From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 142F8C65BAF for ; Mon, 10 Dec 2018 01:15:52 +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 D01C62064D for ; Mon, 10 Dec 2018 01:15:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="exLI0SiL"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="F4dSAwLa" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D01C62064D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.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:References:In-Reply-To: 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: List-Owner; bh=MVGwzoSpJZaAJz4lYvoJFU2AZGmty7HesulndJaPM8Y=; b=exLI0SiLuMb4FU axHHQ+2UfN67bXLUldSrveM+Ewtr0vi5uJrleH1I17c/Xc4UuMKnwmI8FJNk3aq5QbpCqEjnyRlqQ Y6FvxXIBwbQw75604STso97zRK8bKaD/cFwWL52MknbBD+nIniBZF4rc9nirXNjePNJ+/jTN6OSzF kXK4MTaIc4Y/spcGO/2fRBZDnb3FUQV81USjwBw8DimaJZgu1QhU1ms0wzqKmSAOy3sVY0jfFpbcf 9zIAsr+dDCZt1frS7p5wnTS+zEE2LmTqeh0rHVXjCN9Bn6nQ/TFZiS6MQ0M8EujuFWbWlvNoomvoH IAij4jJd0Dc51yY9yygg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gWAAj-0005UP-ER; Mon, 10 Dec 2018 01:15:45 +0000 Received: from mail-pf1-x442.google.com ([2607:f8b0:4864:20::442]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gWAAZ-0005Gn-ES for linux-arm-kernel@lists.infradead.org; Mon, 10 Dec 2018 01:15:41 +0000 Received: by mail-pf1-x442.google.com with SMTP id h3so4552081pfg.1 for ; Sun, 09 Dec 2018 17:15:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3zyI5zxZwGodfMTrNuDET37rIHixML6NRWv3fhvncg0=; b=F4dSAwLagRa3eNfp8xVsBcj5GpG/ybNbaaAygiLhss+vwu7nAPzQ6u6tFw1OlDVwdk OGFjnIPRhzQSnsSC+yj3pYAIYoaIzKv8E3NvGpEVdV3OjzxbwUzEHIbS0NOPFgvoefvT TIA08R0lL8xmw8DW6FTHsu5otufjdV5lXsirc= 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:mime-version:content-transfer-encoding; bh=3zyI5zxZwGodfMTrNuDET37rIHixML6NRWv3fhvncg0=; b=rpGSb2E51UO7UEn+j6kwOa3juady9DYNndqtZKezXBETlZFbK4BH/kHo6grCfka4Hl ZDyIhUL4TLBzPbEKwzOxmEiE0W4j1+nUpQq35a57J+6xJt3LNd8G6II3Z+/te4XwdxUs eLVCgVJ8GSZ+vDpatjzYLZ3xMkL3boUUaAf5V/5cBPBB1jv/e364YBySi+kPE83uoWAm koXredhJxOaWA4jMMkmupllI36AoZZKhpduK6DQCFy4LhLv3Xhss9YFzTPb66StNeqRV wS+5oGmGXfM8fC+aArIoPSKDMSGvlwzX4ALqTr/d60uR9wzMDN7Qv9kTH3raZsGR2GDf QeFQ== X-Gm-Message-State: AA+aEWaS6REur7Mw1BaF3uF/FYDn1DCjXhnjjrjPAKrzfxqHazVlQfJo 2dtfsbR2G7UnpyrvmkmJOQo2YA== X-Google-Smtp-Source: AFSGD/UweY//RlIzHQzR4czsV/CUhCbYkqwlM4MbLxoZIZ/Pxxkz5U+J4ofgZQwt5fWHP6ylViFjDQ== X-Received: by 2002:a63:4187:: with SMTP id o129mr8507789pga.370.1544404528270; Sun, 09 Dec 2018 17:15:28 -0800 (PST) Received: from drinkcat2.tpe.corp.google.com ([2401:fa00:1:b:f659:7f17:ea11:4e8e]) by smtp.gmail.com with ESMTPSA id b10sm16516336pfj.183.2018.12.09.17.15.24 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 09 Dec 2018 17:15:27 -0800 (PST) From: Nicolas Boichat To: Will Deacon Subject: [PATCH v6 2/3] iommu/io-pgtable-arm-v7s: Request DMA32 memory, and improve debugging Date: Mon, 10 Dec 2018 09:15:03 +0800 Message-Id: <20181210011504.122604-3-drinkcat@chromium.org> X-Mailer: git-send-email 2.20.0.rc2.403.gdbc3b29805-goog In-Reply-To: <20181210011504.122604-1-drinkcat@chromium.org> References: <20181210011504.122604-1-drinkcat@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181209_171536_339783_BFFF3E4A X-CRM114-Status: GOOD ( 16.00 ) 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: Michal Hocko , Levin Alexander , linux-mm@kvack.org, Christoph Lameter , Huaisheng Ye , Joerg Roedel , Matthew Wilcox , hch@infradead.org, linux-arm-kernel@lists.infradead.org, David Rientjes , yingjoe.chen@mediatek.com, Vlastimil Babka , Tomasz Figa , Mike Rapoport , hsinyi@chromium.org, Matthias Brugger , Joonsoo Kim , Yong Wu , Robin Murphy , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Pekka Enberg , iommu@lists.linux-foundation.org, Andrew Morton , Mel Gorman Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 level 1/2 pages, ensure GFP_DMA32 is used if CONFIG_ZONE_DMA32 is defined (e.g. on arm64 platforms). For level 2 pages, allocate a slab cache in SLAB_CACHE_DMA32. Note that we do not explicitly pass GFP_DMA[32] to kmem_cache_zalloc, as this is not strictly necessary, and would cause a warning in mm/sl*b.c, as we did not update GFP_SLAB_BUG_MASK. Also, print an error when the physical address does not fit in 32-bit, to make debugging easier in the future. Cc: stable@vger.kernel.org Fixes: ad67f5a6545f ("arm64: replace ZONE_DMA with ZONE_DMA32") Signed-off-by: Nicolas Boichat --- Changes since v2: - Commit message (v3 used the page_frag approach) Changes since v4: - Do not pass ARM_V7S_TABLE_GFP_DMA to kmem_cache_zalloc, as this is unnecessary, and would trigger a warning. Changes since v5: - Rename ARM_V7S_TABLE_SLAB_CACHE to ARM_V7S_TABLE_SLAB_FLAGS. drivers/iommu/io-pgtable-arm-v7s.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c index 445c3bde04800c..d2fdb192f7610f 100644 --- a/drivers/iommu/io-pgtable-arm-v7s.c +++ b/drivers/iommu/io-pgtable-arm-v7s.c @@ -161,6 +161,14 @@ #define ARM_V7S_TCR_PD1 BIT(5) +#ifdef CONFIG_ZONE_DMA32 +#define ARM_V7S_TABLE_GFP_DMA GFP_DMA32 +#define ARM_V7S_TABLE_SLAB_FLAGS SLAB_CACHE_DMA32 +#else +#define ARM_V7S_TABLE_GFP_DMA GFP_DMA +#define ARM_V7S_TABLE_SLAB_FLAGS SLAB_CACHE_DMA +#endif + typedef u32 arm_v7s_iopte; static bool selftest_running; @@ -198,13 +206,16 @@ static void *__arm_v7s_alloc_table(int lvl, gfp_t gfp, void *table = NULL; if (lvl == 1) - table = (void *)__get_dma_pages(__GFP_ZERO, get_order(size)); + table = (void *)__get_free_pages( + __GFP_ZERO | ARM_V7S_TABLE_GFP_DMA, get_order(size)); else if (lvl == 2) - table = kmem_cache_zalloc(data->l2_tables, gfp | GFP_DMA); + table = kmem_cache_zalloc(data->l2_tables, gfp); phys = virt_to_phys(table); - if (phys != (arm_v7s_iopte)phys) + if (phys != (arm_v7s_iopte)phys) { /* Doesn't fit in PTE */ + dev_err(dev, "Page table does not fit in PTE: %pa", &phys); goto out_free; + } if (table && !(cfg->quirks & IO_PGTABLE_QUIRK_NO_DMA)) { dma = dma_map_single(dev, table, size, DMA_TO_DEVICE); if (dma_mapping_error(dev, dma)) @@ -737,7 +748,7 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg, data->l2_tables = kmem_cache_create("io-pgtable_armv7s_l2", ARM_V7S_TABLE_SIZE(2), ARM_V7S_TABLE_SIZE(2), - SLAB_CACHE_DMA, NULL); + ARM_V7S_TABLE_SLAB_FLAGS, NULL); if (!data->l2_tables) goto out_free_data; -- 2.20.0.rc2.403.gdbc3b29805-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel