[PATCH 08/10] x86: add checks for sync_single* code

[Joerg Roedel <joerg.roedel@amd.com>]

Impact: detect bugs in sync_single* usage

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 arch/x86/include/asm/dma-mapping.h |    2 ++
 arch/x86/include/asm/dma_debug.h   |   20 ++++++++++++++++++++
 arch/x86/kernel/pci-dma-debug.c    |   14 ++++++++++++++
 3 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 2893adb..63bed40 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -158,6 +158,7 @@ dma_sync_single_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
 	BUG_ON(!valid_dma_direction(direction));
 	if (ops->sync_single_for_cpu)
 		ops->sync_single_for_cpu(hwdev, dma_handle, size, direction);
+	debug_sync_single_for_cpu(hwdev, dma_handle, size, direction);
 	flush_write_buffers();
 }
 
@@ -170,6 +171,7 @@ dma_sync_single_for_device(struct device *hwdev, dma_addr_t dma_handle,
 	BUG_ON(!valid_dma_direction(direction));
 	if (ops->sync_single_for_device)
 		ops->sync_single_for_device(hwdev, dma_handle, size, direction);
+	debug_sync_single_for_device(hwdev, dma_handle, size, direction);
 	flush_write_buffers();
 }
 
diff --git a/arch/x86/include/asm/dma_debug.h b/arch/x86/include/asm/dma_debug.h
index 7245e27..8262cd1 100644
--- a/arch/x86/include/asm/dma_debug.h
+++ b/arch/x86/include/asm/dma_debug.h
@@ -67,6 +67,14 @@ extern
 void debug_free_coherent(struct device *dev, size_t size,
 			 void *virt, dma_addr_t addr);
 
+extern
+void debug_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+			       size_t size, int direction);
+
+extern
+void debug_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+				  size_t size, int direction);
+
 #else /* CONFIG_DMA_API_DEBUG */
 
 static inline
@@ -110,6 +118,18 @@ void debug_free_coherent(struct device *dev, size_t size,
 {
 }
 
+static inline
+void debug_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+			       size_t size, int direction)
+{
+}
+
+static inline
+void debug_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+				  size_t size, int direction)
+{
+}
+
 #endif /* CONFIG_DMA_API_DEBUG */
 
 #endif /* __ASM_X86_DMA_DEBUG */
diff --git a/arch/x86/kernel/pci-dma-debug.c b/arch/x86/kernel/pci-dma-debug.c
index db5ef9a..1dfcd33 100644
--- a/arch/x86/kernel/pci-dma-debug.c
+++ b/arch/x86/kernel/pci-dma-debug.c
@@ -408,3 +408,17 @@ void debug_free_coherent(struct device *dev, size_t size,
 }
 EXPORT_SYMBOL(debug_free_coherent);
 
+void debug_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
+			       size_t size, int direction)
+{
+	check_sync(dev, dma_handle, size, 0, direction, true);
+}
+EXPORT_SYMBOL(debug_sync_single_for_cpu);
+
+void debug_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
+				  size_t size, int direction)
+{
+	check_sync(dev, dma_handle, size, 0, direction, false);
+}
+EXPORT_SYMBOL(debug_sync_single_for_device);
+
-- 
1.5.6.4