mirror of
https://github.com/FEX-Emu/FEX.git
synced 2026-10-07 13:00:15 +02:00
Ryan Houdek
bb4e81aa19
Allows a nice way to get information about how TSO emulation is occuring on the individual's hardware. In particular, the more subtle details around the implementation rather than just a hard on or off toggle.
235 lines
8.3 KiB
C++
235 lines
8.3 KiB
C++
// SPDX-License-Identifier: MIT
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#include "ConfigDefines.h"
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#include "Common/cpp-optparse/OptionParser.h"
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#include "Common/Config.h"
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#include "Common/FEXServerClient.h"
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#include "FEXHeaderUtils/Filesystem.h"
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#include "git_version.h"
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#include <FEXCore/Config/Config.h>
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#include <FEXCore/fextl/fmt.h>
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#include <FEXCore/fextl/string.h>
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#include <FEXHeaderUtils/Filesystem.h>
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#include <stdio.h>
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#include <string>
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#include <sys/prctl.h>
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namespace {
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struct TSOEmulationFacts {
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bool LSE {}, LSE2 {};
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bool HardwareTSO {};
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bool LRCPC1 {}, LRCPC2 {}, LRCPC3 {};
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};
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#ifdef _M_ARM_64
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bool CheckForHardwareTSO() {
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// We need to check if these are defined or not. This is a very fresh feature.
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#ifndef PR_GET_MEM_MODEL
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#define PR_GET_MEM_MODEL 0x6d4d444c
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#endif
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#ifndef PR_SET_MEM_MODEL
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#define PR_SET_MEM_MODEL 0x4d4d444c
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#endif
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#ifndef PR_SET_MEM_MODEL_DEFAULT
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#define PR_SET_MEM_MODEL_DEFAULT 0
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#endif
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#ifndef PR_SET_MEM_MODEL_TSO
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#define PR_SET_MEM_MODEL_TSO 1
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#endif
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// Check to see if this is supported.
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auto Result = prctl(PR_GET_MEM_MODEL, 0, 0, 0, 0);
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if (Result == -1) {
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// Unsupported, early exit.
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return false;
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}
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if (Result == PR_SET_MEM_MODEL_DEFAULT) {
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// Try to set the TSO mode if we are currently default.
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Result = prctl(PR_SET_MEM_MODEL, PR_SET_MEM_MODEL_TSO, 0, 0, 0);
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if (Result == 0) {
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Result = prctl(PR_SET_MEM_MODEL, PR_SET_MEM_MODEL_DEFAULT, 0, 0, 0);
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return true;
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}
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}
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return false;
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}
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enum ISAR0_FIELDS {
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LSE = 20,
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};
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enum ISAR1_FIELDS {
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LRCPC = 20,
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};
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enum MMFR2_FIELDS {
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AT = 32,
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};
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constexpr static uint32_t IDFIELDMASK = 0b1111;
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uint64_t GetISAR0() {
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uint64_t Result {};
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asm("mrs %0, ID_AA64ISAR0_EL1;" : "=r"(Result));
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return Result;
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}
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uint64_t GetISAR1() {
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uint64_t Result {};
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asm("mrs %0, ID_AA64ISAR1_EL1;" : "=r"(Result));
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return Result;
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}
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uint64_t GetMMFR2() {
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uint64_t Result {};
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asm("mrs %0, ID_AA64MMFR2_EL1;" : "=r"(Result));
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return Result;
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}
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TSOEmulationFacts GetTSOEmulationFacts() {
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const auto ISAR0 = GetISAR0();
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const auto ISAR1 = GetISAR1();
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const auto MMFR2 = GetMMFR2();
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return {
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.LSE = ((ISAR0 >> ISAR0_FIELDS::LSE) & IDFIELDMASK) >= 0b0010,
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.LSE2 = ((MMFR2 >> MMFR2_FIELDS::AT) & IDFIELDMASK) >= 0b0001,
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.HardwareTSO = CheckForHardwareTSO(),
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.LRCPC1 = ((ISAR1 >> ISAR1_FIELDS::LRCPC) & IDFIELDMASK) >= 0b0001,
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.LRCPC2 = ((ISAR1 >> ISAR1_FIELDS::LRCPC) & IDFIELDMASK) >= 0b0010,
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.LRCPC3 = ((ISAR1 >> ISAR1_FIELDS::LRCPC) & IDFIELDMASK) >= 0b0011,
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};
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}
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#else
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TSOEmulationFacts GetTSOEmulationFacts() {
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return {};
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}
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#endif
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} // namespace
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int main(int argc, char** argv, char** envp) {
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FEXCore::Config::Initialize();
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FEXCore::Config::AddLayer(FEX::Config::CreateGlobalMainLayer());
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FEXCore::Config::AddLayer(FEX::Config::CreateMainLayer());
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// No FEX arguments passed through command line
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FEXCore::Config::AddLayer(FEX::Config::CreateEnvironmentLayer(envp));
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FEXCore::Config::Load();
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// Load the arguments
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optparse::OptionParser Parser = optparse::OptionParser().description("Simple application to get a couple of FEX options");
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Parser.add_option("--install-prefix").action("store_true").help("Print the FEX install prefix");
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Parser.add_option("--app").help("Load an application profile for this application if it exists");
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Parser.add_option("--current-rootfs").action("store_true").help("Print the directory that contains the FEX rootfs. Mounted in the case of squashfs");
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Parser.add_option("--tso-emulation-info").action("store_true").help("Print how FEX is emulating the x86-TSO memory model.");
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Parser.add_option("--version").action("store_true").help("Print the installed FEX-Emu version");
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optparse::Values Options = Parser.parse_args(argc, argv);
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if (Options.is_set_by_user("app")) {
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// Load the application config if one was provided
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const auto ProgramName = FHU::Filesystem::GetFilename(Options["app"]);
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FEXCore::Config::AddLayer(FEX::Config::CreateAppLayer(ProgramName, FEXCore::Config::LayerType::LAYER_GLOBAL_APP));
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FEXCore::Config::AddLayer(FEX::Config::CreateAppLayer(ProgramName, FEXCore::Config::LayerType::LAYER_LOCAL_APP));
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auto SteamID = getenv("SteamAppId");
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if (SteamID) {
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// If a SteamID exists then let's search for Steam application configs as well.
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// We want to key off both the SteamAppId number /and/ the executable since we may not want to thunk all binaries.
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const auto SteamAppName = fextl::fmt::format("Steam_{}_{}", SteamID, ProgramName);
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FEXCore::Config::AddLayer(FEX::Config::CreateAppLayer(SteamAppName, FEXCore::Config::LayerType::LAYER_GLOBAL_STEAM_APP));
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FEXCore::Config::AddLayer(FEX::Config::CreateAppLayer(SteamAppName, FEXCore::Config::LayerType::LAYER_LOCAL_STEAM_APP));
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}
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}
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// Reload the meta layer
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FEXCore::Config::ReloadMetaLayer();
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if (Options.is_set_by_user("version")) {
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fprintf(stdout, GIT_DESCRIBE_STRING "\n");
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}
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if (Options.is_set_by_user("install_prefix")) {
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fprintf(stdout, FEX_INSTALL_PREFIX "\n");
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}
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if (Options.is_set_by_user("current_rootfs")) {
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int ServerFD = FEXServerClient::ConnectToServer();
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if (ServerFD != -1) {
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auto RootFS = FEXServerClient::RequestRootFSPath(ServerFD);
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if (!RootFS.empty()) {
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fprintf(stdout, "%s\n", RootFS.c_str());
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}
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}
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}
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if (Options.is_set_by_user("tso_emulation_info")) {
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auto TSOFacts = GetTSOEmulationFacts();
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const char* GPRMemoryTSOEmulation {};
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const char* MemcpyMemoryTSOEmulation {};
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const char* VectorMemoryTSOEmulation {};
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const char* UnalignedMemoryLoadStoreTSOEmulation {};
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if (TSOFacts.HardwareTSO) {
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GPRMemoryTSOEmulation = "\e[32mHardware TSO\e[0m";
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} else if (TSOFacts.LRCPC3) {
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GPRMemoryTSOEmulation = "\e[32mLRCPC3\e[0m";
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} else if (TSOFacts.LRCPC2) {
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GPRMemoryTSOEmulation = "\e[32mLRCPC2\e[0m";
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} else if (TSOFacts.LRCPC1) {
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GPRMemoryTSOEmulation = "\e[32mLRCPC\e[0m";
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} else {
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GPRMemoryTSOEmulation = "\e[31mAtomics\e[0m";
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}
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// Memcpy only uses Hardware TSO, LRCPC, and Atomics.
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if (TSOFacts.HardwareTSO) {
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MemcpyMemoryTSOEmulation = "\e[32mHardware TSO\e[0m";
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} else if (TSOFacts.LRCPC1) {
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MemcpyMemoryTSOEmulation = "\e[32mLRCPC\e[0m";
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} else {
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MemcpyMemoryTSOEmulation = "\e[31mAtomics\e[0m";
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}
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if (TSOFacts.HardwareTSO) {
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VectorMemoryTSOEmulation = "\e[32mHardware TSO\e[0m";
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} else if (TSOFacts.LRCPC3) {
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VectorMemoryTSOEmulation = "\e[32mLRCPC3\e[0m";
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} else {
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VectorMemoryTSOEmulation = "\e[31mHalf-Barriers\e[0m";
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}
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if (TSOFacts.HardwareTSO) {
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UnalignedMemoryLoadStoreTSOEmulation = "\e[32mHardware TSO\e[0m";
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} else {
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UnalignedMemoryLoadStoreTSOEmulation = "\e[31mHalf-Barriers\e[0m";
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}
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fprintf(stdout, "Hardware Features:\n");
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fprintf(stdout, "\tMemory atomics emulation method: %s\n", TSOFacts.LSE ? "\e[32mLSE\e[0m" : "\e[31mLL/SC\e[0m");
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fprintf(stdout, "\tUnaligned atomic memory granularity: %s\n", TSOFacts.LSE2 ? "\e[32m16-byte\e[0m" : "\e[31mNatural alignment\e[0m");
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///< TODO: Once TME is supported by hardware this can change.
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fprintf(stdout, "\tUnaligned memory atomic emulation: %s\n", TSOFacts.LSE ? "\e[31mTearing CAS loops\e[0m" : "\e[31mTearing LL/SC loops\e[0m");
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fprintf(stdout, "\tUnaligned memory loadstore emulation: %s\n", UnalignedMemoryLoadStoreTSOEmulation);
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fprintf(stdout, "\tGPR memory model emulation: %s\n", GPRMemoryTSOEmulation);
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fprintf(stdout, "\tMemcpy memory model emulation: %s\n", MemcpyMemoryTSOEmulation);
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fprintf(stdout, "\tVector memory model emulation: %s\n", VectorMemoryTSOEmulation);
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FEX_CONFIG_OPT(TSOEnabled, TSOENABLED);
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FEX_CONFIG_OPT(MemcpySetTSOEnabled, MEMCPYSETTSOENABLED);
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FEX_CONFIG_OPT(VectorTSOEnabled, VECTORTSOENABLED);
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FEX_CONFIG_OPT(HalfBarrierTSOEnabled, HALFBARRIERTSOENABLED);
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fprintf(stdout, "\nConfiguration:\n");
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fprintf(stdout, "\tTSO Emulation: %s\n", TSOEnabled() ? "Enabled" : "Disabled");
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fprintf(stdout, "\tMemcpy TSO Emulation: %s\n", TSOEnabled() && MemcpySetTSOEnabled() ? "Enabled" : "Disabled");
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fprintf(stdout, "\tVector TSO Emulation: %s\n", TSOEnabled() && VectorTSOEnabled() ? "Enabled" : "Disabled");
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fprintf(stdout, "\tHalf-barrier unaligned TSO emulation: %s\n", TSOEnabled() && HalfBarrierTSOEnabled() ? "Enabled" : "Disabled");
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}
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return 0;
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}
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