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

#define _LARGEFILE64_SOURCE
#define _FILE_OFFSET_BITS 64

#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|O_LARGEFILE);
	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
b8f46c5a XG	1	#define _LARGEFILE64_SOURCE
	2	#define _FILE_OFFSET_BITS 64
	3
94c744b6 ACM	4	#include <linux/kernel.h>
94c744b6 ACM	5
ba21594c	6	#include <byteswap.h>
94c744b6 ACM	7	#include <unistd.h>
	8	#include <sys/types.h>
	9
	10	#include "session.h"
a328626b	11	#include "sort.h"
94c744b6 ACM	12	#include "util.h"
	13
	14	static int perf_session__open(struct perf_session *self, bool force)
	15	{
	16	struct stat input_stat;
	17
b8f46c5a	18	self->fd = open(self->filename, O_RDONLY\|O_LARGEFILE);
94c744b6 ACM	19	if (self->fd < 0) {
	20	pr_err("failed to open file: %s", self->filename);
	21	if (!strcmp(self->filename, "perf.data"))
	22	pr_err(" (try 'perf record' first)");
	23	pr_err("\n");
	24	return -errno;
	25	}
	26
	27	if (fstat(self->fd, &input_stat) < 0)
	28	goto out_close;
	29
	30	if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
	31	pr_err("file %s not owned by current user or root\n",
	32	self->filename);
	33	goto out_close;
	34	}
	35
	36	if (!input_stat.st_size) {
	37	pr_info("zero-sized file (%s), nothing to do!\n",
	38	self->filename);
	39	goto out_close;
	40	}
	41
	42	if (perf_header__read(&self->header, self->fd) < 0) {
	43	pr_err("incompatible file format");
	44	goto out_close;
	45	}
	46
	47	self->size = input_stat.st_size;
	48	return 0;
	49
	50	out_close:
	51	close(self->fd);
	52	self->fd = -1;
	53	return -1;
	54	}
	55
75be6cf4	56	struct perf_session perf_session__new(const char filename, int mode, bool force)
94c744b6	57	{
b3165f41	58	size_t len = filename ? strlen(filename) + 1 : 0;
94c744b6 ACM	59	struct perf_session self = zalloc(sizeof(self) + len);
	60
	61	if (self == NULL)
	62	goto out;
	63
	64	if (perf_header__init(&self->header) < 0)
4aa65636	65	goto out_free;
94c744b6 ACM	66
94c744b6 ACM	67	memcpy(self->filename, filename, len);
b3165f41 ACM	68	self->threads = RB_ROOT;
b3165f41 ACM	69	self->last_match = NULL;
ec913369 ACM	70	self->mmap_window = 32;
	71	self->cwd = NULL;
	72	self->cwdlen = 0;
31d337c4	73	self->unknown_events = 0;
4aa65636	74	map_groups__init(&self->kmaps);
94c744b6	75
64abebf7 ACM	76	if (mode == O_RDONLY) {
	77	if (perf_session__open(self, force) < 0)
	78	goto out_delete;
	79	} else if (mode == O_WRONLY) {
	80	/*
	81	* In O_RDONLY mode this will be performed when reading the
	82	* kernel MMAP event, in event__process_mmap().
	83	*/
	84	if (perf_session__create_kernel_maps(self) < 0)
	85	goto out_delete;
	86	}
d549c769 ACM	87
d549c769 ACM	88	self->sample_type = perf_header__sample_type(&self->header);
94c744b6 ACM	89	out:
94c744b6 ACM	90	return self;
4aa65636	91	out_free:
94c744b6 ACM	92	free(self);
94c744b6 ACM	93	return NULL;
4aa65636 ACM	94	out_delete:
	95	perf_session__delete(self);
	96	return NULL;
94c744b6 ACM	97	}
	98
	99	void perf_session__delete(struct perf_session *self)
	100	{
	101	perf_header__exit(&self->header);
	102	close(self->fd);
ec913369	103	free(self->cwd);
94c744b6 ACM	104	free(self);
94c744b6 ACM	105	}
a328626b ACM	106
	107	static bool symbol__match_parent_regex(struct symbol *sym)
	108	{
	109	if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
	110	return 1;
	111
	112	return 0;
	113	}
	114
	115	struct symbol *perf_session__resolve_callchain(struct perf_session self,
	116	struct thread *thread,
	117	struct ip_callchain *chain,
	118	struct symbol **parent)
	119	{
	120	u8 cpumode = PERF_RECORD_MISC_USER;
	121	struct symbol **syms = NULL;
	122	unsigned int i;
	123
d599db3f	124	if (symbol_conf.use_callchain) {
a328626b ACM	125	syms = calloc(chain->nr, sizeof(*syms));
	126	if (!syms) {
	127	fprintf(stderr, "Can't allocate memory for symbols\n");
	128	exit(-1);
	129	}
	130	}
	131
	132	for (i = 0; i < chain->nr; i++) {
	133	u64 ip = chain->ips[i];
	134	struct addr_location al;
	135
	136	if (ip >= PERF_CONTEXT_MAX) {
	137	switch (ip) {
	138	case PERF_CONTEXT_HV:
	139	cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
	140	case PERF_CONTEXT_KERNEL:
	141	cpumode = PERF_RECORD_MISC_KERNEL; break;
	142	case PERF_CONTEXT_USER:
	143	cpumode = PERF_RECORD_MISC_USER; break;
	144	default:
	145	break;
	146	}
	147	continue;
	148	}
	149
	150	thread__find_addr_location(thread, self, cpumode,
	151	MAP__FUNCTION, ip, &al, NULL);
	152	if (al.sym != NULL) {
	153	if (sort__has_parent && !*parent &&
	154	symbol__match_parent_regex(al.sym))
	155	*parent = al.sym;
d599db3f	156	if (!symbol_conf.use_callchain)
a328626b ACM	157	break;
	158	syms[i] = al.sym;
	159	}
	160	}
	161
	162	return syms;
	163	}
06aae590 ACM	164
	165	static int process_event_stub(event_t *event __used,
	166	struct perf_session *session __used)
	167	{
	168	dump_printf(": unhandled!\n");
	169	return 0;
	170	}
	171
	172	static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
	173	{
55aa640f ACM	174	if (handler->sample == NULL)
	175	handler->sample = process_event_stub;
	176	if (handler->mmap == NULL)
	177	handler->mmap = process_event_stub;
	178	if (handler->comm == NULL)
	179	handler->comm = process_event_stub;
	180	if (handler->fork == NULL)
	181	handler->fork = process_event_stub;
	182	if (handler->exit == NULL)
	183	handler->exit = process_event_stub;
	184	if (handler->lost == NULL)
	185	handler->lost = process_event_stub;
	186	if (handler->read == NULL)
	187	handler->read = process_event_stub;
	188	if (handler->throttle == NULL)
	189	handler->throttle = process_event_stub;
	190	if (handler->unthrottle == NULL)
	191	handler->unthrottle = process_event_stub;
06aae590 ACM	192	}
	193
	194	static const char *event__name[] = {
	195	[0] = "TOTAL",
	196	[PERF_RECORD_MMAP] = "MMAP",
	197	[PERF_RECORD_LOST] = "LOST",
	198	[PERF_RECORD_COMM] = "COMM",
	199	[PERF_RECORD_EXIT] = "EXIT",
	200	[PERF_RECORD_THROTTLE] = "THROTTLE",
	201	[PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
	202	[PERF_RECORD_FORK] = "FORK",
	203	[PERF_RECORD_READ] = "READ",
	204	[PERF_RECORD_SAMPLE] = "SAMPLE",
	205	};
	206
	207	unsigned long event__total[PERF_RECORD_MAX];
	208
	209	void event__print_totals(void)
	210	{
	211	int i;
	212	for (i = 0; i < PERF_RECORD_MAX; ++i)
	213	pr_info("%10s events: %10ld\n",
	214	event__name[i], event__total[i]);
	215	}
	216
ba21594c ACM	217	void mem_bswap_64(void *src, int byte_size)
	218	{
	219	u64 *m = src;
	220
	221	while (byte_size > 0) {
	222	m = bswap_64(m);
	223	byte_size -= sizeof(u64);
	224	++m;
	225	}
	226	}
	227
	228	static void event__all64_swap(event_t *self)
	229	{
	230	struct perf_event_header *hdr = &self->header;
	231	mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
	232	}
	233
	234	static void event__comm_swap(event_t *self)
	235	{
	236	self->comm.pid = bswap_32(self->comm.pid);
	237	self->comm.tid = bswap_32(self->comm.tid);
	238	}
	239
	240	static void event__mmap_swap(event_t *self)
	241	{
	242	self->mmap.pid = bswap_32(self->mmap.pid);
	243	self->mmap.tid = bswap_32(self->mmap.tid);
	244	self->mmap.start = bswap_64(self->mmap.start);
	245	self->mmap.len = bswap_64(self->mmap.len);
	246	self->mmap.pgoff = bswap_64(self->mmap.pgoff);
	247	}
	248
	249	static void event__task_swap(event_t *self)
	250	{
	251	self->fork.pid = bswap_32(self->fork.pid);
	252	self->fork.tid = bswap_32(self->fork.tid);
	253	self->fork.ppid = bswap_32(self->fork.ppid);
	254	self->fork.ptid = bswap_32(self->fork.ptid);
	255	self->fork.time = bswap_64(self->fork.time);
	256	}
	257
	258	static void event__read_swap(event_t *self)
	259	{
	260	self->read.pid = bswap_32(self->read.pid);
	261	self->read.tid = bswap_32(self->read.tid);
	262	self->read.value = bswap_64(self->read.value);
	263	self->read.time_enabled = bswap_64(self->read.time_enabled);
	264	self->read.time_running = bswap_64(self->read.time_running);
	265	self->read.id = bswap_64(self->read.id);
	266	}
	267
	268	typedef void (event__swap_op)(event_t self);
	269
	270	static event__swap_op event__swap_ops[] = {
	271	[PERF_RECORD_MMAP] = event__mmap_swap,
	272	[PERF_RECORD_COMM] = event__comm_swap,
	273	[PERF_RECORD_FORK] = event__task_swap,
	274	[PERF_RECORD_EXIT] = event__task_swap,
	275	[PERF_RECORD_LOST] = event__all64_swap,
	276	[PERF_RECORD_READ] = event__read_swap,
	277	[PERF_RECORD_SAMPLE] = event__all64_swap,
	278	[PERF_RECORD_MAX] = NULL,
	279	};
	280
06aae590 ACM	281	static int perf_session__process_event(struct perf_session *self,
	282	event_t *event,
	283	struct perf_event_ops *ops,
ba21594c	284	u64 offset, u64 head)
06aae590 ACM	285	{
	286	trace_event(event);
	287
	288	if (event->header.type < PERF_RECORD_MAX) {
ba21594c	289	dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
0d755034	290	offset + head, event->header.size,
06aae590 ACM	291	event__name[event->header.type]);
	292	++event__total[0];
	293	++event__total[event->header.type];
	294	}
	295
ba21594c ACM	296	if (self->header.needs_swap && event__swap_ops[event->header.type])
	297	event__swap_ops[event->header.type](event);
	298
06aae590 ACM	299	switch (event->header.type) {
06aae590 ACM	300	case PERF_RECORD_SAMPLE:
55aa640f	301	return ops->sample(event, self);
06aae590	302	case PERF_RECORD_MMAP:
55aa640f	303	return ops->mmap(event, self);
06aae590	304	case PERF_RECORD_COMM:
55aa640f	305	return ops->comm(event, self);
06aae590	306	case PERF_RECORD_FORK:
55aa640f	307	return ops->fork(event, self);
06aae590	308	case PERF_RECORD_EXIT:
55aa640f	309	return ops->exit(event, self);
06aae590	310	case PERF_RECORD_LOST:
55aa640f	311	return ops->lost(event, self);
06aae590	312	case PERF_RECORD_READ:
55aa640f	313	return ops->read(event, self);
06aae590	314	case PERF_RECORD_THROTTLE:
55aa640f	315	return ops->throttle(event, self);
06aae590	316	case PERF_RECORD_UNTHROTTLE:
55aa640f	317	return ops->unthrottle(event, self);
06aae590	318	default:
31d337c4	319	self->unknown_events++;
06aae590 ACM	320	return -1;
	321	}
	322	}
	323
ba21594c ACM	324	void perf_event_header__bswap(struct perf_event_header *self)
	325	{
	326	self->type = bswap_32(self->type);
	327	self->misc = bswap_16(self->misc);
	328	self->size = bswap_16(self->size);
	329	}
	330
	331	int perf_header__read_build_ids(struct perf_header *self,
	332	int input, u64 offset, u64 size)
06aae590 ACM	333	{
	334	struct build_id_event bev;
	335	char filename[PATH_MAX];
	336	u64 limit = offset + size;
	337	int err = -1;
	338
	339	while (offset < limit) {
	340	struct dso *dso;
	341	ssize_t len;
a89e5abe	342	struct list_head *head = &dsos__user;
06aae590 ACM	343
	344	if (read(input, &bev, sizeof(bev)) != sizeof(bev))
	345	goto out;
	346
ba21594c ACM	347	if (self->needs_swap)
	348	perf_event_header__bswap(&bev.header);
	349
06aae590 ACM	350	len = bev.header.size - sizeof(bev);
	351	if (read(input, filename, len) != len)
	352	goto out;
	353
a89e5abe ACM	354	if (bev.header.misc & PERF_RECORD_MISC_KERNEL)
	355	head = &dsos__kernel;
	356
	357	dso = __dsos__findnew(head, filename);
b7cece76	358	if (dso != NULL) {
06aae590	359	dso__set_build_id(dso, &bev.build_id);
b7cece76 ACM	360	if (head == &dsos__kernel && filename[0] == '[')
	361	dso->kernel = 1;
	362	}
06aae590 ACM	363
	364	offset += bev.header.size;
	365	}
	366	err = 0;
	367	out:
	368	return err;
	369	}
	370
	371	static struct thread perf_session__register_idle_thread(struct perf_session self)
	372	{
	373	struct thread *thread = perf_session__findnew(self, 0);
	374
	375	if (thread == NULL \|\| thread__set_comm(thread, "swapper")) {
	376	pr_err("problem inserting idle task.\n");
	377	thread = NULL;
	378	}
	379
	380	return thread;
	381	}
	382
	383	int perf_session__process_events(struct perf_session *self,
	384	struct perf_event_ops *ops)
	385	{
ba21594c ACM	386	int err, mmap_prot, mmap_flags;
	387	u64 head, shift;
	388	u64 offset = 0;
06aae590 ACM	389	size_t page_size;
	390	event_t *event;
	391	uint32_t size;
	392	char *buf;
	393
	394	if (perf_session__register_idle_thread(self) == NULL)
	395	return -ENOMEM;
	396
	397	perf_event_ops__fill_defaults(ops);
	398
1b75962e	399	page_size = sysconf(_SC_PAGESIZE);
06aae590 ACM	400
06aae590 ACM	401	head = self->header.data_offset;
06aae590	402
f7d87444	403	if (!symbol_conf.full_paths) {
06aae590 ACM	404	char bf[PATH_MAX];
	405
	406	if (getcwd(bf, sizeof(bf)) == NULL) {
	407	err = -errno;
	408	out_getcwd_err:
	409	pr_err("failed to get the current directory\n");
	410	goto out_err;
	411	}
	412	self->cwd = strdup(bf);
	413	if (self->cwd == NULL) {
	414	err = -ENOMEM;
	415	goto out_getcwd_err;
	416	}
	417	self->cwdlen = strlen(self->cwd);
	418	}
	419
	420	shift = page_size * (head / page_size);
	421	offset += shift;
	422	head -= shift;
	423
ba21594c ACM	424	mmap_prot = PROT_READ;
	425	mmap_flags = MAP_SHARED;
	426
	427	if (self->header.needs_swap) {
	428	mmap_prot \|= PROT_WRITE;
	429	mmap_flags = MAP_PRIVATE;
	430	}
06aae590	431	remap:
ba21594c ACM	432	buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
ba21594c ACM	433	mmap_flags, self->fd, offset);
06aae590 ACM	434	if (buf == MAP_FAILED) {
	435	pr_err("failed to mmap file\n");
	436	err = -errno;
	437	goto out_err;
	438	}
	439
	440	more:
	441	event = (event_t *)(buf + head);
	442
ba21594c ACM	443	if (self->header.needs_swap)
ba21594c ACM	444	perf_event_header__bswap(&event->header);
06aae590 ACM	445	size = event->header.size;
	446	if (size == 0)
	447	size = 8;
	448
	449	if (head + event->header.size >= page_size * self->mmap_window) {
	450	int munmap_ret;
	451
	452	shift = page_size * (head / page_size);
	453
	454	munmap_ret = munmap(buf, page_size * self->mmap_window);
	455	assert(munmap_ret == 0);
	456
	457	offset += shift;
	458	head -= shift;
	459	goto remap;
	460	}
	461
	462	size = event->header.size;
	463
ba21594c	464	dump_printf("\n%#Lx [%#x]: event: %d\n",
0d755034	465	offset + head, event->header.size, event->header.type);
06aae590 ACM	466
	467	if (size == 0 \|\|
	468	perf_session__process_event(self, event, ops, offset, head) < 0) {
ba21594c	469	dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
0d755034	470	offset + head, event->header.size,
06aae590 ACM	471	event->header.type);
	472	/*
	473	* assume we lost track of the stream, check alignment, and
	474	* increment a single u64 in the hope to catch on again 'soon'.
	475	*/
	476	if (unlikely(head & 7))
	477	head &= ~7ULL;
	478
	479	size = 8;
	480	}
	481
	482	head += size;
	483
	484	if (offset + head >= self->header.data_offset + self->header.data_size)
	485	goto done;
	486
	487	if (offset + head < self->size)
	488	goto more;
	489	done:
	490	err = 0;
	491	out_err:
	492	return err;
	493	}
27295592	494
d549c769	495	bool perf_session__has_traces(struct perf_session self, const char msg)
27295592 ACM	496	{
27295592 ACM	497	if (!(self->sample_type & PERF_SAMPLE_RAW)) {
d549c769 ACM	498	pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
d549c769 ACM	499	return false;
27295592 ACM	500	}
27295592 ACM	501
d549c769	502	return true;
27295592	503	}
56b03f3c ACM	504
	505	int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
	506	const char *symbol_name,
	507	u64 addr)
	508	{
	509	char *bracket;
	510
	511	self->ref_reloc_sym.name = strdup(symbol_name);
	512	if (self->ref_reloc_sym.name == NULL)
	513	return -ENOMEM;
	514
	515	bracket = strchr(self->ref_reloc_sym.name, ']');
	516	if (bracket)
	517	*bracket = '\0';
	518
	519	self->ref_reloc_sym.addr = addr;
	520	return 0;
	521	}
	522
	523	static u64 map__reloc_map_ip(struct map *map, u64 ip)
	524	{
	525	return ip + (s64)map->pgoff;
	526	}
	527
	528	static u64 map__reloc_unmap_ip(struct map *map, u64 ip)
	529	{
	530	return ip - (s64)map->pgoff;
	531	}
	532
	533	void perf_session__reloc_vmlinux_maps(struct perf_session *self,
	534	u64 unrelocated_addr)
	535	{
	536	enum map_type type;
	537	s64 reloc = unrelocated_addr - self->ref_reloc_sym.addr;
	538
	539	if (!reloc)
	540	return;
	541
	542	for (type = 0; type < MAP__NR_TYPES; ++type) {
	543	struct map *map = self->vmlinux_maps[type];
	544
	545	map->map_ip = map__reloc_map_ip;
	546	map->unmap_ip = map__reloc_unmap_ip;
	547	map->pgoff = reloc;
	548	}
	549	}