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

Christoph Hellwig hch at infradead.org
Sat Oct 3 01:19:52 PDT 2015

On Sat, Oct 03, 2015 at 06:51:06AM +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2015-10-02 at 13:09 -0700, Nishanth Aravamudan wrote:
> > 1) add a generic dma_get_page_shift implementation that just returns
> 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 ?

At least for NVMe that's the way to go - it allows to set a page set in
the device which should fit the IOMMU page size.

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