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authorMarek Szyprowski <m.szyprowski@samsung.com>2020-05-13 15:32:10 +0200
committerChristoph Hellwig <hch@lst.de>2020-05-13 15:48:20 +0200
commit48530d9fab0d3bf08827f9167be54acf66d4d457 (patch)
treee33ceb3a5ed8858d292e8856ea2029a13b04e7b3 /include/linux/iommu.h
parent709d6d73c756107fb8a292a9f957d630097425fa (diff)
iommu: add generic helper for mapping sgtable objects
struct sg_table is a common structure used for describing a memory buffer. It consists of a scatterlist with memory pages and DMA addresses (sgl entry), as well as the number of scatterlist entries: CPU pages (orig_nents entry) and DMA mapped pages (nents entry). It turned out that it was a common mistake to misuse nents and orig_nents entries, calling mapping functions with a wrong number of entries. To avoid such issues, lets introduce a common wrapper operating directly on the struct sg_table objects, which take care of the proper use of the nents and orig_nents entries. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Joerg Roedel <jroedel@suse.de> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/iommu.h')
-rw-r--r--include/linux/iommu.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7ef8b0bda695..b1bfbe6dff42 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -466,6 +466,22 @@ extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t io
extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler, void *token);
+/**
+ * iommu_map_sgtable - Map the given buffer to the IOMMU domain
+ * @domain: The IOMMU domain to perform the mapping
+ * @iova: The start address to map the buffer
+ * @sgt: The sg_table object describing the buffer
+ * @prot: IOMMU protection bits
+ *
+ * Creates a mapping at @iova for the buffer described by a scatterlist
+ * stored in the given sg_table object in the provided IOMMU domain.
+ */
+static inline size_t iommu_map_sgtable(struct iommu_domain *domain,
+ unsigned long iova, struct sg_table *sgt, int prot)
+{
+ return iommu_map_sg(domain, iova, sgt->sgl, sgt->orig_nents, prot);
+}
+
extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
extern void generic_iommu_put_resv_regions(struct device *dev,