aboutsummaryrefslogblamecommitdiffstats
path: root/tools/testing/ktest/config-bisect.pl
blob: b28feea7c363235f58d086c3d50fab90d92a2a55 (plain) (tree)
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
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657





















































                                                                             




                                                                             









                  
                 










































































































































































































































































































































































































































































































































































































                                                                                       



                          


































































                                                                           



                                                                        





































                                                                                         
#!/usr/bin/perl -w
#
# Copyright 2015 - Steven Rostedt, Red Hat Inc.
# Copyright 2017 - Steven Rostedt, VMware, Inc.
#
# Licensed under the terms of the GNU GPL License version 2
#

# usage:
#  config-bisect.pl [options] good-config bad-config [good|bad]
#

# Compares a good config to a bad config, then takes half of the diffs
# and produces a config that is somewhere between the good config and
# the bad config. That is, the resulting config will start with the
# good config and will try to make half of the differences of between
# the good and bad configs match the bad config. It tries because of
# dependencies between the two configs it may not be able to change
# exactly half of the configs that are different between the two config
# files.

# Here's a normal way to use it:
#
#  $ cd /path/to/linux/kernel
#  $ config-bisect.pl /path/to/good/config /path/to/bad/config

# This will now pull in good config (blowing away .config in that directory
# so do not make that be one of the good or bad configs), and then
# build the config with "make oldconfig" to make sure it matches the
# current kernel. It will then store the configs in that result for
# the good config. It does the same for the bad config as well.
# The algorithm will run, merging half of the differences between
# the two configs and building them with "make oldconfig" to make sure
# the result changes (dependencies may reset changes the tool had made).
# It then copies the result of its good config to /path/to/good/config.tmp
# and the bad config to /path/to/bad/config.tmp (just appends ".tmp" to the
# files passed in). And the ".config" that you should test will be in
# directory

# After the first run, determine if the result is good or bad then
# run the same command appending the result

# For good results:
#  $ config-bisect.pl /path/to/good/config /path/to/bad/config good

# For bad results:
#  $ config-bisect.pl /path/to/good/config /path/to/bad/config bad

# Do not change the good-config or bad-config, config-bisect.pl will
# copy the good-config to a temp file with the same name as good-config
# but with a ".tmp" after it. It will do the same with the bad-config.

# If "good" or "bad" is not stated at the end, it will copy the good and
# bad configs to the .tmp versions. If a .tmp version already exists, it will
# warn before writing over them (-r will not warn, and just write over them).
# If the last config is labeled "good", then it will copy it to the good .tmp
# version. If the last config is labeled "bad", it will copy it to the bad
# .tmp version. It will continue this until it can not merge the two any more
# without the result being equal to either the good or bad .tmp configs.

my $start = 0;
my $val = "";

my $pwd = `pwd`;
chomp $pwd;
my $tree = $pwd;
my $build;

my $output_config;
my $reset_bisect;

sub usage {
    print << "EOF"

usage: config-bisect.pl [-l linux-tree][-b build-dir] good-config bad-config [good|bad]
  -l [optional] define location of linux-tree (default is current directory)
  -b [optional] define location to build (O=build-dir) (default is linux-tree)
  good-config the config that is considered good
  bad-config the config that does not work
  "good" add this if the last run produced a good config
  "bad" add this if the last run produced a bad config
  If "good" or "bad" is not specified, then it is the start of a new bisect

  Note, each run will create copy of good and bad configs with ".tmp" appended.

EOF
;

    exit(-1);
}

sub doprint {
    print @_;
}

sub dodie {
    doprint "CRITICAL FAILURE... ", @_, "\n";

    die @_, "\n";
}

sub expand_path {
    my ($file) = @_;

    if ($file =~ m,^/,) {
	return $file;
    }
    return "$pwd/$file";
}

sub read_prompt {
    my ($cancel, $prompt) = @_;

    my $ans;

    for (;;) {
	if ($cancel) {
	    print "$prompt [y/n/C] ";
	} else {
	    print "$prompt [y/N] ";
	}
	$ans = <STDIN>;
	chomp $ans;
	if ($ans =~ /^\s*$/) {
	    if ($cancel) {
		$ans = "c";
	    } else {
		$ans = "n";
	    }
	}
	last if ($ans =~ /^y$/i || $ans =~ /^n$/i);
	if ($cancel) {
	    last if ($ans =~ /^c$/i);
	    print "Please answer either 'y', 'n' or 'c'.\n";
	} else {
	    print "Please answer either 'y' or 'n'.\n";
	}
    }
    if ($ans =~ /^c/i) {
	exit;
    }
    if ($ans !~ /^y$/i) {
	return 0;
    }
    return 1;
}

sub read_yn {
    my ($prompt) = @_;

    return read_prompt 0, $prompt;
}

sub read_ync {
    my ($prompt) = @_;

    return read_prompt 1, $prompt;
}

sub run_command {
    my ($command, $redirect) = @_;
    my $start_time;
    my $end_time;
    my $dord = 0;
    my $pid;

    $start_time = time;

    doprint("$command ... ");

    $pid = open(CMD, "$command 2>&1 |") or
	dodie "unable to exec $command";

    if (defined($redirect)) {
	open (RD, ">$redirect") or
	    dodie "failed to write to redirect $redirect";
	$dord = 1;
    }

    while (<CMD>) {
	print RD  if ($dord);
    }

    waitpid($pid, 0);
    my $failed = $?;

    close(CMD);
    close(RD)  if ($dord);

    $end_time = time;
    my $delta = $end_time - $start_time;

    if ($delta == 1) {
	doprint "[1 second] ";
    } else {
	doprint "[$delta seconds] ";
    }

    if ($failed) {
	doprint "FAILED!\n";
    } else {
	doprint "SUCCESS\n";
    }

    return !$failed;
}

###### CONFIG BISECT ######

# config_ignore holds the configs that were set (or unset) for
# a good config and we will ignore these configs for the rest
# of a config bisect. These configs stay as they were.
my %config_ignore;

# config_set holds what all configs were set as.
my %config_set;

# config_off holds the set of configs that the bad config had disabled.
# We need to record them and set them in the .config when running
# olddefconfig, because olddefconfig keeps the defaults.
my %config_off;

# config_off_tmp holds a set of configs to turn off for now
my @config_off_tmp;

# config_list is the set of configs that are being tested
my %config_list;
my %null_config;

my %dependency;

my $make;

sub make_oldconfig {

    if (!run_command "$make olddefconfig") {
	# Perhaps olddefconfig doesn't exist in this version of the kernel
	# try oldnoconfig
	doprint "olddefconfig failed, trying make oldnoconfig\n";
	if (!run_command "$make oldnoconfig") {
	    doprint "oldnoconfig failed, trying yes '' | make oldconfig\n";
	    # try a yes '' | oldconfig
	    run_command "yes '' | $make oldconfig" or
		dodie "failed make config oldconfig";
	}
    }
}

sub assign_configs {
    my ($hash, $config) = @_;

    doprint "Reading configs from $config\n";

    open (IN, $config)
	or dodie "Failed to read $config";

    while (<IN>) {
	chomp;
	if (/^((CONFIG\S*)=.*)/) {
	    ${$hash}{$2} = $1;
	} elsif (/^(# (CONFIG\S*) is not set)/) {
	    ${$hash}{$2} = $1;
	}
    }

    close(IN);
}

sub process_config_ignore {
    my ($config) = @_;

    assign_configs \%config_ignore, $config;
}

sub get_dependencies {
    my ($config) = @_;

    my $arr = $dependency{$config};
    if (!defined($arr)) {
	return ();
    }

    my @deps = @{$arr};

    foreach my $dep (@{$arr}) {
	print "ADD DEP $dep\n";
	@deps = (@deps, get_dependencies $dep);
    }

    return @deps;
}

sub save_config {
    my ($pc, $file) = @_;

    my %configs = %{$pc};

    doprint "Saving configs into $file\n";

    open(OUT, ">$file") or dodie "Can not write to $file";

    foreach my $config (keys %configs) {
	print OUT "$configs{$config}\n";
    }
    close(OUT);
}

sub create_config {
    my ($name, $pc) = @_;

    doprint "Creating old config from $name configs\n";

    save_config $pc, $output_config;

    make_oldconfig;
}

# compare two config hashes, and return configs with different vals.
# It returns B's config values, but you can use A to see what A was.
sub diff_config_vals {
    my ($pa, $pb) = @_;

    # crappy Perl way to pass in hashes.
    my %a = %{$pa};
    my %b = %{$pb};

    my %ret;

    foreach my $item (keys %a) {
	if (defined($b{$item}) && $b{$item} ne $a{$item}) {
	    $ret{$item} = $b{$item};
	}
    }

    return %ret;
}

# compare two config hashes and return the configs in B but not A
sub diff_configs {
    my ($pa, $pb) = @_;

    my %ret;

    # crappy Perl way to pass in hashes.
    my %a = %{$pa};
    my %b = %{$pb};

    foreach my $item (keys %b) {
	if (!defined($a{$item})) {
	    $ret{$item} = $b{$item};
	}
    }

    return %ret;
}

# return if two configs are equal or not
# 0 is equal +1 b has something a does not
# +1 if a and b have a different item.
# -1 if a has something b does not
sub compare_configs {
    my ($pa, $pb) = @_;

    my %ret;

    # crappy Perl way to pass in hashes.
    my %a = %{$pa};
    my %b = %{$pb};

    foreach my $item (keys %b) {
	if (!defined($a{$item})) {
	    return 1;
	}
	if ($a{$item} ne $b{$item}) {
	    return 1;
	}
    }

    foreach my $item (keys %a) {
	if (!defined($b{$item})) {
	    return -1;
	}
    }

    return 0;
}

sub process_failed {
    my ($config) = @_;

    doprint "\n\n***************************************\n";
    doprint "Found bad config: $config\n";
    doprint "***************************************\n\n";
}

sub process_new_config {
    my ($tc, $nc, $gc, $bc) = @_;

    my %tmp_config = %{$tc};
    my %good_configs = %{$gc};
    my %bad_configs = %{$bc};

    my %new_configs;

    my $runtest = 1;
    my $ret;

    create_config "tmp_configs", \%tmp_config;
    assign_configs \%new_configs, $output_config;

    $ret = compare_configs \%new_configs, \%bad_configs;
    if (!$ret) {
	doprint "New config equals bad config, try next test\n";
	$runtest = 0;
    }

    if ($runtest) {
	$ret = compare_configs \%new_configs, \%good_configs;
	if (!$ret) {
	    doprint "New config equals good config, try next test\n";
	    $runtest = 0;
	}
    }

    %{$nc} = %new_configs;

    return $runtest;
}

sub convert_config {
    my ($config) = @_;

    if ($config =~ /^# (.*) is not set/) {
	$config = "$1=n";
    }

    $config =~ s/^CONFIG_//;
    return $config;
}

sub print_config {
    my ($sym, $config) = @_;

    $config = convert_config $config;
    doprint "$sym$config\n";
}

sub print_config_compare {
    my ($good_config, $bad_config) = @_;

    $good_config = convert_config $good_config;
    $bad_config = convert_config $bad_config;

    my $good_value = $good_config;
    my $bad_value = $bad_config;
    $good_value =~ s/(.*)=//;
    my $config = $1;

    $bad_value =~ s/.*=//;

    doprint " $config $good_value -> $bad_value\n";
}

# Pass in:
# $phalf: half of the configs names you want to add
# $oconfigs: The orginial configs to start with
# $sconfigs: The source to update $oconfigs with (from $phalf)
# $which: The name of which half that is updating (top / bottom)
# $type: The name of the source type (good / bad)
sub make_half {
    my ($phalf, $oconfigs, $sconfigs, $which, $type) = @_;

    my @half = @{$phalf};
    my %orig_configs = %{$oconfigs};
    my %source_configs = %{$sconfigs};

    my %tmp_config = %orig_configs;

    doprint "Settings bisect with $which half of $type configs:\n";
    foreach my $item (@half) {
	doprint "Updating $item to $source_configs{$item}\n";
	$tmp_config{$item} = $source_configs{$item};
    }

    return %tmp_config;
}

sub run_config_bisect {
    my ($pgood, $pbad) = @_;

    my %good_configs = %{$pgood};
    my %bad_configs = %{$pbad};

    my %diff_configs = diff_config_vals \%good_configs, \%bad_configs;
    my %b_configs = diff_configs \%good_configs, \%bad_configs;
    my %g_configs = diff_configs \%bad_configs, \%good_configs;

    # diff_arr is what is in both good and bad but are different (y->n)
    my @diff_arr = keys %diff_configs;
    my $len_diff = $#diff_arr + 1;

    # b_arr is what is in bad but not in good (has depends)
    my @b_arr = keys %b_configs;
    my $len_b = $#b_arr + 1;

    # g_arr is what is in good but not in bad
    my @g_arr = keys %g_configs;
    my $len_g = $#g_arr + 1;

    my $runtest = 0;
    my %new_configs;
    my $ret;

    # Look at the configs that are different between good and bad.
    # This does not include those that depend on other configs
    #  (configs depending on other configs that are not set would
    #   not show up even as a "# CONFIG_FOO is not set"


    doprint "# of configs to check:             $len_diff\n";
    doprint "# of configs showing only in good: $len_g\n";
    doprint "# of configs showing only in bad:  $len_b\n";

    if ($len_diff > 0) {
	# Now test for different values

	doprint "Configs left to check:\n";
	doprint "  Good Config\t\t\tBad Config\n";
	doprint "  -----------\t\t\t----------\n";
	foreach my $item (@diff_arr) {
	    doprint "  $good_configs{$item}\t$bad_configs{$item}\n";
	}

	my $half = int($#diff_arr / 2);
	my @tophalf = @diff_arr[0 .. $half];

	doprint "Set tmp config to be good config with some bad config values\n";

	my %tmp_config = make_half \@tophalf, \%good_configs,
	    \%bad_configs, "top", "bad";

	$runtest = process_new_config \%tmp_config, \%new_configs,
			    \%good_configs, \%bad_configs;

	if (!$runtest) {
	    doprint "Set tmp config to be bad config with some good config values\n";

	    my %tmp_config = make_half \@tophalf, \%bad_configs,
		\%good_configs, "top", "good";

	    $runtest = process_new_config \%tmp_config, \%new_configs,
		\%good_configs, \%bad_configs;
	}
    }

    if (!$runtest && $len_diff > 0) {
	# do the same thing, but this time with bottom half

	my $half = int($#diff_arr / 2);
	my @bottomhalf = @diff_arr[$half+1 .. $#diff_arr];

	doprint "Set tmp config to be good config with some bad config values\n";

	my %tmp_config = make_half \@bottomhalf, \%good_configs,
	    \%bad_configs, "bottom", "bad";

	$runtest = process_new_config \%tmp_config, \%new_configs,
			    \%good_configs, \%bad_configs;

	if (!$runtest) {
	    doprint "Set tmp config to be bad config with some good config values\n";

	    my %tmp_config = make_half \@bottomhalf, \%bad_configs,
		\%good_configs, "bottom", "good";

	    $runtest = process_new_config \%tmp_config, \%new_configs,
		\%good_configs, \%bad_configs;
	}
    }

    if ($runtest) {
	make_oldconfig;
	doprint "READY TO TEST .config IN $build\n";
	return 0;
    }

    doprint "\n%%%%%%%% FAILED TO FIND SINGLE BAD CONFIG %%%%%%%%\n";
    doprint "Hmm, can't make any more changes without making good == bad?\n";
    doprint "Difference between good (+) and bad (-)\n";

    foreach my $item (keys %bad_configs) {
	if (!defined($good_configs{$item})) {
	    print_config "-", $bad_configs{$item};
	}
    }

    foreach my $item (keys %good_configs) {
	next if (!defined($bad_configs{$item}));
	if ($good_configs{$item} ne $bad_configs{$item}) {
	    print_config_compare $good_configs{$item}, $bad_configs{$item};
	}
    }

    foreach my $item (keys %good_configs) {
	if (!defined($bad_configs{$item})) {
	    print_config "+", $good_configs{$item};
	}
    }
    return -1;
}

sub config_bisect {
    my ($good_config, $bad_config) = @_;
    my $ret;

    my %good_configs;
    my %bad_configs;
    my %tmp_configs;

    doprint "Run good configs through make oldconfig\n";
    assign_configs \%tmp_configs, $good_config;
    create_config "$good_config", \%tmp_configs;
    assign_configs \%good_configs, $output_config;

    doprint "Run bad configs through make oldconfig\n";
    assign_configs \%tmp_configs, $bad_config;
    create_config "$bad_config", \%tmp_configs;
    assign_configs \%bad_configs, $output_config;

    save_config \%good_configs, $good_config;
    save_config \%bad_configs, $bad_config;

    return run_config_bisect \%good_configs, \%bad_configs;
}

while ($#ARGV >= 0) {
    if ($ARGV[0] !~ m/^-/) {
	last;
    }
    my $opt = shift @ARGV;

    if ($opt eq "-b") {
	$val = shift @ARGV;
	if (!defined($val)) {
	    die "-b requires value\n";
	}
	$build = $val;
    }

    elsif ($opt eq "-l") {
	$val = shift @ARGV;
	if (!defined($val)) {
	    die "-l requires value\n";
	}
	$tree = $val;
    }

    elsif ($opt eq "-r") {
	$reset_bisect = 1;
    }

    elsif ($opt eq "-h") {
	usage;
    }

    else {
	die "Unknow option $opt\n";
    }
}

$build = $tree if (!defined($build));

$tree = expand_path $tree;
$build = expand_path $build;

if ( ! -d $tree ) {
    die "$tree not a directory\n";
}

if ( ! -d $build ) {
    die "$build not a directory\n";
}

usage if $#ARGV < 1;

if ($#ARGV == 1) {
    $start = 1;
} elsif ($#ARGV == 2) {
    $val = $ARGV[2];
    if ($val ne "good" && $val ne "bad") {
	die "Unknown command '$val', bust be either \"good\" or \"bad\"\n";
    }
} else {
    usage;
}

my $good_start = expand_path $ARGV[0];
my $bad_start = expand_path $ARGV[1];

my $good = "$good_start.tmp";
my $bad = "$bad_start.tmp";

$make = "make";

if ($build ne $tree) {
    $make = "make O=$build"
}

$output_config = "$build/.config";

if ($start) {
    if ( ! -f $good_start ) {
	die "$good_start not found\n";
    }
    if ( ! -f $bad_start ) {
	die "$bad_start not found\n";
    }
    if ( -f $good || -f $bad ) {
	my $p = "";

	if ( -f $good ) {
	    $p = "$good exists\n";
	}

	if ( -f $bad ) {
	    $p = "$p$bad exists\n";
	}

	if (!defined($reset_bisect)) {
	    if (!read_yn "${p}Overwrite and start new bisect anyway?") {
		exit (-1);
	    }
	}
    }
    run_command "cp $good_start $good" or die "failed to copy to $good\n";
    run_command "cp $bad_start $bad" or die "faield to copy to $bad\n";
} else {
    if ( ! -f $good ) {
	die "Can not find file $good\n";
    }
    if ( ! -f $bad ) {
	die "Can not find file $bad\n";
    }
    if ($val eq "good") {
	run_command "cp $output_config $good" or die "failed to copy $config to $good\n";
    } elsif ($val eq "bad") {
	run_command "cp $output_config $bad" or die "failed to copy $config to $bad\n";
    }
}

chdir $tree || die "can't change directory to $tree";

my $ret = config_bisect $good, $bad;

if (!$ret) {
    exit(0);
}

if ($ret > 0) {
    doprint "Cleaning temp files\n";
    run_command "rm $good";
    run_command "rm $bad";
    exit(1);
} else {
    doprint "See good and bad configs for details:\n";
    doprint "good: $good\n";
    doprint "bad:  $bad\n";
    doprint "%%%%%%%% FAILED TO FIND SINGLE BAD CONFIG %%%%%%%%\n";
}
exit(2);