Commit 9cc0c2af authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Joerg Roedel
Browse files

iommu/vt-d: Use dma_direct for bypass devices 



The intel-iommu driver currently has a partial reimplementation
of the direct mapping code for devices that use pass through
mode.  Replace that code with calls to the relevant dma_direct
routines at the highest level.  This means we have exactly the
same behvior as the dma direct code itself, and can prepare for
eventually only attaching the intel_iommu ops to devices that
actually need dynamic iommu mappings.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 48b2c937

drivers/iommu/intel-iommu.c

+31 −40
Original line number Diff line number Diff line
@@ -3657,9 +3657,6 @@ static dma_addr_t __intel_map_single(struct device *dev, phys_addr_t paddr, 


	BUG_ON(dir == DMA_NONE);



	if (!iommu_need_mapping(dev))

		return paddr;



	domain = get_valid_domain_for_dev(dev);

	if (!domain)

		return DMA_MAPPING_ERROR;
@@ -3708,15 +3705,20 @@ static dma_addr_t intel_map_page(struct device *dev, struct page *page, 
				 enum dma_data_direction dir,

				 unsigned long attrs)

{

	return __intel_map_single(dev, page_to_phys(page) + offset, size,

				  dir, *dev->dma_mask);

	if (iommu_need_mapping(dev))

		return __intel_map_single(dev, page_to_phys(page) + offset,

				size, dir, *dev->dma_mask);

	return dma_direct_map_page(dev, page, offset, size, dir, attrs);

}



static dma_addr_t intel_map_resource(struct device *dev, phys_addr_t phys_addr,

				     size_t size, enum dma_data_direction dir,

				     unsigned long attrs)

{

	return __intel_map_single(dev, phys_addr, size, dir, *dev->dma_mask);

	if (iommu_need_mapping(dev))

		return __intel_map_single(dev, phys_addr, size, dir,

				*dev->dma_mask);

	return dma_direct_map_resource(dev, phys_addr, size, dir, attrs);

}



static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
@@ -3728,9 +3730,6 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size) 
	struct intel_iommu *iommu;

	struct page *freelist;



	if (!iommu_need_mapping(dev))

		return;



	domain = find_domain(dev);

	BUG_ON(!domain);
@@ -3766,6 +3765,16 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr, 
			     size_t size, enum dma_data_direction dir,

			     unsigned long attrs)

{

	if (iommu_need_mapping(dev))

		intel_unmap(dev, dev_addr, size);

	else

		dma_direct_unmap_page(dev, dev_addr, size, dir, attrs);

}



static void intel_unmap_resource(struct device *dev, dma_addr_t dev_addr,

		size_t size, enum dma_data_direction dir, unsigned long attrs)

{

	if (iommu_need_mapping(dev))

		intel_unmap(dev, dev_addr, size);

}
@@ -3776,28 +3785,18 @@ static void *intel_alloc_coherent(struct device *dev, size_t size, 
	struct page *page = NULL;

	int order;



	if (!iommu_need_mapping(dev))

		return dma_direct_alloc(dev, size, dma_handle, flags, attrs);



	size = PAGE_ALIGN(size);

	order = get_order(size);



	if (iommu_need_mapping(dev))

	flags &= ~(GFP_DMA | GFP_DMA32);

	else if (dev->coherent_dma_mask < dma_get_required_mask(dev)) {

		if (dev->coherent_dma_mask < DMA_BIT_MASK(32))

			flags |= GFP_DMA;

		else

			flags |= GFP_DMA32;

	}



	if (gfpflags_allow_blocking(flags)) {

		unsigned int count = size >> PAGE_SHIFT;



		page = dma_alloc_from_contiguous(dev, count, order,

						 flags & __GFP_NOWARN);

		if (page && !iommu_need_mapping(dev) &&

		    page_to_phys(page) + size > dev->coherent_dma_mask) {

			dma_release_from_contiguous(dev, page, count);

			page = NULL;

		}

	}



	if (!page)
@@ -3823,6 +3822,9 @@ static void intel_free_coherent(struct device *dev, size_t size, void *vaddr, 
	int order;

	struct page *page = virt_to_page(vaddr);



	if (!iommu_need_mapping(dev))

		return dma_direct_free(dev, size, vaddr, dma_handle, attrs);



	size = PAGE_ALIGN(size);

	order = get_order(size);
@@ -3840,6 +3842,9 @@ static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist, 
	struct scatterlist *sg;

	int i;



	if (!iommu_need_mapping(dev))

		return dma_direct_unmap_sg(dev, sglist, nelems, dir, attrs);



	for_each_sg(sglist, sg, nelems, i) {

		nrpages += aligned_nrpages(sg_dma_address(sg), sg_dma_len(sg));

	}
@@ -3847,20 +3852,6 @@ static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist, 
	intel_unmap(dev, startaddr, nrpages << VTD_PAGE_SHIFT);

}



static int intel_nontranslate_map_sg(struct device *hddev,

	struct scatterlist *sglist, int nelems, int dir)

{

	int i;

	struct scatterlist *sg;



	for_each_sg(sglist, sg, nelems, i) {

		BUG_ON(!sg_page(sg));

		sg->dma_address = sg_phys(sg);

		sg->dma_length = sg->length;

	}

	return nelems;

}



static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nelems,

			enum dma_data_direction dir, unsigned long attrs)

{
@@ -3876,7 +3867,7 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele 


	BUG_ON(dir == DMA_NONE);

	if (!iommu_need_mapping(dev))

		return intel_nontranslate_map_sg(dev, sglist, nelems, dir);

		return dma_direct_map_sg(dev, sglist, nelems, dir, attrs);



	domain = get_valid_domain_for_dev(dev);

	if (!domain)
@@ -3926,7 +3917,7 @@ static const struct dma_map_ops intel_dma_ops = { 
	.map_page = intel_map_page,

	.unmap_page = intel_unmap_page,

	.map_resource = intel_map_resource,

	.unmap_resource = intel_unmap_page,

	.unmap_resource = intel_unmap_resource,

	.dma_supported = dma_direct_supported,

};

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