SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/s390/cio/qdio_main.c

   1 /*
   2  * linux/drivers/s390/cio/qdio_main.c
   3  *
   4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   5  *
   6  * Copyright 2000,2008 IBM Corp.
   7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   8  *            Jan Glauber <jang@linux.vnet.ibm.com>
   9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include <asm/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19
  20 #include "cio.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "qdio.h"
  24 #include "qdio_debug.h"
  25 #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:%02x",
 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: %02x", 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         /* need to change ALL buffers to get more interrupts */
 459         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 460 }
 461
 462 static int get_inbound_buffer_frontier(struct qdio_q *q)
 463 {
 464         int count, stop;
 465         unsigned char state;
 466
 467         /*
 468          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 469          * would return 0.
 470          */
 471         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 472         stop = add_buf(q->first_to_check, count);
 473
 474         if (q->first_to_check == stop)
 475                 goto out;
 476
 477         /*
 478          * No siga sync here, as a PCI or we after a thin interrupt
 479          * already sync'ed the queues.
 480          */
 481         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 482         if (!count)
 483                 goto out;
 484
 485         switch (state) {
 486         case SLSB_P_INPUT_PRIMED:
 487                 inbound_primed(q, count);
 488                 q->first_to_check = add_buf(q->first_to_check, count);
 489                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 490                         qdio_perf_stat_inc(&perf_stats.inbound_queue_full);
 491                 break;
 492         case SLSB_P_INPUT_ERROR:
 493                 announce_buffer_error(q, count);
 494                 /* process the buffer, the upper layer will take care of it */
 495                 q->first_to_check = add_buf(q->first_to_check, count);
 496                 atomic_sub(count, &q->nr_buf_used);
 497                 break;
 498         case SLSB_CU_INPUT_EMPTY:
 499         case SLSB_P_INPUT_NOT_INIT:
 500         case SLSB_P_INPUT_ACK:
 501                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 502                 break;
 503         default:
 504                 BUG();
 505         }
 506 out:
 507         return q->first_to_check;
 508 }
 509
 510 static int qdio_inbound_q_moved(struct qdio_q *q)
 511 {
 512         int bufnr;
 513
 514         bufnr = get_inbound_buffer_frontier(q);
 515
 516         if ((bufnr != q->last_move) || q->qdio_error) {
 517                 q->last_move = bufnr;
 518                 if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
 519                         q->u.in.timestamp = get_usecs();
 520                 return 1;
 521         } else
 522                 return 0;
 523 }
 524
 525 static inline int qdio_inbound_q_done(struct qdio_q *q)
 526 {
 527         unsigned char state = 0;
 528
 529         if (!atomic_read(&q->nr_buf_used))
 530                 return 1;
 531
 532         qdio_siga_sync_q(q);
 533         get_buf_state(q, q->first_to_check, &state, 0);
 534
 535         if (state == SLSB_P_INPUT_PRIMED)
 536                 /* more work coming */
 537                 return 0;
 538
 539         if (is_thinint_irq(q->irq_ptr))
 540                 return 1;
 541
 542         /* don't poll under z/VM */
 543         if (MACHINE_IS_VM)
 544                 return 1;
 545
 546         /*
 547          * At this point we know, that inbound first_to_check
 548          * has (probably) not moved (see qdio_inbound_processing).
 549          */
 550         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 551                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 552                               q->first_to_check);
 553                 return 1;
 554         } else
 555                 return 0;
 556 }
 557
 558 static void qdio_kick_handler(struct qdio_q *q)
 559 {
 560         int start = q->first_to_kick;
 561         int end = q->first_to_check;
 562         int count;
 563
 564         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 565                 return;
 566
 567         count = sub_buf(end, start);
 568
 569         if (q->is_input_q) {
 570                 qdio_perf_stat_inc(&perf_stats.inbound_handler);
 571                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 572         } else
 573                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 574                               start, count);
 575
 576         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 577                    q->irq_ptr->int_parm);
 578
 579         /* for the next time */
 580         q->first_to_kick = end;
 581         q->qdio_error = 0;
 582 }
 583
 584 static void __qdio_inbound_processing(struct qdio_q *q)
 585 {
 586         qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
 587 again:
 588         if (!qdio_inbound_q_moved(q))
 589                 return;
 590
 591         qdio_kick_handler(q);
 592
 593         if (!qdio_inbound_q_done(q))
 594                 /* means poll time is not yet over */
 595                 goto again;
 596
 597         qdio_stop_polling(q);
 598         /*
 599          * We need to check again to not lose initiative after
 600          * resetting the ACK state.
 601          */
 602         if (!qdio_inbound_q_done(q))
 603                 goto again;
 604 }
 605
 606 void qdio_inbound_processing(unsigned long data)
 607 {
 608         struct qdio_q *q = (struct qdio_q *)data;
 609         __qdio_inbound_processing(q);
 610 }
 611
 612 static int get_outbound_buffer_frontier(struct qdio_q *q)
 613 {
 614         int count, stop;
 615         unsigned char state;
 616
 617         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 618             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 619                 qdio_siga_sync_q(q);
 620
 621         /*
 622          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 623          * would return 0.
 624          */
 625         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 626         stop = add_buf(q->first_to_check, count);
 627
 628         if (q->first_to_check == stop)
 629                 return q->first_to_check;
 630
 631         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 632         if (!count)
 633                 return q->first_to_check;
 634
 635         switch (state) {
 636         case SLSB_P_OUTPUT_EMPTY:
 637                 /* the adapter got it */
 638                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
 639
 640                 atomic_sub(count, &q->nr_buf_used);
 641                 q->first_to_check = add_buf(q->first_to_check, count);
 642                 break;
 643         case SLSB_P_OUTPUT_ERROR:
 644                 announce_buffer_error(q, count);
 645                 /* process the buffer, the upper layer will take care of it */
 646                 q->first_to_check = add_buf(q->first_to_check, count);
 647                 atomic_sub(count, &q->nr_buf_used);
 648                 break;
 649         case SLSB_CU_OUTPUT_PRIMED:
 650                 /* the adapter has not fetched the output yet */
 651                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 652                 break;
 653         case SLSB_P_OUTPUT_NOT_INIT:
 654         case SLSB_P_OUTPUT_HALTED:
 655                 break;
 656         default:
 657                 BUG();
 658         }
 659         return q->first_to_check;
 660 }
 661
 662 /* all buffers processed? */
 663 static inline int qdio_outbound_q_done(struct qdio_q *q)
 664 {
 665         return atomic_read(&q->nr_buf_used) == 0;
 666 }
 667
 668 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 669 {
 670         int bufnr;
 671
 672         bufnr = get_outbound_buffer_frontier(q);
 673
 674         if ((bufnr != q->last_move) || q->qdio_error) {
 675                 q->last_move = bufnr;
 676                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 677                 return 1;
 678         } else
 679                 return 0;
 680 }
 681
 682 static int qdio_kick_outbound_q(struct qdio_q *q)
 683 {
 684         unsigned int busy_bit;
 685         int cc;
 686
 687         if (!need_siga_out(q))
 688                 return 0;
 689
 690         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 691         qdio_perf_stat_inc(&perf_stats.siga_out);
 692
 693         cc = qdio_siga_output(q, &busy_bit);
 694         switch (cc) {
 695         case 0:
 696                 break;
 697         case 2:
 698                 if (busy_bit) {
 699                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 700                         cc |= QDIO_ERROR_SIGA_BUSY;
 701                 } else
 702                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 703                 break;
 704         case 1:
 705         case 3:
 706                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 707                 break;
 708         }
 709         return cc;
 710 }
 711
 712 static void __qdio_outbound_processing(struct qdio_q *q)
 713 {
 714         qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
 715         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 716
 717         if (qdio_outbound_q_moved(q))
 718                 qdio_kick_handler(q);
 719
 720         if (queue_type(q) == QDIO_ZFCP_QFMT)
 721                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 722                         goto sched;
 723
 724         /* bail out for HiperSockets unicast queues */
 725         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 726                 return;
 727
 728         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 729             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 730                 goto sched;
 731
 732         if (q->u.out.pci_out_enabled)
 733                 return;
 734
 735         /*
 736          * Now we know that queue type is either qeth without pci enabled
 737          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 738          * EMPTY is noticed and outbound_handler is called after some time.
 739          */
 740         if (qdio_outbound_q_done(q))
 741                 del_timer(&q->u.out.timer);
 742         else {
 743                 if (!timer_pending(&q->u.out.timer)) {
 744                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 745                         qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
 746                 }
 747         }
 748         return;
 749
 750 sched:
 751         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 752                 return;
 753         tasklet_schedule(&q->tasklet);
 754 }
 755
 756 /* outbound tasklet */
 757 void qdio_outbound_processing(unsigned long data)
 758 {
 759         struct qdio_q *q = (struct qdio_q *)data;
 760         __qdio_outbound_processing(q);
 761 }
 762
 763 void qdio_outbound_timer(unsigned long data)
 764 {
 765         struct qdio_q *q = (struct qdio_q *)data;
 766
 767         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 768                 return;
 769         tasklet_schedule(&q->tasklet);
 770 }
 771
 772 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 773 {
 774         struct qdio_q *out;
 775         int i;
 776
 777         if (!pci_out_supported(q))
 778                 return;
 779
 780         for_each_output_queue(q->irq_ptr, out, i)
 781                 if (!qdio_outbound_q_done(out))
 782                         tasklet_schedule(&out->tasklet);
 783 }
 784
 785 static void __tiqdio_inbound_processing(struct qdio_q *q)
 786 {
 787         qdio_perf_stat_inc(&perf_stats.thinint_inbound);
 788         qdio_sync_after_thinint(q);
 789
 790         /*
 791          * The interrupt could be caused by a PCI request. Check the
 792          * PCI capable outbound queues.
 793          */
 794         qdio_check_outbound_after_thinint(q);
 795
 796         if (!qdio_inbound_q_moved(q))
 797                 return;
 798
 799         qdio_kick_handler(q);
 800
 801         if (!qdio_inbound_q_done(q)) {
 802                 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop);
 803                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 804                         tasklet_schedule(&q->tasklet);
 805                         return;
 806                 }
 807         }
 808
 809         qdio_stop_polling(q);
 810         /*
 811          * We need to check again to not lose initiative after
 812          * resetting the ACK state.
 813          */
 814         if (!qdio_inbound_q_done(q)) {
 815                 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2);
 816                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 817                         tasklet_schedule(&q->tasklet);
 818         }
 819 }
 820
 821 void tiqdio_inbound_processing(unsigned long data)
 822 {
 823         struct qdio_q *q = (struct qdio_q *)data;
 824         __tiqdio_inbound_processing(q);
 825 }
 826
 827 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 828                                   enum qdio_irq_states state)
 829 {
 830         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 831
 832         irq_ptr->state = state;
 833         mb();
 834 }
 835
 836 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 837 {
 838         if (irb->esw.esw0.erw.cons) {
 839                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 840                 DBF_ERROR_HEX(irb, 64);
 841                 DBF_ERROR_HEX(irb->ecw, 64);
 842         }
 843 }
 844
 845 /* PCI interrupt handler */
 846 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 847 {
 848         int i;
 849         struct qdio_q *q;
 850
 851         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 852                 return;
 853
 854         qdio_perf_stat_inc(&perf_stats.pci_int);
 855
 856         for_each_input_queue(irq_ptr, q, i)
 857                 tasklet_schedule(&q->tasklet);
 858
 859         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 860                 return;
 861
 862         for_each_output_queue(irq_ptr, q, i) {
 863                 if (qdio_outbound_q_done(q))
 864                         continue;
 865
 866                 if (!siga_syncs_out_pci(q))
 867                         qdio_siga_sync_q(q);
 868
 869                 tasklet_schedule(&q->tasklet);
 870         }
 871 }
 872
 873 static void qdio_handle_activate_check(struct ccw_device *cdev,
 874                                 unsigned long intparm, int cstat, int dstat)
 875 {
 876         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 877         struct qdio_q *q;
 878
 879         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 880         DBF_ERROR("intp :%lx", intparm);
 881         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 882
 883         if (irq_ptr->nr_input_qs) {
 884                 q = irq_ptr->input_qs[0];
 885         } else if (irq_ptr->nr_output_qs) {
 886                 q = irq_ptr->output_qs[0];
 887         } else {
 888                 dump_stack();
 889                 goto no_handler;
 890         }
 891         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 892                    0, -1, -1, irq_ptr->int_parm);
 893 no_handler:
 894         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 895 }
 896
 897 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 898                                       int dstat)
 899 {
 900         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 901
 902         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 903
 904         if (cstat)
 905                 goto error;
 906         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 907                 goto error;
 908         if (!(dstat & DEV_STAT_DEV_END))
 909                 goto error;
 910         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 911         return;
 912
 913 error:
 914         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 915         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 916         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 917 }
 918
 919 /* qdio interrupt handler */
 920 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 921                       struct irb *irb)
 922 {
 923         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 924         int cstat, dstat;
 925
 926         qdio_perf_stat_inc(&perf_stats.qdio_int);
 927
 928         if (!intparm || !irq_ptr) {
 929                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 930                 return;
 931         }
 932
 933         if (IS_ERR(irb)) {
 934                 switch (PTR_ERR(irb)) {
 935                 case -EIO:
 936                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 937                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 938                         wake_up(&cdev->private->wait_q);
 939                         return;
 940                 default:
 941                         WARN_ON(1);
 942                         return;
 943                 }
 944         }
 945         qdio_irq_check_sense(irq_ptr, irb);
 946         cstat = irb->scsw.cmd.cstat;
 947         dstat = irb->scsw.cmd.dstat;
 948
 949         switch (irq_ptr->state) {
 950         case QDIO_IRQ_STATE_INACTIVE:
 951                 qdio_establish_handle_irq(cdev, cstat, dstat);
 952                 break;
 953         case QDIO_IRQ_STATE_CLEANUP:
 954                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 955                 break;
 956         case QDIO_IRQ_STATE_ESTABLISHED:
 957         case QDIO_IRQ_STATE_ACTIVE:
 958                 if (cstat & SCHN_STAT_PCI) {
 959                         qdio_int_handler_pci(irq_ptr);
 960                         return;
 961                 }
 962                 if (cstat || dstat)
 963                         qdio_handle_activate_check(cdev, intparm, cstat,
 964                                                    dstat);
 965                 break;
 966         default:
 967                 WARN_ON(1);
 968         }
 969         wake_up(&cdev->private->wait_q);
 970 }
 971
 972 /**
 973  * qdio_get_ssqd_desc - get qdio subchannel description
 974  * @cdev: ccw device to get description for
 975  * @data: where to store the ssqd
 976  *
 977  * Returns 0 or an error code. The results of the chsc are stored in the
 978  * specified structure.
 979  */
 980 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 981                        struct qdio_ssqd_desc *data)
 982 {
 983
 984         if (!cdev || !cdev->private)
 985                 return -EINVAL;
 986
 987         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
 988         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
 989 }
 990 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 991
 992 /**
 993  * qdio_cleanup - shutdown queues and free data structures
 994  * @cdev: associated ccw device
 995  * @how: use halt or clear to shutdown
 996  *
 997  * This function calls qdio_shutdown() for @cdev with method @how.
 998  * and qdio_free(). The qdio_free() return value is ignored since
 999  * !irq_ptr is already checked.
1000  */
1001 int qdio_cleanup(struct ccw_device *cdev, int how)
1002 {
1003         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1004         int rc;
1005
1006         if (!irq_ptr)
1007                 return -ENODEV;
1008
1009         rc = qdio_shutdown(cdev, how);
1010
1011         qdio_free(cdev);
1012         return rc;
1013 }
1014 EXPORT_SYMBOL_GPL(qdio_cleanup);
1015
1016 static void qdio_shutdown_queues(struct ccw_device *cdev)
1017 {
1018         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1019         struct qdio_q *q;
1020         int i;
1021
1022         for_each_input_queue(irq_ptr, q, i)
1023                 tasklet_kill(&q->tasklet);
1024
1025         for_each_output_queue(irq_ptr, q, i) {
1026                 del_timer(&q->u.out.timer);
1027                 tasklet_kill(&q->tasklet);
1028         }
1029 }
1030
1031 /**
1032  * qdio_shutdown - shut down a qdio subchannel
1033  * @cdev: associated ccw device
1034  * @how: use halt or clear to shutdown
1035  */
1036 int qdio_shutdown(struct ccw_device *cdev, int how)
1037 {
1038         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1039         int rc;
1040         unsigned long flags;
1041
1042         if (!irq_ptr)
1043                 return -ENODEV;
1044
1045         BUG_ON(irqs_disabled());
1046         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1047
1048         mutex_lock(&irq_ptr->setup_mutex);
1049         /*
1050          * Subchannel was already shot down. We cannot prevent being called
1051          * twice since cio may trigger a shutdown asynchronously.
1052          */
1053         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1054                 mutex_unlock(&irq_ptr->setup_mutex);
1055                 return 0;
1056         }
1057
1058         /*
1059          * Indicate that the device is going down. Scheduling the queue
1060          * tasklets is forbidden from here on.
1061          */
1062         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1063
1064         tiqdio_remove_input_queues(irq_ptr);
1065         qdio_shutdown_queues(cdev);
1066         qdio_shutdown_debug_entries(irq_ptr, cdev);
1067
1068         /* cleanup subchannel */
1069         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1070
1071         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1072                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1073         else
1074                 /* default behaviour is halt */
1075                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1076         if (rc) {
1077                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1078                 DBF_ERROR("rc:%4d", rc);
1079                 goto no_cleanup;
1080         }
1081
1082         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1083         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1084         wait_event_interruptible_timeout(cdev->private->wait_q,
1085                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1086                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1087                 10 * HZ);
1088         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1089
1090 no_cleanup:
1091         qdio_shutdown_thinint(irq_ptr);
1092
1093         /* restore interrupt handler */
1094         if ((void *)cdev->handler == (void *)qdio_int_handler)
1095                 cdev->handler = irq_ptr->orig_handler;
1096         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1097
1098         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1099         mutex_unlock(&irq_ptr->setup_mutex);
1100         if (rc)
1101                 return rc;
1102         return 0;
1103 }
1104 EXPORT_SYMBOL_GPL(qdio_shutdown);
1105
1106 /**
1107  * qdio_free - free data structures for a qdio subchannel
1108  * @cdev: associated ccw device
1109  */
1110 int qdio_free(struct ccw_device *cdev)
1111 {
1112         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1113
1114         if (!irq_ptr)
1115                 return -ENODEV;
1116
1117         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1118         mutex_lock(&irq_ptr->setup_mutex);
1119
1120         if (irq_ptr->debug_area != NULL) {
1121                 debug_unregister(irq_ptr->debug_area);
1122                 irq_ptr->debug_area = NULL;
1123         }
1124         cdev->private->qdio_data = NULL;
1125         mutex_unlock(&irq_ptr->setup_mutex);
1126
1127         qdio_release_memory(irq_ptr);
1128         return 0;
1129 }
1130 EXPORT_SYMBOL_GPL(qdio_free);
1131
1132 /**
1133  * qdio_initialize - allocate and establish queues for a qdio subchannel
1134  * @init_data: initialization data
1135  *
1136  * This function first allocates queues via qdio_allocate() and on success
1137  * establishes them via qdio_establish().
1138  */
1139 int qdio_initialize(struct qdio_initialize *init_data)
1140 {
1141         int rc;
1142
1143         rc = qdio_allocate(init_data);
1144         if (rc)
1145                 return rc;
1146
1147         rc = qdio_establish(init_data);
1148         if (rc)
1149                 qdio_free(init_data->cdev);
1150         return rc;
1151 }
1152 EXPORT_SYMBOL_GPL(qdio_initialize);
1153
1154 /**
1155  * qdio_allocate - allocate qdio queues and associated data
1156  * @init_data: initialization data
1157  */
1158 int qdio_allocate(struct qdio_initialize *init_data)
1159 {
1160         struct qdio_irq *irq_ptr;
1161
1162         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1163
1164         if ((init_data->no_input_qs && !init_data->input_handler) ||
1165             (init_data->no_output_qs && !init_data->output_handler))
1166                 return -EINVAL;
1167
1168         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1169             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1170                 return -EINVAL;
1171
1172         if ((!init_data->input_sbal_addr_array) ||
1173             (!init_data->output_sbal_addr_array))
1174                 return -EINVAL;
1175
1176         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1177         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1178         if (!irq_ptr)
1179                 goto out_err;
1180
1181         mutex_init(&irq_ptr->setup_mutex);
1182         qdio_allocate_dbf(init_data, irq_ptr);
1183
1184         /*
1185          * Allocate a page for the chsc calls in qdio_establish.
1186          * Must be pre-allocated since a zfcp recovery will call
1187          * qdio_establish. In case of low memory and swap on a zfcp disk
1188          * we may not be able to allocate memory otherwise.
1189          */
1190         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1191         if (!irq_ptr->chsc_page)
1192                 goto out_rel;
1193
1194         /* qdr is used in ccw1.cda which is u32 */
1195         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1196         if (!irq_ptr->qdr)
1197                 goto out_rel;
1198         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1199
1200         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1201                              init_data->no_output_qs))
1202                 goto out_rel;
1203
1204         init_data->cdev->private->qdio_data = irq_ptr;
1205         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1206         return 0;
1207 out_rel:
1208         qdio_release_memory(irq_ptr);
1209 out_err:
1210         return -ENOMEM;
1211 }
1212 EXPORT_SYMBOL_GPL(qdio_allocate);
1213
1214 /**
1215  * qdio_establish - establish queues on a qdio subchannel
1216  * @init_data: initialization data
1217  */
1218 int qdio_establish(struct qdio_initialize *init_data)
1219 {
1220         struct qdio_irq *irq_ptr;
1221         struct ccw_device *cdev = init_data->cdev;
1222         unsigned long saveflags;
1223         int rc;
1224
1225         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1226
1227         irq_ptr = cdev->private->qdio_data;
1228         if (!irq_ptr)
1229                 return -ENODEV;
1230
1231         if (cdev->private->state != DEV_STATE_ONLINE)
1232                 return -EINVAL;
1233
1234         mutex_lock(&irq_ptr->setup_mutex);
1235         qdio_setup_irq(init_data);
1236
1237         rc = qdio_establish_thinint(irq_ptr);
1238         if (rc) {
1239                 mutex_unlock(&irq_ptr->setup_mutex);
1240                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1241                 return rc;
1242         }
1243
1244         /* establish q */
1245         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1246         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1247         irq_ptr->ccw.count = irq_ptr->equeue.count;
1248         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1249
1250         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1251         ccw_device_set_options_mask(cdev, 0);
1252
1253         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1254         if (rc) {
1255                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1256                 DBF_ERROR("rc:%4x", rc);
1257         }
1258         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1259
1260         if (rc) {
1261                 mutex_unlock(&irq_ptr->setup_mutex);
1262                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1263                 return rc;
1264         }
1265
1266         wait_event_interruptible_timeout(cdev->private->wait_q,
1267                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1268                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1269
1270         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1271                 mutex_unlock(&irq_ptr->setup_mutex);
1272                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1273                 return -EIO;
1274         }
1275
1276         qdio_setup_ssqd_info(irq_ptr);
1277         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1278         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1279
1280         /* qebsm is now setup if available, initialize buffer states */
1281         qdio_init_buf_states(irq_ptr);
1282
1283         mutex_unlock(&irq_ptr->setup_mutex);
1284         qdio_print_subchannel_info(irq_ptr, cdev);
1285         qdio_setup_debug_entries(irq_ptr, cdev);
1286         return 0;
1287 }
1288 EXPORT_SYMBOL_GPL(qdio_establish);
1289
1290 /**
1291  * qdio_activate - activate queues on a qdio subchannel
1292  * @cdev: associated cdev
1293  */
1294 int qdio_activate(struct ccw_device *cdev)
1295 {
1296         struct qdio_irq *irq_ptr;
1297         int rc;
1298         unsigned long saveflags;
1299
1300         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1301
1302         irq_ptr = cdev->private->qdio_data;
1303         if (!irq_ptr)
1304                 return -ENODEV;
1305
1306         if (cdev->private->state != DEV_STATE_ONLINE)
1307                 return -EINVAL;
1308
1309         mutex_lock(&irq_ptr->setup_mutex);
1310         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1311                 rc = -EBUSY;
1312                 goto out;
1313         }
1314
1315         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1316         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1317         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1318         irq_ptr->ccw.cda = 0;
1319
1320         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1321         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1322
1323         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1324                               0, DOIO_DENY_PREFETCH);
1325         if (rc) {
1326                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1327                 DBF_ERROR("rc:%4x", rc);
1328         }
1329         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1330
1331         if (rc)
1332                 goto out;
1333
1334         if (is_thinint_irq(irq_ptr))
1335                 tiqdio_add_input_queues(irq_ptr);
1336
1337         /* wait for subchannel to become active */
1338         msleep(5);
1339
1340         switch (irq_ptr->state) {
1341         case QDIO_IRQ_STATE_STOPPED:
1342         case QDIO_IRQ_STATE_ERR:
1343                 rc = -EIO;
1344                 break;
1345         default:
1346                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1347                 rc = 0;
1348         }
1349 out:
1350         mutex_unlock(&irq_ptr->setup_mutex);
1351         return rc;
1352 }
1353 EXPORT_SYMBOL_GPL(qdio_activate);
1354
1355 static inline int buf_in_between(int bufnr, int start, int count)
1356 {
1357         int end = add_buf(start, count);
1358
1359         if (end > start) {
1360                 if (bufnr >= start && bufnr < end)
1361                         return 1;
1362                 else
1363                         return 0;
1364         }
1365
1366         /* wrap-around case */
1367         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1368             (bufnr < end))
1369                 return 1;
1370         else
1371                 return 0;
1372 }
1373
1374 /**
1375  * handle_inbound - reset processed input buffers
1376  * @q: queue containing the buffers
1377  * @callflags: flags
1378  * @bufnr: first buffer to process
1379  * @count: how many buffers are emptied
1380  */
1381 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1382                           int bufnr, int count)
1383 {
1384         int used, diff;
1385
1386         if (!q->u.in.polling)
1387                 goto set;
1388
1389         /* protect against stop polling setting an ACK for an emptied slsb */
1390         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1391                 /* overwriting everything, just delete polling status */
1392                 q->u.in.polling = 0;
1393                 q->u.in.ack_count = 0;
1394                 goto set;
1395         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1396                 if (is_qebsm(q)) {
1397                         /* partial overwrite, just update ack_start */
1398                         diff = add_buf(bufnr, count);
1399                         diff = sub_buf(diff, q->u.in.ack_start);
1400                         q->u.in.ack_count -= diff;
1401                         if (q->u.in.ack_count <= 0) {
1402                                 q->u.in.polling = 0;
1403                                 q->u.in.ack_count = 0;
1404                                 goto set;
1405                         }
1406                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1407                 }
1408                 else
1409                         /* the only ACK will be deleted, so stop polling */
1410                         q->u.in.polling = 0;
1411         }
1412
1413 set:
1414         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1415
1416         used = atomic_add_return(count, &q->nr_buf_used) - count;
1417         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1418
1419         /* no need to signal as long as the adapter had free buffers */
1420         if (used)
1421                 return 0;
1422
1423         if (need_siga_in(q))
1424                 return qdio_siga_input(q);
1425         return 0;
1426 }
1427
1428 /**
1429  * handle_outbound - process filled outbound buffers
1430  * @q: queue containing the buffers
1431  * @callflags: flags
1432  * @bufnr: first buffer to process
1433  * @count: how many buffers are filled
1434  */
1435 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1436                            int bufnr, int count)
1437 {
1438         unsigned char state;
1439         int used, rc = 0;
1440
1441         qdio_perf_stat_inc(&perf_stats.outbound_handler);
1442
1443         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1444         used = atomic_add_return(count, &q->nr_buf_used);
1445         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1446
1447         if (callflags & QDIO_FLAG_PCI_OUT)
1448                 q->u.out.pci_out_enabled = 1;
1449         else
1450                 q->u.out.pci_out_enabled = 0;
1451
1452         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1453                 if (multicast_outbound(q))
1454                         rc = qdio_kick_outbound_q(q);
1455                 else
1456                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1457                             (count > 1) &&
1458                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1459                                 /* exploit enhanced SIGA */
1460                                 q->u.out.use_enh_siga = 1;
1461                                 rc = qdio_kick_outbound_q(q);
1462                         } else {
1463                                 /*
1464                                 * One siga-w per buffer required for unicast
1465                                 * HiperSockets.
1466                                 */
1467                                 q->u.out.use_enh_siga = 0;
1468                                 while (count--) {
1469                                         rc = qdio_kick_outbound_q(q);
1470                                         if (rc)
1471                                                 goto out;
1472                                 }
1473                         }
1474                 goto out;
1475         }
1476
1477         if (need_siga_sync(q)) {
1478                 qdio_siga_sync_q(q);
1479                 goto out;
1480         }
1481
1482         /* try to fast requeue buffers */
1483         get_buf_state(q, prev_buf(bufnr), &state, 0);
1484         if (state != SLSB_CU_OUTPUT_PRIMED)
1485                 rc = qdio_kick_outbound_q(q);
1486         else
1487                 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1488
1489 out:
1490         tasklet_schedule(&q->tasklet);
1491         return rc;
1492 }
1493
1494 /**
1495  * do_QDIO - process input or output buffers
1496  * @cdev: associated ccw_device for the qdio subchannel
1497  * @callflags: input or output and special flags from the program
1498  * @q_nr: queue number
1499  * @bufnr: buffer number
1500  * @count: how many buffers to process
1501  */
1502 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1503             int q_nr, unsigned int bufnr, unsigned int count)
1504 {
1505         struct qdio_irq *irq_ptr;
1506
1507         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1508                 return -EINVAL;
1509
1510         irq_ptr = cdev->private->qdio_data;
1511         if (!irq_ptr)
1512                 return -ENODEV;
1513
1514         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1515                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1516
1517         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1518                 return -EBUSY;
1519
1520         if (callflags & QDIO_FLAG_SYNC_INPUT)
1521                 return handle_inbound(irq_ptr->input_qs[q_nr],
1522                                       callflags, bufnr, count);
1523         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1524                 return handle_outbound(irq_ptr->output_qs[q_nr],
1525                                        callflags, bufnr, count);
1526         return -EINVAL;
1527 }
1528 EXPORT_SYMBOL_GPL(do_QDIO);
1529
1530 static int __init init_QDIO(void)
1531 {
1532         int rc;
1533
1534         rc = qdio_setup_init();
1535         if (rc)
1536                 return rc;
1537         rc = tiqdio_allocate_memory();
1538         if (rc)
1539                 goto out_cache;
1540         rc = qdio_debug_init();
1541         if (rc)
1542                 goto out_ti;
1543         rc = qdio_setup_perf_stats();
1544         if (rc)
1545                 goto out_debug;
1546         rc = tiqdio_register_thinints();
1547         if (rc)
1548                 goto out_perf;
1549         return 0;
1550
1551 out_perf:
1552         qdio_remove_perf_stats();
1553 out_debug:
1554         qdio_debug_exit();
1555 out_ti:
1556         tiqdio_free_memory();
1557 out_cache:
1558         qdio_setup_exit();
1559         return rc;
1560 }
1561
1562 static void __exit exit_QDIO(void)
1563 {
1564         tiqdio_unregister_thinints();
1565         tiqdio_free_memory();
1566         qdio_remove_perf_stats();
1567         qdio_debug_exit();
1568         qdio_setup_exit();
1569 }
1570
1571 module_init(init_QDIO);
1572 module_exit(exit_QDIO);