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