arm, config: added support for ex5 model of big.LITTLE

This patch enables using calibrated big and LITTLE cores, ex5_big and
ex5_LITTLE instead of the default 'arm_detailed' and 'minor' cpus. The ex5
model is based on the Samsung Exynos 5 Octa (5422) SoC. Operation and memory
hierarchy latencies have been calibrated using the lmbench micro-benchmark
suite. The preliminary validation results have been published as: 'Full-System
Simulation of big.LITTLE Multicore Architecture for Performance and Energy
Exploration', in International Symposium on Embedded Multicore/Many-core
Systems-on-Chip (MCSoC'16), Lyon, France (Sep, 2016).

From http://reviews.gem5.org/r/3666

Change-Id: I4935dee0a9222bd1bf7adfccb9443014945bb2d7
Signed-off-by: Anastasiia Butko <abutko@lbl.gov>
Signed-off-by: Pierre-Yves Péneau <pierre-yves.peneau@lirmm.fr>
Reviewed-on: https://gem5-review.googlesource.com/2464
Reviewed-by: Gabor Dozsa <gabor.dozsa@arm.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/configs/example/arm/fs_bigLITTLE.py b/configs/example/arm/fs_bigLITTLE.py
index d6825dfaa..3e7ac2f76 100644
--- a/configs/example/arm/fs_bigLITTLE.py
+++ b/configs/example/arm/fs_bigLITTLE.py
@@ -51,6 +51,8 @@ m5.util.addToPath("../../")
 
 from common import SysPaths
 from common import CpuConfig
+from common import ex5_big
+from common import ex5_LITTLE
 
 import devices
 from devices import AtomicCluster, KvmCluster
@@ -95,6 +97,21 @@ class LittleCluster(devices.CpuCluster):
         super(LittleCluster, self).__init__(system, num_cpus, cpu_clock,
                                          cpu_voltage, *cpu_config)
 
+class Ex5BigCluster(devices.CpuCluster):
+    def __init__(self, system, num_cpus, cpu_clock,
+                 cpu_voltage="1.0V"):
+        cpu_config = [ CpuConfig.get("ex5_big"), ex5_big.L1I, ex5_big.L1D,
+                    ex5_big.WalkCache, ex5_big.L2 ]
+        super(Ex5BigCluster, self).__init__(system, num_cpus, cpu_clock,
+                                         cpu_voltage, *cpu_config)
+
+class Ex5LittleCluster(devices.CpuCluster):
+    def __init__(self, system, num_cpus, cpu_clock,
+                 cpu_voltage="1.0V"):
+        cpu_config = [ CpuConfig.get("ex5_LITTLE"), ex5_LITTLE.L1I,
+                    ex5_LITTLE.L1D, ex5_LITTLE.WalkCache, ex5_LITTLE.L2 ]
+        super(Ex5LittleCluster, self).__init__(system, num_cpus, cpu_clock,
+                                         cpu_voltage, *cpu_config)
 
 def createSystem(caches, kernel, bootscript, disks=[]):
     sys = devices.SimpleSystem(caches, default_mem_size,
@@ -127,6 +144,7 @@ def createSystem(caches, kernel, bootscript, disks=[]):
 cpu_types = {
     "atomic" : (AtomicCluster, AtomicCluster),
     "timing" : (BigCluster, LittleCluster),
+    "exynos" : (Ex5BigCluster, Ex5LittleCluster),
 }
 
 # Only add the KVM CPU if it has been compiled into gem5