Commit 76f0d870 authored by Philip Chen's avatar Philip Chen Committed by Michael S. Tsirkin
Browse files

virtio_pmem: Add freeze/restore callbacks 



Add basic freeze/restore PM callbacks to support hibernation (S4):
- On freeze, delete vq and quiesce the device to prepare for
  snapshotting.
- On restore, re-init vq and mark DRIVER_OK.

Signed-off-by: default avatarPhilip Chen <philipchen@chromium.org>
Message-Id: <20240815004617.2325269-1-philipchen@chromium.org>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 35025963

drivers/nvdimm/virtio_pmem.c

+24 −0
Original line number Diff line number Diff line
@@ -143,6 +143,28 @@ static void virtio_pmem_remove(struct virtio_device *vdev) 
	virtio_reset_device(vdev);

}



static int virtio_pmem_freeze(struct virtio_device *vdev)

{

	vdev->config->del_vqs(vdev);

	virtio_reset_device(vdev);



	return 0;

}



static int virtio_pmem_restore(struct virtio_device *vdev)

{

	int ret;



	ret = init_vq(vdev->priv);

	if (ret) {

		dev_err(&vdev->dev, "failed to initialize virtio pmem's vq\n");

		return ret;

	}

	virtio_device_ready(vdev);



	return 0;

}



static unsigned int features[] = {

	VIRTIO_PMEM_F_SHMEM_REGION,

};
@@ -155,6 +177,8 @@ static struct virtio_driver virtio_pmem_driver = { 
	.validate		= virtio_pmem_validate,

	.probe			= virtio_pmem_probe,

	.remove			= virtio_pmem_remove,

	.freeze			= virtio_pmem_freeze,

	.restore		= virtio_pmem_restore,

};



module_virtio_driver(virtio_pmem_driver);