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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 C360FC07E94 for ; Fri, 4 Jun 2021 15:36:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AB79B6140B for ; Fri, 4 Jun 2021 15:36:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230105AbhFDPiI (ORCPT ); Fri, 4 Jun 2021 11:38:08 -0400 Received: from 8bytes.org ([81.169.241.247]:42364 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229924AbhFDPiH (ORCPT ); Fri, 4 Jun 2021 11:38:07 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id 86D2A3A9; Fri, 4 Jun 2021 17:36:20 +0200 (CEST) Date: Fri, 4 Jun 2021 17:36:19 +0200 From: Joerg Roedel To: Wang Xingang Cc: robh@kernel.org, will@kernel.org, helgaas@kernel.org, robh+dt@kernel.org, gregkh@linuxfoundation.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, xieyingtai@huawei.com Subject: Re: [PATCH v4] iommu/of: Fix pci_request_acs() before enumerating PCI devices Message-ID: References: <1621566204-37456-1-git-send-email-wangxingang5@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1621566204-37456-1-git-send-email-wangxingang5@huawei.com> Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Fri, May 21, 2021 at 03:03:24AM +0000, Wang Xingang wrote: > From: Xingang Wang > > When booting with devicetree, the pci_request_acs() is called after the > enumeration and initialization of PCI devices, thus the ACS is not > enabled. And ACS should be enabled when IOMMU is detected for the > PCI host bridge, so add check for IOMMU before probe of PCI host and call > pci_request_acs() to make sure ACS will be enabled when enumerating PCI > devices. > > Fixes: 6bf6c24720d33 ("iommu/of: Request ACS from the PCI core when > configuring IOMMU linkage") > Signed-off-by: Xingang Wang > --- > drivers/iommu/of_iommu.c | 1 - > drivers/pci/of.c | 8 +++++++- > 2 files changed, 7 insertions(+), 2 deletions(-) Should probably go through the PCI tree, so Acked-by: Joerg Roedel