linux-kernel - Re: dma_pool_alloc restrict

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Message-ID: <20081113030334.GW15439@parisc-linux.org>
Date:	Wed, 12 Nov 2008 20:03:34 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Anil kumar <anils_r@...oo.com>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: dma_pool_alloc restrict < 4GB address

On Wed, Nov 12, 2008 at 02:14:24PM -0800, Anil kumar wrote:
> Is there anyway to restrict the returned bus address(dma address) from dma_poll_alloc to < 4GB ?
> The function returns a dma address(of type dma_addr_t). Is there anyway I can ensure to restrict it to < 4B address.
> I guess we can do that in pci_alloc_consistent as by default it returns 32bit address. 

dma_pool_alloc (as described in the documentation ...) allocates memory
using dma_alloc_coherent().  As long as you've set the coherent mask
to 32-bit (or left it alone, since it's 32-bit by default ...), you'll
get 32-bit dma addresses back.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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