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   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 #include "qdio_perf.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(struct subchannel_id schid,
  33                                unsigned int out_mask, unsigned int in_mask)
  34 {
  35         register unsigned long __fc asm ("0") = 2;
  36         register struct subchannel_id __schid asm ("1") = schid;
  37         register unsigned long out asm ("2") = out_mask;
  38         register unsigned long in asm ("3") = in_mask;
  39         int cc;
  40
  41         asm volatile(
  42                 "       siga    0\n"
  43                 "       ipm     %0\n"
  44                 "       srl     %0,28\n"
  45                 : "=d" (cc)
  46                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  47         return cc;
  48 }
  49
  50 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
  51 {
  52         register unsigned long __fc asm ("0") = 1;
  53         register struct subchannel_id __schid asm ("1") = schid;
  54         register unsigned long __mask asm ("2") = mask;
  55         int cc;
  56
  57         asm volatile(
  58                 "       siga    0\n"
  59                 "       ipm     %0\n"
  60                 "       srl     %0,28\n"
  61                 : "=d" (cc)
  62                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  63         return cc;
  64 }
  65
  66 /**
  67  * do_siga_output - perform SIGA-w/wt function
  68  * @schid: subchannel id or in case of QEBSM the subchannel token
  69  * @mask: which output queues to process
  70  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  71  * @fc: function code to perform
  72  *
  73  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
  74  * Note: For IQDC unicast queues only the highest priority queue is processed.
  75  */
  76 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  77                                  unsigned int *bb, unsigned int fc)
  78 {
  79         register unsigned long __fc asm("0") = fc;
  80         register unsigned long __schid asm("1") = schid;
  81         register unsigned long __mask asm("2") = mask;
  82         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  83
  84         asm volatile(
  85                 "       siga    0\n"
  86                 "0:     ipm     %0\n"
  87                 "       srl     %0,28\n"
  88                 "1:\n"
  89                 EX_TABLE(0b, 1b)
  90                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
  91                 : : "cc", "memory");
  92         *bb = ((unsigned int) __fc) >> 31;
  93         return cc;
  94 }
  95
  96 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
  97 {
  98         /* all done or next buffer state different */
  99         if (ccq == 0 || ccq == 32)
 100                 return 0;
 101         /* not all buffers processed */
 102         if (ccq == 96 || ccq == 97)
 103                 return 1;
 104         /* notify devices immediately */
 105         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 106         return -EIO;
 107 }
 108
 109 /**
 110  * qdio_do_eqbs - extract buffer states for QEBSM
 111  * @q: queue to manipulate
 112  * @state: state of the extracted buffers
 113  * @start: buffer number to start at
 114  * @count: count of buffers to examine
 115  * @auto_ack: automatically acknowledge buffers
 116  *
 117  * Returns the number of successfully extracted equal buffer states.
 118  * Stops processing if a state is different from the last buffers state.
 119  */
 120 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 121                         int start, int count, int auto_ack)
 122 {
 123         unsigned int ccq = 0;
 124         int tmp_count = count, tmp_start = start;
 125         int nr = q->nr;
 126         int rc;
 127
 128         BUG_ON(!q->irq_ptr->sch_token);
 129         qdio_perf_stat_inc(&perf_stats.debug_eqbs_all);
 130
 131         if (!q->is_input_q)
 132                 nr += q->irq_ptr->nr_input_qs;
 133 again:
 134         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 135                       auto_ack);
 136         rc = qdio_check_ccq(q, ccq);
 137
 138         /* At least one buffer was processed, return and extract the remaining
 139          * buffers later.
 140          */
 141         if ((ccq == 96) && (count != tmp_count)) {
 142                 qdio_perf_stat_inc(&perf_stats.debug_eqbs_incomplete);
 143                 return (count - tmp_count);
 144         }
 145
 146         if (rc == 1) {
 147                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 148                 goto again;
 149         }
 150
 151         if (rc < 0) {
 152                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 153                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 154                 q->handler(q->irq_ptr->cdev,
 155                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 156                            0, -1, -1, q->irq_ptr->int_parm);
 157                 return 0;
 158         }
 159         return count - tmp_count;
 160 }
 161
 162 /**
 163  * qdio_do_sqbs - set buffer states for QEBSM
 164  * @q: queue to manipulate
 165  * @state: new state of the buffers
 166  * @start: first buffer number to change
 167  * @count: how many buffers to change
 168  *
 169  * Returns the number of successfully changed buffers.
 170  * Does retrying until the specified count of buffer states is set or an
 171  * error occurs.
 172  */
 173 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 174                         int count)
 175 {
 176         unsigned int ccq = 0;
 177         int tmp_count = count, tmp_start = start;
 178         int nr = q->nr;
 179         int rc;
 180
 181         if (!count)
 182                 return 0;
 183
 184         BUG_ON(!q->irq_ptr->sch_token);
 185         qdio_perf_stat_inc(&perf_stats.debug_sqbs_all);
 186
 187         if (!q->is_input_q)
 188                 nr += q->irq_ptr->nr_input_qs;
 189 again:
 190         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 191         rc = qdio_check_ccq(q, ccq);
 192         if (rc == 1) {
 193                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 194                 qdio_perf_stat_inc(&perf_stats.debug_sqbs_incomplete);
 195                 goto again;
 196         }
 197         if (rc < 0) {
 198                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 199                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 200                 q->handler(q->irq_ptr->cdev,
 201                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 202                            0, -1, -1, q->irq_ptr->int_parm);
 203                 return 0;
 204         }
 205         WARN_ON(tmp_count);
 206         return count - tmp_count;
 207 }
 208
 209 /* returns number of examined buffers and their common state in *state */
 210 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 211                                  unsigned char *state, unsigned int count,
 212                                  int auto_ack)
 213 {
 214         unsigned char __state = 0;
 215         int i;
 216
 217         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 218         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 219
 220         if (is_qebsm(q))
 221                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 222
 223         for (i = 0; i < count; i++) {
 224                 if (!__state)
 225                         __state = q->slsb.val[bufnr];
 226                 else if (q->slsb.val[bufnr] != __state)
 227                         break;
 228                 bufnr = next_buf(bufnr);
 229         }
 230         *state = __state;
 231         return i;
 232 }
 233
 234 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 235                                 unsigned char *state, int auto_ack)
 236 {
 237         return get_buf_states(q, bufnr, state, 1, auto_ack);
 238 }
 239
 240 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 241 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 242                                  unsigned char state, int count)
 243 {
 244         int i;
 245
 246         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 247         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 248
 249         if (is_qebsm(q))
 250                 return qdio_do_sqbs(q, state, bufnr, count);
 251
 252         for (i = 0; i < count; i++) {
 253                 xchg(&q->slsb.val[bufnr], state);
 254                 bufnr = next_buf(bufnr);
 255         }
 256         return count;
 257 }
 258
 259 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 260                                 unsigned char state)
 261 {
 262         return set_buf_states(q, bufnr, state, 1);
 263 }
 264
 265 /* set slsb states to initial state */
 266 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 267 {
 268         struct qdio_q *q;
 269         int i;
 270
 271         for_each_input_queue(irq_ptr, q, i)
 272                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 273                                QDIO_MAX_BUFFERS_PER_Q);
 274         for_each_output_queue(irq_ptr, q, i)
 275                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 276                                QDIO_MAX_BUFFERS_PER_Q);
 277 }
 278
 279 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 280                           unsigned int input)
 281 {
 282         int cc;
 283
 284         if (!need_siga_sync(q))
 285                 return 0;
 286
 287         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 288         qdio_perf_stat_inc(&perf_stats.siga_sync);
 289
 290         cc = do_siga_sync(q->irq_ptr->schid, output, input);
 291         if (cc)
 292                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 293         return cc;
 294 }
 295
 296 static inline int qdio_siga_sync_q(struct qdio_q *q)
 297 {
 298         if (q->is_input_q)
 299                 return qdio_siga_sync(q, 0, q->mask);
 300         else
 301                 return qdio_siga_sync(q, q->mask, 0);
 302 }
 303
 304 static inline int qdio_siga_sync_out(struct qdio_q *q)
 305 {
 306         return qdio_siga_sync(q, ~0U, 0);
 307 }
 308
 309 static inline int qdio_siga_sync_all(struct qdio_q *q)
 310 {
 311         return qdio_siga_sync(q, ~0U, ~0U);
 312 }
 313
 314 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 315 {
 316         unsigned long schid;
 317         unsigned int fc = 0;
 318         u64 start_time = 0;
 319         int cc;
 320
 321         if (q->u.out.use_enh_siga)
 322                 fc = 3;
 323
 324         if (is_qebsm(q)) {
 325                 schid = q->irq_ptr->sch_token;
 326                 fc |= 0x80;
 327         }
 328         else
 329                 schid = *((u32 *)&q->irq_ptr->schid);
 330
 331 again:
 332         cc = do_siga_output(schid, q->mask, busy_bit, fc);
 333
 334         /* hipersocket busy condition */
 335         if (*busy_bit) {
 336                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 337
 338                 if (!start_time) {
 339                         start_time = get_usecs();
 340                         goto again;
 341                 }
 342                 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 343                         goto again;
 344         }
 345         return cc;
 346 }
 347
 348 static inline int qdio_siga_input(struct qdio_q *q)
 349 {
 350         int cc;
 351
 352         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 353         qdio_perf_stat_inc(&perf_stats.siga_in);
 354
 355         cc = do_siga_input(q->irq_ptr->schid, q->mask);
 356         if (cc)
 357                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 358         return cc;
 359 }
 360
 361 static inline void qdio_sync_after_thinint(struct qdio_q *q)
 362 {
 363         if (pci_out_supported(q)) {
 364                 if (need_siga_sync_thinint(q))
 365                         qdio_siga_sync_all(q);
 366                 else if (need_siga_sync_out_thinint(q))
 367                         qdio_siga_sync_out(q);
 368         } else
 369                 qdio_siga_sync_q(q);
 370 }
 371
 372 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 373                         unsigned char *state)
 374 {
 375         qdio_siga_sync_q(q);
 376         return get_buf_states(q, bufnr, state, 1, 0);
 377 }
 378
 379 static inline void qdio_stop_polling(struct qdio_q *q)
 380 {
 381         if (!q->u.in.polling)
 382                 return;
 383
 384         q->u.in.polling = 0;
 385         qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
 386
 387         /* show the card that we are not polling anymore */
 388         if (is_qebsm(q)) {
 389                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 390                                q->u.in.ack_count);
 391                 q->u.in.ack_count = 0;
 392         } else
 393                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 394 }
 395
 396 static void announce_buffer_error(struct qdio_q *q, int count)
 397 {
 398         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 399
 400         /* special handling for no target buffer empty */
 401         if ((!q->is_input_q &&
 402             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 403                 qdio_perf_stat_inc(&perf_stats.outbound_target_full);
 404                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d",
 405                               q->first_to_check);
 406                 return;
 407         }
 408
 409         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 410         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 411         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 412         DBF_ERROR("F14:%2x F15:%2x",
 413                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 414                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 415 }
 416
 417 static inline void inbound_primed(struct qdio_q *q, int count)
 418 {
 419         int new;
 420
 421         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count);
 422
 423         /* for QEBSM the ACK was already set by EQBS */
 424         if (is_qebsm(q)) {
 425                 if (!q->u.in.polling) {
 426                         q->u.in.polling = 1;
 427                         q->u.in.ack_count = count;
 428                         q->u.in.ack_start = q->first_to_check;
 429                         return;
 430                 }
 431
 432                 /* delete the previous ACK's */
 433                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 434                                q->u.in.ack_count);
 435                 q->u.in.ack_count = count;
 436                 q->u.in.ack_start = q->first_to_check;
 437                 return;
 438         }
 439
 440         /*
 441          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 442          * or by the next inbound run.
 443          */
 444         new = add_buf(q->first_to_check, count - 1);
 445         if (q->u.in.polling) {
 446                 /* reset the previous ACK but first set the new one */
 447                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 448                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 449         } else {
 450                 q->u.in.polling = 1;
 451                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 452         }
 453
 454         q->u.in.ack_start = new;
 455         count--;
 456         if (!count)
 457                 return;
 458
 459         /*
 460          * Need to change all PRIMED buffers to NOT_INIT, otherwise
 461          * we're loosing initiative in the thinint code.
 462          */
 463         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT,
 464                        count);
 465 }
 466
 467 static int get_inbound_buffer_frontier(struct qdio_q *q)
 468 {
 469         int count, stop;
 470         unsigned char state;
 471
 472         /*
 473          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 474          * would return 0.
 475          */
 476         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 477         stop = add_buf(q->first_to_check, count);
 478
 479         if (q->first_to_check == stop)
 480                 goto out;
 481
 482         /*
 483          * No siga sync here, as a PCI or we after a thin interrupt
 484          * already sync'ed the queues.
 485          */
 486         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 487         if (!count)
 488                 goto out;
 489
 490         switch (state) {
 491         case SLSB_P_INPUT_PRIMED:
 492                 inbound_primed(q, count);
 493                 q->first_to_check = add_buf(q->first_to_check, count);
 494                 atomic_sub(count, &q->nr_buf_used);
 495                 break;
 496         case SLSB_P_INPUT_ERROR:
 497                 announce_buffer_error(q, count);
 498                 /* process the buffer, the upper layer will take care of it */
 499                 q->first_to_check = add_buf(q->first_to_check, count);
 500                 atomic_sub(count, &q->nr_buf_used);
 501                 break;
 502         case SLSB_CU_INPUT_EMPTY:
 503         case SLSB_P_INPUT_NOT_INIT:
 504         case SLSB_P_INPUT_ACK:
 505                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 506                 break;
 507         default:
 508                 BUG();
 509         }
 510 out:
 511         return q->first_to_check;
 512 }
 513
 514 static int qdio_inbound_q_moved(struct qdio_q *q)
 515 {
 516         int bufnr;
 517
 518         bufnr = get_inbound_buffer_frontier(q);
 519
 520         if ((bufnr != q->last_move) || q->qdio_error) {
 521                 q->last_move = bufnr;
 522                 if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
 523                         q->u.in.timestamp = get_usecs();
 524                 return 1;
 525         } else
 526                 return 0;
 527 }
 528
 529 static inline int qdio_inbound_q_done(struct qdio_q *q)
 530 {
 531         unsigned char state = 0;
 532
 533         if (!atomic_read(&q->nr_buf_used))
 534                 return 1;
 535
 536         qdio_siga_sync_q(q);
 537         get_buf_state(q, q->first_to_check, &state, 0);
 538
 539         if (state == SLSB_P_INPUT_PRIMED)
 540                 /* more work coming */
 541                 return 0;
 542
 543         if (is_thinint_irq(q->irq_ptr))
 544                 return 1;
 545
 546         /* don't poll under z/VM */
 547         if (MACHINE_IS_VM)
 548                 return 1;
 549
 550         /*
 551          * At this point we know, that inbound first_to_check
 552          * has (probably) not moved (see qdio_inbound_processing).
 553          */
 554         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 555                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d",
 556                               q->first_to_check);
 557                 return 1;
 558         } else
 559                 return 0;
 560 }
 561
 562 static void qdio_kick_handler(struct qdio_q *q)
 563 {
 564         int start = q->first_to_kick;
 565         int end = q->first_to_check;
 566         int count;
 567
 568         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 569                 return;
 570
 571         count = sub_buf(end, start);
 572
 573         if (q->is_input_q) {
 574                 qdio_perf_stat_inc(&perf_stats.inbound_handler);
 575                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count);
 576         } else {
 577                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: nr:%1d", q->nr);
 578                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count);
 579         }
 580
 581         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 582                    q->irq_ptr->int_parm);
 583
 584         /* for the next time */
 585         q->first_to_kick = end;
 586         q->qdio_error = 0;
 587 }
 588
 589 static void __qdio_inbound_processing(struct qdio_q *q)
 590 {
 591         qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
 592 again:
 593         if (!qdio_inbound_q_moved(q))
 594                 return;
 595
 596         qdio_kick_handler(q);
 597
 598         if (!qdio_inbound_q_done(q))
 599                 /* means poll time is not yet over */
 600                 goto again;
 601
 602         qdio_stop_polling(q);
 603         /*
 604          * We need to check again to not lose initiative after
 605          * resetting the ACK state.
 606          */
 607         if (!qdio_inbound_q_done(q))
 608                 goto again;
 609 }
 610
 611 void qdio_inbound_processing(unsigned long data)
 612 {
 613         struct qdio_q *q = (struct qdio_q *)data;
 614         __qdio_inbound_processing(q);
 615 }
 616
 617 static int get_outbound_buffer_frontier(struct qdio_q *q)
 618 {
 619         int count, stop;
 620         unsigned char state;
 621
 622         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 623             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 624                 qdio_siga_sync_q(q);
 625
 626         /*
 627          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 628          * would return 0.
 629          */
 630         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 631         stop = add_buf(q->first_to_check, count);
 632
 633         if (q->first_to_check == stop)
 634                 return q->first_to_check;
 635
 636         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 637         if (!count)
 638                 return q->first_to_check;
 639
 640         switch (state) {
 641         case SLSB_P_OUTPUT_EMPTY:
 642                 /* the adapter got it */
 643                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count);
 644
 645                 atomic_sub(count, &q->nr_buf_used);
 646                 q->first_to_check = add_buf(q->first_to_check, count);
 647                 break;
 648         case SLSB_P_OUTPUT_ERROR:
 649                 announce_buffer_error(q, count);
 650                 /* process the buffer, the upper layer will take care of it */
 651                 q->first_to_check = add_buf(q->first_to_check, count);
 652                 atomic_sub(count, &q->nr_buf_used);
 653                 break;
 654         case SLSB_CU_OUTPUT_PRIMED:
 655                 /* the adapter has not fetched the output yet */
 656                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 657                 break;
 658         case SLSB_P_OUTPUT_NOT_INIT:
 659         case SLSB_P_OUTPUT_HALTED:
 660                 break;
 661         default:
 662                 BUG();
 663         }
 664         return q->first_to_check;
 665 }
 666
 667 /* all buffers processed? */
 668 static inline int qdio_outbound_q_done(struct qdio_q *q)
 669 {
 670         return atomic_read(&q->nr_buf_used) == 0;
 671 }
 672
 673 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 674 {
 675         int bufnr;
 676
 677         bufnr = get_outbound_buffer_frontier(q);
 678
 679         if ((bufnr != q->last_move) || q->qdio_error) {
 680                 q->last_move = bufnr;
 681                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 682                 return 1;
 683         } else
 684                 return 0;
 685 }
 686
 687 static int qdio_kick_outbound_q(struct qdio_q *q)
 688 {
 689         unsigned int busy_bit;
 690         int cc;
 691
 692         if (!need_siga_out(q))
 693                 return 0;
 694
 695         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 696         qdio_perf_stat_inc(&perf_stats.siga_out);
 697
 698         cc = qdio_siga_output(q, &busy_bit);
 699         switch (cc) {
 700         case 0:
 701                 break;
 702         case 2:
 703                 if (busy_bit) {
 704                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 705                         cc |= QDIO_ERROR_SIGA_BUSY;
 706                 } else
 707                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 708                 break;
 709         case 1:
 710         case 3:
 711                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 712                 break;
 713         }
 714         return cc;
 715 }
 716
 717 static void __qdio_outbound_processing(struct qdio_q *q)
 718 {
 719         qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
 720         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 721
 722         if (qdio_outbound_q_moved(q))
 723                 qdio_kick_handler(q);
 724
 725         if (queue_type(q) == QDIO_ZFCP_QFMT)
 726                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 727                         goto sched;
 728
 729         /* bail out for HiperSockets unicast queues */
 730         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 731                 return;
 732
 733         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 734             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 735                 goto sched;
 736
 737         if (q->u.out.pci_out_enabled)
 738                 return;
 739
 740         /*
 741          * Now we know that queue type is either qeth without pci enabled
 742          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 743          * EMPTY is noticed and outbound_handler is called after some time.
 744          */
 745         if (qdio_outbound_q_done(q))
 746                 del_timer(&q->u.out.timer);
 747         else {
 748                 if (!timer_pending(&q->u.out.timer)) {
 749                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 750                         qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
 751                 }
 752         }
 753         return;
 754
 755 sched:
 756         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 757                 return;
 758         tasklet_schedule(&q->tasklet);
 759 }
 760
 761 /* outbound tasklet */
 762 void qdio_outbound_processing(unsigned long data)
 763 {
 764         struct qdio_q *q = (struct qdio_q *)data;
 765         __qdio_outbound_processing(q);
 766 }
 767
 768 void qdio_outbound_timer(unsigned long data)
 769 {
 770         struct qdio_q *q = (struct qdio_q *)data;
 771
 772         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 773                 return;
 774         tasklet_schedule(&q->tasklet);
 775 }
 776
 777 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 778 {
 779         struct qdio_q *out;
 780         int i;
 781
 782         if (!pci_out_supported(q))
 783                 return;
 784
 785         for_each_output_queue(q->irq_ptr, out, i)
 786                 if (!qdio_outbound_q_done(out))
 787                         tasklet_schedule(&out->tasklet);
 788 }
 789
 790 static void __tiqdio_inbound_processing(struct qdio_q *q)
 791 {
 792         qdio_perf_stat_inc(&perf_stats.thinint_inbound);
 793         qdio_sync_after_thinint(q);
 794
 795         /*
 796          * The interrupt could be caused by a PCI request. Check the
 797          * PCI capable outbound queues.
 798          */
 799         qdio_check_outbound_after_thinint(q);
 800
 801         if (!qdio_inbound_q_moved(q))
 802                 return;
 803
 804         qdio_kick_handler(q);
 805
 806         if (!qdio_inbound_q_done(q)) {
 807                 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop);
 808                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 809                         tasklet_schedule(&q->tasklet);
 810         }
 811
 812         qdio_stop_polling(q);
 813         /*
 814          * We need to check again to not lose initiative after
 815          * resetting the ACK state.
 816          */
 817         if (!qdio_inbound_q_done(q)) {
 818                 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2);
 819                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 820                         tasklet_schedule(&q->tasklet);
 821         }
 822 }
 823
 824 void tiqdio_inbound_processing(unsigned long data)
 825 {
 826         struct qdio_q *q = (struct qdio_q *)data;
 827         __tiqdio_inbound_processing(q);
 828 }
 829
 830 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 831                                   enum qdio_irq_states state)
 832 {
 833         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 834
 835         irq_ptr->state = state;
 836         mb();
 837 }
 838
 839 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 840 {
 841         if (irb->esw.esw0.erw.cons) {
 842                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 843                 DBF_ERROR_HEX(irb, 64);
 844                 DBF_ERROR_HEX(irb->ecw, 64);
 845         }
 846 }
 847
 848 /* PCI interrupt handler */
 849 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 850 {
 851         int i;
 852         struct qdio_q *q;
 853
 854         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 855                 return;
 856
 857         qdio_perf_stat_inc(&perf_stats.pci_int);
 858
 859         for_each_input_queue(irq_ptr, q, i)
 860                 tasklet_schedule(&q->tasklet);
 861
 862         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 863                 return;
 864
 865         for_each_output_queue(irq_ptr, q, i) {
 866                 if (qdio_outbound_q_done(q))
 867                         continue;
 868
 869                 if (!siga_syncs_out_pci(q))
 870                         qdio_siga_sync_q(q);
 871
 872                 tasklet_schedule(&q->tasklet);
 873         }
 874 }
 875
 876 static void qdio_handle_activate_check(struct ccw_device *cdev,
 877                                 unsigned long intparm, int cstat, int dstat)
 878 {
 879         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 880         struct qdio_q *q;
 881
 882         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 883         DBF_ERROR("intp :%lx", intparm);
 884         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 885
 886         if (irq_ptr->nr_input_qs) {
 887                 q = irq_ptr->input_qs[0];
 888         } else if (irq_ptr->nr_output_qs) {
 889                 q = irq_ptr->output_qs[0];
 890         } else {
 891                 dump_stack();
 892                 goto no_handler;
 893         }
 894         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 895                    0, -1, -1, irq_ptr->int_parm);
 896 no_handler:
 897         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 898 }
 899
 900 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 901                                       int dstat)
 902 {
 903         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 904
 905         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 906
 907         if (cstat)
 908                 goto error;
 909         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 910                 goto error;
 911         if (!(dstat & DEV_STAT_DEV_END))
 912                 goto error;
 913         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 914         return;
 915
 916 error:
 917         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 918         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 919         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 920 }
 921
 922 /* qdio interrupt handler */
 923 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 924                       struct irb *irb)
 925 {
 926         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 927         int cstat, dstat;
 928
 929         qdio_perf_stat_inc(&perf_stats.qdio_int);
 930
 931         if (!intparm || !irq_ptr) {
 932                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 933                 return;
 934         }
 935
 936         if (IS_ERR(irb)) {
 937                 switch (PTR_ERR(irb)) {
 938                 case -EIO:
 939                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 940                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 941                         wake_up(&cdev->private->wait_q);
 942                         return;
 943                 default:
 944                         WARN_ON(1);
 945                         return;
 946                 }
 947         }
 948         qdio_irq_check_sense(irq_ptr, irb);
 949         cstat = irb->scsw.cmd.cstat;
 950         dstat = irb->scsw.cmd.dstat;
 951
 952         switch (irq_ptr->state) {
 953         case QDIO_IRQ_STATE_INACTIVE:
 954                 qdio_establish_handle_irq(cdev, cstat, dstat);
 955                 break;
 956         case QDIO_IRQ_STATE_CLEANUP:
 957                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 958                 break;
 959         case QDIO_IRQ_STATE_ESTABLISHED:
 960         case QDIO_IRQ_STATE_ACTIVE:
 961                 if (cstat & SCHN_STAT_PCI) {
 962                         qdio_int_handler_pci(irq_ptr);
 963                         return;
 964                 }
 965                 if (cstat || dstat)
 966                         qdio_handle_activate_check(cdev, intparm, cstat,
 967                                                    dstat);
 968                 break;
 969         default:
 970                 WARN_ON(1);
 971         }
 972         wake_up(&cdev->private->wait_q);
 973 }
 974
 975 /**
 976  * qdio_get_ssqd_desc - get qdio subchannel description
 977  * @cdev: ccw device to get description for
 978  * @data: where to store the ssqd
 979  *
 980  * Returns 0 or an error code. The results of the chsc are stored in the
 981  * specified structure.
 982  */
 983 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 984                        struct qdio_ssqd_desc *data)
 985 {
 986
 987         if (!cdev || !cdev->private)
 988                 return -EINVAL;
 989
 990         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
 991         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
 992 }
 993 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 994
 995 /**
 996  * qdio_cleanup - shutdown queues and free data structures
 997  * @cdev: associated ccw device
 998  * @how: use halt or clear to shutdown
 999  *
1000  * This function calls qdio_shutdown() for @cdev with method @how.
1001  * and qdio_free(). The qdio_free() return value is ignored since
1002  * !irq_ptr is already checked.
1003  */
1004 int qdio_cleanup(struct ccw_device *cdev, int how)
1005 {
1006         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1007         int rc;
1008
1009         if (!irq_ptr)
1010                 return -ENODEV;
1011
1012         rc = qdio_shutdown(cdev, how);
1013
1014         qdio_free(cdev);
1015         return rc;
1016 }
1017 EXPORT_SYMBOL_GPL(qdio_cleanup);
1018
1019 static void qdio_shutdown_queues(struct ccw_device *cdev)
1020 {
1021         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1022         struct qdio_q *q;
1023         int i;
1024
1025         for_each_input_queue(irq_ptr, q, i)
1026                 tasklet_kill(&q->tasklet);
1027
1028         for_each_output_queue(irq_ptr, q, i) {
1029                 del_timer(&q->u.out.timer);
1030                 tasklet_kill(&q->tasklet);
1031         }
1032 }
1033
1034 /**
1035  * qdio_shutdown - shut down a qdio subchannel
1036  * @cdev: associated ccw device
1037  * @how: use halt or clear to shutdown
1038  */
1039 int qdio_shutdown(struct ccw_device *cdev, int how)
1040 {
1041         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1042         int rc;
1043         unsigned long flags;
1044
1045         if (!irq_ptr)
1046                 return -ENODEV;
1047
1048         BUG_ON(irqs_disabled());
1049         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1050
1051         mutex_lock(&irq_ptr->setup_mutex);
1052         /*
1053          * Subchannel was already shot down. We cannot prevent being called
1054          * twice since cio may trigger a shutdown asynchronously.
1055          */
1056         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1057                 mutex_unlock(&irq_ptr->setup_mutex);
1058                 return 0;
1059         }
1060
1061         /*
1062          * Indicate that the device is going down. Scheduling the queue
1063          * tasklets is forbidden from here on.
1064          */
1065         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1066
1067         tiqdio_remove_input_queues(irq_ptr);
1068         qdio_shutdown_queues(cdev);
1069         qdio_shutdown_debug_entries(irq_ptr, cdev);
1070
1071         /* cleanup subchannel */
1072         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1073
1074         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1075                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1076         else
1077                 /* default behaviour is halt */
1078                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1079         if (rc) {
1080                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1081                 DBF_ERROR("rc:%4d", rc);
1082                 goto no_cleanup;
1083         }
1084
1085         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1086         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1087         wait_event_interruptible_timeout(cdev->private->wait_q,
1088                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1089                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1090                 10 * HZ);
1091         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1092
1093 no_cleanup:
1094         qdio_shutdown_thinint(irq_ptr);
1095
1096         /* restore interrupt handler */
1097         if ((void *)cdev->handler == (void *)qdio_int_handler)
1098                 cdev->handler = irq_ptr->orig_handler;
1099         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1100
1101         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1102         mutex_unlock(&irq_ptr->setup_mutex);
1103         if (rc)
1104                 return rc;
1105         return 0;
1106 }
1107 EXPORT_SYMBOL_GPL(qdio_shutdown);
1108
1109 /**
1110  * qdio_free - free data structures for a qdio subchannel
1111  * @cdev: associated ccw device
1112  */
1113 int qdio_free(struct ccw_device *cdev)
1114 {
1115         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1116
1117         if (!irq_ptr)
1118                 return -ENODEV;
1119
1120         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1121         mutex_lock(&irq_ptr->setup_mutex);
1122
1123         if (irq_ptr->debug_area != NULL) {
1124                 debug_unregister(irq_ptr->debug_area);
1125                 irq_ptr->debug_area = NULL;
1126         }
1127         cdev->private->qdio_data = NULL;
1128         mutex_unlock(&irq_ptr->setup_mutex);
1129
1130         qdio_release_memory(irq_ptr);
1131         return 0;
1132 }
1133 EXPORT_SYMBOL_GPL(qdio_free);
1134
1135 /**
1136  * qdio_initialize - allocate and establish queues for a qdio subchannel
1137  * @init_data: initialization data
1138  *
1139  * This function first allocates queues via qdio_allocate() and on success
1140  * establishes them via qdio_establish().
1141  */
1142 int qdio_initialize(struct qdio_initialize *init_data)
1143 {
1144         int rc;
1145
1146         rc = qdio_allocate(init_data);
1147         if (rc)
1148                 return rc;
1149
1150         rc = qdio_establish(init_data);
1151         if (rc)
1152                 qdio_free(init_data->cdev);
1153         return rc;
1154 }
1155 EXPORT_SYMBOL_GPL(qdio_initialize);
1156
1157 /**
1158  * qdio_allocate - allocate qdio queues and associated data
1159  * @init_data: initialization data
1160  */
1161 int qdio_allocate(struct qdio_initialize *init_data)
1162 {
1163         struct qdio_irq *irq_ptr;
1164
1165         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1166
1167         if ((init_data->no_input_qs && !init_data->input_handler) ||
1168             (init_data->no_output_qs && !init_data->output_handler))
1169                 return -EINVAL;
1170
1171         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1172             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1173                 return -EINVAL;
1174
1175         if ((!init_data->input_sbal_addr_array) ||
1176             (!init_data->output_sbal_addr_array))
1177                 return -EINVAL;
1178
1179         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1180         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1181         if (!irq_ptr)
1182                 goto out_err;
1183
1184         mutex_init(&irq_ptr->setup_mutex);
1185         qdio_allocate_dbf(init_data, irq_ptr);
1186
1187         /*
1188          * Allocate a page for the chsc calls in qdio_establish.
1189          * Must be pre-allocated since a zfcp recovery will call
1190          * qdio_establish. In case of low memory and swap on a zfcp disk
1191          * we may not be able to allocate memory otherwise.
1192          */
1193         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1194         if (!irq_ptr->chsc_page)
1195                 goto out_rel;
1196
1197         /* qdr is used in ccw1.cda which is u32 */
1198         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1199         if (!irq_ptr->qdr)
1200                 goto out_rel;
1201         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1202
1203         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1204                              init_data->no_output_qs))
1205                 goto out_rel;
1206
1207         init_data->cdev->private->qdio_data = irq_ptr;
1208         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1209         return 0;
1210 out_rel:
1211         qdio_release_memory(irq_ptr);
1212 out_err:
1213         return -ENOMEM;
1214 }
1215 EXPORT_SYMBOL_GPL(qdio_allocate);
1216
1217 /**
1218  * qdio_establish - establish queues on a qdio subchannel
1219  * @init_data: initialization data
1220  */
1221 int qdio_establish(struct qdio_initialize *init_data)
1222 {
1223         struct qdio_irq *irq_ptr;
1224         struct ccw_device *cdev = init_data->cdev;
1225         unsigned long saveflags;
1226         int rc;
1227
1228         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1229
1230         irq_ptr = cdev->private->qdio_data;
1231         if (!irq_ptr)
1232                 return -ENODEV;
1233
1234         if (cdev->private->state != DEV_STATE_ONLINE)
1235                 return -EINVAL;
1236
1237         mutex_lock(&irq_ptr->setup_mutex);
1238         qdio_setup_irq(init_data);
1239
1240         rc = qdio_establish_thinint(irq_ptr);
1241         if (rc) {
1242                 mutex_unlock(&irq_ptr->setup_mutex);
1243                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1244                 return rc;
1245         }
1246
1247         /* establish q */
1248         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1249         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1250         irq_ptr->ccw.count = irq_ptr->equeue.count;
1251         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1252
1253         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1254         ccw_device_set_options_mask(cdev, 0);
1255
1256         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1257         if (rc) {
1258                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1259                 DBF_ERROR("rc:%4x", rc);
1260         }
1261         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1262
1263         if (rc) {
1264                 mutex_unlock(&irq_ptr->setup_mutex);
1265                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1266                 return rc;
1267         }
1268
1269         wait_event_interruptible_timeout(cdev->private->wait_q,
1270                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1271                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1272
1273         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1274                 mutex_unlock(&irq_ptr->setup_mutex);
1275                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1276                 return -EIO;
1277         }
1278
1279         qdio_setup_ssqd_info(irq_ptr);
1280         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1281         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1282
1283         /* qebsm is now setup if available, initialize buffer states */
1284         qdio_init_buf_states(irq_ptr);
1285
1286         mutex_unlock(&irq_ptr->setup_mutex);
1287         qdio_print_subchannel_info(irq_ptr, cdev);
1288         qdio_setup_debug_entries(irq_ptr, cdev);
1289         return 0;
1290 }
1291 EXPORT_SYMBOL_GPL(qdio_establish);
1292
1293 /**
1294  * qdio_activate - activate queues on a qdio subchannel
1295  * @cdev: associated cdev
1296  */
1297 int qdio_activate(struct ccw_device *cdev)
1298 {
1299         struct qdio_irq *irq_ptr;
1300         int rc;
1301         unsigned long saveflags;
1302
1303         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1304
1305         irq_ptr = cdev->private->qdio_data;
1306         if (!irq_ptr)
1307                 return -ENODEV;
1308
1309         if (cdev->private->state != DEV_STATE_ONLINE)
1310                 return -EINVAL;
1311
1312         mutex_lock(&irq_ptr->setup_mutex);
1313         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1314                 rc = -EBUSY;
1315                 goto out;
1316         }
1317
1318         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1319         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1320         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1321         irq_ptr->ccw.cda = 0;
1322
1323         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1324         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1325
1326         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1327                               0, DOIO_DENY_PREFETCH);
1328         if (rc) {
1329                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1330                 DBF_ERROR("rc:%4x", rc);
1331         }
1332         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1333
1334         if (rc)
1335                 goto out;
1336
1337         if (is_thinint_irq(irq_ptr))
1338                 tiqdio_add_input_queues(irq_ptr);
1339
1340         /* wait for subchannel to become active */
1341         msleep(5);
1342
1343         switch (irq_ptr->state) {
1344         case QDIO_IRQ_STATE_STOPPED:
1345         case QDIO_IRQ_STATE_ERR:
1346                 rc = -EIO;
1347                 break;
1348         default:
1349                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1350                 rc = 0;
1351         }
1352 out:
1353         mutex_unlock(&irq_ptr->setup_mutex);
1354         return rc;
1355 }
1356 EXPORT_SYMBOL_GPL(qdio_activate);
1357
1358 static inline int buf_in_between(int bufnr, int start, int count)
1359 {
1360         int end = add_buf(start, count);
1361
1362         if (end > start) {
1363                 if (bufnr >= start && bufnr < end)
1364                         return 1;
1365                 else
1366                         return 0;
1367         }
1368
1369         /* wrap-around case */
1370         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1371             (bufnr < end))
1372                 return 1;
1373         else
1374                 return 0;
1375 }
1376
1377 /**
1378  * handle_inbound - reset processed input buffers
1379  * @q: queue containing the buffers
1380  * @callflags: flags
1381  * @bufnr: first buffer to process
1382  * @count: how many buffers are emptied
1383  */
1384 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1385                           int bufnr, int count)
1386 {
1387         int used, diff;
1388
1389         if (!q->u.in.polling)
1390                 goto set;
1391
1392         /* protect against stop polling setting an ACK for an emptied slsb */
1393         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1394                 /* overwriting everything, just delete polling status */
1395                 q->u.in.polling = 0;
1396                 q->u.in.ack_count = 0;
1397                 goto set;
1398         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1399                 if (is_qebsm(q)) {
1400                         /* partial overwrite, just update ack_start */
1401                         diff = add_buf(bufnr, count);
1402                         diff = sub_buf(diff, q->u.in.ack_start);
1403                         q->u.in.ack_count -= diff;
1404                         if (q->u.in.ack_count <= 0) {
1405                                 q->u.in.polling = 0;
1406                                 q->u.in.ack_count = 0;
1407                                 goto set;
1408                         }
1409                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1410                 }
1411                 else
1412                         /* the only ACK will be deleted, so stop polling */
1413                         q->u.in.polling = 0;
1414         }
1415
1416 set:
1417         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1418
1419         used = atomic_add_return(count, &q->nr_buf_used) - count;
1420         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1421
1422         /* no need to signal as long as the adapter had free buffers */
1423         if (used)
1424                 return 0;
1425
1426         if (need_siga_in(q))
1427                 return qdio_siga_input(q);
1428         return 0;
1429 }
1430
1431 /**
1432  * handle_outbound - process filled outbound buffers
1433  * @q: queue containing the buffers
1434  * @callflags: flags
1435  * @bufnr: first buffer to process
1436  * @count: how many buffers are filled
1437  */
1438 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1439                            int bufnr, int count)
1440 {
1441         unsigned char state;
1442         int used, rc = 0;
1443
1444         qdio_perf_stat_inc(&perf_stats.outbound_handler);
1445
1446         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1447         used = atomic_add_return(count, &q->nr_buf_used);
1448         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1449
1450         if (callflags & QDIO_FLAG_PCI_OUT)
1451                 q->u.out.pci_out_enabled = 1;
1452         else
1453                 q->u.out.pci_out_enabled = 0;
1454
1455         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1456                 if (multicast_outbound(q))
1457                         rc = qdio_kick_outbound_q(q);
1458                 else
1459                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1460                             (count > 1) &&
1461                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1462                                 /* exploit enhanced SIGA */
1463                                 q->u.out.use_enh_siga = 1;
1464                                 rc = qdio_kick_outbound_q(q);
1465                         } else {
1466                                 /*
1467                                 * One siga-w per buffer required for unicast
1468                                 * HiperSockets.
1469                                 */
1470                                 q->u.out.use_enh_siga = 0;
1471                                 while (count--) {
1472                                         rc = qdio_kick_outbound_q(q);
1473                                         if (rc)
1474                                                 goto out;
1475                                 }
1476                         }
1477                 goto out;
1478         }
1479
1480         if (need_siga_sync(q)) {
1481                 qdio_siga_sync_q(q);
1482                 goto out;
1483         }
1484
1485         /* try to fast requeue buffers */
1486         get_buf_state(q, prev_buf(bufnr), &state, 0);
1487         if (state != SLSB_CU_OUTPUT_PRIMED)
1488                 rc = qdio_kick_outbound_q(q);
1489         else {
1490                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1491                 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1492         }
1493 out:
1494         tasklet_schedule(&q->tasklet);
1495         return rc;
1496 }
1497
1498 /**
1499  * do_QDIO - process input or output buffers
1500  * @cdev: associated ccw_device for the qdio subchannel
1501  * @callflags: input or output and special flags from the program
1502  * @q_nr: queue number
1503  * @bufnr: buffer number
1504  * @count: how many buffers to process
1505  */
1506 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1507             int q_nr, int bufnr, int count)
1508 {
1509         struct qdio_irq *irq_ptr;
1510
1511         if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1512             (count > QDIO_MAX_BUFFERS_PER_Q) ||
1513             (q_nr >= QDIO_MAX_QUEUES_PER_IRQ))
1514                 return -EINVAL;
1515
1516         if (!count)
1517                 return 0;
1518
1519         irq_ptr = cdev->private->qdio_data;
1520         if (!irq_ptr)
1521                 return -ENODEV;
1522
1523         if (callflags & QDIO_FLAG_SYNC_INPUT)
1524                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1525         else
1526                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1527         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1528         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1529
1530         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1531                 return -EBUSY;
1532
1533         if (callflags & QDIO_FLAG_SYNC_INPUT)
1534                 return handle_inbound(irq_ptr->input_qs[q_nr],
1535                                       callflags, bufnr, count);
1536         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1537                 return handle_outbound(irq_ptr->output_qs[q_nr],
1538                                        callflags, bufnr, count);
1539         return -EINVAL;
1540 }
1541 EXPORT_SYMBOL_GPL(do_QDIO);
1542
1543 static int __init init_QDIO(void)
1544 {
1545         int rc;
1546
1547         rc = qdio_setup_init();
1548         if (rc)
1549                 return rc;
1550         rc = tiqdio_allocate_memory();
1551         if (rc)
1552                 goto out_cache;
1553         rc = qdio_debug_init();
1554         if (rc)
1555                 goto out_ti;
1556         rc = qdio_setup_perf_stats();
1557         if (rc)
1558                 goto out_debug;
1559         rc = tiqdio_register_thinints();
1560         if (rc)
1561                 goto out_perf;
1562         return 0;
1563
1564 out_perf:
1565         qdio_remove_perf_stats();
1566 out_debug:
1567         qdio_debug_exit();
1568 out_ti:
1569         tiqdio_free_memory();
1570 out_cache:
1571         qdio_setup_exit();
1572         return rc;
1573 }
1574
1575 static void __exit exit_QDIO(void)
1576 {
1577         tiqdio_unregister_thinints();
1578         tiqdio_free_memory();
1579         qdio_remove_perf_stats();
1580         qdio_debug_exit();
1581         qdio_setup_exit();
1582 }
1583
1584 module_init(init_QDIO);
1585 module_exit(exit_QDIO);