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| author | Noralf Trønnes <noralf@tronnes.org> | 2017-07-23 21:16:17 +0200 |
|---|---|---|
| committer | Noralf Trønnes <noralf@tronnes.org> | 2017-07-29 13:49:55 +0200 |
| commit | db61152703c64133e42b8c720a83ff36e1824bb1 (patch) | |
| tree | 6f02f669dd2a9c59cf76a7e4e793a0ed0282aab0 /drivers/gpu/drm/drm_gem.c | |
| parent | drm/vc4: Convert more lock requirement comments to lockdep assertions. (diff) | |
| download | linux-db61152703c64133e42b8c720a83ff36e1824bb1.tar.xz linux-db61152703c64133e42b8c720a83ff36e1824bb1.zip | |
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
Diffstat (limited to 'drivers/gpu/drm/drm_gem.c')
| -rw-r--r-- | drivers/gpu/drm/drm_gem.c | 35 |
1 files changed, 35 insertions, 0 deletions
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 @@ -311,6 +311,41 @@ 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 * @dev: corresponding drm_device |