selftests/ftrace: Add BTF fields access testcases

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>
This commit is contained in:
Masami Hiramatsu (Google) 2023-08-23 01:26:52 +09:00
parent 08c9306fc2
commit d892d3d3d8
2 changed files with 28 additions and 0 deletions

View 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

View 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