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 X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB432C0650F for ; Mon, 5 Aug 2019 09:12:19 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 81F662067D for ; Mon, 5 Aug 2019 09:12:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="t/QmNF9K" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 81F662067D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id B5321DB1; Mon, 5 Aug 2019 09:12:14 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id DEF40D8D for ; Mon, 5 Aug 2019 09:12:13 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 77C73829 for ; Mon, 5 Aug 2019 09:12:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=urEmUUgdHQK/RXisjgziTewBbi9Y6Q1gTs0AWjfkJa4=; b=t/QmNF9K0u3YouJ4rprzdwLiu3 pq0Ju27OXGFCUDZNcHEg1LqwhycGIlPuO9U6/SIVaWFJ3jJJq32TokI9y+h6Y7nhet9HM9ZQF/6Bi 43+BNkAzi4O31w4OniYVzgQ+zBiJ5QxviAimO5OFhNLV5sHoBI2AyB2LMVuj7S0/TbTPB5tlQhODs hPdLd+WCQj4Cckuo2FZHSP27KP/5vA+VqCt+emHHWH/89phj6Iu0X+UgrEdmFrZ+ZpB4dsa6VcnIm GFA3VknvjrcVZbn0/OIVzey1wxfRVSmbi/SwzhAkTswnvvqZz9QHC67atngF7ukZiGzmNlg+BGbKK TtYIr4tQ==; Received: from [195.167.85.94] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1huZ2I-0004x8-6E; Mon, 05 Aug 2019 09:12:11 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org, Marek Szyprowski Subject: [PATCH 3/7] dma-mapping: add a dma_can_mmap helper Date: Mon, 5 Aug 2019 12:11:55 +0300 Message-Id: <20190805091159.7826-4-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190805091159.7826-1-hch@lst.de> References: <20190805091159.7826-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Cc: linux-xtensa@linux-xtensa.org, Michal Simek , linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, Takashi Iwai , linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, Robin Murphy , linux-arm-kernel@lists.infradead.org X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Add a helper to check if DMA allocations for a specific device can be mapped to userspace using dma_mmap_*. Signed-off-by: Christoph Hellwig --- include/linux/dma-mapping.h | 5 +++++ kernel/dma/mapping.c | 23 +++++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index f7d1eea32c78..17271857be5d 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -462,6 +462,7 @@ int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs); +bool dma_can_mmap(struct device *dev); int dma_supported(struct device *dev, u64 mask); int dma_set_mask(struct device *dev, u64 mask); int dma_set_coherent_mask(struct device *dev, u64 mask); @@ -552,6 +553,10 @@ static inline int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, { return -ENXIO; } +static inline bool dma_can_mmap(struct device *dev) +{ + return false; +} static inline int dma_supported(struct device *dev, u64 mask) { return 0; diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index cdb157cd70e7..ab6aa355e1a0 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -203,6 +203,29 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, #endif /* !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */ } +/** + * dma_can_mmap - check if a given device supports dma_mmap_* + * @dev: device to check + * + * Returns %true if @dev supports dma_mmap_coherent() and dma_mmap_attrs() to + * map DMA allocations to userspace. + */ +bool dma_can_mmap(struct device *dev) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + if (IS_ENABLED(CONFIG_ARCH_NO_COHERENT_DMA_MMAP)) + return false; + + if (dma_is_direct(ops)) { + return dev_is_dma_coherent(dev) || + IS_ENABLED(CONFIG_ARCH_HAS_DMA_COHERENT_TO_PFN); + } + + return ops->mmap != NULL; +} +EXPORT_SYMBOL_GPL(dma_can_mmap); + /** * dma_mmap_attrs - map a coherent DMA allocation into user space * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices -- 2.20.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu