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         data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
  50         cqr->cpaddr = NULL;
  51         if (cplength > 0) {
  52                 cqr->cpaddr = (struct ccw1 *) data;
  53                 data += cplength*sizeof(struct ccw1);
  54                 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
  55         }
  56         cqr->data = NULL;
  57         if (datasize > 0) {
  58                 cqr->data = data;
  59                 memset(cqr->data, 0, datasize);
  60         }
  61         strncpy((char *) &cqr->magic, magic, 4);
  62         ASCEBC((char *) &cqr->magic, 4);
  63         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
  64         dasd_get_device(device);
  65         return cqr;
  66 }
  67
  68 void
  69 dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
  70 {
  71         unsigned long flags;
  72
  73         spin_lock_irqsave(&device->mem_lock, flags);
  74         dasd_free_chunk(&device->erp_chunks, cqr);
  75         spin_unlock_irqrestore(&device->mem_lock, flags);
  76         atomic_dec(&device->ref_count);
  77 }
  78
  79
  80 /*
  81  * dasd_default_erp_action just retries the current cqr
  82  */
  83 struct dasd_ccw_req *
  84 dasd_default_erp_action(struct dasd_ccw_req * cqr)
  85 {
  86         struct dasd_device *device;
  87
  88         device = cqr->device;
  89
  90         /* just retry - there is nothing to save ... I got no sense data.... */
  91         if (cqr->retries > 0) {
  92                 DEV_MESSAGE (KERN_DEBUG, device,
  93                              "default ERP called (%i retries left)",
  94                              cqr->retries);
  95                 cqr->lpm    = LPM_ANYPATH;
  96                 cqr->status = DASD_CQR_QUEUED;
  97         } else {
  98                 DEV_MESSAGE (KERN_WARNING, device, "%s",
  99                              "default ERP called (NO retry left)");
 100                 cqr->status = DASD_CQR_FAILED;
 101                 cqr->stopclk = get_clock ();
 102         }
 103         return cqr;
 104 }                               /* end dasd_default_erp_action */
 105
 106 /*
 107  * DESCRIPTION
 108  *   Frees all ERPs of the current ERP Chain and set the status
 109  *   of the original CQR either to DASD_CQR_DONE if ERP was successful
 110  *   or to DASD_CQR_FAILED if ERP was NOT successful.
 111  *   NOTE: This function is only called if no discipline postaction
 112  *         is available
 113  *
 114  * PARAMETER
 115  *   erp                current erp_head
 116  *
 117  * RETURN VALUES
 118  *   cqr                pointer to the original CQR
 119  */
 120 struct dasd_ccw_req *
 121 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
 122 {
 123         struct dasd_device *device;
 124         int success;
 125
 126         BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 127
 128         device = cqr->device;
 129         success = cqr->status == DASD_CQR_DONE;
 130
 131         /* free all ERPs - but NOT the original cqr */
 132         while (cqr->refers != NULL) {
 133                 struct dasd_ccw_req *refers;
 134
 135                 refers = cqr->refers;
 136                 /* remove the request from the device queue */
 137                 list_del(&cqr->list);
 138                 /* free the finished erp request */
 139                 dasd_free_erp_request(cqr, device);
 140                 cqr = refers;
 141         }
 142
 143         /* set corresponding status to original cqr */
 144         if (success)
 145                 cqr->status = DASD_CQR_DONE;
 146         else {
 147                 cqr->status = DASD_CQR_FAILED;
 148                 cqr->stopclk = get_clock();
 149         }
 150
 151         return cqr;
 152
 153 }                               /* end default_erp_postaction */
 154
 155 void
 156 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 157 {
 158         struct dasd_device *device;
 159
 160         device = cqr->device;
 161         /* dump sense data */
 162         if (device->discipline && device->discipline->dump_sense)
 163                 device->discipline->dump_sense(device, cqr, irb);
 164 }
 165
 166 EXPORT_SYMBOL(dasd_default_erp_action);
 167 EXPORT_SYMBOL(dasd_default_erp_postaction);
 168 EXPORT_SYMBOL(dasd_alloc_erp_request);
 169 EXPORT_SYMBOL(dasd_free_erp_request);
 170 EXPORT_SYMBOL(dasd_log_sense);