From patchwork Mon Jun 26 09:18:56 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Murzin X-Patchwork-Id: 9808923 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 5C46D60209 for ; Mon, 26 Jun 2017 09:19:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 64C1328161 for ; Mon, 26 Jun 2017 09:19:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 58F4D2847C; Mon, 26 Jun 2017 09:19:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 9875E28161 for ; Mon, 26 Jun 2017 09:19:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=h7PuF5ofBKH7ixeFYzsm7tTjN2oei6zUy9ECrre/zgU=; b=TKrmacjNyShxtYxDW6qIAdoQFo kdmC9eeWuMlvKNv+NIrLg5239hjKc2JbT3p6bE07tDOUcFeQxJ74hoduadP7MFWCtIezn911jXi4z P4k4Di0et0SpDP5Zi2cjh1+Xlrtl4lQjRb/iZ5Qq1Fqo4TOzSF3TbMjDlHHPIKl4qqXZMtGNl2ell awvoygm2tqW6KrWtyjQed+Xv1aCMQ5CIowPwAo+l3HeeGEjPYMOGRsXrw4Hr0PlltzAFz/Yk6iDy3 hRxzboHKLrINd8Bb3A1DXNb4b6VS52+rNj8dQti48IevYrObPeW7aiBI0iQIzCiNOJ7BPP2mx4y7M FEzhK/RQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dPQBN-00029Y-P3; Mon, 26 Jun 2017 09:19:45 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1dPQBJ-000283-PK for linux-arm-kernel@lists.infradead.org; Mon, 26 Jun 2017 09:19:43 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8D3FF15B2; Mon, 26 Jun 2017 02:19:26 -0700 (PDT) Received: from bc-a7-1-12.euhpc.arm.com. (bc-a7-1-12.euhpc.arm.com [10.6.2.73]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 4C3E63F587; Mon, 26 Jun 2017 02:19:24 -0700 (PDT) From: Vladimir Murzin To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v6 2/7] dma: Add simple dma_noop_mmap Date: Mon, 26 Jun 2017 10:18:56 +0100 Message-Id: <1498468741-12020-3-git-send-email-vladimir.murzin@arm.com> X-Mailer: git-send-email 2.0.0 In-Reply-To: <1498468741-12020-1-git-send-email-vladimir.murzin@arm.com> References: <1498468741-12020-1-git-send-email-vladimir.murzin@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170626_021941_856181_F932697A X-CRM114-Status: UNSURE ( 9.02 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Joerg Roedel , sza@esh.hu, arnd@arndb.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux@armlinux.org.uk, Christian Borntraeger , kbuild-all@01.org, benjamin.gaignard@linaro.org, akpm@linux-foundation.org, m.szyprowski@samsung.com, robin.murphy@arm.com, hch@lst.de, alexandre.torgue@st.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a simple implementation of mmap to dma_noop_ops. Cc: Joerg Roedel Cc: Christian Borntraeger Reported-by: Benjamin Gaignard Tested-by: Benjamin Gaignard Tested-by: Andras Szemzo Tested-by: Alexandre TORGUE Signed-off-by: Vladimir Murzin --- lib/dma-noop.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/lib/dma-noop.c b/lib/dma-noop.c index 1f60c8a..4b43d15 100644 --- a/lib/dma-noop.c +++ b/lib/dma-noop.c @@ -67,6 +67,29 @@ static int dma_noop_supported(struct device *dev, u64 mask) return 1; } +static int dma_noop_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs) +{ + unsigned long user_count = vma_pages(vma); + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); + unsigned long off = vma->vm_pgoff; + int ret = -ENXIO; + + if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret)) + return ret; + + if (off < count && user_count <= (count - off)) { + ret = remap_pfn_range(vma, vma->vm_start, + pfn + off, + user_count << PAGE_SHIFT, + vma->vm_page_prot); + } + + return ret; +} + const struct dma_map_ops dma_noop_ops = { .alloc = dma_noop_alloc, .free = dma_noop_free, @@ -74,6 +97,7 @@ const struct dma_map_ops dma_noop_ops = { .map_sg = dma_noop_map_sg, .mapping_error = dma_noop_mapping_error, .dma_supported = dma_noop_supported, + .mmap = dma_noop_mmap, }; EXPORT_SYMBOL(dma_noop_ops);