linux-kernel - Re: BUG in drivers/dma/ioat/dma

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Message-ID: <1277928125.18854.0.camel@localhost>
Date:	Wed, 30 Jun 2010 21:02:05 +0100
From:	David Woodhouse <David.Woodhouse@...el.com>
To:	"Williams, Dan J" <dan.j.williams@...el.com>
Cc:	Chris Li <lkml@...isli.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: BUG in drivers/dma/ioat/dma_v2.c:314

On Wed, 2010-06-30 at 20:40 +0100, Williams, Dan J wrote:
>  From the dmesg:
> > IOMMU 0: reg_base_addr fe710000 ver 1:0 cap 900000c2f0462 ecap e01
> > DMAR: DRHD base: 0x000000fe714000 flags: 0x0
> > IOMMU 1: reg_base_addr fe714000 ver 1:0 cap 900000c2f0462 ecap e01
> > DMAR: DRHD base: 0x000000fe719000 flags: 0x0
> > IOMMU 2: reg_base_addr fe719000 ver 1:0 cap 900000c2f0462 ecap e01
> > DMAR: DRHD base: 0x000000fe718000 flags: 0x1
> > IOMMU 3: reg_base_addr fe718000 ver 1:0 cap 900000c2f0462 ecap e01
> 
> Where we expect bit 54 to be set for the DMA iommu, and it does not 
> appear to show up.

So the BIOS is lying to us about which PCI devices are attached to which
IOMMU?

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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