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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sw-clock.c (3374B)


      1// SPDX-License-Identifier: GPL-2.0
      2#include <errno.h>
      3#include <inttypes.h>
      4#include <unistd.h>
      5#include <stdlib.h>
      6#include <signal.h>
      7#include <sys/mman.h>
      8#include <linux/string.h>
      9
     10#include "tests.h"
     11#include "util/debug.h"
     12#include "util/evsel.h"
     13#include "util/evlist.h"
     14#include "util/cpumap.h"
     15#include "util/mmap.h"
     16#include "util/thread_map.h"
     17#include <perf/evlist.h>
     18#include <perf/mmap.h>
     19
     20#define NR_LOOPS  10000000
     21
     22/*
     23 * This test will open software clock events (cpu-clock, task-clock)
     24 * then check their frequency -> period conversion has no artifact of
     25 * setting period to 1 forcefully.
     26 */
     27static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
     28{
     29	int i, err = -1;
     30	volatile int tmp = 0;
     31	u64 total_periods = 0;
     32	int nr_samples = 0;
     33	char sbuf[STRERR_BUFSIZE];
     34	union perf_event *event;
     35	struct evsel *evsel;
     36	struct evlist *evlist;
     37	struct perf_event_attr attr = {
     38		.type = PERF_TYPE_SOFTWARE,
     39		.config = clock_id,
     40		.sample_type = PERF_SAMPLE_PERIOD,
     41		.exclude_kernel = 1,
     42		.disabled = 1,
     43		.freq = 1,
     44	};
     45	struct perf_cpu_map *cpus = NULL;
     46	struct perf_thread_map *threads = NULL;
     47	struct mmap *md;
     48
     49	attr.sample_freq = 500;
     50
     51	evlist = evlist__new();
     52	if (evlist == NULL) {
     53		pr_debug("evlist__new\n");
     54		return -1;
     55	}
     56
     57	evsel = evsel__new(&attr);
     58	if (evsel == NULL) {
     59		pr_debug("evsel__new\n");
     60		goto out_delete_evlist;
     61	}
     62	evlist__add(evlist, evsel);
     63
     64	cpus = perf_cpu_map__dummy_new();
     65	threads = thread_map__new_by_tid(getpid());
     66	if (!cpus || !threads) {
     67		err = -ENOMEM;
     68		pr_debug("Not enough memory to create thread/cpu maps\n");
     69		goto out_delete_evlist;
     70	}
     71
     72	perf_evlist__set_maps(&evlist->core, cpus, threads);
     73
     74	if (evlist__open(evlist)) {
     75		const char *knob = "/proc/sys/kernel/perf_event_max_sample_rate";
     76
     77		err = -errno;
     78		pr_debug("Couldn't open evlist: %s\nHint: check %s, using %" PRIu64 " in this test.\n",
     79			 str_error_r(errno, sbuf, sizeof(sbuf)),
     80			 knob, (u64)attr.sample_freq);
     81		goto out_delete_evlist;
     82	}
     83
     84	err = evlist__mmap(evlist, 128);
     85	if (err < 0) {
     86		pr_debug("failed to mmap event: %d (%s)\n", errno,
     87			 str_error_r(errno, sbuf, sizeof(sbuf)));
     88		goto out_delete_evlist;
     89	}
     90
     91	evlist__enable(evlist);
     92
     93	/* collect samples */
     94	for (i = 0; i < NR_LOOPS; i++)
     95		tmp++;
     96
     97	evlist__disable(evlist);
     98
     99	md = &evlist->mmap[0];
    100	if (perf_mmap__read_init(&md->core) < 0)
    101		goto out_init;
    102
    103	while ((event = perf_mmap__read_event(&md->core)) != NULL) {
    104		struct perf_sample sample;
    105
    106		if (event->header.type != PERF_RECORD_SAMPLE)
    107			goto next_event;
    108
    109		err = evlist__parse_sample(evlist, event, &sample);
    110		if (err < 0) {
    111			pr_debug("Error during parse sample\n");
    112			goto out_delete_evlist;
    113		}
    114
    115		total_periods += sample.period;
    116		nr_samples++;
    117next_event:
    118		perf_mmap__consume(&md->core);
    119	}
    120	perf_mmap__read_done(&md->core);
    121
    122out_init:
    123	if ((u64) nr_samples == total_periods) {
    124		pr_debug("All (%d) samples have period value of 1!\n",
    125			 nr_samples);
    126		err = -1;
    127	}
    128
    129out_delete_evlist:
    130	perf_cpu_map__put(cpus);
    131	perf_thread_map__put(threads);
    132	evlist__delete(evlist);
    133	return err;
    134}
    135
    136static int test__sw_clock_freq(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
    137{
    138	int ret;
    139
    140	ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
    141	if (!ret)
    142		ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
    143
    144	return ret;
    145}
    146
    147DEFINE_SUITE("Software clock events period values", sw_clock_freq);