Re: [Intel-gfx] [PATCH 1/2] drm/i915/gt: Do not use stolen on MTL

[Andrzej Hajda <andrzej.hajda@intel.com>]

On 30.06.2023 19:01, Nirmoy Das wrote:
> Use smem on MTL due to a HW bug in MTL that prevents
> reading from stolen memory using LMEM BAR.
>
> Cc: Oak Zeng <oak.zeng@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Andi Shyti <andi.shyti@linux.intel.com>
> Cc: Andrzej Hajda <andrzej.hajda@intel.com>
> Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>

Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>

Regards
Andrzej
> ---
>   drivers/gpu/drm/i915/gt/intel_gt.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
> index 33a61046ba58..9f64d61dd5fc 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt.c
> @@ -466,7 +466,7 @@ static int intel_gt_init_scratch(struct intel_gt *gt, unsigned int size)
>   	obj = i915_gem_object_create_lmem(i915, size,
>   					  I915_BO_ALLOC_VOLATILE |
>   					  I915_BO_ALLOC_GPU_ONLY);
> -	if (IS_ERR(obj))
> +	if (IS_ERR(obj) && !IS_METEORLAKE(i915)) /* Wa_22018444074 */
>   		obj = i915_gem_object_create_stolen(i915, size);
>   	if (IS_ERR(obj))
>   		obj = i915_gem_object_create_internal(i915, size);