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From: Vivek Goyal <vgoyal@redhat.com>
To: Takao Indoh <indou.takao@jp.fujitsu.com>
Cc: 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
Date: Tue, 11 Sep 2012 10:43:23 -0400	[thread overview]
Message-ID: <20120911144323.GF12039@redhat.com> (raw)
In-Reply-To: <504F1343.7030607@jp.fujitsu.com>

On Tue, Sep 11, 2012 at 07:32:35PM +0900, Takao Indoh wrote:

[..]
> I'll post new patch which clears bus master bit and resets devices in
> second kernel.
> 
> 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.

Can you explain a bit more how the error happens. I still don't think
that because of a bug in a platform somewhere we should be introducing
a separate command line parameter and not reuse the exisiting one. Also
you have not explained what's the bug and how a new parameter will 
avoid the bug.

Thanks
Vivek

  reply	other threads:[~2012-09-11 14:45 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-03 11:24 [RFC][PATCH] Reset PCIe devices to address DMA problem on kdump with iommu Takao Indoh
2012-08-03 11:46 ` Vivek Goyal
2012-08-06  4:30   ` Takao Indoh
2012-08-06 20:39     ` Vivek Goyal
2012-08-07  9:02       ` Takao Indoh
2012-09-05 11:09       ` Takao Indoh
2012-09-10  2:34         ` Kaneshige, Kenji
2012-09-10  6:35           ` Takao Indoh
2012-09-11 11:52             ` Kaneshige, Kenji
2012-09-10 14:36         ` Vivek Goyal
2012-09-11 10:32           ` Takao Indoh
2012-09-11 14:43             ` Vivek Goyal [this message]
2012-09-12  9:00               ` Takao Indoh
2012-09-14 15:48                 ` Vivek Goyal
2012-09-24 11:22                   ` Takao Indoh
2012-09-14 20:03             ` Konrad Rzeszutek Wilk
2012-09-19  1:52               ` Takao Indoh
2012-09-21 17:57               ` Don Dutile
2012-09-24 11:12                 ` Takao Indoh
2012-08-06  4:09 ` Don Dutile
2012-08-06  4:45   ` Takao Indoh

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