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

[Andrzej Hajda]

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.z...@intel.com>
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Cc: Andi Shyti <andi.sh...@linux.intel.com>
Cc: Andrzej Hajda <andrzej.ha...@intel.com>
Signed-off-by: Nirmoy Das <nirmoy....@intel.com>

Reviewed-by: Andrzej Hajda <andrzej.ha...@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);