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ARM: DMA: add support for DMA debugging

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Add ARM support for the DMA debug infrastructure, which allows the
DMA API usage to be debugged.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2011-01-03 11:29:28 +00:00
parent 9eedd96301
commit 24056f5250
4 changed files with 83 additions and 23 deletions
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65
arch/arm/include/asm/dma-mapping.h
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@@ -5,6 +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>
@@ -297,13 +298,13 @@ extern int dma_needs_bounce(struct device*, dma_addr_t, size_t);
/*
* The DMA API, implemented by dmabounce.c. See below for descriptions.
*/
extern dma_addr_t dma_map_single(struct device *, void *, size_t,
extern dma_addr_t __dma_map_single(struct device *, void *, size_t,
enum dma_data_direction);
extern void dma_unmap_single(struct device *, dma_addr_t, size_t,
extern void __dma_unmap_single(struct device *, dma_addr_t, size_t,
enum dma_data_direction);
extern dma_addr_t dma_map_page(struct device *, struct page *,
extern dma_addr_t __dma_map_page(struct device *, struct page *,
unsigned long, size_t, enum dma_data_direction);
extern void dma_unmap_page(struct device *, dma_addr_t, size_t,
extern void __dma_unmap_page(struct device *, dma_addr_t, size_t,
enum dma_data_direction);
/*
@@ -327,6 +328,34 @@ static inline int dmabounce_sync_for_device(struct device *d, dma_addr_t addr,
}
static inline dma_addr_t __dma_map_single(struct device *dev, void *cpu_addr,
size_t size, enum dma_data_direction dir)
{
__dma_single_cpu_to_dev(cpu_addr, size, dir);
return virt_to_dma(dev, 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_page_cpu_to_dev(page, offset, size, dir);
return pfn_to_dma(dev, page_to_pfn(page)) + offset;
}
static inline void __dma_unmap_single(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
__dma_single_dev_to_cpu(dma_to_virt(dev, handle), size, dir);
}
static inline void __dma_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
__dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
handle & ~PAGE_MASK, size, dir);
}
#endif /* CONFIG_DMABOUNCE */
/**
* dma_map_single - map a single buffer for streaming DMA
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
@@ -344,11 +373,16 @@ static inline int dmabounce_sync_for_device(struct device *d, dma_addr_t addr,
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));
__dma_single_cpu_to_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 virt_to_dma(dev, cpu_addr);
return addr;
}
/**
@@ -368,11 +402,14 @@ 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));
__dma_page_cpu_to_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 pfn_to_dma(dev, page_to_pfn(page)) + offset;
return addr;
}
/**
@@ -392,7 +429,8 @@ static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
static inline void dma_unmap_single(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir)
{
__dma_single_dev_to_cpu(dma_to_virt(dev, handle), size, dir);
debug_dma_unmap_page(dev, handle, size, dir, true);
__dma_unmap_single(dev, handle, size, dir);
}
/**
@@ -412,10 +450,9 @@ 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_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
handle & ~PAGE_MASK, size, dir);
debug_dma_unmap_page(dev, handle, size, dir, false);
__dma_unmap_page(dev, handle, size, dir);
}
#endif /* CONFIG_DMABOUNCE */
/**
* dma_sync_single_range_for_cpu
@@ -441,6 +478,8 @@ static inline void dma_sync_single_range_for_cpu(struct device *dev,
{
BUG_ON(!valid_dma_direction(dir));
debug_dma_sync_single_for_cpu(dev, handle + offset, size, dir);
if (!dmabounce_sync_for_cpu(dev, handle, offset, size, dir))
return;
@@ -453,6 +492,8 @@ static inline void dma_sync_single_range_for_device(struct device *dev,
{
BUG_ON(!valid_dma_direction(dir));
debug_dma_sync_single_for_device(dev, handle + offset, size, dir);
if (!dmabounce_sync_for_device(dev, handle, offset, size, dir))
return;