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Subject[PATCH v3 02/11] virtio: pci: add PM notification handlers for restore, freeze, thaw, poweroff
Date
Handle restore and freeze notification from the PM core.  Expose these
to individual virtio drivers that can quiesce and resume vq operations.

These functions also save device-specific data so that the device can be
put in pre-suspend state after resume, and disable and enable the PCI
device in the freeze and resume functions, respectively.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
drivers/virtio/virtio_pci.c | 50 +++++++++++++++++++++++++++++++++++++++++++
include/linux/virtio.h | 4 +++
2 files changed, 54 insertions(+), 0 deletions(-)

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 5d36bc0..0db6f98 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -55,6 +55,10 @@ struct virtio_pci_device
unsigned msix_vectors;
/* Vectors allocated, excluding per-vq vectors if any */
unsigned msix_used_vectors;
+
+ /* Status saved during hibernate/restore */
+ u8 saved_status;
+
/* Whether we have vector per vq */
bool per_vq_vectors;
};
@@ -708,9 +712,55 @@ static int virtio_pci_resume(struct device *dev)
return 0;
}

+static int virtio_pci_freeze(struct device *dev)
+{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
+ struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
+ struct virtio_driver *drv;
+ int ret;
+
+ drv = container_of(vp_dev->vdev.dev.driver,
+ struct virtio_driver, driver);
+
+ ret = 0;
+ vp_dev->saved_status = vp_get_status(&vp_dev->vdev);
+ if (drv && drv->freeze)
+ ret = drv->freeze(&vp_dev->vdev);
+
+ if (!ret)
+ pci_disable_device(pci_dev);
+ return ret;
+}
+
+static int virtio_pci_restore(struct device *dev)
+{
+ struct pci_dev *pci_dev = to_pci_dev(dev);
+ struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
+ struct virtio_driver *drv;
+ int ret;
+
+ drv = container_of(vp_dev->vdev.dev.driver,
+ struct virtio_driver, driver);
+
+ ret = pci_enable_device(pci_dev);
+ if (ret)
+ return ret;
+ pci_set_master(pci_dev);
+ vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
+ vp_finalize_features(&vp_dev->vdev);
+ if (drv && drv->restore)
+ ret = drv->restore(&vp_dev->vdev);
+
+ return ret;
+}
+
static const struct dev_pm_ops virtio_pci_pm_ops = {
.suspend = virtio_pci_suspend,
.resume = virtio_pci_resume,
+ .freeze = virtio_pci_freeze,
+ .thaw = virtio_pci_restore,
+ .restore = virtio_pci_restore,
+ .poweroff = virtio_pci_suspend,
};
#endif

diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 4c069d8..1c26416 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -146,6 +146,10 @@ struct virtio_driver {
int (*probe)(struct virtio_device *dev);
void (*remove)(struct virtio_device *dev);
void (*config_changed)(struct virtio_device *dev);
+#ifdef CONFIG_PM
+ int (*freeze)(struct virtio_device *dev);
+ int (*restore)(struct virtio_device *dev);
+#endif
};

int register_virtio_driver(struct virtio_driver *drv);
--
1.7.7.1


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