1 /*
2 * CDDL HEADER START
3 *
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.
7 *
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.
12 *
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]
18 *
19 * CDDL HEADER END
20 *
21 * Portions Copyright 2006-2008 John Birrell jb@freebsd.org
22 *
23 * $FreeBSD: stable/12/sys/cddl/dev/profile/profile.c 372247 2022-07-29 17:08:52Z dim $
24 *
25 */
26
27 /*
28 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
29 * Use is subject to license terms.
30 */
31
32 #include <sys/cdefs.h>
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/conf.h>
36 #include <sys/cpuvar.h>
37 #include <sys/fcntl.h>
38 #include <sys/filio.h>
39 #include <sys/kdb.h>
40 #include <sys/kernel.h>
41 #include <sys/kmem.h>
42 #include <sys/kthread.h>
43 #include <sys/limits.h>
44 #include <sys/linker.h>
45 #include <sys/lock.h>
46 #include <sys/malloc.h>
47 #include <sys/module.h>
48 #include <sys/mutex.h>
49 #include <sys/poll.h>
50 #include <sys/proc.h>
51 #include <sys/selinfo.h>
52 #include <sys/smp.h>
53 #include <sys/sysctl.h>
54 #include <sys/uio.h>
55 #include <sys/unistd.h>
56 #include <machine/cpu.h>
57 #include <machine/stdarg.h>
58
59 #include <sys/dtrace.h>
60 #include <sys/dtrace_bsd.h>
61
62 #define PROF_NAMELEN 15
63
64 #define PROF_PROFILE 0
65 #define PROF_TICK 1
66 #define PROF_PREFIX_PROFILE "profile-"
67 #define PROF_PREFIX_TICK "tick-"
68
69 /*
70 * Regardless of platform, there are five artificial frames in the case of the
71 * profile provider:
72 *
73 * profile_fire
74 * cyclic_expire
75 * cyclic_fire
76 * [ cbe ]
77 * [ locore ]
78 *
79 * On amd64, there are two frames associated with locore: one in locore, and
80 * another in common interrupt dispatch code. (i386 has not been modified to
81 * use this common layer.) Further, on i386, the interrupted instruction
82 * appears as its own stack frame. All of this means that we need to add one
83 * frame for amd64, and then take one away for both amd64 and i386.
84 *
85 * On SPARC, the picture is further complicated because the compiler
86 * optimizes away tail-calls -- so the following frames are optimized away:
87 *
88 * profile_fire
89 * cyclic_expire
90 *
91 * This gives three frames. However, on DEBUG kernels, the cyclic_expire
92 * frame cannot be tail-call eliminated, yielding four frames in this case.
93 *
94 * All of the above constraints lead to the mess below. Yes, the profile
95 * provider should ideally figure this out on-the-fly by hiting one of its own
96 * probes and then walking its own stack trace. This is complicated, however,
97 * and the static definition doesn't seem to be overly brittle. Still, we
98 * allow for a manual override in case we get it completely wrong.
99 */
100 #ifdef __amd64
101 #define PROF_ARTIFICIAL_FRAMES 10
102 #else
103 #ifdef __i386
104 #define PROF_ARTIFICIAL_FRAMES 6
105 #else
106 #ifdef __sparc
107 #ifdef DEBUG
108 #define PROF_ARTIFICIAL_FRAMES 4
109 #else
110 #define PROF_ARTIFICIAL_FRAMES 3
111 #endif
112 #endif
113 #endif
114 #endif
115
116 #ifdef __mips
117 /*
118 * This value is bogus just to make module compilable on mips
119 */
120 #define PROF_ARTIFICIAL_FRAMES 3
121 #endif
122
123 #ifdef __powerpc__
124 /*
125 * This value is bogus just to make module compilable on powerpc
126 */
127 #define PROF_ARTIFICIAL_FRAMES 3
128 #endif
129
130 struct profile_probe_percpu;
131
132 #ifdef __mips
133 /* bogus */
134 #define PROF_ARTIFICIAL_FRAMES 3
135 #endif
136
137 #ifdef __arm__
138 #define PROF_ARTIFICIAL_FRAMES 3
139 #endif
140
141 #ifdef __aarch64__
142 /* TODO: verify */
143 #define PROF_ARTIFICIAL_FRAMES 10
144 #endif
145
146 #ifdef __riscv
147 /* TODO: verify */
148 #define PROF_ARTIFICIAL_FRAMES 10
149 #endif
150
151 typedef struct profile_probe {
152 char prof_name[PROF_NAMELEN];
153 dtrace_id_t prof_id;
154 int prof_kind;
155 #ifdef illumos
156 hrtime_t prof_interval;
157 cyclic_id_t prof_cyclic;
158 #else
159 sbintime_t prof_interval;
160 struct callout prof_cyclic;
161 sbintime_t prof_expected;
162 struct profile_probe_percpu **prof_pcpus;
163 #endif
164 } profile_probe_t;
165
166 typedef struct profile_probe_percpu {
167 hrtime_t profc_expected;
168 hrtime_t profc_interval;
169 profile_probe_t *profc_probe;
170 #ifdef __FreeBSD__
171 struct callout profc_cyclic;
172 #endif
173 } profile_probe_percpu_t;
174
175 static d_open_t profile_open;
176 static int profile_unload(void);
177 static void profile_create(hrtime_t, char *, int);
178 static void profile_destroy(void *, dtrace_id_t, void *);
179 static void profile_enable(void *, dtrace_id_t, void *);
180 static void profile_disable(void *, dtrace_id_t, void *);
181 static void profile_load(void *);
182 static void profile_provide(void *, dtrace_probedesc_t *);
183
184 static int profile_rates[] = {
185 97, 199, 499, 997, 1999,
186 4001, 4999, 0, 0, 0,
187 0, 0, 0, 0, 0,
188 0, 0, 0, 0, 0
189 };
190
191 static int profile_ticks[] = {
192 1, 10, 100, 500, 1000,
193 5000, 0, 0, 0, 0,
194 0, 0, 0, 0, 0
195 };
196
197 /*
198 * profile_max defines the upper bound on the number of profile probes that
199 * can exist (this is to prevent malicious or clumsy users from exhausing
200 * system resources by creating a slew of profile probes). At mod load time,
201 * this gets its value from PROFILE_MAX_DEFAULT or profile-max-probes if it's
202 * present in the profile.conf file.
203 */
204 #define PROFILE_MAX_DEFAULT 1000 /* default max. number of probes */
205 static uint32_t profile_max = PROFILE_MAX_DEFAULT;
206 /* maximum number of profile probes */
207 static uint32_t profile_total; /* current number of profile probes */
208
209 static struct cdevsw profile_cdevsw = {
210 .d_version = D_VERSION,
211 .d_open = profile_open,
212 .d_name = "profile",
213 };
214
215 static dtrace_pattr_t profile_attr = {
216 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
217 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
218 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
219 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
220 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
221 };
222
223 static dtrace_pops_t profile_pops = {
224 .dtps_provide = profile_provide,
225 .dtps_provide_module = NULL,
226 .dtps_enable = profile_enable,
227 .dtps_disable = profile_disable,
228 .dtps_suspend = NULL,
229 .dtps_resume = NULL,
230 .dtps_getargdesc = NULL,
231 .dtps_getargval = NULL,
232 .dtps_usermode = NULL,
233 .dtps_destroy = profile_destroy
234 };
235
236 static struct cdev *profile_cdev;
237 static dtrace_provider_id_t profile_id;
238 static hrtime_t profile_interval_min = NANOSEC / 5000; /* 5000 hz */
239 static int profile_aframes = PROF_ARTIFICIAL_FRAMES;
240
241 SYSCTL_DECL(_kern_dtrace);
242 SYSCTL_NODE(_kern_dtrace, OID_AUTO, profile, CTLFLAG_RD, 0, "DTrace profile parameters");
243 SYSCTL_INT(_kern_dtrace_profile, OID_AUTO, aframes, CTLFLAG_RW, &profile_aframes,
244 0, "Skipped frames for profile provider");
245
246 static sbintime_t
nsec_to_sbt(hrtime_t nsec)247 nsec_to_sbt(hrtime_t nsec)
248 {
249 time_t sec;
250
251 /*
252 * We need to calculate nsec * 2^32 / 10^9
253 * Seconds and nanoseconds are split to avoid overflow.
254 */
255 sec = nsec / NANOSEC;
256 nsec = nsec % NANOSEC;
257 return (((sbintime_t)sec << 32) | ((sbintime_t)nsec << 32) / NANOSEC);
258 }
259
260 static hrtime_t
sbt_to_nsec(sbintime_t sbt)261 sbt_to_nsec(sbintime_t sbt)
262 {
263
264 return ((sbt >> 32) * NANOSEC +
265 (((uint32_t)sbt * (hrtime_t)NANOSEC) >> 32));
266 }
267
268 static void
profile_probe(profile_probe_t * prof,hrtime_t late)269 profile_probe(profile_probe_t *prof, hrtime_t late)
270 {
271 struct thread *td;
272 struct trapframe *frame;
273 uintfptr_t pc, upc;
274
275 td = curthread;
276 pc = upc = 0;
277
278 /*
279 * td_intr_frame can be unset if this is a catch-up event upon waking up
280 * from idle sleep. This can only happen on a CPU idle thread. Use a
281 * representative arg0 value in this case so that one of the probe
282 * arguments is non-zero.
283 */
284 frame = td->td_intr_frame;
285 if (frame != NULL) {
286 if (TRAPF_USERMODE(frame))
287 upc = TRAPF_PC(frame);
288 else
289 pc = TRAPF_PC(frame);
290 } else if (TD_IS_IDLETHREAD(td))
291 pc = (uintfptr_t)&cpu_idle;
292
293 dtrace_probe(prof->prof_id, pc, upc, late, 0, 0);
294 }
295
296 static void
profile_fire(void * arg)297 profile_fire(void *arg)
298 {
299 profile_probe_percpu_t *pcpu = arg;
300 profile_probe_t *prof = pcpu->profc_probe;
301 hrtime_t late;
302
303 late = sbt_to_nsec(sbinuptime() - pcpu->profc_expected);
304
305 profile_probe(prof, late);
306 pcpu->profc_expected += pcpu->profc_interval;
307 callout_schedule_sbt_curcpu(&pcpu->profc_cyclic,
308 pcpu->profc_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
309 }
310
311 static void
profile_tick(void * arg)312 profile_tick(void *arg)
313 {
314 profile_probe_t *prof = arg;
315
316 profile_probe(prof, 0);
317 prof->prof_expected += prof->prof_interval;
318 callout_schedule_sbt(&prof->prof_cyclic,
319 prof->prof_expected, 0, C_DIRECT_EXEC | C_ABSOLUTE);
320 }
321
322 static void
profile_create(hrtime_t interval,char * name,int kind)323 profile_create(hrtime_t interval, char *name, int kind)
324 {
325 profile_probe_t *prof;
326
327 if (interval < profile_interval_min)
328 return;
329
330 if (dtrace_probe_lookup(profile_id, NULL, NULL, name) != 0)
331 return;
332
333 atomic_add_32(&profile_total, 1);
334 if (profile_total > profile_max) {
335 atomic_add_32(&profile_total, -1);
336 return;
337 }
338
339 prof = kmem_zalloc(sizeof (profile_probe_t), KM_SLEEP);
340 (void) strcpy(prof->prof_name, name);
341 #ifdef illumos
342 prof->prof_interval = interval;
343 prof->prof_cyclic = CYCLIC_NONE;
344 #else
345 prof->prof_interval = nsec_to_sbt(interval);
346 callout_init(&prof->prof_cyclic, 1);
347 #endif
348 prof->prof_kind = kind;
349 prof->prof_id = dtrace_probe_create(profile_id,
350 NULL, NULL, name,
351 profile_aframes, prof);
352 }
353
354 /*ARGSUSED*/
355 static void
profile_provide(void * arg,dtrace_probedesc_t * desc)356 profile_provide(void *arg, dtrace_probedesc_t *desc)
357 {
358 int i, j, rate, kind;
359 hrtime_t val = 0, mult = 1, len = 0;
360 char *name, *suffix = NULL;
361
362 const struct {
363 char *prefix;
364 int kind;
365 } types[] = {
366 { PROF_PREFIX_PROFILE, PROF_PROFILE },
367 { PROF_PREFIX_TICK, PROF_TICK },
368 { 0, 0 }
369 };
370
371 const struct {
372 char *name;
373 hrtime_t mult;
374 } suffixes[] = {
375 { "ns", NANOSEC / NANOSEC },
376 { "nsec", NANOSEC / NANOSEC },
377 { "us", NANOSEC / MICROSEC },
378 { "usec", NANOSEC / MICROSEC },
379 { "ms", NANOSEC / MILLISEC },
380 { "msec", NANOSEC / MILLISEC },
381 { "s", NANOSEC / SEC },
382 { "sec", NANOSEC / SEC },
383 { "m", NANOSEC * (hrtime_t)60 },
384 { "min", NANOSEC * (hrtime_t)60 },
385 { "h", NANOSEC * (hrtime_t)(60 * 60) },
386 { "hour", NANOSEC * (hrtime_t)(60 * 60) },
387 { "d", NANOSEC * (hrtime_t)(24 * 60 * 60) },
388 { "day", NANOSEC * (hrtime_t)(24 * 60 * 60) },
389 { "hz", 0 },
390 { NULL }
391 };
392
393 if (desc == NULL) {
394 char n[PROF_NAMELEN];
395
396 /*
397 * If no description was provided, provide all of our probes.
398 */
399 for (i = 0; i < sizeof (profile_rates) / sizeof (int); i++) {
400 if ((rate = profile_rates[i]) == 0)
401 continue;
402
403 (void) snprintf(n, PROF_NAMELEN, "%s%d",
404 PROF_PREFIX_PROFILE, rate);
405 profile_create(NANOSEC / rate, n, PROF_PROFILE);
406 }
407
408 for (i = 0; i < sizeof (profile_ticks) / sizeof (int); i++) {
409 if ((rate = profile_ticks[i]) == 0)
410 continue;
411
412 (void) snprintf(n, PROF_NAMELEN, "%s%d",
413 PROF_PREFIX_TICK, rate);
414 profile_create(NANOSEC / rate, n, PROF_TICK);
415 }
416
417 return;
418 }
419
420 name = desc->dtpd_name;
421
422 for (i = 0; types[i].prefix != NULL; i++) {
423 len = strlen(types[i].prefix);
424
425 if (strncmp(name, types[i].prefix, len) != 0)
426 continue;
427 break;
428 }
429
430 if (types[i].prefix == NULL)
431 return;
432
433 kind = types[i].kind;
434 j = strlen(name) - len;
435
436 /*
437 * We need to start before any time suffix.
438 */
439 for (j = strlen(name); j >= len; j--) {
440 if (name[j] >= '0' && name[j] <= '9')
441 break;
442 suffix = &name[j];
443 }
444
445 ASSERT(suffix != NULL);
446
447 /*
448 * Now determine the numerical value present in the probe name.
449 */
450 for (; j >= len; j--) {
451 if (name[j] < '0' || name[j] > '9')
452 return;
453
454 val += (name[j] - '0') * mult;
455 mult *= (hrtime_t)10;
456 }
457
458 if (val == 0)
459 return;
460
461 /*
462 * Look-up the suffix to determine the multiplier.
463 */
464 for (i = 0, mult = 0; suffixes[i].name != NULL; i++) {
465 if (strcasecmp(suffixes[i].name, suffix) == 0) {
466 mult = suffixes[i].mult;
467 break;
468 }
469 }
470
471 if (suffixes[i].name == NULL && *suffix != '\0')
472 return;
473
474 if (mult == 0) {
475 /*
476 * The default is frequency-per-second.
477 */
478 val = NANOSEC / val;
479 } else {
480 val *= mult;
481 }
482
483 profile_create(val, name, kind);
484 }
485
486 /* ARGSUSED */
487 static void
profile_destroy(void * arg,dtrace_id_t id,void * parg)488 profile_destroy(void *arg, dtrace_id_t id, void *parg)
489 {
490 profile_probe_t *prof = parg;
491
492 #ifdef illumos
493 ASSERT(prof->prof_cyclic == CYCLIC_NONE);
494 #else
495 ASSERT(!callout_active(&prof->prof_cyclic) && prof->prof_pcpus == NULL);
496 #endif
497 kmem_free(prof, sizeof (profile_probe_t));
498
499 ASSERT(profile_total >= 1);
500 atomic_add_32(&profile_total, -1);
501 }
502
503 #ifdef illumos
504 /*ARGSUSED*/
505 static void
profile_online(void * arg,cpu_t * cpu,cyc_handler_t * hdlr,cyc_time_t * when)506 profile_online(void *arg, cpu_t *cpu, cyc_handler_t *hdlr, cyc_time_t *when)
507 {
508 profile_probe_t *prof = arg;
509 profile_probe_percpu_t *pcpu;
510
511 pcpu = kmem_zalloc(sizeof (profile_probe_percpu_t), KM_SLEEP);
512 pcpu->profc_probe = prof;
513
514 hdlr->cyh_func = profile_fire;
515 hdlr->cyh_arg = pcpu;
516
517 when->cyt_interval = prof->prof_interval;
518 when->cyt_when = gethrtime() + when->cyt_interval;
519
520 pcpu->profc_expected = when->cyt_when;
521 pcpu->profc_interval = when->cyt_interval;
522 }
523
524 /*ARGSUSED*/
525 static void
profile_offline(void * arg,cpu_t * cpu,void * oarg)526 profile_offline(void *arg, cpu_t *cpu, void *oarg)
527 {
528 profile_probe_percpu_t *pcpu = oarg;
529
530 ASSERT(pcpu->profc_probe == arg);
531 kmem_free(pcpu, sizeof (profile_probe_percpu_t));
532 }
533
534 /* ARGSUSED */
535 static void
profile_enable(void * arg,dtrace_id_t id,void * parg)536 profile_enable(void *arg, dtrace_id_t id, void *parg)
537 {
538 profile_probe_t *prof = parg;
539 cyc_omni_handler_t omni;
540 cyc_handler_t hdlr;
541 cyc_time_t when;
542
543 ASSERT(prof->prof_interval != 0);
544 ASSERT(MUTEX_HELD(&cpu_lock));
545
546 if (prof->prof_kind == PROF_TICK) {
547 hdlr.cyh_func = profile_tick;
548 hdlr.cyh_arg = prof;
549
550 when.cyt_interval = prof->prof_interval;
551 when.cyt_when = gethrtime() + when.cyt_interval;
552 } else {
553 ASSERT(prof->prof_kind == PROF_PROFILE);
554 omni.cyo_online = profile_online;
555 omni.cyo_offline = profile_offline;
556 omni.cyo_arg = prof;
557 }
558
559 if (prof->prof_kind == PROF_TICK) {
560 prof->prof_cyclic = cyclic_add(&hdlr, &when);
561 } else {
562 prof->prof_cyclic = cyclic_add_omni(&omni);
563 }
564 }
565
566 /* ARGSUSED */
567 static void
profile_disable(void * arg,dtrace_id_t id,void * parg)568 profile_disable(void *arg, dtrace_id_t id, void *parg)
569 {
570 profile_probe_t *prof = parg;
571
572 ASSERT(prof->prof_cyclic != CYCLIC_NONE);
573 ASSERT(MUTEX_HELD(&cpu_lock));
574
575 cyclic_remove(prof->prof_cyclic);
576 prof->prof_cyclic = CYCLIC_NONE;
577 }
578
579 #else
580
581 static void
profile_enable_omni(profile_probe_t * prof)582 profile_enable_omni(profile_probe_t *prof)
583 {
584 profile_probe_percpu_t *pcpu;
585 int cpu;
586
587 prof->prof_pcpus = kmem_zalloc((mp_maxid + 1) * sizeof(pcpu), KM_SLEEP);
588 CPU_FOREACH(cpu) {
589 pcpu = kmem_zalloc(sizeof(profile_probe_percpu_t), KM_SLEEP);
590 prof->prof_pcpus[cpu] = pcpu;
591 pcpu->profc_probe = prof;
592 pcpu->profc_expected = sbinuptime() + prof->prof_interval;
593 pcpu->profc_interval = prof->prof_interval;
594 callout_init(&pcpu->profc_cyclic, 1);
595 callout_reset_sbt_on(&pcpu->profc_cyclic,
596 pcpu->profc_expected, 0, profile_fire, pcpu,
597 cpu, C_DIRECT_EXEC | C_ABSOLUTE);
598 }
599 }
600
601 static void
profile_disable_omni(profile_probe_t * prof)602 profile_disable_omni(profile_probe_t *prof)
603 {
604 profile_probe_percpu_t *pcpu;
605 int cpu;
606
607 ASSERT(prof->prof_pcpus != NULL);
608 CPU_FOREACH(cpu) {
609 pcpu = prof->prof_pcpus[cpu];
610 ASSERT(pcpu->profc_probe == prof);
611 ASSERT(callout_active(&pcpu->profc_cyclic));
612 callout_stop(&pcpu->profc_cyclic);
613 callout_drain(&pcpu->profc_cyclic);
614 kmem_free(pcpu, sizeof(profile_probe_percpu_t));
615 }
616 kmem_free(prof->prof_pcpus, (mp_maxid + 1) * sizeof(pcpu));
617 prof->prof_pcpus = NULL;
618 }
619
620 /* ARGSUSED */
621 static void
profile_enable(void * arg,dtrace_id_t id,void * parg)622 profile_enable(void *arg, dtrace_id_t id, void *parg)
623 {
624 profile_probe_t *prof = parg;
625
626 if (prof->prof_kind == PROF_TICK) {
627 prof->prof_expected = sbinuptime() + prof->prof_interval;
628 callout_reset_sbt(&prof->prof_cyclic,
629 prof->prof_expected, 0, profile_tick, prof,
630 C_DIRECT_EXEC | C_ABSOLUTE);
631 } else {
632 ASSERT(prof->prof_kind == PROF_PROFILE);
633 profile_enable_omni(prof);
634 }
635 }
636
637 /* ARGSUSED */
638 static void
profile_disable(void * arg,dtrace_id_t id,void * parg)639 profile_disable(void *arg, dtrace_id_t id, void *parg)
640 {
641 profile_probe_t *prof = parg;
642
643 if (prof->prof_kind == PROF_TICK) {
644 ASSERT(callout_active(&prof->prof_cyclic));
645 callout_stop(&prof->prof_cyclic);
646 callout_drain(&prof->prof_cyclic);
647 } else {
648 ASSERT(prof->prof_kind == PROF_PROFILE);
649 profile_disable_omni(prof);
650 }
651 }
652 #endif
653
654 static void
profile_load(void * dummy)655 profile_load(void *dummy)
656 {
657 /* Create the /dev/dtrace/profile entry. */
658 profile_cdev = make_dev(&profile_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
659 "dtrace/profile");
660
661 if (dtrace_register("profile", &profile_attr, DTRACE_PRIV_USER,
662 NULL, &profile_pops, NULL, &profile_id) != 0)
663 return;
664 }
665
666
667 static int
profile_unload(void)668 profile_unload(void)
669 {
670 int error = 0;
671
672 if ((error = dtrace_unregister(profile_id)) != 0)
673 return (error);
674
675 destroy_dev(profile_cdev);
676
677 return (error);
678 }
679
680 /* ARGSUSED */
681 static int
profile_modevent(module_t mod __unused,int type,void * data __unused)682 profile_modevent(module_t mod __unused, int type, void *data __unused)
683 {
684 int error = 0;
685
686 switch (type) {
687 case MOD_LOAD:
688 break;
689
690 case MOD_UNLOAD:
691 break;
692
693 case MOD_SHUTDOWN:
694 break;
695
696 default:
697 error = EOPNOTSUPP;
698 break;
699
700 }
701 return (error);
702 }
703
704 /* ARGSUSED */
705 static int
profile_open(struct cdev * dev __unused,int oflags __unused,int devtype __unused,struct thread * td __unused)706 profile_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
707 {
708 return (0);
709 }
710
711 SYSINIT(profile_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_load, NULL);
712 SYSUNINIT(profile_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_unload, NULL);
713
714 DEV_MODULE(profile, profile_modevent, NULL);
715 MODULE_VERSION(profile, 1);
716 MODULE_DEPEND(profile, dtrace, 1, 1, 1);
717 MODULE_DEPEND(profile, opensolaris, 1, 1, 1);
718