dasd_3990_erp.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

	} else {
		/* all other data checks */
		DASD_MESSAGE (KERN_DEBUG, device, "%s",
                              "Uncorrectable data check with retry count "
                              "exhausted...");

		erp = dasd_3990_erp_action_5 (erp);
	}

	return erp;

} /* end dasd_3990_erp_data_check */

/*
 * DASD_3990_ERP_OVERRUN
 *
 * DESCRIPTION
 *   Handles 24 byte 'Overrun' error.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_overrun (ccw_req_t *erp,
		       char      *sense)
{

	dasd_device_t *device = erp->device;

	erp->function = dasd_3990_erp_overrun;

        DASD_MESSAGE (KERN_DEBUG, device, "%s",
                      "Overrun - service overrun or overrun"
                      " error requested by channel");

        erp = dasd_3990_erp_action_5 (erp);

	return erp;

} /* end dasd_3990_erp_overrun */

/*
 * DASD_3990_ERP_INV_FORMAT
 *
 * DESCRIPTION
 *   Handles 24 byte 'Invalid Track Format' error.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_inv_format (ccw_req_t *erp,
			  char      *sense)
{

	dasd_device_t *device = erp->device;

	erp->function = dasd_3990_erp_inv_format;

	if (sense[2] & SNS2_ENV_DATA_PRESENT) {

		DASD_MESSAGE (KERN_DEBUG, device, "%s",
                              "Track format error when destaging or "
                              "staging data");

		dasd_3990_handle_env_data (erp,
                                           sense);

		erp = dasd_3990_erp_action_4 (erp,
					      sense);

	} else {
		DASD_MESSAGE (KERN_ERR, device, "%s",
                              "Invalid Track Format - Fatal error should have "
                              "been handled within the interrupt handler");

                erp= dasd_3990_erp_cleanup (erp,
                                            CQR_STATUS_FAILED);
        }

	return erp;

} /* end dasd_3990_erp_inv_format */

/*
 * DASD_3990_ERP_EOC
 *
 * DESCRIPTION
 *   Handles 24 byte 'End-of-Cylinder' error.
 *
 * PARAMETER
 *   erp                already added default erp
 * RETURN VALUES
 *   erp                pointer to original (failed) cqr.
 */
ccw_req_t *
dasd_3990_erp_EOC (ccw_req_t *default_erp,
		   char      *sense)
{

	dasd_device_t *device = default_erp->device;

        DASD_MESSAGE (KERN_ERR, device, "%s",
                      "End-of-Cylinder - must never happen");

        /* implement action 7 - BUG */
        return dasd_3990_erp_cleanup (default_erp,
                                      CQR_STATUS_FAILED);

} /* end dasd_3990_erp_EOC */

/*
 * DASD_3990_ERP_ENV_DATA
 *
 * DESCRIPTION
 *   Handles 24 byte 'Environmental-Data Present' error.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_env_data (ccw_req_t *erp,
			char      *sense)
{

	dasd_device_t *device = erp->device;

	erp->function = dasd_3990_erp_env_data;

        DASD_MESSAGE (KERN_DEBUG, device, "%s",
                      "Environmental data present");

        dasd_3990_handle_env_data (erp,
                                   sense);

        /* don't retry on disabled interface */
        if (sense[7] != 0x0F) {

                erp = dasd_3990_erp_action_4 (erp,
                                              sense);
        } else {

                erp = dasd_3990_erp_cleanup (erp,
                                             CQR_STATUS_IN_IO);
        }

	return erp;

} /* end dasd_3990_erp_env_data */

/*
 * DASD_3990_ERP_NO_REC
 *
 * DESCRIPTION
 *   Handles 24 byte 'No Record Found' error.
 *
 * PARAMETER
 *   erp                already added default ERP
 *              
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_no_rec (ccw_req_t *default_erp,
		      char      *sense)
{

	dasd_device_t *device = default_erp->device;

        DASD_MESSAGE (KERN_ERR, device, "%s",
                      "No Record Found - Fatal error should "
                      "have been handled within the interrupt handler");

        return dasd_3990_erp_cleanup (default_erp,
                                      CQR_STATUS_FAILED);

} /* end dasd_3990_erp_no_rec */

/*
 * DASD_3990_ERP_FILE_PROT
 *
 * DESCRIPTION
 *   Handles 24 byte 'File Protected' error.
 *   Note: Seek related recovery is not implemented because
 *         wee don't use the seek command yet.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_file_prot (ccw_req_t *erp)
{

	dasd_device_t *device = erp->device;

        DASD_MESSAGE (KERN_ERR, device, "%s",
                      "File Protected");

        return dasd_3990_erp_cleanup (erp,
                                      CQR_STATUS_FAILED);

} /* end dasd_3990_erp_file_prot */

/*
 * DASD_3990_ERP_INSPECT_24 
 *
 * DESCRIPTION
 *   Does a detailed inspection of the 24 byte sense data
 *   and sets up a related error recovery action.  
 *
 * PARAMETER
 *   sense              sense data of the actual error
 *   erp                pointer to the currently created default ERP
 *
 * RETURN VALUES
 *   erp                pointer to the (addtitional) ERP
 */
ccw_req_t *
dasd_3990_erp_inspect_24 (ccw_req_t *erp,
                          char      *sense)
{

	ccw_req_t *erp_filled = NULL;

	/* Check sense for ....    */
	/* 'Command Reject'        */
	if ((erp_filled == NULL) &&
	    (sense[0] & SNS0_CMD_REJECT)) {
		erp_filled = dasd_3990_erp_com_rej (erp,
						    sense);
	}
	/* 'Intervention Required' */
	if ((erp_filled == NULL) &&
	    (sense[0] & SNS0_INTERVENTION_REQ)) {
		erp_filled = dasd_3990_erp_int_req (erp);
	}
	/* 'Bus Out Parity Check'  */
	if ((erp_filled == NULL) &&
	    (sense[0] & SNS0_BUS_OUT_CHECK)) {
		erp_filled = dasd_3990_erp_bus_out (erp);
	}
	/* 'Equipment Check'       */
	if ((erp_filled == NULL) &&
	    (sense[0] & SNS0_EQUIPMENT_CHECK)) {
		erp_filled = dasd_3990_erp_equip_check (erp,
							sense);
	}
	/* 'Data Check'            */
	if ((erp_filled == NULL) &&
	    (sense[0] & SNS0_DATA_CHECK)) {
		erp_filled = dasd_3990_erp_data_check (erp,
						       sense);
	}
	/* 'Overrun'               */
	if ((erp_filled == NULL) &&
	    (sense[0] & SNS0_OVERRUN)) {
		erp_filled = dasd_3990_erp_overrun (erp,
						    sense);
	}
	/* 'Invalid Track Format'  */
	if ((erp_filled == NULL) &&
	    (sense[1] & SNS1_INV_TRACK_FORMAT)) {
		erp_filled = dasd_3990_erp_inv_format (erp,
						       sense);
	}
	/* 'End-of-Cylinder'       */
	if ((erp_filled == NULL) &&
	    (sense[1] & SNS1_EOC)) {
		erp_filled = dasd_3990_erp_EOC (erp,
						sense);
	}
	/* 'Environmental Data'    */
	if ((erp_filled == NULL) &&
	    (sense[2] & SNS2_ENV_DATA_PRESENT)) {
		erp_filled = dasd_3990_erp_env_data (erp,
						     sense);
	}
	/* 'No Record Found'       */
	if ((erp_filled == NULL) &&
	    (sense[1] & SNS1_NO_REC_FOUND)) {
		erp_filled = dasd_3990_erp_no_rec (erp,
						   sense);
	}
	/* 'File Protected'        */
	if ((erp_filled == NULL) &&
	    (sense[1] & SNS1_FILE_PROTECTED)) {
		erp_filled = dasd_3990_erp_file_prot (erp);
	}
	/* other (unknown) error - do default ERP */
	if (erp_filled == NULL) {

		erp_filled = erp;	
	}

	return erp_filled;

} /* END dasd_3990_erp_inspect_24 */

/*
 ***************************************************************************** 
 * 32 byte sense ERP functions (only)
 ***************************************************************************** 
 */

/*
 * DASD_3990_ERPACTION_10_32 
 *
 * DESCRIPTION
 *   Handles 32 byte 'Action 10' of Single Program Action Codes.
 *   Just retry and if retry doesn't work, return with error.
 *
 * PARAMETER
 *   erp                current erp_head
 *   sense              current sense data 
 * RETURN VALUES
 *   erp                modified erp_head
 */
ccw_req_t *
dasd_3990_erp_action_10_32 (ccw_req_t *erp,
                            char      *sense)
{

	dasd_device_t *device = erp->device;

        erp->retries  = 256;
        erp->function = dasd_3990_erp_action_10_32;

	DASD_MESSAGE (KERN_DEBUG, device, "%s",
                      "Perform logging requested");

	return erp;

} /* end dasd_3990_erp_action_10_32 */

/*
 * DASD_3990_ERP_ACTION_1B_32
 *
 * DESCRIPTION
 *   Handles 32 byte 'Action 1B' of Single Program Action Codes.
 *   A write operation could not be finished because of an unexpected 
 *   condition.
 *   The already created 'default erp' is used to get the link to 
 *   the erp chain, but it can not be used for this recovery 
 *   action because it contains no DE/LO data space.
 *
 * PARAMETER
 *   default_erp        already added default erp.
 *   sense              current sense data 
 *
 * RETURN VALUES
 *   erp                new erp or 
 *                      default_erp in case of imprecise ending or error
 */
ccw_req_t *
dasd_3990_erp_action_1B_32 (ccw_req_t *default_erp,
                            char      *sense)
{

	dasd_device_t  *device = default_erp->device;
        __u32          cpa     = 0;
        ccw_req_t      *cqr;
	ccw_req_t      *erp;
	DE_eckd_data_t *DE_data;
	char           *LO_data;   /* LO_eckd_data_t */
        ccw1_t         *ccw;

	DASD_MESSAGE (KERN_DEBUG, device, "%s",
                      "Write not finished because of unexpected condition");
        
        default_erp->function = dasd_3990_erp_action_1B_32;

        /* determine the original cqr */
        cqr = default_erp; 

        while (cqr->refers != NULL){
                cqr = cqr->refers;
        }

        /* for imprecise ending just do default erp */
        if (sense[1] & 0x01) {

                DASD_MESSAGE (KERN_DEBUG, device, "%s",
                              "Imprecise ending is set - just retry");