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#include "dma-buf.h"
static inline void io_release_dmabuf(void *priv)
{
struct io_buf_dma *bd = priv;
fput(bd->target_file);
dma_buf_io_ctx_release(bd->ctx);
kfree(bd);
}
int __io_register_dmabuf(struct io_ring_ctx *ctx,
struct io_uring_regbuf_desc *desc,
struct io_mapped_ubuf *imu)
{
struct io_buf_dma *bd = NULL;
struct file *target_file = NULL;
struct dma_buf *dmabuf = NULL;
int ret;
/*
* We have to drop the dma-buf map early when IO is finished. Disable
* IOPOLL for now as we can't wait potentially infintely for a task
* to do that.
*/
if (ctx->flags & IORING_SETUP_IOPOLL)
return -EOPNOTSUPP;
if (desc->uaddr || desc->size)
return -EINVAL;
bd = kzalloc(sizeof(*bd), GFP_KERNEL);
if (!bd)
return -ENOMEM;
target_file = fget(desc->target_fd);
if (!target_file) {
ret = -EBADF;
goto err;
}
dmabuf = dma_buf_get(desc->dmabuf_fd);
if (IS_ERR(dmabuf)) {
ret = PTR_ERR(dmabuf);
dmabuf = NULL;
goto err;
}
ret = io_validate_user_buf_range(0, dmabuf->size);
if (ret)
goto err;
ret = dma_buf_io_ctx_create(target_file, dmabuf, DMA_BIDIRECTIONAL,
&bd->ctx);
if (ret)
goto err;
bd->target_file = target_file;
imu->len = dmabuf->size;
imu->release = io_release_dmabuf;
imu->priv = bd;
imu->flags = IO_REGBUF_F_DMABUF;
imu->dir = IO_BUF_DEST | IO_BUF_SOURCE;
dma_buf_put(dmabuf);
return 0;
err:
kfree(bd);
if (target_file)
fput(target_file);
if (dmabuf)
dma_buf_put(dmabuf);
return ret;
}
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