参照元

説明

引数

返り値

参考

実装

CONFIG_DMABOUNCE 有効時: linux-2.6.33/arch/arm/common/dmabounce.c

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;
	dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x)\n",
		__func__, addr, off, sz, dir);
	buf = find_safe_buffer_dev(dev, addr, __func__);
	if (!buf)
		return 1;
	BUG_ON(buf->direction != dir);
	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++);
	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);
	}
	return 0;
}
EXPORT_SYMBOL(dmabounce_sync_for_cpu);

CONFIG_DMABOUNCE 無効時: linux-2.6.33/arch/arm/include/asm/dma-mapping.h

static inline int dmabounce_sync_for_cpu(struct device *d, dma_addr_t addr,
	unsigned long offset, size_t size, enum dma_data_direction dir)
{
	return 1;
}

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Last-modified: 2014-09-13 (土) 08:26:41