[PATCH i-g-t] Skip VBlank tests in modules without VBlank

[Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>]

The kms_flip test does not support drivers without VBlank which exclude
some virtual drivers. This patch adds a function that checks if a module
has a VBlank or not; if a module has VBlank than kms_flip will execute
all the VBlank tests, otherwise, VBlank tests will be skipped.

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
---
 lib/igt_aux.c    | 14 ++++++++++++++
 lib/igt_aux.h    |  2 ++
 tests/kms_flip.c | 26 ++++++++++++++++++++++++--
 3 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index 1250d5c5..da5be4bb 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -564,6 +564,20 @@ bool igt_aub_dump_enabled(void)
 	return dump_aub;
 }
 
+bool igt_there_is_vblank(int drm_fd)
+{
+	drmVBlank dummy_vbl;
+	int ret;
+
+	dummy_vbl.request.type = DRM_VBLANK_ABSOLUTE;
+	ret = drmWaitVBlank(drm_fd, &dummy_vbl);
+
+	if (ret < 0)
+		return false;
+
+	return true;
+}
+
 /* other helpers */
 /**
  * igt_exchange_int:
diff --git a/lib/igt_aux.h b/lib/igt_aux.h
index ef89faa9..933055e8 100644
--- a/lib/igt_aux.h
+++ b/lib/igt_aux.h
@@ -119,6 +119,8 @@ bool igt_check_boolean_env_var(const char *env_var, bool default_value);
 
 bool igt_aub_dump_enabled(void);
 
+bool igt_there_is_vblank(int fd);
+
 /* suspend/hibernate and auto-resume system */
 
 /**
diff --git a/tests/kms_flip.c b/tests/kms_flip.c
index 393d690a..770fa5f7 100644
--- a/tests/kms_flip.c
+++ b/tests/kms_flip.c
@@ -73,6 +73,7 @@
 #define TEST_TS_CONT		(1 << 27)
 #define TEST_BO_TOOBIG		(1 << 28)
 
+#define TEST_NO_VBLANK		(1 << 29)
 #define TEST_BASIC		(1 << 30)
 
 #define EVENT_FLIP		(1 << 0)
@@ -125,6 +126,18 @@ struct event_state {
 	int seq_step;
 };
 
+static bool vblank_dependence(int flags)
+{
+	int vblank_flags = TEST_VBLANK | TEST_VBLANK_BLOCK |
+			   TEST_VBLANK_ABSOLUTE | TEST_VBLANK_EXPIRED_SEQ |
+			   TEST_TS_CONT | TEST_CHECK_TS | TEST_VBLANK_RACE;
+
+	if (flags & vblank_flags)
+		return true;
+
+	return false;
+}
+
 static float timeval_float(const struct timeval *tv)
 {
 	return tv->tv_sec + tv->tv_usec / 1000000.0f;
@@ -493,11 +506,11 @@ static void check_state(const struct test_output *o, const struct event_state *e
 	/* check only valid if no modeset happens in between, that increments by
 	 * (1 << 23) on each step. This bounding matches the one in
 	 * DRM_IOCTL_WAIT_VBLANK. */
-	if (!(o->flags & (TEST_DPMS | TEST_MODESET)))
+	if (!(o->flags & (TEST_DPMS | TEST_MODESET | TEST_NO_VBLANK))) {
 		igt_assert_f(es->current_seq - (es->last_seq + o->seq_step) <= 1UL << 23,
 			     "unexpected %s seq %u, should be >= %u\n",
 			     es->name, es->current_seq, es->last_seq + o->seq_step);
-
+	}
 	/* Check that the vblank frame didn't wrap unexpectedly. */
 	if (o->flags & TEST_TS_CONT) {
 		/* Ignore seq_step here since vblank waits time out immediately
@@ -1204,6 +1217,7 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
 	unsigned bo_size = 0;
 	uint64_t tiling;
 	int i;
+	bool vblank = true;
 
 	switch (crtc_count) {
 	case 1:
@@ -1297,6 +1311,14 @@ static void run_test_on_crtc_set(struct test_output *o, int *crtc_idxs,
 	}
 	igt_assert(fb_is_bound(o, o->fb_ids[0]));
 
+	vblank = igt_there_is_vblank(drm_fd);
+	if (!vblank) {
+		if (vblank_dependence(o->flags))
+			igt_require_f(vblank, "There is no Vblank\n");
+		else
+			o->flags |= TEST_NO_VBLANK;
+	}
+
 	/* quiescent the hw a bit so ensure we don't miss a single frame */
 	if (o->flags & TEST_CHECK_TS)
 		calibrate_ts(o, crtc_idxs[0]);
-- 
2.18.0
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