selftests/ftrace: Add BTF fields access testcases
authorMasami Hiramatsu (Google) <mhiramat@kernel.org>
Tue, 22 Aug 2023 16:26:52 +0000 (01:26 +0900)
committerMasami Hiramatsu (Google) <mhiramat@kernel.org>
Wed, 23 Aug 2023 00:41:55 +0000 (09:41 +0900)
Add test cases for accessing the data structure fields using BTF info.
This includes the field access from parameters and retval, and accessing
string information.

Link: https://lore.kernel.org/all/169272161265.160970.14048619786574971276.stgit@devnote2/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
tools/testing/selftests/ftrace/test.d/dynevent/add_remove_btfarg.tc
tools/testing/selftests/ftrace/test.d/dynevent/fprobe_syntax_errors.tc

index f34b14e..b9c21a8 100644 (file)
@@ -5,6 +5,7 @@
 
 KPROBES=
 FPROBES=
+FIELDS=
 
 if grep -qF "p[:[<group>/][<event>]] <place> [<args>]" README ; then
   KPROBES=yes
@@ -12,6 +13,9 @@ fi
 if grep -qF "f[:[<group>/][<event>]] <func-name>[%return] [<args>]" README ; then
   FPROBES=yes
 fi
+if grep -qF "<argname>[->field[->field|.field...]]" README ; then
+  FIELDS=yes
+fi
 
 if [ -z "$KPROBES" -a -z "$FPROBES" ] ; then
   exit_unsupported
@@ -21,6 +25,9 @@ echo 0 > events/enable
 echo > dynamic_events
 
 TP=kfree
+TP2=kmem_cache_alloc
+TP3=getname_flags
+TP4=sched_wakeup
 
 if [ "$FPROBES" ] ; then
 echo "f:fpevent $TP object" >> dynamic_events
@@ -33,6 +40,7 @@ echo > dynamic_events
 
 echo "f:fpevent $TP "'$arg1' >> dynamic_events
 grep -q "fpevent.*object=object" dynamic_events
+
 echo > dynamic_events
 
 echo "f:fpevent $TP "'$arg*' >> dynamic_events
@@ -45,6 +53,18 @@ fi
 
 echo > dynamic_events
 
+if [ "$FIELDS" ] ; then
+echo "t:tpevent ${TP2} obj_size=s->object_size" >> dynamic_events
+echo "f:fpevent ${TP3}%return path=\$retval->name:string" >> dynamic_events
+echo "t:tpevent2 ${TP4} p->se.group_node.next->prev" >> dynamic_events
+
+grep -q "tpevent .*obj_size=s->object_size" dynamic_events
+grep -q "fpevent.*path=\$retval->name:string" dynamic_events
+grep -q 'tpevent2 .*p->se.group_node.next->prev' dynamic_events
+
+echo > dynamic_events
+fi
+
 if [ "$KPROBES" ] ; then
 echo "p:kpevent $TP object" >> dynamic_events
 grep -q "kpevent.*object=object" dynamic_events
index 72563b2..20e42c0 100644 (file)
@@ -103,6 +103,14 @@ check_error 'f vfs_read%return ^$arg*'             # NOFENTRY_ARGS
 check_error 'f vfs_read ^hoge'                 # NO_BTFARG
 check_error 'f kfree ^$arg10'                  # NO_BTFARG (exceed the number of parameters)
 check_error 'f kfree%return ^$retval'          # NO_RETVAL
+
+if grep -qF "<argname>[->field[->field|.field...]]" README ; then
+check_error 'f vfs_read%return $retval->^foo'  # NO_PTR_STRCT
+check_error 'f vfs_read file->^foo'            # NO_BTF_FIELD
+check_error 'f vfs_read file^-.foo'            # BAD_HYPHEN
+check_error 'f vfs_read ^file:string'          # BAD_TYPE4STR
+fi
+
 else
 check_error 'f vfs_read ^$arg*'                        # NOSUP_BTFARG
 check_error 't kfree ^$arg*'                   # NOSUP_BTFARG