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>
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index c0b2f4f..281cacb 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2252,6 +2252,17 @@
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 @@
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 @@
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) {