drm_global.c

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    1 /**************************************************************************
    2  *
    3  * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
    4  * All Rights Reserved.
    5  *
    6  * Permission is hereby granted, free of charge, to any person obtaining a
    7  * copy of this software and associated documentation files (the
    8  * "Software"), to deal in the Software without restriction, including
    9  * without limitation the rights to use, copy, modify, merge, publish,
   10  * distribute, sub license, and/or sell copies of the Software, and to
   11  * permit persons to whom the Software is furnished to do so, subject to
   12  * the following conditions:
   13  *
   14  * The above copyright notice and this permission notice (including the
   15  * next paragraph) shall be included in all copies or substantial portions
   16  * of the Software.
   17  *
   18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
   21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
   22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
   23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
   24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
   25  *
   26  **************************************************************************/
   27 /*
   28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <dev/drm2/drmP.h>
   35 #include <dev/drm2/drm_global.h>
   36 
   37 MALLOC_DEFINE(M_DRM_GLOBAL, "drm_global", "DRM Global Items");
   38 
   39 struct drm_global_item {
   40         struct sx mutex;
   41         void *object;
   42         int refcount;
   43 };
   44 
   45 static struct drm_global_item glob[DRM_GLOBAL_NUM];
   46 
   47 void drm_global_init(void)
   48 {
   49         int i;
   50 
   51         for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
   52                 struct drm_global_item *item = &glob[i];
   53                 sx_init(&item->mutex, "drmgi");
   54                 item->object = NULL;
   55                 item->refcount = 0;
   56         }
   57 }
   58 
   59 void drm_global_release(void)
   60 {
   61         int i;
   62         for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
   63                 struct drm_global_item *item = &glob[i];
   64                 MPASS(item->object == NULL);
   65                 MPASS(item->refcount == 0);
   66                 sx_destroy(&item->mutex);
   67         }
   68 }
   69 
   70 int drm_global_item_ref(struct drm_global_reference *ref)
   71 {
   72         int ret;
   73         struct drm_global_item *item = &glob[ref->global_type];
   74         void *object;
   75 
   76         sx_xlock(&item->mutex);
   77         if (item->refcount == 0) {
   78                 item->object = malloc(ref->size, M_DRM_GLOBAL,
   79                     M_NOWAIT | M_ZERO);
   80                 if (unlikely(item->object == NULL)) {
   81                         ret = -ENOMEM;
   82                         goto out_err;
   83                 }
   84 
   85                 ref->object = item->object;
   86                 ret = ref->init(ref);
   87                 if (unlikely(ret != 0))
   88                         goto out_err;
   89 
   90         }
   91         ++item->refcount;
   92         ref->object = item->object;
   93         object = item->object;
   94         sx_xunlock(&item->mutex);
   95         return 0;
   96 out_err:
   97         sx_xunlock(&item->mutex);
   98         item->object = NULL;
   99         return ret;
  100 }
  101 EXPORT_SYMBOL(drm_global_item_ref);
  102 
  103 void drm_global_item_unref(struct drm_global_reference *ref)
  104 {
  105         struct drm_global_item *item = &glob[ref->global_type];
  106 
  107         sx_xlock(&item->mutex);
  108         MPASS(item->refcount != 0);
  109         MPASS(ref->object == item->object);
  110         if (--item->refcount == 0) {
  111                 ref->release(ref);
  112                 free(item->object, M_DRM_GLOBAL);
  113                 item->object = NULL;
  114         }
  115         sx_xunlock(&item->mutex);
  116 }
  117 EXPORT_SYMBOL(drm_global_item_unref);

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FreeBSD/Linux Kernel Cross Reference sys/dev/drm2/drm_global.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/drm_global.c