660 lines
16 KiB
C
660 lines
16 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/completion.h>
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#include <linux/capability.h>
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#include <linux/device.h>
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#include <linux/kobject.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)) -
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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 *drv;
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spin_lock(&cpuidle_driver_lock);
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drv = cpuidle_get_driver();
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if (drv)
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ret = sprintf(buf, "%s\n", drv->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 attr_to_cpuidleattr(a) container_of(a, struct cpuidle_attr, attr)
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struct cpuidle_device_kobj {
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struct cpuidle_device *dev;
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struct completion kobj_unregister;
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struct kobject kobj;
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};
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static inline struct cpuidle_device *to_cpuidle_device(struct kobject *kobj)
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{
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struct cpuidle_device_kobj *kdev =
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container_of(kobj, struct cpuidle_device_kobj, kobj);
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return kdev->dev;
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}
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static ssize_t cpuidle_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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int ret = -EIO;
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struct cpuidle_device *dev = to_cpuidle_device(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 = to_cpuidle_device(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_kobj *kdev =
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container_of(kobj, struct cpuidle_device_kobj, kobj);
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complete(&kdev->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, \
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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, \
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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(target_residency)
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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(residency, show_state_target_residency);
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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_residency.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, struct attribute *attr,
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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, struct attribute *attr,
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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_state_sysfs - adds cpuidle states sysfs attributes
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* @device: the target device
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*/
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static 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_device_kobj *kdev = device->kobj_dev;
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struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
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/* state statistics */
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for (i = 0; i < drv->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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&kdev->kobj, "state%d", i);
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if (ret) {
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kobject_put(&kobj->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 the cpuidle states sysfs attributes
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* @device: the target device
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*/
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static void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
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{
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struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
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int i;
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for (i = 0; i < drv->state_count; i++)
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cpuidle_free_state_kobj(device, i);
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}
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#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
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#define kobj_to_driver_kobj(k) container_of(k, struct cpuidle_driver_kobj, kobj)
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#define attr_to_driver_attr(a) container_of(a, struct cpuidle_driver_attr, attr)
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#define define_one_driver_ro(_name, show) \
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static struct cpuidle_driver_attr attr_driver_##_name = \
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__ATTR(_name, 0444, show, NULL)
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struct cpuidle_driver_kobj {
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struct cpuidle_driver *drv;
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struct completion kobj_unregister;
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struct kobject kobj;
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};
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struct cpuidle_driver_attr {
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struct attribute attr;
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ssize_t (*show)(struct cpuidle_driver *, char *);
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ssize_t (*store)(struct cpuidle_driver *, const char *, size_t);
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};
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static ssize_t show_driver_name(struct cpuidle_driver *drv, char *buf)
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{
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ssize_t ret;
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spin_lock(&cpuidle_driver_lock);
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ret = sprintf(buf, "%s\n", drv ? drv->name : "none");
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spin_unlock(&cpuidle_driver_lock);
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return ret;
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}
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static void cpuidle_driver_sysfs_release(struct kobject *kobj)
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{
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struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
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complete(&driver_kobj->kobj_unregister);
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}
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static ssize_t cpuidle_driver_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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int ret = -EIO;
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struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
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struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
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if (dattr->show)
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ret = dattr->show(driver_kobj->drv, buf);
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return ret;
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}
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static ssize_t cpuidle_driver_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t size)
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{
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int ret = -EIO;
|
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struct cpuidle_driver_kobj *driver_kobj = kobj_to_driver_kobj(kobj);
|
|
struct cpuidle_driver_attr *dattr = attr_to_driver_attr(attr);
|
|
|
|
if (dattr->store)
|
|
ret = dattr->store(driver_kobj->drv, buf, size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
define_one_driver_ro(name, show_driver_name);
|
|
|
|
static const struct sysfs_ops cpuidle_driver_sysfs_ops = {
|
|
.show = cpuidle_driver_show,
|
|
.store = cpuidle_driver_store,
|
|
};
|
|
|
|
static struct attribute *cpuidle_driver_default_attrs[] = {
|
|
&attr_driver_name.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct kobj_type ktype_driver_cpuidle = {
|
|
.sysfs_ops = &cpuidle_driver_sysfs_ops,
|
|
.default_attrs = cpuidle_driver_default_attrs,
|
|
.release = cpuidle_driver_sysfs_release,
|
|
};
|
|
|
|
/**
|
|
* cpuidle_add_driver_sysfs - adds the driver name sysfs attribute
|
|
* @device: the target device
|
|
*/
|
|
static int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
|
|
{
|
|
struct cpuidle_driver_kobj *kdrv;
|
|
struct cpuidle_device_kobj *kdev = dev->kobj_dev;
|
|
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
|
|
int ret;
|
|
|
|
kdrv = kzalloc(sizeof(*kdrv), GFP_KERNEL);
|
|
if (!kdrv)
|
|
return -ENOMEM;
|
|
|
|
kdrv->drv = drv;
|
|
init_completion(&kdrv->kobj_unregister);
|
|
|
|
ret = kobject_init_and_add(&kdrv->kobj, &ktype_driver_cpuidle,
|
|
&kdev->kobj, "driver");
|
|
if (ret) {
|
|
kobject_put(&kdrv->kobj);
|
|
return ret;
|
|
}
|
|
|
|
kobject_uevent(&kdrv->kobj, KOBJ_ADD);
|
|
dev->kobj_driver = kdrv;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* cpuidle_remove_driver_sysfs - removes the driver name sysfs attribute
|
|
* @device: the target device
|
|
*/
|
|
static void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
|
|
{
|
|
struct cpuidle_driver_kobj *kdrv = dev->kobj_driver;
|
|
kobject_put(&kdrv->kobj);
|
|
wait_for_completion(&kdrv->kobj_unregister);
|
|
kfree(kdrv);
|
|
}
|
|
#else
|
|
static inline int cpuidle_add_driver_sysfs(struct cpuidle_device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void cpuidle_remove_driver_sysfs(struct cpuidle_device *dev)
|
|
{
|
|
;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* cpuidle_add_device_sysfs - adds device specific sysfs attributes
|
|
* @device: the target device
|
|
*/
|
|
int cpuidle_add_device_sysfs(struct cpuidle_device *device)
|
|
{
|
|
int ret;
|
|
|
|
ret = cpuidle_add_state_sysfs(device);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = cpuidle_add_driver_sysfs(device);
|
|
if (ret)
|
|
cpuidle_remove_state_sysfs(device);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* cpuidle_remove_device_sysfs : removes device specific sysfs attributes
|
|
* @device : the target device
|
|
*/
|
|
void cpuidle_remove_device_sysfs(struct cpuidle_device *device)
|
|
{
|
|
cpuidle_remove_driver_sysfs(device);
|
|
cpuidle_remove_state_sysfs(device);
|
|
}
|
|
|
|
/**
|
|
* cpuidle_add_sysfs - creates a sysfs instance for the target device
|
|
* @dev: the target device
|
|
*/
|
|
int cpuidle_add_sysfs(struct cpuidle_device *dev)
|
|
{
|
|
struct cpuidle_device_kobj *kdev;
|
|
struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
|
|
int error;
|
|
|
|
/*
|
|
* Return if cpu_device is not setup for this CPU.
|
|
*
|
|
* This could happen if the arch did not set up cpu_device
|
|
* since this CPU is not in cpu_present mask and the
|
|
* driver did not send a correct CPU mask during registration.
|
|
* Without this check we would end up passing bogus
|
|
* value for &cpu_dev->kobj in kobject_init_and_add()
|
|
*/
|
|
if (!cpu_dev)
|
|
return -ENODEV;
|
|
|
|
kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
|
|
if (!kdev)
|
|
return -ENOMEM;
|
|
kdev->dev = dev;
|
|
dev->kobj_dev = kdev;
|
|
|
|
init_completion(&kdev->kobj_unregister);
|
|
|
|
error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
|
|
"cpuidle");
|
|
if (error) {
|
|
kobject_put(&kdev->kobj);
|
|
return error;
|
|
}
|
|
|
|
kobject_uevent(&kdev->kobj, KOBJ_ADD);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* cpuidle_remove_sysfs - deletes a sysfs instance on the target device
|
|
* @dev: the target device
|
|
*/
|
|
void cpuidle_remove_sysfs(struct cpuidle_device *dev)
|
|
{
|
|
struct cpuidle_device_kobj *kdev = dev->kobj_dev;
|
|
|
|
kobject_put(&kdev->kobj);
|
|
wait_for_completion(&kdev->kobj_unregister);
|
|
kfree(kdev);
|
|
}
|