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 23 #ifndef EARLY_AP_STARTUP 24 static void 25 dtrace_ap_start(void *dummy) 26 { 27 int i; 28 29 mutex_enter(&cpu_lock); 30 31 /* Setup the rest of the CPUs. */ 32 CPU_FOREACH(i) { 33 if (i == 0) 34 continue; 35 36 (void) dtrace_cpu_setup(CPU_CONFIG, i); 37 } 38 39 mutex_exit(&cpu_lock); 40 } 41 42 SYSINIT(dtrace_ap_start, SI_SUB_SMP, SI_ORDER_ANY, dtrace_ap_start, NULL); 43 #endif 44 45 static void 46 dtrace_load(void *dummy) 47 { 48 dtrace_provider_id_t id; 49 #ifdef EARLY_AP_STARTUP 50 int i; 51 #endif 52 53 #ifndef illumos 54 /* 55 * DTrace uses negative logic for the destructive mode switch, so it 56 * is required to translate from the sysctl which uses positive logic. 57 */ 58 if (dtrace_allow_destructive) 59 dtrace_destructive_disallow = 0; 60 else 61 dtrace_destructive_disallow = 1; 62 #endif 63 64 /* Hook into the trap handler. */ 65 dtrace_trap_func = dtrace_trap; 66 67 /* Hang our hook for thread switches. */ 68 dtrace_vtime_switch_func = dtrace_vtime_switch; 69 70 /* Hang our hook for exceptions. */ 71 dtrace_invop_init(); 72 73 dtrace_taskq = taskq_create("dtrace_taskq", 1, maxclsyspri, 0, 0, 0); 74 75 dtrace_arena = new_unrhdr(1, INT_MAX, &dtrace_unr_mtx); 76 77 /* Register callbacks for linker file load and unload events. */ 78 dtrace_kld_load_tag = EVENTHANDLER_REGISTER(kld_load, 79 dtrace_kld_load, NULL, EVENTHANDLER_PRI_ANY); 80 dtrace_kld_unload_try_tag = EVENTHANDLER_REGISTER(kld_unload_try, 81 dtrace_kld_unload_try, NULL, EVENTHANDLER_PRI_ANY); 82 83 /* 84 * Initialise the mutexes without 'witness' because the dtrace 85 * code is mostly written to wait for memory. To have the 86 * witness code change a malloc() from M_WAITOK to M_NOWAIT 87 * because a lock is held would surely create a panic in a 88 * low memory situation. And that low memory situation might be 89 * the very problem we are trying to trace. 90 */ 91 mutex_init(&dtrace_lock,"dtrace probe state", MUTEX_DEFAULT, NULL); 92 mutex_init(&dtrace_provider_lock,"dtrace provider state", MUTEX_DEFAULT, NULL); 93 mutex_init(&dtrace_meta_lock,"dtrace meta-provider state", MUTEX_DEFAULT, NULL); 94 #ifdef DEBUG 95 mutex_init(&dtrace_errlock,"dtrace error lock", MUTEX_DEFAULT, NULL); 96 #endif 97 98 mutex_enter(&cpu_lock); 99 mutex_enter(&dtrace_provider_lock); 100 mutex_enter(&dtrace_lock); 101 102 dtrace_state_cache = kmem_cache_create("dtrace_state_cache", 103 sizeof (dtrace_dstate_percpu_t) * NCPU, DTRACE_STATE_ALIGN, 104 NULL, NULL, NULL, NULL, NULL, 0); 105 106 ASSERT(MUTEX_HELD(&cpu_lock)); 107 dtrace_bymod = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_mod), 108 offsetof(dtrace_probe_t, dtpr_nextmod), 109 offsetof(dtrace_probe_t, dtpr_prevmod)); 110 111 dtrace_byfunc = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_func), 112 offsetof(dtrace_probe_t, dtpr_nextfunc), 113 offsetof(dtrace_probe_t, dtpr_prevfunc)); 114 115 dtrace_byname = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_name), 116 offsetof(dtrace_probe_t, dtpr_nextname), 117 offsetof(dtrace_probe_t, dtpr_prevname)); 118 119 if (dtrace_retain_max < 1) { 120 cmn_err(CE_WARN, "illegal value (%zu) for dtrace_retain_max; " 121 "setting to 1", dtrace_retain_max); 122 dtrace_retain_max = 1; 123 } 124 125 /* 126 * Now discover our toxic ranges. 127 */ 128 dtrace_toxic_ranges(dtrace_toxrange_add); 129 130 /* 131 * Before we register ourselves as a provider to our own framework, 132 * we would like to assert that dtrace_provider is NULL -- but that's 133 * not true if we were loaded as a dependency of a DTrace provider. 134 * Once we've registered, we can assert that dtrace_provider is our 135 * pseudo provider. 136 */ 137 (void) dtrace_register("dtrace", &dtrace_provider_attr, 138 DTRACE_PRIV_NONE, 0, &dtrace_provider_ops, NULL, &id); 139 140 ASSERT(dtrace_provider != NULL); 141 ASSERT((dtrace_provider_id_t)dtrace_provider == id); 142 143 dtrace_probeid_begin = dtrace_probe_create((dtrace_provider_id_t) 144 dtrace_provider, NULL, NULL, "BEGIN", 0, NULL); 145 dtrace_probeid_end = dtrace_probe_create((dtrace_provider_id_t) 146 dtrace_provider, NULL, NULL, "END", 0, NULL); 147 dtrace_probeid_error = dtrace_probe_create((dtrace_provider_id_t) 148 dtrace_provider, NULL, NULL, "ERROR", 1, NULL); 149 150 mutex_exit(&dtrace_lock); 151 mutex_exit(&dtrace_provider_lock); 152 153 #ifdef EARLY_AP_STARTUP 154 CPU_FOREACH(i) { 155 (void) dtrace_cpu_setup(CPU_CONFIG, i); 156 } 157 #else 158 /* Setup the boot CPU */ 159 (void) dtrace_cpu_setup(CPU_CONFIG, 0); 160 #endif 161 162 mutex_exit(&cpu_lock); 163 164 dtrace_dev = make_dev(&dtrace_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, 165 "dtrace/dtrace"); 166 helper_dev = make_dev(&helper_cdevsw, 0, UID_ROOT, GID_WHEEL, 0660, 167 "dtrace/helper"); 168 } 169