> On Tue, 12 Aug 2008 17:24:11 +0200
> Joerg Roedel <joerg.roedel@amd.com> wrote:
>
> > Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
> > ---
> > arch/x86/kernel/pci-gart_64.c | 21 +++++++++++++++++++++
> > 1 files changed, 21 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
> > index cdab678..55cc388 100644
> > --- a/arch/x86/kernel/pci-gart_64.c
> > +++ b/arch/x86/kernel/pci-gart_64.c
> > @@ -499,6 +499,26 @@ error:
> > return 0;
> > }
> >
> > +/* allocate and map a coherent mapping */
> > +static void *
> > +gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
> > + gfp_t flag)
> > +{
> > + void *vaddr;
> > +
> > + vaddr = (void *)__get_free_pages(flag, get_order(size));
> > + if (!vaddr)
> > + return NULL;
> > +
> > + *dma_addr = gart_map_single(dev, __pa(vaddr), size, DMA_BIDIRECTIONAL);
> > + if (*dma_addr != bad_dma_address)
> > + return vaddr;
> > +
> > + free_pages((unsigned long)vaddr, get_order(size));
> > +
> > + return NULL;
> > +}
> > +
> > static int no_agp;
>
> It would be better to return a size-aligned memory as DMA-mapping.txt
> says (though I don't think that it doesn't matter much):
>
>
http://lkml.org/lkml/2008/8/8/555
