git.oblomov.eu Git - linux-2.6/blob - 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         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         data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
  51         cqr->cpaddr = NULL;
  52         if (cplength > 0) {
  53                 cqr->cpaddr = (struct ccw1 *) data;
  54                 data += cplength*sizeof(struct ccw1);
  55                 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
  56         }
  57         cqr->data = NULL;
  58         if (datasize > 0) {
  59                 cqr->data = data;
  60                 memset(cqr->data, 0, datasize);
  61         }
  62         strncpy((char *) &cqr->magic, magic, 4);
  63         ASCEBC((char *) &cqr->magic, 4);
  64         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
  65         dasd_get_device(device);
  66         return cqr;
  67 }
  68
  69 void
  70 dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
  71 {
  72         unsigned long flags;
  73
  74         spin_lock_irqsave(&device->mem_lock, flags);
  75         dasd_free_chunk(&device->erp_chunks, cqr);
  76         spin_unlock_irqrestore(&device->mem_lock, flags);
  77         atomic_dec(&device->ref_count);
  78 }
  79
  80
  81 /*
  82  * dasd_default_erp_action just retries the current cqr
  83  */
  84 struct dasd_ccw_req *
  85 dasd_default_erp_action(struct dasd_ccw_req * cqr)
  86 {
  87         struct dasd_device *device;
  88
  89         device = cqr->device;
  90
  91         /* just retry - there is nothing to save ... I got no sense data.... */
  92         if (cqr->retries > 0) {
  93                 DEV_MESSAGE (KERN_DEBUG, device,
  94                              "default ERP called (%i retries left)",
  95                              cqr->retries);
  96                 cqr->lpm    = LPM_ANYPATH;
  97                 cqr->status = DASD_CQR_QUEUED;
  98         } else {
  99                 DEV_MESSAGE (KERN_WARNING, device, "%s",
 100                              "default ERP called (NO retry left)");
 101                 cqr->status = DASD_CQR_FAILED;
 102                 cqr->stopclk = get_clock ();
 103         }
 104         return cqr;
 105 }                               /* end dasd_default_erp_action */
 106
 107 /*
 108  * DESCRIPTION
 109  *   Frees all ERPs of the current ERP Chain and set the status
 110  *   of the original CQR either to DASD_CQR_DONE if ERP was successful
 111  *   or to DASD_CQR_FAILED if ERP was NOT successful.
 112  *   NOTE: This function is only called if no discipline postaction
 113  *         is available
 114  *
 115  * PARAMETER
 116  *   erp                current erp_head
 117  *
 118  * RETURN VALUES
 119  *   cqr                pointer to the original CQR
 120  */
 121 struct dasd_ccw_req *
 122 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
 123 {
 124         struct dasd_device *device;
 125         int success;
 126
 127         BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 128
 129         device = cqr->device;
 130         success = cqr->status == DASD_CQR_DONE;
 131
 132         /* free all ERPs - but NOT the original cqr */
 133         while (cqr->refers != NULL) {
 134                 struct dasd_ccw_req *refers;
 135
 136                 refers = cqr->refers;
 137                 /* remove the request from the device queue */
 138                 list_del(&cqr->list);
 139                 /* free the finished erp request */
 140                 dasd_free_erp_request(cqr, device);
 141                 cqr = refers;
 142         }
 143
 144         /* set corresponding status to original cqr */
 145         if (success)
 146                 cqr->status = DASD_CQR_DONE;
 147         else {
 148                 cqr->status = DASD_CQR_FAILED;
 149                 cqr->stopclk = get_clock();
 150         }
 151
 152         return cqr;
 153
 154 }                               /* end default_erp_postaction */
 155
 156 /*
 157  * Print the hex dump of the memory used by a request. This includes
 158  * all error recovery ccws that have been chained in from of the
 159  * real request.
 160  */
 161 static inline void
 162 hex_dump_memory(struct dasd_device *device, void *data, int len)
 163 {
 164         int *pint;
 165
 166         pint = (int *) data;
 167         while (len > 0) {
 168                 DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
 169                             pint, pint[0], pint[1], pint[2], pint[3]);
 170                 pint += 4;
 171                 len -= 16;
 172         }
 173 }
 174
 175 void
 176 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 177 {
 178         struct dasd_device *device;
 179
 180         device = cqr->device;
 181         /* dump sense data */
 182         if (device->discipline && device->discipline->dump_sense)
 183                 device->discipline->dump_sense(device, cqr, irb);
 184 }
 185
 186 void
 187 dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
 188 {
 189         struct dasd_device *device;
 190         struct dasd_ccw_req *lcqr;
 191         struct ccw1 *ccw;
 192         int cplength;
 193
 194         device = cqr->device;
 195         /* log the channel program */
 196         for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
 197                 DEV_MESSAGE(KERN_ERR, device,
 198                             "(%s) ERP chain report for req: %p",
 199                             caller == 0 ? "EXAMINE" : "ACTION", lcqr);
 200                 hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
 201
 202                 cplength = 1;
 203                 ccw = lcqr->cpaddr;
 204                 while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
 205                         cplength++;
 206
 207                 if (cplength > 40) {    /* log only parts of the CP */
 208                         DEV_MESSAGE(KERN_ERR, device, "%s",
 209                                     "Start of channel program:");
 210                         hex_dump_memory(device, lcqr->cpaddr,
 211                                         40*sizeof(struct ccw1));
 212
 213                         DEV_MESSAGE(KERN_ERR, device, "%s",
 214                                     "End of channel program:");
 215                         hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
 216                                         10*sizeof(struct ccw1));
 217                 } else {        /* log the whole CP */
 218                         DEV_MESSAGE(KERN_ERR, device, "%s",
 219                                     "Channel program (complete):");
 220                         hex_dump_memory(device, lcqr->cpaddr,
 221                                         cplength*sizeof(struct ccw1));
 222                 }
 223
 224                 if (lcqr != cqr)
 225                         continue;
 226
 227                 /*
 228                  * Log bytes arround failed CCW but only if we did
 229                  * not log the whole CP of the CCW is outside the
 230                  * logged CP.
 231                  */
 232                 if (cplength > 40 ||
 233                     ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
 234                      (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
 235
 236                         DEV_MESSAGE(KERN_ERR, device,
 237                                     "Failed CCW (%p) (area):",
 238                                     (void *) (long) cpa);
 239                         hex_dump_memory(device, cqr->cpaddr - 10,
 240                                         20*sizeof(struct ccw1));
 241                 }
 242         }
 243
 244 }                               /* end log_erp_chain */
 245
 246 EXPORT_SYMBOL(dasd_default_erp_action);
 247 EXPORT_SYMBOL(dasd_default_erp_postaction);
 248 EXPORT_SYMBOL(dasd_alloc_erp_request);
 249 EXPORT_SYMBOL(dasd_free_erp_request);
 250 EXPORT_SYMBOL(dasd_log_sense);
 251 EXPORT_SYMBOL(dasd_log_ccw);