/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2005-2007 Joseph Koshy * Copyright (c) 2007 The FreeBSD Foundation * Copyright (c) 2018 Matthew Macy * All rights reserved. * * Portions of this software were developed by A. Joseph Koshy under * sponsorship from the FreeBSD Foundation and Google, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * */ /* * Logging code for hwpmc(4) */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(__i386__) || defined(__amd64__) #include #endif #define curdomain PCPU_GET(domain) /* * Sysctl tunables */ SYSCTL_DECL(_kern_hwpmc); /* * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers. */ static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; #if (__FreeBSD_version < 1100000) TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size); #endif SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN, &pmclog_buffer_size, 0, "size of log buffers in kilobytes"); /* * kern.hwpmc.nbuffers_pcpu -- number of global log buffers */ static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; #if (__FreeBSD_version < 1100000) TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers_pcpu); #endif SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN, &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu"); /* * Global log buffer list and associated spin lock. */ static struct mtx pmc_kthread_mtx; /* sleep lock */ #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \ (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \ (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \ (D)->plb_domain = domain; \ } while (0) #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \ (D)->plb_ptr = (D)->plb_base; \ } while (0) /* * Log file record constructors. */ #define _PMCLOG_TO_HEADER(T,L) \ ((PMCLOG_HEADER_MAGIC << 24) | \ (PMCLOG_TYPE_ ## T << 16) | \ ((L) & 0xFFFF)) /* reserve LEN bytes of space and initialize the entry header */ #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION, TSC) do { \ uint32_t *_le; \ int _len = roundup((LEN), sizeof(uint32_t)); \ struct pmclog_header *ph; \ if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ ACTION; \ } \ ph = (struct pmclog_header *)_le; \ ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ ph->pl_tsc = (TSC); \ _le += sizeof(*ph)/4 /* skip over timestamp */ /* reserve LEN bytes of space and initialize the entry header */ #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \ uint32_t *_le; \ int _len = roundup((LEN), sizeof(uint32_t)); \ uint64_t tsc; \ struct pmclog_header *ph; \ tsc = pmc_rdtsc(); \ spinlock_enter(); \ if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ spinlock_exit(); \ ACTION; \ } \ ph = (struct pmclog_header *)_le; \ ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ ph->pl_tsc = tsc; \ _le += sizeof(*ph)/4 /* skip over timestamp */ #define PMCLOG_RESERVE_SAFE(P,T,L,TSC) _PMCLOG_RESERVE_SAFE(P,T,L,return,TSC) #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return) #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \ error=ENOMEM;goto error) #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0) #define PMCLOG_EMIT64(V) do { \ *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \ *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \ } while (0) /* Emit a string. Caution: does NOT update _le, so needs to be last */ #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) #define PMCLOG_DESPATCH_SAFE(PO) \ pmclog_release((PO)); \ } while (0) #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \ pmclog_release_flags((PO), 0); \ } while (0) #define PMCLOG_DESPATCH(PO) \ pmclog_release((PO)); \ spinlock_exit(); \ } while (0) #define PMCLOG_DESPATCH_SYNC(PO) \ pmclog_schedule_io((PO), 1); \ spinlock_exit(); \ } while (0) #define TSDELTA 4 /* * Assertions about the log file format. */ CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA + PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t)); CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA); CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA); CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA + 5*4 + sizeof(uintfptr_t)); CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) == 5*4 + TSDELTA + sizeof(uintfptr_t)); CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA); CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA); CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA); CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA); CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA); CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA); CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX + sizeof(uintfptr_t) + TSDELTA); CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA + sizeof(uintfptr_t)); CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA); CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA); CTASSERT(sizeof(struct pmclog_sysexit) == 6*4); CTASSERT(sizeof(struct pmclog_userdata) == 6*4); /* * Log buffer structure */ struct pmclog_buffer { TAILQ_ENTRY(pmclog_buffer) plb_next; char *plb_base; char *plb_ptr; char *plb_fence; uint16_t plb_domain; } __aligned(CACHE_LINE_SIZE); /* * Prototypes */ static int pmclog_get_buffer(struct pmc_owner *po); static void pmclog_loop(void *arg); static void pmclog_release(struct pmc_owner *po); static uint32_t *pmclog_reserve(struct pmc_owner *po, int length); static void pmclog_schedule_io(struct pmc_owner *po, int wakeup); static void pmclog_schedule_all(struct pmc_owner *po); static void pmclog_stop_kthread(struct pmc_owner *po); /* * Helper functions */ static inline void pmc_plb_rele_unlocked(struct pmclog_buffer *plb) { TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next); } static inline void pmc_plb_rele(struct pmclog_buffer *plb) { mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); pmc_plb_rele_unlocked(plb); mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); } /* * Get a log buffer */ static int pmclog_get_buffer(struct pmc_owner *po) { struct pmclog_buffer *plb; int domain; KASSERT(po->po_curbuf[curcpu] == NULL, ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po)); domain = curdomain; MPASS(pmc_dom_hdrs[domain]); mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb); #ifdef HWPMC_DEBUG if (plb) KASSERT(plb->plb_ptr == plb->plb_base && plb->plb_base < plb->plb_fence, ("[pmclog,%d] po=%p buffer invariants: ptr=%p " "base=%p fence=%p", __LINE__, po, plb->plb_ptr, plb->plb_base, plb->plb_fence)); #endif po->po_curbuf[curcpu] = plb; /* update stats */ counter_u64_add(pmc_stats.pm_buffer_requests, 1); if (plb == NULL) counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1); return (plb ? 0 : ENOMEM); } struct pmclog_proc_init_args { struct proc *kthr; struct pmc_owner *po; bool exit; bool acted; }; int pmclog_proc_create(struct thread *td, void **handlep) { struct pmclog_proc_init_args *ia; int error; ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO); error = kproc_create(pmclog_loop, ia, &ia->kthr, RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid); if (error == 0) *handlep = ia; return (error); } void pmclog_proc_ignite(void *handle, struct pmc_owner *po) { struct pmclog_proc_init_args *ia; ia = handle; mtx_lock(&pmc_kthread_mtx); MPASS(!ia->acted); MPASS(ia->po == NULL); MPASS(!ia->exit); MPASS(ia->kthr != NULL); if (po == NULL) { ia->exit = true; } else { ia->po = po; KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread (%p) already present", __LINE__, po, po->po_kthread)); po->po_kthread = ia->kthr; } wakeup(ia); while (!ia->acted) msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0); mtx_unlock(&pmc_kthread_mtx); free(ia, M_TEMP); } /* * Log handler loop. * * This function is executed by each pmc owner's helper thread. */ static void pmclog_loop(void *arg) { struct pmclog_proc_init_args *ia; struct pmc_owner *po; struct pmclog_buffer *lb; struct proc *p; struct ucred *ownercred; struct ucred *mycred; struct thread *td; sigset_t unb; struct uio auio; struct iovec aiov; size_t nbytes; int error; td = curthread; SIGEMPTYSET(unb); SIGADDSET(unb, SIGHUP); (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0); ia = arg; MPASS(ia->kthr == curproc); MPASS(!ia->acted); mtx_lock(&pmc_kthread_mtx); while (ia->po == NULL && !ia->exit) msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0); if (ia->exit) { ia->acted = true; wakeup(ia); mtx_unlock(&pmc_kthread_mtx); kproc_exit(0); } MPASS(ia->po != NULL); po = ia->po; ia->acted = true; wakeup(ia); mtx_unlock(&pmc_kthread_mtx); ia = NULL; p = po->po_owner; mycred = td->td_ucred; PROC_LOCK(p); ownercred = crhold(p->p_ucred); PROC_UNLOCK(p); PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread); KASSERT(po->po_kthread == curthread->td_proc, ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__, po, po->po_kthread, curthread->td_proc)); lb = NULL; /* * Loop waiting for I/O requests to be added to the owner * struct's queue. The loop is exited when the log file * is deconfigured. */ mtx_lock(&pmc_kthread_mtx); for (;;) { /* check if we've been asked to exit */ if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) break; if (lb == NULL) { /* look for a fresh buffer to write */ mtx_lock_spin(&po->po_mtx); if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) { mtx_unlock_spin(&po->po_mtx); /* No more buffers and shutdown required. */ if (po->po_flags & PMC_PO_SHUTDOWN) break; (void) msleep(po, &pmc_kthread_mtx, PWAIT, "pmcloop", 250); continue; } TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); mtx_unlock_spin(&po->po_mtx); } mtx_unlock(&pmc_kthread_mtx); /* process the request */ PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po, lb->plb_base, lb->plb_ptr); /* change our thread's credentials before issuing the I/O */ aiov.iov_base = lb->plb_base; aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base; auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = -1; auio.uio_resid = nbytes; auio.uio_rw = UIO_WRITE; auio.uio_segflg = UIO_SYSSPACE; auio.uio_td = td; /* switch thread credentials -- see kern_ktrace.c */ td->td_ucred = ownercred; error = fo_write(po->po_file, &auio, ownercred, 0, td); td->td_ucred = mycred; if (error) { /* XXX some errors are recoverable */ /* send a SIGIO to the owner and exit */ PROC_LOCK(p); kern_psignal(p, SIGIO); PROC_UNLOCK(p); mtx_lock(&pmc_kthread_mtx); po->po_error = error; /* save for flush log */ PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error); break; } mtx_lock(&pmc_kthread_mtx); /* put the used buffer back into the global pool */ PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); pmc_plb_rele(lb); lb = NULL; } wakeup_one(po->po_kthread); po->po_kthread = NULL; mtx_unlock(&pmc_kthread_mtx); /* return the current I/O buffer to the global pool */ if (lb) { PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); pmc_plb_rele(lb); } /* * Exit this thread, signalling the waiter */ crfree(ownercred); kproc_exit(0); } /* * Release and log entry and schedule an I/O if needed. */ static void pmclog_release_flags(struct pmc_owner *po, int wakeup) { struct pmclog_buffer *plb; plb = po->po_curbuf[curcpu]; KASSERT(plb->plb_ptr >= plb->plb_base, ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, po, plb->plb_ptr, plb->plb_base)); KASSERT(plb->plb_ptr <= plb->plb_fence, ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, po, plb->plb_ptr, plb->plb_fence)); /* schedule an I/O if we've filled a buffer */ if (plb->plb_ptr >= plb->plb_fence) pmclog_schedule_io(po, wakeup); PMCDBG1(LOG,REL,1, "po=%p", po); } static void pmclog_release(struct pmc_owner *po) { pmclog_release_flags(po, 1); } /* * Attempt to reserve 'length' bytes of space in an owner's log * buffer. The function returns a pointer to 'length' bytes of space * if there was enough space or returns NULL if no space was * available. Non-null returns do so with the po mutex locked. The * caller must invoke pmclog_release() on the pmc owner structure * when done. */ static uint32_t * pmclog_reserve(struct pmc_owner *po, int length) { uintptr_t newptr, oldptr __diagused; struct pmclog_buffer *plb, **pplb; PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length); KASSERT(length % sizeof(uint32_t) == 0, ("[pmclog,%d] length not a multiple of word size", __LINE__)); /* No more data when shutdown in progress. */ if (po->po_flags & PMC_PO_SHUTDOWN) return (NULL); pplb = &po->po_curbuf[curcpu]; if (*pplb == NULL && pmclog_get_buffer(po) != 0) goto fail; KASSERT(*pplb != NULL, ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); plb = *pplb; KASSERT(plb->plb_ptr >= plb->plb_base && plb->plb_ptr <= plb->plb_fence, ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", __LINE__, po, plb->plb_ptr, plb->plb_base, plb->plb_fence)); oldptr = (uintptr_t) plb->plb_ptr; newptr = oldptr + length; KASSERT(oldptr != (uintptr_t) NULL, ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po)); /* * If we have space in the current buffer, return a pointer to * available space with the PO structure locked. */ if (newptr <= (uintptr_t) plb->plb_fence) { plb->plb_ptr = (char *) newptr; goto done; } /* * Otherwise, schedule the current buffer for output and get a * fresh buffer. */ pmclog_schedule_io(po, 0); if (pmclog_get_buffer(po) != 0) goto fail; plb = *pplb; KASSERT(plb != NULL, ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); KASSERT(plb->plb_ptr != NULL, ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__)); KASSERT(plb->plb_ptr == plb->plb_base && plb->plb_ptr <= plb->plb_fence, ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", __LINE__, po, plb->plb_ptr, plb->plb_base, plb->plb_fence)); oldptr = (uintptr_t) plb->plb_ptr; done: return ((uint32_t *) oldptr); fail: return (NULL); } /* * Schedule an I/O. * * Transfer the current buffer to the helper kthread. */ static void pmclog_schedule_io(struct pmc_owner *po, int wakeup) { struct pmclog_buffer *plb; plb = po->po_curbuf[curcpu]; po->po_curbuf[curcpu] = NULL; KASSERT(plb != NULL, ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po)); KASSERT(plb->plb_ptr >= plb->plb_base, ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, po, plb->plb_ptr, plb->plb_base)); KASSERT(plb->plb_ptr <= plb->plb_fence, ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, po, plb->plb_ptr, plb->plb_fence)); PMCDBG1(LOG,SIO, 1, "po=%p", po); /* * Add the current buffer to the tail of the buffer list and * wakeup the helper. */ mtx_lock_spin(&po->po_mtx); TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next); mtx_unlock_spin(&po->po_mtx); if (wakeup) wakeup_one(po); } /* * Stop the helper kthread. */ static void pmclog_stop_kthread(struct pmc_owner *po) { mtx_lock(&pmc_kthread_mtx); po->po_flags &= ~PMC_PO_OWNS_LOGFILE; if (po->po_kthread != NULL) { PROC_LOCK(po->po_kthread); kern_psignal(po->po_kthread, SIGHUP); PROC_UNLOCK(po->po_kthread); } wakeup_one(po); while (po->po_kthread) msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0); mtx_unlock(&pmc_kthread_mtx); } /* * Public functions */ /* * Configure a log file for pmc owner 'po'. * * Parameter 'logfd' is a file handle referencing an open file in the * owner process. This file needs to have been opened for writing. */ int pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) { struct proc *p; struct timespec ts; int error; sx_assert(&pmc_sx, SA_XLOCKED); PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); p = po->po_owner; /* return EBUSY if a log file was already present */ if (po->po_flags & PMC_PO_OWNS_LOGFILE) return (EBUSY); KASSERT(po->po_file == NULL, ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, po->po_file)); /* get a reference to the file state */ error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file); if (error) goto error; /* mark process as owning a log file */ po->po_flags |= PMC_PO_OWNS_LOGFILE; /* mark process as using HWPMCs */ PROC_LOCK(p); p->p_flag |= P_HWPMC; PROC_UNLOCK(p); nanotime(&ts); /* create a log initialization entry */ PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE, sizeof(struct pmclog_initialize)); PMCLOG_EMIT32(PMC_VERSION); PMCLOG_EMIT32(md->pmd_cputype); #if defined(__i386__) || defined(__amd64__) PMCLOG_EMIT64(tsc_freq); #else /* other architectures will need to fill this in */ PMCLOG_EMIT32(0); PMCLOG_EMIT32(0); #endif memcpy(_le, &ts, sizeof(ts)); _le += sizeof(ts)/4; PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN); PMCLOG_DESPATCH_SYNC(po); return (0); error: KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " "stopped", __LINE__, po)); if (po->po_file) (void) fdrop(po->po_file, curthread); po->po_file = NULL; /* clear file and error state */ po->po_error = 0; po->po_flags &= ~PMC_PO_OWNS_LOGFILE; return (error); } /* * De-configure a log file. This will throw away any buffers queued * for this owner process. */ int pmclog_deconfigure_log(struct pmc_owner *po) { int error; struct pmclog_buffer *lb; struct pmc_binding pb; PMCDBG1(LOG,CFG,1, "de-config po=%p", po); if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) return (EINVAL); KASSERT(po->po_sscount == 0, ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po)); KASSERT(po->po_file != NULL, ("[pmclog,%d] po=%p no log file", __LINE__, po)); /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */ pmclog_stop_kthread(po); KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po)); /* return all queued log buffers to the global pool */ while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) { TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); pmc_plb_rele(lb); } pmc_save_cpu_binding(&pb); for (int i = 0; i < mp_ncpus; i++) { pmc_select_cpu(i); /* return the 'current' buffer to the global pool */ if ((lb = po->po_curbuf[curcpu]) != NULL) { PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); pmc_plb_rele(lb); } } pmc_restore_cpu_binding(&pb); /* drop a reference to the fd */ if (po->po_file != NULL) { error = fdrop(po->po_file, curthread); po->po_file = NULL; } else error = 0; po->po_error = 0; return (error); } /* * Flush a process' log buffer. */ int pmclog_flush(struct pmc_owner *po, int force) { int error; PMCDBG1(LOG,FLS,1, "po=%p", po); /* * If there is a pending error recorded by the logger thread, * return that. */ if (po->po_error) return (po->po_error); error = 0; /* * Check that we do have an active log file. */ mtx_lock(&pmc_kthread_mtx); if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { error = EINVAL; goto error; } pmclog_schedule_all(po); error: mtx_unlock(&pmc_kthread_mtx); return (error); } static void pmclog_schedule_one_cond(struct pmc_owner *po) { struct pmclog_buffer *plb; int cpu; spinlock_enter(); cpu = curcpu; /* tell hardclock not to run again */ if (PMC_CPU_HAS_SAMPLES(cpu)) PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); plb = po->po_curbuf[cpu]; if (plb && plb->plb_ptr != plb->plb_base) pmclog_schedule_io(po, 1); spinlock_exit(); } static void pmclog_schedule_all(struct pmc_owner *po) { struct pmc_binding pb; /* * Schedule the current buffer if any and not empty. */ pmc_save_cpu_binding(&pb); for (int i = 0; i < mp_ncpus; i++) { pmc_select_cpu(i); pmclog_schedule_one_cond(po); } pmc_restore_cpu_binding(&pb); } int pmclog_close(struct pmc_owner *po) { PMCDBG1(LOG,CLO,1, "po=%p", po); pmclog_process_closelog(po); mtx_lock(&pmc_kthread_mtx); /* * Initiate shutdown: no new data queued, * thread will close file on last block. */ po->po_flags |= PMC_PO_SHUTDOWN; /* give time for all to see */ DELAY(50); /* * Schedule the current buffer. */ pmclog_schedule_all(po); wakeup_one(po); mtx_unlock(&pmc_kthread_mtx); return (0); } void pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps) { int n, recordlen; uint32_t flags; struct pmc_owner *po; PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid, ps->ps_nsamples); recordlen = offsetof(struct pmclog_callchain, pl_pc) + ps->ps_nsamples * sizeof(uintfptr_t); po = pm->pm_owner; flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags); PMCLOG_RESERVE_SAFE(po, CALLCHAIN, recordlen, ps->ps_tsc); PMCLOG_EMIT32(ps->ps_pid); PMCLOG_EMIT32(ps->ps_tid); PMCLOG_EMIT32(pm->pm_id); PMCLOG_EMIT32(flags); for (n = 0; n < ps->ps_nsamples; n++) PMCLOG_EMITADDR(ps->ps_pc[n]); PMCLOG_DESPATCH_SAFE(po); } void pmclog_process_closelog(struct pmc_owner *po) { PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog)); PMCLOG_DESPATCH_SYNC(po); } void pmclog_process_dropnotify(struct pmc_owner *po) { PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify)); PMCLOG_DESPATCH(po); } void pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start, const char *path) { int pathlen, recordlen; KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__)); pathlen = strlen(path) + 1; /* #bytes for path name */ recordlen = offsetof(struct pmclog_map_in, pl_pathname) + pathlen; PMCLOG_RESERVE(po, MAP_IN, recordlen); PMCLOG_EMIT32(pid); PMCLOG_EMIT32(0); PMCLOG_EMITADDR(start); PMCLOG_EMITSTRING(path,pathlen); PMCLOG_DESPATCH_SYNC(po); } void pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start, uintfptr_t end) { KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__)); PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out)); PMCLOG_EMIT32(pid); PMCLOG_EMIT32(0); PMCLOG_EMITADDR(start); PMCLOG_EMITADDR(end); PMCLOG_DESPATCH(po); } void pmclog_process_pmcallocate(struct pmc *pm) { struct pmc_owner *po; struct pmc_soft *ps; po = pm->pm_owner; PMCDBG1(LOG,ALL,1, "pm=%p", pm); if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { PMCLOG_RESERVE(po, PMCALLOCATEDYN, sizeof(struct pmclog_pmcallocatedyn)); PMCLOG_EMIT32(pm->pm_id); PMCLOG_EMIT32(pm->pm_event); PMCLOG_EMIT32(pm->pm_flags); PMCLOG_EMIT32(0); PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); ps = pmc_soft_ev_acquire(pm->pm_event); if (ps != NULL) PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); else PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); pmc_soft_ev_release(ps); PMCLOG_DESPATCH_SYNC(po); } else { PMCLOG_RESERVE(po, PMCALLOCATE, sizeof(struct pmclog_pmcallocate)); PMCLOG_EMIT32(pm->pm_id); PMCLOG_EMIT32(pm->pm_event); PMCLOG_EMIT32(pm->pm_flags); PMCLOG_EMIT32(0); PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); PMCLOG_DESPATCH_SYNC(po); } } void pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path) { int pathlen, recordlen; struct pmc_owner *po; PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid); po = pm->pm_owner; pathlen = strlen(path) + 1; /* #bytes for the string */ recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen; PMCLOG_RESERVE(po, PMCATTACH, recordlen); PMCLOG_EMIT32(pm->pm_id); PMCLOG_EMIT32(pid); PMCLOG_EMITSTRING(path, pathlen); PMCLOG_DESPATCH_SYNC(po); } void pmclog_process_pmcdetach(struct pmc *pm, pid_t pid) { struct pmc_owner *po; PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid); po = pm->pm_owner; PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach)); PMCLOG_EMIT32(pm->pm_id); PMCLOG_EMIT32(pid); PMCLOG_DESPATCH_SYNC(po); } void pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync) { if (sync) { PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); PMCLOG_EMIT32(p->p_pid); PMCLOG_EMIT32(p->p_flag); PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); PMCLOG_DESPATCH_SYNC(po); } else { PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); PMCLOG_EMIT32(p->p_pid); PMCLOG_EMIT32(p->p_flag); PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); PMCLOG_DESPATCH(po); } } /* * Log a context switch event to the log file. */ void pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td) { struct pmc_owner *po; KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW, ("[pmclog,%d] log-process-csw called gratuitously", __LINE__)); PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, v); po = pm->pm_owner; PMCLOG_RESERVE_SAFE(po, PROCCSW, sizeof(struct pmclog_proccsw), pmc_rdtsc()); PMCLOG_EMIT64(v); PMCLOG_EMIT32(pm->pm_id); PMCLOG_EMIT32(pp->pp_proc->p_pid); PMCLOG_EMIT32(td->td_tid); PMCLOG_EMIT32(0); PMCLOG_DESPATCH_SCHED_LOCK(po); } void pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid, uintfptr_t startaddr, char *path) { int pathlen, recordlen; PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path); pathlen = strlen(path) + 1; /* #bytes for the path */ recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen; PMCLOG_RESERVE(po, PROCEXEC, recordlen); PMCLOG_EMIT32(pid); PMCLOG_EMIT32(pmid); PMCLOG_EMITADDR(startaddr); PMCLOG_EMITSTRING(path,pathlen); PMCLOG_DESPATCH_SYNC(po); } /* * Log a process exit event (and accumulated pmc value) to the log file. */ void pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp) { int ri; struct pmc_owner *po; ri = PMC_TO_ROWINDEX(pm); PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, pp->pp_pmcs[ri].pp_pmcval); po = pm->pm_owner; PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit)); PMCLOG_EMIT32(pm->pm_id); PMCLOG_EMIT32(pp->pp_proc->p_pid); PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval); PMCLOG_DESPATCH(po); } /* * Log a fork event. */ void pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid) { PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork)); PMCLOG_EMIT32(oldpid); PMCLOG_EMIT32(newpid); PMCLOG_DESPATCH(po); } /* * Log a process exit event of the form suitable for system-wide PMCs. */ void pmclog_process_sysexit(struct pmc_owner *po, pid_t pid) { PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit)); PMCLOG_EMIT32(pid); PMCLOG_DESPATCH(po); } void pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync) { struct proc *p; p = td->td_proc; if (sync) { PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); PMCLOG_EMIT32(td->td_tid); PMCLOG_EMIT32(p->p_pid); PMCLOG_EMIT32(p->p_flag); PMCLOG_EMIT32(0); PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); PMCLOG_DESPATCH_SYNC(po); } else { PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); PMCLOG_EMIT32(td->td_tid); PMCLOG_EMIT32(p->p_pid); PMCLOG_EMIT32(p->p_flag); PMCLOG_EMIT32(0); PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); PMCLOG_DESPATCH(po); } } void pmclog_process_threadexit(struct pmc_owner *po, struct thread *td) { PMCLOG_RESERVE(po, THR_EXIT, sizeof(struct pmclog_threadexit)); PMCLOG_EMIT32(td->td_tid); PMCLOG_DESPATCH(po); } /* * Write a user log entry. */ int pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) { int error; PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); error = 0; PMCLOG_RESERVE_WITH_ERROR(po, USERDATA, sizeof(struct pmclog_userdata)); PMCLOG_EMIT32(wl->pm_userdata); PMCLOG_DESPATCH(po); error: return (error); } /* * Initialization. * * Create a pool of log buffers and initialize mutexes. */ void pmclog_initialize() { struct pmclog_buffer *plb; int domain, ncpus, total; if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) { (void) printf("hwpmc: tunable logbuffersize=%d must be " "greater than zero and less than or equal to 16MB.\n", pmclog_buffer_size); pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; } if (pmc_nlogbuffers_pcpu <= 0) { (void) printf("hwpmc: tunable nlogbuffers=%d must be greater " "than zero.\n", pmc_nlogbuffers_pcpu); pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; } if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) { (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n", pmc_nlogbuffers_pcpu*pmclog_buffer_size); pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; } for (domain = 0; domain < vm_ndomains; domain++) { ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus; total = ncpus * pmc_nlogbuffers_pcpu; plb = malloc_domainset(sizeof(struct pmclog_buffer) * total, M_PMC, DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); pmc_dom_hdrs[domain]->pdbh_plbs = plb; for (; total > 0; total--, plb++) { void *buf; buf = malloc_domainset(1024 * pmclog_buffer_size, M_PMC, DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain); pmc_plb_rele_unlocked(plb); } } mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF); } /* * Shutdown logging. * * Destroy mutexes and release memory back the to free pool. */ void pmclog_shutdown() { struct pmclog_buffer *plb; int domain; mtx_destroy(&pmc_kthread_mtx); for (domain = 0; domain < vm_ndomains; domain++) { while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) { TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); free(plb->plb_base, M_PMC); } free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC); } }