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/*
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26/* #pragma ident "@(#)profile.c 1.7 07/01/10 SMI" */
27
28#ifdef KERNEL
29#ifndef _KERNEL
30#define _KERNEL /* Solaris vs. Darwin */
31#endif
32#endif
33
34#include <kern/cpu_data.h>
35#include <kern/thread.h>
36#include <kern/assert.h>
37#include <mach/thread_status.h>
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/errno.h>
42#include <sys/stat.h>
43#include <sys/ioctl.h>
44#include <sys/conf.h>
45#include <sys/fcntl.h>
46#include <miscfs/devfs/devfs.h>
47
48#include <sys/dtrace.h>
49#include <sys/dtrace_impl.h>
50
51#include <sys/dtrace_glue.h>
52
53#include <machine/pal_routines.h>
54
55#if defined(__x86_64__)
56extern x86_saved_state_t *find_kern_regs(thread_t);
57#elif defined (__arm__) || defined(__arm64__)
58extern struct arm_saved_state *find_kern_regs(thread_t);
59#else
60#error Unknown architecture
61#endif
62
63#undef ASSERT
64#define ASSERT(x) do {} while(0)
65
66extern void profile_init(void);
67
68static dtrace_provider_id_t profile_id;
69
70/*
71 * Regardless of platform, the stack frames look like this in the case of the
72 * profile provider:
73 *
74 * profile_fire
75 * cyclic_expire
76 * cyclic_fire
77 * [ cbe ]
78 * [ interrupt code ]
79 *
80 * On x86, there are five frames from the generic interrupt code; further, the
81 * interrupted instruction appears as its own stack frame, giving us a total of
82 * 10.
83 *
84 * On SPARC, the picture is further complicated because the compiler
85 * optimizes away tail-calls -- so the following frames are optimized away:
86 *
87 * profile_fire
88 * cyclic_expire
89 *
90 * This gives three frames. However, on DEBUG kernels, the cyclic_expire
91 * frame cannot be tail-call eliminated, yielding four frames in this case.
92 *
93 * All of the above constraints lead to the mess below. Yes, the profile
94 * provider should ideally figure this out on-the-fly by hitting one of its own
95 * probes and then walking its own stack trace. This is complicated, however,
96 * and the static definition doesn't seem to be overly brittle. Still, we
97 * allow for a manual override in case we get it completely wrong.
98 */
99
100#if defined(__x86_64__)
101#define PROF_ARTIFICIAL_FRAMES 9
102#elif defined(__arm__) || defined(__arm64__)
103#define PROF_ARTIFICIAL_FRAMES 8
104#else
105#error Unknown architecture
106#endif
107
108#define PROF_NAMELEN 15
109
110#define PROF_PROFILE 0
111#define PROF_TICK 1
112#define PROF_PREFIX_PROFILE "profile-"
113#define PROF_PREFIX_TICK "tick-"
114
115typedef struct profile_probe {
116 char prof_name[PROF_NAMELEN];
117 dtrace_id_t prof_id;
118 int prof_kind;
119 hrtime_t prof_interval;
120 cyclic_id_t prof_cyclic;
121} profile_probe_t;
122
123typedef struct profile_probe_percpu {
124 hrtime_t profc_expected;
125 hrtime_t profc_interval;
126 profile_probe_t *profc_probe;
127} profile_probe_percpu_t;
128
129hrtime_t profile_interval_min = NANOSEC / 5000; /* 5000 hz */
130int profile_aframes = 0; /* override */
131
132static int profile_rates[] = {
133 97, 199, 499, 997, 1999,
134 4001, 4999, 0, 0, 0,
135 0, 0, 0, 0, 0,
136 0, 0, 0, 0, 0
137};
138
139static int profile_ticks[] = {
140 1, 10, 100, 500, 1000,
141 5000, 0, 0, 0, 0,
142 0, 0, 0, 0, 0
143};
144
145/*
146 * profile_max defines the upper bound on the number of profile probes that
147 * can exist (this is to prevent malicious or clumsy users from exhausing
148 * system resources by creating a slew of profile probes). At mod load time,
149 * this gets its value from PROFILE_MAX_DEFAULT or profile-max-probes if it's
150 * present in the profile.conf file.
151 */
152#define PROFILE_MAX_DEFAULT 1000 /* default max. number of probes */
153static uint32_t profile_max; /* maximum number of profile probes */
154static uint32_t profile_total; /* current number of profile probes */
155
156static void
157profile_fire(void *arg)
158{
159 profile_probe_percpu_t *pcpu = arg;
160 profile_probe_t *prof = pcpu->profc_probe;
161 hrtime_t late;
162
163 late = dtrace_gethrtime() - pcpu->profc_expected;
164 pcpu->profc_expected += pcpu->profc_interval;
165
166#if defined(__x86_64__)
167 x86_saved_state_t *kern_regs = find_kern_regs(current_thread());
168
169 if (NULL != kern_regs) {
170 /* Kernel was interrupted. */
171 dtrace_probe(prof->prof_id, saved_state64(kern_regs)->isf.rip, 0x0, late, 0, 0);
172
173 } else {
174 pal_register_cache_state(current_thread(), VALID);
175 /* Possibly a user interrupt */
176 x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread());
177
178 if (NULL == tagged_regs) {
179 /* Too bad, so sad, no useful interrupt state. */
180 dtrace_probe(prof->prof_id, 0xcafebabe,
181 0x0, late, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
182 } else if (is_saved_state64(tagged_regs)) {
183 x86_saved_state64_t *regs = saved_state64(tagged_regs);
184
185 dtrace_probe(prof->prof_id, 0x0, regs->isf.rip, late, 0, 0);
186 } else {
187 x86_saved_state32_t *regs = saved_state32(tagged_regs);
188
189 dtrace_probe(prof->prof_id, 0x0, regs->eip, late, 0, 0);
190 }
191 }
192#elif defined(__arm__)
193 {
194 arm_saved_state_t *arm_kern_regs = (arm_saved_state_t *) find_kern_regs(current_thread());
195
196 // We should only come in here from interrupt context, so we should always have valid kernel regs
197 assert(NULL != arm_kern_regs);
198
199 if (arm_kern_regs->cpsr & 0xF) {
200 /* Kernel was interrupted. */
201 dtrace_probe(prof->prof_id, arm_kern_regs->pc, 0x0, late, 0, 0);
202 } else {
203 /* Possibly a user interrupt */
204 arm_saved_state_t *arm_user_regs = (arm_saved_state_t *)find_user_regs(current_thread());
205
206 if (NULL == arm_user_regs) {
207 /* Too bad, so sad, no useful interrupt state. */
208 dtrace_probe(prof->prof_id, 0xcafebabe, 0x0, late, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
209 } else {
210 dtrace_probe(prof->prof_id, 0x0, arm_user_regs->pc, late, 0, 0);
211 }
212 }
213 }
214#elif defined(__arm64__)
215 {
216 arm_saved_state_t *arm_kern_regs = (arm_saved_state_t *) find_kern_regs(current_thread());
217
218 // We should only come in here from interrupt context, so we should always have valid kernel regs
219 assert(NULL != arm_kern_regs);
220
221 if (saved_state64(arm_kern_regs)->cpsr & 0xF) {
222 /* Kernel was interrupted. */
223 dtrace_probe(prof->prof_id, saved_state64(arm_kern_regs)->pc, 0x0, late, 0, 0);
224 } else {
225 /* Possibly a user interrupt */
226 arm_saved_state_t *arm_user_regs = (arm_saved_state_t *)find_user_regs(current_thread());
227
228 if (NULL == arm_user_regs) {
229 /* Too bad, so sad, no useful interrupt state. */
230 dtrace_probe(prof->prof_id, 0xcafebabe, 0x0, late, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
231 } else {
232 dtrace_probe(prof->prof_id, 0x0, get_saved_state_pc(arm_user_regs), late, 0, 0);
233 }
234 }
235 }
236#else
237#error Unknown architecture
238#endif
239}
240
241static void
242profile_tick(void *arg)
243{
244 profile_probe_t *prof = arg;
245
246#if defined(__x86_64__)
247 x86_saved_state_t *kern_regs = find_kern_regs(current_thread());
248
249 if (NULL != kern_regs) {
250 /* Kernel was interrupted. */
251 dtrace_probe(prof->prof_id, saved_state64(kern_regs)->isf.rip, 0x0, 0, 0, 0);
252 } else {
253 pal_register_cache_state(current_thread(), VALID);
254 /* Possibly a user interrupt */
255 x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread());
256
257 if (NULL == tagged_regs) {
258 /* Too bad, so sad, no useful interrupt state. */
259 dtrace_probe(prof->prof_id, 0xcafebabe,
260 0x0, 0, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
261 } else if (is_saved_state64(tagged_regs)) {
262 x86_saved_state64_t *regs = saved_state64(tagged_regs);
263
264 dtrace_probe(prof->prof_id, 0x0, regs->isf.rip, 0, 0, 0);
265 } else {
266 x86_saved_state32_t *regs = saved_state32(tagged_regs);
267
268 dtrace_probe(prof->prof_id, 0x0, regs->eip, 0, 0, 0);
269 }
270 }
271#elif defined(__arm__)
272 {
273 arm_saved_state_t *arm_kern_regs = (arm_saved_state_t *) find_kern_regs(current_thread());
274
275 if (NULL != arm_kern_regs) {
276 /* Kernel was interrupted. */
277 dtrace_probe(prof->prof_id, arm_kern_regs->pc, 0x0, 0, 0, 0);
278 } else {
279 /* Possibly a user interrupt */
280 arm_saved_state_t *arm_user_regs = (arm_saved_state_t *)find_user_regs(current_thread());
281
282 if (NULL == arm_user_regs) {
283 /* Too bad, so sad, no useful interrupt state. */
284 dtrace_probe(prof->prof_id, 0xcafebabe, 0x0, 0, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
285 } else {
286 dtrace_probe(prof->prof_id, 0x0, arm_user_regs->pc, 0, 0, 0);
287 }
288 }
289 }
290#elif defined(__arm64__)
291 {
292 arm_saved_state_t *arm_kern_regs = (arm_saved_state_t *) find_kern_regs(current_thread());
293
294 if (NULL != arm_kern_regs) {
295 /* Kernel was interrupted. */
296 dtrace_probe(prof->prof_id, saved_state64(arm_kern_regs)->pc, 0x0, 0, 0, 0);
297 } else {
298 /* Possibly a user interrupt */
299 arm_saved_state_t *arm_user_regs = (arm_saved_state_t *)find_user_regs(current_thread());
300
301 if (NULL == arm_user_regs) {
302 /* Too bad, so sad, no useful interrupt state. */
303 dtrace_probe(prof->prof_id, 0xcafebabe, 0x0, 0, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
304 } else {
305 dtrace_probe(prof->prof_id, 0x0, get_saved_state_pc(arm_user_regs), 0, 0, 0);
306 }
307 }
308 }
309
310#else
311#error Unknown architecture
312#endif
313}
314
315static void
316profile_create(hrtime_t interval, const char *name, int kind)
317{
318 profile_probe_t *prof;
319
320 if (interval < profile_interval_min)
321 return;
322
323 if (dtrace_probe_lookup(profile_id, NULL, NULL, name) != 0)
324 return;
325
326 atomic_add_32(&profile_total, 1);
327 if (profile_total > profile_max) {
328 atomic_add_32(&profile_total, -1);
329 return;
330 }
331
332 if (PROF_TICK == kind)
333 prof = kmem_zalloc(sizeof (profile_probe_t), KM_SLEEP);
334 else
335 prof = kmem_zalloc(sizeof (profile_probe_t) + NCPU*sizeof(profile_probe_percpu_t), KM_SLEEP);
336
337 (void) strlcpy(prof->prof_name, name, sizeof(prof->prof_name));
338 prof->prof_interval = interval;
339 prof->prof_cyclic = CYCLIC_NONE;
340 prof->prof_kind = kind;
341 prof->prof_id = dtrace_probe_create(profile_id,
342 NULL, NULL, name,
343 profile_aframes ? profile_aframes : PROF_ARTIFICIAL_FRAMES, prof);
344}
345
346/*ARGSUSED*/
347static void
348profile_provide(void *arg, const dtrace_probedesc_t *desc)
349{
350#pragma unused(arg) /* __APPLE__ */
351 int i, j, rate, kind;
352 hrtime_t val = 0, mult = 1, len;
353 const char *name, *suffix = NULL;
354
355 const struct {
356 const char *prefix;
357 int kind;
358 } types[] = {
359 { PROF_PREFIX_PROFILE, PROF_PROFILE },
360 { PROF_PREFIX_TICK, PROF_TICK },
361 { NULL, 0 }
362 };
363
364 const struct {
365 const char *name;
366 hrtime_t mult;
367 } suffixes[] = {
368 { "ns", NANOSEC / NANOSEC },
369 { "nsec", NANOSEC / NANOSEC },
370 { "us", NANOSEC / MICROSEC },
371 { "usec", NANOSEC / MICROSEC },
372 { "ms", NANOSEC / MILLISEC },
373 { "msec", NANOSEC / MILLISEC },
374 { "s", NANOSEC / SEC },
375 { "sec", NANOSEC / SEC },
376 { "m", NANOSEC * (hrtime_t)60 },
377 { "min", NANOSEC * (hrtime_t)60 },
378 { "h", NANOSEC * (hrtime_t)(60 * 60) },
379 { "hour", NANOSEC * (hrtime_t)(60 * 60) },
380 { "d", NANOSEC * (hrtime_t)(24 * 60 * 60) },
381 { "day", NANOSEC * (hrtime_t)(24 * 60 * 60) },
382 { "hz", 0 },
383 { NULL, 0 }
384 };
385
386 if (desc == NULL) {
387 char n[PROF_NAMELEN];
388
389 /*
390 * If no description was provided, provide all of our probes.
391 */
392 for (i = 0; i < (int)(sizeof (profile_rates) / sizeof (int)); i++) {
393 if ((rate = profile_rates[i]) == 0)
394 continue;
395
396 (void) snprintf(n, PROF_NAMELEN, "%s%d",
397 PROF_PREFIX_PROFILE, rate);
398 profile_create(NANOSEC / rate, n, PROF_PROFILE);
399 }
400
401 for (i = 0; i < (int)(sizeof (profile_ticks) / sizeof (int)); i++) {
402 if ((rate = profile_ticks[i]) == 0)
403 continue;
404
405 (void) snprintf(n, PROF_NAMELEN, "%s%d",
406 PROF_PREFIX_TICK, rate);
407 profile_create(NANOSEC / rate, n, PROF_TICK);
408 }
409
410 return;
411 }
412
413 name = desc->dtpd_name;
414
415 for (i = 0; types[i].prefix != NULL; i++) {
416 len = strlen(types[i].prefix);
417
418 if (strncmp(name, types[i].prefix, len) != 0)
419 continue;
420 break;
421 }
422
423 if (types[i].prefix == NULL)
424 return;
425
426 kind = types[i].kind;
427 j = strlen(name) - len;
428
429 /*
430 * We need to start before any time suffix.
431 */
432 for (j = strlen(name); j >= len; j--) {
433 if (name[j] >= '0' && name[j] <= '9')
434 break;
435 suffix = &name[j];
436 }
437
438 ASSERT(suffix != NULL);
439
440 /*
441 * Now determine the numerical value present in the probe name.
442 */
443 for (; j >= len; j--) {
444 if (name[j] < '0' || name[j] > '9')
445 return;
446
447 val += (name[j] - '0') * mult;
448 mult *= (hrtime_t)10;
449 }
450
451 if (val == 0)
452 return;
453
454 /*
455 * Look-up the suffix to determine the multiplier.
456 */
457 for (i = 0, mult = 0; suffixes[i].name != NULL; i++) {
458 /* APPLE NOTE: Darwin employs size bounded string operations */
459 if (strncasecmp(suffixes[i].name, suffix, strlen(suffixes[i].name) + 1) == 0) {
460 mult = suffixes[i].mult;
461 break;
462 }
463 }
464
465 if (suffixes[i].name == NULL && *suffix != '\0')
466 return;
467
468 if (mult == 0) {
469 /*
470 * The default is frequency-per-second.
471 */
472 val = NANOSEC / val;
473 } else {
474 val *= mult;
475 }
476
477 profile_create(val, name, kind);
478}
479
480/*ARGSUSED*/
481static void
482profile_destroy(void *arg, dtrace_id_t id, void *parg)
483{
484#pragma unused(arg,id) /* __APPLE__ */
485 profile_probe_t *prof = parg;
486
487 ASSERT(prof->prof_cyclic == CYCLIC_NONE);
488
489 if (prof->prof_kind == PROF_TICK)
490 kmem_free(prof, sizeof (profile_probe_t));
491 else
492 kmem_free(prof, sizeof (profile_probe_t) + NCPU*sizeof(profile_probe_percpu_t));
493
494 ASSERT(profile_total >= 1);
495 atomic_add_32(&profile_total, -1);
496}
497
498/*ARGSUSED*/
499static void
500profile_online(void *arg, dtrace_cpu_t *cpu, cyc_handler_t *hdlr, cyc_time_t *when)
501{
502#pragma unused(cpu) /* __APPLE__ */
503 profile_probe_t *prof = arg;
504 profile_probe_percpu_t *pcpu;
505
506 pcpu = ((profile_probe_percpu_t *)(&(prof[1]))) + cpu_number();
507 pcpu->profc_probe = prof;
508
509 hdlr->cyh_func = profile_fire;
510 hdlr->cyh_arg = pcpu;
511 hdlr->cyh_level = CY_HIGH_LEVEL;
512
513 when->cyt_interval = prof->prof_interval;
514 when->cyt_when = dtrace_gethrtime() + when->cyt_interval;
515
516 pcpu->profc_expected = when->cyt_when;
517 pcpu->profc_interval = when->cyt_interval;
518}
519
520/*ARGSUSED*/
521static void
522profile_offline(void *arg, dtrace_cpu_t *cpu, void *oarg)
523{
524 profile_probe_percpu_t *pcpu = oarg;
525
526 ASSERT(pcpu->profc_probe == arg);
527#pragma unused(pcpu,arg,cpu) /* __APPLE__ */
528}
529
530/*ARGSUSED*/
531static int
532profile_enable(void *arg, dtrace_id_t id, void *parg)
533{
534#pragma unused(arg,id) /* __APPLE__ */
535 profile_probe_t *prof = parg;
536 cyc_omni_handler_t omni;
537 cyc_handler_t hdlr;
538 cyc_time_t when;
539
540 ASSERT(prof->prof_interval != 0);
541 ASSERT(MUTEX_HELD(&cpu_lock));
542
543 if (prof->prof_kind == PROF_TICK) {
544 hdlr.cyh_func = profile_tick;
545 hdlr.cyh_arg = prof;
546 hdlr.cyh_level = CY_HIGH_LEVEL;
547
548 when.cyt_interval = prof->prof_interval;
549#if !defined(__APPLE__)
550 when.cyt_when = dtrace_gethrtime() + when.cyt_interval;
551#else
552 when.cyt_when = 0;
553#endif /* __APPLE__ */
554 } else {
555 ASSERT(prof->prof_kind == PROF_PROFILE);
556 omni.cyo_online = profile_online;
557 omni.cyo_offline = profile_offline;
558 omni.cyo_arg = prof;
559 }
560
561 if (prof->prof_kind == PROF_TICK) {
562 prof->prof_cyclic = cyclic_timer_add(&hdlr, &when);
563 } else {
564 prof->prof_cyclic = (cyclic_id_t)cyclic_add_omni(&omni); /* cast puns cyclic_id_list_t with cyclic_id_t */
565 }
566
567 return(0);
568}
569
570/*ARGSUSED*/
571static void
572profile_disable(void *arg, dtrace_id_t id, void *parg)
573{
574 profile_probe_t *prof = parg;
575
576 ASSERT(prof->prof_cyclic != CYCLIC_NONE);
577 ASSERT(MUTEX_HELD(&cpu_lock));
578
579#pragma unused(arg,id)
580 if (prof->prof_kind == PROF_TICK) {
581 cyclic_timer_remove(prof->prof_cyclic);
582 } else {
583 cyclic_remove_omni((cyclic_id_list_t)prof->prof_cyclic); /* cast puns cyclic_id_list_t with cyclic_id_t */
584 }
585 prof->prof_cyclic = CYCLIC_NONE;
586}
587
588static uint64_t
589profile_getarg(void *arg, dtrace_id_t id, void *parg, int argno, int aframes)
590{
591#pragma unused(arg, id, parg, argno, aframes)
592 /*
593 * All the required arguments for the profile probe are passed directly
594 * to dtrace_probe, and we do not go through dtrace_getarg which doesn't
595 * know how to hop to the kernel stack from the interrupt stack like
596 * dtrace_getpcstack
597 */
598 return 0;
599}
600
601static void
602profile_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc)
603{
604#pragma unused(arg, id)
605 profile_probe_t *prof = parg;
606 const char *argdesc = NULL;
607 switch (desc->dtargd_ndx) {
608 case 0:
609 argdesc = "void*";
610 break;
611 case 1:
612 argdesc = "user_addr_t";
613 break;
614 case 2:
615 if (prof->prof_kind == PROF_PROFILE) {
616 argdesc = "hrtime_t";
617 }
618 break;
619 }
620 if (argdesc) {
621 strlcpy(desc->dtargd_native, argdesc, DTRACE_ARGTYPELEN);
622 }
623 else {
624 desc->dtargd_ndx = DTRACE_ARGNONE;
625 }
626}
627
628/*
629 * APPLE NOTE: profile_usermode call not supported.
630 */
631static int
632profile_usermode(void *arg, dtrace_id_t id, void *parg)
633{
634#pragma unused(arg,id,parg)
635 return 1; /* XXX_BOGUS */
636}
637
638static dtrace_pattr_t profile_attr = {
639{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
640{ DTRACE_STABILITY_UNSTABLE, DTRACE_STABILITY_UNSTABLE, DTRACE_CLASS_UNKNOWN },
641{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
642{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
643{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
644};
645
646static dtrace_pops_t profile_pops = {
647 .dtps_provide = profile_provide,
648 .dtps_provide_module = NULL,
649 .dtps_enable = profile_enable,
650 .dtps_disable = profile_disable,
651 .dtps_suspend = NULL,
652 .dtps_resume = NULL,
653 .dtps_getargdesc = profile_getargdesc,
654 .dtps_getargval = profile_getarg,
655 .dtps_usermode = profile_usermode,
656 .dtps_destroy = profile_destroy
657};
658
659static int
660profile_attach(dev_info_t *devi)
661{
662 if (ddi_create_minor_node(devi, "profile", S_IFCHR, 0,
663 DDI_PSEUDO, 0) == DDI_FAILURE ||
664 dtrace_register("profile", &profile_attr,
665 DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER, NULL,
666 &profile_pops, NULL, &profile_id) != 0) {
667 ddi_remove_minor_node(devi, NULL);
668 return (DDI_FAILURE);
669 }
670
671 profile_max = PROFILE_MAX_DEFAULT;
672
673 return (DDI_SUCCESS);
674}
675
676/*
677 * APPLE NOTE: profile_detach not implemented
678 */
679#if !defined(__APPLE__)
680static int
681profile_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
682{
683 switch (cmd) {
684 case DDI_DETACH:
685 break;
686 case DDI_SUSPEND:
687 return (DDI_SUCCESS);
688 default:
689 return (DDI_FAILURE);
690 }
691
692 if (dtrace_unregister(profile_id) != 0)
693 return (DDI_FAILURE);
694
695 ddi_remove_minor_node(devi, NULL);
696 return (DDI_SUCCESS);
697}
698#endif /* __APPLE__ */
699
700d_open_t _profile_open;
701
702int _profile_open(dev_t dev, int flags, int devtype, struct proc *p)
703{
704#pragma unused(dev,flags,devtype,p)
705 return 0;
706}
707
708#define PROFILE_MAJOR -24 /* let the kernel pick the device number */
709
710/*
711 * A struct describing which functions will get invoked for certain
712 * actions.
713 */
714static struct cdevsw profile_cdevsw =
715{
716 _profile_open, /* open */
717 eno_opcl, /* close */
718 eno_rdwrt, /* read */
719 eno_rdwrt, /* write */
720 eno_ioctl, /* ioctl */
721 (stop_fcn_t *)nulldev, /* stop */
722 (reset_fcn_t *)nulldev, /* reset */
723 NULL, /* tty's */
724 eno_select, /* select */
725 eno_mmap, /* mmap */
726 eno_strat, /* strategy */
727 eno_getc, /* getc */
728 eno_putc, /* putc */
729 0 /* type */
730};
731
732void profile_init( void )
733{
734 int majdevno = cdevsw_add(PROFILE_MAJOR, &profile_cdevsw);
735
736 if (majdevno < 0) {
737 printf("profile_init: failed to allocate a major number!\n");
738 return;
739 }
740
741 profile_attach( (dev_info_t*)(uintptr_t)majdevno);
742}
743#undef PROFILE_MAJOR
744