linux-kernel - Re: mmaping a kernel buffer to user space

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Message-ID: <4549D722.5090007@ti.uni-mannheim.de>
Date:	Thu, 02 Nov 2006 12:31:46 +0100
From:	Guillermo Marcus <marcus@...uni-mannheim.de>
To:	rmk+lkml@....linux.org.uk
CC:	linux-kernel@...r.kernel.org
Subject: Re: mmaping a kernel buffer to user space

Russell King wrote:
> On Wed, Nov 01, 2006 at 01:58:17PM +0100, Guillermo Marcus Martinez wrote:
>> My suggestion would be to add two functions: pci_map_consistent() and
>> dma_map_coherent() to address this issue, and their corresponding
>> unmap's. That will make sure all that is needed is done, is a clean and
>> consistent with the pci_ and dma_ APIs, and fills a mmap requirement not
>> covered by the other functions.
> 
> You might want to look through include/asm-arm/dma-mapping.h to see if
> an architecture already has considered that and the interface they
> implemented.
> 

Nice! Thanks. I think the issue of mapping a coherent area to user space
is fairly general. Should not this be promoted to be part of the general
dma-api? (that is, not a platform specific function)
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