linux-kernel - [PATCH v9.1 10/11] selftests/ftrace: Add BTF arguments test cases

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Date:   Tue,  2 May 2023 11:18:47 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     linux-trace-kernel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        mhiramat@...nel.org, Florent Revest <revest@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Will Deacon <will@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Martin KaFai Lau <martin.lau@...ux.dev>, bpf@...r.kernel.org
Subject: [PATCH v9.1 10/11] selftests/ftrace: Add BTF arguments test cases

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Add test cases to check the BTF arguments correctly supported.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
Changes in v7:
 - Add BTF void retval test case
---
 .../ftrace/test.d/dynevent/add_remove_btfarg.tc    |   54 ++++++++++++++++++++
 .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc |   11 ++++
 .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc   |   11 ++++
 3 files changed, 76 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/add_remove_btfarg.tc

diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_btfarg.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_btfarg.tc
new file mode 100644
index 000000000000..15515f0a8c9a
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_btfarg.tc
@@ -0,0 +1,54 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Generic dynamic event - add/remove probes with BTF arguments
+# requires: dynamic_events "<argname>":README
+
+KPROBES=
+FPROBES=
+
+if grep -qF "p[:[<group>/][<event>]] <place> [<args>]" README ; then
+  KPROBES=yes
+fi
+if grep -qF "f[:[<group>/][<event>]] <func-name>[%return] [<args>]" README ; then
+  FPROBES=yes
+fi
+
+if [ -z "$KPROBES" -a "$FPROBES" ] ; then
+  exit_unsupported
+fi
+
+echo 0 > events/enable
+echo > dynamic_events
+
+TP=kfree
+
+if [ "$FPROBES" ] ; then
+echo "f:fpevent $TP object" >> dynamic_events
+echo "t:tpevent $TP ptr" >> dynamic_events
+
+grep -q "fpevent.*object=object" dynamic_events
+grep -q "tpevent.*ptr=ptr" dynamic_events
+
+echo > dynamic_events
+
+echo "f:fpevent $TP "'$$args' >> dynamic_events
+echo "t:tpevent $TP "'$$args' >> dynamic_events
+
+grep -q "fpevent.*object=object" dynamic_events
+grep -q "tpevent.*ptr=ptr" dynamic_events
+! grep -q "tpevent.*_data" dynamic_events
+fi
+
+echo > dynamic_events
+
+if [ "$KPROBES" ] ; then
+echo "p:kpevent $TP object" >> dynamic_events
+grep -q "kpevent.*object=object" dynamic_events
+
+echo > dynamic_events
+
+echo "p:kpevent $TP "'$$args' >> dynamic_events
+grep -q "kpevent.*object=object" dynamic_events
+fi
+
+clear_trace
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/fprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/dynevent/fprobe_syntax_errors.tc
index 549daa162d84..f2d000bf6371 100644
--- a/tools/testing/selftests/ftrace/test.d/dynevent/fprobe_syntax_errors.tc
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/fprobe_syntax_errors.tc
@@ -85,4 +85,15 @@ fi
 # %return suffix errors
 check_error 'f vfs_read^%hoge'		# BAD_ADDR_SUFFIX
 
+# BTF arguments errors
+if grep -q "<argname>" README; then
+check_error 'f vfs_read $$args ^$$args'		# DOUBLE_ARGS
+check_error 'f vfs_read%return ^$$args'		# NOFENTRY_ARGS
+check_error 'f vfs_read ^hoge'			# NO_BTFARG
+check_error 'f kfree%return ^$retval'		# NO_RETVAL
+else
+check_error 'f vfs_read $$args'			# NOSUP_BTFARG
+check_error 't kfree $$args'			# NOSUP_BTFARG
+fi
+
 exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
index 97c08867490a..d9add5d408f0 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
@@ -103,4 +103,15 @@ check_error 'p vfs_read^%hoge'		# BAD_ADDR_SUFFIX
 check_error 'p ^vfs_read+10%return'	# BAD_RETPROBE
 fi
 
+# BTF arguments errors
+if grep -q "<argname>" README; then
+check_error 'p vfs_read $$args ^$$args'		# DOUBLE_ARGS
+check_error 'r vfs_read ^$$args'		# NOFENTRY_ARGS
+check_error 'p vfs_read+8 ^$$args'		# NOFENTRY_ARGS
+check_error 'p vfs_read ^hoge'			# NO_BTFARG
+check_error 'r vfs_read ^$retval'		# NO_RETVAL
+else
+check_error 'p vfs_read $$args'			# NOSUP_BTFARG
+fi
+
 exit 0