1147191Sjkoshy/*- 2174395Sjkoshy * Copyright (c) 2005-2007 Joseph Koshy 3174395Sjkoshy * Copyright (c) 2007 The FreeBSD Foundation 4147191Sjkoshy * All rights reserved. 5147191Sjkoshy * 6174395Sjkoshy * Portions of this software were developed by A. Joseph Koshy under 7174395Sjkoshy * sponsorship from the FreeBSD Foundation and Google, Inc. 8174395Sjkoshy * 9147191Sjkoshy * Redistribution and use in source and binary forms, with or without 10147191Sjkoshy * modification, are permitted provided that the following conditions 11147191Sjkoshy * are met: 12147191Sjkoshy * 1. Redistributions of source code must retain the above copyright 13147191Sjkoshy * notice, this list of conditions and the following disclaimer. 14147191Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 15147191Sjkoshy * notice, this list of conditions and the following disclaimer in the 16147191Sjkoshy * documentation and/or other materials provided with the distribution. 17147191Sjkoshy * 18147191Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19147191Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20147191Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21147191Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22147191Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23147191Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24147191Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25147191Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26147191Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27147191Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28147191Sjkoshy * SUCH DAMAGE. 29147191Sjkoshy * 30147191Sjkoshy */ 31147191Sjkoshy 32147191Sjkoshy/* 33147191Sjkoshy * Logging code for hwpmc(4) 34147191Sjkoshy */ 35147191Sjkoshy 36147191Sjkoshy#include <sys/cdefs.h> 37147191Sjkoshy__FBSDID("$FreeBSD$"); 38147191Sjkoshy 39147191Sjkoshy#include <sys/param.h> 40280455Srrs#if (__FreeBSD_version >= 1100000) 41280258Srwatson#include <sys/capsicum.h> 42280455Srrs#else 43280455Srrs#include <sys/capability.h> 44280455Srrs#endif 45147191Sjkoshy#include <sys/file.h> 46147191Sjkoshy#include <sys/kernel.h> 47147191Sjkoshy#include <sys/kthread.h> 48147191Sjkoshy#include <sys/lock.h> 49147191Sjkoshy#include <sys/module.h> 50147191Sjkoshy#include <sys/mutex.h> 51147191Sjkoshy#include <sys/pmc.h> 52195005Sattilio#include <sys/pmckern.h> 53147191Sjkoshy#include <sys/pmclog.h> 54147191Sjkoshy#include <sys/proc.h> 55147191Sjkoshy#include <sys/signalvar.h> 56147191Sjkoshy#include <sys/sysctl.h> 57147191Sjkoshy#include <sys/systm.h> 58147191Sjkoshy#include <sys/uio.h> 59147191Sjkoshy#include <sys/unistd.h> 60147191Sjkoshy#include <sys/vnode.h> 61147191Sjkoshy 62147191Sjkoshy/* 63147191Sjkoshy * Sysctl tunables 64147191Sjkoshy */ 65147191Sjkoshy 66147191SjkoshySYSCTL_DECL(_kern_hwpmc); 67147191Sjkoshy 68147191Sjkoshy/* 69147191Sjkoshy * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers. 70147191Sjkoshy */ 71147191Sjkoshy 72147191Sjkoshystatic int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 73280455SrrsSYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN, 74147191Sjkoshy &pmclog_buffer_size, 0, "size of log buffers in kilobytes"); 75147191Sjkoshy 76147191Sjkoshy/* 77147191Sjkoshy * kern.hwpmc.nbuffer -- number of global log buffers 78147191Sjkoshy */ 79147191Sjkoshy 80147191Sjkoshystatic int pmc_nlogbuffers = PMC_NLOGBUFFERS; 81280455SrrsSYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers, CTLFLAG_RDTUN, 82147191Sjkoshy &pmc_nlogbuffers, 0, "number of global log buffers"); 83147191Sjkoshy 84147191Sjkoshy/* 85147191Sjkoshy * Global log buffer list and associated spin lock. 86147191Sjkoshy */ 87147191Sjkoshy 88147191SjkoshyTAILQ_HEAD(, pmclog_buffer) pmc_bufferlist = 89147191Sjkoshy TAILQ_HEAD_INITIALIZER(pmc_bufferlist); 90147191Sjkoshystatic struct mtx pmc_bufferlist_mtx; /* spin lock */ 91147191Sjkoshystatic struct mtx pmc_kthread_mtx; /* sleep lock */ 92147191Sjkoshy 93147191Sjkoshy#define PMCLOG_INIT_BUFFER_DESCRIPTOR(D) do { \ 94147191Sjkoshy const int __roundup = roundup(sizeof(*D), \ 95147191Sjkoshy sizeof(uint32_t)); \ 96147191Sjkoshy (D)->plb_fence = ((char *) (D)) + \ 97147191Sjkoshy 1024*pmclog_buffer_size; \ 98147191Sjkoshy (D)->plb_base = (D)->plb_ptr = ((char *) (D)) + \ 99147191Sjkoshy __roundup; \ 100147191Sjkoshy } while (0) 101147191Sjkoshy 102147191Sjkoshy 103147191Sjkoshy/* 104147191Sjkoshy * Log file record constructors. 105147191Sjkoshy */ 106147867Sjkoshy#define _PMCLOG_TO_HEADER(T,L) \ 107147867Sjkoshy ((PMCLOG_HEADER_MAGIC << 24) | \ 108147867Sjkoshy (PMCLOG_TYPE_ ## T << 16) | \ 109147867Sjkoshy ((L) & 0xFFFF)) 110147867Sjkoshy 111147191Sjkoshy/* reserve LEN bytes of space and initialize the entry header */ 112147191Sjkoshy#define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \ 113147191Sjkoshy uint32_t *_le; \ 114147191Sjkoshy int _len = roundup((LEN), sizeof(uint32_t)); \ 115147191Sjkoshy if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 116147191Sjkoshy ACTION; \ 117147191Sjkoshy } \ 118147867Sjkoshy *_le = _PMCLOG_TO_HEADER(TYPE,_len); \ 119147191Sjkoshy _le += 3 /* skip over timestamp */ 120147191Sjkoshy 121147191Sjkoshy#define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return) 122147191Sjkoshy#define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \ 123147191Sjkoshy error=ENOMEM;goto error) 124147191Sjkoshy 125147191Sjkoshy#define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0) 126147191Sjkoshy#define PMCLOG_EMIT64(V) do { \ 127147191Sjkoshy *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \ 128147191Sjkoshy *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \ 129147191Sjkoshy } while (0) 130147191Sjkoshy 131147191Sjkoshy 132147191Sjkoshy/* Emit a string. Caution: does NOT update _le, so needs to be last */ 133147191Sjkoshy#define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) 134233628Sfabient#define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) 135147191Sjkoshy 136147191Sjkoshy#define PMCLOG_DESPATCH(PO) \ 137147191Sjkoshy pmclog_release((PO)); \ 138147191Sjkoshy } while (0) 139147191Sjkoshy 140147191Sjkoshy 141147191Sjkoshy/* 142147191Sjkoshy * Assertions about the log file format. 143147191Sjkoshy */ 144147191Sjkoshy 145174395SjkoshyCTASSERT(sizeof(struct pmclog_callchain) == 6*4 + 146174395Sjkoshy PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t)); 147147191SjkoshyCTASSERT(sizeof(struct pmclog_closelog) == 3*4); 148147191SjkoshyCTASSERT(sizeof(struct pmclog_dropnotify) == 3*4); 149157144SjkoshyCTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + 150157144Sjkoshy 4*4 + sizeof(uintfptr_t)); 151157144SjkoshyCTASSERT(offsetof(struct pmclog_map_in,pl_pathname) == 152157144Sjkoshy 4*4 + sizeof(uintfptr_t)); 153157144SjkoshyCTASSERT(sizeof(struct pmclog_map_out) == 4*4 + 2*sizeof(uintfptr_t)); 154147708SjkoshyCTASSERT(sizeof(struct pmclog_pcsample) == 6*4 + sizeof(uintfptr_t)); 155147191SjkoshyCTASSERT(sizeof(struct pmclog_pmcallocate) == 6*4); 156147191SjkoshyCTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX); 157147191SjkoshyCTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4); 158147191SjkoshyCTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4); 159147191SjkoshyCTASSERT(sizeof(struct pmclog_proccsw) == 5*4 + 8); 160147708SjkoshyCTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX + 161147708Sjkoshy sizeof(uintfptr_t)); 162147708SjkoshyCTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + 163147708Sjkoshy sizeof(uintfptr_t)); 164147191SjkoshyCTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8); 165147191SjkoshyCTASSERT(sizeof(struct pmclog_procfork) == 5*4); 166147191SjkoshyCTASSERT(sizeof(struct pmclog_sysexit) == 4*4); 167147191SjkoshyCTASSERT(sizeof(struct pmclog_userdata) == 4*4); 168147191Sjkoshy 169147191Sjkoshy/* 170147191Sjkoshy * Log buffer structure 171147191Sjkoshy */ 172147191Sjkoshy 173147191Sjkoshystruct pmclog_buffer { 174147191Sjkoshy TAILQ_ENTRY(pmclog_buffer) plb_next; 175147191Sjkoshy char *plb_base; 176147191Sjkoshy char *plb_ptr; 177147191Sjkoshy char *plb_fence; 178147191Sjkoshy}; 179147191Sjkoshy 180147191Sjkoshy/* 181147191Sjkoshy * Prototypes 182147191Sjkoshy */ 183147191Sjkoshy 184147191Sjkoshystatic int pmclog_get_buffer(struct pmc_owner *po); 185147191Sjkoshystatic void pmclog_loop(void *arg); 186147191Sjkoshystatic void pmclog_release(struct pmc_owner *po); 187147191Sjkoshystatic uint32_t *pmclog_reserve(struct pmc_owner *po, int length); 188147191Sjkoshystatic void pmclog_schedule_io(struct pmc_owner *po); 189147191Sjkoshystatic void pmclog_stop_kthread(struct pmc_owner *po); 190147191Sjkoshy 191147191Sjkoshy/* 192147191Sjkoshy * Helper functions 193147191Sjkoshy */ 194147191Sjkoshy 195147191Sjkoshy/* 196147191Sjkoshy * Get a log buffer 197147191Sjkoshy */ 198147191Sjkoshy 199147191Sjkoshystatic int 200147191Sjkoshypmclog_get_buffer(struct pmc_owner *po) 201147191Sjkoshy{ 202147191Sjkoshy struct pmclog_buffer *plb; 203147191Sjkoshy 204147191Sjkoshy mtx_assert(&po->po_mtx, MA_OWNED); 205147191Sjkoshy 206147191Sjkoshy KASSERT(po->po_curbuf == NULL, 207186127Sjkoshy ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po)); 208147191Sjkoshy 209147191Sjkoshy mtx_lock_spin(&pmc_bufferlist_mtx); 210147191Sjkoshy if ((plb = TAILQ_FIRST(&pmc_bufferlist)) != NULL) 211147191Sjkoshy TAILQ_REMOVE(&pmc_bufferlist, plb, plb_next); 212147191Sjkoshy mtx_unlock_spin(&pmc_bufferlist_mtx); 213147191Sjkoshy 214283884Sjhb PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb); 215147191Sjkoshy 216283884Sjhb#ifdef HWPMC_DEBUG 217147191Sjkoshy if (plb) 218147191Sjkoshy KASSERT(plb->plb_ptr == plb->plb_base && 219147191Sjkoshy plb->plb_base < plb->plb_fence, 220186127Sjkoshy ("[pmclog,%d] po=%p buffer invariants: ptr=%p " 221147191Sjkoshy "base=%p fence=%p", __LINE__, po, plb->plb_ptr, 222147191Sjkoshy plb->plb_base, plb->plb_fence)); 223147191Sjkoshy#endif 224147191Sjkoshy 225147191Sjkoshy po->po_curbuf = plb; 226147191Sjkoshy 227147191Sjkoshy /* update stats */ 228147191Sjkoshy atomic_add_int(&pmc_stats.pm_buffer_requests, 1); 229147191Sjkoshy if (plb == NULL) 230147191Sjkoshy atomic_add_int(&pmc_stats.pm_buffer_requests_failed, 1); 231147191Sjkoshy 232186127Sjkoshy return (plb ? 0 : ENOMEM); 233147191Sjkoshy} 234147191Sjkoshy 235147191Sjkoshy/* 236147191Sjkoshy * Log handler loop. 237147191Sjkoshy * 238147191Sjkoshy * This function is executed by each pmc owner's helper thread. 239147191Sjkoshy */ 240147191Sjkoshy 241147191Sjkoshystatic void 242147191Sjkoshypmclog_loop(void *arg) 243147191Sjkoshy{ 244226514Sfabient int error; 245147191Sjkoshy struct pmc_owner *po; 246147191Sjkoshy struct pmclog_buffer *lb; 247199763Sfabient struct proc *p; 248147191Sjkoshy struct ucred *ownercred; 249147191Sjkoshy struct ucred *mycred; 250147191Sjkoshy struct thread *td; 251147191Sjkoshy struct uio auio; 252147191Sjkoshy struct iovec aiov; 253147191Sjkoshy size_t nbytes; 254147191Sjkoshy 255147191Sjkoshy po = (struct pmc_owner *) arg; 256199763Sfabient p = po->po_owner; 257147191Sjkoshy td = curthread; 258147191Sjkoshy mycred = td->td_ucred; 259147191Sjkoshy 260199763Sfabient PROC_LOCK(p); 261199763Sfabient ownercred = crhold(p->p_ucred); 262199763Sfabient PROC_UNLOCK(p); 263147191Sjkoshy 264283884Sjhb PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread); 265147191Sjkoshy KASSERT(po->po_kthread == curthread->td_proc, 266186127Sjkoshy ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__, 267147191Sjkoshy po, po->po_kthread, curthread->td_proc)); 268147191Sjkoshy 269147191Sjkoshy lb = NULL; 270147191Sjkoshy 271147191Sjkoshy 272147191Sjkoshy /* 273147191Sjkoshy * Loop waiting for I/O requests to be added to the owner 274147191Sjkoshy * struct's queue. The loop is exited when the log file 275147191Sjkoshy * is deconfigured. 276147191Sjkoshy */ 277147191Sjkoshy 278147191Sjkoshy mtx_lock(&pmc_kthread_mtx); 279147191Sjkoshy 280147191Sjkoshy for (;;) { 281147191Sjkoshy 282147191Sjkoshy /* check if we've been asked to exit */ 283147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 284147191Sjkoshy break; 285147191Sjkoshy 286147191Sjkoshy if (lb == NULL) { /* look for a fresh buffer to write */ 287147191Sjkoshy mtx_lock_spin(&po->po_mtx); 288147191Sjkoshy if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) { 289147191Sjkoshy mtx_unlock_spin(&po->po_mtx); 290147191Sjkoshy 291233544Sfabient /* No more buffers and shutdown required. */ 292226514Sfabient if (po->po_flags & PMC_PO_SHUTDOWN) { 293226514Sfabient mtx_unlock(&pmc_kthread_mtx); 294226514Sfabient /* 295226514Sfabient * Close the file to get PMCLOG_EOF 296226514Sfabient * error in pmclog(3). 297226514Sfabient */ 298226514Sfabient fo_close(po->po_file, curthread); 299226514Sfabient mtx_lock(&pmc_kthread_mtx); 300233544Sfabient break; 301226514Sfabient } 302226514Sfabient 303185465Sjkoshy (void) msleep(po, &pmc_kthread_mtx, PWAIT, 304185465Sjkoshy "pmcloop", 0); 305147191Sjkoshy continue; 306147191Sjkoshy } 307147191Sjkoshy 308147191Sjkoshy TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 309147191Sjkoshy mtx_unlock_spin(&po->po_mtx); 310147191Sjkoshy } 311147191Sjkoshy 312147191Sjkoshy mtx_unlock(&pmc_kthread_mtx); 313147191Sjkoshy 314147191Sjkoshy /* process the request */ 315283884Sjhb PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po, 316147191Sjkoshy lb->plb_base, lb->plb_ptr); 317147191Sjkoshy /* change our thread's credentials before issuing the I/O */ 318147191Sjkoshy 319147191Sjkoshy aiov.iov_base = lb->plb_base; 320147191Sjkoshy aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base; 321147191Sjkoshy 322147191Sjkoshy auio.uio_iov = &aiov; 323147191Sjkoshy auio.uio_iovcnt = 1; 324147191Sjkoshy auio.uio_offset = -1; 325147191Sjkoshy auio.uio_resid = nbytes; 326147191Sjkoshy auio.uio_rw = UIO_WRITE; 327147191Sjkoshy auio.uio_segflg = UIO_SYSSPACE; 328147191Sjkoshy auio.uio_td = td; 329147191Sjkoshy 330147191Sjkoshy /* switch thread credentials -- see kern_ktrace.c */ 331147191Sjkoshy td->td_ucred = ownercred; 332147191Sjkoshy error = fo_write(po->po_file, &auio, ownercred, 0, td); 333147191Sjkoshy td->td_ucred = mycred; 334147191Sjkoshy 335147191Sjkoshy if (error) { 336147191Sjkoshy /* XXX some errors are recoverable */ 337147191Sjkoshy /* send a SIGIO to the owner and exit */ 338199763Sfabient PROC_LOCK(p); 339225617Skmacy kern_psignal(p, SIGIO); 340199763Sfabient PROC_UNLOCK(p); 341147191Sjkoshy 342199763Sfabient mtx_lock(&pmc_kthread_mtx); 343199763Sfabient 344147191Sjkoshy po->po_error = error; /* save for flush log */ 345147191Sjkoshy 346283884Sjhb PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error); 347147191Sjkoshy 348147191Sjkoshy break; 349147191Sjkoshy } 350147191Sjkoshy 351199763Sfabient mtx_lock(&pmc_kthread_mtx); 352199763Sfabient 353147191Sjkoshy /* put the used buffer back into the global pool */ 354147191Sjkoshy PMCLOG_INIT_BUFFER_DESCRIPTOR(lb); 355147191Sjkoshy 356147191Sjkoshy mtx_lock_spin(&pmc_bufferlist_mtx); 357147191Sjkoshy TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next); 358147191Sjkoshy mtx_unlock_spin(&pmc_bufferlist_mtx); 359147191Sjkoshy 360147191Sjkoshy lb = NULL; 361147191Sjkoshy } 362147191Sjkoshy 363233544Sfabient wakeup_one(po->po_kthread); 364147191Sjkoshy po->po_kthread = NULL; 365147191Sjkoshy 366147191Sjkoshy mtx_unlock(&pmc_kthread_mtx); 367147191Sjkoshy 368147191Sjkoshy /* return the current I/O buffer to the global pool */ 369147191Sjkoshy if (lb) { 370147191Sjkoshy PMCLOG_INIT_BUFFER_DESCRIPTOR(lb); 371147191Sjkoshy 372147191Sjkoshy mtx_lock_spin(&pmc_bufferlist_mtx); 373147191Sjkoshy TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next); 374147191Sjkoshy mtx_unlock_spin(&pmc_bufferlist_mtx); 375147191Sjkoshy } 376147191Sjkoshy 377147191Sjkoshy /* 378147191Sjkoshy * Exit this thread, signalling the waiter 379147191Sjkoshy */ 380147191Sjkoshy 381147191Sjkoshy crfree(ownercred); 382147191Sjkoshy 383172836Sjulian kproc_exit(0); 384147191Sjkoshy} 385147191Sjkoshy 386147191Sjkoshy/* 387147191Sjkoshy * Release and log entry and schedule an I/O if needed. 388147191Sjkoshy */ 389147191Sjkoshy 390147191Sjkoshystatic void 391147191Sjkoshypmclog_release(struct pmc_owner *po) 392147191Sjkoshy{ 393147191Sjkoshy KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base, 394186127Sjkoshy ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 395147191Sjkoshy po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base)); 396147191Sjkoshy KASSERT(po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence, 397186127Sjkoshy ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 398147191Sjkoshy po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_fence)); 399147191Sjkoshy 400147191Sjkoshy /* schedule an I/O if we've filled a buffer */ 401147191Sjkoshy if (po->po_curbuf->plb_ptr >= po->po_curbuf->plb_fence) 402147191Sjkoshy pmclog_schedule_io(po); 403147191Sjkoshy 404147191Sjkoshy mtx_unlock_spin(&po->po_mtx); 405147191Sjkoshy 406283884Sjhb PMCDBG1(LOG,REL,1, "po=%p", po); 407147191Sjkoshy} 408147191Sjkoshy 409147191Sjkoshy 410147191Sjkoshy/* 411147191Sjkoshy * Attempt to reserve 'length' bytes of space in an owner's log 412147191Sjkoshy * buffer. The function returns a pointer to 'length' bytes of space 413147191Sjkoshy * if there was enough space or returns NULL if no space was 414147191Sjkoshy * available. Non-null returns do so with the po mutex locked. The 415147191Sjkoshy * caller must invoke pmclog_release() on the pmc owner structure 416147191Sjkoshy * when done. 417147191Sjkoshy */ 418147191Sjkoshy 419147191Sjkoshystatic uint32_t * 420147191Sjkoshypmclog_reserve(struct pmc_owner *po, int length) 421147191Sjkoshy{ 422147867Sjkoshy uintptr_t newptr, oldptr; 423147191Sjkoshy uint32_t *lh; 424147191Sjkoshy struct timespec ts; 425147191Sjkoshy 426283884Sjhb PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length); 427147191Sjkoshy 428147191Sjkoshy KASSERT(length % sizeof(uint32_t) == 0, 429147191Sjkoshy ("[pmclog,%d] length not a multiple of word size", __LINE__)); 430147191Sjkoshy 431147191Sjkoshy mtx_lock_spin(&po->po_mtx); 432147191Sjkoshy 433204878Sfabient /* No more data when shutdown in progress. */ 434204878Sfabient if (po->po_flags & PMC_PO_SHUTDOWN) { 435204878Sfabient mtx_unlock_spin(&po->po_mtx); 436204878Sfabient return (NULL); 437204878Sfabient } 438204878Sfabient 439147191Sjkoshy if (po->po_curbuf == NULL) 440147191Sjkoshy if (pmclog_get_buffer(po) != 0) { 441147191Sjkoshy mtx_unlock_spin(&po->po_mtx); 442186127Sjkoshy return (NULL); 443147191Sjkoshy } 444147191Sjkoshy 445147191Sjkoshy KASSERT(po->po_curbuf != NULL, 446186127Sjkoshy ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 447147191Sjkoshy 448147191Sjkoshy KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base && 449147191Sjkoshy po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence, 450186127Sjkoshy ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 451147191Sjkoshy __LINE__, po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base, 452147191Sjkoshy po->po_curbuf->plb_fence)); 453147191Sjkoshy 454147867Sjkoshy oldptr = (uintptr_t) po->po_curbuf->plb_ptr; 455147191Sjkoshy newptr = oldptr + length; 456147191Sjkoshy 457147867Sjkoshy KASSERT(oldptr != (uintptr_t) NULL, 458186127Sjkoshy ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po)); 459147191Sjkoshy 460147191Sjkoshy /* 461147191Sjkoshy * If we have space in the current buffer, return a pointer to 462147191Sjkoshy * available space with the PO structure locked. 463147191Sjkoshy */ 464147867Sjkoshy if (newptr <= (uintptr_t) po->po_curbuf->plb_fence) { 465147867Sjkoshy po->po_curbuf->plb_ptr = (char *) newptr; 466147191Sjkoshy goto done; 467147191Sjkoshy } 468147191Sjkoshy 469147867Sjkoshy /* 470147867Sjkoshy * Otherwise, schedule the current buffer for output and get a 471147867Sjkoshy * fresh buffer. 472147867Sjkoshy */ 473147191Sjkoshy pmclog_schedule_io(po); 474147191Sjkoshy 475147191Sjkoshy if (pmclog_get_buffer(po) != 0) { 476147191Sjkoshy mtx_unlock_spin(&po->po_mtx); 477186127Sjkoshy return (NULL); 478147191Sjkoshy } 479147191Sjkoshy 480147191Sjkoshy KASSERT(po->po_curbuf != NULL, 481186127Sjkoshy ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 482147191Sjkoshy 483147191Sjkoshy KASSERT(po->po_curbuf->plb_ptr != NULL, 484186127Sjkoshy ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__)); 485147191Sjkoshy 486147191Sjkoshy KASSERT(po->po_curbuf->plb_ptr == po->po_curbuf->plb_base && 487147191Sjkoshy po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence, 488186127Sjkoshy ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 489147191Sjkoshy __LINE__, po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base, 490147191Sjkoshy po->po_curbuf->plb_fence)); 491147191Sjkoshy 492147867Sjkoshy oldptr = (uintptr_t) po->po_curbuf->plb_ptr; 493147191Sjkoshy 494147191Sjkoshy done: 495147867Sjkoshy lh = (uint32_t *) oldptr; 496147867Sjkoshy lh++; /* skip header */ 497147867Sjkoshy getnanotime(&ts); /* fill in the timestamp */ 498147191Sjkoshy *lh++ = ts.tv_sec & 0xFFFFFFFF; 499147191Sjkoshy *lh++ = ts.tv_nsec & 0xFFFFFFF; 500186127Sjkoshy return ((uint32_t *) oldptr); 501147191Sjkoshy} 502147191Sjkoshy 503147191Sjkoshy/* 504147191Sjkoshy * Schedule an I/O. 505147191Sjkoshy * 506147191Sjkoshy * Transfer the current buffer to the helper kthread. 507147191Sjkoshy */ 508147191Sjkoshy 509147191Sjkoshystatic void 510147191Sjkoshypmclog_schedule_io(struct pmc_owner *po) 511147191Sjkoshy{ 512147191Sjkoshy KASSERT(po->po_curbuf != NULL, 513186127Sjkoshy ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po)); 514147191Sjkoshy 515147191Sjkoshy KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base, 516186127Sjkoshy ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 517147191Sjkoshy po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base)); 518147191Sjkoshy KASSERT(po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence, 519186127Sjkoshy ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 520147191Sjkoshy po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_fence)); 521147191Sjkoshy 522283884Sjhb PMCDBG1(LOG,SIO, 1, "po=%p", po); 523147191Sjkoshy 524147191Sjkoshy mtx_assert(&po->po_mtx, MA_OWNED); 525147191Sjkoshy 526147191Sjkoshy /* 527147191Sjkoshy * Add the current buffer to the tail of the buffer list and 528147191Sjkoshy * wakeup the helper. 529147191Sjkoshy */ 530147191Sjkoshy TAILQ_INSERT_TAIL(&po->po_logbuffers, po->po_curbuf, plb_next); 531147191Sjkoshy po->po_curbuf = NULL; 532147191Sjkoshy wakeup_one(po); 533147191Sjkoshy} 534147191Sjkoshy 535147191Sjkoshy/* 536147191Sjkoshy * Stop the helper kthread. 537147191Sjkoshy */ 538147191Sjkoshy 539147191Sjkoshystatic void 540147191Sjkoshypmclog_stop_kthread(struct pmc_owner *po) 541147191Sjkoshy{ 542147191Sjkoshy /* 543199763Sfabient * Close the file to force the thread out of fo_write, 544199763Sfabient * unset flag, wakeup the helper thread, 545147191Sjkoshy * wait for it to exit 546147191Sjkoshy */ 547147191Sjkoshy 548199763Sfabient if (po->po_file != NULL) 549199763Sfabient fo_close(po->po_file, curthread); 550199763Sfabient 551199763Sfabient mtx_lock(&pmc_kthread_mtx); 552147191Sjkoshy po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 553147191Sjkoshy wakeup_one(po); 554147191Sjkoshy if (po->po_kthread) 555147867Sjkoshy msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0); 556199763Sfabient mtx_unlock(&pmc_kthread_mtx); 557147191Sjkoshy} 558147191Sjkoshy 559147191Sjkoshy/* 560147191Sjkoshy * Public functions 561147191Sjkoshy */ 562147191Sjkoshy 563147191Sjkoshy/* 564147191Sjkoshy * Configure a log file for pmc owner 'po'. 565147191Sjkoshy * 566147191Sjkoshy * Parameter 'logfd' is a file handle referencing an open file in the 567147191Sjkoshy * owner process. This file needs to have been opened for writing. 568147191Sjkoshy */ 569147191Sjkoshy 570147191Sjkoshyint 571185363Sjkoshypmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) 572147191Sjkoshy{ 573147191Sjkoshy int error; 574147191Sjkoshy struct proc *p; 575255219Spjd cap_rights_t rights; 576195005Sattilio /* 577195005Sattilio * As long as it is possible to get a LOR between pmc_sx lock and 578195005Sattilio * proctree/allproc sx locks used for adding a new process, assure 579195005Sattilio * the former is not held here. 580195005Sattilio */ 581195005Sattilio sx_assert(&pmc_sx, SA_UNLOCKED); 582283884Sjhb PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); 583147191Sjkoshy 584147191Sjkoshy p = po->po_owner; 585147191Sjkoshy 586147191Sjkoshy /* return EBUSY if a log file was already present */ 587147191Sjkoshy if (po->po_flags & PMC_PO_OWNS_LOGFILE) 588186127Sjkoshy return (EBUSY); 589147191Sjkoshy 590147191Sjkoshy KASSERT(po->po_kthread == NULL, 591186127Sjkoshy ("[pmclog,%d] po=%p kthread (%p) already present", __LINE__, po, 592147191Sjkoshy po->po_kthread)); 593147191Sjkoshy KASSERT(po->po_file == NULL, 594186127Sjkoshy ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, 595147191Sjkoshy po->po_file)); 596147191Sjkoshy 597147191Sjkoshy /* get a reference to the file state */ 598255219Spjd error = fget_write(curthread, logfd, 599255219Spjd cap_rights_init(&rights, CAP_WRITE), &po->po_file); 600147191Sjkoshy if (error) 601147191Sjkoshy goto error; 602147191Sjkoshy 603147191Sjkoshy /* mark process as owning a log file */ 604147191Sjkoshy po->po_flags |= PMC_PO_OWNS_LOGFILE; 605172836Sjulian error = kproc_create(pmclog_loop, po, &po->po_kthread, 606147191Sjkoshy RFHIGHPID, 0, "hwpmc: proc(%d)", p->p_pid); 607147191Sjkoshy if (error) 608147191Sjkoshy goto error; 609147191Sjkoshy 610147191Sjkoshy /* mark process as using HWPMCs */ 611147191Sjkoshy PROC_LOCK(p); 612147191Sjkoshy p->p_flag |= P_HWPMC; 613147191Sjkoshy PROC_UNLOCK(p); 614147191Sjkoshy 615147191Sjkoshy /* create a log initialization entry */ 616147191Sjkoshy PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE, 617147191Sjkoshy sizeof(struct pmclog_initialize)); 618147191Sjkoshy PMCLOG_EMIT32(PMC_VERSION); 619147191Sjkoshy PMCLOG_EMIT32(md->pmd_cputype); 620147191Sjkoshy PMCLOG_DESPATCH(po); 621147191Sjkoshy 622186127Sjkoshy return (0); 623147191Sjkoshy 624147191Sjkoshy error: 625147191Sjkoshy /* shutdown the thread */ 626147191Sjkoshy if (po->po_kthread) 627147191Sjkoshy pmclog_stop_kthread(po); 628147191Sjkoshy 629186127Sjkoshy KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " 630186127Sjkoshy "stopped", __LINE__, po)); 631147191Sjkoshy 632147191Sjkoshy if (po->po_file) 633147191Sjkoshy (void) fdrop(po->po_file, curthread); 634147191Sjkoshy po->po_file = NULL; /* clear file and error state */ 635147191Sjkoshy po->po_error = 0; 636147191Sjkoshy 637186127Sjkoshy return (error); 638147191Sjkoshy} 639147191Sjkoshy 640147191Sjkoshy 641147191Sjkoshy/* 642147191Sjkoshy * De-configure a log file. This will throw away any buffers queued 643147191Sjkoshy * for this owner process. 644147191Sjkoshy */ 645147191Sjkoshy 646147191Sjkoshyint 647147191Sjkoshypmclog_deconfigure_log(struct pmc_owner *po) 648147191Sjkoshy{ 649147191Sjkoshy int error; 650147191Sjkoshy struct pmclog_buffer *lb; 651147191Sjkoshy 652283884Sjhb PMCDBG1(LOG,CFG,1, "de-config po=%p", po); 653147191Sjkoshy 654147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 655186127Sjkoshy return (EINVAL); 656147191Sjkoshy 657156466Sjkoshy KASSERT(po->po_sscount == 0, 658186127Sjkoshy ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po)); 659147191Sjkoshy KASSERT(po->po_file != NULL, 660186127Sjkoshy ("[pmclog,%d] po=%p no log file", __LINE__, po)); 661147191Sjkoshy 662147191Sjkoshy /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */ 663233544Sfabient pmclog_stop_kthread(po); 664147191Sjkoshy 665147191Sjkoshy KASSERT(po->po_kthread == NULL, 666186127Sjkoshy ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po)); 667147191Sjkoshy 668147191Sjkoshy /* return all queued log buffers to the global pool */ 669147191Sjkoshy while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) { 670147191Sjkoshy TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 671147191Sjkoshy PMCLOG_INIT_BUFFER_DESCRIPTOR(lb); 672147191Sjkoshy mtx_lock_spin(&pmc_bufferlist_mtx); 673147191Sjkoshy TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next); 674147191Sjkoshy mtx_unlock_spin(&pmc_bufferlist_mtx); 675147191Sjkoshy } 676147191Sjkoshy 677147191Sjkoshy /* return the 'current' buffer to the global pool */ 678147191Sjkoshy if ((lb = po->po_curbuf) != NULL) { 679147191Sjkoshy PMCLOG_INIT_BUFFER_DESCRIPTOR(lb); 680147191Sjkoshy mtx_lock_spin(&pmc_bufferlist_mtx); 681147191Sjkoshy TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next); 682147191Sjkoshy mtx_unlock_spin(&pmc_bufferlist_mtx); 683147191Sjkoshy } 684147191Sjkoshy 685147191Sjkoshy /* drop a reference to the fd */ 686147191Sjkoshy error = fdrop(po->po_file, curthread); 687147191Sjkoshy po->po_file = NULL; 688147191Sjkoshy po->po_error = 0; 689147191Sjkoshy 690186127Sjkoshy return (error); 691147191Sjkoshy} 692147191Sjkoshy 693147191Sjkoshy/* 694147191Sjkoshy * Flush a process' log buffer. 695147191Sjkoshy */ 696147191Sjkoshy 697147191Sjkoshyint 698147191Sjkoshypmclog_flush(struct pmc_owner *po) 699147191Sjkoshy{ 700204878Sfabient int error; 701226514Sfabient struct pmclog_buffer *lb; 702147191Sjkoshy 703283884Sjhb PMCDBG1(LOG,FLS,1, "po=%p", po); 704147191Sjkoshy 705147191Sjkoshy /* 706147191Sjkoshy * If there is a pending error recorded by the logger thread, 707147191Sjkoshy * return that. 708147191Sjkoshy */ 709147191Sjkoshy if (po->po_error) 710186127Sjkoshy return (po->po_error); 711147191Sjkoshy 712147191Sjkoshy error = 0; 713147191Sjkoshy 714147191Sjkoshy /* 715147191Sjkoshy * Check that we do have an active log file. 716147191Sjkoshy */ 717147191Sjkoshy mtx_lock(&pmc_kthread_mtx); 718147191Sjkoshy if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 719147191Sjkoshy error = EINVAL; 720147191Sjkoshy goto error; 721147191Sjkoshy } 722147191Sjkoshy 723147191Sjkoshy /* 724226514Sfabient * Schedule the current buffer if any and not empty. 725147191Sjkoshy */ 726147191Sjkoshy mtx_lock_spin(&po->po_mtx); 727226514Sfabient lb = po->po_curbuf; 728226514Sfabient if (lb && lb->plb_ptr != lb->plb_base) { 729226514Sfabient pmclog_schedule_io(po); 730226514Sfabient } else 731226514Sfabient error = ENOBUFS; 732226514Sfabient mtx_unlock_spin(&po->po_mtx); 733226514Sfabient 734226514Sfabient error: 735226514Sfabient mtx_unlock(&pmc_kthread_mtx); 736226514Sfabient 737226514Sfabient return (error); 738226514Sfabient} 739226514Sfabient 740226514Sfabientint 741226514Sfabientpmclog_close(struct pmc_owner *po) 742226514Sfabient{ 743226514Sfabient 744283884Sjhb PMCDBG1(LOG,CLO,1, "po=%p", po); 745226514Sfabient 746226514Sfabient mtx_lock(&pmc_kthread_mtx); 747226514Sfabient 748226514Sfabient /* 749226514Sfabient * Schedule the current buffer. 750226514Sfabient */ 751226514Sfabient mtx_lock_spin(&po->po_mtx); 752147191Sjkoshy if (po->po_curbuf) 753147191Sjkoshy pmclog_schedule_io(po); 754226514Sfabient else 755226514Sfabient wakeup_one(po); 756147191Sjkoshy mtx_unlock_spin(&po->po_mtx); 757147191Sjkoshy 758204878Sfabient /* 759204878Sfabient * Initiate shutdown: no new data queued, 760204878Sfabient * thread will close file on last block. 761204878Sfabient */ 762204878Sfabient po->po_flags |= PMC_PO_SHUTDOWN; 763147191Sjkoshy 764147191Sjkoshy mtx_unlock(&pmc_kthread_mtx); 765147191Sjkoshy 766226514Sfabient return (0); 767147191Sjkoshy} 768147191Sjkoshy 769174395Sjkoshyvoid 770174395Sjkoshypmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps) 771174395Sjkoshy{ 772174395Sjkoshy int n, recordlen; 773174395Sjkoshy uint32_t flags; 774174395Sjkoshy struct pmc_owner *po; 775147191Sjkoshy 776283884Sjhb PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid, 777174395Sjkoshy ps->ps_nsamples); 778174395Sjkoshy 779174395Sjkoshy recordlen = offsetof(struct pmclog_callchain, pl_pc) + 780174395Sjkoshy ps->ps_nsamples * sizeof(uintfptr_t); 781174395Sjkoshy po = pm->pm_owner; 782174395Sjkoshy flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags); 783174395Sjkoshy PMCLOG_RESERVE(po, CALLCHAIN, recordlen); 784174395Sjkoshy PMCLOG_EMIT32(ps->ps_pid); 785174395Sjkoshy PMCLOG_EMIT32(pm->pm_id); 786174395Sjkoshy PMCLOG_EMIT32(flags); 787174395Sjkoshy for (n = 0; n < ps->ps_nsamples; n++) 788174395Sjkoshy PMCLOG_EMITADDR(ps->ps_pc[n]); 789174395Sjkoshy PMCLOG_DESPATCH(po); 790174395Sjkoshy} 791174395Sjkoshy 792147191Sjkoshyvoid 793147191Sjkoshypmclog_process_closelog(struct pmc_owner *po) 794147191Sjkoshy{ 795147191Sjkoshy PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog)); 796147191Sjkoshy PMCLOG_DESPATCH(po); 797147191Sjkoshy} 798147191Sjkoshy 799147191Sjkoshyvoid 800147191Sjkoshypmclog_process_dropnotify(struct pmc_owner *po) 801147191Sjkoshy{ 802147191Sjkoshy PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify)); 803147191Sjkoshy PMCLOG_DESPATCH(po); 804147191Sjkoshy} 805147191Sjkoshy 806147191Sjkoshyvoid 807157144Sjkoshypmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start, 808157144Sjkoshy const char *path) 809147191Sjkoshy{ 810147191Sjkoshy int pathlen, recordlen; 811147191Sjkoshy 812157144Sjkoshy KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__)); 813157144Sjkoshy 814147191Sjkoshy pathlen = strlen(path) + 1; /* #bytes for path name */ 815157144Sjkoshy recordlen = offsetof(struct pmclog_map_in, pl_pathname) + 816147191Sjkoshy pathlen; 817147191Sjkoshy 818157144Sjkoshy PMCLOG_RESERVE(po, MAP_IN, recordlen); 819157144Sjkoshy PMCLOG_EMIT32(pid); 820147191Sjkoshy PMCLOG_EMITADDR(start); 821147191Sjkoshy PMCLOG_EMITSTRING(path,pathlen); 822147191Sjkoshy PMCLOG_DESPATCH(po); 823147191Sjkoshy} 824147191Sjkoshy 825157144Sjkoshyvoid 826157144Sjkoshypmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start, 827157144Sjkoshy uintfptr_t end) 828157144Sjkoshy{ 829157144Sjkoshy KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__)); 830147191Sjkoshy 831157144Sjkoshy PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out)); 832157144Sjkoshy PMCLOG_EMIT32(pid); 833157144Sjkoshy PMCLOG_EMITADDR(start); 834157144Sjkoshy PMCLOG_EMITADDR(end); 835157144Sjkoshy PMCLOG_DESPATCH(po); 836157144Sjkoshy} 837157144Sjkoshy 838147191Sjkoshyvoid 839147191Sjkoshypmclog_process_pmcallocate(struct pmc *pm) 840147191Sjkoshy{ 841147191Sjkoshy struct pmc_owner *po; 842233628Sfabient struct pmc_soft *ps; 843147191Sjkoshy 844147191Sjkoshy po = pm->pm_owner; 845147191Sjkoshy 846283884Sjhb PMCDBG1(LOG,ALL,1, "pm=%p", pm); 847147191Sjkoshy 848233628Sfabient if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { 849233628Sfabient PMCLOG_RESERVE(po, PMCALLOCATEDYN, 850233628Sfabient sizeof(struct pmclog_pmcallocatedyn)); 851233628Sfabient PMCLOG_EMIT32(pm->pm_id); 852233628Sfabient PMCLOG_EMIT32(pm->pm_event); 853233628Sfabient PMCLOG_EMIT32(pm->pm_flags); 854233628Sfabient ps = pmc_soft_ev_acquire(pm->pm_event); 855233628Sfabient if (ps != NULL) 856233628Sfabient PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); 857233628Sfabient else 858233628Sfabient PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); 859233628Sfabient pmc_soft_ev_release(ps); 860233628Sfabient PMCLOG_DESPATCH(po); 861233628Sfabient } else { 862233628Sfabient PMCLOG_RESERVE(po, PMCALLOCATE, 863233628Sfabient sizeof(struct pmclog_pmcallocate)); 864233628Sfabient PMCLOG_EMIT32(pm->pm_id); 865233628Sfabient PMCLOG_EMIT32(pm->pm_event); 866233628Sfabient PMCLOG_EMIT32(pm->pm_flags); 867233628Sfabient PMCLOG_DESPATCH(po); 868233628Sfabient } 869147191Sjkoshy} 870147191Sjkoshy 871147191Sjkoshyvoid 872147191Sjkoshypmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path) 873147191Sjkoshy{ 874147191Sjkoshy int pathlen, recordlen; 875147191Sjkoshy struct pmc_owner *po; 876147191Sjkoshy 877283884Sjhb PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid); 878147191Sjkoshy 879147191Sjkoshy po = pm->pm_owner; 880147191Sjkoshy 881147191Sjkoshy pathlen = strlen(path) + 1; /* #bytes for the string */ 882147191Sjkoshy recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen; 883147191Sjkoshy 884147191Sjkoshy PMCLOG_RESERVE(po, PMCATTACH, recordlen); 885147191Sjkoshy PMCLOG_EMIT32(pm->pm_id); 886147191Sjkoshy PMCLOG_EMIT32(pid); 887147191Sjkoshy PMCLOG_EMITSTRING(path, pathlen); 888147191Sjkoshy PMCLOG_DESPATCH(po); 889147191Sjkoshy} 890147191Sjkoshy 891147191Sjkoshyvoid 892147191Sjkoshypmclog_process_pmcdetach(struct pmc *pm, pid_t pid) 893147191Sjkoshy{ 894147191Sjkoshy struct pmc_owner *po; 895147191Sjkoshy 896283884Sjhb PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid); 897147191Sjkoshy 898147191Sjkoshy po = pm->pm_owner; 899147191Sjkoshy 900147191Sjkoshy PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach)); 901147191Sjkoshy PMCLOG_EMIT32(pm->pm_id); 902147191Sjkoshy PMCLOG_EMIT32(pid); 903147191Sjkoshy PMCLOG_DESPATCH(po); 904147191Sjkoshy} 905147191Sjkoshy 906147191Sjkoshy/* 907147191Sjkoshy * Log a context switch event to the log file. 908147191Sjkoshy */ 909147191Sjkoshy 910147191Sjkoshyvoid 911147191Sjkoshypmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v) 912147191Sjkoshy{ 913147191Sjkoshy struct pmc_owner *po; 914147191Sjkoshy 915147191Sjkoshy KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW, 916147191Sjkoshy ("[pmclog,%d] log-process-csw called gratuitously", __LINE__)); 917147191Sjkoshy 918283884Sjhb PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 919147191Sjkoshy v); 920147191Sjkoshy 921147191Sjkoshy po = pm->pm_owner; 922147191Sjkoshy 923147191Sjkoshy PMCLOG_RESERVE(po, PROCCSW, sizeof(struct pmclog_proccsw)); 924147191Sjkoshy PMCLOG_EMIT32(pm->pm_id); 925147191Sjkoshy PMCLOG_EMIT64(v); 926147191Sjkoshy PMCLOG_EMIT32(pp->pp_proc->p_pid); 927147191Sjkoshy PMCLOG_DESPATCH(po); 928147191Sjkoshy} 929147191Sjkoshy 930147191Sjkoshyvoid 931147708Sjkoshypmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid, 932147708Sjkoshy uintfptr_t startaddr, char *path) 933147191Sjkoshy{ 934147191Sjkoshy int pathlen, recordlen; 935147191Sjkoshy 936283884Sjhb PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path); 937147191Sjkoshy 938147191Sjkoshy pathlen = strlen(path) + 1; /* #bytes for the path */ 939147191Sjkoshy recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen; 940147191Sjkoshy 941147191Sjkoshy PMCLOG_RESERVE(po, PROCEXEC, recordlen); 942147191Sjkoshy PMCLOG_EMIT32(pid); 943147708Sjkoshy PMCLOG_EMITADDR(startaddr); 944147708Sjkoshy PMCLOG_EMIT32(pmid); 945147191Sjkoshy PMCLOG_EMITSTRING(path,pathlen); 946147191Sjkoshy PMCLOG_DESPATCH(po); 947147191Sjkoshy} 948147191Sjkoshy 949147191Sjkoshy/* 950147191Sjkoshy * Log a process exit event (and accumulated pmc value) to the log file. 951147191Sjkoshy */ 952147191Sjkoshy 953147191Sjkoshyvoid 954147191Sjkoshypmclog_process_procexit(struct pmc *pm, struct pmc_process *pp) 955147191Sjkoshy{ 956147191Sjkoshy int ri; 957147191Sjkoshy struct pmc_owner *po; 958147191Sjkoshy 959147191Sjkoshy ri = PMC_TO_ROWINDEX(pm); 960283884Sjhb PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 961147191Sjkoshy pp->pp_pmcs[ri].pp_pmcval); 962147191Sjkoshy 963147191Sjkoshy po = pm->pm_owner; 964147191Sjkoshy 965147191Sjkoshy PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit)); 966147191Sjkoshy PMCLOG_EMIT32(pm->pm_id); 967147191Sjkoshy PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval); 968147191Sjkoshy PMCLOG_EMIT32(pp->pp_proc->p_pid); 969147191Sjkoshy PMCLOG_DESPATCH(po); 970147191Sjkoshy} 971147191Sjkoshy 972147191Sjkoshy/* 973147191Sjkoshy * Log a fork event. 974147191Sjkoshy */ 975147191Sjkoshy 976147191Sjkoshyvoid 977147191Sjkoshypmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid) 978147191Sjkoshy{ 979147191Sjkoshy PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork)); 980147191Sjkoshy PMCLOG_EMIT32(oldpid); 981147191Sjkoshy PMCLOG_EMIT32(newpid); 982147191Sjkoshy PMCLOG_DESPATCH(po); 983147191Sjkoshy} 984147191Sjkoshy 985147191Sjkoshy/* 986147191Sjkoshy * Log a process exit event of the form suitable for system-wide PMCs. 987147191Sjkoshy */ 988147191Sjkoshy 989147191Sjkoshyvoid 990147191Sjkoshypmclog_process_sysexit(struct pmc_owner *po, pid_t pid) 991147191Sjkoshy{ 992147191Sjkoshy PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit)); 993147191Sjkoshy PMCLOG_EMIT32(pid); 994147191Sjkoshy PMCLOG_DESPATCH(po); 995147191Sjkoshy} 996147191Sjkoshy 997147191Sjkoshy/* 998147191Sjkoshy * Write a user log entry. 999147191Sjkoshy */ 1000147191Sjkoshy 1001147191Sjkoshyint 1002147191Sjkoshypmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) 1003147191Sjkoshy{ 1004147191Sjkoshy int error; 1005147191Sjkoshy 1006283884Sjhb PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); 1007147191Sjkoshy 1008147191Sjkoshy error = 0; 1009147191Sjkoshy 1010147191Sjkoshy PMCLOG_RESERVE_WITH_ERROR(po, USERDATA, 1011147191Sjkoshy sizeof(struct pmclog_userdata)); 1012147191Sjkoshy PMCLOG_EMIT32(wl->pm_userdata); 1013147191Sjkoshy PMCLOG_DESPATCH(po); 1014147191Sjkoshy 1015147191Sjkoshy error: 1016186127Sjkoshy return (error); 1017147191Sjkoshy} 1018147191Sjkoshy 1019147191Sjkoshy/* 1020147191Sjkoshy * Initialization. 1021147191Sjkoshy * 1022147191Sjkoshy * Create a pool of log buffers and initialize mutexes. 1023147191Sjkoshy */ 1024147191Sjkoshy 1025147191Sjkoshyvoid 1026147191Sjkoshypmclog_initialize() 1027147191Sjkoshy{ 1028147191Sjkoshy int n; 1029147191Sjkoshy struct pmclog_buffer *plb; 1030147191Sjkoshy 1031147191Sjkoshy if (pmclog_buffer_size <= 0) { 1032186127Sjkoshy (void) printf("hwpmc: tunable logbuffersize=%d must be " 1033186127Sjkoshy "greater than zero.\n", pmclog_buffer_size); 1034147191Sjkoshy pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1035147191Sjkoshy } 1036147191Sjkoshy 1037147191Sjkoshy if (pmc_nlogbuffers <= 0) { 1038147191Sjkoshy (void) printf("hwpmc: tunable nlogbuffers=%d must be greater " 1039147191Sjkoshy "than zero.\n", pmc_nlogbuffers); 1040147191Sjkoshy pmc_nlogbuffers = PMC_NLOGBUFFERS; 1041147191Sjkoshy } 1042147191Sjkoshy 1043147191Sjkoshy /* create global pool of log buffers */ 1044147191Sjkoshy for (n = 0; n < pmc_nlogbuffers; n++) { 1045184801Sjkoshy plb = malloc(1024 * pmclog_buffer_size, M_PMC, 1046184801Sjkoshy M_WAITOK|M_ZERO); 1047147191Sjkoshy PMCLOG_INIT_BUFFER_DESCRIPTOR(plb); 1048147191Sjkoshy TAILQ_INSERT_HEAD(&pmc_bufferlist, plb, plb_next); 1049147191Sjkoshy } 1050168856Sjkoshy mtx_init(&pmc_bufferlist_mtx, "pmc-buffer-list", "pmc-leaf", 1051168856Sjkoshy MTX_SPIN); 1052168856Sjkoshy mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF); 1053147191Sjkoshy} 1054147191Sjkoshy 1055147191Sjkoshy/* 1056147191Sjkoshy * Shutdown logging. 1057147191Sjkoshy * 1058147191Sjkoshy * Destroy mutexes and release memory back the to free pool. 1059147191Sjkoshy */ 1060147191Sjkoshy 1061147191Sjkoshyvoid 1062147191Sjkoshypmclog_shutdown() 1063147191Sjkoshy{ 1064147191Sjkoshy struct pmclog_buffer *plb; 1065147191Sjkoshy 1066147191Sjkoshy mtx_destroy(&pmc_kthread_mtx); 1067147191Sjkoshy mtx_destroy(&pmc_bufferlist_mtx); 1068147191Sjkoshy 1069147191Sjkoshy while ((plb = TAILQ_FIRST(&pmc_bufferlist)) != NULL) { 1070147191Sjkoshy TAILQ_REMOVE(&pmc_bufferlist, plb, plb_next); 1071184205Sdes free(plb, M_PMC); 1072147191Sjkoshy } 1073147191Sjkoshy} 1074