From patchwork Fri Dec 18 17:39:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 11982643 X-Patchwork-Delegate: bhelgaas@google.com 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 EC38DC2D0E4 for ; Fri, 18 Dec 2020 17:42:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C151C23B5D for ; Fri, 18 Dec 2020 17:42:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732636AbgLRRmd (ORCPT ); Fri, 18 Dec 2020 12:42:33 -0500 Received: from mta-02.yadro.com ([89.207.88.252]:38566 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728091AbgLRRmc (ORCPT ); Fri, 18 Dec 2020 12:42:32 -0500 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id B41DA413E4; Fri, 18 Dec 2020 17:41:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:date:subject :subject:from:from:received:received:received; s=mta-01; t= 1608313270; x=1610127671; bh=p5ojM85KzuWw1dn9l+gXPAqRVLagkNKnmBV ORTqlbZE=; b=OY31YfUjLhcfhtdd//+0ypfwU582Op4Er9rZs90hmLIFeUrB7WB y+t92Yu42Hf5ekeeoiEOXseaIC+FgsFXsCjnRGnRQsvel2QBZPxgkgD2hSz/MZLt iwxadU07nppfZjQ9/+GOoM0xAYRJJ4eM/pKZ1q4NyXShiMpwOQ9AiceQ= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xHt6f202nBdK; Fri, 18 Dec 2020 20:41:10 +0300 (MSK) Received: from T-EXCH-03.corp.yadro.com (t-exch-03.corp.yadro.com [172.17.100.103]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id 8B67A41395; Fri, 18 Dec 2020 20:41:07 +0300 (MSK) Received: from NB-148.yadro.com (172.17.15.136) by T-EXCH-03.corp.yadro.com (172.17.100.103) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Fri, 18 Dec 2020 20:41:06 +0300 From: Sergei Miroshnichenko To: CC: Bjorn Helgaas , Lukas Wunner , Stefan Roese , Andy Lavr , =?utf-8?q?Chris?= =?utf-8?q?tian_K=C3=B6nig?= , David Laight , Rajat Jain , , Sergei Miroshnichenko Subject: [PATCH v9 05/26] PCI: hotplug: Fix reassigning the released BARs Date: Fri, 18 Dec 2020 20:39:50 +0300 Message-ID: <20201218174011.340514-6-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20201218174011.340514-1-s.miroshnichenko@yadro.com> References: <20201218174011.340514-1-s.miroshnichenko@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.15.136] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-03.corp.yadro.com (172.17.100.103) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Bridge windows are temporarily released during a PCI rescan, and their old sizes are not relevant anymore as they will be recreated in pbus_size_*() from scratch. So don't keep it, but instead set to zero after release. If BAR assignment fails after a PCI hotplug event, the kernel will retry with a fall-back reduced configuration, so don't apply reset_resource() for non-window BARs to keep them valid for the next attempt. Signed-off-by: Sergei Miroshnichenko --- drivers/pci/setup-bus.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index bc342eaa98e8..a956f0179064 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -297,7 +297,9 @@ static void assign_requested_resources_sorted(struct list_head *head, 0 /* don't care */, 0 /* don't care */); } - reset_resource(res); + if (!pci_can_move_bars || + idx >= PCI_BRIDGE_RESOURCES) + reset_resource(res); } } } @@ -1616,8 +1618,8 @@ static void pci_bridge_release_resources(struct pci_bus *bus, type = old_flags = r->flags & PCI_RES_TYPE_MASK; pci_info(dev, "resource %d %pR released\n", PCI_BRIDGE_RESOURCES + idx, r); - /* Keep the old size */ - r->end = resource_size(r) - 1; + /* Don't keep the old size if the bridge will be recalculated */ + r->end = pci_can_move_bars ? 0 : (resource_size(r) - 1); r->start = 0; r->flags = 0;