Provides an implementation of struct drm_driver.dumb_map_offset that can be used by TTM-based GEM drivers.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- drivers/gpu/drm/drm_gem_ttm_helper.c | 33 ++++++++++++++++++++++++++++ include/drm/drm_gem_ttm_helper.h | 5 ++++- 2 files changed, 37 insertions(+), 1 deletion(-)
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"); diff --git a/include/drm/drm_gem_ttm_helper.h b/include/drm/drm_gem_ttm_helper.h index 7c6d874910b8..c1aa02bd4c89 100644 --- a/include/drm/drm_gem_ttm_helper.h +++ b/include/drm/drm_gem_ttm_helper.h @@ -5,8 +5,8 @@
#include <linux/kernel.h>
-#include <drm/drm_gem.h> #include <drm/drm_device.h> +#include <drm/drm_gem.h> #include <drm/ttm/ttm_bo_api.h> #include <drm/ttm/ttm_bo_driver.h>
@@ -24,4 +24,7 @@ void drm_gem_ttm_vunmap(struct drm_gem_object *gem, int drm_gem_ttm_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma);
+int drm_gem_ttm_dumb_map_offset(struct drm_file *file, struct drm_device *dev, + uint32_t handle, uint64_t *offset); + #endif