devices.py revision 11682:612f75cf36a0 
1# Copyright (c) 2016 ARM Limited
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
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8# licensed hereunder.  You may use the software subject to the license
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15# met: redistributions of source code must retain the above copyright
16# notice, this list of conditions and the following disclaimer;
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22# this software without specific prior written permission.
23#
24# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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27# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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29# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
30# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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34# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35#
36# Authors: Andreas Sandberg
37#          Gabor Dozsa
38
39# System components used by the bigLITTLE.py configuration script
40
41import m5
42from m5.objects import *
43m5.util.addToPath('../../')
44from common.Caches import *
45from common import CpuConfig
46
47class L1I(L1_ICache):
48    hit_latency = 1
49    response_latency = 1
50    mshrs = 4
51    tgts_per_mshr = 8
52    size = '48kB'
53    assoc = 3
54
55
56class L1D(L1_DCache):
57    hit_latency = 2
58    response_latency = 1
59    mshrs = 16
60    tgts_per_mshr = 16
61    size = '32kB'
62    assoc = 2
63    write_buffers = 16
64
65
66class WalkCache(PageTableWalkerCache):
67    hit_latency = 4
68    response_latency = 4
69    mshrs = 6
70    tgts_per_mshr = 8
71    size = '1kB'
72    assoc = 8
73    write_buffers = 16
74
75
76class L2(L2Cache):
77    hit_latency = 12
78    response_latency = 5
79    mshrs = 32
80    tgts_per_mshr = 8
81    size = '1MB'
82    assoc = 16
83    write_buffers = 8
84    clusivity='mostly_excl'
85
86
87class L3(Cache):
88    size = '16MB'
89    assoc = 16
90    hit_latency = 20
91    response_latency = 20
92    mshrs = 20
93    tgts_per_mshr = 12
94    clusivity='mostly_excl'
95
96
97class MemBus(SystemXBar):
98    badaddr_responder = BadAddr(warn_access="warn")
99    default = Self.badaddr_responder.pio
100
101
102class CpuCluster(SubSystem):
103    def __init__(self, system,  num_cpus, cpu_clock, cpu_voltage,
104                 cpu_type, l1i_type, l1d_type, wcache_type, l2_type):
105        super(CpuCluster, self).__init__()
106        self._cpu_type = cpu_type
107        self._l1i_type = l1i_type
108        self._l1d_type = l1d_type
109        self._wcache_type = wcache_type
110        self._l2_type = l2_type
111
112        assert num_cpus > 0
113
114        self.voltage_domain = VoltageDomain(voltage=cpu_voltage)
115        self.clk_domain = SrcClockDomain(clock=cpu_clock,
116                                         voltage_domain=self.voltage_domain)
117
118        self.cpus = [ self._cpu_type(cpu_id=system.numCpus() + idx,
119                                     clk_domain=self.clk_domain)
120                      for idx in range(num_cpus) ]
121
122        for cpu in self.cpus:
123            cpu.createThreads()
124            cpu.createInterruptController()
125            cpu.socket_id = system.numCpuClusters()
126        system.addCpuCluster(self, num_cpus)
127
128    def requireCaches(self):
129        return self._cpu_type.require_caches()
130
131    def memoryMode(self):
132        return self._cpu_type.memory_mode()
133
134    def addL1(self):
135        for cpu in self.cpus:
136            l1i = None if self._l1i_type is None else self._l1i_type()
137            l1d = None if self._l1d_type is None else self._l1d_type()
138            iwc = None if self._wcache_type is None else self._wcache_type()
139            dwc = None if self._wcache_type is None else self._wcache_type()
140            cpu.addPrivateSplitL1Caches(l1i, l1d, iwc, dwc)
141
142    def addL2(self, clk_domain):
143        if self._l2_type is None:
144            return
145        self.toL2Bus = L2XBar(width=64, clk_domain=clk_domain)
146        self.l2 = self._l2_type()
147        for cpu in self.cpus:
148            cpu.connectAllPorts(self.toL2Bus)
149        self.toL2Bus.master = self.l2.cpu_side
150
151    def connectMemSide(self, bus):
152        bus.slave
153        try:
154            self.l2.mem_side = bus.slave
155        except AttributeError:
156            for cpu in self.cpus:
157                cpu.connectAllPorts(bus)
158
159
160class AtomicCluster(CpuCluster):
161    def __init__(self, system, num_cpus, cpu_clock, cpu_voltage="1.0V"):
162        cpu_config = [ CpuConfig.get("atomic"), None, None, None, None ]
163        super(AtomicCluster, self).__init__(system, num_cpus, cpu_clock,
164                                            cpu_voltage, *cpu_config)
165    def addL1(self):
166        pass
167
168
169class SimpleSystem(LinuxArmSystem):
170    cache_line_size = 64
171
172    def __init__(self, **kwargs):
173        super(SimpleSystem, self).__init__(**kwargs)
174
175        self.voltage_domain = VoltageDomain(voltage="1.0V")
176        self.clk_domain = SrcClockDomain(clock="1GHz",
177                                         voltage_domain=Parent.voltage_domain)
178
179        self.realview = VExpress_GEM5_V1()
180
181        self.gic_cpu_addr = self.realview.gic.cpu_addr
182        self.flags_addr = self.realview.realview_io.pio_addr + 0x30
183
184        self.membus = MemBus()
185
186        self.intrctrl = IntrControl()
187        self.terminal = Terminal()
188        self.vncserver = VncServer()
189
190        self.iobus = IOXBar()
191        # CPUs->PIO
192        self.iobridge = Bridge(delay='50ns')
193        # Device DMA -> MEM
194        self.dmabridge = Bridge(delay='50ns',
195                                ranges=self.realview._mem_regions)
196
197        self._pci_devices = 0
198        self._clusters = []
199        self._num_cpus = 0
200
201    def attach_pci(self, dev):
202        dev.pci_bus, dev.pci_dev, dev.pci_func = (0, self._pci_devices + 1, 0)
203        self._pci_devices += 1
204        self.realview.attachPciDevice(dev, self.iobus)
205
206    def connect(self):
207        self.iobridge.master = self.iobus.slave
208        self.iobridge.slave = self.membus.master
209
210        self.dmabridge.master = self.membus.slave
211        self.dmabridge.slave = self.iobus.master
212
213        self.gic_cpu_addr = self.realview.gic.cpu_addr
214        self.realview.attachOnChipIO(self.membus, self.iobridge)
215        self.realview.attachIO(self.iobus)
216        self.system_port = self.membus.slave
217
218    def numCpuClusters(self):
219        return len(self._clusters)
220
221    def addCpuCluster(self, cpu_cluster, num_cpus):
222        assert cpu_cluster not in self._clusters
223        assert num_cpus > 0
224        self._clusters.append(cpu_cluster)
225        self._num_cpus += num_cpus
226
227    def numCpus(self):
228        return self._num_cpus
229
230    def addCaches(self, need_caches, last_cache_level):
231        if not need_caches:
232            # connect each cluster to the memory hierarchy
233            for cluster in self._clusters:
234                cluster.connectMemSide(self.membus)
235            return
236
237        cluster_mem_bus = self.membus
238        assert last_cache_level >= 1 and last_cache_level <= 3
239        for cluster in self._clusters:
240            cluster.addL1()
241        if last_cache_level > 1:
242            for cluster in self._clusters:
243                cluster.addL2(cluster.clk_domain)
244        if last_cache_level > 2:
245            max_clock_cluster = max(self._clusters,
246                                    key=lambda c: c.clk_domain.clock[0])
247            self.l3 = L3(clk_domain=max_clock_cluster.clk_domain)
248            self.toL3Bus = L2XBar(width=64)
249            self.toL3Bus.master = self.l3.cpu_side
250            self.l3.mem_side = self.membus.slave
251            cluster_mem_bus = self.toL3Bus
252
253        # connect each cluster to the memory hierarchy
254        for cluster in self._clusters:
255            cluster.connectMemSide(cluster_mem_bus)
256