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

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Message-ID: <20110525184738.GA10283@us.ibm.com>
Date:	Wed, 25 May 2011 11:47:38 -0700
From:	Nishanth Aravamudan <nacc@...ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
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

Ben,

On 19.05.2011 [10:46:25 -0700], Nishanth Aravamudan wrote:
> On 19.05.2011 [17:43:56 +1000], Benjamin Herrenschmidt wrote:
> > 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.
> 
> Hrm, I think it's because for whatever reason [1] I forgot to cc you on 6/8?
> 
> https://lkml.org/lkml/2011/5/11/473

Were you able to find the patch I refer to above?

Thanks,
Nish

-- 
Nishanth Aravamudan <nacc@...ibm.com>
IBM Linux Technology Center
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