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| author | Shriram Rajagopalan <rshriram@cs.ubc.ca> | 2011-02-22 23:59:06 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-03-16 18:42:56 +0100 |
| commit | b3e96c0c756211e805c6941d4a6e5f6e1995cb6b (patch) | |
| tree | 1e11a95ae6d234f98e20f40dcc89cf28df229ca4 /drivers/xen/xenbus | |
| parent | xen: xenbus PM events support (diff) | |
| download | linux-b3e96c0c756211e805c6941d4a6e5f6e1995cb6b.tar.xz linux-b3e96c0c756211e805c6941d4a6e5f6e1995cb6b.zip | |
xen: use freeze/restore/thaw PM events for suspend/resume/chkpt
Use PM_FREEZE, PM_THAW and PM_RESTORE power events for
suspend/resume/checkpoint functionality, instead of PM_SUSPEND
and PM_RESUME. Use of these pm events fixes the Xen Guest hangup
when taking checkpoints. When a suspend event is cancelled
(while taking checkpoints once/continuously), we use PM_THAW
instead of PM_RESUME. PM_RESTORE is used when suspend is not
cancelled. See Documentation/power/devices.txt and linux/pm.h
for more info about freeze, thaw and restore. The sequence of
pm events in a suspend-resume scenario is shown below.
dpm_suspend_start(PMSG_FREEZE);
dpm_suspend_noirq(PMSG_FREEZE);
sysdev_suspend(PMSG_FREEZE);
cancelled = suspend_hypercall()
sysdev_resume();
dpm_resume_noirq(cancelled ? PMSG_THAW : PMSG_RESTORE);
dpm_resume_end(cancelled ? PMSG_THAW : PMSG_RESTORE);
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/xenbus')
| -rw-r--r-- | drivers/xen/xenbus/xenbus_probe_frontend.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c b/drivers/xen/xenbus/xenbus_probe_frontend.c index ea83999c02f3..b6a2690c9d49 100644 --- a/drivers/xen/xenbus/xenbus_probe_frontend.c +++ b/drivers/xen/xenbus/xenbus_probe_frontend.c @@ -86,9 +86,11 @@ static struct device_attribute xenbus_frontend_dev_attrs[] = { }; static const struct dev_pm_ops xenbus_pm_ops = { - .suspend = xenbus_dev_suspend, - .resume = xenbus_dev_resume, - .thaw = xenbus_dev_cancel, + .suspend = xenbus_dev_suspend, + .resume = xenbus_dev_resume, + .freeze = xenbus_dev_suspend, + .thaw = xenbus_dev_cancel, + .restore = xenbus_dev_resume, }; static struct xen_bus_type xenbus_frontend = { |