[PATCH v3 2/6] treewide: bcb: move ab_select command to bcb subcommands

Dmitry Rokosov ddrokosov at salutedevices.com
Tue Oct 15 15:26:31 CEST 2024


Hi Mattijs,

On Tue, Oct 15, 2024 at 02:10:10PM +0200, Mattijs Korpershoek wrote:
> Hi Simon, Dmitry
> 
> On lun., oct. 14, 2024 at 15:06, Simon Glass <sjg at chromium.org> wrote:
> 
> > Hi Dmitry,
> >
> > On Mon, 14 Oct 2024 at 14:38, Dmitry Rokosov
> > <ddrokosov at salutedevices.com> wrote:
> >>
> >> Hello Mattijs,
> >>
> >> On Sat, Oct 12, 2024 at 10:49:08AM +0200, Mattijs Korpershoek wrote:
> >> > Hi Dmitry,
> >> >
> >> > On ven., oct. 11, 2024 at 21:00, Dmitry Rokosov <ddrokosov at salutedevices.com> wrote:
> >> >
> >> > > On Fri, Oct 11, 2024 at 04:20:39PM +0200, Mattijs Korpershoek wrote:
> >> > >> On ven., oct. 11, 2024 at 15:30, "Mattijs Korpershoek via groups.io" <mkorpershoek=baylibre.com at groups.io> wrote:
> >> > >>
> >> > >> > Hi Dmitry,
> >> > >> >
> >> > >> > Thank you for the patch.
> >> > >> >
> >> > >> > On mar., oct. 08, 2024 at 23:18, Dmitry Rokosov <ddrokosov at salutedevices.com> wrote:
> >> > >> >
> >> > >> >> To enhance code organization, it is beneficial to consolidate all A/B
> >> > >> >> BCB management routines into a single super-command.
> >> > >> >> The 'bcb' command is an excellent candidate for this purpose.
> >> > >> >>
> >> > >> >> This patch integrates the separate 'ab_select' command into the 'bcb'
> >> > >> >> group as the 'ab_select' subcommand, maintaining the same parameter list
> >> > >> >> for consistency.
> >> > >> >>
> >> > >> >> Signed-off-by: Dmitry Rokosov <ddrokosov at salutedevices.com>
> >> > >> >> ---
> >> > >> >>  MAINTAINERS                               |  1 -
> >> > >> >>  cmd/Kconfig                               | 15 +------
> >> > >> >>  cmd/Makefile                              |  1 -
> >> > >> >>  cmd/ab_select.c                           | 66 -------------------------------
> >> > >> >>  cmd/bcb.c                                 | 63 +++++++++++++++++++++++++++++
> >> > >> >>  configs/am57xx_hs_evm_usb_defconfig       |  1 -
> >> > >> >>  configs/khadas-vim3_android_ab_defconfig  |  1 -
> >> > >> >>  configs/khadas-vim3l_android_ab_defconfig |  1 -
> >> > >> >>  configs/sandbox64_defconfig               |  4 +-
> >> > >> >>  configs/sandbox_defconfig                 |  4 +-
> >> > >> >>  doc/android/ab.rst                        | 12 +++---
> >> > >> >>  include/configs/khadas-vim3_android.h     |  2 +-
> >> > >> >>  include/configs/khadas-vim3l_android.h    |  2 +-
> >> > >> >>  include/configs/meson64_android.h         |  4 +-
> >> > >> >>  include/configs/ti_omap5_common.h         |  4 +-
> >> > >> >>  test/py/tests/test_android/test_ab.py     |  8 ++--
> >> > >> >>  16 files changed, 85 insertions(+), 104 deletions(-)
> >> > >> >>
> >> > >> >> diff --git a/MAINTAINERS b/MAINTAINERS
> >> > >> >> index 7aefda93d017f07d616f0f6d191129914fbeb484..668ccec9ae6df47192b1af668e3fdbeb1dfa15ea 100644
> >> > >> >> --- a/MAINTAINERS
> >> > >> >> +++ b/MAINTAINERS
> >> > >> >> @@ -65,7 +65,6 @@ R:    Sam Protsenko <semen.protsenko at linaro.org>
> >> > >> >>  S:     Maintained
> >> > >> >>  T:     git https://source.denx.de/u-boot/custodians/u-boot-dfu.git
> >> > >> >>  F:     boot/android_ab.c
> >> > >> >> -F:     cmd/ab_select.c
> >> > >> >>  F:     doc/android/ab.rst
> >> > >> >>  F:     include/android_ab.h
> >> > >> >>  F:     test/py/tests/test_android/test_ab.py
> >> > >> >> diff --git a/cmd/Kconfig b/cmd/Kconfig
> >> > >> >> index dd33266cec70a2b134b7244acae1b7f098b921e8..11e8d363dc9b137723a86a240412d82dd0dbccc5 100644
> >> > >> >> --- a/cmd/Kconfig
> >> > >> >> +++ b/cmd/Kconfig
> >> > >> >> @@ -1067,6 +1067,7 @@ config CMD_ADC
> >> > >> >>  config CMD_BCB
> >> > >> >>         bool "bcb"
> >> > >> >>         depends on PARTITIONS
> >> > >> >> +       depends on ANDROID_AB
> >> > >> >
> >> > >> > When building with khadas-vim3_android_defconfig, we can see that CMD_BCB is no
> >> > >> > longer part of that build:
> >> > >> >
> >> > >> > $ grep CMD_BCB .config
> >> > >> > <empty>
> >> > >> >
> >> > >> > However, if we look at include/configs/meson64_android.h, we can see
> >> > >> > that the "bcb" command is not only used for checking the _slot suffix.
> >> > >> >
> >> > >> > It's also used for checking the bootloader reason. For example, in
> >> > >> > BOOTENV_DEV_FASTBOOT, we call:
> >> > >> >
> >> > >> >    "if bcb test command = bootonce-bootloader; then " \
> >> > >> >
> >> > >> > Since CMD_BCB is no longer part of the .config (due to this dependency),
> >> > >> > the boot script now shows errors:
> >> > >> >
> >> > >> > """
> >> > >> > U-Boot 2024.10-00796-g969325278805 (Oct 11 2024 - 14:46:00 +0200) khadas-vim3
> >> > >> >
> >> > >> > Model: Khadas VIM3
> >> > >> > SoC:   Amlogic Meson G12B (A311D) Revision 29:b (10:2)
> >> > >> > DRAM:  2 GiB (effective 3.8 GiB)
> >> > >> > Core:  411 devices, 36 uclasses, devicetree: separate
> >> > >> > MMC:   mmc at ffe03000: 0, mmc at ffe05000: 1, mmc at ffe07000: 2
> >> > >> > Loading Environment from MMC... fs uses incompatible features: 00020000, ignoring
> >> > >> > Reading from MMC(2)... *** Warning - bad CRC, using default environment
> >> > >> >
> >> > >> > In:    usbkbd,serial
> >> > >> > Out:   vidconsole,serial
> >> > >> > Err:   vidconsole,serial
> >> > >> > Net:   eth0: ethernet at ff3f0000
> >> > >> >
> >> > >> > Hit any key to stop autoboot:  0
> >> > >> > Verify GPT: success!
> >> > >> > Unknown command 'bcb' - try 'help'
> >> > >> > Warning: BCB is corrupted or does not exist
> >> > >> > dev: pinctrl at 14
> >> > >> > dev: pinctrl at 40
> >> > >> > gpio: pin 88 (gpio 88) value is 1
> >> > >> > Unknown command 'bcb' - try 'help'
> >> > >> > Warning: BCB is corrupted or does not exist
> >> > >> > Loading Android boot partition...
> >> > >> > switch to partitions #0, OK
> >> > >> > mmc2(part 0) is current device
> >> > >> > """
> >> > >> >
> >> > >> > I know we should not be using a boot script, nor non A/B configs but
> >> > >> > it's a bummer that this series breaks an upstream
> >> > >> > defconfig (khadas-vim3_android_defconfig)
> >> > >> >
> >> > >> > My recommendation:
> >> > >> >
> >> > >> > Make BCB_CMD_AB_SELECT implementation dependant on ANDROID_AB.
> >> > >> > This way, users can use CMD_BCB with and without ANDROID_AB being enabled.
> >> > >> >
> >> > >> > We could do:
> >> > >> > When ANDROID_AB=y, implement bcb ab_select subcommand
> >> > >> > When ANDROID_AB=n, command is not accessible.
> >> > >> >
> >> > >> > I'll send you a diff shortly for this.
> >> > >>
> >> > >> Here is an illustration on how that would work:
> >> > >>
> >> > >> diff --git a/cmd/Kconfig b/cmd/Kconfig
> >> > >> index 861c31e26408..e1a4a97b042d 100644
> >> > >> --- a/cmd/Kconfig
> >> > >> +++ b/cmd/Kconfig
> >> > >> @@ -1055,7 +1055,6 @@ config CMD_ADC
> >> > >>  config CMD_BCB
> >> > >>    bool "bcb"
> >> > >>    depends on PARTITIONS
> >> > >> -  depends on ANDROID_AB
> >> > >>    help
> >> > >>      Read/modify/write the fields of Bootloader Control Block, usually
> >> > >>      stored on the flash "misc" partition with its structure defined in:
> >> > >> diff --git a/cmd/bcb.c b/cmd/bcb.c
> >> > >> index 4fd32186ae65..4fe634f14cc5 100644
> >> > >> --- a/cmd/bcb.c
> >> > >> +++ b/cmd/bcb.c
> >> > >> @@ -438,6 +438,9 @@ static int do_bcb_ab_select(struct cmd_tbl *cmdtp, int flag, int argc,
> >> > >>    char slot[2];
> >> > >>    bool dec_tries = true;
> >> > >>
> >> > >> +  if (!CONFIG_IS_ENABLED(AB_SELECT))
> >> > >> +          return CMD_RET_SUCCESS;
> >> > >> +
> >> > >>    for (int i = 4; i < argc; i++) {
> >> > >>            if (!strcmp(argv[i], "--no-dec"))
> >> > >>                    dec_tries = false;
> >> > >> @@ -474,6 +477,9 @@ static int do_bcb_ab_dump(struct cmd_tbl *cmdtp, int flag, int argc,
> >> > >>    struct blk_desc *dev_desc;
> >> > >>    struct disk_partition part_info;
> >> > >>
> >> > >> +  if (!CONFIG_IS_ENABLED(AB_SELECT))
> >> > >> +          return CMD_RET_SUCCESS;
> >> > >> +
> >> > >>    if (part_get_info_by_dev_and_name_or_num(argv[1], argv[2],
> >> > >>                                             &dev_desc, &part_info,
> >> > >>                                             false) < 0) {
> >> > >>
> >> > >
> >> > > We also need to include an #ifdef directive for the ab_select_slot()
> >> > > function usage; otherwise, the code will not compile successfully.
> >> >
> >> > Are you sure? Per my understanding, it's possible that the compiler
> >> > optimizes this out because CONFIG_IS_ENABLED(AB_SELECT)
> >> > is known as build time.
> >> >
> >> > When I tried this diff with khadas-vim3_android_defconfig I did not see
> >> > any build errors. I will try again early next week.
> >> >
> >>
> >> As I recall, the IS_ENABLED() mechanism serves as a runtime checker to
> >> determine whether specific CONFIG_* options are enabled. Consequently,
> >> all code paths under this mechanism are always compiled. I attempted to
> >> disable CONFIG_ANDROID_AB for the sandbox_defconfig, but it resulted in
> >> the expected linker error.
> >>
> >> /tmp/ccAvYrKL.ltrans25.ltrans.o: In function `do_bcb_ab_select':
> >> <artificial>:(.text+0x6d5d): undefined reference to `ab_select_slot'
> >> collect2: error: ld returned 1 exit status
> >> Makefile:1813: recipe for target 'u-boot' failed
> >> make: *** [u-boot] Error 1
> >>
> >> I have already prepared a new version using #ifdef directives. I will
> >> send it shortly.
> >
> > Something else is going on here, since we do this all the time and
> > rely on it. So long as the code is behind an if() the dead code should
> > be eliminated.
> >
> 
> I have passed my diff (using CONFIG_IS_ENABLED) through the U-Boot CI:
> https://source.denx.de/u-boot/custodians/u-boot-dfu/-/pipelines/22700
> 
> See the branch:
> https://source.denx.de/u-boot/custodians/u-boot-dfu/-/commits/dmitry/ab-dump-v3
> 
> There are some test errors (sandbox test) but the "world build" stage
> finished sucessfully.
> 
> I have also tested locally using the CI container:
> $ cd ~/work/upstream/u-boot
> $ git clean -xdf
> $ make mproper
> $ docker run -v $PWD:$PWD -it trini/u-boot-gitlab-ci-runner:jammy-20240227-14Mar2024 /bin/bash
> 
> # In container
> uboot at 0ba059e8b7af/$ cd /home/mkorpershoek/work/upstream/u-boot
> uboot at 0ba059e8b7af:/home/mkorpershoek/work/upstream/u-boot$ pip install -r test/py/requirements.txt
> uboot at 0ba059e8b7af:/home/mkorpershoek/work/upstream/u-boot$ ./test/py/test.py --bd sandbox --build -k test_ut
> 
> No build errors either.
> 
> Dmitry, can you clarify what compiler/build commands you've used to see
> that error?
> 
> For reference, here is what buildman has in the CI container:
> 
> uboot at 0ba059e8b7af:/home/mkorpershoek/work/upstream/u-boot$ ./tools/buildman/buildman --list-tool-chains
> List of available toolchains (17):
> aarch64   : /opt/gcc-13.2.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc
> arc       : /opt/gcc-13.2.0-nolibc/arc-linux/bin/arc-linux-gcc
> arm       : /opt/gcc-13.2.0-nolibc/arm-linux-gnueabi/bin/arm-linux-gnueabi-gcc
> c89       : /usr/bin/c89-gcc
> c99       : /usr/bin/c99-gcc
> i386      : /opt/gcc-13.2.0-nolibc/i386-linux/bin/i386-linux-gcc
> m68k      : /opt/gcc-13.2.0-nolibc/m68k-linux/bin/m68k-linux-gcc
> microblaze: /opt/gcc-13.2.0-nolibc/microblaze-linux/bin/microblaze-linux-gcc
> mips      : /opt/gcc-13.2.0-nolibc/mips-linux/bin/mips-linux-gcc
> nios2     : /opt/gcc-13.2.0-nolibc/nios2-linux/bin/nios2-linux-gcc
> powerpc   : /opt/gcc-13.2.0-nolibc/powerpc-linux/bin/powerpc-linux-gcc
> riscv32   : /opt/gcc-13.2.0-nolibc/riscv32-linux/bin/riscv32-linux-gcc
> riscv64   : /opt/gcc-13.2.0-nolibc/riscv64-linux/bin/riscv64-linux-gcc
> sandbox   : /usr/bin/cgcc
> sh2       : /opt/gcc-13.2.0-nolibc/sh2-linux/bin/sh2-linux-gcc
> x86_64    : /usr/bin/x86_64-linux-gnu-gcc
> xtensa    : /opt/2020.07/xtensa-dc233c-elf/bin/xtensa-dc233c-elf-gcc
> 
> I think we should use CONFIG_IS_ENABLED if possible

I just run build on the my x86 Ubuntu machine.

$ cd uboot
$ make mproper
$ make sandbox_defconfig
$ make -j$(nproc)

That's all.

I've already sent the v4 patch with #ifdef. I can prepare the v5 patch
using the IS_ENABLED() macro and will aim to send it today.

But I have one question:

Do we really want to display the ab_select and ab_dump subcommands to
users if these commands are just stubs? Perhaps we should consider
adding #ifdef directives to the subcommand arrays.

-- 
Thank you,
Dmitry


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