[PATCH i-g-t v3 6/6] tests/intel/xe_pat: verify wb-transient with pipe crc

[Matthew Auld]

On Xe2 using the L3:XD (wb-transient) caching mode, which is intended
for display use, verify we don't observe display corruption when
rendering unto the display surface. Transient cache entries should be
flushed by the time we do the flip, if not we will detect pipe crc
mismatch vs reference fb.

Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
Cc: Nirmoy Das <nirmoy.das at intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>
---
 tests/intel/xe_pat.c | 121 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)

diff --git a/tests/intel/xe_pat.c b/tests/intel/xe_pat.c
index 6918ebe7e..d20100d7e 100644
--- a/tests/intel/xe_pat.c
+++ b/tests/intel/xe_pat.c
@@ -10,6 +10,8 @@
  * Functionality: pat_index
  */
 
+#include <fcntl.h>
+
 #include "igt.h"
 #include "igt_vgem.h"
 #include "intel_blt.h"
@@ -722,6 +724,122 @@ static void prime_external_import_coh(void)
 	drm_close_driver(fd2);
 }
 
+/**
+ * SUBTEST: display-vs-wb-transient
+ * Test category: functionality test
+ * Description: Scanout with dirty L3:XD
+ */
+static void display_vs_wb_transient(int fd)
+{
+	uint16_t pat_index_modes[] = {
+		3, /* UC (baseline) */
+		6, /* L3:XD (uncompressed) */
+	};
+	uint32_t devid = intel_get_drm_devid(fd);
+	igt_render_copyfunc_t render_copy = NULL;
+	igt_crc_t ref_crc = {}, crc = {};
+	igt_plane_t *primary;
+	igt_display_t display;
+	igt_output_t *output;
+	igt_pipe_crc_t *pipe_crc;
+	drmModeModeInfoPtr mode;
+	struct intel_bb *ibb;
+	struct buf_ops *bops;
+	struct igt_fb src_fb, dst_fb;
+	struct intel_buf src, dst;
+	enum pipe pipe;
+	int bpp = 32;
+	int i;
+
+	igt_require(intel_get_device_info(devid)->graphics_ver >= 20);
+
+	render_copy = igt_get_render_copyfunc(devid);
+	igt_require(render_copy);
+	igt_require(xe_has_engine_class(fd, DRM_XE_ENGINE_CLASS_RENDER));
+
+	igt_display_require(&display, fd);
+	igt_display_require_output(&display);
+	kmstest_set_vt_graphics_mode();
+
+	bops = buf_ops_create(fd);
+	ibb = intel_bb_create(fd, SZ_4K);
+
+	for_each_pipe_with_valid_output(&display, pipe, output) {
+		igt_display_reset(&display);
+
+		igt_output_set_pipe(output, pipe);
+		if (!intel_pipe_output_combo_valid(&display))
+			continue;
+
+		mode = igt_output_get_mode(output);
+		pipe_crc = igt_pipe_crc_new(fd, pipe, IGT_PIPE_CRC_SOURCE_AUTO);
+		break;
+	}
+
+	primary = igt_output_get_plane_type(output, DRM_PLANE_TYPE_PRIMARY);
+
+	igt_create_fb(fd, mode->hdisplay, mode->vdisplay,
+		      DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_LINEAR, &src_fb);
+	igt_draw_fill_fb(fd, &src_fb, 0xFF);
+
+	igt_plane_set_fb(primary, &src_fb);
+	igt_assert_eq(igt_display_commit2(&display, COMMIT_ATOMIC), 0);
+	igt_pipe_crc_collect_crc(pipe_crc, &ref_crc);
+
+	intel_buf_init_full(bops, src_fb.gem_handle, &src, src_fb.width,
+			    src_fb.height, bpp, 0, I915_TILING_NONE,
+			    I915_COMPRESSION_NONE, src_fb.size,
+			    src_fb.strides[0], 0, DEFAULT_PAT_INDEX,
+			    DEFAULT_MOCS_INDEX);
+
+	for (i = 0; i < ARRAY_SIZE(pat_index_modes); i++) {
+		int fw_handle;
+
+		igt_create_fb(fd, mode->hdisplay, mode->vdisplay,
+			      DRM_FORMAT_XRGB8888, DRM_FORMAT_MOD_LINEAR, &dst_fb);
+
+		intel_buf_init_full(bops, dst_fb.gem_handle, &dst,
+				    dst_fb.width, dst_fb.height, bpp, 0,
+				    I915_TILING_NONE, I915_COMPRESSION_NONE,
+				    dst_fb.size, dst_fb.strides[0], 0,
+				    pat_index_modes[i],
+				    intel_get_defer_to_pat_mocs_index(fd));
+
+		/* c0 -> c6 might flush caches */
+		fw_handle = igt_debugfs_open(fd, "forcewake_all", O_RDONLY);
+		igt_assert(fw_handle >= 0);
+
+		render_copy(ibb,
+			    &src,
+			    0, 0, dst_fb.width, dst_fb.height,
+			    &dst,
+			    0, 0);
+		intel_bb_sync(ibb);
+
+		/*
+		 * Display engine is not coherent with GPU/CPU caches, however
+		 * with new L3:XD caching mode, the GPU cache entries marked as
+		 * transient should be automatically flushed by the time we do
+		 * the flip.
+		 */
+
+		igt_plane_set_fb(primary, &dst_fb);
+		igt_assert_eq(igt_display_commit2(&display, COMMIT_ATOMIC), 0);
+		igt_pipe_crc_collect_crc(pipe_crc, &crc);
+
+		igt_assert_crc_equal(&crc, &ref_crc);
+
+		intel_bb_reset(ibb, false);
+
+		intel_buf_close(dst.bops, &dst);
+		igt_remove_fb(fd, &dst_fb);
+		close(fw_handle);
+	}
+
+	igt_remove_fb(fd, &src_fb);
+	intel_bb_destroy(ibb);
+}
+
 static uint8_t get_pat_idx_uc(int fd, bool *compressed)
 {
 	if (compressed)
@@ -1054,6 +1172,9 @@ igt_main_args("V", NULL, help_str, opt_handler, NULL)
 						     ARRAY_SIZE(xe2_pat_index_modes));
 	}
 
+	igt_subtest("display-vs-wb-transient")
+		display_vs_wb_transient(fd);
+
 	igt_fixture
 		drm_close_driver(fd);
 }
-- 
2.43.2