linux-2.6.33/dma_sync_single_range_for_cpu() 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-2.6.33/dma_sync_single_range_for_cpu() へ行く。
  • 1 (2011-06-10 (金) 15:21:01)

参照元†

• linux-2.6.33/dma_sync_single_for_cpu(arm)

説明†

• パス: [[linux-2.6.33/]]

• FIXME: これは何？
  • 説明

引数†

• struct device *dev
  • linux-2.6.33/device
• dma_addr_t handle
  • linux-2.6.33/dma_addr_t
• unsigned long offset
• size_t size
• enum dma_data_direction dir
  • linux-2.6.33/dma_data_direction

返り値†

• なし

参考†

実装†

/**
 * dma_sync_single_range_for_cpu
 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 * @handle: DMA address of buffer
 * @offset: offset of region to start sync
 * @size: size of region to sync
 * @dir: DMA transfer direction (same as passed to dma_map_single)
 *
 * Make physical memory consistent for a single streaming mode DMA
 * translation after a transfer.
 *
 * If you perform a dma_map_single() but wish to interrogate the
 * buffer using the cpu, yet do not wish to teardown the PCI dma
 * mapping, you must call this function before doing so.  At the
 * next point you give the PCI dma address back to the card, you
 * must first the perform a dma_sync_for_device, and then the
 * device again owns the buffer.
 */
static inline void dma_sync_single_range_for_cpu(struct device *dev,
		dma_addr_t handle, unsigned long offset, size_t size,
		enum dma_data_direction dir)
{
	BUG_ON(!valid_dma_direction(dir));

• • linux-2.6.33/valid_dma_direction()

• linux-2.6.33/BUG_ON()

	dmabounce_sync_for_cpu(dev, handle, offset, size, dir);

• • linux-2.6.33/dmabounce_sync_for_cpu()

}

コメント†