energy: Memory-mapped Energy Controller component
This patch provides an Energy Controller device that provides software (driver) access to a DVFS handler. The device is currently residing in the dev/arm tree, but there is nothing inherently ARM specific in the behaviour. It is currently only tested and supported for ARM Linux, hence the location.
This commit is contained in:
Akash Bagdia
parent
4422d1322a
commit
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4 changed files with 501 additions and 0 deletions
47
src/dev/arm/EnergyCtrl.py
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47
src/dev/arm/EnergyCtrl.py
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@ -0,0 +1,47 @@
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# Copyright (c) 2012-2014 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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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
|
||||
# met: redistributions of source code must retain the above copyright
|
||||
# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
|
||||
# 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
|
||||
# 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: Vasileios Spiliopoulos
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# Akash Bagdia
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from m5.params import *
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from m5.SimObject import SimObject
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from Device import BasicPioDevice
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from m5.proxy import *
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class EnergyCtrl(BasicPioDevice):
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type = 'EnergyCtrl'
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cxx_header = "dev/arm/energy_ctrl.hh"
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dvfs_handler = Param.DVFSHandler(Parent.dvfs_handler, "DVFS handler")
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@ -42,6 +42,7 @@ Import('*')
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if env['TARGET_ISA'] == 'arm':
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SimObject('Gic.py')
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SimObject('RealView.py')
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SimObject('EnergyCtrl.py')
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Source('a9scu.cc')
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Source('amba_device.cc')
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@ -59,6 +60,7 @@ if env['TARGET_ISA'] == 'arm':
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Source('rtc_pl031.cc')
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Source('timer_cpulocal.cc')
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Source('vgic.cc')
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Source('energy_ctrl.cc')
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DebugFlag('AMBA')
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DebugFlag('HDLcd')
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@ -66,4 +68,5 @@ if env['TARGET_ISA'] == 'arm':
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DebugFlag('Pl050')
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DebugFlag('GIC')
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DebugFlag('RVCTRL')
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DebugFlag('EnergyCtrl')
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DebugFlag('VGIC')
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264
src/dev/arm/energy_ctrl.cc
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264
src/dev/arm/energy_ctrl.cc
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@ -0,0 +1,264 @@
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/*
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* Copyright (c) 2012-2014 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
|
||||
* 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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* 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
|
||||
* 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: Vasileios Spiliopoulos
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* Akash Bagdia
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* Stephan Diestelhorst
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*/
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#include "debug/EnergyCtrl.hh"
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#include "dev/arm/energy_ctrl.hh"
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#include "mem/packet.hh"
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#include "mem/packet_access.hh"
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#include "params/EnergyCtrl.hh"
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#include "sim/dvfs_handler.hh"
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EnergyCtrl::EnergyCtrl(const Params *p)
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: BasicPioDevice(p, PIO_NUM_FIELDS * 4), // each field is 32 bit
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dvfsHandler(p->dvfs_handler),
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domainID(0),
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domainIDIndexToRead(0),
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perfLevelAck(0),
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perfLevelToRead(0),
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updateAckEvent(this)
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{
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fatal_if(!p->dvfs_handler, "EnergyCtrl: Needs a DVFSHandler for a "
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"functioning system.\n");
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}
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Tick
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EnergyCtrl::read(PacketPtr pkt)
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{
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assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
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assert(pkt->getSize() == 4);
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pkt->allocate();
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Addr daddr = pkt->getAddr() - pioAddr;
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assert((daddr & 3) == 0);
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Registers reg = Registers(daddr / 4);
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if (!dvfsHandler->isEnabled()) {
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// NB: Zero is a good response if the handler is disabled
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pkt->set<uint32_t>(0);
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warn_once("EnergyCtrl: Disabled handler, ignoring read from reg %i\n",
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reg);
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DPRINTF(EnergyCtrl, "dvfs handler disabled, return 0 for read from "\
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"reg %i\n", reg);
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pkt->makeAtomicResponse();
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return pioDelay;
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}
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uint32_t result = 0;
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Tick period;
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double voltage;
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switch(reg) {
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case DVFS_HANDLER_STATUS:
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result = 1;
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DPRINTF(EnergyCtrl, "dvfs handler enabled\n");
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break;
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case DVFS_NUM_DOMAINS:
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result = dvfsHandler->numDomains();
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DPRINTF(EnergyCtrl, "reading number of domains %d\n", result);
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break;
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case DVFS_DOMAINID_AT_INDEX:
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result = dvfsHandler->domainID(domainIDIndexToRead);
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DPRINTF(EnergyCtrl, "reading domain id at index %d as %d\n",
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domainIDIndexToRead, result);
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break;
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case DVFS_HANDLER_TRANS_LATENCY:
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// Return transition latency in nanoseconds
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result = dvfsHandler->transLatency() / SimClock::Int::ns;
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DPRINTF(EnergyCtrl, "reading dvfs handler trans latency %d ns\n",
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result);
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break;
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case DOMAIN_ID:
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result = domainID;
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DPRINTF(EnergyCtrl, "reading domain id:%d\n", result);
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break;
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case PERF_LEVEL:
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result = dvfsHandler->perfLevel(domainID);
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DPRINTF(EnergyCtrl, "reading domain %d perf level: %d\n",
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domainID, result);
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break;
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case PERF_LEVEL_ACK:
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result = perfLevelAck;
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DPRINTF(EnergyCtrl, "reading ack:%d\n", result);
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// Signal is set for a single read only
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if (result == 1)
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perfLevelAck = 0;
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break;
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case NUM_OF_PERF_LEVELS:
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result = dvfsHandler->numPerfLevels(domainID);
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DPRINTF(EnergyCtrl, "reading num of perf level:%d\n", result);
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break;
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case FREQ_AT_PERF_LEVEL:
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period = dvfsHandler->clkPeriodAtPerfLevel(domainID, perfLevelToRead);
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result = ticksTokHz(period);
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DPRINTF(EnergyCtrl, "reading freq %d KHz at perf level: %d\n",
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result, perfLevelToRead);
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break;
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case VOLT_AT_PERF_LEVEL:
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voltage = dvfsHandler->voltageAtPerfLevel(domainID, perfLevelToRead);
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result = toMicroVolt(voltage);
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DPRINTF(EnergyCtrl, "reading voltage %d u-volt at perf level: %d\n",
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result, perfLevelToRead);
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break;
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default:
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panic("Tried to read EnergyCtrl at offset %#x / reg %i\n", daddr,
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reg);
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}
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pkt->set<uint32_t>(result);
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pkt->makeAtomicResponse();
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return pioDelay;
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}
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Tick
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EnergyCtrl::write(PacketPtr pkt)
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{
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assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
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assert(pkt->getSize() == 4);
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uint32_t data;
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data = pkt->get<uint32_t>();
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Addr daddr = pkt->getAddr() - pioAddr;
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assert((daddr & 3) == 0);
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Registers reg = Registers(daddr / 4);
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if (!dvfsHandler->isEnabled()) {
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// Ignore writes to a disabled controller
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warn_once("EnergyCtrl: Disabled handler, ignoring write %u to "\
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"reg %i\n", data, reg);
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DPRINTF(EnergyCtrl, "dvfs handler disabled, ignoring write %u to "\
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"reg %i\n", data, reg);
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pkt->makeAtomicResponse();
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return pioDelay;
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}
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switch(reg) {
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case DVFS_DOMAINID_AT_INDEX:
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domainIDIndexToRead = data;
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DPRINTF(EnergyCtrl, "writing domain id index:%d\n",
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domainIDIndexToRead);
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break;
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case DOMAIN_ID:
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// Extra check to ensure that a valid domain ID is being queried
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if (dvfsHandler->validDomainID(data)) {
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domainID = data;
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DPRINTF(EnergyCtrl, "writing domain id:%d\n", domainID);
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} else {
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DPRINTF(EnergyCtrl, "invalid domain id:%d\n", domainID);
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}
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break;
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case PERF_LEVEL:
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if (dvfsHandler->perfLevel(domainID, data)) {
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if (updateAckEvent.scheduled()) {
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// The OS driver is trying to change the perf level while
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// another change is in flight. This is fine, but only a
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// single acknowledgment will be sent.
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DPRINTF(EnergyCtrl, "descheduling previous pending ack "\
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"event\n");
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deschedule(updateAckEvent);
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}
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schedule(updateAckEvent, curTick() + dvfsHandler->transLatency());
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DPRINTF(EnergyCtrl, "writing domain %d perf level: %d\n",
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domainID, data);
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} else {
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DPRINTF(EnergyCtrl, "invalid / ineffective perf level:%d for "\
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"domain:%d\n", data, domainID);
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}
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break;
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case PERF_LEVEL_TO_READ:
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perfLevelToRead = data;
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DPRINTF(EnergyCtrl, "writing perf level to read opp at: %d\n",
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data);
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break;
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default:
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panic("Tried to write EnergyCtrl at offset %#x\n", daddr);
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break;
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}
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pkt->makeAtomicResponse();
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return pioDelay;
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}
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void
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EnergyCtrl::serialize(std::ostream &os)
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{
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SERIALIZE_SCALAR(domainID);
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SERIALIZE_SCALAR(domainIDIndexToRead);
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SERIALIZE_SCALAR(perfLevelToRead);
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SERIALIZE_SCALAR(perfLevelAck);
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Tick next_event = updateAckEvent.scheduled() ? updateAckEvent.when() : 0;
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SERIALIZE_SCALAR(next_event);
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}
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void
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EnergyCtrl::unserialize(Checkpoint *cp, const std::string §ion)
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{
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UNSERIALIZE_SCALAR(domainID);
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UNSERIALIZE_SCALAR(domainIDIndexToRead);
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UNSERIALIZE_SCALAR(perfLevelToRead);
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UNSERIALIZE_SCALAR(perfLevelAck);
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Tick next_event = 0;
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UNSERIALIZE_SCALAR(next_event);
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// restore scheduled events
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if (next_event != 0) {
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schedule(updateAckEvent, next_event);
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}
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}
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EnergyCtrl * EnergyCtrlParams::create()
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{
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return new EnergyCtrl(this);
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}
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void
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EnergyCtrl::startup()
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{
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if (!dvfsHandler->isEnabled()) {
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warn("Existing EnergyCtrl, but no enabled DVFSHandler found.\n");
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}
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}
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void
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EnergyCtrl::init()
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{
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BasicPioDevice::init();
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}
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187
src/dev/arm/energy_ctrl.hh
Normal file
187
src/dev/arm/energy_ctrl.hh
Normal file
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@ -0,0 +1,187 @@
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/*
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* Copyright (c) 2012-2014 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
|
||||
* property including but not limited to intellectual property relating
|
||||
* to a hardware implementation of the functionality of the software
|
||||
* licensed hereunder. You may use the software subject to the license
|
||||
* terms below provided that you ensure that this notice is replicated
|
||||
* unmodified and in its entirety in all distributions of the software,
|
||||
* modified or unmodified, in source code or in binary form.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions are
|
||||
* met: redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer;
|
||||
* redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution;
|
||||
* neither the name of the copyright holders nor the names of its
|
||||
* contributors may be used to endorse or promote products derived from
|
||||
* this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
* Authors: Vasileios Spiliopoulos
|
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* Akash Bagdia
|
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* Stephan Diestelhorst
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*/
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/**
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* @file
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* The energy controller is a device being used to manage power and energy
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* related control operations within the system. It provides the necessary
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* software interface to the kernel. The kernel will require gem5 specific
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* drivers to access this device.
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*
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* Tasks handled by the controller are:
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* a) Dynamic voltage and frequency scaling control operations
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*
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* Note that the registers defined do not resemble any specific controller
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* device in real hardware. They are currently design to accomodate the gem5
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* system requirements.
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*/
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#ifndef __DEV_ARM_ENERGY_CTRL_HH__
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#define __DEV_ARM_ENERGY_CTRL_HH__
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#include "dev/io_device.hh"
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#include "params/EnergyCtrl.hh"
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class DVFSHandler;
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class EnergyCtrl : public BasicPioDevice
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{
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public:
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/**
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* Discovery flows:
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* ----------------
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* * get basic DVFS handler information
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* read(DVFS_HANDLER_STATUS)
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* read(DVFS_HANDLER_TRANS_LATENCY)
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*
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* * get the number of domain IDs
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* read(DVFS_NUM_DOMAINS) -> domains
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*
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* * query the driver to get the IDs for all i in domains
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* write(DVFS_DOMAINID_AT_INDEX <- i)
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* read(DOMAIN_ID) -> domainID_i
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*
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* * for each domainID i get voltage / frequency pairs
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* write(DOMAIN_ID <- domainID_i)
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* read(NUM_OF_PERF_LEVELS) -> levels_i
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* * for each l in levels_i
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* write(PERF_LEVEL_TO_READ <- l)
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* read(FREQ_AT_PERF_LEVEL) -> freq_l_i
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* read(VOLT_AT_PERF_LEVEL) -> volt_l_i
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*
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*
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* Setting a specific performance level (V/F combination)
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* ------------------------------------------------------
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* * get performance for domain_ID i
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* write(DOMAIN_ID <- i)
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* read(PERF_LEVEL) -> perf_level_i
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*
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* * set performance for domain_ID i
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* write(DOMAIN_ID <- i)
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* write(PERF_LEVEL <- perf_level_i)
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* * wait for DVFS transition completion
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* while (!read(PERF_LEVEL_ACK));
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*/
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enum Registers {
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DVFS_HANDLER_STATUS = 0,
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DVFS_NUM_DOMAINS,
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DVFS_DOMAINID_AT_INDEX,
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DVFS_HANDLER_TRANS_LATENCY,
|
||||
DOMAIN_ID,
|
||||
PERF_LEVEL,
|
||||
PERF_LEVEL_ACK,
|
||||
NUM_OF_PERF_LEVELS,
|
||||
PERF_LEVEL_TO_READ,
|
||||
FREQ_AT_PERF_LEVEL,
|
||||
VOLT_AT_PERF_LEVEL,
|
||||
PIO_NUM_FIELDS
|
||||
};
|
||||
|
||||
typedef EnergyCtrlParams Params;
|
||||
EnergyCtrl(const Params *p);
|
||||
|
||||
/**
|
||||
* Read command sent to the device
|
||||
* @param pkt Packet describing this request
|
||||
* @return number of ticks it took to complete
|
||||
*/
|
||||
virtual Tick read(PacketPtr pkt);
|
||||
/**
|
||||
* Write command sent to the device
|
||||
* @param pkt Packet describing this request
|
||||
* @return number of ticks it took to complete
|
||||
*/
|
||||
virtual Tick write(PacketPtr pkt);
|
||||
|
||||
void serialize(std::ostream &os);
|
||||
void unserialize(Checkpoint *cp, const std::string §ion);
|
||||
|
||||
void startup();
|
||||
void init();
|
||||
|
||||
private:
|
||||
DVFSHandler *dvfsHandler;
|
||||
|
||||
/**
|
||||
* Cluster ID (DOMAIN_ID) R/W register, programmed to ID of the domain for
|
||||
* which the set/get performance level command can be issued
|
||||
*/
|
||||
uint32_t domainID;
|
||||
|
||||
/**
|
||||
* Index for getting the domain ID from the domain ID list available with
|
||||
* the DVFS handler
|
||||
*/
|
||||
uint32_t domainIDIndexToRead;
|
||||
|
||||
/**
|
||||
* Acknowledgment (PERF_LEVEL_ACK) RO register, software polls this
|
||||
* register to read back the status of the last programmed change in the
|
||||
* domain ID and/or the performance level. Valid values are:
|
||||
* '0' - Ack is not OK yet
|
||||
* '1' - Ack is OK
|
||||
* It is a read destructive register with a read of '1' resets the ack to
|
||||
* '0'.
|
||||
*/
|
||||
uint32_t perfLevelAck;
|
||||
|
||||
uint32_t perfLevelToRead;
|
||||
|
||||
static uint32_t ticksTokHz(Tick period) {
|
||||
return (uint32_t)(SimClock::Int::ms / period);
|
||||
}
|
||||
|
||||
static uint32_t toMicroVolt(double voltage) {
|
||||
return (uint32_t)(voltage * 1000000);
|
||||
}
|
||||
|
||||
/**
|
||||
* Update the acknowledgment that is read back by the software to confirm
|
||||
* newly requested performance level has been set.
|
||||
*/
|
||||
void updatePLAck() {
|
||||
perfLevelAck = 1;
|
||||
}
|
||||
|
||||
EventWrapper<EnergyCtrl, &EnergyCtrl::updatePLAck> updateAckEvent;
|
||||
};
|
||||
#endif //__DEV_ARM_ENERGY_CTRL_HH__
|
||||
Loading…
Reference in a new issue