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From: Michael Ellerman <>
To: Tyrel Datwyler <>
Subject: Re: [PATCH] powerpc/pseries: Add shutdown() to vio_driver and vio_bus
Date: Sat, 17 Apr 2021 22:30:14 +1000
Message-ID: <> (raw)
In-Reply-To: <>

Tyrel Datwyler <> writes:
> 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 <>
>> ---
> Ping... any comments, problems with this approach?

The kexec part seems like a bit of a hack.

It also doesn't help for kdump, when none of the shutdown code is run.

How many drivers do we have? Can we just implement a proper shutdown for


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Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-02  0:13 Tyrel Datwyler
2021-04-16 18:46 ` Tyrel Datwyler
2021-04-17 12:30   ` Michael Ellerman [this message]
2021-04-19 18:30     ` Tyrel Datwyler
2021-04-20  3:42       ` Michael Ellerman
2021-04-21 13:08 ` Michael Ellerman

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