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

Takao Indoh 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.
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
>> the body of a message to majordomo at vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 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.

Takao Indoh

More information about the kexec mailing list