Commit c147d8ea authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Linus Torvalds
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dma-mapping: add asm-generic/dma-mapping-common.h 



We unified x86 and IA64's handling of multiple dma mapping operations
(struct dma_map_ops in linux/dma-mapping.h) so we can remove duplication
in their arch/include/asm/dma-mapping.h.

This patchset adds include/asm-generic/dma-mapping-common.h that provides
some generic dma mapping function definitions for the users of struct
dma_map_ops.  This enables us to remove about 100 lines.  This also
enables us to easily add CONFIG_DMA_API_DEBUG support, which only x86
supports for now.  The 4th patch adds CONFIG_DMA_API_DEBUG support to IA64
by adding only 8 lines.

This patch:

This header file provides some mapping function definitions that the users
of struct dma_map_ops can use.

Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7bf99fb6

include/asm-generic/dma-mapping-common.h

0 → 100644
+190 −0
Original line number Diff line number Diff line 
#ifndef _ASM_GENERIC_DMA_MAPPING_H

#define _ASM_GENERIC_DMA_MAPPING_H



#include <linux/kmemcheck.h>

#include <linux/scatterlist.h>

#include <linux/dma-debug.h>

#include <linux/dma-attrs.h>



static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,

					      size_t size,

					      enum dma_data_direction dir,

					      struct dma_attrs *attrs)

{

	struct dma_map_ops *ops = get_dma_ops(dev);

	dma_addr_t addr;



	kmemcheck_mark_initialized(ptr, size);

	BUG_ON(!valid_dma_direction(dir));

	addr = ops->map_page(dev, virt_to_page(ptr),

			     (unsigned long)ptr & ~PAGE_MASK, size,

			     dir, attrs);

	debug_dma_map_page(dev, virt_to_page(ptr),

			   (unsigned long)ptr & ~PAGE_MASK, size,

			   dir, addr, true);

	return addr;

}



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

					  size_t size,

					  enum dma_data_direction dir,

					  struct dma_attrs *attrs)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	if (ops->unmap_page)

		ops->unmap_page(dev, addr, size, dir, attrs);

	debug_dma_unmap_page(dev, addr, size, dir, true);

}



static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,

				   int nents, enum dma_data_direction dir,

				   struct dma_attrs *attrs)

{

	struct dma_map_ops *ops = get_dma_ops(dev);

	int i, ents;

	struct scatterlist *s;



	for_each_sg(sg, s, nents, i)

		kmemcheck_mark_initialized(sg_virt(s), s->length);

	BUG_ON(!valid_dma_direction(dir));

	ents = ops->map_sg(dev, sg, nents, dir, attrs);

	debug_dma_map_sg(dev, sg, nents, ents, dir);



	return ents;

}



static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,

				      int nents, enum dma_data_direction dir,

				      struct dma_attrs *attrs)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	debug_dma_unmap_sg(dev, sg, nents, dir);

	if (ops->unmap_sg)

		ops->unmap_sg(dev, sg, nents, dir, attrs);

}



static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,

				      size_t offset, size_t size,

				      enum dma_data_direction dir)

{

	struct dma_map_ops *ops = get_dma_ops(dev);

	dma_addr_t addr;



	kmemcheck_mark_initialized(page_address(page) + offset, size);

	BUG_ON(!valid_dma_direction(dir));

	addr = ops->map_page(dev, page, offset, size, dir, NULL);

	debug_dma_map_page(dev, page, offset, size, dir, addr, false);



	return addr;

}



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

				  size_t size, enum dma_data_direction dir)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	if (ops->unmap_page)

		ops->unmap_page(dev, addr, size, dir, NULL);

	debug_dma_unmap_page(dev, addr, size, dir, false);

}



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

					   size_t size,

					   enum dma_data_direction dir)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	if (ops->sync_single_for_cpu)

		ops->sync_single_for_cpu(dev, addr, size, dir);

	debug_dma_sync_single_for_cpu(dev, addr, size, dir);

	flush_write_buffers();

}



static inline void dma_sync_single_for_device(struct device *dev,

					      dma_addr_t addr, size_t size,

					      enum dma_data_direction dir)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	if (ops->sync_single_for_device)

		ops->sync_single_for_device(dev, addr, size, dir);

	debug_dma_sync_single_for_device(dev, addr, size, dir);

	flush_write_buffers();

}



static inline void dma_sync_single_range_for_cpu(struct device *dev,

						 dma_addr_t addr,

						 unsigned long offset,

						 size_t size,

						 enum dma_data_direction dir)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	if (ops->sync_single_range_for_cpu) {

		ops->sync_single_range_for_cpu(dev, addr, offset, size, dir);

		debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);



		flush_write_buffers();

	} else

		dma_sync_single_for_cpu(dev, addr, size, dir);

}



static inline void dma_sync_single_range_for_device(struct device *dev,

						    dma_addr_t addr,

						    unsigned long offset,

						    size_t size,

						    enum dma_data_direction dir)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	if (ops->sync_single_range_for_device) {

		ops->sync_single_range_for_device(dev, addr, offset, size, dir);

		debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);



		flush_write_buffers();

	} else

		dma_sync_single_for_device(dev, addr, size, dir);

}



static inline void

dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,

		    int nelems, enum dma_data_direction dir)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	if (ops->sync_sg_for_cpu)

		ops->sync_sg_for_cpu(dev, sg, nelems, dir);

	debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);

	flush_write_buffers();

}



static inline void

dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,

		       int nelems, enum dma_data_direction dir)

{

	struct dma_map_ops *ops = get_dma_ops(dev);



	BUG_ON(!valid_dma_direction(dir));

	if (ops->sync_sg_for_device)

		ops->sync_sg_for_device(dev, sg, nelems, dir);

	debug_dma_sync_sg_for_device(dev, sg, nelems, dir);



	flush_write_buffers();

}



#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, NULL)

#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, NULL)

#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, NULL)

#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, NULL)



#endif

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