/* 
 * File...........: linux/drivers/s390/block/dasd_3990_erp.c
 * Author(s)......: Horst  Hummel    <Horst.Hummel@de.ibm.com> 
 *                  Holger Smolinski <Holger.Smolinski@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000, 2001
 */

#include <asm/ccwcache.h>
#include <asm/idals.h>
#include <asm/dasd.h>
#include <asm/s390io.h>
#include <linux/timer.h>
#include "dasd_eckd.h"
#include "dasd_3990_erp.h"

#ifdef PRINTK_HEADER
#undef PRINTK_HEADER
#endif				/* PRINTK_HEADER */
#define PRINTK_HEADER "dasd_erp(3990): "

/*
 ***************************************************************************** 
 * SECTION DEBUG ROUTINES
 ***************************************************************************** 
 */
#ifdef ERP_DEBUG
void
log_erp_chain (ccw_req_t *cqr,
               int       caller,
               __u32     cpa)
{

        ccw_req_t     *loop_cqr = cqr;
	dasd_device_t *device   = cqr->device;

        char    *page = (char *)get_free_page(GFP_ATOMIC);
        int     len = 0;
        int     i;
        char    *nl, 
                *end_cqr,
                *begin, 
                *end;

        if ( page == NULL ) {
                printk (KERN_WARNING PRINTK_HEADER
                        "No memory to dump ERP chain\n");
                return;
        }        
                        
        while (loop_cqr != NULL) {
                
                memset (page, 0, 4096);
                len = 0;

                len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                 "device %04X on irq %d: (%s) ERP chain report for req: %p\n",
                                 device->devinfo.devno,
                                 device->devinfo.irq,
                                 caller == 0 ? "EXAMINE" : "ACTION",
                                 loop_cqr);
                
                nl      = (char *) loop_cqr;
                end_cqr = nl + sizeof (ccw_req_t); 

                while (nl < end_cqr) {

                        len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                         "%p: %02x%02x%02x%02x %02x%02x%02x%02x "
                                         "%02x%02x%02x%02x %02x%02x%02x%02x\n",
                                         nl,
                                         nl[0], nl[1], nl[2], nl[3],
                                         nl[4], nl[5], nl[6], nl[7],
                                         nl[8], nl[9], nl[10], nl[11],
                                         nl[12], nl[13], nl[14], nl[15]);
                        nl +=16;
                }        
                
                nl  = (char *) loop_cqr->cpaddr;

                if (loop_cqr->cplength > 40 ) { /* log only parts of the CP */

                        len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                         "Start of channel program:\n");

                        for (i = 0; i < 20; i += 2) { 

                                len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                                 "%p: %02x%02x%02x%02x %02x%02x%02x%02x "
                                                 "%02x%02x%02x%02x %02x%02x%02x%02x\n",
                                                 nl,
                                                 nl[0], nl[1], nl[2], nl[3],
                                                 nl[4], nl[5], nl[6], nl[7],
                                                 nl[8], nl[9], nl[10], nl[11],
                                                 nl[12], nl[13], nl[14], nl[15]);
                                
                                nl += 16;
                        }
                        
                        len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                         "End of channel program:\n");
                        
                        nl  = (char *) loop_cqr->cpaddr;
                        nl  += ((loop_cqr->cplength - 10) * 8);
                        
                        for (i = 0; i < 20; i += 2) { 
                                
                                len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                                 "%p: %02x%02x%02x%02x %02x%02x%02x%02x "
                                                 "%02x%02x%02x%02x %02x%02x%02x%02x\n",
                                                 nl,
                                                 nl[0], nl[1], nl[2], nl[3],
                                                 nl[4], nl[5], nl[6], nl[7],
                                                 nl[8], nl[9], nl[10], nl[11],
                                                 nl[12], nl[13], nl[14], nl[15]);
                                
                                nl += 16;
                        }
                        
                } else { /* log the whole CP */
                        
                        len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                         "Channel program (complete):\n");
                        
                        for (i = 0; i < (loop_cqr->cplength + 4); i += 2) { 
                                
                                len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                                 "%p: %02x%02x%02x%02x %02x%02x%02x%02x "
                                                 "%02x%02x%02x%02x %02x%02x%02x%02x\n",
                                                 nl,
                                                 nl[0], nl[1], nl[2], nl[3],
                                                 nl[4], nl[5], nl[6], nl[7],
                                                 nl[8], nl[9], nl[10], nl[11],
                                                 nl[12], nl[13], nl[14], nl[15]);
                                
                                nl += 16;
                        }
                }

                /* log bytes arround failed CCW if not already done */ 
                begin = (char *) loop_cqr->cpaddr;
                end   = begin + ((loop_cqr->cplength+4) * 8);
                nl = (void *)cpa;

                if (loop_cqr == cqr) {  /* log only once */
 
                        if ((loop_cqr->cplength > 40) ||     /* not whole CP was logged or */
                            ((nl < begin ) &&                /* CCW is outside logged CP   */
                             (nl > end   )          )   ) {
                        
                                nl -= 10*8;     /* start some bytes before */          
                                
                                len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                                 "Failed CCW (%p) (area):\n",
                                                 (void *)cpa);
                                
                                for (i = 0; i < 20; i += 2) { 
                                        
                                        len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                                         "%p: %02x%02x%02x%02x %02x%02x%02x%02x "
                                                         "%02x%02x%02x%02x %02x%02x%02x%02x\n",
                                                         nl,
                                                         nl[0], nl[1], nl[2], nl[3],
                                                         nl[4], nl[5], nl[6], nl[7],
                                                         nl[8], nl[9], nl[10], nl[11],
                                                         nl[12], nl[13], nl[14], nl[15]);
                                        
                                        nl += 16;
                                }
                                
                        } else {
                                
                                len += sprintf ( page + len, KERN_WARNING PRINTK_HEADER 
                                                 "Failed CCW (%p) already logged\n",
                                                 (void *)cpa);
                        }
                }

                printk ("%s", page);
                loop_cqr = loop_cqr->refers;
        }
        
        free_page ((unsigned long) page);

} /* end log_erp_chain */
#endif /* ERP_DEBUG */


/*
 ***************************************************************************** 
 * SECTION ERP EXAMINATION
 ***************************************************************************** 
 */

/*
 * DASD_3990_ERP_EXAMINE_24 
 *
 * DESCRIPTION
 *   Checks only for fatal (unrecoverable) error. 
 *   A detailed examination of the sense data is done later outside
 *   the interrupt handler.
 *
 *   Each bit configuration leading to an action code 2 (Exit with
 *   programming error or unusual condition indication)
 *   are handled as fatal errorīs.
 * 
 *   All other configurations are handled as recoverable errors.
 *
 * RETURN VALUES
 *   dasd_era_fatal     for all fatal (unrecoverable errors)
 *   dasd_era_recover   for all others.
 */
dasd_era_t
dasd_3990_erp_examine_24 (char *sense)
{

	/* check for 'Command Recejct' which is always a fatal error  */
	if (sense[0] & SNS0_CMD_REJECT) {
		if (sense[2] & SNS2_ENV_DATA_PRESENT) {
			return dasd_era_recover;
		} else {
			return dasd_era_fatal;
		}
	}
	/* check for 'Invalid Track Format'                           */
	if (sense[1] & SNS1_INV_TRACK_FORMAT) {
		if (sense[2] & SNS2_ENV_DATA_PRESENT) {
			return dasd_era_recover;
		} else {
			return dasd_era_fatal;
		}
	}
	/* check for 'No Record Found'                                */
	if (sense[1] & SNS1_NO_REC_FOUND) {
            return dasd_era_fatal;
	}
	/* return recoverable for all others                          */
	return dasd_era_recover;

} /* END dasd_3990_erp_examine_24 */

/*
 * DASD_3990_ERP_EXAMINE_32 
 *
 * DESCRIPTION
 *   Checks only for fatal/no/recoverable error. 
 *   A detailed examination of the sense data is done later outside
 *   the interrupt handler.
 *
 * RETURN VALUES
 *   dasd_era_none      no error 
 *   dasd_era_fatal     for all fatal (unrecoverable errors)
 *   dasd_era_recover   for recoverable others.
 */
dasd_era_t
dasd_3990_erp_examine_32 (char *sense)
{

	switch (sense[25]) {
	case 0x00:
		return dasd_era_none;
	case 0x01:
		return dasd_era_fatal;
	default:
		return dasd_era_recover;
	}

}				/* end dasd_3990_erp_examine_32 */

/*
 * DASD_3990_ERP_EXAMINE 
 *
 * DESCRIPTION
 *   Checks only for fatal/no/recover error. 
 *   A detailed examination of the sense data is done later outside
 *   the interrupt handler.
 *
 *   The logic is based on the 'IBM 3990 Storage Control  Reference' manual
 *   'Chapter 7. Error Recovery Procedures'.
 *
 * RETURN VALUES
 *   dasd_era_none      no error 
 *   dasd_era_fatal     for all fatal (unrecoverable errors)
 *   dasd_era_recover   for all others.
 */
dasd_era_t
dasd_3990_erp_examine (ccw_req_t *cqr, 
                       devstat_t *stat)
{

	char       *sense = stat->ii.sense.data;
        dasd_era_t era    = dasd_era_recover;

	/* check for successful execution first */
	if (stat->cstat == 0x00 &&
	    stat->dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
		return dasd_era_none;

	/* distinguish between 24 and 32 byte sense data */
	if (sense[27] & DASD_SENSE_BIT_0) {

		/* examine the 24 byte sense data */
		era = dasd_3990_erp_examine_24 (sense);

	} else {

		/* examine the 32 byte sense data */
		era = dasd_3990_erp_examine_32 (sense);

	} /* end distinguish between 24 and 32 byte sense data */

#ifdef ERP_DEBUG
        if (era == dasd_era_fatal) {

                log_erp_chain (cqr, 
                               0, 
                               stat->cpa);
        }
#endif /* ERP_DEBUG */
        
        return era;

} /* END dasd_3990_erp_examine */

/*
 ***************************************************************************** 
 * SECTION ERP HANDLING
 ***************************************************************************** 
 */
/*
 ***************************************************************************** 
 * 24 and 32 byte sense ERP functions
 ***************************************************************************** 
 */

/*
 * DASD_3990_ERP_BLOCK_QUEUE 
 *
 * DESCRIPTION
 *   Block the given device request queue to prevent from further
 *   processing until the started timer has expired or an related
 *   interrupt was received.
 *
 *  PARAMETER
 *   erp                request to be blocked
 *   expires            time to wait until restart (in seconds) 
 *
 * RETURN VALUES
 *   void               
 */
void
dasd_3990_erp_block_queue (ccw_req_t     *erp,
                           unsigned long expires)
{

	dasd_device_t *device = erp->device;

        DASD_MESSAGE (KERN_INFO, device,
                      "blocking request queue for %is",
                      (int) expires);

        check_then_set (&erp->status,
                        CQR_STATUS_ERROR,
                        CQR_STATUS_PENDING);

        /* restart queue after some time */
        device->timer.function = dasd_3990_erp_restart_queue; 
        device->timer.data = (unsigned long) erp;
        device->timer.expires = jiffies + (expires * HZ);
        add_timer(&device->timer); 

} /* end dasd_3990_erp_block_queue */ 

/*
 * DASD_3990_ERP_RESTART_QUEUE 
 *
 * DESCRIPTION
 *   Restarts request currently in status PENDING.
 *   This has to be done if either an related interrupt has received, or 
 *   a timer has expired.
 *   
 *
 *  PARAMETER
 *   erp                pointer to the PENDING ERP
 *
 * RETURN VALUES
 *   void               
 *
 */
void
dasd_3990_erp_restart_queue (unsigned long erp)
{
        ccw_req_t     *cqr    = (void *) erp;
	dasd_device_t *device = cqr->device;
	unsigned long flags;
        
        /* get the needed locks to modify the request queue */
	s390irq_spin_lock_irqsave (device->devinfo.irq, 
                                   flags);

        /* 'restart' the device queue */
        if (cqr->status == CQR_STATUS_PENDING){
                
                DASD_MESSAGE (KERN_INFO, device,
                              "%s",
                              "request queue restarted by MIH");

                check_then_set (&cqr->status,
                                CQR_STATUS_PENDING,
                                CQR_STATUS_QUEUED);
        }

        /* release the lock */
        s390irq_spin_unlock_irqrestore (device->devinfo.irq, 
                                        flags);

        dasd_schedule_bh(device);

} /* end dasd_3990_erp_restart_queue */

#ifdef ERP_FULL_ERP
/*
 * DASD_3990_ERP_INT_REQ 
 *
 * DESCRIPTION
 *   Handles 'Intervention Required' error.
 *   This means either device offline or not installed.
 *
 * PARAMETER
 *   erp                current erp
 * RETURN VALUES
 *   erp                modified erp
 */
ccw_req_t *
dasd_3990_erp_int_req (ccw_req_t *erp)
{
	dasd_device_t *device = erp->device;

        /* first time set initial retry counter and erp_function */
        if (erp->function != dasd_3990_erp_int_req) {
                erp->retries  = 256;
                erp->function = dasd_3990_erp_int_req;
        }

        /* issue a message and wait for 'device ready' interrupt */
        DASD_MESSAGE (KERN_WARNING, device,
                      "%s",
                      "is offline or not installed - "
                      "INTERVENTION REQUIRED!!\n");

        dasd_3990_erp_block_queue (erp,
                                   60);

	return erp;

} /* end dasd_3990_erp_int_req */
#endif /* ERP_FULL_ERP */

/*
 * DASD_3990_ERP_ALTERNATE_PATH 
 *
 * DESCRIPTION
 *   Repeat the operation on a different channel path.
 *   If all alternate paths have been tried, the request is posted with a
 *   permanent error.
 *
 *  PARAMETER
 *   erp                pointer to the current ERP
 *
 * RETURN VALUES
 *   erp                modified pointer to the ERP
 *
 */
void
dasd_3990_erp_alternate_path (ccw_req_t *erp)
{

	dasd_device_t *device = erp->device;
        int irq = device->devinfo.irq;

	/* dissable current channel path - this causes the use of an other 
	   channel path if there is one.. */

	DASD_MESSAGE (KERN_WARNING, device,
                      "disable lpu %x",
                      erp->dstat->lpum);

        /* try alternate valid path */
        erp->lpm     &= ~(erp->dstat->lpum);
        erp->options |= DOIO_VALID_LPM;		/* use LPM for DO_IO */

	if ((erp->lpm & ioinfo[irq]->opm) != 0x00) {

		DASD_MESSAGE (KERN_WARNING, device,
                              "try alternate lpm %x",
                              erp->lpm);

		/* reset status to queued to handle the request again... */
		check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_QUEUED);

                erp->retries = 1;
                
	} else {
         
                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",      
                              "No alternate channel path left -> "
                              "permanent error");
                
                /* post request with permanent error */
                check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_FAILED);

        }
        
} /* end dasd_3990_erp_alternate_path */

#ifdef ERP_FULL_ERP
/*
 * DASD_3990_ERP_DCTL
 *
 * DESCRIPTION
 *   Setup cqr to do the Diagnostic Control (DCTL) command with an 
 *   Inhibit Write subcommand (0x20) and the given modifier.
 *
 *  PARAMETER
 *   erp                pointer to the current ERP
 *   modifier           subcommand modifier
 *   
 * RETURN VALUES
 *   dctl_cqr           pointer to NEW dctl_cqr 
 *
 */
ccw_req_t *
dasd_3990_erp_DCTL (ccw_req_t *erp,
                    char      modifier)
{
	DCTL_data_t *DCTL_data;
        ccw1_t      *ccw;
        ccw_req_t   *dctl_cqr = dasd_alloc_request ((char *) &erp->magic,
                                                    1,
                                                    sizeof(DCTL_data_t));
        
	if (dctl_cqr == NULL) {
		BUG();
        }

	DCTL_data = dctl_cqr->data;

        DCTL_data->subcommand = 0x02; /* Inhibit Write */
        DCTL_data->modifier   = modifier;

	ccw = dctl_cqr->cpaddr;
	memset (ccw, 0, sizeof (ccw1_t));
        ccw->cmd_code = CCW_CMD_DCTL;
        ccw->count    = 4;
        set_normalized_cda(ccw, __pa (DCTL_data));

        dctl_cqr->function = dasd_3990_erp_DCTL;
        dctl_cqr->refers = erp;
        dctl_cqr->device = erp->device;
        dctl_cqr->magic = erp->magic;
        dctl_cqr->lpm = LPM_ANYPATH;
        dctl_cqr->expires = 5 * TOD_MIN;
        dctl_cqr->retries = 2;
	asm volatile ("STCK %0":"=m" (dctl_cqr->buildclk));

        dctl_cqr->status = CQR_STATUS_FILLED;

	return dctl_cqr;

} /* end dasd_3990_erp_DCTL */
#endif /* ERP_FULL_ERP */  

/*
 * DASD_3990_ERP_ACTION_1 
 *
 * DESCRIPTION
 *   Setup ERP to do the ERP action 1 (see Reference manual).
 *   Repeat the operation on a different channel path.
 *   If all alternate paths have been tried, the request is posted with a
 *   permanent error.
 *   Note: duplex handling is not implemented (yet).
 *
 *  PARAMETER
 *   erp                pointer to the current ERP
 *
 * RETURN VALUES
 *   erp                pointer to the ERP
 *
 */
ccw_req_t *
dasd_3990_erp_action_1 (ccw_req_t *erp)
{
        erp->function = dasd_3990_erp_action_1;

        dasd_3990_erp_alternate_path (erp);

	return erp;

} /* end dasd_3990_erp_action_1 */

/*
 * DASD_3990_ERP_ACTION_4 
 *
 * DESCRIPTION
 *   Setup ERP to do the ERP action 4 (see Reference manual).
 *   Set the current request to PENDING to block the CQR queue for that device
 *   until the state change interrupt appears.
 *   Use a timer (20 seconds) to retry the cqr if the interrupt is still missing.
 *
 *  PARAMETER
 *   sense              sense data of the actual error
 *   erp                pointer to the current ERP
 *
 * RETURN VALUES
 *   erp                pointer to the ERP
 *
 */
ccw_req_t *
dasd_3990_erp_action_4 (ccw_req_t *erp,
			char      *sense)
{
	dasd_device_t *device = erp->device;

        /* first time set initial retry counter and erp_function    */
        /* and retry once without waiting for state change pending  */
        /* interrupt (this enables easier enqueing of the cqr)      */
        if (erp->function != dasd_3990_erp_action_4) {
                erp->retries  = 255; 
                erp->function = dasd_3990_erp_action_4;

        } else {

                if (sense[25] & 0x1D) {	/* state change pending */
                        
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "waiting for state change pending "
                                      "int");
                        
                        dasd_3990_erp_block_queue (erp,
                                                   30);
                        
                } else {
                        /* no state change pending - retry */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "no state change pending - retry");
                        
                        check_then_set (&erp->status,
                                        CQR_STATUS_ERROR,
                                        CQR_STATUS_QUEUED);
                }
        }

	return erp;

} /* end dasd_3990_erp_action_4 */

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

#ifdef ERP_FULL_ERP
/*
 * DASD_3990_ERP_ACTION_5 
 *
 * DESCRIPTION
 *   Setup ERP to do the ERP action 5 (see Reference manual).
 *
 *  PARAMETER
 *   erp                pointer to the current ERP
 *
 * RETURN VALUES
 *   erp                pointer to the ERP
 *
 */
ccw_req_t *
dasd_3990_erp_action_5 (ccw_req_t *erp)
{
        /* first of all retry */
        erp->retries = 10;
        erp->function = dasd_3990_erp_action_5;

        check_then_set (&erp->status,
                        CQR_STATUS_ERROR,
                        CQR_STATUS_QUEUED);

        /* further handling is done in xxx_further_erp after the retries */

        return erp;

} /* end dasd_3990_erp_action_5 */

/*
 * DASD_3990_HANDLE_ENV_DATA
 *
 * DESCRIPTION
 *   Handles 24 byte 'Enviromental data present'.
 *   Does a analysis of the sense data (message Format)
 *   and prints the error messages.
 *
 * PARAMETER
 *   sense              current sense data
 *   
 * RETURN VALUES
 *   void
 */
void
dasd_3990_handle_env_data (char *sense)
{
	/* check bytes 7-23 for further information */

	char msg_format = (sense[7] & 0xF0);
	char msg_no = (sense[7] & 0x0F);

	switch (msg_format) {
	case 0x00:		/* Format 0 - Program or System Checks */

		if (sense[1] & 0x10) {	/* check message to operator bit */

			switch (msg_no) {
			case 0x00:	/* No Message */
				break;
			case 0x01:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Invalid Command\n");
				break;
			case 0x02:
				printk (KERN_WARNING PRINTK_HEADER
				     "FORMAT 0 - Invalid Command Sequence\n");
				break;
			case 0x03:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - CCW Count less than "
					"required\n");
				break;
			case 0x04:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Invalid Parameter\n");
				break;
			case 0x05:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Diagnostic of Sepecial "
					"Command Violates File Mask\n");
				break;
			case 0x07:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Channel Returned with "
					"Incorrect retry CCW\n");
				break;
			case 0x08:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Reset Notification\n");
				break;
			case 0x09:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Storage Path Restart\n");
				break;
			case 0x0A:
				printk (KERN_WARNING PRINTK_HEADER
				    "FORMAT 0 - Channel requested ... %02x\n",
					sense[8]);
				break;
			case 0x0B:
				printk (KERN_WARNING PRINTK_HEADER
				     "FORMAT 0 - Invalid Defective/Alternate "
					"Track Pointer\n");
				break;
			case 0x0C:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - DPS Installation Check\n");
				break;
			case 0x0E:
				printk (KERN_WARNING PRINTK_HEADER
				    "FORMAT 0 - Command Invalid on Secondary "
					"Address\n");
				break;
			case 0x0F:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Status Not As Required: "
					"reason %02x\n",
					sense[8]);
				break;
			default:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Reseved\n");
			}
		} else {
			switch (msg_no) {
			case 0x00:	/* No Message */
				break;
			case 0x01:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Device Error Source\n");
				break;
			case 0x02:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Reserved\n");
				break;
			case 0x03:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Device Fenced - device = "
					"%02x\n",
					sense[4]);
				break;
			case 0x04:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Data Pinned for Device\n");
				break;
			default:
				printk (KERN_WARNING PRINTK_HEADER
					"FORMAT 0 - Reserved\n");
			}
                }
                break;
		
	case 0x10:		/* Format 1 - Device Equipment Checks */
		switch (msg_no) {
		case 0x00:	/* No Message */
			break;
		case 0x01:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Device Status 1 not as "
				"expected\n");
			break;
		case 0x03:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Index missing\n");
			break;
		case 0x04:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Interruption cannot be reset\n");
			break;
		case 0x05:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Device did not respond to "
				"selection\n");
			break;
		case 0x06:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Device check-2 error or Set "
				"Sector is not complete\n");
			break;
		case 0x07:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Head address does not compare\n");
			break;
		case 0x08:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Device status 1 not valid\n");
			break;
		case 0x09:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Device not ready\n");
			break;
		case 0x0A:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Track physical address did "
				"not compare\n");
			break;
		case 0x0B:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Missing device address bit\n");
			break;
		case 0x0C:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Drive motor switch is off\n");
			break;
		case 0x0D:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Seek incomplete\n");
			break;
		case 0x0E:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Cylinder address did not "
				"compare\n");
			break;
		case 0x0F:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Offset active cannot be reset\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 1 - Reserved\n");
		}
                break;		
                        
	case 0x20:		/* Format 2 - 3990 Equipment Checks */
		switch (msg_no) {
		case 0x08:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 2 - 3990 check-2 error\n");
			break;
		case 0x0E:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 2 - Support facility errors\n");
			break;
		case 0x0F:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 2 - Microcode detected error %02x\n",
				sense[8]);
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 2 - Reserved\n");
		}
                break;		

	case 0x30:		/* Format 3 - 3990 Control Checks */
		switch (msg_no) {
		case 0x0F:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 3 - Allegiance terminated\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 3 - Reserved\n");
		}
                break;		

	case 0x40:		/* Format 4 - Data Checks */
		switch (msg_no) {
		case 0x00:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - Home address area error\n");
			break;
		case 0x01:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - Count area error\n");
			break;
		case 0x02:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - Key area error\n");
			break;
		case 0x03:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - Data area error\n");
			break;
		case 0x04:
			printk (KERN_WARNING PRINTK_HEADER
			    "FORMAT 4 - No sync byte in home address area\n");
			break;
		case 0x05:
			printk (KERN_WARNING PRINTK_HEADER
			    "FORMAT 4 - No syn byte in count address area\n");
			break;
		case 0x06:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - No sync byte in key area\n");
			break;
		case 0x07:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - No syn byte in data area\n");
			break;
		case 0x08:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - Home address area error; "
				"offset active\n");
			break;
		case 0x09:
			printk (KERN_WARNING PRINTK_HEADER
			      "FORMAT 4 - Count area error; offset active\n");
			break;
		case 0x0A:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - Key area error; offset active\n");
			break;
		case 0x0B:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - Data area error; offset active\n");
			break;
		case 0x0C:
			printk (KERN_WARNING PRINTK_HEADER
			      "FORMAT 4 - No sync byte in home address area; "
				"offset active\n");
			break;
		case 0x0D:
			printk (KERN_WARNING PRINTK_HEADER
			      "FORMAT 4 - No syn byte in count address area; "
				"offset active\n");
			break;
		case 0x0E:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - No sync byte in key area; "
				"offset active\n");
			break;
		case 0x0F:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - No syn byte in data area; "
				"offset active\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 4 - Reserved\n");
		}
                break;		

	case 0x50:		/* Format 5 - Data Check with displacement information */
		switch (msg_no) {
		case 0x00:
			printk (KERN_WARNING PRINTK_HEADER
			  "FORMAT 5 - Data Check in the home address area\n");
			break;
		case 0x01:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 5 - Data Check in the count area\n");
			break;
		case 0x02:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 5 - Data Check in the key area\n");
			break;
		case 0x03:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 5 - Data Check in the data area\n");
			break;
		case 0x08:
			printk (KERN_WARNING PRINTK_HEADER
			    "FORMAT 5 - Data Check in the home address area; "
				"offset active\n");
			break;
		case 0x09:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 5 - Data Check in the count area; "
				"offset active\n");
			break;
		case 0x0A:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 5 - Data Check in the key area; "
				"offset active\n");
			break;
		case 0x0B:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 5 - Data Check in the data area; "
				"offset active\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 5 - Reserved\n");
		}
                break;		

	case 0x60:		/* Format 6 - Usage Statistics/Overrun Errors */
		switch (msg_no) {
		case 0x00:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Overrun on channel A\n");
			break;
		case 0x01:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Overrun on channel B\n");
			break;
		case 0x02:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Overrun on channel C\n");
			break;
		case 0x03:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Overrun on channel D\n");
			break;
		case 0x04:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Overrun on channel E\n");
			break;
		case 0x05:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Overrun on channel F\n");
			break;
		case 0x06:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Overrun on channel G\n");
			break;
		case 0x07:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Overrun on channel H\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 6 - Reserved\n");
		}
                break;		

	case 0x70:		/* Format 7 - Device Connection Control Checks */
		switch (msg_no) {
		case 0x00:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - RCC initiated by a connection "
				"check alert\n");
			break;
		case 0x01:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - RCC 1 sequence not successful\n");
			break;
		case 0x02:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - RCC 1 and RCC 2 sequences not "
				"successful\n");
			break;
		case 0x03:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - Invalid tag-in during selection "
				"sequence\n");
			break;
		case 0x04:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - extra RCC required\n");
			break;
		case 0x05:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - Invalid DCC selection response "
				"or timeout\n");
			break;
		case 0x06:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - Missing end operation; device "
				"transfer complete\n");
			break;
		case 0x07:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - Missing end operation; device "
				"transfer incomplete\n");
			break;
		case 0x08:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - Invalid tag-in for an immediate "
				"command sequence\n");
			break;
		case 0x09:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - Invalid tag-in for an extended "
				"command sequence\n");
			break;
		case 0x0A:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - 3990 microcode time out when "
				"stopping selection\n");
			break;
		case 0x0B:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - No response to selection after "
				"a poll interruption\n");
			break;
		case 0x0C:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - Permanent path error (DASD "
				"controller not available)\n");
			break;
		case 0x0D:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - DASD controller not available on "
				"disconnected command chain\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 7 - Reserved\n");
		}
                break;		

	case 0x80:		/* Format 8 - Additional Device Equipment Checks */
		switch (msg_no) {
		case 0x00:	/* No Message */
		case 0x01:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 8 - Error correction code hardware "
				"fault\n");
			break;
		case 0x03:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 8 - Unexpected end operation response "
				"code\n");
			break;
		case 0x04:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 8 - End operation with transfer count "
				"not zero\n");
			break;
		case 0x05:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 8 - End operation with transfer "
				"count zero\n");
			break;
		case 0x06:
			printk (KERN_WARNING PRINTK_HEADER
			      "FORMAT 8 - DPS checks after a system reset or "
				"selective reset\n");
			break;
		case 0x07:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 8 - DPS cannot be filled\n");
			break;
		case 0x08:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 8 - Short busy time-out during device "
				"selection\n");
			break;
		case 0x09:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 8 - DASD controller failed to set or "
				"reset the long busy latch\n");
			break;
		case 0x0A:
			printk (KERN_WARNING PRINTK_HEADER
			      "FORMAT 8 - No interruption from device during "
				"a command chain\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 8 - Reserved\n");
		}
                break;		

	case 0x90:		/* Format 9 - Device Read, Write, and Seek Checks */
		switch (msg_no) {
		case 0x00:
			break;	/* No Message */
		case 0x06:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 9 - Device check-2 error\n");
			break;
		case 0x07:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 9 - Head address did not compare\n");
			break;
		case 0x0A:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 9 - Track physical address did not "
				"compare while oriented\n");
			break;
		case 0x0E:
			printk (KERN_WARNING PRINTK_HEADER
			     "FORMAT 9 - Cylinder address did not compare\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT 9 - Reserved\n");
		}
                break;		

	case 0xF0:		/* Format F - Cache Storage Checks */
		switch (msg_no) {
		case 0x00:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Operation Terminated\n");
			break;
		case 0x01:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Subsystem Processing Error\n");
			break;
		case 0x02:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Cache or nonvolatile storage "
				"equipment failure\n");
			break;
		case 0x04:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Caching terminated\n");
			break;
		case 0x06:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Cache fast write access not "
				"authorized\n");
			break;
		case 0x07:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Track format incorrect\n");
			break;
		case 0x09:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Caching reinitiated\n");
			break;
		case 0x0A:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Nonvolatile storage terminated\n");
			break;
		case 0x0B:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Volume is suspended duplex\n");
			break;
		case 0x0C:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - Subsystem status connot be "
				"determined\n");
			break;
		case 0x0D:
			printk (KERN_WARNING PRINTK_HEADER
			      "FORMAT F - Caching status reset to default\n");
			break;
		case 0x0E:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT F - DASD Fast Write inhibited\n");
			break;
		default:
			printk (KERN_WARNING PRINTK_HEADER
				"FORMAT D - Reserved\n");
		}
                break;		

	default:		/* unknown message format - should not happen */

	} /* end switch message format */

} /* end dasd_3990_handle_env_data */

/*
 * DASD_3990_ERP_COM_REJ
 *
 * DESCRIPTION
 *   Handles 24 byte 'Command Reject' error.
 *
 * PARAMETER
 *   erp                current erp_head
 *   sense              current sense data
 * 
 * RETURN VALUES
 *   erp                'new' erp_head - pointer to new ERP 
 */
ccw_req_t *
dasd_3990_erp_com_rej (ccw_req_t *erp,
		       char      *sense)
{
	dasd_device_t *device = erp->device;
        ccw_req_t     *cqr    = NULL;

        erp->function = dasd_3990_erp_com_rej;

	/* env data present (ACTION 10 - retry should work) */
	if (sense[2] & SNS2_ENV_DATA_PRESENT) {

                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Command Reject - environmental data present\n");

		dasd_3990_handle_env_data (sense);

		erp->retries = 5;

	} else {
		/* fatal error -  set status to FAILED */
                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Command Reject - Fatal error\n");

                cqr = erp->refers;

                dasd_free_request (erp);

                erp = cqr;

 		check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_FAILED);

	}

	return erp;

} /* end dasd_3990_erp_com_rej */

/*
 * DASD_3990_ERP_BUS_OUT 
 *
 * DESCRIPTION
 *   Handles 24 byte 'Bus Out Parity Check' error.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_bus_out (ccw_req_t *erp)
{
	dasd_device_t *device = erp->device;

        /* first time set initial retry counter and erp_function */
        if (erp->function != dasd_3990_erp_bus_out) {
                erp->retries  = 256;
                erp->function = dasd_3990_erp_bus_out;
        }

        /* issue a message and wait for 'device ready' interrupt */

	DASD_MESSAGE (KERN_WARNING, device,
                      "%s",
                      "bus out parity error or BOPC requested by channel\n");

        dasd_3990_erp_block_queue (erp,
                                   60);

	return erp;

} /* end dasd_3990_erp_bus_out */
#endif /* ERP_FULL_ERP */

/*
 * DASD_3990_ERP_EQUIP_CHECK
 *
 * DESCRIPTION
 *   Handles 24 byte 'Equipment Check' error.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_equip_check (ccw_req_t *erp,
			   char      *sense)
{
	dasd_device_t *device = erp->device;

	erp->function = dasd_3990_erp_equip_check;

#ifdef ERP_FULL_ERP
	if (sense[1] & SNS1_WRITE_INHIBITED) {

		DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Write inhibited path encountered");

		/* vary path offline */
		DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Path should be varied off-line. "
                              "This is not implemented yet \n - please report to "
                              "linux390@de.ibm.com");

		erp = dasd_3990_erp_action_1 (erp);

	} else 
#endif /* ERP_FULL_ERP */
                if (sense[2] & SNS2_ENV_DATA_PRESENT) {
                        
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "Equipment Check - "
                                      "environmental data present");
#ifdef ERP_FULL_ERP
                        dasd_3990_handle_env_data (sense);
#endif /* ERP_FULL_ERP */
                        
                        erp = dasd_3990_erp_action_4 (erp,
                                                      sense);

#ifdef ERP_FULL_ERP
                } else if (sense[1] & SNS1_PERM_ERR) {
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "Equipment Check - retry exhausted or "
                                      "undesirable\n");
                        
                        erp = dasd_3990_erp_action_1 (erp);
                        
                } else {
                        /* all other equipment checks - Action 5 */
                        /* rest is done when retries == 0 */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "Equipment check or processing error\n");
                        
                        erp = dasd_3990_erp_action_5 (erp);
#endif /* ERP_FULL_ERP */
                }
        
        return erp;
        
} /* end dasd_3990_erp_equip_check */

/*
 * DASD_3990_ERP_DATA_CHECK
 *
 * DESCRIPTION
 *   Handles 24 byte 'Data Check' error.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_data_check (ccw_req_t *erp,
			  char      *sense)
{
	dasd_device_t *device = erp->device;

	erp->function = dasd_3990_erp_data_check;

#ifdef ERP_FULL_ERP
	if (sense[2] & SNS2_CORRECTABLE) {	/* correctable data check */

		/* issue message that the data has been corrected */
		DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Data recovered during retry with PCI "
                              "fetch mode active\n");

                /* not possible to handle this situation in Linux */    
                panic("No way to inform appliction about the possibly "
                      "incorret data");

	} else if (sense[2] & SNS2_ENV_DATA_PRESENT) {

		DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Uncorrectable data check recovered secondary "
                              "addr of duplex pair");

		erp = dasd_3990_erp_action_4 (erp,
					      sense);

	} else if (sense[1] & SNS1_PERM_ERR) {

		DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Uncorrectable data check with internal "
                              "retry exhausted\n");

		erp = dasd_3990_erp_action_1 (erp);

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

		erp = dasd_3990_erp_action_5 (erp);
	}

#else
	if (sense[2] & SNS2_ENV_DATA_PRESENT) {
                
		DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Uncorrectable data check recovered secondary "
                              "addr of duplex pair");

		erp = dasd_3990_erp_action_4 (erp,
					      sense);
	}
#endif /* ERP_FULL_ERP */

	return erp;

} /* end dasd_3990_erp_data_check */

#ifdef ERP_FULL_ERP
/*
 * 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_WARNING, device,
                      "%s",
                      "Overrun - service overrun or overrun"
                      " error requested by channel\n");

        erp = dasd_3990_erp_action_5 (erp);

	return erp;

} /* end dasd_3990_erp_overrun */
#endif /* ERP_FULL_ERP */

/*
 * 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_WARNING, device,
                              "%s",
                              "Track format error when destaging or "
                              "staging data");

#ifdef ERP_FULL_ERP
		dasd_3990_handle_env_data (sense);

		erp = dasd_3990_erp_action_4 (erp,
					      sense);

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

		check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_FAILED);
        }
#else
		erp = dasd_3990_erp_action_4 (erp,
					      sense);
	}
#endif /* ERP_FULL_ERP */

	return erp;

} /* end dasd_3990_erp_inv_format */

#ifdef ERP_FULL_ERP
/*
 * DASD_3990_ERP_EOC
 *
 * DESCRIPTION
 *   Handles 24 byte 'End-of-Cylinder' error.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_EOC (ccw_req_t *erp,
		   char      *sense)
{

	dasd_device_t *device = erp->device;

	erp->function = dasd_3990_erp_EOC;

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

        /* implement action 7 */
        BUG();

	return erp;

} /* end dasd_3990_erp_EOC */
#endif /* ERP_FULL_ERP */  

/*
 * 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_WARNING, device,
                      "%s",
                      "Environmental data present");
#ifdef ERP_FULL_ERP
        dasd_3990_handle_env_data (sense);
#endif /* ERP_FULL_ERP */  

	erp = dasd_3990_erp_action_4 (erp,
				      sense);

	return erp;

} /* end dasd_3990_erp_env_data */

#ifdef ERP_FULL_ERP
/*
 * DASD_3990_ERP_NO_REC
 *
 * DESCRIPTION
 *   Handles 24 byte 'No Record Found' error.
 *
 * PARAMETER
 *   erp                current erp_head
 * RETURN VALUES
 *   erp                new erp_head - pointer to new ERP
 */
ccw_req_t *
dasd_3990_erp_no_rec (ccw_req_t *erp,
		      char      *sense)
{
	dasd_device_t *device = erp->device;

	erp->function = dasd_3990_erp_no_rec;
        
        DASD_MESSAGE (KERN_WARNING, device,
                      "%s",
                      "No Record Found - Fatal error should "
                      "have been handled within the interrupt handler\n");
        
        check_then_set (&erp->status,
                        CQR_STATUS_ERROR,
                        CQR_STATUS_FAILED);

	return erp;

} /* 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;

	erp->function = dasd_3990_erp_file_prot;

        DASD_MESSAGE (KERN_WARNING, device,
                      "%s",
                      "File Protected\n");

        check_then_set (&erp->status,
                        CQR_STATUS_ERROR,
                        CQR_STATUS_FAILED);

	return erp;

} /* end dasd_3990_erp_file_prot */
#endif /* ERP_FULL_ERP */  

/*
 * 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;
	dasd_device_t *device = erp->device;

	/* Check sense for ....    */
#ifdef ERP_FULL_ERP
	/* '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);
	}
#endif /* ERP_FULL_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);
	}
#ifdef ERP_FULL_ERP
	/* 'Overrun'               */
	if ((erp_filled == NULL) &&
	    (sense[0] & SNS0_OVERRUN)) {
		erp_filled = dasd_3990_erp_overrun (erp,
						    sense);
	}
#endif /* ERP_FULL_ERP */  
	/* 'Invalid Track Format'  */
	if ((erp_filled == NULL) &&
	    (sense[1] & SNS1_INV_TRACK_FORMAT)) {
		erp_filled = dasd_3990_erp_inv_format (erp,
						       sense);
	}
#ifdef ERP_FULL_ERP
	/* 'End-of-Cylinder'       */
	if ((erp_filled == NULL) &&
	    (sense[1] & SNS1_EOC)) {
		erp_filled = dasd_3990_erp_EOC (erp,
						sense);
	}
#endif /* ERP_FULL_ERP */  
	/* 'Environmental Data'    */
	if ((erp_filled == NULL) &&
	    (sense[2] & SNS2_ENV_DATA_PRESENT)) {
		erp_filled = dasd_3990_erp_env_data (erp,
						     sense);
	}
#ifdef ERP_FULL_ERP
	/* '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);
	}
#endif /* ERP_FULL_ERP */  

	/* other (unknown) error - do default ERP                     */
	if (erp_filled == NULL) {

                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "default ERP taken");

		erp_filled = erp;	
	}

	return erp_filled;

} /* END dasd_3990_erp_inspect_24 */

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

#ifdef ERP_FULL_ERP
/*
 * 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_WARNING, device,
                      "%s",
                      "Perform logging requested\n");

	return erp;

} /* end dasd_3990_erp_action_10_32 */
#endif /* ERP_FULL_ERP */  

/*
 * 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 created 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_WARNING, device,
                      "%s",
                      "Write not finsihed 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_WARNING, device,
                              "%s",
                              "Imprecise ending is set - just retry");

                return default_erp;
        } 
         
        /* determine the address of the CCW to be restarted */
        /* Imprecise ending is not set -> addr from IRB-SCSW */
        cpa = default_erp->refers->dstat->cpa;    
        
        if (cpa == 0) {
                
                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Unable to determine address of the CCW "
                              "to be restarted");
                
                check_then_set (&default_erp->status,
                                CQR_STATUS_FILLED,
                                CQR_STATUS_FAILED);
                
                return default_erp;
        }
        
	/* Build new ERP request including DE/LO */
	erp = dasd_alloc_request ((char *) &cqr->magic,
                                  2 + 1,                    /* DE/LO + TIC */
                                  sizeof (DE_eckd_data_t) +
                                  sizeof (LO_eckd_data_t));

	if ( !erp ) {
                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Unable to allocate ERP");
                
                check_then_set (&default_erp->status,
                                               CQR_STATUS_FILLED,
                                               CQR_STATUS_FAILED);
                
                return default_erp;
	}
        
        /* use original DE */
	DE_data = erp->data;
        memcpy (DE_data, 
                cqr->data, 
                sizeof (DE_eckd_data_t));
        
        /* create LO */
	LO_data = erp->data + sizeof (DE_eckd_data_t);
        
        if ((sense[3]  == 0x01) &&
            (LO_data[1] & 0x01)   ){

                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "BUG - this should not happen");
                //BUG();    /* check for read count suffixing n.a. */
        }

        if ((sense[7] & 0x3F) == 0x01) {
                /* operation code is WRITE DATA -> data area orientation */
                LO_data[0] = 0x81;

        } else if ((sense[7] & 0x3F) == 0x03) {
                /* operation code is FORMAT WRITE -> index orientation */
                LO_data[0] = 0xC3;

        } else {
                LO_data[0] = sense[7];  /* operation */
        }

        LO_data[1] = sense[8];  /* auxiliary */
        LO_data[2] = sense[9];  
        LO_data[3] = sense[3];  /* count */ 
        LO_data[4] = sense[29]; /* seek_addr.cyl */
        LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
        LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */  

        memcpy (&(LO_data[8]), &(sense[11]), 8);   

        /* create DE ccw */    
        ccw = erp->cpaddr;
	memset (ccw, 0, sizeof (ccw1_t));
	ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
	ccw->flags = CCW_FLAG_CC;
	ccw->count = 16;
	set_normalized_cda (ccw, __pa (DE_data));

        /* create LO ccw */    
        ccw++;
	memset (ccw, 0, sizeof (ccw1_t));
	ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
	ccw->flags = CCW_FLAG_CC;
	ccw->count = 16;
	set_normalized_cda (ccw, __pa (LO_data));
        
        /* TIC to the failed ccw */
        ccw++;
	ccw->cmd_code = CCW_CMD_TIC;
	ccw->cda = cpa;

        /* fill erp related fields */
        erp->function = dasd_3990_erp_action_1B_32;
	erp->refers   = default_erp->refers;
	erp->device   = device;
	erp->magic    = default_erp->magic;
	erp->lpm      = 0xFF;
	erp->expires  = 0;
	erp->retries  = 255;
	erp->status   = CQR_STATUS_FILLED;
        
        /* remove the default erp */
        dasd_free_request (default_erp);
        
	return erp;
        
} /* end dasd_3990_erp_action_1B_32 */

/*
 * DASD_3990_UPDATE_1B
 *
 * DESCRIPTION
 *   Handles the update to the 32 byte 'Action 1B' of Single Program 
 *   Action Codes in case the first action was not successful.
 *   The already created 'previous_erp' is the currently not successful
 *   ERP. 
 *
 * PARAMETER
 *   previous_erp       already created previous erp.
 *   sense              current sense data 
 * RETURN VALUES
 *   erp                modified erp 
 */
ccw_req_t *
dasd_3990_update_1B (ccw_req_t *previous_erp,
                     char      *sense)
{
	dasd_device_t  *device = previous_erp->device;
        __u32          cpa     = 0;
        ccw_req_t      *cqr;
	ccw_req_t      *erp;
	char           *LO_data;   /* LO_eckd_data_t */
        ccw1_t         *ccw;

	DASD_MESSAGE (KERN_WARNING, device,
                      "%s",
                      "Write not finsihed because of unexpected condition"
                      " - follow on");
        
        /* determine the original cqr */
        cqr = previous_erp; 
        while (cqr->refers != NULL){
                cqr = cqr->refers;
        }
         
        /* for imprecise ending just do default erp */
        if (sense[1] & 0x01) {

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

                check_then_set (&previous_erp->status,
                                               CQR_STATUS_ERROR,
                                               CQR_STATUS_QUEUED);

                return previous_erp;
        } 
         
        /* determine the address of the CCW to be restarted */
        /* Imprecise ending is not set -> addr from IRB-SCSW */
        cpa = previous_erp->dstat->cpa;    
        
        if (cpa == 0) {
                ccw = cqr->cpaddr;   /* addr of first data transfer */
                ccw++;               /* command in domain           */
                ccw++;
                cpa = (__u32) ccw; 
        }
        
        if (cpa == 0) {
                
                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "Unable to determine address of the CCW "
                              "to be restarted");
                
                check_then_set (&previous_erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_FAILED);
                
                return previous_erp;
        }
        
        erp = previous_erp;

	/* update the LO with the new returned sense data  */
	LO_data = erp->data + sizeof (DE_eckd_data_t);
        
        if ((sense[3]  == 0x01) &&
            (LO_data[1] & 0x01)   ){

                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "BUG - this should not happen");
                //BUG();    /* check for read count suffixing n.a. */
        }

        if ((sense[7] & 0x3F) == 0x01) {
                /* operation code is WRITE DATA -> data area orientation */
                LO_data[0] = 0x81;

        } else if ((sense[7] & 0x3F) == 0x03) {
                /* operation code is FORMAT WRITE -> index orientation */
                LO_data[0] = 0xC3;

        } else {
                LO_data[0] = sense[7];  /* operation */
        }

        LO_data[1] = sense[8];  /* auxiliary */
        LO_data[2] = sense[9];  
        LO_data[3] = sense[3];  /* count */ 
        LO_data[4] = sense[29]; /* seek_addr.cyl */
        LO_data[5] = sense[30]; /* seek_addr.cyl 2nd byte */
        LO_data[7] = sense[31]; /* seek_addr.head 2nd byte */  

        memcpy (&(LO_data[8]), &(sense[11]), 8);   

        /* TIC to the failed ccw */
        ccw = erp->cpaddr;  /* addr of DE ccw */
        ccw++;              /* addr of LE ccw */
        ccw++;              /* addr of TIC ccw */ 
	ccw->cda = cpa;

	check_then_set (&erp->status,
                        CQR_STATUS_ERROR,
                        CQR_STATUS_QUEUED);
        
	return erp;
        
} /* end dasd_3990_update_1B */

#ifdef ERP_FULL_ERP
/*
 * DASD_3990_ERP_COMPOUND_RETRY 
 *
 * DESCRIPTION
 *   Handles the compound ERP action retry code.
 *
 * PARAMETER
 *   sense              sense data of the actual error
 *   erp                pointer to the currently created ERP
 *
 * RETURN VALUES
 *   erp                modified ERP pointer
 *
 */
void
dasd_3990_erp_compound_retry (ccw_req_t *erp,
                              char      *sense)
{
        switch (sense[25] & 0x03) { 
        case 0x00:	/* no not retry */
                erp->retries = 0;
                break;
                
        case 0x01:	/* retry 2 times */
                erp->retries = 2;

                check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_QUEUED);
                break;
                
        case 0x02:	/* retry 10 times */
                erp->retries = 10;

                check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_QUEUED);
                break;
                
        case 0x03:	/* retry 255 times */
                erp->retries = 255;

                check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_QUEUED);
                break;
                
        default:
                BUG();
        }

        erp->function = dasd_3990_erp_compound_retry;

} /* end dasd_3990_erp_compound_retry */

/*
 * DASD_3990_ERP_COMPOUND_PATH 
 *
 * DESCRIPTION
 *   Handles the compound ERP action for retry on alternate
 *   channel path.
 *
 * PARAMETER
 *   sense              sense data of the actual error
 *   erp                pointer to the currently created ERP
 *
 * RETURN VALUES
 *   erp                modified ERP pointer
 *
 */
void
dasd_3990_erp_compound_path (ccw_req_t *erp,
                             char      *sense)
{

        if (sense[25] & DASD_SENSE_BIT_3) {
                dasd_3990_erp_alternate_path (erp);
                
                if (erp->status == CQR_STATUS_FAILED) {
                        /* reset the lpm and the status to be able to 
                         * try further actions. */
        
                        erp->lpm = LPM_ANYPATH;
                        
                        check_then_set (&erp->status,
                                        CQR_STATUS_FAILED,
                                        CQR_STATUS_ERROR);
                        
                }
        }
        
        erp->function = dasd_3990_erp_compound_path;

} /* end dasd_3990_erp_compound_path */

/*
 * DASD_3990_ERP_COMPOUND_CODE 
 *
 * DESCRIPTION
 *   Handles the compound ERP action for retry code.
 *
 * PARAMETER
 *   sense              sense data of the actual error
 *   erp                pointer to the currently created ERP
 *
 * RETURN VALUES
 *   erp                NEW ERP pointer
 *
 */
ccw_req_t *
dasd_3990_erp_compound_code (ccw_req_t *erp,
                             char      *sense)
{

        
        if (sense[25] & DASD_SENSE_BIT_2) {

                switch (sense[28]) {
                case 0x17:
                        /* issue a Diagnostic Control command with an 
                         * Inhibit Write subcommand and controler modifier */
                        erp = dasd_3990_erp_DCTL (erp,
                                                  0x20);
                        break;
                        
                case 0x25:
                        /* wait for 5 seconds and retry again */
                        erp->retries = 1;
                        
                        dasd_3990_erp_block_queue (erp,
                                                   5);
                        break;
                        
                default:
                        BUG();
                }
        }

        erp->function = dasd_3990_erp_compound_code;

        return erp;

} /* end dasd_3990_erp_compound_code */

/*
 * DASD_3990_ERP_COMPOUND_CONFIG 
 *
 * DESCRIPTION
 *   Handles the compound ERP action for configruation
 *   dependent error.
 *   Note: duplex handling is not implemented (yet).
 *
 * PARAMETER
 *   sense              sense data of the actual error
 *   erp                pointer to the currently created ERP
 *
 * RETURN VALUES
 *   erp                modified ERP pointer
 *
 */
void
dasd_3990_erp_compound_config (ccw_req_t *erp,
                               char      *sense)
{
        if ((sense[25] & DASD_SENSE_BIT_1) && 
            (sense[26] & DASD_SENSE_BIT_2)   ) {	

                /* set to suspended duplex state then restart */
                dasd_device_t *device  = erp->device;

                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",      
                              "Set device to suspended duplex state should be done!\n"
                              "This is not implemented yet (for compound ERP)\n"
                              " - please report to linux390@de.ibm.com");
                
        }

        erp->function = dasd_3990_erp_compound_config;

} /* end dasd_3990_erp_compound_config */

/*
 * DASD_3990_ERP_COMPOUND 
 *
 * DESCRIPTION
 *   Does a detailed inspection of the 32 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 ERP
 *
 * RETURN VALUES
 *   erp                (additional) ERP pointer
 *
 */
ccw_req_t *
dasd_3990_erp_compound (ccw_req_t *erp,
                        char      *sense)
{
        if ((erp->function != dasd_3990_erp_compound_retry ) &&
            (erp->function != dasd_3990_erp_compound_path  ) &&
            (erp->function != dasd_3990_erp_compound_code  ) &&
            (erp->function != dasd_3990_erp_compound_config)   ) {

                /* called first time */
                dasd_3990_erp_compound_retry (erp,
                                              sense);
        }
        
        /* do further action if no retry is specified / left */
        if ((erp->function == dasd_3990_erp_compound_retry) &&
            (erp->status   == CQR_STATUS_ERROR            )   ){
                
                dasd_3990_erp_compound_path (erp,
                                             sense);
        }

        if ((erp->function == dasd_3990_erp_compound_path) &&
            (erp->status   == CQR_STATUS_ERROR           )   ){

                erp = dasd_3990_erp_compound_code (erp,
                                                   sense);
        }

        if ((erp->function == dasd_3990_erp_compound_code) && 
            (erp->status   == CQR_STATUS_ERROR           )   ){
                
                dasd_3990_erp_compound_config (erp,
                                               sense);
        }

        /* if no compound action ERP specified, the request failed */
        if (erp->status == CQR_STATUS_ERROR) {

                check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_FAILED);
        }

        return erp;
        
} /* end dasd_3990_erp_compound */
#endif /* ERP_FULL_ERP */  

/*
 * DASD_3990_ERP_INSPECT_32 
 *
 * DESCRIPTION
 *   Does a detailed inspection of the 32 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_filled         pointer to the ERP
 *
 */
ccw_req_t *
dasd_3990_erp_inspect_32 ( ccw_req_t *erp,
                           char      *sense )
{
	dasd_device_t *device = erp->device;

	erp->function = dasd_3990_erp_inspect_32;

	if (sense[25] & DASD_SENSE_BIT_0) {

		/* compound program action codes (byte25 bit 0 == '1') */
#ifdef ERP_FULL_ERP
                erp = dasd_3990_erp_compound (erp,
                                              sense);
#else
                DASD_MESSAGE (KERN_WARNING, device,
                              "%s",
                              "default ERP taken");
#endif /* ERP_FULL_ERP */  

	} else {

		/* single program action codes (byte25 bit 0 == '0') */
		switch (sense[25]) {
#ifdef ERP_FULL_ERP
		case 0x00:	/* success */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "ERP called for successful request %p"
                                      " - NO ERP necessary",
                                      erp);

                        check_then_set (&erp->status,
                                        CQR_STATUS_ERROR,
                                        CQR_STATUS_DONE);
                        break;
                        
		case 0x01:	/* fatal error */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "Fatal error should "
                                      "have been handled within the interrupt handler\n");

                        check_then_set (&erp->status,
                                        CQR_STATUS_ERROR,
                                        CQR_STATUS_FAILED);
                        break;

		case 0x02:	/* intervention required */
		case 0x03:	/* intervention required during dual copy */
                        erp = dasd_3990_erp_int_req (erp);
                        break;

		case 0x0F:	/* length mismatch during update write command */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "update write command error - should not happen; "
                                      "Please send this message together with the above "
                                      "sense data to linux390@de.ibm.com\n");

                        check_then_set (&erp->status,
                                        CQR_STATUS_ERROR,
                                        CQR_STATUS_FAILED);
                        break;

		case 0x10:	/* logging required for other channel program */
                        erp = dasd_3990_erp_action_10_32 (erp,
                                                    sense);
                        break;

		case 0x15:	/* next track outside defined extend */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "next track outside defined extend - should not happen; "
                                      "Please send this message together with the above "
                                      "sense data to linux390@de.ibm.com\n");

                        check_then_set (&erp->status,
                                        CQR_STATUS_ERROR,
                                        CQR_STATUS_FAILED);
                        break;
#endif /* ERP_FULL_ERP */  

		case 0x1B:	/* unexpected condition during write */

                        erp = dasd_3990_erp_action_1B_32 (erp,
                                                          sense);
                        break;

#ifdef ERP_FULL_ERP
		case 0x1C:	/* invalid data */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "Data recovered during retry with PCI "
                                      "fetch mode active\n");
                        
                        /* not possible to handle this situation in Linux */    
                        panic("No way to inform appliction about the possibly "
                              "incorret data");
			break;
#endif /* ERP_FULL_ERP */  

		case 0x1D:	/* state-change pending */
                        DASD_MESSAGE (KERN_WARNING, device, 
                                      "%s",
                                      "A State change pending condition exists "
                                      "for the subsystem or device");

                        erp = dasd_3990_erp_action_4 (erp,
                                                      sense);
			break;

		default:	/* all others errors */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%s",
                                      "default ERP taken");
		}
	}

	return erp;

} /* end dasd_3990_erp_inspect_32 */

/*
 ***************************************************************************** 
 * main ERP control fuctions (24 and 32 byte sense)
 ***************************************************************************** 
 */

/*
 * DASD_3990_ERP_INSPECT
 *
 * DESCRIPTION
 *   Does a detailed inspection for sense data by calling either
 *   the 24-byte or the 32-byte inspection routine.
 *
 * PARAMETER
 *   erp                pointer to the currently created default ERP
 * RETURN VALUES
 *   erp_new            contens was possibly modified 
 */
ccw_req_t *
dasd_3990_erp_inspect (ccw_req_t *erp)
{
	ccw_req_t *erp_new = NULL;
	/* sense data are located in the refers record of the */
	/* already set up new ERP !                           */
	char *sense = erp->refers->dstat->ii.sense.data;

	/* distinguish between 24 and 32 byte sense data */
	if (sense[27] & DASD_SENSE_BIT_0) {

		/* inspect the 24 byte sense data */
		erp_new = dasd_3990_erp_inspect_24 (erp,
                                                    sense);

	} else {

		/* inspect the 32 byte sense data */
		erp_new = dasd_3990_erp_inspect_32 (erp,
                                                    sense);

	} /* end distinguish between 24 and 32 byte sense data */

	return erp_new;

} /* END dasd_3990_erp_inspect */

/*
 * DASD_3990_ERP_ADD_ERP
 * 
 * DESCRIPTION
 *   This funtion adds an additional request block (ERP) to the head of
 *   the given cqr (or erp).
 *   This erp is initialized as an default erp (retry TIC)
 *
 * PARAMETER
 *   cqr                head of the current ERP-chain (or single cqr if 
 *                      first error)
 * RETURN VALUES
 *   erp                pointer to new ERP-chain head
 */
ccw_req_t *
dasd_3990_erp_add_erp (ccw_req_t *cqr)
{
	/* allocate additional request block */
	ccw_req_t *erp = dasd_alloc_request ((char *) &cqr->magic, 1, 0);
	if ( !erp ) {
		printk( KERN_WARNING PRINTK_HEADER
			"unable to allocate ERP request\n" );
                return NULL;
	}

	/* initialize request with default TIC to current ERP/CQR */
	erp->cpaddr->cmd_code = CCW_CMD_TIC;
	erp->cpaddr->cda      = ((__u32) cqr->cpaddr);
	erp->function = dasd_3990_erp_add_erp;
	erp->refers   = cqr;
	erp->device   = cqr->device;
	erp->magic    = cqr->magic;
	erp->lpm      = 0xFF;
	erp->expires  = 0;
	erp->retries  = 255;

	erp->status = CQR_STATUS_FILLED;

	return erp;
}

/*
 * DASD_3990_ERP_ADDITIONAL_ERP 
 * 
 * DESCRIPTION
 *   An additional ERP is needed to handle the current error.
 *   Add ERP to the head of the ERP-chain containing the ERP processing
 *   determined based on the sense data.
 *
 * PARAMETER
 *   cqr                head of the current ERP-chain (or single cqr if 
 *                      first error)
 *
 * RETURN VALUES
 *   erp                pointer to new ERP-chain head
 */
ccw_req_t *
dasd_3990_erp_additional_erp (ccw_req_t *cqr)
{

	ccw_req_t *erp = NULL;

	/* add erp and initialize with default TIC */
	erp = dasd_3990_erp_add_erp (cqr);

	/* inspect sense, determine specific ERP if possible */
        if (erp != NULL) {
                erp = dasd_3990_erp_inspect (erp);
        }

	return erp;

} /* end dasd_3990_erp_additional_erp */

/*
 * DASD_3990_ERP_ERROR_MATCH
 *
 * DESCRIPTION
 *   check if the the device status of the given cqr is the same.
 *   This means that the failed CCW and the relevant sense data
 *   must match.
 *   I don't distinguish between 24 and 32 byte sense becaus in case of
 *   24 byte sense byte 25 and 27 is set as well.
 *
 * PARAMETER
 *   cqr1               first cqr, which will be compared with the 
 *   cqr2               second cqr.
 *
 * RETURN VALUES
 *   match              'boolean' for match found
 *                      returns 1 if match found, otherwise 0.
 */
int
dasd_3990_erp_error_match (ccw_req_t *cqr1,
			   ccw_req_t *cqr2)
{
	/* check failed CCW */
	if (cqr1->dstat->cpa !=
	    cqr2->dstat->cpa) {
	//	return 0;	/* CCW doesn't match */
                printk(KERN_WARNING PRINTK_HEADER 
                       "_error_match: CCW doesn't match -> ignore\n");
	}
	/* check sense data; byte 0-2,25,27 */
	if (!((strncmp (cqr1->dstat->ii.sense.data,
			cqr2->dstat->ii.sense.data,
			3) == 0) &&
	      (cqr1->dstat->ii.sense.data[27] ==
	       cqr2->dstat->ii.sense.data[27]   ) &&
	      (cqr1->dstat->ii.sense.data[25] ==
	       cqr2->dstat->ii.sense.data[25]   )   )) {

		return 0;	/* sense doesn't match */
	}
	return 1;		/* match */

}				/* end dasd_3990_erp_error_match */

/*
 * DASD_3990_ERP_IN_ERP
 *
 * DESCRIPTION
 *   check if the current error already happened before.
 *   quick exit if current cqr is not an ERP (cqr->refers=NULL)
 *
 * PARAMETER
 *   cqr                failed cqr (either original cqr or already an erp)
 *
 * RETURN VALUES
 *   erp                erp-pointer to the already defined error recovery procedure OR
 *                      NULL if a 'new' error occurred.
 */
ccw_req_t *
dasd_3990_erp_in_erp (ccw_req_t *cqr)
{
	ccw_req_t *erp_head = cqr,	/* save erp chain head */
	         *erp_match = NULL;	/* save erp chain head */
	int match = 0;		/* 'boolean' for matching error found */

	if (cqr->refers == NULL) {	/* return if not in erp */
		return NULL;
	}
	/* check the erp/cqr chain for current error */
	do {
		match = dasd_3990_erp_error_match (erp_head,
						   cqr->refers);
		erp_match = cqr;	/* save possible matching erp  */
		cqr = cqr->refers;	/* check next erp/cqr in queue */
	} while ((cqr->refers != NULL) &&
		 (match == 0));

	if (match) {
		return erp_match;	/* return address of matching erp */
	} else {
		return NULL;	/* return NULL to indicate that no match
				   was found */
	}

} /* END dasd_3990_erp_in_erp */

/*
 * DASD_3990_ERP_FURTHER_ERP (24 & 32 byte sense)
 *
 * DESCRIPTION
 *   No retry is left for the current ERP. Check what has to be done 
 *   with the ERP.
 *     - do further defined ERP action or
 *     - wait for interrupt or  
 *     - exit with permanent error
 *
 * PARAMETER
 *   erp                ERP which is in progress wiht no retry left
 *
 * RETURN VALUES
 *   erp                modified/additional ERP
 */
ccw_req_t *
dasd_3990_erp_further_erp (ccw_req_t *erp)
{
        dasd_device_t     *device = erp->device;
        
#ifdef ERP_FULL_ERP
        /* check for 24 byte sense ERP */
	if ((erp->function == dasd_3990_erp_bus_out ) ||
            (erp->function == dasd_3990_erp_action_1) ||
            (erp->function == dasd_3990_erp_action_4)   ){
                
                erp = dasd_3990_erp_action_1 (erp);
                
	} else if (erp->function == dasd_3990_erp_action_5) {
                
                /* retries have not been successful */
                char *sense = erp->dstat->ii.sense.data;
                
                /* prepare erp for retry on different channel path */
                erp = dasd_3990_erp_action_1 (erp);
                
                if (!(sense[ 2] & DASD_SENSE_BIT_0)) {

                        /* issue a Diagnostic Control command with an 
                         * Inhibit Write subcommand */

                        switch (sense[25]) {
                        case 0x17:
                        case 0x57: { /* controller */
                                erp = dasd_3990_erp_DCTL (erp,
                                                          0x20);
                                break;
                        }
                        case 0x18:
                        case 0x58: { /* channel path */
                                erp = dasd_3990_erp_DCTL (erp,
                                                          0x40);
                                break;
                        }
                        case 0x19:
                        case 0x59: { /* storage director */
                                erp = dasd_3990_erp_DCTL (erp,
                                                          0x80);
                                break;
                        }
                        default:
                                DASD_MESSAGE (KERN_WARNING, device,
                                              "invalid subcommand modifier 0x%x for "
                                              "Diagnostic Control Command",
                                              sense[25]);
                        }
                } 

//        /* check for 32 byte sense ERP */
//	} else if ((erp->function == dasd_3990_erp_xxx){
#else
        /* check for 24 byte sense ERP */
	if ((erp->function == dasd_3990_erp_action_1) ||
            (erp->function == dasd_3990_erp_action_4)   ){
                
                erp = dasd_3990_erp_action_1 (erp);
#endif /* ERP_FULL_ERP */  
                
	} else {
                /* no retry left and no additional special handling necessary */
                DASD_MESSAGE (KERN_WARNING, device,
                              "no retries left for erp %p - "
                              "set status to FAILED",
                              erp);

		check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_FAILED);
	}

	return erp; 

} /* end dasd_3990_erp_further_erp */

/*
 * DASD_3990_ERP_HANDLE_MATCH_ERP 
 *
 * DESCRIPTION
 *   An error occurred again and an ERP has been detected which is already
 *   used to handle this error (e.g. retries). 
 *   All prior ERP's are set to status DONE and the retry counter is
 *   decremented.
 *   If retry counter is already 0, it has to checked if further action
 *   is needed (besides retry) or if the ERP has failed.
 *
 * PARAMETER
 *   erp_head           first ERP in ERP-chain
 *   erp_match          ERP that handles the actual error.
 *
 * RETURN VALUES
 *   none                
 */
void
dasd_3990_erp_handle_match_erp (ccw_req_t *erp_head,
				ccw_req_t *erp_match)
{

	dasd_device_t *device   = erp_head->device;
	ccw_req_t     *erp_done = erp_head;
        ccw_req_t     *erp_free = NULL;      /* req to be freed */    

	/* loop over successful ERPs and remove them from chanq */
	while ((erp_done != erp_match) &&
	       (erp_done != NULL)) {

#ifdef ERP_DEBUG
                DASD_MESSAGE (KERN_WARNING, device,
                              "successful ERP - dequeue and free request %p",
                              (void *) erp_done);
#endif /* ERP_DEBUG */

		check_then_set (&erp_done->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_DONE);

		/* remove the request from the device queue */
		dasd_chanq_deq (&device->queue,
				erp_done);

                erp_free = erp_done;
		erp_done = erp_done->refers;
                
		/* free the finished erp request */
		dasd_free_request (erp_free);

	}

	if (erp_done == NULL) 	/* erp_done should never be NULL! */
		panic (PRINTK_HEADER "Programming error in ERP! The original "
                       "request was lost\n");

#ifdef ERP_DEBUG
	/* handle matching ERP */
        DASD_MESSAGE (KERN_WARNING, device,
                      "handle matching erp %p",
                      (void *) erp_done);
#endif
        
        if (erp_done->retries > 0) {
                
                /* check for special retries */
                if (erp_done->function == dasd_3990_erp_action_4) {
                        char *sense = erp_done->dstat->ii.sense.data;
                        erp_done = dasd_3990_erp_action_4 (erp_done,
                                                           sense);
                        
                } else if (erp_done->function == dasd_3990_erp_action_1B_32) {
                        char *sense = erp_done->dstat->ii.sense.data;
                        erp_done = dasd_3990_update_1B (erp_done,
                                                        sense);

#ifdef ERP_FULL_ERP
                } else if (erp_done->function == dasd_3990_erp_int_req) {
                        erp_done = dasd_3990_erp_int_req (erp_done);
#endif /* ERP_FULL_ERP */  
                        
                } else {
                        /* simple retry   */
                        DASD_MESSAGE (KERN_WARNING, device,
                                      "%i retries left for erp %p",
                                      erp_done->retries,
                                      (void *) erp_done);
                        
                        /* handle the request again... */
                        check_then_set (&erp_done->status,
                                        CQR_STATUS_ERROR,
                                        CQR_STATUS_QUEUED);
                }
        } else {
                /* no retry left - check for further necessary action    */
                /* if no further actions, handle rest as permanent error */
                erp_done = dasd_3990_erp_further_erp (erp_done);
	}

        erp_head = erp_done;

} /* end dasd_3990_erp_handle_match_erp */

/*
 * DASD_3990_ERP_ACTION
 *
 * DESCRIPTION
 *   controll routine for 3990 erp actions.
 *   Has to be called with the queue lock (namely the s390_irq_lock) acquired.
 *
 * PARAMETER
 *   cqr                failed cqr (either original cqr or already an erp)
 *
 * RETURN VALUES
 *   erp                erp-pointer to the head of the ERP action chain.
 *                      This means:
 *                       - either a ptr to an additional ERP cqr or
 *                       - the original given cqr (which's status might be modified)
 */
ccw_req_t *
dasd_3990_erp_action (ccw_req_t *cqr)
{
	ccw_req_t     *erp    = NULL;
	dasd_device_t *device = cqr->device;

#ifdef ERP_DEBUG 
        __u32 cpa = cqr->dstat->cpa;    
#endif /* ERP_DEBUG */

#ifdef ERP_DEBUG 

	printk (KERN_WARNING PRINTK_HEADER
		"entering 3990 ERP for "
		"0x%04X on sch %d = /dev/%s \n",
		device->devinfo.devno,
		device->devinfo.irq,
		device->name);

	/* print current erp_chain */
        DASD_MESSAGE (KERN_WARNING, device,
                      "%s",
                      "ERP chain at BEGINNING of ERP-ACTION");
        {
                ccw_req_t *temp_erp = NULL;
                for (temp_erp = cqr; 
                     temp_erp != NULL; 
                     temp_erp = temp_erp->refers){

                        DASD_MESSAGE (KERN_WARNING, device,
                                      "      erp %p refers to %p \n",
                                      temp_erp,
                                      temp_erp->refers);
                }
        } 
#endif

	/* double-check if current erp/cqr was successfull */
	if ((cqr->dstat->cstat == 0x00) &&
	    (cqr->dstat->dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
                DASD_MESSAGE (KERN_WARNING, device,
                              "ERP called for successful request %p"
                              " - NO ERP necessary",
                              cqr);
                
                check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_DONE);

		return cqr;
	}
	/* check if sense data are available */
	if (!cqr->dstat->ii.sense.data) {
		DASD_MESSAGE (KERN_WARNING, device,
			"ERP called witout sense data avail ..."
			"request %p - NO ERP possible",
			cqr);

                check_then_set (&erp->status,
                                CQR_STATUS_ERROR,
                                CQR_STATUS_FAILED);

		return cqr; 

	}

	/* check if error happened before */
	erp = dasd_3990_erp_in_erp (cqr);

	if (erp == NULL) {
		/* no matching erp found - set up erp */
		erp = dasd_3990_erp_additional_erp (cqr);
	} else {
		/* matching erp found - set all leading erp's to DONE */
		dasd_3990_erp_handle_match_erp (cqr, erp);
		erp = cqr;
	}

#ifdef ERP_DEBUG
	/* print current erp_chain */
        DASD_MESSAGE (KERN_WARNING, device,
                      "%s",
                      "ERP chain at END of ERP-ACTION");
        {
                ccw_req_t *temp_erp = NULL;
                for (temp_erp = erp; 
                     temp_erp != NULL; 
                     temp_erp = temp_erp->refers){

                        DASD_MESSAGE (KERN_WARNING, device,
                                      "      erp %p refers to %p \n",
                                      temp_erp,
                                      temp_erp->refers);
                }
        }
#endif /* ERP_DEBUG */

#ifdef ERP_DEBUG
        if (erp->status == CQR_STATUS_FAILED) {
                log_erp_chain (erp, 1, cpa);
        }
#endif /* ERP_DEBUG */

	return erp;

} /* end dasd_3990_erp_action */

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-indent-level: 4 
 * c-brace-imaginary-offset: 0
 * c-brace-offset: -4
 * c-argdecl-indent: 4
 * c-label-offset: -4
 * c-continued-statement-offset: 4
 * c-continued-brace-offset: 0
 * indent-tabs-mode: nil
 * tab-width: 8
 * End:
 */
