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28fa434541
Some OpenCL application need to render libva surface with drm display and use the same libva surface as OpenCL kernel output. Such applicatoins need to use /dev/dri/card0 instead of /dev/dri/renderD128 for getting the display fd. Related-To: NEO-11714 Signed-off-by: Elaine, Wang <elaine.wang@intel.com>
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
/*
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* Copyright (C) 2021-2024 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/pci_path.h"
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#include "shared/source/os_interface/linux/sys_calls.h"
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#include <cstdint>
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#include <string_view>
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#include <unistd.h>
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namespace NEO {
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std::optional<std::string> getPciLinkPath(int deviceFd) {
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char path[256] = {0};
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size_t pathlen = 256;
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if (SysCalls::getDevicePath(deviceFd, path, pathlen)) {
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return std::nullopt;
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}
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if (SysCalls::access(path, F_OK)) {
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return std::nullopt;
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}
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int readLinkSize = 0;
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char devicePath[256] = {0};
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size_t devicePathLength = 256;
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readLinkSize = SysCalls::readlink(path, devicePath, devicePathLength);
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if (readLinkSize == -1) {
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return std::nullopt;
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}
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return std::string(devicePath, static_cast<size_t>(readLinkSize));
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}
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std::optional<std::string> getPciPath(int deviceFd) {
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auto deviceLinkPath = NEO::getPciLinkPath(deviceFd);
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if (deviceLinkPath == std::nullopt) {
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return std::nullopt;
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}
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auto pciPathPos = deviceLinkPath->find("/drm/render");
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if (pciPathPos == std::string::npos) {
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pciPathPos = deviceLinkPath->find("/drm/card");
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}
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if (pciPathPos == std::string::npos || pciPathPos < 12) {
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return std::nullopt;
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}
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return deviceLinkPath->substr(pciPathPos - 12u, 12u);
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}
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std::optional<std::string> getPciRootPath(int deviceFd) {
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auto pciLinkPath = NEO::getPciLinkPath(deviceFd);
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// pciLinkPath = "../../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 = "/pci0000:37/0000:37:01.0/0000:38:00.0/"
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if (pciLinkPath == std::nullopt) {
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return std::nullopt;
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}
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auto startPos = pciLinkPath->find("/pci");
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if (startPos == std::string::npos) {
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return std::nullopt;
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}
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// Root PCI path is at 2 levels up from drm/renderD128
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uint32_t rootPciDepth = 4;
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auto endPos = std::string::npos;
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while (rootPciDepth--) {
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endPos = pciLinkPath->rfind('/', endPos - 1);
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if (endPos == std::string::npos) {
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return std::nullopt;
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}
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}
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return pciLinkPath->substr(startPos, endPos - startPos);
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}
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} // namespace NEO
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