参照元†
- struct ion_client *client
- int fd
返り値†
struct ion_handle *ion_import_dma_buf(struct ion_client *client, int fd)
{
struct dma_buf *dmabuf;
struct ion_buffer *buffer;
struct ion_handle *handle;
int ret;
dmabuf = dma_buf_get(fd);
if (IS_ERR(dmabuf))
return ERR_CAST(dmabuf);
/* if this memory came from ion */
if (dmabuf->ops != &dma_buf_ops) {
pr_err("%s: can not import dmabuf from another exporter\n",
__func__);
dma_buf_put(dmabuf);
return ERR_PTR(-EINVAL);
}
buffer = dmabuf->priv;
mutex_lock(&client->lock);
/* if a handle exists for this buffer just take a reference to it */
handle = ion_handle_lookup(client, buffer);
if (!IS_ERR(handle)) {
ion_handle_get(handle);
mutex_unlock(&client->lock);
goto end;
}
handle = ion_handle_create(client, buffer);
if (IS_ERR(handle)) {
mutex_unlock(&client->lock);
goto end;
}
ret = ion_handle_add(client, handle);
mutex_unlock(&client->lock);
if (ret) {
ion_handle_put(handle);
handle = ERR_PTR(ret);
}
end:
dma_buf_put(dmabuf);
return handle;
}
EXPORT_SYMBOL(ion_import_dma_buf);
コメント†
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