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Update qconfig's documentation to better reflect its new purpose in life. Signed-off-by: Simon Glass <sjg@chromium.org>
234 lines
8.3 KiB
ReStructuredText
234 lines
8.3 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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qconfig - Querying CONFIG options
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=================================
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It is not possible to see all the CONFIG options used by a board without
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building its `.config` file. This tool allows this to be done efficiently for
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all boards, or a subset, writing the results to a unified database file.
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This database can be queried, to find boards which used a certain combination
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of options, to aid in discovering Kconfig options which imply others.
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The tool also permits syncing of defconfigs, which corrects the ordering and
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drops options which are implied by others.
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Finally, it allows scanning the source code to look for inconsistencies in the
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use of Kconfig options.
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Installation
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------------
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You may need to install 'python3-asteval' for the 'asteval' module.
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How does it work?
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-----------------
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When building a database (`-b`), this tool runs configuration and builds
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include/autoconf.mk for every defconfig. The config options defined in Kconfig
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appear in the .config file (unless they are hidden because of unmet dependency.)
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On the other hand, the config options defined by board headers are seen
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in include/autoconf.mk.
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When resyncing defconfigs (`-s`) the .config is synced by "make savedefconfig"
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and the defconfig is updated with it.
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For faster processing, this tool is multi-threaded. It creates
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separate build directories where the out-of-tree build is run. The
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temporary build directories are automatically created and deleted as
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needed. The number of threads are chosen based on the number of the CPU
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cores of your system although you can change it via -j (--jobs) option.
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Note that `*.config` fragments are not supported.
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Toolchains
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----------
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Appropriate toolchains are necessary to generate include/autoconf.mk
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for all the architectures supported by U-Boot. Most of them are available
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at the kernel.org site. This tool uses the same tools as
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:doc:`../build/buildman`, so you can use `buildman --fetch-arch` to fetch
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toolchains.
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Examples
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--------
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To sync only X86 defconfigs::
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./tools/qconfig.py -s -d <(grep -l X86 configs/*)
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or::
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grep -l X86 configs/* | ./tools/qconfig.py -s -d -
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To process CONFIG_CMD_FPGAD only for a subset of configs based on path match::
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ls configs/{hrcon*,iocon*,strider*} | \
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./tools/qconfig.py -C CONFIG_CMD_FPGAD -d -
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Finding boards with particular CONFIG combinations
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--------------------------------------------------
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You can use `qconfig.py` to figure out which boards have a CONFIG enabled, or
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which do not. To use it, first build a database::
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./tools/qconfig.py -b
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Then you can run queries using the `-f` flag followed by a list of CONFIG terms.
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Each term is CONFIG name, with or without a tilde (~) prefix. The tool searches
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for boards which match the CONFIG name, or do not match if tilde is used. For
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example, to find boards which enabled CONFIG_SCSI but not CONFIG_BLK::
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tools/qconfig.py -f SCSI ~BLK
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3 matches
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pg_wcom_seli8_defconfig highbank_defconfig pg_wcom_expu1_defconfig
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Finding implied CONFIGs
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-----------------------
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Some CONFIG options can be implied by others and this can help to reduce
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the size of the defconfig files. For example, CONFIG_X86 implies
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CONFIG_CMD_IRQ, so we can put 'imply CMD_IRQ' under 'config X86' and
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all x86 boards will have that option, avoiding adding CONFIG_CMD_IRQ to
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each of the x86 defconfig files.
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This tool can help find such configs. To use it, first build a database::
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./tools/qconfig.py -b
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Then try to query it::
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./tools/qconfig.py -i CONFIG_I8042_KEYB
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CONFIG_I8042_KEYB found in 33/5155 defconfigs
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28 : CONFIG_X86
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28 : CONFIG_SA_PCIEX_LENGTH
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28 : CONFIG_HPET_ADDRESS
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28 : CONFIG_MAX_PIRQ_LINKS
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28 : CONFIG_I8254_TIMER
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28 : CONFIG_I8259_PIC
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28 : CONFIG_RAMBASE
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28 : CONFIG_IRQ_SLOT_COUNT
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28 : CONFIG_PCIE_ECAM_SIZE
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28 : CONFIG_APIC
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...
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This shows a list of config options which might imply CONFIG_I8042_KEYB along
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with how many defconfigs they cover. From this you can see that CONFIG_X86
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generally implies CONFIG_I8042_KEYB but not always (28 out of 35). Therefore,
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instead of adding CONFIG_I8042_KEYB to
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the defconfig of every x86 board, you could add a single imply line to the
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Kconfig file::
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config X86
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bool "x86 architecture"
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...
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imply CMD_EEPROM
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That will cover 28 defconfigs and you can perhaps find another condition that
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indicates that CONFIG_I8042_KEYB is not needed for the remaining 5 boards. Many
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of the options listed are not suitable as they are not related. E.g. it would be
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odd for CONFIG_RAMBASE to imply CONFIG_I8042_KEYB.
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Using this search you can reduce the size of qconfig patches.
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You can automatically add 'imply' statements in the Kconfig with the -a
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option::
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./tools/qconfig.py -s -i CONFIG_SCSI \
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-a CONFIG_ARCH_LS1021A,CONFIG_ARCH_LS1043A
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This will add 'imply SCSI' to the two CONFIG options mentioned, assuming that
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the database indicates that they do actually imply CONFIG_SCSI and do not
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already have an 'imply SCSI'.
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The output shows where the imply is added::
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18 : CONFIG_ARCH_LS1021A arch/arm/cpu/armv7/ls102xa/Kconfig:1
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13 : CONFIG_ARCH_LS1043A arch/arm/cpu/armv8/fsl-layerscape/Kconfig:11
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12 : CONFIG_ARCH_LS1046A arch/arm/cpu/armv8/fsl-layerscape/Kconfig:31
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The first number is the number of boards which can avoid having a special
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CONFIG_SCSI option in their defconfig file if this 'imply' is added.
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The location at the right is the Kconfig file and line number where the config
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appears. For example, adding 'imply CONFIG_SCSI' to the 'config ARCH_LS1021A'
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in arch/arm/cpu/armv7/ls102xa/Kconfig at line 1 will help 18 boards to reduce
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the size of their defconfig files.
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If you want to add an 'imply' to every imply config in the list, you can use::
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./tools/qconfig.py -s -i CONFIG_SCSI -a all
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To control which ones are displayed, use -I <list> where list is a list of
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options (use '-I help' to see possible options and their meaning).
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To skip showing you options that already have an 'imply' attached, use -A.
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When you have finished adding 'imply' options you can regenerate the
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defconfig files for affected boards with something like::
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git show --stat | ./tools/qconfig.py -s -d -
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This will regenerate only those defconfigs changed in the current commit.
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If you start with (say) 100 defconfigs being changed in the commit, and add
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a few 'imply' options as above, then regenerate, hopefully you can reduce the
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number of defconfigs changed in the commit.
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Available options
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-----------------
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--nocolour
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Disables colouring of output. This is normally used when writing to a
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terminal.
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-C, --commit
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Create a git commit with the changes when the operation is complete. A
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standard commit message is used which may need to be edited.
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-d, --defconfigs
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Specify a file containing a list of defconfigs to move. The defconfig
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files can be given with shell-style wildcards. Use '-' to read from stdin.
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-f, --find
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Find boards with a given config combination
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-n, --dry-run
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Perform a trial run that does not make any changes. It is useful to
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see what is going to happen before one actually runs it.
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-e, --exit-on-error
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Exit immediately if Make exits with a non-zero status while processing
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a defconfig file.
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-s, --force-sync
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Do "make savedefconfig" forcibly for all the defconfig files.
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If not specified, "make savedefconfig" only occurs for cases
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where at least one CONFIG was moved.
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-S, --spl
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Look for moved config options in spl/include/autoconf.mk instead of
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include/autoconf.mk. This is useful for moving options for SPL build
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because SPL related options (mostly prefixed with CONFIG_SPL\_) are
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sometimes blocked by CONFIG_SPL_BUILD ifdef conditionals.
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-j, --jobs
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Specify the number of threads to run simultaneously. If not specified,
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the number of threads is the same as the number of CPU cores.
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-r, --git-ref
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Specify the git ref to clone for building the autoconf.mk. If unspecified
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use the CWD. This is useful for when changes to the Kconfig affect the
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default values and you want to capture the state of the defconfig from
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before that change was in effect. If in doubt, specify a ref pre-Kconfig
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changes (use HEAD if Kconfig changes are not committed). Worst case it will
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take a bit longer to run, but will always do the right thing.
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-v, --verbose
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Show any build errors as boards are built
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To see the complete list of supported options, run::
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tools/qconfig.py -h
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