[RFC] tests/intel/xe_wedged: Add new test csc-wedged

[Sk Anirban]

Inject a CSC error through uevent to cause the Xe device to enter a wedged
state. To return the device to a normal state, reload the driver, as
the wedged state can only be resolved by rebinding/reprobing the driver.

Signed-off-by: Sk Anirban <sk.anirban at intel.com>
---
 tests/intel/xe_wedged.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/tests/intel/xe_wedged.c b/tests/intel/xe_wedged.c
index 7fc7ca9eb..b37508710 100644
--- a/tests/intel/xe_wedged.c
+++ b/tests/intel/xe_wedged.c
@@ -46,6 +46,15 @@ static void force_wedged(int fd)
 	sleep(1);
 }
 
+static void force_wedged_csc_error(int fd)
+{
+	igt_debugfs_write(fd, "inject_csc_hw_error/probability", "100");
+	igt_debugfs_write(fd, "inject_csc_hw_error/times", "1");
+
+	xe_force_gt_reset_sync(fd, 0);
+	sleep(1);
+}
+
 static int simple_ioctl(int fd)
 {
 	int ret;
@@ -208,6 +217,10 @@ simple_hang(int fd, struct drm_xe_sync *sync)
  * SUBTEST: basic-wedged-read
  * Description: Read wedged_mode debugfs
  */
+/**
+ * SUBTEST: csc-wedged
+ * Description: Force Xe device wedged after injecting a failure in CSC
+ */
 igt_main
 {
 	struct drm_xe_engine_class_instance *hwe;
@@ -300,12 +313,35 @@ igt_main
 		igt_assert_f(str[0] != '\0', "Failed to read wedged_mode from debugfs!\n");
 	}
 
+	igt_subtest("csc-wedged") {
+		igt_require(igt_debugfs_exists(fd, "inject_csc_hw_error/probability",
+					       O_RDWR));
+		igt_debugfs_write(fd, "inject_csc_hw_error/verbose", "1");
+
+		igt_assert_eq(simple_ioctl(fd), 0);
+		ignore_wedged_in_dmesg();
+		force_wedged_csc_error(fd);
+
+		drm_close_driver(fd);
+		igt_kmod_rebind("xe", pci_slot);
+		fd = drm_open_driver(DRIVER_XE);
+
+		igt_assert_eq(simple_ioctl(fd), 0);
+		xe_for_each_engine(fd, hwe)
+			simple_exec(fd, hwe);
+	}
+
 	igt_fixture {
 		if (igt_debugfs_exists(fd, "fail_gt_reset/probability", O_RDWR)) {
 			igt_debugfs_write(fd, "fail_gt_reset/probability", "0");
 			igt_debugfs_write(fd, "fail_gt_reset/times", "1");
 		}
 
+		if (igt_debugfs_exists(fd, "inject_csc_hw_error/probability", O_RDWR)) {
+			igt_debugfs_write(fd, "inject_csc_hw_error/probability", "0");
+			igt_debugfs_write(fd, "inject_csc_hw_error/times", "1");
+		}
+
 		/* Tests might have failed, force a rebind before exiting */
 		drm_close_driver(fd);
 		igt_kmod_rebind("xe", pci_slot);
-- 
2.43.0