From: Alan <alan@lxorguk.ukuu.org.uk>
To: Andi Kleen <ak@suse.de>
Cc: Larry Finger <Larry.Finger@lwfinger.net>,
Ray Lee <ray-lk@madrabbit.org>,
linux-kernel@vger.kernel.org
Subject: Re: Problem with DMA on x86_64 with 3 GB RAM
Date: Tue, 21 Nov 2006 18:27:26 +0000 [thread overview]
Message-ID: <20061121182726.7d31451f@localhost.localdomain> (raw)
In-Reply-To: <200611211746.39173.ak@suse.de>
On Tue, 21 Nov 2006 17:46:39 +0100
Andi Kleen <ak@suse.de> wrote:
>
> > Shouldn't this problem be mentioned somewhere in the documentation, or did I miss something?
The documentation is correct, the implementation is broken. The
documented behaviour works for all platforms except one whose maintainer
has a problem with it and refuses to follow the spec.
> Possibly, but devices that cannot address at least 4GB are normally
> categorized as "hardware bugs" (or less polite descriptions) and those don't
> tend to get much airtime in documentation.
The rest of the kernel deals with hardware limitations, 30bit DMA works
on the other platforms. This is an x86-64 platform problem. It
misimplements the basic pci_ functionality. If it doesn't wish to
implement the stuff (and there btw Andi I do think your view has
considerable merit) it should fail the set_mask requests.
Alan
next prev parent reply other threads:[~2006-11-21 18:22 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-15 19:01 bcm43xx regression 2.6.19rc3 -> rc5, rtnl_lock trouble? Ray Lee
2006-11-15 19:15 ` Michael Buesch
2006-11-15 19:41 ` Ray Lee
2006-11-16 2:51 ` Larry Finger
2006-11-16 5:51 ` Ray Lee
2006-11-18 11:24 ` Joseph Fannin
2006-11-18 16:55 ` Johannes Berg
2006-11-18 17:05 ` Larry Finger
2006-11-18 17:27 ` Ray Lee
2006-11-18 18:30 ` Adrian Bunk
2006-11-21 6:21 ` Ray Lee
2006-11-18 19:02 ` Larry Finger
2006-11-19 16:01 ` Michael Buesch
2006-12-12 4:06 ` ieee80211 sleeping in invalid context Ray Lee
2006-12-12 9:14 ` Michael Buesch
2006-12-12 17:51 ` Ray Lee
2006-12-12 18:31 ` Larry Finger
2006-11-19 6:15 ` Problem with DMA on x86_64 with 3 GB RAM Larry Finger
2006-11-21 4:38 ` Ray Lee
2006-11-21 11:28 ` Alan
2006-11-21 16:34 ` Larry Finger
2006-11-21 10:30 ` Andi Kleen
2006-11-21 16:37 ` Larry Finger
2006-11-21 16:46 ` Andi Kleen
2006-11-21 18:27 ` Alan [this message]
2006-11-21 18:31 ` Andi Kleen
2006-11-21 20:04 ` Alan
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