111 lines
4.0 KiB
Python
111 lines
4.0 KiB
Python
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#!/usr/bin/env python
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#############################################################################
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# Mellanox
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#
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# Module contains an implementation of SONiC Platform Base API and
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# provides the Chassis information which are available in the platform
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#
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#############################################################################
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import sys
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try:
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from sonic_platform_base.chassis_base import ChassisBase
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from os.path import join
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import io
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import re
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import subprocess
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import syslog
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except ImportError as e:
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raise ImportError (str(e) + "- required module not found")
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HWMGMT_SYSTEM_ROOT = '/var/run/hw-management/system/'
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#reboot cause related definitions
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REBOOT_CAUSE_ROOT = HWMGMT_SYSTEM_ROOT
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REBOOT_CAUSE_POWER_LOSS_FILE = 'reset_main_pwr_fail'
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REBOOT_CAUSE_AUX_POWER_LOSS_FILE = 'reset_aux_pwr_or_ref'
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REBOOT_CAUSE_THERMAL_OVERLOAD_ASIC_FILE = 'reset_asic_thermal'
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REBOOT_CAUSE_WATCHDOG_FILE = 'reset_hotswap_or_wd'
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REBOOT_CAUSE_MLNX_FIRMWARE_RESET = 'reset_fw_reset'
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REBOOT_CAUSE_LONG_PB = 'reset_long_pb'
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REBOOT_CAUSE_SHORT_PB = 'reset_short_pb'
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REBOOT_CAUSE_FILE_LENGTH = 1
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# ========================== Syslog wrappers ==========================
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SYSLOG_IDENTIFIER = "mlnx-chassis"
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def log_warning(msg, also_print_to_console=False):
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syslog.openlog(SYSLOG_IDENTIFIER)
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syslog.syslog(syslog.LOG_WARNING, msg)
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syslog.closelog()
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class Chassis(ChassisBase):
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"""Platform-specific Chassis class"""
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def __init__(self):
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super(Chassis, self).__init__()
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def _read_generic_file(self, filename, len):
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"""
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Read a generic file, returns the contents of the file
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"""
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result = ''
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try:
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fileobj = io.open(filename)
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result = fileobj.read(len)
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fileobj.close()
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return result
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except Exception as e:
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log_warning("Fail to read file {} due to {}".format(filename, repr(e)))
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return ''
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def _verify_reboot_cause(self, filename):
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'''
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Open and read the reboot cause file in
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/var/run/hwmanagement/system (which is defined as REBOOT_CAUSE_ROOT)
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If a reboot cause file doesn't exists, returns '0'.
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'''
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try:
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return bool(int(self._read_generic_file(join(REBOOT_CAUSE_ROOT, filename), REBOOT_CAUSE_FILE_LENGTH).rstrip('\n')))
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except:
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return False
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def get_reboot_cause(self):
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"""
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Retrieves the cause of the previous reboot
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Returns:
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A tuple (string, string) where the first element is a string
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containing the cause of the previous reboot. This string must be
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one of the predefined strings in this class. If the first string
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is "REBOOT_CAUSE_HARDWARE_OTHER", the second string can be used
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to pass a description of the reboot cause.
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"""
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#read reboot causes files in the following order
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minor_cause = ''
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if self._verify_reboot_cause(REBOOT_CAUSE_POWER_LOSS_FILE):
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major_cause = self.REBOOT_CAUSE_POWER_LOSS
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elif self._verify_reboot_cause(REBOOT_CAUSE_AUX_POWER_LOSS_FILE):
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major_cause = self.REBOOT_CAUSE_POWER_LOSS
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elif self._verify_reboot_cause(REBOOT_CAUSE_THERMAL_OVERLOAD_ASIC_FILE):
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major_cause = self.REBOOT_CAUSE_THERMAL_OVERLOAD_ASIC
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elif self._verify_reboot_cause(REBOOT_CAUSE_WATCHDOG_FILE):
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major_cause = self.REBOOT_CAUSE_WATCHDOG
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else:
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major_cause = self.REBOOT_CAUSE_HARDWARE_OTHER
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if self._verify_reboot_cause(REBOOT_CAUSE_MLNX_FIRMWARE_RESET):
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minor_cause = "Reset by ASIC firmware"
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elif self._verify_reboot_cause(REBOOT_CAUSE_LONG_PB):
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minor_cause = "Reset by long press on power button"
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elif self._verify_reboot_cause(REBOOT_CAUSE_SHORT_PB):
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minor_cause = "Reset by short press on power button"
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else:
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major_cause = self.REBOOT_CAUSE_NON_HARDWARE
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return major_cause, minor_cause
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