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SubjectRe: [PATCH 2/4] [SCSI] ufshcd: UFS UTP Transfer requests handling
From
On 2 February 2012 10:27, Vinayak Holikatti <vinholikatti@gmail.com> wrote:
> From: Santosh Yaraganavi <santoshsy@gmail.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@gmail.com>
> Signed-off-by: Vinayak Holikatti <vinholikatti@gmail.com>
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
> Reviewed-by: Saugata Das <saugata.das@linaro.org>
> Reviewed-by: Vishak G <vishak.g@samsung.com>
> Reviewed-by: Girish K S <girish.shivananjappa@linaro.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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