[git pull 2.6.35.stable] intel_idle patches for 2.6.35.stable

[Len Brown]

Hi Greg,

please pull from: 

git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6.35.git idle-release

to sync 2.6.35.y with upstream changes to the intel_idle driver.

After applying this series, 2.6.35.y and upstream intel_idle.c
differ by just 1 source line.

This will update the files shown below.

thanks!

Len Brown
Intel Open Source Technology Center


ps. a consolidated plain patch is available here:
http://ftp.kernel.org/pub/linux/kernel/people/lenb/idle/patches/2.6.35/idle-release-2.6.35.8.diff.gz

 arch/x86/include/asm/mwait.h     |   15 ++++
 arch/x86/kernel/acpi/cstate.c    |   11 +---
 drivers/acpi/acpi_pad.c          |    7 +--
 drivers/cpuidle/cpuidle.c        |   31 ++++++++
 drivers/cpuidle/governors/menu.c |   23 ++++--
 drivers/idle/intel_idle.c        |  149 +++++++++++++++++---------------------
 include/linux/cpuidle.h          |    5 ++
 7 files changed, 137 insertions(+), 104 deletions(-)
 create mode 100644 arch/x86/include/asm/mwait.h
 mode change 100755 => 100644 drivers/idle/intel_idle.c

through these commits:

Ai Li (1):
      cpuidle: extend cpuidle and menu governor to handle dynamic states

Arjan van de Ven (1):
      intel_idle: recognize Lincroft Atom Processor

H. Peter Anvin (1):
      x86, mwait: Move mwait constants to a common header file

Len Brown (8):
      intel_idle: delete substates DEBUG modparam
      intel_idle: delete power_policy modparam, and choose substate functions
      intel_idle: add support for Westmere-EX
      intel_idle: enable Atom C6
      intel_idle: simplify test for leave_mm()
      intel_idle: delete bogus data from cpuidle_state.power_usage
      intel_idle: add initial Sandy Bridge support
      intel_idle: do not use the LAPIC timer for ATOM C2

Namhyung Kim (1):
      intel_idle: add missing __percpu markup

Suresh Siddha (1):
      intel_idle: Voluntary leave_mm before entering deeper

Thomas Weber (1):
      intel_idle: Change mode 755 => 644

with this log:

commit 595b03600572568a3c051dd4a8a499d1a465965d
Author: Len Brown <len.brown@xxxxxxxxx>
Date:   Sat Oct 23 23:25:53 2010 -0400

    intel_idle: do not use the LAPIC timer for ATOM C2
    
    If we use the LAPIC timer during ATOM C2 on
    some nvidia chisets, the system stalls.
    
    https://bugzilla.kernel.org/show_bug.cgi?id=21032
    
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit 9e27ce26f51c6f352b6a5e15969c60ac446d9513
Author: Len Brown <len.brown@xxxxxxxxx>
Date:   Wed Jul 7 00:12:03 2010 -0400

    intel_idle: add initial Sandy Bridge support
    
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit f7026593d3cb7fb16e53eb873bccafcac38e4014
Author: Len Brown <len.brown@xxxxxxxxx>
Date:   Fri Oct 15 21:23:25 2010 -0400

    intel_idle: delete bogus data from cpuidle_state.power_usage
    
    The mW data in this field is a total fabrication
    and serves no purpose other than to mislead
    those who might see it in sysfs.  Delete it.
    
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit 3ba3f2c2fcd31c462c5aff64c31088d8b4cf8411
Author: Len Brown <len.brown@xxxxxxxxx>
Date:   Fri Oct 15 20:43:06 2010 -0400

    intel_idle: simplify test for leave_mm()
    
    A run-time test to invoke leave_mm() for the deepest
    supported C-state is redundant, since the appropriate
    C-states already have flags with CPUIDLE_FLAG_TLB_FLUSHED set.
    
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit 42c0325e906d474fa3a64b1e8ca2572cb59e2077
Author: Len Brown <len.brown@xxxxxxxxx>
Date:   Tue Oct 5 13:43:14 2010 -0400

    intel_idle: enable Atom C6
    
    ATM-C6 was commented out, pending public documentation.
    
    https://bugzilla.kernel.org/show_bug.cgi?id=19762
    
    Tested-by: Dennis Jansen <Dennis.Jansen@...>
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit 776f00b9e228fabf386d1c094556836cda0ded37
Author: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
Date:   Thu Sep 30 21:19:07 2010 -0400

    intel_idle: Voluntary leave_mm before entering deeper
    
    Avoid TLB flush IPIs for the cores in deeper c-states by voluntary leave_mm()
    before entering into that state. CPUs tend to flush TLB in those c-states
    anyways.
    
    acpi_idle does this with C3-type states, but it was not caried over
    when intel_idle was introduced.  intel_idle can apply it
    to C-states in addition to those that ACPI might export as C3...
    
    Signed-off-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit d177882cf728db3312b597be3b1bedda55866991
Author: Ai Li <aili@xxxxxxxxxxxxxx>
Date:   Mon Aug 9 17:20:13 2010 -0700

    cpuidle: extend cpuidle and menu governor to handle dynamic states
    
    On some SoC chips, HW resources may be in use during any particular idle
    period.  As a consequence, the cpuidle states that the SoC is safe to
    enter can change from idle period to idle period.  In addition, the
    latency and threshold of each cpuidle state can vary, depending on the
    operating condition when the CPU becomes idle, e.g.  the current cpu
    frequency, the current state of the HW blocks, etc.
    
    cpuidle core and the menu governor, in the current form, are geared
    towards cpuidle states that are static, i.e.  the availabiltiy of the
    states, their latencies, their thresholds are non-changing during run
    time.  cpuidle does not provide any hook that cpuidle drivers can use to
    adjust those values on the fly for the current idle period before the menu
    governor selects the target cpuidle state.
    
    This patch extends cpuidle core and the menu governor to handle states
    that are dynamic.  There are three additions in the patch and the patch
    maintains backwards-compatibility with existing cpuidle drivers.
    
    1) add prepare() to struct cpuidle_device.  A cpuidle driver can hook
       into the callback and cpuidle will call prepare() before calling the
       governor's select function.  The callback gives the cpuidle driver a
       chance to update the dynamic information of the cpuidle states for the
       current idle period, e.g.  state availability, latencies, thresholds,
       power values, etc.
    
    2) add CPUIDLE_FLAG_IGNORE as one of the state flags.  In the prepare()
       function, a cpuidle driver can set/clear the flag to indicate to the
       menu governor whether a cpuidle state should be ignored, i.e.  not
       available, during the current idle period.
    
    3) add power_specified bit to struct cpuidle_device.  The menu governor
       currently assumes that the cpuidle states are arranged in the order of
       increasing latency, threshold, and power savings.  This is true or can
       be made true for static states.  Once the state parameters are dynamic,
       the latencies, thresholds, and power savings for the cpuidle states can
       increase or decrease by different amounts from idle period to idle
       period.  So the assumption of increasing latency, threshold, and power
       savings from Cn to C(n+1) can no longer be guaranteed.
    
    It can be straightforward to calculate the power consumption of each
    available state and to specify it in power_usage for the idle period.
    Using the power_usage fields, the menu governor then selects the state
    that has the lowest power consumption and that still satisfies all other
    critieria.  The power_specified bit defaults to 0.  For existing cpuidle
    drivers, cpuidle detects that power_specified is 0 and fills in a dummy
    set of power_usage values.
    
    Signed-off-by: Ai Li <aili@xxxxxxxxxxxxxx>
    Cc: Len Brown <len.brown@xxxxxxxxx>
    Acked-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
    Cc: Ingo Molnar <mingo@xxxxxxx>
    Cc: Venkatesh Pallipadi <venki@xxxxxxxxxx>
    Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

commit d8860b18557ca34591e42439f8dc74ec472878e3
Author: Namhyung Kim <namhyung@xxxxxxxxx>
Date:   Sun Aug 8 03:10:03 2010 +0900

    intel_idle: add missing __percpu markup
    
    intel_idle_cpuidle_devices is a percpu pointer
    but was missing __percpu markup.
    
    Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxx>
    Acked-by: Tejun Heo <tj@xxxxxxxxxx>
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit 551899f89314a75618fc0a0d15d7802e32c3a59a
Author: Thomas Weber <weber@xxxxxxxxxxxxx>
Date:   Mon Jul 12 08:56:43 2010 +0200

    intel_idle: Change mode 755 => 644
    
    Remove execution permission from source file.
    
    Signed-off-by: Thomas Weber <weber@xxxxxxxxxxxxx>
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit 183f602acfd251d1af79644703d2c7b5b3fc9da8
Author: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Date:   Fri Sep 17 15:36:40 2010 -0700

    x86, mwait: Move mwait constants to a common header file
    
    We have MWAIT constants spread across three different .c files, for no
    good reason.  Move them all into a common header file.
    
    Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
    Reviewed-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
    Cc: Len Brown <lenb@xxxxxxxxxx>
    LKML-Reference: <tip-*@git.kernel.org>

commit f7098be53c7077db5e084750dc49ee5927e10cee
Author: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Date:   Wed Jul 21 23:42:25 2010 -0400

    intel_idle: recognize Lincroft Atom Processor
    
    Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit 6c2da7c2334b358d9f69e90c0471dceb59d84d9c
Author: Len Brown <len.brown@xxxxxxxxx>
Date:   Mon Jul 26 23:40:19 2010 -0400

    intel_idle: add support for Westmere-EX
    
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit fcf27b6a9020633d4bda83a21d2fc0d824b4551d
Author: Len Brown <len.brown@xxxxxxxxx>
Date:   Fri Jul 23 16:04:46 2010 -0400

    intel_idle: delete power_policy modparam, and choose substate functions
    
    The idea behind power policy was that it would start off as a modparam,
    and then hook into the new "global" in-kernel power vs energy tunable.
    But that tunable isn't happening, so delete the hook here.
    
    With the policy hook gone, the sub-state choice functions
    do not do anything useful, so delete them from the critical path.
    
    To handle sub-states in the future, we will advertise them
    with dedicated cpuidle_state entries.  That is necessary
    because some of the sub-states will have substantially different
    properties than their peer sub-states.
    
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>

commit c5b67bcf97c60cc9a98ed09193c9fdd469252ae7
Author: Len Brown <len.brown@xxxxxxxxx>
Date:   Fri May 28 02:22:03 2010 -0400

    intel_idle: delete substates DEBUG modparam
    
    it isn't useful anymore
    
    Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
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