drivers/s390/cio/qdio_main.c

   1 /*
   2  * linux/drivers/s390/cio/qdio_main.c
   3  *
   4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   5  *
   6  * Copyright 2000,2008 IBM Corp.
   7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   8  *            Jan Glauber <jang@linux.vnet.ibm.com>
   9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include <asm/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19
  20 #include "cio.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "qdio.h"
  24 #include "qdio_debug.h"
  25
  26 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  27         "Jan Glauber <jang@linux.vnet.ibm.com>");
  28 MODULE_DESCRIPTION("QDIO base support");
  29 MODULE_LICENSE("GPL");
  30
  31 static inline int do_siga_sync(struct subchannel_id schid,
  32                                unsigned int out_mask, unsigned int in_mask)
  33 {
  34         register unsigned long __fc asm ("0") = 2;
  35         register struct subchannel_id __schid asm ("1") = schid;
  36         register unsigned long out asm ("2") = out_mask;
  37         register unsigned long in asm ("3") = in_mask;
  38         int cc;
  39
  40         asm volatile(
  41                 "       siga    0\n"
  42                 "       ipm     %0\n"
  43                 "       srl     %0,28\n"
  44                 : "=d" (cc)
  45                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  46         return cc;
  47 }
  48
  49 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
  50 {
  51         register unsigned long __fc asm ("0") = 1;
  52         register struct subchannel_id __schid asm ("1") = schid;
  53         register unsigned long __mask asm ("2") = mask;
  54         int cc;
  55
  56         asm volatile(
  57                 "       siga    0\n"
  58                 "       ipm     %0\n"
  59                 "       srl     %0,28\n"
  60                 : "=d" (cc)
  61                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  62         return cc;
  63 }
  64
  65 /**
  66  * do_siga_output - perform SIGA-w/wt function
  67  * @schid: subchannel id or in case of QEBSM the subchannel token
  68  * @mask: which output queues to process
  69  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  70  * @fc: function code to perform
  71  *
  72  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
  73  * Note: For IQDC unicast queues only the highest priority queue is processed.
  74  */
  75 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  76                                  unsigned int *bb, unsigned int fc)
  77 {
  78         register unsigned long __fc asm("0") = fc;
  79         register unsigned long __schid asm("1") = schid;
  80         register unsigned long __mask asm("2") = mask;
  81         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  82
  83         asm volatile(
  84                 "       siga    0\n"
  85                 "0:     ipm     %0\n"
  86                 "       srl     %0,28\n"
  87                 "1:\n"
  88                 EX_TABLE(0b, 1b)
  89                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
  90                 : : "cc", "memory");
  91         *bb = ((unsigned int) __fc) >> 31;
  92         return cc;
  93 }
  94
  95 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
  96 {
  97         /* all done or next buffer state different */
  98         if (ccq == 0 || ccq == 32)
  99                 return 0;
 100         /* not all buffers processed */
 101         if (ccq == 96 || ccq == 97)
 102                 return 1;
 103         /* notify devices immediately */
 104         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 105         return -EIO;
 106 }
 107
 108 /**
 109  * qdio_do_eqbs - extract buffer states for QEBSM
 110  * @q: queue to manipulate
 111  * @state: state of the extracted buffers
 112  * @start: buffer number to start at
 113  * @count: count of buffers to examine
 114  * @auto_ack: automatically acknowledge buffers
 115  *
 116  * Returns the number of successfully extracted equal buffer states.
 117  * Stops processing if a state is different from the last buffers state.
 118  */
 119 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 120                         int start, int count, int auto_ack)
 121 {
 122         unsigned int ccq = 0;
 123         int tmp_count = count, tmp_start = start;
 124         int nr = q->nr;
 125         int rc;
 126
 127         BUG_ON(!q->irq_ptr->sch_token);
 128         qperf_inc(q, eqbs);
 129
 130         if (!q->is_input_q)
 131                 nr += q->irq_ptr->nr_input_qs;
 132 again:
 133         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 134                       auto_ack);
 135         rc = qdio_check_ccq(q, ccq);
 136
 137         /* At least one buffer was processed, return and extract the remaining
 138          * buffers later.
 139          */
 140         if ((ccq == 96) && (count != tmp_count)) {
 141                 qperf_inc(q, eqbs_partial);
 142                 return (count - tmp_count);
 143         }
 144
 145         if (rc == 1) {
 146                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 147                 goto again;
 148         }
 149
 150         if (rc < 0) {
 151                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 152                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 153                 q->handler(q->irq_ptr->cdev,
 154                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 155                            0, -1, -1, q->irq_ptr->int_parm);
 156                 return 0;
 157         }
 158         return count - tmp_count;
 159 }
 160
 161 /**
 162  * qdio_do_sqbs - set buffer states for QEBSM
 163  * @q: queue to manipulate
 164  * @state: new state of the buffers
 165  * @start: first buffer number to change
 166  * @count: how many buffers to change
 167  *
 168  * Returns the number of successfully changed buffers.
 169  * Does retrying until the specified count of buffer states is set or an
 170  * error occurs.
 171  */
 172 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 173                         int count)
 174 {
 175         unsigned int ccq = 0;
 176         int tmp_count = count, tmp_start = start;
 177         int nr = q->nr;
 178         int rc;
 179
 180         if (!count)
 181                 return 0;
 182
 183         BUG_ON(!q->irq_ptr->sch_token);
 184         qperf_inc(q, sqbs);
 185
 186         if (!q->is_input_q)
 187                 nr += q->irq_ptr->nr_input_qs;
 188 again:
 189         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 190         rc = qdio_check_ccq(q, ccq);
 191         if (rc == 1) {
 192                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 193                 qperf_inc(q, sqbs_partial);
 194                 goto again;
 195         }
 196         if (rc < 0) {
 197                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 198                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 199                 q->handler(q->irq_ptr->cdev,
 200                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 201                            0, -1, -1, q->irq_ptr->int_parm);
 202                 return 0;
 203         }
 204         WARN_ON(tmp_count);
 205         return count - tmp_count;
 206 }
 207
 208 /* returns number of examined buffers and their common state in *state */
 209 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 210                                  unsigned char *state, unsigned int count,
 211                                  int auto_ack)
 212 {
 213         unsigned char __state = 0;
 214         int i;
 215
 216         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 217         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 218
 219         if (is_qebsm(q))
 220                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 221
 222         for (i = 0; i < count; i++) {
 223                 if (!__state)
 224                         __state = q->slsb.val[bufnr];
 225                 else if (q->slsb.val[bufnr] != __state)
 226                         break;
 227                 bufnr = next_buf(bufnr);
 228         }
 229         *state = __state;
 230         return i;
 231 }
 232
 233 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 234                                 unsigned char *state, int auto_ack)
 235 {
 236         return get_buf_states(q, bufnr, state, 1, auto_ack);
 237 }
 238
 239 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 240 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 241                                  unsigned char state, int count)
 242 {
 243         int i;
 244
 245         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 246         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 247
 248         if (is_qebsm(q))
 249                 return qdio_do_sqbs(q, state, bufnr, count);
 250
 251         for (i = 0; i < count; i++) {
 252                 xchg(&q->slsb.val[bufnr], state);
 253                 bufnr = next_buf(bufnr);
 254         }
 255         return count;
 256 }
 257
 258 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 259                                 unsigned char state)
 260 {
 261         return set_buf_states(q, bufnr, state, 1);
 262 }
 263
 264 /* set slsb states to initial state */
 265 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 266 {
 267         struct qdio_q *q;
 268         int i;
 269
 270         for_each_input_queue(irq_ptr, q, i)
 271                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 272                                QDIO_MAX_BUFFERS_PER_Q);
 273         for_each_output_queue(irq_ptr, q, i)
 274                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 275                                QDIO_MAX_BUFFERS_PER_Q);
 276 }
 277
 278 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 279                           unsigned int input)
 280 {
 281         int cc;
 282
 283         if (!need_siga_sync(q))
 284                 return 0;
 285
 286         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 287         qperf_inc(q, siga_sync);
 288
 289         cc = do_siga_sync(q->irq_ptr->schid, output, input);
 290         if (cc)
 291                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 292         return cc;
 293 }
 294
 295 static inline int qdio_siga_sync_q(struct qdio_q *q)
 296 {
 297         if (q->is_input_q)
 298                 return qdio_siga_sync(q, 0, q->mask);
 299         else
 300                 return qdio_siga_sync(q, q->mask, 0);
 301 }
 302
 303 static inline int qdio_siga_sync_out(struct qdio_q *q)
 304 {
 305         return qdio_siga_sync(q, ~0U, 0);
 306 }
 307
 308 static inline int qdio_siga_sync_all(struct qdio_q *q)
 309 {
 310         return qdio_siga_sync(q, ~0U, ~0U);
 311 }
 312
 313 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 314 {
 315         unsigned long schid;
 316         unsigned int fc = 0;
 317         u64 start_time = 0;
 318         int cc;
 319
 320         if (q->u.out.use_enh_siga)
 321                 fc = 3;
 322
 323         if (is_qebsm(q)) {
 324                 schid = q->irq_ptr->sch_token;
 325                 fc |= 0x80;
 326         }
 327         else
 328                 schid = *((u32 *)&q->irq_ptr->schid);
 329
 330 again:
 331         cc = do_siga_output(schid, q->mask, busy_bit, fc);
 332
 333         /* hipersocket busy condition */
 334         if (*busy_bit) {
 335                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 336
 337                 if (!start_time) {
 338                         start_time = get_usecs();
 339                         goto again;
 340                 }
 341                 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 342                         goto again;
 343         }
 344         return cc;
 345 }
 346
 347 static inline int qdio_siga_input(struct qdio_q *q)
 348 {
 349         int cc;
 350
 351         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 352         qperf_inc(q, siga_read);
 353
 354         cc = do_siga_input(q->irq_ptr->schid, q->mask);
 355         if (cc)
 356                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 357         return cc;
 358 }
 359
 360 static inline void qdio_sync_after_thinint(struct qdio_q *q)
 361 {
 362         if (pci_out_supported(q)) {
 363                 if (need_siga_sync_thinint(q))
 364                         qdio_siga_sync_all(q);
 365                 else if (need_siga_sync_out_thinint(q))
 366                         qdio_siga_sync_out(q);
 367         } else
 368                 qdio_siga_sync_q(q);
 369 }
 370
 371 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 372                         unsigned char *state)
 373 {
 374         qdio_siga_sync_q(q);
 375         return get_buf_states(q, bufnr, state, 1, 0);
 376 }
 377
 378 static inline void qdio_stop_polling(struct qdio_q *q)
 379 {
 380         if (!q->u.in.polling)
 381                 return;
 382
 383         q->u.in.polling = 0;
 384         qperf_inc(q, stop_polling);
 385
 386         /* show the card that we are not polling anymore */
 387         if (is_qebsm(q)) {
 388                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 389                                q->u.in.ack_count);
 390                 q->u.in.ack_count = 0;
 391         } else
 392                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 393 }
 394
 395 static inline void account_sbals(struct qdio_q *q, int count)
 396 {
 397         int pos = 0;
 398
 399         q->q_stats.nr_sbal_total += count;
 400         if (count == QDIO_MAX_BUFFERS_MASK) {
 401                 q->q_stats.nr_sbals[7]++;
 402                 return;
 403         }
 404         while (count >>= 1)
 405                 pos++;
 406         q->q_stats.nr_sbals[pos]++;
 407 }
 408
 409 static void announce_buffer_error(struct qdio_q *q, int count)
 410 {
 411         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 412
 413         /* special handling for no target buffer empty */
 414         if ((!q->is_input_q &&
 415             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 416                 qperf_inc(q, target_full);
 417                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 418                               q->first_to_check);
 419                 return;
 420         }
 421
 422         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 423         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 424         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 425         DBF_ERROR("F14:%2x F15:%2x",
 426                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 427                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 428 }
 429
 430 static inline void inbound_primed(struct qdio_q *q, int count)
 431 {
 432         int new;
 433
 434         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 435
 436         /* for QEBSM the ACK was already set by EQBS */
 437         if (is_qebsm(q)) {
 438                 if (!q->u.in.polling) {
 439                         q->u.in.polling = 1;
 440                         q->u.in.ack_count = count;
 441                         q->u.in.ack_start = q->first_to_check;
 442                         return;
 443                 }
 444
 445                 /* delete the previous ACK's */
 446                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 447                                q->u.in.ack_count);
 448                 q->u.in.ack_count = count;
 449                 q->u.in.ack_start = q->first_to_check;
 450                 return;
 451         }
 452
 453         /*
 454          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 455          * or by the next inbound run.
 456          */
 457         new = add_buf(q->first_to_check, count - 1);
 458         if (q->u.in.polling) {
 459                 /* reset the previous ACK but first set the new one */
 460                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 461                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 462         } else {
 463                 q->u.in.polling = 1;
 464                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 465         }
 466
 467         q->u.in.ack_start = new;
 468         count--;
 469         if (!count)
 470                 return;
 471         /* need to change ALL buffers to get more interrupts */
 472         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 473 }
 474
 475 static int get_inbound_buffer_frontier(struct qdio_q *q)
 476 {
 477         int count, stop;
 478         unsigned char state;
 479
 480         /*
 481          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 482          * would return 0.
 483          */
 484         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 485         stop = add_buf(q->first_to_check, count);
 486
 487         if (q->first_to_check == stop)
 488                 goto out;
 489
 490         /*
 491          * No siga sync here, as a PCI or we after a thin interrupt
 492          * already sync'ed the queues.
 493          */
 494         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 495         if (!count)
 496                 goto out;
 497
 498         switch (state) {
 499         case SLSB_P_INPUT_PRIMED:
 500                 inbound_primed(q, count);
 501                 q->first_to_check = add_buf(q->first_to_check, count);
 502                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 503                         qperf_inc(q, inbound_queue_full);
 504                 if (q->irq_ptr->perf_stat_enabled)
 505                         account_sbals(q, count);
 506                 break;
 507         case SLSB_P_INPUT_ERROR:
 508                 announce_buffer_error(q, count);
 509                 /* process the buffer, the upper layer will take care of it */
 510                 q->first_to_check = add_buf(q->first_to_check, count);
 511                 atomic_sub(count, &q->nr_buf_used);
 512                 if (q->irq_ptr->perf_stat_enabled)
 513                         account_sbals_error(q, count);
 514                 break;
 515         case SLSB_CU_INPUT_EMPTY:
 516         case SLSB_P_INPUT_NOT_INIT:
 517         case SLSB_P_INPUT_ACK:
 518                 if (q->irq_ptr->perf_stat_enabled)
 519                         q->q_stats.nr_sbal_nop++;
 520                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 521                 break;
 522         default:
 523                 BUG();
 524         }
 525 out:
 526         return q->first_to_check;
 527 }
 528
 529 static int qdio_inbound_q_moved(struct qdio_q *q)
 530 {
 531         int bufnr;
 532
 533         bufnr = get_inbound_buffer_frontier(q);
 534
 535         if ((bufnr != q->last_move) || q->qdio_error) {
 536                 q->last_move = bufnr;
 537                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 538                         q->u.in.timestamp = get_usecs();
 539                 return 1;
 540         } else
 541                 return 0;
 542 }
 543
 544 static inline int qdio_inbound_q_done(struct qdio_q *q)
 545 {
 546         unsigned char state = 0;
 547
 548         if (!atomic_read(&q->nr_buf_used))
 549                 return 1;
 550
 551         qdio_siga_sync_q(q);
 552         get_buf_state(q, q->first_to_check, &state, 0);
 553
 554         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 555                 /* more work coming */
 556                 return 0;
 557
 558         if (is_thinint_irq(q->irq_ptr))
 559                 return 1;
 560
 561         /* don't poll under z/VM */
 562         if (MACHINE_IS_VM)
 563                 return 1;
 564
 565         /*
 566          * At this point we know, that inbound first_to_check
 567          * has (probably) not moved (see qdio_inbound_processing).
 568          */
 569         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 570                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 571                               q->first_to_check);
 572                 return 1;
 573         } else
 574                 return 0;
 575 }
 576
 577 static void qdio_kick_handler(struct qdio_q *q)
 578 {
 579         int start = q->first_to_kick;
 580         int end = q->first_to_check;
 581         int count;
 582
 583         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 584                 return;
 585
 586         count = sub_buf(end, start);
 587
 588         if (q->is_input_q) {
 589                 qperf_inc(q, inbound_handler);
 590                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 591         } else
 592                 qperf_inc(q, outbound_handler);
 593                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 594                               start, count);
 595
 596         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 597                    q->irq_ptr->int_parm);
 598
 599         /* for the next time */
 600         q->first_to_kick = end;
 601         q->qdio_error = 0;
 602 }
 603
 604 static void __qdio_inbound_processing(struct qdio_q *q)
 605 {
 606         qperf_inc(q, tasklet_inbound);
 607 again:
 608         if (!qdio_inbound_q_moved(q))
 609                 return;
 610
 611         qdio_kick_handler(q);
 612
 613         if (!qdio_inbound_q_done(q)) {
 614                 /* means poll time is not yet over */
 615                 qperf_inc(q, tasklet_inbound_resched);
 616                 goto again;
 617         }
 618
 619         qdio_stop_polling(q);
 620         /*
 621          * We need to check again to not lose initiative after
 622          * resetting the ACK state.
 623          */
 624         if (!qdio_inbound_q_done(q)) {
 625                 qperf_inc(q, tasklet_inbound_resched2);
 626                 goto again;
 627         }
 628 }
 629
 630 void qdio_inbound_processing(unsigned long data)
 631 {
 632         struct qdio_q *q = (struct qdio_q *)data;
 633         __qdio_inbound_processing(q);
 634 }
 635
 636 static int get_outbound_buffer_frontier(struct qdio_q *q)
 637 {
 638         int count, stop;
 639         unsigned char state;
 640
 641         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 642             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 643                 qdio_siga_sync_q(q);
 644
 645         /*
 646          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 647          * would return 0.
 648          */
 649         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 650         stop = add_buf(q->first_to_check, count);
 651
 652         if (q->first_to_check == stop)
 653                 return q->first_to_check;
 654
 655         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 656         if (!count)
 657                 return q->first_to_check;
 658
 659         switch (state) {
 660         case SLSB_P_OUTPUT_EMPTY:
 661                 /* the adapter got it */
 662                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
 663
 664                 atomic_sub(count, &q->nr_buf_used);
 665                 q->first_to_check = add_buf(q->first_to_check, count);
 666                 if (q->irq_ptr->perf_stat_enabled)
 667                         account_sbals(q, count);
 668                 break;
 669         case SLSB_P_OUTPUT_ERROR:
 670                 announce_buffer_error(q, count);
 671                 /* process the buffer, the upper layer will take care of it */
 672                 q->first_to_check = add_buf(q->first_to_check, count);
 673                 atomic_sub(count, &q->nr_buf_used);
 674                 if (q->irq_ptr->perf_stat_enabled)
 675                         account_sbals_error(q, count);
 676                 break;
 677         case SLSB_CU_OUTPUT_PRIMED:
 678                 /* the adapter has not fetched the output yet */
 679                 if (q->irq_ptr->perf_stat_enabled)
 680                         q->q_stats.nr_sbal_nop++;
 681                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 682                 break;
 683         case SLSB_P_OUTPUT_NOT_INIT:
 684         case SLSB_P_OUTPUT_HALTED:
 685                 break;
 686         default:
 687                 BUG();
 688         }
 689         return q->first_to_check;
 690 }
 691
 692 /* all buffers processed? */
 693 static inline int qdio_outbound_q_done(struct qdio_q *q)
 694 {
 695         return atomic_read(&q->nr_buf_used) == 0;
 696 }
 697
 698 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 699 {
 700         int bufnr;
 701
 702         bufnr = get_outbound_buffer_frontier(q);
 703
 704         if ((bufnr != q->last_move) || q->qdio_error) {
 705                 q->last_move = bufnr;
 706                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 707                 return 1;
 708         } else
 709                 return 0;
 710 }
 711
 712 static int qdio_kick_outbound_q(struct qdio_q *q)
 713 {
 714         unsigned int busy_bit;
 715         int cc;
 716
 717         if (!need_siga_out(q))
 718                 return 0;
 719
 720         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 721         qperf_inc(q, siga_write);
 722
 723         cc = qdio_siga_output(q, &busy_bit);
 724         switch (cc) {
 725         case 0:
 726                 break;
 727         case 2:
 728                 if (busy_bit) {
 729                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 730                         cc |= QDIO_ERROR_SIGA_BUSY;
 731                 } else
 732                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 733                 break;
 734         case 1:
 735         case 3:
 736                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 737                 break;
 738         }
 739         return cc;
 740 }
 741
 742 static void __qdio_outbound_processing(struct qdio_q *q)
 743 {
 744         qperf_inc(q, tasklet_outbound);
 745         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 746
 747         if (qdio_outbound_q_moved(q))
 748                 qdio_kick_handler(q);
 749
 750         if (queue_type(q) == QDIO_ZFCP_QFMT)
 751                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 752                         goto sched;
 753
 754         /* bail out for HiperSockets unicast queues */
 755         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 756                 return;
 757
 758         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 759             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 760                 goto sched;
 761
 762         if (q->u.out.pci_out_enabled)
 763                 return;
 764
 765         /*
 766          * Now we know that queue type is either qeth without pci enabled
 767          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 768          * EMPTY is noticed and outbound_handler is called after some time.
 769          */
 770         if (qdio_outbound_q_done(q))
 771                 del_timer(&q->u.out.timer);
 772         else
 773                 if (!timer_pending(&q->u.out.timer))
 774                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 775         return;
 776
 777 sched:
 778         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 779                 return;
 780         tasklet_schedule(&q->tasklet);
 781 }
 782
 783 /* outbound tasklet */
 784 void qdio_outbound_processing(unsigned long data)
 785 {
 786         struct qdio_q *q = (struct qdio_q *)data;
 787         __qdio_outbound_processing(q);
 788 }
 789
 790 void qdio_outbound_timer(unsigned long data)
 791 {
 792         struct qdio_q *q = (struct qdio_q *)data;
 793
 794         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 795                 return;
 796         tasklet_schedule(&q->tasklet);
 797 }
 798
 799 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 800 {
 801         struct qdio_q *out;
 802         int i;
 803
 804         if (!pci_out_supported(q))
 805                 return;
 806
 807         for_each_output_queue(q->irq_ptr, out, i)
 808                 if (!qdio_outbound_q_done(out))
 809                         tasklet_schedule(&out->tasklet);
 810 }
 811
 812 static void __tiqdio_inbound_processing(struct qdio_q *q)
 813 {
 814         qperf_inc(q, tasklet_inbound);
 815         qdio_sync_after_thinint(q);
 816
 817         /*
 818          * The interrupt could be caused by a PCI request. Check the
 819          * PCI capable outbound queues.
 820          */
 821         qdio_check_outbound_after_thinint(q);
 822
 823         if (!qdio_inbound_q_moved(q))
 824                 return;
 825
 826         qdio_kick_handler(q);
 827
 828         if (!qdio_inbound_q_done(q)) {
 829                 qperf_inc(q, tasklet_inbound_resched);
 830                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 831                         tasklet_schedule(&q->tasklet);
 832                         return;
 833                 }
 834         }
 835
 836         qdio_stop_polling(q);
 837         /*
 838          * We need to check again to not lose initiative after
 839          * resetting the ACK state.
 840          */
 841         if (!qdio_inbound_q_done(q)) {
 842                 qperf_inc(q, tasklet_inbound_resched2);
 843                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 844                         tasklet_schedule(&q->tasklet);
 845         }
 846 }
 847
 848 void tiqdio_inbound_processing(unsigned long data)
 849 {
 850         struct qdio_q *q = (struct qdio_q *)data;
 851         __tiqdio_inbound_processing(q);
 852 }
 853
 854 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 855                                   enum qdio_irq_states state)
 856 {
 857         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 858
 859         irq_ptr->state = state;
 860         mb();
 861 }
 862
 863 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 864 {
 865         if (irb->esw.esw0.erw.cons) {
 866                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 867                 DBF_ERROR_HEX(irb, 64);
 868                 DBF_ERROR_HEX(irb->ecw, 64);
 869         }
 870 }
 871
 872 /* PCI interrupt handler */
 873 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 874 {
 875         int i;
 876         struct qdio_q *q;
 877
 878         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 879                 return;
 880
 881         for_each_input_queue(irq_ptr, q, i)
 882                 tasklet_schedule(&q->tasklet);
 883
 884         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 885                 return;
 886
 887         for_each_output_queue(irq_ptr, q, i) {
 888                 if (qdio_outbound_q_done(q))
 889                         continue;
 890
 891                 if (!siga_syncs_out_pci(q))
 892                         qdio_siga_sync_q(q);
 893
 894                 tasklet_schedule(&q->tasklet);
 895         }
 896 }
 897
 898 static void qdio_handle_activate_check(struct ccw_device *cdev,
 899                                 unsigned long intparm, int cstat, int dstat)
 900 {
 901         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 902         struct qdio_q *q;
 903
 904         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 905         DBF_ERROR("intp :%lx", intparm);
 906         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 907
 908         if (irq_ptr->nr_input_qs) {
 909                 q = irq_ptr->input_qs[0];
 910         } else if (irq_ptr->nr_output_qs) {
 911                 q = irq_ptr->output_qs[0];
 912         } else {
 913                 dump_stack();
 914                 goto no_handler;
 915         }
 916         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 917                    0, -1, -1, irq_ptr->int_parm);
 918 no_handler:
 919         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 920 }
 921
 922 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 923                                       int dstat)
 924 {
 925         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 926
 927         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 928
 929         if (cstat)
 930                 goto error;
 931         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 932                 goto error;
 933         if (!(dstat & DEV_STAT_DEV_END))
 934                 goto error;
 935         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 936         return;
 937
 938 error:
 939         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 940         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 941         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 942 }
 943
 944 /* qdio interrupt handler */
 945 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 946                       struct irb *irb)
 947 {
 948         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 949         int cstat, dstat;
 950
 951         if (!intparm || !irq_ptr) {
 952                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 953                 return;
 954         }
 955
 956         if (IS_ERR(irb)) {
 957                 switch (PTR_ERR(irb)) {
 958                 case -EIO:
 959                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 960                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 961                         wake_up(&cdev->private->wait_q);
 962                         return;
 963                 default:
 964                         WARN_ON(1);
 965                         return;
 966                 }
 967         }
 968         qdio_irq_check_sense(irq_ptr, irb);
 969         cstat = irb->scsw.cmd.cstat;
 970         dstat = irb->scsw.cmd.dstat;
 971
 972         switch (irq_ptr->state) {
 973         case QDIO_IRQ_STATE_INACTIVE:
 974                 qdio_establish_handle_irq(cdev, cstat, dstat);
 975                 break;
 976         case QDIO_IRQ_STATE_CLEANUP:
 977                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 978                 break;
 979         case QDIO_IRQ_STATE_ESTABLISHED:
 980         case QDIO_IRQ_STATE_ACTIVE:
 981                 if (cstat & SCHN_STAT_PCI) {
 982                         qdio_int_handler_pci(irq_ptr);
 983                         return;
 984                 }
 985                 if (cstat || dstat)
 986                         qdio_handle_activate_check(cdev, intparm, cstat,
 987                                                    dstat);
 988                 break;
 989         case QDIO_IRQ_STATE_STOPPED:
 990                 break;
 991         default:
 992                 WARN_ON(1);
 993         }
 994         wake_up(&cdev->private->wait_q);
 995 }
 996
 997 /**
 998  * qdio_get_ssqd_desc - get qdio subchannel description
 999  * @cdev: ccw device to get description for
1000  * @data: where to store the ssqd
1001  *
1002  * Returns 0 or an error code. The results of the chsc are stored in the
1003  * specified structure.
1004  */
1005 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1006                        struct qdio_ssqd_desc *data)
1007 {
1008
1009         if (!cdev || !cdev->private)
1010                 return -EINVAL;
1011
1012         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1013         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1014 }
1015 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1016
1017 /**
1018  * qdio_cleanup - shutdown queues and free data structures
1019  * @cdev: associated ccw device
1020  * @how: use halt or clear to shutdown
1021  *
1022  * This function calls qdio_shutdown() for @cdev with method @how.
1023  * and qdio_free(). The qdio_free() return value is ignored since
1024  * !irq_ptr is already checked.
1025  */
1026 int qdio_cleanup(struct ccw_device *cdev, int how)
1027 {
1028         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1029         int rc;
1030
1031         if (!irq_ptr)
1032                 return -ENODEV;
1033
1034         rc = qdio_shutdown(cdev, how);
1035
1036         qdio_free(cdev);
1037         return rc;
1038 }
1039 EXPORT_SYMBOL_GPL(qdio_cleanup);
1040
1041 static void qdio_shutdown_queues(struct ccw_device *cdev)
1042 {
1043         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1044         struct qdio_q *q;
1045         int i;
1046
1047         for_each_input_queue(irq_ptr, q, i)
1048                 tasklet_kill(&q->tasklet);
1049
1050         for_each_output_queue(irq_ptr, q, i) {
1051                 del_timer(&q->u.out.timer);
1052                 tasklet_kill(&q->tasklet);
1053         }
1054 }
1055
1056 /**
1057  * qdio_shutdown - shut down a qdio subchannel
1058  * @cdev: associated ccw device
1059  * @how: use halt or clear to shutdown
1060  */
1061 int qdio_shutdown(struct ccw_device *cdev, int how)
1062 {
1063         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1064         int rc;
1065         unsigned long flags;
1066
1067         if (!irq_ptr)
1068                 return -ENODEV;
1069
1070         BUG_ON(irqs_disabled());
1071         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1072
1073         mutex_lock(&irq_ptr->setup_mutex);
1074         /*
1075          * Subchannel was already shot down. We cannot prevent being called
1076          * twice since cio may trigger a shutdown asynchronously.
1077          */
1078         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1079                 mutex_unlock(&irq_ptr->setup_mutex);
1080                 return 0;
1081         }
1082
1083         /*
1084          * Indicate that the device is going down. Scheduling the queue
1085          * tasklets is forbidden from here on.
1086          */
1087         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1088
1089         tiqdio_remove_input_queues(irq_ptr);
1090         qdio_shutdown_queues(cdev);
1091         qdio_shutdown_debug_entries(irq_ptr, cdev);
1092
1093         /* cleanup subchannel */
1094         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1095
1096         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1097                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1098         else
1099                 /* default behaviour is halt */
1100                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1101         if (rc) {
1102                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1103                 DBF_ERROR("rc:%4d", rc);
1104                 goto no_cleanup;
1105         }
1106
1107         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1108         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1109         wait_event_interruptible_timeout(cdev->private->wait_q,
1110                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1111                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1112                 10 * HZ);
1113         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1114
1115 no_cleanup:
1116         qdio_shutdown_thinint(irq_ptr);
1117
1118         /* restore interrupt handler */
1119         if ((void *)cdev->handler == (void *)qdio_int_handler)
1120                 cdev->handler = irq_ptr->orig_handler;
1121         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1122
1123         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1124         mutex_unlock(&irq_ptr->setup_mutex);
1125         if (rc)
1126                 return rc;
1127         return 0;
1128 }
1129 EXPORT_SYMBOL_GPL(qdio_shutdown);
1130
1131 /**
1132  * qdio_free - free data structures for a qdio subchannel
1133  * @cdev: associated ccw device
1134  */
1135 int qdio_free(struct ccw_device *cdev)
1136 {
1137         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1138
1139         if (!irq_ptr)
1140                 return -ENODEV;
1141
1142         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1143         mutex_lock(&irq_ptr->setup_mutex);
1144
1145         if (irq_ptr->debug_area != NULL) {
1146                 debug_unregister(irq_ptr->debug_area);
1147                 irq_ptr->debug_area = NULL;
1148         }
1149         cdev->private->qdio_data = NULL;
1150         mutex_unlock(&irq_ptr->setup_mutex);
1151
1152         qdio_release_memory(irq_ptr);
1153         return 0;
1154 }
1155 EXPORT_SYMBOL_GPL(qdio_free);
1156
1157 /**
1158  * qdio_initialize - allocate and establish queues for a qdio subchannel
1159  * @init_data: initialization data
1160  *
1161  * This function first allocates queues via qdio_allocate() and on success
1162  * establishes them via qdio_establish().
1163  */
1164 int qdio_initialize(struct qdio_initialize *init_data)
1165 {
1166         int rc;
1167
1168         rc = qdio_allocate(init_data);
1169         if (rc)
1170                 return rc;
1171
1172         rc = qdio_establish(init_data);
1173         if (rc)
1174                 qdio_free(init_data->cdev);
1175         return rc;
1176 }
1177 EXPORT_SYMBOL_GPL(qdio_initialize);
1178
1179 /**
1180  * qdio_allocate - allocate qdio queues and associated data
1181  * @init_data: initialization data
1182  */
1183 int qdio_allocate(struct qdio_initialize *init_data)
1184 {
1185         struct qdio_irq *irq_ptr;
1186
1187         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1188
1189         if ((init_data->no_input_qs && !init_data->input_handler) ||
1190             (init_data->no_output_qs && !init_data->output_handler))
1191                 return -EINVAL;
1192
1193         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1194             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1195                 return -EINVAL;
1196
1197         if ((!init_data->input_sbal_addr_array) ||
1198             (!init_data->output_sbal_addr_array))
1199                 return -EINVAL;
1200
1201         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1202         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1203         if (!irq_ptr)
1204                 goto out_err;
1205
1206         mutex_init(&irq_ptr->setup_mutex);
1207         qdio_allocate_dbf(init_data, irq_ptr);
1208
1209         /*
1210          * Allocate a page for the chsc calls in qdio_establish.
1211          * Must be pre-allocated since a zfcp recovery will call
1212          * qdio_establish. In case of low memory and swap on a zfcp disk
1213          * we may not be able to allocate memory otherwise.
1214          */
1215         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1216         if (!irq_ptr->chsc_page)
1217                 goto out_rel;
1218
1219         /* qdr is used in ccw1.cda which is u32 */
1220         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1221         if (!irq_ptr->qdr)
1222                 goto out_rel;
1223         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1224
1225         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1226                              init_data->no_output_qs))
1227                 goto out_rel;
1228
1229         init_data->cdev->private->qdio_data = irq_ptr;
1230         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1231         return 0;
1232 out_rel:
1233         qdio_release_memory(irq_ptr);
1234 out_err:
1235         return -ENOMEM;
1236 }
1237 EXPORT_SYMBOL_GPL(qdio_allocate);
1238
1239 /**
1240  * qdio_establish - establish queues on a qdio subchannel
1241  * @init_data: initialization data
1242  */
1243 int qdio_establish(struct qdio_initialize *init_data)
1244 {
1245         struct qdio_irq *irq_ptr;
1246         struct ccw_device *cdev = init_data->cdev;
1247         unsigned long saveflags;
1248         int rc;
1249
1250         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1251
1252         irq_ptr = cdev->private->qdio_data;
1253         if (!irq_ptr)
1254                 return -ENODEV;
1255
1256         if (cdev->private->state != DEV_STATE_ONLINE)
1257                 return -EINVAL;
1258
1259         mutex_lock(&irq_ptr->setup_mutex);
1260         qdio_setup_irq(init_data);
1261
1262         rc = qdio_establish_thinint(irq_ptr);
1263         if (rc) {
1264                 mutex_unlock(&irq_ptr->setup_mutex);
1265                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1266                 return rc;
1267         }
1268
1269         /* establish q */
1270         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1271         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1272         irq_ptr->ccw.count = irq_ptr->equeue.count;
1273         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1274
1275         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1276         ccw_device_set_options_mask(cdev, 0);
1277
1278         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1279         if (rc) {
1280                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1281                 DBF_ERROR("rc:%4x", rc);
1282         }
1283         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1284
1285         if (rc) {
1286                 mutex_unlock(&irq_ptr->setup_mutex);
1287                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1288                 return rc;
1289         }
1290
1291         wait_event_interruptible_timeout(cdev->private->wait_q,
1292                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1293                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1294
1295         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1296                 mutex_unlock(&irq_ptr->setup_mutex);
1297                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1298                 return -EIO;
1299         }
1300
1301         qdio_setup_ssqd_info(irq_ptr);
1302         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1303         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1304
1305         /* qebsm is now setup if available, initialize buffer states */
1306         qdio_init_buf_states(irq_ptr);
1307
1308         mutex_unlock(&irq_ptr->setup_mutex);
1309         qdio_print_subchannel_info(irq_ptr, cdev);
1310         qdio_setup_debug_entries(irq_ptr, cdev);
1311         return 0;
1312 }
1313 EXPORT_SYMBOL_GPL(qdio_establish);
1314
1315 /**
1316  * qdio_activate - activate queues on a qdio subchannel
1317  * @cdev: associated cdev
1318  */
1319 int qdio_activate(struct ccw_device *cdev)
1320 {
1321         struct qdio_irq *irq_ptr;
1322         int rc;
1323         unsigned long saveflags;
1324
1325         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1326
1327         irq_ptr = cdev->private->qdio_data;
1328         if (!irq_ptr)
1329                 return -ENODEV;
1330
1331         if (cdev->private->state != DEV_STATE_ONLINE)
1332                 return -EINVAL;
1333
1334         mutex_lock(&irq_ptr->setup_mutex);
1335         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1336                 rc = -EBUSY;
1337                 goto out;
1338         }
1339
1340         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1341         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1342         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1343         irq_ptr->ccw.cda = 0;
1344
1345         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1346         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1347
1348         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1349                               0, DOIO_DENY_PREFETCH);
1350         if (rc) {
1351                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1352                 DBF_ERROR("rc:%4x", rc);
1353         }
1354         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1355
1356         if (rc)
1357                 goto out;
1358
1359         if (is_thinint_irq(irq_ptr))
1360                 tiqdio_add_input_queues(irq_ptr);
1361
1362         /* wait for subchannel to become active */
1363         msleep(5);
1364
1365         switch (irq_ptr->state) {
1366         case QDIO_IRQ_STATE_STOPPED:
1367         case QDIO_IRQ_STATE_ERR:
1368                 rc = -EIO;
1369                 break;
1370         default:
1371                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1372                 rc = 0;
1373         }
1374 out:
1375         mutex_unlock(&irq_ptr->setup_mutex);
1376         return rc;
1377 }
1378 EXPORT_SYMBOL_GPL(qdio_activate);
1379
1380 static inline int buf_in_between(int bufnr, int start, int count)
1381 {
1382         int end = add_buf(start, count);
1383
1384         if (end > start) {
1385                 if (bufnr >= start && bufnr < end)
1386                         return 1;
1387                 else
1388                         return 0;
1389         }
1390
1391         /* wrap-around case */
1392         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1393             (bufnr < end))
1394                 return 1;
1395         else
1396                 return 0;
1397 }
1398
1399 /**
1400  * handle_inbound - reset processed input buffers
1401  * @q: queue containing the buffers
1402  * @callflags: flags
1403  * @bufnr: first buffer to process
1404  * @count: how many buffers are emptied
1405  */
1406 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1407                           int bufnr, int count)
1408 {
1409         int used, diff;
1410
1411         qperf_inc(q, inbound_call);
1412
1413         if (!q->u.in.polling)
1414                 goto set;
1415
1416         /* protect against stop polling setting an ACK for an emptied slsb */
1417         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1418                 /* overwriting everything, just delete polling status */
1419                 q->u.in.polling = 0;
1420                 q->u.in.ack_count = 0;
1421                 goto set;
1422         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1423                 if (is_qebsm(q)) {
1424                         /* partial overwrite, just update ack_start */
1425                         diff = add_buf(bufnr, count);
1426                         diff = sub_buf(diff, q->u.in.ack_start);
1427                         q->u.in.ack_count -= diff;
1428                         if (q->u.in.ack_count <= 0) {
1429                                 q->u.in.polling = 0;
1430                                 q->u.in.ack_count = 0;
1431                                 goto set;
1432                         }
1433                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1434                 }
1435                 else
1436                         /* the only ACK will be deleted, so stop polling */
1437                         q->u.in.polling = 0;
1438         }
1439
1440 set:
1441         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1442
1443         used = atomic_add_return(count, &q->nr_buf_used) - count;
1444         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1445
1446         /* no need to signal as long as the adapter had free buffers */
1447         if (used)
1448                 return 0;
1449
1450         if (need_siga_in(q))
1451                 return qdio_siga_input(q);
1452         return 0;
1453 }
1454
1455 /**
1456  * handle_outbound - process filled outbound buffers
1457  * @q: queue containing the buffers
1458  * @callflags: flags
1459  * @bufnr: first buffer to process
1460  * @count: how many buffers are filled
1461  */
1462 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1463                            int bufnr, int count)
1464 {
1465         unsigned char state;
1466         int used, rc = 0;
1467
1468         qperf_inc(q, outbound_call);
1469
1470         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1471         used = atomic_add_return(count, &q->nr_buf_used);
1472         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1473
1474         if (callflags & QDIO_FLAG_PCI_OUT) {
1475                 q->u.out.pci_out_enabled = 1;
1476                 qperf_inc(q, pci_request_int);
1477         }
1478         else
1479                 q->u.out.pci_out_enabled = 0;
1480
1481         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1482                 if (multicast_outbound(q))
1483                         rc = qdio_kick_outbound_q(q);
1484                 else
1485                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1486                             (count > 1) &&
1487                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1488                                 /* exploit enhanced SIGA */
1489                                 q->u.out.use_enh_siga = 1;
1490                                 rc = qdio_kick_outbound_q(q);
1491                         } else {
1492                                 /*
1493                                 * One siga-w per buffer required for unicast
1494                                 * HiperSockets.
1495                                 */
1496                                 q->u.out.use_enh_siga = 0;
1497                                 while (count--) {
1498                                         rc = qdio_kick_outbound_q(q);
1499                                         if (rc)
1500                                                 goto out;
1501                                 }
1502                         }
1503                 goto out;
1504         }
1505
1506         if (need_siga_sync(q)) {
1507                 qdio_siga_sync_q(q);
1508                 goto out;
1509         }
1510
1511         /* try to fast requeue buffers */
1512         get_buf_state(q, prev_buf(bufnr), &state, 0);
1513         if (state != SLSB_CU_OUTPUT_PRIMED)
1514                 rc = qdio_kick_outbound_q(q);
1515         else
1516                 qperf_inc(q, fast_requeue);
1517
1518 out:
1519         tasklet_schedule(&q->tasklet);
1520         return rc;
1521 }
1522
1523 /**
1524  * do_QDIO - process input or output buffers
1525  * @cdev: associated ccw_device for the qdio subchannel
1526  * @callflags: input or output and special flags from the program
1527  * @q_nr: queue number
1528  * @bufnr: buffer number
1529  * @count: how many buffers to process
1530  */
1531 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1532             int q_nr, unsigned int bufnr, unsigned int count)
1533 {
1534         struct qdio_irq *irq_ptr;
1535
1536         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1537                 return -EINVAL;
1538
1539         irq_ptr = cdev->private->qdio_data;
1540         if (!irq_ptr)
1541                 return -ENODEV;
1542
1543         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1544                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1545
1546         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1547                 return -EBUSY;
1548
1549         if (callflags & QDIO_FLAG_SYNC_INPUT)
1550                 return handle_inbound(irq_ptr->input_qs[q_nr],
1551                                       callflags, bufnr, count);
1552         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1553                 return handle_outbound(irq_ptr->output_qs[q_nr],
1554                                        callflags, bufnr, count);
1555         return -EINVAL;
1556 }
1557 EXPORT_SYMBOL_GPL(do_QDIO);
1558
1559 static int __init init_QDIO(void)
1560 {
1561         int rc;
1562
1563         rc = qdio_setup_init();
1564         if (rc)
1565                 return rc;
1566         rc = tiqdio_allocate_memory();
1567         if (rc)
1568                 goto out_cache;
1569         rc = qdio_debug_init();
1570         if (rc)
1571                 goto out_ti;
1572         rc = tiqdio_register_thinints();
1573         if (rc)
1574                 goto out_debug;
1575         return 0;
1576
1577 out_debug:
1578         qdio_debug_exit();
1579 out_ti:
1580         tiqdio_free_memory();
1581 out_cache:
1582         qdio_setup_exit();
1583         return rc;
1584 }
1585
1586 static void __exit exit_QDIO(void)
1587 {
1588         tiqdio_unregister_thinints();
1589         tiqdio_free_memory();
1590         qdio_debug_exit();
1591         qdio_setup_exit();
1592 }
1593
1594 module_init(init_QDIO);
1595 module_exit(exit_QDIO);