1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2005-2007 Joseph Koshy 5 * Copyright (c) 2007 The FreeBSD Foundation 6 * Copyright (c) 2018 Matthew Macy 7 * All rights reserved. 8 * 9 * Portions of this software were developed by A. Joseph Koshy under 10 * sponsorship from the FreeBSD Foundation and Google, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 */ 34 35 /* 36 * Logging code for hwpmc(4) 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/capsicum.h> 44 #include <sys/domainset.h> 45 #include <sys/file.h> 46 #include <sys/kernel.h> 47 #include <sys/kthread.h> 48 #include <sys/lock.h> 49 #include <sys/module.h> 50 #include <sys/mutex.h> 51 #include <sys/pmc.h> 52 #include <sys/pmckern.h> 53 #include <sys/pmclog.h> 54 #include <sys/proc.h> 55 #include <sys/sched.h> 56 #include <sys/signalvar.h> 57 #include <sys/smp.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 #include <sys/uio.h> 62 #include <sys/unistd.h> 63 #include <sys/vnode.h> 64 65 #if defined(__i386__) || defined(__amd64__) 66 #include <machine/clock.h> 67 #endif 68 69 #define curdomain PCPU_GET(domain) 70 71 /* 72 * Sysctl tunables 73 */ 74 75 SYSCTL_DECL(_kern_hwpmc); 76 77 /* 78 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers. 79 */ 80 81 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 82 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN, 83 &pmclog_buffer_size, 0, "size of log buffers in kilobytes"); 84 85 /* 86 * kern.hwpmc.nbuffers_pcpu -- number of global log buffers 87 */ 88 89 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 90 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN, 91 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu"); 92 93 /* 94 * Global log buffer list and associated spin lock. 95 */ 96 97 static struct mtx pmc_kthread_mtx; /* sleep lock */ 98 99 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \ 100 (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \ 101 (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \ 102 (D)->plb_domain = domain; \ 103 } while (0) 104 105 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \ 106 (D)->plb_ptr = (D)->plb_base; \ 107 } while (0) 108 109 /* 110 * Log file record constructors. 111 */ 112 #define _PMCLOG_TO_HEADER(T,L) \ 113 ((PMCLOG_HEADER_MAGIC << 24) | (T << 16) | ((L) & 0xFFFF)) 114 115 /* reserve LEN bytes of space and initialize the entry header */ 116 #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION, TSC) do { \ 117 uint32_t *_le; \ 118 int _len = roundup((LEN), sizeof(uint32_t)); \ 119 struct pmclog_header *ph; \ 120 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 121 ACTION; \ 122 } \ 123 ph = (struct pmclog_header *)_le; \ 124 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 125 ph->pl_tsc = (TSC); \ 126 _le += sizeof(*ph)/4 /* skip over timestamp */ 127 128 /* reserve LEN bytes of space and initialize the entry header */ 129 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \ 130 uint32_t *_le; \ 131 int _len = roundup((LEN), sizeof(uint32_t)); \ 132 uint64_t tsc; \ 133 struct pmclog_header *ph; \ 134 tsc = pmc_rdtsc(); \ 135 spinlock_enter(); \ 136 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 137 spinlock_exit(); \ 138 ACTION; \ 139 } \ 140 ph = (struct pmclog_header *)_le; \ 141 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 142 ph->pl_tsc = tsc; \ 143 _le += sizeof(*ph)/4 /* skip over timestamp */ 144 145 146 147 #define PMCLOG_RESERVE_SAFE(P,T,L,TSC) _PMCLOG_RESERVE_SAFE(P,T,L,return,TSC) 148 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return) 149 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \ 150 error=ENOMEM;goto error) 151 152 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0) 153 #define PMCLOG_EMIT64(V) do { \ 154 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \ 155 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \ 156 } while (0) 157 158 159 /* Emit a string. Caution: does NOT update _le, so needs to be last */ 160 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) 161 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) 162 163 #define PMCLOG_DESPATCH_SAFE(PO) \ 164 pmclog_release((PO)); \ 165 } while (0) 166 167 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \ 168 pmclog_release_flags((PO), 0); \ 169 } while (0) 170 171 #define PMCLOG_DESPATCH(PO) \ 172 pmclog_release((PO)); \ 173 spinlock_exit(); \ 174 } while (0) 175 176 #define PMCLOG_DESPATCH_SYNC(PO) \ 177 pmclog_schedule_io((PO), 1); \ 178 spinlock_exit(); \ 179 } while (0) 180 181 182 #define TSDELTA 4 183 /* 184 * Assertions about the log file format. 185 */ 186 CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA + 187 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t)); 188 CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA); 189 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA); 190 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA + 191 5*4 + sizeof(uintfptr_t)); 192 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) == 193 5*4 + TSDELTA + sizeof(uintfptr_t)); 194 CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA); 195 CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA); 196 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA); 197 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA); 198 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA); 199 CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA); 200 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX + 201 2*sizeof(uintptr_t) + TSDELTA); 202 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA + 203 2*sizeof(uintptr_t)); 204 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA); 205 CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA); 206 CTASSERT(sizeof(struct pmclog_sysexit) == 6*4); 207 CTASSERT(sizeof(struct pmclog_userdata) == 6*4); 208 209 /* 210 * Log buffer structure 211 */ 212 213 struct pmclog_buffer { 214 TAILQ_ENTRY(pmclog_buffer) plb_next; 215 char *plb_base; 216 char *plb_ptr; 217 char *plb_fence; 218 uint16_t plb_domain; 219 } __aligned(CACHE_LINE_SIZE); 220 221 /* 222 * Prototypes 223 */ 224 225 static int pmclog_get_buffer(struct pmc_owner *po); 226 static void pmclog_loop(void *arg); 227 static void pmclog_release(struct pmc_owner *po); 228 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length); 229 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup); 230 static void pmclog_schedule_all(struct pmc_owner *po); 231 static void pmclog_stop_kthread(struct pmc_owner *po); 232 233 /* 234 * Helper functions 235 */ 236 237 static inline void 238 pmc_plb_rele_unlocked(struct pmclog_buffer *plb) 239 { 240 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next); 241 } 242 243 static inline void 244 pmc_plb_rele(struct pmclog_buffer *plb) 245 { 246 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 247 pmc_plb_rele_unlocked(plb); 248 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 249 } 250 251 /* 252 * Get a log buffer 253 */ 254 static int 255 pmclog_get_buffer(struct pmc_owner *po) 256 { 257 struct pmclog_buffer *plb; 258 int domain; 259 260 KASSERT(po->po_curbuf[curcpu] == NULL, 261 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po)); 262 263 domain = curdomain; 264 MPASS(pmc_dom_hdrs[domain]); 265 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 266 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) 267 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 268 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 269 270 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb); 271 272 #ifdef HWPMC_DEBUG 273 if (plb) 274 KASSERT(plb->plb_ptr == plb->plb_base && 275 plb->plb_base < plb->plb_fence, 276 ("[pmclog,%d] po=%p buffer invariants: ptr=%p " 277 "base=%p fence=%p", __LINE__, po, plb->plb_ptr, 278 plb->plb_base, plb->plb_fence)); 279 #endif 280 281 po->po_curbuf[curcpu] = plb; 282 283 /* update stats */ 284 counter_u64_add(pmc_stats.pm_buffer_requests, 1); 285 if (plb == NULL) 286 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1); 287 288 return (plb ? 0 : ENOMEM); 289 } 290 291 struct pmclog_proc_init_args { 292 struct proc *kthr; 293 struct pmc_owner *po; 294 bool exit; 295 bool acted; 296 }; 297 298 int 299 pmclog_proc_create(struct thread *td, void **handlep) 300 { 301 struct pmclog_proc_init_args *ia; 302 int error; 303 304 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO); 305 error = kproc_create(pmclog_loop, ia, &ia->kthr, 306 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid); 307 if (error == 0) 308 *handlep = ia; 309 return (error); 310 } 311 312 void 313 pmclog_proc_ignite(void *handle, struct pmc_owner *po) 314 { 315 struct pmclog_proc_init_args *ia; 316 317 ia = handle; 318 mtx_lock(&pmc_kthread_mtx); 319 MPASS(!ia->acted); 320 MPASS(ia->po == NULL); 321 MPASS(!ia->exit); 322 MPASS(ia->kthr != NULL); 323 if (po == NULL) { 324 ia->exit = true; 325 } else { 326 ia->po = po; 327 KASSERT(po->po_kthread == NULL, 328 ("[pmclog,%d] po=%p kthread (%p) already present", 329 __LINE__, po, po->po_kthread)); 330 po->po_kthread = ia->kthr; 331 } 332 wakeup(ia); 333 while (!ia->acted) 334 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0); 335 mtx_unlock(&pmc_kthread_mtx); 336 free(ia, M_TEMP); 337 } 338 339 /* 340 * Log handler loop. 341 * 342 * This function is executed by each pmc owner's helper thread. 343 */ 344 static void 345 pmclog_loop(void *arg) 346 { 347 struct pmclog_proc_init_args *ia; 348 struct pmc_owner *po; 349 struct pmclog_buffer *lb; 350 struct proc *p; 351 struct ucred *ownercred; 352 struct ucred *mycred; 353 struct thread *td; 354 sigset_t unb; 355 struct uio auio; 356 struct iovec aiov; 357 size_t nbytes; 358 int error; 359 360 td = curthread; 361 362 SIGEMPTYSET(unb); 363 SIGADDSET(unb, SIGHUP); 364 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0); 365 366 ia = arg; 367 MPASS(ia->kthr == curproc); 368 MPASS(!ia->acted); 369 mtx_lock(&pmc_kthread_mtx); 370 while (ia->po == NULL && !ia->exit) 371 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0); 372 if (ia->exit) { 373 ia->acted = true; 374 wakeup(ia); 375 mtx_unlock(&pmc_kthread_mtx); 376 kproc_exit(0); 377 } 378 MPASS(ia->po != NULL); 379 po = ia->po; 380 ia->acted = true; 381 wakeup(ia); 382 mtx_unlock(&pmc_kthread_mtx); 383 ia = NULL; 384 385 p = po->po_owner; 386 mycred = td->td_ucred; 387 388 PROC_LOCK(p); 389 ownercred = crhold(p->p_ucred); 390 PROC_UNLOCK(p); 391 392 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread); 393 KASSERT(po->po_kthread == curthread->td_proc, 394 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__, 395 po, po->po_kthread, curthread->td_proc)); 396 397 lb = NULL; 398 399 400 /* 401 * Loop waiting for I/O requests to be added to the owner 402 * struct's queue. The loop is exited when the log file 403 * is deconfigured. 404 */ 405 406 mtx_lock(&pmc_kthread_mtx); 407 408 for (;;) { 409 410 /* check if we've been asked to exit */ 411 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 412 break; 413 414 if (lb == NULL) { /* look for a fresh buffer to write */ 415 mtx_lock_spin(&po->po_mtx); 416 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) { 417 mtx_unlock_spin(&po->po_mtx); 418 419 /* No more buffers and shutdown required. */ 420 if (po->po_flags & PMC_PO_SHUTDOWN) 421 break; 422 423 (void) msleep(po, &pmc_kthread_mtx, PWAIT, 424 "pmcloop", 250); 425 continue; 426 } 427 428 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 429 mtx_unlock_spin(&po->po_mtx); 430 } 431 432 mtx_unlock(&pmc_kthread_mtx); 433 434 /* process the request */ 435 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po, 436 lb->plb_base, lb->plb_ptr); 437 /* change our thread's credentials before issuing the I/O */ 438 439 aiov.iov_base = lb->plb_base; 440 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base; 441 442 auio.uio_iov = &aiov; 443 auio.uio_iovcnt = 1; 444 auio.uio_offset = -1; 445 auio.uio_resid = nbytes; 446 auio.uio_rw = UIO_WRITE; 447 auio.uio_segflg = UIO_SYSSPACE; 448 auio.uio_td = td; 449 450 /* switch thread credentials -- see kern_ktrace.c */ 451 td->td_ucred = ownercred; 452 error = fo_write(po->po_file, &auio, ownercred, 0, td); 453 td->td_ucred = mycred; 454 455 if (error) { 456 /* XXX some errors are recoverable */ 457 /* send a SIGIO to the owner and exit */ 458 PROC_LOCK(p); 459 kern_psignal(p, SIGIO); 460 PROC_UNLOCK(p); 461 462 mtx_lock(&pmc_kthread_mtx); 463 464 po->po_error = error; /* save for flush log */ 465 466 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error); 467 468 break; 469 } 470 471 mtx_lock(&pmc_kthread_mtx); 472 473 /* put the used buffer back into the global pool */ 474 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 475 476 pmc_plb_rele(lb); 477 lb = NULL; 478 } 479 480 wakeup_one(po->po_kthread); 481 po->po_kthread = NULL; 482 483 mtx_unlock(&pmc_kthread_mtx); 484 485 /* return the current I/O buffer to the global pool */ 486 if (lb) { 487 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 488 489 pmc_plb_rele(lb); 490 } 491 492 /* 493 * Exit this thread, signalling the waiter 494 */ 495 496 crfree(ownercred); 497 498 kproc_exit(0); 499 } 500 501 /* 502 * Release and log entry and schedule an I/O if needed. 503 */ 504 505 static void 506 pmclog_release_flags(struct pmc_owner *po, int wakeup) 507 { 508 struct pmclog_buffer *plb; 509 510 plb = po->po_curbuf[curcpu]; 511 KASSERT(plb->plb_ptr >= plb->plb_base, 512 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 513 po, plb->plb_ptr, plb->plb_base)); 514 KASSERT(plb->plb_ptr <= plb->plb_fence, 515 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 516 po, plb->plb_ptr, plb->plb_fence)); 517 518 /* schedule an I/O if we've filled a buffer */ 519 if (plb->plb_ptr >= plb->plb_fence) 520 pmclog_schedule_io(po, wakeup); 521 522 PMCDBG1(LOG,REL,1, "po=%p", po); 523 } 524 525 static void 526 pmclog_release(struct pmc_owner *po) 527 { 528 529 pmclog_release_flags(po, 1); 530 } 531 532 533 /* 534 * Attempt to reserve 'length' bytes of space in an owner's log 535 * buffer. The function returns a pointer to 'length' bytes of space 536 * if there was enough space or returns NULL if no space was 537 * available. Non-null returns do so with the po mutex locked. The 538 * caller must invoke pmclog_release() on the pmc owner structure 539 * when done. 540 */ 541 542 static uint32_t * 543 pmclog_reserve(struct pmc_owner *po, int length) 544 { 545 uintptr_t newptr, oldptr __diagused; 546 struct pmclog_buffer *plb, **pplb; 547 548 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length); 549 550 KASSERT(length % sizeof(uint32_t) == 0, 551 ("[pmclog,%d] length not a multiple of word size", __LINE__)); 552 553 /* No more data when shutdown in progress. */ 554 if (po->po_flags & PMC_PO_SHUTDOWN) 555 return (NULL); 556 557 pplb = &po->po_curbuf[curcpu]; 558 if (*pplb == NULL && pmclog_get_buffer(po) != 0) 559 goto fail; 560 561 KASSERT(*pplb != NULL, 562 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 563 564 plb = *pplb; 565 KASSERT(plb->plb_ptr >= plb->plb_base && 566 plb->plb_ptr <= plb->plb_fence, 567 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 568 __LINE__, po, plb->plb_ptr, plb->plb_base, 569 plb->plb_fence)); 570 571 oldptr = (uintptr_t) plb->plb_ptr; 572 newptr = oldptr + length; 573 574 KASSERT(oldptr != (uintptr_t) NULL, 575 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po)); 576 577 /* 578 * If we have space in the current buffer, return a pointer to 579 * available space with the PO structure locked. 580 */ 581 if (newptr <= (uintptr_t) plb->plb_fence) { 582 plb->plb_ptr = (char *) newptr; 583 goto done; 584 } 585 586 /* 587 * Otherwise, schedule the current buffer for output and get a 588 * fresh buffer. 589 */ 590 pmclog_schedule_io(po, 0); 591 592 if (pmclog_get_buffer(po) != 0) 593 goto fail; 594 595 plb = *pplb; 596 KASSERT(plb != NULL, 597 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 598 599 KASSERT(plb->plb_ptr != NULL, 600 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__)); 601 602 KASSERT(plb->plb_ptr == plb->plb_base && 603 plb->plb_ptr <= plb->plb_fence, 604 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 605 __LINE__, po, plb->plb_ptr, plb->plb_base, 606 plb->plb_fence)); 607 608 oldptr = (uintptr_t) plb->plb_ptr; 609 610 done: 611 return ((uint32_t *) oldptr); 612 fail: 613 return (NULL); 614 } 615 616 /* 617 * Schedule an I/O. 618 * 619 * Transfer the current buffer to the helper kthread. 620 */ 621 622 static void 623 pmclog_schedule_io(struct pmc_owner *po, int wakeup) 624 { 625 struct pmclog_buffer *plb; 626 627 plb = po->po_curbuf[curcpu]; 628 po->po_curbuf[curcpu] = NULL; 629 KASSERT(plb != NULL, 630 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po)); 631 KASSERT(plb->plb_ptr >= plb->plb_base, 632 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 633 po, plb->plb_ptr, plb->plb_base)); 634 KASSERT(plb->plb_ptr <= plb->plb_fence, 635 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 636 po, plb->plb_ptr, plb->plb_fence)); 637 638 PMCDBG1(LOG,SIO, 1, "po=%p", po); 639 640 /* 641 * Add the current buffer to the tail of the buffer list and 642 * wakeup the helper. 643 */ 644 mtx_lock_spin(&po->po_mtx); 645 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next); 646 mtx_unlock_spin(&po->po_mtx); 647 if (wakeup) 648 wakeup_one(po); 649 } 650 651 /* 652 * Stop the helper kthread. 653 */ 654 655 static void 656 pmclog_stop_kthread(struct pmc_owner *po) 657 { 658 659 mtx_lock(&pmc_kthread_mtx); 660 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 661 if (po->po_kthread != NULL) { 662 PROC_LOCK(po->po_kthread); 663 kern_psignal(po->po_kthread, SIGHUP); 664 PROC_UNLOCK(po->po_kthread); 665 } 666 wakeup_one(po); 667 while (po->po_kthread) 668 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0); 669 mtx_unlock(&pmc_kthread_mtx); 670 } 671 672 /* 673 * Public functions 674 */ 675 676 /* 677 * Configure a log file for pmc owner 'po'. 678 * 679 * Parameter 'logfd' is a file handle referencing an open file in the 680 * owner process. This file needs to have been opened for writing. 681 */ 682 683 int 684 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) 685 { 686 struct proc *p; 687 struct timespec ts; 688 int error; 689 690 sx_assert(&pmc_sx, SA_XLOCKED); 691 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); 692 693 p = po->po_owner; 694 695 /* return EBUSY if a log file was already present */ 696 if (po->po_flags & PMC_PO_OWNS_LOGFILE) 697 return (EBUSY); 698 699 KASSERT(po->po_file == NULL, 700 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, 701 po->po_file)); 702 703 /* get a reference to the file state */ 704 error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file); 705 if (error) 706 goto error; 707 708 /* mark process as owning a log file */ 709 po->po_flags |= PMC_PO_OWNS_LOGFILE; 710 711 /* mark process as using HWPMCs */ 712 PROC_LOCK(p); 713 p->p_flag |= P_HWPMC; 714 PROC_UNLOCK(p); 715 nanotime(&ts); 716 /* create a log initialization entry */ 717 PMCLOG_RESERVE_WITH_ERROR(po, PMCLOG_TYPE_INITIALIZE, 718 sizeof(struct pmclog_initialize)); 719 PMCLOG_EMIT32(PMC_VERSION); 720 PMCLOG_EMIT32(md->pmd_cputype); 721 #if defined(__i386__) || defined(__amd64__) 722 PMCLOG_EMIT64(tsc_freq); 723 #else 724 /* other architectures will need to fill this in */ 725 PMCLOG_EMIT32(0); 726 PMCLOG_EMIT32(0); 727 #endif 728 memcpy(_le, &ts, sizeof(ts)); 729 _le += sizeof(ts)/4; 730 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN); 731 PMCLOG_DESPATCH_SYNC(po); 732 733 return (0); 734 735 error: 736 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " 737 "stopped", __LINE__, po)); 738 739 if (po->po_file) 740 (void) fdrop(po->po_file, curthread); 741 po->po_file = NULL; /* clear file and error state */ 742 po->po_error = 0; 743 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 744 745 return (error); 746 } 747 748 749 /* 750 * De-configure a log file. This will throw away any buffers queued 751 * for this owner process. 752 */ 753 754 int 755 pmclog_deconfigure_log(struct pmc_owner *po) 756 { 757 int error; 758 struct pmclog_buffer *lb; 759 struct pmc_binding pb; 760 761 PMCDBG1(LOG,CFG,1, "de-config po=%p", po); 762 763 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 764 return (EINVAL); 765 766 KASSERT(po->po_sscount == 0, 767 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po)); 768 KASSERT(po->po_file != NULL, 769 ("[pmclog,%d] po=%p no log file", __LINE__, po)); 770 771 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */ 772 pmclog_stop_kthread(po); 773 774 KASSERT(po->po_kthread == NULL, 775 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po)); 776 777 /* return all queued log buffers to the global pool */ 778 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) { 779 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 780 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 781 pmc_plb_rele(lb); 782 } 783 pmc_save_cpu_binding(&pb); 784 for (int i = 0; i < mp_ncpus; i++) { 785 pmc_select_cpu(i); 786 /* return the 'current' buffer to the global pool */ 787 if ((lb = po->po_curbuf[curcpu]) != NULL) { 788 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 789 pmc_plb_rele(lb); 790 } 791 } 792 pmc_restore_cpu_binding(&pb); 793 794 /* drop a reference to the fd */ 795 if (po->po_file != NULL) { 796 error = fdrop(po->po_file, curthread); 797 po->po_file = NULL; 798 } else 799 error = 0; 800 po->po_error = 0; 801 802 return (error); 803 } 804 805 /* 806 * Flush a process' log buffer. 807 */ 808 809 int 810 pmclog_flush(struct pmc_owner *po, int force) 811 { 812 int error; 813 814 PMCDBG1(LOG,FLS,1, "po=%p", po); 815 816 /* 817 * If there is a pending error recorded by the logger thread, 818 * return that. 819 */ 820 if (po->po_error) 821 return (po->po_error); 822 823 error = 0; 824 825 /* 826 * Check that we do have an active log file. 827 */ 828 mtx_lock(&pmc_kthread_mtx); 829 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 830 error = EINVAL; 831 goto error; 832 } 833 834 pmclog_schedule_all(po); 835 error: 836 mtx_unlock(&pmc_kthread_mtx); 837 838 return (error); 839 } 840 841 static void 842 pmclog_schedule_one_cond(struct pmc_owner *po) 843 { 844 struct pmclog_buffer *plb; 845 int cpu; 846 847 spinlock_enter(); 848 cpu = curcpu; 849 /* tell hardclock not to run again */ 850 if (PMC_CPU_HAS_SAMPLES(cpu)) 851 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); 852 853 plb = po->po_curbuf[cpu]; 854 if (plb && plb->plb_ptr != plb->plb_base) 855 pmclog_schedule_io(po, 1); 856 spinlock_exit(); 857 } 858 859 static void 860 pmclog_schedule_all(struct pmc_owner *po) 861 { 862 struct pmc_binding pb; 863 864 /* 865 * Schedule the current buffer if any and not empty. 866 */ 867 pmc_save_cpu_binding(&pb); 868 for (int i = 0; i < mp_ncpus; i++) { 869 pmc_select_cpu(i); 870 pmclog_schedule_one_cond(po); 871 } 872 pmc_restore_cpu_binding(&pb); 873 } 874 875 int 876 pmclog_close(struct pmc_owner *po) 877 { 878 879 PMCDBG1(LOG,CLO,1, "po=%p", po); 880 881 pmclog_process_closelog(po); 882 883 mtx_lock(&pmc_kthread_mtx); 884 /* 885 * Initiate shutdown: no new data queued, 886 * thread will close file on last block. 887 */ 888 po->po_flags |= PMC_PO_SHUTDOWN; 889 /* give time for all to see */ 890 DELAY(50); 891 892 /* 893 * Schedule the current buffer. 894 */ 895 pmclog_schedule_all(po); 896 wakeup_one(po); 897 898 mtx_unlock(&pmc_kthread_mtx); 899 900 return (0); 901 } 902 903 void 904 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps) 905 { 906 int n, recordlen; 907 uint32_t flags; 908 struct pmc_owner *po; 909 910 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid, 911 ps->ps_nsamples); 912 913 recordlen = offsetof(struct pmclog_callchain, pl_pc) + 914 ps->ps_nsamples * sizeof(uintfptr_t); 915 po = pm->pm_owner; 916 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags); 917 PMCLOG_RESERVE_SAFE(po, PMCLOG_TYPE_CALLCHAIN, recordlen, ps->ps_tsc); 918 PMCLOG_EMIT32(ps->ps_pid); 919 PMCLOG_EMIT32(ps->ps_tid); 920 PMCLOG_EMIT32(pm->pm_id); 921 PMCLOG_EMIT32(flags); 922 for (n = 0; n < ps->ps_nsamples; n++) 923 PMCLOG_EMITADDR(ps->ps_pc[n]); 924 PMCLOG_DESPATCH_SAFE(po); 925 } 926 927 void 928 pmclog_process_closelog(struct pmc_owner *po) 929 { 930 PMCLOG_RESERVE(po, PMCLOG_TYPE_CLOSELOG, 931 sizeof(struct pmclog_closelog)); 932 PMCLOG_DESPATCH_SYNC(po); 933 } 934 935 void 936 pmclog_process_dropnotify(struct pmc_owner *po) 937 { 938 PMCLOG_RESERVE(po, PMCLOG_TYPE_DROPNOTIFY, 939 sizeof(struct pmclog_dropnotify)); 940 PMCLOG_DESPATCH(po); 941 } 942 943 void 944 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start, 945 const char *path) 946 { 947 int pathlen, recordlen; 948 949 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__)); 950 951 pathlen = strlen(path) + 1; /* #bytes for path name */ 952 recordlen = offsetof(struct pmclog_map_in, pl_pathname) + 953 pathlen; 954 955 PMCLOG_RESERVE(po, PMCLOG_TYPE_MAP_IN, recordlen); 956 PMCLOG_EMIT32(pid); 957 PMCLOG_EMIT32(0); 958 PMCLOG_EMITADDR(start); 959 PMCLOG_EMITSTRING(path,pathlen); 960 PMCLOG_DESPATCH_SYNC(po); 961 } 962 963 void 964 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start, 965 uintfptr_t end) 966 { 967 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__)); 968 969 PMCLOG_RESERVE(po, PMCLOG_TYPE_MAP_OUT, sizeof(struct pmclog_map_out)); 970 PMCLOG_EMIT32(pid); 971 PMCLOG_EMIT32(0); 972 PMCLOG_EMITADDR(start); 973 PMCLOG_EMITADDR(end); 974 PMCLOG_DESPATCH(po); 975 } 976 977 void 978 pmclog_process_pmcallocate(struct pmc *pm) 979 { 980 struct pmc_owner *po; 981 struct pmc_soft *ps; 982 983 po = pm->pm_owner; 984 985 PMCDBG1(LOG,ALL,1, "pm=%p", pm); 986 987 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { 988 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCALLOCATEDYN, 989 sizeof(struct pmclog_pmcallocatedyn)); 990 PMCLOG_EMIT32(pm->pm_id); 991 PMCLOG_EMIT32(pm->pm_event); 992 PMCLOG_EMIT32(pm->pm_flags); 993 PMCLOG_EMIT32(0); 994 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 995 ps = pmc_soft_ev_acquire(pm->pm_event); 996 if (ps != NULL) 997 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); 998 else 999 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); 1000 pmc_soft_ev_release(ps); 1001 PMCLOG_DESPATCH_SYNC(po); 1002 } else { 1003 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCALLOCATE, 1004 sizeof(struct pmclog_pmcallocate)); 1005 PMCLOG_EMIT32(pm->pm_id); 1006 PMCLOG_EMIT32(pm->pm_event); 1007 PMCLOG_EMIT32(pm->pm_flags); 1008 PMCLOG_EMIT32(0); 1009 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 1010 PMCLOG_DESPATCH_SYNC(po); 1011 } 1012 } 1013 1014 void 1015 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path) 1016 { 1017 int pathlen, recordlen; 1018 struct pmc_owner *po; 1019 1020 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid); 1021 1022 po = pm->pm_owner; 1023 1024 pathlen = strlen(path) + 1; /* #bytes for the string */ 1025 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen; 1026 1027 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCATTACH, recordlen); 1028 PMCLOG_EMIT32(pm->pm_id); 1029 PMCLOG_EMIT32(pid); 1030 PMCLOG_EMITSTRING(path, pathlen); 1031 PMCLOG_DESPATCH_SYNC(po); 1032 } 1033 1034 void 1035 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid) 1036 { 1037 struct pmc_owner *po; 1038 1039 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid); 1040 1041 po = pm->pm_owner; 1042 1043 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCDETACH, 1044 sizeof(struct pmclog_pmcdetach)); 1045 PMCLOG_EMIT32(pm->pm_id); 1046 PMCLOG_EMIT32(pid); 1047 PMCLOG_DESPATCH_SYNC(po); 1048 } 1049 1050 void 1051 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync) 1052 { 1053 if (sync) { 1054 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROC_CREATE, 1055 sizeof(struct pmclog_proccreate)); 1056 PMCLOG_EMIT32(p->p_pid); 1057 PMCLOG_EMIT32(p->p_flag); 1058 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1059 PMCLOG_DESPATCH_SYNC(po); 1060 } else { 1061 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROC_CREATE, 1062 sizeof(struct pmclog_proccreate)); 1063 PMCLOG_EMIT32(p->p_pid); 1064 PMCLOG_EMIT32(p->p_flag); 1065 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1066 PMCLOG_DESPATCH(po); 1067 } 1068 } 1069 1070 /* 1071 * Log a context switch event to the log file. 1072 */ 1073 1074 void 1075 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td) 1076 { 1077 struct pmc_owner *po; 1078 1079 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW, 1080 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__)); 1081 1082 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1083 v); 1084 1085 po = pm->pm_owner; 1086 1087 PMCLOG_RESERVE_SAFE(po, PMCLOG_TYPE_PROCCSW, 1088 sizeof(struct pmclog_proccsw), pmc_rdtsc()); 1089 PMCLOG_EMIT64(v); 1090 PMCLOG_EMIT32(pm->pm_id); 1091 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1092 PMCLOG_EMIT32(td->td_tid); 1093 PMCLOG_EMIT32(0); 1094 PMCLOG_DESPATCH_SCHED_LOCK(po); 1095 } 1096 1097 void 1098 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid, 1099 uintptr_t baseaddr, uintptr_t dynaddr, char *path) 1100 { 1101 int pathlen, recordlen; 1102 1103 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path); 1104 1105 pathlen = strlen(path) + 1; /* #bytes for the path */ 1106 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen; 1107 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCEXEC, recordlen); 1108 PMCLOG_EMIT32(pid); 1109 PMCLOG_EMIT32(pmid); 1110 PMCLOG_EMITADDR(baseaddr); 1111 PMCLOG_EMITADDR(dynaddr); 1112 PMCLOG_EMITSTRING(path,pathlen); 1113 PMCLOG_DESPATCH_SYNC(po); 1114 } 1115 1116 /* 1117 * Log a process exit event (and accumulated pmc value) to the log file. 1118 */ 1119 1120 void 1121 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp) 1122 { 1123 int ri; 1124 struct pmc_owner *po; 1125 1126 ri = PMC_TO_ROWINDEX(pm); 1127 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1128 pp->pp_pmcs[ri].pp_pmcval); 1129 1130 po = pm->pm_owner; 1131 1132 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCEXIT, 1133 sizeof(struct pmclog_procexit)); 1134 PMCLOG_EMIT32(pm->pm_id); 1135 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1136 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval); 1137 PMCLOG_DESPATCH(po); 1138 } 1139 1140 /* 1141 * Log a fork event. 1142 */ 1143 1144 void 1145 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid) 1146 { 1147 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCFORK, 1148 sizeof(struct pmclog_procfork)); 1149 PMCLOG_EMIT32(oldpid); 1150 PMCLOG_EMIT32(newpid); 1151 PMCLOG_DESPATCH(po); 1152 } 1153 1154 /* 1155 * Log a process exit event of the form suitable for system-wide PMCs. 1156 */ 1157 1158 void 1159 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid) 1160 { 1161 PMCLOG_RESERVE(po, PMCLOG_TYPE_SYSEXIT, sizeof(struct pmclog_sysexit)); 1162 PMCLOG_EMIT32(pid); 1163 PMCLOG_DESPATCH(po); 1164 } 1165 1166 void 1167 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync) 1168 { 1169 struct proc *p; 1170 1171 p = td->td_proc; 1172 if (sync) { 1173 PMCLOG_RESERVE(po, PMCLOG_TYPE_THR_CREATE, 1174 sizeof(struct pmclog_threadcreate)); 1175 PMCLOG_EMIT32(td->td_tid); 1176 PMCLOG_EMIT32(p->p_pid); 1177 PMCLOG_EMIT32(p->p_flag); 1178 PMCLOG_EMIT32(0); 1179 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1180 PMCLOG_DESPATCH_SYNC(po); 1181 } else { 1182 PMCLOG_RESERVE(po, PMCLOG_TYPE_THR_CREATE, 1183 sizeof(struct pmclog_threadcreate)); 1184 PMCLOG_EMIT32(td->td_tid); 1185 PMCLOG_EMIT32(p->p_pid); 1186 PMCLOG_EMIT32(p->p_flag); 1187 PMCLOG_EMIT32(0); 1188 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1189 PMCLOG_DESPATCH(po); 1190 } 1191 } 1192 1193 void 1194 pmclog_process_threadexit(struct pmc_owner *po, struct thread *td) 1195 { 1196 1197 PMCLOG_RESERVE(po, PMCLOG_TYPE_THR_EXIT, 1198 sizeof(struct pmclog_threadexit)); 1199 PMCLOG_EMIT32(td->td_tid); 1200 PMCLOG_DESPATCH(po); 1201 } 1202 1203 /* 1204 * Write a user log entry. 1205 */ 1206 1207 int 1208 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) 1209 { 1210 int error; 1211 1212 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); 1213 1214 error = 0; 1215 1216 PMCLOG_RESERVE_WITH_ERROR(po, PMCLOG_TYPE_USERDATA, 1217 sizeof(struct pmclog_userdata)); 1218 PMCLOG_EMIT32(wl->pm_userdata); 1219 PMCLOG_DESPATCH(po); 1220 1221 error: 1222 return (error); 1223 } 1224 1225 /* 1226 * Initialization. 1227 * 1228 * Create a pool of log buffers and initialize mutexes. 1229 */ 1230 1231 void 1232 pmclog_initialize(void) 1233 { 1234 struct pmclog_buffer *plb; 1235 int domain, ncpus, total; 1236 1237 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) { 1238 (void) printf("hwpmc: tunable logbuffersize=%d must be " 1239 "greater than zero and less than or equal to 16MB.\n", 1240 pmclog_buffer_size); 1241 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1242 } 1243 1244 if (pmc_nlogbuffers_pcpu <= 0) { 1245 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater " 1246 "than zero.\n", pmc_nlogbuffers_pcpu); 1247 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1248 } 1249 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) { 1250 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n", 1251 pmc_nlogbuffers_pcpu*pmclog_buffer_size); 1252 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1253 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1254 } 1255 for (domain = 0; domain < vm_ndomains; domain++) { 1256 ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus; 1257 total = ncpus * pmc_nlogbuffers_pcpu; 1258 1259 plb = malloc_domainset(sizeof(struct pmclog_buffer) * total, 1260 M_PMC, DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); 1261 pmc_dom_hdrs[domain]->pdbh_plbs = plb; 1262 for (; total > 0; total--, plb++) { 1263 void *buf; 1264 1265 buf = malloc_domainset(1024 * pmclog_buffer_size, M_PMC, 1266 DOMAINSET_PREF(domain), 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(void) 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