void
get_env_variables(struct rapl_state_s *s){
char *env = NULL;
int package;
int retVal = -1;
env = getenv("READ_ONLY");
if(env == NULL){
//Read only flag has not been set.
//Ensure that it is still zero.
s->mode.read_only_flag = 0;
}
if(env){
s->mode.read_only_flag = strtoll(env,NULL,0);
}
env = getenv("READ_WRITE");
if(env == NULL){
//Read_write flag has not been set.
//Ensure that it is still zero.
s->mode.read_write_flag = 0;
}
if(env){
s->mode.read_write_flag = strtoll(env,NULL,0);
}
/* We are dealing with MSRs and need to be very careful, hence, if the
* environment variables contain any thing other than 1, none of the code
* should run and it should default to the dry-run.
* The dry_run_flag is always 1.
* If read_write_flag is 1, it should not matter what the value of read_only_flag is.
*
* If read_only_flag is 1, the read_write_flag has to be ZERO.
*
* */
if(s->mode.dry_run_flag == 1){
retVal = init_msr();
if(retVal == -1){
fprintf(stderr, "Error in initialization. Exiting.\n");
_exit(EXIT_FAILURE);
}
/*READ_ONLY_MODE*/
if(s->mode.read_only_flag == 1){
/*Need to determine what to do here. Output should probably be a file
* with the measured power values. So, call init_msr(),
* followed by the get_rapl_data(), followed by finalize_msr(). */
fprintf(stdout, "\nIn READ-ONLY mode.\n");
//Now that the permissions are correct, first disable turbo.
for(package=0;package<NUM_PACKAGES; package++){
disable_turbo(package);
}
// You want to do this in here and not in rapl_init because it is safer to do it in here.
// Also, in the dry run, none of this info should be printed.
// You need to have read_msr access to be able to get the info/limit/status.
print_rapl_state_header(s);
for(package=0; package<NUM_PACKAGES; package++){
get_all_info( package, s);
get_all_limit( package, s);
get_all_status(package, s);
gettimeofday( &(s->start[package]), NULL );
}
}
/*READ_WRITE_MODE. Care should be taken that the user has the right permissions, and
* that even if the environment variable is set, you can't write to MSRs unless
* you have the right permissions.
* Also, if both the read_write and read_only_flag are set, it should default to read_only
* under the assumption that the use is not clear about how to use the library correctly */
if(s->mode.read_write_flag == 1 && s->mode.read_only_flag == 0){
fprintf(stdout, "\nIn READ-WRITE mode.\n");
//Now that the permissions are correct, first disable turbo.
for(package=0;package<NUM_PACKAGES; package++){
disable_turbo(package);
}
// You want to do this in here and not in rapl_init because it is safer to do it in here.
print_rapl_state_header(s);
for(package=0; package<NUM_PACKAGES; package++){
get_all_info( package, s);
get_all_limit( package, s);
get_all_status(package, s);
gettimeofday( &(s->start[package]), NULL );
}
//Write to the POWER registers
set_power_bounds();
}
}
}
static void mainboard_init(void *chip_info)
{
#if !CONFIG(ENABLE_TURBO)
disable_turbo();
#endif
}
