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perf probe: Move ftrace probe-event operations to probe-file.c 

Move ftrace probe-event operations to probe-file.c from probe-event.c.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20150715091407.8915.14316.stgit@localhost.localdomain
[ Fixed up strlist__new() calls wrt 4a77e2183f ("perf strlist: Make dupstr be the...") ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2015-07-15 18:14:07 +09:00 committed by Arnaldo Carvalho de Melo
parent a3c9de6280
commit 92f6c72e7a
5 changed files with 353 additions and 292 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/perf/util/Build
View File

@ -79,6 +79,7 @@ libperf-$(CONFIG_AUXTRACE) += auxtrace.o
libperf-y += parse-branch-options.o
libperf-$(CONFIG_LIBELF) += symbol-elf.o
libperf-$(CONFIG_LIBELF) += probe-file.o
libperf-$(CONFIG_LIBELF) += probe-event.o
ifndef CONFIG_LIBELF

318
tools/perf/util/probe-event.c
View File

@ -45,6 +45,7 @@
#include "trace-event.h" /* For __maybe_unused */
#include "probe-event.h"
#include "probe-finder.h"
#include "probe-file.h"
#include "session.h"
#define MAX_CMDLEN 256
@ -55,11 +56,7 @@ struct probe_conf probe_conf;
#define semantic_error(msg ...) pr_err("Semantic error :" msg)
/* If there is no space to write, returns -E2BIG. */
static int e_snprintf(char *str, size_t size, const char *format, ...)
__attribute__((format(printf, 3, 4)));
static int e_snprintf(char *str, size_t size, const char *format, ...)
int e_snprintf(char *str, size_t size, const char *format, ...)
{
int ret;
va_list ap;
@ -72,7 +69,6 @@ static int e_snprintf(char *str, size_t size, const char *format, ...)
}
static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
static void clear_probe_trace_event(struct probe_trace_event *tev);
static struct machine *host_machine;
/* Initialize symbol maps and path of vmlinux/modules */
@ -1467,8 +1463,7 @@ bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
}
/* Parse probe_events event into struct probe_point */
static int parse_probe_trace_command(const char *cmd,
struct probe_trace_event *tev)
int parse_probe_trace_command(const char *cmd, struct probe_trace_event *tev)
{
struct probe_trace_point *tp = &tev->point;
char pr;
@ -1951,7 +1946,7 @@ void clear_perf_probe_event(struct perf_probe_event *pev)
memset(pev, 0, sizeof(*pev));
}
static void clear_probe_trace_event(struct probe_trace_event *tev)
void clear_probe_trace_event(struct probe_trace_event *tev)
{
struct probe_trace_arg_ref *ref, *next;
int i;
@ -1976,119 +1971,6 @@ static void clear_probe_trace_event(struct probe_trace_event *tev)
memset(tev, 0, sizeof(*tev));
}
static void print_open_warning(int err, bool is_kprobe)
{
char sbuf[STRERR_BUFSIZE];
if (err == -ENOENT) {
const char *config;
if (!is_kprobe)
config = "CONFIG_UPROBE_EVENTS";
else
config = "CONFIG_KPROBE_EVENTS";
pr_warning("%cprobe_events file does not exist"
" - please rebuild kernel with %s.\n",
is_kprobe ? 'k' : 'u', config);
} else if (err == -ENOTSUP)
pr_warning("Tracefs or debugfs is not mounted.\n");
else
pr_warning("Failed to open %cprobe_events: %s\n",
is_kprobe ? 'k' : 'u',
strerror_r(-err, sbuf, sizeof(sbuf)));
}
static void print_both_open_warning(int kerr, int uerr)
{
/* 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",
strerror_r(-kerr, sbuf, sizeof(sbuf)));
pr_warning("Failed to open uprobe events: %s.\n",
strerror_r(-uerr, sbuf, sizeof(sbuf)));
}
}
static int open_probe_events(const char *trace_file, bool readwrite)
{
char buf[PATH_MAX];
const char *__debugfs;
const char *tracing_dir = "";
int ret;
__debugfs = tracefs_find_mountpoint();
if (__debugfs == NULL) {
tracing_dir = "tracing/";
__debugfs = debugfs_find_mountpoint();
if (__debugfs == NULL)
return -ENOTSUP;
}
ret = e_snprintf(buf, PATH_MAX, "%s/%s%s",
__debugfs, tracing_dir, 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_probe_events("kprobe_events", readwrite);
}
static int open_uprobe_events(bool readwrite)
{
return open_probe_events("uprobe_events", readwrite);
}
/* Get raw string list of current kprobe_events or uprobe_events */
static struct strlist *get_probe_trace_command_rawlist(int fd)
{
int ret, idx;
FILE *fp;
char buf[MAX_CMDLEN];
char *p;
struct strlist *sl;
sl = strlist__new(NULL, NULL);
fp = fdopen(dup(fd), "r");
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);
strlist__delete(sl);
return NULL;
}
}
fclose(fp);
return sl;
}
struct kprobe_blacklist_node {
struct list_head list;
unsigned long start;
@ -2284,7 +2166,7 @@ static int __show_perf_probe_events(int fd, bool is_kprobe,
memset(&tev, 0, sizeof(tev));
memset(&pev, 0, sizeof(pev));
rawlist = get_probe_trace_command_rawlist(fd);
rawlist = probe_file__get_rawlist(fd);
if (!rawlist)
return -ENOMEM;
@ -2325,89 +2207,20 @@ int show_perf_probe_events(struct strfilter *filter)
if (ret < 0)
return ret;
kp_fd = open_kprobe_events(false);
if (kp_fd >= 0) {
ret = probe_file__open_both(&kp_fd, &up_fd, 0);
if (ret < 0)
return ret;
if (kp_fd >= 0)
ret = __show_perf_probe_events(kp_fd, true, filter);
close(kp_fd);
if (ret < 0)
goto out;
}
up_fd = open_uprobe_events(false);
if (kp_fd < 0 && up_fd < 0) {
print_both_open_warning(kp_fd, up_fd);
ret = kp_fd;
goto out;
}
if (up_fd >= 0) {
if (up_fd >= 0 && ret >= 0)
ret = __show_perf_probe_events(up_fd, false, filter);
if (kp_fd > 0)
close(kp_fd);
if (up_fd > 0)
close(up_fd);
}
out:
exit_symbol_maps();
return ret;
}
/* Get current perf-probe event names */
static struct strlist *get_probe_trace_event_names(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 = get_probe_trace_command_rawlist(fd);
if (!rawlist)
return NULL;
sl = strlist__new(NULL, NULL);
strlist__for_each(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);
if (ret < 0)
break;
}
strlist__delete(rawlist);
if (ret < 0) {
strlist__delete(sl);
return NULL;
}
return sl;
}
static int write_probe_trace_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) {
ret = write(fd, buf, strlen(buf));
if (ret <= 0) {
ret = -errno;
pr_warning("Failed to write event: %s\n",
strerror_r(errno, sbuf, sizeof(sbuf)));
}
}
free(buf);
return ret;
}
@ -2527,18 +2340,12 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
const char *event = NULL, *group = NULL;
struct strlist *namelist;
if (pev->uprobes)
fd = open_uprobe_events(true);
else
fd = open_kprobe_events(true);
if (fd < 0) {
print_open_warning(fd, !pev->uprobes);
fd = probe_file__open(PF_FL_RW | (pev->uprobes ? PF_FL_UPROBE : 0));
if (fd < 0)
return fd;
}
/* Get current event names */
namelist = get_probe_trace_event_names(fd, false);
namelist = probe_file__get_namelist(fd);
if (!namelist) {
pr_debug("Failed to get current event list.\n");
ret = -ENOMEM;
@ -2559,7 +2366,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
if (ret < 0)
break;
ret = write_probe_trace_event(fd, tev);
ret = probe_file__add_event(fd, tev);
if (ret < 0)
break;
@ -2854,68 +2661,9 @@ end:
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;
}
pr_info("Removed event: %s\n", ent->s);
return 0;
error:
pr_warning("Failed to delete event: %s\n",
strerror_r(-ret, buf, sizeof(buf)));
return ret;
}
static int del_trace_probe_events(int fd, struct strfilter *filter,
struct strlist *namelist)
{
struct str_node *ent;
const char *p;
int ret = -ENOENT;
if (!namelist)
return -ENOENT;
strlist__for_each(ent, namelist) {
p = strchr(ent->s, ':');
if ((p && strfilter__compare(filter, p + 1)) ||
strfilter__compare(filter, ent->s)) {
ret = __del_trace_probe_event(fd, ent);
if (ret < 0)
break;
}
}
return ret;
}
int del_perf_probe_events(struct strfilter *filter)
{
int ret, ret2, ufd = -1, kfd = -1;
struct strlist *namelist = NULL, *unamelist = NULL;
char *str = strfilter__string(filter);
if (!str)
@ -2924,25 +2672,15 @@ int del_perf_probe_events(struct strfilter *filter)
pr_debug("Delete filter: \'%s\'\n", str);
/* Get current event names */
kfd = open_kprobe_events(true);
if (kfd >= 0)
namelist = get_probe_trace_event_names(kfd, true);
ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
if (ret < 0)
goto out;
ufd = open_uprobe_events(true);
if (ufd >= 0)
unamelist = get_probe_trace_event_names(ufd, true);
if (kfd < 0 && ufd < 0) {
print_both_open_warning(kfd, ufd);
ret = kfd;
goto error;
}
ret = del_trace_probe_events(kfd, filter, namelist);
ret = probe_file__del_events(kfd, filter);
if (ret < 0 && ret != -ENOENT)
goto error;
ret2 = del_trace_probe_events(ufd, filter, unamelist);
ret2 = probe_file__del_events(ufd, filter);
if (ret2 < 0 && ret2 != -ENOENT) {
ret = ret2;
goto error;
@ -2953,15 +2691,11 @@ int del_perf_probe_events(struct strfilter *filter)
ret = 0;
error:
if (kfd >= 0) {
strlist__delete(namelist);
if (kfd >= 0)
close(kfd);
}
if (ufd >= 0) {
strlist__delete(unamelist);
if (ufd >= 0)
close(ufd);
}
out:
free(str);
return ret;

7
tools/perf/util/probe-event.h
View File

@ -109,6 +109,8 @@ struct variable_list {
/* Command string to events */
extern int parse_perf_probe_command(const char *cmd,
struct perf_probe_event *pev);
extern int parse_probe_trace_command(const char *cmd,
struct probe_trace_event *tev);
/* Events to command string */
extern char *synthesize_perf_probe_command(struct perf_probe_event *pev);
@ -121,6 +123,7 @@ extern bool perf_probe_event_need_dwarf(struct perf_probe_event *pev);
/* Release event contents */
extern void clear_perf_probe_event(struct perf_probe_event *pev);
extern void clear_probe_trace_event(struct probe_trace_event *tev);
/* Command string to line-range */
extern int parse_line_range_desc(const char *cmd, struct line_range *lr);
@ -144,6 +147,10 @@ bool arch__prefers_symtab(void);
void arch__fix_tev_from_maps(struct perf_probe_event *pev,
struct probe_trace_event *tev, struct map *map);
/* If there is no space to write, returns -E2BIG. */
int e_snprintf(char *str, size_t size, const char *format, ...)
__attribute__((format(printf, 3, 4)));
/* Maximum index number of event-name postfix */
#define MAX_EVENT_INDEX 1024

301
tools/perf/util/probe-file.c Normal file
View File

@ -0,0 +1,301 @@
/*
* 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 "util.h"
#include "event.h"
#include "strlist.h"
#include "debug.h"
#include "cache.h"
#include "color.h"
#include "symbol.h"
#include "thread.h"
#include <api/fs/debugfs.h>
#include <api/fs/tracefs.h>
#include "probe-event.h"
#include "probe-file.h"
#include "session.h"
#define MAX_CMDLEN 256
static void print_open_warning(int err, bool uprobe)
{
char sbuf[STRERR_BUFSIZE];
if (err == -ENOENT) {
const char *config;
if (uprobe)
config = "CONFIG_UPROBE_EVENTS";
else
config = "CONFIG_KPROBE_EVENTS";
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");
else
pr_warning("Failed to open %cprobe_events: %s\n",
uprobe ? 'u' : 'k',
strerror_r(-err, sbuf, sizeof(sbuf)));
}
static void print_both_open_warning(int kerr, int uerr)
{
/* 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",
strerror_r(-kerr, sbuf, sizeof(sbuf)));
pr_warning("Failed to open uprobe events: %s.\n",
strerror_r(-uerr, sbuf, sizeof(sbuf)));
}
}
static int open_probe_events(const char *trace_file, bool readwrite)
{
char buf[PATH_MAX];
const char *__debugfs;
const char *tracing_dir = "";
int ret;
__debugfs = tracefs_find_mountpoint();
if (__debugfs == NULL) {
tracing_dir = "tracing/";
__debugfs = debugfs_find_mountpoint();
if (__debugfs == NULL)
return -ENOTSUP;
}
ret = e_snprintf(buf, PATH_MAX, "%s/%s%s",
__debugfs, tracing_dir, 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_probe_events("kprobe_events", readwrite);
}
static int open_uprobe_events(bool readwrite)
{
return open_probe_events("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);
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);
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;
FILE *fp;
char buf[MAX_CMDLEN];
char *p;
struct strlist *sl;
sl = strlist__new(NULL, NULL);
fp = fdopen(dup(fd), "r");
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);
strlist__delete(sl);
return NULL;
}
}
fclose(fp);
return sl;
}
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(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);
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) {
ret = write(fd, buf, strlen(buf));
if (ret <= 0) {
ret = -errno;
pr_warning("Failed to write event: %s\n",
strerror_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;
}
pr_info("Removed event: %s\n", ent->s);
return 0;
error:
pr_warning("Failed to delete event: %s\n",
strerror_r(-ret, buf, sizeof(buf)));
return ret;
}
int probe_file__del_events(int fd, struct strfilter *filter)
{
struct strlist *namelist;
struct str_node *ent;
const char *p;
int ret = -ENOENT;
namelist = __probe_file__get_namelist(fd, true);
if (!namelist)
return -ENOENT;
strlist__for_each(ent, namelist) {
p = strchr(ent->s, ':');
if ((p && strfilter__compare(filter, p + 1)) ||
strfilter__compare(filter, ent->s)) {
ret = __del_trace_probe_event(fd, ent);
if (ret < 0)
break;
}
}
strlist__delete(namelist);
return ret;
}

18
tools/perf/util/probe-file.h Normal file
View File

@ -0,0 +1,18 @@
#ifndef __PROBE_FILE_H
#define __PROBE_FILE_H
#include "strlist.h"
#include "strfilter.h"
#include "probe-event.h"
#define PF_FL_UPROBE 1
#define PF_FL_RW 2
int probe_file__open(int flag);
int probe_file__open_both(int *kfd, int *ufd, int flag);
struct strlist *probe_file__get_namelist(int fd);
struct strlist *probe_file__get_rawlist(int fd);
int probe_file__add_event(int fd, struct probe_trace_event *tev);
int probe_file__del_events(int fd, struct strfilter *filter);
#endif