| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * linux/include/linux/cpufreq.h |
| * |
| * Copyright (C) 2001 Russell King |
| * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> |
| */ |
| #ifndef _LINUX_CPUFREQ_H |
| #define _LINUX_CPUFREQ_H |
| |
| #include <linux/clk.h> |
| #include <linux/cpu.h> |
| #include <linux/cpumask.h> |
| #include <linux/completion.h> |
| #include <linux/kobject.h> |
| #include <linux/notifier.h> |
| #include <linux/of.h> |
| #include <linux/pm_opp.h> |
| #include <linux/pm_qos.h> |
| #include <linux/spinlock.h> |
| #include <linux/sysfs.h> |
| #include <linux/minmax.h> |
| |
| /********************************************************************* |
| * CPUFREQ INTERFACE * |
| *********************************************************************/ |
| /* |
| * Frequency values here are CPU kHz |
| * |
| * Maximum transition latency is in nanoseconds - if it's unknown, |
| * CPUFREQ_ETERNAL shall be used. |
| */ |
| |
| #define CPUFREQ_ETERNAL (-1) |
| #define CPUFREQ_NAME_LEN 16 |
| /* Print length for names. Extra 1 space for accommodating '\n' in prints */ |
| #define CPUFREQ_NAME_PLEN (CPUFREQ_NAME_LEN + 1) |
| |
| struct cpufreq_governor; |
| |
| enum cpufreq_table_sorting { |
| CPUFREQ_TABLE_UNSORTED, |
| CPUFREQ_TABLE_SORTED_ASCENDING, |
| CPUFREQ_TABLE_SORTED_DESCENDING |
| }; |
| |
| struct cpufreq_cpuinfo { |
| unsigned int max_freq; |
| unsigned int min_freq; |
| |
| /* in 10^(-9) s = nanoseconds */ |
| unsigned int transition_latency; |
| }; |
| |
| struct cpufreq_policy { |
| /* CPUs sharing clock, require sw coordination */ |
| cpumask_var_t cpus; /* Online CPUs only */ |
| cpumask_var_t related_cpus; /* Online + Offline CPUs */ |
| cpumask_var_t real_cpus; /* Related and present */ |
| |
| unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs |
| should set cpufreq */ |
| unsigned int cpu; /* cpu managing this policy, must be online */ |
| |
| struct clk *clk; |
| struct cpufreq_cpuinfo cpuinfo;/* see above */ |
| |
| unsigned int min; /* in kHz */ |
| unsigned int max; /* in kHz */ |
| unsigned int cur; /* in kHz, only needed if cpufreq |
| * governors are used */ |
| unsigned int suspend_freq; /* freq to set during suspend */ |
| |
| unsigned int policy; /* see above */ |
| unsigned int last_policy; /* policy before unplug */ |
| struct cpufreq_governor *governor; /* see below */ |
| void *governor_data; |
| char last_governor[CPUFREQ_NAME_LEN]; /* last governor used */ |
| |
| struct work_struct update; /* if update_policy() needs to be |
| * called, but you're in IRQ context */ |
| |
| struct freq_constraints constraints; |
| struct freq_qos_request *min_freq_req; |
| struct freq_qos_request *max_freq_req; |
| |
| struct cpufreq_frequency_table *freq_table; |
| enum cpufreq_table_sorting freq_table_sorted; |
| |
| struct list_head policy_list; |
| struct kobject kobj; |
| struct completion kobj_unregister; |
| |
| /* |
| * The rules for this semaphore: |
| * - Any routine that wants to read from the policy structure will |
| * do a down_read on this semaphore. |
| * - Any routine that will write to the policy structure and/or may take away |
| * the policy altogether (eg. CPU hotplug), will hold this lock in write |
| * mode before doing so. |
| */ |
| struct rw_semaphore rwsem; |
| |
| /* |
| * Fast switch flags: |
| * - fast_switch_possible should be set by the driver if it can |
| * guarantee that frequency can be changed on any CPU sharing the |
| * policy and that the change will affect all of the policy CPUs then. |
| * - fast_switch_enabled is to be set by governors that support fast |
| * frequency switching with the help of cpufreq_enable_fast_switch(). |
| */ |
| bool fast_switch_possible; |
| bool fast_switch_enabled; |
| |
| /* |
| * Set if the CPUFREQ_GOV_STRICT_TARGET flag is set for the current |
| * governor. |
| */ |
| bool strict_target; |
| |
| /* |
| * Set if inefficient frequencies were found in the frequency table. |
| * This indicates if the relation flag CPUFREQ_RELATION_E can be |
| * honored. |
| */ |
| bool efficiencies_available; |
| |
| /* |
| * Preferred average time interval between consecutive invocations of |
| * the driver to set the frequency for this policy. To be set by the |
| * scaling driver (0, which is the default, means no preference). |
| */ |
| unsigned int transition_delay_us; |
| |
| /* |
| * Remote DVFS flag (Not added to the driver structure as we don't want |
| * to access another structure from scheduler hotpath). |
| * |
| * Should be set if CPUs can do DVFS on behalf of other CPUs from |
| * different cpufreq policies. |
| */ |
| bool dvfs_possible_from_any_cpu; |
| |
| /* Per policy boost enabled flag. */ |
| bool boost_enabled; |
| |
| /* Cached frequency lookup from cpufreq_driver_resolve_freq. */ |
| unsigned int cached_target_freq; |
| unsigned int cached_resolved_idx; |
| |
| /* Synchronization for frequency transitions */ |
| bool transition_ongoing; /* Tracks transition status */ |
| spinlock_t transition_lock; |
| wait_queue_head_t transition_wait; |
| struct task_struct *transition_task; /* Task which is doing the transition */ |
| |
| /* cpufreq-stats */ |
| struct cpufreq_stats *stats; |
| |
| /* For cpufreq driver's internal use */ |
| void *driver_data; |
| |
| /* Pointer to the cooling device if used for thermal mitigation */ |
| struct thermal_cooling_device *cdev; |
| |
| struct notifier_block nb_min; |
| struct notifier_block nb_max; |
| }; |
| |
| /* |
| * Used for passing new cpufreq policy data to the cpufreq driver's ->verify() |
| * callback for sanitization. That callback is only expected to modify the min |
| * and max values, if necessary, and specifically it must not update the |
| * frequency table. |
| */ |
| struct cpufreq_policy_data { |
| struct cpufreq_cpuinfo cpuinfo; |
| struct cpufreq_frequency_table *freq_table; |
| unsigned int cpu; |
| unsigned int min; /* in kHz */ |
| unsigned int max; /* in kHz */ |
| }; |
| |
| struct cpufreq_freqs { |
| struct cpufreq_policy *policy; |
| unsigned int old; |
| unsigned int new; |
| u8 flags; /* flags of cpufreq_driver, see below. */ |
| }; |
| |
| /* Only for ACPI */ |
| #define CPUFREQ_SHARED_TYPE_NONE (0) /* None */ |
| #define CPUFREQ_SHARED_TYPE_HW (1) /* HW does needed coordination */ |
| #define CPUFREQ_SHARED_TYPE_ALL (2) /* All dependent CPUs should set freq */ |
| #define CPUFREQ_SHARED_TYPE_ANY (3) /* Freq can be set from any dependent CPU*/ |
| |
| #ifdef CONFIG_CPU_FREQ |
| struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu); |
| struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu); |
| void cpufreq_cpu_put(struct cpufreq_policy *policy); |
| #else |
| static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu) |
| { |
| return NULL; |
| } |
| static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) |
| { |
| return NULL; |
| } |
| static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { } |
| #endif |
| |
| static inline bool policy_is_inactive(struct cpufreq_policy *policy) |
| { |
| return cpumask_empty(policy->cpus); |
| } |
| |
| static inline bool policy_is_shared(struct cpufreq_policy *policy) |
| { |
| return cpumask_weight(policy->cpus) > 1; |
| } |
| |
| #ifdef CONFIG_CPU_FREQ |
| unsigned int cpufreq_get(unsigned int cpu); |
| unsigned int cpufreq_quick_get(unsigned int cpu); |
| unsigned int cpufreq_quick_get_max(unsigned int cpu); |
| unsigned int cpufreq_get_hw_max_freq(unsigned int cpu); |
| void disable_cpufreq(void); |
| |
| u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy); |
| |
| struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu); |
| void cpufreq_cpu_release(struct cpufreq_policy *policy); |
| int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu); |
| void refresh_frequency_limits(struct cpufreq_policy *policy); |
| void cpufreq_update_policy(unsigned int cpu); |
| void cpufreq_update_limits(unsigned int cpu); |
| bool have_governor_per_policy(void); |
| bool cpufreq_supports_freq_invariance(void); |
| struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy); |
| void cpufreq_enable_fast_switch(struct cpufreq_policy *policy); |
| void cpufreq_disable_fast_switch(struct cpufreq_policy *policy); |
| bool has_target_index(void); |
| |
| DECLARE_PER_CPU(unsigned long, cpufreq_pressure); |
| static inline unsigned long cpufreq_get_pressure(int cpu) |
| { |
| return READ_ONCE(per_cpu(cpufreq_pressure, cpu)); |
| } |
| #else |
| static inline unsigned int cpufreq_get(unsigned int cpu) |
| { |
| return 0; |
| } |
| static inline unsigned int cpufreq_quick_get(unsigned int cpu) |
| { |
| return 0; |
| } |
| static inline unsigned int cpufreq_quick_get_max(unsigned int cpu) |
| { |
| return 0; |
| } |
| static inline unsigned int cpufreq_get_hw_max_freq(unsigned int cpu) |
| { |
| return 0; |
| } |
| static inline bool cpufreq_supports_freq_invariance(void) |
| { |
| return false; |
| } |
| static inline void disable_cpufreq(void) { } |
| static inline void cpufreq_update_limits(unsigned int cpu) { } |
| static inline unsigned long cpufreq_get_pressure(int cpu) |
| { |
| return 0; |
| } |
| #endif |
| |
| #ifdef CONFIG_CPU_FREQ_STAT |
| void cpufreq_stats_create_table(struct cpufreq_policy *policy); |
| void cpufreq_stats_free_table(struct cpufreq_policy *policy); |
| void cpufreq_stats_record_transition(struct cpufreq_policy *policy, |
| unsigned int new_freq); |
| #else |
| static inline void cpufreq_stats_create_table(struct cpufreq_policy *policy) { } |
| static inline void cpufreq_stats_free_table(struct cpufreq_policy *policy) { } |
| static inline void cpufreq_stats_record_transition(struct cpufreq_policy *policy, |
| unsigned int new_freq) { } |
| #endif /* CONFIG_CPU_FREQ_STAT */ |
| |
| /********************************************************************* |
| * CPUFREQ DRIVER INTERFACE * |
| *********************************************************************/ |
| |
| #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ |
| #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ |
| #define CPUFREQ_RELATION_C 2 /* closest frequency to target */ |
| /* relation flags */ |
| #define CPUFREQ_RELATION_E BIT(2) /* Get if possible an efficient frequency */ |
| |
| #define CPUFREQ_RELATION_LE (CPUFREQ_RELATION_L | CPUFREQ_RELATION_E) |
| #define CPUFREQ_RELATION_HE (CPUFREQ_RELATION_H | CPUFREQ_RELATION_E) |
| #define CPUFREQ_RELATION_CE (CPUFREQ_RELATION_C | CPUFREQ_RELATION_E) |
| |
| struct freq_attr { |
| struct attribute attr; |
| ssize_t (*show)(struct cpufreq_policy *, char *); |
| ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count); |
| }; |
| |
| #define cpufreq_freq_attr_ro(_name) \ |
| static struct freq_attr _name = \ |
| __ATTR(_name, 0444, show_##_name, NULL) |
| |
| #define cpufreq_freq_attr_ro_perm(_name, _perm) \ |
| static struct freq_attr _name = \ |
| __ATTR(_name, _perm, show_##_name, NULL) |
| |
| #define cpufreq_freq_attr_rw(_name) \ |
| static struct freq_attr _name = \ |
| __ATTR(_name, 0644, show_##_name, store_##_name) |
| |
| #define cpufreq_freq_attr_wo(_name) \ |
| static struct freq_attr _name = \ |
| __ATTR(_name, 0200, NULL, store_##_name) |
| |
| #define define_one_global_ro(_name) \ |
| static struct kobj_attribute _name = \ |
| __ATTR(_name, 0444, show_##_name, NULL) |
| |
| #define define_one_global_rw(_name) \ |
| static struct kobj_attribute _name = \ |
| __ATTR(_name, 0644, show_##_name, store_##_name) |
| |
| |
| struct cpufreq_driver { |
| char name[CPUFREQ_NAME_LEN]; |
| u16 flags; |
| void *driver_data; |
| |
| /* needed by all drivers */ |
| int (*init)(struct cpufreq_policy *policy); |
| int (*verify)(struct cpufreq_policy_data *policy); |
| |
| /* define one out of two */ |
| int (*setpolicy)(struct cpufreq_policy *policy); |
| |
| int (*target)(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| unsigned int relation); /* Deprecated */ |
| int (*target_index)(struct cpufreq_policy *policy, |
| unsigned int index); |
| unsigned int (*fast_switch)(struct cpufreq_policy *policy, |
| unsigned int target_freq); |
| /* |
| * ->fast_switch() replacement for drivers that use an internal |
| * representation of performance levels and can pass hints other than |
| * the target performance level to the hardware. This can only be set |
| * if ->fast_switch is set too, because in those cases (under specific |
| * conditions) scale invariance can be disabled, which causes the |
| * schedutil governor to fall back to the latter. |
| */ |
| void (*adjust_perf)(unsigned int cpu, |
| unsigned long min_perf, |
| unsigned long target_perf, |
| unsigned long capacity); |
| |
| /* |
| * Only for drivers with target_index() and CPUFREQ_ASYNC_NOTIFICATION |
| * unset. |
| * |
| * get_intermediate should return a stable intermediate frequency |
| * platform wants to switch to and target_intermediate() should set CPU |
| * to that frequency, before jumping to the frequency corresponding |
| * to 'index'. Core will take care of sending notifications and driver |
| * doesn't have to handle them in target_intermediate() or |
| * target_index(). |
| * |
| * Drivers can return '0' from get_intermediate() in case they don't |
| * wish to switch to intermediate frequency for some target frequency. |
| * In that case core will directly call ->target_index(). |
| */ |
| unsigned int (*get_intermediate)(struct cpufreq_policy *policy, |
| unsigned int index); |
| int (*target_intermediate)(struct cpufreq_policy *policy, |
| unsigned int index); |
| |
| /* should be defined, if possible, return 0 on error */ |
| unsigned int (*get)(unsigned int cpu); |
| |
| /* Called to update policy limits on firmware notifications. */ |
| void (*update_limits)(unsigned int cpu); |
| |
| /* optional */ |
| int (*bios_limit)(int cpu, unsigned int *limit); |
| |
| int (*online)(struct cpufreq_policy *policy); |
| int (*offline)(struct cpufreq_policy *policy); |
| void (*exit)(struct cpufreq_policy *policy); |
| int (*suspend)(struct cpufreq_policy *policy); |
| int (*resume)(struct cpufreq_policy *policy); |
| |
| /* Will be called after the driver is fully initialized */ |
| void (*ready)(struct cpufreq_policy *policy); |
| |
| struct freq_attr **attr; |
| |
| /* platform specific boost support code */ |
| bool boost_enabled; |
| int (*set_boost)(struct cpufreq_policy *policy, int state); |
| |
| /* |
| * Set by drivers that want to register with the energy model after the |
| * policy is properly initialized, but before the governor is started. |
| */ |
| void (*register_em)(struct cpufreq_policy *policy); |
| }; |
| |
| /* flags */ |
| |
| /* |
| * Set by drivers that need to update internal upper and lower boundaries along |
| * with the target frequency and so the core and governors should also invoke |
| * the diver if the target frequency does not change, but the policy min or max |
| * may have changed. |
| */ |
| #define CPUFREQ_NEED_UPDATE_LIMITS BIT(0) |
| |
| /* loops_per_jiffy or other kernel "constants" aren't affected by frequency transitions */ |
| #define CPUFREQ_CONST_LOOPS BIT(1) |
| |
| /* |
| * Set by drivers that want the core to automatically register the cpufreq |
| * driver as a thermal cooling device. |
| */ |
| #define CPUFREQ_IS_COOLING_DEV BIT(2) |
| |
| /* |
| * This should be set by platforms having multiple clock-domains, i.e. |
| * supporting multiple policies. With this sysfs directories of governor would |
| * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same |
| * governor with different tunables for different clusters. |
| */ |
| #define CPUFREQ_HAVE_GOVERNOR_PER_POLICY BIT(3) |
| |
| /* |
| * Driver will do POSTCHANGE notifications from outside of their ->target() |
| * routine and so must set cpufreq_driver->flags with this flag, so that core |
| * can handle them specially. |
| */ |
| #define CPUFREQ_ASYNC_NOTIFICATION BIT(4) |
| |
| /* |
| * Set by drivers which want cpufreq core to check if CPU is running at a |
| * frequency present in freq-table exposed by the driver. For these drivers if |
| * CPU is found running at an out of table freq, we will try to set it to a freq |
| * from the table. And if that fails, we will stop further boot process by |
| * issuing a BUG_ON(). |
| */ |
| #define CPUFREQ_NEED_INITIAL_FREQ_CHECK BIT(5) |
| |
| /* |
| * Set by drivers to disallow use of governors with "dynamic_switching" flag |
| * set. |
| */ |
| #define CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING BIT(6) |
| |
| int cpufreq_register_driver(struct cpufreq_driver *driver_data); |
| void cpufreq_unregister_driver(struct cpufreq_driver *driver_data); |
| |
| bool cpufreq_driver_test_flags(u16 flags); |
| const char *cpufreq_get_current_driver(void); |
| void *cpufreq_get_driver_data(void); |
| |
| static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv) |
| { |
| return IS_ENABLED(CONFIG_CPU_THERMAL) && |
| (drv->flags & CPUFREQ_IS_COOLING_DEV); |
| } |
| |
| static inline void cpufreq_verify_within_limits(struct cpufreq_policy_data *policy, |
| unsigned int min, |
| unsigned int max) |
| { |
| policy->max = clamp(policy->max, min, max); |
| policy->min = clamp(policy->min, min, policy->max); |
| } |
| |
| static inline void |
| cpufreq_verify_within_cpu_limits(struct cpufreq_policy_data *policy) |
| { |
| cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, |
| policy->cpuinfo.max_freq); |
| } |
| |
| #ifdef CONFIG_CPU_FREQ |
| void cpufreq_suspend(void); |
| void cpufreq_resume(void); |
| int cpufreq_generic_suspend(struct cpufreq_policy *policy); |
| #else |
| static inline void cpufreq_suspend(void) {} |
| static inline void cpufreq_resume(void) {} |
| #endif |
| |
| /********************************************************************* |
| * CPUFREQ NOTIFIER INTERFACE * |
| *********************************************************************/ |
| |
| #define CPUFREQ_TRANSITION_NOTIFIER (0) |
| #define CPUFREQ_POLICY_NOTIFIER (1) |
| |
| /* Transition notifiers */ |
| #define CPUFREQ_PRECHANGE (0) |
| #define CPUFREQ_POSTCHANGE (1) |
| |
| /* Policy Notifiers */ |
| #define CPUFREQ_CREATE_POLICY (0) |
| #define CPUFREQ_REMOVE_POLICY (1) |
| |
| #ifdef CONFIG_CPU_FREQ |
| int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); |
| int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); |
| |
| void cpufreq_freq_transition_begin(struct cpufreq_policy *policy, |
| struct cpufreq_freqs *freqs); |
| void cpufreq_freq_transition_end(struct cpufreq_policy *policy, |
| struct cpufreq_freqs *freqs, int transition_failed); |
| |
| #else /* CONFIG_CPU_FREQ */ |
| static inline int cpufreq_register_notifier(struct notifier_block *nb, |
| unsigned int list) |
| { |
| return 0; |
| } |
| static inline int cpufreq_unregister_notifier(struct notifier_block *nb, |
| unsigned int list) |
| { |
| return 0; |
| } |
| #endif /* !CONFIG_CPU_FREQ */ |
| |
| /** |
| * cpufreq_scale - "old * mult / div" calculation for large values (32-bit-arch |
| * safe) |
| * @old: old value |
| * @div: divisor |
| * @mult: multiplier |
| * |
| * |
| * new = old * mult / div |
| */ |
| static inline unsigned long cpufreq_scale(unsigned long old, u_int div, |
| u_int mult) |
| { |
| #if BITS_PER_LONG == 32 |
| u64 result = ((u64) old) * ((u64) mult); |
| do_div(result, div); |
| return (unsigned long) result; |
| |
| #elif BITS_PER_LONG == 64 |
| unsigned long result = old * ((u64) mult); |
| result /= div; |
| return result; |
| #endif |
| } |
| |
| /********************************************************************* |
| * CPUFREQ GOVERNORS * |
| *********************************************************************/ |
| |
| #define CPUFREQ_POLICY_UNKNOWN (0) |
| /* |
| * If (cpufreq_driver->target) exists, the ->governor decides what frequency |
| * within the limits is used. If (cpufreq_driver->setpolicy> exists, these |
| * two generic policies are available: |
| */ |
| #define CPUFREQ_POLICY_POWERSAVE (1) |
| #define CPUFREQ_POLICY_PERFORMANCE (2) |
| |
| struct cpufreq_governor { |
| char name[CPUFREQ_NAME_LEN]; |
| int (*init)(struct cpufreq_policy *policy); |
| void (*exit)(struct cpufreq_policy *policy); |
| int (*start)(struct cpufreq_policy *policy); |
| void (*stop)(struct cpufreq_policy *policy); |
| void (*limits)(struct cpufreq_policy *policy); |
| ssize_t (*show_setspeed) (struct cpufreq_policy *policy, |
| char *buf); |
| int (*store_setspeed) (struct cpufreq_policy *policy, |
| unsigned int freq); |
| struct list_head governor_list; |
| struct module *owner; |
| u8 flags; |
| }; |
| |
| /* Governor flags */ |
| |
| /* For governors which change frequency dynamically by themselves */ |
| #define CPUFREQ_GOV_DYNAMIC_SWITCHING BIT(0) |
| |
| /* For governors wanting the target frequency to be set exactly */ |
| #define CPUFREQ_GOV_STRICT_TARGET BIT(1) |
| |
| |
| /* Pass a target to the cpufreq driver */ |
| unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy, |
| unsigned int target_freq); |
| void cpufreq_driver_adjust_perf(unsigned int cpu, |
| unsigned long min_perf, |
| unsigned long target_perf, |
| unsigned long capacity); |
| bool cpufreq_driver_has_adjust_perf(void); |
| int cpufreq_driver_target(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| unsigned int relation); |
| int __cpufreq_driver_target(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| unsigned int relation); |
| unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy, |
| unsigned int target_freq); |
| unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy); |
| int cpufreq_register_governor(struct cpufreq_governor *governor); |
| void cpufreq_unregister_governor(struct cpufreq_governor *governor); |
| int cpufreq_start_governor(struct cpufreq_policy *policy); |
| void cpufreq_stop_governor(struct cpufreq_policy *policy); |
| |
| #define cpufreq_governor_init(__governor) \ |
| static int __init __governor##_init(void) \ |
| { \ |
| return cpufreq_register_governor(&__governor); \ |
| } \ |
| core_initcall(__governor##_init) |
| |
| #define cpufreq_governor_exit(__governor) \ |
| static void __exit __governor##_exit(void) \ |
| { \ |
| return cpufreq_unregister_governor(&__governor); \ |
| } \ |
| module_exit(__governor##_exit) |
| |
| struct cpufreq_governor *cpufreq_default_governor(void); |
| struct cpufreq_governor *cpufreq_fallback_governor(void); |
| |
| static inline void cpufreq_policy_apply_limits(struct cpufreq_policy *policy) |
| { |
| if (policy->max < policy->cur) |
| __cpufreq_driver_target(policy, policy->max, |
| CPUFREQ_RELATION_HE); |
| else if (policy->min > policy->cur) |
| __cpufreq_driver_target(policy, policy->min, |
| CPUFREQ_RELATION_LE); |
| } |
| |
| /* Governor attribute set */ |
| struct gov_attr_set { |
| struct kobject kobj; |
| struct list_head policy_list; |
| struct mutex update_lock; |
| int usage_count; |
| }; |
| |
| /* sysfs ops for cpufreq governors */ |
| extern const struct sysfs_ops governor_sysfs_ops; |
| |
| static inline struct gov_attr_set *to_gov_attr_set(struct kobject *kobj) |
| { |
| return container_of(kobj, struct gov_attr_set, kobj); |
| } |
| |
| void gov_attr_set_init(struct gov_attr_set *attr_set, struct list_head *list_node); |
| void gov_attr_set_get(struct gov_attr_set *attr_set, struct list_head *list_node); |
| unsigned int gov_attr_set_put(struct gov_attr_set *attr_set, struct list_head *list_node); |
| |
| /* Governor sysfs attribute */ |
| struct governor_attr { |
| struct attribute attr; |
| ssize_t (*show)(struct gov_attr_set *attr_set, char *buf); |
| ssize_t (*store)(struct gov_attr_set *attr_set, const char *buf, |
| size_t count); |
| }; |
| |
| /********************************************************************* |
| * FREQUENCY TABLE HELPERS * |
| *********************************************************************/ |
| |
| /* Special Values of .frequency field */ |
| #define CPUFREQ_ENTRY_INVALID ~0u |
| #define CPUFREQ_TABLE_END ~1u |
| /* Special Values of .flags field */ |
| #define CPUFREQ_BOOST_FREQ (1 << 0) |
| #define CPUFREQ_INEFFICIENT_FREQ (1 << 1) |
| |
| struct cpufreq_frequency_table { |
| unsigned int flags; |
| unsigned int driver_data; /* driver specific data, not used by core */ |
| unsigned int frequency; /* kHz - doesn't need to be in ascending |
| * order */ |
| }; |
| |
| /* |
| * cpufreq_for_each_entry - iterate over a cpufreq_frequency_table |
| * @pos: the cpufreq_frequency_table * to use as a loop cursor. |
| * @table: the cpufreq_frequency_table * to iterate over. |
| */ |
| |
| #define cpufreq_for_each_entry(pos, table) \ |
| for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) |
| |
| /* |
| * cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table |
| * with index |
| * @pos: the cpufreq_frequency_table * to use as a loop cursor. |
| * @table: the cpufreq_frequency_table * to iterate over. |
| * @idx: the table entry currently being processed |
| */ |
| |
| #define cpufreq_for_each_entry_idx(pos, table, idx) \ |
| for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \ |
| pos++, idx++) |
| |
| /* |
| * cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table |
| * excluding CPUFREQ_ENTRY_INVALID frequencies. |
| * @pos: the cpufreq_frequency_table * to use as a loop cursor. |
| * @table: the cpufreq_frequency_table * to iterate over. |
| */ |
| |
| #define cpufreq_for_each_valid_entry(pos, table) \ |
| for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++) \ |
| if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ |
| continue; \ |
| else |
| |
| /* |
| * cpufreq_for_each_valid_entry_idx - iterate with index over a cpufreq |
| * frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies. |
| * @pos: the cpufreq_frequency_table * to use as a loop cursor. |
| * @table: the cpufreq_frequency_table * to iterate over. |
| * @idx: the table entry currently being processed |
| */ |
| |
| #define cpufreq_for_each_valid_entry_idx(pos, table, idx) \ |
| cpufreq_for_each_entry_idx(pos, table, idx) \ |
| if (pos->frequency == CPUFREQ_ENTRY_INVALID) \ |
| continue; \ |
| else |
| |
| /** |
| * cpufreq_for_each_efficient_entry_idx - iterate with index over a cpufreq |
| * frequency_table excluding CPUFREQ_ENTRY_INVALID and |
| * CPUFREQ_INEFFICIENT_FREQ frequencies. |
| * @pos: the &struct cpufreq_frequency_table to use as a loop cursor. |
| * @table: the &struct cpufreq_frequency_table to iterate over. |
| * @idx: the table entry currently being processed. |
| * @efficiencies: set to true to only iterate over efficient frequencies. |
| */ |
| |
| #define cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) \ |
| cpufreq_for_each_valid_entry_idx(pos, table, idx) \ |
| if (efficiencies && (pos->flags & CPUFREQ_INEFFICIENT_FREQ)) \ |
| continue; \ |
| else |
| |
| |
| int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy, |
| struct cpufreq_frequency_table *table); |
| |
| int cpufreq_frequency_table_verify(struct cpufreq_policy_data *policy, |
| struct cpufreq_frequency_table *table); |
| int cpufreq_generic_frequency_table_verify(struct cpufreq_policy_data *policy); |
| |
| int cpufreq_table_index_unsorted(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| unsigned int relation); |
| int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy, |
| unsigned int freq); |
| |
| ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf); |
| |
| #ifdef CONFIG_CPU_FREQ |
| int cpufreq_boost_trigger_state(int state); |
| bool cpufreq_boost_enabled(void); |
| int cpufreq_enable_boost_support(void); |
| bool policy_has_boost_freq(struct cpufreq_policy *policy); |
| |
| /* Find lowest freq at or above target in a table in ascending order */ |
| static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| struct cpufreq_frequency_table *table = policy->freq_table; |
| struct cpufreq_frequency_table *pos; |
| unsigned int freq; |
| int idx, best = -1; |
| |
| cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) { |
| freq = pos->frequency; |
| |
| if (freq >= target_freq) |
| return idx; |
| |
| best = idx; |
| } |
| |
| return best; |
| } |
| |
| /* Find lowest freq at or above target in a table in descending order */ |
| static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| struct cpufreq_frequency_table *table = policy->freq_table; |
| struct cpufreq_frequency_table *pos; |
| unsigned int freq; |
| int idx, best = -1; |
| |
| cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) { |
| freq = pos->frequency; |
| |
| if (freq == target_freq) |
| return idx; |
| |
| if (freq > target_freq) { |
| best = idx; |
| continue; |
| } |
| |
| /* No freq found above target_freq */ |
| if (best == -1) |
| return idx; |
| |
| return best; |
| } |
| |
| return best; |
| } |
| |
| /* Works only on sorted freq-tables */ |
| static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| target_freq = clamp_val(target_freq, policy->min, policy->max); |
| |
| if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) |
| return cpufreq_table_find_index_al(policy, target_freq, |
| efficiencies); |
| else |
| return cpufreq_table_find_index_dl(policy, target_freq, |
| efficiencies); |
| } |
| |
| /* Find highest freq at or below target in a table in ascending order */ |
| static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| struct cpufreq_frequency_table *table = policy->freq_table; |
| struct cpufreq_frequency_table *pos; |
| unsigned int freq; |
| int idx, best = -1; |
| |
| cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) { |
| freq = pos->frequency; |
| |
| if (freq == target_freq) |
| return idx; |
| |
| if (freq < target_freq) { |
| best = idx; |
| continue; |
| } |
| |
| /* No freq found below target_freq */ |
| if (best == -1) |
| return idx; |
| |
| return best; |
| } |
| |
| return best; |
| } |
| |
| /* Find highest freq at or below target in a table in descending order */ |
| static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| struct cpufreq_frequency_table *table = policy->freq_table; |
| struct cpufreq_frequency_table *pos; |
| unsigned int freq; |
| int idx, best = -1; |
| |
| cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) { |
| freq = pos->frequency; |
| |
| if (freq <= target_freq) |
| return idx; |
| |
| best = idx; |
| } |
| |
| return best; |
| } |
| |
| /* Works only on sorted freq-tables */ |
| static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| target_freq = clamp_val(target_freq, policy->min, policy->max); |
| |
| if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) |
| return cpufreq_table_find_index_ah(policy, target_freq, |
| efficiencies); |
| else |
| return cpufreq_table_find_index_dh(policy, target_freq, |
| efficiencies); |
| } |
| |
| /* Find closest freq to target in a table in ascending order */ |
| static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| struct cpufreq_frequency_table *table = policy->freq_table; |
| struct cpufreq_frequency_table *pos; |
| unsigned int freq; |
| int idx, best = -1; |
| |
| cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) { |
| freq = pos->frequency; |
| |
| if (freq == target_freq) |
| return idx; |
| |
| if (freq < target_freq) { |
| best = idx; |
| continue; |
| } |
| |
| /* No freq found below target_freq */ |
| if (best == -1) |
| return idx; |
| |
| /* Choose the closest freq */ |
| if (target_freq - table[best].frequency > freq - target_freq) |
| return idx; |
| |
| return best; |
| } |
| |
| return best; |
| } |
| |
| /* Find closest freq to target in a table in descending order */ |
| static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| struct cpufreq_frequency_table *table = policy->freq_table; |
| struct cpufreq_frequency_table *pos; |
| unsigned int freq; |
| int idx, best = -1; |
| |
| cpufreq_for_each_efficient_entry_idx(pos, table, idx, efficiencies) { |
| freq = pos->frequency; |
| |
| if (freq == target_freq) |
| return idx; |
| |
| if (freq > target_freq) { |
| best = idx; |
| continue; |
| } |
| |
| /* No freq found above target_freq */ |
| if (best == -1) |
| return idx; |
| |
| /* Choose the closest freq */ |
| if (table[best].frequency - target_freq > target_freq - freq) |
| return idx; |
| |
| return best; |
| } |
| |
| return best; |
| } |
| |
| /* Works only on sorted freq-tables */ |
| static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| bool efficiencies) |
| { |
| target_freq = clamp_val(target_freq, policy->min, policy->max); |
| |
| if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING) |
| return cpufreq_table_find_index_ac(policy, target_freq, |
| efficiencies); |
| else |
| return cpufreq_table_find_index_dc(policy, target_freq, |
| efficiencies); |
| } |
| |
| static inline bool cpufreq_is_in_limits(struct cpufreq_policy *policy, int idx) |
| { |
| unsigned int freq; |
| |
| if (idx < 0) |
| return false; |
| |
| freq = policy->freq_table[idx].frequency; |
| |
| return freq == clamp_val(freq, policy->min, policy->max); |
| } |
| |
| static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy, |
| unsigned int target_freq, |
| unsigned int relation) |
| { |
| bool efficiencies = policy->efficiencies_available && |
| (relation & CPUFREQ_RELATION_E); |
| int idx; |
| |
| /* cpufreq_table_index_unsorted() has no use for this flag anyway */ |
| relation &= ~CPUFREQ_RELATION_E; |
| |
| if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)) |
| return cpufreq_table_index_unsorted(policy, target_freq, |
| relation); |
| retry: |
| switch (relation) { |
| case CPUFREQ_RELATION_L: |
| idx = cpufreq_table_find_index_l(policy, target_freq, |
| efficiencies); |
| break; |
| case CPUFREQ_RELATION_H: |
| idx = cpufreq_table_find_index_h(policy, target_freq, |
| efficiencies); |
| break; |
| case CPUFREQ_RELATION_C: |
| idx = cpufreq_table_find_index_c(policy, target_freq, |
| efficiencies); |
| break; |
| default: |
| WARN_ON_ONCE(1); |
| return 0; |
| } |
| |
| /* Limit frequency index to honor policy->min/max */ |
| if (!cpufreq_is_in_limits(policy, idx) && efficiencies) { |
| efficiencies = false; |
| goto retry; |
| } |
| |
| return idx; |
| } |
| |
| static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy *policy) |
| { |
| struct cpufreq_frequency_table *pos; |
| int count = 0; |
| |
| if (unlikely(!policy->freq_table)) |
| return 0; |
| |
| cpufreq_for_each_valid_entry(pos, policy->freq_table) |
| count++; |
| |
| return count; |
| } |
| |
| /** |
| * cpufreq_table_set_inefficient() - Mark a frequency as inefficient |
| * @policy: the &struct cpufreq_policy containing the inefficient frequency |
| * @frequency: the inefficient frequency |
| * |
| * The &struct cpufreq_policy must use a sorted frequency table |
| * |
| * Return: %0 on success or a negative errno code |
| */ |
| |
| static inline int |
| cpufreq_table_set_inefficient(struct cpufreq_policy *policy, |
| unsigned int frequency) |
| { |
| struct cpufreq_frequency_table *pos; |
| |
| /* Not supported */ |
| if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED) |
| return -EINVAL; |
| |
| cpufreq_for_each_valid_entry(pos, policy->freq_table) { |
| if (pos->frequency == frequency) { |
| pos->flags |= CPUFREQ_INEFFICIENT_FREQ; |
| policy->efficiencies_available = true; |
| return 0; |
| } |
| } |
| |
| return -EINVAL; |
| } |
| |
| static inline int parse_perf_domain(int cpu, const char *list_name, |
| const char *cell_name, |
| struct of_phandle_args *args) |
| { |
| int ret; |
| |
| struct device_node *cpu_np __free(device_node) = of_cpu_device_node_get(cpu); |
| if (!cpu_np) |
| return -ENODEV; |
| |
| ret = of_parse_phandle_with_args(cpu_np, list_name, cell_name, 0, |
| args); |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| |
| static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name, |
| const char *cell_name, struct cpumask *cpumask, |
| struct of_phandle_args *pargs) |
| { |
| int cpu, ret; |
| struct of_phandle_args args; |
| |
| ret = parse_perf_domain(pcpu, list_name, cell_name, pargs); |
| if (ret < 0) |
| return ret; |
| |
| cpumask_set_cpu(pcpu, cpumask); |
| |
| for_each_possible_cpu(cpu) { |
| if (cpu == pcpu) |
| continue; |
| |
| ret = parse_perf_domain(cpu, list_name, cell_name, &args); |
| if (ret < 0) |
| continue; |
| |
| if (of_phandle_args_equal(pargs, &args)) |
| cpumask_set_cpu(cpu, cpumask); |
| |
| of_node_put(args.np); |
| } |
| |
| return 0; |
| } |
| #else |
| static inline int cpufreq_boost_trigger_state(int state) |
| { |
| return 0; |
| } |
| static inline bool cpufreq_boost_enabled(void) |
| { |
| return false; |
| } |
| |
| static inline int cpufreq_enable_boost_support(void) |
| { |
| return -EINVAL; |
| } |
| |
| static inline bool policy_has_boost_freq(struct cpufreq_policy *policy) |
| { |
| return false; |
| } |
| |
| static inline int |
| cpufreq_table_set_inefficient(struct cpufreq_policy *policy, |
| unsigned int frequency) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name, |
| const char *cell_name, struct cpumask *cpumask, |
| struct of_phandle_args *pargs) |
| { |
| return -EOPNOTSUPP; |
| } |
| #endif |
| |
| extern unsigned int arch_freq_get_on_cpu(int cpu); |
| |
| #ifndef arch_set_freq_scale |
| static __always_inline |
| void arch_set_freq_scale(const struct cpumask *cpus, |
| unsigned long cur_freq, |
| unsigned long max_freq) |
| { |
| } |
| #endif |
| |
| /* the following are really really optional */ |
| extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs; |
| extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs; |
| extern struct freq_attr *cpufreq_generic_attr[]; |
| int cpufreq_table_validate_and_sort(struct cpufreq_policy *policy); |
| |
| unsigned int cpufreq_generic_get(unsigned int cpu); |
| void cpufreq_generic_init(struct cpufreq_policy *policy, |
| struct cpufreq_frequency_table *table, |
| unsigned int transition_latency); |
| |
| static inline void cpufreq_register_em_with_opp(struct cpufreq_policy *policy) |
| { |
| dev_pm_opp_of_register_em(get_cpu_device(policy->cpu), |
| policy->related_cpus); |
| } |
| #endif /* _LINUX_CPUFREQ_H */ |