[RFC][PATCH] Reset PCIe devices to address DMA problem on kdump with iommu
indou.takao at jp.fujitsu.com
Mon Sep 24 07:12:02 EDT 2012
(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.
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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.
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