huchuan2025/睡眠过程分析.md at cc45289f524d54f7f7219ced6df7640779824777

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文件夹
- kernel/power/
  - main.c 模块入口 core_initcall
  - suspend.c 睡眠 to RAM
  - hibernate.c 休眠 to DISK
  - poweroff.c 关机
数据结构
- syspend的几种模式
  - #define PM_SUSPEND_ON ((__force suspend_state_t) 0)
  - #define PM_SUSPEND_TO_IDLE ((__force suspend_state_t) 1) // s2-idle sleep
  - #define PM_SUSPEND_STANDBY ((__force suspend_state_t) 2) // standby modern?
  - #define PM_SUSPEND_MEM ((__force suspend_state_t) 3) // s3 sleep
函数
pm_suspend S2 S3(deep sleep) CONFIG_SUSPEND_SKIP_SYNC
- enter_state // s2idle shallow deep
  - ksys_sync_helper // 选择是否sync CONFIG_SUSPEND_SKIP_SYNC
  - suspend_prepare // 主要就是冻结软件进程
    - suspend_freeze_processes
      - freeze_processes // 冻结用户态进程
      - freeze_kernel_threads // 冻结内核任务
  - suspend_devices_and_enter // core function
    - platform_suspend_begin
    - suspend_console // 挂起console，从此时开始console无法再输出
    - suspend_enter // power/suspend.c 进入syspend模式
      - s2 和 s3的模式在这个函数中很不一样
      - S2
        
        s2idle_loop // s2本质上是一个循环
      - S3 standby
        
        suspend_disable_secondary_cpus
        
        arch_suspend_disable_irqs -> local_irq_disable 屏蔽本核I位，但是FIQ依然可以响应
        
        syscore_suspend drivers/base/syscore.c
        
        psci_system_suspend_enter // arm64用的是psci进行电源管理
        
        cpu_suspend // arm64
        
        cpu_suspend_enter // arch/arm64/kernel/sleep.s
        
        psci_system_suspend ？ ==> bl3
  - suspend_finish

[H 86.979381374] cs: c0 pc[c023c69a] lr[c023c689] sp[c0e5bdf0] [H 86.985310124] c0 pc: [<0xc023c69a>] arch_spin_lock+0x1a/0x32 [H 86.991243291] c0 [<0xc047cd4b>] _raw_spin_lock_irqsave+0xd/0x10 [H 86.997429541] c0 [<0xc023b997>] down_trylock+0x9/0x1c [H 87.2745749] c0 [<0xc023ebb3>] __down_trylock_console_sem.constprop.0+0x13/0x28 [H 87.10231208] c0 [<0xc023ebcf>] console_trylock+0x7/0x30 [H 87.15717749] c0 [<0xc023ebff>] console_trylock_spinning+0x7/0x78 [H 87.21985249] c0 [<0xc024038f>] vprintk_emit+0x6b/0x90 [H 87.27297749] c0 [<0xc02403c7>] vprintk_default+0x13/0x18 [H 87.32869624] c0 [<0xbf8cb173>] osal_printk+0x1f/0x34 [osaldrv] [H 87.39013916] c0 [<0xbf9941ad>] vnne_suspend+0x19/0x30 [vnne] [H 87.44949749] c0 [<0xc03983a7>] dpm_run_callback+0x17/0x30 [H 87.50613124] c0 [<0xc0398705>] __device_suspend+0x109/0x230 [H 87.56445583] c0 [<0xc0398d8d>] dpm_suspend+0x5f/0xea [H 87.61672416] c0 [<0xc0398eeb>] dpm_suspend_start+0x2f/0x38 [H 87.67417708] c0 [<0xc023e5cd>] suspend_devices_and_enter+0x49/0xe4

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