| Date | Mon, 30 Jun 2008 00:07:16 +0900 | Subject | Re: [PATCH 26/34] AMD IOMMU: add mapping functions for scatter gather lists | From | FUJITA Tomonori <> |
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On Thu, 26 Jun 2008 21:28:02 +0200 Joerg Roedel <joerg.roedel@amd.com> wrote:
> This patch adds the dma_ops functions for mapping and unmapping scatter gather > lists. > > Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> > --- > arch/x86/kernel/amd_iommu.c | 98 +++++++++++++++++++++++++++++++++++++++++++ > 1 files changed, 98 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c > index b4079f6..f4747fe 100644 > --- a/arch/x86/kernel/amd_iommu.c > +++ b/arch/x86/kernel/amd_iommu.c > @@ -700,3 +700,101 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr, > spin_unlock_irqrestore(&domain->lock, flags); > } > > +static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist, > + int nelems, int dir) > +{ > + struct scatterlist *s; > + int i; > + > + for_each_sg(sglist, s, nelems, i) { > + s->dma_address = (dma_addr_t)sg_phys(s); > + s->dma_length = s->length; > + } > + > + return nelems; > +} > + > +static int map_sg(struct device *dev, struct scatterlist *sglist, > + int nelems, int dir) > +{ > + unsigned long flags; > + struct amd_iommu *iommu; > + struct protection_domain *domain; > + u16 devid; > + int i; > + struct scatterlist *s; > + phys_addr_t paddr; > + int mapped_elems = 0; > + > + get_device_resources(dev, &iommu, &domain, &devid); > + > + if (!iommu || !domain) > + return map_sg_no_iommu(dev, sglist, nelems, dir);
VT-d put a pointer in struct dev_archdata to store IOMMU info per device. Is is useful for you too?
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