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] */ |
14 | static int types[] = {0, 1, -1}; |
15 | static unsigned long configs[] = {0, 3, 0}; |
16 | |
17 | #define NR_UNCORE_PMUS 5 |
18 | |
19 | /* Uncore pmus that support more than 3 counters */ |
20 | static 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 | |
31 | static 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: &attr, pid: -1, cpu: 0, group_fd, flags: 0); |
49 | } |
50 | |
51 | static 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(type: types[2], config: configs[2], group_fd: -1); |
71 | if (fd < 0) |
72 | return -1; |
73 | close(fd); |
74 | return 0; |
75 | } |
76 | } |
77 | } |
78 | return -1; |
79 | } |
80 | |
81 | static 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(type: types[i], config: configs[i], group_fd: -1); |
87 | if (group_fd == -1) |
88 | return -1; |
89 | |
90 | sibling_fd1 = event_open(type: types[j], config: 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(type: types[k], config: 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 | |
109 | static 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 | |
136 | DEFINE_SUITE("Event groups" , event_groups); |
137 | |