powerpc: Rename get_dma_direct_offset get_dma_offset

The former is no longer really accurate with the swiotlb case now
a possibility.  I also move it into dma-mapping.h - it no longer
needs to be in dma.c, and there are about to be some more accessors
that should all end up in the same place.  A comment is added to
indicate that this function is not used in configs where there is no
simple dma offset, such as the iommu case.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 22 insertions, 14 deletions

diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index cb2ca41dd526..34b919fe8cda 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -26,7 +26,6 @@ extern void *dma_direct_alloc_coherent(struct device *dev, size_t size,
 extern void dma_direct_free_coherent(struct device *dev, size_t size,
                                      void *vaddr, dma_addr_t dma_handle);
 
-extern unsigned long get_dma_direct_offset(struct device *dev);
 
 #ifdef CONFIG_NOT_COHERENT_CACHE
 /*
@@ -90,6 +89,22 @@ static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
         dev->archdata.dma_ops = ops;
 }
 
+/*
+ * 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 unsigned long get_dma_offset(struct device *dev)
+{
+        if (dev)
+                return (unsigned long)dev->archdata.dma_data;
+
+        return PCI_DRAM_OFFSET;
+}
+
 /* this will be removed soon */
 #define flush_write_buffers()
 
@@ -181,12 +196,12 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 
 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
-        return paddr + get_dma_direct_offset(dev);
+        return paddr + get_dma_offset(dev);
 }
 
 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
 {
-        return daddr - get_dma_direct_offset(dev);
+        return daddr - get_dma_offset(dev);
 }
 
 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 21b784d7e7d0..6215062caf8c 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -21,13 +21,6 @@
  * default the offset is PCI_DRAM_OFFSET.
  */
 
-unsigned long get_dma_direct_offset(struct device *dev)
-{
-        if (dev)
-                return (unsigned long)dev->archdata.dma_data;
-
-        return PCI_DRAM_OFFSET;
-}
 
 void *dma_direct_alloc_coherent(struct device *dev, size_t size,
                                 dma_addr_t *dma_handle, gfp_t flag)
@@ -37,7 +30,7 @@ void *dma_direct_alloc_coherent(struct device *dev, size_t size,
         ret = __dma_alloc_coherent(dev, size, dma_handle, flag);
         if (ret == NULL)
                 return NULL;
-        *dma_handle += get_dma_direct_offset(dev);
+        *dma_handle += get_dma_offset(dev);
         return ret;
 #else
         struct page *page;
@@ -51,7 +44,7 @@ void *dma_direct_alloc_coherent(struct device *dev, size_t size,
                 return NULL;
         ret = page_address(page);
         memset(ret, 0, size);
-        *dma_handle = virt_to_abs(ret) + get_dma_direct_offset(dev);
+        *dma_handle = virt_to_abs(ret) + get_dma_offset(dev);
 
         return ret;
 #endif
@@ -75,7 +68,7 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
         int i;
 
         for_each_sg(sgl, sg, nents, i) {
-                sg->dma_address = sg_phys(sg) + get_dma_direct_offset(dev);
+                sg->dma_address = sg_phys(sg) + get_dma_offset(dev);
                 sg->dma_length = sg->length;
                 __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction);
         }
@@ -110,7 +103,7 @@ static inline dma_addr_t dma_direct_map_page(struct device *dev,
 {
         BUG_ON(dir == DMA_NONE);
         __dma_sync_page(page, offset, size, dir);
-        return page_to_phys(page) + offset + get_dma_direct_offset(dev);
+        return page_to_phys(page) + offset + get_dma_offset(dev);
 }
 
 static inline void dma_direct_unmap_page(struct device *dev,