session.c

}

static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
					    struct perf_tool *tool, u64 file_offset)
{
	int err;

	dump_event(session, event, file_offset, NULL);

	/* These events are processed right away */
	switch (event->header.type) {
	case PERF_RECORD_HEADER_ATTR:
		err = tool->attr(tool, event, &session->evlist);
		if (err == 0)
			perf_session__set_id_hdr_size(session);
		return err;
	case PERF_RECORD_HEADER_TRACING_DATA:
		/* setup for reading amidst mmap */
		lseek(session->fd, file_offset, SEEK_SET);
		return tool->tracing_data(tool, event, session);
	case PERF_RECORD_HEADER_BUILD_ID:
		return tool->build_id(tool, event, session);
	case PERF_RECORD_FINISHED_ROUND:
		return tool->finished_round(tool, event, session);
	default:
		return -EINVAL;
	}
}

static void event_swap(union perf_event *event, bool sample_id_all)
{
	perf_event__swap_op swap;

	swap = perf_event__swap_ops[event->header.type];
	if (swap)
		swap(event, sample_id_all);
}

static int perf_session__process_event(struct perf_session *session,
				       union perf_event *event,
				       struct perf_tool *tool,
				       u64 file_offset)
{
	struct perf_sample sample;
	int ret;

	if (session->header.needs_swap)
		event_swap(event, perf_evlist__sample_id_all(session->evlist));

	if (event->header.type >= PERF_RECORD_HEADER_MAX)
		return -EINVAL;

	events_stats__inc(&session->stats, event->header.type);

	if (event->header.type >= PERF_RECORD_USER_TYPE_START)
		return perf_session__process_user_event(session, event, tool, file_offset);

	/*
	 * For all kernel events we get the sample data
	 */
	ret = perf_evlist__parse_sample(session->evlist, event, &sample);
	if (ret)
		return ret;

	if (tool->ordered_samples) {
		ret = perf_session_queue_event(session, event, &sample,
					       file_offset);
		if (ret != -ETIME)
			return ret;
	}

	return perf_session_deliver_event(session, event, &sample, tool,
					  file_offset);
}

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);
}

struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
{
	return machine__findnew_thread(&session->machines.host, 0, pid);
}

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;
}

static void perf_session__warn_about_errors(const struct perf_session *session,
					    const struct perf_tool *tool)
{
	if (tool->lost == perf_event__process_lost &&
	    session->stats.nr_events[PERF_RECORD_LOST] != 0) {
		ui__warning("Processed %d events and lost %d chunks!\n\n"
			    "Check IO/CPU overload!\n\n",
			    session->stats.nr_events[0],
			    session->stats.nr_events[PERF_RECORD_LOST]);
	}

	if (session->stats.nr_unknown_events != 0) {
		ui__warning("Found %u unknown events!\n\n"
			    "Is this an older tool processing a perf.data "
			    "file generated by a more recent tool?\n\n"
			    "If that is not the case, consider "
			    "reporting to linux-kernel@vger.kernel.org.\n\n",
			    session->stats.nr_unknown_events);
	}

	if (session->stats.nr_unknown_id != 0) {
		ui__warning("%u samples with id not present in the header\n",
			    session->stats.nr_unknown_id);
	}

 	if (session->stats.nr_invalid_chains != 0) {
 		ui__warning("Found invalid callchains!\n\n"
 			    "%u out of %u events were discarded for this reason.\n\n"
 			    "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
 			    session->stats.nr_invalid_chains,
 			    session->stats.nr_events[PERF_RECORD_SAMPLE]);
 	}

	if (session->stats.nr_unprocessable_samples != 0) {
		ui__warning("%u unprocessable samples recorded.\n"
			    "Do you have a KVM guest running and not using 'perf kvm'?\n",
			    session->stats.nr_unprocessable_samples);
	}
}

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

static int __perf_session__process_pipe_events(struct perf_session *self,
					       struct perf_tool *tool)
{
	union perf_event *event;
	uint32_t size, cur_size = 0;
	void *buf = NULL;
	int skip = 0;
	u64 head;
	int err;
	void *p;

	perf_tool__fill_defaults(tool);

	head = 0;
	cur_size = sizeof(union perf_event);

	buf = malloc(cur_size);
	if (!buf)
		return -errno;
more:
	event = buf;
	err = readn(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 < sizeof(struct perf_event_header)) {
		pr_err("bad event header size\n");
		goto out_err;
	}

	if (size > cur_size) {
		void *new = realloc(buf, size);
		if (!new) {
			pr_err("failed to allocate memory to read event\n");
			goto out_err;
		}
		buf = new;
		cur_size = size;
		event = buf;
	}
	p = event;
	p += sizeof(struct perf_event_header);

	if (size - sizeof(struct perf_event_header)) {
		err = readn(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 ((skip = perf_session__process_event(self, event, tool, head)) < 0) {
		pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
		       head, event->header.size, event->header.type);
		err = -EINVAL;
		goto out_err;
	}

	head += size;

	if (skip > 0)
		head += skip;

	if (!session_done())
		goto more;
done:
	err = 0;
out_err:
	free(buf);
	perf_session__warn_about_errors(self, tool);
	perf_session_free_sample_buffers(self);
	return err;
}

static union perf_event *
fetch_mmaped_event(struct perf_session *session,
		   u64 head, size_t mmap_size, char *buf)
{
	union perf_event *event;

	/*
	 * Ensure we have enough space remaining to read
	 * the size of the event in the headers.
	 */
	if (head + sizeof(event->header) > mmap_size)
		return NULL;

	event = (union perf_event *)(buf + head);

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

	if (head + event->header.size > mmap_size) {
		/* We're not fetching the event so swap back again */
		if (session->header.needs_swap)
			perf_event_header__bswap(&event->header);
		return NULL;
	}

	return event;
}

/*
 * On 64bit we can mmap the data file in one go. No need for tiny mmap
 * slices. On 32bit we use 32MB.
 */
#if BITS_PER_LONG == 64
#define MMAP_SIZE ULLONG_MAX
#define NUM_MMAPS 1
#else
#define MMAP_SIZE (32 * 1024 * 1024ULL)
#define NUM_MMAPS 128
#endif

int __perf_session__process_events(struct perf_session *session,
				   u64 data_offset, u64 data_size,
				   u64 file_size, struct perf_tool *tool)
{
	u64 head, page_offset, file_offset, file_pos, progress_next;
	int err, mmap_prot, mmap_flags, map_idx = 0;
	size_t	mmap_size;
	char *buf, *mmaps[NUM_MMAPS];
	union perf_event *event;
	uint32_t size;

	perf_tool__fill_defaults(tool);

	page_offset = page_size * (data_offset / page_size);
	file_offset = page_offset;
	head = data_offset - page_offset;

	if (data_offset + data_size < file_size)
		file_size = data_offset + data_size;

	progress_next = file_size / 16;

	mmap_size = MMAP_SIZE;
	if (mmap_size > file_size)
		mmap_size = file_size;

	memset(mmaps, 0, sizeof(mmaps));

	mmap_prot  = PROT_READ;
	mmap_flags = MAP_SHARED;

	if (session->header.needs_swap) {
		mmap_prot  |= PROT_WRITE;
		mmap_flags = MAP_PRIVATE;
	}
remap:
	buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
		   file_offset);
	if (buf == MAP_FAILED) {
		pr_err("failed to mmap file\n");
		err = -errno;
		goto out_err;
	}
	mmaps[map_idx] = buf;
	map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
	file_pos = file_offset + head;

more:
	event = fetch_mmaped_event(session, head, mmap_size, buf);
	if (!event) {
		if (mmaps[map_idx]) {
			munmap(mmaps[map_idx], mmap_size);
			mmaps[map_idx] = NULL;
		}

		page_offset = page_size * (head / page_size);
		file_offset += page_offset;
		head -= page_offset;
		goto remap;
	}

	size = event->header.size;

	if (size < sizeof(struct perf_event_header) ||
	    perf_session__process_event(session, event, tool, file_pos) < 0) {
		pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
		       file_offset + head, event->header.size,
		       event->header.type);
		err = -EINVAL;
		goto out_err;
	}

	head += size;
	file_pos += size;

	if (file_pos >= progress_next) {
		progress_next += file_size / 16;
		ui_progress__update(file_pos, file_size,
				    "Processing events...");
	}

	if (file_pos < file_size)
		goto more;

	err = 0;
	/* do the final flush for ordered samples */
	session->ordered_samples.next_flush = ULLONG_MAX;
	err = flush_sample_queue(session, tool);
out_err:
	ui_progress__finish();
	perf_session__warn_about_errors(session, tool);
	perf_session_free_sample_buffers(session);
	return err;
}

int perf_session__process_events(struct perf_session *self,
				 struct perf_tool *tool)
{
	int err;

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

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

	return err;
}

bool perf_session__has_traces(struct perf_session *session, const char *msg)
{
	struct perf_evsel *evsel;

	list_for_each_entry(evsel, &session->evlist->entries, node) {
		if (evsel->attr.type == PERF_TYPE_TRACEPOINT)
			return true;
	}

	pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
	return false;
}

int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
				     const char *symbol_name, u64 addr)
{
	char *bracket;
	enum map_type i;
	struct ref_reloc_sym *ref;

	ref = zalloc(sizeof(struct ref_reloc_sym));
	if (ref == NULL)
		return -ENOMEM;

	ref->name = strdup(symbol_name);
	if (ref->name == NULL) {
		free(ref);
		return -ENOMEM;
	}

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

	ref->addr = addr;

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

	return 0;
}

size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
{
	return machines__fprintf_dsos(&self->machines, fp);
}

size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
					  bool (skip)(struct dso *dso, int parm), int parm)
{
	return machines__fprintf_dsos_buildid(&self->machines, fp, skip, parm);
}

size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
{
	struct perf_evsel *pos;
	size_t ret = fprintf(fp, "Aggregated stats:\n");

	ret += events_stats__fprintf(&session->stats, fp);

	list_for_each_entry(pos, &session->evlist->entries, node) {
		ret += fprintf(fp, "%s stats:\n", perf_evsel__name(pos));
		ret += events_stats__fprintf(&pos->hists.stats, fp);
	}

	return ret;
}

size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
{
	/*
	 * FIXME: Here we have to actually print all the machines in this
	 * session, not just the host...
	 */
	return machine__fprintf(&session->machines.host, fp);
}

struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
					      unsigned int type)
{
	struct perf_evsel *pos;

	list_for_each_entry(pos, &session->evlist->entries, node) {
		if (pos->attr.type == type)
			return pos;
	}
	return NULL;
}

void perf_evsel__print_ip(struct perf_evsel *evsel, union perf_event *event,
			  struct perf_sample *sample, struct machine *machine,
			  unsigned int print_opts, unsigned int stack_depth)
{
	struct addr_location al;
	struct callchain_cursor_node *node;
	int print_ip = print_opts & PRINT_IP_OPT_IP;
	int print_sym = print_opts & PRINT_IP_OPT_SYM;
	int print_dso = print_opts & PRINT_IP_OPT_DSO;
	int print_symoffset = print_opts & PRINT_IP_OPT_SYMOFFSET;
	int print_oneline = print_opts & PRINT_IP_OPT_ONELINE;
	char s = print_oneline ? ' ' : '\t';

	if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
		error("problem processing %d event, skipping it.\n",
			event->header.type);
		return;
	}

	if (symbol_conf.use_callchain && sample->callchain) {

		if (machine__resolve_callchain(machine, evsel, al.thread,
					       sample, NULL, NULL) != 0) {
			if (verbose)
				error("Failed to resolve callchain. Skipping\n");
			return;
		}
		callchain_cursor_commit(&callchain_cursor);

		while (stack_depth) {
			node = callchain_cursor_current(&callchain_cursor);
			if (!node)
				break;

			if (print_ip)
				printf("%c%16" PRIx64, s, node->ip);

			if (print_sym) {
				printf(" ");
				if (print_symoffset) {
					al.addr = node->ip;
					al.map  = node->map;
					symbol__fprintf_symname_offs(node->sym, &al, stdout);
				} else
					symbol__fprintf_symname(node->sym, stdout);
			}

			if (print_dso) {
				printf(" (");
				map__fprintf_dsoname(node->map, stdout);
				printf(")");
			}

			if (!print_oneline)
				printf("\n");

			callchain_cursor_advance(&callchain_cursor);

			stack_depth--;
		}

	} else {
		if (print_ip)
			printf("%16" PRIx64, sample->ip);

		if (print_sym) {
			printf(" ");
			if (print_symoffset)
				symbol__fprintf_symname_offs(al.sym, &al,
							     stdout);
			else
				symbol__fprintf_symname(al.sym, stdout);
		}

		if (print_dso) {
			printf(" (");
			map__fprintf_dsoname(al.map, stdout);
			printf(")");
		}
	}
}

int perf_session__cpu_bitmap(struct perf_session *session,
			     const char *cpu_list, unsigned long *cpu_bitmap)
{
	int i;
	struct cpu_map *map;

	for (i = 0; i < PERF_TYPE_MAX; ++i) {
		struct perf_evsel *evsel;

		evsel = perf_session__find_first_evtype(session, i);
		if (!evsel)
			continue;

		if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
			pr_err("File does not contain CPU events. "
			       "Remove -c option to proceed.\n");
			return -1;
		}
	}

	map = cpu_map__new(cpu_list);
	if (map == NULL) {
		pr_err("Invalid cpu_list\n");
		return -1;
	}

	for (i = 0; i < map->nr; i++) {
		int cpu = map->map[i];

		if (cpu >= MAX_NR_CPUS) {
			pr_err("Requested CPU %d too large. "
			       "Consider raising MAX_NR_CPUS\n", cpu);
			return -1;
		}

		set_bit(cpu, cpu_bitmap);
	}

	return 0;
}

void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
				bool full)
{
	struct stat st;
	int ret;

	if (session == NULL || fp == NULL)
		return;

	ret = fstat(session->fd, &st);
	if (ret == -1)
		return;

	fprintf(fp, "# ========\n");
	fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
	perf_header__fprintf_info(session, fp, full);
	fprintf(fp, "# ========\n#\n");
}


int __perf_session__set_tracepoints_handlers(struct perf_session *session,
					     const struct perf_evsel_str_handler *assocs,
					     size_t nr_assocs)
{
	struct perf_evsel *evsel;
	size_t i;
	int err;

	for (i = 0; i < nr_assocs; i++) {
		/*
		 * Adding a handler for an event not in the session,
		 * just ignore it.
		 */
		evsel = perf_evlist__find_tracepoint_by_name(session->evlist, assocs[i].name);
		if (evsel == NULL)
			continue;

		err = -EEXIST;
		if (evsel->handler.func != NULL)
			goto out;
		evsel->handler.func = assocs[i].handler;
	}

	err = 0;
out:
	return err;
}