f16c0a4a90
Draining is currently done by traversing the SimObject graph and calling drain()/drainResume() on the SimObjects. This is not ideal when non-SimObjects (e.g., ports) need draining since this means that SimObjects owning those objects need to be aware of this. This changeset moves the responsibility for finding objects that need draining from SimObjects and the Python-side of the simulator to the DrainManager. The DrainManager now maintains a set of all objects that need draining. To reduce the overhead in classes owning non-SimObjects that need draining, objects inheriting from Drainable now automatically register with the DrainManager. If such an object is destroyed, it is automatically unregistered. This means that drain() and drainResume() should never be called directly on a Drainable object. While implementing the new functionality, the DrainManager has now been made thread safe. In practice, this means that it takes a lock whenever it manipulates the set of Drainable objects since SimObjects in different threads may create Drainable objects dynamically. Similarly, the drain counter is now an atomic_uint, which ensures that it is manipulated correctly when objects signal that they are done draining. A nice side effect of these changes is that it makes the drain state changes stricter, which the simulation scripts can exploit to avoid redundant drains.
167 lines
5.4 KiB
C++
167 lines
5.4 KiB
C++
/*
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* Copyright (c) 2012 ARM Limited
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* All rights reserved.
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2004-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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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
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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* Nathan Binkert
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*/
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#ifndef __DEV_IO_DEVICE_HH__
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#define __DEV_IO_DEVICE_HH__
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#include "mem/mem_object.hh"
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#include "mem/tport.hh"
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#include "params/BasicPioDevice.hh"
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#include "params/PioDevice.hh"
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class PioDevice;
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class System;
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/**
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* The PioPort class is a programmed i/o port that all devices that are
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* sensitive to an address range use. The port takes all the memory
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* access types and roles them into one read() and write() call that the device
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* must respond to. The device must also provide getAddrRanges() function
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* with which it returns the address ranges it is interested in.
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*/
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class PioPort : public SimpleTimingPort
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{
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protected:
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/** The device that this port serves. */
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PioDevice *device;
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virtual Tick recvAtomic(PacketPtr pkt);
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virtual AddrRangeList getAddrRanges() const;
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public:
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PioPort(PioDevice *dev);
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};
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/**
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* This device is the base class which all devices senstive to an address range
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* inherit from. There are three pure virtual functions which all devices must
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* implement getAddrRanges(), read(), and write(). The magic do choose which
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* mode we are in, etc is handled by the PioPort so the device doesn't have to
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* bother.
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*/
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class PioDevice : public MemObject
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{
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protected:
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System *sys;
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/** The pioPort that handles the requests for us and provides us requests
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* that it sees. */
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PioPort pioPort;
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/**
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* Every PIO device is obliged to provide an implementation that
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* returns the address ranges the device responds to.
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*
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* @return a list of non-overlapping address ranges
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*/
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virtual AddrRangeList getAddrRanges() const = 0;
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/** Pure virtual function that the device must implement. Called
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* when a read command is recieved by the port.
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* @param pkt Packet describing this request
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* @return number of ticks it took to complete
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*/
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virtual Tick read(PacketPtr pkt) = 0;
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/** Pure virtual function that the device must implement. Called when a
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* write command is recieved by the port.
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* @param pkt Packet describing this request
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* @return number of ticks it took to complete
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*/
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virtual Tick write(PacketPtr pkt) = 0;
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public:
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typedef PioDeviceParams Params;
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PioDevice(const Params *p);
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virtual ~PioDevice();
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const Params *
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params() const
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{
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return dynamic_cast<const Params *>(_params);
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}
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virtual void init();
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virtual BaseSlavePort &getSlavePort(const std::string &if_name,
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PortID idx = InvalidPortID);
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friend class PioPort;
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};
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class BasicPioDevice : public PioDevice
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{
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protected:
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/** Address that the device listens to. */
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Addr pioAddr;
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/** Size that the device's address range. */
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Addr pioSize;
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/** Delay that the device experinces on an access. */
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Tick pioDelay;
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public:
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typedef BasicPioDeviceParams Params;
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BasicPioDevice(const Params *p, Addr size);
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const Params *
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params() const
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{
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return dynamic_cast<const Params *>(_params);
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}
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/**
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* Determine the address ranges that this device responds to.
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*
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* @return a list of non-overlapping address ranges
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*/
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virtual AddrRangeList getAddrRanges() const;
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};
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#endif // __DEV_IO_DEVICE_HH__
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