From patchwork Fri Mar 12 19:36:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 12135897 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=-16.8 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 0CDF0C4332B for ; Fri, 12 Mar 2021 19:37:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C10C264F83 for ; Fri, 12 Mar 2021 19:37:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234296AbhCLTg5 (ORCPT ); Fri, 12 Mar 2021 14:36:57 -0500 Received: from mga17.intel.com ([192.55.52.151]:44156 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234200AbhCLTg2 (ORCPT ); Fri, 12 Mar 2021 14:36:28 -0500 IronPort-SDR: H6w+pU7CJuKnR6nhk/mxEPgcBe+aMqxmGlnWYw2dxmm87iBXpTRZgk35vGlokRMzzD3GB/xlFF PJj8daMvDDEA== X-IronPort-AV: E=McAfee;i="6000,8403,9921"; a="168796316" X-IronPort-AV: E=Sophos;i="5.81,244,1610438400"; d="scan'208";a="168796316" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Mar 2021 11:36:27 -0800 IronPort-SDR: ECrt/YZmrlZ3qL6xPGC0R6tKvqMfObZTs0SvIuwu2emgldFeuxj/NLUzsbVpCy99o72FTbOZvH lW0petR0rcng== X-IronPort-AV: E=Sophos;i="5.81,244,1610438400"; d="scan'208";a="510426159" Received: from rhweight-mobl2.amr.corp.intel.com (HELO rhweight-mobl2.ra.intel.com) ([10.209.51.149]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Mar 2021 11:36:27 -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 v10 3/5] fpga: m10bmc-sec: expose max10 canceled keys in sysfs Date: Fri, 12 Mar 2021 11:36:21 -0800 Message-Id: <20210312193623.326306-4-russell.h.weight@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210312193623.326306-1-russell.h.weight@intel.com> References: <20210312193623.326306-1-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 sysfs files to expose the canceled code signing key (CSK) bit vectors. These use the standard bitmap list format (e.g. 1,2-6,9). Signed-off-by: Russ Weight Reviewed-by: Tom Rix Reviewed-by: Tom Rix --- v10: - Changed the path expressions 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 4/6, otherwise no change v7: - Updated Date and KernelVersion in ABI documentation v6: - Added WARN_ON() call for (size / stride) to ensure that the proper count is passed to regmap_bulk_read(). v5: - No change v4: - Moved sysfs files for displaying the code-signing-key (CSK) cancellation vectors from the FPGA Security Manger class driver to here. The m10bmc_csk_vector() and m10bmc_csk_cancel_nbits() functions are removed and the functionality from these functions is moved into a show_canceled_csk() function for for displaying the CSK vectors. - Added ABI documentation for new sysfs entries 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. - Renamed get_csk_vector() to m10bmc_csk_vector() v2: - Replaced small function-creation macros for explicit function declarations. - Fixed get_csk_vector() function to properly apply the stride variable in calls to m10bmc_raw_bulk_read() - Added m10bmc_ prefix to functions in m10bmc_iops structure --- .../testing/sysfs-driver-intel-m10-bmc-secure | 24 ++++++++++ drivers/fpga/intel-m10-bmc-secure.c | 48 +++++++++++++++++++ 2 files changed, 72 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure index 598db1116d34..93ad4de9b941 100644 --- a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure +++ b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-secure @@ -28,6 +28,30 @@ Description: Read only. Returns the root entry hash for the BMC image underlying device supports it. Format: "0x%x". +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/sr_canceled_csks +Date: April 2021 +KernelVersion: 5.13 +Contact: Russ Weight +Description: Read only. Returns a list of indices for canceled code + signing keys for the static region. The standard bitmap + list format is used (e.g. "1,2-6,9"). + +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/pr_canceled_csks +Date: April 2021 +KernelVersion: 5.13 +Contact: Russ Weight +Description: Read only. Returns a list of indices for canceled code + signing keys for the partial reconfiguration region. The + standard bitmap list format is used (e.g. "1,2-6,9"). + +What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/bmc_canceled_csks +Date: April 2021 +KernelVersion: 5.13 +Contact: Russ Weight +Description: Read only. Returns a list of indices for canceled code + signing keys for the BMC. The standard bitmap list format + is used (e.g. "1,2-6,9"). + What: /sys/bus/platform/drivers/intel-m10bmc-secure/.../security/flash_count Date: April 2021 KernelVersion: 5.13 diff --git a/drivers/fpga/intel-m10-bmc-secure.c b/drivers/fpga/intel-m10-bmc-secure.c index ecd63c13cb2d..87e16c146569 100644 --- a/drivers/fpga/intel-m10-bmc-secure.c +++ b/drivers/fpga/intel-m10-bmc-secure.c @@ -79,6 +79,51 @@ 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 CSK_BIT_LEN 128U +#define CSK_32ARRAY_SIZE DIV_ROUND_UP(CSK_BIT_LEN, 32) + +static ssize_t +show_canceled_csk(struct device *dev, u32 addr, char *buf) +{ + unsigned int i, stride, size = CSK_32ARRAY_SIZE * sizeof(u32); + struct m10bmc_sec *sec = dev_get_drvdata(dev); + DECLARE_BITMAP(csk_map, CSK_BIT_LEN); + __le32 csk_le32[CSK_32ARRAY_SIZE]; + u32 csk32[CSK_32ARRAY_SIZE]; + int ret; + + stride = regmap_get_reg_stride(sec->m10bmc->regmap); + + WARN_ON(size % stride); + ret = regmap_bulk_read(sec->m10bmc->regmap, addr, csk_le32, + size / stride); + if (ret) { + dev_err(sec->dev, "failed to read CSK vector: %x cnt %x: %d\n", + addr, size / stride, ret); + return ret; + } + + for (i = 0; i < CSK_32ARRAY_SIZE; i++) + csk32[i] = le32_to_cpu(((csk_le32[i]))); + + bitmap_from_arr32(csk_map, csk32, CSK_BIT_LEN); + bitmap_complement(csk_map, csk_map, CSK_BIT_LEN); + return bitmap_print_to_pagebuf(1, buf, csk_map, CSK_BIT_LEN); +} + +#define DEVICE_ATTR_SEC_CSK_RO(_name, _addr) \ +static ssize_t _name##_canceled_csks_show(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ return show_canceled_csk(dev, _addr, buf); } \ +static DEVICE_ATTR_RO(_name##_canceled_csks) + +#define CSK_VEC_OFFSET 0x34 + +DEVICE_ATTR_SEC_CSK_RO(bmc, BMC_PROG_ADDR + CSK_VEC_OFFSET); +DEVICE_ATTR_SEC_CSK_RO(sr, SR_PROG_ADDR + CSK_VEC_OFFSET); +DEVICE_ATTR_SEC_CSK_RO(pr, PR_PROG_ADDR + CSK_VEC_OFFSET); + #define FLASH_COUNT_SIZE 4096 /* count stored as inverted bit vector */ static ssize_t flash_count_show(struct device *dev, @@ -119,6 +164,9 @@ static struct attribute *m10bmc_security_attrs[] = { &dev_attr_bmc_root_entry_hash.attr, &dev_attr_sr_root_entry_hash.attr, &dev_attr_pr_root_entry_hash.attr, + &dev_attr_sr_canceled_csks.attr, + &dev_attr_pr_canceled_csks.attr, + &dev_attr_bmc_canceled_csks.attr, NULL, };