linux-kernel - Re: [PATCH 0/5 v2] Fix NVMe driver support on Power with 32-bit DMA

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Message-ID: <1443819066.27295.19.camel@kernel.crashing.org>
Date:	Sat, 03 Oct 2015 06:51:06 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	Matthew Wilcox <willy@...ux.intel.com>
Cc:	Keith Busch <keith.busch@...el.com>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	David Gibson <david@...son.dropbear.id.au>,
	Christoph Hellwig <hch@...radead.org>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 0/5 v2] Fix NVMe driver support on Power with 32-bit DMA

On Fri, 2015-10-02 at 13:09 -0700, Nishanth Aravamudan wrote:

> 1) add a generic dma_get_page_shift implementation that just returns
> PAGE_SHIFT

So you chose to return the granularity of the iommu to the driver
rather than providing a way for the driver to request a specific
alignment for DMA mappings. Any specific reason ?

Cheers,
Ben.

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