# Copyright (c) 2015 Stephen Warren
# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0
# Common logic to interact with U-Boot via the console. This class provides
# the interface that tests use to execute U-Boot shell commands and wait for
# their results. Sub-classes exist to perform board-type-specific setup
# operations, such as spawning a sub-process for Sandbox, or attaching to the
# serial console of real hardware.
import multiplexed_log
import os
import pytest
import re
import sys
import u_boot_spawn
# Regexes for text we expect U-Boot to send to the console.
pattern_u_boot_spl_signon = re.compile('(U-Boot SPL \\d{4}\\.\\d{2}-[^\r\n]*)')
pattern_u_boot_main_signon = re.compile('(U-Boot \\d{4}\\.\\d{2}-[^\r\n]*)')
pattern_stop_autoboot_prompt = re.compile('Hit any key to stop autoboot: ')
pattern_unknown_command = re.compile('Unknown command \'.*\' - try \'help\'')
pattern_error_notification = re.compile('## Error: ')
class ConsoleDisableCheck(object):
'''Context manager (for Python's with statement) that temporarily disables
the specified console output error check. This is useful when deliberately
executing a command that is known to trigger one of the error checks, in
order to test that the error condition is actually raised. This class is
used internally by ConsoleBase::disable_check(); it is not intended for
direct usage.'''
def __init__(self, console, check_type):
self.console = console
self.check_type = check_type
def __enter__(self):
self.console.disable_check_count[self.check_type] += 1
def __exit__(self, extype, value, traceback):
self.console.disable_check_count[self.check_type] -= 1
class ConsoleBase(object):
'''The interface through which test functions interact with the U-Boot
console. This primarily involves executing shell commands, capturing their
results, and checking for common error conditions. Some common utilities
are also provided too.'''
def __init__(self, log, config, max_fifo_fill):
'''Initialize a U-Boot console connection.
Can only usefully be called by sub-classes.
Args:
log: A mulptiplex_log.Logfile object, to which the U-Boot output
will be logged.
config: A configuration data structure, as built by conftest.py.
max_fifo_fill: The maximum number of characters to send to U-Boot
command-line before waiting for U-Boot to echo the characters
back. For UART-based HW without HW flow control, this value
should be set less than the UART RX FIFO size to avoid
overflow, assuming that U-Boot can't keep up with full-rate
traffic at the baud rate.
Returns:
Nothing.
'''
self.log = log
self.config = config
self.max_fifo_fill = max_fifo_fill
self.logstream = self.log.get_stream('console', sys.stdout)
# Array slice removes leading/trailing quotes
self.prompt = self.config.buildconfig['config_sys_prompt'][1:-1]
self.prompt_escaped = re.escape(self.prompt)
self.p = None
self.disable_check_count = {
'spl_signon': 0,
'main_signon': 0,
'unknown_command': 0,
'error_notification': 0,
}
self.at_prompt = False
self.at_prompt_logevt = None
self.ram_base = None
def close(self):
'''Terminate the connection to the U-Boot console.
This function is only useful once all interaction with U-Boot is
complete. Once this function is called, data cannot be sent to or
received from U-Boot.
Args:
None.
Returns:
Nothing.
'''
if self.p:
self.p.close()
self.logstream.close()
def run_command(self, cmd, wait_for_echo=True, send_nl=True,
wait_for_prompt=True):
'''Execute a command via the U-Boot console.
The command is always sent to U-Boot.
U-Boot echoes any command back to its output, and this function
typically waits for that to occur. The wait can be disabled by setting
wait_for_echo=False, which is useful e.g. when sending CTRL-C to
interrupt a long-running command such as "ums".
Command execution is typically triggered by sending a newline
character. This can be disabled by setting send_nl=False, which is
also useful when sending CTRL-C.
This function typically waits for the command to finish executing, and
returns the console output that it generated. This can be disabled by
setting wait_for_prompt=False, which is useful when invoking a long-
running command such as "ums".
Args:
cmd: The command to send.
wait_for_each: Boolean indicating whether to wait for U-Boot to
echo the command text back to its output.
send_nl: Boolean indicating whether to send a newline character
after the command string.
wait_for_prompt: Boolean indicating whether to wait for the
command prompt to be sent by U-Boot. This typically occurs
immediately after the command has been executed.
Returns:
If wait_for_prompt == False:
Nothing.
Else:
The output from U-Boot during command execution. In other
words, the text U-Boot emitted between the point it echod the
command string and emitted the subsequent command prompts.
'''
if self.at_prompt and \
self.at_prompt_logevt != self.logstream.logfile.cur_evt:
self.logstream.write(self.prompt, implicit=True)
bad_patterns = []
bad_pattern_ids = []
if (self.disable_check_count['spl_signon'] == 0 and
self.u_boot_spl_signon):
bad_patterns.append(self.u_boot_spl_signon_escaped)
bad_pattern_ids.append('SPL signon')
if self.disable_check_count['main_signon'] == 0:
bad_patterns.append(self.u_boot_main_signon_escaped)
bad_pattern_ids.append('U-Boot main signon')
if self.disable_check_count['unknown_command'] == 0:
bad_patterns.append(pattern_unknown_command)
bad_pattern_ids.append('Unknown command')
if self.disable_check_count['error_notification'] == 0:
bad_patterns.append(pattern_error_notification)
bad_pattern_ids.append('Error notification')
try:
self.at_prompt = False
if send_nl:
cmd += '\n'
while cmd:
# Limit max outstanding data, so UART FIFOs don't overflow
chunk = cmd[:self.max_fifo_fill]
cmd = cmd[self.max_fifo_fill:]
self.p.send(chunk)
if not wait_for_echo:
continue
chunk = re.escape(chunk)
chunk = chunk.replace('\\\n', '[\r\n]')
m = self.p.expect([chunk] + bad_patterns)
if m != 0:
self.at_prompt = False
raise Exception('Bad pattern found on console: ' +
bad_pattern_ids[m - 1])
if not wait_for_prompt:
return
m = self.p.expect([self.prompt_escaped] + bad_patterns)
if m != 0:
self.at_prompt = False
raise Exception('Bad pattern found on console: ' +
bad_pattern_ids[m - 1])
self.at_prompt = True
self.at_prompt_logevt = self.logstream.logfile.cur_evt
# Only strip \r\n; space/TAB might be significant if testing
# indentation.
return self.p.before.strip('\r\n')
except Exception as ex:
self.log.error(str(ex))
self.cleanup_spawn()
raise
def ctrlc(self):
'''Send a CTRL-C character to U-Boot.
This is useful in order to stop execution of long-running synchronous
commands such as "ums".
Args:
None.
Returns:
Nothing.
'''
self.log.action('Sending Ctrl-C')
self.run_command(chr(3), wait_for_echo=False, send_nl=False)
def wait_for(self, text):
'''Wait for a pattern to be emitted by U-Boot.
This is useful when a long-running command such as "dfu" is executing,
and it periodically emits some text that should show up at a specific
location in the log file.
Args:
text: The text to wait for; either a string (containing raw text,
not a regular expression) or an re object.
Returns:
Nothing.
'''
if type(text) == type(''):
text = re.escape(text)
self.p.expect([text])
def drain_console(self):
'''Read from and log the U-Boot console for a short time.
U-Boot's console output is only logged when the test code actively
waits for U-Boot to emit specific data. There are cases where tests
can fail without doing this. For example, if a test asks U-Boot to
enable USB device mode, then polls until a host-side device node
exists. In such a case, it is useful to log U-Boot's console output
in case U-Boot printed clues as to why the host-side even did not
occur. This function will do that.
Args:
None.
Returns:
Nothing.
'''
# If we are already not connected to U-Boot, there's nothing to drain.
# This should only happen when a previous call to run_command() or
# wait_for() failed (and hence the output has already been logged), or
# the system is shutting down.
if not self.p:
return
orig_timeout = self.p.timeout
try:
# Drain the log for a relatively short time.
self.p.timeout = 1000
# Wait for something U-Boot will likely never send. This will
# cause the console output to be read and logged.
self.p.expect(['This should never match U-Boot output'])
except u_boot_spawn.Timeout:
pass
finally:
self.p.timeout = orig_timeout
def ensure_spawned(self):
'''Ensure a connection to a correctly running U-Boot instance.
This may require spawning a new Sandbox process or resetting target
hardware, as defined by the implementation sub-class.
This is an internal function and should not be called directly.
Args:
None.
Returns:
Nothing.
'''
if self.p:
return
try:
self.at_prompt = False
self.log.action('Starting U-Boot')
self.p = self.get_spawn()
# Real targets can take a long time to scroll large amounts of
# text if LCD is enabled. This value may need tweaking in the
# future, possibly per-test to be optimal. This works for 'help'
# on board 'seaboard'.
self.p.timeout = 30000
self.p.logfile_read = self.logstream
if self.config.buildconfig.get('CONFIG_SPL', False) == 'y':
self.p.expect([pattern_u_boot_spl_signon])
self.u_boot_spl_signon = self.p.after
self.u_boot_spl_signon_escaped = re.escape(self.p.after)
else:
self.u_boot_spl_signon = None
self.p.expect([pattern_u_boot_main_signon])
self.u_boot_main_signon = self.p.after
self.u_boot_main_signon_escaped = re.escape(self.p.after)
build_idx = self.u_boot_main_signon.find(', Build:')
if build_idx == -1:
self.u_boot_version_string = self.u_boot_main_signon
else:
self.u_boot_version_string = self.u_boot_main_signon[:build_idx]
while True:
match = self.p.expect([self.prompt_escaped,
pattern_stop_autoboot_prompt])
if match == 1:
self.p.send(chr(3)) # CTRL-C
continue
break
self.at_prompt = True
self.at_prompt_logevt = self.logstream.logfile.cur_evt
except Exception as ex:
self.log.error(str(ex))
self.cleanup_spawn()
raise
def cleanup_spawn(self):
'''Shut down all interaction with the U-Boot instance.
This is used when an error is detected prior to re-establishing a
connection with a fresh U-Boot instance.
This is an internal function and should not be called directly.
Args:
None.
Returns:
Nothing.
'''
try:
if self.p:
self.p.close()
except:
pass
self.p = None
def validate_version_string_in_text(self, text):
'''Assert that a command's output includes the U-Boot signon message.
This is primarily useful for validating the "version" command without
duplicating the signon text regex in a test function.
Args:
text: The command output text to check.
Returns:
Nothing. An exception is raised if the validation fails.
'''
assert(self.u_boot_version_string in text)
def disable_check(self, check_type):
'''Temporarily disable an error check of U-Boot's output.
Create a new context manager (for use with the "with" statement) which
temporarily disables a particular console output error check.
Args:
check_type: The type of error-check to disable. Valid values may
be found in self.disable_check_count above.
Returns:
A context manager object.
'''
return ConsoleDisableCheck(self, check_type)
def find_ram_base(self):
'''Find the running U-Boot's RAM location.
Probe the running U-Boot to determine the address of the first bank
of RAM. This is useful for tests that test reading/writing RAM, or
load/save files that aren't associated with some standard address
typically represented in an environment variable such as
${kernel_addr_r}. The value is cached so that it only needs to be
actively read once.
Args:
None.
Returns:
The address of U-Boot's first RAM bank, as an integer.
'''
if self.config.buildconfig.get('config_cmd_bdi', 'n') != 'y':
pytest.skip('bdinfo command not supported')
if self.ram_base == -1:
pytest.skip('Previously failed to find RAM bank start')
if self.ram_base is not None:
return self.ram_base
with self.log.section('find_ram_base'):
response = self.run_command('bdinfo')
for l in response.split('\n'):
if '-> start' in l:
self.ram_base = int(l.split('=')[1].strip(), 16)
break
if self.ram_base is None:
self.ram_base = -1
raise Exception('Failed to find RAM bank start in `bdinfo`')
return self.ram_base