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[2620:137:e000::1:20]) by mx.google.com with ESMTP id l9-20020a170906938900b0092451ed6ef8si4519604ejx.932.2023.03.23.20.35.13; Thu, 23 Mar 2023 20:35:36 -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=@gmail.com header.s=20210112 header.b=QwKiPoPY; 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=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231375AbjCXDeG (ORCPT + 99 others); Thu, 23 Mar 2023 23:34:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230329AbjCXDeA (ORCPT ); Thu, 23 Mar 2023 23:34:00 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CCBD612D; Thu, 23 Mar 2023 20:33:56 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id c18so685765ple.11; Thu, 23 Mar 2023 20:33:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1679628836; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=SuNyNXqOE8MJi82Ss2jr4+2w7Bbh8bl4PPMM+ipEJZg=; b=QwKiPoPY2sBwX1qMThbCtcIkli32kb6pTnveqLIR6/FUR0CnPvXMpm6UQcwe8zw1iO tnNYj38tfYqF2OiaVC+QiDTBesRwi98uV3TOpG97R9vbUvGQ3XA9dxnSuWiyeNoHLDJV sSZ1ROXCtKhrzQvdQgjYOPmg8bLYwN8lPQPdXdVXubE1UO49L/uhwfp+YInwbJ2ta4Mv fCG+4HJt79P1HIo5PUqOBBUs/VHhzPwXO4lZlo1i6yfvh+YEGftqNROdR2RFy7l3S8qs ex+z565PIKVV/ObuQXItC/D5mAiO9JBuJK3nsQDDi7zpNcJI7vaRV4uNy4lrG3t04Qm9 ErEA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679628836; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=SuNyNXqOE8MJi82Ss2jr4+2w7Bbh8bl4PPMM+ipEJZg=; b=dPZS7/uDOmmsPfTvC7nq5Uh6IBoEsSEUXSWMA5J2JEQYgs2WNyVEFvFeZuI72NG/Tk OPqYjoFZma9wPSh7xwvFpRwIRsEDW3rNUqkFMSXeJ3sryapKuD0dcA9pNRuv/e2shGKm +XRocuOHOiefDoMZeKocyu4XflmsNDlGx/8VVH4/RRoncyOqGjQy6qnjiI4rgZqX8kdR XZRyY8OhSgYq0p+uyyfM53PIt8EkXj4mN+IUVED6yuDYkaf5MOeRwIdrUgjyFYik6ElS l9EAHSFXQADkrLgQXkhqie8ZilnUSrQNQmTUEiIN8yGXBuyu3NC0p6AFJ78AdkBBzS/Y vUMA== X-Gm-Message-State: AAQBX9dJvcU0RLcuxl90bp4xVZheG23twB2bFaCrY4TVaFqL1j+aRWsw Ut+EQACRwZrlYpCWAfxl1NQ= X-Received: by 2002:a17:902:e3cb:b0:19c:a866:6a76 with SMTP id r11-20020a170902e3cb00b0019ca8666a76mr908258ple.42.1679628836270; Thu, 23 Mar 2023 20:33:56 -0700 (PDT) Received: from localhost.localdomain ([221.226.144.218]) by smtp.gmail.com with ESMTPSA id h13-20020a170902f7cd00b0019d1f42b00csm13014101plw.17.2023.03.23.20.33.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Mar 2023 20:33:55 -0700 (PDT) From: Song Shuai To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, rostedt@goodmis.org, mhiramat@kernel.org, mark.rutland@arm.com, guoren@kernel.org, e.shatokhin@yadro.com Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Song Shuai Subject: [PATCH V8 1/4] riscv: select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY Date: Fri, 24 Mar 2023 11:33:39 +0800 Message-Id: <20230324033342.3177979-2-suagrfillet@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230324033342.3177979-1-suagrfillet@gmail.com> References: <20230324033342.3177979-1-suagrfillet@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE, 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 lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761218592201661664?= X-GMAIL-MSGID: =?utf-8?q?1761218592201661664?= In RISC-V, -fpatchable-function-entry option is used to support dynamic ftrace in this commit afc76b8b8011 ("riscv: Using PATCHABLE_FUNCTION_ENTRY instead of MCOUNT"). So recordmcount don't have to be called to create the __mcount_loc section before the vmlinux linking. Here selects FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY to tell Makefile not to run recordmcount. Link: https://lore.kernel.org/linux-riscv/CAAYs2=j3Eak9vU6xbAw0zPuoh00rh8v5C2U3fePkokZFibWs2g@mail.gmail.com/T/#t Link: https://lore.kernel.org/linux-riscv/Y4jtfrJt+%2FQ5nMOz@spud/ Signed-off-by: Song Shuai Tested-by: Guo Ren Signed-off-by: Guo Ren Acked-by: Björn Töpel --- arch/riscv/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c5e42cc37604..93d4817c9d73 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -56,6 +56,7 @@ config RISCV select COMMON_CLK select CPU_PM if CPU_IDLE select EDAC_SUPPORT + select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY if DYNAMIC_FTRACE select GENERIC_ARCH_TOPOLOGY select GENERIC_ATOMIC64 if !64BIT select GENERIC_CLOCKEVENTS_BROADCAST if SMP From patchwork Fri Mar 24 03:33:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Shuai X-Patchwork-Id: 74332 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:604a:0:0:0:0:0 with SMTP id j10csp118749wrt; Thu, 23 Mar 2023 20:36:20 -0700 (PDT) X-Google-Smtp-Source: AKy350YxxnFgShqKYJ8ptQHDGJ6i2GYrMrYZexthzoCZbFX71STjNNA72v+sio/gquHC40I6t1jm X-Received: by 2002:a17:907:3f81:b0:93d:bae1:ca9e with SMTP id hr1-20020a1709073f8100b0093dbae1ca9emr1670388ejc.25.1679628979903; Thu, 23 Mar 2023 20:36:19 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1679628979; cv=none; d=google.com; s=arc-20160816; b=SLIENRsTe+zAA8hm32Od7LkgB6zfViowRqRxugv3zWM0GqilPJesd+JwhlM1QAhsT1 3hWME9h/r3zQ4+mT3qsXSs/K8bgVyybKbTtrfxaC/lLf8gQPtvq9sgxFmip5BYiuRyA3 B89Txv9Ej00AhC5kyCCSZWs2itjfL8Rqu/y+cYPlxQBYDCNJNmFIGUjHQ5cZfpODQZhI x7QEsvzQhkUxbb4fHPwj2rlDz66jpit1umckVj7N8WU/9SFNyOYBu8uE80nWt7a/IurO cyes7nn2bouvOJH0A1icFTIFUzlTChpL+ag+OW3ynJrMfFfaHHRREUD4m2uSbiMDsHfz Cffw== 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 :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=DBMhuXkuzqfGM7JwY7d49N4roO7HxhkYhX9LhQdxI38=; b=RwRlWRcE2x3mAs5IkbH8p/iNpgQDHeK0hY+mL6/aRpxeICfwS1kVNirlYNja9fhQty lfUhIUybIOu+eyjq97CoNGk/0wHEYWlp+MXArruURffaabN1g+MT/twyuHYLxC8/Og1h oyZbc3cfeIFChLBgrU+2+1BwjT+PFc2FC98hissmL90aaOhkW72kGWaG8/g9jXUVXBna RrPVbmoBXHujy8hajSL9bdM6sHT4rlgwarbpyy2tWxsmd9Onv1TZi7N/+NXdVjyz8sL1 Mt2Rkb+0IhyNR2tl9BI+qczXeax0EwHQz0czQf2BUfvukYTms/W+bhutOCT5yM8JRCo9 AkeQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=BnvpldfC; 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=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (out1.vger.email. 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If FTRACE_WITH_REGS isn't defined, the enable/disable helpers of ftrace_graph_[regs]_call are revised for serving only ftrace_graph_call in the !FTRACE_WITH_REGS version ftrace_caller. Signed-off-by: Song Shuai Tested-by: Guo Ren Signed-off-by: Guo Ren --- arch/riscv/include/asm/ftrace.h | 11 ++- arch/riscv/kernel/ftrace.c | 30 +++---- arch/riscv/kernel/mcount-dyn.S | 139 +++++++++++++++++++++++--------- 3 files changed, 125 insertions(+), 55 deletions(-) diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h index d47d87c2d7e3..84f856a3286e 100644 --- a/arch/riscv/include/asm/ftrace.h +++ b/arch/riscv/include/asm/ftrace.h @@ -107,7 +107,16 @@ do { \ struct dyn_ftrace; int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ftrace_init_nop ftrace_init_nop -#endif + +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +struct ftrace_ops; +struct ftrace_regs; +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs); +#define ftrace_graph_func ftrace_graph_func +#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ + +#endif /* __ASSEMBLY__ */ #endif /* CONFIG_DYNAMIC_FTRACE */ diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c index 03a6434a8cdd..f5aa24d9e1c1 100644 --- a/arch/riscv/kernel/ftrace.c +++ b/arch/riscv/kernel/ftrace.c @@ -178,32 +178,28 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr, } #ifdef CONFIG_DYNAMIC_FTRACE +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs) +{ + struct pt_regs *regs = arch_ftrace_get_regs(fregs); + unsigned long *parent = (unsigned long *)®s->ra; + + prepare_ftrace_return(parent, ip, frame_pointer(regs)); +} +#else /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ extern void ftrace_graph_call(void); -extern void ftrace_graph_regs_call(void); int ftrace_enable_ftrace_graph_caller(void) { - int ret; - - ret = __ftrace_modify_call((unsigned long)&ftrace_graph_call, - (unsigned long)&prepare_ftrace_return, true, true); - if (ret) - return ret; - - return __ftrace_modify_call((unsigned long)&ftrace_graph_regs_call, + return __ftrace_modify_call((unsigned long)&ftrace_graph_call, (unsigned long)&prepare_ftrace_return, true, true); } int ftrace_disable_ftrace_graph_caller(void) { - int ret; - - ret = __ftrace_modify_call((unsigned long)&ftrace_graph_call, - (unsigned long)&prepare_ftrace_return, false, true); - if (ret) - return ret; - - return __ftrace_modify_call((unsigned long)&ftrace_graph_regs_call, + return __ftrace_modify_call((unsigned long)&ftrace_graph_call, (unsigned long)&prepare_ftrace_return, false, true); } +#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ #endif /* CONFIG_DYNAMIC_FTRACE */ #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ diff --git a/arch/riscv/kernel/mcount-dyn.S b/arch/riscv/kernel/mcount-dyn.S index 125de818d1ba..f26e9f6e2fed 100644 --- a/arch/riscv/kernel/mcount-dyn.S +++ b/arch/riscv/kernel/mcount-dyn.S @@ -57,19 +57,52 @@ .endm #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS - .macro SAVE_ALL + +/** +* SAVE_ABI_REGS - save regs against the pt_regs struct +* +* @all: tell if saving all the regs +* +* If all is set, all the regs will be saved, otherwise only ABI +* related regs (a0-a7,epc,ra and optional s0) will be saved. +* +* After the stack is established, +* +* 0(sp) stores the PC of the traced function which can be accessed +* by &(fregs)->regs->epc in tracing function. Note that the real +* function entry address should be computed with -FENTRY_RA_OFFSET. +* +* 8(sp) stores the function return address (i.e. parent IP) that +* can be accessed by &(fregs)->regs->ra in tracing function. +* +* The other regs are saved at the respective localtion and accessed +* by the respective pt_regs member. +* +* Here is the layout of stack for your reference. +* +* PT_SIZE_ON_STACK -> +++++++++ +* + ..... + +* + t3-t6 + +* + s2-s11+ +* + a0-a7 + --++++-> ftrace_caller saved +* + s1 + + +* + s0 + --+ +* + t0-t2 + + +* + tp + + +* + gp + + +* + sp + + +* + ra + --+ // parent IP +* sp -> + epc + --+ // PC +* +++++++++ +**/ + .macro SAVE_ABI_REGS, all=0 addi sp, sp, -PT_SIZE_ON_STACK REG_S t0, PT_EPC(sp) REG_S x1, PT_RA(sp) - REG_S x2, PT_SP(sp) - REG_S x3, PT_GP(sp) - REG_S x4, PT_TP(sp) - REG_S x5, PT_T0(sp) - REG_S x6, PT_T1(sp) - REG_S x7, PT_T2(sp) - REG_S x8, PT_S0(sp) - REG_S x9, PT_S1(sp) + + // always save the ABI regs + REG_S x10, PT_A0(sp) REG_S x11, PT_A1(sp) REG_S x12, PT_A2(sp) @@ -78,6 +111,18 @@ REG_S x15, PT_A5(sp) REG_S x16, PT_A6(sp) REG_S x17, PT_A7(sp) + + // save the leftover regs + + .if \all == 1 + REG_S x2, PT_SP(sp) + REG_S x3, PT_GP(sp) + REG_S x4, PT_TP(sp) + REG_S x5, PT_T0(sp) + REG_S x6, PT_T1(sp) + REG_S x7, PT_T2(sp) + REG_S x8, PT_S0(sp) + REG_S x9, PT_S1(sp) REG_S x18, PT_S2(sp) REG_S x19, PT_S3(sp) REG_S x20, PT_S4(sp) @@ -92,18 +137,19 @@ REG_S x29, PT_T4(sp) REG_S x30, PT_T5(sp) REG_S x31, PT_T6(sp) + + // save s0 if FP_TEST defined + + .else +#ifdef HAVE_FUNCTION_GRAPH_FP_TEST + REG_S x8, PT_S0(sp) +#endif + .endif .endm - .macro RESTORE_ALL + .macro RESTORE_ABI_REGS, all=0 REG_L t0, PT_EPC(sp) REG_L x1, PT_RA(sp) - REG_L x2, PT_SP(sp) - REG_L x3, PT_GP(sp) - REG_L x4, PT_TP(sp) - REG_L x6, PT_T1(sp) - REG_L x7, PT_T2(sp) - REG_L x8, PT_S0(sp) - REG_L x9, PT_S1(sp) REG_L x10, PT_A0(sp) REG_L x11, PT_A1(sp) REG_L x12, PT_A2(sp) @@ -112,6 +158,15 @@ REG_L x15, PT_A5(sp) REG_L x16, PT_A6(sp) REG_L x17, PT_A7(sp) + + .if \all == 1 + REG_L x2, PT_SP(sp) + REG_L x3, PT_GP(sp) + REG_L x4, PT_TP(sp) + REG_L x6, PT_T1(sp) + REG_L x7, PT_T2(sp) + REG_L x8, PT_S0(sp) + REG_L x9, PT_S1(sp) REG_L x18, PT_S2(sp) REG_L x19, PT_S3(sp) REG_L x20, PT_S4(sp) @@ -127,10 +182,25 @@ REG_L x30, PT_T5(sp) REG_L x31, PT_T6(sp) + .else +#ifdef HAVE_FUNCTION_GRAPH_FP_TEST + REG_L x8, PT_S0(sp) +#endif + .endif addi sp, sp, PT_SIZE_ON_STACK .endm + + .macro PREPARE_ARGS + addi a0, t0, -FENTRY_RA_OFFSET // ip + la a1, function_trace_op + REG_L a2, 0(a1) // op + mv a1, ra // parent_ip + mv a3, sp // fregs + .endm + #endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ +#ifndef CONFIG_DYNAMIC_FTRACE_WITH_REGS ENTRY(ftrace_caller) SAVE_ABI @@ -159,33 +229,28 @@ ftrace_graph_call: jr t0 ENDPROC(ftrace_caller) -#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#else /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ ENTRY(ftrace_regs_caller) - SAVE_ALL - - addi a0, t0, -FENTRY_RA_OFFSET - la a1, function_trace_op - REG_L a2, 0(a1) - mv a1, ra - mv a3, sp + SAVE_ABI_REGS 1 + PREPARE_ARGS ftrace_regs_call: .global ftrace_regs_call call ftrace_stub -#ifdef CONFIG_FUNCTION_GRAPH_TRACER - addi a0, sp, PT_RA - REG_L a1, PT_EPC(sp) - addi a1, a1, -FENTRY_RA_OFFSET -#ifdef HAVE_FUNCTION_GRAPH_FP_TEST - mv a2, s0 -#endif -ftrace_graph_regs_call: - .global ftrace_graph_regs_call + RESTORE_ABI_REGS 1 + jr t0 +ENDPROC(ftrace_regs_caller) + +ENTRY(ftrace_caller) + SAVE_ABI_REGS 0 + PREPARE_ARGS + +ftrace_call: + .global ftrace_call call ftrace_stub -#endif - RESTORE_ALL + RESTORE_ABI_REGS 0 jr t0 -ENDPROC(ftrace_regs_caller) +ENDPROC(ftrace_caller) #endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ From patchwork Fri Mar 24 03:33:41 2023 Content-Type: text/plain; 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[2620:137:e000::1:20]) by mx.google.com with ESMTP id b6-20020aa7cd06000000b00501ea9917c5si3930096edw.74.2023.03.23.20.36.08; Thu, 23 Mar 2023 20:36:32 -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=@gmail.com header.s=20210112 header.b=fpPJUBJY; 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=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231434AbjCXDeS (ORCPT + 99 others); Thu, 23 Mar 2023 23:34:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231355AbjCXDeF (ORCPT ); Thu, 23 Mar 2023 23:34:05 -0400 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 092B228EA1; Thu, 23 Mar 2023 20:34:04 -0700 (PDT) Received: by mail-pj1-x1030.google.com with SMTP id fy10-20020a17090b020a00b0023b4bcf0727so415791pjb.0; Thu, 23 Mar 2023 20:34:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1679628843; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=785nkvLXLOqwUJFTFY6fK6X9RV3Nhiya91FR689lrSE=; b=fpPJUBJY/38xpcsJF34FALF9CVjEQAMWhBPDDm/na6hhnWg/3rU4gJPBftAmERc6cY 0Mc54qaTDoaMYfDgbpR3aWOWcCikvj42q4NnB8xCfh+Q58V41V4GfnrTN8qSx5PWkb89 S5J4GLKqKzOnFxrFU4+xc5gCSzo1mpyKzv9e50p3EQr6byhqi1ELedYgKOuUwV70zPjz 6kyyVG2gHna35IxbLEEvsiuQlCa+3CYoj7sckdLDhqf9H4iHgcE9yUhCEo+874sznLGZ i6o2IAjGcli9kNiHH1arXWxGiN3D/+z20cMolYqVg6dVJYF81/W15SZWUFXFOPAYmcov ceVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679628843; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=785nkvLXLOqwUJFTFY6fK6X9RV3Nhiya91FR689lrSE=; b=p0QFDMZollI3u5HEJdOf8mJ7v0iPIXU9DHhKFuLBQKWMs8DVDwAneA1I4cBMa4qg71 hqz3Tac+x0OnUvDnrkW5zb3nXY1ARKsI/+rYfMLsHc+8QhRqJAWa8qfSJ6u6pB8rqPzw B0ABAa3wLrx9/rOV5EBjPAPiBxxFjueO/9kYQV57ge/KnAOe/emcH/kat9u03eftFZmI +fZlSSGmHzQJtXq9Cx80fol357+QWNHLHk+WQj/Z5+kAxgy8k/fLNCP1kns+Hl9b2Ktm 4P0aSxj+o4nSCZNyXAY0w34wcbHWVW2ZkdYBiUlS23Nl5tYs78M8b4Pyzy3LNeuYrYQA nSXg== X-Gm-Message-State: AAQBX9f2JTv9+EAtdFO75aJRvCA9n2jN/l9LXlzgInq9LeyB43p7MPTC 7onM8EtHqE0Ds7+p1cE1thY= X-Received: by 2002:a17:902:e886:b0:1a0:67b1:a777 with SMTP id w6-20020a170902e88600b001a067b1a777mr1265996plg.61.1679628843698; Thu, 23 Mar 2023 20:34:03 -0700 (PDT) Received: from localhost.localdomain ([221.226.144.218]) by smtp.gmail.com with ESMTPSA id h13-20020a170902f7cd00b0019d1f42b00csm13014101plw.17.2023.03.23.20.34.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Mar 2023 20:34:03 -0700 (PDT) From: Song Shuai To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, rostedt@goodmis.org, mhiramat@kernel.org, mark.rutland@arm.com, guoren@kernel.org, e.shatokhin@yadro.com Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Song Shuai Subject: [PATCH V8 3/4] riscv: ftrace: Add DYNAMIC_FTRACE_WITH_DIRECT_CALLS support Date: Fri, 24 Mar 2023 11:33:41 +0800 Message-Id: <20230324033342.3177979-4-suagrfillet@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230324033342.3177979-1-suagrfillet@gmail.com> References: <20230324033342.3177979-1-suagrfillet@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE, 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 lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761218650421312175?= X-GMAIL-MSGID: =?utf-8?q?1761218650421312175?= This patch adds DYNAMIC_FTRACE_WITH_DIRECT_CALLS support for RISC-V. select the DYNAMIC_FTRACE_WITH_DIRECT_CALLS to provide the register_ftrace_direct[_multi] interfaces allowing users to register the customed trampoline (direct_caller) as the mcount for one or more target functions. And modify_ftrace_direct[_multi] are also provided for modifying direct_caller. To make the direct_caller and the other ftrace hooks (eg. function/fgraph tracer, k[ret]probes) co-exist, a temporary register is nominated to store the address of direct_caller in ftrace_regs_caller. After the setting of the address direct_caller by direct_ops->func and the RESTORE_REGS in ftrace_regs_caller, direct_caller will be jumped to by the `jr` inst. Signed-off-by: Song Shuai Tested-by: Guo Ren Signed-off-by: Guo Ren --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/ftrace.h | 8 ++++++++ arch/riscv/kernel/mcount-dyn.S | 4 ++++ 3 files changed, 13 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 93d4817c9d73..17052b2dc83c 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -137,6 +137,7 @@ config RISCV select UACCESS_MEMCPY if !MMU select ZONE_DMA32 if 64BIT select HAVE_DYNAMIC_FTRACE if !XIP_KERNEL && MMU && $(cc-option,-fpatchable-function-entry=8) + select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL select HAVE_FUNCTION_GRAPH_TRACER diff --git a/arch/riscv/include/asm/ftrace.h b/arch/riscv/include/asm/ftrace.h index 84f856a3286e..84904c1e4369 100644 --- a/arch/riscv/include/asm/ftrace.h +++ b/arch/riscv/include/asm/ftrace.h @@ -114,6 +114,14 @@ struct ftrace_regs; void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct ftrace_regs *fregs); #define ftrace_graph_func ftrace_graph_func + +static inline void +__arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr) +{ + regs->t1 = addr; +} +#define arch_ftrace_set_direct_caller(fregs, addr) \ + __arch_ftrace_set_direct_caller(&(fregs)->regs, addr) #endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ #endif /* __ASSEMBLY__ */ diff --git a/arch/riscv/kernel/mcount-dyn.S b/arch/riscv/kernel/mcount-dyn.S index f26e9f6e2fed..7801c1c8bb5a 100644 --- a/arch/riscv/kernel/mcount-dyn.S +++ b/arch/riscv/kernel/mcount-dyn.S @@ -231,6 +231,7 @@ ENDPROC(ftrace_caller) #else /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ ENTRY(ftrace_regs_caller) + move t1, zero SAVE_ABI_REGS 1 PREPARE_ARGS @@ -239,7 +240,10 @@ ftrace_regs_call: call ftrace_stub RESTORE_ABI_REGS 1 + bnez t1,.Ldirect jr t0 +.Ldirect: + jr t1 ENDPROC(ftrace_regs_caller) ENTRY(ftrace_caller) From patchwork Fri Mar 24 03:33:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Song Shuai X-Patchwork-Id: 74334 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:604a:0:0:0:0:0 with SMTP id j10csp118872wrt; Thu, 23 Mar 2023 20:36:44 -0700 (PDT) X-Google-Smtp-Source: AKy350ZQLfeI4+IwrLh7TLGyPWJoQqguBYPp9ciEtLLtMkQa86J3h5G5sh9bxmL1ZPFD4jK+TO9y X-Received: by 2002:a05:6402:1655:b0:501:d917:d52 with SMTP id s21-20020a056402165500b00501d9170d52mr1339512edx.8.1679629004149; Thu, 23 Mar 2023 20:36:44 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1679629004; cv=none; d=google.com; s=arc-20160816; b=civaL27WY1bW6m0YZ6f2GXBJLWwF+JZAs02pVkYLIH5YrL9I88sem0o9hmedNhIHwJ qWNd1LQRZ1zhzmO1weU3vtTGdhvpr0R0D9sm1uMZXhvz+o3yCdRwwdmyjnve/uQik1L/ AgfqFnkYD8uu8ekKcrN/9gY0r+1/fWDsAJdIavWIZLj4dHL384weQflQfh2I4q9vKNzv JPp3MKr4W5CoJDdiw7CyOZwouT87V5mjmXhnahYARAx9lIxiaQda2FosJTzUB812zmT6 gANXu3iGcJozTo7Pag9V8lV6o23wS7GWRlEogA90kD0tAkHOzgaeQeZGjHdj8oUxvgv7 Fg5Q== 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 :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=h3q26JSTHb9HYIOZ2NkxVcC/C3mDBZ5uwCCl/dONZmQ=; b=wSSN5KekkrCzL8CcBoqwtCSdZOCrY9GH06Vg9OyQWkYgNn16AWRfjSXCbHtSRktXR/ /63uRdVrU+F/hIdu5dXLcu79Hhgw+mN/5itKbc4QitsPmIpnG6c2e8XuhL+YdfNpLe5a m52s0jPCqqV43yu9gOAiO0hL0kKnBGij2dyjKZjmhFKmzN8M5PC4cgdqEMJuq8PmYYjK jEiPNPcDg0NJFUmV4NdOs2JgXQRqswJOHaoKQ0miCG3ROyVqlvJHQc7n7TqzBYI9fdtH Koe/QgN+ghuzEBnXBpb8uCcX0UZSq64nfBSzE5Ci7BeT4Rzt2jYLRqRpZqICXwmil9Ey GBjg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=cuRpWV5c; 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=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (out1.vger.email. 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And add riscv asm code for the ftrace-direct*.c files in samples/ftrace/. Link: https://lore.kernel.org/linux-riscv/c68bac83-5c88-80b1-bac9-e1fd4ea8f07e@yadro.com/T/#ma13012560331c66b051b580b3ab4a04ba44455ec Tested-by: Evgenii Shatokhin Signed-off-by: Song Shuai Tested-by: Guo Ren Signed-off-by: Guo Ren Acked-by: Steven Rostedt (Google) --- arch/riscv/Kconfig | 2 ++ samples/ftrace/ftrace-direct-modify.c | 33 +++++++++++++++++ samples/ftrace/ftrace-direct-multi-modify.c | 39 +++++++++++++++++++++ samples/ftrace/ftrace-direct-multi.c | 23 ++++++++++++ samples/ftrace/ftrace-direct-too.c | 26 ++++++++++++++ samples/ftrace/ftrace-direct.c | 22 ++++++++++++ 6 files changed, 145 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 17052b2dc83c..5b35496ac644 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -115,6 +115,8 @@ config RISCV select HAVE_POSIX_CPU_TIMERS_TASK_WORK select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RSEQ + select HAVE_SAMPLE_FTRACE_DIRECT + select HAVE_SAMPLE_FTRACE_DIRECT_MULTI select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c index d93abbcb1f4c..32f973e7bab1 100644 --- a/samples/ftrace/ftrace-direct-modify.c +++ b/samples/ftrace/ftrace-direct-modify.c @@ -22,6 +22,39 @@ extern void my_tramp2(void *); static unsigned long my_ip = (unsigned long)schedule; +#ifdef CONFIG_RISCV + +asm (" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp1, @function\n" +" .globl my_tramp1\n" +" my_tramp1:\n" +" addi sp,sp,-16\n" +" sd t0,0(sp)\n" +" sd ra,8(sp)\n" +" call my_direct_func1\n" +" ld t0,0(sp)\n" +" ld ra,8(sp)\n" +" addi sp,sp,16\n" +" jr t0\n" +" .size my_tramp1, .-my_tramp1\n" + +" .type my_tramp2, @function\n" +" .globl my_tramp2\n" +" my_tramp2:\n" +" addi sp,sp,-16\n" +" sd t0,0(sp)\n" +" sd ra,8(sp)\n" +" call my_direct_func2\n" +" ld t0,0(sp)\n" +" ld ra,8(sp)\n" +" addi sp,sp,16\n" +" jr t0\n" +" .size my_tramp2, .-my_tramp2\n" +" .popsection\n" +); + +#endif /* CONFIG_RISCV */ + #ifdef CONFIG_X86_64 #include diff --git a/samples/ftrace/ftrace-direct-multi-modify.c b/samples/ftrace/ftrace-direct-multi-modify.c index b58c594efb51..045a4af041ce 100644 --- a/samples/ftrace/ftrace-direct-multi-modify.c +++ b/samples/ftrace/ftrace-direct-multi-modify.c @@ -20,6 +20,45 @@ void my_direct_func2(unsigned long ip) extern void my_tramp1(void *); extern void my_tramp2(void *); +#ifdef CONFIG_RISCV + +asm (" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp1, @function\n" +" .globl my_tramp1\n" +" my_tramp1:\n" +" addi sp,sp,-24\n" +" sd a0,0(sp)\n" +" sd t0,8(sp)\n" +" sd ra,16(sp)\n" +" mv a0,t0\n" +" call my_direct_func1\n" +" ld a0,0(sp)\n" +" ld t0,8(sp)\n" +" ld ra,16(sp)\n" +" addi sp,sp,24\n" +" jr t0\n" +" .size my_tramp1, .-my_tramp1\n" + +" .type my_tramp2, @function\n" +" .globl my_tramp2\n" +" my_tramp2:\n" +" addi sp,sp,-24\n" +" sd a0,0(sp)\n" +" sd t0,8(sp)\n" +" sd ra,16(sp)\n" +" mv a0,t0\n" +" call my_direct_func2\n" +" ld a0,0(sp)\n" +" ld t0,8(sp)\n" +" ld ra,16(sp)\n" +" addi sp,sp,24\n" +" jr t0\n" +" .size my_tramp2, .-my_tramp2\n" +" .popsection\n" +); + +#endif /* CONFIG_RISCV */ + #ifdef CONFIG_X86_64 #include diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c index c27cf130c319..918cf325d3a3 100644 --- a/samples/ftrace/ftrace-direct-multi.c +++ b/samples/ftrace/ftrace-direct-multi.c @@ -15,6 +15,29 @@ void my_direct_func(unsigned long ip) extern void my_tramp(void *); +#ifdef CONFIG_RISCV + +asm (" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp, @function\n" +" .globl my_tramp\n" +" my_tramp:\n" +" addi sp,sp,-24\n" +" sd a0,0(sp)\n" +" sd t0,8(sp)\n" +" sd ra,16(sp)\n" +" mv a0,t0\n" +" call my_direct_func\n" +" ld a0,0(sp)\n" +" ld t0,8(sp)\n" +" ld ra,16(sp)\n" +" addi sp,sp,24\n" +" jr t0\n" +" .size my_tramp, .-my_tramp\n" +" .popsection\n" +); + +#endif /* CONFIG_RISCV */ + #ifdef CONFIG_X86_64 #include diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c index 8139dce2a31c..5a552b710d8c 100644 --- a/samples/ftrace/ftrace-direct-too.c +++ b/samples/ftrace/ftrace-direct-too.c @@ -17,6 +17,32 @@ void my_direct_func(struct vm_area_struct *vma, extern void my_tramp(void *); +#ifdef CONFIG_RISCV + +asm (" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp, @function\n" +" .globl my_tramp\n" +" my_tramp:\n" +" addi sp,sp,-40\n" +" sd a0,0(sp)\n" +" sd a1,8(sp)\n" +" sd a2,16(sp)\n" +" sd t0,24(sp)\n" +" sd ra,32(sp)\n" +" call my_direct_func\n" +" ld a0,0(sp)\n" +" ld a1,8(sp)\n" +" ld a2,16(sp)\n" +" ld t0,24(sp)\n" +" ld ra,32(sp)\n" +" addi sp,sp,40\n" +" jr t0\n" +" .size my_tramp, .-my_tramp\n" +" .popsection\n" +); + +#endif /* CONFIG_RISCV */ + #ifdef CONFIG_X86_64 #include diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c index 1d3d307ca33d..33e7bde013aa 100644 --- a/samples/ftrace/ftrace-direct.c +++ b/samples/ftrace/ftrace-direct.c @@ -14,6 +14,28 @@ void my_direct_func(struct task_struct *p) extern void my_tramp(void *); +#ifdef CONFIG_RISCV + +asm (" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp, @function\n" +" .globl my_tramp\n" +" my_tramp:\n" +" addi sp,sp,-24\n" +" sd a0,0(sp)\n" +" sd t0,8(sp)\n" +" sd ra,16(sp)\n" +" call my_direct_func\n" +" ld a0,0(sp)\n" +" ld t0,8(sp)\n" +" ld ra,16(sp)\n" +" addi sp,sp,24\n" +" jr t0\n" +" .size my_tramp, .-my_tramp\n" +" .popsection\n" +); + +#endif /* CONFIG_RISCV */ + #ifdef CONFIG_X86_64 #include