linux-kernel - Re: [PATCH 5/8] powerpc: override dma_get_required

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Message-ID: <1305791036.7481.52.camel@pasglop>
Date:	Thu, 19 May 2011 17:43:56 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nishanth Aravamudan <nacc@...ibm.com>
Cc:	Milton Miller <miltonm@....com>, Paul Mackerras <paulus@...ba.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Anton Blanchard <anton@...ba.org>,
	Sonny Rao <sonnyrao@...ux.vnet.ibm.com>,
	Will Schmidt <will_schmidt@...t.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	cbe-oss-dev@...ts.ozlabs.org, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 5/8] powerpc: override dma_get_required_mask by
 platform hook and ops

On Wed, 2011-05-11 at 15:25 -0700, Nishanth Aravamudan wrote:
> From: Milton Miller <miltonm@....com>
> 
> The hook dma_get_required_mask is supposed to return the mask required
> by the platform to operate efficently.  The generic version of
> dma_get_required_mask in driver/base/platform.c returns a mask based
> only on max_pfn.  However, this is likely too big for iommu systems
> and could be too small for platforms that require a dma offset or have
> a secondary window at a high offset.

The result of those 3 patches doesn't build on top of my current tree,
the generic dma_ops lacks the dma_get_required_mask hook. I'll have a
look again after the merge window.

Cheers,
Ben.


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