From patchwork Thu Jan 19 01:36:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhang, Tianfei" X-Patchwork-Id: 13107268 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 35F83C38159 for ; Thu, 19 Jan 2023 01:34:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229719AbjASBeU (ORCPT ); Wed, 18 Jan 2023 20:34:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230083AbjASBbQ (ORCPT ); Wed, 18 Jan 2023 20:31:16 -0500 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 457D26C56D; Wed, 18 Jan 2023 17:29:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674091759; x=1705627759; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Txos19R8DyvDzhERcj8uKGox4wLE09dcHL2zQgioezU=; b=mzbI3w4OcbcTydS5LbrNrf1WUybgd4bXfsssC0iDOCyf9EBupRSbEafO NwkCiguYwrqhU/hyMG1JXJpvNKV4o3TQi6CIboyhb4AbZE1aPJJtHAAAW RhA+IESmlmfDoZ+zjOM/OROXQWHliONfh7uO2uj6rEAAJwlNA3YwPmKmm qzVjCuPZ7/Y6aIxwaGgkrq8d1XS7p7H6wI9Is6Z3VjDebKgSCtDBbUgME NvKden6Ho+Kx4VFIGBqPmptk/lPAzhgNIEGBzM7HTyWW0xtIVyBFFTNvH +ekwmJF9sEqGt2a0tbEQ8r0nfl9327bP5i3EzSQwMyS4xtYggVjtzeHYu A==; X-IronPort-AV: E=McAfee;i="6500,9779,10594"; a="322847637" X-IronPort-AV: E=Sophos;i="5.97,226,1669104000"; d="scan'208";a="322847637" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jan 2023 17:29:13 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10594"; a="767995719" X-IronPort-AV: E=Sophos;i="5.97,226,1669104000"; d="scan'208";a="767995719" Received: from unknown (HELO fedora.sh.intel.com) ([10.238.175.104]) by fmsmga002.fm.intel.com with ESMTP; 18 Jan 2023 17:29:07 -0800 From: Tianfei Zhang To: bhelgaas@google.com, linux-pci@vger.kernel.org, linux-fpga@vger.kernel.org, lukas@wunner.de, kabel@kernel.org, mani@kernel.org, pali@kernel.org, mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com, trix@redhat.com, jgg@ziepe.ca, ira.weiny@intel.com, andriy.shevchenko@linux.intel.com, dan.j.williams@intel.com, keescook@chromium.org, rafael@kernel.org, russell.h.weight@intel.com, corbet@lwn.net, linux-doc@vger.kernel.org, ilpo.jarvinen@linux.intel.com, lee@kernel.org, gregkh@linuxfoundation.org, matthew.gerlach@linux.intel.com Cc: Tianfei Zhang Subject: [PATCH v1 12/12] Documentation: fpga: add description of fpgahp driver Date: Wed, 18 Jan 2023 20:36:02 -0500 Message-Id: <20230119013602.607466-13-tianfei.zhang@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230119013602.607466-1-tianfei.zhang@intel.com> References: <20230119013602.607466-1-tianfei.zhang@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add the description of fpgahp driver. Signed-off-by: Tianfei Zhang --- Documentation/fpga/fpgahp.rst | 29 +++++++++++++++++++++++++++++ Documentation/fpga/index.rst | 1 + MAINTAINERS | 1 + 3 files changed, 31 insertions(+) create mode 100644 Documentation/fpga/fpgahp.rst diff --git a/Documentation/fpga/fpgahp.rst b/Documentation/fpga/fpgahp.rst new file mode 100644 index 000000000000..3ec34bbffde1 --- /dev/null +++ b/Documentation/fpga/fpgahp.rst @@ -0,0 +1,29 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=========================== +FPGA Hotplug Manager Driver +=========================== + +Authors: + +- Tianfei Zhang + +There are some board managements for PCIe-based FPGA card like burning the entire +image, loading a new FPGA image or BMC firmware in FPGA deployment of data center +or cloud. For example, loading a new FPGA image, the driver needs to remove all of +PCI devices like PFs/VFs and as well as any other types of devices (platform, etc.) +defined within the FPGA. After triggering the image load of the FPGA card via BMC, +the driver reconfigures the PCI bus. The FPGA Hotplug Manager (fpgahp) driver manages +those devices and functions leveraging the PCI hotplug framework to deal with the +reconfiguration of the PCI bus and removal/probe of PCI devices below the FPGA card. + +This fpgahp driver adds 2 new callbacks to extend the hotplug mechanism to +allow selecting and loading a new FPGA image. + + - available_images: Optional: called to return the available images of a FPGA card. + - image_load: Optional: called to load a new image for a FPGA card. + +In general, the fpgahp driver provides some sysfs files:: + + /sys/bus/pci/slots//available_images + /sys/bus/pci/slots//image_load diff --git a/Documentation/fpga/index.rst b/Documentation/fpga/index.rst index f80f95667ca2..8973a8a3f066 100644 --- a/Documentation/fpga/index.rst +++ b/Documentation/fpga/index.rst @@ -8,6 +8,7 @@ fpga :maxdepth: 1 dfl + fpgahp .. only:: subproject and html diff --git a/MAINTAINERS b/MAINTAINERS index 85d4e3a0e986..569c7f680229 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -8169,6 +8169,7 @@ L: linux-fpga@vger.kernel.org L: linux-pci@vger.kernel.org S: Maintained F: Documentation/ABI/testing/sysfs-driver-fpgahp +F: Documentation/fpga/fpgahp.rst F: drivers/pci/hotplug/fpgahp.c F: include/linux/fpga/fpgahp_manager.h