Add a common drm_driver.dumb_map_offset function for GEM backed drivers.
Signed-off-by: Noralf Trønnes noralf@tronnes.org --- drivers/gpu/drm/drm_gem.c | 35 +++++++++++++++++++++++++++++++++++ include/drm/drm_gem.h | 2 ++ 2 files changed, 37 insertions(+)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 5df028a..a8d396b 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -311,6 +311,41 @@ drm_gem_handle_delete(struct drm_file *filp, u32 handle) EXPORT_SYMBOL(drm_gem_handle_delete);
/** + * drm_gem_dumb_map_offset - return the fake mmap offset for a gem object + * @file: drm file-private structure containing the gem object + * @dev: corresponding drm_device + * @handle: gem object handle + * @offset: return location for the fake mmap offset + * + * This implements the &drm_driver.dumb_map_offset kms driver callback for + * drivers which use gem to manage their backing storage. + * + * Returns: + * 0 on success or a negative error code on failure. + */ +int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, + u32 handle, u64 *offset) +{ + struct drm_gem_object *obj; + int ret; + + obj = drm_gem_object_lookup(file, handle); + if (!obj) + return -ENOENT; + + ret = drm_gem_create_mmap_offset(obj); + if (ret) + goto out; + + *offset = drm_vma_node_offset_addr(&obj->vma_node); +out: + drm_gem_object_put_unlocked(obj); + + return ret; +} +EXPORT_SYMBOL_GPL(drm_gem_dumb_map_offset); + +/** * drm_gem_dumb_destroy - dumb fb callback helper for gem based drivers * @file: drm file-private structure to remove the dumb handle from * @dev: corresponding drm_device diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index 4a9d231..9c55c2a 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -302,6 +302,8 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, bool dirty, bool accessed);
struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle); +int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, + u32 handle, u64 *offset); int drm_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev, uint32_t handle);