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: Philip Chen <philipchen@xxxxxxxxxxxx>
---
drivers/nvdimm/virtio_pmem.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/nvdimm/virtio_pmem.c b/drivers/nvdimm/virtio_pmem.c
index c9b97aeabf85..2396d19ce549 100644
--- a/drivers/nvdimm/virtio_pmem.c
+++ b/drivers/nvdimm/virtio_pmem.c
@@ -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);
--
2.46.0.76.ge559c4bf1a-goog
