}
/* internal prototypes */
-static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event);
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 inline void cpufreq_exit_governor(struct cpufreq_policy *policy)
-{
- (void)cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
-}
-
-static inline void cpufreq_stop_governor(struct cpufreq_policy *policy)
-{
- (void)cpufreq_governor(policy, CPUFREQ_GOV_STOP);
-}
+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
}
EXPORT_SYMBOL_GPL(get_governor_parent_kobj);
-struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu)
-{
- struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
-
- return policy && !policy_is_inactive(policy) ?
- policy->freq_table : NULL;
-}
-EXPORT_SYMBOL_GPL(cpufreq_frequency_get_table);
-
static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
{
u64 idle_time;
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))
}
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);
+
/*********************************************************************
* SYSFS INTERFACE *
*********************************************************************/
.release = cpufreq_sysfs_release,
};
-static int add_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu)
+static int add_cpu_dev_symlink(struct cpufreq_policy *policy,
+ struct device *dev)
{
- struct device *cpu_dev;
-
- pr_debug("%s: Adding symlink for CPU: %u\n", __func__, cpu);
-
- if (!policy)
- return 0;
-
- cpu_dev = get_cpu_device(cpu);
- if (WARN_ON(!cpu_dev))
- return 0;
-
- return sysfs_create_link(&cpu_dev->kobj, &policy->kobj, "cpufreq");
+ dev_dbg(dev, "%s: Adding symlink\n", __func__);
+ return sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq");
}
-static void remove_cpu_dev_symlink(struct cpufreq_policy *policy, int cpu)
+static void remove_cpu_dev_symlink(struct cpufreq_policy *policy,
+ struct device *dev)
{
- struct device *cpu_dev;
-
- pr_debug("%s: Removing symlink for CPU: %u\n", __func__, cpu);
-
- cpu_dev = get_cpu_device(cpu);
- if (WARN_ON(!cpu_dev))
- return;
-
- sysfs_remove_link(&cpu_dev->kobj, "cpufreq");
-}
-
-/* Add/remove symlinks for all related CPUs */
-static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy)
-{
- unsigned int j;
- int ret = 0;
-
- /* Some related CPUs might not be present (physically hotplugged) */
- for_each_cpu(j, policy->real_cpus) {
- ret = add_cpu_dev_symlink(policy, j);
- if (ret)
- break;
- }
-
- return ret;
-}
-
-static void cpufreq_remove_dev_symlink(struct cpufreq_policy *policy)
-{
- unsigned int j;
-
- /* Some related CPUs might not be present (physically hotplugged) */
- for_each_cpu(j, policy->real_cpus)
- remove_cpu_dev_symlink(policy, j);
+ dev_dbg(dev, "%s: Removing symlink\n", __func__);
+ sysfs_remove_link(&dev->kobj, "cpufreq");
}
static int cpufreq_add_dev_interface(struct cpufreq_policy *policy)
return ret;
}
- return cpufreq_add_dev_symlink(policy);
+ return 0;
}
__weak struct cpufreq_governor *cpufreq_default_governor(void)
static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
{
- struct device *dev = get_cpu_device(cpu);
struct cpufreq_policy *policy;
int ret;
- if (WARN_ON(!dev))
- return NULL;
-
policy = kzalloc(sizeof(*policy), GFP_KERNEL);
if (!policy)
return NULL;
CPUFREQ_REMOVE_POLICY, policy);
down_write(&policy->rwsem);
- cpufreq_remove_dev_symlink(policy);
+ cpufreq_stats_free_table(policy);
kobj = &policy->kobj;
cmp = &policy->kobj_unregister;
up_write(&policy->rwsem);
if (new_policy) {
/* related_cpus should at least include policy->cpus. */
cpumask_copy(policy->related_cpus, policy->cpus);
- /* Remember CPUs present at the policy creation time. */
- cpumask_and(policy->real_cpus, policy->cpus, cpu_present_mask);
+ /* Clear mask of registered CPUs */
+ cpumask_clear(policy->real_cpus);
}
/*
}
}
- blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
- CPUFREQ_START, policy);
-
if (new_policy) {
ret = cpufreq_add_dev_interface(policy);
if (ret)
goto out_exit_policy;
+
+ cpufreq_stats_create_table(policy);
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_CREATE_POLICY, policy);
write_unlock_irqrestore(&cpufreq_driver_lock, flags);
}
+ blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+ CPUFREQ_START, policy);
+
ret = cpufreq_init_policy(policy);
if (ret) {
pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n",
return ret;
}
+static int cpufreq_offline(unsigned int cpu);
+
/**
* cpufreq_add_dev - the cpufreq interface for a CPU device.
* @dev: CPU device.
{
struct cpufreq_policy *policy;
unsigned cpu = dev->id;
+ int ret;
dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu);
- if (cpu_online(cpu))
- return cpufreq_online(cpu);
+ if (cpu_online(cpu)) {
+ ret = cpufreq_online(cpu);
+ if (ret)
+ return ret;
+ }
- /*
- * A hotplug notifier will follow and we will handle it as CPU online
- * then. For now, just create the sysfs link, unless there is no policy
- * or the link is already present.
- */
+ /* Create sysfs link on CPU registration */
policy = per_cpu(cpufreq_cpu_data, cpu);
if (!policy || cpumask_test_and_set_cpu(cpu, policy->real_cpus))
return 0;
- return add_cpu_dev_symlink(policy, cpu);
+ ret = add_cpu_dev_symlink(policy, dev);
+ if (ret) {
+ cpumask_clear_cpu(cpu, policy->real_cpus);
+ cpufreq_offline(cpu);
+ }
+
+ return ret;
}
-static void cpufreq_offline(unsigned int cpu)
+static int cpufreq_offline(unsigned int cpu)
{
struct cpufreq_policy *policy;
int ret;
policy = cpufreq_cpu_get_raw(cpu);
if (!policy) {
pr_debug("%s: No cpu_data found\n", __func__);
- return;
+ return 0;
}
down_write(&policy->rwsem);
unlock:
up_write(&policy->rwsem);
+ return 0;
}
/**
cpufreq_offline(cpu);
cpumask_clear_cpu(cpu, policy->real_cpus);
- remove_cpu_dev_symlink(policy, cpu);
+ remove_cpu_dev_symlink(policy, dev);
if (cpumask_empty(policy->real_cpus))
cpufreq_policy_free(policy, true);
{
unsigned int new_freq;
- if (cpufreq_suspended)
- return 0;
-
new_freq = cpufreq_driver->get(policy->cpu);
if (!new_freq)
return 0;
return ret;
}
-static int __target_index(struct cpufreq_policy *policy,
- struct cpufreq_frequency_table *freq_table, int index)
+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 */
freqs.old = freqs.new;
}
- freqs.new = freq_table[index].frequency;
+ freqs.new = newfreq;
pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n",
__func__, policy->cpu, freqs.old, freqs.new);
unsigned int relation)
{
unsigned int old_target_freq = target_freq;
- struct cpufreq_frequency_table *freq_table;
- int index, retval;
+ int index;
if (cpufreq_disabled())
return -ENODEV;
/* Make sure that target_freq is within supported range */
- if (target_freq > policy->max)
- target_freq = policy->max;
- if (target_freq < policy->min)
- target_freq = policy->min;
+ 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);
if (!cpufreq_driver->target_index)
return -EINVAL;
- freq_table = cpufreq_frequency_get_table(policy->cpu);
- if (unlikely(!freq_table)) {
- pr_err("%s: Unable to find freq_table\n", __func__);
- return -EINVAL;
- }
-
- retval = cpufreq_frequency_table_target(policy, freq_table, target_freq,
- relation, &index);
- if (unlikely(retval)) {
- pr_err("%s: Unable to find matching freq\n", __func__);
- return retval;
- }
-
- if (freq_table[index].frequency == policy->cur)
- return 0;
+ index = cpufreq_frequency_table_target(policy, target_freq, relation);
- return __target_index(policy, freq_table, index);
+ return __target_index(policy, index);
}
EXPORT_SYMBOL_GPL(__cpufreq_driver_target);
return NULL;
}
-static int cpufreq_governor(struct cpufreq_policy *policy, unsigned int event)
+static int cpufreq_init_governor(struct cpufreq_policy *policy)
{
int ret;
}
}
- if (event == CPUFREQ_GOV_POLICY_INIT)
- if (!try_module_get(policy->governor->owner))
- return -EINVAL;
-
- pr_debug("%s: for CPU %u, event %u\n", __func__, policy->cpu, event);
+ if (!try_module_get(policy->governor->owner))
+ return -EINVAL;
- ret = policy->governor->governor(policy, event);
+ pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
- if (event == CPUFREQ_GOV_POLICY_INIT) {
- if (ret)
+ if (policy->governor->init) {
+ ret = policy->governor->init(policy);
+ if (ret) {
module_put(policy->governor->owner);
- else
- policy->governor->initialized++;
- } else if (event == CPUFREQ_GOV_POLICY_EXIT) {
- policy->governor->initialized--;
- module_put(policy->governor->owner);
+ return ret;
+ }
}
- 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);
- ret = cpufreq_governor(policy, CPUFREQ_GOV_START);
- return ret ? ret : cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+ 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)
mutex_lock(&cpufreq_governor_mutex);
- governor->initialized = 0;
err = -EBUSY;
if (!find_governor(governor->name)) {
err = 0;
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 (new_policy->governor == policy->governor) {
pr_debug("cpufreq: governor limits update\n");
- return cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+ cpufreq_governor_limits(policy);
+ return 0;
}
pr_debug("governor switch\n");
/* start new governor */
policy->governor = new_policy->governor;
- ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT);
+ ret = cpufreq_init_governor(policy);
if (!ret) {
ret = cpufreq_start_governor(policy);
if (!ret) {
pr_debug("starting governor %s failed\n", policy->governor->name);
if (old_gov) {
policy->governor = old_gov;
- if (cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT))
+ if (cpufreq_init_governor(policy))
policy->governor = NULL;
else
cpufreq_start_governor(policy);
}
EXPORT_SYMBOL(cpufreq_update_policy);
-static int cpufreq_cpu_callback(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
-
- switch (action & ~CPU_TASKS_FROZEN) {
- case CPU_ONLINE:
- case CPU_DOWN_FAILED:
- cpufreq_online(cpu);
- break;
-
- case CPU_DOWN_PREPARE:
- cpufreq_offline(cpu);
- break;
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block __refdata cpufreq_cpu_notifier = {
- .notifier_call = cpufreq_cpu_callback,
-};
-
/*********************************************************************
* BOOST *
*********************************************************************/
static int cpufreq_boost_set_sw(int state)
{
- struct cpufreq_frequency_table *freq_table;
struct cpufreq_policy *policy;
int ret = -EINVAL;
for_each_active_policy(policy) {
- freq_table = cpufreq_frequency_get_table(policy->cpu);
- if (freq_table) {
- ret = cpufreq_frequency_table_cpuinfo(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(policy, CPUFREQ_GOV_LIMITS);
- up_write(&policy->rwsem);
+ 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;
/*********************************************************************
* REGISTER / UNREGISTER CPUFREQ DRIVER *
*********************************************************************/
+static enum cpuhp_state hp_online;
/**
* cpufreq_register_driver - register a CPU Frequency driver
goto err_if_unreg;
}
- register_hotcpu_notifier(&cpufreq_cpu_notifier);
+ ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "cpufreq:online",
+ cpufreq_online,
+ 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;
get_online_cpus();
subsys_interface_unregister(&cpufreq_interface);
remove_boost_sysfs_file();
- unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
+ cpuhp_remove_state_nocalls(hp_online);
write_lock_irqsave(&cpufreq_driver_lock, flags);
projects / cascardo / linux.git / blobdiff