kernel/drivers/s390/block/dasd_erp.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999, 2001
   8  *
   9  */
  10
  11 #define KMSG_COMPONENT "dasd"
  12
  13 #include <linux/ctype.h>
  14 #include <linux/init.h>
  15
  16 #include <asm/debug.h>
  17 #include <asm/ebcdic.h>
  18 #include <asm/uaccess.h>
  19
  20 /* This is ugly... */
  21 #define PRINTK_HEADER "dasd_erp:"
  22
  23 #include "dasd_int.h"
  24
  25 struct dasd_ccw_req *
  26 dasd_alloc_erp_request(char *magic, int cplength, int datasize,
  27                        struct dasd_device * device)
  28 {
  29         unsigned long flags;
  30         struct dasd_ccw_req *cqr;
  31         char *data;
  32         int size;
  33
  34         /* Sanity checks */
  35         BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
  36              (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
  37
  38         size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
  39         if (cplength > 0)
  40                 size += cplength * sizeof(struct ccw1);
  41         if (datasize > 0)
  42                 size += datasize;
  43         spin_lock_irqsave(&device->mem_lock, flags);
  44         cqr = (struct dasd_ccw_req *)
  45                 dasd_alloc_chunk(&device->erp_chunks, size);
  46         spin_unlock_irqrestore(&device->mem_lock, flags);
  47         if (cqr == NULL)
  48                 return ERR_PTR(-ENOMEM);
  49         memset(cqr, 0, sizeof(struct dasd_ccw_req));
  50         INIT_LIST_HEAD(&cqr->devlist);
  51         INIT_LIST_HEAD(&cqr->blocklist);
  52         data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
  53         cqr->cpaddr = NULL;
  54         if (cplength > 0) {
  55                 cqr->cpaddr = (struct ccw1 *) data;
  56                 data += cplength*sizeof(struct ccw1);
  57                 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
  58         }
  59         cqr->data = NULL;
  60         if (datasize > 0) {
  61                 cqr->data = data;
  62                 memset(cqr->data, 0, datasize);
  63         }
  64         strncpy((char *) &cqr->magic, magic, 4);
  65         ASCEBC((char *) &cqr->magic, 4);
  66         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
  67         dasd_get_device(device);
  68         return cqr;
  69 }
  70
  71 void
  72 dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device)
  73 {
  74         unsigned long flags;
  75
  76         spin_lock_irqsave(&device->mem_lock, flags);
  77         dasd_free_chunk(&device->erp_chunks, cqr);
  78         spin_unlock_irqrestore(&device->mem_lock, flags);
  79         atomic_dec(&device->ref_count);
  80 }
  81
  82
  83 /*
  84  * dasd_default_erp_action just retries the current cqr
  85  */
  86 struct dasd_ccw_req *
  87 dasd_default_erp_action(struct dasd_ccw_req *cqr)
  88 {
  89         struct dasd_device *device;
  90
  91         device = cqr->startdev;
  92
  93         /* just retry - there is nothing to save ... I got no sense data.... */
  94         if (cqr->retries > 0) {
  95                 DBF_DEV_EVENT(DBF_DEBUG, device,
  96                              "default ERP called (%i retries left)",
  97                              cqr->retries);
  98                 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
  99                         cqr->lpm = device->path_data.opm;
 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_tod_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         unsigned long long startclk, stopclk;
 128         struct dasd_device *startdev;
 129
 130         BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 131
 132         success = cqr->status == DASD_CQR_DONE;
 133         startclk = cqr->startclk;
 134         stopclk = cqr->stopclk;
 135         startdev = cqr->startdev;
 136
 137         /* free all ERPs - but NOT the original cqr */
 138         while (cqr->refers != NULL) {
 139                 struct dasd_ccw_req *refers;
 140
 141                 refers = cqr->refers;
 142                 /* remove the request from the block queue */
 143                 list_del(&cqr->blocklist);
 144                 /* free the finished erp request */
 145                 dasd_free_erp_request(cqr, cqr->memdev);
 146                 cqr = refers;
 147         }
 148
 149         /* set corresponding status to original cqr */
 150         cqr->startclk = startclk;
 151         cqr->stopclk = stopclk;
 152         cqr->startdev = startdev;
 153         if (success)
 154                 cqr->status = DASD_CQR_DONE;
 155         else {
 156                 cqr->status = DASD_CQR_FAILED;
 157                 cqr->stopclk = get_tod_clock();
 158         }
 159
 160         return cqr;
 161
 162 }                               /* end default_erp_postaction */
 163
 164 void
 165 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 166 {
 167         struct dasd_device *device;
 168
 169         device = cqr->startdev;
 170         if (cqr->intrc == -ETIMEDOUT) {
 171                 dev_err(&device->cdev->dev,
 172                         "A timeout error occurred for cqr %p", cqr);
 173                 return;
 174         }
 175         if (cqr->intrc == -ENOLINK) {
 176                 dev_err(&device->cdev->dev,
 177                         "A transport error occurred for cqr %p", cqr);
 178                 return;
 179         }
 180         /* dump sense data */
 181         if (device->discipline && device->discipline->dump_sense)
 182                 device->discipline->dump_sense(device, cqr, irb);
 183 }
 184
 185 void
 186 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
 187 {
 188         struct dasd_device *device;
 189
 190         device = cqr->startdev;
 191         /* dump sense data to s390 debugfeature*/
 192         if (device->discipline && device->discipline->dump_sense_dbf)
 193                 device->discipline->dump_sense_dbf(device, irb, "log");
 194 }
 195 EXPORT_SYMBOL(dasd_log_sense_dbf);
 196
 197 EXPORT_SYMBOL(dasd_default_erp_action);
 198 EXPORT_SYMBOL(dasd_default_erp_postaction);
 199 EXPORT_SYMBOL(dasd_alloc_erp_request);
 200 EXPORT_SYMBOL(dasd_free_erp_request);
 201 EXPORT_SYMBOL(dasd_log_sense);
 202