sys/cddl/dev/dtrace/dtrace_unload.c

   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 int
  26 dtrace_unload()
  27 {
  28         dtrace_state_t *state;
  29         int error = 0;
  30
  31         destroy_dev(dtrace_dev);
  32
  33         mutex_enter(&dtrace_provider_lock);
  34         mutex_enter(&dtrace_lock);
  35         mutex_enter(&cpu_lock);
  36
  37         ASSERT(dtrace_opens == 0);
  38
  39         if (dtrace_helpers > 0) {
  40                 mutex_exit(&cpu_lock);
  41                 mutex_exit(&dtrace_lock);
  42                 mutex_exit(&dtrace_provider_lock);
  43                 return (EBUSY);
  44         }
  45
  46         if (dtrace_unregister((dtrace_provider_id_t)dtrace_provider) != 0) {
  47                 mutex_exit(&cpu_lock);
  48                 mutex_exit(&dtrace_lock);
  49                 mutex_exit(&dtrace_provider_lock);
  50                 return (EBUSY);
  51         }
  52
  53         dtrace_provider = NULL;
  54
  55         if ((state = dtrace_anon_grab()) != NULL) {
  56                 /*
  57                  * If there were ECBs on this state, the provider should
  58                  * have not been allowed to detach; assert that there is
  59                  * none.
  60                  */
  61                 ASSERT(state->dts_necbs == 0);
  62                 dtrace_state_destroy(state);
  63         }
  64
  65         bzero(&dtrace_anon, sizeof (dtrace_anon_t));
  66
  67         mutex_exit(&cpu_lock);
  68
  69         if (dtrace_helptrace_enabled) {
  70                 kmem_free(dtrace_helptrace_buffer, 0);
  71                 dtrace_helptrace_buffer = NULL;
  72         }
  73
  74         if (dtrace_probes != NULL) {
  75                 kmem_free(dtrace_probes, 0);
  76                 dtrace_probes = NULL;
  77                 dtrace_nprobes = 0;
  78         }
  79
  80         dtrace_hash_destroy(dtrace_bymod);
  81         dtrace_hash_destroy(dtrace_byfunc);
  82         dtrace_hash_destroy(dtrace_byname);
  83         dtrace_bymod = NULL;
  84         dtrace_byfunc = NULL;
  85         dtrace_byname = NULL;
  86
  87         kmem_cache_destroy(dtrace_state_cache);
  88
  89         delete_unrhdr(dtrace_arena);
  90
  91         if (dtrace_toxrange != NULL) {
  92                 kmem_free(dtrace_toxrange, 0);
  93                 dtrace_toxrange = NULL;
  94                 dtrace_toxranges = 0;
  95                 dtrace_toxranges_max = 0;
  96         }
  97
  98         ASSERT(dtrace_vtime_references == 0);
  99         ASSERT(dtrace_opens == 0);
 100         ASSERT(dtrace_retained == NULL);
 101
 102         mutex_exit(&dtrace_lock);
 103         mutex_exit(&dtrace_provider_lock);
 104
 105         mutex_destroy(&dtrace_meta_lock);
 106         mutex_destroy(&dtrace_provider_lock);
 107         mutex_destroy(&dtrace_lock);
 108         mutex_destroy(&dtrace_errlock);
 109
 110         /* XXX Hack */
 111         mutex_destroy(&mod_lock);
 112
 113         /* Reset our hook for exceptions. */
 114         dtrace_invop_uninit();
 115
 116         /*
 117          * Reset our hook for thread switches, but ensure that vtime isn't
 118          * active first.
 119          */
 120         dtrace_vtime_active = 0;
 121         dtrace_vtime_switch_func = NULL;
 122
 123         /* Unhook from the trap handler. */
 124         dtrace_trap_func = NULL;
 125
 126         return (error);
 127 }