text: // SPDX-License-Identifier: GPL-2.0
  #include <errno.h>
  #include <inttypes.h>
  #include <linux/err.h>
  #include <linux/kernel.h>
  #include <linux/zalloc.h>
  #include <api/fs/fs.h>
  
  #include <byteswap.h>
  #include <unistd.h>
  #include <sys/types.h>
  #include <sys/mman.h>
  #include <perf/cpumap.h>
  
  #include "map_symbol.h"
  #include "branch.h"
  #include "debug.h"
  #include "evlist.h"
  #include "evsel.h"
  #include "memswap.h"
  #include "map.h"
  #include "symbol.h"
  #include "session.h"
  #include "tool.h"
  #include "perf_regs.h"
  #include "asm/bug.h"
  #include "auxtrace.h"
  #include "thread.h"
  #include "thread-stack.h"
  #include "sample-raw.h"
  #include "stat.h"
  #include "ui/progress.h"
  #include "../perf.h"
  #include "arch/common.h"
  #include <internal/lib.h>
  #include <linux/err.h>
  
  #ifdef HAVE_ZSTD_SUPPORT
  static int perf_session__process_compressed_event(struct perf_session *session,
  						  union perf_event *event, u64 file_offset)
  {
  	void *src;
  	size_t decomp_size, src_size;
  	u64 decomp_last_rem = 0;
  	size_t mmap_len, decomp_len = session->header.env.comp_mmap_len;
  	struct decomp *decomp, *decomp_last = session->decomp_last;
  
  	if (decomp_last) {
  		decomp_last_rem = decomp_last->size - decomp_last->head;
  		decomp_len += decomp_last_rem;
  	}
  
  	mmap_len = sizeof(struct decomp) + decomp_len;
  	decomp = mmap(NULL, mmap_len, PROT_READ|PROT_WRITE,
  		      MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
  	if (decomp == MAP_FAILED) {
  		pr_err("Couldn't allocate memory for decompression\n");
  		return -1;
  	}
  
  	decomp->file_pos = file_offset;
  	decomp->mmap_len = mmap_len;
  	decomp->head = 0;
  
  	if (decomp_last_rem) {
  		memcpy(decomp->data, &(decomp_last->data[decomp_last->head]), decomp_last_rem);
  		decomp->size = decomp_last_rem;
  	}
  
  	src = (void *)event + sizeof(struct perf_record_compressed);
  	src_size = event->pack.header.size - sizeof(struct perf_record_compressed);
  
  	decomp_size = zstd_decompress_stream(&(session->zstd_data), src, src_size,
  				&(decomp->data[decomp_last_rem]), decomp_len - decomp_last_rem);
  	if (!decomp_size) {
  		munmap(decomp, mmap_len);
  		pr_err("Couldn't decompress data\n");
  		return -1;
  	}
  
  	decomp->size += decomp_size;
  
  	if (session->decomp == NULL) {
  		session->decomp = decomp;
  		session->decomp_last = decomp;
  	} else {
  		session->decomp_last->next = decomp;
  		session->decomp_last = decomp;
  	}
  
  	pr_debug("decomp (B): %ld to %ld\n", src_size, decomp_size);
  
  	return 0;
  }
  #else /* !HAVE_ZSTD_SUPPORT */
  #define perf_session__process_compressed_event perf_session__process_compressed_event_stub
  #endif
  
  static int perf_session__deliver_event(struct perf_session *session,
  				       union perf_event *event,
  				       struct perf_tool *tool,
  				       u64 file_offset);
  
  static int perf_session__open(struct perf_session *session)
  {
  	struct perf_data *data = session->data;
  
  	if (perf_session__read_header(session) < 0) {
  		pr_err("incompatible file format (rerun with -v to learn more)\n");
  		return -1;
  	}
  
  	if (perf_data__is_pipe(data))
  		return 0;
  
  	if (perf_header__has_feat(&session->header, HEADER_STAT))
  		return 0;
  
  	if (!perf_evlist__valid_sample_type(session->evlist)) {
  		pr_err("non matching sample_type\n");
  		return -1;
  	}
  
  	if (!perf_evlist__valid_sample_id_all(session->evlist)) {
  		pr_err("non matching sample_id_all\n");
  		return -1;
  	}
  
  	if (!perf_evlist__valid_read_format(session->evlist)) {
  		pr_err("non matching read_format\n");
  		return -1;
  	}
  
  	return 0;
  }
  
  void perf_session__set_id_hdr_size(struct perf_session *session)
  {
  	u16 id_hdr_size = perf_evlist__id_hdr_size(session->evlist);
  
  	machines__set_id_hdr_size(&session->machines, id_hdr_size);
  }
  
  int perf_session__create_kernel_maps(struct perf_session *session)
  {
  	int ret = machine__create_kernel_maps(&session->machines.host);
  
  	if (ret >= 0)
  		ret = machines__create_guest_kernel_maps(&session->machines);
  	return ret;
  }
  
  static void perf_session__destroy_kernel_maps(struct perf_session *session)
  {
  	machines__destroy_kernel_maps(&session->machines);
  }
  
  static bool perf_session__has_comm_exec(struct perf_session *session)
  {
  	struct evsel *evsel;
  
  	evlist__for_each_entry(session->evlist, evsel) {
  		if (evsel->core.attr.comm_exec)
  			return true;
  	}
  
  	return false;
  }
  
  static void perf_session__set_comm_exec(struct perf_session *session)
  {
  	bool comm_exec = perf_session__has_comm_exec(session);
  
  	machines__set_comm_exec(&session->machines, comm_exec);
  }
  
  static int ordered_events__deliver_event(struct ordered_events *oe,
  					 struct ordered_event *event)
  {
  	struct perf_session *session = container_of(oe, struct perf_session,
  						    ordered_events);
  
  	return perf_session__deliver_event(session, event->event,
  					   session->tool, event->file_offset);
  }
  
  struct perf_session *perf_session__new(struct perf_data *data,
  				       bool repipe, struct perf_tool *tool)
  {
  	int ret = -ENOMEM;
  	struct perf_session *session = zalloc(sizeof(*session));
  
  	if (!session)
  		goto out;
  
  	session->repipe = repipe;
  	session->tool   = tool;
  	INIT_LIST_HEAD(&session->auxtrace_index);
  	machines__init(&session->machines);
  	ordered_events__init(&session->ordered_events,
  			     ordered_events__deliver_event, NULL);
  
  	perf_env__init(&session->header.env);
  	if (data) {
  		ret = perf_data__open(data);
  		if (ret < 0)
  			goto out_delete;
  
  		session->data = data;
  
  		if (perf_data__is_read(data)) {
  			ret = perf_session__open(session);
  			if (ret < 0)
  				goto out_delete;
  
  			/*
  			 * set session attributes that are present in perf.data
  			 * but not in pipe-mode.
  			 */
  			if (!data->is_pipe) {
  				perf_session__set_id_hdr_size(session);
  				perf_session__set_comm_exec(session);
  			}
  
  			perf_evlist__init_trace_event_sample_raw(session->evlist);
  
  			/* Open the directory data. */
  			if (data->is_dir) {
  				ret = perf_data__open_dir(data);
  			if (ret)
  				goto out_delete;
  			}
  		}
  	} else  {
  		session->machines.host.env = &perf_env;
  	}
  
  	session->machines.host.single_address_space =
  		perf_env__single_address_space(session->machines.host.env);
  
  	if (!data || perf_data__is_write(data)) {
  		/*
  		 * In O_RDONLY mode this will be performed when reading the
  		 * kernel MMAP event, in perf_event__process_mmap().
  		 */
  		if (perf_session__create_kernel_maps(session) < 0)
  			pr_warning("Cannot read kernel map\n");
  	}
  
  	/*
  	 * In pipe-mode, evlist is empty until PERF_RECORD_HEADER_ATTR is
  	 * processed, so perf_evlist__sample_id_all is not meaningful here.
  	 */
  	if ((!data || !data->is_pipe) && tool && tool->ordering_requires_timestamps &&
  	    tool->ordered_events && !perf_evlist__sample_id_all(session->evlist)) {
  		dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
  		tool->ordered_events = false;
  	}
  
  	return session;
  
   out_delete:
  	perf_session__delete(session);
   out:
  	return ERR_PTR(ret);
  }
  
  static void perf_session__delete_threads(struct perf_session *session)
  {
  	machine__delete_threads(&session->machines.host);
  }
  
  static void perf_session__release_decomp_events(struct perf_session *session)
  {
  	struct decomp *next, *decomp;
  	size_t mmap_len;
  	next = session->decomp;
  	do {
  		decomp = next;
  		if (decomp == NULL)
  			break;
  		next = decomp->next;
  		mmap_len = decomp->mmap_len;
  		munmap(decomp, mmap_len);
  	} while (1);
  }
  
  void perf_session__delete(struct perf_session *session)
  {
  	if (session == NULL)
  		return;
  	auxtrace__free(session);
  	auxtrace_index__free(&session->auxtrace_index);
  	perf_session__destroy_kernel_maps(session);
  	perf_session__delete_threads(session);
  	perf_session__release_decomp_events(session);
  	perf_env__exit(&session->header.env);
  	machines__exit(&session->machines);
  	if (session->data)
  		perf_data__close(session->data);
  	free(session);
  }
  
  static int process_event_synth_tracing_data_stub(struct perf_session *session
  						 __maybe_unused,
  						 union perf_event *event
  						 __maybe_unused)
  {
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int process_event_synth_attr_stub(struct perf_tool *tool __maybe_unused,
  					 union perf_event *event __maybe_unused,
  					 struct evlist **pevlist
  					 __maybe_unused)
  {
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int process_event_synth_event_update_stub(struct perf_tool *tool __maybe_unused,
  						 union perf_event *event __maybe_unused,
  						 struct evlist **pevlist
  						 __maybe_unused)
  {
  	if (dump_trace)
  		perf_event__fprintf_event_update(event, stdout);
  
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int process_event_sample_stub(struct perf_tool *tool __maybe_unused,
  				     union perf_event *event __maybe_unused,
  				     struct perf_sample *sample __maybe_unused,
  				     struct evsel *evsel __maybe_unused,
  				     struct machine *machine __maybe_unused)
  {
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int process_event_stub(struct perf_tool *tool __maybe_unused,
  			      union perf_event *event __maybe_unused,
  			      struct perf_sample *sample __maybe_unused,
  			      struct machine *machine __maybe_unused)
  {
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int process_finished_round_stub(struct perf_tool *tool __maybe_unused,
  				       union perf_event *event __maybe_unused,
  				       struct ordered_events *oe __maybe_unused)
  {
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int process_finished_round(struct perf_tool *tool,
  				  union perf_event *event,
  				  struct ordered_events *oe);
  
  static int skipn(int fd, off_t n)
  {
  	char buf[4096];
  	ssize_t ret;
  
  	while (n > 0) {
  		ret = read(fd, buf, min(n, (off_t)sizeof(buf)));
  		if (ret <= 0)
  			return ret;
  		n -= ret;
  	}
  
  	return 0;
  }
  
  static s64 process_event_auxtrace_stub(struct perf_session *session __maybe_unused,
  				       union perf_event *event)
  {
  	dump_printf(": unhandled!\n");
  	if (perf_data__is_pipe(session->data))
  		skipn(perf_data__fd(session->data), event->auxtrace.size);
  	return event->auxtrace.size;
  }
  
  static int process_event_op2_stub(struct perf_session *session __maybe_unused,
  				  union perf_event *event __maybe_unused)
  {
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  
  static
  int process_event_thread_map_stub(struct perf_session *session __maybe_unused,
  				  union perf_event *event __maybe_unused)
  {
  	if (dump_trace)
  		perf_event__fprintf_thread_map(event, stdout);
  
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static
  int process_event_cpu_map_stub(struct perf_session *session __maybe_unused,
  			       union perf_event *event __maybe_unused)
  {
  	if (dump_trace)
  		perf_event__fprintf_cpu_map(event, stdout);
  
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static
  int process_event_stat_config_stub(struct perf_session *session __maybe_unused,
  				   union perf_event *event __maybe_unused)
  {
  	if (dump_trace)
  		perf_event__fprintf_stat_config(event, stdout);
  
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int process_stat_stub(struct perf_session *perf_session __maybe_unused,
  			     union perf_event *event)
  {
  	if (dump_trace)
  		perf_event__fprintf_stat(event, stdout);
  
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int process_stat_round_stub(struct perf_session *perf_session __maybe_unused,
  				   union perf_event *event)
  {
  	if (dump_trace)
  		perf_event__fprintf_stat_round(event, stdout);
  
  	dump_printf(": unhandled!\n");
  	return 0;
  }
  
  static int perf_session__process_compressed_event_stub(struct perf_session *session __maybe_unused,
  						       union perf_event *event __maybe_unused,
  						       u64 file_offset __maybe_unused)
  {
         dump_printf(": unhandled!\n");
         return 0;
  }
  
  void perf_tool__fill_defaults(struct perf_tool *tool)
  {
  	if (tool->sample == NULL)
  		tool->sample = process_event_sample_stub;
  	if (tool->mmap == NULL)
  		tool->mmap = process_event_stub;
  	if (tool->mmap2 == NULL)
  		tool->mmap2 = process_event_stub;
  	if (tool->comm == NULL)
  		tool->comm = process_event_stub;
  	if (tool->namespaces == NULL)
  		tool->namespaces = process_event_stub;
  	if (tool->fork == NULL)
  		tool->fork = process_event_stub;
  	if (tool->exit == NULL)
  		tool->exit = process_event_stub;
  	if (tool->lost == NULL)
  		tool->lost = perf_event__process_lost;
  	if (tool->lost_samples == NULL)
  		tool->lost_samples = perf_event__process_lost_samples;
  	if (tool->aux == NULL)
  		tool->aux = perf_event__process_aux;
  	if (tool->itrace_start == NULL)
  		tool->itrace_start = perf_event__process_itrace_start;
  	if (tool->context_switch == NULL)
  		tool->context_switch = perf_event__process_switch;
  	if (tool->ksymbol == NULL)
  		tool->ksymbol = perf_event__process_ksymbol;
  	if (tool->bpf == NULL)
  		tool->bpf = perf_event__process_bpf;
  	if (tool->read == NULL)
  		tool->read = process_event_sample_stub;
  	if (tool->throttle == NULL)
  		tool->throttle = process_event_stub;
  	if (tool->unthrottle == NULL)
  		tool->unthrottle = process_event_stub;
  	if (tool->attr == NULL)
  		tool->attr = process_event_synth_attr_stub;
  	if (tool->event_update == NULL)
  		tool->event_update = process_event_synth_event_update_stub;
  	if (tool->tracing_data == NULL)
  		tool->tracing_data = process_event_synth_tracing_data_stub;
  	if (tool->build_id == NULL)
  		tool->build_id = process_event_op2_stub;
  	if (tool->finished_round == NULL) {
  		if (tool->ordered_events)
  			tool->finished_round = process_finished_round;
  		else
  			tool->finished_round = process_finished_round_stub;
  	}
  	if (tool->id_index == NULL)
  		tool->id_index = process_event_op2_stub;
  	if (tool->auxtrace_info == NULL)
  		tool->auxtrace_info = process_event_op2_stub;
  	if (tool->auxtrace == NULL)
  		tool->auxtrace = process_event_auxtrace_stub;
  	if (tool->auxtrace_error == NULL)
  		tool->auxtrace_error = process_event_op2_stub;
  	if (tool->thread_map == NULL)
  		tool->thread_map = process_event_thread_map_stub;
  	if (tool->cpu_map == NULL)
  		tool->cpu_map = process_event_cpu_map_stub;
  	if (tool->stat_config == NULL)
  		tool->stat_config = process_event_stat_config_stub;
  	if (tool->stat == NULL)
  		tool->stat = process_stat_stub;
  	if (tool->stat_round == NULL)
  		tool->stat_round = process_stat_round_stub;
  	if (tool->time_conv == NULL)
  		tool->time_conv = process_event_op2_stub;
  	if (tool->feature == NULL)
  		tool->feature = process_event_op2_stub;
  	if (tool->compressed == NULL)
  		tool->compressed = perf_session__process_compressed_event;
  }
  
  static void swap_sample_id_all(union perf_event *event, void *data)
  {
  	void *end = (void *) event + event->header.size;
  	int size = end - data;
  
  	BUG_ON(size % sizeof(u64));
  	mem_bswap_64(data, size);
  }
  
  static void perf_event__all64_swap(union perf_event *event,
  				   bool sample_id_all __maybe_unused)
  {
  	struct perf_event_header *hdr = &event->header;
  	mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
  }
  
  static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
  {
  	event->comm.pid = bswap_32(event->comm.pid);
  	event->comm.tid = bswap_32(event->comm.tid);
  
  	if (sample_id_all) {
  		void *data = &event->comm.comm;
  
  		data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
  		swap_sample_id_all(event, data);
  	}
  }
  
  static void perf_event__mmap_swap(union perf_event *event,
  				  bool sample_id_all)
  {
  	event->mmap.pid	  = bswap_32(event->mmap.pid);
  	event->mmap.tid	  = bswap_32(event->mmap.tid);
  	event->mmap.start = bswap_64(event->mmap.start);
  	event->mmap.len	  = bswap_64(event->mmap.len);
  	event->mmap.pgoff = bswap_64(event->mmap.pgoff);
  
  	if (sample_id_all) {
  		void *data = &event->mmap.filename;
  
  		data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
  		swap_sample_id_all(event, data);
  	}
  }
  
  static void perf_event__mmap2_swap(union perf_event *event,
  				  bool sample_id_all)
  {
  	event->mmap2.pid   = bswap_32(event->mmap2.pid);
  	event->mmap2.tid   = bswap_32(event->mmap2.tid);
  	event->mmap2.start = bswap_64(event->mmap2.start);
  	event->mmap2.len   = bswap_64(event->mmap2.len);
  	event->mmap2.pgoff = bswap_64(event->mmap2.pgoff);
  	event->mmap2.maj   = bswap_32(event->mmap2.maj);
  	event->mmap2.min   = bswap_32(event->mmap2.min);
  	event->mmap2.ino   = bswap_64(event->mmap2.ino);
  
  	if (sample_id_all) {
  		void *data = &event->mmap2.filename;
  
  		data += PERF_ALIGN(strlen(data) + 1, sizeof(u64));
  		swap_sample_id_all(event, data);
  	}
  }
  static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
  {
  	event->fork.pid	 = bswap_32(event->fork.pid);
  	event->fork.tid	 = bswap_32(event->fork.tid);
  	event->fork.ppid = bswap_32(event->fork.ppid);
  	event->fork.ptid = bswap_32(event->fork.ptid);
  	event->fork.time = bswap_64(event->fork.time);
  
  	if (sample_id_all)
  		swap_sample_id_all(event, &event->fork + 1);
  }
  
  static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
  {
  	event->read.pid		 = bswap_32(event->read.pid);
  	event->read.tid		 = bswap_32(event->read.tid);
  	event->read.value	 = bswap_64(event->read.value);
  	event->read.time_enabled = bswap_64(event->read.time_enabled);
  	event->read.time_running = bswap_64(event->read.time_running);
  	event->read.id		 = bswap_64(event->read.id);
  
  	if (sample_id_all)
  		swap_sample_id_all(event, &event->read + 1);
  }
  
  static void perf_event__aux_swap(union perf_event *event, bool sample_id_all)
  {
  	event->aux.aux_offset = bswap_64(event->aux.aux_offset);
  	event->aux.aux_size   = bswap_64(event->aux.aux_size);
  	event->aux.flags      = bswap_64(event->aux.flags);
  
  	if (sample_id_all)
  		swap_sample_id_all(event, &event->aux + 1);
  }
  
  static void perf_event__itrace_start_swap(union perf_event *event,
  					  bool sample_id_all)
  {
  	event->itrace_start.pid	 = bswap_32(event->itrace_start.pid);
  	event->itrace_start.tid	 = bswap_32(event->itrace_start.tid);
  
  	if (sample_id_all)
  		swap_sample_id_all(event, &event->itrace_start + 1);
  }
  
  static void perf_event__switch_swap(union perf_event *event, bool sample_id_all)
  {
  	if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) {
  		event->context_switch.next_prev_pid =
  				bswap_32(event->context_switch.next_prev_pid);
  		event->context_switch.next_prev_tid =
  				bswap_32(event->context_switch.next_prev_tid);
  	}
  
  	if (sample_id_all)
  		swap_sample_id_all(event, &event->context_switch + 1);
  }
  
  static void perf_event__throttle_swap(union perf_event *event,
  				      bool sample_id_all)
  {
  	event->throttle.time	  = bswap_64(event->throttle.time);
  	event->throttle.id	  = bswap_64(event->throttle.id);
  	event->throttle.stream_id = bswap_64(event->throttle.stream_id);
  
  	if (sample_id_all)
  		swap_sample_id_all(event, &event->throttle + 1);
  }
  
  static void perf_event__namespaces_swap(union perf_event *event,
  					bool sample_id_all)
  {
  	u64 i;
  
  	event->namespaces.pid		= bswap_32(event->namespaces.pid);
  	event->namespaces.tid		= bswap_32(event->namespaces.tid);
  	event->namespaces.nr_namespaces	= bswap_64(event->namespaces.nr_namespaces);
  
  	for (i = 0; i < event->namespaces.nr_namespaces; i++) {
  		struct perf_ns_link_info *ns = &event->namespaces.link_info[i];
  
  		ns->dev = bswap_64(ns->dev);
  		ns->ino = bswap_64(ns->ino);
  	}
  
  	if (sample_id_all)
  		swap_sample_id_all(event, &event->namespaces.link_info[i]);
  }
  
  static u8 revbyte(u8 b)
  {
  	int rev = (b >> 4) | ((b & 0xf) << 4);
  	rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
  	rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
  	return (u8) rev;
  }
  
  /*
   * XXX this is hack in attempt to carry flags bitfield
   * through endian village. ABI says:
   *
   * Bit-fields are allocated from right to left (least to most significant)
   * on little-endian implementations and from left to right (most to least
   * significant) on big-endian implementations.
   *
   * The above seems to be byte specific, so we need to reverse each
   * byte of the bitfield. 'Internet' also says this might be implementation
   * specific and we probably need proper fix and carry perf_event_attr
   * bitfield flags in separate data file FEAT_ section. Thought this seems
   * to work for now.
   */
  static void swap_bitfield(u8 *p, unsigned len)
  {
  	unsigned i;
  
  	for (i = 0; i < len; i++) {
  		*p = revbyte(*p);
  		p++;
  	}
  }
  
  /* exported for swapping attributes in file header */
  void perf_event__attr_swap(struct perf_event_attr *attr)
  {
  	attr->type		= bswap_32(attr->type);
  	attr->size		= bswap_32(attr->size);
  
  #define bswap_safe(f, n) 					\
  	(attr->size > (offsetof(struct perf_event_attr, f) + 	\
  		       sizeof(attr->f) * (n)))
  #define bswap_field(f, sz) 			\
  do { 						\
  	if (bswap_safe(f, 0))			\
  		attr->f = bswap_##sz(attr->f);	\
  } while(0)
  #define bswap_field_16(f) bswap_field(f, 16)
  #define bswap_field_32(f) bswap_field(f, 32)
  #define bswap_field_64(f) bswap_field(f, 64)
  
  	bswap_field_64(config);
  	bswap_field_64(sample_period);
  	bswap_field_64(sample_type);
  	bswap_field_64(read_format);
  	bswap_field_32(wakeup_events);
  	bswap_field_32(bp_type);
  	bswap_field_64(bp_addr);
  	bswap_field_64(bp_len);
  	bswap_field_64(branch_sample_type);
  	bswap_field_64(sample_regs_user);
  	bswap_field_32(sample_stack_user);
  	bswap_field_32(aux_watermark);
  	bswap_field_16(sample_max_stack);
  
  	/*
  	 * After read_format are bitfields. Check read_format because
  	 * we are unable to use offsetof on bitfield.
  	 */
  	if (bswap_safe(read_format, 1))
  		swap_bitfield((u8 *) (&attr->read_format + 1),
  			      sizeof(u64));
  #undef bswap_field_64
  #undef bswap_field_32
  #undef bswap_field
  #undef bswap_safe
  }
  
  static void perf_event__hdr_attr_swap(union perf_event *event,
  				      bool sample_id_all __maybe_unused)
  {
  	size_t size;
  
  	perf_event__attr_swap(&event->attr.attr);
  
  	size = event->header.size;
  	size -= (void *)&event->attr.id - (void *)event;
  	mem_bswap_64(event->attr.id, size);
  }
  
  static void perf_event__event_update_swap(union perf_event *event,
  					  bool sample_id_all __maybe_unused)
  {
  	event->event_update.type = bswap_64(event->event_update.type);
  	event->event_update.id   = bswap_64(event->event_update.id);
  }
  
  static void perf_event__event_type_swap(union perf_event *event,
  					bool sample_id_all __maybe_unused)
  {
  	event->event_type.event_type.event_id =
  		bswap_64(event->event_type.event_type.event_id);
  }
  
  static void perf_event__tracing_data_swap(union perf_event *event,
  					  bool sample_id_all __maybe_unused)
  {
  	event->tracing_data.size = bswap_32(event->tracing_data.size);
  }
  
  static void perf_event__auxtrace_info_swap(union perf_event *event,
  					   bool sample_id_all __maybe_unused)
  {
  	size_t size;
  
  	event->auxtrace_info.type = bswap_32(event->auxtrace_info.type);
  
  	size = event->header.size;
  	size -= (void *)&event->auxtrace_info.priv - (void *)event;
  	mem_bswap_64(event->auxtrace_info.priv, size);
  }
  
  static void perf_event__auxtrace_swap(union perf_event *event,
  				      bool sample_id_all __maybe_unused)
  {
  	event->auxtrace.size      = bswap_64(event->auxtrace.size);
  	event->auxtrace.offset    = bswap_64(event->auxtrace.offset);
  	event->auxtrace.reference = bswap_64(event->auxtrace.reference);
  	event->auxtrace.idx       = bswap_32(event->auxtrace.idx);
  	event->auxtrace.tid       = bswap_32(event->auxtrace.tid);
  	event->auxtrace.cpu       = bswap_32(event->auxtrace.cpu);
  }
  
  static void perf_event__auxtrace_error_swap(union perf_event *event,
  					    bool sample_id_all __maybe_unused)
  {
  	event->auxtrace_error.type = bswap_32(event->auxtrace_error.type);
  	event->auxtrace_error.code = bswap_32(event->auxtrace_error.code);
  	event->auxtrace_error.cpu  = bswap_32(event->auxtrace_error.cpu);
  	event->auxtrace_error.pid  = bswap_32(event->auxtrace_error.pid);
  	event->auxtrace_error.tid  = bswap_32(event->auxtrace_error.tid);
  	event->auxtrace_error.fmt  = bswap_32(event->auxtrace_error.fmt);
  	event->auxtrace_error.ip   = bswap_64(event->auxtrace_error.ip);
  	if (event->auxtrace_error.fmt)
  		event->auxtrace_error.time = bswap_64(event->auxtrace_error.time);
  }
  
  static void perf_event__thread_map_swap(union perf_event *event,
  					bool sample_id_all __maybe_unused)
  {
  	unsigned i;
  
  	event->thread_map.nr = bswap_64(event->thread_map.nr);
  
  	for (i = 0; i < event->thread_map.nr; i++)
  		event->thread_map.entries[i].pid = bswap_64(event->thread_map.entries[i].pid);
  }
  
  static void perf_event__cpu_map_swap(union perf_event *event,
  				     bool sample_id_all __maybe_unused)
  {
  	struct perf_record_cpu_map_data *data = &event->cpu_map.data;
  	struct cpu_map_entries *cpus;
  	struct perf_record_record_cpu_map *mask;
  	unsigned i;
  
  	data->type = bswap_64(data->type);
  
  	switch (data->type) {
  	case PERF_CPU_MAP__CPUS:
  		cpus = (struct cpu_map_entries *)data->data;
  
  		cpus->nr = bswap_16(cpus->nr);
  
  		for (i = 0; i < cpus->nr; i++)
  			cpus->cpu[i] = bswap_16(cpus->cpu[i]);
  		break;
  	case PERF_CPU_MAP__MASK:
  		mask = (struct perf_record_record_cpu_map *)data->data;
  
  		mask->nr = bswap_16(mask->nr);
  		mask->long_size = bswap_16(mask->long_size);
  
  		switch (mask->long_size) {
  		case 4: mem_bswap_32(&mask->mask, mask->nr); break;
  		case 8: mem_bswap_64(&mask->mask, mask->nr); break;
  		default:
  			pr_err("cpu_map swap: unsupported long size\n");
  		}
  	default:
  		break;
  	}
  }
  
  static void perf_event__stat_config_swap(union perf_event *event,
  					 bool sample_id_all __maybe_unused)
  {
  	u64 size;
  
  	size  = event->stat_config.nr * sizeof(event->stat_config.data[0]);
  	size += 1; /* nr item itself */
  	mem_bswap_64(&event->stat_config.nr, size);
  }
  
  static void perf_event__stat_swap(union perf_event *event,
  				  bool sample_id_all __maybe_unused)
  {
  	event->stat.id     = bswap_64(event->stat.id);
  	event->stat.thread = bswap_32(event->stat.thread);
  	event->stat.cpu    = bswap_32(event->stat.cpu);
  	event->stat.val    = bswap_64(event->stat.val);
  	event->stat.ena    = bswap_64(event->stat.ena);
  	event->stat.run    = bswap_64(event->stat.run);
  }
  
  static void perf_event__stat_round_swap(union perf_event *event,
  					bool sample_id_all __maybe_unused)
  {
  	event->stat_round.type = bswap_64(event->stat_round.type);
  	event->stat_round.time = bswap_64(event->stat_round.time);
  }
  
  typedef void (*perf_event__swap_op)(union perf_event *event,
  				    bool sample_id_all);
  
  static perf_event__swap_op perf_event__swap_ops[] = {
  	[PERF_RECORD_MMAP]		  = perf_event__mmap_swap,
  	[PERF_RECORD_MMAP2]		  = perf_event__mmap2_swap,
  	[PERF_RECORD_COMM]		  = perf_event__comm_swap,
  	[PERF_RECORD_FORK]		  = perf_event__task_swap,
  	[PERF_RECORD_EXIT]		  = perf_event__task_swap,
  	[PERF_RECORD_LOST]		  = perf_event__all64_swap,
  	[PERF_RECORD_READ]		  = perf_event__read_swap,
  	[PERF_RECORD_THROTTLE]		  = perf_event__throttle_swap,
  	[PERF_RECORD_UNTHROTTLE]	  = perf_event__throttle_swap,
  	[PERF_RECORD_SAMPLE]		  = perf_event__all64_swap,
  	[PERF_RECORD_AUX]		  = perf_event__aux_swap,
  	[PERF_RECORD_ITRACE_START]	  = perf_event__itrace_start_swap,
  	[PERF_RECORD_LOST_SAMPLES]	  = perf_event__all64_swap,
  	[PERF_RECORD_SWITCH]		  = perf_event__switch_swap,
  	[PERF_RECORD_SWITCH_CPU_WIDE]	  = perf_event__switch_swap,
  	[PERF_RECORD_NAMESPACES]	  = perf_event__namespaces_swap,
  	[PERF_RECORD_HEADER_ATTR]	  = perf_event__hdr_attr_swap,
  	[PERF_RECORD_HEADER_EVENT_TYPE]	  = perf_event__event_type_swap,
  	[PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
  	[PERF_RECORD_HEADER_BUILD_ID]	  = NULL,
  	[PERF_RECORD_ID_INDEX]		  = perf_event__all64_swap,
  	[PERF_RECORD_AUXTRACE_INFO]	  = perf_event__auxtrace_info_swap,
  	[PERF_RECORD_AUXTRACE]		  = perf_event__auxtrace_swap,
  	[PERF_RECORD_AUXTRACE_ERROR]	  = perf_event__auxtrace_error_swap,
  	[PERF_RECORD_THREAD_MAP]	  = perf_event__thread_map_swap,
  	[PERF_RECORD_CPU_MAP]		  = perf_event__cpu_map_swap,
  	[PERF_RECORD_STAT_CONFIG]	  = perf_event__stat_config_swap,
  	[PERF_RECORD_STAT]		  = perf_event__stat_swap,
  	[PERF_RECORD_STAT_ROUND]	  = perf_event__stat_round_swap,
  	[PERF_RECORD_EVENT_UPDATE]	  = perf_event__event_update_swap,
  	[PERF_RECORD_TIME_CONV]		  = perf_event__all64_swap,
  	[PERF_RECORD_HEADER_MAX]	  = NULL,
  };
  
  /*
   * When perf record finishes a pass on every buffers, it records this pseudo
   * event.
   * We record the max timestamp t found in the pass n.
   * Assuming these timestamps are monotonic across cpus, we know that if
   * a buffer still has events with timestamps below t, they will be all
   * available and then read in the pass n + 1.
   * Hence when we start to read the pass n + 2, we can safely flush every
   * events with timestamps below t.
   *
   *    ============ PASS n =================
   *       CPU 0         |   CPU 1
   *                     |
   *    cnt1 timestamps  |   cnt2 timestamps
   *          1          |         2
   *          2          |         3
   *          -          |         4  <--- max recorded
   *
   *    ============ PASS n + 1 ==============
   *       CPU 0         |   CPU 1
   *                     |
   *    cnt1 timestamps  |   cnt2 timestamps
   *          3          |         5
   *          4          |         6
   *          5          |         7 <---- max recorded
   *
   *      Flush every events below timestamp 4
   *
   *    ============ PASS n + 2 ==============
   *       CPU 0         |   CPU 1
   *                     |
   *    cnt1 timestamps  |   cnt2 timestamps
   *          6          |         8
   *          7          |         9
   *          -          |         10
   *
   *      Flush every events below timestamp 7
   *      etc...
   */
  static int process_finished_round(struct perf_tool *tool __maybe_unused,
  				  union perf_event *event __maybe_unused,
  				  struct ordered_events *oe)
  {
  	if (dump_trace)
  		fprintf(stdout, "\n");
  	return ordered_events__flush(oe, OE_FLUSH__ROUND);
  }
  
  int perf_session__queue_event(struct perf_session *s, union perf_event *event,
  			      u64 timestamp, u64 file_offset)
  {
  	return ordered_events__queue(&s->ordered_events, event, timestamp, file_offset);
  }
  
  static void callchain__lbr_callstack_printf(struct perf_sample *sample)
  {
  	struct ip_callchain *callchain = sample->callchain;
  	struct branch_stack *lbr_stack = sample->branch_stack;
  	u64 kernel_callchain_nr = callchain->nr;
  	unsigned int i;
  
  	for (i = 0; i < kernel_callchain_nr; i++) {
  		if (callchain->ips[i] == PERF_CONTEXT_USER)
  			break;
  	}
  
  	if ((i != kernel_callchain_nr) && lbr_stack->nr) {
  		u64 total_nr;
  		/*
  		 * LBR callstack can only get user call chain,
  		 * i is kernel call chain number,
  		 * 1 is PERF_CONTEXT_USER.
  		 *
  		 * The user call chain is stored in LBR registers.
  		 * LBR are pair registers. The caller is stored
  		 * in "from" register, while the callee is stored
  		 * in "to" register.
  		 * For example, there is a call stack
  		 * "A"->"B"->"C"->"D".
  		 * The LBR registers will recorde like
  		 * "C"->"D", "B"->"C", "A"->"B".
  		 * So only the first "to" register and all "from"
  		 * registers are needed to construct the whole stack.
  		 */
  		total_nr = i + 1 + lbr_stack->nr + 1;
  		kernel_callchain_nr = i + 1;
  
  		printf("... LBR call chain: nr:%" PRIu64 "\n", total_nr);
  
  		for (i = 0; i < kernel_callchain_nr; i++)
  			printf("..... %2d: %016" PRIx64 "\n",
  			       i, callchain->ips[i]);
  
  		printf("..... %2d: %016" PRIx64 "\n",
  		       (int)(kernel_callchain_nr), lbr_stack->entries[0].to);
  		for (i = 0; i < lbr_stack->nr; i++)
  			printf("..... %2d: %016" PRIx64 "\n",
  			       (int)(i + kernel_callchain_nr + 1), lbr_stack->entries[i].from);
  	}
  }
  
  static void callchain__printf(struct evsel *evsel,
  			      struct perf_sample *sample)
  {
  	unsigned int i;
  	struct ip_callchain *callchain = sample->callchain;
  
  	if (perf_evsel__has_branch_callstack(evsel))
  		callchain__lbr_callstack_printf(sample);
  
  	printf("... FP chain: nr:%" PRIu64 "\n", callchain->nr);
  
  	for (i = 0; i < callchain->nr; i++)
  		printf("..... %2d: %016" PRIx64 "\n",
  		       i, callchain->ips[i]);
  }
  
  static void branch_stack__printf(struct perf_sample *sample, bool callstack)
  {
  	uint64_t i;
  
  	printf("%s: nr:%" PRIu64 "\n",
  		!callstack ? "... branch stack" : "... branch callstack",
  		sample->branch_stack->nr);
  
  	for (i = 0; i < sample->branch_stack->nr; i++) {
  		struct branch_entry *e = &sample->branch_stack->entries[i];
  
  		if (!callstack) {
  			printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 " %hu cycles %s%s%s%s %x\n",
  				i, e->from, e->to,
  				(unsigned short)e->flags.cycles,
  				e->flags.mispred ? "M" : " ",
  				e->flags.predicted ? "P" : " ",
  				e->flags.abort ? "A" : " ",
  				e->flags.in_tx ? "T" : " ",
  				(unsigned)e->flags.reserved);
  		} else {
  			printf("..... %2"PRIu64": %016" PRIx64 "\n",
  				i, i > 0 ? e->from : e->to);
  		}
  	}
  }
  
  static void regs_dump__printf(u64 mask, u64 *regs)
  {
  	unsigned rid, i = 0;
  
  	for_each_set_bit(rid, (unsigned long *) &mask, sizeof(mask) * 8) {
  		u64 val = regs[i++];
  
  		printf(".... %-5s 0x%" PRIx64 "\n",
  		       perf_reg_name(rid), val);
  	}
  }
  
  static const char *regs_abi[] = {
  	[PERF_SAMPLE_REGS_ABI_NONE] = "none",
  	[PERF_SAMPLE_REGS_ABI_32] = "32-bit",
  	[PERF_SAMPLE_REGS_ABI_64] = "64-bit",
  };
  
  static inline const char *regs_dump_abi(struct regs_dump *d)
  {
  	if (d->abi > PERF_SAMPLE_REGS_ABI_64)
  		return "unknown";
  
  	return regs_abi[d->abi];
  }
  
  static void regs__printf(const char *type, struct regs_dump *regs)
  {
  	u64 mask = regs->mask;
  
  	printf("... %s regs: mask 0x%" PRIx64 " ABI %s\n",
  	       type,
  	       mask,
  	       regs_dump_abi(regs));
  
  	regs_dump__printf(mask, regs->regs);
  }
  
  static void regs_user__printf(struct perf_sample *sample)
  {
  	struct regs_dump *user_regs = &sample->user_regs;
  
  	if (user_regs->regs)
  		regs__printf("user", user_regs);
  }
  
  static void regs_intr__printf(struct perf_sample *sample)
  {
  	struct regs_dump *intr_regs = &sample->intr_regs;
  
  	if (intr_regs->regs)
  		regs__printf("intr", intr_regs);
  }
  
  static void stack_user__printf(struct stack_dump *dump)
  {
  	printf("... ustack: size %" PRIu64 ", offset 0x%x\n",
  	       dump->size, dump->offset);
  }
  
  static void perf_evlist__print_tstamp(struct evlist *evlist,
  				       union perf_event *event,
  				       struct perf_sample *sample)
  {
  	u64 sample_type = __perf_evlist__combined_sample_type(evlist);
  
  	if (event->header.type != PERF_RECORD_SAMPLE &&
  	    !perf_evlist__sample_id_all(evlist)) {
  		fputs("-1 -1 ", stdout);
  		return;
  	}
  
  	if ((sample_type & PERF_SAMPLE_CPU))
  		printf("%u ", sample->cpu);
  
  	if (sample_type & PERF_SAMPLE_TIME)
  		printf("%" PRIu64 " ", sample->time);
  }
  
  static void sample_read__printf(struct perf_sample *sample, u64 read_format)
  {
  	printf("... sample_read:\n");
  
  	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  		printf("...... time enabled %016" PRIx64 "\n",
  		       sample->read.time_enabled);
  
  	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  		printf("...... time running %016" PRIx64 "\n",
  		       sample->read.time_running);
  
  	if (read_format & PERF_FORMAT_GROUP) {
  		u64 i;
  
  		printf(".... group nr %" PRIu64 "\n", sample->read.group.nr);
  
  		for (i = 0; i < sample->read.group.nr; i++) {
  			struct sample_read_value *value;
  
  			value = &sample->read.group.values[i];
  			printf("..... id %016" PRIx64
  			       ", value %016" PRIx64 "\n",
  			       value->id, value->value);
  		}
  	} else
  		printf("..... id %016" PRIx64 ", value %016" PRIx64 "\n",
  			sample->read.one.id, sample->read.one.value);
  }
  
  static void dump_event(struct evlist *evlist, union perf_event *event,
  		       u64 file_offset, struct perf_sample *sample)
  {
  	if (!dump_trace)
  		return;
  
  	printf("\n%#" PRIx64 " [%#x]: event: %d\n",
  	       file_offset, event->header.size, event->header.type);
  
  	trace_event(event);
  	if (event->header.type == PERF_RECORD_SAMPLE && evlist->trace_event_sample_raw)
  		evlist->trace_event_sample_raw(evlist, event, sample);
  
  	if (sample)
  		perf_evlist__print_tstamp(evlist, event, sample);
  
  	printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
  	       event->header.size, perf_event__name(event->header.type));
  }
  
  static void dump_sample(struct evsel *evsel, union perf_event *event,
  			struct perf_sample *sample)
  {
  	u64 sample_type;
  
  	if (!dump_trace)
  		return;
  
  	printf("(IP, 0x%x): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
  	       event->header.misc, sample->pid, sample->tid, sample->ip,
  	       sample->period, sample->addr);
  
  	sample_type = evsel->core.attr.sample_type;
  
  	if (evsel__has_callchain(evsel))
  		callchain__printf(evsel, sample);
  
  	if (sample_type & PERF_SAMPLE_BRANCH_STACK)
  		branch_stack__printf(sample, perf_evsel__has_branch_callstack(evsel));
  
  	if (sample_type & PERF_SAMPLE_REGS_USER)
  		regs_user__printf(sample);
  
  	if (sample_type & PERF_SAMPLE_REGS_INTR)
  		regs_intr__printf(sample);
  
  	if (sample_type & PERF_SAMPLE_STACK_USER)
  		stack_user__printf(&sample->user_stack);
  
  	if (sample_type & PERF_SAMPLE_WEIGHT)
  		printf("... weight: %" PRIu64 "\n", sample->weight);
  
  	if (sample_type & PERF_SAMPLE_DATA_SRC)
  		printf(" . data_src: 0x%"PRIx64"\n", sample->data_src);
  
  	if (sample_type & PERF_SAMPLE_PHYS_ADDR)
  		printf(" .. phys_addr: 0x%"PRIx64"\n", sample->phys_addr);
  
  	if (sample_type & PERF_SAMPLE_TRANSACTION)
  		printf("... transaction: %" PRIx64 "\n", sample->transaction);
  
  	if (sample_type & PERF_SAMPLE_READ)
  		sample_read__printf(sample, evsel->core.attr.read_format);
  }
  
  static void dump_read(struct evsel *evsel, union perf_event *event)
  {
  	struct perf_record_read *read_event = &event->read;
  	u64 read_format;
  
  	if (!dump_trace)
  		return;
  
  	printf(": %d %d %s %" PRI_lu64 "\n", event->read.pid, event->read.tid,
  	       perf_evsel__name(evsel),
  	       event->read.value);
  
  	if (!evsel)
  		return;
  
  	read_format = evsel->core.attr.read_format;
  
  	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
  		printf("... time enabled : %" PRI_lu64 "\n", read_event->time_enabled);
  
  	if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
  		printf("... time running : %" PRI_lu64 "\n", read_event->time_running);
  
  	if (read_format & PERF_FORMAT_ID)
  		printf("... id           : %" PRI_lu64 "\n", read_event->id);
  }
  
  static struct machine *machines__find_for_cpumode(struct machines *machines,
  					       union perf_event *event,
  					       struct perf_sample *sample)
  {
  	struct machine *machine;
  
  	if (perf_guest &&
  	    ((sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ||
  	     (sample->cpumode == PERF_RECORD_MISC_GUEST_USER))) {
  		u32 pid;
  
  		if (event->header.type == PERF_RECORD_MMAP
  		    || event->header.type == PERF_RECORD_MMAP2)
  			pid = event->mmap.pid;
  		else
  			pid = sample->pid;
  
  		machine = machines__find(machines, pid);
  		if (!machine)
  			machine = machines__findnew(machines, DEFAULT_GUEST_KERNEL_ID);
  		return machine;
  	}
  
  	return &machines->host;
  }
  
  static int deliver_sample_value(struct evlist *evlist,
  				struct perf_tool *tool,
  				union perf_event *event,
  				struct perf_sample *sample,
  				struct sample_read_value *v,
  				struct machine *machine)
  {
  	struct perf_sample_id *sid = perf_evlist__id2sid(evlist, v->id);
  	struct evsel *evsel;
  
  	if (sid) {
  		sample->id     = v->id;
  		sample->period = v->value - sid->period;
  		sid->period    = v->value;
  	}
  
  	if (!sid || sid->evsel == NULL) {
  		++evlist->stats.nr_unknown_id;
  		return 0;
  	}
  
  	/*
  	 * There's no reason to deliver sample
  	 * for zero period, bail out.
  	 */
  	if (!sample->period)
  		return 0;
  
  	evsel = container_of(sid->evsel, struct evsel, core);
  	return tool->sample(tool, event, sample, evsel, machine);
  }
  
  static int deliver_sample_group(struct evlist *evlist,
  				struct perf_tool *tool,
  				union  perf_event *event,
  				struct perf_sample *sample,
  				struct machine *machine)
  {
  	int ret = -EINVAL;
  	u64 i;
  
  	for (i = 0; i < sample->read.group.nr; i++) {
  		ret = deliver_sample_value(evlist, tool, event, sample,
  					   &sample->read.group.values[i],
  					   machine);
  		if (ret)
  			break;
  	}
  
  	return ret;
  }
  
  static int
   perf_evlist__deliver_sample(struct evlist *evlist,
  			     struct perf_tool *tool,
  			     union  perf_event *event,
  			     struct perf_sample *sample,
  			     struct evsel *evsel,
  			     struct machine *machine)
  {
  	/* We know evsel != NULL. */
  	u64 sample_type = evsel->core.attr.sample_type;
  	u64 read_format = evsel->core.attr.read_format;
  
  	/* Standard sample delivery. */
  	if (!(sample_type & PERF_SAMPLE_READ))
  		return tool->sample(tool, event, sample, evsel, machine);
  
  	/* For PERF_SAMPLE_READ we have either single or group mode. */
  	if (read_format & PERF_FORMAT_GROUP)
  		return deliver_sample_group(evlist, tool, event, sample,
  					    machine);
  	else
  		return deliver_sample_value(evlist, tool, event, sample,
  					    &sample->read.one, machine);
  }
  
  static int machines__deliver_event(struct machines *machines,
  				   struct evlist *evlist,
  				   union perf_event *event,
  				   struct perf_sample *sample,
  				   struct perf_tool *tool, u64 file_offset)
  {
  	struct evsel *evsel;
  	struct machine *machine;
  
  	dump_event(evlist, event, file_offset, sample);
  
  	evsel = perf_evlist__id2evsel(evlist, sample->id);
  
  	machine = machines__find_for_cpumode(machines, event, sample);
  
  	switch (event->header.type) {
  	case PERF_RECORD_SAMPLE:
  		if (evsel == NULL) {
  			++evlist->stats.nr_unknown_id;
  			return 0;
  		}
  		dump_sample(evsel, event, sample);
  		if (machine == NULL) {
  			++evlist->stats.nr_unprocessable_samples;
  			return 0;
  		}
  		return perf_evlist__deliver_sample(evlist, tool, event, sample, evsel, machine);
  	case PERF_RECORD_MMAP:
  		return tool->mmap(tool, event, sample, machine);
  	case PERF_RECORD_MMAP2:
  		if (event->header.misc & PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT)
  			++evlist->stats.nr_proc_map_timeout;
  		return tool->mmap2(tool, event, sample, machine);
  	case PERF_RECORD_COMM:
  		return tool->comm(tool, event, sample, machine);
  	case PERF_RECORD_NAMESPACES:
  		return tool->namespaces(tool, event, sample, machine);
  	case PERF_RECORD_FORK:
  		return tool->fork(tool, event, sample, machine);
  	case PERF_RECORD_EXIT:
  		return tool->exit(tool, event, sample, machine);
  	case PERF_RECORD_LOST:
  		if (tool->lost == perf_event__process_lost)
  			evlist->stats.total_lost += event->lost.lost;
  		return tool->lost(tool, event, sample, machine);
  	case PERF_RECORD_LOST_SAMPLES:
  		if (tool->lost_samples == perf_event__process_lost_samples)
  			evlist->stats.total_lost_samples += event->lost_samples.lost;
  		return tool->lost_samples(tool, event, sample, machine);
  	case PERF_RECORD_READ:
  		dump_read(evsel, event);
  		return tool->read(tool, event, sample, evsel, machine);
  	case PERF_RECORD_THROTTLE:
  		return tool->throttle(tool, event, sample, machine);
  	case PERF_RECORD_UNTHROTTLE:
  		return tool->unthrottle(tool, event, sample, machine);
  	case PERF_RECORD_AUX:
  		if (tool->aux == perf_event__process_aux) {
  			if (event->aux.flags & PERF_AUX_FLAG_TRUNCATED)
  				evlist->stats.total_aux_lost += 1;
  			if (event->aux.flags & PERF_AUX_FLAG_PARTIAL)
  				evlist->stats.total_aux_partial += 1;
  		}
  		return tool->aux(tool, event, sample, machine);
  	case PERF_RECORD_ITRACE_START:
  		return tool->itrace_start(tool, event, sample, machine);
  	case PERF_RECORD_SWITCH:
  	case PERF_RECORD_SWITCH_CPU_WIDE:
  		return tool->context_switch(tool, event, sample, machine);
  	case PERF_RECORD_KSYMBOL:
  		return tool->ksymbol(tool, event, sample, machine);
  	case PERF_RECORD_BPF_EVENT:
  		return tool->bpf(tool, event, sample, machine);
  	default:
  		++evlist->stats.nr_unknown_events;
  		return -1;
  	}
  }
  
  static int perf_session__deliver_event(struct perf_session *session,
  				       union perf_event *event,
  				       struct perf_tool *tool,
  				       u64 file_offset)
  {
  	struct perf_sample sample;
  	int ret;
  
  	ret = perf_evlist__parse_sample(session->evlist, event, &sample);
  	if (ret) {
  		pr_err("Can't parse sample, err = %d\n", ret);
  		return ret;
  	}
  
  	ret = auxtrace__process_event(session, event, &sample, tool);
  	if (ret < 0)
  		return ret;
  	if (ret > 0)
  		return 0;
  
  	return machines__deliver_event(&session->machines, session->evlist,
  				       event, &sample, tool, file_offset);
  }
  
  static s64 perf_session__process_user_event(struct perf_session *session,
  					    union perf_event *event,
  					    u64 file_offset)
  {
  	struct ordered_events *oe = &session->ordered_events;
  	struct perf_tool *tool = session->tool;
  	struct perf_sample sample = { .time = 0, };
  	int fd = perf_data__fd(session->data);
  	int err;
  
  	if (event->header.type != PERF_RECORD_COMPRESSED ||
  	    tool->compressed == perf_session__process_compressed_event_stub)
  		dump_event(session->evlist, event, file_offset, &sample);
  
  	/* 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);
  			perf_session__set_comm_exec(session);
  		}
  		return err;
  	case PERF_RECORD_EVENT_UPDATE:
  		return tool->event_update(tool, event, &session->evlist);
  	case PERF_RECORD_HEADER_EVENT_TYPE:
  		/*
  		 * Depreceated, but we need to handle it for sake
  		 * of old data files create in pipe mode.
  		 */
  		return 0;
  	case PERF_RECORD_HEADER_TRACING_DATA:
  		/* setup for reading amidst mmap */
  		lseek(fd, file_offset, SEEK_SET);
  		return tool->tracing_data(session, event);
  	case PERF_RECORD_HEADER_BUILD_ID:
  		return tool->build_id(session, event);
  	case PERF_RECORD_FINISHED_ROUND:
  		return tool->finished_round(tool, event, oe);
  	case PERF_RECORD_ID_INDEX:
  		return tool->id_index(session, event);
  	case PERF_RECORD_AUXTRACE_INFO:
  		return tool->auxtrace_info(session, event);
  	case PERF_RECORD_AUXTRACE:
  		/* setup for reading amidst mmap */
  		lseek(fd, file_offset + event->header.size, SEEK_SET);
  		return tool->auxtrace(session, event);
  	case PERF_RECORD_AUXTRACE_ERROR:
  		perf_session__auxtrace_error_inc(session, event);
  		return tool->auxtrace_error(session, event);
  	case PERF_RECORD_THREAD_MAP:
  		return tool->thread_map(session, event);
  	case PERF_RECORD_CPU_MAP:
  		return tool->cpu_map(session, event);
  	case PERF_RECORD_STAT_CONFIG:
  		return tool->stat_config(session, event);
  	case PERF_RECORD_STAT:
  		return tool->stat(session, event);
  	case PERF_RECORD_STAT_ROUND:
  		return tool->stat_round(session, event);
  	case PERF_RECORD_TIME_CONV:
  		session->time_conv = event->time_conv;
  		return tool->time_conv(session, event);
  	case PERF_RECORD_HEADER_FEATURE:
  		return tool->feature(session, event);
  	case PERF_RECORD_COMPRESSED:
  		err = tool->compressed(session, event, file_offset);
  		if (err)
  			dump_event(session->evlist, event, file_offset, &sample);
  		return err;
  	default:
  		return -EINVAL;
  	}
  }
  
  int perf_session__deliver_synth_event(struct perf_session *session,
  				      union perf_event *event,
  				      struct perf_sample *sample)
  {
  	struct evlist *evlist = session->evlist;
  	struct perf_tool *tool = session->tool;
  
  	events_stats__inc(&evlist->stats, event->header.type);
  
  	if (event->header.type >= PERF_RECORD_USER_TYPE_START)
  		return perf_session__process_user_event(session, event, 0);
  
  	return machines__deliver_event(&session->machines, evlist, event, sample, tool, 0);
  }
  
  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);
  }
  
  int perf_session__peek_event(struct perf_session *session, off_t file_offset,
  			     void *buf, size_t buf_sz,
  			     union perf_event **event_ptr,
  			     struct perf_sample *sample)
  {
  	union perf_event *event;
  	size_t hdr_sz, rest;
  	int fd;
  
  	if (session->one_mmap && !session->header.needs_swap) {
  		event = file_offset - session->one_mmap_offset +
  			session->one_mmap_addr;
  		goto out_parse_sample;
  	}
  
  	if (perf_data__is_pipe(session->data))
  		return -1;
  
  	fd = perf_data__fd(session->data);
  	hdr_sz = sizeof(struct perf_event_header);
  
  	if (buf_sz < hdr_sz)
  		return -1;
  
  	if (lseek(fd, file_offset, SEEK_SET) == (off_t)-1 ||
  	    readn(fd, buf, hdr_sz) != (ssize_t)hdr_sz)
  		return -1;
  
  	event = (union perf_event *)buf;
  
  	if (session->header.needs_swap)
  		perf_event_header__bswap(&event->header);
  
  	if (event->header.size < hdr_sz || event->header.size > buf_sz)
  		return -1;
  
  	rest = event->header.size - hdr_sz;
  
  	if (readn(fd, buf, rest) != (ssize_t)rest)
  		return -1;
  
  	if (session->header.needs_swap)
  		event_swap(event, perf_evlist__sample_id_all(session->evlist));
  
  out_parse_sample:
  
  	if (sample && event->header.type < PERF_RECORD_USER_TYPE_START &&
  	    perf_evlist__parse_sample(session->evlist, event, sample))
  		return -1;
  
  	*event_ptr = event;
  
  	return 0;
  }
  
  static s64 perf_session__process_event(struct perf_session *session,
  				       union perf_event *event, u64 file_offset)
  {
  	struct evlist *evlist = session->evlist;
  	struct perf_tool *tool = session->tool;
  	int ret;
  
  	if (session->header.needs_swap)
  		event_swap(event, perf_evlist__sample_id_all(evlist));
  
  	if (event->header.type >= PERF_RECORD_HEADER_MAX)
  		return -EINVAL;
  
  	events_stats__inc(&evlist->stats, event->header.type);
  
  	if (event->header.type >= PERF_RECORD_USER_TYPE_START)
  		return perf_session__process_user_event(session, event, file_offset);
  
  	if (tool->ordered_events) {
  		u64 timestamp = -1ULL;
  
  		ret = perf_evlist__parse_sample_timestamp(evlist, event, &timestamp);
  		if (ret && ret != -1)
  			return ret;
  
  		ret = perf_session__queue_event(session, event, timestamp, file_offset);
  		if (ret != -ETIME)
  			return ret;
  	}
  
  	return perf_session__deliver_event(session, event, tool, file_offset);
  }
  
  void perf_event_header__bswap(struct perf_event_header *hdr)
  {
  	hdr->type = bswap_32(hdr->type);
  	hdr->misc = bswap_16(hdr->misc);
  	hdr->size = bswap_16(hdr->size);
  }
  
  struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
  {
  	return machine__findnew_thread(&session->machines.host, -1, pid);
  }
  
  /*
   * Threads are identified by pid and tid, and the idle task has pid == tid == 0.
   * So here a single thread is created for that, but actually there is a separate
   * idle task per cpu, so there should be one 'struct thread' per cpu, but there
   * is only 1. That causes problems for some tools, requiring workarounds. For
   * example get_idle_thread() in builtin-sched.c, or thread_stack__per_cpu().
   */
  int perf_session__register_idle_thread(struct perf_session *session)
  {
  	struct thread *thread;
  	int err = 0;
  
  	thread = machine__findnew_thread(&session->machines.host, 0, 0);
  	if (thread == NULL || thread__set_comm(thread, "swapper", 0)) {
  		pr_err("problem inserting idle task.\n");
  		err = -1;
  	}
  
  	if (thread == NULL || thread__set_namespaces(thread, 0, NULL)) {
  		pr_err("problem inserting idle task.\n");
  		err = -1;
  	}
  
  	/* machine__findnew_thread() got the thread, so put it */
  	thread__put(thread);
  	return err;
  }
  
  static void
  perf_session__warn_order(const struct perf_session *session)
  {
  	const struct ordered_events *oe = &session->ordered_events;
  	struct evsel *evsel;
  	bool should_warn = true;
  
  	evlist__for_each_entry(session->evlist, evsel) {
  		if (evsel->core.attr.write_backward)
  			should_warn = false;
  	}
  
  	if (!should_warn)
  		return;
  	if (oe->nr_unordered_events != 0)
  		ui__warning("%u out of order events recorded.\n", oe->nr_unordered_events);
  }
  
  static void perf_session__warn_about_errors(const struct perf_session *session)
  {
  	const struct events_stats *stats = &session->evlist->stats;
  
  	if (session->tool->lost == perf_event__process_lost &&
  	    stats->nr_events[PERF_RECORD_LOST] != 0) {
  		ui__warning("Processed %d events and lost %d chunks!\n\n"
  			    "Check IO/CPU overload!\n\n",
  			    stats->nr_events[0],
  			    stats->nr_events[PERF_RECORD_LOST]);
  	}
  
  	if (session->tool->lost_samples == perf_event__process_lost_samples) {
  		double drop_rate;
  
  		drop_rate = (double)stats->total_lost_samples /
  			    (double) (stats->nr_events[PERF_RECORD_SAMPLE] + stats->total_lost_samples);
  		if (drop_rate > 0.05) {
  			ui__warning("Processed %" PRIu64 " samples and lost %3.2f%%!\n\n",
  				    stats->nr_events[PERF_RECORD_SAMPLE] + stats->total_lost_samples,
  				    drop_rate * 100.0);
  		}
  	}
  
  	if (session->tool->aux == perf_event__process_aux &&
  	    stats->total_aux_lost != 0) {
  		ui__warning("AUX data lost %" PRIu64 " times out of %u!\n\n",
  			    stats->total_aux_lost,
  			    stats->nr_events[PERF_RECORD_AUX]);
  	}
  
  	if (session->tool->aux == perf_event__process_aux &&
  	    stats->total_aux_partial != 0) {
  		bool vmm_exclusive = false;
  
  		(void)sysfs__read_bool("module/kvm_intel/parameters/vmm_exclusive",
  		                       &vmm_exclusive);
  
  		ui__warning("AUX data had gaps in it %" PRIu64 " times out of %u!\n\n"
  		            "Are you running a KVM guest in the background?%s\n\n",
  			    stats->total_aux_partial,
  			    stats->nr_events[PERF_RECORD_AUX],
  			    vmm_exclusive ?
  			    "\nReloading kvm_intel module with vmm_exclusive=0\n"
  			    "will reduce the gaps to only guest's timeslices." :
  			    "");
  	}
  
  	if (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",
  			    stats->nr_unknown_events);
  	}
  
  	if (stats->nr_unknown_id != 0) {
  		ui__warning("%u samples with id not present in the header\n",
  			    stats->nr_unknown_id);
  	}
  
  	if (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",
  			    stats->nr_invalid_chains,
  			    stats->nr_events[PERF_RECORD_SAMPLE]);
  	}
  
  	if (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",
  			    stats->nr_unprocessable_samples);
  	}
  
  	perf_session__warn_order(session);
  
  	events_stats__auxtrace_error_warn(stats);
  
  	if (stats->nr_proc_map_timeout != 0) {
  		ui__warning("%d map information files for pre-existing threads were\n"
  			    "not processed, if there are samples for addresses they\n"
  			    "will not be resolved, you may find out which are these\n"
  			    "threads by running with -v and redirecting the output\n"
  			    "to a file.\n"
  			    "The time limit to process proc map is too short?\n"
  			    "Increase it by --proc-map-timeout\n",
  			    stats->nr_proc_map_timeout);
  	}
  }
  
  static int perf_session__flush_thread_stack(struct thread *thread,
  					    void *p __maybe_unused)
  {
  	return thread_stack__flush(thread);
  }
  
  static int perf_session__flush_thread_stacks(struct perf_session *session)
  {
  	return machines__for_each_thread(&session->machines,
  					 perf_session__flush_thread_stack,
  					 NULL);
  }
  
  volatile int session_done;
  
  static int __perf_session__process_decomp_events(struct perf_session *session);
  
  static int __perf_session__process_pipe_events(struct perf_session *session)
  {
  	struct ordered_events *oe = &session->ordered_events;
  	struct perf_tool *tool = session->tool;
  	int fd = perf_data__fd(session->data);
  	union perf_event *event;
  	uint32_t size, cur_size = 0;
  	void *buf = NULL;
  	s64 skip = 0;
  	u64 head;
  	ssize_t err;
  	void *p;
  
  	perf_tool__fill_defaults(tool);
  
  	head = 0;
  	cur_size = sizeof(union perf_event);
  
  	buf = malloc(cur_size);
  	if (!buf)
  		return -errno;
  	ordered_events__set_copy_on_queue(oe, true);
  more:
  	event = buf;
  	err = readn(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 (session->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(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(session, event, 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;
  
  	err = __perf_session__process_decomp_events(session);
  	if (err)
  		goto out_err;
  
  	if (!session_done())
  		goto more;
  done:
  	/* do the final flush for ordered samples */
  	err = ordered_events__flush(oe, OE_FLUSH__FINAL);
  	if (err)
  		goto out_err;
  	err = auxtrace__flush_events(session, tool);
  	if (err)
  		goto out_err;
  	err = perf_session__flush_thread_stacks(session);
  out_err:
  	free(buf);
  	if (!tool->no_warn)
  		perf_session__warn_about_errors(session);
  	ordered_events__free(&session->ordered_events);
  	auxtrace__free_events(session);
  	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);
  		pr_debug("%s: head=%#" PRIx64 " event->header_size=%#x, mmap_size=%#zx: fuzzed perf.data?\n",
  			 __func__, head, event->header.size, mmap_size);
  		return ERR_PTR(-EINVAL);
  	}
  
  	return event;
  }
  
  static int __perf_session__process_decomp_events(struct perf_session *session)
  {
  	s64 skip;
  	u64 size, file_pos = 0;
  	struct decomp *decomp = session->decomp_last;
  
  	if (!decomp)
  		return 0;
  
  	while (decomp->head < decomp->size && !session_done()) {
  		union perf_event *event = fetch_mmaped_event(session, decomp->head, decomp->size, decomp->data);
  
  		if (IS_ERR(event))
  			return PTR_ERR(event);
  
  		if (!event)
  			break;
  
  		size = event->header.size;
  
  		if (size < sizeof(struct perf_event_header) ||
  		    (skip = perf_session__process_event(session, event, file_pos)) < 0) {
  			pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
  				decomp->file_pos + decomp->head, event->header.size, event->header.type);
  			return -EINVAL;
  		}
  
  		if (skip)
  			size += skip;
  
  		decomp->head += size;
  	}
  
  	return 0;
  }
  
  /*
   * 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
  
  struct reader;
  
  typedef s64 (*reader_cb_t)(struct perf_session *session,
  			   union perf_event *event,
  			   u64 file_offset);
  
  struct reader {
  	int		 fd;
  	u64		 data_size;
  	u64		 data_offset;
  	reader_cb_t	 process;
  };
  
  static int
  reader__process_events(struct reader *rd, struct perf_session *session,
  		       struct ui_progress *prog)
  {
  	u64 data_size = rd->data_size;
  	u64 head, page_offset, file_offset, file_pos, size;
  	int err = 0, mmap_prot, mmap_flags, map_idx = 0;
  	size_t	mmap_size;
  	char *buf, *mmaps[NUM_MMAPS];
  	union perf_event *event;
  	s64 skip;
  
  	page_offset = page_size * (rd->data_offset / page_size);
  	file_offset = page_offset;
  	head = rd->data_offset - page_offset;
  
  	ui_progress__init_size(prog, data_size, "Processing events...");
  
  	data_size += rd->data_offset;
  
  	mmap_size = MMAP_SIZE;
  	if (mmap_size > data_size) {
  		mmap_size = data_size;
  		session->one_mmap = true;
  	}
  
  	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, rd->fd,
  		   file_offset);
  	if (buf == MAP_FAILED) {
  		pr_err("failed to mmap file\n");
  		err = -errno;
  		goto out;
  	}
  	mmaps[map_idx] = buf;
  	map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
  	file_pos = file_offset + head;
  	if (session->one_mmap) {
  		session->one_mmap_addr = buf;
  		session->one_mmap_offset = file_offset;
  	}
  
  more:
  	event = fetch_mmaped_event(session, head, mmap_size, buf);
  	if (IS_ERR(event))
  		return PTR_ERR(event);
  
  	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;
  
  	skip = -EINVAL;
  
  	if (size < sizeof(struct perf_event_header) ||
  	    (skip = rd->process(session, event, file_pos)) < 0) {
  		pr_err("%#" PRIx64 " [%#x]: failed to process type: %d [%s]\n",
  		       file_offset + head, event->header.size,
  		       event->header.type, strerror(-skip));
  		err = skip;
  		goto out;
  	}
  
  	if (skip)
  		size += skip;
  
  	head += size;
  	file_pos += size;
  
  	err = __perf_session__process_decomp_events(session);
  	if (err)
  		goto out;
  
  	ui_progress__update(prog, size);
  
  	if (session_done())
  		goto out;
  
  	if (file_pos < data_size)
  		goto more;
  
  out:
  	return err;
  }
  
  static s64 process_simple(struct perf_session *session,
  			  union perf_event *event,
  			  u64 file_offset)
  {
  	return perf_session__process_event(session, event, file_offset);
  }
  
  static int __perf_session__process_events(struct perf_session *session)
  {
  	struct reader rd = {
  		.fd		= perf_data__fd(session->data),
  		.data_size	= session->header.data_size,
  		.data_offset	= session->header.data_offset,
  		.process	= process_simple,
  	};
  	struct ordered_events *oe = &session->ordered_events;
  	struct perf_tool *tool = session->tool;
  	struct ui_progress prog;
  	int err;
  
  	perf_tool__fill_defaults(tool);
  
  	if (rd.data_size == 0)
  		return -1;
  
  	ui_progress__init_size(&prog, rd.data_size, "Processing events...");
  
  	err = reader__process_events(&rd, session, &prog);
  	if (err)
  		goto out_err;
  	/* do the final flush for ordered samples */
  	err = ordered_events__flush(oe, OE_FLUSH__FINAL);
  	if (err)
  		goto out_err;
  	err = auxtrace__flush_events(session, tool);
  	if (err)
  		goto out_err;
  	err = perf_session__flush_thread_stacks(session);
  out_err:
  	ui_progress__finish();
  	if (!tool->no_warn)
  		perf_session__warn_about_errors(session);
  	/*
  	 * We may switching perf.data output, make ordered_events
  	 * reusable.
  	 */
  	ordered_events__reinit(&session->ordered_events);
  	auxtrace__free_events(session);
  	session->one_mmap = false;
  	return err;
  }
  
  int perf_session__process_events(struct perf_session *session)
  {
  	if (perf_session__register_idle_thread(session) < 0)
  		return -ENOMEM;
  
  	if (perf_data__is_pipe(session->data))
  		return __perf_session__process_pipe_events(session);
  
  	return __perf_session__process_events(session);
  }
  
  bool perf_session__has_traces(struct perf_session *session, const char *msg)
  {
  	struct evsel *evsel;
  
  	evlist__for_each_entry(session->evlist, evsel) {
  		if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT)
  			return true;
  	}
  
  	pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
  	return false;
  }
  
  int map__set_kallsyms_ref_reloc_sym(struct map *map, const char *symbol_name, u64 addr)
  {
  	char *bracket;
  	struct ref_reloc_sym *ref;
  	struct kmap *kmap;
  
  	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;
  
  	kmap = map__kmap(map);
  	if (kmap)
  		kmap->ref_reloc_sym = ref;
  
  	return 0;
  }
  
  size_t perf_session__fprintf_dsos(struct perf_session *session, FILE *fp)
  {
  	return machines__fprintf_dsos(&session->machines, fp);
  }
  
  size_t perf_session__fprintf_dsos_buildid(struct perf_session *session, FILE *fp,
  					  bool (skip)(struct dso *dso, int parm), int parm)
  {
  	return machines__fprintf_dsos_buildid(&session->machines, fp, skip, parm);
  }
  
  size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
  {
  	size_t ret;
  	const char *msg = "";
  
  	if (perf_header__has_feat(&session->header, HEADER_AUXTRACE))
  		msg = " (excludes AUX area (e.g. instruction trace) decoded / synthesized events)";
  
  	ret = fprintf(fp, "\nAggregated stats:%s\n", msg);
  
  	ret += events_stats__fprintf(&session->evlist->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 evsel *perf_session__find_first_evtype(struct perf_session *session,
  					      unsigned int type)
  {
  	struct evsel *pos;
  
  	evlist__for_each_entry(session->evlist, pos) {
  		if (pos->core.attr.type == type)
  			return pos;
  	}
  	return NULL;
  }
  
  int perf_session__cpu_bitmap(struct perf_session *session,
  			     const char *cpu_list, unsigned long *cpu_bitmap)
  {
  	int i, err = -1;
  	struct perf_cpu_map *map;
  	int nr_cpus = min(session->header.env.nr_cpus_online, MAX_NR_CPUS);
  
  	for (i = 0; i < PERF_TYPE_MAX; ++i) {
  		struct evsel *evsel;
  
  		evsel = perf_session__find_first_evtype(session, i);
  		if (!evsel)
  			continue;
  
  		if (!(evsel->core.attr.sample_type & PERF_SAMPLE_CPU)) {
  			pr_err("File does not contain CPU events. "
  			       "Remove -C option to proceed.\n");
  			return -1;
  		}
  	}
  
  	map = perf_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 >= nr_cpus) {
  			pr_err("Requested CPU %d too large. "
  			       "Consider raising MAX_NR_CPUS\n", cpu);
  			goto out_delete_map;
  		}
  
  		set_bit(cpu, cpu_bitmap);
  	}
  
  	err = 0;
  
  out_delete_map:
  	perf_cpu_map__put(map);
  	return err;
  }
  
  void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
  				bool full)
  {
  	if (session == NULL || fp == NULL)
  		return;
  
  	fprintf(fp, "# ========\n");
  	perf_header__fprintf_info(session, fp, full);
  	fprintf(fp, "# ========\n#\n");
  }
  
  
  int __perf_session__set_tracepoints_handlers(struct perf_session *session,
  					     const struct evsel_str_handler *assocs,
  					     size_t nr_assocs)
  {
  	struct 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 != NULL)
  			goto out;
  		evsel->handler = assocs[i].handler;
  	}
  
  	err = 0;
  out:
  	return err;
  }
  
  int perf_event__process_id_index(struct perf_session *session,
  				 union perf_event *event)
  {
  	struct evlist *evlist = session->evlist;
  	struct perf_record_id_index *ie = &event->id_index;
  	size_t i, nr, max_nr;
  
  	max_nr = (ie->header.size - sizeof(struct perf_record_id_index)) /
  		 sizeof(struct id_index_entry);
  	nr = ie->nr;
  	if (nr > max_nr)
  		return -EINVAL;
  
  	if (dump_trace)
  		fprintf(stdout, " nr: %zu\n", nr);
  
  	for (i = 0; i < nr; i++) {
  		struct id_index_entry *e = &ie->entries[i];
  		struct perf_sample_id *sid;
  
  		if (dump_trace) {
  			fprintf(stdout,	" ... id: %"PRI_lu64, e->id);
  			fprintf(stdout,	"  idx: %"PRI_lu64, e->idx);
  			fprintf(stdout,	"  cpu: %"PRI_ld64, e->cpu);
  			fprintf(stdout,	"  tid: %"PRI_ld64"\n", e->tid);
  		}
  
  		sid = perf_evlist__id2sid(evlist, e->id);
  		if (!sid)
  			return -ENOENT;
  		sid->idx = e->idx;
  		sid->cpu = e->cpu;
  		sid->tid = e->tid;
  	}
  	return 0;
  }
  