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218 lines
5.4 KiB
218 lines
5.4 KiB
// 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 <limits.h> |
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#include <stdbool.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 <perf/cpumap.h> |
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#include <perf/evlist.h> |
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#include <perf/mmap.h> |
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#include "debug.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 "record.h" |
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#include "tsc.h" |
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#include "mmap.h" |
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#include "tests.h" |
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/* |
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* Except x86_64/i386 and Arm64, other archs don't support TSC in perf. Just |
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* enable the test for x86_64/i386 and Arm64 archs. |
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*/ |
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#if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__) |
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#define TSC_IS_SUPPORTED 1 |
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#else |
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#define TSC_IS_SUPPORTED 0 |
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#endif |
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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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static int test__tsc_is_supported(struct test_suite *test __maybe_unused, |
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int subtest __maybe_unused) |
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{ |
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if (!TSC_IS_SUPPORTED) { |
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pr_debug("Test not supported on this architecture\n"); |
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return TEST_SKIP; |
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} |
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return TEST_OK; |
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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 the test passes but " (not supported)" is printed. |
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*/ |
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static int test__perf_time_to_tsc(struct test_suite *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 perf_thread_map *threads = NULL; |
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struct perf_cpu_map *cpus = NULL; |
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struct evlist *evlist = NULL; |
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struct evsel *evsel = NULL; |
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int err = TEST_FAIL, 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 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 = perf_cpu_map__new(NULL); |
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CHECK_NOT_NULL__(cpus); |
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evlist = evlist__new(); |
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CHECK_NOT_NULL__(evlist); |
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perf_evlist__set_maps(&evlist->core, cpus, threads); |
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CHECK__(parse_event(evlist, "cycles:u")); |
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evlist__config(evlist, &opts, NULL); |
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/* For hybrid "cycles:u", it creates two events */ |
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evlist__for_each_entry(evlist, evsel) { |
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evsel->core.attr.comm = 1; |
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evsel->core.attr.disabled = 1; |
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evsel->core.attr.enable_on_exec = 0; |
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} |
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ret = evlist__open(evlist); |
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if (ret < 0) { |
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if (ret == -ENOENT) |
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err = TEST_SKIP; |
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else |
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pr_debug("evlist__open() failed\n"); |
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goto out_err; |
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} |
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CHECK__(evlist__mmap(evlist, UINT_MAX)); |
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pc = evlist->mmap[0].core.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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pr_debug("perf_read_tsc_conversion is not supported in current kernel\n"); |
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err = TEST_SKIP; |
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} |
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goto out_err; |
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} |
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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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evlist__disable(evlist); |
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for (i = 0; i < evlist->core.nr_mmaps; i++) { |
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md = &evlist->mmap[i]; |
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if (perf_mmap__read_init(&md->core) < 0) |
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continue; |
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while ((event = perf_mmap__read_event(&md->core)) != 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_NOT_NULL__(evsel = evlist__event2evsel(evlist, event)); |
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CHECK__(evsel__parse_sample(evsel, event, &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_NOT_NULL__(evsel = evlist__event2evsel(evlist, event)); |
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CHECK__(evsel__parse_sample(evsel, event, &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->core); |
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} |
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perf_mmap__read_done(&md->core); |
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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 = TEST_OK; |
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out_err: |
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evlist__delete(evlist); |
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perf_cpu_map__put(cpus); |
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perf_thread_map__put(threads); |
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return err; |
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} |
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static struct test_case time_to_tsc_tests[] = { |
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TEST_CASE_REASON("TSC support", tsc_is_supported, |
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"This architecture does not support"), |
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TEST_CASE_REASON("Perf time to TSC", perf_time_to_tsc, |
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"perf_read_tsc_conversion is not supported"), |
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{ .name = NULL, } |
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}; |
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struct test_suite suite__perf_time_to_tsc = { |
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.desc = "Convert perf time to TSC", |
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.test_cases = time_to_tsc_tests, |
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};
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