linux-kernel - Re: IO_PAGE_FAULTS with igb or igbvf on AMD IOMMU system

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Message-ID: <20120625112045.GS2624@amd.com>
Date:	Mon, 25 Jun 2012 13:20:45 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
CC:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	<e1000-devel@...ts.sourceforge.net>, <linux-kernel@...r.kernel.org>
Subject: Re: IO_PAGE_FAULTS with igb or igbvf on AMD IOMMU system

Hi,
On Wed, Jun 20, 2012 at 03:48:38PM -0700, Alexander Duyck wrote:
> On 06/20/2012 02:48 AM, Joerg Roedel wrote:

> If you are working on a recent kernel you should be able to overcome the
> BIOS issues.  I believe there are the options "pci=assign-busses" if the
> BIOS doesn't place enough buses on the bridge to support SR-IOV, and
> there is "pci=realloc" which will reassign the MMIO resources to make
> enough room for VF MMIO bars.

Thanks for all your help, it turned out to be a bug in the AMD IOMMU
driver. The pdev->dev didn't get the right dma_ops struct assigned so
that mapping requests actually never made it to the IOMMU driver. This
only happened with hotplugged and VFs of SR-IOV devices. Too bad, but I
sent a fix for that and it work now again. Thanks again for your help.

Regards,

	Joerg

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