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

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Message-ID: <50604002.8050500@jp.fujitsu.com>
Date:	Mon, 24 Sep 2012 20:12:02 +0900
From:	Takao Indoh <indou.takao@...fujitsu.com>
To:	ddutile@...hat.com
CC:	konrad@...nel.org, 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

(2012/09/22 2:57), Don Dutile wrote:
> 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.
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
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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.

Yep, I think early-quirk is better.

Thanks,
Takao Indoh

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