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

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Date:	Wed, 19 Sep 2012 10:52:43 +0900
From:	Takao Indoh <indou.takao@...fujitsu.com>
To:	konrad@...nel.org
CC:	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

(2012/09/15 5:03), 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.

That sounds good. I'll try it, thanks.

Thanks,
Takao Indoh

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