[linux-2.6-block.git] / 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);
}

static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused,
				    struct perf_evlist *evlist __maybe_unused)
{
	return 0;
}

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;
}

static unsigned long
cpumsf_reference(struct auxtrace_record *itr __maybe_unused)
{
	return 0;
}

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;
}

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;
}

/*
 * 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;

	*err = 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;
}
Commit	Line	Data
a3f22d50 PH	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
	7	#include "../../util/evlist.h"
	8	#include "../../util/auxtrace.h"
	9	#include "../../util/evsel.h"
	10
	11	#define PERF_EVENT_CPUM_SF 0xB0000 /* Event: Basic-sampling */
	12	#define PERF_EVENT_CPUM_SF_DIAG 0xBD000 /* Event: Combined-sampling */
	13	#define DEFAULT_AUX_PAGES 128
	14	#define DEFAULT_FREQ 4000
	15
	16	static void cpumsf_free(struct auxtrace_record *itr)
	17	{
	18	free(itr);
	19	}
	20
	21	static size_t cpumsf_info_priv_size(struct auxtrace_record *itr __maybe_unused,
	22	struct perf_evlist *evlist __maybe_unused)
	23	{
	24	return 0;
	25	}
	26
	27	static int
	28	cpumsf_info_fill(struct auxtrace_record *itr __maybe_unused,
	29	struct perf_session *session __maybe_unused,
	30	struct auxtrace_info_event *auxtrace_info __maybe_unused,
	31	size_t priv_size __maybe_unused)
	32	{
	33	return 0;
	34	}
	35
	36	static unsigned long
	37	cpumsf_reference(struct auxtrace_record *itr __maybe_unused)
	38	{
	39	return 0;
	40	}
	41
	42	static int
	43	cpumsf_recording_options(struct auxtrace_record *ar __maybe_unused,
	44	struct perf_evlist *evlist __maybe_unused,
	45	struct record_opts *opts)
	46	{
	47	unsigned int factor = 1;
	48	unsigned int pages;
	49
	50	opts->full_auxtrace = true;
	51
	52	/*
	53	* The AUX buffer size should be set properly to avoid
	54	* overflow of samples if it is not set explicitly.
	55	* DEFAULT_AUX_PAGES is an proper size when sampling frequency
	56	* is DEFAULT_FREQ. It is expected to hold about 1/2 second
	57	* of sampling data. The size used for AUX buffer will scale
	58	* according to the specified frequency and DEFAULT_FREQ.
	59	*/
	60	if (!opts->auxtrace_mmap_pages) {
	61	if (opts->user_freq != UINT_MAX)
	62	factor = (opts->user_freq + DEFAULT_FREQ
	63	- 1) / DEFAULT_FREQ;
	64	pages = DEFAULT_AUX_PAGES * factor;
65	opts->auxtrace_mmap_pages = roundup_pow_of_two(pages);
66	}
67
68	return 0;
69	}
70
71	static int
72	cpumsf_parse_snapshot_options(struct auxtrace_record *itr __maybe_unused,
73	struct record_opts *opts __maybe_unused,
74	const char *str __maybe_unused)
75	{
76	return 0;
77	}
78
79	/*
80	* auxtrace_record__init is called when perf record
81	* check if the event really need auxtrace
82	*/
83	struct auxtrace_record auxtrace_record__init(struct perf_evlist evlist,
84	int *err)
85	{
86	struct auxtrace_record *aux;
87	struct perf_evsel *pos;
88	int diagnose = 0;
89
5d9946c3	90	*err = 0;
a3f22d50 PH	91	if (evlist->nr_entries == 0)
	92	return NULL;
	93
	94	evlist__for_each_entry(evlist, pos) {
	95	if (pos->attr.config == PERF_EVENT_CPUM_SF_DIAG) {
	96	diagnose = 1;
	97	break;
	98	}
	99	}
	100
	101	if (!diagnose)
	102	return NULL;
	103
	104	/* sampling in diagnose mode. alloc aux buffer */
	105	aux = zalloc(sizeof(*aux));
	106	if (aux == NULL) {
	107	*err = -ENOMEM;
	108	return NULL;
	109	}
	110
	111	aux->parse_snapshot_options = cpumsf_parse_snapshot_options;
	112	aux->recording_options = cpumsf_recording_options;
	113	aux->info_priv_size = cpumsf_info_priv_size;
	114	aux->info_fill = cpumsf_info_fill;
	115	aux->free = cpumsf_free;
	116	aux->reference = cpumsf_reference;
	117
	118	return aux;
	119	}