drivers/s390/cio/qdio_main.c

   1 /*
   2  * linux/drivers/s390/cio/qdio_main.c
   3  *
   4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   5  *
   6  * Copyright 2000,2008 IBM Corp.
   7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   8  *            Jan Glauber <jang@linux.vnet.ibm.com>
   9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include <asm/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19
  20 #include "cio.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "qdio.h"
  24 #include "qdio_debug.h"
  25 #include "qdio_perf.h"
  26
  27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  28         "Jan Glauber <jang@linux.vnet.ibm.com>");
  29 MODULE_DESCRIPTION("QDIO base support");
  30 MODULE_LICENSE("GPL");
  31
  32 static inline int do_siga_sync(struct subchannel_id schid,
  33                                unsigned int out_mask, unsigned int in_mask)
  34 {
  35         register unsigned long __fc asm ("0") = 2;
  36         register struct subchannel_id __schid asm ("1") = schid;
  37         register unsigned long out asm ("2") = out_mask;
  38         register unsigned long in asm ("3") = in_mask;
  39         int cc;
  40
  41         asm volatile(
  42                 "       siga    0\n"
  43                 "       ipm     %0\n"
  44                 "       srl     %0,28\n"
  45                 : "=d" (cc)
  46                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  47         return cc;
  48 }
  49
  50 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
  51 {
  52         register unsigned long __fc asm ("0") = 1;
  53         register struct subchannel_id __schid asm ("1") = schid;
  54         register unsigned long __mask asm ("2") = mask;
  55         int cc;
  56
  57         asm volatile(
  58                 "       siga    0\n"
  59                 "       ipm     %0\n"
  60                 "       srl     %0,28\n"
  61                 : "=d" (cc)
  62                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  63         return cc;
  64 }
  65
  66 /**
  67  * do_siga_output - perform SIGA-w/wt function
  68  * @schid: subchannel id or in case of QEBSM the subchannel token
  69  * @mask: which output queues to process
  70  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  71  * @fc: function code to perform
  72  *
  73  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
  74  * Note: For IQDC unicast queues only the highest priority queue is processed.
  75  */
  76 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  77                                  unsigned int *bb, unsigned int fc)
  78 {
  79         register unsigned long __fc asm("0") = fc;
  80         register unsigned long __schid asm("1") = schid;
  81         register unsigned long __mask asm("2") = mask;
  82         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  83
  84         asm volatile(
  85                 "       siga    0\n"
  86                 "0:     ipm     %0\n"
  87                 "       srl     %0,28\n"
  88                 "1:\n"
  89                 EX_TABLE(0b, 1b)
  90                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
  91                 : : "cc", "memory");
  92         *bb = ((unsigned int) __fc) >> 31;
  93         return cc;
  94 }
  95
  96 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
  97 {
  98         /* all done or next buffer state different */
  99         if (ccq == 0 || ccq == 32)
 100                 return 0;
 101         /* not all buffers processed */
 102         if (ccq == 96 || ccq == 97)
 103                 return 1;
 104         /* notify devices immediately */
 105         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 106         return -EIO;
 107 }
 108
 109 /**
 110  * qdio_do_eqbs - extract buffer states for QEBSM
 111  * @q: queue to manipulate
 112  * @state: state of the extracted buffers
 113  * @start: buffer number to start at
 114  * @count: count of buffers to examine
 115  * @auto_ack: automatically acknowledge buffers
 116  *
 117  * Returns the number of successfully extracted equal buffer states.
 118  * Stops processing if a state is different from the last buffers state.
 119  */
 120 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 121                         int start, int count, int auto_ack)
 122 {
 123         unsigned int ccq = 0;
 124         int tmp_count = count, tmp_start = start;
 125         int nr = q->nr;
 126         int rc;
 127
 128         BUG_ON(!q->irq_ptr->sch_token);
 129         qdio_perf_stat_inc(&perf_stats.debug_eqbs_all);
 130
 131         if (!q->is_input_q)
 132                 nr += q->irq_ptr->nr_input_qs;
 133 again:
 134         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 135                       auto_ack);
 136         rc = qdio_check_ccq(q, ccq);
 137
 138         /* At least one buffer was processed, return and extract the remaining
 139          * buffers later.
 140          */
 141         if ((ccq == 96) && (count != tmp_count)) {
 142                 qdio_perf_stat_inc(&perf_stats.debug_eqbs_incomplete);
 143                 return (count - tmp_count);
 144         }
 145
 146         if (rc == 1) {
 147                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 148                 goto again;
 149         }
 150
 151         if (rc < 0) {
 152                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 153                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 154                 q->handler(q->irq_ptr->cdev,
 155                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 156                            0, -1, -1, q->irq_ptr->int_parm);
 157                 return 0;
 158         }
 159         return count - tmp_count;
 160 }
 161
 162 /**
 163  * qdio_do_sqbs - set buffer states for QEBSM
 164  * @q: queue to manipulate
 165  * @state: new state of the buffers
 166  * @start: first buffer number to change
 167  * @count: how many buffers to change
 168  *
 169  * Returns the number of successfully changed buffers.
 170  * Does retrying until the specified count of buffer states is set or an
 171  * error occurs.
 172  */
 173 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 174                         int count)
 175 {
 176         unsigned int ccq = 0;
 177         int tmp_count = count, tmp_start = start;
 178         int nr = q->nr;
 179         int rc;
 180
 181         if (!count)
 182                 return 0;
 183
 184         BUG_ON(!q->irq_ptr->sch_token);
 185         qdio_perf_stat_inc(&perf_stats.debug_sqbs_all);
 186
 187         if (!q->is_input_q)
 188                 nr += q->irq_ptr->nr_input_qs;
 189 again:
 190         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 191         rc = qdio_check_ccq(q, ccq);
 192         if (rc == 1) {
 193                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 194                 qdio_perf_stat_inc(&perf_stats.debug_sqbs_incomplete);
 195                 goto again;
 196         }
 197         if (rc < 0) {
 198                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 199                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 200                 q->handler(q->irq_ptr->cdev,
 201                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 202                            0, -1, -1, q->irq_ptr->int_parm);
 203                 return 0;
 204         }
 205         WARN_ON(tmp_count);
 206         return count - tmp_count;
 207 }
 208
 209 /* returns number of examined buffers and their common state in *state */
 210 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 211                                  unsigned char *state, unsigned int count,
 212                                  int auto_ack)
 213 {
 214         unsigned char __state = 0;
 215         int i;
 216
 217         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 218         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 219
 220         if (is_qebsm(q))
 221                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 222
 223         for (i = 0; i < count; i++) {
 224                 if (!__state)
 225                         __state = q->slsb.val[bufnr];
 226                 else if (q->slsb.val[bufnr] != __state)
 227                         break;
 228                 bufnr = next_buf(bufnr);
 229         }
 230         *state = __state;
 231         return i;
 232 }
 233
 234 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 int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 280                           unsigned int input)
 281 {
 282         int cc;
 283
 284         if (!need_siga_sync(q))
 285                 return 0;
 286
 287         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 288         qdio_perf_stat_inc(&perf_stats.siga_sync);
 289
 290         cc = do_siga_sync(q->irq_ptr->schid, output, input);
 291         if (cc)
 292                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 293         return cc;
 294 }
 295
 296 inline int qdio_siga_sync_q(struct qdio_q *q)
 297 {
 298         if (q->is_input_q)
 299                 return qdio_siga_sync(q, 0, q->mask);
 300         else
 301                 return qdio_siga_sync(q, q->mask, 0);
 302 }
 303
 304 static inline int qdio_siga_sync_out(struct qdio_q *q)
 305 {
 306         return qdio_siga_sync(q, ~0U, 0);
 307 }
 308
 309 static inline int qdio_siga_sync_all(struct qdio_q *q)
 310 {
 311         return qdio_siga_sync(q, ~0U, ~0U);
 312 }
 313
 314 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 315 {
 316         unsigned long schid;
 317         unsigned int fc = 0;
 318         u64 start_time = 0;
 319         int cc;
 320
 321         if (q->u.out.use_enh_siga)
 322                 fc = 3;
 323
 324         if (is_qebsm(q)) {
 325                 schid = q->irq_ptr->sch_token;
 326                 fc |= 0x80;
 327         }
 328         else
 329                 schid = *((u32 *)&q->irq_ptr->schid);
 330
 331 again:
 332         cc = do_siga_output(schid, q->mask, busy_bit, fc);
 333
 334         /* hipersocket busy condition */
 335         if (*busy_bit) {
 336                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 337
 338                 if (!start_time) {
 339                         start_time = get_usecs();
 340                         goto again;
 341                 }
 342                 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 343                         goto again;
 344         }
 345         return cc;
 346 }
 347
 348 static inline int qdio_siga_input(struct qdio_q *q)
 349 {
 350         int cc;
 351
 352         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 353         qdio_perf_stat_inc(&perf_stats.siga_in);
 354
 355         cc = do_siga_input(q->irq_ptr->schid, q->mask);
 356         if (cc)
 357                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 358         return cc;
 359 }
 360
 361 /* called from thinint inbound handler */
 362 void qdio_sync_after_thinint(struct qdio_q *q)
 363 {
 364         if (pci_out_supported(q)) {
 365                 if (need_siga_sync_thinint(q))
 366                         qdio_siga_sync_all(q);
 367                 else if (need_siga_sync_out_thinint(q))
 368                         qdio_siga_sync_out(q);
 369         } else
 370                 qdio_siga_sync_q(q);
 371 }
 372
 373 inline void qdio_stop_polling(struct qdio_q *q)
 374 {
 375         if (!q->u.in.polling)
 376                 return;
 377
 378         q->u.in.polling = 0;
 379         qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
 380
 381         /* show the card that we are not polling anymore */
 382         if (is_qebsm(q)) {
 383                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 384                                q->u.in.ack_count);
 385                 q->u.in.ack_count = 0;
 386         } else
 387                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 388 }
 389
 390 static void announce_buffer_error(struct qdio_q *q, int count)
 391 {
 392         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 393
 394         /* special handling for no target buffer empty */
 395         if ((!q->is_input_q &&
 396             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 397                 qdio_perf_stat_inc(&perf_stats.outbound_target_full);
 398                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d",
 399                               q->first_to_check);
 400                 return;
 401         }
 402
 403         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 404         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 405         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 406         DBF_ERROR("F14:%2x F15:%2x",
 407                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 408                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 409 }
 410
 411 static inline void inbound_primed(struct qdio_q *q, int count)
 412 {
 413         int new;
 414
 415         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count);
 416
 417         /* for QEBSM the ACK was already set by EQBS */
 418         if (is_qebsm(q)) {
 419                 if (!q->u.in.polling) {
 420                         q->u.in.polling = 1;
 421                         q->u.in.ack_count = count;
 422                         q->u.in.ack_start = q->first_to_check;
 423                         return;
 424                 }
 425
 426                 /* delete the previous ACK's */
 427                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 428                                q->u.in.ack_count);
 429                 q->u.in.ack_count = count;
 430                 q->u.in.ack_start = q->first_to_check;
 431                 return;
 432         }
 433
 434         /*
 435          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 436          * or by the next inbound run.
 437          */
 438         new = add_buf(q->first_to_check, count - 1);
 439         if (q->u.in.polling) {
 440                 /* reset the previous ACK but first set the new one */
 441                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 442                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 443         } else {
 444                 q->u.in.polling = 1;
 445                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 446         }
 447
 448         q->u.in.ack_start = new;
 449         count--;
 450         if (!count)
 451                 return;
 452
 453         /*
 454          * Need to change all PRIMED buffers to NOT_INIT, otherwise
 455          * we're loosing initiative in the thinint code.
 456          */
 457         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT,
 458                        count);
 459 }
 460
 461 static int get_inbound_buffer_frontier(struct qdio_q *q)
 462 {
 463         int count, stop;
 464         unsigned char state;
 465
 466         /*
 467          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 468          * would return 0.
 469          */
 470         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 471         stop = add_buf(q->first_to_check, count);
 472
 473         /*
 474          * No siga sync here, as a PCI or we after a thin interrupt
 475          * will sync the queues.
 476          */
 477
 478         /* need to set count to 1 for non-qebsm */
 479         if (!is_qebsm(q))
 480                 count = 1;
 481
 482 check_next:
 483         if (q->first_to_check == stop)
 484                 goto out;
 485
 486         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 487         if (!count)
 488                 goto out;
 489
 490         switch (state) {
 491         case SLSB_P_INPUT_PRIMED:
 492                 inbound_primed(q, count);
 493                 /*
 494                  * No siga-sync needed for non-qebsm here, as the inbound queue
 495                  * will be synced on the next siga-r, resp.
 496                  * tiqdio_is_inbound_q_done will do the siga-sync.
 497                  */
 498                 q->first_to_check = add_buf(q->first_to_check, count);
 499                 atomic_sub(count, &q->nr_buf_used);
 500                 goto check_next;
 501         case SLSB_P_INPUT_ERROR:
 502                 announce_buffer_error(q, count);
 503                 /* process the buffer, the upper layer will take care of it */
 504                 q->first_to_check = add_buf(q->first_to_check, count);
 505                 atomic_sub(count, &q->nr_buf_used);
 506                 break;
 507         case SLSB_CU_INPUT_EMPTY:
 508         case SLSB_P_INPUT_NOT_INIT:
 509         case SLSB_P_INPUT_ACK:
 510                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 511                 break;
 512         default:
 513                 BUG();
 514         }
 515 out:
 516         return q->first_to_check;
 517 }
 518
 519 int qdio_inbound_q_moved(struct qdio_q *q)
 520 {
 521         int bufnr;
 522
 523         bufnr = get_inbound_buffer_frontier(q);
 524
 525         if ((bufnr != q->last_move) || q->qdio_error) {
 526                 q->last_move = bufnr;
 527                 if (!need_siga_sync(q) && !pci_out_supported(q))
 528                         q->u.in.timestamp = get_usecs();
 529
 530                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in moved");
 531                 return 1;
 532         } else
 533                 return 0;
 534 }
 535
 536 static int qdio_inbound_q_done(struct qdio_q *q)
 537 {
 538         unsigned char state = 0;
 539
 540         if (!atomic_read(&q->nr_buf_used))
 541                 return 1;
 542
 543         /*
 544          * We need that one for synchronization with the adapter, as it
 545          * does a kind of PCI avoidance.
 546          */
 547         qdio_siga_sync_q(q);
 548
 549         get_buf_state(q, q->first_to_check, &state, 0);
 550         if (state == SLSB_P_INPUT_PRIMED)
 551                 /* we got something to do */
 552                 return 0;
 553
 554         /* on VM, we don't poll, so the q is always done here */
 555         if (need_siga_sync(q) || pci_out_supported(q))
 556                 return 1;
 557
 558         /*
 559          * At this point we know, that inbound first_to_check
 560          * has (probably) not moved (see qdio_inbound_processing).
 561          */
 562         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 563                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d",
 564                               q->first_to_check);
 565                 return 1;
 566         } else {
 567                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in notd:%3d",
 568                               q->first_to_check);
 569                 return 0;
 570         }
 571 }
 572
 573 void qdio_kick_inbound_handler(struct qdio_q *q)
 574 {
 575         int count, start, end;
 576
 577         qdio_perf_stat_inc(&perf_stats.inbound_handler);
 578
 579         start = q->first_to_kick;
 580         end = q->first_to_check;
 581         if (end >= start)
 582                 count = end - start;
 583         else
 584                 count = end + QDIO_MAX_BUFFERS_PER_Q - start;
 585
 586         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count);
 587
 588         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 589                 return;
 590
 591         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr,
 592                    start, count, q->irq_ptr->int_parm);
 593
 594         /* for the next time */
 595         q->first_to_kick = q->first_to_check;
 596         q->qdio_error = 0;
 597 }
 598
 599 static void __qdio_inbound_processing(struct qdio_q *q)
 600 {
 601         qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
 602 again:
 603         if (!qdio_inbound_q_moved(q))
 604                 return;
 605
 606         qdio_kick_inbound_handler(q);
 607
 608         if (!qdio_inbound_q_done(q))
 609                 /* means poll time is not yet over */
 610                 goto again;
 611
 612         qdio_stop_polling(q);
 613         /*
 614          * We need to check again to not lose initiative after
 615          * resetting the ACK state.
 616          */
 617         if (!qdio_inbound_q_done(q))
 618                 goto again;
 619 }
 620
 621 /* inbound tasklet */
 622 void qdio_inbound_processing(unsigned long data)
 623 {
 624         struct qdio_q *q = (struct qdio_q *)data;
 625         __qdio_inbound_processing(q);
 626 }
 627
 628 static int get_outbound_buffer_frontier(struct qdio_q *q)
 629 {
 630         int count, stop;
 631         unsigned char state;
 632
 633         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 634             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 635                 qdio_siga_sync_q(q);
 636
 637         /*
 638          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 639          * would return 0.
 640          */
 641         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 642         stop = add_buf(q->first_to_check, count);
 643
 644         /* need to set count to 1 for non-qebsm */
 645         if (!is_qebsm(q))
 646                 count = 1;
 647
 648 check_next:
 649         if (q->first_to_check == stop)
 650                 return q->first_to_check;
 651
 652         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 653         if (!count)
 654                 return q->first_to_check;
 655
 656         switch (state) {
 657         case SLSB_P_OUTPUT_EMPTY:
 658                 /* the adapter got it */
 659                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count);
 660
 661                 atomic_sub(count, &q->nr_buf_used);
 662                 q->first_to_check = add_buf(q->first_to_check, count);
 663                 /*
 664                  * We fetch all buffer states at once. get_buf_states may
 665                  * return count < stop. For QEBSM we do not loop.
 666                  */
 667                 if (is_qebsm(q))
 668                         break;
 669                 goto check_next;
 670         case SLSB_P_OUTPUT_ERROR:
 671                 announce_buffer_error(q, count);
 672                 /* process the buffer, the upper layer will take care of it */
 673                 q->first_to_check = add_buf(q->first_to_check, count);
 674                 atomic_sub(count, &q->nr_buf_used);
 675                 break;
 676         case SLSB_CU_OUTPUT_PRIMED:
 677                 /* the adapter has not fetched the output yet */
 678                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 679                 break;
 680         case SLSB_P_OUTPUT_NOT_INIT:
 681         case SLSB_P_OUTPUT_HALTED:
 682                 break;
 683         default:
 684                 BUG();
 685         }
 686         return q->first_to_check;
 687 }
 688
 689 /* all buffers processed? */
 690 static inline int qdio_outbound_q_done(struct qdio_q *q)
 691 {
 692         return atomic_read(&q->nr_buf_used) == 0;
 693 }
 694
 695 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 696 {
 697         int bufnr;
 698
 699         bufnr = get_outbound_buffer_frontier(q);
 700
 701         if ((bufnr != q->last_move) || q->qdio_error) {
 702                 q->last_move = bufnr;
 703                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 704                 return 1;
 705         } else
 706                 return 0;
 707 }
 708
 709 static void qdio_kick_outbound_q(struct qdio_q *q)
 710 {
 711         unsigned int busy_bit;
 712         int cc;
 713
 714         if (!need_siga_out(q))
 715                 return;
 716
 717         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 718         qdio_perf_stat_inc(&perf_stats.siga_out);
 719
 720         cc = qdio_siga_output(q, &busy_bit);
 721         switch (cc) {
 722         case 0:
 723                 break;
 724         case 2:
 725                 if (busy_bit) {
 726                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 727                         q->qdio_error = cc | QDIO_ERROR_SIGA_BUSY;
 728                 } else {
 729                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d",
 730                                       q->nr);
 731                         q->qdio_error = cc;
 732                 }
 733                 break;
 734         case 1:
 735         case 3:
 736                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 737                 q->qdio_error = cc;
 738                 break;
 739         }
 740 }
 741
 742 static void qdio_kick_outbound_handler(struct qdio_q *q)
 743 {
 744         int start, end, count;
 745
 746         start = q->first_to_kick;
 747         end = q->last_move;
 748         if (end >= start)
 749                 count = end - start;
 750         else
 751                 count = end + QDIO_MAX_BUFFERS_PER_Q - start;
 752
 753         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kickouth: %1d", q->nr);
 754         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count);
 755
 756         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 757                 return;
 758
 759         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 760                    q->irq_ptr->int_parm);
 761
 762         /* for the next time: */
 763         q->first_to_kick = q->last_move;
 764         q->qdio_error = 0;
 765 }
 766
 767 static void __qdio_outbound_processing(struct qdio_q *q)
 768 {
 769         unsigned long flags;
 770
 771         qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
 772         spin_lock_irqsave(&q->lock, flags);
 773
 774         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 775
 776         if (qdio_outbound_q_moved(q))
 777                 qdio_kick_outbound_handler(q);
 778
 779         spin_unlock_irqrestore(&q->lock, flags);
 780
 781         if (queue_type(q) == QDIO_ZFCP_QFMT)
 782                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 783                         goto sched;
 784
 785         /* bail out for HiperSockets unicast queues */
 786         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 787                 return;
 788
 789         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 790             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 791                 goto sched;
 792
 793         if (q->u.out.pci_out_enabled)
 794                 return;
 795
 796         /*
 797          * Now we know that queue type is either qeth without pci enabled
 798          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 799          * EMPTY is noticed and outbound_handler is called after some time.
 800          */
 801         if (qdio_outbound_q_done(q))
 802                 del_timer(&q->u.out.timer);
 803         else {
 804                 if (!timer_pending(&q->u.out.timer)) {
 805                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 806                         qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
 807                 }
 808         }
 809         return;
 810
 811 sched:
 812         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 813                 return;
 814         tasklet_schedule(&q->tasklet);
 815 }
 816
 817 /* outbound tasklet */
 818 void qdio_outbound_processing(unsigned long data)
 819 {
 820         struct qdio_q *q = (struct qdio_q *)data;
 821         __qdio_outbound_processing(q);
 822 }
 823
 824 void qdio_outbound_timer(unsigned long data)
 825 {
 826         struct qdio_q *q = (struct qdio_q *)data;
 827
 828         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 829                 return;
 830         tasklet_schedule(&q->tasklet);
 831 }
 832
 833 /* called from thinint inbound tasklet */
 834 void qdio_check_outbound_after_thinint(struct qdio_q *q)
 835 {
 836         struct qdio_q *out;
 837         int i;
 838
 839         if (!pci_out_supported(q))
 840                 return;
 841
 842         for_each_output_queue(q->irq_ptr, out, i)
 843                 if (!qdio_outbound_q_done(out))
 844                         tasklet_schedule(&out->tasklet);
 845 }
 846
 847 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 848                                   enum qdio_irq_states state)
 849 {
 850         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 851
 852         irq_ptr->state = state;
 853         mb();
 854 }
 855
 856 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 857 {
 858         if (irb->esw.esw0.erw.cons) {
 859                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 860                 DBF_ERROR_HEX(irb, 64);
 861                 DBF_ERROR_HEX(irb->ecw, 64);
 862         }
 863 }
 864
 865 /* PCI interrupt handler */
 866 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 867 {
 868         int i;
 869         struct qdio_q *q;
 870
 871         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 872                 return;
 873
 874         qdio_perf_stat_inc(&perf_stats.pci_int);
 875
 876         for_each_input_queue(irq_ptr, q, i)
 877                 tasklet_schedule(&q->tasklet);
 878
 879         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 880                 return;
 881
 882         for_each_output_queue(irq_ptr, q, i) {
 883                 if (qdio_outbound_q_done(q))
 884                         continue;
 885
 886                 if (!siga_syncs_out_pci(q))
 887                         qdio_siga_sync_q(q);
 888
 889                 tasklet_schedule(&q->tasklet);
 890         }
 891 }
 892
 893 static void qdio_handle_activate_check(struct ccw_device *cdev,
 894                                 unsigned long intparm, int cstat, int dstat)
 895 {
 896         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 897         struct qdio_q *q;
 898
 899         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 900         DBF_ERROR("intp :%lx", intparm);
 901         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 902
 903         if (irq_ptr->nr_input_qs) {
 904                 q = irq_ptr->input_qs[0];
 905         } else if (irq_ptr->nr_output_qs) {
 906                 q = irq_ptr->output_qs[0];
 907         } else {
 908                 dump_stack();
 909                 goto no_handler;
 910         }
 911         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 912                    0, -1, -1, irq_ptr->int_parm);
 913 no_handler:
 914         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 915 }
 916
 917 static void qdio_call_shutdown(struct work_struct *work)
 918 {
 919         struct ccw_device_private *priv;
 920         struct ccw_device *cdev;
 921
 922         priv = container_of(work, struct ccw_device_private, kick_work);
 923         cdev = priv->cdev;
 924         qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
 925         put_device(&cdev->dev);
 926 }
 927
 928 static void qdio_int_error(struct ccw_device *cdev)
 929 {
 930         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 931
 932         switch (irq_ptr->state) {
 933         case QDIO_IRQ_STATE_INACTIVE:
 934         case QDIO_IRQ_STATE_CLEANUP:
 935                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 936                 break;
 937         case QDIO_IRQ_STATE_ESTABLISHED:
 938         case QDIO_IRQ_STATE_ACTIVE:
 939                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 940                 if (get_device(&cdev->dev)) {
 941                         /* Can't call shutdown from interrupt context. */
 942                         PREPARE_WORK(&cdev->private->kick_work,
 943                                      qdio_call_shutdown);
 944                         queue_work(ccw_device_work, &cdev->private->kick_work);
 945                 }
 946                 break;
 947         default:
 948                 WARN_ON(1);
 949         }
 950         wake_up(&cdev->private->wait_q);
 951 }
 952
 953 static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat,
 954                                        int dstat)
 955 {
 956         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 957
 958         if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
 959                 DBF_ERROR("EQ:ck con");
 960                 goto error;
 961         }
 962
 963         if (!(dstat & DEV_STAT_DEV_END)) {
 964                 DBF_ERROR("EQ:no dev");
 965                 goto error;
 966         }
 967
 968         if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) {
 969                 DBF_ERROR("EQ: bad io");
 970                 goto error;
 971         }
 972         return 0;
 973 error:
 974         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 975         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 976
 977         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 978         return 1;
 979 }
 980
 981 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 982                                       int dstat)
 983 {
 984         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 985
 986         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 987         if (!qdio_establish_check_errors(cdev, cstat, dstat))
 988                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 989 }
 990
 991 /* qdio interrupt handler */
 992 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 993                       struct irb *irb)
 994 {
 995         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 996         int cstat, dstat;
 997
 998         qdio_perf_stat_inc(&perf_stats.qdio_int);
 999
1000         if (!intparm || !irq_ptr) {
1001                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1002                 return;
1003         }
1004
1005         if (IS_ERR(irb)) {
1006                 switch (PTR_ERR(irb)) {
1007                 case -EIO:
1008                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1009                         return;
1010                 case -ETIMEDOUT:
1011                         DBF_ERROR("%4x IO timeout", irq_ptr->schid.sch_no);
1012                         qdio_int_error(cdev);
1013                         return;
1014                 default:
1015                         WARN_ON(1);
1016                         return;
1017                 }
1018         }
1019         qdio_irq_check_sense(irq_ptr, irb);
1020
1021         cstat = irb->scsw.cmd.cstat;
1022         dstat = irb->scsw.cmd.dstat;
1023
1024         switch (irq_ptr->state) {
1025         case QDIO_IRQ_STATE_INACTIVE:
1026                 qdio_establish_handle_irq(cdev, cstat, dstat);
1027                 break;
1028
1029         case QDIO_IRQ_STATE_CLEANUP:
1030                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1031                 break;
1032
1033         case QDIO_IRQ_STATE_ESTABLISHED:
1034         case QDIO_IRQ_STATE_ACTIVE:
1035                 if (cstat & SCHN_STAT_PCI) {
1036                         qdio_int_handler_pci(irq_ptr);
1037                         /* no state change so no need to wake up wait_q */
1038                         return;
1039                 }
1040                 if ((cstat & ~SCHN_STAT_PCI) || dstat) {
1041                         qdio_handle_activate_check(cdev, intparm, cstat,
1042                                                    dstat);
1043                         break;
1044                 }
1045         default:
1046                 WARN_ON(1);
1047         }
1048         wake_up(&cdev->private->wait_q);
1049 }
1050
1051 /**
1052  * qdio_get_ssqd_desc - get qdio subchannel description
1053  * @cdev: ccw device to get description for
1054  * @data: where to store the ssqd
1055  *
1056  * Returns 0 or an error code. The results of the chsc are stored in the
1057  * specified structure.
1058  */
1059 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1060                        struct qdio_ssqd_desc *data)
1061 {
1062
1063         if (!cdev || !cdev->private)
1064                 return -EINVAL;
1065
1066         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1067         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1068 }
1069 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1070
1071 /**
1072  * qdio_cleanup - shutdown queues and free data structures
1073  * @cdev: associated ccw device
1074  * @how: use halt or clear to shutdown
1075  *
1076  * This function calls qdio_shutdown() for @cdev with method @how.
1077  * and qdio_free(). The qdio_free() return value is ignored since
1078  * !irq_ptr is already checked.
1079  */
1080 int qdio_cleanup(struct ccw_device *cdev, int how)
1081 {
1082         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1083         int rc;
1084
1085         if (!irq_ptr)
1086                 return -ENODEV;
1087
1088         rc = qdio_shutdown(cdev, how);
1089
1090         qdio_free(cdev);
1091         return rc;
1092 }
1093 EXPORT_SYMBOL_GPL(qdio_cleanup);
1094
1095 static void qdio_shutdown_queues(struct ccw_device *cdev)
1096 {
1097         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1098         struct qdio_q *q;
1099         int i;
1100
1101         for_each_input_queue(irq_ptr, q, i)
1102                 tasklet_kill(&q->tasklet);
1103
1104         for_each_output_queue(irq_ptr, q, i) {
1105                 del_timer(&q->u.out.timer);
1106                 tasklet_kill(&q->tasklet);
1107         }
1108 }
1109
1110 /**
1111  * qdio_shutdown - shut down a qdio subchannel
1112  * @cdev: associated ccw device
1113  * @how: use halt or clear to shutdown
1114  */
1115 int qdio_shutdown(struct ccw_device *cdev, int how)
1116 {
1117         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1118         int rc;
1119         unsigned long flags;
1120
1121         if (!irq_ptr)
1122                 return -ENODEV;
1123
1124         BUG_ON(irqs_disabled());
1125         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1126
1127         mutex_lock(&irq_ptr->setup_mutex);
1128         /*
1129          * Subchannel was already shot down. We cannot prevent being called
1130          * twice since cio may trigger a shutdown asynchronously.
1131          */
1132         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1133                 mutex_unlock(&irq_ptr->setup_mutex);
1134                 return 0;
1135         }
1136
1137         /*
1138          * Indicate that the device is going down. Scheduling the queue
1139          * tasklets is forbidden from here on.
1140          */
1141         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1142
1143         tiqdio_remove_input_queues(irq_ptr);
1144         qdio_shutdown_queues(cdev);
1145         qdio_shutdown_debug_entries(irq_ptr, cdev);
1146
1147         /* cleanup subchannel */
1148         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1149
1150         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1151                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1152         else
1153                 /* default behaviour is halt */
1154                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1155         if (rc) {
1156                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1157                 DBF_ERROR("rc:%4d", rc);
1158                 goto no_cleanup;
1159         }
1160
1161         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1162         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1163         wait_event_interruptible_timeout(cdev->private->wait_q,
1164                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1165                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1166                 10 * HZ);
1167         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1168
1169 no_cleanup:
1170         qdio_shutdown_thinint(irq_ptr);
1171
1172         /* restore interrupt handler */
1173         if ((void *)cdev->handler == (void *)qdio_int_handler)
1174                 cdev->handler = irq_ptr->orig_handler;
1175         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1176
1177         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1178         mutex_unlock(&irq_ptr->setup_mutex);
1179         if (rc)
1180                 return rc;
1181         return 0;
1182 }
1183 EXPORT_SYMBOL_GPL(qdio_shutdown);
1184
1185 /**
1186  * qdio_free - free data structures for a qdio subchannel
1187  * @cdev: associated ccw device
1188  */
1189 int qdio_free(struct ccw_device *cdev)
1190 {
1191         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1192
1193         if (!irq_ptr)
1194                 return -ENODEV;
1195
1196         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1197         mutex_lock(&irq_ptr->setup_mutex);
1198
1199         if (irq_ptr->debug_area != NULL) {
1200                 debug_unregister(irq_ptr->debug_area);
1201                 irq_ptr->debug_area = NULL;
1202         }
1203         cdev->private->qdio_data = NULL;
1204         mutex_unlock(&irq_ptr->setup_mutex);
1205
1206         qdio_release_memory(irq_ptr);
1207         return 0;
1208 }
1209 EXPORT_SYMBOL_GPL(qdio_free);
1210
1211 /**
1212  * qdio_initialize - allocate and establish queues for a qdio subchannel
1213  * @init_data: initialization data
1214  *
1215  * This function first allocates queues via qdio_allocate() and on success
1216  * establishes them via qdio_establish().
1217  */
1218 int qdio_initialize(struct qdio_initialize *init_data)
1219 {
1220         int rc;
1221
1222         rc = qdio_allocate(init_data);
1223         if (rc)
1224                 return rc;
1225
1226         rc = qdio_establish(init_data);
1227         if (rc)
1228                 qdio_free(init_data->cdev);
1229         return rc;
1230 }
1231 EXPORT_SYMBOL_GPL(qdio_initialize);
1232
1233 /**
1234  * qdio_allocate - allocate qdio queues and associated data
1235  * @init_data: initialization data
1236  */
1237 int qdio_allocate(struct qdio_initialize *init_data)
1238 {
1239         struct qdio_irq *irq_ptr;
1240
1241         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1242
1243         if ((init_data->no_input_qs && !init_data->input_handler) ||
1244             (init_data->no_output_qs && !init_data->output_handler))
1245                 return -EINVAL;
1246
1247         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1248             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1249                 return -EINVAL;
1250
1251         if ((!init_data->input_sbal_addr_array) ||
1252             (!init_data->output_sbal_addr_array))
1253                 return -EINVAL;
1254
1255         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1256         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1257         if (!irq_ptr)
1258                 goto out_err;
1259
1260         mutex_init(&irq_ptr->setup_mutex);
1261         qdio_allocate_dbf(init_data, irq_ptr);
1262
1263         /*
1264          * Allocate a page for the chsc calls in qdio_establish.
1265          * Must be pre-allocated since a zfcp recovery will call
1266          * qdio_establish. In case of low memory and swap on a zfcp disk
1267          * we may not be able to allocate memory otherwise.
1268          */
1269         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1270         if (!irq_ptr->chsc_page)
1271                 goto out_rel;
1272
1273         /* qdr is used in ccw1.cda which is u32 */
1274         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1275         if (!irq_ptr->qdr)
1276                 goto out_rel;
1277         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1278
1279         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1280                              init_data->no_output_qs))
1281                 goto out_rel;
1282
1283         init_data->cdev->private->qdio_data = irq_ptr;
1284         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1285         return 0;
1286 out_rel:
1287         qdio_release_memory(irq_ptr);
1288 out_err:
1289         return -ENOMEM;
1290 }
1291 EXPORT_SYMBOL_GPL(qdio_allocate);
1292
1293 /**
1294  * qdio_establish - establish queues on a qdio subchannel
1295  * @init_data: initialization data
1296  */
1297 int qdio_establish(struct qdio_initialize *init_data)
1298 {
1299         struct qdio_irq *irq_ptr;
1300         struct ccw_device *cdev = init_data->cdev;
1301         unsigned long saveflags;
1302         int rc;
1303
1304         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1305
1306         irq_ptr = cdev->private->qdio_data;
1307         if (!irq_ptr)
1308                 return -ENODEV;
1309
1310         if (cdev->private->state != DEV_STATE_ONLINE)
1311                 return -EINVAL;
1312
1313         mutex_lock(&irq_ptr->setup_mutex);
1314         qdio_setup_irq(init_data);
1315
1316         rc = qdio_establish_thinint(irq_ptr);
1317         if (rc) {
1318                 mutex_unlock(&irq_ptr->setup_mutex);
1319                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1320                 return rc;
1321         }
1322
1323         /* establish q */
1324         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1325         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1326         irq_ptr->ccw.count = irq_ptr->equeue.count;
1327         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1328
1329         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1330         ccw_device_set_options_mask(cdev, 0);
1331
1332         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1333         if (rc) {
1334                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1335                 DBF_ERROR("rc:%4x", rc);
1336         }
1337         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1338
1339         if (rc) {
1340                 mutex_unlock(&irq_ptr->setup_mutex);
1341                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1342                 return rc;
1343         }
1344
1345         wait_event_interruptible_timeout(cdev->private->wait_q,
1346                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1347                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1348
1349         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1350                 mutex_unlock(&irq_ptr->setup_mutex);
1351                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1352                 return -EIO;
1353         }
1354
1355         qdio_setup_ssqd_info(irq_ptr);
1356         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1357         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1358
1359         /* qebsm is now setup if available, initialize buffer states */
1360         qdio_init_buf_states(irq_ptr);
1361
1362         mutex_unlock(&irq_ptr->setup_mutex);
1363         qdio_print_subchannel_info(irq_ptr, cdev);
1364         qdio_setup_debug_entries(irq_ptr, cdev);
1365         return 0;
1366 }
1367 EXPORT_SYMBOL_GPL(qdio_establish);
1368
1369 /**
1370  * qdio_activate - activate queues on a qdio subchannel
1371  * @cdev: associated cdev
1372  */
1373 int qdio_activate(struct ccw_device *cdev)
1374 {
1375         struct qdio_irq *irq_ptr;
1376         int rc;
1377         unsigned long saveflags;
1378
1379         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1380
1381         irq_ptr = cdev->private->qdio_data;
1382         if (!irq_ptr)
1383                 return -ENODEV;
1384
1385         if (cdev->private->state != DEV_STATE_ONLINE)
1386                 return -EINVAL;
1387
1388         mutex_lock(&irq_ptr->setup_mutex);
1389         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1390                 rc = -EBUSY;
1391                 goto out;
1392         }
1393
1394         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1395         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1396         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1397         irq_ptr->ccw.cda = 0;
1398
1399         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1400         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1401
1402         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1403                               0, DOIO_DENY_PREFETCH);
1404         if (rc) {
1405                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1406                 DBF_ERROR("rc:%4x", rc);
1407         }
1408         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1409
1410         if (rc)
1411                 goto out;
1412
1413         if (is_thinint_irq(irq_ptr))
1414                 tiqdio_add_input_queues(irq_ptr);
1415
1416         /* wait for subchannel to become active */
1417         msleep(5);
1418
1419         switch (irq_ptr->state) {
1420         case QDIO_IRQ_STATE_STOPPED:
1421         case QDIO_IRQ_STATE_ERR:
1422                 rc = -EIO;
1423                 break;
1424         default:
1425                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1426                 rc = 0;
1427         }
1428 out:
1429         mutex_unlock(&irq_ptr->setup_mutex);
1430         return rc;
1431 }
1432 EXPORT_SYMBOL_GPL(qdio_activate);
1433
1434 static inline int buf_in_between(int bufnr, int start, int count)
1435 {
1436         int end = add_buf(start, count);
1437
1438         if (end > start) {
1439                 if (bufnr >= start && bufnr < end)
1440                         return 1;
1441                 else
1442                         return 0;
1443         }
1444
1445         /* wrap-around case */
1446         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1447             (bufnr < end))
1448                 return 1;
1449         else
1450                 return 0;
1451 }
1452
1453 /**
1454  * handle_inbound - reset processed input buffers
1455  * @q: queue containing the buffers
1456  * @callflags: flags
1457  * @bufnr: first buffer to process
1458  * @count: how many buffers are emptied
1459  */
1460 static void handle_inbound(struct qdio_q *q, unsigned int callflags,
1461                            int bufnr, int count)
1462 {
1463         int used, cc, diff;
1464
1465         if (!q->u.in.polling)
1466                 goto set;
1467
1468         /* protect against stop polling setting an ACK for an emptied slsb */
1469         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1470                 /* overwriting everything, just delete polling status */
1471                 q->u.in.polling = 0;
1472                 q->u.in.ack_count = 0;
1473                 goto set;
1474         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1475                 if (is_qebsm(q)) {
1476                         /* partial overwrite, just update ack_start */
1477                         diff = add_buf(bufnr, count);
1478                         diff = sub_buf(diff, q->u.in.ack_start);
1479                         q->u.in.ack_count -= diff;
1480                         if (q->u.in.ack_count <= 0) {
1481                                 q->u.in.polling = 0;
1482                                 q->u.in.ack_count = 0;
1483                                 goto set;
1484                         }
1485                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1486                 }
1487                 else
1488                         /* the only ACK will be deleted, so stop polling */
1489                         q->u.in.polling = 0;
1490         }
1491
1492 set:
1493         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1494
1495         used = atomic_add_return(count, &q->nr_buf_used) - count;
1496         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1497
1498         /* no need to signal as long as the adapter had free buffers */
1499         if (used)
1500                 return;
1501
1502         if (need_siga_in(q)) {
1503                 cc = qdio_siga_input(q);
1504                 if (cc)
1505                         q->qdio_error = cc;
1506         }
1507 }
1508
1509 /**
1510  * handle_outbound - process filled outbound buffers
1511  * @q: queue containing the buffers
1512  * @callflags: flags
1513  * @bufnr: first buffer to process
1514  * @count: how many buffers are filled
1515  */
1516 static void handle_outbound(struct qdio_q *q, unsigned int callflags,
1517                             int bufnr, int count)
1518 {
1519         unsigned char state;
1520         int used;
1521
1522         qdio_perf_stat_inc(&perf_stats.outbound_handler);
1523
1524         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1525         used = atomic_add_return(count, &q->nr_buf_used);
1526         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1527
1528         if (callflags & QDIO_FLAG_PCI_OUT)
1529                 q->u.out.pci_out_enabled = 1;
1530         else
1531                 q->u.out.pci_out_enabled = 0;
1532
1533         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1534                 if (multicast_outbound(q))
1535                         qdio_kick_outbound_q(q);
1536                 else
1537                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1538                             (count > 1) &&
1539                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1540                                 /* exploit enhanced SIGA */
1541                                 q->u.out.use_enh_siga = 1;
1542                                 qdio_kick_outbound_q(q);
1543                         } else {
1544                                 /*
1545                                 * One siga-w per buffer required for unicast
1546                                 * HiperSockets.
1547                                 */
1548                                 q->u.out.use_enh_siga = 0;
1549                                 while (count--)
1550                                         qdio_kick_outbound_q(q);
1551                         }
1552
1553                 /* report CC=2 conditions synchronously */
1554                 if (q->qdio_error)
1555                         __qdio_outbound_processing(q);
1556                 goto out;
1557         }
1558
1559         if (need_siga_sync(q)) {
1560                 qdio_siga_sync_q(q);
1561                 goto out;
1562         }
1563
1564         /* try to fast requeue buffers */
1565         get_buf_state(q, prev_buf(bufnr), &state, 0);
1566         if (state != SLSB_CU_OUTPUT_PRIMED)
1567                 qdio_kick_outbound_q(q);
1568         else {
1569                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1570                 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1571         }
1572 out:
1573         tasklet_schedule(&q->tasklet);
1574 }
1575
1576 /**
1577  * do_QDIO - process input or output buffers
1578  * @cdev: associated ccw_device for the qdio subchannel
1579  * @callflags: input or output and special flags from the program
1580  * @q_nr: queue number
1581  * @bufnr: buffer number
1582  * @count: how many buffers to process
1583  */
1584 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1585             int q_nr, int bufnr, int count)
1586 {
1587         struct qdio_irq *irq_ptr;
1588
1589         if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1590             (count > QDIO_MAX_BUFFERS_PER_Q) ||
1591             (q_nr > QDIO_MAX_QUEUES_PER_IRQ))
1592                 return -EINVAL;
1593
1594         if (!count)
1595                 return 0;
1596
1597         irq_ptr = cdev->private->qdio_data;
1598         if (!irq_ptr)
1599                 return -ENODEV;
1600
1601         if (callflags & QDIO_FLAG_SYNC_INPUT)
1602                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1603         else
1604                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1605         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1606         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1607
1608         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1609                 return -EBUSY;
1610
1611         if (callflags & QDIO_FLAG_SYNC_INPUT)
1612                 handle_inbound(irq_ptr->input_qs[q_nr], callflags, bufnr,
1613                                count);
1614         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1615                 handle_outbound(irq_ptr->output_qs[q_nr], callflags, bufnr,
1616                                 count);
1617         else
1618                 return -EINVAL;
1619         return 0;
1620 }
1621 EXPORT_SYMBOL_GPL(do_QDIO);
1622
1623 static int __init init_QDIO(void)
1624 {
1625         int rc;
1626
1627         rc = qdio_setup_init();
1628         if (rc)
1629                 return rc;
1630         rc = tiqdio_allocate_memory();
1631         if (rc)
1632                 goto out_cache;
1633         rc = qdio_debug_init();
1634         if (rc)
1635                 goto out_ti;
1636         rc = qdio_setup_perf_stats();
1637         if (rc)
1638                 goto out_debug;
1639         rc = tiqdio_register_thinints();
1640         if (rc)
1641                 goto out_perf;
1642         return 0;
1643
1644 out_perf:
1645         qdio_remove_perf_stats();
1646 out_debug:
1647         qdio_debug_exit();
1648 out_ti:
1649         tiqdio_free_memory();
1650 out_cache:
1651         qdio_setup_exit();
1652         return rc;
1653 }
1654
1655 static void __exit exit_QDIO(void)
1656 {
1657         tiqdio_unregister_thinints();
1658         tiqdio_free_memory();
1659         qdio_remove_perf_stats();
1660         qdio_debug_exit();
1661         qdio_setup_exit();
1662 }
1663
1664 module_init(init_QDIO);
1665 module_exit(exit_QDIO);