From patchwork Mon Nov 21 22:35:57 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tyler Baicar X-Patchwork-Id: 9440251 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 5CEDE606DB for ; Mon, 21 Nov 2016 22:39:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4CAB028823 for ; Mon, 21 Nov 2016 22:39:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4161128ADE; Mon, 21 Nov 2016 22:39:18 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B84E228823 for ; Mon, 21 Nov 2016 22:39:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755124AbcKUWg4 (ORCPT ); Mon, 21 Nov 2016 17:36:56 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:39678 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755102AbcKUWgx (ORCPT ); Mon, 21 Nov 2016 17:36:53 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 7620761569; Mon, 21 Nov 2016 22:36:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1479767807; bh=luq3j0WtU7v8KaOQ2fKZkUdU3dVYRdDFyDj0uqu5JRw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RDIh/Ux2jjMzVbpmGGGal3m2v8tsz72iz2O9fvrnx0mhQAQq0zPzBeElMF+BY/bYP HSkgBXJqJFrBpLoXXDBZBEPyvoaXCTdGV3/9iAOb0CZK7t9QHusnpqlq/XI+xqqkjr x07WYFSCgJBr9lJV9j8pd4faohXs6/EzrR8gOTVM= Received: from tbaicar-lnx.qualcomm.com (unknown [129.46.14.132]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: tbaicar@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id E68F961523; Mon, 21 Nov 2016 22:36:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1479767796; bh=luq3j0WtU7v8KaOQ2fKZkUdU3dVYRdDFyDj0uqu5JRw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VhuayLbXya7cASbLB6mjAp23s+nAvUjGxvePrQOb40IRNK+BtWhkB3RBo1/w0/EgB ywHfbEgapxobX5yfMrtDBRpncOQvCFfgTTa+2moXMyPy7yjCUmRaoSZruMWDNla6Y9 qYI1aiF0Rrh7uj9ilmBIDTbC7N9RaAaYLPfXIRFo= DMARC-Filter: OpenDMARC Filter v1.3.1 smtp.codeaurora.org E68F961523 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: 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, shijie.huang@arm.com, rruigrok@codeaurora.org, paul.gortmaker@windriver.com, tomasz.nowicki@linaro.org, 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, Suzuki.Poulose@arm.com, punit.agrawal@arm.com, astone@redhat.com, harba@codeaurora.org, hanjun.guo@linaro.org Cc: Tyler Baicar Subject: [PATCH V5 04/10] arm64: exception: handle Synchronous External Abort Date: Mon, 21 Nov 2016 15:35:57 -0700 Message-Id: <1479767763-27532-5-git-send-email-tbaicar@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1479767763-27532-1-git-send-email-tbaicar@codeaurora.org> References: <1479767763-27532-1-git-send-email-tbaicar@codeaurora.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.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: Jonathan (Zhixiong) Zhang Signed-off-by: Tyler Baicar 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..9040e1d 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_synchronous_ext_abort_notifier(struct notifier_block *nb); +void unregister_synchronous_ext_abort_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..fcc49f1 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_synchronous_ext_abort_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_register(&sea_handler_chain, nb); +} + +void unregister_synchronous_ext_abort_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_synch_ext_abort(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_synch_ext_abort, 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_synch_ext_abort, SIGBUS, 0, "level 0 SEA (trans tbl walk)" }, + { do_synch_ext_abort, SIGBUS, 0, "level 1 SEA (trans tbl walk)" }, + { do_synch_ext_abort, SIGBUS, 0, "level 2 SEA (trans tbl walk)" }, + { do_synch_ext_abort, SIGBUS, 0, "level 3 SEA (trans tbl walk)" }, + { do_synch_ext_abort, 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_synch_ext_abort, SIGBUS, 0, "level 0 synch parity error" }, + { do_synch_ext_abort, SIGBUS, 0, "level 1 synch parity error" }, + { do_synch_ext_abort, SIGBUS, 0, "level 2 synch parity error" }, + { do_synch_ext_abort, SIGBUS, 0, "level 3 synch parity error" }, { do_bad, SIGBUS, 0, "unknown 32" }, { do_alignment_fault, SIGBUS, BUS_ADRALN, "alignment fault" }, { do_bad, SIGBUS, 0, "unknown 34" },