[PATCH] swiotlb: support syncing sub-ranges of mappings
This patch implements swiotlb_sync_single_range_for_{cpu,device}. This is intended to support an x86_64 implementation of dma_sync_single_range_for_{cpu,device}. Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
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@ -15,6 +15,14 @@ extern void swiotlb_sync_single_for_cpu(struct device *hwdev,
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extern void swiotlb_sync_single_for_device(struct device *hwdev,
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dma_addr_t dev_addr,
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size_t size, int dir);
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extern void swiotlb_sync_single_range_for_cpu(struct device *hwdev,
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dma_addr_t dev_addr,
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unsigned long offset,
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size_t size, int dir);
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extern void swiotlb_sync_single_range_for_device(struct device *hwdev,
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dma_addr_t dev_addr,
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unsigned long offset,
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size_t size, int dir);
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extern void swiotlb_sync_sg_for_cpu(struct device *hwdev,
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struct scatterlist *sg, int nelems,
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int dir);
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@ -622,6 +622,37 @@ swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
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swiotlb_sync_single(hwdev, dev_addr, size, dir);
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}
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/*
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* Same as above, but for a sub-range of the mapping.
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*/
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static inline void
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swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
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unsigned long offset, size_t size, int dir)
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{
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char *dma_addr = phys_to_virt(dev_addr) + offset;
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if (dir == DMA_NONE)
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BUG();
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if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
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sync_single(hwdev, dma_addr, size, dir);
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else if (dir == DMA_FROM_DEVICE)
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mark_clean(dma_addr, size);
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}
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void
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swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
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unsigned long offset, size_t size, int dir)
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{
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swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir);
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}
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void
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swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
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unsigned long offset, size_t size, int dir)
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{
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swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir);
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}
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/*
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* Map a set of buffers described by scatterlist in streaming mode for DMA.
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* This is the scatter-gather version of the above swiotlb_map_single
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@ -750,6 +781,8 @@ EXPORT_SYMBOL(swiotlb_map_sg);
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EXPORT_SYMBOL(swiotlb_unmap_sg);
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EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
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EXPORT_SYMBOL(swiotlb_sync_single_for_device);
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EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
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EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
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EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
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EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
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EXPORT_SYMBOL(swiotlb_dma_mapping_error);
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