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Commit b39ba6ad authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
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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: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent a22131a2

arch/x86/kernel/amd_iommu.c

+25 −0
Original line number Original line Diff line number Diff line
@@ -1204,6 +1204,30 @@ static void free_coherent(struct device *dev, size_t size, 
	free_pages((unsigned long)virt_addr, get_order(size));

	free_pages((unsigned long)virt_addr, get_order(size));

}

}





/*

 * 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.

 * The function for pre-allocating protection domains.

 *

 *
@@ -1247,6 +1271,7 @@ static struct dma_mapping_ops amd_iommu_dma_ops = { 
	.unmap_single = unmap_single,

	.unmap_single = unmap_single,

	.map_sg = map_sg,

	.map_sg = map_sg,

	.unmap_sg = unmap_sg,

	.unmap_sg = unmap_sg,

	.dma_supported = amd_iommu_dma_supported,

};

};





/*

/*