The helper drm_gem_shmem_create_object_cached() allocates an GEM SHMEM object and sets the map_cached flag. Useful for drivers that want cached mappings.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de --- drivers/gpu/drm/drm_gem_shmem_helper.c | 27 ++++++++++++++++++++++++++ include/drm/drm_gem_shmem_helper.h | 4 ++++ 2 files changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index df31e5782eed1..ab28b7ff864cb 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -433,6 +433,33 @@ bool drm_gem_shmem_purge(struct drm_gem_object *obj) } EXPORT_SYMBOL(drm_gem_shmem_purge);
+/** + * drm_gem_shmem_create_object_cached - Create a shmem buffer object with + * cached mappings + * @dev: DRM device + * @size: Size of the object to allocate + * + * By default, shmem buffer objects use writecombine mappings. This + * function implements struct drm_driver.gem_create_object for shmem + * buffer objects with cached mappings. + * + * Returns: + * A struct drm_gem_shmem_object * on success or NULL negative on failure. + */ +struct drm_gem_object * +drm_gem_shmem_create_object_cached(struct drm_device *dev, size_t size) +{ + struct drm_gem_shmem_object *shmem; + + shmem = kzalloc(sizeof(*shmem), GFP_KERNEL); + if (!shmem) + return NULL; + shmem->map_cached = true; + + return &shmem->base; +} +EXPORT_SYMBOL(drm_gem_shmem_create_object_cached); + /** * drm_gem_shmem_dumb_create - Create a dumb shmem buffer object * @file: DRM file structure to create the dumb buffer for diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h index 294b2931c4cc0..5381f0c8cf6f6 100644 --- a/include/drm/drm_gem_shmem_helper.h +++ b/include/drm/drm_gem_shmem_helper.h @@ -132,6 +132,10 @@ struct drm_gem_shmem_object * drm_gem_shmem_create_with_handle(struct drm_file *file_priv, struct drm_device *dev, size_t size, uint32_t *handle); + +struct drm_gem_object * +drm_gem_shmem_create_object_cached(struct drm_device *dev, size_t size); + int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args);