5496 lines · c
1/*2 * builtin-trace.c3 *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 other8 * 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 <api/fs/tracing_path.h>19#ifdef HAVE_LIBBPF_SUPPORT20#include <bpf/bpf.h>21#include <bpf/libbpf.h>22#include <bpf/btf.h>23#ifdef HAVE_BPF_SKEL24#include "bpf_skel/augmented_raw_syscalls.skel.h"25#endif26#endif27#include "util/bpf_map.h"28#include "util/rlimit.h"29#include "builtin.h"30#include "util/cgroup.h"31#include "util/color.h"32#include "util/config.h"33#include "util/debug.h"34#include "util/dso.h"35#include "util/env.h"36#include "util/event.h"37#include "util/evsel.h"38#include "util/evsel_fprintf.h"39#include "util/synthetic-events.h"40#include "util/evlist.h"41#include "util/evswitch.h"42#include "util/mmap.h"43#include <subcmd/pager.h>44#include <subcmd/exec-cmd.h>45#include "util/machine.h"46#include "util/map.h"47#include "util/symbol.h"48#include "util/path.h"49#include "util/session.h"50#include "util/thread.h"51#include <subcmd/parse-options.h>52#include "util/strlist.h"53#include "util/intlist.h"54#include "util/thread_map.h"55#include "util/stat.h"56#include "util/tool.h"57#include "util/util.h"58#include "trace/beauty/beauty.h"59#include "trace-event.h"60#include "util/parse-events.h"61#include "util/tracepoint.h"62#include "callchain.h"63#include "print_binary.h"64#include "string2.h"65#include "syscalltbl.h"66#include "rb_resort.h"67#include "../perf.h"68#include "trace_augment.h"69 70#include <errno.h>71#include <inttypes.h>72#include <poll.h>73#include <signal.h>74#include <stdlib.h>75#include <string.h>76#include <linux/err.h>77#include <linux/filter.h>78#include <linux/kernel.h>79#include <linux/list_sort.h>80#include <linux/random.h>81#include <linux/stringify.h>82#include <linux/time64.h>83#include <linux/zalloc.h>84#include <fcntl.h>85#include <sys/sysmacros.h>86 87#include <linux/ctype.h>88#include <perf/mmap.h>89 90#ifdef HAVE_LIBTRACEEVENT91#include <traceevent/event-parse.h>92#endif93 94#ifndef O_CLOEXEC95# define O_CLOEXEC 0200000096#endif97 98#ifndef F_LINUX_SPECIFIC_BASE99# define F_LINUX_SPECIFIC_BASE 1024100#endif101 102#define RAW_SYSCALL_ARGS_NUM 6103 104/*105 * strtoul: Go from a string to a value, i.e. for msr: MSR_FS_BASE to 0xc0000100106 *107 * We have to explicitely mark the direction of the flow of data, if from the108 * kernel to user space or the other way around, since the BPF collector we109 * have so far copies only from user to kernel space, mark the arguments that110 * go that direction, so that we don´t end up collecting the previous contents111 * for syscall args that goes from kernel to user space.112 */113struct syscall_arg_fmt {114 size_t (*scnprintf)(char *bf, size_t size, struct syscall_arg *arg);115 bool (*strtoul)(char *bf, size_t size, struct syscall_arg *arg, u64 *val);116 unsigned long (*mask_val)(struct syscall_arg *arg, unsigned long val);117 void *parm;118 const char *name;119 u16 nr_entries; // for arrays120 bool from_user;121 bool show_zero;122#ifdef HAVE_LIBBPF_SUPPORT123 const struct btf_type *type;124 int type_id; /* used in btf_dump */125#endif126};127 128struct syscall_fmt {129 const char *name;130 const char *alias;131 struct {132 const char *sys_enter,133 *sys_exit;134 } bpf_prog_name;135 struct syscall_arg_fmt arg[RAW_SYSCALL_ARGS_NUM];136 u8 nr_args;137 bool errpid;138 bool timeout;139 bool hexret;140};141 142struct trace {143 struct perf_tool tool;144 struct syscalltbl *sctbl;145 struct {146 struct syscall *table;147 struct {148 struct evsel *sys_enter,149 *sys_exit,150 *bpf_output;151 } events;152 } syscalls;153#ifdef HAVE_BPF_SKEL154 struct augmented_raw_syscalls_bpf *skel;155#endif156#ifdef HAVE_LIBBPF_SUPPORT157 struct btf *btf;158#endif159 struct record_opts opts;160 struct evlist *evlist;161 struct machine *host;162 struct thread *current;163 struct cgroup *cgroup;164 u64 base_time;165 FILE *output;166 unsigned long nr_events;167 unsigned long nr_events_printed;168 unsigned long max_events;169 struct evswitch evswitch;170 struct strlist *ev_qualifier;171 struct {172 size_t nr;173 int *entries;174 } ev_qualifier_ids;175 struct {176 size_t nr;177 pid_t *entries;178 struct bpf_map *map;179 } filter_pids;180 double duration_filter;181 double runtime_ms;182 struct {183 u64 vfs_getname,184 proc_getname;185 } stats;186 unsigned int max_stack;187 unsigned int min_stack;188 int raw_augmented_syscalls_args_size;189 bool raw_augmented_syscalls;190 bool fd_path_disabled;191 bool sort_events;192 bool not_ev_qualifier;193 bool live;194 bool full_time;195 bool sched;196 bool multiple_threads;197 bool summary;198 bool summary_only;199 bool errno_summary;200 bool failure_only;201 bool show_comm;202 bool print_sample;203 bool show_tool_stats;204 bool trace_syscalls;205 bool libtraceevent_print;206 bool kernel_syscallchains;207 s16 args_alignment;208 bool show_tstamp;209 bool show_duration;210 bool show_zeros;211 bool show_arg_names;212 bool show_string_prefix;213 bool force;214 bool vfs_getname;215 bool force_btf;216 int trace_pgfaults;217 char *perfconfig_events;218 struct {219 struct ordered_events data;220 u64 last;221 } oe;222};223 224static void trace__load_vmlinux_btf(struct trace *trace __maybe_unused)225{226#ifdef HAVE_LIBBPF_SUPPORT227 if (trace->btf != NULL)228 return;229 230 trace->btf = btf__load_vmlinux_btf();231 if (verbose > 0) {232 fprintf(trace->output, trace->btf ? "vmlinux BTF loaded\n" :233 "Failed to load vmlinux BTF\n");234 }235#endif236}237 238struct tp_field {239 int offset;240 union {241 u64 (*integer)(struct tp_field *field, struct perf_sample *sample);242 void *(*pointer)(struct tp_field *field, struct perf_sample *sample);243 };244};245 246#define TP_UINT_FIELD(bits) \247static u64 tp_field__u##bits(struct tp_field *field, struct perf_sample *sample) \248{ \249 u##bits value; \250 memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \251 return value; \252}253 254TP_UINT_FIELD(8);255TP_UINT_FIELD(16);256TP_UINT_FIELD(32);257TP_UINT_FIELD(64);258 259#define TP_UINT_FIELD__SWAPPED(bits) \260static u64 tp_field__swapped_u##bits(struct tp_field *field, struct perf_sample *sample) \261{ \262 u##bits value; \263 memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \264 return bswap_##bits(value);\265}266 267TP_UINT_FIELD__SWAPPED(16);268TP_UINT_FIELD__SWAPPED(32);269TP_UINT_FIELD__SWAPPED(64);270 271static int __tp_field__init_uint(struct tp_field *field, int size, int offset, bool needs_swap)272{273 field->offset = offset;274 275 switch (size) {276 case 1:277 field->integer = tp_field__u8;278 break;279 case 2:280 field->integer = needs_swap ? tp_field__swapped_u16 : tp_field__u16;281 break;282 case 4:283 field->integer = needs_swap ? tp_field__swapped_u32 : tp_field__u32;284 break;285 case 8:286 field->integer = needs_swap ? tp_field__swapped_u64 : tp_field__u64;287 break;288 default:289 return -1;290 }291 292 return 0;293}294 295static int tp_field__init_uint(struct tp_field *field, struct tep_format_field *format_field, bool needs_swap)296{297 return __tp_field__init_uint(field, format_field->size, format_field->offset, needs_swap);298}299 300static void *tp_field__ptr(struct tp_field *field, struct perf_sample *sample)301{302 return sample->raw_data + field->offset;303}304 305static int __tp_field__init_ptr(struct tp_field *field, int offset)306{307 field->offset = offset;308 field->pointer = tp_field__ptr;309 return 0;310}311 312static int tp_field__init_ptr(struct tp_field *field, struct tep_format_field *format_field)313{314 return __tp_field__init_ptr(field, format_field->offset);315}316 317struct syscall_tp {318 struct tp_field id;319 union {320 struct tp_field args, ret;321 };322};323 324/*325 * The evsel->priv as used by 'perf trace'326 * sc: for raw_syscalls:sys_{enter,exit} and syscalls:sys_{enter,exit}_SYSCALLNAME327 * fmt: for all the other tracepoints328 */329struct evsel_trace {330 struct syscall_tp sc;331 struct syscall_arg_fmt *fmt;332};333 334static struct evsel_trace *evsel_trace__new(void)335{336 return zalloc(sizeof(struct evsel_trace));337}338 339static void evsel_trace__delete(struct evsel_trace *et)340{341 if (et == NULL)342 return;343 344 zfree(&et->fmt);345 free(et);346}347 348/*349 * Used with raw_syscalls:sys_{enter,exit} and with the350 * syscalls:sys_{enter,exit}_SYSCALL tracepoints351 */352static inline struct syscall_tp *__evsel__syscall_tp(struct evsel *evsel)353{354 struct evsel_trace *et = evsel->priv;355 356 return &et->sc;357}358 359static struct syscall_tp *evsel__syscall_tp(struct evsel *evsel)360{361 if (evsel->priv == NULL) {362 evsel->priv = evsel_trace__new();363 if (evsel->priv == NULL)364 return NULL;365 }366 367 return __evsel__syscall_tp(evsel);368}369 370/*371 * Used with all the other tracepoints.372 */373static inline struct syscall_arg_fmt *__evsel__syscall_arg_fmt(struct evsel *evsel)374{375 struct evsel_trace *et = evsel->priv;376 377 return et->fmt;378}379 380static struct syscall_arg_fmt *evsel__syscall_arg_fmt(struct evsel *evsel)381{382 struct evsel_trace *et = evsel->priv;383 384 if (evsel->priv == NULL) {385 et = evsel->priv = evsel_trace__new();386 387 if (et == NULL)388 return NULL;389 }390 391 if (et->fmt == NULL) {392 et->fmt = calloc(evsel->tp_format->format.nr_fields, sizeof(struct syscall_arg_fmt));393 if (et->fmt == NULL)394 goto out_delete;395 }396 397 return __evsel__syscall_arg_fmt(evsel);398 399out_delete:400 evsel_trace__delete(evsel->priv);401 evsel->priv = NULL;402 return NULL;403}404 405static int evsel__init_tp_uint_field(struct evsel *evsel, struct tp_field *field, const char *name)406{407 struct tep_format_field *format_field = evsel__field(evsel, name);408 409 if (format_field == NULL)410 return -1;411 412 return tp_field__init_uint(field, format_field, evsel->needs_swap);413}414 415#define perf_evsel__init_sc_tp_uint_field(evsel, name) \416 ({ struct syscall_tp *sc = __evsel__syscall_tp(evsel);\417 evsel__init_tp_uint_field(evsel, &sc->name, #name); })418 419static int evsel__init_tp_ptr_field(struct evsel *evsel, struct tp_field *field, const char *name)420{421 struct tep_format_field *format_field = evsel__field(evsel, name);422 423 if (format_field == NULL)424 return -1;425 426 return tp_field__init_ptr(field, format_field);427}428 429#define perf_evsel__init_sc_tp_ptr_field(evsel, name) \430 ({ struct syscall_tp *sc = __evsel__syscall_tp(evsel);\431 evsel__init_tp_ptr_field(evsel, &sc->name, #name); })432 433static void evsel__delete_priv(struct evsel *evsel)434{435 zfree(&evsel->priv);436 evsel__delete(evsel);437}438 439static int evsel__init_syscall_tp(struct evsel *evsel)440{441 struct syscall_tp *sc = evsel__syscall_tp(evsel);442 443 if (sc != NULL) {444 if (evsel__init_tp_uint_field(evsel, &sc->id, "__syscall_nr") &&445 evsel__init_tp_uint_field(evsel, &sc->id, "nr"))446 return -ENOENT;447 448 return 0;449 }450 451 return -ENOMEM;452}453 454static int evsel__init_augmented_syscall_tp(struct evsel *evsel, struct evsel *tp)455{456 struct syscall_tp *sc = evsel__syscall_tp(evsel);457 458 if (sc != NULL) {459 struct tep_format_field *syscall_id = evsel__field(tp, "id");460 if (syscall_id == NULL)461 syscall_id = evsel__field(tp, "__syscall_nr");462 if (syscall_id == NULL ||463 __tp_field__init_uint(&sc->id, syscall_id->size, syscall_id->offset, evsel->needs_swap))464 return -EINVAL;465 466 return 0;467 }468 469 return -ENOMEM;470}471 472static int evsel__init_augmented_syscall_tp_args(struct evsel *evsel)473{474 struct syscall_tp *sc = __evsel__syscall_tp(evsel);475 476 return __tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64));477}478 479static int evsel__init_augmented_syscall_tp_ret(struct evsel *evsel)480{481 struct syscall_tp *sc = __evsel__syscall_tp(evsel);482 483 return __tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap);484}485 486static int evsel__init_raw_syscall_tp(struct evsel *evsel, void *handler)487{488 if (evsel__syscall_tp(evsel) != NULL) {489 if (perf_evsel__init_sc_tp_uint_field(evsel, id))490 return -ENOENT;491 492 evsel->handler = handler;493 return 0;494 }495 496 return -ENOMEM;497}498 499static struct evsel *perf_evsel__raw_syscall_newtp(const char *direction, void *handler)500{501 struct evsel *evsel = evsel__newtp("raw_syscalls", direction);502 503 /* older kernel (e.g., RHEL6) use syscalls:{enter,exit} */504 if (IS_ERR(evsel))505 evsel = evsel__newtp("syscalls", direction);506 507 if (IS_ERR(evsel))508 return NULL;509 510 if (evsel__init_raw_syscall_tp(evsel, handler))511 goto out_delete;512 513 return evsel;514 515out_delete:516 evsel__delete_priv(evsel);517 return NULL;518}519 520#define perf_evsel__sc_tp_uint(evsel, name, sample) \521 ({ struct syscall_tp *fields = __evsel__syscall_tp(evsel); \522 fields->name.integer(&fields->name, sample); })523 524#define perf_evsel__sc_tp_ptr(evsel, name, sample) \525 ({ struct syscall_tp *fields = __evsel__syscall_tp(evsel); \526 fields->name.pointer(&fields->name, sample); })527 528size_t strarray__scnprintf_suffix(struct strarray *sa, char *bf, size_t size, const char *intfmt, bool show_suffix, int val)529{530 int idx = val - sa->offset;531 532 if (idx < 0 || idx >= sa->nr_entries || sa->entries[idx] == NULL) {533 size_t printed = scnprintf(bf, size, intfmt, val);534 if (show_suffix)535 printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sa->prefix);536 return printed;537 }538 539 return scnprintf(bf, size, "%s%s", sa->entries[idx], show_suffix ? sa->prefix : "");540}541 542size_t strarray__scnprintf(struct strarray *sa, char *bf, size_t size, const char *intfmt, bool show_prefix, int val)543{544 int idx = val - sa->offset;545 546 if (idx < 0 || idx >= sa->nr_entries || sa->entries[idx] == NULL) {547 size_t printed = scnprintf(bf, size, intfmt, val);548 if (show_prefix)549 printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sa->prefix);550 return printed;551 }552 553 return scnprintf(bf, size, "%s%s", show_prefix ? sa->prefix : "", sa->entries[idx]);554}555 556static size_t __syscall_arg__scnprintf_strarray(char *bf, size_t size,557 const char *intfmt,558 struct syscall_arg *arg)559{560 return strarray__scnprintf(arg->parm, bf, size, intfmt, arg->show_string_prefix, arg->val);561}562 563static size_t syscall_arg__scnprintf_strarray(char *bf, size_t size,564 struct syscall_arg *arg)565{566 return __syscall_arg__scnprintf_strarray(bf, size, "%d", arg);567}568 569#define SCA_STRARRAY syscall_arg__scnprintf_strarray570 571bool syscall_arg__strtoul_strarray(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)572{573 return strarray__strtoul(arg->parm, bf, size, ret);574}575 576bool syscall_arg__strtoul_strarray_flags(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)577{578 return strarray__strtoul_flags(arg->parm, bf, size, ret);579}580 581bool syscall_arg__strtoul_strarrays(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)582{583 return strarrays__strtoul(arg->parm, bf, size, ret);584}585 586size_t syscall_arg__scnprintf_strarray_flags(char *bf, size_t size, struct syscall_arg *arg)587{588 return strarray__scnprintf_flags(arg->parm, bf, size, arg->show_string_prefix, arg->val);589}590 591size_t strarrays__scnprintf(struct strarrays *sas, char *bf, size_t size, const char *intfmt, bool show_prefix, int val)592{593 size_t printed;594 int i;595 596 for (i = 0; i < sas->nr_entries; ++i) {597 struct strarray *sa = sas->entries[i];598 int idx = val - sa->offset;599 600 if (idx >= 0 && idx < sa->nr_entries) {601 if (sa->entries[idx] == NULL)602 break;603 return scnprintf(bf, size, "%s%s", show_prefix ? sa->prefix : "", sa->entries[idx]);604 }605 }606 607 printed = scnprintf(bf, size, intfmt, val);608 if (show_prefix)609 printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sas->entries[0]->prefix);610 return printed;611}612 613bool strarray__strtoul(struct strarray *sa, char *bf, size_t size, u64 *ret)614{615 int i;616 617 for (i = 0; i < sa->nr_entries; ++i) {618 if (sa->entries[i] && strncmp(sa->entries[i], bf, size) == 0 && sa->entries[i][size] == '\0') {619 *ret = sa->offset + i;620 return true;621 }622 }623 624 return false;625}626 627bool strarray__strtoul_flags(struct strarray *sa, char *bf, size_t size, u64 *ret)628{629 u64 val = 0;630 char *tok = bf, *sep, *end;631 632 *ret = 0;633 634 while (size != 0) {635 int toklen = size;636 637 sep = memchr(tok, '|', size);638 if (sep != NULL) {639 size -= sep - tok + 1;640 641 end = sep - 1;642 while (end > tok && isspace(*end))643 --end;644 645 toklen = end - tok + 1;646 }647 648 while (isspace(*tok))649 ++tok;650 651 if (isalpha(*tok) || *tok == '_') {652 if (!strarray__strtoul(sa, tok, toklen, &val))653 return false;654 } else655 val = strtoul(tok, NULL, 0);656 657 *ret |= (1 << (val - 1));658 659 if (sep == NULL)660 break;661 tok = sep + 1;662 }663 664 return true;665}666 667bool strarrays__strtoul(struct strarrays *sas, char *bf, size_t size, u64 *ret)668{669 int i;670 671 for (i = 0; i < sas->nr_entries; ++i) {672 struct strarray *sa = sas->entries[i];673 674 if (strarray__strtoul(sa, bf, size, ret))675 return true;676 }677 678 return false;679}680 681size_t syscall_arg__scnprintf_strarrays(char *bf, size_t size,682 struct syscall_arg *arg)683{684 return strarrays__scnprintf(arg->parm, bf, size, "%d", arg->show_string_prefix, arg->val);685}686 687#ifndef AT_FDCWD688#define AT_FDCWD -100689#endif690 691static size_t syscall_arg__scnprintf_fd_at(char *bf, size_t size,692 struct syscall_arg *arg)693{694 int fd = arg->val;695 const char *prefix = "AT_FD";696 697 if (fd == AT_FDCWD)698 return scnprintf(bf, size, "%s%s", arg->show_string_prefix ? prefix : "", "CWD");699 700 return syscall_arg__scnprintf_fd(bf, size, arg);701}702 703#define SCA_FDAT syscall_arg__scnprintf_fd_at704 705static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,706 struct syscall_arg *arg);707 708#define SCA_CLOSE_FD syscall_arg__scnprintf_close_fd709 710size_t syscall_arg__scnprintf_hex(char *bf, size_t size, struct syscall_arg *arg)711{712 return scnprintf(bf, size, "%#lx", arg->val);713}714 715size_t syscall_arg__scnprintf_ptr(char *bf, size_t size, struct syscall_arg *arg)716{717 if (arg->val == 0)718 return scnprintf(bf, size, "NULL");719 return syscall_arg__scnprintf_hex(bf, size, arg);720}721 722size_t syscall_arg__scnprintf_int(char *bf, size_t size, struct syscall_arg *arg)723{724 return scnprintf(bf, size, "%d", arg->val);725}726 727size_t syscall_arg__scnprintf_long(char *bf, size_t size, struct syscall_arg *arg)728{729 return scnprintf(bf, size, "%ld", arg->val);730}731 732static size_t syscall_arg__scnprintf_char_array(char *bf, size_t size, struct syscall_arg *arg)733{734 // XXX Hey, maybe for sched:sched_switch prev/next comm fields we can735 // fill missing comms using thread__set_comm()...736 // here or in a special syscall_arg__scnprintf_pid_sched_tp...737 return scnprintf(bf, size, "\"%-.*s\"", arg->fmt->nr_entries ?: arg->len, arg->val);738}739 740#define SCA_CHAR_ARRAY syscall_arg__scnprintf_char_array741 742static const char *bpf_cmd[] = {743 "MAP_CREATE", "MAP_LOOKUP_ELEM", "MAP_UPDATE_ELEM", "MAP_DELETE_ELEM",744 "MAP_GET_NEXT_KEY", "PROG_LOAD", "OBJ_PIN", "OBJ_GET", "PROG_ATTACH",745 "PROG_DETACH", "PROG_TEST_RUN", "PROG_GET_NEXT_ID", "MAP_GET_NEXT_ID",746 "PROG_GET_FD_BY_ID", "MAP_GET_FD_BY_ID", "OBJ_GET_INFO_BY_FD",747 "PROG_QUERY", "RAW_TRACEPOINT_OPEN", "BTF_LOAD", "BTF_GET_FD_BY_ID",748 "TASK_FD_QUERY", "MAP_LOOKUP_AND_DELETE_ELEM", "MAP_FREEZE",749 "BTF_GET_NEXT_ID", "MAP_LOOKUP_BATCH", "MAP_LOOKUP_AND_DELETE_BATCH",750 "MAP_UPDATE_BATCH", "MAP_DELETE_BATCH", "LINK_CREATE", "LINK_UPDATE",751 "LINK_GET_FD_BY_ID", "LINK_GET_NEXT_ID", "ENABLE_STATS", "ITER_CREATE",752 "LINK_DETACH", "PROG_BIND_MAP",753};754static DEFINE_STRARRAY(bpf_cmd, "BPF_");755 756static const char *fsmount_flags[] = {757 [1] = "CLOEXEC",758};759static DEFINE_STRARRAY(fsmount_flags, "FSMOUNT_");760 761#include "trace/beauty/generated/fsconfig_arrays.c"762 763static DEFINE_STRARRAY(fsconfig_cmds, "FSCONFIG_");764 765static const char *epoll_ctl_ops[] = { "ADD", "DEL", "MOD", };766static DEFINE_STRARRAY_OFFSET(epoll_ctl_ops, "EPOLL_CTL_", 1);767 768static const char *itimers[] = { "REAL", "VIRTUAL", "PROF", };769static DEFINE_STRARRAY(itimers, "ITIMER_");770 771static const char *keyctl_options[] = {772 "GET_KEYRING_ID", "JOIN_SESSION_KEYRING", "UPDATE", "REVOKE", "CHOWN",773 "SETPERM", "DESCRIBE", "CLEAR", "LINK", "UNLINK", "SEARCH", "READ",774 "INSTANTIATE", "NEGATE", "SET_REQKEY_KEYRING", "SET_TIMEOUT",775 "ASSUME_AUTHORITY", "GET_SECURITY", "SESSION_TO_PARENT", "REJECT",776 "INSTANTIATE_IOV", "INVALIDATE", "GET_PERSISTENT",777};778static DEFINE_STRARRAY(keyctl_options, "KEYCTL_");779 780static const char *whences[] = { "SET", "CUR", "END",781#ifdef SEEK_DATA782"DATA",783#endif784#ifdef SEEK_HOLE785"HOLE",786#endif787};788static DEFINE_STRARRAY(whences, "SEEK_");789 790static const char *fcntl_cmds[] = {791 "DUPFD", "GETFD", "SETFD", "GETFL", "SETFL", "GETLK", "SETLK",792 "SETLKW", "SETOWN", "GETOWN", "SETSIG", "GETSIG", "GETLK64",793 "SETLK64", "SETLKW64", "SETOWN_EX", "GETOWN_EX",794 "GETOWNER_UIDS",795};796static DEFINE_STRARRAY(fcntl_cmds, "F_");797 798static const char *fcntl_linux_specific_cmds[] = {799 "SETLEASE", "GETLEASE", "NOTIFY", "DUPFD_QUERY", [5] = "CANCELLK", "DUPFD_CLOEXEC",800 "SETPIPE_SZ", "GETPIPE_SZ", "ADD_SEALS", "GET_SEALS",801 "GET_RW_HINT", "SET_RW_HINT", "GET_FILE_RW_HINT", "SET_FILE_RW_HINT",802};803 804static DEFINE_STRARRAY_OFFSET(fcntl_linux_specific_cmds, "F_", F_LINUX_SPECIFIC_BASE);805 806static struct strarray *fcntl_cmds_arrays[] = {807 &strarray__fcntl_cmds,808 &strarray__fcntl_linux_specific_cmds,809};810 811static DEFINE_STRARRAYS(fcntl_cmds_arrays);812 813static const char *rlimit_resources[] = {814 "CPU", "FSIZE", "DATA", "STACK", "CORE", "RSS", "NPROC", "NOFILE",815 "MEMLOCK", "AS", "LOCKS", "SIGPENDING", "MSGQUEUE", "NICE", "RTPRIO",816 "RTTIME",817};818static DEFINE_STRARRAY(rlimit_resources, "RLIMIT_");819 820static const char *sighow[] = { "BLOCK", "UNBLOCK", "SETMASK", };821static DEFINE_STRARRAY(sighow, "SIG_");822 823static const char *clockid[] = {824 "REALTIME", "MONOTONIC", "PROCESS_CPUTIME_ID", "THREAD_CPUTIME_ID",825 "MONOTONIC_RAW", "REALTIME_COARSE", "MONOTONIC_COARSE", "BOOTTIME",826 "REALTIME_ALARM", "BOOTTIME_ALARM", "SGI_CYCLE", "TAI"827};828static DEFINE_STRARRAY(clockid, "CLOCK_");829 830static size_t syscall_arg__scnprintf_access_mode(char *bf, size_t size,831 struct syscall_arg *arg)832{833 bool show_prefix = arg->show_string_prefix;834 const char *suffix = "_OK";835 size_t printed = 0;836 int mode = arg->val;837 838 if (mode == F_OK) /* 0 */839 return scnprintf(bf, size, "F%s", show_prefix ? suffix : "");840#define P_MODE(n) \841 if (mode & n##_OK) { \842 printed += scnprintf(bf + printed, size - printed, "%s%s", #n, show_prefix ? suffix : ""); \843 mode &= ~n##_OK; \844 }845 846 P_MODE(R);847 P_MODE(W);848 P_MODE(X);849#undef P_MODE850 851 if (mode)852 printed += scnprintf(bf + printed, size - printed, "|%#x", mode);853 854 return printed;855}856 857#define SCA_ACCMODE syscall_arg__scnprintf_access_mode858 859static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,860 struct syscall_arg *arg);861 862#define SCA_FILENAME syscall_arg__scnprintf_filename863 864// 'argname' is just documentational at this point, to remove the previous comment with that info865#define SCA_FILENAME_FROM_USER(argname) \866 { .scnprintf = SCA_FILENAME, \867 .from_user = true, }868 869static size_t syscall_arg__scnprintf_buf(char *bf, size_t size, struct syscall_arg *arg);870 871#define SCA_BUF syscall_arg__scnprintf_buf872 873static size_t syscall_arg__scnprintf_pipe_flags(char *bf, size_t size,874 struct syscall_arg *arg)875{876 bool show_prefix = arg->show_string_prefix;877 const char *prefix = "O_";878 int printed = 0, flags = arg->val;879 880#define P_FLAG(n) \881 if (flags & O_##n) { \882 printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \883 flags &= ~O_##n; \884 }885 886 P_FLAG(CLOEXEC);887 P_FLAG(NONBLOCK);888#undef P_FLAG889 890 if (flags)891 printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);892 893 return printed;894}895 896#define SCA_PIPE_FLAGS syscall_arg__scnprintf_pipe_flags897 898#ifndef GRND_NONBLOCK899#define GRND_NONBLOCK 0x0001900#endif901#ifndef GRND_RANDOM902#define GRND_RANDOM 0x0002903#endif904 905static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,906 struct syscall_arg *arg)907{908 bool show_prefix = arg->show_string_prefix;909 const char *prefix = "GRND_";910 int printed = 0, flags = arg->val;911 912#define P_FLAG(n) \913 if (flags & GRND_##n) { \914 printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \915 flags &= ~GRND_##n; \916 }917 918 P_FLAG(RANDOM);919 P_FLAG(NONBLOCK);920#undef P_FLAG921 922 if (flags)923 printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);924 925 return printed;926}927 928#define SCA_GETRANDOM_FLAGS syscall_arg__scnprintf_getrandom_flags929 930#ifdef HAVE_LIBBPF_SUPPORT931static void syscall_arg_fmt__cache_btf_enum(struct syscall_arg_fmt *arg_fmt, struct btf *btf, char *type)932{933 int id;934 935 type = strstr(type, "enum ");936 if (type == NULL)937 return;938 939 type += 5; // skip "enum " to get the enumeration name940 941 id = btf__find_by_name(btf, type);942 if (id < 0)943 return;944 945 arg_fmt->type = btf__type_by_id(btf, id);946}947 948static bool syscall_arg__strtoul_btf_enum(char *bf, size_t size, struct syscall_arg *arg, u64 *val)949{950 const struct btf_type *bt = arg->fmt->type;951 struct btf *btf = arg->trace->btf;952 struct btf_enum *be = btf_enum(bt);953 954 for (int i = 0; i < btf_vlen(bt); ++i, ++be) {955 const char *name = btf__name_by_offset(btf, be->name_off);956 int max_len = max(size, strlen(name));957 958 if (strncmp(name, bf, max_len) == 0) {959 *val = be->val;960 return true;961 }962 }963 964 return false;965}966 967static bool syscall_arg__strtoul_btf_type(char *bf, size_t size, struct syscall_arg *arg, u64 *val)968{969 const struct btf_type *bt;970 char *type = arg->type_name;971 struct btf *btf;972 973 trace__load_vmlinux_btf(arg->trace);974 975 btf = arg->trace->btf;976 if (btf == NULL)977 return false;978 979 if (arg->fmt->type == NULL) {980 // See if this is an enum981 syscall_arg_fmt__cache_btf_enum(arg->fmt, btf, type);982 }983 984 // Now let's see if we have a BTF type resolved985 bt = arg->fmt->type;986 if (bt == NULL)987 return false;988 989 // If it is an enum:990 if (btf_is_enum(arg->fmt->type))991 return syscall_arg__strtoul_btf_enum(bf, size, arg, val);992 993 return false;994}995 996static size_t btf_enum_scnprintf(const struct btf_type *type, struct btf *btf, char *bf, size_t size, int val)997{998 struct btf_enum *be = btf_enum(type);999 const int nr_entries = btf_vlen(type);1000 1001 for (int i = 0; i < nr_entries; ++i, ++be) {1002 if (be->val == val) {1003 return scnprintf(bf, size, "%s",1004 btf__name_by_offset(btf, be->name_off));1005 }1006 }1007 1008 return 0;1009}1010 1011struct trace_btf_dump_snprintf_ctx {1012 char *bf;1013 size_t printed, size;1014};1015 1016static void trace__btf_dump_snprintf(void *vctx, const char *fmt, va_list args)1017{1018 struct trace_btf_dump_snprintf_ctx *ctx = vctx;1019 1020 ctx->printed += vscnprintf(ctx->bf + ctx->printed, ctx->size - ctx->printed, fmt, args);1021}1022 1023static size_t btf_struct_scnprintf(const struct btf_type *type, struct btf *btf, char *bf, size_t size, struct syscall_arg *arg)1024{1025 struct trace_btf_dump_snprintf_ctx ctx = {1026 .bf = bf,1027 .size = size,1028 };1029 struct augmented_arg *augmented_arg = arg->augmented.args;1030 int type_id = arg->fmt->type_id, consumed;1031 struct btf_dump *btf_dump;1032 1033 LIBBPF_OPTS(btf_dump_opts, dump_opts);1034 LIBBPF_OPTS(btf_dump_type_data_opts, dump_data_opts);1035 1036 if (arg == NULL || arg->augmented.args == NULL)1037 return 0;1038 1039 dump_data_opts.compact = true;1040 dump_data_opts.skip_names = !arg->trace->show_arg_names;1041 1042 btf_dump = btf_dump__new(btf, trace__btf_dump_snprintf, &ctx, &dump_opts);1043 if (btf_dump == NULL)1044 return 0;1045 1046 /* pretty print the struct data here */1047 if (btf_dump__dump_type_data(btf_dump, type_id, arg->augmented.args->value, type->size, &dump_data_opts) == 0)1048 return 0;1049 1050 consumed = sizeof(*augmented_arg) + augmented_arg->size;1051 arg->augmented.args = ((void *)arg->augmented.args) + consumed;1052 arg->augmented.size -= consumed;1053 1054 btf_dump__free(btf_dump);1055 1056 return ctx.printed;1057}1058 1059static size_t trace__btf_scnprintf(struct trace *trace, struct syscall_arg *arg, char *bf,1060 size_t size, int val, char *type)1061{1062 struct syscall_arg_fmt *arg_fmt = arg->fmt;1063 1064 if (trace->btf == NULL)1065 return 0;1066 1067 if (arg_fmt->type == NULL) {1068 // Check if this is an enum and if we have the BTF type for it.1069 syscall_arg_fmt__cache_btf_enum(arg_fmt, trace->btf, type);1070 }1071 1072 // Did we manage to find a BTF type for the syscall/tracepoint argument?1073 if (arg_fmt->type == NULL)1074 return 0;1075 1076 if (btf_is_enum(arg_fmt->type))1077 return btf_enum_scnprintf(arg_fmt->type, trace->btf, bf, size, val);1078 else if (btf_is_struct(arg_fmt->type) || btf_is_union(arg_fmt->type))1079 return btf_struct_scnprintf(arg_fmt->type, trace->btf, bf, size, arg);1080 1081 return 0;1082}1083 1084#else // HAVE_LIBBPF_SUPPORT1085static size_t trace__btf_scnprintf(struct trace *trace __maybe_unused, struct syscall_arg *arg __maybe_unused,1086 char *bf __maybe_unused, size_t size __maybe_unused, int val __maybe_unused,1087 char *type __maybe_unused)1088{1089 return 0;1090}1091 1092static bool syscall_arg__strtoul_btf_type(char *bf __maybe_unused, size_t size __maybe_unused,1093 struct syscall_arg *arg __maybe_unused, u64 *val __maybe_unused)1094{1095 return false;1096}1097#endif // HAVE_LIBBPF_SUPPORT1098 1099#define STUL_BTF_TYPE syscall_arg__strtoul_btf_type1100 1101#define STRARRAY(name, array) \1102 { .scnprintf = SCA_STRARRAY, \1103 .strtoul = STUL_STRARRAY, \1104 .parm = &strarray__##array, }1105 1106#define STRARRAY_FLAGS(name, array) \1107 { .scnprintf = SCA_STRARRAY_FLAGS, \1108 .strtoul = STUL_STRARRAY_FLAGS, \1109 .parm = &strarray__##array, }1110 1111#include "trace/beauty/arch_errno_names.c"1112#include "trace/beauty/eventfd.c"1113#include "trace/beauty/futex_op.c"1114#include "trace/beauty/futex_val3.c"1115#include "trace/beauty/mmap.c"1116#include "trace/beauty/mode_t.c"1117#include "trace/beauty/msg_flags.c"1118#include "trace/beauty/open_flags.c"1119#include "trace/beauty/perf_event_open.c"1120#include "trace/beauty/pid.c"1121#include "trace/beauty/sched_policy.c"1122#include "trace/beauty/seccomp.c"1123#include "trace/beauty/signum.c"1124#include "trace/beauty/socket_type.c"1125#include "trace/beauty/waitid_options.c"1126 1127static const struct syscall_fmt syscall_fmts[] = {1128 { .name = "access",1129 .arg = { [1] = { .scnprintf = SCA_ACCMODE, /* mode */ }, }, },1130 { .name = "arch_prctl",1131 .arg = { [0] = { .scnprintf = SCA_X86_ARCH_PRCTL_CODE, /* code */ },1132 [1] = { .scnprintf = SCA_PTR, /* arg2 */ }, }, },1133 { .name = "bind",1134 .arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },1135 [1] = SCA_SOCKADDR_FROM_USER(umyaddr),1136 [2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },1137 { .name = "bpf",1138 .arg = { [0] = STRARRAY(cmd, bpf_cmd),1139 [1] = { .from_user = true /* attr */, }, } },1140 { .name = "brk", .hexret = true,1141 .arg = { [0] = { .scnprintf = SCA_PTR, /* brk */ }, }, },1142 { .name = "clock_gettime",1143 .arg = { [0] = STRARRAY(clk_id, clockid), }, },1144 { .name = "clock_nanosleep",1145 .arg = { [2] = SCA_TIMESPEC_FROM_USER(req), }, },1146 { .name = "clone", .errpid = true, .nr_args = 5,1147 .arg = { [0] = { .name = "flags", .scnprintf = SCA_CLONE_FLAGS, },1148 [1] = { .name = "child_stack", .scnprintf = SCA_HEX, },1149 [2] = { .name = "parent_tidptr", .scnprintf = SCA_HEX, },1150 [3] = { .name = "child_tidptr", .scnprintf = SCA_HEX, },1151 [4] = { .name = "tls", .scnprintf = SCA_HEX, }, }, },1152 { .name = "close",1153 .arg = { [0] = { .scnprintf = SCA_CLOSE_FD, /* fd */ }, }, },1154 { .name = "connect",1155 .arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },1156 [1] = SCA_SOCKADDR_FROM_USER(servaddr),1157 [2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },1158 { .name = "epoll_ctl",1159 .arg = { [1] = STRARRAY(op, epoll_ctl_ops), }, },1160 { .name = "eventfd2",1161 .arg = { [1] = { .scnprintf = SCA_EFD_FLAGS, /* flags */ }, }, },1162 { .name = "faccessat",1163 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ },1164 [1] = SCA_FILENAME_FROM_USER(pathname),1165 [2] = { .scnprintf = SCA_ACCMODE, /* mode */ }, }, },1166 { .name = "faccessat2",1167 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ },1168 [1] = SCA_FILENAME_FROM_USER(pathname),1169 [2] = { .scnprintf = SCA_ACCMODE, /* mode */ },1170 [3] = { .scnprintf = SCA_FACCESSAT2_FLAGS, /* flags */ }, }, },1171 { .name = "fchmodat",1172 .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },1173 { .name = "fchownat",1174 .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },1175 { .name = "fcntl",1176 .arg = { [1] = { .scnprintf = SCA_FCNTL_CMD, /* cmd */1177 .strtoul = STUL_STRARRAYS,1178 .parm = &strarrays__fcntl_cmds_arrays,1179 .show_zero = true, },1180 [2] = { .scnprintf = SCA_FCNTL_ARG, /* arg */ }, }, },1181 { .name = "flock",1182 .arg = { [1] = { .scnprintf = SCA_FLOCK, /* cmd */ }, }, },1183 { .name = "fsconfig",1184 .arg = { [1] = STRARRAY(cmd, fsconfig_cmds), }, },1185 { .name = "fsmount",1186 .arg = { [1] = STRARRAY_FLAGS(flags, fsmount_flags),1187 [2] = { .scnprintf = SCA_FSMOUNT_ATTR_FLAGS, /* attr_flags */ }, }, },1188 { .name = "fspick",1189 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },1190 [1] = SCA_FILENAME_FROM_USER(path),1191 [2] = { .scnprintf = SCA_FSPICK_FLAGS, /* flags */ }, }, },1192 { .name = "fstat", .alias = "newfstat", },1193 { .name = "futex",1194 .arg = { [1] = { .scnprintf = SCA_FUTEX_OP, /* op */ },1195 [5] = { .scnprintf = SCA_FUTEX_VAL3, /* val3 */ }, }, },1196 { .name = "futimesat",1197 .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },1198 { .name = "getitimer",1199 .arg = { [0] = STRARRAY(which, itimers), }, },1200 { .name = "getpid", .errpid = true, },1201 { .name = "getpgid", .errpid = true, },1202 { .name = "getppid", .errpid = true, },1203 { .name = "getrandom",1204 .arg = { [2] = { .scnprintf = SCA_GETRANDOM_FLAGS, /* flags */ }, }, },1205 { .name = "getrlimit",1206 .arg = { [0] = STRARRAY(resource, rlimit_resources), }, },1207 { .name = "getsockopt",1208 .arg = { [1] = STRARRAY(level, socket_level), }, },1209 { .name = "gettid", .errpid = true, },1210 { .name = "ioctl",1211 .arg = {1212#if defined(__i386__) || defined(__x86_64__)1213/*1214 * FIXME: Make this available to all arches.1215 */1216 [1] = { .scnprintf = SCA_IOCTL_CMD, /* cmd */ },1217 [2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },1218#else1219 [2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },1220#endif1221 { .name = "kcmp", .nr_args = 5,1222 .arg = { [0] = { .name = "pid1", .scnprintf = SCA_PID, },1223 [1] = { .name = "pid2", .scnprintf = SCA_PID, },1224 [2] = { .name = "type", .scnprintf = SCA_KCMP_TYPE, },1225 [3] = { .name = "idx1", .scnprintf = SCA_KCMP_IDX, },1226 [4] = { .name = "idx2", .scnprintf = SCA_KCMP_IDX, }, }, },1227 { .name = "keyctl",1228 .arg = { [0] = STRARRAY(option, keyctl_options), }, },1229 { .name = "kill",1230 .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },1231 { .name = "linkat",1232 .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },1233 { .name = "lseek",1234 .arg = { [2] = STRARRAY(whence, whences), }, },1235 { .name = "lstat", .alias = "newlstat", },1236 { .name = "madvise",1237 .arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },1238 [2] = { .scnprintf = SCA_MADV_BHV, /* behavior */ }, }, },1239 { .name = "mkdirat",1240 .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },1241 { .name = "mknodat",1242 .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },1243 { .name = "mmap", .hexret = true,1244/* The standard mmap maps to old_mmap on s390x */1245#if defined(__s390x__)1246 .alias = "old_mmap",1247#endif1248 .arg = { [2] = { .scnprintf = SCA_MMAP_PROT, .show_zero = true, /* prot */ },1249 [3] = { .scnprintf = SCA_MMAP_FLAGS, /* flags */1250 .strtoul = STUL_STRARRAY_FLAGS,1251 .parm = &strarray__mmap_flags, },1252 [5] = { .scnprintf = SCA_HEX, /* offset */ }, }, },1253 { .name = "mount",1254 .arg = { [0] = SCA_FILENAME_FROM_USER(devname),1255 [3] = { .scnprintf = SCA_MOUNT_FLAGS, /* flags */1256 .mask_val = SCAMV_MOUNT_FLAGS, /* flags */ }, }, },1257 { .name = "move_mount",1258 .arg = { [0] = { .scnprintf = SCA_FDAT, /* from_dfd */ },1259 [1] = SCA_FILENAME_FROM_USER(pathname),1260 [2] = { .scnprintf = SCA_FDAT, /* to_dfd */ },1261 [3] = SCA_FILENAME_FROM_USER(pathname),1262 [4] = { .scnprintf = SCA_MOVE_MOUNT_FLAGS, /* flags */ }, }, },1263 { .name = "mprotect",1264 .arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },1265 [2] = { .scnprintf = SCA_MMAP_PROT, .show_zero = true, /* prot */ }, }, },1266 { .name = "mq_unlink",1267 .arg = { [0] = SCA_FILENAME_FROM_USER(u_name), }, },1268 { .name = "mremap", .hexret = true,1269 .arg = { [3] = { .scnprintf = SCA_MREMAP_FLAGS, /* flags */ }, }, },1270 { .name = "name_to_handle_at",1271 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },1272 { .name = "nanosleep",1273 .arg = { [0] = SCA_TIMESPEC_FROM_USER(req), }, },1274 { .name = "newfstatat", .alias = "fstatat",1275 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ },1276 [1] = SCA_FILENAME_FROM_USER(pathname),1277 [3] = { .scnprintf = SCA_FS_AT_FLAGS, /* flags */ }, }, },1278 { .name = "open",1279 .arg = { [1] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },1280 { .name = "open_by_handle_at",1281 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },1282 [2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },1283 { .name = "openat",1284 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },1285 [2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },1286 { .name = "perf_event_open",1287 .arg = { [0] = SCA_PERF_ATTR_FROM_USER(attr),1288 [2] = { .scnprintf = SCA_INT, /* cpu */ },1289 [3] = { .scnprintf = SCA_FD, /* group_fd */ },1290 [4] = { .scnprintf = SCA_PERF_FLAGS, /* flags */ }, }, },1291 { .name = "pipe2",1292 .arg = { [1] = { .scnprintf = SCA_PIPE_FLAGS, /* flags */ }, }, },1293 { .name = "pkey_alloc",1294 .arg = { [1] = { .scnprintf = SCA_PKEY_ALLOC_ACCESS_RIGHTS, /* access_rights */ }, }, },1295 { .name = "pkey_free",1296 .arg = { [0] = { .scnprintf = SCA_INT, /* key */ }, }, },1297 { .name = "pkey_mprotect",1298 .arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },1299 [2] = { .scnprintf = SCA_MMAP_PROT, .show_zero = true, /* prot */ },1300 [3] = { .scnprintf = SCA_INT, /* pkey */ }, }, },1301 { .name = "poll", .timeout = true, },1302 { .name = "ppoll", .timeout = true, },1303 { .name = "prctl",1304 .arg = { [0] = { .scnprintf = SCA_PRCTL_OPTION, /* option */1305 .strtoul = STUL_STRARRAY,1306 .parm = &strarray__prctl_options, },1307 [1] = { .scnprintf = SCA_PRCTL_ARG2, /* arg2 */ },1308 [2] = { .scnprintf = SCA_PRCTL_ARG3, /* arg3 */ }, }, },1309 { .name = "pread", .alias = "pread64", },1310 { .name = "preadv", .alias = "pread", },1311 { .name = "prlimit64",1312 .arg = { [1] = STRARRAY(resource, rlimit_resources),1313 [2] = { .from_user = true /* new_rlim */, }, }, },1314 { .name = "pwrite", .alias = "pwrite64", },1315 { .name = "readlinkat",1316 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },1317 { .name = "recvfrom",1318 .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },1319 { .name = "recvmmsg",1320 .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },1321 { .name = "recvmsg",1322 .arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },1323 { .name = "renameat",1324 .arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },1325 [2] = { .scnprintf = SCA_FDAT, /* newdirfd */ }, }, },1326 { .name = "renameat2",1327 .arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },1328 [2] = { .scnprintf = SCA_FDAT, /* newdirfd */ },1329 [4] = { .scnprintf = SCA_RENAMEAT2_FLAGS, /* flags */ }, }, },1330 { .name = "rseq", .errpid = true,1331 .arg = { [0] = { .from_user = true /* rseq */, }, }, },1332 { .name = "rt_sigaction",1333 .arg = { [0] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },1334 { .name = "rt_sigprocmask",1335 .arg = { [0] = STRARRAY(how, sighow), }, },1336 { .name = "rt_sigqueueinfo",1337 .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },1338 { .name = "rt_tgsigqueueinfo",1339 .arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },1340 { .name = "sched_setscheduler",1341 .arg = { [1] = { .scnprintf = SCA_SCHED_POLICY, /* policy */ }, }, },1342 { .name = "seccomp",1343 .arg = { [0] = { .scnprintf = SCA_SECCOMP_OP, /* op */ },1344 [1] = { .scnprintf = SCA_SECCOMP_FLAGS, /* flags */ }, }, },1345 { .name = "select", .timeout = true, },1346 { .name = "sendfile", .alias = "sendfile64", },1347 { .name = "sendmmsg",1348 .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },1349 { .name = "sendmsg",1350 .arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },1351 { .name = "sendto",1352 .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ },1353 [4] = SCA_SOCKADDR_FROM_USER(addr), }, },1354 { .name = "set_robust_list", .errpid = true,1355 .arg = { [0] = { .from_user = true /* head */, }, }, },1356 { .name = "set_tid_address", .errpid = true, },1357 { .name = "setitimer",1358 .arg = { [0] = STRARRAY(which, itimers), }, },1359 { .name = "setrlimit",1360 .arg = { [0] = STRARRAY(resource, rlimit_resources),1361 [1] = { .from_user = true /* rlim */, }, }, },1362 { .name = "setsockopt",1363 .arg = { [1] = STRARRAY(level, socket_level), }, },1364 { .name = "socket",1365 .arg = { [0] = STRARRAY(family, socket_families),1366 [1] = { .scnprintf = SCA_SK_TYPE, /* type */ },1367 [2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },1368 { .name = "socketpair",1369 .arg = { [0] = STRARRAY(family, socket_families),1370 [1] = { .scnprintf = SCA_SK_TYPE, /* type */ },1371 [2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },1372 { .name = "stat", .alias = "newstat", },1373 { .name = "statx",1374 .arg = { [0] = { .scnprintf = SCA_FDAT, /* fdat */ },1375 [2] = { .scnprintf = SCA_FS_AT_FLAGS, /* flags */ } ,1376 [3] = { .scnprintf = SCA_STATX_MASK, /* mask */ }, }, },1377 { .name = "swapoff",1378 .arg = { [0] = SCA_FILENAME_FROM_USER(specialfile), }, },1379 { .name = "swapon",1380 .arg = { [0] = SCA_FILENAME_FROM_USER(specialfile), }, },1381 { .name = "symlinkat",1382 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },1383 { .name = "sync_file_range",1384 .arg = { [3] = { .scnprintf = SCA_SYNC_FILE_RANGE_FLAGS, /* flags */ }, }, },1385 { .name = "tgkill",1386 .arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },1387 { .name = "tkill",1388 .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },1389 { .name = "umount2", .alias = "umount",1390 .arg = { [0] = SCA_FILENAME_FROM_USER(name), }, },1391 { .name = "uname", .alias = "newuname", },1392 { .name = "unlinkat",1393 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },1394 [1] = SCA_FILENAME_FROM_USER(pathname),1395 [2] = { .scnprintf = SCA_FS_AT_FLAGS, /* flags */ }, }, },1396 { .name = "utimensat",1397 .arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ }, }, },1398 { .name = "wait4", .errpid = true,1399 .arg = { [2] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },1400 { .name = "waitid", .errpid = true,1401 .arg = { [3] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },1402 { .name = "write",1403 .arg = { [1] = { .scnprintf = SCA_BUF /* buf */, .from_user = true, }, }, },1404};1405 1406static int syscall_fmt__cmp(const void *name, const void *fmtp)1407{1408 const struct syscall_fmt *fmt = fmtp;1409 return strcmp(name, fmt->name);1410}1411 1412static const struct syscall_fmt *__syscall_fmt__find(const struct syscall_fmt *fmts,1413 const int nmemb,1414 const char *name)1415{1416 return bsearch(name, fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);1417}1418 1419static const struct syscall_fmt *syscall_fmt__find(const char *name)1420{1421 const int nmemb = ARRAY_SIZE(syscall_fmts);1422 return __syscall_fmt__find(syscall_fmts, nmemb, name);1423}1424 1425static const struct syscall_fmt *__syscall_fmt__find_by_alias(const struct syscall_fmt *fmts,1426 const int nmemb, const char *alias)1427{1428 int i;1429 1430 for (i = 0; i < nmemb; ++i) {1431 if (fmts[i].alias && strcmp(fmts[i].alias, alias) == 0)1432 return &fmts[i];1433 }1434 1435 return NULL;1436}1437 1438static const struct syscall_fmt *syscall_fmt__find_by_alias(const char *alias)1439{1440 const int nmemb = ARRAY_SIZE(syscall_fmts);1441 return __syscall_fmt__find_by_alias(syscall_fmts, nmemb, alias);1442}1443 1444/*1445 * is_exit: is this "exit" or "exit_group"?1446 * is_open: is this "open" or "openat"? To associate the fd returned in sys_exit with the pathname in sys_enter.1447 * args_size: sum of the sizes of the syscall arguments, anything after that is augmented stuff: pathname for openat, etc.1448 * nonexistent: Just a hole in the syscall table, syscall id not allocated1449 */1450struct syscall {1451 struct tep_event *tp_format;1452 int nr_args;1453 int args_size;1454 struct {1455 struct bpf_program *sys_enter,1456 *sys_exit;1457 } bpf_prog;1458 bool is_exit;1459 bool is_open;1460 bool nonexistent;1461 bool use_btf;1462 struct tep_format_field *args;1463 const char *name;1464 const struct syscall_fmt *fmt;1465 struct syscall_arg_fmt *arg_fmt;1466};1467 1468/*1469 * We need to have this 'calculated' boolean because in some cases we really1470 * don't know what is the duration of a syscall, for instance, when we start1471 * a session and some threads are waiting for a syscall to finish, say 'poll',1472 * in which case all we can do is to print "( ? ) for duration and for the1473 * start timestamp.1474 */1475static size_t fprintf_duration(unsigned long t, bool calculated, FILE *fp)1476{1477 double duration = (double)t / NSEC_PER_MSEC;1478 size_t printed = fprintf(fp, "(");1479 1480 if (!calculated)1481 printed += fprintf(fp, " ");1482 else if (duration >= 1.0)1483 printed += color_fprintf(fp, PERF_COLOR_RED, "%6.3f ms", duration);1484 else if (duration >= 0.01)1485 printed += color_fprintf(fp, PERF_COLOR_YELLOW, "%6.3f ms", duration);1486 else1487 printed += color_fprintf(fp, PERF_COLOR_NORMAL, "%6.3f ms", duration);1488 return printed + fprintf(fp, "): ");1489}1490 1491/**1492 * filename.ptr: The filename char pointer that will be vfs_getname'd1493 * filename.entry_str_pos: Where to insert the string translated from1494 * filename.ptr by the vfs_getname tracepoint/kprobe.1495 * ret_scnprintf: syscall args may set this to a different syscall return1496 * formatter, for instance, fcntl may return fds, file flags, etc.1497 */1498struct thread_trace {1499 u64 entry_time;1500 bool entry_pending;1501 unsigned long nr_events;1502 unsigned long pfmaj, pfmin;1503 char *entry_str;1504 double runtime_ms;1505 size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg);1506 struct {1507 unsigned long ptr;1508 short int entry_str_pos;1509 bool pending_open;1510 unsigned int namelen;1511 char *name;1512 } filename;1513 struct {1514 int max;1515 struct file *table;1516 } files;1517 1518 struct intlist *syscall_stats;1519};1520 1521static struct thread_trace *thread_trace__new(void)1522{1523 struct thread_trace *ttrace = zalloc(sizeof(struct thread_trace));1524 1525 if (ttrace) {1526 ttrace->files.max = -1;1527 ttrace->syscall_stats = intlist__new(NULL);1528 }1529 1530 return ttrace;1531}1532 1533static void thread_trace__free_files(struct thread_trace *ttrace);1534 1535static void thread_trace__delete(void *pttrace)1536{1537 struct thread_trace *ttrace = pttrace;1538 1539 if (!ttrace)1540 return;1541 1542 intlist__delete(ttrace->syscall_stats);1543 ttrace->syscall_stats = NULL;1544 thread_trace__free_files(ttrace);1545 zfree(&ttrace->entry_str);1546 free(ttrace);1547}1548 1549static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)1550{1551 struct thread_trace *ttrace;1552 1553 if (thread == NULL)1554 goto fail;1555 1556 if (thread__priv(thread) == NULL)1557 thread__set_priv(thread, thread_trace__new());1558 1559 if (thread__priv(thread) == NULL)1560 goto fail;1561 1562 ttrace = thread__priv(thread);1563 ++ttrace->nr_events;1564 1565 return ttrace;1566fail:1567 color_fprintf(fp, PERF_COLOR_RED,1568 "WARNING: not enough memory, dropping samples!\n");1569 return NULL;1570}1571 1572 1573void syscall_arg__set_ret_scnprintf(struct syscall_arg *arg,1574 size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg))1575{1576 struct thread_trace *ttrace = thread__priv(arg->thread);1577 1578 ttrace->ret_scnprintf = ret_scnprintf;1579}1580 1581#define TRACE_PFMAJ (1 << 0)1582#define TRACE_PFMIN (1 << 1)1583 1584static const size_t trace__entry_str_size = 2048;1585 1586static void thread_trace__free_files(struct thread_trace *ttrace)1587{1588 for (int i = 0; i < ttrace->files.max; ++i) {1589 struct file *file = ttrace->files.table + i;1590 zfree(&file->pathname);1591 }1592 1593 zfree(&ttrace->files.table);1594 ttrace->files.max = -1;1595}1596 1597static struct file *thread_trace__files_entry(struct thread_trace *ttrace, int fd)1598{1599 if (fd < 0)1600 return NULL;1601 1602 if (fd > ttrace->files.max) {1603 struct file *nfiles = realloc(ttrace->files.table, (fd + 1) * sizeof(struct file));1604 1605 if (nfiles == NULL)1606 return NULL;1607 1608 if (ttrace->files.max != -1) {1609 memset(nfiles + ttrace->files.max + 1, 0,1610 (fd - ttrace->files.max) * sizeof(struct file));1611 } else {1612 memset(nfiles, 0, (fd + 1) * sizeof(struct file));1613 }1614 1615 ttrace->files.table = nfiles;1616 ttrace->files.max = fd;1617 }1618 1619 return ttrace->files.table + fd;1620}1621 1622struct file *thread__files_entry(struct thread *thread, int fd)1623{1624 return thread_trace__files_entry(thread__priv(thread), fd);1625}1626 1627static int trace__set_fd_pathname(struct thread *thread, int fd, const char *pathname)1628{1629 struct thread_trace *ttrace = thread__priv(thread);1630 struct file *file = thread_trace__files_entry(ttrace, fd);1631 1632 if (file != NULL) {1633 struct stat st;1634 if (stat(pathname, &st) == 0)1635 file->dev_maj = major(st.st_rdev);1636 file->pathname = strdup(pathname);1637 if (file->pathname)1638 return 0;1639 }1640 1641 return -1;1642}1643 1644static int thread__read_fd_path(struct thread *thread, int fd)1645{1646 char linkname[PATH_MAX], pathname[PATH_MAX];1647 struct stat st;1648 int ret;1649 1650 if (thread__pid(thread) == thread__tid(thread)) {1651 scnprintf(linkname, sizeof(linkname),1652 "/proc/%d/fd/%d", thread__pid(thread), fd);1653 } else {1654 scnprintf(linkname, sizeof(linkname),1655 "/proc/%d/task/%d/fd/%d",1656 thread__pid(thread), thread__tid(thread), fd);1657 }1658 1659 if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))1660 return -1;1661 1662 ret = readlink(linkname, pathname, sizeof(pathname));1663 1664 if (ret < 0 || ret > st.st_size)1665 return -1;1666 1667 pathname[ret] = '\0';1668 return trace__set_fd_pathname(thread, fd, pathname);1669}1670 1671static const char *thread__fd_path(struct thread *thread, int fd,1672 struct trace *trace)1673{1674 struct thread_trace *ttrace = thread__priv(thread);1675 1676 if (ttrace == NULL || trace->fd_path_disabled)1677 return NULL;1678 1679 if (fd < 0)1680 return NULL;1681 1682 if ((fd > ttrace->files.max || ttrace->files.table[fd].pathname == NULL)) {1683 if (!trace->live)1684 return NULL;1685 ++trace->stats.proc_getname;1686 if (thread__read_fd_path(thread, fd))1687 return NULL;1688 }1689 1690 return ttrace->files.table[fd].pathname;1691}1692 1693size_t syscall_arg__scnprintf_fd(char *bf, size_t size, struct syscall_arg *arg)1694{1695 int fd = arg->val;1696 size_t printed = scnprintf(bf, size, "%d", fd);1697 const char *path = thread__fd_path(arg->thread, fd, arg->trace);1698 1699 if (path)1700 printed += scnprintf(bf + printed, size - printed, "<%s>", path);1701 1702 return printed;1703}1704 1705size_t pid__scnprintf_fd(struct trace *trace, pid_t pid, int fd, char *bf, size_t size)1706{1707 size_t printed = scnprintf(bf, size, "%d", fd);1708 struct thread *thread = machine__find_thread(trace->host, pid, pid);1709 1710 if (thread) {1711 const char *path = thread__fd_path(thread, fd, trace);1712 1713 if (path)1714 printed += scnprintf(bf + printed, size - printed, "<%s>", path);1715 1716 thread__put(thread);1717 }1718 1719 return printed;1720}1721 1722static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,1723 struct syscall_arg *arg)1724{1725 int fd = arg->val;1726 size_t printed = syscall_arg__scnprintf_fd(bf, size, arg);1727 struct thread_trace *ttrace = thread__priv(arg->thread);1728 1729 if (ttrace && fd >= 0 && fd <= ttrace->files.max)1730 zfree(&ttrace->files.table[fd].pathname);1731 1732 return printed;1733}1734 1735static void thread__set_filename_pos(struct thread *thread, const char *bf,1736 unsigned long ptr)1737{1738 struct thread_trace *ttrace = thread__priv(thread);1739 1740 ttrace->filename.ptr = ptr;1741 ttrace->filename.entry_str_pos = bf - ttrace->entry_str;1742}1743 1744static size_t syscall_arg__scnprintf_augmented_string(struct syscall_arg *arg, char *bf, size_t size)1745{1746 struct augmented_arg *augmented_arg = arg->augmented.args;1747 size_t printed = scnprintf(bf, size, "\"%.*s\"", augmented_arg->size, augmented_arg->value);1748 /*1749 * So that the next arg with a payload can consume its augmented arg, i.e. for rename* syscalls1750 * we would have two strings, each prefixed by its size.1751 */1752 int consumed = sizeof(*augmented_arg) + augmented_arg->size;1753 1754 arg->augmented.args = ((void *)arg->augmented.args) + consumed;1755 arg->augmented.size -= consumed;1756 1757 return printed;1758}1759 1760static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,1761 struct syscall_arg *arg)1762{1763 unsigned long ptr = arg->val;1764 1765 if (arg->augmented.args)1766 return syscall_arg__scnprintf_augmented_string(arg, bf, size);1767 1768 if (!arg->trace->vfs_getname)1769 return scnprintf(bf, size, "%#x", ptr);1770 1771 thread__set_filename_pos(arg->thread, bf, ptr);1772 return 0;1773}1774 1775#define MAX_CONTROL_CHAR 311776#define MAX_ASCII 1271777 1778static size_t syscall_arg__scnprintf_buf(char *bf, size_t size, struct syscall_arg *arg)1779{1780 struct augmented_arg *augmented_arg = arg->augmented.args;1781 unsigned char *orig = (unsigned char *)augmented_arg->value;1782 size_t printed = 0;1783 int consumed;1784 1785 if (augmented_arg == NULL)1786 return 0;1787 1788 for (int j = 0; j < augmented_arg->size; ++j) {1789 bool control_char = orig[j] <= MAX_CONTROL_CHAR || orig[j] >= MAX_ASCII;1790 /* print control characters (0~31 and 127), and non-ascii characters in \(digits) */1791 printed += scnprintf(bf + printed, size - printed, control_char ? "\\%d" : "%c", (int)orig[j]);1792 }1793 1794 consumed = sizeof(*augmented_arg) + augmented_arg->size;1795 arg->augmented.args = ((void *)arg->augmented.args) + consumed;1796 arg->augmented.size -= consumed;1797 1798 return printed;1799}1800 1801static bool trace__filter_duration(struct trace *trace, double t)1802{1803 return t < (trace->duration_filter * NSEC_PER_MSEC);1804}1805 1806static size_t __trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)1807{1808 double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;1809 1810 return fprintf(fp, "%10.3f ", ts);1811}1812 1813/*1814 * We're handling tstamp=0 as an undefined tstamp, i.e. like when we are1815 * using ttrace->entry_time for a thread that receives a sys_exit without1816 * first having received a sys_enter ("poll" issued before tracing session1817 * starts, lost sys_enter exit due to ring buffer overflow).1818 */1819static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)1820{1821 if (tstamp > 0)1822 return __trace__fprintf_tstamp(trace, tstamp, fp);1823 1824 return fprintf(fp, " ? ");1825}1826 1827static pid_t workload_pid = -1;1828static volatile sig_atomic_t done = false;1829static volatile sig_atomic_t interrupted = false;1830 1831static void sighandler_interrupt(int sig __maybe_unused)1832{1833 done = interrupted = true;1834}1835 1836static void sighandler_chld(int sig __maybe_unused, siginfo_t *info,1837 void *context __maybe_unused)1838{1839 if (info->si_pid == workload_pid)1840 done = true;1841}1842 1843static size_t trace__fprintf_comm_tid(struct trace *trace, struct thread *thread, FILE *fp)1844{1845 size_t printed = 0;1846 1847 if (trace->multiple_threads) {1848 if (trace->show_comm)1849 printed += fprintf(fp, "%.14s/", thread__comm_str(thread));1850 printed += fprintf(fp, "%d ", thread__tid(thread));1851 }1852 1853 return printed;1854}1855 1856static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,1857 u64 duration, bool duration_calculated, u64 tstamp, FILE *fp)1858{1859 size_t printed = 0;1860 1861 if (trace->show_tstamp)1862 printed = trace__fprintf_tstamp(trace, tstamp, fp);1863 if (trace->show_duration)1864 printed += fprintf_duration(duration, duration_calculated, fp);1865 return printed + trace__fprintf_comm_tid(trace, thread, fp);1866}1867 1868static int trace__process_event(struct trace *trace, struct machine *machine,1869 union perf_event *event, struct perf_sample *sample)1870{1871 int ret = 0;1872 1873 switch (event->header.type) {1874 case PERF_RECORD_LOST:1875 color_fprintf(trace->output, PERF_COLOR_RED,1876 "LOST %" PRIu64 " events!\n", event->lost.lost);1877 ret = machine__process_lost_event(machine, event, sample);1878 break;1879 default:1880 ret = machine__process_event(machine, event, sample);1881 break;1882 }1883 1884 return ret;1885}1886 1887static int trace__tool_process(const struct perf_tool *tool,1888 union perf_event *event,1889 struct perf_sample *sample,1890 struct machine *machine)1891{1892 struct trace *trace = container_of(tool, struct trace, tool);1893 return trace__process_event(trace, machine, event, sample);1894}1895 1896static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)1897{1898 struct machine *machine = vmachine;1899 1900 if (machine->kptr_restrict_warned)1901 return NULL;1902 1903 if (symbol_conf.kptr_restrict) {1904 pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"1905 "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"1906 "Kernel samples will not be resolved.\n");1907 machine->kptr_restrict_warned = true;1908 return NULL;1909 }1910 1911 return machine__resolve_kernel_addr(vmachine, addrp, modp);1912}1913 1914static int trace__symbols_init(struct trace *trace, struct evlist *evlist)1915{1916 int err = symbol__init(NULL);1917 1918 if (err)1919 return err;1920 1921 trace->host = machine__new_host();1922 if (trace->host == NULL)1923 return -ENOMEM;1924 1925 thread__set_priv_destructor(thread_trace__delete);1926 1927 err = trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr);1928 if (err < 0)1929 goto out;1930 1931 err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,1932 evlist->core.threads, trace__tool_process,1933 true, false, 1);1934out:1935 if (err)1936 symbol__exit();1937 1938 return err;1939}1940 1941static void trace__symbols__exit(struct trace *trace)1942{1943 machine__exit(trace->host);1944 trace->host = NULL;1945 1946 symbol__exit();1947}1948 1949static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)1950{1951 int idx;1952 1953 if (nr_args == RAW_SYSCALL_ARGS_NUM && sc->fmt && sc->fmt->nr_args != 0)1954 nr_args = sc->fmt->nr_args;1955 1956 sc->arg_fmt = calloc(nr_args, sizeof(*sc->arg_fmt));1957 if (sc->arg_fmt == NULL)1958 return -1;1959 1960 for (idx = 0; idx < nr_args; ++idx) {1961 if (sc->fmt)1962 sc->arg_fmt[idx] = sc->fmt->arg[idx];1963 }1964 1965 sc->nr_args = nr_args;1966 return 0;1967}1968 1969static const struct syscall_arg_fmt syscall_arg_fmts__by_name[] = {1970 { .name = "msr", .scnprintf = SCA_X86_MSR, .strtoul = STUL_X86_MSR, },1971 { .name = "vector", .scnprintf = SCA_X86_IRQ_VECTORS, .strtoul = STUL_X86_IRQ_VECTORS, },1972};1973 1974static int syscall_arg_fmt__cmp(const void *name, const void *fmtp)1975{1976 const struct syscall_arg_fmt *fmt = fmtp;1977 return strcmp(name, fmt->name);1978}1979 1980static const struct syscall_arg_fmt *1981__syscall_arg_fmt__find_by_name(const struct syscall_arg_fmt *fmts, const int nmemb,1982 const char *name)1983{1984 return bsearch(name, fmts, nmemb, sizeof(struct syscall_arg_fmt), syscall_arg_fmt__cmp);1985}1986 1987static const struct syscall_arg_fmt *syscall_arg_fmt__find_by_name(const char *name)1988{1989 const int nmemb = ARRAY_SIZE(syscall_arg_fmts__by_name);1990 return __syscall_arg_fmt__find_by_name(syscall_arg_fmts__by_name, nmemb, name);1991}1992 1993static struct tep_format_field *1994syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field *field,1995 bool *use_btf)1996{1997 struct tep_format_field *last_field = NULL;1998 int len;1999 2000 for (; field; field = field->next, ++arg) {2001 last_field = field;2002 2003 if (arg->scnprintf)2004 continue;2005 2006 len = strlen(field->name);2007 2008 // As far as heuristics (or intention) goes this seems to hold true, and makes sense!2009 if ((field->flags & TEP_FIELD_IS_POINTER) && strstarts(field->type, "const "))2010 arg->from_user = true;2011 2012 if (strcmp(field->type, "const char *") == 0 &&2013 ((len >= 4 && strcmp(field->name + len - 4, "name") == 0) ||2014 strstr(field->name, "path") != NULL)) {2015 arg->scnprintf = SCA_FILENAME;2016 } else if ((field->flags & TEP_FIELD_IS_POINTER) || strstr(field->name, "addr"))2017 arg->scnprintf = SCA_PTR;2018 else if (strcmp(field->type, "pid_t") == 0)2019 arg->scnprintf = SCA_PID;2020 else if (strcmp(field->type, "umode_t") == 0)2021 arg->scnprintf = SCA_MODE_T;2022 else if ((field->flags & TEP_FIELD_IS_ARRAY) && strstr(field->type, "char")) {2023 arg->scnprintf = SCA_CHAR_ARRAY;2024 arg->nr_entries = field->arraylen;2025 } else if ((strcmp(field->type, "int") == 0 ||2026 strcmp(field->type, "unsigned int") == 0 ||2027 strcmp(field->type, "long") == 0) &&2028 len >= 2 && strcmp(field->name + len - 2, "fd") == 0) {2029 /*2030 * /sys/kernel/tracing/events/syscalls/sys_enter*2031 * grep -E 'field:.*fd;' .../format|sed -r 's/.*field:([a-z ]+) [a-z_]*fd.+/\1/g'|sort|uniq -c2032 * 65 int2033 * 23 unsigned int2034 * 7 unsigned long2035 */2036 arg->scnprintf = SCA_FD;2037 } else if (strstr(field->type, "enum") && use_btf != NULL) {2038 *use_btf = true;2039 arg->strtoul = STUL_BTF_TYPE;2040 } else {2041 const struct syscall_arg_fmt *fmt =2042 syscall_arg_fmt__find_by_name(field->name);2043 2044 if (fmt) {2045 arg->scnprintf = fmt->scnprintf;2046 arg->strtoul = fmt->strtoul;2047 }2048 }2049 }2050 2051 return last_field;2052}2053 2054static int syscall__set_arg_fmts(struct syscall *sc)2055{2056 struct tep_format_field *last_field = syscall_arg_fmt__init_array(sc->arg_fmt, sc->args,2057 &sc->use_btf);2058 2059 if (last_field)2060 sc->args_size = last_field->offset + last_field->size;2061 2062 return 0;2063}2064 2065static int trace__read_syscall_info(struct trace *trace, int id)2066{2067 char tp_name[128];2068 struct syscall *sc;2069 const char *name = syscalltbl__name(trace->sctbl, id);2070 int err;2071 2072#ifdef HAVE_SYSCALL_TABLE_SUPPORT2073 if (trace->syscalls.table == NULL) {2074 trace->syscalls.table = calloc(trace->sctbl->syscalls.max_id + 1, sizeof(*sc));2075 if (trace->syscalls.table == NULL)2076 return -ENOMEM;2077 }2078#else2079 if (id > trace->sctbl->syscalls.max_id || (id == 0 && trace->syscalls.table == NULL)) {2080 // When using libaudit we don't know beforehand what is the max syscall id2081 struct syscall *table = realloc(trace->syscalls.table, (id + 1) * sizeof(*sc));2082 2083 if (table == NULL)2084 return -ENOMEM;2085 2086 // Need to memset from offset 0 and +1 members if brand new2087 if (trace->syscalls.table == NULL)2088 memset(table, 0, (id + 1) * sizeof(*sc));2089 else2090 memset(table + trace->sctbl->syscalls.max_id + 1, 0, (id - trace->sctbl->syscalls.max_id) * sizeof(*sc));2091 2092 trace->syscalls.table = table;2093 trace->sctbl->syscalls.max_id = id;2094 }2095#endif2096 sc = trace->syscalls.table + id;2097 if (sc->nonexistent)2098 return -EEXIST;2099 2100 if (name == NULL) {2101 sc->nonexistent = true;2102 return -EEXIST;2103 }2104 2105 sc->name = name;2106 sc->fmt = syscall_fmt__find(sc->name);2107 2108 snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);2109 sc->tp_format = trace_event__tp_format("syscalls", tp_name);2110 2111 if (IS_ERR(sc->tp_format) && sc->fmt && sc->fmt->alias) {2112 snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);2113 sc->tp_format = trace_event__tp_format("syscalls", tp_name);2114 }2115 2116 /*2117 * Fails to read trace point format via sysfs node, so the trace point2118 * doesn't exist. Set the 'nonexistent' flag as true.2119 */2120 if (IS_ERR(sc->tp_format)) {2121 sc->nonexistent = true;2122 return PTR_ERR(sc->tp_format);2123 }2124 2125 if (syscall__alloc_arg_fmts(sc, IS_ERR(sc->tp_format) ?2126 RAW_SYSCALL_ARGS_NUM : sc->tp_format->format.nr_fields))2127 return -ENOMEM;2128 2129 sc->args = sc->tp_format->format.fields;2130 /*2131 * We need to check and discard the first variable '__syscall_nr'2132 * or 'nr' that mean the syscall number. It is needless here.2133 * So drop '__syscall_nr' or 'nr' field but does not exist on older kernels.2134 */2135 if (sc->args && (!strcmp(sc->args->name, "__syscall_nr") || !strcmp(sc->args->name, "nr"))) {2136 sc->args = sc->args->next;2137 --sc->nr_args;2138 }2139 2140 sc->is_exit = !strcmp(name, "exit_group") || !strcmp(name, "exit");2141 sc->is_open = !strcmp(name, "open") || !strcmp(name, "openat");2142 2143 err = syscall__set_arg_fmts(sc);2144 2145 /* after calling syscall__set_arg_fmts() we'll know whether use_btf is true */2146 if (sc->use_btf)2147 trace__load_vmlinux_btf(trace);2148 2149 return err;2150}2151 2152static int evsel__init_tp_arg_scnprintf(struct evsel *evsel, bool *use_btf)2153{2154 struct syscall_arg_fmt *fmt = evsel__syscall_arg_fmt(evsel);2155 2156 if (fmt != NULL) {2157 syscall_arg_fmt__init_array(fmt, evsel->tp_format->format.fields, use_btf);2158 return 0;2159 }2160 2161 return -ENOMEM;2162}2163 2164static int intcmp(const void *a, const void *b)2165{2166 const int *one = a, *another = b;2167 2168 return *one - *another;2169}2170 2171static int trace__validate_ev_qualifier(struct trace *trace)2172{2173 int err = 0;2174 bool printed_invalid_prefix = false;2175 struct str_node *pos;2176 size_t nr_used = 0, nr_allocated = strlist__nr_entries(trace->ev_qualifier);2177 2178 trace->ev_qualifier_ids.entries = malloc(nr_allocated *2179 sizeof(trace->ev_qualifier_ids.entries[0]));2180 2181 if (trace->ev_qualifier_ids.entries == NULL) {2182 fputs("Error:\tNot enough memory for allocating events qualifier ids\n",2183 trace->output);2184 err = -EINVAL;2185 goto out;2186 }2187 2188 strlist__for_each_entry(pos, trace->ev_qualifier) {2189 const char *sc = pos->s;2190 int id = syscalltbl__id(trace->sctbl, sc), match_next = -1;2191 2192 if (id < 0) {2193 id = syscalltbl__strglobmatch_first(trace->sctbl, sc, &match_next);2194 if (id >= 0)2195 goto matches;2196 2197 if (!printed_invalid_prefix) {2198 pr_debug("Skipping unknown syscalls: ");2199 printed_invalid_prefix = true;2200 } else {2201 pr_debug(", ");2202 }2203 2204 pr_debug("%s", sc);2205 continue;2206 }2207matches:2208 trace->ev_qualifier_ids.entries[nr_used++] = id;2209 if (match_next == -1)2210 continue;2211 2212 while (1) {2213 id = syscalltbl__strglobmatch_next(trace->sctbl, sc, &match_next);2214 if (id < 0)2215 break;2216 if (nr_allocated == nr_used) {2217 void *entries;2218 2219 nr_allocated += 8;2220 entries = realloc(trace->ev_qualifier_ids.entries,2221 nr_allocated * sizeof(trace->ev_qualifier_ids.entries[0]));2222 if (entries == NULL) {2223 err = -ENOMEM;2224 fputs("\nError:\t Not enough memory for parsing\n", trace->output);2225 goto out_free;2226 }2227 trace->ev_qualifier_ids.entries = entries;2228 }2229 trace->ev_qualifier_ids.entries[nr_used++] = id;2230 }2231 }2232 2233 trace->ev_qualifier_ids.nr = nr_used;2234 qsort(trace->ev_qualifier_ids.entries, nr_used, sizeof(int), intcmp);2235out:2236 if (printed_invalid_prefix)2237 pr_debug("\n");2238 return err;2239out_free:2240 zfree(&trace->ev_qualifier_ids.entries);2241 trace->ev_qualifier_ids.nr = 0;2242 goto out;2243}2244 2245static __maybe_unused bool trace__syscall_enabled(struct trace *trace, int id)2246{2247 bool in_ev_qualifier;2248 2249 if (trace->ev_qualifier_ids.nr == 0)2250 return true;2251 2252 in_ev_qualifier = bsearch(&id, trace->ev_qualifier_ids.entries,2253 trace->ev_qualifier_ids.nr, sizeof(int), intcmp) != NULL;2254 2255 if (in_ev_qualifier)2256 return !trace->not_ev_qualifier;2257 2258 return trace->not_ev_qualifier;2259}2260 2261/*2262 * args is to be interpreted as a series of longs but we need to handle2263 * 8-byte unaligned accesses. args points to raw_data within the event2264 * and raw_data is guaranteed to be 8-byte unaligned because it is2265 * preceded by raw_size which is a u32. So we need to copy args to a temp2266 * variable to read it. Most notably this avoids extended load instructions2267 * on unaligned addresses2268 */2269unsigned long syscall_arg__val(struct syscall_arg *arg, u8 idx)2270{2271 unsigned long val;2272 unsigned char *p = arg->args + sizeof(unsigned long) * idx;2273 2274 memcpy(&val, p, sizeof(val));2275 return val;2276}2277 2278static size_t syscall__scnprintf_name(struct syscall *sc, char *bf, size_t size,2279 struct syscall_arg *arg)2280{2281 if (sc->arg_fmt && sc->arg_fmt[arg->idx].name)2282 return scnprintf(bf, size, "%s: ", sc->arg_fmt[arg->idx].name);2283 2284 return scnprintf(bf, size, "arg%d: ", arg->idx);2285}2286 2287/*2288 * Check if the value is in fact zero, i.e. mask whatever needs masking, such2289 * as mount 'flags' argument that needs ignoring some magic flag, see comment2290 * in tools/perf/trace/beauty/mount_flags.c2291 */2292static unsigned long syscall_arg_fmt__mask_val(struct syscall_arg_fmt *fmt, struct syscall_arg *arg, unsigned long val)2293{2294 if (fmt && fmt->mask_val)2295 return fmt->mask_val(arg, val);2296 2297 return val;2298}2299 2300static size_t syscall_arg_fmt__scnprintf_val(struct syscall_arg_fmt *fmt, char *bf, size_t size,2301 struct syscall_arg *arg, unsigned long val)2302{2303 if (fmt && fmt->scnprintf) {2304 arg->val = val;2305 if (fmt->parm)2306 arg->parm = fmt->parm;2307 return fmt->scnprintf(bf, size, arg);2308 }2309 return scnprintf(bf, size, "%ld", val);2310}2311 2312static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,2313 unsigned char *args, void *augmented_args, int augmented_args_size,2314 struct trace *trace, struct thread *thread)2315{2316 size_t printed = 0, btf_printed;2317 unsigned long val;2318 u8 bit = 1;2319 struct syscall_arg arg = {2320 .args = args,2321 .augmented = {2322 .size = augmented_args_size,2323 .args = augmented_args,2324 },2325 .idx = 0,2326 .mask = 0,2327 .trace = trace,2328 .thread = thread,2329 .show_string_prefix = trace->show_string_prefix,2330 };2331 struct thread_trace *ttrace = thread__priv(thread);2332 void *default_scnprintf;2333 2334 /*2335 * Things like fcntl will set this in its 'cmd' formatter to pick the2336 * right formatter for the return value (an fd? file flags?), which is2337 * not needed for syscalls that always return a given type, say an fd.2338 */2339 ttrace->ret_scnprintf = NULL;2340 2341 if (sc->args != NULL) {2342 struct tep_format_field *field;2343 2344 for (field = sc->args; field;2345 field = field->next, ++arg.idx, bit <<= 1) {2346 if (arg.mask & bit)2347 continue;2348 2349 arg.fmt = &sc->arg_fmt[arg.idx];2350 val = syscall_arg__val(&arg, arg.idx);2351 /*2352 * Some syscall args need some mask, most don't and2353 * return val untouched.2354 */2355 val = syscall_arg_fmt__mask_val(&sc->arg_fmt[arg.idx], &arg, val);2356 2357 /*2358 * Suppress this argument if its value is zero and show_zero2359 * property isn't set.2360 *2361 * If it has a BTF type, then override the zero suppression knob2362 * as the common case is for zero in an enum to have an associated entry.2363 */2364 if (val == 0 && !trace->show_zeros &&2365 !(sc->arg_fmt && sc->arg_fmt[arg.idx].show_zero) &&2366 !(sc->arg_fmt && sc->arg_fmt[arg.idx].strtoul == STUL_BTF_TYPE))2367 continue;2368 2369 printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");2370 2371 if (trace->show_arg_names)2372 printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);2373 2374 default_scnprintf = sc->arg_fmt[arg.idx].scnprintf;2375 2376 if (trace->force_btf || default_scnprintf == NULL || default_scnprintf == SCA_PTR) {2377 btf_printed = trace__btf_scnprintf(trace, &arg, bf + printed,2378 size - printed, val, field->type);2379 if (btf_printed) {2380 printed += btf_printed;2381 continue;2382 }2383 }2384 2385 printed += syscall_arg_fmt__scnprintf_val(&sc->arg_fmt[arg.idx],2386 bf + printed, size - printed, &arg, val);2387 }2388 } else if (IS_ERR(sc->tp_format)) {2389 /*2390 * If we managed to read the tracepoint /format file, then we2391 * may end up not having any args, like with gettid(), so only2392 * print the raw args when we didn't manage to read it.2393 */2394 while (arg.idx < sc->nr_args) {2395 if (arg.mask & bit)2396 goto next_arg;2397 val = syscall_arg__val(&arg, arg.idx);2398 if (printed)2399 printed += scnprintf(bf + printed, size - printed, ", ");2400 printed += syscall__scnprintf_name(sc, bf + printed, size - printed, &arg);2401 printed += syscall_arg_fmt__scnprintf_val(&sc->arg_fmt[arg.idx], bf + printed, size - printed, &arg, val);2402next_arg:2403 ++arg.idx;2404 bit <<= 1;2405 }2406 }2407 2408 return printed;2409}2410 2411typedef int (*tracepoint_handler)(struct trace *trace, struct evsel *evsel,2412 union perf_event *event,2413 struct perf_sample *sample);2414 2415static struct syscall *trace__syscall_info(struct trace *trace,2416 struct evsel *evsel, int id)2417{2418 int err = 0;2419 2420 if (id < 0) {2421 2422 /*2423 * XXX: Noticed on x86_64, reproduced as far back as 3.0.36, haven't tried2424 * before that, leaving at a higher verbosity level till that is2425 * explained. Reproduced with plain ftrace with:2426 *2427 * echo 1 > /t/events/raw_syscalls/sys_exit/enable2428 * grep "NR -1 " /t/trace_pipe2429 *2430 * After generating some load on the machine.2431 */2432 if (verbose > 1) {2433 static u64 n;2434 fprintf(trace->output, "Invalid syscall %d id, skipping (%s, %" PRIu64 ") ...\n",2435 id, evsel__name(evsel), ++n);2436 }2437 return NULL;2438 }2439 2440 err = -EINVAL;2441 2442#ifdef HAVE_SYSCALL_TABLE_SUPPORT2443 if (id > trace->sctbl->syscalls.max_id) {2444#else2445 if (id >= trace->sctbl->syscalls.max_id) {2446 /*2447 * With libaudit we don't know beforehand what is the max_id,2448 * so we let trace__read_syscall_info() figure that out as we2449 * go on reading syscalls.2450 */2451 err = trace__read_syscall_info(trace, id);2452 if (err)2453#endif2454 goto out_cant_read;2455 }2456 2457 if ((trace->syscalls.table == NULL || trace->syscalls.table[id].name == NULL) &&2458 (err = trace__read_syscall_info(trace, id)) != 0)2459 goto out_cant_read;2460 2461 if (trace->syscalls.table && trace->syscalls.table[id].nonexistent)2462 goto out_cant_read;2463 2464 return &trace->syscalls.table[id];2465 2466out_cant_read:2467 if (verbose > 0) {2468 char sbuf[STRERR_BUFSIZE];2469 fprintf(trace->output, "Problems reading syscall %d: %d (%s)", id, -err, str_error_r(-err, sbuf, sizeof(sbuf)));2470 if (id <= trace->sctbl->syscalls.max_id && trace->syscalls.table[id].name != NULL)2471 fprintf(trace->output, "(%s)", trace->syscalls.table[id].name);2472 fputs(" information\n", trace->output);2473 }2474 return NULL;2475}2476 2477struct syscall_stats {2478 struct stats stats;2479 u64 nr_failures;2480 int max_errno;2481 u32 *errnos;2482};2483 2484static void thread__update_stats(struct thread *thread, struct thread_trace *ttrace,2485 int id, struct perf_sample *sample, long err, bool errno_summary)2486{2487 struct int_node *inode;2488 struct syscall_stats *stats;2489 u64 duration = 0;2490 2491 inode = intlist__findnew(ttrace->syscall_stats, id);2492 if (inode == NULL)2493 return;2494 2495 stats = inode->priv;2496 if (stats == NULL) {2497 stats = zalloc(sizeof(*stats));2498 if (stats == NULL)2499 return;2500 2501 init_stats(&stats->stats);2502 inode->priv = stats;2503 }2504 2505 if (ttrace->entry_time && sample->time > ttrace->entry_time)2506 duration = sample->time - ttrace->entry_time;2507 2508 update_stats(&stats->stats, duration);2509 2510 if (err < 0) {2511 ++stats->nr_failures;2512 2513 if (!errno_summary)2514 return;2515 2516 err = -err;2517 if (err > stats->max_errno) {2518 u32 *new_errnos = realloc(stats->errnos, err * sizeof(u32));2519 2520 if (new_errnos) {2521 memset(new_errnos + stats->max_errno, 0, (err - stats->max_errno) * sizeof(u32));2522 } else {2523 pr_debug("Not enough memory for errno stats for thread \"%s\"(%d/%d), results will be incomplete\n",2524 thread__comm_str(thread), thread__pid(thread),2525 thread__tid(thread));2526 return;2527 }2528 2529 stats->errnos = new_errnos;2530 stats->max_errno = err;2531 }2532 2533 ++stats->errnos[err - 1];2534 }2535}2536 2537static int trace__printf_interrupted_entry(struct trace *trace)2538{2539 struct thread_trace *ttrace;2540 size_t printed;2541 int len;2542 2543 if (trace->failure_only || trace->current == NULL)2544 return 0;2545 2546 ttrace = thread__priv(trace->current);2547 2548 if (!ttrace->entry_pending)2549 return 0;2550 2551 printed = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output);2552 printed += len = fprintf(trace->output, "%s)", ttrace->entry_str);2553 2554 if (len < trace->args_alignment - 4)2555 printed += fprintf(trace->output, "%-*s", trace->args_alignment - 4 - len, " ");2556 2557 printed += fprintf(trace->output, " ...\n");2558 2559 ttrace->entry_pending = false;2560 ++trace->nr_events_printed;2561 2562 return printed;2563}2564 2565static int trace__fprintf_sample(struct trace *trace, struct evsel *evsel,2566 struct perf_sample *sample, struct thread *thread)2567{2568 int printed = 0;2569 2570 if (trace->print_sample) {2571 double ts = (double)sample->time / NSEC_PER_MSEC;2572 2573 printed += fprintf(trace->output, "%22s %10.3f %s %d/%d [%d]\n",2574 evsel__name(evsel), ts,2575 thread__comm_str(thread),2576 sample->pid, sample->tid, sample->cpu);2577 }2578 2579 return printed;2580}2581 2582static void *syscall__augmented_args(struct syscall *sc, struct perf_sample *sample, int *augmented_args_size, int raw_augmented_args_size)2583{2584 void *augmented_args = NULL;2585 /*2586 * For now with BPF raw_augmented we hook into raw_syscalls:sys_enter2587 * and there we get all 6 syscall args plus the tracepoint common fields2588 * that gets calculated at the start and the syscall_nr (another long).2589 * So we check if that is the case and if so don't look after the2590 * sc->args_size but always after the full raw_syscalls:sys_enter payload,2591 * which is fixed.2592 *2593 * We'll revisit this later to pass s->args_size to the BPF augmenter2594 * (now tools/perf/examples/bpf/augmented_raw_syscalls.c, so that it2595 * copies only what we need for each syscall, like what happens when we2596 * use syscalls:sys_enter_NAME, so that we reduce the kernel/userspace2597 * traffic to just what is needed for each syscall.2598 */2599 int args_size = raw_augmented_args_size ?: sc->args_size;2600 2601 *augmented_args_size = sample->raw_size - args_size;2602 if (*augmented_args_size > 0)2603 augmented_args = sample->raw_data + args_size;2604 2605 return augmented_args;2606}2607 2608static void syscall__exit(struct syscall *sc)2609{2610 if (!sc)2611 return;2612 2613 zfree(&sc->arg_fmt);2614}2615 2616static int trace__sys_enter(struct trace *trace, struct evsel *evsel,2617 union perf_event *event __maybe_unused,2618 struct perf_sample *sample)2619{2620 char *msg;2621 void *args;2622 int printed = 0;2623 struct thread *thread;2624 int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;2625 int augmented_args_size = 0;2626 void *augmented_args = NULL;2627 struct syscall *sc = trace__syscall_info(trace, evsel, id);2628 struct thread_trace *ttrace;2629 2630 if (sc == NULL)2631 return -1;2632 2633 thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);2634 ttrace = thread__trace(thread, trace->output);2635 if (ttrace == NULL)2636 goto out_put;2637 2638 trace__fprintf_sample(trace, evsel, sample, thread);2639 2640 args = perf_evsel__sc_tp_ptr(evsel, args, sample);2641 2642 if (ttrace->entry_str == NULL) {2643 ttrace->entry_str = malloc(trace__entry_str_size);2644 if (!ttrace->entry_str)2645 goto out_put;2646 }2647 2648 if (!(trace->duration_filter || trace->summary_only || trace->min_stack))2649 trace__printf_interrupted_entry(trace);2650 /*2651 * If this is raw_syscalls.sys_enter, then it always comes with the 6 possible2652 * arguments, even if the syscall being handled, say "openat", uses only 4 arguments2653 * this breaks syscall__augmented_args() check for augmented args, as we calculate2654 * syscall->args_size using each syscalls:sys_enter_NAME tracefs format file,2655 * so when handling, say the openat syscall, we end up getting 6 args for the2656 * raw_syscalls:sys_enter event, when we expected just 4, we end up mistakenly2657 * thinking that the extra 2 u64 args are the augmented filename, so just check2658 * here and avoid using augmented syscalls when the evsel is the raw_syscalls one.2659 */2660 if (evsel != trace->syscalls.events.sys_enter)2661 augmented_args = syscall__augmented_args(sc, sample, &augmented_args_size, trace->raw_augmented_syscalls_args_size);2662 ttrace->entry_time = sample->time;2663 msg = ttrace->entry_str;2664 printed += scnprintf(msg + printed, trace__entry_str_size - printed, "%s(", sc->name);2665 2666 printed += syscall__scnprintf_args(sc, msg + printed, trace__entry_str_size - printed,2667 args, augmented_args, augmented_args_size, trace, thread);2668 2669 if (sc->is_exit) {2670 if (!(trace->duration_filter || trace->summary_only || trace->failure_only || trace->min_stack)) {2671 int alignment = 0;2672 2673 trace__fprintf_entry_head(trace, thread, 0, false, ttrace->entry_time, trace->output);2674 printed = fprintf(trace->output, "%s)", ttrace->entry_str);2675 if (trace->args_alignment > printed)2676 alignment = trace->args_alignment - printed;2677 fprintf(trace->output, "%*s= ?\n", alignment, " ");2678 }2679 } else {2680 ttrace->entry_pending = true;2681 /* See trace__vfs_getname & trace__sys_exit */2682 ttrace->filename.pending_open = false;2683 }2684 2685 if (trace->current != thread) {2686 thread__put(trace->current);2687 trace->current = thread__get(thread);2688 }2689 err = 0;2690out_put:2691 thread__put(thread);2692 return err;2693}2694 2695static int trace__fprintf_sys_enter(struct trace *trace, struct evsel *evsel,2696 struct perf_sample *sample)2697{2698 struct thread_trace *ttrace;2699 struct thread *thread;2700 int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;2701 struct syscall *sc = trace__syscall_info(trace, evsel, id);2702 char msg[1024];2703 void *args, *augmented_args = NULL;2704 int augmented_args_size;2705 2706 if (sc == NULL)2707 return -1;2708 2709 thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);2710 ttrace = thread__trace(thread, trace->output);2711 /*2712 * We need to get ttrace just to make sure it is there when syscall__scnprintf_args()2713 * and the rest of the beautifiers accessing it via struct syscall_arg touches it.2714 */2715 if (ttrace == NULL)2716 goto out_put;2717 2718 args = perf_evsel__sc_tp_ptr(evsel, args, sample);2719 augmented_args = syscall__augmented_args(sc, sample, &augmented_args_size, trace->raw_augmented_syscalls_args_size);2720 syscall__scnprintf_args(sc, msg, sizeof(msg), args, augmented_args, augmented_args_size, trace, thread);2721 fprintf(trace->output, "%s", msg);2722 err = 0;2723out_put:2724 thread__put(thread);2725 return err;2726}2727 2728static int trace__resolve_callchain(struct trace *trace, struct evsel *evsel,2729 struct perf_sample *sample,2730 struct callchain_cursor *cursor)2731{2732 struct addr_location al;2733 int max_stack = evsel->core.attr.sample_max_stack ?2734 evsel->core.attr.sample_max_stack :2735 trace->max_stack;2736 int err = -1;2737 2738 addr_location__init(&al);2739 if (machine__resolve(trace->host, &al, sample) < 0)2740 goto out;2741 2742 err = thread__resolve_callchain(al.thread, cursor, evsel, sample, NULL, NULL, max_stack);2743out:2744 addr_location__exit(&al);2745 return err;2746}2747 2748static int trace__fprintf_callchain(struct trace *trace, struct perf_sample *sample)2749{2750 /* TODO: user-configurable print_opts */2751 const unsigned int print_opts = EVSEL__PRINT_SYM |2752 EVSEL__PRINT_DSO |2753 EVSEL__PRINT_UNKNOWN_AS_ADDR;2754 2755 return sample__fprintf_callchain(sample, 38, print_opts, get_tls_callchain_cursor(), symbol_conf.bt_stop_list, trace->output);2756}2757 2758static const char *errno_to_name(struct evsel *evsel, int err)2759{2760 struct perf_env *env = evsel__env(evsel);2761 2762 return perf_env__arch_strerrno(env, err);2763}2764 2765static int trace__sys_exit(struct trace *trace, struct evsel *evsel,2766 union perf_event *event __maybe_unused,2767 struct perf_sample *sample)2768{2769 long ret;2770 u64 duration = 0;2771 bool duration_calculated = false;2772 struct thread *thread;2773 int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1, callchain_ret = 0, printed = 0;2774 int alignment = trace->args_alignment;2775 struct syscall *sc = trace__syscall_info(trace, evsel, id);2776 struct thread_trace *ttrace;2777 2778 if (sc == NULL)2779 return -1;2780 2781 thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);2782 ttrace = thread__trace(thread, trace->output);2783 if (ttrace == NULL)2784 goto out_put;2785 2786 trace__fprintf_sample(trace, evsel, sample, thread);2787 2788 ret = perf_evsel__sc_tp_uint(evsel, ret, sample);2789 2790 if (trace->summary)2791 thread__update_stats(thread, ttrace, id, sample, ret, trace->errno_summary);2792 2793 if (!trace->fd_path_disabled && sc->is_open && ret >= 0 && ttrace->filename.pending_open) {2794 trace__set_fd_pathname(thread, ret, ttrace->filename.name);2795 ttrace->filename.pending_open = false;2796 ++trace->stats.vfs_getname;2797 }2798 2799 if (ttrace->entry_time) {2800 duration = sample->time - ttrace->entry_time;2801 if (trace__filter_duration(trace, duration))2802 goto out;2803 duration_calculated = true;2804 } else if (trace->duration_filter)2805 goto out;2806 2807 if (sample->callchain) {2808 struct callchain_cursor *cursor = get_tls_callchain_cursor();2809 2810 callchain_ret = trace__resolve_callchain(trace, evsel, sample, cursor);2811 if (callchain_ret == 0) {2812 if (cursor->nr < trace->min_stack)2813 goto out;2814 callchain_ret = 1;2815 }2816 }2817 2818 if (trace->summary_only || (ret >= 0 && trace->failure_only))2819 goto out;2820 2821 trace__fprintf_entry_head(trace, thread, duration, duration_calculated, ttrace->entry_time, trace->output);2822 2823 if (ttrace->entry_pending) {2824 printed = fprintf(trace->output, "%s", ttrace->entry_str);2825 } else {2826 printed += fprintf(trace->output, " ... [");2827 color_fprintf(trace->output, PERF_COLOR_YELLOW, "continued");2828 printed += 9;2829 printed += fprintf(trace->output, "]: %s()", sc->name);2830 }2831 2832 printed++; /* the closing ')' */2833 2834 if (alignment > printed)2835 alignment -= printed;2836 else2837 alignment = 0;2838 2839 fprintf(trace->output, ")%*s= ", alignment, " ");2840 2841 if (sc->fmt == NULL) {2842 if (ret < 0)2843 goto errno_print;2844signed_print:2845 fprintf(trace->output, "%ld", ret);2846 } else if (ret < 0) {2847errno_print: {2848 char bf[STRERR_BUFSIZE];2849 const char *emsg = str_error_r(-ret, bf, sizeof(bf)),2850 *e = errno_to_name(evsel, -ret);2851 2852 fprintf(trace->output, "-1 %s (%s)", e, emsg);2853 }2854 } else if (ret == 0 && sc->fmt->timeout)2855 fprintf(trace->output, "0 (Timeout)");2856 else if (ttrace->ret_scnprintf) {2857 char bf[1024];2858 struct syscall_arg arg = {2859 .val = ret,2860 .thread = thread,2861 .trace = trace,2862 };2863 ttrace->ret_scnprintf(bf, sizeof(bf), &arg);2864 ttrace->ret_scnprintf = NULL;2865 fprintf(trace->output, "%s", bf);2866 } else if (sc->fmt->hexret)2867 fprintf(trace->output, "%#lx", ret);2868 else if (sc->fmt->errpid) {2869 struct thread *child = machine__find_thread(trace->host, ret, ret);2870 2871 if (child != NULL) {2872 fprintf(trace->output, "%ld", ret);2873 if (thread__comm_set(child))2874 fprintf(trace->output, " (%s)", thread__comm_str(child));2875 thread__put(child);2876 }2877 } else2878 goto signed_print;2879 2880 fputc('\n', trace->output);2881 2882 /*2883 * We only consider an 'event' for the sake of --max-events a non-filtered2884 * sys_enter + sys_exit and other tracepoint events.2885 */2886 if (++trace->nr_events_printed == trace->max_events && trace->max_events != ULONG_MAX)2887 interrupted = true;2888 2889 if (callchain_ret > 0)2890 trace__fprintf_callchain(trace, sample);2891 else if (callchain_ret < 0)2892 pr_err("Problem processing %s callchain, skipping...\n", evsel__name(evsel));2893out:2894 ttrace->entry_pending = false;2895 err = 0;2896out_put:2897 thread__put(thread);2898 return err;2899}2900 2901static int trace__vfs_getname(struct trace *trace, struct evsel *evsel,2902 union perf_event *event __maybe_unused,2903 struct perf_sample *sample)2904{2905 struct thread *thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);2906 struct thread_trace *ttrace;2907 size_t filename_len, entry_str_len, to_move;2908 ssize_t remaining_space;2909 char *pos;2910 const char *filename = evsel__rawptr(evsel, sample, "pathname");2911 2912 if (!thread)2913 goto out;2914 2915 ttrace = thread__priv(thread);2916 if (!ttrace)2917 goto out_put;2918 2919 filename_len = strlen(filename);2920 if (filename_len == 0)2921 goto out_put;2922 2923 if (ttrace->filename.namelen < filename_len) {2924 char *f = realloc(ttrace->filename.name, filename_len + 1);2925 2926 if (f == NULL)2927 goto out_put;2928 2929 ttrace->filename.namelen = filename_len;2930 ttrace->filename.name = f;2931 }2932 2933 strcpy(ttrace->filename.name, filename);2934 ttrace->filename.pending_open = true;2935 2936 if (!ttrace->filename.ptr)2937 goto out_put;2938 2939 entry_str_len = strlen(ttrace->entry_str);2940 remaining_space = trace__entry_str_size - entry_str_len - 1; /* \0 */2941 if (remaining_space <= 0)2942 goto out_put;2943 2944 if (filename_len > (size_t)remaining_space) {2945 filename += filename_len - remaining_space;2946 filename_len = remaining_space;2947 }2948 2949 to_move = entry_str_len - ttrace->filename.entry_str_pos + 1; /* \0 */2950 pos = ttrace->entry_str + ttrace->filename.entry_str_pos;2951 memmove(pos + filename_len, pos, to_move);2952 memcpy(pos, filename, filename_len);2953 2954 ttrace->filename.ptr = 0;2955 ttrace->filename.entry_str_pos = 0;2956out_put:2957 thread__put(thread);2958out:2959 return 0;2960}2961 2962static int trace__sched_stat_runtime(struct trace *trace, struct evsel *evsel,2963 union perf_event *event __maybe_unused,2964 struct perf_sample *sample)2965{2966 u64 runtime = evsel__intval(evsel, sample, "runtime");2967 double runtime_ms = (double)runtime / NSEC_PER_MSEC;2968 struct thread *thread = machine__findnew_thread(trace->host,2969 sample->pid,2970 sample->tid);2971 struct thread_trace *ttrace = thread__trace(thread, trace->output);2972 2973 if (ttrace == NULL)2974 goto out_dump;2975 2976 ttrace->runtime_ms += runtime_ms;2977 trace->runtime_ms += runtime_ms;2978out_put:2979 thread__put(thread);2980 return 0;2981 2982out_dump:2983 fprintf(trace->output, "%s: comm=%s,pid=%u,runtime=%" PRIu64 ",vruntime=%" PRIu64 ")\n",2984 evsel->name,2985 evsel__strval(evsel, sample, "comm"),2986 (pid_t)evsel__intval(evsel, sample, "pid"),2987 runtime,2988 evsel__intval(evsel, sample, "vruntime"));2989 goto out_put;2990}2991 2992static int bpf_output__printer(enum binary_printer_ops op,2993 unsigned int val, void *extra __maybe_unused, FILE *fp)2994{2995 unsigned char ch = (unsigned char)val;2996 2997 switch (op) {2998 case BINARY_PRINT_CHAR_DATA:2999 return fprintf(fp, "%c", isprint(ch) ? ch : '.');3000 case BINARY_PRINT_DATA_BEGIN:3001 case BINARY_PRINT_LINE_BEGIN:3002 case BINARY_PRINT_ADDR:3003 case BINARY_PRINT_NUM_DATA:3004 case BINARY_PRINT_NUM_PAD:3005 case BINARY_PRINT_SEP:3006 case BINARY_PRINT_CHAR_PAD:3007 case BINARY_PRINT_LINE_END:3008 case BINARY_PRINT_DATA_END:3009 default:3010 break;3011 }3012 3013 return 0;3014}3015 3016static void bpf_output__fprintf(struct trace *trace,3017 struct perf_sample *sample)3018{3019 binary__fprintf(sample->raw_data, sample->raw_size, 8,3020 bpf_output__printer, NULL, trace->output);3021 ++trace->nr_events_printed;3022}3023 3024static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel, struct perf_sample *sample,3025 struct thread *thread, void *augmented_args, int augmented_args_size)3026{3027 char bf[2048];3028 size_t size = sizeof(bf);3029 struct tep_format_field *field = evsel->tp_format->format.fields;3030 struct syscall_arg_fmt *arg = __evsel__syscall_arg_fmt(evsel);3031 size_t printed = 0, btf_printed;3032 unsigned long val;3033 u8 bit = 1;3034 struct syscall_arg syscall_arg = {3035 .augmented = {3036 .size = augmented_args_size,3037 .args = augmented_args,3038 },3039 .idx = 0,3040 .mask = 0,3041 .trace = trace,3042 .thread = thread,3043 .show_string_prefix = trace->show_string_prefix,3044 };3045 3046 for (; field && arg; field = field->next, ++syscall_arg.idx, bit <<= 1, ++arg) {3047 if (syscall_arg.mask & bit)3048 continue;3049 3050 syscall_arg.len = 0;3051 syscall_arg.fmt = arg;3052 if (field->flags & TEP_FIELD_IS_ARRAY) {3053 int offset = field->offset;3054 3055 if (field->flags & TEP_FIELD_IS_DYNAMIC) {3056 offset = format_field__intval(field, sample, evsel->needs_swap);3057 syscall_arg.len = offset >> 16;3058 offset &= 0xffff;3059 if (tep_field_is_relative(field->flags))3060 offset += field->offset + field->size;3061 }3062 3063 val = (uintptr_t)(sample->raw_data + offset);3064 } else3065 val = format_field__intval(field, sample, evsel->needs_swap);3066 /*3067 * Some syscall args need some mask, most don't and3068 * return val untouched.3069 */3070 val = syscall_arg_fmt__mask_val(arg, &syscall_arg, val);3071 3072 /* Suppress this argument if its value is zero and show_zero property isn't set. */3073 if (val == 0 && !trace->show_zeros && !arg->show_zero && arg->strtoul != STUL_BTF_TYPE)3074 continue;3075 3076 printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");3077 3078 if (trace->show_arg_names)3079 printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);3080 3081 btf_printed = trace__btf_scnprintf(trace, &syscall_arg, bf + printed, size - printed, val, field->type);3082 if (btf_printed) {3083 printed += btf_printed;3084 continue;3085 }3086 3087 printed += syscall_arg_fmt__scnprintf_val(arg, bf + printed, size - printed, &syscall_arg, val);3088 }3089 3090 return printed + fprintf(trace->output, "%s", bf);3091}3092 3093static int trace__event_handler(struct trace *trace, struct evsel *evsel,3094 union perf_event *event __maybe_unused,3095 struct perf_sample *sample)3096{3097 struct thread *thread;3098 int callchain_ret = 0;3099 /*3100 * Check if we called perf_evsel__disable(evsel) due to, for instance,3101 * this event's max_events having been hit and this is an entry coming3102 * from the ring buffer that we should discard, since the max events3103 * have already been considered/printed.3104 */3105 if (evsel->disabled)3106 return 0;3107 3108 thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);3109 3110 if (sample->callchain) {3111 struct callchain_cursor *cursor = get_tls_callchain_cursor();3112 3113 callchain_ret = trace__resolve_callchain(trace, evsel, sample, cursor);3114 if (callchain_ret == 0) {3115 if (cursor->nr < trace->min_stack)3116 goto out;3117 callchain_ret = 1;3118 }3119 }3120 3121 trace__printf_interrupted_entry(trace);3122 trace__fprintf_tstamp(trace, sample->time, trace->output);3123 3124 if (trace->trace_syscalls && trace->show_duration)3125 fprintf(trace->output, "( ): ");3126 3127 if (thread)3128 trace__fprintf_comm_tid(trace, thread, trace->output);3129 3130 if (evsel == trace->syscalls.events.bpf_output) {3131 int id = perf_evsel__sc_tp_uint(evsel, id, sample);3132 struct syscall *sc = trace__syscall_info(trace, evsel, id);3133 3134 if (sc) {3135 fprintf(trace->output, "%s(", sc->name);3136 trace__fprintf_sys_enter(trace, evsel, sample);3137 fputc(')', trace->output);3138 goto newline;3139 }3140 3141 /*3142 * XXX: Not having the associated syscall info or not finding/adding3143 * the thread should never happen, but if it does...3144 * fall thru and print it as a bpf_output event.3145 */3146 }3147 3148 fprintf(trace->output, "%s(", evsel->name);3149 3150 if (evsel__is_bpf_output(evsel)) {3151 bpf_output__fprintf(trace, sample);3152 } else if (evsel->tp_format) {3153 if (strncmp(evsel->tp_format->name, "sys_enter_", 10) ||3154 trace__fprintf_sys_enter(trace, evsel, sample)) {3155 if (trace->libtraceevent_print) {3156 event_format__fprintf(evsel->tp_format, sample->cpu,3157 sample->raw_data, sample->raw_size,3158 trace->output);3159 } else {3160 trace__fprintf_tp_fields(trace, evsel, sample, thread, NULL, 0);3161 }3162 }3163 }3164 3165newline:3166 fprintf(trace->output, ")\n");3167 3168 if (callchain_ret > 0)3169 trace__fprintf_callchain(trace, sample);3170 else if (callchain_ret < 0)3171 pr_err("Problem processing %s callchain, skipping...\n", evsel__name(evsel));3172 3173 ++trace->nr_events_printed;3174 3175 if (evsel->max_events != ULONG_MAX && ++evsel->nr_events_printed == evsel->max_events) {3176 evsel__disable(evsel);3177 evsel__close(evsel);3178 }3179out:3180 thread__put(thread);3181 return 0;3182}3183 3184static void print_location(FILE *f, struct perf_sample *sample,3185 struct addr_location *al,3186 bool print_dso, bool print_sym)3187{3188 3189 if ((verbose > 0 || print_dso) && al->map)3190 fprintf(f, "%s@", dso__long_name(map__dso(al->map)));3191 3192 if ((verbose > 0 || print_sym) && al->sym)3193 fprintf(f, "%s+0x%" PRIx64, al->sym->name,3194 al->addr - al->sym->start);3195 else if (al->map)3196 fprintf(f, "0x%" PRIx64, al->addr);3197 else3198 fprintf(f, "0x%" PRIx64, sample->addr);3199}3200 3201static int trace__pgfault(struct trace *trace,3202 struct evsel *evsel,3203 union perf_event *event __maybe_unused,3204 struct perf_sample *sample)3205{3206 struct thread *thread;3207 struct addr_location al;3208 char map_type = 'd';3209 struct thread_trace *ttrace;3210 int err = -1;3211 int callchain_ret = 0;3212 3213 addr_location__init(&al);3214 thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);3215 3216 if (sample->callchain) {3217 struct callchain_cursor *cursor = get_tls_callchain_cursor();3218 3219 callchain_ret = trace__resolve_callchain(trace, evsel, sample, cursor);3220 if (callchain_ret == 0) {3221 if (cursor->nr < trace->min_stack)3222 goto out_put;3223 callchain_ret = 1;3224 }3225 }3226 3227 ttrace = thread__trace(thread, trace->output);3228 if (ttrace == NULL)3229 goto out_put;3230 3231 if (evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ)3232 ttrace->pfmaj++;3233 else3234 ttrace->pfmin++;3235 3236 if (trace->summary_only)3237 goto out;3238 3239 thread__find_symbol(thread, sample->cpumode, sample->ip, &al);3240 3241 trace__fprintf_entry_head(trace, thread, 0, true, sample->time, trace->output);3242 3243 fprintf(trace->output, "%sfault [",3244 evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ?3245 "maj" : "min");3246 3247 print_location(trace->output, sample, &al, false, true);3248 3249 fprintf(trace->output, "] => ");3250 3251 thread__find_symbol(thread, sample->cpumode, sample->addr, &al);3252 3253 if (!al.map) {3254 thread__find_symbol(thread, sample->cpumode, sample->addr, &al);3255 3256 if (al.map)3257 map_type = 'x';3258 else3259 map_type = '?';3260 }3261 3262 print_location(trace->output, sample, &al, true, false);3263 3264 fprintf(trace->output, " (%c%c)\n", map_type, al.level);3265 3266 if (callchain_ret > 0)3267 trace__fprintf_callchain(trace, sample);3268 else if (callchain_ret < 0)3269 pr_err("Problem processing %s callchain, skipping...\n", evsel__name(evsel));3270 3271 ++trace->nr_events_printed;3272out:3273 err = 0;3274out_put:3275 thread__put(thread);3276 addr_location__exit(&al);3277 return err;3278}3279 3280static void trace__set_base_time(struct trace *trace,3281 struct evsel *evsel,3282 struct perf_sample *sample)3283{3284 /*3285 * BPF events were not setting PERF_SAMPLE_TIME, so be more robust3286 * and don't use sample->time unconditionally, we may end up having3287 * some other event in the future without PERF_SAMPLE_TIME for good3288 * reason, i.e. we may not be interested in its timestamps, just in3289 * it taking place, picking some piece of information when it3290 * appears in our event stream (vfs_getname comes to mind).3291 */3292 if (trace->base_time == 0 && !trace->full_time &&3293 (evsel->core.attr.sample_type & PERF_SAMPLE_TIME))3294 trace->base_time = sample->time;3295}3296 3297static int trace__process_sample(const struct perf_tool *tool,3298 union perf_event *event,3299 struct perf_sample *sample,3300 struct evsel *evsel,3301 struct machine *machine __maybe_unused)3302{3303 struct trace *trace = container_of(tool, struct trace, tool);3304 struct thread *thread;3305 int err = 0;3306 3307 tracepoint_handler handler = evsel->handler;3308 3309 thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);3310 if (thread && thread__is_filtered(thread))3311 goto out;3312 3313 trace__set_base_time(trace, evsel, sample);3314 3315 if (handler) {3316 ++trace->nr_events;3317 handler(trace, evsel, event, sample);3318 }3319out:3320 thread__put(thread);3321 return err;3322}3323 3324static int trace__record(struct trace *trace, int argc, const char **argv)3325{3326 unsigned int rec_argc, i, j;3327 const char **rec_argv;3328 const char * const record_args[] = {3329 "record",3330 "-R",3331 "-m", "1024",3332 "-c", "1",3333 };3334 pid_t pid = getpid();3335 char *filter = asprintf__tp_filter_pids(1, &pid);3336 const char * const sc_args[] = { "-e", };3337 unsigned int sc_args_nr = ARRAY_SIZE(sc_args);3338 const char * const majpf_args[] = { "-e", "major-faults" };3339 unsigned int majpf_args_nr = ARRAY_SIZE(majpf_args);3340 const char * const minpf_args[] = { "-e", "minor-faults" };3341 unsigned int minpf_args_nr = ARRAY_SIZE(minpf_args);3342 int err = -1;3343 3344 /* +3 is for the event string below and the pid filter */3345 rec_argc = ARRAY_SIZE(record_args) + sc_args_nr + 3 +3346 majpf_args_nr + minpf_args_nr + argc;3347 rec_argv = calloc(rec_argc + 1, sizeof(char *));3348 3349 if (rec_argv == NULL || filter == NULL)3350 goto out_free;3351 3352 j = 0;3353 for (i = 0; i < ARRAY_SIZE(record_args); i++)3354 rec_argv[j++] = record_args[i];3355 3356 if (trace->trace_syscalls) {3357 for (i = 0; i < sc_args_nr; i++)3358 rec_argv[j++] = sc_args[i];3359 3360 /* event string may be different for older kernels - e.g., RHEL6 */3361 if (is_valid_tracepoint("raw_syscalls:sys_enter"))3362 rec_argv[j++] = "raw_syscalls:sys_enter,raw_syscalls:sys_exit";3363 else if (is_valid_tracepoint("syscalls:sys_enter"))3364 rec_argv[j++] = "syscalls:sys_enter,syscalls:sys_exit";3365 else {3366 pr_err("Neither raw_syscalls nor syscalls events exist.\n");3367 goto out_free;3368 }3369 }3370 3371 rec_argv[j++] = "--filter";3372 rec_argv[j++] = filter;3373 3374 if (trace->trace_pgfaults & TRACE_PFMAJ)3375 for (i = 0; i < majpf_args_nr; i++)3376 rec_argv[j++] = majpf_args[i];3377 3378 if (trace->trace_pgfaults & TRACE_PFMIN)3379 for (i = 0; i < minpf_args_nr; i++)3380 rec_argv[j++] = minpf_args[i];3381 3382 for (i = 0; i < (unsigned int)argc; i++)3383 rec_argv[j++] = argv[i];3384 3385 err = cmd_record(j, rec_argv);3386out_free:3387 free(filter);3388 free(rec_argv);3389 return err;3390}3391 3392static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);3393 3394static bool evlist__add_vfs_getname(struct evlist *evlist)3395{3396 bool found = false;3397 struct evsel *evsel, *tmp;3398 struct parse_events_error err;3399 int ret;3400 3401 parse_events_error__init(&err);3402 ret = parse_events(evlist, "probe:vfs_getname*", &err);3403 parse_events_error__exit(&err);3404 if (ret)3405 return false;3406 3407 evlist__for_each_entry_safe(evlist, evsel, tmp) {3408 if (!strstarts(evsel__name(evsel), "probe:vfs_getname"))3409 continue;3410 3411 if (evsel__field(evsel, "pathname")) {3412 evsel->handler = trace__vfs_getname;3413 found = true;3414 continue;3415 }3416 3417 list_del_init(&evsel->core.node);3418 evsel->evlist = NULL;3419 evsel__delete(evsel);3420 }3421 3422 return found;3423}3424 3425static struct evsel *evsel__new_pgfault(u64 config)3426{3427 struct evsel *evsel;3428 struct perf_event_attr attr = {3429 .type = PERF_TYPE_SOFTWARE,3430 .mmap_data = 1,3431 };3432 3433 attr.config = config;3434 attr.sample_period = 1;3435 3436 event_attr_init(&attr);3437 3438 evsel = evsel__new(&attr);3439 if (evsel)3440 evsel->handler = trace__pgfault;3441 3442 return evsel;3443}3444 3445static void evlist__free_syscall_tp_fields(struct evlist *evlist)3446{3447 struct evsel *evsel;3448 3449 evlist__for_each_entry(evlist, evsel) {3450 evsel_trace__delete(evsel->priv);3451 evsel->priv = NULL;3452 }3453}3454 3455static void trace__handle_event(struct trace *trace, union perf_event *event, struct perf_sample *sample)3456{3457 const u32 type = event->header.type;3458 struct evsel *evsel;3459 3460 if (type != PERF_RECORD_SAMPLE) {3461 trace__process_event(trace, trace->host, event, sample);3462 return;3463 }3464 3465 evsel = evlist__id2evsel(trace->evlist, sample->id);3466 if (evsel == NULL) {3467 fprintf(trace->output, "Unknown tp ID %" PRIu64 ", skipping...\n", sample->id);3468 return;3469 }3470 3471 if (evswitch__discard(&trace->evswitch, evsel))3472 return;3473 3474 trace__set_base_time(trace, evsel, sample);3475 3476 if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&3477 sample->raw_data == NULL) {3478 fprintf(trace->output, "%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",3479 evsel__name(evsel), sample->tid,3480 sample->cpu, sample->raw_size);3481 } else {3482 tracepoint_handler handler = evsel->handler;3483 handler(trace, evsel, event, sample);3484 }3485 3486 if (trace->nr_events_printed >= trace->max_events && trace->max_events != ULONG_MAX)3487 interrupted = true;3488}3489 3490static int trace__add_syscall_newtp(struct trace *trace)3491{3492 int ret = -1;3493 struct evlist *evlist = trace->evlist;3494 struct evsel *sys_enter, *sys_exit;3495 3496 sys_enter = perf_evsel__raw_syscall_newtp("sys_enter", trace__sys_enter);3497 if (sys_enter == NULL)3498 goto out;3499 3500 if (perf_evsel__init_sc_tp_ptr_field(sys_enter, args))3501 goto out_delete_sys_enter;3502 3503 sys_exit = perf_evsel__raw_syscall_newtp("sys_exit", trace__sys_exit);3504 if (sys_exit == NULL)3505 goto out_delete_sys_enter;3506 3507 if (perf_evsel__init_sc_tp_uint_field(sys_exit, ret))3508 goto out_delete_sys_exit;3509 3510 evsel__config_callchain(sys_enter, &trace->opts, &callchain_param);3511 evsel__config_callchain(sys_exit, &trace->opts, &callchain_param);3512 3513 evlist__add(evlist, sys_enter);3514 evlist__add(evlist, sys_exit);3515 3516 if (callchain_param.enabled && !trace->kernel_syscallchains) {3517 /*3518 * We're interested only in the user space callchain3519 * leading to the syscall, allow overriding that for3520 * debugging reasons using --kernel_syscall_callchains3521 */3522 sys_exit->core.attr.exclude_callchain_kernel = 1;3523 }3524 3525 trace->syscalls.events.sys_enter = sys_enter;3526 trace->syscalls.events.sys_exit = sys_exit;3527 3528 ret = 0;3529out:3530 return ret;3531 3532out_delete_sys_exit:3533 evsel__delete_priv(sys_exit);3534out_delete_sys_enter:3535 evsel__delete_priv(sys_enter);3536 goto out;3537}3538 3539static int trace__set_ev_qualifier_tp_filter(struct trace *trace)3540{3541 int err = -1;3542 struct evsel *sys_exit;3543 char *filter = asprintf_expr_inout_ints("id", !trace->not_ev_qualifier,3544 trace->ev_qualifier_ids.nr,3545 trace->ev_qualifier_ids.entries);3546 3547 if (filter == NULL)3548 goto out_enomem;3549 3550 if (!evsel__append_tp_filter(trace->syscalls.events.sys_enter, filter)) {3551 sys_exit = trace->syscalls.events.sys_exit;3552 err = evsel__append_tp_filter(sys_exit, filter);3553 }3554 3555 free(filter);3556out:3557 return err;3558out_enomem:3559 errno = ENOMEM;3560 goto out;3561}3562 3563#ifdef HAVE_BPF_SKEL3564static int syscall_arg_fmt__cache_btf_struct(struct syscall_arg_fmt *arg_fmt, struct btf *btf, char *type)3565{3566 int id;3567 3568 if (arg_fmt->type != NULL)3569 return -1;3570 3571 id = btf__find_by_name(btf, type);3572 if (id < 0)3573 return -1;3574 3575 arg_fmt->type = btf__type_by_id(btf, id);3576 arg_fmt->type_id = id;3577 3578 return 0;3579}3580 3581static struct bpf_program *trace__find_bpf_program_by_title(struct trace *trace, const char *name)3582{3583 struct bpf_program *pos, *prog = NULL;3584 const char *sec_name;3585 3586 if (trace->skel->obj == NULL)3587 return NULL;3588 3589 bpf_object__for_each_program(pos, trace->skel->obj) {3590 sec_name = bpf_program__section_name(pos);3591 if (sec_name && !strcmp(sec_name, name)) {3592 prog = pos;3593 break;3594 }3595 }3596 3597 return prog;3598}3599 3600static struct bpf_program *trace__find_syscall_bpf_prog(struct trace *trace, struct syscall *sc,3601 const char *prog_name, const char *type)3602{3603 struct bpf_program *prog;3604 3605 if (prog_name == NULL) {3606 char default_prog_name[256];3607 scnprintf(default_prog_name, sizeof(default_prog_name), "tp/syscalls/sys_%s_%s", type, sc->name);3608 prog = trace__find_bpf_program_by_title(trace, default_prog_name);3609 if (prog != NULL)3610 goto out_found;3611 if (sc->fmt && sc->fmt->alias) {3612 scnprintf(default_prog_name, sizeof(default_prog_name), "tp/syscalls/sys_%s_%s", type, sc->fmt->alias);3613 prog = trace__find_bpf_program_by_title(trace, default_prog_name);3614 if (prog != NULL)3615 goto out_found;3616 }3617 goto out_unaugmented;3618 }3619 3620 prog = trace__find_bpf_program_by_title(trace, prog_name);3621 3622 if (prog != NULL) {3623out_found:3624 return prog;3625 }3626 3627 pr_debug("Couldn't find BPF prog \"%s\" to associate with syscalls:sys_%s_%s, not augmenting it\n",3628 prog_name, type, sc->name);3629out_unaugmented:3630 return trace->skel->progs.syscall_unaugmented;3631}3632 3633static void trace__init_syscall_bpf_progs(struct trace *trace, int id)3634{3635 struct syscall *sc = trace__syscall_info(trace, NULL, id);3636 3637 if (sc == NULL)3638 return;3639 3640 sc->bpf_prog.sys_enter = trace__find_syscall_bpf_prog(trace, sc, sc->fmt ? sc->fmt->bpf_prog_name.sys_enter : NULL, "enter");3641 sc->bpf_prog.sys_exit = trace__find_syscall_bpf_prog(trace, sc, sc->fmt ? sc->fmt->bpf_prog_name.sys_exit : NULL, "exit");3642}3643 3644static int trace__bpf_prog_sys_enter_fd(struct trace *trace, int id)3645{3646 struct syscall *sc = trace__syscall_info(trace, NULL, id);3647 return sc ? bpf_program__fd(sc->bpf_prog.sys_enter) : bpf_program__fd(trace->skel->progs.syscall_unaugmented);3648}3649 3650static int trace__bpf_prog_sys_exit_fd(struct trace *trace, int id)3651{3652 struct syscall *sc = trace__syscall_info(trace, NULL, id);3653 return sc ? bpf_program__fd(sc->bpf_prog.sys_exit) : bpf_program__fd(trace->skel->progs.syscall_unaugmented);3654}3655 3656static int trace__bpf_sys_enter_beauty_map(struct trace *trace, int key, unsigned int *beauty_array)3657{3658 struct tep_format_field *field;3659 struct syscall *sc = trace__syscall_info(trace, NULL, key);3660 const struct btf_type *bt;3661 char *struct_offset, *tmp, name[32];3662 bool can_augment = false;3663 int i, cnt;3664 3665 if (sc == NULL)3666 return -1;3667 3668 trace__load_vmlinux_btf(trace);3669 if (trace->btf == NULL)3670 return -1;3671 3672 for (i = 0, field = sc->args; field; ++i, field = field->next) {3673 // XXX We're only collecting pointer payloads _from_ user space3674 if (!sc->arg_fmt[i].from_user)3675 continue;3676 3677 struct_offset = strstr(field->type, "struct ");3678 if (struct_offset == NULL)3679 struct_offset = strstr(field->type, "union ");3680 else3681 struct_offset++; // "union" is shorter3682 3683 if (field->flags & TEP_FIELD_IS_POINTER && struct_offset) { /* struct or union (think BPF's attr arg) */3684 struct_offset += 6;3685 3686 /* for 'struct foo *', we only want 'foo' */3687 for (tmp = struct_offset, cnt = 0; *tmp != ' ' && *tmp != '\0'; ++tmp, ++cnt) {3688 }3689 3690 strncpy(name, struct_offset, cnt);3691 name[cnt] = '\0';3692 3693 /* cache struct's btf_type and type_id */3694 if (syscall_arg_fmt__cache_btf_struct(&sc->arg_fmt[i], trace->btf, name))3695 continue;3696 3697 bt = sc->arg_fmt[i].type;3698 beauty_array[i] = bt->size;3699 can_augment = true;3700 } else if (field->flags & TEP_FIELD_IS_POINTER && /* string */3701 strcmp(field->type, "const char *") == 0 &&3702 (strstr(field->name, "name") ||3703 strstr(field->name, "path") ||3704 strstr(field->name, "file") ||3705 strstr(field->name, "root") ||3706 strstr(field->name, "key") ||3707 strstr(field->name, "special") ||3708 strstr(field->name, "type") ||3709 strstr(field->name, "description"))) {3710 beauty_array[i] = 1;3711 can_augment = true;3712 } else if (field->flags & TEP_FIELD_IS_POINTER && /* buffer */3713 strstr(field->type, "char *") &&3714 (strstr(field->name, "buf") ||3715 strstr(field->name, "val") ||3716 strstr(field->name, "msg"))) {3717 int j;3718 struct tep_format_field *field_tmp;3719 3720 /* find the size of the buffer that appears in pairs with buf */3721 for (j = 0, field_tmp = sc->args; field_tmp; ++j, field_tmp = field_tmp->next) {3722 if (!(field_tmp->flags & TEP_FIELD_IS_POINTER) && /* only integers */3723 (strstr(field_tmp->name, "count") ||3724 strstr(field_tmp->name, "siz") || /* size, bufsiz */3725 (strstr(field_tmp->name, "len") && strcmp(field_tmp->name, "filename")))) {3726 /* filename's got 'len' in it, we don't want that */3727 beauty_array[i] = -(j + 1);3728 can_augment = true;3729 break;3730 }3731 }3732 }3733 }3734 3735 if (can_augment)3736 return 0;3737 3738 return -1;3739}3740 3741static struct bpf_program *trace__find_usable_bpf_prog_entry(struct trace *trace, struct syscall *sc)3742{3743 struct tep_format_field *field, *candidate_field;3744 /*3745 * We're only interested in syscalls that have a pointer:3746 */3747 for (field = sc->args; field; field = field->next) {3748 if (field->flags & TEP_FIELD_IS_POINTER)3749 goto try_to_find_pair;3750 }3751 3752 return NULL;3753 3754try_to_find_pair:3755 for (int i = 0; i < trace->sctbl->syscalls.nr_entries; ++i) {3756 int id = syscalltbl__id_at_idx(trace->sctbl, i);3757 struct syscall *pair = trace__syscall_info(trace, NULL, id);3758 struct bpf_program *pair_prog;3759 bool is_candidate = false;3760 3761 if (pair == NULL || pair == sc ||3762 pair->bpf_prog.sys_enter == trace->skel->progs.syscall_unaugmented)3763 continue;3764 3765 for (field = sc->args, candidate_field = pair->args;3766 field && candidate_field; field = field->next, candidate_field = candidate_field->next) {3767 bool is_pointer = field->flags & TEP_FIELD_IS_POINTER,3768 candidate_is_pointer = candidate_field->flags & TEP_FIELD_IS_POINTER;3769 3770 if (is_pointer) {3771 if (!candidate_is_pointer) {3772 // The candidate just doesn't copies our pointer arg, might copy other pointers we want.3773 continue;3774 }3775 } else {3776 if (candidate_is_pointer) {3777 // The candidate might copy a pointer we don't have, skip it.3778 goto next_candidate;3779 }3780 continue;3781 }3782 3783 if (strcmp(field->type, candidate_field->type))3784 goto next_candidate;3785 3786 /*3787 * This is limited in the BPF program but sys_write3788 * uses "const char *" for its "buf" arg so we need to3789 * use some heuristic that is kinda future proof...3790 */3791 if (strcmp(field->type, "const char *") == 0 &&3792 !(strstr(field->name, "name") ||3793 strstr(field->name, "path") ||3794 strstr(field->name, "file") ||3795 strstr(field->name, "root") ||3796 strstr(field->name, "description")))3797 goto next_candidate;3798 3799 is_candidate = true;3800 }3801 3802 if (!is_candidate)3803 goto next_candidate;3804 3805 /*3806 * Check if the tentative pair syscall augmenter has more pointers, if it has,3807 * then it may be collecting that and we then can't use it, as it would collect3808 * more than what is common to the two syscalls.3809 */3810 if (candidate_field) {3811 for (candidate_field = candidate_field->next; candidate_field; candidate_field = candidate_field->next)3812 if (candidate_field->flags & TEP_FIELD_IS_POINTER)3813 goto next_candidate;3814 }3815 3816 pair_prog = pair->bpf_prog.sys_enter;3817 /*3818 * If the pair isn't enabled, then its bpf_prog.sys_enter will not3819 * have been searched for, so search it here and if it returns the3820 * unaugmented one, then ignore it, otherwise we'll reuse that BPF3821 * program for a filtered syscall on a non-filtered one.3822 *3823 * For instance, we have "!syscalls:sys_enter_renameat" and that is3824 * useful for "renameat2".3825 */3826 if (pair_prog == NULL) {3827 pair_prog = trace__find_syscall_bpf_prog(trace, pair, pair->fmt ? pair->fmt->bpf_prog_name.sys_enter : NULL, "enter");3828 if (pair_prog == trace->skel->progs.syscall_unaugmented)3829 goto next_candidate;3830 }3831 3832 pr_debug("Reusing \"%s\" BPF sys_enter augmenter for \"%s\"\n", pair->name, sc->name);3833 return pair_prog;3834 next_candidate:3835 continue;3836 }3837 3838 return NULL;3839}3840 3841static int trace__init_syscalls_bpf_prog_array_maps(struct trace *trace)3842{3843 int map_enter_fd = bpf_map__fd(trace->skel->maps.syscalls_sys_enter);3844 int map_exit_fd = bpf_map__fd(trace->skel->maps.syscalls_sys_exit);3845 int beauty_map_fd = bpf_map__fd(trace->skel->maps.beauty_map_enter);3846 int err = 0;3847 unsigned int beauty_array[6];3848 3849 for (int i = 0; i < trace->sctbl->syscalls.nr_entries; ++i) {3850 int prog_fd, key = syscalltbl__id_at_idx(trace->sctbl, i);3851 3852 if (!trace__syscall_enabled(trace, key))3853 continue;3854 3855 trace__init_syscall_bpf_progs(trace, key);3856 3857 // It'll get at least the "!raw_syscalls:unaugmented"3858 prog_fd = trace__bpf_prog_sys_enter_fd(trace, key);3859 err = bpf_map_update_elem(map_enter_fd, &key, &prog_fd, BPF_ANY);3860 if (err)3861 break;3862 prog_fd = trace__bpf_prog_sys_exit_fd(trace, key);3863 err = bpf_map_update_elem(map_exit_fd, &key, &prog_fd, BPF_ANY);3864 if (err)3865 break;3866 3867 /* use beauty_map to tell BPF how many bytes to collect, set beauty_map's value here */3868 memset(beauty_array, 0, sizeof(beauty_array));3869 err = trace__bpf_sys_enter_beauty_map(trace, key, (unsigned int *)beauty_array);3870 if (err)3871 continue;3872 err = bpf_map_update_elem(beauty_map_fd, &key, beauty_array, BPF_ANY);3873 if (err)3874 break;3875 }3876 3877 /*3878 * Now lets do a second pass looking for enabled syscalls without3879 * an augmenter that have a signature that is a superset of another3880 * syscall with an augmenter so that we can auto-reuse it.3881 *3882 * I.e. if we have an augmenter for the "open" syscall that has3883 * this signature:3884 *3885 * int open(const char *pathname, int flags, mode_t mode);3886 *3887 * I.e. that will collect just the first string argument, then we3888 * can reuse it for the 'creat' syscall, that has this signature:3889 *3890 * int creat(const char *pathname, mode_t mode);3891 *3892 * and for:3893 *3894 * int stat(const char *pathname, struct stat *statbuf);3895 * int lstat(const char *pathname, struct stat *statbuf);3896 *3897 * Because the 'open' augmenter will collect the first arg as a string,3898 * and leave alone all the other args, which already helps with3899 * beautifying 'stat' and 'lstat''s pathname arg.3900 *3901 * Then, in time, when 'stat' gets an augmenter that collects both3902 * first and second arg (this one on the raw_syscalls:sys_exit prog3903 * array tail call, then that one will be used.3904 */3905 for (int i = 0; i < trace->sctbl->syscalls.nr_entries; ++i) {3906 int key = syscalltbl__id_at_idx(trace->sctbl, i);3907 struct syscall *sc = trace__syscall_info(trace, NULL, key);3908 struct bpf_program *pair_prog;3909 int prog_fd;3910 3911 if (sc == NULL || sc->bpf_prog.sys_enter == NULL)3912 continue;3913 3914 /*3915 * For now we're just reusing the sys_enter prog, and if it3916 * already has an augmenter, we don't need to find one.3917 */3918 if (sc->bpf_prog.sys_enter != trace->skel->progs.syscall_unaugmented)3919 continue;3920 3921 /*3922 * Look at all the other syscalls for one that has a signature3923 * that is close enough that we can share:3924 */3925 pair_prog = trace__find_usable_bpf_prog_entry(trace, sc);3926 if (pair_prog == NULL)3927 continue;3928 3929 sc->bpf_prog.sys_enter = pair_prog;3930 3931 /*3932 * Update the BPF_MAP_TYPE_PROG_SHARED for raw_syscalls:sys_enter3933 * with the fd for the program we're reusing:3934 */3935 prog_fd = bpf_program__fd(sc->bpf_prog.sys_enter);3936 err = bpf_map_update_elem(map_enter_fd, &key, &prog_fd, BPF_ANY);3937 if (err)3938 break;3939 }3940 3941 return err;3942}3943#endif // HAVE_BPF_SKEL3944 3945static int trace__set_ev_qualifier_filter(struct trace *trace)3946{3947 if (trace->syscalls.events.sys_enter)3948 return trace__set_ev_qualifier_tp_filter(trace);3949 return 0;3950}3951 3952static int bpf_map__set_filter_pids(struct bpf_map *map __maybe_unused,3953 size_t npids __maybe_unused, pid_t *pids __maybe_unused)3954{3955 int err = 0;3956#ifdef HAVE_LIBBPF_SUPPORT3957 bool value = true;3958 int map_fd = bpf_map__fd(map);3959 size_t i;3960 3961 for (i = 0; i < npids; ++i) {3962 err = bpf_map_update_elem(map_fd, &pids[i], &value, BPF_ANY);3963 if (err)3964 break;3965 }3966#endif3967 return err;3968}3969 3970static int trace__set_filter_loop_pids(struct trace *trace)3971{3972 unsigned int nr = 1, err;3973 pid_t pids[32] = {3974 getpid(),3975 };3976 struct thread *thread = machine__find_thread(trace->host, pids[0], pids[0]);3977 3978 while (thread && nr < ARRAY_SIZE(pids)) {3979 struct thread *parent = machine__find_thread(trace->host,3980 thread__ppid(thread),3981 thread__ppid(thread));3982 3983 if (parent == NULL)3984 break;3985 3986 if (!strcmp(thread__comm_str(parent), "sshd") ||3987 strstarts(thread__comm_str(parent), "gnome-terminal")) {3988 pids[nr++] = thread__tid(parent);3989 break;3990 }3991 thread = parent;3992 }3993 3994 err = evlist__append_tp_filter_pids(trace->evlist, nr, pids);3995 if (!err && trace->filter_pids.map)3996 err = bpf_map__set_filter_pids(trace->filter_pids.map, nr, pids);3997 3998 return err;3999}4000 4001static int trace__set_filter_pids(struct trace *trace)4002{4003 int err = 0;4004 /*4005 * Better not use !target__has_task() here because we need to cover the4006 * case where no threads were specified in the command line, but a4007 * workload was, and in that case we will fill in the thread_map when4008 * we fork the workload in evlist__prepare_workload.4009 */4010 if (trace->filter_pids.nr > 0) {4011 err = evlist__append_tp_filter_pids(trace->evlist, trace->filter_pids.nr,4012 trace->filter_pids.entries);4013 if (!err && trace->filter_pids.map) {4014 err = bpf_map__set_filter_pids(trace->filter_pids.map, trace->filter_pids.nr,4015 trace->filter_pids.entries);4016 }4017 } else if (perf_thread_map__pid(trace->evlist->core.threads, 0) == -1) {4018 err = trace__set_filter_loop_pids(trace);4019 }4020 4021 return err;4022}4023 4024static int __trace__deliver_event(struct trace *trace, union perf_event *event)4025{4026 struct evlist *evlist = trace->evlist;4027 struct perf_sample sample;4028 int err = evlist__parse_sample(evlist, event, &sample);4029 4030 if (err)4031 fprintf(trace->output, "Can't parse sample, err = %d, skipping...\n", err);4032 else4033 trace__handle_event(trace, event, &sample);4034 4035 return 0;4036}4037 4038static int __trace__flush_events(struct trace *trace)4039{4040 u64 first = ordered_events__first_time(&trace->oe.data);4041 u64 flush = trace->oe.last - NSEC_PER_SEC;4042 4043 /* Is there some thing to flush.. */4044 if (first && first < flush)4045 return ordered_events__flush_time(&trace->oe.data, flush);4046 4047 return 0;4048}4049 4050static int trace__flush_events(struct trace *trace)4051{4052 return !trace->sort_events ? 0 : __trace__flush_events(trace);4053}4054 4055static int trace__deliver_event(struct trace *trace, union perf_event *event)4056{4057 int err;4058 4059 if (!trace->sort_events)4060 return __trace__deliver_event(trace, event);4061 4062 err = evlist__parse_sample_timestamp(trace->evlist, event, &trace->oe.last);4063 if (err && err != -1)4064 return err;4065 4066 err = ordered_events__queue(&trace->oe.data, event, trace->oe.last, 0, NULL);4067 if (err)4068 return err;4069 4070 return trace__flush_events(trace);4071}4072 4073static int ordered_events__deliver_event(struct ordered_events *oe,4074 struct ordered_event *event)4075{4076 struct trace *trace = container_of(oe, struct trace, oe.data);4077 4078 return __trace__deliver_event(trace, event->event);4079}4080 4081static struct syscall_arg_fmt *evsel__find_syscall_arg_fmt_by_name(struct evsel *evsel, char *arg,4082 char **type)4083{4084 struct tep_format_field *field;4085 struct syscall_arg_fmt *fmt = __evsel__syscall_arg_fmt(evsel);4086 4087 if (evsel->tp_format == NULL || fmt == NULL)4088 return NULL;4089 4090 for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt)4091 if (strcmp(field->name, arg) == 0) {4092 *type = field->type;4093 return fmt;4094 }4095 4096 return NULL;4097}4098 4099static int trace__expand_filter(struct trace *trace, struct evsel *evsel)4100{4101 char *tok, *left = evsel->filter, *new_filter = evsel->filter;4102 4103 while ((tok = strpbrk(left, "=<>!")) != NULL) {4104 char *right = tok + 1, *right_end;4105 4106 if (*right == '=')4107 ++right;4108 4109 while (isspace(*right))4110 ++right;4111 4112 if (*right == '\0')4113 break;4114 4115 while (!isalpha(*left))4116 if (++left == tok) {4117 /*4118 * Bail out, can't find the name of the argument that is being4119 * used in the filter, let it try to set this filter, will fail later.4120 */4121 return 0;4122 }4123 4124 right_end = right + 1;4125 while (isalnum(*right_end) || *right_end == '_' || *right_end == '|')4126 ++right_end;4127 4128 if (isalpha(*right)) {4129 struct syscall_arg_fmt *fmt;4130 int left_size = tok - left,4131 right_size = right_end - right;4132 char arg[128], *type;4133 4134 while (isspace(left[left_size - 1]))4135 --left_size;4136 4137 scnprintf(arg, sizeof(arg), "%.*s", left_size, left);4138 4139 fmt = evsel__find_syscall_arg_fmt_by_name(evsel, arg, &type);4140 if (fmt == NULL) {4141 pr_err("\"%s\" not found in \"%s\", can't set filter \"%s\"\n",4142 arg, evsel->name, evsel->filter);4143 return -1;4144 }4145 4146 pr_debug2("trying to expand \"%s\" \"%.*s\" \"%.*s\" -> ",4147 arg, (int)(right - tok), tok, right_size, right);4148 4149 if (fmt->strtoul) {4150 u64 val;4151 struct syscall_arg syscall_arg = {4152 .trace = trace,4153 .fmt = fmt,4154 .type_name = type,4155 .parm = fmt->parm,4156 };4157 4158 if (fmt->strtoul(right, right_size, &syscall_arg, &val)) {4159 char *n, expansion[19];4160 int expansion_lenght = scnprintf(expansion, sizeof(expansion), "%#" PRIx64, val);4161 int expansion_offset = right - new_filter;4162 4163 pr_debug("%s", expansion);4164 4165 if (asprintf(&n, "%.*s%s%s", expansion_offset, new_filter, expansion, right_end) < 0) {4166 pr_debug(" out of memory!\n");4167 free(new_filter);4168 return -1;4169 }4170 if (new_filter != evsel->filter)4171 free(new_filter);4172 left = n + expansion_offset + expansion_lenght;4173 new_filter = n;4174 } else {4175 pr_err("\"%.*s\" not found for \"%s\" in \"%s\", can't set filter \"%s\"\n",4176 right_size, right, arg, evsel->name, evsel->filter);4177 return -1;4178 }4179 } else {4180 pr_err("No resolver (strtoul) for \"%s\" in \"%s\", can't set filter \"%s\"\n",4181 arg, evsel->name, evsel->filter);4182 return -1;4183 }4184 4185 pr_debug("\n");4186 } else {4187 left = right_end;4188 }4189 }4190 4191 if (new_filter != evsel->filter) {4192 pr_debug("New filter for %s: %s\n", evsel->name, new_filter);4193 evsel__set_filter(evsel, new_filter);4194 free(new_filter);4195 }4196 4197 return 0;4198}4199 4200static int trace__expand_filters(struct trace *trace, struct evsel **err_evsel)4201{4202 struct evlist *evlist = trace->evlist;4203 struct evsel *evsel;4204 4205 evlist__for_each_entry(evlist, evsel) {4206 if (evsel->filter == NULL)4207 continue;4208 4209 if (trace__expand_filter(trace, evsel)) {4210 *err_evsel = evsel;4211 return -1;4212 }4213 }4214 4215 return 0;4216}4217 4218static int trace__run(struct trace *trace, int argc, const char **argv)4219{4220 struct evlist *evlist = trace->evlist;4221 struct evsel *evsel, *pgfault_maj = NULL, *pgfault_min = NULL;4222 int err = -1, i;4223 unsigned long before;4224 const bool forks = argc > 0;4225 bool draining = false;4226 4227 trace->live = true;4228 4229 if (!trace->raw_augmented_syscalls) {4230 if (trace->trace_syscalls && trace__add_syscall_newtp(trace))4231 goto out_error_raw_syscalls;4232 4233 if (trace->trace_syscalls)4234 trace->vfs_getname = evlist__add_vfs_getname(evlist);4235 }4236 4237 if ((trace->trace_pgfaults & TRACE_PFMAJ)) {4238 pgfault_maj = evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MAJ);4239 if (pgfault_maj == NULL)4240 goto out_error_mem;4241 evsel__config_callchain(pgfault_maj, &trace->opts, &callchain_param);4242 evlist__add(evlist, pgfault_maj);4243 }4244 4245 if ((trace->trace_pgfaults & TRACE_PFMIN)) {4246 pgfault_min = evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MIN);4247 if (pgfault_min == NULL)4248 goto out_error_mem;4249 evsel__config_callchain(pgfault_min, &trace->opts, &callchain_param);4250 evlist__add(evlist, pgfault_min);4251 }4252 4253 /* Enable ignoring missing threads when -u/-p option is defined. */4254 trace->opts.ignore_missing_thread = trace->opts.target.uid != UINT_MAX || trace->opts.target.pid;4255 4256 if (trace->sched &&4257 evlist__add_newtp(evlist, "sched", "sched_stat_runtime", trace__sched_stat_runtime))4258 goto out_error_sched_stat_runtime;4259 /*4260 * If a global cgroup was set, apply it to all the events without an4261 * explicit cgroup. I.e.:4262 *4263 * trace -G A -e sched:*switch4264 *4265 * Will set all raw_syscalls:sys_{enter,exit}, pgfault, vfs_getname, etc4266 * _and_ sched:sched_switch to the 'A' cgroup, while:4267 *4268 * trace -e sched:*switch -G A4269 *4270 * will only set the sched:sched_switch event to the 'A' cgroup, all the4271 * other events (raw_syscalls:sys_{enter,exit}, etc are left "without"4272 * a cgroup (on the root cgroup, sys wide, etc).4273 *4274 * Multiple cgroups:4275 *4276 * trace -G A -e sched:*switch -G B4277 *4278 * the syscall ones go to the 'A' cgroup, the sched:sched_switch goes4279 * to the 'B' cgroup.4280 *4281 * evlist__set_default_cgroup() grabs a reference of the passed cgroup4282 * only for the evsels still without a cgroup, i.e. evsel->cgroup == NULL.4283 */4284 if (trace->cgroup)4285 evlist__set_default_cgroup(trace->evlist, trace->cgroup);4286 4287 err = evlist__create_maps(evlist, &trace->opts.target);4288 if (err < 0) {4289 fprintf(trace->output, "Problems parsing the target to trace, check your options!\n");4290 goto out_delete_evlist;4291 }4292 4293 err = trace__symbols_init(trace, evlist);4294 if (err < 0) {4295 fprintf(trace->output, "Problems initializing symbol libraries!\n");4296 goto out_delete_evlist;4297 }4298 4299 evlist__config(evlist, &trace->opts, &callchain_param);4300 4301 if (forks) {4302 err = evlist__prepare_workload(evlist, &trace->opts.target, argv, false, NULL);4303 if (err < 0) {4304 fprintf(trace->output, "Couldn't run the workload!\n");4305 goto out_delete_evlist;4306 }4307 workload_pid = evlist->workload.pid;4308 }4309 4310 err = evlist__open(evlist);4311 if (err < 0)4312 goto out_error_open;4313#ifdef HAVE_BPF_SKEL4314 if (trace->syscalls.events.bpf_output) {4315 struct perf_cpu cpu;4316 4317 /*4318 * Set up the __augmented_syscalls__ BPF map to hold for each4319 * CPU the bpf-output event's file descriptor.4320 */4321 perf_cpu_map__for_each_cpu(cpu, i, trace->syscalls.events.bpf_output->core.cpus) {4322 bpf_map__update_elem(trace->skel->maps.__augmented_syscalls__,4323 &cpu.cpu, sizeof(int),4324 xyarray__entry(trace->syscalls.events.bpf_output->core.fd,4325 cpu.cpu, 0),4326 sizeof(__u32), BPF_ANY);4327 }4328 }4329#endif4330 err = trace__set_filter_pids(trace);4331 if (err < 0)4332 goto out_error_mem;4333 4334#ifdef HAVE_BPF_SKEL4335 if (trace->skel && trace->skel->progs.sys_enter)4336 trace__init_syscalls_bpf_prog_array_maps(trace);4337#endif4338 4339 if (trace->ev_qualifier_ids.nr > 0) {4340 err = trace__set_ev_qualifier_filter(trace);4341 if (err < 0)4342 goto out_errno;4343 4344 if (trace->syscalls.events.sys_exit) {4345 pr_debug("event qualifier tracepoint filter: %s\n",4346 trace->syscalls.events.sys_exit->filter);4347 }4348 }4349 4350 /*4351 * If the "close" syscall is not traced, then we will not have the4352 * opportunity to, in syscall_arg__scnprintf_close_fd() invalidate the4353 * fd->pathname table and were ending up showing the last value set by4354 * syscalls opening a pathname and associating it with a descriptor or4355 * reading it from /proc/pid/fd/ in cases where that doesn't make4356 * sense.4357 *4358 * So just disable this beautifier (SCA_FD, SCA_FDAT) when 'close' is4359 * not in use.4360 */4361 trace->fd_path_disabled = !trace__syscall_enabled(trace, syscalltbl__id(trace->sctbl, "close"));4362 4363 err = trace__expand_filters(trace, &evsel);4364 if (err)4365 goto out_delete_evlist;4366 err = evlist__apply_filters(evlist, &evsel, &trace->opts.target);4367 if (err < 0)4368 goto out_error_apply_filters;4369 4370 err = evlist__mmap(evlist, trace->opts.mmap_pages);4371 if (err < 0)4372 goto out_error_mmap;4373 4374 if (!target__none(&trace->opts.target) && !trace->opts.target.initial_delay)4375 evlist__enable(evlist);4376 4377 if (forks)4378 evlist__start_workload(evlist);4379 4380 if (trace->opts.target.initial_delay) {4381 usleep(trace->opts.target.initial_delay * 1000);4382 evlist__enable(evlist);4383 }4384 4385 trace->multiple_threads = perf_thread_map__pid(evlist->core.threads, 0) == -1 ||4386 perf_thread_map__nr(evlist->core.threads) > 1 ||4387 evlist__first(evlist)->core.attr.inherit;4388 4389 /*4390 * Now that we already used evsel->core.attr to ask the kernel to setup the4391 * events, lets reuse evsel->core.attr.sample_max_stack as the limit in4392 * trace__resolve_callchain(), allowing per-event max-stack settings4393 * to override an explicitly set --max-stack global setting.4394 */4395 evlist__for_each_entry(evlist, evsel) {4396 if (evsel__has_callchain(evsel) &&4397 evsel->core.attr.sample_max_stack == 0)4398 evsel->core.attr.sample_max_stack = trace->max_stack;4399 }4400again:4401 before = trace->nr_events;4402 4403 for (i = 0; i < evlist->core.nr_mmaps; i++) {4404 union perf_event *event;4405 struct mmap *md;4406 4407 md = &evlist->mmap[i];4408 if (perf_mmap__read_init(&md->core) < 0)4409 continue;4410 4411 while ((event = perf_mmap__read_event(&md->core)) != NULL) {4412 ++trace->nr_events;4413 4414 err = trace__deliver_event(trace, event);4415 if (err)4416 goto out_disable;4417 4418 perf_mmap__consume(&md->core);4419 4420 if (interrupted)4421 goto out_disable;4422 4423 if (done && !draining) {4424 evlist__disable(evlist);4425 draining = true;4426 }4427 }4428 perf_mmap__read_done(&md->core);4429 }4430 4431 if (trace->nr_events == before) {4432 int timeout = done ? 100 : -1;4433 4434 if (!draining && evlist__poll(evlist, timeout) > 0) {4435 if (evlist__filter_pollfd(evlist, POLLERR | POLLHUP | POLLNVAL) == 0)4436 draining = true;4437 4438 goto again;4439 } else {4440 if (trace__flush_events(trace))4441 goto out_disable;4442 }4443 } else {4444 goto again;4445 }4446 4447out_disable:4448 thread__zput(trace->current);4449 4450 evlist__disable(evlist);4451 4452 if (trace->sort_events)4453 ordered_events__flush(&trace->oe.data, OE_FLUSH__FINAL);4454 4455 if (!err) {4456 if (trace->summary)4457 trace__fprintf_thread_summary(trace, trace->output);4458 4459 if (trace->show_tool_stats) {4460 fprintf(trace->output, "Stats:\n "4461 " vfs_getname : %" PRIu64 "\n"4462 " proc_getname: %" PRIu64 "\n",4463 trace->stats.vfs_getname,4464 trace->stats.proc_getname);4465 }4466 }4467 4468out_delete_evlist:4469 trace__symbols__exit(trace);4470 evlist__free_syscall_tp_fields(evlist);4471 evlist__delete(evlist);4472 cgroup__put(trace->cgroup);4473 trace->evlist = NULL;4474 trace->live = false;4475 return err;4476{4477 char errbuf[BUFSIZ];4478 4479out_error_sched_stat_runtime:4480 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "sched", "sched_stat_runtime");4481 goto out_error;4482 4483out_error_raw_syscalls:4484 tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "raw_syscalls", "sys_(enter|exit)");4485 goto out_error;4486 4487out_error_mmap:4488 evlist__strerror_mmap(evlist, errno, errbuf, sizeof(errbuf));4489 goto out_error;4490 4491out_error_open:4492 evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));4493 4494out_error:4495 fprintf(trace->output, "%s\n", errbuf);4496 goto out_delete_evlist;4497 4498out_error_apply_filters:4499 fprintf(trace->output,4500 "Failed to set filter \"%s\" on event %s with %d (%s)\n",4501 evsel->filter, evsel__name(evsel), errno,4502 str_error_r(errno, errbuf, sizeof(errbuf)));4503 goto out_delete_evlist;4504}4505out_error_mem:4506 fprintf(trace->output, "Not enough memory to run!\n");4507 goto out_delete_evlist;4508 4509out_errno:4510 fprintf(trace->output, "errno=%d,%s\n", errno, strerror(errno));4511 goto out_delete_evlist;4512}4513 4514static int trace__replay(struct trace *trace)4515{4516 const struct evsel_str_handler handlers[] = {4517 { "probe:vfs_getname", trace__vfs_getname, },4518 };4519 struct perf_data data = {4520 .path = input_name,4521 .mode = PERF_DATA_MODE_READ,4522 .force = trace->force,4523 };4524 struct perf_session *session;4525 struct evsel *evsel;4526 int err = -1;4527 4528 trace->tool.sample = trace__process_sample;4529 trace->tool.mmap = perf_event__process_mmap;4530 trace->tool.mmap2 = perf_event__process_mmap2;4531 trace->tool.comm = perf_event__process_comm;4532 trace->tool.exit = perf_event__process_exit;4533 trace->tool.fork = perf_event__process_fork;4534 trace->tool.attr = perf_event__process_attr;4535 trace->tool.tracing_data = perf_event__process_tracing_data;4536 trace->tool.build_id = perf_event__process_build_id;4537 trace->tool.namespaces = perf_event__process_namespaces;4538 4539 trace->tool.ordered_events = true;4540 trace->tool.ordering_requires_timestamps = true;4541 4542 /* add tid to output */4543 trace->multiple_threads = true;4544 4545 session = perf_session__new(&data, &trace->tool);4546 if (IS_ERR(session))4547 return PTR_ERR(session);4548 4549 if (trace->opts.target.pid)4550 symbol_conf.pid_list_str = strdup(trace->opts.target.pid);4551 4552 if (trace->opts.target.tid)4553 symbol_conf.tid_list_str = strdup(trace->opts.target.tid);4554 4555 if (symbol__init(&session->header.env) < 0)4556 goto out;4557 4558 trace->host = &session->machines.host;4559 4560 err = perf_session__set_tracepoints_handlers(session, handlers);4561 if (err)4562 goto out;4563 4564 evsel = evlist__find_tracepoint_by_name(session->evlist, "raw_syscalls:sys_enter");4565 trace->syscalls.events.sys_enter = evsel;4566 /* older kernels have syscalls tp versus raw_syscalls */4567 if (evsel == NULL)4568 evsel = evlist__find_tracepoint_by_name(session->evlist, "syscalls:sys_enter");4569 4570 if (evsel &&4571 (evsel__init_raw_syscall_tp(evsel, trace__sys_enter) < 0 ||4572 perf_evsel__init_sc_tp_ptr_field(evsel, args))) {4573 pr_err("Error during initialize raw_syscalls:sys_enter event\n");4574 goto out;4575 }4576 4577 evsel = evlist__find_tracepoint_by_name(session->evlist, "raw_syscalls:sys_exit");4578 trace->syscalls.events.sys_exit = evsel;4579 if (evsel == NULL)4580 evsel = evlist__find_tracepoint_by_name(session->evlist, "syscalls:sys_exit");4581 if (evsel &&4582 (evsel__init_raw_syscall_tp(evsel, trace__sys_exit) < 0 ||4583 perf_evsel__init_sc_tp_uint_field(evsel, ret))) {4584 pr_err("Error during initialize raw_syscalls:sys_exit event\n");4585 goto out;4586 }4587 4588 evlist__for_each_entry(session->evlist, evsel) {4589 if (evsel->core.attr.type == PERF_TYPE_SOFTWARE &&4590 (evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ||4591 evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||4592 evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS))4593 evsel->handler = trace__pgfault;4594 }4595 4596 setup_pager();4597 4598 err = perf_session__process_events(session);4599 if (err)4600 pr_err("Failed to process events, error %d", err);4601 4602 else if (trace->summary)4603 trace__fprintf_thread_summary(trace, trace->output);4604 4605out:4606 perf_session__delete(session);4607 4608 return err;4609}4610 4611static size_t trace__fprintf_threads_header(FILE *fp)4612{4613 size_t printed;4614 4615 printed = fprintf(fp, "\n Summary of events:\n\n");4616 4617 return printed;4618}4619 4620DEFINE_RESORT_RB(syscall_stats, a->msecs > b->msecs,4621 struct syscall_stats *stats;4622 double msecs;4623 int syscall;4624)4625{4626 struct int_node *source = rb_entry(nd, struct int_node, rb_node);4627 struct syscall_stats *stats = source->priv;4628 4629 entry->syscall = source->i;4630 entry->stats = stats;4631 entry->msecs = stats ? (u64)stats->stats.n * (avg_stats(&stats->stats) / NSEC_PER_MSEC) : 0;4632}4633 4634static size_t thread__dump_stats(struct thread_trace *ttrace,4635 struct trace *trace, FILE *fp)4636{4637 size_t printed = 0;4638 struct syscall *sc;4639 struct rb_node *nd;4640 DECLARE_RESORT_RB_INTLIST(syscall_stats, ttrace->syscall_stats);4641 4642 if (syscall_stats == NULL)4643 return 0;4644 4645 printed += fprintf(fp, "\n");4646 4647 printed += fprintf(fp, " syscall calls errors total min avg max stddev\n");4648 printed += fprintf(fp, " (msec) (msec) (msec) (msec) (%%)\n");4649 printed += fprintf(fp, " --------------- -------- ------ -------- --------- --------- --------- ------\n");4650 4651 resort_rb__for_each_entry(nd, syscall_stats) {4652 struct syscall_stats *stats = syscall_stats_entry->stats;4653 if (stats) {4654 double min = (double)(stats->stats.min) / NSEC_PER_MSEC;4655 double max = (double)(stats->stats.max) / NSEC_PER_MSEC;4656 double avg = avg_stats(&stats->stats);4657 double pct;4658 u64 n = (u64)stats->stats.n;4659 4660 pct = avg ? 100.0 * stddev_stats(&stats->stats) / avg : 0.0;4661 avg /= NSEC_PER_MSEC;4662 4663 sc = &trace->syscalls.table[syscall_stats_entry->syscall];4664 printed += fprintf(fp, " %-15s", sc->name);4665 printed += fprintf(fp, " %8" PRIu64 " %6" PRIu64 " %9.3f %9.3f %9.3f",4666 n, stats->nr_failures, syscall_stats_entry->msecs, min, avg);4667 printed += fprintf(fp, " %9.3f %9.2f%%\n", max, pct);4668 4669 if (trace->errno_summary && stats->nr_failures) {4670 int e;4671 4672 for (e = 0; e < stats->max_errno; ++e) {4673 if (stats->errnos[e] != 0)4674 fprintf(fp, "\t\t\t\t%s: %d\n", perf_env__arch_strerrno(trace->host->env, e + 1), stats->errnos[e]);4675 }4676 }4677 }4678 }4679 4680 resort_rb__delete(syscall_stats);4681 printed += fprintf(fp, "\n\n");4682 4683 return printed;4684}4685 4686static size_t trace__fprintf_thread(FILE *fp, struct thread *thread, struct trace *trace)4687{4688 size_t printed = 0;4689 struct thread_trace *ttrace = thread__priv(thread);4690 double ratio;4691 4692 if (ttrace == NULL)4693 return 0;4694 4695 ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;4696 4697 printed += fprintf(fp, " %s (%d), ", thread__comm_str(thread), thread__tid(thread));4698 printed += fprintf(fp, "%lu events, ", ttrace->nr_events);4699 printed += fprintf(fp, "%.1f%%", ratio);4700 if (ttrace->pfmaj)4701 printed += fprintf(fp, ", %lu majfaults", ttrace->pfmaj);4702 if (ttrace->pfmin)4703 printed += fprintf(fp, ", %lu minfaults", ttrace->pfmin);4704 if (trace->sched)4705 printed += fprintf(fp, ", %.3f msec\n", ttrace->runtime_ms);4706 else if (fputc('\n', fp) != EOF)4707 ++printed;4708 4709 printed += thread__dump_stats(ttrace, trace, fp);4710 4711 return printed;4712}4713 4714static unsigned long thread__nr_events(struct thread_trace *ttrace)4715{4716 return ttrace ? ttrace->nr_events : 0;4717}4718 4719static int trace_nr_events_cmp(void *priv __maybe_unused,4720 const struct list_head *la,4721 const struct list_head *lb)4722{4723 struct thread_list *a = list_entry(la, struct thread_list, list);4724 struct thread_list *b = list_entry(lb, struct thread_list, list);4725 unsigned long a_nr_events = thread__nr_events(thread__priv(a->thread));4726 unsigned long b_nr_events = thread__nr_events(thread__priv(b->thread));4727 4728 if (a_nr_events != b_nr_events)4729 return a_nr_events < b_nr_events ? -1 : 1;4730 4731 /* Identical number of threads, place smaller tids first. */4732 return thread__tid(a->thread) < thread__tid(b->thread)4733 ? -14734 : (thread__tid(a->thread) > thread__tid(b->thread) ? 1 : 0);4735}4736 4737static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)4738{4739 size_t printed = trace__fprintf_threads_header(fp);4740 LIST_HEAD(threads);4741 4742 if (machine__thread_list(trace->host, &threads) == 0) {4743 struct thread_list *pos;4744 4745 list_sort(NULL, &threads, trace_nr_events_cmp);4746 4747 list_for_each_entry(pos, &threads, list)4748 printed += trace__fprintf_thread(fp, pos->thread, trace);4749 }4750 thread_list__delete(&threads);4751 return printed;4752}4753 4754static int trace__set_duration(const struct option *opt, const char *str,4755 int unset __maybe_unused)4756{4757 struct trace *trace = opt->value;4758 4759 trace->duration_filter = atof(str);4760 return 0;4761}4762 4763static int trace__set_filter_pids_from_option(const struct option *opt, const char *str,4764 int unset __maybe_unused)4765{4766 int ret = -1;4767 size_t i;4768 struct trace *trace = opt->value;4769 /*4770 * FIXME: introduce a intarray class, plain parse csv and create a4771 * { int nr, int entries[] } struct...4772 */4773 struct intlist *list = intlist__new(str);4774 4775 if (list == NULL)4776 return -1;4777 4778 i = trace->filter_pids.nr = intlist__nr_entries(list) + 1;4779 trace->filter_pids.entries = calloc(i, sizeof(pid_t));4780 4781 if (trace->filter_pids.entries == NULL)4782 goto out;4783 4784 trace->filter_pids.entries[0] = getpid();4785 4786 for (i = 1; i < trace->filter_pids.nr; ++i)4787 trace->filter_pids.entries[i] = intlist__entry(list, i - 1)->i;4788 4789 intlist__delete(list);4790 ret = 0;4791out:4792 return ret;4793}4794 4795static int trace__open_output(struct trace *trace, const char *filename)4796{4797 struct stat st;4798 4799 if (!stat(filename, &st) && st.st_size) {4800 char oldname[PATH_MAX];4801 4802 scnprintf(oldname, sizeof(oldname), "%s.old", filename);4803 unlink(oldname);4804 rename(filename, oldname);4805 }4806 4807 trace->output = fopen(filename, "w");4808 4809 return trace->output == NULL ? -errno : 0;4810}4811 4812static int parse_pagefaults(const struct option *opt, const char *str,4813 int unset __maybe_unused)4814{4815 int *trace_pgfaults = opt->value;4816 4817 if (strcmp(str, "all") == 0)4818 *trace_pgfaults |= TRACE_PFMAJ | TRACE_PFMIN;4819 else if (strcmp(str, "maj") == 0)4820 *trace_pgfaults |= TRACE_PFMAJ;4821 else if (strcmp(str, "min") == 0)4822 *trace_pgfaults |= TRACE_PFMIN;4823 else4824 return -1;4825 4826 return 0;4827}4828 4829static void evlist__set_default_evsel_handler(struct evlist *evlist, void *handler)4830{4831 struct evsel *evsel;4832 4833 evlist__for_each_entry(evlist, evsel) {4834 if (evsel->handler == NULL)4835 evsel->handler = handler;4836 }4837}4838 4839static void evsel__set_syscall_arg_fmt(struct evsel *evsel, const char *name)4840{4841 struct syscall_arg_fmt *fmt = evsel__syscall_arg_fmt(evsel);4842 4843 if (fmt) {4844 const struct syscall_fmt *scfmt = syscall_fmt__find(name);4845 4846 if (scfmt) {4847 int skip = 0;4848 4849 if (strcmp(evsel->tp_format->format.fields->name, "__syscall_nr") == 0 ||4850 strcmp(evsel->tp_format->format.fields->name, "nr") == 0)4851 ++skip;4852 4853 memcpy(fmt + skip, scfmt->arg, (evsel->tp_format->format.nr_fields - skip) * sizeof(*fmt));4854 }4855 }4856}4857 4858static int evlist__set_syscall_tp_fields(struct evlist *evlist, bool *use_btf)4859{4860 struct evsel *evsel;4861 4862 evlist__for_each_entry(evlist, evsel) {4863 if (evsel->priv || !evsel->tp_format)4864 continue;4865 4866 if (strcmp(evsel->tp_format->system, "syscalls")) {4867 evsel__init_tp_arg_scnprintf(evsel, use_btf);4868 continue;4869 }4870 4871 if (evsel__init_syscall_tp(evsel))4872 return -1;4873 4874 if (!strncmp(evsel->tp_format->name, "sys_enter_", 10)) {4875 struct syscall_tp *sc = __evsel__syscall_tp(evsel);4876 4877 if (__tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64)))4878 return -1;4879 4880 evsel__set_syscall_arg_fmt(evsel, evsel->tp_format->name + sizeof("sys_enter_") - 1);4881 } else if (!strncmp(evsel->tp_format->name, "sys_exit_", 9)) {4882 struct syscall_tp *sc = __evsel__syscall_tp(evsel);4883 4884 if (__tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap))4885 return -1;4886 4887 evsel__set_syscall_arg_fmt(evsel, evsel->tp_format->name + sizeof("sys_exit_") - 1);4888 }4889 }4890 4891 return 0;4892}4893 4894/*4895 * XXX: Hackish, just splitting the combined -e+--event (syscalls4896 * (raw_syscalls:{sys_{enter,exit}} + events (tracepoints, HW, SW, etc) to use4897 * existing facilities unchanged (trace->ev_qualifier + parse_options()).4898 *4899 * It'd be better to introduce a parse_options() variant that would return a4900 * list with the terms it didn't match to an event...4901 */4902static int trace__parse_events_option(const struct option *opt, const char *str,4903 int unset __maybe_unused)4904{4905 struct trace *trace = (struct trace *)opt->value;4906 const char *s = str;4907 char *sep = NULL, *lists[2] = { NULL, NULL, };4908 int len = strlen(str) + 1, err = -1, list, idx;4909 char *strace_groups_dir = system_path(STRACE_GROUPS_DIR);4910 char group_name[PATH_MAX];4911 const struct syscall_fmt *fmt;4912 4913 if (strace_groups_dir == NULL)4914 return -1;4915 4916 if (*s == '!') {4917 ++s;4918 trace->not_ev_qualifier = true;4919 }4920 4921 while (1) {4922 if ((sep = strchr(s, ',')) != NULL)4923 *sep = '\0';4924 4925 list = 0;4926 if (syscalltbl__id(trace->sctbl, s) >= 0 ||4927 syscalltbl__strglobmatch_first(trace->sctbl, s, &idx) >= 0) {4928 list = 1;4929 goto do_concat;4930 }4931 4932 fmt = syscall_fmt__find_by_alias(s);4933 if (fmt != NULL) {4934 list = 1;4935 s = fmt->name;4936 } else {4937 path__join(group_name, sizeof(group_name), strace_groups_dir, s);4938 if (access(group_name, R_OK) == 0)4939 list = 1;4940 }4941do_concat:4942 if (lists[list]) {4943 sprintf(lists[list] + strlen(lists[list]), ",%s", s);4944 } else {4945 lists[list] = malloc(len);4946 if (lists[list] == NULL)4947 goto out;4948 strcpy(lists[list], s);4949 }4950 4951 if (!sep)4952 break;4953 4954 *sep = ',';4955 s = sep + 1;4956 }4957 4958 if (lists[1] != NULL) {4959 struct strlist_config slist_config = {4960 .dirname = strace_groups_dir,4961 };4962 4963 trace->ev_qualifier = strlist__new(lists[1], &slist_config);4964 if (trace->ev_qualifier == NULL) {4965 fputs("Not enough memory to parse event qualifier", trace->output);4966 goto out;4967 }4968 4969 if (trace__validate_ev_qualifier(trace))4970 goto out;4971 trace->trace_syscalls = true;4972 }4973 4974 err = 0;4975 4976 if (lists[0]) {4977 struct parse_events_option_args parse_events_option_args = {4978 .evlistp = &trace->evlist,4979 };4980 struct option o = {4981 .value = &parse_events_option_args,4982 };4983 err = parse_events_option(&o, lists[0], 0);4984 }4985out:4986 free(strace_groups_dir);4987 free(lists[0]);4988 free(lists[1]);4989 if (sep)4990 *sep = ',';4991 4992 return err;4993}4994 4995static int trace__parse_cgroups(const struct option *opt, const char *str, int unset)4996{4997 struct trace *trace = opt->value;4998 4999 if (!list_empty(&trace->evlist->core.entries)) {5000 struct option o = {5001 .value = &trace->evlist,5002 };5003 return parse_cgroups(&o, str, unset);5004 }5005 trace->cgroup = evlist__findnew_cgroup(trace->evlist, str);5006 5007 return 0;5008}5009 5010static int trace__config(const char *var, const char *value, void *arg)5011{5012 struct trace *trace = arg;5013 int err = 0;5014 5015 if (!strcmp(var, "trace.add_events")) {5016 trace->perfconfig_events = strdup(value);5017 if (trace->perfconfig_events == NULL) {5018 pr_err("Not enough memory for %s\n", "trace.add_events");5019 return -1;5020 }5021 } else if (!strcmp(var, "trace.show_timestamp")) {5022 trace->show_tstamp = perf_config_bool(var, value);5023 } else if (!strcmp(var, "trace.show_duration")) {5024 trace->show_duration = perf_config_bool(var, value);5025 } else if (!strcmp(var, "trace.show_arg_names")) {5026 trace->show_arg_names = perf_config_bool(var, value);5027 if (!trace->show_arg_names)5028 trace->show_zeros = true;5029 } else if (!strcmp(var, "trace.show_zeros")) {5030 bool new_show_zeros = perf_config_bool(var, value);5031 if (!trace->show_arg_names && !new_show_zeros) {5032 pr_warning("trace.show_zeros has to be set when trace.show_arg_names=no\n");5033 goto out;5034 }5035 trace->show_zeros = new_show_zeros;5036 } else if (!strcmp(var, "trace.show_prefix")) {5037 trace->show_string_prefix = perf_config_bool(var, value);5038 } else if (!strcmp(var, "trace.no_inherit")) {5039 trace->opts.no_inherit = perf_config_bool(var, value);5040 } else if (!strcmp(var, "trace.args_alignment")) {5041 int args_alignment = 0;5042 if (perf_config_int(&args_alignment, var, value) == 0)5043 trace->args_alignment = args_alignment;5044 } else if (!strcmp(var, "trace.tracepoint_beautifiers")) {5045 if (strcasecmp(value, "libtraceevent") == 0)5046 trace->libtraceevent_print = true;5047 else if (strcasecmp(value, "libbeauty") == 0)5048 trace->libtraceevent_print = false;5049 }5050out:5051 return err;5052}5053 5054static void trace__exit(struct trace *trace)5055{5056 int i;5057 5058 strlist__delete(trace->ev_qualifier);5059 zfree(&trace->ev_qualifier_ids.entries);5060 if (trace->syscalls.table) {5061 for (i = 0; i <= trace->sctbl->syscalls.max_id; i++)5062 syscall__exit(&trace->syscalls.table[i]);5063 zfree(&trace->syscalls.table);5064 }5065 syscalltbl__delete(trace->sctbl);5066 zfree(&trace->perfconfig_events);5067}5068 5069#ifdef HAVE_BPF_SKEL5070static int bpf__setup_bpf_output(struct evlist *evlist)5071{5072 int err = parse_event(evlist, "bpf-output/no-inherit=1,name=__augmented_syscalls__/");5073 5074 if (err)5075 pr_debug("ERROR: failed to create the \"__augmented_syscalls__\" bpf-output event\n");5076 5077 return err;5078}5079#endif5080 5081int cmd_trace(int argc, const char **argv)5082{5083 const char *trace_usage[] = {5084 "perf trace [<options>] [<command>]",5085 "perf trace [<options>] -- <command> [<options>]",5086 "perf trace record [<options>] [<command>]",5087 "perf trace record [<options>] -- <command> [<options>]",5088 NULL5089 };5090 struct trace trace = {5091 .opts = {5092 .target = {5093 .uid = UINT_MAX,5094 .uses_mmap = true,5095 },5096 .user_freq = UINT_MAX,5097 .user_interval = ULLONG_MAX,5098 .no_buffering = true,5099 .mmap_pages = UINT_MAX,5100 },5101 .output = stderr,5102 .show_comm = true,5103 .show_tstamp = true,5104 .show_duration = true,5105 .show_arg_names = true,5106 .args_alignment = 70,5107 .trace_syscalls = false,5108 .kernel_syscallchains = false,5109 .max_stack = UINT_MAX,5110 .max_events = ULONG_MAX,5111 };5112 const char *output_name = NULL;5113 const struct option trace_options[] = {5114 OPT_CALLBACK('e', "event", &trace, "event",5115 "event/syscall selector. use 'perf list' to list available events",5116 trace__parse_events_option),5117 OPT_CALLBACK(0, "filter", &trace.evlist, "filter",5118 "event filter", parse_filter),5119 OPT_BOOLEAN(0, "comm", &trace.show_comm,5120 "show the thread COMM next to its id"),5121 OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),5122 OPT_CALLBACK(0, "expr", &trace, "expr", "list of syscalls/events to trace",5123 trace__parse_events_option),5124 OPT_STRING('o', "output", &output_name, "file", "output file name"),5125 OPT_STRING('i', "input", &input_name, "file", "Analyze events in file"),5126 OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",5127 "trace events on existing process id"),5128 OPT_STRING('t', "tid", &trace.opts.target.tid, "tid",5129 "trace events on existing thread id"),5130 OPT_CALLBACK(0, "filter-pids", &trace, "CSV list of pids",5131 "pids to filter (by the kernel)", trace__set_filter_pids_from_option),5132 OPT_BOOLEAN('a', "all-cpus", &trace.opts.target.system_wide,5133 "system-wide collection from all CPUs"),5134 OPT_STRING('C', "cpu", &trace.opts.target.cpu_list, "cpu",5135 "list of cpus to monitor"),5136 OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,5137 "child tasks do not inherit counters"),5138 OPT_CALLBACK('m', "mmap-pages", &trace.opts.mmap_pages, "pages",5139 "number of mmap data pages", evlist__parse_mmap_pages),5140 OPT_STRING('u', "uid", &trace.opts.target.uid_str, "user",5141 "user to profile"),5142 OPT_CALLBACK(0, "duration", &trace, "float",5143 "show only events with duration > N.M ms",5144 trace__set_duration),5145 OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),5146 OPT_INCR('v', "verbose", &verbose, "be more verbose"),5147 OPT_BOOLEAN('T', "time", &trace.full_time,5148 "Show full timestamp, not time relative to first start"),5149 OPT_BOOLEAN(0, "failure", &trace.failure_only,5150 "Show only syscalls that failed"),5151 OPT_BOOLEAN('s', "summary", &trace.summary_only,5152 "Show only syscall summary with statistics"),5153 OPT_BOOLEAN('S', "with-summary", &trace.summary,5154 "Show all syscalls and summary with statistics"),5155 OPT_BOOLEAN(0, "errno-summary", &trace.errno_summary,5156 "Show errno stats per syscall, use with -s or -S"),5157 OPT_CALLBACK_DEFAULT('F', "pf", &trace.trace_pgfaults, "all|maj|min",5158 "Trace pagefaults", parse_pagefaults, "maj"),5159 OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"),5160 OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"),5161 OPT_CALLBACK(0, "call-graph", &trace.opts,5162 "record_mode[,record_size]", record_callchain_help,5163 &record_parse_callchain_opt),5164 OPT_BOOLEAN(0, "libtraceevent_print", &trace.libtraceevent_print,5165 "Use libtraceevent to print the tracepoint arguments."),5166 OPT_BOOLEAN(0, "kernel-syscall-graph", &trace.kernel_syscallchains,5167 "Show the kernel callchains on the syscall exit path"),5168 OPT_ULONG(0, "max-events", &trace.max_events,5169 "Set the maximum number of events to print, exit after that is reached. "),5170 OPT_UINTEGER(0, "min-stack", &trace.min_stack,5171 "Set the minimum stack depth when parsing the callchain, "5172 "anything below the specified depth will be ignored."),5173 OPT_UINTEGER(0, "max-stack", &trace.max_stack,5174 "Set the maximum stack depth when parsing the callchain, "5175 "anything beyond the specified depth will be ignored. "5176 "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),5177 OPT_BOOLEAN(0, "sort-events", &trace.sort_events,5178 "Sort batch of events before processing, use if getting out of order events"),5179 OPT_BOOLEAN(0, "print-sample", &trace.print_sample,5180 "print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),5181 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,5182 "per thread proc mmap processing timeout in ms"),5183 OPT_CALLBACK('G', "cgroup", &trace, "name", "monitor event in cgroup name only",5184 trace__parse_cgroups),5185 OPT_INTEGER('D', "delay", &trace.opts.target.initial_delay,5186 "ms to wait before starting measurement after program "5187 "start"),5188 OPT_BOOLEAN(0, "force-btf", &trace.force_btf, "Prefer btf_dump general pretty printer"5189 "to customized ones"),5190 OPTS_EVSWITCH(&trace.evswitch),5191 OPT_END()5192 };5193 bool __maybe_unused max_stack_user_set = true;5194 bool mmap_pages_user_set = true;5195 struct evsel *evsel;5196 const char * const trace_subcommands[] = { "record", NULL };5197 int err = -1;5198 char bf[BUFSIZ];5199 struct sigaction sigchld_act;5200 5201 signal(SIGSEGV, sighandler_dump_stack);5202 signal(SIGFPE, sighandler_dump_stack);5203 signal(SIGINT, sighandler_interrupt);5204 5205 memset(&sigchld_act, 0, sizeof(sigchld_act));5206 sigchld_act.sa_flags = SA_SIGINFO;5207 sigchld_act.sa_sigaction = sighandler_chld;5208 sigaction(SIGCHLD, &sigchld_act, NULL);5209 5210 trace.evlist = evlist__new();5211 trace.sctbl = syscalltbl__new();5212 5213 if (trace.evlist == NULL || trace.sctbl == NULL) {5214 pr_err("Not enough memory to run!\n");5215 err = -ENOMEM;5216 goto out;5217 }5218 5219 /*5220 * Parsing .perfconfig may entail creating a BPF event, that may need5221 * to create BPF maps, so bump RLIM_MEMLOCK as the default 64K setting5222 * is too small. This affects just this process, not touching the5223 * global setting. If it fails we'll get something in 'perf trace -v'5224 * to help diagnose the problem.5225 */5226 rlimit__bump_memlock();5227 5228 err = perf_config(trace__config, &trace);5229 if (err)5230 goto out;5231 5232 argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,5233 trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);5234 5235 /*5236 * Here we already passed thru trace__parse_events_option() and it has5237 * already figured out if -e syscall_name, if not but if --event5238 * foo:bar was used, the user is interested _just_ in those, say,5239 * tracepoint events, not in the strace-like syscall-name-based mode.5240 *5241 * This is important because we need to check if strace-like mode is5242 * needed to decided if we should filter out the eBPF5243 * __augmented_syscalls__ code, if it is in the mix, say, via5244 * .perfconfig trace.add_events, and filter those out.5245 */5246 if (!trace.trace_syscalls && !trace.trace_pgfaults &&5247 trace.evlist->core.nr_entries == 0 /* Was --events used? */) {5248 trace.trace_syscalls = true;5249 }5250 /*5251 * Now that we have --verbose figured out, lets see if we need to parse5252 * events from .perfconfig, so that if those events fail parsing, say some5253 * BPF program fails, then we'll be able to use --verbose to see what went5254 * wrong in more detail.5255 */5256 if (trace.perfconfig_events != NULL) {5257 struct parse_events_error parse_err;5258 5259 parse_events_error__init(&parse_err);5260 err = parse_events(trace.evlist, trace.perfconfig_events, &parse_err);5261 if (err)5262 parse_events_error__print(&parse_err, trace.perfconfig_events);5263 parse_events_error__exit(&parse_err);5264 if (err)5265 goto out;5266 }5267 5268 if ((nr_cgroups || trace.cgroup) && !trace.opts.target.system_wide) {5269 usage_with_options_msg(trace_usage, trace_options,5270 "cgroup monitoring only available in system-wide mode");5271 }5272 5273#ifdef HAVE_BPF_SKEL5274 if (!trace.trace_syscalls)5275 goto skip_augmentation;5276 5277 if ((argc >= 1) && (strcmp(argv[0], "record") == 0)) {5278 pr_debug("Syscall augmentation fails with record, disabling augmentation");5279 goto skip_augmentation;5280 }5281 5282 trace.skel = augmented_raw_syscalls_bpf__open();5283 if (!trace.skel) {5284 pr_debug("Failed to open augmented syscalls BPF skeleton");5285 } else {5286 /*5287 * Disable attaching the BPF programs except for sys_enter and5288 * sys_exit that tail call into this as necessary.5289 */5290 struct bpf_program *prog;5291 5292 bpf_object__for_each_program(prog, trace.skel->obj) {5293 if (prog != trace.skel->progs.sys_enter && prog != trace.skel->progs.sys_exit)5294 bpf_program__set_autoattach(prog, /*autoattach=*/false);5295 }5296 5297 err = augmented_raw_syscalls_bpf__load(trace.skel);5298 5299 if (err < 0) {5300 libbpf_strerror(err, bf, sizeof(bf));5301 pr_debug("Failed to load augmented syscalls BPF skeleton: %s\n", bf);5302 } else {5303 augmented_raw_syscalls_bpf__attach(trace.skel);5304 trace__add_syscall_newtp(&trace);5305 }5306 }5307 5308 err = bpf__setup_bpf_output(trace.evlist);5309 if (err) {5310 libbpf_strerror(err, bf, sizeof(bf));5311 pr_err("ERROR: Setup BPF output event failed: %s\n", bf);5312 goto out;5313 }5314 trace.syscalls.events.bpf_output = evlist__last(trace.evlist);5315 assert(evsel__name_is(trace.syscalls.events.bpf_output, "__augmented_syscalls__"));5316skip_augmentation:5317#endif5318 err = -1;5319 5320 if (trace.trace_pgfaults) {5321 trace.opts.sample_address = true;5322 trace.opts.sample_time = true;5323 }5324 5325 if (trace.opts.mmap_pages == UINT_MAX)5326 mmap_pages_user_set = false;5327 5328 if (trace.max_stack == UINT_MAX) {5329 trace.max_stack = input_name ? PERF_MAX_STACK_DEPTH : sysctl__max_stack();5330 max_stack_user_set = false;5331 }5332 5333#ifdef HAVE_DWARF_UNWIND_SUPPORT5334 if ((trace.min_stack || max_stack_user_set) && !callchain_param.enabled) {5335 record_opts__parse_callchain(&trace.opts, &callchain_param, "dwarf", false);5336 }5337#endif5338 5339 if (callchain_param.enabled) {5340 if (!mmap_pages_user_set && geteuid() == 0)5341 trace.opts.mmap_pages = perf_event_mlock_kb_in_pages() * 4;5342 5343 symbol_conf.use_callchain = true;5344 }5345 5346 if (trace.evlist->core.nr_entries > 0) {5347 bool use_btf = false;5348 5349 evlist__set_default_evsel_handler(trace.evlist, trace__event_handler);5350 if (evlist__set_syscall_tp_fields(trace.evlist, &use_btf)) {5351 perror("failed to set syscalls:* tracepoint fields");5352 goto out;5353 }5354 5355 if (use_btf)5356 trace__load_vmlinux_btf(&trace);5357 }5358 5359 if (trace.sort_events) {5360 ordered_events__init(&trace.oe.data, ordered_events__deliver_event, &trace);5361 ordered_events__set_copy_on_queue(&trace.oe.data, true);5362 }5363 5364 /*5365 * If we are augmenting syscalls, then combine what we put in the5366 * __augmented_syscalls__ BPF map with what is in the5367 * syscalls:sys_exit_FOO tracepoints, i.e. just like we do without BPF,5368 * combining raw_syscalls:sys_enter with raw_syscalls:sys_exit.5369 *5370 * We'll switch to look at two BPF maps, one for sys_enter and the5371 * other for sys_exit when we start augmenting the sys_exit paths with5372 * buffers that are being copied from kernel to userspace, think 'read'5373 * syscall.5374 */5375 if (trace.syscalls.events.bpf_output) {5376 evlist__for_each_entry(trace.evlist, evsel) {5377 bool raw_syscalls_sys_exit = evsel__name_is(evsel, "raw_syscalls:sys_exit");5378 5379 if (raw_syscalls_sys_exit) {5380 trace.raw_augmented_syscalls = true;5381 goto init_augmented_syscall_tp;5382 }5383 5384 if (trace.syscalls.events.bpf_output->priv == NULL &&5385 strstr(evsel__name(evsel), "syscalls:sys_enter")) {5386 struct evsel *augmented = trace.syscalls.events.bpf_output;5387 if (evsel__init_augmented_syscall_tp(augmented, evsel) ||5388 evsel__init_augmented_syscall_tp_args(augmented))5389 goto out;5390 /*5391 * Augmented is __augmented_syscalls__ BPF_OUTPUT event5392 * Above we made sure we can get from the payload the tp fields5393 * that we get from syscalls:sys_enter tracefs format file.5394 */5395 augmented->handler = trace__sys_enter;5396 /*5397 * Now we do the same for the *syscalls:sys_enter event so that5398 * if we handle it directly, i.e. if the BPF prog returns 0 so5399 * as not to filter it, then we'll handle it just like we would5400 * for the BPF_OUTPUT one:5401 */5402 if (evsel__init_augmented_syscall_tp(evsel, evsel) ||5403 evsel__init_augmented_syscall_tp_args(evsel))5404 goto out;5405 evsel->handler = trace__sys_enter;5406 }5407 5408 if (strstarts(evsel__name(evsel), "syscalls:sys_exit_")) {5409 struct syscall_tp *sc;5410init_augmented_syscall_tp:5411 if (evsel__init_augmented_syscall_tp(evsel, evsel))5412 goto out;5413 sc = __evsel__syscall_tp(evsel);5414 /*5415 * For now with BPF raw_augmented we hook into5416 * raw_syscalls:sys_enter and there we get all5417 * 6 syscall args plus the tracepoint common5418 * fields and the syscall_nr (another long).5419 * So we check if that is the case and if so5420 * don't look after the sc->args_size but5421 * always after the full raw_syscalls:sys_enter5422 * payload, which is fixed.5423 *5424 * We'll revisit this later to pass5425 * s->args_size to the BPF augmenter (now5426 * tools/perf/examples/bpf/augmented_raw_syscalls.c,5427 * so that it copies only what we need for each5428 * syscall, like what happens when we use5429 * syscalls:sys_enter_NAME, so that we reduce5430 * the kernel/userspace traffic to just what is5431 * needed for each syscall.5432 */5433 if (trace.raw_augmented_syscalls)5434 trace.raw_augmented_syscalls_args_size = (6 + 1) * sizeof(long) + sc->id.offset;5435 evsel__init_augmented_syscall_tp_ret(evsel);5436 evsel->handler = trace__sys_exit;5437 }5438 }5439 }5440 5441 if ((argc >= 1) && (strcmp(argv[0], "record") == 0))5442 return trace__record(&trace, argc-1, &argv[1]);5443 5444 /* Using just --errno-summary will trigger --summary */5445 if (trace.errno_summary && !trace.summary && !trace.summary_only)5446 trace.summary_only = true;5447 5448 /* summary_only implies summary option, but don't overwrite summary if set */5449 if (trace.summary_only)5450 trace.summary = trace.summary_only;5451 5452 if (output_name != NULL) {5453 err = trace__open_output(&trace, output_name);5454 if (err < 0) {5455 perror("failed to create output file");5456 goto out;5457 }5458 }5459 5460 err = evswitch__init(&trace.evswitch, trace.evlist, stderr);5461 if (err)5462 goto out_close;5463 5464 err = target__validate(&trace.opts.target);5465 if (err) {5466 target__strerror(&trace.opts.target, err, bf, sizeof(bf));5467 fprintf(trace.output, "%s", bf);5468 goto out_close;5469 }5470 5471 err = target__parse_uid(&trace.opts.target);5472 if (err) {5473 target__strerror(&trace.opts.target, err, bf, sizeof(bf));5474 fprintf(trace.output, "%s", bf);5475 goto out_close;5476 }5477 5478 if (!argc && target__none(&trace.opts.target))5479 trace.opts.target.system_wide = true;5480 5481 if (input_name)5482 err = trace__replay(&trace);5483 else5484 err = trace__run(&trace, argc, argv);5485 5486out_close:5487 if (output_name != NULL)5488 fclose(trace.output);5489out:5490 trace__exit(&trace);5491#ifdef HAVE_BPF_SKEL5492 augmented_raw_syscalls_bpf__destroy(trace.skel);5493#endif5494 return err;5495}5496