1// SPDX-License-Identifier: GPL-2.0
2#include <string.h>
3#include <unistd.h>
4#include <stdio.h>
5#include "linux/perf_event.h"
6#include "tests.h"
7#include "debug.h"
8#include "pmu.h"
9#include "pmus.h"
10#include "header.h"
11#include "../perf-sys.h"
12
13/* hw: cycles, sw: context-switch, uncore: [arch dependent] */
14static int types[] = {0, 1, -1};
15static unsigned long configs[] = {0, 3, 0};
16
17#define NR_UNCORE_PMUS 5
18
19/* Uncore pmus that support more than 3 counters */
20static struct uncore_pmus {
21	const char *name;
22	__u64 config;
23} uncore_pmus[NR_UNCORE_PMUS] = {
24	{ "amd_l3", 0x0 },
25	{ "amd_df", 0x0 },
26	{ "uncore_imc_0", 0x1 },         /* Intel */
27	{ "core_imc", 0x318 },           /* PowerPC: core_imc/CPM_STCX_FIN/ */
28	{ "hv_24x7", 0x22000000003 },    /* PowerPC: hv_24x7/CPM_STCX_FIN/ */
29};
30
31static int event_open(int type, unsigned long config, int group_fd)
32{
33	struct perf_event_attr attr;
34
35	memset(&attr, 0, sizeof(struct perf_event_attr));
36	attr.type = type;
37	attr.size = sizeof(struct perf_event_attr);
38	attr.config = config;
39	/*
40	 * When creating an event group, typically the group leader is
41	 * initialized with disabled set to 1 and any child events are
42	 * initialized with disabled set to 0. Despite disabled being 0,
43	 * the child events will not start until the group leader is
44	 * enabled.
45	 */
46	attr.disabled = group_fd == -1 ? 1 : 0;
47
48	return sys_perf_event_open(&attr, -1, 0, group_fd, 0);
49}
50
51static int setup_uncore_event(void)
52{
53	struct perf_pmu *pmu = NULL;
54	int i, fd;
55
56	while ((pmu = perf_pmus__scan(pmu)) != NULL) {
57		for (i = 0; i < NR_UNCORE_PMUS; i++) {
58			if (!strcmp(uncore_pmus[i].name, pmu->name)) {
59				pr_debug("Using %s for uncore pmu event\n", pmu->name);
60				types[2] = pmu->type;
61				configs[2] = uncore_pmus[i].config;
62				/*
63				 * Check if the chosen uncore pmu event can be
64				 * used in the test. For example, incase of accessing
65				 * hv_24x7 pmu counters, partition should have
66				 * additional permissions. If not, event open will
67				 * fail. So check if the event open succeeds
68				 * before proceeding.
69				 */
70				fd = event_open(types[2], configs[2], -1);
71				if (fd < 0)
72					return -1;
73				close(fd);
74				return 0;
75			}
76		}
77	}
78	return -1;
79}
80
81static int run_test(int i, int j, int k)
82{
83	int erroneous = ((((1 << i) | (1 << j) | (1 << k)) & 5) == 5);
84	int group_fd, sibling_fd1, sibling_fd2;
85
86	group_fd = event_open(types[i], configs[i], -1);
87	if (group_fd == -1)
88		return -1;
89
90	sibling_fd1 = event_open(types[j], configs[j], group_fd);
91	if (sibling_fd1 == -1) {
92		close(group_fd);
93		return erroneous ? 0 : -1;
94	}
95
96	sibling_fd2 = event_open(types[k], configs[k], group_fd);
97	if (sibling_fd2 == -1) {
98		close(sibling_fd1);
99		close(group_fd);
100		return erroneous ? 0 : -1;
101	}
102
103	close(sibling_fd2);
104	close(sibling_fd1);
105	close(group_fd);
106	return erroneous ? -1 : 0;
107}
108
109static int test__event_groups(struct test_suite *text __maybe_unused, int subtest __maybe_unused)
110{
111	int i, j, k;
112	int ret;
113	int r;
114
115	ret = setup_uncore_event();
116	if (ret || types[2] == -1)
117		return TEST_SKIP;
118
119	ret = TEST_OK;
120	for (i = 0; i < 3; i++) {
121		for (j = 0; j < 3; j++) {
122			for (k = 0; k < 3; k++) {
123				r = run_test(i, j, k);
124				if (r)
125					ret = TEST_FAIL;
126
127				pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",
128					 types[i], configs[i], types[j], configs[j],
129					 types[k], configs[k], r ? "Fail" : "Pass");
130			}
131		}
132	}
133	return ret;
134}
135
136DEFINE_SUITE("Event groups", event_groups);
137