From patchwork Wed Mar 22 06:27:44 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhen Lei X-Patchwork-Id: 95695 Delivered-To: patch@linaro.org Received: by 10.140.89.233 with SMTP id v96csp86321qgd; Tue, 21 Mar 2017 23:30:03 -0700 (PDT) X-Received: by 10.99.127.29 with SMTP id a29mr25680657pgd.11.1490164203367; Tue, 21 Mar 2017 23:30:03 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id r5si423551pfl.34.2017.03.21.23.30.03; Tue, 21 Mar 2017 23:30:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758831AbdCVG3y (ORCPT + 16 others); Wed, 22 Mar 2017 02:29:54 -0400 Received: from szxga02-in.huawei.com ([45.249.212.188]:4349 "EHLO dggrg02-dlp.huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752391AbdCVG32 (ORCPT ); Wed, 22 Mar 2017 02:29:28 -0400 Received: from 172.30.72.54 (EHLO DGGEML404-HUB.china.huawei.com) ([172.30.72.54]) by dggrg02-dlp.huawei.com (MOS 4.4.6-GA FastPath queued) with ESMTP id AKH60777; Wed, 22 Mar 2017 14:29:21 +0800 (CST) Received: from localhost (10.177.23.164) by DGGEML404-HUB.china.huawei.com (10.3.17.39) with Microsoft SMTP Server id 14.3.301.0; Wed, 22 Mar 2017 14:29:11 +0800 From: Zhen Lei To: Joerg Roedel , iommu , Robin Murphy , David Woodhouse , Sudeep Dutt , Ashutosh Dixit , linux-kernel CC: Zefan Li , Xinwei Hu , "Tianhong Ding" , Hanjun Guo , Zhen Lei Subject: [PATCH 4/7] iommu/iova: adjust __cached_rbnode_insert_update Date: Wed, 22 Mar 2017 14:27:44 +0800 Message-ID: <1490164067-12552-5-git-send-email-thunder.leizhen@huawei.com> X-Mailer: git-send-email 1.9.5.msysgit.0 In-Reply-To: <1490164067-12552-1-git-send-email-thunder.leizhen@huawei.com> References: <1490164067-12552-1-git-send-email-thunder.leizhen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.23.164] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0205.58D219C3.03ED, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 6ffe392b6f421bbc1a91bc063760fe73 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For case 2 and 3, adjust cached32_node to the new place, case 1 keep no change. For example: case1: (the right part was allocated) |------------------------------| |<-----free---->|<--new_iova-->| | | cached32_node case2: (all was allocated) |------------------------------| |<---------new_iova----------->| | | cached32_node case3: |-----------------------|......|---------| |..free..|<--new_iova-->| | | | | cached32_node(new) cached32_node(old) Signed-off-by: Zhen Lei --- drivers/iommu/iova.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) -- 2.5.0 diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c index b5a148e..87a9332 100644 --- a/drivers/iommu/iova.c +++ b/drivers/iommu/iova.c @@ -91,12 +91,16 @@ __get_cached_rbnode(struct iova_domain *iovad, unsigned long *limit_pfn) } static void -__cached_rbnode_insert_update(struct iova_domain *iovad, - unsigned long limit_pfn, struct iova *new) +__cached_rbnode_insert_update(struct iova_domain *iovad, struct iova *new) { - if (limit_pfn != iovad->dma_32bit_pfn) + struct iova *cached_iova; + + if (new->pfn_hi > iovad->dma_32bit_pfn) return; - iovad->cached32_node = &new->node; + + cached_iova = rb_entry(iovad->cached32_node, struct iova, node); + if (new->pfn_lo <= cached_iova->pfn_lo) + iovad->cached32_node = rb_prev(&new->node); } static void @@ -131,12 +135,10 @@ static int __alloc_and_insert_iova_range(struct iova_domain *iovad, { struct rb_node *prev, *curr; unsigned long flags; - unsigned long saved_pfn; unsigned long pad_size = 0; /* Walk the tree backwards */ spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); - saved_pfn = limit_pfn; curr = __get_cached_rbnode(iovad, &limit_pfn); prev = curr; while (curr) { @@ -197,11 +199,10 @@ static int __alloc_and_insert_iova_range(struct iova_domain *iovad, rb_link_node(&new->node, parent, entry); rb_insert_color(&new->node, &iovad->rbroot); } - __cached_rbnode_insert_update(iovad, saved_pfn, new); + __cached_rbnode_insert_update(iovad, new); spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); - return 0; }