[CPUFREQ] Cleanup locking in conservative governor

Redesign the locking inside conservative driver. Make dbs_mutex handle all the
global state changes inside the driver and invent a new percpu mutex
to serialize percpu timer and frequency limit change.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 13 insertions, 21 deletions

diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 58889f26029a..57490502b21c 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -63,7 +63,12 @@ struct cpu_dbs_info_s {
         unsigned int down_skip;
         unsigned int requested_freq;
         int cpu;
-        unsigned int enable:1;
+        /*
+         * percpu mutex that serializes governor limit change with
+         * do_dbs_timer invocation. We do not want do_dbs_timer to run
+         * when user is changing the governor or limits.
+         */
+        struct mutex timer_mutex;
 };
 static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
 
@@ -71,9 +76,7 @@ static unsigned int dbs_enable;	/* number of CPUs using this policy */
 
 /*
  * dbs_mutex protects data in dbs_tuners_ins from concurrent changes on
- * different CPUs. It protects dbs_enable in governor start/stop. It also
- * serializes governor limit_change with do_dbs_timer. We do not want
- * do_dbs_timer to run when user is changing the governor or limits.
+ * different CPUs. It protects dbs_enable in governor start/stop.
  */
 static DEFINE_MUTEX(dbs_mutex);
 
@@ -138,9 +141,6 @@ dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
 
         struct cpufreq_policy *policy;
 
-        if (!this_dbs_info->enable)
-                return 0;
-
         policy = this_dbs_info->cur_policy;
 
         /*
@@ -483,17 +483,12 @@ static void do_dbs_timer(struct work_struct *work)
 
         delay -= jiffies % delay;
 
-        mutex_lock(&dbs_mutex);
-
-        if (!dbs_info->enable) {
-                mutex_unlock(&dbs_mutex);
-                return;
-        }
+        mutex_lock(&dbs_info->timer_mutex);
 
         dbs_check_cpu(dbs_info);
 
         queue_delayed_work_on(cpu, kconservative_wq, &dbs_info->work, delay);
-        mutex_unlock(&dbs_mutex);
+        mutex_unlock(&dbs_info->timer_mutex);
 }
 
 static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
@@ -502,7 +497,6 @@ static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
         int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
         delay -= jiffies % delay;
 
-        dbs_info->enable = 1;
         INIT_DELAYED_WORK_DEFERRABLE(&dbs_info->work, do_dbs_timer);
         queue_delayed_work_on(dbs_info->cpu, kconservative_wq, &dbs_info->work,
                                 delay);
@@ -510,7 +504,6 @@ static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
 
 static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
 {
-        dbs_info->enable = 0;
         cancel_delayed_work_sync(&dbs_info->work);
 }
 
@@ -529,9 +522,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                 if ((!cpu_online(cpu)) || (!policy->cur))
                         return -EINVAL;
 
-                if (this_dbs_info->enable) /* Already enabled */
-                        break;
-
                 mutex_lock(&dbs_mutex);
 
                 rc = sysfs_create_group(&policy->kobj, &dbs_attr_group);
@@ -555,6 +545,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                 this_dbs_info->down_skip = 0;
                 this_dbs_info->requested_freq = policy->cur;
 
+                mutex_init(&this_dbs_info->timer_mutex);
                 dbs_enable++;
                 /*
                  * Start the timerschedule work, when this governor
@@ -596,6 +587,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                 mutex_lock(&dbs_mutex);
                 sysfs_remove_group(&policy->kobj, &dbs_attr_group);
                 dbs_enable--;
+                mutex_destroy(&this_dbs_info->timer_mutex);
 
                 /*
                  * Stop the timerschedule work, when this governor
@@ -611,7 +603,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                 break;
 
         case CPUFREQ_GOV_LIMITS:
-                mutex_lock(&dbs_mutex);
+                mutex_lock(&this_dbs_info->timer_mutex);
                 if (policy->max < this_dbs_info->cur_policy->cur)
                         __cpufreq_driver_target(
                                         this_dbs_info->cur_policy,
@@ -620,7 +612,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                         __cpufreq_driver_target(
                                         this_dbs_info->cur_policy,
                                         policy->min, CPUFREQ_RELATION_L);
-                mutex_unlock(&dbs_mutex);
+                mutex_unlock(&this_dbs_info->timer_mutex);
 
                 break;
         }