[PATCH 2/2] drm/xe: Introduce fault injection for guc CTB send/recv

[Satyanarayana K V P]

Fault can be injected with below steps.

FAILTYPE=fail_function
FAILFUNC=xe_guc_ct_send_recv

echo > /sys/kernel/debug/$FAILTYPE/inject
echo $FAILFUNC > /sys/kernel/debug/$FAILTYPE/inject
printf %#x -19 > /sys/kernel/debug/$FAILTYPE/$FAILFUNC/retval

echo N > /sys/kernel/debug/$FAILTYPE/task-filter
echo 10 > /sys/kernel/debug/$FAILTYPE/probability
echo 0 > /sys/kernel/debug/$FAILTYPE/interval
echo -1 > /sys/kernel/debug/$FAILTYPE/times
echo 0 > /sys/kernel/debug/$FAILTYPE/space
echo 1 > /sys/kernel/debug/$FAILTYPE/verbose

Signed-off-by: Satyanarayana K V P <satyanarayana.k.v.p at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Michał Wajdeczko <michal.wajdeczko at intel.com>
---
 drivers/gpu/drm/xe/xe_guc_ct.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index 7d33f3a11e61..d9cf83e74e2f 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -1088,6 +1088,7 @@ int xe_guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len,
 	KUNIT_STATIC_STUB_REDIRECT(xe_guc_ct_send_recv, ct, action, len, response_buffer);
 	return guc_ct_send_recv(ct, action, len, response_buffer, false);
 }
+ALLOW_ERROR_INJECTION(xe_guc_ct_send_recv, ERRNO);
 
 int xe_guc_ct_send_recv_no_fail(struct xe_guc_ct *ct, const u32 *action,
 				u32 len, u32 *response_buffer)
-- 
2.35.3