TODO

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= PA-RISC Linux TODO (actually this is Helge's TODO list) =
 
= PA-RISC Linux TODO (actually this is Helge's TODO list) =
  
== Status & TODO 2019-09-16 ==
+
== Status & TODO 2019-12-13 ==
 +
* Analyze futex hang situation with test-lock testcase in the libprelude debian package
 
* Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
 
* Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
 
* automounter/autofs is broken, most likely compiler problem: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892953
 
* automounter/autofs is broken, most likely compiler problem: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892953
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** implement BUG() and WARN() with inline assembly so that interrupt happens in delay branch of "or,<> %r0,cond,%r0". Probably not possible, because gcc will report "control reaches end of non-void function" warnings/errors.
 
** implement BUG() and WARN() with inline assembly so that interrupt happens in delay branch of "or,<> %r0,cond,%r0". Probably not possible, because gcc will report "control reaches end of non-void function" warnings/errors.
  
 +
* 64-bit userspace support (from Dave Anglin, Nick Hudson):
 +
** 64-bit userspace, [[Binutils]] 64-bit binutils needs to be fixed to get multiple stub section support.
 +
** glibc port (hppa64 can use the generic thread code)
 +
** 64-bit support in gcc is probably pretty good as 64-bit HP-UX works fine.
 +
** gdb could be a problem due to a lack of a maintainer.
 
* Debian packages / Userspace work
 
* Debian packages / Userspace work
 
** IMPORTANT: fix OpenJDK - fixes required in zeroport (stack grows up!).
 
** IMPORTANT: fix OpenJDK - fixes required in zeroport (stack grows up!).
 
** Fix qemu  -> Richard Henderson started userspace-qemu in 11/2016: git://github.com/rth7680/qemu.git tgt-hppa  
 
** Fix qemu  -> Richard Henderson started userspace-qemu in 11/2016: git://github.com/rth7680/qemu.git tgt-hppa  
** 64-bit userspace, [[Binutils]] 64-bit binutils needs to be fixed to get multiple stub section support.
 
 
** gcc -> join 32- and 64bit compiler, make "-m64" work, get rid of hppa64-linux-gnu-gcc
 
** gcc -> join 32- and 64bit compiler, make "-m64" work, get rid of hppa64-linux-gnu-gcc
 
* userspace
 
* userspace
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** parisc: Directly call machine_power_off() in power button driver
 
** parisc: Directly call machine_power_off() in power button driver
 
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d5654e156bc4d68a87bbaa6d7e020baceddf6e68 '''parisc: Fix HPMC handler by increasing size to multiple of 16 bytes''']
 
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d5654e156bc4d68a87bbaa6d7e020baceddf6e68 '''parisc: Fix HPMC handler by increasing size to multiple of 16 bytes''']
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b845f66f78bf42a4ce98e5cfe0e94fab41dd0742 '''parisc/pci: Switch LBA PCI bus from Hard Fail to Soft Fail mode''']
+
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b845f66f78bf42a4ce98e5cfe0e94fab41dd0742 '''parisc/pci: Switch LBA PCI bus from Hard Fail to Soft Fail mode'''] (backported to all kernels: 3.18.111 4.4.134 4.9.104 4.14.45 4.16.13 4.17)
 
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a77ab0e7ce232a62adac3d85b9ae66d0f48385ac '''parisc: Add code generator for Qemu/SeaBIOS machine info''']
 
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a77ab0e7ce232a62adac3d85b9ae66d0f48385ac '''parisc: Add code generator for Qemu/SeaBIOS machine info''']
 
** parisc: Fix out of array access in match_pci_device()
 
** parisc: Fix out of array access in match_pci_device()
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** parisc: fix race condition in patching code
 
** parisc: fix race condition in patching code
 
* Kernel 5.4
 
* Kernel 5.4
** '''parisc: Add assembly implementations for memset, strlen, strcpy, strncpy and strcat'''
+
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=83af58f8068ea3f7b3c537c37a30887bfa585069 '''parisc: Add assembly implementations for memset, strlen, strcpy, strncpy and strcat''']
 
** parisc: Add ALTERNATIVE_CODE() and ALT_COND_RUN_ON_QEMU
 
** parisc: Add ALTERNATIVE_CODE() and ALT_COND_RUN_ON_QEMU
 
** parisc: speed up flush_tlb_all_local with qemu
 
** parisc: speed up flush_tlb_all_local with qemu
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** parisc: Drop comments which are already in pci.h
 
** parisc: Drop comments which are already in pci.h
 
** parisc: Save some bytes in dino driver
 
** parisc: Save some bytes in dino driver
** '''parisc: Disable HP HSC-PCI Cards to prevent kernel crash''' (backported to all)
+
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5fa1659105fac63e0f3c199b476025c2e04111ce '''parisc: Disable HP HSC-PCI Cards to prevent kernel crash'''] (backported to all)
 
** parisc: Have git ignore generated real2.S and firmware.c
 
** parisc: Have git ignore generated real2.S and firmware.c
 
** kprobes/parisc: remove arch_kprobe_on_func_entry()
 
** kprobes/parisc: remove arch_kprobe_on_func_entry()
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** parisc: Update feature list
 
** parisc: Update feature list
 
** parisc: trigger die notifier chain in parisc_terminate()
 
** parisc: trigger die notifier chain in parisc_terminate()
** '''kexec: add KEXEC_ELF'''
+
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=175fca3bf91a1111b7e46f6655666640556b9059 '''kexec: add KEXEC_ELF''']
 
** kexec_elf: change order of elf_*_to_cpu() functions
 
** kexec_elf: change order of elf_*_to_cpu() functions
 
** kexec_elf: remove parsing of section headers
 
** kexec_elf: remove parsing of section headers
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** kexec_elf: support 32 bit ELF files
 
** kexec_elf: support 32 bit ELF files
 
** parisc: add __pdc_cpu_rendezvous()
 
** parisc: add __pdc_cpu_rendezvous()
** '''parisc: add kexec syscall support'''
+
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fc697dc0c26a5908d467454e49440862d7fe96d0 '''parisc: add kexec syscall support''']
 
** parisc: wire up kexec_file_load syscall
 
** parisc: wire up kexec_file_load syscall
 
** parisc: add support for kexec_file_load() syscall
 
** parisc: add support for kexec_file_load() syscall
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c32c47aa364096124c9c69c1a44918433832562b parisc: Remove 32-bit DMA enforcement from sba_iommu]
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=513f7f747e1cba81f28a436911fba0b485878ebd '''parisc: Fix vmap memory leak in ioremap()/iounmap()'''] (backported to v3.16+)
 +
** parisc: prefer __section from compiler_attributes.h
 +
** parisc: sysctl.c: Use CONFIG_PARISC instead of __hppa_ define
 +
** MAINTAINERS: Add hp_sdc drivers to parisc arch
 +
* Kernel 5.5
 +
** parisc: Do not hardcode registers in checksum functions
 +
** kexec: Fix pointer-to-int-cast warnings
 +
** parisc: Avoid spurious inequivalent alias kernel error messages
 +
** parisc: use pgtable-nopXd instead of 4level-fixup
 +
** parisc: soft_offline_page() now takes the pfn
 +
** parisc: Fix compiler warnings in debug_core.c
 +
** parisc: fix compilation when KEXEC=n and KEXEC_FILE=y
 +
** parisc: add missing __init annotation
  
 
== Debian kernel and userspace programs ==
 
== Debian kernel and userspace programs ==

Revision as of 19:13, 21 December 2019

Contents

PA-RISC Linux TODO (actually this is Helge's TODO list)

Status & TODO 2019-12-13

  • Kernel: still missing Linux kernel development (no patches available yet):
    • maybe implement transparent huge pages (due to cache coherency technically only possible on PA8500-PA8700 CPUs, not possible on PA8800-PA8900 CPUs)
    • optimize flush_dcache_page() implementation like sparc. See Documentation/cachetlb.txt, e.g. used in aio subsystem
    • NO_IRQ -> should be converted to (0) instead of (-1) -> Helge (check assembly, check in drivers/parisc/*)
    • check assembly in drivers/parisc/*
    • use pdc_add_valid() in kern_addr_valid(), protect against crashable acesses (like for superio-pc-drivers-detection in lp), add pdc_add_valid() to create a probe_kernel_read() implementation.
    • arch/parisc/kernel/sys_parisc.c -> use SYSCALL_ALIAS() -> maybe
  • Kernel: Low priority patches needs further work
    • disable FP-register save/restore at kernel entry? - https://patchwork.kernel.org/patch/3975291/
    • enable 16k/64k kernel page sizes (still cacheflushing-issues with SCSI driver, additional work in glibc needed to deal with >4k page size, e.g. ld-loader alignments of data/code segments)
    • Superdome support - can someone test? Should work better now with latest kernels (maybe ask Dennis Clarke <dclarke@blastwave.org>, Jan 2019).
    • Visualize FX support (will probably never happen!)
    • implement BUG() and WARN() with inline assembly so that interrupt happens in delay branch of "or,<> %r0,cond,%r0". Probably not possible, because gcc will report "control reaches end of non-void function" warnings/errors.
  • 64-bit userspace support (from Dave Anglin, Nick Hudson):
    • 64-bit userspace, Binutils 64-bit binutils needs to be fixed to get multiple stub section support.
    • glibc port (hppa64 can use the generic thread code)
    • 64-bit support in gcc is probably pretty good as 64-bit HP-UX works fine.
    • gdb could be a problem due to a lack of a maintainer.
  • Debian packages / Userspace work
    • IMPORTANT: fix OpenJDK - fixes required in zeroport (stack grows up!).
    • Fix qemu -> Richard Henderson started userspace-qemu in 11/2016: git://github.com/rth7680/qemu.git tgt-hppa
    • gcc -> join 32- and 64bit compiler, make "-m64" work, get rid of hppa64-linux-gnu-gcc
  • userspace
  • palo (PA-RISC Boot Loader):
    • Fix palo deb package to build iplboot natively (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851792)
    • Palo needs better user interaction instead of "0", "1".... Howtos.
    • Modify (if possible), that palo can read (sequential) tftpbootable-vmlinuxes as well as the current boot-vmlinux images (simplifies build/handling)

Upstream PA-RISC-related kernel patch history

Debian kernel and userspace programs

Debian kernel / Generic Kernel bugs fixed

    • DONE: Fixed 64bit SMP kernel & sticon on machines with more than 4GB RAM (Kernel 3.12)
    • DONE: Lots of syscall fixes regarding compat kernel
    • DONE: send patches to remove UP from debian kernels, use sil680 instead of siimage, see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721191 -> fixed in 3.12 / 3.13
    • DONE: Enable BMC in c8000 default kernel config - ipmi driver (CONFIG_IPMI_HANDLER=y) - http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=747482
    • DONE: remove HIL RTC from debian kernel - it creates a backtrace at boot because we have already another rtc0 active.
    • DONE: add ppdev driver, needed by CUPS, systemd reports missing module load (3.17 & 3.16 kernel)
    • DONE: Add crc-modules, event, isofs, jfs, mouse, sata, sound, squashfs, udf, uinput, scsi-common, scsi-extra, loop, serial and usb-serial debian-installer packages
    • DONE: Kernel build problem: a) disable -mfast-indirect-calls in Makefile, b) gcc compiler bug in > gcc-4.8.3-3
    • DONE: Drop HPUX-support from kernel (Kernel 4.0)
    • DONE: implemented HUGE pages
    • DONE: kernel timerfd_settime/timerfd_gettime issue, test with debian package: liblinux-fd-perl -> https://patchwork.kernel.org/patch/7951661/, backported to all kernels
    • DONE: kernel ptrace bug: http://thread.gmane.org/gmane.linux.ports.parisc/26273, possible fix: https://patchwork.kernel.org/patch/8063301/
    • DONE: Implement CONFIG_DEBUG_STACK_USAGE, in kernel 4.6
    • DONE: Use 32bit exception table entries, in kernel 4.6
    • DONE: implemented seccomp syscal, including SECCOMP_MODE_STRICT and mode 2
    • DONE: Fixed FTRACE support (http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=366dd4ea9d5f0eb78fdf4982d76506f99480ec0a)
    • DONE: Add syscall ftrace support
    • DONE: Simplify get_user()/put_user() with regard to %sr0/%sr2 usage.
    • DONE: Add tracehook support (needed for seccomp testcases, gdb, ...)
    • DONE: Added high-resolution sched_clock clocksources in 4.7, needed for debian packages: ismrmrd, haskell-http-conduit, ...
    • DONE: Detect physically broken memory via Page Deallocation Table (PDT), initial support in kernel 4.13
    • DONE: Make kernel self-decompressing (instead of palo reading gzipped kernels)
    • DONE: fix %pF and %pS usage in all kernel code
    • DONE: Enabled BMC/IPMI including Remote power on/off on C8000 and rp3410 machines (kernel 4.17 and above)
    • DONE: use CONFIG_COMPAT_BINFMT_ELF and get rid of arch/parisc/kernel/binfmt_elf32.c
    • DONE: Fix kernel writing core file, gdb reporting: BFD: Warning: /tmp/core.http.1655.ls3011.1465554447 is truncated: expected core file size >= 2187264, found: 2121728.
    • DONE: Find way to extract vmlinux out of vmlinuz (Kernel 4.19)
    • DONE: Implement alternative coding for UP & SMP, one debian kernel for UP and SMP, optimizations to avoid cache flushes on cache-less systems and other qemu-related speed-ups to avoid unnecessary syncronization (Kernel 4.20)
    • DONE: IRQ Balancing was broken, http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f73493eb4aecdd6edd8a749890e6e2dcfa0a7978
    • DONE: Added kgdb and kprobes in kernel 5.2, by Sven Schnelle
    • DONE: report on C8000 one socket with 2 cores
    • DONE: Check Kernel boot code if RAM of machine is big enough (e.g. is booting on 710 machine with 60MB possible?) - https://patchwork.kernel.org/patch/10888283/
    • DONE: convert to SPARSEMEM, instead of DISCONTIGMEM
    • DONE: (NOT POSSIBLE:) Enable huge pages on kernel text for C8000 as well - not possible, will crash due to required equivalent aliasing of caches.
    • DONE: Enable __ro_after_init
    • DONE: add dynamic ftrace support - provided by Sven in kernel 5.3
    • DONE: Fix fallouts from strace: http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b7dc5a071ddf69c0350396b203cba32fe5bab510,
    • DONE: implement kexec syscall

ABI breakages (HP-UX support)

Considerations between Debian unstable and Debian Jessie release

Jessie was not stable on SMP machines, particularly those with PA8800/PA8900 processors. It's recommended to use kernel 4.4.15 or later. The current default gcc for unstable is gcc 5.4. Most hppa fixes have been back ported to 4.9 but not all. It shouldn't hurt to use binutils from unstable. Debian glibc 2.23 is best. Most old packages should still work although there maybe inequivalent aliasing issues which are relevant on PA8800. There's also a nasty issue with gmon_start being in every shared library in Jessie. This caused a few headaches and potentially breaks applications when it's removed from a library. If you stick with the glibc in Jessie, multithreaded applications may not work as well as they could, but maybe that's not important. The kernel update is the most important one. Since hppa moved to ports, there has been a huge number of bug fixes. System stability is dramatically improved and I believe more packages are available than ever before. It's better to run unstable and just be selective about running "apt-get upgrade". (by Dave Anglin)

parisc-linux.org Homepage and Debian build server infrastructure work

Linus Torvalds barking at parisc

Testsuites, kernel and userspace testing tools

TODO Drivers

  • write Lasi floppy driver
  • write Suckyio floppy driver
  • write spifi driver (rbrad)
  • modify ncr53c8xx driver for Outfield (735 & 755)
  • write GSC FDDI driver
  • write Timi ASIC (74x) support
  • EISA DMA support

Review all the todo entries below!

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