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