[PATCH v8 27/35] selftests-dyndbg: test dyndbg-to-tracefs
Jim Cromie
jim.cromie at gmail.com
Mon Apr 29 19:39:13 UTC 2024
Add a series of trace-tests: test_actual_trace() etc, to validate that
the dyndbg-to-tracefs feature (using +T flag) works as intended. The
1st test uses the global tracebuf, the rest use/excercise private
tracebufs.
These tests are currently optional, via "TRACE" arg1, because the
feature code is in-the-lab. But its an objective test, and pretty
user-interface oriented.
IOW this passes:
:#> ./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
but this fails:
:#> ./tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh TRACE
So its won't break selftests success.
This allows the patch to be committed now w/o inducing selftest
failures, and the tests enabled later, with the promised code.
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>
---
.../dynamic_debug/dyndbg_selftest.sh | 435 ++++++++++++++++++
1 file changed, 435 insertions(+)
diff --git a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
index 54acee58cb4e..65f31418870f 100755
--- a/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
+++ b/tools/testing/selftests/dynamic_debug/dyndbg_selftest.sh
@@ -308,6 +308,405 @@ function test_mod_submod {
check_match_ct =p 14 -v
}
+# tests below here are all actually using dyndbg->trace,
+# and verifying the writes
+
+function test_actual_trace {
+ echo -e "${GREEN}# TEST_ACTUAL_TRACE ${NC}"
+ ddcmd =_
+ echo > /sys/kernel/tracing/trace
+ echo 1 >/sys/kernel/tracing/tracing_on
+ echo 1 >/sys/kernel/tracing/events/dyndbg/enable
+ modprobe test_dynamic_debug dyndbg=class,D2_CORE,+T:0
+ search_trace "D2_CORE msg"
+ search_trace_name 0 1 "D2_CORE msg"
+ check_match_ct =T 1
+ tmark "trace-mark"
+ search_trace "trace-mark"
+ doprints
+ search_trace "D2_CORE msg"
+ ifrmmod test_dynamic_debug
+}
+
+function self_start {
+ echo \# open, modprobe +T:selftest
+ ddcmd open selftest
+ check_trace_instance_dir selftest 1
+ is_trace_instance_opened selftest
+ modprobe test_dynamic_debug dyndbg=+T:selftest.mf
+ check_match_ct =T:selftest.mf 5
+}
+
+function self_end_normal {
+ echo \# disable -T:selftest, rmmod, close
+ ddcmd module test_dynamic_debug -T:selftest # leave mf
+ check_match_ct =:selftest.mf 5 -v
+ ddcmd module test_dynamic_debug +:0
+ ddcmd close selftest
+ is_trace_instance_closed selftest
+ ifrmmod test_dynamic_debug
+}
+
+function self_end_disable_anon {
+ echo \# disable, close, rmmod
+ ddcmd module test_dynamic_debug -T
+ check_match_ct =:selftest.mf 5
+ ddcmd module test_dynamic_debug +:0
+ ddcmd close selftest
+ is_trace_instance_closed selftest
+ ifrmmod test_dynamic_debug
+}
+
+function self_end_disable_anon_mf {
+ echo \# disable, close, rmmod
+ ddcmd module test_dynamic_debug -Tf
+ check_match_ct =:selftest.m 5
+ ddcmd module test_dynamic_debug +:0
+ ddcmd close selftest
+ is_trace_instance_closed selftest
+ ifrmmod test_dynamic_debug
+}
+
+function self_end_nodisable {
+ echo \# SKIPPING: ddcmd module test_dynamic_debug -T:selftest
+ ddcmd close selftest fail # close fails because selftest is still being used
+ check_err_msg "Device or resource busy"
+ check_match_ct =T:selftest.mf 5
+ rmmod test_dynamic_debug
+ ddcmd close selftest # now selftest can be closed because rmmod removed
+ # all callsites which were using it
+ is_trace_instance_closed selftest
+}
+
+function self_end_delete_directory {
+ del_trace_instance_dir selftest 0
+ check_err_msg "Device or resource busy"
+ ddcmd module test_dynamic_debug -mT:selftest
+ check_match_ct =:selftest.f 5
+ del_trace_instance_dir selftest 0
+ check_err_msg "Device or resource busy"
+ ddcmd module test_dynamic_debug +:0
+ ddcmd close selftest
+ check_trace_instance_dir selftest 1
+ is_trace_instance_closed selftest
+ del_trace_instance_dir selftest 1
+ check_trace_instance_dir selftest 0
+}
+
+function test_early_close () {
+ ddcmd open kparm_stream
+ ddcmd module usbcore +T:kparm_stream.mf
+ check_match_ct =T:usb_stream.mf 161
+ echo ":not-running # ddcmd module usbcore -T:kparm_stream.mf"
+ ddcmd close kparm_stream
+}
+
+function self_test_ {
+ echo "# SELFTEST $1"
+ self_start
+ self_end_$1
+}
+
+function cycle_tests_normal {
+ echo -e "${GREEN}# CYCLE_TESTS_NORMAL ${NC}"
+ self_test_ normal # ok
+ self_test_ disable_anon # ok
+ self_test_ normal # ok
+ self_test_ disable_anon_mf # ok
+}
+
+function cycle_not_best_practices {
+ echo -e "${GREEN}# CYCLE_TESTS_PROBLEMS ${NC}"
+ self_test_ nodisable
+ self_test_ normal
+ self_test_ delete_directory
+}
+
+# proper life cycle - open, enable:named, disable:named, close
+function test_private_trace_simple_proper {
+ echo -e "${GREEN}# TEST_PRIVATE_TRACE_1 ${NC}"
+ # ddcmd close kparm_stream
+ ddcmd open kparm_stream
+ ddcmd module params +T:kparm_stream.mf
+ check_match_ct =T:kparm_stream.mf 4
+ ddcmd module params -T:kparm_stream.mf
+ check_match_ct =T:kparm_stream.mf 0
+ is_trace_instance_opened kparm_stream
+ ddcmd module params +:0
+ ddcmd close kparm_stream
+ is_trace_instance_closed kparm_stream
+ ddcmd =_
+ check_trace_instance_dir kparm_stream 1
+ is_trace_instance_closed kparm_stream
+ del_trace_instance_dir kparm_stream 1
+ check_trace_instance_dir kparm_stream 0
+}
+
+function test_private_trace_2 {
+ echo -e "${GREEN}# TEST_PRIVATE_TRACE_2 ${NC}"
+ ddcmd =_
+ echo > /sys/kernel/tracing/trace
+ echo 1 >/sys/kernel/tracing/tracing_on
+ echo 1 >/sys/kernel/tracing/events/dyndbg/enable
+ ddcmd open foo
+ is_trace_instance_opened foo
+ check_trace_instance_dir foo 1
+
+ modprobe test_dynamic_debug
+ ddcmd class,D2_CORE,+T:foo.l,%class,D2_KMS,+fT:foo.ml
+ check_match_ct =T:foo.l 1
+ check_match_ct =T:foo.mfl 1
+
+ # purpose ?
+ echo 1 >/sys/kernel/tracing/tracing_on
+ echo 1 >/sys/kernel/tracing/events/dyndbg/enable
+
+ tmark test_private_trace about to do_prints
+ search_trace "test_private_trace about to do_prints"
+ search_trace_name "0" 1 "test_private_trace about to do_prints"
+
+ doprints
+ ddcmd class,D2_CORE,-T:foo
+ ddcmd close foo fail
+ check_err_msg "Device or resource busy"
+ ddcmd class,D2_KMS,-T:foo
+ ddcmd close foo
+ check_trace_instance_dir foo 1
+ is_trace_instance_closed foo
+ ddcmd close bar fail
+ check_err_msg "No such file or directory"
+ ifrmmod test_dynamic_debug
+ search_trace_name foo 2 "D2_CORE msg"
+ search_trace_name foo 1 "D2_KMS msg"
+ del_trace_instance_dir foo 1
+ check_trace_instance_dir foo 0
+}
+
+function test_private_trace_3 {
+ echo -e "${GREEN}# TEST_PRIVATE_TRACE_3 ${NC}"
+ ddcmd =_
+ echo > /sys/kernel/tracing/trace
+ echo 1 >/sys/kernel/tracing/tracing_on
+ echo 1 >/sys/kernel/tracing/events/dyndbg/enable
+ ddcmd open foo \; open bar
+ is_trace_instance_opened foo
+ is_trace_instance_opened bar
+ modprobe test_dynamic_debug
+ ddcmd class,D2_CORE,+T:foo
+ ddcmd class,D2_KMS,+T:foo
+ ddcmd class D2_CORE +T:foo \; class D2_KMS +T:foo
+ ddcmd "class,D2_CORE,+T:foo;,class,D2_KMS,+T:foo"
+ ddcmd class,D2_CORE,+T:foo\;class,D2_KMS,+T:foo
+ check_match_ct =T 2 -v
+ check_match_ct =Tl 0
+ check_match_ct =Tmf 0
+ echo 1 >/sys/kernel/tracing/tracing_on
+ echo 1 >/sys/kernel/tracing/events/dyndbg/enable
+ tmark test_private_trace_2 about to do_prints
+ doprints
+ rmmod test_dynamic_debug
+ ddcmd "close bar;close foo"
+ is_trace_instance_closed bar
+ is_trace_instance_closed foo
+ search_trace_name foo 2 "D2_CORE msg"
+ search_trace_name foo 1 "D2_KMS msg"
+ del_trace_instance_dir foo 1
+ check_trace_instance_dir foo 0
+ search_trace "test_private_trace_2 about to do_prints"
+ del_trace_instance_dir bar 1
+ check_trace_instance_dir bar 0
+}
+
+function test_private_trace_4 {
+ echo -e "${GREEN}# TEST_PRIVATE_TRACE_4 ${NC}"
+ ddcmd =_
+ echo > /sys/kernel/tracing/trace
+ echo 1 >/sys/kernel/tracing/tracing_on
+ echo 1 >/sys/kernel/tracing/events/dyndbg/enable
+
+ ddcmd open foo
+ modprobe test_dynamic_debug dyndbg=class,D2_CORE,+T:foo%class,D2_KMS,+T:foo
+ check_match_ct =Tl 0
+ check_match_ct =Tmf 0
+ check_match_ct =T 2
+
+ # are these 2 doing anything ?
+ echo 1 >/sys/kernel/tracing/tracing_on
+ echo 1 >/sys/kernel/tracing/events/dyndbg/enable
+
+ tmark should be ready
+ search_trace_name "0" 0 "should be ready" # in global trace
+
+ doprints
+ search_trace_name foo 2 "D2_CORE msg" # in private buf
+ search_trace_name foo 1 "D2_KMS msg"
+
+ # premature delete
+ del_trace_instance_dir foo 0
+ check_trace_instance_dir foo 1 # doesn't delete
+ ifrmmod test_dynamic_debug
+
+ ddcmd "close foo"
+ is_trace_instance_closed foo
+ del_trace_instance_dir foo 1 # delete works now
+
+ check_trace_instance_dir foo 0
+ search_trace "should be ready"
+}
+
+# $1 - trace-buf-name (or "0")
+# $2 - reference-buffer
+function search_in_trace_for {
+ bufname=$1; shift;
+ ref=$2;
+ ref2=$(echo $ref | cut -c20-)
+ echo $ref2
+}
+
+function test_private_trace_mixed_class {
+ echo -e "${GREEN}# TEST_PRIVATE_TRACE_5 ${NC}"
+ ddcmd =_
+ ddcmd module,params,+T:unopened fail
+ check_err_msg "Invalid argument"
+ is_trace_instance_closed unopened
+ check_trace_instance_dir unopened 0
+
+ ddcmd open bupkus
+ is_trace_instance_opened bupkus
+ check_trace_instance_dir bupkus 1
+ modprobe test_dynamic_debug \
+ dyndbg=class,D2_CORE,+T:bupkus.mf%class,D2_KMS,+T:bupkus.mf%class,V3,+T:bupkus.mf
+
+ # test various name misses
+ ddcmd "module params =T:bupkus1" fail # miss on name
+ check_err_msg "Invalid argument"
+ ddcmd "module params =T:unopened" fail # unopened
+ check_err_msg "Invalid argument"
+
+ ddcmd "module params =mlfT:bupkus." # we allow dot at the end of flags
+ ddcmd "module params =T:bupkus."
+ ddcmd "module params =:bupkus."
+ ddcmd "module params =:0."
+
+ check_match_ct =T:bupkus.mf 3 # the 3 classes enabled above
+ # enable the 5 non-class'd pr_debug()s
+ ddcmd "module test_dynamic_debug =T:bupkus"
+ check_match_ct =T:bupkus 8 -r # 8=5+3
+
+ doprints
+ ddcmd close,bupkus fail
+ check_err_msg "Device or resource busy"
+ ddcmd "module * -T:0" # misses class'd ones
+ ddcmd close,bupkus fail
+
+ ddcmd class,D2_CORE,-T:0%class,D2_KMS,-T:0%class,V3,-T:0 # turn off class'd and set dest to 0
+ ddcmd close,bupkus
+ is_trace_instance_closed bupkus
+
+ # check results
+ eyeball_ref=<<EOD
+ modprobe-1173 [001] ..... 7.781008: 0: test_dynamic_debug:do_cats: test_dd: D2_CORE msg
+ modprobe-1173 [001] ..... 7.781010: 0: test_dynamic_debug:do_cats: test_dd: D2_KMS msg
+ modprobe-1173 [001] ..... 7.781010: 0: test_dynamic_debug:do_levels: test_dd: V3 msg
+ cat-1214 [001] ..... 7.905494: 0: test_dd: doing categories
+ cat-1214 [001] ..... 7.905495: 0: test_dynamic_debug:do_cats: test_dd: D2_CORE msg
+ cat-1214 [001] ..... 7.905496: 0: test_dynamic_debug:do_cats: test_dd: D2_KMS msg
+ cat-1214 [001] ..... 7.905497: 0: test_dd: doing levels
+ cat-1214 [001] ..... 7.905498: 0: test_dynamic_debug:do_levels: test_dd: V3 msg
+EOD
+
+ # validate the 3 enabled class'd sites, with mf prefix
+ search_trace_name bupkus 0 "test_dynamic_debug:do_cats: test_dd: D2_CORE msg"
+ search_trace_name bupkus 0 "test_dynamic_debug:do_cats: test_dd: D2_KMS msg"
+ search_trace_name bupkus 0 "test_dynamic_debug:do_levels: test_dd: V3 msg"
+
+ search_trace_name bupkus 0 "test_dd: doing levels"
+ search_trace_name bupkus 0 "test_dd: doing categories"
+
+ # reopen wo error
+ ddcmd open bupkus
+ is_trace_instance_opened bupkus
+ check_trace_instance_dir bupkus 1
+
+ ddcmd "module test_dynamic_debug =T:bupkus" # rearm the 5 plain-old prdbgs
+ check_match_ct =T:bupkus 5
+
+ doprints # 2nd time
+ search_trace_name bupkus 0 "test_dd: doing categories"
+ search_trace_name bupkus 0 "test_dd: doing levels""
+ search_trace_name bupkus 2 "test_dd: doing categories"
+ search_trace_name bupkus 1 "test_dd: doing levels""
+
+ ddcmd close,bupkus fail
+ check_err_msg "Device or resource busy"
+ del_trace_instance_dir bupkus 0
+ check_err_msg "Device or resource busy"
+ check_trace_instance_dir bupkus 1
+ is_trace_instance_opened bupkus
+ check_trace_instance_dir bupkus 1
+
+ # drop last users, now delete works
+ ddcmd "module * -T:0"
+ ddcmd close,bupkus
+ is_trace_instance_closed bupkus
+ del_trace_instance_dir bupkus 1
+ check_trace_instance_dir bupkus 0
+ ifrmmod test_dynamic_debug
+}
+
+function test_private_trace_overlong_name {
+ echo -e "${GREEN}# TEST_PRIVATE_TRACE_overlong_name ${NC}"
+ ddcmd =_
+ name="A_bit_lengthy_trace_instance_name"
+ ddcmd open $name
+ is_trace_instance_opened $name
+ check_trace_instance_dir $name 1
+
+ ddcmd "file kernel/module/main.c +T:$name.mf "
+ check_match_ct =T:A_bit_lengthy_trace_....mf 14
+
+ ddcmd "module * -T"
+ check_match_ct =:A_bit_lengthy_trace_....mf 14
+ check_match_ct kernel/module/main.c 14 -r # to be certain
+
+ ddcmd "module * -T:0"
+ ddcmd close,$name
+ is_trace_instance_closed $name
+ del_trace_instance_dir $name 1
+ check_trace_instance_dir $name 0
+}
+
+function test_private_trace_fill_trace_index {
+ echo -e "${GREEN}# TEST_PRIVATE_TRACE_fill_trace_index ${NC}"
+ ddcmd =_
+ name="trace_instance_"
+ for i in {1..63}
+ do
+ ddcmd open $name$i
+ is_trace_instance_opened $name$i
+ check_trace_instance_dir $name$i 1
+ done
+ # catch the 1-too-many err
+ ddcmd "open too_many" fail
+ check_err_msg "No space left on device"
+
+ ddcmd 'file kernel/module/main.c =T:trace_instance_63.m'
+ check_match_ct =T:trace_instance_63.m 14
+
+ for i in {1..62}
+ do
+ ddcmd close $name$i
+ is_trace_instance_closed $name$i
+ del_trace_instance_dir $name$i 1
+ check_trace_instance_dir $name$i 0
+ done
+ ddcmd "module * -T:0"
+ ddcmd close,trace_instance_63
+ is_trace_instance_closed trace_instance_63
+ del_trace_instance_dir trace_instance_63 1
+ check_trace_instance_dir trace_instance_63 0
+}
+
tests_list=(
basic_tests
# these require test_dynamic_debug*.ko
@@ -315,9 +714,28 @@ tests_list=(
test_percent_splitting
test_mod_submod
)
+trace_tests=(
+ # these tests write to tracebuf, and check its contents
+ test_actual_trace
+ cycle_tests_normal
+ cycle_not_best_practices
+ test_private_trace_1
+ test_private_trace_simple_proper
+ test_private_trace_2
+ test_private_trace_3
+ test_private_trace_4
+ test_private_trace_mixed_class
+ test_private_trace_mixed_class # again, to test pre,post conditions
+
+ test_private_trace_overlong_name
+
+ # works, takes 30 sec
+ test_private_trace_fill_trace_index
+)
# Run tests
+# rmmod modules to clear their possibly modified state
ifrmmod test_dynamic_debug_submod
ifrmmod test_dynamic_debug
@@ -326,5 +744,22 @@ do
$test
echo ""
done
+
+if [[ "$1" = "TRACE" ]] ; then
+
+ # rmmod modules to clear their possibly modified state
+ ifrmmod test_dynamic_debug_submod
+ ifrmmod test_dynamic_debug
+
+ for test in "${trace_tests[@]}"
+ do
+ $test
+ echo ""
+ done
+fi
+
+# leave modules in place at end
+# so that evidence of mishap is present
+
echo -en "${GREEN}# Done on: "
date
--
2.44.0
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