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iommu/dma-iommu: Allow dma_info_to_prot to be used globally

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The dma_info_to_prot() function is needed for drivers that
implement their own DMA operation so that the DMA directions
and attributes can be translated to IOMMU page flags, so
make it a global function.

Change-Id: I4d74f193f75801e2d481f3a2ec4044f2da2ae8aa
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Isaac J. Manjarres 2019-08-02 16:53:49 -07:00 • committed by Gerrit - the friendly Code Review server
commit 4f869790bd
2 changed files with 3 additions and 1 deletions
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2
drivers/iommu/dma-iommu.c
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@ -362,7 +362,7 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
*
* Return: corresponding IOMMU API page protection flags
*/
static int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
unsigned long attrs)
{
int prot = coherent ? IOMMU_CACHE : 0;

2
include/linux/dma-iommu.h
View file

@ -20,6 +20,8 @@ int iommu_get_dma_cookie(struct iommu_domain *domain);
int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
void iommu_put_dma_cookie(struct iommu_domain *domain);
int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
unsigned long attrs);
size_t iommu_dma_prepare_map_sg(struct device *dev, struct iova_domain *iovad,
struct scatterlist *sg, int nents);
int iommu_dma_finalise_sg(struct device *dev, struct scatterlist *sg,