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 2018-12-26 ==
+
== Status & TODO 2019-03-14 ==
 +
* Update latest QEMU successes.
 +
* STARTED: Fix sbuild not returning used disc size: /usr/share/perl5/Sbuild/Build.pm line 2786, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=923484
 +
* STARTED: Fix fallouts from strace, http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b7dc5a071ddf69c0350396b203cba32fe5bab510
 +
* STARTED: IRQ Balancing seems broken with latest kernels, http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f73493eb4aecdd6edd8a749890e6e2dcfa0a7978
 
* PALO - add regular rewind & load to avoid tftp boot timing issues. See mail from Frank Schreiner "PALO issues" (Dec 2018).
 
* PALO - add regular rewind & load to avoid tftp boot timing issues. See mail from Frank Schreiner "PALO issues" (Dec 2018).
 
** Modify palo to be able to load lifimage file
 
** Modify palo to be able to load lifimage file
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* STARTED: convert old-style rtc driver drivers/input/misc/hp_sdc_rtc.c to new RTC model, remove the procfs and miscdevice interfaces first and replace the ioctl with a struct rtc_class_ops. Arnd Bergmann can review those patches, but Alexandre and Alessandro are the ones who would merge them once the driver is moved to drivers/rtc. (Mail from Arnd Bergmann, 28.04.2016) - see https://patchwork.kernel.org/patch/10701397/
 
* STARTED: convert old-style rtc driver drivers/input/misc/hp_sdc_rtc.c to new RTC model, remove the procfs and miscdevice interfaces first and replace the ioctl with a struct rtc_class_ops. Arnd Bergmann can review those patches, but Alexandre and Alessandro are the ones who would merge them once the driver is moved to drivers/rtc. (Mail from Arnd Bergmann, 28.04.2016) - see https://patchwork.kernel.org/patch/10701397/
 
* check usage of CONFIG_MLONGCALLS, only 14MB/s with debian kernel and dd if=/dev/zero of=here bs=1k count=100000  ?
 
* check usage of CONFIG_MLONGCALLS, only 14MB/s with debian kernel and dd if=/dev/zero of=here bs=1k count=100000  ?
−
* IRQ Balancing seems broken with latest kernels.
 
 
* Add some cond_resched() calls to avoid RCU stalls, see commit 2a8bc5316adc998951e8f726c31e231a6021eae2
 
* Add some cond_resched() calls to avoid RCU stalls, see commit 2a8bc5316adc998951e8f726c31e231a6021eae2
 
* MAYBE: Implement DCACHE_WORD_ACCESS in kernel (Complaint from Linus)
 
* MAYBE: Implement DCACHE_WORD_ACCESS in kernel (Complaint from Linus)
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** disable FP-register save/restore at kernel entry? - https://patchwork.kernel.org/patch/3975291/
 
** 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)
 
** 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.
+
** 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!)
 
** 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.
 
** 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.
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** parisc: Revert "Release spinlocks using ordered store"
 
** parisc: Revert "Release spinlocks using ordered store"
 
** [http://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/commit/?h=parisc-4.20-4&id=1e8249b8a4e960018e4baca6b523b8a4500af600 parisc: Enable -ffunction-sections for modules on 32-bit kernel] (backported to v4.18+)
 
** [http://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/commit/?h=parisc-4.20-4&id=1e8249b8a4e960018e4baca6b523b8a4500af600 parisc: Enable -ffunction-sections for modules on 32-bit kernel] (backported to v4.18+)
−
* Kernel 4.21
+
* Kernel 5.0
 
** parisc: move __IGNORE* entries to non uapi header
 
** parisc: move __IGNORE* entries to non uapi header
 
** parisc: add __NR_syscalls along with __NR_Linux_syscalls
 
** parisc: add __NR_syscalls along with __NR_Linux_syscalls
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** parisc: Fix serio address output
 
** parisc: Fix serio address output
 
** parisc: Fix HP SDC hpa address output
 
** parisc: Fix HP SDC hpa address output
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dfbaecb2b707cfdc5276b548d52b437384bd6483 '''parisc: Remap hugepage-aligned pages in set_kernel_text_rw()'''] (backported to 4.20)
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b7dc5a071ddf69c0350396b203cba32fe5bab510 '''parisc: Fix ptrace syscall number modification'''] (backported to 4.5+)
 +
** CREDITS/MAINTAINERS: Retire parisc-linux.org email domain
 +
* Kernel 5.1
 +
** parisc: don't include <asm/cacheflush.h> in <asm/dma-mapping.h>
 +
** parisc: move internal implementation details out of <asm/dma-mapping.h>
 +
** parisc: turn GET_IOC into an inline function
 +
** parisc: properly type the iommu field in struct pci_hba_data
 +
** parisc: properly type the return value of parisc_walk_tree
 +
** parisc/dino: use container_of in DINO_DEV
 +
** parisc/lba_pci: use container_of in LBA_DEV
 +
** parisc: remove the HBA_DATA macro
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=81fe5bba88a3fbe34ee6c5d18e327c6aaacd588c '''parisc: Hide built-in serial aux port of Tosca GSP card''']
 +
** parisc: Show rescheduling interrupts on SMP machines only
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b102f29b2d8603f15071384e88125b8eab5f8faa '''parisc: Count IPI function call interrupts''']
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f73493eb4aecdd6edd8a749890e6e2dcfa0a7978 '''parisc: Improve initial IRQ to CPU assignment''']
 +
** parisc: Use F_EXTEND() macro in iosapic code
 +
** parisc: Add constants for PDC_RELOCATE PDC call
 +
** [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8207d4ee44d3f525bf9aa57807ac9db5d0d90c1a '''parisc: Show machine product number during boot''']
 +
** parisc: Add constant for PDC_PAT_COMPLEX firmware call
 +
** parisc: Add constants for various PDC firmware calls
 +
** parisc: remove meaningless ccflags-y in arch/parisc/boot/Makefile
 +
** parisc: use memblock_alloc() instead of custom get_memblock()
 +
** parisc: replace oops_in_progress manipulation with bust_spinlocks()
 +
** parisc: Add PDC_CRASH_PREP PDC function number
  
 
== Debian kernel and userspace programs ==
 
== Debian kernel and userspace programs ==
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** DONE: in interactive mode, add reboot option command
 
** DONE: in interactive mode, add reboot option command
 
** DONE: [https://git.kernel.org/cgit/linux/kernel/git/deller/palo.git/commit/?id=70bd7a9a41e318c0575755a78c4d18ad97495c47 '''Unbreak loading Linux kernels bigger than 16 MB'''] (fixed in palo 1.96, Oct. 2016)
 
** DONE: [https://git.kernel.org/cgit/linux/kernel/git/deller/palo.git/commit/?id=70bd7a9a41e318c0575755a78c4d18ad97495c47 '''Unbreak loading Linux kernels bigger than 16 MB'''] (fixed in palo 1.96, Oct. 2016)
 +
** DONE: Du to alternative coding in 4.20, ship debian kernel as SMP variant only (Kernel 4.20)
  
 
Debian kernel / Generic Kernel bugs fixed
 
Debian kernel / Generic Kernel bugs fixed
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** DONE: use CONFIG_COMPAT_BINFMT_ELF and get rid of arch/parisc/kernel/binfmt_elf32.c
 
** 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: 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
+
** 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  
+
** 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)
  
 
* Debian installer:
 
* Debian installer:
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*** (maybe) gcc-4.9 which links against libgc...? (affects objc related code only)
 
*** (maybe) gcc-4.9 which links against libgc...? (affects objc related code only)
 
*** dietlibc (patch sent upstream) - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=769105  TODO: make patch for dietlibc to use LONG_LONG_PAIR for ftruncate64() and then rebuild util-vserver package
 
*** dietlibc (patch sent upstream) - https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=769105  TODO: make patch for dietlibc to use LONG_LONG_PAIR for ftruncate64() and then rebuild util-vserver package
−
* [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=93cb8e20d56be40c541475f77b5f565fbb385a4b Dropped ENOTSUP (252) constant from kernel with v4.19]. Gave problems and parisc is only platform, see libuv bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900237
+
* [http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=93cb8e20d56be40c541475f77b5f565fbb385a4b Dropped ENOTSUP (252) constant from kernel with v4.19]. Gave problems and parisc is only platform which defined it because of HP-UX, see libuv bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=900237. Nevertheless rebuild of libattr, libseliux and fakeroot necessary.
  
 
== Considerations between Debian unstable and Debian Jessie release ==
 
== Considerations between Debian unstable and Debian Jessie release ==

Revision as of 08:08, 14 March 2019

Contents

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

Status & TODO 2019-03-14

  • 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.
  • 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)

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!

  • ns87415 dma doesn't work reliably on suckyio-systems
Retrieved from "https://parisc.wiki.kernel.org/index.php?title=TODO&oldid=8805"
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