1// SPDX-License-Identifier: GPL-2.0
  2#include <errno.h>
  3#include <inttypes.h>
  4#include <limits.h>
  5#include <stdbool.h>
  6#include <stdio.h>
  7#include <unistd.h>
  8#include <linux/types.h>
  9#include <sys/prctl.h>
 10#include <perf/cpumap.h>
 11#include <perf/evlist.h>
 12#include <perf/mmap.h>
 13
 14#include "debug.h"
 15#include "parse-events.h"
 16#include "evlist.h"
 17#include "evsel.h"
 18#include "thread_map.h"
 19#include "record.h"
 20#include "tsc.h"
 21#include "mmap.h"
 22#include "tests.h"
 23#include "util/sample.h"
 24
 25/*
 26 * Except x86_64/i386 and Arm64, other archs don't support TSC in perf.  Just
 27 * enable the test for x86_64/i386 and Arm64 archs.
 28 */
 29#if defined(__x86_64__) || defined(__i386__) || defined(__aarch64__)
 30#define TSC_IS_SUPPORTED 1
 31#else
 32#define TSC_IS_SUPPORTED 0
 33#endif
 34
 35#define CHECK__(x) {				\
 36	while ((x) < 0) {			\
 37		pr_debug(#x " failed!\n");	\
 38		goto out_err;			\
 39	}					\
 40}
 41
 42#define CHECK_NOT_NULL__(x) {			\
 43	while ((x) == NULL) {			\
 44		pr_debug(#x " failed!\n");	\
 45		goto out_err;			\
 46	}					\
 47}
 48
 49static int test__tsc_is_supported(struct test_suite *test __maybe_unused,
 50				  int subtest __maybe_unused)
 51{
 52	if (!TSC_IS_SUPPORTED) {
 53		pr_debug("Test not supported on this architecture\n");
 54		return TEST_SKIP;
 55	}
 56
 57	return TEST_OK;
 58}
 59
 60/**
 61 * test__perf_time_to_tsc - test converting perf time to TSC.
 62 *
 63 * This function implements a test that checks that the conversion of perf time
 64 * to and from TSC is consistent with the order of events.  If the test passes
 65 * %0 is returned, otherwise %-1 is returned.  If TSC conversion is not
 66 * supported then the test passes but " (not supported)" is printed.
 67 */
 68static int test__perf_time_to_tsc(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 69{
 70	struct record_opts opts = {
 71		.mmap_pages	     = UINT_MAX,
 72		.user_freq	     = UINT_MAX,
 73		.user_interval	     = ULLONG_MAX,
 74		.target		     = {
 75			.uses_mmap   = true,
 76		},
 77		.sample_time	     = true,
 78	};
 79	struct perf_thread_map *threads = NULL;
 80	struct perf_cpu_map *cpus = NULL;
 81	struct evlist *evlist = NULL;
 82	struct evsel *evsel = NULL;
 83	int err = TEST_FAIL, ret, i;
 84	const char *comm1, *comm2;
 85	struct perf_tsc_conversion tc;
 86	struct perf_event_mmap_page *pc;
 87	union perf_event *event;
 88	u64 test_tsc, comm1_tsc, comm2_tsc;
 89	u64 test_time, comm1_time = 0, comm2_time = 0;
 90	struct mmap *md;
 91
 92
 93	threads = thread_map__new(-1, getpid(), UINT_MAX);
 94	CHECK_NOT_NULL__(threads);
 95
 96	cpus = perf_cpu_map__new_online_cpus();
 97	CHECK_NOT_NULL__(cpus);
 98
 99	evlist = evlist__new();
100	CHECK_NOT_NULL__(evlist);
101
102	perf_evlist__set_maps(&evlist->core, cpus, threads);
103
104	CHECK__(parse_event(evlist, "cycles:u"));
105
106	evlist__config(evlist, &opts, NULL);
107
108	/* For hybrid "cycles:u", it creates two events */
109	evlist__for_each_entry(evlist, evsel) {
110		evsel->core.attr.comm = 1;
111		evsel->core.attr.disabled = 1;
112		evsel->core.attr.enable_on_exec = 0;
113	}
114
115	ret = evlist__open(evlist);
116	if (ret < 0) {
117		if (ret == -ENOENT)
118			err = TEST_SKIP;
119		else
120			pr_debug("evlist__open() failed\n");
121		goto out_err;
122	}
123
124	CHECK__(evlist__mmap(evlist, UINT_MAX));
125
126	pc = evlist->mmap[0].core.base;
127	ret = perf_read_tsc_conversion(pc, &tc);
128	if (ret) {
129		if (ret == -EOPNOTSUPP) {
130			pr_debug("perf_read_tsc_conversion is not supported in current kernel\n");
131			err = TEST_SKIP;
132		}
133		goto out_err;
134	}
135
136	evlist__enable(evlist);
137
138	comm1 = "Test COMM 1";
139	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0));
140
141	test_tsc = rdtsc();
142
143	comm2 = "Test COMM 2";
144	CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0));
145
146	evlist__disable(evlist);
147
148	for (i = 0; i < evlist->core.nr_mmaps; i++) {
149		md = &evlist->mmap[i];
150		if (perf_mmap__read_init(&md->core) < 0)
151			continue;
152
153		while ((event = perf_mmap__read_event(&md->core)) != NULL) {
154			struct perf_sample sample;
155
156			if (event->header.type != PERF_RECORD_COMM ||
157			    (pid_t)event->comm.pid != getpid() ||
158			    (pid_t)event->comm.tid != getpid())
159				goto next_event;
160
161			if (strcmp(event->comm.comm, comm1) == 0) {
162				CHECK_NOT_NULL__(evsel = evlist__event2evsel(evlist, event));
163				CHECK__(evsel__parse_sample(evsel, event, &sample));
164				comm1_time = sample.time;
165			}
166			if (strcmp(event->comm.comm, comm2) == 0) {
167				CHECK_NOT_NULL__(evsel = evlist__event2evsel(evlist, event));
168				CHECK__(evsel__parse_sample(evsel, event, &sample));
169				comm2_time = sample.time;
170			}
171next_event:
172			perf_mmap__consume(&md->core);
173		}
174		perf_mmap__read_done(&md->core);
175	}
176
177	if (!comm1_time || !comm2_time)
178		goto out_err;
179
180	test_time = tsc_to_perf_time(test_tsc, &tc);
181	comm1_tsc = perf_time_to_tsc(comm1_time, &tc);
182	comm2_tsc = perf_time_to_tsc(comm2_time, &tc);
183
184	pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n",
185		 comm1_time, comm1_tsc);
186	pr_debug("rdtsc          time %"PRIu64" tsc %"PRIu64"\n",
187		 test_time, test_tsc);
188	pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n",
189		 comm2_time, comm2_tsc);
190
191	if (test_time <= comm1_time ||
192	    test_time >= comm2_time)
193		goto out_err;
194
195	if (test_tsc <= comm1_tsc ||
196	    test_tsc >= comm2_tsc)
197		goto out_err;
198
199	err = TEST_OK;
200
201out_err:
202	evlist__delete(evlist);
203	perf_cpu_map__put(cpus);
204	perf_thread_map__put(threads);
205	return err;
206}
207
208static struct test_case time_to_tsc_tests[] = {
209	TEST_CASE_REASON("TSC support", tsc_is_supported,
210			 "This architecture does not support"),
211	TEST_CASE_REASON("Perf time to TSC", perf_time_to_tsc,
212			 "perf_read_tsc_conversion is not supported"),
213	{ .name = NULL, }
214};
215
216struct test_suite suite__perf_time_to_tsc = {
217	.desc = "Convert perf time to TSC",
218	.test_cases = time_to_tsc_tests,
219};