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  * $Revision: 1.14 $
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/ctype.h>
  15 #include <linux/init.h>
  16
  17 #include <asm/debug.h>
  18 #include <asm/ebcdic.h>
  19 #include <asm/uaccess.h>
  20
  21 /* This is ugly... */
  22 #define PRINTK_HEADER "dasd_erp:"
  23
  24 #include "dasd_int.h"
  25
  26 struct dasd_ccw_req *
  27 dasd_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         if ( magic == NULL || datasize > PAGE_SIZE ||
  37              (cplength*sizeof(struct ccw1)) > PAGE_SIZE)
  38                 BUG();
  39
  40         size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
  41         if (cplength > 0)
  42                 size += cplength * sizeof(struct ccw1);
  43         if (datasize > 0)
  44                 size += datasize;
  45         spin_lock_irqsave(&device->mem_lock, flags);
  46         cqr = (struct dasd_ccw_req *)
  47                 dasd_alloc_chunk(&device->erp_chunks, size);
  48         spin_unlock_irqrestore(&device->mem_lock, flags);
  49         if (cqr == NULL)
  50                 return ERR_PTR(-ENOMEM);
  51         memset(cqr, 0, sizeof(struct dasd_ccw_req));
  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->device;
  92
  93         /* just retry - there is nothing to save ... I got no sense data.... */
  94         if (cqr->retries > 0) {
  95                 DEV_MESSAGE (KERN_DEBUG, device,
  96                              "default ERP called (%i retries left)",
  97                              cqr->retries);
  98                 cqr->lpm    = LPM_ANYPATH;
  99                 cqr->status = DASD_CQR_QUEUED;
 100         } else {
 101                 DEV_MESSAGE (KERN_WARNING, device, "%s",
 102                              "default ERP called (NO retry left)");
 103                 cqr->status = DASD_CQR_FAILED;
 104                 cqr->stopclk = get_clock ();
 105         }
 106         return cqr;
 107 }                               /* end dasd_default_erp_action */
 108
 109 /*
 110  * DESCRIPTION
 111  *   Frees all ERPs of the current ERP Chain and set the status
 112  *   of the original CQR either to DASD_CQR_DONE if ERP was successful
 113  *   or to DASD_CQR_FAILED if ERP was NOT successful.
 114  *   NOTE: This function is only called if no discipline postaction
 115  *         is available
 116  *
 117  * PARAMETER
 118  *   erp                current erp_head
 119  *
 120  * RETURN VALUES
 121  *   cqr                pointer to the original CQR
 122  */
 123 struct dasd_ccw_req *
 124 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
 125 {
 126         struct dasd_device *device;
 127         int success;
 128
 129         if (cqr->refers == NULL || cqr->function == NULL)
 130                 BUG();
 131
 132         device = cqr->device;
 133         success = cqr->status == DASD_CQR_DONE;
 134
 135         /* free all ERPs - but NOT the original cqr */
 136         while (cqr->refers != NULL) {
 137                 struct dasd_ccw_req *refers;
 138
 139                 refers = cqr->refers;
 140                 /* remove the request from the device queue */
 141                 list_del(&cqr->list);
 142                 /* free the finished erp request */
 143                 dasd_free_erp_request(cqr, device);
 144                 cqr = refers;
 145         }
 146
 147         /* set corresponding status to original cqr */
 148         if (success)
 149                 cqr->status = DASD_CQR_DONE;
 150         else {
 151                 cqr->status = DASD_CQR_FAILED;
 152                 cqr->stopclk = get_clock();
 153         }
 154
 155         return cqr;
 156
 157 }                               /* end default_erp_postaction */
 158
 159 /*
 160  * Print the hex dump of the memory used by a request. This includes
 161  * all error recovery ccws that have been chained in from of the
 162  * real request.
 163  */
 164 static inline void
 165 hex_dump_memory(struct dasd_device *device, void *data, int len)
 166 {
 167         int *pint;
 168
 169         pint = (int *) data;
 170         while (len > 0) {
 171                 DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
 172                             pint, pint[0], pint[1], pint[2], pint[3]);
 173                 pint += 4;
 174                 len -= 16;
 175         }
 176 }
 177
 178 void
 179 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 180 {
 181         struct dasd_device *device;
 182
 183         device = cqr->device;
 184         /* dump sense data */
 185         if (device->discipline && device->discipline->dump_sense)
 186                 device->discipline->dump_sense(device, cqr, irb);
 187 }
 188
 189 void
 190 dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
 191 {
 192         struct dasd_device *device;
 193         struct dasd_ccw_req *lcqr;
 194         struct ccw1 *ccw;
 195         int cplength;
 196
 197         device = cqr->device;
 198         /* log the channel program */
 199         for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
 200                 DEV_MESSAGE(KERN_ERR, device,
 201                             "(%s) ERP chain report for req: %p",
 202                             caller == 0 ? "EXAMINE" : "ACTION", lcqr);
 203                 hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
 204
 205                 cplength = 1;
 206                 ccw = lcqr->cpaddr;
 207                 while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
 208                         cplength++;
 209
 210                 if (cplength > 40) {    /* log only parts of the CP */
 211                         DEV_MESSAGE(KERN_ERR, device, "%s",
 212                                     "Start of channel program:");
 213                         hex_dump_memory(device, lcqr->cpaddr,
 214                                         40*sizeof(struct ccw1));
 215
 216                         DEV_MESSAGE(KERN_ERR, device, "%s",
 217                                     "End of channel program:");
 218                         hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
 219                                         10*sizeof(struct ccw1));
 220                 } else {        /* log the whole CP */
 221                         DEV_MESSAGE(KERN_ERR, device, "%s",
 222                                     "Channel program (complete):");
 223                         hex_dump_memory(device, lcqr->cpaddr,
 224                                         cplength*sizeof(struct ccw1));
 225                 }
 226
 227                 if (lcqr != cqr)
 228                         continue;
 229
 230                 /*
 231                  * Log bytes arround failed CCW but only if we did
 232                  * not log the whole CP of the CCW is outside the
 233                  * logged CP.
 234                  */
 235                 if (cplength > 40 ||
 236                     ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
 237                      (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
 238
 239                         DEV_MESSAGE(KERN_ERR, device,
 240                                     "Failed CCW (%p) (area):",
 241                                     (void *) (long) cpa);
 242                         hex_dump_memory(device, cqr->cpaddr - 10,
 243                                         20*sizeof(struct ccw1));
 244                 }
 245         }
 246
 247 }                               /* end log_erp_chain */
 248
 249 EXPORT_SYMBOL(dasd_default_erp_action);
 250 EXPORT_SYMBOL(dasd_default_erp_postaction);
 251 EXPORT_SYMBOL(dasd_alloc_erp_request);
 252 EXPORT_SYMBOL(dasd_free_erp_request);
 253 EXPORT_SYMBOL(dasd_log_sense);
 254 EXPORT_SYMBOL(dasd_log_ccw);