From nobody Sun Oct 5 14:37:48 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1754311418; cv=none; d=zohomail.com; s=zohoarc; b=eaxW27vwUT4kh121XprDSdavohLwPECGYszmZi1SZY+EiLegekhLyX8PtxyzU2NcSjUv3BM30xGx71X/HMlF26s0x8daAH0PEN8r+6Gwyfv2Ee1S20TSLhM4ghChQ5YoSixfcLVB0qxUHlRhKvuUfHLyj3MkFky/Oh+meyufLak= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1754311418; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=4AS9Yc3IoSR3Vqk1MHpbcTKCwde8JIMHurGCZB+n6Y8=; b=dKBvd4FE3xS/lWiDDkM6GKsvzGD5CkNkj/y21Lp6fB62TpJfl40/OMOAIDEZqLWW0cy3MsmXriOW9/p1O+0d7aiAQZHasapNC2IPPgcysx4koWbz9Sv+Xjrx8hzWtZkdG2+SOhnudNXb/pNNC1iFJEvNThBU3msScTsNnHedTEc= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1754311418562461.8656237421869; Mon, 4 Aug 2025 05:43:38 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.1069163.1432995 (Exim 4.92) (envelope-from ) id 1uiuXD-0006iu-CN; Mon, 04 Aug 2025 12:43:23 +0000 Received: by outflank-mailman (output) from mailman id 1069163.1432995; Mon, 04 Aug 2025 12:43:23 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uiuXD-0006in-9h; Mon, 04 Aug 2025 12:43:23 +0000 Received: by outflank-mailman (input) for mailman id 1069163; Mon, 04 Aug 2025 12:43:21 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1uiuXB-0006VD-NW for xen-devel@lists.xenproject.org; Mon, 04 Aug 2025 12:43:21 +0000 Received: from sea.source.kernel.org (sea.source.kernel.org [2600:3c0a:e001:78e:0:1991:8:25]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 99425443-7130-11f0-a321-13f23c93f187; Mon, 04 Aug 2025 14:43:20 +0200 (CEST) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 56FE04423C; Mon, 4 Aug 2025 12:43:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B783C4CEF0; Mon, 4 Aug 2025 12:43:17 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 99425443-7130-11f0-a321-13f23c93f187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754311398; bh=rlkoLHmieI8GnOBig0uhL3NMd0vvRWDvv2oEih0mzFM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QrFIfUaOpq0zgYoSf2B1eOFHhzxa8uJ9rI7ao3LQ15JdOAmXwx/vS3c+eYH6QTWOC CZmPIb28BNkyQUhEkXmvY3ou31ivX2Y6W+QyRQ5lEcadqA118EYMjd4CMO32TmndIt q9x/mE/Grc0mkPr/feAp0D8366SSjD6FCJuMLM/iEpxRFuKKQJHqb6OZAv8QT4n2gA l8UYQWJxtJiMLDORYH+k0vFOc3W5LIKBdC/UjGKILIXxW7YyF57t2tVDzjmI4Hs2SY Y6Y7brOxqet5SSMB18NQiaM/FfQfmONk81U59gW5ymq8VCTWf5/3zTUjdvPe68z/B6 YFqU3TERLKLDQ== From: Leon Romanovsky To: Marek Szyprowski Cc: Leon Romanovsky , Jason Gunthorpe , Abdiel Janulgue , Alexander Potapenko , Alex Gaynor , Andrew Morton , Christoph Hellwig , Danilo Krummrich , iommu@lists.linux.dev, Jason Wang , Jens Axboe , Joerg Roedel , Jonathan Corbet , Juergen Gross , kasan-dev@googlegroups.com, Keith Busch , linux-block@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-nvme@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-trace-kernel@vger.kernel.org, Madhavan Srinivasan , Masami Hiramatsu , Michael Ellerman , "Michael S. Tsirkin" , Miguel Ojeda , Robin Murphy , rust-for-linux@vger.kernel.org, Sagi Grimberg , Stefano Stabellini , Steven Rostedt , virtualization@lists.linux.dev, Will Deacon , xen-devel@lists.xenproject.org Subject: [PATCH v1 02/16] iommu/dma: handle MMIO path in dma_iova_link Date: Mon, 4 Aug 2025 15:42:36 +0300 Message-ID: <52e39cd31d8f30e54a27afac84ea35f45ae4e422.1754292567.git.leon@kernel.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1754311428633124100 Content-Type: text/plain; charset="utf-8" From: Leon Romanovsky Make sure that CPU is not synced if MMIO path is taken. Signed-off-by: Leon Romanovsky Reviewed-by: Jason Gunthorpe --- drivers/iommu/dma-iommu.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index ea2ef53bd4fef..399838c17b705 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1837,13 +1837,20 @@ static int __dma_iova_link(struct device *dev, dma_= addr_t addr, phys_addr_t phys, size_t size, enum dma_data_direction dir, unsigned long attrs) { - bool coherent =3D dev_is_dma_coherent(dev); + int prot; =20 - if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - arch_sync_dma_for_device(phys, size, dir); + if (attrs & DMA_ATTR_MMIO) + prot =3D dma_info_to_prot(dir, false, attrs) | IOMMU_MMIO; + else { + bool coherent =3D dev_is_dma_coherent(dev); + + if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + arch_sync_dma_for_device(phys, size, dir); + prot =3D dma_info_to_prot(dir, coherent, attrs); + } =20 return iommu_map_nosync(iommu_get_dma_domain(dev), addr, phys, size, - dma_info_to_prot(dir, coherent, attrs), GFP_ATOMIC); + prot, GFP_ATOMIC); } =20 static int iommu_dma_iova_bounce_and_link(struct device *dev, dma_addr_t a= ddr, @@ -1949,9 +1956,13 @@ int dma_iova_link(struct device *dev, struct dma_iov= a_state *state, return -EIO; =20 if (dev_use_swiotlb(dev, size, dir) && - iova_unaligned(iovad, phys, size)) + iova_unaligned(iovad, phys, size)) { + if (attrs & DMA_ATTR_MMIO) + return -EPERM; + return iommu_dma_iova_link_swiotlb(dev, state, phys, offset, size, dir, attrs); + } =20 return __dma_iova_link(dev, state->addr + offset - iova_start_pad, phys - iova_start_pad, --=20 2.50.1