drivers/s390/block/dasd_erp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   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  * Copyright IBM Corp. 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 <linux/uaccess.h>
  18
  19 #include "dasd_int.h"
  20
  21 struct dasd_ccw_req *
  22 dasd_alloc_erp_request(unsigned int magic, int cplength, int datasize,
  23                        struct dasd_device * device)
  24 {
  25         unsigned long flags;
  26         struct dasd_ccw_req *cqr;
  27         char *data;
  28         int size;
  29
  30         /* Sanity checks */
  31         BUG_ON(datasize > PAGE_SIZE ||
  32                (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
  33
  34         size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
  35         if (cplength > 0)
  36                 size += cplength * sizeof(struct ccw1);
  37         if (datasize > 0)
  38                 size += datasize;
  39         spin_lock_irqsave(&device->mem_lock, flags);
  40         cqr = (struct dasd_ccw_req *)
  41                 dasd_alloc_chunk(&device->erp_chunks, size);
  42         spin_unlock_irqrestore(&device->mem_lock, flags);
  43         if (cqr == NULL)
  44                 return ERR_PTR(-ENOMEM);
  45         memset(cqr, 0, sizeof(struct dasd_ccw_req));
  46         INIT_LIST_HEAD(&cqr->devlist);
  47         INIT_LIST_HEAD(&cqr->blocklist);
  48         data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
  49         cqr->cpaddr = NULL;
  50         if (cplength > 0) {
  51                 cqr->cpaddr = (struct ccw1 *) data;
  52                 data += cplength*sizeof(struct ccw1);
  53                 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
  54         }
  55         cqr->data = NULL;
  56         if (datasize > 0) {
  57                 cqr->data = data;
  58                 memset(cqr->data, 0, datasize);
  59         }
  60         cqr->magic = magic;
  61         ASCEBC((char *) &cqr->magic, 4);
  62         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
  63         dasd_get_device(device);
  64         return cqr;
  65 }
  66
  67 void
  68 dasd_free_erp_request(struct dasd_ccw_req *cqr, struct dasd_device * device)
  69 {
  70         unsigned long flags;
  71
  72         spin_lock_irqsave(&device->mem_lock, flags);
  73         dasd_free_chunk(&device->erp_chunks, cqr);
  74         spin_unlock_irqrestore(&device->mem_lock, flags);
  75         atomic_dec(&device->ref_count);
  76 }
  77
  78
  79 /*
  80  * dasd_default_erp_action just retries the current cqr
  81  */
  82 struct dasd_ccw_req *
  83 dasd_default_erp_action(struct dasd_ccw_req *cqr)
  84 {
  85         struct dasd_device *device;
  86
  87         device = cqr->startdev;
  88
  89         /* just retry - there is nothing to save ... I got no sense data.... */
  90         if (cqr->retries > 0) {
  91                 DBF_DEV_EVENT(DBF_DEBUG, device,
  92                              "default ERP called (%i retries left)",
  93                              cqr->retries);
  94                 if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
  95                         cqr->lpm = dasd_path_get_opm(device);
  96                 cqr->status = DASD_CQR_FILLED;
  97         } else {
  98                 pr_err("%s: default ERP has run out of retries and failed\n",
  99                        dev_name(&device->cdev->dev));
 100                 cqr->status = DASD_CQR_FAILED;
 101                 cqr->stopclk = get_tod_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 *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
 121 {
 122         int success;
 123         unsigned long startclk, stopclk;
 124         struct dasd_device *startdev;
 125
 126         BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 127
 128         success = cqr->status == DASD_CQR_DONE;
 129         startclk = cqr->startclk;
 130         stopclk = cqr->stopclk;
 131         startdev = cqr->startdev;
 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         cqr->startclk = startclk;
 147         cqr->stopclk = stopclk;
 148         cqr->startdev = startdev;
 149         if (success)
 150                 cqr->status = DASD_CQR_DONE;
 151         else {
 152                 cqr->status = DASD_CQR_FAILED;
 153                 cqr->stopclk = get_tod_clock();
 154         }
 155
 156         return cqr;
 157
 158 }                               /* end default_erp_postaction */
 159
 160 void
 161 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 162 {
 163         struct dasd_device *device;
 164
 165         device = cqr->startdev;
 166         if (cqr->intrc == -ETIMEDOUT) {
 167                 dev_err(&device->cdev->dev,
 168                         "A timeout error occurred for cqr %px\n", cqr);
 169                 return;
 170         }
 171         if (cqr->intrc == -ENOLINK) {
 172                 dev_err(&device->cdev->dev,
 173                         "A transport error occurred for cqr %px\n", cqr);
 174                 return;
 175         }
 176         /* dump sense data */
 177         if (device->discipline && device->discipline->dump_sense)
 178                 device->discipline->dump_sense(device, cqr, irb);
 179 }
 180
 181 void
 182 dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
 183 {
 184         struct dasd_device *device;
 185
 186         device = cqr->startdev;
 187         /* dump sense data to s390 debugfeature*/
 188         if (device->discipline && device->discipline->dump_sense_dbf)
 189                 device->discipline->dump_sense_dbf(device, irb, "log");
 190 }
 191 EXPORT_SYMBOL(dasd_log_sense_dbf);
 192
 193 EXPORT_SYMBOL(dasd_default_erp_action);
 194 EXPORT_SYMBOL(dasd_default_erp_postaction);
 195 EXPORT_SYMBOL(dasd_alloc_erp_request);
 196 EXPORT_SYMBOL(dasd_free_erp_request);
 197 EXPORT_SYMBOL(dasd_log_sense);
 198