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Commit 9c79f38b authored by Patrick Daly's avatar Patrick Daly
Browse files

iommu: dma-mapping-fast: Add support for get_sgtable 



The dma_get_sgtable() API is required to get the pages allocated via
dma_alloc_coherent() in the case where the device has an iommu, and
the allocated memory is not physically contiguous.

Change-Id: I47611032babe93662a4593605dbd646295910806
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent a4510649

drivers/iommu/dma-mapping-fast.c

+16 −0
Original line number Diff line number Diff line
@@ -611,6 +611,21 @@ static int fast_smmu_mmap_attrs(struct device *dev, struct vm_area_struct *vma, 
	return ret;

}



static int fast_smmu_get_sgtable(struct device *dev, struct sg_table *sgt,

				void *cpu_addr, dma_addr_t dma_addr,

				size_t size, unsigned long attrs)

{

	unsigned int n_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;

	struct vm_struct *area;



	area = find_vm_area(cpu_addr);

	if (!area || !area->pages)

		return -EINVAL;



	return sg_alloc_table_from_pages(sgt, area->pages, n_pages, 0, size,

					GFP_KERNEL);

}



static dma_addr_t fast_smmu_dma_map_resource(

			struct device *dev, phys_addr_t phys_addr,

			size_t size, enum dma_data_direction dir,
@@ -702,6 +717,7 @@ static const struct dma_map_ops fast_smmu_dma_ops = { 
	.alloc = fast_smmu_alloc,

	.free = fast_smmu_free,

	.mmap = fast_smmu_mmap_attrs,

	.get_sgtable = fast_smmu_get_sgtable,

	.map_page = fast_smmu_map_page,

	.unmap_page = fast_smmu_unmap_page,

	.sync_single_for_cpu = fast_smmu_sync_single_for_cpu,