diff options
Diffstat (limited to 'drivers/gpu/drm/drm_global.c')
| -rw-r--r-- | drivers/gpu/drm/drm_global.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/drivers/gpu/drm/drm_global.c b/drivers/gpu/drm/drm_global.c deleted file mode 100644 index 5799e2782dd1..000000000000 --- a/drivers/gpu/drm/drm_global.c +++ /dev/null @@ -1,137 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 OR MIT -/************************************************************************** - * - * Copyright 2008-2009 VMware, Inc., Palo Alto, CA., USA - * - * 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); - } -} - -/** - * drm_global_item_ref - Initialize and acquire reference to memory - * object - * @ref: Object for initialization - * - * This initializes a memory object, allocating memory and calling the - * .init() hook. Further calls will increase the reference count for - * that item. - * - * Returns: - * Zero on success, non-zero otherwise. - */ -int drm_global_item_ref(struct drm_global_reference *ref) -{ - int ret = 0; - struct drm_global_item *item = &glob[ref->global_type]; - - mutex_lock(&item->mutex); - if (item->refcount == 0) { - ref->object = kzalloc(ref->size, GFP_KERNEL); - if (unlikely(ref->object == NULL)) { - ret = -ENOMEM; - goto error_unlock; - } - ret = ref->init(ref); - if (unlikely(ret != 0)) - goto error_free; - - item->object = ref->object; - } else { - ref->object = item->object; - } - - ++item->refcount; - mutex_unlock(&item->mutex); - return 0; - -error_free: - kfree(ref->object); - ref->object = NULL; -error_unlock: - mutex_unlock(&item->mutex); - return ret; -} -EXPORT_SYMBOL(drm_global_item_ref); - -/** - * drm_global_item_unref - Drop reference to memory - * object - * @ref: Object being removed - * - * Drop a reference to the memory object and eventually call the - * release() hook. The allocated object should be dropped in the - * release() hook or before calling this function - * - */ - -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); - |