1 #include <errno.h>
2 #include <stdbool.h>
3 #include <stdlib.h>
4 #include <linux/kernel.h>
5 #include <linux/types.h>
6 #include <linux/bitops.h>
7 #include <linux/log2.h>
8 #include <linux/zalloc.h>
9
10 #include "../../util/evlist.h"
11 #include "../../util/auxtrace.h"
12 #include "../../util/evsel.h"
13 #include "../../util/record.h"
14
15 #define PERF_EVENT_CPUM_SF 0xB0000 /* Event: Basic-sampling */
16 #define PERF_EVENT_CPUM_SF_DIAG 0xBD000 /* Event: Combined-sampling */
17 #define DEFAULT_AUX_PAGES 128
18 #define DEFAULT_FREQ 4000
19
cpumsf_free(struct auxtrace_record * itr)20 static void cpumsf_free(struct auxtrace_record *itr)
21 {
22 free(itr);
23 }
24
cpumsf_info_priv_size(struct auxtrace_record * itr __maybe_unused,struct evlist * evlist __maybe_unused)25 static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused,
26 struct evlist *evlist __maybe_unused)
27 {
28 return 0;
29 }
30
31 static int
cpumsf_info_fill(struct auxtrace_record * itr __maybe_unused,struct perf_session * session __maybe_unused,struct perf_record_auxtrace_info * auxtrace_info __maybe_unused,size_t priv_size __maybe_unused)32 cpumsf_info_fill(struct auxtrace_record *itr __maybe_unused,
33 struct perf_session *session __maybe_unused,
34 struct perf_record_auxtrace_info *auxtrace_info __maybe_unused,
35 size_t priv_size __maybe_unused)
36 {
37 auxtrace_info->type = PERF_AUXTRACE_S390_CPUMSF;
38 return 0;
39 }
40
41 static unsigned long
cpumsf_reference(struct auxtrace_record * itr __maybe_unused)42 cpumsf_reference(struct auxtrace_record *itr __maybe_unused)
43 {
44 return 0;
45 }
46
47 static int
cpumsf_recording_options(struct auxtrace_record * ar __maybe_unused,struct evlist * evlist __maybe_unused,struct record_opts * opts)48 cpumsf_recording_options(struct auxtrace_record *ar __maybe_unused,
49 struct evlist *evlist __maybe_unused,
50 struct record_opts *opts)
51 {
52 unsigned int factor = 1;
53 unsigned int pages;
54
55 opts->full_auxtrace = true;
56
57 /*
58 * The AUX buffer size should be set properly to avoid
59 * overflow of samples if it is not set explicitly.
60 * DEFAULT_AUX_PAGES is an proper size when sampling frequency
61 * is DEFAULT_FREQ. It is expected to hold about 1/2 second
62 * of sampling data. The size used for AUX buffer will scale
63 * according to the specified frequency and DEFAULT_FREQ.
64 */
65 if (!opts->auxtrace_mmap_pages) {
66 if (opts->user_freq != UINT_MAX)
67 factor = (opts->user_freq + DEFAULT_FREQ
68 - 1) / DEFAULT_FREQ;
69 pages = DEFAULT_AUX_PAGES * factor;
70 opts->auxtrace_mmap_pages = roundup_pow_of_two(pages);
71 }
72
73 return 0;
74 }
75
76 static int
cpumsf_parse_snapshot_options(struct auxtrace_record * itr __maybe_unused,struct record_opts * opts __maybe_unused,const char * str __maybe_unused)77 cpumsf_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused,
78 struct record_opts *opts __maybe_unused,
79 const char *str __maybe_unused)
80 {
81 return 0;
82 }
83
84 /*
85 * auxtrace_record__init is called when perf record
86 * check if the event really need auxtrace
87 */
auxtrace_record__init(struct evlist * evlist,int * err)88 struct auxtrace_record *auxtrace_record__init(struct evlist *evlist,
89 int *err)
90 {
91 struct auxtrace_record *aux;
92 struct evsel *pos;
93 int diagnose = 0;
94
95 *err = 0;
96 if (evlist->core.nr_entries == 0)
97 return NULL;
98
99 evlist__for_each_entry(evlist, pos) {
100 if (pos->core.attr.config == PERF_EVENT_CPUM_SF_DIAG) {
101 diagnose = 1;
102 pos->needs_auxtrace_mmap = true;
103 break;
104 }
105 }
106
107 if (!diagnose)
108 return NULL;
109
110 /* sampling in diagnose mode. alloc aux buffer */
111 aux = zalloc(sizeof(*aux));
112 if (aux == NULL) {
113 *err = -ENOMEM;
114 return NULL;
115 }
116
117 aux->parse_snapshot_options = cpumsf_parse_snapshot_options;
118 aux->recording_options = cpumsf_recording_options;
119 aux->info_priv_size = cpumsf_info_priv_size;
120 aux->info_fill = cpumsf_info_fill;
121 aux->free = cpumsf_free;
122 aux->reference = cpumsf_reference;
123
124 return aux;
125 }
126