On Mon, Dec 13, 2021 at 05:00:08PM +0100, Mikhail Golubev wrote: > From: Yurii Danilovskyi <[email protected]> > > 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 <[email protected]> > Signed-off-by: Mikhail Golubev <[email protected]> > --- > 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 > > > -- _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
