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2951 lines
77 KiB
2951 lines
77 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/drivers/cpufreq/cpufreq.c |
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* |
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* Copyright (C) 2001 Russell King |
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* (C) 2002 - 2003 Dominik Brodowski <[email protected]> |
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* (C) 2013 Viresh Kumar <[email protected]> |
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* |
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* Oct 2005 - Ashok Raj <[email protected]> |
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* Added handling for CPU hotplug |
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* Feb 2006 - Jacob Shin <[email protected]> |
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* Fix handling for CPU hotplug -- affected CPUs |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/cpu.h> |
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#include <linux/cpufreq.h> |
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#include <linux/cpu_cooling.h> |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/init.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/pm_qos.h> |
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#include <linux/slab.h> |
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#include <linux/suspend.h> |
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#include <linux/syscore_ops.h> |
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#include <linux/tick.h> |
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#include <linux/units.h> |
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#include <trace/events/power.h> |
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|
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static LIST_HEAD(cpufreq_policy_list); |
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|
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/* Macros to iterate over CPU policies */ |
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#define for_each_suitable_policy(__policy, __active) \ |
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list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) \ |
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if ((__active) == !policy_is_inactive(__policy)) |
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|
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#define for_each_active_policy(__policy) \ |
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for_each_suitable_policy(__policy, true) |
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#define for_each_inactive_policy(__policy) \ |
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for_each_suitable_policy(__policy, false) |
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|
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/* Iterate over governors */ |
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static LIST_HEAD(cpufreq_governor_list); |
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#define for_each_governor(__governor) \ |
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list_for_each_entry(__governor, &cpufreq_governor_list, governor_list) |
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|
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static char default_governor[CPUFREQ_NAME_LEN]; |
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|
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/* |
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* The "cpufreq driver" - the arch- or hardware-dependent low |
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* level driver of CPUFreq support, and its spinlock. This lock |
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* also protects the cpufreq_cpu_data array. |
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*/ |
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static struct cpufreq_driver *cpufreq_driver; |
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static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data); |
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static DEFINE_RWLOCK(cpufreq_driver_lock); |
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|
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static DEFINE_STATIC_KEY_FALSE(cpufreq_freq_invariance); |
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bool cpufreq_supports_freq_invariance(void) |
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{ |
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return static_branch_likely(&cpufreq_freq_invariance); |
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} |
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|
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/* Flag to suspend/resume CPUFreq governors */ |
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static bool cpufreq_suspended; |
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|
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static inline bool has_target(void) |
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{ |
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return cpufreq_driver->target_index || cpufreq_driver->target; |
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} |
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|
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/* internal prototypes */ |
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static unsigned int __cpufreq_get(struct cpufreq_policy *policy); |
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static int cpufreq_init_governor(struct cpufreq_policy *policy); |
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static void cpufreq_exit_governor(struct cpufreq_policy *policy); |
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static void cpufreq_governor_limits(struct cpufreq_policy *policy); |
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static int cpufreq_set_policy(struct cpufreq_policy *policy, |
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struct cpufreq_governor *new_gov, |
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unsigned int new_pol); |
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|
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/* |
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* Two notifier lists: the "policy" list is involved in the |
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* validation process for a new CPU frequency policy; the |
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* "transition" list for kernel code that needs to handle |
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* changes to devices when the CPU clock speed changes. |
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* The mutex locks both lists. |
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*/ |
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static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); |
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SRCU_NOTIFIER_HEAD_STATIC(cpufreq_transition_notifier_list); |
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|
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static int off __read_mostly; |
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static int cpufreq_disabled(void) |
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{ |
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return off; |
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} |
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void disable_cpufreq(void) |
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{ |
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off = 1; |
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} |
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static DEFINE_MUTEX(cpufreq_governor_mutex); |
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|
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bool have_governor_per_policy(void) |
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{ |
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return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); |
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} |
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EXPORT_SYMBOL_GPL(have_governor_per_policy); |
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static struct kobject *cpufreq_global_kobject; |
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|
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struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy) |
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{ |
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if (have_governor_per_policy()) |
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return &policy->kobj; |
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else |
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return cpufreq_global_kobject; |
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} |
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EXPORT_SYMBOL_GPL(get_governor_parent_kobj); |
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|
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static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) |
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{ |
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struct kernel_cpustat kcpustat; |
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u64 cur_wall_time; |
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u64 idle_time; |
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u64 busy_time; |
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cur_wall_time = jiffies64_to_nsecs(get_jiffies_64()); |
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kcpustat_cpu_fetch(&kcpustat, cpu); |
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busy_time = kcpustat.cpustat[CPUTIME_USER]; |
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busy_time += kcpustat.cpustat[CPUTIME_SYSTEM]; |
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busy_time += kcpustat.cpustat[CPUTIME_IRQ]; |
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busy_time += kcpustat.cpustat[CPUTIME_SOFTIRQ]; |
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busy_time += kcpustat.cpustat[CPUTIME_STEAL]; |
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busy_time += kcpustat.cpustat[CPUTIME_NICE]; |
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idle_time = cur_wall_time - busy_time; |
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if (wall) |
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*wall = div_u64(cur_wall_time, NSEC_PER_USEC); |
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return div_u64(idle_time, NSEC_PER_USEC); |
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} |
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u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy) |
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{ |
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u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL); |
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|
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if (idle_time == -1ULL) |
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return get_cpu_idle_time_jiffy(cpu, wall); |
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else if (!io_busy) |
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idle_time += get_cpu_iowait_time_us(cpu, wall); |
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return idle_time; |
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} |
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EXPORT_SYMBOL_GPL(get_cpu_idle_time); |
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|
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/* |
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* This is a generic cpufreq init() routine which can be used by cpufreq |
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* drivers of SMP systems. It will do following: |
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* - validate & show freq table passed |
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* - set policies transition latency |
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* - policy->cpus with all possible CPUs |
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*/ |
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void cpufreq_generic_init(struct cpufreq_policy *policy, |
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struct cpufreq_frequency_table *table, |
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unsigned int transition_latency) |
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{ |
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policy->freq_table = table; |
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policy->cpuinfo.transition_latency = transition_latency; |
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|
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/* |
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* The driver only supports the SMP configuration where all processors |
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* share the clock and voltage and clock. |
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*/ |
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cpumask_setall(policy->cpus); |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_generic_init); |
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|
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struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
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{ |
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struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
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return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL; |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw); |
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|
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unsigned int cpufreq_generic_get(unsigned int cpu) |
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{ |
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struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); |
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|
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if (!policy || IS_ERR(policy->clk)) { |
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pr_err("%s: No %s associated to cpu: %d\n", |
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__func__, policy ? "clk" : "policy", cpu); |
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return 0; |
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} |
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return clk_get_rate(policy->clk) / 1000; |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_generic_get); |
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|
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/** |
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* cpufreq_cpu_get - Return policy for a CPU and mark it as busy. |
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* @cpu: CPU to find the policy for. |
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* |
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* Call cpufreq_cpu_get_raw() to obtain a cpufreq policy for @cpu and increment |
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* the kobject reference counter of that policy. Return a valid policy on |
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* success or NULL on failure. |
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* |
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* The policy returned by this function has to be released with the help of |
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* cpufreq_cpu_put() to balance its kobject reference counter properly. |
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*/ |
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struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
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{ |
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struct cpufreq_policy *policy = NULL; |
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unsigned long flags; |
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|
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if (WARN_ON(cpu >= nr_cpu_ids)) |
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return NULL; |
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|
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/* get the cpufreq driver */ |
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read_lock_irqsave(&cpufreq_driver_lock, flags); |
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|
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if (cpufreq_driver) { |
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/* get the CPU */ |
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policy = cpufreq_cpu_get_raw(cpu); |
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if (policy) |
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kobject_get(&policy->kobj); |
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} |
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read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
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return policy; |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_cpu_get); |
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|
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/** |
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* cpufreq_cpu_put - Decrement kobject usage counter for cpufreq policy. |
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* @policy: cpufreq policy returned by cpufreq_cpu_get(). |
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*/ |
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void cpufreq_cpu_put(struct cpufreq_policy *policy) |
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{ |
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kobject_put(&policy->kobj); |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_cpu_put); |
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|
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/** |
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* cpufreq_cpu_release - Unlock a policy and decrement its usage counter. |
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* @policy: cpufreq policy returned by cpufreq_cpu_acquire(). |
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*/ |
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void cpufreq_cpu_release(struct cpufreq_policy *policy) |
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{ |
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if (WARN_ON(!policy)) |
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return; |
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lockdep_assert_held(&policy->rwsem); |
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up_write(&policy->rwsem); |
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cpufreq_cpu_put(policy); |
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} |
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|
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/** |
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* cpufreq_cpu_acquire - Find policy for a CPU, mark it as busy and lock it. |
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* @cpu: CPU to find the policy for. |
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* |
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* Call cpufreq_cpu_get() to get a reference on the cpufreq policy for @cpu and |
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* if the policy returned by it is not NULL, acquire its rwsem for writing. |
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* Return the policy if it is active or release it and return NULL otherwise. |
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* |
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* The policy returned by this function has to be released with the help of |
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* cpufreq_cpu_release() in order to release its rwsem and balance its usage |
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* counter properly. |
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*/ |
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struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu) |
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{ |
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struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
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|
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if (!policy) |
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return NULL; |
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down_write(&policy->rwsem); |
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if (policy_is_inactive(policy)) { |
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cpufreq_cpu_release(policy); |
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return NULL; |
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} |
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return policy; |
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} |
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|
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/********************************************************************* |
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* EXTERNALLY AFFECTING FREQUENCY CHANGES * |
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*********************************************************************/ |
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|
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/** |
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* adjust_jiffies - Adjust the system "loops_per_jiffy". |
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* @val: CPUFREQ_PRECHANGE or CPUFREQ_POSTCHANGE. |
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* @ci: Frequency change information. |
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* |
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* This function alters the system "loops_per_jiffy" for the clock |
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* speed change. Note that loops_per_jiffy cannot be updated on SMP |
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* systems as each CPU might be scaled differently. So, use the arch |
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* per-CPU loops_per_jiffy value wherever possible. |
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*/ |
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static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci) |
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{ |
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#ifndef CONFIG_SMP |
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static unsigned long l_p_j_ref; |
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static unsigned int l_p_j_ref_freq; |
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|
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if (ci->flags & CPUFREQ_CONST_LOOPS) |
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return; |
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if (!l_p_j_ref_freq) { |
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l_p_j_ref = loops_per_jiffy; |
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l_p_j_ref_freq = ci->old; |
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pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", |
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l_p_j_ref, l_p_j_ref_freq); |
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} |
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if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { |
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loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq, |
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ci->new); |
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pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n", |
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loops_per_jiffy, ci->new); |
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} |
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#endif |
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} |
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|
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/** |
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* cpufreq_notify_transition - Notify frequency transition and adjust jiffies. |
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* @policy: cpufreq policy to enable fast frequency switching for. |
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* @freqs: contain details of the frequency update. |
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* @state: set to CPUFREQ_PRECHANGE or CPUFREQ_POSTCHANGE. |
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* |
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* This function calls the transition notifiers and adjust_jiffies(). |
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* |
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* It is called twice on all CPU frequency changes that have external effects. |
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*/ |
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static void cpufreq_notify_transition(struct cpufreq_policy *policy, |
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struct cpufreq_freqs *freqs, |
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unsigned int state) |
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{ |
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int cpu; |
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|
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BUG_ON(irqs_disabled()); |
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|
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if (cpufreq_disabled()) |
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return; |
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|
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freqs->policy = policy; |
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freqs->flags = cpufreq_driver->flags; |
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pr_debug("notification %u of frequency transition to %u kHz\n", |
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state, freqs->new); |
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|
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switch (state) { |
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case CPUFREQ_PRECHANGE: |
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/* |
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* Detect if the driver reported a value as "old frequency" |
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* which is not equal to what the cpufreq core thinks is |
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* "old frequency". |
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*/ |
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if (policy->cur && policy->cur != freqs->old) { |
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pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n", |
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freqs->old, policy->cur); |
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freqs->old = policy->cur; |
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} |
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|
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srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
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CPUFREQ_PRECHANGE, freqs); |
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|
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adjust_jiffies(CPUFREQ_PRECHANGE, freqs); |
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break; |
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|
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case CPUFREQ_POSTCHANGE: |
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adjust_jiffies(CPUFREQ_POSTCHANGE, freqs); |
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pr_debug("FREQ: %u - CPUs: %*pbl\n", freqs->new, |
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cpumask_pr_args(policy->cpus)); |
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|
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for_each_cpu(cpu, policy->cpus) |
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trace_cpu_frequency(freqs->new, cpu); |
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|
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srcu_notifier_call_chain(&cpufreq_transition_notifier_list, |
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CPUFREQ_POSTCHANGE, freqs); |
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|
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cpufreq_stats_record_transition(policy, freqs->new); |
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policy->cur = freqs->new; |
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} |
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} |
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|
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/* Do post notifications when there are chances that transition has failed */ |
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static void cpufreq_notify_post_transition(struct cpufreq_policy *policy, |
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struct cpufreq_freqs *freqs, int transition_failed) |
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{ |
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cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); |
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if (!transition_failed) |
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return; |
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|
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swap(freqs->old, freqs->new); |
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cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); |
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cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE); |
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} |
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|
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void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
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struct cpufreq_freqs *freqs) |
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{ |
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|
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/* |
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* Catch double invocations of _begin() which lead to self-deadlock. |
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* ASYNC_NOTIFICATION drivers are left out because the cpufreq core |
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* doesn't invoke _begin() on their behalf, and hence the chances of |
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* double invocations are very low. Moreover, there are scenarios |
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* where these checks can emit false-positive warnings in these |
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* drivers; so we avoid that by skipping them altogether. |
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*/ |
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WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) |
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&& current == policy->transition_task); |
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wait: |
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wait_event(policy->transition_wait, !policy->transition_ongoing); |
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|
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spin_lock(&policy->transition_lock); |
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|
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if (unlikely(policy->transition_ongoing)) { |
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spin_unlock(&policy->transition_lock); |
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goto wait; |
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} |
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|
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policy->transition_ongoing = true; |
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policy->transition_task = current; |
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|
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spin_unlock(&policy->transition_lock); |
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|
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cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE); |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin); |
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|
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void cpufreq_freq_transition_end(struct cpufreq_policy *policy, |
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struct cpufreq_freqs *freqs, int transition_failed) |
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{ |
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if (WARN_ON(!policy->transition_ongoing)) |
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return; |
|
|
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cpufreq_notify_post_transition(policy, freqs, transition_failed); |
|
|
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arch_set_freq_scale(policy->related_cpus, |
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policy->cur, |
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policy->cpuinfo.max_freq); |
|
|
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policy->transition_ongoing = false; |
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policy->transition_task = NULL; |
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|
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wake_up(&policy->transition_wait); |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end); |
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|
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/* |
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* Fast frequency switching status count. Positive means "enabled", negative |
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* means "disabled" and 0 means "not decided yet". |
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*/ |
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static int cpufreq_fast_switch_count; |
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static DEFINE_MUTEX(cpufreq_fast_switch_lock); |
|
|
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static void cpufreq_list_transition_notifiers(void) |
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{ |
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struct notifier_block *nb; |
|
|
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pr_info("Registered transition notifiers:\n"); |
|
|
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mutex_lock(&cpufreq_transition_notifier_list.mutex); |
|
|
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for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next) |
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pr_info("%pS\n", nb->notifier_call); |
|
|
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mutex_unlock(&cpufreq_transition_notifier_list.mutex); |
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} |
|
|
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/** |
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* cpufreq_enable_fast_switch - Enable fast frequency switching for policy. |
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* @policy: cpufreq policy to enable fast frequency switching for. |
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* |
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* Try to enable fast frequency switching for @policy. |
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* |
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* The attempt will fail if there is at least one transition notifier registered |
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* at this point, as fast frequency switching is quite fundamentally at odds |
|
* with transition notifiers. Thus if successful, it will make registration of |
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* transition notifiers fail going forward. |
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*/ |
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void cpufreq_enable_fast_switch(struct cpufreq_policy *policy) |
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{ |
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lockdep_assert_held(&policy->rwsem); |
|
|
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if (!policy->fast_switch_possible) |
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return; |
|
|
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mutex_lock(&cpufreq_fast_switch_lock); |
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if (cpufreq_fast_switch_count >= 0) { |
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cpufreq_fast_switch_count++; |
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policy->fast_switch_enabled = true; |
|
} else { |
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pr_warn("CPU%u: Fast frequency switching not enabled\n", |
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policy->cpu); |
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cpufreq_list_transition_notifiers(); |
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} |
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mutex_unlock(&cpufreq_fast_switch_lock); |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_enable_fast_switch); |
|
|
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/** |
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* cpufreq_disable_fast_switch - Disable fast frequency switching for policy. |
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* @policy: cpufreq policy to disable fast frequency switching for. |
|
*/ |
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void cpufreq_disable_fast_switch(struct cpufreq_policy *policy) |
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{ |
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mutex_lock(&cpufreq_fast_switch_lock); |
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if (policy->fast_switch_enabled) { |
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policy->fast_switch_enabled = false; |
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if (!WARN_ON(cpufreq_fast_switch_count <= 0)) |
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cpufreq_fast_switch_count--; |
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} |
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mutex_unlock(&cpufreq_fast_switch_lock); |
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} |
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EXPORT_SYMBOL_GPL(cpufreq_disable_fast_switch); |
|
|
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static unsigned int __resolve_freq(struct cpufreq_policy *policy, |
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unsigned int target_freq, unsigned int relation) |
|
{ |
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unsigned int idx; |
|
|
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target_freq = clamp_val(target_freq, policy->min, policy->max); |
|
|
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if (!policy->freq_table) |
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return target_freq; |
|
|
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idx = cpufreq_frequency_table_target(policy, target_freq, relation); |
|
policy->cached_resolved_idx = idx; |
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policy->cached_target_freq = target_freq; |
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return policy->freq_table[idx].frequency; |
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} |
|
|
|
/** |
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* cpufreq_driver_resolve_freq - Map a target frequency to a driver-supported |
|
* one. |
|
* @policy: associated policy to interrogate |
|
* @target_freq: target frequency to resolve. |
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* |
|
* The target to driver frequency mapping is cached in the policy. |
|
* |
|
* Return: Lowest driver-supported frequency greater than or equal to the |
|
* given target_freq, subject to policy (min/max) and driver limitations. |
|
*/ |
|
unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy, |
|
unsigned int target_freq) |
|
{ |
|
return __resolve_freq(policy, target_freq, CPUFREQ_RELATION_LE); |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_driver_resolve_freq); |
|
|
|
unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy) |
|
{ |
|
unsigned int latency; |
|
|
|
if (policy->transition_delay_us) |
|
return policy->transition_delay_us; |
|
|
|
latency = policy->cpuinfo.transition_latency / NSEC_PER_USEC; |
|
if (latency) { |
|
/* |
|
* For platforms that can change the frequency very fast (< 10 |
|
* us), the above formula gives a decent transition delay. But |
|
* for platforms where transition_latency is in milliseconds, it |
|
* ends up giving unrealistic values. |
|
* |
|
* Cap the default transition delay to 10 ms, which seems to be |
|
* a reasonable amount of time after which we should reevaluate |
|
* the frequency. |
|
*/ |
|
return min(latency * LATENCY_MULTIPLIER, (unsigned int)10000); |
|
} |
|
|
|
return LATENCY_MULTIPLIER; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_policy_transition_delay_us); |
|
|
|
/********************************************************************* |
|
* SYSFS INTERFACE * |
|
*********************************************************************/ |
|
static ssize_t show_boost(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); |
|
} |
|
|
|
static ssize_t store_boost(struct kobject *kobj, struct kobj_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
int ret, enable; |
|
|
|
ret = sscanf(buf, "%d", &enable); |
|
if (ret != 1 || enable < 0 || enable > 1) |
|
return -EINVAL; |
|
|
|
if (cpufreq_boost_trigger_state(enable)) { |
|
pr_err("%s: Cannot %s BOOST!\n", |
|
__func__, enable ? "enable" : "disable"); |
|
return -EINVAL; |
|
} |
|
|
|
pr_debug("%s: cpufreq BOOST %s\n", |
|
__func__, enable ? "enabled" : "disabled"); |
|
|
|
return count; |
|
} |
|
define_one_global_rw(boost); |
|
|
|
static struct cpufreq_governor *find_governor(const char *str_governor) |
|
{ |
|
struct cpufreq_governor *t; |
|
|
|
for_each_governor(t) |
|
if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN)) |
|
return t; |
|
|
|
return NULL; |
|
} |
|
|
|
static struct cpufreq_governor *get_governor(const char *str_governor) |
|
{ |
|
struct cpufreq_governor *t; |
|
|
|
mutex_lock(&cpufreq_governor_mutex); |
|
t = find_governor(str_governor); |
|
if (!t) |
|
goto unlock; |
|
|
|
if (!try_module_get(t->owner)) |
|
t = NULL; |
|
|
|
unlock: |
|
mutex_unlock(&cpufreq_governor_mutex); |
|
|
|
return t; |
|
} |
|
|
|
static unsigned int cpufreq_parse_policy(char *str_governor) |
|
{ |
|
if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) |
|
return CPUFREQ_POLICY_PERFORMANCE; |
|
|
|
if (!strncasecmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) |
|
return CPUFREQ_POLICY_POWERSAVE; |
|
|
|
return CPUFREQ_POLICY_UNKNOWN; |
|
} |
|
|
|
/** |
|
* cpufreq_parse_governor - parse a governor string only for has_target() |
|
* @str_governor: Governor name. |
|
*/ |
|
static struct cpufreq_governor *cpufreq_parse_governor(char *str_governor) |
|
{ |
|
struct cpufreq_governor *t; |
|
|
|
t = get_governor(str_governor); |
|
if (t) |
|
return t; |
|
|
|
if (request_module("cpufreq_%s", str_governor)) |
|
return NULL; |
|
|
|
return get_governor(str_governor); |
|
} |
|
|
|
/* |
|
* cpufreq_per_cpu_attr_read() / show_##file_name() - |
|
* print out cpufreq information |
|
* |
|
* Write out information from cpufreq_driver->policy[cpu]; object must be |
|
* "unsigned int". |
|
*/ |
|
|
|
#define show_one(file_name, object) \ |
|
static ssize_t show_##file_name \ |
|
(struct cpufreq_policy *policy, char *buf) \ |
|
{ \ |
|
return sprintf(buf, "%u\n", policy->object); \ |
|
} |
|
|
|
show_one(cpuinfo_min_freq, cpuinfo.min_freq); |
|
show_one(cpuinfo_max_freq, cpuinfo.max_freq); |
|
show_one(cpuinfo_transition_latency, cpuinfo.transition_latency); |
|
show_one(scaling_min_freq, min); |
|
show_one(scaling_max_freq, max); |
|
|
|
__weak unsigned int arch_freq_get_on_cpu(int cpu) |
|
{ |
|
return 0; |
|
} |
|
|
|
static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf) |
|
{ |
|
ssize_t ret; |
|
unsigned int freq; |
|
|
|
freq = arch_freq_get_on_cpu(policy->cpu); |
|
if (freq) |
|
ret = sprintf(buf, "%u\n", freq); |
|
else if (cpufreq_driver->setpolicy && cpufreq_driver->get) |
|
ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); |
|
else |
|
ret = sprintf(buf, "%u\n", policy->cur); |
|
return ret; |
|
} |
|
|
|
/* |
|
* cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access |
|
*/ |
|
#define store_one(file_name, object) \ |
|
static ssize_t store_##file_name \ |
|
(struct cpufreq_policy *policy, const char *buf, size_t count) \ |
|
{ \ |
|
unsigned long val; \ |
|
int ret; \ |
|
\ |
|
ret = sscanf(buf, "%lu", &val); \ |
|
if (ret != 1) \ |
|
return -EINVAL; \ |
|
\ |
|
ret = freq_qos_update_request(policy->object##_freq_req, val);\ |
|
return ret >= 0 ? count : ret; \ |
|
} |
|
|
|
store_one(scaling_min_freq, min); |
|
store_one(scaling_max_freq, max); |
|
|
|
/* |
|
* show_cpuinfo_cur_freq - current CPU frequency as detected by hardware |
|
*/ |
|
static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, |
|
char *buf) |
|
{ |
|
unsigned int cur_freq = __cpufreq_get(policy); |
|
|
|
if (cur_freq) |
|
return sprintf(buf, "%u\n", cur_freq); |
|
|
|
return sprintf(buf, "<unknown>\n"); |
|
} |
|
|
|
/* |
|
* show_scaling_governor - show the current policy for the specified CPU |
|
*/ |
|
static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf) |
|
{ |
|
if (policy->policy == CPUFREQ_POLICY_POWERSAVE) |
|
return sprintf(buf, "powersave\n"); |
|
else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) |
|
return sprintf(buf, "performance\n"); |
|
else if (policy->governor) |
|
return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", |
|
policy->governor->name); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* store_scaling_governor - store policy for the specified CPU |
|
*/ |
|
static ssize_t store_scaling_governor(struct cpufreq_policy *policy, |
|
const char *buf, size_t count) |
|
{ |
|
char str_governor[16]; |
|
int ret; |
|
|
|
ret = sscanf(buf, "%15s", str_governor); |
|
if (ret != 1) |
|
return -EINVAL; |
|
|
|
if (cpufreq_driver->setpolicy) { |
|
unsigned int new_pol; |
|
|
|
new_pol = cpufreq_parse_policy(str_governor); |
|
if (!new_pol) |
|
return -EINVAL; |
|
|
|
ret = cpufreq_set_policy(policy, NULL, new_pol); |
|
} else { |
|
struct cpufreq_governor *new_gov; |
|
|
|
new_gov = cpufreq_parse_governor(str_governor); |
|
if (!new_gov) |
|
return -EINVAL; |
|
|
|
ret = cpufreq_set_policy(policy, new_gov, |
|
CPUFREQ_POLICY_UNKNOWN); |
|
|
|
module_put(new_gov->owner); |
|
} |
|
|
|
return ret ? ret : count; |
|
} |
|
|
|
/* |
|
* show_scaling_driver - show the cpufreq driver currently loaded |
|
*/ |
|
static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf) |
|
{ |
|
return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); |
|
} |
|
|
|
/* |
|
* show_scaling_available_governors - show the available CPUfreq governors |
|
*/ |
|
static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy, |
|
char *buf) |
|
{ |
|
ssize_t i = 0; |
|
struct cpufreq_governor *t; |
|
|
|
if (!has_target()) { |
|
i += sprintf(buf, "performance powersave"); |
|
goto out; |
|
} |
|
|
|
mutex_lock(&cpufreq_governor_mutex); |
|
for_each_governor(t) { |
|
if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char)) |
|
- (CPUFREQ_NAME_LEN + 2))) |
|
break; |
|
i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); |
|
} |
|
mutex_unlock(&cpufreq_governor_mutex); |
|
out: |
|
i += sprintf(&buf[i], "\n"); |
|
return i; |
|
} |
|
|
|
ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf) |
|
{ |
|
ssize_t i = 0; |
|
unsigned int cpu; |
|
|
|
for_each_cpu(cpu, mask) { |
|
i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u ", cpu); |
|
if (i >= (PAGE_SIZE - 5)) |
|
break; |
|
} |
|
|
|
/* Remove the extra space at the end */ |
|
i--; |
|
|
|
i += sprintf(&buf[i], "\n"); |
|
return i; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_show_cpus); |
|
|
|
/* |
|
* show_related_cpus - show the CPUs affected by each transition even if |
|
* hw coordination is in use |
|
*/ |
|
static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf) |
|
{ |
|
return cpufreq_show_cpus(policy->related_cpus, buf); |
|
} |
|
|
|
/* |
|
* show_affected_cpus - show the CPUs affected by each transition |
|
*/ |
|
static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf) |
|
{ |
|
return cpufreq_show_cpus(policy->cpus, buf); |
|
} |
|
|
|
static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy, |
|
const char *buf, size_t count) |
|
{ |
|
unsigned int freq = 0; |
|
unsigned int ret; |
|
|
|
if (!policy->governor || !policy->governor->store_setspeed) |
|
return -EINVAL; |
|
|
|
ret = sscanf(buf, "%u", &freq); |
|
if (ret != 1) |
|
return -EINVAL; |
|
|
|
policy->governor->store_setspeed(policy, freq); |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf) |
|
{ |
|
if (!policy->governor || !policy->governor->show_setspeed) |
|
return sprintf(buf, "<unsupported>\n"); |
|
|
|
return policy->governor->show_setspeed(policy, buf); |
|
} |
|
|
|
/* |
|
* show_bios_limit - show the current cpufreq HW/BIOS limitation |
|
*/ |
|
static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf) |
|
{ |
|
unsigned int limit; |
|
int ret; |
|
ret = cpufreq_driver->bios_limit(policy->cpu, &limit); |
|
if (!ret) |
|
return sprintf(buf, "%u\n", limit); |
|
return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); |
|
} |
|
|
|
cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400); |
|
cpufreq_freq_attr_ro(cpuinfo_min_freq); |
|
cpufreq_freq_attr_ro(cpuinfo_max_freq); |
|
cpufreq_freq_attr_ro(cpuinfo_transition_latency); |
|
cpufreq_freq_attr_ro(scaling_available_governors); |
|
cpufreq_freq_attr_ro(scaling_driver); |
|
cpufreq_freq_attr_ro(scaling_cur_freq); |
|
cpufreq_freq_attr_ro(bios_limit); |
|
cpufreq_freq_attr_ro(related_cpus); |
|
cpufreq_freq_attr_ro(affected_cpus); |
|
cpufreq_freq_attr_rw(scaling_min_freq); |
|
cpufreq_freq_attr_rw(scaling_max_freq); |
|
cpufreq_freq_attr_rw(scaling_governor); |
|
cpufreq_freq_attr_rw(scaling_setspeed); |
|
|
|
static struct attribute *cpufreq_attrs[] = { |
|
&cpuinfo_min_freq.attr, |
|
&cpuinfo_max_freq.attr, |
|
&cpuinfo_transition_latency.attr, |
|
&scaling_min_freq.attr, |
|
&scaling_max_freq.attr, |
|
&affected_cpus.attr, |
|
&related_cpus.attr, |
|
&scaling_governor.attr, |
|
&scaling_driver.attr, |
|
&scaling_available_governors.attr, |
|
&scaling_setspeed.attr, |
|
NULL |
|
}; |
|
ATTRIBUTE_GROUPS(cpufreq); |
|
|
|
#define to_policy(k) container_of(k, struct cpufreq_policy, kobj) |
|
#define to_attr(a) container_of(a, struct freq_attr, attr) |
|
|
|
static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) |
|
{ |
|
struct cpufreq_policy *policy = to_policy(kobj); |
|
struct freq_attr *fattr = to_attr(attr); |
|
ssize_t ret = -EBUSY; |
|
|
|
if (!fattr->show) |
|
return -EIO; |
|
|
|
down_read(&policy->rwsem); |
|
if (likely(!policy_is_inactive(policy))) |
|
ret = fattr->show(policy, buf); |
|
up_read(&policy->rwsem); |
|
|
|
return ret; |
|
} |
|
|
|
static ssize_t store(struct kobject *kobj, struct attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct cpufreq_policy *policy = to_policy(kobj); |
|
struct freq_attr *fattr = to_attr(attr); |
|
ssize_t ret = -EBUSY; |
|
|
|
if (!fattr->store) |
|
return -EIO; |
|
|
|
down_write(&policy->rwsem); |
|
if (likely(!policy_is_inactive(policy))) |
|
ret = fattr->store(policy, buf, count); |
|
up_write(&policy->rwsem); |
|
|
|
return ret; |
|
} |
|
|
|
static void cpufreq_sysfs_release(struct kobject *kobj) |
|
{ |
|
struct cpufreq_policy *policy = to_policy(kobj); |
|
pr_debug("last reference is dropped\n"); |
|
complete(&policy->kobj_unregister); |
|
} |
|
|
|
static const struct sysfs_ops sysfs_ops = { |
|
.show = show, |
|
.store = store, |
|
}; |
|
|
|
static struct kobj_type ktype_cpufreq = { |
|
.sysfs_ops = &sysfs_ops, |
|
.default_groups = cpufreq_groups, |
|
.release = cpufreq_sysfs_release, |
|
}; |
|
|
|
static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu, |
|
struct device *dev) |
|
{ |
|
if (unlikely(!dev)) |
|
return; |
|
|
|
if (cpumask_test_and_set_cpu(cpu, policy->real_cpus)) |
|
return; |
|
|
|
dev_dbg(dev, "%s: Adding symlink\n", __func__); |
|
if (sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq")) |
|
dev_err(dev, "cpufreq symlink creation failed\n"); |
|
} |
|
|
|
static void remove_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu, |
|
struct device *dev) |
|
{ |
|
dev_dbg(dev, "%s: Removing symlink\n", __func__); |
|
sysfs_remove_link(&dev->kobj, "cpufreq"); |
|
cpumask_clear_cpu(cpu, policy->real_cpus); |
|
} |
|
|
|
static int cpufreq_add_dev_interface(struct cpufreq_policy *policy) |
|
{ |
|
struct freq_attr **drv_attr; |
|
int ret = 0; |
|
|
|
/* set up files for this cpu device */ |
|
drv_attr = cpufreq_driver->attr; |
|
while (drv_attr && *drv_attr) { |
|
ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); |
|
if (ret) |
|
return ret; |
|
drv_attr++; |
|
} |
|
if (cpufreq_driver->get) { |
|
ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); |
|
if (ret) |
|
return ret; |
|
|
|
if (cpufreq_driver->bios_limit) { |
|
ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int cpufreq_init_policy(struct cpufreq_policy *policy) |
|
{ |
|
struct cpufreq_governor *gov = NULL; |
|
unsigned int pol = CPUFREQ_POLICY_UNKNOWN; |
|
int ret; |
|
|
|
if (has_target()) { |
|
/* Update policy governor to the one used before hotplug. */ |
|
gov = get_governor(policy->last_governor); |
|
if (gov) { |
|
pr_debug("Restoring governor %s for cpu %d\n", |
|
gov->name, policy->cpu); |
|
} else { |
|
gov = get_governor(default_governor); |
|
} |
|
|
|
if (!gov) { |
|
gov = cpufreq_default_governor(); |
|
__module_get(gov->owner); |
|
} |
|
|
|
} else { |
|
|
|
/* Use the default policy if there is no last_policy. */ |
|
if (policy->last_policy) { |
|
pol = policy->last_policy; |
|
} else { |
|
pol = cpufreq_parse_policy(default_governor); |
|
/* |
|
* In case the default governor is neither "performance" |
|
* nor "powersave", fall back to the initial policy |
|
* value set by the driver. |
|
*/ |
|
if (pol == CPUFREQ_POLICY_UNKNOWN) |
|
pol = policy->policy; |
|
} |
|
if (pol != CPUFREQ_POLICY_PERFORMANCE && |
|
pol != CPUFREQ_POLICY_POWERSAVE) |
|
return -ENODATA; |
|
} |
|
|
|
ret = cpufreq_set_policy(policy, gov, pol); |
|
if (gov) |
|
module_put(gov->owner); |
|
|
|
return ret; |
|
} |
|
|
|
static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu) |
|
{ |
|
int ret = 0; |
|
|
|
/* Has this CPU been taken care of already? */ |
|
if (cpumask_test_cpu(cpu, policy->cpus)) |
|
return 0; |
|
|
|
down_write(&policy->rwsem); |
|
if (has_target()) |
|
cpufreq_stop_governor(policy); |
|
|
|
cpumask_set_cpu(cpu, policy->cpus); |
|
|
|
if (has_target()) { |
|
ret = cpufreq_start_governor(policy); |
|
if (ret) |
|
pr_err("%s: Failed to start governor\n", __func__); |
|
} |
|
up_write(&policy->rwsem); |
|
return ret; |
|
} |
|
|
|
void refresh_frequency_limits(struct cpufreq_policy *policy) |
|
{ |
|
if (!policy_is_inactive(policy)) { |
|
pr_debug("updating policy for CPU %u\n", policy->cpu); |
|
|
|
cpufreq_set_policy(policy, policy->governor, policy->policy); |
|
} |
|
} |
|
EXPORT_SYMBOL(refresh_frequency_limits); |
|
|
|
static void handle_update(struct work_struct *work) |
|
{ |
|
struct cpufreq_policy *policy = |
|
container_of(work, struct cpufreq_policy, update); |
|
|
|
pr_debug("handle_update for cpu %u called\n", policy->cpu); |
|
down_write(&policy->rwsem); |
|
refresh_frequency_limits(policy); |
|
up_write(&policy->rwsem); |
|
} |
|
|
|
static int cpufreq_notifier_min(struct notifier_block *nb, unsigned long freq, |
|
void *data) |
|
{ |
|
struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_min); |
|
|
|
schedule_work(&policy->update); |
|
return 0; |
|
} |
|
|
|
static int cpufreq_notifier_max(struct notifier_block *nb, unsigned long freq, |
|
void *data) |
|
{ |
|
struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_max); |
|
|
|
schedule_work(&policy->update); |
|
return 0; |
|
} |
|
|
|
static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy) |
|
{ |
|
struct kobject *kobj; |
|
struct completion *cmp; |
|
|
|
down_write(&policy->rwsem); |
|
cpufreq_stats_free_table(policy); |
|
kobj = &policy->kobj; |
|
cmp = &policy->kobj_unregister; |
|
up_write(&policy->rwsem); |
|
kobject_put(kobj); |
|
|
|
/* |
|
* We need to make sure that the underlying kobj is |
|
* actually not referenced anymore by anybody before we |
|
* proceed with unloading. |
|
*/ |
|
pr_debug("waiting for dropping of refcount\n"); |
|
wait_for_completion(cmp); |
|
pr_debug("wait complete\n"); |
|
} |
|
|
|
static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *policy; |
|
struct device *dev = get_cpu_device(cpu); |
|
int ret; |
|
|
|
if (!dev) |
|
return NULL; |
|
|
|
policy = kzalloc(sizeof(*policy), GFP_KERNEL); |
|
if (!policy) |
|
return NULL; |
|
|
|
if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL)) |
|
goto err_free_policy; |
|
|
|
if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL)) |
|
goto err_free_cpumask; |
|
|
|
if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL)) |
|
goto err_free_rcpumask; |
|
|
|
ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, |
|
cpufreq_global_kobject, "policy%u", cpu); |
|
if (ret) { |
|
dev_err(dev, "%s: failed to init policy->kobj: %d\n", __func__, ret); |
|
/* |
|
* The entire policy object will be freed below, but the extra |
|
* memory allocated for the kobject name needs to be freed by |
|
* releasing the kobject. |
|
*/ |
|
kobject_put(&policy->kobj); |
|
goto err_free_real_cpus; |
|
} |
|
|
|
freq_constraints_init(&policy->constraints); |
|
|
|
policy->nb_min.notifier_call = cpufreq_notifier_min; |
|
policy->nb_max.notifier_call = cpufreq_notifier_max; |
|
|
|
ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MIN, |
|
&policy->nb_min); |
|
if (ret) { |
|
dev_err(dev, "Failed to register MIN QoS notifier: %d (%*pbl)\n", |
|
ret, cpumask_pr_args(policy->cpus)); |
|
goto err_kobj_remove; |
|
} |
|
|
|
ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MAX, |
|
&policy->nb_max); |
|
if (ret) { |
|
dev_err(dev, "Failed to register MAX QoS notifier: %d (%*pbl)\n", |
|
ret, cpumask_pr_args(policy->cpus)); |
|
goto err_min_qos_notifier; |
|
} |
|
|
|
INIT_LIST_HEAD(&policy->policy_list); |
|
init_rwsem(&policy->rwsem); |
|
spin_lock_init(&policy->transition_lock); |
|
init_waitqueue_head(&policy->transition_wait); |
|
init_completion(&policy->kobj_unregister); |
|
INIT_WORK(&policy->update, handle_update); |
|
|
|
policy->cpu = cpu; |
|
return policy; |
|
|
|
err_min_qos_notifier: |
|
freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, |
|
&policy->nb_min); |
|
err_kobj_remove: |
|
cpufreq_policy_put_kobj(policy); |
|
err_free_real_cpus: |
|
free_cpumask_var(policy->real_cpus); |
|
err_free_rcpumask: |
|
free_cpumask_var(policy->related_cpus); |
|
err_free_cpumask: |
|
free_cpumask_var(policy->cpus); |
|
err_free_policy: |
|
kfree(policy); |
|
|
|
return NULL; |
|
} |
|
|
|
static void cpufreq_policy_free(struct cpufreq_policy *policy) |
|
{ |
|
unsigned long flags; |
|
int cpu; |
|
|
|
/* |
|
* The callers must ensure the policy is inactive by now, to avoid any |
|
* races with show()/store() callbacks. |
|
*/ |
|
if (unlikely(!policy_is_inactive(policy))) |
|
pr_warn("%s: Freeing active policy\n", __func__); |
|
|
|
/* Remove policy from list */ |
|
write_lock_irqsave(&cpufreq_driver_lock, flags); |
|
list_del(&policy->policy_list); |
|
|
|
for_each_cpu(cpu, policy->related_cpus) |
|
per_cpu(cpufreq_cpu_data, cpu) = NULL; |
|
write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
|
|
freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MAX, |
|
&policy->nb_max); |
|
freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, |
|
&policy->nb_min); |
|
|
|
/* Cancel any pending policy->update work before freeing the policy. */ |
|
cancel_work_sync(&policy->update); |
|
|
|
if (policy->max_freq_req) { |
|
/* |
|
* Remove max_freq_req after sending CPUFREQ_REMOVE_POLICY |
|
* notification, since CPUFREQ_CREATE_POLICY notification was |
|
* sent after adding max_freq_req earlier. |
|
*/ |
|
blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
|
CPUFREQ_REMOVE_POLICY, policy); |
|
freq_qos_remove_request(policy->max_freq_req); |
|
} |
|
|
|
freq_qos_remove_request(policy->min_freq_req); |
|
kfree(policy->min_freq_req); |
|
|
|
cpufreq_policy_put_kobj(policy); |
|
free_cpumask_var(policy->real_cpus); |
|
free_cpumask_var(policy->related_cpus); |
|
free_cpumask_var(policy->cpus); |
|
kfree(policy); |
|
} |
|
|
|
static int cpufreq_online(unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *policy; |
|
bool new_policy; |
|
unsigned long flags; |
|
unsigned int j; |
|
int ret; |
|
|
|
pr_debug("%s: bringing CPU%u online\n", __func__, cpu); |
|
|
|
/* Check if this CPU already has a policy to manage it */ |
|
policy = per_cpu(cpufreq_cpu_data, cpu); |
|
if (policy) { |
|
WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); |
|
if (!policy_is_inactive(policy)) |
|
return cpufreq_add_policy_cpu(policy, cpu); |
|
|
|
/* This is the only online CPU for the policy. Start over. */ |
|
new_policy = false; |
|
down_write(&policy->rwsem); |
|
policy->cpu = cpu; |
|
policy->governor = NULL; |
|
} else { |
|
new_policy = true; |
|
policy = cpufreq_policy_alloc(cpu); |
|
if (!policy) |
|
return -ENOMEM; |
|
down_write(&policy->rwsem); |
|
} |
|
|
|
if (!new_policy && cpufreq_driver->online) { |
|
/* Recover policy->cpus using related_cpus */ |
|
cpumask_copy(policy->cpus, policy->related_cpus); |
|
|
|
ret = cpufreq_driver->online(policy); |
|
if (ret) { |
|
pr_debug("%s: %d: initialization failed\n", __func__, |
|
__LINE__); |
|
goto out_exit_policy; |
|
} |
|
} else { |
|
cpumask_copy(policy->cpus, cpumask_of(cpu)); |
|
|
|
/* |
|
* Call driver. From then on the cpufreq must be able |
|
* to accept all calls to ->verify and ->setpolicy for this CPU. |
|
*/ |
|
ret = cpufreq_driver->init(policy); |
|
if (ret) { |
|
pr_debug("%s: %d: initialization failed\n", __func__, |
|
__LINE__); |
|
goto out_free_policy; |
|
} |
|
|
|
/* |
|
* The initialization has succeeded and the policy is online. |
|
* If there is a problem with its frequency table, take it |
|
* offline and drop it. |
|
*/ |
|
ret = cpufreq_table_validate_and_sort(policy); |
|
if (ret) |
|
goto out_offline_policy; |
|
|
|
/* related_cpus should at least include policy->cpus. */ |
|
cpumask_copy(policy->related_cpus, policy->cpus); |
|
} |
|
|
|
/* |
|
* affected cpus must always be the one, which are online. We aren't |
|
* managing offline cpus here. |
|
*/ |
|
cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); |
|
|
|
if (new_policy) { |
|
for_each_cpu(j, policy->related_cpus) { |
|
per_cpu(cpufreq_cpu_data, j) = policy; |
|
add_cpu_dev_symlink(policy, j, get_cpu_device(j)); |
|
} |
|
|
|
policy->min_freq_req = kzalloc(2 * sizeof(*policy->min_freq_req), |
|
GFP_KERNEL); |
|
if (!policy->min_freq_req) { |
|
ret = -ENOMEM; |
|
goto out_destroy_policy; |
|
} |
|
|
|
ret = freq_qos_add_request(&policy->constraints, |
|
policy->min_freq_req, FREQ_QOS_MIN, |
|
FREQ_QOS_MIN_DEFAULT_VALUE); |
|
if (ret < 0) { |
|
/* |
|
* So we don't call freq_qos_remove_request() for an |
|
* uninitialized request. |
|
*/ |
|
kfree(policy->min_freq_req); |
|
policy->min_freq_req = NULL; |
|
goto out_destroy_policy; |
|
} |
|
|
|
/* |
|
* This must be initialized right here to avoid calling |
|
* freq_qos_remove_request() on uninitialized request in case |
|
* of errors. |
|
*/ |
|
policy->max_freq_req = policy->min_freq_req + 1; |
|
|
|
ret = freq_qos_add_request(&policy->constraints, |
|
policy->max_freq_req, FREQ_QOS_MAX, |
|
FREQ_QOS_MAX_DEFAULT_VALUE); |
|
if (ret < 0) { |
|
policy->max_freq_req = NULL; |
|
goto out_destroy_policy; |
|
} |
|
|
|
blocking_notifier_call_chain(&cpufreq_policy_notifier_list, |
|
CPUFREQ_CREATE_POLICY, policy); |
|
} |
|
|
|
if (cpufreq_driver->get && has_target()) { |
|
policy->cur = cpufreq_driver->get(policy->cpu); |
|
if (!policy->cur) { |
|
ret = -EIO; |
|
pr_err("%s: ->get() failed\n", __func__); |
|
goto out_destroy_policy; |
|
} |
|
} |
|
|
|
/* |
|
* Sometimes boot loaders set CPU frequency to a value outside of |
|
* frequency table present with cpufreq core. In such cases CPU might be |
|
* unstable if it has to run on that frequency for long duration of time |
|
* and so its better to set it to a frequency which is specified in |
|
* freq-table. This also makes cpufreq stats inconsistent as |
|
* cpufreq-stats would fail to register because current frequency of CPU |
|
* isn't found in freq-table. |
|
* |
|
* Because we don't want this change to effect boot process badly, we go |
|
* for the next freq which is >= policy->cur ('cur' must be set by now, |
|
* otherwise we will end up setting freq to lowest of the table as 'cur' |
|
* is initialized to zero). |
|
* |
|
* We are passing target-freq as "policy->cur - 1" otherwise |
|
* __cpufreq_driver_target() would simply fail, as policy->cur will be |
|
* equal to target-freq. |
|
*/ |
|
if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) |
|
&& has_target()) { |
|
unsigned int old_freq = policy->cur; |
|
|
|
/* Are we running at unknown frequency ? */ |
|
ret = cpufreq_frequency_table_get_index(policy, old_freq); |
|
if (ret == -EINVAL) { |
|
ret = __cpufreq_driver_target(policy, old_freq - 1, |
|
CPUFREQ_RELATION_L); |
|
|
|
/* |
|
* Reaching here after boot in a few seconds may not |
|
* mean that system will remain stable at "unknown" |
|
* frequency for longer duration. Hence, a BUG_ON(). |
|
*/ |
|
BUG_ON(ret); |
|
pr_info("%s: CPU%d: Running at unlisted initial frequency: %u KHz, changing to: %u KHz\n", |
|
__func__, policy->cpu, old_freq, policy->cur); |
|
} |
|
} |
|
|
|
if (new_policy) { |
|
ret = cpufreq_add_dev_interface(policy); |
|
if (ret) |
|
goto out_destroy_policy; |
|
|
|
cpufreq_stats_create_table(policy); |
|
|
|
write_lock_irqsave(&cpufreq_driver_lock, flags); |
|
list_add(&policy->policy_list, &cpufreq_policy_list); |
|
write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
|
|
/* |
|
* Register with the energy model before |
|
* sched_cpufreq_governor_change() is called, which will result |
|
* in rebuilding of the sched domains, which should only be done |
|
* once the energy model is properly initialized for the policy |
|
* first. |
|
* |
|
* Also, this should be called before the policy is registered |
|
* with cooling framework. |
|
*/ |
|
if (cpufreq_driver->register_em) |
|
cpufreq_driver->register_em(policy); |
|
} |
|
|
|
ret = cpufreq_init_policy(policy); |
|
if (ret) { |
|
pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n", |
|
__func__, cpu, ret); |
|
goto out_destroy_policy; |
|
} |
|
|
|
up_write(&policy->rwsem); |
|
|
|
kobject_uevent(&policy->kobj, KOBJ_ADD); |
|
|
|
/* Callback for handling stuff after policy is ready */ |
|
if (cpufreq_driver->ready) |
|
cpufreq_driver->ready(policy); |
|
|
|
if (cpufreq_thermal_control_enabled(cpufreq_driver)) |
|
policy->cdev = of_cpufreq_cooling_register(policy); |
|
|
|
pr_debug("initialization complete\n"); |
|
|
|
return 0; |
|
|
|
out_destroy_policy: |
|
for_each_cpu(j, policy->real_cpus) |
|
remove_cpu_dev_symlink(policy, j, get_cpu_device(j)); |
|
|
|
out_offline_policy: |
|
if (cpufreq_driver->offline) |
|
cpufreq_driver->offline(policy); |
|
|
|
out_exit_policy: |
|
if (cpufreq_driver->exit) |
|
cpufreq_driver->exit(policy); |
|
|
|
out_free_policy: |
|
cpumask_clear(policy->cpus); |
|
up_write(&policy->rwsem); |
|
|
|
cpufreq_policy_free(policy); |
|
return ret; |
|
} |
|
|
|
/** |
|
* cpufreq_add_dev - the cpufreq interface for a CPU device. |
|
* @dev: CPU device. |
|
* @sif: Subsystem interface structure pointer (not used) |
|
*/ |
|
static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) |
|
{ |
|
struct cpufreq_policy *policy; |
|
unsigned cpu = dev->id; |
|
int ret; |
|
|
|
dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu); |
|
|
|
if (cpu_online(cpu)) { |
|
ret = cpufreq_online(cpu); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
/* Create sysfs link on CPU registration */ |
|
policy = per_cpu(cpufreq_cpu_data, cpu); |
|
if (policy) |
|
add_cpu_dev_symlink(policy, cpu, dev); |
|
|
|
return 0; |
|
} |
|
|
|
static void __cpufreq_offline(unsigned int cpu, struct cpufreq_policy *policy) |
|
{ |
|
int ret; |
|
|
|
if (has_target()) |
|
cpufreq_stop_governor(policy); |
|
|
|
cpumask_clear_cpu(cpu, policy->cpus); |
|
|
|
if (!policy_is_inactive(policy)) { |
|
/* Nominate a new CPU if necessary. */ |
|
if (cpu == policy->cpu) |
|
policy->cpu = cpumask_any(policy->cpus); |
|
|
|
/* Start the governor again for the active policy. */ |
|
if (has_target()) { |
|
ret = cpufreq_start_governor(policy); |
|
if (ret) |
|
pr_err("%s: Failed to start governor\n", __func__); |
|
} |
|
|
|
return; |
|
} |
|
|
|
if (has_target()) |
|
strncpy(policy->last_governor, policy->governor->name, |
|
CPUFREQ_NAME_LEN); |
|
else |
|
policy->last_policy = policy->policy; |
|
|
|
if (cpufreq_thermal_control_enabled(cpufreq_driver)) { |
|
cpufreq_cooling_unregister(policy->cdev); |
|
policy->cdev = NULL; |
|
} |
|
|
|
if (has_target()) |
|
cpufreq_exit_governor(policy); |
|
|
|
/* |
|
* Perform the ->offline() during light-weight tear-down, as |
|
* that allows fast recovery when the CPU comes back. |
|
*/ |
|
if (cpufreq_driver->offline) { |
|
cpufreq_driver->offline(policy); |
|
} else if (cpufreq_driver->exit) { |
|
cpufreq_driver->exit(policy); |
|
policy->freq_table = NULL; |
|
} |
|
} |
|
|
|
static int cpufreq_offline(unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *policy; |
|
|
|
pr_debug("%s: unregistering CPU %u\n", __func__, cpu); |
|
|
|
policy = cpufreq_cpu_get_raw(cpu); |
|
if (!policy) { |
|
pr_debug("%s: No cpu_data found\n", __func__); |
|
return 0; |
|
} |
|
|
|
down_write(&policy->rwsem); |
|
|
|
__cpufreq_offline(cpu, policy); |
|
|
|
up_write(&policy->rwsem); |
|
return 0; |
|
} |
|
|
|
/* |
|
* cpufreq_remove_dev - remove a CPU device |
|
* |
|
* Removes the cpufreq interface for a CPU device. |
|
*/ |
|
static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) |
|
{ |
|
unsigned int cpu = dev->id; |
|
struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); |
|
|
|
if (!policy) |
|
return; |
|
|
|
down_write(&policy->rwsem); |
|
|
|
if (cpu_online(cpu)) |
|
__cpufreq_offline(cpu, policy); |
|
|
|
remove_cpu_dev_symlink(policy, cpu, dev); |
|
|
|
if (!cpumask_empty(policy->real_cpus)) { |
|
up_write(&policy->rwsem); |
|
return; |
|
} |
|
|
|
/* We did light-weight exit earlier, do full tear down now */ |
|
if (cpufreq_driver->offline) |
|
cpufreq_driver->exit(policy); |
|
|
|
up_write(&policy->rwsem); |
|
|
|
cpufreq_policy_free(policy); |
|
} |
|
|
|
/** |
|
* cpufreq_out_of_sync - Fix up actual and saved CPU frequency difference. |
|
* @policy: Policy managing CPUs. |
|
* @new_freq: New CPU frequency. |
|
* |
|
* Adjust to the current frequency first and clean up later by either calling |
|
* cpufreq_update_policy(), or scheduling handle_update(). |
|
*/ |
|
static void cpufreq_out_of_sync(struct cpufreq_policy *policy, |
|
unsigned int new_freq) |
|
{ |
|
struct cpufreq_freqs freqs; |
|
|
|
pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n", |
|
policy->cur, new_freq); |
|
|
|
freqs.old = policy->cur; |
|
freqs.new = new_freq; |
|
|
|
cpufreq_freq_transition_begin(policy, &freqs); |
|
cpufreq_freq_transition_end(policy, &freqs, 0); |
|
} |
|
|
|
static unsigned int cpufreq_verify_current_freq(struct cpufreq_policy *policy, bool update) |
|
{ |
|
unsigned int new_freq; |
|
|
|
new_freq = cpufreq_driver->get(policy->cpu); |
|
if (!new_freq) |
|
return 0; |
|
|
|
/* |
|
* If fast frequency switching is used with the given policy, the check |
|
* against policy->cur is pointless, so skip it in that case. |
|
*/ |
|
if (policy->fast_switch_enabled || !has_target()) |
|
return new_freq; |
|
|
|
if (policy->cur != new_freq) { |
|
/* |
|
* For some platforms, the frequency returned by hardware may be |
|
* slightly different from what is provided in the frequency |
|
* table, for example hardware may return 499 MHz instead of 500 |
|
* MHz. In such cases it is better to avoid getting into |
|
* unnecessary frequency updates. |
|
*/ |
|
if (abs(policy->cur - new_freq) < HZ_PER_MHZ) |
|
return policy->cur; |
|
|
|
cpufreq_out_of_sync(policy, new_freq); |
|
if (update) |
|
schedule_work(&policy->update); |
|
} |
|
|
|
return new_freq; |
|
} |
|
|
|
/** |
|
* cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur |
|
* @cpu: CPU number |
|
* |
|
* This is the last known freq, without actually getting it from the driver. |
|
* Return value will be same as what is shown in scaling_cur_freq in sysfs. |
|
*/ |
|
unsigned int cpufreq_quick_get(unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *policy; |
|
unsigned int ret_freq = 0; |
|
unsigned long flags; |
|
|
|
read_lock_irqsave(&cpufreq_driver_lock, flags); |
|
|
|
if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) { |
|
ret_freq = cpufreq_driver->get(cpu); |
|
read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
return ret_freq; |
|
} |
|
|
|
read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
|
|
policy = cpufreq_cpu_get(cpu); |
|
if (policy) { |
|
ret_freq = policy->cur; |
|
cpufreq_cpu_put(policy); |
|
} |
|
|
|
return ret_freq; |
|
} |
|
EXPORT_SYMBOL(cpufreq_quick_get); |
|
|
|
/** |
|
* cpufreq_quick_get_max - get the max reported CPU frequency for this CPU |
|
* @cpu: CPU number |
|
* |
|
* Just return the max possible frequency for a given CPU. |
|
*/ |
|
unsigned int cpufreq_quick_get_max(unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
|
unsigned int ret_freq = 0; |
|
|
|
if (policy) { |
|
ret_freq = policy->max; |
|
cpufreq_cpu_put(policy); |
|
} |
|
|
|
return ret_freq; |
|
} |
|
EXPORT_SYMBOL(cpufreq_quick_get_max); |
|
|
|
/** |
|
* cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU |
|
* @cpu: CPU number |
|
* |
|
* The default return value is the max_freq field of cpuinfo. |
|
*/ |
|
__weak unsigned int cpufreq_get_hw_max_freq(unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
|
unsigned int ret_freq = 0; |
|
|
|
if (policy) { |
|
ret_freq = policy->cpuinfo.max_freq; |
|
cpufreq_cpu_put(policy); |
|
} |
|
|
|
return ret_freq; |
|
} |
|
EXPORT_SYMBOL(cpufreq_get_hw_max_freq); |
|
|
|
static unsigned int __cpufreq_get(struct cpufreq_policy *policy) |
|
{ |
|
if (unlikely(policy_is_inactive(policy))) |
|
return 0; |
|
|
|
return cpufreq_verify_current_freq(policy, true); |
|
} |
|
|
|
/** |
|
* cpufreq_get - get the current CPU frequency (in kHz) |
|
* @cpu: CPU number |
|
* |
|
* Get the CPU current (static) CPU frequency |
|
*/ |
|
unsigned int cpufreq_get(unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); |
|
unsigned int ret_freq = 0; |
|
|
|
if (policy) { |
|
down_read(&policy->rwsem); |
|
if (cpufreq_driver->get) |
|
ret_freq = __cpufreq_get(policy); |
|
up_read(&policy->rwsem); |
|
|
|
cpufreq_cpu_put(policy); |
|
} |
|
|
|
return ret_freq; |
|
} |
|
EXPORT_SYMBOL(cpufreq_get); |
|
|
|
static struct subsys_interface cpufreq_interface = { |
|
.name = "cpufreq", |
|
.subsys = &cpu_subsys, |
|
.add_dev = cpufreq_add_dev, |
|
.remove_dev = cpufreq_remove_dev, |
|
}; |
|
|
|
/* |
|
* In case platform wants some specific frequency to be configured |
|
* during suspend.. |
|
*/ |
|
int cpufreq_generic_suspend(struct cpufreq_policy *policy) |
|
{ |
|
int ret; |
|
|
|
if (!policy->suspend_freq) { |
|
pr_debug("%s: suspend_freq not defined\n", __func__); |
|
return 0; |
|
} |
|
|
|
pr_debug("%s: Setting suspend-freq: %u\n", __func__, |
|
policy->suspend_freq); |
|
|
|
ret = __cpufreq_driver_target(policy, policy->suspend_freq, |
|
CPUFREQ_RELATION_H); |
|
if (ret) |
|
pr_err("%s: unable to set suspend-freq: %u. err: %d\n", |
|
__func__, policy->suspend_freq, ret); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(cpufreq_generic_suspend); |
|
|
|
/** |
|
* cpufreq_suspend() - Suspend CPUFreq governors. |
|
* |
|
* Called during system wide Suspend/Hibernate cycles for suspending governors |
|
* as some platforms can't change frequency after this point in suspend cycle. |
|
* Because some of the devices (like: i2c, regulators, etc) they use for |
|
* changing frequency are suspended quickly after this point. |
|
*/ |
|
void cpufreq_suspend(void) |
|
{ |
|
struct cpufreq_policy *policy; |
|
|
|
if (!cpufreq_driver) |
|
return; |
|
|
|
if (!has_target() && !cpufreq_driver->suspend) |
|
goto suspend; |
|
|
|
pr_debug("%s: Suspending Governors\n", __func__); |
|
|
|
for_each_active_policy(policy) { |
|
if (has_target()) { |
|
down_write(&policy->rwsem); |
|
cpufreq_stop_governor(policy); |
|
up_write(&policy->rwsem); |
|
} |
|
|
|
if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy)) |
|
pr_err("%s: Failed to suspend driver: %s\n", __func__, |
|
cpufreq_driver->name); |
|
} |
|
|
|
suspend: |
|
cpufreq_suspended = true; |
|
} |
|
|
|
/** |
|
* cpufreq_resume() - Resume CPUFreq governors. |
|
* |
|
* Called during system wide Suspend/Hibernate cycle for resuming governors that |
|
* are suspended with cpufreq_suspend(). |
|
*/ |
|
void cpufreq_resume(void) |
|
{ |
|
struct cpufreq_policy *policy; |
|
int ret; |
|
|
|
if (!cpufreq_driver) |
|
return; |
|
|
|
if (unlikely(!cpufreq_suspended)) |
|
return; |
|
|
|
cpufreq_suspended = false; |
|
|
|
if (!has_target() && !cpufreq_driver->resume) |
|
return; |
|
|
|
pr_debug("%s: Resuming Governors\n", __func__); |
|
|
|
for_each_active_policy(policy) { |
|
if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) { |
|
pr_err("%s: Failed to resume driver: %p\n", __func__, |
|
policy); |
|
} else if (has_target()) { |
|
down_write(&policy->rwsem); |
|
ret = cpufreq_start_governor(policy); |
|
up_write(&policy->rwsem); |
|
|
|
if (ret) |
|
pr_err("%s: Failed to start governor for policy: %p\n", |
|
__func__, policy); |
|
} |
|
} |
|
} |
|
|
|
/** |
|
* cpufreq_driver_test_flags - Test cpufreq driver's flags against given ones. |
|
* @flags: Flags to test against the current cpufreq driver's flags. |
|
* |
|
* Assumes that the driver is there, so callers must ensure that this is the |
|
* case. |
|
*/ |
|
bool cpufreq_driver_test_flags(u16 flags) |
|
{ |
|
return !!(cpufreq_driver->flags & flags); |
|
} |
|
|
|
/** |
|
* cpufreq_get_current_driver - Return the current driver's name. |
|
* |
|
* Return the name string of the currently registered cpufreq driver or NULL if |
|
* none. |
|
*/ |
|
const char *cpufreq_get_current_driver(void) |
|
{ |
|
if (cpufreq_driver) |
|
return cpufreq_driver->name; |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_get_current_driver); |
|
|
|
/** |
|
* cpufreq_get_driver_data - Return current driver data. |
|
* |
|
* Return the private data of the currently registered cpufreq driver, or NULL |
|
* if no cpufreq driver has been registered. |
|
*/ |
|
void *cpufreq_get_driver_data(void) |
|
{ |
|
if (cpufreq_driver) |
|
return cpufreq_driver->driver_data; |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_get_driver_data); |
|
|
|
/********************************************************************* |
|
* NOTIFIER LISTS INTERFACE * |
|
*********************************************************************/ |
|
|
|
/** |
|
* cpufreq_register_notifier - Register a notifier with cpufreq. |
|
* @nb: notifier function to register. |
|
* @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER. |
|
* |
|
* Add a notifier to one of two lists: either a list of notifiers that run on |
|
* clock rate changes (once before and once after every transition), or a list |
|
* of notifiers that ron on cpufreq policy changes. |
|
* |
|
* This function may sleep and it has the same return values as |
|
* blocking_notifier_chain_register(). |
|
*/ |
|
int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) |
|
{ |
|
int ret; |
|
|
|
if (cpufreq_disabled()) |
|
return -EINVAL; |
|
|
|
switch (list) { |
|
case CPUFREQ_TRANSITION_NOTIFIER: |
|
mutex_lock(&cpufreq_fast_switch_lock); |
|
|
|
if (cpufreq_fast_switch_count > 0) { |
|
mutex_unlock(&cpufreq_fast_switch_lock); |
|
return -EBUSY; |
|
} |
|
ret = srcu_notifier_chain_register( |
|
&cpufreq_transition_notifier_list, nb); |
|
if (!ret) |
|
cpufreq_fast_switch_count--; |
|
|
|
mutex_unlock(&cpufreq_fast_switch_lock); |
|
break; |
|
case CPUFREQ_POLICY_NOTIFIER: |
|
ret = blocking_notifier_chain_register( |
|
&cpufreq_policy_notifier_list, nb); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
} |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(cpufreq_register_notifier); |
|
|
|
/** |
|
* cpufreq_unregister_notifier - Unregister a notifier from cpufreq. |
|
* @nb: notifier block to be unregistered. |
|
* @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER. |
|
* |
|
* Remove a notifier from one of the cpufreq notifier lists. |
|
* |
|
* This function may sleep and it has the same return values as |
|
* blocking_notifier_chain_unregister(). |
|
*/ |
|
int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list) |
|
{ |
|
int ret; |
|
|
|
if (cpufreq_disabled()) |
|
return -EINVAL; |
|
|
|
switch (list) { |
|
case CPUFREQ_TRANSITION_NOTIFIER: |
|
mutex_lock(&cpufreq_fast_switch_lock); |
|
|
|
ret = srcu_notifier_chain_unregister( |
|
&cpufreq_transition_notifier_list, nb); |
|
if (!ret && !WARN_ON(cpufreq_fast_switch_count >= 0)) |
|
cpufreq_fast_switch_count++; |
|
|
|
mutex_unlock(&cpufreq_fast_switch_lock); |
|
break; |
|
case CPUFREQ_POLICY_NOTIFIER: |
|
ret = blocking_notifier_chain_unregister( |
|
&cpufreq_policy_notifier_list, nb); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
} |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(cpufreq_unregister_notifier); |
|
|
|
|
|
/********************************************************************* |
|
* GOVERNORS * |
|
*********************************************************************/ |
|
|
|
/** |
|
* cpufreq_driver_fast_switch - Carry out a fast CPU frequency switch. |
|
* @policy: cpufreq policy to switch the frequency for. |
|
* @target_freq: New frequency to set (may be approximate). |
|
* |
|
* Carry out a fast frequency switch without sleeping. |
|
* |
|
* The driver's ->fast_switch() callback invoked by this function must be |
|
* suitable for being called from within RCU-sched read-side critical sections |
|
* and it is expected to select the minimum available frequency greater than or |
|
* equal to @target_freq (CPUFREQ_RELATION_L). |
|
* |
|
* This function must not be called if policy->fast_switch_enabled is unset. |
|
* |
|
* Governors calling this function must guarantee that it will never be invoked |
|
* twice in parallel for the same policy and that it will never be called in |
|
* parallel with either ->target() or ->target_index() for the same policy. |
|
* |
|
* Returns the actual frequency set for the CPU. |
|
* |
|
* If 0 is returned by the driver's ->fast_switch() callback to indicate an |
|
* error condition, the hardware configuration must be preserved. |
|
*/ |
|
unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, |
|
unsigned int target_freq) |
|
{ |
|
unsigned int freq; |
|
int cpu; |
|
|
|
target_freq = clamp_val(target_freq, policy->min, policy->max); |
|
freq = cpufreq_driver->fast_switch(policy, target_freq); |
|
|
|
if (!freq) |
|
return 0; |
|
|
|
policy->cur = freq; |
|
arch_set_freq_scale(policy->related_cpus, freq, |
|
policy->cpuinfo.max_freq); |
|
cpufreq_stats_record_transition(policy, freq); |
|
|
|
if (trace_cpu_frequency_enabled()) { |
|
for_each_cpu(cpu, policy->cpus) |
|
trace_cpu_frequency(freq, cpu); |
|
} |
|
|
|
return freq; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch); |
|
|
|
/** |
|
* cpufreq_driver_adjust_perf - Adjust CPU performance level in one go. |
|
* @cpu: Target CPU. |
|
* @min_perf: Minimum (required) performance level (units of @capacity). |
|
* @target_perf: Target (desired) performance level (units of @capacity). |
|
* @capacity: Capacity of the target CPU. |
|
* |
|
* Carry out a fast performance level switch of @cpu without sleeping. |
|
* |
|
* The driver's ->adjust_perf() callback invoked by this function must be |
|
* suitable for being called from within RCU-sched read-side critical sections |
|
* and it is expected to select a suitable performance level equal to or above |
|
* @min_perf and preferably equal to or below @target_perf. |
|
* |
|
* This function must not be called if policy->fast_switch_enabled is unset. |
|
* |
|
* Governors calling this function must guarantee that it will never be invoked |
|
* twice in parallel for the same CPU and that it will never be called in |
|
* parallel with either ->target() or ->target_index() or ->fast_switch() for |
|
* the same CPU. |
|
*/ |
|
void cpufreq_driver_adjust_perf(unsigned int cpu, |
|
unsigned long min_perf, |
|
unsigned long target_perf, |
|
unsigned long capacity) |
|
{ |
|
cpufreq_driver->adjust_perf(cpu, min_perf, target_perf, capacity); |
|
} |
|
|
|
/** |
|
* cpufreq_driver_has_adjust_perf - Check "direct fast switch" callback. |
|
* |
|
* Return 'true' if the ->adjust_perf callback is present for the |
|
* current driver or 'false' otherwise. |
|
*/ |
|
bool cpufreq_driver_has_adjust_perf(void) |
|
{ |
|
return !!cpufreq_driver->adjust_perf; |
|
} |
|
|
|
/* Must set freqs->new to intermediate frequency */ |
|
static int __target_intermediate(struct cpufreq_policy *policy, |
|
struct cpufreq_freqs *freqs, int index) |
|
{ |
|
int ret; |
|
|
|
freqs->new = cpufreq_driver->get_intermediate(policy, index); |
|
|
|
/* We don't need to switch to intermediate freq */ |
|
if (!freqs->new) |
|
return 0; |
|
|
|
pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", |
|
__func__, policy->cpu, freqs->old, freqs->new); |
|
|
|
cpufreq_freq_transition_begin(policy, freqs); |
|
ret = cpufreq_driver->target_intermediate(policy, index); |
|
cpufreq_freq_transition_end(policy, freqs, ret); |
|
|
|
if (ret) |
|
pr_err("%s: Failed to change to intermediate frequency: %d\n", |
|
__func__, ret); |
|
|
|
return ret; |
|
} |
|
|
|
static int __target_index(struct cpufreq_policy *policy, int index) |
|
{ |
|
struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; |
|
unsigned int restore_freq, intermediate_freq = 0; |
|
unsigned int newfreq = policy->freq_table[index].frequency; |
|
int retval = -EINVAL; |
|
bool notify; |
|
|
|
if (newfreq == policy->cur) |
|
return 0; |
|
|
|
/* Save last value to restore later on errors */ |
|
restore_freq = policy->cur; |
|
|
|
notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); |
|
if (notify) { |
|
/* Handle switching to intermediate frequency */ |
|
if (cpufreq_driver->get_intermediate) { |
|
retval = __target_intermediate(policy, &freqs, index); |
|
if (retval) |
|
return retval; |
|
|
|
intermediate_freq = freqs.new; |
|
/* Set old freq to intermediate */ |
|
if (intermediate_freq) |
|
freqs.old = freqs.new; |
|
} |
|
|
|
freqs.new = newfreq; |
|
pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", |
|
__func__, policy->cpu, freqs.old, freqs.new); |
|
|
|
cpufreq_freq_transition_begin(policy, &freqs); |
|
} |
|
|
|
retval = cpufreq_driver->target_index(policy, index); |
|
if (retval) |
|
pr_err("%s: Failed to change cpu frequency: %d\n", __func__, |
|
retval); |
|
|
|
if (notify) { |
|
cpufreq_freq_transition_end(policy, &freqs, retval); |
|
|
|
/* |
|
* Failed after setting to intermediate freq? Driver should have |
|
* reverted back to initial frequency and so should we. Check |
|
* here for intermediate_freq instead of get_intermediate, in |
|
* case we haven't switched to intermediate freq at all. |
|
*/ |
|
if (unlikely(retval && intermediate_freq)) { |
|
freqs.old = intermediate_freq; |
|
freqs.new = restore_freq; |
|
cpufreq_freq_transition_begin(policy, &freqs); |
|
cpufreq_freq_transition_end(policy, &freqs, 0); |
|
} |
|
} |
|
|
|
return retval; |
|
} |
|
|
|
int __cpufreq_driver_target(struct cpufreq_policy *policy, |
|
unsigned int target_freq, |
|
unsigned int relation) |
|
{ |
|
unsigned int old_target_freq = target_freq; |
|
|
|
if (cpufreq_disabled()) |
|
return -ENODEV; |
|
|
|
target_freq = __resolve_freq(policy, target_freq, relation); |
|
|
|
pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n", |
|
policy->cpu, target_freq, relation, old_target_freq); |
|
|
|
/* |
|
* This might look like a redundant call as we are checking it again |
|
* after finding index. But it is left intentionally for cases where |
|
* exactly same freq is called again and so we can save on few function |
|
* calls. |
|
*/ |
|
if (target_freq == policy->cur && |
|
!(cpufreq_driver->flags & CPUFREQ_NEED_UPDATE_LIMITS)) |
|
return 0; |
|
|
|
if (cpufreq_driver->target) { |
|
/* |
|
* If the driver hasn't setup a single inefficient frequency, |
|
* it's unlikely it knows how to decode CPUFREQ_RELATION_E. |
|
*/ |
|
if (!policy->efficiencies_available) |
|
relation &= ~CPUFREQ_RELATION_E; |
|
|
|
return cpufreq_driver->target(policy, target_freq, relation); |
|
} |
|
|
|
if (!cpufreq_driver->target_index) |
|
return -EINVAL; |
|
|
|
return __target_index(policy, policy->cached_resolved_idx); |
|
} |
|
EXPORT_SYMBOL_GPL(__cpufreq_driver_target); |
|
|
|
int cpufreq_driver_target(struct cpufreq_policy *policy, |
|
unsigned int target_freq, |
|
unsigned int relation) |
|
{ |
|
int ret; |
|
|
|
down_write(&policy->rwsem); |
|
|
|
ret = __cpufreq_driver_target(policy, target_freq, relation); |
|
|
|
up_write(&policy->rwsem); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_driver_target); |
|
|
|
__weak struct cpufreq_governor *cpufreq_fallback_governor(void) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static int cpufreq_init_governor(struct cpufreq_policy *policy) |
|
{ |
|
int ret; |
|
|
|
/* Don't start any governor operations if we are entering suspend */ |
|
if (cpufreq_suspended) |
|
return 0; |
|
/* |
|
* Governor might not be initiated here if ACPI _PPC changed |
|
* notification happened, so check it. |
|
*/ |
|
if (!policy->governor) |
|
return -EINVAL; |
|
|
|
/* Platform doesn't want dynamic frequency switching ? */ |
|
if (policy->governor->flags & CPUFREQ_GOV_DYNAMIC_SWITCHING && |
|
cpufreq_driver->flags & CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING) { |
|
struct cpufreq_governor *gov = cpufreq_fallback_governor(); |
|
|
|
if (gov) { |
|
pr_warn("Can't use %s governor as dynamic switching is disallowed. Fallback to %s governor\n", |
|
policy->governor->name, gov->name); |
|
policy->governor = gov; |
|
} else { |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
if (!try_module_get(policy->governor->owner)) |
|
return -EINVAL; |
|
|
|
pr_debug("%s: for CPU %u\n", __func__, policy->cpu); |
|
|
|
if (policy->governor->init) { |
|
ret = policy->governor->init(policy); |
|
if (ret) { |
|
module_put(policy->governor->owner); |
|
return ret; |
|
} |
|
} |
|
|
|
policy->strict_target = !!(policy->governor->flags & CPUFREQ_GOV_STRICT_TARGET); |
|
|
|
return 0; |
|
} |
|
|
|
static void cpufreq_exit_governor(struct cpufreq_policy *policy) |
|
{ |
|
if (cpufreq_suspended || !policy->governor) |
|
return; |
|
|
|
pr_debug("%s: for CPU %u\n", __func__, policy->cpu); |
|
|
|
if (policy->governor->exit) |
|
policy->governor->exit(policy); |
|
|
|
module_put(policy->governor->owner); |
|
} |
|
|
|
int cpufreq_start_governor(struct cpufreq_policy *policy) |
|
{ |
|
int ret; |
|
|
|
if (cpufreq_suspended) |
|
return 0; |
|
|
|
if (!policy->governor) |
|
return -EINVAL; |
|
|
|
pr_debug("%s: for CPU %u\n", __func__, policy->cpu); |
|
|
|
if (cpufreq_driver->get) |
|
cpufreq_verify_current_freq(policy, false); |
|
|
|
if (policy->governor->start) { |
|
ret = policy->governor->start(policy); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
if (policy->governor->limits) |
|
policy->governor->limits(policy); |
|
|
|
return 0; |
|
} |
|
|
|
void cpufreq_stop_governor(struct cpufreq_policy *policy) |
|
{ |
|
if (cpufreq_suspended || !policy->governor) |
|
return; |
|
|
|
pr_debug("%s: for CPU %u\n", __func__, policy->cpu); |
|
|
|
if (policy->governor->stop) |
|
policy->governor->stop(policy); |
|
} |
|
|
|
static void cpufreq_governor_limits(struct cpufreq_policy *policy) |
|
{ |
|
if (cpufreq_suspended || !policy->governor) |
|
return; |
|
|
|
pr_debug("%s: for CPU %u\n", __func__, policy->cpu); |
|
|
|
if (policy->governor->limits) |
|
policy->governor->limits(policy); |
|
} |
|
|
|
int cpufreq_register_governor(struct cpufreq_governor *governor) |
|
{ |
|
int err; |
|
|
|
if (!governor) |
|
return -EINVAL; |
|
|
|
if (cpufreq_disabled()) |
|
return -ENODEV; |
|
|
|
mutex_lock(&cpufreq_governor_mutex); |
|
|
|
err = -EBUSY; |
|
if (!find_governor(governor->name)) { |
|
err = 0; |
|
list_add(&governor->governor_list, &cpufreq_governor_list); |
|
} |
|
|
|
mutex_unlock(&cpufreq_governor_mutex); |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_register_governor); |
|
|
|
void cpufreq_unregister_governor(struct cpufreq_governor *governor) |
|
{ |
|
struct cpufreq_policy *policy; |
|
unsigned long flags; |
|
|
|
if (!governor) |
|
return; |
|
|
|
if (cpufreq_disabled()) |
|
return; |
|
|
|
/* clear last_governor for all inactive policies */ |
|
read_lock_irqsave(&cpufreq_driver_lock, flags); |
|
for_each_inactive_policy(policy) { |
|
if (!strcmp(policy->last_governor, governor->name)) { |
|
policy->governor = NULL; |
|
strcpy(policy->last_governor, "\0"); |
|
} |
|
} |
|
read_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
|
|
mutex_lock(&cpufreq_governor_mutex); |
|
list_del(&governor->governor_list); |
|
mutex_unlock(&cpufreq_governor_mutex); |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_unregister_governor); |
|
|
|
|
|
/********************************************************************* |
|
* POLICY INTERFACE * |
|
*********************************************************************/ |
|
|
|
/** |
|
* cpufreq_get_policy - get the current cpufreq_policy |
|
* @policy: struct cpufreq_policy into which the current cpufreq_policy |
|
* is written |
|
* @cpu: CPU to find the policy for |
|
* |
|
* Reads the current cpufreq policy. |
|
*/ |
|
int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *cpu_policy; |
|
if (!policy) |
|
return -EINVAL; |
|
|
|
cpu_policy = cpufreq_cpu_get(cpu); |
|
if (!cpu_policy) |
|
return -EINVAL; |
|
|
|
memcpy(policy, cpu_policy, sizeof(*policy)); |
|
|
|
cpufreq_cpu_put(cpu_policy); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(cpufreq_get_policy); |
|
|
|
/** |
|
* cpufreq_set_policy - Modify cpufreq policy parameters. |
|
* @policy: Policy object to modify. |
|
* @new_gov: Policy governor pointer. |
|
* @new_pol: Policy value (for drivers with built-in governors). |
|
* |
|
* Invoke the cpufreq driver's ->verify() callback to sanity-check the frequency |
|
* limits to be set for the policy, update @policy with the verified limits |
|
* values and either invoke the driver's ->setpolicy() callback (if present) or |
|
* carry out a governor update for @policy. That is, run the current governor's |
|
* ->limits() callback (if @new_gov points to the same object as the one in |
|
* @policy) or replace the governor for @policy with @new_gov. |
|
* |
|
* The cpuinfo part of @policy is not updated by this function. |
|
*/ |
|
static int cpufreq_set_policy(struct cpufreq_policy *policy, |
|
struct cpufreq_governor *new_gov, |
|
unsigned int new_pol) |
|
{ |
|
struct cpufreq_policy_data new_data; |
|
struct cpufreq_governor *old_gov; |
|
int ret; |
|
|
|
memcpy(&new_data.cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); |
|
new_data.freq_table = policy->freq_table; |
|
new_data.cpu = policy->cpu; |
|
/* |
|
* PM QoS framework collects all the requests from users and provide us |
|
* the final aggregated value here. |
|
*/ |
|
new_data.min = freq_qos_read_value(&policy->constraints, FREQ_QOS_MIN); |
|
new_data.max = freq_qos_read_value(&policy->constraints, FREQ_QOS_MAX); |
|
|
|
pr_debug("setting new policy for CPU %u: %u - %u kHz\n", |
|
new_data.cpu, new_data.min, new_data.max); |
|
|
|
/* |
|
* Verify that the CPU speed can be set within these limits and make sure |
|
* that min <= max. |
|
*/ |
|
ret = cpufreq_driver->verify(&new_data); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* Resolve policy min/max to available frequencies. It ensures |
|
* no frequency resolution will neither overshoot the requested maximum |
|
* nor undershoot the requested minimum. |
|
*/ |
|
policy->min = new_data.min; |
|
policy->max = new_data.max; |
|
policy->min = __resolve_freq(policy, policy->min, CPUFREQ_RELATION_L); |
|
policy->max = __resolve_freq(policy, policy->max, CPUFREQ_RELATION_H); |
|
trace_cpu_frequency_limits(policy); |
|
|
|
policy->cached_target_freq = UINT_MAX; |
|
|
|
pr_debug("new min and max freqs are %u - %u kHz\n", |
|
policy->min, policy->max); |
|
|
|
if (cpufreq_driver->setpolicy) { |
|
policy->policy = new_pol; |
|
pr_debug("setting range\n"); |
|
return cpufreq_driver->setpolicy(policy); |
|
} |
|
|
|
if (new_gov == policy->governor) { |
|
pr_debug("governor limits update\n"); |
|
cpufreq_governor_limits(policy); |
|
return 0; |
|
} |
|
|
|
pr_debug("governor switch\n"); |
|
|
|
/* save old, working values */ |
|
old_gov = policy->governor; |
|
/* end old governor */ |
|
if (old_gov) { |
|
cpufreq_stop_governor(policy); |
|
cpufreq_exit_governor(policy); |
|
} |
|
|
|
/* start new governor */ |
|
policy->governor = new_gov; |
|
ret = cpufreq_init_governor(policy); |
|
if (!ret) { |
|
ret = cpufreq_start_governor(policy); |
|
if (!ret) { |
|
pr_debug("governor change\n"); |
|
sched_cpufreq_governor_change(policy, old_gov); |
|
return 0; |
|
} |
|
cpufreq_exit_governor(policy); |
|
} |
|
|
|
/* new governor failed, so re-start old one */ |
|
pr_debug("starting governor %s failed\n", policy->governor->name); |
|
if (old_gov) { |
|
policy->governor = old_gov; |
|
if (cpufreq_init_governor(policy)) |
|
policy->governor = NULL; |
|
else |
|
cpufreq_start_governor(policy); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* cpufreq_update_policy - Re-evaluate an existing cpufreq policy. |
|
* @cpu: CPU to re-evaluate the policy for. |
|
* |
|
* Update the current frequency for the cpufreq policy of @cpu and use |
|
* cpufreq_set_policy() to re-apply the min and max limits, which triggers the |
|
* evaluation of policy notifiers and the cpufreq driver's ->verify() callback |
|
* for the policy in question, among other things. |
|
*/ |
|
void cpufreq_update_policy(unsigned int cpu) |
|
{ |
|
struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu); |
|
|
|
if (!policy) |
|
return; |
|
|
|
/* |
|
* BIOS might change freq behind our back |
|
* -> ask driver for current freq and notify governors about a change |
|
*/ |
|
if (cpufreq_driver->get && has_target() && |
|
(cpufreq_suspended || WARN_ON(!cpufreq_verify_current_freq(policy, false)))) |
|
goto unlock; |
|
|
|
refresh_frequency_limits(policy); |
|
|
|
unlock: |
|
cpufreq_cpu_release(policy); |
|
} |
|
EXPORT_SYMBOL(cpufreq_update_policy); |
|
|
|
/** |
|
* cpufreq_update_limits - Update policy limits for a given CPU. |
|
* @cpu: CPU to update the policy limits for. |
|
* |
|
* Invoke the driver's ->update_limits callback if present or call |
|
* cpufreq_update_policy() for @cpu. |
|
*/ |
|
void cpufreq_update_limits(unsigned int cpu) |
|
{ |
|
if (cpufreq_driver->update_limits) |
|
cpufreq_driver->update_limits(cpu); |
|
else |
|
cpufreq_update_policy(cpu); |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_update_limits); |
|
|
|
/********************************************************************* |
|
* BOOST * |
|
*********************************************************************/ |
|
static int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state) |
|
{ |
|
int ret; |
|
|
|
if (!policy->freq_table) |
|
return -ENXIO; |
|
|
|
ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table); |
|
if (ret) { |
|
pr_err("%s: Policy frequency update failed\n", __func__); |
|
return ret; |
|
} |
|
|
|
ret = freq_qos_update_request(policy->max_freq_req, policy->max); |
|
if (ret < 0) |
|
return ret; |
|
|
|
return 0; |
|
} |
|
|
|
int cpufreq_boost_trigger_state(int state) |
|
{ |
|
struct cpufreq_policy *policy; |
|
unsigned long flags; |
|
int ret = 0; |
|
|
|
if (cpufreq_driver->boost_enabled == state) |
|
return 0; |
|
|
|
write_lock_irqsave(&cpufreq_driver_lock, flags); |
|
cpufreq_driver->boost_enabled = state; |
|
write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
|
|
cpus_read_lock(); |
|
for_each_active_policy(policy) { |
|
ret = cpufreq_driver->set_boost(policy, state); |
|
if (ret) |
|
goto err_reset_state; |
|
} |
|
cpus_read_unlock(); |
|
|
|
return 0; |
|
|
|
err_reset_state: |
|
cpus_read_unlock(); |
|
|
|
write_lock_irqsave(&cpufreq_driver_lock, flags); |
|
cpufreq_driver->boost_enabled = !state; |
|
write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
|
|
pr_err("%s: Cannot %s BOOST\n", |
|
__func__, state ? "enable" : "disable"); |
|
|
|
return ret; |
|
} |
|
|
|
static bool cpufreq_boost_supported(void) |
|
{ |
|
return cpufreq_driver->set_boost; |
|
} |
|
|
|
static int create_boost_sysfs_file(void) |
|
{ |
|
int ret; |
|
|
|
ret = sysfs_create_file(cpufreq_global_kobject, &boost.attr); |
|
if (ret) |
|
pr_err("%s: cannot register global BOOST sysfs file\n", |
|
__func__); |
|
|
|
return ret; |
|
} |
|
|
|
static void remove_boost_sysfs_file(void) |
|
{ |
|
if (cpufreq_boost_supported()) |
|
sysfs_remove_file(cpufreq_global_kobject, &boost.attr); |
|
} |
|
|
|
int cpufreq_enable_boost_support(void) |
|
{ |
|
if (!cpufreq_driver) |
|
return -EINVAL; |
|
|
|
if (cpufreq_boost_supported()) |
|
return 0; |
|
|
|
cpufreq_driver->set_boost = cpufreq_boost_set_sw; |
|
|
|
/* This will get removed on driver unregister */ |
|
return create_boost_sysfs_file(); |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_enable_boost_support); |
|
|
|
int cpufreq_boost_enabled(void) |
|
{ |
|
return cpufreq_driver->boost_enabled; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_boost_enabled); |
|
|
|
/********************************************************************* |
|
* REGISTER / UNREGISTER CPUFREQ DRIVER * |
|
*********************************************************************/ |
|
static enum cpuhp_state hp_online; |
|
|
|
static int cpuhp_cpufreq_online(unsigned int cpu) |
|
{ |
|
cpufreq_online(cpu); |
|
|
|
return 0; |
|
} |
|
|
|
static int cpuhp_cpufreq_offline(unsigned int cpu) |
|
{ |
|
cpufreq_offline(cpu); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* cpufreq_register_driver - register a CPU Frequency driver |
|
* @driver_data: A struct cpufreq_driver containing the values# |
|
* submitted by the CPU Frequency driver. |
|
* |
|
* Registers a CPU Frequency driver to this core code. This code |
|
* returns zero on success, -EEXIST when another driver got here first |
|
* (and isn't unregistered in the meantime). |
|
* |
|
*/ |
|
int cpufreq_register_driver(struct cpufreq_driver *driver_data) |
|
{ |
|
unsigned long flags; |
|
int ret; |
|
|
|
if (cpufreq_disabled()) |
|
return -ENODEV; |
|
|
|
/* |
|
* The cpufreq core depends heavily on the availability of device |
|
* structure, make sure they are available before proceeding further. |
|
*/ |
|
if (!get_cpu_device(0)) |
|
return -EPROBE_DEFER; |
|
|
|
if (!driver_data || !driver_data->verify || !driver_data->init || |
|
!(driver_data->setpolicy || driver_data->target_index || |
|
driver_data->target) || |
|
(driver_data->setpolicy && (driver_data->target_index || |
|
driver_data->target)) || |
|
(!driver_data->get_intermediate != !driver_data->target_intermediate) || |
|
(!driver_data->online != !driver_data->offline)) |
|
return -EINVAL; |
|
|
|
pr_debug("trying to register driver %s\n", driver_data->name); |
|
|
|
/* Protect against concurrent CPU online/offline. */ |
|
cpus_read_lock(); |
|
|
|
write_lock_irqsave(&cpufreq_driver_lock, flags); |
|
if (cpufreq_driver) { |
|
write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
ret = -EEXIST; |
|
goto out; |
|
} |
|
cpufreq_driver = driver_data; |
|
write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
|
|
/* |
|
* Mark support for the scheduler's frequency invariance engine for |
|
* drivers that implement target(), target_index() or fast_switch(). |
|
*/ |
|
if (!cpufreq_driver->setpolicy) { |
|
static_branch_enable_cpuslocked(&cpufreq_freq_invariance); |
|
pr_debug("supports frequency invariance"); |
|
} |
|
|
|
if (driver_data->setpolicy) |
|
driver_data->flags |= CPUFREQ_CONST_LOOPS; |
|
|
|
if (cpufreq_boost_supported()) { |
|
ret = create_boost_sysfs_file(); |
|
if (ret) |
|
goto err_null_driver; |
|
} |
|
|
|
ret = subsys_interface_register(&cpufreq_interface); |
|
if (ret) |
|
goto err_boost_unreg; |
|
|
|
if (unlikely(list_empty(&cpufreq_policy_list))) { |
|
/* if all ->init() calls failed, unregister */ |
|
ret = -ENODEV; |
|
pr_debug("%s: No CPU initialized for driver %s\n", __func__, |
|
driver_data->name); |
|
goto err_if_unreg; |
|
} |
|
|
|
ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN, |
|
"cpufreq:online", |
|
cpuhp_cpufreq_online, |
|
cpuhp_cpufreq_offline); |
|
if (ret < 0) |
|
goto err_if_unreg; |
|
hp_online = ret; |
|
ret = 0; |
|
|
|
pr_debug("driver %s up and running\n", driver_data->name); |
|
goto out; |
|
|
|
err_if_unreg: |
|
subsys_interface_unregister(&cpufreq_interface); |
|
err_boost_unreg: |
|
remove_boost_sysfs_file(); |
|
err_null_driver: |
|
write_lock_irqsave(&cpufreq_driver_lock, flags); |
|
cpufreq_driver = NULL; |
|
write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
out: |
|
cpus_read_unlock(); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_register_driver); |
|
|
|
/* |
|
* cpufreq_unregister_driver - unregister the current CPUFreq driver |
|
* |
|
* Unregister the current CPUFreq driver. Only call this if you have |
|
* the right to do so, i.e. if you have succeeded in initialising before! |
|
* Returns zero if successful, and -EINVAL if the cpufreq_driver is |
|
* currently not initialised. |
|
*/ |
|
int cpufreq_unregister_driver(struct cpufreq_driver *driver) |
|
{ |
|
unsigned long flags; |
|
|
|
if (!cpufreq_driver || (driver != cpufreq_driver)) |
|
return -EINVAL; |
|
|
|
pr_debug("unregistering driver %s\n", driver->name); |
|
|
|
/* Protect against concurrent cpu hotplug */ |
|
cpus_read_lock(); |
|
subsys_interface_unregister(&cpufreq_interface); |
|
remove_boost_sysfs_file(); |
|
static_branch_disable_cpuslocked(&cpufreq_freq_invariance); |
|
cpuhp_remove_state_nocalls_cpuslocked(hp_online); |
|
|
|
write_lock_irqsave(&cpufreq_driver_lock, flags); |
|
|
|
cpufreq_driver = NULL; |
|
|
|
write_unlock_irqrestore(&cpufreq_driver_lock, flags); |
|
cpus_read_unlock(); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(cpufreq_unregister_driver); |
|
|
|
static int __init cpufreq_core_init(void) |
|
{ |
|
struct cpufreq_governor *gov = cpufreq_default_governor(); |
|
|
|
if (cpufreq_disabled()) |
|
return -ENODEV; |
|
|
|
cpufreq_global_kobject = kobject_create_and_add("cpufreq", &cpu_subsys.dev_root->kobj); |
|
BUG_ON(!cpufreq_global_kobject); |
|
|
|
if (!strlen(default_governor)) |
|
strncpy(default_governor, gov->name, CPUFREQ_NAME_LEN); |
|
|
|
return 0; |
|
} |
|
module_param(off, int, 0444); |
|
module_param_string(default_governor, default_governor, CPUFREQ_NAME_LEN, 0444); |
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core_initcall(cpufreq_core_init);
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