Improve Qualcomm SOC msm8994/msm8992 kernel mainline support
a project by pvorel
Updated about 2 years ago. 3 hacker ♥️. 2 followers.

Project Description

Due previous hackweek (https://hackweek.opensuse.org/projects/test-mainline-kernel-on-an-older-qualcomm-soc-msm89xx-explore-mainline-kernel-qualcomm-mainlining) both msm8994 angler and msm8992 bullhead are booting and due other activity (including my work) both have working SD card, but that's just start. Add support for other functionality.

Goal for this Hackweek

  • There are still some memory issues for bullhead (SMEM, invalid patch: https://lore.kernel.org/linux-arm-msm/20230128055214.33648-1-jamiemdouglass@gmail.com/), fix them.
  • Regulators support for angler (basic for other functionality)
  • USB support for both angler and bullhead
  • Haptics support (https://wiki.postmarketos.org/wiki/Haptics)
  • Document on

Resources

  • https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git
  • https://wiki.postmarketos.org/wiki/Qualcomm_Glossary
  • https://wiki.postmarketos.org/wiki/Mainlining
  • https://wiki.postmarketos.org/wiki/Mainlining_Guide

Result

Join this project

Looking for hackers with the skills:

kernel aarch64 mainlining soc qualcomm linux

This project is part of:

Hack Week 22 Hack Week 23

Activity

  • over 2 years ago: iivanov liked this project.
  • over 2 years ago: clin liked this project.
  • over 2 years ago: pvorel started this project.
  • over 2 years ago: dmdiss liked this project.
  • over 2 years ago: pvorel added keyword "kernel" to this project.
  • over 2 years ago: pvorel added keyword "aarch64" to this project.
  • over 2 years ago: pvorel added keyword "mainlining" to this project.
  • over 2 years ago: pvorel added keyword "soc" to this project.
  • over 2 years ago: pvorel added keyword "qualcomm" to this project.
  • over 2 years ago: pvorel added keyword "linux" to this project.
  • over 2 years ago: pvorel originated this project.


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    2. Hack up a PoC (done in HW22 and HW23)
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    update HW23

    • I was able to include the crash kernel into the kernel Image.
    • I'll need to find a way to load that from init/main.c:start_kernel() probably after kcsan_init()
    • I workaround for a smoke test was to hack kexec_file_load() systemcall which has two problems:
      1. My initramfs in the porduction kernel does not have a new enough kexec version, that's not a blocker but where the week ended
      2. As the crash kernel is part of init.data it will be already stale once I can call kexec_file_load() from user-space.

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    update HW24

    • Day1
      • rebased on v6.12 with no problems others then me breaking the config
      • setting up a new compilation and qemu/virtme env
      • getting desperate as nothing works that used to work
    • Day 2
      • getting to call the invocation of loading the early kernel from __init after kcsan_init()

    • Day 3

      • fix problem of memdup not being able to alloc so much memory... use 64K page sizes for now
      • code refactoring
      • I'm now able to load the crash kernel
      • When using virtme I can boot into the crash kernel, also it doesn't boot completely (major milestone!), crash in elfcorehdr_read_notes()

    • Day 4

      • crash systems crashes (no pun intended) in copy_old_mempage() link; will need to understand elfcorehdr...
      • call path vmcore_init() -> parse_crash_elf_headers() -> elfcorehdr_read() -> read_from_oldmem() -> copy_oldmem_page() -> copy_to_iter()

    • Day 5

      • hacking arch/arm64/kernel/crash_dump.c:copy_old_mempage() to see if crash system really starts. It does.
      • fun fact: retested with more reserved memory and with UEFI FW, host kernel crashes in init but directly starts the crash kernel, so it works (somehow) \o/

    • TODOs

      • fix elfcorehdr so that we actually can make use of all this...
      • test where in the boot __init() chain we can/should call kexec_early_dump()