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)
 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         default:
 964                 WARN_ON(1);
 965         }
 966         wake_up(&cdev->private->wait_q);
 967 }
 968
 969 /**
 970  * qdio_get_ssqd_desc - get qdio subchannel description
 971  * @cdev: ccw device to get description for
 972  * @data: where to store the ssqd
 973  *
 974  * Returns 0 or an error code. The results of the chsc are stored in the
 975  * specified structure.
 976  */
 977 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 978                        struct qdio_ssqd_desc *data)
 979 {
 980
 981         if (!cdev || !cdev->private)
 982                 return -EINVAL;
 983
 984         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
 985         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
 986 }
 987 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 988
 989 /**
 990  * qdio_cleanup - shutdown queues and free data structures
 991  * @cdev: associated ccw device
 992  * @how: use halt or clear to shutdown
 993  *
 994  * This function calls qdio_shutdown() for @cdev with method @how.
 995  * and qdio_free(). The qdio_free() return value is ignored since
 996  * !irq_ptr is already checked.
 997  */
 998 int qdio_cleanup(struct ccw_device *cdev, int how)
 999 {
1000         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1001         int rc;
1002
1003         if (!irq_ptr)
1004                 return -ENODEV;
1005
1006         rc = qdio_shutdown(cdev, how);
1007
1008         qdio_free(cdev);
1009         return rc;
1010 }
1011 EXPORT_SYMBOL_GPL(qdio_cleanup);
1012
1013 static void qdio_shutdown_queues(struct ccw_device *cdev)
1014 {
1015         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1016         struct qdio_q *q;
1017         int i;
1018
1019         for_each_input_queue(irq_ptr, q, i)
1020                 tasklet_kill(&q->tasklet);
1021
1022         for_each_output_queue(irq_ptr, q, i) {
1023                 del_timer(&q->u.out.timer);
1024                 tasklet_kill(&q->tasklet);
1025         }
1026 }
1027
1028 /**
1029  * qdio_shutdown - shut down a qdio subchannel
1030  * @cdev: associated ccw device
1031  * @how: use halt or clear to shutdown
1032  */
1033 int qdio_shutdown(struct ccw_device *cdev, int how)
1034 {
1035         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1036         int rc;
1037         unsigned long flags;
1038
1039         if (!irq_ptr)
1040                 return -ENODEV;
1041
1042         BUG_ON(irqs_disabled());
1043         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1044
1045         mutex_lock(&irq_ptr->setup_mutex);
1046         /*
1047          * Subchannel was already shot down. We cannot prevent being called
1048          * twice since cio may trigger a shutdown asynchronously.
1049          */
1050         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1051                 mutex_unlock(&irq_ptr->setup_mutex);
1052                 return 0;
1053         }
1054
1055         /*
1056          * Indicate that the device is going down. Scheduling the queue
1057          * tasklets is forbidden from here on.
1058          */
1059         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1060
1061         tiqdio_remove_input_queues(irq_ptr);
1062         qdio_shutdown_queues(cdev);
1063         qdio_shutdown_debug_entries(irq_ptr, cdev);
1064
1065         /* cleanup subchannel */
1066         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1067
1068         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1069                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1070         else
1071                 /* default behaviour is halt */
1072                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1073         if (rc) {
1074                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1075                 DBF_ERROR("rc:%4d", rc);
1076                 goto no_cleanup;
1077         }
1078
1079         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1080         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1081         wait_event_interruptible_timeout(cdev->private->wait_q,
1082                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1083                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1084                 10 * HZ);
1085         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1086
1087 no_cleanup:
1088         qdio_shutdown_thinint(irq_ptr);
1089
1090         /* restore interrupt handler */
1091         if ((void *)cdev->handler == (void *)qdio_int_handler)
1092                 cdev->handler = irq_ptr->orig_handler;
1093         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1094
1095         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1096         mutex_unlock(&irq_ptr->setup_mutex);
1097         if (rc)
1098                 return rc;
1099         return 0;
1100 }
1101 EXPORT_SYMBOL_GPL(qdio_shutdown);
1102
1103 /**
1104  * qdio_free - free data structures for a qdio subchannel
1105  * @cdev: associated ccw device
1106  */
1107 int qdio_free(struct ccw_device *cdev)
1108 {
1109         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1110
1111         if (!irq_ptr)
1112                 return -ENODEV;
1113
1114         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1115         mutex_lock(&irq_ptr->setup_mutex);
1116
1117         if (irq_ptr->debug_area != NULL) {
1118                 debug_unregister(irq_ptr->debug_area);
1119                 irq_ptr->debug_area = NULL;
1120         }
1121         cdev->private->qdio_data = NULL;
1122         mutex_unlock(&irq_ptr->setup_mutex);
1123
1124         qdio_release_memory(irq_ptr);
1125         return 0;
1126 }
1127 EXPORT_SYMBOL_GPL(qdio_free);
1128
1129 /**
1130  * qdio_initialize - allocate and establish queues for a qdio subchannel
1131  * @init_data: initialization data
1132  *
1133  * This function first allocates queues via qdio_allocate() and on success
1134  * establishes them via qdio_establish().
1135  */
1136 int qdio_initialize(struct qdio_initialize *init_data)
1137 {
1138         int rc;
1139
1140         rc = qdio_allocate(init_data);
1141         if (rc)
1142                 return rc;
1143
1144         rc = qdio_establish(init_data);
1145         if (rc)
1146                 qdio_free(init_data->cdev);
1147         return rc;
1148 }
1149 EXPORT_SYMBOL_GPL(qdio_initialize);
1150
1151 /**
1152  * qdio_allocate - allocate qdio queues and associated data
1153  * @init_data: initialization data
1154  */
1155 int qdio_allocate(struct qdio_initialize *init_data)
1156 {
1157         struct qdio_irq *irq_ptr;
1158
1159         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1160
1161         if ((init_data->no_input_qs && !init_data->input_handler) ||
1162             (init_data->no_output_qs && !init_data->output_handler))
1163                 return -EINVAL;
1164
1165         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1166             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1167                 return -EINVAL;
1168
1169         if ((!init_data->input_sbal_addr_array) ||
1170             (!init_data->output_sbal_addr_array))
1171                 return -EINVAL;
1172
1173         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1174         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1175         if (!irq_ptr)
1176                 goto out_err;
1177
1178         mutex_init(&irq_ptr->setup_mutex);
1179         qdio_allocate_dbf(init_data, irq_ptr);
1180
1181         /*
1182          * Allocate a page for the chsc calls in qdio_establish.
1183          * Must be pre-allocated since a zfcp recovery will call
1184          * qdio_establish. In case of low memory and swap on a zfcp disk
1185          * we may not be able to allocate memory otherwise.
1186          */
1187         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1188         if (!irq_ptr->chsc_page)
1189                 goto out_rel;
1190
1191         /* qdr is used in ccw1.cda which is u32 */
1192         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1193         if (!irq_ptr->qdr)
1194                 goto out_rel;
1195         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1196
1197         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1198                              init_data->no_output_qs))
1199                 goto out_rel;
1200
1201         init_data->cdev->private->qdio_data = irq_ptr;
1202         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1203         return 0;
1204 out_rel:
1205         qdio_release_memory(irq_ptr);
1206 out_err:
1207         return -ENOMEM;
1208 }
1209 EXPORT_SYMBOL_GPL(qdio_allocate);
1210
1211 /**
1212  * qdio_establish - establish queues on a qdio subchannel
1213  * @init_data: initialization data
1214  */
1215 int qdio_establish(struct qdio_initialize *init_data)
1216 {
1217         struct qdio_irq *irq_ptr;
1218         struct ccw_device *cdev = init_data->cdev;
1219         unsigned long saveflags;
1220         int rc;
1221
1222         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1223
1224         irq_ptr = cdev->private->qdio_data;
1225         if (!irq_ptr)
1226                 return -ENODEV;
1227
1228         if (cdev->private->state != DEV_STATE_ONLINE)
1229                 return -EINVAL;
1230
1231         mutex_lock(&irq_ptr->setup_mutex);
1232         qdio_setup_irq(init_data);
1233
1234         rc = qdio_establish_thinint(irq_ptr);
1235         if (rc) {
1236                 mutex_unlock(&irq_ptr->setup_mutex);
1237                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1238                 return rc;
1239         }
1240
1241         /* establish q */
1242         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1243         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1244         irq_ptr->ccw.count = irq_ptr->equeue.count;
1245         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1246
1247         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1248         ccw_device_set_options_mask(cdev, 0);
1249
1250         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1251         if (rc) {
1252                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1253                 DBF_ERROR("rc:%4x", rc);
1254         }
1255         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1256
1257         if (rc) {
1258                 mutex_unlock(&irq_ptr->setup_mutex);
1259                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1260                 return rc;
1261         }
1262
1263         wait_event_interruptible_timeout(cdev->private->wait_q,
1264                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1265                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1266
1267         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1268                 mutex_unlock(&irq_ptr->setup_mutex);
1269                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1270                 return -EIO;
1271         }
1272
1273         qdio_setup_ssqd_info(irq_ptr);
1274         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1275         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1276
1277         /* qebsm is now setup if available, initialize buffer states */
1278         qdio_init_buf_states(irq_ptr);
1279
1280         mutex_unlock(&irq_ptr->setup_mutex);
1281         qdio_print_subchannel_info(irq_ptr, cdev);
1282         qdio_setup_debug_entries(irq_ptr, cdev);
1283         return 0;
1284 }
1285 EXPORT_SYMBOL_GPL(qdio_establish);
1286
1287 /**
1288  * qdio_activate - activate queues on a qdio subchannel
1289  * @cdev: associated cdev
1290  */
1291 int qdio_activate(struct ccw_device *cdev)
1292 {
1293         struct qdio_irq *irq_ptr;
1294         int rc;
1295         unsigned long saveflags;
1296
1297         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1298
1299         irq_ptr = cdev->private->qdio_data;
1300         if (!irq_ptr)
1301                 return -ENODEV;
1302
1303         if (cdev->private->state != DEV_STATE_ONLINE)
1304                 return -EINVAL;
1305
1306         mutex_lock(&irq_ptr->setup_mutex);
1307         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1308                 rc = -EBUSY;
1309                 goto out;
1310         }
1311
1312         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1313         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1314         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1315         irq_ptr->ccw.cda = 0;
1316
1317         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1318         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1319
1320         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1321                               0, DOIO_DENY_PREFETCH);
1322         if (rc) {
1323                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1324                 DBF_ERROR("rc:%4x", rc);
1325         }
1326         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1327
1328         if (rc)
1329                 goto out;
1330
1331         if (is_thinint_irq(irq_ptr))
1332                 tiqdio_add_input_queues(irq_ptr);
1333
1334         /* wait for subchannel to become active */
1335         msleep(5);
1336
1337         switch (irq_ptr->state) {
1338         case QDIO_IRQ_STATE_STOPPED:
1339         case QDIO_IRQ_STATE_ERR:
1340                 rc = -EIO;
1341                 break;
1342         default:
1343                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1344                 rc = 0;
1345         }
1346 out:
1347         mutex_unlock(&irq_ptr->setup_mutex);
1348         return rc;
1349 }
1350 EXPORT_SYMBOL_GPL(qdio_activate);
1351
1352 static inline int buf_in_between(int bufnr, int start, int count)
1353 {
1354         int end = add_buf(start, count);
1355
1356         if (end > start) {
1357                 if (bufnr >= start && bufnr < end)
1358                         return 1;
1359                 else
1360                         return 0;
1361         }
1362
1363         /* wrap-around case */
1364         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1365             (bufnr < end))
1366                 return 1;
1367         else
1368                 return 0;
1369 }
1370
1371 /**
1372  * handle_inbound - reset processed input buffers
1373  * @q: queue containing the buffers
1374  * @callflags: flags
1375  * @bufnr: first buffer to process
1376  * @count: how many buffers are emptied
1377  */
1378 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1379                           int bufnr, int count)
1380 {
1381         int used, diff;
1382
1383         qperf_inc(q, inbound_call);
1384
1385         if (!q->u.in.polling)
1386                 goto set;
1387
1388         /* protect against stop polling setting an ACK for an emptied slsb */
1389         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1390                 /* overwriting everything, just delete polling status */
1391                 q->u.in.polling = 0;
1392                 q->u.in.ack_count = 0;
1393                 goto set;
1394         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1395                 if (is_qebsm(q)) {
1396                         /* partial overwrite, just update ack_start */
1397                         diff = add_buf(bufnr, count);
1398                         diff = sub_buf(diff, q->u.in.ack_start);
1399                         q->u.in.ack_count -= diff;
1400                         if (q->u.in.ack_count <= 0) {
1401                                 q->u.in.polling = 0;
1402                                 q->u.in.ack_count = 0;
1403                                 goto set;
1404                         }
1405                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1406                 }
1407                 else
1408                         /* the only ACK will be deleted, so stop polling */
1409                         q->u.in.polling = 0;
1410         }
1411
1412 set:
1413         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1414
1415         used = atomic_add_return(count, &q->nr_buf_used) - count;
1416         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1417
1418         /* no need to signal as long as the adapter had free buffers */
1419         if (used)
1420                 return 0;
1421
1422         if (need_siga_in(q))
1423                 return qdio_siga_input(q);
1424         return 0;
1425 }
1426
1427 /**
1428  * handle_outbound - process filled outbound buffers
1429  * @q: queue containing the buffers
1430  * @callflags: flags
1431  * @bufnr: first buffer to process
1432  * @count: how many buffers are filled
1433  */
1434 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1435                            int bufnr, int count)
1436 {
1437         unsigned char state;
1438         int used, rc = 0;
1439
1440         qperf_inc(q, outbound_call);
1441
1442         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1443         used = atomic_add_return(count, &q->nr_buf_used);
1444         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1445
1446         if (callflags & QDIO_FLAG_PCI_OUT) {
1447                 q->u.out.pci_out_enabled = 1;
1448                 qperf_inc(q, pci_request_int);
1449         }
1450         else
1451                 q->u.out.pci_out_enabled = 0;
1452
1453         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1454                 if (multicast_outbound(q))
1455                         rc = qdio_kick_outbound_q(q);
1456                 else
1457                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1458                             (count > 1) &&
1459                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1460                                 /* exploit enhanced SIGA */
1461                                 q->u.out.use_enh_siga = 1;
1462                                 rc = qdio_kick_outbound_q(q);
1463                         } else {
1464                                 /*
1465                                 * One siga-w per buffer required for unicast
1466                                 * HiperSockets.
1467                                 */
1468                                 q->u.out.use_enh_siga = 0;
1469                                 while (count--) {
1470                                         rc = qdio_kick_outbound_q(q);
1471                                         if (rc)
1472                                                 goto out;
1473                                 }
1474                         }
1475                 goto out;
1476         }
1477
1478         if (need_siga_sync(q)) {
1479                 qdio_siga_sync_q(q);
1480                 goto out;
1481         }
1482
1483         /* try to fast requeue buffers */
1484         get_buf_state(q, prev_buf(bufnr), &state, 0);
1485         if (state != SLSB_CU_OUTPUT_PRIMED)
1486                 rc = qdio_kick_outbound_q(q);
1487         else
1488                 qperf_inc(q, fast_requeue);
1489
1490 out:
1491         tasklet_schedule(&q->tasklet);
1492         return rc;
1493 }
1494
1495 /**
1496  * do_QDIO - process input or output buffers
1497  * @cdev: associated ccw_device for the qdio subchannel
1498  * @callflags: input or output and special flags from the program
1499  * @q_nr: queue number
1500  * @bufnr: buffer number
1501  * @count: how many buffers to process
1502  */
1503 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1504             int q_nr, unsigned int bufnr, unsigned int count)
1505 {
1506         struct qdio_irq *irq_ptr;
1507
1508         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1509                 return -EINVAL;
1510
1511         irq_ptr = cdev->private->qdio_data;
1512         if (!irq_ptr)
1513                 return -ENODEV;
1514
1515         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1516                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1517
1518         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1519                 return -EBUSY;
1520
1521         if (callflags & QDIO_FLAG_SYNC_INPUT)
1522                 return handle_inbound(irq_ptr->input_qs[q_nr],
1523                                       callflags, bufnr, count);
1524         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1525                 return handle_outbound(irq_ptr->output_qs[q_nr],
1526                                        callflags, bufnr, count);
1527         return -EINVAL;
1528 }
1529 EXPORT_SYMBOL_GPL(do_QDIO);
1530
1531 static int __init init_QDIO(void)
1532 {
1533         int rc;
1534
1535         rc = qdio_setup_init();
1536         if (rc)
1537                 return rc;
1538         rc = tiqdio_allocate_memory();
1539         if (rc)
1540                 goto out_cache;
1541         rc = qdio_debug_init();
1542         if (rc)
1543                 goto out_ti;
1544         rc = tiqdio_register_thinints();
1545         if (rc)
1546                 goto out_debug;
1547         return 0;
1548
1549 out_debug:
1550         qdio_debug_exit();
1551 out_ti:
1552         tiqdio_free_memory();
1553 out_cache:
1554         qdio_setup_exit();
1555         return rc;
1556 }
1557
1558 static void __exit exit_QDIO(void)
1559 {
1560         tiqdio_unregister_thinints();
1561         tiqdio_free_memory();
1562         qdio_debug_exit();
1563         qdio_setup_exit();
1564 }
1565
1566 module_init(init_QDIO);
1567 module_exit(exit_QDIO);