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/* ----------------------------------------------------------------------------
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* Copyright (c) Huawei Technologies Co., Ltd. 2018-2019. All rights reserved.
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* Description: Muti-core processing
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* Author: Huawei LiteOS Team
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* Create: 2018-07-10
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* --------------------------------------------------------------------------- */
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/*针对多处理器（SMP）系统的操作系统内核部分的实现
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主要包括了多处理器调度、任务管理和中断处理等功能*/
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#include "los_mp_pri.h"
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#include "los_task_pri.h"
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#include "los_percpu_pri.h"
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#include "los_sched_pri.h"
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#include "los_swtmr.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif
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#endif /* __cplusplus */
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#ifdef LOSCFG_KERNEL_SMP
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#ifdef LOSCFG_KERNEL_SMP_CALL
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LITE_OS_SEC_BSS SPIN_LOCK_INIT(g_mpCallSpin);
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#define MP_CALL_LOCK(state) LOS_SpinLockSave(&g_mpCallSpin, &(state))
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#define MP_CALL_UNLOCK(state) LOS_SpinUnlockRestore(&g_mpCallSpin, (state))
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#endif
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//LOS_MpSchedule：多处理器调度函数，用于向指定的处理器发送调度中断
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VOID LOS_MpSchedule(UINT32 target)
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{
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UINT32 ret;
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UINT32 cpuid = ArchCurrCpuid();
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target &= ~(1U << cpuid);
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ret = HalIrqSendIpi(target, LOS_MP_IPI_SCHEDULE);
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if (ret != LOS_OK) {
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return;
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}
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return;
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}
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//OsMpWakeHandler：多处理器唤醒处理函数，目前为空实现，无特定操作
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VOID OsMpWakeHandler(VOID)
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{
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/* generic wakeup ipi, do nothing */
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}
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//OsMpScheduleHandler：多处理器调度处理函数，设置调度标志以触发调度器在中断结束时执行调度
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VOID OsMpScheduleHandler(VOID)
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{
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/*
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* set schedule flag to differ from wake function,
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* so that the scheduler can be triggered at the end of irq.
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*/
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OsPercpuGet()->schedFlag = INT_PEND_RESCH;
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}
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//OsMpHaltHandler：多处理器停机处理函数，将当前处理器标记为已停机状态，并进入死循环
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VOID OsMpHaltHandler(VOID)
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{
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(VOID)LOS_IntLock();
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OsPercpuGet()->excFlag = CPU_HALT;
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while (1) {}
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}
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//OsMpCollectTasks：多处理器任务回收函数，用于递归检查所有可用任务，并删除标记为需要销毁的任务
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VOID OsMpCollectTasks(VOID)
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{
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LosTaskCB *taskCB = NULL;
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UINT32 taskId = 0;
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UINT32 ret;
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/* recursive checking all the available task */
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for (; taskId <= g_taskMaxNum; taskId++) {
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taskCB = &g_taskCBArray[taskId];
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if ((taskCB->taskStatus & OS_TASK_STATUS_UNUSED) ||
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(taskCB->taskStatus & OS_TASK_STATUS_RUNNING)) {
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continue;
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}
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/*
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* though task status is not atomic, this check may success but not accomplish
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* the deletion; this deletion will be handled until the next run.
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*/
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if (taskCB->signal & SIGNAL_KILL) {
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ret = LOS_TaskDelete(taskId);
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if (ret != LOS_OK) {
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PRINT_WARN("GC collect task failed err:0x%x\n", ret);
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}
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}
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}
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}
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#ifdef LOSCFG_KERNEL_SMP_CALL
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//OsMpFuncCall：多处理器函数调用函数，用于向指定的处理器发送函数调用请求
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VOID OsMpFuncCall(UINT32 target, SMP_FUNC_CALL func, VOID *args)
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{
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UINT32 index;
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UINT32 intSave;
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UINT32 ret;
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if (func == NULL) {
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return;
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}
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if (!(target & OS_MP_CPU_ALL)) {
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return;
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}
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for (index = 0; index < LOSCFG_KERNEL_CORE_NUM; index++) {
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if (CPUID_TO_AFFI_MASK(index) & target) {
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MpCallFunc *mpCallFunc = (MpCallFunc *)LOS_MemAlloc(m_aucSysMem0, sizeof(MpCallFunc));
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if (mpCallFunc == NULL) {
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PRINT_ERR("smp func call malloc failed\n");
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return;
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}
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mpCallFunc->func = func;
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mpCallFunc->args = args;
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MP_CALL_LOCK(intSave);
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LOS_ListAdd(&g_percpu[index].funcLink, &(mpCallFunc->node));
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MP_CALL_UNLOCK(intSave);
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}
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}
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ret = HalIrqSendIpi(target, LOS_MP_IPI_FUNC_CALL);
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if (ret != LOS_OK) {
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return;
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}
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return;
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}
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//OsMpFuncCallHandler：多处理器函数调用处理函数，从本处理器的函数调用队列中取出并执行函数调用请求
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VOID OsMpFuncCallHandler(VOID)
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{
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UINT32 intSave;
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UINT32 cpuid = ArchCurrCpuid();
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LOS_DL_LIST *list = NULL;
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MpCallFunc* mpCallFunc = NULL;
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MP_CALL_LOCK(intSave);
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while (!LOS_ListEmpty(&g_percpu[cpuid].funcLink)) {
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list = LOS_DL_LIST_FIRST(&g_percpu[cpuid].funcLink);
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LOS_ListDelete(list);
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MP_CALL_UNLOCK(intSave);
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mpCallFunc = LOS_DL_LIST_ENTRY(list, MpCallFunc, node);
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mpCallFunc->func(mpCallFunc->args);
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(VOID)LOS_MemFree(m_aucSysMem0, mpCallFunc);
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MP_CALL_LOCK(intSave);
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}
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MP_CALL_UNLOCK(intSave);
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}
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//OsMpFuncCallInit：多处理器函数调用初始化函数，用于初始化每个核心的函数调用队列
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VOID OsMpFuncCallInit(VOID)
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{
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UINT32 index;
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/* init funclink for each core */
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for (index = 0; index < LOSCFG_KERNEL_CORE_NUM; index++) {
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LOS_ListInit(&g_percpu[index].funcLink);
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}
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}
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#endif /* LOSCFG_KERNEL_SMP_CALL */
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//OsMpInit：多处理器初始化函数，包括创建周期性软件定时器和初始化函数调用队列等
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UINT32 OsMpInit(VOID)
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{
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UINT16 swtmrId;
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UINT32 ret;
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ret = LOS_SwtmrCreate(OS_MP_GC_PERIOD, LOS_SWTMR_MODE_PERIOD,
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(SWTMR_PROC_FUNC)OsMpCollectTasks, &swtmrId, 0);
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if (ret != LOS_OK) {
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PRINT_ERR("Swtmr Create failed err:0x%x\n", ret);
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return ret;
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}
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ret = LOS_SwtmrStart(swtmrId);
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if (ret != LOS_OK) {
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PRINT_ERR("Swtmr Start failed err:0x%x\n", ret);
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return ret;
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}
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#ifdef LOSCFG_KERNEL_SMP_CALL
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OsMpFuncCallInit();
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#endif
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return LOS_OK;
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}
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#endif
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif
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#endif /* __cplusplus */
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