From: Andi Kleen <ak@suse.de>
To: Grant Grundler <grundler@parisc-linux.org>
Cc: Andi Kleen <ak@suse.de>, "David S. Miller" <davem@redhat.com>,
James.Bottomley@steeleye.com, axboe@suse.de, suparna@in.ibm.com,
linux-kernel@vger.kernel.org, alex_williamson@hp.com,
bjorn_helgaas@hp.com
Subject: Re: [RFC] block layer support for DMA IOMMU bypass mode II
Date: Wed, 2 Jul 2003 19:19:35 +0200 [thread overview]
Message-ID: <20030702171935.GA32261@wotan.suse.de> (raw)
In-Reply-To: <20030702165333.GB11739@dsl2.external.hp.com>
On Wed, Jul 02, 2003 at 10:53:33AM -0600, Grant Grundler wrote:
>
> > Maybe I'm missing something but from James description it sounds like the
> > block layer assumes that it can pass in a sglist with arbitary elements
> > and get it back remapped to continuous DMA addresses.
>
> In the x86-64 case, If the 1k elements are not physically contigous,
> I think most of them would get their own mapping.
Yes, but it won't be continguous in bus space.
>
> For x86-64, if an entry ends on a 4k alignment and the next one starts
> on a 4k alignment, could those be merged into one DMA segment that uses
> two adjacent mapping entries?
Yes, it is now in the version I wrote last night, but not in the
previous code that's in the tree.
-Andi
next prev parent reply other threads:[~2003-07-02 17:06 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-01 16:46 [RFC] block layer support for DMA IOMMU bypass mode James Bottomley
2003-07-01 17:09 ` Andi Kleen
2003-07-01 17:28 ` James Bottomley
2003-07-01 17:42 ` Andi Kleen
2003-07-01 19:22 ` Grant Grundler
2003-07-01 19:56 ` James Bottomley
2003-07-01 17:54 ` H. Peter Anvin
2003-07-01 19:19 ` Grant Grundler
2003-07-01 19:59 ` Alex Williamson
2003-07-01 20:11 ` James Bottomley
2003-07-01 20:03 ` James Bottomley
2003-07-01 23:01 ` Grant Grundler
2003-07-02 15:52 ` James Bottomley
2003-07-01 22:51 ` David S. Miller
2003-07-01 23:57 ` [RFC] block layer support for DMA IOMMU bypass mode II Andi Kleen
2003-07-02 0:03 ` David S. Miller
2003-07-02 0:22 ` Andi Kleen
2003-07-02 0:21 ` David S. Miller
2003-07-02 16:53 ` Grant Grundler
2003-07-02 17:19 ` Andi Kleen [this message]
2003-07-02 16:55 ` Grant Grundler
2003-07-02 17:20 ` Andi Kleen
2003-07-02 17:37 ` Grant Grundler
2003-07-02 21:16 ` Alan Cox
2003-07-02 23:56 ` Andi Kleen
2003-07-03 20:26 ` Alan Cox
2003-07-03 21:24 ` Andi Kleen
2003-07-03 22:19 ` Grant Grundler
2003-07-08 2:14 ` David S. Miller
2003-07-08 19:34 ` Andi Kleen
2003-07-08 19:47 ` Jeff Garzik
2003-07-08 20:10 ` Andi Kleen
2003-07-08 20:11 ` Grant Grundler
2003-07-08 22:04 ` David S. Miller
2003-07-08 22:25 ` Grant Grundler
2003-07-08 22:23 ` David S. Miller
2003-07-09 18:55 ` Andi Kleen
2003-07-23 11:40 ` Grant Grundler
2003-07-28 11:15 ` Andi Kleen
2003-07-28 14:59 ` Grant Grundler
2003-07-30 2:31 ` Grant Grundler
2003-08-01 21:51 ` Cliff White
2003-08-01 23:18 ` reaim now available as osdl-aim-7 - " Cliff White
2003-07-30 4:42 ` Grant Grundler
2003-07-30 4:51 ` David S. Miller
2003-07-30 13:06 ` Grant Grundler
2003-07-30 16:02 ` Grant Grundler
2003-07-30 16:36 ` Andi Kleen
2003-07-30 17:18 ` James Bottomley
2003-07-30 14:20 ` James Bottomley
2003-07-23 13:20 ` Grant Grundler
2003-07-23 15:30 ` Jens Axboe
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