From patchwork Sat Dec 8 17:36:55 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10719567 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A98CC112E for ; Sat, 8 Dec 2018 17:37:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 89D742ABED for ; Sat, 8 Dec 2018 17:37:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7D2322AE27; Sat, 8 Dec 2018 17:37:24 +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=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 30B362AB65 for ; Sat, 8 Dec 2018 17:37:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 044B26E075; Sat, 8 Dec 2018 17:37:20 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by gabe.freedesktop.org (Postfix) with ESMTPS id 26CED6E091 for ; Sat, 8 Dec 2018 17:37:19 +0000 (UTC) Received: from [184.48.100.57] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1gVgXH-000543-PA; Sat, 08 Dec 2018 17:37:03 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Subject: [PATCH 03/10] arm64/iommu: implement support for DMA_ATTR_NON_CONSISTENT Date: Sat, 8 Dec 2018 09:36:55 -0800 Message-Id: <20181208173702.15158-4-hch@lst.de> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181208173702.15158-1-hch@lst.de> References: <20181208173702.15158-1-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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, Vineet Gupta , Robin Murphy , dri-devel@lists.freedesktop.org, "Matwey V. Kornilov" , openrisc@lists.librecores.org, Laurent Pinchart , sparclinux@vger.kernel.org, linux-snps-arc@lists.infradead.org, Ezequiel Garcia , linux-arm-kernel@vger.kernel.org, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP DMA_ATTR_NON_CONSISTENT forces contiguous allocations as we don't want to remap, and is otherwise forced down the same pass as if we were always on a coherent device. No new code required except for a few conditionals. Signed-off-by: Christoph Hellwig --- arch/arm64/mm/dma-mapping.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index d39b60113539..0010688ca30e 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -240,7 +240,8 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, dma_free_from_pool(addr, size); addr = NULL; } - } else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { + } else if (attrs & (DMA_ATTR_FORCE_CONTIGUOUS | + DMA_ATTR_NON_CONSISTENT)) { pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs); struct page *page; @@ -256,7 +257,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, return NULL; } - if (coherent) { + if (coherent || (attrs & DMA_ATTR_NON_CONSISTENT)) { memset(addr, 0, size); return addr; } @@ -309,7 +310,8 @@ static void __iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr, if (dma_in_atomic_pool(cpu_addr, size)) { iommu_dma_unmap_page(dev, handle, iosize, 0, 0); dma_free_from_pool(cpu_addr, size); - } else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { + } else if (attrs & (DMA_ATTR_FORCE_CONTIGUOUS | + DMA_ATTR_NON_CONSISTENT)) { struct page *page = vmalloc_to_page(cpu_addr); iommu_dma_unmap_page(dev, handle, iosize, 0, attrs); @@ -342,10 +344,11 @@ static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma, if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) return ret; - if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { + if (attrs & (DMA_ATTR_FORCE_CONTIGUOUS | DMA_ATTR_NON_CONSISTENT)) { unsigned long pfn; - if (dev_is_dma_coherent(dev)) + if (dev_is_dma_coherent(dev) || + (attrs & DMA_ATTR_NON_CONSISTENT)) pfn = virt_to_pfn(cpu_addr); else pfn = vmalloc_to_pfn(cpu_addr); @@ -366,10 +369,11 @@ static int __iommu_get_sgtable(struct device *dev, struct sg_table *sgt, unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; struct vm_struct *area = find_vm_area(cpu_addr); - if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { + if (attrs & (DMA_ATTR_FORCE_CONTIGUOUS | DMA_ATTR_NON_CONSISTENT)) { struct page *page; - if (dev_is_dma_coherent(dev)) + if (dev_is_dma_coherent(dev) || + (attrs & DMA_ATTR_NON_CONSISTENT)) page = virt_to_page(cpu_addr); else page = vmalloc_to_page(cpu_addr);