[RFC PATCH v2] Utilize the PCI API in the TTM framework.

Konrad Rzeszutek Wilk konrad.wilk at oracle.com
Mon Mar 21 16:18:35 PDT 2011

On Mon, Mar 21, 2011 at 02:11:07PM +0100, Michel Dänzer wrote:
> On Fre, 2011-01-07 at 12:11 -0500, Konrad Rzeszutek Wilk wrote: 
> > 
> > 1) The 'NULL' when doing dma_alloc_coherent is unsightly. I was toying
> > with modifying the TTM API to pass in 'struct device' or 'struct pci_device'
> > but figured it would make first sense to get your guys input before heading that route.
> It's worse than unsightly: It breaks TTM on PPC. See
> arch/powerpc/include/asm/dma-mapping.h: get_dma_ops() returns NULL if
> NULL is passed in for the device, and most of its callers BUG in that
> case. The exception being dma_supported(), so a possible solution might
> be to use that for checking if dma_alloc_coherent can be used.
> Dave, please prevent this change from entering mainline before there's a
> solution for this.

We do have a fix for it: 

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git devel/ttm.pci-api.v5

Can you tell me if that works for you?

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