drivers/s390/cio/device_status.c

   1 /*
   2  * drivers/s390/cio/device_status.c
   3  *
   4  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   5  *                       IBM Corporation
   6  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *
   9  * Status accumulation and basic sense functions.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/ccwdev.h>
  16 #include <asm/cio.h>
  17
  18 #include "cio.h"
  19 #include "cio_debug.h"
  20 #include "css.h"
  21 #include "device.h"
  22 #include "ioasm.h"
  23 #include "io_sch.h"
  24
  25 /*
  26  * Check for any kind of channel or interface control check but don't
  27  * issue the message for the console device
  28  */
  29 static void
  30 ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
  31 {
  32         if (!(irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK |
  33                                  SCHN_STAT_CHN_CTRL_CHK |
  34                                  SCHN_STAT_INTF_CTRL_CHK)))
  35                 return;
  36         CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
  37                       "received"
  38                       " ... device %04x on subchannel 0.%x.%04x, dev_stat "
  39                       ": %02X sch_stat : %02X\n",
  40                       cdev->private->dev_id.devno, cdev->private->schid.ssid,
  41                       cdev->private->schid.sch_no,
  42                       irb->scsw.dstat, irb->scsw.cstat);
  43
  44         if (irb->scsw.cc != 3) {
  45                 char dbf_text[15];
  46
  47                 sprintf(dbf_text, "chk%x", cdev->private->schid.sch_no);
  48                 CIO_TRACE_EVENT(0, dbf_text);
  49                 CIO_HEX_EVENT(0, irb, sizeof (struct irb));
  50         }
  51 }
  52
  53 /*
  54  * Some paths became not operational (pno bit in scsw is set).
  55  */
  56 static void
  57 ccw_device_path_notoper(struct ccw_device *cdev)
  58 {
  59         struct subchannel *sch;
  60
  61         sch = to_subchannel(cdev->dev.parent);
  62         stsch (sch->schid, &sch->schib);
  63
  64         CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
  65                       "not operational \n", __FUNCTION__,
  66                       sch->schid.ssid, sch->schid.sch_no,
  67                       sch->schib.pmcw.pnom);
  68
  69         sch->lpm &= ~sch->schib.pmcw.pnom;
  70         cdev->private->flags.doverify = 1;
  71 }
  72
  73 /*
  74  * Copy valid bits from the extended control word to device irb.
  75  */
  76 static void
  77 ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
  78 {
  79         /*
  80          * Copy extended control bit if it is valid... yes there
  81          * are condition that have to be met for the extended control
  82          * bit to have meaning. Sick.
  83          */
  84         cdev->private->irb.scsw.ectl = 0;
  85         if ((irb->scsw.stctl & SCSW_STCTL_ALERT_STATUS) &&
  86             !(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS))
  87                 cdev->private->irb.scsw.ectl = irb->scsw.ectl;
  88         /* Check if extended control word is valid. */
  89         if (!cdev->private->irb.scsw.ectl)
  90                 return;
  91         /* Copy concurrent sense / model dependent information. */
  92         memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
  93 }
  94
  95 /*
  96  * Check if extended status word is valid.
  97  */
  98 static int
  99 ccw_device_accumulate_esw_valid(struct irb *irb)
 100 {
 101         if (!irb->scsw.eswf && irb->scsw.stctl == SCSW_STCTL_STATUS_PEND)
 102                 return 0;
 103         if (irb->scsw.stctl ==
 104                         (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) &&
 105             !(irb->scsw.actl & SCSW_ACTL_SUSPENDED))
 106                 return 0;
 107         return 1;
 108 }
 109
 110 /*
 111  * Copy valid bits from the extended status word to device irb.
 112  */
 113 static void
 114 ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
 115 {
 116         struct irb *cdev_irb;
 117         struct sublog *cdev_sublog, *sublog;
 118
 119         if (!ccw_device_accumulate_esw_valid(irb))
 120                 return;
 121
 122         cdev_irb = &cdev->private->irb;
 123
 124         /* Copy last path used mask. */
 125         cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
 126
 127         /* Copy subchannel logout information if esw is of format 0. */
 128         if (irb->scsw.eswf) {
 129                 cdev_sublog = &cdev_irb->esw.esw0.sublog;
 130                 sublog = &irb->esw.esw0.sublog;
 131                 /* Copy extended status flags. */
 132                 cdev_sublog->esf = sublog->esf;
 133                 /*
 134                  * Copy fields that have a meaning for channel data check
 135                  * channel control check and interface control check.
 136                  */
 137                 if (irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK |
 138                                        SCHN_STAT_CHN_CTRL_CHK |
 139                                        SCHN_STAT_INTF_CTRL_CHK)) {
 140                         /* Copy ancillary report bit. */
 141                         cdev_sublog->arep = sublog->arep;
 142                         /* Copy field-validity-flags. */
 143                         cdev_sublog->fvf = sublog->fvf;
 144                         /* Copy storage access code. */
 145                         cdev_sublog->sacc = sublog->sacc;
 146                         /* Copy termination code. */
 147                         cdev_sublog->termc = sublog->termc;
 148                         /* Copy sequence code. */
 149                         cdev_sublog->seqc = sublog->seqc;
 150                 }
 151                 /* Copy device status check. */
 152                 cdev_sublog->devsc = sublog->devsc;
 153                 /* Copy secondary error. */
 154                 cdev_sublog->serr = sublog->serr;
 155                 /* Copy i/o-error alert. */
 156                 cdev_sublog->ioerr = sublog->ioerr;
 157                 /* Copy channel path timeout bit. */
 158                 if (irb->scsw.cstat & SCHN_STAT_INTF_CTRL_CHK)
 159                         cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
 160                 /* Copy failing storage address validity flag. */
 161                 cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
 162                 if (cdev_irb->esw.esw0.erw.fsavf) {
 163                         /* ... and copy the failing storage address. */
 164                         memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
 165                                sizeof (irb->esw.esw0.faddr));
 166                         /* ... and copy the failing storage address format. */
 167                         cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
 168                 }
 169                 /* Copy secondary ccw address validity bit. */
 170                 cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
 171                 if (irb->esw.esw0.erw.scavf)
 172                         /* ... and copy the secondary ccw address. */
 173                         cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
 174
 175         }
 176         /* FIXME: DCTI for format 2? */
 177
 178         /* Copy authorization bit. */
 179         cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
 180         /* Copy path verification required flag. */
 181         cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
 182         if (irb->esw.esw0.erw.pvrf)
 183                 cdev->private->flags.doverify = 1;
 184         /* Copy concurrent sense bit. */
 185         cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
 186         if (irb->esw.esw0.erw.cons)
 187                 cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
 188 }
 189
 190 /*
 191  * Accumulate status from irb to devstat.
 192  */
 193 void
 194 ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
 195 {
 196         struct irb *cdev_irb;
 197
 198         /*
 199          * Check if the status pending bit is set in stctl.
 200          * If not, the remaining bit have no meaning and we must ignore them.
 201          * The esw is not meaningful as well...
 202          */
 203         if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
 204                 return;
 205
 206         /* Check for channel checks and interface control checks. */
 207         ccw_device_msg_control_check(cdev, irb);
 208
 209         /* Check for path not operational. */
 210         if (irb->scsw.pno && irb->scsw.fctl != 0 &&
 211             (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) ||
 212              (irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
 213                 ccw_device_path_notoper(cdev);
 214
 215         /*
 216          * Don't accumulate unsolicited interrupts.
 217          */
 218         if ((irb->scsw.stctl ==
 219              (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
 220             (!irb->scsw.cc))
 221                 return;
 222
 223         cdev_irb = &cdev->private->irb;
 224
 225         /*
 226          * If the clear function had been performed, all formerly pending
 227          * status at the subchannel has been cleared and we must not pass
 228          * intermediate accumulated status to the device driver.
 229          */
 230         if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC)
 231                 memset(&cdev->private->irb, 0, sizeof(struct irb));
 232
 233         /* Copy bits which are valid only for the start function. */
 234         if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) {
 235                 /* Copy key. */
 236                 cdev_irb->scsw.key = irb->scsw.key;
 237                 /* Copy suspend control bit. */
 238                 cdev_irb->scsw.sctl = irb->scsw.sctl;
 239                 /* Accumulate deferred condition code. */
 240                 cdev_irb->scsw.cc |= irb->scsw.cc;
 241                 /* Copy ccw format bit. */
 242                 cdev_irb->scsw.fmt = irb->scsw.fmt;
 243                 /* Copy prefetch bit. */
 244                 cdev_irb->scsw.pfch = irb->scsw.pfch;
 245                 /* Copy initial-status-interruption-control. */
 246                 cdev_irb->scsw.isic = irb->scsw.isic;
 247                 /* Copy address limit checking control. */
 248                 cdev_irb->scsw.alcc = irb->scsw.alcc;
 249                 /* Copy suppress suspend bit. */
 250                 cdev_irb->scsw.ssi = irb->scsw.ssi;
 251         }
 252
 253         /* Take care of the extended control bit and extended control word. */
 254         ccw_device_accumulate_ecw(cdev, irb);
 255
 256         /* Accumulate function control. */
 257         cdev_irb->scsw.fctl |= irb->scsw.fctl;
 258         /* Copy activity control. */
 259         cdev_irb->scsw.actl= irb->scsw.actl;
 260         /* Accumulate status control. */
 261         cdev_irb->scsw.stctl |= irb->scsw.stctl;
 262         /*
 263          * Copy ccw address if it is valid. This is a bit simplified
 264          * but should be close enough for all practical purposes.
 265          */
 266         if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) ||
 267             ((irb->scsw.stctl ==
 268               (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
 269              (irb->scsw.actl & SCSW_ACTL_DEVACT) &&
 270              (irb->scsw.actl & SCSW_ACTL_SCHACT)) ||
 271             (irb->scsw.actl & SCSW_ACTL_SUSPENDED))
 272                 cdev_irb->scsw.cpa = irb->scsw.cpa;
 273         /* Accumulate device status, but not the device busy flag. */
 274         cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY;
 275         /* dstat is not always valid. */
 276         if (irb->scsw.stctl &
 277             (SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
 278              | SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
 279                 cdev_irb->scsw.dstat |= irb->scsw.dstat;
 280         /* Accumulate subchannel status. */
 281         cdev_irb->scsw.cstat |= irb->scsw.cstat;
 282         /* Copy residual count if it is valid. */
 283         if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
 284             (irb->scsw.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN)) == 0)
 285                 cdev_irb->scsw.count = irb->scsw.count;
 286
 287         /* Take care of bits in the extended status word. */
 288         ccw_device_accumulate_esw(cdev, irb);
 289
 290         /*
 291          * Check whether we must issue a SENSE CCW ourselves if there is no
 292          * concurrent sense facility installed for the subchannel.
 293          * No sense is required if no delayed sense is pending
 294          * and we did not get a unit check without sense information.
 295          *
 296          * Note: We should check for ioinfo[irq]->flags.consns but VM
 297          *       violates the ESA/390 architecture and doesn't present an
 298          *       operand exception for virtual devices without concurrent
 299          *       sense facility available/supported when enabling the
 300          *       concurrent sense facility.
 301          */
 302         if ((cdev_irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 303             !(cdev_irb->esw.esw0.erw.cons))
 304                 cdev->private->flags.dosense = 1;
 305 }
 306
 307 /*
 308  * Do a basic sense.
 309  */
 310 int
 311 ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
 312 {
 313         struct subchannel *sch;
 314         struct ccw1 *sense_ccw;
 315
 316         sch = to_subchannel(cdev->dev.parent);
 317
 318         /* A sense is required, can we do it now ? */
 319         if ((irb->scsw.actl  & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
 320                 /*
 321                  * we received an Unit Check but we have no final
 322                  *  status yet, therefore we must delay the SENSE
 323                  *  processing. We must not report this intermediate
 324                  *  status to the device interrupt handler.
 325                  */
 326                 return -EBUSY;
 327
 328         /*
 329          * We have ending status but no sense information. Do a basic sense.
 330          */
 331         sense_ccw = &to_io_private(sch)->sense_ccw;
 332         sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
 333         sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
 334         sense_ccw->count = SENSE_MAX_COUNT;
 335         sense_ccw->flags = CCW_FLAG_SLI;
 336
 337         /* Reset internal retry indication. */
 338         cdev->private->flags.intretry = 0;
 339
 340         return cio_start(sch, sense_ccw, 0xff);
 341 }
 342
 343 /*
 344  * Add information from basic sense to devstat.
 345  */
 346 void
 347 ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
 348 {
 349         /*
 350          * Check if the status pending bit is set in stctl.
 351          * If not, the remaining bit have no meaning and we must ignore them.
 352          * The esw is not meaningful as well...
 353          */
 354         if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
 355                 return;
 356
 357         /* Check for channel checks and interface control checks. */
 358         ccw_device_msg_control_check(cdev, irb);
 359
 360         /* Check for path not operational. */
 361         if (irb->scsw.pno && irb->scsw.fctl != 0 &&
 362             (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) ||
 363              (irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
 364                 ccw_device_path_notoper(cdev);
 365
 366         if (!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 367             (irb->scsw.dstat & DEV_STAT_CHN_END)) {
 368                 cdev->private->irb.esw.esw0.erw.cons = 1;
 369                 cdev->private->flags.dosense = 0;
 370         }
 371         /* Check if path verification is required. */
 372         if (ccw_device_accumulate_esw_valid(irb) &&
 373             irb->esw.esw0.erw.pvrf)
 374                 cdev->private->flags.doverify = 1;
 375 }
 376
 377 /*
 378  * This function accumulates the status into the private devstat and
 379  * starts a basic sense if one is needed.
 380  */
 381 int
 382 ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
 383 {
 384         ccw_device_accumulate_irb(cdev, irb);
 385         if ((irb->scsw.actl  & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
 386                 return -EBUSY;
 387         /* Check for basic sense. */
 388         if (cdev->private->flags.dosense &&
 389             !(irb->scsw.dstat & DEV_STAT_UNIT_CHECK)) {
 390                 cdev->private->irb.esw.esw0.erw.cons = 1;
 391                 cdev->private->flags.dosense = 0;
 392                 return 0;
 393         }
 394         if (cdev->private->flags.dosense) {
 395                 ccw_device_do_sense(cdev, irb);
 396                 return -EBUSY;
 397         }
 398         return 0;
 399 }
 400