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Subject[PATCH 3/3] ARM:dma-mapping:Support DMA-API debugging facility on ARM
Date
From: Ming Lei <tom.leiming@gmail.com>


Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
arch/arm/Kconfig | 1 +
arch/arm/include/asm/dma-mapping.h | 38 ++++++++++++++++++++++++++++++-----
arch/arm/mm/dma-mapping.c | 11 ++++++++++
3 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a91da50..867e7c1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -18,6 +18,7 @@ config ARM
select HAVE_KRETPROBES if (HAVE_KPROBES)
select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
select HAVE_GENERIC_DMA_COHERENT
+ select HAVE_DMA_API_DEBUG
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index 86f2964..a288bab 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -5,7 +5,7 @@

#include <linux/mm_types.h>
#include <linux/scatterlist.h>
-
+#include <linux/dma-debug.h>
#include <asm-generic/dma-coherent.h>
#include <asm/memory.h>

@@ -146,7 +146,11 @@ extern void __dma_free_coherent(struct device *, size_t, void *, dma_addr_t);
static inline void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp)
{
- return __dma_alloc_coherent(dev, size, handle, gfp);
+ void *mem;
+
+ mem = __dma_alloc_coherent(dev, size, handle, gfp);
+ debug_dma_alloc_coherent(dev, size, *handle, mem);
+ return mem;
}

/**
@@ -165,6 +169,7 @@ static inline void *dma_alloc_coherent(struct device *dev, size_t size,
static inline void dma_free_coherent(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t handle)
{
+ debug_dma_free_coherent(dev, size, cpu_addr, handle);
__dma_free_coherent(dev, size, cpu_addr, handle);
}

@@ -333,8 +338,14 @@ static inline void __dma_unmap_single(struct device *dev, dma_addr_t handle,
static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
size_t size, enum dma_data_direction dir)
{
+ dma_addr_t addr;
BUG_ON(!valid_dma_direction(dir));
- return __dma_map_single(dev, cpu_addr, size, dir);
+
+ addr = __dma_map_single(dev, cpu_addr, size, dir);
+ debug_dma_map_page(dev, virt_to_page(cpu_addr),
+ (unsigned long)cpu_addr & ~PAGE_MASK, size,
+ dir, addr, true);
+ return addr;
}

/**
@@ -354,8 +365,12 @@ static inline dma_addr_t dma_map_single(struct device *dev, void *cpu_addr,
static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir)
{
+ dma_addr_t addr;
BUG_ON(!valid_dma_direction(dir));
- return __dma_map_page(dev, page, offset, size, dir);
+
+ addr = __dma_map_page(dev, page, offset, size, dir);
+ debug_dma_map_page(dev, page, offset, size, dir, addr, false);
+ return addr;
}

/**
@@ -376,6 +391,7 @@ static inline void dma_unmap_single(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
__dma_unmap_single(dev, handle, size, dir);
+ debug_dma_unmap_page(dev, handle, size, dir, true);
}

/**
@@ -395,7 +411,8 @@ static inline void dma_unmap_single(struct device *dev, dma_addr_t handle,
static inline void dma_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
- dma_unmap_single(dev, handle, size, dir);
+ __dma_unmap_single(dev, handle, size, dir);
+ debug_dma_unmap_page(dev, handle, size, dir, false);
}

/**
@@ -422,6 +439,7 @@ static inline void dma_sync_single_range_for_cpu(struct device *dev,
{
BUG_ON(!valid_dma_direction(dir));

+ debug_dma_sync_single_range_for_cpu(dev, handle, offset, size, dir);
dmabounce_sync_for_cpu(dev, handle, offset, size, dir);
}

@@ -431,6 +449,8 @@ static inline void dma_sync_single_range_for_device(struct device *dev,
{
BUG_ON(!valid_dma_direction(dir));

+ debug_dma_sync_single_range_for_device(dev, handle, offset, size, dir);
+
if (!dmabounce_sync_for_device(dev, handle, offset, size, dir))
return;

@@ -465,11 +485,15 @@ extern void __dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir)
{
- return __dma_map_sg(dev, sg, nents, dir);
+ int ents;
+ ents = __dma_map_sg(dev, sg, nents, dir);
+ debug_dma_map_sg(dev, sg, nents, ents, dir);
+ return ents;
}
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);
__dma_unmap_sg(dev, sg, nents, dir);
}
static inline void dma_sync_sg_for_cpu(struct device *dev,
@@ -477,12 +501,14 @@ static inline void dma_sync_sg_for_cpu(struct device *dev,
enum dma_data_direction dir)
{
__dma_sync_sg_for_cpu(dev, sg, nents, dir);
+ debug_dma_sync_sg_for_cpu(dev, sg, nents, dir);
}
static inline void dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sg, int nents,
enum dma_data_direction dir)
{
__dma_sync_sg_for_device(dev, sg, nents, dir);
+ debug_dma_sync_sg_for_device(dev, sg, nents, dir);
}

#endif /* __KERNEL__ */
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 654cd82..64e5d82 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -16,6 +16,7 @@
#include <linux/list.h>
#include <linux/init.h>
#include <linux/device.h>
+#include <linux/dma-debug.h>
#include <linux/dma-mapping.h>

#include <asm/memory.h>
@@ -688,3 +689,13 @@ void __dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
}
}
EXPORT_SYMBOL(__dma_sync_sg_for_device);
+
+#define PREALLOC_DMA_DEBUG_ENTRIES 8192
+
+static int __init dma_debug_init_arm(void)
+{
+ dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+ return 0;
+}
+fs_initcall(dma_debug_init_arm);
+
--
1.6.0.GIT


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