Message-ID: <5059256B.2010708@jp.fujitsu.com>
Date: Wed, 19 Sep 2012 10:52:43 +0900
From: Takao Indoh <indou.takao@jp.fujitsu.com>
MIME-Version: 1.0
To: konrad@kernel.org
CC: vgoyal@redhat.com, kexec@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	bhelgaas@google.com, hbabu@us.ibm.com,
	ishii.hironobu@jp.fujitsu.com, martin.wilck@ts.fujitsu.com
Subject: Re: [RFC][PATCH] Reset PCIe devices to address DMA problem on kdump
 with iommu
References: <501BB4EF.7080909@jp.fujitsu.com> <20120803114643.GA28330@redhat.com> <501F4877.5050605@jp.fujitsu.com> <20120806203902.GH25559@redhat.com> <50473306.1070803@jp.fujitsu.com> <20120910143604.GB639@redhat.com> <504F1343.7030607@jp.fujitsu.com> <20120914200334.GA9041@phenom.dumpdata.com>
In-Reply-To: <20120914200334.GA9041@phenom.dumpdata.com>
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Sender: linux-pci-owner@vger.kernel.org

(2012/09/15 5:03), 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.

That sounds good. I'll try it, thanks.

Thanks,
Takao Indoh