4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
21 * Portions Copyright 2010 The FreeBSD Foundation
27 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
28 * Use is subject to license terms.
32 #pragma ident "%Z%%M% %I% %E% SMI"
35 #include <sys/atomic.h>
36 #include <sys/errno.h>
38 #include <sys/modctl.h>
40 #include <sys/systm.h>
44 #include <sys/sunddi.h>
45 #include <sys/cpuvar.h>
48 #include <sys/strsubr.h>
50 #include <sys/fasttrap.h>
51 #include <sys/fasttrap_impl.h>
52 #include <sys/fasttrap_isa.h>
53 #include <sys/dtrace.h>
54 #include <sys/dtrace_impl.h>
55 #include <sys/sysmacros.h>
57 #include <sys/policy.h>
59 #include <util/qsort.h>
61 #include <sys/mutex.h>
62 #include <sys/kernel.h>
65 #include <sys/dtrace_bsd.h>
66 #include <cddl/dev/dtrace/dtrace_cddl.h>
70 * User-Land Trap-Based Tracing
71 * ----------------------------
73 * The fasttrap provider allows DTrace consumers to instrument any user-level
74 * instruction to gather data; this includes probes with semantic
75 * signifigance like entry and return as well as simple offsets into the
76 * function. While the specific techniques used are very ISA specific, the
77 * methodology is generalizable to any architecture.
80 * The General Methodology
81 * -----------------------
83 * With the primary goal of tracing every user-land instruction and the
84 * limitation that we can't trust user space so don't want to rely on much
85 * information there, we begin by replacing the instructions we want to trace
86 * with trap instructions. Each instruction we overwrite is saved into a hash
87 * table keyed by process ID and pc address. When we enter the kernel due to
88 * this trap instruction, we need the effects of the replaced instruction to
89 * appear to have occurred before we proceed with the user thread's
92 * Each user level thread is represented by a ulwp_t structure which is
93 * always easily accessible through a register. The most basic way to produce
94 * the effects of the instruction we replaced is to copy that instruction out
95 * to a bit of scratch space reserved in the user thread's ulwp_t structure
96 * (a sort of kernel-private thread local storage), set the PC to that
97 * scratch space and single step. When we reenter the kernel after single
98 * stepping the instruction we must then adjust the PC to point to what would
99 * normally be the next instruction. Of course, special care must be taken
100 * for branches and jumps, but these represent such a small fraction of any
101 * instruction set that writing the code to emulate these in the kernel is
104 * Return probes may require several tracepoints to trace every return site,
105 * and, conversely, each tracepoint may activate several probes (the entry
106 * and offset 0 probes, for example). To solve this muliplexing problem,
107 * tracepoints contain lists of probes to activate and probes contain lists
108 * of tracepoints to enable. If a probe is activated, it adds its ID to
109 * existing tracepoints or creates new ones as necessary.
111 * Most probes are activated _before_ the instruction is executed, but return
112 * probes are activated _after_ the effects of the last instruction of the
113 * function are visible. Return probes must be fired _after_ we have
114 * single-stepped the instruction whereas all other probes are fired
121 * The lock ordering below -- both internally and with respect to the DTrace
122 * framework -- is a little tricky and bears some explanation. Each provider
123 * has a lock (ftp_mtx) that protects its members including reference counts
124 * for enabled probes (ftp_rcount), consumers actively creating probes
125 * (ftp_ccount) and USDT consumers (ftp_mcount); all three prevent a provider
126 * from being freed. A provider is looked up by taking the bucket lock for the
127 * provider hash table, and is returned with its lock held. The provider lock
128 * may be taken in functions invoked by the DTrace framework, but may not be
129 * held while calling functions in the DTrace framework.
131 * To ensure consistency over multiple calls to the DTrace framework, the
132 * creation lock (ftp_cmtx) should be held. Naturally, the creation lock may
133 * not be taken when holding the provider lock as that would create a cyclic
134 * lock ordering. In situations where one would naturally take the provider
135 * lock and then the creation lock, we instead up a reference count to prevent
136 * the provider from disappearing, drop the provider lock, and acquire the
140 * bucket lock before provider lock
141 * DTrace before provider lock
142 * creation lock before DTrace
143 * never hold the provider lock and creation lock simultaneously
146 static d_open_t fasttrap_open;
147 static d_ioctl_t fasttrap_ioctl;
149 static struct cdevsw fasttrap_cdevsw = {
150 .d_version = D_VERSION,
151 .d_open = fasttrap_open,
152 .d_ioctl = fasttrap_ioctl,
153 .d_name = "fasttrap",
155 static struct cdev *fasttrap_cdev;
156 static dtrace_meta_provider_id_t fasttrap_meta_id;
158 static struct proc *fasttrap_cleanup_proc;
159 static struct mtx fasttrap_cleanup_mtx;
160 static uint_t fasttrap_cleanup_work, fasttrap_cleanup_drain, fasttrap_cleanup_cv;
163 * Generation count on modifications to the global tracepoint lookup table.
165 static volatile uint64_t fasttrap_mod_gen;
168 * When the fasttrap provider is loaded, fasttrap_max is set to either
169 * FASTTRAP_MAX_DEFAULT or the value for fasttrap-max-probes in the
170 * fasttrap.conf file. Each time a probe is created, fasttrap_total is
171 * incremented by the number of tracepoints that may be associated with that
172 * probe; fasttrap_total is capped at fasttrap_max.
174 #define FASTTRAP_MAX_DEFAULT 250000
175 static uint32_t fasttrap_max;
176 static uint32_t fasttrap_total;
179 * Copyright (c) 2011, Joyent, Inc. All rights reserved.
182 #define FASTTRAP_TPOINTS_DEFAULT_SIZE 0x4000
183 #define FASTTRAP_PROVIDERS_DEFAULT_SIZE 0x100
184 #define FASTTRAP_PROCS_DEFAULT_SIZE 0x100
186 #define FASTTRAP_PID_NAME "pid"
188 fasttrap_hash_t fasttrap_tpoints;
189 static fasttrap_hash_t fasttrap_provs;
190 static fasttrap_hash_t fasttrap_procs;
192 static uint64_t fasttrap_pid_count; /* pid ref count */
193 static kmutex_t fasttrap_count_mtx; /* lock on ref count */
195 #define FASTTRAP_ENABLE_FAIL 1
196 #define FASTTRAP_ENABLE_PARTIAL 2
198 static int fasttrap_tracepoint_enable(proc_t *, fasttrap_probe_t *, uint_t);
199 static void fasttrap_tracepoint_disable(proc_t *, fasttrap_probe_t *, uint_t);
201 static fasttrap_provider_t *fasttrap_provider_lookup(pid_t, const char *,
202 const dtrace_pattr_t *);
203 static void fasttrap_provider_retire(pid_t, const char *, int);
204 static void fasttrap_provider_free(fasttrap_provider_t *);
206 static fasttrap_proc_t *fasttrap_proc_lookup(pid_t);
207 static void fasttrap_proc_release(fasttrap_proc_t *);
209 #define FASTTRAP_PROVS_INDEX(pid, name) \
210 ((fasttrap_hash_str(name) + (pid)) & fasttrap_provs.fth_mask)
212 #define FASTTRAP_PROCS_INDEX(pid) ((pid) & fasttrap_procs.fth_mask)
215 static kmutex_t fasttrap_cpuc_pid_lock[MAXCPU];
219 fasttrap_highbit(ulong_t i)
226 if (i & 0xffffffff00000000ul) {
230 if (i & 0xffff0000) {
249 fasttrap_hash_str(const char *p)
255 hval = (hval << 4) + *p++;
256 if ((g = (hval & 0xf0000000)) != 0)
264 fasttrap_sigtrap(proc_t *p, kthread_t *t, uintptr_t pc)
267 sigqueue_t *sqp = kmem_zalloc(sizeof (sigqueue_t), KM_SLEEP);
269 sqp->sq_info.si_signo = SIGTRAP;
270 sqp->sq_info.si_code = TRAP_DTRACE;
271 sqp->sq_info.si_addr = (caddr_t)pc;
273 mutex_enter(&p->p_lock);
275 mutex_exit(&p->p_lock);
280 ksiginfo_t *ksi = kmem_zalloc(sizeof (ksiginfo_t), KM_SLEEP);
283 ksi->ksi_signo = SIGTRAP;
284 ksi->ksi_code = TRAP_DTRACE;
285 ksi->ksi_addr = (caddr_t)pc;
287 (void) tdksignal(t, SIGTRAP, ksi);
293 * This function ensures that no threads are actively using the memory
294 * associated with probes that were formerly live.
297 fasttrap_mod_barrier(uint64_t gen)
301 if (gen < fasttrap_mod_gen)
307 mutex_enter(&fasttrap_cpuc_pid_lock[i]);
308 mutex_exit(&fasttrap_cpuc_pid_lock[i]);
313 * This function performs asynchronous cleanup of fasttrap providers. The
314 * Solaris implementation of this mechanism use a timeout that's activated in
315 * fasttrap_pid_cleanup(), but this doesn't work in FreeBSD: one may sleep while
316 * holding the DTrace mutexes, but it is unsafe to sleep in a callout handler.
317 * Thus we use a dedicated process to perform the cleanup when requested.
321 fasttrap_pid_cleanup_cb(void *data)
323 fasttrap_provider_t **fpp, *fp;
324 fasttrap_bucket_t *bucket;
325 dtrace_provider_id_t provid;
326 int i, later = 0, rval;
328 mtx_lock(&fasttrap_cleanup_mtx);
329 while (!fasttrap_cleanup_drain || later > 0) {
330 fasttrap_cleanup_work = 0;
331 mtx_unlock(&fasttrap_cleanup_mtx);
336 * Iterate over all the providers trying to remove the marked
337 * ones. If a provider is marked but not retired, we just
338 * have to take a crack at removing it -- it's no big deal if
341 for (i = 0; i < fasttrap_provs.fth_nent; i++) {
342 bucket = &fasttrap_provs.fth_table[i];
343 mutex_enter(&bucket->ftb_mtx);
344 fpp = (fasttrap_provider_t **)&bucket->ftb_data;
346 while ((fp = *fpp) != NULL) {
347 if (!fp->ftp_marked) {
352 mutex_enter(&fp->ftp_mtx);
355 * If this provider has consumers actively
356 * creating probes (ftp_ccount) or is a USDT
357 * provider (ftp_mcount), we can't unregister
360 if (fp->ftp_ccount != 0 ||
361 fp->ftp_mcount != 0) {
362 mutex_exit(&fp->ftp_mtx);
367 if (!fp->ftp_retired || fp->ftp_rcount != 0)
370 mutex_exit(&fp->ftp_mtx);
373 * If we successfully unregister this
374 * provider we can remove it from the hash
375 * chain and free the memory. If our attempt
376 * to unregister fails and this is a retired
377 * provider, increment our flag to try again
378 * pretty soon. If we've consumed more than
379 * half of our total permitted number of
380 * probes call dtrace_condense() to try to
381 * clean out the unenabled probes.
383 provid = fp->ftp_provid;
384 if ((rval = dtrace_unregister(provid)) != 0) {
385 if (fasttrap_total > fasttrap_max / 2)
386 (void) dtrace_condense(provid);
391 later += fp->ftp_marked;
395 fasttrap_provider_free(fp);
398 mutex_exit(&bucket->ftb_mtx);
400 mtx_lock(&fasttrap_cleanup_mtx);
403 * If we were unable to retire a provider, try again after a
404 * second. This situation can occur in certain circumstances
405 * where providers cannot be unregistered even though they have
406 * no probes enabled because of an execution of dtrace -l or
409 if (later > 0 || fasttrap_cleanup_work ||
410 fasttrap_cleanup_drain) {
411 mtx_unlock(&fasttrap_cleanup_mtx);
412 pause("ftclean", hz);
413 mtx_lock(&fasttrap_cleanup_mtx);
415 mtx_sleep(&fasttrap_cleanup_cv, &fasttrap_cleanup_mtx,
420 * Wake up the thread in fasttrap_unload() now that we're done.
422 wakeup(&fasttrap_cleanup_drain);
423 mtx_unlock(&fasttrap_cleanup_mtx);
429 * Activates the asynchronous cleanup mechanism.
432 fasttrap_pid_cleanup(void)
435 mtx_lock(&fasttrap_cleanup_mtx);
436 if (!fasttrap_cleanup_work) {
437 fasttrap_cleanup_work = 1;
438 wakeup(&fasttrap_cleanup_cv);
440 mtx_unlock(&fasttrap_cleanup_mtx);
444 * This is called from cfork() via dtrace_fasttrap_fork(). The child
445 * process's address space is (roughly) a copy of the parent process's so
446 * we have to remove all the instrumentation we had previously enabled in the
450 fasttrap_fork(proc_t *p, proc_t *cp)
452 pid_t ppid = p->p_pid;
456 ASSERT(curproc == p);
457 ASSERT(p->p_proc_flag & P_PR_LOCK);
459 PROC_LOCK_ASSERT(p, MA_OWNED);
462 ASSERT(p->p_dtrace_count > 0);
464 if (p->p_dtrace_helpers) {
466 * dtrace_helpers_duplicate() allocates memory.
471 dtrace_helpers_duplicate(p, cp);
477 * This check is purposely here instead of in kern_fork.c because,
478 * for legal resons, we cannot include the dtrace_cddl.h header
479 * inside kern_fork.c and insert if-clause there.
481 if (p->p_dtrace_count == 0)
484 ASSERT(cp->p_dtrace_count == 0);
487 * This would be simpler and faster if we maintained per-process
488 * hash tables of enabled tracepoints. It could, however, potentially
489 * slow down execution of a tracepoint since we'd need to go
490 * through two levels of indirection. In the future, we should
491 * consider either maintaining per-process ancillary lists of
492 * enabled tracepoints or hanging a pointer to a per-process hash
493 * table of enabled tracepoints off the proc structure.
497 * We don't have to worry about the child process disappearing
498 * because we're in fork().
501 mtx_lock_spin(&cp->p_slock);
503 mtx_unlock_spin(&cp->p_slock);
509 * Iterate over every tracepoint looking for ones that belong to the
510 * parent process, and remove each from the child process.
512 for (i = 0; i < fasttrap_tpoints.fth_nent; i++) {
513 fasttrap_tracepoint_t *tp;
514 fasttrap_bucket_t *bucket = &fasttrap_tpoints.fth_table[i];
516 mutex_enter(&bucket->ftb_mtx);
517 for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) {
518 if (tp->ftt_pid == ppid &&
519 tp->ftt_proc->ftpc_acount != 0) {
520 int ret = fasttrap_tracepoint_remove(cp, tp);
524 * The count of active providers can only be
525 * decremented (i.e. to zero) during exec,
526 * exit, and removal of a meta provider so it
527 * should be impossible to drop the count
530 ASSERT(tp->ftt_proc->ftpc_acount != 0);
533 mutex_exit(&bucket->ftb_mtx);
537 mutex_enter(&cp->p_lock);
545 * This is called from proc_exit() or from exec_common() if p_dtrace_probes
546 * is set on the proc structure to indicate that there is a pid provider
547 * associated with this process.
550 fasttrap_exec_exit(proc_t *p)
553 ASSERT(p == curproc);
555 PROC_LOCK_ASSERT(p, MA_OWNED);
560 * We clean up the pid provider for this process here; user-land
561 * static probes are handled by the meta-provider remove entry point.
563 fasttrap_provider_retire(p->p_pid, FASTTRAP_PID_NAME, 0);
565 if (p->p_dtrace_helpers)
566 dtrace_helpers_destroy(p);
575 fasttrap_pid_provide(void *arg, dtrace_probedesc_t *desc)
578 * There are no "default" pid probes.
583 fasttrap_tracepoint_enable(proc_t *p, fasttrap_probe_t *probe, uint_t index)
585 fasttrap_tracepoint_t *tp, *new_tp = NULL;
586 fasttrap_bucket_t *bucket;
591 ASSERT(index < probe->ftp_ntps);
593 pid = probe->ftp_pid;
594 pc = probe->ftp_tps[index].fit_tp->ftt_pc;
595 id = &probe->ftp_tps[index].fit_id;
597 ASSERT(probe->ftp_tps[index].fit_tp->ftt_pid == pid);
600 ASSERT(!(p->p_flag & SVFORK));
604 * Before we make any modifications, make sure we've imposed a barrier
605 * on the generation in which this probe was last modified.
607 fasttrap_mod_barrier(probe->ftp_gen);
609 bucket = &fasttrap_tpoints.fth_table[FASTTRAP_TPOINTS_INDEX(pid, pc)];
612 * If the tracepoint has already been enabled, just add our id to the
613 * list of interested probes. This may be our second time through
614 * this path in which case we'll have constructed the tracepoint we'd
615 * like to install. If we can't find a match, and have an allocated
616 * tracepoint ready to go, enable that one now.
618 * A tracepoint whose process is defunct is also considered defunct.
621 mutex_enter(&bucket->ftb_mtx);
622 for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) {
624 * Note that it's safe to access the active count on the
625 * associated proc structure because we know that at least one
626 * provider (this one) will still be around throughout this
629 if (tp->ftt_pid != pid || tp->ftt_pc != pc ||
630 tp->ftt_proc->ftpc_acount == 0)
634 * Now that we've found a matching tracepoint, it would be
635 * a decent idea to confirm that the tracepoint is still
636 * enabled and the trap instruction hasn't been overwritten.
637 * Since this is a little hairy, we'll punt for now.
641 * This can't be the first interested probe. We don't have
642 * to worry about another thread being in the midst of
643 * deleting this tracepoint (which would be the only valid
644 * reason for a tracepoint to have no interested probes)
645 * since we're holding P_PR_LOCK for this process.
647 ASSERT(tp->ftt_ids != NULL || tp->ftt_retids != NULL);
649 switch (id->fti_ptype) {
652 case DTFTP_IS_ENABLED:
653 id->fti_next = tp->ftt_ids;
660 case DTFTP_POST_OFFSETS:
661 id->fti_next = tp->ftt_retids;
671 mutex_exit(&bucket->ftb_mtx);
673 if (new_tp != NULL) {
674 new_tp->ftt_ids = NULL;
675 new_tp->ftt_retids = NULL;
682 * If we have a good tracepoint ready to go, install it now while
683 * we have the lock held and no one can screw with us.
685 if (new_tp != NULL) {
688 new_tp->ftt_next = bucket->ftb_data;
690 bucket->ftb_data = new_tp;
692 mutex_exit(&bucket->ftb_mtx);
695 * Activate the tracepoint in the ISA-specific manner.
696 * If this fails, we need to report the failure, but
697 * indicate that this tracepoint must still be disabled
698 * by calling fasttrap_tracepoint_disable().
700 if (fasttrap_tracepoint_install(p, new_tp) != 0)
701 rc = FASTTRAP_ENABLE_PARTIAL;
704 * Increment the count of the number of tracepoints active in
705 * the victim process.
708 ASSERT(p->p_proc_flag & P_PR_LOCK);
715 mutex_exit(&bucket->ftb_mtx);
718 * Initialize the tracepoint that's been preallocated with the probe.
720 new_tp = probe->ftp_tps[index].fit_tp;
722 ASSERT(new_tp->ftt_pid == pid);
723 ASSERT(new_tp->ftt_pc == pc);
724 ASSERT(new_tp->ftt_proc == probe->ftp_prov->ftp_proc);
725 ASSERT(new_tp->ftt_ids == NULL);
726 ASSERT(new_tp->ftt_retids == NULL);
728 switch (id->fti_ptype) {
731 case DTFTP_IS_ENABLED:
733 new_tp->ftt_ids = id;
737 case DTFTP_POST_OFFSETS:
739 new_tp->ftt_retids = id;
747 * If the ISA-dependent initialization goes to plan, go back to the
748 * beginning and try to install this freshly made tracepoint.
750 if (fasttrap_tracepoint_init(p, new_tp, pc, id->fti_ptype) == 0)
753 new_tp->ftt_ids = NULL;
754 new_tp->ftt_retids = NULL;
756 return (FASTTRAP_ENABLE_FAIL);
760 fasttrap_tracepoint_disable(proc_t *p, fasttrap_probe_t *probe, uint_t index)
762 fasttrap_bucket_t *bucket;
763 fasttrap_provider_t *provider = probe->ftp_prov;
764 fasttrap_tracepoint_t **pp, *tp;
765 fasttrap_id_t *id, **idp = NULL;
769 ASSERT(index < probe->ftp_ntps);
771 pid = probe->ftp_pid;
772 pc = probe->ftp_tps[index].fit_tp->ftt_pc;
773 id = &probe->ftp_tps[index].fit_id;
775 ASSERT(probe->ftp_tps[index].fit_tp->ftt_pid == pid);
778 * Find the tracepoint and make sure that our id is one of the
779 * ones registered with it.
781 bucket = &fasttrap_tpoints.fth_table[FASTTRAP_TPOINTS_INDEX(pid, pc)];
782 mutex_enter(&bucket->ftb_mtx);
783 for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) {
784 if (tp->ftt_pid == pid && tp->ftt_pc == pc &&
785 tp->ftt_proc == provider->ftp_proc)
790 * If we somehow lost this tracepoint, we're in a world of hurt.
794 switch (id->fti_ptype) {
797 case DTFTP_IS_ENABLED:
798 ASSERT(tp->ftt_ids != NULL);
803 case DTFTP_POST_OFFSETS:
804 ASSERT(tp->ftt_retids != NULL);
805 idp = &tp->ftt_retids;
812 while ((*idp)->fti_probe != probe) {
813 idp = &(*idp)->fti_next;
814 ASSERT(*idp != NULL);
821 ASSERT(id->fti_probe == probe);
824 * If there are other registered enablings of this tracepoint, we're
825 * all done, but if this was the last probe assocated with this
826 * this tracepoint, we need to remove and free it.
828 if (tp->ftt_ids != NULL || tp->ftt_retids != NULL) {
831 * If the current probe's tracepoint is in use, swap it
832 * for an unused tracepoint.
834 if (tp == probe->ftp_tps[index].fit_tp) {
835 fasttrap_probe_t *tmp_probe;
836 fasttrap_tracepoint_t **tmp_tp;
839 if (tp->ftt_ids != NULL) {
840 tmp_probe = tp->ftt_ids->fti_probe;
841 /* LINTED - alignment */
842 tmp_index = FASTTRAP_ID_INDEX(tp->ftt_ids);
843 tmp_tp = &tmp_probe->ftp_tps[tmp_index].fit_tp;
845 tmp_probe = tp->ftt_retids->fti_probe;
846 /* LINTED - alignment */
847 tmp_index = FASTTRAP_ID_INDEX(tp->ftt_retids);
848 tmp_tp = &tmp_probe->ftp_tps[tmp_index].fit_tp;
851 ASSERT(*tmp_tp != NULL);
852 ASSERT(*tmp_tp != probe->ftp_tps[index].fit_tp);
853 ASSERT((*tmp_tp)->ftt_ids == NULL);
854 ASSERT((*tmp_tp)->ftt_retids == NULL);
856 probe->ftp_tps[index].fit_tp = *tmp_tp;
860 mutex_exit(&bucket->ftb_mtx);
863 * Tag the modified probe with the generation in which it was
866 probe->ftp_gen = fasttrap_mod_gen;
870 mutex_exit(&bucket->ftb_mtx);
873 * We can't safely remove the tracepoint from the set of active
874 * tracepoints until we've actually removed the fasttrap instruction
875 * from the process's text. We can, however, operate on this
876 * tracepoint secure in the knowledge that no other thread is going to
877 * be looking at it since we hold P_PR_LOCK on the process if it's
878 * live or we hold the provider lock on the process if it's dead and
883 * We only need to remove the actual instruction if we're looking
884 * at an existing process
888 * If we fail to restore the instruction we need to kill
889 * this process since it's in a completely unrecoverable
892 if (fasttrap_tracepoint_remove(p, tp) != 0)
893 fasttrap_sigtrap(p, NULL, pc);
896 * Decrement the count of the number of tracepoints active
897 * in the victim process.
900 ASSERT(p->p_proc_flag & P_PR_LOCK);
906 * Remove the probe from the hash table of active tracepoints.
908 mutex_enter(&bucket->ftb_mtx);
909 pp = (fasttrap_tracepoint_t **)&bucket->ftb_data;
912 pp = &(*pp)->ftt_next;
919 mutex_exit(&bucket->ftb_mtx);
922 * Tag the modified probe with the generation in which it was changed.
924 probe->ftp_gen = fasttrap_mod_gen;
928 fasttrap_enable_callbacks(void)
931 * We don't have to play the rw lock game here because we're
932 * providing something rather than taking something away --
933 * we can be sure that no threads have tried to follow this
934 * function pointer yet.
936 mutex_enter(&fasttrap_count_mtx);
937 if (fasttrap_pid_count == 0) {
938 ASSERT(dtrace_pid_probe_ptr == NULL);
939 ASSERT(dtrace_return_probe_ptr == NULL);
940 dtrace_pid_probe_ptr = &fasttrap_pid_probe;
941 dtrace_return_probe_ptr = &fasttrap_return_probe;
943 ASSERT(dtrace_pid_probe_ptr == &fasttrap_pid_probe);
944 ASSERT(dtrace_return_probe_ptr == &fasttrap_return_probe);
945 fasttrap_pid_count++;
946 mutex_exit(&fasttrap_count_mtx);
950 fasttrap_disable_callbacks(void)
953 ASSERT(MUTEX_HELD(&cpu_lock));
957 mutex_enter(&fasttrap_count_mtx);
958 ASSERT(fasttrap_pid_count > 0);
959 fasttrap_pid_count--;
960 if (fasttrap_pid_count == 0) {
962 cpu_t *cur, *cpu = CPU;
964 for (cur = cpu->cpu_next_onln; cur != cpu;
965 cur = cur->cpu_next_onln) {
966 rw_enter(&cur->cpu_ft_lock, RW_WRITER);
969 dtrace_pid_probe_ptr = NULL;
970 dtrace_return_probe_ptr = NULL;
972 for (cur = cpu->cpu_next_onln; cur != cpu;
973 cur = cur->cpu_next_onln) {
974 rw_exit(&cur->cpu_ft_lock);
978 mutex_exit(&fasttrap_count_mtx);
983 fasttrap_pid_enable(void *arg, dtrace_id_t id, void *parg)
985 fasttrap_probe_t *probe = parg;
989 ASSERT(probe != NULL);
990 ASSERT(!probe->ftp_enabled);
991 ASSERT(id == probe->ftp_id);
993 ASSERT(MUTEX_HELD(&cpu_lock));
997 * Increment the count of enabled probes on this probe's provider;
998 * the provider can't go away while the probe still exists. We
999 * must increment this even if we aren't able to properly enable
1002 mutex_enter(&probe->ftp_prov->ftp_mtx);
1003 probe->ftp_prov->ftp_rcount++;
1004 mutex_exit(&probe->ftp_prov->ftp_mtx);
1007 * If this probe's provider is retired (meaning it was valid in a
1008 * previously exec'ed incarnation of this address space), bail out. The
1009 * provider can't go away while we're in this code path.
1011 if (probe->ftp_prov->ftp_retired)
1015 * If we can't find the process, it may be that we're in the context of
1016 * a fork in which the traced process is being born and we're copying
1017 * USDT probes. Otherwise, the process is gone so bail.
1020 if ((p = sprlock(probe->ftp_pid)) == NULL) {
1021 if ((curproc->p_flag & SFORKING) == 0)
1024 mutex_enter(&pidlock);
1025 p = prfind(probe->ftp_pid);
1028 * Confirm that curproc is indeed forking the process in which
1029 * we're trying to enable probes.
1032 ASSERT(p->p_parent == curproc);
1033 ASSERT(p->p_stat == SIDL);
1035 mutex_enter(&p->p_lock);
1036 mutex_exit(&pidlock);
1041 ASSERT(!(p->p_flag & SVFORK));
1042 mutex_exit(&p->p_lock);
1044 if ((p = pfind(probe->ftp_pid)) == NULL)
1049 * We have to enable the trap entry point before any user threads have
1050 * the chance to execute the trap instruction we're about to place
1051 * in their process's text.
1055 * pfind() returns a locked process.
1060 fasttrap_enable_callbacks();
1063 * Enable all the tracepoints and add this probe's id to each
1064 * tracepoint's list of active probes.
1066 for (i = 0; i < probe->ftp_ntps; i++) {
1067 if ((rc = fasttrap_tracepoint_enable(p, probe, i)) != 0) {
1069 * If enabling the tracepoint failed completely,
1070 * we don't have to disable it; if the failure
1071 * was only partial we must disable it.
1073 if (rc == FASTTRAP_ENABLE_FAIL)
1076 ASSERT(rc == FASTTRAP_ENABLE_PARTIAL);
1079 * Back up and pull out all the tracepoints we've
1080 * created so far for this probe.
1083 fasttrap_tracepoint_disable(p, probe, i);
1088 mutex_enter(&p->p_lock);
1095 * Since we're not actually enabling this probe,
1096 * drop our reference on the trap table entry.
1098 fasttrap_disable_callbacks();
1103 mutex_enter(&p->p_lock);
1109 probe->ftp_enabled = 1;
1114 fasttrap_pid_disable(void *arg, dtrace_id_t id, void *parg)
1116 fasttrap_probe_t *probe = parg;
1117 fasttrap_provider_t *provider = probe->ftp_prov;
1121 ASSERT(id == probe->ftp_id);
1123 mutex_enter(&provider->ftp_mtx);
1126 * We won't be able to acquire a /proc-esque lock on the process
1127 * iff the process is dead and gone. In this case, we rely on the
1128 * provider lock as a point of mutual exclusion to prevent other
1129 * DTrace consumers from disabling this probe.
1131 if ((p = pfind(probe->ftp_pid)) != NULL) {
1139 * Disable all the associated tracepoints (for fully enabled probes).
1141 if (probe->ftp_enabled) {
1142 for (i = 0; i < probe->ftp_ntps; i++) {
1143 fasttrap_tracepoint_disable(p, probe, i);
1147 ASSERT(provider->ftp_rcount > 0);
1148 provider->ftp_rcount--;
1152 * Even though we may not be able to remove it entirely, we
1153 * mark this retired provider to get a chance to remove some
1154 * of the associated probes.
1156 if (provider->ftp_retired && !provider->ftp_marked)
1157 whack = provider->ftp_marked = 1;
1158 mutex_exit(&provider->ftp_mtx);
1161 * If the process is dead, we're just waiting for the
1162 * last probe to be disabled to be able to free it.
1164 if (provider->ftp_rcount == 0 && !provider->ftp_marked)
1165 whack = provider->ftp_marked = 1;
1166 mutex_exit(&provider->ftp_mtx);
1170 fasttrap_pid_cleanup();
1176 if (!probe->ftp_enabled)
1179 probe->ftp_enabled = 0;
1182 ASSERT(MUTEX_HELD(&cpu_lock));
1184 fasttrap_disable_callbacks();
1189 fasttrap_pid_getargdesc(void *arg, dtrace_id_t id, void *parg,
1190 dtrace_argdesc_t *desc)
1192 fasttrap_probe_t *probe = parg;
1196 desc->dtargd_native[0] = '\0';
1197 desc->dtargd_xlate[0] = '\0';
1199 if (probe->ftp_prov->ftp_retired != 0 ||
1200 desc->dtargd_ndx >= probe->ftp_nargs) {
1201 desc->dtargd_ndx = DTRACE_ARGNONE;
1205 ndx = (probe->ftp_argmap != NULL) ?
1206 probe->ftp_argmap[desc->dtargd_ndx] : desc->dtargd_ndx;
1208 str = probe->ftp_ntypes;
1209 for (i = 0; i < ndx; i++) {
1210 str += strlen(str) + 1;
1213 ASSERT(strlen(str + 1) < sizeof (desc->dtargd_native));
1214 (void) strcpy(desc->dtargd_native, str);
1216 if (probe->ftp_xtypes == NULL)
1219 str = probe->ftp_xtypes;
1220 for (i = 0; i < desc->dtargd_ndx; i++) {
1221 str += strlen(str) + 1;
1224 ASSERT(strlen(str + 1) < sizeof (desc->dtargd_xlate));
1225 (void) strcpy(desc->dtargd_xlate, str);
1230 fasttrap_pid_destroy(void *arg, dtrace_id_t id, void *parg)
1232 fasttrap_probe_t *probe = parg;
1236 ASSERT(probe != NULL);
1237 ASSERT(!probe->ftp_enabled);
1238 ASSERT(fasttrap_total >= probe->ftp_ntps);
1240 atomic_add_32(&fasttrap_total, -probe->ftp_ntps);
1241 size = offsetof(fasttrap_probe_t, ftp_tps[probe->ftp_ntps]);
1243 if (probe->ftp_gen + 1 >= fasttrap_mod_gen)
1244 fasttrap_mod_barrier(probe->ftp_gen);
1246 for (i = 0; i < probe->ftp_ntps; i++) {
1247 kmem_free(probe->ftp_tps[i].fit_tp,
1248 sizeof (fasttrap_tracepoint_t));
1251 kmem_free(probe, size);
1255 static const dtrace_pattr_t pid_attr = {
1256 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
1257 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
1258 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
1259 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
1260 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
1263 static dtrace_pops_t pid_pops = {
1264 fasttrap_pid_provide,
1266 fasttrap_pid_enable,
1267 fasttrap_pid_disable,
1270 fasttrap_pid_getargdesc,
1271 fasttrap_pid_getarg,
1273 fasttrap_pid_destroy
1276 static dtrace_pops_t usdt_pops = {
1277 fasttrap_pid_provide,
1279 fasttrap_pid_enable,
1280 fasttrap_pid_disable,
1283 fasttrap_pid_getargdesc,
1284 fasttrap_usdt_getarg,
1286 fasttrap_pid_destroy
1289 static fasttrap_proc_t *
1290 fasttrap_proc_lookup(pid_t pid)
1292 fasttrap_bucket_t *bucket;
1293 fasttrap_proc_t *fprc, *new_fprc;
1296 bucket = &fasttrap_procs.fth_table[FASTTRAP_PROCS_INDEX(pid)];
1297 mutex_enter(&bucket->ftb_mtx);
1299 for (fprc = bucket->ftb_data; fprc != NULL; fprc = fprc->ftpc_next) {
1300 if (fprc->ftpc_pid == pid && fprc->ftpc_acount != 0) {
1301 mutex_enter(&fprc->ftpc_mtx);
1302 mutex_exit(&bucket->ftb_mtx);
1303 fprc->ftpc_rcount++;
1304 atomic_add_64(&fprc->ftpc_acount, 1);
1305 ASSERT(fprc->ftpc_acount <= fprc->ftpc_rcount);
1306 mutex_exit(&fprc->ftpc_mtx);
1313 * Drop the bucket lock so we don't try to perform a sleeping
1314 * allocation under it.
1316 mutex_exit(&bucket->ftb_mtx);
1318 new_fprc = kmem_zalloc(sizeof (fasttrap_proc_t), KM_SLEEP);
1319 new_fprc->ftpc_pid = pid;
1320 new_fprc->ftpc_rcount = 1;
1321 new_fprc->ftpc_acount = 1;
1323 mutex_init(&new_fprc->ftpc_mtx, "fasttrap proc mtx", MUTEX_DEFAULT,
1327 mutex_enter(&bucket->ftb_mtx);
1330 * Take another lap through the list to make sure a proc hasn't
1331 * been created for this pid while we weren't under the bucket lock.
1333 for (fprc = bucket->ftb_data; fprc != NULL; fprc = fprc->ftpc_next) {
1334 if (fprc->ftpc_pid == pid && fprc->ftpc_acount != 0) {
1335 mutex_enter(&fprc->ftpc_mtx);
1336 mutex_exit(&bucket->ftb_mtx);
1337 fprc->ftpc_rcount++;
1338 atomic_add_64(&fprc->ftpc_acount, 1);
1339 ASSERT(fprc->ftpc_acount <= fprc->ftpc_rcount);
1340 mutex_exit(&fprc->ftpc_mtx);
1342 kmem_free(new_fprc, sizeof (fasttrap_proc_t));
1348 new_fprc->ftpc_next = bucket->ftb_data;
1349 bucket->ftb_data = new_fprc;
1351 mutex_exit(&bucket->ftb_mtx);
1357 fasttrap_proc_release(fasttrap_proc_t *proc)
1359 fasttrap_bucket_t *bucket;
1360 fasttrap_proc_t *fprc, **fprcp;
1361 pid_t pid = proc->ftpc_pid;
1363 mutex_enter(&proc->ftpc_mtx);
1365 ASSERT(proc->ftpc_rcount != 0);
1366 ASSERT(proc->ftpc_acount <= proc->ftpc_rcount);
1368 if (--proc->ftpc_rcount != 0) {
1369 mutex_exit(&proc->ftpc_mtx);
1373 mutex_exit(&proc->ftpc_mtx);
1376 * There should definitely be no live providers associated with this
1377 * process at this point.
1379 ASSERT(proc->ftpc_acount == 0);
1381 bucket = &fasttrap_procs.fth_table[FASTTRAP_PROCS_INDEX(pid)];
1382 mutex_enter(&bucket->ftb_mtx);
1384 fprcp = (fasttrap_proc_t **)&bucket->ftb_data;
1385 while ((fprc = *fprcp) != NULL) {
1389 fprcp = &fprc->ftpc_next;
1393 * Something strange has happened if we can't find the proc.
1395 ASSERT(fprc != NULL);
1397 *fprcp = fprc->ftpc_next;
1399 mutex_exit(&bucket->ftb_mtx);
1401 kmem_free(fprc, sizeof (fasttrap_proc_t));
1405 * Lookup a fasttrap-managed provider based on its name and associated pid.
1406 * If the pattr argument is non-NULL, this function instantiates the provider
1407 * if it doesn't exist otherwise it returns NULL. The provider is returned
1408 * with its lock held.
1410 static fasttrap_provider_t *
1411 fasttrap_provider_lookup(pid_t pid, const char *name,
1412 const dtrace_pattr_t *pattr)
1414 fasttrap_provider_t *fp, *new_fp = NULL;
1415 fasttrap_bucket_t *bucket;
1416 char provname[DTRACE_PROVNAMELEN];
1420 ASSERT(strlen(name) < sizeof (fp->ftp_name));
1421 ASSERT(pattr != NULL);
1423 bucket = &fasttrap_provs.fth_table[FASTTRAP_PROVS_INDEX(pid, name)];
1424 mutex_enter(&bucket->ftb_mtx);
1427 * Take a lap through the list and return the match if we find it.
1429 for (fp = bucket->ftb_data; fp != NULL; fp = fp->ftp_next) {
1430 if (fp->ftp_pid == pid && strcmp(fp->ftp_name, name) == 0 &&
1432 mutex_enter(&fp->ftp_mtx);
1433 mutex_exit(&bucket->ftb_mtx);
1439 * Drop the bucket lock so we don't try to perform a sleeping
1440 * allocation under it.
1442 mutex_exit(&bucket->ftb_mtx);
1445 * Make sure the process exists, isn't a child created as the result
1446 * of a vfork(2), and isn't a zombie (but may be in fork).
1448 if ((p = pfind(pid)) == NULL)
1452 * Increment p_dtrace_probes so that the process knows to inform us
1453 * when it exits or execs. fasttrap_provider_free() decrements this
1454 * when we're done with this provider.
1456 p->p_dtrace_probes++;
1459 * Grab the credentials for this process so we have
1460 * something to pass to dtrace_register().
1462 PROC_LOCK_ASSERT(p, MA_OWNED);
1467 new_fp = kmem_zalloc(sizeof (fasttrap_provider_t), KM_SLEEP);
1468 new_fp->ftp_pid = pid;
1469 new_fp->ftp_proc = fasttrap_proc_lookup(pid);
1471 mutex_init(&new_fp->ftp_mtx, "provider mtx", MUTEX_DEFAULT, NULL);
1472 mutex_init(&new_fp->ftp_cmtx, "lock on creating", MUTEX_DEFAULT, NULL);
1475 ASSERT(new_fp->ftp_proc != NULL);
1477 mutex_enter(&bucket->ftb_mtx);
1480 * Take another lap through the list to make sure a provider hasn't
1481 * been created for this pid while we weren't under the bucket lock.
1483 for (fp = bucket->ftb_data; fp != NULL; fp = fp->ftp_next) {
1484 if (fp->ftp_pid == pid && strcmp(fp->ftp_name, name) == 0 &&
1486 mutex_enter(&fp->ftp_mtx);
1487 mutex_exit(&bucket->ftb_mtx);
1488 fasttrap_provider_free(new_fp);
1494 (void) strcpy(new_fp->ftp_name, name);
1497 * Fail and return NULL if either the provider name is too long
1498 * or we fail to register this new provider with the DTrace
1499 * framework. Note that this is the only place we ever construct
1500 * the full provider name -- we keep it in pieces in the provider
1503 if (snprintf(provname, sizeof (provname), "%s%u", name, (uint_t)pid) >=
1504 sizeof (provname) ||
1505 dtrace_register(provname, pattr,
1506 DTRACE_PRIV_PROC | DTRACE_PRIV_OWNER | DTRACE_PRIV_ZONEOWNER, cred,
1507 pattr == &pid_attr ? &pid_pops : &usdt_pops, new_fp,
1508 &new_fp->ftp_provid) != 0) {
1509 mutex_exit(&bucket->ftb_mtx);
1510 fasttrap_provider_free(new_fp);
1515 new_fp->ftp_next = bucket->ftb_data;
1516 bucket->ftb_data = new_fp;
1518 mutex_enter(&new_fp->ftp_mtx);
1519 mutex_exit(&bucket->ftb_mtx);
1526 fasttrap_provider_free(fasttrap_provider_t *provider)
1528 pid_t pid = provider->ftp_pid;
1532 * There need to be no associated enabled probes, no consumers
1533 * creating probes, and no meta providers referencing this provider.
1535 ASSERT(provider->ftp_rcount == 0);
1536 ASSERT(provider->ftp_ccount == 0);
1537 ASSERT(provider->ftp_mcount == 0);
1540 * If this provider hasn't been retired, we need to explicitly drop the
1541 * count of active providers on the associated process structure.
1543 if (!provider->ftp_retired) {
1544 atomic_add_64(&provider->ftp_proc->ftpc_acount, -1);
1545 ASSERT(provider->ftp_proc->ftpc_acount <
1546 provider->ftp_proc->ftpc_rcount);
1549 fasttrap_proc_release(provider->ftp_proc);
1552 mutex_destroy(&provider->ftp_mtx);
1553 mutex_destroy(&provider->ftp_cmtx);
1555 kmem_free(provider, sizeof (fasttrap_provider_t));
1558 * Decrement p_dtrace_probes on the process whose provider we're
1559 * freeing. We don't have to worry about clobbering somone else's
1560 * modifications to it because we have locked the bucket that
1561 * corresponds to this process's hash chain in the provider hash
1562 * table. Don't sweat it if we can't find the process.
1564 if ((p = pfind(pid)) == NULL) {
1568 p->p_dtrace_probes--;
1575 fasttrap_provider_retire(pid_t pid, const char *name, int mprov)
1577 fasttrap_provider_t *fp;
1578 fasttrap_bucket_t *bucket;
1579 dtrace_provider_id_t provid;
1581 ASSERT(strlen(name) < sizeof (fp->ftp_name));
1583 bucket = &fasttrap_provs.fth_table[FASTTRAP_PROVS_INDEX(pid, name)];
1584 mutex_enter(&bucket->ftb_mtx);
1586 for (fp = bucket->ftb_data; fp != NULL; fp = fp->ftp_next) {
1587 if (fp->ftp_pid == pid && strcmp(fp->ftp_name, name) == 0 &&
1593 mutex_exit(&bucket->ftb_mtx);
1597 mutex_enter(&fp->ftp_mtx);
1598 ASSERT(!mprov || fp->ftp_mcount > 0);
1599 if (mprov && --fp->ftp_mcount != 0) {
1600 mutex_exit(&fp->ftp_mtx);
1601 mutex_exit(&bucket->ftb_mtx);
1606 * Mark the provider to be removed in our post-processing step, mark it
1607 * retired, and drop the active count on its proc. Marking it indicates
1608 * that we should try to remove it; setting the retired flag indicates
1609 * that we're done with this provider; dropping the active the proc
1610 * releases our hold, and when this reaches zero (as it will during
1611 * exit or exec) the proc and associated providers become defunct.
1613 * We obviously need to take the bucket lock before the provider lock
1614 * to perform the lookup, but we need to drop the provider lock
1615 * before calling into the DTrace framework since we acquire the
1616 * provider lock in callbacks invoked from the DTrace framework. The
1617 * bucket lock therefore protects the integrity of the provider hash
1620 atomic_add_64(&fp->ftp_proc->ftpc_acount, -1);
1621 ASSERT(fp->ftp_proc->ftpc_acount < fp->ftp_proc->ftpc_rcount);
1623 fp->ftp_retired = 1;
1625 provid = fp->ftp_provid;
1626 mutex_exit(&fp->ftp_mtx);
1629 * We don't have to worry about invalidating the same provider twice
1630 * since fasttrap_provider_lookup() will ignore provider that have
1631 * been marked as retired.
1633 dtrace_invalidate(provid);
1635 mutex_exit(&bucket->ftb_mtx);
1637 fasttrap_pid_cleanup();
1641 fasttrap_uint32_cmp(const void *ap, const void *bp)
1643 return (*(const uint32_t *)ap - *(const uint32_t *)bp);
1647 fasttrap_uint64_cmp(const void *ap, const void *bp)
1649 return (*(const uint64_t *)ap - *(const uint64_t *)bp);
1653 fasttrap_add_probe(fasttrap_probe_spec_t *pdata)
1655 fasttrap_provider_t *provider;
1656 fasttrap_probe_t *pp;
1657 fasttrap_tracepoint_t *tp;
1659 int i, aframes = 0, whack;
1662 * There needs to be at least one desired trace point.
1664 if (pdata->ftps_noffs == 0)
1667 switch (pdata->ftps_type) {
1670 aframes = FASTTRAP_ENTRY_AFRAMES;
1674 aframes = FASTTRAP_RETURN_AFRAMES;
1683 if ((provider = fasttrap_provider_lookup(pdata->ftps_pid,
1684 FASTTRAP_PID_NAME, &pid_attr)) == NULL)
1688 * Increment this reference count to indicate that a consumer is
1689 * actively adding a new probe associated with this provider. This
1690 * prevents the provider from being deleted -- we'll need to check
1691 * for pending deletions when we drop this reference count.
1693 provider->ftp_ccount++;
1694 mutex_exit(&provider->ftp_mtx);
1697 * Grab the creation lock to ensure consistency between calls to
1698 * dtrace_probe_lookup() and dtrace_probe_create() in the face of
1699 * other threads creating probes. We must drop the provider lock
1700 * before taking this lock to avoid a three-way deadlock with the
1703 mutex_enter(&provider->ftp_cmtx);
1706 for (i = 0; i < pdata->ftps_noffs; i++) {
1709 (void) sprintf(name_str, "%llx",
1710 (unsigned long long)pdata->ftps_offs[i]);
1712 if (dtrace_probe_lookup(provider->ftp_provid,
1713 pdata->ftps_mod, pdata->ftps_func, name_str) != 0)
1716 atomic_add_32(&fasttrap_total, 1);
1718 if (fasttrap_total > fasttrap_max) {
1719 atomic_add_32(&fasttrap_total, -1);
1723 pp = kmem_zalloc(sizeof (fasttrap_probe_t), KM_SLEEP);
1725 pp->ftp_prov = provider;
1726 pp->ftp_faddr = pdata->ftps_pc;
1727 pp->ftp_fsize = pdata->ftps_size;
1728 pp->ftp_pid = pdata->ftps_pid;
1731 tp = kmem_zalloc(sizeof (fasttrap_tracepoint_t),
1734 tp->ftt_proc = provider->ftp_proc;
1735 tp->ftt_pc = pdata->ftps_offs[i] + pdata->ftps_pc;
1736 tp->ftt_pid = pdata->ftps_pid;
1738 pp->ftp_tps[0].fit_tp = tp;
1739 pp->ftp_tps[0].fit_id.fti_probe = pp;
1740 pp->ftp_tps[0].fit_id.fti_ptype = pdata->ftps_type;
1742 pp->ftp_id = dtrace_probe_create(provider->ftp_provid,
1743 pdata->ftps_mod, pdata->ftps_func, name_str,
1744 FASTTRAP_OFFSET_AFRAMES, pp);
1747 } else if (dtrace_probe_lookup(provider->ftp_provid, pdata->ftps_mod,
1748 pdata->ftps_func, name) == 0) {
1749 atomic_add_32(&fasttrap_total, pdata->ftps_noffs);
1751 if (fasttrap_total > fasttrap_max) {
1752 atomic_add_32(&fasttrap_total, -pdata->ftps_noffs);
1757 * Make sure all tracepoint program counter values are unique.
1758 * We later assume that each probe has exactly one tracepoint
1761 qsort(pdata->ftps_offs, pdata->ftps_noffs,
1762 sizeof (uint64_t), fasttrap_uint64_cmp);
1763 for (i = 1; i < pdata->ftps_noffs; i++) {
1764 if (pdata->ftps_offs[i] > pdata->ftps_offs[i - 1])
1767 atomic_add_32(&fasttrap_total, -pdata->ftps_noffs);
1771 ASSERT(pdata->ftps_noffs > 0);
1772 pp = kmem_zalloc(offsetof(fasttrap_probe_t,
1773 ftp_tps[pdata->ftps_noffs]), KM_SLEEP);
1775 pp->ftp_prov = provider;
1776 pp->ftp_faddr = pdata->ftps_pc;
1777 pp->ftp_fsize = pdata->ftps_size;
1778 pp->ftp_pid = pdata->ftps_pid;
1779 pp->ftp_ntps = pdata->ftps_noffs;
1781 for (i = 0; i < pdata->ftps_noffs; i++) {
1782 tp = kmem_zalloc(sizeof (fasttrap_tracepoint_t),
1785 tp->ftt_proc = provider->ftp_proc;
1786 tp->ftt_pc = pdata->ftps_offs[i] + pdata->ftps_pc;
1787 tp->ftt_pid = pdata->ftps_pid;
1789 pp->ftp_tps[i].fit_tp = tp;
1790 pp->ftp_tps[i].fit_id.fti_probe = pp;
1791 pp->ftp_tps[i].fit_id.fti_ptype = pdata->ftps_type;
1794 pp->ftp_id = dtrace_probe_create(provider->ftp_provid,
1795 pdata->ftps_mod, pdata->ftps_func, name, aframes, pp);
1798 mutex_exit(&provider->ftp_cmtx);
1801 * We know that the provider is still valid since we incremented the
1802 * creation reference count. If someone tried to clean up this provider
1803 * while we were using it (e.g. because the process called exec(2) or
1804 * exit(2)), take note of that and try to clean it up now.
1806 mutex_enter(&provider->ftp_mtx);
1807 provider->ftp_ccount--;
1808 whack = provider->ftp_retired;
1809 mutex_exit(&provider->ftp_mtx);
1812 fasttrap_pid_cleanup();
1818 * If we've exhausted the allowable resources, we'll try to remove
1819 * this provider to free some up. This is to cover the case where
1820 * the user has accidentally created many more probes than was
1821 * intended (e.g. pid123:::).
1823 mutex_exit(&provider->ftp_cmtx);
1824 mutex_enter(&provider->ftp_mtx);
1825 provider->ftp_ccount--;
1826 provider->ftp_marked = 1;
1827 mutex_exit(&provider->ftp_mtx);
1829 fasttrap_pid_cleanup();
1836 fasttrap_meta_provide(void *arg, dtrace_helper_provdesc_t *dhpv, pid_t pid)
1838 fasttrap_provider_t *provider;
1841 * A 32-bit unsigned integer (like a pid for example) can be
1842 * expressed in 10 or fewer decimal digits. Make sure that we'll
1843 * have enough space for the provider name.
1845 if (strlen(dhpv->dthpv_provname) + 10 >=
1846 sizeof (provider->ftp_name)) {
1847 printf("failed to instantiate provider %s: "
1848 "name too long to accomodate pid", dhpv->dthpv_provname);
1853 * Don't let folks spoof the true pid provider.
1855 if (strcmp(dhpv->dthpv_provname, FASTTRAP_PID_NAME) == 0) {
1856 printf("failed to instantiate provider %s: "
1857 "%s is an invalid name", dhpv->dthpv_provname,
1863 * The highest stability class that fasttrap supports is ISA; cap
1864 * the stability of the new provider accordingly.
1866 if (dhpv->dthpv_pattr.dtpa_provider.dtat_class > DTRACE_CLASS_ISA)
1867 dhpv->dthpv_pattr.dtpa_provider.dtat_class = DTRACE_CLASS_ISA;
1868 if (dhpv->dthpv_pattr.dtpa_mod.dtat_class > DTRACE_CLASS_ISA)
1869 dhpv->dthpv_pattr.dtpa_mod.dtat_class = DTRACE_CLASS_ISA;
1870 if (dhpv->dthpv_pattr.dtpa_func.dtat_class > DTRACE_CLASS_ISA)
1871 dhpv->dthpv_pattr.dtpa_func.dtat_class = DTRACE_CLASS_ISA;
1872 if (dhpv->dthpv_pattr.dtpa_name.dtat_class > DTRACE_CLASS_ISA)
1873 dhpv->dthpv_pattr.dtpa_name.dtat_class = DTRACE_CLASS_ISA;
1874 if (dhpv->dthpv_pattr.dtpa_args.dtat_class > DTRACE_CLASS_ISA)
1875 dhpv->dthpv_pattr.dtpa_args.dtat_class = DTRACE_CLASS_ISA;
1877 if ((provider = fasttrap_provider_lookup(pid, dhpv->dthpv_provname,
1878 &dhpv->dthpv_pattr)) == NULL) {
1879 printf("failed to instantiate provider %s for "
1880 "process %u", dhpv->dthpv_provname, (uint_t)pid);
1885 * Up the meta provider count so this provider isn't removed until
1886 * the meta provider has been told to remove it.
1888 provider->ftp_mcount++;
1890 mutex_exit(&provider->ftp_mtx);
1897 fasttrap_meta_create_probe(void *arg, void *parg,
1898 dtrace_helper_probedesc_t *dhpb)
1900 fasttrap_provider_t *provider = parg;
1901 fasttrap_probe_t *pp;
1902 fasttrap_tracepoint_t *tp;
1907 * Since the meta provider count is non-zero we don't have to worry
1908 * about this provider disappearing.
1910 ASSERT(provider->ftp_mcount > 0);
1913 * The offsets must be unique.
1915 qsort(dhpb->dthpb_offs, dhpb->dthpb_noffs, sizeof (uint32_t),
1916 fasttrap_uint32_cmp);
1917 for (i = 1; i < dhpb->dthpb_noffs; i++) {
1918 if (dhpb->dthpb_base + dhpb->dthpb_offs[i] <=
1919 dhpb->dthpb_base + dhpb->dthpb_offs[i - 1])
1923 qsort(dhpb->dthpb_enoffs, dhpb->dthpb_nenoffs, sizeof (uint32_t),
1924 fasttrap_uint32_cmp);
1925 for (i = 1; i < dhpb->dthpb_nenoffs; i++) {
1926 if (dhpb->dthpb_base + dhpb->dthpb_enoffs[i] <=
1927 dhpb->dthpb_base + dhpb->dthpb_enoffs[i - 1])
1932 * Grab the creation lock to ensure consistency between calls to
1933 * dtrace_probe_lookup() and dtrace_probe_create() in the face of
1934 * other threads creating probes.
1936 mutex_enter(&provider->ftp_cmtx);
1938 if (dtrace_probe_lookup(provider->ftp_provid, dhpb->dthpb_mod,
1939 dhpb->dthpb_func, dhpb->dthpb_name) != 0) {
1940 mutex_exit(&provider->ftp_cmtx);
1944 ntps = dhpb->dthpb_noffs + dhpb->dthpb_nenoffs;
1947 atomic_add_32(&fasttrap_total, ntps);
1949 if (fasttrap_total > fasttrap_max) {
1950 atomic_add_32(&fasttrap_total, -ntps);
1951 mutex_exit(&provider->ftp_cmtx);
1955 pp = kmem_zalloc(offsetof(fasttrap_probe_t, ftp_tps[ntps]), KM_SLEEP);
1957 pp->ftp_prov = provider;
1958 pp->ftp_pid = provider->ftp_pid;
1959 pp->ftp_ntps = ntps;
1960 pp->ftp_nargs = dhpb->dthpb_xargc;
1961 pp->ftp_xtypes = dhpb->dthpb_xtypes;
1962 pp->ftp_ntypes = dhpb->dthpb_ntypes;
1965 * First create a tracepoint for each actual point of interest.
1967 for (i = 0; i < dhpb->dthpb_noffs; i++) {
1968 tp = kmem_zalloc(sizeof (fasttrap_tracepoint_t), KM_SLEEP);
1970 tp->ftt_proc = provider->ftp_proc;
1971 tp->ftt_pc = dhpb->dthpb_base + dhpb->dthpb_offs[i];
1972 tp->ftt_pid = provider->ftp_pid;
1974 pp->ftp_tps[i].fit_tp = tp;
1975 pp->ftp_tps[i].fit_id.fti_probe = pp;
1977 pp->ftp_tps[i].fit_id.fti_ptype = DTFTP_POST_OFFSETS;
1979 pp->ftp_tps[i].fit_id.fti_ptype = DTFTP_OFFSETS;
1984 * Then create a tracepoint for each is-enabled point.
1986 for (j = 0; i < ntps; i++, j++) {
1987 tp = kmem_zalloc(sizeof (fasttrap_tracepoint_t), KM_SLEEP);
1989 tp->ftt_proc = provider->ftp_proc;
1990 tp->ftt_pc = dhpb->dthpb_base + dhpb->dthpb_enoffs[j];
1991 tp->ftt_pid = provider->ftp_pid;
1993 pp->ftp_tps[i].fit_tp = tp;
1994 pp->ftp_tps[i].fit_id.fti_probe = pp;
1995 pp->ftp_tps[i].fit_id.fti_ptype = DTFTP_IS_ENABLED;
1999 * If the arguments are shuffled around we set the argument remapping
2000 * table. Later, when the probe fires, we only remap the arguments
2001 * if the table is non-NULL.
2003 for (i = 0; i < dhpb->dthpb_xargc; i++) {
2004 if (dhpb->dthpb_args[i] != i) {
2005 pp->ftp_argmap = dhpb->dthpb_args;
2011 * The probe is fully constructed -- register it with DTrace.
2013 pp->ftp_id = dtrace_probe_create(provider->ftp_provid, dhpb->dthpb_mod,
2014 dhpb->dthpb_func, dhpb->dthpb_name, FASTTRAP_OFFSET_AFRAMES, pp);
2016 mutex_exit(&provider->ftp_cmtx);
2021 fasttrap_meta_remove(void *arg, dtrace_helper_provdesc_t *dhpv, pid_t pid)
2024 * Clean up the USDT provider. There may be active consumers of the
2025 * provider busy adding probes, no damage will actually befall the
2026 * provider until that count has dropped to zero. This just puts
2027 * the provider on death row.
2029 fasttrap_provider_retire(pid, dhpv->dthpv_provname, 1);
2032 static dtrace_mops_t fasttrap_mops = {
2033 fasttrap_meta_create_probe,
2034 fasttrap_meta_provide,
2035 fasttrap_meta_remove
2040 fasttrap_open(struct cdev *dev __unused, int oflags __unused,
2041 int devtype __unused, struct thread *td __unused)
2048 fasttrap_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int fflag,
2052 struct kinfo_proc kp;
2053 const cred_t *cr = td->td_ucred;
2055 if (!dtrace_attached())
2058 if (cmd == FASTTRAPIOC_MAKEPROBE) {
2059 fasttrap_probe_spec_t *uprobe = *(fasttrap_probe_spec_t **)arg;
2060 fasttrap_probe_spec_t *probe;
2066 if (copyin(&uprobe->ftps_noffs, &noffs,
2067 sizeof (uprobe->ftps_noffs)))
2071 * Probes must have at least one tracepoint.
2076 size = sizeof (fasttrap_probe_spec_t) +
2077 sizeof (probe->ftps_offs[0]) * (noffs - 1);
2079 if (size > 1024 * 1024)
2082 probe = kmem_alloc(size, KM_SLEEP);
2084 if (copyin(uprobe, probe, size) != 0) {
2085 kmem_free(probe, size);
2090 * Verify that the function and module strings contain no
2093 for (c = &probe->ftps_func[0]; *c != '\0'; c++) {
2094 if (*c < 0x20 || 0x7f <= *c) {
2100 for (c = &probe->ftps_mod[0]; *c != '\0'; c++) {
2101 if (*c < 0x20 || 0x7f <= *c) {
2108 if (!PRIV_POLICY_CHOICE(cr, PRIV_ALL, B_FALSE)) {
2110 pid_t pid = probe->ftps_pid;
2113 mutex_enter(&pidlock);
2116 * Report an error if the process doesn't exist
2117 * or is actively being birthed.
2121 fill_kinfo_proc(p, &kp);
2122 if (p == NULL || kp.ki_stat == SIDL) {
2124 mutex_exit(&pidlock);
2129 mutex_enter(&p->p_lock);
2130 mutex_exit(&pidlock);
2132 PROC_LOCK_ASSERT(p, MA_OWNED);
2136 if ((ret = priv_proc_cred_perm(cr, p, NULL,
2137 VREAD | VWRITE)) != 0) {
2139 mutex_exit(&p->p_lock);
2147 mutex_exit(&p->p_lock);
2154 ret = fasttrap_add_probe(probe);
2156 kmem_free(probe, size);
2160 } else if (cmd == FASTTRAPIOC_GETINSTR) {
2161 fasttrap_instr_query_t instr;
2162 fasttrap_tracepoint_t *tp;
2169 if (copyin((void *)arg, &instr, sizeof (instr)) != 0)
2174 if (!PRIV_POLICY_CHOICE(cr, PRIV_ALL, B_FALSE)) {
2176 pid_t pid = instr.ftiq_pid;
2179 mutex_enter(&pidlock);
2182 * Report an error if the process doesn't exist
2183 * or is actively being birthed.
2187 fill_kinfo_proc(p, &kp);
2188 if (p == NULL || kp.ki_stat == SIDL) {
2190 mutex_exit(&pidlock);
2195 mutex_enter(&p->p_lock);
2196 mutex_exit(&pidlock);
2198 PROC_LOCK_ASSERT(p, MA_OWNED);
2202 if ((ret = priv_proc_cred_perm(cr, p, NULL,
2205 mutex_exit(&p->p_lock);
2214 mutex_exit(&p->p_lock);
2221 index = FASTTRAP_TPOINTS_INDEX(instr.ftiq_pid, instr.ftiq_pc);
2223 mutex_enter(&fasttrap_tpoints.fth_table[index].ftb_mtx);
2224 tp = fasttrap_tpoints.fth_table[index].ftb_data;
2225 while (tp != NULL) {
2226 if (instr.ftiq_pid == tp->ftt_pid &&
2227 instr.ftiq_pc == tp->ftt_pc &&
2228 tp->ftt_proc->ftpc_acount != 0)
2235 mutex_exit(&fasttrap_tpoints.fth_table[index].ftb_mtx);
2239 bcopy(&tp->ftt_instr, &instr.ftiq_instr,
2240 sizeof (instr.ftiq_instr));
2241 mutex_exit(&fasttrap_tpoints.fth_table[index].ftb_mtx);
2243 if (copyout(&instr, (void *)arg, sizeof (instr)) != 0)
2258 /* Create the /dev/dtrace/fasttrap entry. */
2259 fasttrap_cdev = make_dev(&fasttrap_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
2262 mtx_init(&fasttrap_cleanup_mtx, "fasttrap clean", "dtrace", MTX_DEF);
2263 mutex_init(&fasttrap_count_mtx, "fasttrap count mtx", MUTEX_DEFAULT,
2267 fasttrap_max = ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS,
2268 "fasttrap-max-probes", FASTTRAP_MAX_DEFAULT);
2270 fasttrap_max = FASTTRAP_MAX_DEFAULT;
2275 * Conjure up the tracepoints hashtable...
2278 nent = ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS,
2279 "fasttrap-hash-size", FASTTRAP_TPOINTS_DEFAULT_SIZE);
2281 nent = FASTTRAP_TPOINTS_DEFAULT_SIZE;
2284 if (nent == 0 || nent > 0x1000000)
2285 nent = FASTTRAP_TPOINTS_DEFAULT_SIZE;
2287 if ((nent & (nent - 1)) == 0)
2288 fasttrap_tpoints.fth_nent = nent;
2290 fasttrap_tpoints.fth_nent = 1 << fasttrap_highbit(nent);
2291 ASSERT(fasttrap_tpoints.fth_nent > 0);
2292 fasttrap_tpoints.fth_mask = fasttrap_tpoints.fth_nent - 1;
2293 fasttrap_tpoints.fth_table = kmem_zalloc(fasttrap_tpoints.fth_nent *
2294 sizeof (fasttrap_bucket_t), KM_SLEEP);
2296 for (i = 0; i < fasttrap_tpoints.fth_nent; i++)
2297 mutex_init(&fasttrap_tpoints.fth_table[i].ftb_mtx,
2298 "tracepoints bucket mtx", MUTEX_DEFAULT, NULL);
2302 * ... and the providers hash table...
2304 nent = FASTTRAP_PROVIDERS_DEFAULT_SIZE;
2305 if ((nent & (nent - 1)) == 0)
2306 fasttrap_provs.fth_nent = nent;
2308 fasttrap_provs.fth_nent = 1 << fasttrap_highbit(nent);
2309 ASSERT(fasttrap_provs.fth_nent > 0);
2310 fasttrap_provs.fth_mask = fasttrap_provs.fth_nent - 1;
2311 fasttrap_provs.fth_table = kmem_zalloc(fasttrap_provs.fth_nent *
2312 sizeof (fasttrap_bucket_t), KM_SLEEP);
2314 for (i = 0; i < fasttrap_provs.fth_nent; i++)
2315 mutex_init(&fasttrap_provs.fth_table[i].ftb_mtx,
2316 "providers bucket mtx", MUTEX_DEFAULT, NULL);
2319 ret = kproc_create(fasttrap_pid_cleanup_cb, NULL,
2320 &fasttrap_cleanup_proc, 0, 0, "ftcleanup");
2322 destroy_dev(fasttrap_cdev);
2324 for (i = 0; i < fasttrap_provs.fth_nent; i++)
2325 mutex_destroy(&fasttrap_provs.fth_table[i].ftb_mtx);
2326 for (i = 0; i < fasttrap_tpoints.fth_nent; i++)
2327 mutex_destroy(&fasttrap_tpoints.fth_table[i].ftb_mtx);
2329 kmem_free(fasttrap_provs.fth_table, fasttrap_provs.fth_nent *
2330 sizeof (fasttrap_bucket_t));
2331 mtx_destroy(&fasttrap_cleanup_mtx);
2332 mutex_destroy(&fasttrap_count_mtx);
2338 * ... and the procs hash table.
2340 nent = FASTTRAP_PROCS_DEFAULT_SIZE;
2341 if ((nent & (nent - 1)) == 0)
2342 fasttrap_procs.fth_nent = nent;
2344 fasttrap_procs.fth_nent = 1 << fasttrap_highbit(nent);
2345 ASSERT(fasttrap_procs.fth_nent > 0);
2346 fasttrap_procs.fth_mask = fasttrap_procs.fth_nent - 1;
2347 fasttrap_procs.fth_table = kmem_zalloc(fasttrap_procs.fth_nent *
2348 sizeof (fasttrap_bucket_t), KM_SLEEP);
2350 for (i = 0; i < fasttrap_procs.fth_nent; i++)
2351 mutex_init(&fasttrap_procs.fth_table[i].ftb_mtx,
2352 "processes bucket mtx", MUTEX_DEFAULT, NULL);
2355 mutex_init(&fasttrap_cpuc_pid_lock[i], "fasttrap barrier",
2356 MUTEX_DEFAULT, NULL);
2361 * Install our hooks into fork(2), exec(2), and exit(2).
2363 dtrace_fasttrap_fork = &fasttrap_fork;
2364 dtrace_fasttrap_exit = &fasttrap_exec_exit;
2365 dtrace_fasttrap_exec = &fasttrap_exec_exit;
2367 (void) dtrace_meta_register("fasttrap", &fasttrap_mops, NULL,
2374 fasttrap_unload(void)
2379 * Unregister the meta-provider to make sure no new fasttrap-
2380 * managed providers come along while we're trying to close up
2381 * shop. If we fail to detach, we'll need to re-register as a
2382 * meta-provider. We can fail to unregister as a meta-provider
2383 * if providers we manage still exist.
2385 if (fasttrap_meta_id != DTRACE_METAPROVNONE &&
2386 dtrace_meta_unregister(fasttrap_meta_id) != 0)
2390 * Iterate over all of our providers. If there's still a process
2391 * that corresponds to that pid, fail to detach.
2393 for (i = 0; i < fasttrap_provs.fth_nent; i++) {
2394 fasttrap_provider_t **fpp, *fp;
2395 fasttrap_bucket_t *bucket = &fasttrap_provs.fth_table[i];
2397 mutex_enter(&bucket->ftb_mtx);
2398 fpp = (fasttrap_provider_t **)&bucket->ftb_data;
2399 while ((fp = *fpp) != NULL) {
2401 * Acquire and release the lock as a simple way of
2402 * waiting for any other consumer to finish with
2403 * this provider. A thread must first acquire the
2404 * bucket lock so there's no chance of another thread
2405 * blocking on the provider's lock.
2407 mutex_enter(&fp->ftp_mtx);
2408 mutex_exit(&fp->ftp_mtx);
2410 if (dtrace_unregister(fp->ftp_provid) != 0) {
2412 fpp = &fp->ftp_next;
2414 *fpp = fp->ftp_next;
2415 fasttrap_provider_free(fp);
2419 mutex_exit(&bucket->ftb_mtx);
2423 (void) dtrace_meta_register("fasttrap", &fasttrap_mops, NULL,
2430 * Stop new processes from entering these hooks now, before the
2431 * fasttrap_cleanup thread runs. That way all processes will hopefully
2432 * be out of these hooks before we free fasttrap_provs.fth_table
2434 ASSERT(dtrace_fasttrap_fork == &fasttrap_fork);
2435 dtrace_fasttrap_fork = NULL;
2437 ASSERT(dtrace_fasttrap_exec == &fasttrap_exec_exit);
2438 dtrace_fasttrap_exec = NULL;
2440 ASSERT(dtrace_fasttrap_exit == &fasttrap_exec_exit);
2441 dtrace_fasttrap_exit = NULL;
2443 mtx_lock(&fasttrap_cleanup_mtx);
2444 fasttrap_cleanup_drain = 1;
2445 /* Wait for the cleanup thread to finish up and signal us. */
2446 wakeup(&fasttrap_cleanup_cv);
2447 mtx_sleep(&fasttrap_cleanup_drain, &fasttrap_cleanup_mtx, 0, "ftcld",
2449 fasttrap_cleanup_proc = NULL;
2450 mtx_destroy(&fasttrap_cleanup_mtx);
2453 mutex_enter(&fasttrap_count_mtx);
2454 ASSERT(fasttrap_pid_count == 0);
2455 mutex_exit(&fasttrap_count_mtx);
2459 for (i = 0; i < fasttrap_tpoints.fth_nent; i++)
2460 mutex_destroy(&fasttrap_tpoints.fth_table[i].ftb_mtx);
2461 for (i = 0; i < fasttrap_provs.fth_nent; i++)
2462 mutex_destroy(&fasttrap_provs.fth_table[i].ftb_mtx);
2463 for (i = 0; i < fasttrap_procs.fth_nent; i++)
2464 mutex_destroy(&fasttrap_procs.fth_table[i].ftb_mtx);
2466 kmem_free(fasttrap_tpoints.fth_table,
2467 fasttrap_tpoints.fth_nent * sizeof (fasttrap_bucket_t));
2468 fasttrap_tpoints.fth_nent = 0;
2470 kmem_free(fasttrap_provs.fth_table,
2471 fasttrap_provs.fth_nent * sizeof (fasttrap_bucket_t));
2472 fasttrap_provs.fth_nent = 0;
2474 kmem_free(fasttrap_procs.fth_table,
2475 fasttrap_procs.fth_nent * sizeof (fasttrap_bucket_t));
2476 fasttrap_procs.fth_nent = 0;
2479 destroy_dev(fasttrap_cdev);
2480 mutex_destroy(&fasttrap_count_mtx);
2482 mutex_destroy(&fasttrap_cpuc_pid_lock[i]);
2491 fasttrap_modevent(module_t mod __unused, int type, void *data __unused)
2512 SYSINIT(fasttrap_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, fasttrap_load,
2514 SYSUNINIT(fasttrap_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY,
2515 fasttrap_unload, NULL);
2517 DEV_MODULE(fasttrap, fasttrap_modevent, NULL);
2518 MODULE_VERSION(fasttrap, 1);
2519 MODULE_DEPEND(fasttrap, dtrace, 1, 1, 1);
2520 MODULE_DEPEND(fasttrap, opensolaris, 1, 1, 1);