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cpufreq: create cpu/cpufreq/policyX directories

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The cpufreq sysfs interface had been a bit inconsistent as one of the
CPUs for a policy had a real directory within its sysfs 'cpuX' directory
and all other CPUs had links to it. That also made the code a bit
complex as we need to take care of moving the sysfs directory if the CPU
containing the real directory is getting physically hot-unplugged.

Solve this by creating 'policyX' directories (per-policy) in
/sys/devices/system/cpu/cpufreq/ directory, where X is the CPU for which
the policy was first created.

This also removes the need of keeping kobj_cpu and we can remove it now.

Suggested-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Saravana Kannan <skannan@codeaurora.org>
Acked-by: is more of a general agreement from the person that he is
Reviewed-by: is a more strict tag and implies that the reviewer has
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar 2015-10-15 21:35:24 +05:30 committed by Rafael J. Wysocki
parent c82bd44437
commit 96bdda61f5
2 changed files with 4 additions and 31 deletions
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34
drivers/cpufreq/cpufreq.c
View file

@ -910,9 +910,6 @@ static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy)
/* Some related CPUs might not be present (physically hotplugged) */
for_each_cpu(j, policy->real_cpus) {
if (j == policy->kobj_cpu)
continue;
ret = add_cpu_dev_symlink(policy, j);
if (ret)
break;
@ -926,12 +923,8 @@ static void cpufreq_remove_dev_symlink(struct cpufreq_policy *policy)
unsigned int j;
/* Some related CPUs might not be present (physically hotplugged) */
for_each_cpu(j, policy->real_cpus) {
if (j == policy->kobj_cpu)
continue;
for_each_cpu(j, policy->real_cpus)
remove_cpu_dev_symlink(policy, j);
}
}
static int cpufreq_add_dev_interface(struct cpufreq_policy *policy)
@ -1047,8 +1040,8 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL))
goto err_free_rcpumask;
ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq, &dev->kobj,
"cpufreq");
ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
cpufreq_global_kobject, "policy%u", cpu);
if (ret) {
pr_err("%s: failed to init policy->kobj: %d\n", __func__, ret);
goto err_free_real_cpus;
@ -1062,10 +1055,6 @@ static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
INIT_WORK(&policy->update, handle_update);
policy->cpu = cpu;
/* Set this once on allocation */
policy->kobj_cpu = cpu;
return policy;
err_free_real_cpus:
@ -1417,22 +1406,7 @@ static void cpufreq_remove_dev(struct device *dev, struct subsys_interface *sif)
return;
}
if (cpu != policy->kobj_cpu) {
remove_cpu_dev_symlink(policy, cpu);
} else {
/*
* The CPU owning the policy object is going away. Move it to
* another suitable CPU.
*/
unsigned int new_cpu = cpumask_first(policy->real_cpus);
struct device *new_dev = get_cpu_device(new_cpu);
dev_dbg(dev, "%s: Moving policy object to CPU%u\n", __func__, new_cpu);
sysfs_remove_link(&new_dev->kobj, "cpufreq");
policy->kobj_cpu = new_cpu;
WARN_ON(kobject_move(&policy->kobj, &new_dev->kobj));
}
remove_cpu_dev_symlink(policy, cpu);
}
static void handle_update(struct work_struct *work)

1
include/linux/cpufreq.h
View file

@ -65,7 +65,6 @@ struct cpufreq_policy {
unsigned int shared_type; /* ACPI: ANY or ALL affected CPUs
should set cpufreq */
unsigned int cpu; /* cpu managing this policy, must be online */
unsigned int kobj_cpu; /* cpu managing sysfs files, can be offline */
struct clk *clk;
struct cpufreq_cpuinfo cpuinfo;/* see above */