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
23 static int per_event_excludes(void)
24 {
25 struct event *e, events[4];
26 int i;
27
28 SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07));
29
30 /*
31 * We need to create the events disabled, otherwise the running/enabled
32 * counts don't match up.
33 */
34 e = &events[0];
35 event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
36 PERF_TYPE_HARDWARE, "instructions");
37 e->attr.disabled = 1;
38
39 e = &events[1];
40 event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
41 PERF_TYPE_HARDWARE, "instructions(k)");
42 e->attr.disabled = 1;
43 e->attr.exclude_user = 1;
44 e->attr.exclude_hv = 1;
45
46 e = &events[2];
47 event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
48 PERF_TYPE_HARDWARE, "instructions(h)");
49 e->attr.disabled = 1;
50 e->attr.exclude_user = 1;
51 e->attr.exclude_kernel = 1;
52
53 e = &events[3];
54 event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
55 PERF_TYPE_HARDWARE, "instructions(u)");
56 e->attr.disabled = 1;
57 e->attr.exclude_hv = 1;
58 e->attr.exclude_kernel = 1;
59
60 FAIL_IF(event_open(&events[0]));
61
62 /*
63 * The open here will fail if we don't have per event exclude support,
64 * because the second event has an incompatible set of exclude settings
65 * and we're asking for the events to be in a group.
66 */
67 for (i = 1; i < 4; i++)
68 FAIL_IF(event_open_with_group(&events[i], events[0].fd));
69
70 /*
71 * Even though the above will fail without per-event excludes we keep
72 * testing in order to be thorough.
73 */
74 prctl(PR_TASK_PERF_EVENTS_ENABLE);
75
76 /* Spin for a while */
77 for (i = 0; i < INT_MAX; i++)
78 asm volatile("" : : : "memory");
79
80 prctl(PR_TASK_PERF_EVENTS_DISABLE);
81
82 for (i = 0; i < 4; i++) {
83 FAIL_IF(event_read(&events[i]));
84 event_report(&events[i]);
85 }
86
87 /*
88 * We should see that all events have enabled == running. That
89 * shows that they were all on the PMU at once.
90 */
91 for (i = 0; i < 4; i++)
92 FAIL_IF(events[i].result.running != events[i].result.enabled);
93
94 /*
95 * We can also check that the result for instructions is >= all the
96 * other counts. That's because it is counting all instructions while
97 * the others are counting a subset.
98 */
99 for (i = 1; i < 4; i++)
100 FAIL_IF(events[0].result.value < events[i].result.value);
101
102 for (i = 0; i < 4; i++)
103 event_close(&events[i]);
104
105 return 0;
106 }
107
108 int main(void)
109 {
110 return test_harness(per_event_excludes, "per_event_excludes");
111 }
112
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