[Mesa-dev] [PATCH] intel: Fix a case when mapping large texture fails

[Anuj Phogat]

On Mon 27 Feb 2012 11:45:46 AM PST, Anuj Phogat wrote:
> This patch handles a case when mapping a large texture fails
> in drm_intel_gem_bo_map_gtt(). These changes avoid assertion
> failure later in the driver as reported in following bugs:
>
> https://bugs.freedesktop.org/show_bug.cgi?id=44970
> https://bugs.freedesktop.org/show_bug.cgi?id=46303
>
> Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
> ---
>  src/mesa/drivers/dri/intel/intel_mipmap_tree.c |   26 ++++++++++++++++-------
>  src/mesa/drivers/dri/intel/intel_regions.c     |    7 ++++-
>  2 files changed, 23 insertions(+), 10 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
> index 5290da4..507702a 100644
> --- a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
> +++ b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
> @@ -702,15 +702,20 @@ intel_miptree_map_gtt(struct intel_context *intel,
>     y /= bh;
>  
>     base = intel_region_map(intel, mt->region, map->mode);
> -   /* Note that in the case of cube maps, the caller must have passed the slice
> -    * number referencing the face.
> -    */
> -   intel_miptree_get_image_offset(mt, level, 0, slice, &image_x, &image_y);
> -   x += image_x;
> -   y += image_y;
>  
> -   map->stride = mt->region->pitch * mt->cpp;
> -   map->ptr = base + y * map->stride + x * mt->cpp;
> +   if (base == NULL)
> +      map->ptr = NULL;
> +   else {
> +      /* Note that in the case of cube maps, the caller must have passed the
> +       * slice number referencing the face.
> +      */
> +      intel_miptree_get_image_offset(mt, level, 0, slice, &image_x, &image_y);
> +      x += image_x;
> +      y += image_y;
> +
> +      map->stride = mt->region->pitch * mt->cpp;
> +      map->ptr = base + y * map->stride + x * mt->cpp;
> +   }
>  
>     DBG("%s: %d,%d %dx%d from mt %p (%s) %d,%d = %p/%d\n", __FUNCTION__,
>         map->x, map->y, map->w, map->h,
> @@ -1063,6 +1068,11 @@ intel_miptree_map(struct intel_context *intel,
>  
>     *out_ptr = map->ptr;
>     *out_stride = map->stride;
> +
> +   if (map->ptr == NULL) {
> +      mt->level[level].slice[slice].map = NULL;
> +      free(map);
> +   }
>  }
>  
>  void
> diff --git a/src/mesa/drivers/dri/intel/intel_regions.c b/src/mesa/drivers/dri/intel/intel_regions.c
> index bc83649..982d6cb 100644
> --- a/src/mesa/drivers/dri/intel/intel_regions.c
> +++ b/src/mesa/drivers/dri/intel/intel_regions.c
> @@ -124,7 +124,7 @@ intel_region_map(struct intel_context *intel, struct intel_region *region,
>      */
>  
>     _DBG("%s %p\n", __FUNCTION__, region);
> -   if (!region->map_refcount++) {
> +   if (!region->map_refcount) {
>        intel_flush(&intel->ctx);
>  
>        if (region->tiling != I915_TILING_NONE)
> @@ -133,7 +133,10 @@ intel_region_map(struct intel_context *intel, struct intel_region *region,
>  	 drm_intel_bo_map(region->bo, true);
>  
>        region->map = region->bo->virtual;
> -      ++intel->num_mapped_regions;
> +      if (region->map) {
> +         ++intel->num_mapped_regions;
> +	 region->map_refcount++;
> +      }
>     }
>  
>     return region->map;

Any comments on this patch?