[PATCH v3 2/7] drm/xe: Set GT as wedged before sending wedged uevent

[Raag Jadav]

On Wed, Jul 02, 2025 at 07:41:12PM +0530, Riana Tauro wrote:
> Userspace should be notified after setting the device as wedged.
> Re-order function calls to set gt wedged before sending uevent.
> 
> Suggested-by: Raag Jadav <raag.jadav at intel.com>
> Signed-off-by: Riana Tauro <riana.tauro at intel.com>
> ---
>  drivers/gpu/drm/xe/xe_device.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
> index 0b73cb72bad1..4a38486dccc8 100644
> --- a/drivers/gpu/drm/xe/xe_device.c
> +++ b/drivers/gpu/drm/xe/xe_device.c
> @@ -1123,8 +1123,10 @@ static void xe_device_wedged_fini(struct drm_device *drm, void *arg)
>   * xe_device_declare_wedged - Declare device wedged
>   * @xe: xe device instance
>   *
> - * This is a final state that can only be cleared with a module
> + * This is a final state that can only be cleared with the recovery method
> + * specified in the drm wedged uevent. The default recovery method is
>   * re-probe (unbind + bind).
> + *
>   * In this state every IOCTL will be blocked so the GT cannot be used.
>   * In general it will be called upon any critical error such as gt reset
>   * failure or guc loading failure. Userspace will be notified of this state
> @@ -1151,6 +1153,9 @@ void xe_device_declare_wedged(struct xe_device *xe)
>  		return;
>  	}
>  
> +	for_each_gt(gt, xe, id)
> +		xe_gt_declare_wedged(gt);

This is changing GuC CT state and can race with ioctls, so I think
the sequence should be

 	if (!atomic_xchg(&xe->wedged.flag, 1)) {
		...
	}

	for_each_gt(gt, xe, id)
		xe_gt_declare_wedged(gt);

	if (xe_device_wedged())
		drm_dev_wedged_event();

Raag