From patchwork Thu Jun 15 20:37:21 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 9790249 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.web.codeaurora.org (Postfix) with ESMTP id 9B6686038E for ; Thu, 15 Jun 2017 20:40:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8F9602863B for ; Thu, 15 Jun 2017 20:40:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 846E52863A; Thu, 15 Jun 2017 20:40:59 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable 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 1835428634 for ; Thu, 15 Jun 2017 20:40:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752629AbdFOUkh (ORCPT ); Thu, 15 Jun 2017 16:40:37 -0400 Received: from ale.deltatee.com ([207.54.116.67]:58904 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751795AbdFOUhp (ORCPT ); Thu, 15 Jun 2017 16:37:45 -0400 Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from ) id 1dLbWI-0007qR-8X; Thu, 15 Jun 2017 14:37:38 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.84_2) (envelope-from ) id 1dLbWM-0002Ma-DZ; Thu, 15 Jun 2017 14:37:38 -0600 From: Logan Gunthorpe To: linux-ntb@googlegroups.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jon Mason , Dave Jiang , Allen Hubbe , Bjorn Helgaas , Greg Kroah-Hartman , Kurt Schwemmer , Stephen Bates , Logan Gunthorpe Date: Thu, 15 Jun 2017 14:37:21 -0600 Message-Id: <20170615203729.9009-6-logang@deltatee.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170615203729.9009-1-logang@deltatee.com> References: <20170615203729.9009-1-logang@deltatee.com> X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-ntb@googlegroups.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, jdmason@kudzu.us, dave.jiang@intel.com, Allen.Hubbe@emc.com, bhelgaas@google.com, gregkh@linuxfoundation.org, kurt.schwemmer@microsemi.com, sbates@raithlin.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [RFC PATCH 05/13] switchtec_ntb: introduce initial ntb driver X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) 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 Seeing the switchtec NTB hardware shares the same endpoint as the management endpoint we utilize the class_interface api to register an NTB driver for every switchtec device in the system that has the NTB class code. Signed-off-by: Logan Gunthorpe Reviewed-by: Stephen Bates Reviewed-by: Kurt Schwemmer --- MAINTAINERS | 1 + drivers/ntb/hw/Kconfig | 1 + drivers/ntb/hw/Makefile | 1 + drivers/ntb/hw/mscc/Kconfig | 9 +++++ drivers/ntb/hw/mscc/Makefile | 1 + drivers/ntb/hw/mscc/switchtec_ntb.c | 81 +++++++++++++++++++++++++++++++++++++ include/linux/switchtec.h | 4 ++ 7 files changed, 98 insertions(+) create mode 100644 drivers/ntb/hw/mscc/Kconfig create mode 100644 drivers/ntb/hw/mscc/Makefile create mode 100644 drivers/ntb/hw/mscc/switchtec_ntb.c diff --git a/MAINTAINERS b/MAINTAINERS index 6cee5e253ec3..fbd88be1be03 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -9842,6 +9842,7 @@ F: Documentation/ABI/testing/sysfs-class-switchtec F: drivers/pci/switch/switchtec* F: include/uapi/linux/switchtec_ioctl.h F: include/linux/switchtec.h +F: drivers/ntb/hw/mscc/ PCI DRIVER FOR NVIDIA TEGRA M: Thierry Reding diff --git a/drivers/ntb/hw/Kconfig b/drivers/ntb/hw/Kconfig index 7116472b4625..1d1360db87e1 100644 --- a/drivers/ntb/hw/Kconfig +++ b/drivers/ntb/hw/Kconfig @@ -1,2 +1,3 @@ source "drivers/ntb/hw/amd/Kconfig" source "drivers/ntb/hw/intel/Kconfig" +source "drivers/ntb/hw/mscc/Kconfig" diff --git a/drivers/ntb/hw/Makefile b/drivers/ntb/hw/Makefile index 532e0859b4a1..690c00274174 100644 --- a/drivers/ntb/hw/Makefile +++ b/drivers/ntb/hw/Makefile @@ -1,2 +1,3 @@ obj-$(CONFIG_NTB_AMD) += amd/ obj-$(CONFIG_NTB_INTEL) += intel/ +obj-$(CONFIG_NTB_SWITCHTEC) += mscc/ diff --git a/drivers/ntb/hw/mscc/Kconfig b/drivers/ntb/hw/mscc/Kconfig new file mode 100644 index 000000000000..013ed6716438 --- /dev/null +++ b/drivers/ntb/hw/mscc/Kconfig @@ -0,0 +1,9 @@ +config NTB_SWITCHTEC + tristate "MicroSemi Switchtec Non-Transparent Bridge Support" + select PCI_SW_SWITCHTEC + help + Enables NTB support for Switchtec PCI switches. This also + selects the Switchtec management driver as they share the same + hardware interface. + + If unsure, say N. diff --git a/drivers/ntb/hw/mscc/Makefile b/drivers/ntb/hw/mscc/Makefile new file mode 100644 index 000000000000..21907b364e19 --- /dev/null +++ b/drivers/ntb/hw/mscc/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_NTB_SWITCHTEC) += switchtec_ntb.o diff --git a/drivers/ntb/hw/mscc/switchtec_ntb.c b/drivers/ntb/hw/mscc/switchtec_ntb.c new file mode 100644 index 000000000000..1f094216aa1c --- /dev/null +++ b/drivers/ntb/hw/mscc/switchtec_ntb.c @@ -0,0 +1,81 @@ +/* + * Microsemi Switchtec(tm) PCIe Management Driver + * Copyright (c) 2017, Microsemi Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + */ + +#include +#include + +MODULE_DESCRIPTION("Microsemi Switchtec(tm) NTB Driver"); +MODULE_VERSION("0.1"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Microsemi Corporation"); + +struct switchtec_ntb { + struct switchtec_dev *stdev; +}; + +static int switchtec_ntb_add(struct device *dev, + struct class_interface *class_intf) +{ + struct switchtec_dev *stdev = to_stdev(dev); + struct switchtec_ntb *sndev; + + stdev->sndev = NULL; + + if (stdev->pdev->class != MICROSEMI_NTB_CLASSCODE) + return -ENODEV; + + sndev = kzalloc_node(sizeof(*sndev), GFP_KERNEL, dev_to_node(dev)); + if (!sndev) + return -ENOMEM; + + sndev->stdev = stdev; + + stdev->sndev = sndev; + dev_info(dev, "NTB device registered"); + + return 0; +} + +void switchtec_ntb_remove(struct device *dev, + struct class_interface *class_intf) +{ + struct switchtec_dev *stdev = to_stdev(dev); + struct switchtec_ntb *sndev = stdev->sndev; + + if (!sndev) + return; + + stdev->sndev = NULL; + kfree(sndev); + dev_info(dev, "ntb device unregistered"); +} + +static struct class_interface switchtec_interface = { + .class = &switchtec_class, + .add_dev = switchtec_ntb_add, + .remove_dev = switchtec_ntb_remove, +}; + +static int __init switchtec_ntb_init(void) +{ + return class_interface_register(&switchtec_interface); +} +module_init(switchtec_ntb_init); + +static void __exit switchtec_ntb_exit(void) +{ + class_interface_unregister(&switchtec_interface); +} +module_exit(switchtec_ntb_exit); diff --git a/include/linux/switchtec.h b/include/linux/switchtec.h index 8d66a0659cef..0a7d0ed77507 100644 --- a/include/linux/switchtec.h +++ b/include/linux/switchtec.h @@ -312,6 +312,8 @@ struct pff_csr_regs { u32 reserved4[174]; } __packed; +struct switchtec_ntb; + struct switchtec_dev { struct pci_dev *pdev; struct device dev; @@ -349,6 +351,8 @@ struct switchtec_dev { struct work_struct link_event_work; struct blocking_notifier_head link_notifier; u8 link_event_count[SWITCHTEC_MAX_PFF_CSR]; + + struct switchtec_ntb *sndev; }; static inline struct switchtec_dev *to_stdev(struct device *dev)