Changes in Kconfig

4edc13ae - cpuidle-haltpoll: select haltpoll governor

Fri, 09 Dec 2022 09:25:23 +0000

cpuidle-haltpoll: select haltpoll governorThe haltpoll cpuidle driver should select the haltpoll governor, soas to ensure that they work together.Signed-off-by: Li RongQing [ rjw: Changelog edits ]Signed-off-by: Rafael J. Wysocki List of files: /linux-6.15/drivers/cpuidle/Kconfig

6abf32f1 - cpuidle: Add RISC-V SBI CPU idle driver

Thu, 10 Feb 2022 05:49:45 +0000

cpuidle: Add RISC-V SBI CPU idle driverThe RISC-V SBI HSM extension provides HSM suspend call which canbe used by Linux RISC-V to enter platform specific low-power state.This patch adds a CPU idle driver based on RISC-V SBI calls whichwill populate idle states from device tree and use SBI calls toentry these idle states.Signed-off-by: Anup Patel Signed-off-by: Anup Patel Acked-by: Atish Patra Signed-off-by: Palmer Dabbelt List of files: /linux-6.15/drivers/cpuidle/Kconfig

9d976d67 - cpuidle: Factor-out power domain related code from PSCI domain driver

Thu, 10 Feb 2022 05:49:44 +0000

cpuidle: Factor-out power domain related code from PSCI domain driverThe generic power domain related code in PSCI domain driver is largelyindependent of PSCI and can be shared with RISC-V SBI domain driverhence we factor-out this code into dt_idle_genpd.c and dt_idle_genpd.h.Signed-off-by: Anup Patel Signed-off-by: Anup Patel Reviewed-by: Ulf Hansson Signed-off-by: Palmer Dabbelt List of files: /linux-6.15/drivers/cpuidle/Kconfig

656b4e63 - cpuidle: Fix Kconfig indentation

Thu, 21 Nov 2019 03:19:12 +0000

cpuidle: Fix Kconfig indentationAdjust indentation from spaces to tab (+optional two spaces) as incoding style with command like: $ sed -e 's/^ /\t/' -i */KconfigSigned-off-by: Krzysztof Kozlowski Signed-off-by: Rafael J. Wysocki List of files: /linux-6.15/drivers/cpuidle/Kconfig

2cffe9f6 - cpuidle: add haltpoll governor

Wed, 03 Jul 2019 23:51:28 +0000

cpuidle: add haltpoll governorThe cpuidle_haltpoll governor, in conjunction with the haltpoll cpuidledriver, allows guest vcpus to poll for a specified amount of time beforehalting.This provides the following benefits to host side polling: 1) The POLL flag is set while polling is performed, which allows a remote vCPU to avoid sending an IPI (and the associated cost of handling the IPI) when performing a wakeup. 2) The VM-exit cost can be avoided.The downside of guest side polling is that polling is performedeven with other runnable tasks in the host.Results comparing halt_poll_ns and server/client applicationwhere a small packet is ping-ponged:host --> 31.33halt_poll_ns=300000 / no guest busy spin --> 33.40 (93.8%)halt_poll_ns=0 / guest_halt_poll_ns=300000 --> 32.73 (95.7%)For the SAP HANA benchmarks (where idle_spin is a parameterof the previous version of the patch, results should be thesame):hpns == halt_poll_ns idle_spin=0/ idle_spin=800/ idle_spin=0/ hpns=200000 hpns=0 hpns=800000DeleteC06T03 (100 thread) 1.76 1.71 (-3%) 1.78 (+1%)InsertC16T02 (100 thread) 2.14 2.07 (-3%) 2.18 (+1.8%)DeleteC00T01 (1 thread) 1.34 1.28 (-4.5%) 1.29 (-3.7%)UpdateC00T03 (1 thread) 4.72 4.18 (-12%) 4.53 (-5%)Signed-off-by: Marcelo Tosatti Signed-off-by: Rafael J. Wysocki List of files: /linux-6.15/drivers/cpuidle/Kconfig

fa86ee90 - add cpuidle-haltpoll driver

Wed, 03 Jul 2019 23:51:25 +0000

add cpuidle-haltpoll driverAdd a cpuidle driver that calls the architecture default_idle routine.To be used in conjunction with the haltpoll governor.Signed-off-by: Marcelo Tosatti Signed-off-by: Rafael J. Wysocki List of files: /linux-6.15/drivers/cpuidle/Kconfig

ec8f24b7 - treewide: Add SPDX license identifier - Makefile/Kconfig

Sun, 19 May 2019 12:07:45 +0000

treewide: Add SPDX license identifier - Makefile/KconfigAdd SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any formThese files fall under the project license, GPL v2 only. The resulting SPDXlicense identifier is: GPL-2.0-onlySigned-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman List of files: /linux-6.15/drivers/cpuidle/Kconfig

b26bf6ab - cpuidle: New timer events oriented governor for tickless systems

Fri, 04 Jan 2019 11:30:47 +0000

cpuidle: New timer events oriented governor for tickless systemsThe venerable menu governor does some things that are quitequestionable in my view.First, it includes timer wakeups in the pattern detection data andmixes them up with wakeups from other sources which in some casescauses it to expect what essentially would be a timer wakeup in atime frame in which no timer wakeups are possible (because it knowsthe time until the next timer event and that is later than theexpected wakeup time).Second, it uses the extra exit latency limit based on the predictedidle duration and depending on the number of tasks waiting on I/O,even though those tasks may run on a different CPU when they arewoken up. Moreover, the time ranges used by it for the sleep lengthcorrection factors depend on whether or not there are tasks waitingon I/O, which again doesn't imply anything in particular, and theyare not correlated to the list of available idle states in any waywhatever.Also, the pattern detection code in menu may end up consideringvalues that are too large to matter at all, in which cases runningit is a waste of time.A major rework of the menu governor would be required to addressthese issues and the performance of at least some workloads (tunedspecifically to the current behavior of the menu governor) is likelyto suffer from that. It is thus better to introduce an entirely newgovernor without them and let everybody use the governor that worksbetter with their actual workloads.The new governor introduced here, the timer events oriented (TEO)governor, uses the same basic strategy as menu: it always tries tofind the deepest idle state that can be used in the given conditions.However, it applies a different approach to that problem.First, it doesn't use "correction factors" for the time till theclosest timer, but instead it tries to correlate the measured idleduration values with the available idle states and use thatinformation to pick up the idle state that is most likely to "match"the upcoming CPU idle interval.Second, it doesn't take the number of "I/O waiters" into account atall and the pattern detection code in it avoids taking timer wakeupsinto account. It also only uses idle duration values less than thecurrent time till the closest timer (with the tick excluded) for thatpurpose.Signed-off-by: Rafael J. Wysocki Acked-by: Daniel Lezcano List of files: /linux-6.15/drivers/cpuidle/Kconfig

10475b34 - cpuidle: Don't enable all governors by default

Mon, 11 Jan 2016 16:43:02 +0000

cpuidle: Don't enable all governors by defaultSince commit d6f346f2d2 (cpuidle: improve governor Kconfig options)the best cpuidle governor is selected automatically. There is littlepoint in additionally selecting the other one as it will not be used,so don't select both governors by default.Being able to select more than one governor is still good fordevelopers booting with cpuidle_sysfs_switch, though.This fixes the second half of kernel BZ #65531.Link: https://bugzilla.kernel.org/show_bug.cgi?id=65531Signed-off-by: Jean Delvare Signed-off-by: Rafael J. Wysocki List of files: /linux-6.15/drivers/cpuidle/Kconfig

0e087044 - ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64

Mon, 02 Feb 2015 15:32:46 +0000

ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64ARM32 and ARM64 have the same DT definitions and the same approaches.The generic ARM cpuidle driver can be put in common for those twoarchitectures.Signed-off-by: Daniel Lezcano Acked-by: Kevin Hilman Acked-by: Rob Herring Acked-by: Lorenzo Pieralisi Tested-by: Lorenzo Pieralisi List of files: /linux-6.15/drivers/cpuidle/Kconfig

3299b63d - drivers: cpuidle: CPU idle ARM64 driver

Fri, 28 Feb 2014 13:03:44 +0000

drivers: cpuidle: CPU idle ARM64 driverThis patch implements a generic CPU idle driver for ARM64 machines.It relies on the DT idle states infrastructure to initialize idlestates count and respective parameters. Current code assumes the driveris managing idle states on all possible CPUs but can be easilygeneralized to support heterogenous systems and build cpumasks atruntime using MIDRs or DT cpu nodes compatible properties.The driver relies on the arm64 CPU operations to call the idleinitialization hook used to parse and save suspend back-end specificidle states information upon probing.Idle state index 0 is always initialized as a simple wfi state, ie alwaysconsidered present and functional on all ARM64 platforms.Idle state indices higher than 0 trigger idle state entry by callingthe cpu_suspend function, that triggers the suspend operation throughthe CPU operations suspend back-end hook. cpu_suspend passes the idlestate index as a parameter so that the CPU operations suspend back-endcan retrieve the required idle state data by using the idle stateindex to execute a look-up on its internal data structures.Reviewed-by: Ashwin Chaugule Reviewed-by: Catalin Marinas Signed-off-by: Lorenzo Pieralisi Signed-off-by: Daniel Lezcano List of files: /linux-6.15/drivers/cpuidle/Kconfig

9f14da34 - drivers: cpuidle: implement DT based idle states infrastructure

Fri, 14 Feb 2014 14:28:39 +0000

drivers: cpuidle: implement DT based idle states infrastructureOn most common ARM systems, the low-power states a CPU can be put into arenot discoverable in HW and require device tree bindings to describepower down suspend operations and idle states parameters.In order to enable DT based idle states and configure idle drivers, thispatch implements the bulk infrastructure required to parse the device treeidle states bindings and initialize the corresponding CPUidle driver statesdata.The parsing API accepts a start index that defines the first idle statethat should be initialized by the parsing code in order to give new andlegacy driver flexibility over which states should be parsed using thenew DT mechanism.The idle states node(s) is obtained from the phandle list of the first cpuin the driver cpumask; the kernel checks that the idle state node phandleis the same for all CPUs in the driver cpumask before declaring the idle stateas valid and start parsing its content.The idle state enter function pointer is initialized through DT matchstructures passed in by the CPUidle driver, so that ARM legacy code cancope with platform specific idle entry method based on compatiblestring matching and the code used to initialize the enter function pointercan be moved to the DT generic layer.Acked-by: Catalin Marinas Acked-by: Daniel Lezcano Signed-off-by: Lorenzo Pieralisi Signed-off-by: Daniel Lezcano List of files: /linux-6.15/drivers/cpuidle/Kconfig

3a4a267e - cpuidle: Remove manual selection of the multiple driver support

Wed, 23 Jul 2014 17:02:47 +0000

cpuidle: Remove manual selection of the multiple driver supportLike the coupled idle state, it is not up to the user to set this optionbut the driver to select it.Remove the interactive selection of this option.Signed-off-by: Daniel Lezcano Signed-off-by: Rafael J. Wysocki List of files: /linux-6.15/drivers/cpuidle/Kconfig

d0508944 - cpuidle: cpuidle-cps: add MIPS CPS cpuidle driver

Mon, 14 Apr 2014 15:25:29 +0000

cpuidle: cpuidle-cps: add MIPS CPS cpuidle driverThis patch adds a cpuidle driver for systems based around the MIPSCoherent Processing System (CPS) architecture. It supports four idlestates: - The standard MIPS wait instruction. - The non-coherent wait, clock gated & power gated states exposed by the recently added pm-cps layer.The pm-cps layer is used to enter all the deep idle states. Since coresin the clock or power gated states cannot service interrupts, thegic_send_ipi_single function is modified to send a power up command forthe appropriate core to the CPC in cases where the target CPU has markeditself potentially incoherent.Signed-off-by: Paul Burton List of files: /linux-6.15/drivers/cpuidle/Kconfig

962e7bd4 - powerpc/pseries/cpuidle: Move processor_idle.c to drivers/cpuidle.

Tue, 14 Jan 2014 10:56:02 +0000

powerpc/pseries/cpuidle: Move processor_idle.c to drivers/cpuidle.Move the file from arch specific pseries/processor_idle.cto drivers/cpuidle/cpuidle-pseries.cMake the relevant Makefile and Kconfig changes.Also, introduce Kconfig.powerpc in drivers/cpuidlefor all powerpc cpuidle drivers.Signed-off-by: Deepthi Dharwar Signed-off-by: Benjamin Herrenschmidt List of files: /linux-6.15/drivers/cpuidle/Kconfig

14d2c34c - cpuidle: big.LITTLE: vexpress-TC2 CPU idle driver

Wed, 12 Jun 2013 15:40:01 +0000

cpuidle: big.LITTLE: vexpress-TC2 CPU idle driverThe big.LITTLE architecture is composed of two clusters of cpus. One clustercontains less powerful but more energy efficient processors and the othercluster groups the powerful but energy-intensive cpus.The TC2 testchip implements two clusters of CPUs (A7 and A15 clusters ina big.LITTLE configuration) connected through a CCI interconnect that managescoherency of their respective L2 caches and intercluster distributedvirtual memory messages (DVM).TC2 testchip integrates a power controller that manages cores resets, wake-upIRQs and cluster low-power states. Power states are managed at clusterlevel, which means that voltage is removed from a cluster iff all coresin a cluster are in a wfi state. Single cores can enter a reset statewhich is identical to wfi in terms of power consumption but simplifies theway cluster states are entered.This patch provides a multiple driver CPU idle implementation for TC2which paves the way for a generic big.LITTLE idle driver for allupcoming big.LITTLE based systems on chip.The driver relies on the MCPM infrastructure to coordinate and managecore power states; in particular MCPM allows to suspend specific coresand hides the CPUs coordination required to shut-down clusters of CPUs.Power down sequences for the respective clusters are implemented in theMCPM TC2 backend, with all code needed to clean caches and exit coherency.The multiple driver CPU idle infrastructure allows to define differentC-states for big and little cores, determined at boot by checking thepart id of the possible CPUs and initializing the respective logicalmasks in the big and little drivers.Current big.little systems are composed of A7 and A15 clusters, asimplemented in TC2, but in the future that may change and the driverwill have evolve to retrieve what is a 'big' cpu and what is a 'little'cpu in order to build the correct topology.Cc: Kevin Hilman Cc: Amit Kucheria Cc: Olof Johansson Cc: Nicolas Pitre Cc: Rafael J. Wysocki Signed-off-by: Daniel Lezcano Signed-off-by: Lorenzo Pieralisi Signed-off-by: Olof Johansson List of files: /linux-6.15/drivers/cpuidle/Kconfig

b98e01ad - cpuidle: Add Kconfig.arm and move calxeda, kirkwood and zynq

Wed, 03 Jul 2013 08:49:55 +0000

cpuidle: Add Kconfig.arm and move calxeda, kirkwood and zynqAdd Kconfig.arm for ARM cpuidle drivers and moves calxeda, kirkwoodand zynq to Kconfig.arm. Like in the cpufreq menu, "CPU Idle" menuis added to drivers/cpuidle/Kconfig.Signed-off-by: Sahara List of files: /linux-6.15/drivers/cpuidle/Kconfig

6eed846f - cpuidle: calxeda: select ARM_CPU_SUSPEND

Tue, 30 Apr 2013 21:00:47 +0000

cpuidle: calxeda: select ARM_CPU_SUSPENDLike other ARM specific drivers, this one requires ARM_CPU_SUSPEND,as shown by this linker error:drivers/built-in.o: In function `calxeda_pwrdown_idle':drivers/cpuidle/cpuidle-calxeda.c:84: undefined reference to `cpu_suspend'drivers/cpuidle/cpuidle-calxeda.c:86: undefined reference to `cpu_resume'Signed-off-by: Arnd Bergmann Acked-by: Rafael J. Wysocki Acked-by: Rob Herring Acked-by: Daniel Lezcano Cc: linux-pm@vger.kernel.org List of files: /linux-6.15/drivers/cpuidle/Kconfig

b39b0981 - cpuidle: Fix ARCH_NEEDS_CPU_IDLE_COUPLED dependency warning

Tue, 11 Jun 2013 08:09:45 +0000

cpuidle: Fix ARCH_NEEDS_CPU_IDLE_COUPLED dependency warningBefore commit d6f346f (cpuidle: improve governor Kconfig options),the CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED option didn't depend onCONFIG_CPU_IDLE but now it has been moved under the CPU_IDLEmenuconfig.That raises the following warnings: warning: (ARCH_OMAP4 && ARCH_TEGRA_2x_SOC) selects ARCH_NEEDS_CPU_IDLE_COUPLED which has unmet direct dependencies (CPU_IDLE) warning: (ARCH_OMAP4 && ARCH_TEGRA_2x_SOC) selects ARCH_NEEDS_CPU_IDLE_COUPLED which has unmet direct dependencies (CPU_IDLE)because the tegra2 and omap4 Kconfig files select this optionwithout checking if CPU_IDLE is set.Fix that by moving ARCH_NEEDS_CPU_IDLE_COUPLED outside of CPU_IDLE.[rjw: Changelog]Signed-off-by: Daniel Lezcano Signed-off-by: Rafael J. Wysocki List of files: /linux-6.15/drivers/cpuidle/Kconfig

bd2a337a - ARM: zynq: Add cpuidle support

Tue, 04 Jun 2013 07:17:39 +0000

ARM: zynq: Add cpuidle supportAdd cpuidle support for Xilinx Zynq.Signed-off-by: Michal Simek Acked-by: Daniel Lezcano Signed-off-by: Rafael J. Wysocki List of files: /linux-6.15/drivers/cpuidle/Kconfig