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 * $FreeBSD$
22 *
23 */
24
25static void
26dtrace_ap_start(void *dummy)
27{
28	int i;
29
30	mutex_enter(&cpu_lock);
31
32	/* Setup the rest of the CPUs. */
33	CPU_FOREACH(i) {
34		if (i == 0)
35			continue;
36
37		(void) dtrace_cpu_setup(CPU_CONFIG, i);
38	}
39
40	mutex_exit(&cpu_lock);
41}
42
43SYSINIT(dtrace_ap_start, SI_SUB_SMP, SI_ORDER_ANY, dtrace_ap_start, NULL);
44
45static void
46dtrace_load(void *dummy)
47{
48	dtrace_provider_id_t id;
49
50	/* Hook into the trap handler. */
51	dtrace_trap_func = dtrace_trap;
52
53	/* Hang our hook for thread switches. */
54	dtrace_vtime_switch_func = dtrace_vtime_switch;
55
56	/* Hang our hook for exceptions. */
57	dtrace_invop_init();
58
59	dtrace_taskq = taskq_create("dtrace_taskq", 1, maxclsyspri, 0, 0, 0);
60
61	dtrace_arena = new_unrhdr(1, INT_MAX, &dtrace_unr_mtx);
62
63	/* Register callbacks for linker file load and unload events. */
64	dtrace_kld_load_tag = EVENTHANDLER_REGISTER(kld_load,
65	    dtrace_kld_load, NULL, EVENTHANDLER_PRI_ANY);
66	dtrace_kld_unload_try_tag = EVENTHANDLER_REGISTER(kld_unload_try,
67	    dtrace_kld_unload_try, NULL, EVENTHANDLER_PRI_ANY);
68
69	/*
70	 * Initialise the mutexes without 'witness' because the dtrace
71	 * code is mostly written to wait for memory. To have the
72	 * witness code change a malloc() from M_WAITOK to M_NOWAIT
73	 * because a lock is held would surely create a panic in a
74	 * low memory situation. And that low memory situation might be
75	 * the very problem we are trying to trace.
76	 */
77	mutex_init(&dtrace_lock,"dtrace probe state", MUTEX_DEFAULT, NULL);
78	mutex_init(&dtrace_provider_lock,"dtrace provider state", MUTEX_DEFAULT, NULL);
79	mutex_init(&dtrace_meta_lock,"dtrace meta-provider state", MUTEX_DEFAULT, NULL);
80#ifdef DEBUG
81	mutex_init(&dtrace_errlock,"dtrace error lock", MUTEX_DEFAULT, NULL);
82#endif
83
84	mutex_enter(&dtrace_provider_lock);
85	mutex_enter(&dtrace_lock);
86	mutex_enter(&cpu_lock);
87
88	ASSERT(MUTEX_HELD(&cpu_lock));
89
90	dtrace_state_cache = kmem_cache_create("dtrace_state_cache",
91	    sizeof (dtrace_dstate_percpu_t) * NCPU, DTRACE_STATE_ALIGN,
92	    NULL, NULL, NULL, NULL, NULL, 0);
93
94	ASSERT(MUTEX_HELD(&cpu_lock));
95	dtrace_bymod = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_mod),
96	    offsetof(dtrace_probe_t, dtpr_nextmod),
97	    offsetof(dtrace_probe_t, dtpr_prevmod));
98
99	dtrace_byfunc = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_func),
100	    offsetof(dtrace_probe_t, dtpr_nextfunc),
101	    offsetof(dtrace_probe_t, dtpr_prevfunc));
102
103	dtrace_byname = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_name),
104	    offsetof(dtrace_probe_t, dtpr_nextname),
105	    offsetof(dtrace_probe_t, dtpr_prevname));
106
107	if (dtrace_retain_max < 1) {
108		cmn_err(CE_WARN, "illegal value (%lu) for dtrace_retain_max; "
109		    "setting to 1", dtrace_retain_max);
110		dtrace_retain_max = 1;
111	}
112
113	/*
114	 * Now discover our toxic ranges.
115	 */
116	dtrace_toxic_ranges(dtrace_toxrange_add);
117
118	/*
119	 * Before we register ourselves as a provider to our own framework,
120	 * we would like to assert that dtrace_provider is NULL -- but that's
121	 * not true if we were loaded as a dependency of a DTrace provider.
122	 * Once we've registered, we can assert that dtrace_provider is our
123	 * pseudo provider.
124	 */
125	(void) dtrace_register("dtrace", &dtrace_provider_attr,
126	    DTRACE_PRIV_NONE, 0, &dtrace_provider_ops, NULL, &id);
127
128	ASSERT(dtrace_provider != NULL);
129	ASSERT((dtrace_provider_id_t)dtrace_provider == id);
130
131	dtrace_probeid_begin = dtrace_probe_create((dtrace_provider_id_t)
132	    dtrace_provider, NULL, NULL, "BEGIN", 0, NULL);
133	dtrace_probeid_end = dtrace_probe_create((dtrace_provider_id_t)
134	    dtrace_provider, NULL, NULL, "END", 0, NULL);
135	dtrace_probeid_error = dtrace_probe_create((dtrace_provider_id_t)
136	    dtrace_provider, NULL, NULL, "ERROR", 1, NULL);
137
138	mutex_exit(&cpu_lock);
139
140	mutex_exit(&dtrace_lock);
141	mutex_exit(&dtrace_provider_lock);
142
143	mutex_enter(&cpu_lock);
144
145	/* Setup the boot CPU */
146	(void) dtrace_cpu_setup(CPU_CONFIG, 0);
147
148	mutex_exit(&cpu_lock);
149
150	dtrace_dev = make_dev(&dtrace_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
151	    "dtrace/dtrace");
152	helper_dev = make_dev(&helper_cdevsw, 0, UID_ROOT, GID_WHEEL, 0660,
153	    "dtrace/helper");
154
155	return;
156}
157