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swiotlb: Support aligned swiotlb buffers
Add an argument to swiotlb_tbl_map_single that specifies the desired alignment of the allocated buffer. This is used by dma-iommu to ensure the buffer is aligned to the iova granule size when using swiotlb with untrusted sub-granule mappings. This addresses an issue where adjacent slots could be exposed to the untrusted device if IO_TLB_SIZE < iova granule < PAGE_SIZE. Signed-off-by: David Stevens <stevensd@chromium.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210929023300.335969-7-stevensd@google.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -818,8 +818,8 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
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size_t padding_size;
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aligned_size = iova_align(iovad, size);
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phys = swiotlb_tbl_map_single(dev, phys, size,
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aligned_size, dir, attrs);
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phys = swiotlb_tbl_map_single(dev, phys, size, aligned_size,
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iova_mask(iovad), dir, attrs);
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if (phys == DMA_MAPPING_ERROR)
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return DMA_MAPPING_ERROR;
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@ -380,7 +380,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
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*/
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trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
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map = swiotlb_tbl_map_single(dev, phys, size, size, dir, attrs);
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map = swiotlb_tbl_map_single(dev, phys, size, size, 0, dir, attrs);
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if (map == (phys_addr_t)DMA_MAPPING_ERROR)
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return DMA_MAPPING_ERROR;
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@ -45,7 +45,8 @@ extern void __init swiotlb_update_mem_attributes(void);
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phys_addr_t swiotlb_tbl_map_single(struct device *hwdev, phys_addr_t phys,
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size_t mapping_size, size_t alloc_size,
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enum dma_data_direction dir, unsigned long attrs);
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unsigned int alloc_aligned_mask, enum dma_data_direction dir,
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unsigned long attrs);
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extern void swiotlb_tbl_unmap_single(struct device *hwdev,
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phys_addr_t tlb_addr,
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@ -459,7 +459,7 @@ static unsigned int wrap_index(struct io_tlb_mem *mem, unsigned int index)
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* allocate a buffer from that IO TLB pool.
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*/
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static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
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size_t alloc_size)
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size_t alloc_size, unsigned int alloc_align_mask)
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{
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struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
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unsigned long boundary_mask = dma_get_seg_boundary(dev);
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@ -483,6 +483,7 @@ static int swiotlb_find_slots(struct device *dev, phys_addr_t orig_addr,
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stride = (iotlb_align_mask >> IO_TLB_SHIFT) + 1;
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if (alloc_size >= PAGE_SIZE)
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stride = max(stride, stride << (PAGE_SHIFT - IO_TLB_SHIFT));
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stride = max(stride, (alloc_align_mask >> IO_TLB_SHIFT) + 1);
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spin_lock_irqsave(&mem->lock, flags);
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if (unlikely(nslots > mem->nslabs - mem->used))
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@ -541,7 +542,8 @@ found:
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phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
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size_t mapping_size, size_t alloc_size,
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enum dma_data_direction dir, unsigned long attrs)
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unsigned int alloc_align_mask, enum dma_data_direction dir,
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unsigned long attrs)
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{
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struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
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unsigned int offset = swiotlb_align_offset(dev, orig_addr);
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@ -561,7 +563,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr,
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return (phys_addr_t)DMA_MAPPING_ERROR;
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}
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index = swiotlb_find_slots(dev, orig_addr, alloc_size + offset);
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index = swiotlb_find_slots(dev, orig_addr,
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alloc_size + offset, alloc_align_mask);
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if (index == -1) {
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if (!(attrs & DMA_ATTR_NO_WARN))
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dev_warn_ratelimited(dev,
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@ -675,7 +678,7 @@ dma_addr_t swiotlb_map(struct device *dev, phys_addr_t paddr, size_t size,
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trace_swiotlb_bounced(dev, phys_to_dma(dev, paddr), size,
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swiotlb_force);
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swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, size, dir,
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swiotlb_addr = swiotlb_tbl_map_single(dev, paddr, size, size, 0, dir,
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attrs);
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if (swiotlb_addr == (phys_addr_t)DMA_MAPPING_ERROR)
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return DMA_MAPPING_ERROR;
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@ -759,7 +762,7 @@ struct page *swiotlb_alloc(struct device *dev, size_t size)
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if (!mem)
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return NULL;
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index = swiotlb_find_slots(dev, 0, size);
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index = swiotlb_find_slots(dev, 0, size, 0);
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if (index == -1)
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return NULL;
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