[Nokia-7215][armhf] Enable Watchdog service (sonic-net#16612)

Enable CPUWDT service to enable watchdog

platform/marvell-armhf/sonic-platform-nokia/7215/scripts/cpu_wdt.py

@@ -0,0 +1,46 @@
+#!/usr/bin/python
+
+from sonic_platform.chassis import Chassis
+from sonic_py_common import logger
+import time
+import os
+import signal
+import sys
+
+
+TIMEOUT=170
+KEEPALIVE=55
+sonic_logger = logger.Logger('Watchdog')
+sonic_logger.set_min_log_priority_info()
+time.sleep(60)
+chassis = Chassis()
+watchdog = chassis.get_watchdog()
+
+def stopWdtService(signal, frame):
+    watchdog._disablewatchdog()
+    sonic_logger.log_notice("CPUWDT Disabled: watchdog armed=%s" % watchdog.is_armed() )
+    sys.exit()
+
+def main():
+
+    signal.signal(signal.SIGHUP, signal.SIG_IGN)
+    signal.signal(signal.SIGINT, stopWdtService)
+    signal.signal(signal.SIGTERM, stopWdtService)
+
+    watchdog.arm(TIMEOUT)
+    sonic_logger.log_notice("CPUWDT Enabled: watchdog armed=%s" % watchdog.is_armed() )
+
+
+    while True:
+        time.sleep(KEEPALIVE)
+        watchdog._keepalive()
+        sonic_logger.log_info("CPUWDT keepalive")
+    done
+
+    stopWdtService
+
+    return
+
+
+if __name__ == '__main__':
+    main()

platform/marvell-armhf/sonic-platform-nokia/7215/service/cpu_wdt.service

@@ -0,0 +1,8 @@
+[Unit]
+Description=CPU WDT
+After=nokia-7215init.service
+[Service]
+ExecStart=/usr/local/bin/cpu_wdt.py
+
+[Install]
+WantedBy=multi-user.target

platform/marvell-armhf/sonic-platform-nokia/7215/sonic_platform/watchdog.py

@@ -8,7 +8,7 @@
 import os
 import fcntl
 import array
-
+import time
 from sonic_platform_base.watchdog_base import WatchdogBase
 
 """ ioctl constants """
@@ -35,7 +35,7 @@
 WDIOS_ENABLECARD = 0x0002
 
 """ watchdog sysfs """
-WD_SYSFS_PATH = "/sys/class/watchdog/"
+WD_SYSFS_PATH = "/sys/class/watchdog/watchdog0/"
 
 WD_COMMON_ERROR = -1
 
@@ -52,16 +52,32 @@ def __init__(self, wd_device_path):
         @param wd_device_path Path to watchdog device
         """
         super(WatchdogImplBase, self).__init__()
-
+
+        self.watchdog=""
         self.watchdog_path = wd_device_path
-        self.watchdog = os.open(self.watchdog_path, os.O_WRONLY)
-
-        # Opening a watchdog descriptor starts
-        # watchdog timer; by default it should be stopped
-        self._disablewatchdog()
-        self.armed = False
+        self.wd_state_reg = WD_SYSFS_PATH+"state"
+        self.wd_timeout_reg = WD_SYSFS_PATH+"timeout"
+        self.wd_timeleft_reg = WD_SYSFS_PATH+"timeleft"
+
         self.timeout = self._gettimeout()
 
+    def _read_sysfs_file(self, sysfs_file):
+        # On successful read, returns the value read from given
+        # reg_name and on failure returns 'ERR'
+        rv = 'ERR'
+
+        if (not os.path.isfile(sysfs_file)):
+            return rv
+        try:
+            with open(sysfs_file, 'r') as fd:
+                rv = fd.read()
+        except Exception as e:
+            rv = 'ERR'
+
+        rv = rv.rstrip('\r\n')
+        rv = rv.lstrip(" ")
+        return rv
+
     def _disablewatchdog(self):
         """
         Turn off the watchdog timer
@@ -102,11 +118,10 @@ def _gettimeout(self):
         Get watchdog timeout
         @return watchdog timeout
         """
+        timeout=0
+        timeout=self._read_sysfs_file(self.wd_timeout_reg)
 
-        req = array.array('I', [0])
-        fcntl.ioctl(self.watchdog, WDIOC_GETTIMEOUT, req, True)
-
-        return int(req[0])
+        return timeout
 
     def _gettimeleft(self):
         """
@@ -127,15 +142,20 @@ def arm(self, seconds):
         ret = WD_COMMON_ERROR
         if seconds < 0:
             return ret
-
+
+        # Stop the watchdog service to gain access of watchdog file pointer
+        if self.is_armed():
+            os.popen("systemctl stop cpu_wdt.service")
+            time.sleep(2)
+        if not self.watchdog:
+            self.watchdog = os.open(self.watchdog_path, os.O_WRONLY)
         try:
             if self.timeout != seconds:
                 self.timeout = self._settimeout(seconds)
-            if self.armed:
+            if self.is_armed():
                 self._keepalive()
             else:
                 self._enablewatchdog()
-                self.armed = True
             ret = self.timeout
         except IOError:
             pass
@@ -150,22 +170,31 @@ def disarm(self):
             A boolean, True if watchdog is disarmed successfully, False
             if not
         """
-
-        try:
-            self._disablewatchdog()
-            self.armed = False
-            self.timeout = 0
-        except IOError:
-            return False
+
+        if self.is_armed():
+            os.popen("systemctl stop cpu_wdt.service")
+            time.sleep(2)
+            if not self.watchdog:
+                self.watchdog = os.open(self.watchdog_path, os.O_WRONLY)
+            try:
+                self._disablewatchdog()
+                self.timeout = 0
+            except IOError:
+                return False
 
         return True
 
     def is_armed(self):
         """
         Implements is_armed WatchdogBase API
         """
+        status = False
+
+        state = self._read_sysfs_file(self.wd_state_reg)
+        if (state != 'inactive'):
+            status = True
 
-        return self.armed
+        return status
 
     def get_remaining_time(self):
         """
@@ -174,10 +203,7 @@ def get_remaining_time(self):
 
         timeleft = WD_COMMON_ERROR
 
-        if self.armed:
-            try:
-                timeleft = self._gettimeleft()
-            except IOError:
-                pass
+        if self.is_armed():
+            timeleft=self._read_sysfs_file(self.wd_timeleft_reg)
 
-        return timeleft
+        return int(timeleft)

platform/marvell-armhf/sonic-platform-nokia/debian/sonic-platform-nokia-7215.install

@@ -1,6 +1,8 @@
 nokia-7215_plt_setup.sh usr/sbin
 7215/scripts/nokia-7215init.sh  usr/local/bin
+7215/scripts/cpu_wdt.py  usr/local/bin
 7215/service/nokia-7215init.service  etc/systemd/system
+7215/service/cpu_wdt.service  etc/systemd/system
 7215/service/fstrim.timer/timer-override.conf  /lib/systemd/system/fstrim.timer.d
 7215/sonic_platform-1.0-py3-none-any.whl usr/share/sonic/device/armhf-nokia_ixs7215_52x-r0
 inband_mgmt.sh etc/

platform/marvell-armhf/sonic-platform-nokia/debian/sonic-platform-nokia-7215.postinst

@@ -7,5 +7,8 @@ sh /usr/sbin/nokia-7215_plt_setup.sh
 systemctl enable nokia-7215init.service
 systemctl start nokia-7215init.service
 
+systemctl enable cpu_wdt.service
+systemctl start cpu_wdt.service
+
 exit 0