【Camera KMD ISP SubSystem笔记】CAM SYNC与DRQ②

DRQ的作用:

DRQ负责调度管理pipeline里的node处理逻辑(通过node之间的dependency依赖机制)

利用多线程并行处理Pipeline中并行的node,加快处理速度


DRQ运转流程:

DRQ先告诉node fill dependency, 此时seq id 为0(metadata/property,buffer,chifence)

metadatapool writeDataList - DRQ - thread pool - node 此时seq id 为1

buffer signal - camsync - DRQ - node

chifence signal - camsync - DRQ - node

线程池和DRQ实例:

session, pipeline, node, drq, metapool等用的是chicontext里的同一个线程池

ChiContext::Initialize()

{

ThreadManager::Create(&m_pThreadManager, "SoloThreadManager", numThreads);

//线程池handler会传递给session, pipeline, node, drq, metapool等进行共同使用

}

一个session里面所有的pipeline共用一个DRQ

Session::Initialize()

{

m_pDeferredRequestQueue = DeferredRequestQueue::Create(&pDeferredCreateData);

}

重要结构体介绍:

DeferredRequestQueue:

class DeferredRequestQueue : public IPropertyPoolObserver(观察者模式)

{

Hashmap* m_pDependencyMap; ///< Hashmap to store pending dependencies(所有的依赖)

ThreadManager* m_pThreadManager; ///< 指向一个线程池

Session* m_pSession; ///< pointer to Session to which this DRQ belongs

JobHandle m_hDeferredWorker; ///< 通过这个worker handle执行异步操作

LightweightDoublyLinkedList m_deferredNodes; ///< List of deferred nodes

LightweightDoublyLinkedList m_readyNodes; ///< List of ready nodes

MetadataPool* m_pMainPools[MaxPipelinesPerSession]; ///< 保存了每个pipeline的result metadata pool

}

DependencyUnit:(每个node需要填充的Dependency)

每个Node需要填写自己处理一个request需要的dependency(chifence, fence, metadata/property),只有所有的dependency都满足后,DRQ才会调度线程池去安排node处理request

struct DependencyUnit

{

PropertyDependency propertyDependency(metadata);

bufferDependency;// input buffer fence

chiFenceDependency;// non buffer fence(NCS)

}

Dependency:(node填充完Dependency后会送到DRQ,这个是转换为属于DRQ的Dependency)

DependencyKey:(Hashmap的key)

struct DependencyKey

{

UINT64 requestId; ///< Request ID

UINT64 pipelineId; ///< pipeline id for the data

UINT32 dataId; ///< Property/Metadata/Data identifier

VOID* pFence; ///< Fence pointer

VOID* pChiFence; ///< Chi Fence pointer

};

mapKey-property类型:

DependencyKey mapKey = {request, pDependency->pipelineIds[i], pDependency->properties[i], NULL, NULL};

mapKey-buffer fence(csl)类型:

DependencyKey mapKey = {0, 0, PropertyIDInvalid, pDependency->phFences[i], NULL};

mapKey-chi fence类型:

DependencyKey mapKey = {0, 0, PropertyIDInvalid, NULL, pDependency->pChiFences[i]};

HashMap结构图:

m_deferredNodes 与 m_readyNodes 结构:

所有的Dependency会先加入到m_deferredNodes 链表中,当所有的Dependency满足时会添加到m_readyNodes链表中

m_readyNodes会丢进线程池中去处理(即调用当前已经满足依赖的node processrequest)

DRQ相关知识点可以结合以下博客,共同分析:

【Qcom Camera】DumpDebugInfo分析-CSDN博客

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