TODO

From Linux PARISC Wiki
(Difference between revisions)
Jump to: navigation, search
m (Debian kernel and userspace programs)
m (Kernel patches)
Line 112: Line 112:
 
** Native types in uapi/asm/stat.h
 
** Native types in uapi/asm/stat.h
 
** '''Dropped HP-UX Support: changed EWOULDBLOCK = EAGAIN -> https://patchwork.kernel.org/patch/3499551/''' (important ABI change!)
 
** '''Dropped HP-UX Support: changed EWOULDBLOCK = EAGAIN -> https://patchwork.kernel.org/patch/3499551/''' (important ABI change!)
 +
** parisc: Make EWOULDBLOCK be equal to EAGAIN on parisc
 
** sticon font problem fixed, sticon now automatically chooses the Linux fb fonts if available instead of using the HP fonts
 
** sticon font problem fixed, sticon now automatically chooses the Linux fb fonts if available instead of using the HP fonts
 +
** parisc: add flexible mmap memory layout support
 +
** parisc: convert uapi/asm/stat.h to use native types only
 +
** parisc: wire up sched_setattr and sched_getattr
 +
** parisc: fix cache-flushing
 
* Kernel 3.15
 
* Kernel 3.15
 
** epoll_pwait bug: debian packages libio-epoll-perl and python-falcon failed -> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ab3e55b119c9653b19ea4edffb86f04db867ac98
 
** epoll_pwait bug: debian packages libio-epoll-perl and python-falcon failed -> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ab3e55b119c9653b19ea4edffb86f04db867ac98

Revision as of 16:59, 15 May 2015

Contents

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

Status & TODO 2015-05-13

  • add wiki page about kernel cross-compiling
  • Kernel: Hard to solve outstanding issues
    • megaraid on my rp5470 hangs at boot (maybe because SCSI chassis not connected)? -> use new megaraid driver for debian
    • Fix FireGL X1/X3 in C8000 - currently broken (no DRM and software accel is incredibly slow plus colors in 24bpp mode are wrong seems ok in debian 8 sid / 3.16.7 kernel) - Info: manual "Radeon R5xx Acceleration" - http://www.x.org/docs/AMD/R5xx_Acceleration_v1.1.pdf and generic: http://www.botchco.com/agd5f/?p=50
  • Kernel: still missing Linux kernel development (no patches available yet):
    • Fix FTRACE: https://patchwork.kernel.org/patch/3554391/
    • optimize flush_dcache_page() implementation like sparc. See Documentation/cachetlb.txt, e.g. used in aio subsystem
    • Implement CONFIG_DEBUG_STACK_USAGE ?
    • fix wrong _init notation in kernel
    • NO_IRQ -> should be converted to (0) instead of (-1) -> Helge (check assembly, check in drivers/parisc/*)
    • implement alternative coding for UP/SMP. See arch/x86/include/asm/alternative.h
    • 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
    • on C8000, report 1 socket with 2 cores.
    • implement HUGE pages (or even better transparent huge pages)
    • 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
  • Kernel: Low priority patches needs further work
    • Fix exception table entries to be of type int (32bit), even on 64bit kernel -> saves space. - https://patchwork.kernel.org/patch/3033801/ - partly done.
    • 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.
    • task_struct/thread_info split -- task_struct should not be visible in entry.S, we need to move some items into thread_info -- this includes pt_regs and maybe some of the flags (ptrace, etc)
    • Visualize FX support (will probably never happen!)
  • Debian packages / Userspace work
    • IMPORTANT: fix OpenJDK - fixes required in zeroport (stack grows up!).
    • 64-bit userspace, 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
  • palo (PA-RISC Boot Loader):
    • Modify (if possible), that palo can read (sequential) tftpbootable-vmlinuxes as well as the current boot-vmlinux images (simplifies build/handling)
    • move decompression of Kernel to Linux kernel code instead of palo

Kernel patches

Debian kernel and userspace programs

  • Debian 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)
  • Debian installer:

ABI breakages (HP-UX support)

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

Updates for next newsletter

  • fixed 64bit SMP kernel & sticon on machines with more than 4GB RAM
  • Dave found O_SYNC bug in glibc (Typo in hppa __O_SYNC define in <bits/fcntl.h>)
  • lots of syscall fixes regarding compat kernel
  • Migration parisc-linux.org
  • debian-ports.org access
  • 3.13 with all patches in (coherency)
  • buildds running
  • wiki migration finished (05 Feb 2014)
  • old parisc-linux kernel mailinglist imported into gmane.org - http://dir.gmane.org/gmane.linux.ports.parisc - 23 Nov 2014
  • parisc-linux domain is now owned by Helge (August 2014)
  • Debian 8.0 installer images available.

Testsuites, kernel and userspace testing tools

  • GLIBC issues: https://sourceware.org/glibc/wiki/PortStatus
  • We also have a problem with poll in rpcbind on 32-bit kernels. Runs forever. Not analyzed yet.
  • glib2.0 atomic bug: Dave: I see the problem building various packages -- apt is is one. It occurs when multiple dot processes are started by graph when package documentation is being generated. The number of dot processes spawned depends on the number of processors on the build system. However, the faults occur even on a UP system. I debugged one of these segvs enough to see that the problem occurred in a glib2.0 library. It's using the GCC "sync" interface.
  • From Dave: gcc thread issues including thread cancellation, glib2.0 problem, maybe __tls_get_addr clobber too?

TODO Drivers

  • IPMI support on rp-class / Support graceful shutdown from BMC on rp servers (`PC -GRACEFUL`)
  • 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
  • investigate not putting in extable entries for put_kernel_asm; will probably reduce kernel size
Personal tools