From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AA3BAC76196 for ; Thu, 6 Apr 2023 10:51:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=TY4qUHdaqTTSOA2nuEiUVDJwDSf93eUTfxpNRofGj3k=; b=o5eragVkaku7U8 cHXGcJgf00z1iLIibV2Qr4ActEnGV5T+mpPkycE7GV8GBByZfdBCs62Tyd+gAwKMxA9Z38DL8F+T7 /47MYULbt/xrq+/Wc1cEwP+GQLFvCTRYnnDyMaZhX0hWdVs9vAvCa0vHJmeqxf+jJ+3dWiyywdfSo finFoCD1zYBdaw5cZ+jwHUd2EKAEyoulcm+9XF92Be70LjcaDGHa+wwmdGpWKpa+RsLPVKAWBs5D+ P+n9UtMOOKbjyGq3VpSiPLh4SJ8ecRbdSzlTs7FUSiI8a8WYIz4cTQRQtQ27GxfVWHhdxaM3w+Vf7 2UhkUyYGugAxuKaBWKgw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pkNCB-00760I-0X; Thu, 06 Apr 2023 10:50:23 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pkNC7-0075zk-00 for linux-arm-kernel@lists.infradead.org; Thu, 06 Apr 2023 10:50:20 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A43CA16F8; Thu, 6 Apr 2023 03:51:01 -0700 (PDT) Received: from FVFF77S0Q05N (unknown [10.57.20.171]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 0C0BC3F73F; Thu, 6 Apr 2023 03:50:14 -0700 (PDT) Date: Thu, 6 Apr 2023 11:50:12 +0100 From: Mark Rutland To: Florent Revest Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kpsingh@kernel.org, jolsa@kernel.org, xukuohai@huaweicloud.com, lihuafei1@huawei.com Subject: Re: [PATCH v6 4/5] arm64: ftrace: Add direct call trampoline samples support Message-ID: References: <20230405180250.2046566-1-revest@chromium.org> <20230405180250.2046566-5-revest@chromium.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230405180250.2046566-5-revest@chromium.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230406_035019_153998_46C6E06C X-CRM114-Status: GOOD ( 19.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Apr 05, 2023 at 08:02:49PM +0200, Florent Revest wrote: > The ftrace samples need per-architecture trampoline implementations > to save and restore argument registers around the calls to > my_direct_func* and to restore polluted registers (eg: x30). > > These samples also include which, on arm64, is not > necessary and redefines previously defined macros (resulting in > warnings) so these includes are guarded by !CONFIG_ARM64. > > Signed-off-by: Florent Revest These all look good to me. I gave each module a spin in an 8-vCPU VM on an M1 Macbook Pro with a bunch of other work going on, and all of those worked as expected with sensible output in /sys/kernel/tracing/trace, and no noticeable failures elsewhere. So: Reviewed-by: Mark Rutland Tested-by: Mark Rutland Mark. > --- > arch/arm64/Kconfig | 2 ++ > samples/ftrace/ftrace-direct-modify.c | 34 ++++++++++++++++++ > samples/ftrace/ftrace-direct-multi-modify.c | 40 +++++++++++++++++++++ > samples/ftrace/ftrace-direct-multi.c | 24 +++++++++++++ > samples/ftrace/ftrace-direct-too.c | 26 ++++++++++++++ > samples/ftrace/ftrace-direct.c | 24 +++++++++++++ > 6 files changed, 150 insertions(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index f3503d0cc1b8..c2bf28099abd 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -194,6 +194,8 @@ config ARM64 > !CC_OPTIMIZE_FOR_SIZE) > select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY \ > if DYNAMIC_FTRACE_WITH_ARGS > + select HAVE_SAMPLE_FTRACE_DIRECT > + select HAVE_SAMPLE_FTRACE_DIRECT_MULTI > select HAVE_EFFICIENT_UNALIGNED_ACCESS > select HAVE_FAST_GUP > select HAVE_FTRACE_MCOUNT_RECORD > diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c > index 25fba66f61c0..98d1b7385f08 100644 > --- a/samples/ftrace/ftrace-direct-modify.c > +++ b/samples/ftrace/ftrace-direct-modify.c > @@ -2,7 +2,9 @@ > #include > #include > #include > +#ifndef CONFIG_ARM64 > #include > +#endif > > extern void my_direct_func1(void); > extern void my_direct_func2(void); > @@ -96,6 +98,38 @@ asm ( > > #endif /* CONFIG_S390 */ > > +#ifdef CONFIG_ARM64 > + > +asm ( > +" .pushsection .text, \"ax\", @progbits\n" > +" .type my_tramp1, @function\n" > +" .globl my_tramp1\n" > +" my_tramp1:" > +" bti c\n" > +" sub sp, sp, #16\n" > +" stp x9, x30, [sp]\n" > +" bl my_direct_func1\n" > +" ldp x30, x9, [sp]\n" > +" add sp, sp, #16\n" > +" ret x9\n" > +" .size my_tramp1, .-my_tramp1\n" > + > +" .type my_tramp2, @function\n" > +" .globl my_tramp2\n" > +" my_tramp2:" > +" bti c\n" > +" sub sp, sp, #16\n" > +" stp x9, x30, [sp]\n" > +" bl my_direct_func2\n" > +" ldp x30, x9, [sp]\n" > +" add sp, sp, #16\n" > +" ret x9\n" > +" .size my_tramp2, .-my_tramp2\n" > +" .popsection\n" > +); > + > +#endif /* CONFIG_ARM64 */ > + > static struct ftrace_ops direct; > > static unsigned long my_tramp = (unsigned long)my_tramp1; > diff --git a/samples/ftrace/ftrace-direct-multi-modify.c b/samples/ftrace/ftrace-direct-multi-modify.c > index f72623899602..26956c8fc513 100644 > --- a/samples/ftrace/ftrace-direct-multi-modify.c > +++ b/samples/ftrace/ftrace-direct-multi-modify.c > @@ -2,7 +2,9 @@ > #include > #include > #include > +#ifndef CONFIG_ARM64 > #include > +#endif > > extern void my_direct_func1(unsigned long ip); > extern void my_direct_func2(unsigned long ip); > @@ -103,6 +105,44 @@ asm ( > > #endif /* CONFIG_S390 */ > > +#ifdef CONFIG_ARM64 > + > +asm ( > +" .pushsection .text, \"ax\", @progbits\n" > +" .type my_tramp1, @function\n" > +" .globl my_tramp1\n" > +" my_tramp1:" > +" bti c\n" > +" sub sp, sp, #32\n" > +" stp x9, x30, [sp]\n" > +" str x0, [sp, #16]\n" > +" mov x0, x30\n" > +" bl my_direct_func1\n" > +" ldp x30, x9, [sp]\n" > +" ldr x0, [sp, #16]\n" > +" add sp, sp, #32\n" > +" ret x9\n" > +" .size my_tramp1, .-my_tramp1\n" > + > +" .type my_tramp2, @function\n" > +" .globl my_tramp2\n" > +" my_tramp2:" > +" bti c\n" > +" sub sp, sp, #32\n" > +" stp x9, x30, [sp]\n" > +" str x0, [sp, #16]\n" > +" mov x0, x30\n" > +" bl my_direct_func2\n" > +" ldp x30, x9, [sp]\n" > +" ldr x0, [sp, #16]\n" > +" add sp, sp, #32\n" > +" ret x9\n" > +" .size my_tramp2, .-my_tramp2\n" > +" .popsection\n" > +); > + > +#endif /* CONFIG_ARM64 */ > + > static unsigned long my_tramp = (unsigned long)my_tramp1; > static unsigned long tramps[2] = { > (unsigned long)my_tramp1, > diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c > index 1547c2c6be02..b2ac90e0c02e 100644 > --- a/samples/ftrace/ftrace-direct-multi.c > +++ b/samples/ftrace/ftrace-direct-multi.c > @@ -4,7 +4,9 @@ > #include /* for handle_mm_fault() */ > #include > #include > +#ifndef CONFIG_ARM64 > #include > +#endif > > extern void my_direct_func(unsigned long ip); > > @@ -66,6 +68,28 @@ asm ( > > #endif /* CONFIG_S390 */ > > +#ifdef CONFIG_ARM64 > + > +asm ( > +" .pushsection .text, \"ax\", @progbits\n" > +" .type my_tramp, @function\n" > +" .globl my_tramp\n" > +" my_tramp:" > +" bti c\n" > +" sub sp, sp, #32\n" > +" stp x9, x30, [sp]\n" > +" str x0, [sp, #16]\n" > +" mov x0, x30\n" > +" bl my_direct_func\n" > +" ldp x30, x9, [sp]\n" > +" ldr x0, [sp, #16]\n" > +" add sp, sp, #32\n" > +" ret x9\n" > +" .size my_tramp, .-my_tramp\n" > +" .popsection\n" > +); > + > +#endif /* CONFIG_ARM64 */ > static struct ftrace_ops direct; > > static int __init ftrace_direct_multi_init(void) > diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c > index 71ed4ee8cb4a..38f6f677f913 100644 > --- a/samples/ftrace/ftrace-direct-too.c > +++ b/samples/ftrace/ftrace-direct-too.c > @@ -3,7 +3,9 @@ > > #include /* for handle_mm_fault() */ > #include > +#ifndef CONFIG_ARM64 > #include > +#endif > > extern void my_direct_func(struct vm_area_struct *vma, unsigned long address, > unsigned int flags, struct pt_regs *regs); > @@ -72,6 +74,30 @@ asm ( > > #endif /* CONFIG_S390 */ > > +#ifdef CONFIG_ARM64 > + > +asm ( > +" .pushsection .text, \"ax\", @progbits\n" > +" .type my_tramp, @function\n" > +" .globl my_tramp\n" > +" my_tramp:" > +" bti c\n" > +" sub sp, sp, #48\n" > +" stp x9, x30, [sp]\n" > +" stp x0, x1, [sp, #16]\n" > +" stp x2, x3, [sp, #32]\n" > +" bl my_direct_func\n" > +" ldp x30, x9, [sp]\n" > +" ldp x0, x1, [sp, #16]\n" > +" ldp x2, x3, [sp, #32]\n" > +" add sp, sp, #48\n" > +" ret x9\n" > +" .size my_tramp, .-my_tramp\n" > +" .popsection\n" > +); > + > +#endif /* CONFIG_ARM64 */ > + > static struct ftrace_ops direct; > > static int __init ftrace_direct_init(void) > diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c > index d81a9473b585..e5312f9c15d3 100644 > --- a/samples/ftrace/ftrace-direct.c > +++ b/samples/ftrace/ftrace-direct.c > @@ -3,7 +3,9 @@ > > #include /* for wake_up_process() */ > #include > +#ifndef CONFIG_ARM64 > #include > +#endif > > extern void my_direct_func(struct task_struct *p); > > @@ -63,6 +65,28 @@ asm ( > > #endif /* CONFIG_S390 */ > > +#ifdef CONFIG_ARM64 > + > +asm ( > +" .pushsection .text, \"ax\", @progbits\n" > +" .type my_tramp, @function\n" > +" .globl my_tramp\n" > +" my_tramp:" > +" bti c\n" > +" sub sp, sp, #32\n" > +" stp x9, x30, [sp]\n" > +" str x0, [sp, #16]\n" > +" bl my_direct_func\n" > +" ldp x30, x9, [sp]\n" > +" ldr x0, [sp, #16]\n" > +" add sp, sp, #32\n" > +" ret x9\n" > +" .size my_tramp, .-my_tramp\n" > +" .popsection\n" > +); > + > +#endif /* CONFIG_ARM64 */ > + > static struct ftrace_ops direct; > > static int __init ftrace_direct_init(void) > -- > 2.40.0.577.gac1e443424-goog > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel