125 lines · c
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 12817#define DEFAULT_FREQ 400018 19static void cpumsf_free(struct auxtrace_record *itr)20{21 free(itr);22}23 24static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused,25 struct evlist *evlist __maybe_unused)26{27 return 0;28}29 30static int31cpumsf_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 40static unsigned long41cpumsf_reference(struct auxtrace_record *itr __maybe_unused)42{43 return 0;44}45 46static int47cpumsf_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 avoid58 * overflow of samples if it is not set explicitly.59 * DEFAULT_AUX_PAGES is an proper size when sampling frequency60 * is DEFAULT_FREQ. It is expected to hold about 1/2 second61 * of sampling data. The size used for AUX buffer will scale62 * 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_FREQ67 - 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 75static int76cpumsf_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 record85 * check if the event really need auxtrace86 */87struct 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 pos->needs_auxtrace_mmap = true;102 break;103 }104 }105 106 if (!diagnose)107 return NULL;108 109 /* sampling in diagnose mode. alloc aux buffer */110 aux = zalloc(sizeof(*aux));111 if (aux == NULL) {112 *err = -ENOMEM;113 return NULL;114 }115 116 aux->parse_snapshot_options = cpumsf_parse_snapshot_options;117 aux->recording_options = cpumsf_recording_options;118 aux->info_priv_size = cpumsf_info_priv_size;119 aux->info_fill = cpumsf_info_fill;120 aux->free = cpumsf_free;121 aux->reference = cpumsf_reference;122 123 return aux;124}125