1 files changed, 94 insertions, 343 deletions

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index c7ca45f97dd..150866b2a3f 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -14,10 +14,24 @@
 #include <linux/mm.h>
 #include <linux/scatterlist.h>
 #include <linux/dma-attrs.h>
+#include <linux/dma-debug.h>
 #include <asm/io.h>
+#include <asm/swiotlb.h>
 
 #define DMA_ERROR_CODE		(~(dma_addr_t)0x0)
 
+/* Some dma direct funcs must be visible for use in other dma_ops */
+extern void *dma_direct_alloc_coherent(struct device *dev, size_t size,
+				       dma_addr_t *dma_handle, gfp_t flag,
+				       struct dma_attrs *attrs);
+extern void dma_direct_free_coherent(struct device *dev, size_t size,
+				     void *vaddr, dma_addr_t dma_handle,
+				     struct dma_attrs *attrs);
+extern int dma_direct_mmap_coherent(struct device *dev,
+				    struct vm_area_struct *vma,
+				    void *cpu_addr, dma_addr_t handle,
+				    size_t size, struct dma_attrs *attrs);
+
 #ifdef CONFIG_NOT_COHERENT_CACHE
 /*
  * DMA-consistent mapping functions for PowerPCs that don't support
@@ -26,26 +40,27 @@
  * allocate the space "normally" and use the cache management functions
  * to ensure it is consistent.
  */
-extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
+struct device;
+extern void *__dma_alloc_coherent(struct device *dev, size_t size,
+				  dma_addr_t *handle, gfp_t gfp);
 extern void __dma_free_coherent(size_t size, void *vaddr);
 extern void __dma_sync(void *vaddr, size_t size, int direction);
 extern void __dma_sync_page(struct page *page, unsigned long offset,
 				 size_t size, int direction);
+extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr);
 
 #else /* ! CONFIG_NOT_COHERENT_CACHE */
 /*
  * Cache coherent cores.
  */
 
-#define __dma_alloc_coherent(gfp, size, handle)	NULL
+#define __dma_alloc_coherent(dev, gfp, size, handle)	NULL
 #define __dma_free_coherent(size, addr)		((void)0)
 #define __dma_sync(addr, size, rw)		((void)0)
 #define __dma_sync_page(pg, off, sz, rw)	((void)0)
 
 #endif /* ! CONFIG_NOT_COHERENT_CACHE */
 
-#ifdef CONFIG_PPC64
-
 static inline unsigned long device_to_mask(struct device *dev)
 {
 	if (dev->dma_mask && *dev->dma_mask)
@@ -55,413 +70,149 @@ static inline unsigned long device_to_mask(struct device *dev)
 }
 
 /*
- * DMA operations are abstracted for G5 vs. i/pSeries, PCI vs. VIO
+ * Available generic sets of operations
  */
-struct dma_mapping_ops {
-	void *		(*alloc_coherent)(struct device *dev, size_t size,
-				dma_addr_t *dma_handle, gfp_t flag);
-	void		(*free_coherent)(struct device *dev, size_t size,
-				void *vaddr, dma_addr_t dma_handle);
-	dma_addr_t	(*map_single)(struct device *dev, void *ptr,
-				size_t size, enum dma_data_direction direction,
-				struct dma_attrs *attrs);
-	void		(*unmap_single)(struct device *dev, dma_addr_t dma_addr,
-				size_t size, enum dma_data_direction direction,
-				struct dma_attrs *attrs);
-	int		(*map_sg)(struct device *dev, struct scatterlist *sg,
-				int nents, enum dma_data_direction direction,
-				struct dma_attrs *attrs);
-	void		(*unmap_sg)(struct device *dev, struct scatterlist *sg,
-				int nents, enum dma_data_direction direction,
-				struct dma_attrs *attrs);
-	int		(*dma_supported)(struct device *dev, u64 mask);
-	int		(*set_dma_mask)(struct device *dev, u64 dma_mask);
-};
-
-static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
+#ifdef CONFIG_PPC64
+extern struct dma_map_ops dma_iommu_ops;
+#endif
+extern struct dma_map_ops dma_direct_ops;
+
+static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 {
 	/* We don't handle the NULL dev case for ISA for now. We could
 	 * do it via an out of line call but it is not needed for now. The
 	 * only ISA DMA device we support is the floppy and we have a hack
 	 * in the floppy driver directly to get a device for us.
 	 */
-	if (unlikely(dev == NULL || dev->archdata.dma_ops == NULL))
+	if (unlikely(dev == NULL))
 		return NULL;
+
 	return dev->archdata.dma_ops;
 }
 
-static inline void set_dma_ops(struct device *dev, struct dma_mapping_ops *ops)
+static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
 {
 	dev->archdata.dma_ops = ops;
 }
 
-static inline int dma_supported(struct device *dev, u64 mask)
+/*
+ * get_dma_offset()
+ *
+ * Get the dma offset on configurations where the dma address can be determined
+ * from the physical address by looking at a simple offset.  Direct dma and
+ * swiotlb use this function, but it is typically not used by implementations
+ * with an iommu.
+ */
+static inline dma_addr_t get_dma_offset(struct device *dev)
 {
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+	if (dev)
+		return dev->archdata.dma_data.dma_offset;
 
-	if (unlikely(dma_ops == NULL))
-		return 0;
-	if (dma_ops->dma_supported == NULL)
-		return 1;
-	return dma_ops->dma_supported(dev, mask);
+	return PCI_DRAM_OFFSET;
 }
 
-/* We have our own implementation of pci_set_dma_mask() */
-#define HAVE_ARCH_PCI_SET_DMA_MASK
-
-static inline int dma_set_mask(struct device *dev, u64 dma_mask)
+static inline void set_dma_offset(struct device *dev, dma_addr_t off)
 {
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-
-	if (unlikely(dma_ops == NULL))
-		return -EIO;
-	if (dma_ops->set_dma_mask != NULL)
-		return dma_ops->set_dma_mask(dev, dma_mask);
-	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
-		return -EIO;
-	*dev->dma_mask = dma_mask;
-	return 0;
+	if (dev)
+		dev->archdata.dma_data.dma_offset = off;
 }
 
-static inline dma_addr_t dma_map_single_attrs(struct device *dev,
-					      void *cpu_addr,
-					      size_t size,
-					      enum dma_data_direction direction,
-					      struct dma_attrs *attrs)
-{
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+/* this will be removed soon */
+#define flush_write_buffers()
 
-	BUG_ON(!dma_ops);
-	return dma_ops->map_single(dev, cpu_addr, size, direction, attrs);
-}
+#include <asm-generic/dma-mapping-common.h>
 
-static inline void dma_unmap_single_attrs(struct device *dev,
-					  dma_addr_t dma_addr,
-					  size_t size,
-					  enum dma_data_direction direction,
-					  struct dma_attrs *attrs)
+static inline int dma_supported(struct device *dev, u64 mask)
 {
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+	struct dma_map_ops *dma_ops = get_dma_ops(dev);
 
-	BUG_ON(!dma_ops);
-	dma_ops->unmap_single(dev, dma_addr, size, direction, attrs);
+	if (unlikely(dma_ops == NULL))
+		return 0;
+	if (dma_ops->dma_supported == NULL)
+		return 1;
+	return dma_ops->dma_supported(dev, mask);
 }
 
-static inline dma_addr_t dma_map_page_attrs(struct device *dev,
-					    struct page *page,
-					    unsigned long offset, size_t size,
-					    enum dma_data_direction direction,
-					    struct dma_attrs *attrs)
-{
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+extern int dma_set_mask(struct device *dev, u64 dma_mask);
+extern int __dma_set_mask(struct device *dev, u64 dma_mask);
 
-	BUG_ON(!dma_ops);
-	return dma_ops->map_single(dev, page_address(page) + offset, size,
-			direction, attrs);
-}
+#define dma_alloc_coherent(d,s,h,f)	dma_alloc_attrs(d,s,h,f,NULL)
 
-static inline void dma_unmap_page_attrs(struct device *dev,
-					dma_addr_t dma_address,
-					size_t size,
-					enum dma_data_direction direction,
-					struct dma_attrs *attrs)
+static inline void *dma_alloc_attrs(struct device *dev, size_t size,
+				    dma_addr_t *dma_handle, gfp_t flag,
+				    struct dma_attrs *attrs)
 {
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+	struct dma_map_ops *dma_ops = get_dma_ops(dev);
+	void *cpu_addr;
 
 	BUG_ON(!dma_ops);
-	dma_ops->unmap_single(dev, dma_address, size, direction, attrs);
-}
 
-static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
-				   int nents, enum dma_data_direction direction,
-				   struct dma_attrs *attrs)
-{
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-
-	BUG_ON(!dma_ops);
-	return dma_ops->map_sg(dev, sg, nents, direction, attrs);
-}
+	cpu_addr = dma_ops->alloc(dev, size, dma_handle, flag, attrs);
 
-static inline void dma_unmap_sg_attrs(struct device *dev,
-				      struct scatterlist *sg,
-				      int nhwentries,
-				      enum dma_data_direction direction,
-				      struct dma_attrs *attrs)
-{
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+	debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
 
-	BUG_ON(!dma_ops);
-	dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
+	return cpu_addr;
 }
 
-static inline void *dma_alloc_coherent(struct device *dev, size_t size,
-				       dma_addr_t *dma_handle, gfp_t flag)
-{
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
-
-	BUG_ON(!dma_ops);
-	return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
-}
+#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
 
-static inline void dma_free_coherent(struct device *dev, size_t size,
-				     void *cpu_addr, dma_addr_t dma_handle)
+static inline void dma_free_attrs(struct device *dev, size_t size,
+				  void *cpu_addr, dma_addr_t dma_handle,
+				  struct dma_attrs *attrs)
 {
-	struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+	struct dma_map_ops *dma_ops = get_dma_ops(dev);
 
 	BUG_ON(!dma_ops);
-	dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
-}
-
-static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
-					size_t size,
-					enum dma_data_direction direction)
-{
-	return dma_map_single_attrs(dev, cpu_addr, size, direction, NULL);
-}
 
-static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
-				    size_t size,
-				    enum dma_data_direction direction)
-{
-	dma_unmap_single_attrs(dev, dma_addr, size, direction, NULL);
-}
-
-static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
-				      unsigned long offset, size_t size,
-				      enum dma_data_direction direction)
-{
-	return dma_map_page_attrs(dev, page, offset, size, direction, NULL);
-}
+	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 
-static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-				  size_t size,
-				  enum dma_data_direction direction)
-{
-	dma_unmap_page_attrs(dev, dma_address, size, direction, NULL);
+	dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
 }
 
-static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
-			     int nents, enum dma_data_direction direction)
-{
-	return dma_map_sg_attrs(dev, sg, nents, direction, NULL);
-}
-
-static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-				int nhwentries,
-				enum dma_data_direction direction)
-{
-	dma_unmap_sg_attrs(dev, sg, nhwentries, direction, NULL);
-}
-
-/*
- * Available generic sets of operations
- */
-extern struct dma_mapping_ops dma_iommu_ops;
-extern struct dma_mapping_ops dma_direct_ops;
-
-#else /* CONFIG_PPC64 */
-
-#define dma_supported(dev, mask)	(1)
-
-static inline int dma_set_mask(struct device *dev, u64 dma_mask)
-{
-	if (!dev->dma_mask || !dma_supported(dev, mask))
-		return -EIO;
-
-	*dev->dma_mask = dma_mask;
-
-	return 0;
-}
-
-static inline void *dma_alloc_coherent(struct device *dev, size_t size,
-				       dma_addr_t * dma_handle,
-				       gfp_t gfp)
+static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
-#ifdef CONFIG_NOT_COHERENT_CACHE
-	return __dma_alloc_coherent(size, dma_handle, gfp);
-#else
-	void *ret;
-	/* ignore region specifiers */
-	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
-
-	if (dev == NULL || dev->coherent_dma_mask < 0xffffffff)
-		gfp |= GFP_DMA;
-
-	ret = (void *)__get_free_pages(gfp, get_order(size));
+	struct dma_map_ops *dma_ops = get_dma_ops(dev);
 
-	if (ret != NULL) {
-		memset(ret, 0, size);
-		*dma_handle = virt_to_bus(ret);
-	}
+	debug_dma_mapping_error(dev, dma_addr);
+	if (dma_ops->mapping_error)
+		return dma_ops->mapping_error(dev, dma_addr);
 
-	return ret;
-#endif
-}
-
-static inline void
-dma_free_coherent(struct device *dev, size_t size, void *vaddr,
-		  dma_addr_t dma_handle)
-{
-#ifdef CONFIG_NOT_COHERENT_CACHE
-	__dma_free_coherent(size, vaddr);
+#ifdef CONFIG_PPC64
+	return (dma_addr == DMA_ERROR_CODE);
 #else
-	free_pages((unsigned long)vaddr, get_order(size));
+	return 0;
 #endif
 }
 
-static inline dma_addr_t
-dma_map_single(struct device *dev, void *ptr, size_t size,
-	       enum dma_data_direction direction)
-{
-	BUG_ON(direction == DMA_NONE);
-
-	__dma_sync(ptr, size, direction);
-
-	return virt_to_bus(ptr);
-}
-
-static inline void dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
-				    size_t size,
-				    enum dma_data_direction direction)
-{
-	/* We do nothing. */
-}
-
-static inline dma_addr_t
-dma_map_page(struct device *dev, struct page *page,
-	     unsigned long offset, size_t size,
-	     enum dma_data_direction direction)
-{
-	BUG_ON(direction == DMA_NONE);
-
-	__dma_sync_page(page, offset, size, direction);
-
-	return page_to_bus(page) + offset;
-}
-
-static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-				  size_t size,
-				  enum dma_data_direction direction)
-{
-	/* We do nothing. */
-}
-
-static inline int
-dma_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
-	   enum dma_data_direction direction)
-{
-	struct scatterlist *sg;
-	int i;
-
-	BUG_ON(direction == DMA_NONE);
-
-	for_each_sg(sgl, sg, nents, i) {
-		BUG_ON(!sg_page(sg));
-		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
-		sg->dma_address = page_to_bus(sg_page(sg)) + sg->offset;
-	}
-
-	return nents;
-}
-
-static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
-				int nhwentries,
-				enum dma_data_direction direction)
-{
-	/* We don't do anything here. */
-}
-
-#endif /* CONFIG_PPC64 */
-
-static inline void dma_sync_single_for_cpu(struct device *dev,
-		dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction direction)
-{
-	BUG_ON(direction == DMA_NONE);
-	__dma_sync(bus_to_virt(dma_handle), size, direction);
-}
-
-static inline void dma_sync_single_for_device(struct device *dev,
-		dma_addr_t dma_handle, size_t size,
-		enum dma_data_direction direction)
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 {
-	BUG_ON(direction == DMA_NONE);
-	__dma_sync(bus_to_virt(dma_handle), size, direction);
-}
+#ifdef CONFIG_SWIOTLB
+	struct dev_archdata *sd = &dev->archdata;
 
-static inline void dma_sync_sg_for_cpu(struct device *dev,
-		struct scatterlist *sgl, int nents,
-		enum dma_data_direction direction)
-{
-	struct scatterlist *sg;
-	int i;
+	if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
+		return 0;
+#endif
 
-	BUG_ON(direction == DMA_NONE);
+	if (!dev->dma_mask)
+		return 0;
 
-	for_each_sg(sgl, sg, nents, i)
-		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+	return addr + size - 1 <= *dev->dma_mask;
 }
 
-static inline void dma_sync_sg_for_device(struct device *dev,
-		struct scatterlist *sgl, int nents,
-		enum dma_data_direction direction)
+static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
-	struct scatterlist *sg;
-	int i;
-
-	BUG_ON(direction == DMA_NONE);
-
-	for_each_sg(sgl, sg, nents, i)
-		__dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
+	return paddr + get_dma_offset(dev);
 }
 
-static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
-#ifdef CONFIG_PPC64
-	return (dma_addr == DMA_ERROR_CODE);
-#else
-	return 0;
-#endif
+	return daddr - get_dma_offset(dev);
 }
 
 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
-#ifdef CONFIG_NOT_COHERENT_CACHE
-#define dma_is_consistent(d, h)	(0)
-#else
-#define dma_is_consistent(d, h)	(1)
-#endif
 
-static inline int dma_get_cache_alignment(void)
-{
-#ifdef CONFIG_PPC64
-	/* no easy way to get cache size on all processors, so return
-	 * the maximum possible, to be safe */
-	return (1 << INTERNODE_CACHE_SHIFT);
-#else
-	/*
-	 * Each processor family will define its own L1_CACHE_SHIFT,
-	 * L1_CACHE_BYTES wraps to this, so this is always safe.
-	 */
-	return L1_CACHE_BYTES;
-#endif
-}
-
-static inline void dma_sync_single_range_for_cpu(struct device *dev,
-		dma_addr_t dma_handle, unsigned long offset, size_t size,
-		enum dma_data_direction direction)
-{
-	/* just sync everything for now */
-	dma_sync_single_for_cpu(dev, dma_handle, offset + size, direction);
-}
-
-static inline void dma_sync_single_range_for_device(struct device *dev,
-		dma_addr_t dma_handle, unsigned long offset, size_t size,
-		enum dma_data_direction direction)
-{
-	/* just sync everything for now */
-	dma_sync_single_for_device(dev, dma_handle, offset + size, direction);
-}
+#define ARCH_HAS_DMA_MMAP_COHERENT
 
 static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 		enum dma_data_direction direction)