Commit | Line | Data |
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035827e9 MF |
1 | #include "tests/tests.h" |
2 | #include "perf.h" | |
3 | #include "cloexec.h" | |
4 | #include "debug.h" | |
5 | #include "evlist.h" | |
6 | #include "evsel.h" | |
7 | #include "arch-tests.h" | |
8 | ||
9 | #include <sys/mman.h> | |
10 | #include <string.h> | |
11 | ||
12 | static pid_t spawn(void) | |
13 | { | |
14 | pid_t pid; | |
15 | ||
16 | pid = fork(); | |
17 | if (pid) | |
18 | return pid; | |
19 | ||
cf89813a | 20 | while(1) |
035827e9 MF |
21 | sleep(5); |
22 | return 0; | |
23 | } | |
24 | ||
25 | /* | |
26 | * Create an event group that contains both a sampled hardware | |
27 | * (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then | |
28 | * wait for the hardware perf counter to overflow and generate a PMI, | |
29 | * which triggers an event read for both of the events in the group. | |
30 | * | |
31 | * Since reading Intel CQM event counters requires sending SMP IPIs, the | |
32 | * CQM pmu needs to handle the above situation gracefully, and return | |
33 | * the last read counter value to avoid triggering a WARN_ON_ONCE() in | |
34 | * smp_call_function_many() caused by sending IPIs from NMI context. | |
35 | */ | |
721a1f53 | 36 | int test__intel_cqm_count_nmi_context(int subtest __maybe_unused) |
035827e9 MF |
37 | { |
38 | struct perf_evlist *evlist = NULL; | |
39 | struct perf_evsel *evsel = NULL; | |
40 | struct perf_event_attr pe; | |
41 | int i, fd[2], flag, ret; | |
42 | size_t mmap_len; | |
43 | void *event; | |
44 | pid_t pid; | |
45 | int err = TEST_FAIL; | |
46 | ||
47 | flag = perf_event_open_cloexec_flag(); | |
48 | ||
49 | evlist = perf_evlist__new(); | |
50 | if (!evlist) { | |
51 | pr_debug("perf_evlist__new failed\n"); | |
52 | return TEST_FAIL; | |
53 | } | |
54 | ||
55 | ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL); | |
56 | if (ret) { | |
a831e679 | 57 | pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n"); |
035827e9 MF |
58 | err = TEST_SKIP; |
59 | goto out; | |
60 | } | |
61 | ||
62 | evsel = perf_evlist__first(evlist); | |
63 | if (!evsel) { | |
64 | pr_debug("perf_evlist__first failed\n"); | |
65 | goto out; | |
66 | } | |
67 | ||
68 | memset(&pe, 0, sizeof(pe)); | |
69 | pe.size = sizeof(pe); | |
70 | ||
71 | pe.type = PERF_TYPE_HARDWARE; | |
72 | pe.config = PERF_COUNT_HW_CPU_CYCLES; | |
73 | pe.read_format = PERF_FORMAT_GROUP; | |
74 | ||
75 | pe.sample_period = 128; | |
76 | pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ; | |
77 | ||
78 | pid = spawn(); | |
79 | ||
80 | fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag); | |
81 | if (fd[0] < 0) { | |
82 | pr_debug("failed to open event\n"); | |
83 | goto out; | |
84 | } | |
85 | ||
86 | memset(&pe, 0, sizeof(pe)); | |
87 | pe.size = sizeof(pe); | |
88 | ||
89 | pe.type = evsel->attr.type; | |
90 | pe.config = evsel->attr.config; | |
91 | ||
92 | fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag); | |
93 | if (fd[1] < 0) { | |
94 | pr_debug("failed to open event\n"); | |
95 | goto out; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Pick a power-of-two number of pages + 1 for the meta-data | |
100 | * page (struct perf_event_mmap_page). See tools/perf/design.txt. | |
101 | */ | |
102 | mmap_len = page_size * 65; | |
103 | ||
104 | event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0); | |
105 | if (event == (void *)(-1)) { | |
106 | pr_debug("failed to mmap %d\n", errno); | |
107 | goto out; | |
108 | } | |
109 | ||
110 | sleep(1); | |
111 | ||
112 | err = TEST_OK; | |
113 | ||
114 | munmap(event, mmap_len); | |
115 | ||
116 | for (i = 0; i < 2; i++) | |
117 | close(fd[i]); | |
118 | ||
119 | kill(pid, SIGKILL); | |
120 | wait(NULL); | |
121 | out: | |
122 | perf_evlist__delete(evlist); | |
123 | return err; | |
124 | } |