From: Joerg Roedel <jroe...@suse.de>
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 <jroe...@suse.de>
---
drivers/iommu/amd_iommu.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 1bb003e..78b278b 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2260,6 +2260,17 @@ 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
@@ -2270,7 +2281,7 @@ 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;
@@ -2286,12 +2297,7 @@ 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) {
--
1.9.1
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