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/*************************************************************************
* Copyright (c) 2015-2019, NVIDIA CORPORATION. All rights reserved.
*
* See LICENSE.txt for license information
************************************************************************/
#include "nvmlwrap.h"
#ifndef NVML_DIRECT
#include <dlfcn.h>
#include "core.h"
static enum { nvmlUninitialized, nvmlInitializing, nvmlInitialized, nvmlError } nvmlState = nvmlUninitialized;
static nvmlReturn_t (*nvmlInternalInit)(void);
static nvmlReturn_t (*nvmlInternalShutdown)(void);
static nvmlReturn_t (*nvmlInternalDeviceGetHandleByPciBusId)(const char* pciBusId, nvmlDevice_t* device);
static nvmlReturn_t (*nvmlInternalDeviceGetIndex)(nvmlDevice_t device, unsigned* index);
static const char* (*nvmlInternalErrorString)(nvmlReturn_t r);
static nvmlReturn_t (*nvmlInternalDeviceGetNvLinkState)(nvmlDevice_t device, unsigned int link, nvmlEnableState_t *isActive);
static nvmlReturn_t (*nvmlInternalDeviceGetPciInfo)(nvmlDevice_t device, nvmlPciInfo_t* pci);
static nvmlReturn_t (*nvmlInternalDeviceGetNvLinkRemotePciInfo)(nvmlDevice_t device, unsigned int link, nvmlPciInfo_t *pci);
static nvmlReturn_t (*nvmlInternalDeviceGetNvLinkCapability)(nvmlDevice_t device, unsigned int link,
nvmlNvLinkCapability_t capability, unsigned int *capResult);
static nvmlReturn_t (*nvmlInternalDeviceGetMinorNumber)(nvmlDevice_t device, unsigned int* minorNumber);
ncclResult_t wrapNvmlSymbols(void) {
if (nvmlState == nvmlInitialized)
return ncclSuccess;
if (nvmlState == nvmlError)
return ncclSystemError;
if (__sync_bool_compare_and_swap(&nvmlState, nvmlUninitialized, nvmlInitializing) == false) {
// Another thread raced in front of us. Wait for it to be done.
while (nvmlState == nvmlInitializing) pthread_yield();
return (nvmlState == nvmlInitialized) ? ncclSuccess : ncclSystemError;
}
static void* nvmlhandle = NULL;
void* tmp;
void** cast;
nvmlhandle=dlopen("libnvidia-ml.so.1", RTLD_NOW);
if (!nvmlhandle) {
WARN("Failed to open libnvidia-ml.so.1");
goto teardown;
}
#define LOAD_SYM(handle, symbol, funcptr) do { \
cast = (void**)&funcptr; \
tmp = dlsym(handle, symbol); \
if (tmp == NULL) { \
WARN("dlsym failed on %s - %s", symbol, dlerror());\
goto teardown; \
} \
*cast = tmp; \
} while (0)
#define LOAD_SYM_OPTIONAL(handle, symbol, funcptr) do {\
cast = (void**)&funcptr; \
tmp = dlsym(handle, symbol); \
if (tmp == NULL) { \
INFO(NCCL_INIT,"dlsym failed on %s, ignoring", symbol); \
} \
*cast = tmp; \
} while (0)
LOAD_SYM(nvmlhandle, "nvmlInit", nvmlInternalInit);
LOAD_SYM(nvmlhandle, "nvmlShutdown", nvmlInternalShutdown);
LOAD_SYM(nvmlhandle, "nvmlDeviceGetHandleByPciBusId", nvmlInternalDeviceGetHandleByPciBusId);
LOAD_SYM(nvmlhandle, "nvmlDeviceGetIndex", nvmlInternalDeviceGetIndex);
LOAD_SYM(nvmlhandle, "nvmlErrorString", nvmlInternalErrorString);
LOAD_SYM(nvmlhandle, "nvmlDeviceGetPciInfo", nvmlInternalDeviceGetPciInfo);
LOAD_SYM(nvmlhandle, "nvmlDeviceGetMinorNumber", nvmlInternalDeviceGetMinorNumber);
LOAD_SYM_OPTIONAL(nvmlhandle, "nvmlDeviceGetNvLinkState", nvmlInternalDeviceGetNvLinkState);
LOAD_SYM_OPTIONAL(nvmlhandle, "nvmlDeviceGetNvLinkRemotePciInfo", nvmlInternalDeviceGetNvLinkRemotePciInfo);
LOAD_SYM_OPTIONAL(nvmlhandle, "nvmlDeviceGetNvLinkCapability", nvmlInternalDeviceGetNvLinkCapability);
nvmlState = nvmlInitialized;
return ncclSuccess;
teardown:
nvmlInternalInit = NULL;
nvmlInternalShutdown = NULL;
nvmlInternalDeviceGetHandleByPciBusId = NULL;
nvmlInternalDeviceGetIndex = NULL;
nvmlInternalDeviceGetPciInfo = NULL;
nvmlInternalDeviceGetMinorNumber = NULL;
nvmlInternalDeviceGetNvLinkState = NULL;
nvmlInternalDeviceGetNvLinkRemotePciInfo = NULL;
nvmlInternalDeviceGetNvLinkCapability = NULL;
if (nvmlhandle != NULL) dlclose(nvmlhandle);
nvmlState = nvmlError;
return ncclSystemError;
}
ncclResult_t wrapNvmlInit(void) {
if (nvmlInternalInit == NULL) {
WARN("lib wrapper not initialized.");
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalInit();
if (ret != NVML_SUCCESS) {
WARN("nvmlInit() failed: %s",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
ncclResult_t wrapNvmlShutdown(void) {
if (nvmlInternalShutdown == NULL) {
WARN("lib wrapper not initialized.");
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalShutdown();
if (ret != NVML_SUCCESS) {
WARN("nvmlShutdown() failed: %s ",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
ncclResult_t wrapNvmlDeviceGetHandleByPciBusId(const char* pciBusId, nvmlDevice_t* device) {
if (nvmlInternalDeviceGetHandleByPciBusId == NULL) {
WARN("lib wrapper not initialized.");
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalDeviceGetHandleByPciBusId(pciBusId, device);
if (ret != NVML_SUCCESS) {
WARN("nvmlDeviceGetHandleByPciBusId() failed: %s ",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
ncclResult_t wrapNvmlDeviceGetIndex(nvmlDevice_t device, unsigned* index) {
if (nvmlInternalDeviceGetIndex == NULL) {
WARN("lib wrapper not initialized.");
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalDeviceGetIndex(device, index);
if (ret != NVML_SUCCESS) {
WARN("nvmlDeviceGetIndex() failed: %s ",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
ncclResult_t wrapNvmlDeviceGetPciInfo(nvmlDevice_t device, nvmlPciInfo_t* pci) {
if (nvmlInternalDeviceGetPciInfo == NULL) {
WARN("lib wrapper not initialized.");
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalDeviceGetPciInfo(device, pci);
if (ret != NVML_SUCCESS) {
WARN("nvmlDeviceGetPciInfo() failed: %s ",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
ncclResult_t wrapNvmlDeviceGetMinorNumber(nvmlDevice_t device, unsigned int* minorNumber) {
if (nvmlInternalDeviceGetMinorNumber == NULL) {
WARN("lib wrapper not initialized.");
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalDeviceGetMinorNumber(device, minorNumber);
if (ret != NVML_SUCCESS) {
WARN("nvmlDeviceGetMinorNumber() failed: %s ",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
ncclResult_t wrapNvmlDeviceGetNvLinkState(nvmlDevice_t device, unsigned int link, nvmlEnableState_t *isActive) {
if (nvmlInternalDeviceGetNvLinkState == NULL) {
/* Do not warn, this symbol is optional. */
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalDeviceGetNvLinkState(device, link, isActive);
if (ret != NVML_SUCCESS) {
if (ret != NVML_ERROR_NOT_SUPPORTED)
INFO(NCCL_INIT,"nvmlDeviceGetNvLinkState() failed: %s ",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
ncclResult_t wrapNvmlDeviceGetNvLinkRemotePciInfo(nvmlDevice_t device, unsigned int link, nvmlPciInfo_t *pci) {
if (nvmlInternalDeviceGetNvLinkRemotePciInfo == NULL) {
/* Do not warn, this symbol is optional. */
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalDeviceGetNvLinkRemotePciInfo(device, link, pci);
if (ret != NVML_SUCCESS) {
if (ret != NVML_ERROR_NOT_SUPPORTED)
INFO(NCCL_INIT,"nvmlDeviceGetNvLinkRemotePciInfo() failed: %s ",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
ncclResult_t wrapNvmlDeviceGetNvLinkCapability(nvmlDevice_t device, unsigned int link,
nvmlNvLinkCapability_t capability, unsigned int *capResult) {
if (nvmlInternalDeviceGetNvLinkCapability == NULL) {
/* Do not warn, this symbol is optional. */
return ncclInternalError;
}
nvmlReturn_t ret = nvmlInternalDeviceGetNvLinkCapability(device, link, capability, capResult);
if (ret != NVML_SUCCESS) {
if (ret != NVML_ERROR_NOT_SUPPORTED)
INFO(NCCL_INIT,"nvmlDeviceGetNvLinkCapability() failed: %s ",
nvmlInternalErrorString(ret));
return ncclSystemError;
}
return ncclSuccess;
}
#endif
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