From nobody Mon Nov 25 15:47:49 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 E1E9417C7CE; Sun, 27 Oct 2024 14:21:43 +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=1730038904; cv=none; b=vC0ZBs9AdFb1rz1lADex/lYcxRLPx5at+qZzEIC5Z3BtpIuXA4/H7bFE2EE4NZocHbptKwV+um9HN8aGqTEg+2D7J6g7GhOWHq4lNUYQegUVUya1d90+kV3g+3dil2kr6kyRnzCaSIvV04EsVUJepqWaQ4IgjmQeAoepJCyRHQM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730038904; c=relaxed/simple; bh=Lk+QUmdhMcbaHNbOGFaFlupW/NnaXwQbfPX5iL2RGqE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kZyTHrU7wRgOmzr65+WLmtHqLwxrUn7NRu5h0oNmOGNk5jFmpXkJy62QAvgLaEDSJeQ39uEd9VrvQTkpMpyzr3snwlbIWZwnAwpZBhbal2wjxJOWWbk3KNPyRYQN6DAB8UNhYRu6g1/ICS38Wi+FqIyuJicQNjLbCIpqwe2jONM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZoVzrJRd; 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="ZoVzrJRd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9AA2C4CEC3; Sun, 27 Oct 2024 14:21:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730038903; bh=Lk+QUmdhMcbaHNbOGFaFlupW/NnaXwQbfPX5iL2RGqE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZoVzrJRdd8rbuT6L+Xi5EMaR91AubipgWfrJzgY4JanYIOix9GILLMyRG2Xftdq+D lvrjY2oCt9XfFuqUh3vIevkzrvt0atPYbUaWw6Pm4Ef6wiC0RsEWSs63z9vUuUJP2Z Exza5dLmVV1JWpGz7EmA7eXKpzaBn72zgcq/WewExhzpFWYJjBWcm6nQgFMuMchQbV bmSbUpVoeD9Br3okWLfdemzPmx6pAYzml6afn/7ySUeHq5DwWPvSPtv3xBRXzwj+Zo kAWWFq5krUcNCImhCceSB8D3j9OASgP8EKBeMBugYciQuO3BvEw7YndlF7mwhOLJTk 4S9LNT9t1ys+g== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Christoph Hellwig , Sagi Grimberg Cc: Leon Romanovsky , Keith Busch , 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 , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@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: [PATCH 04/18] dma-mapping: Add check if IOVA can be used Date: Sun, 27 Oct 2024 16:21:04 +0200 Message-ID: <6225a5bcc7fc584abfc6d0ed0473b7b2a24a2df2.1730037276.git.leon@kernel.org> X-Mailer: git-send-email 2.46.2 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 specific transaction. In the new API a DMA mapping transaction is identified by a struct dma_iova_state, which holds some recomputed information for the transaction which does not change for each page being mapped. Signed-off-by: Leon Romanovsky --- include/linux/dma-mapping.h | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 1524da363734..6075e0708deb 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -76,6 +76,20 @@ =20 #define DMA_BIT_MASK(n) (((n) =3D=3D 64) ? ~0ULL : ((1ULL<<(n))-1)) =20 +struct dma_iova_state { + size_t __size; +}; + +/* + * Use the high bit to mark if we used swiotlb for one or more ranges. + */ +#define DMA_IOVA_USE_SWIOTLB (1ULL << 63) + +static inline size_t dma_iova_size(struct dma_iova_state *state) +{ + return state->__size & ~DMA_IOVA_USE_SWIOTLB; +} + #ifdef CONFIG_DMA_API_DEBUG void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); void debug_dma_map_single(struct device *dev, const void *addr, @@ -281,6 +295,25 @@ static inline int dma_mmap_noncontiguous(struct device= *dev, } #endif /* CONFIG_HAS_DMA */ =20 +#ifdef CONFIG_IOMMU_DMA +/** + * dma_use_iova - check if the IOVA API is used for this state + * @state: IOVA state + * + * Return %true if the DMA transfers uses the dma_iova_*() calls or %false= if + * they can't be used. + */ +static inline bool dma_use_iova(struct dma_iova_state *state) +{ + return state->__size !=3D 0; +} +#else /* CONFIG_IOMMU_DMA */ +static inline bool dma_use_iova(struct dma_iova_state *state) +{ + return false; +} +#endif /* CONFIG_IOMMU_DMA */ + #if defined(CONFIG_HAS_DMA) && defined(CONFIG_DMA_NEED_SYNC) void __dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t= size, enum dma_data_direction dir); --=20 2.46.2