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

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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 2010 The FreeBSD Foundation
22 *
23 * $FreeBSD: head/sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c 211925 2010-08-28 08:13:38Z rpaulo $
24 */
25
26/*
27 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
28 * Use is subject to license terms.
29 */
30
31#if defined(sun)

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203static fasttrap_proc_t *fasttrap_proc_lookup(pid_t);
204static void fasttrap_proc_release(fasttrap_proc_t *);
205
206#define FASTTRAP_PROVS_INDEX(pid, name) \
207 ((fasttrap_hash_str(name) + (pid)) & fasttrap_provs.fth_mask)
208
209#define FASTTRAP_PROCS_INDEX(pid) ((pid) & fasttrap_procs.fth_mask)
210
211#if !defined(sun)
212static kmutex_t fasttrap_cpuc_pid_lock[MAXCPU];
213#endif
214
215static int
216fasttrap_highbit(ulong_t i)
217{
218 int h = 1;
219
220 if (i == 0)
221 return (0);
222#ifdef _LP64

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288
289/*
290 * This function ensures that no threads are actively using the memory
291 * associated with probes that were formerly live.
292 */
293static void
294fasttrap_mod_barrier(uint64_t gen)
295{
296 int i;
297
298 if (gen < fasttrap_mod_gen)
299 return;
300
301 fasttrap_mod_gen++;
302
303 CPU_FOREACH(i) {
304 mutex_enter(&fasttrap_cpuc_pid_lock[i]);
305 mutex_exit(&fasttrap_cpuc_pid_lock[i]);
306 }
307}
308
309/*
310 * This is the timeout's callback for cleaning up the providers and their
311 * probes.
312 */
313/*ARGSUSED*/
314static void

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2318 ASSERT(fasttrap_procs.fth_nent > 0);
2319 fasttrap_procs.fth_mask = fasttrap_procs.fth_nent - 1;
2320 fasttrap_procs.fth_table = kmem_zalloc(fasttrap_procs.fth_nent *
2321 sizeof (fasttrap_bucket_t), KM_SLEEP);
2322#if !defined(sun)
2323 for (i = 0; i < fasttrap_procs.fth_nent; i++)
2324 mutex_init(&fasttrap_procs.fth_table[i].ftb_mtx,
2325 "processes bucket mtx", MUTEX_DEFAULT, NULL);
2326
2327 CPU_FOREACH(i) {
2328 mutex_init(&fasttrap_cpuc_pid_lock[i], "fasttrap barrier",
2329 MUTEX_DEFAULT, NULL);
2330 }
2331#endif
2332
2333 (void) dtrace_meta_register("fasttrap", &fasttrap_mops, NULL,
2334 &fasttrap_meta_id);
2335
2336 return (0);
2337}
2338

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2447 dtrace_fasttrap_exec = NULL;
2448
2449 ASSERT(dtrace_fasttrap_exit == &fasttrap_exec_exit);
2450 dtrace_fasttrap_exit = NULL;
2451
2452#if !defined(sun)
2453 destroy_dev(fasttrap_cdev);
2454 mutex_destroy(&fasttrap_count_mtx);
2455 CPU_FOREACH(i) {
2456 mutex_destroy(&fasttrap_cpuc_pid_lock[i]);
2457 }
2458#endif
2459
2460 return (0);
2461}
2462
2463/* ARGSUSED */
2464static int
2465fasttrap_modevent(module_t mod __unused, int type, void *data __unused)

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