perf trace: Fix segfault on perf trace -i perf.data

When replaying a previous record session, it'll get a segfault since it
doesn't initialize raw_syscalls enter/exit tracepoint's evsel->priv for
caching the format fields.

So fix it by properly initializing sys_enter/exit evsels that comes from
reading the perf.data file header.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1384237500-22991-2-git-send-email-namhyung@kernel.org
[ Split the syscall tp field caching part in the previous patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 21 insertions, 16 deletions

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 3fa1dce6d43e..8d6ea8fbf476 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1766,16 +1766,6 @@ static int trace__process_sample(struct perf_tool *tool,
         return err;
 }
 
-static bool
-perf_session__has_tp(struct perf_session *session, const char *name)
-{
-        struct perf_evsel *evsel;
-
-        evsel = perf_evlist__find_tracepoint_by_name(session->evlist, name);
-
-        return evsel != NULL;
-}
-
 static int parse_target_str(struct trace *trace)
 {
         if (trace->opts.target.pid) {
@@ -2012,8 +2002,6 @@ out_error:
 static int trace__replay(struct trace *trace)
 {
         const struct perf_evsel_str_handler handlers[] = {
-                { "raw_syscalls:sys_enter",  trace__sys_enter, },
-                { "raw_syscalls:sys_exit",   trace__sys_exit, },
                 { "probe:vfs_getname",       trace__vfs_getname, },
         };
         struct perf_data_file file = {
@@ -2021,6 +2009,7 @@ static int trace__replay(struct trace *trace)
                 .mode  = PERF_DATA_MODE_READ,
         };
         struct perf_session *session;
+        struct perf_evsel *evsel;
         int err = -1;
 
         trace->tool.sample        = trace__process_sample;
@@ -2052,13 +2041,29 @@ static int trace__replay(struct trace *trace)
         if (err)
                 goto out;
 
-        if (!perf_session__has_tp(session, "raw_syscalls:sys_enter")) {
-                pr_err("Data file does not have raw_syscalls:sys_enter events\n");
+        evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
+                                                     "raw_syscalls:sys_enter");
+        if (evsel == NULL) {
+                pr_err("Data file does not have raw_syscalls:sys_enter event\n");
+                goto out;
+        }
+
+        if (perf_evsel__init_syscall_tp(evsel, trace__sys_enter) < 0 ||
+            perf_evsel__init_sc_tp_ptr_field(evsel, args)) {
+                pr_err("Error during initialize raw_syscalls:sys_enter event\n");
+                goto out;
+        }
+
+        evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
+                                                     "raw_syscalls:sys_exit");
+        if (evsel == NULL) {
+                pr_err("Data file does not have raw_syscalls:sys_exit event\n");
                 goto out;
         }
 
-        if (!perf_session__has_tp(session, "raw_syscalls:sys_exit")) {
-                pr_err("Data file does not have raw_syscalls:sys_exit events\n");
+        if (perf_evsel__init_syscall_tp(evsel, trace__sys_exit) < 0 ||
+            perf_evsel__init_sc_tp_uint_field(evsel, ret)) {
+                pr_err("Error during initialize raw_syscalls:sys_exit event\n");
                 goto out;
         }