[deliverable/linux.git] / tools / perf / util / header.c

#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

#include "util.h"
#include "header.h"

/*
 * Create new perf.data header attribute:
 */
struct perf_header_attr *perf_header_attr__new(struct perf_counter_attr *attr)
{
	struct perf_header_attr *self = malloc(sizeof(*self));

	if (!self)
		die("nomem");

	self->attr = *attr;
	self->ids = 0;
	self->size = 1;
	self->id = malloc(sizeof(u64));

	if (!self->id)
		die("nomem");

	return self;
}

void perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
{
	int pos = self->ids;

	self->ids++;
	if (self->ids > self->size) {
		self->size *= 2;
		self->id = realloc(self->id, self->size * sizeof(u64));
		if (!self->id)
			die("nomem");
	}
	self->id[pos] = id;
}

/*
 * Create new perf.data header:
 */
struct perf_header *perf_header__new(void)
{
	struct perf_header *self = malloc(sizeof(*self));

	if (!self)
		die("nomem");

	self->frozen = 0;

	self->attrs = 0;
	self->size = 1;
	self->attr = malloc(sizeof(void *));

	if (!self->attr)
		die("nomem");

	self->data_offset = 0;
	self->data_size = 0;

	return self;
}

void perf_header__add_attr(struct perf_header *self,
			   struct perf_header_attr *attr)
{
	int pos = self->attrs;

	if (self->frozen)
		die("frozen");

	self->attrs++;
	if (self->attrs > self->size) {
		self->size *= 2;
		self->attr = realloc(self->attr, self->size * sizeof(void *));
		if (!self->attr)
			die("nomem");
	}
	self->attr[pos] = attr;
}

#define MAX_EVENT_NAME 64

struct perf_trace_event_type {
	u64	event_id;
	char	name[MAX_EVENT_NAME];
};

static int event_count;
static struct perf_trace_event_type *events;

void perf_header__push_event(u64 id, const char *name)
{
	if (strlen(name) > MAX_EVENT_NAME)
		printf("Event %s will be truncated\n", name);

	if (!events) {
		events = malloc(sizeof(struct perf_trace_event_type));
		if (!events)
			die("nomem");
	} else {
		events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type));
		if (!events)
			die("nomem");
	}
	memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
	events[event_count].event_id = id;
	strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
	event_count++;
}

char *perf_header__find_event(u64 id)
{
	int i;
	for (i = 0 ; i < event_count; i++) {
		if (events[i].event_id == id)
			return events[i].name;
	}
	return NULL;
}

static const char *__perf_magic = "PERFFILE";

#define PERF_MAGIC	(*(u64 *)__perf_magic)

struct perf_file_section {
	u64 offset;
	u64 size;
};

struct perf_file_attr {
	struct perf_counter_attr	attr;
	struct perf_file_section	ids;
};

struct perf_file_header {
	u64				magic;
	u64				size;
	u64				attr_size;
	struct perf_file_section	attrs;
	struct perf_file_section	data;
	struct perf_file_section	event_types;
};

static void do_write(int fd, void *buf, size_t size)
{
	while (size) {
		int ret = write(fd, buf, size);

		if (ret < 0)
			die("failed to write");

		size -= ret;
		buf += ret;
	}
}

void perf_header__write(struct perf_header *self, int fd)
{
	struct perf_file_header f_header;
	struct perf_file_attr   f_attr;
	struct perf_header_attr	*attr;
	int i;

	lseek(fd, sizeof(f_header), SEEK_SET);


	for (i = 0; i < self->attrs; i++) {
		attr = self->attr[i];

		attr->id_offset = lseek(fd, 0, SEEK_CUR);
		do_write(fd, attr->id, attr->ids * sizeof(u64));
	}


	self->attr_offset = lseek(fd, 0, SEEK_CUR);

	for (i = 0; i < self->attrs; i++) {
		attr = self->attr[i];

		f_attr = (struct perf_file_attr){
			.attr = attr->attr,
			.ids  = {
				.offset = attr->id_offset,
				.size   = attr->ids * sizeof(u64),
			}
		};
		do_write(fd, &f_attr, sizeof(f_attr));
	}

	self->event_offset = lseek(fd, 0, SEEK_CUR);
	self->event_size = event_count * sizeof(struct perf_trace_event_type);
	if (events)
		do_write(fd, events, self->event_size);


	self->data_offset = lseek(fd, 0, SEEK_CUR);

	f_header = (struct perf_file_header){
		.magic	   = PERF_MAGIC,
		.size	   = sizeof(f_header),
		.attr_size = sizeof(f_attr),
		.attrs = {
			.offset = self->attr_offset,
			.size   = self->attrs * sizeof(f_attr),
		},
		.data = {
			.offset = self->data_offset,
			.size	= self->data_size,
		},
		.event_types = {
			.offset = self->event_offset,
			.size	= self->event_size,
		},
	};

	lseek(fd, 0, SEEK_SET);
	do_write(fd, &f_header, sizeof(f_header));
	lseek(fd, self->data_offset + self->data_size, SEEK_SET);

	self->frozen = 1;
}

static void do_read(int fd, void *buf, size_t size)
{
	while (size) {
		int ret = read(fd, buf, size);

		if (ret < 0)
			die("failed to read");
		if (ret == 0)
			die("failed to read: missing data");

		size -= ret;
		buf += ret;
	}
}

struct perf_header *perf_header__read(int fd)
{
	struct perf_header	*self = perf_header__new();
	struct perf_file_header f_header;
	struct perf_file_attr	f_attr;
	u64			f_id;

	int nr_attrs, nr_ids, i, j;

	lseek(fd, 0, SEEK_SET);
	do_read(fd, &f_header, sizeof(f_header));

	if (f_header.magic	!= PERF_MAGIC		||
	    f_header.size	!= sizeof(f_header)	||
	    f_header.attr_size	!= sizeof(f_attr))
		die("incompatible file format");

	nr_attrs = f_header.attrs.size / sizeof(f_attr);
	lseek(fd, f_header.attrs.offset, SEEK_SET);

	for (i = 0; i < nr_attrs; i++) {
		struct perf_header_attr *attr;
		off_t tmp;

		do_read(fd, &f_attr, sizeof(f_attr));
		tmp = lseek(fd, 0, SEEK_CUR);

		attr = perf_header_attr__new(&f_attr.attr);

		nr_ids = f_attr.ids.size / sizeof(u64);
		lseek(fd, f_attr.ids.offset, SEEK_SET);

		for (j = 0; j < nr_ids; j++) {
			do_read(fd, &f_id, sizeof(f_id));

			perf_header_attr__add_id(attr, f_id);
		}
		perf_header__add_attr(self, attr);
		lseek(fd, tmp, SEEK_SET);
	}

	if (f_header.event_types.size) {
		lseek(fd, f_header.event_types.offset, SEEK_SET);
		events = malloc(f_header.event_types.size);
		if (!events)
			die("nomem");
		do_read(fd, events, f_header.event_types.size);
		event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
	}
	self->event_offset = f_header.event_types.offset;
	self->event_size   = f_header.event_types.size;

	self->data_offset = f_header.data.offset;
	self->data_size   = f_header.data.size;

	lseek(fd, self->data_offset, SEEK_SET);

	self->frozen = 1;

	return self;
}

u64 perf_header__sample_type(struct perf_header *header)
{
	u64 type = 0;
	int i;

	for (i = 0; i < header->attrs; i++) {
		struct perf_header_attr *attr = header->attr[i];

		if (!type)
			type = attr->attr.sample_type;
		else if (type != attr->attr.sample_type)
			die("non matching sample_type");
	}

	return type;
}

struct perf_counter_attr *
perf_header__find_attr(u64 id, struct perf_header *header)
{
	int i;

	for (i = 0; i < header->attrs; i++) {
		struct perf_header_attr *attr = header->attr[i];
		int j;

		for (j = 0; j < attr->ids; j++) {
			if (attr->id[j] == id)
				return &attr->attr;
		}
	}

	return NULL;
}
Commit	Line	Data
7c6a1c65 PZ	1	#include <sys/types.h>
	2	#include <unistd.h>
	3	#include <stdio.h>
	4	#include <stdlib.h>
	5
	6	#include "util.h"
	7	#include "header.h"
	8
	9	/*
ec60a3fe	10	* Create new perf.data header attribute:
7c6a1c65	11	*/
7c6a1c65 PZ	12	struct perf_header_attr perf_header_attr__new(struct perf_counter_attr attr)
	13	{
	14	struct perf_header_attr self = malloc(sizeof(self));
	15
	16	if (!self)
	17	die("nomem");
	18
	19	self->attr = *attr;
	20	self->ids = 0;
	21	self->size = 1;
	22	self->id = malloc(sizeof(u64));
	23
	24	if (!self->id)
	25	die("nomem");
	26
	27	return self;
	28	}
	29
	30	void perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
	31	{
	32	int pos = self->ids;
	33
	34	self->ids++;
	35	if (self->ids > self->size) {
	36	self->size *= 2;
	37	self->id = realloc(self->id, self->size * sizeof(u64));
	38	if (!self->id)
	39	die("nomem");
	40	}
	41	self->id[pos] = id;
	42	}
	43
	44	/*
ec60a3fe	45	* Create new perf.data header:
7c6a1c65	46	*/
7c6a1c65 PZ	47	struct perf_header *perf_header__new(void)
	48	{
	49	struct perf_header self = malloc(sizeof(self));
	50
	51	if (!self)
	52	die("nomem");
	53
	54	self->frozen = 0;
	55
	56	self->attrs = 0;
	57	self->size = 1;
	58	self->attr = malloc(sizeof(void *));
	59
	60	if (!self->attr)
	61	die("nomem");
	62
	63	self->data_offset = 0;
	64	self->data_size = 0;
	65
	66	return self;
	67	}
	68
	69	void perf_header__add_attr(struct perf_header *self,
	70	struct perf_header_attr *attr)
	71	{
	72	int pos = self->attrs;
	73
	74	if (self->frozen)
	75	die("frozen");
	76
	77	self->attrs++;
	78	if (self->attrs > self->size) {
	79	self->size *= 2;
	80	self->attr = realloc(self->attr, self->size * sizeof(void *));
	81	if (!self->attr)
	82	die("nomem");
	83	}
	84	self->attr[pos] = attr;
	85	}
	86
ec60a3fe AV	87	#define MAX_EVENT_NAME 64
ec60a3fe AV	88
8755a8f2 AV	89	struct perf_trace_event_type {
8755a8f2 AV	90	u64 event_id;
ec60a3fe	91	char name[MAX_EVENT_NAME];
8755a8f2 AV	92	};
	93
	94	static int event_count;
	95	static struct perf_trace_event_type *events;
	96
	97	void perf_header__push_event(u64 id, const char *name)
	98	{
ec60a3fe	99	if (strlen(name) > MAX_EVENT_NAME)
8755a8f2 AV	100	printf("Event %s will be truncated\n", name);
	101
	102	if (!events) {
	103	events = malloc(sizeof(struct perf_trace_event_type));
	104	if (!events)
	105	die("nomem");
	106	} else {
	107	events = realloc(events, (event_count + 1) * sizeof(struct perf_trace_event_type));
	108	if (!events)
	109	die("nomem");
	110	}
	111	memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
	112	events[event_count].event_id = id;
ec60a3fe	113	strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
8755a8f2 AV	114	event_count++;
	115	}
	116
	117	char *perf_header__find_event(u64 id)
	118	{
	119	int i;
	120	for (i = 0 ; i < event_count; i++) {
	121	if (events[i].event_id == id)
	122	return events[i].name;
	123	}
	124	return NULL;
	125	}
	126
7c6a1c65 PZ	127	static const char *__perf_magic = "PERFFILE";
	128
	129	#define PERF_MAGIC ((u64 )__perf_magic)
	130
	131	struct perf_file_section {
	132	u64 offset;
	133	u64 size;
	134	};
	135
	136	struct perf_file_attr {
	137	struct perf_counter_attr attr;
	138	struct perf_file_section ids;
	139	};
	140
	141	struct perf_file_header {
	142	u64 magic;
	143	u64 size;
	144	u64 attr_size;
	145	struct perf_file_section attrs;
	146	struct perf_file_section data;
8755a8f2	147	struct perf_file_section event_types;
7c6a1c65 PZ	148	};
	149
	150	static void do_write(int fd, void *buf, size_t size)
	151	{
	152	while (size) {
	153	int ret = write(fd, buf, size);
	154
	155	if (ret < 0)
	156	die("failed to write");
	157
	158	size -= ret;
	159	buf += ret;
	160	}
	161	}
	162
	163	void perf_header__write(struct perf_header *self, int fd)
	164	{
	165	struct perf_file_header f_header;
	166	struct perf_file_attr f_attr;
	167	struct perf_header_attr *attr;
	168	int i;
	169
	170	lseek(fd, sizeof(f_header), SEEK_SET);
	171
	172
	173	for (i = 0; i < self->attrs; i++) {
	174	attr = self->attr[i];
	175
	176	attr->id_offset = lseek(fd, 0, SEEK_CUR);
	177	do_write(fd, attr->id, attr->ids * sizeof(u64));
	178	}
	179
	180
	181	self->attr_offset = lseek(fd, 0, SEEK_CUR);
	182
	183	for (i = 0; i < self->attrs; i++) {
	184	attr = self->attr[i];
	185
	186	f_attr = (struct perf_file_attr){
	187	.attr = attr->attr,
	188	.ids = {
	189	.offset = attr->id_offset,
	190	.size = attr->ids * sizeof(u64),
	191	}
	192	};
	193	do_write(fd, &f_attr, sizeof(f_attr));
	194	}
	195
8755a8f2 AV	196	self->event_offset = lseek(fd, 0, SEEK_CUR);
	197	self->event_size = event_count * sizeof(struct perf_trace_event_type);
	198	if (events)
	199	do_write(fd, events, self->event_size);
	200
7c6a1c65 PZ	201
	202	self->data_offset = lseek(fd, 0, SEEK_CUR);
	203
	204	f_header = (struct perf_file_header){
	205	.magic = PERF_MAGIC,
	206	.size = sizeof(f_header),
	207	.attr_size = sizeof(f_attr),
	208	.attrs = {
	209	.offset = self->attr_offset,
	210	.size = self->attrs * sizeof(f_attr),
	211	},
	212	.data = {
	213	.offset = self->data_offset,
	214	.size = self->data_size,
	215	},
8755a8f2 AV	216	.event_types = {
	217	.offset = self->event_offset,
	218	.size = self->event_size,
	219	},
7c6a1c65 PZ	220	};
	221
	222	lseek(fd, 0, SEEK_SET);
	223	do_write(fd, &f_header, sizeof(f_header));
	224	lseek(fd, self->data_offset + self->data_size, SEEK_SET);
	225
	226	self->frozen = 1;
	227	}
	228
	229	static void do_read(int fd, void *buf, size_t size)
	230	{
	231	while (size) {
	232	int ret = read(fd, buf, size);
	233
	234	if (ret < 0)
	235	die("failed to read");
7eac7e9e PH	236	if (ret == 0)
7eac7e9e PH	237	die("failed to read: missing data");
7c6a1c65 PZ	238
	239	size -= ret;
	240	buf += ret;
	241	}
	242	}
	243
	244	struct perf_header *perf_header__read(int fd)
	245	{
	246	struct perf_header *self = perf_header__new();
	247	struct perf_file_header f_header;
	248	struct perf_file_attr f_attr;
	249	u64 f_id;
	250
	251	int nr_attrs, nr_ids, i, j;
	252
	253	lseek(fd, 0, SEEK_SET);
	254	do_read(fd, &f_header, sizeof(f_header));
	255
	256	if (f_header.magic != PERF_MAGIC \|\|
	257	f_header.size != sizeof(f_header) \|\|
	258	f_header.attr_size != sizeof(f_attr))
	259	die("incompatible file format");
	260
	261	nr_attrs = f_header.attrs.size / sizeof(f_attr);
	262	lseek(fd, f_header.attrs.offset, SEEK_SET);
	263
	264	for (i = 0; i < nr_attrs; i++) {
	265	struct perf_header_attr *attr;
1c222bce	266	off_t tmp;
7c6a1c65 PZ	267
7c6a1c65 PZ	268	do_read(fd, &f_attr, sizeof(f_attr));
1c222bce	269	tmp = lseek(fd, 0, SEEK_CUR);
7c6a1c65 PZ	270
	271	attr = perf_header_attr__new(&f_attr.attr);
	272
	273	nr_ids = f_attr.ids.size / sizeof(u64);
	274	lseek(fd, f_attr.ids.offset, SEEK_SET);
	275
	276	for (j = 0; j < nr_ids; j++) {
	277	do_read(fd, &f_id, sizeof(f_id));
	278
	279	perf_header_attr__add_id(attr, f_id);
	280	}
	281	perf_header__add_attr(self, attr);
	282	lseek(fd, tmp, SEEK_SET);
	283	}
	284
8755a8f2 AV	285	if (f_header.event_types.size) {
	286	lseek(fd, f_header.event_types.offset, SEEK_SET);
	287	events = malloc(f_header.event_types.size);
	288	if (!events)
	289	die("nomem");
	290	do_read(fd, events, f_header.event_types.size);
	291	event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
	292	}
	293	self->event_offset = f_header.event_types.offset;
	294	self->event_size = f_header.event_types.size;
	295
7c6a1c65 PZ	296	self->data_offset = f_header.data.offset;
	297	self->data_size = f_header.data.size;
	298
2e01d179	299	lseek(fd, self->data_offset, SEEK_SET);
7c6a1c65 PZ	300
	301	self->frozen = 1;
	302
	303	return self;
	304	}
0d3a5c88 FW	305
	306	u64 perf_header__sample_type(struct perf_header *header)
	307	{
	308	u64 type = 0;
	309	int i;
	310
	311	for (i = 0; i < header->attrs; i++) {
	312	struct perf_header_attr *attr = header->attr[i];
	313
	314	if (!type)
	315	type = attr->attr.sample_type;
	316	else if (type != attr->attr.sample_type)
	317	die("non matching sample_type");
	318	}
	319
	320	return type;
	321	}
	322
	323	struct perf_counter_attr *
	324	perf_header__find_attr(u64 id, struct perf_header *header)
	325	{
	326	int i;
	327
	328	for (i = 0; i < header->attrs; i++) {
	329	struct perf_header_attr *attr = header->attr[i];
	330	int j;
	331
	332	for (j = 0; j < attr->ids; j++) {
	333	if (attr->id[j] == id)
	334	return &attr->attr;
	335	}
	336	}
	337
	338	return NULL;
	339	}