541 lines
17 KiB
Python
541 lines
17 KiB
Python
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#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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# Copyright 2019 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""ChromeOS Uart Stress Test
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This tester runs the command 'chargen' on EC and/or AP, captures the
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output, and compares it against the expected output to check any characters
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lost.
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Prerequisite:
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(1) This test needs PySerial. Please check if it is available before test.
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Can be installed by 'pip install pyserial'
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(2) If servod is running, turn uart_timestamp off before running this test.
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e.g. dut-control cr50_uart_timestamp:off
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"""
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from __future__ import print_function
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from chromite.lib import cros_logging as logging
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import argparse
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import atexit
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import serial
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import os
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import stat
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import sys
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import threading
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import time
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BAUDRATE = 115200 # Default baudrate setting for UART port
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CROS_USERNAME = 'root' # Account name to login to ChromeOS
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CROS_PASSWORD = 'test0000' # Password to login to ChromeOS
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CHARGEN_TXT = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
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# The result of 'chargen 62 62'
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CHARGEN_TXT_LEN = len(CHARGEN_TXT)
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CR = '\r' # Carriage Return
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LF = '\n' # Line Feed
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CRLF = CR + LF
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FLAG_FILENAME = '/tmp/chargen_testing'
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TPM_CMD = ('trunks_client --key_create --rsa=2048 --usage=sign'
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' --key_blob=/tmp/blob &> /dev/null')
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# A ChromeOS TPM command for the cr50 stress
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# purpose.
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CR50_LOAD_GEN_CMD = ('while [[ -f %s ]]; do %s; done &'
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% (FLAG_FILENAME, TPM_CMD))
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# A command line to run TPM_CMD in background
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# infinitely.
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class ChargenTestError(Exception):
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"""Exception for Uart Stress Test Error"""
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pass
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class UartSerial(object):
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"""Test Object for a single UART serial device
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Attributes
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UART_DEV_PROFILES
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"""
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UART_DEV_PROFILES = (
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# Kernel
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{
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'prompt':'localhost login:',
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'device_type':'AP',
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'prepare_cmd':[
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CROS_USERNAME, # Login
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CROS_PASSWORD, # Password
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'dmesg -D', # Disable console message
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'touch ' + FLAG_FILENAME, # Create a temp file
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],
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'cleanup_cmd':[
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'rm -f ' + FLAG_FILENAME, # Remove the temp file
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'dmesg -E', # Enable console message
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'logout', # Logout
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],
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'end_of_input':LF,
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},
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# EC
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{
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'prompt':'> ',
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'device_type':'EC',
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'prepare_cmd':[
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'chan save',
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'chan 0' # Disable console message
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],
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'cleanup_cmd':['', 'chan restore'],
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'end_of_input':CRLF,
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},
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)
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def __init__(self, port, duration, timeout=1,
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baudrate=BAUDRATE, cr50_workload=False):
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"""Initialize UartSerial
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Args:
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port: UART device path. e.g. /dev/ttyUSB0
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duration: Time to test, in seconds
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timeout: Read timeout value.
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baudrate: Baud rate such as 9600 or 115200.
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cr50_workload: True if a workload should be generated on cr50
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Attributes:
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char_loss_occurrences: Number that character loss happens
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cleanup_cli: Command list to perform before the test exits
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cr50_workload: True if cr50 should be stressed, or False otherwise
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dev_prof: Dictionary of device profile
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duration: Time to keep chargen running
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eol: Characters to add at the end of input
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logger: object that store the log
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num_ch_exp: Expected number of characters in output
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num_ch_cap: Number of captured characters in output
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test_cli: Command list to run for chargen test
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test_thread: Thread object that captures the UART output
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serial: serial.Serial object
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"""
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# Initialize serial object
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self.serial = serial.Serial()
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self.serial.port = port
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self.serial.timeout = timeout
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self.serial.baudrate = baudrate
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self.duration = duration
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self.cr50_workload = cr50_workload
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self.logger = logging.getLogger(type(self).__name__ + '| ' + port)
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self.test_thread = threading.Thread(target=self.stress_test_thread)
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self.dev_prof = {}
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self.cleanup_cli = []
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self.test_cli = []
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self.eol = CRLF
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self.num_ch_exp = 0
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self.num_ch_cap = 0
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self.char_loss_occurrences = 0
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atexit.register(self.cleanup)
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def run_command(self, command_lines, delay=0):
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"""Run command(s) at UART prompt
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Args:
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command_lines: list of commands to run.
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delay: delay after a command in second
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"""
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for cli in command_lines:
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self.logger.debug('run %r', cli)
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self.serial.write(cli + self.eol)
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self.serial.flush()
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if delay:
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time.sleep(delay)
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def cleanup(self):
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"""Before termination, clean up the UART device."""
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self.logger.debug('Closing...')
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self.serial.open()
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self.run_command(self.cleanup_cli) # Run cleanup commands
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self.serial.close()
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self.logger.debug('Cleanup done')
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def get_output(self):
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"""Capture the UART output
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Args:
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stop_char: Read output buffer until it reads stop_char.
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Returns:
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text from UART output.
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"""
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if self.serial.inWaiting() == 0:
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time.sleep(1)
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return self.serial.read(self.serial.inWaiting())
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def prepare(self):
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"""Prepare the test:
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Identify the type of UART device (EC or Kernel?), then
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decide what kind of commands to use to generate stress loads.
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Raises:
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ChargenTestError if UART source can't be identified.
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"""
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try:
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self.logger.info('Preparing...')
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self.serial.open()
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# Prepare the device for test
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self.serial.flushInput()
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self.serial.flushOutput()
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self.get_output() # drain data
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# Give a couple of line feeds, and capture the prompt text
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self.run_command(['', ''])
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prompt_txt = self.get_output()
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# Detect the device source: EC or AP?
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# Detect if the device is AP or EC console based on the captured.
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for dev_prof in self.UART_DEV_PROFILES:
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if dev_prof['prompt'] in prompt_txt:
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self.dev_prof = dev_prof
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break
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else:
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# No prompt patterns were found. UART seems not responding or in
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# an undesirable status.
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if prompt_txt:
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raise ChargenTestError('%s: Got an unknown prompt text: %s\n'
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'Check manually whether %s is available.' %
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(self.serial.port, prompt_txt,
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self.serial.port))
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else:
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raise ChargenTestError('%s: Got no input. Close any other connections'
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' to this port, and try it again.' %
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self.serial.port)
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self.logger.info('Detected as %s UART', self.dev_prof['device_type'])
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# Log displays the UART type (AP|EC) instead of device filename.
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self.logger = logging.getLogger(type(self).__name__ + '| ' +
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self.dev_prof['device_type'])
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# Either login to AP or run some commands to prepare the device
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# for test
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self.eol = self.dev_prof['end_of_input']
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self.run_command(self.dev_prof['prepare_cmd'], delay=2)
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self.cleanup_cli += self.dev_prof['cleanup_cmd']
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# Check whether the command 'chargen' is available in the device.
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# 'chargen 1 4' is supposed to print '0000'
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self.get_output() # drain data
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self.run_command(['chargen 1 4'])
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tmp_txt = self.get_output()
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# Check whether chargen command is available.
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if '0000' not in tmp_txt:
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raise ChargenTestError('%s: Chargen got an unexpected result: %s' %
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(self.dev_prof['device_type'], tmp_txt))
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self.num_ch_exp = int(self.serial.baudrate * self.duration / 10)
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self.test_cli = ['chargen %d %d' % (CHARGEN_TXT_LEN, self.num_ch_exp)]
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self.logger.info('Ready to test')
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finally:
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self.serial.close()
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def stress_test_thread(self):
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"""Test thread
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Raises:
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ChargenTestError: if broken character is found.
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"""
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try:
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self.serial.open()
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self.serial.flushInput()
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self.serial.flushOutput()
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# Run TPM command in background to burden cr50.
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if self.dev_prof['device_type'] == 'AP' and self.cr50_workload:
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self.run_command([CR50_LOAD_GEN_CMD])
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self.logger.debug('run TPM job while %s exists', FLAG_FILENAME)
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# Run the command 'chargen', one time
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self.get_output() # Drain the output
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self.run_command(self.test_cli)
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self.serial.readline() # Drain the echoed command line.
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err_msg = '%s: Expected %r but got %s after %d char received'
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# Keep capturing the output until the test timer is expired.
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self.num_ch_cap = 0
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self.char_loss_occurrences = 0
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data_starve_count = 0
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total_num_ch = self.num_ch_exp # Expected number of characters in total
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ch_exp = CHARGEN_TXT[0]
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ch_cap = 'z' # any character value is ok for loop initial condition.
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while self.num_ch_cap < total_num_ch:
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captured = self.get_output()
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if captured:
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# There is some output data. Reset the data starvation count.
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data_starve_count = 0
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else:
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data_starve_count += 1
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if data_starve_count > 1:
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# If nothing was captured more than once, then terminate the test.
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self.logger.debug('No more output')
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break
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for ch_cap in captured:
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if ch_cap not in CHARGEN_TXT:
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# If it is not alpha-numeric, terminate the test.
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if ch_cap not in CRLF:
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# If it is neither a CR nor LF, then it is an error case.
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self.logger.error('Whole captured characters: %r', captured)
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raise ChargenTestError(err_msg % ('Broken char captured', ch_exp,
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hex(ord(ch_cap)),
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self.num_ch_cap))
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# Set the loop termination condition true.
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total_num_ch = self.num_ch_cap
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if self.num_ch_cap >= total_num_ch:
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break
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if ch_exp != ch_cap:
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# If it is alpha-numeric but not continuous, then some characters
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# are lost.
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self.logger.error(err_msg, 'Char loss detected',
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ch_exp, repr(ch_cap), self.num_ch_cap)
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self.char_loss_occurrences += 1
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# Recalculate the expected number of characters to adjust
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# termination condition. The loss might be bigger than this
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# adjustment, but it is okay since it will terminates by either
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# CR/LF detection or by data starvation.
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idx_ch_exp = CHARGEN_TXT.find(ch_exp)
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idx_ch_cap = CHARGEN_TXT.find(ch_cap)
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if idx_ch_cap < idx_ch_exp:
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idx_ch_cap += len(CHARGEN_TXT)
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total_num_ch -= (idx_ch_cap - idx_ch_exp)
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self.num_ch_cap += 1
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# Determine What character is expected next?
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ch_exp = CHARGEN_TXT[(CHARGEN_TXT.find(ch_cap) + 1) % CHARGEN_TXT_LEN]
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finally:
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self.serial.close()
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def start_test(self):
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"""Start the test thread"""
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self.logger.info('Test thread starts')
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self.test_thread.start()
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def wait_test_done(self):
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"""Wait until the test thread get done and join"""
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self.test_thread.join()
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self.logger.info('Test thread is done')
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def get_result(self):
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"""Display the result
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Returns:
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Integer = the number of lost character
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Raises:
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ChargenTestError: if the capture is corrupted.
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"""
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# If more characters than expected are captured, it means some messages
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# from other than chargen are mixed. Stop processing further.
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if self.num_ch_exp < self.num_ch_cap:
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raise ChargenTestError('%s: UART output is corrupted.' %
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self.dev_prof['device_type'])
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# Get the count difference between the expected to the captured
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# as the number of lost character.
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char_lost = self.num_ch_exp - self.num_ch_cap
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self.logger.info('%8d char lost / %10d (%.1f %%)',
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char_lost, self.num_ch_exp,
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char_lost * 100.0 / self.num_ch_exp)
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return char_lost, self.num_ch_exp, self.char_loss_occurrences
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|
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class ChargenTest(object):
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"""UART stress tester
|
||
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Attributes:
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||
|
|
cr50_workload: True if cr50 should be stressed, or False otherwise
|
||
|
|
duration: Time to keep testing in seconds
|
||
|
|
logger: logging object
|
||
|
|
ports: List of Uart device filename
|
||
|
|
serials: Dictionary where key is filename of UART device, and the value is
|
||
|
|
UartSerial object
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, ports, duration, cr50_workload=False):
|
||
|
|
"""Initialize UART stress tester
|
||
|
|
|
||
|
|
Args:
|
||
|
|
ports: List of UART ports to test.
|
||
|
|
duration: Time to keep testing in seconds.
|
||
|
|
cr50_workload: True if a workload should be generated on cr50
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
ChargenTestError: if any of ports is not a valid character device.
|
||
|
|
"""
|
||
|
|
|
||
|
|
# Save the arguments
|
||
|
|
self.ports = ports
|
||
|
|
for port in ports:
|
||
|
|
try:
|
||
|
|
mode = os.stat(port).st_mode
|
||
|
|
except OSError as e:
|
||
|
|
raise ChargenTestError(e)
|
||
|
|
if not stat.S_ISCHR(mode):
|
||
|
|
raise ChargenTestError('%s is not a character device.' % port)
|
||
|
|
|
||
|
|
if duration <= 0:
|
||
|
|
raise ChargenTestError('Input error: duration is not positive.')
|
||
|
|
self.duration = duration
|
||
|
|
|
||
|
|
self.cr50_workload = cr50_workload
|
||
|
|
|
||
|
|
# Initialize logging object
|
||
|
|
self.logger = logging.getLogger(type(self).__name__)
|
||
|
|
|
||
|
|
# Create an UartSerial object per UART port
|
||
|
|
self.serials = {} # UartSerial objects
|
||
|
|
for port in self.ports:
|
||
|
|
self.serials[port] = UartSerial(port=port, duration=self.duration,
|
||
|
|
cr50_workload=self.cr50_workload)
|
||
|
|
|
||
|
|
def prepare(self):
|
||
|
|
"""Prepare the test for each UART port"""
|
||
|
|
self.logger.info('Prepare ports for test')
|
||
|
|
for _, ser in self.serials.items():
|
||
|
|
ser.prepare()
|
||
|
|
self.logger.info('Ports are ready to test')
|
||
|
|
|
||
|
|
def print_result(self):
|
||
|
|
"""Display the test result for each UART port
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
char_lost: Total number of characters lost
|
||
|
|
"""
|
||
|
|
char_lost = 0
|
||
|
|
for _, ser in self.serials.items():
|
||
|
|
(tmp_lost, _, _) = ser.get_result()
|
||
|
|
char_lost += tmp_lost
|
||
|
|
|
||
|
|
# If any characters are lost, then test fails.
|
||
|
|
msg = 'lost %d character(s) from the test' % char_lost
|
||
|
|
if char_lost > 0:
|
||
|
|
self.logger.error('FAIL: %s', msg)
|
||
|
|
else:
|
||
|
|
self.logger.info('PASS: %s', msg)
|
||
|
|
|
||
|
|
return char_lost
|
||
|
|
|
||
|
|
def run(self):
|
||
|
|
"""Run the stress test on UART port(s)
|
||
|
|
|
||
|
|
Raises:
|
||
|
|
ChargenTestError: If any characters are lost.
|
||
|
|
"""
|
||
|
|
|
||
|
|
# Detect UART source type, and decide which command to test.
|
||
|
|
self.prepare()
|
||
|
|
|
||
|
|
# Run the test on each UART port in thread.
|
||
|
|
self.logger.info('Test starts')
|
||
|
|
for _, ser in self.serials.items():
|
||
|
|
ser.start_test()
|
||
|
|
|
||
|
|
# Wait all tests to finish.
|
||
|
|
for _, ser in self.serials.items():
|
||
|
|
ser.wait_test_done()
|
||
|
|
|
||
|
|
# Print the result.
|
||
|
|
char_lost = self.print_result()
|
||
|
|
if char_lost:
|
||
|
|
raise ChargenTestError('Test failed: lost %d character(s)' %
|
||
|
|
char_lost)
|
||
|
|
|
||
|
|
self.logger.info('Test is done')
|
||
|
|
|
||
|
|
def parse_args(cmdline):
|
||
|
|
"""Parse command line arguments.
|
||
|
|
|
||
|
|
Args:
|
||
|
|
cmdline: list to be parsed
|
||
|
|
|
||
|
|
Returns:
|
||
|
|
tuple (options, args) where args is a list of cmdline arguments that the
|
||
|
|
parser was unable to match i.e. they're servod controls, not options.
|
||
|
|
"""
|
||
|
|
description = """%(prog)s repeats sending a uart console command
|
||
|
|
to each UART device for a given time, and check if output
|
||
|
|
has any missing characters.
|
||
|
|
|
||
|
|
Examples:
|
||
|
|
%(prog)s /dev/ttyUSB2 --time 3600
|
||
|
|
%(prog)s /dev/ttyUSB1 /dev/ttyUSB2 --debug
|
||
|
|
%(prog)s /dev/ttyUSB1 /dev/ttyUSB2 --cr50
|
||
|
|
"""
|
||
|
|
|
||
|
|
parser = argparse.ArgumentParser(description=description,
|
||
|
|
formatter_class=argparse.RawTextHelpFormatter
|
||
|
|
)
|
||
|
|
parser.add_argument('port', type=str, nargs="*",
|
||
|
|
help='UART device path to test')
|
||
|
|
parser.add_argument('-c', '--cr50', action='store_true', default=False,
|
||
|
|
help='generate TPM workload on cr50')
|
||
|
|
parser.add_argument('-d', '--debug', action='store_true', default=False,
|
||
|
|
help='enable debug messages')
|
||
|
|
parser.add_argument('-t', '--time', type=int,
|
||
|
|
help='Test duration in second', default=300)
|
||
|
|
return parser.parse_known_args(cmdline)
|
||
|
|
|
||
|
|
|
||
|
|
def main():
|
||
|
|
"""Main function wrapper"""
|
||
|
|
try:
|
||
|
|
(options, _) = parse_args(sys.argv[1:])
|
||
|
|
|
||
|
|
# Set Log format
|
||
|
|
log_format = '%(asctime)s %(levelname)-6s | %(name)-25s'
|
||
|
|
date_format = '%Y-%m-%d %H:%M:%S'
|
||
|
|
if options.debug:
|
||
|
|
log_format += ' | %(filename)s:%(lineno)4d:%(funcName)-18s'
|
||
|
|
loglevel = logging.DEBUG
|
||
|
|
else:
|
||
|
|
loglevel = logging.INFO
|
||
|
|
log_format += ' | %(message)s'
|
||
|
|
|
||
|
|
logging.basicConfig(level=loglevel, format=log_format,
|
||
|
|
datefmt=date_format)
|
||
|
|
|
||
|
|
# Create a ChargenTest object
|
||
|
|
utest = ChargenTest(options.port, options.time, options.cr50)
|
||
|
|
utest.run() # Run
|
||
|
|
|
||
|
|
except KeyboardInterrupt:
|
||
|
|
sys.exit(0)
|
||
|
|
|
||
|
|
except ChargenTestError as e:
|
||
|
|
logging.error(str(e))
|
||
|
|
sys.exit(1)
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
main()
|