From patchwork Fri Sep 7 09:49:41 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Avri Altman X-Patchwork-Id: 10591973 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B1F8714E0 for ; Fri, 7 Sep 2018 09:51:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 908E82AD14 for ; Fri, 7 Sep 2018 09:51:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 84A992AD64; Fri, 7 Sep 2018 09:51:19 +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=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,T_DKIM_INVALID 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 E38442AD14 for ; Fri, 7 Sep 2018 09:51:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728378AbeIGOb1 (ORCPT ); Fri, 7 Sep 2018 10:31:27 -0400 Received: from esa2.hgst.iphmx.com ([68.232.143.124]:37238 "EHLO esa2.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726031AbeIGOb1 (ORCPT ); Fri, 7 Sep 2018 10:31:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1536313947; x=1567849947; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=Ogub4OltWnuZPZ7jpTbIEoNFfUI2AYe9ViQJhS7lgvw=; b=iTWdni8uXFZlYHri8F9QEKqD+rXPkFFiRZZvmiUZvXbUz8dRospuhUzT hvmMju2cVTHY9rcIawDfQq9f/BJ1Scr7JlDiaOFyIFT8FEim8jnI0KZ/A vXim02CHSXbfYxwna0QwKgwmSeR2xv0G+DR7yoAl0QSXhiZ6PLYuEXNPC lR2962J3yvrrtJO0NXVLVZFDjI1C7s10NnhxM9yB2SeonsRRxWRVTjLEv I21LCiVsYwWNVI/tWk7OcUUY3V1GqP4dG5wGTWF9xmQs+UQ3TwOJxkoyx oL1k3DxLlLSA45SuQbpk/XghX93ueWqV8fF+/mWgNJycm++pFoWRKRZS0 Q==; X-IronPort-AV: E=Sophos;i="5.53,341,1531756800"; d="scan'208";a="186775550" Received: from h199-255-45-14.hgst.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 07 Sep 2018 17:52:27 +0800 Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep01.wdc.com with ESMTP; 07 Sep 2018 02:37:59 -0700 Received: from kfae422988.sdcorp.global.sandisk.com ([10.0.231.37]) by uls-op-cesaip01.wdc.com with ESMTP; 07 Sep 2018 02:51:16 -0700 From: Avri Altman To: Christoph Hellwig , Johannes Thumshirn , Hannes Reinecke , Bart Van Assche , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org Cc: Stanislav Nijnikov , Avi Shchislowski , Alex Lemberg , Subhash Jadavani , Vinayak Holikatti , Avri Altman Subject: [PATCH v4 5/7] scsi: ufs: Add API to execute raw upiu commands Date: Fri, 7 Sep 2018 12:49:41 +0300 Message-Id: <1536313783-13025-6-git-send-email-avri.altman@wdc.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1536313783-13025-1-git-send-email-avri.altman@wdc.com> References: <1536313783-13025-1-git-send-email-avri.altman@wdc.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 The UFS host software uses a combination of a host register set, and Transfer Request Descriptors in system memory to communicate with host controller hardware. In its mmio space, a separate places are assigned to UTP Transfer Request Descriptor ("utrd") list, and to UTP Task Management Request Descriptor ("utmrd") list. The provided API supports utrd-typed requests: nop out and device management commands. It also supports utmrd-type requests: task management requests. Other UPIU types are not supported for now. We utilize the already existing code for tag and task work queues. That is, all utrd-typed UPIUs are "disguised" as device management commands. Similarly, the utmrd-typed UPUIs uses the task management infrastructure. It is up to the caller to fill the upiu request properly, as it will be copied without any further input validations. Signed-off-by: Avri Altman --- drivers/scsi/ufs/ufshcd.c | 151 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/scsi/ufs/ufshcd.h | 6 ++ 2 files changed, 157 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index e53e145..efde4d82 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -257,6 +257,7 @@ static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on, static irqreturn_t ufshcd_intr(int irq, void *__hba); static int ufshcd_change_power_mode(struct ufs_hba *hba, struct ufs_pa_layer_attr *pwr_mode); + static inline bool ufshcd_valid_tag(struct ufs_hba *hba, int tag) { return tag >= 0 && tag < hba->nutrs; @@ -5663,6 +5664,156 @@ static int ufshcd_issue_tm_cmd(struct ufs_hba *hba, } /** + * ufshcd_issue_devman_upiu_cmd - API for sending "utrd" type requests + * @hba: per-adapter instance + * @req_upiu: upiu request + * @rsp_upiu: upiu reply + * @msgcode: message code, one of UPIU Transaction Codes Initiator to Target + * @desc_buff: pointer to descriptor buffer, NULL if NA + * @buff_len: descriptor size, 0 if NA + * @rw: either READ or WRITE + * + * Those type of requests uses UTP Transfer Request Descriptor - utrd. + * Therefore, it "rides" the device management infrastructure: uses its tag and + * tasks work queues. + * + * Since there is only one available tag for device management commands, + * the caller is expected to hold the hba->dev_cmd.lock mutex. + */ +static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba, + struct utp_upiu_req *req_upiu, + struct utp_upiu_req *rsp_upiu, + u8 *desc_buff, int *buff_len, + int cmd_type, int rw) +{ + struct ufshcd_lrb *lrbp; + int err = 0; + int tag; + struct completion wait; + unsigned long flags; + u32 upiu_flags; + u8 *descp; + + down_read(&hba->clk_scaling_lock); + + wait_event(hba->dev_cmd.tag_wq, ufshcd_get_dev_cmd_tag(hba, &tag)); + + init_completion(&wait); + lrbp = &hba->lrb[tag]; + WARN_ON(lrbp->cmd); + + lrbp->cmd = NULL; + lrbp->sense_bufflen = 0; + lrbp->sense_buffer = NULL; + lrbp->task_tag = tag; + lrbp->lun = 0; + lrbp->command_type = hba->ufs_version == UFSHCI_VERSION_10 || + hba->ufs_version == UFSHCI_VERSION_11 ? + UTP_CMD_TYPE_DEV_MANAGE : + UTP_CMD_TYPE_UFS_STORAGE; + lrbp->intr_cmd = true; + hba->dev_cmd.type = cmd_type; + + /* update the task tag in the request upiu */ + req_upiu->header.dword_0 |= cpu_to_be32(tag); + + ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE); + + /* just copy the upiu request as it is */ + memcpy(lrbp->ucd_req_ptr, req_upiu, GENERAL_UPIU_REQUEST_SIZE); + + if (desc_buff && rw == WRITE) { + descp = (u8 *)lrbp->ucd_req_ptr + GENERAL_UPIU_REQUEST_SIZE; + memcpy(descp, desc_buff, *buff_len); + *buff_len = 0; + } + + memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp)); + + hba->dev_cmd.complete = &wait; + + /* Make sure descriptors are ready before ringing the doorbell */ + wmb(); + spin_lock_irqsave(hba->host->host_lock, flags); + ufshcd_send_command(hba, tag); + spin_unlock_irqrestore(hba->host->host_lock, flags); + + /* + * ignore the returning value here - ufshcd_check_query_response is + * bound to fail since dev_cmd.query and dev_cmd.type were left empty. + * read the response directly ignoring all errors. + */ + ufshcd_wait_for_dev_cmd(hba, lrbp, QUERY_REQ_TIMEOUT); + + /* just copy the upiu request as it is */ + memcpy(rsp_upiu, lrbp->ucd_rsp_ptr, GENERAL_UPIU_REQUEST_SIZE); + + ufshcd_put_dev_cmd_tag(hba, tag); + wake_up(&hba->dev_cmd.tag_wq); + up_read(&hba->clk_scaling_lock); + return err; +} + +/** + * ufshcd_exec_raw_upiu_cmd - API function for sending raw upiu commands + * @hba: per-adapter instance + * @req_upiu: upiu request + * @rsp_upiu: upiu reply - only 8 DW as we do not support scsi commands + * @msgcode: message code, one of UPIU Transaction Codes Initiator to Target + * @desc_buff: pointer to descriptor buffer, NULL if NA + * @buff_len: descriptor size, 0 if NA + * @rw: either READ or WRITE + * + * Supports UTP Transfer requests (nop and query), and UTP Task + * Management requests. + * It is up to the caller to fill the upiu conent properly, as it will + * be copied without any further input validations. + */ +int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba, + struct utp_upiu_req *req_upiu, + struct utp_upiu_req *rsp_upiu, + int msgcode, + u8 *desc_buff, int *buff_len, int rw) +{ + int err; + int cmd_type = DEV_CMD_TYPE_QUERY; + u8 resp = 0xF; + + if (desc_buff && rw == READ) { + err = -ENOTSUPP; + goto out; + } + + switch (msgcode) { + case UPIU_TRANSACTION_NOP_OUT: + cmd_type = DEV_CMD_TYPE_NOP; + /* fall through */ + case UPIU_TRANSACTION_QUERY_REQ: + ufshcd_hold(hba, false); + mutex_lock(&hba->dev_cmd.lock); + err = ufshcd_issue_devman_upiu_cmd(hba, req_upiu, rsp_upiu, + desc_buff, buff_len, + cmd_type, rw); + mutex_unlock(&hba->dev_cmd.lock); + ufshcd_release(hba); + + break; + case UPIU_TRANSACTION_TASK_REQ: + err = ufshcd_issue_tm_cmd(hba, req_upiu, rsp_upiu, 0, 0, 0, + &resp); + + break; + default: + err = -EINVAL; + + break; + } + +out: + return err; +} + +/** * ufshcd_eh_device_reset_handler - device reset handler registered to * scsi layer. * @cmd: SCSI command pointer diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 46ea7c3..01e2a82 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -894,6 +894,12 @@ int ufshcd_map_desc_id_to_length(struct ufs_hba *hba, enum desc_idn desc_id, u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba); +int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba, + struct utp_upiu_req *req_upiu, + struct utp_upiu_req *rsp_upiu, + int msgcode, + u8 *desc_buff, int *buff_len, int rw); + /* Wrapper functions for safely calling variant operations */ static inline const char *ufshcd_get_var_name(struct ufs_hba *hba) {