/*
- * Copyright (c) 2012 ARM Limited
+ * Copyright (c) 2012-2014, 2019 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * Authors: Vasileios Spiliopoulos
- * Akash Bagdia
*/
+#include "sim/voltage_domain.hh"
+
+#include <algorithm>
+
+#include "base/statistics.hh"
+#include "base/trace.hh"
#include "debug/VoltageDomain.hh"
#include "params/VoltageDomain.hh"
#include "sim/sim_object.hh"
-#include "sim/voltage_domain.hh"
VoltageDomain::VoltageDomain(const Params *p)
- : SimObject(p), _voltage(0)
+ : SimObject(p), voltageOpPoints(p->voltage), _perfLevel(0), stats(*this)
{
- voltage(p->voltage);
+ fatal_if(voltageOpPoints.empty(), "DVFS: Empty set of voltages for "\
+ "voltage domain %s\n", name());
+
+ // Voltages must be sorted in descending order.
+ fatal_if(!std::is_sorted(voltageOpPoints.begin(), voltageOpPoints.end(),
+ std::greater<Voltages::value_type>()), "DVFS: Voltage operation "\
+ "points not in descending order for voltage domain %s\n",
+ name());
}
void
-VoltageDomain::voltage(double voltage)
+VoltageDomain::perfLevel(PerfLevel perf_level)
{
- if (voltage <= 0) {
- fatal("Voltage should be greater than zero.\n");
+ chatty_assert(perf_level < voltageOpPoints.size(),
+ "DVFS: Requested voltage ID %d is outside the known "\
+ "range for domain %s.\n", perf_level, name());
+
+ if (perf_level == _perfLevel) {
+ // Silently ignore identical overwrites
+ return;
}
- _voltage = voltage;
- DPRINTF(VoltageDomain,
- "Setting voltage to %f for domain %s\n", _voltage, name());
+ _perfLevel = perf_level;
+
+ DPRINTF(VoltageDomain, "Setting voltage to %.3fV idx: %d for domain %s\n",
+ voltage(), perf_level, name());
+}
+
+bool
+VoltageDomain::sanitiseVoltages()
+{
+ if (numVoltages() == 1)
+ return false;
+
+ // Find the highest requested performance level and update the voltage
+ // domain with it
+ PerfLevel perf_max = (PerfLevel)-1;
+ for (auto dit = srcClockChildren.begin(); dit != srcClockChildren.end(); ++dit) {
+ SrcClockDomain* d = *dit;
+ chatty_assert(d->voltageDomain() == this, "DVFS: Clock domain %s "\
+ "(id: %d) should not be registered with voltage domain "\
+ "%s\n", d->name(), d->domainID(), name());
+
+ PerfLevel perf = d->perfLevel();
+
+ DPRINTF(VoltageDomain, "DVFS: Clock domain %s (id: %d) requests perf "\
+ "level %d\n", d->name(), d->domainID(), perf);
+
+ // NOTE: Descending sort of performance levels: 0 - fast, 5 - slow
+ if (perf < perf_max) {
+ DPRINTF(VoltageDomain, "DVFS: Updating max perf level %d -> %d\n",
+ perf_max, perf);
+ perf_max = perf;
+ }
+ }
+ DPRINTF(VoltageDomain, "DVFS: Setting perf level of voltage domain %s "\
+ "from %d to %d.\n", name(), perfLevel(), perf_max);
+
+ // Set the performance level
+ if (perf_max != perfLevel()) {
+ perfLevel(perf_max);
+ return true;
+ } else {
+ return false;
+ }
+}
+
+void
+VoltageDomain::startup() {
+ bool changed = sanitiseVoltages();
+ if (changed) {
+ warn("DVFS: Perf level for voltage domain %s adapted to "\
+ "requested perf levels from source clock domains.\n", name());
+ }
}
VoltageDomain *
{
return new VoltageDomain(this);
}
+
+void
+VoltageDomain::serialize(CheckpointOut &cp) const
+{
+ SERIALIZE_SCALAR(_perfLevel);
+}
+
+void
+VoltageDomain::unserialize(CheckpointIn &cp)
+{
+ UNSERIALIZE_SCALAR(_perfLevel);
+ perfLevel(_perfLevel);
+}
+
+VoltageDomain::VoltageDomainStats::VoltageDomainStats(VoltageDomain &vd)
+ : Stats::Group(&vd),
+ ADD_STAT(voltage, "Voltage in Volts")
+{
+ voltage.method(&vd, &VoltageDomain::voltage);
+}