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
  24 /*
  25  * Check for any kind of channel or interface control check but don't
  26  * issue the message for the console device
  27  */
  28 static inline void
  29 ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
  30 {
  31         if (!(irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK |
  32                                  SCHN_STAT_CHN_CTRL_CHK |
  33                                  SCHN_STAT_INTF_CTRL_CHK)))
  34                 return;
  35
  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->devno, cdev->private->ssid,
  41                       cdev->private->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->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 inline 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 inline 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 inline 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         /* Copy bits which are valid only for the start function. */
 226         if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) {
 227                 /* Copy key. */
 228                 cdev_irb->scsw.key = irb->scsw.key;
 229                 /* Copy suspend control bit. */
 230                 cdev_irb->scsw.sctl = irb->scsw.sctl;
 231                 /* Accumulate deferred condition code. */
 232                 cdev_irb->scsw.cc |= irb->scsw.cc;
 233                 /* Copy ccw format bit. */
 234                 cdev_irb->scsw.fmt = irb->scsw.fmt;
 235                 /* Copy prefetch bit. */
 236                 cdev_irb->scsw.pfch = irb->scsw.pfch;
 237                 /* Copy initial-status-interruption-control. */
 238                 cdev_irb->scsw.isic = irb->scsw.isic;
 239                 /* Copy address limit checking control. */
 240                 cdev_irb->scsw.alcc = irb->scsw.alcc;
 241                 /* Copy suppress suspend bit. */
 242                 cdev_irb->scsw.ssi = irb->scsw.ssi;
 243         }
 244
 245         /* Take care of the extended control bit and extended control word. */
 246         ccw_device_accumulate_ecw(cdev, irb);
 247
 248         /* Accumulate function control. */
 249         cdev_irb->scsw.fctl |= irb->scsw.fctl;
 250         /* Copy activity control. */
 251         cdev_irb->scsw.actl= irb->scsw.actl;
 252         /* Accumulate status control. */
 253         cdev_irb->scsw.stctl |= irb->scsw.stctl;
 254         /*
 255          * Copy ccw address if it is valid. This is a bit simplified
 256          * but should be close enough for all practical purposes.
 257          */
 258         if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) ||
 259             ((irb->scsw.stctl ==
 260               (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
 261              (irb->scsw.actl & SCSW_ACTL_DEVACT) &&
 262              (irb->scsw.actl & SCSW_ACTL_SCHACT)) ||
 263             (irb->scsw.actl & SCSW_ACTL_SUSPENDED))
 264                 cdev_irb->scsw.cpa = irb->scsw.cpa;
 265         /* Accumulate device status, but not the device busy flag. */
 266         cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY;
 267         cdev_irb->scsw.dstat |= irb->scsw.dstat;
 268         /* Accumulate subchannel status. */
 269         cdev_irb->scsw.cstat |= irb->scsw.cstat;
 270         /* Copy residual count if it is valid. */
 271         if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
 272             (irb->scsw.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN)) == 0)
 273                 cdev_irb->scsw.count = irb->scsw.count;
 274
 275         /* Take care of bits in the extended status word. */
 276         ccw_device_accumulate_esw(cdev, irb);
 277
 278         /*
 279          * Check whether we must issue a SENSE CCW ourselves if there is no
 280          * concurrent sense facility installed for the subchannel.
 281          * No sense is required if no delayed sense is pending
 282          * and we did not get a unit check without sense information.
 283          *
 284          * Note: We should check for ioinfo[irq]->flags.consns but VM
 285          *       violates the ESA/390 architecture and doesn't present an
 286          *       operand exception for virtual devices without concurrent
 287          *       sense facility available/supported when enabling the
 288          *       concurrent sense facility.
 289          */
 290         if ((cdev_irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 291             !(cdev_irb->esw.esw0.erw.cons))
 292                 cdev->private->flags.dosense = 1;
 293 }
 294
 295 /*
 296  * Do a basic sense.
 297  */
 298 int
 299 ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
 300 {
 301         struct subchannel *sch;
 302
 303         sch = to_subchannel(cdev->dev.parent);
 304
 305         /* A sense is required, can we do it now ? */
 306         if ((irb->scsw.actl  & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
 307                 /*
 308                  * we received an Unit Check but we have no final
 309                  *  status yet, therefore we must delay the SENSE
 310                  *  processing. We must not report this intermediate
 311                  *  status to the device interrupt handler.
 312                  */
 313                 return -EBUSY;
 314
 315         /*
 316          * We have ending status but no sense information. Do a basic sense.
 317          */
 318         sch->sense_ccw.cmd_code = CCW_CMD_BASIC_SENSE;
 319         sch->sense_ccw.cda = (__u32) __pa(cdev->private->irb.ecw);
 320         sch->sense_ccw.count = SENSE_MAX_COUNT;
 321         sch->sense_ccw.flags = CCW_FLAG_SLI;
 322
 323         return cio_start (sch, &sch->sense_ccw, 0xff);
 324 }
 325
 326 /*
 327  * Add information from basic sense to devstat.
 328  */
 329 void
 330 ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
 331 {
 332         /*
 333          * Check if the status pending bit is set in stctl.
 334          * If not, the remaining bit have no meaning and we must ignore them.
 335          * The esw is not meaningful as well...
 336          */
 337         if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
 338                 return;
 339
 340         /* Check for channel checks and interface control checks. */
 341         ccw_device_msg_control_check(cdev, irb);
 342
 343         /* Check for path not operational. */
 344         if (irb->scsw.pno && irb->scsw.fctl != 0 &&
 345             (!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) ||
 346              (irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
 347                 ccw_device_path_notoper(cdev);
 348
 349         if (!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 350             (irb->scsw.dstat & DEV_STAT_CHN_END)) {
 351                 cdev->private->irb.esw.esw0.erw.cons = 1;
 352                 cdev->private->flags.dosense = 0;
 353         }
 354         /* Check if path verification is required. */
 355         if (ccw_device_accumulate_esw_valid(irb) &&
 356             irb->esw.esw0.erw.pvrf)
 357                 cdev->private->flags.doverify = 1;
 358 }
 359
 360 /*
 361  * This function accumulates the status into the private devstat and
 362  * starts a basic sense if one is needed.
 363  */
 364 int
 365 ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
 366 {
 367         ccw_device_accumulate_irb(cdev, irb);
 368         if ((irb->scsw.actl  & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
 369                 return -EBUSY;
 370         /* Check for basic sense. */
 371         if (cdev->private->flags.dosense &&
 372             !(irb->scsw.dstat & DEV_STAT_UNIT_CHECK)) {
 373                 cdev->private->irb.esw.esw0.erw.cons = 1;
 374                 cdev->private->flags.dosense = 0;
 375                 return 0;
 376         }
 377         if (cdev->private->flags.dosense) {
 378                 ccw_device_do_sense(cdev, irb);
 379                 return -EBUSY;
 380         }
 381         return 0;
 382 }
 383