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[CPUFREQ] Get rid of userspace policy struct, make userspace gov _PPC safe.

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Userspace governor need not to hold it's own cpufreq_policy,
better make use of the global core policy.
Also fixes a bug in case of frequency changes via _PPC.
Old min/max values have wrongly been passed to __cpufreq_driver_target()
(kind of buffered) and when max freq was available again, only the old
max(normally lowest freq) was still active.

Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>

 cpufreq_userspace.c |   53 +++++++++++++++++++++++++++-------------------------
 1 files changed, 28 insertions(+), 25 deletions(-)
This commit is contained in:
Thomas Renninger 2006-01-27 16:15:26 +01:00 committed by Dave Jones
parent 0961dd0d21
commit c067286019
1 changed files with 28 additions and 25 deletions
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53
drivers/cpufreq/cpufreq_userspace.c
View file

@ -1,3 +1,4 @@
/*
* linux/drivers/cpufreq/cpufreq_userspace.c
*
@ -34,7 +35,6 @@ 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 struct cpufreq_policy current_policy[NR_CPUS];
static DEFINE_MUTEX (userspace_mutex);
@ -65,22 +65,22 @@ static struct notifier_block userspace_cpufreq_notifier_block = {
*
* Sets the CPU frequency to freq.
*/
static int cpufreq_set(unsigned int freq, unsigned int cpu)
static int cpufreq_set(unsigned int freq, struct cpufreq_policy *policy)
{
int ret = -EINVAL;
dprintk("cpufreq_set for cpu %u, freq %u kHz\n", cpu, freq);
dprintk("cpufreq_set for cpu %u, freq %u kHz\n", policy->cpu, freq);
mutex_lock(&userspace_mutex);
if (!cpu_is_managed[cpu])
if (!cpu_is_managed[policy->cpu])
goto err;
cpu_set_freq[cpu] = freq;
cpu_set_freq[policy->cpu] = freq;
if (freq < cpu_min_freq[cpu])
freq = cpu_min_freq[cpu];
if (freq > cpu_max_freq[cpu])
freq = cpu_max_freq[cpu];
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];
/*
* We're safe from concurrent calls to ->target() here
@ -89,8 +89,7 @@ static int cpufreq_set(unsigned int freq, unsigned int cpu)
* 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(&current_policy[cpu], freq,
CPUFREQ_RELATION_L);
ret = __cpufreq_driver_target(policy, freq, CPUFREQ_RELATION_L);
err:
mutex_unlock(&userspace_mutex);
@ -114,7 +113,7 @@ store_speed (struct cpufreq_policy *policy, const char *buf, size_t count)
if (ret != 1)
return -EINVAL;
cpufreq_set(freq, policy->cpu);
cpufreq_set(freq, policy);
return count;
}
@ -142,7 +141,6 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
cpu_cur_freq[cpu] = policy->cur;
cpu_set_freq[cpu] = policy->cur;
sysfs_create_file (&policy->kobj, &freq_attr_scaling_setspeed.attr);
memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
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]);
mutex_unlock(&userspace_mutex);
break;
@ -158,20 +156,25 @@ static int cpufreq_governor_userspace(struct cpufreq_policy *policy,
break;
case CPUFREQ_GOV_LIMITS:
mutex_lock(&userspace_mutex);
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]) {
__cpufreq_driver_target(policy, policy->max,
CPUFREQ_RELATION_H);
}
else if (policy->min > cpu_set_freq[cpu]) {
__cpufreq_driver_target(policy, policy->min,
CPUFREQ_RELATION_L);
}
else {
__cpufreq_driver_target(policy, cpu_set_freq[cpu],
CPUFREQ_RELATION_L);
}
cpu_min_freq[cpu] = policy->min;
cpu_max_freq[cpu] = policy->max;
dprintk("limit event for cpu %u: %u - %u kHz, currently %u kHz, last set to %u kHz\n", cpu, cpu_min_freq[cpu], cpu_max_freq[cpu], cpu_cur_freq[cpu], cpu_set_freq[cpu]);
if (policy->max < cpu_set_freq[cpu]) {
__cpufreq_driver_target(&current_policy[cpu], policy->max,
CPUFREQ_RELATION_H);
} else if (policy->min > cpu_set_freq[cpu]) {
__cpufreq_driver_target(&current_policy[cpu], policy->min,
CPUFREQ_RELATION_L);
} else {
__cpufreq_driver_target(&current_policy[cpu], cpu_set_freq[cpu],
CPUFREQ_RELATION_L);
}
memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
cpu_cur_freq[cpu] = policy->cur;
mutex_unlock(&userspace_mutex);
break;
}