From patchwork Thu Dec 3 21:09:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 11949603 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 6F424C4361B for ; Thu, 3 Dec 2020 21:11:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 25CA82223E for ; Thu, 3 Dec 2020 21:11:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728613AbgLCVLW (ORCPT ); Thu, 3 Dec 2020 16:11:22 -0500 Received: from mga11.intel.com ([192.55.52.93]:57306 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725885AbgLCVLW (ORCPT ); Thu, 3 Dec 2020 16:11:22 -0500 IronPort-SDR: 3Exn8CKZe4dNZTH+ei0l0KUKlsJoLmsfj2fdW5oY4VEpnc64kLuc+wdXmVkK4KanQEfy4AZefa rqWOinoyzclA== X-IronPort-AV: E=McAfee;i="6000,8403,9824"; a="169773016" X-IronPort-AV: E=Sophos;i="5.78,390,1599548400"; d="scan'208";a="169773016" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Dec 2020 13:10:02 -0800 IronPort-SDR: DtGWkLFQdBxkVj8nLbtSSSP3EJgcNjGUPdz2xD4i4ZsBUr+rGZ9vXe2mTu0vpkyXBDruvOnx47 3C3RW1CSMDDw== X-IronPort-AV: E=Sophos;i="5.78,390,1599548400"; d="scan'208";a="330971719" Received: from rhweight-mobl2.amr.corp.intel.com (HELO rhweight-mobl2.ra.intel.com) ([10.251.23.110]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Dec 2020 13:10:02 -0800 From: Russ Weight To: 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, matthew.gerlach@intel.com, Russ Weight Subject: [PATCH v7 3/7] fpga: sec-mgr: expose sec-mgr update status Date: Thu, 3 Dec 2020 13:09:54 -0800 Message-Id: <20201203210958.241329-4-russell.h.weight@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201203210958.241329-1-russell.h.weight@intel.com> References: <20201203210958.241329-1-russell.h.weight@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Extend the FPGA Security Manager class driver to include an update/status sysfs node that can be polled and read to monitor the progress of an ongoing secure update. Sysfs_notify() is used to signal transitions between different phases of the update process. Signed-off-by: Russ Weight Reviewed-by: Tom Rix --- v7: - Changed Date in documentation file to December 2020 v6: - No change v5: - Use new function sysfs_emit() in the status_show() function v4: - Changed from "Intel FPGA Security Manager" to FPGA Security Manager" and removed unnecessary references to "Intel". - Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_ v3: - Use a local variable to read progress once in status_show() - Use dev_err to report invalid progress status v2: - Bumped documentation date and version - Changed progress state "read_file" to "reading" --- .../ABI/testing/sysfs-class-fpga-sec-mgr | 11 +++++ drivers/fpga/fpga-sec-mgr.c | 42 +++++++++++++++++-- 2 files changed, 49 insertions(+), 4 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr index e9334f986380..d3be25d63a08 100644 --- a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr +++ b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr @@ -16,3 +16,14 @@ Description: Write only. Write the filename of an image BMC images, BMC firmware, Static Region images, and Root Entry Hashes, and to cancel Code Signing Keys (CSK). + +What: /sys/class/fpga_sec_mgr/fpga_secX/update/status +Date: December 2020 +KernelVersion: 5.11 +Contact: Russ Weight +Description: Read-only. Returns a string describing the current + status of an update. The string will be one of the + following: idle, reading, preparing, writing, + programming. Userspace code can poll on this file, + as it will be signaled by sysfs_notify() on each + state change. diff --git a/drivers/fpga/fpga-sec-mgr.c b/drivers/fpga/fpga-sec-mgr.c index 7347ba1ba73e..dd60014b7511 100644 --- a/drivers/fpga/fpga-sec-mgr.c +++ b/drivers/fpga/fpga-sec-mgr.c @@ -25,6 +25,13 @@ struct fpga_sec_mgr_devres { #define to_sec_mgr(d) container_of(d, struct fpga_sec_mgr, dev) +static void update_progress(struct fpga_sec_mgr *smgr, + enum fpga_sec_prog new_progress) +{ + smgr->progress = new_progress; + sysfs_notify(&smgr->dev.kobj, "update", "status"); +} + static void fpga_sec_dev_error(struct fpga_sec_mgr *smgr, enum fpga_sec_err err_code) { @@ -35,7 +42,7 @@ static void fpga_sec_dev_error(struct fpga_sec_mgr *smgr, static void progress_complete(struct fpga_sec_mgr *smgr) { mutex_lock(&smgr->lock); - smgr->progress = FPGA_SEC_PROG_IDLE; + update_progress(smgr, FPGA_SEC_PROG_IDLE); complete_all(&smgr->update_done); mutex_unlock(&smgr->lock); } @@ -63,14 +70,14 @@ static void fpga_sec_mgr_update(struct work_struct *work) goto release_fw_exit; } - smgr->progress = FPGA_SEC_PROG_PREPARING; + update_progress(smgr, FPGA_SEC_PROG_PREPARING); ret = smgr->sops->prepare(smgr); if (ret != FPGA_SEC_ERR_NONE) { fpga_sec_dev_error(smgr, ret); goto modput_exit; } - smgr->progress = FPGA_SEC_PROG_WRITING; + update_progress(smgr, FPGA_SEC_PROG_WRITING); size = smgr->remaining_size; while (size) { blk_size = min_t(u32, size, WRITE_BLOCK_SIZE); @@ -85,7 +92,7 @@ static void fpga_sec_mgr_update(struct work_struct *work) offset += blk_size; } - smgr->progress = FPGA_SEC_PROG_PROGRAMMING; + update_progress(smgr, FPGA_SEC_PROG_PROGRAMMING); ret = smgr->sops->poll_complete(smgr); if (ret != FPGA_SEC_ERR_NONE) fpga_sec_dev_error(smgr, ret); @@ -113,6 +120,32 @@ static void fpga_sec_mgr_update(struct work_struct *work) progress_complete(smgr); } +static const char * const sec_mgr_prog_str[] = { + "idle", /* FPGA_SEC_PROG_IDLE */ + "reading", /* FPGA_SEC_PROG_READING */ + "preparing", /* FPGA_SEC_PROG_PREPARING */ + "writing", /* FPGA_SEC_PROG_WRITING */ + "programming" /* FPGA_SEC_PROG_PROGRAMMING */ +}; + +static ssize_t +status_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct fpga_sec_mgr *smgr = to_sec_mgr(dev); + const char *status = "unknown-status"; + enum fpga_sec_prog progress; + + progress = smgr->progress; + if (progress < FPGA_SEC_PROG_MAX) + status = sec_mgr_prog_str[progress]; + else + dev_err(dev, "Invalid status during secure update: %d\n", + progress); + + return sysfs_emit(buf, "%s\n", status); +} +static DEVICE_ATTR_RO(status); + static ssize_t filename_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { @@ -147,6 +180,7 @@ static DEVICE_ATTR_WO(filename); static struct attribute *sec_mgr_update_attrs[] = { &dev_attr_filename.attr, + &dev_attr_status.attr, NULL, };