169 lines
3.9 KiB
C
169 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <linux/types.h>
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#include <sys/prctl.h>
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#include "parse-events.h"
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "tsc.h"
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#include "tests/tests.h"
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#include "arch-tests.h"
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#define CHECK__(x) { \
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while ((x) < 0) { \
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pr_debug(#x " failed!\n"); \
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goto out_err; \
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} \
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}
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#define CHECK_NOT_NULL__(x) { \
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while ((x) == NULL) { \
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pr_debug(#x " failed!\n"); \
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goto out_err; \
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} \
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}
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/**
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* test__perf_time_to_tsc - test converting perf time to TSC.
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*
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* This function implements a test that checks that the conversion of perf time
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* to and from TSC is consistent with the order of events. If the test passes
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* %0 is returned, otherwise %-1 is returned. If TSC conversion is not
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* supported then then the test passes but " (not supported)" is printed.
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*/
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int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct record_opts opts = {
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.mmap_pages = UINT_MAX,
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.user_freq = UINT_MAX,
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.user_interval = ULLONG_MAX,
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.target = {
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.uses_mmap = true,
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},
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.sample_time = true,
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};
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struct thread_map *threads = NULL;
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struct cpu_map *cpus = NULL;
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struct perf_evlist *evlist = NULL;
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struct perf_evsel *evsel = NULL;
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int err = -1, ret, i;
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const char *comm1, *comm2;
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struct perf_tsc_conversion tc;
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struct perf_event_mmap_page *pc;
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union perf_event *event;
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u64 test_tsc, comm1_tsc, comm2_tsc;
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u64 test_time, comm1_time = 0, comm2_time = 0;
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struct perf_mmap *md;
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threads = thread_map__new(-1, getpid(), UINT_MAX);
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CHECK_NOT_NULL__(threads);
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cpus = cpu_map__new(NULL);
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CHECK_NOT_NULL__(cpus);
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evlist = perf_evlist__new();
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CHECK_NOT_NULL__(evlist);
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perf_evlist__set_maps(evlist, cpus, threads);
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CHECK__(parse_events(evlist, "cycles:u", NULL));
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perf_evlist__config(evlist, &opts, NULL);
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evsel = perf_evlist__first(evlist);
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evsel->attr.comm = 1;
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evsel->attr.disabled = 1;
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evsel->attr.enable_on_exec = 0;
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CHECK__(perf_evlist__open(evlist));
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CHECK__(perf_evlist__mmap(evlist, UINT_MAX));
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pc = evlist->mmap[0].base;
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ret = perf_read_tsc_conversion(pc, &tc);
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if (ret) {
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if (ret == -EOPNOTSUPP) {
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fprintf(stderr, " (not supported)");
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return 0;
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}
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goto out_err;
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}
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perf_evlist__enable(evlist);
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comm1 = "Test COMM 1";
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CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
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test_tsc = rdtsc();
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comm2 = "Test COMM 2";
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CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
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perf_evlist__disable(evlist);
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for (i = 0; i < evlist->nr_mmaps; i++) {
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md = &evlist->mmap[i];
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if (perf_mmap__read_init(md) < 0)
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continue;
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while ((event = perf_mmap__read_event(md)) != NULL) {
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struct perf_sample sample;
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if (event->header.type != PERF_RECORD_COMM ||
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(pid_t)event->comm.pid != getpid() ||
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(pid_t)event->comm.tid != getpid())
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goto next_event;
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if (strcmp(event->comm.comm, comm1) == 0) {
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CHECK__(perf_evsel__parse_sample(evsel, event,
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&sample));
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comm1_time = sample.time;
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}
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if (strcmp(event->comm.comm, comm2) == 0) {
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CHECK__(perf_evsel__parse_sample(evsel, event,
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&sample));
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comm2_time = sample.time;
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}
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next_event:
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perf_mmap__consume(md);
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}
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perf_mmap__read_done(md);
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}
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if (!comm1_time || !comm2_time)
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goto out_err;
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test_time = tsc_to_perf_time(test_tsc, &tc);
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comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
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comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
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pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
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comm1_time, comm1_tsc);
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pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n",
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test_time, test_tsc);
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pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
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comm2_time, comm2_tsc);
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if (test_time <= comm1_time ||
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test_time >= comm2_time)
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goto out_err;
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if (test_tsc <= comm1_tsc ||
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test_tsc >= comm2_tsc)
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goto out_err;
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err = 0;
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out_err:
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perf_evlist__delete(evlist);
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return err;
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}
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