From: David Miller <davem@davemloft.net>
To: maheshk@cdac.in
Cc: linux-kernel@vger.kernel.org, kernelnewbies@nl.linux.org
Subject: Re: [HOWTO] accessing the DMA mapped data
Date: Thu, 10 May 2007 01:47:51 -0700 (PDT) [thread overview]
Message-ID: <20070510.014751.74749340.davem@davemloft.net> (raw)
In-Reply-To: <4642D095.6070305@cdac.in>
From: Mahesh <maheshk@cdac.in>
Date: Thu, 10 May 2007 13:28:13 +0530
> I have a small question regarding the accessing the data in the DMA
> mapped region (in the driver). In my driver I only have the
> 'dma_addr_t addr' variable which is result after the 'dma_map_single'.
> I don't have access to the virtual address of the data region.
>
> Is there helper routine which we will give me the virtual address back
> from the DMA mapped address???
You can eithe keep track of this yourself, or (depending upon
your usage) you might be able to use DMA pools, see
dma_pool_create() and friends.
next prev parent reply other threads:[~2007-05-10 8:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-10 7:58 [HOWTO] accessing the DMA mapped data Mahesh
2007-05-10 8:47 ` David Miller [this message]
2007-05-10 11:19 ` Mahesh
2007-05-10 11:32 ` David Miller
2007-05-10 11:41 ` Mahesh
2007-05-10 11:47 ` David Miller
2007-05-11 15:42 ` Muli Ben-Yehuda
2007-05-10 18:27 ` Roland Dreier
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=20070510.014751.74749340.davem@davemloft.net \
--to=davem@davemloft.net \
--cc=kernelnewbies@nl.linux.org \
--cc=linux-kernel@vger.kernel.org \
--cc=maheshk@cdac.in \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox