1 files changed, 68 insertions, 15 deletions

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index fcabc42d66ab..dc196bbcf227 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -85,6 +85,20 @@ struct cpufreq_policy {
         struct list_head        policy_list;
         struct kobject          kobj;
         struct completion       kobj_unregister;
+
+        /*
+         * The rules for this semaphore:
+         * - Any routine that wants to read from the policy structure will
+         *   do a down_read on this semaphore.
+         * - Any routine that will write to the policy structure and/or may take away
+         *   the policy altogether (eg. CPU hotplug), will hold this lock in write
+         *   mode before doing so.
+         *
+         * Additional rules:
+         * - Lock should not be held across
+         *     __cpufreq_governor(data, CPUFREQ_GOV_POLICY_EXIT);
+         */
+        struct rw_semaphore     rwsem;
 };
 
 /* Only for ACPI */
@@ -93,8 +107,16 @@ struct cpufreq_policy {
 #define CPUFREQ_SHARED_TYPE_ALL  (2) /* All dependent CPUs should set freq */
 #define CPUFREQ_SHARED_TYPE_ANY  (3) /* Freq can be set from any dependent CPU*/
 
+#ifdef CONFIG_CPU_FREQ
 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 void cpufreq_cpu_put(struct cpufreq_policy *policy);
+#else
+static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
+{
+        return NULL;
+}
+static inline void cpufreq_cpu_put(struct cpufreq_policy *policy) { }
+#endif
 
 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 {
@@ -180,13 +202,6 @@ __ATTR(_name, 0644, show_##_name, store_##_name)
 struct cpufreq_driver {
         char                    name[CPUFREQ_NAME_LEN];
         u8                      flags;
-        /*
-         * This should be set by platforms having multiple clock-domains, i.e.
-         * supporting multiple policies. With this sysfs directories of governor
-         * would be created in cpu/cpu<num>/cpufreq/ directory and so they can
-         * use the same governor with different tunables for different clusters.
-         */
-        bool                    have_governor_per_policy;
 
         /* needed by all drivers */
         int     (*init)         (struct cpufreq_policy *policy);
@@ -194,9 +209,11 @@ struct cpufreq_driver {
 
         /* define one out of two */
         int     (*setpolicy)    (struct cpufreq_policy *policy);
-        int     (*target)       (struct cpufreq_policy *policy,
+        int     (*target)       (struct cpufreq_policy *policy, /* Deprecated */
                                  unsigned int target_freq,
                                  unsigned int relation);
+        int     (*target_index) (struct cpufreq_policy *policy,
+                                 unsigned int index);
 
         /* should be defined, if possible */
         unsigned int    (*get)  (unsigned int cpu);
@@ -211,13 +228,29 @@ struct cpufreq_driver {
 };
 
 /* flags */
-#define CPUFREQ_STICKY          0x01    /* the driver isn't removed even if
-                                         * all ->init() calls failed */
-#define CPUFREQ_CONST_LOOPS     0x02    /* loops_per_jiffy or other kernel
-                                         * "constants" aren't affected by
-                                         * frequency transitions */
-#define CPUFREQ_PM_NO_WARN      0x04    /* don't warn on suspend/resume speed
-                                         * mismatches */
+#define CPUFREQ_STICKY          (1 << 0)        /* driver isn't removed even if
+                                                   all ->init() calls failed */
+#define CPUFREQ_CONST_LOOPS     (1 << 1)        /* loops_per_jiffy or other
+                                                   kernel "constants" aren't
+                                                   affected by frequency
+                                                   transitions */
+#define CPUFREQ_PM_NO_WARN      (1 << 2)        /* don't warn on suspend/resume
+                                                   speed mismatches */
+
+/*
+ * This should be set by platforms having multiple clock-domains, i.e.
+ * supporting multiple policies. With this sysfs directories of governor would
+ * be created in cpu/cpu<num>/cpufreq/ directory and so they can use the same
+ * governor with different tunables for different clusters.
+ */
+#define CPUFREQ_HAVE_GOVERNOR_PER_POLICY (1 << 3)
+
+/*
+ * Driver will do POSTCHANGE notifications from outside of their ->target()
+ * routine and so must set cpufreq_driver->flags with this flag, so that core
+ * can handle them specially.
+ */
+#define CPUFREQ_ASYNC_NOTIFICATION  (1 << 4)
 
 int cpufreq_register_driver(struct cpufreq_driver *driver_data);
 int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
@@ -240,6 +273,13 @@ static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
         return;
 }
 
+static inline void
+cpufreq_verify_within_cpu_limits(struct cpufreq_policy *policy)
+{
+        cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+                        policy->cpuinfo.max_freq);
+}
+
 /*********************************************************************
  *                     CPUFREQ NOTIFIER INTERFACE                    *
  *********************************************************************/
@@ -392,6 +432,7 @@ int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
 
 int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
                                    struct cpufreq_frequency_table *table);
+int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
 
 int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
                                    struct cpufreq_frequency_table *table,
@@ -407,8 +448,20 @@ struct cpufreq_frequency_table *cpufreq_frequency_get_table(unsigned int cpu);
 
 /* the following are really really optional */
 extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
+extern struct freq_attr *cpufreq_generic_attr[];
 void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
                                       unsigned int cpu);
 void cpufreq_frequency_table_put_attr(unsigned int cpu);
+int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
+                                      struct cpufreq_frequency_table *table);
+
+int cpufreq_generic_init(struct cpufreq_policy *policy,
+                struct cpufreq_frequency_table *table,
+                unsigned int transition_latency);
+static inline int cpufreq_generic_exit(struct cpufreq_policy *policy)
+{
+        cpufreq_frequency_table_put_attr(policy->cpu);
+        return 0;
+}
 
 #endif /* _LINUX_CPUFREQ_H */