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=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 0ABE5CA9EC5 for ; Wed, 30 Oct 2019 13:25:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D5C7F20856 for ; Wed, 30 Oct 2019 13:25:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726261AbfJ3NZO (ORCPT ); Wed, 30 Oct 2019 09:25:14 -0400 Received: from mga07.intel.com ([134.134.136.100]:37920 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726239AbfJ3NZO (ORCPT ); Wed, 30 Oct 2019 09:25:14 -0400 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 30 Oct 2019 06:25:12 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,247,1569308400"; d="scan'208";a="211322245" Received: from lahna.fi.intel.com (HELO lahna) ([10.237.72.157]) by fmsmga001.fm.intel.com with SMTP; 30 Oct 2019 06:25:09 -0700 Received: by lahna (sSMTP sendmail emulation); Wed, 30 Oct 2019 15:25:09 +0200 Date: Wed, 30 Oct 2019 15:25:09 +0200 From: "mika.westerberg@linux.intel.com" To: Nicholas Johnson Cc: "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , "bhelgaas@google.com" , "corbet@lwn.net" , "benh@kernel.crashing.org" , "logang@deltatee.com" Subject: Re: [PATCH v10 4/4] PCI: Allow extend_bridge_window() to shrink resource if necessary Message-ID: <20191030132509.GE2593@lahna.fi.intel.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Wed, Oct 30, 2019 at 12:47:44PM +0000, Nicholas Johnson wrote: > Remove checks for resource size in extend_bridge_window(). This is > necessary to allow the pci_bus_distribute_available_resources() to > function when the kernel parameter pci=hpmemsize=nn[KMG] is used to > allocate resources. Because the kernel parameter sets the size of all > hotplug bridges to be the same, there are problems when nested hotplug > bridges are encountered. Fitting a downstream hotplug bridge with size X > and normal bridges with non-zero size Y into parent hotplug bridge with > size X is impossible, and hence the downstream hotplug bridge needs to > shrink to fit into its parent. > > Add check for if bridge is extended or shrunken and adjust pci_dbg to > reflect this. > > Reset the resource if its new size is zero (if we have run out of a > bridge window resource) to prevent the PCI resource assignment code from > attempting to assign a zero-sized resource. > > Rename extend_bridge_window() to adjust_bridge_window() to reflect the > fact that the window can now shrink. > > Signed-off-by: Nicholas Johnson Reviewed-by: Mika Westerberg