1 files changed, 199 insertions, 19 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 8d19f7c06010..08ca8c9f41cd 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -39,7 +39,7 @@ static struct cpufreq_driver *cpufreq_driver;
 static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
 static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data_fallback);
 static DEFINE_RWLOCK(cpufreq_driver_lock);
-static DEFINE_MUTEX(cpufreq_governor_lock);
+DEFINE_MUTEX(cpufreq_governor_lock);
 static LIST_HEAD(cpufreq_policy_list);
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -176,6 +176,20 @@ int cpufreq_generic_init(struct cpufreq_policy *policy,
 }
 EXPORT_SYMBOL_GPL(cpufreq_generic_init);
 
+unsigned int cpufreq_generic_get(unsigned int cpu)
+{
+        struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
+
+        if (!policy || IS_ERR(policy->clk)) {
+                pr_err("%s: No %s associated to cpu: %d\n", __func__,
+                                policy ? "clk" : "policy", cpu);
+                return 0;
+        }
+
+        return clk_get_rate(policy->clk) / 1000;
+}
+EXPORT_SYMBOL_GPL(cpufreq_generic_get);
+
 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
 {
         struct cpufreq_policy *policy = NULL;
@@ -320,10 +334,51 @@ void cpufreq_notify_transition(struct cpufreq_policy *policy,
 }
 EXPORT_SYMBOL_GPL(cpufreq_notify_transition);
 
+/* Do post notifications when there are chances that transition has failed */
+void cpufreq_notify_post_transition(struct cpufreq_policy *policy,
+                struct cpufreq_freqs *freqs, int transition_failed)
+{
+        cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
+        if (!transition_failed)
+                return;
+
+        swap(freqs->old, freqs->new);
+        cpufreq_notify_transition(policy, freqs, CPUFREQ_PRECHANGE);
+        cpufreq_notify_transition(policy, freqs, CPUFREQ_POSTCHANGE);
+}
+EXPORT_SYMBOL_GPL(cpufreq_notify_post_transition);
+
 
 /*********************************************************************
  *                          SYSFS INTERFACE                          *
  *********************************************************************/
+ssize_t show_boost(struct kobject *kobj,
+                                 struct attribute *attr, char *buf)
+{
+        return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled);
+}
+
+static ssize_t store_boost(struct kobject *kobj, struct attribute *attr,
+                                  const char *buf, size_t count)
+{
+        int ret, enable;
+
+        ret = sscanf(buf, "%d", &enable);
+        if (ret != 1 || enable < 0 || enable > 1)
+                return -EINVAL;
+
+        if (cpufreq_boost_trigger_state(enable)) {
+                pr_err("%s: Cannot %s BOOST!\n", __func__,
+                       enable ? "enable" : "disable");
+                return -EINVAL;
+        }
+
+        pr_debug("%s: cpufreq BOOST %s\n", __func__,
+                 enable ? "enabled" : "disabled");
+
+        return count;
+}
+define_one_global_rw(boost);
 
 static struct cpufreq_governor *__find_governor(const char *str_governor)
 {
@@ -929,6 +984,9 @@ static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy)
         struct kobject *kobj;
         struct completion *cmp;
 
+        blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+                        CPUFREQ_REMOVE_POLICY, policy);
+
         down_read(&policy->rwsem);
         kobj = &policy->kobj;
         cmp = &policy->kobj_unregister;
@@ -1051,6 +1109,11 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
                 goto err_set_policy_cpu;
         }
 
+        write_lock_irqsave(&cpufreq_driver_lock, flags);
+        for_each_cpu(j, policy->cpus)
+                per_cpu(cpufreq_cpu_data, j) = policy;
+        write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
         if (cpufreq_driver->get) {
                 policy->cur = cpufreq_driver->get(policy->cpu);
                 if (!policy->cur) {
@@ -1059,6 +1122,46 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
                 }
         }
 
+        /*
+         * Sometimes boot loaders set CPU frequency to a value outside of
+         * frequency table present with cpufreq core. In such cases CPU might be
+         * unstable if it has to run on that frequency for long duration of time
+         * and so its better to set it to a frequency which is specified in
+         * freq-table. This also makes cpufreq stats inconsistent as
+         * cpufreq-stats would fail to register because current frequency of CPU
+         * isn't found in freq-table.
+         *
+         * Because we don't want this change to effect boot process badly, we go
+         * for the next freq which is >= policy->cur ('cur' must be set by now,
+         * otherwise we will end up setting freq to lowest of the table as 'cur'
+         * is initialized to zero).
+         *
+         * We are passing target-freq as "policy->cur - 1" otherwise
+         * __cpufreq_driver_target() would simply fail, as policy->cur will be
+         * equal to target-freq.
+         */
+        if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK)
+            && has_target()) {
+                /* Are we running at unknown frequency ? */
+                ret = cpufreq_frequency_table_get_index(policy, policy->cur);
+                if (ret == -EINVAL) {
+                        /* Warn user and fix it */
+                        pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n",
+                                __func__, policy->cpu, policy->cur);
+                        ret = __cpufreq_driver_target(policy, policy->cur - 1,
+                                CPUFREQ_RELATION_L);
+
+                        /*
+                         * Reaching here after boot in a few seconds may not
+                         * mean that system will remain stable at "unknown"
+                         * frequency for longer duration. Hence, a BUG_ON().
+                         */
+                        BUG_ON(ret);
+                        pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n",
+                                __func__, policy->cpu, policy->cur);
+                }
+        }
+
         /* related cpus should atleast have policy->cpus */
         cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus);
 
@@ -1085,15 +1188,12 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
         }
 #endif
 
-        write_lock_irqsave(&cpufreq_driver_lock, flags);
-        for_each_cpu(j, policy->cpus)
-                per_cpu(cpufreq_cpu_data, j) = policy;
-        write_unlock_irqrestore(&cpufreq_driver_lock, flags);
-
         if (!frozen) {
                 ret = cpufreq_add_dev_interface(policy, dev);
                 if (ret)
                         goto err_out_unregister;
+                blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
+                                CPUFREQ_CREATE_POLICY, policy);
         }
 
         write_lock_irqsave(&cpufreq_driver_lock, flags);
@@ -1115,12 +1215,12 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif,
         return 0;
 
 err_out_unregister:
+err_get_freq:
         write_lock_irqsave(&cpufreq_driver_lock, flags);
         for_each_cpu(j, policy->cpus)
                 per_cpu(cpufreq_cpu_data, j) = NULL;
         write_unlock_irqrestore(&cpufreq_driver_lock, flags);
 
-err_get_freq:
         if (cpufreq_driver->exit)
                 cpufreq_driver->exit(policy);
 err_set_policy_cpu:
@@ -1725,17 +1825,8 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
                         pr_err("%s: Failed to change cpu frequency: %d\n",
                                         __func__, retval);
 
-                if (notify) {
-                        /*
-                         * Notify with old freq in case we failed to change
-                         * frequency
-                         */
-                        if (retval)
-                                freqs.new = freqs.old;
-
-                        cpufreq_notify_transition(policy, &freqs,
-                                        CPUFREQ_POSTCHANGE);
-                }
+                if (notify)
+                        cpufreq_notify_post_transition(policy, &freqs, retval);
         }
 
 out:
@@ -2120,6 +2211,73 @@ static struct notifier_block __refdata cpufreq_cpu_notifier = {
 };
 
 /*********************************************************************
+ *               BOOST                                               *
+ *********************************************************************/
+static int cpufreq_boost_set_sw(int state)
+{
+        struct cpufreq_frequency_table *freq_table;
+        struct cpufreq_policy *policy;
+        int ret = -EINVAL;
+
+        list_for_each_entry(policy, &cpufreq_policy_list, policy_list) {
+                freq_table = cpufreq_frequency_get_table(policy->cpu);
+                if (freq_table) {
+                        ret = cpufreq_frequency_table_cpuinfo(policy,
+                                                        freq_table);
+                        if (ret) {
+                                pr_err("%s: Policy frequency update failed\n",
+                                       __func__);
+                                break;
+                        }
+                        policy->user_policy.max = policy->max;
+                        __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
+                }
+        }
+
+        return ret;
+}
+
+int cpufreq_boost_trigger_state(int state)
+{
+        unsigned long flags;
+        int ret = 0;
+
+        if (cpufreq_driver->boost_enabled == state)
+                return 0;
+
+        write_lock_irqsave(&cpufreq_driver_lock, flags);
+        cpufreq_driver->boost_enabled = state;
+        write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+        ret = cpufreq_driver->set_boost(state);
+        if (ret) {
+                write_lock_irqsave(&cpufreq_driver_lock, flags);
+                cpufreq_driver->boost_enabled = !state;
+                write_unlock_irqrestore(&cpufreq_driver_lock, flags);
+
+                pr_err("%s: Cannot %s BOOST\n", __func__,
+                       state ? "enable" : "disable");
+        }
+
+        return ret;
+}
+
+int cpufreq_boost_supported(void)
+{
+        if (likely(cpufreq_driver))
+                return cpufreq_driver->boost_supported;
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(cpufreq_boost_supported);
+
+int cpufreq_boost_enabled(void)
+{
+        return cpufreq_driver->boost_enabled;
+}
+EXPORT_SYMBOL_GPL(cpufreq_boost_enabled);
+
+/*********************************************************************
  *               REGISTER / UNREGISTER CPUFREQ DRIVER                *
  *********************************************************************/
 
@@ -2159,9 +2317,25 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
         cpufreq_driver = driver_data;
         write_unlock_irqrestore(&cpufreq_driver_lock, flags);
 
+        if (cpufreq_boost_supported()) {
+                /*
+                 * Check if driver provides function to enable boost -
+                 * if not, use cpufreq_boost_set_sw as default
+                 */
+                if (!cpufreq_driver->set_boost)
+                        cpufreq_driver->set_boost = cpufreq_boost_set_sw;
+
+                ret = cpufreq_sysfs_create_file(&boost.attr);
+                if (ret) {
+                        pr_err("%s: cannot register global BOOST sysfs file\n",
+                                __func__);
+                        goto err_null_driver;
+                }
+        }
+
         ret = subsys_interface_register(&cpufreq_interface);
         if (ret)
-                goto err_null_driver;
+                goto err_boost_unreg;
 
         if (!(cpufreq_driver->flags & CPUFREQ_STICKY)) {
                 int i;
@@ -2188,6 +2362,9 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
         return 0;
 err_if_unreg:
         subsys_interface_unregister(&cpufreq_interface);
+err_boost_unreg:
+        if (cpufreq_boost_supported())
+                cpufreq_sysfs_remove_file(&boost.attr);
 err_null_driver:
         write_lock_irqsave(&cpufreq_driver_lock, flags);
         cpufreq_driver = NULL;
@@ -2214,6 +2391,9 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
         pr_debug("unregistering driver %s\n", driver->name);
 
         subsys_interface_unregister(&cpufreq_interface);
+        if (cpufreq_boost_supported())
+                cpufreq_sysfs_remove_file(&boost.attr);
+
         unregister_hotcpu_notifier(&cpufreq_cpu_notifier);
 
         down_write(&cpufreq_rwsem);