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 #ifndef EARLY_AP_STARTUP 26 static void 27 dtrace_ap_start(void *dummy) 28 { 29 int i; 30 31 mutex_enter(&cpu_lock); 32 33 /* Setup the rest of the CPUs. */ 34 CPU_FOREACH(i) { 35 if (i == 0) 36 continue; 37 38 (void) dtrace_cpu_setup(CPU_CONFIG, i); 39 } 40 41 mutex_exit(&cpu_lock); 42 } 43 44 SYSINIT(dtrace_ap_start, SI_SUB_SMP, SI_ORDER_ANY, dtrace_ap_start, NULL); 45 #endif 46 47 static void 48 dtrace_load(void *dummy) 49 { 50 dtrace_provider_id_t id; 51 #ifdef EARLY_AP_STARTUP 52 int i; 53 #endif 54 55 #ifndef illumos 56 /* 57 * DTrace uses negative logic for the destructive mode switch, so it 58 * is required to translate from the sysctl which uses positive logic. 59 */ 60 if (dtrace_allow_destructive) 61 dtrace_destructive_disallow = 0; 62 else 63 dtrace_destructive_disallow = 1; 64 #endif 65 66 /* Hook into the trap handler. */ 67 dtrace_trap_func = dtrace_trap; 68 69 /* Hang our hook for thread switches. */ 70 dtrace_vtime_switch_func = dtrace_vtime_switch; 71 72 /* Hang our hook for exceptions. */ 73 dtrace_invop_init(); 74 75 dtrace_taskq = taskq_create("dtrace_taskq", 1, maxclsyspri, 0, 0, 0); 76 77 dtrace_arena = new_unrhdr(1, INT_MAX, &dtrace_unr_mtx); 78 79 /* Register callbacks for linker file load and unload events. */ 80 dtrace_kld_load_tag = EVENTHANDLER_REGISTER(kld_load, 81 dtrace_kld_load, NULL, EVENTHANDLER_PRI_ANY); 82 dtrace_kld_unload_try_tag = EVENTHANDLER_REGISTER(kld_unload_try, 83 dtrace_kld_unload_try, NULL, EVENTHANDLER_PRI_ANY); 84 85 /* 86 * Initialise the mutexes without 'witness' because the dtrace 87 * code is mostly written to wait for memory. To have the 88 * witness code change a malloc() from M_WAITOK to M_NOWAIT 89 * because a lock is held would surely create a panic in a 90 * low memory situation. And that low memory situation might be 91 * the very problem we are trying to trace. 92 */ 93 mutex_init(&dtrace_lock,"dtrace probe state", MUTEX_DEFAULT, NULL); 94 mutex_init(&dtrace_provider_lock,"dtrace provider state", MUTEX_DEFAULT, NULL); 95 mutex_init(&dtrace_meta_lock,"dtrace meta-provider state", MUTEX_DEFAULT, NULL); 96 #ifdef DEBUG 97 mutex_init(&dtrace_errlock,"dtrace error lock", MUTEX_DEFAULT, NULL); 98 #endif 99 100 mutex_enter(&cpu_lock); 101 mutex_enter(&dtrace_provider_lock); 102 mutex_enter(&dtrace_lock); 103 104 dtrace_state_cache = kmem_cache_create("dtrace_state_cache", 105 sizeof (dtrace_dstate_percpu_t) * NCPU, DTRACE_STATE_ALIGN, 106 NULL, NULL, NULL, NULL, NULL, 0); 107 108 ASSERT(MUTEX_HELD(&cpu_lock)); 109 dtrace_bymod = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_mod), 110 offsetof(dtrace_probe_t, dtpr_nextmod), 111 offsetof(dtrace_probe_t, dtpr_prevmod)); 112 113 dtrace_byfunc = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_func), 114 offsetof(dtrace_probe_t, dtpr_nextfunc), 115 offsetof(dtrace_probe_t, dtpr_prevfunc)); 116 117 dtrace_byname = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_name), 118 offsetof(dtrace_probe_t, dtpr_nextname), 119 offsetof(dtrace_probe_t, dtpr_prevname)); 120 121 if (dtrace_retain_max < 1) { 122 cmn_err(CE_WARN, "illegal value (%zu) for dtrace_retain_max; " 123 "setting to 1", dtrace_retain_max); 124 dtrace_retain_max = 1; 125 } 126 127 /* 128 * Now discover our toxic ranges. 129 */ 130 dtrace_toxic_ranges(dtrace_toxrange_add); 131 132 /* 133 * Before we register ourselves as a provider to our own framework, 134 * we would like to assert that dtrace_provider is NULL -- but that's 135 * not true if we were loaded as a dependency of a DTrace provider. 136 * Once we've registered, we can assert that dtrace_provider is our 137 * pseudo provider. 138 */ 139 (void) dtrace_register("dtrace", &dtrace_provider_attr, 140 DTRACE_PRIV_NONE, 0, &dtrace_provider_ops, NULL, &id); 141 142 ASSERT(dtrace_provider != NULL); 143 ASSERT((dtrace_provider_id_t)dtrace_provider == id); 144 145 dtrace_probeid_begin = dtrace_probe_create((dtrace_provider_id_t) 146 dtrace_provider, NULL, NULL, "BEGIN", 0, NULL); 147 dtrace_probeid_end = dtrace_probe_create((dtrace_provider_id_t) 148 dtrace_provider, NULL, NULL, "END", 0, NULL); 149 dtrace_probeid_error = dtrace_probe_create((dtrace_provider_id_t) 150 dtrace_provider, NULL, NULL, "ERROR", 1, NULL); 151 152 mutex_exit(&dtrace_lock); 153 mutex_exit(&dtrace_provider_lock); 154 155 #ifdef EARLY_AP_STARTUP 156 CPU_FOREACH(i) { 157 (void) dtrace_cpu_setup(CPU_CONFIG, i); 158 } 159 #else 160 /* Setup the boot CPU */ 161 (void) dtrace_cpu_setup(CPU_CONFIG, 0); 162 #endif 163 164 mutex_exit(&cpu_lock); 165 166 dtrace_dev = make_dev(&dtrace_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, 167 "dtrace/dtrace"); 168 helper_dev = make_dev(&helper_cdevsw, 0, UID_ROOT, GID_WHEEL, 0660, 169 "dtrace/helper"); 170 } 171