From 8101f99703048ceaa31c756abe1098d099249ad9 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 8 Jul 2015 15:12:15 +0530 Subject: cpufreq: cpufreq_add_dev: name goto labels based on what they do These labels are are named in two ways normally: - Based on what caused to jump to such labels - Based on what we do under such labels We follow the first naming convention today and that leads to multiple labels for doing the same work. Fix it by switching to the second way of naming them. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 26063afb3eba..702777b1d645 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1288,7 +1288,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) recover_policy = false; policy = cpufreq_policy_alloc(dev); if (!policy) - goto nomem_out; + goto out_release_rwsem; } cpumask_copy(policy->cpus, cpumask_of(cpu)); @@ -1299,7 +1299,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) ret = cpufreq_driver->init(policy); if (ret) { pr_debug("initialization failed\n"); - goto err_set_policy_cpu; + goto out_free_policy; } down_write(&policy->rwsem); @@ -1327,7 +1327,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) policy->cur = cpufreq_driver->get(policy->cpu); if (!policy->cur) { pr_err("%s: ->get() failed\n", __func__); - goto err_get_freq; + goto out_exit_policy; } } @@ -1377,7 +1377,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) if (!recover_policy) { ret = cpufreq_add_dev_interface(policy, dev); if (ret) - goto err_out_unregister; + goto out_exit_policy; blocking_notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_CREATE_POLICY, policy); @@ -1406,15 +1406,14 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) return 0; -err_out_unregister: -err_get_freq: +out_exit_policy: up_write(&policy->rwsem); if (cpufreq_driver->exit) cpufreq_driver->exit(policy); -err_set_policy_cpu: +out_free_policy: cpufreq_policy_free(policy, recover_policy); -nomem_out: +out_release_rwsem: up_read(&cpufreq_rwsem); return ret; -- cgit v1.2.1 From 7f0fa40f5a587c2a026de776cc6a26373ac0f244 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 8 Jul 2015 15:12:16 +0530 Subject: cpufreq: Properly handle errors from cpufreq_init_policy() cpufreq_init_policy() can fail, and we don't do anything except a call to ->exit() on that. The policy should be freed if this happens. Do it properly. Reported-and-tested-by: "Jon Medhurst (Tixy)" Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 702777b1d645..a7b6ac6e048e 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1060,11 +1060,10 @@ static int cpufreq_add_dev_interface(struct cpufreq_policy *policy, return cpufreq_add_dev_symlink(policy); } -static void cpufreq_init_policy(struct cpufreq_policy *policy) +static int cpufreq_init_policy(struct cpufreq_policy *policy) { struct cpufreq_governor *gov = NULL; struct cpufreq_policy new_policy; - int ret = 0; memcpy(&new_policy, policy, sizeof(*policy)); @@ -1083,12 +1082,7 @@ static void cpufreq_init_policy(struct cpufreq_policy *policy) cpufreq_parse_governor(gov->name, &new_policy.policy, NULL); /* set default policy */ - ret = cpufreq_set_policy(policy, &new_policy); - if (ret) { - pr_debug("setting policy failed\n"); - if (cpufreq_driver->exit) - cpufreq_driver->exit(policy); - } + return cpufreq_set_policy(policy, &new_policy); } static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, @@ -1386,7 +1380,12 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) write_unlock_irqrestore(&cpufreq_driver_lock, flags); } - cpufreq_init_policy(policy); + ret = cpufreq_init_policy(policy); + if (ret) { + pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n", + __func__, cpu, ret); + goto out_remove_policy_notify; + } if (!recover_policy) { policy->user_policy.policy = policy->policy; @@ -1406,6 +1405,9 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) return 0; +out_remove_policy_notify: + /* cpufreq_policy_free() will notify based on this */ + recover_policy = true; out_exit_policy: up_write(&policy->rwsem); -- cgit v1.2.1 From 4bc384ae6299d3f3a948efabda2a423e2a293ee0 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Sat, 18 Jul 2015 11:31:03 +0530 Subject: cpufreq: propagate errors returned from __cpufreq_governor() Return codes aren't honored properly in cpufreq_set_policy(). This can lead to two problems: - wrong errors propagated to sysfs - we try to do next state-change even if the previous one failed cpufreq_governor_dbs() now returns proper errors on all invalid state-transition requests and this code should honor that. Reviewed-and-tested-by: Preeti U Murthy Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index a7b6ac6e048e..a3e8fb61cbcc 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2295,16 +2295,31 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, old_gov = policy->governor; /* end old governor */ if (old_gov) { - __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + if (ret) { + /* This can happen due to race with other operations */ + pr_debug("%s: Failed to Stop Governor: %s (%d)\n", + __func__, old_gov->name, ret); + return ret; + } + up_write(&policy->rwsem); - __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); + ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); down_write(&policy->rwsem); + + if (ret) { + pr_err("%s: Failed to Exit Governor: %s (%d)\n", + __func__, old_gov->name, ret); + return ret; + } } /* start new governor */ policy->governor = new_policy->governor; - if (!__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) { - if (!__cpufreq_governor(policy, CPUFREQ_GOV_START)) + ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); + if (!ret) { + ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); + if (!ret) goto out; up_write(&policy->rwsem); @@ -2316,11 +2331,13 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, pr_debug("starting governor %s failed\n", policy->governor->name); if (old_gov) { policy->governor = old_gov; - __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT); - __cpufreq_governor(policy, CPUFREQ_GOV_START); + if (__cpufreq_governor(policy, CPUFREQ_GOV_POLICY_INIT)) + policy->governor = NULL; + else + __cpufreq_governor(policy, CPUFREQ_GOV_START); } - return -EINVAL; + return ret; out: pr_debug("governor: change or update limits\n"); -- cgit v1.2.1 From 454d3a2500a4eb33be85dde3bfba9e5f6b5efadc Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Wed, 22 Jul 2015 17:59:11 +0200 Subject: cpufreq: Remove cpufreq_rwsem cpufreq_rwsem was introduced in commit 6eed9404ab3c4 ("cpufreq: Use rwsem for protecting critical sections) in order to replace try_module_get() on the cpu-freq driver. That try_module_get() worked well until the refcount was so heavily used that module removal became more or less impossible. Though when looking at the various (undocumented) protection mechanisms in that code, the randomly sprinkeled around cpufreq_rwsem locking sites are superfluous. The policy, which is acquired in cpufreq_cpu_get() and released in cpufreq_cpu_put() is sufficiently protected already. cpufreq_cpu_get(cpu) /* Protects against concurrent driver removal */ read_lock_irqsave(&cpufreq_driver_lock, flags); policy = per_cpu(cpufreq_cpu_data, cpu); kobject_get(&policy->kobj); read_unlock_irqrestore(&cpufreq_driver_lock, flags); The reference on the policy serializes versus module unload already: cpufreq_unregister_driver() subsys_interface_unregister() __cpufreq_remove_dev_finish() per_cpu(cpufreq_cpu_data) = NULL; cpufreq_policy_put_kobj() If there is a reference held on the policy, i.e. obtained prior to the unregister call, then cpufreq_policy_put_kobj() will wait until that reference is dropped. So once subsys_interface_unregister() returns there is no policy pointer in flight and no new reference can be obtained. So that rwsem protection is useless. The other usage of cpufreq_rwsem in show()/store() of the sysfs interface is redundant as well because sysfs already does the proper kobject_get()/put() pairs. That leaves CPU hotplug versus module removal. The current down_write() around the write_lock() in cpufreq_unregister_driver() is silly at best as it protects actually nothing. The trivial solution to this is to prevent hotplug across cpufreq_unregister_driver completely. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 41 +++-------------------------------------- 1 file changed, 3 insertions(+), 38 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index a3e8fb61cbcc..febda462681c 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -112,12 +112,6 @@ static inline bool has_target(void) return cpufreq_driver->target_index || cpufreq_driver->target; } -/* - * rwsem to guarantee that cpufreq driver module doesn't unload during critical - * sections - */ -static DECLARE_RWSEM(cpufreq_rwsem); - /* internal prototypes */ static int __cpufreq_governor(struct cpufreq_policy *policy, unsigned int event); @@ -277,10 +271,6 @@ EXPORT_SYMBOL_GPL(cpufreq_generic_get); * If corresponding call cpufreq_cpu_put() isn't made, the policy wouldn't be * freed as that depends on the kobj count. * - * It also takes a read-lock of 'cpufreq_rwsem' and doesn't put it back if a - * valid policy is found. This is done to make sure the driver doesn't get - * unregistered while the policy is being used. - * * Return: A valid policy on success, otherwise NULL on failure. */ struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) @@ -291,9 +281,6 @@ struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) if (WARN_ON(cpu >= nr_cpu_ids)) return NULL; - if (!down_read_trylock(&cpufreq_rwsem)) - return NULL; - /* get the cpufreq driver */ read_lock_irqsave(&cpufreq_driver_lock, flags); @@ -306,9 +293,6 @@ struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu) read_unlock_irqrestore(&cpufreq_driver_lock, flags); - if (!policy) - up_read(&cpufreq_rwsem); - return policy; } EXPORT_SYMBOL_GPL(cpufreq_cpu_get); @@ -320,13 +304,10 @@ EXPORT_SYMBOL_GPL(cpufreq_cpu_get); * * This decrements the kobject reference count incremented earlier by calling * cpufreq_cpu_get(). - * - * It also drops the read-lock of 'cpufreq_rwsem' taken at cpufreq_cpu_get(). */ void cpufreq_cpu_put(struct cpufreq_policy *policy) { kobject_put(&policy->kobj); - up_read(&cpufreq_rwsem); } EXPORT_SYMBOL_GPL(cpufreq_cpu_put); @@ -851,9 +832,6 @@ static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) struct freq_attr *fattr = to_attr(attr); ssize_t ret; - if (!down_read_trylock(&cpufreq_rwsem)) - return -EINVAL; - down_read(&policy->rwsem); if (fattr->show) @@ -862,7 +840,6 @@ static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf) ret = -EIO; up_read(&policy->rwsem); - up_read(&cpufreq_rwsem); return ret; } @@ -879,9 +856,6 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr, if (!cpu_online(policy->cpu)) goto unlock; - if (!down_read_trylock(&cpufreq_rwsem)) - goto unlock; - down_write(&policy->rwsem); /* Updating inactive policies is invalid, so avoid doing that. */ @@ -897,8 +871,6 @@ static ssize_t store(struct kobject *kobj, struct attribute *attr, unlock_policy_rwsem: up_write(&policy->rwsem); - - up_read(&cpufreq_rwsem); unlock: put_online_cpus(); @@ -1261,15 +1233,11 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) if (cpu_is_offline(cpu)) return add_cpu_dev_symlink(per_cpu(cpufreq_cpu_data, cpu), cpu); - if (!down_read_trylock(&cpufreq_rwsem)) - return 0; - /* Check if this CPU already has a policy to manage it */ policy = per_cpu(cpufreq_cpu_data, cpu); if (policy && !policy_is_inactive(policy)) { WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); ret = cpufreq_add_policy_cpu(policy, cpu, dev); - up_read(&cpufreq_rwsem); return ret; } @@ -1395,8 +1363,6 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) kobject_uevent(&policy->kobj, KOBJ_ADD); - up_read(&cpufreq_rwsem); - /* Callback for handling stuff after policy is ready */ if (cpufreq_driver->ready) cpufreq_driver->ready(policy); @@ -1416,8 +1382,6 @@ out_exit_policy: out_free_policy: cpufreq_policy_free(policy, recover_policy); out_release_rwsem: - up_read(&cpufreq_rwsem); - return ret; } @@ -2604,19 +2568,20 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver) pr_debug("unregistering driver %s\n", driver->name); + /* Protect against concurrent cpu hotplug */ + get_online_cpus(); subsys_interface_unregister(&cpufreq_interface); if (cpufreq_boost_supported()) cpufreq_sysfs_remove_file(&boost.attr); unregister_hotcpu_notifier(&cpufreq_cpu_notifier); - down_write(&cpufreq_rwsem); write_lock_irqsave(&cpufreq_driver_lock, flags); cpufreq_driver = NULL; write_unlock_irqrestore(&cpufreq_driver_lock, flags); - up_write(&cpufreq_rwsem); + put_online_cpus(); return 0; } -- cgit v1.2.1 From 15c0b4d222f83672407419f9c9e167e996d8ad2b Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 27 Jul 2015 23:11:09 +0200 Subject: cpufreq: Rework two functions related to CPU offline Since __cpufreq_remove_dev_prepare() and __cpufreq_remove_dev_finish() are about CPU offline rather than about CPU removal, rename them to cpufreq_offline_prepare() and cpufreq_offline_finish(), respectively. Also change their argument from a struct device pointer to a CPU number, because they use the CPU number only internally anyway and make them void as their return values are ignored. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 32 ++++++++++++-------------------- 1 file changed, 12 insertions(+), 20 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 46251e8d30f2..29e3ec979266 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1398,10 +1398,8 @@ out_release_rwsem: return ret; } -static int __cpufreq_remove_dev_prepare(struct device *dev) +static void cpufreq_offline_prepare(unsigned int cpu) { - unsigned int cpu = dev->id; - int ret = 0; struct cpufreq_policy *policy; pr_debug("%s: unregistering CPU %u\n", __func__, cpu); @@ -1409,11 +1407,11 @@ static int __cpufreq_remove_dev_prepare(struct device *dev) policy = cpufreq_cpu_get_raw(cpu); if (!policy) { pr_debug("%s: No cpu_data found\n", __func__); - return -EINVAL; + return; } if (has_target()) { - ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); + int ret = __cpufreq_governor(policy, CPUFREQ_GOV_STOP); if (ret) pr_err("%s: Failed to stop governor\n", __func__); } @@ -1434,7 +1432,7 @@ static int __cpufreq_remove_dev_prepare(struct device *dev) /* Start governor again for active policy */ if (!policy_is_inactive(policy)) { if (has_target()) { - ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); + int ret = __cpufreq_governor(policy, CPUFREQ_GOV_START); if (!ret) ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS); @@ -1444,28 +1442,24 @@ static int __cpufreq_remove_dev_prepare(struct device *dev) } else if (cpufreq_driver->stop_cpu) { cpufreq_driver->stop_cpu(policy); } - - return ret; } -static int __cpufreq_remove_dev_finish(struct device *dev) +static void cpufreq_offline_finish(unsigned int cpu) { - unsigned int cpu = dev->id; - int ret; struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); if (!policy) { pr_debug("%s: No cpu_data found\n", __func__); - return -EINVAL; + return; } /* Only proceed for inactive policies */ if (!policy_is_inactive(policy)) - return 0; + return; /* If cpu is last user of policy, free policy */ if (has_target()) { - ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); + int ret = __cpufreq_governor(policy, CPUFREQ_GOV_POLICY_EXIT); if (ret) pr_err("%s: Failed to exit governor\n", __func__); } @@ -1477,8 +1471,6 @@ static int __cpufreq_remove_dev_finish(struct device *dev) */ if (cpufreq_driver->exit) cpufreq_driver->exit(policy); - - return 0; } /** @@ -1495,8 +1487,8 @@ static int cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif) return 0; if (cpu_online(cpu)) { - __cpufreq_remove_dev_prepare(dev); - __cpufreq_remove_dev_finish(dev); + cpufreq_offline_prepare(cpu); + cpufreq_offline_finish(cpu); } cpumask_clear_cpu(cpu, policy->real_cpus); @@ -2379,11 +2371,11 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb, break; case CPU_DOWN_PREPARE: - __cpufreq_remove_dev_prepare(dev); + cpufreq_offline_prepare(cpu); break; case CPU_POST_DEAD: - __cpufreq_remove_dev_finish(dev); + cpufreq_offline_finish(cpu); break; case CPU_DOWN_FAILED: -- cgit v1.2.1 From 11ce707e6c2aea05e1f54680fb89a8a44ded5db4 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 27 Jul 2015 23:11:21 +0200 Subject: cpufreq: Drop cpufreq_policy_restore() Notice that when cpufreq_policy_restore() is called, its per-CPU cpufreq_cpu_data variable has been already dereferenced and if that variable is not NULL, the policy local pointer in cpufreq_add_dev() contains its value. Therefore it is not necessary to dereference it again and the policy pointer can be used directly. Moreover, if that pointer is not NULL, the policy is inactive (or the previous check would have made us return from cpufreq_add_dev()) so the restoration code from cpufreq_policy_restore() can be moved to that point in cpufreq_add_dev(). Do that and drop cpufreq_policy_restore(). Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 44 +++++++++++--------------------------------- 1 file changed, 11 insertions(+), 33 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 29e3ec979266..3199b8dafd60 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1092,28 +1092,6 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, return 0; } -static struct cpufreq_policy *cpufreq_policy_restore(unsigned int cpu) -{ - struct cpufreq_policy *policy; - unsigned long flags; - - read_lock_irqsave(&cpufreq_driver_lock, flags); - policy = per_cpu(cpufreq_cpu_data, cpu); - read_unlock_irqrestore(&cpufreq_driver_lock, flags); - - if (likely(policy)) { - /* Policy should be inactive here */ - WARN_ON(!policy_is_inactive(policy)); - - down_write(&policy->rwsem); - policy->cpu = cpu; - policy->governor = NULL; - up_write(&policy->rwsem); - } - - return policy; -} - static struct cpufreq_policy *cpufreq_policy_alloc(struct device *dev) { struct cpufreq_policy *policy; @@ -1226,7 +1204,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) int ret = -ENOMEM; struct cpufreq_policy *policy; unsigned long flags; - bool recover_policy = !sif; + bool recover_policy; pr_debug("adding CPU %u\n", cpu); @@ -1244,18 +1222,18 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) /* Check if this CPU already has a policy to manage it */ policy = per_cpu(cpufreq_cpu_data, cpu); - if (policy && !policy_is_inactive(policy)) { + if (policy) { WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); - ret = cpufreq_add_policy_cpu(policy, cpu, dev); - return ret; - } + if (!policy_is_inactive(policy)) + return cpufreq_add_policy_cpu(policy, cpu, dev); - /* - * Restore the saved policy when doing light-weight init and fall back - * to the full init if that fails. - */ - policy = recover_policy ? cpufreq_policy_restore(cpu) : NULL; - if (!policy) { + /* This is the only online CPU for the policy. Start over. */ + recover_policy = true; + down_write(&policy->rwsem); + policy->cpu = cpu; + policy->governor = NULL; + up_write(&policy->rwsem); + } else { recover_policy = false; policy = cpufreq_policy_alloc(dev); if (!policy) -- cgit v1.2.1 From d4d854d6c7706e6a5cda297e350e3626d55e9bc9 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 27 Jul 2015 23:11:30 +0200 Subject: cpufreq: Drop unnecessary label from cpufreq_add_dev() The leftover out_release_rwsem label in cpufreq_add_dev() is not necessary any more and confusing, so drop it. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 3199b8dafd60..5c80502339a1 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1201,7 +1201,7 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify) static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) { unsigned int j, cpu = dev->id; - int ret = -ENOMEM; + int ret; struct cpufreq_policy *policy; unsigned long flags; bool recover_policy; @@ -1237,7 +1237,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) recover_policy = false; policy = cpufreq_policy_alloc(dev); if (!policy) - goto out_release_rwsem; + return -ENOMEM; } cpumask_copy(policy->cpus, cpumask_of(cpu)); @@ -1372,7 +1372,6 @@ out_exit_policy: cpufreq_driver->exit(policy); out_free_policy: cpufreq_policy_free(policy, recover_policy); -out_release_rwsem: return ret; } -- cgit v1.2.1 From d9612a495b0bc93f5db0e0033fe4ee7abb7167c7 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 27 Jul 2015 23:11:37 +0200 Subject: cpufreq: Drop unused dev argument from two functions The dev argument of cpufreq_add_policy_cpu() and cpufreq_add_dev_interface() is not used by any of them, so drop it. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 5c80502339a1..9d8f8cd64e58 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -999,8 +999,7 @@ static void cpufreq_remove_dev_symlink(struct cpufreq_policy *policy) } } -static int cpufreq_add_dev_interface(struct cpufreq_policy *policy, - struct device *dev) +static int cpufreq_add_dev_interface(struct cpufreq_policy *policy) { struct freq_attr **drv_attr; int ret = 0; @@ -1057,8 +1056,7 @@ static int cpufreq_init_policy(struct cpufreq_policy *policy) return cpufreq_set_policy(policy, &new_policy); } -static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, - unsigned int cpu, struct device *dev) +static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu) { int ret = 0; @@ -1225,7 +1223,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) if (policy) { WARN_ON(!cpumask_test_cpu(cpu, policy->related_cpus)); if (!policy_is_inactive(policy)) - return cpufreq_add_policy_cpu(policy, cpu, dev); + return cpufreq_add_policy_cpu(policy, cpu); /* This is the only online CPU for the policy. Start over. */ recover_policy = true; @@ -1328,7 +1326,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) CPUFREQ_START, policy); if (!recover_policy) { - ret = cpufreq_add_dev_interface(policy, dev); + ret = cpufreq_add_dev_interface(policy); if (ret) goto out_exit_policy; blocking_notifier_call_chain(&cpufreq_policy_notifier_list, -- cgit v1.2.1 From 4d1f3a5bcb489cc6f7cbc128e0c292fed7868d32 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 27 Jul 2015 23:11:44 +0200 Subject: cpufreq: Do not update related_cpus on every policy activation The related_cpus mask includes CPUs whose cpufreq_cpu_data per-CPU pointers have been set the the given policy. Since those pointers are only set at the policy creation time and unset when the policy is deleted, the related_cpus should not be updated between those two operations. For this reason, avoid updating it whenever the first of the "related" CPUs goes online. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 9d8f8cd64e58..0ea4bb723760 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1251,12 +1251,12 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) down_write(&policy->rwsem); - /* related cpus should atleast have policy->cpus */ - cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); - - /* Remember which CPUs have been present at the policy creation time. */ - if (!recover_policy) + if (!recover_policy) { + /* related_cpus should at least include policy->cpus. */ + cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); + /* Remember CPUs present at the policy creation time. */ cpumask_and(policy->real_cpus, policy->cpus, cpu_present_mask); + } /* * affected cpus must always be the one, which are online. We aren't -- cgit v1.2.1 From a34e63b14486e98cf78c99bf8ef141de7508dbc2 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 27 Jul 2015 23:11:50 +0200 Subject: cpufreq: Pass CPU number to cpufreq_policy_alloc() Change cpufreq_policy_alloc() to take a CPU number instead of a CPU device pointer as its argument, as it is the only function called by cpufreq_add_dev() taking a device pointer argument at this point. That will allow us to split the CPU online part from cpufreq_add_dev() more cleanly going forward. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 0ea4bb723760..0618522d4863 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1090,11 +1090,15 @@ static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cp return 0; } -static struct cpufreq_policy *cpufreq_policy_alloc(struct device *dev) +static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu) { + struct device *dev = get_cpu_device(cpu); struct cpufreq_policy *policy; int ret; + if (WARN_ON(!dev)) + return NULL; + policy = kzalloc(sizeof(*policy), GFP_KERNEL); if (!policy) return NULL; @@ -1122,10 +1126,10 @@ static struct cpufreq_policy *cpufreq_policy_alloc(struct device *dev) init_completion(&policy->kobj_unregister); INIT_WORK(&policy->update, handle_update); - policy->cpu = dev->id; + policy->cpu = cpu; /* Set this once on allocation */ - policy->kobj_cpu = dev->id; + policy->kobj_cpu = cpu; return policy; @@ -1233,7 +1237,7 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) up_write(&policy->rwsem); } else { recover_policy = false; - policy = cpufreq_policy_alloc(dev); + policy = cpufreq_policy_alloc(cpu); if (!policy) return -ENOMEM; } -- cgit v1.2.1 From 0b275352872b2641ed5c94d0f0f8c7e907bf3e3f Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 29 Jul 2015 03:03:44 +0200 Subject: cpufreq: Separate CPU device registration from CPU online To separate the CPU online interface from the CPU device registration, split cpufreq_online() out of cpufreq_add_dev() and make cpufreq_cpu_callback() call the former, while cpufreq_add_dev() itself will only be used as the CPU device addition subsystem interface callback. Signed-off-by: Rafael J. Wysocki Suggested-by: Russell King Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 90 +++++++++++++++++++++++++---------------------- 1 file changed, 47 insertions(+), 43 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 0618522d4863..0d46b557c016 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1191,36 +1191,15 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify) kfree(policy); } -/** - * cpufreq_add_dev - add a CPU device - * - * Adds the cpufreq interface for a CPU device. - * - * The Oracle says: try running cpufreq registration/unregistration concurrently - * with with cpu hotplugging and all hell will break loose. Tried to clean this - * mess up, but more thorough testing is needed. - Mathieu - */ -static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) +static int cpufreq_online(unsigned int cpu) { - unsigned int j, cpu = dev->id; - int ret; struct cpufreq_policy *policy; - unsigned long flags; bool recover_policy; + unsigned long flags; + unsigned int j; + int ret; - pr_debug("adding CPU %u\n", cpu); - - if (cpu_is_offline(cpu)) { - /* - * Only possible if we are here from the subsys_interface add - * callback. A hotplug notifier will follow and we will handle - * it as CPU online then. For now, just create the sysfs link, - * unless there is no policy or the link is already present. - */ - policy = per_cpu(cpufreq_cpu_data, cpu); - return policy && !cpumask_test_and_set_cpu(cpu, policy->real_cpus) - ? add_cpu_dev_symlink(policy, cpu) : 0; - } + pr_debug("%s: bringing CPU%u online\n", __func__, cpu); /* Check if this CPU already has a policy to manage it */ policy = per_cpu(cpufreq_cpu_data, cpu); @@ -1377,6 +1356,35 @@ out_free_policy: return ret; } +/** + * cpufreq_add_dev - the cpufreq interface for a CPU device. + * @dev: CPU device. + * @sif: Subsystem interface structure pointer (not used) + */ +static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) +{ + unsigned cpu = dev->id; + int ret; + + dev_dbg(dev, "%s: adding CPU%u\n", __func__, cpu); + + if (cpu_online(cpu)) { + ret = cpufreq_online(cpu); + } else { + /* + * A hotplug notifier will follow and we will handle it as CPU + * online then. For now, just create the sysfs link, unless + * there is no policy or the link is already present. + */ + struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu); + + ret = policy && !cpumask_test_and_set_cpu(cpu, policy->real_cpus) + ? add_cpu_dev_symlink(policy, cpu) : 0; + } + + return ret; +} + static void cpufreq_offline_prepare(unsigned int cpu) { struct cpufreq_policy *policy; @@ -2340,27 +2348,23 @@ static int cpufreq_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { unsigned int cpu = (unsigned long)hcpu; - struct device *dev; - dev = get_cpu_device(cpu); - if (dev) { - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_ONLINE: - cpufreq_add_dev(dev, NULL); - break; + switch (action & ~CPU_TASKS_FROZEN) { + case CPU_ONLINE: + cpufreq_online(cpu); + break; - case CPU_DOWN_PREPARE: - cpufreq_offline_prepare(cpu); - break; + case CPU_DOWN_PREPARE: + cpufreq_offline_prepare(cpu); + break; - case CPU_POST_DEAD: - cpufreq_offline_finish(cpu); - break; + case CPU_POST_DEAD: + cpufreq_offline_finish(cpu); + break; - case CPU_DOWN_FAILED: - cpufreq_add_dev(dev, NULL); - break; - } + case CPU_DOWN_FAILED: + cpufreq_online(cpu); + break; } return NOTIFY_OK; } -- cgit v1.2.1 From 194d99c7e3ce54a8c7d8adf79fb1d8ad49a9bf9f Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 29 Jul 2015 03:08:57 +0200 Subject: cpufreq: Replace recover_policy with new_policy in cpufreq_online() The recover_policy is unsed in cpufreq_online() to indicate whether a new policy object is created or an existing one is reinitialized. The "recover" part of the name is slightly confusing (it should be "reinitialization" rather than "recovery") and the logical not (!) operator is applied to it in almost all of the checks it is used in, so replace that variable with a new one called "new_policy" that will be true in the case of a new policy creation. While at it, drop one of the labels that is jumped to from only one spot. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 0d46b557c016..24e4ba568e77 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1194,7 +1194,7 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy, bool notify) static int cpufreq_online(unsigned int cpu) { struct cpufreq_policy *policy; - bool recover_policy; + bool new_policy; unsigned long flags; unsigned int j; int ret; @@ -1209,13 +1209,13 @@ static int cpufreq_online(unsigned int cpu) return cpufreq_add_policy_cpu(policy, cpu); /* This is the only online CPU for the policy. Start over. */ - recover_policy = true; + new_policy = false; down_write(&policy->rwsem); policy->cpu = cpu; policy->governor = NULL; up_write(&policy->rwsem); } else { - recover_policy = false; + new_policy = true; policy = cpufreq_policy_alloc(cpu); if (!policy) return -ENOMEM; @@ -1234,7 +1234,7 @@ static int cpufreq_online(unsigned int cpu) down_write(&policy->rwsem); - if (!recover_policy) { + if (new_policy) { /* related_cpus should at least include policy->cpus. */ cpumask_or(policy->related_cpus, policy->related_cpus, policy->cpus); /* Remember CPUs present at the policy creation time. */ @@ -1247,7 +1247,7 @@ static int cpufreq_online(unsigned int cpu) */ cpumask_and(policy->cpus, policy->cpus, cpu_online_mask); - if (!recover_policy) { + if (new_policy) { policy->user_policy.min = policy->min; policy->user_policy.max = policy->max; @@ -1308,7 +1308,7 @@ static int cpufreq_online(unsigned int cpu) blocking_notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_START, policy); - if (!recover_policy) { + if (new_policy) { ret = cpufreq_add_dev_interface(policy); if (ret) goto out_exit_policy; @@ -1324,10 +1324,12 @@ static int cpufreq_online(unsigned int cpu) if (ret) { pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n", __func__, cpu, ret); - goto out_remove_policy_notify; + /* cpufreq_policy_free() will notify based on this */ + new_policy = false; + goto out_exit_policy; } - if (!recover_policy) { + if (new_policy) { policy->user_policy.policy = policy->policy; policy->user_policy.governor = policy->governor; } @@ -1343,16 +1345,13 @@ static int cpufreq_online(unsigned int cpu) return 0; -out_remove_policy_notify: - /* cpufreq_policy_free() will notify based on this */ - recover_policy = true; out_exit_policy: up_write(&policy->rwsem); if (cpufreq_driver->exit) cpufreq_driver->exit(policy); out_free_policy: - cpufreq_policy_free(policy, recover_policy); + cpufreq_policy_free(policy, !new_policy); return ret; } -- cgit v1.2.1 From fdd320da84c63092fe6e155cb7b8d80f7f765fa9 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 30 Jul 2015 01:45:07 +0200 Subject: cpufreq: Lock CPU online/offline in cpufreq_register_driver() To protect against races with concurrent CPU online/offline, call get_online_cpus() before registering a cpufreq driver. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 24e4ba568e77..0f4e96ff99e8 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2471,10 +2471,14 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) pr_debug("trying to register driver %s\n", driver_data->name); + /* Protect against concurrent CPU online/offline. */ + get_online_cpus(); + write_lock_irqsave(&cpufreq_driver_lock, flags); if (cpufreq_driver) { write_unlock_irqrestore(&cpufreq_driver_lock, flags); - return -EEXIST; + ret = -EEXIST; + goto out; } cpufreq_driver = driver_data; write_unlock_irqrestore(&cpufreq_driver_lock, flags); @@ -2513,7 +2517,10 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) register_hotcpu_notifier(&cpufreq_cpu_notifier); pr_debug("driver %s up and running\n", driver_data->name); - return 0; +out: + put_online_cpus(); + return ret; + err_if_unreg: subsys_interface_unregister(&cpufreq_interface); err_boost_unreg: @@ -2523,7 +2530,7 @@ err_null_driver: write_lock_irqsave(&cpufreq_driver_lock, flags); cpufreq_driver = NULL; write_unlock_irqrestore(&cpufreq_driver_lock, flags); - return ret; + goto out; } EXPORT_SYMBOL_GPL(cpufreq_register_driver); -- cgit v1.2.1 From fba9573b33f8bddd772195c202f6b8ec0751cedd Mon Sep 17 00:00:00 2001 From: Pan Xinhui Date: Thu, 30 Jul 2015 18:10:40 +0800 Subject: cpufreq: Correct a freq check in cpufreq_set_policy() This check was originally added by commit 9c9a43ed2734 ("[CPUFREQ] return error when failing to set minfreq").It attempt to return an error on obviously incorrect limits when we echo xxx >.../scaling_max,min_freq Actually we just need check if new_policy->min > new_policy->max. Because at least one of max/min is copied from cpufreq_get_policy(). For example, when we echo xxx > .../scaling_min_freq, new_policy is copied from policy in cpufreq_get_policy. new_policy->max is same with policy->max. new_policy->min is set to a new value. Let me explain it in deduction method, first statement in if (): new_policy->min > policy->max policy->max == new_policy->max ==> new_policy->min > new_policy->max second statement in if(): new_policy->max < policy->min policy->max < policy->min ==>new_policy->min > new_policy->max (induction method) So we have proved that we only need check if new_policy->min > new_policy->max. After apply this patch, we can also modify ->min and ->max at same time if new freq range is very much different from current freq range. For example, if current freq range is 480000-960000, then we want to set this range to 1120000-2240000, we would fail in the past because new_policy->min > policy->max. As long as the cpufreq range is valid, we has no reason to reject the user. So correct the check to avoid such case. Signed-off-by: Pan Xinhui Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 0f4e96ff99e8..76a26609d96b 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2190,7 +2190,11 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo)); - if (new_policy->min > policy->max || new_policy->max < policy->min) + /* + * This check works well when we store new min/max freq attributes, + * because new_policy is a copy of policy with one field updated. + */ + if (new_policy->min > new_policy->max) return -EINVAL; /* verify the cpu speed can be set within this limit */ -- cgit v1.2.1 From 44139ed4943ee8ec186eea3e9072ca16d2b48133 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Wed, 29 Jul 2015 16:23:09 +0530 Subject: cpufreq: Allow drivers to enable boost support after registering driver In some cases it wouldn't be known at time of driver registration, if the driver needs to support boost frequencies. For example, while getting boost information from DT with opp-v2 bindings, we need to parse the bindings for all the CPUs to know if turbo/boost OPPs are supported or not. One way out to do that efficiently is to delay supporting boost mode (i.e. creating /sys/devices/system/cpu/cpufreq/boost file), until the time OPP bindings are parsed. At that point, the driver can enable boost support. This can be done at ->init(), where the frequency table is created. To do that, the driver requires few APIs from cpufreq core that let him do this. This patch provides these APIs. Signed-off-by: Viresh Kumar Reviewed-by: Stephen Boyd Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 68 +++++++++++++++++++++++++++++++++-------------- 1 file changed, 48 insertions(+), 20 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 76a26609d96b..e48242119d77 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2437,6 +2437,49 @@ int cpufreq_boost_supported(void) } EXPORT_SYMBOL_GPL(cpufreq_boost_supported); +static int create_boost_sysfs_file(void) +{ + int ret; + + if (!cpufreq_boost_supported()) + return 0; + + /* + * Check if driver provides function to enable boost - + * if not, use cpufreq_boost_set_sw as default + */ + if (!cpufreq_driver->set_boost) + cpufreq_driver->set_boost = cpufreq_boost_set_sw; + + ret = cpufreq_sysfs_create_file(&boost.attr); + if (ret) + pr_err("%s: cannot register global BOOST sysfs file\n", + __func__); + + return ret; +} + +static void remove_boost_sysfs_file(void) +{ + if (cpufreq_boost_supported()) + cpufreq_sysfs_remove_file(&boost.attr); +} + +int cpufreq_enable_boost_support(void) +{ + if (!cpufreq_driver) + return -EINVAL; + + if (cpufreq_boost_supported()) + return 0; + + cpufreq_driver->boost_supported = true; + + /* This will get removed on driver unregister */ + return create_boost_sysfs_file(); +} +EXPORT_SYMBOL_GPL(cpufreq_enable_boost_support); + int cpufreq_boost_enabled(void) { return cpufreq_driver->boost_enabled; @@ -2490,21 +2533,9 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) if (driver_data->setpolicy) driver_data->flags |= CPUFREQ_CONST_LOOPS; - if (cpufreq_boost_supported()) { - /* - * Check if driver provides function to enable boost - - * if not, use cpufreq_boost_set_sw as default - */ - if (!cpufreq_driver->set_boost) - cpufreq_driver->set_boost = cpufreq_boost_set_sw; - - ret = cpufreq_sysfs_create_file(&boost.attr); - if (ret) { - pr_err("%s: cannot register global BOOST sysfs file\n", - __func__); - goto err_null_driver; - } - } + ret = create_boost_sysfs_file(); + if (ret) + goto err_null_driver; ret = subsys_interface_register(&cpufreq_interface); if (ret) @@ -2528,8 +2559,7 @@ out: err_if_unreg: subsys_interface_unregister(&cpufreq_interface); err_boost_unreg: - if (cpufreq_boost_supported()) - cpufreq_sysfs_remove_file(&boost.attr); + remove_boost_sysfs_file(); err_null_driver: write_lock_irqsave(&cpufreq_driver_lock, flags); cpufreq_driver = NULL; @@ -2558,9 +2588,7 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver) /* Protect against concurrent cpu hotplug */ get_online_cpus(); subsys_interface_unregister(&cpufreq_interface); - if (cpufreq_boost_supported()) - cpufreq_sysfs_remove_file(&boost.attr); - + remove_boost_sysfs_file(); unregister_hotcpu_notifier(&cpufreq_cpu_notifier); write_lock_irqsave(&cpufreq_driver_lock, flags); -- cgit v1.2.1 From 6bfb7c7434f75d29241413dc7e784295ba56de98 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Mon, 3 Aug 2015 08:36:14 +0530 Subject: cpufreq: remove redundant CPUFREQ_INCOMPATIBLE notifier event What's being done from CPUFREQ_INCOMPATIBLE, can also be done with CPUFREQ_ADJUST. There is nothing special with CPUFREQ_INCOMPATIBLE notifier. Kill CPUFREQ_INCOMPATIBLE and fix its usage sites. This also updates the numbering of notifier events to remove holes. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 4 ---- 1 file changed, 4 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 76a26609d96b..293f47b814bf 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -2206,10 +2206,6 @@ static int cpufreq_set_policy(struct cpufreq_policy *policy, blocking_notifier_call_chain(&cpufreq_policy_notifier_list, CPUFREQ_ADJUST, new_policy); - /* adjust if necessary - hardware incompatibility*/ - blocking_notifier_call_chain(&cpufreq_policy_notifier_list, - CPUFREQ_INCOMPATIBLE, new_policy); - /* * verify the cpu speed can be set within this limit, which might be * different to the first one -- cgit v1.2.1 From 8fa5b631f32238a16ae3db0db5b354f7b9eb20cb Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Mon, 3 Aug 2015 08:36:15 +0530 Subject: cpufreq: use memcpy() to copy policy cpufreq_get_policy() is useful if the pointer to policy isn't available in advance. But if it is available, then there is no need to call cpufreq_get_policy(). Directly use memcpy() to copy the policy. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 293f47b814bf..86d69416821b 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -606,9 +606,7 @@ static ssize_t store_##file_name \ int ret, temp; \ struct cpufreq_policy new_policy; \ \ - ret = cpufreq_get_policy(&new_policy, policy->cpu); \ - if (ret) \ - return -EINVAL; \ + memcpy(&new_policy, policy, sizeof(*policy)); \ \ ret = sscanf(buf, "%u", &new_policy.object); \ if (ret != 1) \ @@ -662,9 +660,7 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy, char str_governor[16]; struct cpufreq_policy new_policy; - ret = cpufreq_get_policy(&new_policy, policy->cpu); - if (ret) - return ret; + memcpy(&new_policy, policy, sizeof(*policy)); ret = sscanf(buf, "%15s", str_governor); if (ret != 1) -- cgit v1.2.1 From 14ca0bdfdd6b422027b9b733abb0bf151811eaa7 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Mon, 3 Aug 2015 08:36:16 +0530 Subject: cpufreq: update user_policy.* on success 'user_policy' caches properties of a policy that are set by userspace. And these must be updated only if cpufreq core was successful in updating them based on request from user space. In store_scaling_governor(), we are updating user_policy.policy and user_policy.governor even if cpufreq_set_policy() failed. That's incorrect. Fix this by updating user_policy.* only if we were successful in updating the properties. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 86d69416821b..8e71d8e08439 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -671,14 +671,12 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy, return -EINVAL; ret = cpufreq_set_policy(policy, &new_policy); + if (ret) + return ret; policy->user_policy.policy = policy->policy; policy->user_policy.governor = policy->governor; - - if (ret) - return ret; - else - return count; + return count; } /** -- cgit v1.2.1 From e27f8bd248756310a6df8b67f96d41d5a693642c Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Mon, 3 Aug 2015 08:36:17 +0530 Subject: cpufreq: remove redundant 'governor' field from user_policy Its always same as policy->governor, and there is no need to keep another copy of it. Remove it. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 8e71d8e08439..3033952391fe 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -675,7 +675,6 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy, return ret; policy->user_policy.policy = policy->policy; - policy->user_policy.governor = policy->governor; return count; } @@ -1323,10 +1322,9 @@ static int cpufreq_online(unsigned int cpu) goto out_exit_policy; } - if (new_policy) { + if (new_policy) policy->user_policy.policy = policy->policy; - policy->user_policy.governor = policy->governor; - } + up_write(&policy->rwsem); kobject_uevent(&policy->kobj, KOBJ_ADD); @@ -2305,7 +2303,6 @@ int cpufreq_update_policy(unsigned int cpu) new_policy.min = policy->user_policy.min; new_policy.max = policy->user_policy.max; new_policy.policy = policy->user_policy.policy; - new_policy.governor = policy->user_policy.governor; /* * BIOS might change freq behind our back -- cgit v1.2.1 From 88dc4384958759510db248bf9158434ac783d407 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Mon, 3 Aug 2015 08:36:18 +0530 Subject: cpufreq: remove redundant 'policy' field from user_policy Its always same as policy->policy, and there is no need to keep another copy of it. Remove it. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 3033952391fe..a80bd68bbd74 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -671,11 +671,7 @@ static ssize_t store_scaling_governor(struct cpufreq_policy *policy, return -EINVAL; ret = cpufreq_set_policy(policy, &new_policy); - if (ret) - return ret; - - policy->user_policy.policy = policy->policy; - return count; + return ret ? ret : count; } /** @@ -1322,9 +1318,6 @@ static int cpufreq_online(unsigned int cpu) goto out_exit_policy; } - if (new_policy) - policy->user_policy.policy = policy->policy; - up_write(&policy->rwsem); kobject_uevent(&policy->kobj, KOBJ_ADD); @@ -2302,7 +2295,6 @@ int cpufreq_update_policy(unsigned int cpu) memcpy(&new_policy, policy, sizeof(*policy)); new_policy.min = policy->user_policy.min; new_policy.max = policy->user_policy.max; - new_policy.policy = policy->user_policy.policy; /* * BIOS might change freq behind our back -- cgit v1.2.1 From 36dfef23cd26a6d3b71dd86509e34d311f1cd906 Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Mon, 3 Aug 2015 08:36:20 +0530 Subject: cpufreq: drop !cpufreq_driver check from cpufreq_parse_governor() Driver is guaranteed to be present on a call to cpufreq_parse_governor() and there is no need to check for !cpufreq_driver. Drop it. Signed-off-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/cpufreq.c | 4 ---- 1 file changed, 4 deletions(-) (limited to 'drivers/cpufreq/cpufreq.c') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index a80bd68bbd74..a05cc75cc45d 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -520,9 +520,6 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy, { int err = -EINVAL; - if (!cpufreq_driver) - goto out; - if (cpufreq_driver->setpolicy) { if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) { *policy = CPUFREQ_POLICY_PERFORMANCE; @@ -557,7 +554,6 @@ static int cpufreq_parse_governor(char *str_governor, unsigned int *policy, mutex_unlock(&cpufreq_governor_mutex); } -out: return err; } -- cgit v1.2.1