[PATCH v6 1/4] lib/ioctl_wrappers: let the caller handle capability check result

["André Almeida" <andrealmeid@igalia.com>]

From: Melissa Wen <mwen@igalia.com>

Rework igt_has_drm_cap to just check if a DRM capability is supported
and let the called decide what to do from this check. It prevents the
test fails because of an assert done when it's called in
igt_subtest_with_dynamics.

Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: André Almeida <andrealmeid@igalia.com>
---
 lib/ioctl_wrappers.c    | 13 ++++++++-----
 lib/ioctl_wrappers.h    |  2 +-
 tests/kms_async_flips.c | 13 +++++++++----
 3 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 146973f0d..33f593295 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -1288,14 +1288,17 @@ int __kms_addfb(int fd, uint32_t handle,
  * This helper verifies if the passed capability is
  * supported by the kernel
  *
- * Returns: Whether the capability is supported or not.
+ * Returns: negative value if error, 0 if cap is not supported, 1 if cap is
+ * supported.
  */
-bool igt_has_drm_cap(int fd, uint64_t capability)
+int igt_has_drm_cap(int fd, uint64_t capability)
 {
-	struct drm_get_cap cap = { .capability = capability };
+	uint64_t value = 0;
+
+	if (drmGetCap(fd, capability, &value))
+		return -errno;
 
-	igt_assert(drmIoctl(fd, DRM_IOCTL_GET_CAP, &cap) == 0);
-	return cap.value;
+	return value ? 1 : 0;
 }
 
 /**
diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h
index b7d7c2ad9..7cf05e626 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h
@@ -144,7 +144,7 @@ void prime_sync_end(int dma_buf_fd, bool write);
 
 bool igt_has_fb_modifiers(int fd);
 void igt_require_fb_modifiers(int fd);
-bool igt_has_drm_cap(int fd, uint64_t capability);
+int igt_has_drm_cap(int fd, uint64_t capability);
 bool igt_has_set_caching(uint32_t devid);
 
 /**
diff --git a/tests/kms_async_flips.c b/tests/kms_async_flips.c
index da426f753..126b96d6b 100644
--- a/tests/kms_async_flips.c
+++ b/tests/kms_async_flips.c
@@ -203,8 +203,10 @@ static void make_fb(data_t *data, struct igt_fb *fb,
 
 static void require_monotonic_timestamp(int fd)
 {
-	igt_require_f(igt_has_drm_cap(fd, DRM_CAP_TIMESTAMP_MONOTONIC),
-		      "Monotonic timestamps not supported\n");
+	int ret = igt_has_drm_cap(fd, DRM_CAP_TIMESTAMP_MONOTONIC);
+
+	igt_assert(ret >= 0);
+	igt_require_f(ret, "Monotonic timestamps not supported\n");
 }
 
 static void test_init(data_t *data)
@@ -747,13 +749,16 @@ igt_main
 	int i;
 
 	igt_fixture {
+		int ret;
+
 		data.drm_fd = drm_open_driver_master(DRIVER_ANY);
 		kmstest_set_vt_graphics_mode();
 		igt_display_require(&data.display, data.drm_fd);
 		igt_display_require_output(&data.display);
 
-		igt_require_f(igt_has_drm_cap(data.drm_fd, DRM_CAP_ASYNC_PAGE_FLIP),
-			      "Async Flip is not supported\n");
+		ret = igt_has_drm_cap(data.drm_fd, DRM_CAP_ASYNC_PAGE_FLIP);
+		igt_assert(ret >= 0);
+		igt_require_f(ret, "Async Flip is not supported\n");
 
 		if (is_intel_device(data.drm_fd))
 			data.bops = buf_ops_create(data.drm_fd);
-- 
2.49.0