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| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-09-09 18:40:46 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-09-19 12:59:20 +0200 |
| commit | b39ba6ad004a31bf2a08ba2b08c1e0f9b3530bb7 (patch) | |
| tree | 1d9415db8d47a984692b17d02a3afb365352caa4 /arch/x86/kernel/amd_iommu.c | |
| parent | a22131a223147016041b5e5cd0ae5ab61ef4177e (diff) | |
| download | lwn-b39ba6ad004a31bf2a08ba2b08c1e0f9b3530bb7.tar.gz lwn-b39ba6ad004a31bf2a08ba2b08c1e0f9b3530bb7.zip | |
AMD IOMMU: add dma_supported callback
This function determines if the AMD IOMMU implementation is responsible
for a given device. So the DMA layer can get this information from the
driver.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 0cb8fd2359f5..a6a6f8ed1cf5 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -1205,6 +1205,30 @@ free_mem: } /* + * This function is called by the DMA layer to find out if we can handle a + * particular device. It is part of the dma_ops. + */ +static int amd_iommu_dma_supported(struct device *dev, u64 mask) +{ + u16 bdf; + struct pci_dev *pcidev; + + /* No device or no PCI device */ + if (!dev || dev->bus != &pci_bus_type) + return 0; + + pcidev = to_pci_dev(dev); + + bdf = calc_devid(pcidev->bus->number, pcidev->devfn); + + /* Out of our scope? */ + if (bdf > amd_iommu_last_bdf) + return 0; + + return 1; +} + +/* * The function for pre-allocating protection domains. * * If the driver core informs the DMA layer if a driver grabs a device @@ -1247,6 +1271,7 @@ static struct dma_mapping_ops amd_iommu_dma_ops = { .unmap_single = unmap_single, .map_sg = map_sg, .unmap_sg = unmap_sg, + .dma_supported = amd_iommu_dma_supported, }; /* |