github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-30 10:04:04 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

selftests: livepatch: add new ftrace helpers functions

Browse Source 
Add new ftrace helpers functions cleanup_tracing, trace_function and
check_traced_functions.

Signed-off-by: Filipe Xavier <felipeaggger@gmail.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20250324-ftrace-sftest-livepatch-v3-1-d9d7cc386c75@gmail.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Filipe Xavier 2025-03-24 19:50:18 -03:00 committed by Petr Mladek
parent 336088234e
commit 2ca7cd8020
1 changed files with 49 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
tools/testing/selftests/livepatch/functions.sh
View File

@ -10,6 +10,7 @@ SYSFS_KERNEL_DIR="/sys/kernel"
SYSFS_KLP_DIR="$SYSFS_KERNEL_DIR/livepatch"
SYSFS_DEBUG_DIR="$SYSFS_KERNEL_DIR/debug"
SYSFS_KPROBES_DIR="$SYSFS_DEBUG_DIR/kprobes"
SYSFS_TRACING_DIR="$SYSFS_DEBUG_DIR/tracing"
# Kselftest framework requirement - SKIP code is 4
ksft_skip=4
@ -62,6 +63,9 @@ function push_config() {
awk -F'[: ]' '{print "file " $1 " line " $2 " " $4}')
FTRACE_ENABLED=$(sysctl --values kernel.ftrace_enabled)
KPROBE_ENABLED=$(cat "$SYSFS_KPROBES_DIR/enabled")
TRACING_ON=$(cat "$SYSFS_TRACING_DIR/tracing_on")
CURRENT_TRACER=$(cat "$SYSFS_TRACING_DIR/current_tracer")
FTRACE_FILTER=$(cat "$SYSFS_TRACING_DIR/set_ftrace_filter")
}
function pop_config() {
@ -74,6 +78,17 @@ function pop_config() {
if [[ -n "$KPROBE_ENABLED" ]]; then
echo "$KPROBE_ENABLED" > "$SYSFS_KPROBES_DIR/enabled"
fi
if [[ -n "$TRACING_ON" ]]; then
echo "$TRACING_ON" > "$SYSFS_TRACING_DIR/tracing_on"
fi
if [[ -n "$CURRENT_TRACER" ]]; then
echo "$CURRENT_TRACER" > "$SYSFS_TRACING_DIR/current_tracer"
fi
if [[ -n "$FTRACE_FILTER" ]]; then
echo "$FTRACE_FILTER" \
| sed -e "/#### all functions enabled ####/d" \
> "$SYSFS_TRACING_DIR/set_ftrace_filter"
fi
}
function set_dynamic_debug() {
@ -351,3 +366,37 @@ function check_sysfs_value() {
die "Unexpected value in $path: $expected_value vs. $value"
fi
}
# cleanup_tracing() - stop and clean up function tracing
function cleanup_tracing() {
echo 0 > "$SYSFS_TRACING_DIR/tracing_on"
echo "" > "$SYSFS_TRACING_DIR/set_ftrace_filter"
echo "nop" > "$SYSFS_TRACING_DIR/current_tracer"
echo "" > "$SYSFS_TRACING_DIR/trace"
}
# trace_function(function) - start tracing of a function
# function - to be traced function
function trace_function() {
local function="$1"; shift
cleanup_tracing
echo "function" > "$SYSFS_TRACING_DIR/current_tracer"
echo "$function" > "$SYSFS_TRACING_DIR/set_ftrace_filter"
echo 1 > "$SYSFS_TRACING_DIR/tracing_on"
}
# check_traced_functions(functions...) - check whether each function appeared in the trace log
# functions - list of functions to be checked
function check_traced_functions() {
local function
for function in "$@"; do
if ! grep -Fwq "$function" "$SYSFS_TRACING_DIR/trace" ; then
die "Function ($function) did not appear in the trace"
fi
done
cleanup_tracing
}