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| author |   Shriram Rajagopalan <rshriram@cs.ubc.ca> | 2011-02-22 14:59:06 -0800 |
|---|---|---|
| committer |   Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-03-16 13:42:56 -0400 |
| commit | b3e96c0c756211e805c6941d4a6e5f6e1995cb6b (patch) | |
| tree | 1e11a95ae6d234f98e20f40dcc89cf28df229ca4 /drivers/xen | |
| parent | xen: xenbus PM events support (diff) | |
| download | linux-dev-b3e96c0c756211e805c6941d4a6e5f6e1995cb6b.tar.xz linux-dev-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')
| -rw-r--r-- | drivers/xen/manage.c | 16 | ||||
| -rw-r--r-- | drivers/xen/xenbus/xenbus_probe_frontend.c | 8 |
2 files changed, 13 insertions, 11 deletions
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c index ebb292859b59..95143dd6904d 100644 --- a/drivers/xen/manage.c +++ b/drivers/xen/manage.c @@ -61,7 +61,7 @@ static void xen_post_suspend(int cancelled) xen_mm_unpin_all(); } -#ifdef CONFIG_PM_SLEEP +#ifdef CONFIG_HIBERNATION static int xen_suspend(void *data) { struct suspend_info *si = data; @@ -69,7 +69,7 @@ static int xen_suspend(void *data) BUG_ON(!irqs_disabled()); - err = sysdev_suspend(PMSG_SUSPEND); + err = sysdev_suspend(PMSG_FREEZE); if (err) { printk(KERN_ERR "xen_suspend: sysdev_suspend failed: %d\n", err); @@ -118,7 +118,7 @@ static void do_suspend(void) } #endif - err = dpm_suspend_start(PMSG_SUSPEND); + err = dpm_suspend_start(PMSG_FREEZE); if (err) { printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err); goto out_thaw; @@ -127,7 +127,7 @@ static void do_suspend(void) printk(KERN_DEBUG "suspending xenstore...\n"); xs_suspend(); - err = dpm_suspend_noirq(PMSG_SUSPEND); + err = dpm_suspend_noirq(PMSG_FREEZE); if (err) { printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err); goto out_resume; @@ -147,7 +147,7 @@ static void do_suspend(void) err = stop_machine(xen_suspend, &si, cpumask_of(0)); - dpm_resume_noirq(PMSG_RESUME); + dpm_resume_noirq(si.cancelled ? PMSG_THAW : PMSG_RESTORE); if (err) { printk(KERN_ERR "failed to start xen_suspend: %d\n", err); @@ -161,7 +161,7 @@ out_resume: } else xs_suspend_cancel(); - dpm_resume_end(PMSG_RESUME); + dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE); /* Make sure timer events get retriggered on all CPUs */ clock_was_set(); @@ -173,7 +173,7 @@ out: #endif shutting_down = SHUTDOWN_INVALID; } -#endif /* CONFIG_PM_SLEEP */ +#endif /* CONFIG_HIBERNATION */ struct shutdown_handler { const char *command; @@ -202,7 +202,7 @@ static void shutdown_handler(struct xenbus_watch *watch, { "poweroff", do_poweroff }, { "halt", do_poweroff }, { "reboot", do_reboot }, -#ifdef CONFIG_PM_SLEEP +#ifdef CONFIG_HIBERNATION { "suspend", do_suspend }, #endif {NULL, NULL}, 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 = { |