From patchwork Mon Jan 25 08:49:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xu Yilun X-Patchwork-Id: 12045257 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-21.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12461C4332D for ; Tue, 26 Jan 2021 04:58:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EDB8D22D04 for ; Tue, 26 Jan 2021 04:58:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729900AbhAZE6O (ORCPT ); Mon, 25 Jan 2021 23:58:14 -0500 Received: from mga06.intel.com ([134.134.136.31]:13347 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726316AbhAYJUO (ORCPT ); Mon, 25 Jan 2021 04:20:14 -0500 IronPort-SDR: kVjbDa5jyErUlLo+DtGSkyKRo1EEQcomQnilysod0gXvOxXDa4jzEuRxyvUqDsVr2CQeFYxEhe 9BqD5cDMkoSg== X-IronPort-AV: E=McAfee;i="6000,8403,9874"; a="241224938" X-IronPort-AV: E=Sophos;i="5.79,373,1602572400"; d="scan'208";a="241224938" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jan 2021 00:53:50 -0800 IronPort-SDR: o5doBbkDT+8OCB50WofOLFXdGO1Rg8qqtTBZRxDg2MHmytxwbkXeZfzCv1B5cD+t7RiJSpWOhF tpgtQ61L7GJg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.79,373,1602572400"; d="scan'208";a="471979318" Received: from yilunxu-optiplex-7050.sh.intel.com ([10.239.159.141]) by fmsmga001.fm.intel.com with ESMTP; 25 Jan 2021 00:53:49 -0800 From: Xu Yilun To: gregkh@linuxfoundation.org, mdf@kernel.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org Cc: trix@redhat.com, lgoncalv@redhat.com, yilun.xu@intel.com, hao.wu@intel.com Subject: [PATCH v9 1/2] uio: uio_dfl: add userspace i/o driver for DFL bus Date: Mon, 25 Jan 2021 16:49:22 +0800 Message-Id: <1611564563-9665-2-git-send-email-yilun.xu@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1611564563-9665-1-git-send-email-yilun.xu@intel.com> References: <1611564563-9665-1-git-send-email-yilun.xu@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org This patch supports the DFL drivers be written in userspace. This is realized by exposing the userspace I/O device interfaces. The driver now only binds the ether group feature, which has no irq. So the irq support is not implemented yet. Signed-off-by: Xu Yilun --- v9: switch to add a uio driver in drivers/uio --- drivers/uio/Kconfig | 13 ++++++++++ drivers/uio/Makefile | 1 + drivers/uio/uio_dfl.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 80 insertions(+) create mode 100644 drivers/uio/uio_dfl.c diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig index 202ee81..44778f8 100644 --- a/drivers/uio/Kconfig +++ b/drivers/uio/Kconfig @@ -165,4 +165,17 @@ config UIO_HV_GENERIC to network and storage devices from userspace. If you compile this as a module, it will be called uio_hv_generic. + +config UIO_DFL + tristate "Generic driver for DFL bus" + depends on FPGA_DFL + help + Generic DFL (Device Feature List) driver for Userspace I/O devices. + It is useful to provide direct access to DFL devices from userspace. + A sample userspace application using this driver is available for + download in a git repository: + + git clone https://github.com/OPAE/opae-sdk.git + + If you compile this as a module, it will be called uio_dfl. endif diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile index c285dd2..f2f416a1 100644 --- a/drivers/uio/Makefile +++ b/drivers/uio/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_UIO_PRUSS) += uio_pruss.o obj-$(CONFIG_UIO_MF624) += uio_mf624.o obj-$(CONFIG_UIO_FSL_ELBC_GPCM) += uio_fsl_elbc_gpcm.o obj-$(CONFIG_UIO_HV_GENERIC) += uio_hv_generic.o +obj-$(CONFIG_UIO_DFL) += uio_dfl.o diff --git a/drivers/uio/uio_dfl.c b/drivers/uio/uio_dfl.c new file mode 100644 index 0000000..89c0fc7 --- /dev/null +++ b/drivers/uio/uio_dfl.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Generic DFL driver for Userspace I/O devicess + * + * Copyright (C) 2021 Intel Corporation, Inc. + */ +#include +#include +#include +#include + +#define DRIVER_NAME "uio_dfl" + +static int uio_dfl_probe(struct dfl_device *ddev) +{ + struct resource *r = &ddev->mmio_res; + struct device *dev = &ddev->dev; + struct uio_info *uioinfo; + struct uio_mem *uiomem; + int ret; + + uioinfo = devm_kzalloc(dev, sizeof(struct uio_info), GFP_KERNEL); + if (!uioinfo) + return -ENOMEM; + + uioinfo->name = DRIVER_NAME; + uioinfo->version = "0"; + + uiomem = &uioinfo->mem[0]; + uiomem->memtype = UIO_MEM_PHYS; + uiomem->addr = r->start & PAGE_MASK; + uiomem->offs = r->start & ~PAGE_MASK; + uiomem->size = (uiomem->offs + resource_size(r) + + PAGE_SIZE - 1) & PAGE_MASK; + uiomem->name = r->name; + + /* Irq is yet to be supported */ + uioinfo->irq = UIO_IRQ_NONE; + + ret = devm_uio_register_device(dev, uioinfo); + if (ret) + dev_err(dev, "unable to register uio device\n"); + + return ret; +} + +#define FME_FEATURE_ID_ETH_GROUP 0x10 + +static const struct dfl_device_id uio_dfl_ids[] = { + { FME_ID, FME_FEATURE_ID_ETH_GROUP }, + { } +}; +MODULE_DEVICE_TABLE(dfl, uio_dfl_ids); + +static struct dfl_driver uio_dfl_driver = { + .drv = { + .name = DRIVER_NAME, + }, + .id_table = uio_dfl_ids, + .probe = uio_dfl_probe, +}; +module_dfl_driver(uio_dfl_driver); + +MODULE_DESCRIPTION("Generic DFL driver for Userspace I/O devices"); +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL v2");