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,URIBL_BLOCKED,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 DB15DC43387 for ; Mon, 14 Jan 2019 09:42:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AB44C2086D for ; Mon, 14 Jan 2019 09:42:56 +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="UJUvzdgG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726855AbfANJmy (ORCPT ); Mon, 14 Jan 2019 04:42:54 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:43630 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726812AbfANJmw (ORCPT ); Mon, 14 Jan 2019 04:42:52 -0500 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=R/s9EJiwTJNepM4up7eBOd1B3bS1VpCDgWuWuUkA+N8=; b=UJUvzdgG9sNAPEeUB/AiVlf1vO fkIrSnfvksYy0777SPHNJfvtE+jm309Pl33I3E2SAcPqkK/jzuNZzVGDKdMJlbaeLR8x3P8ppQ8pH OGAuSF6uWw2d/RZm1gyjW+X0634ENvQS5AGmWp1pK7S58B7O16v0LiYMKwjrGjgxBYLMUa2AHBozl bDKO6iBF93mo4rrkhJjEKEqMIOqVQ4Woopa3cmMK3xojqj7lqG6zmTDP3LZIHFjxPM6u0CRjMiy4F nUd8JD/ApsE14vDgId+BPekUcmmRrTO25Ckf0m9QtU4LeWUucuPOvbGh2MyOmz2ckzf3ReoRoL3XL Euiu8Awg==; Received: from 089144213167.atnat0022.highway.a1.net ([89.144.213.167] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1giylZ-0006hK-9V; Mon, 14 Jan 2019 09:42:45 +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 13/19] dma-iommu: don't remap contiguous allocations for coherent devices Date: Mon, 14 Jan 2019 10:41:53 +0100 Message-Id: <20190114094159.27326-14-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190114094159.27326-1-hch@lst.de> References: <20190114094159.27326-1-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 There is no need to remap for pte attributes, or for a virtually contiguous address, so just don't do it. Signed-off-by: Christoph Hellwig --- drivers/iommu/dma-iommu.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index c9788e0c1d5d..710814a370b9 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1041,10 +1041,10 @@ static void *iommu_dma_alloc(struct device *dev, size_t size, addr = iommu_dma_alloc_contiguous(dev, iosize, handle, gfp, attrs); - if (!addr) - return NULL; - page = virt_to_page(addr); + if (coherent || !addr) + return addr; + page = virt_to_page(addr); addr = dma_common_contiguous_remap(page, size, VM_USERMAP, prot, __builtin_return_address(0)); if (!addr) { @@ -1052,8 +1052,7 @@ static void *iommu_dma_alloc(struct device *dev, size_t size, return NULL; } - if (!coherent) - arch_dma_prep_coherent(page, iosize); + arch_dma_prep_coherent(page, iosize); } else { addr = iommu_dma_alloc_remap(dev, iosize, handle, gfp, attrs); } -- 2.20.1