Author: avg Date: Mon May 21 20:23:04 2018 New Revision: 333994 URL: https://svnweb.freebsd.org/changeset/base/333994
Log: stop and restart kernel event timers in the suspend / resume cycle I have a system that is very unstable after resuming from suspend-to-RAM but only if HPET is used as the event timer. The theory is that SMM code / firmware could be enabling HPET for its own uses and unexpected interrupts cause a trouble for it. Originally I wanted to solve the problem in hpet_suspend() method, but that was insufficient as the event timer could get reprogrammed again. So, it's better, for my case and in general, to stop the event timer(s) before entering the hardware suspend. MFC after: 4 weeks Differential Revision: https://reviews.freebsd.org/D15413 Modified: head/sys/dev/acpica/acpi.c head/sys/kern/kern_clocksource.c head/sys/sys/systm.h Modified: head/sys/dev/acpica/acpi.c ============================================================================== --- head/sys/dev/acpica/acpi.c Mon May 21 20:20:28 2018 (r333993) +++ head/sys/dev/acpica/acpi.c Mon May 21 20:23:04 2018 (r333994) @@ -2958,6 +2958,7 @@ acpi_EnterSleepState(struct acpi_softc *sc, int state) if (sc->acpi_sleep_delay > 0) DELAY(sc->acpi_sleep_delay * 1000000); + suspendclock(); intr = intr_disable(); if (state != ACPI_STATE_S1) { sleep_result = acpi_sleep_machdep(sc, state); @@ -3028,6 +3029,8 @@ acpi_EnterSleepState(struct acpi_softc *sc, int state) * process. This handles both the error and success cases. */ backout: + if (slp_state >= ACPI_SS_SLP_PREP) + resumeclock(); if (slp_state >= ACPI_SS_GPE_SET) { acpi_wake_prep_walk(state); sc->acpi_sstate = ACPI_STATE_S0; Modified: head/sys/kern/kern_clocksource.c ============================================================================== --- head/sys/kern/kern_clocksource.c Mon May 21 20:20:28 2018 (r333993) +++ head/sys/kern/kern_clocksource.c Mon May 21 20:23:04 2018 (r333994) @@ -698,6 +698,22 @@ cpu_initclocks_ap(void) spinlock_exit(); } +void +suspendclock(void) +{ + ET_LOCK(); + configtimer(0); + ET_UNLOCK(); +} + +void +resumeclock(void) +{ + ET_LOCK(); + configtimer(1); + ET_UNLOCK(); +} + /* * Switch to profiling clock rates. */ Modified: head/sys/sys/systm.h ============================================================================== --- head/sys/sys/systm.h Mon May 21 20:20:28 2018 (r333993) +++ head/sys/sys/systm.h Mon May 21 20:23:04 2018 (r333994) @@ -333,6 +333,8 @@ void startprofclock(struct proc *); void stopprofclock(struct proc *); void cpu_startprofclock(void); void cpu_stopprofclock(void); +void suspendclock(void); +void resumeclock(void); sbintime_t cpu_idleclock(void); void cpu_activeclock(void); void cpu_new_callout(int cpu, sbintime_t bt, sbintime_t bt_opt); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
