tests/kms_addfb: Add support for fb modifiers

Just a few basic tests to make sure fb modifiers can be used and
behave sanely when mixed with the old set_tiling API.

v2:
   * Review feedback from Daniel Vetter:
      1. Move cap detection into the subtest so skipping works.
      2. Added some gtkdoc comments.
      3. Two more test cases.
      4. Removed unused parts for now.

v3:
   * Removed two tests which do not make sense any more after the
     fb modifier rewrite.

v4:
   * Moved gtkdoc comments into .c file.
   * Moved all initialization into fixtures.
   * Rebased for fb modifier changes.

v5:
   * Added bad modifier subtest.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index 66c90de0..5cbb8738 100644
--- a/lib/ioctl_wrappers.c
+++ b/lib/ioctl_wrappers.c
@@ -1142,3 +1142,26 @@ off_t prime_get_size(int dma_buf_fd)
 
 	return ret;
 }
+
+/**
+ * igt_require_fb_modifiers:
+ * @fd: Open DRM file descriptor.
+ *
+ * Requires presence of DRM_CAP_ADDFB2_MODIFIERS.
+ */
+void igt_require_fb_modifiers(int fd)
+{
+	static bool has_modifiers, cap_modifiers_tested;
+
+	if (!cap_modifiers_tested) {
+		uint64_t cap_modifiers;
+		int ret;
+
+		ret = drmGetCap(fd, LOCAL_DRM_CAP_ADDFB2_MODIFIERS, &cap_modifiers);
+		igt_assert(ret == 0 || errno == EINVAL);
+		has_modifiers = ret == 0 && cap_modifiers == 1;
+		cap_modifiers_tested = true;
+	}
+
+	igt_require(has_modifiers);
+}