drivers/s390/cio/device_status.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *    Copyright IBM Corp. 2002
   4  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   5  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   6  *
   7  * Status accumulation and basic sense functions.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12
  13 #include <asm/ccwdev.h>
  14 #include <asm/cio.h>
  15
  16 #include "cio.h"
  17 #include "cio_debug.h"
  18 #include "css.h"
  19 #include "device.h"
  20 #include "ioasm.h"
  21 #include "io_sch.h"
  22
  23 /*
  24  * Check for any kind of channel or interface control check but don't
  25  * issue the message for the console device
  26  */
  27 static void
  28 ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
  29 {
  30         struct subchannel *sch = to_subchannel(cdev->dev.parent);
  31         char dbf_text[15];
  32
  33         if (!scsw_is_valid_cstat(&irb->scsw) ||
  34             !(scsw_cstat(&irb->scsw) & (SCHN_STAT_CHN_DATA_CHK |
  35               SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK)))
  36                 return;
  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->dev_id.devno, sch->schid.ssid,
  42                       sch->schid.sch_no,
  43                       scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
  44         sprintf(dbf_text, "chk%x", sch->schid.sch_no);
  45         CIO_TRACE_EVENT(0, dbf_text);
  46         CIO_HEX_EVENT(0, irb, sizeof(struct irb));
  47 }
  48
  49 /*
  50  * Some paths became not operational (pno bit in scsw is set).
  51  */
  52 static void
  53 ccw_device_path_notoper(struct ccw_device *cdev)
  54 {
  55         struct subchannel *sch;
  56
  57         sch = to_subchannel(cdev->dev.parent);
  58         if (cio_update_schib(sch))
  59                 goto doverify;
  60
  61         CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
  62                       "not operational \n", __func__,
  63                       sch->schid.ssid, sch->schid.sch_no,
  64                       sch->schib.pmcw.pnom);
  65
  66         sch->lpm &= ~sch->schib.pmcw.pnom;
  67 doverify:
  68         cdev->private->flags.doverify = 1;
  69 }
  70
  71 /*
  72  * Copy valid bits from the extended control word to device irb.
  73  */
  74 static void
  75 ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
  76 {
  77         /*
  78          * Copy extended control bit if it is valid... yes there
  79          * are condition that have to be met for the extended control
  80          * bit to have meaning. Sick.
  81          */
  82         cdev->private->dma_area->irb.scsw.cmd.ectl = 0;
  83         if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
  84             !(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
  85                 cdev->private->dma_area->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
  86         /* Check if extended control word is valid. */
  87         if (!cdev->private->dma_area->irb.scsw.cmd.ectl)
  88                 return;
  89         /* Copy concurrent sense / model dependent information. */
  90         memcpy(&cdev->private->dma_area->irb.ecw, irb->ecw, sizeof(irb->ecw));
  91 }
  92
  93 /*
  94  * Check if extended status word is valid.
  95  */
  96 static int
  97 ccw_device_accumulate_esw_valid(struct irb *irb)
  98 {
  99         if (!irb->scsw.cmd.eswf &&
 100             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND))
 101                 return 0;
 102         if (irb->scsw.cmd.stctl ==
 103                         (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) &&
 104             !(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
 105                 return 0;
 106         return 1;
 107 }
 108
 109 /*
 110  * Copy valid bits from the extended status word to device irb.
 111  */
 112 static void
 113 ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
 114 {
 115         struct irb *cdev_irb;
 116         struct sublog *cdev_sublog, *sublog;
 117
 118         if (!ccw_device_accumulate_esw_valid(irb))
 119                 return;
 120
 121         cdev_irb = &cdev->private->dma_area->irb;
 122
 123         /* Copy last path used mask. */
 124         cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
 125
 126         /* Copy subchannel logout information if esw is of format 0. */
 127         if (irb->scsw.cmd.eswf) {
 128                 cdev_sublog = &cdev_irb->esw.esw0.sublog;
 129                 sublog = &irb->esw.esw0.sublog;
 130                 /* Copy extended status flags. */
 131                 cdev_sublog->esf = sublog->esf;
 132                 /*
 133                  * Copy fields that have a meaning for channel data check
 134                  * channel control check and interface control check.
 135                  */
 136                 if (irb->scsw.cmd.cstat & (SCHN_STAT_CHN_DATA_CHK |
 137                                        SCHN_STAT_CHN_CTRL_CHK |
 138                                        SCHN_STAT_INTF_CTRL_CHK)) {
 139                         /* Copy ancillary report bit. */
 140                         cdev_sublog->arep = sublog->arep;
 141                         /* Copy field-validity-flags. */
 142                         cdev_sublog->fvf = sublog->fvf;
 143                         /* Copy storage access code. */
 144                         cdev_sublog->sacc = sublog->sacc;
 145                         /* Copy termination code. */
 146                         cdev_sublog->termc = sublog->termc;
 147                         /* Copy sequence code. */
 148                         cdev_sublog->seqc = sublog->seqc;
 149                 }
 150                 /* Copy device status check. */
 151                 cdev_sublog->devsc = sublog->devsc;
 152                 /* Copy secondary error. */
 153                 cdev_sublog->serr = sublog->serr;
 154                 /* Copy i/o-error alert. */
 155                 cdev_sublog->ioerr = sublog->ioerr;
 156                 /* Copy channel path timeout bit. */
 157                 if (irb->scsw.cmd.cstat & SCHN_STAT_INTF_CTRL_CHK)
 158                         cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
 159                 /* Copy failing storage address validity flag. */
 160                 cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
 161                 if (cdev_irb->esw.esw0.erw.fsavf) {
 162                         /* ... and copy the failing storage address. */
 163                         memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
 164                                sizeof (irb->esw.esw0.faddr));
 165                         /* ... and copy the failing storage address format. */
 166                         cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
 167                 }
 168                 /* Copy secondary ccw address validity bit. */
 169                 cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
 170                 if (irb->esw.esw0.erw.scavf)
 171                         /* ... and copy the secondary ccw address. */
 172                         cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
 173
 174         }
 175         /* FIXME: DCTI for format 2? */
 176
 177         /* Copy authorization bit. */
 178         cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
 179         /* Copy path verification required flag. */
 180         cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
 181         if (irb->esw.esw0.erw.pvrf)
 182                 cdev->private->flags.doverify = 1;
 183         /* Copy concurrent sense bit. */
 184         cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
 185         if (irb->esw.esw0.erw.cons)
 186                 cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
 187 }
 188
 189 /*
 190  * Accumulate status from irb to devstat.
 191  */
 192 void
 193 ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
 194 {
 195         struct irb *cdev_irb;
 196
 197         /*
 198          * Check if the status pending bit is set in stctl.
 199          * If not, the remaining bit have no meaning and we must ignore them.
 200          * The esw is not meaningful as well...
 201          */
 202         if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
 203                 return;
 204
 205         /* Check for channel checks and interface control checks. */
 206         ccw_device_msg_control_check(cdev, irb);
 207
 208         /* Check for path not operational. */
 209         if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
 210                 ccw_device_path_notoper(cdev);
 211         /* No irb accumulation for transport mode irbs. */
 212         if (scsw_is_tm(&irb->scsw)) {
 213                 memcpy(&cdev->private->dma_area->irb, irb, sizeof(struct irb));
 214                 return;
 215         }
 216         /*
 217          * Don't accumulate unsolicited interrupts.
 218          */
 219         if (!scsw_is_solicited(&irb->scsw))
 220                 return;
 221
 222         cdev_irb = &cdev->private->dma_area->irb;
 223
 224         /*
 225          * If the clear function had been performed, all formerly pending
 226          * status at the subchannel has been cleared and we must not pass
 227          * intermediate accumulated status to the device driver.
 228          */
 229         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
 230                 memset(&cdev->private->dma_area->irb, 0, sizeof(struct irb));
 231
 232         /* Copy bits which are valid only for the start function. */
 233         if (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) {
 234                 /* Copy key. */
 235                 cdev_irb->scsw.cmd.key = irb->scsw.cmd.key;
 236                 /* Copy suspend control bit. */
 237                 cdev_irb->scsw.cmd.sctl = irb->scsw.cmd.sctl;
 238                 /* Accumulate deferred condition code. */
 239                 cdev_irb->scsw.cmd.cc |= irb->scsw.cmd.cc;
 240                 /* Copy ccw format bit. */
 241                 cdev_irb->scsw.cmd.fmt = irb->scsw.cmd.fmt;
 242                 /* Copy prefetch bit. */
 243                 cdev_irb->scsw.cmd.pfch = irb->scsw.cmd.pfch;
 244                 /* Copy initial-status-interruption-control. */
 245                 cdev_irb->scsw.cmd.isic = irb->scsw.cmd.isic;
 246                 /* Copy address limit checking control. */
 247                 cdev_irb->scsw.cmd.alcc = irb->scsw.cmd.alcc;
 248                 /* Copy suppress suspend bit. */
 249                 cdev_irb->scsw.cmd.ssi = irb->scsw.cmd.ssi;
 250         }
 251
 252         /* Take care of the extended control bit and extended control word. */
 253         ccw_device_accumulate_ecw(cdev, irb);
 254
 255         /* Accumulate function control. */
 256         cdev_irb->scsw.cmd.fctl |= irb->scsw.cmd.fctl;
 257         /* Copy activity control. */
 258         cdev_irb->scsw.cmd.actl = irb->scsw.cmd.actl;
 259         /* Accumulate status control. */
 260         cdev_irb->scsw.cmd.stctl |= irb->scsw.cmd.stctl;
 261         /*
 262          * Copy ccw address if it is valid. This is a bit simplified
 263          * but should be close enough for all practical purposes.
 264          */
 265         if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) ||
 266             ((irb->scsw.cmd.stctl ==
 267               (SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
 268              (irb->scsw.cmd.actl & SCSW_ACTL_DEVACT) &&
 269              (irb->scsw.cmd.actl & SCSW_ACTL_SCHACT)) ||
 270             (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
 271                 cdev_irb->scsw.cmd.cpa = irb->scsw.cmd.cpa;
 272         /* Accumulate device status, but not the device busy flag. */
 273         cdev_irb->scsw.cmd.dstat &= ~DEV_STAT_BUSY;
 274         /* dstat is not always valid. */
 275         if (irb->scsw.cmd.stctl &
 276             (SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
 277              | SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
 278                 cdev_irb->scsw.cmd.dstat |= irb->scsw.cmd.dstat;
 279         /* Accumulate subchannel status. */
 280         cdev_irb->scsw.cmd.cstat |= irb->scsw.cmd.cstat;
 281         /* Copy residual count if it is valid. */
 282         if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
 283             (irb->scsw.cmd.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN))
 284              == 0)
 285                 cdev_irb->scsw.cmd.count = irb->scsw.cmd.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.cmd.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         int rc;
 316
 317         sch = to_subchannel(cdev->dev.parent);
 318
 319         /* A sense is required, can we do it now ? */
 320         if (scsw_actl(&irb->scsw) & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT))
 321                 /*
 322                  * we received an Unit Check but we have no final
 323                  *  status yet, therefore we must delay the SENSE
 324                  *  processing. We must not report this intermediate
 325                  *  status to the device interrupt handler.
 326                  */
 327                 return -EBUSY;
 328
 329         /*
 330          * We have ending status but no sense information. Do a basic sense.
 331          */
 332         sense_ccw = &to_io_private(sch)->dma_area->sense_ccw;
 333         sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
 334         sense_ccw->cda = (__u32) __pa(cdev->private->dma_area->irb.ecw);
 335         sense_ccw->count = SENSE_MAX_COUNT;
 336         sense_ccw->flags = CCW_FLAG_SLI;
 337
 338         rc = cio_start(sch, sense_ccw, 0xff);
 339         if (rc == -ENODEV || rc == -EACCES)
 340                 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
 341         return rc;
 342 }
 343
 344 /*
 345  * Add information from basic sense to devstat.
 346  */
 347 void
 348 ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
 349 {
 350         /*
 351          * Check if the status pending bit is set in stctl.
 352          * If not, the remaining bit have no meaning and we must ignore them.
 353          * The esw is not meaningful as well...
 354          */
 355         if (!(scsw_stctl(&irb->scsw) & SCSW_STCTL_STATUS_PEND))
 356                 return;
 357
 358         /* Check for channel checks and interface control checks. */
 359         ccw_device_msg_control_check(cdev, irb);
 360
 361         /* Check for path not operational. */
 362         if (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
 363                 ccw_device_path_notoper(cdev);
 364
 365         if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
 366             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END)) {
 367                 cdev->private->dma_area->irb.esw.esw0.erw.cons = 1;
 368                 cdev->private->flags.dosense = 0;
 369         }
 370         /* Check if path verification is required. */
 371         if (ccw_device_accumulate_esw_valid(irb) &&
 372             irb->esw.esw0.erw.pvrf)
 373                 cdev->private->flags.doverify = 1;
 374 }
 375
 376 /*
 377  * This function accumulates the status into the private devstat and
 378  * starts a basic sense if one is needed.
 379  */
 380 int
 381 ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
 382 {
 383         ccw_device_accumulate_irb(cdev, irb);
 384         if ((irb->scsw.cmd.actl  & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
 385                 return -EBUSY;
 386         /* Check for basic sense. */
 387         if (cdev->private->flags.dosense &&
 388             !(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)) {
 389                 cdev->private->dma_area->irb.esw.esw0.erw.cons = 1;
 390                 cdev->private->flags.dosense = 0;
 391                 return 0;
 392         }
 393         if (cdev->private->flags.dosense) {
 394                 ccw_device_do_sense(cdev, irb);
 395                 return -EBUSY;
 396         }
 397         return 0;
 398 }
 399