drivers/s390/block/dasd_erp.c

   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
  26 struct dasd_ccw_req *
  27 dasd_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
  72 void
  73 dasd_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  */
  87 struct dasd_ccw_req *
  88 dasd_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                 cqr->lpm    = LPM_ANYPATH;
 100                 cqr->status = DASD_CQR_FILLED;
 101         } else {
 102                 pr_err("%s: default ERP has run out of retries and failed\n",
 103                        dev_name(&device->cdev->dev));
 104                 cqr->status = DASD_CQR_FAILED;
 105                 cqr->stopclk = get_clock();
 106         }
 107         return cqr;
 108 }                               /* end dasd_default_erp_action */
 109
 110 /*
 111  * DESCRIPTION
 112  *   Frees all ERPs of the current ERP Chain and set the status
 113  *   of the original CQR either to DASD_CQR_DONE if ERP was successful
 114  *   or to DASD_CQR_FAILED if ERP was NOT successful.
 115  *   NOTE: This function is only called if no discipline postaction
 116  *         is available
 117  *
 118  * PARAMETER
 119  *   erp                current erp_head
 120  *
 121  * RETURN VALUES
 122  *   cqr                pointer to the original CQR
 123  */
 124 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
 125 {
 126         int success;
 127
 128         BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 129
 130         success = cqr->status == DASD_CQR_DONE;
 131
 132         /* free all ERPs - but NOT the original cqr */
 133         while (cqr->refers != NULL) {
 134                 struct dasd_ccw_req *refers;
 135
 136                 refers = cqr->refers;
 137                 /* remove the request from the block queue */
 138                 list_del(&cqr->blocklist);
 139                 /* free the finished erp request */
 140                 dasd_free_erp_request(cqr, cqr->memdev);
 141                 cqr = refers;
 142         }
 143
 144         /* set corresponding status to original cqr */
 145         if (success)
 146                 cqr->status = DASD_CQR_DONE;
 147         else {
 148                 cqr->status = DASD_CQR_FAILED;
 149                 cqr->stopclk = get_clock();
 150         }
 151
 152         return cqr;
 153
 154 }                               /* end default_erp_postaction */
 155
 156 void
 157 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 158 {
 159         struct dasd_device *device;
 160
 161         device = cqr->startdev;
 162         /* dump sense data */
 163         if (device->discipline && device->discipline->dump_sense)
 164                 device->discipline->dump_sense(device, cqr, irb);
 165 }
 166
 167 void
 168 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
 169 {
 170         struct dasd_device *device;
 171
 172         device = cqr->startdev;
 173         /* dump sense data to s390 debugfeature*/
 174         if (device->discipline && device->discipline->dump_sense_dbf)
 175                 device->discipline->dump_sense_dbf(device, irb, "log");
 176 }
 177 EXPORT_SYMBOL(dasd_log_sense_dbf);
 178
 179 EXPORT_SYMBOL(dasd_default_erp_action);
 180 EXPORT_SYMBOL(dasd_default_erp_postaction);
 181 EXPORT_SYMBOL(dasd_alloc_erp_request);
 182 EXPORT_SYMBOL(dasd_free_erp_request);
 183 EXPORT_SYMBOL(dasd_log_sense);
 184