1 files changed, 121 insertions, 0 deletions
diff --git a/kernel/include/linux/swiotlb.h b/kernel/include/linux/swiotlb.h
new file mode 100644
index 000000000..e7a018eaf
--- /dev/null
+++ b/kernel/include/linux/swiotlb.h
@@ -0,0 +1,121 @@
+#ifndef __LINUX_SWIOTLB_H
+#define __LINUX_SWIOTLB_H
+
+#include <linux/types.h>
+
+struct device;
+struct dma_attrs;
+struct scatterlist;
+
+extern int swiotlb_force;
+
+/*
+ * Maximum allowable number of contiguous slabs to map,
+ * must be a power of 2.  What is the appropriate value ?
+ * The complexity of {map,unmap}_single is linearly dependent on this value.
+ */
+#define IO_TLB_SEGSIZE	128
+
+/*
+ * log of the size of each IO TLB slab.  The number of slabs is command line
+ * controllable.
+ */
+#define IO_TLB_SHIFT 11
+
+extern void swiotlb_init(int verbose);
+int swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
+extern unsigned long swiotlb_nr_tbl(void);
+unsigned long swiotlb_size_or_default(void);
+extern int swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs);
+
+/*
+ * Enumeration for sync targets
+ */
+enum dma_sync_target {
+	SYNC_FOR_CPU = 0,
+	SYNC_FOR_DEVICE = 1,
+};
+
+/* define the last possible byte of physical address space as a mapping error */
+#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0)
+
+extern phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
+					  dma_addr_t tbl_dma_addr,
+					  phys_addr_t phys, size_t size,
+					  enum dma_data_direction dir);
+
+extern void swiotlb_tbl_unmap_single(struct device *hwdev,
+				     phys_addr_t tlb_addr,
+				     size_t size, enum dma_data_direction dir);
+
+extern void swiotlb_tbl_sync_single(struct device *hwdev,
+				    phys_addr_t tlb_addr,
+				    size_t size, enum dma_data_direction dir,
+				    enum dma_sync_target target);
+
+/* Accessory functions. */
+extern void
+*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
+			dma_addr_t *dma_handle, gfp_t flags);
+
+extern void
+swiotlb_free_coherent(struct device *hwdev, size_t size,
+		      void *vaddr, dma_addr_t dma_handle);
+
+extern dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
+				   unsigned long offset, size_t size,
+				   enum dma_data_direction dir,
+				   struct dma_attrs *attrs);
+extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
+			       size_t size, enum dma_data_direction dir,
+			       struct dma_attrs *attrs);
+
+extern int
+swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
+	       enum dma_data_direction dir);
+
+extern void
+swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
+		 enum dma_data_direction dir);
+
+extern int
+swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
+		     enum dma_data_direction dir, struct dma_attrs *attrs);
+
+extern void
+swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
+		       int nelems, enum dma_data_direction dir,
+		       struct dma_attrs *attrs);
+
+extern void
+swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+			    size_t size, enum dma_data_direction dir);
+
+extern void
+swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
+			int nelems, enum dma_data_direction dir);
+
+extern void
+swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
+			       size_t size, enum dma_data_direction dir);
+
+extern void
+swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
+			   int nelems, enum dma_data_direction dir);
+
+extern int
+swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
+
+extern int
+swiotlb_dma_supported(struct device *hwdev, u64 mask);
+
+#ifdef CONFIG_SWIOTLB
+extern void __init swiotlb_free(void);
+#else
+static inline void swiotlb_free(void) { }
+#endif
+
+extern void swiotlb_print_info(void);
+extern int is_swiotlb_buffer(phys_addr_t paddr);
+
+#endif /* __LINUX_SWIOTLB_H */