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dma-debug: New interfaces to debug dma mapping errors

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Add dma-debug interface debug_dma_mapping_error() to debug
drivers that fail to check dma mapping errors on addresses
returned by dma_map_single() and dma_map_page() interfaces.
This interface clears a flag set by debug_dma_map_page() to
indicate that dma_mapping_error() has been called by the
driver. When driver does unmap, debug_dma_unmap() checks the
flag and if this flag is still set, prints warning message
that includes call trace that leads up to the unmap. This
interface can be called from dma_mapping_error() routines to
enable dma mapping error check debugging.

Tested: Intel iommu and swiotlb (iommu=soft) on x86-64 with
        CONFIG_DMA_API_DEBUG enabled and disabled.

Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Shuah Khan 2012-10-08 11:08:06 -06:00 • committed by Joerg Roedel
parent 6f0c0580b7
commit 6c9c6d6301
4 changed files with 87 additions and 4 deletions
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7
include/linux/dma-debug.h
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@ -39,6 +39,8 @@ extern void debug_dma_map_page(struct device *dev, struct page *page,
int direction, dma_addr_t dma_addr,
bool map_single);
extern void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
extern void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
size_t size, int direction, bool map_single);
@ -105,6 +107,11 @@ static inline void debug_dma_map_page(struct device *dev, struct page *page,
{
}
static inline void debug_dma_mapping_error(struct device *dev,
dma_addr_t dma_addr)
{
}
static inline void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
size_t size, int direction,
bool map_single)