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SubjectRe: [PATCH 9/9] x86/iommu: use dma_ops_list in get_dma_ops
On Fri, Sep 26, 2008 at 01:26:19PM +0530, Amit Shah wrote:
> * On Monday 22 Sep 2008 23:51:21 Joerg Roedel wrote:
> > This patch enables stackable dma_ops on x86. To do this, it also enables
> > the per-device dma_ops on i386.
> >
> > Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
> > ---
> > arch/x86/kernel/pci-dma.c | 26 ++++++++++++++++++++++++++
> > include/asm-x86/device.h | 6 +++---
> > include/asm-x86/dma-mapping.h | 14 +++++++-------
> > 3 files changed, 36 insertions(+), 10 deletions(-)
> >
> > diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
> > index b990fb6..2e517c2 100644
> > --- a/arch/x86/kernel/pci-dma.c
> > +++ b/arch/x86/kernel/pci-dma.c
> > @@ -82,6 +82,32 @@ void x86_register_dma_ops(struct dma_mapping_ops *ops,
> > write_unlock_irqrestore(&dma_ops_list_lock, flags);
> > }
> >
> > +struct dma_mapping_ops *find_dma_ops_for_device(struct device *dev)
> > +{
> > + int i;
> > + unsigned long flags;
> > + struct dma_mapping_ops *entry, *ops = NULL;
> > +
> > + read_lock_irqsave(&dma_ops_list_lock, flags);
> > +
> > + for (i = 0; i < DMA_OPS_TYPE_MAX; ++i)
> > + list_for_each_entry(entry, &dma_ops_list[i], list) {
> > + if (!entry->device_supported)
> > + continue;
> > + if (entry->device_supported(dev)) {
> > + ops = entry;
> > + goto out;
> > + }
> > + }
> > +out:
> > + read_unlock_irqrestore(&dma_ops_list_lock, flags);
>
> For PVDMA, we want the "native" dma_ops to succeed first, eg, nommu, and then
> do our "PV DMA", which is just translating gpa to hpa and then program the

Btw, how will dma_masks be handled when PV DMA just translates gpa to
hpa?

Joerg

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