From patchwork Thu Sep 9 23:33:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 12484173 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 8B45DC433F5 for ; Thu, 9 Sep 2021 23:33:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A3C16113E for ; Thu, 9 Sep 2021 23:33:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232591AbhIIXeT (ORCPT ); Thu, 9 Sep 2021 19:34:19 -0400 Received: from mga02.intel.com ([134.134.136.20]:8845 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349379AbhIIXeS (ORCPT ); Thu, 9 Sep 2021 19:34:18 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10102"; a="208167529" X-IronPort-AV: E=Sophos;i="5.85,281,1624345200"; d="scan'208";a="208167529" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2021 16:33:08 -0700 X-IronPort-AV: E=Sophos;i="5.85,281,1624345200"; d="scan'208";a="581098916" Received: from rhweight-mobl2.amr.corp.intel.com (HELO rhweight-mobl2.ra.intel.com) ([10.212.210.210]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2021 16:33:07 -0700 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 v14 2/4] fpga: m10bmc-sec: expose max10 flash update count Date: Thu, 9 Sep 2021 16:33:02 -0700 Message-Id: <20210909233304.5650-3-russell.h.weight@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210909233304.5650-1-russell.h.weight@intel.com> References: <20210909233304.5650-1-russell.h.weight@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Extend the MAX10 BMC Secure Update driver to provide a sysfs file to expose the flash update count for the FPGA user image. Signed-off-by: Russ Weight Reviewed-by: Tom Rix --- v14: - No change v13: - Updated ABI documentation date and kernel version v12: - Updated Date and KernelVersion fields in ABI documentation v11: - No change v10: - Changed the path expression in the sysfs documentation to replace the n3000 reference with something more generic to accomodate other devices that use the same driver. v9: - Rebased to 5.12-rc2 next - Updated Date and KernelVersion in ABI documentation v8: - Previously patch 3/6, otherwise no change v7: - Updated Date and KernelVersion in ABI documentation v6: - Changed flash_count_show() parameter list to achieve reverse-christmas tree format. - Added WARN_ON() call for (FLASH_COUNT_SIZE / stride) to ensure that the proper count is passed to regmap_bulk_read(). v5: - Renamed sysfs node user_flash_count to flash_count and updated the sysfs documentation accordingly. v4: - Moved the sysfs file for displaying the flash count from the FPGA Security Manager class driver to here. The m10bmc_user_flash_count() function is removed and the functionality is moved into a user_flash_count_show() function. - Added ABI documentation for the new sysfs entry v3: - Changed: iops -> sops, imgr -> smgr, IFPGA_ -> FPGA_, ifpga_ to fpga_ - Changed "MAX10 BMC Secure Engine driver" to "MAX10 BMC Secure Update driver" - Removed wrapper functions (m10bmc_raw_*, m10bmc_sys_*). The underlying functions are now called directly. v2: - Renamed get_qspi_flash_count() to m10bmc_user_flash_count() - Minor code cleanup per review comments - Added m10bmc_ prefix to functions in m10bmc_iops structure --- .../testing/sysfs-driver-intel-m10-bmc-secure | 8 ++++ drivers/fpga/intel-m10-bmc-secure.c | 37 +++++++++++++++++++ 2 files changed, 45 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure index 363403ce992d..22dc43de1f4f 100644 --- a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure +++ b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure @@ -27,3 +27,11 @@ Description: Read only. Returns the root entry hash for the BMC image "hash not programmed". This file is only visible if the underlying device supports it. Format: "0x%x". + +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/flash_count +Date: Aug 2021 +KernelVersion: 5.15 +Contact: Russ Weight +Description: Read only. Returns number of times the secure update + staging area has been flashed. + Format: "%u". diff --git a/drivers/fpga/intel-m10-bmc-secure.c b/drivers/fpga/intel-m10-bmc-secure.c index 03fc571f40f2..88996b525e65 100644 --- a/drivers/fpga/intel-m10-bmc-secure.c +++ b/drivers/fpga/intel-m10-bmc-secure.c @@ -11,6 +11,7 @@ #include #include #include +#include struct m10bmc_sec { struct device *dev; @@ -79,7 +80,43 @@ DEVICE_ATTR_SEC_REH_RO(bmc, BMC_PROG_MAGIC, BMC_PROG_ADDR, BMC_REH_ADDR); DEVICE_ATTR_SEC_REH_RO(sr, SR_PROG_MAGIC, SR_PROG_ADDR, SR_REH_ADDR); DEVICE_ATTR_SEC_REH_RO(pr, PR_PROG_MAGIC, PR_PROG_ADDR, PR_REH_ADDR); +#define FLASH_COUNT_SIZE 4096 /* count stored as inverted bit vector */ + +static ssize_t flash_count_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct m10bmc_sec *sec = dev_get_drvdata(dev); + unsigned int stride, num_bits; + u8 *flash_buf; + int cnt, ret; + + stride = regmap_get_reg_stride(sec->m10bmc->regmap); + num_bits = FLASH_COUNT_SIZE * 8; + + flash_buf = kmalloc(FLASH_COUNT_SIZE, GFP_KERNEL); + if (!flash_buf) + return -ENOMEM; + + WARN_ON(FLASH_COUNT_SIZE % stride); + ret = regmap_bulk_read(sec->m10bmc->regmap, STAGING_FLASH_COUNT, + flash_buf, FLASH_COUNT_SIZE / stride); + if (ret) { + dev_err(sec->dev, + "failed to read flash count: %x cnt %x: %d\n", + STAGING_FLASH_COUNT, FLASH_COUNT_SIZE / stride, ret); + goto exit_free; + } + cnt = num_bits - bitmap_weight((unsigned long *)flash_buf, num_bits); + +exit_free: + kfree(flash_buf); + + return ret ? : sysfs_emit(buf, "%u\n", cnt); +} +static DEVICE_ATTR_RO(flash_count); + static struct attribute *m10bmc_security_attrs[] = { + &dev_attr_flash_count.attr, &dev_attr_bmc_root_entry_hash.attr, &dev_attr_sr_root_entry_hash.attr, &dev_attr_pr_root_entry_hash.attr,