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/file.h> 45 #include <sys/kernel.h> 46 #include <sys/kthread.h> 47 #include <sys/lock.h> 48 #include <sys/module.h> 49 #include <sys/mutex.h> 50 #include <sys/pmc.h> 51 #include <sys/pmckern.h> 52 #include <sys/pmclog.h> 53 #include <sys/proc.h> 54 #include <sys/sched.h> 55 #include <sys/signalvar.h> 56 #include <sys/smp.h> 57 #include <sys/syscallsubr.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 #include <sys/uio.h> 61 #include <sys/unistd.h> 62 #include <sys/vnode.h> 63 64 #ifdef NUMA 65 #define NDOMAINS vm_ndomains 66 #define curdomain PCPU_GET(domain) 67 #else 68 #define NDOMAINS 1 69 #define curdomain 0 70 #define malloc_domain(size, type, domain, flags) malloc((size), (type), (flags)) 71 #define free_domain(addr, type) free(addr, type) 72 #endif 73 74 /* 75 * Sysctl tunables 76 */ 77 78 SYSCTL_DECL(_kern_hwpmc); 79 80 /* 81 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers. 82 */ 83 84 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 85 #if (__FreeBSD_version < 1100000) 86 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size); 87 #endif 88 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN, 89 &pmclog_buffer_size, 0, "size of log buffers in kilobytes"); 90 91 /* 92 * kern.hwpmc.nbuffer -- number of global log buffers 93 */ 94 95 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 96 #if (__FreeBSD_version < 1100000) 97 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers_pcpu); 98 #endif 99 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN, 100 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu"); 101 102 /* 103 * Global log buffer list and associated spin lock. 104 */ 105 106 static struct mtx pmc_kthread_mtx; /* sleep lock */ 107 108 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \ 109 (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \ 110 (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \ 111 (D)->plb_domain = domain; \ 112 } while (0) 113 114 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \ 115 (D)->plb_ptr = (D)->plb_base; \ 116 } while (0) 117 118 /* 119 * Log file record constructors. 120 */ 121 #define _PMCLOG_TO_HEADER(T,L) \ 122 ((PMCLOG_HEADER_MAGIC << 24) | \ 123 (PMCLOG_TYPE_ ## T << 16) | \ 124 ((L) & 0xFFFF)) 125 126 /* reserve LEN bytes of space and initialize the entry header */ 127 #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION) do { \ 128 uint32_t *_le; \ 129 int _len = roundup((LEN), sizeof(uint32_t)); \ 130 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 131 ACTION; \ 132 } \ 133 *_le = _PMCLOG_TO_HEADER(TYPE,_len); \ 134 _le += 3 /* 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 spinlock_enter(); \ 141 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 142 spinlock_exit(); \ 143 ACTION; \ 144 } \ 145 *_le = _PMCLOG_TO_HEADER(TYPE,_len); \ 146 _le += 3 /* skip over timestamp */ 147 148 149 #define PMCLOG_RESERVE_SAFE(P,T,L) _PMCLOG_RESERVE_SAFE(P,T,L,return) 150 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return) 151 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \ 152 error=ENOMEM;goto error) 153 154 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0) 155 #define PMCLOG_EMIT64(V) do { \ 156 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \ 157 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \ 158 } while (0) 159 160 161 /* Emit a string. Caution: does NOT update _le, so needs to be last */ 162 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) 163 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) 164 165 #define PMCLOG_DESPATCH_SAFE(PO) \ 166 pmclog_release((PO)); \ 167 } while (0) 168 169 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \ 170 pmclog_release_flags((PO), 0); \ 171 } while (0) 172 173 #define PMCLOG_DESPATCH(PO) \ 174 pmclog_release((PO)); \ 175 spinlock_exit(); \ 176 } while (0) 177 178 #define PMCLOG_DESPATCH_SYNC(PO) \ 179 pmclog_schedule_io((PO), 1); \ 180 spinlock_exit(); \ 181 } while (0) 182 183 184 /* 185 * Assertions about the log file format. 186 */ 187 188 CTASSERT(sizeof(struct pmclog_callchain) == 8*4 + 189 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t)); 190 CTASSERT(sizeof(struct pmclog_closelog) == 4*4); 191 CTASSERT(sizeof(struct pmclog_dropnotify) == 4*4); 192 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + 193 4*4 + sizeof(uintfptr_t)); 194 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) == 195 4*4 + sizeof(uintfptr_t)); 196 CTASSERT(sizeof(struct pmclog_map_out) == 4*4 + 2*sizeof(uintfptr_t)); 197 CTASSERT(sizeof(struct pmclog_pmcallocate) == 6*4); 198 CTASSERT(sizeof(struct pmclog_pmcattach) == 6*4 + PATH_MAX); 199 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 6*4); 200 CTASSERT(sizeof(struct pmclog_pmcdetach) == 6*4); 201 CTASSERT(sizeof(struct pmclog_proccsw) == 6*4 + 8); 202 CTASSERT(sizeof(struct pmclog_procexec) == 6*4 + PATH_MAX + 203 sizeof(uintfptr_t)); 204 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 6*4 + 205 sizeof(uintfptr_t)); 206 CTASSERT(sizeof(struct pmclog_procexit) == 6*4 + 8); 207 CTASSERT(sizeof(struct pmclog_procfork) == 6*4); 208 CTASSERT(sizeof(struct pmclog_sysexit) == 4*4); 209 CTASSERT(sizeof(struct pmclog_userdata) == 4*4); 210 211 /* 212 * Log buffer structure 213 */ 214 215 struct pmclog_buffer { 216 TAILQ_ENTRY(pmclog_buffer) plb_next; 217 char *plb_base; 218 char *plb_ptr; 219 char *plb_fence; 220 uint16_t plb_domain; 221 } __aligned(CACHE_LINE_SIZE); 222 223 /* 224 * Prototypes 225 */ 226 227 static int pmclog_get_buffer(struct pmc_owner *po); 228 static void pmclog_loop(void *arg); 229 static void pmclog_release(struct pmc_owner *po); 230 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length); 231 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup); 232 static void pmclog_schedule_all(struct pmc_owner *po, int force); 233 static void pmclog_stop_kthread(struct pmc_owner *po); 234 235 /* 236 * Helper functions 237 */ 238 239 static inline void 240 pmc_plb_rele_unlocked(struct pmclog_buffer *plb) 241 { 242 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next); 243 } 244 245 static inline void 246 pmc_plb_rele(struct pmclog_buffer *plb) 247 { 248 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 249 pmc_plb_rele_unlocked(plb); 250 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 251 } 252 253 /* 254 * Get a log buffer 255 */ 256 static int 257 pmclog_get_buffer(struct pmc_owner *po) 258 { 259 struct pmclog_buffer *plb; 260 int domain; 261 262 KASSERT(po->po_curbuf[curcpu] == NULL, 263 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po)); 264 265 domain = curdomain; 266 MPASS(pmc_dom_hdrs[domain]); 267 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 268 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) 269 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 270 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 271 272 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb); 273 274 #ifdef HWPMC_DEBUG 275 if (plb) 276 KASSERT(plb->plb_ptr == plb->plb_base && 277 plb->plb_base < plb->plb_fence, 278 ("[pmclog,%d] po=%p buffer invariants: ptr=%p " 279 "base=%p fence=%p", __LINE__, po, plb->plb_ptr, 280 plb->plb_base, plb->plb_fence)); 281 #endif 282 283 po->po_curbuf[curcpu] = plb; 284 285 /* update stats */ 286 counter_u64_add(pmc_stats.pm_buffer_requests, 1); 287 if (plb == NULL) 288 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1); 289 290 return (plb ? 0 : ENOMEM); 291 } 292 293 struct pmclog_proc_init_args { 294 struct proc *kthr; 295 struct pmc_owner *po; 296 bool exit; 297 bool acted; 298 }; 299 300 int 301 pmclog_proc_create(struct thread *td, void **handlep) 302 { 303 struct pmclog_proc_init_args *ia; 304 int error; 305 306 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO); 307 error = kproc_create(pmclog_loop, ia, &ia->kthr, 308 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid); 309 if (error == 0) 310 *handlep = ia; 311 return (error); 312 } 313 314 void 315 pmclog_proc_ignite(void *handle, struct pmc_owner *po) 316 { 317 struct pmclog_proc_init_args *ia; 318 319 ia = handle; 320 mtx_lock(&pmc_kthread_mtx); 321 MPASS(!ia->acted); 322 MPASS(ia->po == NULL); 323 MPASS(!ia->exit); 324 MPASS(ia->kthr != NULL); 325 if (po == NULL) { 326 ia->exit = true; 327 } else { 328 ia->po = po; 329 KASSERT(po->po_kthread == NULL, 330 ("[pmclog,%d] po=%p kthread (%p) already present", 331 __LINE__, po, po->po_kthread)); 332 po->po_kthread = ia->kthr; 333 } 334 wakeup(ia); 335 while (!ia->acted) 336 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0); 337 mtx_unlock(&pmc_kthread_mtx); 338 free(ia, M_TEMP); 339 } 340 341 /* 342 * Log handler loop. 343 * 344 * This function is executed by each pmc owner's helper thread. 345 */ 346 static void 347 pmclog_loop(void *arg) 348 { 349 struct pmclog_proc_init_args *ia; 350 struct pmc_owner *po; 351 struct pmclog_buffer *lb; 352 struct proc *p; 353 struct ucred *ownercred; 354 struct ucred *mycred; 355 struct thread *td; 356 sigset_t unb; 357 struct uio auio; 358 struct iovec aiov; 359 size_t nbytes; 360 int error; 361 362 td = curthread; 363 364 SIGEMPTYSET(unb); 365 SIGADDSET(unb, SIGHUP); 366 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0); 367 368 ia = arg; 369 MPASS(ia->kthr == curproc); 370 MPASS(!ia->acted); 371 mtx_lock(&pmc_kthread_mtx); 372 while (ia->po == NULL && !ia->exit) 373 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0); 374 if (ia->exit) { 375 ia->acted = true; 376 wakeup(ia); 377 mtx_unlock(&pmc_kthread_mtx); 378 kproc_exit(0); 379 } 380 MPASS(ia->po != NULL); 381 po = ia->po; 382 ia->acted = true; 383 wakeup(ia); 384 mtx_unlock(&pmc_kthread_mtx); 385 ia = NULL; 386 387 p = po->po_owner; 388 mycred = td->td_ucred; 389 390 PROC_LOCK(p); 391 ownercred = crhold(p->p_ucred); 392 PROC_UNLOCK(p); 393 394 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread); 395 KASSERT(po->po_kthread == curthread->td_proc, 396 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__, 397 po, po->po_kthread, curthread->td_proc)); 398 399 lb = NULL; 400 401 402 /* 403 * Loop waiting for I/O requests to be added to the owner 404 * struct's queue. The loop is exited when the log file 405 * is deconfigured. 406 */ 407 408 mtx_lock(&pmc_kthread_mtx); 409 410 for (;;) { 411 412 /* check if we've been asked to exit */ 413 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 414 break; 415 416 if (lb == NULL) { /* look for a fresh buffer to write */ 417 mtx_lock_spin(&po->po_mtx); 418 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) { 419 mtx_unlock_spin(&po->po_mtx); 420 421 /* No more buffers and shutdown required. */ 422 if (po->po_flags & PMC_PO_SHUTDOWN) 423 break; 424 425 (void) msleep(po, &pmc_kthread_mtx, PWAIT, 426 "pmcloop", 250); 427 continue; 428 } 429 430 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 431 mtx_unlock_spin(&po->po_mtx); 432 } 433 434 mtx_unlock(&pmc_kthread_mtx); 435 436 /* process the request */ 437 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po, 438 lb->plb_base, lb->plb_ptr); 439 /* change our thread's credentials before issuing the I/O */ 440 441 aiov.iov_base = lb->plb_base; 442 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base; 443 444 auio.uio_iov = &aiov; 445 auio.uio_iovcnt = 1; 446 auio.uio_offset = -1; 447 auio.uio_resid = nbytes; 448 auio.uio_rw = UIO_WRITE; 449 auio.uio_segflg = UIO_SYSSPACE; 450 auio.uio_td = td; 451 452 /* switch thread credentials -- see kern_ktrace.c */ 453 td->td_ucred = ownercred; 454 error = fo_write(po->po_file, &auio, ownercred, 0, td); 455 td->td_ucred = mycred; 456 457 if (error) { 458 /* XXX some errors are recoverable */ 459 /* send a SIGIO to the owner and exit */ 460 PROC_LOCK(p); 461 kern_psignal(p, SIGIO); 462 PROC_UNLOCK(p); 463 464 mtx_lock(&pmc_kthread_mtx); 465 466 po->po_error = error; /* save for flush log */ 467 468 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error); 469 470 break; 471 } 472 473 mtx_lock(&pmc_kthread_mtx); 474 475 /* put the used buffer back into the global pool */ 476 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 477 478 pmc_plb_rele(lb); 479 lb = NULL; 480 } 481 482 wakeup_one(po->po_kthread); 483 po->po_kthread = NULL; 484 485 mtx_unlock(&pmc_kthread_mtx); 486 487 /* return the current I/O buffer to the global pool */ 488 if (lb) { 489 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 490 491 pmc_plb_rele(lb); 492 } 493 494 /* 495 * Exit this thread, signalling the waiter 496 */ 497 498 crfree(ownercred); 499 500 kproc_exit(0); 501 } 502 503 /* 504 * Release and log entry and schedule an I/O if needed. 505 */ 506 507 static void 508 pmclog_release_flags(struct pmc_owner *po, int wakeup) 509 { 510 struct pmclog_buffer *plb; 511 512 plb = po->po_curbuf[curcpu]; 513 KASSERT(plb->plb_ptr >= plb->plb_base, 514 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 515 po, plb->plb_ptr, plb->plb_base)); 516 KASSERT(plb->plb_ptr <= plb->plb_fence, 517 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 518 po, plb->plb_ptr, plb->plb_fence)); 519 520 /* schedule an I/O if we've filled a buffer */ 521 if (plb->plb_ptr >= plb->plb_fence) 522 pmclog_schedule_io(po, wakeup); 523 524 PMCDBG1(LOG,REL,1, "po=%p", po); 525 } 526 527 static void 528 pmclog_release(struct pmc_owner *po) 529 { 530 531 pmclog_release_flags(po, 1); 532 } 533 534 535 /* 536 * Attempt to reserve 'length' bytes of space in an owner's log 537 * buffer. The function returns a pointer to 'length' bytes of space 538 * if there was enough space or returns NULL if no space was 539 * available. Non-null returns do so with the po mutex locked. The 540 * caller must invoke pmclog_release() on the pmc owner structure 541 * when done. 542 */ 543 544 static uint32_t * 545 pmclog_reserve(struct pmc_owner *po, int length) 546 { 547 uintptr_t newptr, oldptr; 548 uint32_t *lh; 549 struct timespec ts; 550 struct pmclog_buffer *plb, **pplb; 551 552 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length); 553 554 KASSERT(length % sizeof(uint32_t) == 0, 555 ("[pmclog,%d] length not a multiple of word size", __LINE__)); 556 557 /* No more data when shutdown in progress. */ 558 if (po->po_flags & PMC_PO_SHUTDOWN) 559 return (NULL); 560 561 pplb = &po->po_curbuf[curcpu]; 562 if (*pplb == NULL && pmclog_get_buffer(po) != 0) 563 goto fail; 564 565 KASSERT(*pplb != NULL, 566 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 567 568 plb = *pplb; 569 KASSERT(plb->plb_ptr >= plb->plb_base && 570 plb->plb_ptr <= plb->plb_fence, 571 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 572 __LINE__, po, plb->plb_ptr, plb->plb_base, 573 plb->plb_fence)); 574 575 oldptr = (uintptr_t) plb->plb_ptr; 576 newptr = oldptr + length; 577 578 KASSERT(oldptr != (uintptr_t) NULL, 579 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po)); 580 581 /* 582 * If we have space in the current buffer, return a pointer to 583 * available space with the PO structure locked. 584 */ 585 if (newptr <= (uintptr_t) plb->plb_fence) { 586 plb->plb_ptr = (char *) newptr; 587 goto done; 588 } 589 590 /* 591 * Otherwise, schedule the current buffer for output and get a 592 * fresh buffer. 593 */ 594 pmclog_schedule_io(po, 0); 595 596 if (pmclog_get_buffer(po) != 0) 597 goto fail; 598 599 plb = *pplb; 600 KASSERT(plb != NULL, 601 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 602 603 KASSERT(plb->plb_ptr != NULL, 604 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__)); 605 606 KASSERT(plb->plb_ptr == plb->plb_base && 607 plb->plb_ptr <= plb->plb_fence, 608 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 609 __LINE__, po, plb->plb_ptr, plb->plb_base, 610 plb->plb_fence)); 611 612 oldptr = (uintptr_t) plb->plb_ptr; 613 614 done: 615 lh = (uint32_t *) oldptr; 616 lh++; /* skip header */ 617 getnanotime(&ts); /* fill in the timestamp */ 618 *lh++ = ts.tv_sec & 0xFFFFFFFF; 619 *lh++ = ts.tv_nsec & 0xFFFFFFF; 620 return ((uint32_t *) oldptr); 621 fail: 622 return (NULL); 623 } 624 625 /* 626 * Schedule an I/O. 627 * 628 * Transfer the current buffer to the helper kthread. 629 */ 630 631 static void 632 pmclog_schedule_io(struct pmc_owner *po, int wakeup) 633 { 634 struct pmclog_buffer *plb; 635 636 plb = po->po_curbuf[curcpu]; 637 po->po_curbuf[curcpu] = NULL; 638 KASSERT(plb != NULL, 639 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po)); 640 KASSERT(plb->plb_ptr >= plb->plb_base, 641 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 642 po, plb->plb_ptr, plb->plb_base)); 643 KASSERT(plb->plb_ptr <= plb->plb_fence, 644 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 645 po, plb->plb_ptr, plb->plb_fence)); 646 647 PMCDBG1(LOG,SIO, 1, "po=%p", po); 648 649 /* 650 * Add the current buffer to the tail of the buffer list and 651 * wakeup the helper. 652 */ 653 mtx_lock_spin(&po->po_mtx); 654 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next); 655 mtx_unlock_spin(&po->po_mtx); 656 if (wakeup) 657 wakeup_one(po); 658 } 659 660 /* 661 * Stop the helper kthread. 662 */ 663 664 static void 665 pmclog_stop_kthread(struct pmc_owner *po) 666 { 667 668 mtx_lock(&pmc_kthread_mtx); 669 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 670 if (po->po_kthread != NULL) { 671 PROC_LOCK(po->po_kthread); 672 kern_psignal(po->po_kthread, SIGHUP); 673 PROC_UNLOCK(po->po_kthread); 674 } 675 wakeup_one(po); 676 while (po->po_kthread) 677 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0); 678 mtx_unlock(&pmc_kthread_mtx); 679 } 680 681 /* 682 * Public functions 683 */ 684 685 /* 686 * Configure a log file for pmc owner 'po'. 687 * 688 * Parameter 'logfd' is a file handle referencing an open file in the 689 * owner process. This file needs to have been opened for writing. 690 */ 691 692 int 693 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) 694 { 695 struct proc *p; 696 int error; 697 698 sx_assert(&pmc_sx, SA_XLOCKED); 699 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); 700 701 p = po->po_owner; 702 703 /* return EBUSY if a log file was already present */ 704 if (po->po_flags & PMC_PO_OWNS_LOGFILE) 705 return (EBUSY); 706 707 KASSERT(po->po_file == NULL, 708 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, 709 po->po_file)); 710 711 /* get a reference to the file state */ 712 error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file); 713 if (error) 714 goto error; 715 716 /* mark process as owning a log file */ 717 po->po_flags |= PMC_PO_OWNS_LOGFILE; 718 719 /* mark process as using HWPMCs */ 720 PROC_LOCK(p); 721 p->p_flag |= P_HWPMC; 722 PROC_UNLOCK(p); 723 724 /* create a log initialization entry */ 725 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE, 726 sizeof(struct pmclog_initialize)); 727 PMCLOG_EMIT32(PMC_VERSION); 728 PMCLOG_EMIT32(md->pmd_cputype); 729 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN); 730 PMCLOG_DESPATCH_SYNC(po); 731 732 return (0); 733 734 error: 735 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " 736 "stopped", __LINE__, po)); 737 738 if (po->po_file) 739 (void) fdrop(po->po_file, curthread); 740 po->po_file = NULL; /* clear file and error state */ 741 po->po_error = 0; 742 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 743 744 return (error); 745 } 746 747 748 /* 749 * De-configure a log file. This will throw away any buffers queued 750 * for this owner process. 751 */ 752 753 int 754 pmclog_deconfigure_log(struct pmc_owner *po) 755 { 756 int error; 757 struct pmclog_buffer *lb; 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 for (int i = 0; i < mp_ncpus; i++) { 782 thread_lock(curthread); 783 sched_bind(curthread, i); 784 thread_unlock(curthread); 785 /* return the 'current' buffer to the global pool */ 786 if ((lb = po->po_curbuf[curcpu]) != NULL) { 787 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 788 pmc_plb_rele(lb); 789 } 790 } 791 thread_lock(curthread); 792 sched_unbind(curthread); 793 thread_unlock(curthread); 794 795 /* drop a reference to the fd */ 796 if (po->po_file != NULL) { 797 error = fdrop(po->po_file, curthread); 798 po->po_file = NULL; 799 } else 800 error = 0; 801 po->po_error = 0; 802 803 return (error); 804 } 805 806 /* 807 * Flush a process' log buffer. 808 */ 809 810 int 811 pmclog_flush(struct pmc_owner *po, int force) 812 { 813 int error; 814 815 PMCDBG1(LOG,FLS,1, "po=%p", po); 816 817 /* 818 * If there is a pending error recorded by the logger thread, 819 * return that. 820 */ 821 if (po->po_error) 822 return (po->po_error); 823 824 error = 0; 825 826 /* 827 * Check that we do have an active log file. 828 */ 829 mtx_lock(&pmc_kthread_mtx); 830 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 831 error = EINVAL; 832 goto error; 833 } 834 835 pmclog_schedule_all(po, force); 836 error: 837 mtx_unlock(&pmc_kthread_mtx); 838 839 return (error); 840 } 841 842 static void 843 pmclog_schedule_one_cond(struct pmc_owner *po, int force) 844 { 845 struct pmclog_buffer *plb; 846 int cpu; 847 848 spinlock_enter(); 849 cpu = curcpu; 850 /* tell hardclock not to run again */ 851 if (PMC_CPU_HAS_SAMPLES(cpu)) 852 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); 853 if (force) 854 pmc_flush_samples(cpu); 855 plb = po->po_curbuf[cpu]; 856 if (plb && plb->plb_ptr != plb->plb_base) 857 pmclog_schedule_io(po, 1); 858 spinlock_exit(); 859 } 860 861 static void 862 pmclog_schedule_all(struct pmc_owner *po, int force) 863 { 864 /* 865 * Schedule the current buffer if any and not empty. 866 */ 867 for (int i = 0; i < mp_ncpus; i++) { 868 thread_lock(curthread); 869 sched_bind(curthread, i); 870 thread_unlock(curthread); 871 pmclog_schedule_one_cond(po, force); 872 } 873 thread_lock(curthread); 874 sched_unbind(curthread); 875 thread_unlock(curthread); 876 } 877 878 int 879 pmclog_close(struct pmc_owner *po) 880 { 881 882 PMCDBG1(LOG,CLO,1, "po=%p", po); 883 884 pmclog_process_closelog(po); 885 886 mtx_lock(&pmc_kthread_mtx); 887 /* 888 * Initiate shutdown: no new data queued, 889 * thread will close file on last block. 890 */ 891 po->po_flags |= PMC_PO_SHUTDOWN; 892 /* give time for all to see */ 893 DELAY(50); 894 895 /* 896 * Schedule the current buffer. 897 */ 898 pmclog_schedule_all(po, 0); 899 wakeup_one(po); 900 901 mtx_unlock(&pmc_kthread_mtx); 902 903 return (0); 904 } 905 906 void 907 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps) 908 { 909 int n, recordlen; 910 uint32_t flags; 911 struct pmc_owner *po; 912 913 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid, 914 ps->ps_nsamples); 915 916 recordlen = offsetof(struct pmclog_callchain, pl_pc) + 917 ps->ps_nsamples * sizeof(uintfptr_t); 918 po = pm->pm_owner; 919 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags); 920 PMCLOG_RESERVE_SAFE(po, CALLCHAIN, recordlen); 921 PMCLOG_EMIT32(ps->ps_pid); 922 PMCLOG_EMIT32(ps->ps_tid); 923 PMCLOG_EMIT32(pm->pm_id); 924 PMCLOG_EMIT32(flags); 925 /* unused for now */ 926 PMCLOG_EMIT32(0); 927 for (n = 0; n < ps->ps_nsamples; n++) 928 PMCLOG_EMITADDR(ps->ps_pc[n]); 929 PMCLOG_DESPATCH_SAFE(po); 930 } 931 932 void 933 pmclog_process_closelog(struct pmc_owner *po) 934 { 935 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog)); 936 PMCLOG_DESPATCH_SYNC(po); 937 } 938 939 void 940 pmclog_process_dropnotify(struct pmc_owner *po) 941 { 942 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify)); 943 PMCLOG_DESPATCH(po); 944 } 945 946 void 947 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start, 948 const char *path) 949 { 950 int pathlen, recordlen; 951 952 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__)); 953 954 pathlen = strlen(path) + 1; /* #bytes for path name */ 955 recordlen = offsetof(struct pmclog_map_in, pl_pathname) + 956 pathlen; 957 958 PMCLOG_RESERVE(po, MAP_IN, recordlen); 959 PMCLOG_EMIT32(pid); 960 PMCLOG_EMITADDR(start); 961 PMCLOG_EMITSTRING(path,pathlen); 962 PMCLOG_DESPATCH_SYNC(po); 963 } 964 965 void 966 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start, 967 uintfptr_t end) 968 { 969 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__)); 970 971 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out)); 972 PMCLOG_EMIT32(pid); 973 PMCLOG_EMITADDR(start); 974 PMCLOG_EMITADDR(end); 975 PMCLOG_DESPATCH(po); 976 } 977 978 void 979 pmclog_process_pmcallocate(struct pmc *pm) 980 { 981 struct pmc_owner *po; 982 struct pmc_soft *ps; 983 984 po = pm->pm_owner; 985 986 PMCDBG1(LOG,ALL,1, "pm=%p", pm); 987 988 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { 989 PMCLOG_RESERVE(po, PMCALLOCATEDYN, 990 sizeof(struct pmclog_pmcallocatedyn)); 991 PMCLOG_EMIT32(pm->pm_id); 992 PMCLOG_EMIT32(pm->pm_event); 993 PMCLOG_EMIT32(pm->pm_flags); 994 ps = pmc_soft_ev_acquire(pm->pm_event); 995 if (ps != NULL) 996 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); 997 else 998 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); 999 pmc_soft_ev_release(ps); 1000 PMCLOG_DESPATCH_SYNC(po); 1001 } else { 1002 PMCLOG_RESERVE(po, PMCALLOCATE, 1003 sizeof(struct pmclog_pmcallocate)); 1004 PMCLOG_EMIT32(pm->pm_id); 1005 PMCLOG_EMIT32(pm->pm_event); 1006 PMCLOG_EMIT32(pm->pm_flags); 1007 PMCLOG_DESPATCH_SYNC(po); 1008 } 1009 } 1010 1011 void 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, PMCATTACH, recordlen); 1025 PMCLOG_EMIT32(pm->pm_id); 1026 PMCLOG_EMIT32(pid); 1027 PMCLOG_EMIT32(0); 1028 PMCLOG_EMITSTRING(path, pathlen); 1029 PMCLOG_DESPATCH_SYNC(po); 1030 } 1031 1032 void 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, PMCDETACH, sizeof(struct pmclog_pmcdetach)); 1042 PMCLOG_EMIT32(pm->pm_id); 1043 PMCLOG_EMIT32(pid); 1044 PMCLOG_DESPATCH_SYNC(po); 1045 } 1046 1047 void 1048 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync) 1049 { 1050 if (sync) { 1051 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); 1052 PMCLOG_EMIT32(p->p_pid); 1053 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1054 PMCLOG_DESPATCH_SYNC(po); 1055 } else { 1056 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); 1057 PMCLOG_EMIT32(p->p_pid); 1058 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1059 PMCLOG_DESPATCH(po); 1060 } 1061 } 1062 1063 /* 1064 * Log a context switch event to the log file. 1065 */ 1066 1067 void 1068 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td) 1069 { 1070 struct pmc_owner *po; 1071 1072 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW, 1073 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__)); 1074 1075 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1076 v); 1077 1078 po = pm->pm_owner; 1079 1080 PMCLOG_RESERVE_SAFE(po, PROCCSW, sizeof(struct pmclog_proccsw)); 1081 PMCLOG_EMIT32(pm->pm_id); 1082 PMCLOG_EMIT64(v); 1083 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1084 PMCLOG_EMIT32(td->td_tid); 1085 PMCLOG_DESPATCH_SCHED_LOCK(po); 1086 } 1087 1088 void 1089 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid, 1090 uintfptr_t startaddr, char *path) 1091 { 1092 int pathlen, recordlen; 1093 1094 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path); 1095 1096 pathlen = strlen(path) + 1; /* #bytes for the path */ 1097 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen; 1098 PMCLOG_RESERVE(po, PROCEXEC, recordlen); 1099 PMCLOG_EMIT32(pid); 1100 PMCLOG_EMIT32(pmid); 1101 PMCLOG_EMIT32(0); 1102 PMCLOG_EMITADDR(startaddr); 1103 PMCLOG_EMITSTRING(path,pathlen); 1104 PMCLOG_DESPATCH_SYNC(po); 1105 } 1106 1107 /* 1108 * Log a process exit event (and accumulated pmc value) to the log file. 1109 */ 1110 1111 void 1112 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp) 1113 { 1114 int ri; 1115 struct pmc_owner *po; 1116 1117 ri = PMC_TO_ROWINDEX(pm); 1118 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1119 pp->pp_pmcs[ri].pp_pmcval); 1120 1121 po = pm->pm_owner; 1122 1123 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit)); 1124 PMCLOG_EMIT32(pm->pm_id); 1125 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1126 PMCLOG_EMIT32(0); 1127 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval); 1128 PMCLOG_DESPATCH(po); 1129 } 1130 1131 /* 1132 * Log a fork event. 1133 */ 1134 1135 void 1136 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid) 1137 { 1138 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork)); 1139 PMCLOG_EMIT32(oldpid); 1140 PMCLOG_EMIT32(newpid); 1141 PMCLOG_DESPATCH(po); 1142 } 1143 1144 /* 1145 * Log a process exit event of the form suitable for system-wide PMCs. 1146 */ 1147 1148 void 1149 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid) 1150 { 1151 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit)); 1152 PMCLOG_EMIT32(pid); 1153 PMCLOG_DESPATCH(po); 1154 } 1155 1156 void 1157 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync) 1158 { 1159 struct proc *p; 1160 1161 p = td->td_proc; 1162 if (sync) { 1163 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); 1164 PMCLOG_EMIT32(td->td_tid); 1165 PMCLOG_EMIT32(p->p_pid); 1166 PMCLOG_EMIT32(0); 1167 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1168 PMCLOG_DESPATCH_SYNC(po); 1169 } else { 1170 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); 1171 PMCLOG_EMIT32(td->td_tid); 1172 PMCLOG_EMIT32(p->p_pid); 1173 PMCLOG_EMIT32(0); 1174 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1175 PMCLOG_DESPATCH(po); 1176 } 1177 } 1178 1179 void 1180 pmclog_process_threadexit(struct pmc_owner *po, struct thread *td) 1181 { 1182 1183 PMCLOG_RESERVE(po, THR_EXIT, sizeof(struct pmclog_threadexit)); 1184 PMCLOG_EMIT32(td->td_tid); 1185 PMCLOG_DESPATCH(po); 1186 } 1187 1188 /* 1189 * Write a user log entry. 1190 */ 1191 1192 int 1193 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) 1194 { 1195 int error; 1196 1197 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); 1198 1199 error = 0; 1200 1201 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA, 1202 sizeof(struct pmclog_userdata)); 1203 PMCLOG_EMIT32(wl->pm_userdata); 1204 PMCLOG_DESPATCH(po); 1205 1206 error: 1207 return (error); 1208 } 1209 1210 /* 1211 * Initialization. 1212 * 1213 * Create a pool of log buffers and initialize mutexes. 1214 */ 1215 1216 void 1217 pmclog_initialize() 1218 { 1219 int domain; 1220 struct pmclog_buffer *plb; 1221 1222 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) { 1223 (void) printf("hwpmc: tunable logbuffersize=%d must be " 1224 "greater than zero and less than or equal to 16MB.\n", 1225 pmclog_buffer_size); 1226 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1227 } 1228 1229 if (pmc_nlogbuffers_pcpu <= 0) { 1230 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater " 1231 "than zero.\n", pmc_nlogbuffers_pcpu); 1232 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1233 } 1234 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) { 1235 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n", 1236 pmc_nlogbuffers_pcpu*pmclog_buffer_size); 1237 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1238 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1239 } 1240 for (domain = 0; domain < NDOMAINS; domain++) { 1241 int ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus; 1242 int total = ncpus*pmc_nlogbuffers_pcpu; 1243 1244 plb = malloc_domain(sizeof(struct pmclog_buffer)*total, M_PMC, domain, M_WAITOK|M_ZERO); 1245 pmc_dom_hdrs[domain]->pdbh_plbs = plb; 1246 for (int i = 0; i < total; i++, plb++) { 1247 void *buf; 1248 1249 buf = malloc_domain(1024 * pmclog_buffer_size, M_PMC, domain, 1250 M_WAITOK|M_ZERO); 1251 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain); 1252 pmc_plb_rele_unlocked(plb); 1253 } 1254 } 1255 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF); 1256 } 1257 1258 /* 1259 * Shutdown logging. 1260 * 1261 * Destroy mutexes and release memory back the to free pool. 1262 */ 1263 1264 void 1265 pmclog_shutdown() 1266 { 1267 struct pmclog_buffer *plb; 1268 int domain; 1269 1270 mtx_destroy(&pmc_kthread_mtx); 1271 1272 for (domain = 0; domain < NDOMAINS; domain++) { 1273 while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) { 1274 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 1275 free(plb->plb_base, M_PMC); 1276 } 1277 free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC); 1278 } 1279 } 1280