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    Subject[PATCH V7 0/7] POWER/cpuidle: Generic IBM-POWER cpuidle driver enabled for PSERIES and POWERNV platforms
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    This patch series consolidates the backend cpuidle driver for pSeries
    and powernv platforms with minimal code duplication.

    Current existing backend driver for pseries has been moved to drivers/cpuidle
    and has been extended to accommodate powernv idle power mgmt states.
    As seen in V1 of this patch series, having a separate powernv backend driver
    results in too much code duplication, which is less elegant and can pose
    maintenance problems going further.

    Using the cpuidle framework to exploit platform low power idle states
    management can take advantage of advanced heuristics, tunables and features
    provided by framework. The statistics and tracing infrastructure provided
    by the cpuidle framework also helps in enabling power management
    related tools and help tune the system and applications.

    Earlier in 3.3 kernel, pSeries idle state management was modified to
    exploit the cpuidle framework and the end goal of this patch is to have powernv
    platform also to hook its idle states into cpuidle framework with minimal
    code duplication between both platforms.

    This series aims to maintain compatibility and functionality to existing pseries
    and powernv idle cpu management code. There are no new functions or idle
    states added as part of this series. This can be extended by adding more
    states to this existing framework.

    With this patch series, the powernv cpuidle functionalities are on-par with
    pSeries idle management.

    V1 -> http://lkml.org/lkml/2013/7/23/143
    V2 -> https://lkml.org/lkml/2013/7/30/872
    V3 -> http://comments.gmane.org/gmane.linux.ports.ppc.embedded/63093
    V4 -> https://lkml.org/lkml/2013/8/22/25
    V5 -> http://lkml.org/lkml/2013/8/22/184
    V6 -> https://lkml.org/lkml/2013/8/27/432

    Changes in V7:
    ============
    * Rebased to the latest kernel 3.12-rc7

    * Default idle routine to be called on POWERNV
    is power7_idle() instead of HMT_low() routines.

    Changes in V6:
    =============
    * Made changes in Patch3: Generic POWER cpuidle driver in V5 by
    breaking down to multiple patches, as there were multiple changes
    including moving the file location.

    * Remove MAX_IDLE_STATE macro and kernel command line for
    IBM-POWER systems.

    * Make backend driver a built-in, instead of a module.
    As building this as a module is currently not possible.

    * Generic backend driver minor cleanups.

    * First two patches in V5 are not a part of the series, as
    they are generic cleanups, already pushed into the tree.

    Changes in V5:
    =============

    * As per the discussions in the community, this patch series
    enables cpuidle backend driver only for IBM-POWER
    platforms. File is re-named from drivers/cpuidle/cpuidle-powerpc.c
    to drivers/cpuidle/cpuildle-ibm-power.c
    New back-end cpuidle driver is called IBM-POWER-Idle.

    * General cleanups on the accessors front that was introduced in
    previous version.

    Changes in V4:
    =============

    * This patch series includes generic backend driver cpuidle cleanups
    including, replacing the driver and device initialisation
    routines with cpuidle_register function.

    * Enable CPUIDLE framework only for POWER and POWERNV platforms.

    Changes in V3:
    =============

    * This patch series does not include smt-snooze-delay fixes.
    This will be taken up later on.

    * Integrated POWERPC driver in drivers/cpuidle. Enabled for all of
    POWERPC platform. Currently has PSERIES and POWERNV support.
    No compile time flags in .c file. This will be one consolidated
    binary that does a run time detection based on platform and take
    decisions accordingly.

    * Enabled CPUIDLE framwork for all of PPC64.

    Changes in V2:
    =============

    * Merged the backend driver posted out for powernv in V1 with
    pSeries to create a single powerpc driver but this had compile
    time flags.

    Deepthi Dharwar (7):
    pseries/cpuidle: Move processor_idle.c to drivers/cpuidle.
    pseries/cpuidle: Use cpuidle_register() for initialisation.
    pseries/cpuidle: Make pseries_idle backend driver a non-module.
    pseries/cpuidle: Remove MAX_IDLE_STATE macro.
    POWER/cpuidle: Generic POWER CPUIDLE driver supporting PSERIES.
    POWER/cpuidle: Enable powernv cpuidle support.
    powernv/cpuidle: Enable idle powernv cpu to call into the cpuidle framework.


    arch/powerpc/include/asm/processor.h | 2
    arch/powerpc/platforms/powernv/setup.c | 13 +
    arch/powerpc/platforms/pseries/Kconfig | 9 -
    arch/powerpc/platforms/pseries/Makefile | 1
    arch/powerpc/platforms/pseries/processor_idle.c | 364 -----------------------
    drivers/cpuidle/Kconfig | 5
    drivers/cpuidle/Kconfig.powerpc | 10 +
    drivers/cpuidle/Makefile | 4
    drivers/cpuidle/cpuidle-ibm-power.c | 320 ++++++++++++++++++++
    9 files changed, 352 insertions(+), 376 deletions(-)
    delete mode 100644 arch/powerpc/platforms/pseries/processor_idle.c
    create mode 100644 drivers/cpuidle/Kconfig.powerpc
    create mode 100644 drivers/cpuidle/cpuidle-ibm-power.c


    -- Deepthi



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