Merge branch 'for-v3.18' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping

Pull dma-mapping update from Marek Szyprowski:
 "Provide the dma write coherent api (available previously on ARM
  architecture) for all other architectures, which use dma_ops-based dma
  mapping implementation.

  This lets one to use the same code in the device drivers regardless of
  the selected architecture"

* 'for-v3.18' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
  dma-mapping: Provide write-combine allocations
  s390: Implement dma_{alloc,free}_attrs()

arch/arm/include/asm/dma-mapping.h

@@ -265,22 +265,6 @@ extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
 			void *cpu_addr, dma_addr_t dma_addr, size_t size,
 			struct dma_attrs *attrs);
 
-static inline void *dma_alloc_writecombine(struct device *dev, size_t size,
-				       dma_addr_t *dma_handle, gfp_t flag)
-{
-	DEFINE_DMA_ATTRS(attrs);
-	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
-	return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs);
-}
-
-static inline void dma_free_writecombine(struct device *dev, size_t size,
-				     void *cpu_addr, dma_addr_t dma_handle)
-{
-	DEFINE_DMA_ATTRS(attrs);
-	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
-	return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
-}
-
 /*
  * This can be called during early boot to increase the size of the atomic
  * coherent DMA pool above the default value of 256KiB. It must be called

arch/s390/Kconfig

@@ -496,8 +496,8 @@ config QDIO
 
 menuconfig PCI
 	bool "PCI support"
-	default n
 	depends on 64BIT
+	select HAVE_DMA_ATTRS
 	select PCI_MSI
 	help
 	  Enable PCI support.
@@ -544,9 +544,6 @@ config HAS_DMA
 config NEED_SG_DMA_LENGTH
 	def_bool PCI
 
-config HAVE_DMA_ATTRS
-	def_bool PCI
-
 config NEED_DMA_MAP_STATE
 	def_bool PCI
 

arch/s390/include/asm/dma-mapping.h

@@ -56,24 +56,35 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 	return dma_addr == DMA_ERROR_CODE;
 }
 
-static inline void *dma_alloc_coherent(struct device *dev, size_t size,
+#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
-				       dma_addr_t *dma_handle, gfp_t flag)
+
+static inline void *dma_alloc_attrs(struct device *dev, size_t size,
+				    dma_addr_t *dma_handle, gfp_t flags,
+				    struct dma_attrs *attrs)
 {
 	struct dma_map_ops *ops = get_dma_ops(dev);
-	void *ret;
+	void *cpu_addr;
 
-	ret = ops->alloc(dev, size, dma_handle, flag, NULL);
+	BUG_ON(!ops);
-	debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
+
-	return ret;
+	cpu_addr = ops->alloc(dev, size, dma_handle, flags, attrs);
+	debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
+
+	return cpu_addr;
 }
 
-static inline void dma_free_coherent(struct device *dev, size_t size,
+#define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL)
-				     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_map_ops *dma_ops = get_dma_ops(dev);
+	struct dma_map_ops *ops = get_dma_ops(dev);
+
+	BUG_ON(!ops);
 
 	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
-	dma_ops->free(dev, size, cpu_addr, dma_handle, NULL);
+	ops->free(dev, size, cpu_addr, dma_handle, attrs);
 }
 
 #endif /* _ASM_S390_DMA_MAPPING_H */

include/asm-generic/dma-mapping-common.h

@@ -214,14 +214,6 @@ dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
 
 #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL)
 
-static inline int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma,
-		      void *cpu_addr, dma_addr_t dma_addr, size_t size)
-{
-	DEFINE_DMA_ATTRS(attrs);
-	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
-	return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
-}
-
 int
 dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
 		       void *cpu_addr, dma_addr_t dma_addr, size_t size);

include/linux/dma-mapping.h

@@ -263,6 +263,32 @@ struct dma_attrs;
 #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
 	dma_unmap_sg(dev, sgl, nents, dir)
 
+#else
+static inline void *dma_alloc_writecombine(struct device *dev, size_t size,
+					   dma_addr_t *dma_addr, gfp_t gfp)
+{
+	DEFINE_DMA_ATTRS(attrs);
+	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
+	return dma_alloc_attrs(dev, size, dma_addr, gfp, &attrs);
+}
+
+static inline void dma_free_writecombine(struct device *dev, size_t size,
+					 void *cpu_addr, dma_addr_t dma_addr)
+{
+	DEFINE_DMA_ATTRS(attrs);
+	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
+	return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs);
+}
+
+static inline int dma_mmap_writecombine(struct device *dev,
+					struct vm_area_struct *vma,
+					void *cpu_addr, dma_addr_t dma_addr,
+					size_t size)
+{
+	DEFINE_DMA_ATTRS(attrs);
+	dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
+	return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs);
+}
 #endif /* CONFIG_HAVE_DMA_ATTRS */
 
 #ifdef CONFIG_NEED_DMA_MAP_STATE