]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
035827e9 MF |
2 | #include "tests/tests.h" |
3 | #include "perf.h" | |
4 | #include "cloexec.h" | |
5 | #include "debug.h" | |
6 | #include "evlist.h" | |
7 | #include "evsel.h" | |
8 | #include "arch-tests.h" | |
9 | ||
9607ad3a | 10 | #include <signal.h> |
035827e9 | 11 | #include <sys/mman.h> |
4208735d | 12 | #include <sys/wait.h> |
a43783ae | 13 | #include <errno.h> |
035827e9 MF |
14 | #include <string.h> |
15 | ||
16 | static pid_t spawn(void) | |
17 | { | |
18 | pid_t pid; | |
19 | ||
20 | pid = fork(); | |
21 | if (pid) | |
22 | return pid; | |
23 | ||
cf89813a | 24 | while(1) |
035827e9 MF |
25 | sleep(5); |
26 | return 0; | |
27 | } | |
28 | ||
29 | /* | |
30 | * Create an event group that contains both a sampled hardware | |
31 | * (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then | |
32 | * wait for the hardware perf counter to overflow and generate a PMI, | |
33 | * which triggers an event read for both of the events in the group. | |
34 | * | |
35 | * Since reading Intel CQM event counters requires sending SMP IPIs, the | |
36 | * CQM pmu needs to handle the above situation gracefully, and return | |
37 | * the last read counter value to avoid triggering a WARN_ON_ONCE() in | |
38 | * smp_call_function_many() caused by sending IPIs from NMI context. | |
39 | */ | |
81f17c90 | 40 | int test__intel_cqm_count_nmi_context(struct test *test __maybe_unused, int subtest __maybe_unused) |
035827e9 MF |
41 | { |
42 | struct perf_evlist *evlist = NULL; | |
43 | struct perf_evsel *evsel = NULL; | |
44 | struct perf_event_attr pe; | |
45 | int i, fd[2], flag, ret; | |
46 | size_t mmap_len; | |
47 | void *event; | |
48 | pid_t pid; | |
49 | int err = TEST_FAIL; | |
50 | ||
51 | flag = perf_event_open_cloexec_flag(); | |
52 | ||
53 | evlist = perf_evlist__new(); | |
54 | if (!evlist) { | |
55 | pr_debug("perf_evlist__new failed\n"); | |
56 | return TEST_FAIL; | |
57 | } | |
58 | ||
59 | ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL); | |
60 | if (ret) { | |
a831e679 | 61 | pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n"); |
035827e9 MF |
62 | err = TEST_SKIP; |
63 | goto out; | |
64 | } | |
65 | ||
66 | evsel = perf_evlist__first(evlist); | |
67 | if (!evsel) { | |
68 | pr_debug("perf_evlist__first failed\n"); | |
69 | goto out; | |
70 | } | |
71 | ||
72 | memset(&pe, 0, sizeof(pe)); | |
73 | pe.size = sizeof(pe); | |
74 | ||
75 | pe.type = PERF_TYPE_HARDWARE; | |
76 | pe.config = PERF_COUNT_HW_CPU_CYCLES; | |
77 | pe.read_format = PERF_FORMAT_GROUP; | |
78 | ||
79 | pe.sample_period = 128; | |
80 | pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ; | |
81 | ||
82 | pid = spawn(); | |
83 | ||
84 | fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag); | |
85 | if (fd[0] < 0) { | |
86 | pr_debug("failed to open event\n"); | |
87 | goto out; | |
88 | } | |
89 | ||
90 | memset(&pe, 0, sizeof(pe)); | |
91 | pe.size = sizeof(pe); | |
92 | ||
93 | pe.type = evsel->attr.type; | |
94 | pe.config = evsel->attr.config; | |
95 | ||
96 | fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag); | |
97 | if (fd[1] < 0) { | |
98 | pr_debug("failed to open event\n"); | |
99 | goto out; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Pick a power-of-two number of pages + 1 for the meta-data | |
104 | * page (struct perf_event_mmap_page). See tools/perf/design.txt. | |
105 | */ | |
106 | mmap_len = page_size * 65; | |
107 | ||
108 | event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0); | |
109 | if (event == (void *)(-1)) { | |
110 | pr_debug("failed to mmap %d\n", errno); | |
111 | goto out; | |
112 | } | |
113 | ||
114 | sleep(1); | |
115 | ||
116 | err = TEST_OK; | |
117 | ||
118 | munmap(event, mmap_len); | |
119 | ||
120 | for (i = 0; i < 2; i++) | |
121 | close(fd[i]); | |
122 | ||
123 | kill(pid, SIGKILL); | |
124 | wait(NULL); | |
125 | out: | |
126 | perf_evlist__delete(evlist); | |
127 | return err; | |
128 | } |