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![Athira Rajeev](/assets/img/avatar_default.png)
While parsing the tracepoint events in parse_events_add_tracepoint() function, code checks for HAVE_LIBTRACEEVENT support. This is needed since libtraceevent is necessary for tracepoint. But while adding probe points, check for LIBTRACEEVENT is not done in case of perf probe. Hence, in environment with missing libtraceevent-devel, it is observed that adding a probe point shows below message though it can't be used via perf record. Example: Adding probe point: ./perf probe 'vfs_getname=getname_flags:72 pathname=result->name:string' Added new event: probe:vfs_getname (on getname_flags:72 with pathname=result->name:string) You can now use it in all perf tools, such as: perf record -e probe:vfs_getname -aR sleep 1 But trying perf record: ./perf record -e probe:vfs_getname -aR sleep 1 event syntax error: 'probe:vfs_getname' \___ unsupported tracepoint libtraceevent is necessary for tracepoint support Run 'perf list' for a list of valid events The builtin tool like perf record needs libtraceevent to parse tracefs. But still the probe can be used by enabling via tracefs. Patch fixes the probe usage message to the user based on presence of libtraceevent. With the fix, # ./perf probe 'pmu:myprobe=schedule' Added new event: pmu:myprobe (on schedule) perf is not linked with libtraceevent, to use the new probe you can use tracefs: cd /sys/kernel/tracing/ echo 1 > events/pmu/myprobe/enable echo 1 > tracing_on cat trace_pipe Before removing the probe, echo 0 > events/pmu/myprobe/enable Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Disha Goel <disgoel@linux.ibm.com> Cc: Ian Rogers <irogers@google.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kajol Jain <kjain@linux.ibm.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nageswara R Sastry <rnsastry@linux.ibm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: linuxppc-dev@lists.ozlabs.org Link: https://lore.kernel.org/r/20230131134748.54567-1-atrajeev@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
762 lines
19 KiB
C
762 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* builtin-probe.c
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*
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* Builtin probe command: Set up probe events by C expression
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*/
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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 "builtin.h"
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#include "namespaces.h"
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#include "util/build-id.h"
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#include "util/strlist.h"
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#include "util/strfilter.h"
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#include "util/symbol.h"
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#include "util/symbol_conf.h"
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#include "util/debug.h"
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#include <subcmd/parse-options.h>
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#include "util/probe-finder.h"
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#include "util/probe-event.h"
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#include "util/probe-file.h"
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#include <linux/string.h>
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#include <linux/zalloc.h>
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#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
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#define DEFAULT_FUNC_FILTER "!_* & !*@plt"
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#define DEFAULT_LIST_FILTER "*"
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/* Session management structure */
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static struct {
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int command; /* Command short_name */
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bool list_events;
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bool uprobes;
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bool target_used;
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int nevents;
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struct perf_probe_event events[MAX_PROBES];
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struct line_range line_range;
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char *target;
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struct strfilter *filter;
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struct nsinfo *nsi;
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} params;
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/* Parse an event definition. Note that any error must die. */
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static int parse_probe_event(const char *str)
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{
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struct perf_probe_event *pev = ¶ms.events[params.nevents];
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int ret;
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pr_debug("probe-definition(%d): %s\n", params.nevents, str);
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if (++params.nevents == MAX_PROBES) {
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pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
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return -1;
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}
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pev->uprobes = params.uprobes;
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if (params.target) {
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pev->target = strdup(params.target);
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if (!pev->target)
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return -ENOMEM;
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params.target_used = true;
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}
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pev->nsi = nsinfo__get(params.nsi);
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/* Parse a perf-probe command into event */
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ret = parse_perf_probe_command(str, pev);
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pr_debug("%d arguments\n", pev->nargs);
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return ret;
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}
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static int params_add_filter(const char *str)
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{
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const char *err = NULL;
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int ret = 0;
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pr_debug2("Add filter: %s\n", str);
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if (!params.filter) {
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params.filter = strfilter__new(str, &err);
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if (!params.filter)
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ret = err ? -EINVAL : -ENOMEM;
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} else
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ret = strfilter__or(params.filter, str, &err);
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if (ret == -EINVAL) {
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pr_err("Filter parse error at %td.\n", err - str + 1);
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pr_err("Source: \"%s\"\n", str);
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pr_err(" %*c\n", (int)(err - str + 1), '^');
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}
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return ret;
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}
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static int set_target(const char *ptr)
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{
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int found = 0;
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const char *buf;
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/*
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* The first argument after options can be an absolute path
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* to an executable / library or kernel module.
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*
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* TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
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* short module name.
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*/
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if (!params.target && ptr && *ptr == '/') {
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params.target = strdup(ptr);
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if (!params.target)
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return -ENOMEM;
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params.target_used = false;
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found = 1;
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buf = ptr + (strlen(ptr) - 3);
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if (strcmp(buf, ".ko"))
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params.uprobes = true;
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}
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return found;
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}
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static int parse_probe_event_argv(int argc, const char **argv)
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{
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int i, len, ret, found_target;
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char *buf;
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found_target = set_target(argv[0]);
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if (found_target < 0)
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return found_target;
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if (found_target && argc == 1)
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return 0;
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/* Bind up rest arguments */
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len = 0;
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for (i = 0; i < argc; i++) {
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if (i == 0 && found_target)
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continue;
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len += strlen(argv[i]) + 1;
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}
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buf = zalloc(len + 1);
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if (buf == NULL)
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return -ENOMEM;
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len = 0;
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for (i = 0; i < argc; i++) {
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if (i == 0 && found_target)
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continue;
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len += sprintf(&buf[len], "%s ", argv[i]);
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}
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ret = parse_probe_event(buf);
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free(buf);
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return ret;
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}
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static int opt_set_target(const struct option *opt, const char *str,
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int unset __maybe_unused)
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{
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int ret = -ENOENT;
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char *tmp;
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if (str) {
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if (!strcmp(opt->long_name, "exec"))
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params.uprobes = true;
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else if (!strcmp(opt->long_name, "module"))
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params.uprobes = false;
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else
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return ret;
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/* Expand given path to absolute path, except for modulename */
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if (params.uprobes || strchr(str, '/')) {
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tmp = nsinfo__realpath(str, params.nsi);
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if (!tmp) {
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pr_warning("Failed to get the absolute path of %s: %m\n", str);
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return ret;
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}
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} else {
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tmp = strdup(str);
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if (!tmp)
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return -ENOMEM;
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}
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free(params.target);
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params.target = tmp;
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params.target_used = false;
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ret = 0;
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}
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return ret;
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}
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static int opt_set_target_ns(const struct option *opt __maybe_unused,
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const char *str, int unset __maybe_unused)
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{
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int ret = -ENOENT;
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pid_t ns_pid;
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struct nsinfo *nsip;
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if (str) {
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errno = 0;
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ns_pid = (pid_t)strtol(str, NULL, 10);
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if (errno != 0) {
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ret = -errno;
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pr_warning("Failed to parse %s as a pid: %s\n", str,
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strerror(errno));
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return ret;
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}
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nsip = nsinfo__new(ns_pid);
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if (nsip && nsinfo__need_setns(nsip))
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params.nsi = nsinfo__get(nsip);
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nsinfo__put(nsip);
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ret = 0;
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}
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return ret;
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}
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/* Command option callbacks */
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#ifdef HAVE_DWARF_SUPPORT
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static int opt_show_lines(const struct option *opt,
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const char *str, int unset __maybe_unused)
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{
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int ret = 0;
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if (!str)
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return 0;
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if (params.command == 'L') {
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pr_warning("Warning: more than one --line options are"
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" detected. Only the first one is valid.\n");
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return 0;
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}
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params.command = opt->short_name;
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ret = parse_line_range_desc(str, ¶ms.line_range);
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return ret;
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}
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static int opt_show_vars(const struct option *opt,
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const char *str, int unset __maybe_unused)
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{
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struct perf_probe_event *pev = ¶ms.events[params.nevents];
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int ret;
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if (!str)
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return 0;
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ret = parse_probe_event(str);
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if (!ret && pev->nargs != 0) {
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pr_err(" Error: '--vars' doesn't accept arguments.\n");
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return -EINVAL;
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}
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params.command = opt->short_name;
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return ret;
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}
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#else
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# define opt_show_lines NULL
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# define opt_show_vars NULL
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#endif
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static int opt_add_probe_event(const struct option *opt,
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const char *str, int unset __maybe_unused)
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{
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if (str) {
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params.command = opt->short_name;
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return parse_probe_event(str);
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}
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return 0;
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}
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static int opt_set_filter_with_command(const struct option *opt,
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const char *str, int unset)
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{
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if (!unset)
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params.command = opt->short_name;
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if (str)
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return params_add_filter(str);
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return 0;
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}
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static int opt_set_filter(const struct option *opt __maybe_unused,
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const char *str, int unset __maybe_unused)
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{
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if (str)
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return params_add_filter(str);
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return 0;
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}
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static int init_params(void)
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{
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return line_range__init(¶ms.line_range);
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}
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static void cleanup_params(void)
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{
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int i;
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for (i = 0; i < params.nevents; i++)
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clear_perf_probe_event(params.events + i);
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line_range__clear(¶ms.line_range);
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free(params.target);
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strfilter__delete(params.filter);
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nsinfo__put(params.nsi);
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memset(¶ms, 0, sizeof(params));
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}
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static void pr_err_with_code(const char *msg, int err)
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{
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char sbuf[STRERR_BUFSIZE];
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pr_err("%s", msg);
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pr_debug(" Reason: %s (Code: %d)",
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str_error_r(-err, sbuf, sizeof(sbuf)), err);
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pr_err("\n");
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}
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static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
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{
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int ret;
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int i, k;
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const char *event = NULL, *group = NULL;
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ret = init_probe_symbol_maps(pevs->uprobes);
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if (ret < 0)
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return ret;
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ret = convert_perf_probe_events(pevs, npevs);
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if (ret < 0)
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goto out_cleanup;
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if (params.command == 'D') { /* it shows definition */
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if (probe_conf.bootconfig)
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ret = show_bootconfig_events(pevs, npevs);
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else
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ret = show_probe_trace_events(pevs, npevs);
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goto out_cleanup;
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}
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ret = apply_perf_probe_events(pevs, npevs);
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if (ret < 0)
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goto out_cleanup;
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for (i = k = 0; i < npevs; i++)
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k += pevs[i].ntevs;
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pr_info("Added new event%s\n", (k > 1) ? "s:" : ":");
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for (i = 0; i < npevs; i++) {
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struct perf_probe_event *pev = &pevs[i];
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for (k = 0; k < pev->ntevs; k++) {
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struct probe_trace_event *tev = &pev->tevs[k];
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/* Skipped events have no event name */
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if (!tev->event)
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continue;
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/* We use tev's name for showing new events */
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show_perf_probe_event(tev->group, tev->event, pev,
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tev->point.module, false);
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/* Save the last valid name */
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event = tev->event;
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group = tev->group;
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}
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}
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/* Note that it is possible to skip all events because of blacklist */
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if (event) {
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#ifndef HAVE_LIBTRACEEVENT
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pr_info("\nperf is not linked with libtraceevent, to use the new probe you can use tracefs:\n\n");
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pr_info("\tcd /sys/kernel/tracing/\n");
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pr_info("\techo 1 > events/%s/%s/enable\n", group, event);
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pr_info("\techo 1 > tracing_on\n");
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pr_info("\tcat trace_pipe\n");
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pr_info("\tBefore removing the probe, echo 0 > events/%s/%s/enable\n", group, event);
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#else
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/* Show how to use the event. */
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pr_info("\nYou can now use it in all perf tools, such as:\n\n");
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pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
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#endif
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}
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out_cleanup:
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cleanup_perf_probe_events(pevs, npevs);
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exit_probe_symbol_maps();
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return ret;
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}
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static int del_perf_probe_caches(struct strfilter *filter)
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{
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struct probe_cache *cache;
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struct strlist *bidlist;
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struct str_node *nd;
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int ret;
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bidlist = build_id_cache__list_all(false);
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if (!bidlist) {
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ret = -errno;
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pr_debug("Failed to get buildids: %d\n", ret);
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return ret ?: -ENOMEM;
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}
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strlist__for_each_entry(nd, bidlist) {
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cache = probe_cache__new(nd->s, NULL);
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if (!cache)
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continue;
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if (probe_cache__filter_purge(cache, filter) < 0 ||
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probe_cache__commit(cache) < 0)
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pr_warning("Failed to remove entries for %s\n", nd->s);
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probe_cache__delete(cache);
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}
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return 0;
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}
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static int perf_del_probe_events(struct strfilter *filter)
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{
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int ret, ret2, ufd = -1, kfd = -1;
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char *str = strfilter__string(filter);
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struct strlist *klist = NULL, *ulist = NULL;
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struct str_node *ent;
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if (!str)
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return -EINVAL;
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pr_debug("Delete filter: \'%s\'\n", str);
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if (probe_conf.cache)
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return del_perf_probe_caches(filter);
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/* Get current event names */
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ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
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if (ret < 0)
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goto out;
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klist = strlist__new(NULL, NULL);
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ulist = strlist__new(NULL, NULL);
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if (!klist || !ulist) {
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ret = -ENOMEM;
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goto out;
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}
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ret = probe_file__get_events(kfd, filter, klist);
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if (ret == 0) {
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strlist__for_each_entry(ent, klist)
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pr_info("Removed event: %s\n", ent->s);
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ret = probe_file__del_strlist(kfd, klist);
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if (ret < 0)
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goto error;
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} else if (ret == -ENOMEM)
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goto error;
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ret2 = probe_file__get_events(ufd, filter, ulist);
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if (ret2 == 0) {
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strlist__for_each_entry(ent, ulist)
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pr_info("Removed event: %s\n", ent->s);
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ret2 = probe_file__del_strlist(ufd, ulist);
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if (ret2 < 0)
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goto error;
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} else if (ret2 == -ENOMEM)
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goto error;
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if (ret == -ENOENT && ret2 == -ENOENT)
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pr_warning("\"%s\" does not hit any event.\n", str);
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else
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ret = 0;
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error:
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if (kfd >= 0)
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close(kfd);
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if (ufd >= 0)
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close(ufd);
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out:
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strlist__delete(klist);
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strlist__delete(ulist);
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free(str);
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return ret;
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}
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#ifdef HAVE_DWARF_SUPPORT
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#define PROBEDEF_STR \
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"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT [[NAME=]ARG ...]"
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#else
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#define PROBEDEF_STR "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]"
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#endif
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static int
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__cmd_probe(int argc, const char **argv)
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{
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const char * const probe_usage[] = {
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"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
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"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
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"perf probe [<options>] --del '[GROUP:]EVENT' ...",
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"perf probe --list [GROUP:]EVENT ...",
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#ifdef HAVE_DWARF_SUPPORT
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"perf probe [<options>] --line 'LINEDESC'",
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"perf probe [<options>] --vars 'PROBEPOINT'",
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#endif
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"perf probe [<options>] --funcs",
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NULL
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};
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struct option options[] = {
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OPT_INCR('v', "verbose", &verbose,
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"be more verbose (show parsed arguments, etc)"),
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OPT_BOOLEAN('q', "quiet", &quiet,
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"be quiet (do not show any warnings or messages)"),
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OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
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"list up probe events",
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opt_set_filter_with_command, DEFAULT_LIST_FILTER),
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OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
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opt_set_filter_with_command),
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OPT_CALLBACK('a', "add", NULL, PROBEDEF_STR,
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"probe point definition, where\n"
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"\t\tGROUP:\tGroup name (optional)\n"
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"\t\tEVENT:\tEvent name\n"
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"\t\tFUNC:\tFunction name\n"
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"\t\tOFF:\tOffset from function entry (in byte)\n"
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"\t\t%return:\tPut the probe at function return\n"
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#ifdef HAVE_DWARF_SUPPORT
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"\t\tSRC:\tSource code path\n"
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"\t\tRL:\tRelative line number from function entry.\n"
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"\t\tAL:\tAbsolute line number in file.\n"
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"\t\tPT:\tLazy expression of line code.\n"
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"\t\tARG:\tProbe argument (local variable name or\n"
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"\t\t\tkprobe-tracer argument format.)\n",
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#else
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"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
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#endif
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opt_add_probe_event),
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OPT_CALLBACK('D', "definition", NULL, PROBEDEF_STR,
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"Show trace event definition of given traceevent for k/uprobe_events.",
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opt_add_probe_event),
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OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
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" with existing name"),
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OPT_CALLBACK('L', "line", NULL,
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"FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
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"Show source code lines.", opt_show_lines),
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OPT_CALLBACK('V', "vars", NULL,
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"FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
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"Show accessible variables on PROBEDEF", opt_show_vars),
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OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
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"Show external variables too (with --vars only)"),
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OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
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"Show variables location range in scope (with --vars only)"),
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OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
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"file", "vmlinux pathname"),
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OPT_STRING('s', "source", &symbol_conf.source_prefix,
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"directory", "path to kernel source"),
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OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
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"Don't search inlined functions"),
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OPT__DRY_RUN(&probe_event_dry_run),
|
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OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
|
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"Set how many probe points can be found for a probe."),
|
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OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
|
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"Show potential probe-able functions.",
|
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opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
|
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OPT_CALLBACK('\0', "filter", NULL,
|
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"[!]FILTER", "Set a filter (with --vars/funcs only)\n"
|
|
"\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
|
|
"\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
|
|
opt_set_filter),
|
|
OPT_CALLBACK('x', "exec", NULL, "executable|path",
|
|
"target executable name or path", opt_set_target),
|
|
OPT_CALLBACK('m', "module", NULL, "modname|path",
|
|
"target module name (for online) or path (for offline)",
|
|
opt_set_target),
|
|
OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
|
|
"Enable symbol demangling"),
|
|
OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
|
|
"Enable kernel symbol demangling"),
|
|
OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
|
|
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
|
|
"Look for files with symbols relative to this directory"),
|
|
OPT_CALLBACK(0, "target-ns", NULL, "pid",
|
|
"target pid for namespace contexts", opt_set_target_ns),
|
|
OPT_BOOLEAN(0, "bootconfig", &probe_conf.bootconfig,
|
|
"Output probe definition with bootconfig format"),
|
|
OPT_END()
|
|
};
|
|
int ret;
|
|
|
|
set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 'D', "definition", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
|
|
#ifdef HAVE_DWARF_SUPPORT
|
|
set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
|
|
#else
|
|
# define set_nobuild(s, l, c) set_option_nobuild(options, s, l, "NO_DWARF=1", c)
|
|
set_nobuild('L', "line", false);
|
|
set_nobuild('V', "vars", false);
|
|
set_nobuild('\0', "externs", false);
|
|
set_nobuild('\0', "range", false);
|
|
set_nobuild('k', "vmlinux", true);
|
|
set_nobuild('s', "source", true);
|
|
set_nobuild('\0', "no-inlines", true);
|
|
# undef set_nobuild
|
|
#endif
|
|
set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);
|
|
|
|
argc = parse_options(argc, argv, options, probe_usage,
|
|
PARSE_OPT_STOP_AT_NON_OPTION);
|
|
|
|
if (quiet) {
|
|
if (verbose != 0) {
|
|
pr_err(" Error: -v and -q are exclusive.\n");
|
|
return -EINVAL;
|
|
}
|
|
verbose = -1;
|
|
}
|
|
|
|
if (argc > 0) {
|
|
if (strcmp(argv[0], "-") == 0) {
|
|
usage_with_options_msg(probe_usage, options,
|
|
"'-' is not supported.\n");
|
|
}
|
|
if (params.command && params.command != 'a') {
|
|
usage_with_options_msg(probe_usage, options,
|
|
"another command except --add is set.\n");
|
|
}
|
|
ret = parse_probe_event_argv(argc, argv);
|
|
if (ret < 0) {
|
|
pr_err_with_code(" Error: Command Parse Error.", ret);
|
|
return ret;
|
|
}
|
|
params.command = 'a';
|
|
}
|
|
|
|
ret = symbol__validate_sym_arguments();
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (probe_conf.max_probes == 0)
|
|
probe_conf.max_probes = MAX_PROBES;
|
|
|
|
/*
|
|
* Only consider the user's kernel image path if given.
|
|
*/
|
|
symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
|
|
|
|
/*
|
|
* Except for --list, --del and --add, other command doesn't depend
|
|
* nor change running kernel. So if user gives offline vmlinux,
|
|
* ignore its buildid.
|
|
*/
|
|
if (!strchr("lda", params.command) && symbol_conf.vmlinux_name)
|
|
symbol_conf.ignore_vmlinux_buildid = true;
|
|
|
|
switch (params.command) {
|
|
case 'l':
|
|
if (params.uprobes) {
|
|
pr_err(" Error: Don't use --list with --exec.\n");
|
|
parse_options_usage(probe_usage, options, "l", true);
|
|
parse_options_usage(NULL, options, "x", true);
|
|
return -EINVAL;
|
|
}
|
|
ret = show_perf_probe_events(params.filter);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show event list.", ret);
|
|
return ret;
|
|
case 'F':
|
|
ret = show_available_funcs(params.target, params.nsi,
|
|
params.filter, params.uprobes);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show functions.", ret);
|
|
return ret;
|
|
#ifdef HAVE_DWARF_SUPPORT
|
|
case 'L':
|
|
ret = show_line_range(¶ms.line_range, params.target,
|
|
params.nsi, params.uprobes);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show lines.", ret);
|
|
return ret;
|
|
case 'V':
|
|
if (!params.filter)
|
|
params.filter = strfilter__new(DEFAULT_VAR_FILTER,
|
|
NULL);
|
|
|
|
ret = show_available_vars(params.events, params.nevents,
|
|
params.filter);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show vars.", ret);
|
|
return ret;
|
|
#endif
|
|
case 'd':
|
|
ret = perf_del_probe_events(params.filter);
|
|
if (ret < 0) {
|
|
pr_err_with_code(" Error: Failed to delete events.", ret);
|
|
return ret;
|
|
}
|
|
break;
|
|
case 'D':
|
|
if (probe_conf.bootconfig && params.uprobes) {
|
|
pr_err(" Error: --bootconfig doesn't support uprobes.\n");
|
|
return -EINVAL;
|
|
}
|
|
__fallthrough;
|
|
case 'a':
|
|
|
|
/* Ensure the last given target is used */
|
|
if (params.target && !params.target_used) {
|
|
pr_err(" Error: -x/-m must follow the probe definitions.\n");
|
|
parse_options_usage(probe_usage, options, "m", true);
|
|
parse_options_usage(NULL, options, "x", true);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = perf_add_probe_events(params.events, params.nevents);
|
|
if (ret < 0) {
|
|
|
|
/*
|
|
* When perf_add_probe_events() fails it calls
|
|
* cleanup_perf_probe_events(pevs, npevs), i.e.
|
|
* cleanup_perf_probe_events(params.events, params.nevents), which
|
|
* will call clear_perf_probe_event(), so set nevents to zero
|
|
* to avoid cleanup_params() to call clear_perf_probe_event() again
|
|
* on the same pevs.
|
|
*/
|
|
params.nevents = 0;
|
|
pr_err_with_code(" Error: Failed to add events.", ret);
|
|
return ret;
|
|
}
|
|
break;
|
|
default:
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int cmd_probe(int argc, const char **argv)
|
|
{
|
|
int ret;
|
|
|
|
ret = init_params();
|
|
if (!ret) {
|
|
ret = __cmd_probe(argc, argv);
|
|
cleanup_params();
|
|
}
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|