governors: unify last_state_idx

Since this field is shared by all governors, move it to
cpuidle device structure.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

3 files changed, 18 insertions, 20 deletions

diff --git a/drivers/cpuidle/governors/ladder.c b/drivers/cpuidle/governors/ladder.c
index f0dddc66af26..428eeb832fe7 100644
--- a/drivers/cpuidle/governors/ladder.c
+++ b/drivers/cpuidle/governors/ladder.c
@@ -38,7 +38,6 @@ struct ladder_device_state {
 
 struct ladder_device {
         struct ladder_device_state states[CPUIDLE_STATE_MAX];
-        int last_state_idx;
 };
 
 static DEFINE_PER_CPU(struct ladder_device, ladder_devices);
@@ -49,12 +48,13 @@ static DEFINE_PER_CPU(struct ladder_device, ladder_devices);
  * @old_idx: the current state index
  * @new_idx: the new target state index
  */
-static inline void ladder_do_selection(struct ladder_device *ldev,
+static inline void ladder_do_selection(struct cpuidle_device *dev,
+                                       struct ladder_device *ldev,
                                        int old_idx, int new_idx)
 {
         ldev->states[old_idx].stats.promotion_count = 0;
         ldev->states[old_idx].stats.demotion_count = 0;
-        ldev->last_state_idx = new_idx;
+        dev->last_state_idx = new_idx;
 }
 
 /**
@@ -68,13 +68,13 @@ static int ladder_select_state(struct cpuidle_driver *drv,
 {
         struct ladder_device *ldev = this_cpu_ptr(&ladder_devices);
         struct ladder_device_state *last_state;
-        int last_residency, last_idx = ldev->last_state_idx;
+        int last_residency, last_idx = dev->last_state_idx;
         int first_idx = drv->states[0].flags & CPUIDLE_FLAG_POLLING ? 1 : 0;
         int latency_req = cpuidle_governor_latency_req(dev->cpu);
 
         /* Special case when user has set very strict latency requirement */
         if (unlikely(latency_req == 0)) {
-                ladder_do_selection(ldev, last_idx, 0);
+                ladder_do_selection(dev, ldev, last_idx, 0);
                 return 0;
         }
 
@@ -91,7 +91,7 @@ static int ladder_select_state(struct cpuidle_driver *drv,
                 last_state->stats.promotion_count++;
                 last_state->stats.demotion_count = 0;
                 if (last_state->stats.promotion_count >= last_state->threshold.promotion_count) {
-                        ladder_do_selection(ldev, last_idx, last_idx + 1);
+                        ladder_do_selection(dev, ldev, last_idx, last_idx + 1);
                         return last_idx + 1;
                 }
         }
@@ -107,7 +107,7 @@ static int ladder_select_state(struct cpuidle_driver *drv,
                         if (drv->states[i].exit_latency <= latency_req)
                                 break;
                 }
-                ladder_do_selection(ldev, last_idx, i);
+                ladder_do_selection(dev, ldev, last_idx, i);
                 return i;
         }
 
@@ -116,7 +116,7 @@ static int ladder_select_state(struct cpuidle_driver *drv,
                 last_state->stats.demotion_count++;
                 last_state->stats.promotion_count = 0;
                 if (last_state->stats.demotion_count >= last_state->threshold.demotion_count) {
-                        ladder_do_selection(ldev, last_idx, last_idx - 1);
+                        ladder_do_selection(dev, ldev, last_idx, last_idx - 1);
                         return last_idx - 1;
                 }
         }
@@ -139,7 +139,7 @@ static int ladder_enable_device(struct cpuidle_driver *drv,
         struct ladder_device_state *lstate;
         struct cpuidle_state *state;
 
-        ldev->last_state_idx = first_idx;
+        dev->last_state_idx = first_idx;
 
         for (i = first_idx; i < drv->state_count; i++) {
                 state = &drv->states[i];
@@ -167,9 +167,8 @@ static int ladder_enable_device(struct cpuidle_driver *drv,
  */
 static void ladder_reflect(struct cpuidle_device *dev, int index)
 {
-        struct ladder_device *ldev = this_cpu_ptr(&ladder_devices);
         if (index > 0)
-                ldev->last_state_idx = index;
+                dev->last_state_idx = index;
 }
 
 static struct cpuidle_governor ladder_governor = {
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index e9a28c7846d6..dace4c7f830c 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -117,7 +117,6 @@
  */
 
 struct menu_device {
-        int             last_state_idx;
         int             needs_update;
         int             tick_wakeup;
 
@@ -455,7 +454,7 @@ static void menu_reflect(struct cpuidle_device *dev, int index)
 {
         struct menu_device *data = this_cpu_ptr(&menu_devices);
 
-        data->last_state_idx = index;
+        dev->last_state_idx = index;
         data->needs_update = 1;
         data->tick_wakeup = tick_nohz_idle_got_tick();
 }
@@ -468,7 +467,7 @@ static void menu_reflect(struct cpuidle_device *dev, int index)
 static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
 {
         struct menu_device *data = this_cpu_ptr(&menu_devices);
-        int last_idx = data->last_state_idx;
+        int last_idx = dev->last_state_idx;
         struct cpuidle_state *target = &drv->states[last_idx];
         unsigned int measured_us;
         unsigned int new_factor;
diff --git a/drivers/cpuidle/governors/teo.c b/drivers/cpuidle/governors/teo.c
index 7d05efdbd3c6..a2fd81067a13 100644
--- a/drivers/cpuidle/governors/teo.c
+++ b/drivers/cpuidle/governors/teo.c
@@ -96,7 +96,6 @@ struct teo_idle_state {
  * @time_span_ns: Time between idle state selection and post-wakeup update.
  * @sleep_length_ns: Time till the closest timer event (at the selection time).
  * @states: Idle states data corresponding to this CPU.
- * @last_state: Idle state entered by the CPU last time.
  * @interval_idx: Index of the most recent saved idle interval.
  * @intervals: Saved idle duration values.
  */
@@ -104,7 +103,6 @@ struct teo_cpu {
         u64 time_span_ns;
         u64 sleep_length_ns;
         struct teo_idle_state states[CPUIDLE_STATE_MAX];
-        int last_state;
         int interval_idx;
         unsigned int intervals[INTERVALS];
 };
@@ -130,7 +128,9 @@ static void teo_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
                  */
                 measured_us = sleep_length_us;
         } else {
-                unsigned int lat = drv->states[cpu_data->last_state].exit_latency;
+                unsigned int lat;
+
+                lat = drv->states[dev->last_state_idx].exit_latency;
 
                 measured_us = ktime_to_us(cpu_data->time_span_ns);
                 /*
@@ -245,9 +245,9 @@ static int teo_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
         int max_early_idx, idx, i;
         ktime_t delta_tick;
 
-        if (cpu_data->last_state >= 0) {
+        if (dev->last_state_idx >= 0) {
                 teo_update(drv, dev);
-                cpu_data->last_state = -1;
+                dev->last_state_idx = -1;
         }
 
         cpu_data->time_span_ns = local_clock();
@@ -394,7 +394,7 @@ static void teo_reflect(struct cpuidle_device *dev, int state)
 {
         struct teo_cpu *cpu_data = per_cpu_ptr(&teo_cpus, dev->cpu);
 
-        cpu_data->last_state = state;
+        dev->last_state_idx = state;
         /*
          * If the wakeup was not "natural", but triggered by one of the safety
          * nets, assume that the CPU might have been idle for the entire sleep