Commit d892d3d3 authored by Masami Hiramatsu (Google)'s avatar Masami Hiramatsu (Google)
Browse files

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: default avatarMasami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: default avatarAlan Maguire <alan.maguire@oracle.com>
Acked-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 08c9306f

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

+20 −0
Original line number Diff line number Diff line
@@ -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

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

+8 −0
Original line number Diff line number Diff line
@@ -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