From patchwork Thu Feb 2 04:57:27 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinayak Holikatti X-Patchwork-Id: 6566 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 8BDAD23E16 for ; Thu, 2 Feb 2012 04:58:16 +0000 (UTC) Received: from mail-iy0-f180.google.com (mail-iy0-f180.google.com [209.85.210.180]) by fiordland.canonical.com (Postfix) with ESMTP id 332ABA1853A for ; Thu, 2 Feb 2012 04:58:16 +0000 (UTC) Received: by mail-iy0-f180.google.com with SMTP id z7so3595619iab.11 for ; Wed, 01 Feb 2012 20:58:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=x-forwarded-to:x-forwarded-for:delivered-to:received-spf :dkim-signature:from:to:cc:subject:date:message-id:x-mailer :in-reply-to:references; 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Authentication-Results: mx.google.com; spf=pass (google.com: domain of vinholikatti@gmail.com designates 209.85.210.178 as permitted sender) smtp.mail=vinholikatti@gmail.com; dkim=pass header.i=@gmail.com Received: by mail-iy0-f178.google.com with SMTP id k3so3406599iae.37 for ; Wed, 01 Feb 2012 20:58:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; bh=yNgiD+1EwKozhaz2inEu1ufTw1FcddkyS4zbVS9GLfo=; b=TCLTqjQQFpB5VQuv7fWQAY+RjtsCd/p0oEGX6sBs07M8yAfi/08cQXT+p9q03bWTcV Xh4mk58xJ0MCHY9+yXY2q78zHo4+TM/11G93LTyuTRJ0rapcCHxywBNAcOdn5A1APzjA STI76Z8MfTZoNwvc9Tgn0ZJ4r/B0rZxuhI+o0= Received: by 10.42.158.195 with SMTP id i3mr1341450icx.7.1328158694667; Wed, 01 Feb 2012 20:58:14 -0800 (PST) Received: from girishks ([115.113.119.130]) by mx.google.com with ESMTPS id ut1sm2141504igc.2.2012.02.01.20.58.08 (version=SSLv3 cipher=OTHER); Wed, 01 Feb 2012 20:58:14 -0800 (PST) From: Vinayak Holikatti To: James.Bottomley@HansenPartnership.com Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, patches@linaro.org, linux-samsung-soc@vger.kernel.org, saugata.das@linaro.org, arnd@arndb.de, venkat@linaro.org, girish.shivananjappa@linaro.org, vishak.g@samsung.com, k.rajesh@samsung.com, yejin.moon@samsung.com, Santosh Yaraganavi , Vinayak Holikatti Subject: [PATCH 2/4] [SCSI] ufshcd: UFS UTP Transfer requests handling Date: Thu, 2 Feb 2012 10:27:27 +0530 Message-Id: <1328158649-4137-3-git-send-email-vinholikatti@gmail.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1328158649-4137-1-git-send-email-vinholikatti@gmail.com> References: <1328158649-4137-1-git-send-email-vinholikatti@gmail.com> From: Santosh Yaraganavi This patch adds support for Transfer request handling. ufshcd includes following implementations: - SCSI queuecommand - Compose UPIU(UFS Protocol information unit) - Issue commands to UFS host controller - Handle completed commands Signed-off-by: Santosh Yaraganavi Signed-off-by: Vinayak Holikatti Reviewed-by: Arnd Bergmann Reviewed-by: Saugata Das Reviewed-by: Vishak G Reviewed-by: Girish K S --- drivers/scsi/ufs/ufshcd.c | 447 +++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 447 insertions(+), 0 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index c82eeea..23d758b 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -62,6 +62,7 @@ #include #include #include +#include #include #include "ufs.h" @@ -81,6 +82,7 @@ enum { UFSHCD_MAX_CHANNEL = 1, UFSHCD_MAX_ID = 1, UFSHCD_MAX_LUNS = 8, + UFSHCD_CMD_PER_LUN = 16, UFSHCD_CAN_QUEUE = 32, BYTES_128 = 128, BYTES_1024 = 1024 @@ -146,6 +148,7 @@ struct uic_command { * @host: Scsi_Host instance of the driver * @pdev: PCI device handle * @lrb: local reference block + * @outstanding_reqs: Bits representing outstanding transfer requests * @capabilities: UFS Controller Capabilities * @nutrs: Transfer Request Queue depth supported by controller * @nutmrs: Task Management Queue depth supported by controller @@ -184,6 +187,8 @@ struct ufs_hba { struct ufshcd_lrb *lrb; + u32 outstanding_reqs; + u32 capabilities; int nutrs; int nutmrs; @@ -204,12 +209,28 @@ struct ufs_hba { * @ucd_cmd_ptr: UCD address of the command * @ucd_rsp_ptr: Response UPIU address for this command * @ucd_prdt_ptr: PRDT address of the command + * @cmd: pointer to scsi command + * @sense_buffer: pointer sense buffer address of the scsi command + * @sense_bufflen: Length of the sense buffer + * @scsi_status: SCSI status of the command + * @command_type: SCSI, UFS, Query. + * @task_tag: Task tag of the command + * @lun: LUN of the command */ struct ufshcd_lrb { struct utp_transfer_req_desc *utr_descriptor_ptr; struct utp_upiu_cmd *ucd_cmd_ptr; struct utp_upiu_rsp *ucd_rsp_ptr; struct ufshcd_sg_entry *ucd_prdt_ptr; + + struct scsi_cmnd *cmd; + u8 *sense_buffer; + unsigned int sense_bufflen; + int scsi_status; + + int command_type; + int task_tag; + int lun; }; /** @@ -236,6 +257,18 @@ static inline int ufshcd_is_device_present(u32 reg_hcs) } /** + * ufshcd_get_tr_ocs - Get the UTRD Overall Command Status + * @lrb: pointer to local command reference block + * + * This function is used to get the OCS field from UTRD + * Returns the OCS field in the UTRD + */ +static inline int ufshcd_get_tr_ocs(struct ufshcd_lrb *lrbp) +{ + return lrbp->utr_descriptor_ptr->header.dword_2 & MASK_OCS; +} + +/** * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY * @reg: Register value of host controller status * @@ -303,6 +336,36 @@ static inline void ufshcd_free_hba_memory(struct ufs_hba *hba) } /** + * ufshcd_is_valid_req_rsp - checks if controller TR response is valid + * @ucd_rsp_ptr: pointer to response UPIU + * + * This function checks the response UPIU for valid transaction type in + * response field + * Returns 0 on success, non-zero on failure + */ +static inline int +ufshcd_is_valid_req_rsp(struct utp_upiu_rsp *ucd_rsp_ptr) +{ + return ((be32_to_cpu(ucd_rsp_ptr->header.dword_0) >> 24) == + UPIU_TRANSACTION_RESPONSE) ? 0 : + (DID_ERROR << 16 | + COMMAND_COMPLETE << 8); +} + +/** + * ufshcd_get_rsp_upiu_result - Get the result from response UPIU + * @ucd_rsp_ptr: pointer to response UPIU + * + * This function gets the response status and scsi_status from response UPIU + * Returns the response result code. + */ +static inline int +ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr) +{ + return be32_to_cpu(ucd_rsp_ptr->header.dword_1) & MASK_RSP_UPIU_RESULT; +} + +/** * ufshcd_config_int_aggr - Configure interrupt aggregation values * currently there is no use case where we want to configure * interrupt aggregation dynamically. So to configure interrupt @@ -342,6 +405,34 @@ static inline void ufshcd_hba_stop(struct ufs_hba *hba) } /** + * ufshcd_send_command - Send SCSI or device management commands + * @hba: per adapter instance + * @task_tag: Task tag of the command + */ +static inline +void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag) +{ + hba->outstanding_reqs |= (1 << task_tag); + writel((1 << task_tag), + (UFSHCD_MMIO_BASE + REG_UTP_TRANSFER_REQ_DOOR_BELL)); +} + +/** + * ufshcd_copy_sense_data - Copy sense data in case of check condition + * @lrb - pointer to local reference block + */ +static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp) +{ + int len; + if (lrbp->sense_buffer != NULL) { + len = be16_to_cpu(lrbp->ucd_rsp_ptr->sense_data_len); + memcpy(lrbp->sense_buffer, + lrbp->ucd_rsp_ptr->sense_data, + min_t(int, len, SCSI_SENSE_BUFFERSIZE)); + } +} + +/** * ufshcd_hba_capabilities - Read controller capabilities * @hba: per adapter instance */ @@ -385,6 +476,42 @@ ufshcd_send_uic_command(struct ufs_hba *hba, struct uic_command *uic_cmnd) } /** + * ufshcd_map_sg - Map scatter-gather list to prdt + * @lrbp - pointer to local reference block + */ +static void ufshcd_map_sg(struct ufshcd_lrb *lrbp) +{ + struct ufshcd_sg_entry *prd_table; + struct scatterlist *sg; + struct scsi_cmnd *cmd; + int sg_segments; + int i; + + cmd = lrbp->cmd; + sg_segments = scsi_dma_map(cmd); + + BUG_ON(sg_segments < 0); + + if (sg_segments) { + lrbp->utr_descriptor_ptr->prd_table_length = + cpu_to_le16((u16) (sg_segments)); + + prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr; + + scsi_for_each_sg(cmd, sg, sg_segments, i) { + prd_table[i].size = + cpu_to_le32(((u32) sg_dma_len(sg))-1); + prd_table[i].base_addr = + cpu_to_le32(sg->dma_address); + prd_table[i].upper_addr = + cpu_to_le32((sg->dma_address >> 32)); + } + } else { + lrbp->utr_descriptor_ptr->prd_table_length = 0; + } +} + +/** * ufshcd_int_config - enable/disable interrupts * @hba: per adapter instance * @option: interrupt option @@ -410,6 +537,124 @@ static void ufshcd_int_config(struct ufs_hba *hba, u32 option) } /** + * ufshcd_compose_upiu - form UFS Protocol Information Unit(UPIU) + * @hba: per adapter instance + * @lrb - pointer to local reference block + */ +static void ufshcd_compose_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp) +{ + struct utp_transfer_req_desc *req_desc; + struct utp_upiu_cmd *ucd_cmd_ptr; + u32 data_direction; + u32 upiu_flags; + + ucd_cmd_ptr = lrbp->ucd_cmd_ptr; + req_desc = lrbp->utr_descriptor_ptr; + + memset(ucd_cmd_ptr, 0, sizeof(struct utp_upiu_cmd)); + + switch (lrbp->command_type) { + case UTP_CMD_TYPE_SCSI: + if (DMA_FROM_DEVICE == lrbp->cmd->sc_data_direction) { + data_direction = UTP_DEVICE_TO_HOST; + upiu_flags = UPIU_CMD_FLAGS_READ; + } else if (DMA_TO_DEVICE == lrbp->cmd->sc_data_direction) { + data_direction = UTP_HOST_TO_DEVICE; + upiu_flags = UPIU_CMD_FLAGS_WRITE; + } else { + data_direction = UTP_NO_DATA_TRANSFER; + upiu_flags = 0; + } + + /* + * Transfer request desc header fields + * set interrupt bit if interrupt aggregation is disabled + */ + req_desc->header.dword_0 = cpu_to_le32(data_direction | + UTP_SCSI_COMMAND); + + /* + * assigning invalid value for command status. Controller + * updates OCS on command completion, with the command + * status + */ + req_desc->header.dword_2 = + cpu_to_le32(OCS_INVALID_COMMAND_STATUS); + + /* command descriptor fields */ + ucd_cmd_ptr->exp_data_transfer_len = + cpu_to_be32(lrbp->cmd->transfersize); + memcpy(ucd_cmd_ptr->cdb, lrbp->cmd->cmnd, + (min_t(unsigned short, + lrbp->cmd->cmd_len, + (unsigned short)MAX_CDB_SIZE))); + + ucd_cmd_ptr->header.dword_0 = + cpu_to_be32(UPIU_HEADER_DWORD(UPIU_TRANSACTION_COMMAND, + upiu_flags, + lrbp->lun, + lrbp->task_tag)); + ucd_cmd_ptr->header.dword_1 = + cpu_to_be32( + UPIU_HEADER_DWORD(UPIU_COMMAND_SET_TYPE_SCSI, + 0, + 0, + 0)); + + /* set command response to zero */ + memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp)); + case UTP_CMD_TYPE_DEV_MANAGE: + /* For query function implementation */ + break; + case UTP_CMD_TYPE_UFS: + /* For UFS native command implementation */ + break; + } /* end of switch, command_type */ +} + +/** + * ufshcd_queuecommand - main entry point for SCSI requests + * @cmd: command from SCSI Midlayer + * @done: call back function + * + * Retruns 0 for success, SCSI Midlayer specific error in case of failure + */ +static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) +{ + struct ufshcd_lrb *lrbp; + struct ufs_hba *hba; + unsigned long flags; + int tag; + + hba = (struct ufs_hba *) &host->hostdata[0]; + + tag = cmd->request->tag; + + if (UFSHCD_STATE_OPERATIONAL != hba->ufshcd_state) + return SCSI_MLQUEUE_HOST_BUSY; + + lrbp = &hba->lrb[tag]; + + lrbp->cmd = cmd; + lrbp->sense_bufflen = SCSI_SENSE_BUFFERSIZE; + lrbp->sense_buffer = cmd->sense_buffer; + lrbp->task_tag = tag; + lrbp->lun = cmd->device->lun; + + lrbp->command_type = UTP_CMD_TYPE_SCSI; + + /* form UPIU before issuing the command */ + ufshcd_compose_upiu(hba, lrbp); + ufshcd_map_sg(lrbp); + + /* issue command to the controller */ + spin_lock_irqsave(host->host_lock, flags); + ufshcd_send_command(hba, tag); + spin_unlock_irqrestore(host->host_lock, flags); + return 0; +} + +/** * ufshcd_memory_alloc - allocate memory for host memory space data structures * @hba: per adapter instance * @@ -680,6 +925,7 @@ static int ufshcd_make_hba_operational(struct ufs_hba *hba) ufshcd_config_int_aggr(hba, INT_AGGR_CONFIG); hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; + scsi_scan_host(hba->host); return 0; } @@ -763,6 +1009,190 @@ static int ufshcd_initialize_hba(struct ufs_hba *hba) } /** + * ufshcd_slave_alloc - handle initial scsi devie configurations + * @sdev: pointer to scsi device + * + * Returns success + */ +static int ufshcd_slave_alloc(struct scsi_device *sdev) +{ + struct ufs_hba *hba; + + hba = (struct ufs_hba *)sdev->host->hostdata; + sdev->tagged_supported = 1; + scsi_set_tag_type(sdev, MSG_SIMPLE_TAG); + scsi_activate_tcq(sdev, hba->nutrs); + + return 0; +} + +/** + * ufshcd_slave_destroy - remove scsi device configurations + * @sdev: pointer to scsi device + */ +static void ufshcd_slave_destroy(struct scsi_device *sdev) +{ + struct ufs_hba *hba; + + hba = (struct ufs_hba *)sdev->host->hostdata; + scsi_deactivate_tcq(sdev, hba->nutrs); +} + +/** + * ufshcd_scsi_cmd_status - Update SCSI command result based on scsi status + * @lrb: pointer to local reference block of completed command + * @scsi_status: SCSI command status + * + * Returns value base on SCSI command status + */ +static inline int +ufshcd_scsi_cmd_status(struct ufshcd_lrb *lrbp, int scsi_status) +{ + int result = 0; + + switch (scsi_status) { + case SAM_STAT_GOOD: + result |= DID_OK << 16 | + COMMAND_COMPLETE << 8 | + SAM_STAT_GOOD; + break; + case SAM_STAT_CHECK_CONDITION: + result |= DRIVER_SENSE << 24 | + COMMAND_COMPLETE << 8 | + SAM_STAT_CHECK_CONDITION; + ufshcd_copy_sense_data(lrbp); + break; + case SAM_STAT_BUSY: + result |= DID_BUS_BUSY << 16 | + SAM_STAT_BUSY; + break; + case SAM_STAT_TASK_SET_FULL: + result |= DID_OK << 16 | + COMMAND_COMPLETE << 8 | + SAM_STAT_TASK_SET_FULL; + break; + case SAM_STAT_TASK_ABORTED: + result |= DID_ABORT << 16 | + ABORT_TASK << 8 | + SAM_STAT_TASK_ABORTED; + default: + result |= DID_ERROR << 16; + break; + } /* end of switch */ + + return result; +} + +/** + * ufshcd_transfer_rsp_status - Get overall status of the response + * @lrb: pointer to local reference block of completed command + * + * Returns result of the command to notify SCSI midlayer + */ +static inline int ufshcd_transfer_rsp_status(struct ufshcd_lrb *lrbp) +{ + int result = 0; + int scsi_status; + int ocs; + + /* overall command status of utrd */ + ocs = ufshcd_get_tr_ocs(lrbp); + + switch (ocs) { + case OCS_SUCCESS: + + /* check if the returned transfer response is valid */ + result = ufshcd_is_valid_req_rsp(lrbp->ucd_rsp_ptr); + if (result) { + pr_err(UFSHCD ":Invalid Response\n"); + break; + } + + /* + * get the response UPIU result to extract + * the SCSI command status + */ + result = ufshcd_get_rsp_upiu_result(lrbp->ucd_rsp_ptr); + + /* + * get the result based on SCSI status response + * to notify the SCSI midlayer of the command status + */ + scsi_status = result & MASK_SCSI_STATUS; + result = ufshcd_scsi_cmd_status(lrbp, scsi_status); + break; + case OCS_INVALID_CMD_TABLE_ATTR: + result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8; + break; + case OCS_INVALID_PRDT_ATTR: + result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8; + break; + case OCS_MISMATCH_DATA_BUF_SIZE: + result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8; + break; + case OCS_MISMATCH_RESP_UPIU_SIZE: + result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8; + break; + case OCS_PEER_COMM_FAILURE: + result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8; + break; + case OCS_ABORTED: + result |= DID_ABORT << 16 | ABORT_TASK << 8; + break; + case OCS_FATAL_ERROR: + result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8; + break; + default: + /* should not come here */ + result |= DID_ERROR << 16 | COMMAND_COMPLETE << 8; + pr_err(UFSHCD ":Invalid OCS from controller\n"); + break; + } /* end of switch */ + + return result; +} + +/** + * ufshcd_transfer_req_compl - handle SCSI and query command completion + * @hba: per adapter instance + */ +static void ufshcd_transfer_req_compl(struct ufs_hba *hba) +{ + struct ufshcd_lrb *lrb; + u32 completed_reqs; + u32 tr_doorbell; + int result; + int index; + + lrb = hba->lrb; + tr_doorbell = + readl(hba->mmio_base + REG_UTP_TRANSFER_REQ_DOOR_BELL); + completed_reqs = tr_doorbell ^ hba->outstanding_reqs; + + /* clear completed commands from outstanding_reqs */ + hba->outstanding_reqs ^= completed_reqs; + + for (index = 0; index < hba->nutrs; index++) { + if (completed_reqs & (1 << index)) { + + result = ufshcd_transfer_rsp_status(&lrb[index]); + + if (NULL != lrb[index].cmd) { + scsi_dma_unmap(lrb[index].cmd); + lrb[index].cmd->result = result; + lrb[index].cmd->scsi_done(lrb[index].cmd); + + /* Mark completed command as NULL in LRB */ + lrb[index].cmd = NULL; + } + } /* end of if */ + } /* end of for */ + + /* Reset interrupt aggregation counters */ + ufshcd_config_int_aggr(hba, INT_AGGR_RESET); +} + +/** * ufshcd_uic_cc_handler - handle UIC command completion * @work: pointer to a work queue structure * @@ -793,6 +1223,9 @@ static void ufshcd_sl_intr(struct ufs_hba *hba, u32 intr_status) { if (intr_status & UIC_COMMAND_COMPL) schedule_work(&hba->uic_workq); + + if (intr_status & UTP_TRANSFER_REQ_COMPL) + ufshcd_transfer_req_compl(hba); } /** @@ -830,7 +1263,13 @@ static struct scsi_host_template ufshcd_driver_template = { .module = THIS_MODULE, .name = UFSHCD, .proc_name = UFSHCD, + .queuecommand = ufshcd_queuecommand, + .slave_alloc = ufshcd_slave_alloc, + .slave_destroy = ufshcd_slave_destroy, .this_id = -1, + .sg_tablesize = SG_ALL, + .cmd_per_lun = UFSHCD_CMD_PER_LUN, + .can_queue = UFSHCD_CAN_QUEUE }; /** @@ -1003,6 +1442,7 @@ ufshcd_probe(struct pci_dev *pdev, const struct pci_device_id *id) host->max_lun = UFSHCD_MAX_LUNS; host->max_channel = UFSHCD_MAX_CHANNEL; host->unique_id = host->host_no; + host->max_cmd_len = MAX_CDB_SIZE; /* Initialize work queues */ INIT_WORK(&hba->uic_workq, ufshcd_uic_cc_handler); @@ -1014,6 +1454,13 @@ ufshcd_probe(struct pci_dev *pdev, const struct pci_device_id *id) goto out_lrb_free; } + /* Enable scsi tag mapping */ + err = scsi_init_shared_tag_map(host, host->can_queue); + if (err) { + dev_err(&pdev->dev, "init shared queue failed\n"); + goto out_free_irq; + } + pci_set_drvdata(pdev, hba); err = scsi_add_host(host, &pdev->dev);