diff options
Diffstat (limited to 'src/sim/voltage_domain.hh')
-rw-r--r-- | src/sim/voltage_domain.hh | 82 |
1 files changed, 67 insertions, 15 deletions
diff --git a/src/sim/voltage_domain.hh b/src/sim/voltage_domain.hh index b2f6715cf..3904c80c9 100644 --- a/src/sim/voltage_domain.hh +++ b/src/sim/voltage_domain.hh @@ -41,8 +41,11 @@ #ifndef __SIM_VOLTAGE_DOMAIN_HH__ #define __SIM_VOLTAGE_DOMAIN_HH__ +#include <vector> + #include "base/statistics.hh" #include "params/VoltageDomain.hh" +#include "sim/clock_domain.hh" #include "sim/sim_object.hh" /** @@ -52,40 +55,89 @@ */ class VoltageDomain : public SimObject { + public: - private: + typedef VoltageDomainParams Params; + VoltageDomain(const Params *p); /** - * The voltage of the domain expressed in Volts + * Get the current voltage. + * + * @return Voltage of the domain */ - double _voltage; + double voltage() const { return voltageOpPoints[_perfLevel]; } + + uint32_t numVoltages() const { return (uint32_t)voltageOpPoints.size(); } + + typedef SrcClockDomain::PerfLevel PerfLevel; /** - * Stat for reporting voltage of the domain + * Set the voltage point of the domain. + * @param Voltage value to be set */ - Stats::Value currentVoltage; + void perfLevel(PerfLevel perf_level); - public: + /** + * Get the voltage point of the domain. + * @param Voltage value to be set + */ + PerfLevel perfLevel() const { return _perfLevel; } - typedef VoltageDomainParams Params; - VoltageDomain(const Params *p); + /** + * Register a SrcClockDomain with this voltage domain. + * @param src_clock_domain The SrcClockDomain to register. + */ + void registerSrcClockDom(SrcClockDomain *src_clock_dom) { + assert(src_clock_dom->voltageDomain() == this); + srcClockChildren.push_back(src_clock_dom); + } /** - * Get the current volate. - * - * @return Voltage of the domain + * Startup has all SrcClockDomains registered with this voltage domain, so + * try to make sure that all perf level requests from them are met. */ - inline double voltage() const { return _voltage; } + void startup(); /** - * Set the voltage of the domain. + * Recomputes the highest (fastest, i.e., numerically lowest) requested + * performance level of all associated clock domains, and updates the + * performance level of this voltage domain to match. This means that for + * two connected clock domains, one fast and one slow, the voltage domain + * will provide the voltage associated with the fast DVFS operation point. + * Must be called whenever a clock domain decides to swtich its performance + * level. * - * @param Voltage value to be set + * @return True, if the voltage was actually changed. */ - void voltage(double voltage); + bool sanitiseVoltages(); void regStats(); + void serialize(std::ostream &os); + void unserialize(Checkpoint *cp, const std::string §ion); + private: + typedef std::vector<double> Voltages; + /** + * List of possible minimum voltage at each of the frequency operational + * points, should be in descending order and same size as freqOpPoints. + * An empty list corresponds to default voltage specified for the voltage + * domain its clock domain belongs. The same voltage is applied for each + * freqOpPoints, overall implying NO DVS + */ + const Voltages voltageOpPoints; + PerfLevel _perfLevel; + + /** + * Stat for reporting voltage of the domain + */ + Stats::Value currentVoltage; + + /** + * List of associated SrcClockDomains that are connected to this voltage + * domain. + */ + typedef std::vector<SrcClockDomain *> SrcClockChildren; + SrcClockChildren srcClockChildren; }; #endif |