linux-4.4.1/dma_buf_attach() の履歴(No.2)

• 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/dma_buf_attach() へ行く。
  • 1 (2016-02-08 (月) 11:32:06)
  • 2 (2016-02-08 (月) 11:47:18)
  • 3 (2016-02-08 (月) 17:12:42)
  • 4 (2016-02-26 (金) 11:54:17)

参照元†

• linux-4.4.1/vb2_dc_attach_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 *dmabuf
  • linux-4.4.1/dma_buf
• struct device *dev
  • linux-4.4.1/device

返り値†

• struct dma_buf_attachment *

参考†

実装†

/**
 * dma_buf_attach - Add the device to dma_buf's attachments list; optionally,
 * calls attach() of dma_buf_ops to allow device-specific attach functionality
 * @dmabuf:     [in]    buffer to attach device to.
 * @dev:        [in]    device to be attached.
 *
 * Returns struct dma_buf_attachment * for this attachment; returns ERR_PTR on
 * error.
 */
struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
                                          struct device *dev)
{
        struct dma_buf_attachment *attach;
        int ret;

• • linux-4.4.1/dma_buf_attachment

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

• • linux-4.4.1/WARN_ON()
  • linux-4.4.1/ERR_PTR()

        attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL);
        if (attach == NULL)
                return ERR_PTR(-ENOMEM);

• • linux-4.4.1/kzalloc()

        attach->dev = dev;
        attach->dmabuf = dmabuf;

        mutex_lock(&dmabuf->lock);

• • linux-4.4.1/mutex_lock()

        if (dmabuf->ops->attach) {
                ret = dmabuf->ops->attach(dmabuf, dev, attach);
                if (ret)
                        goto err_attach;
        }
        list_add(&attach->node, &dmabuf->attachments);

• • dmabuf->ops は struct dma_buf_ops 型
  • linux-4.4.1/dma_buf_ops
  • linux-4.4.1/list_add()

        mutex_unlock(&dmabuf->lock);
        return attach;

• • linux-4.4.1/mutex_unlock()

err_attach:
        kfree(attach);
        mutex_unlock(&dmabuf->lock);
        return ERR_PTR(ret);

• • linux-4.4.1/kfree()

}
EXPORT_SYMBOL_GPL(dma_buf_attach);

• • linux-4.4.1/EXPORT_SYMBOL_GPL()

コメント†