On 8/21/25 3:59 PM, Vinicius Costa Gomes wrote:
> When the dmaengine "core" asks the driver to synchronize, send a Drain
> operation to the device workqueue, which will wait for the already
> submitted operations to finish.
>
> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
> ---
> drivers/dma/idxd/dma.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c
> index e4f9788aa635..9937b671f637 100644
> --- a/drivers/dma/idxd/dma.c
> +++ b/drivers/dma/idxd/dma.c
> @@ -203,6 +203,13 @@ static int idxd_dma_terminate_all(struct dma_chan *c)
> return 0;
> }
>
> +static void idxd_dma_synchronize(struct dma_chan *c)
> +{
> + struct idxd_wq *wq = to_idxd_wq(c);
> +
> + idxd_wq_drain(wq);
> +}
> +
> int idxd_register_dma_device(struct idxd_device *idxd)
> {
> struct idxd_dma_dev *idxd_dma;
> @@ -234,6 +241,7 @@ int idxd_register_dma_device(struct idxd_device *idxd)
> dma->device_alloc_chan_resources = idxd_dma_alloc_chan_resources;
> dma->device_free_chan_resources = idxd_dma_free_chan_resources;
> dma->device_terminate_all = idxd_dma_terminate_all;
> + dma->device_synchronize = idxd_dma_synchronize;
>
> rc = dma_async_device_register(dma);
> if (rc < 0) {
>