From patchwork Fri Sep 16 09:41:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janne Grunau X-Patchwork-Id: 12978341 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id AC149ECAAD8 for ; Fri, 16 Sep 2022 09:43:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=NvuRDB6DIimudYXFlrpRKbiXHfmPeD4gnywH8qAk1M4=; b=jJ5+TvCLLfTaZC A+JPvikTl5V1VbT6tmP767SJWAl/pkQCEdkQ4EL8UBoRoM6jUBXWfCxWJhCVCdZw3eaRj+VMVOdq3 /DEfacMR8ZWDiTSlULmzbsapn9hJyL0zX2mjG8JbAaVOEFD7J+Rql/xU6F77VsFvlCKV5KCqggoZR EiBRPuOu6J9RhViKCF6rJHCXinkR6xy7jjexwsr0tnXNOiiV6qwRprQUAWwp1Q6znHHX4BD6gJsi9 mX903mkihUZZtcrY1vKORPdTgiENCudoeHW4i82MvMUu2Sb/MfjUEkabfB3AWLcJnEtAM4y+TXF7E AdiRheuaVWDrolQK1ZYw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oZ7rl-00Bn8W-CS; Fri, 16 Sep 2022 09:42:33 +0000 Received: from soltyk.jannau.net ([144.76.91.90]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oZ7rE-00BmqR-P6 for linux-arm-kernel@lists.infradead.org; Fri, 16 Sep 2022 09:42:03 +0000 Received: from robin.home.jannau.net (unknown [91.200.110.112]) by soltyk.jannau.net (Postfix) with ESMTPSA id 487A326F075; Fri, 16 Sep 2022 11:41:55 +0200 (CEST) From: Janne Grunau To: iommu@lists.linux.dev Cc: Konrad Dybcio , asahi@lists.linux.dev, Sven Peter , Alyssa Rosenzweig , Hector Martin , Joerg Roedel , Will Deacon , iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 3/5] iommu/io-pgtable: Add DART subpage protection support Date: Fri, 16 Sep 2022 11:41:50 +0200 Message-Id: <20220916094152.87137-4-j@jannau.net> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220916094152.87137-1-j@jannau.net> References: <20220916094152.87137-1-j@jannau.net> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220916_024201_042520_3BFCBAA0 X-CRM114-Status: GOOD ( 10.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 Signed-off-by: Janne Grunau Reviewed-by: Rob Herring --- (no changes since v3) Changes in v3: - apply change to io-pgtable-dart.c drivers/iommu/io-pgtable-dart.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/iommu/io-pgtable-dart.c b/drivers/iommu/io-pgtable-dart.c index 312d40528748..665a52e5c9b0 100644 --- a/drivers/iommu/io-pgtable-dart.c +++ b/drivers/iommu/io-pgtable-dart.c @@ -14,6 +14,7 @@ #define pr_fmt(fmt) "dart io-pgtable: " fmt #include +#include #include #include #include @@ -40,6 +41,9 @@ #define DART_PTES_PER_TABLE(d) \ (DART_GRANULE(d) >> ilog2(sizeof(dart_iopte))) +#define APPLE_DART_PTE_SUBPAGE_START GENMASK_ULL(63, 52) +#define APPLE_DART_PTE_SUBPAGE_END GENMASK_ULL(51, 40) + #define APPLE_DART1_PADDR_MASK GENMASK_ULL(35, 12) /* Apple DART1 protection bits */ @@ -108,6 +112,10 @@ static int dart_init_pte(struct dart_io_pgtable *data, return -EEXIST; } + /* 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); + pte |= APPLE_DART1_PTE_PROT_SP_DIS; pte |= APPLE_DART_PTE_VALID;