From patchwork Mon Aug 7 06:48:35 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: 131715 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:c44e:0:b0:3f2:4152:657d with SMTP id w14csp1279200vqr; Mon, 7 Aug 2023 00:27:47 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGK1KX/HzpdBD/4FlVh19u1Z0MPPZQDR5e+DX5ZcYUy91v32lD3LLGClgVQOnKIWwQKkH1k X-Received: by 2002:a17:902:e804:b0:1b9:e091:8037 with SMTP id u4-20020a170902e80400b001b9e0918037mr11136334plg.30.1691393267419; Mon, 07 Aug 2023 00:27:47 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1691393267; cv=none; d=google.com; s=arc-20160816; b=J90F3r1B0aa8rI/IfCTM1sIFtIIAWBThsKpzQ+gfXiMBT2fY2/MyyWIaQpzy6tP0Hn ONeCqHIxskv3HBCYC8AIfd+lfipD3w0LUCEH8Xtg8qY3I+vRxVv+bz156B16IQY+a+wl olKm/l/sbhqEersBiXUO0rIZUDOkD0OyH40gVGGfB3oWCf5gZrUGAO3ZBxecsWzMq4ic zo3ScOZE5wGxdLvqPurR8vSslE5ArTJG5z2RFpp9OkCw3Rd9IhvSZqFPQgMco96AcnaY V0PlnX0fXnU7SjUx4SNOPrFN6krdsZ9k2U6/Hpcts4Zse4GY6TiEZHJBs1uP/4IwvmqF xEwg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=JkyxAiOlgDPtAnDUKrsBuCDS8Ohm4kHhly0Ci83bpcg=; fh=nNLeqPmm07c4DrdDej5z+HdJpmx5SqFFnpeka2nrMVM=; b=mO9BWVvc8VsXrel2sZJYwHL+BTYE//ma/jf16072jg0GDy55CDhNCqjtWPekxJNWsg clYYXgPXuUUcaQ+PfGbx+Rm0/312Sax33hSlk9TIKzNnIaaM1GuS92kDrz7s+yGfy7H3 LRo4Sph8op0UHBAnOLoWEwEp7hDQDFOEWNxGIDy+6oizNYSeJ2EuAJmEUXrYC3spqMil WDRZ6MRLQjfqxi3YiNl+lT4SuCdbBQKV6YYo7QgPTybAfMOjro+PsQ7rPn0Y3VsQx4E9 X0Y9OX078pkX28gECaiBDtgqbpV0/WC8jJrfiFIFTFilwv2k2MXnAq8Sa8RPuUSyTyrh +u9g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=EqTdjRc2; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id q12-20020a170903204c00b001bbb8a61d3dsi2495772pla.562.2023.08.07.00.27.33; Mon, 07 Aug 2023 00:27:47 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=EqTdjRc2; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229484AbjHGGss (ORCPT + 99 others); Mon, 7 Aug 2023 02:48:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230464AbjHGGsp (ORCPT ); Mon, 7 Aug 2023 02:48:45 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFC211B5; Sun, 6 Aug 2023 23:48:42 -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 6B8F461575; Mon, 7 Aug 2023 06:48:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7EBF5C433C7; Mon, 7 Aug 2023 06:48:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1691390921; bh=SiQlHMwFoyoeKMevqlfvNpM+Fch5HFHYgMUbI3rqE9M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EqTdjRc2nJUbqOtf5x4wPAH/dpYCqVFKm1WhPxB+jSb4FCLVn8G6eRHWC/GdKs24R vR37KbsUmwejhY4LETUOi4A071dOMiqH1fu6UF4WuPOtGoRMsOUwkaHsZoB2zXcSDJ ptrl+mFVCoJxHkRWWXo/sdkPBUtmNu5z4uuwOO+7Bz3ITieTaQ8bJ/NM0EfGOD3GPF S9ErRQfoGUnHvJZBW+/Pfk7/f1ijYkK6v+XfNz98irsW5UpBg1rXSefzLZLY2iuhD7 ZEckm446WQxIIhvPEcc41PzTAB1+tCpg7KpodUPfEKh8aliBn71u6QMMrTasLkWNcN Tqmde8E7GByug== From: "Masami Hiramatsu (Google)" To: Alexei Starovoitov , Steven Rostedt , Florent Revest Cc: linux-trace-kernel@vger.kernel.org, LKML , Martin KaFai Lau , bpf , Sven Schnelle , Alexei Starovoitov , Jiri Olsa , Arnaldo Carvalho de Melo , Daniel Borkmann , Alan Maguire , Mark Rutland , Peter Zijlstra , Thomas Gleixner Subject: [RFC PATCH v2 1/6] fprobe: Use fprobe_regs in fprobe entry handler Date: Mon, 7 Aug 2023 15:48:35 +0900 Message-Id: <169139091575.324433.13168120610633669432.stgit@devnote2> X-Mailer: git-send-email 2.34.1 In-Reply-To: <169139090386.324433.6412259486776991296.stgit@devnote2> References: <169139090386.324433.6412259486776991296.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773554386788148365 X-GMAIL-MSGID: 1773554386788148365 From: Masami Hiramatsu (Google) This allows fprobes to be available with CONFIG_DYNAMIC_FTRACE_WITH_ARGS instead of CONFIG_DYNAMIC_FTRACE_WITH_REGS, then we can enable fprobe on arm64. Signed-off-by: Masami Hiramatsu (Google) --- include/linux/fprobe.h | 2 +- kernel/trace/Kconfig | 3 ++- kernel/trace/bpf_trace.c | 10 +++++++--- kernel/trace/fprobe.c | 2 +- kernel/trace/trace_fprobe.c | 6 +++++- lib/test_fprobe.c | 4 ++-- samples/fprobe/fprobe_example.c | 2 +- 7 files changed, 19 insertions(+), 10 deletions(-) diff --git a/include/linux/fprobe.h b/include/linux/fprobe.h index 3e03758151f4..36c0595f7b93 100644 --- a/include/linux/fprobe.h +++ b/include/linux/fprobe.h @@ -35,7 +35,7 @@ struct fprobe { int nr_maxactive; int (*entry_handler)(struct fprobe *fp, unsigned long entry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *regs, void *entry_data); void (*exit_handler)(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct pt_regs *regs, diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig index 61c541c36596..976fd594b446 100644 --- a/kernel/trace/Kconfig +++ b/kernel/trace/Kconfig @@ -287,7 +287,7 @@ config DYNAMIC_FTRACE_WITH_ARGS config FPROBE bool "Kernel Function Probe (fprobe)" depends on FUNCTION_TRACER - depends on DYNAMIC_FTRACE_WITH_REGS + depends on DYNAMIC_FTRACE_WITH_REGS || DYNAMIC_FTRACE_WITH_ARGS depends on HAVE_RETHOOK select RETHOOK default n @@ -672,6 +672,7 @@ config FPROBE_EVENTS select TRACING select PROBE_EVENTS select DYNAMIC_EVENTS + depends on DYNAMIC_FTRACE_WITH_REGS default y help This allows user to add tracing events on the function entry and diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 5f2dcabad202..51573eaa04c4 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2460,7 +2460,7 @@ static int __init bpf_event_init(void) fs_initcall(bpf_event_init); #endif /* CONFIG_MODULES */ -#ifdef CONFIG_FPROBE +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS struct bpf_kprobe_multi_link { struct bpf_link link; struct fprobe fp; @@ -2652,10 +2652,14 @@ kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link, static int kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *fregs, void *data) { struct bpf_kprobe_multi_link *link; + struct pt_regs *regs = ftrace_get_regs(fregs); + + if (!regs) + return 0; link = container_of(fp, struct bpf_kprobe_multi_link, fp); kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs); @@ -2910,7 +2914,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr kvfree(cookies); return err; } -#else /* !CONFIG_FPROBE */ +#else /* !CONFIG_DYNAMIC_FTRACE_WITH_REGS */ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) { return -EOPNOTSUPP; diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index 3b21f4063258..15a2aef92733 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -46,7 +46,7 @@ static inline void __fprobe_handler(unsigned long ip, unsigned long parent_ip, } if (fp->entry_handler) - ret = fp->entry_handler(fp, ip, parent_ip, ftrace_get_regs(fregs), entry_data); + ret = fp->entry_handler(fp, ip, parent_ip, fregs, entry_data); /* If entry_handler returns !0, nmissed is not counted. */ if (rh) { diff --git a/kernel/trace/trace_fprobe.c b/kernel/trace/trace_fprobe.c index dfe2e546acdc..4d3ae79f036e 100644 --- a/kernel/trace/trace_fprobe.c +++ b/kernel/trace/trace_fprobe.c @@ -320,12 +320,16 @@ NOKPROBE_SYMBOL(fexit_perf_func); #endif /* CONFIG_PERF_EVENTS */ static int fentry_dispatcher(struct fprobe *fp, unsigned long entry_ip, - unsigned long ret_ip, struct pt_regs *regs, + unsigned long ret_ip, struct ftrace_regs *fregs, void *entry_data) { struct trace_fprobe *tf = container_of(fp, struct trace_fprobe, fp); + struct pt_regs *regs = ftrace_get_regs(fregs); int ret = 0; + if (!regs) + return 0; + if (trace_probe_test_flag(&tf->tp, TP_FLAG_TRACE)) fentry_trace_func(tf, entry_ip, regs); #ifdef CONFIG_PERF_EVENTS diff --git a/lib/test_fprobe.c b/lib/test_fprobe.c index 24de0e5ff859..ff607babba18 100644 --- a/lib/test_fprobe.c +++ b/lib/test_fprobe.c @@ -40,7 +40,7 @@ static noinline u32 fprobe_selftest_nest_target(u32 value, u32 (*nest)(u32)) static notrace int fp_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { KUNIT_EXPECT_FALSE(current_test, preemptible()); /* This can be called on the fprobe_selftest_target and the fprobe_selftest_target2 */ @@ -81,7 +81,7 @@ static notrace void fp_exit_handler(struct fprobe *fp, unsigned long ip, static notrace int nest_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { KUNIT_EXPECT_FALSE(current_test, preemptible()); return 0; diff --git a/samples/fprobe/fprobe_example.c b/samples/fprobe/fprobe_example.c index 64e715e7ed11..1545a1aac616 100644 --- a/samples/fprobe/fprobe_example.c +++ b/samples/fprobe/fprobe_example.c @@ -50,7 +50,7 @@ static void show_backtrace(void) static int sample_entry_handler(struct fprobe *fp, unsigned long ip, unsigned long ret_ip, - struct pt_regs *regs, void *data) + struct ftrace_regs *fregs, void *data) { if (use_trace) /*