BMC/Intel-BMC/linux.git/arch/arm64/kernel/cpuidle.c, branch dev-5.2

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

2019-06-19T15:09:55+00:00

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

2018-01-02T13:50:34+00:00

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

2017-03-10T18:06:24+00:00

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)

2016-07-21T21:29:38+00:00

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

2016-07-21T21:29:37+00:00

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

2016-04-13T13:49:23+00:00

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

2015-07-02T16:44:27+00:00

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

arm64: kernel: rename __cpu_suspend to keep it aligned with arm

2015-06-19T13:46:39+00:00

This patch renames __cpu_suspend to cpu_suspend so that it's aligned with ARM32. It also removes the redundant wrapper created. This is in preparation to implement generic PSCI system suspend using the cpu_{suspend,resume} which now has the same interface on both ARM and ARM64. Cc: Mark Rutland Reviewed-by: Lorenzo Pieralisi Reviewed-by: Ashwin Chaugule Signed-off-by: Sudeep Holla Signed-off-by: Catalin Marinas

ARM64: kernel: make cpu_ops hooks DT agnostic

2015-05-19T15:09:29+00:00

ARM64 CPU operations such as cpu_init and cpu_init_idle take a struct device_node pointer as a parameter, which corresponds to the device tree node of the logical cpu on which the operation has to be applied. With the advent of ACPI on arm64, where MADT static table entries are used to initialize cpus, the device tree node parameter in cpu_ops hooks become useless when booting with ACPI, since in that case cpu device tree nodes are not present and can not be used for cpu initialization. The current cpu_init hook requires a struct device_node pointer parameter because it is called while parsing the device tree to initialize CPUs, when the cpu_logical_map (that is used to match a cpu node reg property to a device tree node) for a given logical cpu id is not set up yet. This means that the cpu_init hook cannot rely on the of_get_cpu_node function to retrieve the device tree node corresponding to the logical cpu id passed in as parameter, so the cpu device tree node must be passed in as a parameter to fix this catch-22 dependency cycle. This patch reshuffles the cpu_logical_map initialization code so that the cpu_init cpu_ops hook can safely use the of_get_cpu_node function to retrieve the cpu device tree node, removing the need for the device tree node pointer parameter. In the process, the patch removes device tree node parameters from all cpu_ops hooks, in preparation for SMP DT/ACPI cpus initialization consolidation. Signed-off-by: Lorenzo Pieralisi Acked-by: Hanjun Guo Acked-by: Sudeep Holla Acked-by: Mark Rutland Tested-by: Hanjun Guo Tested-by: Mark Rutland [DT] Cc: Will Deacon Signed-off-by: Catalin Marinas

ARM64: cpuidle: Rename cpu_init_idle to a common function name

2015-03-24T09:16:09+00:00

With this change the cpuidle-arm64.c file calls the same function name for both ARM and ARM64. Signed-off-by: Daniel Lezcano Acked-by: Kevin Hilman Acked-by: Rob Herring Acked-by: Catalin Marinas Tested-by: Lorenzo Pieralisi