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authorThomas Renninger <trenn@suse.de>2006-01-27 16:15:26 +0100
committerDave Jones <davej@redhat.com>2006-01-27 10:36:49 -0800
commitc0672860199ac009af7cf198a134ee7a4c3a9bb3 (patch)
tree9b59dfaaf655bacb8380dc8f611f9c2e6e66ca7a /drivers/cpufreq
parent0961dd0d217d072df736d964f47c2b6600931e19 (diff)
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[CPUFREQ] Get rid of userspace policy struct, make userspace gov _PPC safe.
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(-)
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/cpufreq_userspace.c53
1 files changed, 28 insertions, 25 deletions
diff --git a/drivers/cpufreq/cpufreq_userspace.c b/drivers/cpufreq/cpufreq_userspace.c
index 4d6fa63..92a0be2 100644
--- a/drivers/cpufreq/cpufreq_userspace.c
+++ b/drivers/cpufreq/cpufreq_userspace.c
@@ -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);
- 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]);
+ 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(&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);
+ __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);
}
- memcpy (&current_policy[cpu], policy, sizeof(struct cpufreq_policy));
+ else {
+ __cpufreq_driver_target(policy, 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;
mutex_unlock(&userspace_mutex);
break;
}