[Mesa-dev] [PATCH v2 2/7] ac: compute the DCC fast clear size per slice on GFX8

[Samuel Pitoiset]

v2: - add dcc_slice_fast_clear_size to be more confortable about RadeonSI

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---
 src/amd/common/ac_surface.c | 27 +++++++++++++++++++++++++++
 src/amd/common/ac_surface.h |  1 +
 2 files changed, 28 insertions(+)

diff --git a/src/amd/common/ac_surface.c b/src/amd/common/ac_surface.c
index 9e45bd44b72..55237eb1eef 100644
--- a/src/amd/common/ac_surface.c
+++ b/src/amd/common/ac_surface.c
@@ -308,6 +308,33 @@ static int gfx6_compute_level(ADDR_HANDLE addrlib,
 			 * slice is the same size) it's easy to compute.
 			 */
 			surf->dcc_slice_size = AddrDccOut->dccRamSize / config->info.array_size;
+
+			/* For arrays, we have to compute the DCC info again
+			 * with one slice size to get a correct fast clear
+			 * size.
+			 */
+			if (config->info.array_size > 1) {
+				AddrDccIn->colorSurfSize = AddrSurfInfoOut->sliceSize;
+				AddrDccIn->tileMode = AddrSurfInfoOut->tileMode;
+				AddrDccIn->tileInfo = *AddrSurfInfoOut->pTileInfo;
+				AddrDccIn->tileIndex = AddrSurfInfoOut->tileIndex;
+				AddrDccIn->macroModeIndex = AddrSurfInfoOut->macroModeIndex;
+
+				ret = AddrComputeDccInfo(addrlib,
+							 AddrDccIn, AddrDccOut);
+				if (ret == ADDR_OK) {
+					/* If the DCC memory isn't properly
+					 * aligned, the data are interleaved
+					 * accross slices.
+					 */
+					if (AddrDccOut->dccRamSizeAligned)
+						surf_level->dcc_slice_fast_clear_size = AddrDccOut->dccFastClearSize;
+					else
+						surf_level->dcc_slice_fast_clear_size = 0;
+				}
+			} else {
+				surf_level->dcc_slice_fast_clear_size = surf_level->dcc_fast_clear_size;
+			}
 		}
 	}
 
diff --git a/src/amd/common/ac_surface.h b/src/amd/common/ac_surface.h
index 8143c9f9a0e..a4144a4e16c 100644
--- a/src/amd/common/ac_surface.h
+++ b/src/amd/common/ac_surface.h
@@ -76,6 +76,7 @@ struct legacy_surf_level {
     uint32_t                    slice_size_dw; /* in dwords; max = 4GB / 4. */
     uint32_t                    dcc_offset; /* relative offset within DCC mip tree */
     uint32_t                    dcc_fast_clear_size;
+    uint32_t                    dcc_slice_fast_clear_size;
     unsigned                    nblk_x:15;
     unsigned                    nblk_y:15;
     enum radeon_surf_mode       mode:2;
-- 
2.22.0