TODO

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= PA-RISC Linux TODO =
 
= PA-RISC Linux TODO =
  
== Status & TODO 2022-05-13 ==
+
== Status & TODO 2022-08-06 ==
 +
* SeaBIOS and palo: muldi3 and divdi3 (from libgcc.a) trashes fr22-fr25 because of xmpyu instruction. Doesn't seem to have negative effect, but those registers should better be saved/restored in pdc_entry() and iodc_entry(), or libgcc should be fixed to not use floating point instructions.
 +
* Port grub2 to hppa ?
 +
* STARTED: PALO: Fix "list directory content" if /boot partition is partition #1 (Directory listing of /. -> ext2_init: bad magic 0x0 ->Failed to mount partition 2)
 +
* STARTED: [https://patchwork.kernel.org/project/linux-parisc/patch/20211031204952.25678-2-svens@stackframe.org/ Visualize FX framebuffer/DRM support (by Sven Schnelle)]
 +
* Implement ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT : https://lwn.net/ml/linux-kernel/20190724055850.6232-14-alex@ghiti.fr/
 
* STARTED: improve unaligned handlers, e.g. to use get_user/put_user inline asm
 
* STARTED: improve unaligned handlers, e.g. to use get_user/put_user inline asm
 
* [[VDSO]] - Review gettimeofday and clock_gettime() implementation, possibly use a light-weight-syscall and rely on cr16 and cpu speed for more accurate timing?  
 
* [[VDSO]] - Review gettimeofday and clock_gettime() implementation, possibly use a light-weight-syscall and rely on cr16 and cpu speed for more accurate timing?  
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* NO_IRQ -> should be converted to (0) instead of (-1) -> Helge (check assembly, check in drivers/parisc/*)
 
* NO_IRQ -> should be converted to (0) instead of (-1) -> Helge (check assembly, check in drivers/parisc/*)
 
* check assembly in drivers/parisc/*
 
* check assembly in drivers/parisc/*
 +
* INEQUIVALENT ALIASES occur building gnuradio on debian.
 
* STARTED by Sven: Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
 
* STARTED by Sven: Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
* STARTED: [https://patchwork.kernel.org/project/linux-parisc/patch/20211031204952.25678-2-svens@stackframe.org/ Visualize FX framebuffer/DRM support (by Sven Schnelle)]
 
 
* Add Linux kernel PIM driver - /sys/firmware/pim/*
 
* Add Linux kernel PIM driver - /sys/firmware/pim/*
 
* parisc timers: convert to generic clockevent (Arnd Bergmann) - https://patchwork.kernel.org/project/linux-parisc/patch/20201008154651.1901126-14-arnd@arndb.de/
 
* parisc timers: convert to generic clockevent (Arnd Bergmann) - https://patchwork.kernel.org/project/linux-parisc/patch/20201008154651.1901126-14-arnd@arndb.de/
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* '''QEMU Full-system emulation'''
 
* '''QEMU Full-system emulation'''
 
** Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> offers to do contract work for QEMU through his company.
 
** Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> offers to do contract work for QEMU through his company.
** Emulate PCI serial card (0/0/4/0 tty PCI Serial (103c1048))
 
 
** Fix migration of VMs (noticed by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>):  Boot a qcow2 image in QEMU using the GTK, Wait a random time anywhere between 5-20s, Pause the VM, Switch to the "monitor" tab, Run "savevm foo" to save the current VM state as "foo", Type "quit" to exit QEMU, Add "-loadvm foo" to your QEMU command line and launch QEMU, Unpause the VM  
 
** Fix migration of VMs (noticed by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>):  Boot a qcow2 image in QEMU using the GTK, Wait a random time anywhere between 5-20s, Pause the VM, Switch to the "monitor" tab, Run "savevm foo" to save the current VM state as "foo", Type "quit" to exit QEMU, Add "-loadvm foo" to your QEMU command line and launch QEMU, Unpause the VM  
** Fix mouse emulation with help of Xorg 11.6.6 sources
 
 
** Check "HPPA support for IGNITE-UX install discs" for HP Logic Analyzer 16700A (Mail from Keith Monahan <keith@techtravels.org> Sept 2020)
 
** Check "HPPA support for IGNITE-UX install discs" for HP Logic Analyzer 16700A (Mail from Keith Monahan <keith@techtravels.org> Sept 2020)
 
** STARTED: Finish LASI and 82596 NIC for QEMU -> https://github.com/hdeller/qemu-hppa/commits/lasi
 
** STARTED: Finish LASI and 82596 NIC for QEMU -> https://github.com/hdeller/qemu-hppa/commits/lasi
 
*** ncr53c710 driver from amiga: https://github.com/tonioni/WinUAE/blob/master/qemuvga/lsi53c710.cpp
 
*** ncr53c710 driver from amiga: https://github.com/tonioni/WinUAE/blob/master/qemuvga/lsi53c710.cpp
 
* '''QEMU User-mode emulation'''
 
* '''QEMU User-mode emulation'''
 +
** FAILURE to run 64bit host and 32bit guest, readdir() failure.
 +
*** https://gitlab.com/qemu-project/qemu/-/issues/263
 +
*** https://bugs.launchpad.net/qemu/+bug/1805913/+attachment/5217520/+files/readdir-bug.c  (test program)
 +
*** https://bugzilla.kernel.org/show_bug.cgi?id=205957
 +
*** https://bugs.launchpad.net/qemu/+bug/1805913
 +
*** https://lore.kernel.org/linux-fsdevel/20201012220620.124408-1-linus.walleij@linaro.org/
 
** Track [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970460 qemu-user: trashes argv0 breaking multi-call binaries] QEMU bug.
 
** Track [https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=970460 qemu-user: trashes argv0 breaking multi-call binaries] QEMU bug.
 
** Because of this bug, qemu-user still has build-problems with those packages: lilypond, fceux, perl, sane-backends
 
** Because of this bug, qemu-user still has build-problems with those packages: lilypond, fceux, perl, sane-backends
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** It looks like haskell packages still fail on qemu (e.g., haskell-swish).
 
** It looks like haskell packages still fail on qemu (e.g., haskell-swish).
 
** STARTED: qemu bug building gcc-arm-none-eabi: https://buildd.debian.org/status/fetch.php?pkg=gcc-arm-none-eabi&arch=hppa&ver=15%3A10.3-2021.07-1&stamp=1633455020&raw=0
 
** STARTED: qemu bug building gcc-arm-none-eabi: https://buildd.debian.org/status/fetch.php?pkg=gcc-arm-none-eabi&arch=hppa&ver=15%3A10.3-2021.07-1&stamp=1633455020&raw=0
* INEQUIVALENT ALIASES occur building gnuradio on debian.
 
 
* '''JAVA'''
 
* '''JAVA'''
 
** Finish OpenJDK, see patch and mail from Adrian Glaubitz 05.02.2021.
 
** Finish OpenJDK, see patch and mail from Adrian Glaubitz 05.02.2021.
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** Revert "parisc: Increase parisc_cache_flush_threshold setting"
 
** Revert "parisc: Increase parisc_cache_flush_threshold setting"
 
** parisc: Fix typos in comments
 
** parisc: Fix typos in comments
 +
** parisc: Disable debug code regarding cache flushes in handle_nadtlb_fault()
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2de8b4cc2051ee1d40eedbcf94de0e7d04507c37 '''parisc: Rewrite cache flush code for PA8800/PA8900''']
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=798082be69fea995a475ca1db8f9873589e207d9 '''parisc: Fix patch code locking and flushing''']
 +
* Kernel 5.19
 +
** parisc: video: fbdev: stifb: Add sti_dump_font() to dump STI font
 +
** parisc: Prevent ldil() to sign-extend into upper 32 bits
 +
** parisc: Fix wrong comment for shr macro
 +
** parisc: Add dep_safe() macro to deposit a register in 32- and 64-kernels
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c1770918492414e8dc103d996f3f3860ee0bfd6c '''parisc: Optimize tmpalias function calls''']
 +
** parisc: Drop __ARCH_WANT_OLD_READDIR and __ARCH_WANT_SYS_OLDUMOUNT
 +
** parisc: Don't enforce DMA completion order in cache flushes
 +
** parisc: Don't hardcode assembler bit definitions in tmpalias code
 +
** parisc/stifb: Implement fb_is_primary_device() (backported to v5.10+)
 +
** parisc/stifb: Keep track of hardware path of graphics card  (backported to v5.10+)
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6ba688364856ad083be537f08e86ba97f433d405 '''parisc: fix a crash with multicore scheduler'''] (backported to v5.18)
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1d0811b03eb30b2f0793acaa96c6ce90b8b9c87a parisc/stifb: Fix fb_is_primary_device() only available with CONFIG_FB_STI] (backported to v5.10+)
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0a1355db36718178becd2bfe728a023933d73123 '''parisc: Enable ARCH_HAS_STRICT_MODULE_RWX'''] (backported to v5.2+)
 +
** parisc: align '*' in comment in math-emu code
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e9ed22e6e5010997a2f922eef61ca797d0a2a246 '''parisc: Fix flush_anon_page on PA8800/PA8900'''] (backported to v5.18)
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96b80fcd2705fc50ebe1f7f3ce204e861b3099ab '''parisc/unaligned: Fix emulate_ldw() breakage'''] (backported to v5.18)
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=aa78fa905b4431c432071a878da99c2b37fc0e79 '''parisc: Fix vDSO signal breakage on 32-bit kernel'''] (backported to v5.18)
 +
* Kernel 5.20 / 6.0
 +
** parisc: Clean up names in hardware database
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cab56b51ec0e69128909cef4650e1907248d821b '''parisc: Fix device names in /proc/iomem'''] (backported to v4.9+)
 +
** parisc: Drop pa_swapper_pg_lock spinlock
 +
** [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6431e92fc827bdd2d28f79150d90415ba9ce0d21 '''parisc: io_pgetevents_time64() needs compat syscall in 32-bit compat mode'''] (backported to v5.1+)
 +
** parisc: Fix comment typo in fault.c
 +
** parisc: Drop zero variable initialisations in mm/init.c
 +
** parisc: Check the return value of ioremap() in lba_driver_probe()
 +
** Input: gscps2 - check return value of ioremap() in gscps2_probe()
 +
** parisc: Do not initialise statics to 0
  
 
== Debian kernel and userspace programs ==
 
== Debian kernel and userspace programs ==
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** DONE: Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c)
 
** DONE: Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c)
 
** DONE: Fix mouse in with HP-UX 10 and 11 - reported by Stefano Repici
 
** DONE: Fix mouse in with HP-UX 10 and 11 - reported by Stefano Repici
** DONE: Add bigger font to STI ROM / SeaBIOS  
+
** DONE: Add bigger fonts to STI ROM / SeaBIOS  
 
** DONE: Implement TOC in qemu (via qemu monitor -> NMI)
 
** DONE: Implement TOC in qemu (via qemu monitor -> NMI)
 +
** DONE: Fix X11 cursor emulation in HP-UX with help of Xorg 11.6.6 sources, fixed in qemu v7.1
 +
** DONE: Fix serial port assignment and pass-through, fixed in qemu v7.1
  
 
== ABI breakages (e.g. dropped HP-UX support) ==
 
== ABI breakages (e.g. dropped HP-UX support) ==

Revision as of 06:49, 7 August 2022

Contents

PA-RISC Linux TODO

Status & TODO 2022-08-06

  • Kernel: still missing Linux kernel development (no patches available yet or maybe not possible to implement):
    • maybe: optimize flush_dcache_page() implementation like sparc. See Documentation/cachetlb.txt, e.g. used in aio subsystem
    • maybe implement transparent huge pages (due to cache coherency technically only possible on PA8500-PA8700 CPUs, not possible on PA8800-PA8900 CPUs)
    • 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.
    • 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).
  • Debian packages / Userspace work
    • teach "blkid" about palo partition
    • glibc: add backtrace() function, problems when building elfutils package: http://buildd.debian-ports.org/status/package.php?p=elfutils&suite=sid
    • Circular dependency problems with kde packages caused by vlc and ffmpeg (Dave)
      • Solution: Rebuild ffmpeg outside the buildd (as some dependencies have probably been deleted) and upload a +b1 version. Then trigger bin-nmu of phonon package. Finally this resolves then the dependencies of vlc, ffmpeg, phonon, chromaprint, polkit-kde-agent-1, kwrited, kwallet-kf5 and libkf5notifications-dev...
    • Due to very bad performance running multiple copies of dot program (Dave)
      • In vtk6 debian package, adding DOT_NUM_THREADS = 1 helps.
  • palo (PA-RISC Boot Loader):
    • PALO - add regular rewind & load to avoid tftp boot timing issues. See mail from Frank Schreiner "PALO issues" (Dec 2018).
    • When listing directory contents, resolve and print symlink target file names too, e.g. "vmlinux -> linux-5.12.1-64bit".
    • Fix palo deb package to build iplboot natively (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851792)
    • 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
    • DONE: Analyze futex hang (CPU soft lockup) situation with test-lock testcase in the libprelude debian package - fixed by parisc: Add atomic64_set_release() define to avoid CPU soft lockups
    • DONE: Add TOC handler, sending TOC via IPMI interface "toc s"
    • DONE: autofs/automounter is broken, patch sent to list, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=892953
    • DONE: Try enabling DEBUG_VM_PGTABLE in kernel
    • DONE: SLAB breaks, SLUB works (works in kernel v5.17)
    • DONE: implement .con_font_set (consw) in sticon.c to be able to change fonts at runtime (since v5.10)
    • DONE: Implement kernel VDSO support - Randolphs patch
  • QEMU:
    • DONE: Add kernel fw_cfg support (drivers/firmware/qemu_fw_cfg.c)
    • DONE: Fix mouse in with HP-UX 10 and 11 - reported by Stefano Repici
    • DONE: Add bigger fonts to STI ROM / SeaBIOS
    • DONE: Implement TOC in qemu (via qemu monitor -> NMI)
    • DONE: Fix X11 cursor emulation in HP-UX with help of Xorg 11.6.6 sources, fixed in qemu v7.1
    • DONE: Fix serial port assignment and pass-through, fixed in qemu v7.1

ABI breakages (e.g. dropped 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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