drivers/s390/cio/device_ops.c

   1 /*
   2  *  drivers/s390/cio/device_ops.c
   3  *
   4  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
   5  *                       IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
   7  *               Cornelia Huck (cornelia.huck@de.ibm.com)
   8  */
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/slab.h>
  13 #include <linux/list.h>
  14 #include <linux/device.h>
  15 #include <linux/delay.h>
  16
  17 #include <asm/ccwdev.h>
  18 #include <asm/idals.h>
  19
  20 #include "cio.h"
  21 #include "cio_debug.h"
  22 #include "css.h"
  23 #include "chsc.h"
  24 #include "device.h"
  25
  26 int
  27 ccw_device_set_options(struct ccw_device *cdev, unsigned long flags)
  28 {
  29        /*
  30         * The flag usage is mutal exclusive ...
  31         */
  32         if ((flags & CCWDEV_EARLY_NOTIFICATION) &&
  33             (flags & CCWDEV_REPORT_ALL))
  34                 return -EINVAL;
  35         cdev->private->options.fast = (flags & CCWDEV_EARLY_NOTIFICATION) != 0;
  36         cdev->private->options.repall = (flags & CCWDEV_REPORT_ALL) != 0;
  37         cdev->private->options.pgroup = (flags & CCWDEV_DO_PATHGROUP) != 0;
  38         cdev->private->options.force = (flags & CCWDEV_ALLOW_FORCE) != 0;
  39         return 0;
  40 }
  41
  42 int
  43 ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
  44 {
  45         struct subchannel *sch;
  46         int ret;
  47
  48         if (!cdev)
  49                 return -ENODEV;
  50         if (cdev->private->state == DEV_STATE_NOT_OPER)
  51                 return -ENODEV;
  52         if (cdev->private->state != DEV_STATE_ONLINE &&
  53             cdev->private->state != DEV_STATE_W4SENSE)
  54                 return -EINVAL;
  55         sch = to_subchannel(cdev->dev.parent);
  56         if (!sch)
  57                 return -ENODEV;
  58         ret = cio_clear(sch);
  59         if (ret == 0)
  60                 cdev->private->intparm = intparm;
  61         return ret;
  62 }
  63
  64 int
  65 ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
  66                      unsigned long intparm, __u8 lpm, __u8 key,
  67                      unsigned long flags)
  68 {
  69         struct subchannel *sch;
  70         int ret;
  71
  72         if (!cdev)
  73                 return -ENODEV;
  74         sch = to_subchannel(cdev->dev.parent);
  75         if (!sch)
  76                 return -ENODEV;
  77         if (cdev->private->state == DEV_STATE_NOT_OPER)
  78                 return -ENODEV;
  79         if (cdev->private->state == DEV_STATE_VERIFY ||
  80             cdev->private->state == DEV_STATE_CLEAR_VERIFY) {
  81                 /* Remember to fake irb when finished. */
  82                 if (!cdev->private->flags.fake_irb) {
  83                         cdev->private->flags.fake_irb = 1;
  84                         cdev->private->intparm = intparm;
  85                         return 0;
  86                 } else
  87                         /* There's already a fake I/O around. */
  88                         return -EBUSY;
  89         }
  90         if (cdev->private->state != DEV_STATE_ONLINE ||
  91             ((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
  92              !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
  93             cdev->private->flags.doverify)
  94                 return -EBUSY;
  95         ret = cio_set_options (sch, flags);
  96         if (ret)
  97                 return ret;
  98         /* Adjust requested path mask to excluded varied off paths. */
  99         if (lpm) {
 100                 lpm &= sch->opm;
 101                 if (lpm == 0)
 102                         return -EACCES;
 103         }
 104         ret = cio_start_key (sch, cpa, lpm, key);
 105         if (ret == 0)
 106                 cdev->private->intparm = intparm;
 107         return ret;
 108 }
 109
 110
 111 int
 112 ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
 113                              unsigned long intparm, __u8 lpm, __u8 key,
 114                              unsigned long flags, int expires)
 115 {
 116         int ret;
 117
 118         if (!cdev)
 119                 return -ENODEV;
 120         ccw_device_set_timeout(cdev, expires);
 121         ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
 122         if (ret != 0)
 123                 ccw_device_set_timeout(cdev, 0);
 124         return ret;
 125 }
 126
 127 int
 128 ccw_device_start(struct ccw_device *cdev, struct ccw1 *cpa,
 129                  unsigned long intparm, __u8 lpm, unsigned long flags)
 130 {
 131         return ccw_device_start_key(cdev, cpa, intparm, lpm,
 132                                     PAGE_DEFAULT_KEY, flags);
 133 }
 134
 135 int
 136 ccw_device_start_timeout(struct ccw_device *cdev, struct ccw1 *cpa,
 137                          unsigned long intparm, __u8 lpm, unsigned long flags,
 138                          int expires)
 139 {
 140         return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
 141                                             PAGE_DEFAULT_KEY, flags,
 142                                             expires);
 143 }
 144
 145
 146 int
 147 ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
 148 {
 149         struct subchannel *sch;
 150         int ret;
 151
 152         if (!cdev)
 153                 return -ENODEV;
 154         if (cdev->private->state == DEV_STATE_NOT_OPER)
 155                 return -ENODEV;
 156         if (cdev->private->state != DEV_STATE_ONLINE &&
 157             cdev->private->state != DEV_STATE_W4SENSE)
 158                 return -EINVAL;
 159         sch = to_subchannel(cdev->dev.parent);
 160         if (!sch)
 161                 return -ENODEV;
 162         ret = cio_halt(sch);
 163         if (ret == 0)
 164                 cdev->private->intparm = intparm;
 165         return ret;
 166 }
 167
 168 int
 169 ccw_device_resume(struct ccw_device *cdev)
 170 {
 171         struct subchannel *sch;
 172
 173         if (!cdev)
 174                 return -ENODEV;
 175         sch = to_subchannel(cdev->dev.parent);
 176         if (!sch)
 177                 return -ENODEV;
 178         if (cdev->private->state == DEV_STATE_NOT_OPER)
 179                 return -ENODEV;
 180         if (cdev->private->state != DEV_STATE_ONLINE ||
 181             !(sch->schib.scsw.actl & SCSW_ACTL_SUSPENDED))
 182                 return -EINVAL;
 183         return cio_resume(sch);
 184 }
 185
 186 /*
 187  * Pass interrupt to device driver.
 188  */
 189 int
 190 ccw_device_call_handler(struct ccw_device *cdev)
 191 {
 192         struct subchannel *sch;
 193         unsigned int stctl;
 194         int ending_status;
 195
 196         sch = to_subchannel(cdev->dev.parent);
 197
 198         /*
 199          * we allow for the device action handler if .
 200          *  - we received ending status
 201          *  - the action handler requested to see all interrupts
 202          *  - we received an intermediate status
 203          *  - fast notification was requested (primary status)
 204          *  - unsolicited interrupts
 205          */
 206         stctl = cdev->private->irb.scsw.stctl;
 207         ending_status = (stctl & SCSW_STCTL_SEC_STATUS) ||
 208                 (stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) ||
 209                 (stctl == SCSW_STCTL_STATUS_PEND);
 210         if (!ending_status &&
 211             !cdev->private->options.repall &&
 212             !(stctl & SCSW_STCTL_INTER_STATUS) &&
 213             !(cdev->private->options.fast &&
 214               (stctl & SCSW_STCTL_PRIM_STATUS)))
 215                 return 0;
 216
 217         /* Clear pending timers for device driver initiated I/O. */
 218         if (ending_status)
 219                 ccw_device_set_timeout(cdev, 0);
 220         /*
 221          * Now we are ready to call the device driver interrupt handler.
 222          */
 223         if (cdev->handler)
 224                 cdev->handler(cdev, cdev->private->intparm,
 225                               &cdev->private->irb);
 226
 227         /*
 228          * Clear the old and now useless interrupt response block.
 229          */
 230         memset(&cdev->private->irb, 0, sizeof(struct irb));
 231
 232         return 1;
 233 }
 234
 235 /*
 236  * Search for CIW command in extended sense data.
 237  */
 238 struct ciw *
 239 ccw_device_get_ciw(struct ccw_device *cdev, __u32 ct)
 240 {
 241         int ciw_cnt;
 242
 243         if (cdev->private->flags.esid == 0)
 244                 return NULL;
 245         for (ciw_cnt = 0; ciw_cnt < MAX_CIWS; ciw_cnt++)
 246                 if (cdev->private->senseid.ciw[ciw_cnt].ct == ct)
 247                         return cdev->private->senseid.ciw + ciw_cnt;
 248         return NULL;
 249 }
 250
 251 __u8
 252 ccw_device_get_path_mask(struct ccw_device *cdev)
 253 {
 254         struct subchannel *sch;
 255
 256         sch = to_subchannel(cdev->dev.parent);
 257         if (!sch)
 258                 return 0;
 259         else
 260                 return sch->lpm;
 261 }
 262
 263 static void
 264 ccw_device_wake_up(struct ccw_device *cdev, unsigned long ip, struct irb *irb)
 265 {
 266         if (!ip)
 267                 /* unsolicited interrupt */
 268                 return;
 269
 270         /* Abuse intparm for error reporting. */
 271         if (IS_ERR(irb))
 272                 cdev->private->intparm = -EIO;
 273         else if (irb->scsw.cc == 1)
 274                 /* Retry for deferred condition code. */
 275                 cdev->private->intparm = -EAGAIN;
 276         else if ((irb->scsw.dstat !=
 277                   (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
 278                  (irb->scsw.cstat != 0)) {
 279                 /*
 280                  * We didn't get channel end / device end. Check if path
 281                  * verification has been started; we can retry after it has
 282                  * finished. We also retry unit checks except for command reject
 283                  * or intervention required. Also check for long busy
 284                  * conditions.
 285                  */
 286                  if (cdev->private->flags.doverify ||
 287                          cdev->private->state == DEV_STATE_VERIFY)
 288                          cdev->private->intparm = -EAGAIN;
 289                 else if ((irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
 290                          !(irb->ecw[0] &
 291                            (SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ)))
 292                         cdev->private->intparm = -EAGAIN;
 293                 else if ((irb->scsw.dstat & DEV_STAT_ATTENTION) &&
 294                          (irb->scsw.dstat & DEV_STAT_DEV_END) &&
 295                          (irb->scsw.dstat & DEV_STAT_UNIT_EXCEP))
 296                         cdev->private->intparm = -EAGAIN;
 297                  else
 298                          cdev->private->intparm = -EIO;
 299
 300         } else
 301                 cdev->private->intparm = 0;
 302         wake_up(&cdev->private->wait_q);
 303 }
 304
 305 static inline int
 306 __ccw_device_retry_loop(struct ccw_device *cdev, struct ccw1 *ccw, long magic, __u8 lpm)
 307 {
 308         int ret;
 309         struct subchannel *sch;
 310
 311         sch = to_subchannel(cdev->dev.parent);
 312         do {
 313                 ccw_device_set_timeout(cdev, 60 * HZ);
 314                 ret = cio_start (sch, ccw, lpm);
 315                 if (ret != 0)
 316                         ccw_device_set_timeout(cdev, 0);
 317                 if (ret == -EBUSY) {
 318                         /* Try again later. */
 319                         spin_unlock_irq(&sch->lock);
 320                         msleep(10);
 321                         spin_lock_irq(&sch->lock);
 322                         continue;
 323                 }
 324                 if (ret != 0)
 325                         /* Non-retryable error. */
 326                         break;
 327                 /* Wait for end of request. */
 328                 cdev->private->intparm = magic;
 329                 spin_unlock_irq(&sch->lock);
 330                 wait_event(cdev->private->wait_q,
 331                            (cdev->private->intparm == -EIO) ||
 332                            (cdev->private->intparm == -EAGAIN) ||
 333                            (cdev->private->intparm == 0));
 334                 spin_lock_irq(&sch->lock);
 335                 /* Check at least for channel end / device end */
 336                 if (cdev->private->intparm == -EIO) {
 337                         /* Non-retryable error. */
 338                         ret = -EIO;
 339                         break;
 340                 }
 341                 if (cdev->private->intparm == 0)
 342                         /* Success. */
 343                         break;
 344                 /* Try again later. */
 345                 spin_unlock_irq(&sch->lock);
 346                 msleep(10);
 347                 spin_lock_irq(&sch->lock);
 348         } while (1);
 349
 350         return ret;
 351 }
 352
 353 /**
 354  * read_dev_chars() - read device characteristics
 355  * @param cdev   target ccw device
 356  * @param buffer pointer to buffer for rdc data
 357  * @param length size of rdc data
 358  * @returns 0 for success, negative error value on failure
 359  *
 360  * Context:
 361  *   called for online device, lock not held
 362  **/
 363 int
 364 read_dev_chars (struct ccw_device *cdev, void **buffer, int length)
 365 {
 366         void (*handler)(struct ccw_device *, unsigned long, struct irb *);
 367         struct subchannel *sch;
 368         int ret;
 369         struct ccw1 *rdc_ccw;
 370
 371         if (!cdev)
 372                 return -ENODEV;
 373         if (!buffer || !length)
 374                 return -EINVAL;
 375         sch = to_subchannel(cdev->dev.parent);
 376
 377         CIO_TRACE_EVENT (4, "rddevch");
 378         CIO_TRACE_EVENT (4, sch->dev.bus_id);
 379
 380         rdc_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
 381         if (!rdc_ccw)
 382                 return -ENOMEM;
 383         rdc_ccw->cmd_code = CCW_CMD_RDC;
 384         rdc_ccw->count = length;
 385         rdc_ccw->flags = CCW_FLAG_SLI;
 386         ret = set_normalized_cda (rdc_ccw, (*buffer));
 387         if (ret != 0) {
 388                 kfree(rdc_ccw);
 389                 return ret;
 390         }
 391
 392         spin_lock_irq(&sch->lock);
 393         /* Save interrupt handler. */
 394         handler = cdev->handler;
 395         /* Temporarily install own handler. */
 396         cdev->handler = ccw_device_wake_up;
 397         if (cdev->private->state != DEV_STATE_ONLINE)
 398                 ret = -ENODEV;
 399         else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
 400                   !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
 401                  cdev->private->flags.doverify)
 402                 ret = -EBUSY;
 403         else
 404                 /* 0x00D9C4C3 == ebcdic "RDC" */
 405                 ret = __ccw_device_retry_loop(cdev, rdc_ccw, 0x00D9C4C3, 0);
 406
 407         /* Restore interrupt handler. */
 408         cdev->handler = handler;
 409         spin_unlock_irq(&sch->lock);
 410
 411         clear_normalized_cda (rdc_ccw);
 412         kfree(rdc_ccw);
 413
 414         return ret;
 415 }
 416
 417 /*
 418  *  Read Configuration data using path mask
 419  */
 420 int
 421 read_conf_data_lpm (struct ccw_device *cdev, void **buffer, int *length, __u8 lpm)
 422 {
 423         void (*handler)(struct ccw_device *, unsigned long, struct irb *);
 424         struct subchannel *sch;
 425         struct ciw *ciw;
 426         char *rcd_buf;
 427         int ret;
 428         struct ccw1 *rcd_ccw;
 429
 430         if (!cdev)
 431                 return -ENODEV;
 432         if (!buffer || !length)
 433                 return -EINVAL;
 434         sch = to_subchannel(cdev->dev.parent);
 435
 436         CIO_TRACE_EVENT (4, "rdconf");
 437         CIO_TRACE_EVENT (4, sch->dev.bus_id);
 438
 439         /*
 440          * scan for RCD command in extended SenseID data
 441          */
 442         ciw = ccw_device_get_ciw(cdev, CIW_TYPE_RCD);
 443         if (!ciw || ciw->cmd == 0)
 444                 return -EOPNOTSUPP;
 445
 446         /* Adjust requested path mask to excluded varied off paths. */
 447         if (lpm) {
 448                 lpm &= sch->opm;
 449                 if (lpm == 0)
 450                         return -EACCES;
 451         }
 452
 453         rcd_ccw = kzalloc(sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
 454         if (!rcd_ccw)
 455                 return -ENOMEM;
 456         rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
 457         if (!rcd_buf) {
 458                 kfree(rcd_ccw);
 459                 return -ENOMEM;
 460         }
 461         rcd_ccw->cmd_code = ciw->cmd;
 462         rcd_ccw->cda = (__u32) __pa (rcd_buf);
 463         rcd_ccw->count = ciw->count;
 464         rcd_ccw->flags = CCW_FLAG_SLI;
 465
 466         spin_lock_irq(&sch->lock);
 467         /* Save interrupt handler. */
 468         handler = cdev->handler;
 469         /* Temporarily install own handler. */
 470         cdev->handler = ccw_device_wake_up;
 471         if (cdev->private->state != DEV_STATE_ONLINE)
 472                 ret = -ENODEV;
 473         else if (((sch->schib.scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
 474                   !(sch->schib.scsw.stctl & SCSW_STCTL_SEC_STATUS)) ||
 475                  cdev->private->flags.doverify)
 476                 ret = -EBUSY;
 477         else
 478                 /* 0x00D9C3C4 == ebcdic "RCD" */
 479                 ret = __ccw_device_retry_loop(cdev, rcd_ccw, 0x00D9C3C4, lpm);
 480
 481         /* Restore interrupt handler. */
 482         cdev->handler = handler;
 483         spin_unlock_irq(&sch->lock);
 484
 485         /*
 486          * on success we update the user input parms
 487          */
 488         if (ret) {
 489                 kfree (rcd_buf);
 490                 *buffer = NULL;
 491                 *length = 0;
 492         } else {
 493                 *length = ciw->count;
 494                 *buffer = rcd_buf;
 495         }
 496         kfree(rcd_ccw);
 497
 498         return ret;
 499 }
 500
 501 /*
 502  *  Read Configuration data
 503  */
 504 int
 505 read_conf_data (struct ccw_device *cdev, void **buffer, int *length)
 506 {
 507         return read_conf_data_lpm (cdev, buffer, length, 0);
 508 }
 509
 510 /*
 511  * Try to break the lock on a boxed device.
 512  */
 513 int
 514 ccw_device_stlck(struct ccw_device *cdev)
 515 {
 516         void *buf, *buf2;
 517         unsigned long flags;
 518         struct subchannel *sch;
 519         int ret;
 520
 521         if (!cdev)
 522                 return -ENODEV;
 523
 524         if (cdev->drv && !cdev->private->options.force)
 525                 return -EINVAL;
 526
 527         sch = to_subchannel(cdev->dev.parent);
 528
 529         CIO_TRACE_EVENT(2, "stl lock");
 530         CIO_TRACE_EVENT(2, cdev->dev.bus_id);
 531
 532         buf = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
 533         if (!buf)
 534                 return -ENOMEM;
 535         buf2 = kmalloc(32*sizeof(char), GFP_DMA|GFP_KERNEL);
 536         if (!buf2) {
 537                 kfree(buf);
 538                 return -ENOMEM;
 539         }
 540         spin_lock_irqsave(&sch->lock, flags);
 541         ret = cio_enable_subchannel(sch, 3);
 542         if (ret)
 543                 goto out_unlock;
 544         /*
 545          * Setup ccw. We chain an unconditional reserve and a release so we
 546          * only break the lock.
 547          */
 548         cdev->private->iccws[0].cmd_code = CCW_CMD_STLCK;
 549         cdev->private->iccws[0].cda = (__u32) __pa(buf);
 550         cdev->private->iccws[0].count = 32;
 551         cdev->private->iccws[0].flags = CCW_FLAG_CC;
 552         cdev->private->iccws[1].cmd_code = CCW_CMD_RELEASE;
 553         cdev->private->iccws[1].cda = (__u32) __pa(buf2);
 554         cdev->private->iccws[1].count = 32;
 555         cdev->private->iccws[1].flags = 0;
 556         ret = cio_start(sch, cdev->private->iccws, 0);
 557         if (ret) {
 558                 cio_disable_subchannel(sch); //FIXME: return code?
 559                 goto out_unlock;
 560         }
 561         cdev->private->irb.scsw.actl |= SCSW_ACTL_START_PEND;
 562         spin_unlock_irqrestore(&sch->lock, flags);
 563         wait_event(cdev->private->wait_q, cdev->private->irb.scsw.actl == 0);
 564         spin_lock_irqsave(&sch->lock, flags);
 565         cio_disable_subchannel(sch); //FIXME: return code?
 566         if ((cdev->private->irb.scsw.dstat !=
 567              (DEV_STAT_CHN_END|DEV_STAT_DEV_END)) ||
 568             (cdev->private->irb.scsw.cstat != 0))
 569                 ret = -EIO;
 570         /* Clear irb. */
 571         memset(&cdev->private->irb, 0, sizeof(struct irb));
 572 out_unlock:
 573         kfree(buf);
 574         kfree(buf2);
 575         spin_unlock_irqrestore(&sch->lock, flags);
 576         return ret;
 577 }
 578
 579 void *
 580 ccw_device_get_chp_desc(struct ccw_device *cdev, int chp_no)
 581 {
 582         struct subchannel *sch;
 583
 584         sch = to_subchannel(cdev->dev.parent);
 585         return chsc_get_chp_desc(sch, chp_no);
 586 }
 587
 588 // FIXME: these have to go:
 589
 590 int
 591 _ccw_device_get_subchannel_number(struct ccw_device *cdev)
 592 {
 593         return cdev->private->schid.sch_no;
 594 }
 595
 596 int
 597 _ccw_device_get_device_number(struct ccw_device *cdev)
 598 {
 599         return cdev->private->dev_id.devno;
 600 }
 601
 602
 603 MODULE_LICENSE("GPL");
 604 EXPORT_SYMBOL(ccw_device_set_options);
 605 EXPORT_SYMBOL(ccw_device_clear);
 606 EXPORT_SYMBOL(ccw_device_halt);
 607 EXPORT_SYMBOL(ccw_device_resume);
 608 EXPORT_SYMBOL(ccw_device_start_timeout);
 609 EXPORT_SYMBOL(ccw_device_start);
 610 EXPORT_SYMBOL(ccw_device_start_timeout_key);
 611 EXPORT_SYMBOL(ccw_device_start_key);
 612 EXPORT_SYMBOL(ccw_device_get_ciw);
 613 EXPORT_SYMBOL(ccw_device_get_path_mask);
 614 EXPORT_SYMBOL(read_conf_data);
 615 EXPORT_SYMBOL(read_dev_chars);
 616 EXPORT_SYMBOL(_ccw_device_get_subchannel_number);
 617 EXPORT_SYMBOL(_ccw_device_get_device_number);
 618 EXPORT_SYMBOL_GPL(ccw_device_get_chp_desc);
 619 EXPORT_SYMBOL_GPL(read_conf_data_lpm);