From patchwork Thu Jan 12 18:15:18 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tyler Baicar X-Patchwork-Id: 9513805 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 91F1A601E5 for ; Thu, 12 Jan 2017 18:16:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8985D286F3 for ; Thu, 12 Jan 2017 18:16:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7DC7C286FC; Thu, 12 Jan 2017 18:16:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0C25F286F3 for ; 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Thu, 12 Jan 2017 18:15:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1484244959; bh=gXE2Dx5a8QDTVnbmdhz8ItFbBs2i9B3bWvxjFN/o4mg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YEiXYGpfBFTrpBKm4FtMBCK28QPzWjAPBFqIIT6eHIK/eONwbHvbGOA6X9XE8Ahwz YJFNqLiPB9mQX0VU2LE6nALfredqQp6LPE9OQ9GeBfaa0wOMtLXDfUJ5BRhIOGg12f P9YAMHzJgK467osS4RJ6g9N3DxYdwyNAiuh52LdI= DMARC-Filter: OpenDMARC Filter v1.3.1 smtp.codeaurora.org 994F361418 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=pass smtp.mailfrom=tbaicar@codeaurora.org From: Tyler Baicar To: christoffer.dall@linaro.org, marc.zyngier@arm.com, pbonzini@redhat.com, rkrcmar@redhat.com, linux@armlinux.org.uk, catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net, lenb@kernel.org, matt@codeblueprint.co.uk, robert.moore@intel.com, lv.zheng@intel.com, nkaje@codeaurora.org, zjzhang@codeaurora.org, mark.rutland@arm.com, james.morse@arm.com, akpm@linux-foundation.org, eun.taik.lee@samsung.com, sandeepa.s.prabhu@gmail.com, labbott@redhat.com, shijie.huang@arm.com, rruigrok@codeaurora.org, paul.gortmaker@windriver.com, tn@semihalf.com, fu.wei@linaro.org, rostedt@goodmis.org, bristot@redhat.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-efi@vger.kernel.org, devel@acpica.org, Suzuki.Poulose@arm.com, punit.agrawal@arm.com, astone@redhat.com, harba@codeaurora.org, hanjun.guo@linaro.org, john.garry@huawei.com, shiju.jose@huawei.com Subject: [PATCH V7 04/10] arm64: exception: handle Synchronous External Abort Date: Thu, 12 Jan 2017 11:15:18 -0700 Message-Id: <1484244924-24786-5-git-send-email-tbaicar@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1484244924-24786-1-git-send-email-tbaicar@codeaurora.org> References: <1484244924-24786-1-git-send-email-tbaicar@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170112_101624_977844_2DECED45 X-CRM114-Status: GOOD ( 12.71 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tyler Baicar MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP SEA exceptions are often caused by an uncorrected hardware error, and are handled when data abort and instruction abort exception classes have specific values for their Fault Status Code. When SEA occurs, before killing the process, go through the handlers registered in the notification list. Update fault_info[] with specific SEA faults so that the new SEA handler is used. Signed-off-by: Tyler Baicar Signed-off-by: Jonathan (Zhixiong) Zhang Signed-off-by: Naveen Kaje --- arch/arm64/include/asm/system_misc.h | 13 ++++++++ arch/arm64/mm/fault.c | 58 +++++++++++++++++++++++++++++------- 2 files changed, 61 insertions(+), 10 deletions(-) diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h index 57f110b..e7f3440 100644 --- a/arch/arm64/include/asm/system_misc.h +++ b/arch/arm64/include/asm/system_misc.h @@ -64,4 +64,17 @@ extern void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd); #endif /* __ASSEMBLY__ */ +/* + * The functions below are used to register and unregister callbacks + * that are to be invoked when a Synchronous External Abort (SEA) + * occurs. An SEA is raised by certain fault status codes that have + * either data or instruction abort as the exception class, and + * callbacks may be registered to parse or handle such hardware errors. + * + * Registered callbacks are run in an interrupt/atomic context. They + * are not allowed to block or sleep. + */ +int register_sea_notifier(struct notifier_block *nb); +void unregister_sea_notifier(struct notifier_block *nb); + #endif /* __ASM_SYSTEM_MISC_H */ diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 05d2bd7..81039c7 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -39,6 +39,22 @@ #include #include +/* + * GHES SEA handler code may register a notifier call here to + * handle HW error record passed from platform. + */ +static ATOMIC_NOTIFIER_HEAD(sea_handler_chain); + +int register_sea_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_register(&sea_handler_chain, nb); +} + +void unregister_sea_notifier(struct notifier_block *nb) +{ + atomic_notifier_chain_unregister(&sea_handler_chain, nb); +} + static const char *fault_name(unsigned int esr); #ifdef CONFIG_KPROBES @@ -480,6 +496,28 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs) return 1; } +/* + * This abort handler deals with Synchronous External Abort. + * It calls notifiers, and then returns "fault". + */ +static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs) +{ + struct siginfo info; + + atomic_notifier_call_chain(&sea_handler_chain, 0, NULL); + + pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n", + fault_name(esr), esr, addr); + + info.si_signo = SIGBUS; + info.si_errno = 0; + info.si_code = 0; + info.si_addr = (void __user *)addr; + arm64_notify_die("", regs, &info, esr); + + return 0; +} + static const struct fault_info { int (*fn)(unsigned long addr, unsigned int esr, struct pt_regs *regs); int sig; @@ -502,22 +540,22 @@ static const struct fault_info { { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 1 permission fault" }, { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 2 permission fault" }, { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 3 permission fault" }, - { do_bad, SIGBUS, 0, "synchronous external abort" }, + { do_sea, SIGBUS, 0, "synchronous external abort" }, { do_bad, SIGBUS, 0, "unknown 17" }, { do_bad, SIGBUS, 0, "unknown 18" }, { do_bad, SIGBUS, 0, "unknown 19" }, - { do_bad, SIGBUS, 0, "synchronous abort (translation table walk)" }, - { do_bad, SIGBUS, 0, "synchronous abort (translation table walk)" }, - { do_bad, SIGBUS, 0, "synchronous abort (translation table walk)" }, - { do_bad, SIGBUS, 0, "synchronous abort (translation table walk)" }, - { do_bad, SIGBUS, 0, "synchronous parity error" }, + { do_sea, SIGBUS, 0, "level 0 SEA (translation table walk)" }, + { do_sea, SIGBUS, 0, "level 1 SEA (translation table walk)" }, + { do_sea, SIGBUS, 0, "level 2 SEA (translation table walk)" }, + { do_sea, SIGBUS, 0, "level 3 SEA (translation table walk)" }, + { do_sea, SIGBUS, 0, "synchronous parity or ECC err" }, { do_bad, SIGBUS, 0, "unknown 25" }, { do_bad, SIGBUS, 0, "unknown 26" }, { do_bad, SIGBUS, 0, "unknown 27" }, - { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk)" }, - { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk)" }, - { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk)" }, - { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk)" }, + { do_sea, SIGBUS, 0, "level 0 synchronous parity error (translation table walk)" }, + { do_sea, SIGBUS, 0, "level 1 synchronous parity error (translation table walk)" }, + { do_sea, SIGBUS, 0, "level 2 synchronous parity error (translation table walk)" }, + { do_sea, SIGBUS, 0, "level 3 synchronous parity error (translation table walk)" }, { do_bad, SIGBUS, 0, "unknown 32" }, { do_alignment_fault, SIGBUS, BUS_ADRALN, "alignment fault" }, { do_bad, SIGBUS, 0, "unknown 34" },