drivers/s390/cio/qdio_main.c

   1 /*
   2  * linux/drivers/s390/cio/qdio_main.c
   3  *
   4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   5  *
   6  * Copyright 2000,2008 IBM Corp.
   7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   8  *            Jan Glauber <jang@linux.vnet.ibm.com>
   9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include <asm/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19
  20 #include "cio.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "qdio.h"
  24 #include "qdio_debug.h"
  25
  26 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  27         "Jan Glauber <jang@linux.vnet.ibm.com>");
  28 MODULE_DESCRIPTION("QDIO base support");
  29 MODULE_LICENSE("GPL");
  30
  31 static inline int do_siga_sync(struct subchannel_id schid,
  32                                unsigned int out_mask, unsigned int in_mask)
  33 {
  34         register unsigned long __fc asm ("0") = 2;
  35         register struct subchannel_id __schid asm ("1") = schid;
  36         register unsigned long out asm ("2") = out_mask;
  37         register unsigned long in asm ("3") = in_mask;
  38         int cc;
  39
  40         asm volatile(
  41                 "       siga    0\n"
  42                 "       ipm     %0\n"
  43                 "       srl     %0,28\n"
  44                 : "=d" (cc)
  45                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  46         return cc;
  47 }
  48
  49 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
  50 {
  51         register unsigned long __fc asm ("0") = 1;
  52         register struct subchannel_id __schid asm ("1") = schid;
  53         register unsigned long __mask asm ("2") = mask;
  54         int cc;
  55
  56         asm volatile(
  57                 "       siga    0\n"
  58                 "       ipm     %0\n"
  59                 "       srl     %0,28\n"
  60                 : "=d" (cc)
  61                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  62         return cc;
  63 }
  64
  65 /**
  66  * do_siga_output - perform SIGA-w/wt function
  67  * @schid: subchannel id or in case of QEBSM the subchannel token
  68  * @mask: which output queues to process
  69  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  70  * @fc: function code to perform
  71  *
  72  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
  73  * Note: For IQDC unicast queues only the highest priority queue is processed.
  74  */
  75 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  76                                  unsigned int *bb, unsigned int fc)
  77 {
  78         register unsigned long __fc asm("0") = fc;
  79         register unsigned long __schid asm("1") = schid;
  80         register unsigned long __mask asm("2") = mask;
  81         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  82
  83         asm volatile(
  84                 "       siga    0\n"
  85                 "0:     ipm     %0\n"
  86                 "       srl     %0,28\n"
  87                 "1:\n"
  88                 EX_TABLE(0b, 1b)
  89                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
  90                 : : "cc", "memory");
  91         *bb = ((unsigned int) __fc) >> 31;
  92         return cc;
  93 }
  94
  95 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
  96 {
  97         /* all done or next buffer state different */
  98         if (ccq == 0 || ccq == 32)
  99                 return 0;
 100         /* not all buffers processed */
 101         if (ccq == 96 || ccq == 97)
 102                 return 1;
 103         /* notify devices immediately */
 104         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 105         return -EIO;
 106 }
 107
 108 /**
 109  * qdio_do_eqbs - extract buffer states for QEBSM
 110  * @q: queue to manipulate
 111  * @state: state of the extracted buffers
 112  * @start: buffer number to start at
 113  * @count: count of buffers to examine
 114  * @auto_ack: automatically acknowledge buffers
 115  *
 116  * Returns the number of successfully extracted equal buffer states.
 117  * Stops processing if a state is different from the last buffers state.
 118  */
 119 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 120                         int start, int count, int auto_ack)
 121 {
 122         unsigned int ccq = 0;
 123         int tmp_count = count, tmp_start = start;
 124         int nr = q->nr;
 125         int rc;
 126
 127         BUG_ON(!q->irq_ptr->sch_token);
 128         qperf_inc(q, eqbs);
 129
 130         if (!q->is_input_q)
 131                 nr += q->irq_ptr->nr_input_qs;
 132 again:
 133         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 134                       auto_ack);
 135         rc = qdio_check_ccq(q, ccq);
 136
 137         /* At least one buffer was processed, return and extract the remaining
 138          * buffers later.
 139          */
 140         if ((ccq == 96) && (count != tmp_count)) {
 141                 qperf_inc(q, eqbs_partial);
 142                 return (count - tmp_count);
 143         }
 144
 145         if (rc == 1) {
 146                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 147                 goto again;
 148         }
 149
 150         if (rc < 0) {
 151                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 152                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 153                 q->handler(q->irq_ptr->cdev,
 154                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 155                            0, -1, -1, q->irq_ptr->int_parm);
 156                 return 0;
 157         }
 158         return count - tmp_count;
 159 }
 160
 161 /**
 162  * qdio_do_sqbs - set buffer states for QEBSM
 163  * @q: queue to manipulate
 164  * @state: new state of the buffers
 165  * @start: first buffer number to change
 166  * @count: how many buffers to change
 167  *
 168  * Returns the number of successfully changed buffers.
 169  * Does retrying until the specified count of buffer states is set or an
 170  * error occurs.
 171  */
 172 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 173                         int count)
 174 {
 175         unsigned int ccq = 0;
 176         int tmp_count = count, tmp_start = start;
 177         int nr = q->nr;
 178         int rc;
 179
 180         if (!count)
 181                 return 0;
 182
 183         BUG_ON(!q->irq_ptr->sch_token);
 184         qperf_inc(q, sqbs);
 185
 186         if (!q->is_input_q)
 187                 nr += q->irq_ptr->nr_input_qs;
 188 again:
 189         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 190         rc = qdio_check_ccq(q, ccq);
 191         if (rc == 1) {
 192                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 193                 qperf_inc(q, sqbs_partial);
 194                 goto again;
 195         }
 196         if (rc < 0) {
 197                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 198                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 199                 q->handler(q->irq_ptr->cdev,
 200                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 201                            0, -1, -1, q->irq_ptr->int_parm);
 202                 return 0;
 203         }
 204         WARN_ON(tmp_count);
 205         return count - tmp_count;
 206 }
 207
 208 /* returns number of examined buffers and their common state in *state */
 209 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 210                                  unsigned char *state, unsigned int count,
 211                                  int auto_ack)
 212 {
 213         unsigned char __state = 0;
 214         int i;
 215
 216         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 217         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 218
 219         if (is_qebsm(q))
 220                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 221
 222         for (i = 0; i < count; i++) {
 223                 if (!__state)
 224                         __state = q->slsb.val[bufnr];
 225                 else if (q->slsb.val[bufnr] != __state)
 226                         break;
 227                 bufnr = next_buf(bufnr);
 228         }
 229         *state = __state;
 230         return i;
 231 }
 232
 233 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 234                                 unsigned char *state, int auto_ack)
 235 {
 236         return get_buf_states(q, bufnr, state, 1, auto_ack);
 237 }
 238
 239 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 240 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 241                                  unsigned char state, int count)
 242 {
 243         int i;
 244
 245         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 246         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 247
 248         if (is_qebsm(q))
 249                 return qdio_do_sqbs(q, state, bufnr, count);
 250
 251         for (i = 0; i < count; i++) {
 252                 xchg(&q->slsb.val[bufnr], state);
 253                 bufnr = next_buf(bufnr);
 254         }
 255         return count;
 256 }
 257
 258 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 259                                 unsigned char state)
 260 {
 261         return set_buf_states(q, bufnr, state, 1);
 262 }
 263
 264 /* set slsb states to initial state */
 265 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 266 {
 267         struct qdio_q *q;
 268         int i;
 269
 270         for_each_input_queue(irq_ptr, q, i)
 271                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 272                                QDIO_MAX_BUFFERS_PER_Q);
 273         for_each_output_queue(irq_ptr, q, i)
 274                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 275                                QDIO_MAX_BUFFERS_PER_Q);
 276 }
 277
 278 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 279                           unsigned int input)
 280 {
 281         int cc;
 282
 283         if (!need_siga_sync(q))
 284                 return 0;
 285
 286         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 287         qperf_inc(q, siga_sync);
 288
 289         cc = do_siga_sync(q->irq_ptr->schid, output, input);
 290         if (cc)
 291                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 292         return cc;
 293 }
 294
 295 static inline int qdio_siga_sync_q(struct qdio_q *q)
 296 {
 297         if (q->is_input_q)
 298                 return qdio_siga_sync(q, 0, q->mask);
 299         else
 300                 return qdio_siga_sync(q, q->mask, 0);
 301 }
 302
 303 static inline int qdio_siga_sync_out(struct qdio_q *q)
 304 {
 305         return qdio_siga_sync(q, ~0U, 0);
 306 }
 307
 308 static inline int qdio_siga_sync_all(struct qdio_q *q)
 309 {
 310         return qdio_siga_sync(q, ~0U, ~0U);
 311 }
 312
 313 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 314 {
 315         unsigned long schid;
 316         unsigned int fc = 0;
 317         u64 start_time = 0;
 318         int cc;
 319
 320         if (q->u.out.use_enh_siga)
 321                 fc = 3;
 322
 323         if (is_qebsm(q)) {
 324                 schid = q->irq_ptr->sch_token;
 325                 fc |= 0x80;
 326         }
 327         else
 328                 schid = *((u32 *)&q->irq_ptr->schid);
 329
 330 again:
 331         cc = do_siga_output(schid, q->mask, busy_bit, fc);
 332
 333         /* hipersocket busy condition */
 334         if (*busy_bit) {
 335                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 336
 337                 if (!start_time) {
 338                         start_time = get_usecs();
 339                         goto again;
 340                 }
 341                 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 342                         goto again;
 343         }
 344         return cc;
 345 }
 346
 347 static inline int qdio_siga_input(struct qdio_q *q)
 348 {
 349         int cc;
 350
 351         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 352         qperf_inc(q, siga_read);
 353
 354         cc = do_siga_input(q->irq_ptr->schid, q->mask);
 355         if (cc)
 356                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 357         return cc;
 358 }
 359
 360 static inline void qdio_sync_after_thinint(struct qdio_q *q)
 361 {
 362         if (pci_out_supported(q)) {
 363                 if (need_siga_sync_thinint(q))
 364                         qdio_siga_sync_all(q);
 365                 else if (need_siga_sync_out_thinint(q))
 366                         qdio_siga_sync_out(q);
 367         } else
 368                 qdio_siga_sync_q(q);
 369 }
 370
 371 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 372                         unsigned char *state)
 373 {
 374         qdio_siga_sync_q(q);
 375         return get_buf_states(q, bufnr, state, 1, 0);
 376 }
 377
 378 static inline void qdio_stop_polling(struct qdio_q *q)
 379 {
 380         if (!q->u.in.polling)
 381                 return;
 382
 383         q->u.in.polling = 0;
 384         qperf_inc(q, stop_polling);
 385
 386         /* show the card that we are not polling anymore */
 387         if (is_qebsm(q)) {
 388                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 389                                q->u.in.ack_count);
 390                 q->u.in.ack_count = 0;
 391         } else
 392                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 393 }
 394
 395 static void announce_buffer_error(struct qdio_q *q, int count)
 396 {
 397         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 398
 399         /* special handling for no target buffer empty */
 400         if ((!q->is_input_q &&
 401             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 402                 qperf_inc(q, target_full);
 403                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 404                               q->first_to_check);
 405                 return;
 406         }
 407
 408         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 409         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 410         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 411         DBF_ERROR("F14:%2x F15:%2x",
 412                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 413                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 414 }
 415
 416 static inline void inbound_primed(struct qdio_q *q, int count)
 417 {
 418         int new;
 419
 420         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 421
 422         /* for QEBSM the ACK was already set by EQBS */
 423         if (is_qebsm(q)) {
 424                 if (!q->u.in.polling) {
 425                         q->u.in.polling = 1;
 426                         q->u.in.ack_count = count;
 427                         q->u.in.ack_start = q->first_to_check;
 428                         return;
 429                 }
 430
 431                 /* delete the previous ACK's */
 432                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 433                                q->u.in.ack_count);
 434                 q->u.in.ack_count = count;
 435                 q->u.in.ack_start = q->first_to_check;
 436                 return;
 437         }
 438
 439         /*
 440          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 441          * or by the next inbound run.
 442          */
 443         new = add_buf(q->first_to_check, count - 1);
 444         if (q->u.in.polling) {
 445                 /* reset the previous ACK but first set the new one */
 446                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 447                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 448         } else {
 449                 q->u.in.polling = 1;
 450                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 451         }
 452
 453         q->u.in.ack_start = new;
 454         count--;
 455         if (!count)
 456                 return;
 457         /* need to change ALL buffers to get more interrupts */
 458         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 459 }
 460
 461 static int get_inbound_buffer_frontier(struct qdio_q *q)
 462 {
 463         int count, stop;
 464         unsigned char state;
 465
 466         /*
 467          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 468          * would return 0.
 469          */
 470         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 471         stop = add_buf(q->first_to_check, count);
 472
 473         if (q->first_to_check == stop)
 474                 goto out;
 475
 476         /*
 477          * No siga sync here, as a PCI or we after a thin interrupt
 478          * already sync'ed the queues.
 479          */
 480         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 481         if (!count)
 482                 goto out;
 483
 484         switch (state) {
 485         case SLSB_P_INPUT_PRIMED:
 486                 inbound_primed(q, count);
 487                 q->first_to_check = add_buf(q->first_to_check, count);
 488                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 489                         qperf_inc(q, inbound_queue_full);
 490                 break;
 491         case SLSB_P_INPUT_ERROR:
 492                 announce_buffer_error(q, count);
 493                 /* process the buffer, the upper layer will take care of it */
 494                 q->first_to_check = add_buf(q->first_to_check, count);
 495                 atomic_sub(count, &q->nr_buf_used);
 496                 break;
 497         case SLSB_CU_INPUT_EMPTY:
 498         case SLSB_P_INPUT_NOT_INIT:
 499         case SLSB_P_INPUT_ACK:
 500                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 501                 break;
 502         default:
 503                 BUG();
 504         }
 505 out:
 506         return q->first_to_check;
 507 }
 508
 509 static int qdio_inbound_q_moved(struct qdio_q *q)
 510 {
 511         int bufnr;
 512
 513         bufnr = get_inbound_buffer_frontier(q);
 514
 515         if ((bufnr != q->last_move) || q->qdio_error) {
 516                 q->last_move = bufnr;
 517                 if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
 518                         q->u.in.timestamp = get_usecs();
 519                 return 1;
 520         } else
 521                 return 0;
 522 }
 523
 524 static inline int qdio_inbound_q_done(struct qdio_q *q)
 525 {
 526         unsigned char state = 0;
 527
 528         if (!atomic_read(&q->nr_buf_used))
 529                 return 1;
 530
 531         qdio_siga_sync_q(q);
 532         get_buf_state(q, q->first_to_check, &state, 0);
 533
 534         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 535                 /* more work coming */
 536                 return 0;
 537
 538         if (is_thinint_irq(q->irq_ptr))
 539                 return 1;
 540
 541         /* don't poll under z/VM */
 542         if (MACHINE_IS_VM)
 543                 return 1;
 544
 545         /*
 546          * At this point we know, that inbound first_to_check
 547          * has (probably) not moved (see qdio_inbound_processing).
 548          */
 549         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 550                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 551                               q->first_to_check);
 552                 return 1;
 553         } else
 554                 return 0;
 555 }
 556
 557 static void qdio_kick_handler(struct qdio_q *q)
 558 {
 559         int start = q->first_to_kick;
 560         int end = q->first_to_check;
 561         int count;
 562
 563         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 564                 return;
 565
 566         count = sub_buf(end, start);
 567
 568         if (q->is_input_q) {
 569                 qperf_inc(q, inbound_handler);
 570                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 571         } else
 572                 qperf_inc(q, outbound_handler);
 573                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 574                               start, count);
 575
 576         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 577                    q->irq_ptr->int_parm);
 578
 579         /* for the next time */
 580         q->first_to_kick = end;
 581         q->qdio_error = 0;
 582 }
 583
 584 static void __qdio_inbound_processing(struct qdio_q *q)
 585 {
 586         qperf_inc(q, tasklet_inbound);
 587 again:
 588         if (!qdio_inbound_q_moved(q))
 589                 return;
 590
 591         qdio_kick_handler(q);
 592
 593         if (!qdio_inbound_q_done(q)) {
 594                 /* means poll time is not yet over */
 595                 qperf_inc(q, tasklet_inbound_resched);
 596                 goto again;
 597         }
 598
 599         qdio_stop_polling(q);
 600         /*
 601          * We need to check again to not lose initiative after
 602          * resetting the ACK state.
 603          */
 604         if (!qdio_inbound_q_done(q)) {
 605                 qperf_inc(q, tasklet_inbound_resched2);
 606                 goto again;
 607         }
 608 }
 609
 610 void qdio_inbound_processing(unsigned long data)
 611 {
 612         struct qdio_q *q = (struct qdio_q *)data;
 613         __qdio_inbound_processing(q);
 614 }
 615
 616 static int get_outbound_buffer_frontier(struct qdio_q *q)
 617 {
 618         int count, stop;
 619         unsigned char state;
 620
 621         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 622             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 623                 qdio_siga_sync_q(q);
 624
 625         /*
 626          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 627          * would return 0.
 628          */
 629         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 630         stop = add_buf(q->first_to_check, count);
 631
 632         if (q->first_to_check == stop)
 633                 return q->first_to_check;
 634
 635         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 636         if (!count)
 637                 return q->first_to_check;
 638
 639         switch (state) {
 640         case SLSB_P_OUTPUT_EMPTY:
 641                 /* the adapter got it */
 642                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
 643
 644                 atomic_sub(count, &q->nr_buf_used);
 645                 q->first_to_check = add_buf(q->first_to_check, count);
 646                 break;
 647         case SLSB_P_OUTPUT_ERROR:
 648                 announce_buffer_error(q, count);
 649                 /* process the buffer, the upper layer will take care of it */
 650                 q->first_to_check = add_buf(q->first_to_check, count);
 651                 atomic_sub(count, &q->nr_buf_used);
 652                 break;
 653         case SLSB_CU_OUTPUT_PRIMED:
 654                 /* the adapter has not fetched the output yet */
 655                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 656                 break;
 657         case SLSB_P_OUTPUT_NOT_INIT:
 658         case SLSB_P_OUTPUT_HALTED:
 659                 break;
 660         default:
 661                 BUG();
 662         }
 663         return q->first_to_check;
 664 }
 665
 666 /* all buffers processed? */
 667 static inline int qdio_outbound_q_done(struct qdio_q *q)
 668 {
 669         return atomic_read(&q->nr_buf_used) == 0;
 670 }
 671
 672 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 673 {
 674         int bufnr;
 675
 676         bufnr = get_outbound_buffer_frontier(q);
 677
 678         if ((bufnr != q->last_move) || q->qdio_error) {
 679                 q->last_move = bufnr;
 680                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 681                 return 1;
 682         } else
 683                 return 0;
 684 }
 685
 686 static int qdio_kick_outbound_q(struct qdio_q *q)
 687 {
 688         unsigned int busy_bit;
 689         int cc;
 690
 691         if (!need_siga_out(q))
 692                 return 0;
 693
 694         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 695         qperf_inc(q, siga_write);
 696
 697         cc = qdio_siga_output(q, &busy_bit);
 698         switch (cc) {
 699         case 0:
 700                 break;
 701         case 2:
 702                 if (busy_bit) {
 703                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 704                         cc |= QDIO_ERROR_SIGA_BUSY;
 705                 } else
 706                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 707                 break;
 708         case 1:
 709         case 3:
 710                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 711                 break;
 712         }
 713         return cc;
 714 }
 715
 716 static void __qdio_outbound_processing(struct qdio_q *q)
 717 {
 718         qperf_inc(q, tasklet_outbound);
 719         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 720
 721         if (qdio_outbound_q_moved(q))
 722                 qdio_kick_handler(q);
 723
 724         if (queue_type(q) == QDIO_ZFCP_QFMT)
 725                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 726                         goto sched;
 727
 728         /* bail out for HiperSockets unicast queues */
 729         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 730                 return;
 731
 732         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 733             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 734                 goto sched;
 735
 736         if (q->u.out.pci_out_enabled)
 737                 return;
 738
 739         /*
 740          * Now we know that queue type is either qeth without pci enabled
 741          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 742          * EMPTY is noticed and outbound_handler is called after some time.
 743          */
 744         if (qdio_outbound_q_done(q))
 745                 del_timer(&q->u.out.timer);
 746         else
 747                 if (!timer_pending(&q->u.out.timer))
 748                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 749         return;
 750
 751 sched:
 752         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 753                 return;
 754         tasklet_schedule(&q->tasklet);
 755 }
 756
 757 /* outbound tasklet */
 758 void qdio_outbound_processing(unsigned long data)
 759 {
 760         struct qdio_q *q = (struct qdio_q *)data;
 761         __qdio_outbound_processing(q);
 762 }
 763
 764 void qdio_outbound_timer(unsigned long data)
 765 {
 766         struct qdio_q *q = (struct qdio_q *)data;
 767
 768         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 769                 return;
 770         tasklet_schedule(&q->tasklet);
 771 }
 772
 773 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 774 {
 775         struct qdio_q *out;
 776         int i;
 777
 778         if (!pci_out_supported(q))
 779                 return;
 780
 781         for_each_output_queue(q->irq_ptr, out, i)
 782                 if (!qdio_outbound_q_done(out))
 783                         tasklet_schedule(&out->tasklet);
 784 }
 785
 786 static void __tiqdio_inbound_processing(struct qdio_q *q)
 787 {
 788         qperf_inc(q, tasklet_inbound);
 789         qdio_sync_after_thinint(q);
 790
 791         /*
 792          * The interrupt could be caused by a PCI request. Check the
 793          * PCI capable outbound queues.
 794          */
 795         qdio_check_outbound_after_thinint(q);
 796
 797         if (!qdio_inbound_q_moved(q))
 798                 return;
 799
 800         qdio_kick_handler(q);
 801
 802         if (!qdio_inbound_q_done(q)) {
 803                 qperf_inc(q, tasklet_inbound_resched);
 804                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 805                         tasklet_schedule(&q->tasklet);
 806                         return;
 807                 }
 808         }
 809
 810         qdio_stop_polling(q);
 811         /*
 812          * We need to check again to not lose initiative after
 813          * resetting the ACK state.
 814          */
 815         if (!qdio_inbound_q_done(q)) {
 816                 qperf_inc(q, tasklet_inbound_resched2);
 817                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 818                         tasklet_schedule(&q->tasklet);
 819         }
 820 }
 821
 822 void tiqdio_inbound_processing(unsigned long data)
 823 {
 824         struct qdio_q *q = (struct qdio_q *)data;
 825         __tiqdio_inbound_processing(q);
 826 }
 827
 828 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 829                                   enum qdio_irq_states state)
 830 {
 831         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 832
 833         irq_ptr->state = state;
 834         mb();
 835 }
 836
 837 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 838 {
 839         if (irb->esw.esw0.erw.cons) {
 840                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 841                 DBF_ERROR_HEX(irb, 64);
 842                 DBF_ERROR_HEX(irb->ecw, 64);
 843         }
 844 }
 845
 846 /* PCI interrupt handler */
 847 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 848 {
 849         int i;
 850         struct qdio_q *q;
 851
 852         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 853                 return;
 854
 855         for_each_input_queue(irq_ptr, q, i)
 856                 tasklet_schedule(&q->tasklet);
 857
 858         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 859                 return;
 860
 861         for_each_output_queue(irq_ptr, q, i) {
 862                 if (qdio_outbound_q_done(q))
 863                         continue;
 864
 865                 if (!siga_syncs_out_pci(q))
 866                         qdio_siga_sync_q(q);
 867
 868                 tasklet_schedule(&q->tasklet);
 869         }
 870 }
 871
 872 static void qdio_handle_activate_check(struct ccw_device *cdev,
 873                                 unsigned long intparm, int cstat, int dstat)
 874 {
 875         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 876         struct qdio_q *q;
 877
 878         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 879         DBF_ERROR("intp :%lx", intparm);
 880         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 881
 882         if (irq_ptr->nr_input_qs) {
 883                 q = irq_ptr->input_qs[0];
 884         } else if (irq_ptr->nr_output_qs) {
 885                 q = irq_ptr->output_qs[0];
 886         } else {
 887                 dump_stack();
 888                 goto no_handler;
 889         }
 890         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 891                    0, -1, -1, irq_ptr->int_parm);
 892 no_handler:
 893         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 894 }
 895
 896 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 897                                       int dstat)
 898 {
 899         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 900
 901         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 902
 903         if (cstat)
 904                 goto error;
 905         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 906                 goto error;
 907         if (!(dstat & DEV_STAT_DEV_END))
 908                 goto error;
 909         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 910         return;
 911
 912 error:
 913         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 914         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 915         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 916 }
 917
 918 /* qdio interrupt handler */
 919 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 920                       struct irb *irb)
 921 {
 922         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 923         int cstat, dstat;
 924
 925         if (!intparm || !irq_ptr) {
 926                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 927                 return;
 928         }
 929
 930         if (IS_ERR(irb)) {
 931                 switch (PTR_ERR(irb)) {
 932                 case -EIO:
 933                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 934                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 935                         wake_up(&cdev->private->wait_q);
 936                         return;
 937                 default:
 938                         WARN_ON(1);
 939                         return;
 940                 }
 941         }
 942         qdio_irq_check_sense(irq_ptr, irb);
 943         cstat = irb->scsw.cmd.cstat;
 944         dstat = irb->scsw.cmd.dstat;
 945
 946         switch (irq_ptr->state) {
 947         case QDIO_IRQ_STATE_INACTIVE:
 948                 qdio_establish_handle_irq(cdev, cstat, dstat);
 949                 break;
 950         case QDIO_IRQ_STATE_CLEANUP:
 951                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 952                 break;
 953         case QDIO_IRQ_STATE_ESTABLISHED:
 954         case QDIO_IRQ_STATE_ACTIVE:
 955                 if (cstat & SCHN_STAT_PCI) {
 956                         qdio_int_handler_pci(irq_ptr);
 957                         return;
 958                 }
 959                 if (cstat || dstat)
 960                         qdio_handle_activate_check(cdev, intparm, cstat,
 961                                                    dstat);
 962                 break;
 963         case QDIO_IRQ_STATE_STOPPED:
 964                 break;
 965         default:
 966                 WARN_ON(1);
 967         }
 968         wake_up(&cdev->private->wait_q);
 969 }
 970
 971 /**
 972  * qdio_get_ssqd_desc - get qdio subchannel description
 973  * @cdev: ccw device to get description for
 974  * @data: where to store the ssqd
 975  *
 976  * Returns 0 or an error code. The results of the chsc are stored in the
 977  * specified structure.
 978  */
 979 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 980                        struct qdio_ssqd_desc *data)
 981 {
 982
 983         if (!cdev || !cdev->private)
 984                 return -EINVAL;
 985
 986         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
 987         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
 988 }
 989 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 990
 991 /**
 992  * qdio_cleanup - shutdown queues and free data structures
 993  * @cdev: associated ccw device
 994  * @how: use halt or clear to shutdown
 995  *
 996  * This function calls qdio_shutdown() for @cdev with method @how.
 997  * and qdio_free(). The qdio_free() return value is ignored since
 998  * !irq_ptr is already checked.
 999  */
1000 int qdio_cleanup(struct ccw_device *cdev, int how)
1001 {
1002         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1003         int rc;
1004
1005         if (!irq_ptr)
1006                 return -ENODEV;
1007
1008         rc = qdio_shutdown(cdev, how);
1009
1010         qdio_free(cdev);
1011         return rc;
1012 }
1013 EXPORT_SYMBOL_GPL(qdio_cleanup);
1014
1015 static void qdio_shutdown_queues(struct ccw_device *cdev)
1016 {
1017         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1018         struct qdio_q *q;
1019         int i;
1020
1021         for_each_input_queue(irq_ptr, q, i)
1022                 tasklet_kill(&q->tasklet);
1023
1024         for_each_output_queue(irq_ptr, q, i) {
1025                 del_timer(&q->u.out.timer);
1026                 tasklet_kill(&q->tasklet);
1027         }
1028 }
1029
1030 /**
1031  * qdio_shutdown - shut down a qdio subchannel
1032  * @cdev: associated ccw device
1033  * @how: use halt or clear to shutdown
1034  */
1035 int qdio_shutdown(struct ccw_device *cdev, int how)
1036 {
1037         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1038         int rc;
1039         unsigned long flags;
1040
1041         if (!irq_ptr)
1042                 return -ENODEV;
1043
1044         BUG_ON(irqs_disabled());
1045         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1046
1047         mutex_lock(&irq_ptr->setup_mutex);
1048         /*
1049          * Subchannel was already shot down. We cannot prevent being called
1050          * twice since cio may trigger a shutdown asynchronously.
1051          */
1052         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1053                 mutex_unlock(&irq_ptr->setup_mutex);
1054                 return 0;
1055         }
1056
1057         /*
1058          * Indicate that the device is going down. Scheduling the queue
1059          * tasklets is forbidden from here on.
1060          */
1061         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1062
1063         tiqdio_remove_input_queues(irq_ptr);
1064         qdio_shutdown_queues(cdev);
1065         qdio_shutdown_debug_entries(irq_ptr, cdev);
1066
1067         /* cleanup subchannel */
1068         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1069
1070         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1071                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1072         else
1073                 /* default behaviour is halt */
1074                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1075         if (rc) {
1076                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1077                 DBF_ERROR("rc:%4d", rc);
1078                 goto no_cleanup;
1079         }
1080
1081         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1082         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1083         wait_event_interruptible_timeout(cdev->private->wait_q,
1084                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1085                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1086                 10 * HZ);
1087         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1088
1089 no_cleanup:
1090         qdio_shutdown_thinint(irq_ptr);
1091
1092         /* restore interrupt handler */
1093         if ((void *)cdev->handler == (void *)qdio_int_handler)
1094                 cdev->handler = irq_ptr->orig_handler;
1095         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1096
1097         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1098         mutex_unlock(&irq_ptr->setup_mutex);
1099         if (rc)
1100                 return rc;
1101         return 0;
1102 }
1103 EXPORT_SYMBOL_GPL(qdio_shutdown);
1104
1105 /**
1106  * qdio_free - free data structures for a qdio subchannel
1107  * @cdev: associated ccw device
1108  */
1109 int qdio_free(struct ccw_device *cdev)
1110 {
1111         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1112
1113         if (!irq_ptr)
1114                 return -ENODEV;
1115
1116         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1117         mutex_lock(&irq_ptr->setup_mutex);
1118
1119         if (irq_ptr->debug_area != NULL) {
1120                 debug_unregister(irq_ptr->debug_area);
1121                 irq_ptr->debug_area = NULL;
1122         }
1123         cdev->private->qdio_data = NULL;
1124         mutex_unlock(&irq_ptr->setup_mutex);
1125
1126         qdio_release_memory(irq_ptr);
1127         return 0;
1128 }
1129 EXPORT_SYMBOL_GPL(qdio_free);
1130
1131 /**
1132  * qdio_initialize - allocate and establish queues for a qdio subchannel
1133  * @init_data: initialization data
1134  *
1135  * This function first allocates queues via qdio_allocate() and on success
1136  * establishes them via qdio_establish().
1137  */
1138 int qdio_initialize(struct qdio_initialize *init_data)
1139 {
1140         int rc;
1141
1142         rc = qdio_allocate(init_data);
1143         if (rc)
1144                 return rc;
1145
1146         rc = qdio_establish(init_data);
1147         if (rc)
1148                 qdio_free(init_data->cdev);
1149         return rc;
1150 }
1151 EXPORT_SYMBOL_GPL(qdio_initialize);
1152
1153 /**
1154  * qdio_allocate - allocate qdio queues and associated data
1155  * @init_data: initialization data
1156  */
1157 int qdio_allocate(struct qdio_initialize *init_data)
1158 {
1159         struct qdio_irq *irq_ptr;
1160
1161         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1162
1163         if ((init_data->no_input_qs && !init_data->input_handler) ||
1164             (init_data->no_output_qs && !init_data->output_handler))
1165                 return -EINVAL;
1166
1167         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1168             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1169                 return -EINVAL;
1170
1171         if ((!init_data->input_sbal_addr_array) ||
1172             (!init_data->output_sbal_addr_array))
1173                 return -EINVAL;
1174
1175         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1176         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1177         if (!irq_ptr)
1178                 goto out_err;
1179
1180         mutex_init(&irq_ptr->setup_mutex);
1181         qdio_allocate_dbf(init_data, irq_ptr);
1182
1183         /*
1184          * Allocate a page for the chsc calls in qdio_establish.
1185          * Must be pre-allocated since a zfcp recovery will call
1186          * qdio_establish. In case of low memory and swap on a zfcp disk
1187          * we may not be able to allocate memory otherwise.
1188          */
1189         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1190         if (!irq_ptr->chsc_page)
1191                 goto out_rel;
1192
1193         /* qdr is used in ccw1.cda which is u32 */
1194         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1195         if (!irq_ptr->qdr)
1196                 goto out_rel;
1197         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1198
1199         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1200                              init_data->no_output_qs))
1201                 goto out_rel;
1202
1203         init_data->cdev->private->qdio_data = irq_ptr;
1204         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1205         return 0;
1206 out_rel:
1207         qdio_release_memory(irq_ptr);
1208 out_err:
1209         return -ENOMEM;
1210 }
1211 EXPORT_SYMBOL_GPL(qdio_allocate);
1212
1213 /**
1214  * qdio_establish - establish queues on a qdio subchannel
1215  * @init_data: initialization data
1216  */
1217 int qdio_establish(struct qdio_initialize *init_data)
1218 {
1219         struct qdio_irq *irq_ptr;
1220         struct ccw_device *cdev = init_data->cdev;
1221         unsigned long saveflags;
1222         int rc;
1223
1224         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1225
1226         irq_ptr = cdev->private->qdio_data;
1227         if (!irq_ptr)
1228                 return -ENODEV;
1229
1230         if (cdev->private->state != DEV_STATE_ONLINE)
1231                 return -EINVAL;
1232
1233         mutex_lock(&irq_ptr->setup_mutex);
1234         qdio_setup_irq(init_data);
1235
1236         rc = qdio_establish_thinint(irq_ptr);
1237         if (rc) {
1238                 mutex_unlock(&irq_ptr->setup_mutex);
1239                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1240                 return rc;
1241         }
1242
1243         /* establish q */
1244         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1245         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1246         irq_ptr->ccw.count = irq_ptr->equeue.count;
1247         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1248
1249         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1250         ccw_device_set_options_mask(cdev, 0);
1251
1252         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1253         if (rc) {
1254                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1255                 DBF_ERROR("rc:%4x", rc);
1256         }
1257         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1258
1259         if (rc) {
1260                 mutex_unlock(&irq_ptr->setup_mutex);
1261                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1262                 return rc;
1263         }
1264
1265         wait_event_interruptible_timeout(cdev->private->wait_q,
1266                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1267                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1268
1269         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1270                 mutex_unlock(&irq_ptr->setup_mutex);
1271                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1272                 return -EIO;
1273         }
1274
1275         qdio_setup_ssqd_info(irq_ptr);
1276         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1277         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1278
1279         /* qebsm is now setup if available, initialize buffer states */
1280         qdio_init_buf_states(irq_ptr);
1281
1282         mutex_unlock(&irq_ptr->setup_mutex);
1283         qdio_print_subchannel_info(irq_ptr, cdev);
1284         qdio_setup_debug_entries(irq_ptr, cdev);
1285         return 0;
1286 }
1287 EXPORT_SYMBOL_GPL(qdio_establish);
1288
1289 /**
1290  * qdio_activate - activate queues on a qdio subchannel
1291  * @cdev: associated cdev
1292  */
1293 int qdio_activate(struct ccw_device *cdev)
1294 {
1295         struct qdio_irq *irq_ptr;
1296         int rc;
1297         unsigned long saveflags;
1298
1299         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1300
1301         irq_ptr = cdev->private->qdio_data;
1302         if (!irq_ptr)
1303                 return -ENODEV;
1304
1305         if (cdev->private->state != DEV_STATE_ONLINE)
1306                 return -EINVAL;
1307
1308         mutex_lock(&irq_ptr->setup_mutex);
1309         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1310                 rc = -EBUSY;
1311                 goto out;
1312         }
1313
1314         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1315         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1316         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1317         irq_ptr->ccw.cda = 0;
1318
1319         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1320         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1321
1322         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1323                               0, DOIO_DENY_PREFETCH);
1324         if (rc) {
1325                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1326                 DBF_ERROR("rc:%4x", rc);
1327         }
1328         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1329
1330         if (rc)
1331                 goto out;
1332
1333         if (is_thinint_irq(irq_ptr))
1334                 tiqdio_add_input_queues(irq_ptr);
1335
1336         /* wait for subchannel to become active */
1337         msleep(5);
1338
1339         switch (irq_ptr->state) {
1340         case QDIO_IRQ_STATE_STOPPED:
1341         case QDIO_IRQ_STATE_ERR:
1342                 rc = -EIO;
1343                 break;
1344         default:
1345                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1346                 rc = 0;
1347         }
1348 out:
1349         mutex_unlock(&irq_ptr->setup_mutex);
1350         return rc;
1351 }
1352 EXPORT_SYMBOL_GPL(qdio_activate);
1353
1354 static inline int buf_in_between(int bufnr, int start, int count)
1355 {
1356         int end = add_buf(start, count);
1357
1358         if (end > start) {
1359                 if (bufnr >= start && bufnr < end)
1360                         return 1;
1361                 else
1362                         return 0;
1363         }
1364
1365         /* wrap-around case */
1366         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1367             (bufnr < end))
1368                 return 1;
1369         else
1370                 return 0;
1371 }
1372
1373 /**
1374  * handle_inbound - reset processed input buffers
1375  * @q: queue containing the buffers
1376  * @callflags: flags
1377  * @bufnr: first buffer to process
1378  * @count: how many buffers are emptied
1379  */
1380 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1381                           int bufnr, int count)
1382 {
1383         int used, diff;
1384
1385         qperf_inc(q, inbound_call);
1386
1387         if (!q->u.in.polling)
1388                 goto set;
1389
1390         /* protect against stop polling setting an ACK for an emptied slsb */
1391         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1392                 /* overwriting everything, just delete polling status */
1393                 q->u.in.polling = 0;
1394                 q->u.in.ack_count = 0;
1395                 goto set;
1396         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1397                 if (is_qebsm(q)) {
1398                         /* partial overwrite, just update ack_start */
1399                         diff = add_buf(bufnr, count);
1400                         diff = sub_buf(diff, q->u.in.ack_start);
1401                         q->u.in.ack_count -= diff;
1402                         if (q->u.in.ack_count <= 0) {
1403                                 q->u.in.polling = 0;
1404                                 q->u.in.ack_count = 0;
1405                                 goto set;
1406                         }
1407                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1408                 }
1409                 else
1410                         /* the only ACK will be deleted, so stop polling */
1411                         q->u.in.polling = 0;
1412         }
1413
1414 set:
1415         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1416
1417         used = atomic_add_return(count, &q->nr_buf_used) - count;
1418         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1419
1420         /* no need to signal as long as the adapter had free buffers */
1421         if (used)
1422                 return 0;
1423
1424         if (need_siga_in(q))
1425                 return qdio_siga_input(q);
1426         return 0;
1427 }
1428
1429 /**
1430  * handle_outbound - process filled outbound buffers
1431  * @q: queue containing the buffers
1432  * @callflags: flags
1433  * @bufnr: first buffer to process
1434  * @count: how many buffers are filled
1435  */
1436 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1437                            int bufnr, int count)
1438 {
1439         unsigned char state;
1440         int used, rc = 0;
1441
1442         qperf_inc(q, outbound_call);
1443
1444         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1445         used = atomic_add_return(count, &q->nr_buf_used);
1446         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1447
1448         if (callflags & QDIO_FLAG_PCI_OUT) {
1449                 q->u.out.pci_out_enabled = 1;
1450                 qperf_inc(q, pci_request_int);
1451         }
1452         else
1453                 q->u.out.pci_out_enabled = 0;
1454
1455         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1456                 if (multicast_outbound(q))
1457                         rc = qdio_kick_outbound_q(q);
1458                 else
1459                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1460                             (count > 1) &&
1461                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1462                                 /* exploit enhanced SIGA */
1463                                 q->u.out.use_enh_siga = 1;
1464                                 rc = qdio_kick_outbound_q(q);
1465                         } else {
1466                                 /*
1467                                 * One siga-w per buffer required for unicast
1468                                 * HiperSockets.
1469                                 */
1470                                 q->u.out.use_enh_siga = 0;
1471                                 while (count--) {
1472                                         rc = qdio_kick_outbound_q(q);
1473                                         if (rc)
1474                                                 goto out;
1475                                 }
1476                         }
1477                 goto out;
1478         }
1479
1480         if (need_siga_sync(q)) {
1481                 qdio_siga_sync_q(q);
1482                 goto out;
1483         }
1484
1485         /* try to fast requeue buffers */
1486         get_buf_state(q, prev_buf(bufnr), &state, 0);
1487         if (state != SLSB_CU_OUTPUT_PRIMED)
1488                 rc = qdio_kick_outbound_q(q);
1489         else
1490                 qperf_inc(q, fast_requeue);
1491
1492 out:
1493         tasklet_schedule(&q->tasklet);
1494         return rc;
1495 }
1496
1497 /**
1498  * do_QDIO - process input or output buffers
1499  * @cdev: associated ccw_device for the qdio subchannel
1500  * @callflags: input or output and special flags from the program
1501  * @q_nr: queue number
1502  * @bufnr: buffer number
1503  * @count: how many buffers to process
1504  */
1505 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1506             int q_nr, unsigned int bufnr, unsigned int count)
1507 {
1508         struct qdio_irq *irq_ptr;
1509
1510         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1511                 return -EINVAL;
1512
1513         irq_ptr = cdev->private->qdio_data;
1514         if (!irq_ptr)
1515                 return -ENODEV;
1516
1517         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1518                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1519
1520         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1521                 return -EBUSY;
1522
1523         if (callflags & QDIO_FLAG_SYNC_INPUT)
1524                 return handle_inbound(irq_ptr->input_qs[q_nr],
1525                                       callflags, bufnr, count);
1526         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1527                 return handle_outbound(irq_ptr->output_qs[q_nr],
1528                                        callflags, bufnr, count);
1529         return -EINVAL;
1530 }
1531 EXPORT_SYMBOL_GPL(do_QDIO);
1532
1533 static int __init init_QDIO(void)
1534 {
1535         int rc;
1536
1537         rc = qdio_setup_init();
1538         if (rc)
1539                 return rc;
1540         rc = tiqdio_allocate_memory();
1541         if (rc)
1542                 goto out_cache;
1543         rc = qdio_debug_init();
1544         if (rc)
1545                 goto out_ti;
1546         rc = tiqdio_register_thinints();
1547         if (rc)
1548                 goto out_debug;
1549         return 0;
1550
1551 out_debug:
1552         qdio_debug_exit();
1553 out_ti:
1554         tiqdio_free_memory();
1555 out_cache:
1556         qdio_setup_exit();
1557         return rc;
1558 }
1559
1560 static void __exit exit_QDIO(void)
1561 {
1562         tiqdio_unregister_thinints();
1563         tiqdio_free_memory();
1564         qdio_debug_exit();
1565         qdio_setup_exit();
1566 }
1567
1568 module_init(init_QDIO);
1569 module_exit(exit_QDIO);