[igt-dev] [PATCH i-g-t 6/6] for-ci: Check for ccs remap support

[Zbigniew Kempczyński]

On Fri, Aug 27, 2021 at 05:57:56PM +0300, Imre Deak wrote:
> Remove the power-of-two stride size restriction only if there is a
> kernel support for this.
> 
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
>  lib/igt_fb.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 60 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/igt_fb.c b/lib/igt_fb.c
> index 72291f4f7..e729703d9 100644
> --- a/lib/igt_fb.c
> +++ b/lib/igt_fb.c
> @@ -715,6 +715,55 @@ void igt_init_fb(struct igt_fb *fb, int fd, int width, int height,
>  	}
>  }
>  
> +static bool adlp_ccs_remap_supported(int drm_fd)
> +{
> +	uint64_t modifier = I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS;
> +	uint64_t size;
> +	uint32_t width = 48 * 32;	/* Min stride with remapping to 48->64 tiles */
> +	uint32_t height = 32 * 32;	/* 4 tile aligned height */
> +	uint32_t format = DRM_FORMAT_XRGB8888;
> +	uint32_t strides[4] = {};
> +	uint32_t offsets[4] = {};
> +	uint32_t bo;
> +	uint32_t fb_id;
> +	static int supported = -1;

Just for making sure - 'supported' is kernel feature or behavior 
for specific gen? For latter case it shouldn't be cached.

--
Zbigniew 

> +
> +	if (supported != -1)
> +		return supported;
> +
> +	strides[0] = width * 4;
> +	strides[1] = roundup_power_of_two(strides[0] / 512) * 64;
> +
> +	offsets[0] = 0;
> +	/* Ensure CCS plane 1 is misaligned. */
> +	offsets[1] = ALIGN(offsets[0] + strides[0] * height, 2 * 1024 * 1024) + 4096;
> +
> +	size = offsets[1] + strides[1] * height / 32;
> +
> +	bo = gem_buffer_create_fb_obj(drm_fd, size);
> +	igt_assert(bo);
> +
> +	if (__kms_addfb(drm_fd, bo,
> +			width, height,
> +			format, modifier,
> +			strides, offsets,
> +			2,
> +			DRM_MODE_FB_MODIFIERS, &fb_id) != 0) {
> +		supported = 0;
> +		igt_debug("CCS framebuffer remapping not supported.\n");
> +
> +		return false;
> +	}
> +
> +	igt_ioctl(drm_fd, DRM_IOCTL_MODE_RMFB, &fb_id);
> +	gem_close(drm_fd, bo);
> +
> +	supported = 1;
> +	igt_debug("CCS framebuffer remapping supported\n");
> +
> +	return true;
> +}
> +
>  static uint32_t calc_plane_stride(struct igt_fb *fb, int plane)
>  {
>  	uint32_t min_stride = fb->plane_width[plane] *
> @@ -786,7 +835,7 @@ static uint32_t calc_plane_stride(struct igt_fb *fb, int plane)
>  				     &tile_width, &tile_height);
>  
>  		if (is_gen12_ccs_modifier(fb->modifier)) {
> -			if (IS_ALDERLAKE_P(intel_get_drm_devid(fb->fd)))
> +			if (IS_ALDERLAKE_P(intel_get_drm_devid(fb->fd))) {
>  				/*
>  				 * The main surface stride must be aligned to the CCS AUX
>  				 * page table block size (covered by one AUX PTE). This
> @@ -796,8 +845,13 @@ static uint32_t calc_plane_stride(struct igt_fb *fb, int plane)
>  				 * tile rows.
>  				 */
>  				tile_align = (min_stride <= 8 * tile_width) ? 8 : 16;
> -			else
> +				if (!adlp_ccs_remap_supported(fb->fd)) {
> +					tile_align = roundup_power_of_two(min_stride) / 128;
> +					tile_align = max(tile_align, 8);
> +				}
> +			} else {
>  				tile_align = 4;
> +			}
>  		}
>  
>  		return ALIGN(min_stride, tile_width * tile_align);
> @@ -848,7 +902,8 @@ static uint64_t calc_plane_size(struct igt_fb *fb, int plane)
>  		 * On ADL_P CCS color planes must be 2MB aligned, until remapping
>  		 * support is added for CCS FBs.
>  		 */
> -		if (IS_ALDERLAKE_P(intel_get_drm_devid(fb->fd)))
> +		if (IS_ALDERLAKE_P(intel_get_drm_devid(fb->fd)) &&
> +		    !adlp_ccs_remap_supported(fb->fd))
>  			size = ALIGN(size, 2 * 1024 * 1024);
>  
>  		return size;
> @@ -870,9 +925,9 @@ static uint64_t calc_plane_size(struct igt_fb *fb, int plane)
>  		 * On ADL_P CCS color planes must be 2MB aligned, until remapping
>  		 * support is added for CCS FBs.
>  		 */
> -		if (is_i915_device(fb->fd) &&
> +		if (is_ccs_modifier(fb->modifier) &&
>  		    IS_ALDERLAKE_P(intel_get_drm_devid(fb->fd)) &&
> -		    is_ccs_modifier(fb->modifier))
> +		    !adlp_ccs_remap_supported(fb->fd))
>  			size = ALIGN(size, 2 * 1024 * 1024);
>  
>  		return size;
> -- 
> 2.27.0
>