From patchwork Wed Aug 23 15:16:03 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: 13362752 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 E2969EE49A3 for ; Wed, 23 Aug 2023 15:18:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237032AbjHWPSF (ORCPT ); Wed, 23 Aug 2023 11:18:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45602 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237052AbjHWPSC (ORCPT ); Wed, 23 Aug 2023 11:18:02 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B64510F8; Wed, 23 Aug 2023 08:17:41 -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 BC273646A1; Wed, 23 Aug 2023 15:16:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AEE86C433C8; Wed, 23 Aug 2023 15:16:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692803768; bh=XUnWIvG2GF1W9eYoGRGfvmiM9wn5WNYnK+ukiZ/XFnE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L4bTLvYAis9FElX7EW5jKDI/MZ768XYa656tzXf75Q5JWfna2O26b72HYOQ2+Fy0Z X/NYFUXeMEGwoPLeFrkySgxkc0O3dEWIiu5l3AffrhksWPQ1Ten4Apa1ozEOt2H2hy WTJJLmpMw9QcdlHPPu2TSy/6hIzod9RDfOaULiEduJkwNuw3TCGqeNU1vP/uAift+T lt3YOQIZ3ozlunqffM3qDXRj4gKY4+Y+bJZp2/n7uVGZoUWxwaVRhStob4InVYGUv4 ep1CjWxl4XJCAp8Nw+GSdHe/VqFDOLTvUgXVUx9MyOYMlREk3E+FAjMXIBXgwL/E2L H6yeu9UaMcs6Q== 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: [PATCH v4 3/9] tracing: Expose ftrace_regs regardless of CONFIG_FUNCTION_TRACER Date: Thu, 24 Aug 2023 00:16:03 +0900 Message-Id: <169280376296.282662.3179053699894615088.stgit@devnote2> X-Mailer: git-send-email 2.34.1 In-Reply-To: <169280372795.282662.9784422934484459769.stgit@devnote2> References: <169280372795.282662.9784422934484459769.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org From: Masami Hiramatsu (Google) In order to be able to use ftrace_regs even from features unrelated to function tracer (e.g. kretprobe), expose ftrace_regs structures and APIs even if the CONFIG_FUNCTION_TRACER=n. Signed-off-by: Masami Hiramatsu (Google) Acked-by: Florent Revest --- Changes in v3: - arch/s390/include/asm/ftrace.h: hide ftrace_regs parts if CONFIG_FUNCTION_TRACER=n to avoid conflict. - Fixed typo. - Define accessor macros only if HAVE_REGS_AND_STACK_ACCESS_API=y --- arch/s390/include/asm/ftrace.h | 4 +++ include/linux/ftrace.h | 51 +++++++++++++++++++++++----------------- 2 files changed, 33 insertions(+), 22 deletions(-) diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index e5c5cb1207e2..74cd2e8bf660 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -41,6 +41,8 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) return addr; } +#ifdef CONFIG_FUNCTION_TRACER + struct ftrace_regs { struct pt_regs regs; }; @@ -80,6 +82,8 @@ ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, #define ftrace_regs_query_register_offset(name) \ regs_query_register_offset(name) +#endif /* CONFIG_FUNCTION_TRACER */ + #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS /* * When an ftrace registered caller is tracing a function that is diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index aad9cf8876b5..fe335d861f08 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -112,24 +112,44 @@ static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *val } #endif -#ifdef CONFIG_FUNCTION_TRACER - -extern int ftrace_enabled; - -#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS +/* + * If the architecture doesn't support FTRACE_WITH_ARGS or disables function + * tracer, define the default(pt_regs compatible) ftrace_regs. + */ +#if !defined(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS) || !defined(CONFIG_FUNCTION_TRACER) struct ftrace_regs { struct pt_regs regs; }; #define arch_ftrace_get_regs(fregs) (&(fregs)->regs) +#ifdef CONFIG_HAVE_REGS_AND_STACK_ACCESS_API + /* * ftrace_regs_set_instruction_pointer() is to be defined by the architecture * if to allow setting of the instruction pointer from the ftrace_regs when * HAVE_DYNAMIC_FTRACE_WITH_ARGS is set and it supports live kernel patching. */ #define ftrace_regs_set_instruction_pointer(fregs, ip) do { } while (0) -#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ + +#define ftrace_regs_get_instruction_pointer(fregs) \ + instruction_pointer(ftrace_get_regs(fregs)) +#define ftrace_regs_get_argument(fregs, n) \ + regs_get_kernel_argument(ftrace_get_regs(fregs), n) +#define ftrace_regs_get_stack_pointer(fregs) \ + kernel_stack_pointer(ftrace_get_regs(fregs)) +#define ftrace_regs_return_value(fregs) \ + regs_return_value(ftrace_get_regs(fregs)) +#define ftrace_regs_set_return_value(fregs, ret) \ + regs_set_return_value(ftrace_get_regs(fregs), ret) +#define ftrace_override_function_with_return(fregs) \ + override_function_with_return(ftrace_get_regs(fregs)) +#define ftrace_regs_query_register_offset(name) \ + regs_query_register_offset(name) + +#endif /* CONFIG_HAVE_REGS_AND_STACK_ACCESS_API */ + +#endif /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS || !CONFIG_FUNCTION_TRACER */ static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs) { @@ -151,22 +171,9 @@ static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs) return ftrace_get_regs(fregs) != NULL; } -#ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS -#define ftrace_regs_get_instruction_pointer(fregs) \ - instruction_pointer(ftrace_get_regs(fregs)) -#define ftrace_regs_get_argument(fregs, n) \ - regs_get_kernel_argument(ftrace_get_regs(fregs), n) -#define ftrace_regs_get_stack_pointer(fregs) \ - kernel_stack_pointer(ftrace_get_regs(fregs)) -#define ftrace_regs_return_value(fregs) \ - regs_return_value(ftrace_get_regs(fregs)) -#define ftrace_regs_set_return_value(fregs, ret) \ - regs_set_return_value(ftrace_get_regs(fregs), ret) -#define ftrace_override_function_with_return(fregs) \ - override_function_with_return(ftrace_get_regs(fregs)) -#define ftrace_regs_query_register_offset(name) \ - regs_query_register_offset(name) -#endif +#ifdef CONFIG_FUNCTION_TRACER + +extern int ftrace_enabled; typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct ftrace_regs *fregs);