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Commit 271b2224 authored by Dexuan Cui's avatar Dexuan Cui Committed by Sasha Levin
Browse files

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



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

Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
Reviewed-by: default avatarMichael Kelley <mikelley@microsoft.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent ed56ef67

drivers/hv/vmbus_drv.c

+46 −0
Original line number Diff line number Diff line
@@ -911,6 +911,43 @@ static void vmbus_shutdown(struct device *child_device) 
		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
@@ -926,6 +963,14 @@ static void vmbus_device_release(struct device *device) 
	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 */

static struct bus_type  hv_bus = {

	.name =		"vmbus",
@@ -936,6 +981,7 @@ static struct bus_type hv_bus = { 
	.uevent =		vmbus_uevent,

	.dev_groups =		vmbus_dev_groups,

	.drv_groups =		vmbus_drv_groups,

	.pm =			&vmbus_pm,

};



struct onmessage_work_context {

include/linux/hyperv.h

+3 −0
Original line number Diff line number Diff line
@@ -1157,6 +1157,9 @@ struct hv_driver { 
	int (*remove)(struct hv_device *);

	void (*shutdown)(struct hv_device *);



	int (*suspend)(struct hv_device *);

	int (*resume)(struct hv_device *);



};



/* Base device object */