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. This patch series has been tested on both PSERIES and POWERNV platform and is based on v3.11-rc6 kernel version. 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 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 | 14 + arch/powerpc/platforms/pseries/Kconfig | 9 - arch/powerpc/platforms/pseries/Makefile | 1 arch/powerpc/platforms/pseries/processor_idle.c | 360 ----------------------- drivers/cpuidle/Kconfig | 5 drivers/cpuidle/Kconfig.powerpc | 10 + drivers/cpuidle/Makefile | 2 drivers/cpuidle/cpuidle-ibm-power.c | 316 ++++++++++++++++++++ 9 files changed, 347 insertions(+), 372 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
