dma-coherent.c File Reference

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>

Go to the source code of this file.

Data Structures
struct	dma_coherent_mem

Functions
int	dma_declare_coherent_memory (struct device *dev, dma_addr_t bus_addr, dma_addr_t device_addr, size_t size, int flags)
	EXPORT_SYMBOL (dma_declare_coherent_memory)
void	dma_release_declared_memory (struct device *dev)
	EXPORT_SYMBOL (dma_release_declared_memory)
void *	dma_mark_declared_memory_occupied (struct device *dev, dma_addr_t device_addr, size_t size)
	EXPORT_SYMBOL (dma_mark_declared_memory_occupied)
int	dma_alloc_from_coherent (struct device *dev, ssize_t size, dma_addr_t *dma_handle, void **ret)
	EXPORT_SYMBOL (dma_alloc_from_coherent)
int	dma_release_from_coherent (struct device *dev, int order, void *vaddr)
	EXPORT_SYMBOL (dma_release_from_coherent)
int	dma_mmap_from_coherent (struct device *dev, struct vm_area_struct *vma, void *vaddr, size_t size, int *ret)
	EXPORT_SYMBOL (dma_mmap_from_coherent)

Function Documentation

int dma_alloc_from_coherent	(	struct device *	dev,
		ssize_t	size,
		dma_addr_t *	dma_handle,
		void **	ret
	)

dma_alloc_from_coherent() - try to allocate memory from the per-device coherent area

: device from which we allocate memory : size of requested memory area : This will be filled with the correct dma handle : This pointer will be filled with the virtual address to allocated area.

This function should be only called from per-arch dma_alloc_coherent() to support allocation from per-device coherent memory pools.

Returns 0 if dma_alloc_coherent should continue with allocating from generic memory areas, or !0 if dma_alloc_coherent should return .

Definition at line 113 of file dma-coherent.c.

int dma_declare_coherent_memory	(	struct device *	dev,
		dma_addr_t	bus_addr,
		dma_addr_t	device_addr,
		size_t	size,
		int	flags
	)

Definition at line 19 of file dma-coherent.c.

void* dma_mark_declared_memory_occupied	(	struct device *	dev,
		dma_addr_t	device_addr,
		size_t	size
	)

Definition at line 79 of file dma-coherent.c.

int dma_mmap_from_coherent	(	struct device *	dev,
		struct vm_area_struct *	vma,
		void *	vaddr,
		size_t	size,
		int *	ret
	)

dma_mmap_from_coherent() - try to mmap the memory allocated from per-device coherent memory pool to userspace : device from which the memory was allocated : vm_area for the userspace memory : cpu address returned by dma_alloc_from_coherent : size of the memory buffer allocated by dma_alloc_from_coherent : result from remap_pfn_range()

This checks whether the memory was allocated from the per-device coherent memory pool and if so, maps that memory to the provided vma.

Returns 1 if we correctly mapped the memory, or 0 if the caller should proceed with mapping memory from generic pools.

Definition at line 197 of file dma-coherent.c.

void dma_release_declared_memory

(

struct device *

dev

)

Definition at line 66 of file dma-coherent.c.

int dma_release_from_coherent	(	struct device *	dev,
		int	order,
		void *	vaddr
	)

dma_release_from_coherent() - try to free the memory allocated from per-device coherent memory pool : device from which the memory was allocated : the order of pages allocated : virtual address of allocated pages

This checks whether the memory was allocated from the per-device coherent memory pool and if so, releases that memory.

Returns 1 if we correctly released the memory, or 0 if dma_release_coherent() should proceed with releasing memory from generic pools.

Definition at line 167 of file dma-coherent.c.

EXPORT_SYMBOL

(

dma_declare_coherent_memory

)

EXPORT_SYMBOL

(

dma_release_declared_memory

)

EXPORT_SYMBOL

(

dma_mark_declared_memory_occupied

)

EXPORT_SYMBOL

(

dma_alloc_from_coherent

)

EXPORT_SYMBOL

(

dma_release_from_coherent

)

EXPORT_SYMBOL

(

dma_mmap_from_coherent

)