[igt-dev] [PATCH i-g-t 1/5] igt/kms_getfb: Check the iface exists before use

[Chris Wilson]

If the driver doesn't support the getfb iface (e.g. because KMS has been
disabled), the ioctls will fail with ENOTSUP. This is expected, so skip
the test as nothing useful can be learnt.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/kms_getfb.c | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/tests/kms_getfb.c b/tests/kms_getfb.c
index 81d796a42..71d65488f 100644
--- a/tests/kms_getfb.c
+++ b/tests/kms_getfb.c
@@ -40,6 +40,40 @@
 #include "drm.h"
 #include "drm_fourcc.h"
 
+static bool has_getfb_iface(int fd)
+{
+	struct drm_mode_fb_cmd arg = { };
+	int err;
+
+	err = 0;
+	if (drmIoctl(fd, DRM_IOCTL_MODE_GETFB, &arg))
+		err = -errno;
+	switch (err) {
+	case -ENOTTY: /* ioctl unrecognised (kernel too old) */
+	case -ENOTSUP: /* driver doesn't support KMS */
+		return false;
+	default:
+		return true;
+	}
+}
+
+static bool has_addfb2_iface(int fd)
+{
+	struct drm_mode_fb_cmd2 arg = { };
+	int err;
+
+	err = 0;
+	if (drmIoctl(fd, DRM_IOCTL_MODE_ADDFB2, &arg) == 0)
+		err = -errno;
+	switch (err) {
+	case -ENOTTY: /* ioctl unrecognised (kernel too old) */
+	case -ENOTSUP: /* driver doesn't support KMS */
+		return false;
+	default:
+		return true;
+	}
+}
+
 static void get_ccs_fb(int fd, struct drm_mode_fb_cmd2 *ret)
 {
 	struct drm_mode_fb_cmd2 add = {
@@ -54,6 +88,7 @@ static void get_ccs_fb(int fd, struct drm_mode_fb_cmd2 *ret)
 	};
 	int size;
 
+	igt_require(has_addfb2_iface(fd));
 	igt_require_intel(fd);
 
 	/* An explanation of the magic numbers can be found in kms_ccs.c. */
@@ -191,15 +226,16 @@ static void test_duplicate_handles(int fd)
 		do_ioctl(fd, DRM_IOCTL_MODE_RMFB, &add.fb_id);
 		gem_close(fd, add.handles[0]);
 	}
-
 }
 
 igt_main
 {
 	int fd;
 
-	igt_fixture
+	igt_fixture {
 		fd = drm_open_driver_master(DRIVER_ANY);
+		igt_require(has_getfb_iface(fd));
+	}
 
 	igt_subtest_group
 		test_handle_input(fd);
-- 
2.19.0