From patchwork Mon Mar 15 13:20:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vincenzo Frascino X-Patchwork-Id: 12139425 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2BF41C433E0 for ; Mon, 15 Mar 2021 13:27:13 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 989AC64EE7 for ; Mon, 15 Mar 2021 13:27:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 989AC64EE7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=EqVI0joReJDcZxdS1OcRYj+kTr98JpFP2KSoXAjtcKY=; b=Q3lJPaMQaYoY3PWwp9od2KYoy bjf3TpjqOVTkqHFc0+FjHqmXhlRc7JKR2NqzAry+1okA79QkkOSu5yT/Jhj02K+IODnccOM7Wg6RI YWk8/LSp/yGSAp461xcU6NF4WuZjp6hy77wkgEaVAcyHELH0bQ1VLR96wVZFwDbMBt77y6OdgcJMy U1aWqDKqXVfK9CMiJH0xsu6dNQ/ErpL89bQUI08b8Mo6QfFoQ9/EaQDts2p7aYDkniZvwjIOFYBdI qtrz4mQmhWavxtUW+ni9XNu7Fdn+MYcbGlPgiQr8FIaAtGfExQT3IiGaZxlwijxm757lNGdcPhVST Ww6qWT2uw==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lLnDx-00FxB7-9V; Mon, 15 Mar 2021 13:25:33 +0000 Received: from foss.arm.com ([217.140.110.172]) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lLnB9-00FwaB-Sz for linux-arm-kernel@lists.infradead.org; Mon, 15 Mar 2021 13:24:44 +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 102BE143D; Mon, 15 Mar 2021 06:20:46 -0700 (PDT) Received: from e119884-lin.cambridge.arm.com (e119884-lin.cambridge.arm.com [10.1.196.72]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2CFEB3F792; Mon, 15 Mar 2021 06:20:44 -0700 (PDT) From: Vincenzo Frascino To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Cc: Vincenzo Frascino , Andrew Morton , Catalin Marinas , Will Deacon , Dmitry Vyukov , Andrey Ryabinin , Alexander Potapenko , Marco Elver , Evgenii Stepanov , Branislav Rankov , Andrey Konovalov , Lorenzo Pieralisi Subject: [PATCH v16 8/9] arm64: mte: Report async tag faults before suspend Date: Mon, 15 Mar 2021 13:20:18 +0000 Message-Id: <20210315132019.33202-9-vincenzo.frascino@arm.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315132019.33202-1-vincenzo.frascino@arm.com> References: <20210315132019.33202-1-vincenzo.frascino@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210315_132440_529315_52BC6331 X-CRM114-Status: GOOD ( 14.35 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When MTE async mode is enabled TFSR_EL1 contains the accumulative asynchronous tag check faults for EL1 and EL0. During the suspend/resume operations the firmware might perform some operations that could change the state of the register resulting in a spurious tag check fault report. Report asynchronous tag faults before suspend and clear the TFSR_EL1 register after resume to prevent this to happen. Cc: Catalin Marinas Cc: Will Deacon Cc: Lorenzo Pieralisi Reviewed-by: Catalin Marinas Reviewed-by: Lorenzo Pieralisi Acked-by: Andrey Konovalov Tested-by: Andrey Konovalov Signed-off-by: Vincenzo Frascino --- arch/arm64/include/asm/mte.h | 4 ++++ arch/arm64/kernel/mte.c | 16 ++++++++++++++++ arch/arm64/kernel/suspend.c | 3 +++ 3 files changed, 23 insertions(+) diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h index 9a929620ca5d..a38abc15186c 100644 --- a/arch/arm64/include/asm/mte.h +++ b/arch/arm64/include/asm/mte.h @@ -41,6 +41,7 @@ void mte_sync_tags(pte_t *ptep, pte_t pte); void mte_copy_page_tags(void *kto, const void *kfrom); void flush_mte_state(void); void mte_thread_switch(struct task_struct *next); +void mte_suspend_enter(void); void mte_suspend_exit(void); long set_mte_ctrl(struct task_struct *task, unsigned long arg); long get_mte_ctrl(struct task_struct *task); @@ -66,6 +67,9 @@ static inline void flush_mte_state(void) static inline void mte_thread_switch(struct task_struct *next) { } +static inline void mte_suspend_enter(void) +{ +} static inline void mte_suspend_exit(void) { } diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c index b6336fbe4c14..820bad94870e 100644 --- a/arch/arm64/kernel/mte.c +++ b/arch/arm64/kernel/mte.c @@ -265,6 +265,22 @@ void mte_thread_switch(struct task_struct *next) mte_check_tfsr_el1(); } +void mte_suspend_enter(void) +{ + if (!system_supports_mte()) + return; + + /* + * The barriers are required to guarantee that the indirect writes + * to TFSR_EL1 are synchronized before we report the state. + */ + dsb(nsh); + isb(); + + /* Report SYS_TFSR_EL1 before suspend entry */ + mte_check_tfsr_el1(); +} + void mte_suspend_exit(void) { if (!system_supports_mte()) diff --git a/arch/arm64/kernel/suspend.c b/arch/arm64/kernel/suspend.c index d7564891ffe1..6fdc8292b4f5 100644 --- a/arch/arm64/kernel/suspend.c +++ b/arch/arm64/kernel/suspend.c @@ -91,6 +91,9 @@ int cpu_suspend(unsigned long arg, int (*fn)(unsigned long)) unsigned long flags; struct sleep_stack_data state; + /* Report any MTE async fault before going to suspend */ + mte_suspend_enter(); + /* * From this point debug exceptions are disabled to prevent * updates to mdscr register (saved and restored along with