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Subject: Re: [PATCH] powerpc/pseries: Add shutdown() to vio_driver and vio_bus
To:     mpe@ellerman.id.au
Cc:     benh@kernel.crashing.org, linuxppc-dev@lists.ozlabs.org,
        linux-kernel@vger.kernel.org
References: <20210402001325.939668-1-tyreld@linux.ibm.com>
From:   Tyrel Datwyler <tyreld@linux.ibm.com>
Message-ID: <f326def4-0db0-f924-1700-dd7be3154153@linux.ibm.com>
Date:   Fri, 16 Apr 2021 11:46:50 -0700
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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@linux.ibm.com>
> ---

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

-Tyrel