On 17-08-03 17:52:41, Jason Ekstrand wrote:
Previously, the test used the old 64x64 convention that Ville introduced
for CCS tiles and not the current 128x32 Y-tile convention. Also, the
original scheme for generating the CCS data was over-complicated and
didn't work correctly because it assumed you could cut the main surface
at an arbitrary Y coordinate. While you clearly *can* do this (the
hardware does), it's not a good idea for a generator in a test. The new
scheme, introduced here, is entirely based on the relationship between
cache-lines in the main surface and the CCS that's documented in the
PRM. By keeping everything CCS cache-line aligned, our chances of
generating correct data for an arbitrary-size surface are much higher.
Signed-off-by: Jason Ekstrand <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: Daniel Stone <[email protected]>
Cc: Daniel Vetter <[email protected]>
Reviewed-by: Ben Widawsky <[email protected]>
---
tests/kms_ccs.c | 91 ++++++++++++++++++++++++++++++++++++++++-----------------
1 file changed, 65 insertions(+), 26 deletions(-)
diff --git a/tests/kms_ccs.c b/tests/kms_ccs.c
index 29d676a..ef952f2 100644
--- a/tests/kms_ccs.c
+++ b/tests/kms_ccs.c
@@ -48,12 +48,17 @@ typedef struct {
#define COMPRESSED_GREEN 0x000ff00f
#define COMPRESSED_BLUE 0x00000fff
+#define CCS_UNCOMPRESSED 0x0
+#define CCS_COMPRESSED 0x55
+
#define RED 0x00ff0000
-static void render_fb(data_t *data, bool compressed)
+static void render_fb(data_t *data, bool compressed,
+ int height, unsigned int stride)
{
struct igt_fb *fb = &data->fb;
uint32_t *ptr;
+ unsigned int half_height, half_size;
int i;
igt_assert(fb->fb_id);
@@ -62,43 +67,63 @@ static void render_fb(data_t *data, bool compressed)
0, fb->size,
PROT_READ | PROT_WRITE);
- for (i = 0; i < fb->size / 4; i++) {
- /* Fill upper half as compressed */
- if (compressed && i < fb->size / 4 / 2)
- ptr[i] = COMPRESSED_RED;
- else
+ if (compressed) {
+ /* In the compressed case, we want the top half of the
+ * surface to be uncompressed and the bottom half to be
+ * compressed.
+ *
+ * We need to cut the surface on a CCS cache-line boundary,
+ * otherwise, we're going to be in trouble when we try to
+ * generate CCS data for the surface. A cache line in the
+ * CCS is 16x16 cache-line-pairs in the main surface. 16
+ * cache lines is 64 rows high.
+ */
+ half_height = ALIGN(height, 128) / 2;
+ half_size = half_height * stride;
+ for (i = 0; i < fb->size / 4; i++) {
+ if (i < half_size / 4)
+ ptr[i] = RED;
+ else
+ ptr[i] = COMPRESSED_RED;
+ }
+ } else {
+ for (i = 0; i < fb->size / 4; i++)
ptr[i] = RED;
}
munmap(ptr, fb->size);
}
-static uint8_t *ccs_ptr(uint8_t *ptr,
- unsigned int x, unsigned int y,
- unsigned int stride)
+static unsigned int
+y_tile_y_pos(unsigned int offset, unsigned int stride)
{
- return ptr +
- ((y & ~0x3f) * stride) +
- ((x & ~0x7) * 64) +
- ((y & 0x3f) * 8) +
- (x & 7);
+ unsigned int y_tiles, y;
+ y_tiles = (offset / 4096) / (stride / 128);
+ y = y_tiles * 32 + ((offset & 0x1f0) >> 4);
+ return y;
}
static void render_ccs(data_t *data, uint32_t gem_handle,
uint32_t offset, uint32_t size,
- int w, int h, unsigned int stride)
+ int height, unsigned int ccs_stride)
{
+ unsigned int half_height, ccs_half_height;
uint8_t *ptr;
- int x, y;
+ int i;
+
+ half_height = ALIGN(height, 128) / 2;
+ ccs_half_height = half_height / 16;
ptr = gem_mmap__cpu(data->drm_fd, gem_handle,
offset, size,
PROT_READ | PROT_WRITE);
- /* Mark upper half as compressed */
- for (x = 0 ; x < w; x++)
- for (y = 0 ; y <= h / 2; y++)
- *ccs_ptr(ptr, x, y, stride) = 0x55;
+ for (i = 0; i < size; i++) {
+ if (y_tile_y_pos(i, ccs_stride) < ccs_half_height)
+ ptr[i] = CCS_UNCOMPRESSED;
+ else
+ ptr[i] = CCS_COMPRESSED;
+ }
munmap(ptr, size);
}
@@ -143,12 +168,26 @@ static void display_fb(data_t *data, int compressed)
size[0] = f.pitches[0] * ALIGN(height, 32);
if (compressed) {
- width = ALIGN(f.width, 16) / 16;
- height = ALIGN(f.height, 8) / 8;
- f.pitches[1] = ALIGN(width * 1, 64);
+ /* From the Sky Lake PRM, Vol 12, "Color Control Surface":
+ *
+ * "The compression state of the cache-line pair is
+ * specified by 2 bits in the CCS. Each CCS cache-line
+ * represents an area on the main surface of 16x16 sets
+ * of 128 byte Y-tiled cache-line-pairs. CCS is always Y
+ * tiled."
+ *
+ * A "cache-line-pair" for a Y-tiled surface is two
+ * horizontally adjacent cache lines. When operating in
+ * bytes and rows, this gives us a scale-down factor of
+ * 32x16. Since the main surface has a 32-bit format, we
+ * need to multiply width by 4 to get bytes.
+ */
+ width = ALIGN(f.width * 4, 32) / 32;
+ height = ALIGN(f.height, 16) / 16;
+ f.pitches[1] = ALIGN(width * 1, 128);
f.modifier[1] = modifier;
f.offsets[1] = size[0];
- size[1] = f.pitches[1] * ALIGN(height, 64);
+ size[1] = f.pitches[1] * ALIGN(height, 32);
f.handles[0] = gem_create(data->drm_fd, size[0] + size[1]);
f.handles[1] = f.handles[0];
@@ -176,11 +215,11 @@ static void display_fb(data_t *data, int compressed)
fb->cairo_surface = NULL;
fb->domain = 0;
- render_fb(data, compressed);
+ render_fb(data, compressed, f.height, f.pitches[0]);
if (compressed)
render_ccs(data, f.handles[0], f.offsets[1], size[1],
- f.width/16, f.height/8, f.pitches[1]);
+ f.height, f.pitches[1]);
primary = igt_output_get_plane_type(data->output,
DRM_PLANE_TYPE_PRIMARY);
igt_plane_set_fb(primary, fb);
--
2.5.0.400.gff86faf
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