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authorDavid Guillen Fandos <david.guillen@arm.com>2015-05-13 15:02:25 +0100
committerDavid Guillen Fandos <david.guillen@arm.com>2015-05-13 15:02:25 +0100
commit65ecd954861aa76532ca79453afcf66a837e1fa6 (patch)
tree65a7eef6c12995b1215ce5b0622da7732fd87cea
parent75c82f1fe3e654ca7d472d8f824424ff450c01d1 (diff)
downloadgem5-65ecd954861aa76532ca79453afcf66a837e1fa6.tar.xz
sim: Thermal support for Linux
This patch enables Linux to read the temperature using hwmon infrastructure. In order to use this in your gem5 you need to compile the kernel using the following configs: CONFIG_HWMON=y CONFIG_SENSORS_VEXPRESS=y And a proper dts file (containing an entry such as): dcc { compatible = "arm,vexpress,config-bus"; arm,vexpress,config-bridge = <&v2m_sysreg>; temp@0 { compatible = "arm,vexpress-temp"; arm,vexpress-sysreg,func = <4 0>; label = "DCC"; }; };
-rw-r--r--src/dev/arm/RealView.py22
-rw-r--r--src/dev/arm/rv_ctrl.cc25
-rw-r--r--src/dev/arm/rv_ctrl.hh28
3 files changed, 74 insertions, 1 deletions
diff --git a/src/dev/arm/RealView.py b/src/dev/arm/RealView.py
index 9d4dc6aaf..17b3eb51d 100644
--- a/src/dev/arm/RealView.py
+++ b/src/dev/arm/RealView.py
@@ -129,6 +129,22 @@ class RealViewOsc(ClockDomain):
freq = Param.Clock("Default frequency")
+class RealViewTemperatureSensor(SimObject):
+ type = 'RealViewTemperatureSensor'
+ cxx_header = "dev/arm/rv_ctrl.hh"
+
+ parent = Param.RealViewCtrl(Parent.any, "RealView controller")
+
+ system = Param.System(Parent.any, "system")
+
+ # See ARM DUI 0447J (ARM Motherboard Express uATX -- V2M-P1) and
+ # the individual core/logic tile reference manuals for details
+ # about the site/position/dcc/device allocation.
+ site = Param.UInt8("Board Site")
+ position = Param.UInt8("Position in device stack")
+ dcc = Param.UInt8("Daughterboard Configuration Controller")
+ device = Param.UInt8("Device ID")
+
class VExpressMCC(SubSystem):
"""ARM V2M-P1 Motherboard Configuration Controller
@@ -140,11 +156,17 @@ Express (V2M-P1) motherboard. See ARM DUI 0447J for details.
class Osc(RealViewOsc):
site, position, dcc = (0, 0, 0)
+ class Temperature(RealViewTemperatureSensor):
+ site, position, dcc = (0, 0, 0)
+
osc_mcc = Osc(device=0, freq="50MHz")
osc_clcd = Osc(device=1, freq="23.75MHz")
osc_peripheral = Osc(device=2, freq="24MHz")
osc_system_bus = Osc(device=4, freq="24MHz")
+ # See Table 4.19 in ARM DUI 0447J (Motherboard Express uATX TRM).
+ temp_crtl = Temperature(device=0)
+
class CoreTile2A15DCC(SubSystem):
"""ARM CoreTile Express A15x2 Daughterboard Configuration Controller
diff --git a/src/dev/arm/rv_ctrl.cc b/src/dev/arm/rv_ctrl.cc
index 507def0c1..f89f23b59 100644
--- a/src/dev/arm/rv_ctrl.cc
+++ b/src/dev/arm/rv_ctrl.cc
@@ -37,11 +37,14 @@
* Authors: Ali Saidi
*/
+#include "dev/arm/rv_ctrl.hh"
+
#include "base/trace.hh"
#include "debug/RVCTRL.hh"
-#include "dev/arm/rv_ctrl.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
+#include "sim/power/thermal_model.hh"
+#include "sim/system.hh"
#include "sim/voltage_domain.hh"
RealViewCtrl::RealViewCtrl(Params *p)
@@ -293,7 +296,21 @@ RealViewOsc::write(uint32_t freq)
clockPeriod(SimClock::Float::s / freq);
}
+uint32_t
+RealViewTemperatureSensor::read() const
+{
+ // Temperature reported in uC
+ ThermalModel * tm = system->getThermalModel();
+ if (tm) {
+ double t = tm->getTemp();
+ if (t < 0)
+ warn("Temperature below zero!\n");
+ return fmax(0, t) * 1000000;
+ }
+ // Report a dummy 25 degrees temperature
+ return 25000000;
+}
RealViewCtrl *
RealViewCtrlParams::create()
@@ -306,3 +323,9 @@ RealViewOscParams::create()
{
return new RealViewOsc(this);
}
+
+RealViewTemperatureSensor *
+RealViewTemperatureSensorParams::create()
+{
+ return new RealViewTemperatureSensor(this);
+}
diff --git a/src/dev/arm/rv_ctrl.hh b/src/dev/arm/rv_ctrl.hh
index 1a55025a8..b325c4b16 100644
--- a/src/dev/arm/rv_ctrl.hh
+++ b/src/dev/arm/rv_ctrl.hh
@@ -44,6 +44,7 @@
#include "dev/io_device.hh"
#include "params/RealViewCtrl.hh"
#include "params/RealViewOsc.hh"
+#include "params/RealViewTemperatureSensor.hh"
/** @file
* This implements the simple real view registers on a PBXA9
@@ -219,5 +220,32 @@ class RealViewOsc
void clockPeriod(Tick clock_period);
};
+/**
+ * This device implements the temperature sensor used in the
+ * RealView/Versatile Express platform.
+ *
+ * See ARM DUI 0447J (ARM Motherboard Express uATX -- V2M-P1).
+ */
+class RealViewTemperatureSensor
+ : public SimObject, RealViewCtrl::Device
+{
+ public:
+ RealViewTemperatureSensor(RealViewTemperatureSensorParams *p)
+ : SimObject(p),
+ RealViewCtrl::Device(*p->parent, RealViewCtrl::FUNC_TEMP,
+ p->site, p->position, p->dcc, p->device),
+ system(p->system)
+ {}
+ virtual ~RealViewTemperatureSensor() {};
+
+ public: // RealViewCtrl::Device interface
+ uint32_t read() const override;
+ void write(uint32_t temp) override {}
+
+ protected:
+ /** The system this RV device belongs to */
+ System * system;
+};
+
#endif // __DEV_ARM_RV_HH__