From: Jens Axboe <axboe@suse.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Matthew Wilcox <matthew@wil.cx>,
James Bottomley <James.Bottomley@SteelEye.com>,
SCSI Mailing List <linux-scsi@vger.kernel.org>,
g.liakhovetski@gmx.de
Subject: Re: [PATCH] dc395x: Fix support for highmem
Date: Wed, 16 Mar 2005 18:04:17 +0100 [thread overview]
Message-ID: <20050316170417.GY7842@suse.de> (raw)
In-Reply-To: <20050316170259.GA25056@infradead.org>
On Wed, Mar 16 2005, Christoph Hellwig wrote:
> On Wed, Mar 16, 2005 at 05:53:39PM +0100, Jens Axboe wrote:
> > The list doesn't really need dma mapping at that point, the problem here
> > is that the driver needs to punt to pio mode because of foo. So calling
> > pci/dma_map_* is pointless, since the CPU will have to do the transfer
> > anyways. What the driver is really looking for at this point, is a way
> > to map the pages in the sglist to a virtual address.
>
> Given that there's quite a few cases of this "problem" it would be nice
> to have common helpers for it. Especially as it's really difficult when
> we allow merging of sg list entries
I thought about that when writing the above, but is there really more
than one case for SCSI drivers? If there is, sure lets add the helpers.
But I would consider it a quite rare occurence, I've never seen it
before.
--
Jens Axboe
next prev parent reply other threads:[~2005-03-16 17:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200503160209.j2G29cAf010870@hera.kernel.org>
2005-03-16 7:58 ` [PATCH] dc395x: Fix support for highmem Jens Axboe
2005-03-16 15:13 ` James Bottomley
2005-03-16 16:04 ` Jens Axboe
2005-03-16 16:48 ` Matthew Wilcox
2005-03-16 16:53 ` Jens Axboe
2005-03-16 17:02 ` Christoph Hellwig
2005-03-16 17:04 ` Jens Axboe [this message]
2005-03-16 18:44 ` Mike Christie
2005-03-16 18:53 ` iSCSI and scatterlists Matthew Wilcox
2005-03-16 19:59 ` Dmitry Yusupov
2005-03-16 18:53 ` [PATCH] dc395x: Fix support for highmem Jens Axboe
2005-03-20 9:14 ` Christoph Hellwig
2005-03-20 20:51 ` Guennadi Liakhovetski
2005-03-21 7:55 ` Jens Axboe
[not found] ` <7044.1111398919@www16.gmx.net>
2005-03-21 10:38 ` gl
2005-03-21 10:44 ` Jens Axboe
2005-03-21 11:00 ` gl
2005-03-30 21:22 ` Guennadi Liakhovetski
2005-03-30 22:13 ` James Bottomley
2005-03-31 8:58 ` gl
2005-04-09 22:48 ` Guennadi Liakhovetski
2005-04-21 21:49 ` Guennadi Liakhovetski
2005-04-22 11:36 ` Jens Axboe
2005-04-23 9:35 ` Guennadi Liakhovetski
2005-04-23 10:06 ` Guennadi Liakhovetski
2005-04-23 19:01 ` James Bottomley
2005-04-24 0:22 ` Guennadi Liakhovetski
2005-04-24 14:31 ` Guennadi Liakhovetski
2005-04-24 22:11 ` James Bottomley
2005-04-25 19:56 ` Guennadi Liakhovetski
2005-03-16 20:24 ` Guennadi Liakhovetski
2005-03-17 7:40 ` Jens Axboe
[not found] ` <22734.1111050528@www13.gmx.net>
2005-03-17 9:41 ` gl
2005-03-17 10:08 ` Jens Axboe
2005-03-17 10:56 ` gl
2005-03-17 20:51 ` Guennadi Liakhovetski
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