From patchwork Fri Mar 9 19:00:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Helgaas X-Patchwork-Id: 883935 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 (mailfrom) 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=none (p=none dis=none) header.from=kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3zycFg1rDTz9sft for ; Sat, 10 Mar 2018 06:02:31 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932734AbeCITAZ (ORCPT ); Fri, 9 Mar 2018 14:00:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:40842 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932370AbeCITAX (ORCPT ); Fri, 9 Mar 2018 14:00:23 -0500 Received: from localhost (unknown [104.132.51.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4100F2178E; Fri, 9 Mar 2018 19:00:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4100F2178E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=helgaas@kernel.org Subject: [PATCH v2 06/13] PCI/portdrv: Remove pcie_port_bus_type link order dependency From: Bjorn Helgaas To: linux-pci@vger.kernel.org Cc: linux-kernel@vger.kernel.org, "Rafael J. Wysocki" , linux-pm@vger.kernel.org, Keith Busch , Sinan Kaya , Lukas Wunner , Frederick Lawler Date: Fri, 09 Mar 2018 13:00:22 -0600 Message-ID: <152062202196.77693.13201322126291517429.stgit@bhelgaas-glaptop.roam.corp.google.com> In-Reply-To: <152062141493.77693.9630397416694091342.stgit@bhelgaas-glaptop.roam.corp.google.com> References: <152062141493.77693.9630397416694091342.stgit@bhelgaas-glaptop.roam.corp.google.com> User-Agent: StGit/0.18 MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Bjorn Helgaas The pcie_port_bus_type must be registered before drivers that depend on it can be registered. Those drivers include: pcied_init() # PCIe native hotplug driver aer_service_init() # AER driver dpc_service_init() # DPC driver pcie_pme_service_init() # PME driver Previously we registered pcie_port_bus_type from pcie_portdrv_init(), a device_initcall. The callers of pcie_port_service_register() (above) are also device_initcalls. This is fragile because the device_initcall ordering depends on link order, which is not explicit. Register pcie_port_bus_type from pci_driver_init() along with pci_bus_type. This removes the link order dependency between portdrv and the pciehp, AER, DPC, and PCIe PME drivers. Signed-off-by: Bjorn Helgaas Reviewed-by: Rafael J. Wysocki Reviewed-by: Christoph Hellwig --- drivers/pci/pci-driver.c | 44 +++++++++++++++++++++++++++++++- drivers/pci/pcie/Makefile | 2 + drivers/pci/pcie/portdrv_bus.c | 55 ---------------------------------------- drivers/pci/pcie/portdrv_pci.c | 13 +-------- 4 files changed, 45 insertions(+), 69 deletions(-) delete mode 100644 drivers/pci/pcie/portdrv_bus.c diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 204d2b54c2a4..02ecbdafe38b 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -19,6 +19,7 @@ #include #include #include "pci.h" +#include "pcie/portdrv.h" struct pci_dynid { struct list_head node; @@ -1553,8 +1554,49 @@ struct bus_type pci_bus_type = { }; EXPORT_SYMBOL(pci_bus_type); +#ifdef CONFIG_PCIEPORTBUS +static int pcie_port_bus_match(struct device *dev, struct device_driver *drv) +{ + struct pcie_device *pciedev; + struct pcie_port_service_driver *driver; + + if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type) + return 0; + + pciedev = to_pcie_device(dev); + driver = to_service_driver(drv); + + if (driver->service != pciedev->service) + return 0; + + if ((driver->port_type != PCIE_ANY_PORT) && + (driver->port_type != pci_pcie_type(pciedev->port))) + return 0; + + return 1; +} + +struct bus_type pcie_port_bus_type = { + .name = "pci_express", + .match = pcie_port_bus_match, +}; +EXPORT_SYMBOL_GPL(pcie_port_bus_type); +#endif + static int __init pci_driver_init(void) { - return bus_register(&pci_bus_type); + int ret; + + ret = bus_register(&pci_bus_type); + if (ret) + return ret; + +#ifdef CONFIG_PCIEPORTBUS + ret = bus_register(&pcie_port_bus_type); + if (ret) + return ret; +#endif + + return 0; } postcore_initcall(pci_driver_init); diff --git a/drivers/pci/pcie/Makefile b/drivers/pci/pcie/Makefile index 223e4c34c29a..e01c10c97b95 100644 --- a/drivers/pci/pcie/Makefile +++ b/drivers/pci/pcie/Makefile @@ -6,7 +6,7 @@ # Build PCI Express ASPM if needed obj-$(CONFIG_PCIEASPM) += aspm.o -pcieportdrv-y := portdrv_core.o portdrv_pci.o portdrv_bus.o +pcieportdrv-y := portdrv_core.o portdrv_pci.o pcieportdrv-$(CONFIG_ACPI) += portdrv_acpi.o obj-$(CONFIG_PCIEPORTBUS) += pcieportdrv.o diff --git a/drivers/pci/pcie/portdrv_bus.c b/drivers/pci/pcie/portdrv_bus.c deleted file mode 100644 index 4969ccf6b214..000000000000 --- a/drivers/pci/pcie/portdrv_bus.c +++ /dev/null @@ -1,55 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * File: portdrv_bus.c - * Purpose: PCI Express Port Bus Driver's Bus Overloading Functions - * - * Copyright (C) 2004 Intel - * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) - */ - -#include -#include -#include -#include -#include - -#include "portdrv.h" - -static int pcie_port_bus_match(struct device *dev, struct device_driver *drv); - -struct bus_type pcie_port_bus_type = { - .name = "pci_express", - .match = pcie_port_bus_match, -}; -EXPORT_SYMBOL_GPL(pcie_port_bus_type); - -static int pcie_port_bus_match(struct device *dev, struct device_driver *drv) -{ - struct pcie_device *pciedev; - struct pcie_port_service_driver *driver; - - if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type) - return 0; - - pciedev = to_pcie_device(dev); - driver = to_service_driver(drv); - - if (driver->service != pciedev->service) - return 0; - - if ((driver->port_type != PCIE_ANY_PORT) && - (driver->port_type != pci_pcie_type(pciedev->port))) - return 0; - - return 1; -} - -int pcie_port_bus_register(void) -{ - return bus_register(&pcie_port_bus_type); -} - -void pcie_port_bus_unregister(void) -{ - bus_unregister(&pcie_port_bus_type); -} diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c index 5d9d5305ebef..127321e17184 100644 --- a/drivers/pci/pcie/portdrv_pci.c +++ b/drivers/pci/pcie/portdrv_pci.c @@ -258,22 +258,11 @@ static const struct dmi_system_id pcie_portdrv_dmi_table[] __initconst = { static int __init pcie_portdrv_init(void) { - int retval; - if (pcie_ports_disabled) return -EACCES; dmi_check_system(pcie_portdrv_dmi_table); - retval = pcie_port_bus_register(); - if (retval) { - printk(KERN_WARNING "PCIE: bus_register error: %d\n", retval); - goto out; - } - retval = pci_register_driver(&pcie_portdriver); - if (retval) - pcie_port_bus_unregister(); - out: - return retval; + return pci_register_driver(&pcie_portdriver); } device_initcall(pcie_portdrv_init);