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PM / EM: update callback structure and add device pointer

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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>
This commit is contained in:
Lukasz Luba 2020-05-27 10:58:49 +01:00 committed by Rafael J. Wysocki
parent 7d9895c7fb
commit d0351cc3b0
4 changed files with 18 additions and 26 deletions
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11
drivers/cpufreq/scmi-cpufreq.c
View File

@ -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;

9
drivers/opp/of.c
View File

@ -1216,9 +1216,8 @@ 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;
@ -1226,10 +1225,6 @@ static int __maybe_unused _get_cpu_power(unsigned long *mW, unsigned long *kHz,
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);

15
include/linux/energy_model.h
View File

@ -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 }

9
kernel/power/energy_model.c
View File

@ -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;