Add qemu 2.4.0

[kvmfornfv.git] / qemu / hw / watchdog / watchdog.c

diff --git a/qemu/hw/watchdog/watchdog.c b/qemu/hw/watchdog/watchdog.c
new file mode 100644 (file)
index 0000000..8d4b0ee
--- /dev/null
+++ b/qemu/hw/watchdog/watchdog.c
@@ -0,0 +1,152 @@
+/*
+ * 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 "sysemu/sysemu.h"
+#include "sysemu/watchdog.h"
+#include "qapi-event.h"
+#include "hw/nmi.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. */
+#define WDT_NMI          7     /* Inject nmi into the guest */
+
+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(qemu_find_opts("device"), NULL, 0,
+                                    &error_abort);
+            qemu_opt_set(opts, "driver", p, &error_abort);
+            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 if (strcasecmp(p, "inject-nmi") == 0)
+        watchdog_action = WDT_NMI;
+    else
+        return -1;
+
+    return 0;
+}
+
+/* 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 */
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_RESET, &error_abort);
+        qemu_system_reset_request();
+        break;
+
+    case WDT_SHUTDOWN:          /* same as 'system_powerdown' in monitor */
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_SHUTDOWN, &error_abort);
+        qemu_system_powerdown_request();
+        break;
+
+    case WDT_POWEROFF:          /* same as 'quit' command in monitor */
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_POWEROFF, &error_abort);
+        exit(0);
+
+    case WDT_PAUSE:             /* same as 'stop' command in monitor */
+        /* In a timer callback, when vm_stop calls qemu_clock_enable
+         * you would get a deadlock.  Bypass the problem.
+         */
+        qemu_system_vmstop_request_prepare();
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_PAUSE, &error_abort);
+        qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
+        break;
+
+    case WDT_DEBUG:
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_DEBUG, &error_abort);
+        fprintf(stderr, "watchdog: timer fired\n");
+        break;
+
+    case WDT_NONE:
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_NONE, &error_abort);
+        break;
+
+    case WDT_NMI:
+        qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_INJECT_NMI,
+                                 &error_abort);
+        inject_nmi();
+        break;
+    }
+}