TODO

From Linux PARISC Wiki
(Difference between revisions)
Jump to: navigation, search
m
m (PA-RISC Linux TODO (actually this is Helge's TODO list))
Line 1: Line 1:
= PA-RISC Linux TODO (actually this is Helge's TODO list) =
+
= PA-RISC Linux TODO =
  
== Status & TODO 2022-03-17 ==
+
== Status & TODO 2022-03-18 ==
 
* DONE: Try enabling DEBUG_VM_PGTABLE in kernel
 
* DONE: Try enabling DEBUG_VM_PGTABLE in kernel
 
* DONE: SLAB breaks, SLUB works (works in kernel v5.17)
 
* 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 .con_font_set (consw) in sticon.c to be able to change fonts at runtime (since v5.10)
 
* 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
 
* STARTED: Implement kernel [[VDSO]] support - https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=vdso
 
* STARTED: Implement kernel [[VDSO]] support - https://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux.git/log/?h=vdso
 
* [https://lore.kernel.org/linux-parisc/4544A34A.6080700@tausq.org/ Randolphs patch]
 
* [https://lore.kernel.org/linux-parisc/4544A34A.6080700@tausq.org/ Randolphs patch]
** Get rid of executable stack, maybe use gateway page instead for signal returns?
+
** Get rid of executable stack
** Review gettimeofday and clock_gettime() implementation, possibly use a light-weight-syscall and rely on cr16 and cpu speed for more accurate timing? similiar to commit http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=18ad51dd342a7eb09dbcd059d0b451b616d4dafc
+
** Review gettimeofday and clock_gettime() implementation, possibly use a light-weight-syscall and rely on cr16 and cpu speed for more accurate timing?  
 
* Fix kernel: make ARCH=parisc tools/perf
 
* Fix kernel: make ARCH=parisc tools/perf
 +
* better implementation to get stack pointer (in return_address(), in stack checker in irq.c, ...)
 +
* Add BPF assembler implementation
 +
* Enable BlockTLB on PA1.x for STI framebuffer (see block tlb info in sti.pdf documentation) and ftp://parisc.parisc-linux.org/docs/pdc32.pdf
 +
* 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)]
 
* 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/*
 
* Clean up drivers/parisc/iosapic.c  and drivers/parisc/sba_iommu.c (Mail from Carlos Bilbao)
 
* Clean up drivers/parisc/iosapic.c  and drivers/parisc/sba_iommu.c (Mail from Carlos Bilbao)
 
* 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/
* Add BPF assembler implementation
+
* 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/
* Enable SPARSEMEM_VMEMMAP_ENABLE
+
 
* ONGOING: Enable UBSAN and fix fallouts
 
* ONGOING: Enable UBSAN and fix fallouts
 +
* unaligned warning (from glibc) when running apt-get: https://sourceware.org/bugzilla/show_bug.cgi?id=20243
 +
* Add some cond_resched() calls to avoid RCU stalls, see commit 2a8bc5316adc998951e8f726c31e231a6021eae2
 +
* Enable SPARSEMEM_VMEMMAP_ENABLE
 
* STARTED: implement CONFIG_VMAP_STACK "virtually mapped stacks and thread_info cleanup" -> https://lwn.net/Articles/693026/
 
* STARTED: implement CONFIG_VMAP_STACK "virtually mapped stacks and thread_info cleanup" -> https://lwn.net/Articles/693026/
 
* Check if https://lkml.org/lkml/2020/7/23/1246 was added to avoid TLB stalls (commits https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c6fe44d96fc1536af5b11cd859686453d1b7bfd1 and https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2a9127fcf2296674d58024f83981f40b128fffea) - kernel v5.9 seems good.
 
* Check if https://lkml.org/lkml/2020/7/23/1246 was added to avoid TLB stalls (commits https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c6fe44d96fc1536af5b11cd859686453d1b7bfd1 and https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2a9127fcf2296674d58024f83981f40b128fffea) - kernel v5.9 seems good.
* STARTED by Sven: Fix kexec on PA8800/PA8900 CPUs: how to restart the CPUs on these systems?
+
* '''QEMU Full-system emulation'''
* QEMU issues:
+
** Fix mouse emulation with help of Xorg 11.6.6 sources
** check why ldd doesn't work with qemu chroot
+
** Check "HPPA support for IGNITE-UX install discs" for HP Logic Analyzer 16700A (Mail from Keith Monahan <keith@techtravels.org> Sept 2020)
** check why qgis fails to build with "Illegal instruction" error (https://buildd.debian.org/status/fetch.php?pkg=qgis&arch=hppa&ver=3.22.4%2Bdfsg-3&stamp=1645691873&raw=0)
+
** STARTED: Finish LASI and 82596 NIC for QEMU -> https://github.com/hdeller/qemu-hppa/commits/lasi
** Fix mouse completely with X11 sources
+
** qemu: Check "HPPA support for IGNITE-UX install discs" for HP Logic Analyzer 16700A (Mail from Keith Monahan <keith@techtravels.org> Sept 2020)
+
 
*** 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
*** Check "IGNITE-UX install discs" from Keith Monahan (09/20)
+
* '''QEMU User-mode emulation'''
** STARTED: Finish LASI and 82596 NIC for QEMU -> https://github.com/hdeller/qemu-hppa/commits/lasi
+
 
** 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
** Check qemu bug: https://gitlab.com/qemu-project/qemu/-/issues/635
+
** check why ldd doesn't work with qemu chroot
 +
** check why qgis fails to build with "Illegal instruction" error (https://buildd.debian.org/status/fetch.php?pkg=qgis&arch=hppa&ver=3.22.4%2Bdfsg-3&stamp=1645691873&raw=0)
 
** qemu and executable stack: The following error occurred on pacific in mlton build: /usr/lib/mlton/mlton-compile: error while loading shared libraries: libm.so.6: cannot enable executable stack as shared object requires: Invalid argument
 
** qemu and executable stack: The following error occurred on pacific in mlton build: /usr/lib/mlton/mlton-compile: error while loading shared libraries: libm.so.6: cannot enable executable stack as shared object requires: Invalid argument
 
** kcm-fcitx5 fails to build on qemu but builds on real hardware.
 
** kcm-fcitx5 fails to build on qemu but builds on real hardware.
Line 37: Line 41:
 
** 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
* 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.
** From Adrian Glaubitz (9/29/2021): The Rust project merged a change [1] that allows rustc to use GCC instead of LLVM as codegen backend for generating machine code through libgccjit. This means that we are in principal able now to build Rust code for all the architectures that GCC support but LLVM doesn't, which includes hppa. Please see this [2] and this [3] comment to see how to get started with cross-building the Rust compiler for a new target using libgccjit. We will have to add these new architectures to the libc crate first, see an example PR for that here [4]. Since I can't work on all these targets myself, I wanted to ask you to help me and get the support for hppa added to libc and rustc where necessary.
+
* Rust language
 +
**From Adrian Glaubitz (9/29/2021): The Rust project merged a change [1] that allows rustc to use GCC instead of LLVM as codegen backend for generating machine code through libgccjit. This means that we are in principal able now to build Rust code for all the architectures that GCC support but LLVM doesn't, which includes hppa. Please see this [2] and this [3] comment to see how to get started with cross-building the Rust compiler for a new target using libgccjit. We will have to add these new architectures to the libc crate first, see an example PR for that here [4]. Since I can't work on all these targets myself, I wanted to ask you to help me and get the support for hppa added to libc and rustc where necessary.
 
*** [1] https://github.com/rust-lang/rust/pull/87260
 
*** [1] https://github.com/rust-lang/rust/pull/87260
 
*** [2] https://github.com/rust-lang/rust/pull/87260#issuecomment-930221503
 
*** [2] https://github.com/rust-lang/rust/pull/87260#issuecomment-930221503
 
*** [3] https://github.com/rust-lang/rust/pull/87260#issuecomment-930223504
 
*** [3] https://github.com/rust-lang/rust/pull/87260#issuecomment-930223504
 
*** [4] https://github.com/rust-lang/libc/pull/2414
 
*** [4] https://github.com/rust-lang/libc/pull/2414
* upgrade libgcc via:
+
* How to upgrade libgcc:
 
** apt install -f -o Dpkg::Options::="--force-overwrite"
 
** apt install -f -o Dpkg::Options::="--force-overwrite"
 
** see: https://raphaelhertzog.com/2011/08/01/understanding-dpkgs-file-overwrite-error/
 
** see: https://raphaelhertzog.com/2011/08/01/understanding-dpkgs-file-overwrite-error/
* 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  ?
* Add some cond_resched() calls to avoid RCU stalls, see commit 2a8bc5316adc998951e8f726c31e231a6021eae2
 
* MAYBE: Implement DCACHE_WORD_ACCESS in kernel (Complaint from Linus)
 
 
* gcc optimizations:
 
* gcc optimizations:
 
** _mcount can be optimized (smaller) by not subtracting offset)
 
** _mcount can be optimized (smaller) by not subtracting offset)
 
** check if we can use -fentry from gcc for _mcount optimization
 
** check if we can use -fentry from gcc for _mcount optimization
 
** put PLABELS into read-only section (gcc function pa_reloc_rw_mask() needs modification, see "section mismatches" mails, 11.09.2017)
 
** put PLABELS into read-only section (gcc function pa_reloc_rw_mask() needs modification, see "section mismatches" mails, 11.09.2017)
* Enable BlockTLB on PA1.x for STI framebuffer (see block tlb info in sti.pdf documentation) and ftp://parisc.parisc-linux.org/docs/pdc32.pdf
 
 
* debian parisc perl bug (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721537) shows that mmap on parisc linux is horribly inefficient.  We allocate huge maps for small files. This should be improved. Mailthread: " parisc mmap: private file maps" ,http://www.spinics.net/lists/linux-parisc/msg05083.html  or  https://rt.perl.org/Public/Bug/Display.html?id=119567  https://rt.perl.org/Public/Bug/Display.html?id=119567  
 
* debian parisc perl bug (http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721537) shows that mmap on parisc linux is horribly inefficient.  We allocate huge maps for small files. This should be improved. Mailthread: " parisc mmap: private file maps" ,http://www.spinics.net/lists/linux-parisc/msg05083.html  or  https://rt.perl.org/Public/Bug/Display.html?id=119567  https://rt.perl.org/Public/Bug/Display.html?id=119567  
* unaligned warning (from glibc) when running apt-get: https://sourceware.org/bugzilla/show_bug.cgi?id=20243
 
 
* kernel work
 
* kernel work
 
** trace irq flags - http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=24131a61ec8c2d83431cb818281d3c9db986ab08
 
** trace irq flags - http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=24131a61ec8c2d83431cb818281d3c9db986ab08
Line 65: Line 65:
 
*** New one: https://patchwork.kernel.org/patch/10141217/ (alpha: fix crash if pthread_create races with signal delivery)
 
*** New one: https://patchwork.kernel.org/patch/10141217/ (alpha: fix crash if pthread_create races with signal delivery)
 
*** Kernel patches: http://marc.info/?t=140610652200001&r=1&w=2, The proposed fix is in: http://marc.info/?t=140675670100010&r=1&w=2, http://marc.info/?t=142327510200001&r=1&w=2,  
 
*** Kernel patches: http://marc.info/?t=140610652200001&r=1&w=2, The proposed fix is in: http://marc.info/?t=140675670100010&r=1&w=2, http://marc.info/?t=142327510200001&r=1&w=2,  
*** qemu-user bug: https://gitlab.com/qemu-project/qemu/-/issues/494
+
*** alpha qemu-user bug: https://gitlab.com/qemu-project/qemu/-/issues/494
 
** convert irq handling to use CONFIG_IRQ_DOMAIN_HIERARCHY (serial port problem, action handler msising when registering irq)
 
** convert irq handling to use CONFIG_IRQ_DOMAIN_HIERARCHY (serial port problem, action handler msising when registering irq)
 
** Circular dependency problems with kde packages caused by vlc and ffmpeg (Dave)
 
** Circular dependency problems with kde packages caused by vlc and ffmpeg (Dave)
Line 71: Line 71:
 
** Due to very bad performance running multiple copies of dot program (Dave)
 
** Due to very bad performance running multiple copies of dot program (Dave)
 
*** In vtk6 debian package, adding DOT_NUM_THREADS = 1 helps.
 
*** In vtk6 debian package, adding DOT_NUM_THREADS = 1 helps.
*** Another issue that I have been wondering about is the performance of our kernel spinlock code.  PA 8800 and PA 8900 processors have a cache line length of 128 bytes.  I believe thereare some places where we assume 64 bytes.  We also allocate spinlocks on 16 byte boundaries. We might get better performance if we allocated on 32 (PA 1.X) and 128 (PA 2.0).  Helge: change: __PA_LDCW_ALIGNMENT
 
*** I've also seen that better performance may be obtained by doing a byte store to spinlock prior to ldcw.  This dirties the cache line and allows operation in cache in certain situations. I think this mainly applies to PA 1.X but I'm not sure.  I have some example code somewhere. Helge:  change struct arch_spinlock_t; in spinlock_types.h
 
 
** 3.14 partly: return ((unsigned long) mapping >> 7) & ((SHMLBA >> PAGE_SHIFT) - 1); in arch/parisc/kernel/sys_parisc.c
 
** 3.14 partly: return ((unsigned long) mapping >> 7) & ((SHMLBA >> PAGE_SHIFT) - 1); in arch/parisc/kernel/sys_parisc.c
** better implementation to get stack pointer (in return_address(), in stack checker in irq.c, ...)
 
  
 
* Kernel: Hard to solve outstanding issues
 
* Kernel: Hard to solve outstanding issues
Line 85: Line 82:
 
** 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/*
** 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.
 
  
 
* Kernel: Low priority patches needs further work  
 
* Kernel: Low priority patches needs further work  

Revision as of 06:59, 18 March 2022

Contents

PA-RISC Linux TODO

Status & TODO 2022-03-18

  • 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/*
  • 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).
    • 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!).
    • gcc -> join 32- and 64bit compiler, make "-m64" work, get rid of hppa64-linux-gnu-gcc
  • userspace
  • 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
  • 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 font to STI ROM / SeaBIOS
    • DONE: Implement TOC in qemu (via qemu monitor -> NMI)

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!

Personal tools