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Subject[PATCH 09/10] x86: add checks for sync_single_range* code
Date
Impact: detect bugs in sync_single_range* usage

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/include/asm/dma-mapping.h | 4 ++++
arch/x86/include/asm/dma_debug.h | 26 ++++++++++++++++++++++++++
arch/x86/kernel/pci-dma-debug.c | 17 +++++++++++++++++
3 files changed, 47 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 63bed40..2b6399d 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -185,6 +185,8 @@ dma_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dma_handle,
if (ops->sync_single_range_for_cpu)
ops->sync_single_range_for_cpu(hwdev, dma_handle, offset,
size, direction);
+ debug_sync_single_range_for_cpu(hwdev, dma_handle, offset,
+ size, direction);
flush_write_buffers();
}

@@ -199,6 +201,8 @@ dma_sync_single_range_for_device(struct device *hwdev, dma_addr_t dma_handle,
if (ops->sync_single_range_for_device)
ops->sync_single_range_for_device(hwdev, dma_handle,
offset, size, direction);
+ debug_sync_single_range_for_device(hwdev, dma_handle, offset,
+ size, direction);
flush_write_buffers();
}

diff --git a/arch/x86/include/asm/dma_debug.h b/arch/x86/include/asm/dma_debug.h
index 8262cd1..bc4a841 100644
--- a/arch/x86/include/asm/dma_debug.h
+++ b/arch/x86/include/asm/dma_debug.h
@@ -75,6 +75,17 @@ extern
void debug_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
size_t size, int direction);

+extern
+void debug_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ unsigned long offset, size_t size,
+ int direction);
+
+extern
+void debug_sync_single_range_for_device(struct device *dev,
+ dma_addr_t dma_handle,
+ unsigned long offset,
+ size_t size, int direction);
+
#else /* CONFIG_DMA_API_DEBUG */

static inline
@@ -130,6 +141,21 @@ void debug_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
{
}

+static inline
+void debug_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ unsigned long offset, size_t size,
+ int direction)
+{
+}
+
+static inline
+void debug_sync_single_range_for_device(struct device *dev,
+ dma_addr_t dma_handle,
+ unsigned long offset,
+ 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 1dfcd33..92b9491 100644
--- a/arch/x86/kernel/pci-dma-debug.c
+++ b/arch/x86/kernel/pci-dma-debug.c
@@ -422,3 +422,20 @@ void debug_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
}
EXPORT_SYMBOL(debug_sync_single_for_device);

+void debug_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+ unsigned long offset, size_t size,
+ int direction)
+{
+ check_sync(dev, dma_handle, size, offset, direction, true);
+}
+EXPORT_SYMBOL(debug_sync_single_range_for_cpu);
+
+void debug_sync_single_range_for_device(struct device *dev,
+ dma_addr_t dma_handle,
+ unsigned long offset,
+ size_t size, int direction)
+{
+ check_sync(dev, dma_handle, size, offset, direction, false);
+}
+EXPORT_SYMBOL(debug_sync_single_range_for_device);
+
--
1.5.6.4



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