[PATCH i-g-t] tests/intel/xe_wedged: Introduce a new test for Xe device wedged state

[Rodrigo Vivi]

Let's inject a gt_reset failure that will put Xe device in the
new wedged state, then we confirm the IOCTL is blocked and we
reload the driver to get back to a clean state for other test
execution, since wedged state in Xe is a final state that can only
be cleared with a module reload.

This new test case is entirely based on xe_uevent provided by
Himal.

Cc:  Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 tests/intel/xe_wedged.c | 91 +++++++++++++++++++++++++++++++++++++++++
 tests/meson.build       |  1 +
 2 files changed, 92 insertions(+)
 create mode 100644 tests/intel/xe_wedged.c

diff --git a/tests/intel/xe_wedged.c b/tests/intel/xe_wedged.c
new file mode 100644
index 000000000..f767e2511
--- /dev/null
+++ b/tests/intel/xe_wedged.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+/**
+ * TEST: cause fake gt reset failure which put Xe device in wedged state
+ * Category: Software building block
+ * Sub-category: driver
+ * Functionality: wedged
+ * Test category: functionality test
+ */
+
+#include "igt.h"
+#include "igt_kmod.h"
+
+#include "xe/xe_ioctl.h"
+
+static void force_wedged(int fd)
+{
+	igt_debugfs_write(fd, "fail_gt_reset/probability", "100");
+	igt_debugfs_write(fd, "fail_gt_reset/times", "2");
+
+	xe_force_gt_reset(fd, 0);
+	sleep(1);
+}
+
+static int reload_xe(int fd)
+{
+	int error;
+
+	drm_close_driver(fd);
+	igt_xe_driver_unload();
+
+	error = igt_xe_driver_load(NULL);
+
+	igt_assert_eq(error, 0);
+
+	/* driver is ready, check if it's bound */
+	fd = __drm_open_driver(DRIVER_XE);
+	igt_fail_on_f(fd < 0, "Cannot open the xe DRM driver while reloading xe after wedged\n");
+	return fd;
+}
+
+static int simple_ioctl(int fd)
+{
+	int ret;
+
+	struct drm_xe_vm_create create = {
+		.extensions = 0,
+		.flags = 0,
+	};
+
+	ret = igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create);
+
+	if (ret == 0)
+		xe_vm_destroy(fd, create.vm_id);
+
+	return ret;
+}
+
+/**
+ * SUBTEST: basic-wedged
+ * Description: Force Xe device wedged after injecting a failure in GT reset
+ */
+igt_main
+{
+	int fd;
+
+	igt_fixture {
+		fd = drm_open_driver(DRIVER_XE);
+		igt_require(igt_debugfs_exists(fd, "fail_gt_reset/probability",
+					       O_RDWR));
+	}
+
+	igt_subtest("basic-wedged") {
+		igt_assert_eq(simple_ioctl(fd), 0);
+		force_wedged(fd);
+		igt_assert_neq(simple_ioctl(fd), 0);
+		fd = reload_xe(fd);
+		igt_assert_eq(simple_ioctl(fd), 0);
+	}
+
+	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");
+		}
+		drm_close_driver(fd);
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index a856510fc..e590d4348 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -312,6 +312,7 @@ intel_xe_progs = [
 	'xe_render_copy',
 	'xe_vm',
 	'xe_waitfence',
+	'xe_wedged',
 	'xe_spin_batch',
 	'xe_sysfs_defaults',
 	'xe_sysfs_scheduler',
-- 
2.44.0