[igt-dev] [PATCH v7 i-g-t] tests/kms_flip: Skip VBlank tests in modules without VBlank

Rodrigo Siqueira
2019-04-23T14:18:02Z

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The kms_flip test relies on VBlank support, and this situation may
exclude some virtual drivers to take advantage of this set of tests.
This commit adds a mechanism that checks if a module has VBlank. If the
target module has VBlank support, kms_flip will run all the VBlank
tests; otherwise, the VBlank tests will be skipped. Additionally, this
commit improves the test coverage by checks if the function
drmWaitVBlank() returns EOPNOTSUPP (i.e., no VBlank support).

V6: Set errno to zero before call drmWaitVBlank()

V5: Drop the DRM_VBLANK_NEXTONMISS (Chris Wilson)

V4: Replace DRM_VBLANK_ABSOLUTE by DRM_VBLANK_RELATIVE and
DRM_VBLANK_NEXTONMISS

V3: Add documentation (Daniel Vetter)

V2: Add new branch coverage to check if VBlank is enabled or not and
update commit message

V1: Chris Wilson
- Change function name from igt_there_is_vblank to kms_has_vblank
- Move vblank function check from igt_aux to igt_kms
- Utilizes memset in dummy_vbl variable
- Directly return the result of drmWaitVBlank()

Signed-off-by: Rodrigo Siqueira <rodrigosiqueiramelo@gmail.com>
---
lib/igt_kms.c | 21 +++++++++++++++++++++
lib/igt_kms.h | 2 ++
tests/kms_flip.c | 22 ++++++++++++++++++++++
3 files changed, 45 insertions(+)

diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index df9aafd2..ca3073a0 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -1656,6 +1656,27 @@ void igt_assert_plane_visible(int fd, enum pipe pipe, int plane_index, bool visi
igt_assert_eq(visible, visibility);
}

+/**
+ * kms_has_vblank:
+ * @fd: DRM fd
+ *
+ * Get the VBlank errno after an attempt to call drmWaitVBlank(). This
+ * function is useful for checking if a driver has support or not for VBlank.
+ *
+ * Returns: true if target driver has VBlank support, otherwise return false.
+ */
+bool kms_has_vblank(int fd)
+{
+ drmVBlank dummy_vbl;
+
+ memset(&dummy_vbl, 0, sizeof(drmVBlank));
+ dummy_vbl.request.type = DRM_VBLANK_RELATIVE;
+
+ errno = 0;
+ drmWaitVBlank(fd, &dummy_vbl);
+ return (errno != EOPNOTSUPP);
+}
+
/*
* A small modeset API
*/
diff --git a/lib/igt_kms.h b/lib/igt_kms.h
index 38bdc08f..b0ff79ab 100644
--- a/lib/igt_kms.h
+++ b/lib/igt_kms.h
@@ -230,6 +230,8 @@ void kmstest_wait_for_pageflip(int fd);
unsigned int kmstest_get_vblank(int fd, int pipe, unsigned int flags);
void igt_assert_plane_visible(int fd, enum pipe pipe, int plane_index, bool visibility);

+bool kms_has_vblank(int fd);
+
/*
* A small modeset API
*/
diff --git a/tests/kms_flip.c b/tests/kms_flip.c
index 6287ce14..4e0471a9 100755
--- a/tests/kms_flip.c
+++ b/tests/kms_flip.c
@@ -71,6 +71,7 @@
#define TEST_SUSPEND (1 << 26)
#define TEST_BO_TOOBIG (1 << 28)

+#define TEST_NO_VBLANK (1 << 29)
#define TEST_BASIC (1 << 30)

#define EVENT_FLIP (1 << 0)
@@ -126,6 +127,18 @@ 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_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;
@@ -1176,6 +1189,7 @@ 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 RUN_TEST:
@@ -1259,6 +1273,14 @@ 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 = kms_has_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]);
--
2.21.0

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