[mirror_ubuntu-bionic-kernel.git] / tools / perf / util / data_map.c

#include "data_map.h"
#include "symbol.h"
#include "util.h"
#include "debug.h"


static struct perf_file_handler *curr_handler;
static unsigned long	mmap_window = 32;
static char		__cwd[PATH_MAX];

static int process_event_stub(event_t *event __used)
{
	dump_printf(": unhandled!\n");
	return 0;
}

void register_perf_file_handler(struct perf_file_handler *handler)
{
	if (!handler->process_sample_event)
		handler->process_sample_event = process_event_stub;
	if (!handler->process_mmap_event)
		handler->process_mmap_event = process_event_stub;
	if (!handler->process_comm_event)
		handler->process_comm_event = process_event_stub;
	if (!handler->process_fork_event)
		handler->process_fork_event = process_event_stub;
	if (!handler->process_exit_event)
		handler->process_exit_event = process_event_stub;
	if (!handler->process_lost_event)
		handler->process_lost_event = process_event_stub;
	if (!handler->process_read_event)
		handler->process_read_event = process_event_stub;
	if (!handler->process_throttle_event)
		handler->process_throttle_event = process_event_stub;
	if (!handler->process_unthrottle_event)
		handler->process_unthrottle_event = process_event_stub;

	curr_handler = handler;
}

static const char *event__name[] = {
	[0]			 = "TOTAL",
	[PERF_RECORD_MMAP]	 = "MMAP",
	[PERF_RECORD_LOST]	 = "LOST",
	[PERF_RECORD_COMM]	 = "COMM",
	[PERF_RECORD_EXIT]	 = "EXIT",
	[PERF_RECORD_THROTTLE]	 = "THROTTLE",
	[PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
	[PERF_RECORD_FORK]	 = "FORK",
	[PERF_RECORD_READ]	 = "READ",
	[PERF_RECORD_SAMPLE]	 = "SAMPLE",
};

unsigned long event__total[PERF_RECORD_MAX];

void event__print_totals(void)
{
	int i;
	for (i = 0; i < PERF_RECORD_MAX; ++i)
		pr_info("%10s events: %10ld\n",
			event__name[i], event__total[i]);
}

static int
process_event(event_t *event, unsigned long offset, unsigned long head)
{
	trace_event(event);

	if (event->header.type < PERF_RECORD_MAX) {
		dump_printf("%p [%p]: PERF_RECORD_%s",
			    (void *)(offset + head),
			    (void *)(long)(event->header.size),
			    event__name[event->header.type]);
		++event__total[0];
		++event__total[event->header.type];
	}

	switch (event->header.type) {
	case PERF_RECORD_SAMPLE:
		return curr_handler->process_sample_event(event);
	case PERF_RECORD_MMAP:
		return curr_handler->process_mmap_event(event);
	case PERF_RECORD_COMM:
		return curr_handler->process_comm_event(event);
	case PERF_RECORD_FORK:
		return curr_handler->process_fork_event(event);
	case PERF_RECORD_EXIT:
		return curr_handler->process_exit_event(event);
	case PERF_RECORD_LOST:
		return curr_handler->process_lost_event(event);
	case PERF_RECORD_READ:
		return curr_handler->process_read_event(event);
	case PERF_RECORD_THROTTLE:
		return curr_handler->process_throttle_event(event);
	case PERF_RECORD_UNTHROTTLE:
		return curr_handler->process_unthrottle_event(event);
	default:
		curr_handler->total_unknown++;
		return -1;
	}
}

int perf_header__read_build_ids(int input, u64 offset, u64 size)
{
	struct build_id_event bev;
	char filename[PATH_MAX];
	u64 limit = offset + size;
	int err = -1;

	while (offset < limit) {
		struct dso *dso;
		ssize_t len;

		if (read(input, &bev, sizeof(bev)) != sizeof(bev))
			goto out;

		len = bev.header.size - sizeof(bev);
		if (read(input, filename, len) != len)
			goto out;

		dso = dsos__findnew(filename);
		if (dso != NULL)
			dso__set_build_id(dso, &bev.build_id);

		offset += bev.header.size;
	}
	err = 0;
out:
	return err;
}

int perf_session__process_events(struct perf_session *self,
				 int full_paths, int *cwdlen, char **cwd)
{
	int err;
	unsigned long head, shift;
	unsigned long offset = 0;
	size_t	page_size;
	u64 sample_type;
	event_t *event;
	uint32_t size;
	char *buf;

	if (curr_handler == NULL) {
		pr_debug("Forgot to register perf file handler\n");
		return -EINVAL;
	}

	page_size = getpagesize();

	head = self->header.data_offset;
	sample_type = perf_header__sample_type(&self->header);

	err = -EINVAL;
	if (curr_handler->sample_type_check &&
	    curr_handler->sample_type_check(sample_type) < 0)
		goto out_err;

	if (!full_paths) {
		if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
			pr_err("failed to get the current directory\n");
			err = -errno;
			goto out_err;
		}
		*cwd = __cwd;
		*cwdlen = strlen(*cwd);
	} else {
		*cwd = NULL;
		*cwdlen = 0;
	}

	shift = page_size * (head / page_size);
	offset += shift;
	head -= shift;

remap:
	buf = mmap(NULL, page_size * mmap_window, PROT_READ,
		   MAP_SHARED, self->fd, offset);
	if (buf == MAP_FAILED) {
		pr_err("failed to mmap file\n");
		err = -errno;
		goto out_err;
	}

more:
	event = (event_t *)(buf + head);

	size = event->header.size;
	if (!size)
		size = 8;

	if (head + event->header.size >= page_size * mmap_window) {
		int munmap_ret;

		shift = page_size * (head / page_size);

		munmap_ret = munmap(buf, page_size * mmap_window);
		assert(munmap_ret == 0);

		offset += shift;
		head -= shift;
		goto remap;
	}

	size = event->header.size;

	dump_printf("\n%p [%p]: event: %d\n",
			(void *)(offset + head),
			(void *)(long)event->header.size,
			event->header.type);

	if (!size || process_event(event, offset, head) < 0) {

		dump_printf("%p [%p]: skipping unknown header type: %d\n",
			(void *)(offset + head),
			(void *)(long)(event->header.size),
			event->header.type);

		/*
		 * assume we lost track of the stream, check alignment, and
		 * increment a single u64 in the hope to catch on again 'soon'.
		 */

		if (unlikely(head & 7))
			head &= ~7ULL;

		size = 8;
	}

	head += size;

	if (offset + head >= self->header.data_offset + self->header.data_size)
		goto done;

	if (offset + head < self->size)
		goto more;

done:
	err = 0;
out_err:
	return err;
}
Commit	Line	Data
016e92fb FW	1	#include "data_map.h"
	2	#include "symbol.h"
	3	#include "util.h"
	4	#include "debug.h"
	5
	6
	7	static struct perf_file_handler *curr_handler;
	8	static unsigned long mmap_window = 32;
	9	static char __cwd[PATH_MAX];
	10
62daacb5	11	static int process_event_stub(event_t *event __used)
016e92fb	12	{
62daacb5	13	dump_printf(": unhandled!\n");
016e92fb FW	14	return 0;
	15	}
	16
	17	void register_perf_file_handler(struct perf_file_handler *handler)
	18	{
	19	if (!handler->process_sample_event)
	20	handler->process_sample_event = process_event_stub;
	21	if (!handler->process_mmap_event)
	22	handler->process_mmap_event = process_event_stub;
	23	if (!handler->process_comm_event)
	24	handler->process_comm_event = process_event_stub;
	25	if (!handler->process_fork_event)
	26	handler->process_fork_event = process_event_stub;
	27	if (!handler->process_exit_event)
	28	handler->process_exit_event = process_event_stub;
	29	if (!handler->process_lost_event)
	30	handler->process_lost_event = process_event_stub;
	31	if (!handler->process_read_event)
	32	handler->process_read_event = process_event_stub;
	33	if (!handler->process_throttle_event)
	34	handler->process_throttle_event = process_event_stub;
	35	if (!handler->process_unthrottle_event)
	36	handler->process_unthrottle_event = process_event_stub;
	37
	38	curr_handler = handler;
	39	}
	40
62daacb5 ACM	41	static const char *event__name[] = {
	42	[0] = "TOTAL",
	43	[PERF_RECORD_MMAP] = "MMAP",
	44	[PERF_RECORD_LOST] = "LOST",
	45	[PERF_RECORD_COMM] = "COMM",
	46	[PERF_RECORD_EXIT] = "EXIT",
	47	[PERF_RECORD_THROTTLE] = "THROTTLE",
	48	[PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
	49	[PERF_RECORD_FORK] = "FORK",
	50	[PERF_RECORD_READ] = "READ",
	51	[PERF_RECORD_SAMPLE] = "SAMPLE",
	52	};
	53
	54	unsigned long event__total[PERF_RECORD_MAX];
	55
	56	void event__print_totals(void)
	57	{
	58	int i;
	59	for (i = 0; i < PERF_RECORD_MAX; ++i)
	60	pr_info("%10s events: %10ld\n",
	61	event__name[i], event__total[i]);
	62	}
	63
016e92fb FW	64	static int
	65	process_event(event_t *event, unsigned long offset, unsigned long head)
	66	{
	67	trace_event(event);
	68
62daacb5 ACM	69	if (event->header.type < PERF_RECORD_MAX) {
	70	dump_printf("%p [%p]: PERF_RECORD_%s",
	71	(void *)(offset + head),
	72	(void *)(long)(event->header.size),
	73	event__name[event->header.type]);
	74	++event__total[0];
	75	++event__total[event->header.type];
	76	}
	77
016e92fb FW	78	switch (event->header.type) {
016e92fb FW	79	case PERF_RECORD_SAMPLE:
62daacb5	80	return curr_handler->process_sample_event(event);
016e92fb	81	case PERF_RECORD_MMAP:
62daacb5	82	return curr_handler->process_mmap_event(event);
016e92fb	83	case PERF_RECORD_COMM:
62daacb5	84	return curr_handler->process_comm_event(event);
016e92fb	85	case PERF_RECORD_FORK:
62daacb5	86	return curr_handler->process_fork_event(event);
016e92fb	87	case PERF_RECORD_EXIT:
62daacb5	88	return curr_handler->process_exit_event(event);
016e92fb	89	case PERF_RECORD_LOST:
62daacb5	90	return curr_handler->process_lost_event(event);
016e92fb	91	case PERF_RECORD_READ:
62daacb5	92	return curr_handler->process_read_event(event);
016e92fb	93	case PERF_RECORD_THROTTLE:
62daacb5	94	return curr_handler->process_throttle_event(event);
016e92fb	95	case PERF_RECORD_UNTHROTTLE:
62daacb5	96	return curr_handler->process_unthrottle_event(event);
016e92fb FW	97	default:
	98	curr_handler->total_unknown++;
	99	return -1;
	100	}
	101	}
	102
716d69e4	103	int perf_header__read_build_ids(int input, u64 offset, u64 size)
8d06367f	104	{
8d06367f ACM	105	struct build_id_event bev;
8d06367f ACM	106	char filename[PATH_MAX];
716d69e4	107	u64 limit = offset + size;
8d06367f ACM	108	int err = -1;
8d06367f ACM	109
9e827dd0	110	while (offset < limit) {
8d06367f ACM	111	struct dso *dso;
	112	ssize_t len;
	113
	114	if (read(input, &bev, sizeof(bev)) != sizeof(bev))
	115	goto out;
	116
	117	len = bev.header.size - sizeof(bev);
	118	if (read(input, filename, len) != len)
	119	goto out;
	120
	121	dso = dsos__findnew(filename);
	122	if (dso != NULL)
	123	dso__set_build_id(dso, &bev.build_id);
	124
	125	offset += bev.header.size;
	126	}
	127	err = 0;
	128	out:
	129	return err;
	130	}
	131
94c744b6 ACM	132	int perf_session__process_events(struct perf_session *self,
94c744b6 ACM	133	int full_paths, int cwdlen, char *cwd)
016e92fb	134	{
6b0cb5f9	135	int err;
016e92fb FW	136	unsigned long head, shift;
016e92fb FW	137	unsigned long offset = 0;
016e92fb FW	138	size_t page_size;
	139	u64 sample_type;
	140	event_t *event;
	141	uint32_t size;
016e92fb FW	142	char *buf;
016e92fb FW	143
6b0cb5f9 ACM	144	if (curr_handler == NULL) {
	145	pr_debug("Forgot to register perf file handler\n");
	146	return -EINVAL;
	147	}
016e92fb FW	148
	149	page_size = getpagesize();
	150
94c744b6 ACM	151	head = self->header.data_offset;
94c744b6 ACM	152	sample_type = perf_header__sample_type(&self->header);
016e92fb	153
6b0cb5f9 ACM	154	err = -EINVAL;
	155	if (curr_handler->sample_type_check &&
	156	curr_handler->sample_type_check(sample_type) < 0)
94c744b6	157	goto out_err;
016e92fb	158
016e92fb FW	159	if (!full_paths) {
016e92fb FW	160	if (getcwd(__cwd, sizeof(__cwd)) == NULL) {
6b0cb5f9 ACM	161	pr_err("failed to get the current directory\n");
6b0cb5f9 ACM	162	err = -errno;
94c744b6	163	goto out_err;
016e92fb FW	164	}
	165	*cwd = __cwd;
	166	cwdlen = strlen(cwd);
	167	} else {
	168	*cwd = NULL;
	169	*cwdlen = 0;
	170	}
	171
	172	shift = page_size * (head / page_size);
	173	offset += shift;
	174	head -= shift;
	175
	176	remap:
6b0cb5f9	177	buf = mmap(NULL, page_size * mmap_window, PROT_READ,
94c744b6	178	MAP_SHARED, self->fd, offset);
016e92fb	179	if (buf == MAP_FAILED) {
6b0cb5f9 ACM	180	pr_err("failed to mmap file\n");
6b0cb5f9 ACM	181	err = -errno;
94c744b6	182	goto out_err;
016e92fb FW	183	}
	184
	185	more:
	186	event = (event_t *)(buf + head);
	187
	188	size = event->header.size;
	189	if (!size)
	190	size = 8;
	191
	192	if (head + event->header.size >= page_size * mmap_window) {
	193	int munmap_ret;
	194
	195	shift = page_size * (head / page_size);
	196
	197	munmap_ret = munmap(buf, page_size * mmap_window);
	198	assert(munmap_ret == 0);
	199
	200	offset += shift;
	201	head -= shift;
	202	goto remap;
	203	}
	204
	205	size = event->header.size;
	206
	207	dump_printf("\n%p [%p]: event: %d\n",
	208	(void *)(offset + head),
	209	(void *)(long)event->header.size,
	210	event->header.type);
	211
	212	if (!size \|\| process_event(event, offset, head) < 0) {
	213
	214	dump_printf("%p [%p]: skipping unknown header type: %d\n",
	215	(void *)(offset + head),
	216	(void *)(long)(event->header.size),
	217	event->header.type);
	218
	219	/*
	220	* assume we lost track of the stream, check alignment, and
	221	* increment a single u64 in the hope to catch on again 'soon'.
	222	*/
	223
	224	if (unlikely(head & 7))
	225	head &= ~7ULL;
	226
	227	size = 8;
	228	}
	229
	230	head += size;
	231
94c744b6	232	if (offset + head >= self->header.data_offset + self->header.data_size)
016e92fb FW	233	goto done;
016e92fb FW	234
94c744b6	235	if (offset + head < self->size)
016e92fb FW	236	goto more;
	237
	238	done:
6b0cb5f9	239	err = 0;
94c744b6	240	out_err:
6b0cb5f9	241	return err;
016e92fb	242	}