[igt-dev] [PATCH i-g-t v9 3/3] igt/tests/kms_atomic_transition: Tolerate if can't have all planes

[Stanislav Lisovskiy]

With some upcoming changes i915 might not allow
all sprite planes enabled, depending on available
bandwidth limitation. Thus the test need to decrement
amount of planes and try again, instead of panicking.

v2: Removed excessive nested conditions, making code a bit
    more readable(hopefully).

v3: Stopped using global n_planes variable as it might cause
    resources being unreleased.
    Using now parms[i].mask as a way to determine if plane
    has to be included into commit.

v4: Removed unneeded n_overlays initialization.

v5: Randomize which of sprite planes to remove if hitting
    resource limits.

v6: Replace igt_warn with igt_info, to make IGT tests happier.

v7: Removed unneeded retry logic, made plane random removal simplier.
    Great thanks to Maarten Lankhorst for suggestions.

v8: Fail if we have less than 3 planes

v9: Remove unneeded diffs

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
---
 tests/kms_atomic_transition.c | 78 +++++++++++++++++++++--------------
 1 file changed, 47 insertions(+), 31 deletions(-)

diff --git a/tests/kms_atomic_transition.c b/tests/kms_atomic_transition.c
index a59be38a..1540daa2 100644
--- a/tests/kms_atomic_transition.c
+++ b/tests/kms_atomic_transition.c
@@ -184,6 +184,9 @@ static void set_sprite_wh(igt_display_t *display, enum pipe pipe,
 		    plane->type == DRM_PLANE_TYPE_CURSOR)
 			continue;
 
+		if (!parms[i].mask)
+			continue;
+
 		parms[i].width = w;
 		parms[i].height = h;
 	}
@@ -287,7 +290,7 @@ static void setup_parms(igt_display_t *display, enum pipe pipe,
 	max_sprite_width = (sprite_width == mode->hdisplay);
 	max_sprite_height = (sprite_height == mode->vdisplay);
 
-	while (1) {
+	while (!max_sprite_width && !max_sprite_height) {
 		int ret;
 
 		set_sprite_wh(display, pipe, parms, sprite_fb,
@@ -297,46 +300,60 @@ static void setup_parms(igt_display_t *display, enum pipe pipe,
 		ret = igt_display_try_commit_atomic(display, DRM_MODE_ATOMIC_TEST_ONLY | DRM_MODE_ATOMIC_ALLOW_MODESET, NULL);
 		igt_assert(!is_atomic_check_failure_errno(ret));
 
-		if (is_atomic_check_plane_size_errno(ret)) {
-			sprite_width = prev_w;
-			sprite_height = prev_h;
-
-			if (max_sprite_width && max_sprite_height) {
-				set_sprite_wh(display, pipe, parms, sprite_fb,
-					      alpha, sprite_width, sprite_height);
-				break;
-			}
-
-			if (!max_sprite_width)
-				max_sprite_width = true;
-			else
-				max_sprite_height = true;
-		} else {
+		if (!is_atomic_check_plane_size_errno(ret)) {
 			prev_w = sprite_width;
 			prev_h = sprite_height;
-		}
-
-		if (!max_sprite_width) {
-			sprite_width *= 2;
-
+			sprite_width *= max_sprite_width ? 1 : 2;
 			if (sprite_width >= mode->hdisplay) {
 				max_sprite_width = true;
 
 				sprite_width = mode->hdisplay;
 			}
-		} else if (!max_sprite_height) {
-			sprite_height *= 2;
 
+			sprite_height *= max_sprite_height ? 1 : 2;
 			if (sprite_height >= mode->vdisplay) {
 				max_sprite_height = true;
 
 				sprite_height = mode->vdisplay;
 			}
-		} else
-			/* Max sized sprites for all! */
-			break;
+			continue;
+		}
+
+		if (cursor_width == sprite_width &&
+		    cursor_height == sprite_height) {
+			igt_plane_t *removed_plane = NULL;
+			igt_assert_f(n_planes >= 3, "No planes left to proceed with!");
+			if (n_overlays > 0) {
+				uint32_t plane_to_remove = hars_petruska_f54_1_random_unsafe_max(n_overlays);
+				removed_plane = &display->pipes[pipe].planes[overlays[plane_to_remove]];
+				igt_plane_set_fb(removed_plane, NULL);
+				while (plane_to_remove < (n_overlays - 1)) {
+					overlays[plane_to_remove] = overlays[plane_to_remove + 1];
+					plane_to_remove++;
+				}
+				n_overlays--;
+			}
+			if (removed_plane) {
+				parms[removed_plane->index].mask = 0;
+				igt_info("Removed plane %d\n", removed_plane->index);
+			}
+			n_planes--;
+			igt_info("Reduced available planes to %d\n", n_planes);
+			continue;
+		}
+
+		sprite_width = prev_w;
+		sprite_height = prev_h;
+
+		if (!max_sprite_width)
+			max_sprite_width = true;
+		else
+			max_sprite_height = true;
 	}
 
+	set_sprite_wh(display, pipe, parms, sprite_fb,
+			alpha, sprite_width, sprite_height);
+
 	igt_info("Running test on pipe %s with resolution %dx%d and sprite size %dx%d alpha %i\n",
 		 kmstest_pipe_name(pipe), mode->hdisplay, mode->vdisplay,
 		 sprite_width, sprite_height, alpha);
@@ -490,9 +507,6 @@ run_transition_test(igt_display_t *display, enum pipe pipe, igt_output_t *output
 			    plane->type == DRM_PLANE_TYPE_CURSOR)
 				continue;
 
-			if (parms[i].width <= 512)
-				continue;
-
 			parms[i].width /= 2;
 			ret = 1;
 			igt_info("Reducing sprite %i to %ux%u\n", i - 1, parms[i].width, parms[i].height);
@@ -517,8 +531,10 @@ run_transition_test(igt_display_t *display, enum pipe pipe, igt_output_t *output
 		}
 
 		/* force planes to be part of commit */
-		for_each_plane_on_pipe(display, pipe, plane)
-			igt_plane_set_position(plane, 0, 0);
+		for_each_plane_on_pipe(display, pipe, plane) {
+			if (parms[plane->index].mask)
+				igt_plane_set_position(plane, 0, 0);
+		}
 
 		igt_display_commit2(display, COMMIT_ATOMIC);
 
-- 
2.17.1