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