1. 12 Jan, 2006 4 commits
  2. 11 Jan, 2006 3 commits
  3. 09 Jan, 2006 5 commits
  4. 23 Nov, 2005 1 commit
  5. 16 Nov, 2005 1 commit
    • Benjamin Herrenschmidt's avatar
      [PATCH] powerpc: pci_64 fixes & cleanups · b5166cc2
      Benjamin Herrenschmidt authored
      
      
      I discovered that in some cases (PowerMac for example) we wouldn't
      properly map the PCI IO space on recent kernels. In addition, the code
      for initializing PCI host bridges was scattered all over the place with
      some duplication between platforms.
      
      This patch fixes the problem and does a small cleanup by creating a
      pcibios_alloc_controller() in pci_64.c that is similar to the one in
      pci_32.c (just takes an additional device node argument) that takes care
      of all the grunt allocation and initialisation work. It should work for
      both boot time and dynamically allocated PHBs.
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      b5166cc2
  6. 14 Nov, 2005 2 commits
  7. 10 Nov, 2005 4 commits
  8. 09 Nov, 2005 4 commits
    • Nick Piggin's avatar
      [PATCH] sched: resched and cpu_idle rework · 64c7c8f8
      Nick Piggin authored
      
      
      Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce
      confusion, and make their semantics rigid.  Improves efficiency of
      resched_task and some cpu_idle routines.
      
      * In resched_task:
      - TIF_NEED_RESCHED is only cleared with the task's runqueue lock held,
        and as we hold it during resched_task, then there is no need for an
        atomic test and set there. The only other time this should be set is
        when the task's quantum expires, in the timer interrupt - this is
        protected against because the rq lock is irq-safe.
      
      - If TIF_NEED_RESCHED is set, then we don't need to do anything. It
        won't get unset until the task get's schedule()d off.
      
      - If we are running on the same CPU as the task we resched, then set
        TIF_NEED_RESCHED and no further action is required.
      
      - If we are running on another CPU, and TIF_POLLING_NRFLAG is *not* set
        after TIF_NEED_RESCHED has been set, then we need to send an IPI.
      
      Using these rules, we are able to remove the test and set operation in
      resched_task, and make clear the previously vague semantics of
      POLLING_NRFLAG.
      
      * In idle routines:
      - Enter cpu_idle with preempt disabled. When the need_resched() condition
        becomes true, explicitly call schedule(). This makes things a bit clearer
        (IMO), but haven't updated all architectures yet.
      
      - Many do a test and clear of TIF_NEED_RESCHED for some reason. According
        to the resched_task rules, this isn't needed (and actually breaks the
        assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock
        held). So remove that. Generally one less locked memory op when switching
        to the idle thread.
      
      - Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner
        most polling idle loops. The above resched_task semantics allow it to be
        set until before the last time need_resched() is checked before going into
        a halt requiring interrupt wakeup.
      
        Many idle routines simply never enter such a halt, and so POLLING_NRFLAG
        can be always left set, completely eliminating resched IPIs when rescheduling
        the idle task.
      
        POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs.
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Con Kolivas <kernel@kolivas.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      64c7c8f8
    • Nick Piggin's avatar
      [PATCH] sched: disable preempt in idle tasks · 5bfb5d69
      Nick Piggin authored
      
      
      Run idle threads with preempt disabled.
      
      Also corrected a bugs in arm26's cpu_idle (make it actually call schedule()).
      How did it ever work before?
      
      Might fix the CPU hotplugging hang which Nigel Cunningham noted.
      
      We think the bug hits if the idle thread is preempted after checking
      need_resched() and before going to sleep, then the CPU offlined.
      
      After calling stop_machine_run, the CPU eventually returns from preemption and
      into the idle thread and goes to sleep.  The CPU will continue executing
      previous idle and have no chance to call play_dead.
      
      By disabling preemption until we are ready to explicitly schedule, this bug is
      fixed and the idle threads generally become more robust.
      
      From: alexs <ashepard@u.washington.edu>
      
        PPC build fix
      
      From: Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
      
        MIPS build fix
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      Signed-off-by: default avatarYoichi Yuasa <yuasa@hh.iij4u.or.jp>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      5bfb5d69
    • Stephen Rothwell's avatar
      ppc64: remove ppc_irq_dispatch_handler · d4be4f37
      Stephen Rothwell authored
      
      
      Use __do_IRQ instead.  The only difference is that every controller
      is now assumed to have an end() routine (only xics_8259 did not).
      Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      d4be4f37
    • Stephen Rothwell's avatar
      5a7b3ff4
  9. 07 Nov, 2005 2 commits
    • David Gibson's avatar
      [PATCH] powerpc: Kill ppcdebug · dcad47fc
      David Gibson authored
      
      
      The ancient ppcdebug/PPCDBG mechanism is now only used in two places.
      First, in the hash setup code, one of the bits allows the size of the
      hash table to be reduced by a factor of 8 - which would be better
      accomplished with a command line option for that purpose.  The other
      was a bunch of bus walking related messages in the iSeries code, which
      would seem to be insufficient reason to keep the mechanism.
      
      This patch removes the last traces of this mechanism.
      
      Built and booted on iSeries and pSeries POWER5 LPAR (ARCH=powerpc).
      Signed-off-by: default avatarDavid Gibson <dwg@au1.ibm.com>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
      dcad47fc
    • Benjamin Herrenschmidt's avatar
      [PATCH] ppc64: support 64k pages · 3c726f8d
      Benjamin Herrenschmidt authored
      
      
      Adds a new CONFIG_PPC_64K_PAGES which, when enabled, changes the kernel
      base page size to 64K.  The resulting kernel still boots on any
      hardware.  On current machines with 4K pages support only, the kernel
      will maintain 16 "subpages" for each 64K page transparently.
      
      Note that while real 64K capable HW has been tested, the current patch
      will not enable it yet as such hardware is not released yet, and I'm
      still verifying with the firmware architects the proper to get the
      information from the newer hypervisors.
      Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      3c726f8d
  10. 02 Nov, 2005 14 commits