From patchwork Fri Aug 16 16:50:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 1148377 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4699D55Tzrz9sML for ; Sat, 17 Aug 2019 03:24:21 +1000 (AEST) 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="tEvbMbHo"; dkim-atps=neutral Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4699D515jJzDqbF for ; Sat, 17 Aug 2019 03:24:21 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=yadro.com (client-ip=89.207.88.252; helo=mta-01.yadro.com; envelope-from=s.miroshnichenko@yadro.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=yadro.com Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=yadro.com header.i=@yadro.com header.b="tEvbMbHo"; dkim-atps=neutral Received: from mta-01.yadro.com (mta-02.yadro.com [89.207.88.252]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4698V10QxRzDqHw for ; Sat, 17 Aug 2019 02:51:21 +1000 (AEST) Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 3352C412D2; Fri, 16 Aug 2019 16:51:18 +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= 1565974277; x=1567788678; bh=swwKzQYGh9YSSjQQfhDacDugfFrMT6V0xQl ayHGhLMw=; b=tEvbMbHo+vJYvoS97X4u15tA+W0IFZxYzEz5GUvf/BYDZ4wyVJb G1DcqLtO8NBU9pkOion1dtKh3GFIUqryJxjf7lMRlwRy9Uv+Av+NzkW98zAUwlZ9 QR1Nc+rJzDlVRCeqO9UzG75dSwGdvvQ1CZN09RFzr3ILg+Che4mpgiSw= 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 N864T8qmIiN1; Fri, 16 Aug 2019 19:51:17 +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 8CE8042ED9; Fri, 16 Aug 2019 19:51:11 +0300 (MSK) Received: from NB-148.yadro.com (172.17.15.60) 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; Fri, 16 Aug 2019 19:51:11 +0300 From: Sergey Miroshnichenko To: , Subject: [PATCH v5 13/23] PCI: Make sure bridge windows include their fixed BARs Date: Fri, 16 Aug 2019 19:50:51 +0300 Message-ID: <20190816165101.911-14-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190816165101.911-1-s.miroshnichenko@yadro.com> References: <20190816165101.911-1-s.miroshnichenko@yadro.com> MIME-Version: 1.0 X-Originating-IP: [172.17.15.60] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sergey Miroshnichenko , Bjorn Helgaas , linux@yadro.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" When the time comes to select a start address for the bridge window during the root bus rescan, it should be not just a lowest possible address: this window must cover all the underlying fixed and immovable BARs. The lowest address that satisfies this requirement is the .realloc_range field of struct pci_bus, which is calculated during the preparation to the rescan. Signed-off-by: Sergey Miroshnichenko --- drivers/pci/bus.c | 2 +- drivers/pci/setup-res.c | 28 ++++++++++++++++++++++++++-- 2 files changed, 27 insertions(+), 3 deletions(-) diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 495059d923f7..7aae830751e9 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -192,7 +192,7 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res, * this is an already-configured bridge window, its start * overrides "min". */ - if (avail.start) + if (min_used < avail.start) min_used = avail.start; max = avail.end; diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 732d18f60f1b..7357bcc12a53 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -248,9 +248,20 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, struct resource *res = dev->resource + resno; resource_size_t min; int ret; + resource_size_t start = (resource_size_t)-1; + resource_size_t end = 0; min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; + if (dev->subordinate && resno >= PCI_BRIDGE_RESOURCES) { + struct pci_bus *child_bus = dev->subordinate; + int b_resno = resno - PCI_BRIDGE_RESOURCES; + struct resource *immovable_range = &child_bus->immovable_range[b_resno]; + + if (immovable_range->start < immovable_range->end) + min = child_bus->realloc_range[b_resno].start; + } + /* * First, try exact prefetching match. Even if a 64-bit * prefetchable bridge window is below 4GB, we can't put a 32-bit @@ -262,7 +273,7 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, IORESOURCE_PREFETCH | IORESOURCE_MEM_64, pcibios_align_resource, dev); if (ret == 0) - return 0; + goto check_fixed; /* * If the prefetchable window is only 32 bits wide, we can put @@ -274,7 +285,7 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, IORESOURCE_PREFETCH, pcibios_align_resource, dev); if (ret == 0) - return 0; + goto check_fixed; } /* @@ -287,6 +298,19 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, pcibios_align_resource, dev); +check_fixed: + if (ret == 0 && start < end) { + if (res->start > start || res->end < end) { + dev_err(&bus->dev, "fixed area 0x%llx-0x%llx for %s doesn't fit in the allocated %pR (0x%llx-0x%llx)", + (unsigned long long)start, (unsigned long long)end, + dev_name(&dev->dev), + res, (unsigned long long)res->start, + (unsigned long long)res->end); + release_resource(res); + return -1; + } + } + return ret; }