From d58586500ca96c43d29e5746d7f208ad8bd224ce Mon Sep 17 00:00:00 2001
From: paavaanan <paavaanan_t_n@dell.com>
Date: Fri, 19 Jul 2019 05:20:05 -0400
Subject: [PATCH] [DellEMC] Watchdog support DellEMCS6100

---
 build_debian.sh                               |   7 +
 .../s6100/scripts/s6100_platform.sh           |   4 +
 .../s6100/sonic_platform/watchdog.py          | 183 ++++++++++++++++++
 3 files changed, 194 insertions(+)
 create mode 100755 platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/watchdog.py

diff --git a/build_debian.sh b/build_debian.sh
index 9910ea742e9b..63759626cb80 100755
--- a/build_debian.sh
+++ b/build_debian.sh
@@ -250,6 +250,7 @@ sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y in
     locales                 \
     flashrom                \
     cgroup-tools            \
+    watchdog                \
     mcelog
 
 #Adds a locale to a debian system in non-interactive mode
@@ -411,6 +412,12 @@ sudo cp files/dhcp/snmpcommunity $FILESYSTEM_ROOT/etc/dhcp/dhclient-exit-hooks.d
 sudo cp files/dhcp/vrf $FILESYSTEM_ROOT/etc/dhcp/dhclient-exit-hooks.d/
 sudo cp files/dhcp/dhclient.conf $FILESYSTEM_ROOT/etc/dhcp/
 
+## Config watchdog device and disable at startup
+sudo sed -i 's/#watchdog-device/watchdog-device/' $FILESYSTEM_ROOT/etc/watchdog.conf
+sudo sed -i 's/run_watchdog=1/run_watchdog=0/' $FILESYSTEM_ROOT/etc/default/watchdog
+sudo rm -rf $FILESYSTEM_ROOT/lib/systemd/system/wd_keepalive.service
+sudo rm -rf $FILESYSTEM_ROOT/etc/init.d/wd_keepalive
+
 ## Version file
 sudo mkdir -p $FILESYSTEM_ROOT/etc/sonic
 sudo tee $FILESYSTEM_ROOT/etc/sonic/sonic_version.yml > /dev/null <<EOF
diff --git a/platform/broadcom/sonic-platform-modules-dell/s6100/scripts/s6100_platform.sh b/platform/broadcom/sonic-platform-modules-dell/s6100/scripts/s6100_platform.sh
index 2d51639f87d6..7c7edd0898e7 100755
--- a/platform/broadcom/sonic-platform-modules-dell/s6100/scripts/s6100_platform.sh
+++ b/platform/broadcom/sonic-platform-modules-dell/s6100/scripts/s6100_platform.sh
@@ -239,6 +239,10 @@ if [[ "$1" == "init" ]]; then
         /usr/local/bin/platform_watchdog_disable.sh
     fi
 
+    #Enable watcdog with nowayout
+    rmmod iTCO_wdt
+    modprobe iTCO_wdt nowayout=1
+
     cpu_board_mux "new_device"
     switch_board_mux "new_device"
     sys_eeprom "new_device"
diff --git a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/watchdog.py b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/watchdog.py
new file mode 100755
index 000000000000..943312f96658
--- /dev/null
+++ b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/watchdog.py
@@ -0,0 +1,183 @@
+#
+# watchdog_base.py
+#
+# Abstract base class for implementing a platform-specific class with which
+# to interact with a hardware watchdog module in SONiC
+#
+try:
+    import os
+    import sys
+    import subprocess
+    import logging
+    import time
+    from sonic_platform_base.watchdog_base import WatchdogBase
+except ImportError as e:
+    raise ImportError(str(e) + "- required module not found")
+
+
+class Watchdog(WatchdogBase):
+    """
+    Abstract base class for interfacing with a hardware watchdog module
+    """
+    WATCHDOG_DEFAULT_FILE = "/etc/default/watchdog"
+    WATCHDOG_CONFIG_FILE = "/etc/watchdog.conf"
+
+    WATCHDOG_START = "systemctl start watchdog.service"
+    WATCHDOG_STATUS = "systemctl status watchdog.service"
+    WATCHDOG_STOP = "systemctl stop watchdog.service"
+    WATCHDOG_RESTART = "systemctl restart watchdog.service"
+
+    def run_command(self, command):
+
+        proc = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE)
+        (out, err) = proc.communicate()
+
+        if proc.returncode != 0:
+            sys.exit(proc.returncode)
+
+    def write_config(self, filename, search, replace):
+
+        retval = -1
+
+        if (not os.path.isfile(filename)):
+            print filename,  'not found !'
+            return retval
+
+        with open(filename, "r") as file:
+            filedata = file.read()
+
+        if filedata:
+            filedata = filedata.replace(search, replace)
+
+        with open(filename, 'w') as file:
+            file.write(filedata)
+
+    def check_config(self, filename, param):
+
+        filedata = open(filename).read()
+        for item in filedata.split("\n"):
+            if param in item:
+                return item
+
+        return None
+
+    def get_wd_register(self, reg_name):
+
+        retval = 'ERR'
+        WATCHDOG_SYS_DIR = "/sys/class/watchdog/watchdog0"
+
+        wd_reg_file = WATCHDOG_SYS_DIR+'/'+reg_name
+
+        if (not os.path.isfile(wd_reg_file)):
+            print wd_reg_file,  'not found !'
+            return retval
+
+        try:
+            with open(wd_reg_file, 'r') as fd:
+                retval = fd.read()
+        except Exception as error:
+            logging.error("Unable to open ", wd_reg_file, "file !")
+
+        retval = retval.rstrip('\r\n')
+        retval = retval.lstrip(" ")
+        return retval
+
+    def arm(self, seconds):
+        """
+        Arm the hardware watchdog with a timeout of <seconds> seconds.
+        If the watchdog is currently armed, calling this function will
+        simply reset the timer to the provided value. If the underlying
+        hardware does not support the value provided in <seconds>, this
+        method should arm the watchdog with the *next greater* available
+        value.
+
+        Returns:
+            An integer specifying the *actual* number of seconds the watchdog
+            was armed with. On failure returns -1.
+        """
+
+        # Max timeout is 30 seconds
+        if seconds > 30:
+            seconds = 30
+
+        # Enable watchdog in boot-up
+        watchdog_enable = self.check_config(
+                                self.WATCHDOG_DEFAULT_FILE,
+                                "run_watchdog=1")
+        if watchdog_enable is None:
+            self.write_config(
+                self.WATCHDOG_DEFAULT_FILE,
+                "run_watchdog=0",
+                "run_watchdog=1")
+
+        # configure watchdog-timeout
+        new_timeout = 'watchdog-timeout        = ' + str(seconds)
+        old_timeout = self.check_config(
+                            self.WATCHDOG_CONFIG_FILE,
+                            "watchdog-timeout")
+
+        if old_timeout is not None:
+            self.write_config(
+                self.WATCHDOG_CONFIG_FILE,
+                old_timeout,
+                new_timeout)
+        else:
+            with open(self.WATCHDOG_CONFIG_FILE, "a") as wd_file:
+                wd_file.write(new_timeout)
+            self.run_command(self.WATCHDOG_START)
+
+        # Restart watchdog service
+        self.run_command(self.WATCHDOG_RESTART)
+
+        if self.get_wd_register("timeout") == str(seconds):
+            return seconds
+
+        return -1
+
+    def disarm(self):
+        """
+        Disarm 'watchdog-timeout' in open(self.WATCHDOG_CONFIG_FILE).read():
+         the hardware watchdog
+
+        Returns:
+            A boolean, True if watchdog is disarmed successfully, False if not
+        """
+        if self.get_wd_register("state") == "active":
+
+            # Disable watchdog in boot-up
+            self.write_config(
+                self.WATCHDOG_DEFAULT_FILE,
+                "run_watchdog=1",
+                "run_watchdog=0")
+
+            return True
+
+        return False
+
+    def is_armed(self):
+        """
+        Retrieves the armed state of the hardware watchdog.
+
+        Returns:
+            A boolean, True if watchdog is armed, False if not
+        """
+
+        if self.get_wd_register("state") == "active":
+            return True
+
+        return False
+
+    def get_remaining_time(self):
+        """
+        If the watchdog is armed, retrieve the number of seconds remaining on
+        the watchdog timer
+
+        Returns:
+            An integer specifying the number of seconds remaining on thei
+            watchdog timer. If the watchdog is not armed, returns -1.
+        """
+        if self.get_wd_register("state") == "active":
+            return self.get_wd_register("timeleft")
+
+        return -1
+