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14a8fd7cee
Support adding probes on offline kernel modules. This enables perf-probe to trace kernel-module init functions via perf-probe. If user gives the path of module with -m option, perf-probe expects the module is offline. This feature works with --add, --funcs, and --vars. E.g) # perf probe -m /lib/modules/`uname -r`/kernel/fs/btrfs/btrfs.ko \ -a "extent_io_init:5 extent_state_cache" Add new events: probe:extent_io_init (on extent_io_init:5 with extent_state_cache) probe:extent_io_init_1 (on extent_io_init:5 with extent_state_cache) You can now use it on all perf tools, such as: perf record -e probe:extent_io_init_1 -aR sleep 1 Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Link: http://lkml.kernel.org/r/20110627072751.6528.10230.stgit@fedora15 Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2089 lines
46 KiB
C
2089 lines
46 KiB
C
/*
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* probe-event.c : perf-probe definition to probe_events format converter
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#define _GNU_SOURCE
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#include <sys/utsname.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <limits.h>
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#include <elf.h>
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#undef _GNU_SOURCE
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#include "util.h"
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#include "event.h"
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#include "string.h"
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#include "strlist.h"
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#include "debug.h"
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#include "cache.h"
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#include "color.h"
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#include "symbol.h"
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#include "thread.h"
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#include "debugfs.h"
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#include "trace-event.h" /* For __unused */
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#include "probe-event.h"
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#include "probe-finder.h"
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#define MAX_CMDLEN 256
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#define MAX_PROBE_ARGS 128
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#define PERFPROBE_GROUP "probe"
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bool probe_event_dry_run; /* Dry run flag */
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#define semantic_error(msg ...) pr_err("Semantic error :" msg)
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/* If there is no space to write, returns -E2BIG. */
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static int e_snprintf(char *str, size_t size, const char *format, ...)
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__attribute__((format(printf, 3, 4)));
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static int e_snprintf(char *str, size_t size, const char *format, ...)
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{
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int ret;
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va_list ap;
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va_start(ap, format);
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ret = vsnprintf(str, size, format, ap);
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va_end(ap);
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if (ret >= (int)size)
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ret = -E2BIG;
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return ret;
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}
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static char *synthesize_perf_probe_point(struct perf_probe_point *pp);
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static struct machine machine;
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/* Initialize symbol maps and path of vmlinux/modules */
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static int init_vmlinux(void)
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{
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int ret;
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symbol_conf.sort_by_name = true;
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if (symbol_conf.vmlinux_name == NULL)
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symbol_conf.try_vmlinux_path = true;
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else
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pr_debug("Use vmlinux: %s\n", symbol_conf.vmlinux_name);
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ret = symbol__init();
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if (ret < 0) {
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pr_debug("Failed to init symbol map.\n");
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goto out;
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}
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ret = machine__init(&machine, "", HOST_KERNEL_ID);
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if (ret < 0)
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goto out;
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if (machine__create_kernel_maps(&machine) < 0) {
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pr_debug("machine__create_kernel_maps() failed.\n");
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goto out;
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}
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out:
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if (ret < 0)
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pr_warning("Failed to init vmlinux path.\n");
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return ret;
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}
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static struct symbol *__find_kernel_function_by_name(const char *name,
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struct map **mapp)
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{
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return machine__find_kernel_function_by_name(&machine, name, mapp,
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NULL);
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}
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static struct map *kernel_get_module_map(const char *module)
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{
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struct rb_node *nd;
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struct map_groups *grp = &machine.kmaps;
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/* A file path -- this is an offline module */
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if (module && strchr(module, '/'))
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return machine__new_module(&machine, 0, module);
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if (!module)
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module = "kernel";
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for (nd = rb_first(&grp->maps[MAP__FUNCTION]); nd; nd = rb_next(nd)) {
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struct map *pos = rb_entry(nd, struct map, rb_node);
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if (strncmp(pos->dso->short_name + 1, module,
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pos->dso->short_name_len - 2) == 0) {
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return pos;
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}
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}
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return NULL;
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}
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static struct dso *kernel_get_module_dso(const char *module)
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{
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struct dso *dso;
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struct map *map;
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const char *vmlinux_name;
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if (module) {
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list_for_each_entry(dso, &machine.kernel_dsos, node) {
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if (strncmp(dso->short_name + 1, module,
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dso->short_name_len - 2) == 0)
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goto found;
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}
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pr_debug("Failed to find module %s.\n", module);
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return NULL;
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}
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map = machine.vmlinux_maps[MAP__FUNCTION];
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dso = map->dso;
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vmlinux_name = symbol_conf.vmlinux_name;
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if (vmlinux_name) {
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if (dso__load_vmlinux(dso, map, vmlinux_name, NULL) <= 0)
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return NULL;
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} else {
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if (dso__load_vmlinux_path(dso, map, NULL) <= 0) {
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pr_debug("Failed to load kernel map.\n");
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return NULL;
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}
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}
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found:
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return dso;
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}
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const char *kernel_get_module_path(const char *module)
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{
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struct dso *dso = kernel_get_module_dso(module);
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return (dso) ? dso->long_name : NULL;
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}
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#ifdef DWARF_SUPPORT
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/* Open new debuginfo of given module */
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static struct debuginfo *open_debuginfo(const char *module)
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{
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const char *path;
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/* A file path -- this is an offline module */
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if (module && strchr(module, '/'))
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path = module;
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else {
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path = kernel_get_module_path(module);
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if (!path) {
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pr_err("Failed to find path of %s module.\n",
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module ?: "kernel");
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return NULL;
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}
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}
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return debuginfo__new(path);
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}
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/*
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* Convert trace point to probe point with debuginfo
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* Currently only handles kprobes.
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*/
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static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
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struct perf_probe_point *pp)
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{
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struct symbol *sym;
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struct map *map;
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u64 addr;
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int ret = -ENOENT;
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struct debuginfo *dinfo;
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sym = __find_kernel_function_by_name(tp->symbol, &map);
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if (sym) {
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addr = map->unmap_ip(map, sym->start + tp->offset);
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pr_debug("try to find %s+%ld@%" PRIx64 "\n", tp->symbol,
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tp->offset, addr);
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dinfo = debuginfo__new_online_kernel(addr);
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if (dinfo) {
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ret = debuginfo__find_probe_point(dinfo,
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(unsigned long)addr, pp);
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debuginfo__delete(dinfo);
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} else {
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pr_debug("Failed to open debuginfo at 0x%" PRIx64 "\n",
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addr);
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ret = -ENOENT;
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}
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}
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if (ret <= 0) {
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pr_debug("Failed to find corresponding probes from "
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"debuginfo. Use kprobe event information.\n");
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pp->function = strdup(tp->symbol);
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if (pp->function == NULL)
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return -ENOMEM;
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pp->offset = tp->offset;
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}
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pp->retprobe = tp->retprobe;
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return 0;
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}
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static int add_module_to_probe_trace_events(struct probe_trace_event *tevs,
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int ntevs, const char *module)
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{
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int i, ret = 0;
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char *tmp;
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if (!module)
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return 0;
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tmp = strrchr(module, '/');
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if (tmp) {
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/* This is a module path -- get the module name */
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module = strdup(tmp + 1);
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if (!module)
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return -ENOMEM;
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tmp = strchr(module, '.');
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if (tmp)
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*tmp = '\0';
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tmp = (char *)module; /* For free() */
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}
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for (i = 0; i < ntevs; i++) {
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tevs[i].point.module = strdup(module);
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if (!tevs[i].point.module) {
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ret = -ENOMEM;
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break;
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}
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}
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if (tmp)
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free(tmp);
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return ret;
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}
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/* Try to find perf_probe_event with debuginfo */
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static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
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struct probe_trace_event **tevs,
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int max_tevs, const char *module)
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{
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bool need_dwarf = perf_probe_event_need_dwarf(pev);
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struct debuginfo *dinfo = open_debuginfo(module);
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int ntevs, ret = 0;
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if (!dinfo) {
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if (need_dwarf) {
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pr_warning("Failed to open debuginfo file.\n");
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return -ENOENT;
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}
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pr_debug("Could not open debuginfo. Try to use symbols.\n");
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return 0;
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}
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/* Searching trace events corresponding to a probe event */
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ntevs = debuginfo__find_trace_events(dinfo, pev, tevs, max_tevs);
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debuginfo__delete(dinfo);
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if (ntevs > 0) { /* Succeeded to find trace events */
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pr_debug("find %d probe_trace_events.\n", ntevs);
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if (module)
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ret = add_module_to_probe_trace_events(*tevs, ntevs,
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module);
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return ret < 0 ? ret : ntevs;
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}
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if (ntevs == 0) { /* No error but failed to find probe point. */
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pr_warning("Probe point '%s' not found.\n",
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synthesize_perf_probe_point(&pev->point));
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return -ENOENT;
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}
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/* Error path : ntevs < 0 */
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pr_debug("An error occurred in debuginfo analysis (%d).\n", ntevs);
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if (ntevs == -EBADF) {
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pr_warning("Warning: No dwarf info found in the vmlinux - "
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"please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
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if (!need_dwarf) {
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pr_debug("Trying to use symbols.\n");
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return 0;
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}
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}
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return ntevs;
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}
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/*
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* Find a src file from a DWARF tag path. Prepend optional source path prefix
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* and chop off leading directories that do not exist. Result is passed back as
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* a newly allocated path on success.
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* Return 0 if file was found and readable, -errno otherwise.
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*/
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static int get_real_path(const char *raw_path, const char *comp_dir,
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char **new_path)
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{
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const char *prefix = symbol_conf.source_prefix;
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if (!prefix) {
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if (raw_path[0] != '/' && comp_dir)
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/* If not an absolute path, try to use comp_dir */
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prefix = comp_dir;
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else {
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if (access(raw_path, R_OK) == 0) {
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*new_path = strdup(raw_path);
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return 0;
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} else
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return -errno;
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}
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}
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*new_path = malloc((strlen(prefix) + strlen(raw_path) + 2));
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if (!*new_path)
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return -ENOMEM;
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for (;;) {
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sprintf(*new_path, "%s/%s", prefix, raw_path);
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if (access(*new_path, R_OK) == 0)
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return 0;
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if (!symbol_conf.source_prefix)
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/* In case of searching comp_dir, don't retry */
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return -errno;
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switch (errno) {
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case ENAMETOOLONG:
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case ENOENT:
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case EROFS:
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case EFAULT:
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raw_path = strchr(++raw_path, '/');
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if (!raw_path) {
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free(*new_path);
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*new_path = NULL;
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return -ENOENT;
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}
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continue;
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default:
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free(*new_path);
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*new_path = NULL;
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return -errno;
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}
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}
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}
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#define LINEBUF_SIZE 256
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#define NR_ADDITIONAL_LINES 2
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static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
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{
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char buf[LINEBUF_SIZE];
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const char *color = show_num ? "" : PERF_COLOR_BLUE;
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const char *prefix = NULL;
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do {
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if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
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goto error;
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if (skip)
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continue;
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if (!prefix) {
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prefix = show_num ? "%7d " : " ";
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color_fprintf(stdout, color, prefix, l);
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}
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color_fprintf(stdout, color, "%s", buf);
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} while (strchr(buf, '\n') == NULL);
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return 1;
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error:
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if (ferror(fp)) {
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pr_warning("File read error: %s\n", strerror(errno));
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return -1;
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}
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return 0;
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}
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static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
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{
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int rv = __show_one_line(fp, l, skip, show_num);
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if (rv == 0) {
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pr_warning("Source file is shorter than expected.\n");
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rv = -1;
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}
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return rv;
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}
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#define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
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#define show_one_line(f,l) _show_one_line(f,l,false,false)
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#define skip_one_line(f,l) _show_one_line(f,l,true,false)
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#define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
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|
|
/*
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* Show line-range always requires debuginfo to find source file and
|
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* line number.
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*/
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int show_line_range(struct line_range *lr, const char *module)
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|
{
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int l = 1;
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|
struct line_node *ln;
|
|
struct debuginfo *dinfo;
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|
FILE *fp;
|
|
int ret;
|
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char *tmp;
|
|
|
|
/* Search a line range */
|
|
ret = init_vmlinux();
|
|
if (ret < 0)
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|
return ret;
|
|
|
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dinfo = open_debuginfo(module);
|
|
if (!dinfo) {
|
|
pr_warning("Failed to open debuginfo file.\n");
|
|
return -ENOENT;
|
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}
|
|
|
|
ret = debuginfo__find_line_range(dinfo, lr);
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|
debuginfo__delete(dinfo);
|
|
if (ret == 0) {
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|
pr_warning("Specified source line is not found.\n");
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|
return -ENOENT;
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|
} else if (ret < 0) {
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|
pr_warning("Debuginfo analysis failed. (%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Convert source file path */
|
|
tmp = lr->path;
|
|
ret = get_real_path(tmp, lr->comp_dir, &lr->path);
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|
free(tmp); /* Free old path */
|
|
if (ret < 0) {
|
|
pr_warning("Failed to find source file. (%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
setup_pager();
|
|
|
|
if (lr->function)
|
|
fprintf(stdout, "<%s@%s:%d>\n", lr->function, lr->path,
|
|
lr->start - lr->offset);
|
|
else
|
|
fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
|
|
|
|
fp = fopen(lr->path, "r");
|
|
if (fp == NULL) {
|
|
pr_warning("Failed to open %s: %s\n", lr->path,
|
|
strerror(errno));
|
|
return -errno;
|
|
}
|
|
/* Skip to starting line number */
|
|
while (l < lr->start) {
|
|
ret = skip_one_line(fp, l++);
|
|
if (ret < 0)
|
|
goto end;
|
|
}
|
|
|
|
list_for_each_entry(ln, &lr->line_list, list) {
|
|
for (; ln->line > l; l++) {
|
|
ret = show_one_line(fp, l - lr->offset);
|
|
if (ret < 0)
|
|
goto end;
|
|
}
|
|
ret = show_one_line_with_num(fp, l++ - lr->offset);
|
|
if (ret < 0)
|
|
goto end;
|
|
}
|
|
|
|
if (lr->end == INT_MAX)
|
|
lr->end = l + NR_ADDITIONAL_LINES;
|
|
while (l <= lr->end) {
|
|
ret = show_one_line_or_eof(fp, l++ - lr->offset);
|
|
if (ret <= 0)
|
|
break;
|
|
}
|
|
end:
|
|
fclose(fp);
|
|
return ret;
|
|
}
|
|
|
|
static int show_available_vars_at(struct debuginfo *dinfo,
|
|
struct perf_probe_event *pev,
|
|
int max_vls, struct strfilter *_filter,
|
|
bool externs)
|
|
{
|
|
char *buf;
|
|
int ret, i, nvars;
|
|
struct str_node *node;
|
|
struct variable_list *vls = NULL, *vl;
|
|
const char *var;
|
|
|
|
buf = synthesize_perf_probe_point(&pev->point);
|
|
if (!buf)
|
|
return -EINVAL;
|
|
pr_debug("Searching variables at %s\n", buf);
|
|
|
|
ret = debuginfo__find_available_vars_at(dinfo, pev, &vls,
|
|
max_vls, externs);
|
|
if (ret <= 0) {
|
|
pr_err("Failed to find variables at %s (%d)\n", buf, ret);
|
|
goto end;
|
|
}
|
|
/* Some variables are found */
|
|
fprintf(stdout, "Available variables at %s\n", buf);
|
|
for (i = 0; i < ret; i++) {
|
|
vl = &vls[i];
|
|
/*
|
|
* A probe point might be converted to
|
|
* several trace points.
|
|
*/
|
|
fprintf(stdout, "\t@<%s+%lu>\n", vl->point.symbol,
|
|
vl->point.offset);
|
|
free(vl->point.symbol);
|
|
nvars = 0;
|
|
if (vl->vars) {
|
|
strlist__for_each(node, vl->vars) {
|
|
var = strchr(node->s, '\t') + 1;
|
|
if (strfilter__compare(_filter, var)) {
|
|
fprintf(stdout, "\t\t%s\n", node->s);
|
|
nvars++;
|
|
}
|
|
}
|
|
strlist__delete(vl->vars);
|
|
}
|
|
if (nvars == 0)
|
|
fprintf(stdout, "\t\t(No matched variables)\n");
|
|
}
|
|
free(vls);
|
|
end:
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
/* Show available variables on given probe point */
|
|
int show_available_vars(struct perf_probe_event *pevs, int npevs,
|
|
int max_vls, const char *module,
|
|
struct strfilter *_filter, bool externs)
|
|
{
|
|
int i, ret = 0;
|
|
struct debuginfo *dinfo;
|
|
|
|
ret = init_vmlinux();
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dinfo = open_debuginfo(module);
|
|
if (!dinfo) {
|
|
pr_warning("Failed to open debuginfo file.\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
setup_pager();
|
|
|
|
for (i = 0; i < npevs && ret >= 0; i++)
|
|
ret = show_available_vars_at(dinfo, &pevs[i], max_vls, _filter,
|
|
externs);
|
|
|
|
debuginfo__delete(dinfo);
|
|
return ret;
|
|
}
|
|
|
|
#else /* !DWARF_SUPPORT */
|
|
|
|
static int kprobe_convert_to_perf_probe(struct probe_trace_point *tp,
|
|
struct perf_probe_point *pp)
|
|
{
|
|
struct symbol *sym;
|
|
|
|
sym = __find_kernel_function_by_name(tp->symbol, NULL);
|
|
if (!sym) {
|
|
pr_err("Failed to find symbol %s in kernel.\n", tp->symbol);
|
|
return -ENOENT;
|
|
}
|
|
pp->function = strdup(tp->symbol);
|
|
if (pp->function == NULL)
|
|
return -ENOMEM;
|
|
pp->offset = tp->offset;
|
|
pp->retprobe = tp->retprobe;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs __unused,
|
|
int max_tevs __unused, const char *mod __unused)
|
|
{
|
|
if (perf_probe_event_need_dwarf(pev)) {
|
|
pr_warning("Debuginfo-analysis is not supported.\n");
|
|
return -ENOSYS;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int show_line_range(struct line_range *lr __unused, const char *module __unused)
|
|
{
|
|
pr_warning("Debuginfo-analysis is not supported.\n");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int show_available_vars(struct perf_probe_event *pevs __unused,
|
|
int npevs __unused, int max_vls __unused,
|
|
const char *module __unused,
|
|
struct strfilter *filter __unused,
|
|
bool externs __unused)
|
|
{
|
|
pr_warning("Debuginfo-analysis is not supported.\n");
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
static int parse_line_num(char **ptr, int *val, const char *what)
|
|
{
|
|
const char *start = *ptr;
|
|
|
|
errno = 0;
|
|
*val = strtol(*ptr, ptr, 0);
|
|
if (errno || *ptr == start) {
|
|
semantic_error("'%s' is not a valid number.\n", what);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Stuff 'lr' according to the line range described by 'arg'.
|
|
* The line range syntax is described by:
|
|
*
|
|
* SRC[:SLN[+NUM|-ELN]]
|
|
* FNC[@SRC][:SLN[+NUM|-ELN]]
|
|
*/
|
|
int parse_line_range_desc(const char *arg, struct line_range *lr)
|
|
{
|
|
char *range, *file, *name = strdup(arg);
|
|
int err;
|
|
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
lr->start = 0;
|
|
lr->end = INT_MAX;
|
|
|
|
range = strchr(name, ':');
|
|
if (range) {
|
|
*range++ = '\0';
|
|
|
|
err = parse_line_num(&range, &lr->start, "start line");
|
|
if (err)
|
|
goto err;
|
|
|
|
if (*range == '+' || *range == '-') {
|
|
const char c = *range++;
|
|
|
|
err = parse_line_num(&range, &lr->end, "end line");
|
|
if (err)
|
|
goto err;
|
|
|
|
if (c == '+') {
|
|
lr->end += lr->start;
|
|
/*
|
|
* Adjust the number of lines here.
|
|
* If the number of lines == 1, the
|
|
* the end of line should be equal to
|
|
* the start of line.
|
|
*/
|
|
lr->end--;
|
|
}
|
|
}
|
|
|
|
pr_debug("Line range is %d to %d\n", lr->start, lr->end);
|
|
|
|
err = -EINVAL;
|
|
if (lr->start > lr->end) {
|
|
semantic_error("Start line must be smaller"
|
|
" than end line.\n");
|
|
goto err;
|
|
}
|
|
if (*range != '\0') {
|
|
semantic_error("Tailing with invalid str '%s'.\n", range);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
file = strchr(name, '@');
|
|
if (file) {
|
|
*file = '\0';
|
|
lr->file = strdup(++file);
|
|
if (lr->file == NULL) {
|
|
err = -ENOMEM;
|
|
goto err;
|
|
}
|
|
lr->function = name;
|
|
} else if (strchr(name, '.'))
|
|
lr->file = name;
|
|
else
|
|
lr->function = name;
|
|
|
|
return 0;
|
|
err:
|
|
free(name);
|
|
return err;
|
|
}
|
|
|
|
/* Check the name is good for event/group */
|
|
static bool check_event_name(const char *name)
|
|
{
|
|
if (!isalpha(*name) && *name != '_')
|
|
return false;
|
|
while (*++name != '\0') {
|
|
if (!isalpha(*name) && !isdigit(*name) && *name != '_')
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Parse probepoint definition. */
|
|
static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
|
|
{
|
|
struct perf_probe_point *pp = &pev->point;
|
|
char *ptr, *tmp;
|
|
char c, nc = 0;
|
|
/*
|
|
* <Syntax>
|
|
* perf probe [EVENT=]SRC[:LN|;PTN]
|
|
* perf probe [EVENT=]FUNC[@SRC][+OFFS|%return|:LN|;PAT]
|
|
*
|
|
* TODO:Group name support
|
|
*/
|
|
|
|
ptr = strpbrk(arg, ";=@+%");
|
|
if (ptr && *ptr == '=') { /* Event name */
|
|
*ptr = '\0';
|
|
tmp = ptr + 1;
|
|
if (strchr(arg, ':')) {
|
|
semantic_error("Group name is not supported yet.\n");
|
|
return -ENOTSUP;
|
|
}
|
|
if (!check_event_name(arg)) {
|
|
semantic_error("%s is bad for event name -it must "
|
|
"follow C symbol-naming rule.\n", arg);
|
|
return -EINVAL;
|
|
}
|
|
pev->event = strdup(arg);
|
|
if (pev->event == NULL)
|
|
return -ENOMEM;
|
|
pev->group = NULL;
|
|
arg = tmp;
|
|
}
|
|
|
|
ptr = strpbrk(arg, ";:+@%");
|
|
if (ptr) {
|
|
nc = *ptr;
|
|
*ptr++ = '\0';
|
|
}
|
|
|
|
tmp = strdup(arg);
|
|
if (tmp == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* Check arg is function or file and copy it */
|
|
if (strchr(tmp, '.')) /* File */
|
|
pp->file = tmp;
|
|
else /* Function */
|
|
pp->function = tmp;
|
|
|
|
/* Parse other options */
|
|
while (ptr) {
|
|
arg = ptr;
|
|
c = nc;
|
|
if (c == ';') { /* Lazy pattern must be the last part */
|
|
pp->lazy_line = strdup(arg);
|
|
if (pp->lazy_line == NULL)
|
|
return -ENOMEM;
|
|
break;
|
|
}
|
|
ptr = strpbrk(arg, ";:+@%");
|
|
if (ptr) {
|
|
nc = *ptr;
|
|
*ptr++ = '\0';
|
|
}
|
|
switch (c) {
|
|
case ':': /* Line number */
|
|
pp->line = strtoul(arg, &tmp, 0);
|
|
if (*tmp != '\0') {
|
|
semantic_error("There is non-digit char"
|
|
" in line number.\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case '+': /* Byte offset from a symbol */
|
|
pp->offset = strtoul(arg, &tmp, 0);
|
|
if (*tmp != '\0') {
|
|
semantic_error("There is non-digit character"
|
|
" in offset.\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
case '@': /* File name */
|
|
if (pp->file) {
|
|
semantic_error("SRC@SRC is not allowed.\n");
|
|
return -EINVAL;
|
|
}
|
|
pp->file = strdup(arg);
|
|
if (pp->file == NULL)
|
|
return -ENOMEM;
|
|
break;
|
|
case '%': /* Probe places */
|
|
if (strcmp(arg, "return") == 0) {
|
|
pp->retprobe = 1;
|
|
} else { /* Others not supported yet */
|
|
semantic_error("%%%s is not supported.\n", arg);
|
|
return -ENOTSUP;
|
|
}
|
|
break;
|
|
default: /* Buggy case */
|
|
pr_err("This program has a bug at %s:%d.\n",
|
|
__FILE__, __LINE__);
|
|
return -ENOTSUP;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Exclusion check */
|
|
if (pp->lazy_line && pp->line) {
|
|
semantic_error("Lazy pattern can't be used with"
|
|
" line number.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pp->lazy_line && pp->offset) {
|
|
semantic_error("Lazy pattern can't be used with offset.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pp->line && pp->offset) {
|
|
semantic_error("Offset can't be used with line number.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
|
|
semantic_error("File always requires line number or "
|
|
"lazy pattern.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pp->offset && !pp->function) {
|
|
semantic_error("Offset requires an entry function.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pp->retprobe && !pp->function) {
|
|
semantic_error("Return probe requires an entry function.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
|
|
semantic_error("Offset/Line/Lazy pattern can't be used with "
|
|
"return probe.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("symbol:%s file:%s line:%d offset:%lu return:%d lazy:%s\n",
|
|
pp->function, pp->file, pp->line, pp->offset, pp->retprobe,
|
|
pp->lazy_line);
|
|
return 0;
|
|
}
|
|
|
|
/* Parse perf-probe event argument */
|
|
static int parse_perf_probe_arg(char *str, struct perf_probe_arg *arg)
|
|
{
|
|
char *tmp, *goodname;
|
|
struct perf_probe_arg_field **fieldp;
|
|
|
|
pr_debug("parsing arg: %s into ", str);
|
|
|
|
tmp = strchr(str, '=');
|
|
if (tmp) {
|
|
arg->name = strndup(str, tmp - str);
|
|
if (arg->name == NULL)
|
|
return -ENOMEM;
|
|
pr_debug("name:%s ", arg->name);
|
|
str = tmp + 1;
|
|
}
|
|
|
|
tmp = strchr(str, ':');
|
|
if (tmp) { /* Type setting */
|
|
*tmp = '\0';
|
|
arg->type = strdup(tmp + 1);
|
|
if (arg->type == NULL)
|
|
return -ENOMEM;
|
|
pr_debug("type:%s ", arg->type);
|
|
}
|
|
|
|
tmp = strpbrk(str, "-.[");
|
|
if (!is_c_varname(str) || !tmp) {
|
|
/* A variable, register, symbol or special value */
|
|
arg->var = strdup(str);
|
|
if (arg->var == NULL)
|
|
return -ENOMEM;
|
|
pr_debug("%s\n", arg->var);
|
|
return 0;
|
|
}
|
|
|
|
/* Structure fields or array element */
|
|
arg->var = strndup(str, tmp - str);
|
|
if (arg->var == NULL)
|
|
return -ENOMEM;
|
|
goodname = arg->var;
|
|
pr_debug("%s, ", arg->var);
|
|
fieldp = &arg->field;
|
|
|
|
do {
|
|
*fieldp = zalloc(sizeof(struct perf_probe_arg_field));
|
|
if (*fieldp == NULL)
|
|
return -ENOMEM;
|
|
if (*tmp == '[') { /* Array */
|
|
str = tmp;
|
|
(*fieldp)->index = strtol(str + 1, &tmp, 0);
|
|
(*fieldp)->ref = true;
|
|
if (*tmp != ']' || tmp == str + 1) {
|
|
semantic_error("Array index must be a"
|
|
" number.\n");
|
|
return -EINVAL;
|
|
}
|
|
tmp++;
|
|
if (*tmp == '\0')
|
|
tmp = NULL;
|
|
} else { /* Structure */
|
|
if (*tmp == '.') {
|
|
str = tmp + 1;
|
|
(*fieldp)->ref = false;
|
|
} else if (tmp[1] == '>') {
|
|
str = tmp + 2;
|
|
(*fieldp)->ref = true;
|
|
} else {
|
|
semantic_error("Argument parse error: %s\n",
|
|
str);
|
|
return -EINVAL;
|
|
}
|
|
tmp = strpbrk(str, "-.[");
|
|
}
|
|
if (tmp) {
|
|
(*fieldp)->name = strndup(str, tmp - str);
|
|
if ((*fieldp)->name == NULL)
|
|
return -ENOMEM;
|
|
if (*str != '[')
|
|
goodname = (*fieldp)->name;
|
|
pr_debug("%s(%d), ", (*fieldp)->name, (*fieldp)->ref);
|
|
fieldp = &(*fieldp)->next;
|
|
}
|
|
} while (tmp);
|
|
(*fieldp)->name = strdup(str);
|
|
if ((*fieldp)->name == NULL)
|
|
return -ENOMEM;
|
|
if (*str != '[')
|
|
goodname = (*fieldp)->name;
|
|
pr_debug("%s(%d)\n", (*fieldp)->name, (*fieldp)->ref);
|
|
|
|
/* If no name is specified, set the last field name (not array index)*/
|
|
if (!arg->name) {
|
|
arg->name = strdup(goodname);
|
|
if (arg->name == NULL)
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Parse perf-probe event command */
|
|
int parse_perf_probe_command(const char *cmd, struct perf_probe_event *pev)
|
|
{
|
|
char **argv;
|
|
int argc, i, ret = 0;
|
|
|
|
argv = argv_split(cmd, &argc);
|
|
if (!argv) {
|
|
pr_debug("Failed to split arguments.\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (argc - 1 > MAX_PROBE_ARGS) {
|
|
semantic_error("Too many probe arguments (%d).\n", argc - 1);
|
|
ret = -ERANGE;
|
|
goto out;
|
|
}
|
|
/* Parse probe point */
|
|
ret = parse_perf_probe_point(argv[0], pev);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* Copy arguments and ensure return probe has no C argument */
|
|
pev->nargs = argc - 1;
|
|
pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
|
|
if (pev->args == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
for (i = 0; i < pev->nargs && ret >= 0; i++) {
|
|
ret = parse_perf_probe_arg(argv[i + 1], &pev->args[i]);
|
|
if (ret >= 0 &&
|
|
is_c_varname(pev->args[i].var) && pev->point.retprobe) {
|
|
semantic_error("You can't specify local variable for"
|
|
" kretprobe.\n");
|
|
ret = -EINVAL;
|
|
}
|
|
}
|
|
out:
|
|
argv_free(argv);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Return true if this perf_probe_event requires debuginfo */
|
|
bool perf_probe_event_need_dwarf(struct perf_probe_event *pev)
|
|
{
|
|
int i;
|
|
|
|
if (pev->point.file || pev->point.line || pev->point.lazy_line)
|
|
return true;
|
|
|
|
for (i = 0; i < pev->nargs; i++)
|
|
if (is_c_varname(pev->args[i].var))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Parse probe_events event into struct probe_point */
|
|
static int parse_probe_trace_command(const char *cmd,
|
|
struct probe_trace_event *tev)
|
|
{
|
|
struct probe_trace_point *tp = &tev->point;
|
|
char pr;
|
|
char *p;
|
|
int ret, i, argc;
|
|
char **argv;
|
|
|
|
pr_debug("Parsing probe_events: %s\n", cmd);
|
|
argv = argv_split(cmd, &argc);
|
|
if (!argv) {
|
|
pr_debug("Failed to split arguments.\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (argc < 2) {
|
|
semantic_error("Too few probe arguments.\n");
|
|
ret = -ERANGE;
|
|
goto out;
|
|
}
|
|
|
|
/* Scan event and group name. */
|
|
ret = sscanf(argv[0], "%c:%a[^/ \t]/%a[^ \t]",
|
|
&pr, (float *)(void *)&tev->group,
|
|
(float *)(void *)&tev->event);
|
|
if (ret != 3) {
|
|
semantic_error("Failed to parse event name: %s\n", argv[0]);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
pr_debug("Group:%s Event:%s probe:%c\n", tev->group, tev->event, pr);
|
|
|
|
tp->retprobe = (pr == 'r');
|
|
|
|
/* Scan module name(if there), function name and offset */
|
|
p = strchr(argv[1], ':');
|
|
if (p) {
|
|
tp->module = strndup(argv[1], p - argv[1]);
|
|
p++;
|
|
} else
|
|
p = argv[1];
|
|
ret = sscanf(p, "%a[^+]+%lu", (float *)(void *)&tp->symbol,
|
|
&tp->offset);
|
|
if (ret == 1)
|
|
tp->offset = 0;
|
|
|
|
tev->nargs = argc - 2;
|
|
tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs);
|
|
if (tev->args == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
p = strchr(argv[i + 2], '=');
|
|
if (p) /* We don't need which register is assigned. */
|
|
*p++ = '\0';
|
|
else
|
|
p = argv[i + 2];
|
|
tev->args[i].name = strdup(argv[i + 2]);
|
|
/* TODO: parse regs and offset */
|
|
tev->args[i].value = strdup(p);
|
|
if (tev->args[i].name == NULL || tev->args[i].value == NULL) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
out:
|
|
argv_free(argv);
|
|
return ret;
|
|
}
|
|
|
|
/* Compose only probe arg */
|
|
int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
|
|
{
|
|
struct perf_probe_arg_field *field = pa->field;
|
|
int ret;
|
|
char *tmp = buf;
|
|
|
|
if (pa->name && pa->var)
|
|
ret = e_snprintf(tmp, len, "%s=%s", pa->name, pa->var);
|
|
else
|
|
ret = e_snprintf(tmp, len, "%s", pa->name ? pa->name : pa->var);
|
|
if (ret <= 0)
|
|
goto error;
|
|
tmp += ret;
|
|
len -= ret;
|
|
|
|
while (field) {
|
|
if (field->name[0] == '[')
|
|
ret = e_snprintf(tmp, len, "%s", field->name);
|
|
else
|
|
ret = e_snprintf(tmp, len, "%s%s",
|
|
field->ref ? "->" : ".", field->name);
|
|
if (ret <= 0)
|
|
goto error;
|
|
tmp += ret;
|
|
len -= ret;
|
|
field = field->next;
|
|
}
|
|
|
|
if (pa->type) {
|
|
ret = e_snprintf(tmp, len, ":%s", pa->type);
|
|
if (ret <= 0)
|
|
goto error;
|
|
tmp += ret;
|
|
len -= ret;
|
|
}
|
|
|
|
return tmp - buf;
|
|
error:
|
|
pr_debug("Failed to synthesize perf probe argument: %s\n",
|
|
strerror(-ret));
|
|
return ret;
|
|
}
|
|
|
|
/* Compose only probe point (not argument) */
|
|
static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
|
|
{
|
|
char *buf, *tmp;
|
|
char offs[32] = "", line[32] = "", file[32] = "";
|
|
int ret, len;
|
|
|
|
buf = zalloc(MAX_CMDLEN);
|
|
if (buf == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
if (pp->offset) {
|
|
ret = e_snprintf(offs, 32, "+%lu", pp->offset);
|
|
if (ret <= 0)
|
|
goto error;
|
|
}
|
|
if (pp->line) {
|
|
ret = e_snprintf(line, 32, ":%d", pp->line);
|
|
if (ret <= 0)
|
|
goto error;
|
|
}
|
|
if (pp->file) {
|
|
tmp = pp->file;
|
|
len = strlen(tmp);
|
|
if (len > 30) {
|
|
tmp = strchr(pp->file + len - 30, '/');
|
|
tmp = tmp ? tmp + 1 : pp->file + len - 30;
|
|
}
|
|
ret = e_snprintf(file, 32, "@%s", tmp);
|
|
if (ret <= 0)
|
|
goto error;
|
|
}
|
|
|
|
if (pp->function)
|
|
ret = e_snprintf(buf, MAX_CMDLEN, "%s%s%s%s%s", pp->function,
|
|
offs, pp->retprobe ? "%return" : "", line,
|
|
file);
|
|
else
|
|
ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", file, line);
|
|
if (ret <= 0)
|
|
goto error;
|
|
|
|
return buf;
|
|
error:
|
|
pr_debug("Failed to synthesize perf probe point: %s\n",
|
|
strerror(-ret));
|
|
if (buf)
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
#if 0
|
|
char *synthesize_perf_probe_command(struct perf_probe_event *pev)
|
|
{
|
|
char *buf;
|
|
int i, len, ret;
|
|
|
|
buf = synthesize_perf_probe_point(&pev->point);
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
len = strlen(buf);
|
|
for (i = 0; i < pev->nargs; i++) {
|
|
ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
|
|
pev->args[i].name);
|
|
if (ret <= 0) {
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
len += ret;
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
#endif
|
|
|
|
static int __synthesize_probe_trace_arg_ref(struct probe_trace_arg_ref *ref,
|
|
char **buf, size_t *buflen,
|
|
int depth)
|
|
{
|
|
int ret;
|
|
if (ref->next) {
|
|
depth = __synthesize_probe_trace_arg_ref(ref->next, buf,
|
|
buflen, depth + 1);
|
|
if (depth < 0)
|
|
goto out;
|
|
}
|
|
|
|
ret = e_snprintf(*buf, *buflen, "%+ld(", ref->offset);
|
|
if (ret < 0)
|
|
depth = ret;
|
|
else {
|
|
*buf += ret;
|
|
*buflen -= ret;
|
|
}
|
|
out:
|
|
return depth;
|
|
|
|
}
|
|
|
|
static int synthesize_probe_trace_arg(struct probe_trace_arg *arg,
|
|
char *buf, size_t buflen)
|
|
{
|
|
struct probe_trace_arg_ref *ref = arg->ref;
|
|
int ret, depth = 0;
|
|
char *tmp = buf;
|
|
|
|
/* Argument name or separator */
|
|
if (arg->name)
|
|
ret = e_snprintf(buf, buflen, " %s=", arg->name);
|
|
else
|
|
ret = e_snprintf(buf, buflen, " ");
|
|
if (ret < 0)
|
|
return ret;
|
|
buf += ret;
|
|
buflen -= ret;
|
|
|
|
/* Special case: @XXX */
|
|
if (arg->value[0] == '@' && arg->ref)
|
|
ref = ref->next;
|
|
|
|
/* Dereferencing arguments */
|
|
if (ref) {
|
|
depth = __synthesize_probe_trace_arg_ref(ref, &buf,
|
|
&buflen, 1);
|
|
if (depth < 0)
|
|
return depth;
|
|
}
|
|
|
|
/* Print argument value */
|
|
if (arg->value[0] == '@' && arg->ref)
|
|
ret = e_snprintf(buf, buflen, "%s%+ld", arg->value,
|
|
arg->ref->offset);
|
|
else
|
|
ret = e_snprintf(buf, buflen, "%s", arg->value);
|
|
if (ret < 0)
|
|
return ret;
|
|
buf += ret;
|
|
buflen -= ret;
|
|
|
|
/* Closing */
|
|
while (depth--) {
|
|
ret = e_snprintf(buf, buflen, ")");
|
|
if (ret < 0)
|
|
return ret;
|
|
buf += ret;
|
|
buflen -= ret;
|
|
}
|
|
/* Print argument type */
|
|
if (arg->type) {
|
|
ret = e_snprintf(buf, buflen, ":%s", arg->type);
|
|
if (ret <= 0)
|
|
return ret;
|
|
buf += ret;
|
|
}
|
|
|
|
return buf - tmp;
|
|
}
|
|
|
|
char *synthesize_probe_trace_command(struct probe_trace_event *tev)
|
|
{
|
|
struct probe_trace_point *tp = &tev->point;
|
|
char *buf;
|
|
int i, len, ret;
|
|
|
|
buf = zalloc(MAX_CMDLEN);
|
|
if (buf == NULL)
|
|
return NULL;
|
|
|
|
len = e_snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s%s%s+%lu",
|
|
tp->retprobe ? 'r' : 'p',
|
|
tev->group, tev->event,
|
|
tp->module ?: "", tp->module ? ":" : "",
|
|
tp->symbol, tp->offset);
|
|
if (len <= 0)
|
|
goto error;
|
|
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
ret = synthesize_probe_trace_arg(&tev->args[i], buf + len,
|
|
MAX_CMDLEN - len);
|
|
if (ret <= 0)
|
|
goto error;
|
|
len += ret;
|
|
}
|
|
|
|
return buf;
|
|
error:
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
static int convert_to_perf_probe_event(struct probe_trace_event *tev,
|
|
struct perf_probe_event *pev)
|
|
{
|
|
char buf[64] = "";
|
|
int i, ret;
|
|
|
|
/* Convert event/group name */
|
|
pev->event = strdup(tev->event);
|
|
pev->group = strdup(tev->group);
|
|
if (pev->event == NULL || pev->group == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* Convert trace_point to probe_point */
|
|
ret = kprobe_convert_to_perf_probe(&tev->point, &pev->point);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Convert trace_arg to probe_arg */
|
|
pev->nargs = tev->nargs;
|
|
pev->args = zalloc(sizeof(struct perf_probe_arg) * pev->nargs);
|
|
if (pev->args == NULL)
|
|
return -ENOMEM;
|
|
for (i = 0; i < tev->nargs && ret >= 0; i++) {
|
|
if (tev->args[i].name)
|
|
pev->args[i].name = strdup(tev->args[i].name);
|
|
else {
|
|
ret = synthesize_probe_trace_arg(&tev->args[i],
|
|
buf, 64);
|
|
pev->args[i].name = strdup(buf);
|
|
}
|
|
if (pev->args[i].name == NULL && ret >= 0)
|
|
ret = -ENOMEM;
|
|
}
|
|
|
|
if (ret < 0)
|
|
clear_perf_probe_event(pev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void clear_perf_probe_event(struct perf_probe_event *pev)
|
|
{
|
|
struct perf_probe_point *pp = &pev->point;
|
|
struct perf_probe_arg_field *field, *next;
|
|
int i;
|
|
|
|
if (pev->event)
|
|
free(pev->event);
|
|
if (pev->group)
|
|
free(pev->group);
|
|
if (pp->file)
|
|
free(pp->file);
|
|
if (pp->function)
|
|
free(pp->function);
|
|
if (pp->lazy_line)
|
|
free(pp->lazy_line);
|
|
for (i = 0; i < pev->nargs; i++) {
|
|
if (pev->args[i].name)
|
|
free(pev->args[i].name);
|
|
if (pev->args[i].var)
|
|
free(pev->args[i].var);
|
|
if (pev->args[i].type)
|
|
free(pev->args[i].type);
|
|
field = pev->args[i].field;
|
|
while (field) {
|
|
next = field->next;
|
|
if (field->name)
|
|
free(field->name);
|
|
free(field);
|
|
field = next;
|
|
}
|
|
}
|
|
if (pev->args)
|
|
free(pev->args);
|
|
memset(pev, 0, sizeof(*pev));
|
|
}
|
|
|
|
static void clear_probe_trace_event(struct probe_trace_event *tev)
|
|
{
|
|
struct probe_trace_arg_ref *ref, *next;
|
|
int i;
|
|
|
|
if (tev->event)
|
|
free(tev->event);
|
|
if (tev->group)
|
|
free(tev->group);
|
|
if (tev->point.symbol)
|
|
free(tev->point.symbol);
|
|
if (tev->point.module)
|
|
free(tev->point.module);
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
if (tev->args[i].name)
|
|
free(tev->args[i].name);
|
|
if (tev->args[i].value)
|
|
free(tev->args[i].value);
|
|
if (tev->args[i].type)
|
|
free(tev->args[i].type);
|
|
ref = tev->args[i].ref;
|
|
while (ref) {
|
|
next = ref->next;
|
|
free(ref);
|
|
ref = next;
|
|
}
|
|
}
|
|
if (tev->args)
|
|
free(tev->args);
|
|
memset(tev, 0, sizeof(*tev));
|
|
}
|
|
|
|
static int open_kprobe_events(bool readwrite)
|
|
{
|
|
char buf[PATH_MAX];
|
|
const char *__debugfs;
|
|
int ret;
|
|
|
|
__debugfs = debugfs_find_mountpoint();
|
|
if (__debugfs == NULL) {
|
|
pr_warning("Debugfs is not mounted.\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
ret = e_snprintf(buf, PATH_MAX, "%stracing/kprobe_events", __debugfs);
|
|
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);
|
|
else
|
|
ret = open(buf, O_RDONLY, 0);
|
|
}
|
|
|
|
if (ret < 0) {
|
|
if (errno == ENOENT)
|
|
pr_warning("kprobe_events file does not exist - please"
|
|
" rebuild kernel with CONFIG_KPROBE_EVENT.\n");
|
|
else
|
|
pr_warning("Failed to open kprobe_events file: %s\n",
|
|
strerror(errno));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Get raw string list of current kprobe_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(true, 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: %s\n", strerror(-ret));
|
|
strlist__delete(sl);
|
|
return NULL;
|
|
}
|
|
}
|
|
fclose(fp);
|
|
|
|
return sl;
|
|
}
|
|
|
|
/* Show an event */
|
|
static int show_perf_probe_event(struct perf_probe_event *pev)
|
|
{
|
|
int i, ret;
|
|
char buf[128];
|
|
char *place;
|
|
|
|
/* Synthesize only event probe point */
|
|
place = synthesize_perf_probe_point(&pev->point);
|
|
if (!place)
|
|
return -EINVAL;
|
|
|
|
ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
printf(" %-20s (on %s", buf, place);
|
|
|
|
if (pev->nargs > 0) {
|
|
printf(" with");
|
|
for (i = 0; i < pev->nargs; i++) {
|
|
ret = synthesize_perf_probe_arg(&pev->args[i],
|
|
buf, 128);
|
|
if (ret < 0)
|
|
break;
|
|
printf(" %s", buf);
|
|
}
|
|
}
|
|
printf(")\n");
|
|
free(place);
|
|
return ret;
|
|
}
|
|
|
|
/* List up current perf-probe events */
|
|
int show_perf_probe_events(void)
|
|
{
|
|
int fd, ret;
|
|
struct probe_trace_event tev;
|
|
struct perf_probe_event pev;
|
|
struct strlist *rawlist;
|
|
struct str_node *ent;
|
|
|
|
setup_pager();
|
|
ret = init_vmlinux();
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
memset(&tev, 0, sizeof(tev));
|
|
memset(&pev, 0, sizeof(pev));
|
|
|
|
fd = open_kprobe_events(false);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
rawlist = get_probe_trace_command_rawlist(fd);
|
|
close(fd);
|
|
if (!rawlist)
|
|
return -ENOENT;
|
|
|
|
strlist__for_each(ent, rawlist) {
|
|
ret = parse_probe_trace_command(ent->s, &tev);
|
|
if (ret >= 0) {
|
|
ret = convert_to_perf_probe_event(&tev, &pev);
|
|
if (ret >= 0)
|
|
ret = show_perf_probe_event(&pev);
|
|
}
|
|
clear_perf_probe_event(&pev);
|
|
clear_probe_trace_event(&tev);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
strlist__delete(rawlist);
|
|
|
|
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);
|
|
sl = strlist__new(true, 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);
|
|
|
|
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)
|
|
pr_warning("Failed to write event: %s\n",
|
|
strerror(errno));
|
|
}
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static int get_new_event_name(char *buf, size_t len, const char *base,
|
|
struct strlist *namelist, bool allow_suffix)
|
|
{
|
|
int i, ret;
|
|
|
|
/* Try no suffix */
|
|
ret = e_snprintf(buf, len, "%s", base);
|
|
if (ret < 0) {
|
|
pr_debug("snprintf() failed: %s\n", strerror(-ret));
|
|
return ret;
|
|
}
|
|
if (!strlist__has_entry(namelist, buf))
|
|
return 0;
|
|
|
|
if (!allow_suffix) {
|
|
pr_warning("Error: event \"%s\" already exists. "
|
|
"(Use -f to force duplicates.)\n", base);
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* Try to add suffix */
|
|
for (i = 1; i < MAX_EVENT_INDEX; i++) {
|
|
ret = e_snprintf(buf, len, "%s_%d", base, i);
|
|
if (ret < 0) {
|
|
pr_debug("snprintf() failed: %s\n", strerror(-ret));
|
|
return ret;
|
|
}
|
|
if (!strlist__has_entry(namelist, buf))
|
|
break;
|
|
}
|
|
if (i == MAX_EVENT_INDEX) {
|
|
pr_warning("Too many events are on the same function.\n");
|
|
ret = -ERANGE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __add_probe_trace_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event *tevs,
|
|
int ntevs, bool allow_suffix)
|
|
{
|
|
int i, fd, ret;
|
|
struct probe_trace_event *tev = NULL;
|
|
char buf[64];
|
|
const char *event, *group;
|
|
struct strlist *namelist;
|
|
|
|
fd = open_kprobe_events(true);
|
|
if (fd < 0)
|
|
return fd;
|
|
/* Get current event names */
|
|
namelist = get_probe_trace_event_names(fd, false);
|
|
if (!namelist) {
|
|
pr_debug("Failed to get current event list.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
ret = 0;
|
|
printf("Add new event%s\n", (ntevs > 1) ? "s:" : ":");
|
|
for (i = 0; i < ntevs; i++) {
|
|
tev = &tevs[i];
|
|
if (pev->event)
|
|
event = pev->event;
|
|
else
|
|
if (pev->point.function)
|
|
event = pev->point.function;
|
|
else
|
|
event = tev->point.symbol;
|
|
if (pev->group)
|
|
group = pev->group;
|
|
else
|
|
group = PERFPROBE_GROUP;
|
|
|
|
/* Get an unused new event name */
|
|
ret = get_new_event_name(buf, 64, event,
|
|
namelist, allow_suffix);
|
|
if (ret < 0)
|
|
break;
|
|
event = buf;
|
|
|
|
tev->event = strdup(event);
|
|
tev->group = strdup(group);
|
|
if (tev->event == NULL || tev->group == NULL) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
ret = write_probe_trace_event(fd, tev);
|
|
if (ret < 0)
|
|
break;
|
|
/* Add added event name to namelist */
|
|
strlist__add(namelist, event);
|
|
|
|
/* Trick here - save current event/group */
|
|
event = pev->event;
|
|
group = pev->group;
|
|
pev->event = tev->event;
|
|
pev->group = tev->group;
|
|
show_perf_probe_event(pev);
|
|
/* Trick here - restore current event/group */
|
|
pev->event = (char *)event;
|
|
pev->group = (char *)group;
|
|
|
|
/*
|
|
* Probes after the first probe which comes from same
|
|
* user input are always allowed to add suffix, because
|
|
* there might be several addresses corresponding to
|
|
* one code line.
|
|
*/
|
|
allow_suffix = true;
|
|
}
|
|
|
|
if (ret >= 0) {
|
|
/* Show how to use the event. */
|
|
printf("\nYou can now use it on all perf tools, such as:\n\n");
|
|
printf("\tperf record -e %s:%s -aR sleep 1\n\n", tev->group,
|
|
tev->event);
|
|
}
|
|
|
|
strlist__delete(namelist);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
static int convert_to_probe_trace_events(struct perf_probe_event *pev,
|
|
struct probe_trace_event **tevs,
|
|
int max_tevs, const char *module)
|
|
{
|
|
struct symbol *sym;
|
|
int ret = 0, i;
|
|
struct probe_trace_event *tev;
|
|
|
|
/* Convert perf_probe_event with debuginfo */
|
|
ret = try_to_find_probe_trace_events(pev, tevs, max_tevs, module);
|
|
if (ret != 0)
|
|
return ret; /* Found in debuginfo or got an error */
|
|
|
|
/* Allocate trace event buffer */
|
|
tev = *tevs = zalloc(sizeof(struct probe_trace_event));
|
|
if (tev == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* Copy parameters */
|
|
tev->point.symbol = strdup(pev->point.function);
|
|
if (tev->point.symbol == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
tev->point.module = strdup(module);
|
|
if (tev->point.module == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
tev->point.offset = pev->point.offset;
|
|
tev->point.retprobe = pev->point.retprobe;
|
|
tev->nargs = pev->nargs;
|
|
if (tev->nargs) {
|
|
tev->args = zalloc(sizeof(struct probe_trace_arg)
|
|
* tev->nargs);
|
|
if (tev->args == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
for (i = 0; i < tev->nargs; i++) {
|
|
if (pev->args[i].name) {
|
|
tev->args[i].name = strdup(pev->args[i].name);
|
|
if (tev->args[i].name == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
}
|
|
tev->args[i].value = strdup(pev->args[i].var);
|
|
if (tev->args[i].value == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
if (pev->args[i].type) {
|
|
tev->args[i].type = strdup(pev->args[i].type);
|
|
if (tev->args[i].type == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Currently just checking function name from symbol map */
|
|
sym = __find_kernel_function_by_name(tev->point.symbol, NULL);
|
|
if (!sym) {
|
|
pr_warning("Kernel symbol \'%s\' not found.\n",
|
|
tev->point.symbol);
|
|
ret = -ENOENT;
|
|
goto error;
|
|
}
|
|
|
|
return 1;
|
|
error:
|
|
clear_probe_trace_event(tev);
|
|
free(tev);
|
|
*tevs = NULL;
|
|
return ret;
|
|
}
|
|
|
|
struct __event_package {
|
|
struct perf_probe_event *pev;
|
|
struct probe_trace_event *tevs;
|
|
int ntevs;
|
|
};
|
|
|
|
int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
|
|
int max_tevs, const char *module, bool force_add)
|
|
{
|
|
int i, j, ret;
|
|
struct __event_package *pkgs;
|
|
|
|
pkgs = zalloc(sizeof(struct __event_package) * npevs);
|
|
if (pkgs == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* Init vmlinux path */
|
|
ret = init_vmlinux();
|
|
if (ret < 0) {
|
|
free(pkgs);
|
|
return ret;
|
|
}
|
|
|
|
/* Loop 1: convert all events */
|
|
for (i = 0; i < npevs; i++) {
|
|
pkgs[i].pev = &pevs[i];
|
|
/* Convert with or without debuginfo */
|
|
ret = convert_to_probe_trace_events(pkgs[i].pev,
|
|
&pkgs[i].tevs,
|
|
max_tevs,
|
|
module);
|
|
if (ret < 0)
|
|
goto end;
|
|
pkgs[i].ntevs = ret;
|
|
}
|
|
|
|
/* Loop 2: add all events */
|
|
for (i = 0; i < npevs; i++) {
|
|
ret = __add_probe_trace_events(pkgs[i].pev, pkgs[i].tevs,
|
|
pkgs[i].ntevs, force_add);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
end:
|
|
/* Loop 3: cleanup and free trace events */
|
|
for (i = 0; i < npevs; i++) {
|
|
for (j = 0; j < pkgs[i].ntevs; j++)
|
|
clear_probe_trace_event(&pkgs[i].tevs[j]);
|
|
free(pkgs[i].tevs);
|
|
}
|
|
free(pkgs);
|
|
|
|
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)
|
|
goto error;
|
|
|
|
printf("Remove event: %s\n", ent->s);
|
|
return 0;
|
|
error:
|
|
pr_warning("Failed to delete event: %s\n", strerror(-ret));
|
|
return ret;
|
|
}
|
|
|
|
static int del_trace_probe_event(int fd, const char *group,
|
|
const char *event, struct strlist *namelist)
|
|
{
|
|
char buf[128];
|
|
struct str_node *ent, *n;
|
|
int found = 0, ret = 0;
|
|
|
|
ret = e_snprintf(buf, 128, "%s:%s", group, event);
|
|
if (ret < 0) {
|
|
pr_err("Failed to copy event.\n");
|
|
return ret;
|
|
}
|
|
|
|
if (strpbrk(buf, "*?")) { /* Glob-exp */
|
|
strlist__for_each_safe(ent, n, namelist)
|
|
if (strglobmatch(ent->s, buf)) {
|
|
found++;
|
|
ret = __del_trace_probe_event(fd, ent);
|
|
if (ret < 0)
|
|
break;
|
|
strlist__remove(namelist, ent);
|
|
}
|
|
} else {
|
|
ent = strlist__find(namelist, buf);
|
|
if (ent) {
|
|
found++;
|
|
ret = __del_trace_probe_event(fd, ent);
|
|
if (ret >= 0)
|
|
strlist__remove(namelist, ent);
|
|
}
|
|
}
|
|
if (found == 0 && ret >= 0)
|
|
pr_info("Info: Event \"%s\" does not exist.\n", buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int del_perf_probe_events(struct strlist *dellist)
|
|
{
|
|
int fd, ret = 0;
|
|
const char *group, *event;
|
|
char *p, *str;
|
|
struct str_node *ent;
|
|
struct strlist *namelist;
|
|
|
|
fd = open_kprobe_events(true);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
/* Get current event names */
|
|
namelist = get_probe_trace_event_names(fd, true);
|
|
if (namelist == NULL)
|
|
return -EINVAL;
|
|
|
|
strlist__for_each(ent, dellist) {
|
|
str = strdup(ent->s);
|
|
if (str == NULL) {
|
|
ret = -ENOMEM;
|
|
break;
|
|
}
|
|
pr_debug("Parsing: %s\n", str);
|
|
p = strchr(str, ':');
|
|
if (p) {
|
|
group = str;
|
|
*p = '\0';
|
|
event = p + 1;
|
|
} else {
|
|
group = "*";
|
|
event = str;
|
|
}
|
|
pr_debug("Group: %s, Event: %s\n", group, event);
|
|
ret = del_trace_probe_event(fd, group, event, namelist);
|
|
free(str);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
strlist__delete(namelist);
|
|
close(fd);
|
|
|
|
return ret;
|
|
}
|
|
/* TODO: don't use a global variable for filter ... */
|
|
static struct strfilter *available_func_filter;
|
|
|
|
/*
|
|
* If a symbol corresponds to a function with global binding and
|
|
* matches filter return 0. For all others return 1.
|
|
*/
|
|
static int filter_available_functions(struct map *map __unused,
|
|
struct symbol *sym)
|
|
{
|
|
if (sym->binding == STB_GLOBAL &&
|
|
strfilter__compare(available_func_filter, sym->name))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
int show_available_funcs(const char *module, struct strfilter *_filter)
|
|
{
|
|
struct map *map;
|
|
int ret;
|
|
|
|
setup_pager();
|
|
|
|
ret = init_vmlinux();
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
map = kernel_get_module_map(module);
|
|
if (!map) {
|
|
pr_err("Failed to find %s map.\n", (module) ? : "kernel");
|
|
return -EINVAL;
|
|
}
|
|
available_func_filter = _filter;
|
|
if (map__load(map, filter_available_functions)) {
|
|
pr_err("Failed to load map.\n");
|
|
return -EINVAL;
|
|
}
|
|
if (!dso__sorted_by_name(map->dso, map->type))
|
|
dso__sort_by_name(map->dso, map->type);
|
|
|
|
dso__fprintf_symbols_by_name(map->dso, map->type, stdout);
|
|
return 0;
|
|
}
|