From patchwork Fri Mar 4 23:51:15 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geoff Levand X-Patchwork-Id: 63617 Delivered-To: patch@linaro.org Received: by 10.112.199.169 with SMTP id jl9csp347648lbc; Fri, 4 Mar 2016 15:59:09 -0800 (PST) X-Received: by 10.66.218.196 with SMTP id pi4mr15893620pac.147.1457135949240; Fri, 04 Mar 2016 15:59:09 -0800 (PST) Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org. [198.137.202.9]) by mx.google.com with ESMTPS id kk8si79255pab.26.2016.03.04.15.59.08 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 04 Mar 2016 15:59:09 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 198.137.202.9 as permitted sender) client-ip=198.137.202.9; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org designates 198.137.202.9 as permitted sender) smtp.mailfrom=linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1abzbd-0006G5-7r; Fri, 04 Mar 2016 23:58:01 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1abzVB-0007Jx-2H; Fri, 04 Mar 2016 23:51:21 +0000 Received: from geoff by merlin.infradead.org with local (Exim 4.85 #2 (Red Hat Linux)) id 1abzV5-0004PU-88; Fri, 04 Mar 2016 23:51:15 +0000 Message-Id: In-Reply-To: References: From: Geoff Levand Patch-Date: Tue, 26 Jan 2016 15:29:29 +0900 Subject: [PATCH v14 16/20] arm64: limit memory regions based on DT property, usable-memory To: Catalin Marinas , Will Deacon Date: Fri, 04 Mar 2016 23:51:15 +0000 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 , marc.zyngier@arm.com, kexec@lists.infradead.org, AKASHI Takahiro , James Morse , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patch=linaro.org@lists.infradead.org From: AKASHI Takahiro Crash dump kernel will be run with a limited range of memory as System RAM. On arm64, we will use a device-tree property under /chosen, linux,usable-memory = in order for primary kernel either on uefi or non-uefi (device tree only) system to hand over the information about usable memory region to crash dump kernel. This property will supercede entries in uefi memory map table and "memory" nodes in a device tree. Signed-off-by: AKASHI Takahiro --- arch/arm64/mm/init.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) -- 2.5.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index ff5e01a..f46e33b 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -215,8 +215,45 @@ 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 = (struct memblock_region *)data; + const __be32 *reg; + int len; + + usablemem->size = 0; + + if (depth != 1 || strcmp(uname, "chosen") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,usable-memory", &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; + + of_scan_flat_dt(early_init_dt_scan_usablemem, ®); + + if (reg.size) { + memblock_remove(0, PAGE_ALIGN(reg.base)); + memblock_remove(round_down(reg.base + reg.size, PAGE_SIZE), + ULLONG_MAX); + } +} + void __init arm64_memblock_init(void) { + fdt_enforce_memory_region(); + memblock_enforce_memory_limit(memory_limit); /*