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/*
* Copyright (C) 2021-2024 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/os_interface/linux/pci_path.h"
#include "shared/source/os_interface/linux/sys_calls.h"
#include <cstdint>
#include <string_view>
#include <unistd.h>
namespace NEO {
std::optional<std::string> getPciLinkPath(int deviceFd) {
char path[256] = {0};
size_t pathlen = 256;
if (SysCalls::getDevicePath(deviceFd, path, pathlen)) {
return std::nullopt;
}
if (SysCalls::access(path, F_OK)) {
return std::nullopt;
}
int readLinkSize = 0;
char devicePath[256] = {0};
size_t devicePathLength = 256;
readLinkSize = SysCalls::readlink(path, devicePath, devicePathLength);
if (readLinkSize == -1) {
return std::nullopt;
}
return std::string(devicePath, static_cast<size_t>(readLinkSize));
}
std::optional<std::string> getPciPath(int deviceFd) {
auto deviceLinkPath = NEO::getPciLinkPath(deviceFd);
if (deviceLinkPath == std::nullopt) {
return std::nullopt;
}
auto pciPathPos = deviceLinkPath->find("/drm/render");
if (pciPathPos == std::string::npos) {
pciPathPos = deviceLinkPath->find("/drm/card");
}
if (pciPathPos == std::string::npos || pciPathPos < 12) {
return std::nullopt;
}
return deviceLinkPath->substr(pciPathPos - 12u, 12u);
}
std::optional<std::string> getPciRootPath(int deviceFd) {
auto pciLinkPath = NEO::getPciLinkPath(deviceFd);
// pciLinkPath = "../../devices/pci0000:37/0000:37:01.0/0000:38:00.0/0000:39:01.0/0000:3a:00.0/drm/renderD128/",
// Then root path = "/pci0000:37/0000:37:01.0/0000:38:00.0/"
if (pciLinkPath == std::nullopt) {
return std::nullopt;
}
auto startPos = pciLinkPath->find("/pci");
if (startPos == std::string::npos) {
return std::nullopt;
}
// Root PCI path is at 2 levels up from drm/renderD128
uint32_t rootPciDepth = 4;
auto endPos = std::string::npos;
while (rootPciDepth--) {
endPos = pciLinkPath->rfind('/', endPos - 1);
if (endPos == std::string::npos) {
return std::nullopt;
}
}
return pciLinkPath->substr(startPos, endPos - startPos);
}
} // namespace NEO
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