freedreno/a6xx: Add a testcase for UBWC buffer sharing.

These offsets are hand-computed referencing msm_media_info.h, and match
our driver's current behavior.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4931>

diff --git a/src/freedreno/fdl/fd6_layout_test.c b/src/freedreno/fdl/fd6_layout_test.c
index a30b089..45a9739 100644 (file)
--- a/src/freedreno/fdl/fd6_layout_test.c
+++ b/src/freedreno/fdl/fd6_layout_test.c
@@ -373,6 +373,23 @@ static const struct testcase testcases[] = {
                },
        },
 
+       /* Single-level RGBA8888 UBWC following UBWC alignment rules laid out in
+        * msm_media_info.h to verify that we don't break buffer sharing.
+        */
+       {
+               .format = PIPE_FORMAT_R8G8B8A8_UNORM,
+               .layout = {
+                       .tile_mode = TILE6_3,
+                       .ubwc = true,
+                       .width0 = 16384, .height0 = 129,
+                       .slices = {
+                               { .offset = 1024 * 48, .pitch = 16384 * 4 },
+                       },
+                       .ubwc_slices = {
+                               { .offset = 0, .pitch = 1024 },
+                       },
+               },
+       },
 };
 
 static bool test_layout(const struct testcase *testcase)
@@ -385,7 +402,7 @@ static bool test_layout(const struct testcase *testcase)
 
        int max_size = MAX2(testcase->layout.width0, testcase->layout.height0);
        int mip_levels = 1;
-       while (max_size > 1) {
+       while (max_size > 1 && testcase->layout.slices[mip_levels].pitch) {
                mip_levels++;
                max_size = u_minify(max_size, 1);
        }
@@ -401,10 +418,11 @@ static bool test_layout(const struct testcase *testcase)
                        testcase->is_3d);
 
        /* fdl lays out UBWC data before the color data, while all we have
-        * recorded in this testcase are the color offsets.  Shift the fdl layout
-        * down so we can compare color offsets.
+        * recorded in this testcase are the color offsets (other than the UBWC
+        * buffer sharing test).  Shift the fdl layout down so we can compare
+        * color offsets.
         */
-       if (layout.ubwc) {
+       if (layout.ubwc && !testcase->layout.slices[0].offset) {
                for (int l = 1; l < mip_levels; l++)
                        layout.slices[l].offset -= layout.slices[0].offset;
                layout.slices[0].offset = 0;