MIPS: Synchronize dma_map_page and dma_map_single

Synchronize dma_map_page/dma_unmap_page and dma_map_single/dma_unmap_single.
This will reduce unnecessary writebacks and invalidates.

[Ralf: make dma_unmap_page an inline function.]

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 8 insertions, 20 deletions

diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index c64afb40cd06..d16afddb09a9 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -24,8 +24,13 @@ extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
         enum dma_data_direction direction);
 extern dma_addr_t dma_map_page(struct device *dev, struct page *page,
         unsigned long offset, size_t size, enum dma_data_direction direction);
-extern void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
-        size_t size, enum dma_data_direction direction);
+
+static inline void dma_unmap_page(struct device *dev, dma_addr_t dma_address,
+        size_t size, enum dma_data_direction direction)
+{
+        dma_unmap_single(dev, dma_address, size, direction);
+}
+
 extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
         int nhwentries, enum dma_data_direction direction);
 extern void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index bed56f1ac837..4fdb7f5216b9 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -209,7 +209,7 @@ dma_addr_t dma_map_page(struct device *dev, struct page *page,
                 unsigned long addr;
 
                 addr = (unsigned long) page_address(page) + offset;
-                dma_cache_wback_inv(addr, size);
+                __dma_sync(addr, size, direction);
         }
 
         return plat_map_dma_mem_page(dev, page) + offset;
@@ -217,23 +217,6 @@ dma_addr_t dma_map_page(struct device *dev, struct page *page,
 
 EXPORT_SYMBOL(dma_map_page);
 
-void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
-        enum dma_data_direction direction)
-{
-        BUG_ON(direction == DMA_NONE);
-
-        if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
-                unsigned long addr;
-
-                addr = dma_addr_to_virt(dma_address);
-                dma_cache_wback_inv(addr, size);
-        }
-
-        plat_unmap_dma_mem(dev, dma_address);
-}
-
-EXPORT_SYMBOL(dma_unmap_page);
-
 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
         enum dma_data_direction direction)
 {