summaryrefslogtreecommitdiff
path: root/test/py/u_boot_console_base.py
blob: 815fa64d5ff344ba7dc6470e714862d6f59c568c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
# 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_escaped = re.escape(self.prompt)
        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_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)

        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_escaped] + 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

    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 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_escaped,
                    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.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 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)