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brintos / linux-shallow public Read only

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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