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Subject[PATCH] virtio_mmio: pm: Add notification handlers for restore and freeze
From: Yurii Danilovskyi <glyd@opensynergy.com>

Handle restore and freeze notifications from the PM core. Expose
these to individual virtio drivers that can quiesce and resume vq
operations.

Signed-off-by: Yurii Danilovskyi <glyd@opensynergy.com>
Signed-off-by: Mikhail Golubev <Mikhail.Golubev@opensynergy.com>
---
drivers/virtio/virtio_mmio.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 56128b9c46eb..af79f8c2a2f2 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -762,6 +762,24 @@ static void vm_unregister_cmdline_devices(void)

#endif

+static int __maybe_unused virtio_mmio_freeze(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);
+
+ return virtio_device_freeze(&vm_dev->vdev);
+}
+
+static int __maybe_unused virtio_mmio_restore(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);
+
+ return virtio_device_restore(&vm_dev->vdev);
+}
+
+static SIMPLE_DEV_PM_OPS(virtio_mmio_pm_ops, virtio_mmio_freeze, virtio_mmio_restore);
+
/* Platform driver */

static const struct of_device_id virtio_mmio_match[] = {
@@ -785,6 +803,7 @@ static struct platform_driver virtio_mmio_driver = {
.name = "virtio-mmio",
.of_match_table = virtio_mmio_match,
.acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match),
+ .pm = &virtio_mmio_pm_ops,
},
};

--
2.34.1

--

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