LXR linux/drivers/s390/block/dasd

   1/*
   2 * File...........: linux/drivers/s390/block/dasd.c
   3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4 *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5 *                  Carsten Otte <Cotte@de.ibm.com>
   6 *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7 * Bugreports.to..: <Linux390@de.ibm.com>
   8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
   9 *
  10 */
  11
  12#define KMSG_COMPONENT "dasd"
  13
  14#include <linux/ctype.h>
  15#include <linux/init.h>
  16
  17#include <asm/debug.h>
  18#include <asm/ebcdic.h>
  19#include <asm/uaccess.h>
  20
  21/* This is ugly... */
  22#define PRINTK_HEADER "dasd_erp:"
  23
  24#include "dasd_int.h"
  25
  26struct dasd_ccw_req *
  27dasd_alloc_erp_request(char *magic, int cplength, int datasize,
  28                       struct dasd_device * device)
  29{
  30        unsigned long flags;
  31        struct dasd_ccw_req *cqr;
  32        char *data;
  33        int size;
  34
  35        /* Sanity checks */
  36        BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
  37             (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
  38
  39        size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
  40        if (cplength > 0)
  41                size += cplength * sizeof(struct ccw1);
  42        if (datasize > 0)
  43                size += datasize;
  44        spin_lock_irqsave(&device->mem_lock, flags);
  45        cqr = (struct dasd_ccw_req *)
  46                dasd_alloc_chunk(&device->erp_chunks, size);
  47        spin_unlock_irqrestore(&device->mem_lock, flags);
  48        if (cqr == NULL)
  49                return ERR_PTR(-ENOMEM);
  50        memset(cqr, 0, sizeof(struct dasd_ccw_req));
  51        INIT_LIST_HEAD(&cqr->devlist);
  52        INIT_LIST_HEAD(&cqr->blocklist);
  53        data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
  54        cqr->cpaddr = NULL;
  55        if (cplength > 0) {
  56                cqr->cpaddr = (struct ccw1 *) data;
  57                data += cplength*sizeof(struct ccw1);
  58                memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
  59        }
  60        cqr->data = NULL;
  61        if (datasize > 0) {
  62                cqr->data = data;
  63                memset(cqr->data, 0, datasize);
  64        }
  65        strncpy((char *) &cqr->magic, magic, 4);
  66        ASCEBC((char *) &cqr->magic, 4);
  67        set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
  68        dasd_get_device(device);
  69        return cqr;
  70}
  71
  72void
  73dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device)
  74{
  75        unsigned long flags;
  76
  77        spin_lock_irqsave(&device->mem_lock, flags);
  78        dasd_free_chunk(&device->erp_chunks, cqr);
  79        spin_unlock_irqrestore(&device->mem_lock, flags);
  80        atomic_dec(&device->ref_count);
  81}
  82
  83
  84/*
  85 * dasd_default_erp_action just retries the current cqr
  86 */
  87struct dasd_ccw_req *
  88dasd_default_erp_action(struct dasd_ccw_req *cqr)
  89{
  90        struct dasd_device *device;
  91
  92        device = cqr->startdev;
  93
  94        /* just retry - there is nothing to save ... I got no sense data.... */
  95        if (cqr->retries > 0) {
  96                DBF_DEV_EVENT(DBF_DEBUG, device,
  97                             "default ERP called (%i retries left)",
  98                             cqr->retries);
  99                if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
 100                        cqr->lpm = device->path_data.opm;
 101                cqr->status = DASD_CQR_FILLED;
 102        } else {
 103                pr_err("%s: default ERP has run out of retries and failed\n",
 104                       dev_name(&device->cdev->dev));
 105                cqr->status = DASD_CQR_FAILED;
 106                cqr->stopclk = get_clock();
 107        }
 108        return cqr;
 109}                               /* end dasd_default_erp_action */
 110
 111/*
 112 * DESCRIPTION
 113 *   Frees all ERPs of the current ERP Chain and set the status
 114 *   of the original CQR either to DASD_CQR_DONE if ERP was successful
 115 *   or to DASD_CQR_FAILED if ERP was NOT successful.
 116 *   NOTE: This function is only called if no discipline postaction
 117 *         is available
 118 *
 119 * PARAMETER
 120 *   erp                current erp_head
 121 *
 122 * RETURN VALUES
 123 *   cqr                pointer to the original CQR
 124 */
 125struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
 126{
 127        int success;
 128
 129        BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 130
 131        success = cqr->status == DASD_CQR_DONE;
 132
 133        /* free all ERPs - but NOT the original cqr */
 134        while (cqr->refers != NULL) {
 135                struct dasd_ccw_req *refers;
 136
 137                refers = cqr->refers;
 138                /* remove the request from the block queue */
 139                list_del(&cqr->blocklist);
 140                /* free the finished erp request */
 141                dasd_free_erp_request(cqr, cqr->memdev);
 142                cqr = refers;
 143        }
 144
 145        /* set corresponding status to original cqr */
 146        if (success)
 147                cqr->status = DASD_CQR_DONE;
 148        else {
 149                cqr->status = DASD_CQR_FAILED;
 150                cqr->stopclk = get_clock();
 151        }
 152
 153        return cqr;
 154
 155}                               /* end default_erp_postaction */
 156
 157void
 158dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 159{
 160        struct dasd_device *device;
 161
 162        device = cqr->startdev;
 163        /* dump sense data */
 164        if (device->discipline && device->discipline->dump_sense)
 165                device->discipline->dump_sense(device, cqr, irb);
 166}
 167
 168void
 169dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
 170{
 171        struct dasd_device *device;
 172
 173        device = cqr->startdev;
 174        /* dump sense data to s390 debugfeature*/
 175        if (device->discipline && device->discipline->dump_sense_dbf)
 176                device->discipline->dump_sense_dbf(device, irb, "log");
 177}
 178EXPORT_SYMBOL(dasd_log_sense_dbf);
 179
 180EXPORT_SYMBOL(dasd_default_erp_action);
 181EXPORT_SYMBOL(dasd_default_erp_postaction);
 182EXPORT_SYMBOL(dasd_alloc_erp_request);
 183EXPORT_SYMBOL(dasd_free_erp_request);
 184EXPORT_SYMBOL(dasd_log_sense);
 185
 186