linux-4.4.1/arm_dma_sync_sg_for_device() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/arm_dma_sync_sg_for_device() へ行く。
  • 1 (2016-03-10 (木) 13:50:24)
  • 2 (2016-03-10 (木) 13:50:52)

参照元†

• linux-4.4.1/arm_dma_ops(global)

説明†

• パス: [[linux-4.4.1/]]

• FIXME: これは何？
  • 説明

引数†

• struct device *dev
  • linux-4.4.1/device
• struct scatterlist *sg
  • linux-4.4.1/scatterlist
• int nents
• enum dma_data_direction dir
  • linux-4.4.1/dma_data_direction

返り値†

• なし

参考†

実装†

 /**
  * arm_dma_sync_sg_for_device
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
  * @sg: list of buffers
  * @nents: number of buffers to map (returned from dma_map_sg)
  * @dir: DMA transfer direction (same as was passed to dma_map_sg)
  */
 void arm_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
                         int nents, enum dma_data_direction dir)
 {
         struct dma_map_ops *ops = get_dma_ops(dev);
         struct scatterlist *s;
         int i;
 

• • linux-4.4.1/dma_map_ops
  • linux-4.4.1/get_dma_ops()

         for_each_sg(sg, s, nents, i)
                 ops->sync_single_for_device(dev, sg_dma_address(s), s->length,
                                             dir);

• • linux-4.4.1/for_each_sg()
  • linux-4.4.1/sg_dma_address()

 }

コメント†