234 lines
6.5 KiB
Python
234 lines
6.5 KiB
Python
#!/usr/bin/env python
|
|
|
|
#############################################################################
|
|
# Celestica
|
|
#
|
|
# Watchdog contains an implementation of SONiC Platform Base API
|
|
#
|
|
#############################################################################
|
|
import ctypes
|
|
import fcntl
|
|
import os
|
|
import subprocess
|
|
import time
|
|
import array
|
|
|
|
try:
|
|
from sonic_platform_base.watchdog_base import WatchdogBase
|
|
except ImportError as e:
|
|
raise ImportError(str(e) + "- required module not found")
|
|
|
|
""" ioctl constants """
|
|
IO_WRITE = 0x40000000
|
|
IO_READ = 0x80000000
|
|
IO_READ_WRITE = 0xC0000000
|
|
IO_SIZE_INT = 0x00040000
|
|
IO_SIZE_40 = 0x00280000
|
|
IO_TYPE_WATCHDOG = ord('W') << 8
|
|
|
|
WDR_INT = IO_READ | IO_SIZE_INT | IO_TYPE_WATCHDOG
|
|
WDR_40 = IO_READ | IO_SIZE_40 | IO_TYPE_WATCHDOG
|
|
WDWR_INT = IO_READ_WRITE | IO_SIZE_INT | IO_TYPE_WATCHDOG
|
|
|
|
""" Watchdog ioctl commands """
|
|
WDIOC_GETSUPPORT = 0 | WDR_40
|
|
WDIOC_GETSTATUS = 1 | WDR_INT
|
|
WDIOC_GETBOOTSTATUS = 2 | WDR_INT
|
|
WDIOC_GETTEMP = 3 | WDR_INT
|
|
WDIOC_SETOPTIONS = 4 | WDR_INT
|
|
WDIOC_KEEPALIVE = 5 | WDR_INT
|
|
WDIOC_SETTIMEOUT = 6 | WDWR_INT
|
|
WDIOC_GETTIMEOUT = 7 | WDR_INT
|
|
WDIOC_SETPRETIMEOUT = 8 | WDWR_INT
|
|
WDIOC_GETPRETIMEOUT = 9 | WDR_INT
|
|
WDIOC_GETTIMELEFT = 10 | WDR_INT
|
|
|
|
""" Watchdog status constants """
|
|
WDIOS_DISABLECARD = 0x0001
|
|
WDIOS_ENABLECARD = 0x0002
|
|
|
|
WDT_COMMON_ERROR = -1
|
|
WD_MAIN_IDENTITY = "iTCO_wdt"
|
|
WDT_SYSFS_PATH = "/sys/class/watchdog/"
|
|
|
|
|
|
class Watchdog(WatchdogBase):
|
|
|
|
def __init__(self):
|
|
|
|
self.watchdog, self.wdt_main_dev_name = self._get_wdt()
|
|
self.status_path = "/sys/class/watchdog/%s/status" % self.wdt_main_dev_name
|
|
self.state_path = "/sys/class/watchdog/%s/state" % self.wdt_main_dev_name
|
|
self.timeout_path = "/sys/class/watchdog/%s/timeout" % self.wdt_main_dev_name
|
|
# Set default value
|
|
self._disable()
|
|
self.armed = False
|
|
self.timeout = self._gettimeout(self.timeout_path)
|
|
|
|
def _is_wd_main(self, dev):
|
|
"""
|
|
Checks watchdog identity
|
|
"""
|
|
identity = self._read_file(
|
|
"{}/{}/identity".format(WDT_SYSFS_PATH, dev))
|
|
return identity == WD_MAIN_IDENTITY
|
|
|
|
def _get_wdt(self):
|
|
"""
|
|
Retrieves watchdog device
|
|
"""
|
|
wdt_main_dev_list = [dev for dev in os.listdir(
|
|
"/dev/") if dev.startswith("watchdog") and self._is_wd_main(dev)]
|
|
if not wdt_main_dev_list:
|
|
return None
|
|
wdt_main_dev_name = wdt_main_dev_list[0]
|
|
watchdog_device_path = "/dev/{}".format(wdt_main_dev_name)
|
|
watchdog = os.open(watchdog_device_path, os.O_RDWR)
|
|
return watchdog, wdt_main_dev_name
|
|
|
|
def _read_file(self, file_path):
|
|
"""
|
|
Read text file
|
|
"""
|
|
try:
|
|
with open(file_path, "r") as fd:
|
|
txt = fd.read()
|
|
except IOError:
|
|
return WDT_COMMON_ERROR
|
|
return txt.strip()
|
|
|
|
def _enable(self):
|
|
"""
|
|
Turn on the watchdog timer
|
|
"""
|
|
req = array.array('h', [WDIOS_ENABLECARD])
|
|
fcntl.ioctl(self.watchdog, WDIOC_SETOPTIONS, req, False)
|
|
|
|
def _disable(self):
|
|
"""
|
|
Turn off the watchdog timer
|
|
"""
|
|
req = array.array('h', [WDIOS_DISABLECARD])
|
|
fcntl.ioctl(self.watchdog, WDIOC_SETOPTIONS, req, False)
|
|
|
|
def _keepalive(self):
|
|
"""
|
|
Keep alive watchdog timer
|
|
"""
|
|
fcntl.ioctl(self.watchdog, WDIOC_KEEPALIVE)
|
|
|
|
def _settimeout(self, seconds):
|
|
"""
|
|
Set watchdog timer timeout
|
|
@param seconds - timeout in seconds
|
|
@return is the actual set timeout
|
|
"""
|
|
req = array.array('I', [seconds])
|
|
fcntl.ioctl(self.watchdog, WDIOC_SETTIMEOUT, req, True)
|
|
return int(req[0])
|
|
|
|
def _gettimeout(self, timeout_path):
|
|
"""
|
|
Get watchdog timeout
|
|
@return watchdog timeout
|
|
"""
|
|
req = array.array('I', [0])
|
|
fcntl.ioctl(self.watchdog, WDIOC_GETTIMEOUT, req, True)
|
|
|
|
return int(req[0])
|
|
|
|
def _gettimeleft(self):
|
|
"""
|
|
Get time left before watchdog timer expires
|
|
@return time left in seconds
|
|
"""
|
|
req = array.array('I', [0])
|
|
fcntl.ioctl(self.watchdog, WDIOC_GETTIMELEFT, req, True)
|
|
|
|
return int(req[0])
|
|
|
|
#################################################################
|
|
|
|
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.
|
|
"""
|
|
|
|
ret = WDT_COMMON_ERROR
|
|
if seconds < 0:
|
|
return ret
|
|
|
|
try:
|
|
if self.timeout != seconds:
|
|
self.timeout = self._settimeout(seconds)
|
|
if self.armed:
|
|
self._keepalive()
|
|
else:
|
|
self._enable()
|
|
self.armed = True
|
|
ret = self.timeout
|
|
except IOError as e:
|
|
pass
|
|
|
|
return ret
|
|
|
|
def disarm(self):
|
|
"""
|
|
Disarm the hardware watchdog
|
|
Returns:
|
|
A boolean, True if watchdog is disarmed successfully, False if not
|
|
"""
|
|
disarmed = False
|
|
if self.is_armed():
|
|
try:
|
|
self._disable()
|
|
self.armed = False
|
|
disarmed = True
|
|
except IOError:
|
|
pass
|
|
|
|
return disarmed
|
|
|
|
def is_armed(self):
|
|
"""
|
|
Retrieves the armed state of the hardware watchdog.
|
|
Returns:
|
|
A boolean, True if watchdog is armed, False if not
|
|
"""
|
|
|
|
return self.armed
|
|
|
|
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.
|
|
"""
|
|
|
|
timeleft = WDT_COMMON_ERROR
|
|
|
|
if self.armed:
|
|
try:
|
|
timeleft = self._gettimeleft()
|
|
except IOError:
|
|
pass
|
|
|
|
return timeleft
|
|
|
|
def __del__(self):
|
|
"""
|
|
Close watchdog
|
|
"""
|
|
|
|
os.close(self.watchdog)
|