From patchwork Wed Dec 5 05:48:25 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Boichat X-Patchwork-Id: 10713011 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 872AD1731 for ; Wed, 5 Dec 2018 05:48:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 718A42C884 for ; Wed, 5 Dec 2018 05:48:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 61C312C8A9; Wed, 5 Dec 2018 05:48:49 +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=-3.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E60632C884 for ; Wed, 5 Dec 2018 05:48:48 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3023E6B72C5; Wed, 5 Dec 2018 00:48:48 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 2B0656B72C6; Wed, 5 Dec 2018 00:48:48 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 177B86B72C7; Wed, 5 Dec 2018 00:48:48 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-pf1-f200.google.com (mail-pf1-f200.google.com [209.85.210.200]) by kanga.kvack.org (Postfix) with ESMTP id CA5A06B72C5 for ; Wed, 5 Dec 2018 00:48:47 -0500 (EST) Received: by mail-pf1-f200.google.com with SMTP id t72so15922024pfi.21 for ; Tue, 04 Dec 2018 21:48:47 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:dkim-signature:from:to:cc:subject:date :message-id:mime-version:content-transfer-encoding; bh=jlAgOUx+d9y4Koxz93q6parhhjhH4dXwDaeTxxP4nP8=; b=IHYRwt1AVQJBfBnWockzJmEdvm7+4jQDYFseyg+j56EYcERhPReklbZ1Djs4aU+76K 8sorHLUOlaSMpOO8ekhmRVXfLNIuU02Z4VDZDdsrT0IER+SnkMYBk0MsAhDZgCEHzfRh ui2yfuuEtzRAFyJuLGVBcvK2vail+bUTP3+89bewyp/f9shECM4pgXXh68UGsfmvPFDX 9zte0wAnxzc+rltxWRxv31z/aTE8M+aBNsVUMxoqreus04ez7GFXD3Z89U8zzLR2PTn8 gC7tunquzqgjBAjMjKvGFlkzVveGdyyCwzFC530sU+V+OmyocAyVZl8YDQJodmgDpfMB zs8Q== X-Gm-Message-State: AA+aEWZK7O6L13zQYEYWrdxgidO8m+bwUnjkacwTRFOycshpOJZllV+0 ZtrnQvUPEz6FGmRyMLjM/PoEjfIYaIkUNzNWPrQzes96xredHkLsbA3DMjCgbIyqnAkC7Gglq5z qcApDzb4hLRF+3Oqg6g6WCyiZl3tcvC7H3QdAQ6M4QPs7KWA6x75rTFcJH6Rey4BSGVZfh2Xr/m ekLObPvh8Jw5JkoY4tsrcxRGzU5Ms5s5GyKhxYwgZl7eXvBfwIDPj+E9WeXgofQqpM9C4oPtkeb JoYg5iKNBpelhHJoN/mD9+xzaq3NGL03Mm+V89d2jCzGmicAWZgJUnILj9SqhlKgn0wLCdhQk5p 63kh2hE1CcCj76Zvxrj5lpjm/wmbo1+5OAsgoGWGTf2cZmgZfF9cCXZ2z2MDuzqibAVy5zxckJi J X-Received: by 2002:a62:7504:: with SMTP id q4mr22666450pfc.180.1543988927429; Tue, 04 Dec 2018 21:48:47 -0800 (PST) X-Received: by 2002:a62:7504:: with SMTP id q4mr22666425pfc.180.1543988926621; Tue, 04 Dec 2018 21:48:46 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1543988926; cv=none; d=google.com; s=arc-20160816; b=BlHJD5zK5Zj1fNG4Sf3u7jy7dJqv1ea6XfnUiG3Qk4FoldLcWbLbyTCUYCmegHOnfA ac+JGdZ2eeW+VE2vrKPGKqKIFqDZhEdG/QHScD7HilsDSsf0oiVj63xcoZzT5Hmys6bq 5AWf2RCCEJyhb5faiEXnG/xv8IBgG6czBPswwFyPSbuvDyv9fKihmGgIw5eoI1Y+HVL0 XnN8LJXHxjfRcNs6aDylbbtB2621Tzj3Qgk9JQMAqytJ7Cn8R0QjDgKssWx2Q0tSd4RN 38hVo2TeTshuExSgpxqizxOIYgmKN27eqwAQxpjcrH2K8uFl+pbmCLJOuXSou3WeA8bX w61Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:dkim-signature; bh=jlAgOUx+d9y4Koxz93q6parhhjhH4dXwDaeTxxP4nP8=; b=ymQH7+viphX0sdofoJIUi7OrhwjIrPdc11dEcywlXazza5tD/kPmYvJjC6ebYeTyLW d/e5uZx4JvABzwUXQTFuVda8AM7jFEdKevIvm4BLfLz39UHGjdm7vvsYAkELLRZbgW8k bPFcsRAV83eXSCSBSNIoC6NJ32LErld/cDfRiDkTx7ou1v4zKWfgz02BSVcJPTJEbtSu WTiIzBZcm7PwPQICeFzN79B3s1MsuYQbq1/8YBzcqgF3HEwQSkbThSXF2fusJfftbsXT B5DbjAEAjev5ShIOKPlKQ0eao8yGNuxH+13M8sFUTU6s2G2O4brWOEjBziUCpguPhp6k /wJA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=JLarozb1; spf=pass (google.com: domain of drinkcat@chromium.org designates 209.85.220.65 as permitted sender) smtp.mailfrom=drinkcat@chromium.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id 5sor15611960plx.26.2018.12.04.21.48.46 for (Google Transport Security); Tue, 04 Dec 2018 21:48:46 -0800 (PST) Received-SPF: pass (google.com: domain of drinkcat@chromium.org designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=JLarozb1; spf=pass (google.com: domain of drinkcat@chromium.org designates 209.85.220.65 as permitted sender) smtp.mailfrom=drinkcat@chromium.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=jlAgOUx+d9y4Koxz93q6parhhjhH4dXwDaeTxxP4nP8=; b=JLarozb1MoFj2iMfg32xnjapXOlEmjo9r3TV0J+hBfRbOOmqKETxBnc00LeEsw+vm0 0lGXJEwWat/3MZeQfKcHirJYh9v82fkKBNOqII0K95iE5kfWgDpEV8M/zzzbjq3VhxYF 04YxrC5+/zPLkcH+nofCQ656iGKoites41d8A= X-Google-Smtp-Source: AFSGD/XGIJEFyfrfyg8OULqJMVs+IAQFRiR6jXi3pWWWNF4H9mhmgzh0A9r92Lrx+0cfo5I3yXVu/g== X-Received: by 2002:a17:902:ac1:: with SMTP id 59mr3053408plp.36.1543988926074; Tue, 04 Dec 2018 21:48:46 -0800 (PST) Received: from drinkcat2.tpe.corp.google.com ([2401:fa00:1:b:f659:7f17:ea11:4e8e]) by smtp.gmail.com with ESMTPSA id 4sm30806513pfq.10.2018.12.04.21.48.42 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 04 Dec 2018 21:48:45 -0800 (PST) From: Nicolas Boichat To: Will Deacon Cc: Robin Murphy , Joerg Roedel , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Vlastimil Babka , Michal Hocko , Mel Gorman , Levin Alexander , Huaisheng Ye , Mike Rapoport , linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Yong Wu , Matthias Brugger , Tomasz Figa , yingjoe.chen@mediatek.com, hch@infradead.org, Matthew Wilcox Subject: [PATCH v4 0/3] iommu/io-pgtable-arm-v7s: Use DMA32 zone for page tables Date: Wed, 5 Dec 2018 13:48:25 +0800 Message-Id: <20181205054828.183476-1-drinkcat@chromium.org> X-Mailer: git-send-email 2.20.0.rc1.387.gf8505762e3-goog MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP This is a follow-up to the discussion in [1], [2]. IOMMUs using ARMv7 short-descriptor format require page tables (level 1 and 2) to be allocated within the first 4GB of RAM, even on 64-bit systems. For L1 tables that are bigger than a page, we can just use __get_free_pages with GFP_DMA32 (on arm64 systems only, arm would still use GFP_DMA). For L2 tables that only take 1KB, it would be a waste to allocate a full page, so we considered 3 approaches: 1. This series, adding support for GFP_DMA32 slab caches. 2. genalloc, which requires pre-allocating the maximum number of L2 page tables (4096, so 4MB of memory). 3. page_frag, which is not very memory-efficient as it is unable to reuse freed fragments until the whole page is freed. [3] This series is the most memory-efficient approach. [1] https://lists.linuxfoundation.org/pipermail/iommu/2018-November/030876.html [2] https://lists.linuxfoundation.org/pipermail/iommu/2018-December/031696.html [3] https://patchwork.codeaurora.org/patch/671639/ Changes since v1: - Add support for SLAB_CACHE_DMA32 in slab and slub (patches 1/2) - iommu/io-pgtable-arm-v7s (patch 3): - Changed approach to use SLAB_CACHE_DMA32 added by the previous commit. - Use DMA or DMA32 depending on the architecture (DMA for arm, DMA32 for arm64). Changes since v2: - Reworded and expanded commit messages - Added cache_dma32 documentation in PATCH 2/3. v3 used the page_frag approach, see [3]. Nicolas Boichat (3): mm: slab/slub: Add check_slab_flags function to check for valid flags mm: Add support for kmem caches in DMA32 zone iommu/io-pgtable-arm-v7s: Request DMA32 memory, and improve debugging Documentation/ABI/testing/sysfs-kernel-slab | 9 ++++++++ drivers/iommu/io-pgtable-arm-v7s.c | 20 +++++++++++++---- include/linux/slab.h | 2 ++ mm/internal.h | 22 +++++++++++++++++-- mm/slab.c | 10 +++------ mm/slab.h | 3 ++- mm/slab_common.c | 2 +- mm/slub.c | 24 +++++++++++++++------ 8 files changed, 70 insertions(+), 22 deletions(-)