[PATCH] drm/xe: Allow fault injection in exec queue IOCTLs

[Francois Dugast]

Use fault injection infrastructure to allow specific functions to
be configured over debugfs for failing during the execution of
xe_exec_queue_create_ioctl(). xe_exec_queue_destroy_ioctl() and
xe_exec_queue_get_property_ioctl() are not considered as there is
no unwinding code to test with fault injection.

This allows more thorough testing from user space by going through
code paths for error handling and unwinding which cannot be reached
by simply injecting errors in IOCTL arguments. This can help
increase code robustness.

The corresponding IGT series is:
https://patchwork.freedesktop.org/series/144138/

Signed-off-by: Francois Dugast <francois.dugast at intel.com>
---
 drivers/gpu/drm/xe/xe_exec_queue.c      | 1 +
 drivers/gpu/drm/xe/xe_hw_engine_group.c | 1 +
 drivers/gpu/drm/xe/xe_vm.c              | 1 +
 3 files changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_exec_queue.c b/drivers/gpu/drm/xe/xe_exec_queue.c
index 7c5c003d3c40..606922d9dd73 100644
--- a/drivers/gpu/drm/xe/xe_exec_queue.c
+++ b/drivers/gpu/drm/xe/xe_exec_queue.c
@@ -203,6 +203,7 @@ struct xe_exec_queue *xe_exec_queue_create(struct xe_device *xe, struct xe_vm *v
 	__xe_exec_queue_free(q);
 	return ERR_PTR(err);
 }
+ALLOW_ERROR_INJECTION(xe_exec_queue_create, ERRNO);
 
 struct xe_exec_queue *xe_exec_queue_create_class(struct xe_device *xe, struct xe_gt *gt,
 						 struct xe_vm *vm,
diff --git a/drivers/gpu/drm/xe/xe_hw_engine_group.c b/drivers/gpu/drm/xe/xe_hw_engine_group.c
index 82750520a90a..2d68c5b5262a 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine_group.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine_group.c
@@ -178,6 +178,7 @@ int xe_hw_engine_group_add_exec_queue(struct xe_hw_engine_group *group, struct x
 	up_write(&group->mode_sem);
 	return err;
 }
+ALLOW_ERROR_INJECTION(xe_hw_engine_group_add_exec_queue, ERRNO);
 
 /**
  * xe_hw_engine_group_del_exec_queue() - Delete an exec queue from a hw engine group
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index 3dbd3d38008a..338d98533fae 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -270,6 +270,7 @@ int xe_vm_add_compute_exec_queue(struct xe_vm *vm, struct xe_exec_queue *q)
 
 	return err;
 }
+ALLOW_ERROR_INJECTION(xe_vm_add_compute_exec_queue, ERRNO);
 
 /**
  * xe_vm_remove_compute_exec_queue() - Remove compute exec queue from VM
-- 
2.43.0