diff options
| author | Dexuan Cui | 2019-09-05 23:01:17 +0000 |
|---|---|---|
| committer | Sasha Levin | 2019-09-06 14:52:44 -0400 |
| commit | 271b2224d42f88870e6b060924ee374871c131fc (patch) | |
| tree | d25ba2bce5a00dc6b667eee734ec4ad69347c35f /drivers/hv | |
| parent | ed56ef675ae6ef0e6f7d42b9c42dae61172f0960 (diff) | |
Drivers: hv: vmbus: Implement suspend/resume for VSC drivers for hibernation
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>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 2ef375ce58ac..a30c70adf9a0 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -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 { |