#include <linux/sysfs.h>
#include <linux/mutex.h>
-#include <asm/uaccess.h>
-
-
/**
* A few values needed by the userspace governor
*/
-static unsigned int cpu_max_freq[NR_CPUS];
-static unsigned int cpu_min_freq[NR_CPUS];
-static unsigned int cpu_cur_freq[NR_CPUS]; /* current CPU freq */
-static unsigned int cpu_set_freq[NR_CPUS]; /* CPU freq desired by userspace */
-static unsigned int cpu_is_managed[NR_CPUS];
+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 DEFINE_MUTEX(userspace_mutex);
+static int cpus_using_userspace_governor;
-#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "userspace", msg)
+#define dprintk(msg...) \
+ cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "userspace", msg)
/* keep track of frequency transitions */
static int
userspace_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
- void *data)
+ void *data)
{
- struct cpufreq_freqs *freq = data;
+ struct cpufreq_freqs *freq = data;
+
+ if (!per_cpu(cpu_is_managed, freq->cpu))
+ return 0;
- dprintk("saving cpu_cur_freq of cpu %u to be %u kHz\n", freq->cpu, freq->new);
- cpu_cur_freq[freq->cpu] = freq->new;
+ dprintk("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;
+ return 0;
}
static struct notifier_block userspace_cpufreq_notifier_block = {
- .notifier_call = userspace_cpufreq_notifier
+ .notifier_call = userspace_cpufreq_notifier
};
/**
* cpufreq_set - set the CPU frequency
+ * @policy: pointer to policy struct where freq is being set
* @freq: target frequency in kHz
- * @cpu: CPU for which the frequency is to be set
*
* Sets the CPU frequency to freq.
*/
-static int cpufreq_set(unsigned int freq, struct cpufreq_policy *policy)
+static int cpufreq_set(struct cpufreq_policy *policy, unsigned int freq)
{
int ret = -EINVAL;
dprintk("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);
mutex_lock(&userspace_mutex);
- if (!cpu_is_managed[policy->cpu])
+ if (!per_cpu(cpu_is_managed, policy->cpu))
goto err;
- cpu_set_freq[policy->cpu] = freq;
+ per_cpu(cpu_set_freq, policy->cpu) = freq;
- if (freq < cpu_min_freq[policy->cpu])
- freq = cpu_min_freq[policy->cpu];
- if (freq > cpu_max_freq[policy->cpu])
- freq = cpu_max_freq[policy->cpu];
+ 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
* cpufreq_driver_target, a deadlock situation might occur:
- * A: cpufreq_set (lock userspace_mutex) -> cpufreq_driver_target(lock policy->lock)
- * B: cpufreq_set_policy(lock policy->lock) -> __cpufreq_governor -> cpufreq_governor_userspace (lock userspace_mutex)
+ * A: cpufreq_set (lock userspace_mutex) ->
+ * cpufreq_driver_target(lock policy->lock)
+ * B: cpufreq_set_policy(lock policy->lock) ->
+ * __cpufreq_governor ->
+ * cpufreq_governor_userspace (lock userspace_mutex)
*/
ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);
}
-/************************** sysfs interface ************************/
-static ssize_t show_speed (struct cpufreq_policy *policy, char *buf)
-{
- return sprintf (buf, "%u\n", cpu_cur_freq[policy->cpu]);
-}
-
-static ssize_t
-store_speed (struct cpufreq_policy *policy, const char *buf, size_t count)
+static ssize_t show_speed(struct cpufreq_policy *policy, char *buf)
{
- unsigned int freq = 0;
- unsigned int ret;
-
- ret = sscanf (buf, "%u", &freq);
- if (ret != 1)
- return -EINVAL;
-
- cpufreq_set(freq, policy);
-
- return count;
+ return sprintf(buf, "%u\n", per_cpu(cpu_cur_freq, policy->cpu));
}
-static struct freq_attr freq_attr_scaling_setspeed =
-{
- .attr = { .name = "scaling_setspeed", .mode = 0644, .owner = THIS_MODULE },
- .show = show_speed,
- .store = store_speed,
-};
-
static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
unsigned int event)
{
return -EINVAL;
BUG_ON(!policy->cur);
mutex_lock(&userspace_mutex);
- rc = sysfs_create_file (&policy->kobj,
- &freq_attr_scaling_setspeed.attr);
- if (rc)
- goto start_out;
-
- cpu_is_managed[cpu] = 1;
- cpu_min_freq[cpu] = policy->min;
- cpu_max_freq[cpu] = policy->max;
- cpu_cur_freq[cpu] = policy->cur;
- cpu_set_freq[cpu] = policy->cur;
- dprintk("managing cpu %u started (%u - %u kHz, currently %u kHz)\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu]);
-start_out:
+
+ if (cpus_using_userspace_governor == 0) {
+ cpufreq_register_notifier(
+ &userspace_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+ cpus_using_userspace_governor++;
+
+ 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;
+ dprintk("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);
- cpu_is_managed[cpu] = 0;
- cpu_min_freq[cpu] = 0;
- cpu_max_freq[cpu] = 0;
- cpu_set_freq[cpu] = 0;
- sysfs_remove_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
+ cpus_using_userspace_governor--;
+ if (cpus_using_userspace_governor == 0) {
+ cpufreq_unregister_notifier(
+ &userspace_cpufreq_notifier_block,
+ CPUFREQ_TRANSITION_NOTIFIER);
+ }
+
+ 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;
dprintk("managing cpu %u stopped\n", cpu);
mutex_unlock(&userspace_mutex);
break;
case CPUFREQ_GOV_LIMITS:
mutex_lock(&userspace_mutex);
- dprintk("limit event for cpu %u: %u - %u kHz,"
+ dprintk("limit event for cpu %u: %u - %u kHz, "
"currently %u kHz, last set to %u kHz\n",
cpu, policy->min, policy->max,
- cpu_cur_freq[cpu], cpu_set_freq[cpu]);
- if (policy->max < cpu_set_freq[cpu]) {
+ per_cpu(cpu_cur_freq, cpu),
+ per_cpu(cpu_set_freq, cpu));
+ if (policy->max < per_cpu(cpu_set_freq, cpu)) {
__cpufreq_driver_target(policy, policy->max,
CPUFREQ_RELATION_H);
- }
- else if (policy->min > cpu_set_freq[cpu]) {
+ } else if (policy->min > per_cpu(cpu_set_freq, cpu)) {
__cpufreq_driver_target(policy, policy->min,
CPUFREQ_RELATION_L);
- }
- else {
- __cpufreq_driver_target(policy, cpu_set_freq[cpu],
+ } else {
+ __cpufreq_driver_target(policy,
+ per_cpu(cpu_set_freq, cpu),
CPUFREQ_RELATION_L);
}
- cpu_min_freq[cpu] = policy->min;
- cpu_max_freq[cpu] = policy->max;
- cpu_cur_freq[cpu] = policy->cur;
+ 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;
}
}
+#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
+static
+#endif
struct cpufreq_governor cpufreq_gov_userspace = {
.name = "userspace",
.governor = cpufreq_governor_userspace,
+ .store_setspeed = cpufreq_set,
+ .show_setspeed = show_speed,
.owner = THIS_MODULE,
};
-EXPORT_SYMBOL(cpufreq_gov_userspace);
static int __init cpufreq_gov_userspace_init(void)
{
- cpufreq_register_notifier(&userspace_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
return cpufreq_register_governor(&cpufreq_gov_userspace);
}
static void __exit cpufreq_gov_userspace_exit(void)
{
cpufreq_unregister_governor(&cpufreq_gov_userspace);
- cpufreq_unregister_notifier(&userspace_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER);
}
-MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>, Russell King <rmk@arm.linux.org.uk>");
-MODULE_DESCRIPTION ("CPUfreq policy governor 'userspace'");
-MODULE_LICENSE ("GPL");
+MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>, "
+ "Russell King <rmk@arm.linux.org.uk>");
+MODULE_DESCRIPTION("CPUfreq policy governor 'userspace'");
+MODULE_LICENSE("GPL");
+#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE
fs_initcall(cpufreq_gov_userspace_init);
+#else
+module_init(cpufreq_gov_userspace_init);
+#endif
module_exit(cpufreq_gov_userspace_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff