp_pmc != NULL) {
1432 KASSERT(pm == pp->pp_pmcs[ri].pp_pmc,
1433 ("[pmc,%d] pm %p != pp_pmcs[%d] %p", __LINE__,
1434 pm, ri, pp->pp_pmcs[ri].pp_pmc));
1436 KASSERT(pp->pp_refcnt > 0,
1437 ("[pmc,%d] pp refcnt = %d", __LINE__,
1440 pcd->pcd_read_pmc(cpu, adjri, &newvalue);
1442 if (mode == PMC_MODE_TS) {
1443 PMCDBG3(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd (samp)",
1444 cpu, ri, PMC_PCPU_SAVED(cpu,ri) - newvalue);
1447 * For sampling process-virtual PMCs,
1448 * newvalue is the number of events to be seen
1449 * until the next sampling interrupt.
1450 * We can just add the events left from this
1451 * invocation to the counter, then adjust
1452 * in case we overflow our range.
1454 * (Recall that we reload the counter every
1457 mtx_pool_lock_spin(pmc_mtxpool, pm);
1459 pp->pp_pmcs[ri].pp_pmcval += newvalue;
1460 if (pp->pp_pmcs[ri].pp_pmcval >
1461 pm->pm_sc.pm_reloadcount)
1462 pp->pp_pmcs[ri].pp_pmcval -=
1463 pm->pm_sc.pm_reloadcount;
1464 KASSERT(pp->pp_pmcs[ri].pp_pmcval > 0 &&
1465 pp->pp_pmcs[ri].pp_pmcval <=
1466 pm->pm_sc.pm_reloadcount,
1467 ("[pmc,%d] pp_pmcval outside of expected "
1468 "range cpu=%d ri=%d pp_pmcval=%jx "
1469 "pm_reloadcount=%jx", __LINE__, cpu, ri,
1470 pp->pp_pmcs[ri].pp_pmcval,
1471 pm->pm_sc.pm_reloadcount));
1472 mtx_pool_unlock_spin(pmc_mtxpool, pm);
1475 tmp = newvalue - PMC_PCPU_SAVED(cpu,ri);
1477 PMCDBG3(CSW,SWO,1,"cpu=%d ri=%d tmp=%jd (count)",
1481 * For counting process-virtual PMCs,
1482 * we expect the count to be
1483 * increasing monotonically, modulo a 64
1487 ("[pmc,%d] negative increment cpu=%d "
1488 "ri=%d newvalue=%jx saved=%jx "
1489 "incr=%jx", __LINE__, cpu, ri,
1490 newvalue, PMC_PCPU_SAVED(cpu,ri), tmp));
1492 mtx_pool_lock_spin(pmc_mtxpool, pm);
1493 pm->pm_gv.pm_savedvalue += tmp;
1494 pp->pp_pmcs[ri].pp_pmcval += tmp;
1495 mtx_pool_unlock_spin(pmc_mtxpool, pm);
1497 if (pm->pm_flags & PMC_F_LOG_PROCCSW)
1498 pmclog_process_proccsw(pm, pp, tmp);
1502 /* mark hardware as free */
1503 pcd->pcd_config_pmc(cpu, adjri, NULL);
1507 * perform any other architecture/cpu dependent thread
1508 * switch out functions.
1511 (void) (*md->pmd_switch_out)(pc, pp);
1517 * A mapping change for a process.
1521 pmc_process_mmap(struct thread *td, struct pmckern_map_in *pkm)
1525 char *fullpath, *freepath;
1526 const struct pmc *pm;
1527 struct pmc_owner *po;
1528 const struct pmc_process *pp;
1530 freepath = fullpath = NULL;
1531 pmc_getfilename((struct vnode *) pkm->pm_file, &fullpath, &freepath);
1533 pid = td->td_proc->p_pid;
1535 /* Inform owners of all system-wide sampling PMCs. */
1536 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
1537 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
1538 pmclog_process_map_in(po, pid, pkm->pm_address, fullpath);
1540 if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL)
1544 * Inform sampling PMC owners tracking this process.
1546 for (ri = 0; ri < md->pmd_npmc; ri++)
1547 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL &&
1548 PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
1549 pmclog_process_map_in(pm->pm_owner,
1550 pid, pkm->pm_address, fullpath);
1554 free(freepath, M_TEMP);
1559 * Log an munmap request.
1563 pmc_process_munmap(struct thread *td, struct pmckern_map_out *pkm)
1567 struct pmc_owner *po;
1568 const struct pmc *pm;
1569 const struct pmc_process *pp;
1571 pid = td->td_proc->p_pid;
1573 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
1574 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
1575 pmclog_process_map_out(po, pid, pkm->pm_address,
1576 pkm->pm_address + pkm->pm_size);
1578 if ((pp = pmc_find_process_descriptor(td->td_proc, 0)) == NULL)
1581 for (ri = 0; ri < md->pmd_npmc; ri++)
1582 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL &&
1583 PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
1584 pmclog_process_map_out(pm->pm_owner, pid,
1585 pkm->pm_address, pkm->pm_address + pkm->pm_size);
1589 * Log mapping information about the kernel.
1593 pmc_log_kernel_mappings(struct pmc *pm)
1595 struct pmc_owner *po;
1596 struct pmckern_map_in *km, *kmbase;
1598 sx_assert(&pmc_sx, SX_LOCKED);
1599 KASSERT(PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)),
1600 ("[pmc,%d] non-sampling PMC (%p) desires mapping information",
1601 __LINE__, (void *) pm));
1605 if (po->po_flags & PMC_PO_INITIAL_MAPPINGS_DONE)
1609 * Log the current set of kernel modules.
1611 kmbase = linker_hwpmc_list_objects();
1612 for (km = kmbase; km->pm_file != NULL; km++) {
1613 PMCDBG2(LOG,REG,1,"%s %p", (char *) km->pm_file,
1614 (void *) km->pm_address);
1615 pmclog_process_map_in(po, (pid_t) -1, km->pm_address,
1618 free(kmbase, M_LINKER);
1620 po->po_flags |= PMC_PO_INITIAL_MAPPINGS_DONE;
1624 * Log the mappings for a single process.
1628 pmc_log_process_mappings(struct pmc_owner *po, struct proc *p)
1633 vm_map_entry_t entry;
1634 vm_offset_t last_end;
1635 u_int last_timestamp;
1636 struct vnode *last_vp;
1637 vm_offset_t start_addr;
1638 vm_object_t obj, lobj, tobj;
1639 char *fullpath, *freepath;
1642 last_end = (vm_offset_t) 0;
1643 fullpath = freepath = NULL;
1645 if ((vm = vmspace_acquire_ref(p)) == NULL)
1649 vm_map_lock_read(map);
1651 for (entry = map->header.next; entry != &map->header; entry = entry->next) {
1653 if (entry == NULL) {
1654 PMCDBG2(LOG,OPS,2, "hwpmc: vm_map entry unexpectedly "
1655 "NULL! pid=%d vm_map=%p\n", p->p_pid, map);
1660 * We only care about executable map entries.
1662 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
1663 !(entry->protection & VM_PROT_EXECUTE) ||
1664 (entry->object.vm_object == NULL)) {
1668 obj = entry->object.vm_object;
1669 VM_OBJECT_RLOCK(obj);
1672 * Walk the backing_object list to find the base
1673 * (non-shadowed) vm_object.
1675 for (lobj = tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
1677 VM_OBJECT_RLOCK(tobj);
1679 VM_OBJECT_RUNLOCK(lobj);
1684 * At this point lobj is the base vm_object and it is locked.
1687 PMCDBG3(LOG,OPS,2, "hwpmc: lobj unexpectedly NULL! pid=%d "
1688 "vm_map=%p vm_obj=%p\n", p->p_pid, map, obj);
1689 VM_OBJECT_RUNLOCK(obj);
1693 vp = vm_object_vnode(lobj);
1696 VM_OBJECT_RUNLOCK(lobj);
1697 VM_OBJECT_RUNLOCK(obj);
1702 * Skip contiguous regions that point to the same
1703 * vnode, so we don't emit redundant MAP-IN
1706 if (entry->start == last_end && vp == last_vp) {
1707 last_end = entry->end;
1709 VM_OBJECT_RUNLOCK(lobj);
1710 VM_OBJECT_RUNLOCK(obj);
1715 * We don't want to keep the proc's vm_map or this
1716 * vm_object locked while we walk the pathname, since
1717 * vn_fullpath() can sleep. However, if we drop the
1718 * lock, it's possible for concurrent activity to
1719 * modify the vm_map list. To protect against this,
1720 * we save the vm_map timestamp before we release the
1721 * lock, and check it after we reacquire the lock
1724 start_addr = entry->start;
1725 last_end = entry->end;
1726 last_timestamp = map->timestamp;
1727 vm_map_unlock_read(map);
1731 VM_OBJECT_RUNLOCK(lobj);
1733 VM_OBJECT_RUNLOCK(obj);
1736 pmc_getfilename(vp, &fullpath, &freepath);
1742 pmclog_process_map_in(po, p->p_pid, start_addr, fullpath);
1744 free(freepath, M_TEMP);
1746 vm_map_lock_read(map);
1749 * If our saved timestamp doesn't match, this means
1750 * that the vm_map was modified out from under us and
1751 * we can't trust our current "entry" pointer. Do a
1752 * new lookup for this entry. If there is no entry
1753 * for this address range, vm_map_lookup_entry() will
1754 * return the previous one, so we always want to go to
1755 * entry->next on the next loop iteration.
1757 * There is an edge condition here that can occur if
1758 * there is no entry at or before this address. In
1759 * this situation, vm_map_lookup_entry returns
1760 * &map->header, which would cause our loop to abort
1761 * without processing the rest of the map. However,
1762 * in practice this will never happen for process
1763 * vm_map. This is because the executable's text
1764 * segment is the first mapping in the proc's address
1765 * space, and this mapping is never removed until the
1766 * process exits, so there will always be a non-header
1767 * entry at or before the requested address for
1768 * vm_map_lookup_entry to return.
1770 if (map->timestamp != last_timestamp)
1771 vm_map_lookup_entry(map, last_end - 1, &entry);
1774 vm_map_unlock_read(map);
1780 * Log mappings for all processes in the system.
1784 pmc_log_all_process_mappings(struct pmc_owner *po)
1786 struct proc *p, *top;
1788 sx_assert(&pmc_sx, SX_XLOCKED);
1790 if ((p = pfind(1)) == NULL)
1791 panic("[pmc,%d] Cannot find init", __LINE__);
1795 sx_slock(&proctree_lock);
1800 pmc_log_process_mappings(po, p);
1801 if (!LIST_EMPTY(&p->p_children))
1802 p = LIST_FIRST(&p->p_children);
1806 if (LIST_NEXT(p, p_sibling)) {
1807 p = LIST_NEXT(p, p_sibling);
1814 sx_sunlock(&proctree_lock);
1818 * The 'hook' invoked from the kernel proper
1823 const char *pmc_hooknames[] = {
1824 /* these strings correspond to PMC_FN_* in <sys/pmckern.h> */
1841 pmc_hook_handler(struct thread *td, int function, void *arg)
1844 PMCDBG4(MOD,PMH,1, "hook td=%p func=%d \"%s\" arg=%p", td, function,
1845 pmc_hooknames[function], arg);
1854 case PMC_FN_PROCESS_EXEC:
1856 char *fullpath, *freepath;
1858 int is_using_hwpmcs;
1861 struct pmc_owner *po;
1862 struct pmc_process *pp;
1863 struct pmckern_procexec *pk;
1865 sx_assert(&pmc_sx, SX_XLOCKED);
1868 pmc_getfilename(p->p_textvp, &fullpath, &freepath);
1870 pk = (struct pmckern_procexec *) arg;
1872 /* Inform owners of SS mode PMCs of the exec event. */
1873 LIST_FOREACH(po, &pmc_ss_owners, po_ssnext)
1874 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
1875 pmclog_process_procexec(po, PMC_ID_INVALID,
1876 p->p_pid, pk->pm_entryaddr, fullpath);
1879 is_using_hwpmcs = p->p_flag & P_HWPMC;
1882 if (!is_using_hwpmcs) {
1884 free(freepath, M_TEMP);
1889 * PMCs are not inherited across an exec(): remove any
1890 * PMCs that this process is the owner of.
1893 if ((po = pmc_find_owner_descriptor(p)) != NULL) {
1894 pmc_remove_owner(po);
1895 pmc_destroy_owner_descriptor(po);
1899 * If the process being exec'ed is not the target of any
1902 if ((pp = pmc_find_process_descriptor(p, 0)) == NULL) {
1904 free(freepath, M_TEMP);
1909 * Log the exec event to all monitoring owners. Skip
1910 * owners who have already received the event because
1911 * they had system sampling PMCs active.
1913 for (ri = 0; ri < md->pmd_npmc; ri++)
1914 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL) {
1916 if (po->po_sscount == 0 &&
1917 po->po_flags & PMC_PO_OWNS_LOGFILE)
1918 pmclog_process_procexec(po, pm->pm_id,
1919 p->p_pid, pk->pm_entryaddr,
1924 free(freepath, M_TEMP);
1927 PMCDBG4(PRC,EXC,1, "exec proc=%p (%d, %s) cred-changed=%d",
1928 p, p->p_pid, p->p_comm, pk->pm_credentialschanged);
1930 if (pk->pm_credentialschanged == 0) /* no change */
1934 * If the newly exec()'ed process has a different credential
1935 * than before, allow it to be the target of a PMC only if
1936 * the PMC's owner has sufficient privilege.
1939 for (ri = 0; ri < md->pmd_npmc; ri++)
1940 if ((pm = pp->pp_pmcs[ri].pp_pmc) != NULL)
1941 if (pmc_can_attach(pm, td->td_proc) != 0)
1942 pmc_detach_one_process(td->td_proc,
1945 KASSERT(pp->pp_refcnt >= 0 && pp->pp_refcnt <= (int) md->pmd_npmc,
1946 ("[pmc,%d] Illegal ref count %d on pp %p", __LINE__,
1947 pp->pp_refcnt, pp));
1950 * If this process is no longer the target of any
1951 * PMCs, we can remove the process entry and free
1955 if (pp->pp_refcnt == 0) {
1956 pmc_remove_process_descriptor(pp);
1965 pmc_process_csw_in(td);
1968 case PMC_FN_CSW_OUT:
1969 pmc_process_csw_out(td);
1973 * Process accumulated PC samples.
1975 * This function is expected to be called by hardclock() for
1976 * each CPU that has accumulated PC samples.
1978 * This function is to be executed on the CPU whose samples
1979 * are being processed.
1981 case PMC_FN_DO_SAMPLES:
1984 * Clear the cpu specific bit in the CPU mask before
1985 * do the rest of the processing. If the NMI handler
1986 * gets invoked after the "atomic_clear_int()" call
1987 * below but before "pmc_process_samples()" gets
1988 * around to processing the interrupt, then we will
1989 * come back here at the next hardclock() tick (and
1990 * may find nothing to do if "pmc_process_samples()"
1991 * had already processed the interrupt). We don't
1992 * lose the interrupt sample.
1994 CPU_CLR_ATOMIC(PCPU_GET(cpuid), &pmc_cpumask);
1995 pmc_process_samples(PCPU_GET(cpuid), PMC_HR);
1996 pmc_process_samples(PCPU_GET(cpuid), PMC_SR);
2000 sx_assert(&pmc_sx, SX_LOCKED);
2001 pmc_process_mmap(td, (struct pmckern_map_in *) arg);
2005 sx_assert(&pmc_sx, SX_LOCKED);
2006 pmc_process_munmap(td, (struct pmckern_map_out *) arg);
2009 case PMC_FN_USER_CALLCHAIN:
2011 * Record a call chain.
2013 KASSERT(td == curthread, ("[pmc,%d] td != curthread",
2016 pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_HR,
2017 (struct trapframe *) arg);
2018 td->td_pflags &= ~TDP_CALLCHAIN;
2021 case PMC_FN_USER_CALLCHAIN_SOFT:
2023 * Record a call chain.
2025 KASSERT(td == curthread, ("[pmc,%d] td != curthread",
2027 pmc_capture_user_callchain(PCPU_GET(cpuid), PMC_SR,
2028 (struct trapframe *) arg);
2029 td->td_pflags &= ~TDP_CALLCHAIN;
2032 case PMC_FN_SOFT_SAMPLING:
2034 * Call soft PMC sampling intr.
2036 pmc_soft_intr((struct pmckern_soft *) arg);
2041 KASSERT(0, ("[pmc,%d] unknown hook %d\n", __LINE__, function));
2051 * allocate a 'struct pmc_owner' descriptor in the owner hash table.
2054 static struct pmc_owner *
2055 pmc_allocate_owner_descriptor(struct proc *p)
2058 struct pmc_owner *po;
2059 struct pmc_ownerhash *poh;
2061 hindex = PMC_HASH_PTR(p, pmc_ownerhashmask);
2062 poh = &pmc_ownerhash[hindex];
2064 /* allocate space for N pointers and one descriptor struct */
2065 po = malloc(sizeof(struct pmc_owner), M_PMC, M_WAITOK|M_ZERO);
2067 LIST_INSERT_HEAD(poh, po, po_next); /* insert into hash table */
2069 TAILQ_INIT(&po->po_logbuffers);
2070 mtx_init(&po->po_mtx, "pmc-owner-mtx", "pmc-per-proc", MTX_SPIN);
2072 PMCDBG4(OWN,ALL,1, "allocate-owner proc=%p (%d, %s) pmc-owner=%p",
2073 p, p->p_pid, p->p_comm, po);
2079 pmc_destroy_owner_descriptor(struct pmc_owner *po)
2082 PMCDBG4(OWN,REL,1, "destroy-owner po=%p proc=%p (%d, %s)",
2083 po, po->po_owner, po->po_owner->p_pid, po->po_owner->p_comm);
2085 mtx_destroy(&po->po_mtx);
2090 * find the descriptor corresponding to process 'p', adding or removing it
2091 * as specified by 'mode'.
2094 static struct pmc_process *
2095 pmc_find_process_descriptor(struct proc *p, uint32_t mode)
2098 struct pmc_process *pp, *ppnew;
2099 struct pmc_processhash *pph;
2101 hindex = PMC_HASH_PTR(p, pmc_processhashmask);
2102 pph = &pmc_processhash[hindex];
2107 * Pre-allocate memory in the FIND_ALLOCATE case since we
2108 * cannot call malloc(9) once we hold a spin lock.
2110 if (mode & PMC_FLAG_ALLOCATE)
2111 ppnew = malloc(sizeof(struct pmc_process) + md->pmd_npmc *
2112 sizeof(struct pmc_targetstate), M_PMC, M_WAITOK|M_ZERO);
2114 mtx_lock_spin(&pmc_processhash_mtx);
2115 LIST_FOREACH(pp, pph, pp_next)
2116 if (pp->pp_proc == p)
2119 if ((mode & PMC_FLAG_REMOVE) && pp != NULL)
2120 LIST_REMOVE(pp, pp_next);
2122 if ((mode & PMC_FLAG_ALLOCATE) && pp == NULL &&
2125 LIST_INSERT_HEAD(pph, ppnew, pp_next);
2129 mtx_unlock_spin(&pmc_processhash_mtx);
2131 if (pp != NULL && ppnew != NULL)
2138 * remove a process descriptor from the process hash table.
2142 pmc_remove_process_descriptor(struct pmc_process *pp)
2144 KASSERT(pp->pp_refcnt == 0,
2145 ("[pmc,%d] Removing process descriptor %p with count %d",
2146 __LINE__, pp, pp->pp_refcnt));
2148 mtx_lock_spin(&pmc_processhash_mtx);
2149 LIST_REMOVE(pp, pp_next);
2150 mtx_unlock_spin(&pmc_processhash_mtx);
2155 * find an owner descriptor corresponding to proc 'p'
2158 static struct pmc_owner *
2159 pmc_find_owner_descriptor(struct proc *p)
2162 struct pmc_owner *po;
2163 struct pmc_ownerhash *poh;
2165 hindex = PMC_HASH_PTR(p, pmc_ownerhashmask);
2166 poh = &pmc_ownerhash[hindex];
2169 LIST_FOREACH(po, poh, po_next)
2170 if (po->po_owner == p)
2173 PMCDBG5(OWN,FND,1, "find-owner proc=%p (%d, %s) hindex=0x%x -> "
2174 "pmc-owner=%p", p, p->p_pid, p->p_comm, hindex, po);
2180 * pmc_allocate_pmc_descriptor
2182 * Allocate a pmc descriptor and initialize its
2187 pmc_allocate_pmc_descriptor(void)
2191 pmc = malloc(sizeof(struct pmc), M_PMC, M_WAITOK|M_ZERO);
2193 PMCDBG1(PMC,ALL,1, "allocate-pmc -> pmc=%p", pmc);
2199 * Destroy a pmc descriptor.
2203 pmc_destroy_pmc_descriptor(struct pmc *pm)
2206 KASSERT(pm->pm_state == PMC_STATE_DELETED ||
2207 pm->pm_state == PMC_STATE_FREE,
2208 ("[pmc,%d] destroying non-deleted PMC", __LINE__));
2209 KASSERT(LIST_EMPTY(&pm->pm_targets),
2210 ("[pmc,%d] destroying pmc with targets", __LINE__));
2211 KASSERT(pm->pm_owner == NULL,
2212 ("[pmc,%d] destroying pmc attached to an owner", __LINE__));
2213 KASSERT(pm->pm_runcount == 0,
2214 ("[pmc,%d] pmc has non-zero run count %d", __LINE__,
2221 pmc_wait_for_pmc_idle(struct pmc *pm)
2224 volatile int maxloop;
2226 maxloop = 100 * pmc_cpu_max();
2229 * Loop (with a forced context switch) till the PMC's runcount
2230 * comes down to zero.
2232 while (atomic_load_acq_32(&pm->pm_runcount) > 0) {
2235 KASSERT(maxloop > 0,
2236 ("[pmc,%d] (ri%d, rc%d) waiting too long for "
2237 "pmc to be free", __LINE__,
2238 PMC_TO_ROWINDEX(pm), pm->pm_runcount));
2240 pmc_force_context_switch();
2245 * This function does the following things:
2247 * - detaches the PMC from hardware
2248 * - unlinks all target threads that were attached to it
2249 * - removes the PMC from its owner's list
2250 * - destroys the PMC private mutex
2252 * Once this function completes, the given pmc pointer can be freed by
2253 * calling pmc_destroy_pmc_descriptor().
2257 pmc_release_pmc_descriptor(struct pmc *pm)
2261 u_int adjri, ri, cpu;
2262 struct pmc_owner *po;
2263 struct pmc_binding pb;
2264 struct pmc_process *pp;
2265 struct pmc_classdep *pcd;
2266 struct pmc_target *ptgt, *tmp;
2268 sx_assert(&pmc_sx, SX_XLOCKED);
2270 KASSERT(pm, ("[pmc,%d] null pmc", __LINE__));
2272 ri = PMC_TO_ROWINDEX(pm);
2273 pcd = pmc_ri_to_classdep(md, ri, &adjri);
2274 mode = PMC_TO_MODE(pm);
2276 PMCDBG3(PMC,REL,1, "release-pmc pmc=%p ri=%d mode=%d", pm, ri,
2280 * First, we take the PMC off hardware.
2283 if (PMC_IS_SYSTEM_MODE(mode)) {
2286 * A system mode PMC runs on a specific CPU. Switch
2287 * to this CPU and turn hardware off.
2289 pmc_save_cpu_binding(&pb);
2291 cpu = PMC_TO_CPU(pm);
2293 pmc_select_cpu(cpu);
2295 /* switch off non-stalled CPUs */
2296 CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate);
2297 if (pm->pm_state == PMC_STATE_RUNNING &&
2298 !CPU_ISSET(cpu, &pm->pm_stalled)) {
2300 phw = pmc_pcpu[cpu]->pc_hwpmcs[ri];
2302 KASSERT(phw->phw_pmc == pm,
2303 ("[pmc, %d] pmc ptr ri(%d) hw(%p) pm(%p)",
2304 __LINE__, ri, phw->phw_pmc, pm));
2305 PMCDBG2(PMC,REL,2, "stopping cpu=%d ri=%d", cpu, ri);
2308 pcd->pcd_stop_pmc(cpu, adjri);
2312 PMCDBG2(PMC,REL,2, "decfg cpu=%d ri=%d", cpu, ri);
2315 pcd->pcd_config_pmc(cpu, adjri, NULL);
2318 /* adjust the global and process count of SS mode PMCs */
2319 if (mode == PMC_MODE_SS && pm->pm_state == PMC_STATE_RUNNING) {
2322 if (po->po_sscount == 0) {
2323 atomic_subtract_rel_int(&pmc_ss_count, 1);
2324 LIST_REMOVE(po, po_ssnext);
2328 pm->pm_state = PMC_STATE_DELETED;
2330 pmc_restore_cpu_binding(&pb);
2333 * We could have references to this PMC structure in
2334 * the per-cpu sample queues. Wait for the queue to
2337 pmc_wait_for_pmc_idle(pm);
2339 } else if (PMC_IS_VIRTUAL_MODE(mode)) {
2342 * A virtual PMC could be running on multiple CPUs at
2345 * By marking its state as DELETED, we ensure that
2346 * this PMC is never further scheduled on hardware.
2348 * Then we wait till all CPUs are done with this PMC.
2350 pm->pm_state = PMC_STATE_DELETED;
2353 /* Wait for the PMCs runcount to come to zero. */
2354 pmc_wait_for_pmc_idle(pm);
2357 * At this point the PMC is off all CPUs and cannot be
2358 * freshly scheduled onto a CPU. It is now safe to
2359 * unlink all targets from this PMC. If a
2360 * process-record's refcount falls to zero, we remove
2361 * it from the hash table. The module-wide SX lock
2362 * protects us from races.
2364 LIST_FOREACH_SAFE(ptgt, &pm->pm_targets, pt_next, tmp) {
2365 pp = ptgt->pt_process;
2366 pmc_unlink_target_process(pm, pp); /* frees 'ptgt' */
2368 PMCDBG1(PMC,REL,3, "pp->refcnt=%d", pp->pp_refcnt);
2371 * If the target process record shows that no
2372 * PMCs are attached to it, reclaim its space.
2375 if (pp->pp_refcnt == 0) {
2376 pmc_remove_process_descriptor(pp);
2381 cpu = curthread->td_oncpu; /* setup cpu for pmd_release() */
2386 * Release any MD resources
2388 (void) pcd->pcd_release_pmc(cpu, adjri, pm);
2391 * Update row disposition
2394 if (PMC_IS_SYSTEM_MODE(PMC_TO_MODE(pm)))
2395 PMC_UNMARK_ROW_STANDALONE(ri);
2397 PMC_UNMARK_ROW_THREAD(ri);
2399 /* unlink from the owner's list */
2401 LIST_REMOVE(pm, pm_next);
2402 pm->pm_owner = NULL;
2407 * Register an owner and a pmc.
2411 pmc_register_owner(struct proc *p, struct pmc *pmc)
2413 struct pmc_owner *po;
2415 sx_assert(&pmc_sx, SX_XLOCKED);
2417 if ((po = pmc_find_owner_descriptor(p)) == NULL)
2418 if ((po = pmc_allocate_owner_descriptor(p)) == NULL)
2421 KASSERT(pmc->pm_owner == NULL,
2422 ("[pmc,%d] attempting to own an initialized PMC", __LINE__));
2425 LIST_INSERT_HEAD(&po->po_pmcs, pmc, pm_next);
2428 p->p_flag |= P_HWPMC;
2431 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
2432 pmclog_process_pmcallocate(pmc);
2434 PMCDBG2(PMC,REG,1, "register-owner pmc-owner=%p pmc=%p",
2441 * Return the current row disposition:
2443 * > 0 => PROCESS MODE
2444 * < 0 => SYSTEM MODE
2448 pmc_getrowdisp(int ri)
2450 return pmc_pmcdisp[ri];
2454 * Check if a PMC at row index 'ri' can be allocated to the current
2457 * Allocation can fail if:
2458 * - the current process is already being profiled by a PMC at index 'ri',
2459 * attached to it via OP_PMCATTACH.
2460 * - the current process has already allocated a PMC at index 'ri'
2465 pmc_can_allocate_rowindex(struct proc *p, unsigned int ri, int cpu)
2469 struct pmc_owner *po;
2470 struct pmc_process *pp;
2472 PMCDBG5(PMC,ALR,1, "can-allocate-rowindex proc=%p (%d, %s) ri=%d "
2473 "cpu=%d", p, p->p_pid, p->p_comm, ri, cpu);
2476 * We shouldn't have already allocated a process-mode PMC at
2479 * We shouldn't have allocated a system-wide PMC on the same
2482 if ((po = pmc_find_owner_descriptor(p)) != NULL)
2483 LIST_FOREACH(pm, &po->po_pmcs, pm_next) {
2484 if (PMC_TO_ROWINDEX(pm) == ri) {
2485 mode = PMC_TO_MODE(pm);
2486 if (PMC_IS_VIRTUAL_MODE(mode))
2488 if (PMC_IS_SYSTEM_MODE(mode) &&
2489 (int) PMC_TO_CPU(pm) == cpu)
2495 * We also shouldn't be the target of any PMC at this index
2496 * since otherwise a PMC_ATTACH to ourselves will fail.
2498 if ((pp = pmc_find_process_descriptor(p, 0)) != NULL)
2499 if (pp->pp_pmcs[ri].pp_pmc)
2502 PMCDBG4(PMC,ALR,2, "can-allocate-rowindex proc=%p (%d, %s) ri=%d ok",
2503 p, p->p_pid, p->p_comm, ri);
2509 * Check if a given PMC at row index 'ri' can be currently used in
2514 pmc_can_allocate_row(int ri, enum pmc_mode mode)
2518 sx_assert(&pmc_sx, SX_XLOCKED);
2520 PMCDBG2(PMC,ALR,1, "can-allocate-row ri=%d mode=%d", ri, mode);
2522 if (PMC_IS_SYSTEM_MODE(mode))
2523 disp = PMC_DISP_STANDALONE;
2525 disp = PMC_DISP_THREAD;
2528 * check disposition for PMC row 'ri':
2530 * Expected disposition Row-disposition Result
2532 * STANDALONE STANDALONE or FREE proceed
2533 * STANDALONE THREAD fail
2534 * THREAD THREAD or FREE proceed
2535 * THREAD STANDALONE fail
2538 if (!PMC_ROW_DISP_IS_FREE(ri) &&
2539 !(disp == PMC_DISP_THREAD && PMC_ROW_DISP_IS_THREAD(ri)) &&
2540 !(disp == PMC_DISP_STANDALONE && PMC_ROW_DISP_IS_STANDALONE(ri)))
2547 PMCDBG2(PMC,ALR,2, "can-allocate-row ri=%d mode=%d ok", ri, mode);
2554 * Find a PMC descriptor with user handle 'pmcid' for thread 'td'.
2558 pmc_find_pmc_descriptor_in_process(struct pmc_owner *po, pmc_id_t pmcid)
2562 KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc,
2563 ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__,
2564 PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc));
2566 LIST_FOREACH(pm, &po->po_pmcs, pm_next)
2567 if (pm->pm_id == pmcid)
2574 pmc_find_pmc(pmc_id_t pmcid, struct pmc **pmc)
2577 struct pmc *pm, *opm;
2578 struct pmc_owner *po;
2579 struct pmc_process *pp;
2581 KASSERT(PMC_ID_TO_ROWINDEX(pmcid) < md->pmd_npmc,
2582 ("[pmc,%d] Illegal pmc index %d (max %d)", __LINE__,
2583 PMC_ID_TO_ROWINDEX(pmcid), md->pmd_npmc));
2584 PMCDBG1(PMC,FND,1, "find-pmc id=%d", pmcid);
2586 if ((po = pmc_find_owner_descriptor(curthread->td_proc)) == NULL) {
2588 * In case of PMC_F_DESCENDANTS child processes we will not find
2589 * the current process in the owners hash list. Find the owner
2590 * process first and from there lookup the po.
2592 if ((pp = pmc_find_process_descriptor(curthread->td_proc,
2593 PMC_FLAG_NONE)) == NULL) {
2596 opm = pp->pp_pmcs[PMC_ID_TO_ROWINDEX(pmcid)].pp_pmc;
2599 if ((opm->pm_flags & (PMC_F_ATTACHED_TO_OWNER|
2600 PMC_F_DESCENDANTS)) != (PMC_F_ATTACHED_TO_OWNER|
2607 if ((pm = pmc_find_pmc_descriptor_in_process(po, pmcid)) == NULL)
2610 PMCDBG2(PMC,FND,2, "find-pmc id=%d -> pmc=%p", pmcid, pm);
2621 pmc_start(struct pmc *pm)
2624 struct pmc_owner *po;
2625 struct pmc_binding pb;
2626 struct pmc_classdep *pcd;
2627 int adjri, error, cpu, ri;
2630 ("[pmc,%d] null pm", __LINE__));
2632 mode = PMC_TO_MODE(pm);
2633 ri = PMC_TO_ROWINDEX(pm);
2634 pcd = pmc_ri_to_classdep(md, ri, &adjri);
2638 PMCDBG3(PMC,OPS,1, "start pmc=%p mode=%d ri=%d", pm, mode, ri);
2643 * Disallow PMCSTART if a logfile is required but has not been
2646 if ((pm->pm_flags & PMC_F_NEEDS_LOGFILE) &&
2647 (po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
2648 return (EDOOFUS); /* programming error */
2651 * If this is a sampling mode PMC, log mapping information for
2652 * the kernel modules that are currently loaded.
2654 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm)))
2655 pmc_log_kernel_mappings(pm);
2657 if (PMC_IS_VIRTUAL_MODE(mode)) {
2660 * If a PMCATTACH has never been done on this PMC,
2661 * attach it to its owner process.
2664 if (LIST_EMPTY(&pm->pm_targets))
2665 error = (pm->pm_flags & PMC_F_ATTACH_DONE) ? ESRCH :
2666 pmc_attach_process(po->po_owner, pm);
2669 * If the PMC is attached to its owner, then force a context
2670 * switch to ensure that the MD state gets set correctly.
2674 pm->pm_state = PMC_STATE_RUNNING;
2675 if (pm->pm_flags & PMC_F_ATTACHED_TO_OWNER)
2676 pmc_force_context_switch();
2684 * A system-wide PMC.
2686 * Add the owner to the global list if this is a system-wide
2690 if (mode == PMC_MODE_SS) {
2691 if (po->po_sscount == 0) {
2692 LIST_INSERT_HEAD(&pmc_ss_owners, po, po_ssnext);
2693 atomic_add_rel_int(&pmc_ss_count, 1);
2694 PMCDBG1(PMC,OPS,1, "po=%p in global list", po);
2699 * Log mapping information for all existing processes in the
2700 * system. Subsequent mappings are logged as they happen;
2701 * see pmc_process_mmap().
2703 if (po->po_logprocmaps == 0) {
2704 pmc_log_all_process_mappings(po);
2705 po->po_logprocmaps = 1;
2710 * Move to the CPU associated with this
2711 * PMC, and start the hardware.
2714 pmc_save_cpu_binding(&pb);
2716 cpu = PMC_TO_CPU(pm);
2718 if (!pmc_cpu_is_active(cpu))
2721 pmc_select_cpu(cpu);
2724 * global PMCs are configured at allocation time
2725 * so write out the initial value and start the PMC.
2728 pm->pm_state = PMC_STATE_RUNNING;
2731 if ((error = pcd->pcd_write_pmc(cpu, adjri,
2732 PMC_IS_SAMPLING_MODE(mode) ?
2733 pm->pm_sc.pm_reloadcount :
2734 pm->pm_sc.pm_initial)) == 0) {
2735 /* If a sampling mode PMC, reset stalled state. */
2736 if (PMC_IS_SAMPLING_MODE(mode))
2737 CPU_CLR_ATOMIC(cpu, &pm->pm_stalled);
2739 /* Indicate that we desire this to run. Start it. */
2740 CPU_SET_ATOMIC(cpu, &pm->pm_cpustate);
2741 error = pcd->pcd_start_pmc(cpu, adjri);
2745 pmc_restore_cpu_binding(&pb);
2755 pmc_stop(struct pmc *pm)
2757 struct pmc_owner *po;
2758 struct pmc_binding pb;
2759 struct pmc_classdep *pcd;
2760 int adjri, cpu, error, ri;
2762 KASSERT(pm != NULL, ("[pmc,%d] null pmc", __LINE__));
2764 PMCDBG3(PMC,OPS,1, "stop pmc=%p mode=%d ri=%d", pm,
2765 PMC_TO_MODE(pm), PMC_TO_ROWINDEX(pm));
2767 pm->pm_state = PMC_STATE_STOPPED;
2770 * If the PMC is a virtual mode one, changing the state to
2771 * non-RUNNING is enough to ensure that the PMC never gets
2774 * If this PMC is current running on a CPU, then it will
2775 * handled correctly at the time its target process is context
2779 if (PMC_IS_VIRTUAL_MODE(PMC_TO_MODE(pm)))
2783 * A system-mode PMC. Move to the CPU associated with
2784 * this PMC, and stop the hardware. We update the
2785 * 'initial count' so that a subsequent PMCSTART will
2786 * resume counting from the current hardware count.
2789 pmc_save_cpu_binding(&pb);
2791 cpu = PMC_TO_CPU(pm);
2793 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(),
2794 ("[pmc,%d] illegal cpu=%d", __LINE__, cpu));
2796 if (!pmc_cpu_is_active(cpu))
2799 pmc_select_cpu(cpu);
2801 ri = PMC_TO_ROWINDEX(pm);
2802 pcd = pmc_ri_to_classdep(md, ri, &adjri);
2804 CPU_CLR_ATOMIC(cpu, &pm->pm_cpustate);
2806 if ((error = pcd->pcd_stop_pmc(cpu, adjri)) == 0)
2807 error = pcd->pcd_read_pmc(cpu, adjri, &pm->pm_sc.pm_initial);
2810 pmc_restore_cpu_binding(&pb);
2814 /* remove this owner from the global list of SS PMC owners */
2815 if (PMC_TO_MODE(pm) == PMC_MODE_SS) {
2817 if (po->po_sscount == 0) {
2818 atomic_subtract_rel_int(&pmc_ss_count, 1);
2819 LIST_REMOVE(po, po_ssnext);
2820 PMCDBG1(PMC,OPS,2,"po=%p removed from global list", po);
2829 static const char *pmc_op_to_name[] = {
2831 #define __PMC_OP(N, D) #N ,
2838 * The syscall interface
2841 #define PMC_GET_SX_XLOCK(...) do { \
2842 sx_xlock(&pmc_sx); \
2843 if (pmc_hook == NULL) { \
2844 sx_xunlock(&pmc_sx); \
2845 return __VA_ARGS__; \
2849 #define PMC_DOWNGRADE_SX() do { \
2850 sx_downgrade(&pmc_sx); \
2851 is_sx_downgraded = 1; \
2855 pmc_syscall_handler(struct thread *td, void *syscall_args)
2857 int error, is_sx_downgraded, op;
2858 struct pmc_syscall_args *c;
2859 void *pmclog_proc_handle;
2862 c = (struct pmc_syscall_args *)syscall_args;
2865 if (op == PMC_OP_CONFIGURELOG) {
2867 * We cannot create the logging process inside
2868 * pmclog_configure_log() because there is a LOR
2869 * between pmc_sx and process structure locks.
2870 * Instead, pre-create the process and ignite the loop
2871 * if everything is fine, otherwise direct the process
2874 error = pmclog_proc_create(td, &pmclog_proc_handle);
2879 PMC_GET_SX_XLOCK(ENOSYS);
2880 is_sx_downgraded = 0;
2882 PMCDBG3(MOD,PMS,1, "syscall op=%d \"%s\" arg=%p", op,
2883 pmc_op_to_name[op], arg);
2886 atomic_add_int(&pmc_stats.pm_syscalls, 1);
2892 * Configure a log file.
2894 * XXX This OP will be reworked.
2897 case PMC_OP_CONFIGURELOG:
2901 struct pmc_owner *po;
2902 struct pmc_op_configurelog cl;
2904 if ((error = copyin(arg, &cl, sizeof(cl))) != 0) {
2905 pmclog_proc_ignite(pmclog_proc_handle, NULL);
2909 /* mark this process as owning a log file */
2911 if ((po = pmc_find_owner_descriptor(p)) == NULL)
2912 if ((po = pmc_allocate_owner_descriptor(p)) == NULL) {
2913 pmclog_proc_ignite(pmclog_proc_handle, NULL);
2919 * If a valid fd was passed in, try to configure that,
2920 * otherwise if 'fd' was less than zero and there was
2921 * a log file configured, flush its buffers and
2924 if (cl.pm_logfd >= 0) {
2925 error = pmclog_configure_log(md, po, cl.pm_logfd);
2926 pmclog_proc_ignite(pmclog_proc_handle, error == 0 ?
2928 } else if (po->po_flags & PMC_PO_OWNS_LOGFILE) {
2929 pmclog_proc_ignite(pmclog_proc_handle, NULL);
2930 pmclog_process_closelog(po);
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");