@@ -12,6 +12,7 @@
/**
* struct em_perf_state - Performance state of a performance domain
+ * @performance: Non-linear CPU performance at a given frequency
* @frequency: The frequency in KHz, for consistency with CPUFreq
* @power: The power consumed at this level (by 1 CPU or by a registered
* device). It can be a total power: static and dynamic.
@@ -20,6 +21,7 @@
* @flags: see "em_perf_state flags" description below.
*/
struct em_perf_state {
+ unsigned long performance;
unsigned long frequency;
unsigned long power;
unsigned long cost;
@@ -223,14 +225,14 @@ void em_dev_unregister_perf_domain(struct device *dev);
*/
static inline int
em_pd_get_efficient_state(struct em_perf_state *table, int nr_perf_states,
- unsigned long freq, unsigned long pd_flags)
+ unsigned long max_util, unsigned long pd_flags)
{
struct em_perf_state *ps;
int i;
for (i = 0; i < nr_perf_states; i++) {
ps = &table[i];
- if (ps->frequency >= freq) {
+ if (ps->performance >= max_util) {
if (pd_flags & EM_PERF_DOMAIN_SKIP_INEFFICIENCIES &&
ps->flags & EM_PERF_STATE_INEFFICIENT)
continue;
@@ -262,8 +264,8 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd,
unsigned long allowed_cpu_cap)
{
struct em_perf_table *runtime_table;
- unsigned long freq, scale_cpu;
struct em_perf_state *ps;
+ unsigned long scale_cpu;
int cpu, i;
if (!sum_util)
@@ -290,14 +292,13 @@ static inline unsigned long em_cpu_energy(struct em_perf_domain *pd,
max_util = map_util_perf(max_util);
max_util = min(max_util, allowed_cpu_cap);
- freq = map_util_freq(max_util, ps->frequency, scale_cpu);
/*
* Find the lowest performance state of the Energy Model above the
* requested frequency.
*/
i = em_pd_get_efficient_state(runtime_table->state, pd->nr_perf_states,
- freq, pd->flags);
+ max_util, pd->flags);
ps = &runtime_table->state[i];
/*
@@ -46,6 +46,7 @@ static void em_debug_create_ps(struct em_perf_state *ps, struct dentry *pd)
debugfs_create_ulong("frequency", 0444, d, &ps->frequency);
debugfs_create_ulong("power", 0444, d, &ps->power);
debugfs_create_ulong("cost", 0444, d, &ps->cost);
+ debugfs_create_ulong("performance", 0444, d, &ps->performance);
debugfs_create_ulong("inefficient", 0444, d, &ps->flags);
}
@@ -133,6 +134,30 @@ static void em_perf_runtime_table_set(struct device *dev,
call_rcu(&tmp->rcu, em_destroy_rt_table_rcu);
}
+static void em_init_performance(struct device *dev, struct em_perf_domain *pd,
+ struct em_perf_state *table, int nr_states)
+{
+ u64 fmax, max_cap;
+ int i, cpu;
+
+ /* This is needed only for CPUs and EAS skip other devices */
+ if (!_is_cpu_device(dev))
+ return;
+
+ cpu = cpumask_first(em_span_cpus(pd));
+
+ /*
+ * Calculate the performance value for each frequency with
+ * linear relationship. The final CPU capacity might not be ready at
+ * boot time, but the EM will be updated a bit later with correct one.
+ */
+ fmax = (u64) table[nr_states - 1].frequency;
+ max_cap = (u64) arch_scale_cpu_capacity(cpu);
+ for (i = 0; i < nr_states; i++)
+ table[i].performance = div64_u64(max_cap * table[i].frequency,
+ fmax);
+}
+
static int em_compute_costs(struct device *dev, struct em_perf_state *table,
struct em_data_callback *cb, int nr_states,
unsigned long flags)
@@ -317,6 +342,8 @@ static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd,
table[i].frequency = prev_freq = freq;
}
+ em_init_performance(dev, pd, table, nr_states);
+
ret = em_compute_costs(dev, table, cb, nr_states, flags);
if (ret)
goto free_ps_table;