LXR linux/drivers/s390/block/dasd

   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#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 <linux/uaccess.h>
  20
  21/* This is ugly... */
  22#define PRINTK_HEADER "dasd_erp:"
  23
  24#include "dasd_int.h"
  25
  26struct dasd_ccw_req *
  27dasd_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
  72void
  73dasd_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 */
  87struct dasd_ccw_req *
  88dasd_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                if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
 100                        cqr->lpm = dasd_path_get_opm(device);
 101                cqr->status = DASD_CQR_FILLED;
 102        } else {
 103                pr_err("%s: default ERP has run out of retries and failed\n",
 104                       dev_name(&device->cdev->dev));
 105                cqr->status = DASD_CQR_FAILED;
 106                cqr->stopclk = get_tod_clock();
 107        }
 108        return cqr;
 109}                               /* end dasd_default_erp_action */
 110
 111/*
 112 * DESCRIPTION
 113 *   Frees all ERPs of the current ERP Chain and set the status
 114 *   of the original CQR either to DASD_CQR_DONE if ERP was successful
 115 *   or to DASD_CQR_FAILED if ERP was NOT successful.
 116 *   NOTE: This function is only called if no discipline postaction
 117 *         is available
 118 *
 119 * PARAMETER
 120 *   erp                current erp_head
 121 *
 122 * RETURN VALUES
 123 *   cqr                pointer to the original CQR
 124 */
 125struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *cqr)
 126{
 127        int success;
 128        unsigned long startclk, stopclk;
 129        struct dasd_device *startdev;
 130
 131        BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 132
 133        success = cqr->status == DASD_CQR_DONE;
 134        startclk = cqr->startclk;
 135        stopclk = cqr->stopclk;
 136        startdev = cqr->startdev;
 137
 138        /* free all ERPs - but NOT the original cqr */
 139        while (cqr->refers != NULL) {
 140                struct dasd_ccw_req *refers;
 141
 142                refers = cqr->refers;
 143                /* remove the request from the block queue */
 144                list_del(&cqr->blocklist);
 145                /* free the finished erp request */
 146                dasd_free_erp_request(cqr, cqr->memdev);
 147                cqr = refers;
 148        }
 149
 150        /* set corresponding status to original cqr */
 151        cqr->startclk = startclk;
 152        cqr->stopclk = stopclk;
 153        cqr->startdev = startdev;
 154        if (success)
 155                cqr->status = DASD_CQR_DONE;
 156        else {
 157                cqr->status = DASD_CQR_FAILED;
 158                cqr->stopclk = get_tod_clock();
 159        }
 160
 161        return cqr;
 162
 163}                               /* end default_erp_postaction */
 164
 165void
 166dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 167{
 168        struct dasd_device *device;
 169
 170        device = cqr->startdev;
 171        if (cqr->intrc == -ETIMEDOUT) {
 172                dev_err(&device->cdev->dev,
 173                        "A timeout error occurred for cqr %p\n", cqr);
 174                return;
 175        }
 176        if (cqr->intrc == -ENOLINK) {
 177                dev_err(&device->cdev->dev,
 178                        "A transport error occurred for cqr %p\n", cqr);
 179                return;
 180        }
 181        /* dump sense data */
 182        if (device->discipline && device->discipline->dump_sense)
 183                device->discipline->dump_sense(device, cqr, irb);
 184}
 185
 186void
 187dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb)
 188{
 189        struct dasd_device *device;
 190
 191        device = cqr->startdev;
 192        /* dump sense data to s390 debugfeature*/
 193        if (device->discipline && device->discipline->dump_sense_dbf)
 194                device->discipline->dump_sense_dbf(device, irb, "log");
 195}
 196EXPORT_SYMBOL(dasd_log_sense_dbf);
 197
 198EXPORT_SYMBOL(dasd_default_erp_action);
 199EXPORT_SYMBOL(dasd_default_erp_postaction);
 200EXPORT_SYMBOL(dasd_alloc_erp_request);
 201EXPORT_SYMBOL(dasd_free_erp_request);
 202EXPORT_SYMBOL(dasd_log_sense);
 203
 204