perf probe: Support multiple probes on different binaries

Support multiple probes on different binaries with just
one command.

In the result, this example sets up the probes on icmp_rcv in
kernel, on main and set_target in perf, and on pcspkr_event
in pcspker.ko driver.
  -----
  # perf probe -a icmp_rcv -x ./perf -a main -a set_target \
   -m /lib/modules/4.0.0-rc5+/kernel/drivers/input/misc/pcspkr.ko \
   -a pcspkr_event
  Added new event:
    probe:icmp_rcv       (on icmp_rcv)

  You can now use it in all perf tools, such as:

          perf record -e probe:icmp_rcv -aR sleep 1

  Added new event:
    probe_perf:main      (on main in /home/mhiramat/ksrc/linux-3/tools/perf/perf)

  You can now use it in all perf tools, such as:

          perf record -e probe_perf:main -aR sleep 1

  Added new event:
    probe_perf:set_target (on set_target in /home/mhiramat/ksrc/linux-3/tools/perf/perf)

  You can now use it in all perf tools, such as:

          perf record -e probe_perf:set_target -aR sleep 1

  Added new event:
    probe:pcspkr_event   (on pcspkr_event in pcspkr)

  You can now use it in all perf tools, such as:

          perf record -e probe:pcspkr_event -aR sleep 1
  -----

Reported-by: Arnaldo Carvalho de Melo <acme@infradead.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150401102539.17137.46454.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 13 insertions, 7 deletions

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 921bb6942503..2df23e177da5 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -78,6 +78,11 @@ static int parse_probe_event(const char *str)
         }
 
         pev->uprobes = params.uprobes;
+        if (params.target) {
+                pev->target = strdup(params.target);
+                if (!pev->target)
+                        return -ENOMEM;
+        }
 
         /* Parse a perf-probe command into event */
         ret = parse_perf_probe_command(str, pev);
@@ -178,7 +183,7 @@ static int opt_set_target(const struct option *opt, const char *str,
         int ret = -ENOENT;
         char *tmp;
 
-        if  (str && !params.target) {
+        if  (str) {
                 if (!strcmp(opt->long_name, "exec"))
                         params.uprobes = true;
 #ifdef HAVE_DWARF_SUPPORT
@@ -200,6 +205,7 @@ static int opt_set_target(const struct option *opt, const char *str,
                         if (!tmp)
                                 return -ENOMEM;
                 }
+                free(params.target);
                 params.target = tmp;
                 ret = 0;
         }
@@ -487,7 +493,6 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
         if (params.nevents) {
                 ret = add_perf_probe_events(params.events, params.nevents,
                                             params.max_probe_points,
-                                            params.target,
                                             params.force_add);
                 if (ret < 0) {
                         pr_err_with_code("  Error: Failed to add events.", ret);
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b78851732a71..30545ce2c712 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1906,6 +1906,7 @@ void clear_perf_probe_event(struct perf_probe_event *pev)
 
         free(pev->event);
         free(pev->group);
+        free(pev->target);
         clear_perf_probe_point(&pev->point);
 
         for (i = 0; i < pev->nargs; i++) {
@@ -2654,7 +2655,7 @@ struct __event_package {
 };
 
 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
-                          int max_tevs, const char *target, bool force_add)
+                          int max_tevs, bool force_add)
 {
         int i, j, ret;
         struct __event_package *pkgs;
@@ -2678,7 +2679,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
                 ret  = convert_to_probe_trace_events(pkgs[i].pev,
                                                      &pkgs[i].tevs,
                                                      max_tevs,
-                                                     target);
+                                                     pkgs[i].pev->target);
                 if (ret < 0)
                         goto end;
                 pkgs[i].ntevs = ret;
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index e01e9943139f..d6b783447be9 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -73,7 +73,8 @@ struct perf_probe_event {
         char                    *group; /* Group name */
         struct perf_probe_point point;  /* Probe point */
         int                     nargs;  /* Number of arguments */
-        bool                    uprobes;
+        bool                    uprobes;        /* Uprobe event flag */
+        char                    *target;        /* Target binary */
         struct perf_probe_arg   *args;  /* Arguments */
 };
 
@@ -124,8 +125,7 @@ extern int line_range__init(struct line_range *lr);
 extern const char *kernel_get_module_path(const char *module);
 
 extern int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
-                                 int max_probe_points, const char *module,
-                                 bool force_add);
+                                 int max_probe_points, bool force_add);
 extern int del_perf_probe_events(struct strlist *dellist);
 extern int show_perf_probe_events(void);
 extern int show_line_range(struct line_range *lr, const char *module,