[Intel-gfx] [PATCH] drm/i915/mtl: Update cache coherency setting for context structure

[Yang, Fei]

> As context structure is shared memory for CPU/GPU, Wa_22016122933 is
> needed for this memory block as well.
>
> Signed-off-by: Zhanjun Dong <zhanjun.dong at intel.com>
> CC: Fei Yang <fei.yang at intel.com>

Reviewed-by: Fei Yang <fei.yang at intel.com>

> ---
>  drivers/gpu/drm/i915/gt/intel_lrc.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index a4ec20aaafe2..1b710102390b 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -1092,8 +1092,15 @@ __lrc_alloc_state(struct intel_context *ce, struct intel_engine_cs *engine)
>
>          obj = i915_gem_object_create_lmem(engine->i915, context_size,
>                                            I915_BO_ALLOC_PM_VOLATILE);
> -       if (IS_ERR(obj))
> +       if (IS_ERR(obj)) {
>                  obj = i915_gem_object_create_shmem(engine->i915, context_size);
> +               /*
> +                * Wa_22016122933: For MTL the shared memory needs to be mapped
> +                * as WC on CPU side and UC (PAT index 2) on GPU side
> +                */
> +               if (IS_METEORLAKE(engine->i915))
> +                       i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
> +       }
>          if (IS_ERR(obj))
>                  return ERR_CAST(obj);
>
> --
> 2.34.1

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