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 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 2D52BD13563 for ; Sun, 27 Oct 2024 14:21:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=3MQIVTpPUFkgHQ2kL+3oRPWGhhug+8ZedKPylFoOF7U=; b=IOIj5gJhg2J6YjFbtroS0yFFbD mL0oxp9JC2f1WNQL0OKVy3MPCkh0HYAVG4i1hXDth//naaSVHt7wVEQ3fdesje5U/XuaAYMbLVce6 Oz2/kECWkY/UIudV24knqNM9Rl5jL8cCUeDuCKE4JeEy5E/Z3STRnEKiETm/YhdF07cr9WoczYYqX 8vDg9Quw1iGIhU2RmONMfyg7V/9rh4DN+/HNjea+5nYI0iE5kteic7gyrNM4ODq2gu4r6dqH06lR3 CHVZOiLqp61m+rL3X/BBRPn1QrLV88KRkGo2Pf5FyXgMqvxrl5gIPv2KPd4CkrmfqbfvJhM0xrK8h J+OcfDRw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t549M-00000008Jy2-2gcz; Sun, 27 Oct 2024 14:21:48 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t549I-00000008JuH-2kUw for linux-nvme@lists.infradead.org; Sun, 27 Oct 2024 14:21:47 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id ADE43A40F9C; Sun, 27 Oct 2024 14:19:47 +0000 (UTC) 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: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241027_072144_962029_2066ABC4 X-CRM114-Status: GOOD ( 13.69 ) X-BeenThere: linux-nvme@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-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org 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 @@ #define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1)) +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 */ +#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 != 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); -- 2.46.2