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