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selftests/ftrace: Add BTF fields access testcases

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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
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20
tools/testing/selftests/ftrace/test.d/dynevent/add_remove_btfarg.tc
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

8
tools/testing/selftests/ftrace/test.d/dynevent/fprobe_syntax_errors.tc
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