author | hgs |
Thu, 10 Jun 2010 11:48:01 +0100 | |
changeset 148 | 31ea0f8e3c99 |
parent 132 | e4a7b1cbe40c |
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// Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL " http://www.eclipse.org/legal/epl-v10.html ". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// eka/drivers/smppower/sample_idlehandler/smpidlehandler.h |
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// Example of a generic idle handler layer |
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#ifndef __SMPIDLEHANDLER_H__ |
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#define __SMPIDLEHANDLER_H__ |
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#include <smppower/idlehelper.h> |
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#ifdef __SMP__ |
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//Helper class provides a generic idle handler that can derived from. However own idle handler can be used if the version |
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//provided here is not appropriate |
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class DSMPIdleHandler |
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{ |
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public: |
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// points at which a cpu might exit the idle handler |
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enum TIdleExit |
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{ |
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EExitOtherCPUsNotIdle, |
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EExitBeforeLPM, |
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EExitAfterLPM |
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}; |
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DSMPIdleHandler(); |
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virtual ~DSMPIdleHandler(); |
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/* |
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called to init and bind the idle handler. After this call idle will be directed to idle handler |
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@pre thread context, no locks no fast mutexes, interrupt on |
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*/ |
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void Initialise(TUint32 aGlobalIntDistAddress, TUint32 aBaseIntIfAddress); |
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/** |
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Must be called when cores are enaged or retired |
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@pre calling code must be outside idle handler, or in DoEnterIdle call |
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*/ |
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void ResetSyncPoints(); |
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protected: |
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/** |
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Called by idle handler inmediatelly after idle entry. Can be used for things |
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such as checking if a core is going to be retired and retiring |
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@param aCpuMask mask of current cpu |
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@param aStage passed from kernel indicated things such core retiring |
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or postamble |
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@param aU points to some per-CPU uncached memory used for handshaking in |
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during power up/power down of a core for support of core retiring. This |
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memory is provided by baseport to the kernel via the VIB |
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@return EFalse if the idle handler needs to be exited, ETrue to progress |
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further into idle |
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@see TIdleSupport::MarkCoreRetired |
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*/ |
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virtual TBool DoEnterIdle(TInt aCpuMask, TInt aStage, volatile TAny* aU); |
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/** |
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Called by idle handler all cpus to enter idle once all have entered idle but |
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before NTimeQ::IdleTime is called to check time to next timer expiry. Can be used |
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for things such as idle timer pre-idle processing. In such cases only the last CPU |
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should do the idle timer processing |
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@param aCpuMask mask of current cpu |
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@param aLastCPu indicates if this is last CPU. |
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*/ |
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virtual void CpusHaveEnteredIdle(TInt aCpuMask, TInt aLastCpu); |
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/** |
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This function gets called by the last CPU to go into idle once the system is locked |
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with all CPUs going idle. |
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In this function the baseport would fill an opaque integer which determines what low |
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power mode the platform can go to. |
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This mode is usually determined by the idle time available, entry and wake latencies |
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of low power modes, and states |
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additionally the function returns EFalse if a there is no point proceeding with idle |
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(say next tick is very close for example) |
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of other resources in the system |
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@param aIdleTime time until next timer is due as obtained from NTimerQ::IdleTime |
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@param aLowPowerMode low powe mode to go into, up to baseport on meaning of this |
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@return EFalse to force exit from idle handler if there is no point proceeding with idle |
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@see NTimerQ::IdleTIme |
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*/ |
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virtual TBool GetLowPowerMode(TInt aIdleTime, TInt &aLowPowerMode) = 0; |
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/** |
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This function actually enters the low power mode. It should do any state saving and perform |
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idle tick suppression. If rousing of other CPUs is required after wake then this function should |
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return true. |
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@param aMode the low power mode obtained from GetLowPowerMode |
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@param TInt aCpuMask indicates calling CPU |
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@param aLastCpu true if the calling CPU was the last to enter the idle thread |
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@return True if rousing of other cores is required after wakeup |
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*/ |
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virtual TBool EnterLowPowerMode(TInt aMode, TInt aCpuMask, TBool aLastCpu) = 0; |
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/** |
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Called after wakeup can be used for status restoring |
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a sync point is placed after the call to this function |
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This can be a good place to do idle tick restoration |
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@param TInt aCpuMask indicates calling CPU |
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@param aLastCPu indicates if this is last CPU. |
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@see EnterLowPowerMode |
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*/ |
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virtual void PostWakeup(TInt aCpuMask, TBool aLastCpu); |
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/** |
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Called at exit of idle handler not synchronised in any way |
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@param aExitPoint point at which you might exit the idle handler |
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@param TInt aCpuMask indicates calling CPU |
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@param aLastCPu indicates if this is last CPU. |
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*/ |
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virtual void DoExitIdle(TIdleExit aExitPoint, TInt aCpuMask, TBool aLastCpu); |
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private: |
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static void IdleHandler(TAny* aPtr, TInt aStage, volatile TAny* aU); |
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void DoIdle(TInt aStage, volatile TAny* aU); |
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static void StartAfterExtIntDfcFn(TAny*); |
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private: |
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const TUint32 iAllCpusMask; |
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TSyncPoint iIdleSync; |
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TBreakableSyncPoint iStage2; |
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volatile TUint32 iIdlingCpus; |
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volatile TUint32 iExitRequired; |
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TInt iLowPowerMode; |
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TDfc iStartAfterExtInitDfc; |
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TBool iInitialised; |
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}; |
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#endif // __SMP__ |
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#endif //__SMPIDLEHANDLER_H__ |