linux-4.4.1/dma_buf_map_attachment()

参照元†

• linux-4.4.1/vb2_dc_map_dmabuf()
• linux-4.4/DMA_buffer

説明†

• パス: linux-4.4.1/drivers/dma-buf/dma-buf.c

• FIXME: これは何？
  • 説明

引数†

• struct dma_buf_attachment *attach
  • linux-4.4.1/dma_buf_attachment
• enum dma_data_direction direction
  • linux-4.4.1/dma_data_direction

返り値†

• struct sg_table *
  • linux-4.4.1/sg_table

参考†

実装†

/**
 * dma_buf_map_attachment - Returns the scatterlist table of the attachment;
 * mapped into _device_ address space. Is a wrapper for map_dma_buf() of the
 * dma_buf_ops.
 * @attach:     [in]    attachment whose scatterlist is to be returned
 * @direction:  [in]    direction of DMA transfer
 *
 * Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
 * on error.
 */
struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,
                                        enum dma_data_direction direction)
{
        struct sg_table *sg_table = ERR_PTR(-EINVAL);

• • linux-4.4.1/ERR_PTR()

        might_sleep();

• • linux-4.4.1/might_sleep()

        if (WARN_ON(!attach || !attach->dmabuf))
                return ERR_PTR(-EINVAL);

• • linux-4.4.1/WARN_ON()

        sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
        if (!sg_table)
                sg_table = ERR_PTR(-ENOMEM);

• • attach->dmabuf は struct dma_buf * 型
  • linux-4.4.1/dma_buf
  • attach->dmabuf->ops は const struct dma_buf_ops * 型
  • linux-4.4.1/dma_buf_ops

        return sg_table;
}
EXPORT_SYMBOL_GPL(dma_buf_map_attachment);

• • linux-4.4.1/EXPORT_SYMBOL_GPL()

コメント†

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• katsuhiro

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