[PATCH i-g-t, v3] tests/intel: Add tests to run suspend without display

[Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>]

Add tests to validate basic execution suspend/resume cycle
without display module to rule out display related issues
from the suspend/resume stack.

v2: Add normal reload cycle after running test (Anshuman)

v3: Rebase

Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Reviewed-by: Anshuman Gupta <anshuman.gupta@intel.com>
---
 tests/intel/xe_pm.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/tests/intel/xe_pm.c b/tests/intel/xe_pm.c
index 8b115e2f6..03f742265 100644
--- a/tests/intel/xe_pm.c
+++ b/tests/intel/xe_pm.c
@@ -17,6 +17,7 @@
 
 #include "igt.h"
 #include "lib/igt_device.h"
+#include "lib/igt_kmod.h"
 #include "lib/igt_pm.h"
 #include "lib/igt_sysfs.h"
 #include "lib/igt_syncobj.h"
@@ -229,6 +230,10 @@ static void close_fw_handle(int sig)
  * Description: suspend/autoresume on %arg[1] state and exec after RPM
  * Functionality: pm - %arg[1]
  *
+ * SUBTEST: %s-without-display
+ * Description: suspend/autoresume on %arg[1] state without display
+ * Functionality: pm - %arg[1]
+ *
  * arg[1]:
  *
  * @s2idle:	s2idle
@@ -681,6 +686,7 @@ igt_main
 	struct drm_xe_engine_class_instance *hwe;
 	device_t device;
 	uint32_t d3cold_allowed;
+	const char *opts;
 	int sysfs_fd;
 
 	const struct s_state {
@@ -757,6 +763,34 @@ igt_main
 					  NO_RPM, 0);
 		}
 
+		igt_subtest_f("%s-without-display", s->name) {
+
+			if (!drmModeGetResources(device.fd_xe))
+				return;
+
+			xe_for_each_engine(device.fd_xe, hwe) {
+
+				igt_debug("Reload w/o display\n");
+
+				igt_kmsg(KMSG_INFO "Unloading Xe\n");
+				igt_assert_eq(igt_xe_driver_unload(), 0);
+
+				igt_kmsg(KMSG_INFO "Re-loading Xe without display\n");
+				igt_assert_eq(igt_xe_driver_load("enable_display=0"), 0);
+
+				test_exec(device, hwe, 1, 2, s->state,
+					  NO_RPM, 0);
+
+				igt_debug("Reload as normal\n");
+
+				igt_kmsg(KMSG_INFO "Unloading Xe\n");
+				igt_assert_eq(igt_xe_driver_unload(), 0);
+
+				igt_kmsg(KMSG_INFO "Re-loading Xe\n");
+				igt_assert_eq(igt_xe_driver_load(opts), 0);
+			}
+		}
+
 		for (const struct vm_op *op = vm_op; op->name; op++) {
 			igt_subtest_f("%s-vm-bind-%s", s->name, op->name) {
 				xe_for_each_engine(device.fd_xe, hwe)
-- 
2.34.1