From patchwork Mon Jul 17 15:23:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13315932 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 80E42EB64DC for ; Mon, 17 Jul 2023 15:24:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230512AbjGQPYC (ORCPT ); Mon, 17 Jul 2023 11:24:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56806 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231403AbjGQPYB (ORCPT ); Mon, 17 Jul 2023 11:24:01 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00FE019B1; Mon, 17 Jul 2023 08:23:43 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D082B60FE9; Mon, 17 Jul 2023 15:23:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9639AC433C8; Mon, 17 Jul 2023 15:23:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689607402; bh=gHIJLgbVp3IPB3gkGkxy/IvawUhhWSjYF4p1wpvRtLU=; h=From:To:Cc:Subject:Date:From; b=fqXZ5t4I+z6d4b3GWRKAdh2i6bGmPXXT/2vJMQTEpeT7hjsTxU+8QV9HJS0cQbT1A RbscXA8m+dEco03gEfPnVgQSbTbMrxAukoOy+008DndMQz4HqGAsSFCp7voeuytUhy MYQSAhu7EB7Pv7F4UTIaiInLZXAUmiZm1rS3iqnRpirRbEUEK7vvmJyB737eYJpjI6 4IrF7TEByeiIWHET1Vtrd2LK9ZJoAhPXfRdcStA7fcpRpVIbNAvmDSlv4tCXK1s+Gi jhNUfvREWP3N4lvl8zkVwDMgto29ttQrybvz/kmw4d5Duc5Xah9gfUkKIdke+ugdwZ 4pPMNoRjeC4Fg== From: "Masami Hiramatsu (Google)" To: linux-trace-kernel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Steven Rostedt , mhiramat@kernel.org, Martin KaFai Lau , bpf@vger.kernel.org, Sven Schnelle , Alexei Starovoitov Subject: [PATCH v2 0/9] tracing: Improbe BTF support on probe events Date: Tue, 18 Jul 2023 00:23:17 +0900 Message-Id: <168960739768.34107.15145201749042174448.stgit@devnote2> X-Mailer: git-send-email 2.25.1 User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org Hi, Here is the 2nd version of series to improve the BTF support on probe events. The previous series is here: https://lore.kernel.org/linux-trace-kernel/168699521817.528797.13179901018528120324.stgit@mhiramat.roam.corp.google.com/ In this version, I added a NULL check fix patch [1/9] (which will go to fixes branch) and move BTF related API to kernel/bpf/btf.c [2/9] and add a new BTF API [3/9] so that anyone can reuse it. Also I decided to use '$retval' directly instead of 'retval' pseudo BTF variable for field access at [5/9] because I introduced an idea to choose function 'exit' event automatically if '$retval' is used [7/9]. With that change, we can not use 'retval' because if a function has 'retval' argument, we can not decide 'f func retval' is function exit or entry. Selftest test case [8/9] and document [9/9] are also updated according to those changes. This series can be applied on top of "v6.5-rc2" kernel. You can also get this series from: git://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git topic/fprobe-event-ext Thank you, --- Masami Hiramatsu (Google) (9): tracing/probes: Fix to add NULL check for BTF APIs bpf/btf: tracing: Move finding func-proto API and getting func-param API to BTF bpf/btf: Add a function to search a member of a struct/union tracing/probes: Support BTF based data structure field access tracing/probes: Support BTF field access from $retval tracing/probes: Add string type check with BTF tracing/fprobe-event: Assume fprobe is a return event by $retval selftests/ftrace: Add BTF fields access testcases Documentation: tracing: Update fprobe event example with BTF field Documentation/trace/fprobetrace.rst | 50 ++ include/linux/btf.h | 7 kernel/bpf/btf.c | 83 ++++ kernel/trace/trace_fprobe.c | 58 ++- kernel/trace/trace_probe.c | 402 +++++++++++++++----- kernel/trace/trace_probe.h | 12 + .../ftrace/test.d/dynevent/add_remove_btfarg.tc | 11 + .../ftrace/test.d/dynevent/fprobe_syntax_errors.tc | 6 8 files changed, 503 insertions(+), 126 deletions(-) -- Masami Hiramatsu (Google)