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.

Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@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) {

-- 
2.52.0