[PATCH i-g-t v6 2/2] tests/xe_ccs: Update compression check based on flat-ccs enablement

[Zbigniew Kempczyński]

On Fri, Apr 19, 2024 at 08:36:17PM -0700, Akshata Jahagirdar wrote:
> In Xe2+ platforms,we need to run this test regardless of the status of flat-ccs.
> Check if the platform supports compression and has flat ccs enabled, and if it
> doesn't, then update the checks accordingly and proceed with the test.
> 
> Additionally, On Xe2 dGPU, compression is only supported with VRAM. When copying
> from VRAM -> sysmem the KMD uses mapping with uncompressed PAT so the copy
> in system memory is guaranteed to be uncompressed. When restoring such buffers
> from sysmem -> VRAM the KMD can't easily know which pages were originally
> compressed, so we always use uncompressed -> uncompressed here. so this means
> there's no need for extra CCS storage on such platforms.
> Thats why we shouldn't need to run suspend-resume on xe2 dgpu.
> 
> Signed-off-by: Akshata Jahagirdar <akshata.jahagirdar at intel.com>
> Acked-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
> ---
>  tests/intel/xe_ccs.c | 40 +++++++++++++++++++++++++++++++++-------
>  1 file changed, 33 insertions(+), 7 deletions(-)
> 
> diff --git a/tests/intel/xe_ccs.c b/tests/intel/xe_ccs.c
> index b3bf97af7..7b6cf231e 100644
> --- a/tests/intel/xe_ccs.c
> +++ b/tests/intel/xe_ccs.c
> @@ -114,10 +114,11 @@ static void surf_copy(int xe,
>  	uint32_t sysmem = system_memory(xe);
>  	uint8_t comp_pat_index = DEFAULT_PAT_INDEX;
>  	uint16_t cpu_caching = __xe_default_cpu_caching(xe, sysmem, 0);
> +	uint32_t devid = intel_get_drm_devid(xe);
>  	int result;
>  
>  	igt_assert(mid->compression);
> -	if (AT_LEAST_GEN(intel_get_drm_devid(xe), 20) && mid->compression) {
> +	if (AT_LEAST_GEN(devid, 20) && mid->compression) {
>  		comp_pat_index  = intel_get_pat_idx_uc_comp(xe);
>  		cpu_caching = DRM_XE_GEM_CPU_CACHING_WC;
>  	}
> @@ -162,8 +163,24 @@ static void surf_copy(int xe,
>  						      (void *)mid->ptr, mid->size);
>  
>  		munmap(ccsmap2, ccssize);
> -		igt_assert(!strcmp(orig, newsum));
> -		igt_assert(!strcmp(orig2, newsum2));
> +		if (blt_platform_has_flat_ccs_enabled(xe)) {
> +			if (IS_GEN(devid, 12) && is_intel_dgfx(xe)) {
> +				igt_assert(!strcmp(orig, newsum));
> +				igt_assert(!strcmp(orig2, newsum2));
> +			} else if (AT_LEAST_GEN(devid, 20)) {
> +				if (is_intel_dgfx(xe)) {
> +					/* buffer object would become
> +					 * uncompressed in xe2+ dgfx
> +					 */
> +					igt_assert(!blt_surface_is_compressed(xe, ctx,
> +							NULL, ahnd, mid));
> +				} else {
> +					/* ccs should be present in xe2+ igfx */
> +					igt_assert(blt_surface_is_compressed(xe, ctx,
> +							NULL, ahnd, mid));
> +				}
> +			}
> +		}
>  		g_free(orig);
>  		g_free(orig2);
>  		g_free(newsum);
> @@ -193,10 +210,18 @@ static void surf_copy(int xe,
>  	intel_ctx_xe_sync(ctx, true);
>  	WRITE_PNG(xe, run_id, "corrupted", &blt.dst, dst->x2, dst->y2, bpp);
>  	result = memcmp(src->ptr, dst->ptr, src->size);
> -	igt_assert(result != 0);
> +	if (!blt_platform_has_flat_ccs_enabled(xe))
> +		igt_assert(result != 0);

Why there's negation? If platorm has no flat ccs that means we have no
compression and src will equal dst.

>  
> -	/* retrieve back ccs */
> -	memcpy(ccsmap, ccscopy, ccssize);
> +	/* In case of suspend_resume, buffer object would become
> +	 * uncompressed in xe2+ dgfx, and therefore retrieve the
> +	 * ccs by copying 0 to ccsmap
> +	 */
> +	if (suspend_resume && AT_LEAST_GEN(devid, 20) && is_intel_dgfx(xe))
> +		memset(ccsmap, 0, ccssize);
> +	else
> +		/* retrieve back ccs */
> +		memcpy(ccsmap, ccscopy, ccssize);
>  	blt_ctrl_surf_copy(xe, ctx, NULL, ahnd, &surf);
>  
>  	blt_block_copy(xe, ctx, NULL, ahnd, &blt, &ext);
> @@ -365,7 +390,8 @@ static void block_copy(int xe,
>  	 * occurs and ctrl surface will be filled with some not-zeroed values.
>  	 */
>  	if (mid->compression && FROM_EXP_WH(width, height))
> -		igt_assert(blt_surface_is_compressed(xe, ctx, NULL, ahnd, mid));
> +		if (!blt_platform_has_flat_ccs_enabled(xe))
> +			igt_assert(blt_surface_is_compressed(xe, ctx, NULL, ahnd, mid));

Same here, we should check if surface is compressed when platform
has flat ccs turned on.

--
Zbigniew

>  
>  	WRITE_PNG(xe, run_id, "mid", &blt.dst, width, height, bpp);
>  
> -- 
> 2.34.1
>