1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2014, Michael Ellerman, IBM Corp.
4 */
5
6 #define _GNU_SOURCE
7
8 #include <elf.h>
9 #include <limits.h>
10 #include <stdio.h>
11 #include <stdbool.h>
12 #include <string.h>
13 #include <sys/prctl.h>
14
15 #include "event.h"
16 #include "lib.h"
17 #include "utils.h"
18
19 /*
20 * Test that per-event excludes work.
21 */
22
per_event_excludes(void)23 static int per_event_excludes(void)
24 {
25 struct event *e, events[4];
26 char *platform;
27 int i;
28
29 platform = (char *)get_auxv_entry(AT_BASE_PLATFORM);
30 FAIL_IF(!platform);
31 SKIP_IF(strcmp(platform, "power8") != 0);
32
33 /*
34 * We need to create the events disabled, otherwise the running/enabled
35 * counts don't match up.
36 */
37 e = &events[0];
38 event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
39 PERF_TYPE_HARDWARE, "instructions");
40 e->attr.disabled = 1;
41
42 e = &events[1];
43 event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
44 PERF_TYPE_HARDWARE, "instructions(k)");
45 e->attr.disabled = 1;
46 e->attr.exclude_user = 1;
47 e->attr.exclude_hv = 1;
48
49 e = &events[2];
50 event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
51 PERF_TYPE_HARDWARE, "instructions(h)");
52 e->attr.disabled = 1;
53 e->attr.exclude_user = 1;
54 e->attr.exclude_kernel = 1;
55
56 e = &events[3];
57 event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
58 PERF_TYPE_HARDWARE, "instructions(u)");
59 e->attr.disabled = 1;
60 e->attr.exclude_hv = 1;
61 e->attr.exclude_kernel = 1;
62
63 FAIL_IF(event_open(&events[0]));
64
65 /*
66 * The open here will fail if we don't have per event exclude support,
67 * because the second event has an incompatible set of exclude settings
68 * and we're asking for the events to be in a group.
69 */
70 for (i = 1; i < 4; i++)
71 FAIL_IF(event_open_with_group(&events[i], events[0].fd));
72
73 /*
74 * Even though the above will fail without per-event excludes we keep
75 * testing in order to be thorough.
76 */
77 prctl(PR_TASK_PERF_EVENTS_ENABLE);
78
79 /* Spin for a while */
80 for (i = 0; i < INT_MAX; i++)
81 asm volatile("" : : : "memory");
82
83 prctl(PR_TASK_PERF_EVENTS_DISABLE);
84
85 for (i = 0; i < 4; i++) {
86 FAIL_IF(event_read(&events[i]));
87 event_report(&events[i]);
88 }
89
90 /*
91 * We should see that all events have enabled == running. That
92 * shows that they were all on the PMU at once.
93 */
94 for (i = 0; i < 4; i++)
95 FAIL_IF(events[i].result.running != events[i].result.enabled);
96
97 /*
98 * We can also check that the result for instructions is >= all the
99 * other counts. That's because it is counting all instructions while
100 * the others are counting a subset.
101 */
102 for (i = 1; i < 4; i++)
103 FAIL_IF(events[0].result.value < events[i].result.value);
104
105 for (i = 0; i < 4; i++)
106 event_close(&events[i]);
107
108 return 0;
109 }
110
main(void)111 int main(void)
112 {
113 return test_harness(per_event_excludes, "per_event_excludes");
114 }
115