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

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Message-ID: <20120914200334.GA9041@phenom.dumpdata.com>
Date:	Fri, 14 Sep 2012 16:03:36 -0400
From:	Konrad Rzeszutek Wilk <konrad@...nel.org>
To:	Takao Indoh <indou.takao@...fujitsu.com>
Cc:	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

> 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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