linux-kernel - Re: [HOWTO] accessing the DMA mapped data

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Message-Id: <20070510.014751.74749340.davem@davemloft.net>
Date:	Thu, 10 May 2007 01:47:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	maheshk@...c.in
Cc:	linux-kernel@...r.kernel.org, kernelnewbies@...linux.org
Subject: Re: [HOWTO] accessing the DMA mapped data

From: Mahesh <maheshk@...c.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.
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