changeset 5eede8466691 in /z/repo/gem5
details: http://repo.gem5.org/gem5?cmd=changeset;node=5eede8466691
description:
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.
diffstat:
src/dev/arm/EnergyCtrl.py | 47 ++++++++
src/dev/arm/SConscript | 3 +
src/dev/arm/energy_ctrl.cc | 264 +++++++++++++++++++++++++++++++++++++++++++++
src/dev/arm/energy_ctrl.hh | 187 +++++++++++++++++++++++++++++++
4 files changed, 501 insertions(+), 0 deletions(-)
diffs (truncated from 535 to 300 lines):
diff -r 77b9f96786c1 -r 5eede8466691 src/dev/arm/EnergyCtrl.py
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/dev/arm/EnergyCtrl.py Sat Sep 20 17:18:23 2014 -0400
@@ -0,0 +1,47 @@
+# Copyright (c) 2012-2014 ARM Limited
+# All rights reserved.
+#
+# The license below extends only to copyright in the software and shall
+# 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
+# Akash Bagdia
+
+from m5.params import *
+from m5.SimObject import SimObject
+from Device import BasicPioDevice
+from m5.proxy import *
+
+class EnergyCtrl(BasicPioDevice):
+ type = 'EnergyCtrl'
+ cxx_header = "dev/arm/energy_ctrl.hh"
+ dvfs_handler = Param.DVFSHandler(Parent.dvfs_handler, "DVFS handler")
diff -r 77b9f96786c1 -r 5eede8466691 src/dev/arm/SConscript
--- a/src/dev/arm/SConscript Mon Jun 16 14:59:44 2014 +0100
+++ b/src/dev/arm/SConscript Sat Sep 20 17:18:23 2014 -0400
@@ -42,6 +42,7 @@
if env['TARGET_ISA'] == 'arm':
SimObject('Gic.py')
SimObject('RealView.py')
+ SimObject('EnergyCtrl.py')
Source('a9scu.cc')
Source('amba_device.cc')
@@ -59,6 +60,7 @@
Source('rtc_pl031.cc')
Source('timer_cpulocal.cc')
Source('vgic.cc')
+ Source('energy_ctrl.cc')
DebugFlag('AMBA')
DebugFlag('HDLcd')
@@ -66,4 +68,5 @@
DebugFlag('Pl050')
DebugFlag('GIC')
DebugFlag('RVCTRL')
+ DebugFlag('EnergyCtrl')
DebugFlag('VGIC')
diff -r 77b9f96786c1 -r 5eede8466691 src/dev/arm/energy_ctrl.cc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/dev/arm/energy_ctrl.cc Sat Sep 20 17:18:23 2014 -0400
@@ -0,0 +1,264 @@
+/*
+ * Copyright (c) 2012-2014 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * 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
+ * Akash Bagdia
+ * Stephan Diestelhorst
+ */
+
+#include "debug/EnergyCtrl.hh"
+#include "dev/arm/energy_ctrl.hh"
+#include "mem/packet.hh"
+#include "mem/packet_access.hh"
+#include "params/EnergyCtrl.hh"
+#include "sim/dvfs_handler.hh"
+
+EnergyCtrl::EnergyCtrl(const Params *p)
+ : BasicPioDevice(p, PIO_NUM_FIELDS * 4), // each field is 32 bit
+ dvfsHandler(p->dvfs_handler),
+ domainID(0),
+ domainIDIndexToRead(0),
+ perfLevelAck(0),
+ perfLevelToRead(0),
+ updateAckEvent(this)
+{
+ fatal_if(!p->dvfs_handler, "EnergyCtrl: Needs a DVFSHandler for a "
+ "functioning system.\n");
+}
+
+Tick
+EnergyCtrl::read(PacketPtr pkt)
+{
+ assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
+ assert(pkt->getSize() == 4);
+ pkt->allocate();
+
+ Addr daddr = pkt->getAddr() - pioAddr;
+ assert((daddr & 3) == 0);
+ Registers reg = Registers(daddr / 4);
+
+ if (!dvfsHandler->isEnabled()) {
+ // NB: Zero is a good response if the handler is disabled
+ pkt->set<uint32_t>(0);
+ warn_once("EnergyCtrl: Disabled handler, ignoring read from reg %i\n",
+ reg);
+ DPRINTF(EnergyCtrl, "dvfs handler disabled, return 0 for read from "\
+ "reg %i\n", reg);
+ pkt->makeAtomicResponse();
+ return pioDelay;
+ }
+
+ uint32_t result = 0;
+ Tick period;
+ double voltage;
+
+ switch(reg) {
+ case DVFS_HANDLER_STATUS:
+ result = 1;
+ DPRINTF(EnergyCtrl, "dvfs handler enabled\n");
+ break;
+ case DVFS_NUM_DOMAINS:
+ result = dvfsHandler->numDomains();
+ DPRINTF(EnergyCtrl, "reading number of domains %d\n", result);
+ break;
+ case DVFS_DOMAINID_AT_INDEX:
+ result = dvfsHandler->domainID(domainIDIndexToRead);
+ DPRINTF(EnergyCtrl, "reading domain id at index %d as %d\n",
+ domainIDIndexToRead, result);
+ break;
+ case DVFS_HANDLER_TRANS_LATENCY:
+ // Return transition latency in nanoseconds
+ result = dvfsHandler->transLatency() / SimClock::Int::ns;
+ DPRINTF(EnergyCtrl, "reading dvfs handler trans latency %d ns\n",
+ result);
+ break;
+ case DOMAIN_ID:
+ result = domainID;
+ DPRINTF(EnergyCtrl, "reading domain id:%d\n", result);
+ break;
+ case PERF_LEVEL:
+ result = dvfsHandler->perfLevel(domainID);
+ DPRINTF(EnergyCtrl, "reading domain %d perf level: %d\n",
+ domainID, result);
+ break;
+ case PERF_LEVEL_ACK:
+ result = perfLevelAck;
+ DPRINTF(EnergyCtrl, "reading ack:%d\n", result);
+ // Signal is set for a single read only
+ if (result == 1)
+ perfLevelAck = 0;
+ break;
+ case NUM_OF_PERF_LEVELS:
+ result = dvfsHandler->numPerfLevels(domainID);
+ DPRINTF(EnergyCtrl, "reading num of perf level:%d\n", result);
+ break;
+ case FREQ_AT_PERF_LEVEL:
+ period = dvfsHandler->clkPeriodAtPerfLevel(domainID, perfLevelToRead);
+ result = ticksTokHz(period);
+ DPRINTF(EnergyCtrl, "reading freq %d KHz at perf level: %d\n",
+ result, perfLevelToRead);
+ break;
+ case VOLT_AT_PERF_LEVEL:
+ voltage = dvfsHandler->voltageAtPerfLevel(domainID, perfLevelToRead);
+ result = toMicroVolt(voltage);
+ DPRINTF(EnergyCtrl, "reading voltage %d u-volt at perf level: %d\n",
+ result, perfLevelToRead);
+ break;
+ default:
+ panic("Tried to read EnergyCtrl at offset %#x / reg %i\n", daddr,
+ reg);
+ }
+ pkt->set<uint32_t>(result);
+ pkt->makeAtomicResponse();
+ return pioDelay;
+}
+
+Tick
+EnergyCtrl::write(PacketPtr pkt)
+{
+ assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
+ assert(pkt->getSize() == 4);
+
+ uint32_t data;
+ data = pkt->get<uint32_t>();
+
+ Addr daddr = pkt->getAddr() - pioAddr;
+ assert((daddr & 3) == 0);
+ Registers reg = Registers(daddr / 4);
+
+ if (!dvfsHandler->isEnabled()) {
+ // Ignore writes to a disabled controller
+ warn_once("EnergyCtrl: Disabled handler, ignoring write %u to "\
+ "reg %i\n", data, reg);
+ DPRINTF(EnergyCtrl, "dvfs handler disabled, ignoring write %u to "\
+ "reg %i\n", data, reg);
+ pkt->makeAtomicResponse();
+ return pioDelay;
+ }
+
+ switch(reg) {
+ case DVFS_DOMAINID_AT_INDEX:
+ domainIDIndexToRead = data;
+ DPRINTF(EnergyCtrl, "writing domain id index:%d\n",
+ domainIDIndexToRead);
+ break;
+ case DOMAIN_ID:
+ // Extra check to ensure that a valid domain ID is being queried
+ if (dvfsHandler->validDomainID(data)) {
+ domainID = data;
+ DPRINTF(EnergyCtrl, "writing domain id:%d\n", domainID);
+ } else {
+ DPRINTF(EnergyCtrl, "invalid domain id:%d\n", domainID);
+ }
+ break;
+ case PERF_LEVEL:
+ if (dvfsHandler->perfLevel(domainID, data)) {
+ if (updateAckEvent.scheduled()) {
+ // The OS driver is trying to change the perf level while
+ // another change is in flight. This is fine, but only a
+ // single acknowledgment will be sent.
+ DPRINTF(EnergyCtrl, "descheduling previous pending ack "\
+ "event\n");
+ deschedule(updateAckEvent);
+ }
+ schedule(updateAckEvent, curTick() + dvfsHandler->transLatency());
+ DPRINTF(EnergyCtrl, "writing domain %d perf level: %d\n",
+ domainID, data);
+ } else {
+ DPRINTF(EnergyCtrl, "invalid / ineffective perf level:%d for "\
+ "domain:%d\n", data, domainID);
+ }
+ break;
+ case PERF_LEVEL_TO_READ:
+ perfLevelToRead = data;
+ DPRINTF(EnergyCtrl, "writing perf level to read opp at: %d\n",
+ data);
+ break;
+ default:
+ panic("Tried to write EnergyCtrl at offset %#x\n", daddr);
+ break;
+ }
+
+ pkt->makeAtomicResponse();
+ return pioDelay;
+}
+
+void
+EnergyCtrl::serialize(std::ostream &os)
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