From: David Woodhouse <dwmw2@infradead.org>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: "ksummit-discuss@lists.linuxfoundation.org"
<ksummit-discuss@lists.linuxfoundation.org>
Subject: Re: [Ksummit-discuss] [CORE TOPIC] Device error handling / reporting / isolation
Date: Tue, 13 May 2014 15:37:02 +0100 [thread overview]
Message-ID: <1399991822.879.206.camel@i7.infradead.org> (raw)
In-Reply-To: <1399666748.2166.68.camel@dabdike.int.hansenpartnership.com>
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On Fri, 2014-05-09 at 13:19 -0700, James Bottomley wrote:
> But for a laptop or desktop kernel, how far do we want to go? In
> theory, once the iommu is turned on, it corrals the device, since access
> to non programmed addresses (those without IOTLB entries) produces a
> fault. Is there anything extra we need to do beyond turning on the
> IOMMU?
Well, if it persists in misbehaving, we can try a function level reset.
Or perhaps power cycle it — we've gained the facility for power
management reasons, but we can probably use it for beating the device on
the head when it's naughty too. And some platforms can electrically
isolate misbehaving devices completely, rather than just ignoring their
DMA attempts.
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
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next prev parent reply other threads:[~2014-05-13 14:37 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-08 12:37 David Woodhouse
2014-05-08 18:03 ` Bjorn Helgaas
2014-05-08 20:00 ` Rafael J. Wysocki
2014-05-08 19:56 ` James Bottomley
2014-05-09 8:55 ` David Woodhouse
2014-05-09 11:31 ` Laurent Pinchart
2014-05-14 1:28 ` Benjamin Herrenschmidt
2014-05-09 17:48 ` Roland Dreier
2014-05-09 17:58 ` Matthew Wilcox
2014-05-09 18:08 ` Roland Dreier
2014-05-14 1:40 ` Benjamin Herrenschmidt
2014-05-09 18:05 ` Will Deacon
2014-05-12 15:03 ` Joerg Roedel
2014-05-09 19:37 ` Josh Triplett
2014-05-09 19:44 ` David Woodhouse
2014-05-09 19:53 ` Roland Dreier
2014-05-09 20:13 ` Luck, Tony
2014-05-09 20:19 ` James Bottomley
2014-05-10 1:09 ` Laurent Pinchart
2014-05-11 22:43 ` Daniel Vetter
2014-05-12 15:07 ` Joerg Roedel
2014-05-12 15:35 ` Daniel Vetter
2014-05-12 16:16 ` Andy Lutomirski
2014-05-12 16:28 ` Joerg Roedel
2014-05-12 16:59 ` Laurent Pinchart
2014-05-12 17:15 ` Joerg Roedel
2014-05-12 17:11 ` Daniel Vetter
2014-05-12 17:40 ` Joerg Roedel
2014-05-13 10:06 ` Daniel Vetter
2014-05-12 17:04 ` Daniel Vetter
2014-05-13 11:27 ` David Woodhouse
2014-05-13 17:25 ` Daniel Vetter
2014-05-14 1:50 ` Benjamin Herrenschmidt
2014-05-14 20:09 ` Daniel Vetter
2014-05-15 1:08 ` Benjamin Herrenschmidt
2014-05-12 16:26 ` Joerg Roedel
2014-05-12 14:58 ` Joerg Roedel
2014-05-13 14:37 ` David Woodhouse [this message]
2014-05-14 1:46 ` Benjamin Herrenschmidt
2014-05-14 1:43 ` Benjamin Herrenschmidt
2014-05-14 1:42 ` Benjamin Herrenschmidt
2014-05-14 1:24 ` Benjamin Herrenschmidt
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