1 #include <stdbool.h>
2 #include <stdlib.h>
3 #include <linux/kernel.h>
4 #include <linux/types.h>
5 #include <linux/bitops.h>
6 #include <linux/log2.h>
7 #include <linux/zalloc.h>
8
9 #include "../../util/evlist.h"
10 #include "../../util/auxtrace.h"
11 #include "../../util/evsel.h"
12 #include "../../util/record.h"
13
14 #define PERF_EVENT_CPUM_SF 0xB0000 /* Event: Basic-sampling */
15 #define PERF_EVENT_CPUM_SF_DIAG 0xBD000 /* Event: Combined-sampling */
16 #define DEFAULT_AUX_PAGES 128
17 #define DEFAULT_FREQ 4000
18
19 static void cpumsf_free(struct auxtrace_record *itr)
20 {
21 free(itr);
22 }
23
24 static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused,
25 struct evlist *evlist __maybe_unused)
26 {
27 return 0;
28 }
29
30 static int
31 cpumsf_info_fill(struct auxtrace_record *itr __maybe_unused,
32 struct perf_session *session __maybe_unused,
33 struct perf_record_auxtrace_info *auxtrace_info __maybe_unused,
34 size_t priv_size __maybe_unused)
35 {
36 auxtrace_info->type = PERF_AUXTRACE_S390_CPUMSF;
37 return 0;
38 }
39
40 static unsigned long
41 cpumsf_reference(struct auxtrace_record *itr __maybe_unused)
42 {
43 return 0;
44 }
45
46 static int
47 cpumsf_recording_options(struct auxtrace_record *ar __maybe_unused,
48 struct evlist *evlist __maybe_unused,
49 struct record_opts *opts)
50 {
51 unsigned int factor = 1;
52 unsigned int pages;
53
54 opts->full_auxtrace = true;
55
56 /*
57 * The AUX buffer size should be set properly to avoid
58 * overflow of samples if it is not set explicitly.
59 * DEFAULT_AUX_PAGES is an proper size when sampling frequency
60 * is DEFAULT_FREQ. It is expected to hold about 1/2 second
61 * of sampling data. The size used for AUX buffer will scale
62 * according to the specified frequency and DEFAULT_FREQ.
63 */
64 if (!opts->auxtrace_mmap_pages) {
65 if (opts->user_freq != UINT_MAX)
66 factor = (opts->user_freq + DEFAULT_FREQ
67 - 1) / DEFAULT_FREQ;
68 pages = DEFAULT_AUX_PAGES * factor;
69 opts->auxtrace_mmap_pages = roundup_pow_of_two(pages);
70 }
71
72 return 0;
73 }
74
75 static int
76 cpumsf_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused,
77 struct record_opts *opts __maybe_unused,
78 const char *str __maybe_unused)
79 {
80 return 0;
81 }
82
83 /*
84 * auxtrace_record__init is called when perf record
85 * check if the event really need auxtrace
86 */
87 struct auxtrace_record *auxtrace_record__init(struct evlist *evlist,
88 int *err)
89 {
90 struct auxtrace_record *aux;
91 struct evsel *pos;
92 int diagnose = 0;
93
94 *err = 0;
95 if (evlist->core.nr_entries == 0)
96 return NULL;
97
98 evlist__for_each_entry(evlist, pos) {
99 if (pos->core.attr.config == PERF_EVENT_CPUM_SF_DIAG) {
100 diagnose = 1;
101 pos->needs_auxtrace_mmap = true;
102 break;
103 }
104 }
105
106 if (!diagnose)
107 return NULL;
108
109 /* sampling in diagnose mode. alloc aux buffer */
110 aux = zalloc(sizeof(*aux));
111 if (aux == NULL) {
112 *err = -ENOMEM;
113 return NULL;
114 }
115
116 aux->parse_snapshot_options = cpumsf_parse_snapshot_options;
117 aux->recording_options = cpumsf_recording_options;
118 aux->info_priv_size = cpumsf_info_priv_size;
119 aux->info_fill = cpumsf_info_fill;
120 aux->free = cpumsf_free;
121 aux->reference = cpumsf_reference;
122
123 return aux;
124 }
125
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