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-rw-r--r--hw/watchdog/watchdog.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/hw/watchdog/watchdog.c b/hw/watchdog/watchdog.c
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+++ b/hw/watchdog/watchdog.c
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+/*
+ * Virtual hardware watchdog.
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * By Richard W.M. Jones (rjones@redhat.com).
+ */
+
+#include "qemu-common.h"
+#include "qemu/option.h"
+#include "qemu/config-file.h"
+#include "qemu/queue.h"
+#include "qapi/qmp/types.h"
+#include "monitor/monitor.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/watchdog.h"
+
+/* Possible values for action parameter. */
+#define WDT_RESET 1 /* Hard reset. */
+#define WDT_SHUTDOWN 2 /* Shutdown. */
+#define WDT_POWEROFF 3 /* Quit. */
+#define WDT_PAUSE 4 /* Pause. */
+#define WDT_DEBUG 5 /* Prints a message and continues running. */
+#define WDT_NONE 6 /* Do nothing. */
+
+static int watchdog_action = WDT_RESET;
+static QLIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
+
+void watchdog_add_model(WatchdogTimerModel *model)
+{
+ QLIST_INSERT_HEAD(&watchdog_list, model, entry);
+}
+
+/* Returns:
+ * 0 = continue
+ * 1 = exit program with error
+ * 2 = exit program without error
+ */
+int select_watchdog(const char *p)
+{
+ WatchdogTimerModel *model;
+ QemuOpts *opts;
+
+ /* -watchdog ? lists available devices and exits cleanly. */
+ if (is_help_option(p)) {
+ QLIST_FOREACH(model, &watchdog_list, entry) {
+ fprintf(stderr, "\t%s\t%s\n",
+ model->wdt_name, model->wdt_description);
+ }
+ return 2;
+ }
+
+ QLIST_FOREACH(model, &watchdog_list, entry) {
+ if (strcasecmp(model->wdt_name, p) == 0) {
+ /* add the device */
+ opts = qemu_opts_create_nofail(qemu_find_opts("device"));
+ qemu_opt_set(opts, "driver", p);
+ return 0;
+ }
+ }
+
+ fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
+ QLIST_FOREACH(model, &watchdog_list, entry) {
+ fprintf(stderr, "\t%s\t%s\n",
+ model->wdt_name, model->wdt_description);
+ }
+ return 1;
+}
+
+int select_watchdog_action(const char *p)
+{
+ if (strcasecmp(p, "reset") == 0)
+ watchdog_action = WDT_RESET;
+ else if (strcasecmp(p, "shutdown") == 0)
+ watchdog_action = WDT_SHUTDOWN;
+ else if (strcasecmp(p, "poweroff") == 0)
+ watchdog_action = WDT_POWEROFF;
+ else if (strcasecmp(p, "pause") == 0)
+ watchdog_action = WDT_PAUSE;
+ else if (strcasecmp(p, "debug") == 0)
+ watchdog_action = WDT_DEBUG;
+ else if (strcasecmp(p, "none") == 0)
+ watchdog_action = WDT_NONE;
+ else
+ return -1;
+
+ return 0;
+}
+
+static void watchdog_mon_event(const char *action)
+{
+ QObject *data;
+
+ data = qobject_from_jsonf("{ 'action': %s }", action);
+ monitor_protocol_event(QEVENT_WATCHDOG, data);
+ qobject_decref(data);
+}
+
+/* This actually performs the "action" once a watchdog has expired,
+ * ie. reboot, shutdown, exit, etc.
+ */
+void watchdog_perform_action(void)
+{
+ switch(watchdog_action) {
+ case WDT_RESET: /* same as 'system_reset' in monitor */
+ watchdog_mon_event("reset");
+ qemu_system_reset_request();
+ break;
+
+ case WDT_SHUTDOWN: /* same as 'system_powerdown' in monitor */
+ watchdog_mon_event("shutdown");
+ qemu_system_powerdown_request();
+ break;
+
+ case WDT_POWEROFF: /* same as 'quit' command in monitor */
+ watchdog_mon_event("poweroff");
+ exit(0);
+ break;
+
+ case WDT_PAUSE: /* same as 'stop' command in monitor */
+ watchdog_mon_event("pause");
+ vm_stop(RUN_STATE_WATCHDOG);
+ break;
+
+ case WDT_DEBUG:
+ watchdog_mon_event("debug");
+ fprintf(stderr, "watchdog: timer fired\n");
+ break;
+
+ case WDT_NONE:
+ watchdog_mon_event("none");
+ break;
+ }
+}