virtio: Add support for no-reset virtio PCI PM

If a virtio_pci_device supports native PCI power management and has the
No_Soft_Reset bit set, then skip resetting and reinitializing the device
when suspending and restoring the device. This allows system-wide low
power states like s2idle to be used in systems with stateful virtio
devices that can't simply be re-initialized (e.g. virtio-fs).

Signed-off-by: David Stevens <stevensd@chromium.org>
Message-Id: <20231208070754.3132339-1-stevensd@chromium.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 7a5593997e0efe64f2ce832bf0c8676bbaabf188..1d21d1a1b3f55a9a2410396ec8e9d3b2cfcbdb13 100644 (file)
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -492,8 +492,40 @@ static int virtio_pci_restore(struct device *dev)
        return virtio_device_restore(&vp_dev->vdev);
 }
 
+static bool vp_supports_pm_no_reset(struct device *dev)
+{
+       struct pci_dev *pci_dev = to_pci_dev(dev);
+       u16 pmcsr;
+
+       if (!pci_dev->pm_cap)
+               return false;
+
+       pci_read_config_word(pci_dev, pci_dev->pm_cap + PCI_PM_CTRL, &pmcsr);
+       if (PCI_POSSIBLE_ERROR(pmcsr)) {
+               dev_err(dev, "Unable to query pmcsr");
+               return false;
+       }
+
+       return pmcsr & PCI_PM_CTRL_NO_SOFT_RESET;
+}
+
+static int virtio_pci_suspend(struct device *dev)
+{
+       return vp_supports_pm_no_reset(dev) ? 0 : virtio_pci_freeze(dev);
+}
+
+static int virtio_pci_resume(struct device *dev)
+{
+       return vp_supports_pm_no_reset(dev) ? 0 : virtio_pci_restore(dev);
+}
+
 static const struct dev_pm_ops virtio_pci_pm_ops = {
-       SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
+       .suspend = virtio_pci_suspend,
+       .resume = virtio_pci_resume,
+       .freeze = virtio_pci_freeze,
+       .thaw = virtio_pci_restore,
+       .poweroff = virtio_pci_freeze,
+       .restore = virtio_pci_restore,
 };
 #endif