54 lines
2.7 KiB
Markdown
54 lines
2.7 KiB
Markdown
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- 文件夹
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- kernel/power/
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- main.c 模块入口 core_initcall
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- suspend.c 睡眠 to RAM
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- hibernate.c 休眠 to DISK
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- poweroff.c 关机
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- 数据结构
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- syspend的几种模式
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- `#define PM_SUSPEND_ON ((__force suspend_state_t) 0)`
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- `#define PM_SUSPEND_TO_IDLE ((__force suspend_state_t) 1)` // s2-idle sleep
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- `#define PM_SUSPEND_STANDBY ((__force suspend_state_t) 2)` // standby modern?
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- `#define PM_SUSPEND_MEM ((__force suspend_state_t) 3)` // s3 sleep
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- 函数
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- pm_suspend S2 S3(deep sleep) CONFIG_SUSPEND_SKIP_SYNC
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- **enter_state** // s2idle shallow deep
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- **ksys_sync_helper** // 选择是否sync CONFIG_SUSPEND_SKIP_SYNC
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- **suspend_prepare** // 主要就是冻结软件进程
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- suspend_freeze_processes
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- freeze_processes // 冻结用户态进程
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- freeze_kernel_threads // 冻结内核任务
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- **suspend_devices_and_enter** // core function
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- platform_suspend_begin
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- suspend_console // 挂起console，从此时开始console无法再输出
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- **suspend_enter** // power/suspend.c 进入syspend模式
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- s2 和 s3的模式在这个函数中很不一样
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- S2
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- s2idle_loop // s2本质上是一个循环
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- S3 standby
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- suspend_disable_secondary_cpus
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- **arch_suspend_disable_irqs** -> local_irq_disable 屏蔽本核I位， 但是FIQ依然可以响应
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- syscore_suspend drivers/base/syscore.c
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- **psci_system_suspend_enter** // arm64用的是psci进行电源管理
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- cpu_suspend // arm64
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- cpu_suspend_enter // arch/arm64/kernel/sleep.s
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- psci_system_suspend ？ ==> bl3
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- suspend_finish
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[H 86.979381374] cs: c0 pc[c023c69a] lr[c023c689] sp[c0e5bdf0]
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[H 86.985310124] c0 pc: [<0xc023c69a>] arch_spin_lock+0x1a/0x32
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[H 86.991243291] c0 [<0xc047cd4b>] _raw_spin_lock_irqsave+0xd/0x10
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[H 86.997429541] c0 [<0xc023b997>] down_trylock+0x9/0x1c
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[H 87.2745749] c0 [<0xc023ebb3>] __down_trylock_console_sem.constprop.0+0x13/0x28
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[H 87.10231208] c0 [<0xc023ebcf>] console_trylock+0x7/0x30
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[H 87.15717749] c0 [<0xc023ebff>] console_trylock_spinning+0x7/0x78
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[H 87.21985249] c0 [<0xc024038f>] vprintk_emit+0x6b/0x90
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[H 87.27297749] c0 [<0xc02403c7>] vprintk_default+0x13/0x18
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[H 87.32869624] c0 [<0xbf8cb173>] osal_printk+0x1f/0x34 [osaldrv]
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[H 87.39013916] c0 [<0xbf9941ad>] vnne_suspend+0x19/0x30 [vnne]
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[H 87.44949749] c0 [<0xc03983a7>] dpm_run_callback+0x17/0x30
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[H 87.50613124] c0 [<0xc0398705>] __device_suspend+0x109/0x230
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[H 87.56445583] c0 [<0xc0398d8d>] dpm_suspend+0x5f/0xea
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[H 87.61672416] c0 [<0xc0398eeb>] dpm_suspend_start+0x2f/0x38
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[H 87.67417708] c0 [<0xc023e5cd>] suspend_devices_and_enter+0x49/0xe4
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