linux-kernel - Re: [PATCH V6 5/9] virtio-mmio: implement synchronize

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Message-ID: <1653636748.5919-5-xuanzhuo@linux.alibaba.com>
Date:   Fri, 27 May 2022 15:32:28 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     tglx@...utronix.de, peterz@...radead.org, paulmck@...nel.org,
        maz@...nel.org, pasic@...ux.ibm.com, cohuck@...hat.com,
        eperezma@...hat.com, lulu@...hat.com, sgarzare@...hat.com,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        linux-s390@...r.kernel.org, mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 5/9] virtio-mmio: implement synchronize_cbs()

On Fri, 27 May 2022 14:01:16 +0800, Jason Wang <jasowang@...hat.com> wrote:
> Simply synchronize the platform irq that is used by us.
>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: "Paul E. McKenney" <paulmck@...nel.org>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Halil Pasic <pasic@...ux.ibm.com>
> Cc: Cornelia Huck <cohuck@...hat.com>
> Cc: Vineeth Vijayan <vneethv@...ux.ibm.com>
> Cc: Peter Oberparleiter <oberpar@...ux.ibm.com>
> Cc: linux-s390@...r.kernel.org
> Reviewed-by: Cornelia Huck <cohuck@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>

> ---
>  drivers/virtio/virtio_mmio.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 839684d672af..c9699a59f93c 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -345,6 +345,13 @@ static void vm_del_vqs(struct virtio_device *vdev)
>  	free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev);
>  }
>
> +static void vm_synchronize_cbs(struct virtio_device *vdev)
> +{
> +	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
> +
> +	synchronize_irq(platform_get_irq(vm_dev->pdev, 0));
> +}
> +
>  static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int index,
>  				  void (*callback)(struct virtqueue *vq),
>  				  const char *name, bool ctx)
> @@ -541,6 +548,7 @@ static const struct virtio_config_ops virtio_mmio_config_ops = {
>  	.finalize_features = vm_finalize_features,
>  	.bus_name	= vm_bus_name,
>  	.get_shm_region = vm_get_shm_region,
> +	.synchronize_cbs = vm_synchronize_cbs,
>  };
>
>
> --
> 2.25.1
>