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 | |
49 | static 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 | */ |
68 | static 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 | } |
171 | next_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 | |
201 | out_err: |
202 | evlist__delete(evlist); |
203 | perf_cpu_map__put(cpus); |
204 | perf_thread_map__put(threads); |
205 | return err; |
206 | } |
207 | |
208 | static 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 | |
216 | struct test_suite suite__perf_time_to_tsc = { |
217 | .desc = "Convert perf time to TSC" , |
218 | .test_cases = time_to_tsc_tests, |
219 | }; |
220 | |