Re: [PATCH 2/4] [SCSI] ufshcd: UFS UTP Transfer requests handling
From: Santosh Y
Date: Sun Feb 05 2012 - 09:36:25 EST
On Sun, Feb 5, 2012 at 6:21 PM, Namjae Jeon <linkinjeon@xxxxxxxxx> wrote:
> 2012/2/2 Vinayak Holikatti <vinholikatti@xxxxxxxxx>:
>> From: Santosh Yaraganavi <santoshsy@xxxxxxxxx>
>>
>> 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@xxxxxxxxx>
>> Signed-off-by: Vinayak Holikatti <vinholikatti@xxxxxxxxx>
>> Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
>> Reviewed-by: Saugata Das <saugata.das@xxxxxxxxxx>
>> Reviewed-by: Vishak G <vishak.g@xxxxxxxxxxx>
>> Reviewed-by: Girish K S <girish.shivananjappa@xxxxxxxxxx>
>> ---
>> 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;
>> + } 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;
> I think that we can add some enum value for like UTP_NO_DATA_TRANSFER.
We'll add a comment.
>> + }
>> +
>> + /*
>> + * 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)));
> Is there any reason type casting for MAX_CDB_SIZE ?
No, we'll remove the type casting.
>
>> +
>> + 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));
> Why did you set ucd_rsp_ptr to zero afte adding value ?
We are assigning values to ucd_cmd_ptr(command) and memset is being
done on ucd_rsp_ptr(response).
> And plz add break here.
ok, we'll update it.
>> + 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;
> plz add break here also.
ok, we'll update it.
>> + 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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Thanks,
~Santosh
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