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_usecs();
 340                         goto again;
 341                 }
 342                 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 343                         goto again;
 344         }
 345         return cc;
 346 }
 347
 348 static inline int qdio_siga_input(struct qdio_q *q)
 349 {
 350         int cc;
 351
 352         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 353         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_usecs();
 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_usecs() > 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 again:
 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                 goto again;
 619         }
 620
 621         qdio_stop_polling(q);
 622         /*
 623          * We need to check again to not lose initiative after
 624          * resetting the ACK state.
 625          */
 626         if (!qdio_inbound_q_done(q)) {
 627                 qperf_inc(q, tasklet_inbound_resched2);
 628                 goto again;
 629         }
 630 }
 631
 632 void qdio_inbound_processing(unsigned long data)
 633 {
 634         struct qdio_q *q = (struct qdio_q *)data;
 635         __qdio_inbound_processing(q);
 636 }
 637
 638 static int get_outbound_buffer_frontier(struct qdio_q *q)
 639 {
 640         int count, stop;
 641         unsigned char state;
 642
 643         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 644             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 645                 qdio_siga_sync_q(q);
 646
 647         /*
 648          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 649          * would return 0.
 650          */
 651         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 652         stop = add_buf(q->first_to_check, count);
 653
 654         if (q->first_to_check == stop)
 655                 return q->first_to_check;
 656
 657         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 658         if (!count)
 659                 return q->first_to_check;
 660
 661         switch (state) {
 662         case SLSB_P_OUTPUT_EMPTY:
 663                 /* the adapter got it */
 664                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
 665
 666                 atomic_sub(count, &q->nr_buf_used);
 667                 q->first_to_check = add_buf(q->first_to_check, count);
 668                 if (q->irq_ptr->perf_stat_enabled)
 669                         account_sbals(q, count);
 670                 break;
 671         case SLSB_P_OUTPUT_ERROR:
 672                 announce_buffer_error(q, count);
 673                 /* process the buffer, the upper layer will take care of it */
 674                 q->first_to_check = add_buf(q->first_to_check, count);
 675                 atomic_sub(count, &q->nr_buf_used);
 676                 if (q->irq_ptr->perf_stat_enabled)
 677                         account_sbals_error(q, count);
 678                 break;
 679         case SLSB_CU_OUTPUT_PRIMED:
 680                 /* the adapter has not fetched the output yet */
 681                 if (q->irq_ptr->perf_stat_enabled)
 682                         q->q_stats.nr_sbal_nop++;
 683                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 684                 break;
 685         case SLSB_P_OUTPUT_NOT_INIT:
 686         case SLSB_P_OUTPUT_HALTED:
 687                 break;
 688         default:
 689                 BUG();
 690         }
 691         return q->first_to_check;
 692 }
 693
 694 /* all buffers processed? */
 695 static inline int qdio_outbound_q_done(struct qdio_q *q)
 696 {
 697         return atomic_read(&q->nr_buf_used) == 0;
 698 }
 699
 700 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 701 {
 702         int bufnr;
 703
 704         bufnr = get_outbound_buffer_frontier(q);
 705
 706         if ((bufnr != q->last_move) || q->qdio_error) {
 707                 q->last_move = bufnr;
 708                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 709                 return 1;
 710         } else
 711                 return 0;
 712 }
 713
 714 static int qdio_kick_outbound_q(struct qdio_q *q)
 715 {
 716         unsigned int busy_bit;
 717         int cc;
 718
 719         if (!need_siga_out(q))
 720                 return 0;
 721
 722         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 723         qperf_inc(q, siga_write);
 724
 725         cc = qdio_siga_output(q, &busy_bit);
 726         switch (cc) {
 727         case 0:
 728                 break;
 729         case 2:
 730                 if (busy_bit) {
 731                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 732                         cc |= QDIO_ERROR_SIGA_BUSY;
 733                 } else
 734                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 735                 break;
 736         case 1:
 737         case 3:
 738                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 739                 break;
 740         }
 741         return cc;
 742 }
 743
 744 static void __qdio_outbound_processing(struct qdio_q *q)
 745 {
 746         qperf_inc(q, tasklet_outbound);
 747         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 748
 749         if (qdio_outbound_q_moved(q))
 750                 qdio_kick_handler(q);
 751
 752         if (queue_type(q) == QDIO_ZFCP_QFMT)
 753                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 754                         goto sched;
 755
 756         /* bail out for HiperSockets unicast queues */
 757         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 758                 return;
 759
 760         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 761             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 762                 goto sched;
 763
 764         if (q->u.out.pci_out_enabled)
 765                 return;
 766
 767         /*
 768          * Now we know that queue type is either qeth without pci enabled
 769          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 770          * EMPTY is noticed and outbound_handler is called after some time.
 771          */
 772         if (qdio_outbound_q_done(q))
 773                 del_timer(&q->u.out.timer);
 774         else
 775                 if (!timer_pending(&q->u.out.timer))
 776                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 777         return;
 778
 779 sched:
 780         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 781                 return;
 782         tasklet_schedule(&q->tasklet);
 783 }
 784
 785 /* outbound tasklet */
 786 void qdio_outbound_processing(unsigned long data)
 787 {
 788         struct qdio_q *q = (struct qdio_q *)data;
 789         __qdio_outbound_processing(q);
 790 }
 791
 792 void qdio_outbound_timer(unsigned long data)
 793 {
 794         struct qdio_q *q = (struct qdio_q *)data;
 795
 796         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 797                 return;
 798         tasklet_schedule(&q->tasklet);
 799 }
 800
 801 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 802 {
 803         struct qdio_q *out;
 804         int i;
 805
 806         if (!pci_out_supported(q))
 807                 return;
 808
 809         for_each_output_queue(q->irq_ptr, out, i)
 810                 if (!qdio_outbound_q_done(out))
 811                         tasklet_schedule(&out->tasklet);
 812 }
 813
 814 static void __tiqdio_inbound_processing(struct qdio_q *q)
 815 {
 816         qperf_inc(q, tasklet_inbound);
 817         qdio_sync_after_thinint(q);
 818
 819         /*
 820          * The interrupt could be caused by a PCI request. Check the
 821          * PCI capable outbound queues.
 822          */
 823         qdio_check_outbound_after_thinint(q);
 824
 825         if (!qdio_inbound_q_moved(q))
 826                 return;
 827
 828         qdio_kick_handler(q);
 829
 830         if (!qdio_inbound_q_done(q)) {
 831                 qperf_inc(q, tasklet_inbound_resched);
 832                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 833                         tasklet_schedule(&q->tasklet);
 834                         return;
 835                 }
 836         }
 837
 838         qdio_stop_polling(q);
 839         /*
 840          * We need to check again to not lose initiative after
 841          * resetting the ACK state.
 842          */
 843         if (!qdio_inbound_q_done(q)) {
 844                 qperf_inc(q, tasklet_inbound_resched2);
 845                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 846                         tasklet_schedule(&q->tasklet);
 847         }
 848 }
 849
 850 void tiqdio_inbound_processing(unsigned long data)
 851 {
 852         struct qdio_q *q = (struct qdio_q *)data;
 853         __tiqdio_inbound_processing(q);
 854 }
 855
 856 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 857                                   enum qdio_irq_states state)
 858 {
 859         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 860
 861         irq_ptr->state = state;
 862         mb();
 863 }
 864
 865 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 866 {
 867         if (irb->esw.esw0.erw.cons) {
 868                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 869                 DBF_ERROR_HEX(irb, 64);
 870                 DBF_ERROR_HEX(irb->ecw, 64);
 871         }
 872 }
 873
 874 /* PCI interrupt handler */
 875 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 876 {
 877         int i;
 878         struct qdio_q *q;
 879
 880         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 881                 return;
 882
 883         for_each_input_queue(irq_ptr, q, i)
 884                 tasklet_schedule(&q->tasklet);
 885
 886         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 887                 return;
 888
 889         for_each_output_queue(irq_ptr, q, i) {
 890                 if (qdio_outbound_q_done(q))
 891                         continue;
 892
 893                 if (!siga_syncs_out_pci(q))
 894                         qdio_siga_sync_q(q);
 895
 896                 tasklet_schedule(&q->tasklet);
 897         }
 898 }
 899
 900 static void qdio_handle_activate_check(struct ccw_device *cdev,
 901                                 unsigned long intparm, int cstat, int dstat)
 902 {
 903         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 904         struct qdio_q *q;
 905
 906         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 907         DBF_ERROR("intp :%lx", intparm);
 908         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 909
 910         if (irq_ptr->nr_input_qs) {
 911                 q = irq_ptr->input_qs[0];
 912         } else if (irq_ptr->nr_output_qs) {
 913                 q = irq_ptr->output_qs[0];
 914         } else {
 915                 dump_stack();
 916                 goto no_handler;
 917         }
 918         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 919                    0, -1, -1, irq_ptr->int_parm);
 920 no_handler:
 921         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 922 }
 923
 924 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 925                                       int dstat)
 926 {
 927         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 928
 929         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 930
 931         if (cstat)
 932                 goto error;
 933         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 934                 goto error;
 935         if (!(dstat & DEV_STAT_DEV_END))
 936                 goto error;
 937         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 938         return;
 939
 940 error:
 941         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 942         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 943         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 944 }
 945
 946 /* qdio interrupt handler */
 947 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 948                       struct irb *irb)
 949 {
 950         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 951         int cstat, dstat;
 952
 953         if (!intparm || !irq_ptr) {
 954                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 955                 return;
 956         }
 957
 958         if (IS_ERR(irb)) {
 959                 switch (PTR_ERR(irb)) {
 960                 case -EIO:
 961                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 962                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 963                         wake_up(&cdev->private->wait_q);
 964                         return;
 965                 default:
 966                         WARN_ON(1);
 967                         return;
 968                 }
 969         }
 970         qdio_irq_check_sense(irq_ptr, irb);
 971         cstat = irb->scsw.cmd.cstat;
 972         dstat = irb->scsw.cmd.dstat;
 973
 974         switch (irq_ptr->state) {
 975         case QDIO_IRQ_STATE_INACTIVE:
 976                 qdio_establish_handle_irq(cdev, cstat, dstat);
 977                 break;
 978         case QDIO_IRQ_STATE_CLEANUP:
 979                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 980                 break;
 981         case QDIO_IRQ_STATE_ESTABLISHED:
 982         case QDIO_IRQ_STATE_ACTIVE:
 983                 if (cstat & SCHN_STAT_PCI) {
 984                         qdio_int_handler_pci(irq_ptr);
 985                         return;
 986                 }
 987                 if (cstat || dstat)
 988                         qdio_handle_activate_check(cdev, intparm, cstat,
 989                                                    dstat);
 990                 break;
 991         case QDIO_IRQ_STATE_STOPPED:
 992                 break;
 993         default:
 994                 WARN_ON(1);
 995         }
 996         wake_up(&cdev->private->wait_q);
 997 }
 998
 999 /**
1000  * qdio_get_ssqd_desc - get qdio subchannel description
1001  * @cdev: ccw device to get description for
1002  * @data: where to store the ssqd
1003  *
1004  * Returns 0 or an error code. The results of the chsc are stored in the
1005  * specified structure.
1006  */
1007 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1008                        struct qdio_ssqd_desc *data)
1009 {
1010
1011         if (!cdev || !cdev->private)
1012                 return -EINVAL;
1013
1014         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1015         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1016 }
1017 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1018
1019 /**
1020  * qdio_cleanup - shutdown queues and free data structures
1021  * @cdev: associated ccw device
1022  * @how: use halt or clear to shutdown
1023  *
1024  * This function calls qdio_shutdown() for @cdev with method @how.
1025  * and qdio_free(). The qdio_free() return value is ignored since
1026  * !irq_ptr is already checked.
1027  */
1028 int qdio_cleanup(struct ccw_device *cdev, int how)
1029 {
1030         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1031         int rc;
1032
1033         if (!irq_ptr)
1034                 return -ENODEV;
1035
1036         rc = qdio_shutdown(cdev, how);
1037
1038         qdio_free(cdev);
1039         return rc;
1040 }
1041 EXPORT_SYMBOL_GPL(qdio_cleanup);
1042
1043 static void qdio_shutdown_queues(struct ccw_device *cdev)
1044 {
1045         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1046         struct qdio_q *q;
1047         int i;
1048
1049         for_each_input_queue(irq_ptr, q, i)
1050                 tasklet_kill(&q->tasklet);
1051
1052         for_each_output_queue(irq_ptr, q, i) {
1053                 del_timer(&q->u.out.timer);
1054                 tasklet_kill(&q->tasklet);
1055         }
1056 }
1057
1058 /**
1059  * qdio_shutdown - shut down a qdio subchannel
1060  * @cdev: associated ccw device
1061  * @how: use halt or clear to shutdown
1062  */
1063 int qdio_shutdown(struct ccw_device *cdev, int how)
1064 {
1065         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1066         int rc;
1067         unsigned long flags;
1068
1069         if (!irq_ptr)
1070                 return -ENODEV;
1071
1072         BUG_ON(irqs_disabled());
1073         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1074
1075         mutex_lock(&irq_ptr->setup_mutex);
1076         /*
1077          * Subchannel was already shot down. We cannot prevent being called
1078          * twice since cio may trigger a shutdown asynchronously.
1079          */
1080         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1081                 mutex_unlock(&irq_ptr->setup_mutex);
1082                 return 0;
1083         }
1084
1085         /*
1086          * Indicate that the device is going down. Scheduling the queue
1087          * tasklets is forbidden from here on.
1088          */
1089         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1090
1091         tiqdio_remove_input_queues(irq_ptr);
1092         qdio_shutdown_queues(cdev);
1093         qdio_shutdown_debug_entries(irq_ptr, cdev);
1094
1095         /* cleanup subchannel */
1096         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1097
1098         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1099                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1100         else
1101                 /* default behaviour is halt */
1102                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1103         if (rc) {
1104                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1105                 DBF_ERROR("rc:%4d", rc);
1106                 goto no_cleanup;
1107         }
1108
1109         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1110         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1111         wait_event_interruptible_timeout(cdev->private->wait_q,
1112                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1113                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1114                 10 * HZ);
1115         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1116
1117 no_cleanup:
1118         qdio_shutdown_thinint(irq_ptr);
1119
1120         /* restore interrupt handler */
1121         if ((void *)cdev->handler == (void *)qdio_int_handler)
1122                 cdev->handler = irq_ptr->orig_handler;
1123         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1124
1125         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1126         mutex_unlock(&irq_ptr->setup_mutex);
1127         if (rc)
1128                 return rc;
1129         return 0;
1130 }
1131 EXPORT_SYMBOL_GPL(qdio_shutdown);
1132
1133 /**
1134  * qdio_free - free data structures for a qdio subchannel
1135  * @cdev: associated ccw device
1136  */
1137 int qdio_free(struct ccw_device *cdev)
1138 {
1139         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1140
1141         if (!irq_ptr)
1142                 return -ENODEV;
1143
1144         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1145         mutex_lock(&irq_ptr->setup_mutex);
1146
1147         if (irq_ptr->debug_area != NULL) {
1148                 debug_unregister(irq_ptr->debug_area);
1149                 irq_ptr->debug_area = NULL;
1150         }
1151         cdev->private->qdio_data = NULL;
1152         mutex_unlock(&irq_ptr->setup_mutex);
1153
1154         qdio_release_memory(irq_ptr);
1155         return 0;
1156 }
1157 EXPORT_SYMBOL_GPL(qdio_free);
1158
1159 /**
1160  * qdio_initialize - allocate and establish queues for a qdio subchannel
1161  * @init_data: initialization data
1162  *
1163  * This function first allocates queues via qdio_allocate() and on success
1164  * establishes them via qdio_establish().
1165  */
1166 int qdio_initialize(struct qdio_initialize *init_data)
1167 {
1168         int rc;
1169
1170         rc = qdio_allocate(init_data);
1171         if (rc)
1172                 return rc;
1173
1174         rc = qdio_establish(init_data);
1175         if (rc)
1176                 qdio_free(init_data->cdev);
1177         return rc;
1178 }
1179 EXPORT_SYMBOL_GPL(qdio_initialize);
1180
1181 /**
1182  * qdio_allocate - allocate qdio queues and associated data
1183  * @init_data: initialization data
1184  */
1185 int qdio_allocate(struct qdio_initialize *init_data)
1186 {
1187         struct qdio_irq *irq_ptr;
1188
1189         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1190
1191         if ((init_data->no_input_qs && !init_data->input_handler) ||
1192             (init_data->no_output_qs && !init_data->output_handler))
1193                 return -EINVAL;
1194
1195         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1196             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1197                 return -EINVAL;
1198
1199         if ((!init_data->input_sbal_addr_array) ||
1200             (!init_data->output_sbal_addr_array))
1201                 return -EINVAL;
1202
1203         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1204         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1205         if (!irq_ptr)
1206                 goto out_err;
1207
1208         mutex_init(&irq_ptr->setup_mutex);
1209         qdio_allocate_dbf(init_data, irq_ptr);
1210
1211         /*
1212          * Allocate a page for the chsc calls in qdio_establish.
1213          * Must be pre-allocated since a zfcp recovery will call
1214          * qdio_establish. In case of low memory and swap on a zfcp disk
1215          * we may not be able to allocate memory otherwise.
1216          */
1217         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1218         if (!irq_ptr->chsc_page)
1219                 goto out_rel;
1220
1221         /* qdr is used in ccw1.cda which is u32 */
1222         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1223         if (!irq_ptr->qdr)
1224                 goto out_rel;
1225         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1226
1227         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1228                              init_data->no_output_qs))
1229                 goto out_rel;
1230
1231         init_data->cdev->private->qdio_data = irq_ptr;
1232         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1233         return 0;
1234 out_rel:
1235         qdio_release_memory(irq_ptr);
1236 out_err:
1237         return -ENOMEM;
1238 }
1239 EXPORT_SYMBOL_GPL(qdio_allocate);
1240
1241 /**
1242  * qdio_establish - establish queues on a qdio subchannel
1243  * @init_data: initialization data
1244  */
1245 int qdio_establish(struct qdio_initialize *init_data)
1246 {
1247         struct qdio_irq *irq_ptr;
1248         struct ccw_device *cdev = init_data->cdev;
1249         unsigned long saveflags;
1250         int rc;
1251
1252         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1253
1254         irq_ptr = cdev->private->qdio_data;
1255         if (!irq_ptr)
1256                 return -ENODEV;
1257
1258         if (cdev->private->state != DEV_STATE_ONLINE)
1259                 return -EINVAL;
1260
1261         mutex_lock(&irq_ptr->setup_mutex);
1262         qdio_setup_irq(init_data);
1263
1264         rc = qdio_establish_thinint(irq_ptr);
1265         if (rc) {
1266                 mutex_unlock(&irq_ptr->setup_mutex);
1267                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1268                 return rc;
1269         }
1270
1271         /* establish q */
1272         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1273         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1274         irq_ptr->ccw.count = irq_ptr->equeue.count;
1275         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1276
1277         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1278         ccw_device_set_options_mask(cdev, 0);
1279
1280         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1281         if (rc) {
1282                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1283                 DBF_ERROR("rc:%4x", rc);
1284         }
1285         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1286
1287         if (rc) {
1288                 mutex_unlock(&irq_ptr->setup_mutex);
1289                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1290                 return rc;
1291         }
1292
1293         wait_event_interruptible_timeout(cdev->private->wait_q,
1294                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1295                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1296
1297         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1298                 mutex_unlock(&irq_ptr->setup_mutex);
1299                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1300                 return -EIO;
1301         }
1302
1303         qdio_setup_ssqd_info(irq_ptr);
1304         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1305         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1306
1307         /* qebsm is now setup if available, initialize buffer states */
1308         qdio_init_buf_states(irq_ptr);
1309
1310         mutex_unlock(&irq_ptr->setup_mutex);
1311         qdio_print_subchannel_info(irq_ptr, cdev);
1312         qdio_setup_debug_entries(irq_ptr, cdev);
1313         return 0;
1314 }
1315 EXPORT_SYMBOL_GPL(qdio_establish);
1316
1317 /**
1318  * qdio_activate - activate queues on a qdio subchannel
1319  * @cdev: associated cdev
1320  */
1321 int qdio_activate(struct ccw_device *cdev)
1322 {
1323         struct qdio_irq *irq_ptr;
1324         int rc;
1325         unsigned long saveflags;
1326
1327         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1328
1329         irq_ptr = cdev->private->qdio_data;
1330         if (!irq_ptr)
1331                 return -ENODEV;
1332
1333         if (cdev->private->state != DEV_STATE_ONLINE)
1334                 return -EINVAL;
1335
1336         mutex_lock(&irq_ptr->setup_mutex);
1337         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1338                 rc = -EBUSY;
1339                 goto out;
1340         }
1341
1342         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1343         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1344         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1345         irq_ptr->ccw.cda = 0;
1346
1347         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1348         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1349
1350         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1351                               0, DOIO_DENY_PREFETCH);
1352         if (rc) {
1353                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1354                 DBF_ERROR("rc:%4x", rc);
1355         }
1356         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1357
1358         if (rc)
1359                 goto out;
1360
1361         if (is_thinint_irq(irq_ptr))
1362                 tiqdio_add_input_queues(irq_ptr);
1363
1364         /* wait for subchannel to become active */
1365         msleep(5);
1366
1367         switch (irq_ptr->state) {
1368         case QDIO_IRQ_STATE_STOPPED:
1369         case QDIO_IRQ_STATE_ERR:
1370                 rc = -EIO;
1371                 break;
1372         default:
1373                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1374                 rc = 0;
1375         }
1376 out:
1377         mutex_unlock(&irq_ptr->setup_mutex);
1378         return rc;
1379 }
1380 EXPORT_SYMBOL_GPL(qdio_activate);
1381
1382 static inline int buf_in_between(int bufnr, int start, int count)
1383 {
1384         int end = add_buf(start, count);
1385
1386         if (end > start) {
1387                 if (bufnr >= start && bufnr < end)
1388                         return 1;
1389                 else
1390                         return 0;
1391         }
1392
1393         /* wrap-around case */
1394         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1395             (bufnr < end))
1396                 return 1;
1397         else
1398                 return 0;
1399 }
1400
1401 /**
1402  * handle_inbound - reset processed input buffers
1403  * @q: queue containing the buffers
1404  * @callflags: flags
1405  * @bufnr: first buffer to process
1406  * @count: how many buffers are emptied
1407  */
1408 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1409                           int bufnr, int count)
1410 {
1411         int used, diff;
1412
1413         qperf_inc(q, inbound_call);
1414
1415         if (!q->u.in.polling)
1416                 goto set;
1417
1418         /* protect against stop polling setting an ACK for an emptied slsb */
1419         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1420                 /* overwriting everything, just delete polling status */
1421                 q->u.in.polling = 0;
1422                 q->u.in.ack_count = 0;
1423                 goto set;
1424         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1425                 if (is_qebsm(q)) {
1426                         /* partial overwrite, just update ack_start */
1427                         diff = add_buf(bufnr, count);
1428                         diff = sub_buf(diff, q->u.in.ack_start);
1429                         q->u.in.ack_count -= diff;
1430                         if (q->u.in.ack_count <= 0) {
1431                                 q->u.in.polling = 0;
1432                                 q->u.in.ack_count = 0;
1433                                 goto set;
1434                         }
1435                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1436                 }
1437                 else
1438                         /* the only ACK will be deleted, so stop polling */
1439                         q->u.in.polling = 0;
1440         }
1441
1442 set:
1443         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1444
1445         used = atomic_add_return(count, &q->nr_buf_used) - count;
1446         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1447
1448         /* no need to signal as long as the adapter had free buffers */
1449         if (used)
1450                 return 0;
1451
1452         if (need_siga_in(q))
1453                 return qdio_siga_input(q);
1454         return 0;
1455 }
1456
1457 /**
1458  * handle_outbound - process filled outbound buffers
1459  * @q: queue containing the buffers
1460  * @callflags: flags
1461  * @bufnr: first buffer to process
1462  * @count: how many buffers are filled
1463  */
1464 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1465                            int bufnr, int count)
1466 {
1467         unsigned char state;
1468         int used, rc = 0;
1469
1470         qperf_inc(q, outbound_call);
1471
1472         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1473         used = atomic_add_return(count, &q->nr_buf_used);
1474         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1475
1476         if (callflags & QDIO_FLAG_PCI_OUT) {
1477                 q->u.out.pci_out_enabled = 1;
1478                 qperf_inc(q, pci_request_int);
1479         }
1480         else
1481                 q->u.out.pci_out_enabled = 0;
1482
1483         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1484                 if (multicast_outbound(q))
1485                         rc = qdio_kick_outbound_q(q);
1486                 else
1487                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1488                             (count > 1) &&
1489                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1490                                 /* exploit enhanced SIGA */
1491                                 q->u.out.use_enh_siga = 1;
1492                                 rc = qdio_kick_outbound_q(q);
1493                         } else {
1494                                 /*
1495                                 * One siga-w per buffer required for unicast
1496                                 * HiperSockets.
1497                                 */
1498                                 q->u.out.use_enh_siga = 0;
1499                                 while (count--) {
1500                                         rc = qdio_kick_outbound_q(q);
1501                                         if (rc)
1502                                                 goto out;
1503                                 }
1504                         }
1505                 goto out;
1506         }
1507
1508         if (need_siga_sync(q)) {
1509                 qdio_siga_sync_q(q);
1510                 goto out;
1511         }
1512
1513         /* try to fast requeue buffers */
1514         get_buf_state(q, prev_buf(bufnr), &state, 0);
1515         if (state != SLSB_CU_OUTPUT_PRIMED)
1516                 rc = qdio_kick_outbound_q(q);
1517         else
1518                 qperf_inc(q, fast_requeue);
1519
1520 out:
1521         tasklet_schedule(&q->tasklet);
1522         return rc;
1523 }
1524
1525 /**
1526  * do_QDIO - process input or output buffers
1527  * @cdev: associated ccw_device for the qdio subchannel
1528  * @callflags: input or output and special flags from the program
1529  * @q_nr: queue number
1530  * @bufnr: buffer number
1531  * @count: how many buffers to process
1532  */
1533 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1534             int q_nr, unsigned int bufnr, unsigned int count)
1535 {
1536         struct qdio_irq *irq_ptr;
1537
1538         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1539                 return -EINVAL;
1540
1541         irq_ptr = cdev->private->qdio_data;
1542         if (!irq_ptr)
1543                 return -ENODEV;
1544
1545         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1546                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1547
1548         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1549                 return -EBUSY;
1550
1551         if (callflags & QDIO_FLAG_SYNC_INPUT)
1552                 return handle_inbound(irq_ptr->input_qs[q_nr],
1553                                       callflags, bufnr, count);
1554         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1555                 return handle_outbound(irq_ptr->output_qs[q_nr],
1556                                        callflags, bufnr, count);
1557         return -EINVAL;
1558 }
1559 EXPORT_SYMBOL_GPL(do_QDIO);
1560
1561 static int __init init_QDIO(void)
1562 {
1563         int rc;
1564
1565         rc = qdio_setup_init();
1566         if (rc)
1567                 return rc;
1568         rc = tiqdio_allocate_memory();
1569         if (rc)
1570                 goto out_cache;
1571         rc = qdio_debug_init();
1572         if (rc)
1573                 goto out_ti;
1574         rc = tiqdio_register_thinints();
1575         if (rc)
1576                 goto out_debug;
1577         return 0;
1578
1579 out_debug:
1580         qdio_debug_exit();
1581 out_ti:
1582         tiqdio_free_memory();
1583 out_cache:
1584         qdio_setup_exit();
1585         return rc;
1586 }
1587
1588 static void __exit exit_QDIO(void)
1589 {
1590         tiqdio_unregister_thinints();
1591         tiqdio_free_memory();
1592         qdio_debug_exit();
1593         qdio_setup_exit();
1594 }
1595
1596 module_init(init_QDIO);
1597 module_exit(exit_QDIO);