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[UR][L0v2] Include subdevices when populating p2p access devices #19871

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[UR][L0v2] Include subdevices when populating p2p access devices #19871

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28 changes: 22 additions & 6 deletions unified-runtime/source/adapters/level_zero/v2/context.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -35,11 +35,28 @@ filterP2PDevices(ur_device_handle_t hSourceDevice,
}

static std::vector<std::vector<ur_device_handle_t>>
populateP2PDevices(size_t maxDevices,
const std::vector<ur_device_handle_t> &devices) {
std::vector<std::vector<ur_device_handle_t>> p2pDevices(maxDevices);
populateP2PDevices(const std::vector<ur_device_handle_t> &devices) {
std::vector<ur_device_handle_t> allDevices;
std::function<void(ur_device_handle_t)> collectDeviceAndSubdevices =
[&allDevices, &collectDeviceAndSubdevices](ur_device_handle_t device) {
allDevices.push_back(device);
for (auto &subDevice : device->SubDevices) {
collectDeviceAndSubdevices(subDevice);
}
};

for (auto &device : devices) {
p2pDevices[device->Id.value()] = filterP2PDevices(device, devices);
collectDeviceAndSubdevices(device);
}

uint64_t maxDeviceId = 0;
for (auto &device : allDevices) {
maxDeviceId = std::max(maxDeviceId, device->Id.value());
}

std::vector<std::vector<ur_device_handle_t>> p2pDevices(maxDeviceId + 1);
for (auto &device : allDevices) {
p2pDevices[device->Id.value()] = filterP2PDevices(device, allDevices);
}
return p2pDevices;
}
Expand Down Expand Up @@ -83,8 +100,7 @@ ur_context_handle_t_::ur_context_handle_t_(ze_context_handle_t hContext,
nativeEventsPool(this, std::make_unique<v2::provider_normal>(
this, v2::QUEUE_IMMEDIATE,
v2::EVENT_FLAGS_PROFILING_ENABLED)),
p2pAccessDevices(populateP2PDevices(
phDevices[0]->Platform->getNumDevices(), this->hDevices)),
p2pAccessDevices(populateP2PDevices(this->hDevices)),
defaultUSMPool(this, nullptr), asyncPool(this, nullptr) {}

ur_result_t ur_context_handle_t_::retain() {
Expand Down
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