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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 78225C41514 for ; Fri, 16 Aug 2019 16:51:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 481092171F for ; Fri, 16 Aug 2019 16:51:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="bZErLqDl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727164AbfHPQvU (ORCPT ); Fri, 16 Aug 2019 12:51:20 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:51430 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727005AbfHPQvU (ORCPT ); Fri, 16 Aug 2019 12:51:20 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 20AB342EFD; Fri, 16 Aug 2019 16:51:19 +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= 1565974278; x=1567788679; bh=M+gogfR2IwFzIh3pAR+wf4b4p4UjXgnyLJb nmGzR0gY=; b=bZErLqDl8aKZJ7dZfZP76st6xN+SRva81IivHSfjD+vu3RCycd+ vvZBrjvySe9hSEexFkN/RG0Tj3AyK396XC0RoJtKDqAcGfSq+RCkoZauhpftlr9g 7Vb5gzkA7ZbDZzM5TSa0u6tfnGxLJs/j4VV4KhDqZHuXF5RbhaUcN38A= 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 6lm-U0g4Tf5v; Fri, 16 Aug 2019 19:51:18 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (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 476B742EE0; Fri, 16 Aug 2019 19:51:12 +0300 (MSK) Received: from NB-148.yadro.com (172.17.15.60) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Fri, 16 Aug 2019 19:51:11 +0300 From: Sergey Miroshnichenko To: , CC: Bjorn Helgaas , , Sergey Miroshnichenko Subject: [PATCH v5 16/23] PCI: hotplug: movable BARs: Don't reserve IO/mem bus space Date: Fri, 16 Aug 2019 19:50:54 +0300 Message-ID: <20190816165101.911-17-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190816165101.911-1-s.miroshnichenko@yadro.com> References: <20190816165101.911-1-s.miroshnichenko@yadro.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [172.17.15.60] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org A hotplugged bridge with many hotplug-capable ports may request reserving more IO space than the machine has. This could be overridden with the "hpiosize=" kernel argument though. But when BARs are movable, there are no need to reserve space anymore: new BARs are allocated not from reserved gaps, but via rearranging the existing BARs. Requesting a precise amount of space for bridge windows increases the chances of adding the new bridge successfully. Signed-off-by: Sergey Miroshnichenko --- drivers/pci/setup-bus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index c7b7e30c6284..7d64ec8e7088 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1287,7 +1287,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head) case PCI_HEADER_TYPE_BRIDGE: pci_bridge_check_ranges(bus); - if (bus->self->is_hotplug_bridge) { + if (bus->self->is_hotplug_bridge && !pci_movable_bars_enabled()) { additional_io_size = pci_hotplug_io_size; additional_mem_size = pci_hotplug_mem_size; } -- 2.21.0