perf tools: Introduce perf_target__validate() helper

The perf_target__validate function is used to check given PID/TID/UID/CPU
target options and warn if some combination is impossible. Also this can
make some arguments of parse_target_uid() function useless as it is checked
before the call via our new helper.

Signed-off-by: Namhyung Kim <namhyung.kim@lge.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1335417327-11796-5-git-send-email-namhyung.kim@lge.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

5 files changed, 31 insertions, 29 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 4dcf27057bd2..3596ccab6d3b 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -884,16 +884,13 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
                 goto out_symbol_exit;
         }
 
-        rec->opts.target.uid = parse_target_uid(rec->opts.target.uid_str,
-                                                rec->opts.target.tid,
-                                                rec->opts.target.pid);
+        perf_target__validate(&rec->opts.target);
+
+        rec->opts.target.uid = parse_target_uid(rec->opts.target.uid_str);
         if (rec->opts.target.uid_str != NULL &&
             rec->opts.target.uid == UINT_MAX - 1)
                 goto out_free_fd;
 
-        if (rec->opts.target.pid)
-                rec->opts.target.tid = rec->opts.target.pid;
-
         if (perf_evlist__create_maps(evsel_list, rec->opts.target.pid,
                                      rec->opts.target.tid, rec->opts.target.uid,
                                      rec->opts.target.cpu_list) < 0)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 1ca767d906ef..bb7723221c0d 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1203,8 +1203,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
         if (add_default_attributes())
                 goto out;
 
-        if (target.pid)
-                target.tid = target.pid;
+        perf_target__validate(&target);
 
         evsel_list->threads = thread_map__new_str(target.pid,
                                                   target.tid, UINT_MAX);
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 2c1c207627b4..4f47952eddbd 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1252,21 +1252,12 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
 
         setup_browser(false);
 
-        top.target.uid = parse_target_uid(top.target.uid_str, top.target.tid,
-                                          top.target.pid);
+        perf_target__validate(&top.target);
+
+        top.target.uid = parse_target_uid(top.target.uid_str);
         if (top.target.uid_str != NULL && top.target.uid == UINT_MAX - 1)
                 goto out_delete_evlist;
 
-        /* CPU and PID are mutually exclusive */
-        if (top.target.tid && top.target.cpu_list) {
-                printf("WARNING: PID switch overriding CPU\n");
-                sleep(1);
-                top.target.cpu_list = NULL;
-        }
-
-        if (top.target.pid)
-                top.target.tid = top.target.pid;
-
         if (perf_evlist__create_maps(top.evlist, top.target.pid,
                                      top.target.tid, top.target.uid,
                                      top.target.cpu_list) < 0)
diff --git a/tools/perf/util/usage.c b/tools/perf/util/usage.c
index 52bb07c6442a..0a1a885a5914 100644
--- a/tools/perf/util/usage.c
+++ b/tools/perf/util/usage.c
@@ -83,7 +83,7 @@ void warning(const char *warn, ...)
         va_end(params);
 }
 
-uid_t parse_target_uid(const char *str, const char *tid, const char *pid)
+uid_t parse_target_uid(const char *str)
 {
         struct passwd pwd, *result;
         char buf[1024];
@@ -91,13 +91,6 @@ uid_t parse_target_uid(const char *str, const char *tid, const char *pid)
         if (str == NULL)
                 return UINT_MAX;
 
-        /* UID and PID are mutually exclusive */
-        if (tid || pid) {
-                ui__warning("PID/TID switch overriding UID\n");
-                sleep(1);
-                return UINT_MAX;
-        }
-
         getpwnam_r(str, &pwd, buf, sizeof(buf), &result);
 
         if (result == NULL) {
@@ -120,3 +113,23 @@ uid_t parse_target_uid(const char *str, const char *tid, const char *pid)
 
         return result->pw_uid;
 }
+
+void perf_target__validate(struct perf_target *target)
+{
+        if (target->pid)
+                target->tid = target->pid;
+
+        /* CPU and PID are mutually exclusive */
+        if (target->tid && target->cpu_list) {
+                ui__warning("WARNING: PID switch overriding CPU\n");
+                sleep(1);
+                target->cpu_list = NULL;
+        }
+
+        /* UID and PID are mutually exclusive */
+        if (target->tid && target->uid_str) {
+                ui__warning("PID/TID switch overriding UID\n");
+                sleep(1);
+                target->uid_str = NULL;
+        }
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 0f99f394d8e0..3f05d6264dab 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -246,10 +246,12 @@ unsigned long convert_unit(unsigned long value, char *unit);
 int readn(int fd, void *buf, size_t size);
 
 struct perf_event_attr;
+struct perf_target;
 
 void event_attr_init(struct perf_event_attr *attr);
 
-uid_t parse_target_uid(const char *str, const char *tid, const char *pid);
+uid_t parse_target_uid(const char *str);
+void perf_target__validate(struct perf_target *target);
 
 #define _STR(x) #x
 #define STR(x) _STR(x)