[PATCH] drm/i915/selftests: Set always_coherent to false when reading from CPU

[Cavitt, Jonathan]

-----Original Message-----
From: Das, Nirmoy <nirmoy.das at intel.com> 
Sent: Thursday, May 16, 2024 8:14 AM
To: intel-gfx at lists.freedesktop.org
Cc: dri-devel at lists.freedesktop.org; Das, Nirmoy <nirmoy.das at intel.com>; Andi Shyti <andi.shyti at linux.intel.com>; Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>; Cavitt, Jonathan <jonathan.cavitt at intel.com>
Subject: [PATCH] drm/i915/selftests: Set always_coherent to false when reading from CPU
> 
> The previous commit 'commit 8d4ba9fc1c6c ("drm/i915/selftests: Pick
> correct caching mode.")' was not complete as for non LLC  sharing platforms
> cpu read can happen from LLC which probably doesn't have the latest
> changes made by GPU.
> 
> Cc: Andi Shyti <andi.shyti at linux.intel.com>
> Cc: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
> Cc: Jonathan Cavitt <jonathan.cavitt at intel.com>
> Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>

I see no problem with this
Reviewed-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
-Jonathan Cavitt

> ---
>  drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
> index 65a931ea80e9..3527b8f446fe 100644
> --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
> +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
> @@ -196,7 +196,7 @@ static int verify_access(struct drm_i915_private *i915,
>  	if (err)
>  		goto out_file;
>  
> -	mode = intel_gt_coherent_map_type(to_gt(i915), native_obj, true);
> +	mode = intel_gt_coherent_map_type(to_gt(i915), native_obj, false);
>  	vaddr = i915_gem_object_pin_map_unlocked(native_obj, mode);
>  	if (IS_ERR(vaddr)) {
>  		err = PTR_ERR(vaddr);
> -- 
> 2.42.0
> 
>