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- /**************************************************************************
- *
- * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sub license, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice (including the
- * next paragraph) shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- **************************************************************************/
- /*
- * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
- */
- #include <linux/mutex.h>
- #include <linux/slab.h>
- #include <linux/module.h>
- #include <drm/drm_global.h>
- struct drm_global_item {
- struct mutex mutex;
- void *object;
- int refcount;
- };
- static struct drm_global_item glob[DRM_GLOBAL_NUM];
- void drm_global_init(void)
- {
- int i;
- for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
- struct drm_global_item *item = &glob[i];
- mutex_init(&item->mutex);
- item->object = NULL;
- item->refcount = 0;
- }
- }
- void drm_global_release(void)
- {
- int i;
- for (i = 0; i < DRM_GLOBAL_NUM; ++i) {
- struct drm_global_item *item = &glob[i];
- BUG_ON(item->object != NULL);
- BUG_ON(item->refcount != 0);
- }
- }
- int drm_global_item_ref(struct drm_global_reference *ref)
- {
- int ret;
- struct drm_global_item *item = &glob[ref->global_type];
- mutex_lock(&item->mutex);
- if (item->refcount == 0) {
- item->object = kzalloc(ref->size, GFP_KERNEL);
- if (unlikely(item->object == NULL)) {
- ret = -ENOMEM;
- goto out_err;
- }
- ref->object = item->object;
- ret = ref->init(ref);
- if (unlikely(ret != 0))
- goto out_err;
- }
- ++item->refcount;
- ref->object = item->object;
- mutex_unlock(&item->mutex);
- return 0;
- out_err:
- mutex_unlock(&item->mutex);
- item->object = NULL;
- return ret;
- }
- EXPORT_SYMBOL(drm_global_item_ref);
- void drm_global_item_unref(struct drm_global_reference *ref)
- {
- struct drm_global_item *item = &glob[ref->global_type];
- mutex_lock(&item->mutex);
- BUG_ON(item->refcount == 0);
- BUG_ON(ref->object != item->object);
- if (--item->refcount == 0) {
- ref->release(ref);
- item->object = NULL;
- }
- mutex_unlock(&item->mutex);
- }
- EXPORT_SYMBOL(drm_global_item_unref);
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