config: Use SimpleDRAM in full-system, and with o3 and inorder

This patch favours using SimpleDRAM with the default timing instead of
SimpleMemory for all regressions that involve the o3 or inorder CPU,
or are full system (in other words, where the actual performance of
the memory is important for the overall performance).

Moving forward, the solution for FSConfig and the users of fs.py and
se.py is probably something similar to what we use to choose the CPU
type. I envision a few pre-set configurations SimpleLPDDR2,
SimpleDDR3, etc that can be choosen by a dram_type option. Feedback on
this part is welcome.

This patch changes plenty stats and adds all the DRAM controller
related stats. A follow-on patch updates the relevant statistics. The
total run-time for the entire regression goes up with ~5% with this
patch due to the added complexity of the SimpleDRAM model. This is a
concious trade-off to ensure that the model is properly tested.

configs/common/FSConfig.py

@@ -73,7 +73,7 @@ def makeLinuxAlphaSystem(mem_mode, mdesc = None):
     # base address (including the PCI config space)
     self.bridge = Bridge(delay='50ns',
                          ranges = [AddrRange(IO_address_space_base, Addr.max)])
-    self.physmem = SimpleMemory(range = AddrRange(mdesc.mem()))
+    self.physmem = SimpleDRAM(range = AddrRange(mdesc.mem()))
     self.bridge.master = self.iobus.slave
     self.bridge.slave = self.membus.master
     self.physmem.port = self.membus.master
@@ -109,7 +109,7 @@ def makeLinuxAlphaRubySystem(mem_mode, mdesc = None):
         ide = IdeController(disks=[Parent.disk0, Parent.disk2],
                             pci_func=0, pci_dev=0, pci_bus=0)
         
-    physmem = SimpleMemory(range = AddrRange(mdesc.mem()))
+    physmem = SimpleDRAM(range = AddrRange(mdesc.mem()))
     self = LinuxAlphaSystem(physmem = physmem)
     if not mdesc:
         # generic system
@@ -178,9 +178,9 @@ def makeSparcSystem(mem_mode, mdesc = None):
     self.t1000 = T1000()
     self.t1000.attachOnChipIO(self.membus)
     self.t1000.attachIO(self.iobus)
-    self.physmem = SimpleMemory(range = AddrRange(Addr('1MB'), size = '64MB'),
+    self.physmem = SimpleDRAM(range = AddrRange(Addr('1MB'), size = '64MB'),
                                 zero = True)
-    self.physmem2 = SimpleMemory(range = AddrRange(Addr('2GB'), size ='256MB'),
+    self.physmem2 = SimpleDRAM(range = AddrRange(Addr('2GB'), size ='256MB'),
                                  zero = True)
     self.bridge.master = self.iobus.slave
     self.bridge.slave = self.membus.master
@@ -271,7 +271,7 @@ def makeArmSystem(mem_mode, machine_type, mdesc = None, bare_metal=False):
     if bare_metal:
         # EOT character on UART will end the simulation
         self.realview.uart.end_on_eot = True
-        self.physmem = SimpleMemory(range = AddrRange(Addr(mdesc.mem())),
+        self.physmem = SimpleDRAM(range = AddrRange(Addr(mdesc.mem())),
                                     zero = True)
     else:
         self.kernel = binary('vmlinux.arm.smp.fb.2.6.38.8')
@@ -285,7 +285,7 @@ def makeArmSystem(mem_mode, machine_type, mdesc = None, bare_metal=False):
         boot_flags = 'earlyprintk console=ttyAMA0 lpj=19988480 norandmaps ' + \
                      'rw loglevel=8 mem=%s root=/dev/sda1' % mdesc.mem()
 
-        self.physmem = SimpleMemory(range =
+        self.physmem = SimpleDRAM(range =
                                     AddrRange(self.realview.mem_start_addr,
                                               size = mdesc.mem()),
                                     conf_table_reported = True)
@@ -323,7 +323,7 @@ def makeLinuxMipsSystem(mem_mode, mdesc = None):
     self.iobus = NoncoherentBus()
     self.membus = MemBus()
     self.bridge = Bridge(delay='50ns')
-    self.physmem = SimpleMemory(range = AddrRange('1GB'))
+    self.physmem = SimpleDRAM(range = AddrRange('1GB'))
     self.bridge.master = self.iobus.slave
     self.bridge.slave = self.membus.master
     self.physmem.port = self.membus.master
@@ -428,7 +428,7 @@ def makeX86System(mem_mode, numCPUs = 1, mdesc = None, self = None, Ruby = False
     self.mem_mode = mem_mode
 
     # Physical memory
-    self.physmem = SimpleMemory(range = AddrRange(mdesc.mem()))
+    self.physmem = SimpleDRAM(range = AddrRange(mdesc.mem()))
 
     # Platform
     self.pc = Pc()

tests/configs/inorder-timing.py

@@ -50,7 +50,7 @@ cpu.addTwoLevelCacheHierarchy(MyL1Cache(size = '128kB'),
 cpu.clock = '2GHz'
 
 system = System(cpu = cpu,
-                physmem = SimpleMemory(),
+                physmem = SimpleDRAM(),
                 membus = CoherentBus())
 system.system_port = system.membus.slave
 system.physmem.port = system.membus.master

tests/configs/o3-timing-checker.py

@@ -63,7 +63,7 @@ cpu.addTwoLevelCacheHierarchy(MyL1Cache(size = '128kB'),
 cpu.clock = '2GHz'
 
 system = System(cpu = cpu,
-                physmem = SimpleMemory(),
+                physmem = SimpleDRAM(),
                 membus = CoherentBus())
 system.system_port = system.membus.slave
 system.physmem.port = system.membus.master

tests/configs/o3-timing-mp.py

@@ -35,7 +35,7 @@ nb_cores = 4
 cpus = [ DerivO3CPU(cpu_id=i) for i in xrange(nb_cores) ]
 
 # system simulated
-system = System(cpu = cpus, physmem = SimpleMemory(), membus = CoherentBus())
+system = System(cpu = cpus, physmem = SimpleDRAM(), membus = CoherentBus())
 
 # l2cache & bus
 system.toL2Bus = CoherentBus(clock = '2GHz')

tests/configs/o3-timing.py

@@ -52,7 +52,7 @@ cpu.addTwoLevelCacheHierarchy(MyL1Cache(size = '128kB'),
 cpu.clock = '2GHz'
 
 system = System(cpu = cpu,
-                physmem = SimpleMemory(),
+                physmem = SimpleDRAM(),
                 membus = CoherentBus())
 system.system_port = system.membus.slave
 system.physmem.port = system.membus.master