diff options
| author | Thierry Reding <treding@nvidia.com> | 2014-06-27 13:56:58 +0400 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2014-08-26 09:39:13 +0400 |
| commit | b4bbb107d73bbc0d92c9ae7fd8e69580aa9381e7 (patch) | |
| tree | c631cccdc40abe3d44fc980a739fb20ec4354d3f /include/linux/dma-mapping.h | |
| parent | 90114d65feea716eeae0ab51e92c95b140b2e6fc (diff) | |
| download | linux-b4bbb107d73bbc0d92c9ae7fd8e69580aa9381e7.tar.xz | |
dma-mapping: Provide write-combine allocations
Provide an implementation for dma_{alloc,free,mmap}_writecombine() when
the architecture supports DMA attributes.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'include/linux/dma-mapping.h')
| -rw-r--r-- | include/linux/dma-mapping.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 931b70986272..d5d388160f42 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -263,6 +263,32 @@ struct dma_attrs; #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ dma_unmap_sg(dev, sgl, nents, dir) +#else +static inline void *dma_alloc_writecombine(struct device *dev, size_t size, + dma_addr_t *dma_addr, gfp_t gfp) +{ + DEFINE_DMA_ATTRS(attrs); + dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); + return dma_alloc_attrs(dev, size, dma_addr, gfp, &attrs); +} + +static inline void dma_free_writecombine(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_addr) +{ + DEFINE_DMA_ATTRS(attrs); + dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); + return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs); +} + +static inline int dma_mmap_writecombine(struct device *dev, + struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, + size_t size) +{ + DEFINE_DMA_ATTRS(attrs); + dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); + return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs); +} #endif /* CONFIG_HAVE_DMA_ATTRS */ #ifdef CONFIG_NEED_DMA_MAP_STATE |