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 Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 51A6CC4167B for ; Tue, 3 May 2022 06:30:43 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 560BC81DAB; Tue, 3 May 2022 06:30:42 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A3NLXRIELFmm; Tue, 3 May 2022 06:30:41 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp1.osuosl.org (Postfix) with ESMTPS id 4637D82C61; Tue, 3 May 2022 06:30:41 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 32388C008A; Tue, 3 May 2022 06:30:40 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136]) by lists.linuxfoundation.org (Postfix) with ESMTP id E4BEFC002D for ; Tue, 3 May 2022 06:30:38 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id BFEE660FCC for ; Tue, 3 May 2022 06:30:38 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id D70Zvem2jSrm for ; Tue, 3 May 2022 06:30:35 +0000 (UTC) X-Greylist: delayed 00:07:30 by SQLgrey-1.8.0 Received: from soltyk.jannau.net (soltyk.jannau.net [144.76.91.90]) by smtp3.osuosl.org (Postfix) with ESMTPS id 92CAF60C1A for ; Tue, 3 May 2022 06:30:35 +0000 (UTC) Received: from coburn.home.jannau.net (p579ad988.dip0.t-ipconnect.de [87.154.217.136]) by soltyk.jannau.net (Postfix) with ESMTPSA id E76EF26E9B4; Tue, 3 May 2022 08:23:02 +0200 (CEST) From: Janne Grunau To: iommu@lists.linux-foundation.org Subject: [PATCH v2 2/4] iommu/io-pgtable: Add DART subpage protection support Date: Tue, 3 May 2022 08:22:59 +0200 Message-Id: <20220503062301.20872-3-j@jannau.net> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220503062301.20872-1-j@jannau.net> References: <20220503062301.20872-1-j@jannau.net> MIME-Version: 1.0 Cc: devicetree@vger.kernel.org, Robin Murphy , Hector Martin , linux-kernel@vger.kernel.org, Rob Herring , linux-arm-kernel@lists.infradead.org, Will Deacon , Alyssa Rosenzweig , Mark Kettenis X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" From: Sven Peter DART allows to only expose a subpage to the device. While this is an optional feature on the M1 DARTs the new ones present on the Pro/Max models require this field in every PTE. Signed-off-by: Sven Peter --- drivers/iommu/io-pgtable-arm.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c index 94ff319ae8ac..71570bbc9096 100644 --- a/drivers/iommu/io-pgtable-arm.c +++ b/drivers/iommu/io-pgtable-arm.c @@ -10,6 +10,7 @@ #define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt #include +#include #include #include #include @@ -133,6 +134,9 @@ #define APPLE_DART_PTE_PROT_NO_WRITE (1<<7) #define APPLE_DART_PTE_PROT_NO_READ (1<<8) +#define APPLE_DART_PTE_SUBPAGE_START GENMASK_ULL(63, 52) +#define APPLE_DART_PTE_SUBPAGE_END GENMASK_ULL(51, 40) + /* IOPTE accessors */ #define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d)) @@ -273,6 +277,12 @@ static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data, else pte |= ARM_LPAE_PTE_TYPE_BLOCK; + if (data->iop.fmt == APPLE_DART) { + /* subpage protection: always allow access to the entire page */ + pte |= FIELD_PREP(APPLE_DART_PTE_SUBPAGE_START, 0); + pte |= FIELD_PREP(APPLE_DART_PTE_SUBPAGE_END, 0xfff); + } + for (i = 0; i < num_entries; i++) ptep[i] = pte | paddr_to_iopte(paddr + i * sz, data); -- 2.35.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu