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-rw-r--r--tools/perf/util/probe-file.c298
1 files changed, 209 insertions, 89 deletions
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index d679389e627c..5069fb61f48c 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -1,34 +1,28 @@
+// 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>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
*/
#include <errno.h>
+#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
-#include "util.h"
+#include <linux/zalloc.h>
+#include "namespaces.h"
#include "event.h"
#include "strlist.h"
#include "strfilter.h"
#include "debug.h"
-#include "cache.h"
+#include "build-id.h"
+#include "dso.h"
#include "color.h"
#include "symbol.h"
-#include "thread.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"
@@ -38,44 +32,78 @@
/* 4096 - 2 ('\n' + '\0') */
#define MAX_CMDLEN 4094
-static void print_open_warning(int err, bool uprobe)
+static bool print_common_warning(int err, bool readwrite)
{
- char sbuf[STRERR_BUFSIZE];
+ 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;
- if (err == -ENOENT) {
- const char *config;
+ return true;
+}
- if (uprobe)
- config = "CONFIG_UPROBE_EVENTS";
- else
- config = "CONFIG_KPROBE_EVENTS";
+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;
- pr_warning("%cprobe_events file does not exist"
- " - please rebuild kernel with %s.\n",
- uprobe ? 'u' : 'k', config);
- } else if (err == -ENOTSUP)
- pr_warning("Tracefs or debugfs is not mounted.\n");
+ 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("Failed to open %cprobe_events: %s\n",
- uprobe ? 'u' : 'k',
- str_error_r(-err, sbuf, sizeof(sbuf)));
+ 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)
+static void print_both_open_warning(int kerr, int uerr, bool readwrite)
{
- /* Both kprobes and uprobes are disabled, warn it. */
- if (kerr == -ENOTSUP && uerr == -ENOTSUP)
- pr_warning("Tracefs or debugfs is not mounted.\n");
- else if (kerr == -ENOENT && uerr == -ENOENT)
- pr_warning("Please rebuild kernel with CONFIG_KPROBE_EVENTS "
- "or/and CONFIG_UPROBE_EVENTS.\n");
- else {
- char sbuf[STRERR_BUFSIZE];
- pr_warning("Failed to open kprobe events: %s.\n",
+ 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)));
- pr_warning("Failed to open uprobe events: %s.\n",
+ 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)
@@ -83,8 +111,7 @@ 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, trace_file);
+ 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)
@@ -117,7 +144,7 @@ int probe_file__open(int flag)
else
fd = open_kprobe_events(flag & PF_FL_RW);
if (fd < 0)
- print_open_warning(fd, flag & PF_FL_UPROBE);
+ print_open_warning(fd, flag & PF_FL_UPROBE, flag & PF_FL_RW);
return fd;
}
@@ -130,7 +157,7 @@ int probe_file__open_both(int *kfd, int *ufd, int flag)
*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);
+ print_both_open_warning(*kfd, *ufd, flag & PF_FL_RW);
return *kfd;
}
@@ -214,6 +241,9 @@ static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
} 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;
}
@@ -309,10 +339,15 @@ int probe_file__get_events(int fd, struct strfilter *filter,
p = strchr(ent->s, ':');
if ((p && strfilter__compare(filter, p + 1)) ||
strfilter__compare(filter, ent->s)) {
- strlist__add(plist, 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;
@@ -331,25 +366,6 @@ int probe_file__del_strlist(int fd, struct strlist *namelist)
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)
- return ret;
-
- ret = probe_file__del_strlist(fd, namelist);
- 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)
{
@@ -412,17 +428,19 @@ int probe_cache_entry__get_event(struct probe_cache_entry *entry,
}
/* For the kernel probe caches, pass target = NULL or DSO__NAME_KALLSYMS */
-static int probe_cache__open(struct probe_cache *pcache, const char *target)
+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 */
- strncpy(sbuildid, target, SBUILD_ID_SIZE);
+ strlcpy(sbuildid, target, SBUILD_ID_SIZE);
dir_name = build_id_cache__linkname(sbuildid, NULL, 0);
goto found;
}
@@ -430,9 +448,12 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)
if (!target || !strcmp(target, DSO__NAME_KALLSYMS)) {
target = DSO__NAME_KALLSYMS;
is_kallsyms = true;
- ret = sysfs__sprintf_build_id("/", sbuildid);
- } else
- ret = filename__sprintf_build_id(target, sbuildid);
+ ret = sysfs__snprintf_build_id("/", sbuildid, sizeof(sbuildid));
+ } else {
+ nsinfo__mountns_enter(nsi, &nsc);
+ ret = filename__snprintf_build_id(target, sbuildid, sizeof(sbuildid));
+ nsinfo__mountns_exit(&nsc);
+ }
if (ret < 0) {
pr_debug("Failed to get build-id from %s.\n", target);
@@ -441,7 +462,7 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)
/* If we have no buildid cache, make it */
if (!build_id_cache__cached(sbuildid)) {
- ret = build_id_cache__add_s(sbuildid, target,
+ 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);
@@ -449,7 +470,7 @@ static int probe_cache__open(struct probe_cache *pcache, const char *target)
}
}
- dir_name = build_id_cache__cachedir(sbuildid, target, is_kallsyms,
+ dir_name = build_id_cache__cachedir(sbuildid, target, nsi, is_kallsyms,
false);
found:
if (!dir_name) {
@@ -514,7 +535,11 @@ static int probe_cache__load(struct probe_cache *pcache)
ret = -EINVAL;
goto out;
}
- strlist__add(entry->tevlist, buf);
+ ret = strlist__add(entry->tevlist, buf);
+ if (ret == -ENOMEM) {
+ pr_err("strlist__add failed with -ENOMEM\n");
+ goto out;
+ }
}
}
out:
@@ -554,7 +579,7 @@ void probe_cache__delete(struct probe_cache *pcache)
free(pcache);
}
-struct probe_cache *probe_cache__new(const char *target)
+struct probe_cache *probe_cache__new(const char *target, struct nsinfo *nsi)
{
struct probe_cache *pcache = probe_cache__alloc();
int ret;
@@ -562,7 +587,7 @@ struct probe_cache *probe_cache__new(const char *target)
if (!pcache)
return NULL;
- ret = probe_cache__open(pcache, target);
+ ret = probe_cache__open(pcache, target, nsi);
if (ret < 0) {
pr_debug("Cache open error: %d\n", ret);
goto out_err;
@@ -675,7 +700,12 @@ int probe_cache__add_entry(struct probe_cache *pcache,
command = synthesize_probe_trace_command(&tevs[i]);
if (!command)
goto out_err;
- strlist__add(entry->tevlist, command);
+ 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);
@@ -691,8 +721,16 @@ out_err:
#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[0]
- : (unsigned long long)note->addr.a64[0];
+ 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[] = {
@@ -769,27 +807,75 @@ static char *synthesize_sdt_probe_command(struct sdt_note *note,
const char *sdtgrp)
{
struct strbuf buf;
- char *ret = NULL, **args;
- int i, args_count;
+ 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;
- if (strbuf_addf(&buf, "p:%s/%s %s:0x%llx",
- sdtgrp, note->name, pathname,
- sdt_note__get_addr(note)) < 0)
+ 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) {
- args = argv_split(note->args, &args_count);
+ 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;
+ }
- for (i = 0; i < args_count; ++i) {
- if (synthesize_sdt_probe_arg(&buf, i, args[i]) < 0)
+ /* 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:
@@ -841,9 +927,15 @@ int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname)
break;
}
- strlist__add(entry->tevlist, buf);
+ 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);
@@ -974,7 +1066,7 @@ int probe_cache__show_all_caches(struct strfilter *filter)
return -EINVAL;
}
strlist__for_each_entry(nd, bidlist) {
- pcache = probe_cache__new(nd->s);
+ pcache = probe_cache__new(nd->s, NULL);
if (!pcache)
continue;
if (!list_empty(&pcache->entries)) {
@@ -993,6 +1085,10 @@ int probe_cache__show_all_caches(struct strfilter *filter)
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,
};
@@ -1004,6 +1100,10 @@ static struct {
[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)
@@ -1059,3 +1159,23 @@ 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);
+}
generated by cgit (git 2.34.1) at 2025-12-25 00:25:21 +0000