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/*
* Copyright (C) 2023 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "gpu_counters"
#include <dlfcn.h>
#include <fcntl.h>
#include <log/log.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define _LOG(level, msg, ...) \
do { \
fprintf(stderr, #level ": " msg "\n", ##__VA_ARGS__); \
ALOG##level(msg, ##__VA_ARGS__); \
} while (false)
#define LOG_ERR(msg, ...) _LOG(E, msg, ##__VA_ARGS__)
#define LOG_WARN(msg, ...) _LOG(W, msg, ##__VA_ARGS__)
#define LOG_INFO(msg, ...) _LOG(I, msg, ##__VA_ARGS__)
#define NELEM(x) (sizeof(x) / sizeof(x[0]))
typedef void (*FN_PTR)(void);
const char* kProducerPaths[] = {
"libgpudataproducer.so",
};
const char* kPidFileName = "/data/local/tmp/gpu_counter_producer.pid";
static FN_PTR loadLibrary(const char* lib) {
char* error;
LOG_INFO("Trying %s", lib);
void* handle = dlopen(lib, RTLD_GLOBAL);
if ((error = dlerror()) != nullptr || handle == nullptr) {
LOG_WARN("Error loading lib: %s", error);
return nullptr;
}
FN_PTR startFunc = (FN_PTR)dlsym(handle, "start");
if ((error = dlerror()) != nullptr) {
LOG_ERR("Error looking for start symbol: %s", error);
dlclose(handle);
return nullptr;
}
return startFunc;
}
static void killExistingProcess() {
int fd = open(kPidFileName, O_RDONLY);
if (fd == -1) {
return;
}
char pidString[10];
if (read(fd, pidString, 10) > 0) {
int pid = -1;
sscanf(pidString, "%d", &pid);
if (pid > 0) {
kill(pid, SIGINT);
}
}
close(fd);
}
static bool writeToPidFile() {
killExistingProcess();
int fd = open(kPidFileName, O_CREAT | O_WRONLY | O_TRUNC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (fd == -1) {
return false;
}
pid_t pid = getpid();
char pidString[10];
sprintf(pidString, "%d", pid);
write(fd, pidString, strlen(pidString));
close(fd);
return true;
}
static void clearPidFile() {
unlink(kPidFileName);
}
static void usage(const char* pname) {
fprintf(stderr,
"Starts the GPU hardware counter profiling Perfetto data producer.\n\n"
"usage: %s [-hf]\n"
" -f: run in the foreground.\n"
" -h: this message.\n",
pname);
}
// Program to load the GPU Perfetto producer .so and call start().
int main(int argc, char** argv) {
const char* pname = argv[0];
bool foreground = false;
int c;
while ((c = getopt(argc, argv, "fh")) != -1) {
switch (c) {
case 'f':
foreground = true;
break;
case '?':
case ':':
case 'h':
usage(pname);
return 1;
}
}
if (optind < argc) {
usage(pname);
return 1;
}
if (!foreground) {
daemon(0, 0);
}
if (getenv("LD_LIBRARY_PATH") == nullptr) {
setenv("LD_LIBRARY_PATH", "/vendor/lib64:/vendor/lib", 0 /*override*/);
LOG_INFO("execv with: LD_LIBRARY_PATH=%s", getenv("LD_LIBRARY_PATH"));
execvpe(pname, argv, environ);
}
if (!writeToPidFile()) {
LOG_ERR("Could not open %s", kPidFileName);
return 1;
}
dlerror(); // Clear any possibly ignored previous error.
FN_PTR startFunc = nullptr;
for (int i = 0; startFunc == nullptr && i < NELEM(kProducerPaths); i++) {
startFunc = loadLibrary(kProducerPaths[i]);
}
if (startFunc == nullptr) {
LOG_ERR("Did not find the producer library");
LOG_ERR("LD_LIBRARY_PATH=%s", getenv("LD_LIBRARY_PATH"));
clearPidFile();
return 1;
}
LOG_INFO("Calling start at %p", startFunc);
(*startFunc)();
LOG_WARN("Producer has exited.");
clearPidFile();
return 0;
}
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