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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

  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
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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