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 20 static void cpumsf_free(struct auxtrace_record *itr) 21 { 22 free(itr); 23 } 24 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 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 42 cpumsf_reference(struct auxtrace_record *itr __maybe_unused) 43 { 44 return 0; 45 } 46 47 static int 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 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 */ 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