cpuidle: hisi-cpuidle: add hisilicon cpuidle driver
This driver is to support multiple governor for different idle state parameters for two clusters. This is a temporary driver, and should fix cpuidle-arm.c to support two clusters with different idle states. Signed-off-by: Leo Yan <leo.yan@linaro.org>
This commit is contained in:
Leo Yan
John Stultz
@@ -37,6 +37,18 @@ config ARM_HIGHBANK_CPUIDLE
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help
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Select this to enable cpuidle on Calxeda processors.
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config ARM_HISI_CPUIDLE
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bool "Support for Hisilicon big.LITTLE processors"
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depends on ARCH_HISI
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select ARM_CPU_SUSPEND
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select CPU_IDLE_MULTIPLE_DRIVERS
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select DT_IDLE_STATES
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help
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Select this option to enable CPU idle driver for big.LITTLE based
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ARM systems. Driver manages CPUs coordination through MCPM and
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define different C-states for little and big cores through the
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multiple CPU idle drivers infrastructure.
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config ARM_KIRKWOOD_CPUIDLE
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bool "CPU Idle Driver for Marvell Kirkwood SoCs"
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depends on MACH_KIRKWOOD && !ARM64
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@@ -18,6 +18,7 @@ obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o
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obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o
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obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o
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obj-$(CONFIG_ARM_CPUIDLE) += cpuidle-arm.o
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obj-$(CONFIG_ARM_HISI_CPUIDLE) += cpuidle-hisi.o
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###############################################################################
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# MIPS drivers
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@@ -0,0 +1,292 @@
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/*
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* ARM64 generic CPU idle driver.
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*
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* Copyright (C) 2014 ARM Ltd.
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* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) "CPUidle arm64: " fmt
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#include <linux/cpuidle.h>
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#include <linux/cpumask.h>
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#include <linux/cpu_pm.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include <asm/cpuidle.h>
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#include <asm/suspend.h>
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#include <linux/version.h>
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#include <linux/sched.h>
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#include <linux/cpu.h>
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#include "dt_idle_states.h"
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#ifdef CONFIG_HISI_CORESIGHT_TRACE
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#include <linux/coresight.h>
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#endif
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enum {
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LITTLE_CLUSTER_ID = 0,
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BIG_CLUSTER_ID,
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MAX_CLUSTER_ID,
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};
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/*
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* hisi_enter_idle_state - Programs CPU to enter the specified state
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*
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* dev: cpuidle device
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* drv: cpuidle driver
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* idx: state index
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*
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* Called from the CPUidle framework to program the device to the
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* specified target state selected by the governor.
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*/
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extern int real_enable_cpuidle;
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static int hisi_enter_idle_state(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int idx)
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{
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int ret;
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if (need_resched()) {
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return idx;
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}
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if (!idx) {
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cpu_do_idle();
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return idx;
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}
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ret = cpu_pm_enter();
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if (!ret) {
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#ifdef CONFIG_ARCH_HISI
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local_fiq_disable();
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#endif
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/*
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* Pass idle state index to cpu_suspend which in turn will
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* call the CPU ops suspend protocol with idle index as a
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* parameter.
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*/
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ret = arm_cpuidle_suspend(idx);
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#ifdef CONFIG_HISI_CORESIGHT_TRACE
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/*Restore ETM registers */
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_etm4_cpuilde_restore();
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#endif
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#ifdef CONFIG_ARCH_HISI
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local_fiq_enable();
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#endif
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cpu_pm_exit();
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}
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return ret ? -1 : idx;
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}
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static struct cpuidle_driver hisi_little_cluster_idle_driver = {
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.name = "hisi_little_cluster_idle",
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.owner = THIS_MODULE,
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/*
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* State at index 0 is standby wfi and considered standard
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* on all ARM platforms. If in some platforms simple wfi
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* can't be used as "state 0", DT bindings must be implemented
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* to work around this issue and allow installing a special
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* handler for idle state index 0.
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*/
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.states[0] = {
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.enter = hisi_enter_idle_state,
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.exit_latency = 1,
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.target_residency = 1,
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.power_usage = UINT_MAX,
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4,1,14)
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.flags = CPUIDLE_FLAG_TIME_VALID,
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#endif
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.name = "WFI",
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.desc = "ARM64 WFI",
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}
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};
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static struct cpuidle_driver hisi_big_cluster_idle_driver = {
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.name = "hisi_big_cluster_idle",
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.owner = THIS_MODULE,
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/*
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* State at index 0 is standby wfi and considered standard
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* on all ARM platforms. If in some platforms simple wfi
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* can't be used as "state 0", DT bindings must be implemented
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* to work around this issue and allow installing a special
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* handler for idle state index 0.
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*/
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.states[0] = {
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.enter = hisi_enter_idle_state,
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.exit_latency = 1,
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.target_residency = 1,
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.power_usage = UINT_MAX,
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4,1,14)
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.flags = CPUIDLE_FLAG_TIME_VALID,
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#endif
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.name = "WFI",
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.desc = "ARM64 WFI",
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}
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};
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static const struct of_device_id arm64_idle_state_match[] __initconst = {
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{ .compatible = "arm,idle-state",
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.data = hisi_enter_idle_state },
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{ },
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};
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static int __init hisi_idle_drv_cpumask_init(struct cpuidle_driver *drv, int cluster_id)
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{
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struct cpumask *cpumask;
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int cpu;
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cpumask = kzalloc(cpumask_size(), GFP_KERNEL);
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if (!cpumask)
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return -ENOMEM;
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for_each_possible_cpu(cpu) {
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if (cpu_topology[cpu].cluster_id == cluster_id)
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cpumask_set_cpu(cpu, cpumask);
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}
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drv->cpumask = cpumask;
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return 0;
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}
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static void __init hisi_idle_drv_cpumask_uninit(struct cpuidle_driver *drv)
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{
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kfree(drv->cpumask);
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}
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static int __init hisi_idle_drv_init(struct cpuidle_driver *drv)
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{
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int cpu, ret;
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/*
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* Initialize idle states data, starting at index 1.
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* This driver is DT only, if no DT idle states are detected (ret == 0)
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* let the driver initialization fail accordingly since there is no
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* reason to initialize the idle driver if only wfi is supported.
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*/
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ret = dt_init_idle_driver(drv, arm64_idle_state_match, 1);
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if (ret <= 0) {
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if (ret)
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pr_err("failed to initialize idle states\n");
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return ret ? : -ENODEV;
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}
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/*
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* Call arch CPU operations in order to initialize
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* idle states suspend back-end specific data
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*/
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for_each_possible_cpu(cpu) {
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,14)
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ret = arm_cpuidle_init(cpu);
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#else
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ret = cpu_init_idle(cpu);
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#endif
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if (ret) {
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pr_err("CPU %d failed to init idle CPU ops\n", cpu);
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return ret;
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}
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}
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ret = cpuidle_register(drv, NULL);
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if (ret) {
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pr_err("failed to register cpuidle driver\n");
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return ret;
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}
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return 0;
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}
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static int __init hisi_multidrv_idle_init(struct cpuidle_driver *drv, int cluster_id)
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{
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int ret;
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if (cluster_id >= MAX_CLUSTER_ID) {
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pr_err("cluster id is out of range.\n");
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return -ENODEV;
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}
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ret = hisi_idle_drv_cpumask_init(drv, cluster_id);
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if (ret) {
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pr_err("fail to init idle driver!\n");
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return ret;
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}
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ret = hisi_idle_drv_init(drv);
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if (ret) {
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hisi_idle_drv_cpumask_uninit(drv);
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pr_err("fail to register cluster%d cpuidle drv.\n", cluster_id);
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return ret;
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}
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return 0;
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}
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static int cpuidle_decoup_hotplug_notify(struct notifier_block *nb,
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unsigned long action, void *hcpu)
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{
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if(action & CPU_TASKS_FROZEN)
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return NOTIFY_OK;
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switch (action & ~CPU_TASKS_FROZEN) {
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case CPU_UP_PREPARE:
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case CPU_DOWN_PREPARE:
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cpuidle_pause();
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break;
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case CPU_DOWN_FAILED:
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case CPU_UP_CANCELED:
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case CPU_ONLINE:
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case CPU_DEAD:
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cpuidle_resume();
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kick_all_cpus_sync();
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break;
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default:
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break;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block cpuidle_decoup_hotplug_notifier = {
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.notifier_call = cpuidle_decoup_hotplug_notify,
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};
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/*
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* hisi_idle_init
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*
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* Registers the hisi multi cpuidle driver with the cpuidle
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* framework. It relies on core code to parse the idle states
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* and initialize them using driver data structures accordingly.
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*/
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static int __init hisi_idle_init(void)
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{
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int ret;
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ret = hisi_multidrv_idle_init(&hisi_little_cluster_idle_driver, LITTLE_CLUSTER_ID);
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if (ret) {
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pr_err("fail to register little cluster cpuidle drv.\n");
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return ret;
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}
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ret = hisi_multidrv_idle_init(&hisi_big_cluster_idle_driver, BIG_CLUSTER_ID);
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if (ret) {
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pr_err("fail to register big cluster cpuidle drv.\n");
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return ret;
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}
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,14)
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ret = register_cpu_notifier(&cpuidle_decoup_hotplug_notifier);
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if (ret) {
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pr_err("fail to register cpuidle_coupled_cpu_notifier.\n");
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return ret;
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}
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#endif
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return 0;
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}
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device_initcall(hisi_idle_init);
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