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cpufreq: Add an interface to mark inefficient frequencies

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Some SoCs such as the sd855 have OPPs within the same policy whose cost is
higher than others with a higher frequency. Those OPPs are inefficients
and it might be interesting for a governor to not use them.

cpufreq_table_set_inefficient() allows the caller to identify a specified
frequency as being inefficient. Inefficient frequencies are only supported
on sorted tables.

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 15:05:27 +01:00 committed by Rafael J. Wysocki
parent 1517176906
commit 442d24a5c4
1 changed files with 41 additions and 3 deletions
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44
include/linux/cpufreq.h
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@ -660,10 +660,11 @@ struct governor_attr {
*********************************************************************/
/* Special Values of .frequency field */
#define CPUFREQ_ENTRY_INVALID ~0u
#define CPUFREQ_TABLE_END ~1u
#define CPUFREQ_ENTRY_INVALID ~0u
#define CPUFREQ_TABLE_END ~1u
/* Special Values of .flags field */
#define CPUFREQ_BOOST_FREQ (1 << 0)
#define CPUFREQ_BOOST_FREQ (1 << 0)
#define CPUFREQ_INEFFICIENT_FREQ (1 << 1)
struct cpufreq_frequency_table {
unsigned int flags;
@ -1003,6 +1004,36 @@ static inline int cpufreq_table_count_valid_entries(const struct cpufreq_policy
return count;
}
/**
* cpufreq_table_set_inefficient() - Mark a frequency as inefficient
* @policy: the &struct cpufreq_policy containing the inefficient frequency
* @frequency: the inefficient frequency
*
* The &struct cpufreq_policy must use a sorted frequency table
*
* Return: %0 on success or a negative errno code
*/
static inline int
cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
unsigned int frequency)
{
struct cpufreq_frequency_table *pos;
/* Not supported */
if (policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED)
return -EINVAL;
cpufreq_for_each_valid_entry(pos, policy->freq_table) {
if (pos->frequency == frequency) {
pos->flags |= CPUFREQ_INEFFICIENT_FREQ;
return 0;
}
}
return -EINVAL;
}
static inline int parse_perf_domain(int cpu, const char *list_name,
const char *cell_name)
{
@ -1071,6 +1102,13 @@ static inline bool policy_has_boost_freq(struct cpufreq_policy *policy)
return false;
}
static inline int
cpufreq_table_set_inefficient(struct cpufreq_policy *policy,
unsigned int frequency)
{
return -EINVAL;
}
static inline int of_perf_domain_get_sharing_cpumask(int pcpu, const char *list_name,
const char *cell_name, struct cpumask *cpumask)
{