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

#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;

	if (!strcmp(self->filename, "-")) {
		self->fd_pipe = true;
		self->fd = STDIN_FILENO;

		if (perf_header__read(self, self->fd) < 0)
			pr_err("incompatible file format");

		return 0;
	}

	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, 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;
}

void perf_session__update_sample_type(struct perf_session *self)
{
	self->sample_type = perf_header__sample_type(&self->header);
}

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->stats_by_id = 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;
	}

	perf_session__update_sample_type(self);
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 map_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;
	unsigned int i;
	struct map_symbol *syms = calloc(chain->nr, sizeof(*syms));

	if (!syms)
		return NULL;

	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].map = al.map;
			syms[i].sym = 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;
	if (handler->attr == NULL)
		handler->attr = process_event_stub;
	if (handler->event_type == NULL)
		handler->event_type = 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",
	[PERF_RECORD_HEADER_ATTR]	 = "ATTR",
	[PERF_RECORD_HEADER_EVENT_TYPE]	 = "EVENT_TYPE",
};

unsigned long event__total[PERF_RECORD_HEADER_MAX];

void event__print_totals(void)
{
	int i;
	for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
		if (!event__name[i])
			continue;
		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);
}

static void event__attr_swap(event_t *self)
{
	size_t size;

	self->attr.attr.type		= bswap_32(self->attr.attr.type);
	self->attr.attr.size		= bswap_32(self->attr.attr.size);
	self->attr.attr.config		= bswap_64(self->attr.attr.config);
	self->attr.attr.sample_period	= bswap_64(self->attr.attr.sample_period);
	self->attr.attr.sample_type	= bswap_64(self->attr.attr.sample_type);
	self->attr.attr.read_format	= bswap_64(self->attr.attr.read_format);
	self->attr.attr.wakeup_events	= bswap_32(self->attr.attr.wakeup_events);
	self->attr.attr.bp_type		= bswap_32(self->attr.attr.bp_type);
	self->attr.attr.bp_addr		= bswap_64(self->attr.attr.bp_addr);
	self->attr.attr.bp_len		= bswap_64(self->attr.attr.bp_len);

	size = self->header.size;
	size -= (void *)&self->attr.id - (void *)self;
	mem_bswap_64(self->attr.id, size);
}

static void event__event_type_swap(event_t *self)
{
	self->event_type.event_type.event_id =
		bswap_64(self->event_type.event_type.event_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_HEADER_ATTR]   = event__attr_swap,
	[PERF_RECORD_HEADER_EVENT_TYPE]   = event__event_type_swap,
	[PERF_RECORD_HEADER_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_HEADER_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);
	case PERF_RECORD_HEADER_ATTR:
		return ops->attr(event, self);
	case PERF_RECORD_HEADER_EVENT_TYPE:
		return ops->event_type(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 do_read(int fd, void *buf, size_t size)
{
	void *buf_start = buf;

	while (size) {
		int ret = read(fd, buf, size);

		if (ret <= 0)
			return ret;

		size -= ret;
		buf += ret;
	}

	return buf - buf_start;
}

#define session_done()	(*(volatile int *)(&session_done))
volatile int session_done;

static int __perf_session__process_pipe_events(struct perf_session *self,
					       struct perf_event_ops *ops)
{
	event_t event;
	uint32_t size;
	int skip = 0;
	u64 head;
	int err;
	void *p;

	perf_event_ops__fill_defaults(ops);

	head = 0;
more:
	err = do_read(self->fd, &event, sizeof(struct perf_event_header));
	if (err <= 0) {
		if (err == 0)
			goto done;

		pr_err("failed to read event header\n");
		goto out_err;
	}

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

	size = event.header.size;
	if (size == 0)
		size = 8;

	p = &event;
	p += sizeof(struct perf_event_header);

	err = do_read(self->fd, p, size - sizeof(struct perf_event_header));
	if (err <= 0) {
		if (err == 0) {
			pr_err("unexpected end of event stream\n");
			goto done;
		}

		pr_err("failed to read event data\n");
		goto out_err;
	}

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

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

	if (skip > 0)
		head += skip;

	if (!session_done())
		goto more;
done:
	err = 0;
out_err:
	return err;
}

int __perf_session__process_events(struct perf_session *self,
				   u64 data_offset, u64 data_size,
				   u64 file_size, 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;
	struct ui_progress *progress = ui_progress__new("Processing events...",
							self->size);
	if (progress == NULL)
		return -1;

	perf_event_ops__fill_defaults(ops);

	page_size = sysconf(_SC_PAGESIZE);

	head = data_offset;
	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);
	ui_progress__update(progress, offset);

	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 >= data_offset + data_size)
		goto done;

	if (offset + head < file_size)
		goto more;
done:
	err = 0;
out_err:
	ui_progress__delete(progress);
	return err;
}

int perf_session__process_events(struct perf_session *self,
				 struct perf_event_ops *ops)
{
	int err;

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

	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);
	}

	if (!self->fd_pipe)
		err = __perf_session__process_events(self,
						     self->header.data_offset,
						     self->header.data_size,
						     self->size, ops);
	else
		err = __perf_session__process_pipe_events(self, ops);
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;
	enum map_type i;

	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;

	for (i = 0; i < MAP__NR_TYPES; ++i) {
		struct kmap *kmap = map__kmap(self->vmlinux_maps[i]);
		kmap->ref_reloc_sym = &self->ref_reloc_sym;
	}

	return 0;
}
Commit	Line	Data
b8f46c5a XG	1	#define _FILE_OFFSET_BITS 64
b8f46c5a XG	2
94c744b6 ACM	3	#include <linux/kernel.h>
94c744b6 ACM	4
ba21594c	5	#include <byteswap.h>
94c744b6 ACM	6	#include <unistd.h>
	7	#include <sys/types.h>
	8
	9	#include "session.h"
a328626b	10	#include "sort.h"
94c744b6 ACM	11	#include "util.h"
	12
	13	static int perf_session__open(struct perf_session *self, bool force)
	14	{
	15	struct stat input_stat;
	16
8dc58101 TZ	17	if (!strcmp(self->filename, "-")) {
	18	self->fd_pipe = true;
	19	self->fd = STDIN_FILENO;
	20
	21	if (perf_header__read(self, self->fd) < 0)
	22	pr_err("incompatible file format");
	23
	24	return 0;
	25	}
	26
f887f301	27	self->fd = open(self->filename, O_RDONLY);
94c744b6 ACM	28	if (self->fd < 0) {
	29	pr_err("failed to open file: %s", self->filename);
	30	if (!strcmp(self->filename, "perf.data"))
	31	pr_err(" (try 'perf record' first)");
	32	pr_err("\n");
	33	return -errno;
	34	}
	35
	36	if (fstat(self->fd, &input_stat) < 0)
	37	goto out_close;
	38
	39	if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
	40	pr_err("file %s not owned by current user or root\n",
	41	self->filename);
	42	goto out_close;
	43	}
	44
	45	if (!input_stat.st_size) {
	46	pr_info("zero-sized file (%s), nothing to do!\n",
	47	self->filename);
	48	goto out_close;
	49	}
	50
8dc58101	51	if (perf_header__read(self, self->fd) < 0) {
94c744b6 ACM	52	pr_err("incompatible file format");
	53	goto out_close;
	54	}
	55
	56	self->size = input_stat.st_size;
	57	return 0;
	58
	59	out_close:
	60	close(self->fd);
	61	self->fd = -1;
	62	return -1;
	63	}
	64
8dc58101 TZ	65	void perf_session__update_sample_type(struct perf_session *self)
	66	{
	67	self->sample_type = perf_header__sample_type(&self->header);
	68	}
	69
75be6cf4	70	struct perf_session perf_session__new(const char filename, int mode, bool force)
94c744b6	71	{
b3165f41	72	size_t len = filename ? strlen(filename) + 1 : 0;
94c744b6 ACM	73	struct perf_session self = zalloc(sizeof(self) + len);
	74
	75	if (self == NULL)
	76	goto out;
	77
	78	if (perf_header__init(&self->header) < 0)
4aa65636	79	goto out_free;
94c744b6 ACM	80
94c744b6 ACM	81	memcpy(self->filename, filename, len);
b3165f41	82	self->threads = RB_ROOT;
cb8f0939	83	self->stats_by_id = RB_ROOT;
b3165f41	84	self->last_match = NULL;
ec913369 ACM	85	self->mmap_window = 32;
	86	self->cwd = NULL;
	87	self->cwdlen = 0;
31d337c4	88	self->unknown_events = 0;
4aa65636	89	map_groups__init(&self->kmaps);
94c744b6	90
64abebf7 ACM	91	if (mode == O_RDONLY) {
	92	if (perf_session__open(self, force) < 0)
	93	goto out_delete;
	94	} else if (mode == O_WRONLY) {
	95	/*
	96	* In O_RDONLY mode this will be performed when reading the
	97	* kernel MMAP event, in event__process_mmap().
	98	*/
	99	if (perf_session__create_kernel_maps(self) < 0)
	100	goto out_delete;
	101	}
d549c769	102
8dc58101	103	perf_session__update_sample_type(self);
94c744b6 ACM	104	out:
94c744b6 ACM	105	return self;
4aa65636	106	out_free:
94c744b6 ACM	107	free(self);
94c744b6 ACM	108	return NULL;
4aa65636 ACM	109	out_delete:
	110	perf_session__delete(self);
	111	return NULL;
94c744b6 ACM	112	}
	113
	114	void perf_session__delete(struct perf_session *self)
	115	{
	116	perf_header__exit(&self->header);
	117	close(self->fd);
ec913369	118	free(self->cwd);
94c744b6 ACM	119	free(self);
94c744b6 ACM	120	}
a328626b ACM	121
	122	static bool symbol__match_parent_regex(struct symbol *sym)
	123	{
	124	if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
	125	return 1;
	126
	127	return 0;
	128	}
	129
b3c9ac08 ACM	130	struct map_symbol perf_session__resolve_callchain(struct perf_session self,
	131	struct thread *thread,
	132	struct ip_callchain *chain,
	133	struct symbol **parent)
a328626b ACM	134	{
a328626b ACM	135	u8 cpumode = PERF_RECORD_MISC_USER;
a328626b	136	unsigned int i;
ad5b217b	137	struct map_symbol syms = calloc(chain->nr, sizeof(syms));
a328626b	138
ad5b217b ACM	139	if (!syms)
ad5b217b ACM	140	return NULL;
a328626b ACM	141
	142	for (i = 0; i < chain->nr; i++) {
	143	u64 ip = chain->ips[i];
	144	struct addr_location al;
	145
	146	if (ip >= PERF_CONTEXT_MAX) {
	147	switch (ip) {
	148	case PERF_CONTEXT_HV:
	149	cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
	150	case PERF_CONTEXT_KERNEL:
	151	cpumode = PERF_RECORD_MISC_KERNEL; break;
	152	case PERF_CONTEXT_USER:
	153	cpumode = PERF_RECORD_MISC_USER; break;
	154	default:
	155	break;
	156	}
	157	continue;
	158	}
	159
	160	thread__find_addr_location(thread, self, cpumode,
	161	MAP__FUNCTION, ip, &al, NULL);
	162	if (al.sym != NULL) {
	163	if (sort__has_parent && !*parent &&
	164	symbol__match_parent_regex(al.sym))
	165	*parent = al.sym;
d599db3f	166	if (!symbol_conf.use_callchain)
a328626b	167	break;
b3c9ac08 ACM	168	syms[i].map = al.map;
b3c9ac08 ACM	169	syms[i].sym = al.sym;
a328626b ACM	170	}
	171	}
	172
	173	return syms;
	174	}
06aae590 ACM	175
	176	static int process_event_stub(event_t *event __used,
	177	struct perf_session *session __used)
	178	{
	179	dump_printf(": unhandled!\n");
	180	return 0;
	181	}
	182
	183	static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
	184	{
55aa640f ACM	185	if (handler->sample == NULL)
	186	handler->sample = process_event_stub;
	187	if (handler->mmap == NULL)
	188	handler->mmap = process_event_stub;
	189	if (handler->comm == NULL)
	190	handler->comm = process_event_stub;
	191	if (handler->fork == NULL)
	192	handler->fork = process_event_stub;
	193	if (handler->exit == NULL)
	194	handler->exit = process_event_stub;
	195	if (handler->lost == NULL)
	196	handler->lost = process_event_stub;
	197	if (handler->read == NULL)
	198	handler->read = process_event_stub;
	199	if (handler->throttle == NULL)
	200	handler->throttle = process_event_stub;
	201	if (handler->unthrottle == NULL)
	202	handler->unthrottle = process_event_stub;
2c46dbb5 TZ	203	if (handler->attr == NULL)
2c46dbb5 TZ	204	handler->attr = process_event_stub;
cd19a035 TZ	205	if (handler->event_type == NULL)
cd19a035 TZ	206	handler->event_type = process_event_stub;
06aae590 ACM	207	}
	208
	209	static const char *event__name[] = {
	210	[0] = "TOTAL",
	211	[PERF_RECORD_MMAP] = "MMAP",
	212	[PERF_RECORD_LOST] = "LOST",
	213	[PERF_RECORD_COMM] = "COMM",
	214	[PERF_RECORD_EXIT] = "EXIT",
	215	[PERF_RECORD_THROTTLE] = "THROTTLE",
	216	[PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
	217	[PERF_RECORD_FORK] = "FORK",
	218	[PERF_RECORD_READ] = "READ",
	219	[PERF_RECORD_SAMPLE] = "SAMPLE",
2c46dbb5	220	[PERF_RECORD_HEADER_ATTR] = "ATTR",
cd19a035	221	[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
06aae590 ACM	222	};
06aae590 ACM	223
8dc58101	224	unsigned long event__total[PERF_RECORD_HEADER_MAX];
06aae590 ACM	225
	226	void event__print_totals(void)
	227	{
	228	int i;
8dc58101 TZ	229	for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
	230	if (!event__name[i])
	231	continue;
06aae590 ACM	232	pr_info("%10s events: %10ld\n",
06aae590 ACM	233	event__name[i], event__total[i]);
8dc58101	234	}
06aae590 ACM	235	}
06aae590 ACM	236
ba21594c ACM	237	void mem_bswap_64(void *src, int byte_size)
	238	{
	239	u64 *m = src;
	240
	241	while (byte_size > 0) {
	242	m = bswap_64(m);
	243	byte_size -= sizeof(u64);
	244	++m;
	245	}
	246	}
	247
	248	static void event__all64_swap(event_t *self)
	249	{
	250	struct perf_event_header *hdr = &self->header;
	251	mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
	252	}
	253
	254	static void event__comm_swap(event_t *self)
	255	{
	256	self->comm.pid = bswap_32(self->comm.pid);
	257	self->comm.tid = bswap_32(self->comm.tid);
	258	}
	259
	260	static void event__mmap_swap(event_t *self)
	261	{
	262	self->mmap.pid = bswap_32(self->mmap.pid);
	263	self->mmap.tid = bswap_32(self->mmap.tid);
	264	self->mmap.start = bswap_64(self->mmap.start);
	265	self->mmap.len = bswap_64(self->mmap.len);
	266	self->mmap.pgoff = bswap_64(self->mmap.pgoff);
	267	}
	268
	269	static void event__task_swap(event_t *self)
	270	{
	271	self->fork.pid = bswap_32(self->fork.pid);
	272	self->fork.tid = bswap_32(self->fork.tid);
	273	self->fork.ppid = bswap_32(self->fork.ppid);
	274	self->fork.ptid = bswap_32(self->fork.ptid);
	275	self->fork.time = bswap_64(self->fork.time);
	276	}
	277
	278	static void event__read_swap(event_t *self)
	279	{
	280	self->read.pid = bswap_32(self->read.pid);
	281	self->read.tid = bswap_32(self->read.tid);
	282	self->read.value = bswap_64(self->read.value);
	283	self->read.time_enabled = bswap_64(self->read.time_enabled);
	284	self->read.time_running = bswap_64(self->read.time_running);
	285	self->read.id = bswap_64(self->read.id);
	286	}
	287
2c46dbb5 TZ	288	static void event__attr_swap(event_t *self)
	289	{
	290	size_t size;
	291
	292	self->attr.attr.type = bswap_32(self->attr.attr.type);
	293	self->attr.attr.size = bswap_32(self->attr.attr.size);
	294	self->attr.attr.config = bswap_64(self->attr.attr.config);
	295	self->attr.attr.sample_period = bswap_64(self->attr.attr.sample_period);
	296	self->attr.attr.sample_type = bswap_64(self->attr.attr.sample_type);
	297	self->attr.attr.read_format = bswap_64(self->attr.attr.read_format);
	298	self->attr.attr.wakeup_events = bswap_32(self->attr.attr.wakeup_events);
	299	self->attr.attr.bp_type = bswap_32(self->attr.attr.bp_type);
	300	self->attr.attr.bp_addr = bswap_64(self->attr.attr.bp_addr);
	301	self->attr.attr.bp_len = bswap_64(self->attr.attr.bp_len);
	302
	303	size = self->header.size;
	304	size -= (void )&self->attr.id - (void )self;
	305	mem_bswap_64(self->attr.id, size);
	306	}
	307
cd19a035 TZ	308	static void event__event_type_swap(event_t *self)
	309	{
	310	self->event_type.event_type.event_id =
	311	bswap_64(self->event_type.event_type.event_id);
	312	}
	313
ba21594c ACM	314	typedef void (event__swap_op)(event_t self);
	315
	316	static event__swap_op event__swap_ops[] = {
	317	[PERF_RECORD_MMAP] = event__mmap_swap,
	318	[PERF_RECORD_COMM] = event__comm_swap,
	319	[PERF_RECORD_FORK] = event__task_swap,
	320	[PERF_RECORD_EXIT] = event__task_swap,
	321	[PERF_RECORD_LOST] = event__all64_swap,
	322	[PERF_RECORD_READ] = event__read_swap,
	323	[PERF_RECORD_SAMPLE] = event__all64_swap,
2c46dbb5	324	[PERF_RECORD_HEADER_ATTR] = event__attr_swap,
cd19a035	325	[PERF_RECORD_HEADER_EVENT_TYPE] = event__event_type_swap,
8dc58101	326	[PERF_RECORD_HEADER_MAX] = NULL,
ba21594c ACM	327	};
ba21594c ACM	328
06aae590 ACM	329	static int perf_session__process_event(struct perf_session *self,
	330	event_t *event,
	331	struct perf_event_ops *ops,
ba21594c	332	u64 offset, u64 head)
06aae590 ACM	333	{
	334	trace_event(event);
	335
8dc58101	336	if (event->header.type < PERF_RECORD_HEADER_MAX) {
ba21594c	337	dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
0d755034	338	offset + head, event->header.size,
06aae590 ACM	339	event__name[event->header.type]);
	340	++event__total[0];
	341	++event__total[event->header.type];
	342	}
	343
ba21594c ACM	344	if (self->header.needs_swap && event__swap_ops[event->header.type])
	345	event__swap_ops[event->header.type](event);
	346
06aae590 ACM	347	switch (event->header.type) {
06aae590 ACM	348	case PERF_RECORD_SAMPLE:
55aa640f	349	return ops->sample(event, self);
06aae590	350	case PERF_RECORD_MMAP:
55aa640f	351	return ops->mmap(event, self);
06aae590	352	case PERF_RECORD_COMM:
55aa640f	353	return ops->comm(event, self);
06aae590	354	case PERF_RECORD_FORK:
55aa640f	355	return ops->fork(event, self);
06aae590	356	case PERF_RECORD_EXIT:
55aa640f	357	return ops->exit(event, self);
06aae590	358	case PERF_RECORD_LOST:
55aa640f	359	return ops->lost(event, self);
06aae590	360	case PERF_RECORD_READ:
55aa640f	361	return ops->read(event, self);
06aae590	362	case PERF_RECORD_THROTTLE:
55aa640f	363	return ops->throttle(event, self);
06aae590	364	case PERF_RECORD_UNTHROTTLE:
55aa640f	365	return ops->unthrottle(event, self);
2c46dbb5 TZ	366	case PERF_RECORD_HEADER_ATTR:
2c46dbb5 TZ	367	return ops->attr(event, self);
cd19a035 TZ	368	case PERF_RECORD_HEADER_EVENT_TYPE:
cd19a035 TZ	369	return ops->event_type(event, self);
06aae590	370	default:
31d337c4	371	self->unknown_events++;
06aae590 ACM	372	return -1;
	373	}
	374	}
	375
ba21594c ACM	376	void perf_event_header__bswap(struct perf_event_header *self)
	377	{
	378	self->type = bswap_32(self->type);
	379	self->misc = bswap_16(self->misc);
	380	self->size = bswap_16(self->size);
	381	}
	382
	383	int perf_header__read_build_ids(struct perf_header *self,
	384	int input, u64 offset, u64 size)
06aae590 ACM	385	{
	386	struct build_id_event bev;
	387	char filename[PATH_MAX];
	388	u64 limit = offset + size;
	389	int err = -1;
	390
	391	while (offset < limit) {
	392	struct dso *dso;
	393	ssize_t len;
a89e5abe	394	struct list_head *head = &dsos__user;
06aae590 ACM	395
	396	if (read(input, &bev, sizeof(bev)) != sizeof(bev))
	397	goto out;
	398
ba21594c ACM	399	if (self->needs_swap)
	400	perf_event_header__bswap(&bev.header);
	401
06aae590 ACM	402	len = bev.header.size - sizeof(bev);
	403	if (read(input, filename, len) != len)
	404	goto out;
	405
a89e5abe ACM	406	if (bev.header.misc & PERF_RECORD_MISC_KERNEL)
	407	head = &dsos__kernel;
	408
	409	dso = __dsos__findnew(head, filename);
b7cece76	410	if (dso != NULL) {
06aae590	411	dso__set_build_id(dso, &bev.build_id);
b7cece76 ACM	412	if (head == &dsos__kernel && filename[0] == '[')
	413	dso->kernel = 1;
	414	}
06aae590 ACM	415
	416	offset += bev.header.size;
	417	}
	418	err = 0;
	419	out:
	420	return err;
	421	}
	422
	423	static struct thread perf_session__register_idle_thread(struct perf_session self)
	424	{
	425	struct thread *thread = perf_session__findnew(self, 0);
	426
	427	if (thread == NULL \|\| thread__set_comm(thread, "swapper")) {
	428	pr_err("problem inserting idle task.\n");
	429	thread = NULL;
	430	}
	431
	432	return thread;
	433	}
	434
8dc58101 TZ	435	int do_read(int fd, void *buf, size_t size)
	436	{
	437	void *buf_start = buf;
	438
	439	while (size) {
	440	int ret = read(fd, buf, size);
	441
	442	if (ret <= 0)
	443	return ret;
	444
	445	size -= ret;
	446	buf += ret;
	447	}
	448
	449	return buf - buf_start;
	450	}
	451
	452	#define session_done() ((volatile int )(&session_done))
	453	volatile int session_done;
	454
	455	static int __perf_session__process_pipe_events(struct perf_session *self,
	456	struct perf_event_ops *ops)
	457	{
	458	event_t event;
	459	uint32_t size;
	460	int skip = 0;
	461	u64 head;
	462	int err;
	463	void *p;
	464
	465	perf_event_ops__fill_defaults(ops);
	466
	467	head = 0;
	468	more:
	469	err = do_read(self->fd, &event, sizeof(struct perf_event_header));
	470	if (err <= 0) {
	471	if (err == 0)
	472	goto done;
	473
	474	pr_err("failed to read event header\n");
	475	goto out_err;
	476	}
	477
	478	if (self->header.needs_swap)
	479	perf_event_header__bswap(&event.header);
	480
	481	size = event.header.size;
	482	if (size == 0)
	483	size = 8;
	484
	485	p = &event;
	486	p += sizeof(struct perf_event_header);
	487
	488	err = do_read(self->fd, p, size - sizeof(struct perf_event_header));
	489	if (err <= 0) {
	490	if (err == 0) {
	491	pr_err("unexpected end of event stream\n");
	492	goto done;
	493	}
	494
	495	pr_err("failed to read event data\n");
	496	goto out_err;
	497	}
	498
499	if (size == 0 \|\|
500	(skip = perf_session__process_event(self, &event, ops,
501	0, head)) < 0) {
502	dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
503	head, event.header.size, event.header.type);
504	/*
505	* assume we lost track of the stream, check alignment, and
506	* increment a single u64 in the hope to catch on again 'soon'.
507	*/
508	if (unlikely(head & 7))
509	head &= ~7ULL;
510
511	size = 8;
512	}
513
514	head += size;
515
516	dump_printf("\n%#Lx [%#x]: event: %d\n",
517	head, event.header.size, event.header.type);
518
519	if (skip > 0)
520	head += skip;
521
522	if (!session_done())
523	goto more;
524	done:
525	err = 0;
526	out_err:
527	return err;
528	}
529
6122e4e4 ACM	530	int __perf_session__process_events(struct perf_session *self,
	531	u64 data_offset, u64 data_size,
	532	u64 file_size, struct perf_event_ops *ops)
06aae590	533	{
ba21594c ACM	534	int err, mmap_prot, mmap_flags;
	535	u64 head, shift;
	536	u64 offset = 0;
06aae590 ACM	537	size_t page_size;
	538	event_t *event;
	539	uint32_t size;
	540	char *buf;
5f4d3f88 ACM	541	struct ui_progress *progress = ui_progress__new("Processing events...",
	542	self->size);
	543	if (progress == NULL)
	544	return -1;
06aae590	545
06aae590 ACM	546	perf_event_ops__fill_defaults(ops);
06aae590 ACM	547
1b75962e	548	page_size = sysconf(_SC_PAGESIZE);
06aae590	549
6122e4e4	550	head = data_offset;
06aae590 ACM	551	shift = page_size * (head / page_size);
	552	offset += shift;
	553	head -= shift;
	554
ba21594c ACM	555	mmap_prot = PROT_READ;
	556	mmap_flags = MAP_SHARED;
	557
	558	if (self->header.needs_swap) {
	559	mmap_prot \|= PROT_WRITE;
	560	mmap_flags = MAP_PRIVATE;
	561	}
06aae590	562	remap:
ba21594c ACM	563	buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
ba21594c ACM	564	mmap_flags, self->fd, offset);
06aae590 ACM	565	if (buf == MAP_FAILED) {
	566	pr_err("failed to mmap file\n");
	567	err = -errno;
	568	goto out_err;
	569	}
	570
	571	more:
	572	event = (event_t *)(buf + head);
5f4d3f88	573	ui_progress__update(progress, offset);
06aae590	574
ba21594c ACM	575	if (self->header.needs_swap)
ba21594c ACM	576	perf_event_header__bswap(&event->header);
06aae590 ACM	577	size = event->header.size;
	578	if (size == 0)
	579	size = 8;
	580
	581	if (head + event->header.size >= page_size * self->mmap_window) {
	582	int munmap_ret;
	583
	584	shift = page_size * (head / page_size);
	585
	586	munmap_ret = munmap(buf, page_size * self->mmap_window);
	587	assert(munmap_ret == 0);
	588
	589	offset += shift;
	590	head -= shift;
	591	goto remap;
	592	}
	593
	594	size = event->header.size;
	595
ba21594c	596	dump_printf("\n%#Lx [%#x]: event: %d\n",
0d755034	597	offset + head, event->header.size, event->header.type);
06aae590 ACM	598
	599	if (size == 0 \|\|
	600	perf_session__process_event(self, event, ops, offset, head) < 0) {
ba21594c	601	dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
0d755034	602	offset + head, event->header.size,
06aae590 ACM	603	event->header.type);
	604	/*
	605	* assume we lost track of the stream, check alignment, and
	606	* increment a single u64 in the hope to catch on again 'soon'.
	607	*/
	608	if (unlikely(head & 7))
	609	head &= ~7ULL;
	610
	611	size = 8;
	612	}
	613
	614	head += size;
	615
6122e4e4	616	if (offset + head >= data_offset + data_size)
06aae590 ACM	617	goto done;
06aae590 ACM	618
6122e4e4	619	if (offset + head < file_size)
06aae590 ACM	620	goto more;
	621	done:
	622	err = 0;
	623	out_err:
5f4d3f88	624	ui_progress__delete(progress);
06aae590 ACM	625	return err;
06aae590 ACM	626	}
27295592	627
6122e4e4 ACM	628	int perf_session__process_events(struct perf_session *self,
	629	struct perf_event_ops *ops)
	630	{
	631	int err;
	632
	633	if (perf_session__register_idle_thread(self) == NULL)
	634	return -ENOMEM;
	635
	636	if (!symbol_conf.full_paths) {
	637	char bf[PATH_MAX];
	638
	639	if (getcwd(bf, sizeof(bf)) == NULL) {
	640	err = -errno;
	641	out_getcwd_err:
	642	pr_err("failed to get the current directory\n");
	643	goto out_err;
	644	}
	645	self->cwd = strdup(bf);
	646	if (self->cwd == NULL) {
	647	err = -ENOMEM;
	648	goto out_getcwd_err;
	649	}
	650	self->cwdlen = strlen(self->cwd);
	651	}
	652
8dc58101 TZ	653	if (!self->fd_pipe)
	654	err = __perf_session__process_events(self,
	655	self->header.data_offset,
	656	self->header.data_size,
	657	self->size, ops);
	658	else
	659	err = __perf_session__process_pipe_events(self, ops);
6122e4e4 ACM	660	out_err:
	661	return err;
	662	}
	663
d549c769	664	bool perf_session__has_traces(struct perf_session self, const char msg)
27295592 ACM	665	{
27295592 ACM	666	if (!(self->sample_type & PERF_SAMPLE_RAW)) {
d549c769 ACM	667	pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
d549c769 ACM	668	return false;
27295592 ACM	669	}
27295592 ACM	670
d549c769	671	return true;
27295592	672	}
56b03f3c ACM	673
	674	int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
	675	const char *symbol_name,
	676	u64 addr)
	677	{
	678	char *bracket;
9de89fe7	679	enum map_type i;
56b03f3c ACM	680
	681	self->ref_reloc_sym.name = strdup(symbol_name);
	682	if (self->ref_reloc_sym.name == NULL)
	683	return -ENOMEM;
	684
	685	bracket = strchr(self->ref_reloc_sym.name, ']');
	686	if (bracket)
	687	*bracket = '\0';
	688
	689	self->ref_reloc_sym.addr = addr;
9de89fe7 ACM	690
	691	for (i = 0; i < MAP__NR_TYPES; ++i) {
	692	struct kmap *kmap = map__kmap(self->vmlinux_maps[i]);
	693	kmap->ref_reloc_sym = &self->ref_reloc_sym;
	694	}
	695
56b03f3c ACM	696	return 0;
56b03f3c ACM	697	}