1/*
   2 * builtin-trace.c
   3 *
   4 * Builtin 'trace' command:
   5 *
   6 * Display a continuously updated trace of any workload, CPU, specific PID,
   7 * system wide, etc.  Default format is loosely strace like, but any other
   8 * event may be specified using --event.
   9 *
  10 * Copyright (C) 2012, 2013, 2014, 2015 Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
  11 *
  12 * Initially based on the 'trace' prototype by Thomas Gleixner:
  13 *
  14 * http://lwn.net/Articles/415728/ ("Announcing a new utility: 'trace'")
  15 */
  16
  17#include "util/record.h"
  18#include <traceevent/event-parse.h>
  19#include <api/fs/tracing_path.h>
  20#include <bpf/bpf.h>
  21#include "util/bpf_map.h"
  22#include "util/rlimit.h"
  23#include "builtin.h"
  24#include "util/cgroup.h"
  25#include "util/color.h"
  26#include "util/config.h"
  27#include "util/debug.h"
  28#include "util/dso.h"
  29#include "util/env.h"
  30#include "util/event.h"
  31#include "util/evsel.h"
  32#include "util/evsel_fprintf.h"
  33#include "util/synthetic-events.h"
  34#include "util/evlist.h"
  35#include "util/evswitch.h"
  36#include "util/mmap.h"
  37#include <subcmd/pager.h>
  38#include <subcmd/exec-cmd.h>
  39#include "util/machine.h"
  40#include "util/map.h"
  41#include "util/symbol.h"
  42#include "util/path.h"
  43#include "util/session.h"
  44#include "util/thread.h"
  45#include <subcmd/parse-options.h>
  46#include "util/strlist.h"
  47#include "util/intlist.h"
  48#include "util/thread_map.h"
  49#include "util/stat.h"
  50#include "util/tool.h"
  51#include "util/util.h"
  52#include "trace/beauty/beauty.h"
  53#include "trace-event.h"
  54#include "util/parse-events.h"
  55#include "util/bpf-loader.h"
  56#include "callchain.h"
  57#include "print_binary.h"
  58#include "string2.h"
  59#include "syscalltbl.h"
  60#include "rb_resort.h"
  61#include "../perf.h"
  62
  63#include <errno.h>
  64#include <inttypes.h>
  65#include <poll.h>
  66#include <signal.h>
  67#include <stdlib.h>
  68#include <string.h>
  69#include <linux/err.h>
  70#include <linux/filter.h>
  71#include <linux/kernel.h>
  72#include <linux/random.h>
  73#include <linux/stringify.h>
  74#include <linux/time64.h>
  75#include <linux/zalloc.h>
  76#include <fcntl.h>
  77#include <sys/sysmacros.h>
  78
  79#include <linux/ctype.h>
 
  80
  81#ifndef O_CLOEXEC
  82# define O_CLOEXEC		02000000
  83#endif
  84
  85#ifndef F_LINUX_SPECIFIC_BASE
  86# define F_LINUX_SPECIFIC_BASE	1024
  87#endif
  88
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  89struct trace {
  90	struct perf_tool	tool;
  91	struct syscalltbl	*sctbl;
  92	struct {
  93		struct syscall  *table;
  94		struct bpf_map  *map;
  95		struct { // per syscall BPF_MAP_TYPE_PROG_ARRAY
  96			struct bpf_map  *sys_enter,
  97					*sys_exit;
  98		}		prog_array;
  99		struct {
 100			struct evsel *sys_enter,
 101					  *sys_exit,
 102					  *augmented;
 103		}		events;
 104		struct bpf_program *unaugmented_prog;
 105	} syscalls;
 106	struct {
 107		struct bpf_map *map;
 108	} dump;
 109	struct record_opts	opts;
 110	struct evlist	*evlist;
 111	struct machine		*host;
 112	struct thread		*current;
 113	struct bpf_object	*bpf_obj;
 114	struct cgroup		*cgroup;
 115	u64			base_time;
 116	FILE			*output;
 117	unsigned long		nr_events;
 118	unsigned long		nr_events_printed;
 119	unsigned long		max_events;
 120	struct evswitch		evswitch;
 121	struct strlist		*ev_qualifier;
 122	struct {
 123		size_t		nr;
 124		int		*entries;
 125	}			ev_qualifier_ids;
 126	struct {
 127		size_t		nr;
 128		pid_t		*entries;
 129		struct bpf_map  *map;
 130	}			filter_pids;
 131	double			duration_filter;
 132	double			runtime_ms;
 133	struct {
 134		u64		vfs_getname,
 135				proc_getname;
 136	} stats;
 137	unsigned int		max_stack;
 138	unsigned int		min_stack;
 139	int			raw_augmented_syscalls_args_size;
 140	bool			raw_augmented_syscalls;
 141	bool			fd_path_disabled;
 142	bool			sort_events;
 143	bool			not_ev_qualifier;
 144	bool			live;
 145	bool			full_time;
 146	bool			sched;
 147	bool			multiple_threads;
 148	bool			summary;
 149	bool			summary_only;
 
 150	bool			failure_only;
 151	bool			show_comm;
 152	bool			print_sample;
 153	bool			show_tool_stats;
 154	bool			trace_syscalls;
 
 155	bool			kernel_syscallchains;
 156	s16			args_alignment;
 157	bool			show_tstamp;
 158	bool			show_duration;
 159	bool			show_zeros;
 160	bool			show_arg_names;
 161	bool			show_string_prefix;
 162	bool			force;
 163	bool			vfs_getname;
 164	int			trace_pgfaults;
 
 165	struct {
 166		struct ordered_events	data;
 167		u64			last;
 168	} oe;
 169};
 170
 171struct tp_field {
 172	int offset;
 173	union {
 174		u64 (*integer)(struct tp_field *field, struct perf_sample *sample);
 175		void *(*pointer)(struct tp_field *field, struct perf_sample *sample);
 176	};
 177};
 178
 179#define TP_UINT_FIELD(bits) \
 180static u64 tp_field__u##bits(struct tp_field *field, struct perf_sample *sample) \
 181{ \
 182	u##bits value; \
 183	memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
 184	return value;  \
 185}
 186
 187TP_UINT_FIELD(8);
 188TP_UINT_FIELD(16);
 189TP_UINT_FIELD(32);
 190TP_UINT_FIELD(64);
 191
 192#define TP_UINT_FIELD__SWAPPED(bits) \
 193static u64 tp_field__swapped_u##bits(struct tp_field *field, struct perf_sample *sample) \
 194{ \
 195	u##bits value; \
 196	memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
 197	return bswap_##bits(value);\
 198}
 199
 200TP_UINT_FIELD__SWAPPED(16);
 201TP_UINT_FIELD__SWAPPED(32);
 202TP_UINT_FIELD__SWAPPED(64);
 203
 204static int __tp_field__init_uint(struct tp_field *field, int size, int offset, bool needs_swap)
 205{
 206	field->offset = offset;
 207
 208	switch (size) {
 209	case 1:
 210		field->integer = tp_field__u8;
 211		break;
 212	case 2:
 213		field->integer = needs_swap ? tp_field__swapped_u16 : tp_field__u16;
 214		break;
 215	case 4:
 216		field->integer = needs_swap ? tp_field__swapped_u32 : tp_field__u32;
 217		break;
 218	case 8:
 219		field->integer = needs_swap ? tp_field__swapped_u64 : tp_field__u64;
 220		break;
 221	default:
 222		return -1;
 223	}
 224
 225	return 0;
 226}
 227
 228static int tp_field__init_uint(struct tp_field *field, struct tep_format_field *format_field, bool needs_swap)
 229{
 230	return __tp_field__init_uint(field, format_field->size, format_field->offset, needs_swap);
 231}
 232
 233static void *tp_field__ptr(struct tp_field *field, struct perf_sample *sample)
 234{
 235	return sample->raw_data + field->offset;
 236}
 237
 238static int __tp_field__init_ptr(struct tp_field *field, int offset)
 239{
 240	field->offset = offset;
 241	field->pointer = tp_field__ptr;
 242	return 0;
 243}
 244
 245static int tp_field__init_ptr(struct tp_field *field, struct tep_format_field *format_field)
 246{
 247	return __tp_field__init_ptr(field, format_field->offset);
 248}
 249
 250struct syscall_tp {
 251	struct tp_field id;
 252	union {
 253		struct tp_field args, ret;
 254	};
 255};
 256
 257static int perf_evsel__init_tp_uint_field(struct evsel *evsel,
 258					  struct tp_field *field,
 259					  const char *name)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 260{
 261	struct tep_format_field *format_field = perf_evsel__field(evsel, name);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 262
 263	if (format_field == NULL)
 264		return -1;
 265
 266	return tp_field__init_uint(field, format_field, evsel->needs_swap);
 267}
 268
 269#define perf_evsel__init_sc_tp_uint_field(evsel, name) \
 270	({ struct syscall_tp *sc = evsel->priv;\
 271	   perf_evsel__init_tp_uint_field(evsel, &sc->name, #name); })
 272
 273static int perf_evsel__init_tp_ptr_field(struct evsel *evsel,
 274					 struct tp_field *field,
 275					 const char *name)
 276{
 277	struct tep_format_field *format_field = perf_evsel__field(evsel, name);
 278
 279	if (format_field == NULL)
 280		return -1;
 281
 282	return tp_field__init_ptr(field, format_field);
 283}
 284
 285#define perf_evsel__init_sc_tp_ptr_field(evsel, name) \
 286	({ struct syscall_tp *sc = evsel->priv;\
 287	   perf_evsel__init_tp_ptr_field(evsel, &sc->name, #name); })
 288
 289static void evsel__delete_priv(struct evsel *evsel)
 290{
 291	zfree(&evsel->priv);
 292	evsel__delete(evsel);
 293}
 294
 295static int perf_evsel__init_syscall_tp(struct evsel *evsel)
 296{
 297	struct syscall_tp *sc = evsel->priv = malloc(sizeof(struct syscall_tp));
 298
 299	if (evsel->priv != NULL) {
 300		if (perf_evsel__init_tp_uint_field(evsel, &sc->id, "__syscall_nr") &&
 301		    perf_evsel__init_tp_uint_field(evsel, &sc->id, "nr"))
 302			goto out_delete;
 303		return 0;
 304	}
 305
 306	return -ENOMEM;
 307out_delete:
 308	zfree(&evsel->priv);
 309	return -ENOENT;
 310}
 311
 312static int perf_evsel__init_augmented_syscall_tp(struct evsel *evsel, struct evsel *tp)
 313{
 314	struct syscall_tp *sc = evsel->priv = malloc(sizeof(struct syscall_tp));
 315
 316	if (evsel->priv != NULL) {
 317		struct tep_format_field *syscall_id = perf_evsel__field(tp, "id");
 318		if (syscall_id == NULL)
 319			syscall_id = perf_evsel__field(tp, "__syscall_nr");
 320		if (syscall_id == NULL)
 321			goto out_delete;
 322		if (__tp_field__init_uint(&sc->id, syscall_id->size, syscall_id->offset, evsel->needs_swap))
 323			goto out_delete;
 324
 325		return 0;
 326	}
 327
 328	return -ENOMEM;
 329out_delete:
 330	zfree(&evsel->priv);
 331	return -EINVAL;
 332}
 333
 334static int perf_evsel__init_augmented_syscall_tp_args(struct evsel *evsel)
 335{
 336	struct syscall_tp *sc = evsel->priv;
 337
 338	return __tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64));
 339}
 340
 341static int perf_evsel__init_augmented_syscall_tp_ret(struct evsel *evsel)
 342{
 343	struct syscall_tp *sc = evsel->priv;
 344
 345	return __tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap);
 346}
 347
 348static int perf_evsel__init_raw_syscall_tp(struct evsel *evsel, void *handler)
 349{
 350	evsel->priv = malloc(sizeof(struct syscall_tp));
 351	if (evsel->priv != NULL) {
 352		if (perf_evsel__init_sc_tp_uint_field(evsel, id))
 353			goto out_delete;
 354
 355		evsel->handler = handler;
 356		return 0;
 357	}
 358
 359	return -ENOMEM;
 360
 361out_delete:
 362	zfree(&evsel->priv);
 363	return -ENOENT;
 364}
 365
 366static struct evsel *perf_evsel__raw_syscall_newtp(const char *direction, void *handler)
 367{
 368	struct evsel *evsel = perf_evsel__newtp("raw_syscalls", direction);
 369
 370	/* older kernel (e.g., RHEL6) use syscalls:{enter,exit} */
 371	if (IS_ERR(evsel))
 372		evsel = perf_evsel__newtp("syscalls", direction);
 373
 374	if (IS_ERR(evsel))
 375		return NULL;
 376
 377	if (perf_evsel__init_raw_syscall_tp(evsel, handler))
 378		goto out_delete;
 379
 380	return evsel;
 381
 382out_delete:
 383	evsel__delete_priv(evsel);
 384	return NULL;
 385}
 386
 387#define perf_evsel__sc_tp_uint(evsel, name, sample) \
 388	({ struct syscall_tp *fields = evsel->priv; \
 389	   fields->name.integer(&fields->name, sample); })
 390
 391#define perf_evsel__sc_tp_ptr(evsel, name, sample) \
 392	({ struct syscall_tp *fields = evsel->priv; \
 393	   fields->name.pointer(&fields->name, sample); })
 394
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 395size_t strarray__scnprintf(struct strarray *sa, char *bf, size_t size, const char *intfmt, bool show_prefix, int val)
 396{
 397	int idx = val - sa->offset;
 398
 399	if (idx < 0 || idx >= sa->nr_entries || sa->entries[idx] == NULL) {
 400		size_t printed = scnprintf(bf, size, intfmt, val);
 401		if (show_prefix)
 402			printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sa->prefix);
 403		return printed;
 404	}
 405
 406	return scnprintf(bf, size, "%s%s", show_prefix ? sa->prefix : "", sa->entries[idx]);
 407}
 408
 409static size_t __syscall_arg__scnprintf_strarray(char *bf, size_t size,
 410						const char *intfmt,
 411					        struct syscall_arg *arg)
 412{
 413	return strarray__scnprintf(arg->parm, bf, size, intfmt, arg->show_string_prefix, arg->val);
 414}
 415
 416static size_t syscall_arg__scnprintf_strarray(char *bf, size_t size,
 417					      struct syscall_arg *arg)
 418{
 419	return __syscall_arg__scnprintf_strarray(bf, size, "%d", arg);
 420}
 421
 422#define SCA_STRARRAY syscall_arg__scnprintf_strarray
 423
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 424size_t syscall_arg__scnprintf_strarray_flags(char *bf, size_t size, struct syscall_arg *arg)
 425{
 426	return strarray__scnprintf_flags(arg->parm, bf, size, arg->show_string_prefix, arg->val);
 427}
 428
 429size_t strarrays__scnprintf(struct strarrays *sas, char *bf, size_t size, const char *intfmt, bool show_prefix, int val)
 430{
 431	size_t printed;
 432	int i;
 433
 434	for (i = 0; i < sas->nr_entries; ++i) {
 435		struct strarray *sa = sas->entries[i];
 436		int idx = val - sa->offset;
 437
 438		if (idx >= 0 && idx < sa->nr_entries) {
 439			if (sa->entries[idx] == NULL)
 440				break;
 441			return scnprintf(bf, size, "%s%s", show_prefix ? sa->prefix : "", sa->entries[idx]);
 442		}
 443	}
 444
 445	printed = scnprintf(bf, size, intfmt, val);
 446	if (show_prefix)
 447		printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sas->entries[0]->prefix);
 448	return printed;
 449}
 450
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 451size_t syscall_arg__scnprintf_strarrays(char *bf, size_t size,
 452					struct syscall_arg *arg)
 453{
 454	return strarrays__scnprintf(arg->parm, bf, size, "%d", arg->show_string_prefix, arg->val);
 455}
 456
 457#ifndef AT_FDCWD
 458#define AT_FDCWD	-100
 459#endif
 460
 461static size_t syscall_arg__scnprintf_fd_at(char *bf, size_t size,
 462					   struct syscall_arg *arg)
 463{
 464	int fd = arg->val;
 465	const char *prefix = "AT_FD";
 466
 467	if (fd == AT_FDCWD)
 468		return scnprintf(bf, size, "%s%s", arg->show_string_prefix ? prefix : "", "CWD");
 469
 470	return syscall_arg__scnprintf_fd(bf, size, arg);
 471}
 472
 473#define SCA_FDAT syscall_arg__scnprintf_fd_at
 474
 475static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
 476					      struct syscall_arg *arg);
 477
 478#define SCA_CLOSE_FD syscall_arg__scnprintf_close_fd
 479
 480size_t syscall_arg__scnprintf_hex(char *bf, size_t size, struct syscall_arg *arg)
 481{
 482	return scnprintf(bf, size, "%#lx", arg->val);
 483}
 484
 485size_t syscall_arg__scnprintf_ptr(char *bf, size_t size, struct syscall_arg *arg)
 486{
 487	if (arg->val == 0)
 488		return scnprintf(bf, size, "NULL");
 489	return syscall_arg__scnprintf_hex(bf, size, arg);
 490}
 491
 492size_t syscall_arg__scnprintf_int(char *bf, size_t size, struct syscall_arg *arg)
 493{
 494	return scnprintf(bf, size, "%d", arg->val);
 495}
 496
 497size_t syscall_arg__scnprintf_long(char *bf, size_t size, struct syscall_arg *arg)
 498{
 499	return scnprintf(bf, size, "%ld", arg->val);
 500}
 501
 
 
 
 
 
 
 
 
 
 
 502static const char *bpf_cmd[] = {
 503	"MAP_CREATE", "MAP_LOOKUP_ELEM", "MAP_UPDATE_ELEM", "MAP_DELETE_ELEM",
 504	"MAP_GET_NEXT_KEY", "PROG_LOAD",
 505};
 506static DEFINE_STRARRAY(bpf_cmd, "BPF_");
 507
 508static const char *fsmount_flags[] = {
 509	[1] = "CLOEXEC",
 510};
 511static DEFINE_STRARRAY(fsmount_flags, "FSMOUNT_");
 512
 513#include "trace/beauty/generated/fsconfig_arrays.c"
 514
 515static DEFINE_STRARRAY(fsconfig_cmds, "FSCONFIG_");
 516
 517static const char *epoll_ctl_ops[] = { "ADD", "DEL", "MOD", };
 518static DEFINE_STRARRAY_OFFSET(epoll_ctl_ops, "EPOLL_CTL_", 1);
 519
 520static const char *itimers[] = { "REAL", "VIRTUAL", "PROF", };
 521static DEFINE_STRARRAY(itimers, "ITIMER_");
 522
 523static const char *keyctl_options[] = {
 524	"GET_KEYRING_ID", "JOIN_SESSION_KEYRING", "UPDATE", "REVOKE", "CHOWN",
 525	"SETPERM", "DESCRIBE", "CLEAR", "LINK", "UNLINK", "SEARCH", "READ",
 526	"INSTANTIATE", "NEGATE", "SET_REQKEY_KEYRING", "SET_TIMEOUT",
 527	"ASSUME_AUTHORITY", "GET_SECURITY", "SESSION_TO_PARENT", "REJECT",
 528	"INSTANTIATE_IOV", "INVALIDATE", "GET_PERSISTENT",
 529};
 530static DEFINE_STRARRAY(keyctl_options, "KEYCTL_");
 531
 532static const char *whences[] = { "SET", "CUR", "END",
 533#ifdef SEEK_DATA
 534"DATA",
 535#endif
 536#ifdef SEEK_HOLE
 537"HOLE",
 538#endif
 539};
 540static DEFINE_STRARRAY(whences, "SEEK_");
 541
 542static const char *fcntl_cmds[] = {
 543	"DUPFD", "GETFD", "SETFD", "GETFL", "SETFL", "GETLK", "SETLK",
 544	"SETLKW", "SETOWN", "GETOWN", "SETSIG", "GETSIG", "GETLK64",
 545	"SETLK64", "SETLKW64", "SETOWN_EX", "GETOWN_EX",
 546	"GETOWNER_UIDS",
 547};
 548static DEFINE_STRARRAY(fcntl_cmds, "F_");
 549
 550static const char *fcntl_linux_specific_cmds[] = {
 551	"SETLEASE", "GETLEASE", "NOTIFY", [5] =	"CANCELLK", "DUPFD_CLOEXEC",
 552	"SETPIPE_SZ", "GETPIPE_SZ", "ADD_SEALS", "GET_SEALS",
 553	"GET_RW_HINT", "SET_RW_HINT", "GET_FILE_RW_HINT", "SET_FILE_RW_HINT",
 554};
 555
 556static DEFINE_STRARRAY_OFFSET(fcntl_linux_specific_cmds, "F_", F_LINUX_SPECIFIC_BASE);
 557
 558static struct strarray *fcntl_cmds_arrays[] = {
 559	&strarray__fcntl_cmds,
 560	&strarray__fcntl_linux_specific_cmds,
 561};
 562
 563static DEFINE_STRARRAYS(fcntl_cmds_arrays);
 564
 565static const char *rlimit_resources[] = {
 566	"CPU", "FSIZE", "DATA", "STACK", "CORE", "RSS", "NPROC", "NOFILE",
 567	"MEMLOCK", "AS", "LOCKS", "SIGPENDING", "MSGQUEUE", "NICE", "RTPRIO",
 568	"RTTIME",
 569};
 570static DEFINE_STRARRAY(rlimit_resources, "RLIMIT_");
 571
 572static const char *sighow[] = { "BLOCK", "UNBLOCK", "SETMASK", };
 573static DEFINE_STRARRAY(sighow, "SIG_");
 574
 575static const char *clockid[] = {
 576	"REALTIME", "MONOTONIC", "PROCESS_CPUTIME_ID", "THREAD_CPUTIME_ID",
 577	"MONOTONIC_RAW", "REALTIME_COARSE", "MONOTONIC_COARSE", "BOOTTIME",
 578	"REALTIME_ALARM", "BOOTTIME_ALARM", "SGI_CYCLE", "TAI"
 579};
 580static DEFINE_STRARRAY(clockid, "CLOCK_");
 581
 582static size_t syscall_arg__scnprintf_access_mode(char *bf, size_t size,
 583						 struct syscall_arg *arg)
 584{
 585	bool show_prefix = arg->show_string_prefix;
 586	const char *suffix = "_OK";
 587	size_t printed = 0;
 588	int mode = arg->val;
 589
 590	if (mode == F_OK) /* 0 */
 591		return scnprintf(bf, size, "F%s", show_prefix ? suffix : "");
 592#define	P_MODE(n) \
 593	if (mode & n##_OK) { \
 594		printed += scnprintf(bf + printed, size - printed, "%s%s", #n, show_prefix ? suffix : ""); \
 595		mode &= ~n##_OK; \
 596	}
 597
 598	P_MODE(R);
 599	P_MODE(W);
 600	P_MODE(X);
 601#undef P_MODE
 602
 603	if (mode)
 604		printed += scnprintf(bf + printed, size - printed, "|%#x", mode);
 605
 606	return printed;
 607}
 608
 609#define SCA_ACCMODE syscall_arg__scnprintf_access_mode
 610
 611static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,
 612					      struct syscall_arg *arg);
 613
 614#define SCA_FILENAME syscall_arg__scnprintf_filename
 615
 616static size_t syscall_arg__scnprintf_pipe_flags(char *bf, size_t size,
 617						struct syscall_arg *arg)
 618{
 619	bool show_prefix = arg->show_string_prefix;
 620	const char *prefix = "O_";
 621	int printed = 0, flags = arg->val;
 622
 623#define	P_FLAG(n) \
 624	if (flags & O_##n) { \
 625		printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
 626		flags &= ~O_##n; \
 627	}
 628
 629	P_FLAG(CLOEXEC);
 630	P_FLAG(NONBLOCK);
 631#undef P_FLAG
 632
 633	if (flags)
 634		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
 635
 636	return printed;
 637}
 638
 639#define SCA_PIPE_FLAGS syscall_arg__scnprintf_pipe_flags
 640
 641#ifndef GRND_NONBLOCK
 642#define GRND_NONBLOCK	0x0001
 643#endif
 644#ifndef GRND_RANDOM
 645#define GRND_RANDOM	0x0002
 646#endif
 647
 648static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,
 649						   struct syscall_arg *arg)
 650{
 651	bool show_prefix = arg->show_string_prefix;
 652	const char *prefix = "GRND_";
 653	int printed = 0, flags = arg->val;
 654
 655#define	P_FLAG(n) \
 656	if (flags & GRND_##n) { \
 657		printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
 658		flags &= ~GRND_##n; \
 659	}
 660
 661	P_FLAG(RANDOM);
 662	P_FLAG(NONBLOCK);
 663#undef P_FLAG
 664
 665	if (flags)
 666		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
 667
 668	return printed;
 669}
 670
 671#define SCA_GETRANDOM_FLAGS syscall_arg__scnprintf_getrandom_flags
 672
 673#define STRARRAY(name, array) \
 674	  { .scnprintf	= SCA_STRARRAY, \
 
 675	    .parm	= &strarray__##array, }
 676
 677#define STRARRAY_FLAGS(name, array) \
 678	  { .scnprintf	= SCA_STRARRAY_FLAGS, \
 
 679	    .parm	= &strarray__##array, }
 680
 681#include "trace/beauty/arch_errno_names.c"
 682#include "trace/beauty/eventfd.c"
 683#include "trace/beauty/futex_op.c"
 684#include "trace/beauty/futex_val3.c"
 685#include "trace/beauty/mmap.c"
 686#include "trace/beauty/mode_t.c"
 687#include "trace/beauty/msg_flags.c"
 688#include "trace/beauty/open_flags.c"
 689#include "trace/beauty/perf_event_open.c"
 690#include "trace/beauty/pid.c"
 691#include "trace/beauty/sched_policy.c"
 692#include "trace/beauty/seccomp.c"
 693#include "trace/beauty/signum.c"
 694#include "trace/beauty/socket_type.c"
 695#include "trace/beauty/waitid_options.c"
 696
 697struct syscall_arg_fmt {
 698	size_t	   (*scnprintf)(char *bf, size_t size, struct syscall_arg *arg);
 699	unsigned long (*mask_val)(struct syscall_arg *arg, unsigned long val);
 700	void	   *parm;
 701	const char *name;
 702	bool	   show_zero;
 703};
 704
 705static struct syscall_fmt {
 706	const char *name;
 707	const char *alias;
 708	struct {
 709		const char *sys_enter,
 710			   *sys_exit;
 711	}	   bpf_prog_name;
 712	struct syscall_arg_fmt arg[6];
 713	u8	   nr_args;
 714	bool	   errpid;
 715	bool	   timeout;
 716	bool	   hexret;
 717} syscall_fmts[] = {
 718	{ .name	    = "access",
 719	  .arg = { [1] = { .scnprintf = SCA_ACCMODE,  /* mode */ }, }, },
 720	{ .name	    = "arch_prctl",
 721	  .arg = { [0] = { .scnprintf = SCA_X86_ARCH_PRCTL_CODE, /* code */ },
 722		   [1] = { .scnprintf = SCA_PTR, /* arg2 */ }, }, },
 723	{ .name	    = "bind",
 724	  .arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },
 725		   [1] = { .scnprintf = SCA_SOCKADDR, /* umyaddr */ },
 726		   [2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },
 727	{ .name	    = "bpf",
 728	  .arg = { [0] = STRARRAY(cmd, bpf_cmd), }, },
 729	{ .name	    = "brk",	    .hexret = true,
 730	  .arg = { [0] = { .scnprintf = SCA_PTR, /* brk */ }, }, },
 731	{ .name     = "clock_gettime",
 732	  .arg = { [0] = STRARRAY(clk_id, clockid), }, },
 733	{ .name	    = "clone",	    .errpid = true, .nr_args = 5,
 734	  .arg = { [0] = { .name = "flags",	    .scnprintf = SCA_CLONE_FLAGS, },
 735		   [1] = { .name = "child_stack",   .scnprintf = SCA_HEX, },
 736		   [2] = { .name = "parent_tidptr", .scnprintf = SCA_HEX, },
 737		   [3] = { .name = "child_tidptr",  .scnprintf = SCA_HEX, },
 738		   [4] = { .name = "tls",	    .scnprintf = SCA_HEX, }, }, },
 739	{ .name	    = "close",
 740	  .arg = { [0] = { .scnprintf = SCA_CLOSE_FD, /* fd */ }, }, },
 741	{ .name	    = "connect",
 742	  .arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },
 743		   [1] = { .scnprintf = SCA_SOCKADDR, /* servaddr */ },
 744		   [2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },
 745	{ .name	    = "epoll_ctl",
 746	  .arg = { [1] = STRARRAY(op, epoll_ctl_ops), }, },
 747	{ .name	    = "eventfd2",
 748	  .arg = { [1] = { .scnprintf = SCA_EFD_FLAGS, /* flags */ }, }, },
 749	{ .name	    = "fchmodat",
 750	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
 751	{ .name	    = "fchownat",
 752	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
 753	{ .name	    = "fcntl",
 754	  .arg = { [1] = { .scnprintf = SCA_FCNTL_CMD, /* cmd */
 
 755			   .parm      = &strarrays__fcntl_cmds_arrays,
 756			   .show_zero = true, },
 757		   [2] = { .scnprintf =  SCA_FCNTL_ARG, /* arg */ }, }, },
 758	{ .name	    = "flock",
 759	  .arg = { [1] = { .scnprintf = SCA_FLOCK, /* cmd */ }, }, },
 760	{ .name     = "fsconfig",
 761	  .arg = { [1] = STRARRAY(cmd, fsconfig_cmds), }, },
 762	{ .name     = "fsmount",
 763	  .arg = { [1] = STRARRAY_FLAGS(flags, fsmount_flags),
 764		   [2] = { .scnprintf = SCA_FSMOUNT_ATTR_FLAGS, /* attr_flags */ }, }, },
 765	{ .name     = "fspick",
 766	  .arg = { [0] = { .scnprintf = SCA_FDAT,	  /* dfd */ },
 767		   [1] = { .scnprintf = SCA_FILENAME,	  /* path */ },
 768		   [2] = { .scnprintf = SCA_FSPICK_FLAGS, /* flags */ }, }, },
 769	{ .name	    = "fstat", .alias = "newfstat", },
 770	{ .name	    = "fstatat", .alias = "newfstatat", },
 771	{ .name	    = "futex",
 772	  .arg = { [1] = { .scnprintf = SCA_FUTEX_OP, /* op */ },
 773		   [5] = { .scnprintf = SCA_FUTEX_VAL3, /* val3 */ }, }, },
 774	{ .name	    = "futimesat",
 775	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
 776	{ .name	    = "getitimer",
 777	  .arg = { [0] = STRARRAY(which, itimers), }, },
 778	{ .name	    = "getpid",	    .errpid = true, },
 779	{ .name	    = "getpgid",    .errpid = true, },
 780	{ .name	    = "getppid",    .errpid = true, },
 781	{ .name	    = "getrandom",
 782	  .arg = { [2] = { .scnprintf = SCA_GETRANDOM_FLAGS, /* flags */ }, }, },
 783	{ .name	    = "getrlimit",
 784	  .arg = { [0] = STRARRAY(resource, rlimit_resources), }, },
 785	{ .name	    = "gettid",	    .errpid = true, },
 786	{ .name	    = "ioctl",
 787	  .arg = {
 788#if defined(__i386__) || defined(__x86_64__)
 789/*
 790 * FIXME: Make this available to all arches.
 791 */
 792		   [1] = { .scnprintf = SCA_IOCTL_CMD, /* cmd */ },
 793		   [2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },
 794#else
 795		   [2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },
 796#endif
 797	{ .name	    = "kcmp",	    .nr_args = 5,
 798	  .arg = { [0] = { .name = "pid1",	.scnprintf = SCA_PID, },
 799		   [1] = { .name = "pid2",	.scnprintf = SCA_PID, },
 800		   [2] = { .name = "type",	.scnprintf = SCA_KCMP_TYPE, },
 801		   [3] = { .name = "idx1",	.scnprintf = SCA_KCMP_IDX, },
 802		   [4] = { .name = "idx2",	.scnprintf = SCA_KCMP_IDX, }, }, },
 803	{ .name	    = "keyctl",
 804	  .arg = { [0] = STRARRAY(option, keyctl_options), }, },
 805	{ .name	    = "kill",
 806	  .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
 807	{ .name	    = "linkat",
 808	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
 809	{ .name	    = "lseek",
 810	  .arg = { [2] = STRARRAY(whence, whences), }, },
 811	{ .name	    = "lstat", .alias = "newlstat", },
 812	{ .name     = "madvise",
 813	  .arg = { [0] = { .scnprintf = SCA_HEX,      /* start */ },
 814		   [2] = { .scnprintf = SCA_MADV_BHV, /* behavior */ }, }, },
 815	{ .name	    = "mkdirat",
 816	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
 817	{ .name	    = "mknodat",
 818	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
 819	{ .name	    = "mmap",	    .hexret = true,
 820/* The standard mmap maps to old_mmap on s390x */
 821#if defined(__s390x__)
 822	.alias = "old_mmap",
 823#endif
 824	  .arg = { [2] = { .scnprintf = SCA_MMAP_PROT,	/* prot */ },
 825		   [3] = { .scnprintf = SCA_MMAP_FLAGS,	/* flags */ },
 
 
 826		   [5] = { .scnprintf = SCA_HEX,	/* offset */ }, }, },
 827	{ .name	    = "mount",
 828	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* dev_name */ },
 829		   [3] = { .scnprintf = SCA_MOUNT_FLAGS, /* flags */
 830			   .mask_val  = SCAMV_MOUNT_FLAGS, /* flags */ }, }, },
 831	{ .name	    = "move_mount",
 832	  .arg = { [0] = { .scnprintf = SCA_FDAT,	/* from_dfd */ },
 833		   [1] = { .scnprintf = SCA_FILENAME, /* from_pathname */ },
 834		   [2] = { .scnprintf = SCA_FDAT,	/* to_dfd */ },
 835		   [3] = { .scnprintf = SCA_FILENAME, /* to_pathname */ },
 836		   [4] = { .scnprintf = SCA_MOVE_MOUNT_FLAGS, /* flags */ }, }, },
 837	{ .name	    = "mprotect",
 838	  .arg = { [0] = { .scnprintf = SCA_HEX,	/* start */ },
 839		   [2] = { .scnprintf = SCA_MMAP_PROT,	/* prot */ }, }, },
 840	{ .name	    = "mq_unlink",
 841	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* u_name */ }, }, },
 842	{ .name	    = "mremap",	    .hexret = true,
 843	  .arg = { [3] = { .scnprintf = SCA_MREMAP_FLAGS, /* flags */ }, }, },
 844	{ .name	    = "name_to_handle_at",
 845	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
 846	{ .name	    = "newfstatat",
 847	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
 848	{ .name	    = "open",
 849	  .arg = { [1] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
 850	{ .name	    = "open_by_handle_at",
 851	  .arg = { [0] = { .scnprintf = SCA_FDAT,	/* dfd */ },
 852		   [2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
 853	{ .name	    = "openat",
 854	  .arg = { [0] = { .scnprintf = SCA_FDAT,	/* dfd */ },
 855		   [2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
 856	{ .name	    = "perf_event_open",
 857	  .arg = { [2] = { .scnprintf = SCA_INT,	/* cpu */ },
 858		   [3] = { .scnprintf = SCA_FD,		/* group_fd */ },
 859		   [4] = { .scnprintf = SCA_PERF_FLAGS, /* flags */ }, }, },
 860	{ .name	    = "pipe2",
 861	  .arg = { [1] = { .scnprintf = SCA_PIPE_FLAGS, /* flags */ }, }, },
 862	{ .name	    = "pkey_alloc",
 863	  .arg = { [1] = { .scnprintf = SCA_PKEY_ALLOC_ACCESS_RIGHTS,	/* access_rights */ }, }, },
 864	{ .name	    = "pkey_free",
 865	  .arg = { [0] = { .scnprintf = SCA_INT,	/* key */ }, }, },
 866	{ .name	    = "pkey_mprotect",
 867	  .arg = { [0] = { .scnprintf = SCA_HEX,	/* start */ },
 868		   [2] = { .scnprintf = SCA_MMAP_PROT,	/* prot */ },
 869		   [3] = { .scnprintf = SCA_INT,	/* pkey */ }, }, },
 870	{ .name	    = "poll", .timeout = true, },
 871	{ .name	    = "ppoll", .timeout = true, },
 872	{ .name	    = "prctl",
 873	  .arg = { [0] = { .scnprintf = SCA_PRCTL_OPTION, /* option */ },
 
 
 874		   [1] = { .scnprintf = SCA_PRCTL_ARG2, /* arg2 */ },
 875		   [2] = { .scnprintf = SCA_PRCTL_ARG3, /* arg3 */ }, }, },
 876	{ .name	    = "pread", .alias = "pread64", },
 877	{ .name	    = "preadv", .alias = "pread", },
 878	{ .name	    = "prlimit64",
 879	  .arg = { [1] = STRARRAY(resource, rlimit_resources), }, },
 880	{ .name	    = "pwrite", .alias = "pwrite64", },
 881	{ .name	    = "readlinkat",
 882	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
 883	{ .name	    = "recvfrom",
 884	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
 885	{ .name	    = "recvmmsg",
 886	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
 887	{ .name	    = "recvmsg",
 888	  .arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
 889	{ .name	    = "renameat",
 890	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },
 891		   [2] = { .scnprintf = SCA_FDAT, /* newdirfd */ }, }, },
 892	{ .name	    = "renameat2",
 893	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },
 894		   [2] = { .scnprintf = SCA_FDAT, /* newdirfd */ },
 895		   [4] = { .scnprintf = SCA_RENAMEAT2_FLAGS, /* flags */ }, }, },
 896	{ .name	    = "rt_sigaction",
 897	  .arg = { [0] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
 898	{ .name	    = "rt_sigprocmask",
 899	  .arg = { [0] = STRARRAY(how, sighow), }, },
 900	{ .name	    = "rt_sigqueueinfo",
 901	  .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
 902	{ .name	    = "rt_tgsigqueueinfo",
 903	  .arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
 904	{ .name	    = "sched_setscheduler",
 905	  .arg = { [1] = { .scnprintf = SCA_SCHED_POLICY, /* policy */ }, }, },
 906	{ .name	    = "seccomp",
 907	  .arg = { [0] = { .scnprintf = SCA_SECCOMP_OP,	   /* op */ },
 908		   [1] = { .scnprintf = SCA_SECCOMP_FLAGS, /* flags */ }, }, },
 909	{ .name	    = "select", .timeout = true, },
 910	{ .name	    = "sendfile", .alias = "sendfile64", },
 911	{ .name	    = "sendmmsg",
 912	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
 913	{ .name	    = "sendmsg",
 914	  .arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
 915	{ .name	    = "sendto",
 916	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ },
 917		   [4] = { .scnprintf = SCA_SOCKADDR, /* addr */ }, }, },
 918	{ .name	    = "set_tid_address", .errpid = true, },
 919	{ .name	    = "setitimer",
 920	  .arg = { [0] = STRARRAY(which, itimers), }, },
 921	{ .name	    = "setrlimit",
 922	  .arg = { [0] = STRARRAY(resource, rlimit_resources), }, },
 923	{ .name	    = "socket",
 924	  .arg = { [0] = STRARRAY(family, socket_families),
 925		   [1] = { .scnprintf = SCA_SK_TYPE, /* type */ },
 926		   [2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },
 927	{ .name	    = "socketpair",
 928	  .arg = { [0] = STRARRAY(family, socket_families),
 929		   [1] = { .scnprintf = SCA_SK_TYPE, /* type */ },
 930		   [2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },
 931	{ .name	    = "stat", .alias = "newstat", },
 932	{ .name	    = "statx",
 933	  .arg = { [0] = { .scnprintf = SCA_FDAT,	 /* fdat */ },
 934		   [2] = { .scnprintf = SCA_STATX_FLAGS, /* flags */ } ,
 935		   [3] = { .scnprintf = SCA_STATX_MASK,	 /* mask */ }, }, },
 936	{ .name	    = "swapoff",
 937	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* specialfile */ }, }, },
 938	{ .name	    = "swapon",
 939	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* specialfile */ }, }, },
 940	{ .name	    = "symlinkat",
 941	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
 942	{ .name	    = "sync_file_range",
 943	  .arg = { [3] = { .scnprintf = SCA_SYNC_FILE_RANGE_FLAGS, /* flags */ }, }, },
 944	{ .name	    = "tgkill",
 945	  .arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
 946	{ .name	    = "tkill",
 947	  .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
 948	{ .name     = "umount2", .alias = "umount",
 949	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* name */ }, }, },
 950	{ .name	    = "uname", .alias = "newuname", },
 951	{ .name	    = "unlinkat",
 952	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
 953	{ .name	    = "utimensat",
 954	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ }, }, },
 955	{ .name	    = "wait4",	    .errpid = true,
 956	  .arg = { [2] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },
 957	{ .name	    = "waitid",	    .errpid = true,
 958	  .arg = { [3] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },
 959};
 960
 961static int syscall_fmt__cmp(const void *name, const void *fmtp)
 962{
 963	const struct syscall_fmt *fmt = fmtp;
 964	return strcmp(name, fmt->name);
 965}
 966
 
 
 
 
 
 967static struct syscall_fmt *syscall_fmt__find(const char *name)
 968{
 969	const int nmemb = ARRAY_SIZE(syscall_fmts);
 970	return bsearch(name, syscall_fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
 971}
 972
 973static struct syscall_fmt *syscall_fmt__find_by_alias(const char *alias)
 974{
 975	int i, nmemb = ARRAY_SIZE(syscall_fmts);
 976
 977	for (i = 0; i < nmemb; ++i) {
 978		if (syscall_fmts[i].alias && strcmp(syscall_fmts[i].alias, alias) == 0)
 979			return &syscall_fmts[i];
 980	}
 981
 982	return NULL;
 983}
 984
 
 
 
 
 
 
 985/*
 986 * is_exit: is this "exit" or "exit_group"?
 987 * is_open: is this "open" or "openat"? To associate the fd returned in sys_exit with the pathname in sys_enter.
 988 * args_size: sum of the sizes of the syscall arguments, anything after that is augmented stuff: pathname for openat, etc.
 989 * nonexistent: Just a hole in the syscall table, syscall id not allocated
 990 */
 991struct syscall {
 992	struct tep_event    *tp_format;
 993	int		    nr_args;
 994	int		    args_size;
 995	struct {
 996		struct bpf_program *sys_enter,
 997				   *sys_exit;
 998	}		    bpf_prog;
 999	bool		    is_exit;
1000	bool		    is_open;
1001	bool		    nonexistent;
1002	struct tep_format_field *args;
1003	const char	    *name;
1004	struct syscall_fmt  *fmt;
1005	struct syscall_arg_fmt *arg_fmt;
1006};
1007
1008/*
1009 * Must match what is in the BPF program:
1010 *
1011 * tools/perf/examples/bpf/augmented_raw_syscalls.c
1012 */
1013struct bpf_map_syscall_entry {
1014	bool	enabled;
1015	u16	string_args_len[6];
1016};
1017
1018/*
1019 * We need to have this 'calculated' boolean because in some cases we really
1020 * don't know what is the duration of a syscall, for instance, when we start
1021 * a session and some threads are waiting for a syscall to finish, say 'poll',
1022 * in which case all we can do is to print "( ? ) for duration and for the
1023 * start timestamp.
1024 */
1025static size_t fprintf_duration(unsigned long t, bool calculated, FILE *fp)
1026{
1027	double duration = (double)t / NSEC_PER_MSEC;
1028	size_t printed = fprintf(fp, "(");
1029
1030	if (!calculated)
1031		printed += fprintf(fp, "         ");
1032	else if (duration >= 1.0)
1033		printed += color_fprintf(fp, PERF_COLOR_RED, "%6.3f ms", duration);
1034	else if (duration >= 0.01)
1035		printed += color_fprintf(fp, PERF_COLOR_YELLOW, "%6.3f ms", duration);
1036	else
1037		printed += color_fprintf(fp, PERF_COLOR_NORMAL, "%6.3f ms", duration);
1038	return printed + fprintf(fp, "): ");
1039}
1040
1041/**
1042 * filename.ptr: The filename char pointer that will be vfs_getname'd
1043 * filename.entry_str_pos: Where to insert the string translated from
1044 *                         filename.ptr by the vfs_getname tracepoint/kprobe.
1045 * ret_scnprintf: syscall args may set this to a different syscall return
1046 *                formatter, for instance, fcntl may return fds, file flags, etc.
1047 */
1048struct thread_trace {
1049	u64		  entry_time;
1050	bool		  entry_pending;
1051	unsigned long	  nr_events;
1052	unsigned long	  pfmaj, pfmin;
1053	char		  *entry_str;
1054	double		  runtime_ms;
1055	size_t		  (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg);
1056        struct {
1057		unsigned long ptr;
1058		short int     entry_str_pos;
1059		bool	      pending_open;
1060		unsigned int  namelen;
1061		char	      *name;
1062	} filename;
1063	struct {
1064		int	      max;
1065		struct file   *table;
1066	} files;
1067
1068	struct intlist *syscall_stats;
1069};
1070
1071static struct thread_trace *thread_trace__new(void)
1072{
1073	struct thread_trace *ttrace =  zalloc(sizeof(struct thread_trace));
1074
1075	if (ttrace) {
1076		ttrace->files.max = -1;
1077		ttrace->syscall_stats = intlist__new(NULL);
1078	}
1079
1080	return ttrace;
1081}
1082
1083static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)
1084{
1085	struct thread_trace *ttrace;
1086
1087	if (thread == NULL)
1088		goto fail;
1089
1090	if (thread__priv(thread) == NULL)
1091		thread__set_priv(thread, thread_trace__new());
1092
1093	if (thread__priv(thread) == NULL)
1094		goto fail;
1095
1096	ttrace = thread__priv(thread);
1097	++ttrace->nr_events;
1098
1099	return ttrace;
1100fail:
1101	color_fprintf(fp, PERF_COLOR_RED,
1102		      "WARNING: not enough memory, dropping samples!\n");
1103	return NULL;
1104}
1105
1106
1107void syscall_arg__set_ret_scnprintf(struct syscall_arg *arg,
1108				    size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg))
1109{
1110	struct thread_trace *ttrace = thread__priv(arg->thread);
1111
1112	ttrace->ret_scnprintf = ret_scnprintf;
1113}
1114
1115#define TRACE_PFMAJ		(1 << 0)
1116#define TRACE_PFMIN		(1 << 1)
1117
1118static const size_t trace__entry_str_size = 2048;
1119
1120static struct file *thread_trace__files_entry(struct thread_trace *ttrace, int fd)
1121{
1122	if (fd < 0)
1123		return NULL;
1124
1125	if (fd > ttrace->files.max) {
1126		struct file *nfiles = realloc(ttrace->files.table, (fd + 1) * sizeof(struct file));
1127
1128		if (nfiles == NULL)
1129			return NULL;
1130
1131		if (ttrace->files.max != -1) {
1132			memset(nfiles + ttrace->files.max + 1, 0,
1133			       (fd - ttrace->files.max) * sizeof(struct file));
1134		} else {
1135			memset(nfiles, 0, (fd + 1) * sizeof(struct file));
1136		}
1137
1138		ttrace->files.table = nfiles;
1139		ttrace->files.max   = fd;
1140	}
1141
1142	return ttrace->files.table + fd;
1143}
1144
1145struct file *thread__files_entry(struct thread *thread, int fd)
1146{
1147	return thread_trace__files_entry(thread__priv(thread), fd);
1148}
1149
1150static int trace__set_fd_pathname(struct thread *thread, int fd, const char *pathname)
1151{
1152	struct thread_trace *ttrace = thread__priv(thread);
1153	struct file *file = thread_trace__files_entry(ttrace, fd);
1154
1155	if (file != NULL) {
1156		struct stat st;
1157		if (stat(pathname, &st) == 0)
1158			file->dev_maj = major(st.st_rdev);
1159		file->pathname = strdup(pathname);
1160		if (file->pathname)
1161			return 0;
1162	}
1163
1164	return -1;
1165}
1166
1167static int thread__read_fd_path(struct thread *thread, int fd)
1168{
1169	char linkname[PATH_MAX], pathname[PATH_MAX];
1170	struct stat st;
1171	int ret;
1172
1173	if (thread->pid_ == thread->tid) {
1174		scnprintf(linkname, sizeof(linkname),
1175			  "/proc/%d/fd/%d", thread->pid_, fd);
1176	} else {
1177		scnprintf(linkname, sizeof(linkname),
1178			  "/proc/%d/task/%d/fd/%d", thread->pid_, thread->tid, fd);
1179	}
1180
1181	if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
1182		return -1;
1183
1184	ret = readlink(linkname, pathname, sizeof(pathname));
1185
1186	if (ret < 0 || ret > st.st_size)
1187		return -1;
1188
1189	pathname[ret] = '\0';
1190	return trace__set_fd_pathname(thread, fd, pathname);
1191}
1192
1193static const char *thread__fd_path(struct thread *thread, int fd,
1194				   struct trace *trace)
1195{
1196	struct thread_trace *ttrace = thread__priv(thread);
1197
1198	if (ttrace == NULL || trace->fd_path_disabled)
1199		return NULL;
1200
1201	if (fd < 0)
1202		return NULL;
1203
1204	if ((fd > ttrace->files.max || ttrace->files.table[fd].pathname == NULL)) {
1205		if (!trace->live)
1206			return NULL;
1207		++trace->stats.proc_getname;
1208		if (thread__read_fd_path(thread, fd))
1209			return NULL;
1210	}
1211
1212	return ttrace->files.table[fd].pathname;
1213}
1214
1215size_t syscall_arg__scnprintf_fd(char *bf, size_t size, struct syscall_arg *arg)
1216{
1217	int fd = arg->val;
1218	size_t printed = scnprintf(bf, size, "%d", fd);
1219	const char *path = thread__fd_path(arg->thread, fd, arg->trace);
1220
1221	if (path)
1222		printed += scnprintf(bf + printed, size - printed, "<%s>", path);
1223
1224	return printed;
1225}
1226
1227size_t pid__scnprintf_fd(struct trace *trace, pid_t pid, int fd, char *bf, size_t size)
1228{
1229        size_t printed = scnprintf(bf, size, "%d", fd);
1230	struct thread *thread = machine__find_thread(trace->host, pid, pid);
1231
1232	if (thread) {
1233		const char *path = thread__fd_path(thread, fd, trace);
1234
1235		if (path)
1236			printed += scnprintf(bf + printed, size - printed, "<%s>", path);
1237
1238		thread__put(thread);
1239	}
1240
1241        return printed;
1242}
1243
1244static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
1245					      struct syscall_arg *arg)
1246{
1247	int fd = arg->val;
1248	size_t printed = syscall_arg__scnprintf_fd(bf, size, arg);
1249	struct thread_trace *ttrace = thread__priv(arg->thread);
1250
1251	if (ttrace && fd >= 0 && fd <= ttrace->files.max)
1252		zfree(&ttrace->files.table[fd].pathname);
1253
1254	return printed;
1255}
1256
1257static void thread__set_filename_pos(struct thread *thread, const char *bf,
1258				     unsigned long ptr)
1259{
1260	struct thread_trace *ttrace = thread__priv(thread);
1261
1262	ttrace->filename.ptr = ptr;
1263	ttrace->filename.entry_str_pos = bf - ttrace->entry_str;
1264}
1265
1266static size_t syscall_arg__scnprintf_augmented_string(struct syscall_arg *arg, char *bf, size_t size)
1267{
1268	struct augmented_arg *augmented_arg = arg->augmented.args;
1269	size_t printed = scnprintf(bf, size, "\"%.*s\"", augmented_arg->size, augmented_arg->value);
1270	/*
1271	 * So that the next arg with a payload can consume its augmented arg, i.e. for rename* syscalls
1272	 * we would have two strings, each prefixed by its size.
1273	 */
1274	int consumed = sizeof(*augmented_arg) + augmented_arg->size;
1275
1276	arg->augmented.args = ((void *)arg->augmented.args) + consumed;
1277	arg->augmented.size -= consumed;
1278
1279	return printed;
1280}
1281
1282static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,
1283					      struct syscall_arg *arg)
1284{
1285	unsigned long ptr = arg->val;
1286
1287	if (arg->augmented.args)
1288		return syscall_arg__scnprintf_augmented_string(arg, bf, size);
1289
1290	if (!arg->trace->vfs_getname)
1291		return scnprintf(bf, size, "%#x", ptr);
1292
1293	thread__set_filename_pos(arg->thread, bf, ptr);
1294	return 0;
1295}
1296
1297static bool trace__filter_duration(struct trace *trace, double t)
1298{
1299	return t < (trace->duration_filter * NSEC_PER_MSEC);
1300}
1301
1302static size_t __trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
1303{
1304	double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;
1305
1306	return fprintf(fp, "%10.3f ", ts);
1307}
1308
1309/*
1310 * We're handling tstamp=0 as an undefined tstamp, i.e. like when we are
1311 * using ttrace->entry_time for a thread that receives a sys_exit without
1312 * first having received a sys_enter ("poll" issued before tracing session
1313 * starts, lost sys_enter exit due to ring buffer overflow).
1314 */
1315static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
1316{
1317	if (tstamp > 0)
1318		return __trace__fprintf_tstamp(trace, tstamp, fp);
1319
1320	return fprintf(fp, "         ? ");
1321}
1322
1323static bool done = false;
1324static bool interrupted = false;
1325
1326static void sig_handler(int sig)
1327{
1328	done = true;
1329	interrupted = sig == SIGINT;
1330}
1331
1332static size_t trace__fprintf_comm_tid(struct trace *trace, struct thread *thread, FILE *fp)
1333{
1334	size_t printed = 0;
1335
1336	if (trace->multiple_threads) {
1337		if (trace->show_comm)
1338			printed += fprintf(fp, "%.14s/", thread__comm_str(thread));
1339		printed += fprintf(fp, "%d ", thread->tid);
1340	}
1341
1342	return printed;
1343}
1344
1345static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
1346					u64 duration, bool duration_calculated, u64 tstamp, FILE *fp)
1347{
1348	size_t printed = 0;
1349
1350	if (trace->show_tstamp)
1351		printed = trace__fprintf_tstamp(trace, tstamp, fp);
1352	if (trace->show_duration)
1353		printed += fprintf_duration(duration, duration_calculated, fp);
1354	return printed + trace__fprintf_comm_tid(trace, thread, fp);
1355}
1356
1357static int trace__process_event(struct trace *trace, struct machine *machine,
1358				union perf_event *event, struct perf_sample *sample)
1359{
1360	int ret = 0;
1361
1362	switch (event->header.type) {
1363	case PERF_RECORD_LOST:
1364		color_fprintf(trace->output, PERF_COLOR_RED,
1365			      "LOST %" PRIu64 " events!\n", event->lost.lost);
1366		ret = machine__process_lost_event(machine, event, sample);
1367		break;
1368	default:
1369		ret = machine__process_event(machine, event, sample);
1370		break;
1371	}
1372
1373	return ret;
1374}
1375
1376static int trace__tool_process(struct perf_tool *tool,
1377			       union perf_event *event,
1378			       struct perf_sample *sample,
1379			       struct machine *machine)
1380{
1381	struct trace *trace = container_of(tool, struct trace, tool);
1382	return trace__process_event(trace, machine, event, sample);
1383}
1384
1385static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
1386{
1387	struct machine *machine = vmachine;
1388
1389	if (machine->kptr_restrict_warned)
1390		return NULL;
1391
1392	if (symbol_conf.kptr_restrict) {
1393		pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
1394			   "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
1395			   "Kernel samples will not be resolved.\n");
1396		machine->kptr_restrict_warned = true;
1397		return NULL;
1398	}
1399
1400	return machine__resolve_kernel_addr(vmachine, addrp, modp);
1401}
1402
1403static int trace__symbols_init(struct trace *trace, struct evlist *evlist)
1404{
1405	int err = symbol__init(NULL);
1406
1407	if (err)
1408		return err;
1409
1410	trace->host = machine__new_host();
1411	if (trace->host == NULL)
1412		return -ENOMEM;
1413
1414	err = trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr);
1415	if (err < 0)
1416		goto out;
1417
1418	err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
1419					    evlist->core.threads, trace__tool_process, false,
1420					    1);
1421out:
1422	if (err)
1423		symbol__exit();
1424
1425	return err;
1426}
1427
1428static void trace__symbols__exit(struct trace *trace)
1429{
1430	machine__exit(trace->host);
1431	trace->host = NULL;
1432
1433	symbol__exit();
1434}
1435
1436static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)
1437{
1438	int idx;
1439
1440	if (nr_args == 6 && sc->fmt && sc->fmt->nr_args != 0)
1441		nr_args = sc->fmt->nr_args;
1442
1443	sc->arg_fmt = calloc(nr_args, sizeof(*sc->arg_fmt));
1444	if (sc->arg_fmt == NULL)
1445		return -1;
1446
1447	for (idx = 0; idx < nr_args; ++idx) {
1448		if (sc->fmt)
1449			sc->arg_fmt[idx] = sc->fmt->arg[idx];
1450	}
1451
1452	sc->nr_args = nr_args;
1453	return 0;
1454}
1455
1456static int syscall__set_arg_fmts(struct syscall *sc)
 
 
 
 
 
1457{
1458	struct tep_format_field *field, *last_field = NULL;
1459	int idx = 0, len;
 
1460
1461	for (field = sc->args; field; field = field->next, ++idx) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1462		last_field = field;
1463
1464		if (sc->fmt && sc->fmt->arg[idx].scnprintf)
1465			continue;
1466
1467		len = strlen(field->name);
1468
1469		if (strcmp(field->type, "const char *") == 0 &&
1470		    ((len >= 4 && strcmp(field->name + len - 4, "name") == 0) ||
1471		     strstr(field->name, "path") != NULL))
1472			sc->arg_fmt[idx].scnprintf = SCA_FILENAME;
1473		else if ((field->flags & TEP_FIELD_IS_POINTER) || strstr(field->name, "addr"))
1474			sc->arg_fmt[idx].scnprintf = SCA_PTR;
1475		else if (strcmp(field->type, "pid_t") == 0)
1476			sc->arg_fmt[idx].scnprintf = SCA_PID;
1477		else if (strcmp(field->type, "umode_t") == 0)
1478			sc->arg_fmt[idx].scnprintf = SCA_MODE_T;
1479		else if ((strcmp(field->type, "int") == 0 ||
 
 
 
1480			  strcmp(field->type, "unsigned int") == 0 ||
1481			  strcmp(field->type, "long") == 0) &&
1482			 len >= 2 && strcmp(field->name + len - 2, "fd") == 0) {
1483			/*
1484			 * /sys/kernel/tracing/events/syscalls/sys_enter*
1485			 * egrep 'field:.*fd;' .../format|sed -r 's/.*field:([a-z ]+) [a-z_]*fd.+/\1/g'|sort|uniq -c
1486			 * 65 int
1487			 * 23 unsigned int
1488			 * 7 unsigned long
1489			 */
1490			sc->arg_fmt[idx].scnprintf = SCA_FD;
 
 
 
 
 
 
 
1491		}
1492	}
1493
 
 
 
 
 
 
 
1494	if (last_field)
1495		sc->args_size = last_field->offset + last_field->size;
1496
1497	return 0;
1498}
1499
1500static int trace__read_syscall_info(struct trace *trace, int id)
1501{
1502	char tp_name[128];
1503	struct syscall *sc;
1504	const char *name = syscalltbl__name(trace->sctbl, id);
1505
 
1506	if (trace->syscalls.table == NULL) {
1507		trace->syscalls.table = calloc(trace->sctbl->syscalls.max_id + 1, sizeof(*sc));
1508		if (trace->syscalls.table == NULL)
1509			return -ENOMEM;
1510	}
 
 
 
 
 
 
 
 
 
1511
 
 
 
 
1512	sc = trace->syscalls.table + id;
1513	if (sc->nonexistent)
1514		return 0;
1515
1516	if (name == NULL) {
1517		sc->nonexistent = true;
1518		return 0;
1519	}
1520
1521	sc->name = name;
1522	sc->fmt  = syscall_fmt__find(sc->name);
1523
1524	snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
1525	sc->tp_format = trace_event__tp_format("syscalls", tp_name);
1526
1527	if (IS_ERR(sc->tp_format) && sc->fmt && sc->fmt->alias) {
1528		snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
1529		sc->tp_format = trace_event__tp_format("syscalls", tp_name);
1530	}
1531
1532	if (syscall__alloc_arg_fmts(sc, IS_ERR(sc->tp_format) ? 6 : sc->tp_format->format.nr_fields))
1533		return -ENOMEM;
1534
1535	if (IS_ERR(sc->tp_format))
1536		return PTR_ERR(sc->tp_format);
1537
1538	sc->args = sc->tp_format->format.fields;
1539	/*
1540	 * We need to check and discard the first variable '__syscall_nr'
1541	 * or 'nr' that mean the syscall number. It is needless here.
1542	 * So drop '__syscall_nr' or 'nr' field but does not exist on older kernels.
1543	 */
1544	if (sc->args && (!strcmp(sc->args->name, "__syscall_nr") || !strcmp(sc->args->name, "nr"))) {
1545		sc->args = sc->args->next;
1546		--sc->nr_args;
1547	}
1548
1549	sc->is_exit = !strcmp(name, "exit_group") || !strcmp(name, "exit");
1550	sc->is_open = !strcmp(name, "open") || !strcmp(name, "openat");
1551
1552	return syscall__set_arg_fmts(sc);
1553}
1554
 
 
 
 
 
 
 
 
 
 
 
 
1555static int intcmp(const void *a, const void *b)
1556{
1557	const int *one = a, *another = b;
1558
1559	return *one - *another;
1560}
1561
1562static int trace__validate_ev_qualifier(struct trace *trace)
1563{
1564	int err = 0;
1565	bool printed_invalid_prefix = false;
1566	struct str_node *pos;
1567	size_t nr_used = 0, nr_allocated = strlist__nr_entries(trace->ev_qualifier);
1568
1569	trace->ev_qualifier_ids.entries = malloc(nr_allocated *
1570						 sizeof(trace->ev_qualifier_ids.entries[0]));
1571
1572	if (trace->ev_qualifier_ids.entries == NULL) {
1573		fputs("Error:\tNot enough memory for allocating events qualifier ids\n",
1574		       trace->output);
1575		err = -EINVAL;
1576		goto out;
1577	}
1578
1579	strlist__for_each_entry(pos, trace->ev_qualifier) {
1580		const char *sc = pos->s;
1581		int id = syscalltbl__id(trace->sctbl, sc), match_next = -1;
1582
1583		if (id < 0) {
1584			id = syscalltbl__strglobmatch_first(trace->sctbl, sc, &match_next);
1585			if (id >= 0)
1586				goto matches;
1587
1588			if (!printed_invalid_prefix) {
1589				pr_debug("Skipping unknown syscalls: ");
1590				printed_invalid_prefix = true;
1591			} else {
1592				pr_debug(", ");
1593			}
1594
1595			pr_debug("%s", sc);
1596			continue;
1597		}
1598matches:
1599		trace->ev_qualifier_ids.entries[nr_used++] = id;
1600		if (match_next == -1)
1601			continue;
1602
1603		while (1) {
1604			id = syscalltbl__strglobmatch_next(trace->sctbl, sc, &match_next);
1605			if (id < 0)
1606				break;
1607			if (nr_allocated == nr_used) {
1608				void *entries;
1609
1610				nr_allocated += 8;
1611				entries = realloc(trace->ev_qualifier_ids.entries,
1612						  nr_allocated * sizeof(trace->ev_qualifier_ids.entries[0]));
1613				if (entries == NULL) {
1614					err = -ENOMEM;
1615					fputs("\nError:\t Not enough memory for parsing\n", trace->output);
1616					goto out_free;
1617				}
1618				trace->ev_qualifier_ids.entries = entries;
1619			}
1620			trace->ev_qualifier_ids.entries[nr_used++] = id;
1621		}
1622	}
1623
1624	trace->ev_qualifier_ids.nr = nr_used;
1625	qsort(trace->ev_qualifier_ids.entries, nr_used, sizeof(int), intcmp);
1626out:
1627	if (printed_invalid_prefix)
1628		pr_debug("\n");
1629	return err;
1630out_free:
1631	zfree(&trace->ev_qualifier_ids.entries);
1632	trace->ev_qualifier_ids.nr = 0;
1633	goto out;
1634}
1635
1636static __maybe_unused bool trace__syscall_enabled(struct trace *trace, int id)
1637{
1638	bool in_ev_qualifier;
1639
1640	if (trace->ev_qualifier_ids.nr == 0)
1641		return true;
1642
1643	in_ev_qualifier = bsearch(&id, trace->ev_qualifier_ids.entries,
1644				  trace->ev_qualifier_ids.nr, sizeof(int), intcmp) != NULL;
1645
1646	if (in_ev_qualifier)
1647	       return !trace->not_ev_qualifier;
1648
1649	return trace->not_ev_qualifier;
1650}
1651
1652/*
1653 * args is to be interpreted as a series of longs but we need to handle
1654 * 8-byte unaligned accesses. args points to raw_data within the event
1655 * and raw_data is guaranteed to be 8-byte unaligned because it is
1656 * preceded by raw_size which is a u32. So we need to copy args to a temp
1657 * variable to read it. Most notably this avoids extended load instructions
1658 * on unaligned addresses
1659 */
1660unsigned long syscall_arg__val(struct syscall_arg *arg, u8 idx)
1661{
1662	unsigned long val;
1663	unsigned char *p = arg->args + sizeof(unsigned long) * idx;
1664
1665	memcpy(&val, p, sizeof(val));
1666	return val;
1667}
1668
1669static size_t syscall__scnprintf_name(struct syscall *sc, char *bf, size_t size,
1670				      struct syscall_arg *arg)
1671{
1672	if (sc->arg_fmt && sc->arg_fmt[arg->idx].name)
1673		return scnprintf(bf, size, "%s: ", sc->arg_fmt[arg->idx].name);
1674
1675	return scnprintf(bf, size, "arg%d: ", arg->idx);
1676}
1677
1678/*
1679 * Check if the value is in fact zero, i.e. mask whatever needs masking, such
1680 * as mount 'flags' argument that needs ignoring some magic flag, see comment
1681 * in tools/perf/trace/beauty/mount_flags.c
1682 */
1683static unsigned long syscall__mask_val(struct syscall *sc, struct syscall_arg *arg, unsigned long val)
1684{
1685	if (sc->arg_fmt && sc->arg_fmt[arg->idx].mask_val)
1686		return sc->arg_fmt[arg->idx].mask_val(arg, val);
1687
1688	return val;
1689}
1690
1691static size_t syscall__scnprintf_val(struct syscall *sc, char *bf, size_t size,
1692				     struct syscall_arg *arg, unsigned long val)
1693{
1694	if (sc->arg_fmt && sc->arg_fmt[arg->idx].scnprintf) {
1695		arg->val = val;
1696		if (sc->arg_fmt[arg->idx].parm)
1697			arg->parm = sc->arg_fmt[arg->idx].parm;
1698		return sc->arg_fmt[arg->idx].scnprintf(bf, size, arg);
1699	}
1700	return scnprintf(bf, size, "%ld", val);
1701}
1702
1703static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
1704				      unsigned char *args, void *augmented_args, int augmented_args_size,
1705				      struct trace *trace, struct thread *thread)
1706{
1707	size_t printed = 0;
1708	unsigned long val;
1709	u8 bit = 1;
1710	struct syscall_arg arg = {
1711		.args	= args,
1712		.augmented = {
1713			.size = augmented_args_size,
1714			.args = augmented_args,
1715		},
1716		.idx	= 0,
1717		.mask	= 0,
1718		.trace  = trace,
1719		.thread = thread,
1720		.show_string_prefix = trace->show_string_prefix,
1721	};
1722	struct thread_trace *ttrace = thread__priv(thread);
1723
1724	/*
1725	 * Things like fcntl will set this in its 'cmd' formatter to pick the
1726	 * right formatter for the return value (an fd? file flags?), which is
1727	 * not needed for syscalls that always return a given type, say an fd.
1728	 */
1729	ttrace->ret_scnprintf = NULL;
1730
1731	if (sc->args != NULL) {
1732		struct tep_format_field *field;
1733
1734		for (field = sc->args; field;
1735		     field = field->next, ++arg.idx, bit <<= 1) {
1736			if (arg.mask & bit)
1737				continue;
1738
 
1739			val = syscall_arg__val(&arg, arg.idx);
1740			/*
1741			 * Some syscall args need some mask, most don't and
1742			 * return val untouched.
1743			 */
1744			val = syscall__mask_val(sc, &arg, val);
1745
1746			/*
1747 			 * Suppress this argument if its value is zero and
1748 			 * and we don't have a string associated in an
1749 			 * strarray for it.
1750 			 */
1751			if (val == 0 &&
1752			    !trace->show_zeros &&
1753			    !(sc->arg_fmt &&
1754			      (sc->arg_fmt[arg.idx].show_zero ||
1755			       sc->arg_fmt[arg.idx].scnprintf == SCA_STRARRAY ||
1756			       sc->arg_fmt[arg.idx].scnprintf == SCA_STRARRAYS) &&
1757			      sc->arg_fmt[arg.idx].parm))
1758				continue;
1759
1760			printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");
1761
1762			if (trace->show_arg_names)
1763				printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);
1764
1765			printed += syscall__scnprintf_val(sc, bf + printed, size - printed, &arg, val);
 
1766		}
1767	} else if (IS_ERR(sc->tp_format)) {
1768		/*
1769		 * If we managed to read the tracepoint /format file, then we
1770		 * may end up not having any args, like with gettid(), so only
1771		 * print the raw args when we didn't manage to read it.
1772		 */
1773		while (arg.idx < sc->nr_args) {
1774			if (arg.mask & bit)
1775				goto next_arg;
1776			val = syscall_arg__val(&arg, arg.idx);
1777			if (printed)
1778				printed += scnprintf(bf + printed, size - printed, ", ");
1779			printed += syscall__scnprintf_name(sc, bf + printed, size - printed, &arg);
1780			printed += syscall__scnprintf_val(sc, bf + printed, size - printed, &arg, val);
1781next_arg:
1782			++arg.idx;
1783			bit <<= 1;
1784		}
1785	}
1786
1787	return printed;
1788}
1789
1790typedef int (*tracepoint_handler)(struct trace *trace, struct evsel *evsel,
1791				  union perf_event *event,
1792				  struct perf_sample *sample);
1793
1794static struct syscall *trace__syscall_info(struct trace *trace,
1795					   struct evsel *evsel, int id)
1796{
1797	int err = 0;
1798
1799	if (id < 0) {
1800
1801		/*
1802		 * XXX: Noticed on x86_64, reproduced as far back as 3.0.36, haven't tried
1803		 * before that, leaving at a higher verbosity level till that is
1804		 * explained. Reproduced with plain ftrace with:
1805		 *
1806		 * echo 1 > /t/events/raw_syscalls/sys_exit/enable
1807		 * grep "NR -1 " /t/trace_pipe
1808		 *
1809		 * After generating some load on the machine.
1810 		 */
1811		if (verbose > 1) {
1812			static u64 n;
1813			fprintf(trace->output, "Invalid syscall %d id, skipping (%s, %" PRIu64 ") ...\n",
1814				id, perf_evsel__name(evsel), ++n);
1815		}
1816		return NULL;
1817	}
1818
1819	err = -EINVAL;
1820
1821	if (id > trace->sctbl->syscalls.max_id)
 
 
 
 
 
 
 
 
 
 
 
1822		goto out_cant_read;
 
1823
1824	if ((trace->syscalls.table == NULL || trace->syscalls.table[id].name == NULL) &&
1825	    (err = trace__read_syscall_info(trace, id)) != 0)
1826		goto out_cant_read;
1827
1828	if (trace->syscalls.table[id].name == NULL) {
1829		if (trace->syscalls.table[id].nonexistent)
1830			return NULL;
1831		goto out_cant_read;
1832	}
1833
1834	return &trace->syscalls.table[id];
1835
1836out_cant_read:
1837	if (verbose > 0) {
1838		char sbuf[STRERR_BUFSIZE];
1839		fprintf(trace->output, "Problems reading syscall %d: %d (%s)", id, -err, str_error_r(-err, sbuf, sizeof(sbuf)));
1840		if (id <= trace->sctbl->syscalls.max_id && trace->syscalls.table[id].name != NULL)
1841			fprintf(trace->output, "(%s)", trace->syscalls.table[id].name);
1842		fputs(" information\n", trace->output);
1843	}
1844	return NULL;
1845}
1846
1847static void thread__update_stats(struct thread_trace *ttrace,
1848				 int id, struct perf_sample *sample)
 
 
 
 
 
 
 
1849{
1850	struct int_node *inode;
1851	struct stats *stats;
1852	u64 duration = 0;
1853
1854	inode = intlist__findnew(ttrace->syscall_stats, id);
1855	if (inode == NULL)
1856		return;
1857
1858	stats = inode->priv;
1859	if (stats == NULL) {
1860		stats = malloc(sizeof(struct stats));
1861		if (stats == NULL)
1862			return;
1863		init_stats(stats);
 
 
 
 
1864		inode->priv = stats;
1865	}
1866
1867	if (ttrace->entry_time && sample->time > ttrace->entry_time)
1868		duration = sample->time - ttrace->entry_time;
1869
1870	update_stats(stats, duration);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1871}
1872
1873static int trace__printf_interrupted_entry(struct trace *trace)
1874{
1875	struct thread_trace *ttrace;
1876	size_t printed;
1877	int len;
1878
1879	if (trace->failure_only || trace->current == NULL)
1880		return 0;
1881
1882	ttrace = thread__priv(trace->current);
1883
1884	if (!ttrace->entry_pending)
1885		return 0;
1886
1887	printed  = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output);
1888	printed += len = fprintf(trace->output, "%s)", ttrace->entry_str);
1889
1890	if (len < trace->args_alignment - 4)
1891		printed += fprintf(trace->output, "%-*s", trace->args_alignment - 4 - len, " ");
1892
1893	printed += fprintf(trace->output, " ...\n");
1894
1895	ttrace->entry_pending = false;
1896	++trace->nr_events_printed;
1897
1898	return printed;
1899}
1900
1901static int trace__fprintf_sample(struct trace *trace, struct evsel *evsel,
1902				 struct perf_sample *sample, struct thread *thread)
1903{
1904	int printed = 0;
1905
1906	if (trace->print_sample) {
1907		double ts = (double)sample->time / NSEC_PER_MSEC;
1908
1909		printed += fprintf(trace->output, "%22s %10.3f %s %d/%d [%d]\n",
1910				   perf_evsel__name(evsel), ts,
1911				   thread__comm_str(thread),
1912				   sample->pid, sample->tid, sample->cpu);
1913	}
1914
1915	return printed;
1916}
1917
1918static void *syscall__augmented_args(struct syscall *sc, struct perf_sample *sample, int *augmented_args_size, int raw_augmented_args_size)
1919{
1920	void *augmented_args = NULL;
1921	/*
1922	 * For now with BPF raw_augmented we hook into raw_syscalls:sys_enter
1923	 * and there we get all 6 syscall args plus the tracepoint common fields
1924	 * that gets calculated at the start and the syscall_nr (another long).
1925	 * So we check if that is the case and if so don't look after the
1926	 * sc->args_size but always after the full raw_syscalls:sys_enter payload,
1927	 * which is fixed.
1928	 *
1929	 * We'll revisit this later to pass s->args_size to the BPF augmenter
1930	 * (now tools/perf/examples/bpf/augmented_raw_syscalls.c, so that it
1931	 * copies only what we need for each syscall, like what happens when we
1932	 * use syscalls:sys_enter_NAME, so that we reduce the kernel/userspace
1933	 * traffic to just what is needed for each syscall.
1934	 */
1935	int args_size = raw_augmented_args_size ?: sc->args_size;
1936
1937	*augmented_args_size = sample->raw_size - args_size;
1938	if (*augmented_args_size > 0)
1939		augmented_args = sample->raw_data + args_size;
1940
1941	return augmented_args;
1942}
1943
1944static int trace__sys_enter(struct trace *trace, struct evsel *evsel,
1945			    union perf_event *event __maybe_unused,
1946			    struct perf_sample *sample)
1947{
1948	char *msg;
1949	void *args;
1950	int printed = 0;
1951	struct thread *thread;
1952	int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;
1953	int augmented_args_size = 0;
1954	void *augmented_args = NULL;
1955	struct syscall *sc = trace__syscall_info(trace, evsel, id);
1956	struct thread_trace *ttrace;
1957
1958	if (sc == NULL)
1959		return -1;
1960
1961	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
1962	ttrace = thread__trace(thread, trace->output);
1963	if (ttrace == NULL)
1964		goto out_put;
1965
1966	trace__fprintf_sample(trace, evsel, sample, thread);
1967
1968	args = perf_evsel__sc_tp_ptr(evsel, args, sample);
1969
1970	if (ttrace->entry_str == NULL) {
1971		ttrace->entry_str = malloc(trace__entry_str_size);
1972		if (!ttrace->entry_str)
1973			goto out_put;
1974	}
1975
1976	if (!(trace->duration_filter || trace->summary_only || trace->min_stack))
1977		trace__printf_interrupted_entry(trace);
1978	/*
1979	 * If this is raw_syscalls.sys_enter, then it always comes with the 6 possible
1980	 * arguments, even if the syscall being handled, say "openat", uses only 4 arguments
1981	 * this breaks syscall__augmented_args() check for augmented args, as we calculate
1982	 * syscall->args_size using each syscalls:sys_enter_NAME tracefs format file,
1983	 * so when handling, say the openat syscall, we end up getting 6 args for the
1984	 * raw_syscalls:sys_enter event, when we expected just 4, we end up mistakenly
1985	 * thinking that the extra 2 u64 args are the augmented filename, so just check
1986	 * here and avoid using augmented syscalls when the evsel is the raw_syscalls one.
1987	 */
1988	if (evsel != trace->syscalls.events.sys_enter)
1989		augmented_args = syscall__augmented_args(sc, sample, &augmented_args_size, trace->raw_augmented_syscalls_args_size);
1990	ttrace->entry_time = sample->time;
1991	msg = ttrace->entry_str;
1992	printed += scnprintf(msg + printed, trace__entry_str_size - printed, "%s(", sc->name);
1993
1994	printed += syscall__scnprintf_args(sc, msg + printed, trace__entry_str_size - printed,
1995					   args, augmented_args, augmented_args_size, trace, thread);
1996
1997	if (sc->is_exit) {
1998		if (!(trace->duration_filter || trace->summary_only || trace->failure_only || trace->min_stack)) {
1999			int alignment = 0;
2000
2001			trace__fprintf_entry_head(trace, thread, 0, false, ttrace->entry_time, trace->output);
2002			printed = fprintf(trace->output, "%s)", ttrace->entry_str);
2003			if (trace->args_alignment > printed)
2004				alignment = trace->args_alignment - printed;
2005			fprintf(trace->output, "%*s= ?\n", alignment, " ");
2006		}
2007	} else {
2008		ttrace->entry_pending = true;
2009		/* See trace__vfs_getname & trace__sys_exit */
2010		ttrace->filename.pending_open = false;
2011	}
2012
2013	if (trace->current != thread) {
2014		thread__put(trace->current);
2015		trace->current = thread__get(thread);
2016	}
2017	err = 0;
2018out_put:
2019	thread__put(thread);
2020	return err;
2021}
2022
2023static int trace__fprintf_sys_enter(struct trace *trace, struct evsel *evsel,
2024				    struct perf_sample *sample)
2025{
2026	struct thread_trace *ttrace;
2027	struct thread *thread;
2028	int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;
2029	struct syscall *sc = trace__syscall_info(trace, evsel, id);
2030	char msg[1024];
2031	void *args, *augmented_args = NULL;
2032	int augmented_args_size;
2033
2034	if (sc == NULL)
2035		return -1;
2036
2037	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2038	ttrace = thread__trace(thread, trace->output);
2039	/*
2040	 * We need to get ttrace just to make sure it is there when syscall__scnprintf_args()
2041	 * and the rest of the beautifiers accessing it via struct syscall_arg touches it.
2042	 */
2043	if (ttrace == NULL)
2044		goto out_put;
2045
2046	args = perf_evsel__sc_tp_ptr(evsel, args, sample);
2047	augmented_args = syscall__augmented_args(sc, sample, &augmented_args_size, trace->raw_augmented_syscalls_args_size);
2048	syscall__scnprintf_args(sc, msg, sizeof(msg), args, augmented_args, augmented_args_size, trace, thread);
2049	fprintf(trace->output, "%s", msg);
2050	err = 0;
2051out_put:
2052	thread__put(thread);
2053	return err;
2054}
2055
2056static int trace__resolve_callchain(struct trace *trace, struct evsel *evsel,
2057				    struct perf_sample *sample,
2058				    struct callchain_cursor *cursor)
2059{
2060	struct addr_location al;
2061	int max_stack = evsel->core.attr.sample_max_stack ?
2062			evsel->core.attr.sample_max_stack :
2063			trace->max_stack;
2064	int err;
2065
2066	if (machine__resolve(trace->host, &al, sample) < 0)
2067		return -1;
2068
2069	err = thread__resolve_callchain(al.thread, cursor, evsel, sample, NULL, NULL, max_stack);
2070	addr_location__put(&al);
2071	return err;
2072}
2073
2074static int trace__fprintf_callchain(struct trace *trace, struct perf_sample *sample)
2075{
2076	/* TODO: user-configurable print_opts */
2077	const unsigned int print_opts = EVSEL__PRINT_SYM |
2078				        EVSEL__PRINT_DSO |
2079				        EVSEL__PRINT_UNKNOWN_AS_ADDR;
2080
2081	return sample__fprintf_callchain(sample, 38, print_opts, &callchain_cursor, symbol_conf.bt_stop_list, trace->output);
2082}
2083
2084static const char *errno_to_name(struct evsel *evsel, int err)
2085{
2086	struct perf_env *env = perf_evsel__env(evsel);
2087	const char *arch_name = perf_env__arch(env);
2088
2089	return arch_syscalls__strerrno(arch_name, err);
2090}
2091
2092static int trace__sys_exit(struct trace *trace, struct evsel *evsel,
2093			   union perf_event *event __maybe_unused,
2094			   struct perf_sample *sample)
2095{
2096	long ret;
2097	u64 duration = 0;
2098	bool duration_calculated = false;
2099	struct thread *thread;
2100	int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1, callchain_ret = 0, printed = 0;
2101	int alignment = trace->args_alignment;
2102	struct syscall *sc = trace__syscall_info(trace, evsel, id);
2103	struct thread_trace *ttrace;
2104
2105	if (sc == NULL)
2106		return -1;
2107
2108	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2109	ttrace = thread__trace(thread, trace->output);
2110	if (ttrace == NULL)
2111		goto out_put;
2112
2113	trace__fprintf_sample(trace, evsel, sample, thread);
2114
2115	if (trace->summary)
2116		thread__update_stats(ttrace, id, sample);
2117
2118	ret = perf_evsel__sc_tp_uint(evsel, ret, sample);
2119
 
 
 
2120	if (!trace->fd_path_disabled && sc->is_open && ret >= 0 && ttrace->filename.pending_open) {
2121		trace__set_fd_pathname(thread, ret, ttrace->filename.name);
2122		ttrace->filename.pending_open = false;
2123		++trace->stats.vfs_getname;
2124	}
2125
2126	if (ttrace->entry_time) {
2127		duration = sample->time - ttrace->entry_time;
2128		if (trace__filter_duration(trace, duration))
2129			goto out;
2130		duration_calculated = true;
2131	} else if (trace->duration_filter)
2132		goto out;
2133
2134	if (sample->callchain) {
2135		callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
2136		if (callchain_ret == 0) {
2137			if (callchain_cursor.nr < trace->min_stack)
2138				goto out;
2139			callchain_ret = 1;
2140		}
2141	}
2142
2143	if (trace->summary_only || (ret >= 0 && trace->failure_only))
2144		goto out;
2145
2146	trace__fprintf_entry_head(trace, thread, duration, duration_calculated, ttrace->entry_time, trace->output);
2147
2148	if (ttrace->entry_pending) {
2149		printed = fprintf(trace->output, "%s", ttrace->entry_str);
2150	} else {
2151		printed += fprintf(trace->output, " ... [");
2152		color_fprintf(trace->output, PERF_COLOR_YELLOW, "continued");
2153		printed += 9;
2154		printed += fprintf(trace->output, "]: %s()", sc->name);
2155	}
2156
2157	printed++; /* the closing ')' */
2158
2159	if (alignment > printed)
2160		alignment -= printed;
2161	else
2162		alignment = 0;
2163
2164	fprintf(trace->output, ")%*s= ", alignment, " ");
2165
2166	if (sc->fmt == NULL) {
2167		if (ret < 0)
2168			goto errno_print;
2169signed_print:
2170		fprintf(trace->output, "%ld", ret);
2171	} else if (ret < 0) {
2172errno_print: {
2173		char bf[STRERR_BUFSIZE];
2174		const char *emsg = str_error_r(-ret, bf, sizeof(bf)),
2175			   *e = errno_to_name(evsel, -ret);
2176
2177		fprintf(trace->output, "-1 %s (%s)", e, emsg);
2178	}
2179	} else if (ret == 0 && sc->fmt->timeout)
2180		fprintf(trace->output, "0 (Timeout)");
2181	else if (ttrace->ret_scnprintf) {
2182		char bf[1024];
2183		struct syscall_arg arg = {
2184			.val	= ret,
2185			.thread	= thread,
2186			.trace	= trace,
2187		};
2188		ttrace->ret_scnprintf(bf, sizeof(bf), &arg);
2189		ttrace->ret_scnprintf = NULL;
2190		fprintf(trace->output, "%s", bf);
2191	} else if (sc->fmt->hexret)
2192		fprintf(trace->output, "%#lx", ret);
2193	else if (sc->fmt->errpid) {
2194		struct thread *child = machine__find_thread(trace->host, ret, ret);
2195
2196		if (child != NULL) {
2197			fprintf(trace->output, "%ld", ret);
2198			if (child->comm_set)
2199				fprintf(trace->output, " (%s)", thread__comm_str(child));
2200			thread__put(child);
2201		}
2202	} else
2203		goto signed_print;
2204
2205	fputc('\n', trace->output);
2206
2207	/*
2208	 * We only consider an 'event' for the sake of --max-events a non-filtered
2209	 * sys_enter + sys_exit and other tracepoint events.
2210	 */
2211	if (++trace->nr_events_printed == trace->max_events && trace->max_events != ULONG_MAX)
2212		interrupted = true;
2213
2214	if (callchain_ret > 0)
2215		trace__fprintf_callchain(trace, sample);
2216	else if (callchain_ret < 0)
2217		pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
2218out:
2219	ttrace->entry_pending = false;
2220	err = 0;
2221out_put:
2222	thread__put(thread);
2223	return err;
2224}
2225
2226static int trace__vfs_getname(struct trace *trace, struct evsel *evsel,
2227			      union perf_event *event __maybe_unused,
2228			      struct perf_sample *sample)
2229{
2230	struct thread *thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2231	struct thread_trace *ttrace;
2232	size_t filename_len, entry_str_len, to_move;
2233	ssize_t remaining_space;
2234	char *pos;
2235	const char *filename = perf_evsel__rawptr(evsel, sample, "pathname");
2236
2237	if (!thread)
2238		goto out;
2239
2240	ttrace = thread__priv(thread);
2241	if (!ttrace)
2242		goto out_put;
2243
2244	filename_len = strlen(filename);
2245	if (filename_len == 0)
2246		goto out_put;
2247
2248	if (ttrace->filename.namelen < filename_len) {
2249		char *f = realloc(ttrace->filename.name, filename_len + 1);
2250
2251		if (f == NULL)
2252			goto out_put;
2253
2254		ttrace->filename.namelen = filename_len;
2255		ttrace->filename.name = f;
2256	}
2257
2258	strcpy(ttrace->filename.name, filename);
2259	ttrace->filename.pending_open = true;
2260
2261	if (!ttrace->filename.ptr)
2262		goto out_put;
2263
2264	entry_str_len = strlen(ttrace->entry_str);
2265	remaining_space = trace__entry_str_size - entry_str_len - 1; /* \0 */
2266	if (remaining_space <= 0)
2267		goto out_put;
2268
2269	if (filename_len > (size_t)remaining_space) {
2270		filename += filename_len - remaining_space;
2271		filename_len = remaining_space;
2272	}
2273
2274	to_move = entry_str_len - ttrace->filename.entry_str_pos + 1; /* \0 */
2275	pos = ttrace->entry_str + ttrace->filename.entry_str_pos;
2276	memmove(pos + filename_len, pos, to_move);
2277	memcpy(pos, filename, filename_len);
2278
2279	ttrace->filename.ptr = 0;
2280	ttrace->filename.entry_str_pos = 0;
2281out_put:
2282	thread__put(thread);
2283out:
2284	return 0;
2285}
2286
2287static int trace__sched_stat_runtime(struct trace *trace, struct evsel *evsel,
2288				     union perf_event *event __maybe_unused,
2289				     struct perf_sample *sample)
2290{
2291        u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
2292	double runtime_ms = (double)runtime / NSEC_PER_MSEC;
2293	struct thread *thread = machine__findnew_thread(trace->host,
2294							sample->pid,
2295							sample->tid);
2296	struct thread_trace *ttrace = thread__trace(thread, trace->output);
2297
2298	if (ttrace == NULL)
2299		goto out_dump;
2300
2301	ttrace->runtime_ms += runtime_ms;
2302	trace->runtime_ms += runtime_ms;
2303out_put:
2304	thread__put(thread);
2305	return 0;
2306
2307out_dump:
2308	fprintf(trace->output, "%s: comm=%s,pid=%u,runtime=%" PRIu64 ",vruntime=%" PRIu64 ")\n",
2309	       evsel->name,
2310	       perf_evsel__strval(evsel, sample, "comm"),
2311	       (pid_t)perf_evsel__intval(evsel, sample, "pid"),
2312	       runtime,
2313	       perf_evsel__intval(evsel, sample, "vruntime"));
2314	goto out_put;
2315}
2316
2317static int bpf_output__printer(enum binary_printer_ops op,
2318			       unsigned int val, void *extra __maybe_unused, FILE *fp)
2319{
2320	unsigned char ch = (unsigned char)val;
2321
2322	switch (op) {
2323	case BINARY_PRINT_CHAR_DATA:
2324		return fprintf(fp, "%c", isprint(ch) ? ch : '.');
2325	case BINARY_PRINT_DATA_BEGIN:
2326	case BINARY_PRINT_LINE_BEGIN:
2327	case BINARY_PRINT_ADDR:
2328	case BINARY_PRINT_NUM_DATA:
2329	case BINARY_PRINT_NUM_PAD:
2330	case BINARY_PRINT_SEP:
2331	case BINARY_PRINT_CHAR_PAD:
2332	case BINARY_PRINT_LINE_END:
2333	case BINARY_PRINT_DATA_END:
2334	default:
2335		break;
2336	}
2337
2338	return 0;
2339}
2340
2341static void bpf_output__fprintf(struct trace *trace,
2342				struct perf_sample *sample)
2343{
2344	binary__fprintf(sample->raw_data, sample->raw_size, 8,
2345			bpf_output__printer, NULL, trace->output);
2346	++trace->nr_events_printed;
2347}
2348
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2349static int trace__event_handler(struct trace *trace, struct evsel *evsel,
2350				union perf_event *event __maybe_unused,
2351				struct perf_sample *sample)
2352{
2353	struct thread *thread;
2354	int callchain_ret = 0;
2355	/*
2356	 * Check if we called perf_evsel__disable(evsel) due to, for instance,
2357	 * this event's max_events having been hit and this is an entry coming
2358	 * from the ring buffer that we should discard, since the max events
2359	 * have already been considered/printed.
2360	 */
2361	if (evsel->disabled)
2362		return 0;
2363
2364	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2365
2366	if (sample->callchain) {
2367		callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
2368		if (callchain_ret == 0) {
2369			if (callchain_cursor.nr < trace->min_stack)
2370				goto out;
2371			callchain_ret = 1;
2372		}
2373	}
2374
2375	trace__printf_interrupted_entry(trace);
2376	trace__fprintf_tstamp(trace, sample->time, trace->output);
2377
2378	if (trace->trace_syscalls && trace->show_duration)
2379		fprintf(trace->output, "(         ): ");
2380
2381	if (thread)
2382		trace__fprintf_comm_tid(trace, thread, trace->output);
2383
2384	if (evsel == trace->syscalls.events.augmented) {
2385		int id = perf_evsel__sc_tp_uint(evsel, id, sample);
2386		struct syscall *sc = trace__syscall_info(trace, evsel, id);
2387
2388		if (sc) {
2389			fprintf(trace->output, "%s(", sc->name);
2390			trace__fprintf_sys_enter(trace, evsel, sample);
2391			fputc(')', trace->output);
2392			goto newline;
2393		}
2394
2395		/*
2396		 * XXX: Not having the associated syscall info or not finding/adding
2397		 * 	the thread should never happen, but if it does...
2398		 * 	fall thru and print it as a bpf_output event.
2399		 */
2400	}
2401
2402	fprintf(trace->output, "%s:", evsel->name);
2403
2404	if (perf_evsel__is_bpf_output(evsel)) {
2405		bpf_output__fprintf(trace, sample);
2406	} else if (evsel->tp_format) {
2407		if (strncmp(evsel->tp_format->name, "sys_enter_", 10) ||
2408		    trace__fprintf_sys_enter(trace, evsel, sample)) {
2409			event_format__fprintf(evsel->tp_format, sample->cpu,
2410					      sample->raw_data, sample->raw_size,
2411					      trace->output);
2412			++trace->nr_events_printed;
2413
2414			if (evsel->max_events != ULONG_MAX && ++evsel->nr_events_printed == evsel->max_events) {
2415				evsel__disable(evsel);
2416				evsel__close(evsel);
2417			}
2418		}
2419	}
2420
2421newline:
2422	fprintf(trace->output, "\n");
2423
2424	if (callchain_ret > 0)
2425		trace__fprintf_callchain(trace, sample);
2426	else if (callchain_ret < 0)
2427		pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
 
 
 
 
 
 
 
2428out:
2429	thread__put(thread);
2430	return 0;
2431}
2432
2433static void print_location(FILE *f, struct perf_sample *sample,
2434			   struct addr_location *al,
2435			   bool print_dso, bool print_sym)
2436{
2437
2438	if ((verbose > 0 || print_dso) && al->map)
2439		fprintf(f, "%s@", al->map->dso->long_name);
2440
2441	if ((verbose > 0 || print_sym) && al->sym)
2442		fprintf(f, "%s+0x%" PRIx64, al->sym->name,
2443			al->addr - al->sym->start);
2444	else if (al->map)
2445		fprintf(f, "0x%" PRIx64, al->addr);
2446	else
2447		fprintf(f, "0x%" PRIx64, sample->addr);
2448}
2449
2450static int trace__pgfault(struct trace *trace,
2451			  struct evsel *evsel,
2452			  union perf_event *event __maybe_unused,
2453			  struct perf_sample *sample)
2454{
2455	struct thread *thread;
2456	struct addr_location al;
2457	char map_type = 'd';
2458	struct thread_trace *ttrace;
2459	int err = -1;
2460	int callchain_ret = 0;
2461
2462	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2463
2464	if (sample->callchain) {
2465		callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
2466		if (callchain_ret == 0) {
2467			if (callchain_cursor.nr < trace->min_stack)
2468				goto out_put;
2469			callchain_ret = 1;
2470		}
2471	}
2472
2473	ttrace = thread__trace(thread, trace->output);
2474	if (ttrace == NULL)
2475		goto out_put;
2476
2477	if (evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ)
2478		ttrace->pfmaj++;
2479	else
2480		ttrace->pfmin++;
2481
2482	if (trace->summary_only)
2483		goto out;
2484
2485	thread__find_symbol(thread, sample->cpumode, sample->ip, &al);
2486
2487	trace__fprintf_entry_head(trace, thread, 0, true, sample->time, trace->output);
2488
2489	fprintf(trace->output, "%sfault [",
2490		evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ?
2491		"maj" : "min");
2492
2493	print_location(trace->output, sample, &al, false, true);
2494
2495	fprintf(trace->output, "] => ");
2496
2497	thread__find_symbol(thread, sample->cpumode, sample->addr, &al);
2498
2499	if (!al.map) {
2500		thread__find_symbol(thread, sample->cpumode, sample->addr, &al);
2501
2502		if (al.map)
2503			map_type = 'x';
2504		else
2505			map_type = '?';
2506	}
2507
2508	print_location(trace->output, sample, &al, true, false);
2509
2510	fprintf(trace->output, " (%c%c)\n", map_type, al.level);
2511
2512	if (callchain_ret > 0)
2513		trace__fprintf_callchain(trace, sample);
2514	else if (callchain_ret < 0)
2515		pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
2516
2517	++trace->nr_events_printed;
2518out:
2519	err = 0;
2520out_put:
2521	thread__put(thread);
2522	return err;
2523}
2524
2525static void trace__set_base_time(struct trace *trace,
2526				 struct evsel *evsel,
2527				 struct perf_sample *sample)
2528{
2529	/*
2530	 * BPF events were not setting PERF_SAMPLE_TIME, so be more robust
2531	 * and don't use sample->time unconditionally, we may end up having
2532	 * some other event in the future without PERF_SAMPLE_TIME for good
2533	 * reason, i.e. we may not be interested in its timestamps, just in
2534	 * it taking place, picking some piece of information when it
2535	 * appears in our event stream (vfs_getname comes to mind).
2536	 */
2537	if (trace->base_time == 0 && !trace->full_time &&
2538	    (evsel->core.attr.sample_type & PERF_SAMPLE_TIME))
2539		trace->base_time = sample->time;
2540}
2541
2542static int trace__process_sample(struct perf_tool *tool,
2543				 union perf_event *event,
2544				 struct perf_sample *sample,
2545				 struct evsel *evsel,
2546				 struct machine *machine __maybe_unused)
2547{
2548	struct trace *trace = container_of(tool, struct trace, tool);
2549	struct thread *thread;
2550	int err = 0;
2551
2552	tracepoint_handler handler = evsel->handler;
2553
2554	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2555	if (thread && thread__is_filtered(thread))
2556		goto out;
2557
2558	trace__set_base_time(trace, evsel, sample);
2559
2560	if (handler) {
2561		++trace->nr_events;
2562		handler(trace, evsel, event, sample);
2563	}
2564out:
2565	thread__put(thread);
2566	return err;
2567}
2568
2569static int trace__record(struct trace *trace, int argc, const char **argv)
2570{
2571	unsigned int rec_argc, i, j;
2572	const char **rec_argv;
2573	const char * const record_args[] = {
2574		"record",
2575		"-R",
2576		"-m", "1024",
2577		"-c", "1",
2578	};
2579
 
2580	const char * const sc_args[] = { "-e", };
2581	unsigned int sc_args_nr = ARRAY_SIZE(sc_args);
2582	const char * const majpf_args[] = { "-e", "major-faults" };
2583	unsigned int majpf_args_nr = ARRAY_SIZE(majpf_args);
2584	const char * const minpf_args[] = { "-e", "minor-faults" };
2585	unsigned int minpf_args_nr = ARRAY_SIZE(minpf_args);
 
2586
2587	/* +1 is for the event string below */
2588	rec_argc = ARRAY_SIZE(record_args) + sc_args_nr + 1 +
2589		majpf_args_nr + minpf_args_nr + argc;
2590	rec_argv = calloc(rec_argc + 1, sizeof(char *));
2591
2592	if (rec_argv == NULL)
2593		return -ENOMEM;
2594
2595	j = 0;
2596	for (i = 0; i < ARRAY_SIZE(record_args); i++)
2597		rec_argv[j++] = record_args[i];
2598
2599	if (trace->trace_syscalls) {
2600		for (i = 0; i < sc_args_nr; i++)
2601			rec_argv[j++] = sc_args[i];
2602
2603		/* event string may be different for older kernels - e.g., RHEL6 */
2604		if (is_valid_tracepoint("raw_syscalls:sys_enter"))
2605			rec_argv[j++] = "raw_syscalls:sys_enter,raw_syscalls:sys_exit";
2606		else if (is_valid_tracepoint("syscalls:sys_enter"))
2607			rec_argv[j++] = "syscalls:sys_enter,syscalls:sys_exit";
2608		else {
2609			pr_err("Neither raw_syscalls nor syscalls events exist.\n");
2610			free(rec_argv);
2611			return -1;
2612		}
2613	}
2614
 
 
 
2615	if (trace->trace_pgfaults & TRACE_PFMAJ)
2616		for (i = 0; i < majpf_args_nr; i++)
2617			rec_argv[j++] = majpf_args[i];
2618
2619	if (trace->trace_pgfaults & TRACE_PFMIN)
2620		for (i = 0; i < minpf_args_nr; i++)
2621			rec_argv[j++] = minpf_args[i];
2622
2623	for (i = 0; i < (unsigned int)argc; i++)
2624		rec_argv[j++] = argv[i];
2625
2626	return cmd_record(j, rec_argv);
 
 
 
 
2627}
2628
2629static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);
2630
2631static bool evlist__add_vfs_getname(struct evlist *evlist)
2632{
2633	bool found = false;
2634	struct evsel *evsel, *tmp;
2635	struct parse_events_error err = { .idx = 0, };
2636	int ret = parse_events(evlist, "probe:vfs_getname*", &err);
2637
2638	if (ret)
 
 
 
 
 
 
2639		return false;
 
2640
2641	evlist__for_each_entry_safe(evlist, evsel, tmp) {
2642		if (!strstarts(perf_evsel__name(evsel), "probe:vfs_getname"))
2643			continue;
2644
2645		if (perf_evsel__field(evsel, "pathname")) {
2646			evsel->handler = trace__vfs_getname;
2647			found = true;
2648			continue;
2649		}
2650
2651		list_del_init(&evsel->core.node);
2652		evsel->evlist = NULL;
2653		evsel__delete(evsel);
2654	}
2655
2656	return found;
2657}
2658
2659static struct evsel *perf_evsel__new_pgfault(u64 config)
2660{
2661	struct evsel *evsel;
2662	struct perf_event_attr attr = {
2663		.type = PERF_TYPE_SOFTWARE,
2664		.mmap_data = 1,
2665	};
2666
2667	attr.config = config;
2668	attr.sample_period = 1;
2669
2670	event_attr_init(&attr);
2671
2672	evsel = evsel__new(&attr);
2673	if (evsel)
2674		evsel->handler = trace__pgfault;
2675
2676	return evsel;
2677}
2678
2679static void trace__handle_event(struct trace *trace, union perf_event *event, struct perf_sample *sample)
2680{
2681	const u32 type = event->header.type;
2682	struct evsel *evsel;
2683
2684	if (type != PERF_RECORD_SAMPLE) {
2685		trace__process_event(trace, trace->host, event, sample);
2686		return;
2687	}
2688
2689	evsel = perf_evlist__id2evsel(trace->evlist, sample->id);
2690	if (evsel == NULL) {
2691		fprintf(trace->output, "Unknown tp ID %" PRIu64 ", skipping...\n", sample->id);
2692		return;
2693	}
2694
2695	if (evswitch__discard(&trace->evswitch, evsel))
2696		return;
2697
2698	trace__set_base_time(trace, evsel, sample);
2699
2700	if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&
2701	    sample->raw_data == NULL) {
2702		fprintf(trace->output, "%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
2703		       perf_evsel__name(evsel), sample->tid,
2704		       sample->cpu, sample->raw_size);
2705	} else {
2706		tracepoint_handler handler = evsel->handler;
2707		handler(trace, evsel, event, sample);
2708	}
2709
2710	if (trace->nr_events_printed >= trace->max_events && trace->max_events != ULONG_MAX)
2711		interrupted = true;
2712}
2713
2714static int trace__add_syscall_newtp(struct trace *trace)
2715{
2716	int ret = -1;
2717	struct evlist *evlist = trace->evlist;
2718	struct evsel *sys_enter, *sys_exit;
2719
2720	sys_enter = perf_evsel__raw_syscall_newtp("sys_enter", trace__sys_enter);
2721	if (sys_enter == NULL)
2722		goto out;
2723
2724	if (perf_evsel__init_sc_tp_ptr_field(sys_enter, args))
2725		goto out_delete_sys_enter;
2726
2727	sys_exit = perf_evsel__raw_syscall_newtp("sys_exit", trace__sys_exit);
2728	if (sys_exit == NULL)
2729		goto out_delete_sys_enter;
2730
2731	if (perf_evsel__init_sc_tp_uint_field(sys_exit, ret))
2732		goto out_delete_sys_exit;
2733
2734	perf_evsel__config_callchain(sys_enter, &trace->opts, &callchain_param);
2735	perf_evsel__config_callchain(sys_exit, &trace->opts, &callchain_param);
2736
2737	evlist__add(evlist, sys_enter);
2738	evlist__add(evlist, sys_exit);
2739
2740	if (callchain_param.enabled && !trace->kernel_syscallchains) {
2741		/*
2742		 * We're interested only in the user space callchain
2743		 * leading to the syscall, allow overriding that for
2744		 * debugging reasons using --kernel_syscall_callchains
2745		 */
2746		sys_exit->core.attr.exclude_callchain_kernel = 1;
2747	}
2748
2749	trace->syscalls.events.sys_enter = sys_enter;
2750	trace->syscalls.events.sys_exit  = sys_exit;
2751
2752	ret = 0;
2753out:
2754	return ret;
2755
2756out_delete_sys_exit:
2757	evsel__delete_priv(sys_exit);
2758out_delete_sys_enter:
2759	evsel__delete_priv(sys_enter);
2760	goto out;
2761}
2762
2763static int trace__set_ev_qualifier_tp_filter(struct trace *trace)
2764{
2765	int err = -1;
2766	struct evsel *sys_exit;
2767	char *filter = asprintf_expr_inout_ints("id", !trace->not_ev_qualifier,
2768						trace->ev_qualifier_ids.nr,
2769						trace->ev_qualifier_ids.entries);
2770
2771	if (filter == NULL)
2772		goto out_enomem;
2773
2774	if (!perf_evsel__append_tp_filter(trace->syscalls.events.sys_enter,
2775					  filter)) {
2776		sys_exit = trace->syscalls.events.sys_exit;
2777		err = perf_evsel__append_tp_filter(sys_exit, filter);
2778	}
2779
2780	free(filter);
2781out:
2782	return err;
2783out_enomem:
2784	errno = ENOMEM;
2785	goto out;
2786}
2787
2788#ifdef HAVE_LIBBPF_SUPPORT
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2789static struct bpf_program *trace__find_bpf_program_by_title(struct trace *trace, const char *name)
2790{
2791	if (trace->bpf_obj == NULL)
2792		return NULL;
2793
2794	return bpf_object__find_program_by_title(trace->bpf_obj, name);
2795}
2796
2797static struct bpf_program *trace__find_syscall_bpf_prog(struct trace *trace, struct syscall *sc,
2798							const char *prog_name, const char *type)
2799{
2800	struct bpf_program *prog;
2801
2802	if (prog_name == NULL) {
2803		char default_prog_name[256];
2804		scnprintf(default_prog_name, sizeof(default_prog_name), "!syscalls:sys_%s_%s", type, sc->name);
2805		prog = trace__find_bpf_program_by_title(trace, default_prog_name);
2806		if (prog != NULL)
2807			goto out_found;
2808		if (sc->fmt && sc->fmt->alias) {
2809			scnprintf(default_prog_name, sizeof(default_prog_name), "!syscalls:sys_%s_%s", type, sc->fmt->alias);
2810			prog = trace__find_bpf_program_by_title(trace, default_prog_name);
2811			if (prog != NULL)
2812				goto out_found;
2813		}
2814		goto out_unaugmented;
2815	}
2816
2817	prog = trace__find_bpf_program_by_title(trace, prog_name);
2818
2819	if (prog != NULL) {
2820out_found:
2821		return prog;
2822	}
2823
2824	pr_debug("Couldn't find BPF prog \"%s\" to associate with syscalls:sys_%s_%s, not augmenting it\n",
2825		 prog_name, type, sc->name);
2826out_unaugmented:
2827	return trace->syscalls.unaugmented_prog;
2828}
2829
2830static void trace__init_syscall_bpf_progs(struct trace *trace, int id)
2831{
2832	struct syscall *sc = trace__syscall_info(trace, NULL, id);
2833
2834	if (sc == NULL)
2835		return;
2836
2837	sc->bpf_prog.sys_enter = trace__find_syscall_bpf_prog(trace, sc, sc->fmt ? sc->fmt->bpf_prog_name.sys_enter : NULL, "enter");
2838	sc->bpf_prog.sys_exit  = trace__find_syscall_bpf_prog(trace, sc, sc->fmt ? sc->fmt->bpf_prog_name.sys_exit  : NULL,  "exit");
2839}
2840
2841static int trace__bpf_prog_sys_enter_fd(struct trace *trace, int id)
2842{
2843	struct syscall *sc = trace__syscall_info(trace, NULL, id);
2844	return sc ? bpf_program__fd(sc->bpf_prog.sys_enter) : bpf_program__fd(trace->syscalls.unaugmented_prog);
2845}
2846
2847static int trace__bpf_prog_sys_exit_fd(struct trace *trace, int id)
2848{
2849	struct syscall *sc = trace__syscall_info(trace, NULL, id);
2850	return sc ? bpf_program__fd(sc->bpf_prog.sys_exit) : bpf_program__fd(trace->syscalls.unaugmented_prog);
2851}
2852
2853static void trace__init_bpf_map_syscall_args(struct trace *trace, int id, struct bpf_map_syscall_entry *entry)
2854{
2855	struct syscall *sc = trace__syscall_info(trace, NULL, id);
2856	int arg = 0;
2857
2858	if (sc == NULL)
2859		goto out;
2860
2861	for (; arg < sc->nr_args; ++arg) {
2862		entry->string_args_len[arg] = 0;
2863		if (sc->arg_fmt[arg].scnprintf == SCA_FILENAME) {
2864			/* Should be set like strace -s strsize */
2865			entry->string_args_len[arg] = PATH_MAX;
2866		}
2867	}
2868out:
2869	for (; arg < 6; ++arg)
2870		entry->string_args_len[arg] = 0;
2871}
2872static int trace__set_ev_qualifier_bpf_filter(struct trace *trace)
2873{
2874	int fd = bpf_map__fd(trace->syscalls.map);
2875	struct bpf_map_syscall_entry value = {
2876		.enabled = !trace->not_ev_qualifier,
2877	};
2878	int err = 0;
2879	size_t i;
2880
2881	for (i = 0; i < trace->ev_qualifier_ids.nr; ++i) {
2882		int key = trace->ev_qualifier_ids.entries[i];
2883
2884		if (value.enabled) {
2885			trace__init_bpf_map_syscall_args(trace, key, &value);
2886			trace__init_syscall_bpf_progs(trace, key);
2887		}
2888
2889		err = bpf_map_update_elem(fd, &key, &value, BPF_EXIST);
2890		if (err)
2891			break;
2892	}
2893
2894	return err;
2895}
2896
2897static int __trace__init_syscalls_bpf_map(struct trace *trace, bool enabled)
2898{
2899	int fd = bpf_map__fd(trace->syscalls.map);
2900	struct bpf_map_syscall_entry value = {
2901		.enabled = enabled,
2902	};
2903	int err = 0, key;
2904
2905	for (key = 0; key < trace->sctbl->syscalls.nr_entries; ++key) {
2906		if (enabled)
2907			trace__init_bpf_map_syscall_args(trace, key, &value);
2908
2909		err = bpf_map_update_elem(fd, &key, &value, BPF_ANY);
2910		if (err)
2911			break;
2912	}
2913
2914	return err;
2915}
2916
2917static int trace__init_syscalls_bpf_map(struct trace *trace)
2918{
2919	bool enabled = true;
2920
2921	if (trace->ev_qualifier_ids.nr)
2922		enabled = trace->not_ev_qualifier;
2923
2924	return __trace__init_syscalls_bpf_map(trace, enabled);
2925}
2926
2927static struct bpf_program *trace__find_usable_bpf_prog_entry(struct trace *trace, struct syscall *sc)
2928{
2929	struct tep_format_field *field, *candidate_field;
2930	int id;
2931
2932	/*
2933	 * We're only interested in syscalls that have a pointer:
2934	 */
2935	for (field = sc->args; field; field = field->next) {
2936		if (field->flags & TEP_FIELD_IS_POINTER)
2937			goto try_to_find_pair;
2938	}
2939
2940	return NULL;
2941
2942try_to_find_pair:
2943	for (id = 0; id < trace->sctbl->syscalls.nr_entries; ++id) {
2944		struct syscall *pair = trace__syscall_info(trace, NULL, id);
2945		struct bpf_program *pair_prog;
2946		bool is_candidate = false;
2947
2948		if (pair == NULL || pair == sc ||
2949		    pair->bpf_prog.sys_enter == trace->syscalls.unaugmented_prog)
2950			continue;
2951
2952		for (field = sc->args, candidate_field = pair->args;
2953		     field && candidate_field; field = field->next, candidate_field = candidate_field->next) {
2954			bool is_pointer = field->flags & TEP_FIELD_IS_POINTER,
2955			     candidate_is_pointer = candidate_field->flags & TEP_FIELD_IS_POINTER;
2956
2957			if (is_pointer) {
2958			       if (!candidate_is_pointer) {
2959					// The candidate just doesn't copies our pointer arg, might copy other pointers we want.
2960					continue;
2961			       }
2962			} else {
2963				if (candidate_is_pointer) {
2964					// The candidate might copy a pointer we don't have, skip it.
2965					goto next_candidate;
2966				}
2967				continue;
2968			}
2969
2970			if (strcmp(field->type, candidate_field->type))
2971				goto next_candidate;
2972
2973			is_candidate = true;
2974		}
2975
2976		if (!is_candidate)
2977			goto next_candidate;
2978
2979		/*
2980		 * Check if the tentative pair syscall augmenter has more pointers, if it has,
2981		 * then it may be collecting that and we then can't use it, as it would collect
2982		 * more than what is common to the two syscalls.
2983		 */
2984		if (candidate_field) {
2985			for (candidate_field = candidate_field->next; candidate_field; candidate_field = candidate_field->next)
2986				if (candidate_field->flags & TEP_FIELD_IS_POINTER)
2987					goto next_candidate;
2988		}
2989
2990		pair_prog = pair->bpf_prog.sys_enter;
2991		/*
2992		 * If the pair isn't enabled, then its bpf_prog.sys_enter will not
2993		 * have been searched for, so search it here and if it returns the
2994		 * unaugmented one, then ignore it, otherwise we'll reuse that BPF
2995		 * program for a filtered syscall on a non-filtered one.
2996		 *
2997		 * For instance, we have "!syscalls:sys_enter_renameat" and that is
2998		 * useful for "renameat2".
2999		 */
3000		if (pair_prog == NULL) {
3001			pair_prog = trace__find_syscall_bpf_prog(trace, pair, pair->fmt ? pair->fmt->bpf_prog_name.sys_enter : NULL, "enter");
3002			if (pair_prog == trace->syscalls.unaugmented_prog)
3003				goto next_candidate;
3004		}
3005
3006		pr_debug("Reusing \"%s\" BPF sys_enter augmenter for \"%s\"\n", pair->name, sc->name);
3007		return pair_prog;
3008	next_candidate:
3009		continue;
3010	}
3011
3012	return NULL;
3013}
3014
3015static int trace__init_syscalls_bpf_prog_array_maps(struct trace *trace)
3016{
3017	int map_enter_fd = bpf_map__fd(trace->syscalls.prog_array.sys_enter),
3018	    map_exit_fd  = bpf_map__fd(trace->syscalls.prog_array.sys_exit);
3019	int err = 0, key;
3020
3021	for (key = 0; key < trace->sctbl->syscalls.nr_entries; ++key) {
3022		int prog_fd;
3023
3024		if (!trace__syscall_enabled(trace, key))
3025			continue;
3026
3027		trace__init_syscall_bpf_progs(trace, key);
3028
3029		// It'll get at least the "!raw_syscalls:unaugmented"
3030		prog_fd = trace__bpf_prog_sys_enter_fd(trace, key);
3031		err = bpf_map_update_elem(map_enter_fd, &key, &prog_fd, BPF_ANY);
3032		if (err)
3033			break;
3034		prog_fd = trace__bpf_prog_sys_exit_fd(trace, key);
3035		err = bpf_map_update_elem(map_exit_fd, &key, &prog_fd, BPF_ANY);
3036		if (err)
3037			break;
3038	}
3039
3040	/*
3041	 * Now lets do a second pass looking for enabled syscalls without
3042	 * an augmenter that have a signature that is a superset of another
3043	 * syscall with an augmenter so that we can auto-reuse it.
3044	 *
3045	 * I.e. if we have an augmenter for the "open" syscall that has
3046	 * this signature:
3047	 *
3048	 *   int open(const char *pathname, int flags, mode_t mode);
3049	 *
3050	 * I.e. that will collect just the first string argument, then we
3051	 * can reuse it for the 'creat' syscall, that has this signature:
3052	 *
3053	 *   int creat(const char *pathname, mode_t mode);
3054	 *
3055	 * and for:
3056	 *
3057	 *   int stat(const char *pathname, struct stat *statbuf);
3058	 *   int lstat(const char *pathname, struct stat *statbuf);
3059	 *
3060	 * Because the 'open' augmenter will collect the first arg as a string,
3061	 * and leave alone all the other args, which already helps with
3062	 * beautifying 'stat' and 'lstat''s pathname arg.
3063	 *
3064	 * Then, in time, when 'stat' gets an augmenter that collects both
3065	 * first and second arg (this one on the raw_syscalls:sys_exit prog
3066	 * array tail call, then that one will be used.
3067	 */
3068	for (key = 0; key < trace->sctbl->syscalls.nr_entries; ++key) {
3069		struct syscall *sc = trace__syscall_info(trace, NULL, key);
3070		struct bpf_program *pair_prog;
3071		int prog_fd;
3072
3073		if (sc == NULL || sc->bpf_prog.sys_enter == NULL)
3074			continue;
3075
3076		/*
3077		 * For now we're just reusing the sys_enter prog, and if it
3078		 * already has an augmenter, we don't need to find one.
3079		 */
3080		if (sc->bpf_prog.sys_enter != trace->syscalls.unaugmented_prog)
3081			continue;
3082
3083		/*
3084		 * Look at all the other syscalls for one that has a signature
3085		 * that is close enough that we can share:
3086		 */
3087		pair_prog = trace__find_usable_bpf_prog_entry(trace, sc);
3088		if (pair_prog == NULL)
3089			continue;
3090
3091		sc->bpf_prog.sys_enter = pair_prog;
3092
3093		/*
3094		 * Update the BPF_MAP_TYPE_PROG_SHARED for raw_syscalls:sys_enter
3095		 * with the fd for the program we're reusing:
3096		 */
3097		prog_fd = bpf_program__fd(sc->bpf_prog.sys_enter);
3098		err = bpf_map_update_elem(map_enter_fd, &key, &prog_fd, BPF_ANY);
3099		if (err)
3100			break;
3101	}
3102
3103
3104	return err;
3105}
3106#else
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3107static int trace__set_ev_qualifier_bpf_filter(struct trace *trace __maybe_unused)
3108{
3109	return 0;
3110}
3111
3112static int trace__init_syscalls_bpf_map(struct trace *trace __maybe_unused)
3113{
3114	return 0;
3115}
3116
3117static struct bpf_program *trace__find_bpf_program_by_title(struct trace *trace __maybe_unused,
3118							    const char *name __maybe_unused)
3119{
3120	return NULL;
3121}
3122
3123static int trace__init_syscalls_bpf_prog_array_maps(struct trace *trace __maybe_unused)
3124{
3125	return 0;
3126}
 
 
 
 
3127#endif // HAVE_LIBBPF_SUPPORT
3128
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3129static int trace__set_ev_qualifier_filter(struct trace *trace)
3130{
3131	if (trace->syscalls.map)
3132		return trace__set_ev_qualifier_bpf_filter(trace);
3133	if (trace->syscalls.events.sys_enter)
3134		return trace__set_ev_qualifier_tp_filter(trace);
3135	return 0;
3136}
3137
3138static int bpf_map__set_filter_pids(struct bpf_map *map __maybe_unused,
3139				    size_t npids __maybe_unused, pid_t *pids __maybe_unused)
3140{
3141	int err = 0;
3142#ifdef HAVE_LIBBPF_SUPPORT
3143	bool value = true;
3144	int map_fd = bpf_map__fd(map);
3145	size_t i;
3146
3147	for (i = 0; i < npids; ++i) {
3148		err = bpf_map_update_elem(map_fd, &pids[i], &value, BPF_ANY);
3149		if (err)
3150			break;
3151	}
3152#endif
3153	return err;
3154}
3155
3156static int trace__set_filter_loop_pids(struct trace *trace)
3157{
3158	unsigned int nr = 1, err;
3159	pid_t pids[32] = {
3160		getpid(),
3161	};
3162	struct thread *thread = machine__find_thread(trace->host, pids[0], pids[0]);
3163
3164	while (thread && nr < ARRAY_SIZE(pids)) {
3165		struct thread *parent = machine__find_thread(trace->host, thread->ppid, thread->ppid);
3166
3167		if (parent == NULL)
3168			break;
3169
3170		if (!strcmp(thread__comm_str(parent), "sshd") ||
3171		    strstarts(thread__comm_str(parent), "gnome-terminal")) {
3172			pids[nr++] = parent->tid;
3173			break;
3174		}
3175		thread = parent;
3176	}
3177
3178	err = perf_evlist__set_tp_filter_pids(trace->evlist, nr, pids);
3179	if (!err && trace->filter_pids.map)
3180		err = bpf_map__set_filter_pids(trace->filter_pids.map, nr, pids);
3181
3182	return err;
3183}
3184
3185static int trace__set_filter_pids(struct trace *trace)
3186{
3187	int err = 0;
3188	/*
3189	 * Better not use !target__has_task() here because we need to cover the
3190	 * case where no threads were specified in the command line, but a
3191	 * workload was, and in that case we will fill in the thread_map when
3192	 * we fork the workload in perf_evlist__prepare_workload.
3193	 */
3194	if (trace->filter_pids.nr > 0) {
3195		err = perf_evlist__set_tp_filter_pids(trace->evlist, trace->filter_pids.nr,
3196						      trace->filter_pids.entries);
3197		if (!err && trace->filter_pids.map) {
3198			err = bpf_map__set_filter_pids(trace->filter_pids.map, trace->filter_pids.nr,
3199						       trace->filter_pids.entries);
3200		}
3201	} else if (perf_thread_map__pid(trace->evlist->core.threads, 0) == -1) {
3202		err = trace__set_filter_loop_pids(trace);
3203	}
3204
3205	return err;
3206}
3207
3208static int __trace__deliver_event(struct trace *trace, union perf_event *event)
3209{
3210	struct evlist *evlist = trace->evlist;
3211	struct perf_sample sample;
3212	int err;
3213
3214	err = perf_evlist__parse_sample(evlist, event, &sample);
3215	if (err)
3216		fprintf(trace->output, "Can't parse sample, err = %d, skipping...\n", err);
3217	else
3218		trace__handle_event(trace, event, &sample);
3219
3220	return 0;
3221}
3222
3223static int __trace__flush_events(struct trace *trace)
3224{
3225	u64 first = ordered_events__first_time(&trace->oe.data);
3226	u64 flush = trace->oe.last - NSEC_PER_SEC;
3227
3228	/* Is there some thing to flush.. */
3229	if (first && first < flush)
3230		return ordered_events__flush_time(&trace->oe.data, flush);
3231
3232	return 0;
3233}
3234
3235static int trace__flush_events(struct trace *trace)
3236{
3237	return !trace->sort_events ? 0 : __trace__flush_events(trace);
3238}
3239
3240static int trace__deliver_event(struct trace *trace, union perf_event *event)
3241{
3242	int err;
3243
3244	if (!trace->sort_events)
3245		return __trace__deliver_event(trace, event);
3246
3247	err = perf_evlist__parse_sample_timestamp(trace->evlist, event, &trace->oe.last);
3248	if (err && err != -1)
3249		return err;
3250
3251	err = ordered_events__queue(&trace->oe.data, event, trace->oe.last, 0);
3252	if (err)
3253		return err;
3254
3255	return trace__flush_events(trace);
3256}
3257
3258static int ordered_events__deliver_event(struct ordered_events *oe,
3259					 struct ordered_event *event)
3260{
3261	struct trace *trace = container_of(oe, struct trace, oe.data);
3262
3263	return __trace__deliver_event(trace, event->event);
3264}
3265
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3266static int trace__run(struct trace *trace, int argc, const char **argv)
3267{
3268	struct evlist *evlist = trace->evlist;
3269	struct evsel *evsel, *pgfault_maj = NULL, *pgfault_min = NULL;
3270	int err = -1, i;
3271	unsigned long before;
3272	const bool forks = argc > 0;
3273	bool draining = false;
3274
3275	trace->live = true;
3276
3277	if (!trace->raw_augmented_syscalls) {
3278		if (trace->trace_syscalls && trace__add_syscall_newtp(trace))
3279			goto out_error_raw_syscalls;
3280
3281		if (trace->trace_syscalls)
3282			trace->vfs_getname = evlist__add_vfs_getname(evlist);
3283	}
3284
3285	if ((trace->trace_pgfaults & TRACE_PFMAJ)) {
3286		pgfault_maj = perf_evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MAJ);
3287		if (pgfault_maj == NULL)
3288			goto out_error_mem;
3289		perf_evsel__config_callchain(pgfault_maj, &trace->opts, &callchain_param);
3290		evlist__add(evlist, pgfault_maj);
3291	}
3292
3293	if ((trace->trace_pgfaults & TRACE_PFMIN)) {
3294		pgfault_min = perf_evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MIN);
3295		if (pgfault_min == NULL)
3296			goto out_error_mem;
3297		perf_evsel__config_callchain(pgfault_min, &trace->opts, &callchain_param);
3298		evlist__add(evlist, pgfault_min);
3299	}
3300
3301	if (trace->sched &&
3302	    perf_evlist__add_newtp(evlist, "sched", "sched_stat_runtime",
3303				   trace__sched_stat_runtime))
3304		goto out_error_sched_stat_runtime;
3305
3306	/*
3307	 * If a global cgroup was set, apply it to all the events without an
3308	 * explicit cgroup. I.e.:
3309	 *
3310	 * 	trace -G A -e sched:*switch
3311	 *
3312	 * Will set all raw_syscalls:sys_{enter,exit}, pgfault, vfs_getname, etc
3313	 * _and_ sched:sched_switch to the 'A' cgroup, while:
3314	 *
3315	 * trace -e sched:*switch -G A
3316	 *
3317	 * will only set the sched:sched_switch event to the 'A' cgroup, all the
3318	 * other events (raw_syscalls:sys_{enter,exit}, etc are left "without"
3319	 * a cgroup (on the root cgroup, sys wide, etc).
3320	 *
3321	 * Multiple cgroups:
3322	 *
3323	 * trace -G A -e sched:*switch -G B
3324	 *
3325	 * the syscall ones go to the 'A' cgroup, the sched:sched_switch goes
3326	 * to the 'B' cgroup.
3327	 *
3328	 * evlist__set_default_cgroup() grabs a reference of the passed cgroup
3329	 * only for the evsels still without a cgroup, i.e. evsel->cgroup == NULL.
3330	 */
3331	if (trace->cgroup)
3332		evlist__set_default_cgroup(trace->evlist, trace->cgroup);
3333
3334	err = perf_evlist__create_maps(evlist, &trace->opts.target);
3335	if (err < 0) {
3336		fprintf(trace->output, "Problems parsing the target to trace, check your options!\n");
3337		goto out_delete_evlist;
3338	}
3339
3340	err = trace__symbols_init(trace, evlist);
3341	if (err < 0) {
3342		fprintf(trace->output, "Problems initializing symbol libraries!\n");
3343		goto out_delete_evlist;
3344	}
3345
3346	perf_evlist__config(evlist, &trace->opts, &callchain_param);
3347
3348	signal(SIGCHLD, sig_handler);
3349	signal(SIGINT, sig_handler);
3350
3351	if (forks) {
3352		err = perf_evlist__prepare_workload(evlist, &trace->opts.target,
3353						    argv, false, NULL);
3354		if (err < 0) {
3355			fprintf(trace->output, "Couldn't run the workload!\n");
3356			goto out_delete_evlist;
3357		}
3358	}
3359
3360	err = evlist__open(evlist);
3361	if (err < 0)
3362		goto out_error_open;
3363
3364	err = bpf__apply_obj_config();
3365	if (err) {
3366		char errbuf[BUFSIZ];
3367
3368		bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
3369		pr_err("ERROR: Apply config to BPF failed: %s\n",
3370			 errbuf);
3371		goto out_error_open;
3372	}
3373
3374	err = trace__set_filter_pids(trace);
3375	if (err < 0)
3376		goto out_error_mem;
3377
3378	if (trace->syscalls.map)
3379		trace__init_syscalls_bpf_map(trace);
3380
3381	if (trace->syscalls.prog_array.sys_enter)
3382		trace__init_syscalls_bpf_prog_array_maps(trace);
3383
3384	if (trace->ev_qualifier_ids.nr > 0) {
3385		err = trace__set_ev_qualifier_filter(trace);
3386		if (err < 0)
3387			goto out_errno;
3388
3389		if (trace->syscalls.events.sys_exit) {
3390			pr_debug("event qualifier tracepoint filter: %s\n",
3391				 trace->syscalls.events.sys_exit->filter);
3392		}
3393	}
3394
3395	/*
3396	 * If the "close" syscall is not traced, then we will not have the
3397	 * opportunity to, in syscall_arg__scnprintf_close_fd() invalidate the
3398	 * fd->pathname table and were ending up showing the last value set by
3399	 * syscalls opening a pathname and associating it with a descriptor or
3400	 * reading it from /proc/pid/fd/ in cases where that doesn't make
3401	 * sense.
3402	 *
3403	 *  So just disable this beautifier (SCA_FD, SCA_FDAT) when 'close' is
3404	 *  not in use.
3405	 */
3406	trace->fd_path_disabled = !trace__syscall_enabled(trace, syscalltbl__id(trace->sctbl, "close"));
3407
 
 
 
3408	err = perf_evlist__apply_filters(evlist, &evsel);
3409	if (err < 0)
3410		goto out_error_apply_filters;
3411
3412	if (trace->dump.map)
3413		bpf_map__fprintf(trace->dump.map, trace->output);
3414
3415	err = evlist__mmap(evlist, trace->opts.mmap_pages);
3416	if (err < 0)
3417		goto out_error_mmap;
3418
3419	if (!target__none(&trace->opts.target) && !trace->opts.initial_delay)
3420		evlist__enable(evlist);
3421
3422	if (forks)
3423		perf_evlist__start_workload(evlist);
3424
3425	if (trace->opts.initial_delay) {
3426		usleep(trace->opts.initial_delay * 1000);
3427		evlist__enable(evlist);
3428	}
3429
3430	trace->multiple_threads = perf_thread_map__pid(evlist->core.threads, 0) == -1 ||
3431				  evlist->core.threads->nr > 1 ||
3432				  evlist__first(evlist)->core.attr.inherit;
3433
3434	/*
3435	 * Now that we already used evsel->core.attr to ask the kernel to setup the
3436	 * events, lets reuse evsel->core.attr.sample_max_stack as the limit in
3437	 * trace__resolve_callchain(), allowing per-event max-stack settings
3438	 * to override an explicitly set --max-stack global setting.
3439	 */
3440	evlist__for_each_entry(evlist, evsel) {
3441		if (evsel__has_callchain(evsel) &&
3442		    evsel->core.attr.sample_max_stack == 0)
3443			evsel->core.attr.sample_max_stack = trace->max_stack;
3444	}
3445again:
3446	before = trace->nr_events;
3447
3448	for (i = 0; i < evlist->core.nr_mmaps; i++) {
3449		union perf_event *event;
3450		struct mmap *md;
3451
3452		md = &evlist->mmap[i];
3453		if (perf_mmap__read_init(md) < 0)
3454			continue;
3455
3456		while ((event = perf_mmap__read_event(md)) != NULL) {
3457			++trace->nr_events;
3458
3459			err = trace__deliver_event(trace, event);
3460			if (err)
3461				goto out_disable;
3462
3463			perf_mmap__consume(md);
3464
3465			if (interrupted)
3466				goto out_disable;
3467
3468			if (done && !draining) {
3469				evlist__disable(evlist);
3470				draining = true;
3471			}
3472		}
3473		perf_mmap__read_done(md);
3474	}
3475
3476	if (trace->nr_events == before) {
3477		int timeout = done ? 100 : -1;
3478
3479		if (!draining && evlist__poll(evlist, timeout) > 0) {
3480			if (evlist__filter_pollfd(evlist, POLLERR | POLLHUP | POLLNVAL) == 0)
3481				draining = true;
3482
3483			goto again;
3484		} else {
3485			if (trace__flush_events(trace))
3486				goto out_disable;
3487		}
3488	} else {
3489		goto again;
3490	}
3491
3492out_disable:
3493	thread__zput(trace->current);
3494
3495	evlist__disable(evlist);
3496
3497	if (trace->sort_events)
3498		ordered_events__flush(&trace->oe.data, OE_FLUSH__FINAL);
3499
3500	if (!err) {
3501		if (trace->summary)
3502			trace__fprintf_thread_summary(trace, trace->output);
3503
3504		if (trace->show_tool_stats) {
3505			fprintf(trace->output, "Stats:\n "
3506					       " vfs_getname : %" PRIu64 "\n"
3507					       " proc_getname: %" PRIu64 "\n",
3508				trace->stats.vfs_getname,
3509				trace->stats.proc_getname);
3510		}
3511	}
3512
3513out_delete_evlist:
3514	trace__symbols__exit(trace);
3515
3516	evlist__delete(evlist);
3517	cgroup__put(trace->cgroup);
3518	trace->evlist = NULL;
3519	trace->live = false;
3520	return err;
3521{
3522	char errbuf[BUFSIZ];
3523
3524out_error_sched_stat_runtime:
3525	tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "sched", "sched_stat_runtime");
3526	goto out_error;
3527
3528out_error_raw_syscalls:
3529	tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "raw_syscalls", "sys_(enter|exit)");
3530	goto out_error;
3531
3532out_error_mmap:
3533	perf_evlist__strerror_mmap(evlist, errno, errbuf, sizeof(errbuf));
3534	goto out_error;
3535
3536out_error_open:
3537	perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
3538
3539out_error:
3540	fprintf(trace->output, "%s\n", errbuf);
3541	goto out_delete_evlist;
3542
3543out_error_apply_filters:
3544	fprintf(trace->output,
3545		"Failed to set filter \"%s\" on event %s with %d (%s)\n",
3546		evsel->filter, perf_evsel__name(evsel), errno,
3547		str_error_r(errno, errbuf, sizeof(errbuf)));
3548	goto out_delete_evlist;
3549}
3550out_error_mem:
3551	fprintf(trace->output, "Not enough memory to run!\n");
3552	goto out_delete_evlist;
3553
3554out_errno:
3555	fprintf(trace->output, "errno=%d,%s\n", errno, strerror(errno));
3556	goto out_delete_evlist;
3557}
3558
3559static int trace__replay(struct trace *trace)
3560{
3561	const struct evsel_str_handler handlers[] = {
3562		{ "probe:vfs_getname",	     trace__vfs_getname, },
3563	};
3564	struct perf_data data = {
3565		.path  = input_name,
3566		.mode  = PERF_DATA_MODE_READ,
3567		.force = trace->force,
3568	};
3569	struct perf_session *session;
3570	struct evsel *evsel;
3571	int err = -1;
3572
3573	trace->tool.sample	  = trace__process_sample;
3574	trace->tool.mmap	  = perf_event__process_mmap;
3575	trace->tool.mmap2	  = perf_event__process_mmap2;
3576	trace->tool.comm	  = perf_event__process_comm;
3577	trace->tool.exit	  = perf_event__process_exit;
3578	trace->tool.fork	  = perf_event__process_fork;
3579	trace->tool.attr	  = perf_event__process_attr;
3580	trace->tool.tracing_data  = perf_event__process_tracing_data;
3581	trace->tool.build_id	  = perf_event__process_build_id;
3582	trace->tool.namespaces	  = perf_event__process_namespaces;
3583
3584	trace->tool.ordered_events = true;
3585	trace->tool.ordering_requires_timestamps = true;
3586
3587	/* add tid to output */
3588	trace->multiple_threads = true;
3589
3590	session = perf_session__new(&data, false, &trace->tool);
3591	if (IS_ERR(session))
3592		return PTR_ERR(session);
3593
3594	if (trace->opts.target.pid)
3595		symbol_conf.pid_list_str = strdup(trace->opts.target.pid);
3596
3597	if (trace->opts.target.tid)
3598		symbol_conf.tid_list_str = strdup(trace->opts.target.tid);
3599
3600	if (symbol__init(&session->header.env) < 0)
3601		goto out;
3602
3603	trace->host = &session->machines.host;
3604
3605	err = perf_session__set_tracepoints_handlers(session, handlers);
3606	if (err)
3607		goto out;
3608
3609	evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
3610						     "raw_syscalls:sys_enter");
3611	/* older kernels have syscalls tp versus raw_syscalls */
3612	if (evsel == NULL)
3613		evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
3614							     "syscalls:sys_enter");
3615
3616	if (evsel &&
3617	    (perf_evsel__init_raw_syscall_tp(evsel, trace__sys_enter) < 0 ||
3618	    perf_evsel__init_sc_tp_ptr_field(evsel, args))) {
3619		pr_err("Error during initialize raw_syscalls:sys_enter event\n");
3620		goto out;
3621	}
3622
3623	evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
3624						     "raw_syscalls:sys_exit");
3625	if (evsel == NULL)
3626		evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
3627							     "syscalls:sys_exit");
3628	if (evsel &&
3629	    (perf_evsel__init_raw_syscall_tp(evsel, trace__sys_exit) < 0 ||
3630	    perf_evsel__init_sc_tp_uint_field(evsel, ret))) {
3631		pr_err("Error during initialize raw_syscalls:sys_exit event\n");
3632		goto out;
3633	}
3634
3635	evlist__for_each_entry(session->evlist, evsel) {
3636		if (evsel->core.attr.type == PERF_TYPE_SOFTWARE &&
3637		    (evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ||
3638		     evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
3639		     evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS))
3640			evsel->handler = trace__pgfault;
3641	}
3642
3643	setup_pager();
3644
3645	err = perf_session__process_events(session);
3646	if (err)
3647		pr_err("Failed to process events, error %d", err);
3648
3649	else if (trace->summary)
3650		trace__fprintf_thread_summary(trace, trace->output);
3651
3652out:
3653	perf_session__delete(session);
3654
3655	return err;
3656}
3657
3658static size_t trace__fprintf_threads_header(FILE *fp)
3659{
3660	size_t printed;
3661
3662	printed  = fprintf(fp, "\n Summary of events:\n\n");
3663
3664	return printed;
3665}
3666
3667DEFINE_RESORT_RB(syscall_stats, a->msecs > b->msecs,
3668	struct stats 	*stats;
3669	double		msecs;
3670	int		syscall;
3671)
3672{
3673	struct int_node *source = rb_entry(nd, struct int_node, rb_node);
3674	struct stats *stats = source->priv;
3675
3676	entry->syscall = source->i;
3677	entry->stats   = stats;
3678	entry->msecs   = stats ? (u64)stats->n * (avg_stats(stats) / NSEC_PER_MSEC) : 0;
3679}
3680
3681static size_t thread__dump_stats(struct thread_trace *ttrace,
3682				 struct trace *trace, FILE *fp)
3683{
3684	size_t printed = 0;
3685	struct syscall *sc;
3686	struct rb_node *nd;
3687	DECLARE_RESORT_RB_INTLIST(syscall_stats, ttrace->syscall_stats);
3688
3689	if (syscall_stats == NULL)
3690		return 0;
3691
3692	printed += fprintf(fp, "\n");
3693
3694	printed += fprintf(fp, "   syscall            calls    total       min       avg       max      stddev\n");
3695	printed += fprintf(fp, "                               (msec)    (msec)    (msec)    (msec)        (%%)\n");
3696	printed += fprintf(fp, "   --------------- -------- --------- --------- --------- ---------     ------\n");
3697
3698	resort_rb__for_each_entry(nd, syscall_stats) {
3699		struct stats *stats = syscall_stats_entry->stats;
3700		if (stats) {
3701			double min = (double)(stats->min) / NSEC_PER_MSEC;
3702			double max = (double)(stats->max) / NSEC_PER_MSEC;
3703			double avg = avg_stats(stats);
3704			double pct;
3705			u64 n = (u64) stats->n;
3706
3707			pct = avg ? 100.0 * stddev_stats(stats)/avg : 0.0;
3708			avg /= NSEC_PER_MSEC;
3709
3710			sc = &trace->syscalls.table[syscall_stats_entry->syscall];
3711			printed += fprintf(fp, "   %-15s", sc->name);
3712			printed += fprintf(fp, " %8" PRIu64 " %9.3f %9.3f %9.3f",
3713					   n, syscall_stats_entry->msecs, min, avg);
3714			printed += fprintf(fp, " %9.3f %9.2f%%\n", max, pct);
 
 
 
 
 
 
 
 
 
 
3715		}
3716	}
3717
3718	resort_rb__delete(syscall_stats);
3719	printed += fprintf(fp, "\n\n");
3720
3721	return printed;
3722}
3723
3724static size_t trace__fprintf_thread(FILE *fp, struct thread *thread, struct trace *trace)
3725{
3726	size_t printed = 0;
3727	struct thread_trace *ttrace = thread__priv(thread);
3728	double ratio;
3729
3730	if (ttrace == NULL)
3731		return 0;
3732
3733	ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;
3734
3735	printed += fprintf(fp, " %s (%d), ", thread__comm_str(thread), thread->tid);
3736	printed += fprintf(fp, "%lu events, ", ttrace->nr_events);
3737	printed += fprintf(fp, "%.1f%%", ratio);
3738	if (ttrace->pfmaj)
3739		printed += fprintf(fp, ", %lu majfaults", ttrace->pfmaj);
3740	if (ttrace->pfmin)
3741		printed += fprintf(fp, ", %lu minfaults", ttrace->pfmin);
3742	if (trace->sched)
3743		printed += fprintf(fp, ", %.3f msec\n", ttrace->runtime_ms);
3744	else if (fputc('\n', fp) != EOF)
3745		++printed;
3746
3747	printed += thread__dump_stats(ttrace, trace, fp);
3748
3749	return printed;
3750}
3751
3752static unsigned long thread__nr_events(struct thread_trace *ttrace)
3753{
3754	return ttrace ? ttrace->nr_events : 0;
3755}
3756
3757DEFINE_RESORT_RB(threads, (thread__nr_events(a->thread->priv) < thread__nr_events(b->thread->priv)),
3758	struct thread *thread;
3759)
3760{
3761	entry->thread = rb_entry(nd, struct thread, rb_node);
3762}
3763
3764static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
3765{
3766	size_t printed = trace__fprintf_threads_header(fp);
3767	struct rb_node *nd;
3768	int i;
3769
3770	for (i = 0; i < THREADS__TABLE_SIZE; i++) {
3771		DECLARE_RESORT_RB_MACHINE_THREADS(threads, trace->host, i);
3772
3773		if (threads == NULL) {
3774			fprintf(fp, "%s", "Error sorting output by nr_events!\n");
3775			return 0;
3776		}
3777
3778		resort_rb__for_each_entry(nd, threads)
3779			printed += trace__fprintf_thread(fp, threads_entry->thread, trace);
3780
3781		resort_rb__delete(threads);
3782	}
3783	return printed;
3784}
3785
3786static int trace__set_duration(const struct option *opt, const char *str,
3787			       int unset __maybe_unused)
3788{
3789	struct trace *trace = opt->value;
3790
3791	trace->duration_filter = atof(str);
3792	return 0;
3793}
3794
3795static int trace__set_filter_pids_from_option(const struct option *opt, const char *str,
3796					      int unset __maybe_unused)
3797{
3798	int ret = -1;
3799	size_t i;
3800	struct trace *trace = opt->value;
3801	/*
3802	 * FIXME: introduce a intarray class, plain parse csv and create a
3803	 * { int nr, int entries[] } struct...
3804	 */
3805	struct intlist *list = intlist__new(str);
3806
3807	if (list == NULL)
3808		return -1;
3809
3810	i = trace->filter_pids.nr = intlist__nr_entries(list) + 1;
3811	trace->filter_pids.entries = calloc(i, sizeof(pid_t));
3812
3813	if (trace->filter_pids.entries == NULL)
3814		goto out;
3815
3816	trace->filter_pids.entries[0] = getpid();
3817
3818	for (i = 1; i < trace->filter_pids.nr; ++i)
3819		trace->filter_pids.entries[i] = intlist__entry(list, i - 1)->i;
3820
3821	intlist__delete(list);
3822	ret = 0;
3823out:
3824	return ret;
3825}
3826
3827static int trace__open_output(struct trace *trace, const char *filename)
3828{
3829	struct stat st;
3830
3831	if (!stat(filename, &st) && st.st_size) {
3832		char oldname[PATH_MAX];
3833
3834		scnprintf(oldname, sizeof(oldname), "%s.old", filename);
3835		unlink(oldname);
3836		rename(filename, oldname);
3837	}
3838
3839	trace->output = fopen(filename, "w");
3840
3841	return trace->output == NULL ? -errno : 0;
3842}
3843
3844static int parse_pagefaults(const struct option *opt, const char *str,
3845			    int unset __maybe_unused)
3846{
3847	int *trace_pgfaults = opt->value;
3848
3849	if (strcmp(str, "all") == 0)
3850		*trace_pgfaults |= TRACE_PFMAJ | TRACE_PFMIN;
3851	else if (strcmp(str, "maj") == 0)
3852		*trace_pgfaults |= TRACE_PFMAJ;
3853	else if (strcmp(str, "min") == 0)
3854		*trace_pgfaults |= TRACE_PFMIN;
3855	else
3856		return -1;
3857
3858	return 0;
3859}
3860
3861static void evlist__set_evsel_handler(struct evlist *evlist, void *handler)
3862{
3863	struct evsel *evsel;
3864
3865	evlist__for_each_entry(evlist, evsel)
3866		evsel->handler = handler;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3867}
3868
3869static int evlist__set_syscall_tp_fields(struct evlist *evlist)
3870{
3871	struct evsel *evsel;
3872
3873	evlist__for_each_entry(evlist, evsel) {
3874		if (evsel->priv || !evsel->tp_format)
3875			continue;
3876
3877		if (strcmp(evsel->tp_format->system, "syscalls"))
 
3878			continue;
 
3879
3880		if (perf_evsel__init_syscall_tp(evsel))
3881			return -1;
3882
3883		if (!strncmp(evsel->tp_format->name, "sys_enter_", 10)) {
3884			struct syscall_tp *sc = evsel->priv;
3885
3886			if (__tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64)))
3887				return -1;
 
 
3888		} else if (!strncmp(evsel->tp_format->name, "sys_exit_", 9)) {
3889			struct syscall_tp *sc = evsel->priv;
3890
3891			if (__tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap))
3892				return -1;
 
 
3893		}
3894	}
3895
3896	return 0;
3897}
3898
3899/*
3900 * XXX: Hackish, just splitting the combined -e+--event (syscalls
3901 * (raw_syscalls:{sys_{enter,exit}} + events (tracepoints, HW, SW, etc) to use
3902 * existing facilities unchanged (trace->ev_qualifier + parse_options()).
3903 *
3904 * It'd be better to introduce a parse_options() variant that would return a
3905 * list with the terms it didn't match to an event...
3906 */
3907static int trace__parse_events_option(const struct option *opt, const char *str,
3908				      int unset __maybe_unused)
3909{
3910	struct trace *trace = (struct trace *)opt->value;
3911	const char *s = str;
3912	char *sep = NULL, *lists[2] = { NULL, NULL, };
3913	int len = strlen(str) + 1, err = -1, list, idx;
3914	char *strace_groups_dir = system_path(STRACE_GROUPS_DIR);
3915	char group_name[PATH_MAX];
3916	struct syscall_fmt *fmt;
3917
3918	if (strace_groups_dir == NULL)
3919		return -1;
3920
3921	if (*s == '!') {
3922		++s;
3923		trace->not_ev_qualifier = true;
3924	}
3925
3926	while (1) {
3927		if ((sep = strchr(s, ',')) != NULL)
3928			*sep = '\0';
3929
3930		list = 0;
3931		if (syscalltbl__id(trace->sctbl, s) >= 0 ||
3932		    syscalltbl__strglobmatch_first(trace->sctbl, s, &idx) >= 0) {
3933			list = 1;
3934			goto do_concat;
3935		}
3936
3937		fmt = syscall_fmt__find_by_alias(s);
3938		if (fmt != NULL) {
3939			list = 1;
3940			s = fmt->name;
3941		} else {
3942			path__join(group_name, sizeof(group_name), strace_groups_dir, s);
3943			if (access(group_name, R_OK) == 0)
3944				list = 1;
3945		}
3946do_concat:
3947		if (lists[list]) {
3948			sprintf(lists[list] + strlen(lists[list]), ",%s", s);
3949		} else {
3950			lists[list] = malloc(len);
3951			if (lists[list] == NULL)
3952				goto out;
3953			strcpy(lists[list], s);
3954		}
3955
3956		if (!sep)
3957			break;
3958
3959		*sep = ',';
3960		s = sep + 1;
3961	}
3962
3963	if (lists[1] != NULL) {
3964		struct strlist_config slist_config = {
3965			.dirname = strace_groups_dir,
3966		};
3967
3968		trace->ev_qualifier = strlist__new(lists[1], &slist_config);
3969		if (trace->ev_qualifier == NULL) {
3970			fputs("Not enough memory to parse event qualifier", trace->output);
3971			goto out;
3972		}
3973
3974		if (trace__validate_ev_qualifier(trace))
3975			goto out;
3976		trace->trace_syscalls = true;
3977	}
3978
3979	err = 0;
3980
3981	if (lists[0]) {
3982		struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event",
3983					       "event selector. use 'perf list' to list available events",
3984					       parse_events_option);
3985		err = parse_events_option(&o, lists[0], 0);
3986	}
3987out:
3988	if (sep)
3989		*sep = ',';
3990
3991	return err;
3992}
3993
3994static int trace__parse_cgroups(const struct option *opt, const char *str, int unset)
3995{
3996	struct trace *trace = opt->value;
3997
3998	if (!list_empty(&trace->evlist->core.entries))
3999		return parse_cgroups(opt, str, unset);
4000
4001	trace->cgroup = evlist__findnew_cgroup(trace->evlist, str);
4002
4003	return 0;
4004}
4005
4006static struct bpf_map *trace__find_bpf_map_by_name(struct trace *trace, const char *name)
4007{
4008	if (trace->bpf_obj == NULL)
4009		return NULL;
4010
4011	return bpf_object__find_map_by_name(trace->bpf_obj, name);
4012}
4013
4014static void trace__set_bpf_map_filtered_pids(struct trace *trace)
4015{
4016	trace->filter_pids.map = trace__find_bpf_map_by_name(trace, "pids_filtered");
4017}
4018
4019static void trace__set_bpf_map_syscalls(struct trace *trace)
4020{
4021	trace->syscalls.map = trace__find_bpf_map_by_name(trace, "syscalls");
4022	trace->syscalls.prog_array.sys_enter = trace__find_bpf_map_by_name(trace, "syscalls_sys_enter");
4023	trace->syscalls.prog_array.sys_exit  = trace__find_bpf_map_by_name(trace, "syscalls_sys_exit");
4024}
4025
4026static int trace__config(const char *var, const char *value, void *arg)
4027{
4028	struct trace *trace = arg;
4029	int err = 0;
4030
4031	if (!strcmp(var, "trace.add_events")) {
4032		struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event",
4033					       "event selector. use 'perf list' to list available events",
4034					       parse_events_option);
4035		/*
4036		 * We can't propagate parse_event_option() return, as it is 1
4037		 * for failure while perf_config() expects -1.
4038		 */
4039		if (parse_events_option(&o, value, 0))
4040			err = -1;
4041	} else if (!strcmp(var, "trace.show_timestamp")) {
4042		trace->show_tstamp = perf_config_bool(var, value);
4043	} else if (!strcmp(var, "trace.show_duration")) {
4044		trace->show_duration = perf_config_bool(var, value);
4045	} else if (!strcmp(var, "trace.show_arg_names")) {
4046		trace->show_arg_names = perf_config_bool(var, value);
4047		if (!trace->show_arg_names)
4048			trace->show_zeros = true;
4049	} else if (!strcmp(var, "trace.show_zeros")) {
4050		bool new_show_zeros = perf_config_bool(var, value);
4051		if (!trace->show_arg_names && !new_show_zeros) {
4052			pr_warning("trace.show_zeros has to be set when trace.show_arg_names=no\n");
4053			goto out;
4054		}
4055		trace->show_zeros = new_show_zeros;
4056	} else if (!strcmp(var, "trace.show_prefix")) {
4057		trace->show_string_prefix = perf_config_bool(var, value);
4058	} else if (!strcmp(var, "trace.no_inherit")) {
4059		trace->opts.no_inherit = perf_config_bool(var, value);
4060	} else if (!strcmp(var, "trace.args_alignment")) {
4061		int args_alignment = 0;
4062		if (perf_config_int(&args_alignment, var, value) == 0)
4063			trace->args_alignment = args_alignment;
 
 
 
 
 
4064	}
4065out:
4066	return err;
4067}
4068
4069int cmd_trace(int argc, const char **argv)
4070{
4071	const char *trace_usage[] = {
4072		"perf trace [<options>] [<command>]",
4073		"perf trace [<options>] -- <command> [<options>]",
4074		"perf trace record [<options>] [<command>]",
4075		"perf trace record [<options>] -- <command> [<options>]",
4076		NULL
4077	};
4078	struct trace trace = {
4079		.opts = {
4080			.target = {
4081				.uid	   = UINT_MAX,
4082				.uses_mmap = true,
4083			},
4084			.user_freq     = UINT_MAX,
4085			.user_interval = ULLONG_MAX,
4086			.no_buffering  = true,
4087			.mmap_pages    = UINT_MAX,
4088		},
4089		.output = stderr,
4090		.show_comm = true,
4091		.show_tstamp = true,
4092		.show_duration = true,
4093		.show_arg_names = true,
4094		.args_alignment = 70,
4095		.trace_syscalls = false,
4096		.kernel_syscallchains = false,
4097		.max_stack = UINT_MAX,
4098		.max_events = ULONG_MAX,
4099	};
4100	const char *map_dump_str = NULL;
4101	const char *output_name = NULL;
4102	const struct option trace_options[] = {
4103	OPT_CALLBACK('e', "event", &trace, "event",
4104		     "event/syscall selector. use 'perf list' to list available events",
4105		     trace__parse_events_option),
 
 
4106	OPT_BOOLEAN(0, "comm", &trace.show_comm,
4107		    "show the thread COMM next to its id"),
4108	OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),
4109	OPT_CALLBACK(0, "expr", &trace, "expr", "list of syscalls/events to trace",
4110		     trace__parse_events_option),
4111	OPT_STRING('o', "output", &output_name, "file", "output file name"),
4112	OPT_STRING('i', "input", &input_name, "file", "Analyze events in file"),
4113	OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
4114		    "trace events on existing process id"),
4115	OPT_STRING('t', "tid", &trace.opts.target.tid, "tid",
4116		    "trace events on existing thread id"),
4117	OPT_CALLBACK(0, "filter-pids", &trace, "CSV list of pids",
4118		     "pids to filter (by the kernel)", trace__set_filter_pids_from_option),
4119	OPT_BOOLEAN('a', "all-cpus", &trace.opts.target.system_wide,
4120		    "system-wide collection from all CPUs"),
4121	OPT_STRING('C', "cpu", &trace.opts.target.cpu_list, "cpu",
4122		    "list of cpus to monitor"),
4123	OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
4124		    "child tasks do not inherit counters"),
4125	OPT_CALLBACK('m', "mmap-pages", &trace.opts.mmap_pages, "pages",
4126		     "number of mmap data pages",
4127		     perf_evlist__parse_mmap_pages),
4128	OPT_STRING('u', "uid", &trace.opts.target.uid_str, "user",
4129		   "user to profile"),
4130	OPT_CALLBACK(0, "duration", &trace, "float",
4131		     "show only events with duration > N.M ms",
4132		     trace__set_duration),
4133#ifdef HAVE_LIBBPF_SUPPORT
4134	OPT_STRING(0, "map-dump", &map_dump_str, "BPF map", "BPF map to periodically dump"),
4135#endif
4136	OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
4137	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
4138	OPT_BOOLEAN('T', "time", &trace.full_time,
4139		    "Show full timestamp, not time relative to first start"),
4140	OPT_BOOLEAN(0, "failure", &trace.failure_only,
4141		    "Show only syscalls that failed"),
4142	OPT_BOOLEAN('s', "summary", &trace.summary_only,
4143		    "Show only syscall summary with statistics"),
4144	OPT_BOOLEAN('S', "with-summary", &trace.summary,
4145		    "Show all syscalls and summary with statistics"),
 
 
4146	OPT_CALLBACK_DEFAULT('F', "pf", &trace.trace_pgfaults, "all|maj|min",
4147		     "Trace pagefaults", parse_pagefaults, "maj"),
4148	OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"),
4149	OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"),
4150	OPT_CALLBACK(0, "call-graph", &trace.opts,
4151		     "record_mode[,record_size]", record_callchain_help,
4152		     &record_parse_callchain_opt),
 
 
4153	OPT_BOOLEAN(0, "kernel-syscall-graph", &trace.kernel_syscallchains,
4154		    "Show the kernel callchains on the syscall exit path"),
4155	OPT_ULONG(0, "max-events", &trace.max_events,
4156		"Set the maximum number of events to print, exit after that is reached. "),
4157	OPT_UINTEGER(0, "min-stack", &trace.min_stack,
4158		     "Set the minimum stack depth when parsing the callchain, "
4159		     "anything below the specified depth will be ignored."),
4160	OPT_UINTEGER(0, "max-stack", &trace.max_stack,
4161		     "Set the maximum stack depth when parsing the callchain, "
4162		     "anything beyond the specified depth will be ignored. "
4163		     "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
4164	OPT_BOOLEAN(0, "sort-events", &trace.sort_events,
4165			"Sort batch of events before processing, use if getting out of order events"),
4166	OPT_BOOLEAN(0, "print-sample", &trace.print_sample,
4167			"print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),
4168	OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
4169			"per thread proc mmap processing timeout in ms"),
4170	OPT_CALLBACK('G', "cgroup", &trace, "name", "monitor event in cgroup name only",
4171		     trace__parse_cgroups),
4172	OPT_UINTEGER('D', "delay", &trace.opts.initial_delay,
4173		     "ms to wait before starting measurement after program "
4174		     "start"),
4175	OPTS_EVSWITCH(&trace.evswitch),
4176	OPT_END()
4177	};
4178	bool __maybe_unused max_stack_user_set = true;
4179	bool mmap_pages_user_set = true;
4180	struct evsel *evsel;
4181	const char * const trace_subcommands[] = { "record", NULL };
4182	int err = -1;
4183	char bf[BUFSIZ];
4184
4185	signal(SIGSEGV, sighandler_dump_stack);
4186	signal(SIGFPE, sighandler_dump_stack);
4187
4188	trace.evlist = evlist__new();
4189	trace.sctbl = syscalltbl__new();
4190
4191	if (trace.evlist == NULL || trace.sctbl == NULL) {
4192		pr_err("Not enough memory to run!\n");
4193		err = -ENOMEM;
4194		goto out;
4195	}
4196
4197	/*
4198	 * Parsing .perfconfig may entail creating a BPF event, that may need
4199	 * to create BPF maps, so bump RLIM_MEMLOCK as the default 64K setting
4200	 * is too small. This affects just this process, not touching the
4201	 * global setting. If it fails we'll get something in 'perf trace -v'
4202	 * to help diagnose the problem.
4203	 */
4204	rlimit__bump_memlock();
4205
4206	err = perf_config(trace__config, &trace);
4207	if (err)
4208		goto out;
4209
4210	argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
4211				 trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);
4212
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4213	if ((nr_cgroups || trace.cgroup) && !trace.opts.target.system_wide) {
4214		usage_with_options_msg(trace_usage, trace_options,
4215				       "cgroup monitoring only available in system-wide mode");
4216	}
4217
4218	evsel = bpf__setup_output_event(trace.evlist, "__augmented_syscalls__");
4219	if (IS_ERR(evsel)) {
4220		bpf__strerror_setup_output_event(trace.evlist, PTR_ERR(evsel), bf, sizeof(bf));
4221		pr_err("ERROR: Setup trace syscalls enter failed: %s\n", bf);
4222		goto out;
4223	}
4224
4225	if (evsel) {
4226		trace.syscalls.events.augmented = evsel;
4227
4228		evsel = perf_evlist__find_tracepoint_by_name(trace.evlist, "raw_syscalls:sys_enter");
4229		if (evsel == NULL) {
4230			pr_err("ERROR: raw_syscalls:sys_enter not found in the augmented BPF object\n");
4231			goto out;
4232		}
4233
4234		if (evsel->bpf_obj == NULL) {
4235			pr_err("ERROR: raw_syscalls:sys_enter not associated to a BPF object\n");
4236			goto out;
4237		}
4238
4239		trace.bpf_obj = evsel->bpf_obj;
4240
4241		trace__set_bpf_map_filtered_pids(&trace);
4242		trace__set_bpf_map_syscalls(&trace);
4243		trace.syscalls.unaugmented_prog = trace__find_bpf_program_by_title(&trace, "!raw_syscalls:unaugmented");
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4244	}
4245
4246	err = bpf__setup_stdout(trace.evlist);
4247	if (err) {
4248		bpf__strerror_setup_stdout(trace.evlist, err, bf, sizeof(bf));
4249		pr_err("ERROR: Setup BPF stdout failed: %s\n", bf);
4250		goto out;
4251	}
4252
4253	err = -1;
4254
4255	if (map_dump_str) {
4256		trace.dump.map = trace__find_bpf_map_by_name(&trace, map_dump_str);
4257		if (trace.dump.map == NULL) {
4258			pr_err("ERROR: BPF map \"%s\" not found\n", map_dump_str);
4259			goto out;
4260		}
4261	}
4262
4263	if (trace.trace_pgfaults) {
4264		trace.opts.sample_address = true;
4265		trace.opts.sample_time = true;
4266	}
4267
4268	if (trace.opts.mmap_pages == UINT_MAX)
4269		mmap_pages_user_set = false;
4270
4271	if (trace.max_stack == UINT_MAX) {
4272		trace.max_stack = input_name ? PERF_MAX_STACK_DEPTH : sysctl__max_stack();
4273		max_stack_user_set = false;
4274	}
4275
4276#ifdef HAVE_DWARF_UNWIND_SUPPORT
4277	if ((trace.min_stack || max_stack_user_set) && !callchain_param.enabled) {
4278		record_opts__parse_callchain(&trace.opts, &callchain_param, "dwarf", false);
4279	}
4280#endif
4281
4282	if (callchain_param.enabled) {
4283		if (!mmap_pages_user_set && geteuid() == 0)
4284			trace.opts.mmap_pages = perf_event_mlock_kb_in_pages() * 4;
4285
4286		symbol_conf.use_callchain = true;
4287	}
4288
4289	if (trace.evlist->core.nr_entries > 0) {
4290		evlist__set_evsel_handler(trace.evlist, trace__event_handler);
4291		if (evlist__set_syscall_tp_fields(trace.evlist)) {
4292			perror("failed to set syscalls:* tracepoint fields");
4293			goto out;
4294		}
4295	}
4296
4297	if (trace.sort_events) {
4298		ordered_events__init(&trace.oe.data, ordered_events__deliver_event, &trace);
4299		ordered_events__set_copy_on_queue(&trace.oe.data, true);
4300	}
4301
4302	/*
4303	 * If we are augmenting syscalls, then combine what we put in the
4304	 * __augmented_syscalls__ BPF map with what is in the
4305	 * syscalls:sys_exit_FOO tracepoints, i.e. just like we do without BPF,
4306	 * combining raw_syscalls:sys_enter with raw_syscalls:sys_exit.
4307	 *
4308	 * We'll switch to look at two BPF maps, one for sys_enter and the
4309	 * other for sys_exit when we start augmenting the sys_exit paths with
4310	 * buffers that are being copied from kernel to userspace, think 'read'
4311	 * syscall.
4312	 */
4313	if (trace.syscalls.events.augmented) {
4314		evlist__for_each_entry(trace.evlist, evsel) {
4315			bool raw_syscalls_sys_exit = strcmp(perf_evsel__name(evsel), "raw_syscalls:sys_exit") == 0;
4316
4317			if (raw_syscalls_sys_exit) {
4318				trace.raw_augmented_syscalls = true;
4319				goto init_augmented_syscall_tp;
4320			}
4321
4322			if (trace.syscalls.events.augmented->priv == NULL &&
4323			    strstr(perf_evsel__name(evsel), "syscalls:sys_enter")) {
4324				struct evsel *augmented = trace.syscalls.events.augmented;
4325				if (perf_evsel__init_augmented_syscall_tp(augmented, evsel) ||
4326				    perf_evsel__init_augmented_syscall_tp_args(augmented))
4327					goto out;
4328				/*
4329				 * Augmented is __augmented_syscalls__ BPF_OUTPUT event
4330				 * Above we made sure we can get from the payload the tp fields
4331				 * that we get from syscalls:sys_enter tracefs format file.
4332				 */
4333				augmented->handler = trace__sys_enter;
4334				/*
4335				 * Now we do the same for the *syscalls:sys_enter event so that
4336				 * if we handle it directly, i.e. if the BPF prog returns 0 so
4337				 * as not to filter it, then we'll handle it just like we would
4338				 * for the BPF_OUTPUT one:
4339				 */
4340				if (perf_evsel__init_augmented_syscall_tp(evsel, evsel) ||
4341				    perf_evsel__init_augmented_syscall_tp_args(evsel))
4342					goto out;
4343				evsel->handler = trace__sys_enter;
4344			}
4345
4346			if (strstarts(perf_evsel__name(evsel), "syscalls:sys_exit_")) {
4347				struct syscall_tp *sc;
4348init_augmented_syscall_tp:
4349				if (perf_evsel__init_augmented_syscall_tp(evsel, evsel))
4350					goto out;
4351				sc = evsel->priv;
4352				/*
4353				 * For now with BPF raw_augmented we hook into
4354				 * raw_syscalls:sys_enter and there we get all
4355				 * 6 syscall args plus the tracepoint common
4356				 * fields and the syscall_nr (another long).
4357				 * So we check if that is the case and if so
4358				 * don't look after the sc->args_size but
4359				 * always after the full raw_syscalls:sys_enter
4360				 * payload, which is fixed.
4361				 *
4362				 * We'll revisit this later to pass
4363				 * s->args_size to the BPF augmenter (now
4364				 * tools/perf/examples/bpf/augmented_raw_syscalls.c,
4365				 * so that it copies only what we need for each
4366				 * syscall, like what happens when we use
4367				 * syscalls:sys_enter_NAME, so that we reduce
4368				 * the kernel/userspace traffic to just what is
4369				 * needed for each syscall.
4370				 */
4371				if (trace.raw_augmented_syscalls)
4372					trace.raw_augmented_syscalls_args_size = (6 + 1) * sizeof(long) + sc->id.offset;
4373				perf_evsel__init_augmented_syscall_tp_ret(evsel);
4374				evsel->handler = trace__sys_exit;
4375			}
4376		}
4377	}
4378
4379	if ((argc >= 1) && (strcmp(argv[0], "record") == 0))
4380		return trace__record(&trace, argc-1, &argv[1]);
4381
 
 
 
 
4382	/* summary_only implies summary option, but don't overwrite summary if set */
4383	if (trace.summary_only)
4384		trace.summary = trace.summary_only;
4385
4386	if (!trace.trace_syscalls && !trace.trace_pgfaults &&
4387	    trace.evlist->core.nr_entries == 0 /* Was --events used? */) {
4388		trace.trace_syscalls = true;
4389	}
4390
4391	if (output_name != NULL) {
4392		err = trace__open_output(&trace, output_name);
4393		if (err < 0) {
4394			perror("failed to create output file");
4395			goto out;
4396		}
4397	}
4398
4399	err = evswitch__init(&trace.evswitch, trace.evlist, stderr);
4400	if (err)
4401		goto out_close;
4402
4403	err = target__validate(&trace.opts.target);
4404	if (err) {
4405		target__strerror(&trace.opts.target, err, bf, sizeof(bf));
4406		fprintf(trace.output, "%s", bf);
4407		goto out_close;
4408	}
4409
4410	err = target__parse_uid(&trace.opts.target);
4411	if (err) {
4412		target__strerror(&trace.opts.target, err, bf, sizeof(bf));
4413		fprintf(trace.output, "%s", bf);
4414		goto out_close;
4415	}
4416
4417	if (!argc && target__none(&trace.opts.target))
4418		trace.opts.target.system_wide = true;
4419
4420	if (input_name)
4421		err = trace__replay(&trace);
4422	else
4423		err = trace__run(&trace, argc, argv);
4424
4425out_close:
4426	if (output_name != NULL)
4427		fclose(trace.output);
4428out:
 
4429	return err;
4430}