Adding file that varies freq and reads freq on Jetson

llvm/projects/hpvm-tensor-rt/tensor_runtime/src/freq_utils.cc

+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+
+
+
+const char* available_freqs[] = {"140250000", "229500000", "318750000", "408000000", "497250000",
+				 "586500000", "675750000", "765000000", "854250000",
+				 "943500000", "1032750000", "1122000000", "1211250000", "1300500000"};
+
+
+void updateJetsonGPUFreq(int freq_level){
+
+  if (freq_level < 0 || freq_level > 13){
+    printf("ERRROR: Provide freq level between {0, 13}  \n\n\n");
+    abort();
+  }
+
+  const char* freq_val = available_freqs[freq_level]; 
+  printf("freq-val[0] = %s \n", freq_val);
+  
+
+  FILE* max_file = fopen("/sys/devices/17000000.gp10b/devfreq/17000000.gp10b/max_freq", "w+");
+
+  if (max_file == NULL){
+    printf("Could not min_freq file \n");
+  }
+
+  fwrite(freq_val, strlen(freq_val), 1, max_file);
+
+  fclose(max_file);
+
+  
+  FILE* min_file = fopen("/sys/devices/17000000.gp10b/devfreq/17000000.gp10b/min_freq", "w+");
+
+  if (min_file == NULL){
+    printf("Could not min_freq file \n");
+    abort();
+  }
+
+  fwrite(freq_val, strlen(freq_val), 1, min_file);
+
+  fclose(min_file);
+ 
+}
+
+
+
+unsigned long int readJetsonGPUFreq(){
+ 
+  FILE* cur_freq_file = fopen("/sys/devices/17000000.gp10b/devfreq/17000000.gp10b/cur_freq", "r");
+
+  if (cur_freq_file == NULL){
+    printf("Could not open cur_freq file \n");
+  }
+
+
+  char buf[50];
+  char* ptr;
+  
+  fread(buf, 50, 1, cur_freq_file);
+
+  unsigned long cur_freq = strtoul(buf, &ptr, 10);
+
+  fclose(cur_freq_file);
+
+  return cur_freq;
+}
+
+
+
+int main(){
+
+  updateJetsonGPUFreq(7);
+
+  unsigned long int cur_freq = readJetsonGPUFreq();
+
+  printf("** cur_freq = %lu \n\n", cur_freq);
+  
+  return 0;
+}