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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/ktest/config-bisect.pl | |
parent | Initial commit. (diff) | |
download | linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.tar.xz linux-5d1646d90e1f2cceb9f0828f4b28318cd0ec7744.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/ktest/config-bisect.pl')
-rwxr-xr-x | tools/testing/ktest/config-bisect.pl | 769 |
1 files changed, 769 insertions, 0 deletions
diff --git a/tools/testing/ktest/config-bisect.pl b/tools/testing/ktest/config-bisect.pl new file mode 100755 index 000000000..6fd864935 --- /dev/null +++ b/tools/testing/ktest/config-bisect.pl @@ -0,0 +1,769 @@ +#!/usr/bin/perl -w +# SPDX-License-Identifier: GPL-2.0-only +# +# Copyright 2015 - Steven Rostedt, Red Hat Inc. +# Copyright 2017 - Steven Rostedt, VMware, Inc. +# + +# 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 "Unknown 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 "failed 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); |