[PATCH 19/61] selftests-dyndbg: add tools/testing/selftests/dynamic_debug/*
Jim Cromie
jim.cromie at gmail.com
Wed Oct 16 18:13:02 UTC 2024
Add a selftest script for dynamic-debug. The config requires
CONFIG_TEST_DYNAMIC_DEBUG=m (and CONFIG_TEST_DYNAMIC_DEBUG_SUBMOD=m),
which tacitly requires either CONFIG_DYNAMIC_DEBUG=y or
CONFIG_DYNAMIC_DEBUG_CORE=y
ATM this has just basic_tests(), which modifies pr_debug flags in
module params, which must be a builtin to handle boot args/options.
This is backported from another feature branch; the support-fns (thx
Lukas) have unused features at the moment, they'll get used shortly.
The script enables simple virtme-ng testing:
$> vng V=1 -- ./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
virtme: waiting for virtiofsd to start
virtme: use 'microvm' QEMU architecture
...
[ 4.136168] virtme-init: Setting hostname to v6.8-32-g30d431000676...
[ 4.240874] virtme-init: starting script
...
[ 4.474435] virtme-init: script returned {0}
Powering off.
[ 4.529318] ACPI: PM: Preparing to enter system sleep state S5
[ 4.529991] kvm: exiting hardware virtualization
[ 4.530428] reboot: Power down
And add dynamic_debug to TARGETS, so `make run_tests` sees it properly
for the impatient, set TARGETS explicitly:
bash-5.2# make TARGETS=dynamic_debug run_tests
make[1]: ...
TAP version 13
1..1
[ 35.552922] dyndbg: read 3 bytes from userspace
[ 35.553099] dyndbg: query 0: "=_" mod:*
[ 35.553544] dyndbg: processed 1 queries, with 1778 matches, 0 errs
...
Signed-off-by: Jim Cromie <jim.cromie at gmail.com>
Co-developed-by: Łukasz Bartosik <ukaszb at chromium.org>
Signed-off-by: Łukasz Bartosik <ukaszb at chromium.org>
---
- check KCONFIG_CONFIG to avoid silly fails
Several tests are dependent upon config choices. Lets avoid failing
where that is noise.
The KCONFIG_CONFIG var exists to convey the config-file around. If
the var names a file, read it and extract the relevant CONFIG items,
and use them to skip the dependent tests, thus avoiding the fails that
would follow, and the disruption to whatever CI is running these
selftests.
If the envar doesn't name a config-file, ".config" is assumed.
CONFIG_DYNAMIC_DEBUG=y:
basic-tests() and comma-terminator-tests() test for the presence of
the builtin pr_debugs in module/main.c, which I deemed stable and
therefore safe to count. That said, the test fails if only
CONFIG_DYNAMIC_DEBUG_CORE=y is set. It could be rewritten to test
against test-dynamic-debug.ko, but that just trades one config
dependence for another.
CONFIG_TEST_DYNAMIC_DEBUG=m
As written, test_percent_splitting() modprobes test_dynamic_debug,
enables several classes, and count them. It could be re-written to
work for the builtin module also, but builtin test modules are not a
common or desirable build/config.
CONFIG_TEST_DYNAMIC_DEBUG=m && CONFIG_TEST_DYNAMIC_DEBUG_SUBMOD=m
test_mod_submod() recaps the bug found in DRM-CI where drivers werent
enabled by drm.debug=<bits>. It modprobes both test_dynamic_debug &
test_dynamic_debug_submod, so it depends on a loadable modules config.
It could be rewritten to work in a builtin parent config; DRM=y is
common enough to be pertinent, but testing that config also wouldn't
really test anything more fully than all-loadable modules, since they
default together.
---
MAINTAINERS | 1 +
tools/testing/selftests/Makefile | 1 +
.../testing/selftests/dynamic_debug/Makefile | 9 +
tools/testing/selftests/dynamic_debug/config | 2 +
.../dynamic_debug/dyndbg_selftest.sh | 256 ++++++++++++++++++
5 files changed, 269 insertions(+)
create mode 100644 tools/testing/selftests/dynamic_debug/Makefile
create mode 100644 tools/testing/selftests/dynamic_debug/config
create mode 100755 tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
diff --git a/MAINTAINERS b/MAINTAINERS
index 202da01615e8..db65ab50dc43 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7859,6 +7859,7 @@ S: Maintained
F: include/linux/dynamic_debug.h
F: lib/dynamic_debug.c
F: lib/test_dynamic_debug*.c
+F: tools/testing/selftest/dynamic_debug/*
DYNAMIC INTERRUPT MODERATION
M: Tal Gilboa <talgi at nvidia.com>
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index bc8fe9e8f7f2..3a1ae4d9b189 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -24,6 +24,7 @@ TARGETS += drivers/net/team
TARGETS += drivers/net/virtio_net
TARGETS += drivers/platform/x86/intel/ifs
TARGETS += dt
+TARGETS += dynamic_debug
TARGETS += efivarfs
TARGETS += exec
TARGETS += fchmodat2
diff --git a/tools/testing/selftests/dynamic_debug/Makefile b/tools/testing/selftests/dynamic_debug/Makefile
new file mode 100644
index 000000000000..6d06fa7f1040
--- /dev/null
+++ b/tools/testing/selftests/dynamic_debug/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# borrowed from Makefile for user memory selftests
+
+# No binaries, but make sure arg-less "make" doesn't trigger "run_tests"
+all:
+
+TEST_PROGS := dyndbg_selftest.sh
+
+include ../lib.mk
diff --git a/tools/testing/selftests/dynamic_debug/config b/tools/testing/selftests/dynamic_debug/config
new file mode 100644
index 000000000000..d080da571ac0
--- /dev/null
+++ b/tools/testing/selftests/dynamic_debug/config
@@ -0,0 +1,2 @@
+CONFIG_TEST_DYNAMIC_DEBUG=m
+CONFIG_TEST_DYNAMIC_DEBUG_SUBMOD=m
diff --git a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
new file mode 100755
index 000000000000..68a9046405f2
--- /dev/null
+++ b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
@@ -0,0 +1,256 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0-only
+
+V=${V:=0} # invoke as V=1 $0 for global verbose
+RED="\033[0;31m"
+GREEN="\033[0;32m"
+YELLOW="\033[0;33m"
+BLUE="\033[0;34m"
+MAGENTA="\033[0;35m"
+CYAN="\033[0;36m"
+NC="\033[0;0m"
+error_msg=""
+
+[ -e /proc/dynamic_debug/control ] || {
+ echo -e "${RED}: this test requires CONFIG_DYNAMIC_DEBUG=y ${NC}"
+ exit 0 # nothing to test here, no good reason to fail.
+}
+
+# need info to avoid failures due to untestable configs
+
+[ -f "$KCONFIG_CONFIG" ] || KCONFIG_CONFIG=".config"
+if [ -f "$KCONFIG_CONFIG" ]; then
+ echo "# consulting KCONFIG_CONFIG: $KCONFIG_CONFIG"
+ grep -q "CONFIG_DYNAMIC_DEBUG=y" $KCONFIG_CONFIG ; LACK_DD_BUILTIN=$?
+ grep -q "CONFIG_TEST_DYNAMIC_DEBUG=m" $KCONFIG_CONFIG ; LACK_TMOD=$?
+ grep -q "CONFIG_TEST_DYNAMIC_DEBUG_SUBMOD=m" $KCONFIG_CONFIG ; LACK_TMOD_SUBMOD=$?
+ if [ $V -eq 1 ]; then
+ echo LACK_DD_BUILTIN: $LACK_DD_BUILTIN
+ echo LACK_TMOD: $LACK_TMOD
+ echo LACK_TMOD_SUBMOD: $LACK_TMOD_SUBMOD
+ fi
+else
+ LACK_DD_BUILTIN=0
+ LACK_TMOD=0
+ LACK_TMOD_SUBMOD=0
+fi
+
+function vx () {
+ echo $1 > /sys/module/dynamic_debug/parameters/verbose
+}
+
+function ddgrep () {
+ grep $1 /proc/dynamic_debug/control
+}
+
+function doprints () {
+ cat /sys/module/test_dynamic_debug/parameters/do_prints
+}
+
+function ddcmd () {
+ exp_exit_code=0
+ num_args=$#
+ if [ "${@:$#}" = "pass" ]; then
+ num_args=$#-1
+ elif [ "${@:$#}" = "fail" ]; then
+ num_args=$#-1
+ exp_exit_code=1
+ fi
+ args=${@:1:$num_args}
+ output=$((echo "$args" > /proc/dynamic_debug/control) 2>&1)
+ exit_code=$?
+ error_msg=$(echo $output | cut -d ":" -f 5 | sed -e 's/^[[:space:]]*//')
+ handle_exit_code $BASH_LINENO $FUNCNAME $exit_code $exp_exit_code
+}
+
+function handle_exit_code() {
+ local exp_exit_code=0
+ [ $# == 4 ] && exp_exit_code=$4
+ if [ $3 -ne $exp_exit_code ]; then
+ echo -e "${RED}: $BASH_SOURCE:$1 $2() expected to exit with code $exp_exit_code"
+ [ $3 == 1 ] && echo "Error: '$error_msg'"
+ exit
+ fi
+}
+
+# $1 - pattern to match, pattern in $1 is enclosed by spaces for a match ""\s$1\s"
+# $2 - number of times the pattern passed in $1 is expected to match
+# $3 - optional can be set either to "-r" or "-v"
+# "-r" means relaxed matching in this case pattern provided in $1 is passed
+# as is without enclosing it with spaces
+# "-v" prints matching lines
+# $4 - optional when $3 is set to "-r" then $4 can be used to pass "-v"
+function check_match_ct {
+ pattern="\s$1\s"
+ exp_cnt=0
+
+ [ "$3" == "-r" ] && pattern="$1"
+ let cnt=$(ddgrep "$pattern" | wc -l)
+ if [ $V -eq 1 ] || [ "$3" == "-v" ] || [ "$4" == "-v" ]; then
+ echo -ne "${BLUE}" && ddgrep $pattern && echo -ne "${NC}"
+ fi
+ [ $# -gt 1 ] && exp_cnt=$2
+ if [ $cnt -ne $exp_cnt ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO check failed expected $exp_cnt on $1, got $cnt"
+ exit
+ else
+ echo ": $cnt matches on $1"
+ fi
+}
+
+# $1 - trace instance name
+# #2 - if > 0 then directory is expected to exist, if <= 0 then otherwise
+# $3 - "-v" for verbose
+function check_trace_instance_dir {
+ if [ -e /sys/kernel/tracing/instances/$1 ]; then
+ if [ "$3" == "-v" ] ; then
+ echo "ls -l /sys/kernel/tracing/instances/$1: "
+ ls -l /sys/kernel/tracing/instances/$1
+ fi
+ if [ $2 -le 0 ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO error trace instance \
+ '/sys/kernel/tracing/instances/$1' does exist"
+ exit
+ fi
+ else
+ if [ $2 -gt 0 ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO error trace instance \
+ '/sys/kernel/tracing/instances/$1' does not exist"
+ exit
+ fi
+ fi
+}
+
+function tmark {
+ echo $* > /sys/kernel/tracing/trace_marker
+}
+
+# $1 - trace instance name
+# $2 - line number
+# $3 - if > 0 then the instance is expected to be opened, otherwise
+# the instance is expected to be closed
+function check_trace_instance {
+ output=$(tail -n9 /proc/dynamic_debug/control | grep ": Opened trace instances" \
+ | xargs -n1 | grep $1)
+ if [ "$output" != $1 ] && [ $3 -gt 0 ]; then
+ echo -e "${RED}: $BASH_SOURCE:$2 trace instance $1 is not opened"
+ exit
+ fi
+ if [ "$output" == $1 ] && [ $3 -le 0 ]; then
+ echo -e "${RED}: $BASH_SOURCE:$2 trace instance $1 is not closed"
+ exit
+ fi
+}
+
+function is_trace_instance_opened {
+ check_trace_instance $1 $BASH_LINENO 1
+}
+
+function is_trace_instance_closed {
+ check_trace_instance $1 $BASH_LINENO 0
+}
+
+# $1 - trace instance directory to delete
+# $2 - if > 0 then directory is expected to be deleted successfully, if <= 0 then otherwise
+function del_trace_instance_dir() {
+ exp_exit_code=1
+ [ $2 -gt 0 ] && exp_exit_code=0
+ output=$((rmdir /sys/kernel/debug/tracing/instances/$1) 2>&1)
+ exit_code=$?
+ error_msg=$(echo $output | cut -d ":" -f 3 | sed -e 's/^[[:space:]]*//')
+ handle_exit_code $BASH_LINENO $FUNCNAME $exit_code $exp_exit_code
+}
+
+function error_log_ref {
+ # to show what I got
+ : echo "# error-log-ref: $1"
+ : echo cat \$2
+}
+
+function ifrmmod {
+ lsmod | grep $1 2>&1>/dev/null && rmmod $1
+}
+
+# $1 - text to search for
+function search_trace() {
+ search_trace_name 0 1 $1
+}
+
+# $1 - trace instance name, 0 for global event trace
+# $2 - line number counting from the bottom
+# $3 - text to search for
+function search_trace_name() {
+ if [ "$1" = "0" ]; then
+ buf=$(cat /sys/kernel/debug/tracing/trace)
+ line=$(tail -$2 /sys/kernel/debug/tracing/trace | head -1 | sed -e 's/^[[:space:]]*//')
+ else
+ buf=$(cat /sys/kernel/debug/tracing/instances/$1/trace)
+ line=$(tail -$2 /sys/kernel/debug/tracing/instances/$1/trace | head -1 | \
+ sed -e 's/^[[:space:]]*//')
+ fi
+ if [ $2 = 0 ]; then
+ # whole-buf check
+ output=$(echo $buf | grep "$3")
+ else
+ output=$(echo $line | grep "$3")
+ fi
+ if [ "$output" = "" ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO search for '$3' failed \
+ in line '$line' or '$buf'"
+ exit
+ fi
+ if [ $V = 1 ]; then
+ echo -e "${MAGENTA}: search_trace_name in $1 found: \n$output \nin:${BLUE} $buf ${NC}"
+ fi
+}
+
+# $1 - error message to check
+function check_err_msg() {
+ if [ "$error_msg" != "$1" ]; then
+ echo -e "${RED}: $BASH_SOURCE:$BASH_LINENO error message '$error_msg' \
+ does not match with '$1'"
+ exit
+ fi
+}
+
+function basic_tests {
+ echo -e "${GREEN}# BASIC_TESTS ${NC}"
+ if [ $LACK_DD_BUILTIN -eq 1 ]; then
+ echo "SKIP"
+ return
+ fi
+ ddcmd =_ # zero everything
+ check_match_ct =p 0
+
+ # module params are builtin to handle boot args
+ check_match_ct '\[params\]' 4 -r
+ ddcmd module params +mpf
+ check_match_ct =pmf 4
+
+ # multi-cmd input, newline separated, with embedded comments
+ cat <<"EOF" > /proc/dynamic_debug/control
+ module params =_ # clear params
+ module params +mf # set flags
+ module params func parse_args +sl # other flags
+EOF
+ check_match_ct =mf 3
+ check_match_ct =mfsl 1
+ ddcmd =_
+}
+
+tests_list=(
+ basic_tests
+)
+
+# Run tests
+
+ifrmmod test_dynamic_debug_submod
+ifrmmod test_dynamic_debug
+
+for test in "${tests_list[@]}"
+do
+ $test
+ echo ""
+done
+echo -en "${GREEN}# Done on: "
+date
--
2.47.0
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