summaryrefslogtreecommitdiff
path: root/drivers/cpufreq/cpufreq_userspace.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/cpufreq/cpufreq_userspace.c')
-rw-r--r--drivers/cpufreq/cpufreq_userspace.c112
1 files changed, 12 insertions, 100 deletions
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index bbeb9c0720a6..03078090b5f7 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -13,55 +13,13 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/smp.h>
-#include <linux/init.h>
-#include <linux/spinlock.h>
-#include <linux/interrupt.h>
#include <linux/cpufreq.h>
-#include <linux/cpu.h>
-#include <linux/types.h>
-#include <linux/fs.h>
-#include <linux/sysfs.h>
+#include <linux/init.h>
+#include <linux/module.h>
#include <linux/mutex.h>
-/**
- * A few values needed by the userspace governor
- */
-static DEFINE_PER_CPU(unsigned int, cpu_max_freq);
-static DEFINE_PER_CPU(unsigned int, cpu_min_freq);
-static DEFINE_PER_CPU(unsigned int, cpu_cur_freq); /* current CPU freq */
-static DEFINE_PER_CPU(unsigned int, cpu_set_freq); /* CPU freq desired by
- userspace */
static DEFINE_PER_CPU(unsigned int, cpu_is_managed);
-
static DEFINE_MUTEX(userspace_mutex);
-static int cpus_using_userspace_governor;
-
-/* keep track of frequency transitions */
-static int
-userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
- void *data)
-{
- struct cpufreq_freqs *freq = data;
-
- if (!per_cpu(cpu_is_managed, freq->cpu))
- return 0;
-
- if (val == CPUFREQ_POSTCHANGE) {
- pr_debug("saving cpu_cur_freq of cpu %u to be %u kHz\n",
- freq->cpu, freq->new);
- per_cpu(cpu_cur_freq, freq->cpu) = freq->new;
- }
-
- return 0;
-}
-
-static struct notifier_block userspace_cpufreq_notifier_block = {
- .notifier_call = userspace_cpufreq_notifier
-};
-
/**
* cpufreq_set - set the CPU frequency
@@ -80,13 +38,6 @@ static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
if (!per_cpu(cpu_is_managed, policy->cpu))
goto err;
- per_cpu(cpu_set_freq, policy->cpu) = freq;
-
- if (freq < per_cpu(cpu_min_freq, policy->cpu))
- freq = per_cpu(cpu_min_freq, policy->cpu);
- if (freq > per_cpu(cpu_max_freq, policy->cpu))
- freq = per_cpu(cpu_max_freq, policy->cpu);
-
/*
* We're safe from concurrent calls to ->target() here
* as we hold the userspace_mutex lock. If we were calling
@@ -104,10 +55,9 @@ static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
return ret;
}
-
static ssize_t show_speed(struct cpufreq_policy *policy, char *buf)
{
- return sprintf(buf, "%u\n", per_cpu(cpu_cur_freq, policy->cpu));
+ return sprintf(buf, "%u\n", policy->cur);
}
static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
@@ -119,73 +69,37 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
switch (event) {
case CPUFREQ_GOV_START:
BUG_ON(!policy->cur);
- mutex_lock(&userspace_mutex);
-
- if (cpus_using_userspace_governor == 0) {
- cpufreq_register_notifier(
- &userspace_cpufreq_notifier_block,
- CPUFREQ_TRANSITION_NOTIFIER);
- }
- cpus_using_userspace_governor++;
+ pr_debug("started managing cpu %u\n", cpu);
+ mutex_lock(&userspace_mutex);
per_cpu(cpu_is_managed, cpu) = 1;
- per_cpu(cpu_min_freq, cpu) = policy->min;
- per_cpu(cpu_max_freq, cpu) = policy->max;
- per_cpu(cpu_cur_freq, cpu) = policy->cur;
- per_cpu(cpu_set_freq, cpu) = policy->cur;
- pr_debug("managing cpu %u started "
- "(%u - %u kHz, currently %u kHz)\n",
- cpu,
- per_cpu(cpu_min_freq, cpu),
- per_cpu(cpu_max_freq, cpu),
- per_cpu(cpu_cur_freq, cpu));
-
mutex_unlock(&userspace_mutex);
break;
case CPUFREQ_GOV_STOP:
- mutex_lock(&userspace_mutex);
- cpus_using_userspace_governor--;
- if (cpus_using_userspace_governor == 0) {
- cpufreq_unregister_notifier(
- &userspace_cpufreq_notifier_block,
- CPUFREQ_TRANSITION_NOTIFIER);
- }
+ pr_debug("managing cpu %u stopped\n", cpu);
+ mutex_lock(&userspace_mutex);
per_cpu(cpu_is_managed, cpu) = 0;
- per_cpu(cpu_min_freq, cpu) = 0;
- per_cpu(cpu_max_freq, cpu) = 0;
- per_cpu(cpu_set_freq, cpu) = 0;
- pr_debug("managing cpu %u stopped\n", cpu);
mutex_unlock(&userspace_mutex);
break;
case CPUFREQ_GOV_LIMITS:
mutex_lock(&userspace_mutex);
- pr_debug("limit event for cpu %u: %u - %u kHz, "
- "currently %u kHz, last set to %u kHz\n",
+ pr_debug("limit event for cpu %u: %u - %u kHz, currently %u kHz\n",
cpu, policy->min, policy->max,
- per_cpu(cpu_cur_freq, cpu),
- per_cpu(cpu_set_freq, cpu));
- if (policy->max < per_cpu(cpu_set_freq, cpu)) {
+ policy->cur);
+
+ if (policy->max < policy->cur)
__cpufreq_driver_target(policy, policy->max,
CPUFREQ_RELATION_H);
- } else if (policy->min > per_cpu(cpu_set_freq, cpu)) {
+ else if (policy->min > policy->cur)
__cpufreq_driver_target(policy, policy->min,
CPUFREQ_RELATION_L);
- } else {
- __cpufreq_driver_target(policy,
- per_cpu(cpu_set_freq, cpu),
- CPUFREQ_RELATION_L);
- }
- per_cpu(cpu_min_freq, cpu) = policy->min;
- per_cpu(cpu_max_freq, cpu) = policy->max;
- per_cpu(cpu_cur_freq, cpu) = policy->cur;
mutex_unlock(&userspace_mutex);
break;
}
return rc;
}
-
#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
static
#endif
@@ -202,13 +116,11 @@ static int __init cpufreq_gov_userspace_init(void)
return cpufreq_register_governor(&cpufreq_gov_userspace);
}
-
static void __exit cpufreq_gov_userspace_exit(void)
{
cpufreq_unregister_governor(&cpufreq_gov_userspace);
}
-
MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>, "
"Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("CPUfreq policy governor 'userspace'");