// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// Overview:

// Test and benchmark kernel-side utility operations  

// API Information:

// RBusLogicalChannel			

// Details:

// - Create a list of benchmark modules and start running them one by one;

// each module contains a set of measurement units, each unit runs for a fixed

// amount of time in a series of iterations; the results, minimum, maximum and

// average times are displayed on the screen;

// The tests use a high resolution timer implemented kernel side in a device

// driver.

// - The test contains the following benchmark modules:

// - Real-time latency module measures:

// - interrupt latency by calculating the time taken from when an

// interrupt is generated until the ISR starts

// - kernel thread latency by calculating the time taken from an ISR

// scheduling a DFC to signal the kernel thread until the kernel thread

// starts running

// - kernel thread latency as above while a CPU intensive low priority

// user thread runs at the same time

// - user thread latency by calculating the time taken from an ISR 

// scheduling a DFC to signal the user thread until the user thread

// starts running

// - user thread latency as above while a CPU intensive low priority

// user thread runs at the same time

// - NTimer period jitter by calculating the actual period as the delta

// between two consecutive NTimer callbacks that store the current time;

// the jitter is the difference between the actual period and a theoretical

// period.

// - timer overhead by calculating the delta of time between two consecutive

// timestamps requested from the high precision timer implemented in the

// device driver; the calls are made from kernel side code

// - Overhead module measures:

// - timer overhead by calculating the delta of time between two consecutive

// timestamps requested from the high precision timer implemented in the

// device driver; the calls are made from user side code

// - Synchronization module measures: 

// - mutex passing, local mutex contention, remote mutex contention, 

// local semaphore latency, remote semaphore latency, 

// local thread semaphore latency, remote thread semaphore latency.

// - Client-server framework module measures:

// - For local high priority, local low priority, remote high priority 

// and remote low priority: connection request latency, connection

// reply latency, request latency, request response time, reply latency.

// - Threads modules measures:

// - Thread creation latency, thread creation suicide, thread suicide,

// thread killing, setting per thread data, getting per thread data.

// - Properties module measures:

// - Local int notification latency, remote int notification latency, 

// local byte(1) notification latency, remote byte(1) notification latency, 

// local byte(8) notification latency, remote byte(8) notification latency, 

// local byte(512) notification latency, remote byte(512) notification latency, 

// int set overhead, byte(1) set overhead, byte(8) set overhead, byte(512) set 

// overhead, int get overhead, byte(1) get overhead, byte(8) get overhead, 

// byte(512) get overhead. 

// Platforms/Drives/Compatibility:

// All.

// Assumptions/Requirement/Pre-requisites:

// Failures and causes:

// Base Port information:

// 

//

#include "bm_suite.h"

#include <e32svr.h>

#include <u32hal.h>

//

// The default value of the time allocated for one benchmark program.  

//

static TInt KBMSecondsPerProgram = 30;

//

// The initial number of iterations to estimate the acctual number of iteration. 

//

static TInt KBMCalibrationIter = 64;

//

// Global handle to high-resolution timer. 

//

RBMTimer bmTimer;

//

// The head of the benchmark programs' list

//

BMProgram* bmSuite; 

//

// Global handle to the kernel side benchmark utilty API 

//

static RBMDriver bmDriver;

TBMResult::TBMResult(const TDesC& aName) : iName(aName) 

	{

	Reset();

	}

void TBMResult::Reset()

	{

	::bmTimer.Period(&iMinTicks);

	iMaxTicks = 0;

	iCumulatedTicks = 0;

	iCumulatedIterations = 0;

	iIterations = 0;

	iMin = 0;

	iMax = 0;

	iAverage = 0;

	}

void TBMResult::Reset(const TDesC& aName)

	{

	Reset();

	iName.Set(aName);

	}

void TBMResult::Cumulate(TBMTicks aTicks)

{

	if (aTicks < iMinTicks) iMinTicks = aTicks;

	if (iMaxTicks < aTicks) iMaxTicks = aTicks;

	iCumulatedTicks += aTicks;

	if (iCumulatedIterations < KHeadSize)

		{

		iHeadTicks[iCumulatedIterations] = aTicks;

		}

		// use the array as a circular buufer to store last KTailSize results

		// (would not really know which one was actually the last)

	iTailTicks[iCumulatedIterations % KTailSize] = aTicks;

	++iCumulatedIterations;

}

void TBMResult::Cumulate(TBMTicks aTicks, TBMUInt64 aIter)

{

	iCumulatedIterations += aIter;

	iCumulatedTicks += aTicks;

}

void TBMResult::Update()

{

	if (iCumulatedIterations == 0) return;

	iIterations = iCumulatedIterations;

	::bmTimer.TicksToNs(&iMinTicks, &iMin);

	::bmTimer.TicksToNs(&iMaxTicks, &iMax);

	TBMTicks averageTicks = iCumulatedTicks/TBMUInt64(iCumulatedIterations);

	::bmTimer.TicksToNs(&averageTicks, &iAverage);

	TInt i;

	for (i = 0; i < KHeadSize; ++i) 

		{

		::bmTimer.TicksToNs(&iHeadTicks[i], &iHead[i]);

		}

	for (i = 0; i < KTailSize; ++i) 

		{

		::bmTimer.TicksToNs(&iTailTicks[i], &iTail[i]);

		}

	}

inline TBMNs TTimeIntervalMicroSecondsToTBMNs(TTimeIntervalMicroSeconds us)

	{

	return BMUsToNs(*(TBMUInt64*)&us);

	}

TBMNs TBMTimeInterval::iStampPeriodNs;

TBMTicks TBMTimeInterval::iStampPeriod;

void TBMTimeInterval::Init()

	{

	::bmTimer.Period(&iStampPeriod); 

	::bmTimer.TicksToNs(&iStampPeriod, &iStampPeriodNs);

}

void TBMTimeInterval::Begin()

	{

	//

	// Order is important: read first low-precision timer, then the high-precision one. 

	// Therefore, two high-precision timer reads will be accounted in the low-precision interval,

	// that's better than the opposite.

	//

	iTime.HomeTime();

	::bmTimer.Stamp(&iStamp);

	}

TBMNs TBMTimeInterval::EndNs()

	{

	//

	// Now, in the reverse order

	//

	TBMTicks stamp;

	::bmTimer.Stamp(&stamp);

	TTime time;	

	time.HomeTime();

	TBMNs ns = TTimeIntervalMicroSecondsToTBMNs(time.MicroSecondsFrom(iTime));

	//

	// If the interval fits in the high-precision timer period we can use it;

	// otherwise, use the low-precision timer.

	//

	if (ns < iStampPeriodNs)

		{

		stamp = TBMTicksDelta(iStamp, stamp);

		::bmTimer.TicksToNs(&stamp, &ns);

		}

	return ns;

	}

TBMTicks TBMTimeInterval::End()

	{

	//

	// The same as the previous one but returns ticks

	//

	TBMTicks stamp;

	::bmTimer.Stamp(&stamp);

	TTime time;	

	time.HomeTime();

	TBMNs ns = TTimeIntervalMicroSecondsToTBMNs(time.MicroSecondsFrom(iTime));

	if (ns < iStampPeriodNs)

		{

		stamp = TBMTicksDelta(iStamp, stamp);

		}

	else

		{

			// multiply first - privileging precision to improbable overflow.

		stamp = (ns * iStampPeriod) / iStampPeriodNs; 

		}

	return stamp;

	}

TInt BMProgram::SetAbsPriority(RThread aThread, TInt aNewPrio)

	{

	TInt aOldPrio=0;

	TInt r = ::bmDriver.SetAbsPriority(aThread, aNewPrio, &aOldPrio);

	BM_ERROR(r, r == KErrNone);

	return aOldPrio;

	}

const TInt TBMSpawnArgs::KMagic = 0xdeadbeef;

TBMSpawnArgs::TBMSpawnArgs(TThreadFunction aChildFunc, TInt aChildPrio, TBool aRemote, TInt aSize)

	{

	iMagic = KMagic;

	iParentId = RThread().Id();

		// get a thread handle meaningful in the context of any other thread. 

		// (RThread() doesn't work since contextual!)

	TInt r = iParent.Open(iParentId);

	BM_ERROR(r, r == KErrNone);

	iRemote = aRemote;

	iChildFunc = aChildFunc;

	iChildPrio = aChildPrio;

	iSize = aSize;

	}

TBMSpawnArgs::~TBMSpawnArgs()

	{

	iParent.Close();

	}

//

// An object of CLocalChild class represents a "child" thread created by its "parent" thread 

// in the parent's process through BmProgram::SpawnChild() interface.

//

// CLocalChild class is typically used (invoked) by the parent's thread. 

//

class CLocalChild : public CBase, public MBMChild

	{

private:

	BMProgram*		iProg;

public:

	RThread			iChild;

	TRequestStatus	iExitStatus;

	CLocalChild(BMProgram* aProg)

		{

		iProg = aProg;

		}

	virtual void WaitChildExit();

	virtual void Kill();

	};

void CLocalChild::Kill()

	{

	iChild.Kill(KErrCancel);

	}

void CLocalChild::WaitChildExit()

	{

	User::WaitForRequest(iExitStatus);

	CLOSE_AND_WAIT(iChild);

	//

	// Lower the parent thread priority and then restore the current one 

	// to make sure that the kernel-side thread destruction DFC had a chance to complete.

	//

	TInt prio = BMProgram::SetAbsPriority(RThread(), iProg->iOrigAbsPriority);

	BMProgram::SetAbsPriority(RThread(), prio);

	delete this;

	}

//

// Local (i.e. sharing the parent's process) child's entry point

//

TInt LocalChildEntry(void* ptr)

	{

	TBMSpawnArgs* args = (TBMSpawnArgs*) ptr;

	args->iChildOrigPriority = BMProgram::SetAbsPriority(RThread(), args->iChildPrio);

	return args->iChildFunc(args);

	}

MBMChild* BMProgram::SpawnLocalChild(TBMSpawnArgs* args)

	{

	CLocalChild* child = new CLocalChild(this);

	BM_ERROR(KErrNoMemory, child);

	TInt r = child->iChild.Create(KNullDesC, ::LocalChildEntry, 0x2000, NULL, args);

	BM_ERROR(r, r == KErrNone);

	child->iChild.Logon(child->iExitStatus);

	child->iChild.Resume();

	return child;

	}

//

// An object of CRemoteChild class represents a "child" thread created by its "parent" thread 

// as a separate process through BmProgram::SpawnChild() interface.

//

// CRemoteChild class is typically used (invoked) by the parent's thread. 

//

class CRemoteChild : public CBase, public MBMChild

	{

private:

	BMProgram*		iProg;

public:

	RProcess		iChild;

	TRequestStatus	iExitStatus;

	CRemoteChild(BMProgram* aProg)

		{

		iProg = aProg;

		}

	virtual void WaitChildExit();

	virtual void Kill();

	};

void CRemoteChild::Kill()

	{

	iChild.Kill(KErrCancel);

	}

void CRemoteChild::WaitChildExit()

	{

	User::WaitForRequest(iExitStatus);

	CLOSE_AND_WAIT(iChild);

	//

	// Lower the parent thread priority and then restore the current one 

	// to make sure that the kernel-side thread destruction DFC had a chance to complete.

	//

	TInt prio = BMProgram::SetAbsPriority(RThread(), iProg->iOrigAbsPriority);

	BMProgram::SetAbsPriority(RThread(), prio);

	delete this;

	}

//

// Remote (i.e. running in its own process) child's entry point.

// Note that the child's process entry point is still E32Main() process (see below)

//

TInt ChildMain(TBMSpawnArgs* args)

	{

	args->iChildOrigPriority = BMProgram::SetAbsPriority(RThread(), args->iChildPrio);

		// get a handle to the parent's thread in the child's context.

	TInt r = args->iParent.Open(args->iParentId);

	BM_ERROR(r, r == KErrNone);

	return args->iChildFunc(args);

	}

MBMChild* BMProgram::SpawnRemoteChild(TBMSpawnArgs* args)

	{

	CRemoteChild* child = new CRemoteChild(this);

	BM_ERROR(KErrNoMemory, child);

	//

	// Create the child process and pass args as a UNICODE command line.

	// (we suppose that the args size is multiple of sizeof(TUint16))

	//

	BM_ASSERT((args->iSize % sizeof(TUint16)) == 0);

	TInt r = child->iChild.Create(RProcess().FileName(), TPtrC((TUint16*) args, args->iSize/sizeof(TUint16)));

	BM_ERROR(r, (r == KErrNone) );

	child->iChild.Logon(child->iExitStatus);

	child->iChild.Resume();

	return child;

	}

MBMChild* BMProgram::SpawnChild(TBMSpawnArgs* args)

	{

	MBMChild* child;

	if (args->iRemote)

		{

		child = SpawnRemoteChild(args);

		}

	else

		{

		child = SpawnLocalChild(args);

		}

	return child;

	}

//

// The benchmark-suite entry point.

//

GLDEF_C TInt E32Main()

	{

	RTest test(_L("Benchmark Suite"));

	test.Title();

	AddProperty();

	AddThread();

	AddIpc();

	AddSync();

	AddOverhead();

	AddrtLatency();

	TInt r = User::LoadPhysicalDevice(KBMPddFileName);

	BM_ERROR(r, (r == KErrNone) || (r == KErrAlreadyExists));

	r = User::LoadLogicalDevice(KBMLddFileName);

	BM_ERROR(r, (r == KErrNone) || (r == KErrAlreadyExists));

	r = ::bmTimer.Open();

	BM_ERROR(r, (r == KErrNone));

	r = ::bmDriver.Open();

	BM_ERROR(r, (r == KErrNone));

	TBMTimeInterval::Init();

	TInt seconds = KBMSecondsPerProgram;

	TInt len = User::CommandLineLength();

	if (len)

		{

		//

		// Copy the command line in a buffer

		//

		TInt size = len * sizeof(TUint16);

		HBufC8* hb = HBufC8::NewMax(size);

		BM_ERROR(KErrNoMemory, hb);

		TPtr cmd((TUint16*) hb->Ptr(), len);

		User::CommandLine(cmd);

		//

		// Check for the TBMSpawnArgs magic number.

		//

		TBMSpawnArgs* args = (TBMSpawnArgs*) hb->Ptr();	

		if (args->iMagic == TBMSpawnArgs::KMagic)

			{

			//

			// This is a child process -  call it's entry point

			//

			return ::ChildMain(args);

			}

		else

			{

			//

			// A real command line - the time (in seconds) for each benchmark program.

			//

			TLex l(cmd);

			r = l.Val(seconds);

			if (r != KErrNone)

				{

				test.Printf(_L("Usage: bm_suite <seconds>\n"));

				BM_ERROR(r, 0);

				}

			}

		delete hb;

		}

	{

	TBMTicks ticks = 1;

	TBMNs ns;

	::bmTimer.TicksToNs(&ticks, &ns);

	test.Printf(_L("High resolution timer tick %dns\n"), TInt(ns));

	test.Printf(_L("High resolution timer period %dms\n"), BMNsToMs(TBMTimeInterval::iStampPeriodNs));

	}

	test.Start(_L("Performance Benchmark Suite"));

	BMProgram* prog = ::bmSuite;

	while (prog) {

		//

		// For each program from the benchmark-suite's list

		//

		//

		// Remember the number of open handles. Just for a sanity check ....

		//

		TInt start_thc, start_phc;

		RThread().HandleCount(start_phc, start_thc);

		test.Printf(_L("%S\n"), &prog->Name());

		//

		// A benchmark-suite's thread can run at any of three possible absolute priorities:

		//		KBMPriorityLow, KBMPriorityMid and KBMPriorityHigh.

		// The main thread starts individual benchmark programs at KBMPriorityMid

		//

		prog->iOrigAbsPriority = BMProgram::SetAbsPriority(RThread(), KBMPriorityMid);

		//

		// First of all figure out how many iteration would be required to run this program

		// for the given number of seconds.

		//

		TInt count;

		TBMNs ns = 0;

		TBMUInt64 iter = KBMCalibrationIter;

		for (;;) 

			{

			TBMTimeInterval ti;

			ti.Begin();

			prog->Run(iter, &count);

			ns = ti.EndNs();

				// run at least 100ms (otherwise, could be too much impricise ...)

			if (ns > BMMsToNs(100)) break;