From patchwork Mon Mar 11 13:31:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Miroshnichenko X-Patchwork-Id: 10847471 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 64FFB1669 for ; Mon, 11 Mar 2019 13:32:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C6C62290D1 for ; Mon, 11 Mar 2019 13:31:45 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C52752948E; Mon, 11 Mar 2019 13:31:45 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 54043290D1 for ; Mon, 11 Mar 2019 13:31:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727553AbfCKNbo (ORCPT ); Mon, 11 Mar 2019 09:31:44 -0400 Received: from mta-01.yadro.com ([89.207.88.251]:50964 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727673AbfCKNbo (ORCPT ); Mon, 11 Mar 2019 09:31:44 -0400 Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id 380A841980; Mon, 11 Mar 2019 13:31:42 +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= 1552311096; x=1554125497; bh=XcwuVqHempHAfwnox4/GHtbL1ImHCqBJfQJ RZzsuR4Q=; b=NsikD/q4CliFskFoKcpmrSW5mL9XkZLJh8IM9qo+0MEhCtiEPn0 W/zxAuOcVM38/yo8eCHAV9fXX5Vq9PIOBBB5T/OsfcDfc+9AZjaY+CYagc5atDoH azVKdWWQ9VqkwXYHuRMrjcCrGN6Cq08smKk0BPpMK+Se3jnA9TOOrNBc= 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 NRQ7k-twhriP; Mon, 11 Mar 2019 16:31:36 +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 A13C7419DD; Mon, 11 Mar 2019 16:31:32 +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; Mon, 11 Mar 2019 16:31:32 +0300 From: Sergey Miroshnichenko To: , CC: Bjorn Helgaas , , Sergey Miroshnichenko Subject: [PATCH RFC v4 11/21] PCI: Release and reassign the root bridge resources during rescan Date: Mon, 11 Mar 2019 16:31:12 +0300 Message-ID: <20190311133122.11417-12-s.miroshnichenko@yadro.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190311133122.11417-1-s.miroshnichenko@yadro.com> References: <20190311133122.11417-1-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) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When the movable BARs feature is enabled, don't rely on the memory gaps reserved by the BIOS/bootloader/firmware, but instead rearrange the BARs and bridge windows starting from the root. Endpoint device's BARs, after being released, are resorted and written back by the pci_assign_unassigned_root_bus_resources(). The last step of writing the recalculated windows to the bridges is done by the new pci_setup_bridges() function. Signed-off-by: Sergey Miroshnichenko --- drivers/pci/pci.h | 1 + drivers/pci/probe.c | 22 ++++++++++++++++++++++ drivers/pci/setup-bus.c | 11 ++++++++++- 3 files changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 224d88634115..e06e8692a7b1 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -248,6 +248,7 @@ void __pci_bus_assign_resources(const struct pci_bus *bus, struct list_head *realloc_head, struct list_head *fail_head); bool pci_bus_clip_resource(struct pci_dev *dev, int idx); +void pci_bus_release_root_bridge_resources(struct pci_bus *bus); void pci_reassigndev_resource_alignment(struct pci_dev *dev); void pci_disable_bridge_window(struct pci_dev *dev); diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 1cf6ec960236..692752c71f71 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -3299,6 +3299,25 @@ static void pci_bus_rescan_done(struct pci_bus *bus) pm_runtime_put(&bus->dev); } +static void pci_setup_bridges(struct pci_bus *bus) +{ + struct pci_dev *dev; + + list_for_each_entry(dev, &bus->devices, bus_list) { + struct pci_bus *child; + + if (!pci_dev_is_added(dev) || pci_dev_is_ignored(dev)) + continue; + + child = dev->subordinate; + if (child) + pci_setup_bridges(child); + } + + if (bus->self) + pci_setup_bridge(bus); +} + /** * pci_rescan_bus - Scan a PCI bus for devices * @bus: PCI bus to scan @@ -3321,8 +3340,11 @@ unsigned int pci_rescan_bus(struct pci_bus *bus) pci_bus_rescan_prepare(root); max = pci_scan_child_bus(root); + + pci_bus_release_root_bridge_resources(root); pci_assign_unassigned_root_bus_resources(root); + pci_setup_bridges(root); pci_bus_rescan_done(root); } else { max = pci_scan_child_bus(bus); diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index be7d4e6d7b65..36a1907d9509 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1584,7 +1584,7 @@ static void pci_bridge_release_resources(struct pci_bus *bus, pci_printk(KERN_DEBUG, dev, "resource %d %pR released\n", PCI_BRIDGE_RESOURCES + idx, r); /* keep the old size */ - r->end = resource_size(r) - 1; + r->end = pci_movable_bars_enabled() ? 0 : (resource_size(r) - 1); r->start = 0; r->flags = 0; @@ -1637,6 +1637,15 @@ static void pci_bus_release_bridge_resources(struct pci_bus *bus, pci_bridge_release_resources(bus, type); } +void pci_bus_release_root_bridge_resources(struct pci_bus *root_bus) +{ + pci_bus_release_bridge_resources(root_bus, IORESOURCE_IO, whole_subtree); + pci_bus_release_bridge_resources(root_bus, IORESOURCE_MEM, whole_subtree); + pci_bus_release_bridge_resources(root_bus, + IORESOURCE_MEM_64 | IORESOURCE_PREFETCH, + whole_subtree); +} + static void pci_bus_dump_res(struct pci_bus *bus) { struct resource *res;