From patchwork Thu Dec 3 21:09:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 11949611 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 2CA35C0007A for ; Thu, 3 Dec 2020 21:12:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D4B0E22225 for ; Thu, 3 Dec 2020 21:11:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729580AbgLCVLp (ORCPT ); Thu, 3 Dec 2020 16:11:45 -0500 Received: from mga11.intel.com ([192.55.52.93]:57209 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728312AbgLCVLp (ORCPT ); Thu, 3 Dec 2020 16:11:45 -0500 IronPort-SDR: NiARvOgoCel5E8bHXWN/MscqMq5hlGNFooTgfSYD90BiA43wfCPkzARhRnZF7FPJJm45Gpql9I igOw6Yn76xIQ== X-IronPort-AV: E=McAfee;i="6000,8403,9824"; a="169773026" X-IronPort-AV: E=Sophos;i="5.78,390,1599548400"; d="scan'208";a="169773026" 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 13:10:04 -0800 IronPort-SDR: r6xf39njFsBxFY2BekDOH8q5JxTa/J7b2Xwzj4qevRaFkyjWjNNcCwjac+XK6Y2J7k57KXUr/I mohsjDIn+VTg== X-IronPort-AV: E=Sophos;i="5.78,390,1599548400"; d="scan'208";a="330971750" 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 13:10:04 -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 7/7] fpga: sec-mgr: expose hardware error info Date: Thu, 3 Dec 2020 13:09:58 -0800 Message-Id: <20201203210958.241329-8-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 optional update/hw_errinfo sysfs node that can be used to retrieve 64 bits of device specific error information following a secure update failure. The underlying driver must provide a get_hw_errinfo() callback function to enable this feature. This data is treated as opaque by the class driver. It is left to user-space software or support personnel to interpret this data. Signed-off-by: Russ Weight Reviewed-by: Tom Rix --- v7: - Changed Date in documentation file to December 2020 v6: - No change v5: - No change 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: - No change v2: - Bumped documentation date and version --- .../ABI/testing/sysfs-class-fpga-sec-mgr | 14 +++++++ drivers/fpga/fpga-sec-mgr.c | 38 +++++++++++++++++++ include/linux/fpga/fpga-sec-mgr.h | 5 +++ 3 files changed, 57 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr index 96694f229aff..448651909dc6 100644 --- a/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr +++ b/Documentation/ABI/testing/sysfs-class-fpga-sec-mgr @@ -65,3 +65,17 @@ Description: Read-only. Returns a string describing the failure idle state. If this file is read while a secure update is in progress, then the read will fail with EBUSY. + +What: /sys/class/fpga_sec_mgr/fpga_secX/update/hw_errinfo +Date: December 2020 +KernelVersion: 5.11 +Contact: Russ Weight +Description: Read-only. Returns a 64 bit error value providing + hardware specific information that may be useful in + debugging errors that occur during FPGA image updates. + This file is only visible if the underlying device + supports it. The hw_errinfo value is only accessible + when the secure update engine is in the idle state. + If this file is read while a secure update is in + progress, then the read will fail with EBUSY. + Format: "0x%llx". diff --git a/drivers/fpga/fpga-sec-mgr.c b/drivers/fpga/fpga-sec-mgr.c index d354fe2ab582..aebe06d9a54a 100644 --- a/drivers/fpga/fpga-sec-mgr.c +++ b/drivers/fpga/fpga-sec-mgr.c @@ -38,10 +38,17 @@ static void set_error(struct fpga_sec_mgr *smgr, enum fpga_sec_err err_code) smgr->err_code = err_code; } +static void set_hw_errinfo(struct fpga_sec_mgr *smgr) +{ + if (smgr->sops->get_hw_errinfo) + smgr->hw_errinfo = smgr->sops->get_hw_errinfo(smgr); +} + static void fpga_sec_dev_error(struct fpga_sec_mgr *smgr, enum fpga_sec_err err_code) { set_error(smgr, err_code); + set_hw_errinfo(smgr); smgr->sops->cancel(smgr); } @@ -227,6 +234,23 @@ error_show(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR_RO(error); +static ssize_t +hw_errinfo_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct fpga_sec_mgr *smgr = to_sec_mgr(dev); + int ret; + + mutex_lock(&smgr->lock); + if (smgr->progress != FPGA_SEC_PROG_IDLE) + ret = -EBUSY; + else + ret = sysfs_emit(buf, "0x%llx\n", smgr->hw_errinfo); + mutex_unlock(&smgr->lock); + + return ret; +} +static DEVICE_ATTR_RO(hw_errinfo); + static ssize_t remaining_size_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -258,6 +282,7 @@ static ssize_t filename_store(struct device *dev, struct device_attribute *attr, } smgr->err_code = FPGA_SEC_ERR_NONE; + smgr->hw_errinfo = 0; smgr->request_cancel = false; smgr->progress = FPGA_SEC_PROG_READING; reinit_completion(&smgr->update_done); @@ -292,18 +317,31 @@ static ssize_t cancel_store(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_WO(cancel); +static umode_t +sec_mgr_update_visible(struct kobject *kobj, struct attribute *attr, int n) +{ + struct fpga_sec_mgr *smgr = to_sec_mgr(kobj_to_dev(kobj)); + + if (attr == &dev_attr_hw_errinfo.attr && !smgr->sops->get_hw_errinfo) + return 0; + + return attr->mode; +} + static struct attribute *sec_mgr_update_attrs[] = { &dev_attr_filename.attr, &dev_attr_cancel.attr, &dev_attr_status.attr, &dev_attr_error.attr, &dev_attr_remaining_size.attr, + &dev_attr_hw_errinfo.attr, NULL, }; static struct attribute_group sec_mgr_update_attr_group = { .name = "update", .attrs = sec_mgr_update_attrs, + .is_visible = sec_mgr_update_visible, }; static ssize_t name_show(struct device *dev, diff --git a/include/linux/fpga/fpga-sec-mgr.h b/include/linux/fpga/fpga-sec-mgr.h index e63e6437f394..04235fab8667 100644 --- a/include/linux/fpga/fpga-sec-mgr.h +++ b/include/linux/fpga/fpga-sec-mgr.h @@ -40,6 +40,9 @@ enum fpga_sec_err { * function and is called at the completion * of the update, whether success or failure, * if the prepare function succeeded. + * @get_hw_errinfo: Optional: Return u64 hw specific error info. + * The software err_code may used to determine + * whether the hw error info is applicable. */ struct fpga_sec_mgr_ops { enum fpga_sec_err (*prepare)(struct fpga_sec_mgr *smgr); @@ -48,6 +51,7 @@ struct fpga_sec_mgr_ops { enum fpga_sec_err (*poll_complete)(struct fpga_sec_mgr *smgr); enum fpga_sec_err (*cancel)(struct fpga_sec_mgr *smgr); void (*cleanup)(struct fpga_sec_mgr *smgr); + u64 (*get_hw_errinfo)(struct fpga_sec_mgr *smgr); }; /* Update progress codes */ @@ -73,6 +77,7 @@ struct fpga_sec_mgr { enum fpga_sec_prog progress; enum fpga_sec_prog err_state; /* progress state at time of failure */ enum fpga_sec_err err_code; /* security manager error code */ + u64 hw_errinfo; /* 64 bits of HW specific error info */ bool request_cancel; bool driver_unload; void *priv;