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Linux power: 电源控制(pwrctrl)的架构和软件接口使用方法

  • 2026-03-16 05:16:04
Linux power: 电源控制(pwrctrl)的架构和软件接口使用方法

knowledge base:

Linux PCIe 电源管理软件架构与流程

PCIe power之ASPM工作原理及软件使能流程

PCIe power: D3hot/D3cold进入流程及软件实现

一、Linux 电源管理架构

  1. 1. 整体架构层次
┌─────────────────────────────────────────┐
│  用户空间 (User Space)                   │
│  - systemctl / pm-utils / powertop      │
│  - 应用程序电源管理接口                  │
├─────────────────────────────────────────┤
│  系统调用接口 (Syscall Interface)        │
│  - /sys/power/state                     │
│  - /sys/power/mem_sleep                 │
├─────────────────────────────────────────┤
│  电源管理核心 (PM Core)                  │
│  - PM Subsystem                         │
│  - Device PM                            │
│  - CPU PM / CPUFreq                     │
├─────────────────────────────────────────┤
│  设备驱动层 (Device Drivers)             │
│  - Platform Driver                      │
│  - Device Driver PM Ops                 │
├─────────────────────────────────────────┤
│  硬件抽象层 (Hardware Abstraction)       │
│  - ACPI / PSCI / DT                     │
├─────────────────────────────────────────┤
│  硬件层 (Hardware)                       │
│  - SoC Power Controller                 │
│  - PMIC / Regulator                     │
└─────────────────────────────────────────┘
  1. 2. 核心组件说明

二、软件接口使用流程

  1. 1. 系统级电源控制接口

1.1 Sysfs 接口(用户空间)

# 查看可用电源状态
cat
 /sys/power/state          # 显示支持的挂起状态: freeze standby mem disk
cat
 /sys/power/mem_sleep      # 显示支持的内存睡眠模式: s2idle shallow deep

# 触发系统挂起

echo
 freeze > /sys/power/state    # 冻结(最轻)
echo
 standby > /sys/power/state   # 待机
echo
 mem > /sys/power/state       # 内存睡眠(S3)
echo
 disk > /sys/power/state      # 休眠到磁盘(S4)

# 设置内存睡眠模式

echo
 deep > /sys/power/mem_sleep  # 设置深度睡眠

1.2 内核编程接口

#include <linux/suspend.h>
#include <linux/pm.h>


// 1. 注册系统挂起通知

static
 int my_pm_notifier(struct notifier_block *nb,
                          unsigned
 long event, void *ptr)

{
    switch
 (event) {
    case
 PM_SUSPEND_PREPARE:    // 准备挂起
        // 保存设备状态

        break
;
    case
 PM_POST_SUSPEND:       // 恢复完成
        // 恢复设备状态

        break
;
    }
    return
 NOTIFY_OK;
}

static
 struct notifier_block my_pm_nb = {
    .notifier_call = my_pm_notifier,
};

// 注册

pm_notifier(my_pm_nb, 0);

// 2. 设备电源管理操作

static
 int my_dev_suspend(struct device *dev, pm_message_t state)
{
    // 设备挂起处理

    return
 0;
}

static
 int my_dev_resume(struct device *dev)
{
    // 设备恢复处理

    return
 0;
}

static
 const struct dev_pm_ops my_dev_pm_ops = {
    .suspend = my_dev_suspend,
    .resume = my_dev_resume,
    .freeze = my_dev_suspend,
    .thaw = my_dev_resume,
    .poweroff = my_dev_suspend,
    .restore = my_dev_resume,
};
  1. 2. 运行时电源管理(Runtime PM)

2.1 核心接口使用流程

#include <linux/pm_runtime.h>

// ===== 设备驱动初始化流程 =====

int
 my_probe(struct platform_device *pdev)
{
    struct device *dev =
 &pdev->dev;

    // 1. 使能Runtime PM(默认挂起状态)

    pm_runtime_enable(dev);

    // 2. 设置自动挂起延迟(可选)

    pm_runtime_set_autosuspend_delay(dev, 500); // 500ms延迟

    // 3. 使用自动挂起(可选)

    pm_runtime_use_autosuspend(dev);

    return
 0;
}

int
 my_remove(struct platform_device *pdev)
{
    struct device *dev =
 &pdev->dev;

    // 禁用Runtime PM

    pm_runtime_disable(dev);
    return
 0;
}

// ===== 设备操作时的电源控制 =====

int
 my_open(struct inode *inode, struct file *file)
{
    struct device *dev =
 ...;

    // 1. 获取设备(唤醒设备)

    int
 ret = pm_runtime_get_sync(dev);
    if
 (ret < 0)
        return
 ret;

    // 设备现在处于active状态,可以操作

    // ...


    return
 0;
}

int
 my_release(struct inode *inode, struct file *file)
{
    struct device *dev =
 ...;

    // 2. 释放设备(允许挂起)

    pm_runtime_put_sync(dev);  // 同步版本
    // 或 pm_runtime_put(dev);     // 异步版本


    return
 0;
}

// ===== 回调函数实现 =====

static
 int my_runtime_suspend(struct device *dev)
{
    // 执行硬件层面的挂起操作

    // 关闭时钟、降低电压等

    return
 0;
}

static
 int my_runtime_resume(struct device *dev)
{
    // 执行硬件层面的恢复操作

    // 开启时钟、恢复电压等

    return
 0;
}

static
 const struct dev_pm_ops my_pm_ops = {
    .runtime_suspend = my_runtime_suspend,
    .runtime_resume = my_runtime_resume,
};

2.2 Runtime PM 状态机

                    ┌─────────┐
        ┌──────────│ active  │◄────────┐
        │          └────┬────┘         │
   resume/suspend      │               │
        │         idle │               │
        │              ▼               │
        │          ┌─────────┐         │
        └─────────►│  idle   │─────────┘
                   └────┬────┘   autosuspend
                        │
                        ▼
                   ┌─────────┐
                   │ suspended│
                   └─────────┘
  1. 3. 设备电源域(Power Domain)管理
#include <linux/pm_domain.h>

// 1. 定义电源域

static
 struct generic_pm_domain my_pd = {
    .name = "my_power_domain",
    .power_off = my_pd_power_off,    // 关电回调
    .power_on = my_pd_power_on,      // 上电回调
};

// 2. 注册电源域

int
 __init my_pd_init(void)
{
    pm_genpd_init(&my_pd, NULL, false);
    of_genpd_add_provider_simple(pdev->dev.of_node, &my_pd);
    return
 0;
}

// 3. 设备关联电源域(在设备树中)

/*
 * device-tree:
 * my_device@1000 {
 *     ...
 *     power-domains = <&my_pd>;
 * };
 */


// 4. 运行时自动处理

// 当设备调用 pm_runtime_put() 时,如果domain内所有设备都idle,

// 电源域会自动power_off
  1. 4. 调节器(Regulator)控制接口
#include <linux/regulator/consumer.h>

// 1. 获取调节器句柄

struct regulator *reg =
 regulator_get(dev, "vcc-io");
if
 (IS_ERR(reg))
    return
 PTR_ERR(reg);

// 2. 使能/禁用调节器

int
 ret = regulator_enable(reg);    // 上电
ret = regulator_disable(reg);       // 断电

// 3. 设置电压

ret = regulator_set_voltage(reg, 1800000, 3300000); // min, max uV

// 4. 获取当前电压

int
 uV = regulator_get_voltage(reg);

// 5. 设置工作模式(效率 vs 性能)

ret = regulator_set_mode(reg, REGULATOR_MODE_STANDBY);  // 低功耗
ret = regulator_set_mode(reg, REGULATOR_MODE_NORMAL);     // 正常
ret = regulator_set_mode(reg, REGULATOR_MODE_FAST);      // 高性能

// 6. 释放

regulator_put(reg);
  1. 5. 时钟控制接口
#include <linux/clk.h>

// 1. 获取时钟

struct clk *clk =
 clk_get(dev, "bus_clk");
if
 (IS_ERR(clk))
    return
 PTR_ERR(clk);

// 2. 准备/使能时钟

clk_prepare_enable(clk);    // 原子操作:准备+使能

// 3. 禁用/取消准备

clk_disable_unprepare(clk);

// 4. 设置频率

clk_set_rate(clk, 100000000);  // 设置100MHz

// 5. 获取频率

unsigned
 long rate = clk_get_rate(clk);

// 6. 释放

clk_put(clk);

三、完整使用流程示例

场景:嵌入式设备的电源管理驱动

#include <linux/module.h>
#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/regulator/consumer.h>

#include <linux/clk.h>


struct my_dev_data {

    struct regulator *reg;

    struct clk *clk;

    void
 __iomem *regs;
};

// 设备级挂起

static
 int my_suspend(struct device *dev)
{
    struct my_dev_data *priv =
 dev_get_drvdata(dev);

    // 1. 保存寄存器状态

    // ...


    // 2. 禁用时钟

    clk_disable_unprepare(priv->clk);

    // 3. 降低电压

    regulator_set_voltage(priv->reg, 800000, 800000); // 0.8V

    return
 0;
}

// 设备级恢复

static
 int my_resume(struct device *dev)
{
    struct my_dev_data *priv =
 dev_get_drvdata(dev);

    // 1. 恢复电压

    regulator_set_voltage(priv->reg, 3300000, 3300000); // 3.3V

    // 2. 使能时钟

    clk_prepare_enable(priv->clk);

    // 3. 恢复寄存器状态

    // ...


    return
 0;
}

// Runtime PM回调

static
 int my_runtime_suspend(struct device *dev)
{
    return
 my_suspend(dev);
}

static
 int my_runtime_resume(struct device *dev)
{
    return
 my_resume(dev);
}

static
 const struct dev_pm_ops my_pm_ops = {
    .suspend = my_suspend,
    .resume = my_resume,
    .runtime_suspend = my_runtime_suspend,
    .runtime_resume = my_runtime_resume,
};

static
 int my_probe(struct platform_device *pdev)
{
    struct device *dev =
 &pdev->dev;
    struct my_dev_data *priv;


    priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
    if
 (!priv)
        return
 -ENOMEM;

    // 获取资源

    priv->reg = devm_regulator_get(dev, "vcc");
    priv->clk = devm_clk_get(dev, "bus");
    priv->regs = devm_platform_ioremap_resource(pdev, 0);

    // 初始化硬件

    regulator_enable(priv->reg);
    clk_prepare_enable(priv->clk);

    // 设置Runtime PM

    pm_runtime_set_active(dev);
    pm_runtime_enable(dev);
    pm_runtime_set_autosuspend_delay(dev, 100);
    pm_runtime_use_autosuspend(dev);

    dev_set_drvdata(dev, priv);
    return
 0;
}

static
 int my_remove(struct platform_device *pdev)
{
    struct device *dev =
 &pdev->dev;
    struct my_dev_data *priv =
 dev_get_drvdata(dev);

    pm_runtime_disable(dev);

    clk_disable_unprepare(priv->clk);
    regulator_disable(priv->reg);

    return
 0;
}

// 用户操作接口

static
 ssize_t my_read(struct file *file, char __user *buf,
                       size_t
 count, loff_t *ppos)

{
    struct device *dev =
 file->private_data;
    int
 ret;

    // 确保设备active

    ret = pm_runtime_get_sync(dev);
    if
 (ret < 0)
        return
 ret;

    // 执行读取操作

    // ...


    // 允许设备idle

    pm_runtime_mark_last_busy(dev);
    pm_runtime_put_autosuspend(dev);

    return
 count;
}

static
 struct platform_driver my_driver = {
    .probe = my_probe,
    .remove = my_remove,
    .driver = {
        .name = "my_pwr_device",
        .pm = &my_pm_ops,
    },
};

module_platform_driver(my_driver);

四、调试与监控

# 查看Runtime PM状态
cat
 /sys/devices/.../power/runtime_status    # active/suspended
cat
 /sys/devices/.../power/runtime_suspended_time
cat
 /sys/devices/.../power/runtime_active_time

# 查看系统电源统计

cat
 /sys/kernel/debug/pm_debug/suspend_stats

# 查看调节器状态

cat
 /sys/kernel/debug/regulator/regulator_summary

# 查看时钟状态

cat
 /sys/kernel/debug/clk/clk_summary

五、关键设计原则

  1. 1. 分层管理:系统级 → 设备级 → 硬件级,层层递进
  2. 2. 状态保存:挂起前保存上下文,恢复时还原
  3. 3. 引用计数:Runtime PM 使用 get/put 确保正确性
  4. 4. 延迟优化:使用 autosuspend 减少频繁开关
  5. 5. 依赖管理:通过电源域处理设备间依赖关系

这套架构提供了从系统级到设备级的完整电源管理能力,开发者可以根据硬件特性选择合适的控制粒度。


   
 

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  1. CONNECT:[ UseTime:0.000919s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002512s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000738s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003793s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001387s ]
  6. SELECT * FROM `set` [ RunTime:0.023496s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001768s ]
  8. SELECT * FROM `article` WHERE `id` = 480279 LIMIT 1 [ RunTime:0.001040s ]
  9. UPDATE `article` SET `lasttime` = 1774582171 WHERE `id` = 480279 [ RunTime:0.004512s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000683s ]
  11. SELECT * FROM `article` WHERE `id` < 480279 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001098s ]
  12. SELECT * FROM `article` WHERE `id` > 480279 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001736s ]
  13. SELECT * FROM `article` WHERE `id` < 480279 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009738s ]
  14. SELECT * FROM `article` WHERE `id` < 480279 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.018609s ]
  15. SELECT * FROM `article` WHERE `id` < 480279 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009477s ]
0.263589s