drivers/s390/cio/qdio_main.c

   1 /*
   2  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   3  *
   4  * Copyright IBM Corp. 2000, 2008
   5  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   6  *            Jan Glauber <jang@linux.vnet.ibm.com>
   7  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   8  */
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/timer.h>
  13 #include <linux/delay.h>
  14 #include <linux/gfp.h>
  15 #include <linux/io.h>
  16 #include <linux/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19 #include <asm/ipl.h>
  20
  21 #include "cio.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "qdio.h"
  25 #include "qdio_debug.h"
  26
  27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  28         "Jan Glauber <jang@linux.vnet.ibm.com>");
  29 MODULE_DESCRIPTION("QDIO base support");
  30 MODULE_LICENSE("GPL");
  31
  32 static inline int do_siga_sync(unsigned long schid,
  33                                unsigned int out_mask, unsigned int in_mask,
  34                                unsigned int fc)
  35 {
  36         register unsigned long __fc asm ("0") = fc;
  37         register unsigned long __schid asm ("1") = schid;
  38         register unsigned long out asm ("2") = out_mask;
  39         register unsigned long in asm ("3") = in_mask;
  40         int cc;
  41
  42         asm volatile(
  43                 "       siga    0\n"
  44                 "       ipm     %0\n"
  45                 "       srl     %0,28\n"
  46                 : "=d" (cc)
  47                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  48         return cc;
  49 }
  50
  51 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  52                                 unsigned int fc)
  53 {
  54         register unsigned long __fc asm ("0") = fc;
  55         register unsigned long __schid asm ("1") = schid;
  56         register unsigned long __mask asm ("2") = mask;
  57         int cc;
  58
  59         asm volatile(
  60                 "       siga    0\n"
  61                 "       ipm     %0\n"
  62                 "       srl     %0,28\n"
  63                 : "=d" (cc)
  64                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  65         return cc;
  66 }
  67
  68 /**
  69  * do_siga_output - perform SIGA-w/wt function
  70  * @schid: subchannel id or in case of QEBSM the subchannel token
  71  * @mask: which output queues to process
  72  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  73  * @fc: function code to perform
  74  *
  75  * Returns condition code.
  76  * Note: For IQDC unicast queues only the highest priority queue is processed.
  77  */
  78 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  79                                  unsigned int *bb, unsigned int fc,
  80                                  unsigned long aob)
  81 {
  82         register unsigned long __fc asm("0") = fc;
  83         register unsigned long __schid asm("1") = schid;
  84         register unsigned long __mask asm("2") = mask;
  85         register unsigned long __aob asm("3") = aob;
  86         int cc;
  87
  88         asm volatile(
  89                 "       siga    0\n"
  90                 "       ipm     %0\n"
  91                 "       srl     %0,28\n"
  92                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  93                 : "d" (__schid), "d" (__mask)
  94                 : "cc");
  95         *bb = __fc >> 31;
  96         return cc;
  97 }
  98
  99 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
 100 {
 101         /* all done or next buffer state different */
 102         if (ccq == 0 || ccq == 32)
 103                 return 0;
 104         /* no buffer processed */
 105         if (ccq == 97)
 106                 return 1;
 107         /* not all buffers processed */
 108         if (ccq == 96)
 109                 return 2;
 110         /* notify devices immediately */
 111         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 112         return -EIO;
 113 }
 114
 115 /**
 116  * qdio_do_eqbs - extract buffer states for QEBSM
 117  * @q: queue to manipulate
 118  * @state: state of the extracted buffers
 119  * @start: buffer number to start at
 120  * @count: count of buffers to examine
 121  * @auto_ack: automatically acknowledge buffers
 122  *
 123  * Returns the number of successfully extracted equal buffer states.
 124  * Stops processing if a state is different from the last buffers state.
 125  */
 126 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 127                         int start, int count, int auto_ack)
 128 {
 129         int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
 130         unsigned int ccq = 0;
 131
 132         BUG_ON(!q->irq_ptr->sch_token);
 133         qperf_inc(q, eqbs);
 134
 135         if (!q->is_input_q)
 136                 nr += q->irq_ptr->nr_input_qs;
 137 again:
 138         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 139                       auto_ack);
 140         rc = qdio_check_ccq(q, ccq);
 141         if (!rc)
 142                 return count - tmp_count;
 143
 144         if (rc == 1) {
 145                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 146                 goto again;
 147         }
 148
 149         if (rc == 2) {
 150                 BUG_ON(tmp_count == count);
 151                 qperf_inc(q, eqbs_partial);
 152                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
 153                         tmp_count);
 154                 /*
 155                  * Retry once, if that fails bail out and process the
 156                  * extracted buffers before trying again.
 157                  */
 158                 if (!retried++)
 159                         goto again;
 160                 else
 161                         return count - tmp_count;
 162         }
 163
 164         DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 165         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 166         q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE,
 167                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 168         return 0;
 169 }
 170
 171 /**
 172  * qdio_do_sqbs - set buffer states for QEBSM
 173  * @q: queue to manipulate
 174  * @state: new state of the buffers
 175  * @start: first buffer number to change
 176  * @count: how many buffers to change
 177  *
 178  * Returns the number of successfully changed buffers.
 179  * Does retrying until the specified count of buffer states is set or an
 180  * error occurs.
 181  */
 182 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 183                         int count)
 184 {
 185         unsigned int ccq = 0;
 186         int tmp_count = count, tmp_start = start;
 187         int nr = q->nr;
 188         int rc;
 189
 190         if (!count)
 191                 return 0;
 192
 193         BUG_ON(!q->irq_ptr->sch_token);
 194         qperf_inc(q, sqbs);
 195
 196         if (!q->is_input_q)
 197                 nr += q->irq_ptr->nr_input_qs;
 198 again:
 199         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 200         rc = qdio_check_ccq(q, ccq);
 201         if (!rc) {
 202                 WARN_ON(tmp_count);
 203                 return count - tmp_count;
 204         }
 205
 206         if (rc == 1 || rc == 2) {
 207                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 208                 qperf_inc(q, sqbs_partial);
 209                 goto again;
 210         }
 211
 212         DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 213         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 214         q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE,
 215                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 216         return 0;
 217 }
 218
 219 /* returns number of examined buffers and their common state in *state */
 220 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 221                                  unsigned char *state, unsigned int count,
 222                                  int auto_ack, int merge_pending)
 223 {
 224         unsigned char __state = 0;
 225         int i;
 226
 227         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 228         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 229
 230         if (is_qebsm(q))
 231                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 232
 233         for (i = 0; i < count; i++) {
 234                 if (!__state) {
 235                         __state = q->slsb.val[bufnr];
 236                         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 237                                 __state = SLSB_P_OUTPUT_EMPTY;
 238                 } else if (merge_pending) {
 239                         if ((q->slsb.val[bufnr] & __state) != __state)
 240                                 break;
 241                 } else if (q->slsb.val[bufnr] != __state)
 242                         break;
 243                 bufnr = next_buf(bufnr);
 244         }
 245         *state = __state;
 246         return i;
 247 }
 248
 249 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 250                                 unsigned char *state, int auto_ack)
 251 {
 252         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 253 }
 254
 255 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 256 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 257                                  unsigned char state, int count)
 258 {
 259         int i;
 260
 261         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 262         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 263
 264         if (is_qebsm(q))
 265                 return qdio_do_sqbs(q, state, bufnr, count);
 266
 267         for (i = 0; i < count; i++) {
 268                 xchg(&q->slsb.val[bufnr], state);
 269                 bufnr = next_buf(bufnr);
 270         }
 271         return count;
 272 }
 273
 274 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 275                                 unsigned char state)
 276 {
 277         return set_buf_states(q, bufnr, state, 1);
 278 }
 279
 280 /* set slsb states to initial state */
 281 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 282 {
 283         struct qdio_q *q;
 284         int i;
 285
 286         for_each_input_queue(irq_ptr, q, i)
 287                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 288                                QDIO_MAX_BUFFERS_PER_Q);
 289         for_each_output_queue(irq_ptr, q, i)
 290                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 291                                QDIO_MAX_BUFFERS_PER_Q);
 292 }
 293
 294 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 295                           unsigned int input)
 296 {
 297         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 298         unsigned int fc = QDIO_SIGA_SYNC;
 299         int cc;
 300
 301         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 302         qperf_inc(q, siga_sync);
 303
 304         if (is_qebsm(q)) {
 305                 schid = q->irq_ptr->sch_token;
 306                 fc |= QDIO_SIGA_QEBSM_FLAG;
 307         }
 308
 309         cc = do_siga_sync(schid, output, input, fc);
 310         if (unlikely(cc))
 311                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 312         return (cc) ? -EIO : 0;
 313 }
 314
 315 static inline int qdio_siga_sync_q(struct qdio_q *q)
 316 {
 317         if (q->is_input_q)
 318                 return qdio_siga_sync(q, 0, q->mask);
 319         else
 320                 return qdio_siga_sync(q, q->mask, 0);
 321 }
 322
 323 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
 324         unsigned long aob)
 325 {
 326         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 327         unsigned int fc = QDIO_SIGA_WRITE;
 328         u64 start_time = 0;
 329         int retries = 0, cc;
 330         unsigned long laob = 0;
 331
 332         if (q->u.out.use_cq && aob != 0) {
 333                 fc = QDIO_SIGA_WRITEQ;
 334                 laob = aob;
 335         }
 336
 337         if (is_qebsm(q)) {
 338                 schid = q->irq_ptr->sch_token;
 339                 fc |= QDIO_SIGA_QEBSM_FLAG;
 340         }
 341 again:
 342         WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
 343                 (aob && fc != QDIO_SIGA_WRITEQ));
 344         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
 345
 346         /* hipersocket busy condition */
 347         if (unlikely(*busy_bit)) {
 348                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 349                 retries++;
 350
 351                 if (!start_time) {
 352                         start_time = get_clock();
 353                         goto again;
 354                 }
 355                 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 356                         goto again;
 357         }
 358         if (retries) {
 359                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 360                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 361                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 362         }
 363         return cc;
 364 }
 365
 366 static inline int qdio_siga_input(struct qdio_q *q)
 367 {
 368         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 369         unsigned int fc = QDIO_SIGA_READ;
 370         int cc;
 371
 372         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 373         qperf_inc(q, siga_read);
 374
 375         if (is_qebsm(q)) {
 376                 schid = q->irq_ptr->sch_token;
 377                 fc |= QDIO_SIGA_QEBSM_FLAG;
 378         }
 379
 380         cc = do_siga_input(schid, q->mask, fc);
 381         if (unlikely(cc))
 382                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 383         return (cc) ? -EIO : 0;
 384 }
 385
 386 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 387 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 388
 389 static inline void qdio_sync_queues(struct qdio_q *q)
 390 {
 391         /* PCI capable outbound queues will also be scanned so sync them too */
 392         if (pci_out_supported(q))
 393                 qdio_siga_sync_all(q);
 394         else
 395                 qdio_siga_sync_q(q);
 396 }
 397
 398 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 399                         unsigned char *state)
 400 {
 401         if (need_siga_sync(q))
 402                 qdio_siga_sync_q(q);
 403         return get_buf_states(q, bufnr, state, 1, 0, 0);
 404 }
 405
 406 static inline void qdio_stop_polling(struct qdio_q *q)
 407 {
 408         if (!q->u.in.polling)
 409                 return;
 410
 411         q->u.in.polling = 0;
 412         qperf_inc(q, stop_polling);
 413
 414         /* show the card that we are not polling anymore */
 415         if (is_qebsm(q)) {
 416                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 417                                q->u.in.ack_count);
 418                 q->u.in.ack_count = 0;
 419         } else
 420                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 421 }
 422
 423 static inline void account_sbals(struct qdio_q *q, int count)
 424 {
 425         int pos = 0;
 426
 427         q->q_stats.nr_sbal_total += count;
 428         if (count == QDIO_MAX_BUFFERS_MASK) {
 429                 q->q_stats.nr_sbals[7]++;
 430                 return;
 431         }
 432         while (count >>= 1)
 433                 pos++;
 434         q->q_stats.nr_sbals[pos]++;
 435 }
 436
 437 static void process_buffer_error(struct qdio_q *q, int count)
 438 {
 439         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 440                                         SLSB_P_OUTPUT_NOT_INIT;
 441
 442         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 443
 444         /* special handling for no target buffer empty */
 445         if ((!q->is_input_q &&
 446             (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
 447                 qperf_inc(q, target_full);
 448                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 449                               q->first_to_check);
 450                 goto set;
 451         }
 452
 453         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 454         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 455         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 456         DBF_ERROR("F14:%2x F15:%2x",
 457                   q->sbal[q->first_to_check]->element[14].sflags,
 458                   q->sbal[q->first_to_check]->element[15].sflags);
 459
 460 set:
 461         /*
 462          * Interrupts may be avoided as long as the error is present
 463          * so change the buffer state immediately to avoid starvation.
 464          */
 465         set_buf_states(q, q->first_to_check, state, count);
 466 }
 467
 468 static inline void inbound_primed(struct qdio_q *q, int count)
 469 {
 470         int new;
 471
 472         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 473
 474         /* for QEBSM the ACK was already set by EQBS */
 475         if (is_qebsm(q)) {
 476                 if (!q->u.in.polling) {
 477                         q->u.in.polling = 1;
 478                         q->u.in.ack_count = count;
 479                         q->u.in.ack_start = q->first_to_check;
 480                         return;
 481                 }
 482
 483                 /* delete the previous ACK's */
 484                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 485                                q->u.in.ack_count);
 486                 q->u.in.ack_count = count;
 487                 q->u.in.ack_start = q->first_to_check;
 488                 return;
 489         }
 490
 491         /*
 492          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 493          * or by the next inbound run.
 494          */
 495         new = add_buf(q->first_to_check, count - 1);
 496         if (q->u.in.polling) {
 497                 /* reset the previous ACK but first set the new one */
 498                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 499                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 500         } else {
 501                 q->u.in.polling = 1;
 502                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 503         }
 504
 505         q->u.in.ack_start = new;
 506         count--;
 507         if (!count)
 508                 return;
 509         /* need to change ALL buffers to get more interrupts */
 510         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 511 }
 512
 513 static int get_inbound_buffer_frontier(struct qdio_q *q)
 514 {
 515         int count, stop;
 516         unsigned char state = 0;
 517
 518         q->timestamp = get_clock();
 519
 520         /*
 521          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 522          * would return 0.
 523          */
 524         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 525         stop = add_buf(q->first_to_check, count);
 526
 527         if (q->first_to_check == stop)
 528                 goto out;
 529
 530         /*
 531          * No siga sync here, as a PCI or we after a thin interrupt
 532          * already sync'ed the queues.
 533          */
 534         count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
 535         if (!count)
 536                 goto out;
 537
 538         switch (state) {
 539         case SLSB_P_INPUT_PRIMED:
 540                 inbound_primed(q, count);
 541                 q->first_to_check = add_buf(q->first_to_check, count);
 542                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 543                         qperf_inc(q, inbound_queue_full);
 544                 if (q->irq_ptr->perf_stat_enabled)
 545                         account_sbals(q, count);
 546                 break;
 547         case SLSB_P_INPUT_ERROR:
 548                 process_buffer_error(q, count);
 549                 q->first_to_check = add_buf(q->first_to_check, count);
 550                 atomic_sub(count, &q->nr_buf_used);
 551                 if (q->irq_ptr->perf_stat_enabled)
 552                         account_sbals_error(q, count);
 553                 break;
 554         case SLSB_CU_INPUT_EMPTY:
 555         case SLSB_P_INPUT_NOT_INIT:
 556         case SLSB_P_INPUT_ACK:
 557                 if (q->irq_ptr->perf_stat_enabled)
 558                         q->q_stats.nr_sbal_nop++;
 559                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 560                 break;
 561         default:
 562                 BUG();
 563         }
 564 out:
 565         return q->first_to_check;
 566 }
 567
 568 static int qdio_inbound_q_moved(struct qdio_q *q)
 569 {
 570         int bufnr;
 571
 572         bufnr = get_inbound_buffer_frontier(q);
 573
 574         if (bufnr != q->last_move) {
 575                 q->last_move = bufnr;
 576                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 577                         q->u.in.timestamp = get_clock();
 578                 return 1;
 579         } else
 580                 return 0;
 581 }
 582
 583 static inline int qdio_inbound_q_done(struct qdio_q *q)
 584 {
 585         unsigned char state = 0;
 586
 587         if (!atomic_read(&q->nr_buf_used))
 588                 return 1;
 589
 590         if (need_siga_sync(q))
 591                 qdio_siga_sync_q(q);
 592         get_buf_state(q, q->first_to_check, &state, 0);
 593
 594         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 595                 /* more work coming */
 596                 return 0;
 597
 598         if (is_thinint_irq(q->irq_ptr))
 599                 return 1;
 600
 601         /* don't poll under z/VM */
 602         if (MACHINE_IS_VM)
 603                 return 1;
 604
 605         /*
 606          * At this point we know, that inbound first_to_check
 607          * has (probably) not moved (see qdio_inbound_processing).
 608          */
 609         if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 610                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 611                               q->first_to_check);
 612                 return 1;
 613         } else
 614                 return 0;
 615 }
 616
 617 static inline int contains_aobs(struct qdio_q *q)
 618 {
 619         return !q->is_input_q && q->u.out.use_cq;
 620 }
 621
 622 static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
 623                                 int i, struct qaob *aob)
 624 {
 625         int tmp;
 626
 627         DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
 628                         (unsigned long) virt_to_phys(aob));
 629         DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
 630                         (unsigned long) aob->res0[0]);
 631         DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
 632                         (unsigned long) aob->res0[1]);
 633         DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
 634                         (unsigned long) aob->res0[2]);
 635         DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
 636                         (unsigned long) aob->res0[3]);
 637         DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
 638                         (unsigned long) aob->res0[4]);
 639         DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
 640                         (unsigned long) aob->res0[5]);
 641         DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
 642         DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
 643         DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
 644         DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
 645         DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
 646         DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
 647         DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
 648         for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
 649                 DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
 650                                 (unsigned long) aob->sba[tmp]);
 651                 DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
 652                                 (unsigned long) q->sbal[i]->element[tmp].addr);
 653                 DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
 654                 DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
 655                                 q->sbal[i]->element[tmp].length);
 656         }
 657         DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
 658         for (tmp = 0; tmp < 2; ++tmp) {
 659                 DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
 660                         (unsigned long) aob->res4[tmp]);
 661         }
 662         DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
 663         DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
 664 }
 665
 666 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 667 {
 668         unsigned char state = 0;
 669         int j, b = start;
 670
 671         if (!contains_aobs(q))
 672                 return;
 673
 674         for (j = 0; j < count; ++j) {
 675                 get_buf_state(q, b, &state, 0);
 676                 if (state == SLSB_P_OUTPUT_PENDING) {
 677                         struct qaob *aob = q->u.out.aobs[b];
 678                         if (aob == NULL)
 679                                 continue;
 680
 681                         BUG_ON(q->u.out.sbal_state == NULL);
 682                         q->u.out.sbal_state[b].flags |=
 683                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 684                         q->u.out.aobs[b] = NULL;
 685                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
 686                         BUG_ON(q->u.out.sbal_state == NULL);
 687                         q->u.out.sbal_state[b].aob = NULL;
 688                 }
 689                 b = next_buf(b);
 690         }
 691 }
 692
 693 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 694                                         int bufnr)
 695 {
 696         unsigned long phys_aob = 0;
 697
 698         if (!q->use_cq)
 699                 goto out;
 700
 701         if (!q->aobs[bufnr]) {
 702                 struct qaob *aob = qdio_allocate_aob();
 703                 q->aobs[bufnr] = aob;
 704         }
 705         if (q->aobs[bufnr]) {
 706                 BUG_ON(q->sbal_state == NULL);
 707                 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
 708                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
 709                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 710                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 711                 BUG_ON(phys_aob & 0xFF);
 712         }
 713
 714 out:
 715         return phys_aob;
 716 }
 717
 718 static void qdio_kick_handler(struct qdio_q *q)
 719 {
 720         int start = q->first_to_kick;
 721         int end = q->first_to_check;
 722         int count;
 723
 724         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 725                 return;
 726
 727         count = sub_buf(end, start);
 728
 729         if (q->is_input_q) {
 730                 qperf_inc(q, inbound_handler);
 731                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 732         } else {
 733                 qperf_inc(q, outbound_handler);
 734                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 735                               start, count);
 736         }
 737
 738         qdio_handle_aobs(q, start, count);
 739
 740         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 741                    q->irq_ptr->int_parm);
 742
 743         /* for the next time */
 744         q->first_to_kick = end;
 745         q->qdio_error = 0;
 746 }
 747
 748 static void __qdio_inbound_processing(struct qdio_q *q)
 749 {
 750         qperf_inc(q, tasklet_inbound);
 751
 752         if (!qdio_inbound_q_moved(q))
 753                 return;
 754
 755         qdio_kick_handler(q);
 756
 757         if (!qdio_inbound_q_done(q)) {
 758                 /* means poll time is not yet over */
 759                 qperf_inc(q, tasklet_inbound_resched);
 760                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 761                         tasklet_schedule(&q->tasklet);
 762                         return;
 763                 }
 764         }
 765
 766         qdio_stop_polling(q);
 767         /*
 768          * We need to check again to not lose initiative after
 769          * resetting the ACK state.
 770          */
 771         if (!qdio_inbound_q_done(q)) {
 772                 qperf_inc(q, tasklet_inbound_resched2);
 773                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 774                         tasklet_schedule(&q->tasklet);
 775         }
 776 }
 777
 778 void qdio_inbound_processing(unsigned long data)
 779 {
 780         struct qdio_q *q = (struct qdio_q *)data;
 781         __qdio_inbound_processing(q);
 782 }
 783
 784 static int get_outbound_buffer_frontier(struct qdio_q *q)
 785 {
 786         int count, stop;
 787         unsigned char state = 0;
 788
 789         q->timestamp = get_clock();
 790
 791         if (need_siga_sync(q))
 792                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 793                     !pci_out_supported(q)) ||
 794                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 795                     multicast_outbound(q)))
 796                         qdio_siga_sync_q(q);
 797
 798         /*
 799          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 800          * would return 0.
 801          */
 802         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 803         stop = add_buf(q->first_to_check, count);
 804         if (q->first_to_check == stop)
 805                 goto out;
 806
 807         count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
 808         if (!count)
 809                 goto out;
 810
 811         switch (state) {
 812         case SLSB_P_OUTPUT_PENDING:
 813                 BUG();
 814         case SLSB_P_OUTPUT_EMPTY:
 815                 /* the adapter got it */
 816                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 817                         "out empty:%1d %02x", q->nr, count);
 818
 819                 atomic_sub(count, &q->nr_buf_used);
 820                 q->first_to_check = add_buf(q->first_to_check, count);
 821                 if (q->irq_ptr->perf_stat_enabled)
 822                         account_sbals(q, count);
 823
 824                 break;
 825         case SLSB_P_OUTPUT_ERROR:
 826                 process_buffer_error(q, count);
 827                 q->first_to_check = add_buf(q->first_to_check, count);
 828                 atomic_sub(count, &q->nr_buf_used);
 829                 if (q->irq_ptr->perf_stat_enabled)
 830                         account_sbals_error(q, count);
 831                 break;
 832         case SLSB_CU_OUTPUT_PRIMED:
 833                 /* the adapter has not fetched the output yet */
 834                 if (q->irq_ptr->perf_stat_enabled)
 835                         q->q_stats.nr_sbal_nop++;
 836                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 837                               q->nr);
 838                 break;
 839         case SLSB_P_OUTPUT_NOT_INIT:
 840         case SLSB_P_OUTPUT_HALTED:
 841                 break;
 842         default:
 843                 BUG();
 844         }
 845
 846 out:
 847         return q->first_to_check;
 848 }
 849
 850 /* all buffers processed? */
 851 static inline int qdio_outbound_q_done(struct qdio_q *q)
 852 {
 853         return atomic_read(&q->nr_buf_used) == 0;
 854 }
 855
 856 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 857 {
 858         int bufnr;
 859
 860         bufnr = get_outbound_buffer_frontier(q);
 861
 862         if (bufnr != q->last_move) {
 863                 q->last_move = bufnr;
 864                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 865                 return 1;
 866         } else
 867                 return 0;
 868 }
 869
 870 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 871 {
 872         int retries = 0, cc;
 873         unsigned int busy_bit;
 874
 875         if (!need_siga_out(q))
 876                 return 0;
 877
 878         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 879 retry:
 880         qperf_inc(q, siga_write);
 881
 882         cc = qdio_siga_output(q, &busy_bit, aob);
 883         switch (cc) {
 884         case 0:
 885                 break;
 886         case 2:
 887                 if (busy_bit) {
 888                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 889                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 890                                 goto retry;
 891                         }
 892                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 893                         cc = -EBUSY;
 894                 } else {
 895                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 896                         cc = -ENOBUFS;
 897                 }
 898                 break;
 899         case 1:
 900         case 3:
 901                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 902                 cc = -EIO;
 903                 break;
 904         }
 905         if (retries) {
 906                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 907                 DBF_ERROR("count:%u", retries);
 908         }
 909         return cc;
 910 }
 911
 912 static void __qdio_outbound_processing(struct qdio_q *q)
 913 {
 914         qperf_inc(q, tasklet_outbound);
 915         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 916
 917         if (qdio_outbound_q_moved(q))
 918                 qdio_kick_handler(q);
 919
 920         if (queue_type(q) == QDIO_ZFCP_QFMT)
 921                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 922                         goto sched;
 923
 924         if (q->u.out.pci_out_enabled)
 925                 return;
 926
 927         /*
 928          * Now we know that queue type is either qeth without pci enabled
 929          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 930          * is noticed and outbound_handler is called after some time.
 931          */
 932         if (qdio_outbound_q_done(q))
 933                 del_timer(&q->u.out.timer);
 934         else
 935                 if (!timer_pending(&q->u.out.timer))
 936                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 937         return;
 938
 939 sched:
 940         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 941                 return;
 942         tasklet_schedule(&q->tasklet);
 943 }
 944
 945 /* outbound tasklet */
 946 void qdio_outbound_processing(unsigned long data)
 947 {
 948         struct qdio_q *q = (struct qdio_q *)data;
 949         __qdio_outbound_processing(q);
 950 }
 951
 952 void qdio_outbound_timer(unsigned long data)
 953 {
 954         struct qdio_q *q = (struct qdio_q *)data;
 955
 956         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 957                 return;
 958         tasklet_schedule(&q->tasklet);
 959 }
 960
 961 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 962 {
 963         struct qdio_q *out;
 964         int i;
 965
 966         if (!pci_out_supported(q))
 967                 return;
 968
 969         for_each_output_queue(q->irq_ptr, out, i)
 970                 if (!qdio_outbound_q_done(out))
 971                         tasklet_schedule(&out->tasklet);
 972 }
 973
 974 static void __tiqdio_inbound_processing(struct qdio_q *q)
 975 {
 976         qperf_inc(q, tasklet_inbound);
 977         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 978                 qdio_sync_queues(q);
 979
 980         /*
 981          * The interrupt could be caused by a PCI request. Check the
 982          * PCI capable outbound queues.
 983          */
 984         qdio_check_outbound_after_thinint(q);
 985
 986         if (!qdio_inbound_q_moved(q))
 987                 return;
 988
 989         qdio_kick_handler(q);
 990
 991         if (!qdio_inbound_q_done(q)) {
 992                 qperf_inc(q, tasklet_inbound_resched);
 993                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 994                         tasklet_schedule(&q->tasklet);
 995                         return;
 996                 }
 997         }
 998
 999         qdio_stop_polling(q);
1000         /*
1001          * We need to check again to not lose initiative after
1002          * resetting the ACK state.
1003          */
1004         if (!qdio_inbound_q_done(q)) {
1005                 qperf_inc(q, tasklet_inbound_resched2);
1006                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
1007                         tasklet_schedule(&q->tasklet);
1008         }
1009 }
1010
1011 void tiqdio_inbound_processing(unsigned long data)
1012 {
1013         struct qdio_q *q = (struct qdio_q *)data;
1014         __tiqdio_inbound_processing(q);
1015 }
1016
1017 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
1018                                   enum qdio_irq_states state)
1019 {
1020         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
1021
1022         irq_ptr->state = state;
1023         mb();
1024 }
1025
1026 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
1027 {
1028         if (irb->esw.esw0.erw.cons) {
1029                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
1030                 DBF_ERROR_HEX(irb, 64);
1031                 DBF_ERROR_HEX(irb->ecw, 64);
1032         }
1033 }
1034
1035 /* PCI interrupt handler */
1036 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
1037 {
1038         int i;
1039         struct qdio_q *q;
1040
1041         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
1042                 return;
1043
1044         for_each_input_queue(irq_ptr, q, i) {
1045                 if (q->u.in.queue_start_poll) {
1046                         /* skip if polling is enabled or already in work */
1047                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1048                                      &q->u.in.queue_irq_state)) {
1049                                 qperf_inc(q, int_discarded);
1050                                 continue;
1051                         }
1052                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
1053                                                  q->irq_ptr->int_parm);
1054                 } else {
1055                         tasklet_schedule(&q->tasklet);
1056                 }
1057         }
1058
1059         if (!pci_out_supported(q))
1060                 return;
1061
1062         for_each_output_queue(irq_ptr, q, i) {
1063                 if (qdio_outbound_q_done(q))
1064                         continue;
1065                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1066                         qdio_siga_sync_q(q);
1067                 tasklet_schedule(&q->tasklet);
1068         }
1069 }
1070
1071 static void qdio_handle_activate_check(struct ccw_device *cdev,
1072                                 unsigned long intparm, int cstat, int dstat)
1073 {
1074         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1075         struct qdio_q *q;
1076         int count;
1077
1078         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1079         DBF_ERROR("intp :%lx", intparm);
1080         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1081
1082         if (irq_ptr->nr_input_qs) {
1083                 q = irq_ptr->input_qs[0];
1084         } else if (irq_ptr->nr_output_qs) {
1085                 q = irq_ptr->output_qs[0];
1086         } else {
1087                 dump_stack();
1088                 goto no_handler;
1089         }
1090
1091         count = sub_buf(q->first_to_check, q->first_to_kick);
1092         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1093                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1094 no_handler:
1095         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1096         /*
1097          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1098          * Therefore we call the LGR detection function here.
1099          */
1100         lgr_info_log();
1101 }
1102
1103 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1104                                       int dstat)
1105 {
1106         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1107
1108         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1109
1110         if (cstat)
1111                 goto error;
1112         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1113                 goto error;
1114         if (!(dstat & DEV_STAT_DEV_END))
1115                 goto error;
1116         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1117         return;
1118
1119 error:
1120         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1121         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1122         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1123 }
1124
1125 /* qdio interrupt handler */
1126 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1127                       struct irb *irb)
1128 {
1129         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1130         int cstat, dstat;
1131
1132         if (!intparm || !irq_ptr) {
1133                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1134                 return;
1135         }
1136
1137         if (irq_ptr->perf_stat_enabled)
1138                 irq_ptr->perf_stat.qdio_int++;
1139
1140         if (IS_ERR(irb)) {
1141                 switch (PTR_ERR(irb)) {
1142                 case -EIO:
1143                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1144                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1145                         wake_up(&cdev->private->wait_q);
1146                         return;
1147                 default:
1148                         WARN_ON(1);
1149                         return;
1150                 }
1151         }
1152         qdio_irq_check_sense(irq_ptr, irb);
1153         cstat = irb->scsw.cmd.cstat;
1154         dstat = irb->scsw.cmd.dstat;
1155
1156         switch (irq_ptr->state) {
1157         case QDIO_IRQ_STATE_INACTIVE:
1158                 qdio_establish_handle_irq(cdev, cstat, dstat);
1159                 break;
1160         case QDIO_IRQ_STATE_CLEANUP:
1161                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1162                 break;
1163         case QDIO_IRQ_STATE_ESTABLISHED:
1164         case QDIO_IRQ_STATE_ACTIVE:
1165                 if (cstat & SCHN_STAT_PCI) {
1166                         qdio_int_handler_pci(irq_ptr);
1167                         return;
1168                 }
1169                 if (cstat || dstat)
1170                         qdio_handle_activate_check(cdev, intparm, cstat,
1171                                                    dstat);
1172                 break;
1173         case QDIO_IRQ_STATE_STOPPED:
1174                 break;
1175         default:
1176                 WARN_ON(1);
1177         }
1178         wake_up(&cdev->private->wait_q);
1179 }
1180
1181 /**
1182  * qdio_get_ssqd_desc - get qdio subchannel description
1183  * @cdev: ccw device to get description for
1184  * @data: where to store the ssqd
1185  *
1186  * Returns 0 or an error code. The results of the chsc are stored in the
1187  * specified structure.
1188  */
1189 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1190                        struct qdio_ssqd_desc *data)
1191 {
1192
1193         if (!cdev || !cdev->private)
1194                 return -EINVAL;
1195
1196         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1197         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1198 }
1199 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1200
1201 static void qdio_shutdown_queues(struct ccw_device *cdev)
1202 {
1203         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1204         struct qdio_q *q;
1205         int i;
1206
1207         for_each_input_queue(irq_ptr, q, i)
1208                 tasklet_kill(&q->tasklet);
1209
1210         for_each_output_queue(irq_ptr, q, i) {
1211                 del_timer(&q->u.out.timer);
1212                 tasklet_kill(&q->tasklet);
1213         }
1214 }
1215
1216 /**
1217  * qdio_shutdown - shut down a qdio subchannel
1218  * @cdev: associated ccw device
1219  * @how: use halt or clear to shutdown
1220  */
1221 int qdio_shutdown(struct ccw_device *cdev, int how)
1222 {
1223         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1224         int rc;
1225         unsigned long flags;
1226
1227         if (!irq_ptr)
1228                 return -ENODEV;
1229
1230         BUG_ON(irqs_disabled());
1231         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1232
1233         mutex_lock(&irq_ptr->setup_mutex);
1234         /*
1235          * Subchannel was already shot down. We cannot prevent being called
1236          * twice since cio may trigger a shutdown asynchronously.
1237          */
1238         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1239                 mutex_unlock(&irq_ptr->setup_mutex);
1240                 return 0;
1241         }
1242
1243         /*
1244          * Indicate that the device is going down. Scheduling the queue
1245          * tasklets is forbidden from here on.
1246          */
1247         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1248
1249         tiqdio_remove_input_queues(irq_ptr);
1250         qdio_shutdown_queues(cdev);
1251         qdio_shutdown_debug_entries(irq_ptr, cdev);
1252
1253         /* cleanup subchannel */
1254         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1255
1256         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1257                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1258         else
1259                 /* default behaviour is halt */
1260                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1261         if (rc) {
1262                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1263                 DBF_ERROR("rc:%4d", rc);
1264                 goto no_cleanup;
1265         }
1266
1267         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1268         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1269         wait_event_interruptible_timeout(cdev->private->wait_q,
1270                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1271                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1272                 10 * HZ);
1273         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1274
1275 no_cleanup:
1276         qdio_shutdown_thinint(irq_ptr);
1277
1278         /* restore interrupt handler */
1279         if ((void *)cdev->handler == (void *)qdio_int_handler)
1280                 cdev->handler = irq_ptr->orig_handler;
1281         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1282
1283         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1284         mutex_unlock(&irq_ptr->setup_mutex);
1285         if (rc)
1286                 return rc;
1287         return 0;
1288 }
1289 EXPORT_SYMBOL_GPL(qdio_shutdown);
1290
1291 /**
1292  * qdio_free - free data structures for a qdio subchannel
1293  * @cdev: associated ccw device
1294  */
1295 int qdio_free(struct ccw_device *cdev)
1296 {
1297         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1298
1299         if (!irq_ptr)
1300                 return -ENODEV;
1301
1302         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1303         mutex_lock(&irq_ptr->setup_mutex);
1304
1305         if (irq_ptr->debug_area != NULL) {
1306                 debug_unregister(irq_ptr->debug_area);
1307                 irq_ptr->debug_area = NULL;
1308         }
1309         cdev->private->qdio_data = NULL;
1310         mutex_unlock(&irq_ptr->setup_mutex);
1311
1312         qdio_release_memory(irq_ptr);
1313         return 0;
1314 }
1315 EXPORT_SYMBOL_GPL(qdio_free);
1316
1317 /**
1318  * qdio_allocate - allocate qdio queues and associated data
1319  * @init_data: initialization data
1320  */
1321 int qdio_allocate(struct qdio_initialize *init_data)
1322 {
1323         struct qdio_irq *irq_ptr;
1324
1325         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1326
1327         if ((init_data->no_input_qs && !init_data->input_handler) ||
1328             (init_data->no_output_qs && !init_data->output_handler))
1329                 return -EINVAL;
1330
1331         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1332             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1333                 return -EINVAL;
1334
1335         if ((!init_data->input_sbal_addr_array) ||
1336             (!init_data->output_sbal_addr_array))
1337                 return -EINVAL;
1338
1339         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1340         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1341         if (!irq_ptr)
1342                 goto out_err;
1343
1344         mutex_init(&irq_ptr->setup_mutex);
1345         qdio_allocate_dbf(init_data, irq_ptr);
1346
1347         /*
1348          * Allocate a page for the chsc calls in qdio_establish.
1349          * Must be pre-allocated since a zfcp recovery will call
1350          * qdio_establish. In case of low memory and swap on a zfcp disk
1351          * we may not be able to allocate memory otherwise.
1352          */
1353         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1354         if (!irq_ptr->chsc_page)
1355                 goto out_rel;
1356
1357         /* qdr is used in ccw1.cda which is u32 */
1358         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1359         if (!irq_ptr->qdr)
1360                 goto out_rel;
1361         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1362
1363         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1364                              init_data->no_output_qs))
1365                 goto out_rel;
1366
1367         init_data->cdev->private->qdio_data = irq_ptr;
1368         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1369         return 0;
1370 out_rel:
1371         qdio_release_memory(irq_ptr);
1372 out_err:
1373         return -ENOMEM;
1374 }
1375 EXPORT_SYMBOL_GPL(qdio_allocate);
1376
1377 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1378 {
1379         struct qdio_q *q = irq_ptr->input_qs[0];
1380         int i, use_cq = 0;
1381
1382         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1383                 use_cq = 1;
1384
1385         for_each_output_queue(irq_ptr, q, i) {
1386                 if (use_cq) {
1387                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1388                                 use_cq = 0;
1389                                 continue;
1390                         }
1391                 } else
1392                         qdio_disable_async_operation(&q->u.out);
1393         }
1394         DBF_EVENT("use_cq:%d", use_cq);
1395 }
1396
1397 /**
1398  * qdio_establish - establish queues on a qdio subchannel
1399  * @init_data: initialization data
1400  */
1401 int qdio_establish(struct qdio_initialize *init_data)
1402 {
1403         struct qdio_irq *irq_ptr;
1404         struct ccw_device *cdev = init_data->cdev;
1405         unsigned long saveflags;
1406         int rc;
1407
1408         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1409
1410         irq_ptr = cdev->private->qdio_data;
1411         if (!irq_ptr)
1412                 return -ENODEV;
1413
1414         if (cdev->private->state != DEV_STATE_ONLINE)
1415                 return -EINVAL;
1416
1417         mutex_lock(&irq_ptr->setup_mutex);
1418         qdio_setup_irq(init_data);
1419
1420         rc = qdio_establish_thinint(irq_ptr);
1421         if (rc) {
1422                 mutex_unlock(&irq_ptr->setup_mutex);
1423                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1424                 return rc;
1425         }
1426
1427         /* establish q */
1428         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1429         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1430         irq_ptr->ccw.count = irq_ptr->equeue.count;
1431         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1432
1433         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1434         ccw_device_set_options_mask(cdev, 0);
1435
1436         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1437         if (rc) {
1438                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1439                 DBF_ERROR("rc:%4x", rc);
1440         }
1441         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1442
1443         if (rc) {
1444                 mutex_unlock(&irq_ptr->setup_mutex);
1445                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1446                 return rc;
1447         }
1448
1449         wait_event_interruptible_timeout(cdev->private->wait_q,
1450                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1451                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1452
1453         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1454                 mutex_unlock(&irq_ptr->setup_mutex);
1455                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1456                 return -EIO;
1457         }
1458
1459         qdio_setup_ssqd_info(irq_ptr);
1460
1461         qdio_detect_hsicq(irq_ptr);
1462
1463         /* qebsm is now setup if available, initialize buffer states */
1464         qdio_init_buf_states(irq_ptr);
1465
1466         mutex_unlock(&irq_ptr->setup_mutex);
1467         qdio_print_subchannel_info(irq_ptr, cdev);
1468         qdio_setup_debug_entries(irq_ptr, cdev);
1469         return 0;
1470 }
1471 EXPORT_SYMBOL_GPL(qdio_establish);
1472
1473 /**
1474  * qdio_activate - activate queues on a qdio subchannel
1475  * @cdev: associated cdev
1476  */
1477 int qdio_activate(struct ccw_device *cdev)
1478 {
1479         struct qdio_irq *irq_ptr;
1480         int rc;
1481         unsigned long saveflags;
1482
1483         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1484
1485         irq_ptr = cdev->private->qdio_data;
1486         if (!irq_ptr)
1487                 return -ENODEV;
1488
1489         if (cdev->private->state != DEV_STATE_ONLINE)
1490                 return -EINVAL;
1491
1492         mutex_lock(&irq_ptr->setup_mutex);
1493         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1494                 rc = -EBUSY;
1495                 goto out;
1496         }
1497
1498         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1499         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1500         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1501         irq_ptr->ccw.cda = 0;
1502
1503         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1504         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1505
1506         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1507                               0, DOIO_DENY_PREFETCH);
1508         if (rc) {
1509                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1510                 DBF_ERROR("rc:%4x", rc);
1511         }
1512         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1513
1514         if (rc)
1515                 goto out;
1516
1517         if (is_thinint_irq(irq_ptr))
1518                 tiqdio_add_input_queues(irq_ptr);
1519
1520         /* wait for subchannel to become active */
1521         msleep(5);
1522
1523         switch (irq_ptr->state) {
1524         case QDIO_IRQ_STATE_STOPPED:
1525         case QDIO_IRQ_STATE_ERR:
1526                 rc = -EIO;
1527                 break;
1528         default:
1529                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1530                 rc = 0;
1531         }
1532 out:
1533         mutex_unlock(&irq_ptr->setup_mutex);
1534         return rc;
1535 }
1536 EXPORT_SYMBOL_GPL(qdio_activate);
1537
1538 static inline int buf_in_between(int bufnr, int start, int count)
1539 {
1540         int end = add_buf(start, count);
1541
1542         if (end > start) {
1543                 if (bufnr >= start && bufnr < end)
1544                         return 1;
1545                 else
1546                         return 0;
1547         }
1548
1549         /* wrap-around case */
1550         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1551             (bufnr < end))
1552                 return 1;
1553         else
1554                 return 0;
1555 }
1556
1557 /**
1558  * handle_inbound - reset processed input buffers
1559  * @q: queue containing the buffers
1560  * @callflags: flags
1561  * @bufnr: first buffer to process
1562  * @count: how many buffers are emptied
1563  */
1564 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1565                           int bufnr, int count)
1566 {
1567         int used, diff;
1568
1569         qperf_inc(q, inbound_call);
1570
1571         if (!q->u.in.polling)
1572                 goto set;
1573
1574         /* protect against stop polling setting an ACK for an emptied slsb */
1575         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1576                 /* overwriting everything, just delete polling status */
1577                 q->u.in.polling = 0;
1578                 q->u.in.ack_count = 0;
1579                 goto set;
1580         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1581                 if (is_qebsm(q)) {
1582                         /* partial overwrite, just update ack_start */
1583                         diff = add_buf(bufnr, count);
1584                         diff = sub_buf(diff, q->u.in.ack_start);
1585                         q->u.in.ack_count -= diff;
1586                         if (q->u.in.ack_count <= 0) {
1587                                 q->u.in.polling = 0;
1588                                 q->u.in.ack_count = 0;
1589                                 goto set;
1590                         }
1591                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1592                 }
1593                 else
1594                         /* the only ACK will be deleted, so stop polling */
1595                         q->u.in.polling = 0;
1596         }
1597
1598 set:
1599         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1600
1601         used = atomic_add_return(count, &q->nr_buf_used) - count;
1602         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1603
1604         if (need_siga_in(q))
1605                 return qdio_siga_input(q);
1606
1607         return 0;
1608 }
1609
1610 /**
1611  * handle_outbound - process filled outbound buffers
1612  * @q: queue containing the buffers
1613  * @callflags: flags
1614  * @bufnr: first buffer to process
1615  * @count: how many buffers are filled
1616  */
1617 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1618                            int bufnr, int count)
1619 {
1620         unsigned char state = 0;
1621         int used, rc = 0;
1622
1623         qperf_inc(q, outbound_call);
1624
1625         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1626         used = atomic_add_return(count, &q->nr_buf_used);
1627         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1628
1629         if (used == QDIO_MAX_BUFFERS_PER_Q)
1630                 qperf_inc(q, outbound_queue_full);
1631
1632         if (callflags & QDIO_FLAG_PCI_OUT) {
1633                 q->u.out.pci_out_enabled = 1;
1634                 qperf_inc(q, pci_request_int);
1635         } else
1636                 q->u.out.pci_out_enabled = 0;
1637
1638         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1639                 unsigned long phys_aob = 0;
1640
1641                 /* One SIGA-W per buffer required for unicast HSI */
1642                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1643
1644                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1645
1646                 rc = qdio_kick_outbound_q(q, phys_aob);
1647         } else if (need_siga_sync(q)) {
1648                 rc = qdio_siga_sync_q(q);
1649         } else {
1650                 /* try to fast requeue buffers */
1651                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1652                 if (state != SLSB_CU_OUTPUT_PRIMED)
1653                         rc = qdio_kick_outbound_q(q, 0);
1654                 else
1655                         qperf_inc(q, fast_requeue);
1656         }
1657
1658         /* in case of SIGA errors we must process the error immediately */
1659         if (used >= q->u.out.scan_threshold || rc)
1660                 tasklet_schedule(&q->tasklet);
1661         else
1662                 /* free the SBALs in case of no further traffic */
1663                 if (!timer_pending(&q->u.out.timer))
1664                         mod_timer(&q->u.out.timer, jiffies + HZ);
1665         return rc;
1666 }
1667
1668 /**
1669  * do_QDIO - process input or output buffers
1670  * @cdev: associated ccw_device for the qdio subchannel
1671  * @callflags: input or output and special flags from the program
1672  * @q_nr: queue number
1673  * @bufnr: buffer number
1674  * @count: how many buffers to process
1675  */
1676 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1677             int q_nr, unsigned int bufnr, unsigned int count)
1678 {
1679         struct qdio_irq *irq_ptr;
1680
1681
1682         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1683                 return -EINVAL;
1684
1685         irq_ptr = cdev->private->qdio_data;
1686         if (!irq_ptr)
1687                 return -ENODEV;
1688
1689         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1690                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1691
1692         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1693                 return -EIO;
1694         if (!count)
1695                 return 0;
1696         if (callflags & QDIO_FLAG_SYNC_INPUT)
1697                 return handle_inbound(irq_ptr->input_qs[q_nr],
1698                                       callflags, bufnr, count);
1699         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1700                 return handle_outbound(irq_ptr->output_qs[q_nr],
1701                                        callflags, bufnr, count);
1702         return -EINVAL;
1703 }
1704 EXPORT_SYMBOL_GPL(do_QDIO);
1705
1706 /**
1707  * qdio_start_irq - process input buffers
1708  * @cdev: associated ccw_device for the qdio subchannel
1709  * @nr: input queue number
1710  *
1711  * Return codes
1712  *   0 - success
1713  *   1 - irqs not started since new data is available
1714  */
1715 int qdio_start_irq(struct ccw_device *cdev, int nr)
1716 {
1717         struct qdio_q *q;
1718         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1719
1720         if (!irq_ptr)
1721                 return -ENODEV;
1722         q = irq_ptr->input_qs[nr];
1723
1724         WARN_ON(queue_irqs_enabled(q));
1725
1726         clear_nonshared_ind(irq_ptr);
1727         qdio_stop_polling(q);
1728         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1729
1730         /*
1731          * We need to check again to not lose initiative after
1732          * resetting the ACK state.
1733          */
1734         if (test_nonshared_ind(irq_ptr))
1735                 goto rescan;
1736         if (!qdio_inbound_q_done(q))
1737                 goto rescan;
1738         return 0;
1739
1740 rescan:
1741         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1742                              &q->u.in.queue_irq_state))
1743                 return 0;
1744         else
1745                 return 1;
1746
1747 }
1748 EXPORT_SYMBOL(qdio_start_irq);
1749
1750 /**
1751  * qdio_get_next_buffers - process input buffers
1752  * @cdev: associated ccw_device for the qdio subchannel
1753  * @nr: input queue number
1754  * @bufnr: first filled buffer number
1755  * @error: buffers are in error state
1756  *
1757  * Return codes
1758  *   < 0 - error
1759  *   = 0 - no new buffers found
1760  *   > 0 - number of processed buffers
1761  */
1762 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1763                           int *error)
1764 {
1765         struct qdio_q *q;
1766         int start, end;
1767         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1768
1769         if (!irq_ptr)
1770                 return -ENODEV;
1771         q = irq_ptr->input_qs[nr];
1772         WARN_ON(queue_irqs_enabled(q));
1773
1774         /*
1775          * Cannot rely on automatic sync after interrupt since queues may
1776          * also be examined without interrupt.
1777          */
1778         if (need_siga_sync(q))
1779                 qdio_sync_queues(q);
1780
1781         /* check the PCI capable outbound queues. */
1782         qdio_check_outbound_after_thinint(q);
1783
1784         if (!qdio_inbound_q_moved(q))
1785                 return 0;
1786
1787         /* Note: upper-layer MUST stop processing immediately here ... */
1788         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1789                 return -EIO;
1790
1791         start = q->first_to_kick;
1792         end = q->first_to_check;
1793         *bufnr = start;
1794         *error = q->qdio_error;
1795
1796         /* for the next time */
1797         q->first_to_kick = end;
1798         q->qdio_error = 0;
1799         return sub_buf(end, start);
1800 }
1801 EXPORT_SYMBOL(qdio_get_next_buffers);
1802
1803 /**
1804  * qdio_stop_irq - disable interrupt processing for the device
1805  * @cdev: associated ccw_device for the qdio subchannel
1806  * @nr: input queue number
1807  *
1808  * Return codes
1809  *   0 - interrupts were already disabled
1810  *   1 - interrupts successfully disabled
1811  */
1812 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1813 {
1814         struct qdio_q *q;
1815         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1816
1817         if (!irq_ptr)
1818                 return -ENODEV;
1819         q = irq_ptr->input_qs[nr];
1820
1821         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1822                              &q->u.in.queue_irq_state))
1823                 return 0;
1824         else
1825                 return 1;
1826 }
1827 EXPORT_SYMBOL(qdio_stop_irq);
1828
1829 static int __init init_QDIO(void)
1830 {
1831         int rc;
1832
1833         rc = qdio_debug_init();
1834         if (rc)
1835                 return rc;
1836         rc = qdio_setup_init();
1837         if (rc)
1838                 goto out_debug;
1839         rc = tiqdio_allocate_memory();
1840         if (rc)
1841                 goto out_cache;
1842         rc = tiqdio_register_thinints();
1843         if (rc)
1844                 goto out_ti;
1845         return 0;
1846
1847 out_ti:
1848         tiqdio_free_memory();
1849 out_cache:
1850         qdio_setup_exit();
1851 out_debug:
1852         qdio_debug_exit();
1853         return rc;
1854 }
1855
1856 static void __exit exit_QDIO(void)
1857 {
1858         tiqdio_unregister_thinints();
1859         tiqdio_free_memory();
1860         qdio_setup_exit();
1861         qdio_debug_exit();
1862 }
1863
1864 module_init(init_QDIO);
1865 module_exit(exit_QDIO);