From patchwork Fri Dec 29 08:18:53 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 10136585 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 4C361603FA for ; Fri, 29 Dec 2017 08:28:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 39EAC2BF45 for ; Fri, 29 Dec 2017 08:28:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2E3702C169; Fri, 29 Dec 2017 08:28:47 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C81362BFAA for ; Fri, 29 Dec 2017 08:28:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932889AbdL2I2k (ORCPT ); Fri, 29 Dec 2017 03:28:40 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:48295 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755641AbdL2IXC (ORCPT ); Fri, 29 Dec 2017 03:23:02 -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=p3vgCQXrDnda2/WFmLsq0tbPPXmf96G94BW/MOzrLv0=; b=I8XiC3DCfFX4+km8rB+g26wHe 52A70U7Nuw+FUx28Ys2XJasOtPGXnQJftYaUM1FDZOyBNsSHniee76VQeLjDijfHdhqMwC3xSdeg5 SeN4UjX2oSWWTagCDv99GINGoJHf+xprTBklKB9Elnwn3AfdxqiYYelB/q87rO5Wtf+jT73KodPWo PJnV757w4tM9JLcVd3IATUGhLK4djTZLTRECDWUzRKu1pH95nLk6k+kLOCvHlVcC/BRm+sACtIcT+ 85ifwp+jxo9zF1VCsAe7Mllh40LEr6ud/kvJ4mHCjFMIrbLjIxNTe59HtbIAaDeMAoOwnsRtejVm2 fBHqcQphw==; Received: from 77.117.237.29.wireless.dyn.drei.com ([77.117.237.29] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1eUpwI-0003F3-G7; Fri, 29 Dec 2017 08:22:51 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, adi-buildroot-devel@lists.sourceforge.net, 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 49/67] swiotlb: refactor coherent buffer freeing Date: Fri, 29 Dec 2017 09:18:53 +0100 Message-Id: <20171229081911.2802-50-hch@lst.de> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171229081911.2802-1-hch@lst.de> References: <20171229081911.2802-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Factor out a new swiotlb_free_buffer helper that checks if an address is allocated from the swiotlb bounce buffer, and if yes frees it. This allows to simplify the swiotlb_free implemenation that uses dma_direct_free to free the non-bounce buffer allocations. Signed-off-by: Christoph Hellwig --- lib/swiotlb.c | 35 +++++++++++++++++++++-------------- 1 file changed, 21 insertions(+), 14 deletions(-) diff --git a/lib/swiotlb.c b/lib/swiotlb.c index a14fff30ee9d..adb4dd0091fa 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -773,22 +773,31 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size, } EXPORT_SYMBOL(swiotlb_alloc_coherent); +static bool swiotlb_free_buffer(struct device *dev, size_t size, + dma_addr_t dma_addr) +{ + phys_addr_t phys_addr = dma_to_phys(dev, dma_addr); + + WARN_ON_ONCE(irqs_disabled()); + + if (!is_swiotlb_buffer(phys_addr)) + return false; + + /* + * DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single. + * DMA_ATTR_SKIP_CPU_SYNC is optional. + */ + swiotlb_tbl_unmap_single(dev, phys_addr, size, DMA_TO_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); + return true; +} + void swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dev_addr) { - phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); - - WARN_ON(irqs_disabled()); - if (!is_swiotlb_buffer(paddr)) + if (!swiotlb_free_buffer(hwdev, size, dev_addr)) free_pages((unsigned long)vaddr, get_order(size)); - else - /* - * DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single. - * DMA_ATTR_SKIP_CPU_SYNC is optional. - */ - swiotlb_tbl_unmap_single(hwdev, paddr, size, DMA_TO_DEVICE, - DMA_ATTR_SKIP_CPU_SYNC); } EXPORT_SYMBOL(swiotlb_free_coherent); @@ -1103,9 +1112,7 @@ void *swiotlb_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, void swiotlb_free(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_addr, unsigned long attrs) { - if (is_swiotlb_buffer(dma_to_phys(dev, dma_addr))) - swiotlb_free_coherent(dev, size, vaddr, dma_addr); - else + if (!swiotlb_free_buffer(dev, size, dma_addr)) dma_direct_free(dev, size, vaddr, dma_addr, attrs); }