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/**************************************************************************
* Copyright (c) 2011, Intel Corporation.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
**************************************************************************/
#include <drm/drmP.h>
#include <drm/drm.h>
/**
* Initialize an already allocated GEM object of the specified size with
* no GEM provided backing store. Instead the caller is responsible for
* backing the object and handling it.
*/
int drm_gem_private_object_init(struct drm_device *dev,
struct drm_gem_object *obj, size_t size)
{
BUG_ON((size & (PAGE_SIZE - 1)) != 0);
obj->dev = dev;
obj->filp = NULL;
kref_init(&obj->refcount);
atomic_set(&obj->handle_count, 0);
obj->size = size;
return 0;
}
void drm_gem_object_release_wrap(struct drm_gem_object *obj)
{
/* Remove the list map if one is present */
if (obj->map_list.map) {
struct drm_gem_mm *mm = obj->dev->mm_private;
struct drm_map_list *list = &obj->map_list;
drm_ht_remove_item(&mm->offset_hash, &list->hash);
drm_mm_put_block(list->file_offset_node);
kfree(list->map);
list->map = NULL;
}
if (obj->filp)
drm_gem_object_release(obj);
}
/**
* gem_create_mmap_offset - invent an mmap offset
* @obj: our object
*
* Standard implementation of offset generation for mmap as is
* duplicated in several drivers. This belongs in GEM.
*/
int gem_create_mmap_offset(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct drm_gem_mm *mm = dev->mm_private;
struct drm_map_list *list;
struct drm_local_map *map;
int ret;
list = &obj->map_list;
list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
if (list->map == NULL)
return -ENOMEM;
map = list->map;
map->type = _DRM_GEM;
map->size = obj->size;
map->handle = obj;
list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
obj->size / PAGE_SIZE, 0, 0);
if (!list->file_offset_node) {
dev_err(dev->dev, "failed to allocate offset for bo %d\n",
obj->name);
ret = -ENOSPC;
goto free_it;
}
list->file_offset_node = drm_mm_get_block(list->file_offset_node,
obj->size / PAGE_SIZE, 0);
if (!list->file_offset_node) {
ret = -ENOMEM;
goto free_it;
}
list->hash.key = list->file_offset_node->start;
ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
if (ret) {
dev_err(dev->dev, "failed to add to map hash\n");
goto free_mm;
}
return 0;
free_mm:
drm_mm_put_block(list->file_offset_node);
free_it:
kfree(list->map);
list->map = NULL;
return ret;
}
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