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Commit f62bc980 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

dma-debug: add checking for map/unmap_page/single 



Impact: add debug callbacks for dma_{un}map_[page|single]

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 2d62ece1

include/linux/dma-debug.h

+23 −0
Original line number Diff line number Diff line
@@ -28,12 +28,35 @@ struct device; 


extern void dma_debug_init(u32 num_entries);



extern void debug_dma_map_page(struct device *dev, struct page *page,

			       size_t offset, size_t size,

			       int direction, dma_addr_t dma_addr,

			       bool map_single);



extern void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,

				 size_t size, int direction, bool map_single);





#else /* CONFIG_DMA_API_DEBUG */



static inline void dma_debug_init(u32 num_entries)

{

}



static inline void debug_dma_map_page(struct device *dev, struct page *page,

				      size_t offset, size_t size,

				      int direction, dma_addr_t dma_addr,

				      bool map_single)

{

}



static inline void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,

					size_t size, int direction,

					bool map_single)

{

}





#endif /* CONFIG_DMA_API_DEBUG */



#endif /* __DMA_DEBUG_H */

lib/dma-debug.c

+53 −0
Original line number Diff line number Diff line
@@ -566,3 +566,56 @@ static void check_sync(struct device *dev, dma_addr_t addr, 


}



void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,

			size_t size, int direction, dma_addr_t dma_addr,

			bool map_single)

{

	struct dma_debug_entry *entry;



	if (unlikely(global_disable))

		return;



	if (unlikely(dma_mapping_error(dev, dma_addr)))

		return;



	entry = dma_entry_alloc();

	if (!entry)

		return;



	entry->dev       = dev;

	entry->type      = dma_debug_page;

	entry->paddr     = page_to_phys(page) + offset;

	entry->dev_addr  = dma_addr;

	entry->size      = size;

	entry->direction = direction;



	if (map_single) {

		entry->type = dma_debug_single;

		check_for_stack(dev, page_address(page) + offset);

	}



	add_dma_entry(entry);

}

EXPORT_SYMBOL(debug_dma_map_page);



void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,

			  size_t size, int direction, bool map_single)

{

	struct dma_debug_entry ref = {

		.type           = dma_debug_page,

		.dev            = dev,

		.dev_addr       = addr,

		.size           = size,

		.direction      = direction,

	};



	if (unlikely(global_disable))

		return;



	if (map_single)

		ref.type = dma_debug_single;



	check_unmap(&ref);

}

EXPORT_SYMBOL(debug_dma_unmap_page);