From nobody Sat Nov 30 03:29:30 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C8D061A2631; Thu, 12 Sep 2024 11:16:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726139793; cv=none; b=nmtN2JvktCGUa86vLJO7rFwHMwWGK6SqvKqvpC5mdFGPFLaKknPW7iyXpqJYMR+UaBk+qYDIQ8ZLIY0yO57EAXOtDkAwcYBBsY45l3G9lOXsBpK4R9ibcPV3xa+iisle/FX8fhVP7vFLq1GuSeoBoBnYenNmH1ZG2vnYFXOX83Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726139793; c=relaxed/simple; bh=UdWHtN/ksXEH4oEZ6oLMvfaCKk3WWuTK2xFlFpaVROQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=EeL2nWOIykG5W1P0+7ZXRkr5hDnwS55lXMwem74B97XfezOyKn88jzZgfJ+c+qZ7tVv0HGfX+UE9gm4SOG9Tw1Pf6jaXmaCx/WwKzVqZtF6QwLwlQZcuq3Z7KtiG6+/R1s0j7KRFVc0fGnEupSFzOPN6HpliQspvL7oa6w6/OPY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JaEIJPQl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JaEIJPQl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8814DC4CECC; Thu, 12 Sep 2024 11:16:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726139793; bh=UdWHtN/ksXEH4oEZ6oLMvfaCKk3WWuTK2xFlFpaVROQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JaEIJPQlXW2dDMP6p7hqTalr5/nZfzPDNjt31Ao+a/Z+6Qd6aR11344w2a+DiulS6 iMiK8gTB/L8nSXItJGUYe9cwRmL2GgnozYUV8QmwIPwxlHyW9aemlOw4kUFJ274pAA PN0d31Risc4/iSKKWebUhSD66kfvH9LIyEwYMS4hOAKbYQxJRBmddM3wevSD+t9Lab 3P9ksYF1WRRS9QQhDgWjrPfCaOyxagFMoWzGFxcyzomruL7xcQnhG0yOGfbzjF3fR/ bCmDiQ+O2/NGR32Y9Ac9Uqzw207ZTfmgI/uaIsUSGZlxOlUgCp8lIc5BJSywScgOIC JJAYki7oZADlw== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , Christoph Hellwig , "Zeng, Oak" , Chaitanya Kulkarni Cc: Leon Romanovsky , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Andrew Morton , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: [RFC v2 03/21] iommu/dma: Add check if IOVA can be used Date: Thu, 12 Sep 2024 14:15:38 +0300 Message-ID: X-Mailer: git-send-email 2.46.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Leon Romanovsky This patch adds a check if IOVA can be used for the page and size. Signed-off-by: Leon Romanovsky --- drivers/iommu/dma-iommu.c | 21 +++++++++++++++++++++ drivers/pci/p2pdma.c | 4 ++-- include/linux/dma-map-ops.h | 7 +++++++ include/linux/iommu-dma.h | 7 +++++++ 4 files changed, 37 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 72763f76b712..3e2e382bb502 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -1829,6 +1830,26 @@ void iommu_dma_unlink_range(struct device *dev, dma_= addr_t start, size_t size, iommu_iotlb_sync(domain, &iotlb_gather); } =20 +bool iommu_can_use_iova(struct device *dev, struct page *page, size_t size, + enum dma_data_direction dir) +{ + enum pci_p2pdma_map_type map; + + if (is_swiotlb_force_bounce(dev) || dev_use_swiotlb(dev, size, dir)) + return false; + + /* TODO: Rewrite this check to rely on specific struct page flags */ + if (cc_platform_has(CC_ATTR_MEM_ENCRYPT)) + return false; + + if (page && is_pci_p2pdma_page(page)) { + map =3D pci_p2pdma_map_type(page->pgmap, dev); + return map =3D=3D PCI_P2PDMA_MAP_THRU_HOST_BRIDGE; + } + + return true; +} + void iommu_setup_dma_ops(struct device *dev) { struct iommu_domain *domain =3D iommu_get_domain_for_dev(dev); diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 4f47a13cb500..6ceea32bb041 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -964,8 +964,8 @@ void pci_p2pmem_publish(struct pci_dev *pdev, bool publ= ish) } EXPORT_SYMBOL_GPL(pci_p2pmem_publish); =20 -static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pg= map, - struct device *dev) +enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, + struct device *dev) { enum pci_p2pdma_map_type type =3D PCI_P2PDMA_MAP_NOT_SUPPORTED; struct pci_dev *provider =3D to_p2p_pgmap(pgmap)->provider; diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 103d9c66c445..936e822e9f40 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -516,6 +516,8 @@ struct pci_p2pdma_map_state { enum pci_p2pdma_map_type pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *= dev, struct scatterlist *sg); +enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, + struct device *dev); #else /* CONFIG_PCI_P2PDMA */ static inline enum pci_p2pdma_map_type pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *= dev, @@ -523,6 +525,11 @@ pci_p2pdma_map_segment(struct pci_p2pdma_map_state *st= ate, struct device *dev, { return PCI_P2PDMA_MAP_NOT_SUPPORTED; } +static inline enum pci_p2pdma_map_type +pci_p2pdma_map_type(struct dev_pagemap *pgmap, struct device *dev) +{ + return PCI_P2PDMA_MAP_NOT_SUPPORTED; +} #endif /* CONFIG_PCI_P2PDMA */ =20 #endif /* _LINUX_DMA_MAP_OPS_H */ diff --git a/include/linux/iommu-dma.h b/include/linux/iommu-dma.h index 21b0341f52b8..561d81b12d9c 100644 --- a/include/linux/iommu-dma.h +++ b/include/linux/iommu-dma.h @@ -66,6 +66,8 @@ dma_addr_t iommu_dma_link_range(struct dma_iova_state *st= ate, phys_addr_t phys, size_t size, unsigned long attrs); void iommu_dma_unlink_range(struct device *dev, dma_addr_t start, size_t s= ize, enum dma_data_direction dir, unsigned long attrs); +bool iommu_can_use_iova(struct device *dev, struct page *page, size_t size, + enum dma_data_direction dir); #else static inline bool use_dma_iommu(struct device *dev) { @@ -209,5 +211,10 @@ static inline void iommu_dma_unlink_range(struct devic= e *dev, dma_addr_t start, unsigned long attrs) { } +static inline bool iommu_can_use_iova(struct device *dev, struct page *pag= e, + size_t size, enum dma_data_direction dir) +{ + return false; +} #endif /* CONFIG_IOMMU_DMA */ #endif /* _LINUX_IOMMU_DMA_H */ --=20 2.46.0