Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Ulf Hansson | 958 | 57.30% | 15 | 51.72% |
Lorenzo Pieralisi | 653 | 39.06% | 4 | 13.79% |
Mark Rutland | 23 | 1.38% | 2 | 6.90% |
Will Deacon | 12 | 0.72% | 2 | 6.90% |
Daniel Lezcano | 8 | 0.48% | 1 | 3.45% |
Sudeep Holla | 6 | 0.36% | 1 | 3.45% |
Thomas Gleixner | 5 | 0.30% | 1 | 3.45% |
Frédéric Weisbecker | 4 | 0.24% | 1 | 3.45% |
Ashwin Chaugule | 2 | 0.12% | 1 | 3.45% |
Christoph Lameter | 1 | 0.06% | 1 | 3.45% |
Total | 1672 | 29 |
// SPDX-License-Identifier: GPL-2.0-only /* * PSCI CPU idle driver. * * Copyright (C) 2019 ARM Ltd. * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> */ #define pr_fmt(fmt) "CPUidle PSCI: " fmt #include <linux/cpuhotplug.h> #include <linux/cpu_cooling.h> #include <linux/cpuidle.h> #include <linux/cpumask.h> #include <linux/cpu_pm.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/psci.h> #include <linux/pm_domain.h> #include <linux/pm_runtime.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/syscore_ops.h> #include <asm/cpuidle.h> #include "cpuidle-psci.h" #include "dt_idle_states.h" struct psci_cpuidle_data { u32 *psci_states; struct device *dev; }; static DEFINE_PER_CPU_READ_MOSTLY(struct psci_cpuidle_data, psci_cpuidle_data); static DEFINE_PER_CPU(u32, domain_state); static bool psci_cpuidle_use_cpuhp; void psci_set_domain_state(u32 state) { __this_cpu_write(domain_state, state); } static inline u32 psci_get_domain_state(void) { return __this_cpu_read(domain_state); } static inline int psci_enter_state(int idx, u32 state) { return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter, idx, state); } static int __psci_enter_domain_idle_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, int idx, bool s2idle) { struct psci_cpuidle_data *data = this_cpu_ptr(&psci_cpuidle_data); u32 *states = data->psci_states; struct device *pd_dev = data->dev; u32 state; int ret; ret = cpu_pm_enter(); if (ret) return -1; /* Do runtime PM to manage a hierarchical CPU toplogy. */ ct_irq_enter_irqson(); if (s2idle) dev_pm_genpd_suspend(pd_dev); else pm_runtime_put_sync_suspend(pd_dev); ct_irq_exit_irqson(); state = psci_get_domain_state(); if (!state) state = states[idx]; ret = psci_cpu_suspend_enter(state) ? -1 : idx; ct_irq_enter_irqson(); if (s2idle) dev_pm_genpd_resume(pd_dev); else pm_runtime_get_sync(pd_dev); ct_irq_exit_irqson(); cpu_pm_exit(); /* Clear the domain state to start fresh when back from idle. */ psci_set_domain_state(0); return ret; } static int psci_enter_domain_idle_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, int idx) { return __psci_enter_domain_idle_state(dev, drv, idx, false); } static int psci_enter_s2idle_domain_idle_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, int idx) { return __psci_enter_domain_idle_state(dev, drv, idx, true); } static int psci_idle_cpuhp_up(unsigned int cpu) { struct device *pd_dev = __this_cpu_read(psci_cpuidle_data.dev); if (pd_dev) pm_runtime_get_sync(pd_dev); return 0; } static int psci_idle_cpuhp_down(unsigned int cpu) { struct device *pd_dev = __this_cpu_read(psci_cpuidle_data.dev); if (pd_dev) { pm_runtime_put_sync(pd_dev); /* Clear domain state to start fresh at next online. */ psci_set_domain_state(0); } return 0; } static void psci_idle_syscore_switch(bool suspend) { bool cleared = false; struct device *dev; int cpu; for_each_possible_cpu(cpu) { dev = per_cpu_ptr(&psci_cpuidle_data, cpu)->dev; if (dev && suspend) { dev_pm_genpd_suspend(dev); } else if (dev) { dev_pm_genpd_resume(dev); /* Account for userspace having offlined a CPU. */ if (pm_runtime_status_suspended(dev)) pm_runtime_set_active(dev); /* Clear domain state to re-start fresh. */ if (!cleared) { psci_set_domain_state(0); cleared = true; } } } } static int psci_idle_syscore_suspend(void) { psci_idle_syscore_switch(true); return 0; } static void psci_idle_syscore_resume(void) { psci_idle_syscore_switch(false); } static struct syscore_ops psci_idle_syscore_ops = { .suspend = psci_idle_syscore_suspend, .resume = psci_idle_syscore_resume, }; static void psci_idle_init_cpuhp(void) { int err; if (!psci_cpuidle_use_cpuhp) return; register_syscore_ops(&psci_idle_syscore_ops); err = cpuhp_setup_state_nocalls(CPUHP_AP_CPU_PM_STARTING, "cpuidle/psci:online", psci_idle_cpuhp_up, psci_idle_cpuhp_down); if (err) pr_warn("Failed %d while setup cpuhp state\n", err); } static int psci_enter_idle_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, int idx) { u32 *state = __this_cpu_read(psci_cpuidle_data.psci_states); return psci_enter_state(idx, state[idx]); } static const struct of_device_id psci_idle_state_match[] = { { .compatible = "arm,idle-state", .data = psci_enter_idle_state }, { }, }; int psci_dt_parse_state_node(struct device_node *np, u32 *state) { int err = of_property_read_u32(np, "arm,psci-suspend-param", state); if (err) { pr_warn("%pOF missing arm,psci-suspend-param property\n", np); return err; } if (!psci_power_state_is_valid(*state)) { pr_warn("Invalid PSCI power state %#x\n", *state); return -EINVAL; } return 0; } static int psci_dt_cpu_init_topology(struct cpuidle_driver *drv, struct psci_cpuidle_data *data, unsigned int state_count, int cpu) { /* Currently limit the hierarchical topology to be used in OSI mode. */ if (!psci_has_osi_support()) return 0; data->dev = psci_dt_attach_cpu(cpu); if (IS_ERR_OR_NULL(data->dev)) return PTR_ERR_OR_ZERO(data->dev); /* * Using the deepest state for the CPU to trigger a potential selection * of a shared state for the domain, assumes the domain states are all * deeper states. */ drv->states[state_count - 1].enter = psci_enter_domain_idle_state; drv->states[state_count - 1].enter_s2idle = psci_enter_s2idle_domain_idle_state; psci_cpuidle_use_cpuhp = true; return 0; } static int psci_dt_cpu_init_idle(struct device *dev, struct cpuidle_driver *drv, struct device_node *cpu_node, unsigned int state_count, int cpu) { int i, ret = 0; u32 *psci_states; struct device_node *state_node; struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu); state_count++; /* Add WFI state too */ psci_states = devm_kcalloc(dev, state_count, sizeof(*psci_states), GFP_KERNEL); if (!psci_states) return -ENOMEM; for (i = 1; i < state_count; i++) { state_node = of_get_cpu_state_node(cpu_node, i - 1); if (!state_node) break; ret = psci_dt_parse_state_node(state_node, &psci_states[i]); of_node_put(state_node); if (ret) return ret; pr_debug("psci-power-state %#x index %d\n", psci_states[i], i); } if (i != state_count) return -ENODEV; /* Initialize optional data, used for the hierarchical topology. */ ret = psci_dt_cpu_init_topology(drv, data, state_count, cpu); if (ret < 0) return ret; /* Idle states parsed correctly, store them in the per-cpu struct. */ data->psci_states = psci_states; return 0; } static int psci_cpu_init_idle(struct device *dev, struct cpuidle_driver *drv, unsigned int cpu, unsigned int state_count) { struct device_node *cpu_node; int ret; /* * If the PSCI cpu_suspend function hook has not been initialized * idle states must not be enabled, so bail out */ if (!psci_ops.cpu_suspend) return -EOPNOTSUPP; cpu_node = of_cpu_device_node_get(cpu); if (!cpu_node) return -ENODEV; ret = psci_dt_cpu_init_idle(dev, drv, cpu_node, state_count, cpu); of_node_put(cpu_node); return ret; } static void psci_cpu_deinit_idle(int cpu) { struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu); psci_dt_detach_cpu(data->dev); psci_cpuidle_use_cpuhp = false; } static int psci_idle_init_cpu(struct device *dev, int cpu) { struct cpuidle_driver *drv; struct device_node *cpu_node; const char *enable_method; int ret = 0; cpu_node = of_cpu_device_node_get(cpu); if (!cpu_node) return -ENODEV; /* * Check whether the enable-method for the cpu is PSCI, fail * if it is not. */ enable_method = of_get_property(cpu_node, "enable-method", NULL); if (!enable_method || (strcmp(enable_method, "psci"))) ret = -ENODEV; of_node_put(cpu_node); if (ret) return ret; drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); if (!drv) return -ENOMEM; drv->name = "psci_idle"; drv->owner = THIS_MODULE; drv->cpumask = (struct cpumask *)cpumask_of(cpu); /* * PSCI idle states relies on architectural WFI to be represented as * state index 0. */ drv->states[0].enter = psci_enter_idle_state; drv->states[0].exit_latency = 1; drv->states[0].target_residency = 1; drv->states[0].power_usage = UINT_MAX; strcpy(drv->states[0].name, "WFI"); strcpy(drv->states[0].desc, "ARM WFI"); /* * If no DT idle states are detected (ret == 0) let the driver * initialization fail accordingly since there is no reason to * initialize the idle driver if only wfi is supported, the * default archictectural back-end already executes wfi * on idle entry. */ ret = dt_init_idle_driver(drv, psci_idle_state_match, 1); if (ret <= 0) return ret ? : -ENODEV; /* * Initialize PSCI idle states. */ ret = psci_cpu_init_idle(dev, drv, cpu, ret); if (ret) { pr_err("CPU %d failed to PSCI idle\n", cpu); return ret; } ret = cpuidle_register(drv, NULL); if (ret) goto deinit; cpuidle_cooling_register(drv); return 0; deinit: psci_cpu_deinit_idle(cpu); return ret; } /* * psci_idle_probe - Initializes PSCI cpuidle driver * * Initializes PSCI cpuidle driver for all CPUs, if any CPU fails * to register cpuidle driver then rollback to cancel all CPUs * registration. */ static int psci_cpuidle_probe(struct platform_device *pdev) { int cpu, ret; struct cpuidle_driver *drv; struct cpuidle_device *dev; for_each_possible_cpu(cpu) { ret = psci_idle_init_cpu(&pdev->dev, cpu); if (ret) goto out_fail; } psci_idle_init_cpuhp(); return 0; out_fail: while (--cpu >= 0) { dev = per_cpu(cpuidle_devices, cpu); drv = cpuidle_get_cpu_driver(dev); cpuidle_unregister(drv); psci_cpu_deinit_idle(cpu); } return ret; } static struct platform_driver psci_cpuidle_driver = { .probe = psci_cpuidle_probe, .driver = { .name = "psci-cpuidle", }, }; static int __init psci_idle_init(void) { struct platform_device *pdev; int ret; ret = platform_driver_register(&psci_cpuidle_driver); if (ret) return ret; pdev = platform_device_register_simple("psci-cpuidle", -1, NULL, 0); if (IS_ERR(pdev)) { platform_driver_unregister(&psci_cpuidle_driver); return PTR_ERR(pdev); } return 0; } device_initcall(psci_idle_init);
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