Lines Matching +full:switching +full:- +full:freq
1 // SPDX-License-Identifier: GPL-2.0-only
6 * (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de>
9 * Oct 2005 - Ashok Raj <ashok.raj@intel.com>
11 * Feb 2006 - Jacob Shin <jacob.shin@amd.com>
12 * Fix handling for CPU hotplug -- affected CPUs
54 * The "cpufreq driver" - the arch- or hardware-dependent low
73 return cpufreq_driver->target_index || cpufreq_driver->target; in has_target()
78 return !!cpufreq_driver->target_index; in has_target_index()
114 return !!(cpufreq_driver->flags & CPUFREQ_HAVE_GOVERNOR_PER_POLICY); in have_governor_per_policy()
123 return &policy->kobj; in get_governor_parent_kobj()
147 idle_time = cur_wall_time - busy_time; in get_cpu_idle_time_jiffy()
158 if (idle_time == -1ULL) in get_cpu_idle_time()
170 * - validate & show freq table passed
171 * - set policies transition latency
172 * - policy->cpus with all possible CPUs
178 policy->freq_table = table; in cpufreq_generic_init()
179 policy->cpuinfo.transition_latency = transition_latency; in cpufreq_generic_init()
185 cpumask_setall(policy->cpus); in cpufreq_generic_init()
193 return policy && cpumask_test_cpu(cpu, policy->cpus) ? policy : NULL; in cpufreq_cpu_get_raw()
201 if (!policy || IS_ERR(policy->clk)) { in cpufreq_generic_get()
207 return clk_get_rate(policy->clk) / 1000; in cpufreq_generic_get()
212 * cpufreq_cpu_get - Return policy for a CPU and mark it as busy.
237 kobject_get(&policy->kobj); in cpufreq_cpu_get()
247 * cpufreq_cpu_put - Decrement kobject usage counter for cpufreq policy.
252 kobject_put(&policy->kobj); in cpufreq_cpu_put()
257 * cpufreq_cpu_release - Unlock a policy and decrement its usage counter.
265 lockdep_assert_held(&policy->rwsem); in cpufreq_cpu_release()
267 up_write(&policy->rwsem); in cpufreq_cpu_release()
273 * cpufreq_cpu_acquire - Find policy for a CPU, mark it as busy and lock it.
291 down_write(&policy->rwsem); in cpufreq_cpu_acquire()
306 * adjust_jiffies - Adjust the system "loops_per_jiffy".
313 * per-CPU loops_per_jiffy value wherever possible.
321 if (ci->flags & CPUFREQ_CONST_LOOPS) in adjust_jiffies()
326 l_p_j_ref_freq = ci->old; in adjust_jiffies()
327 pr_debug("saving %lu as reference value for loops_per_jiffy; freq is %u kHz\n", in adjust_jiffies()
330 if (val == CPUFREQ_POSTCHANGE && ci->old != ci->new) { in adjust_jiffies()
332 ci->new); in adjust_jiffies()
334 loops_per_jiffy, ci->new); in adjust_jiffies()
340 * cpufreq_notify_transition - Notify frequency transition and adjust jiffies.
341 * @policy: cpufreq policy to enable fast frequency switching for.
360 freqs->policy = policy; in cpufreq_notify_transition()
361 freqs->flags = cpufreq_driver->flags; in cpufreq_notify_transition()
363 state, freqs->new); in cpufreq_notify_transition()
372 if (policy->cur && policy->cur != freqs->old) { in cpufreq_notify_transition()
374 freqs->old, policy->cur); in cpufreq_notify_transition()
375 freqs->old = policy->cur; in cpufreq_notify_transition()
386 pr_debug("FREQ: %u - CPUs: %*pbl\n", freqs->new, in cpufreq_notify_transition()
387 cpumask_pr_args(policy->cpus)); in cpufreq_notify_transition()
389 for_each_cpu(cpu, policy->cpus) in cpufreq_notify_transition()
390 trace_cpu_frequency(freqs->new, cpu); in cpufreq_notify_transition()
395 cpufreq_stats_record_transition(policy, freqs->new); in cpufreq_notify_transition()
396 policy->cur = freqs->new; in cpufreq_notify_transition()
408 swap(freqs->old, freqs->new); in cpufreq_notify_post_transition()
418 * Catch double invocations of _begin() which lead to self-deadlock. in cpufreq_freq_transition_begin()
422 * where these checks can emit false-positive warnings in these in cpufreq_freq_transition_begin()
425 WARN_ON(!(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION) in cpufreq_freq_transition_begin()
426 && current == policy->transition_task); in cpufreq_freq_transition_begin()
429 wait_event(policy->transition_wait, !policy->transition_ongoing); in cpufreq_freq_transition_begin()
431 spin_lock(&policy->transition_lock); in cpufreq_freq_transition_begin()
433 if (unlikely(policy->transition_ongoing)) { in cpufreq_freq_transition_begin()
434 spin_unlock(&policy->transition_lock); in cpufreq_freq_transition_begin()
438 policy->transition_ongoing = true; in cpufreq_freq_transition_begin()
439 policy->transition_task = current; in cpufreq_freq_transition_begin()
441 spin_unlock(&policy->transition_lock); in cpufreq_freq_transition_begin()
450 if (WARN_ON(!policy->transition_ongoing)) in cpufreq_freq_transition_end()
455 arch_set_freq_scale(policy->related_cpus, in cpufreq_freq_transition_end()
456 policy->cur, in cpufreq_freq_transition_end()
457 policy->cpuinfo.max_freq); in cpufreq_freq_transition_end()
459 spin_lock(&policy->transition_lock); in cpufreq_freq_transition_end()
460 policy->transition_ongoing = false; in cpufreq_freq_transition_end()
461 policy->transition_task = NULL; in cpufreq_freq_transition_end()
462 spin_unlock(&policy->transition_lock); in cpufreq_freq_transition_end()
464 wake_up(&policy->transition_wait); in cpufreq_freq_transition_end()
469 * Fast frequency switching status count. Positive means "enabled", negative
483 for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next) in cpufreq_list_transition_notifiers()
484 pr_info("%pS\n", nb->notifier_call); in cpufreq_list_transition_notifiers()
490 * cpufreq_enable_fast_switch - Enable fast frequency switching for policy.
491 * @policy: cpufreq policy to enable fast frequency switching for.
493 * Try to enable fast frequency switching for @policy.
496 * at this point, as fast frequency switching is quite fundamentally at odds
502 lockdep_assert_held(&policy->rwsem); in cpufreq_enable_fast_switch()
504 if (!policy->fast_switch_possible) in cpufreq_enable_fast_switch()
510 policy->fast_switch_enabled = true; in cpufreq_enable_fast_switch()
512 pr_warn("CPU%u: Fast frequency switching not enabled\n", in cpufreq_enable_fast_switch()
513 policy->cpu); in cpufreq_enable_fast_switch()
521 * cpufreq_disable_fast_switch - Disable fast frequency switching for policy.
522 * @policy: cpufreq policy to disable fast frequency switching for.
527 if (policy->fast_switch_enabled) { in cpufreq_disable_fast_switch()
528 policy->fast_switch_enabled = false; in cpufreq_disable_fast_switch()
530 cpufreq_fast_switch_count--; in cpufreq_disable_fast_switch()
545 if (!policy->freq_table) in __resolve_freq()
549 policy->cached_resolved_idx = idx; in __resolve_freq()
550 policy->cached_target_freq = target_freq; in __resolve_freq()
551 return policy->freq_table[idx].frequency; in __resolve_freq()
555 * cpufreq_driver_resolve_freq - Map a target frequency to a driver-supported
562 * Return: Lowest driver-supported frequency greater than or equal to the
568 unsigned int min = READ_ONCE(policy->min); in cpufreq_driver_resolve_freq()
569 unsigned int max = READ_ONCE(policy->max); in cpufreq_driver_resolve_freq()
573 * read policy->min before the update and policy->max after the update in cpufreq_driver_resolve_freq()
590 if (policy->transition_delay_us) in cpufreq_policy_transition_delay_us()
591 return policy->transition_delay_us; in cpufreq_policy_transition_delay_us()
593 latency = policy->cpuinfo.transition_latency / NSEC_PER_USEC; in cpufreq_policy_transition_delay_us()
618 return sprintf(buf, "%d\n", cpufreq_driver->boost_enabled); in show_boost()
628 return -EINVAL; in store_boost()
633 return -EINVAL; in store_boost()
645 return sysfs_emit(buf, "%d\n", policy->boost_enabled); in show_local_boost()
655 return -EINVAL; in store_local_boost()
657 if (!cpufreq_driver->boost_enabled) in store_local_boost()
658 return -EINVAL; in store_local_boost()
660 if (policy->boost_enabled == enable) in store_local_boost()
663 policy->boost_enabled = enable; in store_local_boost()
666 ret = cpufreq_driver->set_boost(policy, enable); in store_local_boost()
670 policy->boost_enabled = !policy->boost_enabled; in store_local_boost()
684 if (!strncasecmp(str_governor, t->name, CPUFREQ_NAME_LEN)) in find_governor()
699 if (!try_module_get(t->owner)) in get_governor()
720 * cpufreq_parse_governor - parse a governor string only for has_target()
738 * cpufreq_per_cpu_attr_read() / show_##file_name() -
741 * Write out information from cpufreq_driver->policy[cpu]; object must be
749 return sprintf(buf, "%u\n", policy->object); \
766 unsigned int freq; in show_scaling_cur_freq() local
768 freq = arch_freq_get_on_cpu(policy->cpu); in show_scaling_cur_freq()
769 if (freq) in show_scaling_cur_freq()
770 ret = sprintf(buf, "%u\n", freq); in show_scaling_cur_freq()
771 else if (cpufreq_driver->setpolicy && cpufreq_driver->get) in show_scaling_cur_freq()
772 ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu)); in show_scaling_cur_freq()
774 ret = sprintf(buf, "%u\n", policy->cur); in show_scaling_cur_freq()
779 * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
792 ret = freq_qos_update_request(policy->object##_freq_req, val);\
800 * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
814 * show_scaling_governor - show the current policy for the specified CPU
818 if (policy->policy == CPUFREQ_POLICY_POWERSAVE) in show_scaling_governor()
820 else if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) in show_scaling_governor()
822 else if (policy->governor) in show_scaling_governor()
824 policy->governor->name); in show_scaling_governor()
825 return -EINVAL; in show_scaling_governor()
829 * store_scaling_governor - store policy for the specified CPU
839 return -EINVAL; in store_scaling_governor()
841 if (cpufreq_driver->setpolicy) { in store_scaling_governor()
846 return -EINVAL; in store_scaling_governor()
854 return -EINVAL; in store_scaling_governor()
859 module_put(new_gov->owner); in store_scaling_governor()
866 * show_scaling_driver - show the cpufreq driver currently loaded
870 return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name); in show_scaling_driver()
874 * show_scaling_available_governors - show the available CPUfreq governors
890 - (CPUFREQ_NAME_LEN + 2))) in show_scaling_available_governors()
892 i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name); in show_scaling_available_governors()
906 i += scnprintf(&buf[i], (PAGE_SIZE - i - 2), "%u ", cpu); in cpufreq_show_cpus()
907 if (i >= (PAGE_SIZE - 5)) in cpufreq_show_cpus()
912 i--; in cpufreq_show_cpus()
920 * show_related_cpus - show the CPUs affected by each transition even if
925 return cpufreq_show_cpus(policy->related_cpus, buf); in show_related_cpus()
929 * show_affected_cpus - show the CPUs affected by each transition
933 return cpufreq_show_cpus(policy->cpus, buf); in show_affected_cpus()
939 unsigned int freq = 0; in store_scaling_setspeed() local
942 if (!policy->governor || !policy->governor->store_setspeed) in store_scaling_setspeed()
943 return -EINVAL; in store_scaling_setspeed()
945 ret = sscanf(buf, "%u", &freq); in store_scaling_setspeed()
947 return -EINVAL; in store_scaling_setspeed()
949 policy->governor->store_setspeed(policy, freq); in store_scaling_setspeed()
956 if (!policy->governor || !policy->governor->show_setspeed) in show_scaling_setspeed()
959 return policy->governor->show_setspeed(policy, buf); in show_scaling_setspeed()
963 * show_bios_limit - show the current cpufreq HW/BIOS limitation
969 ret = cpufreq_driver->bios_limit(policy->cpu, &limit); in show_bios_limit()
972 return sprintf(buf, "%u\n", policy->cpuinfo.max_freq); in show_bios_limit()
1013 ssize_t ret = -EBUSY; in show()
1015 if (!fattr->show) in show()
1016 return -EIO; in show()
1018 down_read(&policy->rwsem); in show()
1020 ret = fattr->show(policy, buf); in show()
1021 up_read(&policy->rwsem); in show()
1031 ssize_t ret = -EBUSY; in store()
1033 if (!fattr->store) in store()
1034 return -EIO; in store()
1036 down_write(&policy->rwsem); in store()
1038 ret = fattr->store(policy, buf, count); in store()
1039 up_write(&policy->rwsem); in store()
1048 complete(&policy->kobj_unregister); in cpufreq_sysfs_release()
1068 if (cpumask_test_and_set_cpu(cpu, policy->real_cpus)) in add_cpu_dev_symlink()
1072 if (sysfs_create_link(&dev->kobj, &policy->kobj, "cpufreq")) in add_cpu_dev_symlink()
1080 sysfs_remove_link(&dev->kobj, "cpufreq"); in remove_cpu_dev_symlink()
1081 cpumask_clear_cpu(cpu, policy->real_cpus); in remove_cpu_dev_symlink()
1090 drv_attr = cpufreq_driver->attr; in cpufreq_add_dev_interface()
1092 ret = sysfs_create_file(&policy->kobj, &((*drv_attr)->attr)); in cpufreq_add_dev_interface()
1097 if (cpufreq_driver->get) { in cpufreq_add_dev_interface()
1098 ret = sysfs_create_file(&policy->kobj, &cpuinfo_cur_freq.attr); in cpufreq_add_dev_interface()
1103 ret = sysfs_create_file(&policy->kobj, &scaling_cur_freq.attr); in cpufreq_add_dev_interface()
1107 if (cpufreq_driver->bios_limit) { in cpufreq_add_dev_interface()
1108 ret = sysfs_create_file(&policy->kobj, &bios_limit.attr); in cpufreq_add_dev_interface()
1114 ret = sysfs_create_file(&policy->kobj, &local_boost.attr); in cpufreq_add_dev_interface()
1130 gov = get_governor(policy->last_governor); in cpufreq_init_policy()
1133 gov->name, policy->cpu); in cpufreq_init_policy()
1140 __module_get(gov->owner); in cpufreq_init_policy()
1146 if (policy->last_policy) { in cpufreq_init_policy()
1147 pol = policy->last_policy; in cpufreq_init_policy()
1156 pol = policy->policy; in cpufreq_init_policy()
1160 return -ENODATA; in cpufreq_init_policy()
1165 module_put(gov->owner); in cpufreq_init_policy()
1175 if (cpumask_test_cpu(cpu, policy->cpus)) in cpufreq_add_policy_cpu()
1178 down_write(&policy->rwsem); in cpufreq_add_policy_cpu()
1182 cpumask_set_cpu(cpu, policy->cpus); in cpufreq_add_policy_cpu()
1189 up_write(&policy->rwsem); in cpufreq_add_policy_cpu()
1196 pr_debug("updating policy for CPU %u\n", policy->cpu); in refresh_frequency_limits()
1198 cpufreq_set_policy(policy, policy->governor, policy->policy); in refresh_frequency_limits()
1208 pr_debug("handle_update for cpu %u called\n", policy->cpu); in handle_update()
1209 down_write(&policy->rwsem); in handle_update()
1211 up_write(&policy->rwsem); in handle_update()
1214 static int cpufreq_notifier_min(struct notifier_block *nb, unsigned long freq, in cpufreq_notifier_min() argument
1219 schedule_work(&policy->update); in cpufreq_notifier_min()
1223 static int cpufreq_notifier_max(struct notifier_block *nb, unsigned long freq, in cpufreq_notifier_max() argument
1228 schedule_work(&policy->update); in cpufreq_notifier_max()
1237 down_write(&policy->rwsem); in cpufreq_policy_put_kobj()
1239 kobj = &policy->kobj; in cpufreq_policy_put_kobj()
1240 cmp = &policy->kobj_unregister; in cpufreq_policy_put_kobj()
1241 up_write(&policy->rwsem); in cpufreq_policy_put_kobj()
1267 if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL)) in cpufreq_policy_alloc()
1270 if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL)) in cpufreq_policy_alloc()
1273 if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL)) in cpufreq_policy_alloc()
1276 init_completion(&policy->kobj_unregister); in cpufreq_policy_alloc()
1277 ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, in cpufreq_policy_alloc()
1280 dev_err(dev, "%s: failed to init policy->kobj: %d\n", __func__, ret); in cpufreq_policy_alloc()
1286 kobject_put(&policy->kobj); in cpufreq_policy_alloc()
1290 freq_constraints_init(&policy->constraints); in cpufreq_policy_alloc()
1292 policy->nb_min.notifier_call = cpufreq_notifier_min; in cpufreq_policy_alloc()
1293 policy->nb_max.notifier_call = cpufreq_notifier_max; in cpufreq_policy_alloc()
1295 ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MIN, in cpufreq_policy_alloc()
1296 &policy->nb_min); in cpufreq_policy_alloc()
1303 ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MAX, in cpufreq_policy_alloc()
1304 &policy->nb_max); in cpufreq_policy_alloc()
1311 INIT_LIST_HEAD(&policy->policy_list); in cpufreq_policy_alloc()
1312 init_rwsem(&policy->rwsem); in cpufreq_policy_alloc()
1313 spin_lock_init(&policy->transition_lock); in cpufreq_policy_alloc()
1314 init_waitqueue_head(&policy->transition_wait); in cpufreq_policy_alloc()
1315 INIT_WORK(&policy->update, handle_update); in cpufreq_policy_alloc()
1317 policy->cpu = cpu; in cpufreq_policy_alloc()
1321 freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, in cpufreq_policy_alloc()
1322 &policy->nb_min); in cpufreq_policy_alloc()
1326 free_cpumask_var(policy->real_cpus); in cpufreq_policy_alloc()
1328 free_cpumask_var(policy->related_cpus); in cpufreq_policy_alloc()
1330 free_cpumask_var(policy->cpus); in cpufreq_policy_alloc()
1351 list_del(&policy->policy_list); in cpufreq_policy_free()
1353 for_each_cpu(cpu, policy->related_cpus) in cpufreq_policy_free()
1357 freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MAX, in cpufreq_policy_free()
1358 &policy->nb_max); in cpufreq_policy_free()
1359 freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN, in cpufreq_policy_free()
1360 &policy->nb_min); in cpufreq_policy_free()
1362 /* Cancel any pending policy->update work before freeing the policy. */ in cpufreq_policy_free()
1363 cancel_work_sync(&policy->update); in cpufreq_policy_free()
1365 if (policy->max_freq_req) { in cpufreq_policy_free()
1373 freq_qos_remove_request(policy->max_freq_req); in cpufreq_policy_free()
1376 freq_qos_remove_request(policy->min_freq_req); in cpufreq_policy_free()
1377 kfree(policy->min_freq_req); in cpufreq_policy_free()
1380 free_cpumask_var(policy->real_cpus); in cpufreq_policy_free()
1381 free_cpumask_var(policy->related_cpus); in cpufreq_policy_free()
1382 free_cpumask_var(policy->cpus); in cpufreq_policy_free()
1399 WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); in cpufreq_online()
1405 down_write(&policy->rwsem); in cpufreq_online()
1406 policy->cpu = cpu; in cpufreq_online()
1407 policy->governor = NULL; in cpufreq_online()
1412 return -ENOMEM; in cpufreq_online()
1413 down_write(&policy->rwsem); in cpufreq_online()
1416 if (!new_policy && cpufreq_driver->online) { in cpufreq_online()
1417 /* Recover policy->cpus using related_cpus */ in cpufreq_online()
1418 cpumask_copy(policy->cpus, policy->related_cpus); in cpufreq_online()
1420 ret = cpufreq_driver->online(policy); in cpufreq_online()
1427 cpumask_copy(policy->cpus, cpumask_of(cpu)); in cpufreq_online()
1431 * to accept all calls to ->verify and ->setpolicy for this CPU. in cpufreq_online()
1433 ret = cpufreq_driver->init(policy); in cpufreq_online()
1440 /* Let the per-policy boost flag mirror the cpufreq_driver boost during init */ in cpufreq_online()
1442 policy->boost_enabled = true; in cpufreq_online()
1453 /* related_cpus should at least include policy->cpus. */ in cpufreq_online()
1454 cpumask_copy(policy->related_cpus, policy->cpus); in cpufreq_online()
1461 cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); in cpufreq_online()
1464 for_each_cpu(j, policy->related_cpus) { in cpufreq_online()
1469 policy->min_freq_req = kzalloc(2 * sizeof(*policy->min_freq_req), in cpufreq_online()
1471 if (!policy->min_freq_req) { in cpufreq_online()
1472 ret = -ENOMEM; in cpufreq_online()
1476 ret = freq_qos_add_request(&policy->constraints, in cpufreq_online()
1477 policy->min_freq_req, FREQ_QOS_MIN, in cpufreq_online()
1484 kfree(policy->min_freq_req); in cpufreq_online()
1485 policy->min_freq_req = NULL; in cpufreq_online()
1494 policy->max_freq_req = policy->min_freq_req + 1; in cpufreq_online()
1496 ret = freq_qos_add_request(&policy->constraints, in cpufreq_online()
1497 policy->max_freq_req, FREQ_QOS_MAX, in cpufreq_online()
1500 policy->max_freq_req = NULL; in cpufreq_online()
1508 if (cpufreq_driver->get && has_target()) { in cpufreq_online()
1509 policy->cur = cpufreq_driver->get(policy->cpu); in cpufreq_online()
1510 if (!policy->cur) { in cpufreq_online()
1511 ret = -EIO; in cpufreq_online()
1512 pr_err("%s: ->get() failed\n", __func__); in cpufreq_online()
1522 * freq-table. This also makes cpufreq stats inconsistent as in cpufreq_online()
1523 * cpufreq-stats would fail to register because current frequency of CPU in cpufreq_online()
1524 * isn't found in freq-table. in cpufreq_online()
1527 * for the next freq which is >= policy->cur ('cur' must be set by now, in cpufreq_online()
1528 * otherwise we will end up setting freq to lowest of the table as 'cur' in cpufreq_online()
1531 * We are passing target-freq as "policy->cur - 1" otherwise in cpufreq_online()
1532 * __cpufreq_driver_target() would simply fail, as policy->cur will be in cpufreq_online()
1533 * equal to target-freq. in cpufreq_online()
1535 if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK) in cpufreq_online()
1537 unsigned int old_freq = policy->cur; in cpufreq_online()
1541 if (ret == -EINVAL) { in cpufreq_online()
1542 ret = __cpufreq_driver_target(policy, old_freq - 1, in cpufreq_online()
1552 __func__, policy->cpu, old_freq, policy->cur); in cpufreq_online()
1564 list_add(&policy->policy_list, &cpufreq_policy_list); in cpufreq_online()
1577 if (cpufreq_driver->register_em) in cpufreq_online()
1578 cpufreq_driver->register_em(policy); in cpufreq_online()
1588 up_write(&policy->rwsem); in cpufreq_online()
1590 kobject_uevent(&policy->kobj, KOBJ_ADD); in cpufreq_online()
1593 if (cpufreq_driver->ready) in cpufreq_online()
1594 cpufreq_driver->ready(policy); in cpufreq_online()
1598 policy->cdev = of_cpufreq_cooling_register(policy); in cpufreq_online()
1605 for_each_cpu(j, policy->real_cpus) in cpufreq_online()
1609 if (cpufreq_driver->offline) in cpufreq_online()
1610 cpufreq_driver->offline(policy); in cpufreq_online()
1613 if (cpufreq_driver->exit) in cpufreq_online()
1614 cpufreq_driver->exit(policy); in cpufreq_online()
1617 cpumask_clear(policy->cpus); in cpufreq_online()
1618 up_write(&policy->rwsem); in cpufreq_online()
1625 * cpufreq_add_dev - the cpufreq interface for a CPU device.
1632 unsigned cpu = dev->id; in cpufreq_add_dev()
1658 cpumask_clear_cpu(cpu, policy->cpus); in __cpufreq_offline()
1662 if (cpu == policy->cpu) in __cpufreq_offline()
1663 policy->cpu = cpumask_any(policy->cpus); in __cpufreq_offline()
1676 strncpy(policy->last_governor, policy->governor->name, in __cpufreq_offline()
1679 policy->last_policy = policy->policy; in __cpufreq_offline()
1685 * Perform the ->offline() during light-weight tear-down, as in __cpufreq_offline()
1688 if (cpufreq_driver->offline) { in __cpufreq_offline()
1689 cpufreq_driver->offline(policy); in __cpufreq_offline()
1693 if (cpufreq_driver->exit) in __cpufreq_offline()
1694 cpufreq_driver->exit(policy); in __cpufreq_offline()
1696 policy->freq_table = NULL; in __cpufreq_offline()
1711 down_write(&policy->rwsem); in cpufreq_offline()
1715 up_write(&policy->rwsem); in cpufreq_offline()
1720 * cpufreq_remove_dev - remove a CPU device
1726 unsigned int cpu = dev->id; in cpufreq_remove_dev()
1732 down_write(&policy->rwsem); in cpufreq_remove_dev()
1739 if (!cpumask_empty(policy->real_cpus)) { in cpufreq_remove_dev()
1740 up_write(&policy->rwsem); in cpufreq_remove_dev()
1749 cpufreq_cooling_unregister(policy->cdev); in cpufreq_remove_dev()
1750 policy->cdev = NULL; in cpufreq_remove_dev()
1753 /* We did light-weight exit earlier, do full tear down now */ in cpufreq_remove_dev()
1754 if (cpufreq_driver->offline && cpufreq_driver->exit) in cpufreq_remove_dev()
1755 cpufreq_driver->exit(policy); in cpufreq_remove_dev()
1757 up_write(&policy->rwsem); in cpufreq_remove_dev()
1763 * cpufreq_out_of_sync - Fix up actual and saved CPU frequency difference.
1776 policy->cur, new_freq); in cpufreq_out_of_sync()
1778 freqs.old = policy->cur; in cpufreq_out_of_sync()
1789 new_freq = cpufreq_driver->get(policy->cpu); in cpufreq_verify_current_freq()
1794 * If fast frequency switching is used with the given policy, the check in cpufreq_verify_current_freq()
1795 * against policy->cur is pointless, so skip it in that case. in cpufreq_verify_current_freq()
1797 if (policy->fast_switch_enabled || !has_target()) in cpufreq_verify_current_freq()
1800 if (policy->cur != new_freq) { in cpufreq_verify_current_freq()
1808 if (abs(policy->cur - new_freq) < KHZ_PER_MHZ) in cpufreq_verify_current_freq()
1809 return policy->cur; in cpufreq_verify_current_freq()
1813 schedule_work(&policy->update); in cpufreq_verify_current_freq()
1820 * cpufreq_quick_get - get the CPU frequency (in kHz) from policy->cur
1823 * This is the last known freq, without actually getting it from the driver.
1834 if (cpufreq_driver && cpufreq_driver->setpolicy && cpufreq_driver->get) { in cpufreq_quick_get()
1835 ret_freq = cpufreq_driver->get(cpu); in cpufreq_quick_get()
1844 ret_freq = policy->cur; in cpufreq_quick_get()
1853 * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU
1864 ret_freq = policy->max; in cpufreq_quick_get_max()
1873 * cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU
1884 ret_freq = policy->cpuinfo.max_freq; in cpufreq_get_hw_max_freq()
1901 * cpufreq_get - get the current CPU frequency (in kHz)
1912 down_read(&policy->rwsem); in cpufreq_get()
1913 if (cpufreq_driver->get) in cpufreq_get()
1915 up_read(&policy->rwsem); in cpufreq_get()
1939 if (!policy->suspend_freq) { in cpufreq_generic_suspend()
1944 pr_debug("%s: Setting suspend-freq: %u\n", __func__, in cpufreq_generic_suspend()
1945 policy->suspend_freq); in cpufreq_generic_suspend()
1947 ret = __cpufreq_driver_target(policy, policy->suspend_freq, in cpufreq_generic_suspend()
1950 pr_err("%s: unable to set suspend-freq: %u. err: %d\n", in cpufreq_generic_suspend()
1951 __func__, policy->suspend_freq, ret); in cpufreq_generic_suspend()
1958 * cpufreq_suspend() - Suspend CPUFreq governors.
1972 if (!has_target() && !cpufreq_driver->suspend) in cpufreq_suspend()
1979 down_write(&policy->rwsem); in cpufreq_suspend()
1981 up_write(&policy->rwsem); in cpufreq_suspend()
1984 if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy)) in cpufreq_suspend()
1986 cpufreq_driver->name); in cpufreq_suspend()
1994 * cpufreq_resume() - Resume CPUFreq governors.
2012 if (!has_target() && !cpufreq_driver->resume) in cpufreq_resume()
2018 if (cpufreq_driver->resume && cpufreq_driver->resume(policy)) { in cpufreq_resume()
2020 cpufreq_driver->name); in cpufreq_resume()
2022 down_write(&policy->rwsem); in cpufreq_resume()
2024 up_write(&policy->rwsem); in cpufreq_resume()
2028 __func__, policy->cpu); in cpufreq_resume()
2034 * cpufreq_driver_test_flags - Test cpufreq driver's flags against given ones.
2042 return !!(cpufreq_driver->flags & flags); in cpufreq_driver_test_flags()
2046 * cpufreq_get_current_driver - Return the current driver's name.
2054 return cpufreq_driver->name; in cpufreq_get_current_driver()
2061 * cpufreq_get_driver_data - Return current driver data.
2069 return cpufreq_driver->driver_data; in cpufreq_get_driver_data()
2080 * cpufreq_register_notifier - Register a notifier with cpufreq.
2096 return -EINVAL; in cpufreq_register_notifier()
2104 return -EBUSY; in cpufreq_register_notifier()
2109 cpufreq_fast_switch_count--; in cpufreq_register_notifier()
2118 ret = -EINVAL; in cpufreq_register_notifier()
2126 * cpufreq_unregister_notifier - Unregister a notifier from cpufreq.
2140 return -EINVAL; in cpufreq_unregister_notifier()
2158 ret = -EINVAL; in cpufreq_unregister_notifier()
2171 * cpufreq_driver_fast_switch - Carry out a fast CPU frequency switch.
2177 * The driver's ->fast_switch() callback invoked by this function must be
2178 * suitable for being called from within RCU-sched read-side critical sections
2182 * This function must not be called if policy->fast_switch_enabled is unset.
2186 * parallel with either ->target() or ->target_index() for the same policy.
2190 * If 0 is returned by the driver's ->fast_switch() callback to indicate an
2196 unsigned int freq; in cpufreq_driver_fast_switch() local
2199 target_freq = clamp_val(target_freq, policy->min, policy->max); in cpufreq_driver_fast_switch()
2200 freq = cpufreq_driver->fast_switch(policy, target_freq); in cpufreq_driver_fast_switch()
2202 if (!freq) in cpufreq_driver_fast_switch()
2205 policy->cur = freq; in cpufreq_driver_fast_switch()
2206 arch_set_freq_scale(policy->related_cpus, freq, in cpufreq_driver_fast_switch()
2207 policy->cpuinfo.max_freq); in cpufreq_driver_fast_switch()
2208 cpufreq_stats_record_transition(policy, freq); in cpufreq_driver_fast_switch()
2211 for_each_cpu(cpu, policy->cpus) in cpufreq_driver_fast_switch()
2212 trace_cpu_frequency(freq, cpu); in cpufreq_driver_fast_switch()
2215 return freq; in cpufreq_driver_fast_switch()
2220 * cpufreq_driver_adjust_perf - Adjust CPU performance level in one go.
2228 * The driver's ->adjust_perf() callback invoked by this function must be
2229 * suitable for being called from within RCU-sched read-side critical sections
2233 * This function must not be called if policy->fast_switch_enabled is unset.
2237 * parallel with either ->target() or ->target_index() or ->fast_switch() for
2245 cpufreq_driver->adjust_perf(cpu, min_perf, target_perf, capacity); in cpufreq_driver_adjust_perf()
2249 * cpufreq_driver_has_adjust_perf - Check "direct fast switch" callback.
2251 * Return 'true' if the ->adjust_perf callback is present for the
2256 return !!cpufreq_driver->adjust_perf; in cpufreq_driver_has_adjust_perf()
2259 /* Must set freqs->new to intermediate frequency */
2265 freqs->new = cpufreq_driver->get_intermediate(policy, index); in __target_intermediate()
2267 /* We don't need to switch to intermediate freq */ in __target_intermediate()
2268 if (!freqs->new) in __target_intermediate()
2271 pr_debug("%s: cpu: %d, switching to intermediate freq: oldfreq: %u, intermediate freq: %u\n", in __target_intermediate()
2272 __func__, policy->cpu, freqs->old, freqs->new); in __target_intermediate()
2275 ret = cpufreq_driver->target_intermediate(policy, index); in __target_intermediate()
2287 struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0}; in __target_index()
2289 unsigned int newfreq = policy->freq_table[index].frequency; in __target_index()
2290 int retval = -EINVAL; in __target_index()
2293 if (newfreq == policy->cur) in __target_index()
2297 restore_freq = policy->cur; in __target_index()
2299 notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION); in __target_index()
2301 /* Handle switching to intermediate frequency */ in __target_index()
2302 if (cpufreq_driver->get_intermediate) { in __target_index()
2308 /* Set old freq to intermediate */ in __target_index()
2314 pr_debug("%s: cpu: %d, oldfreq: %u, new freq: %u\n", in __target_index()
2315 __func__, policy->cpu, freqs.old, freqs.new); in __target_index()
2320 retval = cpufreq_driver->target_index(policy, index); in __target_index()
2329 * Failed after setting to intermediate freq? Driver should have in __target_index()
2332 * case we haven't switched to intermediate freq at all. in __target_index()
2352 return -ENODEV; in __cpufreq_driver_target()
2354 target_freq = __resolve_freq(policy, target_freq, policy->min, in __cpufreq_driver_target()
2355 policy->max, relation); in __cpufreq_driver_target()
2358 policy->cpu, target_freq, relation, old_target_freq); in __cpufreq_driver_target()
2363 * exactly same freq is called again and so we can save on few function in __cpufreq_driver_target()
2366 if (target_freq == policy->cur && in __cpufreq_driver_target()
2367 !(cpufreq_driver->flags & CPUFREQ_NEED_UPDATE_LIMITS)) in __cpufreq_driver_target()
2370 if (cpufreq_driver->target) { in __cpufreq_driver_target()
2375 if (!policy->efficiencies_available) in __cpufreq_driver_target()
2378 return cpufreq_driver->target(policy, target_freq, relation); in __cpufreq_driver_target()
2381 if (!cpufreq_driver->target_index) in __cpufreq_driver_target()
2382 return -EINVAL; in __cpufreq_driver_target()
2384 return __target_index(policy, policy->cached_resolved_idx); in __cpufreq_driver_target()
2394 down_write(&policy->rwsem); in cpufreq_driver_target()
2398 up_write(&policy->rwsem); in cpufreq_driver_target()
2420 if (!policy->governor) in cpufreq_init_governor()
2421 return -EINVAL; in cpufreq_init_governor()
2423 /* Platform doesn't want dynamic frequency switching ? */ in cpufreq_init_governor()
2424 if (policy->governor->flags & CPUFREQ_GOV_DYNAMIC_SWITCHING && in cpufreq_init_governor()
2425 cpufreq_driver->flags & CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING) { in cpufreq_init_governor()
2429 pr_warn("Can't use %s governor as dynamic switching is disallowed. Fallback to %s governor\n", in cpufreq_init_governor()
2430 policy->governor->name, gov->name); in cpufreq_init_governor()
2431 policy->governor = gov; in cpufreq_init_governor()
2433 return -EINVAL; in cpufreq_init_governor()
2437 if (!try_module_get(policy->governor->owner)) in cpufreq_init_governor()
2438 return -EINVAL; in cpufreq_init_governor()
2440 pr_debug("%s: for CPU %u\n", __func__, policy->cpu); in cpufreq_init_governor()
2442 if (policy->governor->init) { in cpufreq_init_governor()
2443 ret = policy->governor->init(policy); in cpufreq_init_governor()
2445 module_put(policy->governor->owner); in cpufreq_init_governor()
2450 policy->strict_target = !!(policy->governor->flags & CPUFREQ_GOV_STRICT_TARGET); in cpufreq_init_governor()
2457 if (cpufreq_suspended || !policy->governor) in cpufreq_exit_governor()
2460 pr_debug("%s: for CPU %u\n", __func__, policy->cpu); in cpufreq_exit_governor()
2462 if (policy->governor->exit) in cpufreq_exit_governor()
2463 policy->governor->exit(policy); in cpufreq_exit_governor()
2465 module_put(policy->governor->owner); in cpufreq_exit_governor()
2475 if (!policy->governor) in cpufreq_start_governor()
2476 return -EINVAL; in cpufreq_start_governor()
2478 pr_debug("%s: for CPU %u\n", __func__, policy->cpu); in cpufreq_start_governor()
2480 if (cpufreq_driver->get) in cpufreq_start_governor()
2483 if (policy->governor->start) { in cpufreq_start_governor()
2484 ret = policy->governor->start(policy); in cpufreq_start_governor()
2489 if (policy->governor->limits) in cpufreq_start_governor()
2490 policy->governor->limits(policy); in cpufreq_start_governor()
2497 if (cpufreq_suspended || !policy->governor) in cpufreq_stop_governor()
2500 pr_debug("%s: for CPU %u\n", __func__, policy->cpu); in cpufreq_stop_governor()
2502 if (policy->governor->stop) in cpufreq_stop_governor()
2503 policy->governor->stop(policy); in cpufreq_stop_governor()
2508 if (cpufreq_suspended || !policy->governor) in cpufreq_governor_limits()
2511 pr_debug("%s: for CPU %u\n", __func__, policy->cpu); in cpufreq_governor_limits()
2513 if (policy->governor->limits) in cpufreq_governor_limits()
2514 policy->governor->limits(policy); in cpufreq_governor_limits()
2522 return -EINVAL; in cpufreq_register_governor()
2525 return -ENODEV; in cpufreq_register_governor()
2529 err = -EBUSY; in cpufreq_register_governor()
2530 if (!find_governor(governor->name)) { in cpufreq_register_governor()
2532 list_add(&governor->governor_list, &cpufreq_governor_list); in cpufreq_register_governor()
2554 if (!strcmp(policy->last_governor, governor->name)) { in cpufreq_unregister_governor()
2555 policy->governor = NULL; in cpufreq_unregister_governor()
2556 strcpy(policy->last_governor, "\0"); in cpufreq_unregister_governor()
2562 list_del(&governor->governor_list); in cpufreq_unregister_governor()
2573 * cpufreq_get_policy - get the current cpufreq_policy
2584 return -EINVAL; in cpufreq_get_policy()
2588 return -EINVAL; in cpufreq_get_policy()
2598 * cpufreq_set_policy - Modify cpufreq policy parameters.
2601 * @new_pol: Policy value (for drivers with built-in governors).
2603 * Invoke the cpufreq driver's ->verify() callback to sanity-check the frequency
2605 * values and either invoke the driver's ->setpolicy() callback (if present) or
2607 * ->limits() callback (if @new_gov points to the same object as the one in
2620 memcpy(&new_data.cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); in cpufreq_set_policy()
2621 new_data.freq_table = policy->freq_table; in cpufreq_set_policy()
2622 new_data.cpu = policy->cpu; in cpufreq_set_policy()
2627 new_data.min = freq_qos_read_value(&policy->constraints, FREQ_QOS_MIN); in cpufreq_set_policy()
2628 new_data.max = freq_qos_read_value(&policy->constraints, FREQ_QOS_MAX); in cpufreq_set_policy()
2630 pr_debug("setting new policy for CPU %u: %u - %u kHz\n", in cpufreq_set_policy()
2637 ret = cpufreq_driver->verify(&new_data); in cpufreq_set_policy()
2646 * Avoid storing intermediate values in policy->max or policy->min and in cpufreq_set_policy()
2650 WRITE_ONCE(policy->max, __resolve_freq(policy, new_data.max, in cpufreq_set_policy()
2655 WRITE_ONCE(policy->min, new_data.min > policy->max ? policy->max : new_data.min); in cpufreq_set_policy()
2659 policy->cached_target_freq = UINT_MAX; in cpufreq_set_policy()
2661 pr_debug("new min and max freqs are %u - %u kHz\n", in cpufreq_set_policy()
2662 policy->min, policy->max); in cpufreq_set_policy()
2664 if (cpufreq_driver->setpolicy) { in cpufreq_set_policy()
2665 policy->policy = new_pol; in cpufreq_set_policy()
2667 return cpufreq_driver->setpolicy(policy); in cpufreq_set_policy()
2670 if (new_gov == policy->governor) { in cpufreq_set_policy()
2679 old_gov = policy->governor; in cpufreq_set_policy()
2687 policy->governor = new_gov; in cpufreq_set_policy()
2699 /* new governor failed, so re-start old one */ in cpufreq_set_policy()
2700 pr_debug("starting governor %s failed\n", policy->governor->name); in cpufreq_set_policy()
2702 policy->governor = old_gov; in cpufreq_set_policy()
2704 policy->governor = NULL; in cpufreq_set_policy()
2713 * cpufreq_update_policy - Re-evaluate an existing cpufreq policy.
2714 * @cpu: CPU to re-evaluate the policy for.
2717 * cpufreq_set_policy() to re-apply the min and max limits, which triggers the
2718 * evaluation of policy notifiers and the cpufreq driver's ->verify() callback
2729 * BIOS might change freq behind our back in cpufreq_update_policy()
2730 * -> ask driver for current freq and notify governors about a change in cpufreq_update_policy()
2732 if (cpufreq_driver->get && has_target() && in cpufreq_update_policy()
2744 * cpufreq_update_limits - Update policy limits for a given CPU.
2747 * Invoke the driver's ->update_limits callback if present or call
2758 if (cpufreq_driver->update_limits) in cpufreq_update_limits()
2759 cpufreq_driver->update_limits(cpu); in cpufreq_update_limits()
2774 if (!policy->freq_table) in cpufreq_boost_set_sw()
2775 return -ENXIO; in cpufreq_boost_set_sw()
2777 ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table); in cpufreq_boost_set_sw()
2783 ret = freq_qos_update_request(policy->max_freq_req, policy->max); in cpufreq_boost_set_sw()
2796 if (cpufreq_driver->boost_enabled == state) in cpufreq_boost_trigger_state()
2800 cpufreq_driver->boost_enabled = state; in cpufreq_boost_trigger_state()
2805 policy->boost_enabled = state; in cpufreq_boost_trigger_state()
2806 ret = cpufreq_driver->set_boost(policy, state); in cpufreq_boost_trigger_state()
2808 policy->boost_enabled = !policy->boost_enabled; in cpufreq_boost_trigger_state()
2820 cpufreq_driver->boost_enabled = !state; in cpufreq_boost_trigger_state()
2831 return cpufreq_driver->set_boost; in cpufreq_boost_supported()
2855 return -EINVAL; in cpufreq_enable_boost_support()
2860 cpufreq_driver->set_boost = cpufreq_boost_set_sw; in cpufreq_enable_boost_support()
2869 return cpufreq_driver->boost_enabled; in cpufreq_boost_enabled()
2893 * cpufreq_register_driver - register a CPU Frequency driver
2898 * returns zero on success, -EEXIST when another driver got here first
2908 return -ENODEV; in cpufreq_register_driver()
2915 return -EPROBE_DEFER; in cpufreq_register_driver()
2917 if (!driver_data || !driver_data->verify || !driver_data->init || in cpufreq_register_driver()
2918 !(driver_data->setpolicy || driver_data->target_index || in cpufreq_register_driver()
2919 driver_data->target) || in cpufreq_register_driver()
2920 (driver_data->setpolicy && (driver_data->target_index || in cpufreq_register_driver()
2921 driver_data->target)) || in cpufreq_register_driver()
2922 (!driver_data->get_intermediate != !driver_data->target_intermediate) || in cpufreq_register_driver()
2923 (!driver_data->online != !driver_data->offline) || in cpufreq_register_driver()
2924 (driver_data->adjust_perf && !driver_data->fast_switch)) in cpufreq_register_driver()
2925 return -EINVAL; in cpufreq_register_driver()
2927 pr_debug("trying to register driver %s\n", driver_data->name); in cpufreq_register_driver()
2935 ret = -EEXIST; in cpufreq_register_driver()
2945 if (!cpufreq_driver->setpolicy) { in cpufreq_register_driver()
2950 if (driver_data->setpolicy) in cpufreq_register_driver()
2951 driver_data->flags |= CPUFREQ_CONST_LOOPS; in cpufreq_register_driver()
2964 /* if all ->init() calls failed, unregister */ in cpufreq_register_driver()
2965 ret = -ENODEV; in cpufreq_register_driver()
2967 driver_data->name); in cpufreq_register_driver()
2980 pr_debug("driver %s up and running\n", driver_data->name); in cpufreq_register_driver()
2998 * cpufreq_unregister_driver - unregister the current CPUFreq driver
3002 * Returns zero if successful, and -EINVAL if the cpufreq_driver is
3012 pr_debug("unregistering driver %s\n", driver->name); in cpufreq_unregister_driver()
3036 return -ENODEV; in cpufreq_core_init()
3040 cpufreq_global_kobject = kobject_create_and_add("cpufreq", &dev_root->kobj); in cpufreq_core_init()
3046 strncpy(default_governor, gov->name, CPUFREQ_NAME_LEN); in cpufreq_core_init()