Commit 2ca7cd80 authored by Filipe Xavier's avatar Filipe Xavier Committed by Petr Mladek
Browse files

selftests: livepatch: add new ftrace helpers functions 



Add new ftrace helpers functions cleanup_tracing, trace_function and
check_traced_functions.

Signed-off-by: default avatarFilipe Xavier <felipeaggger@gmail.com>
Acked-by: default avatarMiroslav Benes <mbenes@suse.cz>
Acked-by: default avatarJoe Lawrence <joe.lawrence@redhat.com>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Tested-by: default avatarPetr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20250324-ftrace-sftest-livepatch-v3-1-d9d7cc386c75@gmail.com


Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
parent 33608823

tools/testing/selftests/livepatch/functions.sh

+49 −0
Original line number Diff line number Diff line
@@ -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

}