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=-8.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham 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 9B63AC282CE for ; Mon, 22 Apr 2019 18:01:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 67C8621738 for ; Mon, 22 Apr 2019 18:01:16 +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="YhJEalsf" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728658AbfDVSBP (ORCPT ); Mon, 22 Apr 2019 14:01:15 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:40588 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728639AbfDVSBM (ORCPT ); Mon, 22 Apr 2019 14:01:12 -0400 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=P4FAaIW8DgMN+q5PSJEzL/ZF/f2+w+9Z5hXu00tj3vQ=; b=YhJEalsfau+AJycLPlemT+Ms3d yFGYVS5OiHFl0ktpAHnQjjyRqNSXclI01+vwkxsq4LwqGShf9eXMVNbHf4j6QhO3fFo/+JEqpDe11 PZhz0Jcg0cHof3SfYLFv4i3+XwGyVuyNtLSsGLRsXPBwMdaZMWMYUtkZcU6CFwX4OdVjec3hu9ZLq egsjDO8TdBCt8gRCBkeQDphal4ZIr9I/F0xMeMxDkmsEunJALo+3VjIASwZJewtBMOvlo/1H1qGBA OsZK8q98sdRbbYK4zYlyKy4otkJk23DrBeq4Er6ssyIhQxZHBz0mss0yCHqMXxfIGZ6wchQ6Y8bPi VKlSrRyg==; Received: from 213-225-37-80.nat.highway.a1.net ([213.225.37.80] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hIdFW-0002YB-SV; Mon, 22 Apr 2019 18:01:03 +0000 From: Christoph Hellwig To: Robin Murphy Cc: Joerg Roedel , Catalin Marinas , Will Deacon , Tom Lendacky , iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 21/26] iommu/dma: Refactor iommu_dma_get_sgtable Date: Mon, 22 Apr 2019 19:59:37 +0200 Message-Id: <20190422175942.18788-22-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190422175942.18788-1-hch@lst.de> References: <20190422175942.18788-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Inline __iommu_dma_get_sgtable_page into the main function, and use the fact that __iommu_dma_get_pages return NULL for remapped contigous allocations to simplify the code flow a bit. Signed-off-by: Christoph Hellwig --- drivers/iommu/dma-iommu.c | 45 +++++++++++++++------------------------ 1 file changed, 17 insertions(+), 28 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index acdfe866cb29..138b85e675c8 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1070,42 +1070,31 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, return __iommu_dma_mmap(pages, size, vma); } -static int __iommu_dma_get_sgtable_page(struct sg_table *sgt, struct page *page, - size_t size) -{ - int ret = sg_alloc_table(sgt, 1, GFP_KERNEL); - - if (!ret) - sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); - return ret; -} - static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs) { - unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; - struct page **pages; + struct page *page; + int ret; - if (!is_vmalloc_addr(cpu_addr)) { - struct page *page = virt_to_page(cpu_addr); - return __iommu_dma_get_sgtable_page(sgt, page, size); - } + if (is_vmalloc_addr(cpu_addr)) { + struct page **pages = __iommu_dma_get_pages(cpu_addr); - if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { - /* - * DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped, - * hence in the vmalloc space. - */ - struct page *page = vmalloc_to_page(cpu_addr); - return __iommu_dma_get_sgtable_page(sgt, page, size); + if (pages) { + return sg_alloc_table_from_pages(sgt, pages, + PAGE_ALIGN(size) >> PAGE_SHIFT, + 0, size, GFP_KERNEL); + } + + page = vmalloc_to_page(cpu_addr); + } else { + page = virt_to_page(cpu_addr); } - pages = __iommu_dma_get_pages(cpu_addr); - if (WARN_ON_ONCE(!pages)) - return -ENXIO; - return sg_alloc_table_from_pages(sgt, pages, count, 0, size, - GFP_KERNEL); + ret = sg_alloc_table(sgt, 1, GFP_KERNEL); + if (!ret) + sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); + return ret; } static const struct dma_map_ops iommu_dma_ops = { -- 2.20.1