introduce generic header file for the software IO/TLB

A series of patches introduce a generic header file for the software
IO/TLB implementation in lib/swiotlb.c.  Currently each architecture using
this code defines the prototypes itself.  The prototypes are moved to
include/linux/swiotlb.h and this file is included in architecture specific
code for X86 and IA64.

This patch:

Create include/linux/swiotlb.h file which contains all function prototypes
for the lib/swiotlb.c file.

(akpm: the dependent patches will be trickled through arch trees)
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/swiotlb.h

+#ifndef __LINUX_SWIOTLB_H
+#define __LINUX_SWIOTLB_H
+
+#include <linux/types.h>
+
+struct device;
+struct dma_attrs;
+struct scatterlist;
+
+extern void
+swiotlb_init(void);
+
+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_single(struct device *hwdev, void *ptr, size_t size, int dir);
+
+extern void
+swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
+		     size_t size, int dir);
+
+extern dma_addr_t
+swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size,
+			 int dir, struct dma_attrs *attrs);
+
+extern void
+swiotlb_unmap_single_attrs(struct device *hwdev, dma_addr_t dev_addr,
+			   size_t size, int dir, struct dma_attrs *attrs);
+
+extern int
+swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
+	       int direction);
+
+extern void
+swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
+		 int direction);
+
+extern int
+swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
+		     int dir, struct dma_attrs *attrs);
+
+extern void
+swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
+		       int nelems, int dir, struct dma_attrs *attrs);
+
+extern void
+swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+			    size_t size, int dir);
+
+extern void
+swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
+			int nelems, int dir);
+
+extern void
+swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
+			       size_t size, int dir);
+
+extern void
+swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
+			   int nelems, int dir);
+
+extern void
+swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
+				  unsigned long offset, size_t size, int dir);
+
+extern void
+swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
+				     unsigned long offset, size_t size,
+				     int 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);
+
+#endif /* __LINUX_SWIOTLB_H */