From db61152703c64133e42b8c720a83ff36e1824bb1 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Noralf=20Tr=C3=B8nnes?= Date: Sun, 23 Jul 2017 21:16:17 +0200 Subject: [PATCH] drm/gem: Add drm_gem_dumb_map_offset() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Add a common drm_driver.dumb_map_offset function for GEM backed drivers. Signed-off-by: Noralf Trønnes Reviewed-by: Philipp Zabel Reviewed-by: Laurent Pinchart Reviewed-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/1500837417-40580-2-git-send-email-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 5df028a6dd9f..a8d396bed6a4 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -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 diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index 4a9d231b4294..9c55c2acaa2b 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); -- 2.20.1