qcom 平台如何配置不同子系统重启模式 SSR (Subsystem Restart) restart level
一、SSR level 说明：
在配置和使用subsystem restart level时，不同级别的restart level有如下几种：
No SSR (Subsystem Restart)：
设置值：disabled或none
解释：该模式下，子系统不会自动重启，即使发生崩溃。
Related SSR：
设置值：related
解释：当子系统崩溃时，仅相关的子系统会自动重启，而不会影响到其他子系统。这是为了减少崩溃对整个系统的影响。
System SSR：
设置值：system
解释：当子系统崩溃时，整个系统会自动重启。该模式下，所有子系统都会被重新初始化，确保系统处于一个干净的状态。
Early SSR：
设置值：early
解释：在子系统崩溃检测到后会尽早进行重启操作，可能在检测到问题的早期阶段就执行重启操作。
配置和查看这些restart level的命令如下：
二、查看各子系统名称：
cat /sys/bus/msm_subsys/devices/subsys*/name
modem
adsp
wcnss
venus
三、查看subsystem restart level：
adb shell
cat /sys/bus/msm_subsys/devices/subsysX/restart_level
其中X表示子系统的编号，如0表示modem。
设置restart level：
echo related > /sys/bus/msm_subsys/devices/subsysX/restart_level
将related替换为所需的restart level值，如system、disabled等。
确认配置生效：
通过查看命令确认设置已生效：
cat /sys/bus/msm_subsys/devices/subsysX/restart_level
四、查看全部子系统restart_level：
cat /sys/bus/msm_subsys/devices/subsys*/restart_level
SYSTEM
SYSTEM
SYSTEM
SYSTEM
五、测试、验证、确认
diag命令手动触发modem crash： send_data 75 37 03 00
或者 echo 1 > /sys/kernel/restart_modem 手动触发modem重启(不是所有的qcom芯片平台都支持)
或者 echo c>/proc/sysrq-trigger -> 手动触发kernel panic
可以根据kernel log查看modem是否重启
cat /proc/kmsg
搜索关键log： subsys-restart: subsystem_powerup():[kworker/u9:4:508]: Powering up modem
六、设置restart level
单独子系统重启：
setprop persist.vendor.ssr.restart_level "modem wcnss" 空格分割
全部子系统重启：
setprop persist.vendor.ssr.restart_level ALL_ENABLE
mk文件中配置全部子系统重启：
SSR_SWITCH_LEVEL := ALL_ENABLE
SYSTEM_PROPERTY_OVERRIDES += persist.vendor.ssr.restart_level = $(SSR_SWITCH_LEVEL)
七、相关代码
android/vendor/qcom/proprietary/ss-restart/ssr_setup/ssr_setup.c
#define SSR_BUS_ROOT "/sys/bus/msm_subsys/devices"
#define SSR_SETUP_PROP "persist.vendor.ssr.restart_level"
#define MAX_NUM_SUBSYS 16
#define SUBSYS_NAME_LEN 30
int setup_ssr(int num_subsys){
...
snprintf(ssr_toggle_path,
sizeof(ssr_toggle_path),
"%s/%s/restart_level",
SSR_BUS_ROOT,
de->d_name);
fd = open(ssr_toggle_path, O_WRONLY);
if (fd < 0) {
ALOGE("Failed to open %s : %s, continuing",
ssr_toggle_path,
strerror(errno));
continue;
}
if (enable_ssr) {
ALOGI("Enabling SSR for %s", de->d_name);
if (write(fd, "related",7) < 0) {
ALOGE("Failed to write to ssr node: %s",
strerror(errno));
goto error;
}
} else {
ALOGI("Disabling ssr for %s", de->d_name);
if (write(fd, "system",6) < 0) {
ALOGE("Failed to write to ssr node: %s",
strerror(errno));
goto error;
}
}
...
}
rc
on property:persist.vendor.ssr.restart_level=*
start vendor.ssr_setup
on property:persist.vendor.ssr.enable_ramdumps=1
write /sys/module/subsystem_restart/parameters/enable_ramdumps 1
mkdir /data/vendor/ramdump_ssr 770 system system
start vendor.ss_ramdump
参考文档：
80-P8754-71_REV_J_Minidump_Software_User_Guide.pdf
Subsystem Restart User Guide (80-N5609-2)
MSM8x10 Android Subsystem Restart Overview (80-NC839-21)
MSM8974 Android Subsystem Restart (80-NA157-31)
content：
Kernel configuration for Linux minidump enhancement
In the chipsets such as SM8350/SM4350, which is compatible with GKI1.0, enhancement has
been made on the Linux side. To enable it, use the following configuration for specific
enhancement.
CONFIG_QCOM_MINIDUMP_FTRACE=y
CONFIG_QCOM_MINIDUMP_PANIC_DUMP=y
CONFIG_QCOM_IRQ_STAT=y
CONFIG_QCOM_INITIAL_LOGBUF=y
CONFIG_QCOM_DYN_MINIDUMP_STACK=y
CONFIG_QCOM_MINIDUMP_PANIC_CPU_CONTEXT=y
Simulate modem SSR minidump：
adb wait-for-device root
adb wait-for-device shell
setenforce permissive
setprop persist.vendor.ssr.restart_level ALL_ENABLE
setprop persist.vendor.ssr.enable_ramdumps 1
echo mini > /sys/kernel/dload/dload_mode
/vendor/bin/subsystem_ramdump &
/vendor/bin/testapp_diag_senddata 75 37 03 00 00
pull modem ramdump_md_modem_xxxx.elf from /data/vendor/ramdump
Use the following steps for SM8450 and later chipsets:
- Execute the following commands to enable modem SSR and coredump:
adb shell "cat /sys/class/remoteproc/remoteprocX/name"
adb shell "cat /sys/class/remoteproc/remoteprocX/state"
adb shell "cat /sys/class/remoteproc/remoteprocX/recovery"
adb shell "echo enabled > /sys/class/remoteproc/remoteprocX/recovery"
adb shell "echo enabled > /sys/class/remoteproc/remoteprocX/coredump"
- Run the following commands to enable mini RAM dump collection:
adb shell "echo mini > /sys/kernel/dload/dload_mode'
adb shell "echo 1 >
/sys/module/qcom_ramdump/parameters/enable_dump_collection"
adb shell "./vendor/bin/subsystem_ramdump &"
- Trigger modem SSR command in qxdm (send_data 75 37 03 00 00), then check if mini dump
is generated at /data/vendor/ramdump partitio