From patchwork Wed Jan 29 15:29:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 11356327 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 673FC14E3 for ; Wed, 29 Jan 2020 15:29:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 44D1D2173E for ; Wed, 29 Jan 2020 15:29:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yadro.com header.i=@yadro.com header.b="O7tFY6Ea" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726939AbgA2P3z (ORCPT ); Wed, 29 Jan 2020 10:29:55 -0500 Received: from mta-02.yadro.com ([89.207.88.252]:55764 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726913AbgA2P3z (ORCPT ); Wed, 29 Jan 2020 10:29:55 -0500 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 5849947616; Wed, 29 Jan 2020 15:29:54 +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= 1580311793; x=1582126194; bh=UV+sluQbKW5VDEjIsRiyd0/sF1OCV3U61py PBRhBXus=; b=O7tFY6EaOxSd0Je8jvpeZbfzGL0y/dVdBwKRArDJbyqSeD4FnYe z4ykBfFKV0w4yiKurbY3n7TXGiXG02F5XST3ivTimS/6B+Ad/2RbblbsFI/MyuFU dr3bXAn8iT4EnrGJ2MLoPS8dPZvfvBHlNTnnrKfcH5i7d1gA06MX9tsY= 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 ocaUymSUS9Xf; Wed, 29 Jan 2020 18:29:53 +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 0BEE547606; Wed, 29 Jan 2020 18:29:52 +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; Wed, 29 Jan 2020 18:29:50 +0300 From: Sergei Miroshnichenko To: CC: Bjorn Helgaas , Stefan Roese , , Sergei Miroshnichenko Subject: [PATCH v7 04/26] PCI: Add version of release_child_resources() aware of immovable BARs Date: Wed, 29 Jan 2020 18:29:15 +0300 Message-ID: <20200129152937.311162-5-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200129152937.311162-1-s.miroshnichenko@yadro.com> References: <20200129152937.311162-1-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 When using the release_child_resources() to release a bridge window, it drops the .start field of child's BARs to zero, but with the STARTALIGN flag remaining set, which makes this resource invalid for re-assignment. Immovable BARs must preserve their offset and size: those marked with the PCI_FIXED or 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: Sergei 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 f279826204eb..4c464430478f 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1500,6 +1500,54 @@ 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 BAR %d %pR (%s), keep its flags, base and size\n", + i, tmp, tmp->name); + continue; + } + + pci_dbg(dev, "release BAR %d %pR (%s)\n", i, tmp, tmp->name); + + tmp->start = 0; + tmp->end = size - 1; + } + } +} + static void pci_bridge_release_resources(struct pci_bus *bus, unsigned long type) { @@ -1540,7 +1588,11 @@ 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",