From: "David S. Miller" <davem@redhat.com>
To: dsaxena@plexity.net
Cc: lists@mdiehl.de, linux-kernel@vger.kernel.org
Subject: Re: [Patch] dma_sync_to_device
Date: Wed, 11 Feb 2004 09:51:23 -0800 [thread overview]
Message-ID: <20040211095123.2cf7399d.davem@redhat.com> (raw)
In-Reply-To: <20040211163901.GA24446@plexity.net>
On Wed, 11 Feb 2004 09:39:01 -0700
Deepak Saxena <dsaxena@plexity.net> wrote:
> If pci_dma_sync_single is for FROM_DEVICE only, than the direction
> parameter should go away from it and the from
> pci_dma_sync_to_device_single().
This is wrong. The direction parameter says what was done by the device/cpu
for the DMA, this is needed by the port to know how to perform the
pci_dma_sync_single et al. correctly.
For example, a port may have to do something different for FROM_DEVICE vs.
TO_DEVICE to properly execute the pci_dma_sync_single() request.
MIPS (and seemingly ARM) are probably the best platforms by which to draw up
the worst case scenerio for the implementation of these things :) and thus
the optimizations made possible by certain combinations of request+direction.
next prev parent reply other threads:[~2004-02-11 17:51 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-10 17:31 [Patch] dma_sync_to_device Martin Diehl
2004-02-10 18:42 ` David S. Miller
2004-02-10 18:59 ` Martin Diehl
2004-02-11 6:17 ` Deepak Saxena
2004-02-11 6:51 ` Martin Diehl
2004-02-11 16:39 ` Deepak Saxena
2004-02-11 17:51 ` David S. Miller [this message]
2004-02-11 18:18 ` Matt Porter
2004-02-11 18:30 ` David S. Miller
2004-02-11 18:57 ` Deepak Saxena
2004-02-11 19:08 ` David S. Miller
2004-02-12 3:46 ` Deepak Saxena
2004-02-12 3:58 ` David S. Miller
2004-02-13 1:49 ` Jamie Lokier
2004-02-14 7:24 ` David S. Miller
2004-02-11 19:23 ` Matt Porter
2004-02-11 19:30 ` David S. Miller
2004-02-11 18:43 ` linux-2.6.2 Kernel Problem Elikster
2004-02-14 11:51 ` Adrian Bunk
-- strict thread matches above, loose matches on Subject: below --
2004-02-13 14:27 [Patch] dma_sync_to_device James Bottomley
2004-02-14 8:51 ` Martin Diehl
2004-02-14 22:34 ` James Bottomley
2004-02-14 23:18 ` David S. Miller
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