Commit ae4040d3 authored Apr 20, 2017 by Charan Teja Reddy

arm: dma-mapping: add iova size alignment check



On 32bit systems, bitmap storing the iova information is stored in per
page and each page represents the 128MB of IOVA. So, for the
alloc_iova() to return the requested range, iova size should be aligned
to 128MB.

Change-Id: I66eb15cdbb3d6730cc4d84cad9f0c652f91278d6
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>

parent 26db1949

arch/arm/mm/dma-mapping.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -2052,6 +2052,9 @@ arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size)
		if (!bitmap_size)
		return ERR_PTR(-EINVAL);

		WARN(!IS_ALIGNED(size, SZ_128M),
		"size is not aligned to 128M, alignment enforced");

		if (bitmap_size > PAGE_SIZE) {
		extensions = bitmap_size / PAGE_SIZE;
		bitmap_size = PAGE_SIZE;