Hardware watchdog

Here is an updated hardware watchdog patch, which should fix
everything that was raised about the previous version ...

Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 136 insertions, 0 deletions

diff --git a/hw/watchdog.c b/hw/watchdog.c
new file mode 100644
index 0000000000..c64868d2c4
--- /dev/null
+++ b/hw/watchdog.c
@@ -0,0 +1,136 @@
+/*
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ * By Richard W.M. Jones (rjones@redhat.com).
+ */
+
+#include "qemu-common.h"
+#include "sys-queue.h"
+#include "sysemu.h"
+#include "hw/watchdog.h"
+
+static LIST_HEAD(watchdog_list, WatchdogTimerModel) watchdog_list;
+
+void watchdog_add_model(WatchdogTimerModel *model)
+{
+    LIST_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;
+
+    if (watchdog) {
+        fprintf(stderr,
+                 "qemu: only one watchdog option may be given\n");
+        return 1;
+    }
+
+    /* -watchdog ? lists available devices and exits cleanly. */
+    if (strcmp(p, "?") == 0) {
+        LIST_FOREACH(model, &watchdog_list, entry) {
+            fprintf(stderr, "\t%s\t%s\n",
+                     model->wdt_name, model->wdt_description);
+        }
+        return 2;
+    }
+
+    LIST_FOREACH(model, &watchdog_list, entry) {
+        if (strcasecmp(model->wdt_name, p) == 0) {
+            watchdog = model;
+            return 0;
+        }
+    }
+
+    fprintf(stderr, "Unknown -watchdog device. Supported devices are:\n");
+    LIST_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;
+}
+
+/* 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 */
+        qemu_system_reset_request();
+        break;
+
+    case WDT_SHUTDOWN:          /* same as 'system_powerdown' in monitor */
+        qemu_system_powerdown_request();
+        break;
+
+    case WDT_POWEROFF:          /* same as 'quit' command in monitor */
+        exit(0);
+        break;
+
+    case WDT_PAUSE:             /* same as 'stop' command in monitor */
+        vm_stop(0);
+        break;
+
+    case WDT_DEBUG:
+        fprintf(stderr, "watchdog: timer fired\n");
+        break;
+
+    case WDT_NONE:
+        break;
+    }
+}
+
+void watchdog_pc_init(PCIBus *pci_bus)
+{
+    if (watchdog)
+        watchdog->wdt_pc_init(pci_bus);
+}
+
+void register_watchdogs(void)
+{
+    wdt_ib700_init();
+    wdt_i6300esb_init();
+}