}
bool
-isl_surf_get_ccs_surf(const struct isl_device *dev,
- const struct isl_surf *surf,
- struct isl_surf *aux_surf,
- struct isl_surf *extra_aux_surf,
- uint32_t row_pitch_B)
+isl_surf_supports_ccs(const struct isl_device *dev,
+ const struct isl_surf *surf)
{
- assert(aux_surf);
-
- /* An uninitialized surface is needed to get a CCS surface. */
- if (aux_surf->size_B > 0 &&
- (extra_aux_surf == NULL || extra_aux_surf->size_B > 0)) {
- return false;
- }
-
- /* A surface can't have two CCS surfaces. */
- if (aux_surf->usage & ISL_SURF_USAGE_CCS_BIT)
- return false;
-
- if (ISL_DEV_GEN(dev) < 12 && surf->samples > 1)
- return false;
-
/* CCS support does not exist prior to Gen7 */
if (ISL_DEV_GEN(dev) <= 6)
return false;
if (surf->usage & ISL_SURF_USAGE_DISABLE_AUX_BIT)
return false;
- /* Allow CCS for single-sampled stencil buffers Gen12+. */
- if (isl_surf_usage_is_stencil(surf->usage) &&
- (ISL_DEV_GEN(dev) < 12 || surf->samples > 1))
- return false;
-
- /* [TGL+] CCS can only be added to a non-D16-formatted depth buffer if it
- * has HiZ. If not for GEN:BUG:1406512483 "deprecate compression enable
- * states", D16 would be supported. Supporting D16 requires being able to
- * specify that the control surface is present and simultaneously disabling
- * compression. The above bug makes it so that it's not possible to specify
- * this configuration.
- */
- if (isl_surf_usage_is_depth(surf->usage) && (aux_surf->size_B == 0 ||
- ISL_DEV_GEN(dev) < 12 || surf->format == ISL_FORMAT_R16_UNORM)) {
- return false;
- }
-
- /* The PRM doesn't say this explicitly, but fast-clears don't appear to
- * work for 3D textures until gen9 where the layout of 3D textures changes
- * to match 2D array textures.
- */
- if (ISL_DEV_GEN(dev) <= 8 && surf->dim != ISL_SURF_DIM_2D)
- return false;
-
- /* From the HSW PRM Volume 7: 3D-Media-GPGPU, page 652 (Color Clear of
- * Non-MultiSampler Render Target Restrictions):
- *
- * "Support is for non-mip-mapped and non-array surface types only."
- *
- * This restriction is lifted on gen8+. Technically, it may be possible to
- * create a CCS for an arrayed or mipmapped image and only enable CCS_D
- * when rendering to the base slice. However, there is no documentation
- * tell us what the hardware would do in that case or what it does if you
- * walk off the bases slice. (Does it ignore CCS or does it start
- * scribbling over random memory?) We play it safe and just follow the
- * docs and don't allow CCS_D for arrayed or mip-mapped surfaces.
- */
- if (ISL_DEV_GEN(dev) <= 7 &&
- (surf->levels > 1 || surf->logical_level0_px.array_len > 1))
- return false;
-
- /* On Gen12, 8BPP surfaces cannot be compressed if any level is not
- * 32Bx4row-aligned. For now, just reject the cases where alignment
- * matters.
- */
- if (ISL_DEV_GEN(dev) >= 12 &&
- isl_format_get_layout(surf->format)->bpb == 8 && surf->levels >= 3) {
- isl_finishme("%s:%s: CCS for 8BPP textures with 3+ miplevels is "
- "disabled, but support for more levels is possible.",
- __FILE__, __func__);
- return false;
- }
-
- /* On Gen12, all CCS-compressed surface pitches must be multiples of 512B.
- */
- if (ISL_DEV_GEN(dev) >= 12 && surf->row_pitch_B % 512 != 0)
- return false;
-
if (isl_format_is_compressed(surf->format))
return false;
- /* According to GEN:BUG:1406738321, 3D textures need a blit to a new
- * surface in order to perform a resolve. For now, just disable CCS.
- */
- if (ISL_DEV_GEN(dev) >= 12 && surf->dim == ISL_SURF_DIM_3D) {
- isl_finishme("%s:%s: CCS for 3D textures is disabled, but a workaround"
- " is available.", __FILE__, __func__);
+ if (!isl_is_pow2(isl_format_get_layout(surf->format)->bpb))
return false;
- }
-
- /* GEN:BUG:1207137018
- *
- * TODO: implement following workaround currently covered by the restriction
- * above. If following conditions are met:
- *
- * - RENDER_SURFACE_STATE.Surface Type == 3D
- * - RENDER_SURFACE_STATE.Auxiliary Surface Mode != AUX_NONE
- * - RENDER_SURFACE_STATE.Tiled ResourceMode is TYF or TYS
- *
- * Set the value of RENDER_SURFACE_STATE.Mip Tail Start LOD to a mip that
- * larger than those present in the surface (i.e. 15)
- */
-
- /* TODO: More conditions where it can fail. */
/* From the Ivy Bridge PRM, Vol2 Part1 11.7 "MCS Buffer for Render
* Target(s)", beneath the "Fast Color Clear" bullet (p326):
*
* - Support is limited to tiled render targets.
- * - MCS buffer for non-MSRT is supported only for RT formats 32bpp,
- * 64bpp, and 128bpp.
*
* From the Skylake documentation, it is made clear that X-tiling is no
* longer supported:
*
* - MCS and Lossless compression is supported for
- * TiledY/TileYs/TileYf non-MSRTs only.
+ * TiledY/TileYs/TileYf non-MSRTs only.
+ *
+ * From the BSpec (44930) for Gen12:
+ *
+ * Linear CCS is only allowed for Untyped Buffers but only via HDC
+ * Data-Port messages.
+ *
+ * We never use untyped messages on surfaces created by ISL on Gen9+ so
+ * this means linear is out on Gen12+ as well.
*/
- enum isl_format ccs_format;
+ if (surf->tiling == ISL_TILING_LINEAR)
+ return false;
+
if (ISL_DEV_GEN(dev) >= 12) {
- /* TODO: Handle the other tiling formats */
- if (surf->tiling != ISL_TILING_Y0)
+ if (isl_surf_usage_is_stencil(surf->usage) && surf->samples > 1)
return false;
- /* BSpec 44930:
+ /* [TGL+] CCS can only be added to a non-D16-formatted depth buffer if
+ * it has HiZ. If not for GEN:BUG:1406512483 "deprecate compression
+ * enable states", D16 would be supported. Supporting D16 requires being
+ * able to specify that the control surface is present and
+ * simultaneously disabling compression. The above bug makes it so that
+ * it's not possible to specify this configuration.
*
- * Linear CCS is only allowed for Untyped Buffers but only via HDC
- * Data-Port messages.
+ * Note: ISL Doesn't currently support depth CCS without HiZ at all.
*/
- assert(surf->tiling != ISL_TILING_LINEAR);
-
- switch (isl_format_get_layout(surf->format)->bpb) {
- case 8: ccs_format = ISL_FORMAT_GEN12_CCS_8BPP_Y0; break;
- case 16: ccs_format = ISL_FORMAT_GEN12_CCS_16BPP_Y0; break;
- case 32: ccs_format = ISL_FORMAT_GEN12_CCS_32BPP_Y0; break;
- case 64: ccs_format = ISL_FORMAT_GEN12_CCS_64BPP_Y0; break;
- case 128: ccs_format = ISL_FORMAT_GEN12_CCS_128BPP_Y0; break;
- default:
+ if (isl_surf_usage_is_depth(surf->usage) &&
+ surf->format == ISL_FORMAT_R16_UNORM) {
return false;
}
- } else if (ISL_DEV_GEN(dev) >= 9) {
- if (!isl_tiling_is_any_y(surf->tiling))
- return false;
- switch (isl_format_get_layout(surf->format)->bpb) {
- case 32: ccs_format = ISL_FORMAT_GEN9_CCS_32BPP; break;
- case 64: ccs_format = ISL_FORMAT_GEN9_CCS_64BPP; break;
- case 128: ccs_format = ISL_FORMAT_GEN9_CCS_128BPP; break;
- default:
+ /* On Gen12, 8BPP surfaces cannot be compressed if any level is not
+ * 32Bx4row-aligned. For now, just reject the cases where alignment
+ * matters.
+ */
+ if (isl_format_get_layout(surf->format)->bpb == 8 && surf->levels >= 3) {
+ isl_finishme("%s:%s: CCS for 8BPP textures with 3+ miplevels is "
+ "disabled, but support for more levels is possible.",
+ __FILE__, __func__);
return false;
}
- } else if (surf->tiling == ISL_TILING_Y0) {
- switch (isl_format_get_layout(surf->format)->bpb) {
- case 32: ccs_format = ISL_FORMAT_GEN7_CCS_32BPP_Y; break;
- case 64: ccs_format = ISL_FORMAT_GEN7_CCS_64BPP_Y; break;
- case 128: ccs_format = ISL_FORMAT_GEN7_CCS_128BPP_Y; break;
- default:
+
+ /* On Gen12, all CCS-compressed surface pitches must be multiples of
+ * 512B.
+ */
+ if (surf->row_pitch_B % 512 != 0)
return false;
- }
- } else if (surf->tiling == ISL_TILING_X) {
- switch (isl_format_get_layout(surf->format)->bpb) {
- case 32: ccs_format = ISL_FORMAT_GEN7_CCS_32BPP_X; break;
- case 64: ccs_format = ISL_FORMAT_GEN7_CCS_64BPP_X; break;
- case 128: ccs_format = ISL_FORMAT_GEN7_CCS_128BPP_X; break;
- default:
+
+ /* According to GEN:BUG:1406738321, 3D textures need a blit to a new
+ * surface in order to perform a resolve. For now, just disable CCS.
+ */
+ if (surf->dim == ISL_SURF_DIM_3D) {
+ isl_finishme("%s:%s: CCS for 3D textures is disabled, but a workaround"
+ " is available.", __FILE__, __func__);
return false;
}
+
+ /* GEN:BUG:1207137018
+ *
+ * TODO: implement following workaround currently covered by the
+ * restriction above. If following conditions are met:
+ *
+ * - RENDER_SURFACE_STATE.Surface Type == 3D
+ * - RENDER_SURFACE_STATE.Auxiliary Surface Mode != AUX_NONE
+ * - RENDER_SURFACE_STATE.Tiled ResourceMode is TYF or TYS
+ *
+ * Set the value of RENDER_SURFACE_STATE.Mip Tail Start LOD to a mip
+ * that larger than those present in the surface (i.e. 15)
+ */
+
+ /* TODO: Handle the other tiling formats */
+ if (surf->tiling != ISL_TILING_Y0)
+ return false;
} else {
+ /* ISL_DEV_GEN(dev) < 12 */
+ if (surf->samples > 1)
+ return false;
+
+ /* CCS is only for color images on Gen7-11 */
+ if (isl_surf_usage_is_depth_or_stencil(surf->usage))
+ return false;
+
+ /* The PRM doesn't say this explicitly, but fast-clears don't appear to
+ * work for 3D textures until gen9 where the layout of 3D textures
+ * changes to match 2D array textures.
+ */
+ if (ISL_DEV_GEN(dev) <= 8 && surf->dim != ISL_SURF_DIM_2D)
+ return false;
+
+ /* From the HSW PRM Volume 7: 3D-Media-GPGPU, page 652 (Color Clear of
+ * Non-MultiSampler Render Target Restrictions):
+ *
+ * "Support is for non-mip-mapped and non-array surface types only."
+ *
+ * This restriction is lifted on gen8+. Technically, it may be possible
+ * to create a CCS for an arrayed or mipmapped image and only enable
+ * CCS_D when rendering to the base slice. However, there is no
+ * documentation tell us what the hardware would do in that case or what
+ * it does if you walk off the bases slice. (Does it ignore CCS or does
+ * it start scribbling over random memory?) We play it safe and just
+ * follow the docs and don't allow CCS_D for arrayed or mip-mapped
+ * surfaces.
+ */
+ if (ISL_DEV_GEN(dev) <= 7 &&
+ (surf->levels > 1 || surf->logical_level0_px.array_len > 1))
+ return false;
+
+ /* From the Ivy Bridge PRM, Vol2 Part1 11.7 "MCS Buffer for Render
+ * Target(s)", beneath the "Fast Color Clear" bullet (p326):
+ *
+ * - MCS buffer for non-MSRT is supported only for RT formats 32bpp,
+ * 64bpp, and 128bpp.
+ */
+ if (isl_format_get_layout(surf->format)->bpb < 32)
+ return false;
+
+ /* From the Skylake documentation, it is made clear that X-tiling is no
+ * longer supported:
+ *
+ * - MCS and Lossless compression is supported for
+ * TiledY/TileYs/TileYf non-MSRTs only.
+ */
+ if (ISL_DEV_GEN(dev) >= 9 && !isl_tiling_is_any_y(surf->tiling))
+ return false;
+ }
+
+ return true;
+}
+
+bool
+isl_surf_get_ccs_surf(const struct isl_device *dev,
+ const struct isl_surf *surf,
+ struct isl_surf *aux_surf,
+ struct isl_surf *extra_aux_surf,
+ uint32_t row_pitch_B)
+{
+ assert(aux_surf);
+
+ /* An uninitialized surface is needed to get a CCS surface. */
+ if (aux_surf->size_B > 0 &&
+ (extra_aux_surf == NULL || extra_aux_surf->size_B > 0)) {
return false;
}
+ /* A surface can't have two CCS surfaces. */
+ if (aux_surf->usage & ISL_SURF_USAGE_CCS_BIT)
+ return false;
+
+ if (!isl_surf_supports_ccs(dev, surf))
+ return false;
+
if (ISL_DEV_GEN(dev) >= 12) {
+ enum isl_format ccs_format;
+ switch (isl_format_get_layout(surf->format)->bpb) {
+ case 8: ccs_format = ISL_FORMAT_GEN12_CCS_8BPP_Y0; break;
+ case 16: ccs_format = ISL_FORMAT_GEN12_CCS_16BPP_Y0; break;
+ case 32: ccs_format = ISL_FORMAT_GEN12_CCS_32BPP_Y0; break;
+ case 64: ccs_format = ISL_FORMAT_GEN12_CCS_64BPP_Y0; break;
+ case 128: ccs_format = ISL_FORMAT_GEN12_CCS_128BPP_Y0; break;
+ default:
+ return false;
+ }
+
/* On Gen12, the CCS is a scaled-down version of the main surface. We
* model this as the CCS compressing a 2D-view of the entire surface.
*/
assert(!ok || ccs_surf->size_B == surf->size_B / 256);
return ok;
} else {
+ enum isl_format ccs_format;
+ if (ISL_DEV_GEN(dev) >= 9) {
+ switch (isl_format_get_layout(surf->format)->bpb) {
+ case 32: ccs_format = ISL_FORMAT_GEN9_CCS_32BPP; break;
+ case 64: ccs_format = ISL_FORMAT_GEN9_CCS_64BPP; break;
+ case 128: ccs_format = ISL_FORMAT_GEN9_CCS_128BPP; break;
+ default: unreachable("Unsupported CCS format");
+ return false;
+ }
+ } else if (surf->tiling == ISL_TILING_Y0) {
+ switch (isl_format_get_layout(surf->format)->bpb) {
+ case 32: ccs_format = ISL_FORMAT_GEN7_CCS_32BPP_Y; break;
+ case 64: ccs_format = ISL_FORMAT_GEN7_CCS_64BPP_Y; break;
+ case 128: ccs_format = ISL_FORMAT_GEN7_CCS_128BPP_Y; break;
+ default: unreachable("Unsupported CCS format");
+ }
+ } else if (surf->tiling == ISL_TILING_X) {
+ switch (isl_format_get_layout(surf->format)->bpb) {
+ case 32: ccs_format = ISL_FORMAT_GEN7_CCS_32BPP_X; break;
+ case 64: ccs_format = ISL_FORMAT_GEN7_CCS_64BPP_X; break;
+ case 128: ccs_format = ISL_FORMAT_GEN7_CCS_128BPP_X; break;
+ default: unreachable("Unsupported CCS format");
+ }
+ } else {
+ unreachable("Invalid tiling format");
+ }
+
return isl_surf_init(dev, aux_surf,
.dim = surf->dim,
.format = ccs_format,
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