msm8994 热插拔sim卡导致modem重新启动的流程

Modem侧重新激活协议栈之后会调用mcfg_utils_reset_modem

mcfg_utils_reset_modem->

result = efs_sync ("/");

sys_m_request_peripheral_restart_ssreq(&mcfg_utils_sys_m_ssreq_reset_cb);

ssreq_process_request(SSREQ_PERIPHERAL_RESTART, ind_cb_fn);

case SSREQ_PERIPHERAL_RESTART:

ssreq_restart_peripheral();

ssreq_p_restart_req.ss_client_id = SSREQ_QMI_CLIENT_INSTANCE_MPSS_V01;

qmi_client_send_msg_sync(ssreq_client_handle, SSREQ_PERIPHERAL_RESTART,(void*)&ssreq_p_restart_req,sizeof(ssreq_p_restart_req),

(void*)&ssreq_p_restart_resp,sizeof(ssreq_p_restart_resp),0 );//QMI_SSREQ_PERIPHERAL_RESTART_REQ_V01 0x0022**//1** 发送复位请求给****AP

AP 侧收到QMI_SSREQ_PERIPHERAL_RESTART_REQ_V01的处理流程

in /msm8994_c3012.2/vendor/qcom/proprietary/peripheral-manager/pm-server/PeripheralManagerServer.cpp

qmi_csi_cb_error qmiServerProcessRequest(void *__qmiClient,qmi_req_handle reqHandle,unsigned int msgId, void *reqStruct,unsigned int reqStructLen,void *__pmService)

case QMI_SSREQ_PERIPHERAL_RESTART_REQ_V01:

qmiServerPeripheralRestart(qmiClient, reqHandle, msgId,reqStruct, pmService);

pmService->restartPeripheral(identifier, qmiClient);

peripheral = findBySubSystem(identifier);

started = peripheral->setRestartRequested((void *)qmiClient);

notifyClients(EVENT_PERIPH_GOING_OFFLINE);

client->eventSend(event);

mClientCb->notifyCallback((int32_t)event);

//pm_proxy_event_notifier ssctl_shutdown_cb app_event_notifier qmi_ril_pm_event_notifier

//all thest four call back function will call below function

pm_client_event_acknowledge(client_cookie, event);

client->ops->acknowledge(client->id, (int64_t)event);

//it should call PeripheralManagerServer::acknowledge,but I don’t know how!!

peripheral->notifyClientAck(client, (enum pm_event)event);

response.resp.result = QMI_RESULT_SUCCESS_V01;

response.resp.error = QMI_ERR_NONE_V01;

qmi_csi_send_resp(reqHandle, msgId, &response, sizeof(response));//2 给modem侧回复复位请求的****resp

peripheral->notifyClientAck(client, (enum pm_event)event);

case EVENT_PERIPH_GOING_OFFLINE:

sendRestartIndication();

client = (qmi_client_handle)mRestartRequestor;

msgId = QMI_SSREQ_PERIPHERAL_RESTART_IND_V01;

ind.status = SSREQ_QMI_REQUEST_SERVICED_V01;

ret = qmi_csi_send_ind(client, msgId, &ind, sizeof(ind));//3发送QMI_SSREQ_PERIPHERAL_RESTART_IND_V01给modem

if (mFileDesc > 0) {

if (!mSimulationMode)

ret = close(mFileDesc);//will call subsys_device_close to ask modem do graceful reset//5 进行****modem close 的流程

mFileDesc = -1;

mPowerOffCount++;

notifyClients(EVENT_PERIPH_IS_OFFLINE);//6 change state to is offline

case EVENT_PERIPH_IS_OFFLINE

if (isRestartRequested())

setRestartRequested(NULL);

notifyClients(EVENT_PERIPH_GOING_ONLINE);//7 change state to going online

case EVENT_PERIPH_GOING_ONLINE:

if (mFileDesc < 0)

if (!mSimulationMode)

mFileDesc = open(mDeviceFile, O_RDONLY);//8 will call subsys_device_open to reload and power on the modem

mFileDesc = 1;

if (mFileDesc > 0)

mPowerOnCount++;

if (mFileDesc > 0) {

notifyClients(EVENT_PERIPH_IS_ONLINE);

subsys_device_close

subsystem_put(subsys_dev);

subsys_stop(subsys);

subsys->desc->sysmon_shutdown_ret = sysmon_send_shutdown(subsys->desc);//5.1给modem发送QMI_SSCTL_SHUTDOWN_REQ_V02****，让modem自己做内部的****shutdown 准备，并等待****resp

notify_each_subsys_device(&subsys, 1, SUBSYS_BEFORE_SHUTDOWN, NULL);//通知其他子系统

subsys->desc->shutdown(subsys->desc, false);//5.2调用modem shutdown 函数给modem关机

subsys_set_state(subsys, SUBSYS_OFFLINE);

disable_all_irqs(subsys);

notify_each_subsys_device(&subsys, 1, SUBSYS_AFTER_SHUTDOWN, NULL);

sysmon_send_shutdown

req_desc.msg_id = QMI_SSCTL_SHUTDOWN_REQ_V02//同步发送给modem并等待应答表示modem已经graceful shutdown 完毕

4 Modem 收到 AP发送的QMI_SSREQ_PERIPHERAL_RESTART_IND_V01****后的处理

mcfg_utils_sys_m_ssreq_reset_cb

mcfg_utils_cmd_send(MCFG_UTILS_CMD_RESET);

utils_cmd_data = (mcfg_utils_cmd_data_s_type *) cmd->data;

utils_cmd_data->cmd_id = utils_cmd;

mcfg_task_cmd_send(cmd)

case MCFG_UTILS_CMD_RESET

timer_set(&mcfg_utils_reset_timer, MCFG_UTILS_RESET_TIMER_TIMEOUT,0, T_SEC);

timer 超时后会调用

mcfg_utils_cmd_reset_timer_cb 会重新调用

mcfg_utils_reset_modem(

#ifdef MCFG_MODEM_INITITIATED_GRACEFUL_RESET_SUPPORT_W_REASON

SSREQ_QMI_RES_MODEM_CONF_CHANGE

#endif

);

6 Modem 收到 AP发送的QMI_SSCTL_SHUTDOWN_REQ_V02****后的处理

ssctl_v02_ser_process_req

caseQMI_SSCTL_SHUTDOWN_REQ_V02:

qmi_csi_send_resp(req_handle, msg_id, response, sizeof(qmi_ssctl_shutdown_resp_msg_v02));//7 其实modem内部还没有准备完毕就发送response了
sys_m_shutdown(SYS_M_QMI);

sys_m_shutdown_internal();//modem 自己内部走重启流程，但是不用errfatal的方式通知AP

rcecb_signal_name(SYS_M_SHUTDOWN);//发送SYS_M_SHUTDOWN，会触发注册了这个消息的call back 函数。

req_count = rcevt_getcontexts_name(SYS_M_SHUTDOWN);//得到注册了SYS_M_SHUTDOWN的task的数目

orig_ack_count = rcevt_getcount_name(SYS_M_SHUTDOWN_ACK);//得到注册了SYS_M_SHUTDOWN_ACK的task的数目

rcevt_signal_name(SYS_M_SHUTDOWN);//发送SYS_M_SHUTDOWN，会触发注册了这个signal的task运行

rcevt_wait_count_name(SYS_M_SHUTDOWN_ACK, req_count + orig_ack_count);//等待应答。

err = qmi_csi_send_ind((qmi_sys_m_client.qmi_client_handle),QMI_SSCTL_SHUTDOWN_READY_IND_V02,&ind,sizeof(qmi_ssctl_shutdown_ind_msg_v02));

HAL_dogDisable();

qurt_exception_raise_fatal();//这个看不到代码，不知道是做什么用的，不过按理说不应走raise什么fatal

while(1){}//死循环，等待被复位