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 break; 102 } 103 } 104 105 if (!diagnose) 106 return NULL; 107 108 /* sampling in diagnose mode. alloc aux buffer */ 109 aux = zalloc(sizeof(*aux)); 110 if (aux == NULL) { 111 *err = -ENOMEM; 112 return NULL; 113 } 114 115 aux->parse_snapshot_options = cpumsf_parse_snapshot_options; 116 aux->recording_options = cpumsf_recording_options; 117 aux->info_priv_size = cpumsf_info_priv_size; 118 aux->info_fill = cpumsf_info_fill; 119 aux->free = cpumsf_free; 120 aux->reference = cpumsf_reference; 121 122 return aux; 123 } 124