[PATCH 01/41] drm/gem: Add drm_gem_dumb_map_offset()

[Sean Paul]

On Sun, Jul 23, 2017 at 09:16:17PM +0200, Noralf Trønnes wrote:
> Add a common drm_driver.dumb_map_offset function for GEM backed drivers.
> 
> Signed-off-by: Noralf Trønnes <noralf at tronnes.org>

Reviewed-by: Sean Paul <seanpaul at chromium.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 5df028a..a8d396b 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
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index 4a9d231..9c55c2a 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);
> -- 
> 2.7.4
> 
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-- 
Sean Paul, Software Engineer, Google / Chromium OS