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[coro_io] add pci_bus_id() to cuda_device and cache result at init #1178

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Merged
poor-circle merged 1 commit into from
May 15, 2026
+22 −1
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[coro_io] add pci_bus_id() to cuda_device and cache result at init #1178

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23 changes: 22 additions & 1 deletion include/ylt/coro_io/cuda/cuda_device.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
#pragma once

#include <atomic>
#include <cstdio>
#include <memory>
#include <mutex>
#include <span>
Expand Down Expand Up @@ -132,13 +133,33 @@ class cuda_device_t : public std::enable_shared_from_this<cuda_device_t> {
else {
name_.clear();
}
ELOG_INFO << "Get cuda device(" << gpu_id_ << "): " << name_;
pci_bus_id_ = query_pci_bus_id();
ELOG_INFO << "Get cuda device(" << gpu_id_ << "): " << name_
<< ", PCI: " << pci_bus_id_;
}
int get_gpu_id() const noexcept { return gpu_id_; }
std::string_view name() const noexcept { return name_; }

// Returns PCI bus ID string in "DDDD:BB:DD.0" format.
std::string pci_bus_id() const { return pci_bus_id_; }

private:
std::string query_pci_bus_id() const {
int domain_id = 0, bus_id = 0, dev_id = 0;
YLT_CHECK_CUDA_ERR(cuDeviceGetAttribute(
&domain_id, CU_DEVICE_ATTRIBUTE_PCI_DOMAIN_ID, device_));
YLT_CHECK_CUDA_ERR(
cuDeviceGetAttribute(&bus_id, CU_DEVICE_ATTRIBUTE_PCI_BUS_ID, device_));
YLT_CHECK_CUDA_ERR(cuDeviceGetAttribute(
&dev_id, CU_DEVICE_ATTRIBUTE_PCI_DEVICE_ID, device_));
char buf[64];
std::snprintf(buf, sizeof(buf), "%04x:%02x:%02x.0", domain_id, bus_id,
dev_id);
return std::string(buf);
}

std::string name_;
std::string pci_bus_id_;
int gpu_id_;
CUcontext context_;
CUdevice device_;
Expand Down
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