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PM: EM: Mark inefficiencies in CPUFreq 

The Energy Model has a 1:1 mapping between OPPs and performance states
(em_perf_state). If a CPUFreq driver registers an Energy Model,
inefficiencies found by the latter can be applied to CPUFreq.

Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Vincent Donnefort 2021-09-08 15:05:30 +01:00 committed by Rafael J. Wysocki
parent b894d20e68
commit e458716a92
1 changed files with 40 additions and 0 deletions
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40
kernel/power/energy_model.c
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@ -10,6 +10,7 @@
#define pr_fmt(fmt) "energy_model: " fmt
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/debugfs.h>
#include <linux/energy_model.h>
@ -231,6 +232,43 @@ static int em_create_pd(struct device *dev, int nr_states,
return 0;
}
static void em_cpufreq_update_efficiencies(struct device *dev)
{
struct em_perf_domain *pd = dev->em_pd;
struct em_perf_state *table;
struct cpufreq_policy *policy;
int found = 0;
int i;
if (!_is_cpu_device(dev) || !pd)
return;
policy = cpufreq_cpu_get(cpumask_first(em_span_cpus(pd)));
if (!policy) {
dev_warn(dev, "EM: Access to CPUFreq policy failed");
return;
}
table = pd->table;
for (i = 0; i < pd->nr_perf_states; i++) {
if (!(table[i].flags & EM_PERF_STATE_INEFFICIENT))
continue;
if (!cpufreq_table_set_inefficient(policy, table[i].frequency))
found++;
}
if (!found)
return;
/*
* Efficiencies have been installed in CPUFreq, inefficient frequencies
* will be skipped. The EM can do the same.
*/
pd->flags |= EM_PERF_DOMAIN_SKIP_INEFFICIENCIES;
}
/**
* em_pd_get() - Return the performance domain for a device
* @dev : Device to find the performance domain for
@ -347,6 +385,8 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
if (milliwatts)
dev->em_pd->flags |= EM_PERF_DOMAIN_MILLIWATTS;
em_cpufreq_update_efficiencies(dev);
em_debug_create_pd(dev);
dev_info(dev, "EM: created perf domain\n");