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 25 static void 26 dtrace_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 43 SYSINIT(dtrace_ap_start, SI_SUB_SMP, SI_ORDER_ANY, dtrace_ap_start, NULL); 44 45 static void 46 dtrace_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 /* 60 * XXX This is a short term hack to avoid having to comment 61 * out lots and lots of lock/unlock calls. 62 */ 63 mutex_init(&mod_lock,"XXX mod_lock hack", MUTEX_DEFAULT, NULL); 64 65 /* 66 * Initialise the mutexes without 'witness' because the dtrace 67 * code is mostly written to wait for memory. To have the 68 * witness code change a malloc() from M_WAITOK to M_NOWAIT 69 * because a lock is held would surely create a panic in a 70 * low memory situation. And that low memory situation might be 71 * the very problem we are trying to trace. 72 */ 73 mutex_init(&dtrace_lock,"dtrace probe state", MUTEX_DEFAULT, NULL); 74 mutex_init(&dtrace_provider_lock,"dtrace provider state", MUTEX_DEFAULT, NULL); 75 mutex_init(&dtrace_meta_lock,"dtrace meta-provider state", MUTEX_DEFAULT, NULL); 76 mutex_init(&dtrace_errlock,"dtrace error lock", MUTEX_DEFAULT, NULL); 77 78 mutex_enter(&dtrace_provider_lock); 79 mutex_enter(&dtrace_lock); 80 mutex_enter(&cpu_lock); 81 82 ASSERT(MUTEX_HELD(&cpu_lock)); 83 84 dtrace_arena = new_unrhdr(1, INT_MAX, &dtrace_unr_mtx); 85 86 dtrace_state_cache = kmem_cache_create("dtrace_state_cache", 87 sizeof (dtrace_dstate_percpu_t) * NCPU, DTRACE_STATE_ALIGN, 88 NULL, NULL, NULL, NULL, NULL, 0); 89 90 ASSERT(MUTEX_HELD(&cpu_lock)); 91 dtrace_bymod = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_mod), 92 offsetof(dtrace_probe_t, dtpr_nextmod), 93 offsetof(dtrace_probe_t, dtpr_prevmod)); 94 95 dtrace_byfunc = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_func), 96 offsetof(dtrace_probe_t, dtpr_nextfunc), 97 offsetof(dtrace_probe_t, dtpr_prevfunc)); 98 99 dtrace_byname = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_name), 100 offsetof(dtrace_probe_t, dtpr_nextname), 101 offsetof(dtrace_probe_t, dtpr_prevname)); 102 103 if (dtrace_retain_max < 1) { 104 cmn_err(CE_WARN, "illegal value (%lu) for dtrace_retain_max; " 105 "setting to 1", dtrace_retain_max); 106 dtrace_retain_max = 1; 107 } 108 109 /* 110 * Now discover our toxic ranges. 111 */ 112 dtrace_toxic_ranges(dtrace_toxrange_add); 113 114 /* 115 * Before we register ourselves as a provider to our own framework, 116 * we would like to assert that dtrace_provider is NULL -- but that's 117 * not true if we were loaded as a dependency of a DTrace provider. 118 * Once we've registered, we can assert that dtrace_provider is our 119 * pseudo provider. 120 */ 121 (void) dtrace_register("dtrace", &dtrace_provider_attr, 122 DTRACE_PRIV_NONE, 0, &dtrace_provider_ops, NULL, &id); 123 124 ASSERT(dtrace_provider != NULL); 125 ASSERT((dtrace_provider_id_t)dtrace_provider == id); 126 127 dtrace_probeid_begin = dtrace_probe_create((dtrace_provider_id_t) 128 dtrace_provider, NULL, NULL, "BEGIN", 0, NULL); 129 dtrace_probeid_end = dtrace_probe_create((dtrace_provider_id_t) 130 dtrace_provider, NULL, NULL, "END", 0, NULL); 131 dtrace_probeid_error = dtrace_probe_create((dtrace_provider_id_t) 132 dtrace_provider, NULL, NULL, "ERROR", 1, NULL); 133 134 mutex_exit(&cpu_lock); 135 136 /* 137 * If DTrace helper tracing is enabled, we need to allocate the 138 * trace buffer and initialize the values. 139 */ 140 if (dtrace_helptrace_enabled) { 141 ASSERT(dtrace_helptrace_buffer == NULL); 142 dtrace_helptrace_buffer = 143 kmem_zalloc(dtrace_helptrace_bufsize, KM_SLEEP); 144 dtrace_helptrace_next = 0; 145 } 146 147 mutex_exit(&dtrace_lock); 148 mutex_exit(&dtrace_provider_lock); 149 150 mutex_enter(&cpu_lock); 151 152 /* Setup the boot CPU */ 153 (void) dtrace_cpu_setup(CPU_CONFIG, 0); 154 155 mutex_exit(&cpu_lock); 156 157 #if __FreeBSD_version < 800039 158 /* Enable device cloning. */ 159 clone_setup(&dtrace_clones); 160 161 /* Setup device cloning events. */ 162 eh_tag = EVENTHANDLER_REGISTER(dev_clone, dtrace_clone, 0, 1000); 163 #else 164 dtrace_dev = make_dev(&dtrace_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "dtrace/dtrace"); 165 #endif 166 167 return; 168 } 169