Date: Thu, 10 May 2007 01:47:51 -0700 (PDT)
Message-Id: <20070510.014751.74749340.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
From: David Miller <davem@davemloft.net>
In-Reply-To: <4642D095.6070305@cdac.in>
References: <4642D095.6070305@cdac.in>
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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.
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