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/*
* Copyright (C) 2025-2026 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#include "shared/source/os_interface/linux/external_semaphore_linux.h"
#include "shared/source/os_interface/external_semaphore.h"
#include "shared/source/os_interface/linux/drm_neo.h"
#include "shared/source/os_interface/linux/drm_wrappers.h"
#include "shared/source/os_interface/linux/ioctl_helper.h"
#include "shared/source/os_interface/linux/sys_calls.h"
namespace NEO {
std::unique_ptr<ExternalSemaphore> ExternalSemaphore::create(OSInterface *osInterface, ExternalSemaphore::Type type, void *handle, int fd, const char *name) {
if (!osInterface) {
return nullptr;
}
auto externalSemaphore = ExternalSemaphoreLinux::create(osInterface);
bool result = externalSemaphore->importSemaphore(nullptr, fd, 0, nullptr, type, false);
if (result == false) {
return nullptr;
}
return externalSemaphore;
}
std::unique_ptr<ExternalSemaphoreLinux> ExternalSemaphoreLinux::create(OSInterface *osInterface) {
auto externalSemaphoreLinux = std::make_unique<ExternalSemaphoreLinux>();
externalSemaphoreLinux->osInterface = osInterface;
externalSemaphoreLinux->state = SemaphoreState::Initial;
return externalSemaphoreLinux;
}
bool ExternalSemaphoreLinux::importSemaphore(void *extHandle, int fd, uint32_t flags, const char *name, Type type, bool isNative) {
switch (type) {
case ExternalSemaphore::OpaqueFd:
case ExternalSemaphore::TimelineSemaphoreFd:
break;
default:
DEBUG_BREAK_IF(true);
return false;
}
auto drm = this->osInterface->getDriverModel()->as<Drm>();
struct SyncObjHandle args = {};
args.fd = fd;
args.handle = 0;
auto ioctlHelper = drm->getIoctlHelper();
int ret = ioctlHelper->ioctl(DrmIoctl::syncObjFdToHandle, &args);
if (ret != 0) {
return false;
}
if (fd > 0) {
SysCalls::close(fd);
}
this->syncHandle = args.handle;
this->type = type;
return true;
}
bool ExternalSemaphoreLinux::enqueueWait(uint64_t *fenceValue) {
auto drm = this->osInterface->getDriverModel()->as<Drm>();
auto ioctlHelper = drm->getIoctlHelper();
if (this->type == ExternalSemaphore::TimelineSemaphoreFd) {
struct SyncObjTimelineWait args = {};
args.handles = reinterpret_cast<uintptr_t>(&this->syncHandle);
args.points = reinterpret_cast<uintptr_t>(fenceValue);
args.timeoutNs = 0;
args.countHandles = 1u;
args.flags = 0;
int ret = ioctlHelper->ioctl(DrmIoctl::syncObjTimelineWait, &args);
if (ret != 0) {
return false;
}
} else {
struct SyncObjWait args = {};
args.handles = reinterpret_cast<uintptr_t>(&this->syncHandle);
args.timeoutNs = 0;
args.countHandles = 1u;
args.flags = 0;
int ret = ioctlHelper->ioctl(DrmIoctl::syncObjWait, &args);
if (ret != 0) {
return false;
}
}
this->state = SemaphoreState::Signaled;
return true;
}
bool ExternalSemaphoreLinux::enqueueSignal(uint64_t *fenceValue) {
auto drm = this->osInterface->getDriverModel()->as<Drm>();
auto ioctlHelper = drm->getIoctlHelper();
if (this->type == ExternalSemaphore::TimelineSemaphoreFd) {
struct SyncObjTimelineArray args = {};
args.handles = reinterpret_cast<uintptr_t>(&this->syncHandle);
args.points = reinterpret_cast<uintptr_t>(fenceValue);
args.countHandles = 1u;
int ret = ioctlHelper->ioctl(DrmIoctl::syncObjTimelineSignal, &args);
if (ret != 0) {
return false;
}
} else {
struct SyncObjArray args = {};
args.handles = reinterpret_cast<uintptr_t>(&this->syncHandle);
args.countHandles = 1u;
int ret = ioctlHelper->ioctl(DrmIoctl::syncObjSignal, &args);
if (ret != 0) {
return false;
}
}
return true;
}
ExternalSemaphoreLinux::~ExternalSemaphoreLinux() {
// Safety check: only destroy if we have a valid handle and osInterface
if (syncHandle == 0 || osInterface == nullptr) {
return;
}
auto drm = osInterface->getDriverModel()->as<Drm>();
auto ioctlHelper = drm->getIoctlHelper();
SyncObjDestroy args = {};
args.handle = syncHandle;
// Ignore return value - destructor should not throw
ioctlHelper->ioctl(DrmIoctl::syncObjDestroy, &args);
syncHandle = 0;
}
} // namespace NEO
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