From patchwork Thu Jan 12 11:00:00 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mika Westerberg X-Patchwork-Id: 13097843 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 6A3ABC61DB3 for ; Thu, 12 Jan 2023 11:08:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232065AbjALLIR (ORCPT ); Thu, 12 Jan 2023 06:08:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234214AbjALLHq (ORCPT ); Thu, 12 Jan 2023 06:07:46 -0500 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 14A1A44C63 for ; Thu, 12 Jan 2023 02:59:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1673521172; x=1705057172; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=FmrYbrp0mCXXDjfXC+BP0GpHSC+pCq4u9W2JoFIsGa8=; b=S/Yr5O2W22ctM3rl3c3eMDPk0f92fVZC9oVnIrfdDg+6YyYzJBEULhhh bdlw1ci5hZl8vivYlBspez9GnjERe/7arhDNqWerUYc3s5LGcfESqGUZL q4W8CISowq+OE2qSBlX5nMfXbqy21k/e0yd+xxPg6HmhLHr4DUIiMTUlG KG1F6NOHOP7ZtQiiNkZlzCqWrzT4nG8Pabv8kS/G3NqzI8VfSXoobcUZI x/JFUOEguC1n09AA59q6pxafr3H9XtpaS5Xf3h5aE1QPmO6x6XvDAyf+7 Vhki99b/0W8K1m+27NTfu+cNDH/KGgwfcemxW0hDRis17cMnCys6kLfCb w==; X-IronPort-AV: E=McAfee;i="6500,9779,10586"; a="388141958" X-IronPort-AV: E=Sophos;i="5.96,319,1665471600"; d="scan'208";a="388141958" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2023 02:59:29 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10586"; a="746515484" X-IronPort-AV: E=Sophos;i="5.96,319,1665471600"; d="scan'208";a="746515484" Received: from black.fi.intel.com ([10.237.72.28]) by FMSMGA003.fm.intel.com with ESMTP; 12 Jan 2023 02:59:26 -0800 Received: by black.fi.intel.com (Postfix, from userid 1001) id B264231D; Thu, 12 Jan 2023 13:00:00 +0200 (EET) From: Mika Westerberg To: Bjorn Helgaas Cc: "Rafael J . Wysocki" , Andy Shevchenko , Jonathan Cameron , Lukas Wunner , Chris Chiu , Alexander Motin , Nicholas Johnson , Mika Westerberg , linux-pci@vger.kernel.org Subject: [PATCH v5 3/3] PCI: Distribute available resources for root buses too Date: Thu, 12 Jan 2023 13:00:00 +0200 Message-Id: <20230112110000.59974-4-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230112110000.59974-1-mika.westerberg@linux.intel.com> References: <20230112110000.59974-1-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. 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). 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 --- drivers/pci/setup-bus.c | 57 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 56 insertions(+), 1 deletion(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 30b5388f4a1a..7c5747e4dca1 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1770,7 +1770,10 @@ 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 remove_dev_resource(struct resource *avail, struct pci_dev *dev, @@ -1968,6 +1971,8 @@ 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]; @@ -1979,6 +1984,54 @@ 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 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. @@ -2018,6 +2071,8 @@ 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)