Release 4.12 include/linux/dma-mapping.h

#ifndef _LINUX_DMA_MAPPING_H

#define _LINUX_DMA_MAPPING_H

#include <linux/sizes.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/dma-debug.h>
#include <linux/dma-direction.h>
#include <linux/scatterlist.h>
#include <linux/kmemcheck.h>
#include <linux/bug.h>

/**
 * List of possible attributes associated with a DMA mapping. The semantics
 * of each attribute should be defined in Documentation/DMA-attributes.txt.
 *
 * DMA_ATTR_WRITE_BARRIER: DMA to a memory region with this attribute
 * forces all pending DMA writes to complete.
 */

#define DMA_ATTR_WRITE_BARRIER		(1UL << 0)
/*
 * DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
 * may be weakly ordered, that is that reads and writes may pass each other.
 */

#define DMA_ATTR_WEAK_ORDERING		(1UL << 1)
/*
 * DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
 * buffered to improve performance.
 */

#define DMA_ATTR_WRITE_COMBINE		(1UL << 2)
/*
 * DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
 * consistent or non-consistent memory as it sees fit.
 */

#define DMA_ATTR_NON_CONSISTENT		(1UL << 3)
/*
 * DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
 * virtual mapping for the allocated buffer.
 */

#define DMA_ATTR_NO_KERNEL_MAPPING	(1UL << 4)
/*
 * DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
 * the CPU cache for the given buffer assuming that it has been already
 * transferred to 'device' domain.
 */

#define DMA_ATTR_SKIP_CPU_SYNC		(1UL << 5)
/*
 * DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
 * in physical memory.
 */

#define DMA_ATTR_FORCE_CONTIGUOUS	(1UL << 6)
/*
 * DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
 * that it's probably not worth the time to try to allocate memory to in a way
 * that gives better TLB efficiency.
 */

#define DMA_ATTR_ALLOC_SINGLE_PAGES	(1UL << 7)
/*
 * DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
 * allocation failure reports (similarly to __GFP_NOWARN).
 */

#define DMA_ATTR_NO_WARN	(1UL << 8)

/*
 * DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully
 * accessible at an elevated privilege level (and ideally inaccessible or
 * at least read-only at lesser-privileged levels).
 */

#define DMA_ATTR_PRIVILEGED		(1UL << 9)

/*
 * A dma_addr_t can hold any valid DMA or bus address for the platform.
 * It can be given to a device to use as a DMA source or target.  A CPU cannot
 * reference a dma_addr_t directly because there may be translation between
 * its physical address space and the bus address space.
 */

struct dma_map_ops {
	
void* (*alloc)(struct device *dev, size_t size,
				dma_addr_t *dma_handle, gfp_t gfp,
				unsigned long attrs);
	
void (*free)(struct device *dev, size_t size,
			      void *vaddr, dma_addr_t dma_handle,
			      unsigned long attrs);
	
int (*mmap)(struct device *, struct vm_area_struct *,
			  void *, dma_addr_t, size_t,
			  unsigned long attrs);

	
int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
			   dma_addr_t, size_t, unsigned long attrs);

	
dma_addr_t (*map_page)(struct device *dev, struct page *page,
			       unsigned long offset, size_t size,
			       enum dma_data_direction dir,
			       unsigned long attrs);
	
void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
			   size_t size, enum dma_data_direction dir,
			   unsigned long attrs);
	/*
         * map_sg returns 0 on error and a value > 0 on success.
         * It should never return a value < 0.
         */
	
int (*map_sg)(struct device *dev, struct scatterlist *sg,
		      int nents, enum dma_data_direction dir,
		      unsigned long attrs);
	
void (*unmap_sg)(struct device *dev,
			 struct scatterlist *sg, int nents,
			 enum dma_data_direction dir,
			 unsigned long attrs);
	
dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
			       size_t size, enum dma_data_direction dir,
			       unsigned long attrs);
	
void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
			   size_t size, enum dma_data_direction dir,
			   unsigned long attrs);
	
void (*sync_single_for_cpu)(struct device *dev,
				    dma_addr_t dma_handle, size_t size,
				    enum dma_data_direction dir);
	
void (*sync_single_for_device)(struct device *dev,
				       dma_addr_t dma_handle, size_t size,
				       enum dma_data_direction dir);
	
void (*sync_sg_for_cpu)(struct device *dev,
				struct scatterlist *sg, int nents,
				enum dma_data_direction dir);
	
void (*sync_sg_for_device)(struct device *dev,
				   struct scatterlist *sg, int nents,
				   enum dma_data_direction dir);
	
int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
	
int (*dma_supported)(struct device *dev, u64 mask);
	
int (*set_dma_mask)(struct device *dev, u64 mask);
#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
	
u64 (*get_required_mask)(struct device *dev);
#endif
	
int is_phys;
};

extern const struct dma_map_ops dma_noop_ops;
extern const struct dma_map_ops dma_virt_ops;


#define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))


#define DMA_MASK_NONE	0x0ULL



static inline int valid_dma_direction(int dma_direction)
{
	return ((dma_direction == DMA_BIDIRECTIONAL) ||
		(dma_direction == DMA_TO_DEVICE) ||
		(dma_direction == DMA_FROM_DEVICE));
}

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static inline int is_device_dma_capable(struct device *dev)
{
	return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
}

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#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
/*
 * These three functions are only for dma allocator.
 * Don't use them in device drivers.
 */
int dma_alloc_from_coherent(struct device *dev, ssize_t size,
				       dma_addr_t *dma_handle, void **ret);
int dma_release_from_coherent(struct device *dev, int order, void *vaddr);

int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
			    void *cpu_addr, size_t size, int *ret);
#else

#define dma_alloc_from_coherent(dev, size, handle, ret) (0)

#define dma_release_from_coherent(dev, order, vaddr) (0)

#define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */

#ifdef CONFIG_HAS_DMA
#include <asm/dma-mapping.h>


static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
{
	if (dev && dev->dma_ops)
		return dev->dma_ops;
	return get_arch_dma_ops(dev ? dev->bus : NULL);
}

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static inline void set_dma_ops(struct device *dev,
			       const struct dma_map_ops *dma_ops)
{
	dev->dma_ops = dma_ops;
}
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#else
/*
 * Define the dma api to allow compilation but not linking of
 * dma dependent code.  Code that depends on the dma-mapping
 * API needs to set 'depends on HAS_DMA' in its Kconfig
 */
extern const struct dma_map_ops bad_dma_ops;


static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
{
	return &bad_dma_ops;
}
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#endif



static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
					      size_t size,
					      enum dma_data_direction dir,
					      unsigned long attrs)
{
	const 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),
			     offset_in_page(ptr), size,
			     dir, attrs);
	debug_dma_map_page(dev, virt_to_page(ptr),
			   offset_in_page(ptr), size,
			   dir, addr, true);
	return addr;
}

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static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
					  size_t size,
					  enum dma_data_direction dir,
					  unsigned long attrs)
{
	const 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);
}

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/*
 * dma_maps_sg_attrs returns 0 on error and > 0 on success.
 * It should never return a value < 0.
 */


static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
				   int nents, enum dma_data_direction dir,
				   unsigned long attrs)
{
	const 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);
	BUG_ON(ents < 0);
	debug_dma_map_sg(dev, sg, nents, ents, dir);

	return ents;
}

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static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
				      int nents, enum dma_data_direction dir,
				      unsigned long attrs)
{
	const 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);
}

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static inline dma_addr_t dma_map_page_attrs(struct device *dev,
					    struct page *page,
					    size_t offset, size_t size,
					    enum dma_data_direction dir,
					    unsigned long attrs)
{
	const 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, attrs);
	debug_dma_map_page(dev, page, offset, size, dir, addr, false);

	return addr;
}

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static inline void dma_unmap_page_attrs(struct device *dev,
					dma_addr_t addr, size_t size,
					enum dma_data_direction dir,
					unsigned long attrs)
{
	const 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, false);
}

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static inline dma_addr_t dma_map_resource(struct device *dev,
					  phys_addr_t phys_addr,
					  size_t size,
					  enum dma_data_direction dir,
					  unsigned long attrs)
{
	const struct dma_map_ops *ops = get_dma_ops(dev);
	dma_addr_t addr;

	BUG_ON(!valid_dma_direction(dir));

	/* Don't allow RAM to be mapped */
	BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));

	addr = phys_addr;
	if (ops->map_resource)
		addr = ops->map_resource(dev, phys_addr, size, dir, attrs);

	debug_dma_map_resource(dev, phys_addr, size, dir, addr);

	return addr;
}

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static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
				      size_t size, enum dma_data_direction dir,
				      unsigned long attrs)
{
	const struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!valid_dma_direction(dir));
	if (ops->unmap_resource)
		ops->unmap_resource(dev, addr, size, dir, attrs);
	debug_dma_unmap_resource(dev, addr, size, dir);
}

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static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
					   size_t size,
					   enum dma_data_direction dir)
{
	const 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);
}

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static inline void dma_sync_single_for_device(struct device *dev,
					      dma_addr_t addr, size_t size,
					      enum dma_data_direction dir)
{
	const 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);
}

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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)
{
	const 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 + offset, size, dir);
	debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
}

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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)
{
	const 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 + offset, size, dir);
	debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
}

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static inline void

dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
		    int nelems, enum dma_data_direction dir)
{
	const 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);
}

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static inline void

dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
		       int nelems, enum dma_data_direction dir)
{
	const 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);

}

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#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)

#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)

#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)

#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)

#define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)

#define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)

extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
			   void *cpu_addr, dma_addr_t dma_addr, size_t size);

void *dma_common_contiguous_remap(struct page *page, size_t size,
			unsigned long vm_flags,
			pgprot_t prot, const void *caller);

void *dma_common_pages_remap(struct page **pages, size_t size,
			unsigned long vm_flags, pgprot_t prot,
			const void *caller);
void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);

/**
 * dma_mmap_attrs - map a coherent DMA allocation into user space
 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 * @vma: vm_area_struct describing requested user mapping
 * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 * @handle: device-view address returned from dma_alloc_attrs
 * @size: size of memory originally requested in dma_alloc_attrs
 * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 *
 * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 * into user space.  The coherent DMA buffer must not be freed by the
 * driver until the user space mapping has been released.
 */

static inline int

dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
	       dma_addr_t dma_addr, size_t size, unsigned long attrs)
{
	const struct dma_map_ops *ops = get_dma_ops(dev);
	BUG_ON(!ops);
	if (ops->mmap)
		return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
	return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}

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#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)

int
dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
		       void *cpu_addr, dma_addr_t dma_addr, size_t size);


static inline int

dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
		      dma_addr_t dma_addr, size_t size,
		      unsigned long attrs)
{
	const struct dma_map_ops *ops = get_dma_ops(dev);
	BUG_ON(!ops);
	if (ops->get_sgtable)
		return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
					attrs);
	return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
}

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#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)

#ifndef arch_dma_alloc_attrs

#define arch_dma_alloc_attrs(dev, flag)	(true)
#endif



static inline void *dma_alloc_attrs(struct device *dev, size_t size,
				       dma_addr_t *dma_handle, gfp_t flag,
				       unsigned long attrs)
{
	const struct dma_map_ops *ops = get_dma_ops(dev);
	void *cpu_addr;

	BUG_ON(!ops);

	if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr))
		return cpu_addr;

	if (!arch_dma_alloc_attrs(&dev, &flag))
		return NULL;
	if (!ops->alloc)
		return NULL;

	cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
	debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
	return cpu_addr;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
119
97.54%
1
33.33%
Krzysztof Kozlowski
2
1.64%
1
33.33%
Bart Van Assche
1
0.82%
1
33.33%
Total
122
100.00%
3
100.00%



static inline void dma_free_attrs(struct device *dev, size_t size,
				     void *cpu_addr, dma_addr_t dma_handle,
				     unsigned long attrs)
{
	const struct dma_map_ops *ops = get_dma_ops(dev);

	BUG_ON(!ops);
	WARN_ON(irqs_disabled());

	if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
		return;

	if (!ops->free || !cpu_addr)
		return;

	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
	ops->free(dev, size, cpu_addr, dma_handle, attrs);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
95
94.06%
1
25.00%
Zhen Lei
3
2.97%
1
25.00%
Krzysztof Kozlowski
2
1.98%
1
25.00%
Bart Van Assche
1
0.99%
1
25.00%
Total
101
100.00%
4
100.00%



static inline void *dma_alloc_coherent(struct device