From patchwork Wed Jan 10 08:00:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 858048 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=sparclinux-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.b="ok34micR"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3zGhQj6szSz9ryk for ; Wed, 10 Jan 2018 19:05:49 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753828AbeAJIFr (ORCPT ); Wed, 10 Jan 2018 03:05:47 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:54326 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965440AbeAJIBt (ORCPT ); Wed, 10 Jan 2018 03:01:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding: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=CX1zuxJARuw9pJjSQKZbBPexsVAZhsP7gC/aAs5WFL8=; b=ok34micRRuZ2v46DA5l98zY1c VFYKnCQ5Rui2yQdMeOjRlUAq6BvwS2PLPFiTyuPpYs0wF5+XVhyFbL2G9IjdJD7OMQLXdwIVF05wu 4nE7alAAA7+xl4/f7ySeOpWyoAaNvCDcJkZyxLA0voXWD/CnuqOgDv5ON6cB2bKbhi+hXhzS2gzdp nigOYlSsgVISnmkHjc0rlunw0B11Jjh6fA78uh3loeHtpVLm/OO6FVcp8lDkQ8o5+5bCspTcqMOTL lnGGSx3q6txnVVOEjO0ZOfjHCzm8l1LtNWVC/BP8/+jFvX/3xSxecXKl82Rd5n8v8/0gJIg+TGb7x ocrr/pFCw==; Received: from clnet-p099-196.ikbnet.co.at ([83.175.99.196] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1eZBKR-0005Kg-0y; Wed, 10 Jan 2018 08:01:43 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: Konrad Rzeszutek Wilk , linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-c6x-dev@linux-c6x.org, linux-cris-kernel@axis.com, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-metag@vger.kernel.org, Michal Simek , linux-mips@linux-mips.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, patches@groups.riscv.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, Guan Xuetao , x86@kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 24/33] dma-direct: use phys_to_dma Date: Wed, 10 Jan 2018 09:00:18 +0100 Message-Id: <20180110080027.13879-25-hch@lst.de> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20180110080027.13879-1-hch@lst.de> References: <20180110080027.13879-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: sparclinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: sparclinux@vger.kernel.org This means it uses whatever linear remapping scheme that the architecture provides is used in the generic dma_direct ops. Signed-off-by: Christoph Hellwig Reviewed-by: Vladimir Murzin --- lib/dma-direct.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/lib/dma-direct.c b/lib/dma-direct.c index 0ec3262a3148..12ea9653781b 100644 --- a/lib/dma-direct.c +++ b/lib/dma-direct.c @@ -1,12 +1,11 @@ // SPDX-License-Identifier: GPL-2.0 /* - * lib/dma-noop.c - * - * DMA operations that map to physical addresses without flushing memory. + * DMA operations that map physical memory directly without using an IOMMU or + * flushing caches. */ #include #include -#include +#include #include #include @@ -17,7 +16,7 @@ static void *dma_direct_alloc(struct device *dev, size_t size, ret = (void *)__get_free_pages(gfp, get_order(size)); if (ret) - *dma_handle = virt_to_phys(ret) - PFN_PHYS(dev->dma_pfn_offset); + *dma_handle = phys_to_dma(dev, virt_to_phys(ret)); return ret; } @@ -32,7 +31,7 @@ static dma_addr_t dma_direct_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, unsigned long attrs) { - return page_to_phys(page) + offset - PFN_PHYS(dev->dma_pfn_offset); + return phys_to_dma(dev, page_to_phys(page)) + offset; } static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, @@ -42,12 +41,9 @@ static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, struct scatterlist *sg; for_each_sg(sgl, sg, nents, i) { - dma_addr_t offset = PFN_PHYS(dev->dma_pfn_offset); - void *va; - BUG_ON(!sg_page(sg)); - va = sg_virt(sg); - sg_dma_address(sg) = (dma_addr_t)virt_to_phys(va) - offset; + + sg_dma_address(sg) = phys_to_dma(dev, sg_phys(sg)); sg_dma_len(sg) = sg->length; }