From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DCDC0476CD5; Fri, 7 Aug 2026 15:35:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786116906; cv=none; b=q4sJYIaVWokrCH4ijOv/ZI674tr9WXSwDsEQNsz0Rk561yRw3EWLp8UWDcnErNi6BaQwDQa9YfapPJq8f08d6Bg1Gbf328OZWtBwnnkGzG/nV5BAsfXuDyahaPn/ewn5oibDZFiTXgZO8Cd9oEuJdOGoOBwghfcYFTsoMdDma1Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786116906; c=relaxed/simple; bh=uFwYCq4dS9i1cDpfSsjYU/uwR7licDQdQGDTOVibNng=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=hXtNhE/cCCrUewXO4H3Wb99GPPOgaqyuX3rz/lKxDjoFYJb7THGH0P6n5XLiqOyRbVzvGZlxUZTqEvUxIbJoWn1s4JlqMxsnF2gZiDtBrrH74LdYPd0B2HrXsQNaUWQlZNQvj6DKzj3oSVaMCYnAn70YQaPCfSwnjwDP5fVzllI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=b6zZAUIP; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="b6zZAUIP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1AEA61F00A3A; Fri, 7 Aug 2026 15:35:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786116904; bh=rTZ2A2U9JeVrhrb9UGLIRtlTlSyk6IPrl/ICKF/43nE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=b6zZAUIP00Ik9n0Q+IoJ9TXJ/3OHBZLvmTiGdjvNeE8Pp1JgDs9RBk95vJYx4PIWo y8mfLFVH3K1n63VjHvxTaff8NBTY3zuJyKWHPjYodBo5VqlAxEOZMTtKS5Mai2BdlP QxQZk+jh4+f4ApAwH19VZeDJWsqr6dOC9j4YeEjUPlkGF/uGcwdE3PT5byjEhnApwx sLsjRyI9N29tRvL66b/zLVh17gJBepROFRzg1J+oYQdibl5Cp/3RU1KkUv4bxmwZDt wbl6R8da3BKUkmGKH+sQfPxmoCzmG00149DiYfD/uHI+40pEi5P8w1TRtwDRylWEiK 3tlRCKvBCw3VQ== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Peter Zijlstra , Ingo Molnar , x86@kernel.org Cc: Jinchao Wang , Mathieu Desnoyers , Masami Hiramatsu , Thomas Gleixner , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Alexander Shishkin , Ian Rogers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: [PATCH v12 09/11] selftests: ftrace: Add wprobe trigger testcase Date: Sat, 8 Aug 2026 00:34:58 +0900 Message-ID: <178611689884.237811.7547180621874073837.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178611679753.237811.10190793347982785419.stgit@devnote2> References: <178611679753.237811.10190793347982785419.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Masami Hiramatsu (Google) Add a testcase for checking wprobe trigger. This sets set_wprobe and clear_wprobe triggers on fprobe event and static trace event to monitor memory accesses within the trace-events-sample kernel module. Also add a testcase for verifying wprobe trigger syntax error logging. Link: https://lore.kernel.org/all/59637b96946653393a7ad3c7de094094796b39c2.1785067572.git.wangjinchao600@gmail.com/ Signed-off-by: Masami Hiramatsu (Google) --- Changes in v12: - Add trigger-wprobe-syntax-errors.tc for verifying wprobe trigger syntax error logging. - Fix requires line in trigger-wprobe-syntax-errors.tc so test is not evaluated as unsupported prior to execution. - Define dfd=$arg1 fetcharg on testevent for trigger syntax checks. Changes in v11: - Update testcase to use trace-events-sample kernel module instead of VFS file operations. --- tools/testing/selftests/ftrace/config | 1 .../test.d/trigger/trigger-wprobe-syntax-errors.tc | 31 +++++++ .../ftrace/test.d/trigger/trigger-wprobe.tc | 85 ++++++++++++++++++++ 3 files changed, 117 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe-syntax-errors.tc create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc diff --git a/tools/testing/selftests/ftrace/config b/tools/testing/selftests/ftrace/config index d2f503722020..ecdee77f360f 100644 --- a/tools/testing/selftests/ftrace/config +++ b/tools/testing/selftests/ftrace/config @@ -28,3 +28,4 @@ CONFIG_TRACER_SNAPSHOT=y CONFIG_UPROBES=y CONFIG_UPROBE_EVENTS=y CONFIG_WPROBE_EVENTS=y +CONFIG_WPROBE_TRIGGERS=y diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe-syntax-errors.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe-syntax-errors.tc new file mode 100644 index 000000000000..7e02313cf1c7 --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe-syntax-errors.tc @@ -0,0 +1,31 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: event trigger - test wprobe trigger syntax errors +# requires: dynamic_events error_log "w[:[/][]] [r|w|rw]@[:]":README "f[:[/][]] [%return] []":README + +check_error() { # command-with-error-pos-by-^ + ftrace_errlog_check "wprobe_trigger" "$1" "events/fprobes/testevent/trigger" +} + +# Add a dummy fprobe event to attach triggers to +echo 'f:fprobes/testevent do_sys_open dfd=$arg1' > dynamic_events + +# Add a target wprobe event +echo 'w:watch rw@0:8' >> dynamic_events + +# Test errors on trigger syntax +check_error 'set_wprobe:^non_exist_wprobe:dfd' # WPROBE_NOT_FOUND +check_error 'set_wprobe:^' # WPROBE_NOT_FOUND +check_error 'set_wprobe:watch^' # WPROBE_NEED_FIELD +check_error 'set_wprobe:watch:^non_exist_field' # NO_EVENT_FIELD + +# Enable target wprobe event and test WPROBE_BUSY error +echo 1 > events/wprobes/watch/enable +check_error 'set_wprobe:^watch:dfd' # WPROBE_BUSY +echo 0 > events/wprobes/watch/enable + +# Cleanup +echo '-:watch' >> dynamic_events +echo '-:testevent' >> dynamic_events + +exit 0 diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc new file mode 100644 index 000000000000..4071fe0c878b --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-wprobe.tc @@ -0,0 +1,85 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: event trigger - test wprobe trigger +# requires: dynamic_events "w[:[/][]] [r|w|rw]@[:]":README events/sched/sched_process_fork/trigger + +rmmod trace-events-sample ||: +if ! modprobe trace-events-sample ; then + echo "No trace-events sample module - please make CONFIG_SAMPLE_TRACE_EVENTS=m" + exit_unresolved +fi + +cleanup_wprobe_triggers() { + if [ -f events/fprobes/testevent/trigger ]; then + reset_trigger_file events/fprobes/testevent/trigger || true + fi + if [ -f events/sample-trace/foo_bar_with_fn/trigger ]; then + reset_trigger_file events/sample-trace/foo_bar_with_fn/trigger || true + fi + echo 0 > events/enable 2>/dev/null || true + echo > dynamic_events 2>/dev/null || true + sleep 1 + rmmod trace-events-sample 2>/dev/null || true + return 0 +} + +trap cleanup_wprobe_triggers EXIT + +echo 0 > tracing_on + +# we will skip this test if fprobe is not supported. +if ! grep -Fq "f[:[/][]] [%return] []" README; then + echo "UNRESOLVED: fprobe is not supported" + exit_unresolved +fi + +# we will skip this test if the target function does not exist. +if ! grep -wq "sample_timer_cb" /proc/kallsyms; then + echo "UNRESOLVED: sample_timer_cb not found" + exit_unresolved +fi + +:;: "Add a wprobe event used by trigger" ;: +echo 'w:watch rw@0:8 address=$addr value=$value' > dynamic_events + +:;: "Add events for triggering wprobe" ;: +echo 'f:fprobes/testevent sample_timer_cb timer=t' >> dynamic_events + +:;: "Enable all events before setting triggers" ;: +echo 1 > tracing_on +echo 1 >> events/fprobes/testevent/enable +echo 1 >> events/sample-trace/foo_bar_with_fn/enable + +:;: "Set set_wprobe trigger on testevent" ;: +echo 'set_wprobe:watch:timer' >> events/fprobes/testevent/trigger +cat events/fprobes/testevent/trigger | grep ^set_wprobe + +# Wait for sample_timer_cb to fire and set_wprobe trigger to activate +sleep 2 + +:;: "Check set_wprobe trigger activated the watchpoint" ;: +cat trace | grep watch + +:;: "Set clear_wprobe trigger on foo_bar_with_fn" ;: +echo 'clear_wprobe:watch' >> events/sample-trace/foo_bar_with_fn/trigger +cat events/sample-trace/foo_bar_with_fn/trigger | grep ^clear_wprobe + +# Clear trace and wait to ensure no new watchpoint events are generated +clear_trace +sleep 1 + +:;: "Ensure clear_wprobe trigger deactivated the watchpoint" ;: +! grep -q watch trace + +:;: "Remove wprobe triggers" ;: +echo '!set_wprobe:watch:timer' >> events/fprobes/testevent/trigger +echo '!clear_wprobe:watch' >> events/sample-trace/foo_bar_with_fn/trigger +! grep ^set_wprobe events/fprobes/testevent/trigger +! grep ^clear_wprobe events/sample-trace/foo_bar_with_fn/trigger + +:;: "Disable events and remove dynamic events" ;: +echo 0 > events/enable +echo > dynamic_events +clear_trace + +exit 0