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Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation

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The high-level VSC drivers will implement device-specific callbacks.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dexuan Cui 2019-09-05 23:01:17 +00:00 committed by Sasha Levin
parent ed56ef675a
commit 271b2224d4
2 changed files with 49 additions and 0 deletions
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46
drivers/hv/vmbus_drv.c
View File

@ -911,6 +911,43 @@ static void vmbus_shutdown(struct device *child_device)
drv->shutdown(dev); drv->shutdown(dev);
} }
/*
* vmbus_suspend - Suspend a vmbus device
*/
static int vmbus_suspend(struct device *child_device)
{
struct hv_driver *drv;
struct hv_device *dev = device_to_hv_device(child_device);
/* The device may not be attached yet */
if (!child_device->driver)
return 0;
drv = drv_to_hv_drv(child_device->driver);
if (!drv->suspend)
return -EOPNOTSUPP;
return drv->suspend(dev);
}
/*
* vmbus_resume - Resume a vmbus device
*/
static int vmbus_resume(struct device *child_device)
{
struct hv_driver *drv;
struct hv_device *dev = device_to_hv_device(child_device);
/* The device may not be attached yet */
if (!child_device->driver)
return 0;
drv = drv_to_hv_drv(child_device->driver);
if (!drv->resume)
return -EOPNOTSUPP;
return drv->resume(dev);
}
/* /*
* vmbus_device_release - Final callback release of the vmbus child device * vmbus_device_release - Final callback release of the vmbus child device
@ -926,6 +963,14 @@ static void vmbus_device_release(struct device *device)
kfree(hv_dev); kfree(hv_dev);
} }
/*
* Note: we must use SET_NOIRQ_SYSTEM_SLEEP_PM_OPS rather than
* SET_SYSTEM_SLEEP_PM_OPS: see the comment before vmbus_bus_pm.
*/
static const struct dev_pm_ops vmbus_pm = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(vmbus_suspend, vmbus_resume)
};
/* The one and only one */ /* The one and only one */
static struct bus_type hv_bus = { static struct bus_type hv_bus = {
.name = "vmbus", .name = "vmbus",
@ -936,6 +981,7 @@ static struct bus_type hv_bus = {
.uevent = vmbus_uevent, .uevent = vmbus_uevent,
.dev_groups = vmbus_dev_groups, .dev_groups = vmbus_dev_groups,
.drv_groups = vmbus_drv_groups, .drv_groups = vmbus_drv_groups,
.pm = &vmbus_pm,
}; };
struct onmessage_work_context { struct onmessage_work_context {

3
include/linux/hyperv.h
View File

@ -1157,6 +1157,9 @@ struct hv_driver {
int (*remove)(struct hv_device *); int (*remove)(struct hv_device *);
void (*shutdown)(struct hv_device *); void (*shutdown)(struct hv_device *);
int (*suspend)(struct hv_device *);
int (*resume)(struct hv_device *);
}; };
/* Base device object */ /* Base device object */