Release 4.16 tools/perf/arch/s390/util/auxtrace.c
#include <stdbool.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/log2.h>
#include "../../util/evlist.h"
#include "../../util/auxtrace.h"
#include "../../util/evsel.h"
#define PERF_EVENT_CPUM_SF 0xB0000
/* Event: Basic-sampling */
#define PERF_EVENT_CPUM_SF_DIAG 0xBD000
/* Event: Combined-sampling */
#define DEFAULT_AUX_PAGES 128
#define DEFAULT_FREQ 4000
static void cpumsf_free(struct auxtrace_record *itr)
{
free(itr);
}
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static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
return 0;
}
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static int
cpumsf_info_fill(struct auxtrace_record *itr __maybe_unused,
struct perf_session *session __maybe_unused,
struct auxtrace_info_event *auxtrace_info __maybe_unused,
size_t priv_size __maybe_unused)
{
return 0;
}
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static unsigned long
cpumsf_reference(struct auxtrace_record *itr __maybe_unused)
{
return 0;
}
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static int
cpumsf_recording_options(struct auxtrace_record *ar __maybe_unused,
struct perf_evlist *evlist __maybe_unused,
struct record_opts *opts)
{
unsigned int factor = 1;
unsigned int pages;
opts->full_auxtrace = true;
/*
* The AUX buffer size should be set properly to avoid
* overflow of samples if it is not set explicitly.
* DEFAULT_AUX_PAGES is an proper size when sampling frequency
* is DEFAULT_FREQ. It is expected to hold about 1/2 second
* of sampling data. The size used for AUX buffer will scale
* according to the specified frequency and DEFAULT_FREQ.
*/
if (!opts->auxtrace_mmap_pages) {
if (opts->user_freq != UINT_MAX)
factor = (opts->user_freq + DEFAULT_FREQ
- 1) / DEFAULT_FREQ;
pages = DEFAULT_AUX_PAGES * factor;
opts->auxtrace_mmap_pages = roundup_pow_of_two(pages);
}
return 0;
}
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static int
cpumsf_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused,
struct record_opts *opts __maybe_unused,
const char *str __maybe_unused)
{
return 0;
}
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/*
* auxtrace_record__init is called when perf record
* check if the event really need auxtrace
*/
struct auxtrace_record *auxtrace_record__init(struct perf_evlist *evlist,
int *err)
{
struct auxtrace_record *aux;
struct perf_evsel *pos;
int diagnose = 0;
if (evlist->nr_entries == 0)
return NULL;
evlist__for_each_entry(evlist, pos) {
if (pos->attr.config == PERF_EVENT_CPUM_SF_DIAG) {
diagnose = 1;
break;
}
}
if (!diagnose)
return NULL;
/* sampling in diagnose mode. alloc aux buffer */
aux = zalloc(sizeof(*aux));
if (aux == NULL) {
*err = -ENOMEM;
return NULL;
}
aux->parse_snapshot_options = cpumsf_parse_snapshot_options;
aux->recording_options = cpumsf_recording_options;
aux->info_priv_size = cpumsf_info_priv_size;
aux->info_fill = cpumsf_info_fill;
aux->free = cpumsf_free;
aux->reference = cpumsf_reference;
return aux;
}
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