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From:   "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
To:     linux-trace-kernel@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>,
        mhiramat@kernel.org, Florent Revest <revest@chromium.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Will Deacon <will@kernel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Martin KaFai Lau <martin.lau@linux.dev>, bpf@vger.kernel.org
Subject: [PATCH v6 08/10] selftests/ftrace: Add tracepoint probe test case
Date:   Mon, 24 Apr 2023 23:47:15 +0900
Message-ID:  <168234763568.2210510.3938745249036448130.stgit@mhiramat.roam.corp.google.com>
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References:  <168234755610.2210510.12133559313738141202.stgit@mhiramat.roam.corp.google.com>
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From: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Add test cases for tracepoint probe events.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
---
 .../ftrace/test.d/dynevent/add_remove_tprobe.tc    |   27 +++++++
 .../ftrace/test.d/dynevent/tprobe_syntax_errors.tc |   82 ++++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe.tc
 create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/tprobe_syntax_errors.tc

diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe.tc
new file mode 100644
index 000000000000..afc8412fde6b
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_tprobe.tc
@@ -0,0 +1,27 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Generic dynamic event - add/remove tracepoint probe events
+# requires: dynamic_events "t[:[<group>/][<event>]] <tracepoint> [<args>]": README
+
+echo 0 > events/enable
+echo > dynamic_events
+
+TRACEPOINT1=kmem_cache_alloc
+TRACEPOINT2=kmem_cache_free
+
+echo "t:myevent1 $TRACEPOINT1" >> dynamic_events
+echo "t:myevent2 $TRACEPOINT2" >> dynamic_events
+
+grep -q myevent1 dynamic_events
+grep -q myevent2 dynamic_events
+test -d events/tracepoints/myevent1
+test -d events/tracepoints/myevent2
+
+echo "-:myevent2" >> dynamic_events
+
+grep -q myevent1 dynamic_events
+! grep -q myevent2 dynamic_events
+
+echo > dynamic_events
+
+clear_trace
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/tprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/dynevent/tprobe_syntax_errors.tc
new file mode 100644
index 000000000000..c8dac5c1cfa8
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/tprobe_syntax_errors.tc
@@ -0,0 +1,82 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Tracepoint probe event parser error log check
+# requires: dynamic_events "t[:[<group>/][<event>]] <tracepoint> [<args>]": README
+
+check_error() { # command-with-error-pos-by-^
+    ftrace_errlog_check 'trace_fprobe' "$1" 'dynamic_events'
+}
+
+check_error 't^100 kfree'		# BAD_MAXACT_TYPE
+
+check_error 't ^non_exist_tracepoint'	# NO_TRACEPOINT
+check_error 't:^/bar kfree'		# NO_GROUP_NAME
+check_error 't:^12345678901234567890123456789012345678901234567890123456789012345/bar kfree'	# GROUP_TOO_LONG
+
+check_error 't:^foo.1/bar kfree'	# BAD_GROUP_NAME
+check_error 't:^ kfree'			# NO_EVENT_NAME
+check_error 't:foo/^12345678901234567890123456789012345678901234567890123456789012345 kfree'	# EVENT_TOO_LONG
+check_error 't:foo/^bar.1 kfree'	# BAD_EVENT_NAME
+
+check_error 't kfree ^$retval'		# RETVAL_ON_PROBE
+check_error 't kfree ^$stack10000'	# BAD_STACK_NUM
+
+check_error 't kfree ^$arg10000'	# BAD_ARG_NUM
+
+check_error 't kfree ^$none_var'	# BAD_VAR
+check_error 't kfree ^%rax'		# BAD_VAR
+
+check_error 't kfree ^@12345678abcde'	# BAD_MEM_ADDR
+check_error 't kfree ^@+10'		# FILE_ON_KPROBE
+
+grep -q "imm-value" README && \
+check_error 't kfree arg1=\^x'	# BAD_IMM
+grep -q "imm-string" README && \
+check_error 't kfree arg1=\"abcd^'	# IMMSTR_NO_CLOSE
+
+check_error 't kfree ^+0@0)'		# DEREF_NEED_BRACE
+check_error 't kfree ^+0ab1(@0)'	# BAD_DEREF_OFFS
+check_error 't kfree +0(+0(@0^)'	# DEREF_OPEN_BRACE
+
+if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
+check_error 't kfree +0(^$comm)'	# COMM_CANT_DEREF
+fi
+
+check_error 't kfree ^&1'		# BAD_FETCH_ARG
+
+
+# We've introduced this limitation with array support
+if grep -q ' <type>\\\[<array-size>\\\]' README; then
+check_error 't kfree +0(^+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(@0))))))))))))))'	# TOO_MANY_OPS?
+check_error 't kfree +0(@11):u8[10^'		# ARRAY_NO_CLOSE
+check_error 't kfree +0(@11):u8[10]^a'		# BAD_ARRAY_SUFFIX
+check_error 't kfree +0(@11):u8[^10a]'		# BAD_ARRAY_NUM
+check_error 't kfree +0(@11):u8[^256]'		# ARRAY_TOO_BIG
+fi
+
+check_error 't kfree @11:^unknown_type'		# BAD_TYPE
+check_error 't kfree $stack0:^string'		# BAD_STRING
+check_error 't kfree @11:^b10@a/16'		# BAD_BITFIELD
+
+check_error 't kfree ^arg123456789012345678901234567890=@11'	# ARG_NAME_TOO_LOG
+check_error 't kfree ^=@11'			# NO_ARG_NAME
+check_error 't kfree ^var.1=@11'		# BAD_ARG_NAME
+check_error 't kfree var1=@11 ^var1=@12'	# USED_ARG_NAME
+check_error 't kfree ^+1234567(+1234567(+1234567(+1234567(+1234567(+1234567(@1234))))))'	# ARG_TOO_LONG
+check_error 't kfree arg1=^'			# NO_ARG_BODY
+
+
+# multiprobe errors
+if grep -q "Create/append/" README && grep -q "imm-value" README; then
+echo "t:tracepoint/testevent kfree" > dynamic_events
+check_error '^f:tracepoint/testevent kfree'	# DIFF_PROBE_TYPE
+
+# Explicitly use printf "%s" to not interpret \1
+printf "%s" "t:tracepoints/testevent kfree abcd=\\1" > dynamic_events
+check_error "t:tracepoints/testevent kfree ^bcd=\\1"	# DIFF_ARG_TYPE
+check_error "t:tracepoints/testevent kfree ^abcd=\\1:u8"	# DIFF_ARG_TYPE
+check_error "t:tracepoints/testevent kfree ^abcd=\\\"foo\"" # DIFF_ARG_TYPE
+check_error "^t:tracepoints/testevent kfree abcd=\\1"	# SAME_PROBE
+fi
+
+exit 0