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