From: Dan Williams <dan.j.williams@intel.com>
To: "Woodhouse, David" <david.woodhouse@intel.com>
Cc: Chris Li <lkml@chrisli.org>, linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: BUG in drivers/dma/ioat/dma_v2.c:314
Date: Wed, 30 Jun 2010 23:51:51 -0700 [thread overview]
Message-ID: <4C2C3B07.7050200@intel.com> (raw)
In-Reply-To: <1277965264.18854.16.camel@localhost>
On 6/30/2010 11:21 PM, Woodhouse, David wrote:
> On Wed, 2010-06-30 at 22:44 +0100, Williams, Dan J wrote:
>> I don't see a way around this beyond blacklisting this (platform, vt-d
>> setting, driver) combination. Is there a quirk infrastructure for this
>> sort of problem?
>
> Yeah, kind of. If the IOAT PCI device _always_ has its own IOMMU, we
> could have a quirk for it which says it must _never_ be matched by a
> catch-all IOMMU. That would probably solve it?
>
This version of the device only exists on the 5400 chipset and always
has its own iommu, but since other platforms get the DMAR entry right I
think this hammer is too big? Wouldn't this break VT-d operation on
non-busted platforms?
Alternatively I can just catch this failure earlier in the init process
and fail the driver load with a grumble printk about broken bios...
instead of the current BUG_ON() that is meant to catch runtime catastrophes.
--
Dan
next prev parent reply other threads:[~2010-07-01 6:51 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-28 23:50 Chris Li
2010-06-29 0:45 ` Dan Williams
2010-06-29 7:17 ` Chris Li
2010-06-29 23:20 ` Chris Li
2010-06-29 23:57 ` Dan Williams
2010-06-30 1:07 ` Chris Li
2010-06-30 4:17 ` Dan Williams
2010-06-30 18:26 ` Chris Li
2010-06-30 18:43 ` Chris Li
2010-06-30 18:43 ` David Woodhouse
2010-06-30 19:40 ` Dan Williams
2010-06-30 20:02 ` David Woodhouse
2010-06-30 21:44 ` Dan Williams
2010-06-30 21:59 ` Chris Li
2010-06-30 22:04 ` Dan Williams
2010-07-01 6:21 ` David Woodhouse
2010-07-01 6:51 ` Dan Williams [this message]
2010-07-01 7:12 ` David Woodhouse
2010-07-01 7:26 ` Dan Williams
2010-07-01 8:15 ` David Woodhouse
2010-07-01 17:20 ` Dan Williams
2010-07-01 17:58 ` Chris Li
2010-07-02 19:00 ` Chris Li
2010-07-05 10:16 ` David Woodhouse
2010-07-06 23:40 ` Chris Li
2010-07-07 0:51 ` Dan Williams
2010-07-07 0:51 ` Chris Li
2010-07-07 0:58 ` Dan Williams
2010-07-07 1:03 ` Chris Li
2010-07-07 3:22 ` David Woodhouse
2010-07-07 3:40 ` David Woodhouse
2010-07-07 17:47 ` Dan Williams
2010-07-07 18:07 ` David Woodhouse
2010-07-07 21:56 ` Chris Li
2010-07-09 21:28 ` Dan Williams
2010-07-09 22:00 ` Chris Li
2010-07-10 0:09 ` David Woodhouse
2010-07-15 5:41 ` Dan Williams
2010-07-16 21:29 ` Chris Li
2010-07-16 22:12 ` David Woodhouse
2010-07-16 22:40 ` Chris Li
2010-07-22 1:15 ` Dan Williams
2010-07-22 21:39 ` Chris Li
2010-07-22 22:00 ` Dan Williams
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