From patchwork Mon Jul 11 09:03:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Leizhen (ThunderTown)" X-Patchwork-Id: 12913181 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 94AA3C433EF for ; Mon, 11 Jul 2022 09:06:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; 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=aHpAaev2RCVQnGUfOrLxipCwFd1OjvRAIbrxywFq4uw=; b=MrPSuKNP9MGJj7 gcYZ25deKVjW/iOsgJcwszp5Y3IkvpPiBHOLzoZOPifg+s+xFP85IxDOd+78ti8UakQPT4ZSUqyhj 969f8VS1xg2DjxZW56DrzMS/JARyRSL+PDRqwFQ3lZOReUaGOz3zyF5ztu3jNoksxJK+KT3FhbAwf XRFaz42mpLO53/a6Vq1lLt9/WJ3V+GkdrgIWJ2IsCzuyauL3rdrLCjaGeUlj0yKGUwju26opMu6kY eUAIQwroEuU1GwYgJvcpNSM1K+h48qDiA+LIdQj8icomrpTOEEh7zj5ZFgS+RsdUuhlcunmELmPx9 J7gPyJWJSaY56ddxeuzQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oApMA-00HTS3-IM; Mon, 11 Jul 2022 09:05:30 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oApLX-00HT3V-Pf; Mon, 11 Jul 2022 09:04:53 +0000 Received: from dggpemm500023.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4LhHtB0k8zzTgkG; Mon, 11 Jul 2022 17:01:06 +0800 (CST) Received: from dggpemm500006.china.huawei.com (7.185.36.236) by dggpemm500023.china.huawei.com (7.185.36.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 11 Jul 2022 17:04:43 +0800 Received: from thunder-town.china.huawei.com (10.174.178.55) by dggpemm500006.china.huawei.com (7.185.36.236) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Mon, 11 Jul 2022 17:04:42 +0800 From: Zhen Lei To: Dave Young , Baoquan He , Vivek Goyal , , , Catalin Marinas , Will Deacon , , Jonathan Corbet , CC: Zhen Lei , "Eric W . Biederman" , Randy Dunlap , Feng Zhou , Kefeng Wang , "Chen Zhou" , John Donnelly , Dave Kleikamp Subject: [PATCH v3 2/2] arm64: kdump: Support crashkernel=X fall back to reserve region above DMA zones Date: Mon, 11 Jul 2022 17:03:19 +0800 Message-ID: <20220711090319.1604-3-thunder.leizhen@huawei.com> X-Mailer: git-send-email 2.26.0.windows.1 In-Reply-To: <20220711090319.1604-1-thunder.leizhen@huawei.com> References: <20220711090319.1604-1-thunder.leizhen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.174.178.55] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpemm500006.china.huawei.com (7.185.36.236) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220711_020452_614023_E637E61D X-CRM114-Status: GOOD ( 13.97 ) 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 For crashkernel=X without '@offset', select a region within DMA zones first, and fall back to reserve region above DMA zones. This allows users to use the same configuration on multiple platforms. Signed-off-by: Zhen Lei Acked-by: Baoquan He --- Documentation/admin-guide/kernel-parameters.txt | 2 +- arch/arm64/mm/init.c | 16 +++++++++++++++- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 65a2c3a22a4b57d..cb6a346419a1fe0 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -823,7 +823,7 @@ memory region [offset, offset + size] for that kernel image. If '@offset' is omitted, then a suitable offset is selected automatically. - [KNL, X86-64] Select a region under 4G first, and + [KNL, X86-64, ARM64] Select a region under 4G first, and fall back to reserve region above 4G when '@offset' hasn't been specified. See Documentation/admin-guide/kdump/kdump.rst for further details. diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 5390f361208ccf7..8539598f9e58b4d 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -138,6 +138,7 @@ static void __init reserve_crashkernel(void) unsigned long long crash_max = CRASH_ADDR_LOW_MAX; char *cmdline = boot_command_line; int ret; + bool fixed_base; if (!IS_ENABLED(CONFIG_KEXEC_CORE)) return; @@ -166,15 +167,28 @@ static void __init reserve_crashkernel(void) return; } + fixed_base = !!crash_base; crash_size = PAGE_ALIGN(crash_size); /* User specifies base address explicitly. */ - if (crash_base) + if (fixed_base) crash_max = crash_base + crash_size; +retry: crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, crash_base, crash_max); if (!crash_base) { + /* + * Attempt to fully allocate low memory failed, fall back + * to high memory, the minimum required low memory will be + * reserved later. + */ + if (!fixed_base && (crash_max == CRASH_ADDR_LOW_MAX)) { + crash_max = CRASH_ADDR_HIGH_MAX; + crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE; + goto retry; + } + pr_warn("cannot allocate crashkernel (size:0x%llx)\n", crash_size); return;