1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005-2007 Joseph Koshy
5 * Copyright (c) 2007 The FreeBSD Foundation
6 * Copyright (c) 2018 Matthew Macy
7 * All rights reserved.
8 *
9 * Portions of this software were developed by A. Joseph Koshy under
10 * sponsorship from the FreeBSD Foundation and Google, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 */
34
35 /*
36 * Logging code for hwpmc(4)
37 */
38
39 #include <sys/param.h>
40 #include <sys/capsicum.h>
41 #include <sys/domainset.h>
42 #include <sys/file.h>
43 #include <sys/kernel.h>
44 #include <sys/kthread.h>
45 #include <sys/lock.h>
46 #include <sys/module.h>
47 #include <sys/mutex.h>
48 #include <sys/pmc.h>
49 #include <sys/pmckern.h>
50 #include <sys/pmclog.h>
51 #include <sys/proc.h>
52 #include <sys/sched.h>
53 #include <sys/signalvar.h>
54 #include <sys/smp.h>
55 #include <sys/syscallsubr.h>
56 #include <sys/sysctl.h>
57 #include <sys/systm.h>
58 #include <sys/uio.h>
59 #include <sys/unistd.h>
60 #include <sys/vnode.h>
61
62 #if defined(__i386__) || defined(__amd64__)
63 #include <machine/clock.h>
64 #endif
65
66 #define curdomain PCPU_GET(domain)
67
68 /*
69 * Sysctl tunables
70 */
71
72 SYSCTL_DECL(_kern_hwpmc);
73
74 /*
75 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers.
76 */
77
78 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
79 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN,
80 &pmclog_buffer_size, 0, "size of log buffers in kilobytes");
81
82 /*
83 * kern.hwpmc.nbuffers_pcpu -- number of global log buffers
84 */
85
86 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
87 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN,
88 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu");
89
90 /*
91 * Global log buffer list and associated spin lock.
92 */
93
94 static struct mtx pmc_kthread_mtx; /* sleep lock */
95
96 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \
97 (D)->plb_fence = ((char *)(buf)) + 1024 * pmclog_buffer_size; \
98 (D)->plb_base = (D)->plb_ptr = ((char *)(buf)); \
99 (D)->plb_domain = domain; \
100 } while (0)
101
102 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \
103 (D)->plb_ptr = (D)->plb_base; \
104 } while (0)
105
106 /*
107 * Log file record constructors.
108 */
109 #define _PMCLOG_TO_HEADER(T, L) \
110 ((PMCLOG_HEADER_MAGIC << 24) | (T << 16) | ((L) & 0xFFFF))
111
112 /* reserve LEN bytes of space and initialize the entry header */
113 #define _PMCLOG_RESERVE_SAFE(PO, TYPE, LEN, ACTION, TSC) do { \
114 uint32_t *_le; \
115 int _len = roundup((LEN), sizeof(uint32_t)); \
116 struct pmclog_header *ph; \
117 \
118 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
119 ACTION; \
120 } \
121 ph = (struct pmclog_header *)_le; \
122 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \
123 ph->pl_tsc = (TSC); \
124 _le += sizeof(*ph) / 4 /* skip over timestamp */
125
126 /* reserve LEN bytes of space and initialize the entry header */
127 #define _PMCLOG_RESERVE(PO, TYPE, LEN, ACTION) do { \
128 uint32_t *_le; \
129 int _len = roundup((LEN), sizeof(uint32_t)); \
130 uint64_t tsc; \
131 struct pmclog_header *ph; \
132 \
133 tsc = pmc_rdtsc(); \
134 spinlock_enter(); \
135 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
136 spinlock_exit(); \
137 ACTION; \
138 } \
139 ph = (struct pmclog_header *)_le; \
140 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \
141 ph->pl_tsc = tsc; \
142 _le += sizeof(*ph) / 4 /* skip over timestamp */
143
144 #define PMCLOG_RESERVE_SAFE(P, T, L, TSC) \
145 _PMCLOG_RESERVE_SAFE(P, T, L, return, TSC)
146 #define PMCLOG_RESERVE(P,T,L) \
147 _PMCLOG_RESERVE(P, T, L, return)
148 #define PMCLOG_RESERVE_WITH_ERROR(P, T, L) \
149 _PMCLOG_RESERVE(P, T, L, error = ENOMEM; goto error)
150
151 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0)
152 #define PMCLOG_EMIT64(V) do { \
153 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \
154 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \
155 } while (0)
156
157
158 /* Emit a string. Caution: does NOT update _le, so needs to be last */
159 #define PMCLOG_EMITSTRING(S,L) do { \
160 bcopy((S), _le, (L)); \
161 } while (0)
162 #define PMCLOG_EMITNULLSTRING(L) do { \
163 bzero(_le, (L)); \
164 } while (0)
165
166 #define PMCLOG_DESPATCH_SAFE(PO) \
167 pmclog_release((PO)); \
168 } while (0)
169
170 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \
171 pmclog_release_flags((PO), 0); \
172 } while (0)
173
174 #define PMCLOG_DESPATCH(PO) \
175 pmclog_release((PO)); \
176 spinlock_exit(); \
177 } while (0)
178
179 #define PMCLOG_DESPATCH_SYNC(PO) \
180 pmclog_schedule_io((PO), 1); \
181 spinlock_exit(); \
182 } while (0)
183
184 #define TSDELTA 4
185 /*
186 * Assertions about the log file format.
187 */
188 CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA +
189 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t));
190 CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA);
191 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA);
192 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA +
193 5*4 + sizeof(uintfptr_t));
194 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) ==
195 5*4 + TSDELTA + sizeof(uintfptr_t));
196 CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA);
197 CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA);
198 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA);
199 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA);
200 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA);
201 CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA);
202 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX +
203 2*sizeof(uintptr_t) + TSDELTA);
204 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA +
205 2*sizeof(uintptr_t));
206 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA);
207 CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA);
208 CTASSERT(sizeof(struct pmclog_sysexit) == 6*4);
209 CTASSERT(sizeof(struct pmclog_userdata) == 6*4);
210
211 /*
212 * Log buffer structure
213 */
214
215 struct pmclog_buffer {
216 TAILQ_ENTRY(pmclog_buffer) plb_next;
217 char *plb_base;
218 char *plb_ptr;
219 char *plb_fence;
220 uint16_t plb_domain;
221 } __aligned(CACHE_LINE_SIZE);
222
223 /*
224 * Prototypes
225 */
226
227 static int pmclog_get_buffer(struct pmc_owner *po);
228 static void pmclog_loop(void *arg);
229 static void pmclog_release(struct pmc_owner *po);
230 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length);
231 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup);
232 static void pmclog_schedule_all(struct pmc_owner *po);
233 static void pmclog_stop_kthread(struct pmc_owner *po);
234
235 /*
236 * Helper functions
237 */
238
239 static inline void
pmc_plb_rele_unlocked(struct pmclog_buffer * plb)240 pmc_plb_rele_unlocked(struct pmclog_buffer *plb)
241 {
242 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next);
243 }
244
245 static inline void
pmc_plb_rele(struct pmclog_buffer * plb)246 pmc_plb_rele(struct pmclog_buffer *plb)
247 {
248 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx);
249 pmc_plb_rele_unlocked(plb);
250 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx);
251 }
252
253 /*
254 * Get a log buffer
255 */
256 static int
pmclog_get_buffer(struct pmc_owner * po)257 pmclog_get_buffer(struct pmc_owner *po)
258 {
259 struct pmclog_buffer *plb;
260 int domain;
261
262 KASSERT(po->po_curbuf[curcpu] == NULL,
263 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po));
264
265 domain = curdomain;
266 MPASS(pmc_dom_hdrs[domain]);
267 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx);
268 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL)
269 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next);
270 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx);
271
272 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb);
273
274 #ifdef HWPMC_DEBUG
275 if (plb)
276 KASSERT(plb->plb_ptr == plb->plb_base &&
277 plb->plb_base < plb->plb_fence,
278 ("[pmclog,%d] po=%p buffer invariants: ptr=%p "
279 "base=%p fence=%p", __LINE__, po, plb->plb_ptr,
280 plb->plb_base, plb->plb_fence));
281 #endif
282
283 po->po_curbuf[curcpu] = plb;
284
285 /* update stats */
286 counter_u64_add(pmc_stats.pm_buffer_requests, 1);
287 if (plb == NULL)
288 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1);
289
290 return (plb ? 0 : ENOMEM);
291 }
292
293 struct pmclog_proc_init_args {
294 struct proc *kthr;
295 struct pmc_owner *po;
296 bool exit;
297 bool acted;
298 };
299
300 int
pmclog_proc_create(struct thread * td,void ** handlep)301 pmclog_proc_create(struct thread *td, void **handlep)
302 {
303 struct pmclog_proc_init_args *ia;
304 int error;
305
306 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO);
307 error = kproc_create(pmclog_loop, ia, &ia->kthr,
308 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid);
309 if (error == 0)
310 *handlep = ia;
311 return (error);
312 }
313
314 void
pmclog_proc_ignite(void * handle,struct pmc_owner * po)315 pmclog_proc_ignite(void *handle, struct pmc_owner *po)
316 {
317 struct pmclog_proc_init_args *ia;
318
319 ia = handle;
320 mtx_lock(&pmc_kthread_mtx);
321 MPASS(!ia->acted);
322 MPASS(ia->po == NULL);
323 MPASS(!ia->exit);
324 MPASS(ia->kthr != NULL);
325 if (po == NULL) {
326 ia->exit = true;
327 } else {
328 ia->po = po;
329 KASSERT(po->po_kthread == NULL,
330 ("[pmclog,%d] po=%p kthread (%p) already present",
331 __LINE__, po, po->po_kthread));
332 po->po_kthread = ia->kthr;
333 }
334 wakeup(ia);
335 while (!ia->acted)
336 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0);
337 mtx_unlock(&pmc_kthread_mtx);
338 free(ia, M_TEMP);
339 }
340
341 /*
342 * Log handler loop.
343 *
344 * This function is executed by each pmc owner's helper thread.
345 */
346 static void
pmclog_loop(void * arg)347 pmclog_loop(void *arg)
348 {
349 struct pmclog_proc_init_args *ia;
350 struct pmc_owner *po;
351 struct pmclog_buffer *lb;
352 struct proc *p;
353 struct ucred *ownercred;
354 struct ucred *mycred;
355 struct thread *td;
356 sigset_t unb;
357 struct uio auio;
358 struct iovec aiov;
359 size_t nbytes;
360 int error;
361
362 td = curthread;
363
364 SIGEMPTYSET(unb);
365 SIGADDSET(unb, SIGHUP);
366 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0);
367
368 ia = arg;
369 MPASS(ia->kthr == curproc);
370 MPASS(!ia->acted);
371 mtx_lock(&pmc_kthread_mtx);
372 while (ia->po == NULL && !ia->exit)
373 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0);
374 if (ia->exit) {
375 ia->acted = true;
376 wakeup(ia);
377 mtx_unlock(&pmc_kthread_mtx);
378 kproc_exit(0);
379 }
380 MPASS(ia->po != NULL);
381 po = ia->po;
382 ia->acted = true;
383 wakeup(ia);
384 mtx_unlock(&pmc_kthread_mtx);
385 ia = NULL;
386
387 p = po->po_owner;
388 mycred = td->td_ucred;
389
390 PROC_LOCK(p);
391 ownercred = crhold(p->p_ucred);
392 PROC_UNLOCK(p);
393
394 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread);
395 KASSERT(po->po_kthread == curthread->td_proc,
396 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__,
397 po, po->po_kthread, curthread->td_proc));
398
399 lb = NULL;
400
401
402 /*
403 * Loop waiting for I/O requests to be added to the owner
404 * struct's queue. The loop is exited when the log file
405 * is deconfigured.
406 */
407
408 mtx_lock(&pmc_kthread_mtx);
409
410 for (;;) {
411
412 /* check if we've been asked to exit */
413 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
414 break;
415
416 if (lb == NULL) { /* look for a fresh buffer to write */
417 mtx_lock_spin(&po->po_mtx);
418 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) {
419 mtx_unlock_spin(&po->po_mtx);
420
421 /* No more buffers and shutdown required. */
422 if (po->po_flags & PMC_PO_SHUTDOWN)
423 break;
424
425 (void) msleep(po, &pmc_kthread_mtx, PWAIT,
426 "pmcloop", 250);
427 continue;
428 }
429
430 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
431 mtx_unlock_spin(&po->po_mtx);
432 }
433
434 mtx_unlock(&pmc_kthread_mtx);
435
436 /* process the request */
437 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po,
438 lb->plb_base, lb->plb_ptr);
439 /* change our thread's credentials before issuing the I/O */
440
441 aiov.iov_base = lb->plb_base;
442 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base;
443
444 auio.uio_iov = &aiov;
445 auio.uio_iovcnt = 1;
446 auio.uio_offset = -1;
447 auio.uio_resid = nbytes;
448 auio.uio_rw = UIO_WRITE;
449 auio.uio_segflg = UIO_SYSSPACE;
450 auio.uio_td = td;
451
452 /* switch thread credentials -- see kern_ktrace.c */
453 td->td_ucred = ownercred;
454 error = fo_write(po->po_file, &auio, ownercred, 0, td);
455 td->td_ucred = mycred;
456
457 if (error) {
458 /* XXX some errors are recoverable */
459 /* send a SIGIO to the owner and exit */
460 PROC_LOCK(p);
461 kern_psignal(p, SIGIO);
462 PROC_UNLOCK(p);
463
464 mtx_lock(&pmc_kthread_mtx);
465
466 po->po_error = error; /* save for flush log */
467
468 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error);
469
470 break;
471 }
472
473 mtx_lock(&pmc_kthread_mtx);
474
475 /* put the used buffer back into the global pool */
476 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
477
478 pmc_plb_rele(lb);
479 lb = NULL;
480 }
481
482 wakeup_one(po->po_kthread);
483 po->po_kthread = NULL;
484
485 mtx_unlock(&pmc_kthread_mtx);
486
487 /* return the current I/O buffer to the global pool */
488 if (lb) {
489 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
490
491 pmc_plb_rele(lb);
492 }
493
494 /*
495 * Exit this thread, signalling the waiter
496 */
497
498 crfree(ownercred);
499
500 kproc_exit(0);
501 }
502
503 /*
504 * Release and log entry and schedule an I/O if needed.
505 */
506
507 static void
pmclog_release_flags(struct pmc_owner * po,int wakeup)508 pmclog_release_flags(struct pmc_owner *po, int wakeup)
509 {
510 struct pmclog_buffer *plb;
511
512 plb = po->po_curbuf[curcpu];
513 KASSERT(plb->plb_ptr >= plb->plb_base,
514 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
515 po, plb->plb_ptr, plb->plb_base));
516 KASSERT(plb->plb_ptr <= plb->plb_fence,
517 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
518 po, plb->plb_ptr, plb->plb_fence));
519
520 /* schedule an I/O if we've filled a buffer */
521 if (plb->plb_ptr >= plb->plb_fence)
522 pmclog_schedule_io(po, wakeup);
523
524 PMCDBG1(LOG,REL,1, "po=%p", po);
525 }
526
527 static void
pmclog_release(struct pmc_owner * po)528 pmclog_release(struct pmc_owner *po)
529 {
530
531 pmclog_release_flags(po, 1);
532 }
533
534
535 /*
536 * Attempt to reserve 'length' bytes of space in an owner's log
537 * buffer. The function returns a pointer to 'length' bytes of space
538 * if there was enough space or returns NULL if no space was
539 * available. Non-null returns do so with the po mutex locked. The
540 * caller must invoke pmclog_release() on the pmc owner structure
541 * when done.
542 */
543
544 static uint32_t *
pmclog_reserve(struct pmc_owner * po,int length)545 pmclog_reserve(struct pmc_owner *po, int length)
546 {
547 uintptr_t newptr, oldptr __diagused;
548 struct pmclog_buffer *plb, **pplb;
549
550 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length);
551
552 KASSERT(length % sizeof(uint32_t) == 0,
553 ("[pmclog,%d] length not a multiple of word size", __LINE__));
554
555 /* No more data when shutdown in progress. */
556 if (po->po_flags & PMC_PO_SHUTDOWN)
557 return (NULL);
558
559 pplb = &po->po_curbuf[curcpu];
560 if (*pplb == NULL && pmclog_get_buffer(po) != 0)
561 goto fail;
562
563 KASSERT(*pplb != NULL,
564 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
565
566 plb = *pplb;
567 KASSERT(plb->plb_ptr >= plb->plb_base &&
568 plb->plb_ptr <= plb->plb_fence,
569 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
570 __LINE__, po, plb->plb_ptr, plb->plb_base,
571 plb->plb_fence));
572
573 oldptr = (uintptr_t) plb->plb_ptr;
574 newptr = oldptr + length;
575
576 KASSERT(oldptr != (uintptr_t) NULL,
577 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po));
578
579 /*
580 * If we have space in the current buffer, return a pointer to
581 * available space with the PO structure locked.
582 */
583 if (newptr <= (uintptr_t) plb->plb_fence) {
584 plb->plb_ptr = (char *) newptr;
585 goto done;
586 }
587
588 /*
589 * Otherwise, schedule the current buffer for output and get a
590 * fresh buffer.
591 */
592 pmclog_schedule_io(po, 0);
593
594 if (pmclog_get_buffer(po) != 0)
595 goto fail;
596
597 plb = *pplb;
598 KASSERT(plb != NULL,
599 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
600
601 KASSERT(plb->plb_ptr != NULL,
602 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__));
603
604 KASSERT(plb->plb_ptr == plb->plb_base &&
605 plb->plb_ptr <= plb->plb_fence,
606 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
607 __LINE__, po, plb->plb_ptr, plb->plb_base,
608 plb->plb_fence));
609
610 oldptr = (uintptr_t) plb->plb_ptr;
611
612 done:
613 return ((uint32_t *) oldptr);
614 fail:
615 return (NULL);
616 }
617
618 /*
619 * Schedule an I/O.
620 *
621 * Transfer the current buffer to the helper kthread.
622 */
623
624 static void
pmclog_schedule_io(struct pmc_owner * po,int wakeup)625 pmclog_schedule_io(struct pmc_owner *po, int wakeup)
626 {
627 struct pmclog_buffer *plb;
628
629 plb = po->po_curbuf[curcpu];
630 po->po_curbuf[curcpu] = NULL;
631 KASSERT(plb != NULL,
632 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po));
633 KASSERT(plb->plb_ptr >= plb->plb_base,
634 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
635 po, plb->plb_ptr, plb->plb_base));
636 KASSERT(plb->plb_ptr <= plb->plb_fence,
637 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
638 po, plb->plb_ptr, plb->plb_fence));
639
640 PMCDBG1(LOG,SIO, 1, "po=%p", po);
641
642 /*
643 * Add the current buffer to the tail of the buffer list and
644 * wakeup the helper.
645 */
646 mtx_lock_spin(&po->po_mtx);
647 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next);
648 mtx_unlock_spin(&po->po_mtx);
649 if (wakeup)
650 wakeup_one(po);
651 }
652
653 /*
654 * Stop the helper kthread.
655 */
656
657 static void
pmclog_stop_kthread(struct pmc_owner * po)658 pmclog_stop_kthread(struct pmc_owner *po)
659 {
660
661 mtx_lock(&pmc_kthread_mtx);
662 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
663 if (po->po_kthread != NULL) {
664 PROC_LOCK(po->po_kthread);
665 kern_psignal(po->po_kthread, SIGHUP);
666 PROC_UNLOCK(po->po_kthread);
667 }
668 wakeup_one(po);
669 while (po->po_kthread)
670 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0);
671 mtx_unlock(&pmc_kthread_mtx);
672 }
673
674 /*
675 * Public functions
676 */
677
678 /*
679 * Configure a log file for pmc owner 'po'.
680 *
681 * Parameter 'logfd' is a file handle referencing an open file in the
682 * owner process. This file needs to have been opened for writing.
683 */
684
685 int
pmclog_configure_log(struct pmc_mdep * md,struct pmc_owner * po,int logfd)686 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd)
687 {
688 struct proc *p;
689 struct timespec ts;
690 int error;
691
692 sx_assert(&pmc_sx, SA_XLOCKED);
693 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd);
694
695 p = po->po_owner;
696
697 /* return EBUSY if a log file was already present */
698 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
699 return (EBUSY);
700
701 KASSERT(po->po_file == NULL,
702 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po,
703 po->po_file));
704
705 /* get a reference to the file state */
706 error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file);
707 if (error)
708 goto error;
709
710 /* mark process as owning a log file */
711 po->po_flags |= PMC_PO_OWNS_LOGFILE;
712
713 /* mark process as using HWPMCs */
714 PROC_LOCK(p);
715 p->p_flag |= P_HWPMC;
716 PROC_UNLOCK(p);
717 nanotime(&ts);
718 /* create a log initialization entry */
719 PMCLOG_RESERVE_WITH_ERROR(po, PMCLOG_TYPE_INITIALIZE,
720 sizeof(struct pmclog_initialize));
721 PMCLOG_EMIT32(PMC_VERSION);
722 PMCLOG_EMIT32(md->pmd_cputype);
723 #if defined(__i386__) || defined(__amd64__)
724 PMCLOG_EMIT64(tsc_freq);
725 #else
726 /* other architectures will need to fill this in */
727 PMCLOG_EMIT32(0);
728 PMCLOG_EMIT32(0);
729 #endif
730 memcpy(_le, &ts, sizeof(ts));
731 _le += sizeof(ts)/4;
732 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN);
733 PMCLOG_DESPATCH_SYNC(po);
734
735 return (0);
736
737 error:
738 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not "
739 "stopped", __LINE__, po));
740
741 if (po->po_file)
742 (void) fdrop(po->po_file, curthread);
743 po->po_file = NULL; /* clear file and error state */
744 po->po_error = 0;
745 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
746
747 return (error);
748 }
749
750
751 /*
752 * De-configure a log file. This will throw away any buffers queued
753 * for this owner process.
754 */
755
756 int
pmclog_deconfigure_log(struct pmc_owner * po)757 pmclog_deconfigure_log(struct pmc_owner *po)
758 {
759 int error;
760 struct pmclog_buffer *lb;
761 struct pmc_binding pb;
762
763 PMCDBG1(LOG,CFG,1, "de-config po=%p", po);
764
765 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
766 return (EINVAL);
767
768 KASSERT(po->po_sscount == 0,
769 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po));
770 KASSERT(po->po_file != NULL,
771 ("[pmclog,%d] po=%p no log file", __LINE__, po));
772
773 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */
774 pmclog_stop_kthread(po);
775
776 KASSERT(po->po_kthread == NULL,
777 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po));
778
779 /* return all queued log buffers to the global pool */
780 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) {
781 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
782 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
783 pmc_plb_rele(lb);
784 }
785 pmc_save_cpu_binding(&pb);
786 for (int i = 0; i < mp_ncpus; i++) {
787 pmc_select_cpu(i);
788 /* return the 'current' buffer to the global pool */
789 if ((lb = po->po_curbuf[curcpu]) != NULL) {
790 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
791 pmc_plb_rele(lb);
792 }
793 }
794 pmc_restore_cpu_binding(&pb);
795
796 /* drop a reference to the fd */
797 if (po->po_file != NULL) {
798 error = fdrop(po->po_file, curthread);
799 po->po_file = NULL;
800 } else
801 error = 0;
802 po->po_error = 0;
803
804 return (error);
805 }
806
807 /*
808 * Flush a process' log buffer.
809 */
810
811 int
pmclog_flush(struct pmc_owner * po,int force)812 pmclog_flush(struct pmc_owner *po, int force)
813 {
814 int error;
815
816 PMCDBG1(LOG,FLS,1, "po=%p", po);
817
818 /*
819 * If there is a pending error recorded by the logger thread,
820 * return that.
821 */
822 if (po->po_error)
823 return (po->po_error);
824
825 error = 0;
826
827 /*
828 * Check that we do have an active log file.
829 */
830 mtx_lock(&pmc_kthread_mtx);
831 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) {
832 error = EINVAL;
833 goto error;
834 }
835
836 pmclog_schedule_all(po);
837 error:
838 mtx_unlock(&pmc_kthread_mtx);
839
840 return (error);
841 }
842
843 static void
pmclog_schedule_one_cond(struct pmc_owner * po)844 pmclog_schedule_one_cond(struct pmc_owner *po)
845 {
846 struct pmclog_buffer *plb;
847 int cpu;
848
849 spinlock_enter();
850 cpu = curcpu;
851 /* tell hardclock not to run again */
852 if (PMC_CPU_HAS_SAMPLES(cpu))
853 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL);
854
855 plb = po->po_curbuf[cpu];
856 if (plb && plb->plb_ptr != plb->plb_base)
857 pmclog_schedule_io(po, 1);
858 spinlock_exit();
859 }
860
861 static void
pmclog_schedule_all(struct pmc_owner * po)862 pmclog_schedule_all(struct pmc_owner *po)
863 {
864 struct pmc_binding pb;
865
866 /*
867 * Schedule the current buffer if any and not empty.
868 */
869 pmc_save_cpu_binding(&pb);
870 for (int i = 0; i < mp_ncpus; i++) {
871 pmc_select_cpu(i);
872 pmclog_schedule_one_cond(po);
873 }
874 pmc_restore_cpu_binding(&pb);
875 }
876
877 int
pmclog_close(struct pmc_owner * po)878 pmclog_close(struct pmc_owner *po)
879 {
880
881 PMCDBG1(LOG,CLO,1, "po=%p", po);
882
883 pmclog_process_closelog(po);
884
885 mtx_lock(&pmc_kthread_mtx);
886 /*
887 * Initiate shutdown: no new data queued,
888 * thread will close file on last block.
889 */
890 po->po_flags |= PMC_PO_SHUTDOWN;
891 /* give time for all to see */
892 DELAY(50);
893
894 /*
895 * Schedule the current buffer.
896 */
897 pmclog_schedule_all(po);
898 wakeup_one(po);
899
900 mtx_unlock(&pmc_kthread_mtx);
901
902 return (0);
903 }
904
905 void
pmclog_process_callchain(struct pmc * pm,struct pmc_sample * ps)906 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps)
907 {
908 int n, recordlen;
909 uint32_t flags;
910 struct pmc_owner *po;
911
912 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid,
913 ps->ps_nsamples);
914
915 recordlen = offsetof(struct pmclog_callchain, pl_pc) +
916 ps->ps_nsamples * sizeof(uintfptr_t);
917 po = pm->pm_owner;
918 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags);
919 PMCLOG_RESERVE_SAFE(po, PMCLOG_TYPE_CALLCHAIN, recordlen, ps->ps_tsc);
920 PMCLOG_EMIT32(ps->ps_pid);
921 PMCLOG_EMIT32(ps->ps_tid);
922 PMCLOG_EMIT32(pm->pm_id);
923 PMCLOG_EMIT32(flags);
924 for (n = 0; n < ps->ps_nsamples; n++)
925 PMCLOG_EMITADDR(ps->ps_pc[n]);
926 PMCLOG_DESPATCH_SAFE(po);
927 }
928
929 void
pmclog_process_closelog(struct pmc_owner * po)930 pmclog_process_closelog(struct pmc_owner *po)
931 {
932 PMCLOG_RESERVE(po, PMCLOG_TYPE_CLOSELOG,
933 sizeof(struct pmclog_closelog));
934 PMCLOG_DESPATCH_SYNC(po);
935 }
936
937 void
pmclog_process_dropnotify(struct pmc_owner * po)938 pmclog_process_dropnotify(struct pmc_owner *po)
939 {
940 PMCLOG_RESERVE(po, PMCLOG_TYPE_DROPNOTIFY,
941 sizeof(struct pmclog_dropnotify));
942 PMCLOG_DESPATCH(po);
943 }
944
945 void
pmclog_process_map_in(struct pmc_owner * po,pid_t pid,uintfptr_t start,const char * path)946 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start,
947 const char *path)
948 {
949 int pathlen, recordlen;
950
951 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__));
952
953 pathlen = strlen(path) + 1; /* #bytes for path name */
954 recordlen = offsetof(struct pmclog_map_in, pl_pathname) +
955 pathlen;
956
957 PMCLOG_RESERVE(po, PMCLOG_TYPE_MAP_IN, recordlen);
958 PMCLOG_EMIT32(pid);
959 PMCLOG_EMIT32(0);
960 PMCLOG_EMITADDR(start);
961 PMCLOG_EMITSTRING(path,pathlen);
962 PMCLOG_DESPATCH_SYNC(po);
963 }
964
965 void
pmclog_process_map_out(struct pmc_owner * po,pid_t pid,uintfptr_t start,uintfptr_t end)966 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start,
967 uintfptr_t end)
968 {
969 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__));
970
971 PMCLOG_RESERVE(po, PMCLOG_TYPE_MAP_OUT, sizeof(struct pmclog_map_out));
972 PMCLOG_EMIT32(pid);
973 PMCLOG_EMIT32(0);
974 PMCLOG_EMITADDR(start);
975 PMCLOG_EMITADDR(end);
976 PMCLOG_DESPATCH(po);
977 }
978
979 void
pmclog_process_pmcallocate(struct pmc * pm)980 pmclog_process_pmcallocate(struct pmc *pm)
981 {
982 struct pmc_owner *po;
983 struct pmc_soft *ps;
984
985 po = pm->pm_owner;
986
987 PMCDBG1(LOG,ALL,1, "pm=%p", pm);
988
989 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) {
990 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCALLOCATEDYN,
991 sizeof(struct pmclog_pmcallocatedyn));
992 PMCLOG_EMIT32(pm->pm_id);
993 PMCLOG_EMIT32(pm->pm_event);
994 PMCLOG_EMIT32(pm->pm_flags);
995 PMCLOG_EMIT32(0);
996 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount);
997 ps = pmc_soft_ev_acquire(pm->pm_event);
998 if (ps != NULL)
999 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX);
1000 else
1001 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX);
1002 pmc_soft_ev_release(ps);
1003 PMCLOG_DESPATCH_SYNC(po);
1004 } else {
1005 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCALLOCATE,
1006 sizeof(struct pmclog_pmcallocate));
1007 PMCLOG_EMIT32(pm->pm_id);
1008 PMCLOG_EMIT32(pm->pm_event);
1009 PMCLOG_EMIT32(pm->pm_flags);
1010 PMCLOG_EMIT32(0);
1011 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount);
1012 PMCLOG_DESPATCH_SYNC(po);
1013 }
1014 }
1015
1016 void
pmclog_process_pmcattach(struct pmc * pm,pid_t pid,char * path)1017 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path)
1018 {
1019 int pathlen, recordlen;
1020 struct pmc_owner *po;
1021
1022 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid);
1023
1024 po = pm->pm_owner;
1025
1026 pathlen = strlen(path) + 1; /* #bytes for the string */
1027 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen;
1028
1029 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCATTACH, recordlen);
1030 PMCLOG_EMIT32(pm->pm_id);
1031 PMCLOG_EMIT32(pid);
1032 PMCLOG_EMITSTRING(path, pathlen);
1033 PMCLOG_DESPATCH_SYNC(po);
1034 }
1035
1036 void
pmclog_process_pmcdetach(struct pmc * pm,pid_t pid)1037 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid)
1038 {
1039 struct pmc_owner *po;
1040
1041 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid);
1042
1043 po = pm->pm_owner;
1044
1045 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCDETACH,
1046 sizeof(struct pmclog_pmcdetach));
1047 PMCLOG_EMIT32(pm->pm_id);
1048 PMCLOG_EMIT32(pid);
1049 PMCLOG_DESPATCH_SYNC(po);
1050 }
1051
1052 void
pmclog_process_proccreate(struct pmc_owner * po,struct proc * p,int sync)1053 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync)
1054 {
1055 if (sync) {
1056 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROC_CREATE,
1057 sizeof(struct pmclog_proccreate));
1058 PMCLOG_EMIT32(p->p_pid);
1059 PMCLOG_EMIT32(p->p_flag);
1060 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1);
1061 PMCLOG_DESPATCH_SYNC(po);
1062 } else {
1063 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROC_CREATE,
1064 sizeof(struct pmclog_proccreate));
1065 PMCLOG_EMIT32(p->p_pid);
1066 PMCLOG_EMIT32(p->p_flag);
1067 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1);
1068 PMCLOG_DESPATCH(po);
1069 }
1070 }
1071
1072 /*
1073 * Log a context switch event to the log file.
1074 */
1075
1076 void
pmclog_process_proccsw(struct pmc * pm,struct pmc_process * pp,pmc_value_t v,struct thread * td)1077 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td)
1078 {
1079 struct pmc_owner *po;
1080
1081 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW,
1082 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__));
1083
1084 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
1085 v);
1086
1087 po = pm->pm_owner;
1088
1089 PMCLOG_RESERVE_SAFE(po, PMCLOG_TYPE_PROCCSW,
1090 sizeof(struct pmclog_proccsw), pmc_rdtsc());
1091 PMCLOG_EMIT64(v);
1092 PMCLOG_EMIT32(pm->pm_id);
1093 PMCLOG_EMIT32(pp->pp_proc->p_pid);
1094 PMCLOG_EMIT32(td->td_tid);
1095 PMCLOG_EMIT32(0);
1096 PMCLOG_DESPATCH_SCHED_LOCK(po);
1097 }
1098
1099 void
pmclog_process_procexec(struct pmc_owner * po,pmc_id_t pmid,pid_t pid,uintptr_t baseaddr,uintptr_t dynaddr,char * path)1100 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid,
1101 uintptr_t baseaddr, uintptr_t dynaddr, char *path)
1102 {
1103 int pathlen, recordlen;
1104
1105 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path);
1106
1107 pathlen = strlen(path) + 1; /* #bytes for the path */
1108 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen;
1109 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCEXEC, recordlen);
1110 PMCLOG_EMIT32(pid);
1111 PMCLOG_EMIT32(pmid);
1112 PMCLOG_EMITADDR(baseaddr);
1113 PMCLOG_EMITADDR(dynaddr);
1114 PMCLOG_EMITSTRING(path,pathlen);
1115 PMCLOG_DESPATCH_SYNC(po);
1116 }
1117
1118 /*
1119 * Log a process exit event (and accumulated pmc value) to the log file.
1120 */
1121
1122 void
pmclog_process_procexit(struct pmc * pm,struct pmc_process * pp)1123 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp)
1124 {
1125 int ri;
1126 struct pmc_owner *po;
1127
1128 ri = PMC_TO_ROWINDEX(pm);
1129 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
1130 pp->pp_pmcs[ri].pp_pmcval);
1131
1132 po = pm->pm_owner;
1133
1134 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCEXIT,
1135 sizeof(struct pmclog_procexit));
1136 PMCLOG_EMIT32(pm->pm_id);
1137 PMCLOG_EMIT32(pp->pp_proc->p_pid);
1138 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval);
1139 PMCLOG_DESPATCH(po);
1140 }
1141
1142 /*
1143 * Log a fork event.
1144 */
1145
1146 void
pmclog_process_procfork(struct pmc_owner * po,pid_t oldpid,pid_t newpid)1147 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid)
1148 {
1149 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCFORK,
1150 sizeof(struct pmclog_procfork));
1151 PMCLOG_EMIT32(oldpid);
1152 PMCLOG_EMIT32(newpid);
1153 PMCLOG_DESPATCH(po);
1154 }
1155
1156 /*
1157 * Log a process exit event of the form suitable for system-wide PMCs.
1158 */
1159
1160 void
pmclog_process_sysexit(struct pmc_owner * po,pid_t pid)1161 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid)
1162 {
1163 PMCLOG_RESERVE(po, PMCLOG_TYPE_SYSEXIT, sizeof(struct pmclog_sysexit));
1164 PMCLOG_EMIT32(pid);
1165 PMCLOG_DESPATCH(po);
1166 }
1167
1168 void
pmclog_process_threadcreate(struct pmc_owner * po,struct thread * td,int sync)1169 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync)
1170 {
1171 struct proc *p;
1172
1173 p = td->td_proc;
1174 if (sync) {
1175 PMCLOG_RESERVE(po, PMCLOG_TYPE_THR_CREATE,
1176 sizeof(struct pmclog_threadcreate));
1177 PMCLOG_EMIT32(td->td_tid);
1178 PMCLOG_EMIT32(p->p_pid);
1179 PMCLOG_EMIT32(p->p_flag);
1180 PMCLOG_EMIT32(0);
1181 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1);
1182 PMCLOG_DESPATCH_SYNC(po);
1183 } else {
1184 PMCLOG_RESERVE(po, PMCLOG_TYPE_THR_CREATE,
1185 sizeof(struct pmclog_threadcreate));
1186 PMCLOG_EMIT32(td->td_tid);
1187 PMCLOG_EMIT32(p->p_pid);
1188 PMCLOG_EMIT32(p->p_flag);
1189 PMCLOG_EMIT32(0);
1190 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1);
1191 PMCLOG_DESPATCH(po);
1192 }
1193 }
1194
1195 void
pmclog_process_threadexit(struct pmc_owner * po,struct thread * td)1196 pmclog_process_threadexit(struct pmc_owner *po, struct thread *td)
1197 {
1198
1199 PMCLOG_RESERVE(po, PMCLOG_TYPE_THR_EXIT,
1200 sizeof(struct pmclog_threadexit));
1201 PMCLOG_EMIT32(td->td_tid);
1202 PMCLOG_DESPATCH(po);
1203 }
1204
1205 /*
1206 * Write a user log entry.
1207 */
1208
1209 int
pmclog_process_userlog(struct pmc_owner * po,struct pmc_op_writelog * wl)1210 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl)
1211 {
1212 int error;
1213
1214 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata);
1215
1216 error = 0;
1217
1218 PMCLOG_RESERVE_WITH_ERROR(po, PMCLOG_TYPE_USERDATA,
1219 sizeof(struct pmclog_userdata));
1220 PMCLOG_EMIT32(wl->pm_userdata);
1221 PMCLOG_DESPATCH(po);
1222
1223 error:
1224 return (error);
1225 }
1226
1227 /*
1228 * Initialization.
1229 *
1230 * Create a pool of log buffers and initialize mutexes.
1231 */
1232
1233 void
pmclog_initialize(void)1234 pmclog_initialize(void)
1235 {
1236 struct pmclog_buffer *plb;
1237 int domain, ncpus, total;
1238
1239 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) {
1240 (void) printf("hwpmc: tunable logbuffersize=%d must be "
1241 "greater than zero and less than or equal to 16MB.\n",
1242 pmclog_buffer_size);
1243 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
1244 }
1245
1246 if (pmc_nlogbuffers_pcpu <= 0) {
1247 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater "
1248 "than zero.\n", pmc_nlogbuffers_pcpu);
1249 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
1250 }
1251 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) {
1252 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n",
1253 pmc_nlogbuffers_pcpu*pmclog_buffer_size);
1254 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
1255 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
1256 }
1257 for (domain = 0; domain < vm_ndomains; domain++) {
1258 ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus;
1259 total = ncpus * pmc_nlogbuffers_pcpu;
1260
1261 plb = malloc_domainset(sizeof(struct pmclog_buffer) * total,
1262 M_PMC, DOMAINSET_PREF(domain), M_WAITOK | M_ZERO);
1263 pmc_dom_hdrs[domain]->pdbh_plbs = plb;
1264 for (; total > 0; total--, plb++) {
1265 void *buf;
1266
1267 buf = malloc_domainset(1024 * pmclog_buffer_size, M_PMC,
1268 DOMAINSET_PREF(domain), M_WAITOK | M_ZERO);
1269 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain);
1270 pmc_plb_rele_unlocked(plb);
1271 }
1272 }
1273 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF);
1274 }
1275
1276 /*
1277 * Shutdown logging.
1278 *
1279 * Destroy mutexes and release memory back the to free pool.
1280 */
1281
1282 void
pmclog_shutdown(void)1283 pmclog_shutdown(void)
1284 {
1285 struct pmclog_buffer *plb;
1286 int domain;
1287
1288 mtx_destroy(&pmc_kthread_mtx);
1289
1290 for (domain = 0; domain < vm_ndomains; domain++) {
1291 while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) {
1292 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next);
1293 free(plb->plb_base, M_PMC);
1294 }
1295 free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC);
1296 }
1297 }
1298