[PATCH v2] dma-mapping: Provide write-combine allocations
From: Thierry Reding <hidden>
Date: 2014-06-27 09:57:05
From: Thierry Reding <redacted>
Provide an implementation for dma_{alloc,free,mmap}_writecombine() when
the architecture supports DMA attributes.
Signed-off-by: Thierry Reding <redacted>
---
Changes in v2:
- Add a generic dma_mmap_writecombine() function
arch/arm/include/asm/dma-mapping.h | 16 ----------------
include/asm-generic/dma-mapping-common.h | 8 --------
include/linux/dma-mapping.h | 26 ++++++++++++++++++++++++++
3 files changed, 26 insertions(+), 24 deletions(-)
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index c45b61a4b4a5..85738b200023 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h@@ -265,22 +265,6 @@ extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs); -static inline void *dma_alloc_writecombine(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - DEFINE_DMA_ATTRS(attrs); - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); - return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs); -} - -static inline void dma_free_writecombine(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t dma_handle) -{ - DEFINE_DMA_ATTRS(attrs); - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); - return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs); -} - /* * This can be called during early boot to increase the size of the atomic * coherent DMA pool above the default value of 256KiB. It must be called
diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h
index de8bf89940f8..d137431bf26f 100644
--- a/include/asm-generic/dma-mapping-common.h
+++ b/include/asm-generic/dma-mapping-common.h@@ -205,14 +205,6 @@ dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL) -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); -} - int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size);
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
--
2.0.0