git.oblomov.eu Git - linux-2.6/blob - 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 #include <linux/ctype.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/debug.h>
  16 #include <asm/ebcdic.h>
  17 #include <asm/uaccess.h>
  18
  19 /* This is ugly... */
  20 #define PRINTK_HEADER "dasd_erp:"
  21
  22 #include "dasd_int.h"
  23
  24 struct dasd_ccw_req *
  25 dasd_alloc_erp_request(char *magic, int cplength, int datasize,
  26                        struct dasd_device * device)
  27 {
  28         unsigned long flags;
  29         struct dasd_ccw_req *cqr;
  30         char *data;
  31         int size;
  32
  33         /* Sanity checks */
  34         BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
  35              (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
  36
  37         size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
  38         if (cplength > 0)
  39                 size += cplength * sizeof(struct ccw1);
  40         if (datasize > 0)
  41                 size += datasize;
  42         spin_lock_irqsave(&device->mem_lock, flags);
  43         cqr = (struct dasd_ccw_req *)
  44                 dasd_alloc_chunk(&device->erp_chunks, size);
  45         spin_unlock_irqrestore(&device->mem_lock, flags);
  46         if (cqr == NULL)
  47                 return ERR_PTR(-ENOMEM);
  48         memset(cqr, 0, sizeof(struct dasd_ccw_req));
  49         INIT_LIST_HEAD(&cqr->devlist);
  50         INIT_LIST_HEAD(&cqr->blocklist);
  51         data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
  52         cqr->cpaddr = NULL;
  53         if (cplength > 0) {
  54                 cqr->cpaddr = (struct ccw1 *) data;
  55                 data += cplength*sizeof(struct ccw1);
  56                 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
  57         }
  58         cqr->data = NULL;
  59         if (datasize > 0) {
  60                 cqr->data = data;
  61                 memset(cqr->data, 0, datasize);
  62         }
  63         strncpy((char *) &cqr->magic, magic, 4);
  64         ASCEBC((char *) &cqr->magic, 4);
  65         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
  66         dasd_get_device(device);
  67         return cqr;
  68 }
  69
  70 void
  71 dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device)
  72 {
  73         unsigned long flags;
  74
  75         spin_lock_irqsave(&device->mem_lock, flags);
  76         dasd_free_chunk(&device->erp_chunks, cqr);
  77         spin_unlock_irqrestore(&device->mem_lock, flags);
  78         atomic_dec(&device->ref_count);
  79 }
  80
  81
  82 /*
  83  * dasd_default_erp_action just retries the current cqr
  84  */
  85 struct dasd_ccw_req *
  86 dasd_default_erp_action(struct dasd_ccw_req *cqr)
  87 {
  88         struct dasd_device *device;
  89
  90         device = cqr->startdev;
  91
  92         /* just retry - there is nothing to save ... I got no sense data.... */
  93         if (cqr->retries > 0) {
  94                 DEV_MESSAGE (KERN_DEBUG, device,
  95                              "default ERP called (%i retries left)",
  96                              cqr->retries);
  97                 cqr->lpm    = LPM_ANYPATH;
  98                 cqr->status = DASD_CQR_FILLED;
  99         } else {
 100                 DEV_MESSAGE (KERN_WARNING, device, "%s",
 101                              "default ERP called (NO retry left)");
 102                 cqr->status = DASD_CQR_FAILED;
 103                 cqr->stopclk = get_clock();
 104         }
 105         return cqr;
 106 }                               /* end dasd_default_erp_action */
 107
 108 /*
 109  * DESCRIPTION
 110  *   Frees all ERPs of the current ERP Chain and set the status
 111  *   of the original CQR either to DASD_CQR_DONE if ERP was successful
 112  *   or to DASD_CQR_FAILED if ERP was NOT successful.
 113  *   NOTE: This function is only called if no discipline postaction
 114  *         is available
 115  *
 116  * PARAMETER
 117  *   erp                current erp_head
 118  *
 119  * RETURN VALUES
 120  *   cqr                pointer to the original CQR
 121  */
 122 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
 123 {
 124         int success;
 125
 126         BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 127
 128         success = cqr->status == DASD_CQR_DONE;
 129
 130         /* free all ERPs - but NOT the original cqr */
 131         while (cqr->refers != NULL) {
 132                 struct dasd_ccw_req *refers;
 133
 134                 refers = cqr->refers;
 135                 /* remove the request from the block queue */
 136                 list_del(&cqr->blocklist);
 137                 /* free the finished erp request */
 138                 dasd_free_erp_request(cqr, cqr->memdev);
 139                 cqr = refers;
 140         }
 141
 142         /* set corresponding status to original cqr */
 143         if (success)
 144                 cqr->status = DASD_CQR_DONE;
 145         else {
 146                 cqr->status = DASD_CQR_FAILED;
 147                 cqr->stopclk = get_clock();
 148         }
 149
 150         return cqr;
 151
 152 }                               /* end default_erp_postaction */
 153
 154 void
 155 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 156 {
 157         struct dasd_device *device;
 158
 159         device = cqr->startdev;
 160         /* dump sense data */
 161         if (device->discipline && device->discipline->dump_sense)
 162                 device->discipline->dump_sense(device, cqr, irb);
 163 }
 164
 165 EXPORT_SYMBOL(dasd_default_erp_action);
 166 EXPORT_SYMBOL(dasd_default_erp_postaction);
 167 EXPORT_SYMBOL(dasd_alloc_erp_request);
 168 EXPORT_SYMBOL(dasd_free_erp_request);
 169 EXPORT_SYMBOL(dasd_log_sense);