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3bd5a5fc AH |
1 | #include <stdio.h> |
2 | #include <sys/types.h> | |
3 | #include <unistd.h> | |
4 | #include <inttypes.h> | |
5 | #include <sys/prctl.h> | |
6 | ||
7 | #include "parse-events.h" | |
8 | #include "evlist.h" | |
9 | #include "evsel.h" | |
10 | #include "thread_map.h" | |
11 | #include "cpumap.h" | |
12 | #include "tests.h" | |
13 | ||
14 | #include "../arch/x86/util/tsc.h" | |
15 | ||
16 | #define CHECK__(x) { \ | |
17 | while ((x) < 0) { \ | |
18 | pr_debug(#x " failed!\n"); \ | |
19 | goto out_err; \ | |
20 | } \ | |
21 | } | |
22 | ||
23 | #define CHECK_NOT_NULL__(x) { \ | |
24 | while ((x) == NULL) { \ | |
25 | pr_debug(#x " failed!\n"); \ | |
26 | goto out_err; \ | |
27 | } \ | |
28 | } | |
29 | ||
30 | static u64 rdtsc(void) | |
31 | { | |
32 | unsigned int low, high; | |
33 | ||
34 | asm volatile("rdtsc" : "=a" (low), "=d" (high)); | |
35 | ||
36 | return low | ((u64)high) << 32; | |
37 | } | |
38 | ||
39 | /** | |
40 | * test__perf_time_to_tsc - test converting perf time to TSC. | |
41 | * | |
42 | * This function implements a test that checks that the conversion of perf time | |
43 | * to and from TSC is consistent with the order of events. If the test passes | |
44 | * %0 is returned, otherwise %-1 is returned. If TSC conversion is not | |
45 | * supported then then the test passes but " (not supported)" is printed. | |
46 | */ | |
47 | int test__perf_time_to_tsc(void) | |
48 | { | |
b4006796 | 49 | struct record_opts opts = { |
3bd5a5fc AH |
50 | .mmap_pages = UINT_MAX, |
51 | .user_freq = UINT_MAX, | |
52 | .user_interval = ULLONG_MAX, | |
53 | .freq = 4000, | |
54 | .target = { | |
55 | .uses_mmap = true, | |
56 | }, | |
57 | .sample_time = true, | |
58 | }; | |
59 | struct thread_map *threads = NULL; | |
60 | struct cpu_map *cpus = NULL; | |
61 | struct perf_evlist *evlist = NULL; | |
62 | struct perf_evsel *evsel = NULL; | |
63 | int err = -1, ret, i; | |
64 | const char *comm1, *comm2; | |
65 | struct perf_tsc_conversion tc; | |
66 | struct perf_event_mmap_page *pc; | |
67 | union perf_event *event; | |
68 | u64 test_tsc, comm1_tsc, comm2_tsc; | |
69 | u64 test_time, comm1_time = 0, comm2_time = 0; | |
70 | ||
71 | threads = thread_map__new(-1, getpid(), UINT_MAX); | |
72 | CHECK_NOT_NULL__(threads); | |
73 | ||
74 | cpus = cpu_map__new(NULL); | |
75 | CHECK_NOT_NULL__(cpus); | |
76 | ||
77 | evlist = perf_evlist__new(); | |
78 | CHECK_NOT_NULL__(evlist); | |
79 | ||
80 | perf_evlist__set_maps(evlist, cpus, threads); | |
81 | ||
82 | CHECK__(parse_events(evlist, "cycles:u")); | |
83 | ||
84 | perf_evlist__config(evlist, &opts); | |
85 | ||
86 | evsel = perf_evlist__first(evlist); | |
87 | ||
88 | evsel->attr.comm = 1; | |
89 | evsel->attr.disabled = 1; | |
90 | evsel->attr.enable_on_exec = 0; | |
91 | ||
92 | CHECK__(perf_evlist__open(evlist)); | |
93 | ||
94 | CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false)); | |
95 | ||
96 | pc = evlist->mmap[0].base; | |
97 | ret = perf_read_tsc_conversion(pc, &tc); | |
98 | if (ret) { | |
99 | if (ret == -EOPNOTSUPP) { | |
100 | fprintf(stderr, " (not supported)"); | |
101 | return 0; | |
102 | } | |
103 | goto out_err; | |
104 | } | |
105 | ||
106 | perf_evlist__enable(evlist); | |
107 | ||
108 | comm1 = "Test COMM 1"; | |
109 | CHECK__(prctl(PR_SET_NAME, (unsigned long)comm1, 0, 0, 0)); | |
110 | ||
111 | test_tsc = rdtsc(); | |
112 | ||
113 | comm2 = "Test COMM 2"; | |
114 | CHECK__(prctl(PR_SET_NAME, (unsigned long)comm2, 0, 0, 0)); | |
115 | ||
116 | perf_evlist__disable(evlist); | |
117 | ||
118 | for (i = 0; i < evlist->nr_mmaps; i++) { | |
119 | while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) { | |
120 | struct perf_sample sample; | |
121 | ||
122 | if (event->header.type != PERF_RECORD_COMM || | |
123 | (pid_t)event->comm.pid != getpid() || | |
124 | (pid_t)event->comm.tid != getpid()) | |
8e50d384 | 125 | goto next_event; |
3bd5a5fc AH |
126 | |
127 | if (strcmp(event->comm.comm, comm1) == 0) { | |
128 | CHECK__(perf_evsel__parse_sample(evsel, event, | |
129 | &sample)); | |
130 | comm1_time = sample.time; | |
131 | } | |
132 | if (strcmp(event->comm.comm, comm2) == 0) { | |
133 | CHECK__(perf_evsel__parse_sample(evsel, event, | |
134 | &sample)); | |
135 | comm2_time = sample.time; | |
136 | } | |
8e50d384 ZZ |
137 | next_event: |
138 | perf_evlist__mmap_consume(evlist, i); | |
3bd5a5fc AH |
139 | } |
140 | } | |
141 | ||
142 | if (!comm1_time || !comm2_time) | |
143 | goto out_err; | |
144 | ||
145 | test_time = tsc_to_perf_time(test_tsc, &tc); | |
146 | comm1_tsc = perf_time_to_tsc(comm1_time, &tc); | |
147 | comm2_tsc = perf_time_to_tsc(comm2_time, &tc); | |
148 | ||
149 | pr_debug("1st event perf time %"PRIu64" tsc %"PRIu64"\n", | |
150 | comm1_time, comm1_tsc); | |
151 | pr_debug("rdtsc time %"PRIu64" tsc %"PRIu64"\n", | |
152 | test_time, test_tsc); | |
153 | pr_debug("2nd event perf time %"PRIu64" tsc %"PRIu64"\n", | |
154 | comm2_time, comm2_tsc); | |
155 | ||
156 | if (test_time <= comm1_time || | |
157 | test_time >= comm2_time) | |
158 | goto out_err; | |
159 | ||
160 | if (test_tsc <= comm1_tsc || | |
161 | test_tsc >= comm2_tsc) | |
162 | goto out_err; | |
163 | ||
164 | err = 0; | |
165 | ||
166 | out_err: | |
167 | if (evlist) { | |
168 | perf_evlist__disable(evlist); | |
169 | perf_evlist__munmap(evlist); | |
170 | perf_evlist__close(evlist); | |
171 | perf_evlist__delete(evlist); | |
172 | } | |
3bd5a5fc AH |
173 | |
174 | return err; | |
175 | } |