[PATCH v9.1 09/11] selftests/ftrace: Add tracepoint probe test case

Masami Hiramatsu (Google)
2023-05-02T02:19:24Z

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