projects/linux·blob master · refs

157 lines · 4.2 KiB

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,instructions sw: context-switch, uncore: [arch dependent] */
14static int types[] = {0, 1, -1};
15static unsigned long configs[] = {0, 3, 0};
16static unsigned long configs_hw[] = {1};
17
18#define NR_UNCORE_PMUS 5
19
20/* Uncore pmus that support more than 3 counters */
21static struct uncore_pmus {
22 const char *name;
23 __u64 config;
24} uncore_pmus[NR_UNCORE_PMUS] = {
25 { "amd_l3", 0x0 },
26 { "amd_df", 0x0 },
27 { "uncore_imc_0", 0x1 }, /* Intel */
28 { "core_imc", 0x318 }, /* PowerPC: core_imc/CPM_STCX_FIN/ */
29 { "hv_24x7", 0x22000000003 }, /* PowerPC: hv_24x7/CPM_STCX_FIN/ */
30};
31
32static int event_open(int type, unsigned long config, int group_fd)
33{
34 struct perf_event_attr attr;
35
36 memset(&attr, 0, sizeof(struct perf_event_attr));
37 attr.type = type;
38 attr.size = sizeof(struct perf_event_attr);
39 attr.config = config;
40 /*
41 * When creating an event group, typically the group leader is
42 * initialized with disabled set to 1 and any child events are
43 * initialized with disabled set to 0. Despite disabled being 0,
44 * the child events will not start until the group leader is
45 * enabled.
46 */
47 attr.disabled = group_fd == -1 ? 1 : 0;
48
49 return sys_perf_event_open(&attr, -1, 0, group_fd, 0);
50}
51
52static int setup_uncore_event(void)
53{
54 struct perf_pmu *pmu = NULL;
55 int i, fd;
56
57 while ((pmu = perf_pmus__scan(pmu)) != NULL) {
58 for (i = 0; i < NR_UNCORE_PMUS; i++) {
59 if (!strcmp(uncore_pmus[i].name, pmu->name)) {
60 pr_debug("Using %s for uncore pmu event\n", pmu->name);
61 types[2] = pmu->type;
62 configs[2] = uncore_pmus[i].config;
63 /*
64 * Check if the chosen uncore pmu event can be
65 * used in the test. For example, incase of accessing
66 * hv_24x7 pmu counters, partition should have
67 * additional permissions. If not, event open will
68 * fail. So check if the event open succeeds
69 * before proceeding.
70 */
71 fd = event_open(types[2], configs[2], -1);
72 if (fd < 0)
73 return -1;
74 close(fd);
75 return 0;
76 }
77 }
78 }
79 return -1;
80}
81
82static int run_test(int i, int j, int k)
83{
84 int erroneous = ((((1 << i) | (1 << j) | (1 << k)) & 5) == 5);
85 int group_fd, sibling_fd1, sibling_fd2;
86
87 group_fd = event_open(types[i], configs[i], -1);
88 if (group_fd == -1)
89 return -1;
90
91 sibling_fd1 = event_open(types[j], configs[j], group_fd);
92 if (sibling_fd1 == -1) {
93 close(group_fd);
94 return erroneous ? 0 : -1;
95 }
96
97 /*
98 * if all three events (leader and two sibling events)
99 * are hardware events, use instructions as one of the
100 * sibling event. There is event constraint in powerpc that
101 * events using same counter cannot be programmed in a group.
102 * Since PERF_COUNT_HW_INSTRUCTIONS is a generic hardware
103 * event and present in all platforms, lets use that.
104 */
105 if (!i && !j && !k)
106 sibling_fd2 = event_open(types[k], configs_hw[k], group_fd);
107 else
108 sibling_fd2 = event_open(types[k], configs[k], group_fd);
109 if (sibling_fd2 == -1) {
110 close(sibling_fd1);
111 close(group_fd);
112 return erroneous ? 0 : -1;
113 }
114
115 close(sibling_fd2);
116 close(sibling_fd1);
117 close(group_fd);
118 return erroneous ? -1 : 0;
119}
120
121static int test__event_groups(struct test_suite *text __maybe_unused, int subtest __maybe_unused)
122{
123 int i, j, k;
124 int ret;
125 int r;
126
127 ret = setup_uncore_event();
128 if (ret || types[2] == -1)
129 return TEST_SKIP;
130
131 ret = TEST_OK;
132 for (i = 0; i < 3; i++) {
133 for (j = 0; j < 3; j++) {
134 for (k = 0; k < 3; k++) {
135 r = run_test(i, j, k);
136 if (r)
137 ret = TEST_FAIL;
138
139 /*
140 * For all three events as HW events, second sibling
141 * event is picked from configs_hw. So print accordingly
142 */
143 if (!i && !j && !k)
144 pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",
145 types[i], configs[i], types[j], configs[j],
146 types[k], configs_hw[k], r ? "Fail" : "Pass");
147 else
148 pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",
149 types[i], configs[i], types[j], configs[j],
150 types[k], configs[k], r ? "Fail" : "Pass");
151 }
152 }
153 }
154 return ret;
155}
156
157DEFINE_SUITE("Event groups", event_groups);