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Message-ID: <1521184106-24475-11-git-send-email-aaron.wu@analog.com>
Date: Fri, 16 Mar 2018 15:08:11 +0800
From: Aaron Wu <aaron.wu@...log.com>
To: <linux-kernel@...r.kernel.org>
CC: <aaron.wu@...log.com>
Subject: [Blackfin removal] [PATCH 13/28] cpufreq: Remove Blackfin CPU frequency support
Signed-off-by: Aaron Wu <aaron.wu@...log.com>
Remove Blackfin CPU frequency support
---
drivers/cpufreq/Makefile | 1 -
drivers/cpufreq/blackfin-cpufreq.c | 217 ---
drivers/cpufreq/cpufreq.c | 2612 ------------------------------------
3 files changed, 2830 deletions(-)
delete mode 100644 drivers/cpufreq/blackfin-cpufreq.c
delete mode 100644 drivers/cpufreq/cpufreq.c
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index c60c1e1..43e4254 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -100,7 +100,6 @@ obj-$(CONFIG_POWERNV_CPUFREQ) += powernv-cpufreq.o
##################################################################################
# Other platform drivers
-obj-$(CONFIG_BFIN_CPU_FREQ) += blackfin-cpufreq.o
obj-$(CONFIG_BMIPS_CPUFREQ) += bmips-cpufreq.o
obj-$(CONFIG_CRIS_MACH_ARTPEC3) += cris-artpec3-cpufreq.o
obj-$(CONFIG_ETRAXFS) += cris-etraxfs-cpufreq.o
diff --git a/drivers/cpufreq/blackfin-cpufreq.c b/drivers/cpufreq/blackfin-cpufreq.c
deleted file mode 100644
index 12e97d8..0000000
--- a/drivers/cpufreq/blackfin-cpufreq.c
+++ /dev/null
@@ -1,217 +0,0 @@
-/*
- * Blackfin core clock scaling
- *
- * Copyright 2008-2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/clk.h>
-#include <linux/cpufreq.h>
-#include <linux/fs.h>
-#include <linux/delay.h>
-#include <asm/blackfin.h>
-#include <asm/time.h>
-#include <asm/dpmc.h>
-
-
-/* this is the table of CCLK frequencies, in Hz */
-/* .driver_data is the entry in the auxiliary dpm_state_table[] */
-static struct cpufreq_frequency_table bfin_freq_table[] = {
- {
- .frequency = CPUFREQ_TABLE_END,
- .driver_data = 0,
- },
- {
- .frequency = CPUFREQ_TABLE_END,
- .driver_data = 1,
- },
- {
- .frequency = CPUFREQ_TABLE_END,
- .driver_data = 2,
- },
- {
- .frequency = CPUFREQ_TABLE_END,
- .driver_data = 0,
- },
-};
-
-static struct bfin_dpm_state {
- unsigned int csel; /* system clock divider */
- unsigned int tscale; /* change the divider on the core timer interrupt */
-} dpm_state_table[3];
-
-#if defined(CONFIG_CYCLES_CLOCKSOURCE)
-/*
- * normalized to maximum frequency offset for CYCLES,
- * used in time-ts cycles clock source, but could be used
- * somewhere also.
- */
-unsigned long long __bfin_cycles_off;
-unsigned int __bfin_cycles_mod;
-#endif
-
-/**************************************************************************/
-static void __init bfin_init_tables(unsigned long cclk, unsigned long sclk)
-{
-
- unsigned long csel, min_cclk;
- int index;
-
- /* Anomaly 273 seems to still exist on non-BF54x w/dcache turned on */
-#if ANOMALY_05000273 || ANOMALY_05000274 || \
- (!(defined(CONFIG_BF54x) || defined(CONFIG_BF60x)) \
- && defined(CONFIG_BFIN_EXTMEM_DCACHEABLE))
- min_cclk = sclk * 2;
-#else
- min_cclk = sclk;
-#endif
-
-#ifndef CONFIG_BF60x
- csel = ((bfin_read_PLL_DIV() & CSEL) >> 4);
-#else
- csel = bfin_read32(CGU0_DIV) & 0x1F;
-#endif
-
- for (index = 0; (cclk >> index) >= min_cclk && csel <= 3 && index < 3; index++, csel++) {
- bfin_freq_table[index].frequency = cclk >> index;
-#ifndef CONFIG_BF60x
- dpm_state_table[index].csel = csel << 4; /* Shift now into PLL_DIV bitpos */
-#else
- dpm_state_table[index].csel = csel;
-#endif
- dpm_state_table[index].tscale = (TIME_SCALE >> index) - 1;
-
- pr_debug("cpufreq: freq:%d csel:0x%x tscale:%d\n",
- bfin_freq_table[index].frequency,
- dpm_state_table[index].csel,
- dpm_state_table[index].tscale);
- }
- return;
-}
-
-static void bfin_adjust_core_timer(void *info)
-{
- unsigned int tscale;
- unsigned int index = *(unsigned int *)info;
-
- /* we have to adjust the core timer, because it is using cclk */
- tscale = dpm_state_table[index].tscale;
- bfin_write_TSCALE(tscale);
- return;
-}
-
-static unsigned int bfin_getfreq_khz(unsigned int cpu)
-{
- /* Both CoreA/B have the same core clock */
- return get_cclk() / 1000;
-}
-
-#ifdef CONFIG_BF60x
-static int cpu_set_cclk(int cpu, unsigned long new)
-{
- struct clk *clk;
- int ret;
-
- clk = clk_get(NULL, "CCLK");
- if (IS_ERR(clk))
- return -ENODEV;
-
- ret = clk_set_rate(clk, new);
- clk_put(clk);
- return ret;
-}
-#endif
-
-static int bfin_target(struct cpufreq_policy *policy, unsigned int index)
-{
-#ifndef CONFIG_BF60x
- unsigned int plldiv;
-#endif
- static unsigned long lpj_ref;
- static unsigned int lpj_ref_freq;
- unsigned int old_freq, new_freq;
- int ret = 0;
-
-#if defined(CONFIG_CYCLES_CLOCKSOURCE)
- cycles_t cycles;
-#endif
-
- old_freq = bfin_getfreq_khz(0);
- new_freq = bfin_freq_table[index].frequency;
-
-#ifndef CONFIG_BF60x
- plldiv = (bfin_read_PLL_DIV() & SSEL) | dpm_state_table[index].csel;
- bfin_write_PLL_DIV(plldiv);
-#else
- ret = cpu_set_cclk(policy->cpu, new_freq * 1000);
- if (ret != 0) {
- WARN_ONCE(ret, "cpufreq set freq failed %d\n", ret);
- return ret;
- }
-#endif
- on_each_cpu(bfin_adjust_core_timer, &index, 1);
-#if defined(CONFIG_CYCLES_CLOCKSOURCE)
- cycles = get_cycles();
- SSYNC();
- cycles += 10; /* ~10 cycles we lose after get_cycles() */
- __bfin_cycles_off += (cycles << __bfin_cycles_mod) - (cycles << index);
- __bfin_cycles_mod = index;
-#endif
- if (!lpj_ref_freq) {
- lpj_ref = loops_per_jiffy;
- lpj_ref_freq = old_freq;
- }
- if (new_freq != old_freq) {
- loops_per_jiffy = cpufreq_scale(lpj_ref,
- lpj_ref_freq, new_freq);
- }
-
- return ret;
-}
-
-static int __bfin_cpu_init(struct cpufreq_policy *policy)
-{
-
- unsigned long cclk, sclk;
-
- cclk = get_cclk() / 1000;
- sclk = get_sclk() / 1000;
-
- if (policy->cpu == CPUFREQ_CPU)
- bfin_init_tables(cclk, sclk);
-
- policy->cpuinfo.transition_latency = 50000; /* 50us assumed */
-
- return cpufreq_table_validate_and_show(policy, bfin_freq_table);
-}
-
-static struct cpufreq_driver bfin_driver = {
- .verify = cpufreq_generic_frequency_table_verify,
- .target_index = bfin_target,
- .get = bfin_getfreq_khz,
- .init = __bfin_cpu_init,
- .name = "bfin cpufreq",
- .attr = cpufreq_generic_attr,
-};
-
-static int __init bfin_cpu_init(void)
-{
- return cpufreq_register_driver(&bfin_driver);
-}
-
-static void __exit bfin_cpu_exit(void)
-{
- cpufreq_unregister_driver(&bfin_driver);
-}
-
-MODULE_AUTHOR("Michael Hennerich <hennerich@...ckfin.uclinux.org>");
-MODULE_DESCRIPTION("cpufreq driver for Blackfin");
-MODULE_LICENSE("GPL");
-
-module_init(bfin_cpu_init);
-module_exit(bfin_cpu_exit);
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
deleted file mode 100644
index de33ebf..0000000
--- a/drivers/cpufreq/cpufreq.c
+++ /dev/null
@@ -1,2612 +0,0 @@
-/*
- * linux/drivers/cpufreq/cpufreq.c
- *
- * Copyright (C) 2001 Russell King
- * (C) 2002 - 2003 Dominik Brodowski <linux@...do.de>
- * (C) 2013 Viresh Kumar <viresh.kumar@...aro.org>
- *
- * Oct 2005 - Ashok Raj <ashok.raj@...el.com>
- * Added handling for CPU hotplug
- * Feb 2006 - Jacob Shin <jacob.shin@....com>
- * Fix handling for CPU hotplug -- affected CPUs
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/cpu.h>
-#include <linux/cpufreq.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/init.h>
-#include <linux/kernel_stat.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/slab.h>
-#include <linux/suspend.h>
-#include <linux/syscore_ops.h>
-#include <linux/tick.h>
-#include <trace/events/power.h>
-
-static LIST_HEAD(cpufreq_policy_list);
-
-static inline bool policy_is_inactive(struct cpufreq_policy *policy)
-{
- return cpumask_empty(policy->cpus);
-}
-
-/* Macros to iterate over CPU policies */
-#define for_each_suitable_policy(__policy, __active) \
- list_for_each_entry(__policy, &cpufreq_policy_list, policy_list) \
- if ((__active) == !policy_is_inactive(__policy))
-
-#define for_each_active_policy(__policy) \
- for_each_suitable_policy(__policy, true)
-#define for_each_inactive_policy(__policy) \
- for_each_suitable_policy(__policy, false)
-
-#define for_each_policy(__policy) \
- list_for_each_entry(__policy, &cpufreq_policy_list, policy_list)
-
-/* Iterate over governors */
-static LIST_HEAD(cpufreq_governor_list);
-#define for_each_governor(__governor) \
- list_for_each_entry(__governor, &cpufreq_governor_list, governor_list)
-
-/**
- * The "cpufreq driver" - the arch- or hardware-dependent low
- * level driver of CPUFreq support, and its spinlock. This lock
- * also protects the cpufreq_cpu_data array.
- */
-static struct cpufreq_driver *cpufreq_driver;
-static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
-static DEFINE_RWLOCK(cpufreq_driver_lock);
-
-/* Flag to suspend/resume CPUFreq governors */
-static bool cpufreq_suspended;
-
-static inline bool has_target(void)
-{
- return cpufreq_driver->target_index || cpufreq_driver->target;
-}
-
-/* internal prototypes */
-static unsigned int __cpufreq_get(struct cpufreq_policy *policy);
-static int cpufreq_init_governor(struct cpufreq_policy *policy);
-static void cpufreq_exit_governor(struct cpufreq_policy *policy);
-static int cpufreq_start_governor(struct cpufreq_policy *policy);
-static void cpufreq_stop_governor(struct cpufreq_policy *policy);
-static void cpufreq_governor_limits(struct cpufreq_policy *policy);
-
-/**
- * Two notifier lists: the "policy" list is involved in the
- * validation process for a new CPU frequency policy; the
- * "transition" list for kernel code that needs to handle
- * changes to devices when the CPU clock speed changes.
- * The mutex locks both lists.
- */
-static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list);
-static struct srcu_notifier_head cpufreq_transition_notifier_list;
-
-static bool init_cpufreq_transition_notifier_list_called;
-static int __init init_cpufreq_transition_notifier_list(void)
-{
- srcu_init_notifier_head(&cpufreq_transition_notifier_list);
- init_cpufreq_transition_notifier_list_called = true;
- return 0;
-}
-pure_initcall(init_cpufreq_transition_notifier_list);
-
-static int off __read_mostly;
-static int cpufreq_disabled(void)
-{
- return off;
-}
-void disable_cpufreq(void)
-{
- off = 1;
-}
-static DEFINE_MUTEX(cpufreq_governor_mutex);
-
-bool have_governor_per_policy(void)
-{
- return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY);
-}
-EXPORT_SYMBOL_GPL(have_governor_per_policy);
-
-struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy)
-{
- if (have_governor_per_policy())
- return &policy->kobj;
- else
- return cpufreq_global_kobject;
-}
-EXPORT_SYMBOL_GPL(get_governor_parent_kobj);
-
-static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
-{
- u64 idle_time;
- u64 cur_wall_time;
- u64 busy_time;
-
- cur_wall_time = jiffies64_to_nsecs(get_jiffies_64());
-
- busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
- busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
-
- idle_time = cur_wall_time - busy_time;
- if (wall)
- *wall = div_u64(cur_wall_time, NSEC_PER_USEC);
-
- return div_u64(idle_time, NSEC_PER_USEC);
-}
-
-u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy)
-{
- u64 idle_time = get_cpu_idle_time_us(cpu, io_busy ? wall : NULL);
-
- if (idle_time == -1ULL)
- return get_cpu_idle_time_jiffy(cpu, wall);
- else if (!io_busy)
- idle_time += get_cpu_iowait_time_us(cpu, wall);
-
- return idle_time;
-}
-EXPORT_SYMBOL_GPL(get_cpu_idle_time);
-
-__weak void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
- unsigned long max_freq)
-{
-}
-EXPORT_SYMBOL_GPL(arch_set_freq_scale);
-
-/*
- * This is a generic cpufreq init() routine which can be used by cpufreq
- * drivers of SMP systems. It will do following:
- * - validate & show freq table passed
- * - set policies transition latency
- * - policy->cpus with all possible CPUs
- */
-int cpufreq_generic_init(struct cpufreq_policy *policy,
- struct cpufreq_frequency_table *table,
- unsigned int transition_latency)
-{
- int ret;
-
- ret = cpufreq_table_validate_and_show(policy, table);
- if (ret) {
- pr_err("%s: invalid frequency table: %d\n", __func__, ret);
- return ret;
- }
-
- policy->cpuinfo.transition_latency = transition_latency;
-
- /*
- * The driver only supports the SMP configuration where all processors
- * share the clock and voltage and clock.
- */
- cpumask_setall(policy->cpus);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(cpufreq_generic_init);
-
-struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
-{
- struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
-
- return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL;
-}
-EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw);
-
-unsigned int cpufreq_generic_get(unsigned int cpu)
-{
- struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
-
- if (!policy || IS_ERR(policy->clk)) {
- pr_err("%s: No %s associated to cpu: %d\n",
- __func__, policy ? "clk" : "policy", cpu);
- return 0;
- }
-
- return clk_get_rate(policy->clk) / 1000;
-}
-EXPORT_SYMBOL_GPL(cpufreq_generic_get);
-
-/**
- * cpufreq_cpu_get: returns policy for a cpu and marks it busy.
- *
- * @cpu: cpu to find policy for.
- *
- * This returns policy for 'cpu', returns NULL if it doesn't exist.
- * It also increments the kobject reference count to mark it busy and so would
- * require a corresponding call to cpufreq_cpu_put() to decrement it back.
- * If corresponding call cpufreq_cpu_put() isn't made, the policy wouldn't be
- * freed as that depends on the kobj count.
- *
- * Return: A valid policy on success, otherwise NULL on failure.
- */
-struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
-{
- struct cpufreq_policy *policy = NULL;
- unsigned long flags;
-
- if (WARN_ON(cpu >= nr_cpu_ids))
- return NULL;
-
- /* get the cpufreq driver */
- read_lock_irqsave(&cpufreq_driver_lock, flags);
-
- if (cpufreq_driver) {
- /* get the CPU */
- policy = cpufreq_cpu_get_raw(cpu);
- if (policy)
- kobject_get(&policy->kobj);
- }
-
- read_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- return policy;
-}
-EXPORT_SYMBOL_GPL(cpufreq_cpu_get);
-
-/**
- * cpufreq_cpu_put: Decrements the usage count of a policy
- *
- * @policy: policy earlier returned by cpufreq_cpu_get().
- *
- * This decrements the kobject reference count incremented earlier by calling
- * cpufreq_cpu_get().
- */
-void cpufreq_cpu_put(struct cpufreq_policy *policy)
-{
- kobject_put(&policy->kobj);
-}
-EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
-
-/*********************************************************************
- * EXTERNALLY AFFECTING FREQUENCY CHANGES *
- *********************************************************************/
-
-/**
- * adjust_jiffies - adjust the system "loops_per_jiffy"
- *
- * This function alters the system "loops_per_jiffy" for the clock
- * speed change. Note that loops_per_jiffy cannot be updated on SMP
- * systems as each CPU might be scaled differently. So, use the arch
- * per-CPU loops_per_jiffy value wherever possible.
- */
-static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
-{
-#ifndef CONFIG_SMP
- static unsigned long l_p_j_ref;
- static unsigned int l_p_j_ref_freq;
-
- if (ci->flags & CPUFREQ_CONST_LOOPS)
- return;
-
- if (!l_p_j_ref_freq) {
- l_p_j_ref = loops_per_jiffy;
- l_p_j_ref_freq = ci->old;
- pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n",
- l_p_j_ref, l_p_j_ref_freq);
- }
- if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) {
- loops_per_jiffy = cpufreq_scale(l_p_j_ref, l_p_j_ref_freq,
- ci->new);
- pr_debug("scaling loops_per_jiffy to %lu for frequency %u kHz\n",
- loops_per_jiffy, ci->new);
- }
-#endif
-}
-
-static void __cpufreq_notify_transition(struct cpufreq_policy *policy,
- struct cpufreq_freqs *freqs, unsigned int state)
-{
- BUG_ON(irqs_disabled());
-
- if (cpufreq_disabled())
- return;
-
- freqs->flags = cpufreq_driver->flags;
- pr_debug("notification %u of frequency transition to %u kHz\n",
- state, freqs->new);
-
- switch (state) {
-
- case CPUFREQ_PRECHANGE:
- /* detect if the driver reported a value as "old frequency"
- * which is not equal to what the cpufreq core thinks is
- * "old frequency".
- */
- if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
- if ((policy) && (policy->cpu == freqs->cpu) &&
- (policy->cur) && (policy->cur != freqs->old)) {
- pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n",
- freqs->old, policy->cur);
- freqs->old = policy->cur;
- }
- }
- srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
- CPUFREQ_PRECHANGE, freqs);
- adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
- break;
-
- case CPUFREQ_POSTCHANGE:
- adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
- pr_debug("FREQ: %lu - CPU: %lu\n",
- (unsigned long)freqs->new, (unsigned long)freqs->cpu);
- trace_cpu_frequency(freqs->new, freqs->cpu);
- cpufreq_stats_record_transition(policy, freqs->new);
- srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
- CPUFREQ_POSTCHANGE, freqs);
- if (likely(policy) && likely(policy->cpu == freqs->cpu))
- policy->cur = freqs->new;
- break;
- }
-}
-
-/**
- * cpufreq_notify_transition - call notifier chain and adjust_jiffies
- * on frequency transition.
- *
- * This function calls the transition notifiers and the "adjust_jiffies"
- * function. It is called twice on all CPU frequency changes that have
- * external effects.
- */
-static void cpufreq_notify_transition(struct cpufreq_policy *policy,
- struct cpufreq_freqs *freqs, unsigned int state)
-{
- for_each_cpu(freqs->cpu, policy->cpus)
- __cpufreq_notify_transition(policy, freqs, state);
-}
-
-/* Do post notifications when there are chances that transition has failed */
-static void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
- struct cpufreq_freqs *freqs, int transition_failed)
-{
- cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
- if (!transition_failed)
- return;
-
- swap(freqs->old, freqs->new);
- cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
- cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
-}
-
-void cpufreq_freq_transition_begin(struct cpufreq_policy *policy,
- struct cpufreq_freqs *freqs)
-{
-
- /*
- * Catch double invocations of _begin() which lead to self-deadlock.
- * ASYNC_NOTIFICATION drivers are left out because the cpufreq core
- * doesn't invoke _begin() on their behalf, and hence the chances of
- * double invocations are very low. Moreover, there are scenarios
- * where these checks can emit false-positive warnings in these
- * drivers; so we avoid that by skipping them altogether.
- */
- WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION)
- && current == policy->transition_task);
-
-wait:
- wait_event(policy->transition_wait, !policy->transition_ongoing);
-
- spin_lock(&policy->transition_lock);
-
- if (unlikely(policy->transition_ongoing)) {
- spin_unlock(&policy->transition_lock);
- goto wait;
- }
-
- policy->transition_ongoing = true;
- policy->transition_task = current;
-
- spin_unlock(&policy->transition_lock);
-
- cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
-}
-EXPORT_SYMBOL_GPL(cpufreq_freq_transition_begin);
-
-void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
- struct cpufreq_freqs *freqs, int transition_failed)
-{
- if (unlikely(WARN_ON(!policy->transition_ongoing)))
- return;
-
- cpufreq_notify_post_transition(policy, freqs, transition_failed);
-
- policy->transition_ongoing = false;
- policy->transition_task = NULL;
-
- wake_up(&policy->transition_wait);
-}
-EXPORT_SYMBOL_GPL(cpufreq_freq_transition_end);
-
-/*
- * Fast frequency switching status count. Positive means "enabled", negative
- * means "disabled" and 0 means "not decided yet".
- */
-static int cpufreq_fast_switch_count;
-static DEFINE_MUTEX(cpufreq_fast_switch_lock);
-
-static void cpufreq_list_transition_notifiers(void)
-{
- struct notifier_block *nb;
-
- pr_info("Registered transition notifiers:\n");
-
- mutex_lock(&cpufreq_transition_notifier_list.mutex);
-
- for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next)
- pr_info("%pF\n", nb->notifier_call);
-
- mutex_unlock(&cpufreq_transition_notifier_list.mutex);
-}
-
-/**
- * cpufreq_enable_fast_switch - Enable fast frequency switching for policy.
- * @policy: cpufreq policy to enable fast frequency switching for.
- *
- * Try to enable fast frequency switching for @policy.
- *
- * The attempt will fail if there is at least one transition notifier registered
- * at this point, as fast frequency switching is quite fundamentally at odds
- * with transition notifiers. Thus if successful, it will make registration of
- * transition notifiers fail going forward.
- */
-void cpufreq_enable_fast_switch(struct cpufreq_policy *policy)
-{
- lockdep_assert_held(&policy->rwsem);
-
- if (!policy->fast_switch_possible)
- return;
-
- mutex_lock(&cpufreq_fast_switch_lock);
- if (cpufreq_fast_switch_count >= 0) {
- cpufreq_fast_switch_count++;
- policy->fast_switch_enabled = true;
- } else {
- pr_warn("CPU%u: Fast frequency switching not enabled\n",
- policy->cpu);
- cpufreq_list_transition_notifiers();
- }
- mutex_unlock(&cpufreq_fast_switch_lock);
-}
-EXPORT_SYMBOL_GPL(cpufreq_enable_fast_switch);
-
-/**
- * cpufreq_disable_fast_switch - Disable fast frequency switching for policy.
- * @policy: cpufreq policy to disable fast frequency switching for.
- */
-void cpufreq_disable_fast_switch(struct cpufreq_policy *policy)
-{
- mutex_lock(&cpufreq_fast_switch_lock);
- if (policy->fast_switch_enabled) {
- policy->fast_switch_enabled = false;
- if (!WARN_ON(cpufreq_fast_switch_count <= 0))
- cpufreq_fast_switch_count--;
- }
- mutex_unlock(&cpufreq_fast_switch_lock);
-}
-EXPORT_SYMBOL_GPL(cpufreq_disable_fast_switch);
-
-/**
- * cpufreq_driver_resolve_freq - Map a target frequency to a driver-supported
- * one.
- * @target_freq: target frequency to resolve.
- *
- * The target to driver frequency mapping is cached in the policy.
- *
- * Return: Lowest driver-supported frequency greater than or equal to the
- * given target_freq, subject to policy (min/max) and driver limitations.
- */
-unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
- unsigned int target_freq)
-{
- target_freq = clamp_val(target_freq, policy->min, policy->max);
- policy->cached_target_freq = target_freq;
-
- if (cpufreq_driver->target_index) {
- int idx;
-
- idx = cpufreq_frequency_table_target(policy, target_freq,
- CPUFREQ_RELATION_L);
- policy->cached_resolved_idx = idx;
- return policy->freq_table[idx].frequency;
- }
-
- if (cpufreq_driver->resolve_freq)
- return cpufreq_driver->resolve_freq(policy, target_freq);
-
- return target_freq;
-}
-EXPORT_SYMBOL_GPL(cpufreq_driver_resolve_freq);
-
-unsigned int cpufreq_policy_transition_delay_us(struct cpufreq_policy *policy)
-{
- unsigned int latency;
-
- if (policy->transition_delay_us)
- return policy->transition_delay_us;
-
- latency = policy->cpuinfo.transition_latency / NSEC_PER_USEC;
- if (latency) {
- /*
- * For platforms that can change the frequency very fast (< 10
- * us), the above formula gives a decent transition delay. But
- * for platforms where transition_latency is in milliseconds, it
- * ends up giving unrealistic values.
- *
- * Cap the default transition delay to 10 ms, which seems to be
- * a reasonable amount of time after which we should reevaluate
- * the frequency.
- */
- return min(latency * LATENCY_MULTIPLIER, (unsigned int)10000);
- }
-
- return LATENCY_MULTIPLIER;
-}
-EXPORT_SYMBOL_GPL(cpufreq_policy_transition_delay_us);
-
-/*********************************************************************
- * SYSFS INTERFACE *
- *********************************************************************/
-static ssize_t show_boost(struct kobject *kobj,
- struct attribute *attr, char *buf)
-{
- return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled);
-}
-
-static ssize_t store_boost(struct kobject *kobj, struct attribute *attr,
- const char *buf, size_t count)
-{
- int ret, enable;
-
- ret = sscanf(buf, "%d", &enable);
- if (ret != 1 || enable < 0 || enable > 1)
- return -EINVAL;
-
- if (cpufreq_boost_trigger_state(enable)) {
- pr_err("%s: Cannot %s BOOST!\n",
- __func__, enable ? "enable" : "disable");
- return -EINVAL;
- }
-
- pr_debug("%s: cpufreq BOOST %s\n",
- __func__, enable ? "enabled" : "disabled");
-
- return count;
-}
-define_one_global_rw(boost);
-
-static struct cpufreq_governor *find_governor(const char *str_governor)
-{
- struct cpufreq_governor *t;
-
- for_each_governor(t)
- if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN))
- return t;
-
- return NULL;
-}
-
-/**
- * cpufreq_parse_governor - parse a governor string
- */
-static int cpufreq_parse_governor(char *str_governor,
- struct cpufreq_policy *policy)
-{
- if (cpufreq_driver->setpolicy) {
- if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) {
- policy->policy = CPUFREQ_POLICY_PERFORMANCE;
- return 0;
- }
-
- if (!strncasecmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) {
- policy->policy = CPUFREQ_POLICY_POWERSAVE;
- return 0;
- }
- } else {
- struct cpufreq_governor *t;
-
- mutex_lock(&cpufreq_governor_mutex);
-
- t = find_governor(str_governor);
- if (!t) {
- int ret;
-
- mutex_unlock(&cpufreq_governor_mutex);
-
- ret = request_module("cpufreq_%s", str_governor);
- if (ret)
- return -EINVAL;
-
- mutex_lock(&cpufreq_governor_mutex);
-
- t = find_governor(str_governor);
- }
- if (t && !try_module_get(t->owner))
- t = NULL;
-
- mutex_unlock(&cpufreq_governor_mutex);
-
- if (t) {
- policy->governor = t;
- return 0;
- }
- }
-
- return -EINVAL;
-}
-
-/**
- * cpufreq_per_cpu_attr_read() / show_##file_name() -
- * print out cpufreq information
- *
- * Write out information from cpufreq_driver->policy[cpu]; object must be
- * "unsigned int".
- */
-
-#define show_one(file_name, object) \
-static ssize_t show_##file_name \
-(struct cpufreq_policy *policy, char *buf) \
-{ \
- return sprintf(buf, "%u\n", policy->object); \
-}
-
-show_one(cpuinfo_min_freq, cpuinfo.min_freq);
-show_one(cpuinfo_max_freq, cpuinfo.max_freq);
-show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
-show_one(scaling_min_freq, min);
-show_one(scaling_max_freq, max);
-
-__weak unsigned int arch_freq_get_on_cpu(int cpu)
-{
- return 0;
-}
-
-static ssize_t show_scaling_cur_freq(struct cpufreq_policy *policy, char *buf)
-{
- ssize_t ret;
- unsigned int freq;
-
- freq = arch_freq_get_on_cpu(policy->cpu);
- if (freq)
- ret = sprintf(buf, "%u\n", freq);
- else if (cpufreq_driver && cpufreq_driver->setpolicy &&
- cpufreq_driver->get)
- ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu));
- else
- ret = sprintf(buf, "%u\n", policy->cur);
- return ret;
-}
-
-static int cpufreq_set_policy(struct cpufreq_policy *policy,
- struct cpufreq_policy *new_policy);
-
-/**
- * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
- */
-#define store_one(file_name, object) \
-static ssize_t store_##file_name \
-(struct cpufreq_policy *policy, const char *buf, size_t count) \
-{ \
- int ret, temp; \
- struct cpufreq_policy new_policy; \
- \
- memcpy(&new_policy, policy, sizeof(*policy)); \
- \
- ret = sscanf(buf, "%u", &new_policy.object); \
- if (ret != 1) \
- return -EINVAL; \
- \
- temp = new_policy.object; \
- ret = cpufreq_set_policy(policy, &new_policy); \
- if (!ret) \
- policy->user_policy.object = temp; \
- \
- return ret ? ret : count; \
-}
-
-store_one(scaling_min_freq, min);
-store_one(scaling_max_freq, max);
-
-/**
- * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
- */
-static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy,
- char *buf)
-{
- unsigned int cur_freq = __cpufreq_get(policy);
-
- if (cur_freq)
- return sprintf(buf, "%u\n", cur_freq);
-
- return sprintf(buf, "<unknown>\n");
-}
-
-/**
- * show_scaling_governor - show the current policy for the specified CPU
- */
-static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
-{
- if (policy->policy == CPUFREQ_POLICY_POWERSAVE)
- return sprintf(buf, "powersave\n");
- else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE)
- return sprintf(buf, "performance\n");
- else if (policy->governor)
- return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n",
- policy->governor->name);
- return -EINVAL;
-}
-
-/**
- * store_scaling_governor - store policy for the specified CPU
- */
-static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
- const char *buf, size_t count)
-{
- int ret;
- char str_governor[16];
- struct cpufreq_policy new_policy;
-
- memcpy(&new_policy, policy, sizeof(*policy));
-
- ret = sscanf(buf, "%15s", str_governor);
- if (ret != 1)
- return -EINVAL;
-
- if (cpufreq_parse_governor(str_governor, &new_policy))
- return -EINVAL;
-
- ret = cpufreq_set_policy(policy, &new_policy);
-
- if (new_policy.governor)
- module_put(new_policy.governor->owner);
-
- return ret ? ret : count;
-}
-
-/**
- * show_scaling_driver - show the cpufreq driver currently loaded
- */
-static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf)
-{
- return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name);
-}
-
-/**
- * show_scaling_available_governors - show the available CPUfreq governors
- */
-static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
- char *buf)
-{
- ssize_t i = 0;
- struct cpufreq_governor *t;
-
- if (!has_target()) {
- i += sprintf(buf, "performance powersave");
- goto out;
- }
-
- for_each_governor(t) {
- if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char))
- - (CPUFREQ_NAME_LEN + 2)))
- goto out;
- i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name);
- }
-out:
- i += sprintf(&buf[i], "\n");
- return i;
-}
-
-ssize_t cpufreq_show_cpus(const struct cpumask *mask, char *buf)
-{
- ssize_t i = 0;
- unsigned int cpu;
-
- for_each_cpu(cpu, mask) {
- if (i)
- i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), " ");
- i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u", cpu);
- if (i >= (PAGE_SIZE - 5))
- break;
- }
- i += sprintf(&buf[i], "\n");
- return i;
-}
-EXPORT_SYMBOL_GPL(cpufreq_show_cpus);
-
-/**
- * show_related_cpus - show the CPUs affected by each transition even if
- * hw coordination is in use
- */
-static ssize_t show_related_cpus(struct cpufreq_policy *policy, char *buf)
-{
- return cpufreq_show_cpus(policy->related_cpus, buf);
-}
-
-/**
- * show_affected_cpus - show the CPUs affected by each transition
- */
-static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
-{
- return cpufreq_show_cpus(policy->cpus, buf);
-}
-
-static ssize_t store_scaling_setspeed(struct cpufreq_policy *policy,
- const char *buf, size_t count)
-{
- unsigned int freq = 0;
- unsigned int ret;
-
- if (!policy->governor || !policy->governor->store_setspeed)
- return -EINVAL;
-
- ret = sscanf(buf, "%u", &freq);
- if (ret != 1)
- return -EINVAL;
-
- policy->governor->store_setspeed(policy, freq);
-
- return count;
-}
-
-static ssize_t show_scaling_setspeed(struct cpufreq_policy *policy, char *buf)
-{
- if (!policy->governor || !policy->governor->show_setspeed)
- return sprintf(buf, "<unsupported>\n");
-
- return policy->governor->show_setspeed(policy, buf);
-}
-
-/**
- * show_bios_limit - show the current cpufreq HW/BIOS limitation
- */
-static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf)
-{
- unsigned int limit;
- int ret;
- if (cpufreq_driver->bios_limit) {
- ret = cpufreq_driver->bios_limit(policy->cpu, &limit);
- if (!ret)
- return sprintf(buf, "%u\n", limit);
- }
- return sprintf(buf, "%u\n", policy->cpuinfo.max_freq);
-}
-
-cpufreq_freq_attr_ro_perm(cpuinfo_cur_freq, 0400);
-cpufreq_freq_attr_ro(cpuinfo_min_freq);
-cpufreq_freq_attr_ro(cpuinfo_max_freq);
-cpufreq_freq_attr_ro(cpuinfo_transition_latency);
-cpufreq_freq_attr_ro(scaling_available_governors);
-cpufreq_freq_attr_ro(scaling_driver);
-cpufreq_freq_attr_ro(scaling_cur_freq);
-cpufreq_freq_attr_ro(bios_limit);
-cpufreq_freq_attr_ro(related_cpus);
-cpufreq_freq_attr_ro(affected_cpus);
-cpufreq_freq_attr_rw(scaling_min_freq);
-cpufreq_freq_attr_rw(scaling_max_freq);
-cpufreq_freq_attr_rw(scaling_governor);
-cpufreq_freq_attr_rw(scaling_setspeed);
-
-static struct attribute *default_attrs[] = {
- &cpuinfo_min_freq.attr,
- &cpuinfo_max_freq.attr,
- &cpuinfo_transition_latency.attr,
- &scaling_min_freq.attr,
- &scaling_max_freq.attr,
- &affected_cpus.attr,
- &related_cpus.attr,
- &scaling_governor.attr,
- &scaling_driver.attr,
- &scaling_available_governors.attr,
- &scaling_setspeed.attr,
- NULL
-};
-
-#define to_policy(k) container_of(k, struct cpufreq_policy, kobj)
-#define to_attr(a) container_of(a, struct freq_attr, attr)
-
-static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
-{
- struct cpufreq_policy *policy = to_policy(kobj);
- struct freq_attr *fattr = to_attr(attr);
- ssize_t ret;
-
- down_read(&policy->rwsem);
- ret = fattr->show(policy, buf);
- up_read(&policy->rwsem);
-
- return ret;
-}
-
-static ssize_t store(struct kobject *kobj, struct attribute *attr,
- const char *buf, size_t count)
-{
- struct cpufreq_policy *policy = to_policy(kobj);
- struct freq_attr *fattr = to_attr(attr);
- ssize_t ret = -EINVAL;
-
- cpus_read_lock();
-
- if (cpu_online(policy->cpu)) {
- down_write(&policy->rwsem);
- ret = fattr->store(policy, buf, count);
- up_write(&policy->rwsem);
- }
-
- cpus_read_unlock();
-
- return ret;
-}
-
-static void cpufreq_sysfs_release(struct kobject *kobj)
-{
- struct cpufreq_policy *policy = to_policy(kobj);
- pr_debug("last reference is dropped\n");
- complete(&policy->kobj_unregister);
-}
-
-static const struct sysfs_ops sysfs_ops = {
- .show = show,
- .store = store,
-};
-
-static struct kobj_type ktype_cpufreq = {
- .sysfs_ops = &sysfs_ops,
- .default_attrs = default_attrs,
- .release = cpufreq_sysfs_release,
-};
-
-static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu)
-{
- struct device *dev = get_cpu_device(cpu);
-
- if (!dev)
- return;
-
- if (cpumask_test_and_set_cpu(cpu, policy->real_cpus))
- return;
-
- dev_dbg(dev, "%s: Adding symlink\n", __func__);
- if (sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq"))
- dev_err(dev, "cpufreq symlink creation failed\n");
-}
-
-static void remove_cpu_dev_symlink(struct cpufreq_policy *policy,
- struct device *dev)
-{
- dev_dbg(dev, "%s: Removing symlink\n", __func__);
- sysfs_remove_link(&dev->kobj, "cpufreq");
-}
-
-static int cpufreq_add_dev_interface(struct cpufreq_policy *policy)
-{
- struct freq_attr **drv_attr;
- int ret = 0;
-
- /* set up files for this cpu device */
- drv_attr = cpufreq_driver->attr;
- while (drv_attr && *drv_attr) {
- ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
- if (ret)
- return ret;
- drv_attr++;
- }
- if (cpufreq_driver->get) {
- ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr);
- if (ret)
- return ret;
- }
-
- ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr);
- if (ret)
- return ret;
-
- if (cpufreq_driver->bios_limit) {
- ret = sysfs_create_file(&policy->kobj, &bios_limit.attr);
- if (ret)
- return ret;
- }
-
- return 0;
-}
-
-__weak struct cpufreq_governor *cpufreq_default_governor(void)
-{
- return NULL;
-}
-
-static int cpufreq_init_policy(struct cpufreq_policy *policy)
-{
- struct cpufreq_governor *gov = NULL;
- struct cpufreq_policy new_policy;
-
- memcpy(&new_policy, policy, sizeof(*policy));
-
- /* Update governor of new_policy to the governor used before hotplug */
- gov = find_governor(policy->last_governor);
- if (gov) {
- pr_debug("Restoring governor %s for cpu %d\n",
- policy->governor->name, policy->cpu);
- } else {
- gov = cpufreq_default_governor();
- if (!gov)
- return -ENODATA;
- }
-
- new_policy.governor = gov;
-
- /* Use the default policy if there is no last_policy. */
- if (cpufreq_driver->setpolicy) {
- if (policy->last_policy)
- new_policy.policy = policy->last_policy;
- else
- cpufreq_parse_governor(gov->name, &new_policy);
- }
- /* set default policy */
- return cpufreq_set_policy(policy, &new_policy);
-}
-
-static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
-{
- int ret = 0;
-
- /* Has this CPU been taken care of already? */
- if (cpumask_test_cpu(cpu, policy->cpus))
- return 0;
-
- down_write(&policy->rwsem);
- if (has_target())
- cpufreq_stop_governor(policy);
-
- cpumask_set_cpu(cpu, policy->cpus);
-
- if (has_target()) {
- ret = cpufreq_start_governor(policy);
- if (ret)
- pr_err("%s: Failed to start governor\n", __func__);
- }
- up_write(&policy->rwsem);
- return ret;
-}
-
-static void handle_update(struct work_struct *work)
-{
- struct cpufreq_policy *policy =
- container_of(work, struct cpufreq_policy, update);
- unsigned int cpu = policy->cpu;
- pr_debug("handle_update for cpu %u called\n", cpu);
- cpufreq_update_policy(cpu);
-}
-
-static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
-{
- struct cpufreq_policy *policy;
- int ret;
-
- policy = kzalloc(sizeof(*policy), GFP_KERNEL);
- if (!policy)
- return NULL;
-
- if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL))
- goto err_free_policy;
-
- if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
- goto err_free_cpumask;
-
- if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL))
- goto err_free_rcpumask;
-
- ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
- cpufreq_global_kobject, "policy%u", cpu);
- if (ret) {
- pr_err("%s: failed to init policy->kobj: %d\n", __func__, ret);
- goto err_free_real_cpus;
- }
-
- INIT_LIST_HEAD(&policy->policy_list);
- init_rwsem(&policy->rwsem);
- spin_lock_init(&policy->transition_lock);
- init_waitqueue_head(&policy->transition_wait);
- init_completion(&policy->kobj_unregister);
- INIT_WORK(&policy->update, handle_update);
-
- policy->cpu = cpu;
- return policy;
-
-err_free_real_cpus:
- free_cpumask_var(policy->real_cpus);
-err_free_rcpumask:
- free_cpumask_var(policy->related_cpus);
-err_free_cpumask:
- free_cpumask_var(policy->cpus);
-err_free_policy:
- kfree(policy);
-
- return NULL;
-}
-
-static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy)
-{
- struct kobject *kobj;
- struct completion *cmp;
-
- down_write(&policy->rwsem);
- cpufreq_stats_free_table(policy);
- kobj = &policy->kobj;
- cmp = &policy->kobj_unregister;
- up_write(&policy->rwsem);
- kobject_put(kobj);
-
- /*
- * We need to make sure that the underlying kobj is
- * actually not referenced anymore by anybody before we
- * proceed with unloading.
- */
- pr_debug("waiting for dropping of refcount\n");
- wait_for_completion(cmp);
- pr_debug("wait complete\n");
-}
-
-static void cpufreq_policy_free(struct cpufreq_policy *policy)
-{
- unsigned long flags;
- int cpu;
-
- /* Remove policy from list */
- write_lock_irqsave(&cpufreq_driver_lock, flags);
- list_del(&policy->policy_list);
-
- for_each_cpu(cpu, policy->related_cpus)
- per_cpu(cpufreq_cpu_data, cpu) = NULL;
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- cpufreq_policy_put_kobj(policy);
- free_cpumask_var(policy->real_cpus);
- free_cpumask_var(policy->related_cpus);
- free_cpumask_var(policy->cpus);
- kfree(policy);
-}
-
-static int cpufreq_online(unsigned int cpu)
-{
- struct cpufreq_policy *policy;
- bool new_policy;
- unsigned long flags;
- unsigned int j;
- int ret;
-
- pr_debug("%s: bringing CPU%u online\n", __func__, cpu);
-
- /* Check if this CPU already has a policy to manage it */
- policy = per_cpu(cpufreq_cpu_data, cpu);
- if (policy) {
- WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus));
- if (!policy_is_inactive(policy))
- return cpufreq_add_policy_cpu(policy, cpu);
-
- /* This is the only online CPU for the policy. Start over. */
- new_policy = false;
- down_write(&policy->rwsem);
- policy->cpu = cpu;
- policy->governor = NULL;
- up_write(&policy->rwsem);
- } else {
- new_policy = true;
- policy = cpufreq_policy_alloc(cpu);
- if (!policy)
- return -ENOMEM;
- }
-
- cpumask_copy(policy->cpus, cpumask_of(cpu));
-
- /* call driver. From then on the cpufreq must be able
- * to accept all calls to ->verify and ->setpolicy for this CPU
- */
- ret = cpufreq_driver->init(policy);
- if (ret) {
- pr_debug("initialization failed\n");
- goto out_free_policy;
- }
-
- down_write(&policy->rwsem);
-
- if (new_policy) {
- /* related_cpus should at least include policy->cpus. */
- cpumask_copy(policy->related_cpus, policy->cpus);
- }
-
- /*
- * affected cpus must always be the one, which are online. We aren't
- * managing offline cpus here.
- */
- cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);
-
- if (new_policy) {
- policy->user_policy.min = policy->min;
- policy->user_policy.max = policy->max;
-
- for_each_cpu(j, policy->related_cpus) {
- per_cpu(cpufreq_cpu_data, j) = policy;
- add_cpu_dev_symlink(policy, j);
- }
- } else {
- policy->min = policy->user_policy.min;
- policy->max = policy->user_policy.max;
- }
-
- if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
- policy->cur = cpufreq_driver->get(policy->cpu);
- if (!policy->cur) {
- pr_err("%s: ->get() failed\n", __func__);
- goto out_exit_policy;
- }
- }
-
- /*
- * Sometimes boot loaders set CPU frequency to a value outside of
- * frequency table present with cpufreq core. In such cases CPU might be
- * unstable if it has to run on that frequency for long duration of time
- * and so its better to set it to a frequency which is specified in
- * freq-table. This also makes cpufreq stats inconsistent as
- * cpufreq-stats would fail to register because current frequency of CPU
- * isn't found in freq-table.
- *
- * Because we don't want this change to effect boot process badly, we go
- * for the next freq which is >= policy->cur ('cur' must be set by now,
- * otherwise we will end up setting freq to lowest of the table as 'cur'
- * is initialized to zero).
- *
- * We are passing target-freq as "policy->cur - 1" otherwise
- * __cpufreq_driver_target() would simply fail, as policy->cur will be
- * equal to target-freq.
- */
- if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK)
- && has_target()) {
- /* Are we running at unknown frequency ? */
- ret = cpufreq_frequency_table_get_index(policy, policy->cur);
- if (ret == -EINVAL) {
- /* Warn user and fix it */
- pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n",
- __func__, policy->cpu, policy->cur);
- ret = __cpufreq_driver_target(policy, policy->cur - 1,
- CPUFREQ_RELATION_L);
-
- /*
- * Reaching here after boot in a few seconds may not
- * mean that system will remain stable at "unknown"
- * frequency for longer duration. Hence, a BUG_ON().
- */
- BUG_ON(ret);
- pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n",
- __func__, policy->cpu, policy->cur);
- }
- }
-
- if (new_policy) {
- ret = cpufreq_add_dev_interface(policy);
- if (ret)
- goto out_exit_policy;
-
- cpufreq_stats_create_table(policy);
-
- write_lock_irqsave(&cpufreq_driver_lock, flags);
- list_add(&policy->policy_list, &cpufreq_policy_list);
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
- }
-
- ret = cpufreq_init_policy(policy);
- if (ret) {
- pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n",
- __func__, cpu, ret);
- /* cpufreq_policy_free() will notify based on this */
- new_policy = false;
- goto out_exit_policy;
- }
-
- up_write(&policy->rwsem);
-
- kobject_uevent(&policy->kobj, KOBJ_ADD);
-
- /* Callback for handling stuff after policy is ready */
- if (cpufreq_driver->ready)
- cpufreq_driver->ready(policy);
-
- pr_debug("initialization complete\n");
-
- return 0;
-
-out_exit_policy:
- up_write(&policy->rwsem);
-
- if (cpufreq_driver->exit)
- cpufreq_driver->exit(policy);
-
- for_each_cpu(j, policy->real_cpus)
- remove_cpu_dev_symlink(policy, get_cpu_device(j));
-
-out_free_policy:
- cpufreq_policy_free(policy);
- return ret;
-}
-
-/**
- * cpufreq_add_dev - the cpufreq interface for a CPU device.
- * @dev: CPU device.
- * @sif: Subsystem interface structure pointer (not used)
- */
-static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
-{
- struct cpufreq_policy *policy;
- unsigned cpu = dev->id;
- int ret;
-
- dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu);
-
- if (cpu_online(cpu)) {
- ret = cpufreq_online(cpu);
- if (ret)
- return ret;
- }
-
- /* Create sysfs link on CPU registration */
- policy = per_cpu(cpufreq_cpu_data, cpu);
- if (policy)
- add_cpu_dev_symlink(policy, cpu);
-
- return 0;
-}
-
-static int cpufreq_offline(unsigned int cpu)
-{
- struct cpufreq_policy *policy;
- int ret;
-
- pr_debug("%s: unregistering CPU %u\n", __func__, cpu);
-
- policy = cpufreq_cpu_get_raw(cpu);
- if (!policy) {
- pr_debug("%s: No cpu_data found\n", __func__);
- return 0;
- }
-
- down_write(&policy->rwsem);
- if (has_target())
- cpufreq_stop_governor(policy);
-
- cpumask_clear_cpu(cpu, policy->cpus);
-
- if (policy_is_inactive(policy)) {
- if (has_target())
- strncpy(policy->last_governor, policy->governor->name,
- CPUFREQ_NAME_LEN);
- else
- policy->last_policy = policy->policy;
- } else if (cpu == policy->cpu) {
- /* Nominate new CPU */
- policy->cpu = cpumask_any(policy->cpus);
- }
-
- /* Start governor again for active policy */
- if (!policy_is_inactive(policy)) {
- if (has_target()) {
- ret = cpufreq_start_governor(policy);
- if (ret)
- pr_err("%s: Failed to start governor\n", __func__);
- }
-
- goto unlock;
- }
-
- if (cpufreq_driver->stop_cpu)
- cpufreq_driver->stop_cpu(policy);
-
- if (has_target())
- cpufreq_exit_governor(policy);
-
- /*
- * Perform the ->exit() even during light-weight tear-down,
- * since this is a core component, and is essential for the
- * subsequent light-weight ->init() to succeed.
- */
- if (cpufreq_driver->exit) {
- cpufreq_driver->exit(policy);
- policy->freq_table = NULL;
- }
-
-unlock:
- up_write(&policy->rwsem);
- return 0;
-}
-
-/**
- * cpufreq_remove_dev - remove a CPU device
- *
- * Removes the cpufreq interface for a CPU device.
- */
-static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
-{
- unsigned int cpu = dev->id;
- struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
-
- if (!policy)
- return;
-
- if (cpu_online(cpu))
- cpufreq_offline(cpu);
-
- cpumask_clear_cpu(cpu, policy->real_cpus);
- remove_cpu_dev_symlink(policy, dev);
-
- if (cpumask_empty(policy->real_cpus))
- cpufreq_policy_free(policy);
-}
-
-/**
- * cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're
- * in deep trouble.
- * @policy: policy managing CPUs
- * @new_freq: CPU frequency the CPU actually runs at
- *
- * We adjust to current frequency first, and need to clean up later.
- * So either call to cpufreq_update_policy() or schedule handle_update()).
- */
-static void cpufreq_out_of_sync(struct cpufreq_policy *policy,
- unsigned int new_freq)
-{
- struct cpufreq_freqs freqs;
-
- pr_debug("Warning: CPU frequency out of sync: cpufreq and timing core thinks of %u, is %u kHz\n",
- policy->cur, new_freq);
-
- freqs.old = policy->cur;
- freqs.new = new_freq;
-
- cpufreq_freq_transition_begin(policy, &freqs);
- cpufreq_freq_transition_end(policy, &freqs, 0);
-}
-
-/**
- * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur
- * @cpu: CPU number
- *
- * This is the last known freq, without actually getting it from the driver.
- * Return value will be same as what is shown in scaling_cur_freq in sysfs.
- */
-unsigned int cpufreq_quick_get(unsigned int cpu)
-{
- struct cpufreq_policy *policy;
- unsigned int ret_freq = 0;
- unsigned long flags;
-
- read_lock_irqsave(&cpufreq_driver_lock, flags);
-
- if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) {
- ret_freq = cpufreq_driver->get(cpu);
- read_unlock_irqrestore(&cpufreq_driver_lock, flags);
- return ret_freq;
- }
-
- read_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- policy = cpufreq_cpu_get(cpu);
- if (policy) {
- ret_freq = policy->cur;
- cpufreq_cpu_put(policy);
- }
-
- return ret_freq;
-}
-EXPORT_SYMBOL(cpufreq_quick_get);
-
-/**
- * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU
- * @cpu: CPU number
- *
- * Just return the max possible frequency for a given CPU.
- */
-unsigned int cpufreq_quick_get_max(unsigned int cpu)
-{
- struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
- unsigned int ret_freq = 0;
-
- if (policy) {
- ret_freq = policy->max;
- cpufreq_cpu_put(policy);
- }
-
- return ret_freq;
-}
-EXPORT_SYMBOL(cpufreq_quick_get_max);
-
-static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
-{
- unsigned int ret_freq = 0;
-
- if (!cpufreq_driver->get)
- return ret_freq;
-
- ret_freq = cpufreq_driver->get(policy->cpu);
-
- /*
- * Updating inactive policies is invalid, so avoid doing that. Also
- * if fast frequency switching is used with the given policy, the check
- * against policy->cur is pointless, so skip it in that case too.
- */
- if (unlikely(policy_is_inactive(policy)) || policy->fast_switch_enabled)
- return ret_freq;
-
- if (ret_freq && policy->cur &&
- !(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
- /* verify no discrepancy between actual and
- saved value exists */
- if (unlikely(ret_freq != policy->cur)) {
- cpufreq_out_of_sync(policy, ret_freq);
- schedule_work(&policy->update);
- }
- }
-
- return ret_freq;
-}
-
-/**
- * cpufreq_get - get the current CPU frequency (in kHz)
- * @cpu: CPU number
- *
- * Get the CPU current (static) CPU frequency
- */
-unsigned int cpufreq_get(unsigned int cpu)
-{
- struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
- unsigned int ret_freq = 0;
-
- if (policy) {
- down_read(&policy->rwsem);
-
- if (!policy_is_inactive(policy))
- ret_freq = __cpufreq_get(policy);
-
- up_read(&policy->rwsem);
-
- cpufreq_cpu_put(policy);
- }
-
- return ret_freq;
-}
-EXPORT_SYMBOL(cpufreq_get);
-
-static unsigned int cpufreq_update_current_freq(struct cpufreq_policy *policy)
-{
- unsigned int new_freq;
-
- new_freq = cpufreq_driver->get(policy->cpu);
- if (!new_freq)
- return 0;
-
- if (!policy->cur) {
- pr_debug("cpufreq: Driver did not initialize current freq\n");
- policy->cur = new_freq;
- } else if (policy->cur != new_freq && has_target()) {
- cpufreq_out_of_sync(policy, new_freq);
- }
-
- return new_freq;
-}
-
-static struct subsys_interface cpufreq_interface = {
- .name = "cpufreq",
- .subsys = &cpu_subsys,
- .add_dev = cpufreq_add_dev,
- .remove_dev = cpufreq_remove_dev,
-};
-
-/*
- * In case platform wants some specific frequency to be configured
- * during suspend..
- */
-int cpufreq_generic_suspend(struct cpufreq_policy *policy)
-{
- int ret;
-
- if (!policy->suspend_freq) {
- pr_debug("%s: suspend_freq not defined\n", __func__);
- return 0;
- }
-
- pr_debug("%s: Setting suspend-freq: %u\n", __func__,
- policy->suspend_freq);
-
- ret = __cpufreq_driver_target(policy, policy->suspend_freq,
- CPUFREQ_RELATION_H);
- if (ret)
- pr_err("%s: unable to set suspend-freq: %u. err: %d\n",
- __func__, policy->suspend_freq, ret);
-
- return ret;
-}
-EXPORT_SYMBOL(cpufreq_generic_suspend);
-
-/**
- * cpufreq_suspend() - Suspend CPUFreq governors
- *
- * Called during system wide Suspend/Hibernate cycles for suspending governors
- * as some platforms can't change frequency after this point in suspend cycle.
- * Because some of the devices (like: i2c, regulators, etc) they use for
- * changing frequency are suspended quickly after this point.
- */
-void cpufreq_suspend(void)
-{
- struct cpufreq_policy *policy;
-
- if (!cpufreq_driver)
- return;
-
- if (!has_target() && !cpufreq_driver->suspend)
- goto suspend;
-
- pr_debug("%s: Suspending Governors\n", __func__);
-
- for_each_active_policy(policy) {
- if (has_target()) {
- down_write(&policy->rwsem);
- cpufreq_stop_governor(policy);
- up_write(&policy->rwsem);
- }
-
- if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy))
- pr_err("%s: Failed to suspend driver: %p\n", __func__,
- policy);
- }
-
-suspend:
- cpufreq_suspended = true;
-}
-
-/**
- * cpufreq_resume() - Resume CPUFreq governors
- *
- * Called during system wide Suspend/Hibernate cycle for resuming governors that
- * are suspended with cpufreq_suspend().
- */
-void cpufreq_resume(void)
-{
- struct cpufreq_policy *policy;
- int ret;
-
- if (!cpufreq_driver)
- return;
-
- if (unlikely(!cpufreq_suspended))
- return;
-
- cpufreq_suspended = false;
-
- if (!has_target() && !cpufreq_driver->resume)
- return;
-
- pr_debug("%s: Resuming Governors\n", __func__);
-
- for_each_active_policy(policy) {
- if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) {
- pr_err("%s: Failed to resume driver: %p\n", __func__,
- policy);
- } else if (has_target()) {
- down_write(&policy->rwsem);
- ret = cpufreq_start_governor(policy);
- up_write(&policy->rwsem);
-
- if (ret)
- pr_err("%s: Failed to start governor for policy: %p\n",
- __func__, policy);
- }
- }
-}
-
-/**
- * cpufreq_get_current_driver - return current driver's name
- *
- * Return the name string of the currently loaded cpufreq driver
- * or NULL, if none.
- */
-const char *cpufreq_get_current_driver(void)
-{
- if (cpufreq_driver)
- return cpufreq_driver->name;
-
- return NULL;
-}
-EXPORT_SYMBOL_GPL(cpufreq_get_current_driver);
-
-/**
- * cpufreq_get_driver_data - return current driver data
- *
- * Return the private data of the currently loaded cpufreq
- * driver, or NULL if no cpufreq driver is loaded.
- */
-void *cpufreq_get_driver_data(void)
-{
- if (cpufreq_driver)
- return cpufreq_driver->driver_data;
-
- return NULL;
-}
-EXPORT_SYMBOL_GPL(cpufreq_get_driver_data);
-
-/*********************************************************************
- * NOTIFIER LISTS INTERFACE *
- *********************************************************************/
-
-/**
- * cpufreq_register_notifier - register a driver with cpufreq
- * @nb: notifier function to register
- * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
- *
- * Add a driver to one of two lists: either a list of drivers that
- * are notified about clock rate changes (once before and once after
- * the transition), or a list of drivers that are notified about
- * changes in cpufreq policy.
- *
- * This function may sleep, and has the same return conditions as
- * blocking_notifier_chain_register.
- */
-int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
-{
- int ret;
-
- if (cpufreq_disabled())
- return -EINVAL;
-
- WARN_ON(!init_cpufreq_transition_notifier_list_called);
-
- switch (list) {
- case CPUFREQ_TRANSITION_NOTIFIER:
- mutex_lock(&cpufreq_fast_switch_lock);
-
- if (cpufreq_fast_switch_count > 0) {
- mutex_unlock(&cpufreq_fast_switch_lock);
- return -EBUSY;
- }
- ret = srcu_notifier_chain_register(
- &cpufreq_transition_notifier_list, nb);
- if (!ret)
- cpufreq_fast_switch_count--;
-
- mutex_unlock(&cpufreq_fast_switch_lock);
- break;
- case CPUFREQ_POLICY_NOTIFIER:
- ret = blocking_notifier_chain_register(
- &cpufreq_policy_notifier_list, nb);
- break;
- default:
- ret = -EINVAL;
- }
-
- return ret;
-}
-EXPORT_SYMBOL(cpufreq_register_notifier);
-
-/**
- * cpufreq_unregister_notifier - unregister a driver with cpufreq
- * @nb: notifier block to be unregistered
- * @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
- *
- * Remove a driver from the CPU frequency notifier list.
- *
- * This function may sleep, and has the same return conditions as
- * blocking_notifier_chain_unregister.
- */
-int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
-{
- int ret;
-
- if (cpufreq_disabled())
- return -EINVAL;
-
- switch (list) {
- case CPUFREQ_TRANSITION_NOTIFIER:
- mutex_lock(&cpufreq_fast_switch_lock);
-
- ret = srcu_notifier_chain_unregister(
- &cpufreq_transition_notifier_list, nb);
- if (!ret && !WARN_ON(cpufreq_fast_switch_count >= 0))
- cpufreq_fast_switch_count++;
-
- mutex_unlock(&cpufreq_fast_switch_lock);
- break;
- case CPUFREQ_POLICY_NOTIFIER:
- ret = blocking_notifier_chain_unregister(
- &cpufreq_policy_notifier_list, nb);
- break;
- default:
- ret = -EINVAL;
- }
-
- return ret;
-}
-EXPORT_SYMBOL(cpufreq_unregister_notifier);
-
-
-/*********************************************************************
- * GOVERNORS *
- *********************************************************************/
-
-/**
- * cpufreq_driver_fast_switch - Carry out a fast CPU frequency switch.
- * @policy: cpufreq policy to switch the frequency for.
- * @target_freq: New frequency to set (may be approximate).
- *
- * Carry out a fast frequency switch without sleeping.
- *
- * The driver's ->fast_switch() callback invoked by this function must be
- * suitable for being called from within RCU-sched read-side critical sections
- * and it is expected to select the minimum available frequency greater than or
- * equal to @target_freq (CPUFREQ_RELATION_L).
- *
- * This function must not be called if policy->fast_switch_enabled is unset.
- *
- * Governors calling this function must guarantee that it will never be invoked
- * twice in parallel for the same policy and that it will never be called in
- * parallel with either ->target() or ->target_index() for the same policy.
- *
- * Returns the actual frequency set for the CPU.
- *
- * If 0 is returned by the driver's ->fast_switch() callback to indicate an
- * error condition, the hardware configuration must be preserved.
- */
-unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
- unsigned int target_freq)
-{
- target_freq = clamp_val(target_freq, policy->min, policy->max);
-
- return cpufreq_driver->fast_switch(policy, target_freq);
-}
-EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch);
-
-/* Must set freqs->new to intermediate frequency */
-static int __target_intermediate(struct cpufreq_policy *policy,
- struct cpufreq_freqs *freqs, int index)
-{
- int ret;
-
- freqs->new = cpufreq_driver->get_intermediate(policy, index);
-
- /* We don't need to switch to intermediate freq */
- if (!freqs->new)
- return 0;
-
- pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n",
- __func__, policy->cpu, freqs->old, freqs->new);
-
- cpufreq_freq_transition_begin(policy, freqs);
- ret = cpufreq_driver->target_intermediate(policy, index);
- cpufreq_freq_transition_end(policy, freqs, ret);
-
- if (ret)
- pr_err("%s: Failed to change to intermediate frequency: %d\n",
- __func__, ret);
-
- return ret;
-}
-
-static int __target_index(struct cpufreq_policy *policy, int index)
-{
- struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0};
- unsigned int intermediate_freq = 0;
- unsigned int newfreq = policy->freq_table[index].frequency;
- int retval = -EINVAL;
- bool notify;
-
- if (newfreq == policy->cur)
- return 0;
-
- notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION);
- if (notify) {
- /* Handle switching to intermediate frequency */
- if (cpufreq_driver->get_intermediate) {
- retval = __target_intermediate(policy, &freqs, index);
- if (retval)
- return retval;
-
- intermediate_freq = freqs.new;
- /* Set old freq to intermediate */
- if (intermediate_freq)
- freqs.old = freqs.new;
- }
-
- freqs.new = newfreq;
- pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n",
- __func__, policy->cpu, freqs.old, freqs.new);
-
- cpufreq_freq_transition_begin(policy, &freqs);
- }
-
- retval = cpufreq_driver->target_index(policy, index);
- if (retval)
- pr_err("%s: Failed to change cpu frequency: %d\n", __func__,
- retval);
-
- if (notify) {
- cpufreq_freq_transition_end(policy, &freqs, retval);
-
- /*
- * Failed after setting to intermediate freq? Driver should have
- * reverted back to initial frequency and so should we. Check
- * here for intermediate_freq instead of get_intermediate, in
- * case we haven't switched to intermediate freq at all.
- */
- if (unlikely(retval && intermediate_freq)) {
- freqs.old = intermediate_freq;
- freqs.new = policy->restore_freq;
- cpufreq_freq_transition_begin(policy, &freqs);
- cpufreq_freq_transition_end(policy, &freqs, 0);
- }
- }
-
- return retval;
-}
-
-int __cpufreq_driver_target(struct cpufreq_policy *policy,
- unsigned int target_freq,
- unsigned int relation)
-{
- unsigned int old_target_freq = target_freq;
- int index;
-
- if (cpufreq_disabled())
- return -ENODEV;
-
- /* Make sure that target_freq is within supported range */
- target_freq = clamp_val(target_freq, policy->min, policy->max);
-
- pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n",
- policy->cpu, target_freq, relation, old_target_freq);
-
- /*
- * This might look like a redundant call as we are checking it again
- * after finding index. But it is left intentionally for cases where
- * exactly same freq is called again and so we can save on few function
- * calls.
- */
- if (target_freq == policy->cur)
- return 0;
-
- /* Save last value to restore later on errors */
- policy->restore_freq = policy->cur;
-
- if (cpufreq_driver->target)
- return cpufreq_driver->target(policy, target_freq, relation);
-
- if (!cpufreq_driver->target_index)
- return -EINVAL;
-
- index = cpufreq_frequency_table_target(policy, target_freq, relation);
-
- return __target_index(policy, index);
-}
-EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
-
-int cpufreq_driver_target(struct cpufreq_policy *policy,
- unsigned int target_freq,
- unsigned int relation)
-{
- int ret = -EINVAL;
-
- down_write(&policy->rwsem);
-
- ret = __cpufreq_driver_target(policy, target_freq, relation);
-
- up_write(&policy->rwsem);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(cpufreq_driver_target);
-
-__weak struct cpufreq_governor *cpufreq_fallback_governor(void)
-{
- return NULL;
-}
-
-static int cpufreq_init_governor(struct cpufreq_policy *policy)
-{
- int ret;
-
- /* Don't start any governor operations if we are entering suspend */
- if (cpufreq_suspended)
- return 0;
- /*
- * Governor might not be initiated here if ACPI _PPC changed
- * notification happened, so check it.
- */
- if (!policy->governor)
- return -EINVAL;
-
- /* Platform doesn't want dynamic frequency switching ? */
- if (policy->governor->dynamic_switching &&
- cpufreq_driver->flags & CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING) {
- struct cpufreq_governor *gov = cpufreq_fallback_governor();
-
- if (gov) {
- pr_warn("Can't use %s governor as dynamic switching is disallowed. Fallback to %s governor\n",
- policy->governor->name, gov->name);
- policy->governor = gov;
- } else {
- return -EINVAL;
- }
- }
-
- if (!try_module_get(policy->governor->owner))
- return -EINVAL;
-
- pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
-
- if (policy->governor->init) {
- ret = policy->governor->init(policy);
- if (ret) {
- module_put(policy->governor->owner);
- return ret;
- }
- }
-
- return 0;
-}
-
-static void cpufreq_exit_governor(struct cpufreq_policy *policy)
-{
- if (cpufreq_suspended || !policy->governor)
- return;
-
- pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
-
- if (policy->governor->exit)
- policy->governor->exit(policy);
-
- module_put(policy->governor->owner);
-}
-
-static int cpufreq_start_governor(struct cpufreq_policy *policy)
-{
- int ret;
-
- if (cpufreq_suspended)
- return 0;
-
- if (!policy->governor)
- return -EINVAL;
-
- pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
-
- if (cpufreq_driver->get && !cpufreq_driver->setpolicy)
- cpufreq_update_current_freq(policy);
-
- if (policy->governor->start) {
- ret = policy->governor->start(policy);
- if (ret)
- return ret;
- }
-
- if (policy->governor->limits)
- policy->governor->limits(policy);
-
- return 0;
-}
-
-static void cpufreq_stop_governor(struct cpufreq_policy *policy)
-{
- if (cpufreq_suspended || !policy->governor)
- return;
-
- pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
-
- if (policy->governor->stop)
- policy->governor->stop(policy);
-}
-
-static void cpufreq_governor_limits(struct cpufreq_policy *policy)
-{
- if (cpufreq_suspended || !policy->governor)
- return;
-
- pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
-
- if (policy->governor->limits)
- policy->governor->limits(policy);
-}
-
-int cpufreq_register_governor(struct cpufreq_governor *governor)
-{
- int err;
-
- if (!governor)
- return -EINVAL;
-
- if (cpufreq_disabled())
- return -ENODEV;
-
- mutex_lock(&cpufreq_governor_mutex);
-
- err = -EBUSY;
- if (!find_governor(governor->name)) {
- err = 0;
- list_add(&governor->governor_list, &cpufreq_governor_list);
- }
-
- mutex_unlock(&cpufreq_governor_mutex);
- return err;
-}
-EXPORT_SYMBOL_GPL(cpufreq_register_governor);
-
-void cpufreq_unregister_governor(struct cpufreq_governor *governor)
-{
- struct cpufreq_policy *policy;
- unsigned long flags;
-
- if (!governor)
- return;
-
- if (cpufreq_disabled())
- return;
-
- /* clear last_governor for all inactive policies */
- read_lock_irqsave(&cpufreq_driver_lock, flags);
- for_each_inactive_policy(policy) {
- if (!strcmp(policy->last_governor, governor->name)) {
- policy->governor = NULL;
- strcpy(policy->last_governor, "\0");
- }
- }
- read_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- mutex_lock(&cpufreq_governor_mutex);
- list_del(&governor->governor_list);
- mutex_unlock(&cpufreq_governor_mutex);
-}
-EXPORT_SYMBOL_GPL(cpufreq_unregister_governor);
-
-
-/*********************************************************************
- * POLICY INTERFACE *
- *********************************************************************/
-
-/**
- * cpufreq_get_policy - get the current cpufreq_policy
- * @policy: struct cpufreq_policy into which the current cpufreq_policy
- * is written
- *
- * Reads the current cpufreq policy.
- */
-int cpufreq_get_policy(struct cpufreq_policy *policy, unsigned int cpu)
-{
- struct cpufreq_policy *cpu_policy;
- if (!policy)
- return -EINVAL;
-
- cpu_policy = cpufreq_cpu_get(cpu);
- if (!cpu_policy)
- return -EINVAL;
-
- memcpy(policy, cpu_policy, sizeof(*policy));
-
- cpufreq_cpu_put(cpu_policy);
- return 0;
-}
-EXPORT_SYMBOL(cpufreq_get_policy);
-
-/*
- * policy : current policy.
- * new_policy: policy to be set.
- */
-static int cpufreq_set_policy(struct cpufreq_policy *policy,
- struct cpufreq_policy *new_policy)
-{
- struct cpufreq_governor *old_gov;
- int ret;
-
- pr_debug("setting new policy for CPU %u: %u - %u kHz\n",
- new_policy->cpu, new_policy->min, new_policy->max);
-
- memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo));
-
- /*
- * This check works well when we store new min/max freq attributes,
- * because new_policy is a copy of policy with one field updated.
- */
- if (new_policy->min > new_policy->max)
- return -EINVAL;
-
- /* verify the cpu speed can be set within this limit */
- ret = cpufreq_driver->verify(new_policy);
- if (ret)
- return ret;
-
- /* adjust if necessary - all reasons */
- blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
- CPUFREQ_ADJUST, new_policy);
-
- /*
- * verify the cpu speed can be set within this limit, which might be
- * different to the first one
- */
- ret = cpufreq_driver->verify(new_policy);
- if (ret)
- return ret;
-
- /* notification of the new policy */
- blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
- CPUFREQ_NOTIFY, new_policy);
-
- policy->min = new_policy->min;
- policy->max = new_policy->max;
-
- policy->cached_target_freq = UINT_MAX;
-
- pr_debug("new min and max freqs are %u - %u kHz\n",
- policy->min, policy->max);
-
- if (cpufreq_driver->setpolicy) {
- policy->policy = new_policy->policy;
- pr_debug("setting range\n");
- return cpufreq_driver->setpolicy(new_policy);
- }
-
- if (new_policy->governor == policy->governor) {
- pr_debug("cpufreq: governor limits update\n");
- cpufreq_governor_limits(policy);
- return 0;
- }
-
- pr_debug("governor switch\n");
-
- /* save old, working values */
- old_gov = policy->governor;
- /* end old governor */
- if (old_gov) {
- cpufreq_stop_governor(policy);
- cpufreq_exit_governor(policy);
- }
-
- /* start new governor */
- policy->governor = new_policy->governor;
- ret = cpufreq_init_governor(policy);
- if (!ret) {
- ret = cpufreq_start_governor(policy);
- if (!ret) {
- pr_debug("cpufreq: governor change\n");
- return 0;
- }
- cpufreq_exit_governor(policy);
- }
-
- /* new governor failed, so re-start old one */
- pr_debug("starting governor %s failed\n", policy->governor->name);
- if (old_gov) {
- policy->governor = old_gov;
- if (cpufreq_init_governor(policy))
- policy->governor = NULL;
- else
- cpufreq_start_governor(policy);
- }
-
- return ret;
-}
-
-/**
- * cpufreq_update_policy - re-evaluate an existing cpufreq policy
- * @cpu: CPU which shall be re-evaluated
- *
- * Useful for policy notifiers which have different necessities
- * at different times.
- */
-void cpufreq_update_policy(unsigned int cpu)
-{
- struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
- struct cpufreq_policy new_policy;
-
- if (!policy)
- return;
-
- down_write(&policy->rwsem);
-
- if (policy_is_inactive(policy))
- goto unlock;
-
- pr_debug("updating policy for CPU %u\n", cpu);
- memcpy(&new_policy, policy, sizeof(*policy));
- new_policy.min = policy->user_policy.min;
- new_policy.max = policy->user_policy.max;
-
- /*
- * BIOS might change freq behind our back
- * -> ask driver for current freq and notify governors about a change
- */
- if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
- if (cpufreq_suspended)
- goto unlock;
-
- new_policy.cur = cpufreq_update_current_freq(policy);
- if (WARN_ON(!new_policy.cur))
- goto unlock;
- }
-
- cpufreq_set_policy(policy, &new_policy);
-
-unlock:
- up_write(&policy->rwsem);
-
- cpufreq_cpu_put(policy);
-}
-EXPORT_SYMBOL(cpufreq_update_policy);
-
-/*********************************************************************
- * BOOST *
- *********************************************************************/
-static int cpufreq_boost_set_sw(int state)
-{
- struct cpufreq_policy *policy;
- int ret = -EINVAL;
-
- for_each_active_policy(policy) {
- if (!policy->freq_table)
- continue;
-
- ret = cpufreq_frequency_table_cpuinfo(policy,
- policy->freq_table);
- if (ret) {
- pr_err("%s: Policy frequency update failed\n",
- __func__);
- break;
- }
-
- down_write(&policy->rwsem);
- policy->user_policy.max = policy->max;
- cpufreq_governor_limits(policy);
- up_write(&policy->rwsem);
- }
-
- return ret;
-}
-
-int cpufreq_boost_trigger_state(int state)
-{
- unsigned long flags;
- int ret = 0;
-
- if (cpufreq_driver->boost_enabled == state)
- return 0;
-
- write_lock_irqsave(&cpufreq_driver_lock, flags);
- cpufreq_driver->boost_enabled = state;
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- ret = cpufreq_driver->set_boost(state);
- if (ret) {
- write_lock_irqsave(&cpufreq_driver_lock, flags);
- cpufreq_driver->boost_enabled = !state;
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- pr_err("%s: Cannot %s BOOST\n",
- __func__, state ? "enable" : "disable");
- }
-
- return ret;
-}
-
-static bool cpufreq_boost_supported(void)
-{
- return likely(cpufreq_driver) && cpufreq_driver->set_boost;
-}
-
-static int create_boost_sysfs_file(void)
-{
- int ret;
-
- ret = sysfs_create_file(cpufreq_global_kobject, &boost.attr);
- if (ret)
- pr_err("%s: cannot register global BOOST sysfs file\n",
- __func__);
-
- return ret;
-}
-
-static void remove_boost_sysfs_file(void)
-{
- if (cpufreq_boost_supported())
- sysfs_remove_file(cpufreq_global_kobject, &boost.attr);
-}
-
-int cpufreq_enable_boost_support(void)
-{
- if (!cpufreq_driver)
- return -EINVAL;
-
- if (cpufreq_boost_supported())
- return 0;
-
- cpufreq_driver->set_boost = cpufreq_boost_set_sw;
-
- /* This will get removed on driver unregister */
- return create_boost_sysfs_file();
-}
-EXPORT_SYMBOL_GPL(cpufreq_enable_boost_support);
-
-int cpufreq_boost_enabled(void)
-{
- return cpufreq_driver->boost_enabled;
-}
-EXPORT_SYMBOL_GPL(cpufreq_boost_enabled);
-
-/*********************************************************************
- * REGISTER / UNREGISTER CPUFREQ DRIVER *
- *********************************************************************/
-static enum cpuhp_state hp_online;
-
-static int cpuhp_cpufreq_online(unsigned int cpu)
-{
- cpufreq_online(cpu);
-
- return 0;
-}
-
-static int cpuhp_cpufreq_offline(unsigned int cpu)
-{
- cpufreq_offline(cpu);
-
- return 0;
-}
-
-/**
- * cpufreq_register_driver - register a CPU Frequency driver
- * @driver_data: A struct cpufreq_driver containing the values#
- * submitted by the CPU Frequency driver.
- *
- * Registers a CPU Frequency driver to this core code. This code
- * returns zero on success, -EEXIST when another driver got here first
- * (and isn't unregistered in the meantime).
- *
- */
-int cpufreq_register_driver(struct cpufreq_driver *driver_data)
-{
- unsigned long flags;
- int ret;
-
- if (cpufreq_disabled())
- return -ENODEV;
-
- if (!driver_data || !driver_data->verify || !driver_data->init ||
- !(driver_data->setpolicy || driver_data->target_index ||
- driver_data->target) ||
- (driver_data->setpolicy && (driver_data->target_index ||
- driver_data->target)) ||
- (!!driver_data->get_intermediate != !!driver_data->target_intermediate))
- return -EINVAL;
-
- pr_debug("trying to register driver %s\n", driver_data->name);
-
- /* Protect against concurrent CPU online/offline. */
- cpus_read_lock();
-
- write_lock_irqsave(&cpufreq_driver_lock, flags);
- if (cpufreq_driver) {
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
- ret = -EEXIST;
- goto out;
- }
- cpufreq_driver = driver_data;
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
- if (driver_data->setpolicy)
- driver_data->flags |= CPUFREQ_CONST_LOOPS;
-
- if (cpufreq_boost_supported()) {
- ret = create_boost_sysfs_file();
- if (ret)
- goto err_null_driver;
- }
-
- ret = subsys_interface_register(&cpufreq_interface);
- if (ret)
- goto err_boost_unreg;
-
- if (!(cpufreq_driver->flags & CPUFREQ_STICKY) &&
- list_empty(&cpufreq_policy_list)) {
- /* if all ->init() calls failed, unregister */
- ret = -ENODEV;
- pr_debug("%s: No CPU initialized for driver %s\n", __func__,
- driver_data->name);
- goto err_if_unreg;
- }
-
- ret = cpuhp_setup_state_nocalls_cpuslocked(CPUHP_AP_ONLINE_DYN,
- "cpufreq:online",
- cpuhp_cpufreq_online,
- cpuhp_cpufreq_offline);
- if (ret < 0)
- goto err_if_unreg;
- hp_online = ret;
- ret = 0;
-
- pr_debug("driver %s up and running\n", driver_data->name);
- goto out;
-
-err_if_unreg:
- subsys_interface_unregister(&cpufreq_interface);
-err_boost_unreg:
- remove_boost_sysfs_file();
-err_null_driver:
- write_lock_irqsave(&cpufreq_driver_lock, flags);
- cpufreq_driver = NULL;
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-out:
- cpus_read_unlock();
- return ret;
-}
-EXPORT_SYMBOL_GPL(cpufreq_register_driver);
-
-/**
- * cpufreq_unregister_driver - unregister the current CPUFreq driver
- *
- * Unregister the current CPUFreq driver. Only call this if you have
- * the right to do so, i.e. if you have succeeded in initialising before!
- * Returns zero if successful, and -EINVAL if the cpufreq_driver is
- * currently not initialised.
- */
-int cpufreq_unregister_driver(struct cpufreq_driver *driver)
-{
- unsigned long flags;
-
- if (!cpufreq_driver || (driver != cpufreq_driver))
- return -EINVAL;
-
- pr_debug("unregistering driver %s\n", driver->name);
-
- /* Protect against concurrent cpu hotplug */
- cpus_read_lock();
- subsys_interface_unregister(&cpufreq_interface);
- remove_boost_sysfs_file();
- cpuhp_remove_state_nocalls_cpuslocked(hp_online);
-
- write_lock_irqsave(&cpufreq_driver_lock, flags);
-
- cpufreq_driver = NULL;
-
- write_unlock_irqrestore(&cpufreq_driver_lock, flags);
- cpus_read_unlock();
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);
-
-/*
- * Stop cpufreq at shutdown to make sure it isn't holding any locks
- * or mutexes when secondary CPUs are halted.
- */
-static struct syscore_ops cpufreq_syscore_ops = {
- .shutdown = cpufreq_suspend,
-};
-
-struct kobject *cpufreq_global_kobject;
-EXPORT_SYMBOL(cpufreq_global_kobject);
-
-static int __init cpufreq_core_init(void)
-{
- if (cpufreq_disabled())
- return -ENODEV;
-
- cpufreq_global_kobject = kobject_create_and_add("cpufreq", &cpu_subsys.dev_root->kobj);
- BUG_ON(!cpufreq_global_kobject);
-
- register_syscore_ops(&cpufreq_syscore_ops);
-
- return 0;
-}
-module_param(off, int, 0444);
-core_initcall(cpufreq_core_init);
--
2.7.4
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