linux-kernel - Re: [PATCH v2 06/10] dmaengine: idxd: Wait for submitted operations on .device

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Message-ID: <2b772882-5797-4fa0-aed1-02ea45b43a75@intel.com>
Date: Thu, 21 Aug 2025 16:14:55 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Vinicius Costa Gomes <vinicius.gomes@...el.com>,
 Vinod Koul <vkoul@...nel.org>, Dan Williams <dan.j.williams@...el.com>,
 Fenghua Yu <fenghuay@...dia.com>
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/10] dmaengine: idxd: Wait for submitted operations
 on .device_synchronize()



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@...el.com>
Reviewed-by: Dave Jiang <dave.jiang@...el.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) {
>