[PATCH] powerpc/pseries: Add shutdown() to vio_driver and vio_bus

[Tyrel Datwyler]

On 4/1/21 5:13 PM, Tyrel Datwyler wrote:
> 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 at linux.ibm.com>
> ---

Ping... any comments, problems with this approach?

-Tyrel