linux-4.4.1/arm_dma_unmap_page() 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/arm_dma_unmap_page() へ行く。
• linux-4.4.1/arm_dma_unmap_page() の差分を削除

*参照元 [#p72d3973]
#backlinks

*説明 [#d1344133]
-パス: [[linux-4.4.1/arch/arm/mm/dma-mapping.c]]

-FIXME: これは何？
--説明


**引数 [#yca18d6f]
-struct device *dev
--
--[[linux-4.4.1/device]]
-dma_addr_t handle
--
--[[linux-4.4.1/dma_addr_t]]
-size_t size
--
-enum dma_data_direction dir
--
--[[linux-4.4.1/dma_data_direction]]
-struct dma_attrs *attrs
--
--[[linux-4.4.1/dma_attrs]]


**返り値 [#r0c98d57]
-なし


**参考 [#u23c5cc6]


*実装 [#d9f6b930]
 /**
  * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @handle: DMA address of buffer
  * @size: size of buffer (same as passed to dma_map_page)
  * @dir: DMA transfer direction (same as passed to dma_map_page)
  *
  * Unmap a page streaming mode DMA translation.  The handle and size
  * must match what was provided in the previous dma_map_page() call.
  * All other usages are undefined.
  *
  * After this call, reads by the CPU to the buffer are guaranteed to see
  * whatever the device wrote there.
  */
 static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle,
                 size_t size, enum dma_data_direction dir,
                 struct dma_attrs *attrs)
 {
         if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
-
--[[linux-4.4.1/dma_get_attr()]]

                 __dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)),
                                       handle & ~PAGE_MASK, size, dir);
-
--[[linux-4.4.1/__dma_page_dev_to_cpu()]]
--[[linux-4.4.1/pfn_to_page()]]
--[[linux-4.4.1/dma_to_pfn()]]

 }


*コメント [#z8fafdd6]