[PATCH v6 2/5] drm: Add DRM_WEDGE_RECOVERY_COLD_RESET recovery method

[Mallesh Koujalagi <mallesh.koujalagi@intel.com>]

Introduce DRM_WEDGE_RECOVERY_COLD_RESET (BIT(4)) recovery method to handle
scenarios requiring device power cycle.

This method addresses cases where other recovery mechanisms
(driver reload, PCIe reset, etc.) are insufficient to restore device
functionality. When set, it indicates to userspace that only device power
cycle can recover the device from its current error state.

Signed-off-by: Mallesh Koujalagi <mallesh.koujalagi@intel.com>
Reviewed-by: Raag Jadav <raag.jadav@intel.com>
---
v3:
- Update any scenario that requires cold-reset. (Riana)

v4:
- Rename cold reset to power cyclce. (Raag)

v5:
- Make it consistent with consumer expectations. (Raag)

v6:
- Drop "last resort" wording. (Riana)
---
 drivers/gpu/drm/drm_drv.c | 2 ++
 include/drm/drm_device.h  | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 675675480da4..19c25366635e 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 "bus-reset";
 	case DRM_WEDGE_RECOVERY_VENDOR:
 		return "vendor-specific";
+	case DRM_WEDGE_RECOVERY_COLD_RESET:
+		return "cold-reset";
 	default:
 		return NULL;
 	}
diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h
index 768a8dae83c5..75f030d027ee 100644
--- a/include/drm/drm_device.h
+++ b/include/drm/drm_device.h
@@ -37,6 +37,7 @@ struct pci_controller;
 #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 */
+#define DRM_WEDGE_RECOVERY_COLD_RESET	BIT(4)	/* remove device + slot power cycle + rescan */
 
 /**
  * struct drm_wedge_task_info - information about the guilty task of a wedge dev
-- 
2.34.1