[PATCH igt 3/4] kms_frontbuffer_tracking: recreate the FBs at every subtest

[Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>]

We're studying the possibility to implement a Kernel FBC workaround
that will deactivate FBC every time the FBC frontbuffer was ever
CPU/WC mmapped. Due to this, we can't just reuse our FBs between
tests: the test suite will eventually CPU mmap every buffer, so FBC
will be disabled forever. In order to avoid this, keep it simple and
just recreate the FBs at every subtest.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
 tests/kms_frontbuffer_tracking.c | 40 ++++++++++++++++++++--------------------
 1 file changed, 20 insertions(+), 20 deletions(-)

diff --git a/tests/kms_frontbuffer_tracking.c b/tests/kms_frontbuffer_tracking.c
index 363fe23..aa124d3 100644
--- a/tests/kms_frontbuffer_tracking.c
+++ b/tests/kms_frontbuffer_tracking.c
@@ -662,12 +662,31 @@ static void create_shared_fb(enum pixel_format format)
 		  PLANE_PRI, &s->big);
 }
 
+static void destroy_fbs(enum pixel_format format)
+{
+	struct screen_fbs *s = &fbs[format];
+
+	if (!s->initialized)
+		return;
+
+	if (scnd_mode_params.connector_id) {
+		igt_remove_fb(drm.fd, &s->scnd_pri);
+		igt_remove_fb(drm.fd, &s->scnd_cur);
+		igt_remove_fb(drm.fd, &s->scnd_spr);
+	}
+	igt_remove_fb(drm.fd, &s->prim_pri);
+	igt_remove_fb(drm.fd, &s->prim_cur);
+	igt_remove_fb(drm.fd, &s->prim_spr);
+	igt_remove_fb(drm.fd, &s->offscreen);
+	igt_remove_fb(drm.fd, &s->big);
+}
+
 static void create_fbs(enum pixel_format format)
 {
 	struct screen_fbs *s = &fbs[format];
 
 	if (s->initialized)
-		return;
+		destroy_fbs(format);
 
 	s->initialized = true;
 
@@ -698,25 +717,6 @@ static void create_fbs(enum pixel_format format)
 		  LOCAL_I915_FORMAT_MOD_X_TILED, PLANE_SPR, &s->scnd_spr);
 }
 
-static void destroy_fbs(enum pixel_format format)
-{
-	struct screen_fbs *s = &fbs[format];
-
-	if (!s->initialized)
-		return;
-
-	if (scnd_mode_params.connector_id) {
-		igt_remove_fb(drm.fd, &s->scnd_pri);
-		igt_remove_fb(drm.fd, &s->scnd_cur);
-		igt_remove_fb(drm.fd, &s->scnd_spr);
-	}
-	igt_remove_fb(drm.fd, &s->prim_pri);
-	igt_remove_fb(drm.fd, &s->prim_cur);
-	igt_remove_fb(drm.fd, &s->prim_spr);
-	igt_remove_fb(drm.fd, &s->offscreen);
-	igt_remove_fb(drm.fd, &s->big);
-}
-
 static bool set_mode_for_params(struct modeset_params *params)
 {
 	int rc;
-- 
2.7.0

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