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(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         qperf_inc(q, eqbs);
 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                 qperf_inc(q, eqbs_partial);
 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         qperf_inc(q, sqbs);
 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                 qperf_inc(q, sqbs_partial);
 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         qperf_inc(q, 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_clock();
 340                         goto again;
 341                 }
 342                 if ((get_clock() - 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         qperf_inc(q, siga_read);
 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         qperf_inc(q, 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 inline void account_sbals(struct qdio_q *q, int count)
 397 {
 398         int pos = 0;
 399
 400         q->q_stats.nr_sbal_total += count;
 401         if (count == QDIO_MAX_BUFFERS_MASK) {
 402                 q->q_stats.nr_sbals[7]++;
 403                 return;
 404         }
 405         while (count >>= 1)
 406                 pos++;
 407         q->q_stats.nr_sbals[pos]++;
 408 }
 409
 410 static void announce_buffer_error(struct qdio_q *q, int count)
 411 {
 412         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 413
 414         /* special handling for no target buffer empty */
 415         if ((!q->is_input_q &&
 416             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 417                 qperf_inc(q, target_full);
 418                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 419                               q->first_to_check);
 420                 return;
 421         }
 422
 423         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 424         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 425         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 426         DBF_ERROR("F14:%2x F15:%2x",
 427                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 428                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 429 }
 430
 431 static inline void inbound_primed(struct qdio_q *q, int count)
 432 {
 433         int new;
 434
 435         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 436
 437         /* for QEBSM the ACK was already set by EQBS */
 438         if (is_qebsm(q)) {
 439                 if (!q->u.in.polling) {
 440                         q->u.in.polling = 1;
 441                         q->u.in.ack_count = count;
 442                         q->u.in.ack_start = q->first_to_check;
 443                         return;
 444                 }
 445
 446                 /* delete the previous ACK's */
 447                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 448                                q->u.in.ack_count);
 449                 q->u.in.ack_count = count;
 450                 q->u.in.ack_start = q->first_to_check;
 451                 return;
 452         }
 453
 454         /*
 455          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 456          * or by the next inbound run.
 457          */
 458         new = add_buf(q->first_to_check, count - 1);
 459         if (q->u.in.polling) {
 460                 /* reset the previous ACK but first set the new one */
 461                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 462                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 463         } else {
 464                 q->u.in.polling = 1;
 465                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 466         }
 467
 468         q->u.in.ack_start = new;
 469         count--;
 470         if (!count)
 471                 return;
 472         /* need to change ALL buffers to get more interrupts */
 473         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 474 }
 475
 476 static int get_inbound_buffer_frontier(struct qdio_q *q)
 477 {
 478         int count, stop;
 479         unsigned char state;
 480
 481         /*
 482          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 483          * would return 0.
 484          */
 485         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 486         stop = add_buf(q->first_to_check, count);
 487
 488         if (q->first_to_check == stop)
 489                 goto out;
 490
 491         /*
 492          * No siga sync here, as a PCI or we after a thin interrupt
 493          * already sync'ed the queues.
 494          */
 495         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 496         if (!count)
 497                 goto out;
 498
 499         switch (state) {
 500         case SLSB_P_INPUT_PRIMED:
 501                 inbound_primed(q, count);
 502                 q->first_to_check = add_buf(q->first_to_check, count);
 503                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 504                         qperf_inc(q, inbound_queue_full);
 505                 if (q->irq_ptr->perf_stat_enabled)
 506                         account_sbals(q, count);
 507                 break;
 508         case SLSB_P_INPUT_ERROR:
 509                 announce_buffer_error(q, count);
 510                 /* process the buffer, the upper layer will take care of it */
 511                 q->first_to_check = add_buf(q->first_to_check, count);
 512                 atomic_sub(count, &q->nr_buf_used);
 513                 if (q->irq_ptr->perf_stat_enabled)
 514                         account_sbals_error(q, count);
 515                 break;
 516         case SLSB_CU_INPUT_EMPTY:
 517         case SLSB_P_INPUT_NOT_INIT:
 518         case SLSB_P_INPUT_ACK:
 519                 if (q->irq_ptr->perf_stat_enabled)
 520                         q->q_stats.nr_sbal_nop++;
 521                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 522                 break;
 523         default:
 524                 BUG();
 525         }
 526 out:
 527         return q->first_to_check;
 528 }
 529
 530 static int qdio_inbound_q_moved(struct qdio_q *q)
 531 {
 532         int bufnr;
 533
 534         bufnr = get_inbound_buffer_frontier(q);
 535
 536         if ((bufnr != q->last_move) || q->qdio_error) {
 537                 q->last_move = bufnr;
 538                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 539                         q->u.in.timestamp = get_clock();
 540                 return 1;
 541         } else
 542                 return 0;
 543 }
 544
 545 static inline int qdio_inbound_q_done(struct qdio_q *q)
 546 {
 547         unsigned char state = 0;
 548
 549         if (!atomic_read(&q->nr_buf_used))
 550                 return 1;
 551
 552         qdio_siga_sync_q(q);
 553         get_buf_state(q, q->first_to_check, &state, 0);
 554
 555         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 556                 /* more work coming */
 557                 return 0;
 558
 559         if (is_thinint_irq(q->irq_ptr))
 560                 return 1;
 561
 562         /* don't poll under z/VM */
 563         if (MACHINE_IS_VM)
 564                 return 1;
 565
 566         /*
 567          * At this point we know, that inbound first_to_check
 568          * has (probably) not moved (see qdio_inbound_processing).
 569          */
 570         if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 571                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 572                               q->first_to_check);
 573                 return 1;
 574         } else
 575                 return 0;
 576 }
 577
 578 static void qdio_kick_handler(struct qdio_q *q)
 579 {
 580         int start = q->first_to_kick;
 581         int end = q->first_to_check;
 582         int count;
 583
 584         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 585                 return;
 586
 587         count = sub_buf(end, start);
 588
 589         if (q->is_input_q) {
 590                 qperf_inc(q, inbound_handler);
 591                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 592         } else {
 593                 qperf_inc(q, outbound_handler);
 594                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 595                               start, count);
 596         }
 597
 598         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 599                    q->irq_ptr->int_parm);
 600
 601         /* for the next time */
 602         q->first_to_kick = end;
 603         q->qdio_error = 0;
 604 }
 605
 606 static void __qdio_inbound_processing(struct qdio_q *q)
 607 {
 608         qperf_inc(q, tasklet_inbound);
 609
 610         if (!qdio_inbound_q_moved(q))
 611                 return;
 612
 613         qdio_kick_handler(q);
 614
 615         if (!qdio_inbound_q_done(q)) {
 616                 /* means poll time is not yet over */
 617                 qperf_inc(q, tasklet_inbound_resched);
 618                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 619                         tasklet_schedule(&q->tasklet);
 620                         return;
 621                 }
 622         }
 623
 624         qdio_stop_polling(q);
 625         /*
 626          * We need to check again to not lose initiative after
 627          * resetting the ACK state.
 628          */
 629         if (!qdio_inbound_q_done(q)) {
 630                 qperf_inc(q, tasklet_inbound_resched2);
 631                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 632                         tasklet_schedule(&q->tasklet);
 633         }
 634 }
 635
 636 void qdio_inbound_processing(unsigned long data)
 637 {
 638         struct qdio_q *q = (struct qdio_q *)data;
 639         __qdio_inbound_processing(q);
 640 }
 641
 642 static int get_outbound_buffer_frontier(struct qdio_q *q)
 643 {
 644         int count, stop;
 645         unsigned char state;
 646
 647         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 648             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 649                 qdio_siga_sync_q(q);
 650
 651         /*
 652          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 653          * would return 0.
 654          */
 655         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 656         stop = add_buf(q->first_to_check, count);
 657
 658         if (q->first_to_check == stop)
 659                 return q->first_to_check;
 660
 661         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 662         if (!count)
 663                 return q->first_to_check;
 664
 665         switch (state) {
 666         case SLSB_P_OUTPUT_EMPTY:
 667                 /* the adapter got it */
 668                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
 669
 670                 atomic_sub(count, &q->nr_buf_used);
 671                 q->first_to_check = add_buf(q->first_to_check, count);
 672                 if (q->irq_ptr->perf_stat_enabled)
 673                         account_sbals(q, count);
 674                 break;
 675         case SLSB_P_OUTPUT_ERROR:
 676                 announce_buffer_error(q, count);
 677                 /* process the buffer, the upper layer will take care of it */
 678                 q->first_to_check = add_buf(q->first_to_check, count);
 679                 atomic_sub(count, &q->nr_buf_used);
 680                 if (q->irq_ptr->perf_stat_enabled)
 681                         account_sbals_error(q, count);
 682                 break;
 683         case SLSB_CU_OUTPUT_PRIMED:
 684                 /* the adapter has not fetched the output yet */
 685                 if (q->irq_ptr->perf_stat_enabled)
 686                         q->q_stats.nr_sbal_nop++;
 687                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 688                 break;
 689         case SLSB_P_OUTPUT_NOT_INIT:
 690         case SLSB_P_OUTPUT_HALTED:
 691                 break;
 692         default:
 693                 BUG();
 694         }
 695         return q->first_to_check;
 696 }
 697
 698 /* all buffers processed? */
 699 static inline int qdio_outbound_q_done(struct qdio_q *q)
 700 {
 701         return atomic_read(&q->nr_buf_used) == 0;
 702 }
 703
 704 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 705 {
 706         int bufnr;
 707
 708         bufnr = get_outbound_buffer_frontier(q);
 709
 710         if ((bufnr != q->last_move) || q->qdio_error) {
 711                 q->last_move = bufnr;
 712                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 713                 return 1;
 714         } else
 715                 return 0;
 716 }
 717
 718 static int qdio_kick_outbound_q(struct qdio_q *q)
 719 {
 720         unsigned int busy_bit;
 721         int cc;
 722
 723         if (!need_siga_out(q))
 724                 return 0;
 725
 726         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 727         qperf_inc(q, siga_write);
 728
 729         cc = qdio_siga_output(q, &busy_bit);
 730         switch (cc) {
 731         case 0:
 732                 break;
 733         case 2:
 734                 if (busy_bit) {
 735                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 736                         cc |= QDIO_ERROR_SIGA_BUSY;
 737                 } else
 738                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 739                 break;
 740         case 1:
 741         case 3:
 742                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 743                 break;
 744         }
 745         return cc;
 746 }
 747
 748 static void __qdio_outbound_processing(struct qdio_q *q)
 749 {
 750         qperf_inc(q, tasklet_outbound);
 751         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 752
 753         if (qdio_outbound_q_moved(q))
 754                 qdio_kick_handler(q);
 755
 756         if (queue_type(q) == QDIO_ZFCP_QFMT)
 757                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 758                         goto sched;
 759
 760         /* bail out for HiperSockets unicast queues */
 761         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 762                 return;
 763
 764         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 765             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 766                 goto sched;
 767
 768         if (q->u.out.pci_out_enabled)
 769                 return;
 770
 771         /*
 772          * Now we know that queue type is either qeth without pci enabled
 773          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 774          * EMPTY is noticed and outbound_handler is called after some time.
 775          */
 776         if (qdio_outbound_q_done(q))
 777                 del_timer(&q->u.out.timer);
 778         else
 779                 if (!timer_pending(&q->u.out.timer))
 780                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 781         return;
 782
 783 sched:
 784         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 785                 return;
 786         tasklet_schedule(&q->tasklet);
 787 }
 788
 789 /* outbound tasklet */
 790 void qdio_outbound_processing(unsigned long data)
 791 {
 792         struct qdio_q *q = (struct qdio_q *)data;
 793         __qdio_outbound_processing(q);
 794 }
 795
 796 void qdio_outbound_timer(unsigned long data)
 797 {
 798         struct qdio_q *q = (struct qdio_q *)data;
 799
 800         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 801                 return;
 802         tasklet_schedule(&q->tasklet);
 803 }
 804
 805 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 806 {
 807         struct qdio_q *out;
 808         int i;
 809
 810         if (!pci_out_supported(q))
 811                 return;
 812
 813         for_each_output_queue(q->irq_ptr, out, i)
 814                 if (!qdio_outbound_q_done(out))
 815                         tasklet_schedule(&out->tasklet);
 816 }
 817
 818 static void __tiqdio_inbound_processing(struct qdio_q *q)
 819 {
 820         qperf_inc(q, tasklet_inbound);
 821         qdio_sync_after_thinint(q);
 822
 823         /*
 824          * The interrupt could be caused by a PCI request. Check the
 825          * PCI capable outbound queues.
 826          */
 827         qdio_check_outbound_after_thinint(q);
 828
 829         if (!qdio_inbound_q_moved(q))
 830                 return;
 831
 832         qdio_kick_handler(q);
 833
 834         if (!qdio_inbound_q_done(q)) {
 835                 qperf_inc(q, tasklet_inbound_resched);
 836                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 837                         tasklet_schedule(&q->tasklet);
 838                         return;
 839                 }
 840         }
 841
 842         qdio_stop_polling(q);
 843         /*
 844          * We need to check again to not lose initiative after
 845          * resetting the ACK state.
 846          */
 847         if (!qdio_inbound_q_done(q)) {
 848                 qperf_inc(q, tasklet_inbound_resched2);
 849                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 850                         tasklet_schedule(&q->tasklet);
 851         }
 852 }
 853
 854 void tiqdio_inbound_processing(unsigned long data)
 855 {
 856         struct qdio_q *q = (struct qdio_q *)data;
 857         __tiqdio_inbound_processing(q);
 858 }
 859
 860 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 861                                   enum qdio_irq_states state)
 862 {
 863         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 864
 865         irq_ptr->state = state;
 866         mb();
 867 }
 868
 869 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 870 {
 871         if (irb->esw.esw0.erw.cons) {
 872                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 873                 DBF_ERROR_HEX(irb, 64);
 874                 DBF_ERROR_HEX(irb->ecw, 64);
 875         }
 876 }
 877
 878 /* PCI interrupt handler */
 879 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 880 {
 881         int i;
 882         struct qdio_q *q;
 883
 884         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 885                 return;
 886
 887         for_each_input_queue(irq_ptr, q, i) {
 888                 if (q->u.in.queue_start_poll) {
 889                         /* skip if polling is enabled or already in work */
 890                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 891                                      &q->u.in.queue_irq_state)) {
 892                                 qperf_inc(q, int_discarded);
 893                                 continue;
 894                         }
 895                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 896                                                  q->irq_ptr->int_parm);
 897                 } else
 898                         tasklet_schedule(&q->tasklet);
 899         }
 900
 901         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 902                 return;
 903
 904         for_each_output_queue(irq_ptr, q, i) {
 905                 if (qdio_outbound_q_done(q))
 906                         continue;
 907
 908                 if (!siga_syncs_out_pci(q))
 909                         qdio_siga_sync_q(q);
 910
 911                 tasklet_schedule(&q->tasklet);
 912         }
 913 }
 914
 915 static void qdio_handle_activate_check(struct ccw_device *cdev,
 916                                 unsigned long intparm, int cstat, int dstat)
 917 {
 918         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 919         struct qdio_q *q;
 920
 921         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 922         DBF_ERROR("intp :%lx", intparm);
 923         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 924
 925         if (irq_ptr->nr_input_qs) {
 926                 q = irq_ptr->input_qs[0];
 927         } else if (irq_ptr->nr_output_qs) {
 928                 q = irq_ptr->output_qs[0];
 929         } else {
 930                 dump_stack();
 931                 goto no_handler;
 932         }
 933         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 934                    0, -1, -1, irq_ptr->int_parm);
 935 no_handler:
 936         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 937 }
 938
 939 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 940                                       int dstat)
 941 {
 942         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 943
 944         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 945
 946         if (cstat)
 947                 goto error;
 948         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 949                 goto error;
 950         if (!(dstat & DEV_STAT_DEV_END))
 951                 goto error;
 952         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 953         return;
 954
 955 error:
 956         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 957         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 958         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 959 }
 960
 961 /* qdio interrupt handler */
 962 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 963                       struct irb *irb)
 964 {
 965         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 966         int cstat, dstat;
 967
 968         if (!intparm || !irq_ptr) {
 969                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 970                 return;
 971         }
 972
 973         if (irq_ptr->perf_stat_enabled)
 974                 irq_ptr->perf_stat.qdio_int++;
 975
 976         if (IS_ERR(irb)) {
 977                 switch (PTR_ERR(irb)) {
 978                 case -EIO:
 979                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 980                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 981                         wake_up(&cdev->private->wait_q);
 982                         return;
 983                 default:
 984                         WARN_ON(1);
 985                         return;
 986                 }
 987         }
 988         qdio_irq_check_sense(irq_ptr, irb);
 989         cstat = irb->scsw.cmd.cstat;
 990         dstat = irb->scsw.cmd.dstat;
 991
 992         switch (irq_ptr->state) {
 993         case QDIO_IRQ_STATE_INACTIVE:
 994                 qdio_establish_handle_irq(cdev, cstat, dstat);
 995                 break;
 996         case QDIO_IRQ_STATE_CLEANUP:
 997                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 998                 break;
 999         case QDIO_IRQ_STATE_ESTABLISHED:
1000         case QDIO_IRQ_STATE_ACTIVE:
1001                 if (cstat & SCHN_STAT_PCI) {
1002                         qdio_int_handler_pci(irq_ptr);
1003                         return;
1004                 }
1005                 if (cstat || dstat)
1006                         qdio_handle_activate_check(cdev, intparm, cstat,
1007                                                    dstat);
1008                 break;
1009         case QDIO_IRQ_STATE_STOPPED:
1010                 break;
1011         default:
1012                 WARN_ON(1);
1013         }
1014         wake_up(&cdev->private->wait_q);
1015 }
1016
1017 /**
1018  * qdio_get_ssqd_desc - get qdio subchannel description
1019  * @cdev: ccw device to get description for
1020  * @data: where to store the ssqd
1021  *
1022  * Returns 0 or an error code. The results of the chsc are stored in the
1023  * specified structure.
1024  */
1025 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1026                        struct qdio_ssqd_desc *data)
1027 {
1028
1029         if (!cdev || !cdev->private)
1030                 return -EINVAL;
1031
1032         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1033         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1034 }
1035 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1036
1037 static void qdio_shutdown_queues(struct ccw_device *cdev)
1038 {
1039         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1040         struct qdio_q *q;
1041         int i;
1042
1043         for_each_input_queue(irq_ptr, q, i)
1044                 tasklet_kill(&q->tasklet);
1045
1046         for_each_output_queue(irq_ptr, q, i) {
1047                 del_timer(&q->u.out.timer);
1048                 tasklet_kill(&q->tasklet);
1049         }
1050 }
1051
1052 /**
1053  * qdio_shutdown - shut down a qdio subchannel
1054  * @cdev: associated ccw device
1055  * @how: use halt or clear to shutdown
1056  */
1057 int qdio_shutdown(struct ccw_device *cdev, int how)
1058 {
1059         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1060         int rc;
1061         unsigned long flags;
1062
1063         if (!irq_ptr)
1064                 return -ENODEV;
1065
1066         BUG_ON(irqs_disabled());
1067         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1068
1069         mutex_lock(&irq_ptr->setup_mutex);
1070         /*
1071          * Subchannel was already shot down. We cannot prevent being called
1072          * twice since cio may trigger a shutdown asynchronously.
1073          */
1074         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1075                 mutex_unlock(&irq_ptr->setup_mutex);
1076                 return 0;
1077         }
1078
1079         /*
1080          * Indicate that the device is going down. Scheduling the queue
1081          * tasklets is forbidden from here on.
1082          */
1083         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1084
1085         tiqdio_remove_input_queues(irq_ptr);
1086         qdio_shutdown_queues(cdev);
1087         qdio_shutdown_debug_entries(irq_ptr, cdev);
1088
1089         /* cleanup subchannel */
1090         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1091
1092         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1093                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1094         else
1095                 /* default behaviour is halt */
1096                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1097         if (rc) {
1098                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1099                 DBF_ERROR("rc:%4d", rc);
1100                 goto no_cleanup;
1101         }
1102
1103         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1104         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1105         wait_event_interruptible_timeout(cdev->private->wait_q,
1106                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1107                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1108                 10 * HZ);
1109         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1110
1111 no_cleanup:
1112         qdio_shutdown_thinint(irq_ptr);
1113
1114         /* restore interrupt handler */
1115         if ((void *)cdev->handler == (void *)qdio_int_handler)
1116                 cdev->handler = irq_ptr->orig_handler;
1117         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1118
1119         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1120         mutex_unlock(&irq_ptr->setup_mutex);
1121         if (rc)
1122                 return rc;
1123         return 0;
1124 }
1125 EXPORT_SYMBOL_GPL(qdio_shutdown);
1126
1127 /**
1128  * qdio_free - free data structures for a qdio subchannel
1129  * @cdev: associated ccw device
1130  */
1131 int qdio_free(struct ccw_device *cdev)
1132 {
1133         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1134
1135         if (!irq_ptr)
1136                 return -ENODEV;
1137
1138         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1139         mutex_lock(&irq_ptr->setup_mutex);
1140
1141         if (irq_ptr->debug_area != NULL) {
1142                 debug_unregister(irq_ptr->debug_area);
1143                 irq_ptr->debug_area = NULL;
1144         }
1145         cdev->private->qdio_data = NULL;
1146         mutex_unlock(&irq_ptr->setup_mutex);
1147
1148         qdio_release_memory(irq_ptr);
1149         return 0;
1150 }
1151 EXPORT_SYMBOL_GPL(qdio_free);
1152
1153 /**
1154  * qdio_allocate - allocate qdio queues and associated data
1155  * @init_data: initialization data
1156  */
1157 int qdio_allocate(struct qdio_initialize *init_data)
1158 {
1159         struct qdio_irq *irq_ptr;
1160
1161         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1162
1163         if ((init_data->no_input_qs && !init_data->input_handler) ||
1164             (init_data->no_output_qs && !init_data->output_handler))
1165                 return -EINVAL;
1166
1167         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1168             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1169                 return -EINVAL;
1170
1171         if ((!init_data->input_sbal_addr_array) ||
1172             (!init_data->output_sbal_addr_array))
1173                 return -EINVAL;
1174
1175         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1176         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1177         if (!irq_ptr)
1178                 goto out_err;
1179
1180         mutex_init(&irq_ptr->setup_mutex);
1181         qdio_allocate_dbf(init_data, irq_ptr);
1182
1183         /*
1184          * Allocate a page for the chsc calls in qdio_establish.
1185          * Must be pre-allocated since a zfcp recovery will call
1186          * qdio_establish. In case of low memory and swap on a zfcp disk
1187          * we may not be able to allocate memory otherwise.
1188          */
1189         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1190         if (!irq_ptr->chsc_page)
1191                 goto out_rel;
1192
1193         /* qdr is used in ccw1.cda which is u32 */
1194         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1195         if (!irq_ptr->qdr)
1196                 goto out_rel;
1197         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1198
1199         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1200                              init_data->no_output_qs))
1201                 goto out_rel;
1202
1203         init_data->cdev->private->qdio_data = irq_ptr;
1204         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1205         return 0;
1206 out_rel:
1207         qdio_release_memory(irq_ptr);
1208 out_err:
1209         return -ENOMEM;
1210 }
1211 EXPORT_SYMBOL_GPL(qdio_allocate);
1212
1213 /**
1214  * qdio_establish - establish queues on a qdio subchannel
1215  * @init_data: initialization data
1216  */
1217 int qdio_establish(struct qdio_initialize *init_data)
1218 {
1219         struct qdio_irq *irq_ptr;
1220         struct ccw_device *cdev = init_data->cdev;
1221         unsigned long saveflags;
1222         int rc;
1223
1224         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1225
1226         irq_ptr = cdev->private->qdio_data;
1227         if (!irq_ptr)
1228                 return -ENODEV;
1229
1230         if (cdev->private->state != DEV_STATE_ONLINE)
1231                 return -EINVAL;
1232
1233         mutex_lock(&irq_ptr->setup_mutex);
1234         qdio_setup_irq(init_data);
1235
1236         rc = qdio_establish_thinint(irq_ptr);
1237         if (rc) {
1238                 mutex_unlock(&irq_ptr->setup_mutex);
1239                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1240                 return rc;
1241         }
1242
1243         /* establish q */
1244         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1245         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1246         irq_ptr->ccw.count = irq_ptr->equeue.count;
1247         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1248
1249         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1250         ccw_device_set_options_mask(cdev, 0);
1251
1252         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1253         if (rc) {
1254                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1255                 DBF_ERROR("rc:%4x", rc);
1256         }
1257         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1258
1259         if (rc) {
1260                 mutex_unlock(&irq_ptr->setup_mutex);
1261                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1262                 return rc;
1263         }
1264
1265         wait_event_interruptible_timeout(cdev->private->wait_q,
1266                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1267                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1268
1269         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1270                 mutex_unlock(&irq_ptr->setup_mutex);
1271                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1272                 return -EIO;
1273         }
1274
1275         qdio_setup_ssqd_info(irq_ptr);
1276         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1277         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1278
1279         /* qebsm is now setup if available, initialize buffer states */
1280         qdio_init_buf_states(irq_ptr);
1281
1282         mutex_unlock(&irq_ptr->setup_mutex);
1283         qdio_print_subchannel_info(irq_ptr, cdev);
1284         qdio_setup_debug_entries(irq_ptr, cdev);
1285         return 0;
1286 }
1287 EXPORT_SYMBOL_GPL(qdio_establish);
1288
1289 /**
1290  * qdio_activate - activate queues on a qdio subchannel
1291  * @cdev: associated cdev
1292  */
1293 int qdio_activate(struct ccw_device *cdev)
1294 {
1295         struct qdio_irq *irq_ptr;
1296         int rc;
1297         unsigned long saveflags;
1298
1299         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1300
1301         irq_ptr = cdev->private->qdio_data;
1302         if (!irq_ptr)
1303                 return -ENODEV;
1304
1305         if (cdev->private->state != DEV_STATE_ONLINE)
1306                 return -EINVAL;
1307
1308         mutex_lock(&irq_ptr->setup_mutex);
1309         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1310                 rc = -EBUSY;
1311                 goto out;
1312         }
1313
1314         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1315         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1316         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1317         irq_ptr->ccw.cda = 0;
1318
1319         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1320         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1321
1322         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1323                               0, DOIO_DENY_PREFETCH);
1324         if (rc) {
1325                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1326                 DBF_ERROR("rc:%4x", rc);
1327         }
1328         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1329
1330         if (rc)
1331                 goto out;
1332
1333         if (is_thinint_irq(irq_ptr))
1334                 tiqdio_add_input_queues(irq_ptr);
1335
1336         /* wait for subchannel to become active */
1337         msleep(5);
1338
1339         switch (irq_ptr->state) {
1340         case QDIO_IRQ_STATE_STOPPED:
1341         case QDIO_IRQ_STATE_ERR:
1342                 rc = -EIO;
1343                 break;
1344         default:
1345                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1346                 rc = 0;
1347         }
1348 out:
1349         mutex_unlock(&irq_ptr->setup_mutex);
1350         return rc;
1351 }
1352 EXPORT_SYMBOL_GPL(qdio_activate);
1353
1354 static inline int buf_in_between(int bufnr, int start, int count)
1355 {
1356         int end = add_buf(start, count);
1357
1358         if (end > start) {
1359                 if (bufnr >= start && bufnr < end)
1360                         return 1;
1361                 else
1362                         return 0;
1363         }
1364
1365         /* wrap-around case */
1366         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1367             (bufnr < end))
1368                 return 1;
1369         else
1370                 return 0;
1371 }
1372
1373 /**
1374  * handle_inbound - reset processed input buffers
1375  * @q: queue containing the buffers
1376  * @callflags: flags
1377  * @bufnr: first buffer to process
1378  * @count: how many buffers are emptied
1379  */
1380 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1381                           int bufnr, int count)
1382 {
1383         int used, diff;
1384
1385         qperf_inc(q, inbound_call);
1386
1387         if (!q->u.in.polling)
1388                 goto set;
1389
1390         /* protect against stop polling setting an ACK for an emptied slsb */
1391         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1392                 /* overwriting everything, just delete polling status */
1393                 q->u.in.polling = 0;
1394                 q->u.in.ack_count = 0;
1395                 goto set;
1396         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1397                 if (is_qebsm(q)) {
1398                         /* partial overwrite, just update ack_start */
1399                         diff = add_buf(bufnr, count);
1400                         diff = sub_buf(diff, q->u.in.ack_start);
1401                         q->u.in.ack_count -= diff;
1402                         if (q->u.in.ack_count <= 0) {
1403                                 q->u.in.polling = 0;
1404                                 q->u.in.ack_count = 0;
1405                                 goto set;
1406                         }
1407                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1408                 }
1409                 else
1410                         /* the only ACK will be deleted, so stop polling */
1411                         q->u.in.polling = 0;
1412         }
1413
1414 set:
1415         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1416
1417         used = atomic_add_return(count, &q->nr_buf_used) - count;
1418         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1419
1420         /* no need to signal as long as the adapter had free buffers */
1421         if (used)
1422                 return 0;
1423
1424         if (need_siga_in(q))
1425                 return qdio_siga_input(q);
1426         return 0;
1427 }
1428
1429 /**
1430  * handle_outbound - process filled outbound buffers
1431  * @q: queue containing the buffers
1432  * @callflags: flags
1433  * @bufnr: first buffer to process
1434  * @count: how many buffers are filled
1435  */
1436 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1437                            int bufnr, int count)
1438 {
1439         unsigned char state;
1440         int used, rc = 0;
1441
1442         qperf_inc(q, outbound_call);
1443
1444         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1445         used = atomic_add_return(count, &q->nr_buf_used);
1446         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1447
1448         if (callflags & QDIO_FLAG_PCI_OUT) {
1449                 q->u.out.pci_out_enabled = 1;
1450                 qperf_inc(q, pci_request_int);
1451         }
1452         else
1453                 q->u.out.pci_out_enabled = 0;
1454
1455         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1456                 if (multicast_outbound(q))
1457                         rc = qdio_kick_outbound_q(q);
1458                 else
1459                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1460                             (count > 1) &&
1461                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1462                                 /* exploit enhanced SIGA */
1463                                 q->u.out.use_enh_siga = 1;
1464                                 rc = qdio_kick_outbound_q(q);
1465                         } else {
1466                                 /*
1467                                 * One siga-w per buffer required for unicast
1468                                 * HiperSockets.
1469                                 */
1470                                 q->u.out.use_enh_siga = 0;
1471                                 while (count--) {
1472                                         rc = qdio_kick_outbound_q(q);
1473                                         if (rc)
1474                                                 goto out;
1475                                 }
1476                         }
1477                 goto out;
1478         }
1479
1480         if (need_siga_sync(q)) {
1481                 qdio_siga_sync_q(q);
1482                 goto out;
1483         }
1484
1485         /* try to fast requeue buffers */
1486         get_buf_state(q, prev_buf(bufnr), &state, 0);
1487         if (state != SLSB_CU_OUTPUT_PRIMED)
1488                 rc = qdio_kick_outbound_q(q);
1489         else
1490                 qperf_inc(q, fast_requeue);
1491
1492 out:
1493         tasklet_schedule(&q->tasklet);
1494         return rc;
1495 }
1496
1497 /**
1498  * do_QDIO - process input or output buffers
1499  * @cdev: associated ccw_device for the qdio subchannel
1500  * @callflags: input or output and special flags from the program
1501  * @q_nr: queue number
1502  * @bufnr: buffer number
1503  * @count: how many buffers to process
1504  */
1505 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1506             int q_nr, unsigned int bufnr, unsigned int count)
1507 {
1508         struct qdio_irq *irq_ptr;
1509
1510         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1511                 return -EINVAL;
1512
1513         irq_ptr = cdev->private->qdio_data;
1514         if (!irq_ptr)
1515                 return -ENODEV;
1516
1517         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1518                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1519
1520         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1521                 return -EBUSY;
1522
1523         if (callflags & QDIO_FLAG_SYNC_INPUT)
1524                 return handle_inbound(irq_ptr->input_qs[q_nr],
1525                                       callflags, bufnr, count);
1526         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1527                 return handle_outbound(irq_ptr->output_qs[q_nr],
1528                                        callflags, bufnr, count);
1529         return -EINVAL;
1530 }
1531 EXPORT_SYMBOL_GPL(do_QDIO);
1532
1533 /**
1534  * qdio_start_irq - process input buffers
1535  * @cdev: associated ccw_device for the qdio subchannel
1536  * @nr: input queue number
1537  *
1538  * Return codes
1539  *   0 - success
1540  *   1 - irqs not started since new data is available
1541  */
1542 int qdio_start_irq(struct ccw_device *cdev, int nr)
1543 {
1544         struct qdio_q *q;
1545         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1546
1547         if (!irq_ptr)
1548                 return -ENODEV;
1549         q = irq_ptr->input_qs[nr];
1550
1551         WARN_ON(queue_irqs_enabled(q));
1552
1553         if (!shared_ind(q->irq_ptr))
1554                 xchg(q->irq_ptr->dsci, 0);
1555
1556         qdio_stop_polling(q);
1557         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1558
1559         /*
1560          * We need to check again to not lose initiative after
1561          * resetting the ACK state.
1562          */
1563         if (!shared_ind(q->irq_ptr) && *q->irq_ptr->dsci)
1564                 goto rescan;
1565         if (!qdio_inbound_q_done(q))
1566                 goto rescan;
1567         return 0;
1568
1569 rescan:
1570         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1571                              &q->u.in.queue_irq_state))
1572                 return 0;
1573         else
1574                 return 1;
1575
1576 }
1577 EXPORT_SYMBOL(qdio_start_irq);
1578
1579 /**
1580  * qdio_get_next_buffers - process input buffers
1581  * @cdev: associated ccw_device for the qdio subchannel
1582  * @nr: input queue number
1583  * @bufnr: first filled buffer number
1584  * @error: buffers are in error state
1585  *
1586  * Return codes
1587  *   < 0 - error
1588  *   = 0 - no new buffers found
1589  *   > 0 - number of processed buffers
1590  */
1591 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1592                           int *error)
1593 {
1594         struct qdio_q *q;
1595         int start, end;
1596         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1597
1598         if (!irq_ptr)
1599                 return -ENODEV;
1600         q = irq_ptr->input_qs[nr];
1601         WARN_ON(queue_irqs_enabled(q));
1602
1603         qdio_sync_after_thinint(q);
1604
1605         /*
1606          * The interrupt could be caused by a PCI request. Check the
1607          * PCI capable outbound queues.
1608          */
1609         qdio_check_outbound_after_thinint(q);
1610
1611         if (!qdio_inbound_q_moved(q))
1612                 return 0;
1613
1614         /* Note: upper-layer MUST stop processing immediately here ... */
1615         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1616                 return -EIO;
1617
1618         start = q->first_to_kick;
1619         end = q->first_to_check;
1620         *bufnr = start;
1621         *error = q->qdio_error;
1622
1623         /* for the next time */
1624         q->first_to_kick = end;
1625         q->qdio_error = 0;
1626         return sub_buf(end, start);
1627 }
1628 EXPORT_SYMBOL(qdio_get_next_buffers);
1629
1630 /**
1631  * qdio_stop_irq - disable interrupt processing for the device
1632  * @cdev: associated ccw_device for the qdio subchannel
1633  * @nr: input queue number
1634  *
1635  * Return codes
1636  *   0 - interrupts were already disabled
1637  *   1 - interrupts successfully disabled
1638  */
1639 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1640 {
1641         struct qdio_q *q;
1642         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1643
1644         if (!irq_ptr)
1645                 return -ENODEV;
1646         q = irq_ptr->input_qs[nr];
1647
1648         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1649                              &q->u.in.queue_irq_state))
1650                 return 0;
1651         else
1652                 return 1;
1653 }
1654 EXPORT_SYMBOL(qdio_stop_irq);
1655
1656 static int __init init_QDIO(void)
1657 {
1658         int rc;
1659
1660         rc = qdio_setup_init();
1661         if (rc)
1662                 return rc;
1663         rc = tiqdio_allocate_memory();
1664         if (rc)
1665                 goto out_cache;
1666         rc = qdio_debug_init();
1667         if (rc)
1668                 goto out_ti;
1669         rc = tiqdio_register_thinints();
1670         if (rc)
1671                 goto out_debug;
1672         return 0;
1673
1674 out_debug:
1675         qdio_debug_exit();
1676 out_ti:
1677         tiqdio_free_memory();
1678 out_cache:
1679         qdio_setup_exit();
1680         return rc;
1681 }
1682
1683 static void __exit exit_QDIO(void)
1684 {
1685         tiqdio_unregister_thinints();
1686         tiqdio_free_memory();
1687         qdio_debug_exit();
1688         qdio_setup_exit();
1689 }
1690
1691 module_init(init_QDIO);
1692 module_exit(exit_QDIO);