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