linux-4.4.1/dma_mmap_attrs() の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-4.4.1/dma_mmap_attrs() へ行く。
• linux-4.4.1/dma_mmap_attrs() の差分を削除

*参照元 [#dec73efa]
#backlinks

*説明 [#zb4e217f]
-パス: [[linux-4.4.1/include/asm-generic/dma-mapping-common.h]]

-FIXME: これは何？
--説明


**引数 [#e604a737]
-struct device *dev
--
--[[linux-4.4.1/device]]
-struct vm_area_struct *vma
--
--[[linux-4.4.1/vm_area_struct]]
-void *cpu_addr
--
-dma_addr_t dma_addr
--
--[[linux-4.4.1/dma_addr_t]]
-size_t size
--
-struct dma_attrs *attrs
--
--[[linux-4.4.1/dma_attrs]]


**返り値 [#bf91f8a0]
-int
--


**参考 [#s4ff04b1]


*実装 [#jf5874bc]
 /**
  * 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, struct dma_attrs *attrs)
 {
         struct dma_map_ops *ops = get_dma_ops(dev);
-
--[[linux-4.4.1/dma_map_ops]]
--[[linux-4.4.1/get_dma_ops()]]

         BUG_ON(!ops);
-
--[[linux-4.4.1/BUG_ON()]]

         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);
-
--[[linux-4.4.1/dma_common_mmap()]]

 }


*コメント [#k179134a]