linux-2.6.33/dmabounce_sync_for_cpu(arm) 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/dmabounce_sync_for_cpu(arm) へ行く。
  • 1 (2011-06-10 (金) 15:38:57)

参照元†

• linux-2.6.33/dmabounce_sync_for_cpu()

説明†

• パス: linux-2.6.33/arch/arm/common/dmabounce.c

• FIXME: これは何？
  • 説明

引数†

• struct device *dev
  • linux-2.6.33/device
• dma_addr_t addr
  • linux-2.6.33/dma_addr_t
• unsigned long off
• size_t sz
• enum dma_data_direction dir
  • linux-2.6.33/dma_data_direction

返り値†

• int

参考†

実装†

int dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr,
		unsigned long off, size_t sz, enum dma_data_direction dir)
{
	struct safe_buffer *buf;

• • linux-2.6.33/safe_buffer

	dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x)\n",
		__func__, addr, off, sz, dir);

• • linux-2.6.33/dev_dbg()

	buf = find_safe_buffer_dev(dev, addr, __func__);
	if (!buf)
		return 1;

• • linux-2.6.33/find_safe_buffer_dev()

	BUG_ON(buf->direction != dir);

• • linux-2.6.33/BUG_ON()

	dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
		__func__, buf->ptr, virt_to_dma(dev, buf->ptr),
		buf->safe, buf->safe_dma_addr);

	DO_STATS(dev->archdata.dmabounce->bounce_count++);

• • linux-2.6.33/DO_STATS

	if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
		dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d\n",
			__func__, buf->safe + off, buf->ptr + off, sz);
		memcpy(buf->ptr + off, buf->safe + off, sz);
	}

• • linux-2.6.33/memcpy()

• linux-2.6.33/DMA_FROM_DEVICE

• • linux-2.6.33/DMA_BIDIRECTIONAL

	return 0;
}
EXPORT_SYMBOL(dmabounce_sync_for_cpu);

• ライセンスに関係なくシンボルを公開する。
  • linux-2.6.33/EXPORT_SYMBOL()

コメント†