linux-kernel - [PATCH] virtio: Add virtio-device power management

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Date:   Mon, 13 Nov 2023 14:51:38 +0900
From:   David Stevens <stevensd@...omium.org>
To:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     David Stevens <stevensd@...omium.org>
Subject: [PATCH] virtio: Add virtio-device power management

Virtio power management for virtio pci devices is defined on top of PCI
power management, so it mostly works out of the box. All that's needed
is to add suspend/resume callbacks to the virtio core, instead of
reusing the freeze/restore.

Signed-off-by: David Stevens <stevensd@...omium.org>
---
 drivers/virtio/virtio_pci_common.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index c2524a7207cf..0cad900eaf4f 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -492,8 +492,27 @@ static int virtio_pci_restore(struct device *dev)
 	return virtio_device_restore(&vp_dev->vdev);
 }
 
+static int virtio_pci_suspend(struct device *dev)
+{
+	struct pci_dev *pci_dev = to_pci_dev(dev);
+
+	return pci_dev->pm_cap ? 0 : virtio_pci_freeze(dev);
+}
+
+static int virtio_pci_resume(struct device *dev)
+{
+	struct pci_dev *pci_dev = to_pci_dev(dev);
+
+	return pci_dev->pm_cap ? 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
 
-- 
2.42.0.869.gea05f2083d-goog