1 # Copyright (c) 2015 Stephen Warren
2 # Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
4 # SPDX-License-Identifier: GPL-2.0
6 # Common logic to interact with U-Boot via the console. This class provides
7 # the interface that tests use to execute U-Boot shell commands and wait for
8 # their results. Sub-classes exist to perform board-type-specific setup
9 # operations, such as spawning a sub-process for Sandbox, or attaching to the
10 # serial console of real hardware.
12 import multiplexed_log
19 # Regexes for text we expect U-Boot to send to the console.
20 pattern_u_boot_spl_signon = re.compile('(U-Boot SPL \\d{4}\\.\\d{2}-[^\r\n]*)')
21 pattern_u_boot_main_signon = re.compile('(U-Boot \\d{4}\\.\\d{2}-[^\r\n]*)')
22 pattern_stop_autoboot_prompt = re.compile('Hit any key to stop autoboot: ')
23 pattern_unknown_command = re.compile('Unknown command \'.*\' - try \'help\'')
24 pattern_error_notification = re.compile('## Error: ')
26 class ConsoleDisableCheck(object):
27 '''Context manager (for Python's with statement) that temporarily disables
28 the specified console output error check. This is useful when deliberately
29 executing a command that is known to trigger one of the error checks, in
30 order to test that the error condition is actually raised. This class is
31 used internally by ConsoleBase::disable_check(); it is not intended for
34 def __init__(self, console, check_type):
35 self.console = console
36 self.check_type = check_type
39 self.console.disable_check_count[self.check_type] += 1
41 def __exit__(self, extype, value, traceback):
42 self.console.disable_check_count[self.check_type] -= 1
44 class ConsoleBase(object):
45 '''The interface through which test functions interact with the U-Boot
46 console. This primarily involves executing shell commands, capturing their
47 results, and checking for common error conditions. Some common utilities
48 are also provided too.'''
50 def __init__(self, log, config, max_fifo_fill):
51 '''Initialize a U-Boot console connection.
53 Can only usefully be called by sub-classes.
56 log: A mulptiplex_log.Logfile object, to which the U-Boot output
58 config: A configuration data structure, as built by conftest.py.
59 max_fifo_fill: The maximum number of characters to send to U-Boot
60 command-line before waiting for U-Boot to echo the characters
61 back. For UART-based HW without HW flow control, this value
62 should be set less than the UART RX FIFO size to avoid
63 overflow, assuming that U-Boot can't keep up with full-rate
64 traffic at the baud rate.
72 self.max_fifo_fill = max_fifo_fill
74 self.logstream = self.log.get_stream('console', sys.stdout)
76 # Array slice removes leading/trailing quotes
77 self.prompt = self.config.buildconfig['config_sys_prompt'][1:-1]
78 self.prompt_escaped = re.escape(self.prompt)
80 self.disable_check_count = {
84 'error_notification': 0,
87 self.at_prompt = False
88 self.at_prompt_logevt = None
91 '''Terminate the connection to the U-Boot console.
93 This function is only useful once all interaction with U-Boot is
94 complete. Once this function is called, data cannot be sent to or
106 self.logstream.close()
108 def run_command(self, cmd, wait_for_echo=True, send_nl=True,
109 wait_for_prompt=True):
110 '''Execute a command via the U-Boot console.
112 The command is always sent to U-Boot.
114 U-Boot echoes any command back to its output, and this function
115 typically waits for that to occur. The wait can be disabled by setting
116 wait_for_echo=False, which is useful e.g. when sending CTRL-C to
117 interrupt a long-running command such as "ums".
119 Command execution is typically triggered by sending a newline
120 character. This can be disabled by setting send_nl=False, which is
121 also useful when sending CTRL-C.
123 This function typically waits for the command to finish executing, and
124 returns the console output that it generated. This can be disabled by
125 setting wait_for_prompt=False, which is useful when invoking a long-
126 running command such as "ums".
129 cmd: The command to send.
130 wait_for_each: Boolean indicating whether to wait for U-Boot to
131 echo the command text back to its output.
132 send_nl: Boolean indicating whether to send a newline character
133 after the command string.
134 wait_for_prompt: Boolean indicating whether to wait for the
135 command prompt to be sent by U-Boot. This typically occurs
136 immediately after the command has been executed.
139 If wait_for_prompt == False:
142 The output from U-Boot during command execution. In other
143 words, the text U-Boot emitted between the point it echod the
144 command string and emitted the subsequent command prompts.
147 if self.at_prompt and \
148 self.at_prompt_logevt != self.logstream.logfile.cur_evt:
149 self.logstream.write(self.prompt, implicit=True)
153 if (self.disable_check_count['spl_signon'] == 0 and
154 self.u_boot_spl_signon):
155 bad_patterns.append(self.u_boot_spl_signon_escaped)
156 bad_pattern_ids.append('SPL signon')
157 if self.disable_check_count['main_signon'] == 0:
158 bad_patterns.append(self.u_boot_main_signon_escaped)
159 bad_pattern_ids.append('U-Boot main signon')
160 if self.disable_check_count['unknown_command'] == 0:
161 bad_patterns.append(pattern_unknown_command)
162 bad_pattern_ids.append('Unknown command')
163 if self.disable_check_count['error_notification'] == 0:
164 bad_patterns.append(pattern_error_notification)
165 bad_pattern_ids.append('Error notification')
167 self.at_prompt = False
171 # Limit max outstanding data, so UART FIFOs don't overflow
172 chunk = cmd[:self.max_fifo_fill]
173 cmd = cmd[self.max_fifo_fill:]
175 if not wait_for_echo:
177 chunk = re.escape(chunk)
178 chunk = chunk.replace('\\\n', '[\r\n]')
179 m = self.p.expect([chunk] + bad_patterns)
181 self.at_prompt = False
182 raise Exception('Bad pattern found on console: ' +
183 bad_pattern_ids[m - 1])
184 if not wait_for_prompt:
186 m = self.p.expect([self.prompt_escaped] + bad_patterns)
188 self.at_prompt = False
189 raise Exception('Bad pattern found on console: ' +
190 bad_pattern_ids[m - 1])
191 self.at_prompt = True
192 self.at_prompt_logevt = self.logstream.logfile.cur_evt
193 # Only strip \r\n; space/TAB might be significant if testing
195 return self.p.before.strip('\r\n')
196 except Exception as ex:
197 self.log.error(str(ex))
202 '''Send a CTRL-C character to U-Boot.
204 This is useful in order to stop execution of long-running synchronous
205 commands such as "ums".
214 self.log.action('Sending Ctrl-C')
215 self.run_command(chr(3), wait_for_echo=False, send_nl=False)
217 def wait_for(self, text):
218 '''Wait for a pattern to be emitted by U-Boot.
220 This is useful when a long-running command such as "dfu" is executing,
221 and it periodically emits some text that should show up at a specific
222 location in the log file.
225 text: The text to wait for; either a string (containing raw text,
226 not a regular expression) or an re object.
232 if type(text) == type(''):
233 text = re.escape(text)
234 self.p.expect([text])
236 def drain_console(self):
237 '''Read from and log the U-Boot console for a short time.
239 U-Boot's console output is only logged when the test code actively
240 waits for U-Boot to emit specific data. There are cases where tests
241 can fail without doing this. For example, if a test asks U-Boot to
242 enable USB device mode, then polls until a host-side device node
243 exists. In such a case, it is useful to log U-Boot's console output
244 in case U-Boot printed clues as to why the host-side even did not
245 occur. This function will do that.
254 # If we are already not connected to U-Boot, there's nothing to drain.
255 # This should only happen when a previous call to run_command() or
256 # wait_for() failed (and hence the output has already been logged), or
257 # the system is shutting down.
261 orig_timeout = self.p.timeout
263 # Drain the log for a relatively short time.
264 self.p.timeout = 1000
265 # Wait for something U-Boot will likely never send. This will
266 # cause the console output to be read and logged.
267 self.p.expect(['This should never match U-Boot output'])
268 except u_boot_spawn.Timeout:
271 self.p.timeout = orig_timeout
273 def ensure_spawned(self):
274 '''Ensure a connection to a correctly running U-Boot instance.
276 This may require spawning a new Sandbox process or resetting target
277 hardware, as defined by the implementation sub-class.
279 This is an internal function and should not be called directly.
291 self.at_prompt = False
292 self.log.action('Starting U-Boot')
293 self.p = self.get_spawn()
294 # Real targets can take a long time to scroll large amounts of
295 # text if LCD is enabled. This value may need tweaking in the
296 # future, possibly per-test to be optimal. This works for 'help'
297 # on board 'seaboard'.
298 self.p.timeout = 30000
299 self.p.logfile_read = self.logstream
300 if self.config.buildconfig.get('CONFIG_SPL', False) == 'y':
301 self.p.expect([pattern_u_boot_spl_signon])
302 self.u_boot_spl_signon = self.p.after
303 self.u_boot_spl_signon_escaped = re.escape(self.p.after)
305 self.u_boot_spl_signon = None
306 self.p.expect([pattern_u_boot_main_signon])
307 self.u_boot_main_signon = self.p.after
308 self.u_boot_main_signon_escaped = re.escape(self.p.after)
309 build_idx = self.u_boot_main_signon.find(', Build:')
311 self.u_boot_version_string = self.u_boot_main_signon
313 self.u_boot_version_string = self.u_boot_main_signon[:build_idx]
315 match = self.p.expect([self.prompt_escaped,
316 pattern_stop_autoboot_prompt])
318 self.p.send(chr(3)) # CTRL-C
321 self.at_prompt = True
322 self.at_prompt_logevt = self.logstream.logfile.cur_evt
323 except Exception as ex:
324 self.log.error(str(ex))
328 def cleanup_spawn(self):
329 '''Shut down all interaction with the U-Boot instance.
331 This is used when an error is detected prior to re-establishing a
332 connection with a fresh U-Boot instance.
334 This is an internal function and should not be called directly.
350 def validate_version_string_in_text(self, text):
351 '''Assert that a command's output includes the U-Boot signon message.
353 This is primarily useful for validating the "version" command without
354 duplicating the signon text regex in a test function.
357 text: The command output text to check.
360 Nothing. An exception is raised if the validation fails.
363 assert(self.u_boot_version_string in text)
365 def disable_check(self, check_type):
366 '''Temporarily disable an error check of U-Boot's output.
368 Create a new context manager (for use with the "with" statement) which
369 temporarily disables a particular console output error check.
372 check_type: The type of error-check to disable. Valid values may
373 be found in self.disable_check_count above.
376 A context manager object.
379 return ConsoleDisableCheck(self, check_type)