mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 05:34:13 +08:00
64ccc9c033
Commit 9adc5374 ('common: dma-mapping: introduce mmap method') added a
generic method for implementing mmap user call to dma_map_ops structure.
This patch converts ARM and PowerPC architectures (the only providers of
dma_mmap_coherent/dma_mmap_writecombine calls) to use this generic
dma_map_ops based call and adds a generic cross architecture
definition for dma_mmap_attrs, dma_mmap_coherent, dma_mmap_writecombine
functions.
The generic mmap virt_to_page-based fallback implementation is provided for
architectures which don't provide their own implementation for mmap method.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
36 lines
1.1 KiB
C
36 lines
1.1 KiB
C
#ifndef DMA_COHERENT_H
|
|
#define DMA_COHERENT_H
|
|
|
|
#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);
|
|
/*
|
|
* Standard interface
|
|
*/
|
|
#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
|
|
extern int
|
|
dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
|
|
dma_addr_t device_addr, size_t size, int flags);
|
|
|
|
extern void
|
|
dma_release_declared_memory(struct device *dev);
|
|
|
|
extern void *
|
|
dma_mark_declared_memory_occupied(struct device *dev,
|
|
dma_addr_t device_addr, size_t size);
|
|
#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
|
|
|
|
#endif
|