^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/drivers/cpufreq/cpufreq.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2001 Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * (C) 2013 Viresh Kumar <viresh.kumar@linaro.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Oct 2005 - Ashok Raj <ashok.raj@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Added handling for CPU hotplug
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Feb 2006 - Jacob Shin <jacob.shin@amd.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Fix handling for CPU hotplug -- affected CPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/cpufreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/cpufreq_times.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/cpu_cooling.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/kernel_stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/pm_qos.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/syscore_ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/tick.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <trace/events/power.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <trace/hooks/cpufreq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static LIST_HEAD(cpufreq_policy_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* Macros to iterate over CPU policies */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define for_each_suitable_policy(__policy, __active) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if ((__active) == !policy_is_inactive(__policy))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define for_each_active_policy(__policy) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) for_each_suitable_policy(__policy, true)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define for_each_inactive_policy(__policy) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) for_each_suitable_policy(__policy, false)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define for_each_policy(__policy) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) list_for_each_entry(__policy, &cpufreq_policy_list, policy_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /* Iterate over governors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static LIST_HEAD(cpufreq_governor_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define for_each_governor(__governor) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) list_for_each_entry(__governor, &cpufreq_governor_list, governor_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static char default_governor[CPUFREQ_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * The "cpufreq driver" - the arch- or hardware-dependent low
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * level driver of CPUFreq support, and its spinlock. This lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * also protects the cpufreq_cpu_data array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static struct cpufreq_driver *cpufreq_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static DEFINE_RWLOCK(cpufreq_driver_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static DEFINE_STATIC_KEY_FALSE(cpufreq_freq_invariance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) bool cpufreq_supports_freq_invariance(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return static_branch_likely(&cpufreq_freq_invariance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* Flag to suspend/resume CPUFreq governors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static bool cpufreq_suspended;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) static inline bool has_target(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return cpufreq_driver->target_index || cpufreq_driver->target;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* internal prototypes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static unsigned int __cpufreq_get(struct cpufreq_policy *policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static int cpufreq_init_governor(struct cpufreq_policy *policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static void cpufreq_exit_governor(struct cpufreq_policy *policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static void cpufreq_governor_limits(struct cpufreq_policy *policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static int cpufreq_set_policy(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct cpufreq_governor *new_gov,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) unsigned int new_pol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * Two notifier lists: the "policy" list is involved in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * validation process for a new CPU frequency policy; the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * "transition" list for kernel code that needs to handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * changes to devices when the CPU clock speed changes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * The mutex locks both lists.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) SRCU_NOTIFIER_HEAD_STATIC(cpufreq_transition_notifier_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static int off __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static int cpufreq_disabled(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) void disable_cpufreq(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) off = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static DEFINE_MUTEX(cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) bool have_governor_per_policy(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) EXPORT_SYMBOL_GPL(have_governor_per_policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static struct kobject *cpufreq_global_kobject;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (have_governor_per_policy())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return &policy->kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return cpufreq_global_kobject;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) EXPORT_SYMBOL_GPL(get_governor_parent_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct kernel_cpustat kcpustat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) u64 cur_wall_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) u64 idle_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) u64 busy_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) cur_wall_time = jiffies64_to_nsecs(get_jiffies_64());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) kcpustat_cpu_fetch(&kcpustat, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) busy_time = kcpustat.cpustat[CPUTIME_USER];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) busy_time += kcpustat.cpustat[CPUTIME_SYSTEM];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) busy_time += kcpustat.cpustat[CPUTIME_IRQ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) busy_time += kcpustat.cpustat[CPUTIME_SOFTIRQ];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) busy_time += kcpustat.cpustat[CPUTIME_STEAL];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) busy_time += kcpustat.cpustat[CPUTIME_NICE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) idle_time = cur_wall_time - busy_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (wall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) *wall = div_u64(cur_wall_time, NSEC_PER_USEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return div_u64(idle_time, NSEC_PER_USEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (idle_time == -1ULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return get_cpu_idle_time_jiffy(cpu, wall);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) else if (!io_busy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) idle_time += get_cpu_iowait_time_us(cpu, wall);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return idle_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) EXPORT_SYMBOL_GPL(get_cpu_idle_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * This is a generic cpufreq init() routine which can be used by cpufreq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * drivers of SMP systems. It will do following:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * - validate & show freq table passed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * - set policies transition latency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * - policy->cpus with all possible CPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) void cpufreq_generic_init(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) struct cpufreq_frequency_table *table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) unsigned int transition_latency)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) policy->freq_table = table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) policy->cpuinfo.transition_latency = transition_latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * The driver only supports the SMP configuration where all processors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * share the clock and voltage and clock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) cpumask_setall(policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) EXPORT_SYMBOL_GPL(cpufreq_generic_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) unsigned int cpufreq_generic_get(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (!policy || IS_ERR(policy->clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) pr_err("%s: No %s associated to cpu: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) __func__, policy ? "clk" : "policy", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) return clk_get_rate(policy->clk) / 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) EXPORT_SYMBOL_GPL(cpufreq_generic_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * cpufreq_cpu_get - Return policy for a CPU and mark it as busy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * @cpu: CPU to find the policy for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * Call cpufreq_cpu_get_raw() to obtain a cpufreq policy for @cpu and increment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * the kobject reference counter of that policy. Return a valid policy on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * success or NULL on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * The policy returned by this function has to be released with the help of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * cpufreq_cpu_put() to balance its kobject reference counter properly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct cpufreq_policy *policy = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (WARN_ON(cpu >= nr_cpu_ids))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) /* get the cpufreq driver */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) read_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (cpufreq_driver) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* get the CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) policy = cpufreq_cpu_get_raw(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) if (policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) kobject_get(&policy->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) read_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) EXPORT_SYMBOL_GPL(cpufreq_cpu_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * cpufreq_cpu_put - Decrement kobject usage counter for cpufreq policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * @policy: cpufreq policy returned by cpufreq_cpu_get().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) void cpufreq_cpu_put(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) kobject_put(&policy->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * cpufreq_cpu_release - Unlock a policy and decrement its usage counter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * @policy: cpufreq policy returned by cpufreq_cpu_acquire().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) void cpufreq_cpu_release(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (WARN_ON(!policy))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) lockdep_assert_held(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) cpufreq_cpu_put(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) * cpufreq_cpu_acquire - Find policy for a CPU, mark it as busy and lock it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) * @cpu: CPU to find the policy for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * Call cpufreq_cpu_get() to get a reference on the cpufreq policy for @cpu and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * if the policy returned by it is not NULL, acquire its rwsem for writing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * Return the policy if it is active or release it and return NULL otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * The policy returned by this function has to be released with the help of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) * cpufreq_cpu_release() in order to release its rwsem and balance its usage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * counter properly.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (!policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (policy_is_inactive(policy)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) cpufreq_cpu_release(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) return policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) * EXTERNALLY AFFECTING FREQUENCY CHANGES *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * adjust_jiffies - adjust the system "loops_per_jiffy"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * This function alters the system "loops_per_jiffy" for the clock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * speed change. Note that loops_per_jiffy cannot be updated on SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * systems as each CPU might be scaled differently. So, use the arch
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * per-CPU loops_per_jiffy value wherever possible.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) #ifndef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static unsigned long l_p_j_ref;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) static unsigned int l_p_j_ref_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (ci->flags & CPUFREQ_CONST_LOOPS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) if (!l_p_j_ref_freq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) l_p_j_ref = loops_per_jiffy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) l_p_j_ref_freq = ci->old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) l_p_j_ref, l_p_j_ref_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) ci->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) loops_per_jiffy, ci->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * cpufreq_notify_transition - Notify frequency transition and adjust_jiffies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * @policy: cpufreq policy to enable fast frequency switching for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * @freqs: contain details of the frequency update.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * @state: set to CPUFREQ_PRECHANGE or CPUFREQ_POSTCHANGE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * This function calls the transition notifiers and the "adjust_jiffies"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * function. It is called twice on all CPU frequency changes that have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * external effects.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) static void cpufreq_notify_transition(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) struct cpufreq_freqs *freqs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) unsigned int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) BUG_ON(irqs_disabled());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (cpufreq_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) freqs->policy = policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) freqs->flags = cpufreq_driver->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) pr_debug("notification %u of frequency transition to %u kHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) state, freqs->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) switch (state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) case CPUFREQ_PRECHANGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) * Detect if the driver reported a value as "old frequency"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) * which is not equal to what the cpufreq core thinks is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * "old frequency".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (policy->cur && policy->cur != freqs->old) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) freqs->old, policy->cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) freqs->old = policy->cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) CPUFREQ_PRECHANGE, freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) case CPUFREQ_POSTCHANGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) pr_debug("FREQ: %u - CPUs: %*pbl\n", freqs->new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) cpumask_pr_args(policy->cpus));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) for_each_cpu(cpu, policy->cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) trace_cpu_frequency(freqs->new, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) CPUFREQ_POSTCHANGE, freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) cpufreq_stats_record_transition(policy, freqs->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) cpufreq_times_record_transition(policy, freqs->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) policy->cur = freqs->new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) trace_android_rvh_cpufreq_transition(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /* Do post notifications when there are chances that transition has failed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) static void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct cpufreq_freqs *freqs, int transition_failed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (!transition_failed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) swap(freqs->old, freqs->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct cpufreq_freqs *freqs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * Catch double invocations of _begin() which lead to self-deadlock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * ASYNC_NOTIFICATION drivers are left out because the cpufreq core
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * doesn't invoke _begin() on their behalf, and hence the chances of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * double invocations are very low. Moreover, there are scenarios
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * where these checks can emit false-positive warnings in these
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) * drivers; so we avoid that by skipping them altogether.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) && current == policy->transition_task);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) wait:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) wait_event(policy->transition_wait, !policy->transition_ongoing);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) spin_lock(&policy->transition_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (unlikely(policy->transition_ongoing)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) spin_unlock(&policy->transition_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) goto wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) policy->transition_ongoing = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) policy->transition_task = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) spin_unlock(&policy->transition_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) struct cpufreq_freqs *freqs, int transition_failed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) if (WARN_ON(!policy->transition_ongoing))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) cpufreq_notify_post_transition(policy, freqs, transition_failed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) arch_set_freq_scale(policy->related_cpus,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) policy->cur,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) policy->cpuinfo.max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) policy->transition_ongoing = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) policy->transition_task = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) wake_up(&policy->transition_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * Fast frequency switching status count. Positive means "enabled", negative
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) * means "disabled" and 0 means "not decided yet".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) static int cpufreq_fast_switch_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static DEFINE_MUTEX(cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) static void cpufreq_list_transition_notifiers(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) struct notifier_block *nb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) pr_info("Registered transition notifiers:\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) mutex_lock(&cpufreq_transition_notifier_list.mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) pr_info("%pS\n", nb->notifier_call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) mutex_unlock(&cpufreq_transition_notifier_list.mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * cpufreq_enable_fast_switch - Enable fast frequency switching for policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) * @policy: cpufreq policy to enable fast frequency switching for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) * Try to enable fast frequency switching for @policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * The attempt will fail if there is at least one transition notifier registered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) * at this point, as fast frequency switching is quite fundamentally at odds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) * with transition notifiers. Thus if successful, it will make registration of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) * transition notifiers fail going forward.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) void cpufreq_enable_fast_switch(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) lockdep_assert_held(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (!policy->fast_switch_possible)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) mutex_lock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) if (cpufreq_fast_switch_count >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) cpufreq_fast_switch_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) policy->fast_switch_enabled = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) pr_warn("CPU%u: Fast frequency switching not enabled\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) cpufreq_list_transition_notifiers();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) mutex_unlock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) EXPORT_SYMBOL_GPL(cpufreq_enable_fast_switch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * cpufreq_disable_fast_switch - Disable fast frequency switching for policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) * @policy: cpufreq policy to disable fast frequency switching for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) void cpufreq_disable_fast_switch(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) mutex_lock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (policy->fast_switch_enabled) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) policy->fast_switch_enabled = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (!WARN_ON(cpufreq_fast_switch_count <= 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) cpufreq_fast_switch_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) mutex_unlock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) EXPORT_SYMBOL_GPL(cpufreq_disable_fast_switch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) * cpufreq_driver_resolve_freq - Map a target frequency to a driver-supported
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) * one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) * @policy: associated policy to interrogate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * @target_freq: target frequency to resolve.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) * The target to driver frequency mapping is cached in the policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) * Return: Lowest driver-supported frequency greater than or equal to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) * given target_freq, subject to policy (min/max) and driver limitations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) unsigned int target_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) unsigned int old_target_freq = target_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) target_freq = clamp_val(target_freq, policy->min, policy->max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) trace_android_vh_cpufreq_resolve_freq(policy, target_freq, old_target_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) policy->cached_target_freq = target_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) if (cpufreq_driver->target_index) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) unsigned int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) idx = cpufreq_frequency_table_target(policy, target_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) CPUFREQ_RELATION_L);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) policy->cached_resolved_idx = idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) return policy->freq_table[idx].frequency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) if (cpufreq_driver->resolve_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) return cpufreq_driver->resolve_freq(policy, target_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) return target_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) EXPORT_SYMBOL_GPL(cpufreq_driver_resolve_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) unsigned int latency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) if (policy->transition_delay_us)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) return policy->transition_delay_us;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) latency = policy->cpuinfo.transition_latency / NSEC_PER_USEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) if (latency) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * For platforms that can change the frequency very fast (< 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * us), the above formula gives a decent transition delay. But
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) * for platforms where transition_latency is in milliseconds, it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * ends up giving unrealistic values.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * Cap the default transition delay to 10 ms, which seems to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) * a reasonable amount of time after which we should reevaluate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) * the frequency.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) return min(latency * LATENCY_MULTIPLIER, (unsigned int)10000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) return LATENCY_MULTIPLIER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) EXPORT_SYMBOL_GPL(cpufreq_policy_transition_delay_us);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) * SYSFS INTERFACE *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) static ssize_t show_boost(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) struct kobj_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) static ssize_t store_boost(struct kobject *kobj, struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) int ret, enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) ret = sscanf(buf, "%d", &enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) if (ret != 1 || enable < 0 || enable > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (cpufreq_boost_trigger_state(enable)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) pr_err("%s: Cannot %s BOOST!\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) __func__, enable ? "enable" : "disable");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) pr_debug("%s: cpufreq BOOST %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) __func__, enable ? "enabled" : "disabled");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) define_one_global_rw(boost);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) static struct cpufreq_governor *find_governor(const char *str_governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) struct cpufreq_governor *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) for_each_governor(t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) static struct cpufreq_governor *get_governor(const char *str_governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) struct cpufreq_governor *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) mutex_lock(&cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) t = find_governor(str_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) if (!t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (!try_module_get(t->owner))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) t = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) mutex_unlock(&cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) static unsigned int cpufreq_parse_policy(char *str_governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) return CPUFREQ_POLICY_PERFORMANCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) if (!strncasecmp(str_governor, "powersave", CPUFREQ_NAME_LEN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) return CPUFREQ_POLICY_POWERSAVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) return CPUFREQ_POLICY_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) * cpufreq_parse_governor - parse a governor string only for has_target()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) * @str_governor: Governor name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) static struct cpufreq_governor *cpufreq_parse_governor(char *str_governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) struct cpufreq_governor *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) t = get_governor(str_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) if (t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) if (request_module("cpufreq_%s", str_governor))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) return get_governor(str_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) * cpufreq_per_cpu_attr_read() / show_##file_name() -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) * print out cpufreq information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) * Write out information from cpufreq_driver->policy[cpu]; object must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) * "unsigned int".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) #define show_one(file_name, object) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) static ssize_t show_##file_name \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) (struct cpufreq_policy *policy, char *buf) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) return sprintf(buf, "%u\n", policy->object); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) static ssize_t show_cpuinfo_max_freq(struct cpufreq_policy *policy, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) unsigned int max_freq = policy->cpuinfo.max_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) trace_android_vh_show_max_freq(policy, &max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) trace_android_rvh_show_max_freq(policy, &max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) return sprintf(buf, "%u\n", max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) show_one(cpuinfo_min_freq, cpuinfo.min_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) show_one(scaling_min_freq, min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) show_one(scaling_max_freq, max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) __weak unsigned int arch_freq_get_on_cpu(int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) unsigned int freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) freq = arch_freq_get_on_cpu(policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) if (freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) ret = sprintf(buf, "%u\n", freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) else if (cpufreq_driver->setpolicy && cpufreq_driver->get)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) ret = sprintf(buf, "%u\n", policy->cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) #define store_one(file_name, object) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) static ssize_t store_##file_name \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) (struct cpufreq_policy *policy, const char *buf, size_t count) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) unsigned long val; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) int ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) ret = sscanf(buf, "%lu", &val); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) if (ret != 1) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) return -EINVAL; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) ret = freq_qos_update_request(policy->object##_freq_req, val);\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) return ret >= 0 ? count : ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) store_one(scaling_min_freq, min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) store_one(scaling_max_freq, max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) unsigned int cur_freq = __cpufreq_get(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) if (cur_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) return sprintf(buf, "%u\n", cur_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) return sprintf(buf, "<unknown>\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) * show_scaling_governor - show the current policy for the specified CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) if (policy->policy == CPUFREQ_POLICY_POWERSAVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) return sprintf(buf, "powersave\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) return sprintf(buf, "performance\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) else if (policy->governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) policy->governor->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) * store_scaling_governor - store policy for the specified CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) char str_governor[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) ret = sscanf(buf, "%15s", str_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) if (ret != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) if (cpufreq_driver->setpolicy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) unsigned int new_pol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) new_pol = cpufreq_parse_policy(str_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) if (!new_pol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) ret = cpufreq_set_policy(policy, NULL, new_pol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) struct cpufreq_governor *new_gov;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) new_gov = cpufreq_parse_governor(str_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) if (!new_gov)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) ret = cpufreq_set_policy(policy, new_gov,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) CPUFREQ_POLICY_UNKNOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) module_put(new_gov->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) return ret ? ret : count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) * show_scaling_driver - show the cpufreq driver currently loaded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) * show_scaling_available_governors - show the available CPUfreq governors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) ssize_t i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) struct cpufreq_governor *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) if (!has_target()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) i += sprintf(buf, "performance powersave");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) mutex_lock(&cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) for_each_governor(t) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) - (CPUFREQ_NAME_LEN + 2)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) mutex_unlock(&cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) i += sprintf(&buf[i], "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) ssize_t i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) for_each_cpu(cpu, mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) if (i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) if (i >= (PAGE_SIZE - 5))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) i += sprintf(&buf[i], "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) EXPORT_SYMBOL_GPL(cpufreq_show_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) * show_related_cpus - show the CPUs affected by each transition even if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) * hw coordination is in use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) return cpufreq_show_cpus(policy->related_cpus, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) * show_affected_cpus - show the CPUs affected by each transition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) return cpufreq_show_cpus(policy->cpus, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) unsigned int freq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) unsigned int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) if (!policy->governor || !policy->governor->store_setspeed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) ret = sscanf(buf, "%u", &freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) if (ret != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) policy->governor->store_setspeed(policy, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) if (!policy->governor || !policy->governor->show_setspeed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) return sprintf(buf, "<unsupported>\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) return policy->governor->show_setspeed(policy, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) * show_bios_limit - show the current cpufreq HW/BIOS limitation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) unsigned int limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) ret = cpufreq_driver->bios_limit(policy->cpu, &limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) return sprintf(buf, "%u\n", limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) return sprintf(buf, "%u\n", policy->cpuinfo.max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) cpufreq_freq_attr_ro(cpuinfo_min_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) cpufreq_freq_attr_ro(cpuinfo_max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) cpufreq_freq_attr_ro(cpuinfo_transition_latency);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) cpufreq_freq_attr_ro(scaling_available_governors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) cpufreq_freq_attr_ro(scaling_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) cpufreq_freq_attr_ro(scaling_cur_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) cpufreq_freq_attr_ro(bios_limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) cpufreq_freq_attr_ro(related_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) cpufreq_freq_attr_ro(affected_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) cpufreq_freq_attr_rw(scaling_min_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) cpufreq_freq_attr_rw(scaling_max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) cpufreq_freq_attr_rw(scaling_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) cpufreq_freq_attr_rw(scaling_setspeed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) static struct attribute *default_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) &cpuinfo_min_freq.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) &cpuinfo_max_freq.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) &cpuinfo_transition_latency.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) &scaling_min_freq.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) &scaling_max_freq.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) &affected_cpus.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) &related_cpus.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) &scaling_governor.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) &scaling_driver.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) &scaling_available_governors.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) &scaling_setspeed.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) #define to_policy(k) container_of(k, struct cpufreq_policy, kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) #define to_attr(a) container_of(a, struct freq_attr, attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) struct cpufreq_policy *policy = to_policy(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) struct freq_attr *fattr = to_attr(attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) if (!fattr->show)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) down_read(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) ret = fattr->show(policy, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) up_read(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) static ssize_t store(struct kobject *kobj, struct attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) struct cpufreq_policy *policy = to_policy(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) struct freq_attr *fattr = to_attr(attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) ssize_t ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) if (!fattr->store)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * cpus_read_trylock() is used here to work around a circular lock
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * dependency problem with respect to the cpufreq_register_driver().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) if (!cpus_read_trylock())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) if (cpu_online(policy->cpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) ret = fattr->store(policy, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) cpus_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) static void cpufreq_sysfs_release(struct kobject *kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) struct cpufreq_policy *policy = to_policy(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) pr_debug("last reference is dropped\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) complete(&policy->kobj_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) static const struct sysfs_ops sysfs_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) .show = show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) .store = store,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) static struct kobj_type ktype_cpufreq = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) .sysfs_ops = &sysfs_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) .default_attrs = default_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) .release = cpufreq_sysfs_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) if (unlikely(!dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) if (cpumask_test_and_set_cpu(cpu, policy->real_cpus))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) dev_dbg(dev, "%s: Adding symlink\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) if (sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) dev_err(dev, "cpufreq symlink creation failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) static void remove_cpu_dev_symlink(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) dev_dbg(dev, "%s: Removing symlink\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) sysfs_remove_link(&dev->kobj, "cpufreq");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) static int cpufreq_add_dev_interface(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) struct freq_attr **drv_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) /* set up files for this cpu device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) drv_attr = cpufreq_driver->attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) while (drv_attr && *drv_attr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) drv_attr++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) if (cpufreq_driver->get) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) if (cpufreq_driver->bios_limit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) ret = sysfs_create_file(&policy->kobj, &bios_limit.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) static int cpufreq_init_policy(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) struct cpufreq_governor *gov = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) unsigned int pol = CPUFREQ_POLICY_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) if (has_target()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) /* Update policy governor to the one used before hotplug. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) gov = get_governor(policy->last_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) if (gov) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) pr_debug("Restoring governor %s for cpu %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) gov->name, policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) gov = get_governor(default_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) if (!gov) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) gov = cpufreq_default_governor();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) __module_get(gov->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) /* Use the default policy if there is no last_policy. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) if (policy->last_policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) pol = policy->last_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) pol = cpufreq_parse_policy(default_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) * In case the default governor is neither "performance"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) * nor "powersave", fall back to the initial policy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) * value set by the driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) if (pol == CPUFREQ_POLICY_UNKNOWN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) pol = policy->policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) if (pol != CPUFREQ_POLICY_PERFORMANCE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) pol != CPUFREQ_POLICY_POWERSAVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) return -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) ret = cpufreq_set_policy(policy, gov, pol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) if (gov)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) module_put(gov->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) /* Has this CPU been taken care of already? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128) if (cpumask_test_cpu(cpu, policy->cpus))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) if (has_target())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) cpufreq_stop_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) cpumask_set_cpu(cpu, policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) if (has_target()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) ret = cpufreq_start_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) pr_err("%s: Failed to start governor\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) void refresh_frequency_limits(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) if (!policy_is_inactive(policy)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) pr_debug("updating policy for CPU %u\n", policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) cpufreq_set_policy(policy, policy->governor, policy->policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) EXPORT_SYMBOL(refresh_frequency_limits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) static void handle_update(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) struct cpufreq_policy *policy =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) container_of(work, struct cpufreq_policy, update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) pr_debug("handle_update for cpu %u called\n", policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) refresh_frequency_limits(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) static int cpufreq_notifier_min(struct notifier_block *nb, unsigned long freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) schedule_work(&policy->update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) static int cpufreq_notifier_max(struct notifier_block *nb, unsigned long freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) schedule_work(&policy->update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) struct kobject *kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) struct completion *cmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) cpufreq_stats_free_table(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) kobj = &policy->kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) cmp = &policy->kobj_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) kobject_put(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) * We need to make sure that the underlying kobj is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) * actually not referenced anymore by anybody before we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) * proceed with unloading.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) pr_debug("waiting for dropping of refcount\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) wait_for_completion(cmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) pr_debug("wait complete\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) struct device *dev = get_cpu_device(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) policy = kzalloc(sizeof(*policy), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) if (!policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) goto err_free_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) goto err_free_cpumask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) goto err_free_rcpumask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) cpufreq_global_kobject, "policy%u", cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) dev_err(dev, "%s: failed to init policy->kobj: %d\n", __func__, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) * The entire policy object will be freed below, but the extra
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) * memory allocated for the kobject name needs to be freed by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) * releasing the kobject.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) kobject_put(&policy->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) goto err_free_real_cpus;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) freq_constraints_init(&policy->constraints);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) policy->nb_min.notifier_call = cpufreq_notifier_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) policy->nb_max.notifier_call = cpufreq_notifier_max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) &policy->nb_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) dev_err(dev, "Failed to register MIN QoS notifier: %d (%*pbl)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) ret, cpumask_pr_args(policy->cpus));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) goto err_kobj_remove;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) &policy->nb_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) dev_err(dev, "Failed to register MAX QoS notifier: %d (%*pbl)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) ret, cpumask_pr_args(policy->cpus));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) goto err_min_qos_notifier;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) INIT_LIST_HEAD(&policy->policy_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) init_rwsem(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) spin_lock_init(&policy->transition_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) init_waitqueue_head(&policy->transition_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) init_completion(&policy->kobj_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) INIT_WORK(&policy->update, handle_update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) policy->cpu = cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) return policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) err_min_qos_notifier:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) &policy->nb_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) err_kobj_remove:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) cpufreq_policy_put_kobj(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) err_free_real_cpus:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) free_cpumask_var(policy->real_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) err_free_rcpumask:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) free_cpumask_var(policy->related_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) err_free_cpumask:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) free_cpumask_var(policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) err_free_policy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) kfree(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) static void cpufreq_policy_free(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) /* Remove policy from list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) write_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) list_del(&policy->policy_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) for_each_cpu(cpu, policy->related_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) per_cpu(cpufreq_cpu_data, cpu) = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) write_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) &policy->nb_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305) freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) &policy->nb_min);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) /* Cancel any pending policy->update work before freeing the policy. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) cancel_work_sync(&policy->update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) if (policy->max_freq_req) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) * CPUFREQ_CREATE_POLICY notification is sent only after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) * successfully adding max_freq_req request.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) CPUFREQ_REMOVE_POLICY, policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) freq_qos_remove_request(policy->max_freq_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) freq_qos_remove_request(policy->min_freq_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) kfree(policy->min_freq_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) cpufreq_policy_put_kobj(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) free_cpumask_var(policy->real_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) free_cpumask_var(policy->related_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) free_cpumask_var(policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) kfree(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) static int cpufreq_online(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) bool new_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) unsigned int j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) pr_debug("%s: bringing CPU%u online\n", __func__, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) /* Check if this CPU already has a policy to manage it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) policy = per_cpu(cpufreq_cpu_data, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) if (policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) if (!policy_is_inactive(policy))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) return cpufreq_add_policy_cpu(policy, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) /* This is the only online CPU for the policy. Start over. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) new_policy = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) policy->cpu = cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) policy->governor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) new_policy = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) policy = cpufreq_policy_alloc(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) if (!policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) if (!new_policy && cpufreq_driver->online) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) ret = cpufreq_driver->online(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) pr_debug("%s: %d: initialization failed\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) __LINE__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366) goto out_exit_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) /* Recover policy->cpus using related_cpus */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) cpumask_copy(policy->cpus, policy->related_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) cpumask_copy(policy->cpus, cpumask_of(cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) * Call driver. From then on the cpufreq must be able
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) * to accept all calls to ->verify and ->setpolicy for this CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) ret = cpufreq_driver->init(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) pr_debug("%s: %d: initialization failed\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) __LINE__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) goto out_free_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) * The initialization has succeeded and the policy is online.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) * If there is a problem with its frequency table, take it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) * offline and drop it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) ret = cpufreq_table_validate_and_sort(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) goto out_offline_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) /* related_cpus should at least include policy->cpus. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) cpumask_copy(policy->related_cpus, policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) * affected cpus must always be the one, which are online. We aren't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) * managing offline cpus here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) if (new_policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) for_each_cpu(j, policy->related_cpus) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) per_cpu(cpufreq_cpu_data, j) = policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) add_cpu_dev_symlink(policy, j, get_cpu_device(j));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) policy->min_freq_req = kzalloc(2 * sizeof(*policy->min_freq_req),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) if (!policy->min_freq_req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) goto out_destroy_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) ret = freq_qos_add_request(&policy->constraints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) policy->min_freq_req, FREQ_QOS_MIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) FREQ_QOS_MIN_DEFAULT_VALUE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) * So we don't call freq_qos_remove_request() for an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) * uninitialized request.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) kfree(policy->min_freq_req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) policy->min_freq_req = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) goto out_destroy_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) * This must be initialized right here to avoid calling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) * freq_qos_remove_request() on uninitialized request in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) * of errors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) policy->max_freq_req = policy->min_freq_req + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) ret = freq_qos_add_request(&policy->constraints,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) policy->max_freq_req, FREQ_QOS_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) FREQ_QOS_MAX_DEFAULT_VALUE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) policy->max_freq_req = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) goto out_destroy_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) CPUFREQ_CREATE_POLICY, policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) if (cpufreq_driver->get && has_target()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) policy->cur = cpufreq_driver->get(policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) if (!policy->cur) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) pr_err("%s: ->get() failed\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) goto out_destroy_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) * Sometimes boot loaders set CPU frequency to a value outside of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) * frequency table present with cpufreq core. In such cases CPU might be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) * unstable if it has to run on that frequency for long duration of time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) * and so its better to set it to a frequency which is specified in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461) * freq-table. This also makes cpufreq stats inconsistent as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) * cpufreq-stats would fail to register because current frequency of CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) * isn't found in freq-table.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) * Because we don't want this change to effect boot process badly, we go
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) * for the next freq which is >= policy->cur ('cur' must be set by now,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) * otherwise we will end up setting freq to lowest of the table as 'cur'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) * is initialized to zero).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) * We are passing target-freq as "policy->cur - 1" otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) * __cpufreq_driver_target() would simply fail, as policy->cur will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) * equal to target-freq.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) && has_target()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) unsigned int old_freq = policy->cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) /* Are we running at unknown frequency ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) ret = cpufreq_frequency_table_get_index(policy, old_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) if (ret == -EINVAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) ret = __cpufreq_driver_target(policy, old_freq - 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) CPUFREQ_RELATION_L);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) * Reaching here after boot in a few seconds may not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) * mean that system will remain stable at "unknown"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487) * frequency for longer duration. Hence, a BUG_ON().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) BUG_ON(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) pr_info("%s: CPU%d: Running at unlisted initial frequency: %u KHz, changing to: %u KHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) __func__, policy->cpu, old_freq, policy->cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) if (new_policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) ret = cpufreq_add_dev_interface(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) goto out_destroy_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) cpufreq_stats_create_table(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) cpufreq_times_create_policy(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503) write_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) list_add(&policy->policy_list, &cpufreq_policy_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) write_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) ret = cpufreq_init_policy(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) __func__, cpu, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) goto out_destroy_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) kobject_uevent(&policy->kobj, KOBJ_ADD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) /* Callback for handling stuff after policy is ready */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) if (cpufreq_driver->ready)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) cpufreq_driver->ready(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) if (cpufreq_thermal_control_enabled(cpufreq_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) policy->cdev = of_cpufreq_cooling_register(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) pr_debug("initialization complete\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) out_destroy_policy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531) for_each_cpu(j, policy->real_cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) remove_cpu_dev_symlink(policy, get_cpu_device(j));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) out_offline_policy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537) if (cpufreq_driver->offline)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) cpufreq_driver->offline(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) out_exit_policy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) if (cpufreq_driver->exit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) cpufreq_driver->exit(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) out_free_policy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) cpufreq_policy_free(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550) * cpufreq_add_dev - the cpufreq interface for a CPU device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) * @dev: CPU device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) * @sif: Subsystem interface structure pointer (not used)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) unsigned cpu = dev->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) if (cpu_online(cpu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) ret = cpufreq_online(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) /* Create sysfs link on CPU registration */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) policy = per_cpu(cpufreq_cpu_data, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) if (policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) add_cpu_dev_symlink(policy, cpu, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) static int cpufreq_offline(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) pr_debug("%s: unregistering CPU %u\n", __func__, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) policy = cpufreq_cpu_get_raw(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) if (!policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) pr_debug("%s: No cpu_data found\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) if (has_target())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) cpufreq_stop_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) cpumask_clear_cpu(cpu, policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) if (policy_is_inactive(policy)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) if (has_target())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) strncpy(policy->last_governor, policy->governor->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) CPUFREQ_NAME_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) policy->last_policy = policy->policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) } else if (cpu == policy->cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) /* Nominate new CPU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) policy->cpu = cpumask_any(policy->cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) /* Start governor again for active policy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) if (!policy_is_inactive(policy)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) if (has_target()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) ret = cpufreq_start_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) pr_err("%s: Failed to start governor\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617) if (cpufreq_thermal_control_enabled(cpufreq_driver)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) cpufreq_cooling_unregister(policy->cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) policy->cdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) if (cpufreq_driver->stop_cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) cpufreq_driver->stop_cpu(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) if (has_target())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) cpufreq_exit_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) * Perform the ->offline() during light-weight tear-down, as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) * that allows fast recovery when the CPU comes back.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) if (cpufreq_driver->offline) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) cpufreq_driver->offline(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) } else if (cpufreq_driver->exit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) cpufreq_driver->exit(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) policy->freq_table = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645) * cpufreq_remove_dev - remove a CPU device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) * Removes the cpufreq interface for a CPU device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) unsigned int cpu = dev->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) if (!policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) if (cpu_online(cpu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) cpufreq_offline(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) cpumask_clear_cpu(cpu, policy->real_cpus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) remove_cpu_dev_symlink(policy, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663) if (cpumask_empty(policy->real_cpus)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) /* We did light-weight exit earlier, do full tear down now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) if (cpufreq_driver->offline)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) cpufreq_driver->exit(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) cpufreq_policy_free(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) * in deep trouble.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) * @policy: policy managing CPUs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) * @new_freq: CPU frequency the CPU actually runs at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678) * We adjust to current frequency first, and need to clean up later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) * So either call to cpufreq_update_policy() or schedule handle_update()).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) static void cpufreq_out_of_sync(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) unsigned int new_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684) struct cpufreq_freqs freqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) policy->cur, new_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) freqs.old = policy->cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) freqs.new = new_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692) cpufreq_freq_transition_begin(policy, &freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) cpufreq_freq_transition_end(policy, &freqs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) static unsigned int cpufreq_verify_current_freq(struct cpufreq_policy *policy, bool update)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) unsigned int new_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) new_freq = cpufreq_driver->get(policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701) if (!new_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705) * If fast frequency switching is used with the given policy, the check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) * against policy->cur is pointless, so skip it in that case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) if (policy->fast_switch_enabled || !has_target())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) return new_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) if (policy->cur != new_freq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) cpufreq_out_of_sync(policy, new_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) if (update)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) schedule_work(&policy->update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) return new_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) * @cpu: CPU number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) * This is the last known freq, without actually getting it from the driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) * Return value will be same as what is shown in scaling_cur_freq in sysfs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) unsigned int cpufreq_quick_get(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) unsigned int ret_freq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) read_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) ret_freq = cpufreq_driver->get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) read_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) return ret_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) read_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) policy = cpufreq_cpu_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) if (policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) ret_freq = policy->cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) cpufreq_cpu_put(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) return ret_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) EXPORT_SYMBOL(cpufreq_quick_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) * @cpu: CPU number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) * Just return the max possible frequency for a given CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) unsigned int cpufreq_quick_get_max(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) unsigned int ret_freq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) if (policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) ret_freq = policy->max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766) cpufreq_cpu_put(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769) return ret_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) EXPORT_SYMBOL(cpufreq_quick_get_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) * cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) * @cpu: CPU number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) * The default return value is the max_freq field of cpuinfo.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) __weak unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781) struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) unsigned int ret_freq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) if (policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) ret_freq = policy->cpuinfo.max_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) cpufreq_cpu_put(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) return ret_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) EXPORT_SYMBOL(cpufreq_get_hw_max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) if (unlikely(policy_is_inactive(policy)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) return cpufreq_verify_current_freq(policy, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) * cpufreq_get - get the current CPU frequency (in kHz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803) * @cpu: CPU number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) * Get the CPU current (static) CPU frequency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) unsigned int cpufreq_get(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) unsigned int ret_freq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) if (policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) down_read(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) if (cpufreq_driver->get)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) ret_freq = __cpufreq_get(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816) up_read(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) cpufreq_cpu_put(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) return ret_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) EXPORT_SYMBOL(cpufreq_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) static struct subsys_interface cpufreq_interface = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) .name = "cpufreq",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) .subsys = &cpu_subsys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) .add_dev = cpufreq_add_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) .remove_dev = cpufreq_remove_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) * In case platform wants some specific frequency to be configured
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) * during suspend..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) int cpufreq_generic_suspend(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) if (!policy->suspend_freq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841) pr_debug("%s: suspend_freq not defined\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) pr_debug("%s: Setting suspend-freq: %u\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846) policy->suspend_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) ret = __cpufreq_driver_target(policy, policy->suspend_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849) CPUFREQ_RELATION_H);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) pr_err("%s: unable to set suspend-freq: %u. err: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852) __func__, policy->suspend_freq, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) EXPORT_SYMBOL(cpufreq_generic_suspend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) * cpufreq_suspend() - Suspend CPUFreq governors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) * Called during system wide Suspend/Hibernate cycles for suspending governors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) * as some platforms can't change frequency after this point in suspend cycle.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) * Because some of the devices (like: i2c, regulators, etc) they use for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) * changing frequency are suspended quickly after this point.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) void cpufreq_suspend(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) if (!cpufreq_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) if (!has_target() && !cpufreq_driver->suspend)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) goto suspend;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) pr_debug("%s: Suspending Governors\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) for_each_active_policy(policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) if (has_target()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) cpufreq_stop_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) pr_err("%s: Failed to suspend driver: %s\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) cpufreq_driver->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) suspend:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) cpufreq_suspended = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) * cpufreq_resume() - Resume CPUFreq governors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897) * Called during system wide Suspend/Hibernate cycle for resuming governors that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) * are suspended with cpufreq_suspend().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900) void cpufreq_resume(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) if (!cpufreq_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) if (unlikely(!cpufreq_suspended))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) cpufreq_suspended = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913) if (!has_target() && !cpufreq_driver->resume)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916) pr_debug("%s: Resuming Governors\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) for_each_active_policy(policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920) pr_err("%s: Failed to resume driver: %p\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) } else if (has_target()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924) ret = cpufreq_start_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928) pr_err("%s: Failed to start governor for policy: %p\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) __func__, policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935) * cpufreq_driver_test_flags - Test cpufreq driver's flags against given ones.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) * @flags: Flags to test against the current cpufreq driver's flags.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) * Assumes that the driver is there, so callers must ensure that this is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939) * case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) bool cpufreq_driver_test_flags(u16 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) return !!(cpufreq_driver->flags & flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) * cpufreq_get_current_driver - return current driver's name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) * Return the name string of the currently loaded cpufreq driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) * or NULL, if none.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952) const char *cpufreq_get_current_driver(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) if (cpufreq_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) return cpufreq_driver->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959) EXPORT_SYMBOL_GPL(cpufreq_get_current_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) * cpufreq_get_driver_data - return current driver data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964) * Return the private data of the currently loaded cpufreq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) * driver, or NULL if no cpufreq driver is loaded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) void *cpufreq_get_driver_data(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969) if (cpufreq_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970) return cpufreq_driver->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974) EXPORT_SYMBOL_GPL(cpufreq_get_driver_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977) * NOTIFIER LISTS INTERFACE *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981) * cpufreq_register_notifier - register a driver with cpufreq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) * @nb: notifier function to register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1983) * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1984) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1985) * Add a driver to one of two lists: either a list of drivers that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1986) * are notified about clock rate changes (once before and once after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1987) * the transition), or a list of drivers that are notified about
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1988) * changes in cpufreq policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1989) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1990) * This function may sleep, and has the same return conditions as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1991) * blocking_notifier_chain_register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1992) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1993) int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1994) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1995) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1996)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1997) if (cpufreq_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1998) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1999)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2000) switch (list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2001) case CPUFREQ_TRANSITION_NOTIFIER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2002) mutex_lock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2003)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2004) if (cpufreq_fast_switch_count > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2005) mutex_unlock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2006) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2007) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2008) ret = srcu_notifier_chain_register(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2009) &cpufreq_transition_notifier_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2010) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2011) cpufreq_fast_switch_count--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2012)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2013) mutex_unlock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2014) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2015) case CPUFREQ_POLICY_NOTIFIER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2016) ret = blocking_notifier_chain_register(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2017) &cpufreq_policy_notifier_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2018) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2019) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2020) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2021) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2022)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2023) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2024) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2025) EXPORT_SYMBOL(cpufreq_register_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2026)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2027) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2028) * cpufreq_unregister_notifier - unregister a driver with cpufreq
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2029) * @nb: notifier block to be unregistered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2030) * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2031) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2032) * Remove a driver from the CPU frequency notifier list.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2033) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2034) * This function may sleep, and has the same return conditions as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2035) * blocking_notifier_chain_unregister.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2036) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2037) int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2038) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2039) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2040)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2041) if (cpufreq_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2042) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2043)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2044) switch (list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2045) case CPUFREQ_TRANSITION_NOTIFIER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2046) mutex_lock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2047)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2048) ret = srcu_notifier_chain_unregister(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2049) &cpufreq_transition_notifier_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2050) if (!ret && !WARN_ON(cpufreq_fast_switch_count >= 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2051) cpufreq_fast_switch_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2052)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2053) mutex_unlock(&cpufreq_fast_switch_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2054) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2055) case CPUFREQ_POLICY_NOTIFIER:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2056) ret = blocking_notifier_chain_unregister(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2057) &cpufreq_policy_notifier_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2058) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2059) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2060) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2061) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2062)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2063) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2065) EXPORT_SYMBOL(cpufreq_unregister_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2066)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2067)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2068) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2069) * GOVERNORS *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2070) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2071)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2072) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2073) * cpufreq_driver_fast_switch - Carry out a fast CPU frequency switch.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2074) * @policy: cpufreq policy to switch the frequency for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2075) * @target_freq: New frequency to set (may be approximate).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2076) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2077) * Carry out a fast frequency switch without sleeping.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2078) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2079) * The driver's ->fast_switch() callback invoked by this function must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2080) * suitable for being called from within RCU-sched read-side critical sections
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2081) * and it is expected to select the minimum available frequency greater than or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2082) * equal to @target_freq (CPUFREQ_RELATION_L).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2083) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2084) * This function must not be called if policy->fast_switch_enabled is unset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2085) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2086) * Governors calling this function must guarantee that it will never be invoked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2087) * twice in parallel for the same policy and that it will never be called in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2088) * parallel with either ->target() or ->target_index() for the same policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2089) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2090) * Returns the actual frequency set for the CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2091) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2092) * If 0 is returned by the driver's ->fast_switch() callback to indicate an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2093) * error condition, the hardware configuration must be preserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2094) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2095) unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2096) unsigned int target_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2097) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2098) unsigned int freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2099) unsigned int old_target_freq = target_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2100) int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2102) target_freq = clamp_val(target_freq, policy->min, policy->max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2103) trace_android_vh_cpufreq_fast_switch(policy, target_freq, old_target_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2104) freq = cpufreq_driver->fast_switch(policy, target_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2106) if (!freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2107) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2109) policy->cur = freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2110) arch_set_freq_scale(policy->related_cpus, freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2111) policy->cpuinfo.max_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2112) cpufreq_stats_record_transition(policy, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2113) cpufreq_times_record_transition(policy, freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2114) trace_android_rvh_cpufreq_transition(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2116) if (trace_cpu_frequency_enabled()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2117) for_each_cpu(cpu, policy->cpus)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2118) trace_cpu_frequency(freq, cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2121) return freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2123) EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2125) /* Must set freqs->new to intermediate frequency */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2126) static int __target_intermediate(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2127) struct cpufreq_freqs *freqs, int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2129) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2131) freqs->new = cpufreq_driver->get_intermediate(policy, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2133) /* We don't need to switch to intermediate freq */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2134) if (!freqs->new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2135) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2137) pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2138) __func__, policy->cpu, freqs->old, freqs->new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2140) cpufreq_freq_transition_begin(policy, freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2141) ret = cpufreq_driver->target_intermediate(policy, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2142) cpufreq_freq_transition_end(policy, freqs, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2144) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2145) pr_err("%s: Failed to change to intermediate frequency: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2146) __func__, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2148) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2151) static int __target_index(struct cpufreq_policy *policy, int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2152) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2153) struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2154) unsigned int intermediate_freq = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2155) unsigned int newfreq = policy->freq_table[index].frequency;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2156) int retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2157) bool notify;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2159) if (newfreq == policy->cur)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2160) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2162) notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2163) if (notify) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2164) /* Handle switching to intermediate frequency */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2165) if (cpufreq_driver->get_intermediate) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2166) retval = __target_intermediate(policy, &freqs, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2167) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2168) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2170) intermediate_freq = freqs.new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2171) /* Set old freq to intermediate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2172) if (intermediate_freq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2173) freqs.old = freqs.new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2176) freqs.new = newfreq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2177) pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2178) __func__, policy->cpu, freqs.old, freqs.new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2180) cpufreq_freq_transition_begin(policy, &freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2183) retval = cpufreq_driver->target_index(policy, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2184) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2185) pr_err("%s: Failed to change cpu frequency: %d\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2186) retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2188) if (notify) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2189) cpufreq_freq_transition_end(policy, &freqs, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2191) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2192) * Failed after setting to intermediate freq? Driver should have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2193) * reverted back to initial frequency and so should we. Check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2194) * here for intermediate_freq instead of get_intermediate, in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2195) * case we haven't switched to intermediate freq at all.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2196) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2197) if (unlikely(retval && intermediate_freq)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2198) freqs.old = intermediate_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2199) freqs.new = policy->restore_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2200) cpufreq_freq_transition_begin(policy, &freqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2201) cpufreq_freq_transition_end(policy, &freqs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2205) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2208) int __cpufreq_driver_target(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2209) unsigned int target_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2210) unsigned int relation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2212) unsigned int old_target_freq = target_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2213) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2215) if (cpufreq_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2216) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2218) /* Make sure that target_freq is within supported range */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2219) target_freq = clamp_val(target_freq, policy->min, policy->max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2220) trace_android_vh_cpufreq_target(policy, target_freq, old_target_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2222) pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2223) policy->cpu, target_freq, relation, old_target_freq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2225) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2226) * This might look like a redundant call as we are checking it again
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2227) * after finding index. But it is left intentionally for cases where
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2228) * exactly same freq is called again and so we can save on few function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2229) * calls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2230) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2231) if (target_freq == policy->cur &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2232) !(cpufreq_driver->flags & CPUFREQ_NEED_UPDATE_LIMITS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2233) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2235) /* Save last value to restore later on errors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2236) policy->restore_freq = policy->cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2238) if (cpufreq_driver->target)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2239) return cpufreq_driver->target(policy, target_freq, relation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2241) if (!cpufreq_driver->target_index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2242) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2244) index = cpufreq_frequency_table_target(policy, target_freq, relation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2246) return __target_index(policy, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2248) EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2250) int cpufreq_driver_target(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2251) unsigned int target_freq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2252) unsigned int relation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2253) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2254) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2256) down_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2258) ret = __cpufreq_driver_target(policy, target_freq, relation);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2260) up_write(&policy->rwsem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2262) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2264) EXPORT_SYMBOL_GPL(cpufreq_driver_target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2266) __weak struct cpufreq_governor *cpufreq_fallback_governor(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2268) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2271) static int cpufreq_init_governor(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2273) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2275) /* Don't start any governor operations if we are entering suspend */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2276) if (cpufreq_suspended)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2277) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2278) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2279) * Governor might not be initiated here if ACPI _PPC changed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2280) * notification happened, so check it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2281) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2282) if (!policy->governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2283) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2285) /* Platform doesn't want dynamic frequency switching ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2286) if (policy->governor->flags & CPUFREQ_GOV_DYNAMIC_SWITCHING &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2287) cpufreq_driver->flags & CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2288) struct cpufreq_governor *gov = cpufreq_fallback_governor();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2290) if (gov) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2291) pr_warn("Can't use %s governor as dynamic switching is disallowed. Fallback to %s governor\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2292) policy->governor->name, gov->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2293) policy->governor = gov;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2294) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2295) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2299) if (!try_module_get(policy->governor->owner))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2300) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2302) pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2304) if (policy->governor->init) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2305) ret = policy->governor->init(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2306) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2307) module_put(policy->governor->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2308) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2312) policy->strict_target = !!(policy->governor->flags & CPUFREQ_GOV_STRICT_TARGET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2314) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2317) static void cpufreq_exit_governor(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2319) if (cpufreq_suspended || !policy->governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2320) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2322) pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2324) if (policy->governor->exit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2325) policy->governor->exit(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2327) module_put(policy->governor->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2330) int cpufreq_start_governor(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2332) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2334) if (cpufreq_suspended)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2335) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2337) if (!policy->governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2338) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2340) pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2342) if (cpufreq_driver->get)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2343) cpufreq_verify_current_freq(policy, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2345) if (policy->governor->start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2346) ret = policy->governor->start(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2347) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2348) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2351) if (policy->governor->limits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2352) policy->governor->limits(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2354) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2357) void cpufreq_stop_governor(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2358) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2359) if (cpufreq_suspended || !policy->governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2360) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2362) pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2364) if (policy->governor->stop)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2365) policy->governor->stop(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2368) static void cpufreq_governor_limits(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2370) if (cpufreq_suspended || !policy->governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2371) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2373) pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2375) if (policy->governor->limits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2376) policy->governor->limits(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2379) int cpufreq_register_governor(struct cpufreq_governor *governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2381) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2383) if (!governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2384) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2386) if (cpufreq_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2387) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2389) mutex_lock(&cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2391) err = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2392) if (!find_governor(governor->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2393) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2394) list_add(&governor->governor_list, &cpufreq_governor_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2397) mutex_unlock(&cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2398) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2400) EXPORT_SYMBOL_GPL(cpufreq_register_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2402) void cpufreq_unregister_governor(struct cpufreq_governor *governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2403) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2404) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2405) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2407) if (!governor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2408) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2410) if (cpufreq_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2411) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2413) /* clear last_governor for all inactive policies */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2414) read_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2415) for_each_inactive_policy(policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2416) if (!strcmp(policy->last_governor, governor->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2417) policy->governor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2418) strcpy(policy->last_governor, "\0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2419) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2421) read_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2423) mutex_lock(&cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2424) list_del(&governor->governor_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2425) mutex_unlock(&cpufreq_governor_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2427) EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2430) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2431) * POLICY INTERFACE *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2432) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2434) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2435) * cpufreq_get_policy - get the current cpufreq_policy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2436) * @policy: struct cpufreq_policy into which the current cpufreq_policy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2437) * is written
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2438) * @cpu: CPU to find the policy for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2439) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2440) * Reads the current cpufreq policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2441) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2442) int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2443) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2444) struct cpufreq_policy *cpu_policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2445) if (!policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2446) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2448) cpu_policy = cpufreq_cpu_get(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2449) if (!cpu_policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2450) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2452) memcpy(policy, cpu_policy, sizeof(*policy));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2454) cpufreq_cpu_put(cpu_policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2455) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2457) EXPORT_SYMBOL(cpufreq_get_policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2459) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2460) * cpufreq_set_policy - Modify cpufreq policy parameters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2461) * @policy: Policy object to modify.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2462) * @new_gov: Policy governor pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2463) * @new_pol: Policy value (for drivers with built-in governors).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2464) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2465) * Invoke the cpufreq driver's ->verify() callback to sanity-check the frequency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2466) * limits to be set for the policy, update @policy with the verified limits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2467) * values and either invoke the driver's ->setpolicy() callback (if present) or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2468) * carry out a governor update for @policy. That is, run the current governor's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2469) * ->limits() callback (if @new_gov points to the same object as the one in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2470) * @policy) or replace the governor for @policy with @new_gov.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2471) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2472) * The cpuinfo part of @policy is not updated by this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2473) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2474) static int cpufreq_set_policy(struct cpufreq_policy *policy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2475) struct cpufreq_governor *new_gov,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2476) unsigned int new_pol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2477) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2478) struct cpufreq_policy_data new_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2479) struct cpufreq_governor *old_gov;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2480) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2482) memcpy(&new_data.cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2483) new_data.freq_table = policy->freq_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2484) new_data.cpu = policy->cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2485) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2486) * PM QoS framework collects all the requests from users and provide us
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2487) * the final aggregated value here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2488) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2489) new_data.min = freq_qos_read_value(&policy->constraints, FREQ_QOS_MIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2490) new_data.max = freq_qos_read_value(&policy->constraints, FREQ_QOS_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2492) pr_debug("setting new policy for CPU %u: %u - %u kHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2493) new_data.cpu, new_data.min, new_data.max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2495) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2496) * Verify that the CPU speed can be set within these limits and make sure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2497) * that min <= max.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2498) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2499) ret = cpufreq_driver->verify(&new_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2500) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2501) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2503) policy->min = new_data.min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2504) policy->max = new_data.max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2505) trace_cpu_frequency_limits(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2507) policy->cached_target_freq = UINT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2508)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2509) pr_debug("new min and max freqs are %u - %u kHz\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2510) policy->min, policy->max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2512) if (cpufreq_driver->setpolicy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2513) policy->policy = new_pol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2514) pr_debug("setting range\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2515) return cpufreq_driver->setpolicy(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2518) if (new_gov == policy->governor) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2519) pr_debug("governor limits update\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2520) cpufreq_governor_limits(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2521) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2524) pr_debug("governor switch\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2526) /* save old, working values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2527) old_gov = policy->governor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2528) /* end old governor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2529) if (old_gov) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2530) cpufreq_stop_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2531) cpufreq_exit_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2532) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2534) /* start new governor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2535) policy->governor = new_gov;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2536) ret = cpufreq_init_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2537) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2538) ret = cpufreq_start_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2539) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2540) pr_debug("governor change\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2541) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2543) cpufreq_exit_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2546) /* new governor failed, so re-start old one */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2547) pr_debug("starting governor %s failed\n", policy->governor->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2548) if (old_gov) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2549) policy->governor = old_gov;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2550) if (cpufreq_init_governor(policy))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2551) policy->governor = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2552) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2553) cpufreq_start_governor(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2556) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2558) EXPORT_TRACEPOINT_SYMBOL_GPL(cpu_frequency_limits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2560) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2561) * cpufreq_update_policy - Re-evaluate an existing cpufreq policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2562) * @cpu: CPU to re-evaluate the policy for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2563) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2564) * Update the current frequency for the cpufreq policy of @cpu and use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2565) * cpufreq_set_policy() to re-apply the min and max limits, which triggers the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2566) * evaluation of policy notifiers and the cpufreq driver's ->verify() callback
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2567) * for the policy in question, among other things.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2568) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2569) void cpufreq_update_policy(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2570) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2571) struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2573) if (!policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2574) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2576) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2577) * BIOS might change freq behind our back
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2578) * -> ask driver for current freq and notify governors about a change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2579) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2580) if (cpufreq_driver->get && has_target() &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2581) (cpufreq_suspended || WARN_ON(!cpufreq_verify_current_freq(policy, false))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2582) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2584) refresh_frequency_limits(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2585)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2586) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2587) cpufreq_cpu_release(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2589) EXPORT_SYMBOL(cpufreq_update_policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2591) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2592) * cpufreq_update_limits - Update policy limits for a given CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2593) * @cpu: CPU to update the policy limits for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2594) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2595) * Invoke the driver's ->update_limits callback if present or call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2596) * cpufreq_update_policy() for @cpu.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2597) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2598) void cpufreq_update_limits(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2599) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2600) if (cpufreq_driver->update_limits)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2601) cpufreq_driver->update_limits(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2602) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2603) cpufreq_update_policy(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2605) EXPORT_SYMBOL_GPL(cpufreq_update_limits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2607) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2608) * BOOST *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2609) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2610) static int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2611) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2612) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2614) if (!policy->freq_table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2615) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2617) ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2618) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2619) pr_err("%s: Policy frequency update failed\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2620) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2623) ret = freq_qos_update_request(policy->max_freq_req, policy->max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2624) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2625) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2627) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2630) int cpufreq_boost_trigger_state(int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2631) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2632) struct cpufreq_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2633) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2634) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2636) if (cpufreq_driver->boost_enabled == state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2637) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2639) write_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2640) cpufreq_driver->boost_enabled = state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2641) write_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2643) get_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2644) for_each_active_policy(policy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2645) ret = cpufreq_driver->set_boost(policy, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2646) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2647) goto err_reset_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2648) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2649) put_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2651) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2653) err_reset_state:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2654) put_online_cpus();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2656) write_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2657) cpufreq_driver->boost_enabled = !state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2658) write_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2660) pr_err("%s: Cannot %s BOOST\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2661) __func__, state ? "enable" : "disable");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2663) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2664) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2666) static bool cpufreq_boost_supported(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2667) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2668) return cpufreq_driver->set_boost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2669) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2671) static int create_boost_sysfs_file(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2672) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2673) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2675) ret = sysfs_create_file(cpufreq_global_kobject, &boost.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2676) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2677) pr_err("%s: cannot register global BOOST sysfs file\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2678) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2679)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2680) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2681) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2683) static void remove_boost_sysfs_file(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2684) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2685) if (cpufreq_boost_supported())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2686) sysfs_remove_file(cpufreq_global_kobject, &boost.attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2687) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2689) int cpufreq_enable_boost_support(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2690) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2691) if (!cpufreq_driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2692) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2694) if (cpufreq_boost_supported())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2695) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2697) cpufreq_driver->set_boost = cpufreq_boost_set_sw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2699) /* This will get removed on driver unregister */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2700) return create_boost_sysfs_file();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2701) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2702) EXPORT_SYMBOL_GPL(cpufreq_enable_boost_support);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2704) int cpufreq_boost_enabled(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2705) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2706) return cpufreq_driver->boost_enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2707) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2708) EXPORT_SYMBOL_GPL(cpufreq_boost_enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2710) /*********************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2711) * REGISTER / UNREGISTER CPUFREQ DRIVER *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2712) *********************************************************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2713) static enum cpuhp_state hp_online;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2714)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2715) static int cpuhp_cpufreq_online(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2716) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2717) cpufreq_online(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2719) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2720) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2722) static int cpuhp_cpufreq_offline(unsigned int cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2723) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2724) cpufreq_offline(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2726) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2727) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2729) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2730) * cpufreq_register_driver - register a CPU Frequency driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2731) * @driver_data: A struct cpufreq_driver containing the values#
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2732) * submitted by the CPU Frequency driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2733) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2734) * Registers a CPU Frequency driver to this core code. This code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2735) * returns zero on success, -EEXIST when another driver got here first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2736) * (and isn't unregistered in the meantime).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2737) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2738) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2739) int cpufreq_register_driver(struct cpufreq_driver *driver_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2740) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2741) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2742) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2744) if (cpufreq_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2745) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2747) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2748) * The cpufreq core depends heavily on the availability of device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2749) * structure, make sure they are available before proceeding further.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2750) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2751) if (!get_cpu_device(0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2752) return -EPROBE_DEFER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2754) if (!driver_data || !driver_data->verify || !driver_data->init ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2755) !(driver_data->setpolicy || driver_data->target_index ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2756) driver_data->target) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2757) (driver_data->setpolicy && (driver_data->target_index ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2758) driver_data->target)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2759) (!driver_data->get_intermediate != !driver_data->target_intermediate) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2760) (!driver_data->online != !driver_data->offline))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2761) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2763) pr_debug("trying to register driver %s\n", driver_data->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2764)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2765) /* Protect against concurrent CPU online/offline. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2766) cpus_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2767)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2768) write_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2769) if (cpufreq_driver) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2770) write_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2771) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2772) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2774) cpufreq_driver = driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2775) write_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2777) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2778) * Mark support for the scheduler's frequency invariance engine for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2779) * drivers that implement target(), target_index() or fast_switch().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2780) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2781) if (!cpufreq_driver->setpolicy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2782) static_branch_enable_cpuslocked(&cpufreq_freq_invariance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2783) pr_debug("supports frequency invariance");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2784) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2785)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2786) if (driver_data->setpolicy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2787) driver_data->flags |= CPUFREQ_CONST_LOOPS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2788)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2789) if (cpufreq_boost_supported()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2790) ret = create_boost_sysfs_file();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2791) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2792) goto err_null_driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2795) ret = subsys_interface_register(&cpufreq_interface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2796) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2797) goto err_boost_unreg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2799) if (!(cpufreq_driver->flags & CPUFREQ_STICKY) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2800) list_empty(&cpufreq_policy_list)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2801) /* if all ->init() calls failed, unregister */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2802) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2803) pr_debug("%s: No CPU initialized for driver %s\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2804) driver_data->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2805) goto err_if_unreg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2806) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2807)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2808) ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2809) "cpufreq:online",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2810) cpuhp_cpufreq_online,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2811) cpuhp_cpufreq_offline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2812) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2813) goto err_if_unreg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2814) hp_online = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2815) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2817) pr_debug("driver %s up and running\n", driver_data->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2818) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2819)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2820) err_if_unreg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2821) subsys_interface_unregister(&cpufreq_interface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2822) err_boost_unreg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2823) remove_boost_sysfs_file();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2824) err_null_driver:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2825) write_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2826) cpufreq_driver = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2827) write_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2828) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2829) cpus_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2830) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2831) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2832) EXPORT_SYMBOL_GPL(cpufreq_register_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2833)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2834) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2835) * cpufreq_unregister_driver - unregister the current CPUFreq driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2836) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2837) * Unregister the current CPUFreq driver. Only call this if you have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2838) * the right to do so, i.e. if you have succeeded in initialising before!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2839) * Returns zero if successful, and -EINVAL if the cpufreq_driver is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2840) * currently not initialised.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2841) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2842) int cpufreq_unregister_driver(struct cpufreq_driver *driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2843) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2844) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2846) if (!cpufreq_driver || (driver != cpufreq_driver))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2847) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2848)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2849) pr_debug("unregistering driver %s\n", driver->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2850)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2851) /* Protect against concurrent cpu hotplug */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2852) cpus_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2853) subsys_interface_unregister(&cpufreq_interface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2854) remove_boost_sysfs_file();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2855) static_branch_disable_cpuslocked(&cpufreq_freq_invariance);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2856) cpuhp_remove_state_nocalls_cpuslocked(hp_online);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2858) write_lock_irqsave(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2860) cpufreq_driver = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2861)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2862) write_unlock_irqrestore(&cpufreq_driver_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2863) cpus_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2865) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2866) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2867) EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2869) static int __init cpufreq_core_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2870) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2871) struct cpufreq_governor *gov = cpufreq_default_governor();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2872)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2873) if (cpufreq_disabled())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2874) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2876) cpufreq_global_kobject = kobject_create_and_add("cpufreq", &cpu_subsys.dev_root->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2877) BUG_ON(!cpufreq_global_kobject);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2879) if (!strlen(default_governor))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2880) strncpy(default_governor, gov->name, CPUFREQ_NAME_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2881)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2882) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2883) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2884) module_param(off, int, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2885) module_param_string(default_governor, default_governor, CPUFREQ_NAME_LEN, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2886) core_initcall(cpufreq_core_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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