From: Joerg Roedel <joerg.roedel@amd.com>
To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: <shemminger@vyatta.com>, <davej@redhat.com>,
<tglx@linuxtronix.de>, <mingo@redhat.com>, <hpa@zytor.com>,
<linux-kernel@vger.kernel.org>, <x86@kernel.org>
Subject: Re: [Bug 487894] New: sky2 0000:06:00.0: DMA-API: device driver frees DMA memory with different size
Date: Thu, 2 Apr 2009 13:18:39 +0200 [thread overview]
Message-ID: <20090402111839.GE21083@amd.com> (raw)
In-Reply-To: <20090402200634I.fujita.tomonori@lab.ntt.co.jp>
On Thu, Apr 02, 2009 at 08:06:26PM +0900, FUJITA Tomonori wrote:
> On Thu, 2 Apr 2009 12:54:15 +0200
> Joerg Roedel <joerg.roedel@amd.com> wrote:
>
> > On Wed, Apr 01, 2009 at 11:02:45AM -0700, Stephen Hemminger wrote:
> > >
> > > The sky2 driver uses pci_unmap_len and pci_unmap_len_set which on 32 bit
> > > platforms are meaningless so they are stubbed out.
> > > Basically, DMA-API checks are wrong/bogus to enforce on 32bit x86 as is.
> >
> > As far as I know the VT-d driver is available on 32 bit x86 too. So this should
> > not always be a nop.
>
> VT-d is available on only x86_64.
At least there was a patch to enable it on 32 bit too. See
https://lists.linux-foundation.org/pipermail/iommu/2009-February/001080.html
It seems not to be upstream yet.
Joerg
--
| Advanced Micro Devices GmbH
Operating | Karl-Hammerschmidt-Str. 34, 85609 Dornach bei München
System |
Research | Geschäftsführer: Jochen Polster, Thomas M. McCoy, Giuliano Meroni
Center | Sitz: Dornach, Gemeinde Aschheim, Landkreis München
| Registergericht München, HRB Nr. 43632
next prev parent reply other threads:[~2009-04-02 11:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090401172708.GA11941@redhat.com>
2009-04-01 18:02 ` [Bug 487894] New: sky2 0000:06:00.0: DMA-API: device driver frees DMA memory with different size Stephen Hemminger
2009-04-02 10:54 ` Joerg Roedel
2009-04-02 11:06 ` FUJITA Tomonori
2009-04-02 11:18 ` Joerg Roedel [this message]
2009-04-02 14:03 ` FUJITA Tomonori
2009-04-02 14:31 ` Joerg Roedel
2009-04-02 15:08 ` Stephen Hemminger
2009-04-02 15:29 ` Joerg Roedel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20090402111839.GE21083@amd.com \
--to=joerg.roedel@amd.com \
--cc=davej@redhat.com \
--cc=fujita.tomonori@lab.ntt.co.jp \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=shemminger@vyatta.com \
--cc=tglx@linuxtronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox