cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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attr_test.c (2010B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * PAPR Energy attributes sniff test
      4 * This checks if the papr folders and contents are populated relating to
      5 * the energy and frequency attributes
      6 *
      7 * Copyright 2022, Pratik Rajesh Sampat, IBM Corp.
      8 */
      9
     10#include <stdio.h>
     11#include <string.h>
     12#include <dirent.h>
     13#include <sys/types.h>
     14#include <sys/stat.h>
     15#include <unistd.h>
     16#include <stdlib.h>
     17
     18#include "utils.h"
     19
     20enum energy_freq_attrs {
     21	POWER_PERFORMANCE_MODE = 1,
     22	IDLE_POWER_SAVER_STATUS = 2,
     23	MIN_FREQ = 3,
     24	STAT_FREQ = 4,
     25	MAX_FREQ = 6,
     26	PROC_FOLDING_STATUS = 8
     27};
     28
     29enum type {
     30	INVALID,
     31	STR_VAL,
     32	NUM_VAL
     33};
     34
     35int value_type(int id)
     36{
     37	int val_type;
     38
     39	switch (id) {
     40	case POWER_PERFORMANCE_MODE:
     41	case IDLE_POWER_SAVER_STATUS:
     42		val_type = STR_VAL;
     43		break;
     44	case MIN_FREQ:
     45	case STAT_FREQ:
     46	case MAX_FREQ:
     47	case PROC_FOLDING_STATUS:
     48		val_type = NUM_VAL;
     49		break;
     50	default:
     51		val_type = INVALID;
     52	}
     53
     54	return val_type;
     55}
     56
     57int verify_energy_info(void)
     58{
     59	const char *path = "/sys/firmware/papr/energy_scale_info";
     60	struct dirent *entry;
     61	struct stat s;
     62	DIR *dirp;
     63
     64	if (stat(path, &s) || !S_ISDIR(s.st_mode))
     65		return -1;
     66	dirp = opendir(path);
     67
     68	while ((entry = readdir(dirp)) != NULL) {
     69		char file_name[64];
     70		int id, attr_type;
     71		FILE *f;
     72
     73		if (strcmp(entry->d_name, ".") == 0 ||
     74		    strcmp(entry->d_name, "..") == 0)
     75			continue;
     76
     77		id = atoi(entry->d_name);
     78		attr_type = value_type(id);
     79		if (attr_type == INVALID)
     80			return -1;
     81
     82		/* Check if the files exist and have data in them */
     83		sprintf(file_name, "%s/%d/desc", path, id);
     84		f = fopen(file_name, "r");
     85		if (!f || fgetc(f) == EOF)
     86			return -1;
     87
     88		sprintf(file_name, "%s/%d/value", path, id);
     89		f = fopen(file_name, "r");
     90		if (!f || fgetc(f) == EOF)
     91			return -1;
     92
     93		if (attr_type == STR_VAL) {
     94			sprintf(file_name, "%s/%d/value_desc", path, id);
     95			f = fopen(file_name, "r");
     96			if (!f || fgetc(f) == EOF)
     97				return -1;
     98		}
     99	}
    100
    101	return 0;
    102}
    103
    104int main(void)
    105{
    106	return test_harness(verify_energy_info, "papr_attributes");
    107}