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drm/gem: add functions for mmap offset creation 

Signed-off-by: Rob Clark <rob@ti.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Rob Clark 2011-08-10 08:09:07 -05:00 committed by Dave Airlie
parent 302a8e8b06
commit 75ef8b3b9c
2 changed files with 91 additions and 0 deletions
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88
drivers/gpu/drm/drm_gem.c
View File

@ -285,6 +285,94 @@ again:
}
EXPORT_SYMBOL(drm_gem_handle_create);
/**
* drm_gem_free_mmap_offset - release a fake mmap offset for an object
* @obj: obj in question
*
* This routine frees fake offsets allocated by drm_gem_create_mmap_offset().
*/
void
drm_gem_free_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 = &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;
}
EXPORT_SYMBOL(drm_gem_free_mmap_offset);
/**
* drm_gem_create_mmap_offset - create a fake mmap offset for an object
* @obj: obj in question
*
* GEM memory mapping works by handing back to userspace a fake mmap offset
* it can use in a subsequent mmap(2) call. The DRM core code then looks
* up the object based on the offset and sets up the various memory mapping
* structures.
*
* This routine allocates and attaches a fake offset for @obj.
*/
int
drm_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 = 0;
/* Set the object up for mmap'ing */
list = &obj->map_list;
list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
if (!list->map)
return -ENOMEM;
map = list->map;
map->type = _DRM_GEM;
map->size = obj->size;
map->handle = obj;
/* Get a DRM GEM mmap offset allocated... */
list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
obj->size / PAGE_SIZE, 0, 0);
if (!list->file_offset_node) {
DRM_ERROR("failed to allocate offset for bo %d\n", obj->name);
ret = -ENOSPC;
goto out_free_list;
}
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 out_free_list;
}
list->hash.key = list->file_offset_node->start;
ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
if (ret) {
DRM_ERROR("failed to add to map hash\n");
goto out_free_mm;
}
return 0;
out_free_mm:
drm_mm_put_block(list->file_offset_node);
out_free_list:
kfree(list->map);
list->map = NULL;
return ret;
}
EXPORT_SYMBOL(drm_gem_create_mmap_offset);
/** Returns a reference to the object named by the handle. */
struct drm_gem_object *
drm_gem_object_lookup(struct drm_device *dev, struct drm_file *filp,

3
include/drm/drmP.h
View File

@ -1624,6 +1624,9 @@ drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj)
drm_gem_object_unreference_unlocked(obj);
}
void drm_gem_free_mmap_offset(struct drm_gem_object *obj);
int drm_gem_create_mmap_offset(struct drm_gem_object *obj);
struct drm_gem_object *drm_gem_object_lookup(struct drm_device *dev,
struct drm_file *filp,
u32 handle);