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base: High-level interface for hardware performance counters.

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Michael Mueller
2023-03-27 17:00:58 +02:00
parent e5c8167992
commit b9e1da2ad1
2 changed files with 180 additions and 0 deletions
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87
repos/base-nova/src/lib/base/perf.cc Normal file
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/*
* \brief Performance Counter infrastructure, NOVA-specific implemantation
* \author Michael Müller
* \date 2022-12-15
*/
#include <base/trace/perf.h>
#include <nova/syscall-generic.h>
#include <nova/syscalls.h>
#include <base/log.h>
unsigned long Genode::Trace::Performance_counter::private_freemask { 0xffff };
unsigned long Genode::Trace::Performance_counter::shared_freemask { 0xffff0000 };
void Genode::Trace::Performance_counter::_init_masks()
{
Nova::Hip::Cpu_desc::Vendor vendor = Nova::Hip::Cpu_desc::AMD;
if (vendor == Nova::Hip::Cpu_desc::AMD)
{
private_freemask = 0x3f; // 6 core performance counters
shared_freemask = 0x1f0000; // 5 L3 complex performance counters
}
else if (vendor == Nova::Hip::Cpu_desc::INTEL)
{
private_freemask = 0x7fff;
shared_freemask = 0x7fff0000; // 15 CBO performance counters
}
}
void Genode::Trace::Performance_counter::setup(unsigned counter, uint64_t event, uint64_t mask, uint64_t flags)
{
Nova::mword_t evt = event;
Nova::mword_t msk = mask;
Nova::mword_t flg = flags;
Nova::uint8_t rc;
Nova::mword_t type = (counter >>4);
Nova::mword_t sel = type == Performance_counter::CORE ? counter : counter & 0xf;
if ((rc = (Nova::hpc_ctrl(Nova::HPC_SETUP, sel, type, evt, msk, flg))) != Nova::NOVA_OK)
throw Genode::Trace::Pfc_access_error(rc);
}
void Genode::Trace::Performance_counter::start(unsigned counter)
{
Nova::uint8_t rc;
Nova::mword_t type = (counter >> 4);
Nova::mword_t sel = type == Performance_counter::CORE ? counter : counter >>4;
if ((rc = Nova::hpc_start(sel, type)) != Nova::NOVA_OK)
throw Genode::Trace::Pfc_access_error(rc);
}
void Genode::Trace::Performance_counter::stop(unsigned counter)
{
Nova::uint8_t rc;
Nova::mword_t type = (counter >>4);
Nova::mword_t sel = type == Performance_counter::CORE ? counter : counter & 0xf;
if ((rc = Nova::hpc_stop(sel, type)) != Nova::NOVA_OK)
throw Genode::Trace::Pfc_access_error(rc);
}
void Genode::Trace::Performance_counter::reset(unsigned counter, unsigned val)
{
Nova::uint8_t rc;
Nova::mword_t type = (counter >>4);
Nova::mword_t sel = type == Performance_counter::CORE ? counter : counter & 0xf;
if ((rc = Nova::hpc_reset(sel, type, val)) != Nova::NOVA_OK)
throw Genode::Trace::Pfc_access_error(rc);
}
Genode::uint64_t Genode::Trace::Performance_counter::read(unsigned counter)
{
Nova::uint8_t rc;
Nova::mword_t value = 0;
Nova::mword_t type = (counter >>4);
Nova::mword_t sel = type == Performance_counter::CORE ? counter : counter & 0xf;
if ((rc = Nova::hpc_read(sel, type, value)) != Nova::NOVA_OK)
throw Genode::Trace::Pfc_access_error(rc);
Genode::log("Performance_counter::read = ", value);
return static_cast<Genode::uint64_t>(value);
}