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drm/gem: Add drm_gem_dumb_map_offset() 

Add a common drm_driver.dumb_map_offset function for GEM backed drivers.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1500837417-40580-2-git-send-email-noralf@tronnes.org
zero-colors
Noralf Trønnes 2017-07-23 21:16:17 +02:00
parent 4e6b1e9125
commit db61152703
2 changed files with 37 additions and 0 deletions
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35
drivers/gpu/drm/drm_gem.c
View File

@ -310,6 +310,41 @@ 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

2
include/drm/drm_gem.h
View File

@ -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);