From patchwork Thu Oct 24 17:12:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 1183326 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=yadro.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=yadro.com header.i=@yadro.com header.b="FNEv5+gi"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 46zYht1ckKz9sPv for ; Fri, 25 Oct 2019 04:12:46 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2409988AbfJXRMo (ORCPT ); Thu, 24 Oct 2019 13:12:44 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:48770 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2405917AbfJXRMo (ORCPT ); Thu, 24 Oct 2019 13:12:44 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id C472343D79; Thu, 24 Oct 2019 17:12:42 +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= 1571937161; x=1573751562; bh=j5t3xGbzow+1zdXT65WFVb8pwBW7/xPMS3e sfMQkuWM=; b=FNEv5+gin/VbyQV+aEv6abCeERWAz+P3v4l0p1wHCLcsAms1OSf USrkyH7WctBiKsjOFw97cBboizLOfQiKIjpS3QzMUGSIl4pTWi1GYPVGJsxomq0n iJYgH96qStYlTAu/hMv5RpVHyiQ8UgCheVQbUMtkyqHk9qSBwSWofiAY= 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 yVCoI2Lpkmve; Thu, 24 Oct 2019 20:12:41 +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 17D4B42F14; Thu, 24 Oct 2019 20:12:41 +0300 (MSK) Received: from NB-148.yadro.com (172.17.15.136) 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; Thu, 24 Oct 2019 20:12:39 +0300 From: Sergey Miroshnichenko To: , CC: Bjorn Helgaas , , Sergey Miroshnichenko Subject: [PATCH v6 04/30] PCI: Define PCI-specific version of the release_child_resources() Date: Thu, 24 Oct 2019 20:12:02 +0300 Message-ID: <20191024171228.877974-5-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191024171228.877974-1-s.miroshnichenko@yadro.com> References: <20191024171228.877974-1-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-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 If release the bridge resources with standard release_child_resources(), it drops the .start field of children's BARs to zero, but with the STARTALIGN flag remaining set, which makes the resource invalid for reassignment. Some resources must preserve their offset and size: those marked with the PCI_FIXED and the immovable ones - which are bound by drivers without support of the movable BARs feature. Add the pci_release_child_resources() to replace release_child_resources() in handling the described PCI-specific cases. Signed-off-by: Sergey Miroshnichenko --- drivers/pci/setup-bus.c | 54 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index e7dbe21705ba..2c02eb1acf5d 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1482,6 +1482,54 @@ static void __pci_bridge_assign_resources(const struct pci_dev *bridge, (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH |\ IORESOURCE_MEM_64) +/* + * Similar to generic release_child_resources(), but aware of immovable BARs and + * PCI_FIXED and STARTALIGN flags + */ +static void pci_release_child_resources(struct pci_bus *bus, struct resource *r) +{ + struct pci_dev *dev; + + if (!bus || !r) + return; + + if (r->flags & IORESOURCE_PCI_FIXED) + return; + + r->child = NULL; + + list_for_each_entry(dev, &bus->devices, bus_list) { + int i; + + for (i = 0; i < PCI_NUM_RESOURCES; i++) { + struct resource *tmp = &dev->resource[i]; + resource_size_t size = resource_size(tmp); + + if (!tmp->flags || tmp->parent != r) + continue; + + tmp->parent = NULL; + tmp->sibling = NULL; + + pci_release_child_resources(dev->subordinate, tmp); + + tmp->flags &= ~IORESOURCE_STARTALIGN; + tmp->flags |= IORESOURCE_SIZEALIGN; + + if (!pci_dev_bar_movable(dev, tmp)) { + pci_dbg(dev, "release immovable %pR (%s), keep its flags, base and size\n", + tmp, tmp->name); + continue; + } + + pci_dbg(dev, "release %pR (%s)\n", tmp, tmp->name); + + tmp->start = 0; + tmp->end = size - 1; + } + } +} + static void pci_bridge_release_resources(struct pci_bus *bus, unsigned long type) { @@ -1522,7 +1570,11 @@ static void pci_bridge_release_resources(struct pci_bus *bus, return; /* If there are children, release them all */ - release_child_resources(r); + if (pci_can_move_bars) + pci_release_child_resources(bus, r); + else + release_child_resources(r); + if (!release_resource(r)) { type = old_flags = r->flags & PCI_RES_TYPE_MASK; pci_info(dev, "resource %d %pR released\n",