From patchwork Wed Mar 29 11:58:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wu Zongyong X-Patchwork-Id: 1762725 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4PmlT53TZSz1yYb for ; Wed, 29 Mar 2023 22:59:05 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229875AbjC2L7C (ORCPT ); Wed, 29 Mar 2023 07:59:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229796AbjC2L64 (ORCPT ); Wed, 29 Mar 2023 07:58:56 -0400 Received: from out30-101.freemail.mail.aliyun.com (out30-101.freemail.mail.aliyun.com [115.124.30.101]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4288A4219; Wed, 29 Mar 2023 04:58:54 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R101e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045176;MF=wuzongyong@linux.alibaba.com;NM=1;PH=DS;RN=8;SR=0;TI=SMTPD_---0VewkHe8_1680091126; Received: from L-PF27918B-1352.localdomain(mailfrom:wuzongyong@linux.alibaba.com fp:SMTPD_---0VewkHe8_1680091126) by smtp.aliyun-inc.com; Wed, 29 Mar 2023 19:58:51 +0800 From: Wu Zongyong To: sdonthineni@nvidia.com, bhelgaas@google.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Wu Zongyong , wllenyj@linux.alibaba.com, wutu.xq2@linux.alibaba.com, gerry@linux.alibaba.com Subject: [RFC PATCH] PCI: avoid SBR for NVIDIA T4 Date: Wed, 29 Mar 2023 19:58:45 +0800 Message-Id: <388bc353a5f88edb502ec04c0dc53ab62a526020.1680090885.git.wuzongyong@linux.alibaba.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-8.0 required=5.0 tests=ENV_AND_HDR_SPF_MATCH, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_IN_DEF_SPF_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org 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. Maybe NVIDIA guys can do some detailed explanation abount the SBR behaviour of GPUs. Signed-off-by: Wu Zongyong --- drivers/pci/quirks.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 44cab813bf95..be86b93b9e38 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -3618,7 +3618,7 @@ static void quirk_no_bus_reset(struct pci_dev *dev) */ static void quirk_nvidia_no_bus_reset(struct pci_dev *dev) { - if ((dev->device & 0xffc0) == 0x2340) + if ((dev->device & 0xffc0) == 0x2340 || dev->device == 0x1eb8) quirk_no_bus_reset(dev); } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,