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From 1a06d017fb3f388734ffbe5dedee6f8c3af5f2db Mon Sep 17 00:00:00 2001
From: Dexuan Cui <decui@microsoft.com>
Date: Sat, 11 Apr 2020 20:50:35 -0700
Subject: [PATCH] Drivers: hv: vmbus: Fix Suspend-to-Idle for Generation-2 VM
Before the hibernation patchset (e.g. f53335e3289f), in a Generation-2
Linux VM on Hyper-V, the user can run "echo freeze > /sys/power/state" to
freeze the system, i.e. Suspend-to-Idle. The user can press the keyboard
or move the mouse to wake up the VM.
With the hibernation patchset, Linux VM on Hyper-V can hibernate to disk,
but Suspend-to-Idle is broken: when the synthetic keyboard/mouse are
suspended, there is no way to wake up the VM.
Fix the issue by not suspending and resuming the vmbus devices upon
Suspend-to-Idle.
Fixes: f53335e3289f ("Drivers: hv: vmbus: Suspend/resume the vmbus itself for hibernation")
Cc: stable@vger.kernel.org
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Link: https://lore.kernel.org/r/1586663435-36243-1-git-send-email-decui@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
---
drivers/hv/vmbus_drv.c | 43 +++++++++++++++++++++++++++++++++---------
1 file changed, 34 insertions(+), 9 deletions(-)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index a68bce4d0ddb..e06c6b9555cf 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -978,6 +978,9 @@ static int vmbus_resume(struct device *child_device)
return drv->resume(dev);
}
+#else
+#define vmbus_suspend NULL
+#define vmbus_resume NULL
#endif /* CONFIG_PM_SLEEP */
/*
@@ -997,11 +1000,22 @@ static void vmbus_device_release(struct device *device)
}
/*
- * Note: we must use SET_NOIRQ_SYSTEM_SLEEP_PM_OPS rather than
- * SET_SYSTEM_SLEEP_PM_OPS: see the comment before vmbus_bus_pm.
+ * Note: we must use the "noirq" ops: see the comment before vmbus_bus_pm.
+ *
+ * suspend_noirq/resume_noirq are set to NULL to support Suspend-to-Idle: we
+ * shouldn't suspend the vmbus devices upon Suspend-to-Idle, otherwise there
+ * is no way to wake up a Generation-2 VM.
+ *
+ * The other 4 ops are for hibernation.
*/
+
static const struct dev_pm_ops vmbus_pm = {
- SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(vmbus_suspend, vmbus_resume)
+ .suspend_noirq = NULL,
+ .resume_noirq = NULL,
+ .freeze_noirq = vmbus_suspend,
+ .thaw_noirq = vmbus_resume,
+ .poweroff_noirq = vmbus_suspend,
+ .restore_noirq = vmbus_resume,
};
/* The one and only one */
@@ -2281,6 +2295,9 @@ static int vmbus_bus_resume(struct device *dev)
return 0;
}
+#else
+#define vmbus_bus_suspend NULL
+#define vmbus_bus_resume NULL
#endif /* CONFIG_PM_SLEEP */
static const struct acpi_device_id vmbus_acpi_device_ids[] = {
@@ -2291,16 +2308,24 @@ static const struct acpi_device_id vmbus_acpi_device_ids[] = {
MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
/*
- * Note: we must use SET_NOIRQ_SYSTEM_SLEEP_PM_OPS rather than
- * SET_SYSTEM_SLEEP_PM_OPS, otherwise NIC SR-IOV can not work, because the
- * "pci_dev_pm_ops" uses the "noirq" callbacks: in the resume path, the
- * pci "noirq" restore callback runs before "non-noirq" callbacks (see
+ * Note: we must use the "no_irq" ops, otherwise hibernation can not work with
+ * PCI device assignment, because "pci_dev_pm_ops" uses the "noirq" ops: in
+ * the resume path, the pci "noirq" restore op runs before "non-noirq" op (see
* resume_target_kernel() -> dpm_resume_start(), and hibernation_restore() ->
* dpm_resume_end()). This means vmbus_bus_resume() and the pci-hyperv's
- * resume callback must also run via the "noirq" callbacks.
+ * resume callback must also run via the "noirq" ops.
+ *
+ * Set suspend_noirq/resume_noirq to NULL for Suspend-to-Idle: see the comment
+ * earlier in this file before vmbus_pm.
*/
+
static const struct dev_pm_ops vmbus_bus_pm = {
- SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(vmbus_bus_suspend, vmbus_bus_resume)
+ .suspend_noirq = NULL,
+ .resume_noirq = NULL,
+ .freeze_noirq = vmbus_bus_suspend,
+ .thaw_noirq = vmbus_bus_resume,
+ .poweroff_noirq = vmbus_bus_suspend,
+ .restore_noirq = vmbus_bus_resume
};
static struct acpi_driver vmbus_acpi_driver = {
--
2.26.2
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