From patchwork Tue Feb 7 08:08:55 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 9559343 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 35CF360216 for ; Tue, 7 Feb 2017 08:09:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 27820204C2 for ; Tue, 7 Feb 2017 08:09:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1A5E820410; Tue, 7 Feb 2017 08:09:04 +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=-1.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, T_DKIM_INVALID autolearn=no version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A461E20410 for ; Tue, 7 Feb 2017 08:09:03 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cb0pg-0004gk-L3; Tue, 07 Feb 2017 08:09:00 +0000 Received: from mail-pf0-f174.google.com ([209.85.192.174]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cb0pZ-0004Fd-LW for linux-arm-kernel@lists.infradead.org; Tue, 07 Feb 2017 08:08:56 +0000 Received: by mail-pf0-f174.google.com with SMTP id f144so31327149pfa.2 for ; Tue, 07 Feb 2017 00:08:33 -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=lEiloDe4dConduj6mOwyWGwTLxlbkQVDVX2fK5RnvYM=; b=O4lkSxY38zqGtEeVP3JppY0Ty/tMCkyuNgKc3jO9vDUl1FJaygwnMjNC4/rIyKE3/L 9xL5icO0kwL0z48v8D56T50lVnCWttmLAfs0/fD/yczZxxOwmAcDvcL6PCOKFznwmPgm AqPaQXnwypoYEjjnvt/GdGdnNhgZ1dDEgoQ/U= 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=lEiloDe4dConduj6mOwyWGwTLxlbkQVDVX2fK5RnvYM=; b=W6HBs2Ug9Arj+MdSYEcZp8uA4jZZjYakdkjRfmlgX6I7PsRzfvhadr3qVplAWpClob JfNGu/IUrcKmsQMJ2+TGPIzz/3vx0J8K6BuEWCRfGiafagN3MrA7jYWG4Ne8PVcBALKq sgbAiWte4EzlZ1BtOjj1UhMgXqKqzjzX6MuSg/GChDqwM8NwCytGZlofM4elxb3fZ+QN pxTcD3xo3isMCwVVnD1H93IhWdnin4+qHBfFakvCYMiH/RbdKH7OSPRON3M6Um3zCsiB fS8rnuRcip5iynek/mshZTFzdfpOxy0Hrvaq9qYrocOMnGxWMMEKYkoxSYJvE8cZk6YG 8jaA== X-Gm-Message-State: AIkVDXIo6pkc2eXWgYYaU76VMKofMeiT1g+4mxyA+m4RXo9l20L6B51dyY3nWDvI1jVcpljf X-Received: by 10.98.110.194 with SMTP id j185mr18577300pfc.157.1486454852856; Tue, 07 Feb 2017 00:07:32 -0800 (PST) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id l12sm8553164pfj.37.2017.02.07.00.07.32 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 07 Feb 2017 00:07:32 -0800 (PST) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com Subject: [PATCH v32 03/13] arm64: limit memory regions based on DT property, usable-memory-range Date: Tue, 7 Feb 2017 17:08:55 +0900 Message-Id: <20170207080904.5974-1-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.11.1 In-Reply-To: <20170207080601.5816-1-takahiro.akashi@linaro.org> References: <20170207080601.5816-1-takahiro.akashi@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170207_000853_803870_A9C84B1A X-CRM114-Status: GOOD ( 13.42 ) 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, geoff@infradead.org, kexec@lists.infradead.org, AKASHI Takahiro , james.morse@arm.com, 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 Crash dump kernel uses only a limited range of available memory as System RAM. On arm64 kdump, This memory range is advertised to crash dump kernel via a device-tree property under /chosen, linux,usable-memory-range = Crash dump kernel reads this property at boot time and calls memblock_cap_memory_range() to limit usable memory which are listed either in UEFI memory map table or "memory" nodes of a device tree blob. Signed-off-by: AKASHI Takahiro Reviewed-by: Geoff Levand Acked-by: Catalin Marinas Acked-by: Mark Rutland --- arch/arm64/mm/init.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 380ebe705093..3c41fd0bbce6 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -187,10 +187,45 @@ static int __init early_mem(char *p) } early_param("mem", early_mem); +static int __init early_init_dt_scan_usablemem(unsigned long node, + const char *uname, int depth, void *data) +{ + struct memblock_region *usablemem = data; + const __be32 *reg; + int len; + + if (depth != 1 || strcmp(uname, "chosen") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len); + if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells))) + return 1; + + usablemem->base = dt_mem_next_cell(dt_root_addr_cells, ®); + usablemem->size = dt_mem_next_cell(dt_root_size_cells, ®); + + return 1; +} + +static void __init fdt_enforce_memory_region(void) +{ + struct memblock_region reg = { + .size = 0, + }; + + of_scan_flat_dt(early_init_dt_scan_usablemem, ®); + + if (reg.size) + memblock_cap_memory_range(reg.base, reg.size); +} + void __init arm64_memblock_init(void) { const s64 linear_region_size = -(s64)PAGE_OFFSET; + /* Handle linux,usable-memory-range property */ + fdt_enforce_memory_region(); + /* * Ensure that the linear region takes up exactly half of the kernel * virtual address space. This way, we can distinguish a linear address