From patchwork Sun Sep 24 13:37:25 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: 144085 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:cae8:0:b0:403:3b70:6f57 with SMTP id r8csp668754vqu; Sun, 24 Sep 2023 06:38:50 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEtm24OoF8Ti2bsNGjwEW4VuxkMvMnqNxzBBE8oLWx9mNKkhYt6KaRDKtuGWv9O0KxIKCZb X-Received: by 2002:a9d:664d:0:b0:6bc:c542:6f75 with SMTP id q13-20020a9d664d000000b006bcc5426f75mr5206961otm.0.1695562730671; Sun, 24 Sep 2023 06:38:50 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1695562730; cv=none; d=google.com; s=arc-20160816; b=m49G6FoJMr7FHK5ZRtYZIXKajbl2svvB5PXuF1OXBnmgqwZHzOqnWYqYFWz+PhBwFY WGzDSQLA9i0P2eZpv2ueoxbcEVbt/1YDIHtHidjknPcFvDkgh/ytHw42HVcpwByPiITR rbc27Ckp966K1EZiKNz12/Ty1b2KZ/36k0693D7nX2O2vo8i3snaPODAF1PKIbzGQ3Tt M2uZWUgfTJUKqhWz0OVHuniXN2D9LAp++O9k9C+vDNi8UJfEEAvRHDGICwzz7476mfik mQI2KutLtzuE4ohT2Utghggkm+jb0jRb1VrkKmYGv/WNUn2vGWwrUBEohz8lrYFcJNAg MRFg== 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=VhM95YRe6GMPdBwvDMBZxRf2nIhl0BnLG4V9YRCq3o4=; fh=SIgps5XdV0XNwjZfT2uAI7g3mrspDldK9Qs8qQAfoa4=; b=ndhvZAc5FZP00uZ2wtSgjuFZe/LRD01FAAHi/PLGJsfQmm6nSL0OzdnMxY81AHMx1/ L/hyUC8U6jausiXzVrNlEEIOSpVcrq/woNn0Riz4cxm+4E4tmVY45HWocto6R6HF6+lZ tws+BcF+FbHEfOmhMRzzEB4UCFbQoYadVdmv0bVsrLdS+CKMmb0sSkW7QxZP3C4kNuK0 5Y5S9CABQfNY1N9Pnn0l5WZcagfK260F8+ptgy6k14qd+q80p7LKmPjRLOTkGDJpsxGN GdtRO3MG9OJmd1RTQsH/H3nrGaUwV0CFI6N53ERreoWxHZFZm5dqj7BXkVZsodoiWotB kF6g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=ZqPcYsbq; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 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 groat.vger.email (groat.vger.email. [2620:137:e000::3:5]) by mx.google.com with ESMTPS id u77-20020a627950000000b0069018a768d7si7857305pfc.385.2023.09.24.06.38.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 Sep 2023 06:38:50 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 as permitted sender) client-ip=2620:137:e000::3:5; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=ZqPcYsbq; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 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 (depot.vger.email [IPv6:2620:137:e000::3:0]) by groat.vger.email (Postfix) with ESMTP id 5793780298B4; Sun, 24 Sep 2023 06:38:47 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at groat.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231241AbjIXNiX (ORCPT + 30 others); Sun, 24 Sep 2023 09:38:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230306AbjIXNh6 (ORCPT ); Sun, 24 Sep 2023 09:37:58 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 87466171B for ; Sun, 24 Sep 2023 06:37:32 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB2F9C433B9; Sun, 24 Sep 2023 13:37:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695562651; bh=zU6UylpWMhPcntmE4WUBkG80m4hiVOExDKzxHQrqwhQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZqPcYsbqMLiLbpcfHCwh07roWj6RSCGhOTxB51sOEG8nlGLfdVQXdMrr6blomR6QZ SuCGpfrfjSRb+y93ncmw10Oz978PpXIvEtJlrWM6pRoWORsgv2wLCjRYHvAU0p31C6 GVhnp3XTxLRED9uh32ukhfRHXrh4+k1+gnP5HOoYfFFJyAZu4otNhFToVm9y2HieYl iAmTpbX+fG+UeQWRUj9ZVp7rbVHma8Hssi8Qcp7BXSfVxuf9mEtpw//tNLW1U6Dcem 9hRCT9cfL3R9u0K359sTpg1ZGlQVnHNpIi3m5CSX5z35uqzD5UNbUiim43xlAU4PGF 1eLs7YeqE8Hxg== 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 , Guo Ren Subject: [PATCH v5 08/12] tracing: Add ftrace_fill_perf_regs() for perf event Date: Sun, 24 Sep 2023 22:37:25 +0900 Message-Id: <169556264478.146934.11293821252078942426.stgit@devnote2> X-Mailer: git-send-email 2.34.1 In-Reply-To: <169556254640.146934.5654329452696494756.stgit@devnote2> References: <169556254640.146934.5654329452696494756.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 X-Spam-Status: No, score=-1.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Sun, 24 Sep 2023 06:38:47 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777926385834379095 X-GMAIL-MSGID: 1777926385834379095 From: Masami Hiramatsu (Google) Add ftrace_fill_perf_regs() which should be compatible with the perf_fetch_caller_regs(). In other words, the pt_regs returned from the ftrace_fill_perf_regs() must satisfy 'user_mode(regs) == false' and can be used for stack tracing. Signed-off-by: Masami Hiramatsu (Google) --- arch/arm64/include/asm/ftrace.h | 7 +++++++ arch/powerpc/include/asm/ftrace.h | 7 +++++++ arch/s390/include/asm/ftrace.h | 5 +++++ arch/x86/include/asm/ftrace.h | 7 +++++++ include/linux/ftrace.h | 31 +++++++++++++++++++++++++++++++ 5 files changed, 57 insertions(+) diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index 5ad24f315d52..5fbe8fe3e8a5 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -148,6 +148,13 @@ ftrace_partial_regs(const struct ftrace_regs *fregs, struct pt_regs *regs) return regs; } +#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \ + (_regs)->pc = (fregs)->pc; \ + (_regs)->regs[29] = (fregs)->fp; \ + (_regs)->sp = (fregs)->sp; \ + (_regs)->pstate = PSR_MODE_EL1h; \ + } while (0) + int ftrace_regs_query_register_offset(const char *name); int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h index 9e5a39b6a311..53fa39ef476b 100644 --- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -52,6 +52,13 @@ static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs * return fregs->regs.msr ? &fregs->regs : NULL; } +#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \ + (_regs)->result = 0; \ + (_regs)->nip = (fregs)->regs.nip; \ + (_regs)->gpr[1] = (fregs)->regs.gpr[1]; \ + asm volatile("mfmsr %0" : "=r" ((_regs)->msr)); \ + } while (0) + static __always_inline void ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, unsigned long ip) diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h index 6de3bf4d0092..94ceb9564d44 100644 --- a/arch/s390/include/asm/ftrace.h +++ b/arch/s390/include/asm/ftrace.h @@ -99,6 +99,11 @@ ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, #define ftrace_regs_query_register_offset(name) \ regs_query_register_offset(name) +#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \ + (_regs)->psw.addr = (fregs)->regs.psw.addr; \ + (_regs)->gprs[15] = (fregs)->regs.gprs[15]; \ + } while (0) + #endif /* CONFIG_FUNCTION_TRACER */ #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h index 897cf02c20b1..800c2af8af01 100644 --- a/arch/x86/include/asm/ftrace.h +++ b/arch/x86/include/asm/ftrace.h @@ -48,6 +48,13 @@ arch_ftrace_get_regs(struct ftrace_regs *fregs) return &fregs->regs; } +#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \ + (_regs)->ip = (fregs)->regs.ip; \ + (_regs)->sp = (fregs)->regs.sp; \ + (_regs)->cs = __KERNEL_CS; \ + (_regs)->flags = 0; \ + } while (0) + #define ftrace_regs_set_instruction_pointer(fregs, _ip) \ do { (fregs)->regs.ip = (_ip); } while (0) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 819511ab75b7..962c3e6c5e3b 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -190,6 +190,37 @@ ftrace_partial_regs(struct ftrace_regs *fregs, struct pt_regs *regs) #endif /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS || CONFIG_HAVE_PT_REGS_TO_FTRACE_REGS_CAST */ +#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS + +/* + * Please define arch dependent pt_regs which compatible to the + * perf_arch_fetch_caller_regs() but based on ftrace_regs. + * This requires + * - user_mode(_regs) returns false (always kernel mode). + * - able to use the _regs for stack trace. + */ +#ifndef arch_ftrace_fill_perf_regs +/* As same as perf_arch_fetch_caller_regs(), do nothing by default */ +#define arch_ftrace_fill_perf_regs(fregs, _regs) do {} while (0) +#endif + +static __always_inline struct pt_regs * +ftrace_fill_perf_regs(struct ftrace_regs *fregs, struct pt_regs *regs) +{ + arch_ftrace_fill_perf_regs(fregs, regs); + return regs; +} + +#else /* !CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ + +static __always_inline struct pt_regs * +ftrace_fill_perf_regs(struct ftrace_regs *fregs, struct pt_regs *regs) +{ + return &fregs->regs; +} + +#endif + /* * When true, the ftrace_regs_{get,set}_*() functions may be used on fregs. * Note: this can be true even when ftrace_get_regs() cannot provide a pt_regs.