From patchwork Mon Jul 9 00:07:50 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 10513411 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 CCD5B6032C for ; Mon, 9 Jul 2018 00:08:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B9CBC289E5 for ; Mon, 9 Jul 2018 00:08:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AC0FE289F2; Mon, 9 Jul 2018 00:08:18 +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=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 2B963289E5 for ; Mon, 9 Jul 2018 00:08:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=VEvqN9LV2UGsGYy3KxmOyR5Wg63BbFW0+EwwzUWqqVU=; b=a6mPCQnCnC7Ke9k14I8mfCj66z IFWNQfbytj6vF/jVJxkUOX4f7ZE+jDDbL0KlEnt1DrphJtofqdtZktUAZPrz4xeKh61Gwlv5YGlZy 3l2TYSxgMA+6Ygva9rtYk634KG/2w3T4LXccKDGs5gr7tkeGluGYOvIUL9zc8HVkv6EiLztQxtH6w VlRsK9LYAzBuCqKANoyWD7Qh4jGMGof/IT7vOAh837dJdbfdDp+IG3JUSL1he/uTSFuwWD3+kePFC CsfrbxAosGZhR6LjFoMo+qibN4K8S/xzjt74tDHfomcFpBnyc6h7xnY16eIQGn2BCla1ZZFML0UGU zXFo8tCw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fcJit-0001BO-6a; Mon, 09 Jul 2018 00:08:11 +0000 Received: from mail-pl0-x242.google.com ([2607:f8b0:400e:c01::242]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fcJiW-0000PF-Oh for linux-arm-kernel@lists.infradead.org; Mon, 09 Jul 2018 00:07:56 +0000 Received: by mail-pl0-x242.google.com with SMTP id m16-v6so5168897pls.11 for ; Sun, 08 Jul 2018 17:07:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=8W7o3oy86/J1tw2fkmeq5q6MVz6b0M86D1KTHsBktO0=; b=ViiOmf3qla3FWhgYVb1QC3TQlEDThtN0RYP1qRcmdogabGTBFgsv4XJqOBdJwhdZ4p CRp6w2AdGh50x9VMErERs2S70JeHKMt0ZTr6EYLsSyKSlYUK14JAHcCiYYqjGD329nRf W47Av0ybpacnFJQbvo7xT8/ZWxIB5+sTIQ2EA= 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; bh=8W7o3oy86/J1tw2fkmeq5q6MVz6b0M86D1KTHsBktO0=; b=SizuB5ineTdi02U0ME3P8dq+tgPLmjjdMtoeUZ+oKOuclYiJ9geYweo22vGO+NuRDh 0ApgoyQBpMeNyI0FU4k0x1hjrtZm90P+fogxJXstQ91K07zhAng+xg9qZnuyGo1m5elb hTH/DuR2QFMTHC3p1OwEMN46Vv0kIMDaKXw25b1qdA7c7Kh6Zb4/myN/GSRcN/suw6Xs m/+Zi0EVX9qFnniviZ1uNlnsDOjigIdCBRmOnKkBtNFjBU/e+ovOW+uV1l/tY31U6MhP H3s3qU+g4WWSMhYLhpTqItSSofIj6H5FrLGZJLrKTYWagMWk4q9ZQr1PfrlWoGL5W1js g0KQ== X-Gm-Message-State: APt69E1nJwoM1/OqqUj11cAw43ijuSjZTBYF77shEXgxfaFNrvcoKB1D wstuG/6pxBsnhk3xnn3jntUw7g== X-Google-Smtp-Source: AAOMgpcmDAi5bUPUDVSabhU697NZLzutFemokLfqRkcM11/fXwY5/Rqllyhys0UXDK+IX7rdQ9vGQQ== X-Received: by 2002:a17:902:9681:: with SMTP id n1-v6mr18955431plp.244.1531094857906; Sun, 08 Jul 2018 17:07:37 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id h12-v6sm20583512pfi.114.2018.07.08.17.07.37 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 08 Jul 2018 17:07:37 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, ard.biesheuvel@linaro.org Subject: [PATCH v3 3/3] arm64: acpi: fix alignment fault in accessing ACPI Date: Mon, 9 Jul 2018 09:07:50 +0900 Message-Id: <20180709000750.22172-4-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180709000750.22172-1-takahiro.akashi@linaro.org> References: <20180709000750.22172-1-takahiro.akashi@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180708_170749_349720_2D961E89 X-CRM114-Status: GOOD ( 18.31 ) 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: mark.rutland@arm.com, lorenzo.pieralisi@arm.com, graeme.gregory@linaro.org, al.stone@linaro.org, bhsharma@redhat.com, tbaicar@codeaurora.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, AKASHI Takahiro , james.morse@arm.com, hanjun.guo@linaro.org, sudeep.holla@arm.com, dyoung@redhat.com, linux-arm-kernel@lists.infradead.org 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 This is a fix against the issue that crash dump kernel may hang up during booting, which can happen on any ACPI-based system with "ACPI Reclaim Memory." (kernel messages after panic kicked off kdump) (snip...) Bye! (snip...) ACPI: Core revision 20170728 pud=000000002e7d0003, *pmd=000000002e7c0003, *pte=00e8000039710707 Internal error: Oops: 96000021 [#1] SMP Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.0-rc6 #1 task: ffff000008d05180 task.stack: ffff000008cc0000 PC is at acpi_ns_lookup+0x25c/0x3c0 LR is at acpi_ds_load1_begin_op+0xa4/0x294 (snip...) Process swapper/0 (pid: 0, stack limit = 0xffff000008cc0000) Call trace: (snip...) [] acpi_ns_lookup+0x25c/0x3c0 [] acpi_ds_load1_begin_op+0xa4/0x294 [] acpi_ps_build_named_op+0xc4/0x198 [] acpi_ps_create_op+0x14c/0x270 [] acpi_ps_parse_loop+0x188/0x5c8 [] acpi_ps_parse_aml+0xb0/0x2b8 [] acpi_ns_one_complete_parse+0x144/0x184 [] acpi_ns_parse_table+0x48/0x68 [] acpi_ns_load_table+0x4c/0xdc [] acpi_tb_load_namespace+0xe4/0x264 [] acpi_load_tables+0x48/0xc0 [] acpi_early_init+0x9c/0xd0 [] start_kernel+0x3b4/0x43c Code: b9008fb9 2a000318 36380054 32190318 (b94002c0) ---[ end trace c46ed37f9651c58e ]--- Kernel panic - not syncing: Fatal exception Rebooting in 10 seconds.. (diagnosis) * This fault is a data abort, alignment fault (ESR=0x96000021) during reading out ACPI table. * Initial ACPI tables are normally stored in system ram and marked as "ACPI Reclaim memory" by the firmware. * After the commit f56ab9a5b73c ("efi/arm: Don't mark ACPI reclaim memory as MEMBLOCK_NOMAP"), those regions are differently handled as they are "memblock-reserved", without NOMAP bit. * So they are now excluded from device tree's "usable-memory-range" which kexec-tools determines based on a current view of /proc/iomem. * When crash dump kernel boots up, it tries to accesses ACPI tables by mapping them with ioremap(), not ioremap_cache(), in acpi_os_ioremap() since they are no longer part of mapped system ram. * Given that ACPI accessor/helper functions are compiled in without unaligned access support (ACPI_MISALIGNMENT_NOT_SUPPORTED), any unaligned access to ACPI tables can cause a fatal panic. With this patch, acpi_os_ioremap() always honors memory attribute information provided by the firmware (EFI) and retaining cacheability allows the kernel safe access to ACPI tables. Signed-off-by: AKASHI Takahiro Reviewed-by: James Morse Reviewed-by: Ard Biesheuvel Reported-by and Tested-by: Bhupesh Sharma --- arch/arm64/include/asm/acpi.h | 23 ++++++++++++++++------- arch/arm64/kernel/acpi.c | 11 +++-------- 2 files changed, 19 insertions(+), 15 deletions(-) diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index 0db62a4cbce2..68bc18cb2b85 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -12,10 +12,12 @@ #ifndef _ASM_ACPI_H #define _ASM_ACPI_H +#include #include #include #include +#include #include #include @@ -29,18 +31,22 @@ /* Basic configuration for ACPI */ #ifdef CONFIG_ACPI +pgprot_t __acpi_get_mem_attribute(phys_addr_t addr); + /* ACPI table mapping after acpi_permanent_mmap is set */ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) { + /* For normal memory we already have a cacheable mapping. */ + if (memblock_is_map_memory(phys)) + return (void __iomem *)__phys_to_virt(phys); + /* - * EFI's reserve_regions() call adds memory with the WB attribute - * to memblock via early_init_dt_add_memory_arch(). + * We should still honor the memory's attribute here because + * crash dump kernel possibly excludes some ACPI (reclaim) + * regions from memblock list. */ - if (!memblock_is_memory(phys)) - return ioremap(phys, size); - - return ioremap_cache(phys, size); + return __ioremap(phys, size, __acpi_get_mem_attribute(phys)); } #define acpi_os_ioremap acpi_os_ioremap @@ -129,7 +135,10 @@ static inline const char *acpi_get_enable_method(int cpu) * for compatibility. */ #define acpi_disable_cmcff 1 -pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr); +static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr) +{ + return __acpi_get_mem_attribute(addr); +} #endif /* CONFIG_ACPI_APEI */ #ifdef CONFIG_ACPI_NUMA diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c index 7b09487ff8fb..ed46dc188b22 100644 --- a/arch/arm64/kernel/acpi.c +++ b/arch/arm64/kernel/acpi.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -29,13 +30,9 @@ #include #include +#include #include -#ifdef CONFIG_ACPI_APEI -# include -# include -#endif - int acpi_noirq = 1; /* skip ACPI IRQ initialization */ int acpi_disabled = 1; EXPORT_SYMBOL(acpi_disabled); @@ -239,8 +236,7 @@ void __init acpi_boot_table_init(void) } } -#ifdef CONFIG_ACPI_APEI -pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr) +pgprot_t __acpi_get_mem_attribute(phys_addr_t addr) { /* * According to "Table 8 Map: EFI memory types to AArch64 memory @@ -261,4 +257,3 @@ pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr) return __pgprot(PROT_NORMAL_NC); return __pgprot(PROT_DEVICE_nGnRnE); } -#endif