1. 17 Jun, 2006 1 commit
  2. 28 Apr, 2006 1 commit
  3. 26 Mar, 2006 1 commit
  4. 21 Mar, 2006 1 commit
  5. 03 Mar, 2006 1 commit
  6. 23 Feb, 2006 2 commits
    • Paul Mackerras's avatar
      powerpc: Implement accurate task and CPU time accounting · c6622f63
      Paul Mackerras authored
      This implements accurate task and cpu time accounting for 64-bit
      powerpc kernels.  Instead of accounting a whole jiffy of time to a
      task on a timer interrupt because that task happened to be running at
      the time, we now account time in units of timebase ticks according to
      the actual time spent by the task in user mode and kernel mode.  We
      also count the time spent processing hardware and software interrupts
      accurately.  This is conditional on CONFIG_VIRT_CPU_ACCOUNTING.  If
      that is not set, we do tick-based approximate accounting as before.
      To get this accurate information, we read either the PURR (processor
      utilization of resources register) on POWER5 machines, or the timebase
      on other machines on
      * each entry to the kernel from usermode
      * each exit to usermode
      * transitions between process context, hard irq context and soft irq
        context in kernel mode
      * context switches.
      On POWER5 systems with shared-processor logical partitioning we also
      read both the PURR and the timebase at each timer interrupt and
      context switch in order to determine how much time has been taken by
      the hypervisor to run other partitions ("steal" time).  Unfortunately,
      since we need values of the PURR on both threads at the same time to
      accurately calculate the steal time, and since we can only calculate
      steal time on a per-core basis, the apportioning of the steal time
      between idle time (time which we ceded to the hypervisor in the idle
      loop) and actual stolen time is somewhat approximate at the moment.
      This is all based quite heavily on what s390 does, and it uses the
      generic interfaces that were added by the s390 developers,
      i.e. account_system_time(), account_user_time(), etc.
      This patch doesn't add any new interfaces between the kernel and
      userspace, and doesn't change the units in which time is reported to
      userspace by things such as /proc/stat, /proc/<pid>/stat, getrusage(),
      times(), etc.  Internally the various task and cpu times are stored in
      timebase units, but they are converted to USER_HZ units (1/100th of a
      second) when reported to userspace.  Some precision is therefore lost
      but there should not be any accumulating error, since the internal
      accumulation is at full precision.
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    • Kumar Gala's avatar
      [PATCH] powerpc: Enable coherency for all pages on 83xx to fix PCI data corruption · 1775dbbc
      Kumar Gala authored
      On the 83xx platform to ensure the PCI inbound memory is handled properly we
      have to turn on coherency for all pages in the MMU.  Otherwise we see
      corruption if inbound "prefetching/streaming" is enabled on the PCI controller.
      Signed-off-by: default avatarRandy Vinson <rvinson@mvista.com>
      Signed-off-by: default avatarKumar Gala <galak@kernel.crashing.org>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
  7. 13 Jan, 2006 2 commits
    • Andy Whitcroft's avatar
      [PATCH] powerpc: oprofile cpu type names clash with other code · 7a45fb19
      Andy Whitcroft authored
      In 2.6.15-git6 a change was commited in the oprofile support in
      the powerpc architecture.  It introduced the powerpc_oprofile_type
      which contains the define G4.  This causes a name clash with the
      existing wacom usb tablet driver.
            CC [M]  drivers/usb/input/wacom.o
          drivers/usb/input/wacom.c:98: error: conflicting types for `G4'
          include/asm/cputable.h:37: error: previous declaration of `G4'
            CC [M]  drivers/usb/mon/mon_text.o
          make[3]: *** [drivers/usb/input/wacom.o] Error 1
          make[2]: *** [drivers/usb/input] Error 2
      The elements of an enum declared in global scope are effectivly
      global identifiers themselves.  As such we need to ensure the names
      are unique.  This patch updates the later oprofile support to use
      unique names.
      Signed-off-by: default avatarAndy Whitcroft <apw@shadowen.org>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    • Paul Mackerras's avatar
      powerpc: Provide a suitable AT_PLATFORM value · 80f15dc7
      Paul Mackerras authored
      The glibc folks want to use AT_PLATFORM to select between possible
      alternative versions of shared libraries.  This commit makes the kernel
      supply an AT_PLATFORM string that indicates what class of processor
      we are running on.  Processors with the same set of user-level
      instructions and roughly the same instruction scheduling characteristics
      are given the same AT_PLATFORM value; for example, 821, 823 and 860
      are all reported as "ppc823", and 7447, 7447A, 7448, 7450, 7451, 7455
      are all called "ppc7450".
      The intention is that the AT_PLATFORM values match the values that
      gcc accepts for the -mcpu= option.  For values which are numeric
      (e.g. -mcpu=750), "ppc" has been prepended.
      This also adds a PPC_FEATURE_BOOKE bit to the AT_HWCAP value and sets
      it for the 440 family and the Freescale 85xx family.
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
  8. 08 Jan, 2006 4 commits
  9. 17 Nov, 2005 1 commit
  10. 09 Nov, 2005 2 commits
    • Paul Mackerras's avatar
      powerpc: Add user CPU features for POWER4, POWER5, POWER5+ and Cell. · a7ddc5e8
      Paul Mackerras authored
      This is at the request of the glibc folks, who want to use these bits
      to select libraries optimized for the microarchitecture and new
      instructions in these processors.
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    • David Gibson's avatar
      [PATCH] powerpc: Consolidate asm compatibility macros · 3ddfbcf1
      David Gibson authored
      This patch consolidates macros used to generate assembly for
      compatibility across different CPUs or configs.  A new header,
      asm-powerpc/asm-compat.h contains the main compatibility macros.  It
      uses some preprocessor magic to make the macros suitable both for use
      in .S files, and in inline asm in .c files.  Headers (bitops.h,
      uaccess.h, atomic.h, bug.h) which had their own such compatibility
      macros are changed to use asm-compat.h.
      ppc_asm.h is now for use in .S files *only*, and a #error enforces
      that.  As such, we're a lot more careless about namespace pollution
      here than in asm-compat.h.
      While we're at it, this patch adds a call to the PPC405_ERR77 macro in
      futex.h which should have had it already, but didn't.
      Built and booted on pSeries, Maple and iSeries (ARCH=powerpc).  Built
      for 32-bit powermac (ARCH=powerpc) and Walnut (ARCH=ppc).
      Signed-off-by: default avatarDavid Gibson <dwg@au1.ibm.com>
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
  11. 06 Nov, 2005 1 commit
    • 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>
  12. 12 Oct, 2005 1 commit
  13. 05 Oct, 2005 1 commit
    • Paul Mackerras's avatar
      powerpc: Merge in the ppc64 version of the prom code. · 9b6b563c
      Paul Mackerras authored
      This brings in the ppc64 version of prom_init.c, prom.c and btext.c
      and makes them work for ppc32.  This also brings in the new calling
      convention, where the first entry to the kernel (with r5 != 0) goes
      to the prom_init code, which then restarts from the beginning (with
      r5 == 0) after it has done its stuff.
      For now this also brings in the ppc32 version of setup.c.  It also
      merges lmb.h.
      Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
  14. 27 Sep, 2005 2 commits