[igt-dev] [PATCH v2 4/7] lib/igt_fb: Add 64bpp support to the XY_SRC blit command

[Imre Deak]

While the XY_SRC blit command lacks native 64bpp copy support, we can
emulate it using a 32bpp copy by treating the 64bpp plane as a 2x wide
32bpp plane. Add support for this, as we need the XY_SRC command at
least for GEN12+ X-tiled formats.

Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 lib/igt_fb.c            | 30 ++++++++++++++++++++++++------
 lib/intel_batchbuffer.c |  5 +++++
 2 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/lib/igt_fb.c b/lib/igt_fb.c
index 2aa2bffb..f8ed8622 100644
--- a/lib/igt_fb.c
+++ b/lib/igt_fb.c
@@ -1960,9 +1960,31 @@ struct fb_blit_upload {
 	struct intel_batchbuffer *batch;
 };
 
+static bool fast_blit_ok(const struct igt_fb *fb)
+{
+	int gen = intel_gen(intel_get_drm_devid(fb->fd));
+
+	if (gen < 9)
+		return false;
+
+	if (gen < 12)
+		return true;
+
+	return fb->modifier != I915_FORMAT_MOD_X_TILED;
+}
+
 static bool blitter_ok(const struct igt_fb *fb)
 {
 	for (int i = 0; i < fb->num_planes; i++) {
+		int width = fb->plane_width[i];
+
+		/*
+		 * XY_SRC blit supports only 32bpp, but we can still use it
+		 * for a 64bpp plane by treating that as a 2x wide 32bpp plane.
+		 */
+		if (!fast_blit_ok(fb) && fb->plane_bpp[i] == 64)
+			width *= 2;
+
 		/*
 		 * gen4+ stride limit is 4x this with tiling,
 		 * but since our blits are always between tiled
@@ -1970,7 +1992,7 @@ static bool blitter_ok(const struct igt_fb *fb)
 		 * for the tiled surface) we must use the lower
 		 * linear stride limit here.
 		 */
-		if (fb->plane_width[i] > 32767 ||
+		if (width > 32767 ||
 		    fb->plane_height[i] > 32767 ||
 		    fb->strides[i] > 32767)
 			return false;
@@ -2158,8 +2180,6 @@ static void blitcopy(const struct igt_fb *dst_fb,
 	dst_tiling = igt_fb_mod_to_tiling(dst_fb->modifier);
 
 	for (int i = 0; i < dst_fb->num_planes; i++) {
-		int gen = intel_gen(intel_get_drm_devid(src_fb->fd));
-
 		igt_assert_eq(dst_fb->plane_bpp[i], src_fb->plane_bpp[i]);
 		igt_assert_eq(dst_fb->plane_width[i], src_fb->plane_width[i]);
 		igt_assert_eq(dst_fb->plane_height[i], src_fb->plane_height[i]);
@@ -2168,9 +2188,7 @@ static void blitcopy(const struct igt_fb *dst_fb,
 		 * blit command, so use the XY_SRC blit command for it
 		 * instead.
 		 */
-		if ((gen >= 9 && gen < 12) ||
-		    (gen >= 12 && (src_tiling != I915_TILING_X &&
-				   dst_tiling != I915_TILING_X))) {
+		if (fast_blit_ok(src_fb) && fast_blit_ok(dst_fb)) {
 			igt_blitter_fast_copy__raw(dst_fb->fd,
 						   src_fb->gem_handle,
 						   src_fb->offsets[i],
diff --git a/lib/intel_batchbuffer.c b/lib/intel_batchbuffer.c
index d6c3657c..5a00481c 100644
--- a/lib/intel_batchbuffer.c
+++ b/lib/intel_batchbuffer.c
@@ -818,6 +818,11 @@ void igt_blitter_src_copy(int fd,
 	src_pitch = (gen >= 4 && src_tiling) ? src_stride / 4 : src_stride;
 	dst_pitch = (gen >= 4 && dst_tiling) ? dst_stride / 4 : dst_stride;
 
+	if (bpp == 64) {
+		bpp /= 2;
+		width *= 2;
+	}
+
 	CHECK_RANGE(src_x); CHECK_RANGE(src_y);
 	CHECK_RANGE(dst_x); CHECK_RANGE(dst_y);
 	CHECK_RANGE(width); CHECK_RANGE(height);
-- 
2.23.1