1201 lines
26 KiB
C
1201 lines
26 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
/*
|
||
|
* probe-file.c : operate ftrace k/uprobe events files
|
||
|
*
|
||
|
* Written by Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
|
||
|
*/
|
||
|
#include <errno.h>
|
||
|
#include <fcntl.h>
|
||
|
#include <sys/stat.h>
|
||
|
#include <sys/types.h>
|
||
|
#include <sys/uio.h>
|
||
|
#include <unistd.h>
|
||
|
#include <linux/zalloc.h>
|
||
|
#include "namespaces.h"
|
||
|
#include "event.h"
|
||
|
#include "strlist.h"
|
||
|
#include "strfilter.h"
|
||
|
#include "debug.h"
|
||
|
#include "build-id.h"
|
||
|
#include "dso.h"
|
||
|
#include "color.h"
|
||
|
#include "symbol.h"
|
||
|
#include "strbuf.h"
|
||
|
#include <api/fs/tracing_path.h>
|
||
|
#include <api/fs/fs.h>
|
||
|
#include "probe-event.h"
|
||
|
#include "probe-file.h"
|
||
|
#include "session.h"
|
||
|
#include "perf_regs.h"
|
||
|
#include "string2.h"
|
||
|
|
||
|
/* 4096 - 2 ('\n' + '\0') */
|
||
|
#define MAX_CMDLEN 4094
|
||
|
|
||
|
static bool print_common_warning(int err, bool readwrite)
|
||
|
{
|
||
|
if (err == -EACCES)
|
||
|
pr_warning("No permission to %s tracefs.\nPlease %s\n",
|
||
|
readwrite ? "write" : "read",
|
||
|
readwrite ? "run this command again with sudo." :
|
||
|
"try 'sudo mount -o remount,mode=755 /sys/kernel/tracing/'");
|
||
|
else
|
||
|
return false;
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
static bool print_configure_probe_event(int kerr, int uerr)
|
||
|
{
|
||
|
const char *config, *file;
|
||
|
|
||
|
if (kerr == -ENOENT && uerr == -ENOENT) {
|
||
|
file = "{k,u}probe_events";
|
||
|
config = "CONFIG_KPROBE_EVENTS=y and CONFIG_UPROBE_EVENTS=y";
|
||
|
} else if (kerr == -ENOENT) {
|
||
|
file = "kprobe_events";
|
||
|
config = "CONFIG_KPROBE_EVENTS=y";
|
||
|
} else if (uerr == -ENOENT) {
|
||
|
file = "uprobe_events";
|
||
|
config = "CONFIG_UPROBE_EVENTS=y";
|
||
|
} else
|
||
|
return false;
|
||
|
|
||
|
if (!debugfs__configured() && !tracefs__configured())
|
||
|
pr_warning("Debugfs or tracefs is not mounted\n"
|
||
|
"Please try 'sudo mount -t tracefs nodev /sys/kernel/tracing/'\n");
|
||
|
else
|
||
|
pr_warning("%s/%s does not exist.\nPlease rebuild kernel with %s.\n",
|
||
|
tracing_path_mount(), file, config);
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
static void print_open_warning(int err, bool uprobe, bool readwrite)
|
||
|
{
|
||
|
char sbuf[STRERR_BUFSIZE];
|
||
|
|
||
|
if (print_common_warning(err, readwrite))
|
||
|
return;
|
||
|
|
||
|
if (print_configure_probe_event(uprobe ? 0 : err, uprobe ? err : 0))
|
||
|
return;
|
||
|
|
||
|
pr_warning("Failed to open %s/%cprobe_events: %s\n",
|
||
|
tracing_path_mount(), uprobe ? 'u' : 'k',
|
||
|
str_error_r(-err, sbuf, sizeof(sbuf)));
|
||
|
}
|
||
|
|
||
|
static void print_both_open_warning(int kerr, int uerr, bool readwrite)
|
||
|
{
|
||
|
char sbuf[STRERR_BUFSIZE];
|
||
|
|
||
|
if (kerr == uerr && print_common_warning(kerr, readwrite))
|
||
|
return;
|
||
|
|
||
|
if (print_configure_probe_event(kerr, uerr))
|
||
|
return;
|
||
|
|
||
|
if (kerr < 0)
|
||
|
pr_warning("Failed to open %s/kprobe_events: %s.\n",
|
||
|
tracing_path_mount(),
|
||
|
str_error_r(-kerr, sbuf, sizeof(sbuf)));
|
||
|
if (uerr < 0)
|
||
|
pr_warning("Failed to open %s/uprobe_events: %s.\n",
|
||
|
tracing_path_mount(),
|
||
|
str_error_r(-uerr, sbuf, sizeof(sbuf)));
|
||
|
}
|
||
|
|
||
|
int open_trace_file(const char *trace_file, bool readwrite)
|
||
|
{
|
||
|
char buf[PATH_MAX];
|
||
|
int ret;
|
||
|
|
||
|
ret = e_snprintf(buf, PATH_MAX, "%s/%s", tracing_path_mount(), trace_file);
|
||
|
if (ret >= 0) {
|
||
|
pr_debug("Opening %s write=%d\n", buf, readwrite);
|
||
|
if (readwrite && !probe_event_dry_run)
|
||
|
ret = open(buf, O_RDWR | O_APPEND, 0);
|
||
|
else
|
||
|
ret = open(buf, O_RDONLY, 0);
|
||
|
|
||
|
if (ret < 0)
|
||
|
ret = -errno;
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int open_kprobe_events(bool readwrite)
|
||
|
{
|
||
|
return open_trace_file("kprobe_events", readwrite);
|
||
|
}
|
||
|
|
||
|
static int open_uprobe_events(bool readwrite)
|
||
|
{
|
||
|
return open_trace_file("uprobe_events", readwrite);
|
||
|
}
|
||
|
|
||
|
int probe_file__open(int flag)
|
||
|
{
|
||
|
int fd;
|
||
|
|
||
|
if (flag & PF_FL_UPROBE)
|
||
|
fd = open_uprobe_events(flag & PF_FL_RW);
|
||
|
else
|
||
|
fd = open_kprobe_events(flag & PF_FL_RW);
|
||
|
if (fd < 0)
|
||
|
print_open_warning(fd, flag & PF_FL_UPROBE, flag & PF_FL_RW);
|
||
|
|
||
|
return fd;
|
||
|
}
|
||
|
|
||
|
int probe_file__open_both(int *kfd, int *ufd, int flag)
|
||
|
{
|
||
|
if (!kfd || !ufd)
|
||
|
return -EINVAL;
|
||
|
|
||
|
*kfd = open_kprobe_events(flag & PF_FL_RW);
|
||
|
*ufd = open_uprobe_events(flag & PF_FL_RW);
|
||
|
if (*kfd < 0 && *ufd < 0) {
|
||
|
print_both_open_warning(*kfd, *ufd, flag & PF_FL_RW);
|
||
|
return *kfd;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Get raw string list of current kprobe_events or uprobe_events */
|
||
|
struct strlist *probe_file__get_rawlist(int fd)
|
||
|
{
|
||
|
int ret, idx, fddup;
|
||
|
FILE *fp;
|
||
|
char buf[MAX_CMDLEN];
|
||
|
char *p;
|
||
|
struct strlist *sl;
|
||
|
|
||
|
if (fd < 0)
|
||
|
return NULL;
|
||
|
|
||
|
sl = strlist__new(NULL, NULL);
|
||
|
if (sl == NULL)
|
||
|
return NULL;
|
||
|
|
||
|
fddup = dup(fd);
|
||
|
if (fddup < 0)
|
||
|
goto out_free_sl;
|
||
|
|
||
|
fp = fdopen(fddup, "r");
|
||
|
if (!fp)
|
||
|
goto out_close_fddup;
|
||
|
|
||
|
while (!feof(fp)) {
|
||
|
p = fgets(buf, MAX_CMDLEN, fp);
|
||
|
if (!p)
|
||
|
break;
|
||
|
|
||
|
idx = strlen(p) - 1;
|
||
|
if (p[idx] == '\n')
|
||
|
p[idx] = '\0';
|
||
|
ret = strlist__add(sl, buf);
|
||
|
if (ret < 0) {
|
||
|
pr_debug("strlist__add failed (%d)\n", ret);
|
||
|
goto out_close_fp;
|
||
|
}
|
||
|
}
|
||
|
fclose(fp);
|
||
|
|
||
|
return sl;
|
||
|
|
||
|
out_close_fp:
|
||
|
fclose(fp);
|
||
|
goto out_free_sl;
|
||
|
out_close_fddup:
|
||
|
close(fddup);
|
||
|
out_free_sl:
|
||
|
strlist__delete(sl);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
|
||
|
{
|
||
|
char buf[128];
|
||
|
struct strlist *sl, *rawlist;
|
||
|
struct str_node *ent;
|
||
|
struct probe_trace_event tev;
|
||
|
int ret = 0;
|
||
|
|
||
|
memset(&tev, 0, sizeof(tev));
|
||
|
rawlist = probe_file__get_rawlist(fd);
|
||
|
if (!rawlist)
|
||
|
return NULL;
|
||
|
sl = strlist__new(NULL, NULL);
|
||
|
strlist__for_each_entry(ent, rawlist) {
|
||
|
ret = parse_probe_trace_command(ent->s, &tev);
|
||
|
if (ret < 0)
|
||
|
break;
|
||
|
if (include_group) {
|
||
|
ret = e_snprintf(buf, 128, "%s:%s", tev.group,
|
||
|
tev.event);
|
||
|
if (ret >= 0)
|
||
|
ret = strlist__add(sl, buf);
|
||
|
} else
|
||
|
ret = strlist__add(sl, tev.event);
|
||
|
clear_probe_trace_event(&tev);
|
||
|
/* Skip if there is same name multi-probe event in the list */
|
||
|
if (ret == -EEXIST)
|
||
|
ret = 0;
|
||
|
if (ret < 0)
|
||
|
break;
|
||
|
}
|
||
|
strlist__delete(rawlist);
|
||
|
|
||
|
if (ret < 0) {
|
||
|
strlist__delete(sl);
|
||
|
return NULL;
|
||
|
}
|
||
|
return sl;
|
||
|
}
|
||
|
|
||
|
/* Get current perf-probe event names */
|
||
|
struct strlist *probe_file__get_namelist(int fd)
|
||
|
{
|
||
|
return __probe_file__get_namelist(fd, false);
|
||
|
}
|
||
|
|
||
|
int probe_file__add_event(int fd, struct probe_trace_event *tev)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
char *buf = synthesize_probe_trace_command(tev);
|
||
|
char sbuf[STRERR_BUFSIZE];
|
||
|
|
||
|
if (!buf) {
|
||
|
pr_debug("Failed to synthesize probe trace event.\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
pr_debug("Writing event: %s\n", buf);
|
||
|
if (!probe_event_dry_run) {
|
||
|
if (write(fd, buf, strlen(buf)) < (int)strlen(buf)) {
|
||
|
ret = -errno;
|
||
|
pr_warning("Failed to write event: %s\n",
|
||
|
str_error_r(errno, sbuf, sizeof(sbuf)));
|
||
|
}
|
||
|
}
|
||
|
free(buf);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int __del_trace_probe_event(int fd, struct str_node *ent)
|
||
|
{
|
||
|
char *p;
|
||
|
char buf[128];
|
||
|
int ret;
|
||
|
|
||
|
/* Convert from perf-probe event to trace-probe event */
|
||
|
ret = e_snprintf(buf, 128, "-:%s", ent->s);
|
||
|
if (ret < 0)
|
||
|
goto error;
|
||
|
|
||
|
p = strchr(buf + 2, ':');
|
||
|
if (!p) {
|
||
|
pr_debug("Internal error: %s should have ':' but not.\n",
|
||
|
ent->s);
|
||
|
ret = -ENOTSUP;
|
||
|
goto error;
|
||
|
}
|
||
|
*p = '/';
|
||
|
|
||
|
pr_debug("Writing event: %s\n", buf);
|
||
|
ret = write(fd, buf, strlen(buf));
|
||
|
if (ret < 0) {
|
||
|
ret = -errno;
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
error:
|
||
|
pr_warning("Failed to delete event: %s\n",
|
||
|
str_error_r(-ret, buf, sizeof(buf)));
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int probe_file__get_events(int fd, struct strfilter *filter,
|
||
|
struct strlist *plist)
|
||
|
{
|
||
|
struct strlist *namelist;
|
||
|
struct str_node *ent;
|
||
|
const char *p;
|
||
|
int ret = -ENOENT;
|
||
|
|
||
|
if (!plist)
|
||
|
return -EINVAL;
|
||
|
|
||
|
namelist = __probe_file__get_namelist(fd, true);
|
||
|
if (!namelist)
|
||
|
return -ENOENT;
|
||
|
|
||
|
strlist__for_each_entry(ent, namelist) {
|
||
|
p = strchr(ent->s, ':');
|
||
|
if ((p && strfilter__compare(filter, p + 1)) ||
|
||
|
strfilter__compare(filter, ent->s)) {
|
||
|
ret = strlist__add(plist, ent->s);
|
||
|
if (ret == -ENOMEM) {
|
||
|
pr_err("strlist__add failed with -ENOMEM\n");
|
||
|
goto out;
|
||
|
}
|
||
|
ret = 0;
|
||
|
}
|
||
|
}
|
||
|
out:
|
||
|
strlist__delete(namelist);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int probe_file__del_strlist(int fd, struct strlist *namelist)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
struct str_node *ent;
|
||
|
|
||
|
strlist__for_each_entry(ent, namelist) {
|
||
|
ret = __del_trace_probe_event(fd, ent);
|
||
|
if (ret < 0)
|
||
|
break;
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int probe_file__del_events(int fd, struct strfilter *filter)
|
||
|
{
|
||
|
struct strlist *namelist;
|
||
|
int ret;
|
||
|
|
||
|
namelist = strlist__new(NULL, NULL);
|
||
|
if (!namelist)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
ret = probe_file__get_events(fd, filter, namelist);
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
|
||
|
ret = probe_file__del_strlist(fd, namelist);
|
||
|
out:
|
||
|
strlist__delete(namelist);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* Caller must ensure to remove this entry from list */
|
||
|
static void probe_cache_entry__delete(struct probe_cache_entry *entry)
|
||
|
{
|
||
|
if (entry) {
|
||
|
BUG_ON(!list_empty(&entry->node));
|
||
|
|
||
|
strlist__delete(entry->tevlist);
|
||
|
clear_perf_probe_event(&entry->pev);
|
||
|
zfree(&entry->spev);
|
||
|
free(entry);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static struct probe_cache_entry *
|
||
|
probe_cache_entry__new(struct perf_probe_event *pev)
|
||
|
{
|
||
|
struct probe_cache_entry *entry = zalloc(sizeof(*entry));
|
||
|
|
||
|
if (entry) {
|
||
|
INIT_LIST_HEAD(&entry->node);
|
||
|
entry->tevlist = strlist__new(NULL, NULL);
|
||
|
if (!entry->tevlist)
|
||
|
zfree(&entry);
|
||
|
else if (pev) {
|
||
|
entry->spev = synthesize_perf_probe_command(pev);
|
||
|
if (!entry->spev ||
|
||
|
perf_probe_event__copy(&entry->pev, pev) < 0) {
|
||
|
probe_cache_entry__delete(entry);
|
||
|
return NULL;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return entry;
|
||
|
}
|
||
|
|
||
|
int probe_cache_entry__get_event(struct probe_cache_entry *entry,
|
||
|
struct probe_trace_event **tevs)
|
||
|
{
|
||
|
struct probe_trace_event *tev;
|
||
|
struct str_node *node;
|
||
|
int ret, i;
|
||
|
|
||
|
ret = strlist__nr_entries(entry->tevlist);
|
||
|
if (ret > probe_conf.max_probes)
|
||
|
return -E2BIG;
|
||
|
|
||
|
*tevs = zalloc(ret * sizeof(*tev));
|
||
|
if (!*tevs)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
i = 0;
|
||
|
strlist__for_each_entry(node, entry->tevlist) {
|
||
|
tev = &(*tevs)[i++];
|
||
|
ret = parse_probe_trace_command(node->s, tev);
|
||
|
if (ret < 0)
|
||
|
break;
|
||
|
}
|
||
|
return i;
|
||
|
}
|
||
|
|
||
|
/* For the kernel probe caches, pass target = NULL or DSO__NAME_KALLSYMS */
|
||
|
static int probe_cache__open(struct probe_cache *pcache, const char *target,
|
||
|
struct nsinfo *nsi)
|
||
|
{
|
||
|
char cpath[PATH_MAX];
|
||
|
char sbuildid[SBUILD_ID_SIZE];
|
||
|
char *dir_name = NULL;
|
||
|
bool is_kallsyms = false;
|
||
|
int ret, fd;
|
||
|
struct nscookie nsc;
|
||
|
|
||
|
if (target && build_id_cache__cached(target)) {
|
||
|
/* This is a cached buildid */
|
||
|
strlcpy(sbuildid, target, SBUILD_ID_SIZE);
|
||
|
dir_name = build_id_cache__linkname(sbuildid, NULL, 0);
|
||
|
goto found;
|
||
|
}
|
||
|
|
||
|
if (!target || !strcmp(target, DSO__NAME_KALLSYMS)) {
|
||
|
target = DSO__NAME_KALLSYMS;
|
||
|
is_kallsyms = true;
|
||
|
ret = sysfs__sprintf_build_id("/", sbuildid);
|
||
|
} else {
|
||
|
nsinfo__mountns_enter(nsi, &nsc);
|
||
|
ret = filename__sprintf_build_id(target, sbuildid);
|
||
|
nsinfo__mountns_exit(&nsc);
|
||
|
}
|
||
|
|
||
|
if (ret < 0) {
|
||
|
pr_debug("Failed to get build-id from %s.\n", target);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* If we have no buildid cache, make it */
|
||
|
if (!build_id_cache__cached(sbuildid)) {
|
||
|
ret = build_id_cache__add_s(sbuildid, target, nsi,
|
||
|
is_kallsyms, NULL);
|
||
|
if (ret < 0) {
|
||
|
pr_debug("Failed to add build-id cache: %s\n", target);
|
||
|
return ret;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
dir_name = build_id_cache__cachedir(sbuildid, target, nsi, is_kallsyms,
|
||
|
false);
|
||
|
found:
|
||
|
if (!dir_name) {
|
||
|
pr_debug("Failed to get cache from %s\n", target);
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
|
||
|
snprintf(cpath, PATH_MAX, "%s/probes", dir_name);
|
||
|
fd = open(cpath, O_CREAT | O_RDWR, 0644);
|
||
|
if (fd < 0)
|
||
|
pr_debug("Failed to open cache(%d): %s\n", fd, cpath);
|
||
|
free(dir_name);
|
||
|
pcache->fd = fd;
|
||
|
|
||
|
return fd;
|
||
|
}
|
||
|
|
||
|
static int probe_cache__load(struct probe_cache *pcache)
|
||
|
{
|
||
|
struct probe_cache_entry *entry = NULL;
|
||
|
char buf[MAX_CMDLEN], *p;
|
||
|
int ret = 0, fddup;
|
||
|
FILE *fp;
|
||
|
|
||
|
fddup = dup(pcache->fd);
|
||
|
if (fddup < 0)
|
||
|
return -errno;
|
||
|
fp = fdopen(fddup, "r");
|
||
|
if (!fp) {
|
||
|
close(fddup);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
while (!feof(fp)) {
|
||
|
if (!fgets(buf, MAX_CMDLEN, fp))
|
||
|
break;
|
||
|
p = strchr(buf, '\n');
|
||
|
if (p)
|
||
|
*p = '\0';
|
||
|
/* #perf_probe_event or %sdt_event */
|
||
|
if (buf[0] == '#' || buf[0] == '%') {
|
||
|
entry = probe_cache_entry__new(NULL);
|
||
|
if (!entry) {
|
||
|
ret = -ENOMEM;
|
||
|
goto out;
|
||
|
}
|
||
|
if (buf[0] == '%')
|
||
|
entry->sdt = true;
|
||
|
entry->spev = strdup(buf + 1);
|
||
|
if (entry->spev)
|
||
|
ret = parse_perf_probe_command(buf + 1,
|
||
|
&entry->pev);
|
||
|
else
|
||
|
ret = -ENOMEM;
|
||
|
if (ret < 0) {
|
||
|
probe_cache_entry__delete(entry);
|
||
|
goto out;
|
||
|
}
|
||
|
list_add_tail(&entry->node, &pcache->entries);
|
||
|
} else { /* trace_probe_event */
|
||
|
if (!entry) {
|
||
|
ret = -EINVAL;
|
||
|
goto out;
|
||
|
}
|
||
|
ret = strlist__add(entry->tevlist, buf);
|
||
|
if (ret == -ENOMEM) {
|
||
|
pr_err("strlist__add failed with -ENOMEM\n");
|
||
|
goto out;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
out:
|
||
|
fclose(fp);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static struct probe_cache *probe_cache__alloc(void)
|
||
|
{
|
||
|
struct probe_cache *pcache = zalloc(sizeof(*pcache));
|
||
|
|
||
|
if (pcache) {
|
||
|
INIT_LIST_HEAD(&pcache->entries);
|
||
|
pcache->fd = -EINVAL;
|
||
|
}
|
||
|
return pcache;
|
||
|
}
|
||
|
|
||
|
void probe_cache__purge(struct probe_cache *pcache)
|
||
|
{
|
||
|
struct probe_cache_entry *entry, *n;
|
||
|
|
||
|
list_for_each_entry_safe(entry, n, &pcache->entries, node) {
|
||
|
list_del_init(&entry->node);
|
||
|
probe_cache_entry__delete(entry);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void probe_cache__delete(struct probe_cache *pcache)
|
||
|
{
|
||
|
if (!pcache)
|
||
|
return;
|
||
|
|
||
|
probe_cache__purge(pcache);
|
||
|
if (pcache->fd > 0)
|
||
|
close(pcache->fd);
|
||
|
free(pcache);
|
||
|
}
|
||
|
|
||
|
struct probe_cache *probe_cache__new(const char *target, struct nsinfo *nsi)
|
||
|
{
|
||
|
struct probe_cache *pcache = probe_cache__alloc();
|
||
|
int ret;
|
||
|
|
||
|
if (!pcache)
|
||
|
return NULL;
|
||
|
|
||
|
ret = probe_cache__open(pcache, target, nsi);
|
||
|
if (ret < 0) {
|
||
|
pr_debug("Cache open error: %d\n", ret);
|
||
|
goto out_err;
|
||
|
}
|
||
|
|
||
|
ret = probe_cache__load(pcache);
|
||
|
if (ret < 0) {
|
||
|
pr_debug("Cache read error: %d\n", ret);
|
||
|
goto out_err;
|
||
|
}
|
||
|
|
||
|
return pcache;
|
||
|
|
||
|
out_err:
|
||
|
probe_cache__delete(pcache);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
static bool streql(const char *a, const char *b)
|
||
|
{
|
||
|
if (a == b)
|
||
|
return true;
|
||
|
|
||
|
if (!a || !b)
|
||
|
return false;
|
||
|
|
||
|
return !strcmp(a, b);
|
||
|
}
|
||
|
|
||
|
struct probe_cache_entry *
|
||
|
probe_cache__find(struct probe_cache *pcache, struct perf_probe_event *pev)
|
||
|
{
|
||
|
struct probe_cache_entry *entry = NULL;
|
||
|
char *cmd = synthesize_perf_probe_command(pev);
|
||
|
|
||
|
if (!cmd)
|
||
|
return NULL;
|
||
|
|
||
|
for_each_probe_cache_entry(entry, pcache) {
|
||
|
if (pev->sdt) {
|
||
|
if (entry->pev.event &&
|
||
|
streql(entry->pev.event, pev->event) &&
|
||
|
(!pev->group ||
|
||
|
streql(entry->pev.group, pev->group)))
|
||
|
goto found;
|
||
|
|
||
|
continue;
|
||
|
}
|
||
|
/* Hit if same event name or same command-string */
|
||
|
if ((pev->event &&
|
||
|
(streql(entry->pev.group, pev->group) &&
|
||
|
streql(entry->pev.event, pev->event))) ||
|
||
|
(!strcmp(entry->spev, cmd)))
|
||
|
goto found;
|
||
|
}
|
||
|
entry = NULL;
|
||
|
|
||
|
found:
|
||
|
free(cmd);
|
||
|
return entry;
|
||
|
}
|
||
|
|
||
|
struct probe_cache_entry *
|
||
|
probe_cache__find_by_name(struct probe_cache *pcache,
|
||
|
const char *group, const char *event)
|
||
|
{
|
||
|
struct probe_cache_entry *entry = NULL;
|
||
|
|
||
|
for_each_probe_cache_entry(entry, pcache) {
|
||
|
/* Hit if same event name or same command-string */
|
||
|
if (streql(entry->pev.group, group) &&
|
||
|
streql(entry->pev.event, event))
|
||
|
goto found;
|
||
|
}
|
||
|
entry = NULL;
|
||
|
|
||
|
found:
|
||
|
return entry;
|
||
|
}
|
||
|
|
||
|
int probe_cache__add_entry(struct probe_cache *pcache,
|
||
|
struct perf_probe_event *pev,
|
||
|
struct probe_trace_event *tevs, int ntevs)
|
||
|
{
|
||
|
struct probe_cache_entry *entry = NULL;
|
||
|
char *command;
|
||
|
int i, ret = 0;
|
||
|
|
||
|
if (!pcache || !pev || !tevs || ntevs <= 0) {
|
||
|
ret = -EINVAL;
|
||
|
goto out_err;
|
||
|
}
|
||
|
|
||
|
/* Remove old cache entry */
|
||
|
entry = probe_cache__find(pcache, pev);
|
||
|
if (entry) {
|
||
|
list_del_init(&entry->node);
|
||
|
probe_cache_entry__delete(entry);
|
||
|
}
|
||
|
|
||
|
ret = -ENOMEM;
|
||
|
entry = probe_cache_entry__new(pev);
|
||
|
if (!entry)
|
||
|
goto out_err;
|
||
|
|
||
|
for (i = 0; i < ntevs; i++) {
|
||
|
if (!tevs[i].point.symbol)
|
||
|
continue;
|
||
|
|
||
|
command = synthesize_probe_trace_command(&tevs[i]);
|
||
|
if (!command)
|
||
|
goto out_err;
|
||
|
ret = strlist__add(entry->tevlist, command);
|
||
|
if (ret == -ENOMEM) {
|
||
|
pr_err("strlist__add failed with -ENOMEM\n");
|
||
|
goto out_err;
|
||
|
}
|
||
|
|
||
|
free(command);
|
||
|
}
|
||
|
list_add_tail(&entry->node, &pcache->entries);
|
||
|
pr_debug("Added probe cache: %d\n", ntevs);
|
||
|
return 0;
|
||
|
|
||
|
out_err:
|
||
|
pr_debug("Failed to add probe caches\n");
|
||
|
probe_cache_entry__delete(entry);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
#ifdef HAVE_GELF_GETNOTE_SUPPORT
|
||
|
static unsigned long long sdt_note__get_addr(struct sdt_note *note)
|
||
|
{
|
||
|
return note->bit32 ?
|
||
|
(unsigned long long)note->addr.a32[SDT_NOTE_IDX_LOC] :
|
||
|
(unsigned long long)note->addr.a64[SDT_NOTE_IDX_LOC];
|
||
|
}
|
||
|
|
||
|
static unsigned long long sdt_note__get_ref_ctr_offset(struct sdt_note *note)
|
||
|
{
|
||
|
return note->bit32 ?
|
||
|
(unsigned long long)note->addr.a32[SDT_NOTE_IDX_REFCTR] :
|
||
|
(unsigned long long)note->addr.a64[SDT_NOTE_IDX_REFCTR];
|
||
|
}
|
||
|
|
||
|
static const char * const type_to_suffix[] = {
|
||
|
":s64", "", "", "", ":s32", "", ":s16", ":s8",
|
||
|
"", ":u8", ":u16", "", ":u32", "", "", "", ":u64"
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* Isolate the string number and convert it into a decimal value;
|
||
|
* this will be an index to get suffix of the uprobe name (defining
|
||
|
* the type)
|
||
|
*/
|
||
|
static int sdt_arg_parse_size(char *n_ptr, const char **suffix)
|
||
|
{
|
||
|
long type_idx;
|
||
|
|
||
|
type_idx = strtol(n_ptr, NULL, 10);
|
||
|
if (type_idx < -8 || type_idx > 8) {
|
||
|
pr_debug4("Failed to get a valid sdt type\n");
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
*suffix = type_to_suffix[type_idx + 8];
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int synthesize_sdt_probe_arg(struct strbuf *buf, int i, const char *arg)
|
||
|
{
|
||
|
char *op, *desc = strdup(arg), *new_op = NULL;
|
||
|
const char *suffix = "";
|
||
|
int ret = -1;
|
||
|
|
||
|
if (desc == NULL) {
|
||
|
pr_debug4("Allocation error\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Argument is in N@OP format. N is size of the argument and OP is
|
||
|
* the actual assembly operand. N can be omitted; in that case
|
||
|
* argument is just OP(without @).
|
||
|
*/
|
||
|
op = strchr(desc, '@');
|
||
|
if (op) {
|
||
|
op[0] = '\0';
|
||
|
op++;
|
||
|
|
||
|
if (sdt_arg_parse_size(desc, &suffix))
|
||
|
goto error;
|
||
|
} else {
|
||
|
op = desc;
|
||
|
}
|
||
|
|
||
|
ret = arch_sdt_arg_parse_op(op, &new_op);
|
||
|
|
||
|
if (ret < 0)
|
||
|
goto error;
|
||
|
|
||
|
if (ret == SDT_ARG_VALID) {
|
||
|
ret = strbuf_addf(buf, " arg%d=%s%s", i + 1, new_op, suffix);
|
||
|
if (ret < 0)
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
ret = 0;
|
||
|
error:
|
||
|
free(desc);
|
||
|
free(new_op);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static char *synthesize_sdt_probe_command(struct sdt_note *note,
|
||
|
const char *pathname,
|
||
|
const char *sdtgrp)
|
||
|
{
|
||
|
struct strbuf buf;
|
||
|
char *ret = NULL;
|
||
|
int i, args_count, err;
|
||
|
unsigned long long ref_ctr_offset;
|
||
|
char *arg;
|
||
|
int arg_idx = 0;
|
||
|
|
||
|
if (strbuf_init(&buf, 32) < 0)
|
||
|
return NULL;
|
||
|
|
||
|
err = strbuf_addf(&buf, "p:%s/%s %s:0x%llx",
|
||
|
sdtgrp, note->name, pathname,
|
||
|
sdt_note__get_addr(note));
|
||
|
|
||
|
ref_ctr_offset = sdt_note__get_ref_ctr_offset(note);
|
||
|
if (ref_ctr_offset && err >= 0)
|
||
|
err = strbuf_addf(&buf, "(0x%llx)", ref_ctr_offset);
|
||
|
|
||
|
if (err < 0)
|
||
|
goto error;
|
||
|
|
||
|
if (!note->args)
|
||
|
goto out;
|
||
|
|
||
|
if (note->args) {
|
||
|
char **args = argv_split(note->args, &args_count);
|
||
|
|
||
|
if (args == NULL)
|
||
|
goto error;
|
||
|
|
||
|
for (i = 0; i < args_count; ) {
|
||
|
/*
|
||
|
* FIXUP: Arm64 ELF section '.note.stapsdt' uses string
|
||
|
* format "-4@[sp, NUM]" if a probe is to access data in
|
||
|
* the stack, e.g. below is an example for the SDT
|
||
|
* Arguments:
|
||
|
*
|
||
|
* Arguments: -4@[sp, 12] -4@[sp, 8] -4@[sp, 4]
|
||
|
*
|
||
|
* Since the string introduces an extra space character
|
||
|
* in the middle of square brackets, the argument is
|
||
|
* divided into two items. Fixup for this case, if an
|
||
|
* item contains sub string "[sp,", need to concatenate
|
||
|
* the two items.
|
||
|
*/
|
||
|
if (strstr(args[i], "[sp,") && (i+1) < args_count) {
|
||
|
err = asprintf(&arg, "%s %s", args[i], args[i+1]);
|
||
|
i += 2;
|
||
|
} else {
|
||
|
err = asprintf(&arg, "%s", args[i]);
|
||
|
i += 1;
|
||
|
}
|
||
|
|
||
|
/* Failed to allocate memory */
|
||
|
if (err < 0) {
|
||
|
argv_free(args);
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
if (synthesize_sdt_probe_arg(&buf, arg_idx, arg) < 0) {
|
||
|
free(arg);
|
||
|
argv_free(args);
|
||
|
goto error;
|
||
|
}
|
||
|
|
||
|
free(arg);
|
||
|
arg_idx++;
|
||
|
}
|
||
|
|
||
|
argv_free(args);
|
||
|
}
|
||
|
|
||
|
out:
|
||
|
ret = strbuf_detach(&buf, NULL);
|
||
|
error:
|
||
|
strbuf_release(&buf);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname)
|
||
|
{
|
||
|
struct probe_cache_entry *entry = NULL;
|
||
|
struct list_head sdtlist;
|
||
|
struct sdt_note *note;
|
||
|
char *buf;
|
||
|
char sdtgrp[64];
|
||
|
int ret;
|
||
|
|
||
|
INIT_LIST_HEAD(&sdtlist);
|
||
|
ret = get_sdt_note_list(&sdtlist, pathname);
|
||
|
if (ret < 0) {
|
||
|
pr_debug4("Failed to get sdt note: %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
list_for_each_entry(note, &sdtlist, note_list) {
|
||
|
ret = snprintf(sdtgrp, 64, "sdt_%s", note->provider);
|
||
|
if (ret < 0)
|
||
|
break;
|
||
|
/* Try to find same-name entry */
|
||
|
entry = probe_cache__find_by_name(pcache, sdtgrp, note->name);
|
||
|
if (!entry) {
|
||
|
entry = probe_cache_entry__new(NULL);
|
||
|
if (!entry) {
|
||
|
ret = -ENOMEM;
|
||
|
break;
|
||
|
}
|
||
|
entry->sdt = true;
|
||
|
ret = asprintf(&entry->spev, "%s:%s=%s", sdtgrp,
|
||
|
note->name, note->name);
|
||
|
if (ret < 0)
|
||
|
break;
|
||
|
entry->pev.event = strdup(note->name);
|
||
|
entry->pev.group = strdup(sdtgrp);
|
||
|
list_add_tail(&entry->node, &pcache->entries);
|
||
|
}
|
||
|
buf = synthesize_sdt_probe_command(note, pathname, sdtgrp);
|
||
|
if (!buf) {
|
||
|
ret = -ENOMEM;
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
ret = strlist__add(entry->tevlist, buf);
|
||
|
|
||
|
free(buf);
|
||
|
entry = NULL;
|
||
|
|
||
|
if (ret == -ENOMEM) {
|
||
|
pr_err("strlist__add failed with -ENOMEM\n");
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
if (entry) {
|
||
|
list_del_init(&entry->node);
|
||
|
probe_cache_entry__delete(entry);
|
||
|
}
|
||
|
cleanup_sdt_note_list(&sdtlist);
|
||
|
return ret;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
static int probe_cache_entry__write(struct probe_cache_entry *entry, int fd)
|
||
|
{
|
||
|
struct str_node *snode;
|
||
|
struct stat st;
|
||
|
struct iovec iov[3];
|
||
|
const char *prefix = entry->sdt ? "%" : "#";
|
||
|
int ret;
|
||
|
/* Save stat for rollback */
|
||
|
ret = fstat(fd, &st);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
pr_debug("Writing cache: %s%s\n", prefix, entry->spev);
|
||
|
iov[0].iov_base = (void *)prefix; iov[0].iov_len = 1;
|
||
|
iov[1].iov_base = entry->spev; iov[1].iov_len = strlen(entry->spev);
|
||
|
iov[2].iov_base = (void *)"\n"; iov[2].iov_len = 1;
|
||
|
ret = writev(fd, iov, 3);
|
||
|
if (ret < (int)iov[1].iov_len + 2)
|
||
|
goto rollback;
|
||
|
|
||
|
strlist__for_each_entry(snode, entry->tevlist) {
|
||
|
iov[0].iov_base = (void *)snode->s;
|
||
|
iov[0].iov_len = strlen(snode->s);
|
||
|
iov[1].iov_base = (void *)"\n"; iov[1].iov_len = 1;
|
||
|
ret = writev(fd, iov, 2);
|
||
|
if (ret < (int)iov[0].iov_len + 1)
|
||
|
goto rollback;
|
||
|
}
|
||
|
return 0;
|
||
|
|
||
|
rollback:
|
||
|
/* Rollback to avoid cache file corruption */
|
||
|
if (ret > 0)
|
||
|
ret = -1;
|
||
|
if (ftruncate(fd, st.st_size) < 0)
|
||
|
ret = -2;
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int probe_cache__commit(struct probe_cache *pcache)
|
||
|
{
|
||
|
struct probe_cache_entry *entry;
|
||
|
int ret = 0;
|
||
|
|
||
|
/* TBD: if we do not update existing entries, skip it */
|
||
|
ret = lseek(pcache->fd, 0, SEEK_SET);
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
|
||
|
ret = ftruncate(pcache->fd, 0);
|
||
|
if (ret < 0)
|
||
|
goto out;
|
||
|
|
||
|
for_each_probe_cache_entry(entry, pcache) {
|
||
|
ret = probe_cache_entry__write(entry, pcache->fd);
|
||
|
pr_debug("Cache committed: %d\n", ret);
|
||
|
if (ret < 0)
|
||
|
break;
|
||
|
}
|
||
|
out:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static bool probe_cache_entry__compare(struct probe_cache_entry *entry,
|
||
|
struct strfilter *filter)
|
||
|
{
|
||
|
char buf[128], *ptr = entry->spev;
|
||
|
|
||
|
if (entry->pev.event) {
|
||
|
snprintf(buf, 128, "%s:%s", entry->pev.group, entry->pev.event);
|
||
|
ptr = buf;
|
||
|
}
|
||
|
return strfilter__compare(filter, ptr);
|
||
|
}
|
||
|
|
||
|
int probe_cache__filter_purge(struct probe_cache *pcache,
|
||
|
struct strfilter *filter)
|
||
|
{
|
||
|
struct probe_cache_entry *entry, *tmp;
|
||
|
|
||
|
list_for_each_entry_safe(entry, tmp, &pcache->entries, node) {
|
||
|
if (probe_cache_entry__compare(entry, filter)) {
|
||
|
pr_info("Removed cached event: %s\n", entry->spev);
|
||
|
list_del_init(&entry->node);
|
||
|
probe_cache_entry__delete(entry);
|
||
|
}
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int probe_cache__show_entries(struct probe_cache *pcache,
|
||
|
struct strfilter *filter)
|
||
|
{
|
||
|
struct probe_cache_entry *entry;
|
||
|
|
||
|
for_each_probe_cache_entry(entry, pcache) {
|
||
|
if (probe_cache_entry__compare(entry, filter))
|
||
|
printf("%s\n", entry->spev);
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* Show all cached probes */
|
||
|
int probe_cache__show_all_caches(struct strfilter *filter)
|
||
|
{
|
||
|
struct probe_cache *pcache;
|
||
|
struct strlist *bidlist;
|
||
|
struct str_node *nd;
|
||
|
char *buf = strfilter__string(filter);
|
||
|
|
||
|
pr_debug("list cache with filter: %s\n", buf);
|
||
|
free(buf);
|
||
|
|
||
|
bidlist = build_id_cache__list_all(true);
|
||
|
if (!bidlist) {
|
||
|
pr_debug("Failed to get buildids: %d\n", errno);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
strlist__for_each_entry(nd, bidlist) {
|
||
|
pcache = probe_cache__new(nd->s, NULL);
|
||
|
if (!pcache)
|
||
|
continue;
|
||
|
if (!list_empty(&pcache->entries)) {
|
||
|
buf = build_id_cache__origname(nd->s);
|
||
|
printf("%s (%s):\n", buf, nd->s);
|
||
|
free(buf);
|
||
|
probe_cache__show_entries(pcache, filter);
|
||
|
}
|
||
|
probe_cache__delete(pcache);
|
||
|
}
|
||
|
strlist__delete(bidlist);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
enum ftrace_readme {
|
||
|
FTRACE_README_PROBE_TYPE_X = 0,
|
||
|
FTRACE_README_KRETPROBE_OFFSET,
|
||
|
FTRACE_README_UPROBE_REF_CTR,
|
||
|
FTRACE_README_USER_ACCESS,
|
||
|
FTRACE_README_MULTIPROBE_EVENT,
|
||
|
FTRACE_README_IMMEDIATE_VALUE,
|
||
|
FTRACE_README_END,
|
||
|
};
|
||
|
|
||
|
static struct {
|
||
|
const char *pattern;
|
||
|
bool avail;
|
||
|
} ftrace_readme_table[] = {
|
||
|
#define DEFINE_TYPE(idx, pat) \
|
||
|
[idx] = {.pattern = pat, .avail = false}
|
||
|
DEFINE_TYPE(FTRACE_README_PROBE_TYPE_X, "*type: * x8/16/32/64,*"),
|
||
|
DEFINE_TYPE(FTRACE_README_KRETPROBE_OFFSET, "*place (kretprobe): *"),
|
||
|
DEFINE_TYPE(FTRACE_README_UPROBE_REF_CTR, "*ref_ctr_offset*"),
|
||
|
DEFINE_TYPE(FTRACE_README_USER_ACCESS, "*u]<offset>*"),
|
||
|
DEFINE_TYPE(FTRACE_README_MULTIPROBE_EVENT, "*Create/append/*"),
|
||
|
DEFINE_TYPE(FTRACE_README_IMMEDIATE_VALUE, "*\\imm-value,*"),
|
||
|
};
|
||
|
|
||
|
static bool scan_ftrace_readme(enum ftrace_readme type)
|
||
|
{
|
||
|
int fd;
|
||
|
FILE *fp;
|
||
|
char *buf = NULL;
|
||
|
size_t len = 0;
|
||
|
bool ret = false;
|
||
|
static bool scanned = false;
|
||
|
|
||
|
if (scanned)
|
||
|
goto result;
|
||
|
|
||
|
fd = open_trace_file("README", false);
|
||
|
if (fd < 0)
|
||
|
return ret;
|
||
|
|
||
|
fp = fdopen(fd, "r");
|
||
|
if (!fp) {
|
||
|
close(fd);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
while (getline(&buf, &len, fp) > 0)
|
||
|
for (enum ftrace_readme i = 0; i < FTRACE_README_END; i++)
|
||
|
if (!ftrace_readme_table[i].avail)
|
||
|
ftrace_readme_table[i].avail =
|
||
|
strglobmatch(buf, ftrace_readme_table[i].pattern);
|
||
|
scanned = true;
|
||
|
|
||
|
fclose(fp);
|
||
|
free(buf);
|
||
|
|
||
|
result:
|
||
|
if (type >= FTRACE_README_END)
|
||
|
return false;
|
||
|
|
||
|
return ftrace_readme_table[type].avail;
|
||
|
}
|
||
|
|
||
|
bool probe_type_is_available(enum probe_type type)
|
||
|
{
|
||
|
if (type >= PROBE_TYPE_END)
|
||
|
return false;
|
||
|
else if (type == PROBE_TYPE_X)
|
||
|
return scan_ftrace_readme(FTRACE_README_PROBE_TYPE_X);
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool kretprobe_offset_is_supported(void)
|
||
|
{
|
||
|
return scan_ftrace_readme(FTRACE_README_KRETPROBE_OFFSET);
|
||
|
}
|
||
|
|
||
|
bool uprobe_ref_ctr_is_supported(void)
|
||
|
{
|
||
|
return scan_ftrace_readme(FTRACE_README_UPROBE_REF_CTR);
|
||
|
}
|
||
|
|
||
|
bool user_access_is_supported(void)
|
||
|
{
|
||
|
return scan_ftrace_readme(FTRACE_README_USER_ACCESS);
|
||
|
}
|
||
|
|
||
|
bool multiprobe_event_is_supported(void)
|
||
|
{
|
||
|
return scan_ftrace_readme(FTRACE_README_MULTIPROBE_EVENT);
|
||
|
}
|
||
|
|
||
|
bool immediate_value_is_supported(void)
|
||
|
{
|
||
|
return scan_ftrace_readme(FTRACE_README_IMMEDIATE_VALUE);
|
||
|
}
|