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

#include <linux/kernel.h>

#include <byteswap.h>
#include <unistd.h>
#include <sys/types.h>

#include "session.h"
#include "sort.h"
#include "util.h"

static int perf_session__open(struct perf_session *self, bool force)
{
	struct stat input_stat;

	self->fd = open(self->filename, O_RDONLY);
	if (self->fd < 0) {
		pr_err("failed to open file: %s", self->filename);
		if (!strcmp(self->filename, "perf.data"))
			pr_err("  (try 'perf record' first)");
		pr_err("\n");
		return -errno;
	}

	if (fstat(self->fd, &input_stat) < 0)
		goto out_close;

	if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
		pr_err("file %s not owned by current user or root\n",
		       self->filename);
		goto out_close;
	}

	if (!input_stat.st_size) {
		pr_info("zero-sized file (%s), nothing to do!\n",
			self->filename);
		goto out_close;
	}

	if (perf_header__read(&self->header, self->fd) < 0) {
		pr_err("incompatible file format");
		goto out_close;
	}

	self->size = input_stat.st_size;
	return 0;

out_close:
	close(self->fd);
	self->fd = -1;
	return -1;
}

struct perf_session *perf_session__new(const char *filename, int mode, bool force)
{
	size_t len = filename ? strlen(filename) + 1 : 0;
	struct perf_session *self = zalloc(sizeof(*self) + len);

	if (self == NULL)
		goto out;

	if (perf_header__init(&self->header) < 0)
		goto out_free;

	memcpy(self->filename, filename, len);
	self->threads = RB_ROOT;
	self->last_match = NULL;
	self->mmap_window = 32;
	self->cwd = NULL;
	self->cwdlen = 0;
	self->unknown_events = 0;
	map_groups__init(&self->kmaps);

	if (mode == O_RDONLY) {
		if (perf_session__open(self, force) < 0)
			goto out_delete;
	} else if (mode == O_WRONLY) {
		/*
		 * In O_RDONLY mode this will be performed when reading the
		 * kernel MMAP event, in event__process_mmap().
		 */
		if (perf_session__create_kernel_maps(self) < 0)
			goto out_delete;
	}

	self->sample_type = perf_header__sample_type(&self->header);
out:
	return self;
out_free:
	free(self);
	return NULL;
out_delete:
	perf_session__delete(self);
	return NULL;
}

void perf_session__delete(struct perf_session *self)
{
	perf_header__exit(&self->header);
	close(self->fd);
	free(self->cwd);
	free(self);
}

static bool symbol__match_parent_regex(struct symbol *sym)
{
	if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
		return 1;

	return 0;
}

struct symbol **perf_session__resolve_callchain(struct perf_session *self,
						struct thread *thread,
						struct ip_callchain *chain,
						struct symbol **parent)
{
	u8 cpumode = PERF_RECORD_MISC_USER;
	struct symbol **syms = NULL;
	unsigned int i;

	if (symbol_conf.use_callchain) {
		syms = calloc(chain->nr, sizeof(*syms));
		if (!syms) {
			fprintf(stderr, "Can't allocate memory for symbols\n");
			exit(-1);
		}
	}

	for (i = 0; i < chain->nr; i++) {
		u64 ip = chain->ips[i];
		struct addr_location al;

		if (ip >= PERF_CONTEXT_MAX) {
			switch (ip) {
			case PERF_CONTEXT_HV:
				cpumode = PERF_RECORD_MISC_HYPERVISOR;	break;
			case PERF_CONTEXT_KERNEL:
				cpumode = PERF_RECORD_MISC_KERNEL;	break;
			case PERF_CONTEXT_USER:
				cpumode = PERF_RECORD_MISC_USER;	break;
			default:
				break;
			}
			continue;
		}

		thread__find_addr_location(thread, self, cpumode,
					   MAP__FUNCTION, ip, &al, NULL);
		if (al.sym != NULL) {
			if (sort__has_parent && !*parent &&
			    symbol__match_parent_regex(al.sym))
				*parent = al.sym;
			if (!symbol_conf.use_callchain)
				break;
			syms[i] = al.sym;
		}
	}

	return syms;
}

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

static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
{
	if (handler->sample == NULL)
		handler->sample = process_event_stub;
	if (handler->mmap == NULL)
		handler->mmap = process_event_stub;
	if (handler->comm == NULL)
		handler->comm = process_event_stub;
	if (handler->fork == NULL)
		handler->fork = process_event_stub;
	if (handler->exit == NULL)
		handler->exit = process_event_stub;
	if (handler->lost == NULL)
		handler->lost = process_event_stub;
	if (handler->read == NULL)
		handler->read = process_event_stub;
	if (handler->throttle == NULL)
		handler->throttle = process_event_stub;
	if (handler->unthrottle == NULL)
		handler->unthrottle = process_event_stub;
}

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]);
}

void mem_bswap_64(void *src, int byte_size)
{
	u64 *m = src;

	while (byte_size > 0) {
		*m = bswap_64(*m);
		byte_size -= sizeof(u64);
		++m;
	}
}

static void event__all64_swap(event_t *self)
{
	struct perf_event_header *hdr = &self->header;
	mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
}

static void event__comm_swap(event_t *self)
{
	self->comm.pid = bswap_32(self->comm.pid);
	self->comm.tid = bswap_32(self->comm.tid);
}

static void event__mmap_swap(event_t *self)
{
	self->mmap.pid	 = bswap_32(self->mmap.pid);
	self->mmap.tid	 = bswap_32(self->mmap.tid);
	self->mmap.start = bswap_64(self->mmap.start);
	self->mmap.len	 = bswap_64(self->mmap.len);
	self->mmap.pgoff = bswap_64(self->mmap.pgoff);
}

static void event__task_swap(event_t *self)
{
	self->fork.pid	= bswap_32(self->fork.pid);
	self->fork.tid	= bswap_32(self->fork.tid);
	self->fork.ppid	= bswap_32(self->fork.ppid);
	self->fork.ptid	= bswap_32(self->fork.ptid);
	self->fork.time	= bswap_64(self->fork.time);
}

static void event__read_swap(event_t *self)
{
	self->read.pid		= bswap_32(self->read.pid);
	self->read.tid		= bswap_32(self->read.tid);
	self->read.value	= bswap_64(self->read.value);
	self->read.time_enabled	= bswap_64(self->read.time_enabled);
	self->read.time_running	= bswap_64(self->read.time_running);
	self->read.id		= bswap_64(self->read.id);
}

typedef void (*event__swap_op)(event_t *self);

static event__swap_op event__swap_ops[] = {
	[PERF_RECORD_MMAP]   = event__mmap_swap,
	[PERF_RECORD_COMM]   = event__comm_swap,
	[PERF_RECORD_FORK]   = event__task_swap,
	[PERF_RECORD_EXIT]   = event__task_swap,
	[PERF_RECORD_LOST]   = event__all64_swap,
	[PERF_RECORD_READ]   = event__read_swap,
	[PERF_RECORD_SAMPLE] = event__all64_swap,
	[PERF_RECORD_MAX]    = NULL,
};

static int perf_session__process_event(struct perf_session *self,
				       event_t *event,
				       struct perf_event_ops *ops,
				       u64 offset, u64 head)
{
	trace_event(event);

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

	if (self->header.needs_swap && event__swap_ops[event->header.type])
		event__swap_ops[event->header.type](event);

	switch (event->header.type) {
	case PERF_RECORD_SAMPLE:
		return ops->sample(event, self);
	case PERF_RECORD_MMAP:
		return ops->mmap(event, self);
	case PERF_RECORD_COMM:
		return ops->comm(event, self);
	case PERF_RECORD_FORK:
		return ops->fork(event, self);
	case PERF_RECORD_EXIT:
		return ops->exit(event, self);
	case PERF_RECORD_LOST:
		return ops->lost(event, self);
	case PERF_RECORD_READ:
		return ops->read(event, self);
	case PERF_RECORD_THROTTLE:
		return ops->throttle(event, self);
	case PERF_RECORD_UNTHROTTLE:
		return ops->unthrottle(event, self);
	default:
		self->unknown_events++;
		return -1;
	}
}

void perf_event_header__bswap(struct perf_event_header *self)
{
	self->type = bswap_32(self->type);
	self->misc = bswap_16(self->misc);
	self->size = bswap_16(self->size);
}

int perf_header__read_build_ids(struct perf_header *self,
				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;
		struct list_head *head = &dsos__user;

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

		if (self->needs_swap)
			perf_event_header__bswap(&bev.header);

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

		if (bev.header.misc & PERF_RECORD_MISC_KERNEL)
			head = &dsos__kernel;

		dso = __dsos__findnew(head, filename);
		if (dso != NULL) {
			dso__set_build_id(dso, &bev.build_id);
			if (head == &dsos__kernel && filename[0] == '[')
				dso->kernel = 1;
		}

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

static struct thread *perf_session__register_idle_thread(struct perf_session *self)
{
	struct thread *thread = perf_session__findnew(self, 0);

	if (thread == NULL || thread__set_comm(thread, "swapper")) {
		pr_err("problem inserting idle task.\n");
		thread = NULL;
	}

	return thread;
}

int perf_session__process_events(struct perf_session *self,
				 struct perf_event_ops *ops)
{
	int err, mmap_prot, mmap_flags;
	u64 head, shift;
	u64 offset = 0;
	size_t	page_size;
	event_t *event;
	uint32_t size;
	char *buf;

	if (perf_session__register_idle_thread(self) == NULL)
		return -ENOMEM;

	perf_event_ops__fill_defaults(ops);

	page_size = sysconf(_SC_PAGESIZE);

	head = self->header.data_offset;

	if (!symbol_conf.full_paths) {
		char bf[PATH_MAX];

		if (getcwd(bf, sizeof(bf)) == NULL) {
			err = -errno;
out_getcwd_err:
			pr_err("failed to get the current directory\n");
			goto out_err;
		}
		self->cwd = strdup(bf);
		if (self->cwd == NULL) {
			err = -ENOMEM;
			goto out_getcwd_err;
		}
		self->cwdlen = strlen(self->cwd);
	}

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

	mmap_prot  = PROT_READ;
	mmap_flags = MAP_SHARED;

	if (self->header.needs_swap) {
		mmap_prot  |= PROT_WRITE;
		mmap_flags = MAP_PRIVATE;
	}
remap:
	buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
		   mmap_flags, 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);

	if (self->header.needs_swap)
		perf_event_header__bswap(&event->header);
	size = event->header.size;
	if (size == 0)
		size = 8;

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

		shift = page_size * (head / page_size);

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

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

	size = event->header.size;

	dump_printf("\n%#Lx [%#x]: event: %d\n",
		    offset + head, event->header.size, event->header.type);

	if (size == 0 ||
	    perf_session__process_event(self, event, ops, offset, head) < 0) {
		dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
			    offset + head, 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;
}

bool perf_session__has_traces(struct perf_session *self, const char *msg)
{
	if (!(self->sample_type & PERF_SAMPLE_RAW)) {
		pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
		return false;
	}

	return true;
}

int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
					     const char *symbol_name,
					     u64 addr)
{
	char *bracket;

	self->ref_reloc_sym.name = strdup(symbol_name);
	if (self->ref_reloc_sym.name == NULL)
		return -ENOMEM;

	bracket = strchr(self->ref_reloc_sym.name, ']');
	if (bracket)
		*bracket = '\0';

	self->ref_reloc_sym.addr = addr;
	return 0;
}

static u64 map__reloc_map_ip(struct map *map, u64 ip)
{
	return ip + (s64)map->pgoff;
}

static u64 map__reloc_unmap_ip(struct map *map, u64 ip)
{
	return ip - (s64)map->pgoff;
}

void perf_session__reloc_vmlinux_maps(struct perf_session *self,
				      u64 unrelocated_addr)
{
	enum map_type type;
	s64 reloc = unrelocated_addr - self->ref_reloc_sym.addr;

	if (!reloc)
		return;

	for (type = 0; type < MAP__NR_TYPES; ++type) {
		struct map *map = self->vmlinux_maps[type];

		map->map_ip = map__reloc_map_ip;
		map->unmap_ip = map__reloc_unmap_ip;
		map->pgoff = reloc;
	}
}
Commit	Line	Data
94c744b6 ACM	1	#include <linux/kernel.h>
94c744b6 ACM	2
ba21594c	3	#include <byteswap.h>
94c744b6 ACM	4	#include <unistd.h>
	5	#include <sys/types.h>
	6
	7	#include "session.h"
a328626b	8	#include "sort.h"
94c744b6 ACM	9	#include "util.h"
	10
	11	static int perf_session__open(struct perf_session *self, bool force)
	12	{
	13	struct stat input_stat;
	14
	15	self->fd = open(self->filename, O_RDONLY);
	16	if (self->fd < 0) {
	17	pr_err("failed to open file: %s", self->filename);
	18	if (!strcmp(self->filename, "perf.data"))
	19	pr_err(" (try 'perf record' first)");
	20	pr_err("\n");
	21	return -errno;
	22	}
	23
	24	if (fstat(self->fd, &input_stat) < 0)
	25	goto out_close;
	26
	27	if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
	28	pr_err("file %s not owned by current user or root\n",
	29	self->filename);
	30	goto out_close;
	31	}
	32
	33	if (!input_stat.st_size) {
	34	pr_info("zero-sized file (%s), nothing to do!\n",
	35	self->filename);
	36	goto out_close;
	37	}
	38
	39	if (perf_header__read(&self->header, self->fd) < 0) {
	40	pr_err("incompatible file format");
	41	goto out_close;
	42	}
	43
	44	self->size = input_stat.st_size;
	45	return 0;
	46
	47	out_close:
	48	close(self->fd);
	49	self->fd = -1;
	50	return -1;
	51	}
	52
75be6cf4	53	struct perf_session perf_session__new(const char filename, int mode, bool force)
94c744b6	54	{
b3165f41	55	size_t len = filename ? strlen(filename) + 1 : 0;
94c744b6 ACM	56	struct perf_session self = zalloc(sizeof(self) + len);
	57
	58	if (self == NULL)
	59	goto out;
	60
	61	if (perf_header__init(&self->header) < 0)
4aa65636	62	goto out_free;
94c744b6 ACM	63
94c744b6 ACM	64	memcpy(self->filename, filename, len);
b3165f41 ACM	65	self->threads = RB_ROOT;
b3165f41 ACM	66	self->last_match = NULL;
ec913369 ACM	67	self->mmap_window = 32;
	68	self->cwd = NULL;
	69	self->cwdlen = 0;
31d337c4	70	self->unknown_events = 0;
4aa65636	71	map_groups__init(&self->kmaps);
94c744b6	72
64abebf7 ACM	73	if (mode == O_RDONLY) {
	74	if (perf_session__open(self, force) < 0)
	75	goto out_delete;
	76	} else if (mode == O_WRONLY) {
	77	/*
	78	* In O_RDONLY mode this will be performed when reading the
	79	* kernel MMAP event, in event__process_mmap().
	80	*/
	81	if (perf_session__create_kernel_maps(self) < 0)
	82	goto out_delete;
	83	}
d549c769 ACM	84
d549c769 ACM	85	self->sample_type = perf_header__sample_type(&self->header);
94c744b6 ACM	86	out:
94c744b6 ACM	87	return self;
4aa65636	88	out_free:
94c744b6 ACM	89	free(self);
94c744b6 ACM	90	return NULL;
4aa65636 ACM	91	out_delete:
	92	perf_session__delete(self);
	93	return NULL;
94c744b6 ACM	94	}
	95
	96	void perf_session__delete(struct perf_session *self)
	97	{
	98	perf_header__exit(&self->header);
	99	close(self->fd);
ec913369	100	free(self->cwd);
94c744b6 ACM	101	free(self);
94c744b6 ACM	102	}
a328626b ACM	103
	104	static bool symbol__match_parent_regex(struct symbol *sym)
	105	{
	106	if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
	107	return 1;
	108
	109	return 0;
	110	}
	111
	112	struct symbol *perf_session__resolve_callchain(struct perf_session self,
	113	struct thread *thread,
	114	struct ip_callchain *chain,
	115	struct symbol **parent)
	116	{
	117	u8 cpumode = PERF_RECORD_MISC_USER;
	118	struct symbol **syms = NULL;
	119	unsigned int i;
	120
d599db3f	121	if (symbol_conf.use_callchain) {
a328626b ACM	122	syms = calloc(chain->nr, sizeof(*syms));
	123	if (!syms) {
	124	fprintf(stderr, "Can't allocate memory for symbols\n");
	125	exit(-1);
	126	}
	127	}
	128
	129	for (i = 0; i < chain->nr; i++) {
	130	u64 ip = chain->ips[i];
	131	struct addr_location al;
	132
	133	if (ip >= PERF_CONTEXT_MAX) {
	134	switch (ip) {
	135	case PERF_CONTEXT_HV:
	136	cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
	137	case PERF_CONTEXT_KERNEL:
	138	cpumode = PERF_RECORD_MISC_KERNEL; break;
	139	case PERF_CONTEXT_USER:
	140	cpumode = PERF_RECORD_MISC_USER; break;
	141	default:
	142	break;
	143	}
	144	continue;
	145	}
	146
	147	thread__find_addr_location(thread, self, cpumode,
	148	MAP__FUNCTION, ip, &al, NULL);
	149	if (al.sym != NULL) {
	150	if (sort__has_parent && !*parent &&
	151	symbol__match_parent_regex(al.sym))
	152	*parent = al.sym;
d599db3f	153	if (!symbol_conf.use_callchain)
a328626b ACM	154	break;
	155	syms[i] = al.sym;
	156	}
	157	}
	158
	159	return syms;
	160	}
06aae590 ACM	161
	162	static int process_event_stub(event_t *event __used,
	163	struct perf_session *session __used)
	164	{
	165	dump_printf(": unhandled!\n");
	166	return 0;
	167	}
	168
	169	static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
	170	{
55aa640f ACM	171	if (handler->sample == NULL)
	172	handler->sample = process_event_stub;
	173	if (handler->mmap == NULL)
	174	handler->mmap = process_event_stub;
	175	if (handler->comm == NULL)
	176	handler->comm = process_event_stub;
	177	if (handler->fork == NULL)
	178	handler->fork = process_event_stub;
	179	if (handler->exit == NULL)
	180	handler->exit = process_event_stub;
	181	if (handler->lost == NULL)
	182	handler->lost = process_event_stub;
	183	if (handler->read == NULL)
	184	handler->read = process_event_stub;
	185	if (handler->throttle == NULL)
	186	handler->throttle = process_event_stub;
	187	if (handler->unthrottle == NULL)
	188	handler->unthrottle = process_event_stub;
06aae590 ACM	189	}
	190
	191	static const char *event__name[] = {
	192	[0] = "TOTAL",
	193	[PERF_RECORD_MMAP] = "MMAP",
	194	[PERF_RECORD_LOST] = "LOST",
	195	[PERF_RECORD_COMM] = "COMM",
	196	[PERF_RECORD_EXIT] = "EXIT",
	197	[PERF_RECORD_THROTTLE] = "THROTTLE",
	198	[PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
	199	[PERF_RECORD_FORK] = "FORK",
	200	[PERF_RECORD_READ] = "READ",
	201	[PERF_RECORD_SAMPLE] = "SAMPLE",
	202	};
	203
	204	unsigned long event__total[PERF_RECORD_MAX];
	205
	206	void event__print_totals(void)
	207	{
	208	int i;
	209	for (i = 0; i < PERF_RECORD_MAX; ++i)
	210	pr_info("%10s events: %10ld\n",
	211	event__name[i], event__total[i]);
	212	}
	213
ba21594c ACM	214	void mem_bswap_64(void *src, int byte_size)
	215	{
	216	u64 *m = src;
	217
	218	while (byte_size > 0) {
	219	m = bswap_64(m);
	220	byte_size -= sizeof(u64);
	221	++m;
	222	}
	223	}
	224
	225	static void event__all64_swap(event_t *self)
	226	{
	227	struct perf_event_header *hdr = &self->header;
	228	mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
	229	}
	230
	231	static void event__comm_swap(event_t *self)
	232	{
	233	self->comm.pid = bswap_32(self->comm.pid);
	234	self->comm.tid = bswap_32(self->comm.tid);
	235	}
	236
	237	static void event__mmap_swap(event_t *self)
	238	{
	239	self->mmap.pid = bswap_32(self->mmap.pid);
	240	self->mmap.tid = bswap_32(self->mmap.tid);
	241	self->mmap.start = bswap_64(self->mmap.start);
	242	self->mmap.len = bswap_64(self->mmap.len);
	243	self->mmap.pgoff = bswap_64(self->mmap.pgoff);
	244	}
	245
	246	static void event__task_swap(event_t *self)
	247	{
	248	self->fork.pid = bswap_32(self->fork.pid);
	249	self->fork.tid = bswap_32(self->fork.tid);
	250	self->fork.ppid = bswap_32(self->fork.ppid);
	251	self->fork.ptid = bswap_32(self->fork.ptid);
	252	self->fork.time = bswap_64(self->fork.time);
	253	}
	254
	255	static void event__read_swap(event_t *self)
	256	{
	257	self->read.pid = bswap_32(self->read.pid);
	258	self->read.tid = bswap_32(self->read.tid);
	259	self->read.value = bswap_64(self->read.value);
	260	self->read.time_enabled = bswap_64(self->read.time_enabled);
	261	self->read.time_running = bswap_64(self->read.time_running);
	262	self->read.id = bswap_64(self->read.id);
	263	}
	264
	265	typedef void (event__swap_op)(event_t self);
	266
	267	static event__swap_op event__swap_ops[] = {
	268	[PERF_RECORD_MMAP] = event__mmap_swap,
	269	[PERF_RECORD_COMM] = event__comm_swap,
	270	[PERF_RECORD_FORK] = event__task_swap,
	271	[PERF_RECORD_EXIT] = event__task_swap,
	272	[PERF_RECORD_LOST] = event__all64_swap,
	273	[PERF_RECORD_READ] = event__read_swap,
	274	[PERF_RECORD_SAMPLE] = event__all64_swap,
	275	[PERF_RECORD_MAX] = NULL,
	276	};
	277
06aae590 ACM	278	static int perf_session__process_event(struct perf_session *self,
	279	event_t *event,
	280	struct perf_event_ops *ops,
ba21594c	281	u64 offset, u64 head)
06aae590 ACM	282	{
	283	trace_event(event);
	284
	285	if (event->header.type < PERF_RECORD_MAX) {
ba21594c	286	dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
0d755034	287	offset + head, event->header.size,
06aae590 ACM	288	event__name[event->header.type]);
	289	++event__total[0];
	290	++event__total[event->header.type];
	291	}
	292
ba21594c ACM	293	if (self->header.needs_swap && event__swap_ops[event->header.type])
	294	event__swap_ops[event->header.type](event);
	295
06aae590 ACM	296	switch (event->header.type) {
06aae590 ACM	297	case PERF_RECORD_SAMPLE:
55aa640f	298	return ops->sample(event, self);
06aae590	299	case PERF_RECORD_MMAP:
55aa640f	300	return ops->mmap(event, self);
06aae590	301	case PERF_RECORD_COMM:
55aa640f	302	return ops->comm(event, self);
06aae590	303	case PERF_RECORD_FORK:
55aa640f	304	return ops->fork(event, self);
06aae590	305	case PERF_RECORD_EXIT:
55aa640f	306	return ops->exit(event, self);
06aae590	307	case PERF_RECORD_LOST:
55aa640f	308	return ops->lost(event, self);
06aae590	309	case PERF_RECORD_READ:
55aa640f	310	return ops->read(event, self);
06aae590	311	case PERF_RECORD_THROTTLE:
55aa640f	312	return ops->throttle(event, self);
06aae590	313	case PERF_RECORD_UNTHROTTLE:
55aa640f	314	return ops->unthrottle(event, self);
06aae590	315	default:
31d337c4	316	self->unknown_events++;
06aae590 ACM	317	return -1;
	318	}
	319	}
	320
ba21594c ACM	321	void perf_event_header__bswap(struct perf_event_header *self)
	322	{
	323	self->type = bswap_32(self->type);
	324	self->misc = bswap_16(self->misc);
	325	self->size = bswap_16(self->size);
	326	}
	327
	328	int perf_header__read_build_ids(struct perf_header *self,
	329	int input, u64 offset, u64 size)
06aae590 ACM	330	{
	331	struct build_id_event bev;
	332	char filename[PATH_MAX];
	333	u64 limit = offset + size;
	334	int err = -1;
	335
	336	while (offset < limit) {
	337	struct dso *dso;
	338	ssize_t len;
a89e5abe	339	struct list_head *head = &dsos__user;
06aae590 ACM	340
	341	if (read(input, &bev, sizeof(bev)) != sizeof(bev))
	342	goto out;
	343
ba21594c ACM	344	if (self->needs_swap)
	345	perf_event_header__bswap(&bev.header);
	346
06aae590 ACM	347	len = bev.header.size - sizeof(bev);
	348	if (read(input, filename, len) != len)
	349	goto out;
	350
a89e5abe ACM	351	if (bev.header.misc & PERF_RECORD_MISC_KERNEL)
	352	head = &dsos__kernel;
	353
	354	dso = __dsos__findnew(head, filename);
b7cece76	355	if (dso != NULL) {
06aae590	356	dso__set_build_id(dso, &bev.build_id);
b7cece76 ACM	357	if (head == &dsos__kernel && filename[0] == '[')
	358	dso->kernel = 1;
	359	}
06aae590 ACM	360
	361	offset += bev.header.size;
	362	}
	363	err = 0;
	364	out:
	365	return err;
	366	}
	367
	368	static struct thread perf_session__register_idle_thread(struct perf_session self)
	369	{
	370	struct thread *thread = perf_session__findnew(self, 0);
	371
	372	if (thread == NULL \|\| thread__set_comm(thread, "swapper")) {
	373	pr_err("problem inserting idle task.\n");
	374	thread = NULL;
	375	}
	376
	377	return thread;
	378	}
	379
	380	int perf_session__process_events(struct perf_session *self,
	381	struct perf_event_ops *ops)
	382	{
ba21594c ACM	383	int err, mmap_prot, mmap_flags;
	384	u64 head, shift;
	385	u64 offset = 0;
06aae590 ACM	386	size_t page_size;
	387	event_t *event;
	388	uint32_t size;
	389	char *buf;
	390
	391	if (perf_session__register_idle_thread(self) == NULL)
	392	return -ENOMEM;
	393
	394	perf_event_ops__fill_defaults(ops);
	395
1b75962e	396	page_size = sysconf(_SC_PAGESIZE);
06aae590 ACM	397
06aae590 ACM	398	head = self->header.data_offset;
06aae590	399
f7d87444	400	if (!symbol_conf.full_paths) {
06aae590 ACM	401	char bf[PATH_MAX];
	402
	403	if (getcwd(bf, sizeof(bf)) == NULL) {
	404	err = -errno;
	405	out_getcwd_err:
	406	pr_err("failed to get the current directory\n");
	407	goto out_err;
	408	}
	409	self->cwd = strdup(bf);
	410	if (self->cwd == NULL) {
	411	err = -ENOMEM;
	412	goto out_getcwd_err;
	413	}
	414	self->cwdlen = strlen(self->cwd);
	415	}
	416
	417	shift = page_size * (head / page_size);
	418	offset += shift;
	419	head -= shift;
	420
ba21594c ACM	421	mmap_prot = PROT_READ;
	422	mmap_flags = MAP_SHARED;
	423
	424	if (self->header.needs_swap) {
	425	mmap_prot \|= PROT_WRITE;
	426	mmap_flags = MAP_PRIVATE;
	427	}
06aae590	428	remap:
ba21594c ACM	429	buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
ba21594c ACM	430	mmap_flags, self->fd, offset);
06aae590 ACM	431	if (buf == MAP_FAILED) {
	432	pr_err("failed to mmap file\n");
	433	err = -errno;
	434	goto out_err;
	435	}
	436
	437	more:
	438	event = (event_t *)(buf + head);
	439
ba21594c ACM	440	if (self->header.needs_swap)
ba21594c ACM	441	perf_event_header__bswap(&event->header);
06aae590 ACM	442	size = event->header.size;
	443	if (size == 0)
	444	size = 8;
	445
	446	if (head + event->header.size >= page_size * self->mmap_window) {
	447	int munmap_ret;
	448
	449	shift = page_size * (head / page_size);
	450
	451	munmap_ret = munmap(buf, page_size * self->mmap_window);
	452	assert(munmap_ret == 0);
	453
	454	offset += shift;
	455	head -= shift;
	456	goto remap;
	457	}
	458
	459	size = event->header.size;
	460
ba21594c	461	dump_printf("\n%#Lx [%#x]: event: %d\n",
0d755034	462	offset + head, event->header.size, event->header.type);
06aae590 ACM	463
	464	if (size == 0 \|\|
	465	perf_session__process_event(self, event, ops, offset, head) < 0) {
ba21594c	466	dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
0d755034	467	offset + head, event->header.size,
06aae590 ACM	468	event->header.type);
	469	/*
	470	* assume we lost track of the stream, check alignment, and
	471	* increment a single u64 in the hope to catch on again 'soon'.
	472	*/
	473	if (unlikely(head & 7))
	474	head &= ~7ULL;
	475
	476	size = 8;
	477	}
	478
	479	head += size;
	480
	481	if (offset + head >= self->header.data_offset + self->header.data_size)
	482	goto done;
	483
	484	if (offset + head < self->size)
	485	goto more;
	486	done:
	487	err = 0;
	488	out_err:
	489	return err;
	490	}
27295592	491
d549c769	492	bool perf_session__has_traces(struct perf_session self, const char msg)
27295592 ACM	493	{
27295592 ACM	494	if (!(self->sample_type & PERF_SAMPLE_RAW)) {
d549c769 ACM	495	pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
d549c769 ACM	496	return false;
27295592 ACM	497	}
27295592 ACM	498
d549c769	499	return true;
27295592	500	}
56b03f3c ACM	501
	502	int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
	503	const char *symbol_name,
	504	u64 addr)
	505	{
	506	char *bracket;
	507
	508	self->ref_reloc_sym.name = strdup(symbol_name);
	509	if (self->ref_reloc_sym.name == NULL)
	510	return -ENOMEM;
	511
	512	bracket = strchr(self->ref_reloc_sym.name, ']');
	513	if (bracket)
	514	*bracket = '\0';
	515
	516	self->ref_reloc_sym.addr = addr;
	517	return 0;
	518	}
	519
	520	static u64 map__reloc_map_ip(struct map *map, u64 ip)
	521	{
	522	return ip + (s64)map->pgoff;
	523	}
	524
	525	static u64 map__reloc_unmap_ip(struct map *map, u64 ip)
	526	{
	527	return ip - (s64)map->pgoff;
	528	}
	529
	530	void perf_session__reloc_vmlinux_maps(struct perf_session *self,
	531	u64 unrelocated_addr)
	532	{
	533	enum map_type type;
	534	s64 reloc = unrelocated_addr - self->ref_reloc_sym.addr;
	535
	536	if (!reloc)
	537	return;
	538
	539	for (type = 0; type < MAP__NR_TYPES; ++type) {
	540	struct map *map = self->vmlinux_maps[type];
	541
	542	map->map_ip = map__reloc_map_ip;
	543	map->unmap_ip = map__reloc_unmap_ip;
	544	map->pgoff = reloc;
	545	}
	546	}