Commit ed7ac37f authored by Stephan Gerhold's avatar Stephan Gerhold Committed by Michael S. Tsirkin

virtio_mmio: Add missing PM calls to freeze/restore

Most virtio drivers provide freeze/restore callbacks to finish up
device usage before suspend and to reinitialize the virtio device after
resume. However, these callbacks are currently only called when using
virtio_pci. virtio_mmio does not have any PM ops defined.

This causes problems for example after suspend to disk (hibernation),
since the virtio devices might lose their state after the VMM is
restarted. Calling virtio_device_freeze()/restore() ensures that
the virtio devices are re-initialized correctly.

Fix this by implementing the dev_pm_ops for virtio_mmio,
similar to virtio_pci_common.
Signed-off-by: default avatarStephan Gerhold <stephan.gerhold@kernkonzept.com>
Message-Id: <20220621110621.3638025-2-stephan.gerhold@kernkonzept.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 11a37eb6
...@@ -62,6 +62,7 @@ ...@@ -62,6 +62,7 @@
#include <linux/list.h> #include <linux/list.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/virtio.h> #include <linux/virtio.h>
...@@ -556,6 +557,25 @@ static const struct virtio_config_ops virtio_mmio_config_ops = { ...@@ -556,6 +557,25 @@ static const struct virtio_config_ops virtio_mmio_config_ops = {
.synchronize_cbs = vm_synchronize_cbs, .synchronize_cbs = vm_synchronize_cbs,
}; };
#ifdef CONFIG_PM_SLEEP
static int virtio_mmio_freeze(struct device *dev)
{
struct virtio_mmio_device *vm_dev = dev_get_drvdata(dev);
return virtio_device_freeze(&vm_dev->vdev);
}
static int virtio_mmio_restore(struct device *dev)
{
struct virtio_mmio_device *vm_dev = dev_get_drvdata(dev);
return virtio_device_restore(&vm_dev->vdev);
}
static const struct dev_pm_ops virtio_mmio_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(virtio_mmio_freeze, virtio_mmio_restore)
};
#endif
static void virtio_mmio_release_dev(struct device *_d) static void virtio_mmio_release_dev(struct device *_d)
{ {
...@@ -799,6 +819,9 @@ static struct platform_driver virtio_mmio_driver = { ...@@ -799,6 +819,9 @@ static struct platform_driver virtio_mmio_driver = {
.name = "virtio-mmio", .name = "virtio-mmio",
.of_match_table = virtio_mmio_match, .of_match_table = virtio_mmio_match,
.acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match), .acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match),
#ifdef CONFIG_PM_SLEEP
.pm = &virtio_mmio_pm_ops,
#endif
}, },
}; };
......
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