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Merge back earlier 'pm-cpufreq' material.

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This commit is contained in:
Rafael J. Wysocki 2014-03-06 13:25:59 +01:00
commit 3b4aff0472
5 changed files with 86 additions and 99 deletions
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8
arch/arm64/Kconfig
View File

@ -303,6 +303,14 @@ source "drivers/cpuidle/Kconfig"
endmenu
menu "Power management options"
source "kernel/power/Kconfig"
source "drivers/cpufreq/Kconfig"
endmenu
source "net/Kconfig"
source "drivers/Kconfig"

2
drivers/cpufreq/Kconfig
View File

@ -200,7 +200,7 @@ source "drivers/cpufreq/Kconfig.x86"
endmenu
menu "ARM CPU frequency scaling drivers"
depends on ARM
depends on ARM || ARM64
source "drivers/cpufreq/Kconfig.arm"
endmenu

111
drivers/cpufreq/cpufreq.c
View File

@ -352,7 +352,7 @@ EXPORT_SYMBOL_GPL(cpufreq_notify_post_transition);
/*********************************************************************
* SYSFS INTERFACE *
*********************************************************************/
ssize_t show_boost(struct kobject *kobj,
static ssize_t show_boost(struct kobject *kobj,
struct attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled);
@ -2012,22 +2012,21 @@ EXPORT_SYMBOL(cpufreq_get_policy);
static int cpufreq_set_policy(struct cpufreq_policy *policy,
struct cpufreq_policy *new_policy)
{
int ret = 0, failed = 1;
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));
if (new_policy->min > policy->max || new_policy->max < policy->min) {
ret = -EINVAL;
goto error_out;
}
if (new_policy->min > policy->max || new_policy->max < policy->min)
return -EINVAL;
/* verify the cpu speed can be set within this limit */
ret = cpufreq_driver->verify(new_policy);
if (ret)
goto error_out;
return ret;
/* adjust if necessary - all reasons */
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
@ -2043,7 +2042,7 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
*/
ret = cpufreq_driver->verify(new_policy);
if (ret)
goto error_out;
return ret;
/* notification of the new policy */
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
@ -2058,58 +2057,48 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy,
if (cpufreq_driver->setpolicy) {
policy->policy = new_policy->policy;
pr_debug("setting range\n");
ret = cpufreq_driver->setpolicy(new_policy);
} else {
if (new_policy->governor != policy->governor) {
/* save old, working values */
struct cpufreq_governor *old_gov = policy->governor;
pr_debug("governor switch\n");
/* end old governor */
if (policy->governor) {
__cpufreq_governor(policy, CPUFREQ_GOV_STOP);
up_write(&policy->rwsem);
__cpufreq_governor(policy,
CPUFREQ_GOV_POLICY_EXIT);
down_write(&policy->rwsem);
}
/* start new governor */
policy->governor = new_policy->governor;
if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) {
if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) {
failed = 0;
} else {
up_write(&policy->rwsem);
__cpufreq_governor(policy,
CPUFREQ_GOV_POLICY_EXIT);
down_write(&policy->rwsem);
}
}
if (failed) {
/* 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;
__cpufreq_governor(policy,
CPUFREQ_GOV_POLICY_INIT);
__cpufreq_governor(policy,
CPUFREQ_GOV_START);
}
ret = -EINVAL;
goto error_out;
}
/* might be a policy change, too, so fall through */
}
pr_debug("governor: change or update limits\n");
ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
return cpufreq_driver->setpolicy(new_policy);
}
error_out:
return ret;
if (new_policy->governor == policy->governor)
goto out;
pr_debug("governor switch\n");
/* save old, working values */
old_gov = policy->governor;
/* end old governor */
if (old_gov) {
__cpufreq_governor(policy, CPUFREQ_GOV_STOP);
up_write(&policy->rwsem);
__cpufreq_governor(policy,CPUFREQ_GOV_POLICY_EXIT);
down_write(&policy->rwsem);
}
/* start new governor */
policy->governor = new_policy->governor;
if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) {
if (!__cpufreq_governor(policy, CPUFREQ_GOV_START))
goto out;
up_write(&policy->rwsem);
__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT);
down_write(&policy->rwsem);
}
/* 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;
__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT);
__cpufreq_governor(policy, CPUFREQ_GOV_START);
}
return -EINVAL;
out:
pr_debug("governor: change or update limits\n");
return __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
}
/**
@ -2145,6 +2134,11 @@ int cpufreq_update_policy(unsigned int cpu)
*/
if (cpufreq_driver->get) {
new_policy.cur = cpufreq_driver->get(cpu);
if (WARN_ON(!new_policy.cur)) {
ret = -EIO;
goto no_policy;
}
if (!policy->cur) {
pr_debug("Driver did not initialize current freq");
policy->cur = new_policy.cur;
@ -2181,7 +2175,6 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb,
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_ONLINE:
__cpufreq_add_dev(dev, NULL, frozen);
cpufreq_update_policy(cpu);
break;
case CPU_DOWN_PREPARE:

38
drivers/cpufreq/cpufreq_stats.c
View File

@ -180,27 +180,25 @@ static void cpufreq_stats_free_table(unsigned int cpu)
cpufreq_cpu_put(policy);
}
static int __cpufreq_stats_create_table(struct cpufreq_policy *policy,
struct cpufreq_frequency_table *table)
static int __cpufreq_stats_create_table(struct cpufreq_policy *policy)
{
unsigned int i, j, count = 0, ret = 0;
struct cpufreq_stats *stat;
struct cpufreq_policy *current_policy;
unsigned int alloc_size;
unsigned int cpu = policy->cpu;
struct cpufreq_frequency_table *table;
table = cpufreq_frequency_get_table(cpu);
if (unlikely(!table))
return 0;
if (per_cpu(cpufreq_stats_table, cpu))
return -EBUSY;
stat = kzalloc(sizeof(*stat), GFP_KERNEL);
if ((stat) == NULL)
return -ENOMEM;
current_policy = cpufreq_cpu_get(cpu);
if (current_policy == NULL) {
ret = -EINVAL;
goto error_get_fail;
}
ret = sysfs_create_group(&current_policy->kobj, &stats_attr_group);
ret = sysfs_create_group(&policy->kobj, &stats_attr_group);
if (ret)
goto error_out;
@ -223,7 +221,7 @@ static int __cpufreq_stats_create_table(struct cpufreq_policy *policy,
stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL);
if (!stat->time_in_state) {
ret = -ENOMEM;
goto error_out;
goto error_alloc;
}
stat->freq_table = (unsigned int *)(stat->time_in_state + count);
@ -243,11 +241,10 @@ static int __cpufreq_stats_create_table(struct cpufreq_policy *policy,
stat->last_time = get_jiffies_64();
stat->last_index = freq_table_get_index(stat, policy->cur);
spin_unlock(&cpufreq_stats_lock);
cpufreq_cpu_put(current_policy);
return 0;
error_alloc:
sysfs_remove_group(&policy->kobj, &stats_attr_group);
error_out:
cpufreq_cpu_put(current_policy);
error_get_fail:
kfree(stat);
per_cpu(cpufreq_stats_table, cpu) = NULL;
return ret;
@ -256,7 +253,6 @@ error_get_fail:
static void cpufreq_stats_create_table(unsigned int cpu)
{
struct cpufreq_policy *policy;
struct cpufreq_frequency_table *table;
/*
* "likely(!policy)" because normally cpufreq_stats will be registered
@ -266,9 +262,7 @@ static void cpufreq_stats_create_table(unsigned int cpu)
if (likely(!policy))
return;
table = cpufreq_frequency_get_table(policy->cpu);
if (likely(table))
__cpufreq_stats_create_table(policy, table);
__cpufreq_stats_create_table(policy);
cpufreq_cpu_put(policy);
}
@ -291,20 +285,14 @@ static int cpufreq_stat_notifier_policy(struct notifier_block *nb,
{
int ret = 0;
struct cpufreq_policy *policy = data;
struct cpufreq_frequency_table *table;
unsigned int cpu = policy->cpu;
if (val == CPUFREQ_UPDATE_POLICY_CPU) {
cpufreq_stats_update_policy_cpu(policy);
return 0;
}
table = cpufreq_frequency_get_table(cpu);
if (!table)
return 0;
if (val == CPUFREQ_CREATE_POLICY)
ret = __cpufreq_stats_create_table(policy, table);
ret = __cpufreq_stats_create_table(policy);
else if (val == CPUFREQ_REMOVE_POLICY)
__cpufreq_stats_free_table(policy);

26
drivers/cpufreq/intel_pstate.c
View File

@ -99,8 +99,7 @@ struct cpudata {
u64 prev_aperf;
u64 prev_mperf;
unsigned long long prev_tsc;
int sample_ptr;
struct sample samples[SAMPLE_COUNT];
struct sample sample;
};
static struct cpudata **all_cpu_data;
@ -154,7 +153,7 @@ static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
pid->setpoint = setpoint;
pid->deadband = deadband;
pid->integral = int_tofp(integral);
pid->last_err = setpoint - busy;
pid->last_err = int_tofp(setpoint) - int_tofp(busy);
}
static inline void pid_p_gain_set(struct _pid *pid, int percent)
@ -586,15 +585,14 @@ static inline void intel_pstate_sample(struct cpudata *cpu)
mperf = mperf >> FRAC_BITS;
tsc = tsc >> FRAC_BITS;
cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;
cpu->samples[cpu->sample_ptr].aperf = aperf;
cpu->samples[cpu->sample_ptr].mperf = mperf;
cpu->samples[cpu->sample_ptr].tsc = tsc;
cpu->samples[cpu->sample_ptr].aperf -= cpu->prev_aperf;
cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf;
cpu->samples[cpu->sample_ptr].tsc -= cpu->prev_tsc;
cpu->sample.aperf = aperf;
cpu->sample.mperf = mperf;
cpu->sample.tsc = tsc;
cpu->sample.aperf -= cpu->prev_aperf;
cpu->sample.mperf -= cpu->prev_mperf;
cpu->sample.tsc -= cpu->prev_tsc;
intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]);
intel_pstate_calc_busy(cpu, &cpu->sample);
cpu->prev_aperf = aperf;
cpu->prev_mperf = mperf;
@ -614,7 +612,7 @@ static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
{
int32_t core_busy, max_pstate, current_pstate;
core_busy = cpu->samples[cpu->sample_ptr].core_pct_busy;
core_busy = cpu->sample.core_pct_busy;
max_pstate = int_tofp(cpu->pstate.max_pstate);
current_pstate = int_tofp(cpu->pstate.current_pstate);
core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
@ -648,7 +646,7 @@ static void intel_pstate_timer_func(unsigned long __data)
intel_pstate_sample(cpu);
sample = &cpu->samples[cpu->sample_ptr];
sample = &cpu->sample;
intel_pstate_adjust_busy_pstate(cpu);
@ -729,7 +727,7 @@ static unsigned int intel_pstate_get(unsigned int cpu_num)
cpu = all_cpu_data[cpu_num];
if (!cpu)
return 0;
sample = &cpu->samples[cpu->sample_ptr];
sample = &cpu->sample;
return sample->freq;
}