wireguard-linux/arch/arm64/kernel/cpuidle.c, branch jd/unified-crypt-queue

arm64: Introduce get_cpu_ops() helper function

2020-03-24T17:24:19Z

This introduces get_cpu_ops() to return the CPU operations according to the given CPU index. For now, it simply returns the @cpu_ops[cpu] as before. Also, helper function __cpu_try_die() is introduced to be shared by cpu_die() and ipi_cpu_crash_stop(). So it shouldn't introduce any functional changes. Signed-off-by: Gavin Shan Signed-off-by: Catalin Marinas Acked-by: Mark Rutland

PSCI: cpuidle: Refactor CPU suspend power_state parameter handling

2019-08-09T16:51:39Z

Current PSCI code handles idle state entry through the psci_cpu_suspend_enter() API, that takes an idle state index as a parameter and convert the index into a previously initialized power_state parameter before calling the PSCI.CPU_SUSPEND() with it. This is unwieldly, since it forces the PSCI firmware layer to keep track of power_state parameter for every idle state so that the index->power_state conversion can be made in the PSCI firmware layer instead of the CPUidle driver implementations. Move the power_state handling out of drivers/firmware/psci into the respective ACPI/DT PSCI CPUidle backends and convert the psci_cpu_suspend_enter() API to get the power_state parameter as input, which makes it closer to its firmware interface PSCI.CPU_SUSPEND() API. A notable side effect is that the PSCI ACPI/DT CPUidle backends now can directly handle (and if needed update) power_state parameters before handing them over to the PSCI firmware interface to trigger PSCI.CPU_SUSPEND() calls. Signed-off-by: Lorenzo Pieralisi Acked-by: Daniel Lezcano Reviewed-by: Ulf Hansson Reviewed-by: Sudeep Holla Cc: Will Deacon Cc: Ulf Hansson Cc: Sudeep Holla Cc: Daniel Lezcano Cc: Catalin Marinas Cc: Mark Rutland Cc: "Rafael J. Wysocki" Signed-off-by: Will Deacon

ARM: psci: cpuidle: Enable PSCI CPUidle driver

2019-08-09T16:51:39Z

Allow selection of the PSCI CPUidle in the kernel by updating the respective Kconfig entry. Remove PSCI callbacks from ARM/ARM64 generic CPU ops to prevent the PSCI idle driver from clashing with the generic ARM CPUidle driver initialization, that relies on CPU ops to initialize and enter idle states. Signed-off-by: Lorenzo Pieralisi Reviewed-by: Ulf Hansson Cc: Will Deacon Cc: Ulf Hansson Cc: Sudeep Holla Cc: Daniel Lezcano Cc: Catalin Marinas Cc: Mark Rutland Cc: "Rafael J. Wysocki" Signed-off-by: Will Deacon

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

2019-06-19T15:09:55Z

Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Enrico Weigelt Reviewed-by: Kate Stewart Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman

ARM64 / cpuidle: Use new cpuidle macro for entering retention state

2018-01-02T13:50:34Z

CPU_PM_CPU_IDLE_ENTER_RETENTION skips calling cpu_pm_enter() and cpu_pm_exit(). By not calling cpu_pm functions in idle entry/exit paths we can reduce the latency involved in entering and exiting the low power idle state. On ARM64 based Qualcomm server platform we measured below overhead for calling cpu_pm_enter and cpu_pm_exit for retention states. workload: stress --hdd #CPUs --hdd-bytes 32M -t 30 Average overhead of cpu_pm_enter - 1.2us Average overhead of cpu_pm_exit - 3.1us Acked-by: Sudeep Holla Signed-off-by: Prashanth Prakash Signed-off-by: Catalin Marinas

arm64: kernel: Update kerneldoc for cpu_suspend() rename

2017-03-10T18:06:24Z

Commit af391b15f7b56ce1 ("arm64: kernel: rename __cpu_suspend to keep it aligned with arm") renamed cpu_suspend() to arm_cpuidle_suspend(), but forgot to update the kerneldoc header. Fixes: af391b15f7b56ce1 ("arm64: kernel: rename __cpu_suspend to keep it aligned with arm") Signed-off-by: Geert Uytterhoeven Signed-off-by: Will Deacon

arm64: add support for ACPI Low Power Idle(LPI)

2016-07-21T21:29:38Z

This patch adds appropriate callbacks to support ACPI Low Power Idle (LPI) on ARM64. Acked-by: Catalin Marinas Acked-by: Lorenzo Pieralisi Signed-off-by: Sudeep Holla Signed-off-by: Rafael J. Wysocki

arm64: cpuidle: drop __init section marker to arm_cpuidle_init

2016-07-21T21:29:37Z

Commit ea389daa7fd9 (arm64: cpuidle: add __init section marker to arm_cpuidle_init) added the __init annotation to arm_cpuidle_init as it was not needed after booting which was correct at that time. However with the introduction of ACPI LPI support, this will be used from cpuhotplug path in ACPI processor driver. This patch drops the __init annotation from arm_cpuidle_init to avoid the following warning: WARNING: vmlinux.o(.text+0x113c8): Section mismatch in reference from the function acpi_processor_ffh_lpi_probe() to the function .init.text:arm_cpuidle_init() The function acpi_processor_ffh_lpi_probe() references the function __init arm_cpuidle_init(). This is often because acpi_processor_ffh_lpi_probe() lacks a __init annotation or the annotation of arm_cpuidle_init is wrong. Acked-by: Catalin Marinas Acked-by: Lorenzo Pieralisi Signed-off-by: Sudeep Holla Signed-off-by: Rafael J. Wysocki

arm64: cpuidle: make arm_cpuidle_suspend() a bit more efficient

2016-04-13T13:49:23Z

Currently, we check two pointers: cpu_ops and cpu_suspend on every idle state entry. These pointers check can be avoided: If cpu_ops has not been registered, arm_cpuidle_init() will return -EOPNOTSUPP, so arm_cpuidle_suspend() will never have chance to run. In other word, the cpu_ops check can be avoid. Similarly, the cpu_suspend check could be avoided in this hot path by moving it into arm_cpuidle_init(). I measured the 4096 * time from arm_cpuidle_suspend entry point to the cpu_psci_cpu_suspend entry point. HW platform is Marvell BG4CT STB board. 1. only one shell, no other process, hot-unplug secondary cpus, execute the following cmd while true do sleep 0.2 done before the patch: 1581220ns after the patch: 1579630ns reduced by 0.1% 2. only one shell, no other process, hot-unplug secondary cpus, execute the following cmd while true do md5sum /tmp/testfile sleep 0.2 done NOTE: the testfile size should be larger than L1+L2 cache size before the patch: 1961960ns after the patch: 1912500ns reduced by 2.5% So the more complex the system load, the bigger the improvement. Signed-off-by: Jisheng Zhang Acked-by: Lorenzo Pieralisi Signed-off-by: Will Deacon

arm64: cpuidle: add __init section marker to arm_cpuidle_init

2015-07-02T16:44:27Z

It is not needed after booting, this patch moves the arm_cpuidle_init() function to the __init section. Signed-off-by: Jisheng Zhang Reviewed-by: Krzysztof Kozlowski Signed-off-by: Catalin Marinas