linux-kernel - Re: [PATCH v7 0/5] Reset PCIe devices to address DMA problem on kdump with iommu

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Message-ID: <3404772.bJenOLl2bH@hammer82.arch.suse.de>
Date:	Tue, 29 Jan 2013 02:14:54 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	Takao Indoh <indou.takao@...fujitsu.com>
Cc:	yinghai@...nel.org, muneda.takahiro@...fujitsu.com,
	linux-pci@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, andi@...stfloor.org,
	tokunaga.keiich@...fujitsu.com, kexec@...ts.infradead.org,
	hbabu@...ibm.com, mingo@...hat.com, ddutile@...hat.com,
	vgoyal@...hat.com, ishii.hironobu@...fujitsu.com, hpa@...or.com,
	bhelgaas@...gle.com, tglx@...utronix.de, khalid@...ehiking.org
Subject: Re: [PATCH v7 0/5] Reset PCIe devices to address DMA problem on kdump with iommu

On Thursday, January 24, 2013 09:23:14 AM Takao Indoh wrote:
> (2013/01/23 9:47), Thomas Renninger wrote:
> > On Monday, January 21, 2013 10:11:04 AM Takao Indoh wrote:
> >> (2013/01/08 4:09), Thomas Renninger wrote:
> > ...
> > 
> >>> I tried the provided patches first on 2.6.32, then I verfied with
> >>> 3.8-rc2
> >>> and in both cases the disk is not detected anymore in
> >>> reset_devices (kexec'ed/kdump) case (but things work fine without these
> >>> patches).
> >> 
> >> So the problem that the disk is not detected was caused by exactmap
> >> problem you guys are discussing? Or still not detected even if exactmap
> >> problem is fixed?
> > 
> > This problem is related to the 5 PCI resetting patches.
> > Dumping worked with a 2.6.32 and a 3.8-rc2 kernel, adding the PCI
> > resetting
> > patches broke both. I first tried 2.6.32 and verified with 3.8-rc2 to make
> > sure I didn't mess up the backport adjustings of the patches to 2.6.32.
> If you have a chance please try again the patches with the latest
> firmware.
Not sure I can update the firmware as this is a reference platform used exactly
like this in production.

I also cannot see how this could help.

   Thomas
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