[PATCH v4 13/13] drm/vram-helper: Remove unused drm_gem_vram_{vmap,vunmap}()

[Daniel Vetter]

On Fri, Jan 08, 2021 at 10:43:40AM +0100, Thomas Zimmermann wrote:
> VRAM-helper BO's cannot be exported, so calls for vmap and vunmap
> can only come from the BO's drivers or a kernel client. These are
> supposed use vmap_local functionality.

	  ^to

> 
> The vmap and vunmap operations in VRAM helpers are therefore unused
> and can be removed.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

> ---
>  drivers/gpu/drm/drm_gem_vram_helper.c | 98 ---------------------------
>  include/drm/drm_gem_vram_helper.h     |  2 -
>  2 files changed, 100 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
> index c7fba3a0758e..c7d166cd16df 100644
> --- a/drivers/gpu/drm/drm_gem_vram_helper.c
> +++ b/drivers/gpu/drm/drm_gem_vram_helper.c
> @@ -379,72 +379,6 @@ int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo)
>  }
>  EXPORT_SYMBOL(drm_gem_vram_unpin);
>  
> -/**
> - * drm_gem_vram_vmap() - Pins and maps a GEM VRAM object into kernel address
> - *                       space
> - * @gbo: The GEM VRAM object to map
> - * @map: Returns the kernel virtual address of the VRAM GEM object's backing
> - *       store.
> - *
> - * The vmap function pins a GEM VRAM object to its current location, either
> - * system or video memory, and maps its buffer into kernel address space.
> - * As pinned object cannot be relocated, you should avoid pinning objects
> - * permanently. Call drm_gem_vram_vunmap() with the returned address to
> - * unmap and unpin the GEM VRAM object.
> - *
> - * Returns:
> - * 0 on success, or a negative error code otherwise.
> - */
> -int drm_gem_vram_vmap(struct drm_gem_vram_object *gbo, struct dma_buf_map *map)
> -{
> -	int ret;
> -
> -	ret = ttm_bo_reserve(&gbo->bo, true, false, NULL);
> -	if (ret)
> -		return ret;
> -
> -	ret = drm_gem_vram_pin_locked(gbo, 0);
> -	if (ret)
> -		goto err_ttm_bo_unreserve;
> -	ret = drm_gem_vram_vmap_local(gbo, map);
> -	if (ret)
> -		goto err_drm_gem_vram_unpin_locked;
> -
> -	ttm_bo_unreserve(&gbo->bo);
> -
> -	return 0;
> -
> -err_drm_gem_vram_unpin_locked:
> -	drm_gem_vram_unpin_locked(gbo);
> -err_ttm_bo_unreserve:
> -	ttm_bo_unreserve(&gbo->bo);
> -	return ret;
> -}
> -EXPORT_SYMBOL(drm_gem_vram_vmap);
> -
> -/**
> - * drm_gem_vram_vunmap() - Unmaps and unpins a GEM VRAM object
> - * @gbo: The GEM VRAM object to unmap
> - * @map: Kernel virtual address where the VRAM GEM object was mapped
> - *
> - * A call to drm_gem_vram_vunmap() unmaps and unpins a GEM VRAM buffer. See
> - * the documentation for drm_gem_vram_vmap() for more information.
> - */
> -void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, struct dma_buf_map *map)
> -{
> -	int ret;
> -
> -	ret = ttm_bo_reserve(&gbo->bo, false, false, NULL);
> -	if (WARN_ONCE(ret, "ttm_bo_reserve_failed(): ret=%d\n", ret))
> -		return;
> -
> -	drm_gem_vram_vunmap_local(gbo, map);
> -	drm_gem_vram_unpin_locked(gbo);
> -
> -	ttm_bo_unreserve(&gbo->bo);
> -}
> -EXPORT_SYMBOL(drm_gem_vram_vunmap);
> -
>  /**
>   * drm_gem_vram_vmap_local() - Maps a GEM VRAM object into kernel address space
>   * @gbo: The GEM VRAM object to map
> @@ -870,36 +804,6 @@ static void drm_gem_vram_object_unpin(struct drm_gem_object *gem)
>  	drm_gem_vram_unpin(gbo);
>  }
>  
> -/**
> - * drm_gem_vram_object_vmap() -
> - *	Implements &struct drm_gem_object_funcs.vmap
> - * @gem: The GEM object to map
> - * @map: Returns the kernel virtual address of the VRAM GEM object's backing
> - *       store.
> - *
> - * Returns:
> - * 0 on success, or a negative error code otherwise.
> - */
> -static int drm_gem_vram_object_vmap(struct drm_gem_object *gem, struct dma_buf_map *map)
> -{
> -	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
> -
> -	return drm_gem_vram_vmap(gbo, map);
> -}
> -
> -/**
> - * drm_gem_vram_object_vunmap() -
> - *	Implements &struct drm_gem_object_funcs.vunmap
> - * @gem: The GEM object to unmap
> - * @map: Kernel virtual address where the VRAM GEM object was mapped
> - */
> -static void drm_gem_vram_object_vunmap(struct drm_gem_object *gem, struct dma_buf_map *map)
> -{
> -	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
> -
> -	drm_gem_vram_vunmap(gbo, map);
> -}
> -
>  static int drm_gem_vram_object_vmap_local(struct drm_gem_object *gem, struct dma_buf_map *map)
>  {
>  	struct drm_gem_vram_object *gbo = drm_gem_vram_of_gem(gem);
> @@ -922,8 +826,6 @@ static const struct drm_gem_object_funcs drm_gem_vram_object_funcs = {
>  	.free = drm_gem_vram_object_free,
>  	.pin = drm_gem_vram_object_pin,
>  	.unpin = drm_gem_vram_object_unpin,
> -	.vmap = drm_gem_vram_object_vmap,
> -	.vunmap	= drm_gem_vram_object_vunmap,
>  	.vmap_local = drm_gem_vram_object_vmap_local,
>  	.vunmap_local = drm_gem_vram_object_vunmap_local,
>  	.mmap = drm_gem_ttm_mmap,
> diff --git a/include/drm/drm_gem_vram_helper.h b/include/drm/drm_gem_vram_helper.h
> index bd6a60e7c22b..e571867f4069 100644
> --- a/include/drm/drm_gem_vram_helper.h
> +++ b/include/drm/drm_gem_vram_helper.h
> @@ -97,8 +97,6 @@ u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo);
>  s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo);
>  int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag);
>  int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo);
> -int drm_gem_vram_vmap(struct drm_gem_vram_object *gbo, struct dma_buf_map *map);
> -void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, struct dma_buf_map *map);
>  int drm_gem_vram_vmap_local(struct drm_gem_vram_object *gbo, struct dma_buf_map *map);
>  void drm_gem_vram_vunmap_local(struct drm_gem_vram_object *gbo, struct dma_buf_map *map);
>  
> -- 
> 2.29.2
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch