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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 668DBC74A5B for ; Thu, 30 Mar 2023 02:41:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229567AbjC3ClU (ORCPT ); Wed, 29 Mar 2023 22:41:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59078 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229493AbjC3ClQ (ORCPT ); Wed, 29 Mar 2023 22:41:16 -0400 Received: from bmailout1.hostsharing.net (bmailout1.hostsharing.net [IPv6:2a01:37:1000::53df:5f64:0]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2AAC14EEF; Wed, 29 Mar 2023 19:41:14 -0700 (PDT) Received: from h08.hostsharing.net (h08.hostsharing.net [IPv6:2a01:37:1000::53df:5f1c:0]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "*.hostsharing.net", Issuer "RapidSSL Global TLS RSA4096 SHA256 2022 CA1" (verified OK)) by bmailout1.hostsharing.net (Postfix) with ESMTPS id 52BCB300097D9; Thu, 30 Mar 2023 04:41:12 +0200 (CEST) Received: by h08.hostsharing.net (Postfix, from userid 100393) id 460D21FE11; Thu, 30 Mar 2023 04:41:12 +0200 (CEST) Date: Thu, 30 Mar 2023 04:41:12 +0200 From: Lukas Wunner To: Wu Zongyong Cc: sdonthineni@nvidia.com, bhelgaas@google.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, wllenyj@linux.alibaba.com, wutu.xq2@linux.alibaba.com, gerry@linux.alibaba.com Subject: Re: [RFC PATCH] PCI: avoid SBR for NVIDIA T4 Message-ID: <20230330024112.GA27387@wunner.de> References: <388bc353a5f88edb502ec04c0dc53ab62a526020.1680090885.git.wuzongyong@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <388bc353a5f88edb502ec04c0dc53ab62a526020.1680090885.git.wuzongyong@linux.alibaba.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 29, 2023 at 07:58:45PM +0800, Wu Zongyong wrote: > Secondary bus reset will fail if NVIDIA T4 card is direct attached to a > root port. > So avoid to do bus reset, pci_parent_bus_reset() works nomarlly. If you cherry-pick commits 8ef0217227b4 ("PCI/PM: Observe reset delay irrespective of bridge_d3") ac91e6980563 ("PCI: Unify delay handling for reset and resume") from v6.3-rc1, does the issue still persist? Thanks, Lukas