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 #if defined(__i386__) || defined(__amd64__) 65 #include <machine/clock.h> 66 #endif 67 68 #define curdomain PCPU_GET(domain) 69 70 /* 71 * Sysctl tunables 72 */ 73 74 SYSCTL_DECL(_kern_hwpmc); 75 76 /* 77 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers. 78 */ 79 80 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 81 #if (__FreeBSD_version < 1100000) 82 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size); 83 #endif 84 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN, 85 &pmclog_buffer_size, 0, "size of log buffers in kilobytes"); 86 87 /* 88 * kern.hwpmc.nbuffer -- number of global log buffers 89 */ 90 91 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 92 #if (__FreeBSD_version < 1100000) 93 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers_pcpu); 94 #endif 95 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN, 96 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu"); 97 98 /* 99 * Global log buffer list and associated spin lock. 100 */ 101 102 static struct mtx pmc_kthread_mtx; /* sleep lock */ 103 104 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \ 105 (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \ 106 (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \ 107 (D)->plb_domain = domain; \ 108 } while (0) 109 110 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \ 111 (D)->plb_ptr = (D)->plb_base; \ 112 } while (0) 113 114 /* 115 * Log file record constructors. 116 */ 117 #define _PMCLOG_TO_HEADER(T,L) \ 118 ((PMCLOG_HEADER_MAGIC << 24) | \ 119 (PMCLOG_TYPE_ ## T << 16) | \ 120 ((L) & 0xFFFF)) 121 122 /* reserve LEN bytes of space and initialize the entry header */ 123 #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION, TSC) do { \ 124 uint32_t *_le; \ 125 int _len = roundup((LEN), sizeof(uint32_t)); \ 126 struct pmclog_header *ph; \ 127 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 128 ACTION; \ 129 } \ 130 ph = (struct pmclog_header *)_le; \ 131 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 132 ph->pl_tsc = (TSC); \ 133 _le += sizeof(*ph)/4 /* skip over timestamp */ 134 135 /* reserve LEN bytes of space and initialize the entry header */ 136 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \ 137 uint32_t *_le; \ 138 int _len = roundup((LEN), sizeof(uint32_t)); \ 139 uint64_t tsc; \ 140 struct pmclog_header *ph; \ 141 tsc = pmc_rdtsc(); \ 142 spinlock_enter(); \ 143 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 144 spinlock_exit(); \ 145 ACTION; \ 146 } \ 147 ph = (struct pmclog_header *)_le; \ 148 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 149 ph->pl_tsc = tsc; \ 150 _le += sizeof(*ph)/4 /* skip over timestamp */ 151 152 153 154 #define PMCLOG_RESERVE_SAFE(P,T,L,TSC) _PMCLOG_RESERVE_SAFE(P,T,L,return,TSC) 155 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return) 156 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \ 157 error=ENOMEM;goto error) 158 159 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0) 160 #define PMCLOG_EMIT64(V) do { \ 161 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \ 162 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \ 163 } while (0) 164 165 166 /* Emit a string. Caution: does NOT update _le, so needs to be last */ 167 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) 168 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) 169 170 #define PMCLOG_DESPATCH_SAFE(PO) \ 171 pmclog_release((PO)); \ 172 } while (0) 173 174 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \ 175 pmclog_release_flags((PO), 0); \ 176 } while (0) 177 178 #define PMCLOG_DESPATCH(PO) \ 179 pmclog_release((PO)); \ 180 spinlock_exit(); \ 181 } while (0) 182 183 #define PMCLOG_DESPATCH_SYNC(PO) \ 184 pmclog_schedule_io((PO), 1); \ 185 spinlock_exit(); \ 186 } while (0) 187 188 189 #define TSDELTA 4 190 /* 191 * Assertions about the log file format. 192 */ 193 CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA + 194 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t)); 195 CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA); 196 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA); 197 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA + 198 5*4 + sizeof(uintfptr_t)); 199 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) == 200 5*4 + TSDELTA + sizeof(uintfptr_t)); 201 CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA); 202 CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA); 203 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA); 204 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA); 205 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA); 206 CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA); 207 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX + 208 sizeof(uintfptr_t) + TSDELTA); 209 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA + 210 sizeof(uintfptr_t)); 211 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA); 212 CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA); 213 CTASSERT(sizeof(struct pmclog_sysexit) == 6*4); 214 CTASSERT(sizeof(struct pmclog_userdata) == 6*4); 215 216 /* 217 * Log buffer structure 218 */ 219 220 struct pmclog_buffer { 221 TAILQ_ENTRY(pmclog_buffer) plb_next; 222 char *plb_base; 223 char *plb_ptr; 224 char *plb_fence; 225 uint16_t plb_domain; 226 } __aligned(CACHE_LINE_SIZE); 227 228 /* 229 * Prototypes 230 */ 231 232 static int pmclog_get_buffer(struct pmc_owner *po); 233 static void pmclog_loop(void *arg); 234 static void pmclog_release(struct pmc_owner *po); 235 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length); 236 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup); 237 static void pmclog_schedule_all(struct pmc_owner *po, int force); 238 static void pmclog_stop_kthread(struct pmc_owner *po); 239 240 /* 241 * Helper functions 242 */ 243 244 static inline void 245 pmc_plb_rele_unlocked(struct pmclog_buffer *plb) 246 { 247 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next); 248 } 249 250 static inline void 251 pmc_plb_rele(struct pmclog_buffer *plb) 252 { 253 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 254 pmc_plb_rele_unlocked(plb); 255 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 256 } 257 258 /* 259 * Get a log buffer 260 */ 261 static int 262 pmclog_get_buffer(struct pmc_owner *po) 263 { 264 struct pmclog_buffer *plb; 265 int domain; 266 267 KASSERT(po->po_curbuf[curcpu] == NULL, 268 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po)); 269 270 domain = curdomain; 271 MPASS(pmc_dom_hdrs[domain]); 272 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 273 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) 274 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 275 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 276 277 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb); 278 279 #ifdef HWPMC_DEBUG 280 if (plb) 281 KASSERT(plb->plb_ptr == plb->plb_base && 282 plb->plb_base < plb->plb_fence, 283 ("[pmclog,%d] po=%p buffer invariants: ptr=%p " 284 "base=%p fence=%p", __LINE__, po, plb->plb_ptr, 285 plb->plb_base, plb->plb_fence)); 286 #endif 287 288 po->po_curbuf[curcpu] = plb; 289 290 /* update stats */ 291 counter_u64_add(pmc_stats.pm_buffer_requests, 1); 292 if (plb == NULL) 293 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1); 294 295 return (plb ? 0 : ENOMEM); 296 } 297 298 struct pmclog_proc_init_args { 299 struct proc *kthr; 300 struct pmc_owner *po; 301 bool exit; 302 bool acted; 303 }; 304 305 int 306 pmclog_proc_create(struct thread *td, void **handlep) 307 { 308 struct pmclog_proc_init_args *ia; 309 int error; 310 311 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO); 312 error = kproc_create(pmclog_loop, ia, &ia->kthr, 313 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid); 314 if (error == 0) 315 *handlep = ia; 316 return (error); 317 } 318 319 void 320 pmclog_proc_ignite(void *handle, struct pmc_owner *po) 321 { 322 struct pmclog_proc_init_args *ia; 323 324 ia = handle; 325 mtx_lock(&pmc_kthread_mtx); 326 MPASS(!ia->acted); 327 MPASS(ia->po == NULL); 328 MPASS(!ia->exit); 329 MPASS(ia->kthr != NULL); 330 if (po == NULL) { 331 ia->exit = true; 332 } else { 333 ia->po = po; 334 KASSERT(po->po_kthread == NULL, 335 ("[pmclog,%d] po=%p kthread (%p) already present", 336 __LINE__, po, po->po_kthread)); 337 po->po_kthread = ia->kthr; 338 } 339 wakeup(ia); 340 while (!ia->acted) 341 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0); 342 mtx_unlock(&pmc_kthread_mtx); 343 free(ia, M_TEMP); 344 } 345 346 /* 347 * Log handler loop. 348 * 349 * This function is executed by each pmc owner's helper thread. 350 */ 351 static void 352 pmclog_loop(void *arg) 353 { 354 struct pmclog_proc_init_args *ia; 355 struct pmc_owner *po; 356 struct pmclog_buffer *lb; 357 struct proc *p; 358 struct ucred *ownercred; 359 struct ucred *mycred; 360 struct thread *td; 361 sigset_t unb; 362 struct uio auio; 363 struct iovec aiov; 364 size_t nbytes; 365 int error; 366 367 td = curthread; 368 369 SIGEMPTYSET(unb); 370 SIGADDSET(unb, SIGHUP); 371 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0); 372 373 ia = arg; 374 MPASS(ia->kthr == curproc); 375 MPASS(!ia->acted); 376 mtx_lock(&pmc_kthread_mtx); 377 while (ia->po == NULL && !ia->exit) 378 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0); 379 if (ia->exit) { 380 ia->acted = true; 381 wakeup(ia); 382 mtx_unlock(&pmc_kthread_mtx); 383 kproc_exit(0); 384 } 385 MPASS(ia->po != NULL); 386 po = ia->po; 387 ia->acted = true; 388 wakeup(ia); 389 mtx_unlock(&pmc_kthread_mtx); 390 ia = NULL; 391 392 p = po->po_owner; 393 mycred = td->td_ucred; 394 395 PROC_LOCK(p); 396 ownercred = crhold(p->p_ucred); 397 PROC_UNLOCK(p); 398 399 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread); 400 KASSERT(po->po_kthread == curthread->td_proc, 401 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__, 402 po, po->po_kthread, curthread->td_proc)); 403 404 lb = NULL; 405 406 407 /* 408 * Loop waiting for I/O requests to be added to the owner 409 * struct's queue. The loop is exited when the log file 410 * is deconfigured. 411 */ 412 413 mtx_lock(&pmc_kthread_mtx); 414 415 for (;;) { 416 417 /* check if we've been asked to exit */ 418 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 419 break; 420 421 if (lb == NULL) { /* look for a fresh buffer to write */ 422 mtx_lock_spin(&po->po_mtx); 423 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) { 424 mtx_unlock_spin(&po->po_mtx); 425 426 /* No more buffers and shutdown required. */ 427 if (po->po_flags & PMC_PO_SHUTDOWN) 428 break; 429 430 (void) msleep(po, &pmc_kthread_mtx, PWAIT, 431 "pmcloop", 250); 432 continue; 433 } 434 435 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 436 mtx_unlock_spin(&po->po_mtx); 437 } 438 439 mtx_unlock(&pmc_kthread_mtx); 440 441 /* process the request */ 442 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po, 443 lb->plb_base, lb->plb_ptr); 444 /* change our thread's credentials before issuing the I/O */ 445 446 aiov.iov_base = lb->plb_base; 447 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base; 448 449 auio.uio_iov = &aiov; 450 auio.uio_iovcnt = 1; 451 auio.uio_offset = -1; 452 auio.uio_resid = nbytes; 453 auio.uio_rw = UIO_WRITE; 454 auio.uio_segflg = UIO_SYSSPACE; 455 auio.uio_td = td; 456 457 /* switch thread credentials -- see kern_ktrace.c */ 458 td->td_ucred = ownercred; 459 error = fo_write(po->po_file, &auio, ownercred, 0, td); 460 td->td_ucred = mycred; 461 462 if (error) { 463 /* XXX some errors are recoverable */ 464 /* send a SIGIO to the owner and exit */ 465 PROC_LOCK(p); 466 kern_psignal(p, SIGIO); 467 PROC_UNLOCK(p); 468 469 mtx_lock(&pmc_kthread_mtx); 470 471 po->po_error = error; /* save for flush log */ 472 473 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error); 474 475 break; 476 } 477 478 mtx_lock(&pmc_kthread_mtx); 479 480 /* put the used buffer back into the global pool */ 481 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 482 483 pmc_plb_rele(lb); 484 lb = NULL; 485 } 486 487 wakeup_one(po->po_kthread); 488 po->po_kthread = NULL; 489 490 mtx_unlock(&pmc_kthread_mtx); 491 492 /* return the current I/O buffer to the global pool */ 493 if (lb) { 494 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 495 496 pmc_plb_rele(lb); 497 } 498 499 /* 500 * Exit this thread, signalling the waiter 501 */ 502 503 crfree(ownercred); 504 505 kproc_exit(0); 506 } 507 508 /* 509 * Release and log entry and schedule an I/O if needed. 510 */ 511 512 static void 513 pmclog_release_flags(struct pmc_owner *po, int wakeup) 514 { 515 struct pmclog_buffer *plb; 516 517 plb = po->po_curbuf[curcpu]; 518 KASSERT(plb->plb_ptr >= plb->plb_base, 519 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 520 po, plb->plb_ptr, plb->plb_base)); 521 KASSERT(plb->plb_ptr <= plb->plb_fence, 522 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 523 po, plb->plb_ptr, plb->plb_fence)); 524 525 /* schedule an I/O if we've filled a buffer */ 526 if (plb->plb_ptr >= plb->plb_fence) 527 pmclog_schedule_io(po, wakeup); 528 529 PMCDBG1(LOG,REL,1, "po=%p", po); 530 } 531 532 static void 533 pmclog_release(struct pmc_owner *po) 534 { 535 536 pmclog_release_flags(po, 1); 537 } 538 539 540 /* 541 * Attempt to reserve 'length' bytes of space in an owner's log 542 * buffer. The function returns a pointer to 'length' bytes of space 543 * if there was enough space or returns NULL if no space was 544 * available. Non-null returns do so with the po mutex locked. The 545 * caller must invoke pmclog_release() on the pmc owner structure 546 * when done. 547 */ 548 549 static uint32_t * 550 pmclog_reserve(struct pmc_owner *po, int length) 551 { 552 uintptr_t newptr, oldptr; 553 struct pmclog_buffer *plb, **pplb; 554 555 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length); 556 557 KASSERT(length % sizeof(uint32_t) == 0, 558 ("[pmclog,%d] length not a multiple of word size", __LINE__)); 559 560 /* No more data when shutdown in progress. */ 561 if (po->po_flags & PMC_PO_SHUTDOWN) 562 return (NULL); 563 564 pplb = &po->po_curbuf[curcpu]; 565 if (*pplb == NULL && pmclog_get_buffer(po) != 0) 566 goto fail; 567 568 KASSERT(*pplb != NULL, 569 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 570 571 plb = *pplb; 572 KASSERT(plb->plb_ptr >= plb->plb_base && 573 plb->plb_ptr <= plb->plb_fence, 574 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 575 __LINE__, po, plb->plb_ptr, plb->plb_base, 576 plb->plb_fence)); 577 578 oldptr = (uintptr_t) plb->plb_ptr; 579 newptr = oldptr + length; 580 581 KASSERT(oldptr != (uintptr_t) NULL, 582 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po)); 583 584 /* 585 * If we have space in the current buffer, return a pointer to 586 * available space with the PO structure locked. 587 */ 588 if (newptr <= (uintptr_t) plb->plb_fence) { 589 plb->plb_ptr = (char *) newptr; 590 goto done; 591 } 592 593 /* 594 * Otherwise, schedule the current buffer for output and get a 595 * fresh buffer. 596 */ 597 pmclog_schedule_io(po, 0); 598 599 if (pmclog_get_buffer(po) != 0) 600 goto fail; 601 602 plb = *pplb; 603 KASSERT(plb != NULL, 604 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 605 606 KASSERT(plb->plb_ptr != NULL, 607 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__)); 608 609 KASSERT(plb->plb_ptr == plb->plb_base && 610 plb->plb_ptr <= plb->plb_fence, 611 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 612 __LINE__, po, plb->plb_ptr, plb->plb_base, 613 plb->plb_fence)); 614 615 oldptr = (uintptr_t) plb->plb_ptr; 616 617 done: 618 return ((uint32_t *) oldptr); 619 fail: 620 return (NULL); 621 } 622 623 /* 624 * Schedule an I/O. 625 * 626 * Transfer the current buffer to the helper kthread. 627 */ 628 629 static void 630 pmclog_schedule_io(struct pmc_owner *po, int wakeup) 631 { 632 struct pmclog_buffer *plb; 633 634 plb = po->po_curbuf[curcpu]; 635 po->po_curbuf[curcpu] = NULL; 636 KASSERT(plb != NULL, 637 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po)); 638 KASSERT(plb->plb_ptr >= plb->plb_base, 639 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 640 po, plb->plb_ptr, plb->plb_base)); 641 KASSERT(plb->plb_ptr <= plb->plb_fence, 642 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 643 po, plb->plb_ptr, plb->plb_fence)); 644 645 PMCDBG1(LOG,SIO, 1, "po=%p", po); 646 647 /* 648 * Add the current buffer to the tail of the buffer list and 649 * wakeup the helper. 650 */ 651 mtx_lock_spin(&po->po_mtx); 652 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next); 653 mtx_unlock_spin(&po->po_mtx); 654 if (wakeup) 655 wakeup_one(po); 656 } 657 658 /* 659 * Stop the helper kthread. 660 */ 661 662 static void 663 pmclog_stop_kthread(struct pmc_owner *po) 664 { 665 666 mtx_lock(&pmc_kthread_mtx); 667 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 668 if (po->po_kthread != NULL) { 669 PROC_LOCK(po->po_kthread); 670 kern_psignal(po->po_kthread, SIGHUP); 671 PROC_UNLOCK(po->po_kthread); 672 } 673 wakeup_one(po); 674 while (po->po_kthread) 675 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0); 676 mtx_unlock(&pmc_kthread_mtx); 677 } 678 679 /* 680 * Public functions 681 */ 682 683 /* 684 * Configure a log file for pmc owner 'po'. 685 * 686 * Parameter 'logfd' is a file handle referencing an open file in the 687 * owner process. This file needs to have been opened for writing. 688 */ 689 690 int 691 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) 692 { 693 struct proc *p; 694 struct timespec ts; 695 uint64_t tsc; 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 nanotime(&ts); 724 tsc = pmc_rdtsc(); 725 /* create a log initialization entry */ 726 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE, 727 sizeof(struct pmclog_initialize)); 728 PMCLOG_EMIT32(PMC_VERSION); 729 PMCLOG_EMIT32(md->pmd_cputype); 730 #if defined(__i386__) || defined(__amd64__) 731 PMCLOG_EMIT64(tsc_freq); 732 #else 733 /* other architectures will need to fill this in */ 734 PMCLOG_EMIT32(0); 735 PMCLOG_EMIT32(0); 736 #endif 737 memcpy(_le, &ts, sizeof(ts)); 738 _le += sizeof(ts)/4; 739 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN); 740 PMCLOG_DESPATCH_SYNC(po); 741 742 return (0); 743 744 error: 745 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " 746 "stopped", __LINE__, po)); 747 748 if (po->po_file) 749 (void) fdrop(po->po_file, curthread); 750 po->po_file = NULL; /* clear file and error state */ 751 po->po_error = 0; 752 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 753 754 return (error); 755 } 756 757 758 /* 759 * De-configure a log file. This will throw away any buffers queued 760 * for this owner process. 761 */ 762 763 int 764 pmclog_deconfigure_log(struct pmc_owner *po) 765 { 766 int error; 767 struct pmclog_buffer *lb; 768 769 PMCDBG1(LOG,CFG,1, "de-config po=%p", po); 770 771 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 772 return (EINVAL); 773 774 KASSERT(po->po_sscount == 0, 775 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po)); 776 KASSERT(po->po_file != NULL, 777 ("[pmclog,%d] po=%p no log file", __LINE__, po)); 778 779 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */ 780 pmclog_stop_kthread(po); 781 782 KASSERT(po->po_kthread == NULL, 783 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po)); 784 785 /* return all queued log buffers to the global pool */ 786 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) { 787 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 788 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 789 pmc_plb_rele(lb); 790 } 791 for (int i = 0; i < mp_ncpus; i++) { 792 thread_lock(curthread); 793 sched_bind(curthread, i); 794 thread_unlock(curthread); 795 /* return the 'current' buffer to the global pool */ 796 if ((lb = po->po_curbuf[curcpu]) != NULL) { 797 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 798 pmc_plb_rele(lb); 799 } 800 } 801 thread_lock(curthread); 802 sched_unbind(curthread); 803 thread_unlock(curthread); 804 805 /* drop a reference to the fd */ 806 if (po->po_file != NULL) { 807 error = fdrop(po->po_file, curthread); 808 po->po_file = NULL; 809 } else 810 error = 0; 811 po->po_error = 0; 812 813 return (error); 814 } 815 816 /* 817 * Flush a process' log buffer. 818 */ 819 820 int 821 pmclog_flush(struct pmc_owner *po, int force) 822 { 823 int error; 824 825 PMCDBG1(LOG,FLS,1, "po=%p", po); 826 827 /* 828 * If there is a pending error recorded by the logger thread, 829 * return that. 830 */ 831 if (po->po_error) 832 return (po->po_error); 833 834 error = 0; 835 836 /* 837 * Check that we do have an active log file. 838 */ 839 mtx_lock(&pmc_kthread_mtx); 840 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 841 error = EINVAL; 842 goto error; 843 } 844 845 pmclog_schedule_all(po, force); 846 error: 847 mtx_unlock(&pmc_kthread_mtx); 848 849 return (error); 850 } 851 852 static void 853 pmclog_schedule_one_cond(struct pmc_owner *po, int force) 854 { 855 struct pmclog_buffer *plb; 856 int cpu; 857 858 spinlock_enter(); 859 cpu = curcpu; 860 /* tell hardclock not to run again */ 861 if (PMC_CPU_HAS_SAMPLES(cpu)) 862 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); 863 if (force) 864 pmc_flush_samples(cpu); 865 plb = po->po_curbuf[cpu]; 866 if (plb && plb->plb_ptr != plb->plb_base) 867 pmclog_schedule_io(po, 1); 868 spinlock_exit(); 869 } 870 871 static void 872 pmclog_schedule_all(struct pmc_owner *po, int force) 873 { 874 /* 875 * Schedule the current buffer if any and not empty. 876 */ 877 for (int i = 0; i < mp_ncpus; i++) { 878 thread_lock(curthread); 879 sched_bind(curthread, i); 880 thread_unlock(curthread); 881 pmclog_schedule_one_cond(po, force); 882 } 883 thread_lock(curthread); 884 sched_unbind(curthread); 885 thread_unlock(curthread); 886 } 887 888 int 889 pmclog_close(struct pmc_owner *po) 890 { 891 892 PMCDBG1(LOG,CLO,1, "po=%p", po); 893 894 pmclog_process_closelog(po); 895 896 mtx_lock(&pmc_kthread_mtx); 897 /* 898 * Initiate shutdown: no new data queued, 899 * thread will close file on last block. 900 */ 901 po->po_flags |= PMC_PO_SHUTDOWN; 902 /* give time for all to see */ 903 DELAY(50); 904 905 /* 906 * Schedule the current buffer. 907 */ 908 pmclog_schedule_all(po, 0); 909 wakeup_one(po); 910 911 mtx_unlock(&pmc_kthread_mtx); 912 913 return (0); 914 } 915 916 void 917 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps) 918 { 919 int n, recordlen; 920 uint32_t flags; 921 struct pmc_owner *po; 922 923 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid, 924 ps->ps_nsamples); 925 926 recordlen = offsetof(struct pmclog_callchain, pl_pc) + 927 ps->ps_nsamples * sizeof(uintfptr_t); 928 po = pm->pm_owner; 929 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags); 930 PMCLOG_RESERVE_SAFE(po, CALLCHAIN, recordlen, ps->ps_tsc); 931 PMCLOG_EMIT32(ps->ps_pid); 932 PMCLOG_EMIT32(ps->ps_tid); 933 PMCLOG_EMIT32(pm->pm_id); 934 PMCLOG_EMIT32(flags); 935 for (n = 0; n < ps->ps_nsamples; n++) 936 PMCLOG_EMITADDR(ps->ps_pc[n]); 937 PMCLOG_DESPATCH_SAFE(po); 938 } 939 940 void 941 pmclog_process_closelog(struct pmc_owner *po) 942 { 943 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog)); 944 PMCLOG_DESPATCH_SYNC(po); 945 } 946 947 void 948 pmclog_process_dropnotify(struct pmc_owner *po) 949 { 950 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify)); 951 PMCLOG_DESPATCH(po); 952 } 953 954 void 955 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start, 956 const char *path) 957 { 958 int pathlen, recordlen; 959 960 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__)); 961 962 pathlen = strlen(path) + 1; /* #bytes for path name */ 963 recordlen = offsetof(struct pmclog_map_in, pl_pathname) + 964 pathlen; 965 966 PMCLOG_RESERVE(po, MAP_IN, recordlen); 967 PMCLOG_EMIT32(pid); 968 PMCLOG_EMIT32(0); 969 PMCLOG_EMITADDR(start); 970 PMCLOG_EMITSTRING(path,pathlen); 971 PMCLOG_DESPATCH_SYNC(po); 972 } 973 974 void 975 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start, 976 uintfptr_t end) 977 { 978 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__)); 979 980 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out)); 981 PMCLOG_EMIT32(pid); 982 PMCLOG_EMIT32(0); 983 PMCLOG_EMITADDR(start); 984 PMCLOG_EMITADDR(end); 985 PMCLOG_DESPATCH(po); 986 } 987 988 void 989 pmclog_process_pmcallocate(struct pmc *pm) 990 { 991 struct pmc_owner *po; 992 struct pmc_soft *ps; 993 994 po = pm->pm_owner; 995 996 PMCDBG1(LOG,ALL,1, "pm=%p", pm); 997 998 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { 999 PMCLOG_RESERVE(po, PMCALLOCATEDYN, 1000 sizeof(struct pmclog_pmcallocatedyn)); 1001 PMCLOG_EMIT32(pm->pm_id); 1002 PMCLOG_EMIT32(pm->pm_event); 1003 PMCLOG_EMIT32(pm->pm_flags); 1004 PMCLOG_EMIT32(0); 1005 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 1006 ps = pmc_soft_ev_acquire(pm->pm_event); 1007 if (ps != NULL) 1008 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); 1009 else 1010 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); 1011 pmc_soft_ev_release(ps); 1012 PMCLOG_DESPATCH_SYNC(po); 1013 } else { 1014 PMCLOG_RESERVE(po, PMCALLOCATE, 1015 sizeof(struct pmclog_pmcallocate)); 1016 PMCLOG_EMIT32(pm->pm_id); 1017 PMCLOG_EMIT32(pm->pm_event); 1018 PMCLOG_EMIT32(pm->pm_flags); 1019 PMCLOG_EMIT32(0); 1020 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 1021 PMCLOG_DESPATCH_SYNC(po); 1022 } 1023 } 1024 1025 void 1026 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path) 1027 { 1028 int pathlen, recordlen; 1029 struct pmc_owner *po; 1030 1031 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid); 1032 1033 po = pm->pm_owner; 1034 1035 pathlen = strlen(path) + 1; /* #bytes for the string */ 1036 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen; 1037 1038 PMCLOG_RESERVE(po, PMCATTACH, recordlen); 1039 PMCLOG_EMIT32(pm->pm_id); 1040 PMCLOG_EMIT32(pid); 1041 PMCLOG_EMITSTRING(path, pathlen); 1042 PMCLOG_DESPATCH_SYNC(po); 1043 } 1044 1045 void 1046 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid) 1047 { 1048 struct pmc_owner *po; 1049 1050 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid); 1051 1052 po = pm->pm_owner; 1053 1054 PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach)); 1055 PMCLOG_EMIT32(pm->pm_id); 1056 PMCLOG_EMIT32(pid); 1057 PMCLOG_DESPATCH_SYNC(po); 1058 } 1059 1060 void 1061 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync) 1062 { 1063 if (sync) { 1064 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); 1065 PMCLOG_EMIT32(p->p_pid); 1066 PMCLOG_EMIT32(p->p_flag); 1067 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1068 PMCLOG_DESPATCH_SYNC(po); 1069 } else { 1070 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); 1071 PMCLOG_EMIT32(p->p_pid); 1072 PMCLOG_EMIT32(p->p_flag); 1073 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1074 PMCLOG_DESPATCH(po); 1075 } 1076 } 1077 1078 /* 1079 * Log a context switch event to the log file. 1080 */ 1081 1082 void 1083 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td) 1084 { 1085 struct pmc_owner *po; 1086 1087 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW, 1088 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__)); 1089 1090 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1091 v); 1092 1093 po = pm->pm_owner; 1094 1095 PMCLOG_RESERVE_SAFE(po, PROCCSW, sizeof(struct pmclog_proccsw), pmc_rdtsc()); 1096 PMCLOG_EMIT64(v); 1097 PMCLOG_EMIT32(pm->pm_id); 1098 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1099 PMCLOG_EMIT32(td->td_tid); 1100 PMCLOG_EMIT32(0); 1101 PMCLOG_DESPATCH_SCHED_LOCK(po); 1102 } 1103 1104 void 1105 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid, 1106 uintfptr_t startaddr, char *path) 1107 { 1108 int pathlen, recordlen; 1109 1110 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path); 1111 1112 pathlen = strlen(path) + 1; /* #bytes for the path */ 1113 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen; 1114 PMCLOG_RESERVE(po, PROCEXEC, recordlen); 1115 PMCLOG_EMIT32(pid); 1116 PMCLOG_EMIT32(pmid); 1117 PMCLOG_EMITADDR(startaddr); 1118 PMCLOG_EMITSTRING(path,pathlen); 1119 PMCLOG_DESPATCH_SYNC(po); 1120 } 1121 1122 /* 1123 * Log a process exit event (and accumulated pmc value) to the log file. 1124 */ 1125 1126 void 1127 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp) 1128 { 1129 int ri; 1130 struct pmc_owner *po; 1131 1132 ri = PMC_TO_ROWINDEX(pm); 1133 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1134 pp->pp_pmcs[ri].pp_pmcval); 1135 1136 po = pm->pm_owner; 1137 1138 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit)); 1139 PMCLOG_EMIT32(pm->pm_id); 1140 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1141 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval); 1142 PMCLOG_DESPATCH(po); 1143 } 1144 1145 /* 1146 * Log a fork event. 1147 */ 1148 1149 void 1150 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid) 1151 { 1152 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork)); 1153 PMCLOG_EMIT32(oldpid); 1154 PMCLOG_EMIT32(newpid); 1155 PMCLOG_DESPATCH(po); 1156 } 1157 1158 /* 1159 * Log a process exit event of the form suitable for system-wide PMCs. 1160 */ 1161 1162 void 1163 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid) 1164 { 1165 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit)); 1166 PMCLOG_EMIT32(pid); 1167 PMCLOG_DESPATCH(po); 1168 } 1169 1170 void 1171 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync) 1172 { 1173 struct proc *p; 1174 1175 p = td->td_proc; 1176 if (sync) { 1177 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); 1178 PMCLOG_EMIT32(td->td_tid); 1179 PMCLOG_EMIT32(p->p_pid); 1180 PMCLOG_EMIT32(p->p_flag); 1181 PMCLOG_EMIT32(0); 1182 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1183 PMCLOG_DESPATCH_SYNC(po); 1184 } else { 1185 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); 1186 PMCLOG_EMIT32(td->td_tid); 1187 PMCLOG_EMIT32(p->p_pid); 1188 PMCLOG_EMIT32(p->p_flag); 1189 PMCLOG_EMIT32(0); 1190 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1191 PMCLOG_DESPATCH(po); 1192 } 1193 } 1194 1195 void 1196 pmclog_process_threadexit(struct pmc_owner *po, struct thread *td) 1197 { 1198 1199 PMCLOG_RESERVE(po, THR_EXIT, sizeof(struct pmclog_threadexit)); 1200 PMCLOG_EMIT32(td->td_tid); 1201 PMCLOG_DESPATCH(po); 1202 } 1203 1204 /* 1205 * Write a user log entry. 1206 */ 1207 1208 int 1209 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) 1210 { 1211 int error; 1212 1213 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); 1214 1215 error = 0; 1216 1217 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA, 1218 sizeof(struct pmclog_userdata)); 1219 PMCLOG_EMIT32(wl->pm_userdata); 1220 PMCLOG_DESPATCH(po); 1221 1222 error: 1223 return (error); 1224 } 1225 1226 /* 1227 * Initialization. 1228 * 1229 * Create a pool of log buffers and initialize mutexes. 1230 */ 1231 1232 void 1233 pmclog_initialize() 1234 { 1235 int domain; 1236 struct pmclog_buffer *plb; 1237 1238 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) { 1239 (void) printf("hwpmc: tunable logbuffersize=%d must be " 1240 "greater than zero and less than or equal to 16MB.\n", 1241 pmclog_buffer_size); 1242 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1243 } 1244 1245 if (pmc_nlogbuffers_pcpu <= 0) { 1246 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater " 1247 "than zero.\n", pmc_nlogbuffers_pcpu); 1248 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1249 } 1250 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) { 1251 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n", 1252 pmc_nlogbuffers_pcpu*pmclog_buffer_size); 1253 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1254 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1255 } 1256 for (domain = 0; domain < vm_ndomains; domain++) { 1257 int ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus; 1258 int total = ncpus*pmc_nlogbuffers_pcpu; 1259 1260 plb = malloc_domain(sizeof(struct pmclog_buffer)*total, M_PMC, domain, M_WAITOK|M_ZERO); 1261 pmc_dom_hdrs[domain]->pdbh_plbs = plb; 1262 for (int i = 0; i < total; i++, plb++) { 1263 void *buf; 1264 1265 buf = malloc_domain(1024 * pmclog_buffer_size, M_PMC, domain, 1266 M_WAITOK|M_ZERO); 1267 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain); 1268 pmc_plb_rele_unlocked(plb); 1269 } 1270 } 1271 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF); 1272 } 1273 1274 /* 1275 * Shutdown logging. 1276 * 1277 * Destroy mutexes and release memory back the to free pool. 1278 */ 1279 1280 void 1281 pmclog_shutdown() 1282 { 1283 struct pmclog_buffer *plb; 1284 int domain; 1285 1286 mtx_destroy(&pmc_kthread_mtx); 1287 1288 for (domain = 0; domain < vm_ndomains; domain++) { 1289 while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) { 1290 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 1291 free(plb->plb_base, M_PMC); 1292 } 1293 free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC); 1294 } 1295 } 1296