[igt-dev] [PATCH V6 i-g-t 4/6] kms_writeback: Add writeback-check-output

Brian Starkey
2019-06-13T02:17:50Z

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Add a test which makes commits using the writeback connector, and
checks the output buffer hash to make sure it is/isn't written as
appropriate.

Signed-off-by: Brian Starkey <brian.starkey@arm.com>
---
tests/kms_writeback.c | 124 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 124 insertions(+)

diff --git a/tests/kms_writeback.c b/tests/kms_writeback.c
index 66ef48a6..0f20dadd 100644
--- a/tests/kms_writeback.c
+++ b/tests/kms_writeback.c
@@ -30,6 +30,7 @@
#include "igt.h"
#include "igt_core.h"
#include "igt_fb.h"
+#include "sw_sync.h"

static drmModePropertyBlobRes *get_writeback_formats_blob(igt_output_t *output)
{
@@ -221,6 +222,116 @@ static void writeback_fb_id(igt_output_t *output, igt_fb_t *valid_fb, igt_fb_t *
igt_assert(ret == 0);
}

+static void fill_fb(igt_fb_t *fb, double color[3])
+{
+ cairo_t *cr = igt_get_cairo_ctx(fb->fd, fb);
+ igt_assert(cr);
+
+ igt_paint_color(cr, 0, 0, fb->width, fb->height,
+ color[0], color[1], color[2]);
+}
+
+static void get_and_wait_out_fence(igt_output_t *output)
+{
+ int ret;
+
+ igt_assert(output->writeback_out_fence_fd >= 0);
+
+ ret = sync_fence_wait(output->writeback_out_fence_fd, 1000);
+ igt_assert(ret == 0);
+ close(output->writeback_out_fence_fd);
+ output->writeback_out_fence_fd = -1;
+}
+
+static void writeback_sequence(igt_output_t *output, igt_plane_t *plane,
+ igt_fb_t *in_fb, igt_fb_t *out_fbs[], int n_commits)
+{
+ int i, color_idx = 0;
+ double in_fb_colors[2][3] = {
+ { 1.0, 0.0, 0.0 },
+ { 0.0, 1.0, 0.0 },
+ };
+ double clear_color[3] = { 1.0, 1.0, 1.0 };
+ igt_crc_t cleared_crc, out_expected;
+
+ for (i = 0; i < n_commits; i++, color_idx++) {
+ /* Change the input color each time */
+ fill_fb(in_fb, in_fb_colors[color_idx % 2]);
+
+ if (out_fbs[i]) {
+ igt_crc_t out_before;
+
+ /* Get the expected CRC */
+ fill_fb(out_fbs[i], in_fb_colors[color_idx % 2]);
+ igt_fb_get_crc(out_fbs[i], &out_expected);
+
+ fill_fb(out_fbs[i], clear_color);
+ if (i == 0)
+ igt_fb_get_crc(out_fbs[i], &cleared_crc);
+ igt_fb_get_crc(out_fbs[i], &out_before);
+ igt_assert_crc_equal(&cleared_crc, &out_before);
+ }
+
+ /* Commit */
+ igt_plane_set_fb(plane, in_fb);
+ igt_output_set_writeback_fb(output, out_fbs[i]);
+
+ igt_display_commit_atomic(output->display,
+ DRM_MODE_ATOMIC_ALLOW_MODESET,
+ NULL);
+ if (out_fbs[i])
+ get_and_wait_out_fence(output);
+
+ /* Make sure the old output buffer is untouched */
+ if (i > 0 && out_fbs[i - 1] && (out_fbs[i] != out_fbs[i - 1])) {
+ igt_crc_t out_prev;
+ igt_fb_get_crc(out_fbs[i - 1], &out_prev);
+ igt_assert_crc_equal(&cleared_crc, &out_prev);
+ }
+
+ /* Make sure this output buffer is written */
+ if (out_fbs[i]) {
+ igt_crc_t out_after;
+ igt_fb_get_crc(out_fbs[i], &out_after);
+ igt_assert_crc_equal(&out_expected, &out_after);
+
+ /* And clear it, for the next time */
+ fill_fb(out_fbs[i], clear_color);
+ }
+ }
+}
+
+static void writeback_check_output(igt_output_t *output, igt_plane_t *plane,
+ igt_fb_t *input_fb, igt_fb_t *output_fb)
+{
+ igt_fb_t *out_fbs[2] = { 0 };
+ igt_fb_t second_out_fb;
+ int ret;
+
+ /* One commit, with a writeback. */
+ writeback_sequence(output, plane, input_fb, &output_fb, 1);
+
+ /* Two commits, the second with no writeback */
+ out_fbs[0] = output_fb;
+ writeback_sequence(output, plane, input_fb, out_fbs, 2);
+
+ /* Two commits, both with writeback */
+ out_fbs[1] = output_fb;
+ writeback_sequence(output, plane, input_fb, out_fbs, 2);
+
+ ret = igt_create_fb(output_fb->fd, output_fb->width, output_fb->height,
+ DRM_FORMAT_XRGB8888,
+ igt_fb_mod_to_tiling(0),
+ &second_out_fb);
+ igt_require(ret > 0);
+
+ /* Two commits, with different writeback buffers */
+ out_fbs[1] = &second_out_fb;
+ writeback_sequence(output, plane, input_fb, out_fbs, 2);
+
+ igt_remove_fb(output_fb->fd, &second_out_fb);
+}
+
igt_main
{
igt_display_t display;
@@ -307,6 +418,19 @@ igt_main
igt_remove_fb(display.drm_fd, &output_fb);
}

+ igt_subtest("writeback-check-output") {
+ igt_fb_t output_fb;
+ ret = igt_create_fb(display.drm_fd, mode.hdisplay, mode.vdisplay,
+ DRM_FORMAT_XRGB8888,
+ igt_fb_mod_to_tiling(0),
+ &output_fb);
+ igt_require(ret > 0);
+
+ writeback_check_output(output, plane, &input_fb, &output_fb);
+
+ igt_remove_fb(display.drm_fd, &output_fb);
+ }
+
igt_fixture {
igt_remove_fb(display.drm_fd, &input_fb);
igt_display_fini(&display);
--
2.21.0

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