[PATCH v3 1/7] drm: Add a vendor-specific recovery method to device wedged uevent
Raag Jadav
raag.jadav at intel.com
Thu Jul 3 04:06:19 UTC 2025
On Wed, Jul 02, 2025 at 07:41:11PM +0530, Riana Tauro wrote:
> Certain errors can cause the device to be wedged and may
> require a vendor specific recovery method to restore normal
> operation.
>
> Add a recovery method 'WEDGED=vendor-specific' for such errors. Vendors
> must provide additional recovery documentation if this method
> is used.
>
> Cc: André Almeida <andrealmeid at igalia.com>
> Cc: Christian König <christian.koenig at amd.com>
> Cc: David Airlie <airlied at gmail.com>
> Cc: <dri-devel at lists.freedesktop.org>
> Suggested-by: Raag Jadav <raag.jadav at intel.com>
> Signed-off-by: Riana Tauro <riana.tauro at intel.com>
> ---
> Documentation/gpu/drm-uapi.rst | 5 ++++-
> drivers/gpu/drm/drm_drv.c | 2 ++
> include/drm/drm_device.h | 4 ++++
> 3 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/gpu/drm-uapi.rst b/Documentation/gpu/drm-uapi.rst
> index 263e5a97c080..1ea835a3fc66 100644
> --- a/Documentation/gpu/drm-uapi.rst
> +++ b/Documentation/gpu/drm-uapi.rst
> @@ -424,7 +424,9 @@ uevent environment as ``WEDGED=<method1>[,..,<methodN>]`` in order of less to
> more side-effects. If driver is unsure about recovery or method is unknown
> (like soft/hard system reboot, firmware flashing, physical device replacement
> or any other procedure which can't be attempted on the fly), ``WEDGED=unknown``
We may also want to remove the examples for unknown method so that we
don't confuse users in case any of it overlaps with vendor-specific.
> -will be sent instead.
> +will be sent instead. If recovery method is specific to vendor
> +``WEDGED=vendor-specific`` will be sent and userspace should refer to vendor
> +specific documentation for further recovery steps.
>
> Userspace consumers can parse this event and attempt recovery as per the
> following expectations.
> @@ -435,6 +437,7 @@ following expectations.
> none optional telemetry collection
> rebind unbind + bind driver
> bus-reset unbind + bus reset/re-enumeration + bind
> + vendor-specific vendor specific recovery method
> unknown consumer policy
> =============== ========================================
>
> diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> index 02556363e918..c72e5c67479d 100644
> --- a/drivers/gpu/drm/drm_drv.c
> +++ b/drivers/gpu/drm/drm_drv.c
> @@ -535,6 +535,8 @@ static const char *drm_get_wedge_recovery(unsigned int opt)
> return "rebind";
> case DRM_WEDGE_RECOVERY_BUS_RESET:
> return "bus-reset";
> + case DRM_WEDGE_RECOVERY_VENDOR:
> + return "vendor-specific";
> default:
> return NULL;
> }
> diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h
> index 08b3b2467c4c..40a4caaa6313 100644
> --- a/include/drm/drm_device.h
> +++ b/include/drm/drm_device.h
> @@ -26,10 +26,14 @@ struct pci_controller;
> * Recovery methods for wedged device in order of less to more side-effects.
> * To be used with drm_dev_wedged_event() as recovery @method. Callers can
> * use any one, multiple (or'd) or none depending on their needs.
> + *
> + * If DRM_WEDGE_RECOVERY_VENDOR method is used, vendors must provide additional
> + * documentation outlining further recovery steps.
The original documentation is sufficient so let's not duplicate specific
cases here.
Raag
> */
> #define DRM_WEDGE_RECOVERY_NONE BIT(0) /* optional telemetry collection */
> #define DRM_WEDGE_RECOVERY_REBIND BIT(1) /* unbind + bind driver */
> #define DRM_WEDGE_RECOVERY_BUS_RESET BIT(2) /* unbind + reset bus device + bind */
> +#define DRM_WEDGE_RECOVERY_VENDOR BIT(3) /* vendor specific recovery method */
>
> /**
> * struct drm_wedge_task_info - information about the guilty task of a wedge dev
> --
> 2.47.1
>
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