capstone: Update to upstream "next" branch
[qemu.git] / hw / watchdog / watchdog.c
1 /*
2 * Virtual hardware watchdog.
3 *
4 * Copyright (C) 2009 Red Hat Inc.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 *
19 * By Richard W.M. Jones (rjones@redhat.com).
20 */
21
22 #include "qemu/osdep.h"
23 #include "qemu/option.h"
24 #include "qemu/config-file.h"
25 #include "qemu/queue.h"
26 #include "qapi/error.h"
27 #include "qapi/qapi-commands-run-state.h"
28 #include "qapi/qapi-events-run-state.h"
29 #include "sysemu/runstate.h"
30 #include "sysemu/watchdog.h"
31 #include "hw/nmi.h"
32 #include "qemu/help_option.h"
33
34 static WatchdogAction watchdog_action = WATCHDOG_ACTION_RESET;
35 static QLIST_HEAD(, WatchdogTimerModel) watchdog_list;
36
37 void watchdog_add_model(WatchdogTimerModel *model)
38 {
39 QLIST_INSERT_HEAD(&watchdog_list, model, entry);
40 }
41
42 /* Returns:
43 * 0 = continue
44 * 1 = exit program with error
45 * 2 = exit program without error
46 */
47 int select_watchdog(const char *p)
48 {
49 WatchdogTimerModel *model;
50 QemuOpts *opts;
51
52 /* -watchdog ? lists available devices and exits cleanly. */
53 if (is_help_option(p)) {
54 QLIST_FOREACH(model, &watchdog_list, entry) {
55 fprintf(stderr, "\t%s\t%s\n",
56 model->wdt_name, model->wdt_description);
57 }
58 return 2;
59 }
60
61 QLIST_FOREACH(model, &watchdog_list, entry) {
62 if (strcasecmp(model->wdt_name, p) == 0) {
63 /* add the device */
64 opts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
65 &error_abort);
66 qemu_opt_set(opts, "driver", p, &error_abort);
67 return 0;
68 }
69 }
70
71 fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
72 QLIST_FOREACH(model, &watchdog_list, entry) {
73 fprintf(stderr, "\t%s\t%s\n",
74 model->wdt_name, model->wdt_description);
75 }
76 return 1;
77 }
78
79 int select_watchdog_action(const char *p)
80 {
81 int action;
82 char *qapi_value;
83
84 qapi_value = g_ascii_strdown(p, -1);
85 action = qapi_enum_parse(&WatchdogAction_lookup, qapi_value, -1, NULL);
86 g_free(qapi_value);
87 if (action < 0)
88 return -1;
89 qmp_watchdog_set_action(action, &error_abort);
90 return 0;
91 }
92
93 WatchdogAction get_watchdog_action(void)
94 {
95 return watchdog_action;
96 }
97
98 /* This actually performs the "action" once a watchdog has expired,
99 * ie. reboot, shutdown, exit, etc.
100 */
101 void watchdog_perform_action(void)
102 {
103 switch (watchdog_action) {
104 case WATCHDOG_ACTION_RESET: /* same as 'system_reset' in monitor */
105 qapi_event_send_watchdog(WATCHDOG_ACTION_RESET);
106 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
107 break;
108
109 case WATCHDOG_ACTION_SHUTDOWN: /* same as 'system_powerdown' in monitor */
110 qapi_event_send_watchdog(WATCHDOG_ACTION_SHUTDOWN);
111 qemu_system_powerdown_request();
112 break;
113
114 case WATCHDOG_ACTION_POWEROFF: /* same as 'quit' command in monitor */
115 qapi_event_send_watchdog(WATCHDOG_ACTION_POWEROFF);
116 exit(0);
117
118 case WATCHDOG_ACTION_PAUSE: /* same as 'stop' command in monitor */
119 /* In a timer callback, when vm_stop calls qemu_clock_enable
120 * you would get a deadlock. Bypass the problem.
121 */
122 qemu_system_vmstop_request_prepare();
123 qapi_event_send_watchdog(WATCHDOG_ACTION_PAUSE);
124 qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
125 break;
126
127 case WATCHDOG_ACTION_DEBUG:
128 qapi_event_send_watchdog(WATCHDOG_ACTION_DEBUG);
129 fprintf(stderr, "watchdog: timer fired\n");
130 break;
131
132 case WATCHDOG_ACTION_NONE:
133 qapi_event_send_watchdog(WATCHDOG_ACTION_NONE);
134 break;
135
136 case WATCHDOG_ACTION_INJECT_NMI:
137 qapi_event_send_watchdog(WATCHDOG_ACTION_INJECT_NMI);
138 nmi_monitor_handle(0, NULL);
139 break;
140
141 default:
142 assert(0);
143 }
144 }
145
146 void qmp_watchdog_set_action(WatchdogAction action, Error **errp)
147 {
148 watchdog_action = action;
149 }