From: Robert Hancock <hancockr@shaw.ca>
To: linux-kernel@vger.kernel.org
Cc: maciej.sosnowski@intel.com, dan.j.williams@intel.com
Subject: Re: DMA from memory to local bus
Date: Fri, 28 Nov 2008 21:24:40 -0600 [thread overview]
Message-ID: <4930B5F8.6020601@shaw.ca> (raw)
In-Reply-To: <62DDBB9E5E23CC4A929EE46F9427CEAF0162468D@BUDMLVEM04.e2k.ad.ge.com>
Hommel, Thomas (GE EntSol, Intelligent Platforms) wrote:
> Hi all,
> I'm currently developing a driver and want to make use of the DMA
> offload engine. Data has to be transferred from memory to a device on
> the local bus and vice versa.
> At a first look, the function dma_async_memcpy_buf_to_buf() seemed to be
> suitable, but it does not translate addresses correctly. Both addresses
> are treated as if they were in memory.
That would be the normal use of these things, I believe.. normally when
copying to/from a device the device does it itself with bus master DMA.
> In my configuration, the buffer is located in memory, but the device's
> I/O space is mapped into vmalloc space via ioremap(). How can I access
> the I/O space corectly from the DMA controller?
>
> Thanks for your help
> Thomas
next prev parent reply other threads:[~2008-11-29 3:25 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-28 6:35 DMA from memory to local bus Hommel, Thomas (GE EntSol, Intelligent Platforms)
2008-11-29 3:24 ` Robert Hancock [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-11-28 14:04 Hommel, Thomas (GE EntSol, Intelligent Platforms)
2008-12-01 17:04 ` Ira Snyder
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4930B5F8.6020601@shaw.ca \
--to=hancockr@shaw.ca \
--cc=dan.j.williams@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=maciej.sosnowski@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.