PM / EM: update callback structure and add device pointer

The Energy Model framework is going to support devices other that CPUs. In
order to make this happen change the callback function and add pointer to
a device as an argument.

Update the related users to use new function and new callback from the
Energy Model.

Acked-by: Quentin Perret <qperret@google.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/scmi-cpufreq.c

@@ -103,17 +103,12 @@ scmi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask)
 }
 
 static int __maybe_unused
-scmi_get_cpu_power(unsigned long *power, unsigned long *KHz, int cpu)
+scmi_get_cpu_power(unsigned long *power, unsigned long *KHz,
+		   struct device *cpu_dev)
 {
-	struct device *cpu_dev = get_cpu_device(cpu);
 	unsigned long Hz;
 	int ret, domain;
 
-	if (!cpu_dev) {
-		pr_err("failed to get cpu%d device\n", cpu);
-		return -ENODEV;
-	}
-
 	domain = handle->perf_ops->device_domain_id(cpu_dev);
 	if (domain < 0)
 		return domain;
@@ -200,7 +195,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy)
 
 	policy->fast_switch_possible = true;
 
-	em_register_perf_domain(policy->cpus, nr_opp, &em_cb);
+	em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, policy->cpus);
 
 	return 0;
 

drivers/opp/of.c

@@ -1216,20 +1216,15 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
  * calculation failed because of missing parameters, 0 otherwise.
  */
 static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz,
-					 int cpu)
+					 struct device *cpu_dev)
 {
-	struct device *cpu_dev;
 	struct dev_pm_opp *opp;
 	struct device_node *np;
 	unsigned long mV, Hz;
 	u32 cap;
 	u64 tmp;
 	int ret;
 
-	cpu_dev = get_cpu_device(cpu);
-	if (!cpu_dev)
-		return -ENODEV;
-
 	np = of_node_get(cpu_dev->of_node);
 	if (!np)
 		return -EINVAL;
@@ -1297,6 +1292,6 @@ void dev_pm_opp_of_register_em(struct cpumask *cpus)
 	if (ret || !cap)
 		return;
 
-	em_register_perf_domain(cpus, nr_opp, &em_cb);
+	em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, cpus);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em);

include/linux/energy_model.h

@@ -48,24 +48,25 @@ struct em_perf_domain {
 struct em_data_callback {
 	/**
 	 * active_power() - Provide power at the next performance state of
-	 *		a CPU
+	 *		a device
 	 * @power	: Active power at the performance state in mW
 	 *		(modified)
 	 * @freq	: Frequency at the performance state in kHz
 	 *		(modified)
-	 * @cpu		: CPU for which we do this operation
+	 * @dev		: Device for which we do this operation (can be a CPU)
 	 *
-	 * active_power() must find the lowest performance state of 'cpu' above
+	 * active_power() must find the lowest performance state of 'dev' above
 	 * 'freq' and update 'power' and 'freq' to the matching active power
 	 * and frequency.
 	 *
-	 * The power is the one of a single CPU in the domain, expressed in
-	 * milli-watts. It is expected to fit in the [0, EM_MAX_POWER]
-	 * range.
+	 * In case of CPUs, the power is the one of a single CPU in the domain,
+	 * expressed in milli-watts. It is expected to fit in the
+	 * [0, EM_MAX_POWER] range.
 	 *
 	 * Return 0 on success.
 	 */
-	int (*active_power)(unsigned long *power, unsigned long *freq, int cpu);
+	int (*active_power)(unsigned long *power, unsigned long *freq,
+			    struct device *dev);
 };
 #define EM_DATA_CB(_active_power_cb) { .active_power = &_active_power_cb }
 

kernel/power/energy_model.c

@@ -78,8 +78,9 @@ core_initcall(em_debug_init);
 #else /* CONFIG_DEBUG_FS */
 static void em_debug_create_pd(struct em_perf_domain *pd, int cpu) {}
 #endif
-static struct em_perf_domain *em_create_pd(cpumask_t *span, int nr_states,
-						struct em_data_callback *cb)
+static struct em_perf_domain *
+em_create_pd(struct device *dev, int nr_states, struct em_data_callback *cb,
+	     cpumask_t *span)
 {
 	unsigned long opp_eff, prev_opp_eff = ULONG_MAX;
 	unsigned long power, freq, prev_freq = 0;
@@ -106,7 +107,7 @@ static struct em_perf_domain *em_create_pd(cpumask_t *span, int nr_states,
 		 * lowest performance state of 'cpu' above 'freq' and updates
 		 * 'power' and 'freq' accordingly.
 		 */
-		ret = cb->active_power(&power, &freq, cpu);
+		ret = cb->active_power(&power, &freq, dev);
 		if (ret) {
 			pr_err("pd%d: invalid perf. state: %d\n", cpu, ret);
 			goto free_ps_table;
@@ -237,7 +238,7 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
 	}
 
 	/* Create the performance domain and add it to the Energy Model. */
-	pd = em_create_pd(span, nr_states, cb);
+	pd = em_create_pd(dev, nr_states, cb, span);
 	if (!pd) {
 		ret = -EINVAL;
 		goto unlock;