diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c
index cd6884a..0ab25c4 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);
+}
diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h
index 7c0c87e..3c85e8b 100644
--- a/lib/ioctl_wrappers.h
+++ b/lib/ioctl_wrappers.h
@@ -135,4 +135,34 @@ int prime_handle_to_fd(int fd, uint32_t handle);
 uint32_t prime_fd_to_handle(int fd, int dma_buf_fd);
 off_t prime_get_size(int dma_buf_fd);
 
+/* addfb2 fb modifiers */
+struct local_drm_mode_fb_cmd2 {
+	uint32_t fb_id;
+	uint32_t width, height;
+	uint32_t pixel_format;
+	uint32_t flags;
+	uint32_t handles[4];
+	uint32_t pitches[4];
+	uint32_t offsets[4];
+	uint64_t modifier[4];
+};
+
+#define LOCAL_DRM_MODE_FB_MODIFIERS	(1<<1)
+
+#define LOCAL_DRM_FORMAT_MOD_VENDOR_INTEL	0x01
+
+#define local_fourcc_mod_code(vendor, val) \
+		((((uint64_t)LOCAL_DRM_FORMAT_MOD_VENDOR_## vendor) << 56) | \
+		(val & 0x00ffffffffffffffL))
+
+#define LOCAL_DRM_FORMAT_MOD_NONE	(0)
+#define LOCAL_I915_FORMAT_MOD_X_TILED	local_fourcc_mod_code(INTEL, 1)
+
+#define LOCAL_DRM_IOCTL_MODE_ADDFB2	DRM_IOWR(0xB8, \
+						 struct local_drm_mode_fb_cmd2)
+
+#define LOCAL_DRM_CAP_ADDFB2_MODIFIERS	0x10
+
+void igt_require_fb_modifiers(int fd);
+
 #endif /* IOCTL_WRAPPERS_H */
diff --git a/tests/kms_addfb.c b/tests/kms_addfb.c
index 756589e..58a23ea 100644
--- a/tests/kms_addfb.c
+++ b/tests/kms_addfb.c
@@ -213,6 +213,79 @@ static void size_tests(int fd)
 	}
 }
 
+static void addfb25_tests(int fd)
+{
+	struct local_drm_mode_fb_cmd2 f = {};
+
+	igt_fixture {
+		gem_bo = gem_create(fd, 1024*1024*4);
+		igt_assert(gem_bo);
+
+		memset(&f, 0, sizeof(f));
+
+		f.width = 1024;
+		f.height = 1024;
+		f.pixel_format = DRM_FORMAT_XRGB8888;
+		f.pitches[0] = 1024*4;
+		f.modifier[0] = LOCAL_DRM_FORMAT_MOD_NONE;
+
+		f.handles[0] = gem_bo;
+	}
+
+	igt_subtest("addfb25-modifier-no-flag") {
+		igt_require_fb_modifiers(fd);
+
+		f.modifier[0] = LOCAL_I915_FORMAT_MOD_X_TILED;
+		igt_assert(drmIoctl(fd, LOCAL_DRM_IOCTL_MODE_ADDFB2, &f) < 0 && errno == EINVAL);
+	}
+
+	igt_fixture {
+		f.flags = LOCAL_DRM_MODE_FB_MODIFIERS;
+	}
+
+	igt_subtest("addfb25-bad-modifier") {
+		igt_require_fb_modifiers(fd);
+
+		f.modifier[0] = ~0;
+		igt_assert(drmIoctl(fd, LOCAL_DRM_IOCTL_MODE_ADDFB2, &f) < 0 && errno == EINVAL);
+	}
+
+	igt_fixture {
+		gem_set_tiling(fd, gem_bo, I915_TILING_X, 1024*4);
+	}
+
+	igt_subtest("addfb25-X-tiled-mismatch") {
+		igt_require_fb_modifiers(fd);
+
+		f.modifier[0] = LOCAL_DRM_FORMAT_MOD_NONE;
+		igt_assert(drmIoctl(fd, LOCAL_DRM_IOCTL_MODE_ADDFB2, &f) < 0 && errno == EINVAL);
+	}
+
+	igt_subtest("addfb25-X-tiled") {
+		igt_require_fb_modifiers(fd);
+
+		f.modifier[0] = LOCAL_I915_FORMAT_MOD_X_TILED;
+		igt_assert(drmIoctl(fd, LOCAL_DRM_IOCTL_MODE_ADDFB2, &f) == 0);
+		igt_assert(drmIoctl(fd, DRM_IOCTL_MODE_RMFB, &f.fb_id) == 0);
+		f.fb_id = 0;
+	}
+
+	igt_subtest("addfb25-framebuffer-vs-set-tiling") {
+		igt_require_fb_modifiers(fd);
+
+		f.modifier[0] = LOCAL_I915_FORMAT_MOD_X_TILED;
+		igt_assert(drmIoctl(fd, LOCAL_DRM_IOCTL_MODE_ADDFB2, &f) == 0);
+		igt_assert(__gem_set_tiling(fd, gem_bo, I915_TILING_X, 512*4) == -EBUSY);
+		igt_assert(__gem_set_tiling(fd, gem_bo, I915_TILING_X, 1024*4) == -EBUSY);
+		igt_assert(drmIoctl(fd, DRM_IOCTL_MODE_RMFB, &f.fb_id) == 0);
+		f.fb_id = 0;
+	}
+
+	igt_fixture {
+		gem_close(fd, gem_bo);
+	}
+}
+
 int fd;
 
 igt_main
@@ -224,6 +297,8 @@ igt_main
 
 	size_tests(fd);
 
+	addfb25_tests(fd);
+
 	igt_fixture
 		close(fd);
 }
