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Re-enable TSC on ryzen CPUs

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kd-11 2025-02-02 15:56:09 +03:00 • committed by kd-11
parent 89eb473dce
commit cfd571cfc2
1 changed files with 45 additions and 5 deletions
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50
rpcs3/util/sysinfo.cpp
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@ -23,6 +23,7 @@
#endif
#include <thread>
#include <fstream>
#include "util/asm.hpp"
#include "util/fence.hpp"
@ -776,11 +777,6 @@ static const bool s_tsc_freq_evaluated = []() -> bool
return 0;
}
if (utils::get_cpu_brand().find("Ryzen") != umax)
{
return 0;
}
#ifdef _WIN32
LARGE_INTEGER freq;
if (!QueryPerformanceFrequency(&freq))
@ -795,6 +791,50 @@ static const bool s_tsc_freq_evaluated = []() -> bool
const ullong timer_freq = freq.QuadPart;
#else
#ifdef __linux__
// Check if system clocksource is TSC. If the kernel trusts the TSC, we should too.
// Some Ryzen laptops have broken firmware when running linux (requires a kernel patch). This is also a problem on some older intel CPUs.
const char* clocksource_file = "/sys/devices/system/clocksource/clocksource0/available_clocksource";
if (!fs::is_file(clocksource_file))
{
// OS doesn't support sysfs?
printf("[TSC calibration] Could not determine available clock sources. Disabling TSC.\n");
return 0;
}
std::string clock_sources;
std::ifstream file(clocksource_file);
std::getline(file, clock_sources);
if (file.fail())
{
printf("[TSC calibration] Could not read the available clock sources on this system. Disabling TSC.\n");
return 0;
}
printf("[TSC calibration] Available clock sources: '%s'\n", clock_sources.c_str());
// Check if the Kernel has blacklisted the TSC
const auto available_clocks = fmt::split(clock_sources, { " " });
const bool tsc_reliable = std::find(available_clocks.begin(), available_clocks.end(), "tsc") != available_clocks.end();
if (!tsc_reliable)
{
printf("[TSC calibration] TSC is not a supported clock source on this system.\n");
return 0;
}
printf("[TSC calibration] Kernel reports the TSC is reliable.\n");
#else
if (utils::get_cpu_brand().find("Ryzen") != umax)
{
// MacOS is arm-native these days and I don't know much about BSD to fix this if it's an issue. (kd-11)
// Having this check only for Ryzen is broken behavior - other CPUs can also have this problem.
return 0;
}
#endif
constexpr ullong timer_freq = 1'000'000'000;
#endif