sh: Add support for DMA API debugging.

This wires up support for the generic DMA API debugging.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -14,6 +14,7 @@ config SUPERH
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_IOREMAP_PROT if MMU
 	select HAVE_ARCH_TRACEHOOK
+	select HAVE_DMA_API_DEBUG
 	help
 	  The SuperH is a RISC processor targeted for use in embedded systems
 	  and consumer electronics; it was also used in the Sega Dreamcast

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

@@ -3,6 +3,7 @@
 
 #include <linux/mm.h>
 #include <linux/scatterlist.h>
+#include <linux/dma-debug.h>
 #include <asm/cacheflush.h>
 #include <asm/io.h>
 #include <asm-generic/dma-coherent.h>
@@ -38,16 +39,26 @@ static inline dma_addr_t dma_map_single(struct device *dev,
 					void *ptr, size_t size,
 					enum dma_data_direction dir)
 {
+	dma_addr_t addr = virt_to_phys(ptr);
+
 #if defined(CONFIG_PCI) && !defined(CONFIG_SH_PCIDMA_NONCOHERENT)
 	if (dev->bus == &pci_bus_type)
-		return virt_to_phys(ptr);
+		return addr;
 #endif
 	dma_cache_sync(dev, ptr, size, dir);
 
-	return virt_to_phys(ptr);
+	debug_dma_map_page(dev, virt_to_page(ptr),
+			   (unsigned long)ptr & ~PAGE_MASK, size,
+			   dir, addr, true);
+
+	return addr;
 }
 
-#define dma_unmap_single(dev, addr, size, dir)	do { } while (0)
+static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
+				    size_t size, enum dma_data_direction dir)
+{
+	debug_dma_unmap_page(dev, addr, size, dir, true);
+}
 
 static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
 			     int nents, enum dma_data_direction dir)
@@ -59,12 +70,19 @@ static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
 		dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, dir);
 #endif
 		sg[i].dma_address = sg_phys(&sg[i]);
+		sg[i].dma_length = sg[i].length;
 	}
 
+	debug_dma_map_sg(dev, sg, nents, i, dir);
+
 	return nents;
 }
 
-#define dma_unmap_sg(dev, sg, nents, dir)	do { } while (0)
+static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+				int nents, enum dma_data_direction dir)
+{
+	debug_dma_unmap_sg(dev, sg, nents, dir);
+}
 
 static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
 				      unsigned long offset, size_t size,
@@ -111,6 +129,7 @@ static inline void dma_sync_sg(struct device *dev, struct scatterlist *sg,
 		dma_cache_sync(dev, sg_virt(&sg[i]), sg[i].length, dir);
 #endif
 		sg[i].dma_address = sg_phys(&sg[i]);
+		sg[i].dma_length = sg[i].length;
 	}
 }
 
@@ -119,6 +138,7 @@ static inline void dma_sync_single_for_cpu(struct device *dev,
 					   enum dma_data_direction dir)
 {
 	dma_sync_single(dev, dma_handle, size, dir);
+	debug_dma_sync_single_for_cpu(dev, dma_handle, size, dir);
 }
 
 static inline void dma_sync_single_for_device(struct device *dev,
@@ -127,6 +147,7 @@ static inline void dma_sync_single_for_device(struct device *dev,
 					      enum dma_data_direction dir)
 {
 	dma_sync_single(dev, dma_handle, size, dir);
+	debug_dma_sync_single_for_device(dev, dma_handle, size, dir);
 }
 
 static inline void dma_sync_single_range_for_cpu(struct device *dev,
@@ -136,6 +157,8 @@ static inline void dma_sync_single_range_for_cpu(struct device *dev,
 						 enum dma_data_direction direction)
 {
 	dma_sync_single_for_cpu(dev, dma_handle+offset, size, direction);
+	debug_dma_sync_single_range_for_cpu(dev, dma_handle,
+					    offset, size, direction);
 }
 
 static inline void dma_sync_single_range_for_device(struct device *dev,
@@ -145,6 +168,8 @@ static inline void dma_sync_single_range_for_device(struct device *dev,
 						    enum dma_data_direction direction)
 {
 	dma_sync_single_for_device(dev, dma_handle+offset, size, direction);
+	debug_dma_sync_single_range_for_device(dev, dma_handle,
+					       offset, size, direction);
 }
 
 
@@ -153,6 +178,7 @@ static inline void dma_sync_sg_for_cpu(struct device *dev,
 				       enum dma_data_direction dir)
 {
 	dma_sync_sg(dev, sg, nelems, dir);
+	debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
 }
 
 static inline void dma_sync_sg_for_device(struct device *dev,
@@ -160,9 +186,9 @@ static inline void dma_sync_sg_for_device(struct device *dev,
 					  enum dma_data_direction dir)
 {
 	dma_sync_sg(dev, sg, nelems, dir);
+	debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
 }
 
-
 static inline int dma_get_cache_alignment(void)
 {
 	/*

arch/sh/include/asm/scatterlist.h

@@ -5,12 +5,13 @@
 
 struct scatterlist {
 #ifdef CONFIG_DEBUG_SG
-    unsigned long sg_magic;
+	unsigned long	sg_magic;
 #endif
-    unsigned long page_link;
+	unsigned long	page_link;
-    unsigned int offset;/* for highmem, page offset */
+	unsigned int	offset;		/* for highmem, page offset */
-    dma_addr_t dma_address;
+	unsigned int	length;
-    unsigned int length;
+	dma_addr_t	dma_address;
+	unsigned int	dma_length;
 };
 
 #define ISA_DMA_THRESHOLD	PHYS_ADDR_MASK

arch/sh/mm/consistent.c

@@ -12,6 +12,7 @@
 #include <linux/mm.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
+#include <linux/dma-debug.h>
 #include <asm/cacheflush.h>
 #include <asm/addrspace.h>
 #include <asm/io.h>
@@ -45,6 +46,9 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
 	split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
 
 	*dma_handle = virt_to_phys(ret);
+
+	debug_dma_alloc_coherent(dev, size, *dma_handle, ret_nocache);
+
 	return ret_nocache;
 }
 EXPORT_SYMBOL(dma_alloc_coherent);
@@ -56,12 +60,15 @@ void dma_free_coherent(struct device *dev, size_t size,
 	unsigned long pfn = dma_handle >> PAGE_SHIFT;
 	int k;
 
-	if (!dma_release_from_coherent(dev, order, vaddr)) {
+	WARN_ON(irqs_disabled());	/* for portability */
-		WARN_ON(irqs_disabled());	/* for portability */
+
-		for (k = 0; k < (1 << order); k++)
+	if (dma_release_from_coherent(dev, order, vaddr))
-			__free_pages(pfn_to_page(pfn + k), 0);
+		return;
-		iounmap(vaddr);
+
-	}
+	debug_dma_free_coherent(dev, size, vaddr, dma_handle);
+	for (k = 0; k < (1 << order); k++)
+		__free_pages(pfn_to_page(pfn + k), 0);
+	iounmap(vaddr);
 }
 EXPORT_SYMBOL(dma_free_coherent);