[RFC][PATCH] Reset PCIe devices to address DMA problem on kdump with iommu

[Don Dutile]

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.