diff options
Diffstat (limited to 'drivers/gpu/drm/drm_gem_ttm_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_gem_ttm_helper.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_gem_ttm_helper.c b/drivers/gpu/drm/drm_gem_ttm_helper.c index de28720757af..b14bed8be771 100644 --- a/drivers/gpu/drm/drm_gem_ttm_helper.c +++ b/drivers/gpu/drm/drm_gem_ttm_helper.c @@ -114,5 +114,38 @@ int drm_gem_ttm_mmap(struct drm_gem_object *gem, } EXPORT_SYMBOL(drm_gem_ttm_mmap); +/** + * drm_gem_ttm_dumb_map_offset() - Implements struct &drm_driver.dumb_map_offset + * @file: DRM file pointer. + * @dev: DRM device. + * @handle: GEM handle + * @offset: Returns the mapping's memory offset on success + * + * Provides an implementation of struct &drm_driver.dumb_map_offset for + * TTM-based GEM drivers. TTM allocates the offset internally and + * drm_gem_ttm_dumb_map_offset() returns it for dumb-buffer implementations. + * + * See struct &drm_driver.dumb_map_offset. + * + * Returns: + * 0 on success, or a negative errno code otherwise. + */ +int drm_gem_ttm_dumb_map_offset(struct drm_file *file, struct drm_device *dev, + uint32_t handle, uint64_t *offset) +{ + struct drm_gem_object *gem; + + gem = drm_gem_object_lookup(file, handle); + if (!gem) + return -ENOENT; + + *offset = drm_vma_node_offset_addr(&gem->vma_node); + + drm_gem_object_put(gem); + + return 0; +} +EXPORT_SYMBOL(drm_gem_ttm_dumb_map_offset); + MODULE_DESCRIPTION("DRM gem ttm helpers"); MODULE_LICENSE("GPL"); |