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 3A01325B09E; Wed, 1 Jul 2026 13:46:04 +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=1782913566; cv=none; b=WKf1GEe4FAC8Zwe34VOHw3XO3KWc1wTtM0rFcuv6gQQzBKS67dbMqT/QwZ5DByny+rKcXYDBiGCQ75g+WEHFa7RapMy4Q+O+Mz3w/RuLegZuOxhtG2fF0ts6EozT0DHxJ3ytrw6H5zGr1bsNyolK+vUG7F7Q4fxg9Nt3Q2IAxSs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782913566; c=relaxed/simple; bh=HLU8OIArXV3mbsdJlZe5UUck7Pp5tiyeL9y3YxVzorg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=CworTH6BQd3rCGzpA4kxfRb2BZoaA8ae7W6PmjC+mbWzbSnfvhw/3N/q9VAUQmwtS/DC57pwZNGpS5mHBdCQkuSeYGLXH9pdtiRe+Oz9HQD/9ZglFuiAEydSSYNzeyygyR98NyPUpi+0h4P36y2cNI/9G91RYaJpTiPA0Ub1K4Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=c3wKxvRp; 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="c3wKxvRp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F1F21F000E9; Wed, 1 Jul 2026 13:46:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782913564; bh=Qr809JcwYSpHxRXSCO3Q4RMwS8OcGyNKa91B91Dbwe8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=c3wKxvRpfXFvTI4OTLwLiLskSFkkqQDuMhBaIRwU1GTWRyVi3M4MN4+5Jo3wOpXRe +6b+PzUWfqRREEWuHW7Tz1vEzphqUn05snPFiPbnnYZtT+lyxl+eaxYw7YbUT41ZYF go4XU3jw/FU8SfvRpXNA7fL7jxdPbfucSeVR9hK0Z1UELznZxX3g32AnXYZLijXLKw /EJAiFef3DPO6h1CAZhGN+tmmVh5JPZLCiHvD5lyKKsASed45FtHsF+ZiVRzTxiWH6 UST+QCG3KknLhwzY/8RWWWoVPoPHlOUzw/yJTewcVbb+5xEr95UUw6IIqcLTjAWGlf ydP6XlruHlrgA== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Masami Hiramatsu , Shuah Khan Cc: Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, bpf@vger.kernel.org Subject: [RFC PATCH 4/4] selftests/ftrace: Add a test for eBPF compiled fetchargs Date: Wed, 1 Jul 2026 22:46:00 +0900 Message-ID: <178291356080.1566898.2303910167100203913.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178291352217.1566898.14481561093843379745.stgit@devnote2> References: <178291352217.1566898.14481561093843379745.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-trace-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 selftest for trace probe BPF compilation to verify that BPF is correctly compiled and executes properly for valid configurations, and falls back to interpreter on unsupported cases. Assisted-by: Antigravity:gemini-3.5-flash Signed-off-by: Masami Hiramatsu --- .../ftrace/test.d/dynevent/test_bpf_fetchargs.tc | 51 ++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/test_bpf_fetchargs.tc diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/test_bpf_fetchargs.tc b/tools/testing/selftests/ftrace/test.d/dynevent/test_bpf_fetchargs.tc new file mode 100644 index 000000000000..6c6f4dd4517a --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/dynevent/test_bpf_fetchargs.tc @@ -0,0 +1,51 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Dynamic event - test eBPF compiled fetchargs for tprobe and fprobe +# requires: dynamic_events "t[:[/][]] []":README + +# Check if the sample module is loaded +if ! lsmod | grep -q trace_events_sample; then + modprobe trace-events-sample || exit_unsupported +fi + +echo 0 > events/enable +echo > dynamic_events +clear_trace + +# Add a tprobe to sample-trace:foo_bar +# foo_bar args: const char *foo, int bar, ... +# So $arg1 is char ptr (points to "hello"), $arg2 is int. +# Let's test REG (arg2) and DEREF (+0($arg1)) +# "hello" in little-endian 32-bit: 'h'(0x68), 'e'(0x65), 'l'(0x6c), 'l'(0x6c) -> 0x6c6c6568 -> 1819043176 +echo "t:test_tprobe foo_bar mybar=\$arg2 myfoo=+0(\$arg1):u32" >> dynamic_events + +# Add an fprobe to __traceiter_foo_bar +if grep -q "__traceiter_foo_bar" /proc/kallsyms; then + # __traceiter_foo_bar args: void *__data, const char *foo, int bar, ... + # $arg1 is __data, $arg2 is foo (points to "hello") + # "hello" in little-endian 32-bit: 'h'(0x68), 'e'(0x65), 'l'(0x6c), 'l'(0x6c) -> 0x6c6c6568 -> 1819043176 + echo "f:test_fprobe __traceiter_foo_bar myfoo=\$arg2 myfmt=+0(\$arg2):u32" >> dynamic_events +fi + +echo 1 > events/sample-trace/foo_bar/enable +echo 1 > events/tracepoints/test_tprobe/enable +if [ -d events/fprobes/test_fprobe ]; then + echo 1 > events/fprobes/test_fprobe/enable +fi + +# Wait for 2 seconds to let the sample thread trigger the events +sleep 2 + +echo 0 > events/enable + +# Now verify the trace +grep -q "test_tprobe.*myfoo=1819043176" trace || exit_fail + +if [ -d events/fprobes/test_fprobe ]; then + grep -q "test_fprobe.*myfmt=1819043176" trace || exit_fail +fi + +echo > dynamic_events +rmmod trace-events-sample + +exit 0