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| author | Vincent Donnefort <vincent.donnefort@arm.com> | 2021-09-08 16:05:30 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-10-05 16:33:05 +0200 |
| commit | e458716a92b57f854deb89bb40aa3554c2b6205e (patch) | |
| tree | 133af7cb7f26cafc3fd8dfb957e393a28232ab6f /kernel/power | |
| parent | cpufreq: Use CPUFREQ_RELATION_E in DVFS governors (diff) | |
| download | linux-e458716a92b57f854deb89bb40aa3554c2b6205e.tar.xz linux-e458716a92b57f854deb89bb40aa3554c2b6205e.zip | |
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>
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/energy_model.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c index d353ef29e37f..0153b0ca7b23 100644 --- a/kernel/power/energy_model.c +++ b/kernel/power/energy_model.c @@ -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"); |