[deliverable/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;
	if (handler->tracing_data == NULL)
		handler->tracing_data = 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",
	[PERF_RECORD_HEADER_TRACING_DATA]	 = "TRACING_DATA",
};

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);
}

static void event__tracing_data_swap(event_t *self)
{
	self->tracing_data.size = bswap_32(self->tracing_data.size);
}

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_TRACING_DATA]   = event__tracing_data_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);
	case PERF_RECORD_HEADER_TRACING_DATA:
		/* setup for reading amidst mmap */
		lseek(self->fd, offset + head, SEEK_SET);
		return ops->tracing_data(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;
9215545e TZ	207	if (handler->tracing_data == NULL)
9215545e TZ	208	handler->tracing_data = process_event_stub;
06aae590 ACM	209	}
	210
	211	static const char *event__name[] = {
	212	[0] = "TOTAL",
	213	[PERF_RECORD_MMAP] = "MMAP",
	214	[PERF_RECORD_LOST] = "LOST",
	215	[PERF_RECORD_COMM] = "COMM",
	216	[PERF_RECORD_EXIT] = "EXIT",
	217	[PERF_RECORD_THROTTLE] = "THROTTLE",
	218	[PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
	219	[PERF_RECORD_FORK] = "FORK",
	220	[PERF_RECORD_READ] = "READ",
	221	[PERF_RECORD_SAMPLE] = "SAMPLE",
2c46dbb5	222	[PERF_RECORD_HEADER_ATTR] = "ATTR",
cd19a035	223	[PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
9215545e	224	[PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
06aae590 ACM	225	};
06aae590 ACM	226
8dc58101	227	unsigned long event__total[PERF_RECORD_HEADER_MAX];
06aae590 ACM	228
	229	void event__print_totals(void)
	230	{
	231	int i;
8dc58101 TZ	232	for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
	233	if (!event__name[i])
	234	continue;
06aae590 ACM	235	pr_info("%10s events: %10ld\n",
06aae590 ACM	236	event__name[i], event__total[i]);
8dc58101	237	}
06aae590 ACM	238	}
06aae590 ACM	239
ba21594c ACM	240	void mem_bswap_64(void *src, int byte_size)
	241	{
	242	u64 *m = src;
	243
	244	while (byte_size > 0) {
	245	m = bswap_64(m);
	246	byte_size -= sizeof(u64);
	247	++m;
	248	}
	249	}
	250
	251	static void event__all64_swap(event_t *self)
	252	{
	253	struct perf_event_header *hdr = &self->header;
	254	mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
	255	}
	256
	257	static void event__comm_swap(event_t *self)
	258	{
	259	self->comm.pid = bswap_32(self->comm.pid);
	260	self->comm.tid = bswap_32(self->comm.tid);
	261	}
	262
	263	static void event__mmap_swap(event_t *self)
	264	{
	265	self->mmap.pid = bswap_32(self->mmap.pid);
	266	self->mmap.tid = bswap_32(self->mmap.tid);
	267	self->mmap.start = bswap_64(self->mmap.start);
	268	self->mmap.len = bswap_64(self->mmap.len);
	269	self->mmap.pgoff = bswap_64(self->mmap.pgoff);
	270	}
	271
	272	static void event__task_swap(event_t *self)
	273	{
	274	self->fork.pid = bswap_32(self->fork.pid);
	275	self->fork.tid = bswap_32(self->fork.tid);
	276	self->fork.ppid = bswap_32(self->fork.ppid);
	277	self->fork.ptid = bswap_32(self->fork.ptid);
	278	self->fork.time = bswap_64(self->fork.time);
	279	}
	280
	281	static void event__read_swap(event_t *self)
	282	{
	283	self->read.pid = bswap_32(self->read.pid);
	284	self->read.tid = bswap_32(self->read.tid);
	285	self->read.value = bswap_64(self->read.value);
	286	self->read.time_enabled = bswap_64(self->read.time_enabled);
	287	self->read.time_running = bswap_64(self->read.time_running);
	288	self->read.id = bswap_64(self->read.id);
	289	}
	290
2c46dbb5 TZ	291	static void event__attr_swap(event_t *self)
	292	{
	293	size_t size;
	294
	295	self->attr.attr.type = bswap_32(self->attr.attr.type);
	296	self->attr.attr.size = bswap_32(self->attr.attr.size);
	297	self->attr.attr.config = bswap_64(self->attr.attr.config);
	298	self->attr.attr.sample_period = bswap_64(self->attr.attr.sample_period);
	299	self->attr.attr.sample_type = bswap_64(self->attr.attr.sample_type);
	300	self->attr.attr.read_format = bswap_64(self->attr.attr.read_format);
	301	self->attr.attr.wakeup_events = bswap_32(self->attr.attr.wakeup_events);
	302	self->attr.attr.bp_type = bswap_32(self->attr.attr.bp_type);
	303	self->attr.attr.bp_addr = bswap_64(self->attr.attr.bp_addr);
	304	self->attr.attr.bp_len = bswap_64(self->attr.attr.bp_len);
	305
	306	size = self->header.size;
	307	size -= (void )&self->attr.id - (void )self;
	308	mem_bswap_64(self->attr.id, size);
	309	}
	310
cd19a035 TZ	311	static void event__event_type_swap(event_t *self)
	312	{
	313	self->event_type.event_type.event_id =
	314	bswap_64(self->event_type.event_type.event_id);
	315	}
	316
9215545e TZ	317	static void event__tracing_data_swap(event_t *self)
	318	{
	319	self->tracing_data.size = bswap_32(self->tracing_data.size);
	320	}
	321
ba21594c ACM	322	typedef void (event__swap_op)(event_t self);
	323
	324	static event__swap_op event__swap_ops[] = {
	325	[PERF_RECORD_MMAP] = event__mmap_swap,
	326	[PERF_RECORD_COMM] = event__comm_swap,
	327	[PERF_RECORD_FORK] = event__task_swap,
	328	[PERF_RECORD_EXIT] = event__task_swap,
	329	[PERF_RECORD_LOST] = event__all64_swap,
	330	[PERF_RECORD_READ] = event__read_swap,
	331	[PERF_RECORD_SAMPLE] = event__all64_swap,
2c46dbb5	332	[PERF_RECORD_HEADER_ATTR] = event__attr_swap,
cd19a035	333	[PERF_RECORD_HEADER_EVENT_TYPE] = event__event_type_swap,
9215545e	334	[PERF_RECORD_HEADER_TRACING_DATA] = event__tracing_data_swap,
8dc58101	335	[PERF_RECORD_HEADER_MAX] = NULL,
ba21594c ACM	336	};
ba21594c ACM	337
06aae590 ACM	338	static int perf_session__process_event(struct perf_session *self,
	339	event_t *event,
	340	struct perf_event_ops *ops,
ba21594c	341	u64 offset, u64 head)
06aae590 ACM	342	{
	343	trace_event(event);
	344
8dc58101	345	if (event->header.type < PERF_RECORD_HEADER_MAX) {
ba21594c	346	dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
0d755034	347	offset + head, event->header.size,
06aae590 ACM	348	event__name[event->header.type]);
	349	++event__total[0];
	350	++event__total[event->header.type];
	351	}
	352
ba21594c ACM	353	if (self->header.needs_swap && event__swap_ops[event->header.type])
	354	event__swap_ops[event->header.type](event);
	355
06aae590 ACM	356	switch (event->header.type) {
06aae590 ACM	357	case PERF_RECORD_SAMPLE:
55aa640f	358	return ops->sample(event, self);
06aae590	359	case PERF_RECORD_MMAP:
55aa640f	360	return ops->mmap(event, self);
06aae590	361	case PERF_RECORD_COMM:
55aa640f	362	return ops->comm(event, self);
06aae590	363	case PERF_RECORD_FORK:
55aa640f	364	return ops->fork(event, self);
06aae590	365	case PERF_RECORD_EXIT:
55aa640f	366	return ops->exit(event, self);
06aae590	367	case PERF_RECORD_LOST:
55aa640f	368	return ops->lost(event, self);
06aae590	369	case PERF_RECORD_READ:
55aa640f	370	return ops->read(event, self);
06aae590	371	case PERF_RECORD_THROTTLE:
55aa640f	372	return ops->throttle(event, self);
06aae590	373	case PERF_RECORD_UNTHROTTLE:
55aa640f	374	return ops->unthrottle(event, self);
2c46dbb5 TZ	375	case PERF_RECORD_HEADER_ATTR:
2c46dbb5 TZ	376	return ops->attr(event, self);
cd19a035 TZ	377	case PERF_RECORD_HEADER_EVENT_TYPE:
cd19a035 TZ	378	return ops->event_type(event, self);
9215545e TZ	379	case PERF_RECORD_HEADER_TRACING_DATA:
	380	/* setup for reading amidst mmap */
	381	lseek(self->fd, offset + head, SEEK_SET);
	382	return ops->tracing_data(event, self);
06aae590	383	default:
31d337c4	384	self->unknown_events++;
06aae590 ACM	385	return -1;
	386	}
	387	}
	388
ba21594c ACM	389	void perf_event_header__bswap(struct perf_event_header *self)
	390	{
	391	self->type = bswap_32(self->type);
	392	self->misc = bswap_16(self->misc);
	393	self->size = bswap_16(self->size);
	394	}
	395
	396	int perf_header__read_build_ids(struct perf_header *self,
	397	int input, u64 offset, u64 size)
06aae590 ACM	398	{
	399	struct build_id_event bev;
	400	char filename[PATH_MAX];
	401	u64 limit = offset + size;
	402	int err = -1;
	403
	404	while (offset < limit) {
	405	struct dso *dso;
	406	ssize_t len;
a89e5abe	407	struct list_head *head = &dsos__user;
06aae590 ACM	408
	409	if (read(input, &bev, sizeof(bev)) != sizeof(bev))
	410	goto out;
	411
ba21594c ACM	412	if (self->needs_swap)
	413	perf_event_header__bswap(&bev.header);
	414
06aae590 ACM	415	len = bev.header.size - sizeof(bev);
	416	if (read(input, filename, len) != len)
	417	goto out;
	418
a89e5abe ACM	419	if (bev.header.misc & PERF_RECORD_MISC_KERNEL)
	420	head = &dsos__kernel;
	421
	422	dso = __dsos__findnew(head, filename);
b7cece76	423	if (dso != NULL) {
06aae590	424	dso__set_build_id(dso, &bev.build_id);
b7cece76 ACM	425	if (head == &dsos__kernel && filename[0] == '[')
	426	dso->kernel = 1;
	427	}
06aae590 ACM	428
	429	offset += bev.header.size;
	430	}
	431	err = 0;
	432	out:
	433	return err;
	434	}
	435
	436	static struct thread perf_session__register_idle_thread(struct perf_session self)
	437	{
	438	struct thread *thread = perf_session__findnew(self, 0);
	439
	440	if (thread == NULL \|\| thread__set_comm(thread, "swapper")) {
	441	pr_err("problem inserting idle task.\n");
	442	thread = NULL;
	443	}
	444
	445	return thread;
	446	}
	447
8dc58101 TZ	448	int do_read(int fd, void *buf, size_t size)
	449	{
	450	void *buf_start = buf;
	451
	452	while (size) {
	453	int ret = read(fd, buf, size);
	454
	455	if (ret <= 0)
	456	return ret;
	457
	458	size -= ret;
	459	buf += ret;
	460	}
	461
	462	return buf - buf_start;
	463	}
	464
	465	#define session_done() ((volatile int )(&session_done))
	466	volatile int session_done;
	467
	468	static int __perf_session__process_pipe_events(struct perf_session *self,
	469	struct perf_event_ops *ops)
	470	{
	471	event_t event;
	472	uint32_t size;
	473	int skip = 0;
	474	u64 head;
	475	int err;
	476	void *p;
	477
	478	perf_event_ops__fill_defaults(ops);
	479
	480	head = 0;
	481	more:
	482	err = do_read(self->fd, &event, sizeof(struct perf_event_header));
	483	if (err <= 0) {
	484	if (err == 0)
	485	goto done;
	486
	487	pr_err("failed to read event header\n");
	488	goto out_err;
	489	}
	490
	491	if (self->header.needs_swap)
	492	perf_event_header__bswap(&event.header);
	493
	494	size = event.header.size;
	495	if (size == 0)
	496	size = 8;
	497
	498	p = &event;
	499	p += sizeof(struct perf_event_header);
	500
	501	err = do_read(self->fd, p, size - sizeof(struct perf_event_header));
	502	if (err <= 0) {
	503	if (err == 0) {
	504	pr_err("unexpected end of event stream\n");
	505	goto done;
	506	}
	507
	508	pr_err("failed to read event data\n");
	509	goto out_err;
	510	}
	511
512	if (size == 0 \|\|
513	(skip = perf_session__process_event(self, &event, ops,
514	0, head)) < 0) {
515	dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
516	head, event.header.size, event.header.type);
517	/*
518	* assume we lost track of the stream, check alignment, and
519	* increment a single u64 in the hope to catch on again 'soon'.
520	*/
521	if (unlikely(head & 7))
522	head &= ~7ULL;
523
524	size = 8;
525	}
526
527	head += size;
528
529	dump_printf("\n%#Lx [%#x]: event: %d\n",
530	head, event.header.size, event.header.type);
531
532	if (skip > 0)
533	head += skip;
534
535	if (!session_done())
536	goto more;
537	done:
538	err = 0;
539	out_err:
540	return err;
541	}
542
6122e4e4 ACM	543	int __perf_session__process_events(struct perf_session *self,
	544	u64 data_offset, u64 data_size,
	545	u64 file_size, struct perf_event_ops *ops)
06aae590	546	{
ba21594c ACM	547	int err, mmap_prot, mmap_flags;
	548	u64 head, shift;
	549	u64 offset = 0;
06aae590 ACM	550	size_t page_size;
	551	event_t *event;
	552	uint32_t size;
	553	char *buf;
5f4d3f88 ACM	554	struct ui_progress *progress = ui_progress__new("Processing events...",
	555	self->size);
	556	if (progress == NULL)
	557	return -1;
06aae590	558
06aae590 ACM	559	perf_event_ops__fill_defaults(ops);
06aae590 ACM	560
1b75962e	561	page_size = sysconf(_SC_PAGESIZE);
06aae590	562
6122e4e4	563	head = data_offset;
06aae590 ACM	564	shift = page_size * (head / page_size);
	565	offset += shift;
	566	head -= shift;
	567
ba21594c ACM	568	mmap_prot = PROT_READ;
	569	mmap_flags = MAP_SHARED;
	570
	571	if (self->header.needs_swap) {
	572	mmap_prot \|= PROT_WRITE;
	573	mmap_flags = MAP_PRIVATE;
	574	}
06aae590	575	remap:
ba21594c ACM	576	buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
ba21594c ACM	577	mmap_flags, self->fd, offset);
06aae590 ACM	578	if (buf == MAP_FAILED) {
	579	pr_err("failed to mmap file\n");
	580	err = -errno;
	581	goto out_err;
	582	}
	583
	584	more:
	585	event = (event_t *)(buf + head);
5f4d3f88	586	ui_progress__update(progress, offset);
06aae590	587
ba21594c ACM	588	if (self->header.needs_swap)
ba21594c ACM	589	perf_event_header__bswap(&event->header);
06aae590 ACM	590	size = event->header.size;
	591	if (size == 0)
	592	size = 8;
	593
	594	if (head + event->header.size >= page_size * self->mmap_window) {
	595	int munmap_ret;
	596
	597	shift = page_size * (head / page_size);
	598
	599	munmap_ret = munmap(buf, page_size * self->mmap_window);
	600	assert(munmap_ret == 0);
	601
	602	offset += shift;
	603	head -= shift;
	604	goto remap;
	605	}
	606
	607	size = event->header.size;
	608
ba21594c	609	dump_printf("\n%#Lx [%#x]: event: %d\n",
0d755034	610	offset + head, event->header.size, event->header.type);
06aae590 ACM	611
	612	if (size == 0 \|\|
	613	perf_session__process_event(self, event, ops, offset, head) < 0) {
ba21594c	614	dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
0d755034	615	offset + head, event->header.size,
06aae590 ACM	616	event->header.type);
	617	/*
	618	* assume we lost track of the stream, check alignment, and
	619	* increment a single u64 in the hope to catch on again 'soon'.
	620	*/
	621	if (unlikely(head & 7))
	622	head &= ~7ULL;
	623
	624	size = 8;
	625	}
	626
	627	head += size;
	628
6122e4e4	629	if (offset + head >= data_offset + data_size)
06aae590 ACM	630	goto done;
06aae590 ACM	631
6122e4e4	632	if (offset + head < file_size)
06aae590 ACM	633	goto more;
	634	done:
	635	err = 0;
	636	out_err:
5f4d3f88	637	ui_progress__delete(progress);
06aae590 ACM	638	return err;
06aae590 ACM	639	}
27295592	640
6122e4e4 ACM	641	int perf_session__process_events(struct perf_session *self,
	642	struct perf_event_ops *ops)
	643	{
	644	int err;
	645
	646	if (perf_session__register_idle_thread(self) == NULL)
	647	return -ENOMEM;
	648
	649	if (!symbol_conf.full_paths) {
	650	char bf[PATH_MAX];
	651
	652	if (getcwd(bf, sizeof(bf)) == NULL) {
	653	err = -errno;
	654	out_getcwd_err:
	655	pr_err("failed to get the current directory\n");
	656	goto out_err;
	657	}
	658	self->cwd = strdup(bf);
	659	if (self->cwd == NULL) {
	660	err = -ENOMEM;
	661	goto out_getcwd_err;
	662	}
	663	self->cwdlen = strlen(self->cwd);
	664	}
	665
8dc58101 TZ	666	if (!self->fd_pipe)
	667	err = __perf_session__process_events(self,
	668	self->header.data_offset,
	669	self->header.data_size,
	670	self->size, ops);
	671	else
	672	err = __perf_session__process_pipe_events(self, ops);
6122e4e4 ACM	673	out_err:
	674	return err;
	675	}
	676
d549c769	677	bool perf_session__has_traces(struct perf_session self, const char msg)
27295592 ACM	678	{
27295592 ACM	679	if (!(self->sample_type & PERF_SAMPLE_RAW)) {
d549c769 ACM	680	pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
d549c769 ACM	681	return false;
27295592 ACM	682	}
27295592 ACM	683
d549c769	684	return true;
27295592	685	}
56b03f3c ACM	686
	687	int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
	688	const char *symbol_name,
	689	u64 addr)
	690	{
	691	char *bracket;
9de89fe7	692	enum map_type i;
56b03f3c ACM	693
	694	self->ref_reloc_sym.name = strdup(symbol_name);
	695	if (self->ref_reloc_sym.name == NULL)
	696	return -ENOMEM;
	697
	698	bracket = strchr(self->ref_reloc_sym.name, ']');
	699	if (bracket)
	700	*bracket = '\0';
	701
	702	self->ref_reloc_sym.addr = addr;
9de89fe7 ACM	703
	704	for (i = 0; i < MAP__NR_TYPES; ++i) {
	705	struct kmap *kmap = map__kmap(self->vmlinux_maps[i]);
	706	kmap->ref_reloc_sym = &self->ref_reloc_sym;
	707	}
	708
56b03f3c ACM	709	return 0;
56b03f3c ACM	710	}