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