From patchwork Wed Nov 30 11:22:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 13059716 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B60F1C46467 for ; Wed, 30 Nov 2022 11:23:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234343AbiK3LXO (ORCPT ); Wed, 30 Nov 2022 06:23:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235196AbiK3LWE (ORCPT ); Wed, 30 Nov 2022 06:22:04 -0500 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8535E2A95C for ; Wed, 30 Nov 2022 03:21:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1669807318; x=1701343318; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=W7bZT4zWClX08soKykMFh3tRGQYxqbB0fxlKUxPITDo=; b=EUeeCCdtf3Cq1El2z2T/jJLfhhZ10DsNNYoFO4PzFPR8180SK79Nbqn4 WXmWeLSJwsyIk2Xkg0gd7Ftlk4Gg/rawYgOwfU9rg4GipE5EP5qFcB7Ld sQlIzCNHBZIrlvrQyrXOLE7EvAyIXStoL7goa2VCD8bWThw0zLJtMaTCu Tc7WUn4npZz8bgfcgrgUBP1u33u4De1VEIEsewEoTUITMJHQ1OXf4TK2m AG0gjGBDxqul2QRCYnc8KlniKSM2OV61V24cMRt3P4WqoCZlxrd+EAKKy Z2N7Y/B8Lw/EE4Z7NRRpbPvRJQ5yeJ+HRxOaYj5YtZi6/pDztSSvR48Hk g==; X-IronPort-AV: E=McAfee;i="6500,9779,10546"; a="342291720" X-IronPort-AV: E=Sophos;i="5.96,206,1665471600"; d="scan'208";a="342291720" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Nov 2022 03:21:57 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10546"; a="676790602" X-IronPort-AV: E=Sophos;i="5.96,206,1665471600"; d="scan'208";a="676790602" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga001.jf.intel.com with ESMTP; 30 Nov 2022 03:21:54 -0800 Received: by black.fi.intel.com (Postfix, from userid 1001) id A92E7179; Wed, 30 Nov 2022 13:22:21 +0200 (EET) From: Mika Westerberg To: Bjorn Helgaas Cc: "Rafael J . Wysocki" , Andy Shevchenko , Jonathan Cameron , Lukas Wunner , Chris Chiu , linux-pci@vger.kernel.org, Mika Westerberg Subject: [PATCH v3 2/2] PCI: Distribute available resources for root buses too Date: Wed, 30 Nov 2022 13:22:21 +0200 Message-Id: <20221130112221.66612-3-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20221130112221.66612-1-mika.westerberg@linux.intel.com> References: <20221130112221.66612-1-mika.westerberg@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Previously we distributed spare resources only upon hot-add, so if the initial root bus scan found devices that had not been fully configured by the BIOS, we allocated only enough resources to cover what was then present. If some of those devices were hotplug bridges, we did not leave any additional resource space for future expansion. Distribute the available resources for root buses, too, to make this work the same way as the normal hotplug case. Link: https://bugzilla.kernel.org/show_bug.cgi?id=216000 Link: https://lore.kernel.org/r/20220905080232.36087-5-mika.westerberg@linux.intel.com Reported-by: Chris Chiu Signed-off-by: Mika Westerberg --- This is a new version of the patch after the revert due to the regression reported by Jonathan Cameron. This one changes pci_bridge_resources_not_assigned() to work with bridges that do not have all the resource windows programmed by the boot firmware (previously we expected all I/O, memory and prefetchable memory were all programmed). drivers/pci/setup-bus.c | 56 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 55 insertions(+), 1 deletion(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index d456175ddc4f..143ec80cc0b2 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1768,7 +1768,10 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res, } res->end = res->start + new_size - 1; - remove_from_list(add_list, res); + + /* If the resource is part of the add_list remove it now */ + if (add_list) + remove_from_list(add_list, res); } static void pci_bus_distribute_available_resources(struct pci_bus *bus, @@ -1981,6 +1984,8 @@ static void pci_bridge_distribute_available_resources(struct pci_dev *bridge, if (!bridge->is_hotplug_bridge) return; + pci_dbg(bridge, "distributing available resources\n"); + /* Take the initial extra resources from the hotplug port */ available_io = bridge->resource[PCI_BRIDGE_IO_WINDOW]; available_mmio = bridge->resource[PCI_BRIDGE_MEM_WINDOW]; @@ -1992,6 +1997,53 @@ static void pci_bridge_distribute_available_resources(struct pci_dev *bridge, available_mmio_pref); } +static bool pci_bridge_resources_not_assigned(struct pci_dev *dev) +{ + const struct resource *r; + + /* + * Check the child device's resources and if they are not yet + * assigned it means we are configuring them (not the boot + * firmware) so we should be able to extend the upstream + * bridge's (that's the hotplug downstream PCIe port) resources + * in the same way we do with the normal hotplug case. + */ + r = &dev->resource[PCI_BRIDGE_IO_WINDOW]; + if (r->flags && !(r->flags & IORESOURCE_STARTALIGN)) + return false; + r = &dev->resource[PCI_BRIDGE_MEM_WINDOW]; + if (r->flags && !(r->flags & IORESOURCE_STARTALIGN)) + return false; + r = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW]; + if (r->flags && !(r->flags & IORESOURCE_STARTALIGN)) + return false; + + return true; +} + +static void pci_root_bus_distribute_available_resources(struct pci_bus *bus, + struct list_head *add_list) +{ + struct pci_dev *dev, *bridge = bus->self; + + for_each_pci_bridge(dev, bus) { + struct pci_bus *b; + + b = dev->subordinate; + if (!b) + continue; + + /* + * Need to check "bridge" here too because it is NULL + * in case of root bus. + */ + if (bridge && pci_bridge_resources_not_assigned(dev)) + pci_bridge_distribute_available_resources(bridge, add_list); + else + pci_root_bus_distribute_available_resources(b, add_list); + } +} + /* * First try will not touch PCI bridge res. * Second and later try will clear small leaf bridge res. @@ -2031,6 +2083,8 @@ void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus) */ __pci_bus_size_bridges(bus, add_list); + pci_root_bus_distribute_available_resources(bus, add_list); + /* Depth last, allocate resources and update the hardware. */ __pci_bus_assign_resources(bus, add_list, &fail_head); if (add_list)