}
/* 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 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
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_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);
/*********************************************************************
* SYSFS INTERFACE *
return 0;
down_write(&policy->rwsem);
- if (has_target()) {
- ret = cpufreq_governor(policy, CPUFREQ_GOV_STOP);
- if (ret) {
- pr_err("%s: Failed to stop governor\n", __func__);
- goto unlock;
- }
- }
+ if (has_target())
+ cpufreq_stop_governor(policy);
cpumask_set_cpu(cpu, policy->cpus);
if (ret)
pr_err("%s: Failed to start governor\n", __func__);
}
-
-unlock:
up_write(&policy->rwsem);
return ret;
}
CPUFREQ_REMOVE_POLICY, policy);
down_write(&policy->rwsem);
+ cpufreq_stats_free_table(policy);
cpufreq_remove_dev_symlink(policy);
kobj = &policy->kobj;
cmp = &policy->kobj_unregister;
}
}
- 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",
*/
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);
- } else {
- /*
- * 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.
- */
- struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
+ if (cpu_online(cpu))
+ return cpufreq_online(cpu);
- ret = policy && !cpumask_test_and_set_cpu(cpu, policy->real_cpus)
- ? add_cpu_dev_symlink(policy, cpu) : 0;
- }
+ /*
+ * 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.
+ */
+ policy = per_cpu(cpufreq_cpu_data, cpu);
+ if (!policy || cpumask_test_and_set_cpu(cpu, policy->real_cpus))
+ return 0;
- return ret;
+ return add_cpu_dev_symlink(policy, cpu);
}
static void cpufreq_offline(unsigned int cpu)
}
down_write(&policy->rwsem);
- if (has_target()) {
- ret = cpufreq_governor(policy, CPUFREQ_GOV_STOP);
- if (ret)
- pr_err("%s: Failed to stop governor\n", __func__);
- }
+ if (has_target())
+ cpufreq_stop_governor(policy);
cpumask_clear_cpu(cpu, policy->cpus);
if (cpufreq_driver->stop_cpu)
cpufreq_driver->stop_cpu(policy);
- /* If cpu is last user of policy, free policy */
- if (has_target()) {
- ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
- if (ret)
- pr_err("%s: Failed to exit governor\n", __func__);
- }
+ if (has_target())
+ cpufreq_exit_governor(policy);
/*
* Perform the ->exit() even during light-weight tear-down,
ret_freq = cpufreq_driver->get(policy->cpu);
- /* Updating inactive policies is invalid, so avoid doing that. */
- if (unlikely(policy_is_inactive(policy)))
+ /*
+ * 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 &&
void cpufreq_suspend(void)
{
struct cpufreq_policy *policy;
- int ret;
if (!cpufreq_driver)
return;
for_each_active_policy(policy) {
if (has_target()) {
down_write(&policy->rwsem);
- ret = cpufreq_governor(policy, CPUFREQ_GOV_STOP);
+ cpufreq_stop_governor(policy);
up_write(&policy->rwsem);
-
- if (ret) {
- pr_err("%s: Failed to stop governor for policy: %p\n",
- __func__, policy);
- continue;
- }
}
if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy))
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(
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(
* 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.
+ *
+ * If CPUFREQ_ENTRY_INVALID 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)
+{
+ 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)
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);
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 (!ret) {
- if (event == CPUFREQ_GOV_POLICY_INIT)
- policy->governor->initialized++;
- else if (event == CPUFREQ_GOV_POLICY_EXIT)
- policy->governor->initialized--;
+ if (policy->governor->init) {
+ ret = policy->governor->init(policy);
+ if (ret) {
+ module_put(policy->governor->owner);
+ return ret;
+ }
}
- if (((event == CPUFREQ_GOV_POLICY_INIT) && ret) ||
- ((event == CPUFREQ_GOV_POLICY_EXIT) && !ret))
- module_put(policy->governor->owner);
+ return 0;
+}
+
+static void cpufreq_exit_governor(struct cpufreq_policy *policy)
+{
+ if (cpufreq_suspended || !policy->governor)
+ return;
- return ret;
+ 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;
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");
old_gov = policy->governor;
/* end old governor */
if (old_gov) {
- ret = cpufreq_governor(policy, CPUFREQ_GOV_STOP);
- if (ret) {
- /* This can happen due to race with other operations */
- pr_debug("%s: Failed to Stop Governor: %s (%d)\n",
- __func__, old_gov->name, ret);
- return ret;
- }
-
- ret = cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
- if (ret) {
- pr_err("%s: Failed to Exit Governor: %s (%d)\n",
- __func__, old_gov->name, ret);
- return ret;
- }
+ cpufreq_stop_governor(policy);
+ cpufreq_exit_governor(policy);
}
/* 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("cpufreq: governor change\n");
return 0;
}
- cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
+ 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_governor(policy, CPUFREQ_GOV_POLICY_INIT))
+ if (cpufreq_init_governor(policy))
policy->governor = NULL;
else
cpufreq_start_governor(policy);
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_ONLINE:
+ case CPU_DOWN_FAILED:
cpufreq_online(cpu);
break;
case CPU_DOWN_PREPARE:
cpufreq_offline(cpu);
break;
-
- case CPU_DOWN_FAILED:
- cpufreq_online(cpu);
- break;
}
return NOTIFY_OK;
}
down_write(&policy->rwsem);
policy->user_policy.max = policy->max;
- cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+ cpufreq_governor_limits(policy);
up_write(&policy->rwsem);
}
}
register_hotcpu_notifier(&cpufreq_cpu_notifier);
pr_debug("driver %s up and running\n", driver_data->name);
-
-out:
- put_online_cpus();
- return ret;
+ goto out;
err_if_unreg:
subsys_interface_unregister(&cpufreq_interface);
write_lock_irqsave(&cpufreq_driver_lock, flags);
cpufreq_driver = NULL;
write_unlock_irqrestore(&cpufreq_driver_lock, flags);
- goto out;
+out:
+ put_online_cpus();
+ return ret;
}
EXPORT_SYMBOL_GPL(cpufreq_register_driver);
projects / cascardo / linux.git / blobdiff