diff options
Diffstat (limited to 'drivers/s390/char/sclp_quiesce.c')
| -rw-r--r-- | drivers/s390/char/sclp_quiesce.c | 57 |
1 files changed, 42 insertions, 15 deletions
diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c index 84c191c1cd6..475e470d976 100644 --- a/drivers/s390/char/sclp_quiesce.c +++ b/drivers/s390/char/sclp_quiesce.c @@ -1,8 +1,7 @@ /* - * drivers/s390/char/sclp_quiesce.c * signal quiesce handler * - * (C) Copyright IBM Corp. 1999,2004 + * Copyright IBM Corp. 1999, 2004 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> */ @@ -13,43 +12,71 @@ #include <linux/smp.h> #include <linux/init.h> #include <linux/reboot.h> -#include <asm/atomic.h> +#include <linux/atomic.h> #include <asm/ptrace.h> -#include <asm/sigp.h> #include <asm/smp.h> #include "sclp.h" +static void (*old_machine_restart)(char *); +static void (*old_machine_halt)(void); +static void (*old_machine_power_off)(void); + /* Shutdown handler. Signal completion of shutdown by loading special PSW. */ -static void -do_machine_quiesce(void) +static void do_machine_quiesce(void) { psw_t quiesce_psw; smp_send_stop(); - quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT; + quiesce_psw.mask = + PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT; quiesce_psw.addr = 0xfff; __load_psw(quiesce_psw); } /* Handler for quiesce event. Start shutdown procedure. */ -static void -sclp_quiesce_handler(struct evbuf_header *evbuf) +static void sclp_quiesce_handler(struct evbuf_header *evbuf) { - _machine_restart = (void *) do_machine_quiesce; - _machine_halt = do_machine_quiesce; - _machine_power_off = do_machine_quiesce; + if (_machine_restart != (void *) do_machine_quiesce) { + old_machine_restart = _machine_restart; + old_machine_halt = _machine_halt; + old_machine_power_off = _machine_power_off; + _machine_restart = (void *) do_machine_quiesce; + _machine_halt = do_machine_quiesce; + _machine_power_off = do_machine_quiesce; + } ctrl_alt_del(); } +/* Undo machine restart/halt/power_off modification on resume */ +static void sclp_quiesce_pm_event(struct sclp_register *reg, + enum sclp_pm_event sclp_pm_event) +{ + switch (sclp_pm_event) { + case SCLP_PM_EVENT_RESTORE: + if (old_machine_restart) { + _machine_restart = old_machine_restart; + _machine_halt = old_machine_halt; + _machine_power_off = old_machine_power_off; + old_machine_restart = NULL; + old_machine_halt = NULL; + old_machine_power_off = NULL; + } + break; + case SCLP_PM_EVENT_FREEZE: + case SCLP_PM_EVENT_THAW: + break; + } +} + static struct sclp_register sclp_quiesce_event = { .receive_mask = EVTYP_SIGQUIESCE_MASK, - .receiver_fn = sclp_quiesce_handler + .receiver_fn = sclp_quiesce_handler, + .pm_event_fn = sclp_quiesce_pm_event }; /* Initialize quiesce driver. */ -static int __init -sclp_quiesce_init(void) +static int __init sclp_quiesce_init(void) { return sclp_register(&sclp_quiesce_event); } |