From patchwork Wed Dec 28 04:36:00 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 9489965 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 732C762AB0 for ; Wed, 28 Dec 2016 04:38:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 42A2220144 for ; Wed, 28 Dec 2016 04:38:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 325102623C; Wed, 28 Dec 2016 04:38:04 +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 AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 2D20621F61 for ; Wed, 28 Dec 2016 04:38:01 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1cM5yi-00067p-6N; Wed, 28 Dec 2016 04:36:40 +0000 Received: from mail-pg0-x22c.google.com ([2607:f8b0:400e:c05::22c]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1cM5yN-0005rl-Sj for linux-arm-kernel@lists.infradead.org; Wed, 28 Dec 2016 04:36:22 +0000 Received: by mail-pg0-x22c.google.com with SMTP id g1so112431863pgn.0 for ; Tue, 27 Dec 2016 20:35:59 -0800 (PST) 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=eVViVloXm3Y1Ij/PX27A1n95LdM2Oy5hxME+XgsVsC8=; b=koPzuKjWg+MtJ+5TLb09NiqFI9/wECKHJ6fdr7eEvv2a9YSMGIgpCSH5FE8rO2i/tJ e/KDMbwkNOV681+jQxTS2rCpQ7X+mFr+4UwuaqQwS5AFBEsGeKs/uTNE+YTn1J2vQYuU ExInVygxWspDp28FRbrO4VfpYp7YtUVADLdy0= 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=eVViVloXm3Y1Ij/PX27A1n95LdM2Oy5hxME+XgsVsC8=; b=UJTOErskVG0E1/mCWVDFlt5TLCMKkf5tO/JVMHPS8WGOzqqfP7KgECKEiD2uv7fucC Fxthrq+kq4Z0qmoGpN1etaarW0sRRNAEESqW4hEIYQIKhhVTyGlyrPncMx5hklEE9vUZ aVYMAYh+uxP1YpfiZ9CeZIq+T2TIqngCYwYS/j5kaRzHInqyPqzLxdXgQ8H7b/0ckC7o H+Jb4OU66AkyQKRPU7qjDDy3ouICxZ+vPcz/JoL46vBRQHFMVVLT1YR03YOSHrDuaB7N fOHySsNcon3Gh76U+3ux4lwc4xRTwLzY0+4fZNYFl12pydOOwsC4H61pJvW0WGwghb8W SRRw== X-Gm-Message-State: AIkVDXL8QQ3ciRl7EIu7/lp3jc0pMKunU28hVzCXUAihWrxIn5850l3u7og59b3d8GSIMoSl X-Received: by 10.84.217.80 with SMTP id e16mr64810710plj.120.1482899758641; Tue, 27 Dec 2016 20:35:58 -0800 (PST) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id b71sm92832331pfj.62.2016.12.27.20.35.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 27 Dec 2016 20:35:58 -0800 (PST) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com Subject: [PATCH v29 3/9] arm64: kdump: reserve memory for crash dump kernel Date: Wed, 28 Dec 2016 13:36:00 +0900 Message-Id: <20161228043605.27470-2-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20161228043347.27358-1-takahiro.akashi@linaro.org> References: <20161228043347.27358-1-takahiro.akashi@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161227_203620_094433_DFE65E37 X-CRM114-Status: GOOD ( 18.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, Pratyush Anand , geoff@infradead.org, kexec@lists.infradead.org, AKASHI Takahiro , james.morse@arm.com, Mark Salter , bauerman@linux.vnet.ibm.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 "crashkernel=" kernel parameter specifies the size (and optionally the start address) of the system ram used by crash dump kernel. reserve_crashkernel() will allocate and reserve the memory at the startup of primary kernel. This memory range will be exported to userspace via: - an entry named "Crash kernel" in /proc/iomem, and - "linux,crashkernel-base" and "linux,crashkernel-size" under /sys/firmware/devicetree/base/chosen Signed-off-by: AKASHI Takahiro Signed-off-by: Mark Salter Signed-off-by: Pratyush Anand Reviewed-by: James Morse Acked-by: Catalin Marinas --- arch/arm64/kernel/setup.c | 7 ++- arch/arm64/mm/init.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 116 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index b051367e2149..4083069057b5 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -31,7 +31,6 @@ #include #include #include -#include #include #include #include @@ -225,6 +224,12 @@ static void __init request_standard_resources(void) kernel_data.end <= res->end) request_resource(res, &kernel_data); } + +#ifdef CONFIG_KEXEC_CORE + /* User space tools will find "Crash kernel" region in /proc/iomem. */ + if (crashk_res.end) + insert_resource(&iomem_resource, &crashk_res); +#endif } u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 65f1241c372c..1d62bf71b531 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -30,12 +30,14 @@ #include #include #include +#include #include #include #include #include #include #include +#include #include #include @@ -76,6 +78,111 @@ static int __init early_initrd(char *p) early_param("initrd", early_initrd); #endif +#ifdef CONFIG_KEXEC_CORE +static unsigned long long crash_size, crash_base; +static struct property crash_base_prop = { + .name = "linux,crashkernel-base", + .length = sizeof(u64), + .value = &crash_base +}; +static struct property crash_size_prop = { + .name = "linux,crashkernel-size", + .length = sizeof(u64), + .value = &crash_size, +}; + +static int __init export_crashkernel(void) +{ + struct device_node *node; + int ret; + + if (!crash_size) + return 0; + + /* Add /chosen/linux,crashkernel-* properties */ + node = of_find_node_by_path("/chosen"); + if (!node) + return -ENOENT; + + /* + * There might be existing crash kernel properties, but we can't + * be sure what's in them, so remove them. + */ + of_remove_property(node, of_find_property(node, + "linux,crashkernel-base", NULL)); + of_remove_property(node, of_find_property(node, + "linux,crashkernel-size", NULL)); + + ret = of_add_property(node, &crash_base_prop); + if (ret) + goto ret_err; + + ret = of_add_property(node, &crash_size_prop); + if (ret) + goto ret_err; + + return 0; + +ret_err: + pr_warn("Exporting crashkernel region to device tree failed\n"); + return ret; +} +late_initcall(export_crashkernel); + +/* + * reserve_crashkernel() - reserves memory for crash kernel + * + * This function reserves memory area given in "crashkernel=" kernel command + * line parameter. The memory reserved is used by dump capture kernel when + * primary kernel is crashing. + */ +static void __init reserve_crashkernel(void) +{ + int ret; + + ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), + &crash_size, &crash_base); + /* no crashkernel= or invalid value specified */ + if (ret || !crash_size) + return; + + if (crash_base == 0) { + /* Current arm64 boot protocol requires 2MB alignment */ + crash_base = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT, + crash_size, SZ_2M); + if (crash_base == 0) { + pr_warn("Unable to allocate crashkernel (size:%llx)\n", + crash_size); + return; + } + } else { + /* User specifies base address explicitly. */ + if (!memblock_is_region_memory(crash_base, crash_size) || + memblock_is_region_reserved(crash_base, crash_size)) { + pr_warn("crashkernel has wrong address or size\n"); + return; + } + + if (!IS_ALIGNED(crash_base, SZ_2M)) { + pr_warn("crashkernel base address is not 2MB aligned\n"); + return; + } + } + memblock_reserve(crash_base, crash_size); + + pr_info("Reserving %lldMB of memory at %lldMB for crashkernel\n", + crash_size >> 20, crash_base >> 20); + + crashk_res.start = crash_base; + crashk_res.end = crash_base + crash_size - 1; +} +#else +static void __init reserve_crashkernel(void) +{ + ; +} +#endif /* CONFIG_KEXEC_CORE */ + /* * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It * currently assumes that for memory starting above 4G, 32-bit devices will @@ -331,6 +438,9 @@ void __init arm64_memblock_init(void) arm64_dma_phys_limit = max_zone_dma_phys(); else arm64_dma_phys_limit = PHYS_MASK + 1; + + reserve_crashkernel(); + dma_contiguous_reserve(arm64_dma_phys_limit); memblock_allow_resize();