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cpufreq: Handle sorted frequency tables more efficiently
cpufreq drivers aren't required to provide a sorted frequency table today, and even the ones which provide a sorted table aren't handled efficiently by cpufreq core. This patch adds infrastructure to verify if the freq-table provided by the drivers is sorted or not, and use efficient helpers if they are sorted. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
Rafael J. Wysocki
parent
8d540ea792
commit
da0c6dc00c
@ -113,9 +113,9 @@ int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy)
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}
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EXPORT_SYMBOL_GPL(cpufreq_generic_frequency_table_verify);
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int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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{
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struct cpufreq_frequency_table optimal = {
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.driver_data = ~0,
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@ -205,7 +205,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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table[index].frequency);
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return index;
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}
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EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);
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EXPORT_SYMBOL_GPL(cpufreq_table_index_unsorted);
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int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
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unsigned int freq)
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@ -297,15 +297,72 @@ struct freq_attr *cpufreq_generic_attr[] = {
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};
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EXPORT_SYMBOL_GPL(cpufreq_generic_attr);
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static int set_freq_table_sorted(struct cpufreq_policy *policy)
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{
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struct cpufreq_frequency_table *pos, *table = policy->freq_table;
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struct cpufreq_frequency_table *prev = NULL;
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int ascending = 0;
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policy->freq_table_sorted = CPUFREQ_TABLE_UNSORTED;
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cpufreq_for_each_valid_entry(pos, table) {
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if (!prev) {
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prev = pos;
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continue;
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}
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if (pos->frequency == prev->frequency) {
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pr_warn("Duplicate freq-table entries: %u\n",
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pos->frequency);
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return -EINVAL;
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}
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/* Frequency increased from prev to pos */
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if (pos->frequency > prev->frequency) {
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/* But frequency was decreasing earlier */
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if (ascending < 0) {
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pr_debug("Freq table is unsorted\n");
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return 0;
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}
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ascending++;
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} else {
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/* Frequency decreased from prev to pos */
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/* But frequency was increasing earlier */
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if (ascending > 0) {
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pr_debug("Freq table is unsorted\n");
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return 0;
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}
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ascending--;
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}
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prev = pos;
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}
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if (ascending > 0)
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policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_ASCENDING;
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else
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policy->freq_table_sorted = CPUFREQ_TABLE_SORTED_DESCENDING;
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pr_debug("Freq table is sorted in %s order\n",
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ascending > 0 ? "ascending" : "descending");
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return 0;
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}
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int cpufreq_table_validate_and_show(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table)
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{
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int ret = cpufreq_frequency_table_cpuinfo(policy, table);
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int ret;
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if (!ret)
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policy->freq_table = table;
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ret = cpufreq_frequency_table_cpuinfo(policy, table);
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if (ret)
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return ret;
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return ret;
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policy->freq_table = table;
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return set_freq_table_sorted(policy);
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}
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EXPORT_SYMBOL_GPL(cpufreq_table_validate_and_show);
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@ -36,6 +36,12 @@
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struct cpufreq_governor;
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enum cpufreq_table_sorting {
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CPUFREQ_TABLE_UNSORTED,
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CPUFREQ_TABLE_SORTED_ASCENDING,
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CPUFREQ_TABLE_SORTED_DESCENDING
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};
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struct cpufreq_freqs {
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unsigned int cpu; /* cpu nr */
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unsigned int old;
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@ -87,6 +93,7 @@ struct cpufreq_policy {
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struct cpufreq_user_policy user_policy;
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struct cpufreq_frequency_table *freq_table;
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enum cpufreq_table_sorting freq_table_sorted;
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struct list_head policy_list;
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struct kobject kobj;
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@ -597,9 +604,9 @@ int cpufreq_frequency_table_verify(struct cpufreq_policy *policy,
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struct cpufreq_frequency_table *table);
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int cpufreq_generic_frequency_table_verify(struct cpufreq_policy *policy);
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int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation);
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int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation);
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int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
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unsigned int freq);
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@ -610,6 +617,227 @@ int cpufreq_boost_trigger_state(int state);
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int cpufreq_boost_enabled(void);
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int cpufreq_enable_boost_support(void);
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bool policy_has_boost_freq(struct cpufreq_policy *policy);
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/* Find lowest freq at or above target in a table in ascending order */
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static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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struct cpufreq_frequency_table *table = policy->freq_table;
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unsigned int freq;
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int i, best = -1;
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for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
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freq = table[i].frequency;
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if (freq >= target_freq)
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return i;
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best = i;
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}
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return best;
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}
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/* Find lowest freq at or above target in a table in descending order */
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static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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struct cpufreq_frequency_table *table = policy->freq_table;
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unsigned int freq;
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int i, best = -1;
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for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
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freq = table[i].frequency;
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if (freq == target_freq)
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return i;
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if (freq > target_freq) {
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best = i;
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continue;
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}
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/* No freq found above target_freq */
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if (best == -1)
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return i;
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return best;
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}
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return best;
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}
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/* Works only on sorted freq-tables */
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static inline int cpufreq_table_find_index_l(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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target_freq = clamp_val(target_freq, policy->min, policy->max);
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if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
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return cpufreq_table_find_index_al(policy, target_freq);
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else
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return cpufreq_table_find_index_dl(policy, target_freq);
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}
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/* Find highest freq at or below target in a table in ascending order */
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static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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struct cpufreq_frequency_table *table = policy->freq_table;
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unsigned int freq;
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int i, best = -1;
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for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
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freq = table[i].frequency;
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if (freq == target_freq)
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return i;
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if (freq < target_freq) {
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best = i;
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continue;
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}
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/* No freq found below target_freq */
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if (best == -1)
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return i;
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return best;
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}
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return best;
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}
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/* Find highest freq at or below target in a table in descending order */
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static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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struct cpufreq_frequency_table *table = policy->freq_table;
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unsigned int freq;
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int i, best = -1;
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for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
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freq = table[i].frequency;
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if (freq <= target_freq)
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return i;
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best = i;
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}
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return best;
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}
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/* Works only on sorted freq-tables */
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static inline int cpufreq_table_find_index_h(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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target_freq = clamp_val(target_freq, policy->min, policy->max);
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if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
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return cpufreq_table_find_index_ah(policy, target_freq);
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else
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return cpufreq_table_find_index_dh(policy, target_freq);
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}
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/* Find closest freq to target in a table in ascending order */
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static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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struct cpufreq_frequency_table *table = policy->freq_table;
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unsigned int freq;
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int i, best = -1;
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for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
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freq = table[i].frequency;
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if (freq == target_freq)
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return i;
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if (freq < target_freq) {
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best = i;
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continue;
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}
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/* No freq found below target_freq */
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if (best == -1)
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return i;
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/* Choose the closest freq */
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if (target_freq - table[best].frequency > freq - target_freq)
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return i;
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return best;
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}
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return best;
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}
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/* Find closest freq to target in a table in descending order */
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static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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struct cpufreq_frequency_table *table = policy->freq_table;
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unsigned int freq;
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int i, best = -1;
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for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) {
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freq = table[i].frequency;
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if (freq == target_freq)
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return i;
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if (freq > target_freq) {
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best = i;
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continue;
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}
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/* No freq found above target_freq */
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if (best == -1)
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return i;
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/* Choose the closest freq */
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if (table[best].frequency - target_freq > target_freq - freq)
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return i;
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return best;
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}
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return best;
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}
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/* Works only on sorted freq-tables */
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static inline int cpufreq_table_find_index_c(struct cpufreq_policy *policy,
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unsigned int target_freq)
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{
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target_freq = clamp_val(target_freq, policy->min, policy->max);
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if (policy->freq_table_sorted == CPUFREQ_TABLE_SORTED_ASCENDING)
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return cpufreq_table_find_index_ac(policy, target_freq);
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else
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return cpufreq_table_find_index_dc(policy, target_freq);
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}
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static inline int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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{
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if (unlikely(policy->freq_table_sorted == CPUFREQ_TABLE_UNSORTED))
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return cpufreq_table_index_unsorted(policy, target_freq,
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relation);
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switch (relation) {
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case CPUFREQ_RELATION_L:
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return cpufreq_table_find_index_l(policy, target_freq);
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case CPUFREQ_RELATION_H:
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return cpufreq_table_find_index_h(policy, target_freq);
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case CPUFREQ_RELATION_C:
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return cpufreq_table_find_index_c(policy, target_freq);
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default:
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pr_err("%s: Invalid relation: %d\n", __func__, relation);
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return -EINVAL;
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}
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}
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#else
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static inline int cpufreq_boost_trigger_state(int state)
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{
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