On Mon, Dec 13, 2021 at 05:00:08PM +0100, Mikhail Golubev wrote:
> From: Yurii Danilovskyi <glyd@xxxxxxxxxxxxxxx>
>
> Handle restore and freeze notifications from the PM core. Expose
> these to individual virtio drivers that can quiesce and resume vq
> operations.
>
> Signed-off-by: Yurii Danilovskyi <glyd@xxxxxxxxxxxxxxx>
> Signed-off-by: Mikhail Golubev <Mikhail.Golubev@xxxxxxxxxxxxxxx>
> ---
> drivers/virtio/virtio_mmio.c | 19 +++++++++++++++++++
> 1 file changed, 19 insertions(+)
>
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 56128b9c46eb..af79f8c2a2f2 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -762,6 +762,24 @@ static void vm_unregister_cmdline_devices(void)
>
> #endif
>
> +static int __maybe_unused virtio_mmio_freeze(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);
> +
> + return virtio_device_freeze(&vm_dev->vdev);
> +}
> +
> +static int __maybe_unused virtio_mmio_restore(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);
> +
> + return virtio_device_restore(&vm_dev->vdev);
> +}
> +
> +static SIMPLE_DEV_PM_OPS(virtio_mmio_pm_ops, virtio_mmio_freeze, virtio_mmio_restore);
> +
> /* Platform driver */
>
> static const struct of_device_id virtio_mmio_match[] = {
> @@ -785,6 +803,7 @@ static struct platform_driver virtio_mmio_driver = {
> .name = "virtio-mmio",
> .of_match_table = virtio_mmio_match,
> .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match),
> + .pm = &virtio_mmio_pm_ops,
> },
> };
All this code needs to be within ifdef CONFIG_PM_SLEEP. Alternatively,
tweak virtio.h to expose virtio_device_freeze/virtio_device_restore
unconditionally.
>
> --
> 2.34.1
>
>
> --
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