| # 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: ') |
| pattern_error_please_reset = re.compile('### ERROR ### Please RESET the board ###') |
| |
| PAT_ID = 0 |
| PAT_RE = 1 |
| |
| bad_pattern_defs = ( |
| ('spl_signon', pattern_u_boot_spl_signon), |
| ('main_signon', pattern_u_boot_main_signon), |
| ('stop_autoboot_prompt', pattern_stop_autoboot_prompt), |
| ('unknown_command', pattern_unknown_command), |
| ('error_notification', pattern_error_notification), |
| ('error_please_reset', pattern_error_please_reset), |
| ) |
| |
| 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 |
| self.console.eval_bad_patterns() |
| |
| def __exit__(self, extype, value, traceback): |
| self.console.disable_check_count[self.check_type] -= 1 |
| self.console.eval_bad_patterns() |
| |
| class ConsoleSetupTimeout(object): |
| """Context manager (for Python's with statement) that temporarily sets up |
| timeout for specific command. This is useful when execution time is greater |
| then default 30s.""" |
| |
| def __init__(self, console, timeout): |
| self.p = console.p |
| self.orig_timeout = self.p.timeout |
| self.p.timeout = timeout |
| |
| def __enter__(self): |
| return self |
| |
| def __exit__(self, extype, value, traceback): |
| self.p.timeout = self.orig_timeout |
| |
| 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_compiled = re.compile('^' + re.escape(self.prompt), re.MULTILINE) |
| self.p = None |
| self.disable_check_count = {pat[PAT_ID]: 0 for pat in bad_pattern_defs} |
| self.eval_bad_patterns() |
| |
| self.at_prompt = False |
| self.at_prompt_logevt = None |
| |
| def eval_bad_patterns(self): |
| self.bad_patterns = [pat[PAT_RE] for pat in bad_pattern_defs \ |
| if self.disable_check_count[pat[PAT_ID]] == 0] |
| self.bad_pattern_ids = [pat[PAT_ID] for pat in bad_pattern_defs \ |
| if self.disable_check_count[pat[PAT_ID]] == 0] |
| |
| 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_echo: 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) |
| |
| 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] + self.bad_patterns) |
| if m != 0: |
| self.at_prompt = False |
| raise Exception('Bad pattern found on console: ' + |
| self.bad_pattern_ids[m - 1]) |
| if not wait_for_prompt: |
| return |
| m = self.p.expect([self.prompt_compiled] + self.bad_patterns) |
| if m != 0: |
| self.at_prompt = False |
| raise Exception('Bad pattern found on console: ' + |
| self.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 |
| finally: |
| self.log.timestamp() |
| |
| def run_command_list(self, cmds): |
| """Run a list of commands. |
| |
| This is a helper function to call run_command() with default arguments |
| for each command in a list. |
| |
| Args: |
| cmd: List of commands (each a string). |
| Returns: |
| A list of output strings from each command, one element for each |
| command. |
| """ |
| output = [] |
| for cmd in cmds: |
| output.append(self.run_command(cmd)) |
| return output |
| |
| 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) |
| m = self.p.expect([text] + self.bad_patterns) |
| if m != 0: |
| raise Exception('Bad pattern found on console: ' + |
| self.bad_pattern_ids[m - 1]) |
| |
| 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.log.start_section('Starting U-Boot') |
| self.at_prompt = False |
| 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'. |
| if not self.config.gdbserver: |
| self.p.timeout = 30000 |
| self.p.logfile_read = self.logstream |
| bcfg = self.config.buildconfig |
| config_spl = bcfg.get('config_spl', 'n') == 'y' |
| config_spl_serial_support = bcfg.get('config_spl_serial_support', |
| 'n') == 'y' |
| env_spl_skipped = self.config.env.get('env__spl_skipped', |
| False) |
| if config_spl and config_spl_serial_support and not env_spl_skipped: |
| m = self.p.expect([pattern_u_boot_spl_signon] + |
| self.bad_patterns) |
| if m != 0: |
| raise Exception('Bad pattern found on SPL console: ' + |
| self.bad_pattern_ids[m - 1]) |
| m = self.p.expect([pattern_u_boot_main_signon] + self.bad_patterns) |
| if m != 0: |
| raise Exception('Bad pattern found on console: ' + |
| self.bad_pattern_ids[m - 1]) |
| self.u_boot_version_string = self.p.after |
| while True: |
| m = self.p.expect([self.prompt_compiled, |
| pattern_stop_autoboot_prompt] + self.bad_patterns) |
| if m == 0: |
| break |
| if m == 1: |
| self.p.send(' ') |
| continue |
| raise Exception('Bad pattern found on console: ' + |
| self.bad_pattern_ids[m - 2]) |
| 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 |
| finally: |
| self.log.timestamp() |
| self.log.end_section('Starting U-Boot') |
| |
| 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 restart_uboot(self): |
| """Shut down and restart U-Boot.""" |
| self.cleanup_spawn() |
| self.ensure_spawned() |
| |
| def get_spawn_output(self): |
| """Return the start-up output from U-Boot |
| |
| Returns: |
| The output produced by ensure_spawed(), as a string. |
| """ |
| if self.p: |
| return self.p.get_expect_output() |
| return 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 temporary_timeout(self, timeout): |
| """Temporarily set up different timeout for commands. |
| |
| Create a new context manager (for use with the "with" statement) which |
| temporarily change timeout. |
| |
| Args: |
| timeout: Time in milliseconds. |
| |
| Returns: |
| A context manager object. |
| """ |
| |
| return ConsoleSetupTimeout(self, timeout) |