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Commit f37f7f33 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/amd: Introduce dir2prot() helper 



This function converts dma_data_direction to
iommu-protection flags. This will be needed on multiple
places in the code, so this will save some code.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent bb279475

drivers/iommu/amd_iommu.c

+13 −7
Original line number Diff line number Diff line
@@ -2252,6 +2252,17 @@ static void update_domain(struct protection_domain *domain) 
	domain->updated = false;

}



static int dir2prot(enum dma_data_direction direction)

{

	if (direction == DMA_TO_DEVICE)

		return IOMMU_PROT_IR;

	else if (direction == DMA_FROM_DEVICE)

		return IOMMU_PROT_IW;

	else if (direction == DMA_BIDIRECTIONAL)

		return IOMMU_PROT_IW | IOMMU_PROT_IR;

	else

		return 0;

}

/*

 * This function contains common code for mapping of a physically

 * contiguous memory region into DMA address space. It is used by all
@@ -2262,7 +2273,7 @@ static dma_addr_t __map_single(struct device *dev, 
			       struct dma_ops_domain *dma_dom,

			       phys_addr_t paddr,

			       size_t size,

			       int direction,

			       enum dma_data_direction direction,

			       u64 dma_mask)

{

	dma_addr_t offset = paddr & ~PAGE_MASK;
@@ -2278,12 +2289,7 @@ static dma_addr_t __map_single(struct device *dev, 
	if (address == DMA_ERROR_CODE)

		goto out;



	if (direction == DMA_TO_DEVICE)

		prot = IOMMU_PROT_IR;

	else if (direction == DMA_FROM_DEVICE)

		prot = IOMMU_PROT_IW;

	else if (direction == DMA_BIDIRECTIONAL)

		prot = IOMMU_PROT_IW | IOMMU_PROT_IR;

	prot = dir2prot(direction);



	start = address;

	for (i = 0; i < pages; ++i) {