From patchwork Tue Dec 3 12:10:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 11271125 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4F180112B for ; Tue, 3 Dec 2019 12:11:00 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 2B82D20659 for ; Tue, 3 Dec 2019 12:11:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="VomnHPQu"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="YJq54cNG" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2B82D20659 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version: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:In-Reply-To:References: List-Owner; bh=d9G0fy+ThKa2PuTy4QjrVx6NzSXfWSoBZIPS1K8fRf8=; b=VomnHPQudmtvKE FwKR61UYn8J+uAAYl+JqpqPR6gmX8Ssoz24C5xYprRdrkZRtYsN79O/w7ZP7VH6cJSF7fVqdNTWut ia9f+rhKF5vY91wt+BojQy87c5aV+ZosiqTq06X0pnKjpKr2tUDnJNJI1OenkvA1gw1ScXYyT1qmu fpyyA3QCgivruJJBENXAhvkQr/zUO+HX/0zmTLCT++t6wH0OiL17Y9ArKK5zmqGdfmQrsw9a42VoQ wU0xWGFJYdPWI/1KeaEtd+8wHurkhnHxDTd6CaxLClpj5+fRhuUbAptMcq9rXoR9Q5aUJLKfI7uLS qFI7/ymqutu9FrXjpKew==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ic719-0000pr-NE; Tue, 03 Dec 2019 12:10:59 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ic716-0000pJ-A6 for linux-arm-kernel@lists.infradead.org; Tue, 03 Dec 2019 12:10:58 +0000 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3F49C20659; Tue, 3 Dec 2019 12:10:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575375056; bh=mM13KHxBngohOxFi/TTFeMlKRJJ80enDLR3A+PBKNYg=; h=From:To:Cc:Subject:Date:From; b=YJq54cNGOravzW6GKl2E/rJ1C/BJibT6H/beqkESWRLue1bUynPWXuNY7N+wW6/zH fP7avqLbUEo+Q7OMcHsTF0rM2UBgQF8zMof3ZaYih+p45LV7/+89Bz82xezXXTFoVx q4jsxxEKSoz9xBFXRYeOKrjzRBsG7dddYcExEwRk= From: Will Deacon To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] arm64: mm: Fix initialisation of DMA zones on non-NUMA systems Date: Tue, 3 Dec 2019 12:10:13 +0000 Message-Id: <20191203121013.9280-1-will@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191203_041056_391195_F8A11AF0 X-CRM114-Status: GOOD ( 15.16 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , linux-kernel@vger.kernel.org, Bjorn Andersson , John Stultz , Will Deacon , Christoph Hellwig , Nicolas Saenz Julienne Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org John reports that the recently merged commit 1a8e1cef7603 ("arm64: use both ZONE_DMA and ZONE_DMA32") breaks the boot on his DB845C board: | Booting Linux on physical CPU 0x0000000000 [0x517f803c] | Linux version 5.4.0-mainline-10675-g957a03b9e38f | Machine model: Thundercomm Dragonboard 845c | [...] | Built 1 zonelists, mobility grouping on. Total pages: -188245 | Kernel command line: earlycon | firmware_class.path=/vendor/firmware/ androidboot.hardware=db845c | init=/init androidboot.boot_devices=soc/1d84000.ufshc | printk.devkmsg=on buildvariant=userdebug root=/dev/sda2 | androidboot.bootdevice=1d84000.ufshc androidboot.serialno=c4e1189c | androidboot.baseband=sda | msm_drm.dsi_display0=dsi_lt9611_1080_video_display: | androidboot.slot_suffix=_a skip_initramfs rootwait ro init=/init | | This is because, when CONFIG_NUMA=n, zone_sizes_init() fails to handle memblocks that fall entirely within the ZONE_DMA region and erroneously ends up trying to add a negatively-sized region into the following ZONE_DMA32, which is later interpreted as a large unsigned region by the core MM code. Rework the non-NUMA implementation of zone_sizes_init() so that the start address of the memblock being processed is adjusted according to the end of the previous zone, which is then range-checked before updating the hole information of subsequent zones. Cc: Nicolas Saenz Julienne Cc: Catalin Marinas Cc: Christoph Hellwig Cc: Bjorn Andersson Link: https://lore.kernel.org/lkml/CALAqxLVVcsmFrDKLRGRq7GewcW405yTOxG=KR3csVzQ6bXutkA@mail.gmail.com Fixes: 1a8e1cef7603 ("arm64: use both ZONE_DMA and ZONE_DMA32") Reported-by: John Stultz Signed-off-by: Will Deacon Tested-by: John Stultz --- arch/arm64/mm/init.c | 25 +++++++++++-------------- 1 file changed, 11 insertions(+), 14 deletions(-) Compile-tested only. diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index be9481cdf3b9..b65dffdfb201 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -214,15 +214,14 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max) { struct memblock_region *reg; unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; - unsigned long max_dma32 = min; - unsigned long __maybe_unused max_dma = min; + unsigned long __maybe_unused max_dma, max_dma32; memset(zone_size, 0, sizeof(zone_size)); + max_dma = max_dma32 = min; #ifdef CONFIG_ZONE_DMA - max_dma = PFN_DOWN(arm64_dma_phys_limit); + max_dma = max_dma32 = PFN_DOWN(arm64_dma_phys_limit); zone_size[ZONE_DMA] = max_dma - min; - max_dma32 = max_dma; #endif #ifdef CONFIG_ZONE_DMA32 max_dma32 = PFN_DOWN(arm64_dma32_phys_limit); @@ -236,25 +235,23 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max) unsigned long start = memblock_region_memory_base_pfn(reg); unsigned long end = memblock_region_memory_end_pfn(reg); - if (start >= max) - continue; #ifdef CONFIG_ZONE_DMA - if (start < max_dma) { - unsigned long dma_end = min_not_zero(end, max_dma); + if (start >= min && start < max_dma) { + unsigned long dma_end = min(end, max_dma); zhole_size[ZONE_DMA] -= dma_end - start; + start = dma_end; } #endif #ifdef CONFIG_ZONE_DMA32 - if (start < max_dma32) { + if (start >= max_dma && start < max_dma32) { unsigned long dma32_end = min(end, max_dma32); - unsigned long dma32_start = max(start, max_dma); - zhole_size[ZONE_DMA32] -= dma32_end - dma32_start; + zhole_size[ZONE_DMA32] -= dma32_end - start; + start = dma32_end; } #endif - if (end > max_dma32) { + if (start >= max_dma32 && start < max) { unsigned long normal_end = min(end, max); - unsigned long normal_start = max(start, max_dma32); - zhole_size[ZONE_NORMAL] -= normal_end - normal_start; + zhole_size[ZONE_NORMAL] -= normal_end - start; } }