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/*
* SPDX-FileCopyrightText: 2021 David Redondo <kde@david-redondo.de>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#include <algorithm>
#include <array>
#include <cstdint>
#include <cstring>
#include <filesystem>
#include <fstream>
#include <functional>
#include <iostream>
#include <map>
#include <string>
#include <string_view>
#include <vector>
#include <libdrm/i915_drm.h>
#include <linux/perf_event.h>
#include <sys/ioctl.h>
#include <sys/syscall.h>
#include <unistd.h>
constexpr auto igpuPciId = "0000:00:02.0";
struct engine_info {
drm_i915_gem_engine_class type;
std::uint64_t config;
};
int perf_open(int type, int config, int group_fd)
{
perf_event_attr pe;
std::memset(&pe, 0, sizeof(pe));
pe.type = type;
pe.size = sizeof(pe);
pe.config = config;
pe.read_format = PERF_FORMAT_GROUP | PERF_FORMAT_ID | PERF_FORMAT_TOTAL_TIME_ENABLED;
return syscall(SYS_perf_event_open, &pe, -1, 0, group_fd, PERF_FLAG_FD_CLOEXEC);
}
std::vector<engine_info> discoverEngines(const std::filesystem::path &deviceDir)
{
std::vector<engine_info> engines;
for (const auto &entry : std::filesystem::directory_iterator(deviceDir / "events", std::filesystem::directory_options::skip_permission_denied)) {
if (!entry.is_regular_file() || !entry.path().string().ends_with("busy")) {
continue;
}
std::ifstream configFile(entry.path());
if (!configFile.is_open()) {
std::cerr << "Could not open " << entry.path() << '\n';
continue;
}
std::string contents;
if (!std::getline(configFile, contents)) {
std::cerr << "Could not read " << entry.path() << '\n';
continue;
}
if (!contents.starts_with("config=")) {
std::cerr << entry.path() << ": Expected 'config=' got " << contents << '\n';
continue;
}
const std::uint64_t config = std::strtol(&contents.at(strlen("config=")), nullptr, 0);
if (errno != 0) {
std::cerr << entry.path() << ": Failed parsing" << contents << '\n';
continue;
}
// Reverse of I915_PMU_ENGINE_BUSY macro
if ((config & I915_PMU_SAMPLE_MASK) != I915_SAMPLE_BUSY) {
std::cerr << entry.path() << ": Config is not a busy sample" << config << '\n';
continue;
}
const int type = config >> I915_PMU_CLASS_SHIFT;
if (type != I915_ENGINE_CLASS_RENDER && type != I915_ENGINE_CLASS_COPY && type != I915_ENGINE_CLASS_VIDEO
&& type != I915_ENGINE_CLASS_VIDEO_ENHANCE) {
std::cerr << entry.path() << ": " << type << " is not an engine class \n";
continue;
}
engines.push_back({static_cast<drm_i915_gem_engine_class>(type), config});
}
return engines;
}
int readType(const std::filesystem::path &deviceDir)
{
const auto filePath = deviceDir / "type";
std::ifstream typeFile(filePath);
if (!typeFile.is_open()) {
std::cerr << "Could not open " << filePath << '\n';
std::exit(1);
}
int type = -1;
if (!(typeFile >> type)) {
std::cerr << "Error reading type from " << filePath << '\n';
std::exit(1);
}
return type;
}
std::filesystem::path deviceDirectory(std::string_view pciId)
{
// fileName is i915_xxxx_yy_zz.z where pci address is xxxx:yy:zz.z
// No pci address in filename is integrated GPU with address of "0000:00:02.0"
// see intel-gpu-top https://gitlab.freedesktop.org/drm/igt-gpu-tools/-/blob/17707095f1e5d3c30f463b43022f01c0160579b6/tools/intel_gpu_top.c?page=3#L2291
constexpr auto dirPrefix = "/sys/bus/event_source/devices/i915";
if (pciId == igpuPciId) {
return dirPrefix;
}
std::string pciSuffix(pciId);
std::replace(pciSuffix.begin(), pciSuffix.end(), ':', '_');
return dirPrefix + pciSuffix;
}
int main(int argc, char **argv)
{
const char *requestedDevice = argc > 1 ? argv[1] : igpuPciId;
const auto deviceDir = deviceDirectory(requestedDevice);
if (!(std::filesystem::exists(deviceDir) && std::filesystem::is_directory(deviceDir))) {
std::cerr << "Device directory " << deviceDir << " does not exist\n";
exit(1);
}
const int perfType = readType(deviceDir);
const auto engines = discoverEngines(deviceDir);
std::array<size_t, 4> enginesPerClass{};
for (const auto &engine : engines) {
++enginesPerClass[engine.type];
}
std::vector<std::uint64_t> events;
events.reserve(engines.size() + 2);
std::ranges::transform(engines, std::back_inserter(events), std::mem_fn(&engine_info::config));
events.insert(events.end(), {I915_PMU_ACTUAL_FREQUENCY, I915_PMU_INTERRUPTS});
int group_fd = -1;
std::map<std::uint64_t, uint64_t> idToEvent;
for (const auto event : events) {
const int fd = perf_open(perfType, event, group_fd);
if (group_fd == -1) {
group_fd = fd;
}
if (fd != -1) {
std::uint64_t id;
ioctl(fd, PERF_EVENT_IOC_ID, &id);
idToEvent.emplace(id, event);
}
}
if (group_fd == -1) {
std::cerr << "Failed opening any event" << std::endl;
return -1;
}
struct read_format {
std::uint64_t count;
std::uint64_t time_enabled;
struct value {
std::uint64_t value;
std::uint64_t id;
} values[];
};
const size_t neededSize = sizeof(read_format) + sizeof(read_format::value) * idToEvent.size();
read_format *data = static_cast<read_format *>(operator new(neededSize));
std::array<std::uint64_t, 4> engineCounters;
while (true) {
if (read(group_fd, data, neededSize) < 0) {
std::cerr << "Error reading events" << std::endl;
return errno;
}
engineCounters = {};
std::cout << data->time_enabled;
for (std::uint64_t i = 0; i < data->count; ++i) {
const auto event = idToEvent.find(data->values[i].id);
if (event == idToEvent.end()) {
std::cerr << "Unknown event id" << data->values[i].id << "\n";
continue;
}
switch (event->second) {
case I915_PMU_INTERRUPTS:
std::cout << "|Interrupts|" << data->values[i].value;
break;
case I915_PMU_ACTUAL_FREQUENCY:
std::cout << "|Frequency|" << data->values[i].value;
break;
default: {
engineCounters[event->second >> I915_PMU_CLASS_SHIFT] += data->values[i].value;
}
}
}
std::cout << "|Render|" << engineCounters[I915_ENGINE_CLASS_RENDER] / enginesPerClass[I915_ENGINE_CLASS_RENDER];
std::cout << "|Copy|" << engineCounters[I915_ENGINE_CLASS_COPY] / enginesPerClass[I915_ENGINE_CLASS_COPY];
std::cout << "|Video|" << engineCounters[I915_ENGINE_CLASS_VIDEO] / enginesPerClass[I915_ENGINE_CLASS_VIDEO];
std::cout << "|Enhance|" << engineCounters[I915_ENGINE_CLASS_VIDEO_ENHANCE] / enginesPerClass[I915_ENGINE_CLASS_VIDEO_ENHANCE];
std::cout << std::endl;
sleep(1);
}
}
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