Re: [RFC][PATCH] Reset PCIe devices to address DMA problem on kdumpwith iommu

[Takao Indoh]

(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.

Thanks,
Takao Indoh

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