linux-kernel - Re: [RFC][PATCH] Reset PCIe devices to address DMA problem on kdump with iommu

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Message-ID: <505CAAA1.3040409@redhat.com>
Date:	Fri, 21 Sep 2012 13:57:53 -0400
From:	Don Dutile <ddutile@...hat.com>
To:	Konrad Rzeszutek Wilk <konrad@...nel.org>
CC:	Takao Indoh <indou.takao@...fujitsu.com>, vgoyal@...hat.com,
	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, bhelgaas@...gle.com, hbabu@...ibm.com,
	ishii.hironobu@...fujitsu.com, martin.wilck@...fujitsu.com
Subject: Re: [RFC][PATCH] Reset PCIe devices to address DMA problem on kdump
 with iommu

On 09/14/2012 04:03 PM, Konrad Rzeszutek Wilk wrote:
>> As to the boot parameter to enable this function, you suggested using
>> reset_devices. I found that on a certain platform resetting devices
>> caused PCIe error due to a hardware bug. Therefore I think we need
>> new parameter apart from reset_devices to disable this function on
>> such a machine.
>
> Wouldn't a DMI quirk be better for this? That way the second kernel
> internally would know not to do this.
> --
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a DMI quirk for a PCIe switch?  pci-quirk maybe?  there is a hook
in per-device pci reset code path, which could be setup for such
a case.

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