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xen/control: improve suspend/resume

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Implement several small improvements to the suspend/resume Xen sequence:

 - Call the power_suspend_early event before stopping all processes.
 - Stop all processes. This was done implicitly previously by putting all
   the CPUs in a known IPI handler.
 - Warm up the timecounter.
 - Re-initialize the time of day register.

Sponsored by: Citrix Systems R&D
This commit is contained in:
royger 2016-05-02 18:23:48 +00:00
parent 2da46e01a0
commit f31121f9b6
1 changed files with 12 additions and 2 deletions
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14
sys/dev/xen/control/control.c
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@ -122,6 +122,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sched.h>
#include <sys/smp.h>
#include <sys/eventhandler.h>
#include <sys/timetc.h>
#include <geom/geom.h>
@ -197,6 +198,8 @@ xctrl_suspend()
#endif
int suspend_cancelled;
EVENTHANDLER_INVOKE(power_suspend_early);
stop_all_proc();
EVENTHANDLER_INVOKE(power_suspend);
if (smp_started) {
@ -222,7 +225,6 @@ xctrl_suspend()
printf("%s: device_suspend failed\n", __func__);
return;
}
mtx_unlock(&Giant);
#ifdef SMP
CPU_ZERO(&cpu_suspend_map); /* silence gcc */
@ -273,16 +275,24 @@ xctrl_suspend()
* FreeBSD really needs to add DEVICE_SUSPEND_CANCEL or
* similar.
*/
mtx_lock(&Giant);
DEVICE_RESUME(root_bus);
mtx_unlock(&Giant);
/*
* Warm up timecounter again and reset system clock.
*/
timecounter->tc_get_timecount(timecounter);
timecounter->tc_get_timecount(timecounter);
inittodr(time_second);
if (smp_started) {
thread_lock(curthread);
sched_unbind(curthread);
thread_unlock(curthread);
}
resume_all_proc();
EVENTHANDLER_INVOKE(power_resume);
if (bootverbose)