tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2#include <stdarg.h>
3#include <stdio.h>
4#include <linux/perf_event.h>
5#include <perf/cpumap.h>
6#include <perf/threadmap.h>
7#include <perf/evsel.h>
8#include <internal/tests.h>
9#include "tests.h"
10
11static int libperf_print(enum libperf_print_level level,
12 const char *fmt, va_list ap)
13{
14 return vfprintf(stderr, fmt, ap);
15}
16
17static int test_stat_cpu(void)
18{
19 struct perf_cpu_map *cpus;
20 struct perf_evsel *evsel;
21 struct perf_event_attr attr = {
22 .type = PERF_TYPE_SOFTWARE,
23 .config = PERF_COUNT_SW_CPU_CLOCK,
24 };
25 int err, idx;
26
27 cpus = perf_cpu_map__new(NULL);
28 __T("failed to create cpus", cpus);
29
30 evsel = perf_evsel__new(&attr);
31 __T("failed to create evsel", evsel);
32
33 err = perf_evsel__open(evsel, cpus, NULL);
34 __T("failed to open evsel", err == 0);
35
36 for (idx = 0; idx < perf_cpu_map__nr(cpus); idx++) {
37 struct perf_counts_values counts = { .val = 0 };
38
39 perf_evsel__read(evsel, idx, 0, &counts);
40 __T("failed to read value for evsel", counts.val != 0);
41 }
42
43 perf_evsel__close(evsel);
44 perf_evsel__delete(evsel);
45
46 perf_cpu_map__put(cpus);
47 return 0;
48}
49
50static int test_stat_thread(void)
51{
52 struct perf_counts_values counts = { .val = 0 };
53 struct perf_thread_map *threads;
54 struct perf_evsel *evsel;
55 struct perf_event_attr attr = {
56 .type = PERF_TYPE_SOFTWARE,
57 .config = PERF_COUNT_SW_TASK_CLOCK,
58 };
59 int err;
60
61 threads = perf_thread_map__new_dummy();
62 __T("failed to create threads", threads);
63
64 perf_thread_map__set_pid(threads, 0, 0);
65
66 evsel = perf_evsel__new(&attr);
67 __T("failed to create evsel", evsel);
68
69 err = perf_evsel__open(evsel, NULL, threads);
70 __T("failed to open evsel", err == 0);
71
72 perf_evsel__read(evsel, 0, 0, &counts);
73 __T("failed to read value for evsel", counts.val != 0);
74
75 perf_evsel__close(evsel);
76 perf_evsel__delete(evsel);
77
78 perf_thread_map__put(threads);
79 return 0;
80}
81
82static int test_stat_thread_enable(void)
83{
84 struct perf_counts_values counts = { .val = 0 };
85 struct perf_thread_map *threads;
86 struct perf_evsel *evsel;
87 struct perf_event_attr attr = {
88 .type = PERF_TYPE_SOFTWARE,
89 .config = PERF_COUNT_SW_TASK_CLOCK,
90 .disabled = 1,
91 };
92 int err;
93
94 threads = perf_thread_map__new_dummy();
95 __T("failed to create threads", threads);
96
97 perf_thread_map__set_pid(threads, 0, 0);
98
99 evsel = perf_evsel__new(&attr);
100 __T("failed to create evsel", evsel);
101
102 err = perf_evsel__open(evsel, NULL, threads);
103 __T("failed to open evsel", err == 0);
104
105 perf_evsel__read(evsel, 0, 0, &counts);
106 __T("failed to read value for evsel", counts.val == 0);
107
108 err = perf_evsel__enable(evsel);
109 __T("failed to enable evsel", err == 0);
110
111 perf_evsel__read(evsel, 0, 0, &counts);
112 __T("failed to read value for evsel", counts.val != 0);
113
114 err = perf_evsel__disable(evsel);
115 __T("failed to enable evsel", err == 0);
116
117 perf_evsel__close(evsel);
118 perf_evsel__delete(evsel);
119
120 perf_thread_map__put(threads);
121 return 0;
122}
123
124static int test_stat_user_read(int event)
125{
126 struct perf_counts_values counts = { .val = 0 };
127 struct perf_thread_map *threads;
128 struct perf_evsel *evsel;
129 struct perf_event_mmap_page *pc;
130 struct perf_event_attr attr = {
131 .type = PERF_TYPE_HARDWARE,
132 .config = event,
133#ifdef __aarch64__
134 .config1 = 0x2, /* Request user access */
135#endif
136 };
137 int err, i;
138
139 threads = perf_thread_map__new_dummy();
140 __T("failed to create threads", threads);
141
142 perf_thread_map__set_pid(threads, 0, 0);
143
144 evsel = perf_evsel__new(&attr);
145 __T("failed to create evsel", evsel);
146
147 err = perf_evsel__open(evsel, NULL, threads);
148 __T("failed to open evsel", err == 0);
149
150 err = perf_evsel__mmap(evsel, 0);
151 __T("failed to mmap evsel", err == 0);
152
153 pc = perf_evsel__mmap_base(evsel, 0, 0);
154 __T("failed to get mmapped address", pc);
155
156#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
157 __T("userspace counter access not supported", pc->cap_user_rdpmc);
158 __T("userspace counter access not enabled", pc->index);
159 __T("userspace counter width not set", pc->pmc_width >= 32);
160#endif
161
162 perf_evsel__read(evsel, 0, 0, &counts);
163 __T("failed to read value for evsel", counts.val != 0);
164
165 for (i = 0; i < 5; i++) {
166 volatile int count = 0x10000 << i;
167 __u64 start, end, last = 0;
168
169 __T_VERBOSE("\tloop = %u, ", count);
170
171 perf_evsel__read(evsel, 0, 0, &counts);
172 start = counts.val;
173
174 while (count--) ;
175
176 perf_evsel__read(evsel, 0, 0, &counts);
177 end = counts.val;
178
179 __T("invalid counter data", (end - start) > last);
180 last = end - start;
181 __T_VERBOSE("count = %llu\n", end - start);
182 }
183
184 perf_evsel__munmap(evsel);
185 perf_evsel__close(evsel);
186 perf_evsel__delete(evsel);
187
188 perf_thread_map__put(threads);
189 return 0;
190}
191
192int test_evsel(int argc, char **argv)
193{
194 __T_START;
195
196 libperf_init(libperf_print);
197
198 test_stat_cpu();
199 test_stat_thread();
200 test_stat_thread_enable();
201 test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS);
202 test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES);
203
204 __T_END;
205 return tests_failed == 0 ? 0 : -1;
206}