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/*

 * File...........: linux/drivers/s390/block/dasd.c

 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>

 *                  Horst Hummel <Horst.Hummel@de.ibm.com>

 *                  Carsten Otte <Cotte@de.ibm.com>

 *                  Martin Schwidefsky <schwidefsky@de.ibm.com>

 * Bugreports.to..: <Linux390@de.ibm.com>

 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001

 *

 */

#include <linux/ctype.h>

#include <linux/init.h>

#include <asm/debug.h>

#include <asm/ebcdic.h>

#include <asm/uaccess.h>

/* This is ugly... */

#define PRINTK_HEADER "dasd_erp:"

#include "dasd_int.h"

struct dasd_ccw_req *

dasd_alloc_erp_request(char *magic, int cplength, int datasize,

                       struct dasd_device * device)

{

        unsigned long flags;

        struct dasd_ccw_req *cqr;

        char *data;

        int size;

        /* Sanity checks */

        BUG_ON( magic == NULL || datasize > PAGE_SIZE ||

             (cplength*sizeof(struct ccw1)) > PAGE_SIZE);

        size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;

        if (cplength > 0)

                size += cplength * sizeof(struct ccw1);

        if (datasize > 0)

                size += datasize;

        spin_lock_irqsave(&device->mem_lock, flags);

        cqr = (struct dasd_ccw_req *)

                dasd_alloc_chunk(&device->erp_chunks, size);

        spin_unlock_irqrestore(&device->mem_lock, flags);

        if (cqr == NULL)

                return ERR_PTR(-ENOMEM);

        memset(cqr, 0, sizeof(struct dasd_ccw_req));

        data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);

        cqr->cpaddr = NULL;

        if (cplength > 0) {

                cqr->cpaddr = (struct ccw1 *) data;

                data += cplength*sizeof(struct ccw1);

                memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));

        }

        cqr->data = NULL;

        if (datasize > 0) {

                cqr->data = data;

                memset(cqr->data, 0, datasize);

        }

        strncpy((char *) &cqr->magic, magic, 4);

        ASCEBC((char *) &cqr->magic, 4);

        set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);

        dasd_get_device(device);

        return cqr;

}

void

dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)

{

        unsigned long flags;

        spin_lock_irqsave(&device->mem_lock, flags);

        dasd_free_chunk(&device->erp_chunks, cqr);

        spin_unlock_irqrestore(&device->mem_lock, flags);

        atomic_dec(&device->ref_count);

}

/*

 * dasd_default_erp_action just retries the current cqr

 */

struct dasd_ccw_req *

dasd_default_erp_action(struct dasd_ccw_req * cqr)

{

        struct dasd_device *device;

        device = cqr->device;

        /* just retry - there is nothing to save ... I got no sense data.... */

        if (cqr->retries > 0) {

                DEV_MESSAGE (KERN_DEBUG, device,

                             "default ERP called (%i retries left)",

                             cqr->retries);

                cqr->lpm    = LPM_ANYPATH;

                cqr->status = DASD_CQR_QUEUED;

        } else {

                DEV_MESSAGE (KERN_WARNING, device, "%s",

                             "default ERP called (NO retry left)");

                cqr->status = DASD_CQR_FAILED;

                cqr->stopclk = get_clock ();

        }

        return cqr;

}                               /* end dasd_default_erp_action */

/*

 * DESCRIPTION

 *   Frees all ERPs of the current ERP Chain and set the status

 *   of the original CQR either to DASD_CQR_DONE if ERP was successful

 *   or to DASD_CQR_FAILED if ERP was NOT successful.

 *   NOTE: This function is only called if no discipline postaction

 *         is available

 *

 * PARAMETER

 *   erp                current erp_head

 *

 * RETURN VALUES

 *   cqr                pointer to the original CQR

 */

struct dasd_ccw_req *

dasd_default_erp_postaction(struct dasd_ccw_req * cqr)

{

        struct dasd_device *device;

        int success;

        BUG_ON(cqr->refers == NULL || cqr->function == NULL);

        device = cqr->device;

        success = cqr->status == DASD_CQR_DONE;

        /* free all ERPs - but NOT the original cqr */

        while (cqr->refers != NULL) {

                struct dasd_ccw_req *refers;

                refers = cqr->refers;

                /* remove the request from the device queue */

                list_del(&cqr->list);

                /* free the finished erp request */

                dasd_free_erp_request(cqr, device);

                cqr = refers;

        }

        /* set corresponding status to original cqr */

        if (success)

                cqr->status = DASD_CQR_DONE;

        else {

                cqr->status = DASD_CQR_FAILED;

                cqr->stopclk = get_clock();

        }

        return cqr;

}                               /* end default_erp_postaction */

void

dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)

{

        struct dasd_device *device;

        device = cqr->device;

        /* dump sense data */

        if (device->discipline && device->discipline->dump_sense)

                device->discipline->dump_sense(device, cqr, irb);

}

EXPORT_SYMBOL(dasd_default_erp_action);

EXPORT_SYMBOL(dasd_default_erp_postaction);

EXPORT_SYMBOL(dasd_alloc_erp_request);

EXPORT_SYMBOL(dasd_free_erp_request);

EXPORT_SYMBOL(dasd_log_sense);