git.oblomov.eu Git - linux-2.6/blob - drivers/s390/cio/qdio_main.c

   1 /*
   2  * linux/drivers/s390/cio/qdio_main.c
   3  *
   4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   5  *
   6  * Copyright 2000,2008 IBM Corp.
   7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   8  *            Jan Glauber <jang@linux.vnet.ibm.com>
   9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include <asm/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19
  20 #include "cio.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "qdio.h"
  24 #include "qdio_debug.h"
  25 #include "qdio_perf.h"
  26
  27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  28         "Jan Glauber <jang@linux.vnet.ibm.com>");
  29 MODULE_DESCRIPTION("QDIO base support");
  30 MODULE_LICENSE("GPL");
  31
  32 static inline int do_siga_sync(struct subchannel_id schid,
  33                                unsigned int out_mask, unsigned int in_mask)
  34 {
  35         register unsigned long __fc asm ("0") = 2;
  36         register struct subchannel_id __schid asm ("1") = schid;
  37         register unsigned long out asm ("2") = out_mask;
  38         register unsigned long in asm ("3") = in_mask;
  39         int cc;
  40
  41         asm volatile(
  42                 "       siga    0\n"
  43                 "       ipm     %0\n"
  44                 "       srl     %0,28\n"
  45                 : "=d" (cc)
  46                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  47         return cc;
  48 }
  49
  50 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
  51 {
  52         register unsigned long __fc asm ("0") = 1;
  53         register struct subchannel_id __schid asm ("1") = schid;
  54         register unsigned long __mask asm ("2") = mask;
  55         int cc;
  56
  57         asm volatile(
  58                 "       siga    0\n"
  59                 "       ipm     %0\n"
  60                 "       srl     %0,28\n"
  61                 : "=d" (cc)
  62                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  63         return cc;
  64 }
  65
  66 /**
  67  * do_siga_output - perform SIGA-w/wt function
  68  * @schid: subchannel id or in case of QEBSM the subchannel token
  69  * @mask: which output queues to process
  70  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  71  * @fc: function code to perform
  72  *
  73  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
  74  * Note: For IQDC unicast queues only the highest priority queue is processed.
  75  */
  76 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  77                                  unsigned int *bb, unsigned int fc)
  78 {
  79         register unsigned long __fc asm("0") = fc;
  80         register unsigned long __schid asm("1") = schid;
  81         register unsigned long __mask asm("2") = mask;
  82         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  83
  84         asm volatile(
  85                 "       siga    0\n"
  86                 "0:     ipm     %0\n"
  87                 "       srl     %0,28\n"
  88                 "1:\n"
  89                 EX_TABLE(0b, 1b)
  90                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
  91                 : : "cc", "memory");
  92         *bb = ((unsigned int) __fc) >> 31;
  93         return cc;
  94 }
  95
  96 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
  97 {
  98         /* all done or next buffer state different */
  99         if (ccq == 0 || ccq == 32)
 100                 return 0;
 101         /* not all buffers processed */
 102         if (ccq == 96 || ccq == 97)
 103                 return 1;
 104         /* notify devices immediately */
 105         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 106         return -EIO;
 107 }
 108
 109 /**
 110  * qdio_do_eqbs - extract buffer states for QEBSM
 111  * @q: queue to manipulate
 112  * @state: state of the extracted buffers
 113  * @start: buffer number to start at
 114  * @count: count of buffers to examine
 115  * @auto_ack: automatically acknowledge buffers
 116  *
 117  * Returns the number of successfully extracted equal buffer states.
 118  * Stops processing if a state is different from the last buffers state.
 119  */
 120 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 121                         int start, int count, int auto_ack)
 122 {
 123         unsigned int ccq = 0;
 124         int tmp_count = count, tmp_start = start;
 125         int nr = q->nr;
 126         int rc;
 127
 128         BUG_ON(!q->irq_ptr->sch_token);
 129         qdio_perf_stat_inc(&perf_stats.debug_eqbs_all);
 130
 131         if (!q->is_input_q)
 132                 nr += q->irq_ptr->nr_input_qs;
 133 again:
 134         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 135                       auto_ack);
 136         rc = qdio_check_ccq(q, ccq);
 137
 138         /* At least one buffer was processed, return and extract the remaining
 139          * buffers later.
 140          */
 141         if ((ccq == 96) && (count != tmp_count)) {
 142                 qdio_perf_stat_inc(&perf_stats.debug_eqbs_incomplete);
 143                 return (count - tmp_count);
 144         }
 145
 146         if (rc == 1) {
 147                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 148                 goto again;
 149         }
 150
 151         if (rc < 0) {
 152                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 153                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 154                 q->handler(q->irq_ptr->cdev,
 155                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 156                            0, -1, -1, q->irq_ptr->int_parm);
 157                 return 0;
 158         }
 159         return count - tmp_count;
 160 }
 161
 162 /**
 163  * qdio_do_sqbs - set buffer states for QEBSM
 164  * @q: queue to manipulate
 165  * @state: new state of the buffers
 166  * @start: first buffer number to change
 167  * @count: how many buffers to change
 168  *
 169  * Returns the number of successfully changed buffers.
 170  * Does retrying until the specified count of buffer states is set or an
 171  * error occurs.
 172  */
 173 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 174                         int count)
 175 {
 176         unsigned int ccq = 0;
 177         int tmp_count = count, tmp_start = start;
 178         int nr = q->nr;
 179         int rc;
 180
 181         if (!count)
 182                 return 0;
 183
 184         BUG_ON(!q->irq_ptr->sch_token);
 185         qdio_perf_stat_inc(&perf_stats.debug_sqbs_all);
 186
 187         if (!q->is_input_q)
 188                 nr += q->irq_ptr->nr_input_qs;
 189 again:
 190         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 191         rc = qdio_check_ccq(q, ccq);
 192         if (rc == 1) {
 193                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 194                 qdio_perf_stat_inc(&perf_stats.debug_sqbs_incomplete);
 195                 goto again;
 196         }
 197         if (rc < 0) {
 198                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 199                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 200                 q->handler(q->irq_ptr->cdev,
 201                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 202                            0, -1, -1, q->irq_ptr->int_parm);
 203                 return 0;
 204         }
 205         WARN_ON(tmp_count);
 206         return count - tmp_count;
 207 }
 208
 209 /* returns number of examined buffers and their common state in *state */
 210 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 211                                  unsigned char *state, unsigned int count,
 212                                  int auto_ack)
 213 {
 214         unsigned char __state = 0;
 215         int i;
 216
 217         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 218         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 219
 220         if (is_qebsm(q))
 221                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 222
 223         for (i = 0; i < count; i++) {
 224                 if (!__state)
 225                         __state = q->slsb.val[bufnr];
 226                 else if (q->slsb.val[bufnr] != __state)
 227                         break;
 228                 bufnr = next_buf(bufnr);
 229         }
 230         *state = __state;
 231         return i;
 232 }
 233
 234 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 235                                 unsigned char *state, int auto_ack)
 236 {
 237         return get_buf_states(q, bufnr, state, 1, auto_ack);
 238 }
 239
 240 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 241 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 242                                  unsigned char state, int count)
 243 {
 244         int i;
 245
 246         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 247         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 248
 249         if (is_qebsm(q))
 250                 return qdio_do_sqbs(q, state, bufnr, count);
 251
 252         for (i = 0; i < count; i++) {
 253                 xchg(&q->slsb.val[bufnr], state);
 254                 bufnr = next_buf(bufnr);
 255         }
 256         return count;
 257 }
 258
 259 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 260                                 unsigned char state)
 261 {
 262         return set_buf_states(q, bufnr, state, 1);
 263 }
 264
 265 /* set slsb states to initial state */
 266 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 267 {
 268         struct qdio_q *q;
 269         int i;
 270
 271         for_each_input_queue(irq_ptr, q, i)
 272                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 273                                QDIO_MAX_BUFFERS_PER_Q);
 274         for_each_output_queue(irq_ptr, q, i)
 275                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 276                                QDIO_MAX_BUFFERS_PER_Q);
 277 }
 278
 279 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 280                           unsigned int input)
 281 {
 282         int cc;
 283
 284         if (!need_siga_sync(q))
 285                 return 0;
 286
 287         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 288         qdio_perf_stat_inc(&perf_stats.siga_sync);
 289
 290         cc = do_siga_sync(q->irq_ptr->schid, output, input);
 291         if (cc)
 292                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 293         return cc;
 294 }
 295
 296 static inline int qdio_siga_sync_q(struct qdio_q *q)
 297 {
 298         if (q->is_input_q)
 299                 return qdio_siga_sync(q, 0, q->mask);
 300         else
 301                 return qdio_siga_sync(q, q->mask, 0);
 302 }
 303
 304 static inline int qdio_siga_sync_out(struct qdio_q *q)
 305 {
 306         return qdio_siga_sync(q, ~0U, 0);
 307 }
 308
 309 static inline int qdio_siga_sync_all(struct qdio_q *q)
 310 {
 311         return qdio_siga_sync(q, ~0U, ~0U);
 312 }
 313
 314 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 315 {
 316         unsigned long schid;
 317         unsigned int fc = 0;
 318         u64 start_time = 0;
 319         int cc;
 320
 321         if (q->u.out.use_enh_siga)
 322                 fc = 3;
 323
 324         if (is_qebsm(q)) {
 325                 schid = q->irq_ptr->sch_token;
 326                 fc |= 0x80;
 327         }
 328         else
 329                 schid = *((u32 *)&q->irq_ptr->schid);
 330
 331 again:
 332         cc = do_siga_output(schid, q->mask, busy_bit, fc);
 333
 334         /* hipersocket busy condition */
 335         if (*busy_bit) {
 336                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 337
 338                 if (!start_time) {
 339                         start_time = get_usecs();
 340                         goto again;
 341                 }
 342                 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 343                         goto again;
 344         }
 345         return cc;
 346 }
 347
 348 static inline int qdio_siga_input(struct qdio_q *q)
 349 {
 350         int cc;
 351
 352         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 353         qdio_perf_stat_inc(&perf_stats.siga_in);
 354
 355         cc = do_siga_input(q->irq_ptr->schid, q->mask);
 356         if (cc)
 357                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 358         return cc;
 359 }
 360
 361 static inline void qdio_sync_after_thinint(struct qdio_q *q)
 362 {
 363         if (pci_out_supported(q)) {
 364                 if (need_siga_sync_thinint(q))
 365                         qdio_siga_sync_all(q);
 366                 else if (need_siga_sync_out_thinint(q))
 367                         qdio_siga_sync_out(q);
 368         } else
 369                 qdio_siga_sync_q(q);
 370 }
 371
 372 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 373                         unsigned char *state)
 374 {
 375         qdio_siga_sync_q(q);
 376         return get_buf_states(q, bufnr, state, 1, 0);
 377 }
 378
 379 static inline void qdio_stop_polling(struct qdio_q *q)
 380 {
 381         if (!q->u.in.polling)
 382                 return;
 383
 384         q->u.in.polling = 0;
 385         qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
 386
 387         /* show the card that we are not polling anymore */
 388         if (is_qebsm(q)) {
 389                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 390                                q->u.in.ack_count);
 391                 q->u.in.ack_count = 0;
 392         } else
 393                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 394 }
 395
 396 static void announce_buffer_error(struct qdio_q *q, int count)
 397 {
 398         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 399
 400         /* special handling for no target buffer empty */
 401         if ((!q->is_input_q &&
 402             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 403                 qdio_perf_stat_inc(&perf_stats.outbound_target_full);
 404                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d",
 405                               q->first_to_check);
 406                 return;
 407         }
 408
 409         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 410         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 411         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 412         DBF_ERROR("F14:%2x F15:%2x",
 413                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 414                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 415 }
 416
 417 static inline void inbound_primed(struct qdio_q *q, int count)
 418 {
 419         int new;
 420
 421         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count);
 422
 423         /* for QEBSM the ACK was already set by EQBS */
 424         if (is_qebsm(q)) {
 425                 if (!q->u.in.polling) {
 426                         q->u.in.polling = 1;
 427                         q->u.in.ack_count = count;
 428                         q->u.in.ack_start = q->first_to_check;
 429                         return;
 430                 }
 431
 432                 /* delete the previous ACK's */
 433                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 434                                q->u.in.ack_count);
 435                 q->u.in.ack_count = count;
 436                 q->u.in.ack_start = q->first_to_check;
 437                 return;
 438         }
 439
 440         /*
 441          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 442          * or by the next inbound run.
 443          */
 444         new = add_buf(q->first_to_check, count - 1);
 445         if (q->u.in.polling) {
 446                 /* reset the previous ACK but first set the new one */
 447                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 448                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 449         } else {
 450                 q->u.in.polling = 1;
 451                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 452         }
 453
 454         q->u.in.ack_start = new;
 455         count--;
 456         if (!count)
 457                 return;
 458
 459         /*
 460          * Need to change all PRIMED buffers to NOT_INIT, otherwise
 461          * we're loosing initiative in the thinint code.
 462          */
 463         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT,
 464                        count);
 465 }
 466
 467 static int get_inbound_buffer_frontier(struct qdio_q *q)
 468 {
 469         int count, stop;
 470         unsigned char state;
 471
 472         /*
 473          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 474          * would return 0.
 475          */
 476         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 477         stop = add_buf(q->first_to_check, count);
 478
 479         /*
 480          * No siga sync here, as a PCI or we after a thin interrupt
 481          * will sync the queues.
 482          */
 483
 484         /* need to set count to 1 for non-qebsm */
 485         if (!is_qebsm(q))
 486                 count = 1;
 487
 488 check_next:
 489         if (q->first_to_check == stop)
 490                 goto out;
 491
 492         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 493         if (!count)
 494                 goto out;
 495
 496         switch (state) {
 497         case SLSB_P_INPUT_PRIMED:
 498                 inbound_primed(q, count);
 499                 /*
 500                  * No siga-sync needed for non-qebsm here, as the inbound queue
 501                  * will be synced on the next siga-r, resp.
 502                  * qdio_inbound_q_done will do the siga-sync.
 503                  */
 504                 q->first_to_check = add_buf(q->first_to_check, count);
 505                 atomic_sub(count, &q->nr_buf_used);
 506                 goto check_next;
 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                 break;
 513         case SLSB_CU_INPUT_EMPTY:
 514         case SLSB_P_INPUT_NOT_INIT:
 515         case SLSB_P_INPUT_ACK:
 516                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 517                 break;
 518         default:
 519                 BUG();
 520         }
 521 out:
 522         return q->first_to_check;
 523 }
 524
 525 static int qdio_inbound_q_moved(struct qdio_q *q)
 526 {
 527         int bufnr;
 528
 529         bufnr = get_inbound_buffer_frontier(q);
 530
 531         if ((bufnr != q->last_move) || q->qdio_error) {
 532                 q->last_move = bufnr;
 533                 if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
 534                         q->u.in.timestamp = get_usecs();
 535                 return 1;
 536         } else
 537                 return 0;
 538 }
 539
 540 static inline int qdio_inbound_q_done(struct qdio_q *q)
 541 {
 542         unsigned char state = 0;
 543
 544         if (!atomic_read(&q->nr_buf_used))
 545                 return 1;
 546
 547         qdio_siga_sync_q(q);
 548         get_buf_state(q, q->first_to_check, &state, 0);
 549
 550         if (state == SLSB_P_INPUT_PRIMED)
 551                 /* more work coming */
 552                 return 0;
 553
 554         if (is_thinint_irq(q->irq_ptr))
 555                 return 1;
 556
 557         /* don't poll under z/VM */
 558         if (MACHINE_IS_VM)
 559                 return 1;
 560
 561         /*
 562          * At this point we know, that inbound first_to_check
 563          * has (probably) not moved (see qdio_inbound_processing).
 564          */
 565         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 566                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d",
 567                               q->first_to_check);
 568                 return 1;
 569         } else
 570                 return 0;
 571 }
 572
 573 static void qdio_kick_handler(struct qdio_q *q)
 574 {
 575         int start = q->first_to_kick;
 576         int end = q->first_to_check;
 577         int count;
 578
 579         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 580                 return;
 581
 582         count = sub_buf(end, start);
 583
 584         if (q->is_input_q) {
 585                 qdio_perf_stat_inc(&perf_stats.inbound_handler);
 586                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count);
 587         } else {
 588                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: nr:%1d", q->nr);
 589                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count);
 590         }
 591
 592         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 593                    q->irq_ptr->int_parm);
 594
 595         /* for the next time */
 596         q->first_to_kick = end;
 597         q->qdio_error = 0;
 598 }
 599
 600 static void __qdio_inbound_processing(struct qdio_q *q)
 601 {
 602         qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
 603 again:
 604         if (!qdio_inbound_q_moved(q))
 605                 return;
 606
 607         qdio_kick_handler(q);
 608
 609         if (!qdio_inbound_q_done(q))
 610                 /* means poll time is not yet over */
 611                 goto again;
 612
 613         qdio_stop_polling(q);
 614         /*
 615          * We need to check again to not lose initiative after
 616          * resetting the ACK state.
 617          */
 618         if (!qdio_inbound_q_done(q))
 619                 goto again;
 620 }
 621
 622 void qdio_inbound_processing(unsigned long data)
 623 {
 624         struct qdio_q *q = (struct qdio_q *)data;
 625         __qdio_inbound_processing(q);
 626 }
 627
 628 static int get_outbound_buffer_frontier(struct qdio_q *q)
 629 {
 630         int count, stop;
 631         unsigned char state;
 632
 633         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 634             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 635                 qdio_siga_sync_q(q);
 636
 637         /*
 638          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 639          * would return 0.
 640          */
 641         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 642         stop = add_buf(q->first_to_check, count);
 643
 644         /* need to set count to 1 for non-qebsm */
 645         if (!is_qebsm(q))
 646                 count = 1;
 647
 648 check_next:
 649         if (q->first_to_check == stop)
 650                 return q->first_to_check;
 651
 652         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 653         if (!count)
 654                 return q->first_to_check;
 655
 656         switch (state) {
 657         case SLSB_P_OUTPUT_EMPTY:
 658                 /* the adapter got it */
 659                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count);
 660
 661                 atomic_sub(count, &q->nr_buf_used);
 662                 q->first_to_check = add_buf(q->first_to_check, count);
 663                 /*
 664                  * We fetch all buffer states at once. get_buf_states may
 665                  * return count < stop. For QEBSM we do not loop.
 666                  */
 667                 if (is_qebsm(q))
 668                         break;
 669                 goto check_next;
 670         case SLSB_P_OUTPUT_ERROR:
 671                 announce_buffer_error(q, count);
 672                 /* process the buffer, the upper layer will take care of it */
 673                 q->first_to_check = add_buf(q->first_to_check, count);
 674                 atomic_sub(count, &q->nr_buf_used);
 675                 break;
 676         case SLSB_CU_OUTPUT_PRIMED:
 677                 /* the adapter has not fetched the output yet */
 678                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 679                 break;
 680         case SLSB_P_OUTPUT_NOT_INIT:
 681         case SLSB_P_OUTPUT_HALTED:
 682                 break;
 683         default:
 684                 BUG();
 685         }
 686         return q->first_to_check;
 687 }
 688
 689 /* all buffers processed? */
 690 static inline int qdio_outbound_q_done(struct qdio_q *q)
 691 {
 692         return atomic_read(&q->nr_buf_used) == 0;
 693 }
 694
 695 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 696 {
 697         int bufnr;
 698
 699         bufnr = get_outbound_buffer_frontier(q);
 700
 701         if ((bufnr != q->last_move) || q->qdio_error) {
 702                 q->last_move = bufnr;
 703                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 704                 return 1;
 705         } else
 706                 return 0;
 707 }
 708
 709 static int qdio_kick_outbound_q(struct qdio_q *q)
 710 {
 711         unsigned int busy_bit;
 712         int cc;
 713
 714         if (!need_siga_out(q))
 715                 return 0;
 716
 717         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 718         qdio_perf_stat_inc(&perf_stats.siga_out);
 719
 720         cc = qdio_siga_output(q, &busy_bit);
 721         switch (cc) {
 722         case 0:
 723                 break;
 724         case 2:
 725                 if (busy_bit) {
 726                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 727                         cc |= QDIO_ERROR_SIGA_BUSY;
 728                 } else
 729                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 730                 break;
 731         case 1:
 732         case 3:
 733                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 734                 break;
 735         }
 736         return cc;
 737 }
 738
 739 static void __qdio_outbound_processing(struct qdio_q *q)
 740 {
 741         qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
 742         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 743
 744         if (qdio_outbound_q_moved(q))
 745                 qdio_kick_handler(q);
 746
 747         if (queue_type(q) == QDIO_ZFCP_QFMT)
 748                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 749                         goto sched;
 750
 751         /* bail out for HiperSockets unicast queues */
 752         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 753                 return;
 754
 755         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 756             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 757                 goto sched;
 758
 759         if (q->u.out.pci_out_enabled)
 760                 return;
 761
 762         /*
 763          * Now we know that queue type is either qeth without pci enabled
 764          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 765          * EMPTY is noticed and outbound_handler is called after some time.
 766          */
 767         if (qdio_outbound_q_done(q))
 768                 del_timer(&q->u.out.timer);
 769         else {
 770                 if (!timer_pending(&q->u.out.timer)) {
 771                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 772                         qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
 773                 }
 774         }
 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         qdio_perf_stat_inc(&perf_stats.thinint_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                 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop);
 830                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 831                         tasklet_schedule(&q->tasklet);
 832         }
 833
 834         qdio_stop_polling(q);
 835         /*
 836          * We need to check again to not lose initiative after
 837          * resetting the ACK state.
 838          */
 839         if (!qdio_inbound_q_done(q)) {
 840                 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2);
 841                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 842                         tasklet_schedule(&q->tasklet);
 843         }
 844 }
 845
 846 void tiqdio_inbound_processing(unsigned long data)
 847 {
 848         struct qdio_q *q = (struct qdio_q *)data;
 849         __tiqdio_inbound_processing(q);
 850 }
 851
 852 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 853                                   enum qdio_irq_states state)
 854 {
 855         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 856
 857         irq_ptr->state = state;
 858         mb();
 859 }
 860
 861 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 862 {
 863         if (irb->esw.esw0.erw.cons) {
 864                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 865                 DBF_ERROR_HEX(irb, 64);
 866                 DBF_ERROR_HEX(irb->ecw, 64);
 867         }
 868 }
 869
 870 /* PCI interrupt handler */
 871 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 872 {
 873         int i;
 874         struct qdio_q *q;
 875
 876         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 877                 return;
 878
 879         qdio_perf_stat_inc(&perf_stats.pci_int);
 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         qdio_perf_stat_inc(&perf_stats.qdio_int);
 952
 953         if (!intparm || !irq_ptr) {
 954                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 955                 return;
 956         }
 957
 958         if (IS_ERR(irb)) {
 959                 switch (PTR_ERR(irb)) {
 960                 case -EIO:
 961                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 962                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 963                         wake_up(&cdev->private->wait_q);
 964                         return;
 965                 default:
 966                         WARN_ON(1);
 967                         return;
 968                 }
 969         }
 970         qdio_irq_check_sense(irq_ptr, irb);
 971         cstat = irb->scsw.cmd.cstat;
 972         dstat = irb->scsw.cmd.dstat;
 973
 974         switch (irq_ptr->state) {
 975         case QDIO_IRQ_STATE_INACTIVE:
 976                 qdio_establish_handle_irq(cdev, cstat, dstat);
 977                 break;
 978         case QDIO_IRQ_STATE_CLEANUP:
 979                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 980                 break;
 981         case QDIO_IRQ_STATE_ESTABLISHED:
 982         case QDIO_IRQ_STATE_ACTIVE:
 983                 if (cstat & SCHN_STAT_PCI) {
 984                         qdio_int_handler_pci(irq_ptr);
 985                         return;
 986                 }
 987                 if (cstat || dstat)
 988                         qdio_handle_activate_check(cdev, intparm, cstat,
 989                                                    dstat);
 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         if (!q->u.in.polling)
1412                 goto set;
1413
1414         /* protect against stop polling setting an ACK for an emptied slsb */
1415         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1416                 /* overwriting everything, just delete polling status */
1417                 q->u.in.polling = 0;
1418                 q->u.in.ack_count = 0;
1419                 goto set;
1420         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1421                 if (is_qebsm(q)) {
1422                         /* partial overwrite, just update ack_start */
1423                         diff = add_buf(bufnr, count);
1424                         diff = sub_buf(diff, q->u.in.ack_start);
1425                         q->u.in.ack_count -= diff;
1426                         if (q->u.in.ack_count <= 0) {
1427                                 q->u.in.polling = 0;
1428                                 q->u.in.ack_count = 0;
1429                                 goto set;
1430                         }
1431                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1432                 }
1433                 else
1434                         /* the only ACK will be deleted, so stop polling */
1435                         q->u.in.polling = 0;
1436         }
1437
1438 set:
1439         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1440
1441         used = atomic_add_return(count, &q->nr_buf_used) - count;
1442         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1443
1444         /* no need to signal as long as the adapter had free buffers */
1445         if (used)
1446                 return 0;
1447
1448         if (need_siga_in(q))
1449                 return qdio_siga_input(q);
1450         return 0;
1451 }
1452
1453 /**
1454  * handle_outbound - process filled outbound buffers
1455  * @q: queue containing the buffers
1456  * @callflags: flags
1457  * @bufnr: first buffer to process
1458  * @count: how many buffers are filled
1459  */
1460 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1461                            int bufnr, int count)
1462 {
1463         unsigned char state;
1464         int used, rc = 0;
1465
1466         qdio_perf_stat_inc(&perf_stats.outbound_handler);
1467
1468         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1469         used = atomic_add_return(count, &q->nr_buf_used);
1470         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1471
1472         if (callflags & QDIO_FLAG_PCI_OUT)
1473                 q->u.out.pci_out_enabled = 1;
1474         else
1475                 q->u.out.pci_out_enabled = 0;
1476
1477         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1478                 if (multicast_outbound(q))
1479                         rc = qdio_kick_outbound_q(q);
1480                 else
1481                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1482                             (count > 1) &&
1483                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1484                                 /* exploit enhanced SIGA */
1485                                 q->u.out.use_enh_siga = 1;
1486                                 rc = qdio_kick_outbound_q(q);
1487                         } else {
1488                                 /*
1489                                 * One siga-w per buffer required for unicast
1490                                 * HiperSockets.
1491                                 */
1492                                 q->u.out.use_enh_siga = 0;
1493                                 while (count--) {
1494                                         rc = qdio_kick_outbound_q(q);
1495                                         if (rc)
1496                                                 goto out;
1497                                 }
1498                         }
1499                 goto out;
1500         }
1501
1502         if (need_siga_sync(q)) {
1503                 qdio_siga_sync_q(q);
1504                 goto out;
1505         }
1506
1507         /* try to fast requeue buffers */
1508         get_buf_state(q, prev_buf(bufnr), &state, 0);
1509         if (state != SLSB_CU_OUTPUT_PRIMED)
1510                 rc = qdio_kick_outbound_q(q);
1511         else {
1512                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1513                 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1514         }
1515 out:
1516         tasklet_schedule(&q->tasklet);
1517         return rc;
1518 }
1519
1520 /**
1521  * do_QDIO - process input or output buffers
1522  * @cdev: associated ccw_device for the qdio subchannel
1523  * @callflags: input or output and special flags from the program
1524  * @q_nr: queue number
1525  * @bufnr: buffer number
1526  * @count: how many buffers to process
1527  */
1528 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1529             int q_nr, int bufnr, int count)
1530 {
1531         struct qdio_irq *irq_ptr;
1532
1533         if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1534             (count > QDIO_MAX_BUFFERS_PER_Q) ||
1535             (q_nr >= QDIO_MAX_QUEUES_PER_IRQ))
1536                 return -EINVAL;
1537
1538         if (!count)
1539                 return 0;
1540
1541         irq_ptr = cdev->private->qdio_data;
1542         if (!irq_ptr)
1543                 return -ENODEV;
1544
1545         if (callflags & QDIO_FLAG_SYNC_INPUT)
1546                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1547         else
1548                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1549         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1550         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1551
1552         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1553                 return -EBUSY;
1554
1555         if (callflags & QDIO_FLAG_SYNC_INPUT)
1556                 return handle_inbound(irq_ptr->input_qs[q_nr],
1557                                       callflags, bufnr, count);
1558         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1559                 return handle_outbound(irq_ptr->output_qs[q_nr],
1560                                        callflags, bufnr, count);
1561         return -EINVAL;
1562 }
1563 EXPORT_SYMBOL_GPL(do_QDIO);
1564
1565 static int __init init_QDIO(void)
1566 {
1567         int rc;
1568
1569         rc = qdio_setup_init();
1570         if (rc)
1571                 return rc;
1572         rc = tiqdio_allocate_memory();
1573         if (rc)
1574                 goto out_cache;
1575         rc = qdio_debug_init();
1576         if (rc)
1577                 goto out_ti;
1578         rc = qdio_setup_perf_stats();
1579         if (rc)
1580                 goto out_debug;
1581         rc = tiqdio_register_thinints();
1582         if (rc)
1583                 goto out_perf;
1584         return 0;
1585
1586 out_perf:
1587         qdio_remove_perf_stats();
1588 out_debug:
1589         qdio_debug_exit();
1590 out_ti:
1591         tiqdio_free_memory();
1592 out_cache:
1593         qdio_setup_exit();
1594         return rc;
1595 }
1596
1597 static void __exit exit_QDIO(void)
1598 {
1599         tiqdio_unregister_thinints();
1600         tiqdio_free_memory();
1601         qdio_remove_perf_stats();
1602         qdio_debug_exit();
1603         qdio_setup_exit();
1604 }
1605
1606 module_init(init_QDIO);
1607 module_exit(exit_QDIO);