From: Andi Kleen <ak@suse.de>
To: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Ray Lee <ray-lk@madrabbit.org>, linux-kernel@vger.kernel.org
Subject: Re: Problem with DMA on x86_64 with 3 GB RAM
Date: 21 Nov 2006 11:30:00 +0100 [thread overview]
Message-ID: <p73psbhay8n.fsf@bingen.suse.de> (raw)
In-Reply-To: <455FF672.4070502@lwfinger.net>
Larry Finger <Larry.Finger@lwfinger.net> writes:
> I am trying to debug a bcm43xx DMA problem on an x86_64 system with 3
> GB RAM. Depending on the particular chip and its implementation, dma
> transfers may use 64-, 32-, or 30-bit addressing, with the problem
> interface using 30-bit addressing. From test prints, the correct mask
> (0x3FFFFFFF) is supplied to pci_set_dma_mask and
> pci_set_consistent_dma_mask. Neither call returns an error. In
> addition, several x86_64 systems with more than 1 GB RAM have worked
> with the current code.
30bit DMA has be bounced through GFP_DMA. The driver needs special
code for this. You can look at the b44 driver for a working reference.
The pci_dma_* interfaces on x86-64 only support masks >= 0xffffffff,
anything smaller has to be handled manually.
-Andi
next prev parent reply other threads:[~2006-11-21 10:30 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 [this message]
2006-11-21 16:37 ` Larry Finger
2006-11-21 16:46 ` Andi Kleen
2006-11-21 18:27 ` Alan
2006-11-21 18:31 ` Andi Kleen
2006-11-21 20:04 ` Alan
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