dtrace_unload.c

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

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FreeBSD/Linux Kernel Cross Reference sys/cddl/dev/dtrace/dtrace_unload.c

FreeBSD/Linux Kernel Cross Reference
sys/cddl/dev/dtrace/dtrace_unload.c