[LTP] [PATCH] [dynamic debug] - Check interface and functionality
vkabatov@redhat.com
vkabatov@redhat.com
Tue Aug 22 12:22:44 CEST 2017
From: Veronika Kabatova <vkabatov@redhat.com>
Add a new test to verify enabling and disabling traces with supported
flags works and doesn't cause any issues.
Dynamic debug was added in kernel 2.6.30, the first version only
supported "p" flag and used "-" as indicator for no flags set. In
kernel 3.2, additional flags "flmt" were added. Finally, in kernel
3.4, the indicator for no flags was changed to "=_".
The test takes into account different kernel versions and interface
changes listed above.
Signed-off-by: Veronika Kabatova <vkabatov@redhat.com>
---
runtest/tracing | 1 +
testcases/kernel/tracing/dynamic_debug/Makefile | 27 ++++
.../tracing/dynamic_debug/dynamic_debug01.sh | 174 +++++++++++++++++++++
3 files changed, 202 insertions(+)
create mode 100644 testcases/kernel/tracing/dynamic_debug/Makefile
create mode 100755 testcases/kernel/tracing/dynamic_debug/dynamic_debug01.sh
diff --git a/runtest/tracing b/runtest/tracing
index 9f8d5c86a..8285eeb43 100644
--- a/runtest/tracing
+++ b/runtest/tracing
@@ -2,3 +2,4 @@
ftrace_regression01 ftrace_regression01.sh
ftrace_regression02 ftrace_regression02.sh
ftrace-stress-test ftrace_stress_test.sh 90
+dynamic_debug01 dynamic_debug01.sh
diff --git a/testcases/kernel/tracing/dynamic_debug/Makefile b/testcases/kernel/tracing/dynamic_debug/Makefile
new file mode 100644
index 000000000..2a6e53a11
--- /dev/null
+++ b/testcases/kernel/tracing/dynamic_debug/Makefile
@@ -0,0 +1,27 @@
+#
+# tracing/dynamic_debug test suite Makefile.
+#
+# Copyright (C) 2017 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, see <http://www.gnu.org/licenses/>.
+#
+
+top_srcdir ?= ../../..
+
+include $(top_srcdir)/include/mk/env_pre.mk
+
+INSTALL_TARGETS := *.sh
+
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
+
diff --git a/testcases/kernel/tracing/dynamic_debug/dynamic_debug01.sh b/testcases/kernel/tracing/dynamic_debug/dynamic_debug01.sh
new file mode 100755
index 000000000..548063513
--- /dev/null
+++ b/testcases/kernel/tracing/dynamic_debug/dynamic_debug01.sh
@@ -0,0 +1,174 @@
+#!/bin/sh
+
+# Copyright (C) 2017 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and#or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, see <http://www.gnu.org/licenses/>.
+#
+#
+# Test description: Test functionality of dynamic debug feature by enabling
+# and disabling traces with available flags. Check that these
+# settings don't cause issues by searching dmesg.
+#
+# This test handles changes of dynamic debug interface from
+# commits 5ca7d2a6 (dynamic_debug: describe_flags with
+# '=[pmflt_]*') and 8ba6ebf5 (Dynamic debug: Add more flags)
+#
+# Usage
+# ./dynamic_debug01.sh
+
+TST_TESTFUNC=ddebug_test
+TST_NEEDS_CMDS="awk"
+TST_NEEDS_TMPDIR=1
+TST_NEEDS_ROOT=1
+TST_SETUP=setup
+TST_CLEANUP=cleanup
+
+. tst_test.sh
+
+
+DEBUGFS_WAS_MOUNTED=0
+DEBUGFS_PATH=""
+DEBUGFS_CONTROL=""
+DYNDEBUG_STATEMENTS="./debug_statements"
+EMPTY_FLAG=""
+NEW_INTERFACE=0
+
+
+mount_debugfs()
+{
+ if grep -q debugfs /proc/mounts ; then
+ DEBUGFS_WAS_MOUNTED=1
+ DEBUGFS_PATH=$(grep debugfs /proc/mounts | awk '{print $2}')
+ tst_res TINFO "debugfs already mounted at $DEBUGFS_PATH"
+ else
+ if ! grep -q debugfs /proc/filesystems ; then
+ tst_res TCONF "debugfs not supported"
+ fi
+ DEBUGFS_PATH="$(pwd)/tst_debug"
+ mkdir "$DEBUGFS_PATH"
+ if mount -t debugfs xxx "$DEBUGFS_PATH" ; then
+ tst_res TINFO "debugfs mounted at $DEBUGFS_PATH"
+ else
+ tst_res TFAIL "Unable to mount debugfs"
+ fi
+ fi
+}
+
+setup()
+{
+ if tst_kvcmp -lt 2.6.30 ; then
+ tst_brk TCONF "Dynamic debug is available since version 2.6.30"
+ fi
+
+ mount_debugfs
+ if [ ! -d "$DEBUGFS_PATH/dynamic_debug" ] ; then
+ tst_res TBROK "Unable to find $DEBUGFS_PATH/dynamic_debug"
+ fi
+ DEBUGFS_CONTROL="$DEBUGFS_PATH/dynamic_debug/control"
+ if [ ! -e "$DEBUGFS_CONTROL" ] ; then
+ tst_res TBROK "Unable to find $DEBUGFS_CONTROL"
+ fi
+
+ # Both patches with changes were backported to RHEL6 kernel 2.6.32-547
+ if tst_kvcmp -ge '3.4 RHEL6:2.6.32-547' ; then
+ NEW_INTERFACE=1
+ fi
+
+ EMPTY_FLAG=$([ $NEW_INTERFACE -eq 1 ] && echo "=_" || echo "-")
+ grep -v "^#" "$DEBUGFS_CONTROL" > "$DYNDEBUG_STATEMENTS"
+}
+
+do_flag()
+{
+ FLAG="$1"
+ OPTION_TO_SET="$2"
+ OPTION_VALUE="$3"
+
+ if ! echo "$OPTION_TO_SET $OPTION_VALUE $FLAG" > \
+ "$DEBUGFS_CONTROL" ; then
+ tst_res TFAIL "Setting '$OPTION_TO_SET $OPTION_VALUE " \
+ "$FLAG' failed with $?!"
+ fi
+}
+
+do_all_flags()
+{
+ OPTION="$1"
+ ALL_INPUTS="$2"
+
+ echo "$ALL_INPUTS" | while read -r INPUT_LINE ; do
+ do_flag "+p" "$OPTION" "$INPUT_LINE"
+ if tst_kvcmp -ge 3.2 || [ $NEW_INTERFACE -eq 1 ] ; then
+ do_flag "+flmt" "$OPTION" "$INPUT_LINE"
+ do_flag "-flmt" "$OPTION" "$INPUT_LINE"
+ fi
+ do_flag "-p" "$OPTION" "$INPUT_LINE"
+ done
+
+ if awk -v emp="$EMPTY_FLAG" '$3 != emp' "$DEBUGFS_CONTROL" \
+ | grep -v -q "^#" ; then
+ tst_res TFAIL "Failed to remove all set flags"
+ fi
+}
+
+ddebug_test()
+{
+ dmesg > ./dmesg.old
+
+ DD_FUNCS=$(awk -F " |]" '{print $3}' "$DYNDEBUG_STATEMENTS" \
+ | sort | uniq)
+ DD_FILES=$(awk -F " |:" '{print $1}' "$DYNDEBUG_STATEMENTS" \
+ | sort | uniq)
+ DD_LINES=$(awk -F " |:" '{print $2}' "$DYNDEBUG_STATEMENTS" \
+ | sort | uniq)
+ DD_MODULES=$(awk -F [][] '{print $2}' "$DYNDEBUG_STATEMENTS" \
+ | sort | uniq)
+
+ do_all_flags "func" "$DD_FUNCS"
+ do_all_flags "file" "$DD_FILES"
+ do_all_flags "line" "$DD_LINES"
+ do_all_flags "module" "$DD_MODULES"
+
+ dmesg > ./dmesg.new
+ sed -i -e 1,`wc -l < ./dmesg.old`d ./dmesg.new
+ if grep -q -e "Kernel panic" -e "Oops" -e "general protection fault" \
+ -e "general protection handler: wrong gs" -e "\(XEN\) Panic" \
+ -e "fault" -e "warn" -e "BUG" ./dmesg.new ; then
+ tst_res TFAIL "Issues found in dmesg!"
+ else
+ tst_res TPASS "Dynamic debug OK"
+ fi
+}
+
+cleanup()
+{
+ if [ $DEBUGFS_WAS_MOUNTED -eq 0 ] ; then
+ tst_umount "$DEBUGFS_PATH"
+ else
+ FLAGS_SET=$(awk -v emp="$EMPTY_FLAG" '$3 != emp' \
+ $DYNDEBUG_STATEMENTS)
+ if [ "$FLAGS_SET" ] ; then
+ FLAG_PREFIX=$([ $NEW_INTERFACE -eq 1 ] \
+ && echo "" || echo "+")
+ echo "$FLAGS_SET" | while read -r FLAG_LINE ; do
+ echo -n "$FLAG_LINE" \
+ | awk -v prf="$FLAG_PREFIX" -F " |:" \
+ '{print "file "$1" line "$2" "prf $4}' \
+ > "$DEBUGFS_CONTROL"
+ done
+ fi
+ fi
+}
+
+tst_run
--
2.13.3
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