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 15FABD6409B for ; Sun, 10 Nov 2024 15:00:18 +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=YwvThwxHYJJkKqaQNWxTxm91AL51oJoEpswNkB0je+M=; b=nmbCkbUxdgwoM2DQ9ho0d5/82P LVJNY25aPwjz9x5uSC3sWszS8LwgfhtVsZjQLqjUHk1XglY52gvCViwUOGRt5qLpIh3r+RU9g03Li Rjx1fACcFtbu0pz1oFBFKRlTY3odb6UkIh9VGt/y/6S2UGB9VamI4pn03mojQA1MaYIkwkfRw7bF4 uvT4Uryh2i/ZdXBU6prql+r5C9rOf+Qdb6VZ8Bw5umqj20Eto3a6cztkvHNJ/0pm3hjVQQc6gafhZ a73oN7btX+XAs43huusJ7aC1kBrgMNlUuTIbZddkwmWdlRbJ52htNvQnYF2PB1mImu0UJyRPKBnMy JuqGb8DQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tA9QE-0000000F4GY-3App; Sun, 10 Nov 2024 15:00:14 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tA8ID-0000000EwoO-2FXm for linux-nvme@lists.infradead.org; Sun, 10 Nov 2024 13:48:03 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 1EDDCA40CFE; Sun, 10 Nov 2024 13:45:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 19CC6C4CED0; Sun, 10 Nov 2024 13:47:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731246472; bh=5m1d0+DTyGkZRlNmd/gGqpR64QjDJCq1VneMI9ozY3Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JpQZxNP0/bC5tFyQm/Gazifc4568RD+Yg/FkE3Ofni8YbtijuQWSE5/BsL9I7TRIz d/RXYEPyH8iP4wRDbG6DfLMSA6pPHJTkZz8ENUOag3L+0rObkmUTPhB7xpiELWr3Ff PdmjPeQKogd9FHcx6LxoDC82pYQerSIIilLnnSyObsXYq1XCfW+DK33ZUw9Vl2lOHi lE0hco768LIuDXY/sbzWTGLzhc9cqye91fohpaow/FYKQmoQ7EI73yVjhtxNzfk42g KHLj29NkXl9zLUClqPvWsDxqezWz3ShXkOu2k085FuuJuKznb1m1ZHnJXshTfWxjxQ AtsShAg/8wtvQ== 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, Randy Dunlap Subject: [PATCH v3 04/17] dma-mapping: Add check if IOVA can be used Date: Sun, 10 Nov 2024 15:46:51 +0200 Message-ID: <9515f330b9615de92a1864ab46acbd95e32634b6.1731244445.git.leon@kernel.org> X-Mailer: git-send-email 2.47.0 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-20241110_054754_113156_F70782CC X-CRM114-Status: GOOD ( 13.97 ) 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); -- 2.47.0