![Daniel Lezcano](/assets/img/avatar_default.png)
The structure cpuidle_state_kobj is not used anywhere except in the sysfs.c file. The definition of this structure is not needed in the cpuidle header file. This patch moves it to the sysfs.c file in order to encapsulate the code a bit more. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
441 lines
11 KiB
C
441 lines
11 KiB
C
/*
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* sysfs.c - sysfs support
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*
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* (C) 2006-2007 Shaohua Li <shaohua.li@intel.com>
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*
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* This code is licenced under the GPL.
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*/
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#include <linux/kernel.h>
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#include <linux/cpuidle.h>
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#include <linux/sysfs.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/capability.h>
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#include "cpuidle.h"
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static unsigned int sysfs_switch;
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static int __init cpuidle_sysfs_setup(char *unused)
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{
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sysfs_switch = 1;
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return 1;
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}
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__setup("cpuidle_sysfs_switch", cpuidle_sysfs_setup);
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static ssize_t show_available_governors(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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ssize_t i = 0;
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struct cpuidle_governor *tmp;
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mutex_lock(&cpuidle_lock);
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list_for_each_entry(tmp, &cpuidle_governors, governor_list) {
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if (i >= (ssize_t) ((PAGE_SIZE/sizeof(char)) - CPUIDLE_NAME_LEN - 2))
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goto out;
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i += scnprintf(&buf[i], CPUIDLE_NAME_LEN, "%s ", tmp->name);
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}
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out:
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i+= sprintf(&buf[i], "\n");
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mutex_unlock(&cpuidle_lock);
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return i;
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}
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static ssize_t show_current_driver(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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ssize_t ret;
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struct cpuidle_driver *cpuidle_driver = cpuidle_get_driver();
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spin_lock(&cpuidle_driver_lock);
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if (cpuidle_driver)
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ret = sprintf(buf, "%s\n", cpuidle_driver->name);
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else
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ret = sprintf(buf, "none\n");
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spin_unlock(&cpuidle_driver_lock);
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return ret;
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}
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static ssize_t show_current_governor(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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ssize_t ret;
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mutex_lock(&cpuidle_lock);
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if (cpuidle_curr_governor)
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ret = sprintf(buf, "%s\n", cpuidle_curr_governor->name);
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else
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ret = sprintf(buf, "none\n");
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mutex_unlock(&cpuidle_lock);
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return ret;
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}
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static ssize_t store_current_governor(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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char gov_name[CPUIDLE_NAME_LEN];
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int ret = -EINVAL;
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size_t len = count;
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struct cpuidle_governor *gov;
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if (!len || len >= sizeof(gov_name))
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return -EINVAL;
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memcpy(gov_name, buf, len);
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gov_name[len] = '\0';
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if (gov_name[len - 1] == '\n')
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gov_name[--len] = '\0';
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mutex_lock(&cpuidle_lock);
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list_for_each_entry(gov, &cpuidle_governors, governor_list) {
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if (strlen(gov->name) == len && !strcmp(gov->name, gov_name)) {
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ret = cpuidle_switch_governor(gov);
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break;
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}
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}
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mutex_unlock(&cpuidle_lock);
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if (ret)
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return ret;
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else
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return count;
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}
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static DEVICE_ATTR(current_driver, 0444, show_current_driver, NULL);
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static DEVICE_ATTR(current_governor_ro, 0444, show_current_governor, NULL);
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static struct attribute *cpuidle_default_attrs[] = {
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&dev_attr_current_driver.attr,
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&dev_attr_current_governor_ro.attr,
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NULL
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};
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static DEVICE_ATTR(available_governors, 0444, show_available_governors, NULL);
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static DEVICE_ATTR(current_governor, 0644, show_current_governor,
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store_current_governor);
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static struct attribute *cpuidle_switch_attrs[] = {
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&dev_attr_available_governors.attr,
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&dev_attr_current_driver.attr,
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&dev_attr_current_governor.attr,
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NULL
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};
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static struct attribute_group cpuidle_attr_group = {
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.attrs = cpuidle_default_attrs,
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.name = "cpuidle",
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};
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/**
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* cpuidle_add_interface - add CPU global sysfs attributes
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*/
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int cpuidle_add_interface(struct device *dev)
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{
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if (sysfs_switch)
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cpuidle_attr_group.attrs = cpuidle_switch_attrs;
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return sysfs_create_group(&dev->kobj, &cpuidle_attr_group);
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}
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/**
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* cpuidle_remove_interface - remove CPU global sysfs attributes
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*/
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void cpuidle_remove_interface(struct device *dev)
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{
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sysfs_remove_group(&dev->kobj, &cpuidle_attr_group);
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}
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struct cpuidle_attr {
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struct attribute attr;
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ssize_t (*show)(struct cpuidle_device *, char *);
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ssize_t (*store)(struct cpuidle_device *, const char *, size_t count);
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};
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#define define_one_ro(_name, show) \
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static struct cpuidle_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
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#define define_one_rw(_name, show, store) \
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static struct cpuidle_attr attr_##_name = __ATTR(_name, 0644, show, store)
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#define kobj_to_cpuidledev(k) container_of(k, struct cpuidle_device, kobj)
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#define attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
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static ssize_t cpuidle_show(struct kobject * kobj, struct attribute * attr ,char * buf)
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{
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int ret = -EIO;
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struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
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struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
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if (cattr->show) {
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mutex_lock(&cpuidle_lock);
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ret = cattr->show(dev, buf);
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mutex_unlock(&cpuidle_lock);
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}
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return ret;
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}
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static ssize_t cpuidle_store(struct kobject * kobj, struct attribute * attr,
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const char * buf, size_t count)
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{
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int ret = -EIO;
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struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
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struct cpuidle_attr * cattr = attr_to_cpuidleattr(attr);
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if (cattr->store) {
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mutex_lock(&cpuidle_lock);
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ret = cattr->store(dev, buf, count);
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mutex_unlock(&cpuidle_lock);
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}
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return ret;
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}
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static const struct sysfs_ops cpuidle_sysfs_ops = {
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.show = cpuidle_show,
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.store = cpuidle_store,
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};
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static void cpuidle_sysfs_release(struct kobject *kobj)
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{
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struct cpuidle_device *dev = kobj_to_cpuidledev(kobj);
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complete(&dev->kobj_unregister);
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}
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static struct kobj_type ktype_cpuidle = {
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.sysfs_ops = &cpuidle_sysfs_ops,
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.release = cpuidle_sysfs_release,
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};
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struct cpuidle_state_attr {
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struct attribute attr;
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ssize_t (*show)(struct cpuidle_state *, \
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struct cpuidle_state_usage *, char *);
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ssize_t (*store)(struct cpuidle_state *, \
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struct cpuidle_state_usage *, const char *, size_t);
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};
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#define define_one_state_ro(_name, show) \
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static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0444, show, NULL)
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#define define_one_state_rw(_name, show, store) \
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static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store)
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#define define_show_state_function(_name) \
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static ssize_t show_state_##_name(struct cpuidle_state *state, \
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struct cpuidle_state_usage *state_usage, char *buf) \
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{ \
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return sprintf(buf, "%u\n", state->_name);\
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}
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#define define_store_state_ull_function(_name) \
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static ssize_t store_state_##_name(struct cpuidle_state *state, \
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struct cpuidle_state_usage *state_usage, \
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const char *buf, size_t size) \
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{ \
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unsigned long long value; \
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int err; \
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if (!capable(CAP_SYS_ADMIN)) \
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return -EPERM; \
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err = kstrtoull(buf, 0, &value); \
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if (err) \
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return err; \
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if (value) \
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state_usage->_name = 1; \
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else \
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state_usage->_name = 0; \
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return size; \
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}
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#define define_show_state_ull_function(_name) \
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static ssize_t show_state_##_name(struct cpuidle_state *state, \
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struct cpuidle_state_usage *state_usage, char *buf) \
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{ \
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return sprintf(buf, "%llu\n", state_usage->_name);\
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}
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#define define_show_state_str_function(_name) \
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static ssize_t show_state_##_name(struct cpuidle_state *state, \
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struct cpuidle_state_usage *state_usage, char *buf) \
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{ \
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if (state->_name[0] == '\0')\
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return sprintf(buf, "<null>\n");\
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return sprintf(buf, "%s\n", state->_name);\
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}
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define_show_state_function(exit_latency)
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define_show_state_function(power_usage)
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define_show_state_ull_function(usage)
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define_show_state_ull_function(time)
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define_show_state_str_function(name)
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define_show_state_str_function(desc)
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define_show_state_ull_function(disable)
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define_store_state_ull_function(disable)
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define_one_state_ro(name, show_state_name);
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define_one_state_ro(desc, show_state_desc);
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define_one_state_ro(latency, show_state_exit_latency);
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define_one_state_ro(power, show_state_power_usage);
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define_one_state_ro(usage, show_state_usage);
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define_one_state_ro(time, show_state_time);
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define_one_state_rw(disable, show_state_disable, store_state_disable);
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static struct attribute *cpuidle_state_default_attrs[] = {
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&attr_name.attr,
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&attr_desc.attr,
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&attr_latency.attr,
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&attr_power.attr,
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&attr_usage.attr,
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&attr_time.attr,
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&attr_disable.attr,
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NULL
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};
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struct cpuidle_state_kobj {
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struct cpuidle_state *state;
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struct cpuidle_state_usage *state_usage;
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struct completion kobj_unregister;
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struct kobject kobj;
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};
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#define kobj_to_state_obj(k) container_of(k, struct cpuidle_state_kobj, kobj)
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#define kobj_to_state(k) (kobj_to_state_obj(k)->state)
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#define kobj_to_state_usage(k) (kobj_to_state_obj(k)->state_usage)
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#define attr_to_stateattr(a) container_of(a, struct cpuidle_state_attr, attr)
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static ssize_t cpuidle_state_show(struct kobject * kobj,
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struct attribute * attr ,char * buf)
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{
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int ret = -EIO;
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struct cpuidle_state *state = kobj_to_state(kobj);
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struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
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struct cpuidle_state_attr * cattr = attr_to_stateattr(attr);
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if (cattr->show)
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ret = cattr->show(state, state_usage, buf);
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return ret;
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}
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static ssize_t cpuidle_state_store(struct kobject *kobj,
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struct attribute *attr, const char *buf, size_t size)
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{
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int ret = -EIO;
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struct cpuidle_state *state = kobj_to_state(kobj);
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struct cpuidle_state_usage *state_usage = kobj_to_state_usage(kobj);
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struct cpuidle_state_attr *cattr = attr_to_stateattr(attr);
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if (cattr->store)
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ret = cattr->store(state, state_usage, buf, size);
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return ret;
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}
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static const struct sysfs_ops cpuidle_state_sysfs_ops = {
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.show = cpuidle_state_show,
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.store = cpuidle_state_store,
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};
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static void cpuidle_state_sysfs_release(struct kobject *kobj)
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{
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struct cpuidle_state_kobj *state_obj = kobj_to_state_obj(kobj);
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complete(&state_obj->kobj_unregister);
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}
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static struct kobj_type ktype_state_cpuidle = {
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.sysfs_ops = &cpuidle_state_sysfs_ops,
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.default_attrs = cpuidle_state_default_attrs,
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.release = cpuidle_state_sysfs_release,
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};
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static inline void cpuidle_free_state_kobj(struct cpuidle_device *device, int i)
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{
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kobject_put(&device->kobjs[i]->kobj);
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wait_for_completion(&device->kobjs[i]->kobj_unregister);
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kfree(device->kobjs[i]);
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device->kobjs[i] = NULL;
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}
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/**
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* cpuidle_add_driver_sysfs - adds driver-specific sysfs attributes
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* @device: the target device
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*/
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int cpuidle_add_state_sysfs(struct cpuidle_device *device)
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{
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int i, ret = -ENOMEM;
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struct cpuidle_state_kobj *kobj;
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struct cpuidle_driver *drv = cpuidle_get_driver();
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/* state statistics */
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for (i = 0; i < device->state_count; i++) {
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kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
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if (!kobj)
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goto error_state;
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kobj->state = &drv->states[i];
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kobj->state_usage = &device->states_usage[i];
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init_completion(&kobj->kobj_unregister);
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ret = kobject_init_and_add(&kobj->kobj, &ktype_state_cpuidle,
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&device->kobj, "state%d", i);
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if (ret) {
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kfree(kobj);
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goto error_state;
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}
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kobject_uevent(&kobj->kobj, KOBJ_ADD);
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device->kobjs[i] = kobj;
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}
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return 0;
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error_state:
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for (i = i - 1; i >= 0; i--)
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cpuidle_free_state_kobj(device, i);
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return ret;
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}
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/**
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* cpuidle_remove_driver_sysfs - removes driver-specific sysfs attributes
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* @device: the target device
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*/
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void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
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{
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int i;
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for (i = 0; i < device->state_count; i++)
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cpuidle_free_state_kobj(device, i);
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}
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/**
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* cpuidle_add_sysfs - creates a sysfs instance for the target device
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* @dev: the target device
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*/
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int cpuidle_add_sysfs(struct cpuidle_device *dev)
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{
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struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
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int error;
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init_completion(&dev->kobj_unregister);
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error = kobject_init_and_add(&dev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
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"cpuidle");
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if (!error)
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kobject_uevent(&dev->kobj, KOBJ_ADD);
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return error;
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}
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/**
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* cpuidle_remove_sysfs - deletes a sysfs instance on the target device
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* @dev: the target device
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*/
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void cpuidle_remove_sysfs(struct cpuidle_device *dev)
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{
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kobject_put(&dev->kobj);
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wait_for_completion(&dev->kobj_unregister);
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}
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