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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: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2016-07-08 11:47:22 +02:00
parent bb279475db
commit f37f7f33d5
1 changed files with 13 additions and 7 deletions
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20
drivers/iommu/amd_iommu.c
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@ -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) {