111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
/*
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* Copyright (C) 2021-2023 Intel Corporation
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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#include "shared/source/os_interface/linux/pmt_util.h"
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#include "shared/source/os_interface/linux/file_descriptor.h"
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#include "shared/source/os_interface/linux/sys_calls.h"
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#include "shared/source/utilities/directory.h"
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#include <climits>
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#include <algorithm>
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#include <array>
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#include <cstdint>
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#include <fcntl.h>
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#include <map>
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#include <sstream>
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#include <string_view>
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namespace NEO {
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void PmtUtil::getTelemNodesInPciPath(std::string_view rootPciPath, std::map<uint32_t, std::string> &telemPciPath) {
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// if bdf = 0000:3a:00.0
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// link = "../../devices/pci0000:37/0000:37:01.0/0000:38:00.0/0000:39:01.0/0000:3a:00.0/drm/renderD128/",
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// then root path = "/pci0000:37/0000:37:01.0"
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auto telemNodeList = Directory::getFiles("/sys/class/intel_pmt");
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std::string_view telemDirString("/sys/class/intel_pmt/telem");
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telemPciPath.clear();
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// Get the telem nodes under the same root pci path
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for (auto &telemNode : telemNodeList) {
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char symlink[256] = {'\0'};
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std::size_t pos = telemNode.find(telemDirString);
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if (pos != std::string::npos) {
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pos += telemDirString.length();
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int len = SysCalls::readlink(telemNode.c_str(), symlink, sizeof(symlink) - 1);
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if (len != -1) {
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symlink[len] = '\0';
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std::string_view symlinkString(symlink);
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if (symlinkString.find(rootPciPath.data()) != std::string::npos) {
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int index = std::stoi(telemNode.substr(pos));
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telemPciPath[index] = telemNode;
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}
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}
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}
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}
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}
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bool PmtUtil::readGuid(std::string_view telemDir, std::array<char, PmtUtil::guidStringSize> &guidString) {
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std::ostringstream guidFilename;
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guidFilename << telemDir << "/guid";
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auto fd = FileDescriptor(guidFilename.str().c_str(), O_RDONLY);
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ssize_t bytesRead = 0;
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if (fd > 0) {
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guidString.fill('\0');
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bytesRead = SysCalls::pread(fd, guidString.data(), guidString.size() - 1, 0);
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}
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if (bytesRead <= 0) {
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return false;
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}
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std::replace(guidString.begin(), guidString.end(), '\n', '\0');
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return true;
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}
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bool PmtUtil::readOffset(std::string_view telemDir, uint64_t &offset) {
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std::ostringstream offsetFilename;
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offsetFilename << telemDir << "/offset";
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auto fd = FileDescriptor(offsetFilename.str().c_str(), O_RDONLY);
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ssize_t bytesRead = 0;
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std::array<char, 16> offsetString = {'\0'};
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if (fd > 0) {
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offset = ULONG_MAX;
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bytesRead = SysCalls::pread(fd, offsetString.data(), offsetString.size() - 1, 0);
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}
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if (bytesRead <= 0) {
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return false;
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}
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std::replace(offsetString.begin(), offsetString.end(), '\n', '\0');
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offset = std::strtoul(offsetString.data(), nullptr, 10);
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if (offset == ULONG_MAX) {
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return false;
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}
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return true;
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}
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ssize_t PmtUtil::readTelem(std::string_view telemDir, const std::size_t count, const uint64_t offset, void *data) {
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if (data == nullptr) {
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return 0;
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}
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ssize_t bytesRead = 0;
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std::ostringstream telemFilename;
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telemFilename << telemDir << "/telem";
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auto fd = FileDescriptor(telemFilename.str().c_str(), O_RDONLY);
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if (fd > 0) {
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bytesRead = SysCalls::pread(fd, data, count, static_cast<off_t>(offset));
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}
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return bytesRead;
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}
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} // namespace NEO
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