1/*
 2 *  drivers/s390/char/sclp_quiesce.c
 3 *     signal quiesce handler
 4 *
 5 *  (C) Copyright IBM Corp. 1999,2004
 6 *  Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 7 *             Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
 8 */
 9
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/cpumask.h>
13#include <linux/smp.h>
14#include <linux/init.h>
15#include <linux/reboot.h>
16#include <linux/atomic.h>
17#include <asm/ptrace.h>
18#include <asm/sigp.h>
19#include <asm/smp.h>
20
21#include "sclp.h"
22
23static void (*old_machine_restart)(char *);
24static void (*old_machine_halt)(void);
25static void (*old_machine_power_off)(void);
26
27/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
28static void do_machine_quiesce(void)
29{
30	psw_t quiesce_psw;
31
32	smp_send_stop();
33	quiesce_psw.mask = PSW_BASE_BITS | PSW_MASK_WAIT;
 
34	quiesce_psw.addr = 0xfff;
35	__load_psw(quiesce_psw);
36}
37
38/* Handler for quiesce event. Start shutdown procedure. */
39static void sclp_quiesce_handler(struct evbuf_header *evbuf)
40{
41	if (_machine_restart != (void *) do_machine_quiesce) {
42		old_machine_restart = _machine_restart;
43		old_machine_halt = _machine_halt;
44		old_machine_power_off = _machine_power_off;
45		_machine_restart = (void *) do_machine_quiesce;
46		_machine_halt = do_machine_quiesce;
47		_machine_power_off = do_machine_quiesce;
48	}
49	ctrl_alt_del();
50}
51
52/* Undo machine restart/halt/power_off modification on resume */
53static void sclp_quiesce_pm_event(struct sclp_register *reg,
54				  enum sclp_pm_event sclp_pm_event)
55{
56	switch (sclp_pm_event) {
57	case SCLP_PM_EVENT_RESTORE:
58		if (old_machine_restart) {
59			_machine_restart = old_machine_restart;
60			_machine_halt = old_machine_halt;
61			_machine_power_off = old_machine_power_off;
62			old_machine_restart = NULL;
63			old_machine_halt = NULL;
64			old_machine_power_off = NULL;
65		}
66		break;
67	case SCLP_PM_EVENT_FREEZE:
68	case SCLP_PM_EVENT_THAW:
69		break;
70	}
71}
72
73static struct sclp_register sclp_quiesce_event = {
74	.receive_mask = EVTYP_SIGQUIESCE_MASK,
75	.receiver_fn = sclp_quiesce_handler,
76	.pm_event_fn = sclp_quiesce_pm_event
77};
78
79/* Initialize quiesce driver. */
80static int __init sclp_quiesce_init(void)
81{
82	return sclp_register(&sclp_quiesce_event);
83}
84
85module_init(sclp_quiesce_init);

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 
 3 *     signal quiesce handler
 4 *
 5 *  Copyright IBM Corp. 1999, 2004
 6 *  Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 7 *             Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
 8 */
 9
 
10#include <linux/types.h>
11#include <linux/cpumask.h>
12#include <linux/smp.h>
13#include <linux/init.h>
14#include <linux/reboot.h>
15#include <linux/atomic.h>
16#include <asm/ptrace.h>
 
17#include <asm/smp.h>
18
19#include "sclp.h"
20
 
 
 
 
21/* Shutdown handler. Signal completion of shutdown by loading special PSW. */
22static void do_machine_quiesce(void)
23{
24	psw_t quiesce_psw;
25
26	smp_send_stop();
27	quiesce_psw.mask =
28		PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_WAIT;
29	quiesce_psw.addr = 0xfff;
30	__load_psw(quiesce_psw);
31}
32
33/* Handler for quiesce event. Start shutdown procedure. */
34static void sclp_quiesce_handler(struct evbuf_header *evbuf)
35{
36	_machine_restart = (void *) do_machine_quiesce;
37	_machine_halt = do_machine_quiesce;
38	_machine_power_off = do_machine_quiesce;
 
 
 
 
 
39	ctrl_alt_del();
40}
41
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
42static struct sclp_register sclp_quiesce_event = {
43	.receive_mask = EVTYP_SIGQUIESCE_MASK,
44	.receiver_fn = sclp_quiesce_handler,
 
45};
46
47/* Initialize quiesce driver. */
48static int __init sclp_quiesce_init(void)
49{
50	return sclp_register(&sclp_quiesce_event);
51}
52device_initcall(sclp_quiesce_init);