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

[Michal Wajdeczko]

On 03.04.2025 14:06, Satyanarayana K V P wrote:
> 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 686fe664c20d..4852f08dd370 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)

Reviewed-by: Michal Wajdeczko <michal.wajdeczko at intel.com>