1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * signal quiesce handler 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright IBM Corp. 1999, 2004 6*4882a593Smuzhiyun * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> 7*4882a593Smuzhiyun * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <linux/types.h> 11*4882a593Smuzhiyun #include <linux/cpumask.h> 12*4882a593Smuzhiyun #include <linux/smp.h> 13*4882a593Smuzhiyun #include <linux/init.h> 14*4882a593Smuzhiyun #include <linux/reboot.h> 15*4882a593Smuzhiyun #include <linux/atomic.h> 16*4882a593Smuzhiyun #include <asm/ptrace.h> 17*4882a593Smuzhiyun #include <asm/smp.h> 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun #include "sclp.h" 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun static void (*old_machine_restart)(char *); 22*4882a593Smuzhiyun static void (*old_machine_halt)(void); 23*4882a593Smuzhiyun static void (*old_machine_power_off)(void); 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /* Shutdown handler. Signal completion of shutdown by loading special PSW. */ do_machine_quiesce(void)26*4882a593Smuzhiyunstatic void do_machine_quiesce(void) 27*4882a593Smuzhiyun { 28*4882a593Smuzhiyun psw_t quiesce_psw; 29*4882a593Smuzhiyun 30*4882a593Smuzhiyun smp_send_stop(); 31*4882a593Smuzhiyun quiesce_psw.mask = 32*4882a593Smuzhiyun PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT; 33*4882a593Smuzhiyun quiesce_psw.addr = 0xfff; 34*4882a593Smuzhiyun __load_psw(quiesce_psw); 35*4882a593Smuzhiyun } 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun /* Handler for quiesce event. Start shutdown procedure. */ sclp_quiesce_handler(struct evbuf_header * evbuf)38*4882a593Smuzhiyunstatic void sclp_quiesce_handler(struct evbuf_header *evbuf) 39*4882a593Smuzhiyun { 40*4882a593Smuzhiyun if (_machine_restart != (void *) do_machine_quiesce) { 41*4882a593Smuzhiyun old_machine_restart = _machine_restart; 42*4882a593Smuzhiyun old_machine_halt = _machine_halt; 43*4882a593Smuzhiyun old_machine_power_off = _machine_power_off; 44*4882a593Smuzhiyun _machine_restart = (void *) do_machine_quiesce; 45*4882a593Smuzhiyun _machine_halt = do_machine_quiesce; 46*4882a593Smuzhiyun _machine_power_off = do_machine_quiesce; 47*4882a593Smuzhiyun } 48*4882a593Smuzhiyun ctrl_alt_del(); 49*4882a593Smuzhiyun } 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun /* Undo machine restart/halt/power_off modification on resume */ sclp_quiesce_pm_event(struct sclp_register * reg,enum sclp_pm_event sclp_pm_event)52*4882a593Smuzhiyunstatic void sclp_quiesce_pm_event(struct sclp_register *reg, 53*4882a593Smuzhiyun enum sclp_pm_event sclp_pm_event) 54*4882a593Smuzhiyun { 55*4882a593Smuzhiyun switch (sclp_pm_event) { 56*4882a593Smuzhiyun case SCLP_PM_EVENT_RESTORE: 57*4882a593Smuzhiyun if (old_machine_restart) { 58*4882a593Smuzhiyun _machine_restart = old_machine_restart; 59*4882a593Smuzhiyun _machine_halt = old_machine_halt; 60*4882a593Smuzhiyun _machine_power_off = old_machine_power_off; 61*4882a593Smuzhiyun old_machine_restart = NULL; 62*4882a593Smuzhiyun old_machine_halt = NULL; 63*4882a593Smuzhiyun old_machine_power_off = NULL; 64*4882a593Smuzhiyun } 65*4882a593Smuzhiyun break; 66*4882a593Smuzhiyun case SCLP_PM_EVENT_FREEZE: 67*4882a593Smuzhiyun case SCLP_PM_EVENT_THAW: 68*4882a593Smuzhiyun break; 69*4882a593Smuzhiyun } 70*4882a593Smuzhiyun } 71*4882a593Smuzhiyun 72*4882a593Smuzhiyun static struct sclp_register sclp_quiesce_event = { 73*4882a593Smuzhiyun .receive_mask = EVTYP_SIGQUIESCE_MASK, 74*4882a593Smuzhiyun .receiver_fn = sclp_quiesce_handler, 75*4882a593Smuzhiyun .pm_event_fn = sclp_quiesce_pm_event 76*4882a593Smuzhiyun }; 77*4882a593Smuzhiyun 78*4882a593Smuzhiyun /* Initialize quiesce driver. */ sclp_quiesce_init(void)79*4882a593Smuzhiyunstatic int __init sclp_quiesce_init(void) 80*4882a593Smuzhiyun { 81*4882a593Smuzhiyun return sclp_register(&sclp_quiesce_event); 82*4882a593Smuzhiyun } 83*4882a593Smuzhiyun device_initcall(sclp_quiesce_init); 84