linux-kernel - RE: [PATCH 2/5] vdpa: introduce get_vq_dma

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Message-ID: <DM8PR12MB540083D857A5FEF984AC0C4CABC09@DM8PR12MB5400.namprd12.prod.outlook.com>
Date:   Sun, 15 Jan 2023 11:06:30 +0000
From:   Eli Cohen <elic@...dia.com>
To:     Jason Wang <jasowang@...hat.com>, "mst@...hat.com" <mst@...hat.com>
CC:     "gdawar@....com" <gdawar@....com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tanuj.kamde@....com" <tanuj.kamde@....com>
Subject: RE: [PATCH 2/5] vdpa: introduce get_vq_dma_device()

> From: Jason Wang <jasowang@...hat.com>
> Sent: Wednesday, 11 January 2023 8:28
> To: mst@...hat.com; jasowang@...hat.com
> Cc: Eli Cohen <elic@...dia.com>; gdawar@....com;
> virtualization@...ts.linux-foundation.org; linux-kernel@...r.kernel.org;
> tanuj.kamde@....com
> Subject: [PATCH 2/5] vdpa: introduce get_vq_dma_device()
> 
> This patch introduces a new method to query the dma device that is use
> for a specific virtqueue.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>
Reviewed-by: Eli Cohen <elic@...dia.com>
Tested-by: <elic@...dia.com>
> ---
>  include/linux/vdpa.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 6d0f5e4e82c2..3ec13aee35f5 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -282,6 +282,11 @@ struct vdpa_map_file {
>   *				@iova: iova to be unmapped
>   *				@size: size of the area
>   *				Returns integer: success (0) or error (< 0)
> + * @get_vq_dma_dev:		Get the dma device for a specific
> + *				virtqueue (optional)
> + *				@vdev: vdpa device
> + *				@idx: virtqueue index
> + *				Returns pointer to structure device or error
> (NULL)
>   * @free:			Free resources that belongs to vDPA
> (optional)
>   *				@vdev: vdpa device
>   */
> @@ -341,6 +346,7 @@ struct vdpa_config_ops {
>  			 u64 iova, u64 size);
>  	int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
>  			      unsigned int asid);
> +	struct device *(*get_vq_dma_dev)(struct vdpa_device *vdev, u16 idx);
> 
>  	/* Free device resources */
>  	void (*free)(struct vdpa_device *vdev);
> --
> 2.25.1