/* * SPDX-FileCopyrightText: Copyright (c) 2009-2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved. * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Licensed under the Apache License v2.0 with LLVM Exceptions. * See LICENSE.txt for license information. */ #ifndef NVTX_IMPL_GUARD #error Never include this file directly -- it is automatically included by nvToolsExt.h (except when NVTX_NO_IMPL is defined). #endif /* ---- Platform-independent helper definitions and functions ---- */ /* Prefer macros over inline functions to reduce symbol resolution at link time */ #if defined(_WIN32) #define NVTX_PATHCHAR wchar_t #define NVTX_STR(x) L##x #define NVTX_GETENV _wgetenv #define NVTX_BUFSIZE 16384 #define NVTX_DLLHANDLE HMODULE #define NVTX_DLLOPEN(x) LoadLibraryW(x) #define NVTX_DLLFUNC GetProcAddress #define NVTX_DLLCLOSE FreeLibrary #define NVTX_YIELD() SwitchToThread() #define NVTX_MEMBAR() MemoryBarrier() #define NVTX_ATOMIC_WRITE_32(address, value) InterlockedExchange((volatile LONG*)address, value) #define NVTX_ATOMIC_CAS_32(old, address, exchange, comparand) old = InterlockedCompareExchange((volatile LONG*)address, exchange, comparand) #elif defined(__GNUC__) #define NVTX_PATHCHAR char #define NVTX_STR(x) x #define NVTX_GETENV getenv #define NVTX_BUFSIZE 16384 #define NVTX_DLLHANDLE void* #define NVTX_DLLOPEN(x) dlopen(x, RTLD_LAZY) #define NVTX_DLLFUNC dlsym #define NVTX_DLLCLOSE dlclose #define NVTX_YIELD() sched_yield() #define NVTX_MEMBAR() __sync_synchronize() /* Ensure full memory barrier for atomics, to match Windows functions */ #define NVTX_ATOMIC_WRITE_32(address, value) __sync_synchronize(); __sync_lock_test_and_set(address, value) #define NVTX_ATOMIC_CAS_32(old, address, exchange, comparand) __sync_synchronize(); old = __sync_val_compare_and_swap(address, exchange, comparand) #else #error The library does not support your configuration! #endif /* Define this to 1 for platforms that where pre-injected libraries can be discovered. */ #if defined(_WIN32) /* TODO */ #define NVTX_SUPPORT_ALREADY_INJECTED_LIBRARY 0 #else #define NVTX_SUPPORT_ALREADY_INJECTED_LIBRARY 0 #endif /* Define this to 1 for platforms that support environment variables */ /* TODO: Detect UWP, a.k.a. Windows Store app, and set this to 0. */ /* Try: #if defined(WINAPI_FAMILY_PARTITION) && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) */ #define NVTX_SUPPORT_ENV_VARS 1 /* Define this to 1 for platforms that support dynamic/shared libraries */ #define NVTX_SUPPORT_DYNAMIC_INJECTION_LIBRARY 1 /* Injection libraries implementing InitializeInjectionNvtx2 may be statically linked, * and this will override any dynamic injection. Useful for platforms where dynamic * injection is not available. Since weak symbols not explicitly marked extern are * guaranteed to be initialized to zero if no definitions are found by the linker, the * dynamic injection process proceeds normally if pfnInitializeInjectionNvtx2 is 0. */ #if defined(__GNUC__) && !defined(_WIN32) && !defined(__CYGWIN__) #define NVTX_SUPPORT_STATIC_INJECTION_LIBRARY 1 /* To statically inject an NVTX library, define InitializeInjectionNvtx2_fnptr as a normal * symbol (not weak) pointing to the implementation of InitializeInjectionNvtx2 (which * does not need to be named "InitializeInjectionNvtx2" as is necessary in a dynamic * injection library. */ __attribute__((weak)) NvtxInitializeInjectionNvtxFunc_t InitializeInjectionNvtx2_fnptr; #else #define NVTX_SUPPORT_STATIC_INJECTION_LIBRARY 0 #endif /* This function tries to find or load an NVTX injection library and get the * address of its InitializeInjection2 function. If such a function pointer * is found, it is called, and passed the address of this NVTX instance's * nvtxGetExportTable function, so the injection can attach to this instance. * If the initialization fails for any reason, any dynamic library loaded will * be freed, and all NVTX implementation functions will be set to no-ops. If * initialization succeeds, NVTX functions not attached to the tool will be set * to no-ops. This is implemented as one function instead of several small * functions to minimize the number of weak symbols the linker must resolve. * Order of search is: * - Pre-injected library exporting InitializeInjectionNvtx2 * - Loadable library exporting InitializeInjectionNvtx2 * - Path specified by env var NVTX_INJECTION??_PATH (?? is 32 or 64) * - On Android, libNvtxInjection??.so within the package (?? is 32 or 64) * - Statically-linked injection library defining InitializeInjectionNvtx2_fnptr */ NVTX_LINKONCE_FWDDECL_FUNCTION int NVTX_VERSIONED_IDENTIFIER(nvtxInitializeInjectionLibrary)(void); NVTX_LINKONCE_DEFINE_FUNCTION int NVTX_VERSIONED_IDENTIFIER(nvtxInitializeInjectionLibrary)(void) { const char* const initFuncName = "InitializeInjectionNvtx2"; NvtxInitializeInjectionNvtxFunc_t init_fnptr = (NvtxInitializeInjectionNvtxFunc_t)0; NVTX_DLLHANDLE injectionLibraryHandle = (NVTX_DLLHANDLE)0; int entryPointStatus = 0; #if NVTX_SUPPORT_ALREADY_INJECTED_LIBRARY /* Use POSIX global symbol chain to query for init function from any module */ init_fnptr = (NvtxInitializeInjectionNvtxFunc_t)NVTX_DLLFUNC(0, initFuncName); #endif #if NVTX_SUPPORT_DYNAMIC_INJECTION_LIBRARY /* Try discovering dynamic injection library to load */ if (!init_fnptr) { #if NVTX_SUPPORT_ENV_VARS /* If env var NVTX_INJECTION64_PATH is set, it should contain the path * to a 64-bit dynamic NVTX injection library (and similar for 32-bit). */ const NVTX_PATHCHAR* const nvtxEnvVarName = (sizeof(void*) == 4) ? NVTX_STR("NVTX_INJECTION32_PATH") : NVTX_STR("NVTX_INJECTION64_PATH"); #endif /* NVTX_SUPPORT_ENV_VARS */ NVTX_PATHCHAR injectionLibraryPathBuf[NVTX_BUFSIZE]; const NVTX_PATHCHAR* injectionLibraryPath = (const NVTX_PATHCHAR*)0; /* Refer to this variable explicitly in case all references to it are #if'ed out */ (void)injectionLibraryPathBuf; #if NVTX_SUPPORT_ENV_VARS /* Disable the warning for getenv & _wgetenv -- this usage is safe because * these functions are not called again before using the returned value. */ #if defined(_MSC_VER) #pragma warning( push ) #pragma warning( disable : 4996 ) #endif injectionLibraryPath = NVTX_GETENV(nvtxEnvVarName); #if defined(_MSC_VER) #pragma warning( pop ) #endif #endif #if defined(__ANDROID__) if (!injectionLibraryPath) { const char *bits = (sizeof(void*) == 4) ? "32" : "64"; char cmdlineBuf[32]; char pkgName[PATH_MAX]; int count; int pid; FILE *fp; size_t bytesRead; size_t pos; pid = (int)getpid(); count = snprintf(cmdlineBuf, sizeof(cmdlineBuf), "/proc/%d/cmdline", pid); if (count <= 0 || count >= (int)sizeof(cmdlineBuf)) { NVTX_ERR("Path buffer too small for: /proc/%d/cmdline\n", pid); return NVTX_ERR_INIT_ACCESS_LIBRARY; } fp = fopen(cmdlineBuf, "r"); if (!fp) { NVTX_ERR("File couldn't be opened: %s\n", cmdlineBuf); return NVTX_ERR_INIT_ACCESS_LIBRARY; } bytesRead = fread(pkgName, 1, sizeof(pkgName) - 1, fp); fclose(fp); if (bytesRead == 0) { NVTX_ERR("Package name couldn't be read from file: %s\n", cmdlineBuf); return NVTX_ERR_INIT_ACCESS_LIBRARY; } pkgName[bytesRead] = 0; /* String can contain colon as a process separator. In this case the package name is before the colon. */ pos = 0; while (pos < bytesRead && pkgName[pos] != ':' && pkgName[pos] != '\0') { ++pos; } pkgName[pos] = 0; count = snprintf(injectionLibraryPathBuf, NVTX_BUFSIZE, "/data/data/%s/files/libNvtxInjection%s.so", pkgName, bits); if (count <= 0 || count >= NVTX_BUFSIZE) { NVTX_ERR("Path buffer too small for: /data/data/%s/files/libNvtxInjection%s.so\n", pkgName, bits); return NVTX_ERR_INIT_ACCESS_LIBRARY; } /* On Android, verify path is accessible due to aggressive file access restrictions. */ /* For dlopen, if the filename contains a leading slash, then it is interpreted as a */ /* relative or absolute pathname; otherwise it will follow the rules in ld.so. */ if (injectionLibraryPathBuf[0] == '/') { #if (__ANDROID_API__ < 21) int access_err = access(injectionLibraryPathBuf, F_OK | R_OK); #else int access_err = faccessat(AT_FDCWD, injectionLibraryPathBuf, F_OK | R_OK, 0); #endif if (access_err != 0) { NVTX_ERR("Injection library path wasn't accessible [code=%s] [path=%s]\n", strerror(errno), injectionLibraryPathBuf); return NVTX_ERR_INIT_ACCESS_LIBRARY; } } injectionLibraryPath = injectionLibraryPathBuf; } #endif /* At this point, injectionLibraryPath is specified if a dynamic * injection library was specified by a tool. */ if (injectionLibraryPath) { /* Load the injection library */ injectionLibraryHandle = NVTX_DLLOPEN(injectionLibraryPath); if (!injectionLibraryHandle) { NVTX_ERR("Failed to load injection library\n"); return NVTX_ERR_INIT_LOAD_LIBRARY; } else { /* Attempt to get the injection library's entry-point */ init_fnptr = (NvtxInitializeInjectionNvtxFunc_t)NVTX_DLLFUNC(injectionLibraryHandle, initFuncName); if (!init_fnptr) { NVTX_DLLCLOSE(injectionLibraryHandle); NVTX_ERR("Failed to get address of function InitializeInjectionNvtx2 from injection library\n"); return NVTX_ERR_INIT_MISSING_LIBRARY_ENTRY_POINT; } } } } #endif #if NVTX_SUPPORT_STATIC_INJECTION_LIBRARY if (!init_fnptr) { /* Check weakly-defined function pointer. A statically-linked injection can define this as * a normal symbol and it will take precedence over a dynamic injection. */ if (InitializeInjectionNvtx2_fnptr) { init_fnptr = InitializeInjectionNvtx2_fnptr; } } #endif /* At this point, if init_fnptr is not set, then no tool has specified * an NVTX injection library -- return non-success result so all NVTX * API functions will be set to no-ops. */ if (!init_fnptr) { return NVTX_ERR_NO_INJECTION_LIBRARY_AVAILABLE; } /* Invoke injection library's initialization function. If it returns * 0 (failure) and a dynamic injection was loaded, unload it. */ entryPointStatus = init_fnptr(NVTX_VERSIONED_IDENTIFIER(nvtxGetExportTable)); if (entryPointStatus == 0) { NVTX_ERR("Failed to initialize injection library -- initialization function returned 0\n"); if (injectionLibraryHandle) { NVTX_DLLCLOSE(injectionLibraryHandle); } return NVTX_ERR_INIT_FAILED_LIBRARY_ENTRY_POINT; } return NVTX_SUCCESS; } NVTX_LINKONCE_DEFINE_FUNCTION void NVTX_VERSIONED_IDENTIFIER(nvtxInitOnce)(void) { unsigned int old; if (NVTX_VERSIONED_IDENTIFIER(nvtxGlobals).initState == NVTX_INIT_STATE_COMPLETE) { return; } NVTX_ATOMIC_CAS_32( old, &NVTX_VERSIONED_IDENTIFIER(nvtxGlobals).initState, NVTX_INIT_STATE_STARTED, NVTX_INIT_STATE_FRESH); if (old == NVTX_INIT_STATE_FRESH) { int result; int forceAllToNoops; /* Load & initialize injection library -- it will assign the function pointers */ result = NVTX_VERSIONED_IDENTIFIER(nvtxInitializeInjectionLibrary)(); /* Set all pointers not assigned by the injection to null */ forceAllToNoops = result != NVTX_SUCCESS; /* Set all to null if injection init failed */ NVTX_VERSIONED_IDENTIFIER(nvtxSetInitFunctionsToNoops)(forceAllToNoops); /* Signal that initialization has finished, so now the assigned function pointers will be used */ NVTX_ATOMIC_WRITE_32( &NVTX_VERSIONED_IDENTIFIER(nvtxGlobals).initState, NVTX_INIT_STATE_COMPLETE); } else /* Spin-wait until initialization has finished */ { NVTX_MEMBAR(); while (NVTX_VERSIONED_IDENTIFIER(nvtxGlobals).initState != NVTX_INIT_STATE_COMPLETE) { NVTX_YIELD(); NVTX_MEMBAR(); } } }