freebsd-dev/sys/cddl/dev/dtrace/dtrace_load.c
2008-11-05 19:39:11 +00:00

169 lines
5.0 KiB
C

/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*
* $FreeBSD$
*
*/
static void
dtrace_ap_start(void *dummy)
{
int i;
mutex_enter(&cpu_lock);
/* Setup the rest of the CPUs. */
for (i = 1; i <= mp_maxid; i++) {
if (pcpu_find(i) == NULL)
continue;
(void) dtrace_cpu_setup(CPU_CONFIG, i);
}
mutex_exit(&cpu_lock);
}
SYSINIT(dtrace_ap_start, SI_SUB_SMP, SI_ORDER_ANY, dtrace_ap_start, NULL);
static void
dtrace_load(void *dummy)
{
dtrace_provider_id_t id;
/* Hook into the trap handler. */
dtrace_trap_func = dtrace_trap;
/* Hang our hook for thread switches. */
dtrace_vtime_switch_func = dtrace_vtime_switch;
/* Hang our hook for exceptions. */
dtrace_invop_init();
/*
* XXX This is a short term hack to avoid having to comment
* out lots and lots of lock/unlock calls.
*/
mutex_init(&mod_lock,"XXX mod_lock hack", MUTEX_DEFAULT, NULL);
/*
* Initialise the mutexes without 'witness' because the dtrace
* code is mostly written to wait for memory. To have the
* witness code change a malloc() from M_WAITOK to M_NOWAIT
* because a lock is held would surely create a panic in a
* low memory situation. And that low memory situation might be
* the very problem we are trying to trace.
*/
mutex_init(&dtrace_lock,"dtrace probe state", MUTEX_DEFAULT, NULL);
mutex_init(&dtrace_provider_lock,"dtrace provider state", MUTEX_DEFAULT, NULL);
mutex_init(&dtrace_meta_lock,"dtrace meta-provider state", MUTEX_DEFAULT, NULL);
mutex_init(&dtrace_errlock,"dtrace error lock", MUTEX_DEFAULT, NULL);
mutex_enter(&dtrace_provider_lock);
mutex_enter(&dtrace_lock);
mutex_enter(&cpu_lock);
ASSERT(MUTEX_HELD(&cpu_lock));
dtrace_arena = new_unrhdr(1, INT_MAX, &dtrace_unr_mtx);
dtrace_state_cache = kmem_cache_create("dtrace_state_cache",
sizeof (dtrace_dstate_percpu_t) * NCPU, DTRACE_STATE_ALIGN,
NULL, NULL, NULL, NULL, NULL, 0);
ASSERT(MUTEX_HELD(&cpu_lock));
dtrace_bymod = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_mod),
offsetof(dtrace_probe_t, dtpr_nextmod),
offsetof(dtrace_probe_t, dtpr_prevmod));
dtrace_byfunc = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_func),
offsetof(dtrace_probe_t, dtpr_nextfunc),
offsetof(dtrace_probe_t, dtpr_prevfunc));
dtrace_byname = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_name),
offsetof(dtrace_probe_t, dtpr_nextname),
offsetof(dtrace_probe_t, dtpr_prevname));
if (dtrace_retain_max < 1) {
cmn_err(CE_WARN, "illegal value (%lu) for dtrace_retain_max; "
"setting to 1", dtrace_retain_max);
dtrace_retain_max = 1;
}
/*
* Now discover our toxic ranges.
*/
dtrace_toxic_ranges(dtrace_toxrange_add);
/*
* Before we register ourselves as a provider to our own framework,
* we would like to assert that dtrace_provider is NULL -- but that's
* not true if we were loaded as a dependency of a DTrace provider.
* Once we've registered, we can assert that dtrace_provider is our
* pseudo provider.
*/
(void) dtrace_register("dtrace", &dtrace_provider_attr,
DTRACE_PRIV_NONE, 0, &dtrace_provider_ops, NULL, &id);
ASSERT(dtrace_provider != NULL);
ASSERT((dtrace_provider_id_t)dtrace_provider == id);
dtrace_probeid_begin = dtrace_probe_create((dtrace_provider_id_t)
dtrace_provider, NULL, NULL, "BEGIN", 0, NULL);
dtrace_probeid_end = dtrace_probe_create((dtrace_provider_id_t)
dtrace_provider, NULL, NULL, "END", 0, NULL);
dtrace_probeid_error = dtrace_probe_create((dtrace_provider_id_t)
dtrace_provider, NULL, NULL, "ERROR", 1, NULL);
mutex_exit(&cpu_lock);
/*
* If DTrace helper tracing is enabled, we need to allocate the
* trace buffer and initialize the values.
*/
if (dtrace_helptrace_enabled) {
ASSERT(dtrace_helptrace_buffer == NULL);
dtrace_helptrace_buffer =
kmem_zalloc(dtrace_helptrace_bufsize, KM_SLEEP);
dtrace_helptrace_next = 0;
}
mutex_exit(&dtrace_lock);
mutex_exit(&dtrace_provider_lock);
mutex_enter(&cpu_lock);
/* Setup the boot CPU */
(void) dtrace_cpu_setup(CPU_CONFIG, 0);
mutex_exit(&cpu_lock);
#if __FreeBSD_version < 800039
/* Enable device cloning. */
clone_setup(&dtrace_clones);
/* Setup device cloning events. */
eh_tag = EVENTHANDLER_REGISTER(dev_clone, dtrace_clone, 0, 1000);
#else
dtrace_dev = make_dev(&dtrace_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "dtrace/dtrace");
#endif
return;
}