From patchwork Wed Jun 1 21:41:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Winkler, Tomas" X-Patchwork-Id: 9148203 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C8A4D60751 for ; Wed, 1 Jun 2016 21:42:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BAEF626FA0 for ; Wed, 1 Jun 2016 21:42:55 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AF7C52715B; Wed, 1 Jun 2016 21:42:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 74F302712D for ; Wed, 1 Jun 2016 21:42:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752232AbcFAVmh (ORCPT ); Wed, 1 Jun 2016 17:42:37 -0400 Received: from mga03.intel.com ([134.134.136.65]:42955 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752205AbcFAVme (ORCPT ); Wed, 1 Jun 2016 17:42:34 -0400 Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga103.jf.intel.com with ESMTP; 01 Jun 2016 14:42:33 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,403,1459839600"; d="scan'208";a="114398788" Received: from twinkler-lnx.jer.intel.com ([10.12.87.167]) by fmsmga004.fm.intel.com with ESMTP; 01 Jun 2016 14:42:29 -0700 From: Tomas Winkler To: Greg Kroah-Hartman , Ulf Hansson , Adrian Hunter , James Bottomley , "Martin K. Petersen" , Vinayak Holikatti , Andy Lutomirski , =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= , Michael Ryleev , Joao Pinto , Christoph Hellwig , Yaniv Gardi Cc: linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-scsi@vger.kernel.org, Tomas Winkler , Alexander Usyskin Subject: [PATCH v4 8/8] scsi: ufs: connect to RPMB subsystem Date: Wed, 1 Jun 2016 17:41:32 -0400 Message-Id: <1464817292-5407-9-git-send-email-tomas.winkler@intel.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1464817292-5407-1-git-send-email-tomas.winkler@intel.com> References: <1464817292-5407-1-git-send-email-tomas.winkler@intel.com> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Register UFS RPMB LUN with the RPMB subsystem and provide implementation for the RPMB access operations. RPMB partition is accessed via a sequence of security protocol in and security protocol out commands with UFS specific parameters. This multi step process is abstracted into 4 basic RPMB commands. V2: resend V3: resend V4: Kconfig: use select RPMB to ensure valid configuration Signed-off-by: Alexander Usyskin Signed-off-by: Tomas Winkler --- drivers/scsi/ufs/Kconfig | 1 + drivers/scsi/ufs/ufshcd.c | 219 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufshcd.h | 2 + 3 files changed, 222 insertions(+) diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig index 097894a1fab5..e6ff8ecff695 100644 --- a/drivers/scsi/ufs/Kconfig +++ b/drivers/scsi/ufs/Kconfig @@ -38,6 +38,7 @@ config SCSI_UFSHCD select PM_DEVFREQ select DEVFREQ_GOV_SIMPLE_ONDEMAND select NLS + select RPMB ---help--- This selects the support for UFS devices in Linux, say Y and make sure that you know the name of your UFS host adapter (the card diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index f8fa72c31a9d..c087e9713db3 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -37,10 +37,13 @@ * license terms, and distributes only under these terms. */ +#include #include #include #include #include +#include + #include "ufshcd.h" #include "ufs_quirks.h" #include "unipro.h" @@ -4744,6 +4747,214 @@ static void ufshcd_init_icc_levels(struct ufs_hba *hba) } +#define SEC_PROTOCOL_UFS 0xEC +#define SEC_SPECIFIC_UFS_RPMB 0x0001 + +#define SEC_PROTOCOL_CMD_SIZE 12 +#define SEC_PROTOCOL_RETRIES 3 +#define SEC_PROTOCOL_RETRIES_ON_RESET 10 +#define SEC_PROTOCOL_TIMEOUT msecs_to_jiffies(1000) + +static int +ufshcd_rpmb_security_out(struct scsi_device *sdev, + struct rpmb_frame *frames, u32 cnt) +{ + struct scsi_sense_hdr sshdr; + u32 trans_len = cnt * sizeof(struct rpmb_frame); + int reset_retries = SEC_PROTOCOL_RETRIES_ON_RESET; + int ret; + u8 cmd[SEC_PROTOCOL_CMD_SIZE]; + +retry: + memset(cmd, 0, SEC_PROTOCOL_CMD_SIZE); + cmd[0] = SECURITY_PROTOCOL_OUT; + cmd[1] = SEC_PROTOCOL_UFS; + put_unaligned_be16(SEC_SPECIFIC_UFS_RPMB, cmd + 2); + cmd[4] = 0; /* inc_512 bit 7 set to 0 */ + put_unaligned_be32(trans_len, cmd + 6); /* transfer length */ + + ret = scsi_execute_req_flags(sdev, cmd, DMA_TO_DEVICE, + frames, trans_len, &sshdr, + SEC_PROTOCOL_TIMEOUT, SEC_PROTOCOL_RETRIES, + NULL, 0); + if (ret && scsi_sense_valid(&sshdr) && + sshdr.sense_key == UNIT_ATTENTION && + sshdr.asc == 0x29 && sshdr.ascq == 0x00) + /* Device reset might occur several times, + * give it one more chance + */ + if (--reset_retries > 0) + goto retry; + + if (ret) + pr_err("%s: failed with err %0x\n", __func__, ret); + + if (driver_byte(ret) & DRIVER_SENSE) + scsi_print_sense_hdr(sdev, "rpmb: security out", &sshdr); + + return ret; +} + +static int +ufshcd_rpmb_security_in(struct scsi_device *sdev, + struct rpmb_frame *frames, u32 cnt) +{ + struct scsi_sense_hdr sshdr; + u32 alloc_len = cnt * sizeof(struct rpmb_frame); + int reset_retries = SEC_PROTOCOL_RETRIES_ON_RESET; + int ret; + u8 cmd[SEC_PROTOCOL_CMD_SIZE]; + +retry: + memset(cmd, 0, SEC_PROTOCOL_CMD_SIZE); + cmd[0] = SECURITY_PROTOCOL_IN; + cmd[1] = SEC_PROTOCOL_UFS; + put_unaligned_be16(SEC_SPECIFIC_UFS_RPMB, cmd + 2); + cmd[4] = 0; /* inc_512 bit 7 set to 0 */ + put_unaligned_be32(alloc_len, cmd + 6); /* allocation length */ + + ret = scsi_execute_req_flags(sdev, cmd, DMA_FROM_DEVICE, + frames, alloc_len, &sshdr, + SEC_PROTOCOL_TIMEOUT, SEC_PROTOCOL_RETRIES, + NULL, 0); + if (ret && scsi_sense_valid(&sshdr) && + sshdr.sense_key == UNIT_ATTENTION && + sshdr.asc == 0x29 && sshdr.ascq == 0x00) + /* Device reset might occur several times, + * give it one more chance + */ + if (--reset_retries > 0) + goto retry; + + if (ret) + pr_err("%s: failed with err %0x\n", __func__, ret); + + if (driver_byte(ret) & DRIVER_SENSE) + scsi_print_sense_hdr(sdev, "rpmb: security in", &sshdr); + + return ret; +} + + +static int ufshcd_rpmb_send_req(struct device *dev, struct rpmb_data *rpmbd) +{ + unsigned long flags; + struct ufs_hba *hba = dev_get_drvdata(dev); + struct scsi_device *sdev; + struct rpmb_frame *in_frames, *out_frames; + u16 blks; + u16 type; + int ret; + + in_frames = rpmbd->in_frames; + out_frames = rpmbd->out_frames; + + type = rpmbd->req_type; + blks = be16_to_cpu(in_frames[0].block_count); + + dev_dbg(hba->dev, "RPMB : type = %d, blocks = %d\n", type, blks); + + spin_lock_irqsave(hba->host->host_lock, flags); + sdev = hba->sdev_ufs_rpmb; + if (sdev) { + ret = scsi_device_get(sdev); + if (!ret && !scsi_device_online(sdev)) { + ret = -ENODEV; + scsi_device_put(sdev); + } + } else { + ret = -ENODEV; + } + spin_unlock_irqrestore(hba->host->host_lock, flags); + if (ret) + return ret; + + switch (type) { + case RPMB_PROGRAM_KEY: + blks = 1; + /* fall through */ + case RPMB_WRITE_DATA: + /* STEP 1: send request to RPMB partition */ + ret = ufshcd_rpmb_security_out(sdev, in_frames, blks); + if (ret) + break; + + /* STEP 2: check write result (reuse out_frames) */ + memset(out_frames, 0, 512); + out_frames[0].req_resp = cpu_to_be16(RPMB_RESULT_READ); + ret = ufshcd_rpmb_security_out(sdev, out_frames, 1); + if (ret) + break; + + /* STEP 3: get response from RPMB partition */ + ret = ufshcd_rpmb_security_in(sdev, out_frames, 1); + if (ret) + break; + + break; + case RPMB_GET_WRITE_COUNTER: + blks = 1; + /* fall through */ + case RPMB_READ_DATA: + /* STEP 1: send request to RPMB partition */ + ret = ufshcd_rpmb_security_out(sdev, in_frames, 1); + if (ret) + break; + /* STEP 2: get response from RPMB partition */ + ret = ufshcd_rpmb_security_in(sdev, out_frames, blks); + if (ret) + break; + break; + default: + ret = -EINVAL; + break; + } + + scsi_device_put(sdev); + return ret; +} + +static struct rpmb_ops ufshcd_rpmb_dev_ops = { + .send_rpmb_req = ufshcd_rpmb_send_req, + .type = RPMB_TYPE_UFS, +}; + +static inline void ufshcd_rpmb_add(struct ufs_hba *hba) +{ + struct rpmb_dev *rdev; + + scsi_device_get(hba->sdev_ufs_rpmb); + rdev = rpmb_dev_register(hba->dev, &ufshcd_rpmb_dev_ops); + if (IS_ERR(rdev)) { + dev_warn(hba->dev, "%s: cannot register to rpmb %ld\n", + dev_name(hba->dev), PTR_ERR(rdev)); + goto out_put_dev; + } + + return; + +out_put_dev: + scsi_device_put(hba->sdev_ufs_rpmb); + hba->sdev_ufs_rpmb = NULL; +} + +static inline void ufshcd_rpmb_remove(struct ufs_hba *hba) +{ + unsigned long flags; + + if (!hba->sdev_ufs_rpmb) + return; + + spin_lock_irqsave(hba->host->host_lock, flags); + + rpmb_dev_unregister(hba->dev); + scsi_device_put(hba->sdev_ufs_rpmb); + hba->sdev_ufs_rpmb = NULL; + + spin_unlock_irqrestore(hba->host->host_lock, flags); +} + + /** * ufshcd_scsi_add_wlus - Adds required W-LUs * @hba: per-adapter instance @@ -4799,7 +5010,11 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba) ret = PTR_ERR(sdev_rpmb); goto remove_sdev_boot; } + hba->sdev_ufs_rpmb = sdev_rpmb; + + ufshcd_rpmb_add(hba); scsi_device_put(sdev_rpmb); + goto out; remove_sdev_boot: @@ -6168,6 +6383,8 @@ int ufshcd_shutdown(struct ufs_hba *hba) goto out; } + ufshcd_rpmb_remove(hba); + ret = ufshcd_suspend(hba, UFS_SHUTDOWN_PM); out: if (ret) @@ -6184,6 +6401,8 @@ EXPORT_SYMBOL(ufshcd_shutdown); */ void ufshcd_remove(struct ufs_hba *hba) { + ufshcd_rpmb_remove(hba); + scsi_remove_host(hba->host); /* disable interrupts */ ufshcd_disable_intr(hba, hba->intr_mask); diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 4bb65669f052..92bfddf80ae8 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -346,6 +346,7 @@ struct ufs_init_prefetch { * @utmrdl_dma_addr: UTMRDL DMA address * @host: Scsi_Host instance of the driver * @dev: device handle + * @sdev_ufs_rpmb: reference to RPMB device W-LU * @lrb: local reference block * @lrb_in_use: lrb in use * @outstanding_tasks: Bits representing outstanding task requests @@ -408,6 +409,7 @@ struct ufs_hba { * "UFS device" W-LU. */ struct scsi_device *sdev_ufs_device; + struct scsi_device *sdev_ufs_rpmb; enum ufs_dev_pwr_mode curr_dev_pwr_mode; enum uic_link_state uic_link_state;