From: Andi Kleen <ak@suse.de>
To: Jens Axboe <axboe@suse.de>
Cc: Michael Monnerie <m.monnerie@zmi.at>,
Jeff Garzik <jgarzik@pobox.com>,
linux-kernel@vger.kernel.org
Subject: Re: PCI-DMA: Out of IOMMU space on x86-64 (Athlon64x2), with solution
Date: Thu, 2 Mar 2006 15:35:35 +0100 [thread overview]
Message-ID: <200603021535.36549.ak@suse.de> (raw)
In-Reply-To: <20060302141412.GT4329@suse.de>
On Thursday 02 March 2006 15:14, Jens Axboe wrote:
[...]
Ok great we agree on everything then.
> > >
> > > I would not want to call wake_up() unless I have to. Would a
> > >
> > > smp_mb();
> > > if (waitqueue_active(&iommu_wq))
> > > ...
> > >
> > > not be sufficient?
> >
> > Probably, but one would need to be careful to not miss events this way.
>
> Definitely, as far as I can see the above should be enough...
Ok - you just need to give me a wait queue then and I would be happy
to add the wakeups to the low level code
(or you can just do it yourself if you prefer, shouldn't be very difficult ... - just
needs to be done for both swiotlb and GART iommu. The other architectures
can follow then. At the beginning using an ARCH_HAS_* ifdef might be a good
idea for easier transition for everybody)
-Andi
next prev parent reply other threads:[~2006-03-02 14:35 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-01 23:23 PCI-DMA: Out of IOMMU space on x86-64 (Athlon64x2), with solution Michael Monnerie
2006-03-02 1:03 ` Andi Kleen
2006-03-02 9:59 ` Jens Axboe
2006-03-03 8:16 ` Chris Wedgwood
2006-03-03 11:00 ` Andi Kleen
[not found] ` <200603021316.38077.ak@suse.de>
[not found] ` <4406E226.4050806@pobox.com>
2006-03-02 12:26 ` Andi Kleen
2006-03-02 12:31 ` Jens Axboe
2006-03-02 12:33 ` Jeff Garzik
[not found] ` <20060302123033.GL4329@suse.de>
2006-03-02 13:09 ` Andi Kleen
2006-03-02 13:10 ` Jens Axboe
2006-03-02 13:33 ` Andi Kleen
2006-03-02 13:33 ` Jens Axboe
2006-03-02 13:46 ` Andi Kleen
2006-03-02 13:49 ` Jens Axboe
2006-03-02 13:58 ` Andi Kleen
2006-03-02 14:14 ` Jens Axboe
2006-03-02 14:35 ` Andi Kleen [this message]
2006-03-02 14:38 ` Jens Axboe
-- strict thread matches above, loose matches on Subject: below --
2006-03-03 21:27 Allen Martin
2006-03-03 22:12 ` Andi Kleen
2006-03-03 22:23 ` Jeff Garzik
2006-03-03 22:32 ` Andi Kleen
2006-03-04 6:34 ` Michael Monnerie
[not found] <5Mq18-1Na-21@gated-at.bofh.it>
[not found] ` <5MqNc-2Y5-3@gated-at.bofh.it>
[not found] ` <5MqX4-39H-21@gated-at.bofh.it>
[not found] ` <5MyAS-5zh-5@gated-at.bofh.it>
2006-03-07 0:15 ` Robert Hancock
2006-04-02 7:51 ` Joerg Bashir
2006-04-02 8:00 ` Muli Ben-Yehuda
2006-04-02 8:24 ` Joerg Bashir
2006-04-02 11:16 ` Andi Kleen
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