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/config.h>
  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         if ( magic == NULL || datasize > PAGE_SIZE ||
  36              (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
  37                 BUG();
  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         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->device;
  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_QUEUED;
  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 *
 123 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
 124 {
 125         struct dasd_device *device;
 126         int success;
 127
 128         if (cqr->refers == NULL || cqr->function == NULL)
 129                 BUG();
 130
 131         device = cqr->device;
 132         success = cqr->status == DASD_CQR_DONE;
 133
 134         /* free all ERPs - but NOT the original cqr */
 135         while (cqr->refers != NULL) {
 136                 struct dasd_ccw_req *refers;
 137
 138                 refers = cqr->refers;
 139                 /* remove the request from the device queue */
 140                 list_del(&cqr->list);
 141                 /* free the finished erp request */
 142                 dasd_free_erp_request(cqr, device);
 143                 cqr = refers;
 144         }
 145
 146         /* set corresponding status to original cqr */
 147         if (success)
 148                 cqr->status = DASD_CQR_DONE;
 149         else {
 150                 cqr->status = DASD_CQR_FAILED;
 151                 cqr->stopclk = get_clock();
 152         }
 153
 154         return cqr;
 155
 156 }                               /* end default_erp_postaction */
 157
 158 /*
 159  * Print the hex dump of the memory used by a request. This includes
 160  * all error recovery ccws that have been chained in from of the
 161  * real request.
 162  */
 163 static inline void
 164 hex_dump_memory(struct dasd_device *device, void *data, int len)
 165 {
 166         int *pint;
 167
 168         pint = (int *) data;
 169         while (len > 0) {
 170                 DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
 171                             pint, pint[0], pint[1], pint[2], pint[3]);
 172                 pint += 4;
 173                 len -= 16;
 174         }
 175 }
 176
 177 void
 178 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 179 {
 180         struct dasd_device *device;
 181
 182         device = cqr->device;
 183         /* dump sense data */
 184         if (device->discipline && device->discipline->dump_sense)
 185                 device->discipline->dump_sense(device, cqr, irb);
 186 }
 187
 188 void
 189 dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
 190 {
 191         struct dasd_device *device;
 192         struct dasd_ccw_req *lcqr;
 193         struct ccw1 *ccw;
 194         int cplength;
 195
 196         device = cqr->device;
 197         /* log the channel program */
 198         for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
 199                 DEV_MESSAGE(KERN_ERR, device,
 200                             "(%s) ERP chain report for req: %p",
 201                             caller == 0 ? "EXAMINE" : "ACTION", lcqr);
 202                 hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
 203
 204                 cplength = 1;
 205                 ccw = lcqr->cpaddr;
 206                 while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
 207                         cplength++;
 208
 209                 if (cplength > 40) {    /* log only parts of the CP */
 210                         DEV_MESSAGE(KERN_ERR, device, "%s",
 211                                     "Start of channel program:");
 212                         hex_dump_memory(device, lcqr->cpaddr,
 213                                         40*sizeof(struct ccw1));
 214
 215                         DEV_MESSAGE(KERN_ERR, device, "%s",
 216                                     "End of channel program:");
 217                         hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
 218                                         10*sizeof(struct ccw1));
 219                 } else {        /* log the whole CP */
 220                         DEV_MESSAGE(KERN_ERR, device, "%s",
 221                                     "Channel program (complete):");
 222                         hex_dump_memory(device, lcqr->cpaddr,
 223                                         cplength*sizeof(struct ccw1));
 224                 }
 225
 226                 if (lcqr != cqr)
 227                         continue;
 228
 229                 /*
 230                  * Log bytes arround failed CCW but only if we did
 231                  * not log the whole CP of the CCW is outside the
 232                  * logged CP.
 233                  */
 234                 if (cplength > 40 ||
 235                     ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
 236                      (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
 237
 238                         DEV_MESSAGE(KERN_ERR, device,
 239                                     "Failed CCW (%p) (area):",
 240                                     (void *) (long) cpa);
 241                         hex_dump_memory(device, cqr->cpaddr - 10,
 242                                         20*sizeof(struct ccw1));
 243                 }
 244         }
 245
 246 }                               /* end log_erp_chain */
 247
 248 EXPORT_SYMBOL(dasd_default_erp_action);
 249 EXPORT_SYMBOL(dasd_default_erp_postaction);
 250 EXPORT_SYMBOL(dasd_alloc_erp_request);
 251 EXPORT_SYMBOL(dasd_free_erp_request);
 252 EXPORT_SYMBOL(dasd_log_sense);
 253 EXPORT_SYMBOL(dasd_log_ccw);