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/ctype.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/debug.h>
  16 #include <asm/ebcdic.h>
  17 #include <asm/uaccess.h>
  18
  19 /* This is ugly... */
  20 #define PRINTK_HEADER "dasd_erp:"
  21
  22 #include "dasd_int.h"
  23
  24 struct dasd_ccw_req *
  25 dasd_alloc_erp_request(char *magic, int cplength, int datasize,
  26                        struct dasd_device * device)
  27 {
  28         unsigned long flags;
  29         struct dasd_ccw_req *cqr;
  30         char *data;
  31         int size;
  32
  33         /* Sanity checks */
  34         BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
  35              (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
  36
  37         size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
  38         if (cplength > 0)
  39                 size += cplength * sizeof(struct ccw1);
  40         if (datasize > 0)
  41                 size += datasize;
  42         spin_lock_irqsave(&device->mem_lock, flags);
  43         cqr = (struct dasd_ccw_req *)
  44                 dasd_alloc_chunk(&device->erp_chunks, size);
  45         spin_unlock_irqrestore(&device->mem_lock, flags);
  46         if (cqr == NULL)
  47                 return ERR_PTR(-ENOMEM);
  48         memset(cqr, 0, sizeof(struct dasd_ccw_req));
  49         data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
  50         cqr->cpaddr = NULL;
  51         if (cplength > 0) {
  52                 cqr->cpaddr = (struct ccw1 *) data;
  53                 data += cplength*sizeof(struct ccw1);
  54                 memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
  55         }
  56         cqr->data = NULL;
  57         if (datasize > 0) {
  58                 cqr->data = data;
  59                 memset(cqr->data, 0, datasize);
  60         }
  61         strncpy((char *) &cqr->magic, magic, 4);
  62         ASCEBC((char *) &cqr->magic, 4);
  63         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
  64         dasd_get_device(device);
  65         return cqr;
  66 }
  67
  68 void
  69 dasd_free_erp_request(struct dasd_ccw_req * cqr, struct dasd_device * device)
  70 {
  71         unsigned long flags;
  72
  73         spin_lock_irqsave(&device->mem_lock, flags);
  74         dasd_free_chunk(&device->erp_chunks, cqr);
  75         spin_unlock_irqrestore(&device->mem_lock, flags);
  76         atomic_dec(&device->ref_count);
  77 }
  78
  79
  80 /*
  81  * dasd_default_erp_action just retries the current cqr
  82  */
  83 struct dasd_ccw_req *
  84 dasd_default_erp_action(struct dasd_ccw_req * cqr)
  85 {
  86         struct dasd_device *device;
  87
  88         device = cqr->device;
  89
  90         /* just retry - there is nothing to save ... I got no sense data.... */
  91         if (cqr->retries > 0) {
  92                 DEV_MESSAGE (KERN_DEBUG, device,
  93                              "default ERP called (%i retries left)",
  94                              cqr->retries);
  95                 cqr->lpm    = LPM_ANYPATH;
  96                 cqr->status = DASD_CQR_QUEUED;
  97         } else {
  98                 DEV_MESSAGE (KERN_WARNING, device, "%s",
  99                              "default ERP called (NO retry left)");
 100                 cqr->status = DASD_CQR_FAILED;
 101                 cqr->stopclk = get_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 *
 121 dasd_default_erp_postaction(struct dasd_ccw_req * cqr)
 122 {
 123         struct dasd_device *device;
 124         int success;
 125
 126         BUG_ON(cqr->refers == NULL || cqr->function == NULL);
 127
 128         device = cqr->device;
 129         success = cqr->status == DASD_CQR_DONE;
 130
 131         /* free all ERPs - but NOT the original cqr */
 132         while (cqr->refers != NULL) {
 133                 struct dasd_ccw_req *refers;
 134
 135                 refers = cqr->refers;
 136                 /* remove the request from the device queue */
 137                 list_del(&cqr->list);
 138                 /* free the finished erp request */
 139                 dasd_free_erp_request(cqr, device);
 140                 cqr = refers;
 141         }
 142
 143         /* set corresponding status to original cqr */
 144         if (success)
 145                 cqr->status = DASD_CQR_DONE;
 146         else {
 147                 cqr->status = DASD_CQR_FAILED;
 148                 cqr->stopclk = get_clock();
 149         }
 150
 151         return cqr;
 152
 153 }                               /* end default_erp_postaction */
 154
 155 /*
 156  * Print the hex dump of the memory used by a request. This includes
 157  * all error recovery ccws that have been chained in from of the
 158  * real request.
 159  */
 160 static inline void
 161 hex_dump_memory(struct dasd_device *device, void *data, int len)
 162 {
 163         int *pint;
 164
 165         pint = (int *) data;
 166         while (len > 0) {
 167                 DEV_MESSAGE(KERN_ERR, device, "%p: %08x %08x %08x %08x",
 168                             pint, pint[0], pint[1], pint[2], pint[3]);
 169                 pint += 4;
 170                 len -= 16;
 171         }
 172 }
 173
 174 void
 175 dasd_log_sense(struct dasd_ccw_req *cqr, struct irb *irb)
 176 {
 177         struct dasd_device *device;
 178
 179         device = cqr->device;
 180         /* dump sense data */
 181         if (device->discipline && device->discipline->dump_sense)
 182                 device->discipline->dump_sense(device, cqr, irb);
 183 }
 184
 185 void
 186 dasd_log_ccw(struct dasd_ccw_req * cqr, int caller, __u32 cpa)
 187 {
 188         struct dasd_device *device;
 189         struct dasd_ccw_req *lcqr;
 190         struct ccw1 *ccw;
 191         int cplength;
 192
 193         device = cqr->device;
 194         /* log the channel program */
 195         for (lcqr = cqr; lcqr != NULL; lcqr = lcqr->refers) {
 196                 DEV_MESSAGE(KERN_ERR, device,
 197                             "(%s) ERP chain report for req: %p",
 198                             caller == 0 ? "EXAMINE" : "ACTION", lcqr);
 199                 hex_dump_memory(device, lcqr, sizeof(struct dasd_ccw_req));
 200
 201                 cplength = 1;
 202                 ccw = lcqr->cpaddr;
 203                 while (ccw++->flags & (CCW_FLAG_DC | CCW_FLAG_CC))
 204                         cplength++;
 205
 206                 if (cplength > 40) {    /* log only parts of the CP */
 207                         DEV_MESSAGE(KERN_ERR, device, "%s",
 208                                     "Start of channel program:");
 209                         hex_dump_memory(device, lcqr->cpaddr,
 210                                         40*sizeof(struct ccw1));
 211
 212                         DEV_MESSAGE(KERN_ERR, device, "%s",
 213                                     "End of channel program:");
 214                         hex_dump_memory(device, lcqr->cpaddr + cplength - 10,
 215                                         10*sizeof(struct ccw1));
 216                 } else {        /* log the whole CP */
 217                         DEV_MESSAGE(KERN_ERR, device, "%s",
 218                                     "Channel program (complete):");
 219                         hex_dump_memory(device, lcqr->cpaddr,
 220                                         cplength*sizeof(struct ccw1));
 221                 }
 222
 223                 if (lcqr != cqr)
 224                         continue;
 225
 226                 /*
 227                  * Log bytes arround failed CCW but only if we did
 228                  * not log the whole CP of the CCW is outside the
 229                  * logged CP.
 230                  */
 231                 if (cplength > 40 ||
 232                     ((addr_t) cpa < (addr_t) lcqr->cpaddr &&
 233                      (addr_t) cpa > (addr_t) (lcqr->cpaddr + cplength + 4))) {
 234
 235                         DEV_MESSAGE(KERN_ERR, device,
 236                                     "Failed CCW (%p) (area):",
 237                                     (void *) (long) cpa);
 238                         hex_dump_memory(device, cqr->cpaddr - 10,
 239                                         20*sizeof(struct ccw1));
 240                 }
 241         }
 242
 243 }                               /* end log_erp_chain */
 244
 245 EXPORT_SYMBOL(dasd_default_erp_action);
 246 EXPORT_SYMBOL(dasd_default_erp_postaction);
 247 EXPORT_SYMBOL(dasd_alloc_erp_request);
 248 EXPORT_SYMBOL(dasd_free_erp_request);
 249 EXPORT_SYMBOL(dasd_log_sense);
 250 EXPORT_SYMBOL(dasd_log_ccw);