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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 B29EDC433FF for ; Mon, 5 Aug 2019 06:23:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7DAF6217D9 for ; Mon, 5 Aug 2019 06:23:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=fossix-org.20150623.gappssmtp.com header.i=@fossix-org.20150623.gappssmtp.com header.b="DyTNWuBb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727516AbfHEGXB (ORCPT ); Mon, 5 Aug 2019 02:23:01 -0400 Received: from mail-pg1-f196.google.com ([209.85.215.196]:43995 "EHLO mail-pg1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727476AbfHEGW5 (ORCPT ); Mon, 5 Aug 2019 02:22:57 -0400 Received: by mail-pg1-f196.google.com with SMTP id r26so3203260pgl.10 for ; Sun, 04 Aug 2019 23:22:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fossix-org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=/vBF5JTfDPD1eFNn26nmOgc2qt/ewQKezlZWhxI2nZg=; b=DyTNWuBb4kQvUn1ItwT8CNs4KhYeYQvuWYL2ITj7Q/UjJ75VR8Ph5+HXAEHPLHg8O1 TbmqcgqRAdsoYI40VPkTwdEsCIDTjm/hRbSGuFU+6r8fL85PZHTDD6qNhHklkGsTui3O mZ0ySqOZ7h8o+i4iWUiob7HzWGPOEBvH0STYs3XJZITO14EADR7jAgBOpXwOS4ydqGtC Yx361gNWiRfEcCkGEB6wchEj57s3YCGInlRneNiKkhSg7BEb0cNcWyXESO6DTBi2YvgL lpfwJ0YduRXPK0mGdwK9piEAZHXeNCA8ejUZiim/V8zq41M155xjtqaNsVEwzHA586Zr F3Aw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=/vBF5JTfDPD1eFNn26nmOgc2qt/ewQKezlZWhxI2nZg=; b=B6qSzzcr4Y5+cqe18CkzuXPeS+jIWCgglautOKAUxykWiLWFch5o9eEimIr86YsQG6 I7J0HWdWspkeeo0z+kZciyy+Lgc5MF750SeVg1hXOD/1J86NWyFi4e2krjTlsEfV2Tuf TZ3AMtMvL+HcO0TXmHC1Xw7dLtQupLmPkTGyO9Sxlr6X39r/sgxmoFj3sopuCfy/kL2i tuedtT4Vn208TF66pAECXJMT7x7gstXQFuoL26TFZti3XbwqZyWFQ2I0laAlhnBR87eX XwHqFREch+2xgmBkVLeDzPsRWXSwtLWnqSOQVee57tnpinuPByVWh6lyjW70q0s62hii /4mg== X-Gm-Message-State: APjAAAXTjJFN1JGlX0Ijm/nIdKf+Eu7R1P2rk6/zWF146vWfdEitS0BT 5vTmhA3uXt0P1kW+B41YVhA= X-Google-Smtp-Source: APXvYqyy89fYUgNZK6OF1vscZW+pTf7gtiD+sHVJFBUHgbHjR6/Cj+jqTeTkGoziMfLWzbigC6/XAQ== X-Received: by 2002:a63:e09:: with SMTP id d9mr18349434pgl.442.1564986176422; Sun, 04 Aug 2019 23:22:56 -0700 (PDT) Received: from santosiv.in.ibm.com ([129.41.84.66]) by smtp.gmail.com with ESMTPSA id i14sm124680082pfk.0.2019.08.04.23.22.53 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sun, 04 Aug 2019 23:22:55 -0700 (PDT) From: Santosh Sivaraj To: linuxppc-dev , linux-kernel@vger.kernel.org Cc: "Aneesh Kumar K.V" , Mahesh Salgaonkar , Reza Arbab , Balbir Singh , Chandan Rajendra , Michael Ellerman , Nicholas Piggin , christophe leroy Subject: [PATCH v7 6/7] powerpc/mce: Handle UE event for memcpy_mcsafe Date: Mon, 5 Aug 2019 11:52:24 +0530 Message-Id: <20190805062225.4354-7-santosh@fossix.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190805062225.4354-1-santosh@fossix.org> References: <20190805062225.4354-1-santosh@fossix.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If we take a UE on one of the instructions with a fixup entry, set nip to continue execution at the fixup entry. Stop processing the event further or print it. Based-on-patch-by: Reza Arbab Cc: Reza Arbab Cc: Mahesh Salgaonkar Signed-off-by: Santosh Sivaraj --- arch/powerpc/include/asm/mce.h | 4 +++- arch/powerpc/kernel/mce.c | 13 +++++++++++-- arch/powerpc/kernel/mce_power.c | 15 +++++++++++++-- 3 files changed, 27 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/include/asm/mce.h b/arch/powerpc/include/asm/mce.h index f3a6036b6bc0..e1931c8c2743 100644 --- a/arch/powerpc/include/asm/mce.h +++ b/arch/powerpc/include/asm/mce.h @@ -122,7 +122,8 @@ struct machine_check_event { enum MCE_UeErrorType ue_error_type:8; u8 effective_address_provided; u8 physical_address_provided; - u8 reserved_1[5]; + u8 ignore_event; + u8 reserved_1[4]; u64 effective_address; u64 physical_address; u8 reserved_2[8]; @@ -193,6 +194,7 @@ struct mce_error_info { enum MCE_Initiator initiator:8; enum MCE_ErrorClass error_class:8; bool sync_error; + bool ignore_event; }; #define MAX_MC_EVT 100 diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c index 8c0b471658a7..7a9a0bf6d614 100644 --- a/arch/powerpc/kernel/mce.c +++ b/arch/powerpc/kernel/mce.c @@ -144,6 +144,7 @@ void save_mce_event(struct pt_regs *regs, long handled, if (phys_addr != ULONG_MAX) { mce->u.ue_error.physical_address_provided = true; mce->u.ue_error.physical_address = phys_addr; + mce->u.ue_error.ignore_event = mce_err->ignore_event; } } return; @@ -256,8 +257,13 @@ static void machine_process_ue_event(struct work_struct *work) /* * This should probably queued elsewhere, but * oh! well + * + * Don't report this machine check because the caller has a + * asked us to ignore the event, it has a fixup handler which + * will do the appropriate error handling and reporting. */ - if (evt->error_type == MCE_ERROR_TYPE_UE) { + if (evt->error_type == MCE_ERROR_TYPE_UE && + !evt->u.ue_error.ignore_event) { if (evt->u.ue_error.physical_address_provided) { unsigned long pfn; @@ -291,8 +297,11 @@ static void machine_check_process_queued_event(struct irq_work *work) index = __this_cpu_read(mce_queue_count) - 1; evt = this_cpu_ptr(&mce_event_queue[index]); - if (evt->error_type == MCE_ERROR_TYPE_UE) + if (evt->error_type == MCE_ERROR_TYPE_UE) { machine_check_ue_event(evt); + if (evt->u.ue_error.ignore_event) + return; + } machine_check_print_event_info(evt, false, false); __this_cpu_dec(mce_queue_count); diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c index bed38a8e2e50..36ca45bbb273 100644 --- a/arch/powerpc/kernel/mce_power.c +++ b/arch/powerpc/kernel/mce_power.c @@ -11,6 +11,7 @@ #include #include +#include #include #include #include @@ -18,6 +19,7 @@ #include #include #include +#include /* * Convert an address related to an mm to a physical address. @@ -558,9 +560,18 @@ static int mce_handle_derror(struct pt_regs *regs, return 0; } -static long mce_handle_ue_error(struct pt_regs *regs) +static long mce_handle_ue_error(struct pt_regs *regs, + struct mce_error_info *mce_err) { long handled = 0; + const struct exception_table_entry *entry; + + entry = search_kernel_exception_table(regs->nip); + if (entry) { + mce_err->ignore_event = true; + regs->nip = extable_fixup(entry); + return 1; + } /* * On specific SCOM read via MMIO we may get a machine check @@ -593,7 +604,7 @@ static long mce_handle_error(struct pt_regs *regs, &phys_addr); if (!handled && mce_err.error_type == MCE_ERROR_TYPE_UE) - handled = mce_handle_ue_error(regs); + handled = mce_handle_ue_error(regs, &mce_err); save_mce_event(regs, handled, &mce_err, regs->nip, addr, phys_addr); -- 2.20.1