[Intel-gfx] [PATCH V2] drm/i915: Use I915_MAP_WC for execlists context buffer on the platforms without LLC

[Chris Wilson]

Quoting Zhao Yakui (2018-06-22 07:09:10)
> @@ -2728,6 +2729,7 @@ populate_lr_context(struct i915_gem_context *ctx,
>                     struct intel_engine_cs *engine,
>                     struct intel_ring *ring)
>  {
> +       enum i915_map_type map = HAS_LLC(ctx->i915) ? I915_MAP_WB : I915_MAP_WC;
>         void *vaddr;
>         u32 *regs;
>         int ret;
> @@ -2738,13 +2740,12 @@ populate_lr_context(struct i915_gem_context *ctx,
>                 return ret;
>         }
>  
> -       vaddr = i915_gem_object_pin_map(ctx_obj, I915_MAP_WB);
> +       vaddr = i915_gem_object_pin_map(ctx_obj, map);

As this uses the cpu domain and flushed afterwards, this one is correct
in its usage of MAP_WB.
-Chris