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authorRobin Murphy <robin.murphy@arm.com>2016-11-14 15:16:26 +0300
committerJoerg Roedel <jroedel@suse.de>2016-11-14 18:58:36 +0300
commit51f8cc9e818a9e6df376db7aeb5822d43e58cfb3 (patch)
treee894f2534f0f8fc079d82cf410aba8d92d280e9c /drivers/iommu/dma-iommu.c
parentbc33b0ca11e3df467777a4fa7639ba488c9d4911 (diff)
downloadlinux-51f8cc9e818a9e6df376db7aeb5822d43e58cfb3.tar.xz
iommu/dma: Implement dma_{map,unmap}_resource()
With the new dma_{map,unmap}_resource() functions added to the DMA API for the benefit of cases like slave DMA, add suitable implementations to the arsenal of our generic layer. Since cache maintenance should not be a concern, these can both be standalone callback implementations without the need for arch code wrappers. CC: Joerg Roedel <joro@8bytes.org> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/dma-iommu.c')
-rw-r--r--drivers/iommu/dma-iommu.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index c5ab8667e6f2..2db0d641cf45 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -432,13 +432,12 @@ int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma)
return ret;
}
-dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, int prot)
+static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
+ size_t size, int prot)
{
dma_addr_t dma_addr;
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
struct iova_domain *iovad = cookie_iovad(domain);
- phys_addr_t phys = page_to_phys(page) + offset;
size_t iova_off = iova_offset(iovad, phys);
size_t len = iova_align(iovad, size + iova_off);
struct iova *iova = __alloc_iova(domain, len, dma_get_mask(dev));
@@ -454,6 +453,12 @@ dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
return dma_addr + iova_off;
}
+dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size, int prot)
+{
+ return __iommu_dma_map(dev, page_to_phys(page) + offset, size, prot);
+}
+
void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
enum dma_data_direction dir, unsigned long attrs)
{
@@ -624,6 +629,19 @@ void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
__iommu_dma_unmap(iommu_get_domain_for_dev(dev), sg_dma_address(sg));
}
+dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
+ size_t size, enum dma_data_direction dir, unsigned long attrs)
+{
+ return __iommu_dma_map(dev, phys, size,
+ dma_direction_to_prot(dir, false) | IOMMU_MMIO);
+}
+
+void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
+ size_t size, enum dma_data_direction dir, unsigned long attrs)
+{
+ __iommu_dma_unmap(iommu_get_domain_for_dev(dev), handle);
+}
+
int iommu_dma_supported(struct device *dev, u64 mask)
{
/*