freedreno: UBWC allocator

UBWC requires space for a metadata or flag buffer
that contains compression data. Each 16x4 tile of image
data corresponds to a byte of compression data.

This buffer needs to be stored before (at a lower address)
the image buffer in order to match up with what the
display driver. This allows the display driver to directly
scan-out at UBWC buffer.

3 files changed, 36 insertions, 0 deletions

diff --git a/src/gallium/drivers/freedreno/a6xx/fd6_resource.c b/src/gallium/drivers/freedreno/a6xx/fd6_resource.c
index ff869d7d87b..e15a7ba44bb 100644
--- a/src/gallium/drivers/freedreno/a6xx/fd6_resource.c
+++ b/src/gallium/drivers/freedreno/a6xx/fd6_resource.c
@@ -27,6 +27,8 @@
 
 #include "fd6_resource.h"
 
+#include "a6xx.xml.h"
+
 /* indexed by cpp, including msaa 2x and 4x: */
 static const struct {
 	unsigned pitchalign;
@@ -160,6 +162,38 @@ setup_slices(struct fd_resource *rsc, uint32_t alignment, enum pipe_format forma
 }
 
 uint32_t
+fd6_fill_ubwc_buffer_sizes(struct fd_resource *rsc)
+{
+#define RGB_TILE_WIDTH 16
+#define RBG_TILE_WIDTH_ALIGNMENT 64
+#define RGB_TILE_HEIGHT 4
+#define RGB_TILE_HEIGHT_ALIGNMENT 16
+#define UBWC_PLANE_SIZE_ALIGNMENT 4096
+
+	struct pipe_resource *prsc = &rsc->base;
+	uint32_t width = prsc->width0;
+	uint32_t height = prsc->height0;
+
+	/* limit things to simple single level 2d for now: */
+	if ((prsc->depth0 != 1) || (prsc->array_size != 1) || (prsc->last_level != 0))
+		return 0;
+
+	uint32_t meta_stride =
+		ALIGN_POT(DIV_ROUND_UP(width, RGB_TILE_WIDTH), RBG_TILE_WIDTH_ALIGNMENT);
+	uint32_t meta_scanlines =
+		ALIGN_POT(DIV_ROUND_UP(height, RGB_TILE_HEIGHT), RGB_TILE_HEIGHT_ALIGNMENT);
+	uint32_t meta_plane =
+		ALIGN_POT(meta_stride * meta_scanlines, UBWC_PLANE_SIZE_ALIGNMENT);
+
+	rsc->offset = meta_plane;
+	rsc->ubwc_pitch = meta_stride;
+	rsc->ubwc_size = meta_plane >> 2;
+	rsc->tile_mode = TILE6_3;
+
+	return rsc->ubwc_size;
+}
+
+uint32_t
 fd6_setup_slices(struct fd_resource *rsc)
 {
 	uint32_t alignment;
diff --git a/src/gallium/drivers/freedreno/a6xx/fd6_resource.h b/src/gallium/drivers/freedreno/a6xx/fd6_resource.h
index a19f2744dd7..83b6fb246c7 100644
--- a/src/gallium/drivers/freedreno/a6xx/fd6_resource.h
+++ b/src/gallium/drivers/freedreno/a6xx/fd6_resource.h
@@ -30,6 +30,7 @@
 
 #include "freedreno_resource.h"
 
+uint32_t fd6_fill_ubwc_buffer_sizes(struct fd_resource *rsc);
 uint32_t fd6_setup_slices(struct fd_resource *rsc);
 
 #endif /* FD6_RESOURCE_H_ */
diff --git a/src/gallium/drivers/freedreno/a6xx/fd6_screen.c b/src/gallium/drivers/freedreno/a6xx/fd6_screen.c
index be92d4a877b..d5c78c16dc7 100644
--- a/src/gallium/drivers/freedreno/a6xx/fd6_screen.c
+++ b/src/gallium/drivers/freedreno/a6xx/fd6_screen.c
@@ -136,4 +136,5 @@ fd6_screen_init(struct pipe_screen *pscreen)
 
 	screen->setup_slices = fd6_setup_slices;
 	screen->tile_mode = fd6_tile_mode;
+	screen->fill_ubwc_buffer_sizes = fd6_fill_ubwc_buffer_sizes;
 }