On 8/21/25 3:59 PM, Vinicius Costa Gomes wrote:
> When used as a dmaengine, the DMA "core" might ask the driver to
> terminate all pending requests, when that happens, flush all pending
> descriptors.
>
> In this context, flush means removing the requests from the pending
> lists, so even if they are completed after, the user is not notified.
>
> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
> ---
> drivers/dma/idxd/dma.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c
> index dbecd699237e..e4f9788aa635 100644
> --- a/drivers/dma/idxd/dma.c
> +++ b/drivers/dma/idxd/dma.c
> @@ -194,6 +194,15 @@ static void idxd_dma_release(struct dma_device *device)
> kfree(idxd_dma);
> }
>
> +static int idxd_dma_terminate_all(struct dma_chan *c)
> +{
> + struct idxd_wq *wq = to_idxd_wq(c);
> +
> + idxd_wq_flush_descs(wq);
> +
> + return 0;
> +}
> +
> int idxd_register_dma_device(struct idxd_device *idxd)
> {
> struct idxd_dma_dev *idxd_dma;
> @@ -224,6 +233,7 @@ int idxd_register_dma_device(struct idxd_device *idxd)
> dma->device_issue_pending = idxd_dma_issue_pending;
> 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;
>
> rc = dma_async_device_register(dma);
> if (rc < 0) {
>