Re: [HOWTO] accessing the DMA mapped data

From: Mahesh <[email protected]>
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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