1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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/cdefs.h>
40 __FBSDID("$FreeBSD$");
41
42 #include <sys/param.h>
43 #include <sys/capsicum.h>
44 #include <sys/domainset.h>
45 #include <sys/file.h>
46 #include <sys/kernel.h>
47 #include <sys/kthread.h>
48 #include <sys/lock.h>
49 #include <sys/module.h>
50 #include <sys/mutex.h>
51 #include <sys/pmc.h>
52 #include <sys/pmckern.h>
53 #include <sys/pmclog.h>
54 #include <sys/proc.h>
55 #include <sys/sched.h>
56 #include <sys/signalvar.h>
57 #include <sys/smp.h>
58 #include <sys/syscallsubr.h>
59 #include <sys/sysctl.h>
60 #include <sys/systm.h>
61 #include <sys/uio.h>
62 #include <sys/unistd.h>
63 #include <sys/vnode.h>
64
65 #if defined(__i386__) || defined(__amd64__)
66 #include <machine/clock.h>
67 #endif
68
69 #define curdomain PCPU_GET(domain)
70
71 /*
72 * Sysctl tunables
73 */
74
75 SYSCTL_DECL(_kern_hwpmc);
76
77 /*
78 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers.
79 */
80
81 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
82 #if (__FreeBSD_version < 1100000)
83 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size);
84 #endif
85 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN,
86 &pmclog_buffer_size, 0, "size of log buffers in kilobytes");
87
88 /*
89 * kern.hwpmc.nbuffer -- number of global log buffers
90 */
91
92 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
93 #if (__FreeBSD_version < 1100000)
94 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers_pcpu);
95 #endif
96 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN,
97 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu");
98
99 /*
100 * Global log buffer list and associated spin lock.
101 */
102
103 static struct mtx pmc_kthread_mtx; /* sleep lock */
104
105 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \
106 (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \
107 (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \
108 (D)->plb_domain = domain; \
109 } while (0)
110
111 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \
112 (D)->plb_ptr = (D)->plb_base; \
113 } while (0)
114
115 /*
116 * Log file record constructors.
117 */
118 #define _PMCLOG_TO_HEADER(T,L) \
119 ((PMCLOG_HEADER_MAGIC << 24) | \
120 (PMCLOG_TYPE_ ## T << 16) | \
121 ((L) & 0xFFFF))
122
123 /* reserve LEN bytes of space and initialize the entry header */
124 #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION, TSC) do { \
125 uint32_t *_le; \
126 int _len = roundup((LEN), sizeof(uint32_t)); \
127 struct pmclog_header *ph; \
128 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
129 ACTION; \
130 } \
131 ph = (struct pmclog_header *)_le; \
132 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \
133 ph->pl_tsc = (TSC); \
134 _le += sizeof(*ph)/4 /* skip over timestamp */
135
136 /* reserve LEN bytes of space and initialize the entry header */
137 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \
138 uint32_t *_le; \
139 int _len = roundup((LEN), sizeof(uint32_t)); \
140 uint64_t tsc; \
141 struct pmclog_header *ph; \
142 tsc = pmc_rdtsc(); \
143 spinlock_enter(); \
144 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
145 spinlock_exit(); \
146 ACTION; \
147 } \
148 ph = (struct pmclog_header *)_le; \
149 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \
150 ph->pl_tsc = tsc; \
151 _le += sizeof(*ph)/4 /* skip over timestamp */
152
153
154
155 #define PMCLOG_RESERVE_SAFE(P,T,L,TSC) _PMCLOG_RESERVE_SAFE(P,T,L,return,TSC)
156 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return)
157 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \
158 error=ENOMEM;goto error)
159
160 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0)
161 #define PMCLOG_EMIT64(V) do { \
162 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \
163 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \
164 } while (0)
165
166
167 /* Emit a string. Caution: does NOT update _le, so needs to be last */
168 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0)
169 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0)
170
171 #define PMCLOG_DESPATCH_SAFE(PO) \
172 pmclog_release((PO)); \
173 } while (0)
174
175 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \
176 pmclog_release_flags((PO), 0); \
177 } while (0)
178
179 #define PMCLOG_DESPATCH(PO) \
180 pmclog_release((PO)); \
181 spinlock_exit(); \
182 } while (0)
183
184 #define PMCLOG_DESPATCH_SYNC(PO) \
185 pmclog_schedule_io((PO), 1); \
186 spinlock_exit(); \
187 } while (0)
188
189
190 #define TSDELTA 4
191 /*
192 * Assertions about the log file format.
193 */
194 CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA +
195 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t));
196 CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA);
197 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA);
198 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA +
199 5*4 + sizeof(uintfptr_t));
200 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) ==
201 5*4 + TSDELTA + sizeof(uintfptr_t));
202 CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA);
203 CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA);
204 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA);
205 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA);
206 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA);
207 CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA);
208 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX +
209 sizeof(uintfptr_t) + TSDELTA);
210 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA +
211 sizeof(uintfptr_t));
212 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA);
213 CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA);
214 CTASSERT(sizeof(struct pmclog_sysexit) == 6*4);
215 CTASSERT(sizeof(struct pmclog_userdata) == 6*4);
216
217 /*
218 * Log buffer structure
219 */
220
221 struct pmclog_buffer {
222 TAILQ_ENTRY(pmclog_buffer) plb_next;
223 char *plb_base;
224 char *plb_ptr;
225 char *plb_fence;
226 uint16_t plb_domain;
227 } __aligned(CACHE_LINE_SIZE);
228
229 /*
230 * Prototypes
231 */
232
233 static int pmclog_get_buffer(struct pmc_owner *po);
234 static void pmclog_loop(void *arg);
235 static void pmclog_release(struct pmc_owner *po);
236 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length);
237 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup);
238 static void pmclog_schedule_all(struct pmc_owner *po);
239 static void pmclog_stop_kthread(struct pmc_owner *po);
240
241 /*
242 * Helper functions
243 */
244
245 static inline void
pmc_plb_rele_unlocked(struct pmclog_buffer * plb)246 pmc_plb_rele_unlocked(struct pmclog_buffer *plb)
247 {
248 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next);
249 }
250
251 static inline void
pmc_plb_rele(struct pmclog_buffer * plb)252 pmc_plb_rele(struct pmclog_buffer *plb)
253 {
254 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx);
255 pmc_plb_rele_unlocked(plb);
256 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx);
257 }
258
259 /*
260 * Get a log buffer
261 */
262 static int
pmclog_get_buffer(struct pmc_owner * po)263 pmclog_get_buffer(struct pmc_owner *po)
264 {
265 struct pmclog_buffer *plb;
266 int domain;
267
268 KASSERT(po->po_curbuf[curcpu] == NULL,
269 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po));
270
271 domain = curdomain;
272 MPASS(pmc_dom_hdrs[domain]);
273 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx);
274 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL)
275 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next);
276 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx);
277
278 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb);
279
280 #ifdef HWPMC_DEBUG
281 if (plb)
282 KASSERT(plb->plb_ptr == plb->plb_base &&
283 plb->plb_base < plb->plb_fence,
284 ("[pmclog,%d] po=%p buffer invariants: ptr=%p "
285 "base=%p fence=%p", __LINE__, po, plb->plb_ptr,
286 plb->plb_base, plb->plb_fence));
287 #endif
288
289 po->po_curbuf[curcpu] = plb;
290
291 /* update stats */
292 counter_u64_add(pmc_stats.pm_buffer_requests, 1);
293 if (plb == NULL)
294 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1);
295
296 return (plb ? 0 : ENOMEM);
297 }
298
299 struct pmclog_proc_init_args {
300 struct proc *kthr;
301 struct pmc_owner *po;
302 bool exit;
303 bool acted;
304 };
305
306 int
pmclog_proc_create(struct thread * td,void ** handlep)307 pmclog_proc_create(struct thread *td, void **handlep)
308 {
309 struct pmclog_proc_init_args *ia;
310 int error;
311
312 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO);
313 error = kproc_create(pmclog_loop, ia, &ia->kthr,
314 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid);
315 if (error == 0)
316 *handlep = ia;
317 return (error);
318 }
319
320 void
pmclog_proc_ignite(void * handle,struct pmc_owner * po)321 pmclog_proc_ignite(void *handle, struct pmc_owner *po)
322 {
323 struct pmclog_proc_init_args *ia;
324
325 ia = handle;
326 mtx_lock(&pmc_kthread_mtx);
327 MPASS(!ia->acted);
328 MPASS(ia->po == NULL);
329 MPASS(!ia->exit);
330 MPASS(ia->kthr != NULL);
331 if (po == NULL) {
332 ia->exit = true;
333 } else {
334 ia->po = po;
335 KASSERT(po->po_kthread == NULL,
336 ("[pmclog,%d] po=%p kthread (%p) already present",
337 __LINE__, po, po->po_kthread));
338 po->po_kthread = ia->kthr;
339 }
340 wakeup(ia);
341 while (!ia->acted)
342 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0);
343 mtx_unlock(&pmc_kthread_mtx);
344 free(ia, M_TEMP);
345 }
346
347 /*
348 * Log handler loop.
349 *
350 * This function is executed by each pmc owner's helper thread.
351 */
352 static void
pmclog_loop(void * arg)353 pmclog_loop(void *arg)
354 {
355 struct pmclog_proc_init_args *ia;
356 struct pmc_owner *po;
357 struct pmclog_buffer *lb;
358 struct proc *p;
359 struct ucred *ownercred;
360 struct ucred *mycred;
361 struct thread *td;
362 sigset_t unb;
363 struct uio auio;
364 struct iovec aiov;
365 size_t nbytes;
366 int error;
367
368 td = curthread;
369
370 SIGEMPTYSET(unb);
371 SIGADDSET(unb, SIGHUP);
372 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0);
373
374 ia = arg;
375 MPASS(ia->kthr == curproc);
376 MPASS(!ia->acted);
377 mtx_lock(&pmc_kthread_mtx);
378 while (ia->po == NULL && !ia->exit)
379 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0);
380 if (ia->exit) {
381 ia->acted = true;
382 wakeup(ia);
383 mtx_unlock(&pmc_kthread_mtx);
384 kproc_exit(0);
385 }
386 MPASS(ia->po != NULL);
387 po = ia->po;
388 ia->acted = true;
389 wakeup(ia);
390 mtx_unlock(&pmc_kthread_mtx);
391 ia = NULL;
392
393 p = po->po_owner;
394 mycred = td->td_ucred;
395
396 PROC_LOCK(p);
397 ownercred = crhold(p->p_ucred);
398 PROC_UNLOCK(p);
399
400 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread);
401 KASSERT(po->po_kthread == curthread->td_proc,
402 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__,
403 po, po->po_kthread, curthread->td_proc));
404
405 lb = NULL;
406
407
408 /*
409 * Loop waiting for I/O requests to be added to the owner
410 * struct's queue. The loop is exited when the log file
411 * is deconfigured.
412 */
413
414 mtx_lock(&pmc_kthread_mtx);
415
416 for (;;) {
417
418 /* check if we've been asked to exit */
419 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
420 break;
421
422 if (lb == NULL) { /* look for a fresh buffer to write */
423 mtx_lock_spin(&po->po_mtx);
424 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) {
425 mtx_unlock_spin(&po->po_mtx);
426
427 /* No more buffers and shutdown required. */
428 if (po->po_flags & PMC_PO_SHUTDOWN)
429 break;
430
431 (void) msleep(po, &pmc_kthread_mtx, PWAIT,
432 "pmcloop", 250);
433 continue;
434 }
435
436 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
437 mtx_unlock_spin(&po->po_mtx);
438 }
439
440 mtx_unlock(&pmc_kthread_mtx);
441
442 /* process the request */
443 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po,
444 lb->plb_base, lb->plb_ptr);
445 /* change our thread's credentials before issuing the I/O */
446
447 aiov.iov_base = lb->plb_base;
448 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base;
449
450 auio.uio_iov = &aiov;
451 auio.uio_iovcnt = 1;
452 auio.uio_offset = -1;
453 auio.uio_resid = nbytes;
454 auio.uio_rw = UIO_WRITE;
455 auio.uio_segflg = UIO_SYSSPACE;
456 auio.uio_td = td;
457
458 /* switch thread credentials -- see kern_ktrace.c */
459 td->td_ucred = ownercred;
460 error = fo_write(po->po_file, &auio, ownercred, 0, td);
461 td->td_ucred = mycred;
462
463 if (error) {
464 /* XXX some errors are recoverable */
465 /* send a SIGIO to the owner and exit */
466 PROC_LOCK(p);
467 kern_psignal(p, SIGIO);
468 PROC_UNLOCK(p);
469
470 mtx_lock(&pmc_kthread_mtx);
471
472 po->po_error = error; /* save for flush log */
473
474 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error);
475
476 break;
477 }
478
479 mtx_lock(&pmc_kthread_mtx);
480
481 /* put the used buffer back into the global pool */
482 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
483
484 pmc_plb_rele(lb);
485 lb = NULL;
486 }
487
488 wakeup_one(po->po_kthread);
489 po->po_kthread = NULL;
490
491 mtx_unlock(&pmc_kthread_mtx);
492
493 /* return the current I/O buffer to the global pool */
494 if (lb) {
495 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
496
497 pmc_plb_rele(lb);
498 }
499
500 /*
501 * Exit this thread, signalling the waiter
502 */
503
504 crfree(ownercred);
505
506 kproc_exit(0);
507 }
508
509 /*
510 * Release and log entry and schedule an I/O if needed.
511 */
512
513 static void
pmclog_release_flags(struct pmc_owner * po,int wakeup)514 pmclog_release_flags(struct pmc_owner *po, int wakeup)
515 {
516 struct pmclog_buffer *plb;
517
518 plb = po->po_curbuf[curcpu];
519 KASSERT(plb->plb_ptr >= plb->plb_base,
520 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
521 po, plb->plb_ptr, plb->plb_base));
522 KASSERT(plb->plb_ptr <= plb->plb_fence,
523 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
524 po, plb->plb_ptr, plb->plb_fence));
525
526 /* schedule an I/O if we've filled a buffer */
527 if (plb->plb_ptr >= plb->plb_fence)
528 pmclog_schedule_io(po, wakeup);
529
530 PMCDBG1(LOG,REL,1, "po=%p", po);
531 }
532
533 static void
pmclog_release(struct pmc_owner * po)534 pmclog_release(struct pmc_owner *po)
535 {
536
537 pmclog_release_flags(po, 1);
538 }
539
540
541 /*
542 * Attempt to reserve 'length' bytes of space in an owner's log
543 * buffer. The function returns a pointer to 'length' bytes of space
544 * if there was enough space or returns NULL if no space was
545 * available. Non-null returns do so with the po mutex locked. The
546 * caller must invoke pmclog_release() on the pmc owner structure
547 * when done.
548 */
549
550 static uint32_t *
pmclog_reserve(struct pmc_owner * po,int length)551 pmclog_reserve(struct pmc_owner *po, int length)
552 {
553 uintptr_t newptr, oldptr;
554 struct pmclog_buffer *plb, **pplb;
555
556 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length);
557
558 KASSERT(length % sizeof(uint32_t) == 0,
559 ("[pmclog,%d] length not a multiple of word size", __LINE__));
560
561 /* No more data when shutdown in progress. */
562 if (po->po_flags & PMC_PO_SHUTDOWN)
563 return (NULL);
564
565 pplb = &po->po_curbuf[curcpu];
566 if (*pplb == NULL && pmclog_get_buffer(po) != 0)
567 goto fail;
568
569 KASSERT(*pplb != NULL,
570 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
571
572 plb = *pplb;
573 KASSERT(plb->plb_ptr >= plb->plb_base &&
574 plb->plb_ptr <= plb->plb_fence,
575 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
576 __LINE__, po, plb->plb_ptr, plb->plb_base,
577 plb->plb_fence));
578
579 oldptr = (uintptr_t) plb->plb_ptr;
580 newptr = oldptr + length;
581
582 KASSERT(oldptr != (uintptr_t) NULL,
583 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po));
584
585 /*
586 * If we have space in the current buffer, return a pointer to
587 * available space with the PO structure locked.
588 */
589 if (newptr <= (uintptr_t) plb->plb_fence) {
590 plb->plb_ptr = (char *) newptr;
591 goto done;
592 }
593
594 /*
595 * Otherwise, schedule the current buffer for output and get a
596 * fresh buffer.
597 */
598 pmclog_schedule_io(po, 0);
599
600 if (pmclog_get_buffer(po) != 0)
601 goto fail;
602
603 plb = *pplb;
604 KASSERT(plb != NULL,
605 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
606
607 KASSERT(plb->plb_ptr != NULL,
608 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__));
609
610 KASSERT(plb->plb_ptr == plb->plb_base &&
611 plb->plb_ptr <= plb->plb_fence,
612 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
613 __LINE__, po, plb->plb_ptr, plb->plb_base,
614 plb->plb_fence));
615
616 oldptr = (uintptr_t) plb->plb_ptr;
617
618 done:
619 return ((uint32_t *) oldptr);
620 fail:
621 return (NULL);
622 }
623
624 /*
625 * Schedule an I/O.
626 *
627 * Transfer the current buffer to the helper kthread.
628 */
629
630 static void
pmclog_schedule_io(struct pmc_owner * po,int wakeup)631 pmclog_schedule_io(struct pmc_owner *po, int wakeup)
632 {
633 struct pmclog_buffer *plb;
634
635 plb = po->po_curbuf[curcpu];
636 po->po_curbuf[curcpu] = NULL;
637 KASSERT(plb != NULL,
638 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po));
639 KASSERT(plb->plb_ptr >= plb->plb_base,
640 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
641 po, plb->plb_ptr, plb->plb_base));
642 KASSERT(plb->plb_ptr <= plb->plb_fence,
643 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
644 po, plb->plb_ptr, plb->plb_fence));
645
646 PMCDBG1(LOG,SIO, 1, "po=%p", po);
647
648 /*
649 * Add the current buffer to the tail of the buffer list and
650 * wakeup the helper.
651 */
652 mtx_lock_spin(&po->po_mtx);
653 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next);
654 mtx_unlock_spin(&po->po_mtx);
655 if (wakeup)
656 wakeup_one(po);
657 }
658
659 /*
660 * Stop the helper kthread.
661 */
662
663 static void
pmclog_stop_kthread(struct pmc_owner * po)664 pmclog_stop_kthread(struct pmc_owner *po)
665 {
666
667 mtx_lock(&pmc_kthread_mtx);
668 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
669 if (po->po_kthread != NULL) {
670 PROC_LOCK(po->po_kthread);
671 kern_psignal(po->po_kthread, SIGHUP);
672 PROC_UNLOCK(po->po_kthread);
673 }
674 wakeup_one(po);
675 while (po->po_kthread)
676 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0);
677 mtx_unlock(&pmc_kthread_mtx);
678 }
679
680 /*
681 * Public functions
682 */
683
684 /*
685 * Configure a log file for pmc owner 'po'.
686 *
687 * Parameter 'logfd' is a file handle referencing an open file in the
688 * owner process. This file needs to have been opened for writing.
689 */
690
691 int
pmclog_configure_log(struct pmc_mdep * md,struct pmc_owner * po,int logfd)692 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd)
693 {
694 struct proc *p;
695 struct timespec ts;
696 uint64_t tsc;
697 int error;
698
699 sx_assert(&pmc_sx, SA_XLOCKED);
700 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd);
701
702 p = po->po_owner;
703
704 /* return EBUSY if a log file was already present */
705 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
706 return (EBUSY);
707
708 KASSERT(po->po_file == NULL,
709 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po,
710 po->po_file));
711
712 /* get a reference to the file state */
713 error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file);
714 if (error)
715 goto error;
716
717 /* mark process as owning a log file */
718 po->po_flags |= PMC_PO_OWNS_LOGFILE;
719
720 /* mark process as using HWPMCs */
721 PROC_LOCK(p);
722 p->p_flag |= P_HWPMC;
723 PROC_UNLOCK(p);
724 nanotime(&ts);
725 tsc = pmc_rdtsc();
726 /* create a log initialization entry */
727 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE,
728 sizeof(struct pmclog_initialize));
729 PMCLOG_EMIT32(PMC_VERSION);
730 PMCLOG_EMIT32(md->pmd_cputype);
731 #if defined(__i386__) || defined(__amd64__)
732 PMCLOG_EMIT64(tsc_freq);
733 #else
734 /* other architectures will need to fill this in */
735 PMCLOG_EMIT32(0);
736 PMCLOG_EMIT32(0);
737 #endif
738 memcpy(_le, &ts, sizeof(ts));
739 _le += sizeof(ts)/4;
740 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN);
741 PMCLOG_DESPATCH_SYNC(po);
742
743 return (0);
744
745 error:
746 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not "
747 "stopped", __LINE__, po));
748
749 if (po->po_file)
750 (void) fdrop(po->po_file, curthread);
751 po->po_file = NULL; /* clear file and error state */
752 po->po_error = 0;
753 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
754
755 return (error);
756 }
757
758
759 /*
760 * De-configure a log file. This will throw away any buffers queued
761 * for this owner process.
762 */
763
764 int
pmclog_deconfigure_log(struct pmc_owner * po)765 pmclog_deconfigure_log(struct pmc_owner *po)
766 {
767 int error;
768 struct pmclog_buffer *lb;
769
770 PMCDBG1(LOG,CFG,1, "de-config po=%p", po);
771
772 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
773 return (EINVAL);
774
775 KASSERT(po->po_sscount == 0,
776 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po));
777 KASSERT(po->po_file != NULL,
778 ("[pmclog,%d] po=%p no log file", __LINE__, po));
779
780 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */
781 pmclog_stop_kthread(po);
782
783 KASSERT(po->po_kthread == NULL,
784 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po));
785
786 /* return all queued log buffers to the global pool */
787 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) {
788 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
789 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
790 pmc_plb_rele(lb);
791 }
792 for (int i = 0; i < mp_ncpus; i++) {
793 thread_lock(curthread);
794 sched_bind(curthread, i);
795 thread_unlock(curthread);
796 /* return the 'current' buffer to the global pool */
797 if ((lb = po->po_curbuf[curcpu]) != NULL) {
798 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
799 pmc_plb_rele(lb);
800 }
801 }
802 thread_lock(curthread);
803 sched_unbind(curthread);
804 thread_unlock(curthread);
805
806 /* drop a reference to the fd */
807 if (po->po_file != NULL) {
808 error = fdrop(po->po_file, curthread);
809 po->po_file = NULL;
810 } else
811 error = 0;
812 po->po_error = 0;
813
814 return (error);
815 }
816
817 /*
818 * Flush a process' log buffer.
819 */
820
821 int
pmclog_flush(struct pmc_owner * po,int force)822 pmclog_flush(struct pmc_owner *po, int force)
823 {
824 int error;
825
826 PMCDBG1(LOG,FLS,1, "po=%p", po);
827
828 /*
829 * If there is a pending error recorded by the logger thread,
830 * return that.
831 */
832 if (po->po_error)
833 return (po->po_error);
834
835 error = 0;
836
837 /*
838 * Check that we do have an active log file.
839 */
840 mtx_lock(&pmc_kthread_mtx);
841 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) {
842 error = EINVAL;
843 goto error;
844 }
845
846 pmclog_schedule_all(po);
847 error:
848 mtx_unlock(&pmc_kthread_mtx);
849
850 return (error);
851 }
852
853 static void
pmclog_schedule_one_cond(struct pmc_owner * po)854 pmclog_schedule_one_cond(struct pmc_owner *po)
855 {
856 struct pmclog_buffer *plb;
857 int cpu;
858
859 spinlock_enter();
860 cpu = curcpu;
861 /* tell hardclock not to run again */
862 if (PMC_CPU_HAS_SAMPLES(cpu))
863 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL);
864
865 plb = po->po_curbuf[cpu];
866 if (plb && plb->plb_ptr != plb->plb_base)
867 pmclog_schedule_io(po, 1);
868 spinlock_exit();
869 }
870
871 static void
pmclog_schedule_all(struct pmc_owner * po)872 pmclog_schedule_all(struct pmc_owner *po)
873 {
874 /*
875 * Schedule the current buffer if any and not empty.
876 */
877 for (int i = 0; i < mp_ncpus; i++) {
878 thread_lock(curthread);
879 sched_bind(curthread, i);
880 thread_unlock(curthread);
881 pmclog_schedule_one_cond(po);
882 }
883 thread_lock(curthread);
884 sched_unbind(curthread);
885 thread_unlock(curthread);
886 }
887
888 int
pmclog_close(struct pmc_owner * po)889 pmclog_close(struct pmc_owner *po)
890 {
891
892 PMCDBG1(LOG,CLO,1, "po=%p", po);
893
894 pmclog_process_closelog(po);
895
896 mtx_lock(&pmc_kthread_mtx);
897 /*
898 * Initiate shutdown: no new data queued,
899 * thread will close file on last block.
900 */
901 po->po_flags |= PMC_PO_SHUTDOWN;
902 /* give time for all to see */
903 DELAY(50);
904
905 /*
906 * Schedule the current buffer.
907 */
908 pmclog_schedule_all(po);
909 wakeup_one(po);
910
911 mtx_unlock(&pmc_kthread_mtx);
912
913 return (0);
914 }
915
916 void
pmclog_process_callchain(struct pmc * pm,struct pmc_sample * ps)917 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps)
918 {
919 int n, recordlen;
920 uint32_t flags;
921 struct pmc_owner *po;
922
923 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid,
924 ps->ps_nsamples);
925
926 recordlen = offsetof(struct pmclog_callchain, pl_pc) +
927 ps->ps_nsamples * sizeof(uintfptr_t);
928 po = pm->pm_owner;
929 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags);
930 PMCLOG_RESERVE_SAFE(po, CALLCHAIN, recordlen, ps->ps_tsc);
931 PMCLOG_EMIT32(ps->ps_pid);
932 PMCLOG_EMIT32(ps->ps_tid);
933 PMCLOG_EMIT32(pm->pm_id);
934 PMCLOG_EMIT32(flags);
935 for (n = 0; n < ps->ps_nsamples; n++)
936 PMCLOG_EMITADDR(ps->ps_pc[n]);
937 PMCLOG_DESPATCH_SAFE(po);
938 }
939
940 void
pmclog_process_closelog(struct pmc_owner * po)941 pmclog_process_closelog(struct pmc_owner *po)
942 {
943 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog));
944 PMCLOG_DESPATCH_SYNC(po);
945 }
946
947 void
pmclog_process_dropnotify(struct pmc_owner * po)948 pmclog_process_dropnotify(struct pmc_owner *po)
949 {
950 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify));
951 PMCLOG_DESPATCH(po);
952 }
953
954 void
pmclog_process_map_in(struct pmc_owner * po,pid_t pid,uintfptr_t start,const char * path)955 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start,
956 const char *path)
957 {
958 int pathlen, recordlen;
959
960 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__));
961
962 pathlen = strlen(path) + 1; /* #bytes for path name */
963 recordlen = offsetof(struct pmclog_map_in, pl_pathname) +
964 pathlen;
965
966 PMCLOG_RESERVE(po, MAP_IN, recordlen);
967 PMCLOG_EMIT32(pid);
968 PMCLOG_EMIT32(0);
969 PMCLOG_EMITADDR(start);
970 PMCLOG_EMITSTRING(path,pathlen);
971 PMCLOG_DESPATCH_SYNC(po);
972 }
973
974 void
pmclog_process_map_out(struct pmc_owner * po,pid_t pid,uintfptr_t start,uintfptr_t end)975 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start,
976 uintfptr_t end)
977 {
978 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__));
979
980 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out));
981 PMCLOG_EMIT32(pid);
982 PMCLOG_EMIT32(0);
983 PMCLOG_EMITADDR(start);
984 PMCLOG_EMITADDR(end);
985 PMCLOG_DESPATCH(po);
986 }
987
988 void
pmclog_process_pmcallocate(struct pmc * pm)989 pmclog_process_pmcallocate(struct pmc *pm)
990 {
991 struct pmc_owner *po;
992 struct pmc_soft *ps;
993
994 po = pm->pm_owner;
995
996 PMCDBG1(LOG,ALL,1, "pm=%p", pm);
997
998 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) {
999 PMCLOG_RESERVE(po, PMCALLOCATEDYN,
1000 sizeof(struct pmclog_pmcallocatedyn));
1001 PMCLOG_EMIT32(pm->pm_id);
1002 PMCLOG_EMIT32(pm->pm_event);
1003 PMCLOG_EMIT32(pm->pm_flags);
1004 PMCLOG_EMIT32(0);
1005 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount);
1006 ps = pmc_soft_ev_acquire(pm->pm_event);
1007 if (ps != NULL)
1008 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX);
1009 else
1010 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX);
1011 pmc_soft_ev_release(ps);
1012 PMCLOG_DESPATCH_SYNC(po);
1013 } else {
1014 PMCLOG_RESERVE(po, PMCALLOCATE,
1015 sizeof(struct pmclog_pmcallocate));
1016 PMCLOG_EMIT32(pm->pm_id);
1017 PMCLOG_EMIT32(pm->pm_event);
1018 PMCLOG_EMIT32(pm->pm_flags);
1019 PMCLOG_EMIT32(0);
1020 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount);
1021 PMCLOG_DESPATCH_SYNC(po);
1022 }
1023 }
1024
1025 void
pmclog_process_pmcattach(struct pmc * pm,pid_t pid,char * path)1026 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path)
1027 {
1028 int pathlen, recordlen;
1029 struct pmc_owner *po;
1030
1031 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid);
1032
1033 po = pm->pm_owner;
1034
1035 pathlen = strlen(path) + 1; /* #bytes for the string */
1036 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen;
1037
1038 PMCLOG_RESERVE(po, PMCATTACH, recordlen);
1039 PMCLOG_EMIT32(pm->pm_id);
1040 PMCLOG_EMIT32(pid);
1041 PMCLOG_EMITSTRING(path, pathlen);
1042 PMCLOG_DESPATCH_SYNC(po);
1043 }
1044
1045 void
pmclog_process_pmcdetach(struct pmc * pm,pid_t pid)1046 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid)
1047 {
1048 struct pmc_owner *po;
1049
1050 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid);
1051
1052 po = pm->pm_owner;
1053
1054 PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach));
1055 PMCLOG_EMIT32(pm->pm_id);
1056 PMCLOG_EMIT32(pid);
1057 PMCLOG_DESPATCH_SYNC(po);
1058 }
1059
1060 void
pmclog_process_proccreate(struct pmc_owner * po,struct proc * p,int sync)1061 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync)
1062 {
1063 if (sync) {
1064 PMCLOG_RESERVE(po, PROC_CREATE, 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_SYNC(po);
1069 } else {
1070 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate));
1071 PMCLOG_EMIT32(p->p_pid);
1072 PMCLOG_EMIT32(p->p_flag);
1073 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1);
1074 PMCLOG_DESPATCH(po);
1075 }
1076 }
1077
1078 /*
1079 * Log a context switch event to the log file.
1080 */
1081
1082 void
pmclog_process_proccsw(struct pmc * pm,struct pmc_process * pp,pmc_value_t v,struct thread * td)1083 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td)
1084 {
1085 struct pmc_owner *po;
1086
1087 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW,
1088 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__));
1089
1090 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
1091 v);
1092
1093 po = pm->pm_owner;
1094
1095 PMCLOG_RESERVE_SAFE(po, PROCCSW, sizeof(struct pmclog_proccsw), pmc_rdtsc());
1096 PMCLOG_EMIT64(v);
1097 PMCLOG_EMIT32(pm->pm_id);
1098 PMCLOG_EMIT32(pp->pp_proc->p_pid);
1099 PMCLOG_EMIT32(td->td_tid);
1100 PMCLOG_EMIT32(0);
1101 PMCLOG_DESPATCH_SCHED_LOCK(po);
1102 }
1103
1104 void
pmclog_process_procexec(struct pmc_owner * po,pmc_id_t pmid,pid_t pid,uintfptr_t startaddr,char * path)1105 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid,
1106 uintfptr_t startaddr, char *path)
1107 {
1108 int pathlen, recordlen;
1109
1110 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path);
1111
1112 pathlen = strlen(path) + 1; /* #bytes for the path */
1113 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen;
1114 PMCLOG_RESERVE(po, PROCEXEC, recordlen);
1115 PMCLOG_EMIT32(pid);
1116 PMCLOG_EMIT32(pmid);
1117 PMCLOG_EMITADDR(startaddr);
1118 PMCLOG_EMITSTRING(path,pathlen);
1119 PMCLOG_DESPATCH_SYNC(po);
1120 }
1121
1122 /*
1123 * Log a process exit event (and accumulated pmc value) to the log file.
1124 */
1125
1126 void
pmclog_process_procexit(struct pmc * pm,struct pmc_process * pp)1127 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp)
1128 {
1129 int ri;
1130 struct pmc_owner *po;
1131
1132 ri = PMC_TO_ROWINDEX(pm);
1133 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
1134 pp->pp_pmcs[ri].pp_pmcval);
1135
1136 po = pm->pm_owner;
1137
1138 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit));
1139 PMCLOG_EMIT32(pm->pm_id);
1140 PMCLOG_EMIT32(pp->pp_proc->p_pid);
1141 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval);
1142 PMCLOG_DESPATCH(po);
1143 }
1144
1145 /*
1146 * Log a fork event.
1147 */
1148
1149 void
pmclog_process_procfork(struct pmc_owner * po,pid_t oldpid,pid_t newpid)1150 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid)
1151 {
1152 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork));
1153 PMCLOG_EMIT32(oldpid);
1154 PMCLOG_EMIT32(newpid);
1155 PMCLOG_DESPATCH(po);
1156 }
1157
1158 /*
1159 * Log a process exit event of the form suitable for system-wide PMCs.
1160 */
1161
1162 void
pmclog_process_sysexit(struct pmc_owner * po,pid_t pid)1163 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid)
1164 {
1165 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit));
1166 PMCLOG_EMIT32(pid);
1167 PMCLOG_DESPATCH(po);
1168 }
1169
1170 void
pmclog_process_threadcreate(struct pmc_owner * po,struct thread * td,int sync)1171 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync)
1172 {
1173 struct proc *p;
1174
1175 p = td->td_proc;
1176 if (sync) {
1177 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate));
1178 PMCLOG_EMIT32(td->td_tid);
1179 PMCLOG_EMIT32(p->p_pid);
1180 PMCLOG_EMIT32(p->p_flag);
1181 PMCLOG_EMIT32(0);
1182 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1);
1183 PMCLOG_DESPATCH_SYNC(po);
1184 } else {
1185 PMCLOG_RESERVE(po, THR_CREATE, 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, THR_EXIT, sizeof(struct pmclog_threadexit));
1200 PMCLOG_EMIT32(td->td_tid);
1201 PMCLOG_DESPATCH(po);
1202 }
1203
1204 /*
1205 * Write a user log entry.
1206 */
1207
1208 int
pmclog_process_userlog(struct pmc_owner * po,struct pmc_op_writelog * wl)1209 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl)
1210 {
1211 int error;
1212
1213 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata);
1214
1215 error = 0;
1216
1217 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA,
1218 sizeof(struct pmclog_userdata));
1219 PMCLOG_EMIT32(wl->pm_userdata);
1220 PMCLOG_DESPATCH(po);
1221
1222 error:
1223 return (error);
1224 }
1225
1226 /*
1227 * Initialization.
1228 *
1229 * Create a pool of log buffers and initialize mutexes.
1230 */
1231
1232 void
pmclog_initialize()1233 pmclog_initialize()
1234 {
1235 struct pmclog_buffer *plb;
1236 int domain, ncpus, total;
1237
1238 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) {
1239 (void) printf("hwpmc: tunable logbuffersize=%d must be "
1240 "greater than zero and less than or equal to 16MB.\n",
1241 pmclog_buffer_size);
1242 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
1243 }
1244
1245 if (pmc_nlogbuffers_pcpu <= 0) {
1246 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater "
1247 "than zero.\n", pmc_nlogbuffers_pcpu);
1248 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
1249 }
1250 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) {
1251 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n",
1252 pmc_nlogbuffers_pcpu*pmclog_buffer_size);
1253 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
1254 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
1255 }
1256 for (domain = 0; domain < vm_ndomains; domain++) {
1257 ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus;
1258 total = ncpus * pmc_nlogbuffers_pcpu;
1259
1260 plb = malloc_domainset(sizeof(struct pmclog_buffer) * total,
1261 M_PMC, DOMAINSET_PREF(domain), M_WAITOK | M_ZERO);
1262 pmc_dom_hdrs[domain]->pdbh_plbs = plb;
1263 for (; total > 0; total--, plb++) {
1264 void *buf;
1265
1266 buf = malloc_domainset(1024 * pmclog_buffer_size, M_PMC,
1267 DOMAINSET_PREF(domain), M_WAITOK | M_ZERO);
1268 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain);
1269 pmc_plb_rele_unlocked(plb);
1270 }
1271 }
1272 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF);
1273 }
1274
1275 /*
1276 * Shutdown logging.
1277 *
1278 * Destroy mutexes and release memory back the to free pool.
1279 */
1280
1281 void
pmclog_shutdown()1282 pmclog_shutdown()
1283 {
1284 struct pmclog_buffer *plb;
1285 int domain;
1286
1287 mtx_destroy(&pmc_kthread_mtx);
1288
1289 for (domain = 0; domain < vm_ndomains; domain++) {
1290 while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) {
1291 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next);
1292 free(plb->plb_base, M_PMC);
1293 }
1294 free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC);
1295 }
1296 }
1297