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 | } |
150 | |