Currently, neither the vio_bus or vio_driver structures provide support
for a shutdown() routine.
Add support for shutdown() by allowing drivers to provide a
implementation via function pointer in their vio_driver struct and
provide a proper implementation in the driver template for the vio_bus
that calls a vio drivers shutdown() if defined.
In the case that no shutdown() is defined by a vio driver and a kexec is
in progress we implement a big hammer that calls remove() to ensure no
further DMA for the devices is possible.
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210402001325.939668-1-tyreld@linux.ibm.com
const struct vio_device_id *id_table;
int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
void (*remove)(struct vio_dev *dev);
+ void (*shutdown)(struct vio_dev *dev);
/* A driver must have a get_desired_dma() function to
* be loaded in a CMO environment if it uses DMA.
*/
#include <linux/mm.h>
#include <linux/dma-map-ops.h>
#include <linux/kobject.h>
+#include <linux/kexec.h>
#include <asm/iommu.h>
#include <asm/dma.h>
return 0;
}
+static void vio_bus_shutdown(struct device *dev)
+{
+ struct vio_dev *viodev = to_vio_dev(dev);
+ struct vio_driver *viodrv;
+
+ if (dev->driver) {
+ viodrv = to_vio_driver(dev->driver);
+ if (viodrv->shutdown)
+ viodrv->shutdown(viodev);
+ else if (kexec_in_progress)
+ vio_bus_remove(dev);
+ }
+}
+
/**
* vio_register_driver: - Register a new vio driver
* @viodrv: The vio_driver structure to be registered.
.match = vio_bus_match,
.probe = vio_bus_probe,
.remove = vio_bus_remove,
+ .shutdown = vio_bus_shutdown,
};
/**