From patchwork Fri May 6 22:54:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Russ Weight X-Patchwork-Id: 12841730 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 ACC3FC433EF for ; Fri, 6 May 2022 22:59:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1444521AbiEFXBc (ORCPT ); Fri, 6 May 2022 19:01:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35638 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1444897AbiEFW61 (ORCPT ); Fri, 6 May 2022 18:58:27 -0400 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1998D6D959; Fri, 6 May 2022 15:54:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1651877678; x=1683413678; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=c3oOL/8ctMHZbRdIKCYhP1D/us2d+lYV7lvX/LHH9uw=; b=BNbQlqlEG2qZng+k0A6e8Efoz1+D4qxfvf84U1oNFTORkLNfliDW6ZGt xOrgjwr9ZZ7dRIaKyHc3ZqtaTstJiS1ZzRiHoKm0/sEoY1acWiqKIKynI QV4Ess/KWVEmeH500Ugk31IKhG/4RO7VHuGw+RHFgY9Z+9Rq4QtKhPO7B oD/M3WMJuydacydrMujOdNtoS9syy6K2DokGiTmxqetOSlbLWgetH75yQ 01yOYUvU5O+XRJ534WaxxRZBWaSyTZorxWh/SJgUpHLfhphAdeUBcV2aT bq2MisRagvi99N/ZtWqjgYFvs6DXeCsoZeMe0c8P6g/PSE9sjnOIs/ya1 w==; X-IronPort-AV: E=McAfee;i="6400,9594,10339"; a="268736174" X-IronPort-AV: E=Sophos;i="5.91,205,1647327600"; d="scan'208";a="268736174" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 May 2022 15:54:22 -0700 X-IronPort-AV: E=Sophos;i="5.91,205,1647327600"; d="scan'208";a="812594489" Received: from rhweight-mobl.amr.corp.intel.com (HELO rhweight-mobl.ra.intel.com) ([10.212.152.127]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 May 2022 15:54:21 -0700 From: Russ Weight To: mdf@kernel.org, hao.wu@intel.com, yilun.xu@intel.com, lee.jones@linaro.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org Cc: trix@redhat.com, marpagan@redhat.com, lgoncalv@redhat.com, matthew.gerlach@linux.intel.com, basheer.ahmed.muddebihal@intel.com, tianfei.zhang@intel.com, Russ Weight Subject: [PATCH v18 5/5] fpga: cardbmc-sec: add card BMC secure update functions Date: Fri, 6 May 2022 15:54:15 -0700 Message-Id: <20220506225415.78763-6-russell.h.weight@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220506225415.78763-1-russell.h.weight@intel.com> References: <20220506225415.78763-1-russell.h.weight@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Create firmware upload ops and call the Firmware Upload support of the Firmware Loader subsystem to enable FPGA image uploads for secure updates of BMC images, FPGA images, etc. Signed-off-by: Russ Weight --- v18: - Moved the firmware_upload_register() function here from an earlier patch since this is where the required ops are provided. - Moved the bmc_sec_remove() function here from an earlier patch to unregister the firmware driver and do cleanup. v17: - Change "m10bmc" in symbol names to "cardbmc" to reflect the fact that the future devices will not necessarily use the MAX10. - Change from image_load class driver to the new firmware_upload functionality of the firmware_loader. - fw_upload_ops functions will return "enum fw_upload_err" data types instead of integer values. v16: - Use 0 instead of FPGA_IMAGE_ERR_NONE to indicate success. - The size alignment check was moved from the FPGA Image Load framework to the prepare() op. - Added cancel_request boolean flag to struct m10bmc_sec. - Moved the RSU cancellation logic from m10bmc_sec_cancel() to a new rsu_cancel() function. - The m10bmc_sec_cancel() function ONLY sets the cancel_request flag. The cancel_request flag is checked at the beginning of the m10bmc_sec_write() and m10bmc_sec_poll_complete() functions. - Adapt to changed prototypes for the prepare() and write() ops. The m10bmc_sec_write_blk() function has been renamed to m10bmc_sec_write(). - Created a cleanup() op, m10bmc_sec_cleanup(), to attempt to cancel an ongoing op during when exiting the update process. v15: - Adapted to changes in the FPGA Image Load framework: (1) All enum types (progress and errors) are now type u32 (2) m10bmc_sec_write_blk() adds *blk_size and max_size parameters and uses *blk_size as provided by the caller. (3) m10bmc_sec_poll_complete() no long checks the driver_unload flag. v14: - Changed symbol names to reflect the renaming of the Security Manager Class driver to FPGA Image Load. v13: - No change v12: - Updated Date and KernelVersion fields in ABI documentation - Removed size parameter from the write_blk() op. m10bmc_sec_write_blk() no longer has a size parameter, and the block size is determined in this (the lower-level) driver. v11: - No change v10: - No change v9: - No change v8: - Previously patch 5/6, otherwise no change v7: - No change v6: - Changed (size / stride) calculation to ((size + stride - 1) / stride) to ensure that the proper count is passed to regmap_bulk_write(). - Removed unnecessary call to rsu_check_complete() in m10bmc_sec_poll_complete() and changed while loop to do/while loop. v5: - No change v4: - No change 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. - Changed calling functions of functions that return "enum fpga_sec_err" to check for (ret != FPGA_SEC_ERR_NONE) instead of (ret) v2: - Reworked the rsu_start_done() function to make it more readable - Reworked while-loop condition/content in rsu_prog_ready() - Minor code cleanup per review comments - Added a comment to the m10bmc_sec_poll_complete() function to explain the context (could take 30+ minutes to complete). - Added m10bmc_ prefix to functions in m10bmc_iops structure - Moved MAX10 BMC address and function definitions to a separate patch. --- drivers/fpga/intel-cardbmc-sec-update.c | 377 ++++++++++++++++++++++++ 1 file changed, 377 insertions(+) diff --git a/drivers/fpga/intel-cardbmc-sec-update.c b/drivers/fpga/intel-cardbmc-sec-update.c index 41c828d6d65a..39d5590d582a 100644 --- a/drivers/fpga/intel-cardbmc-sec-update.c +++ b/drivers/fpga/intel-cardbmc-sec-update.c @@ -17,8 +17,14 @@ struct bmc_sec { struct device *dev; struct intel_m10bmc *m10bmc; + struct fw_upload *fwl; + char *fw_name; + u32 fw_name_id; + bool cancel_request; }; +static DEFINE_XARRAY_ALLOC(fw_upload_xa); + /* Root Entry Hash (REH) support */ #define REH_SHA256_SIZE 32 #define REH_SHA384_SIZE 48 @@ -178,9 +184,349 @@ static const struct attribute_group *bmc_sec_attr_groups[] = { NULL, }; +static void log_error_regs(struct bmc_sec *sec, u32 doorbell) +{ + u32 auth_result; + + dev_err(sec->dev, "RSU error status: 0x%08x\n", doorbell); + + if (!m10bmc_sys_read(sec->m10bmc, M10BMC_AUTH_RESULT, &auth_result)) + dev_err(sec->dev, "RSU auth result: 0x%08x\n", auth_result); +} + +static enum fw_upload_err rsu_check_idle(struct bmc_sec *sec) +{ + u32 doorbell; + int ret; + + ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell); + if (ret) + return FW_UPLOAD_ERR_RW_ERROR; + + if (rsu_prog(doorbell) != RSU_PROG_IDLE && + rsu_prog(doorbell) != RSU_PROG_RSU_DONE) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_BUSY; + } + + return FW_UPLOAD_ERR_NONE; +} + +static inline bool rsu_start_done(u32 doorbell) +{ + u32 status, progress; + + if (doorbell & DRBL_RSU_REQUEST) + return false; + + status = rsu_stat(doorbell); + if (status == RSU_STAT_ERASE_FAIL || status == RSU_STAT_WEAROUT) + return true; + + progress = rsu_prog(doorbell); + if (progress != RSU_PROG_IDLE && progress != RSU_PROG_RSU_DONE) + return true; + + return false; +} + +static enum fw_upload_err rsu_update_init(struct bmc_sec *sec) +{ + u32 doorbell, status; + int ret; + + ret = regmap_update_bits(sec->m10bmc->regmap, + M10BMC_SYS_BASE + M10BMC_DOORBELL, + DRBL_RSU_REQUEST | DRBL_HOST_STATUS, + DRBL_RSU_REQUEST | + FIELD_PREP(DRBL_HOST_STATUS, + HOST_STATUS_IDLE)); + if (ret) + return FW_UPLOAD_ERR_RW_ERROR; + + ret = regmap_read_poll_timeout(sec->m10bmc->regmap, + M10BMC_SYS_BASE + M10BMC_DOORBELL, + doorbell, + rsu_start_done(doorbell), + NIOS_HANDSHAKE_INTERVAL_US, + NIOS_HANDSHAKE_TIMEOUT_US); + + if (ret == -ETIMEDOUT) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_TIMEOUT; + } else if (ret) { + return FW_UPLOAD_ERR_RW_ERROR; + } + + status = rsu_stat(doorbell); + if (status == RSU_STAT_WEAROUT) { + dev_warn(sec->dev, "Excessive flash update count detected\n"); + return FW_UPLOAD_ERR_WEAROUT; + } else if (status == RSU_STAT_ERASE_FAIL) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_HW_ERROR; + } + + return FW_UPLOAD_ERR_NONE; +} + +static enum fw_upload_err rsu_prog_ready(struct bmc_sec *sec) +{ + unsigned long poll_timeout; + u32 doorbell, progress; + int ret; + + ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell); + if (ret) + return FW_UPLOAD_ERR_RW_ERROR; + + poll_timeout = jiffies + msecs_to_jiffies(RSU_PREP_TIMEOUT_MS); + while (rsu_prog(doorbell) == RSU_PROG_PREPARE) { + msleep(RSU_PREP_INTERVAL_MS); + if (time_after(jiffies, poll_timeout)) + break; + + ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell); + if (ret) + return FW_UPLOAD_ERR_RW_ERROR; + } + + progress = rsu_prog(doorbell); + if (progress == RSU_PROG_PREPARE) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_TIMEOUT; + } else if (progress != RSU_PROG_READY) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_HW_ERROR; + } + + return FW_UPLOAD_ERR_NONE; +} + +static enum fw_upload_err rsu_send_data(struct bmc_sec *sec) +{ + u32 doorbell; + int ret; + + ret = regmap_update_bits(sec->m10bmc->regmap, + M10BMC_SYS_BASE + M10BMC_DOORBELL, + DRBL_HOST_STATUS, + FIELD_PREP(DRBL_HOST_STATUS, + HOST_STATUS_WRITE_DONE)); + if (ret) + return FW_UPLOAD_ERR_RW_ERROR; + + ret = regmap_read_poll_timeout(sec->m10bmc->regmap, + M10BMC_SYS_BASE + M10BMC_DOORBELL, + doorbell, + rsu_prog(doorbell) != RSU_PROG_READY, + NIOS_HANDSHAKE_INTERVAL_US, + NIOS_HANDSHAKE_TIMEOUT_US); + + if (ret == -ETIMEDOUT) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_TIMEOUT; + } else if (ret) { + return FW_UPLOAD_ERR_RW_ERROR; + } + + switch (rsu_stat(doorbell)) { + case RSU_STAT_NORMAL: + case RSU_STAT_NIOS_OK: + case RSU_STAT_USER_OK: + case RSU_STAT_FACTORY_OK: + break; + default: + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_HW_ERROR; + } + + return FW_UPLOAD_ERR_NONE; +} + +static int rsu_check_complete(struct bmc_sec *sec, u32 *doorbell) +{ + if (m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, doorbell)) + return -EIO; + + switch (rsu_stat(*doorbell)) { + case RSU_STAT_NORMAL: + case RSU_STAT_NIOS_OK: + case RSU_STAT_USER_OK: + case RSU_STAT_FACTORY_OK: + break; + default: + return -EINVAL; + } + + switch (rsu_prog(*doorbell)) { + case RSU_PROG_IDLE: + case RSU_PROG_RSU_DONE: + return 0; + case RSU_PROG_AUTHENTICATING: + case RSU_PROG_COPYING: + case RSU_PROG_UPDATE_CANCEL: + case RSU_PROG_PROGRAM_KEY_HASH: + return -EAGAIN; + default: + return -EINVAL; + } +} + +static enum fw_upload_err rsu_cancel(struct bmc_sec *sec) +{ + u32 doorbell; + int ret; + + ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell); + if (ret) + return FW_UPLOAD_ERR_RW_ERROR; + + if (rsu_prog(doorbell) != RSU_PROG_READY) + return FW_UPLOAD_ERR_BUSY; + + ret = regmap_update_bits(sec->m10bmc->regmap, + M10BMC_SYS_BASE + M10BMC_DOORBELL, + DRBL_HOST_STATUS, + FIELD_PREP(DRBL_HOST_STATUS, + HOST_STATUS_ABORT_RSU)); + if (ret) + return FW_UPLOAD_ERR_RW_ERROR; + + return FW_UPLOAD_ERR_CANCELED; +} + +static enum fw_upload_err bmc_sec_prepare(struct fw_upload *fwl, + const u8 *data, u32 size) +{ + struct bmc_sec *sec = fwl->dd_handle; + u32 ret; + + sec->cancel_request = false; + + if (!size || size & 0x3 || size > M10BMC_STAGING_SIZE) + return FW_UPLOAD_ERR_INVALID_SIZE; + + ret = rsu_check_idle(sec); + if (ret != FW_UPLOAD_ERR_NONE) + return ret; + + ret = rsu_update_init(sec); + if (ret != FW_UPLOAD_ERR_NONE) + return ret; + + ret = rsu_prog_ready(sec); + if (ret != FW_UPLOAD_ERR_NONE) + return ret; + + if (sec->cancel_request) + return rsu_cancel(sec); + + return FW_UPLOAD_ERR_NONE; +} + +#define WRITE_BLOCK_SIZE 0x4000 /* Default write-block size is 0x4000 bytes */ + +static enum fw_upload_err bmc_sec_write(struct fw_upload *fwl, const u8 *data, + u32 offset, u32 size, u32 *written) +{ + struct bmc_sec *sec = fwl->dd_handle; + unsigned int stride = regmap_get_reg_stride(sec->m10bmc->regmap); + u32 blk_size, doorbell; + int ret; + + if (sec->cancel_request) + return rsu_cancel(sec); + + ret = m10bmc_sys_read(sec->m10bmc, M10BMC_DOORBELL, &doorbell); + if (ret) { + return FW_UPLOAD_ERR_RW_ERROR; + } else if (rsu_prog(doorbell) != RSU_PROG_READY) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_HW_ERROR; + } + + blk_size = min_t(u32, WRITE_BLOCK_SIZE, size); + ret = regmap_bulk_write(sec->m10bmc->regmap, + M10BMC_STAGING_BASE + offset, + (void *)data + offset, + (blk_size + stride - 1) / stride); + + if (ret) + return FW_UPLOAD_ERR_RW_ERROR; + + *written = blk_size; + return FW_UPLOAD_ERR_NONE; +} + +static enum fw_upload_err bmc_sec_poll_complete(struct fw_upload *fwl) +{ + struct bmc_sec *sec = fwl->dd_handle; + unsigned long poll_timeout; + u32 doorbell, result; + int ret; + + if (sec->cancel_request) + return rsu_cancel(sec); + + result = rsu_send_data(sec); + if (result != FW_UPLOAD_ERR_NONE) + return result; + + poll_timeout = jiffies + msecs_to_jiffies(RSU_COMPLETE_TIMEOUT_MS); + do { + msleep(RSU_COMPLETE_INTERVAL_MS); + ret = rsu_check_complete(sec, &doorbell); + } while (ret == -EAGAIN && !time_after(jiffies, poll_timeout)); + + if (ret == -EAGAIN) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_TIMEOUT; + } else if (ret == -EIO) { + return FW_UPLOAD_ERR_RW_ERROR; + } else if (ret) { + log_error_regs(sec, doorbell); + return FW_UPLOAD_ERR_HW_ERROR; + } + + return FW_UPLOAD_ERR_NONE; +} + +/* + * bmc_sec_cancel() may be called asynchronously with an on-going update. + * All other functions are called sequentially in a single thread. To avoid + * contention on register accesses, bmc_sec_cancel() must only update + * the cancel_request flag. Other functions will check this flag and handle + * the cancel request synchronously. + */ +static void bmc_sec_cancel(struct fw_upload *fwl) +{ + struct bmc_sec *sec = fwl->dd_handle; + + sec->cancel_request = true; +} + +static void bmc_sec_cleanup(struct fw_upload *fwl) +{ + struct bmc_sec *sec = fwl->dd_handle; + + (void)rsu_cancel(sec); +} + +static const struct fw_upload_ops cardbmc_ops = { + .prepare = bmc_sec_prepare, + .write = bmc_sec_write, + .poll_complete = bmc_sec_poll_complete, + .cancel = bmc_sec_cancel, + .cleanup = bmc_sec_cleanup, +}; + #define SEC_UPDATE_LEN_MAX 32 static int bmc_sec_probe(struct platform_device *pdev) { + char buf[SEC_UPDATE_LEN_MAX]; + struct fw_upload *fwl; + unsigned int len, ret; struct bmc_sec *sec; sec = devm_kzalloc(&pdev->dev, sizeof(*sec), GFP_KERNEL); @@ -191,6 +537,36 @@ static int bmc_sec_probe(struct platform_device *pdev) sec->m10bmc = dev_get_drvdata(pdev->dev.parent); dev_set_drvdata(&pdev->dev, sec); + ret = xa_alloc(&fw_upload_xa, &sec->fw_name_id, sec, + xa_limit_32b, GFP_KERNEL); + if (ret) + return ret; + + len = scnprintf(buf, SEC_UPDATE_LEN_MAX, "secure-update%d", + sec->fw_name_id); + sec->fw_name = kmemdup_nul(buf, len, GFP_KERNEL); + + fwl = firmware_upload_register(THIS_MODULE, sec->dev, sec->fw_name, + &cardbmc_ops, sec); + if (IS_ERR(fwl)) { + dev_err(sec->dev, "Firmware Upload driver failed to start\n"); + kfree(sec->fw_name); + xa_erase(&fw_upload_xa, sec->fw_name_id); + return PTR_ERR(fwl); + } + + sec->fwl = fwl; + return 0; +} + +static int bmc_sec_remove(struct platform_device *pdev) +{ + struct bmc_sec *sec = dev_get_drvdata(&pdev->dev); + + firmware_upload_unregister(sec->fwl); + kfree(sec->fw_name); + xa_erase(&fw_upload_xa, sec->fw_name_id); + return 0; } @@ -203,6 +579,7 @@ static const struct platform_device_id intel_cardbmc_sec_ids[] = { static struct platform_driver intel_cardbmc_sec_driver = { .probe = bmc_sec_probe, + .remove = bmc_sec_remove, .driver = { .name = "intel-cardbmc-sec-update", .dev_groups = bmc_sec_attr_groups,