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Message-ID: <CAGxe1ZEd_9zMpnfDdWByffKaVWT7z=qUYjJ+HZQFwj=sp6JT9g@mail.gmail.com>
Date: Thu, 9 Feb 2012 01:18:55 +0530
From: Girish K S <girish.shivananjappa@...aro.org>
To: Vinayak Holikatti <vinholikatti@...il.com>
Cc: James.Bottomley@...senpartnership.com, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org, patches@...aro.org,
linux-samsung-soc@...r.kernel.org, saugata.das@...aro.org,
arnd@...db.de, venkat@...aro.org, vishak.g@...sung.com,
k.rajesh@...sung.com, yejin.moon@...sung.com,
Santosh Yaraganavi <santoshsy@...il.com>
Subject: Re: [PATCH 2/4] [SCSI] ufshcd: UFS UTP Transfer requests handling
On 2 February 2012 10:27, Vinayak Holikatti <vinholikatti@...il.com> wrote:
> From: Santosh Yaraganavi <santoshsy@...il.com>
>
> 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 <santoshsy@...il.com>
> Signed-off-by: Vinayak Holikatti <vinholikatti@...il.com>
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> Reviewed-by: Saugata Das <saugata.das@...aro.org>
> Reviewed-by: Vishak G <vishak.g@...sung.com>
> Reviewed-by: Girish K S <girish.shivananjappa@...aro.org>
> ---
> 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 <scsi/scsi.h>
> #include <scsi/scsi_cmnd.h>
> #include <scsi/scsi_host.h>
> +#include <scsi/scsi_tcq.h>
> #include <scsi/scsi_dbg.h>
>
> #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;
For a read operation the Spec mentions that flag.F bit should be set
to inform the target that current upiu is the final upiu.
> + } else if (DMA_TO_DEVICE == lrbp->cmd->sc_data_direction) {
> + data_direction = UTP_HOST_TO_DEVICE;
> + upiu_flags = UPIU_CMD_FLAGS_WRITE;
During write at some point of time flag.F bit has to be set to tell
the target about the last data out upiu.
> + } 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);
updating expected data transfer length can be ignored if flag.R/W is not set
> + memcpy(ucd_cmd_ptr->cdb, lrbp->cmd->cmnd,
> + (min_t(unsigned short,
> + lrbp->cmd->cmd_len,
> + (unsigned short)MAX_CDB_SIZE)));
casting is unnecessary as the macro min_t itself will assign this
value to a unsigned integer
> +
> + 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));
the macro UPIU_COMMAND_SET_TYPE_SCSI is unnecessary. the
lrbp->command_type can be used. One can be deleted
> +
> + /* set command response to zero */
> + memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
The break is missing here. crucial once the below case is populated
with valid dev management info
> + 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);
> --
> 1.7.5.4
>
--
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