/*
* builtin-trace.c
*
* Builtin 'trace' command:
*
* Display a continuously updated trace of any workload, CPU, specific PID,
* system wide, etc. Default format is loosely strace like, but any other
* event may be specified using --event.
*
* Copyright (C) 2012, 2013, 2014, 2015 Red Hat Inc, Arnaldo Carvalho de Melo <[email protected]>
*
* Initially based on the 'trace' prototype by Thomas Gleixner:
*
* http://lwn.net/Articles/415728/ ("Announcing a new utility: 'trace'")
*/
#include "util/record.h"
#include <api/fs/tracing_path.h>
#ifdef HAVE_LIBBPF_SUPPORT
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#include <bpf/btf.h>
#ifdef HAVE_BPF_SKEL
#include "bpf_skel/augmented_raw_syscalls.skel.h"
#endif
#endif
#include "util/bpf_map.h"
#include "util/rlimit.h"
#include "builtin.h"
#include "util/cgroup.h"
#include "util/color.h"
#include "util/config.h"
#include "util/debug.h"
#include "util/dso.h"
#include "util/env.h"
#include "util/event.h"
#include "util/evsel.h"
#include "util/evsel_fprintf.h"
#include "util/synthetic-events.h"
#include "util/evlist.h"
#include "util/evswitch.h"
#include "util/mmap.h"
#include <subcmd/pager.h>
#include <subcmd/exec-cmd.h>
#include "util/machine.h"
#include "util/map.h"
#include "util/symbol.h"
#include "util/path.h"
#include "util/session.h"
#include "util/thread.h"
#include <subcmd/parse-options.h>
#include "util/strlist.h"
#include "util/intlist.h"
#include "util/thread_map.h"
#include "util/stat.h"
#include "util/tool.h"
#include "util/util.h"
#include "trace/beauty/beauty.h"
#include "trace-event.h"
#include "util/parse-events.h"
#include "util/tracepoint.h"
#include "callchain.h"
#include "print_binary.h"
#include "string2.h"
#include "syscalltbl.h"
#include "rb_resort.h"
#include "../perf.h"
#include "trace_augment.h"
#include <errno.h>
#include <inttypes.h>
#include <poll.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <linux/err.h>
#include <linux/filter.h>
#include <linux/kernel.h>
#include <linux/list_sort.h>
#include <linux/random.h>
#include <linux/stringify.h>
#include <linux/time64.h>
#include <linux/zalloc.h>
#include <fcntl.h>
#include <sys/sysmacros.h>
#include <linux/ctype.h>
#include <perf/mmap.h>
#ifdef HAVE_LIBTRACEEVENT
#include <traceevent/event-parse.h>
#endif
#ifndef O_CLOEXEC
# define O_CLOEXEC 02000000
#endif
#ifndef F_LINUX_SPECIFIC_BASE
# define F_LINUX_SPECIFIC_BASE 1024
#endif
#define RAW_SYSCALL_ARGS_NUM 6
/*
* strtoul: Go from a string to a value, i.e. for msr: MSR_FS_BASE to 0xc0000100
*
* We have to explicitely mark the direction of the flow of data, if from the
* kernel to user space or the other way around, since the BPF collector we
* have so far copies only from user to kernel space, mark the arguments that
* go that direction, so that we don´t end up collecting the previous contents
* for syscall args that goes from kernel to user space.
*/
struct syscall_arg_fmt {
size_t (*scnprintf)(char *bf, size_t size, struct syscall_arg *arg);
bool (*strtoul)(char *bf, size_t size, struct syscall_arg *arg, u64 *val);
unsigned long (*mask_val)(struct syscall_arg *arg, unsigned long val);
void *parm;
const char *name;
u16 nr_entries; // for arrays
bool from_user;
bool show_zero;
#ifdef HAVE_LIBBPF_SUPPORT
const struct btf_type *type;
int type_id; /* used in btf_dump */
#endif
};
struct syscall_fmt {
const char *name;
const char *alias;
struct {
const char *sys_enter,
*sys_exit;
} bpf_prog_name;
struct syscall_arg_fmt arg[RAW_SYSCALL_ARGS_NUM];
u8 nr_args;
bool errpid;
bool timeout;
bool hexret;
};
struct trace {
struct perf_tool tool;
struct syscalltbl *sctbl;
struct {
struct syscall *table;
struct {
struct evsel *sys_enter,
*sys_exit,
*bpf_output;
} events;
} syscalls;
#ifdef HAVE_BPF_SKEL
struct augmented_raw_syscalls_bpf *skel;
#endif
#ifdef HAVE_LIBBPF_SUPPORT
struct btf *btf;
#endif
struct record_opts opts;
struct evlist *evlist;
struct machine *host;
struct thread *current;
struct cgroup *cgroup;
u64 base_time;
FILE *output;
unsigned long nr_events;
unsigned long nr_events_printed;
unsigned long max_events;
struct evswitch evswitch;
struct strlist *ev_qualifier;
struct {
size_t nr;
int *entries;
} ev_qualifier_ids;
struct {
size_t nr;
pid_t *entries;
struct bpf_map *map;
} filter_pids;
double duration_filter;
double runtime_ms;
struct {
u64 vfs_getname,
proc_getname;
} stats;
unsigned int max_stack;
unsigned int min_stack;
int raw_augmented_syscalls_args_size;
bool raw_augmented_syscalls;
bool fd_path_disabled;
bool sort_events;
bool not_ev_qualifier;
bool live;
bool full_time;
bool sched;
bool multiple_threads;
bool summary;
bool summary_only;
bool errno_summary;
bool failure_only;
bool show_comm;
bool print_sample;
bool show_tool_stats;
bool trace_syscalls;
bool libtraceevent_print;
bool kernel_syscallchains;
s16 args_alignment;
bool show_tstamp;
bool show_duration;
bool show_zeros;
bool show_arg_names;
bool show_string_prefix;
bool force;
bool vfs_getname;
bool force_btf;
int trace_pgfaults;
char *perfconfig_events;
struct {
struct ordered_events data;
u64 last;
} oe;
};
static void trace__load_vmlinux_btf(struct trace *trace __maybe_unused)
{
#ifdef HAVE_LIBBPF_SUPPORT
if (trace->btf != NULL)
return;
trace->btf = btf__load_vmlinux_btf();
if (verbose > 0) {
fprintf(trace->output, trace->btf ? "vmlinux BTF loaded\n" :
"Failed to load vmlinux BTF\n");
}
#endif
}
struct tp_field {
int offset;
union {
u64 (*integer)(struct tp_field *field, struct perf_sample *sample);
void *(*pointer)(struct tp_field *field, struct perf_sample *sample);
};
};
#define TP_UINT_FIELD(bits) \
static u64 tp_field__u##bits(struct tp_field *field, struct perf_sample *sample) \
{ \
u##bits value; \
memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
return value; \
}
TP_UINT_FIELD(8);
TP_UINT_FIELD(16);
TP_UINT_FIELD(32);
TP_UINT_FIELD(64);
#define TP_UINT_FIELD__SWAPPED(bits) \
static u64 tp_field__swapped_u##bits(struct tp_field *field, struct perf_sample *sample) \
{ \
u##bits value; \
memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
return bswap_##bits(value);\
}
TP_UINT_FIELD__SWAPPED(16);
TP_UINT_FIELD__SWAPPED(32);
TP_UINT_FIELD__SWAPPED(64);
static int __tp_field__init_uint(struct tp_field *field, int size, int offset, bool needs_swap)
{
field->offset = offset;
switch (size) {
case 1:
field->integer = tp_field__u8;
break;
case 2:
field->integer = needs_swap ? tp_field__swapped_u16 : tp_field__u16;
break;
case 4:
field->integer = needs_swap ? tp_field__swapped_u32 : tp_field__u32;
break;
case 8:
field->integer = needs_swap ? tp_field__swapped_u64 : tp_field__u64;
break;
default:
return -1;
}
return 0;
}
static int tp_field__init_uint(struct tp_field *field, struct tep_format_field *format_field, bool needs_swap)
{
return __tp_field__init_uint(field, format_field->size, format_field->offset, needs_swap);
}
static void *tp_field__ptr(struct tp_field *field, struct perf_sample *sample)
{
return sample->raw_data + field->offset;
}
static int __tp_field__init_ptr(struct tp_field *field, int offset)
{
field->offset = offset;
field->pointer = tp_field__ptr;
return 0;
}
static int tp_field__init_ptr(struct tp_field *field, struct tep_format_field *format_field)
{
return __tp_field__init_ptr(field, format_field->offset);
}
struct syscall_tp {
struct tp_field id;
union {
struct tp_field args, ret;
};
};
/*
* The evsel->priv as used by 'perf trace'
* sc: for raw_syscalls:sys_{enter,exit} and syscalls:sys_{enter,exit}_SYSCALLNAME
* fmt: for all the other tracepoints
*/
struct evsel_trace {
struct syscall_tp sc;
struct syscall_arg_fmt *fmt;
};
static struct evsel_trace *evsel_trace__new(void)
{
return zalloc(sizeof(struct evsel_trace));
}
static void evsel_trace__delete(struct evsel_trace *et)
{
if (et == NULL)
return;
zfree(&et->fmt);
free(et);
}
/*
* Used with raw_syscalls:sys_{enter,exit} and with the
* syscalls:sys_{enter,exit}_SYSCALL tracepoints
*/
static inline struct syscall_tp *__evsel__syscall_tp(struct evsel *evsel)
{
struct evsel_trace *et = evsel->priv;
return &et->sc;
}
static struct syscall_tp *evsel__syscall_tp(struct evsel *evsel)
{
if (evsel->priv == NULL) {
evsel->priv = evsel_trace__new();
if (evsel->priv == NULL)
return NULL;
}
return __evsel__syscall_tp(evsel);
}
/*
* Used with all the other tracepoints.
*/
static inline struct syscall_arg_fmt *__evsel__syscall_arg_fmt(struct evsel *evsel)
{
struct evsel_trace *et = evsel->priv;
return et->fmt;
}
static struct syscall_arg_fmt *evsel__syscall_arg_fmt(struct evsel *evsel)
{
struct evsel_trace *et = evsel->priv;
if (evsel->priv == NULL) {
et = evsel->priv = evsel_trace__new();
if (et == NULL)
return NULL;
}
if (et->fmt == NULL) {
et->fmt = calloc(evsel->tp_format->format.nr_fields, sizeof(struct syscall_arg_fmt));
if (et->fmt == NULL)
goto out_delete;
}
return __evsel__syscall_arg_fmt(evsel);
out_delete:
evsel_trace__delete(evsel->priv);
evsel->priv = NULL;
return NULL;
}
static int evsel__init_tp_uint_field(struct evsel *evsel, struct tp_field *field, const char *name)
{
struct tep_format_field *format_field = evsel__field(evsel, name);
if (format_field == NULL)
return -1;
return tp_field__init_uint(field, format_field, evsel->needs_swap);
}
#define perf_evsel__init_sc_tp_uint_field(evsel, name) \
({ struct syscall_tp *sc = __evsel__syscall_tp(evsel);\
evsel__init_tp_uint_field(evsel, &sc->name, #name); })
static int evsel__init_tp_ptr_field(struct evsel *evsel, struct tp_field *field, const char *name)
{
struct tep_format_field *format_field = evsel__field(evsel, name);
if (format_field == NULL)
return -1;
return tp_field__init_ptr(field, format_field);
}
#define perf_evsel__init_sc_tp_ptr_field(evsel, name) \
({ struct syscall_tp *sc = __evsel__syscall_tp(evsel);\
evsel__init_tp_ptr_field(evsel, &sc->name, #name); })
static void evsel__delete_priv(struct evsel *evsel)
{
zfree(&evsel->priv);
evsel__delete(evsel);
}
static int evsel__init_syscall_tp(struct evsel *evsel)
{
struct syscall_tp *sc = evsel__syscall_tp(evsel);
if (sc != NULL) {
if (evsel__init_tp_uint_field(evsel, &sc->id, "__syscall_nr") &&
evsel__init_tp_uint_field(evsel, &sc->id, "nr"))
return -ENOENT;
return 0;
}
return -ENOMEM;
}
static int evsel__init_augmented_syscall_tp(struct evsel *evsel, struct evsel *tp)
{
struct syscall_tp *sc = evsel__syscall_tp(evsel);
if (sc != NULL) {
struct tep_format_field *syscall_id = evsel__field(tp, "id");
if (syscall_id == NULL)
syscall_id = evsel__field(tp, "__syscall_nr");
if (syscall_id == NULL ||
__tp_field__init_uint(&sc->id, syscall_id->size, syscall_id->offset, evsel->needs_swap))
return -EINVAL;
return 0;
}
return -ENOMEM;
}
static int evsel__init_augmented_syscall_tp_args(struct evsel *evsel)
{
struct syscall_tp *sc = __evsel__syscall_tp(evsel);
return __tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64));
}
static int evsel__init_augmented_syscall_tp_ret(struct evsel *evsel)
{
struct syscall_tp *sc = __evsel__syscall_tp(evsel);
return __tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap);
}
static int evsel__init_raw_syscall_tp(struct evsel *evsel, void *handler)
{
if (evsel__syscall_tp(evsel) != NULL) {
if (perf_evsel__init_sc_tp_uint_field(evsel, id))
return -ENOENT;
evsel->handler = handler;
return 0;
}
return -ENOMEM;
}
static struct evsel *perf_evsel__raw_syscall_newtp(const char *direction, void *handler)
{
struct evsel *evsel = evsel__newtp("raw_syscalls", direction);
/* older kernel (e.g., RHEL6) use syscalls:{enter,exit} */
if (IS_ERR(evsel))
evsel = evsel__newtp("syscalls", direction);
if (IS_ERR(evsel))
return NULL;
if (evsel__init_raw_syscall_tp(evsel, handler))
goto out_delete;
return evsel;
out_delete:
evsel__delete_priv(evsel);
return NULL;
}
#define perf_evsel__sc_tp_uint(evsel, name, sample) \
({ struct syscall_tp *fields = __evsel__syscall_tp(evsel); \
fields->name.integer(&fields->name, sample); })
#define perf_evsel__sc_tp_ptr(evsel, name, sample) \
({ struct syscall_tp *fields = __evsel__syscall_tp(evsel); \
fields->name.pointer(&fields->name, sample); })
size_t strarray__scnprintf_suffix(struct strarray *sa, char *bf, size_t size, const char *intfmt, bool show_suffix, int val)
{
int idx = val - sa->offset;
if (idx < 0 || idx >= sa->nr_entries || sa->entries[idx] == NULL) {
size_t printed = scnprintf(bf, size, intfmt, val);
if (show_suffix)
printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sa->prefix);
return printed;
}
return scnprintf(bf, size, "%s%s", sa->entries[idx], show_suffix ? sa->prefix : "");
}
size_t strarray__scnprintf(struct strarray *sa, char *bf, size_t size, const char *intfmt, bool show_prefix, int val)
{
int idx = val - sa->offset;
if (idx < 0 || idx >= sa->nr_entries || sa->entries[idx] == NULL) {
size_t printed = scnprintf(bf, size, intfmt, val);
if (show_prefix)
printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sa->prefix);
return printed;
}
return scnprintf(bf, size, "%s%s", show_prefix ? sa->prefix : "", sa->entries[idx]);
}
static size_t __syscall_arg__scnprintf_strarray(char *bf, size_t size,
const char *intfmt,
struct syscall_arg *arg)
{
return strarray__scnprintf(arg->parm, bf, size, intfmt, arg->show_string_prefix, arg->val);
}
static size_t syscall_arg__scnprintf_strarray(char *bf, size_t size,
struct syscall_arg *arg)
{
return __syscall_arg__scnprintf_strarray(bf, size, "%d", arg);
}
#define SCA_STRARRAY syscall_arg__scnprintf_strarray
bool syscall_arg__strtoul_strarray(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)
{
return strarray__strtoul(arg->parm, bf, size, ret);
}
bool syscall_arg__strtoul_strarray_flags(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)
{
return strarray__strtoul_flags(arg->parm, bf, size, ret);
}
bool syscall_arg__strtoul_strarrays(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)
{
return strarrays__strtoul(arg->parm, bf, size, ret);
}
size_t syscall_arg__scnprintf_strarray_flags(char *bf, size_t size, struct syscall_arg *arg)
{
return strarray__scnprintf_flags(arg->parm, bf, size, arg->show_string_prefix, arg->val);
}
size_t strarrays__scnprintf(struct strarrays *sas, char *bf, size_t size, const char *intfmt, bool show_prefix, int val)
{
size_t printed;
int i;
for (i = 0; i < sas->nr_entries; ++i) {
struct strarray *sa = sas->entries[i];
int idx = val - sa->offset;
if (idx >= 0 && idx < sa->nr_entries) {
if (sa->entries[idx] == NULL)
break;
return scnprintf(bf, size, "%s%s", show_prefix ? sa->prefix : "", sa->entries[idx]);
}
}
printed = scnprintf(bf, size, intfmt, val);
if (show_prefix)
printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sas->entries[0]->prefix);
return printed;
}
bool strarray__strtoul(struct strarray *sa, char *bf, size_t size, u64 *ret)
{
int i;
for (i = 0; i < sa->nr_entries; ++i) {
if (sa->entries[i] && strncmp(sa->entries[i], bf, size) == 0 && sa->entries[i][size] == '\0') {
*ret = sa->offset + i;
return true;
}
}
return false;
}
bool strarray__strtoul_flags(struct strarray *sa, char *bf, size_t size, u64 *ret)
{
u64 val = 0;
char *tok = bf, *sep, *end;
*ret = 0;
while (size != 0) {
int toklen = size;
sep = memchr(tok, '|', size);
if (sep != NULL) {
size -= sep - tok + 1;
end = sep - 1;
while (end > tok && isspace(*end))
--end;
toklen = end - tok + 1;
}
while (isspace(*tok))
++tok;
if (isalpha(*tok) || *tok == '_') {
if (!strarray__strtoul(sa, tok, toklen, &val))
return false;
} else
val = strtoul(tok, NULL, 0);
*ret |= (1 << (val - 1));
if (sep == NULL)
break;
tok = sep + 1;
}
return true;
}
bool strarrays__strtoul(struct strarrays *sas, char *bf, size_t size, u64 *ret)
{
int i;
for (i = 0; i < sas->nr_entries; ++i) {
struct strarray *sa = sas->entries[i];
if (strarray__strtoul(sa, bf, size, ret))
return true;
}
return false;
}
size_t syscall_arg__scnprintf_strarrays(char *bf, size_t size,
struct syscall_arg *arg)
{
return strarrays__scnprintf(arg->parm, bf, size, "%d", arg->show_string_prefix, arg->val);
}
#ifndef AT_FDCWD
#define AT_FDCWD -100
#endif
static size_t syscall_arg__scnprintf_fd_at(char *bf, size_t size,
struct syscall_arg *arg)
{
int fd = arg->val;
const char *prefix = "AT_FD";
if (fd == AT_FDCWD)
return scnprintf(bf, size, "%s%s", arg->show_string_prefix ? prefix : "", "CWD");
return syscall_arg__scnprintf_fd(bf, size, arg);
}
#define SCA_FDAT syscall_arg__scnprintf_fd_at
static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
struct syscall_arg *arg);
#define SCA_CLOSE_FD syscall_arg__scnprintf_close_fd
size_t syscall_arg__scnprintf_hex(char *bf, size_t size, struct syscall_arg *arg)
{
return scnprintf(bf, size, "%#lx", arg->val);
}
size_t syscall_arg__scnprintf_ptr(char *bf, size_t size, struct syscall_arg *arg)
{
if (arg->val == 0)
return scnprintf(bf, size, "NULL");
return syscall_arg__scnprintf_hex(bf, size, arg);
}
size_t syscall_arg__scnprintf_int(char *bf, size_t size, struct syscall_arg *arg)
{
return scnprintf(bf, size, "%d", arg->val);
}
size_t syscall_arg__scnprintf_long(char *bf, size_t size, struct syscall_arg *arg)
{
return scnprintf(bf, size, "%ld", arg->val);
}
static size_t syscall_arg__scnprintf_char_array(char *bf, size_t size, struct syscall_arg *arg)
{
// XXX Hey, maybe for sched:sched_switch prev/next comm fields we can
// fill missing comms using thread__set_comm()...
// here or in a special syscall_arg__scnprintf_pid_sched_tp...
return scnprintf(bf, size, "\"%-.*s\"", arg->fmt->nr_entries ?: arg->len, arg->val);
}
#define SCA_CHAR_ARRAY syscall_arg__scnprintf_char_array
static const char *bpf_cmd[] = {
"MAP_CREATE", "MAP_LOOKUP_ELEM", "MAP_UPDATE_ELEM", "MAP_DELETE_ELEM",
"MAP_GET_NEXT_KEY", "PROG_LOAD", "OBJ_PIN", "OBJ_GET", "PROG_ATTACH",
"PROG_DETACH", "PROG_TEST_RUN", "PROG_GET_NEXT_ID", "MAP_GET_NEXT_ID",
"PROG_GET_FD_BY_ID", "MAP_GET_FD_BY_ID", "OBJ_GET_INFO_BY_FD",
"PROG_QUERY", "RAW_TRACEPOINT_OPEN", "BTF_LOAD", "BTF_GET_FD_BY_ID",
"TASK_FD_QUERY", "MAP_LOOKUP_AND_DELETE_ELEM", "MAP_FREEZE",
"BTF_GET_NEXT_ID", "MAP_LOOKUP_BATCH", "MAP_LOOKUP_AND_DELETE_BATCH",
"MAP_UPDATE_BATCH", "MAP_DELETE_BATCH", "LINK_CREATE", "LINK_UPDATE",
"LINK_GET_FD_BY_ID", "LINK_GET_NEXT_ID", "ENABLE_STATS", "ITER_CREATE",
"LINK_DETACH", "PROG_BIND_MAP",
};
static DEFINE_STRARRAY(bpf_cmd, "BPF_");
static const char *fsmount_flags[] = {
[1] = "CLOEXEC",
};
static DEFINE_STRARRAY(fsmount_flags, "FSMOUNT_");
#include "trace/beauty/generated/fsconfig_arrays.c"
static DEFINE_STRARRAY(fsconfig_cmds, "FSCONFIG_");
static const char *epoll_ctl_ops[] = { "ADD", "DEL", "MOD", };
static DEFINE_STRARRAY_OFFSET(epoll_ctl_ops, "EPOLL_CTL_", 1);
static const char *itimers[] = { "REAL", "VIRTUAL", "PROF", };
static DEFINE_STRARRAY(itimers, "ITIMER_");
static const char *keyctl_options[] = {
"GET_KEYRING_ID", "JOIN_SESSION_KEYRING", "UPDATE", "REVOKE", "CHOWN",
"SETPERM", "DESCRIBE", "CLEAR", "LINK", "UNLINK", "SEARCH", "READ",
"INSTANTIATE", "NEGATE", "SET_REQKEY_KEYRING", "SET_TIMEOUT",
"ASSUME_AUTHORITY", "GET_SECURITY", "SESSION_TO_PARENT", "REJECT",
"INSTANTIATE_IOV", "INVALIDATE", "GET_PERSISTENT",
};
static DEFINE_STRARRAY(keyctl_options, "KEYCTL_");
static const char *whences[] = { "SET", "CUR", "END",
#ifdef SEEK_DATA
"DATA",
#endif
#ifdef SEEK_HOLE
"HOLE",
#endif
};
static DEFINE_STRARRAY(whences, "SEEK_");
static const char *fcntl_cmds[] = {
"DUPFD", "GETFD", "SETFD", "GETFL", "SETFL", "GETLK", "SETLK",
"SETLKW", "SETOWN", "GETOWN", "SETSIG", "GETSIG", "GETLK64",
"SETLK64", "SETLKW64", "SETOWN_EX", "GETOWN_EX",
"GETOWNER_UIDS",
};
static DEFINE_STRARRAY(fcntl_cmds, "F_");
static const char *fcntl_linux_specific_cmds[] = {
"SETLEASE", "GETLEASE", "NOTIFY", "DUPFD_QUERY", [5] = "CANCELLK", "DUPFD_CLOEXEC",
"SETPIPE_SZ", "GETPIPE_SZ", "ADD_SEALS", "GET_SEALS",
"GET_RW_HINT", "SET_RW_HINT", "GET_FILE_RW_HINT", "SET_FILE_RW_HINT",
};
static DEFINE_STRARRAY_OFFSET(fcntl_linux_specific_cmds, "F_", F_LINUX_SPECIFIC_BASE);
static struct strarray *fcntl_cmds_arrays[] = {
&strarray__fcntl_cmds,
&strarray__fcntl_linux_specific_cmds,
};
static DEFINE_STRARRAYS(fcntl_cmds_arrays);
static const char *rlimit_resources[] = {
"CPU", "FSIZE", "DATA", "STACK", "CORE", "RSS", "NPROC", "NOFILE",
"MEMLOCK", "AS", "LOCKS", "SIGPENDING", "MSGQUEUE", "NICE", "RTPRIO",
"RTTIME",
};
static DEFINE_STRARRAY(rlimit_resources, "RLIMIT_");
static const char *sighow[] = { "BLOCK", "UNBLOCK", "SETMASK", };
static DEFINE_STRARRAY(sighow, "SIG_");
static const char *clockid[] = {
"REALTIME", "MONOTONIC", "PROCESS_CPUTIME_ID", "THREAD_CPUTIME_ID",
"MONOTONIC_RAW", "REALTIME_COARSE", "MONOTONIC_COARSE", "BOOTTIME",
"REALTIME_ALARM", "BOOTTIME_ALARM", "SGI_CYCLE", "TAI"
};
static DEFINE_STRARRAY(clockid, "CLOCK_");
static size_t syscall_arg__scnprintf_access_mode(char *bf, size_t size,
struct syscall_arg *arg)
{
bool show_prefix = arg->show_string_prefix;
const char *suffix = "_OK";
size_t printed = 0;
int mode = arg->val;
if (mode == F_OK) /* 0 */
return scnprintf(bf, size, "F%s", show_prefix ? suffix : "");
#define P_MODE(n) \
if (mode & n##_OK) { \
printed += scnprintf(bf + printed, size - printed, "%s%s", #n, show_prefix ? suffix : ""); \
mode &= ~n##_OK; \
}
P_MODE(R);
P_MODE(W);
P_MODE(X);
#undef P_MODE
if (mode)
printed += scnprintf(bf + printed, size - printed, "|%#x", mode);
return printed;
}
#define SCA_ACCMODE syscall_arg__scnprintf_access_mode
static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,
struct syscall_arg *arg);
#define SCA_FILENAME syscall_arg__scnprintf_filename
// 'argname' is just documentational at this point, to remove the previous comment with that info
#define SCA_FILENAME_FROM_USER(argname) \
{ .scnprintf = SCA_FILENAME, \
.from_user = true, }
static size_t syscall_arg__scnprintf_buf(char *bf, size_t size, struct syscall_arg *arg);
#define SCA_BUF syscall_arg__scnprintf_buf
static size_t syscall_arg__scnprintf_pipe_flags(char *bf, size_t size,
struct syscall_arg *arg)
{
bool show_prefix = arg->show_string_prefix;
const char *prefix = "O_";
int printed = 0, flags = arg->val;
#define P_FLAG(n) \
if (flags & O_##n) { \
printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
flags &= ~O_##n; \
}
P_FLAG(CLOEXEC);
P_FLAG(NONBLOCK);
#undef P_FLAG
if (flags)
printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
return printed;
}
#define SCA_PIPE_FLAGS syscall_arg__scnprintf_pipe_flags
#ifndef GRND_NONBLOCK
#define GRND_NONBLOCK 0x0001
#endif
#ifndef GRND_RANDOM
#define GRND_RANDOM 0x0002
#endif
static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,
struct syscall_arg *arg)
{
bool show_prefix = arg->show_string_prefix;
const char *prefix = "GRND_";
int printed = 0, flags = arg->val;
#define P_FLAG(n) \
if (flags & GRND_##n) { \
printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
flags &= ~GRND_##n; \
}
P_FLAG(RANDOM);
P_FLAG(NONBLOCK);
#undef P_FLAG
if (flags)
printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
return printed;
}
#define SCA_GETRANDOM_FLAGS syscall_arg__scnprintf_getrandom_flags
#ifdef HAVE_LIBBPF_SUPPORT
static void syscall_arg_fmt__cache_btf_enum(struct syscall_arg_fmt *arg_fmt, struct btf *btf, char *type)
{
int id;
type = strstr(type, "enum ");
if (type == NULL)
return;
type += 5; // skip "enum " to get the enumeration name
id = btf__find_by_name(btf, type);
if (id < 0)
return;
arg_fmt->type = btf__type_by_id(btf, id);
}
static bool syscall_arg__strtoul_btf_enum(char *bf, size_t size, struct syscall_arg *arg, u64 *val)
{
const struct btf_type *bt = arg->fmt->type;
struct btf *btf = arg->trace->btf;
struct btf_enum *be = btf_enum(bt);
for (int i = 0; i < btf_vlen(bt); ++i, ++be) {
const char *name = btf__name_by_offset(btf, be->name_off);
int max_len = max(size, strlen(name));
if (strncmp(name, bf, max_len) == 0) {
*val = be->val;
return true;
}
}
return false;
}
static bool syscall_arg__strtoul_btf_type(char *bf, size_t size, struct syscall_arg *arg, u64 *val)
{
const struct btf_type *bt;
char *type = arg->type_name;
struct btf *btf;
trace__load_vmlinux_btf(arg->trace);
btf = arg->trace->btf;
if (btf == NULL)
return false;
if (arg->fmt->type == NULL) {
// See if this is an enum
syscall_arg_fmt__cache_btf_enum(arg->fmt, btf, type);
}
// Now let's see if we have a BTF type resolved
bt = arg->fmt->type;
if (bt == NULL)
return false;
// If it is an enum:
if (btf_is_enum(arg->fmt->type))
return syscall_arg__strtoul_btf_enum(bf, size, arg, val);
return false;
}
static size_t btf_enum_scnprintf(const struct btf_type *type, struct btf *btf, char *bf, size_t size, int val)
{
struct btf_enum *be = btf_enum(type);
const int nr_entries = btf_vlen(type);
for (int i = 0; i < nr_entries; ++i, ++be) {
if (be->val == val) {
return scnprintf(bf, size, "%s",
btf__name_by_offset(btf, be->name_off));
}
}
return 0;
}
struct trace_btf_dump_snprintf_ctx {
char *bf;
size_t printed, size;
};
static void trace__btf_dump_snprintf(void *vctx, const char *fmt, va_list args)
{
struct trace_btf_dump_snprintf_ctx *ctx = vctx;
ctx->printed += vscnprintf(ctx->bf + ctx->printed, ctx->size - ctx->printed, fmt, args);
}
static size_t btf_struct_scnprintf(const struct btf_type *type, struct btf *btf, char *bf, size_t size, struct syscall_arg *arg)
{
struct trace_btf_dump_snprintf_ctx ctx = {
.bf = bf,
.size = size,
};
struct augmented_arg *augmented_arg = arg->augmented.args;
int type_id = arg->fmt->type_id, consumed;
struct btf_dump *btf_dump;
LIBBPF_OPTS(btf_dump_opts, dump_opts);
LIBBPF_OPTS(btf_dump_type_data_opts, dump_data_opts);
if (arg == NULL || arg->augmented.args == NULL)
return 0;
dump_data_opts.compact = true;
dump_data_opts.skip_names = !arg->trace->show_arg_names;
btf_dump = btf_dump__new(btf, trace__btf_dump_snprintf, &ctx, &dump_opts);
if (btf_dump == NULL)
return 0;
/* pretty print the struct data here */
if (btf_dump__dump_type_data(btf_dump, type_id, arg->augmented.args->value, type->size, &dump_data_opts) == 0)
return 0;
consumed = sizeof(*augmented_arg) + augmented_arg->size;
arg->augmented.args = ((void *)arg->augmented.args) + consumed;
arg->augmented.size -= consumed;
btf_dump__free(btf_dump);
return ctx.printed;
}
static size_t trace__btf_scnprintf(struct trace *trace, struct syscall_arg *arg, char *bf,
size_t size, int val, char *type)
{
struct syscall_arg_fmt *arg_fmt = arg->fmt;
if (trace->btf == NULL)
return 0;
if (arg_fmt->type == NULL) {
// Check if this is an enum and if we have the BTF type for it.
syscall_arg_fmt__cache_btf_enum(arg_fmt, trace->btf, type);
}
// Did we manage to find a BTF type for the syscall/tracepoint argument?
if (arg_fmt->type == NULL)
return 0;
if (btf_is_enum(arg_fmt->type))
return btf_enum_scnprintf(arg_fmt->type, trace->btf, bf, size, val);
else if (btf_is_struct(arg_fmt->type) || btf_is_union(arg_fmt->type))
return btf_struct_scnprintf(arg_fmt->type, trace->btf, bf, size, arg);
return 0;
}
#else // HAVE_LIBBPF_SUPPORT
static size_t trace__btf_scnprintf(struct trace *trace __maybe_unused, struct syscall_arg *arg __maybe_unused,
char *bf __maybe_unused, size_t size __maybe_unused, int val __maybe_unused,
char *type __maybe_unused)
{
return 0;
}
static bool syscall_arg__strtoul_btf_type(char *bf __maybe_unused, size_t size __maybe_unused,
struct syscall_arg *arg __maybe_unused, u64 *val __maybe_unused)
{
return false;
}
#endif // HAVE_LIBBPF_SUPPORT
#define STUL_BTF_TYPE syscall_arg__strtoul_btf_type
#define STRARRAY(name, array) \
{ .scnprintf = SCA_STRARRAY, \
.strtoul = STUL_STRARRAY, \
.parm = &strarray__##array, }
#define STRARRAY_FLAGS(name, array) \
{ .scnprintf = SCA_STRARRAY_FLAGS, \
.strtoul = STUL_STRARRAY_FLAGS, \
.parm = &strarray__##array, }
#include "trace/beauty/arch_errno_names.c"
#include "trace/beauty/eventfd.c"
#include "trace/beauty/futex_op.c"
#include "trace/beauty/futex_val3.c"
#include "trace/beauty/mmap.c"
#include "trace/beauty/mode_t.c"
#include "trace/beauty/msg_flags.c"
#include "trace/beauty/open_flags.c"
#include "trace/beauty/perf_event_open.c"
#include "trace/beauty/pid.c"
#include "trace/beauty/sched_policy.c"
#include "trace/beauty/seccomp.c"
#include "trace/beauty/signum.c"
#include "trace/beauty/socket_type.c"
#include "trace/beauty/waitid_options.c"
static const struct syscall_fmt syscall_fmts[] = {
{ .name = "access",
.arg = { [1] = { .scnprintf = SCA_ACCMODE, /* mode */ }, }, },
{ .name = "arch_prctl",
.arg = { [0] = { .scnprintf = SCA_X86_ARCH_PRCTL_CODE, /* code */ },
[1] = { .scnprintf = SCA_PTR, /* arg2 */ }, }, },
{ .name = "bind",
.arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },
[1] = SCA_SOCKADDR_FROM_USER(umyaddr),
[2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },
{ .name = "bpf",
.arg = { [0] = STRARRAY(cmd, bpf_cmd),
[1] = { .from_user = true /* attr */, }, } },
{ .name = "brk", .hexret = true,
.arg = { [0] = { .scnprintf = SCA_PTR, /* brk */ }, }, },
{ .name = "clock_gettime",
.arg = { [0] = STRARRAY(clk_id, clockid), }, },
{ .name = "clock_nanosleep",
.arg = { [2] = SCA_TIMESPEC_FROM_USER(req), }, },
{ .name = "clone", .errpid = true, .nr_args = 5,
.arg = { [0] = { .name = "flags", .scnprintf = SCA_CLONE_FLAGS, },
[1] = { .name = "child_stack", .scnprintf = SCA_HEX, },
[2] = { .name = "parent_tidptr", .scnprintf = SCA_HEX, },
[3] = { .name = "child_tidptr", .scnprintf = SCA_HEX, },
[4] = { .name = "tls", .scnprintf = SCA_HEX, }, }, },
{ .name = "close",
.arg = { [0] = { .scnprintf = SCA_CLOSE_FD, /* fd */ }, }, },
{ .name = "connect",
.arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },
[1] = SCA_SOCKADDR_FROM_USER(servaddr),
[2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },
{ .name = "epoll_ctl",
.arg = { [1] = STRARRAY(op, epoll_ctl_ops), }, },
{ .name = "eventfd2",
.arg = { [1] = { .scnprintf = SCA_EFD_FLAGS, /* flags */ }, }, },
{ .name = "faccessat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ },
[1] = SCA_FILENAME_FROM_USER(pathname),
[2] = { .scnprintf = SCA_ACCMODE, /* mode */ }, }, },
{ .name = "faccessat2",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ },
[1] = SCA_FILENAME_FROM_USER(pathname),
[2] = { .scnprintf = SCA_ACCMODE, /* mode */ },
[3] = { .scnprintf = SCA_FACCESSAT2_FLAGS, /* flags */ }, }, },
{ .name = "fchmodat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "fchownat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "fcntl",
.arg = { [1] = { .scnprintf = SCA_FCNTL_CMD, /* cmd */
.strtoul = STUL_STRARRAYS,
.parm = &strarrays__fcntl_cmds_arrays,
.show_zero = true, },
[2] = { .scnprintf = SCA_FCNTL_ARG, /* arg */ }, }, },
{ .name = "flock",
.arg = { [1] = { .scnprintf = SCA_FLOCK, /* cmd */ }, }, },
{ .name = "fsconfig",
.arg = { [1] = STRARRAY(cmd, fsconfig_cmds), }, },
{ .name = "fsmount",
.arg = { [1] = STRARRAY_FLAGS(flags, fsmount_flags),
[2] = { .scnprintf = SCA_FSMOUNT_ATTR_FLAGS, /* attr_flags */ }, }, },
{ .name = "fspick",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },
[1] = SCA_FILENAME_FROM_USER(path),
[2] = { .scnprintf = SCA_FSPICK_FLAGS, /* flags */ }, }, },
{ .name = "fstat", .alias = "newfstat", },
{ .name = "futex",
.arg = { [1] = { .scnprintf = SCA_FUTEX_OP, /* op */ },
[5] = { .scnprintf = SCA_FUTEX_VAL3, /* val3 */ }, }, },
{ .name = "futimesat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "getitimer",
.arg = { [0] = STRARRAY(which, itimers), }, },
{ .name = "getpid", .errpid = true, },
{ .name = "getpgid", .errpid = true, },
{ .name = "getppid", .errpid = true, },
{ .name = "getrandom",
.arg = { [2] = { .scnprintf = SCA_GETRANDOM_FLAGS, /* flags */ }, }, },
{ .name = "getrlimit",
.arg = { [0] = STRARRAY(resource, rlimit_resources), }, },
{ .name = "getsockopt",
.arg = { [1] = STRARRAY(level, socket_level), }, },
{ .name = "gettid", .errpid = true, },
{ .name = "ioctl",
.arg = {
#if defined(__i386__) || defined(__x86_64__)
/*
* FIXME: Make this available to all arches.
*/
[1] = { .scnprintf = SCA_IOCTL_CMD, /* cmd */ },
[2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },
#else
[2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },
#endif
{ .name = "kcmp", .nr_args = 5,
.arg = { [0] = { .name = "pid1", .scnprintf = SCA_PID, },
[1] = { .name = "pid2", .scnprintf = SCA_PID, },
[2] = { .name = "type", .scnprintf = SCA_KCMP_TYPE, },
[3] = { .name = "idx1", .scnprintf = SCA_KCMP_IDX, },
[4] = { .name = "idx2", .scnprintf = SCA_KCMP_IDX, }, }, },
{ .name = "keyctl",
.arg = { [0] = STRARRAY(option, keyctl_options), }, },
{ .name = "kill",
.arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "linkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "lseek",
.arg = { [2] = STRARRAY(whence, whences), }, },
{ .name = "lstat", .alias = "newlstat", },
{ .name = "madvise",
.arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },
[2] = { .scnprintf = SCA_MADV_BHV, /* behavior */ }, }, },
{ .name = "mkdirat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "mknodat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
{ .name = "mmap", .hexret = true,
/* The standard mmap maps to old_mmap on s390x */
#if defined(__s390x__)
.alias = "old_mmap",
#endif
.arg = { [2] = { .scnprintf = SCA_MMAP_PROT, .show_zero = true, /* prot */ },
[3] = { .scnprintf = SCA_MMAP_FLAGS, /* flags */
.strtoul = STUL_STRARRAY_FLAGS,
.parm = &strarray__mmap_flags, },
[5] = { .scnprintf = SCA_HEX, /* offset */ }, }, },
{ .name = "mount",
.arg = { [0] = SCA_FILENAME_FROM_USER(devname),
[3] = { .scnprintf = SCA_MOUNT_FLAGS, /* flags */
.mask_val = SCAMV_MOUNT_FLAGS, /* flags */ }, }, },
{ .name = "move_mount",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* from_dfd */ },
[1] = SCA_FILENAME_FROM_USER(pathname),
[2] = { .scnprintf = SCA_FDAT, /* to_dfd */ },
[3] = SCA_FILENAME_FROM_USER(pathname),
[4] = { .scnprintf = SCA_MOVE_MOUNT_FLAGS, /* flags */ }, }, },
{ .name = "mprotect",
.arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },
[2] = { .scnprintf = SCA_MMAP_PROT, .show_zero = true, /* prot */ }, }, },
{ .name = "mq_unlink",
.arg = { [0] = SCA_FILENAME_FROM_USER(u_name), }, },
{ .name = "mremap", .hexret = true,
.arg = { [3] = { .scnprintf = SCA_MREMAP_FLAGS, /* flags */ }, }, },
{ .name = "name_to_handle_at",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "nanosleep",
.arg = { [0] = SCA_TIMESPEC_FROM_USER(req), }, },
{ .name = "newfstatat", .alias = "fstatat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ },
[1] = SCA_FILENAME_FROM_USER(pathname),
[3] = { .scnprintf = SCA_FS_AT_FLAGS, /* flags */ }, }, },
{ .name = "open",
.arg = { [1] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
{ .name = "open_by_handle_at",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },
[2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
{ .name = "openat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },
[2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
{ .name = "perf_event_open",
.arg = { [0] = SCA_PERF_ATTR_FROM_USER(attr),
[2] = { .scnprintf = SCA_INT, /* cpu */ },
[3] = { .scnprintf = SCA_FD, /* group_fd */ },
[4] = { .scnprintf = SCA_PERF_FLAGS, /* flags */ }, }, },
{ .name = "pipe2",
.arg = { [1] = { .scnprintf = SCA_PIPE_FLAGS, /* flags */ }, }, },
{ .name = "pkey_alloc",
.arg = { [1] = { .scnprintf = SCA_PKEY_ALLOC_ACCESS_RIGHTS, /* access_rights */ }, }, },
{ .name = "pkey_free",
.arg = { [0] = { .scnprintf = SCA_INT, /* key */ }, }, },
{ .name = "pkey_mprotect",
.arg = { [0] = { .scnprintf = SCA_HEX, /* start */ },
[2] = { .scnprintf = SCA_MMAP_PROT, .show_zero = true, /* prot */ },
[3] = { .scnprintf = SCA_INT, /* pkey */ }, }, },
{ .name = "poll", .timeout = true, },
{ .name = "ppoll", .timeout = true, },
{ .name = "prctl",
.arg = { [0] = { .scnprintf = SCA_PRCTL_OPTION, /* option */
.strtoul = STUL_STRARRAY,
.parm = &strarray__prctl_options, },
[1] = { .scnprintf = SCA_PRCTL_ARG2, /* arg2 */ },
[2] = { .scnprintf = SCA_PRCTL_ARG3, /* arg3 */ }, }, },
{ .name = "pread", .alias = "pread64", },
{ .name = "preadv", .alias = "pread", },
{ .name = "prlimit64",
.arg = { [1] = STRARRAY(resource, rlimit_resources),
[2] = { .from_user = true /* new_rlim */, }, }, },
{ .name = "pwrite", .alias = "pwrite64", },
{ .name = "readlinkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "recvfrom",
.arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "recvmmsg",
.arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "recvmsg",
.arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "renameat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },
[2] = { .scnprintf = SCA_FDAT, /* newdirfd */ }, }, },
{ .name = "renameat2",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },
[2] = { .scnprintf = SCA_FDAT, /* newdirfd */ },
[4] = { .scnprintf = SCA_RENAMEAT2_FLAGS, /* flags */ }, }, },
{ .name = "rseq", .errpid = true,
.arg = { [0] = { .from_user = true /* rseq */, }, }, },
{ .name = "rt_sigaction",
.arg = { [0] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "rt_sigprocmask",
.arg = { [0] = STRARRAY(how, sighow), }, },
{ .name = "rt_sigqueueinfo",
.arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "rt_tgsigqueueinfo",
.arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "sched_setscheduler",
.arg = { [1] = { .scnprintf = SCA_SCHED_POLICY, /* policy */ }, }, },
{ .name = "seccomp",
.arg = { [0] = { .scnprintf = SCA_SECCOMP_OP, /* op */ },
[1] = { .scnprintf = SCA_SECCOMP_FLAGS, /* flags */ }, }, },
{ .name = "select", .timeout = true, },
{ .name = "sendfile", .alias = "sendfile64", },
{ .name = "sendmmsg",
.arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "sendmsg",
.arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
{ .name = "sendto",
.arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ },
[4] = SCA_SOCKADDR_FROM_USER(addr), }, },
{ .name = "set_robust_list", .errpid = true,
.arg = { [0] = { .from_user = true /* head */, }, }, },
{ .name = "set_tid_address", .errpid = true, },
{ .name = "setitimer",
.arg = { [0] = STRARRAY(which, itimers), }, },
{ .name = "setrlimit",
.arg = { [0] = STRARRAY(resource, rlimit_resources),
[1] = { .from_user = true /* rlim */, }, }, },
{ .name = "setsockopt",
.arg = { [1] = STRARRAY(level, socket_level), }, },
{ .name = "socket",
.arg = { [0] = STRARRAY(family, socket_families),
[1] = { .scnprintf = SCA_SK_TYPE, /* type */ },
[2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },
{ .name = "socketpair",
.arg = { [0] = STRARRAY(family, socket_families),
[1] = { .scnprintf = SCA_SK_TYPE, /* type */ },
[2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },
{ .name = "stat", .alias = "newstat", },
{ .name = "statx",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* fdat */ },
[2] = { .scnprintf = SCA_FS_AT_FLAGS, /* flags */ } ,
[3] = { .scnprintf = SCA_STATX_MASK, /* mask */ }, }, },
{ .name = "swapoff",
.arg = { [0] = SCA_FILENAME_FROM_USER(specialfile), }, },
{ .name = "swapon",
.arg = { [0] = SCA_FILENAME_FROM_USER(specialfile), }, },
{ .name = "symlinkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
{ .name = "sync_file_range",
.arg = { [3] = { .scnprintf = SCA_SYNC_FILE_RANGE_FLAGS, /* flags */ }, }, },
{ .name = "tgkill",
.arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "tkill",
.arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
{ .name = "umount2", .alias = "umount",
.arg = { [0] = SCA_FILENAME_FROM_USER(name), }, },
{ .name = "uname", .alias = "newuname", },
{ .name = "unlinkat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ },
[1] = SCA_FILENAME_FROM_USER(pathname),
[2] = { .scnprintf = SCA_FS_AT_FLAGS, /* flags */ }, }, },
{ .name = "utimensat",
.arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ }, }, },
{ .name = "wait4", .errpid = true,
.arg = { [2] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },
{ .name = "waitid", .errpid = true,
.arg = { [3] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },
{ .name = "write", .errpid = true,
.arg = { [1] = { .scnprintf = SCA_BUF /* buf */, .from_user = true, }, }, },
};
static int syscall_fmt__cmp(const void *name, const void *fmtp)
{
const struct syscall_fmt *fmt = fmtp;
return strcmp(name, fmt->name);
}
static const struct syscall_fmt *__syscall_fmt__find(const struct syscall_fmt *fmts,
const int nmemb,
const char *name)
{
return bsearch(name, fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
}
static const struct syscall_fmt *syscall_fmt__find(const char *name)
{
const int nmemb = ARRAY_SIZE(syscall_fmts);
return __syscall_fmt__find(syscall_fmts, nmemb, name);
}
static const struct syscall_fmt *__syscall_fmt__find_by_alias(const struct syscall_fmt *fmts,
const int nmemb, const char *alias)
{
int i;
for (i = 0; i < nmemb; ++i) {
if (fmts[i].alias && strcmp(fmts[i].alias, alias) == 0)
return &fmts[i];
}
return NULL;
}
static const struct syscall_fmt *syscall_fmt__find_by_alias(const char *alias)
{
const int nmemb = ARRAY_SIZE(syscall_fmts);
return __syscall_fmt__find_by_alias(syscall_fmts, nmemb, alias);
}
/*
* is_exit: is this "exit" or "exit_group"?
* is_open: is this "open" or "openat"? To associate the fd returned in sys_exit with the pathname in sys_enter.
* args_size: sum of the sizes of the syscall arguments, anything after that is augmented stuff: pathname for openat, etc.
* nonexistent: Just a hole in the syscall table, syscall id not allocated
*/
struct syscall {
struct tep_event *tp_format;
int nr_args;
int args_size;
struct {
struct bpf_program *sys_enter,
*sys_exit;
} bpf_prog;
bool is_exit;
bool is_open;
bool nonexistent;
bool use_btf;
struct tep_format_field *args;
const char *name;
const struct syscall_fmt *fmt;
struct syscall_arg_fmt *arg_fmt;
};
/*
* We need to have this 'calculated' boolean because in some cases we really
* don't know what is the duration of a syscall, for instance, when we start
* a session and some threads are waiting for a syscall to finish, say 'poll',
* in which case all we can do is to print "( ? ) for duration and for the
* start timestamp.
*/
static size_t fprintf_duration(unsigned long t, bool calculated, FILE *fp)
{
double duration = (double)t / NSEC_PER_MSEC;
size_t printed = fprintf(fp, "(");
if (!calculated)
printed += fprintf(fp, " ");
else if (duration >= 1.0)
printed += color_fprintf(fp, PERF_COLOR_RED, "%6.3f ms", duration);
else if (duration >= 0.01)
printed += color_fprintf(fp, PERF_COLOR_YELLOW, "%6.3f ms", duration);
else
printed += color_fprintf(fp, PERF_COLOR_NORMAL, "%6.3f ms", duration);
return printed + fprintf(fp, "): ");
}
/**
* filename.ptr: The filename char pointer that will be vfs_getname'd
* filename.entry_str_pos: Where to insert the string translated from
* filename.ptr by the vfs_getname tracepoint/kprobe.
* ret_scnprintf: syscall args may set this to a different syscall return
* formatter, for instance, fcntl may return fds, file flags, etc.
*/
struct thread_trace {
u64 entry_time;
bool entry_pending;
unsigned long nr_events;
unsigned long pfmaj, pfmin;
char *entry_str;
double runtime_ms;
size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg);
struct {
unsigned long ptr;
short int entry_str_pos;
bool pending_open;
unsigned int namelen;
char *name;
} filename;
struct {
int max;
struct file *table;
} files;
struct intlist *syscall_stats;
};
static struct thread_trace *thread_trace__new(void)
{
struct thread_trace *ttrace = zalloc(sizeof(struct thread_trace));
if (ttrace) {
ttrace->files.max = -1;
ttrace->syscall_stats = intlist__new(NULL);
}
return ttrace;
}
static void thread_trace__free_files(struct thread_trace *ttrace);
static void thread_trace__delete(void *pttrace)
{
struct thread_trace *ttrace = pttrace;
if (!ttrace)
return;
intlist__delete(ttrace->syscall_stats);
ttrace->syscall_stats = NULL;
thread_trace__free_files(ttrace);
zfree(&ttrace->entry_str);
free(ttrace);
}
static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)
{
struct thread_trace *ttrace;
if (thread == NULL)
goto fail;
if (thread__priv(thread) == NULL)
thread__set_priv(thread, thread_trace__new());
if (thread__priv(thread) == NULL)
goto fail;
ttrace = thread__priv(thread);
++ttrace->nr_events;
return ttrace;
fail:
color_fprintf(fp, PERF_COLOR_RED,
"WARNING: not enough memory, dropping samples!\n");
return NULL;
}
void syscall_arg__set_ret_scnprintf(struct syscall_arg *arg,
size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg))
{
struct thread_trace *ttrace = thread__priv(arg->thread);
ttrace->ret_scnprintf = ret_scnprintf;
}
#define TRACE_PFMAJ (1 << 0)
#define TRACE_PFMIN (1 << 1)
static const size_t trace__entry_str_size = 2048;
static void thread_trace__free_files(struct thread_trace *ttrace)
{
for (int i = 0; i < ttrace->files.max; ++i) {
struct file *file = ttrace->files.table + i;
zfree(&file->pathname);
}
zfree(&ttrace->files.table);
ttrace->files.max = -1;
}
static struct file *thread_trace__files_entry(struct thread_trace *ttrace, int fd)
{
if (fd < 0)
return NULL;
if (fd > ttrace->files.max) {
struct file *nfiles = realloc(ttrace->files.table, (fd + 1) * sizeof(struct file));
if (nfiles == NULL)
return NULL;
if (ttrace->files.max != -1) {
memset(nfiles + ttrace->files.max + 1, 0,
(fd - ttrace->files.max) * sizeof(struct file));
} else {
memset(nfiles, 0, (fd + 1) * sizeof(struct file));
}
ttrace->files.table = nfiles;
ttrace->files.max = fd;
}
return ttrace->files.table + fd;
}
struct file *thread__files_entry(struct thread *thread, int fd)
{
return thread_trace__files_entry(thread__priv(thread), fd);
}
static int trace__set_fd_pathname(struct thread *thread, int fd, const char *pathname)
{
struct thread_trace *ttrace = thread__priv(thread);
struct file *file = thread_trace__files_entry(ttrace, fd);
if (file != NULL) {
struct stat st;
if (stat(pathname, &st) == 0)
file->dev_maj = major(st.st_rdev);
file->pathname = strdup(pathname);
if (file->pathname)
return 0;
}
return -1;
}
static int thread__read_fd_path(struct thread *thread, int fd)
{
char linkname[PATH_MAX], pathname[PATH_MAX];
struct stat st;
int ret;
if (thread__pid(thread) == thread__tid(thread)) {
scnprintf(linkname, sizeof(linkname),
"/proc/%d/fd/%d", thread__pid(thread), fd);
} else {
scnprintf(linkname, sizeof(linkname),
"/proc/%d/task/%d/fd/%d",
thread__pid(thread), thread__tid(thread), fd);
}
if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
return -1;
ret = readlink(linkname, pathname, sizeof(pathname));
if (ret < 0 || ret > st.st_size)
return -1;
pathname[ret] = '\0';
return trace__set_fd_pathname(thread, fd, pathname);
}
static const char *thread__fd_path(struct thread *thread, int fd,
struct trace *trace)
{
struct thread_trace *ttrace = thread__priv(thread);
if (ttrace == NULL || trace->fd_path_disabled)
return NULL;
if (fd < 0)
return NULL;
if ((fd > ttrace->files.max || ttrace->files.table[fd].pathname == NULL)) {
if (!trace->live)
return NULL;
++trace->stats.proc_getname;
if (thread__read_fd_path(thread, fd))
return NULL;
}
return ttrace->files.table[fd].pathname;
}
size_t syscall_arg__scnprintf_fd(char *bf, size_t size, struct syscall_arg *arg)
{
int fd = arg->val;
size_t printed = scnprintf(bf, size, "%d", fd);
const char *path = thread__fd_path(arg->thread, fd, arg->trace);
if (path)
printed += scnprintf(bf + printed, size - printed, "<%s>", path);
return printed;
}
size_t pid__scnprintf_fd(struct trace *trace, pid_t pid, int fd, char *bf, size_t size)
{
size_t printed = scnprintf(bf, size, "%d", fd);
struct thread *thread = machine__find_thread(trace->host, pid, pid);
if (thread) {
const char *path = thread__fd_path(thread, fd, trace);
if (path)
printed += scnprintf(bf + printed, size - printed, "<%s>", path);
thread__put(thread);
}
return printed;
}
static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
struct syscall_arg *arg)
{
int fd = arg->val;
size_t printed = syscall_arg__scnprintf_fd(bf, size, arg);
struct thread_trace *ttrace = thread__priv(arg->thread);
if (ttrace && fd >= 0 && fd <= ttrace->files.max)
zfree(&ttrace->files.table[fd].pathname);
return printed;
}
static void thread__set_filename_pos(struct thread *thread, const char *bf,
unsigned long ptr)
{
struct thread_trace *ttrace = thread__priv(thread);
ttrace->filename.ptr = ptr;
ttrace->filename.entry_str_pos = bf - ttrace->entry_str;
}
static size_t syscall_arg__scnprintf_augmented_string(struct syscall_arg *arg, char *bf, size_t size)
{
struct augmented_arg *augmented_arg = arg->augmented.args;
size_t printed = scnprintf(bf, size, "\"%.*s\"", augmented_arg->size, augmented_arg->value);
/*
* So that the next arg with a payload can consume its augmented arg, i.e. for rename* syscalls
* we would have two strings, each prefixed by its size.
*/
int consumed = sizeof(*augmented_arg) + augmented_arg->size;
arg->augmented.args = ((void *)arg->augmented.args) + consumed;
arg->augmented.size -= consumed;
return printed;
}
static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,
struct syscall_arg *arg)
{
unsigned long ptr = arg->val;
if (arg->augmented.args)
return syscall_arg__scnprintf_augmented_string(arg, bf, size);
if (!arg->trace->vfs_getname)
return scnprintf(bf, size, "%#x", ptr);
thread__set_filename_pos(arg->thread, bf, ptr);
return 0;
}
#define MAX_CONTROL_CHAR 31
#define MAX_ASCII 127
static size_t syscall_arg__scnprintf_buf(char *bf, size_t size, struct syscall_arg *arg)
{
struct augmented_arg *augmented_arg = arg->augmented.args;
unsigned char *orig = (unsigned char *)augmented_arg->value;
size_t printed = 0;
int consumed;
if (augmented_arg == NULL)
return 0;
for (int j = 0; j < augmented_arg->size; ++j) {
bool control_char = orig[j] <= MAX_CONTROL_CHAR || orig[j] >= MAX_ASCII;
/* print control characters (0~31 and 127), and non-ascii characters in \(digits) */
printed += scnprintf(bf + printed, size - printed, control_char ? "\\%d" : "%c", (int)orig[j]);
}
consumed = sizeof(*augmented_arg) + augmented_arg->size;
arg->augmented.args = ((void *)arg->augmented.args) + consumed;
arg->augmented.size -= consumed;
return printed;
}
static bool trace__filter_duration(struct trace *trace, double t)
{
return t < (trace->duration_filter * NSEC_PER_MSEC);
}
static size_t __trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
{
double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;
return fprintf(fp, "%10.3f ", ts);
}
/*
* We're handling tstamp=0 as an undefined tstamp, i.e. like when we are
* using ttrace->entry_time for a thread that receives a sys_exit without
* first having received a sys_enter ("poll" issued before tracing session
* starts, lost sys_enter exit due to ring buffer overflow).
*/
static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
{
if (tstamp > 0)
return __trace__fprintf_tstamp(trace, tstamp, fp);
return fprintf(fp, " ? ");
}
static pid_t workload_pid = -1;
static volatile sig_atomic_t done = false;
static volatile sig_atomic_t interrupted = false;
static void sighandler_interrupt(int sig __maybe_unused)
{
done = interrupted = true;
}
static void sighandler_chld(int sig __maybe_unused, siginfo_t *info,
void *context __maybe_unused)
{
if (info->si_pid == workload_pid)
done = true;
}
static size_t trace__fprintf_comm_tid(struct trace *trace, struct thread *thread, FILE *fp)
{
size_t printed = 0;
if (trace->multiple_threads) {
if (trace->show_comm)
printed += fprintf(fp, "%.14s/", thread__comm_str(thread));
printed += fprintf(fp, "%d ", thread__tid(thread));
}
return printed;
}
static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
u64 duration, bool duration_calculated, u64 tstamp, FILE *fp)
{
size_t printed = 0;
if (trace->show_tstamp)
printed = trace__fprintf_tstamp(trace, tstamp, fp);
if (trace->show_duration)
printed += fprintf_duration(duration, duration_calculated, fp);
return printed + trace__fprintf_comm_tid(trace, thread, fp);
}
static int trace__process_event(struct trace *trace, struct machine *machine,
union perf_event *event, struct perf_sample *sample)
{
int ret = 0;
switch (event->header.type) {
case PERF_RECORD_LOST:
color_fprintf(trace->output, PERF_COLOR_RED,
"LOST %" PRIu64 " events!\n", event->lost.lost);
ret = machine__process_lost_event(machine, event, sample);
break;
default:
ret = machine__process_event(machine, event, sample);
break;
}
return ret;
}
static int trace__tool_process(const struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct trace *trace = container_of(tool, struct trace, tool);
return trace__process_event(trace, machine, event, sample);
}
static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
{
struct machine *machine = vmachine;
if (machine->kptr_restrict_warned)
return NULL;
if (symbol_conf.kptr_restrict) {
pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
"Kernel samples will not be resolved.\n");
machine->kptr_restrict_warned = true;
return NULL;
}
return machine__resolve_kernel_addr(vmachine, addrp, modp);
}
static int trace__symbols_init(struct trace *trace, struct evlist *evlist)
{
int err = symbol__init(NULL);
if (err)
return err;
trace->host = machine__new_host();
if (trace->host == NULL)
return -ENOMEM;
thread__set_priv_destructor(thread_trace__delete);
err = trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr);
if (err < 0)
goto out;
err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
evlist->core.threads, trace__tool_process,
true, false, 1);
out:
if (err)
symbol__exit();
return err;
}
static void trace__symbols__exit(struct trace *trace)
{
machine__exit(trace->host);
trace->host = NULL;
symbol__exit();
}
static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)
{
int idx;
if (nr_args == RAW_SYSCALL_ARGS_NUM && sc->fmt && sc->fmt->nr_args != 0)
nr_args = sc->fmt->nr_args;
sc->arg_fmt = calloc(nr_args, sizeof(*sc->arg_fmt));
if (sc->arg_fmt == NULL)
return -1;
for (idx = 0; idx < nr_args; ++idx) {
if (sc->fmt)
sc->arg_fmt[idx] = sc->fmt->arg[idx];
}
sc->nr_args = nr_args;
return 0;
}
static const struct syscall_arg_fmt syscall_arg_fmts__by_name[] = {
{ .name = "msr", .scnprintf = SCA_X86_MSR, .strtoul = STUL_X86_MSR, },
{ .name = "vector", .scnprintf = SCA_X86_IRQ_VECTORS, .strtoul = STUL_X86_IRQ_VECTORS, },
};
static int syscall_arg_fmt__cmp(const void *name, const void *fmtp)
{
const struct syscall_arg_fmt *fmt = fmtp;
return strcmp(name, fmt->name);
}
static const struct syscall_arg_fmt *
__syscall_arg_fmt__find_by_name(const struct syscall_arg_fmt *fmts, const int nmemb,
const char *name)
{
return bsearch(name, fmts, nmemb, sizeof(struct syscall_arg_fmt), syscall_arg_fmt__cmp);
}
static const struct syscall_arg_fmt *syscall_arg_fmt__find_by_name(const char *name)
{
const int nmemb = ARRAY_SIZE(syscall_arg_fmts__by_name);
return __syscall_arg_fmt__find_by_name(syscall_arg_fmts__by_name, nmemb, name);
}
static struct tep_format_field *
syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field *field,
bool *use_btf)
{
struct tep_format_field *last_field = NULL;
int len;
for (; field; field = field->next, ++arg) {
last_field = field;
if (arg->scnprintf)
continue;
len = strlen(field->name);
// As far as heuristics (or intention) goes this seems to hold true, and makes sense!
if ((field->flags & TEP_FIELD_IS_POINTER) && strstarts(field->type, "const "))
arg->from_user = true;
if (strcmp(field->type, "const char *") == 0 &&
((len >= 4 && strcmp(field->name + len - 4, "name") == 0) ||
strstr(field->name, "path") != NULL)) {
arg->scnprintf = SCA_FILENAME;
} else if ((field->flags & TEP_FIELD_IS_POINTER) || strstr(field->name, "addr"))
arg->scnprintf = SCA_PTR;
else if (strcmp(field->type, "pid_t") == 0)
arg->scnprintf = SCA_PID;
else if (strcmp(field->type, "umode_t") == 0)
arg->scnprintf = SCA_MODE_T;
else if ((field->flags & TEP_FIELD_IS_ARRAY) && strstr(field->type, "char")) {
arg->scnprintf = SCA_CHAR_ARRAY;
arg->nr_entries = field->arraylen;
} else if ((strcmp(field->type, "int") == 0 ||
strcmp(field->type, "unsigned int") == 0 ||
strcmp(field->type, "long") == 0) &&
len >= 2 && strcmp(field->name + len - 2, "fd") == 0) {
/*
* /sys/kernel/tracing/events/syscalls/sys_enter*
* grep -E 'field:.*fd;' .../format|sed -r 's/.*field:([a-z ]+) [a-z_]*fd.+/\1/g'|sort|uniq -c
* 65 int
* 23 unsigned int
* 7 unsigned long
*/
arg->scnprintf = SCA_FD;
} else if (strstr(field->type, "enum") && use_btf != NULL) {
*use_btf = true;
arg->strtoul = STUL_BTF_TYPE;
} else {
const struct syscall_arg_fmt *fmt =
syscall_arg_fmt__find_by_name(field->name);
if (fmt) {
arg->scnprintf = fmt->scnprintf;
arg->strtoul = fmt->strtoul;
}
}
}
return last_field;
}
static int syscall__set_arg_fmts(struct syscall *sc)
{
struct tep_format_field *last_field = syscall_arg_fmt__init_array(sc->arg_fmt, sc->args,
&sc->use_btf);
if (last_field)
sc->args_size = last_field->offset + last_field->size;
return 0;
}
static int trace__read_syscall_info(struct trace *trace, int id)
{
char tp_name[128];
struct syscall *sc;
const char *name = syscalltbl__name(trace->sctbl, id);
int err;
#ifdef HAVE_SYSCALL_TABLE_SUPPORT
if (trace->syscalls.table == NULL) {
trace->syscalls.table = calloc(trace->sctbl->syscalls.max_id + 1, sizeof(*sc));
if (trace->syscalls.table == NULL)
return -ENOMEM;
}
#else
if (id > trace->sctbl->syscalls.max_id || (id == 0 && trace->syscalls.table == NULL)) {
// When using libaudit we don't know beforehand what is the max syscall id
struct syscall *table = realloc(trace->syscalls.table, (id + 1) * sizeof(*sc));
if (table == NULL)
return -ENOMEM;
// Need to memset from offset 0 and +1 members if brand new
if (trace->syscalls.table == NULL)
memset(table, 0, (id + 1) * sizeof(*sc));
else
memset(table + trace->sctbl->syscalls.max_id + 1, 0, (id - trace->sctbl->syscalls.max_id) * sizeof(*sc));
trace->syscalls.table = table;
trace->sctbl->syscalls.max_id = id;
}
#endif
sc = trace->syscalls.table + id;
if (sc->nonexistent)
return -EEXIST;
if (name == NULL) {
sc->nonexistent = true;
return -EEXIST;
}
sc->name = name;
sc->fmt = syscall_fmt__find(sc->name);
snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
sc->tp_format = trace_event__tp_format("syscalls", tp_name);
if (IS_ERR(sc->tp_format) && sc->fmt && sc->fmt->alias) {
snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
sc->tp_format = trace_event__tp_format("syscalls", tp_name);
}
/*
* Fails to read trace point format via sysfs node, so the trace point
* doesn't exist. Set the 'nonexistent' flag as true.
*/
if (IS_ERR(sc->tp_format)) {
sc->nonexistent = true;
return PTR_ERR(sc->tp_format);
}
if (syscall__alloc_arg_fmts(sc, IS_ERR(sc->tp_format) ?
RAW_SYSCALL_ARGS_NUM : sc->tp_format->format.nr_fields))
return -ENOMEM;
sc->args = sc->tp_format->format.fields;
/*
* We need to check and discard the first variable '__syscall_nr'
* or 'nr' that mean the syscall number. It is needless here.
* So drop '__syscall_nr' or 'nr' field but does not exist on older kernels.
*/
if (sc->args && (!strcmp(sc->args->name, "__syscall_nr") || !strcmp(sc->args->name, "nr"))) {
sc->args = sc->args->next;
--sc->nr_args;
}
sc->is_exit = !strcmp(name, "exit_group") || !strcmp(name, "exit");
sc->is_open = !strcmp(name, "open") || !strcmp(name, "openat");
err = syscall__set_arg_fmts(sc);
/* after calling syscall__set_arg_fmts() we'll know whether use_btf is true */
if (sc->use_btf)
trace__load_vmlinux_btf(trace);
return err;
}
static int evsel__init_tp_arg_scnprintf(struct evsel *evsel, bool *use_btf)
{
struct syscall_arg_fmt *fmt = evsel__syscall_arg_fmt(evsel);
if (fmt != NULL) {
syscall_arg_fmt__init_array(fmt, evsel->tp_format->format.fields, use_btf);
return 0;
}
return -ENOMEM;
}
static int intcmp(const void *a, const void *b)
{
const int *one = a, *another = b;
return *one - *another;
}
static int trace__validate_ev_qualifier(struct trace *trace)
{
int err = 0;
bool printed_invalid_prefix = false;
struct str_node *pos;
size_t nr_used = 0, nr_allocated = strlist__nr_entries(trace->ev_qualifier);
trace->ev_qualifier_ids.entries = malloc(nr_allocated *
sizeof(trace->ev_qualifier_ids.entries[0]));
if (trace->ev_qualifier_ids.entries == NULL) {
fputs("Error:\tNot enough memory for allocating events qualifier ids\n",
trace->output);
err = -EINVAL;
goto out;
}
strlist__for_each_entry(pos, trace->ev_qualifier) {
const char *sc = pos->s;
int id = syscalltbl__id(trace->sctbl, sc), match_next = -1;
if (id < 0) {
id = syscalltbl__strglobmatch_first(trace->sctbl, sc, &match_next);
if (id >= 0)
goto matches;
if (!printed_invalid_prefix) {
pr_debug("Skipping unknown syscalls: ");
printed_invalid_prefix = true;
} else {
pr_debug(", ");
}
pr_debug("%s", sc);
continue;
}
matches:
trace->ev_qualifier_ids.entries[nr_used++] = id;
if (match_next == -1)
continue;
while (1) {
id = syscalltbl__strglobmatch_next(trace->sctbl, sc, &match_next);
if (id < 0)
break;
if (nr_allocated == nr_used) {
void *entries;
nr_allocated += 8;
entries = realloc(trace->ev_qualifier_ids.entries,
nr_allocated * sizeof(trace->ev_qualifier_ids.entries[0]));
if (entries == NULL) {
err = -ENOMEM;
fputs("\nError:\t Not enough memory for parsing\n", trace->output);
goto out_free;
}
trace->ev_qualifier_ids.entries = entries;
}
trace->ev_qualifier_ids.entries[nr_used++] = id;
}
}
trace->ev_qualifier_ids.nr = nr_used;
qsort(trace->ev_qualifier_ids.entries, nr_used, sizeof(int), intcmp);
out:
if (printed_invalid_prefix)
pr_debug("\n");
return err;
out_free:
zfree(&trace->ev_qualifier_ids.entries);
trace->ev_qualifier_ids.nr = 0;
goto out;
}
static __maybe_unused bool trace__syscall_enabled(struct trace *trace, int id)
{
bool in_ev_qualifier;
if (trace->ev_qualifier_ids.nr == 0)
return true;
in_ev_qualifier = bsearch(&id, trace->ev_qualifier_ids.entries,
trace->ev_qualifier_ids.nr, sizeof(int), intcmp) != NULL;
if (in_ev_qualifier)
return !trace->not_ev_qualifier;
return trace->not_ev_qualifier;
}
/*
* args is to be interpreted as a series of longs but we need to handle
* 8-byte unaligned accesses. args points to raw_data within the event
* and raw_data is guaranteed to be 8-byte unaligned because it is
* preceded by raw_size which is a u32. So we need to copy args to a temp
* variable to read it. Most notably this avoids extended load instructions
* on unaligned addresses
*/
unsigned long syscall_arg__val(struct syscall_arg *arg, u8 idx)
{
unsigned long val;
unsigned char *p = arg->args + sizeof(unsigned long) * idx;
memcpy(&val, p, sizeof(val));
return val;
}
static size_t syscall__scnprintf_name(struct syscall *sc, char *bf, size_t size,
struct syscall_arg *arg)
{
if (sc->arg_fmt && sc->arg_fmt[arg->idx].name)
return scnprintf(bf, size, "%s: ", sc->arg_fmt[arg->idx].name);
return scnprintf(bf, size, "arg%d: ", arg->idx);
}
/*
* Check if the value is in fact zero, i.e. mask whatever needs masking, such
* as mount 'flags' argument that needs ignoring some magic flag, see comment
* in tools/perf/trace/beauty/mount_flags.c
*/
static unsigned long syscall_arg_fmt__mask_val(struct syscall_arg_fmt *fmt, struct syscall_arg *arg, unsigned long val)
{
if (fmt && fmt->mask_val)
return fmt->mask_val(arg, val);
return val;
}
static size_t syscall_arg_fmt__scnprintf_val(struct syscall_arg_fmt *fmt, char *bf, size_t size,
struct syscall_arg *arg, unsigned long val)
{
if (fmt && fmt->scnprintf) {
arg->val = val;
if (fmt->parm)
arg->parm = fmt->parm;
return fmt->scnprintf(bf, size, arg);
}
return scnprintf(bf, size, "%ld", val);
}
static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
unsigned char *args, void *augmented_args, int augmented_args_size,
struct trace *trace, struct thread *thread)
{
size_t printed = 0, btf_printed;
unsigned long val;
u8 bit = 1;
struct syscall_arg arg = {
.args = args,
.augmented = {
.size = augmented_args_size,
.args = augmented_args,
},
.idx = 0,
.mask = 0,
.trace = trace,
.thread = thread,
.show_string_prefix = trace->show_string_prefix,
};
struct thread_trace *ttrace = thread__priv(thread);
void *default_scnprintf;
/*
* Things like fcntl will set this in its 'cmd' formatter to pick the
* right formatter for the return value (an fd? file flags?), which is
* not needed for syscalls that always return a given type, say an fd.
*/
ttrace->ret_scnprintf = NULL;
if (sc->args != NULL) {
struct tep_format_field *field;
for (field = sc->args; field;
field = field->next, ++arg.idx, bit <<= 1) {
if (arg.mask & bit)
continue;
arg.fmt = &sc->arg_fmt[arg.idx];
val = syscall_arg__val(&arg, arg.idx);
/*
* Some syscall args need some mask, most don't and
* return val untouched.
*/
val = syscall_arg_fmt__mask_val(&sc->arg_fmt[arg.idx], &arg, val);
/*
* Suppress this argument if its value is zero and show_zero
* property isn't set.
*
* If it has a BTF type, then override the zero suppression knob
* as the common case is for zero in an enum to have an associated entry.
*/
if (val == 0 && !trace->show_zeros &&
!(sc->arg_fmt && sc->arg_fmt[arg.idx].show_zero) &&
!(sc->arg_fmt && sc->arg_fmt[arg.idx].strtoul == STUL_BTF_TYPE))
continue;
printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");
if (trace->show_arg_names)
printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);
default_scnprintf = sc->arg_fmt[arg.idx].scnprintf;
if (trace->force_btf || default_scnprintf == NULL || default_scnprintf == SCA_PTR) {
btf_printed = trace__btf_scnprintf(trace, &arg, bf + printed,
size - printed, val, field->type);
if (btf_printed) {
printed += btf_printed;
continue;
}
}
printed += syscall_arg_fmt__scnprintf_val(&sc->arg_fmt[arg.idx],
bf + printed, size - printed, &arg, val);
}
} else if (IS_ERR(sc->tp_format)) {
/*
* If we managed to read the tracepoint /format file, then we
* may end up not having any args, like with gettid(), so only
* print the raw args when we didn't manage to read it.
*/
while (arg.idx < sc->nr_args) {
if (arg.mask & bit)
goto next_arg;
val = syscall_arg__val(&arg, arg.idx);
if (printed)
printed += scnprintf(bf + printed, size - printed, ", ");
printed += syscall__scnprintf_name(sc, bf + printed, size - printed, &arg);
printed += syscall_arg_fmt__scnprintf_val(&sc->arg_fmt[arg.idx], bf + printed, size - printed, &arg, val);
next_arg:
++arg.idx;
bit <<= 1;
}
}
return printed;
}
typedef int (*tracepoint_handler)(struct trace *trace, struct evsel *evsel,
union perf_event *event,
struct perf_sample *sample);
static struct syscall *trace__syscall_info(struct trace *trace,
struct evsel *evsel, int id)
{
int err = 0;
if (id < 0) {
/*
* XXX: Noticed on x86_64, reproduced as far back as 3.0.36, haven't tried
* before that, leaving at a higher verbosity level till that is
* explained. Reproduced with plain ftrace with:
*
* echo 1 > /t/events/raw_syscalls/sys_exit/enable
* grep "NR -1 " /t/trace_pipe
*
* After generating some load on the machine.
*/
if (verbose > 1) {
static u64 n;
fprintf(trace->output, "Invalid syscall %d id, skipping (%s, %" PRIu64 ") ...\n",
id, evsel__name(evsel), ++n);
}
return NULL;
}
err = -EINVAL;
#ifdef HAVE_SYSCALL_TABLE_SUPPORT
if (id > trace->sctbl->syscalls.max_id) {
#else
if (id >= trace->sctbl->syscalls.max_id) {
/*
* With libaudit we don't know beforehand what is the max_id,
* so we let trace__read_syscall_info() figure that out as we
* go on reading syscalls.
*/
err = trace__read_syscall_info(trace, id);
if (err)
#endif
goto out_cant_read;
}
if ((trace->syscalls.table == NULL || trace->syscalls.table[id].name == NULL) &&
(err = trace__read_syscall_info(trace, id)) != 0)
goto out_cant_read;
if (trace->syscalls.table && trace->syscalls.table[id].nonexistent)
goto out_cant_read;
return &trace->syscalls.table[id];
out_cant_read:
if (verbose > 0) {
char sbuf[STRERR_BUFSIZE];
fprintf(trace->output, "Problems reading syscall %d: %d (%s)", id, -err, str_error_r(-err, sbuf, sizeof(sbuf)));
if (id <= trace->sctbl->syscalls.max_id && trace->syscalls.table[id].name != NULL)
fprintf(trace->output, "(%s)", trace->syscalls.table[id].name);
fputs(" information\n", trace->output);
}
return NULL;
}
struct syscall_stats {
struct stats stats;
u64 nr_failures;
int max_errno;
u32 *errnos;
};
static void thread__update_stats(struct thread *thread, struct thread_trace *ttrace,
int id, struct perf_sample *sample, long err, bool errno_summary)
{
struct int_node *inode;
struct syscall_stats *stats;
u64 duration = 0;
inode = intlist__findnew(ttrace->syscall_stats, id);
if (inode == NULL)
return;
stats = inode->priv;
if (stats == NULL) {
stats = zalloc(sizeof(*stats));
if (stats == NULL)
return;
init_stats(&stats->stats);
inode->priv = stats;
}
if (ttrace->entry_time && sample->time > ttrace->entry_time)
duration = sample->time - ttrace->entry_time;
update_stats(&stats->stats, duration);
if (err < 0) {
++stats->nr_failures;
if (!errno_summary)
return;
err = -err;
if (err > stats->max_errno) {
u32 *new_errnos = realloc(stats->errnos, err * sizeof(u32));
if (new_errnos) {
memset(new_errnos + stats->max_errno, 0, (err - stats->max_errno) * sizeof(u32));
} else {
pr_debug("Not enough memory for errno stats for thread \"%s\"(%d/%d), results will be incomplete\n",
thread__comm_str(thread), thread__pid(thread),
thread__tid(thread));
return;
}
stats->errnos = new_errnos;
stats->max_errno = err;
}
++stats->errnos[err - 1];
}
}
static int trace__printf_interrupted_entry(struct trace *trace)
{
struct thread_trace *ttrace;
size_t printed;
int len;
if (trace->failure_only || trace->current == NULL)
return 0;
ttrace = thread__priv(trace->current);
if (!ttrace->entry_pending)
return 0;
printed = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output);
printed += len = fprintf(trace->output, "%s)", ttrace->entry_str);
if (len < trace->args_alignment - 4)
printed += fprintf(trace->output, "%-*s", trace->args_alignment - 4 - len, " ");
printed += fprintf(trace->output, " ...\n");
ttrace->entry_pending = false;
++trace->nr_events_printed;
return printed;
}
static int trace__fprintf_sample(struct trace *trace, struct evsel *evsel,
struct perf_sample *sample, struct thread *thread)
{
int printed = 0;
if (trace->print_sample) {
double ts = (double)sample->time / NSEC_PER_MSEC;
printed += fprintf(trace->output, "%22s %10.3f %s %d/%d [%d]\n",
evsel__name(evsel), ts,
thread__comm_str(thread),
sample->pid, sample->tid, sample->cpu);
}
return printed;
}
static void *syscall__augmented_args(struct syscall *sc, struct perf_sample *sample, int *augmented_args_size, int raw_augmented_args_size)
{
void *augmented_args = NULL;
/*
* For now with BPF raw_augmented we hook into raw_syscalls:sys_enter
* and there we get all 6 syscall args plus the tracepoint common fields
* that gets calculated at the start and the syscall_nr (another long).
* So we check if that is the case and if so don't look after the
* sc->args_size but always after the full raw_syscalls:sys_enter payload,
* which is fixed.
*
* We'll revisit this later to pass s->args_size to the BPF augmenter
* (now tools/perf/examples/bpf/augmented_raw_syscalls.c, so that it
* copies only what we need for each syscall, like what happens when we
* use syscalls:sys_enter_NAME, so that we reduce the kernel/userspace
* traffic to just what is needed for each syscall.
*/
int args_size = raw_augmented_args_size ?: sc->args_size;
*augmented_args_size = sample->raw_size - args_size;
if (*augmented_args_size > 0)
augmented_args = sample->raw_data + args_size;
return augmented_args;
}
static void syscall__exit(struct syscall *sc)
{
if (!sc)
return;
zfree(&sc->arg_fmt);
}
static int trace__sys_enter(struct trace *trace, struct evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
char *msg;
void *args;
int printed = 0;
struct thread *thread;
int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;
int augmented_args_size = 0;
void *augmented_args = NULL;
struct syscall *sc = trace__syscall_info(trace, evsel, id);
struct thread_trace *ttrace;
if (sc == NULL)
return -1;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
goto out_put;
trace__fprintf_sample(trace, evsel, sample, thread);
args = perf_evsel__sc_tp_ptr(evsel, args, sample);
if (ttrace->entry_str == NULL) {
ttrace->entry_str = malloc(trace__entry_str_size);
if (!ttrace->entry_str)
goto out_put;
}
if (!(trace->duration_filter || trace->summary_only || trace->min_stack))
trace__printf_interrupted_entry(trace);
/*
* If this is raw_syscalls.sys_enter, then it always comes with the 6 possible
* arguments, even if the syscall being handled, say "openat", uses only 4 arguments
* this breaks syscall__augmented_args() check for augmented args, as we calculate
* syscall->args_size using each syscalls:sys_enter_NAME tracefs format file,
* so when handling, say the openat syscall, we end up getting 6 args for the
* raw_syscalls:sys_enter event, when we expected just 4, we end up mistakenly
* thinking that the extra 2 u64 args are the augmented filename, so just check
* here and avoid using augmented syscalls when the evsel is the raw_syscalls one.
*/
if (evsel != trace->syscalls.events.sys_enter)
augmented_args = syscall__augmented_args(sc, sample, &augmented_args_size, trace->raw_augmented_syscalls_args_size);
ttrace->entry_time = sample->time;
msg = ttrace->entry_str;
printed += scnprintf(msg + printed, trace__entry_str_size - printed, "%s(", sc->name);
printed += syscall__scnprintf_args(sc, msg + printed, trace__entry_str_size - printed,
args, augmented_args, augmented_args_size, trace, thread);
if (sc->is_exit) {
if (!(trace->duration_filter || trace->summary_only || trace->failure_only || trace->min_stack)) {
int alignment = 0;
trace__fprintf_entry_head(trace, thread, 0, false, ttrace->entry_time, trace->output);
printed = fprintf(trace->output, "%s)", ttrace->entry_str);
if (trace->args_alignment > printed)
alignment = trace->args_alignment - printed;
fprintf(trace->output, "%*s= ?\n", alignment, " ");
}
} else {
ttrace->entry_pending = true;
/* See trace__vfs_getname & trace__sys_exit */
ttrace->filename.pending_open = false;
}
if (trace->current != thread) {
thread__put(trace->current);
trace->current = thread__get(thread);
}
err = 0;
out_put:
thread__put(thread);
return err;
}
static int trace__fprintf_sys_enter(struct trace *trace, struct evsel *evsel,
struct perf_sample *sample)
{
struct thread_trace *ttrace;
struct thread *thread;
int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;
struct syscall *sc = trace__syscall_info(trace, evsel, id);
char msg[1024];
void *args, *augmented_args = NULL;
int augmented_args_size;
if (sc == NULL)
return -1;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
ttrace = thread__trace(thread, trace->output);
/*
* We need to get ttrace just to make sure it is there when syscall__scnprintf_args()
* and the rest of the beautifiers accessing it via struct syscall_arg touches it.
*/
if (ttrace == NULL)
goto out_put;
args = perf_evsel__sc_tp_ptr(evsel, args, sample);
augmented_args = syscall__augmented_args(sc, sample, &augmented_args_size, trace->raw_augmented_syscalls_args_size);
syscall__scnprintf_args(sc, msg, sizeof(msg), args, augmented_args, augmented_args_size, trace, thread);
fprintf(trace->output, "%s", msg);
err = 0;
out_put:
thread__put(thread);
return err;
}
static int trace__resolve_callchain(struct trace *trace, struct evsel *evsel,
struct perf_sample *sample,
struct callchain_cursor *cursor)
{
struct addr_location al;
int max_stack = evsel->core.attr.sample_max_stack ?
evsel->core.attr.sample_max_stack :
trace->max_stack;
int err = -1;
addr_location__init(&al);
if (machine__resolve(trace->host, &al, sample) < 0)
goto out;
err = thread__resolve_callchain(al.thread, cursor, evsel, sample, NULL, NULL, max_stack);
out:
addr_location__exit(&al);
return err;
}
static int trace__fprintf_callchain(struct trace *trace, struct perf_sample *sample)
{
/* TODO: user-configurable print_opts */
const unsigned int print_opts = EVSEL__PRINT_SYM |
EVSEL__PRINT_DSO |
EVSEL__PRINT_UNKNOWN_AS_ADDR;
return sample__fprintf_callchain(sample, 38, print_opts, get_tls_callchain_cursor(), symbol_conf.bt_stop_list, trace->output);
}
static const char *errno_to_name(struct evsel *evsel, int err)
{
struct perf_env *env = evsel__env(evsel);
return perf_env__arch_strerrno(env, err);
}
static int trace__sys_exit(struct trace *trace, struct evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
long ret;
u64 duration = 0;
bool duration_calculated = false;
struct thread *thread;
int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1, callchain_ret = 0, printed = 0;
int alignment = trace->args_alignment;
struct syscall *sc = trace__syscall_info(trace, evsel, id);
struct thread_trace *ttrace;
if (sc == NULL)
return -1;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
goto out_put;
trace__fprintf_sample(trace, evsel, sample, thread);
ret = perf_evsel__sc_tp_uint(evsel, ret, sample);
if (trace->summary)
thread__update_stats(thread, ttrace, id, sample, ret, trace->errno_summary);
if (!trace->fd_path_disabled && sc->is_open && ret >= 0 && ttrace->filename.pending_open) {
trace__set_fd_pathname(thread, ret, ttrace->filename.name);
ttrace->filename.pending_open = false;
++trace->stats.vfs_getname;
}
if (ttrace->entry_time) {
duration = sample->time - ttrace->entry_time;
if (trace__filter_duration(trace, duration))
goto out;
duration_calculated = true;
} else if (trace->duration_filter)
goto out;
if (sample->callchain) {
struct callchain_cursor *cursor = get_tls_callchain_cursor();
callchain_ret = trace__resolve_callchain(trace, evsel, sample, cursor);
if (callchain_ret == 0) {
if (cursor->nr < trace->min_stack)
goto out;
callchain_ret = 1;
}
}
if (trace->summary_only || (ret >= 0 && trace->failure_only))
goto out;
trace__fprintf_entry_head(trace, thread, duration, duration_calculated, ttrace->entry_time, trace->output);
if (ttrace->entry_pending) {
printed = fprintf(trace->output, "%s", ttrace->entry_str);
} else {
printed += fprintf(trace->output, " ... [");
color_fprintf(trace->output, PERF_COLOR_YELLOW, "continued");
printed += 9;
printed += fprintf(trace->output, "]: %s()", sc->name);
}
printed++; /* the closing ')' */
if (alignment > printed)
alignment -= printed;
else
alignment = 0;
fprintf(trace->output, ")%*s= ", alignment, " ");
if (sc->fmt == NULL) {
if (ret < 0)
goto errno_print;
signed_print:
fprintf(trace->output, "%ld", ret);
} else if (ret < 0) {
errno_print: {
char bf[STRERR_BUFSIZE];
const char *emsg = str_error_r(-ret, bf, sizeof(bf)),
*e = errno_to_name(evsel, -ret);
fprintf(trace->output, "-1 %s (%s)", e, emsg);
}
} else if (ret == 0 && sc->fmt->timeout)
fprintf(trace->output, "0 (Timeout)");
else if (ttrace->ret_scnprintf) {
char bf[1024];
struct syscall_arg arg = {
.val = ret,
.thread = thread,
.trace = trace,
};
ttrace->ret_scnprintf(bf, sizeof(bf), &arg);
ttrace->ret_scnprintf = NULL;
fprintf(trace->output, "%s", bf);
} else if (sc->fmt->hexret)
fprintf(trace->output, "%#lx", ret);
else if (sc->fmt->errpid) {
struct thread *child = machine__find_thread(trace->host, ret, ret);
if (child != NULL) {
fprintf(trace->output, "%ld", ret);
if (thread__comm_set(child))
fprintf(trace->output, " (%s)", thread__comm_str(child));
thread__put(child);
}
} else
goto signed_print;
fputc('\n', trace->output);
/*
* We only consider an 'event' for the sake of --max-events a non-filtered
* sys_enter + sys_exit and other tracepoint events.
*/
if (++trace->nr_events_printed == trace->max_events && trace->max_events != ULONG_MAX)
interrupted = true;
if (callchain_ret > 0)
trace__fprintf_callchain(trace, sample);
else if (callchain_ret < 0)
pr_err("Problem processing %s callchain, skipping...\n", evsel__name(evsel));
out:
ttrace->entry_pending = false;
err = 0;
out_put:
thread__put(thread);
return err;
}
static int trace__vfs_getname(struct trace *trace, struct evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
struct thread *thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
struct thread_trace *ttrace;
size_t filename_len, entry_str_len, to_move;
ssize_t remaining_space;
char *pos;
const char *filename = evsel__rawptr(evsel, sample, "pathname");
if (!thread)
goto out;
ttrace = thread__priv(thread);
if (!ttrace)
goto out_put;
filename_len = strlen(filename);
if (filename_len == 0)
goto out_put;
if (ttrace->filename.namelen < filename_len) {
char *f = realloc(ttrace->filename.name, filename_len + 1);
if (f == NULL)
goto out_put;
ttrace->filename.namelen = filename_len;
ttrace->filename.name = f;
}
strcpy(ttrace->filename.name, filename);
ttrace->filename.pending_open = true;
if (!ttrace->filename.ptr)
goto out_put;
entry_str_len = strlen(ttrace->entry_str);
remaining_space = trace__entry_str_size - entry_str_len - 1; /* \0 */
if (remaining_space <= 0)
goto out_put;
if (filename_len > (size_t)remaining_space) {
filename += filename_len - remaining_space;
filename_len = remaining_space;
}
to_move = entry_str_len - ttrace->filename.entry_str_pos + 1; /* \0 */
pos = ttrace->entry_str + ttrace->filename.entry_str_pos;
memmove(pos + filename_len, pos, to_move);
memcpy(pos, filename, filename_len);
ttrace->filename.ptr = 0;
ttrace->filename.entry_str_pos = 0;
out_put:
thread__put(thread);
out:
return 0;
}
static int trace__sched_stat_runtime(struct trace *trace, struct evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
u64 runtime = evsel__intval(evsel, sample, "runtime");
double runtime_ms = (double)runtime / NSEC_PER_MSEC;
struct thread *thread = machine__findnew_thread(trace->host,
sample->pid,
sample->tid);
struct thread_trace *ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
goto out_dump;
ttrace->runtime_ms += runtime_ms;
trace->runtime_ms += runtime_ms;
out_put:
thread__put(thread);
return 0;
out_dump:
fprintf(trace->output, "%s: comm=%s,pid=%u,runtime=%" PRIu64 ",vruntime=%" PRIu64 ")\n",
evsel->name,
evsel__strval(evsel, sample, "comm"),
(pid_t)evsel__intval(evsel, sample, "pid"),
runtime,
evsel__intval(evsel, sample, "vruntime"));
goto out_put;
}
static int bpf_output__printer(enum binary_printer_ops op,
unsigned int val, void *extra __maybe_unused, FILE *fp)
{
unsigned char ch = (unsigned char)val;
switch (op) {
case BINARY_PRINT_CHAR_DATA:
return fprintf(fp, "%c", isprint(ch) ? ch : '.');
case BINARY_PRINT_DATA_BEGIN:
case BINARY_PRINT_LINE_BEGIN:
case BINARY_PRINT_ADDR:
case BINARY_PRINT_NUM_DATA:
case BINARY_PRINT_NUM_PAD:
case BINARY_PRINT_SEP:
case BINARY_PRINT_CHAR_PAD:
case BINARY_PRINT_LINE_END:
case BINARY_PRINT_DATA_END:
default:
break;
}
return 0;
}
static void bpf_output__fprintf(struct trace *trace,
struct perf_sample *sample)
{
binary__fprintf(sample->raw_data, sample->raw_size, 8,
bpf_output__printer, NULL, trace->output);
++trace->nr_events_printed;
}
static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel, struct perf_sample *sample,
struct thread *thread, void *augmented_args, int augmented_args_size)
{
char bf[2048];
size_t size = sizeof(bf);
struct tep_format_field *field = evsel->tp_format->format.fields;
struct syscall_arg_fmt *arg = __evsel__syscall_arg_fmt(evsel);
size_t printed = 0, btf_printed;
unsigned long val;
u8 bit = 1;
struct syscall_arg syscall_arg = {
.augmented = {
.size = augmented_args_size,
.args = augmented_args,
},
.idx = 0,
.mask = 0,
.trace = trace,
.thread = thread,
.show_string_prefix = trace->show_string_prefix,
};
for (; field && arg; field = field->next, ++syscall_arg.idx, bit <<= 1, ++arg) {
if (syscall_arg.mask & bit)
continue;
syscall_arg.len = 0;
syscall_arg.fmt = arg;
if (field->flags & TEP_FIELD_IS_ARRAY) {
int offset = field->offset;
if (field->flags & TEP_FIELD_IS_DYNAMIC) {
offset = format_field__intval(field, sample, evsel->needs_swap);
syscall_arg.len = offset >> 16;
offset &= 0xffff;
if (tep_field_is_relative(field->flags))
offset += field->offset + field->size;
}
val = (uintptr_t)(sample->raw_data + offset);
} else
val = format_field__intval(field, sample, evsel->needs_swap);
/*
* Some syscall args need some mask, most don't and
* return val untouched.
*/
val = syscall_arg_fmt__mask_val(arg, &syscall_arg, val);
/* Suppress this argument if its value is zero and show_zero property isn't set. */
if (val == 0 && !trace->show_zeros && !arg->show_zero && arg->strtoul != STUL_BTF_TYPE)
continue;
printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");
if (trace->show_arg_names)
printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);
btf_printed = trace__btf_scnprintf(trace, &syscall_arg, bf + printed, size - printed, val, field->type);
if (btf_printed) {
printed += btf_printed;
continue;
}
printed += syscall_arg_fmt__scnprintf_val(arg, bf + printed, size - printed, &syscall_arg, val);
}
return printed + fprintf(trace->output, "%s", bf);
}
static int trace__event_handler(struct trace *trace, struct evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
struct thread *thread;
int callchain_ret = 0;
/*
* Check if we called perf_evsel__disable(evsel) due to, for instance,
* this event's max_events having been hit and this is an entry coming
* from the ring buffer that we should discard, since the max events
* have already been considered/printed.
*/
if (evsel->disabled)
return 0;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
if (sample->callchain) {
struct callchain_cursor *cursor = get_tls_callchain_cursor();
callchain_ret = trace__resolve_callchain(trace, evsel, sample, cursor);
if (callchain_ret == 0) {
if (cursor->nr < trace->min_stack)
goto out;
callchain_ret = 1;
}
}
trace__printf_interrupted_entry(trace);
trace__fprintf_tstamp(trace, sample->time, trace->output);
if (trace->trace_syscalls && trace->show_duration)
fprintf(trace->output, "( ): ");
if (thread)
trace__fprintf_comm_tid(trace, thread, trace->output);
if (evsel == trace->syscalls.events.bpf_output) {
int id = perf_evsel__sc_tp_uint(evsel, id, sample);
struct syscall *sc = trace__syscall_info(trace, evsel, id);
if (sc) {
fprintf(trace->output, "%s(", sc->name);
trace__fprintf_sys_enter(trace, evsel, sample);
fputc(')', trace->output);
goto newline;
}
/*
* XXX: Not having the associated syscall info or not finding/adding
* the thread should never happen, but if it does...
* fall thru and print it as a bpf_output event.
*/
}
fprintf(trace->output, "%s(", evsel->name);
if (evsel__is_bpf_output(evsel)) {
bpf_output__fprintf(trace, sample);
} else if (evsel->tp_format) {
if (strncmp(evsel->tp_format->name, "sys_enter_", 10) ||
trace__fprintf_sys_enter(trace, evsel, sample)) {
if (trace->libtraceevent_print) {
event_format__fprintf(evsel->tp_format, sample->cpu,
sample->raw_data, sample->raw_size,
trace->output);
} else {
trace__fprintf_tp_fields(trace, evsel, sample, thread, NULL, 0);
}
}
}
newline:
fprintf(trace->output, ")\n");
if (callchain_ret > 0)
trace__fprintf_callchain(trace, sample);
else if (callchain_ret < 0)
pr_err("Problem processing %s callchain, skipping...\n", evsel__name(evsel));
++trace->nr_events_printed;
if (evsel->max_events != ULONG_MAX && ++evsel->nr_events_printed == evsel->max_events) {
evsel__disable(evsel);
evsel__close(evsel);
}
out:
thread__put(thread);
return 0;
}
static void print_location(FILE *f, struct perf_sample *sample,
struct addr_location *al,
bool print_dso, bool print_sym)
{
if ((verbose > 0 || print_dso) && al->map)
fprintf(f, "%s@", dso__long_name(map__dso(al->map)));
if ((verbose > 0 || print_sym) && al->sym)
fprintf(f, "%s+0x%" PRIx64, al->sym->name,
al->addr - al->sym->start);
else if (al->map)
fprintf(f, "0x%" PRIx64, al->addr);
else
fprintf(f, "0x%" PRIx64, sample->addr);
}
static int trace__pgfault(struct trace *trace,
struct evsel *evsel,
union perf_event *event __maybe_unused,
struct perf_sample *sample)
{
struct thread *thread;
struct addr_location al;
char map_type = 'd';
struct thread_trace *ttrace;
int err = -1;
int callchain_ret = 0;
addr_location__init(&al);
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
if (sample->callchain) {
struct callchain_cursor *cursor = get_tls_callchain_cursor();
callchain_ret = trace__resolve_callchain(trace, evsel, sample, cursor);
if (callchain_ret == 0) {
if (cursor->nr < trace->min_stack)
goto out_put;
callchain_ret = 1;
}
}
ttrace = thread__trace(thread, trace->output);
if (ttrace == NULL)
goto out_put;
if (evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ)
ttrace->pfmaj++;
else
ttrace->pfmin++;
if (trace->summary_only)
goto out;
thread__find_symbol(thread, sample->cpumode, sample->ip, &al);
trace__fprintf_entry_head(trace, thread, 0, true, sample->time, trace->output);
fprintf(trace->output, "%sfault [",
evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ?
"maj" : "min");
print_location(trace->output, sample, &al, false, true);
fprintf(trace->output, "] => ");
thread__find_symbol(thread, sample->cpumode, sample->addr, &al);
if (!al.map) {
thread__find_symbol(thread, sample->cpumode, sample->addr, &al);
if (al.map)
map_type = 'x';
else
map_type = '?';
}
print_location(trace->output, sample, &al, true, false);
fprintf(trace->output, " (%c%c)\n", map_type, al.level);
if (callchain_ret > 0)
trace__fprintf_callchain(trace, sample);
else if (callchain_ret < 0)
pr_err("Problem processing %s callchain, skipping...\n", evsel__name(evsel));
++trace->nr_events_printed;
out:
err = 0;
out_put:
thread__put(thread);
addr_location__exit(&al);
return err;
}
static void trace__set_base_time(struct trace *trace,
struct evsel *evsel,
struct perf_sample *sample)
{
/*
* BPF events were not setting PERF_SAMPLE_TIME, so be more robust
* and don't use sample->time unconditionally, we may end up having
* some other event in the future without PERF_SAMPLE_TIME for good
* reason, i.e. we may not be interested in its timestamps, just in
* it taking place, picking some piece of information when it
* appears in our event stream (vfs_getname comes to mind).
*/
if (trace->base_time == 0 && !trace->full_time &&
(evsel->core.attr.sample_type & PERF_SAMPLE_TIME))
trace->base_time = sample->time;
}
static int trace__process_sample(const struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct evsel *evsel,
struct machine *machine __maybe_unused)
{
struct trace *trace = container_of(tool, struct trace, tool);
struct thread *thread;
int err = 0;
tracepoint_handler handler = evsel->handler;
thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
if (thread && thread__is_filtered(thread))
goto out;
trace__set_base_time(trace, evsel, sample);
if (handler) {
++trace->nr_events;
handler(trace, evsel, event, sample);
}
out:
thread__put(thread);
return err;
}
static int trace__record(struct trace *trace, int argc, const char **argv)
{
unsigned int rec_argc, i, j;
const char **rec_argv;
const char * const record_args[] = {
"record",
"-R",
"-m", "1024",
"-c", "1",
};
pid_t pid = getpid();
char *filter = asprintf__tp_filter_pids(1, &pid);
const char * const sc_args[] = { "-e", };
unsigned int sc_args_nr = ARRAY_SIZE(sc_args);
const char * const majpf_args[] = { "-e", "major-faults" };
unsigned int majpf_args_nr = ARRAY_SIZE(majpf_args);
const char * const minpf_args[] = { "-e", "minor-faults" };
unsigned int minpf_args_nr = ARRAY_SIZE(minpf_args);
int err = -1;
/* +3 is for the event string below and the pid filter */
rec_argc = ARRAY_SIZE(record_args) + sc_args_nr + 3 +
majpf_args_nr + minpf_args_nr + argc;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
if (rec_argv == NULL || filter == NULL)
goto out_free;
j = 0;
for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[j++] = record_args[i];
if (trace->trace_syscalls) {
for (i = 0; i < sc_args_nr; i++)
rec_argv[j++] = sc_args[i];
/* event string may be different for older kernels - e.g., RHEL6 */
if (is_valid_tracepoint("raw_syscalls:sys_enter"))
rec_argv[j++] = "raw_syscalls:sys_enter,raw_syscalls:sys_exit";
else if (is_valid_tracepoint("syscalls:sys_enter"))
rec_argv[j++] = "syscalls:sys_enter,syscalls:sys_exit";
else {
pr_err("Neither raw_syscalls nor syscalls events exist.\n");
goto out_free;
}
}
rec_argv[j++] = "--filter";
rec_argv[j++] = filter;
if (trace->trace_pgfaults & TRACE_PFMAJ)
for (i = 0; i < majpf_args_nr; i++)
rec_argv[j++] = majpf_args[i];
if (trace->trace_pgfaults & TRACE_PFMIN)
for (i = 0; i < minpf_args_nr; i++)
rec_argv[j++] = minpf_args[i];
for (i = 0; i < (unsigned int)argc; i++)
rec_argv[j++] = argv[i];
err = cmd_record(j, rec_argv);
out_free:
free(filter);
free(rec_argv);
return err;
}
static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);
static bool evlist__add_vfs_getname(struct evlist *evlist)
{
bool found = false;
struct evsel *evsel, *tmp;
struct parse_events_error err;
int ret;
parse_events_error__init(&err);
ret = parse_events(evlist, "probe:vfs_getname*", &err);
parse_events_error__exit(&err);
if (ret)
return false;
evlist__for_each_entry_safe(evlist, evsel, tmp) {
if (!strstarts(evsel__name(evsel), "probe:vfs_getname"))
continue;
if (evsel__field(evsel, "pathname")) {
evsel->handler = trace__vfs_getname;
found = true;
continue;
}
list_del_init(&evsel->core.node);
evsel->evlist = NULL;
evsel__delete(evsel);
}
return found;
}
static struct evsel *evsel__new_pgfault(u64 config)
{
struct evsel *evsel;
struct perf_event_attr attr = {
.type = PERF_TYPE_SOFTWARE,
.mmap_data = 1,
};
attr.config = config;
attr.sample_period = 1;
event_attr_init(&attr);
evsel = evsel__new(&attr);
if (evsel)
evsel->handler = trace__pgfault;
return evsel;
}
static void evlist__free_syscall_tp_fields(struct evlist *evlist)
{
struct evsel *evsel;
evlist__for_each_entry(evlist, evsel) {
evsel_trace__delete(evsel->priv);
evsel->priv = NULL;
}
}
static void trace__handle_event(struct trace *trace, union perf_event *event, struct perf_sample *sample)
{
const u32 type = event->header.type;
struct evsel *evsel;
if (type != PERF_RECORD_SAMPLE) {
trace__process_event(trace, trace->host, event, sample);
return;
}
evsel = evlist__id2evsel(trace->evlist, sample->id);
if (evsel == NULL) {
fprintf(trace->output, "Unknown tp ID %" PRIu64 ", skipping...\n", sample->id);
return;
}
if (evswitch__discard(&trace->evswitch, evsel))
return;
trace__set_base_time(trace, evsel, sample);
if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&
sample->raw_data == NULL) {
fprintf(trace->output, "%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
evsel__name(evsel), sample->tid,
sample->cpu, sample->raw_size);
} else {
tracepoint_handler handler = evsel->handler;
handler(trace, evsel, event, sample);
}
if (trace->nr_events_printed >= trace->max_events && trace->max_events != ULONG_MAX)
interrupted = true;
}
static int trace__add_syscall_newtp(struct trace *trace)
{
int ret = -1;
struct evlist *evlist = trace->evlist;
struct evsel *sys_enter, *sys_exit;
sys_enter = perf_evsel__raw_syscall_newtp("sys_enter", trace__sys_enter);
if (sys_enter == NULL)
goto out;
if (perf_evsel__init_sc_tp_ptr_field(sys_enter, args))
goto out_delete_sys_enter;
sys_exit = perf_evsel__raw_syscall_newtp("sys_exit", trace__sys_exit);
if (sys_exit == NULL)
goto out_delete_sys_enter;
if (perf_evsel__init_sc_tp_uint_field(sys_exit, ret))
goto out_delete_sys_exit;
evsel__config_callchain(sys_enter, &trace->opts, &callchain_param);
evsel__config_callchain(sys_exit, &trace->opts, &callchain_param);
evlist__add(evlist, sys_enter);
evlist__add(evlist, sys_exit);
if (callchain_param.enabled && !trace->kernel_syscallchains) {
/*
* We're interested only in the user space callchain
* leading to the syscall, allow overriding that for
* debugging reasons using --kernel_syscall_callchains
*/
sys_exit->core.attr.exclude_callchain_kernel = 1;
}
trace->syscalls.events.sys_enter = sys_enter;
trace->syscalls.events.sys_exit = sys_exit;
ret = 0;
out:
return ret;
out_delete_sys_exit:
evsel__delete_priv(sys_exit);
out_delete_sys_enter:
evsel__delete_priv(sys_enter);
goto out;
}
static int trace__set_ev_qualifier_tp_filter(struct trace *trace)
{
int err = -1;
struct evsel *sys_exit;
char *filter = asprintf_expr_inout_ints("id", !trace->not_ev_qualifier,
trace->ev_qualifier_ids.nr,
trace->ev_qualifier_ids.entries);
if (filter == NULL)
goto out_enomem;
if (!evsel__append_tp_filter(trace->syscalls.events.sys_enter, filter)) {
sys_exit = trace->syscalls.events.sys_exit;
err = evsel__append_tp_filter(sys_exit, filter);
}
free(filter);
out:
return err;
out_enomem:
errno = ENOMEM;
goto out;
}
#ifdef HAVE_BPF_SKEL
static int syscall_arg_fmt__cache_btf_struct(struct syscall_arg_fmt *arg_fmt, struct btf *btf, char *type)
{
int id;
if (arg_fmt->type != NULL)
return -1;
id = btf__find_by_name(btf, type);
if (id < 0)
return -1;
arg_fmt->type = btf__type_by_id(btf, id);
arg_fmt->type_id = id;
return 0;
}
static struct bpf_program *trace__find_bpf_program_by_title(struct trace *trace, const char *name)
{
struct bpf_program *pos, *prog = NULL;
const char *sec_name;
if (trace->skel->obj == NULL)
return NULL;
bpf_object__for_each_program(pos, trace->skel->obj) {
sec_name = bpf_program__section_name(pos);
if (sec_name && !strcmp(sec_name, name)) {
prog = pos;
break;
}
}
return prog;
}
static struct bpf_program *trace__find_syscall_bpf_prog(struct trace *trace, struct syscall *sc,
const char *prog_name, const char *type)
{
struct bpf_program *prog;
if (prog_name == NULL) {
char default_prog_name[256];
scnprintf(default_prog_name, sizeof(default_prog_name), "tp/syscalls/sys_%s_%s", type, sc->name);
prog = trace__find_bpf_program_by_title(trace, default_prog_name);
if (prog != NULL)
goto out_found;
if (sc->fmt && sc->fmt->alias) {
scnprintf(default_prog_name, sizeof(default_prog_name), "tp/syscalls/sys_%s_%s", type, sc->fmt->alias);
prog = trace__find_bpf_program_by_title(trace, default_prog_name);
if (prog != NULL)
goto out_found;
}
goto out_unaugmented;
}
prog = trace__find_bpf_program_by_title(trace, prog_name);
if (prog != NULL) {
out_found:
return prog;
}
pr_debug("Couldn't find BPF prog \"%s\" to associate with syscalls:sys_%s_%s, not augmenting it\n",
prog_name, type, sc->name);
out_unaugmented:
return trace->skel->progs.syscall_unaugmented;
}
static void trace__init_syscall_bpf_progs(struct trace *trace, int id)
{
struct syscall *sc = trace__syscall_info(trace, NULL, id);
if (sc == NULL)
return;
sc->bpf_prog.sys_enter = trace__find_syscall_bpf_prog(trace, sc, sc->fmt ? sc->fmt->bpf_prog_name.sys_enter : NULL, "enter");
sc->bpf_prog.sys_exit = trace__find_syscall_bpf_prog(trace, sc, sc->fmt ? sc->fmt->bpf_prog_name.sys_exit : NULL, "exit");
}
static int trace__bpf_prog_sys_enter_fd(struct trace *trace, int id)
{
struct syscall *sc = trace__syscall_info(trace, NULL, id);
return sc ? bpf_program__fd(sc->bpf_prog.sys_enter) : bpf_program__fd(trace->skel->progs.syscall_unaugmented);
}
static int trace__bpf_prog_sys_exit_fd(struct trace *trace, int id)
{
struct syscall *sc = trace__syscall_info(trace, NULL, id);
return sc ? bpf_program__fd(sc->bpf_prog.sys_exit) : bpf_program__fd(trace->skel->progs.syscall_unaugmented);
}
static int trace__bpf_sys_enter_beauty_map(struct trace *trace, int key, unsigned int *beauty_array)
{
struct tep_format_field *field;
struct syscall *sc = trace__syscall_info(trace, NULL, key);
const struct btf_type *bt;
char *struct_offset, *tmp, name[32];
bool can_augment = false;
int i, cnt;
if (sc == NULL)
return -1;
trace__load_vmlinux_btf(trace);
if (trace->btf == NULL)
return -1;
for (i = 0, field = sc->args; field; ++i, field = field->next) {
// XXX We're only collecting pointer payloads _from_ user space
if (!sc->arg_fmt[i].from_user)
continue;
struct_offset = strstr(field->type, "struct ");
if (struct_offset == NULL)
struct_offset = strstr(field->type, "union ");
else
struct_offset++; // "union" is shorter
if (field->flags & TEP_FIELD_IS_POINTER && struct_offset) { /* struct or union (think BPF's attr arg) */
struct_offset += 6;
/* for 'struct foo *', we only want 'foo' */
for (tmp = struct_offset, cnt = 0; *tmp != ' ' && *tmp != '\0'; ++tmp, ++cnt) {
}
strncpy(name, struct_offset, cnt);
name[cnt] = '\0';
/* cache struct's btf_type and type_id */
if (syscall_arg_fmt__cache_btf_struct(&sc->arg_fmt[i], trace->btf, name))
continue;
bt = sc->arg_fmt[i].type;
beauty_array[i] = bt->size;
can_augment = true;
} else if (field->flags & TEP_FIELD_IS_POINTER && /* string */
strcmp(field->type, "const char *") == 0 &&
(strstr(field->name, "name") ||
strstr(field->name, "path") ||
strstr(field->name, "file") ||
strstr(field->name, "root") ||
strstr(field->name, "key") ||
strstr(field->name, "special") ||
strstr(field->name, "type") ||
strstr(field->name, "description"))) {
beauty_array[i] = 1;
can_augment = true;
} else if (field->flags & TEP_FIELD_IS_POINTER && /* buffer */
strstr(field->type, "char *") &&
(strstr(field->name, "buf") ||
strstr(field->name, "val") ||
strstr(field->name, "msg"))) {
int j;
struct tep_format_field *field_tmp;
/* find the size of the buffer that appears in pairs with buf */
for (j = 0, field_tmp = sc->args; field_tmp; ++j, field_tmp = field_tmp->next) {
if (!(field_tmp->flags & TEP_FIELD_IS_POINTER) && /* only integers */
(strstr(field_tmp->name, "count") ||
strstr(field_tmp->name, "siz") || /* size, bufsiz */
(strstr(field_tmp->name, "len") && strcmp(field_tmp->name, "filename")))) {
/* filename's got 'len' in it, we don't want that */
beauty_array[i] = -(j + 1);
can_augment = true;
break;
}
}
}
}
if (can_augment)
return 0;
return -1;
}
static struct bpf_program *trace__find_usable_bpf_prog_entry(struct trace *trace, struct syscall *sc)
{
struct tep_format_field *field, *candidate_field;
/*
* We're only interested in syscalls that have a pointer:
*/
for (field = sc->args; field; field = field->next) {
if (field->flags & TEP_FIELD_IS_POINTER)
goto try_to_find_pair;
}
return NULL;
try_to_find_pair:
for (int i = 0; i < trace->sctbl->syscalls.nr_entries; ++i) {
int id = syscalltbl__id_at_idx(trace->sctbl, i);
struct syscall *pair = trace__syscall_info(trace, NULL, id);
struct bpf_program *pair_prog;
bool is_candidate = false;
if (pair == NULL || pair == sc ||
pair->bpf_prog.sys_enter == trace->skel->progs.syscall_unaugmented)
continue;
for (field = sc->args, candidate_field = pair->args;
field && candidate_field; field = field->next, candidate_field = candidate_field->next) {
bool is_pointer = field->flags & TEP_FIELD_IS_POINTER,
candidate_is_pointer = candidate_field->flags & TEP_FIELD_IS_POINTER;
if (is_pointer) {
if (!candidate_is_pointer) {
// The candidate just doesn't copies our pointer arg, might copy other pointers we want.
continue;
}
} else {
if (candidate_is_pointer) {
// The candidate might copy a pointer we don't have, skip it.
goto next_candidate;
}
continue;
}
if (strcmp(field->type, candidate_field->type))
goto next_candidate;
/*
* This is limited in the BPF program but sys_write
* uses "const char *" for its "buf" arg so we need to
* use some heuristic that is kinda future proof...
*/
if (strcmp(field->type, "const char *") == 0 &&
!(strstr(field->name, "name") ||
strstr(field->name, "path") ||
strstr(field->name, "file") ||
strstr(field->name, "root") ||
strstr(field->name, "description")))
goto next_candidate;
is_candidate = true;
}
if (!is_candidate)
goto next_candidate;
/*
* Check if the tentative pair syscall augmenter has more pointers, if it has,
* then it may be collecting that and we then can't use it, as it would collect
* more than what is common to the two syscalls.
*/
if (candidate_field) {
for (candidate_field = candidate_field->next; candidate_field; candidate_field = candidate_field->next)
if (candidate_field->flags & TEP_FIELD_IS_POINTER)
goto next_candidate;
}
pair_prog = pair->bpf_prog.sys_enter;
/*
* If the pair isn't enabled, then its bpf_prog.sys_enter will not
* have been searched for, so search it here and if it returns the
* unaugmented one, then ignore it, otherwise we'll reuse that BPF
* program for a filtered syscall on a non-filtered one.
*
* For instance, we have "!syscalls:sys_enter_renameat" and that is
* useful for "renameat2".
*/
if (pair_prog == NULL) {
pair_prog = trace__find_syscall_bpf_prog(trace, pair, pair->fmt ? pair->fmt->bpf_prog_name.sys_enter : NULL, "enter");
if (pair_prog == trace->skel->progs.syscall_unaugmented)
goto next_candidate;
}
pr_debug("Reusing \"%s\" BPF sys_enter augmenter for \"%s\"\n", pair->name, sc->name);
return pair_prog;
next_candidate:
continue;
}
return NULL;
}
static int trace__init_syscalls_bpf_prog_array_maps(struct trace *trace)
{
int map_enter_fd = bpf_map__fd(trace->skel->maps.syscalls_sys_enter);
int map_exit_fd = bpf_map__fd(trace->skel->maps.syscalls_sys_exit);
int beauty_map_fd = bpf_map__fd(trace->skel->maps.beauty_map_enter);
int err = 0;
unsigned int beauty_array[6];
for (int i = 0; i < trace->sctbl->syscalls.nr_entries; ++i) {
int prog_fd, key = syscalltbl__id_at_idx(trace->sctbl, i);
if (!trace__syscall_enabled(trace, key))
continue;
trace__init_syscall_bpf_progs(trace, key);
// It'll get at least the "!raw_syscalls:unaugmented"
prog_fd = trace__bpf_prog_sys_enter_fd(trace, key);
err = bpf_map_update_elem(map_enter_fd, &key, &prog_fd, BPF_ANY);
if (err)
break;
prog_fd = trace__bpf_prog_sys_exit_fd(trace, key);
err = bpf_map_update_elem(map_exit_fd, &key, &prog_fd, BPF_ANY);
if (err)
break;
/* use beauty_map to tell BPF how many bytes to collect, set beauty_map's value here */
memset(beauty_array, 0, sizeof(beauty_array));
err = trace__bpf_sys_enter_beauty_map(trace, key, (unsigned int *)beauty_array);
if (err)
continue;
err = bpf_map_update_elem(beauty_map_fd, &key, beauty_array, BPF_ANY);
if (err)
break;
}
/*
* Now lets do a second pass looking for enabled syscalls without
* an augmenter that have a signature that is a superset of another
* syscall with an augmenter so that we can auto-reuse it.
*
* I.e. if we have an augmenter for the "open" syscall that has
* this signature:
*
* int open(const char *pathname, int flags, mode_t mode);
*
* I.e. that will collect just the first string argument, then we
* can reuse it for the 'creat' syscall, that has this signature:
*
* int creat(const char *pathname, mode_t mode);
*
* and for:
*
* int stat(const char *pathname, struct stat *statbuf);
* int lstat(const char *pathname, struct stat *statbuf);
*
* Because the 'open' augmenter will collect the first arg as a string,
* and leave alone all the other args, which already helps with
* beautifying 'stat' and 'lstat''s pathname arg.
*
* Then, in time, when 'stat' gets an augmenter that collects both
* first and second arg (this one on the raw_syscalls:sys_exit prog
* array tail call, then that one will be used.
*/
for (int i = 0; i < trace->sctbl->syscalls.nr_entries; ++i) {
int key = syscalltbl__id_at_idx(trace->sctbl, i);
struct syscall *sc = trace__syscall_info(trace, NULL, key);
struct bpf_program *pair_prog;
int prog_fd;
if (sc == NULL || sc->bpf_prog.sys_enter == NULL)
continue;
/*
* For now we're just reusing the sys_enter prog, and if it
* already has an augmenter, we don't need to find one.
*/
if (sc->bpf_prog.sys_enter != trace->skel->progs.syscall_unaugmented)
continue;
/*
* Look at all the other syscalls for one that has a signature
* that is close enough that we can share:
*/
pair_prog = trace__find_usable_bpf_prog_entry(trace, sc);
if (pair_prog == NULL)
continue;
sc->bpf_prog.sys_enter = pair_prog;
/*
* Update the BPF_MAP_TYPE_PROG_SHARED for raw_syscalls:sys_enter
* with the fd for the program we're reusing:
*/
prog_fd = bpf_program__fd(sc->bpf_prog.sys_enter);
err = bpf_map_update_elem(map_enter_fd, &key, &prog_fd, BPF_ANY);
if (err)
break;
}
return err;
}
#endif // HAVE_BPF_SKEL
static int trace__set_ev_qualifier_filter(struct trace *trace)
{
if (trace->syscalls.events.sys_enter)
return trace__set_ev_qualifier_tp_filter(trace);
return 0;
}
static int bpf_map__set_filter_pids(struct bpf_map *map __maybe_unused,
size_t npids __maybe_unused, pid_t *pids __maybe_unused)
{
int err = 0;
#ifdef HAVE_LIBBPF_SUPPORT
bool value = true;
int map_fd = bpf_map__fd(map);
size_t i;
for (i = 0; i < npids; ++i) {
err = bpf_map_update_elem(map_fd, &pids[i], &value, BPF_ANY);
if (err)
break;
}
#endif
return err;
}
static int trace__set_filter_loop_pids(struct trace *trace)
{
unsigned int nr = 1, err;
pid_t pids[32] = {
getpid(),
};
struct thread *thread = machine__find_thread(trace->host, pids[0], pids[0]);
while (thread && nr < ARRAY_SIZE(pids)) {
struct thread *parent = machine__find_thread(trace->host,
thread__ppid(thread),
thread__ppid(thread));
if (parent == NULL)
break;
if (!strcmp(thread__comm_str(parent), "sshd") ||
strstarts(thread__comm_str(parent), "gnome-terminal")) {
pids[nr++] = thread__tid(parent);
break;
}
thread = parent;
}
err = evlist__append_tp_filter_pids(trace->evlist, nr, pids);
if (!err && trace->filter_pids.map)
err = bpf_map__set_filter_pids(trace->filter_pids.map, nr, pids);
return err;
}
static int trace__set_filter_pids(struct trace *trace)
{
int err = 0;
/*
* Better not use !target__has_task() here because we need to cover the
* case where no threads were specified in the command line, but a
* workload was, and in that case we will fill in the thread_map when
* we fork the workload in evlist__prepare_workload.
*/
if (trace->filter_pids.nr > 0) {
err = evlist__append_tp_filter_pids(trace->evlist, trace->filter_pids.nr,
trace->filter_pids.entries);
if (!err && trace->filter_pids.map) {
err = bpf_map__set_filter_pids(trace->filter_pids.map, trace->filter_pids.nr,
trace->filter_pids.entries);
}
} else if (perf_thread_map__pid(trace->evlist->core.threads, 0) == -1) {
err = trace__set_filter_loop_pids(trace);
}
return err;
}
static int __trace__deliver_event(struct trace *trace, union perf_event *event)
{
struct evlist *evlist = trace->evlist;
struct perf_sample sample;
int err = evlist__parse_sample(evlist, event, &sample);
if (err)
fprintf(trace->output, "Can't parse sample, err = %d, skipping...\n", err);
else
trace__handle_event(trace, event, &sample);
return 0;
}
static int __trace__flush_events(struct trace *trace)
{
u64 first = ordered_events__first_time(&trace->oe.data);
u64 flush = trace->oe.last - NSEC_PER_SEC;
/* Is there some thing to flush.. */
if (first && first < flush)
return ordered_events__flush_time(&trace->oe.data, flush);
return 0;
}
static int trace__flush_events(struct trace *trace)
{
return !trace->sort_events ? 0 : __trace__flush_events(trace);
}
static int trace__deliver_event(struct trace *trace, union perf_event *event)
{
int err;
if (!trace->sort_events)
return __trace__deliver_event(trace, event);
err = evlist__parse_sample_timestamp(trace->evlist, event, &trace->oe.last);
if (err && err != -1)
return err;
err = ordered_events__queue(&trace->oe.data, event, trace->oe.last, 0, NULL);
if (err)
return err;
return trace__flush_events(trace);
}
static int ordered_events__deliver_event(struct ordered_events *oe,
struct ordered_event *event)
{
struct trace *trace = container_of(oe, struct trace, oe.data);
return __trace__deliver_event(trace, event->event);
}
static struct syscall_arg_fmt *evsel__find_syscall_arg_fmt_by_name(struct evsel *evsel, char *arg,
char **type)
{
struct tep_format_field *field;
struct syscall_arg_fmt *fmt = __evsel__syscall_arg_fmt(evsel);
if (evsel->tp_format == NULL || fmt == NULL)
return NULL;
for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt)
if (strcmp(field->name, arg) == 0) {
*type = field->type;
return fmt;
}
return NULL;
}
static int trace__expand_filter(struct trace *trace, struct evsel *evsel)
{
char *tok, *left = evsel->filter, *new_filter = evsel->filter;
while ((tok = strpbrk(left, "=<>!")) != NULL) {
char *right = tok + 1, *right_end;
if (*right == '=')
++right;
while (isspace(*right))
++right;
if (*right == '\0')
break;
while (!isalpha(*left))
if (++left == tok) {
/*
* Bail out, can't find the name of the argument that is being
* used in the filter, let it try to set this filter, will fail later.
*/
return 0;
}
right_end = right + 1;
while (isalnum(*right_end) || *right_end == '_' || *right_end == '|')
++right_end;
if (isalpha(*right)) {
struct syscall_arg_fmt *fmt;
int left_size = tok - left,
right_size = right_end - right;
char arg[128], *type;
while (isspace(left[left_size - 1]))
--left_size;
scnprintf(arg, sizeof(arg), "%.*s", left_size, left);
fmt = evsel__find_syscall_arg_fmt_by_name(evsel, arg, &type);
if (fmt == NULL) {
pr_err("\"%s\" not found in \"%s\", can't set filter \"%s\"\n",
arg, evsel->name, evsel->filter);
return -1;
}
pr_debug2("trying to expand \"%s\" \"%.*s\" \"%.*s\" -> ",
arg, (int)(right - tok), tok, right_size, right);
if (fmt->strtoul) {
u64 val;
struct syscall_arg syscall_arg = {
.trace = trace,
.fmt = fmt,
.type_name = type,
.parm = fmt->parm,
};
if (fmt->strtoul(right, right_size, &syscall_arg, &val)) {
char *n, expansion[19];
int expansion_lenght = scnprintf(expansion, sizeof(expansion), "%#" PRIx64, val);
int expansion_offset = right - new_filter;
pr_debug("%s", expansion);
if (asprintf(&n, "%.*s%s%s", expansion_offset, new_filter, expansion, right_end) < 0) {
pr_debug(" out of memory!\n");
free(new_filter);
return -1;
}
if (new_filter != evsel->filter)
free(new_filter);
left = n + expansion_offset + expansion_lenght;
new_filter = n;
} else {
pr_err("\"%.*s\" not found for \"%s\" in \"%s\", can't set filter \"%s\"\n",
right_size, right, arg, evsel->name, evsel->filter);
return -1;
}
} else {
pr_err("No resolver (strtoul) for \"%s\" in \"%s\", can't set filter \"%s\"\n",
arg, evsel->name, evsel->filter);
return -1;
}
pr_debug("\n");
} else {
left = right_end;
}
}
if (new_filter != evsel->filter) {
pr_debug("New filter for %s: %s\n", evsel->name, new_filter);
evsel__set_filter(evsel, new_filter);
free(new_filter);
}
return 0;
}
static int trace__expand_filters(struct trace *trace, struct evsel **err_evsel)
{
struct evlist *evlist = trace->evlist;
struct evsel *evsel;
evlist__for_each_entry(evlist, evsel) {
if (evsel->filter == NULL)
continue;
if (trace__expand_filter(trace, evsel)) {
*err_evsel = evsel;
return -1;
}
}
return 0;
}
static int trace__run(struct trace *trace, int argc, const char **argv)
{
struct evlist *evlist = trace->evlist;
struct evsel *evsel, *pgfault_maj = NULL, *pgfault_min = NULL;
int err = -1, i;
unsigned long before;
const bool forks = argc > 0;
bool draining = false;
trace->live = true;
if (!trace->raw_augmented_syscalls) {
if (trace->trace_syscalls && trace__add_syscall_newtp(trace))
goto out_error_raw_syscalls;
if (trace->trace_syscalls)
trace->vfs_getname = evlist__add_vfs_getname(evlist);
}
if ((trace->trace_pgfaults & TRACE_PFMAJ)) {
pgfault_maj = evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MAJ);
if (pgfault_maj == NULL)
goto out_error_mem;
evsel__config_callchain(pgfault_maj, &trace->opts, &callchain_param);
evlist__add(evlist, pgfault_maj);
}
if ((trace->trace_pgfaults & TRACE_PFMIN)) {
pgfault_min = evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MIN);
if (pgfault_min == NULL)
goto out_error_mem;
evsel__config_callchain(pgfault_min, &trace->opts, &callchain_param);
evlist__add(evlist, pgfault_min);
}
/* Enable ignoring missing threads when -u/-p option is defined. */
trace->opts.ignore_missing_thread = trace->opts.target.uid != UINT_MAX || trace->opts.target.pid;
if (trace->sched &&
evlist__add_newtp(evlist, "sched", "sched_stat_runtime", trace__sched_stat_runtime))
goto out_error_sched_stat_runtime;
/*
* If a global cgroup was set, apply it to all the events without an
* explicit cgroup. I.e.:
*
* trace -G A -e sched:*switch
*
* Will set all raw_syscalls:sys_{enter,exit}, pgfault, vfs_getname, etc
* _and_ sched:sched_switch to the 'A' cgroup, while:
*
* trace -e sched:*switch -G A
*
* will only set the sched:sched_switch event to the 'A' cgroup, all the
* other events (raw_syscalls:sys_{enter,exit}, etc are left "without"
* a cgroup (on the root cgroup, sys wide, etc).
*
* Multiple cgroups:
*
* trace -G A -e sched:*switch -G B
*
* the syscall ones go to the 'A' cgroup, the sched:sched_switch goes
* to the 'B' cgroup.
*
* evlist__set_default_cgroup() grabs a reference of the passed cgroup
* only for the evsels still without a cgroup, i.e. evsel->cgroup == NULL.
*/
if (trace->cgroup)
evlist__set_default_cgroup(trace->evlist, trace->cgroup);
err = evlist__create_maps(evlist, &trace->opts.target);
if (err < 0) {
fprintf(trace->output, "Problems parsing the target to trace, check your options!\n");
goto out_delete_evlist;
}
err = trace__symbols_init(trace, evlist);
if (err < 0) {
fprintf(trace->output, "Problems initializing symbol libraries!\n");
goto out_delete_evlist;
}
evlist__config(evlist, &trace->opts, &callchain_param);
if (forks) {
err = evlist__prepare_workload(evlist, &trace->opts.target, argv, false, NULL);
if (err < 0) {
fprintf(trace->output, "Couldn't run the workload!\n");
goto out_delete_evlist;
}
workload_pid = evlist->workload.pid;
}
err = evlist__open(evlist);
if (err < 0)
goto out_error_open;
#ifdef HAVE_BPF_SKEL
if (trace->syscalls.events.bpf_output) {
struct perf_cpu cpu;
/*
* Set up the __augmented_syscalls__ BPF map to hold for each
* CPU the bpf-output event's file descriptor.
*/
perf_cpu_map__for_each_cpu(cpu, i, trace->syscalls.events.bpf_output->core.cpus) {
bpf_map__update_elem(trace->skel->maps.__augmented_syscalls__,
&cpu.cpu, sizeof(int),
xyarray__entry(trace->syscalls.events.bpf_output->core.fd,
cpu.cpu, 0),
sizeof(__u32), BPF_ANY);
}
}
#endif
err = trace__set_filter_pids(trace);
if (err < 0)
goto out_error_mem;
#ifdef HAVE_BPF_SKEL
if (trace->skel && trace->skel->progs.sys_enter)
trace__init_syscalls_bpf_prog_array_maps(trace);
#endif
if (trace->ev_qualifier_ids.nr > 0) {
err = trace__set_ev_qualifier_filter(trace);
if (err < 0)
goto out_errno;
if (trace->syscalls.events.sys_exit) {
pr_debug("event qualifier tracepoint filter: %s\n",
trace->syscalls.events.sys_exit->filter);
}
}
/*
* If the "close" syscall is not traced, then we will not have the
* opportunity to, in syscall_arg__scnprintf_close_fd() invalidate the
* fd->pathname table and were ending up showing the last value set by
* syscalls opening a pathname and associating it with a descriptor or
* reading it from /proc/pid/fd/ in cases where that doesn't make
* sense.
*
* So just disable this beautifier (SCA_FD, SCA_FDAT) when 'close' is
* not in use.
*/
trace->fd_path_disabled = !trace__syscall_enabled(trace, syscalltbl__id(trace->sctbl, "close"));
err = trace__expand_filters(trace, &evsel);
if (err)
goto out_delete_evlist;
err = evlist__apply_filters(evlist, &evsel, &trace->opts.target);
if (err < 0)
goto out_error_apply_filters;
err = evlist__mmap(evlist, trace->opts.mmap_pages);
if (err < 0)
goto out_error_mmap;
if (!target__none(&trace->opts.target) && !trace->opts.target.initial_delay)
evlist__enable(evlist);
if (forks)
evlist__start_workload(evlist);
if (trace->opts.target.initial_delay) {
usleep(trace->opts.target.initial_delay * 1000);
evlist__enable(evlist);
}
trace->multiple_threads = perf_thread_map__pid(evlist->core.threads, 0) == -1 ||
perf_thread_map__nr(evlist->core.threads) > 1 ||
evlist__first(evlist)->core.attr.inherit;
/*
* Now that we already used evsel->core.attr to ask the kernel to setup the
* events, lets reuse evsel->core.attr.sample_max_stack as the limit in
* trace__resolve_callchain(), allowing per-event max-stack settings
* to override an explicitly set --max-stack global setting.
*/
evlist__for_each_entry(evlist, evsel) {
if (evsel__has_callchain(evsel) &&
evsel->core.attr.sample_max_stack == 0)
evsel->core.attr.sample_max_stack = trace->max_stack;
}
again:
before = trace->nr_events;
for (i = 0; i < evlist->core.nr_mmaps; i++) {
union perf_event *event;
struct mmap *md;
md = &evlist->mmap[i];
if (perf_mmap__read_init(&md->core) < 0)
continue;
while ((event = perf_mmap__read_event(&md->core)) != NULL) {
++trace->nr_events;
err = trace__deliver_event(trace, event);
if (err)
goto out_disable;
perf_mmap__consume(&md->core);
if (interrupted)
goto out_disable;
if (done && !draining) {
evlist__disable(evlist);
draining = true;
}
}
perf_mmap__read_done(&md->core);
}
if (trace->nr_events == before) {
int timeout = done ? 100 : -1;
if (!draining && evlist__poll(evlist, timeout) > 0) {
if (evlist__filter_pollfd(evlist, POLLERR | POLLHUP | POLLNVAL) == 0)
draining = true;
goto again;
} else {
if (trace__flush_events(trace))
goto out_disable;
}
} else {
goto again;
}
out_disable:
thread__zput(trace->current);
evlist__disable(evlist);
if (trace->sort_events)
ordered_events__flush(&trace->oe.data, OE_FLUSH__FINAL);
if (!err) {
if (trace->summary)
trace__fprintf_thread_summary(trace, trace->output);
if (trace->show_tool_stats) {
fprintf(trace->output, "Stats:\n "
" vfs_getname : %" PRIu64 "\n"
" proc_getname: %" PRIu64 "\n",
trace->stats.vfs_getname,
trace->stats.proc_getname);
}
}
out_delete_evlist:
trace__symbols__exit(trace);
evlist__free_syscall_tp_fields(evlist);
evlist__delete(evlist);
cgroup__put(trace->cgroup);
trace->evlist = NULL;
trace->live = false;
return err;
{
char errbuf[BUFSIZ];
out_error_sched_stat_runtime:
tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "sched", "sched_stat_runtime");
goto out_error;
out_error_raw_syscalls:
tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "raw_syscalls", "sys_(enter|exit)");
goto out_error;
out_error_mmap:
evlist__strerror_mmap(evlist, errno, errbuf, sizeof(errbuf));
goto out_error;
out_error_open:
evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
out_error:
fprintf(trace->output, "%s\n", errbuf);
goto out_delete_evlist;
out_error_apply_filters:
fprintf(trace->output,
"Failed to set filter \"%s\" on event %s with %d (%s)\n",
evsel->filter, evsel__name(evsel), errno,
str_error_r(errno, errbuf, sizeof(errbuf)));
goto out_delete_evlist;
}
out_error_mem:
fprintf(trace->output, "Not enough memory to run!\n");
goto out_delete_evlist;
out_errno:
fprintf(trace->output, "errno=%d,%s\n", errno, strerror(errno));
goto out_delete_evlist;
}
static int trace__replay(struct trace *trace)
{
const struct evsel_str_handler handlers[] = {
{ "probe:vfs_getname", trace__vfs_getname, },
};
struct perf_data data = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
.force = trace->force,
};
struct perf_session *session;
struct evsel *evsel;
int err = -1;
trace->tool.sample = trace__process_sample;
trace->tool.mmap = perf_event__process_mmap;
trace->tool.mmap2 = perf_event__process_mmap2;
trace->tool.comm = perf_event__process_comm;
trace->tool.exit = perf_event__process_exit;
trace->tool.fork = perf_event__process_fork;
trace->tool.attr = perf_event__process_attr;
trace->tool.tracing_data = perf_event__process_tracing_data;
trace->tool.build_id = perf_event__process_build_id;
trace->tool.namespaces = perf_event__process_namespaces;
trace->tool.ordered_events = true;
trace->tool.ordering_requires_timestamps = true;
/* add tid to output */
trace->multiple_threads = true;
session = perf_session__new(&data, &trace->tool);
if (IS_ERR(session))
return PTR_ERR(session);
if (trace->opts.target.pid)
symbol_conf.pid_list_str = strdup(trace->opts.target.pid);
if (trace->opts.target.tid)
symbol_conf.tid_list_str = strdup(trace->opts.target.tid);
if (symbol__init(&session->header.env) < 0)
goto out;
trace->host = &session->machines.host;
err = perf_session__set_tracepoints_handlers(session, handlers);
if (err)
goto out;
evsel = evlist__find_tracepoint_by_name(session->evlist, "raw_syscalls:sys_enter");
trace->syscalls.events.sys_enter = evsel;
/* older kernels have syscalls tp versus raw_syscalls */
if (evsel == NULL)
evsel = evlist__find_tracepoint_by_name(session->evlist, "syscalls:sys_enter");
if (evsel &&
(evsel__init_raw_syscall_tp(evsel, trace__sys_enter) < 0 ||
perf_evsel__init_sc_tp_ptr_field(evsel, args))) {
pr_err("Error during initialize raw_syscalls:sys_enter event\n");
goto out;
}
evsel = evlist__find_tracepoint_by_name(session->evlist, "raw_syscalls:sys_exit");
trace->syscalls.events.sys_exit = evsel;
if (evsel == NULL)
evsel = evlist__find_tracepoint_by_name(session->evlist, "syscalls:sys_exit");
if (evsel &&
(evsel__init_raw_syscall_tp(evsel, trace__sys_exit) < 0 ||
perf_evsel__init_sc_tp_uint_field(evsel, ret))) {
pr_err("Error during initialize raw_syscalls:sys_exit event\n");
goto out;
}
evlist__for_each_entry(session->evlist, evsel) {
if (evsel->core.attr.type == PERF_TYPE_SOFTWARE &&
(evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ||
evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS))
evsel->handler = trace__pgfault;
}
setup_pager();
err = perf_session__process_events(session);
if (err)
pr_err("Failed to process events, error %d", err);
else if (trace->summary)
trace__fprintf_thread_summary(trace, trace->output);
out:
perf_session__delete(session);
return err;
}
static size_t trace__fprintf_threads_header(FILE *fp)
{
size_t printed;
printed = fprintf(fp, "\n Summary of events:\n\n");
return printed;
}
DEFINE_RESORT_RB(syscall_stats, a->msecs > b->msecs,
struct syscall_stats *stats;
double msecs;
int syscall;
)
{
struct int_node *source = rb_entry(nd, struct int_node, rb_node);
struct syscall_stats *stats = source->priv;
entry->syscall = source->i;
entry->stats = stats;
entry->msecs = stats ? (u64)stats->stats.n * (avg_stats(&stats->stats) / NSEC_PER_MSEC) : 0;
}
static size_t thread__dump_stats(struct thread_trace *ttrace,
struct trace *trace, FILE *fp)
{
size_t printed = 0;
struct syscall *sc;
struct rb_node *nd;
DECLARE_RESORT_RB_INTLIST(syscall_stats, ttrace->syscall_stats);
if (syscall_stats == NULL)
return 0;
printed += fprintf(fp, "\n");
printed += fprintf(fp, " syscall calls errors total min avg max stddev\n");
printed += fprintf(fp, " (msec) (msec) (msec) (msec) (%%)\n");
printed += fprintf(fp, " --------------- -------- ------ -------- --------- --------- --------- ------\n");
resort_rb__for_each_entry(nd, syscall_stats) {
struct syscall_stats *stats = syscall_stats_entry->stats;
if (stats) {
double min = (double)(stats->stats.min) / NSEC_PER_MSEC;
double max = (double)(stats->stats.max) / NSEC_PER_MSEC;
double avg = avg_stats(&stats->stats);
double pct;
u64 n = (u64)stats->stats.n;
pct = avg ? 100.0 * stddev_stats(&stats->stats) / avg : 0.0;
avg /= NSEC_PER_MSEC;
sc = &trace->syscalls.table[syscall_stats_entry->syscall];
printed += fprintf(fp, " %-15s", sc->name);
printed += fprintf(fp, " %8" PRIu64 " %6" PRIu64 " %9.3f %9.3f %9.3f",
n, stats->nr_failures, syscall_stats_entry->msecs, min, avg);
printed += fprintf(fp, " %9.3f %9.2f%%\n", max, pct);
if (trace->errno_summary && stats->nr_failures) {
int e;
for (e = 0; e < stats->max_errno; ++e) {
if (stats->errnos[e] != 0)
fprintf(fp, "\t\t\t\t%s: %d\n", perf_env__arch_strerrno(trace->host->env, e + 1), stats->errnos[e]);
}
}
}
}
resort_rb__delete(syscall_stats);
printed += fprintf(fp, "\n\n");
return printed;
}
static size_t trace__fprintf_thread(FILE *fp, struct thread *thread, struct trace *trace)
{
size_t printed = 0;
struct thread_trace *ttrace = thread__priv(thread);
double ratio;
if (ttrace == NULL)
return 0;
ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;
printed += fprintf(fp, " %s (%d), ", thread__comm_str(thread), thread__tid(thread));
printed += fprintf(fp, "%lu events, ", ttrace->nr_events);
printed += fprintf(fp, "%.1f%%", ratio);
if (ttrace->pfmaj)
printed += fprintf(fp, ", %lu majfaults", ttrace->pfmaj);
if (ttrace->pfmin)
printed += fprintf(fp, ", %lu minfaults", ttrace->pfmin);
if (trace->sched)
printed += fprintf(fp, ", %.3f msec\n", ttrace->runtime_ms);
else if (fputc('\n', fp) != EOF)
++printed;
printed += thread__dump_stats(ttrace, trace, fp);
return printed;
}
static unsigned long thread__nr_events(struct thread_trace *ttrace)
{
return ttrace ? ttrace->nr_events : 0;
}
static int trace_nr_events_cmp(void *priv __maybe_unused,
const struct list_head *la,
const struct list_head *lb)
{
struct thread_list *a = list_entry(la, struct thread_list, list);
struct thread_list *b = list_entry(lb, struct thread_list, list);
unsigned long a_nr_events = thread__nr_events(thread__priv(a->thread));
unsigned long b_nr_events = thread__nr_events(thread__priv(b->thread));
if (a_nr_events != b_nr_events)
return a_nr_events < b_nr_events ? -1 : 1;
/* Identical number of threads, place smaller tids first. */
return thread__tid(a->thread) < thread__tid(b->thread)
? -1
: (thread__tid(a->thread) > thread__tid(b->thread) ? 1 : 0);
}
static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
{
size_t printed = trace__fprintf_threads_header(fp);
LIST_HEAD(threads);
if (machine__thread_list(trace->host, &threads) == 0) {
struct thread_list *pos;
list_sort(NULL, &threads, trace_nr_events_cmp);
list_for_each_entry(pos, &threads, list)
printed += trace__fprintf_thread(fp, pos->thread, trace);
}
thread_list__delete(&threads);
return printed;
}
static int trace__set_duration(const struct option *opt, const char *str,
int unset __maybe_unused)
{
struct trace *trace = opt->value;
trace->duration_filter = atof(str);
return 0;
}
static int trace__set_filter_pids_from_option(const struct option *opt, const char *str,
int unset __maybe_unused)
{
int ret = -1;
size_t i;
struct trace *trace = opt->value;
/*
* FIXME: introduce a intarray class, plain parse csv and create a
* { int nr, int entries[] } struct...
*/
struct intlist *list = intlist__new(str);
if (list == NULL)
return -1;
i = trace->filter_pids.nr = intlist__nr_entries(list) + 1;
trace->filter_pids.entries = calloc(i, sizeof(pid_t));
if (trace->filter_pids.entries == NULL)
goto out;
trace->filter_pids.entries[0] = getpid();
for (i = 1; i < trace->filter_pids.nr; ++i)
trace->filter_pids.entries[i] = intlist__entry(list, i - 1)->i;
intlist__delete(list);
ret = 0;
out:
return ret;
}
static int trace__open_output(struct trace *trace, const char *filename)
{
struct stat st;
if (!stat(filename, &st) && st.st_size) {
char oldname[PATH_MAX];
scnprintf(oldname, sizeof(oldname), "%s.old", filename);
unlink(oldname);
rename(filename, oldname);
}
trace->output = fopen(filename, "w");
return trace->output == NULL ? -errno : 0;
}
static int parse_pagefaults(const struct option *opt, const char *str,
int unset __maybe_unused)
{
int *trace_pgfaults = opt->value;
if (strcmp(str, "all") == 0)
*trace_pgfaults |= TRACE_PFMAJ | TRACE_PFMIN;
else if (strcmp(str, "maj") == 0)
*trace_pgfaults |= TRACE_PFMAJ;
else if (strcmp(str, "min") == 0)
*trace_pgfaults |= TRACE_PFMIN;
else
return -1;
return 0;
}
static void evlist__set_default_evsel_handler(struct evlist *evlist, void *handler)
{
struct evsel *evsel;
evlist__for_each_entry(evlist, evsel) {
if (evsel->handler == NULL)
evsel->handler = handler;
}
}
static void evsel__set_syscall_arg_fmt(struct evsel *evsel, const char *name)
{
struct syscall_arg_fmt *fmt = evsel__syscall_arg_fmt(evsel);
if (fmt) {
const struct syscall_fmt *scfmt = syscall_fmt__find(name);
if (scfmt) {
int skip = 0;
if (strcmp(evsel->tp_format->format.fields->name, "__syscall_nr") == 0 ||
strcmp(evsel->tp_format->format.fields->name, "nr") == 0)
++skip;
memcpy(fmt + skip, scfmt->arg, (evsel->tp_format->format.nr_fields - skip) * sizeof(*fmt));
}
}
}
static int evlist__set_syscall_tp_fields(struct evlist *evlist, bool *use_btf)
{
struct evsel *evsel;
evlist__for_each_entry(evlist, evsel) {
if (evsel->priv || !evsel->tp_format)
continue;
if (strcmp(evsel->tp_format->system, "syscalls")) {
evsel__init_tp_arg_scnprintf(evsel, use_btf);
continue;
}
if (evsel__init_syscall_tp(evsel))
return -1;
if (!strncmp(evsel->tp_format->name, "sys_enter_", 10)) {
struct syscall_tp *sc = __evsel__syscall_tp(evsel);
if (__tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64)))
return -1;
evsel__set_syscall_arg_fmt(evsel, evsel->tp_format->name + sizeof("sys_enter_") - 1);
} else if (!strncmp(evsel->tp_format->name, "sys_exit_", 9)) {
struct syscall_tp *sc = __evsel__syscall_tp(evsel);
if (__tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap))
return -1;
evsel__set_syscall_arg_fmt(evsel, evsel->tp_format->name + sizeof("sys_exit_") - 1);
}
}
return 0;
}
/*
* XXX: Hackish, just splitting the combined -e+--event (syscalls
* (raw_syscalls:{sys_{enter,exit}} + events (tracepoints, HW, SW, etc) to use
* existing facilities unchanged (trace->ev_qualifier + parse_options()).
*
* It'd be better to introduce a parse_options() variant that would return a
* list with the terms it didn't match to an event...
*/
static int trace__parse_events_option(const struct option *opt, const char *str,
int unset __maybe_unused)
{
struct trace *trace = (struct trace *)opt->value;
const char *s = str;
char *sep = NULL, *lists[2] = { NULL, NULL, };
int len = strlen(str) + 1, err = -1, list, idx;
char *strace_groups_dir = system_path(STRACE_GROUPS_DIR);
char group_name[PATH_MAX];
const struct syscall_fmt *fmt;
if (strace_groups_dir == NULL)
return -1;
if (*s == '!') {
++s;
trace->not_ev_qualifier = true;
}
while (1) {
if ((sep = strchr(s, ',')) != NULL)
*sep = '\0';
list = 0;
if (syscalltbl__id(trace->sctbl, s) >= 0 ||
syscalltbl__strglobmatch_first(trace->sctbl, s, &idx) >= 0) {
list = 1;
goto do_concat;
}
fmt = syscall_fmt__find_by_alias(s);
if (fmt != NULL) {
list = 1;
s = fmt->name;
} else {
path__join(group_name, sizeof(group_name), strace_groups_dir, s);
if (access(group_name, R_OK) == 0)
list = 1;
}
do_concat:
if (lists[list]) {
sprintf(lists[list] + strlen(lists[list]), ",%s", s);
} else {
lists[list] = malloc(len);
if (lists[list] == NULL)
goto out;
strcpy(lists[list], s);
}
if (!sep)
break;
*sep = ',';
s = sep + 1;
}
if (lists[1] != NULL) {
struct strlist_config slist_config = {
.dirname = strace_groups_dir,
};
trace->ev_qualifier = strlist__new(lists[1], &slist_config);
if (trace->ev_qualifier == NULL) {
fputs("Not enough memory to parse event qualifier", trace->output);
goto out;
}
if (trace__validate_ev_qualifier(trace))
goto out;
trace->trace_syscalls = true;
}
err = 0;
if (lists[0]) {
struct parse_events_option_args parse_events_option_args = {
.evlistp = &trace->evlist,
};
struct option o = {
.value = &parse_events_option_args,
};
err = parse_events_option(&o, lists[0], 0);
}
out:
free(strace_groups_dir);
free(lists[0]);
free(lists[1]);
if (sep)
*sep = ',';
return err;
}
static int trace__parse_cgroups(const struct option *opt, const char *str, int unset)
{
struct trace *trace = opt->value;
if (!list_empty(&trace->evlist->core.entries)) {
struct option o = {
.value = &trace->evlist,
};
return parse_cgroups(&o, str, unset);
}
trace->cgroup = evlist__findnew_cgroup(trace->evlist, str);
return 0;
}
static int trace__config(const char *var, const char *value, void *arg)
{
struct trace *trace = arg;
int err = 0;
if (!strcmp(var, "trace.add_events")) {
trace->perfconfig_events = strdup(value);
if (trace->perfconfig_events == NULL) {
pr_err("Not enough memory for %s\n", "trace.add_events");
return -1;
}
} else if (!strcmp(var, "trace.show_timestamp")) {
trace->show_tstamp = perf_config_bool(var, value);
} else if (!strcmp(var, "trace.show_duration")) {
trace->show_duration = perf_config_bool(var, value);
} else if (!strcmp(var, "trace.show_arg_names")) {
trace->show_arg_names = perf_config_bool(var, value);
if (!trace->show_arg_names)
trace->show_zeros = true;
} else if (!strcmp(var, "trace.show_zeros")) {
bool new_show_zeros = perf_config_bool(var, value);
if (!trace->show_arg_names && !new_show_zeros) {
pr_warning("trace.show_zeros has to be set when trace.show_arg_names=no\n");
goto out;
}
trace->show_zeros = new_show_zeros;
} else if (!strcmp(var, "trace.show_prefix")) {
trace->show_string_prefix = perf_config_bool(var, value);
} else if (!strcmp(var, "trace.no_inherit")) {
trace->opts.no_inherit = perf_config_bool(var, value);
} else if (!strcmp(var, "trace.args_alignment")) {
int args_alignment = 0;
if (perf_config_int(&args_alignment, var, value) == 0)
trace->args_alignment = args_alignment;
} else if (!strcmp(var, "trace.tracepoint_beautifiers")) {
if (strcasecmp(value, "libtraceevent") == 0)
trace->libtraceevent_print = true;
else if (strcasecmp(value, "libbeauty") == 0)
trace->libtraceevent_print = false;
}
out:
return err;
}
static void trace__exit(struct trace *trace)
{
int i;
strlist__delete(trace->ev_qualifier);
zfree(&trace->ev_qualifier_ids.entries);
if (trace->syscalls.table) {
for (i = 0; i <= trace->sctbl->syscalls.max_id; i++)
syscall__exit(&trace->syscalls.table[i]);
zfree(&trace->syscalls.table);
}
syscalltbl__delete(trace->sctbl);
zfree(&trace->perfconfig_events);
}
#ifdef HAVE_BPF_SKEL
static int bpf__setup_bpf_output(struct evlist *evlist)
{
int err = parse_event(evlist, "bpf-output/no-inherit=1,name=__augmented_syscalls__/");
if (err)
pr_debug("ERROR: failed to create the \"__augmented_syscalls__\" bpf-output event\n");
return err;
}
#endif
int cmd_trace(int argc, const char **argv)
{
const char *trace_usage[] = {
"perf trace [<options>] [<command>]",
"perf trace [<options>] -- <command> [<options>]",
"perf trace record [<options>] [<command>]",
"perf trace record [<options>] -- <command> [<options>]",
NULL
};
struct trace trace = {
.opts = {
.target = {
.uid = UINT_MAX,
.uses_mmap = true,
},
.user_freq = UINT_MAX,
.user_interval = ULLONG_MAX,
.no_buffering = true,
.mmap_pages = UINT_MAX,
},
.output = stderr,
.show_comm = true,
.show_tstamp = true,
.show_duration = true,
.show_arg_names = true,
.args_alignment = 70,
.trace_syscalls = false,
.kernel_syscallchains = false,
.max_stack = UINT_MAX,
.max_events = ULONG_MAX,
};
const char *output_name = NULL;
const struct option trace_options[] = {
OPT_CALLBACK('e', "event", &trace, "event",
"event/syscall selector. use 'perf list' to list available events",
trace__parse_events_option),
OPT_CALLBACK(0, "filter", &trace.evlist, "filter",
"event filter", parse_filter),
OPT_BOOLEAN(0, "comm", &trace.show_comm,
"show the thread COMM next to its id"),
OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),
OPT_CALLBACK(0, "expr", &trace, "expr", "list of syscalls/events to trace",
trace__parse_events_option),
OPT_STRING('o', "output", &output_name, "file", "output file name"),
OPT_STRING('i', "input", &input_name, "file", "Analyze events in file"),
OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
"trace events on existing process id"),
OPT_STRING('t', "tid", &trace.opts.target.tid, "tid",
"trace events on existing thread id"),
OPT_CALLBACK(0, "filter-pids", &trace, "CSV list of pids",
"pids to filter (by the kernel)", trace__set_filter_pids_from_option),
OPT_BOOLEAN('a', "all-cpus", &trace.opts.target.system_wide,
"system-wide collection from all CPUs"),
OPT_STRING('C', "cpu", &trace.opts.target.cpu_list, "cpu",
"list of cpus to monitor"),
OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
"child tasks do not inherit counters"),
OPT_CALLBACK('m', "mmap-pages", &trace.opts.mmap_pages, "pages",
"number of mmap data pages", evlist__parse_mmap_pages),
OPT_STRING('u', "uid", &trace.opts.target.uid_str, "user",
"user to profile"),
OPT_CALLBACK(0, "duration", &trace, "float",
"show only events with duration > N.M ms",
trace__set_duration),
OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
OPT_INCR('v', "verbose", &verbose, "be more verbose"),
OPT_BOOLEAN('T', "time", &trace.full_time,
"Show full timestamp, not time relative to first start"),
OPT_BOOLEAN(0, "failure", &trace.failure_only,
"Show only syscalls that failed"),
OPT_BOOLEAN('s', "summary", &trace.summary_only,
"Show only syscall summary with statistics"),
OPT_BOOLEAN('S', "with-summary", &trace.summary,
"Show all syscalls and summary with statistics"),
OPT_BOOLEAN(0, "errno-summary", &trace.errno_summary,
"Show errno stats per syscall, use with -s or -S"),
OPT_CALLBACK_DEFAULT('F', "pf", &trace.trace_pgfaults, "all|maj|min",
"Trace pagefaults", parse_pagefaults, "maj"),
OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"),
OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"),
OPT_CALLBACK(0, "call-graph", &trace.opts,
"record_mode[,record_size]", record_callchain_help,
&record_parse_callchain_opt),
OPT_BOOLEAN(0, "libtraceevent_print", &trace.libtraceevent_print,
"Use libtraceevent to print the tracepoint arguments."),
OPT_BOOLEAN(0, "kernel-syscall-graph", &trace.kernel_syscallchains,
"Show the kernel callchains on the syscall exit path"),
OPT_ULONG(0, "max-events", &trace.max_events,
"Set the maximum number of events to print, exit after that is reached. "),
OPT_UINTEGER(0, "min-stack", &trace.min_stack,
"Set the minimum stack depth when parsing the callchain, "
"anything below the specified depth will be ignored."),
OPT_UINTEGER(0, "max-stack", &trace.max_stack,
"Set the maximum stack depth when parsing the callchain, "
"anything beyond the specified depth will be ignored. "
"Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
OPT_BOOLEAN(0, "sort-events", &trace.sort_events,
"Sort batch of events before processing, use if getting out of order events"),
OPT_BOOLEAN(0, "print-sample", &trace.print_sample,
"print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),
OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
"per thread proc mmap processing timeout in ms"),
OPT_CALLBACK('G', "cgroup", &trace, "name", "monitor event in cgroup name only",
trace__parse_cgroups),
OPT_INTEGER('D', "delay", &trace.opts.target.initial_delay,
"ms to wait before starting measurement after program "
"start"),
OPT_BOOLEAN(0, "force-btf", &trace.force_btf, "Prefer btf_dump general pretty printer"
"to customized ones"),
OPTS_EVSWITCH(&trace.evswitch),
OPT_END()
};
bool __maybe_unused max_stack_user_set = true;
bool mmap_pages_user_set = true;
struct evsel *evsel;
const char * const trace_subcommands[] = { "record", NULL };
int err = -1;
char bf[BUFSIZ];
struct sigaction sigchld_act;
signal(SIGSEGV, sighandler_dump_stack);
signal(SIGFPE, sighandler_dump_stack);
signal(SIGINT, sighandler_interrupt);
memset(&sigchld_act, 0, sizeof(sigchld_act));
sigchld_act.sa_flags = SA_SIGINFO;
sigchld_act.sa_sigaction = sighandler_chld;
sigaction(SIGCHLD, &sigchld_act, NULL);
trace.evlist = evlist__new();
trace.sctbl = syscalltbl__new();
if (trace.evlist == NULL || trace.sctbl == NULL) {
pr_err("Not enough memory to run!\n");
err = -ENOMEM;
goto out;
}
/*
* Parsing .perfconfig may entail creating a BPF event, that may need
* to create BPF maps, so bump RLIM_MEMLOCK as the default 64K setting
* is too small. This affects just this process, not touching the
* global setting. If it fails we'll get something in 'perf trace -v'
* to help diagnose the problem.
*/
rlimit__bump_memlock();
err = perf_config(trace__config, &trace);
if (err)
goto out;
argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);
/*
* Here we already passed thru trace__parse_events_option() and it has
* already figured out if -e syscall_name, if not but if --event
* foo:bar was used, the user is interested _just_ in those, say,
* tracepoint events, not in the strace-like syscall-name-based mode.
*
* This is important because we need to check if strace-like mode is
* needed to decided if we should filter out the eBPF
* __augmented_syscalls__ code, if it is in the mix, say, via
* .perfconfig trace.add_events, and filter those out.
*/
if (!trace.trace_syscalls && !trace.trace_pgfaults &&
trace.evlist->core.nr_entries == 0 /* Was --events used? */) {
trace.trace_syscalls = true;
}
/*
* Now that we have --verbose figured out, lets see if we need to parse
* events from .perfconfig, so that if those events fail parsing, say some
* BPF program fails, then we'll be able to use --verbose to see what went
* wrong in more detail.
*/
if (trace.perfconfig_events != NULL) {
struct parse_events_error parse_err;
parse_events_error__init(&parse_err);
err = parse_events(trace.evlist, trace.perfconfig_events, &parse_err);
if (err)
parse_events_error__print(&parse_err, trace.perfconfig_events);
parse_events_error__exit(&parse_err);
if (err)
goto out;
}
if ((nr_cgroups || trace.cgroup) && !trace.opts.target.system_wide) {
usage_with_options_msg(trace_usage, trace_options,
"cgroup monitoring only available in system-wide mode");
}
#ifdef HAVE_BPF_SKEL
if (!trace.trace_syscalls)
goto skip_augmentation;
if ((argc >= 1) && (strcmp(argv[0], "record") == 0)) {
pr_debug("Syscall augmentation fails with record, disabling augmentation");
goto skip_augmentation;
}
trace.skel = augmented_raw_syscalls_bpf__open();
if (!trace.skel) {
pr_debug("Failed to open augmented syscalls BPF skeleton");
} else {
/*
* Disable attaching the BPF programs except for sys_enter and
* sys_exit that tail call into this as necessary.
*/
struct bpf_program *prog;
bpf_object__for_each_program(prog, trace.skel->obj) {
if (prog != trace.skel->progs.sys_enter && prog != trace.skel->progs.sys_exit)
bpf_program__set_autoattach(prog, /*autoattach=*/false);
}
err = augmented_raw_syscalls_bpf__load(trace.skel);
if (err < 0) {
libbpf_strerror(err, bf, sizeof(bf));
pr_debug("Failed to load augmented syscalls BPF skeleton: %s\n", bf);
} else {
augmented_raw_syscalls_bpf__attach(trace.skel);
trace__add_syscall_newtp(&trace);
}
}
err = bpf__setup_bpf_output(trace.evlist);
if (err) {
libbpf_strerror(err, bf, sizeof(bf));
pr_err("ERROR: Setup BPF output event failed: %s\n", bf);
goto out;
}
trace.syscalls.events.bpf_output = evlist__last(trace.evlist);
assert(evsel__name_is(trace.syscalls.events.bpf_output, "__augmented_syscalls__"));
skip_augmentation:
#endif
err = -1;
if (trace.trace_pgfaults) {
trace.opts.sample_address = true;
trace.opts.sample_time = true;
}
if (trace.opts.mmap_pages == UINT_MAX)
mmap_pages_user_set = false;
if (trace.max_stack == UINT_MAX) {
trace.max_stack = input_name ? PERF_MAX_STACK_DEPTH : sysctl__max_stack();
max_stack_user_set = false;
}
#ifdef HAVE_DWARF_UNWIND_SUPPORT
if ((trace.min_stack || max_stack_user_set) && !callchain_param.enabled) {
record_opts__parse_callchain(&trace.opts, &callchain_param, "dwarf", false);
}
#endif
if (callchain_param.enabled) {
if (!mmap_pages_user_set && geteuid() == 0)
trace.opts.mmap_pages = perf_event_mlock_kb_in_pages() * 4;
symbol_conf.use_callchain = true;
}
if (trace.evlist->core.nr_entries > 0) {
bool use_btf = false;
evlist__set_default_evsel_handler(trace.evlist, trace__event_handler);
if (evlist__set_syscall_tp_fields(trace.evlist, &use_btf)) {
perror("failed to set syscalls:* tracepoint fields");
goto out;
}
if (use_btf)
trace__load_vmlinux_btf(&trace);
}
if (trace.sort_events) {
ordered_events__init(&trace.oe.data, ordered_events__deliver_event, &trace);
ordered_events__set_copy_on_queue(&trace.oe.data, true);
}
/*
* If we are augmenting syscalls, then combine what we put in the
* __augmented_syscalls__ BPF map with what is in the
* syscalls:sys_exit_FOO tracepoints, i.e. just like we do without BPF,
* combining raw_syscalls:sys_enter with raw_syscalls:sys_exit.
*
* We'll switch to look at two BPF maps, one for sys_enter and the
* other for sys_exit when we start augmenting the sys_exit paths with
* buffers that are being copied from kernel to userspace, think 'read'
* syscall.
*/
if (trace.syscalls.events.bpf_output) {
evlist__for_each_entry(trace.evlist, evsel) {
bool raw_syscalls_sys_exit = evsel__name_is(evsel, "raw_syscalls:sys_exit");
if (raw_syscalls_sys_exit) {
trace.raw_augmented_syscalls = true;
goto init_augmented_syscall_tp;
}
if (trace.syscalls.events.bpf_output->priv == NULL &&
strstr(evsel__name(evsel), "syscalls:sys_enter")) {
struct evsel *augmented = trace.syscalls.events.bpf_output;
if (evsel__init_augmented_syscall_tp(augmented, evsel) ||
evsel__init_augmented_syscall_tp_args(augmented))
goto out;
/*
* Augmented is __augmented_syscalls__ BPF_OUTPUT event
* Above we made sure we can get from the payload the tp fields
* that we get from syscalls:sys_enter tracefs format file.
*/
augmented->handler = trace__sys_enter;
/*
* Now we do the same for the *syscalls:sys_enter event so that
* if we handle it directly, i.e. if the BPF prog returns 0 so
* as not to filter it, then we'll handle it just like we would
* for the BPF_OUTPUT one:
*/
if (evsel__init_augmented_syscall_tp(evsel, evsel) ||
evsel__init_augmented_syscall_tp_args(evsel))
goto out;
evsel->handler = trace__sys_enter;
}
if (strstarts(evsel__name(evsel), "syscalls:sys_exit_")) {
struct syscall_tp *sc;
init_augmented_syscall_tp:
if (evsel__init_augmented_syscall_tp(evsel, evsel))
goto out;
sc = __evsel__syscall_tp(evsel);
/*
* For now with BPF raw_augmented we hook into
* raw_syscalls:sys_enter and there we get all
* 6 syscall args plus the tracepoint common
* fields and the syscall_nr (another long).
* So we check if that is the case and if so
* don't look after the sc->args_size but
* always after the full raw_syscalls:sys_enter
* payload, which is fixed.
*
* We'll revisit this later to pass
* s->args_size to the BPF augmenter (now
* tools/perf/examples/bpf/augmented_raw_syscalls.c,
* so that it copies only what we need for each
* syscall, like what happens when we use
* syscalls:sys_enter_NAME, so that we reduce
* the kernel/userspace traffic to just what is
* needed for each syscall.
*/
if (trace.raw_augmented_syscalls)
trace.raw_augmented_syscalls_args_size = (6 + 1) * sizeof(long) + sc->id.offset;
evsel__init_augmented_syscall_tp_ret(evsel);
evsel->handler = trace__sys_exit;
}
}
}
if ((argc >= 1) && (strcmp(argv[0], "record") == 0))
return trace__record(&trace, argc-1, &argv[1]);
/* Using just --errno-summary will trigger --summary */
if (trace.errno_summary && !trace.summary && !trace.summary_only)
trace.summary_only = true;
/* summary_only implies summary option, but don't overwrite summary if set */
if (trace.summary_only)
trace.summary = trace.summary_only;
if (output_name != NULL) {
err = trace__open_output(&trace, output_name);
if (err < 0) {
perror("failed to create output file");
goto out;
}
}
err = evswitch__init(&trace.evswitch, trace.evlist, stderr);
if (err)
goto out_close;
err = target__validate(&trace.opts.target);
if (err) {
target__strerror(&trace.opts.target, err, bf, sizeof(bf));
fprintf(trace.output, "%s", bf);
goto out_close;
}
err = target__parse_uid(&trace.opts.target);
if (err) {
target__strerror(&trace.opts.target, err, bf, sizeof(bf));
fprintf(trace.output, "%s", bf);
goto out_close;
}
if (!argc && target__none(&trace.opts.target))
trace.opts.target.system_wide = true;
if (input_name)
err = trace__replay(&trace);
else
err = trace__run(&trace, argc, argv);
out_close:
if (output_name != NULL)
fclose(trace.output);
out:
trace__exit(&trace);
#ifdef HAVE_BPF_SKEL
augmented_raw_syscalls_bpf__destroy(trace.skel);
#endif
return err;
}
Codebase Browser
linux