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_handler(struct qdio_q *q)
 574 {
 575         int start = q->first_to_kick;
 576         int end = q->first_to_check;
 577         int count;
 578
 579         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 580                 return;
 581
 582         count = sub_buf(end, start);
 583
 584         if (q->is_input_q) {
 585                 qdio_perf_stat_inc(&perf_stats.inbound_handler);
 586                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count);
 587         } else {
 588                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: nr:%1d", q->nr);
 589                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count);
 590         }
 591
 592         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 593                    q->irq_ptr->int_parm);
 594
 595         /* for the next time */
 596         q->first_to_kick = end;
 597         q->qdio_error = 0;
 598 }
 599
 600 static void __qdio_inbound_processing(struct qdio_q *q)
 601 {
 602         qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
 603 again:
 604         if (!qdio_inbound_q_moved(q))
 605                 return;
 606
 607         qdio_kick_handler(q);
 608
 609         if (!qdio_inbound_q_done(q))
 610                 /* means poll time is not yet over */
 611                 goto again;
 612
 613         qdio_stop_polling(q);
 614         /*
 615          * We need to check again to not lose initiative after
 616          * resetting the ACK state.
 617          */
 618         if (!qdio_inbound_q_done(q))
 619                 goto again;
 620 }
 621
 622 /* inbound tasklet */
 623 void qdio_inbound_processing(unsigned long data)
 624 {
 625         struct qdio_q *q = (struct qdio_q *)data;
 626         __qdio_inbound_processing(q);
 627 }
 628
 629 static int get_outbound_buffer_frontier(struct qdio_q *q)
 630 {
 631         int count, stop;
 632         unsigned char state;
 633
 634         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 635             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 636                 qdio_siga_sync_q(q);
 637
 638         /*
 639          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 640          * would return 0.
 641          */
 642         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 643         stop = add_buf(q->first_to_check, count);
 644
 645         /* need to set count to 1 for non-qebsm */
 646         if (!is_qebsm(q))
 647                 count = 1;
 648
 649 check_next:
 650         if (q->first_to_check == stop)
 651                 return q->first_to_check;
 652
 653         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 654         if (!count)
 655                 return q->first_to_check;
 656
 657         switch (state) {
 658         case SLSB_P_OUTPUT_EMPTY:
 659                 /* the adapter got it */
 660                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count);
 661
 662                 atomic_sub(count, &q->nr_buf_used);
 663                 q->first_to_check = add_buf(q->first_to_check, count);
 664                 /*
 665                  * We fetch all buffer states at once. get_buf_states may
 666                  * return count < stop. For QEBSM we do not loop.
 667                  */
 668                 if (is_qebsm(q))
 669                         break;
 670                 goto check_next;
 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                 break;
 677         case SLSB_CU_OUTPUT_PRIMED:
 678                 /* the adapter has not fetched the output yet */
 679                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 680                 break;
 681         case SLSB_P_OUTPUT_NOT_INIT:
 682         case SLSB_P_OUTPUT_HALTED:
 683                 break;
 684         default:
 685                 BUG();
 686         }
 687         return q->first_to_check;
 688 }
 689
 690 /* all buffers processed? */
 691 static inline int qdio_outbound_q_done(struct qdio_q *q)
 692 {
 693         return atomic_read(&q->nr_buf_used) == 0;
 694 }
 695
 696 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 697 {
 698         int bufnr;
 699
 700         bufnr = get_outbound_buffer_frontier(q);
 701
 702         if ((bufnr != q->last_move) || q->qdio_error) {
 703                 q->last_move = bufnr;
 704                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 705                 return 1;
 706         } else
 707                 return 0;
 708 }
 709
 710 static int qdio_kick_outbound_q(struct qdio_q *q)
 711 {
 712         unsigned int busy_bit;
 713         int cc;
 714
 715         if (!need_siga_out(q))
 716                 return 0;
 717
 718         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 719         qdio_perf_stat_inc(&perf_stats.siga_out);
 720
 721         cc = qdio_siga_output(q, &busy_bit);
 722         switch (cc) {
 723         case 0:
 724                 break;
 725         case 2:
 726                 if (busy_bit) {
 727                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 728                         cc |= QDIO_ERROR_SIGA_BUSY;
 729                 } else
 730                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 731                 break;
 732         case 1:
 733         case 3:
 734                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 735                 break;
 736         }
 737         return cc;
 738 }
 739
 740 static void __qdio_outbound_processing(struct qdio_q *q)
 741 {
 742         qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
 743         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 744
 745         if (qdio_outbound_q_moved(q))
 746                 qdio_kick_handler(q);
 747
 748         if (queue_type(q) == QDIO_ZFCP_QFMT)
 749                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 750                         goto sched;
 751
 752         /* bail out for HiperSockets unicast queues */
 753         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 754                 return;
 755
 756         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 757             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 758                 goto sched;
 759
 760         if (q->u.out.pci_out_enabled)
 761                 return;
 762
 763         /*
 764          * Now we know that queue type is either qeth without pci enabled
 765          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 766          * EMPTY is noticed and outbound_handler is called after some time.
 767          */
 768         if (qdio_outbound_q_done(q))
 769                 del_timer(&q->u.out.timer);
 770         else {
 771                 if (!timer_pending(&q->u.out.timer)) {
 772                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 773                         qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
 774                 }
 775         }
 776         return;
 777
 778 sched:
 779         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 780                 return;
 781         tasklet_schedule(&q->tasklet);
 782 }
 783
 784 /* outbound tasklet */
 785 void qdio_outbound_processing(unsigned long data)
 786 {
 787         struct qdio_q *q = (struct qdio_q *)data;
 788         __qdio_outbound_processing(q);
 789 }
 790
 791 void qdio_outbound_timer(unsigned long data)
 792 {
 793         struct qdio_q *q = (struct qdio_q *)data;
 794
 795         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 796                 return;
 797         tasklet_schedule(&q->tasklet);
 798 }
 799
 800 /* called from thinint inbound tasklet */
 801 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 inline void qdio_set_state(struct qdio_irq *irq_ptr,
 815                                   enum qdio_irq_states state)
 816 {
 817         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 818
 819         irq_ptr->state = state;
 820         mb();
 821 }
 822
 823 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 824 {
 825         if (irb->esw.esw0.erw.cons) {
 826                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 827                 DBF_ERROR_HEX(irb, 64);
 828                 DBF_ERROR_HEX(irb->ecw, 64);
 829         }
 830 }
 831
 832 /* PCI interrupt handler */
 833 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 834 {
 835         int i;
 836         struct qdio_q *q;
 837
 838         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 839                 return;
 840
 841         qdio_perf_stat_inc(&perf_stats.pci_int);
 842
 843         for_each_input_queue(irq_ptr, q, i)
 844                 tasklet_schedule(&q->tasklet);
 845
 846         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 847                 return;
 848
 849         for_each_output_queue(irq_ptr, q, i) {
 850                 if (qdio_outbound_q_done(q))
 851                         continue;
 852
 853                 if (!siga_syncs_out_pci(q))
 854                         qdio_siga_sync_q(q);
 855
 856                 tasklet_schedule(&q->tasklet);
 857         }
 858 }
 859
 860 static void qdio_handle_activate_check(struct ccw_device *cdev,
 861                                 unsigned long intparm, int cstat, int dstat)
 862 {
 863         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 864         struct qdio_q *q;
 865
 866         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 867         DBF_ERROR("intp :%lx", intparm);
 868         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 869
 870         if (irq_ptr->nr_input_qs) {
 871                 q = irq_ptr->input_qs[0];
 872         } else if (irq_ptr->nr_output_qs) {
 873                 q = irq_ptr->output_qs[0];
 874         } else {
 875                 dump_stack();
 876                 goto no_handler;
 877         }
 878         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 879                    0, -1, -1, irq_ptr->int_parm);
 880 no_handler:
 881         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 882 }
 883
 884 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 885                                       int dstat)
 886 {
 887         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 888
 889         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 890
 891         if (cstat)
 892                 goto error;
 893         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 894                 goto error;
 895         if (!(dstat & DEV_STAT_DEV_END))
 896                 goto error;
 897         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 898         return;
 899
 900 error:
 901         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 902         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 903         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 904 }
 905
 906 /* qdio interrupt handler */
 907 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 908                       struct irb *irb)
 909 {
 910         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 911         int cstat, dstat;
 912
 913         qdio_perf_stat_inc(&perf_stats.qdio_int);
 914
 915         if (!intparm || !irq_ptr) {
 916                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 917                 return;
 918         }
 919
 920         if (IS_ERR(irb)) {
 921                 switch (PTR_ERR(irb)) {
 922                 case -EIO:
 923                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 924                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 925                         wake_up(&cdev->private->wait_q);
 926                         return;
 927                 default:
 928                         WARN_ON(1);
 929                         return;
 930                 }
 931         }
 932         qdio_irq_check_sense(irq_ptr, irb);
 933         cstat = irb->scsw.cmd.cstat;
 934         dstat = irb->scsw.cmd.dstat;
 935
 936         switch (irq_ptr->state) {
 937         case QDIO_IRQ_STATE_INACTIVE:
 938                 qdio_establish_handle_irq(cdev, cstat, dstat);
 939                 break;
 940         case QDIO_IRQ_STATE_CLEANUP:
 941                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 942                 break;
 943         case QDIO_IRQ_STATE_ESTABLISHED:
 944         case QDIO_IRQ_STATE_ACTIVE:
 945                 if (cstat & SCHN_STAT_PCI) {
 946                         qdio_int_handler_pci(irq_ptr);
 947                         return;
 948                 }
 949                 if (cstat || dstat)
 950                         qdio_handle_activate_check(cdev, intparm, cstat,
 951                                                    dstat);
 952                 break;
 953         default:
 954                 WARN_ON(1);
 955         }
 956         wake_up(&cdev->private->wait_q);
 957 }
 958
 959 /**
 960  * qdio_get_ssqd_desc - get qdio subchannel description
 961  * @cdev: ccw device to get description for
 962  * @data: where to store the ssqd
 963  *
 964  * Returns 0 or an error code. The results of the chsc are stored in the
 965  * specified structure.
 966  */
 967 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 968                        struct qdio_ssqd_desc *data)
 969 {
 970
 971         if (!cdev || !cdev->private)
 972                 return -EINVAL;
 973
 974         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
 975         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
 976 }
 977 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 978
 979 /**
 980  * qdio_cleanup - shutdown queues and free data structures
 981  * @cdev: associated ccw device
 982  * @how: use halt or clear to shutdown
 983  *
 984  * This function calls qdio_shutdown() for @cdev with method @how.
 985  * and qdio_free(). The qdio_free() return value is ignored since
 986  * !irq_ptr is already checked.
 987  */
 988 int qdio_cleanup(struct ccw_device *cdev, int how)
 989 {
 990         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 991         int rc;
 992
 993         if (!irq_ptr)
 994                 return -ENODEV;
 995
 996         rc = qdio_shutdown(cdev, how);
 997
 998         qdio_free(cdev);
 999         return rc;
1000 }
1001 EXPORT_SYMBOL_GPL(qdio_cleanup);
1002
1003 static void qdio_shutdown_queues(struct ccw_device *cdev)
1004 {
1005         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1006         struct qdio_q *q;
1007         int i;
1008
1009         for_each_input_queue(irq_ptr, q, i)
1010                 tasklet_kill(&q->tasklet);
1011
1012         for_each_output_queue(irq_ptr, q, i) {
1013                 del_timer(&q->u.out.timer);
1014                 tasklet_kill(&q->tasklet);
1015         }
1016 }
1017
1018 /**
1019  * qdio_shutdown - shut down a qdio subchannel
1020  * @cdev: associated ccw device
1021  * @how: use halt or clear to shutdown
1022  */
1023 int qdio_shutdown(struct ccw_device *cdev, int how)
1024 {
1025         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1026         int rc;
1027         unsigned long flags;
1028
1029         if (!irq_ptr)
1030                 return -ENODEV;
1031
1032         BUG_ON(irqs_disabled());
1033         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1034
1035         mutex_lock(&irq_ptr->setup_mutex);
1036         /*
1037          * Subchannel was already shot down. We cannot prevent being called
1038          * twice since cio may trigger a shutdown asynchronously.
1039          */
1040         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1041                 mutex_unlock(&irq_ptr->setup_mutex);
1042                 return 0;
1043         }
1044
1045         /*
1046          * Indicate that the device is going down. Scheduling the queue
1047          * tasklets is forbidden from here on.
1048          */
1049         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1050
1051         tiqdio_remove_input_queues(irq_ptr);
1052         qdio_shutdown_queues(cdev);
1053         qdio_shutdown_debug_entries(irq_ptr, cdev);
1054
1055         /* cleanup subchannel */
1056         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1057
1058         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1059                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1060         else
1061                 /* default behaviour is halt */
1062                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1063         if (rc) {
1064                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1065                 DBF_ERROR("rc:%4d", rc);
1066                 goto no_cleanup;
1067         }
1068
1069         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1070         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1071         wait_event_interruptible_timeout(cdev->private->wait_q,
1072                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1073                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1074                 10 * HZ);
1075         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1076
1077 no_cleanup:
1078         qdio_shutdown_thinint(irq_ptr);
1079
1080         /* restore interrupt handler */
1081         if ((void *)cdev->handler == (void *)qdio_int_handler)
1082                 cdev->handler = irq_ptr->orig_handler;
1083         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1084
1085         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1086         mutex_unlock(&irq_ptr->setup_mutex);
1087         if (rc)
1088                 return rc;
1089         return 0;
1090 }
1091 EXPORT_SYMBOL_GPL(qdio_shutdown);
1092
1093 /**
1094  * qdio_free - free data structures for a qdio subchannel
1095  * @cdev: associated ccw device
1096  */
1097 int qdio_free(struct ccw_device *cdev)
1098 {
1099         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1100
1101         if (!irq_ptr)
1102                 return -ENODEV;
1103
1104         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1105         mutex_lock(&irq_ptr->setup_mutex);
1106
1107         if (irq_ptr->debug_area != NULL) {
1108                 debug_unregister(irq_ptr->debug_area);
1109                 irq_ptr->debug_area = NULL;
1110         }
1111         cdev->private->qdio_data = NULL;
1112         mutex_unlock(&irq_ptr->setup_mutex);
1113
1114         qdio_release_memory(irq_ptr);
1115         return 0;
1116 }
1117 EXPORT_SYMBOL_GPL(qdio_free);
1118
1119 /**
1120  * qdio_initialize - allocate and establish queues for a qdio subchannel
1121  * @init_data: initialization data
1122  *
1123  * This function first allocates queues via qdio_allocate() and on success
1124  * establishes them via qdio_establish().
1125  */
1126 int qdio_initialize(struct qdio_initialize *init_data)
1127 {
1128         int rc;
1129
1130         rc = qdio_allocate(init_data);
1131         if (rc)
1132                 return rc;
1133
1134         rc = qdio_establish(init_data);
1135         if (rc)
1136                 qdio_free(init_data->cdev);
1137         return rc;
1138 }
1139 EXPORT_SYMBOL_GPL(qdio_initialize);
1140
1141 /**
1142  * qdio_allocate - allocate qdio queues and associated data
1143  * @init_data: initialization data
1144  */
1145 int qdio_allocate(struct qdio_initialize *init_data)
1146 {
1147         struct qdio_irq *irq_ptr;
1148
1149         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1150
1151         if ((init_data->no_input_qs && !init_data->input_handler) ||
1152             (init_data->no_output_qs && !init_data->output_handler))
1153                 return -EINVAL;
1154
1155         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1156             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1157                 return -EINVAL;
1158
1159         if ((!init_data->input_sbal_addr_array) ||
1160             (!init_data->output_sbal_addr_array))
1161                 return -EINVAL;
1162
1163         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1164         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1165         if (!irq_ptr)
1166                 goto out_err;
1167
1168         mutex_init(&irq_ptr->setup_mutex);
1169         qdio_allocate_dbf(init_data, irq_ptr);
1170
1171         /*
1172          * Allocate a page for the chsc calls in qdio_establish.
1173          * Must be pre-allocated since a zfcp recovery will call
1174          * qdio_establish. In case of low memory and swap on a zfcp disk
1175          * we may not be able to allocate memory otherwise.
1176          */
1177         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1178         if (!irq_ptr->chsc_page)
1179                 goto out_rel;
1180
1181         /* qdr is used in ccw1.cda which is u32 */
1182         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1183         if (!irq_ptr->qdr)
1184                 goto out_rel;
1185         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1186
1187         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1188                              init_data->no_output_qs))
1189                 goto out_rel;
1190
1191         init_data->cdev->private->qdio_data = irq_ptr;
1192         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1193         return 0;
1194 out_rel:
1195         qdio_release_memory(irq_ptr);
1196 out_err:
1197         return -ENOMEM;
1198 }
1199 EXPORT_SYMBOL_GPL(qdio_allocate);
1200
1201 /**
1202  * qdio_establish - establish queues on a qdio subchannel
1203  * @init_data: initialization data
1204  */
1205 int qdio_establish(struct qdio_initialize *init_data)
1206 {
1207         struct qdio_irq *irq_ptr;
1208         struct ccw_device *cdev = init_data->cdev;
1209         unsigned long saveflags;
1210         int rc;
1211
1212         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1213
1214         irq_ptr = cdev->private->qdio_data;
1215         if (!irq_ptr)
1216                 return -ENODEV;
1217
1218         if (cdev->private->state != DEV_STATE_ONLINE)
1219                 return -EINVAL;
1220
1221         mutex_lock(&irq_ptr->setup_mutex);
1222         qdio_setup_irq(init_data);
1223
1224         rc = qdio_establish_thinint(irq_ptr);
1225         if (rc) {
1226                 mutex_unlock(&irq_ptr->setup_mutex);
1227                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1228                 return rc;
1229         }
1230
1231         /* establish q */
1232         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1233         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1234         irq_ptr->ccw.count = irq_ptr->equeue.count;
1235         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1236
1237         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1238         ccw_device_set_options_mask(cdev, 0);
1239
1240         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1241         if (rc) {
1242                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1243                 DBF_ERROR("rc:%4x", rc);
1244         }
1245         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1246
1247         if (rc) {
1248                 mutex_unlock(&irq_ptr->setup_mutex);
1249                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1250                 return rc;
1251         }
1252
1253         wait_event_interruptible_timeout(cdev->private->wait_q,
1254                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1255                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1256
1257         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1258                 mutex_unlock(&irq_ptr->setup_mutex);
1259                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1260                 return -EIO;
1261         }
1262
1263         qdio_setup_ssqd_info(irq_ptr);
1264         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1265         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1266
1267         /* qebsm is now setup if available, initialize buffer states */
1268         qdio_init_buf_states(irq_ptr);
1269
1270         mutex_unlock(&irq_ptr->setup_mutex);
1271         qdio_print_subchannel_info(irq_ptr, cdev);
1272         qdio_setup_debug_entries(irq_ptr, cdev);
1273         return 0;
1274 }
1275 EXPORT_SYMBOL_GPL(qdio_establish);
1276
1277 /**
1278  * qdio_activate - activate queues on a qdio subchannel
1279  * @cdev: associated cdev
1280  */
1281 int qdio_activate(struct ccw_device *cdev)
1282 {
1283         struct qdio_irq *irq_ptr;
1284         int rc;
1285         unsigned long saveflags;
1286
1287         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1288
1289         irq_ptr = cdev->private->qdio_data;
1290         if (!irq_ptr)
1291                 return -ENODEV;
1292
1293         if (cdev->private->state != DEV_STATE_ONLINE)
1294                 return -EINVAL;
1295
1296         mutex_lock(&irq_ptr->setup_mutex);
1297         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1298                 rc = -EBUSY;
1299                 goto out;
1300         }
1301
1302         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1303         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1304         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1305         irq_ptr->ccw.cda = 0;
1306
1307         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1308         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1309
1310         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1311                               0, DOIO_DENY_PREFETCH);
1312         if (rc) {
1313                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1314                 DBF_ERROR("rc:%4x", rc);
1315         }
1316         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1317
1318         if (rc)
1319                 goto out;
1320
1321         if (is_thinint_irq(irq_ptr))
1322                 tiqdio_add_input_queues(irq_ptr);
1323
1324         /* wait for subchannel to become active */
1325         msleep(5);
1326
1327         switch (irq_ptr->state) {
1328         case QDIO_IRQ_STATE_STOPPED:
1329         case QDIO_IRQ_STATE_ERR:
1330                 rc = -EIO;
1331                 break;
1332         default:
1333                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1334                 rc = 0;
1335         }
1336 out:
1337         mutex_unlock(&irq_ptr->setup_mutex);
1338         return rc;
1339 }
1340 EXPORT_SYMBOL_GPL(qdio_activate);
1341
1342 static inline int buf_in_between(int bufnr, int start, int count)
1343 {
1344         int end = add_buf(start, count);
1345
1346         if (end > start) {
1347                 if (bufnr >= start && bufnr < end)
1348                         return 1;
1349                 else
1350                         return 0;
1351         }
1352
1353         /* wrap-around case */
1354         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1355             (bufnr < end))
1356                 return 1;
1357         else
1358                 return 0;
1359 }
1360
1361 /**
1362  * handle_inbound - reset processed input buffers
1363  * @q: queue containing the buffers
1364  * @callflags: flags
1365  * @bufnr: first buffer to process
1366  * @count: how many buffers are emptied
1367  */
1368 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1369                           int bufnr, int count)
1370 {
1371         int used, diff;
1372
1373         if (!q->u.in.polling)
1374                 goto set;
1375
1376         /* protect against stop polling setting an ACK for an emptied slsb */
1377         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1378                 /* overwriting everything, just delete polling status */
1379                 q->u.in.polling = 0;
1380                 q->u.in.ack_count = 0;
1381                 goto set;
1382         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1383                 if (is_qebsm(q)) {
1384                         /* partial overwrite, just update ack_start */
1385                         diff = add_buf(bufnr, count);
1386                         diff = sub_buf(diff, q->u.in.ack_start);
1387                         q->u.in.ack_count -= diff;
1388                         if (q->u.in.ack_count <= 0) {
1389                                 q->u.in.polling = 0;
1390                                 q->u.in.ack_count = 0;
1391                                 goto set;
1392                         }
1393                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1394                 }
1395                 else
1396                         /* the only ACK will be deleted, so stop polling */
1397                         q->u.in.polling = 0;
1398         }
1399
1400 set:
1401         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1402
1403         used = atomic_add_return(count, &q->nr_buf_used) - count;
1404         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1405
1406         /* no need to signal as long as the adapter had free buffers */
1407         if (used)
1408                 return 0;
1409
1410         if (need_siga_in(q))
1411                 return qdio_siga_input(q);
1412         return 0;
1413 }
1414
1415 /**
1416  * handle_outbound - process filled outbound buffers
1417  * @q: queue containing the buffers
1418  * @callflags: flags
1419  * @bufnr: first buffer to process
1420  * @count: how many buffers are filled
1421  */
1422 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1423                            int bufnr, int count)
1424 {
1425         unsigned char state;
1426         int used, rc = 0;
1427
1428         qdio_perf_stat_inc(&perf_stats.outbound_handler);
1429
1430         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1431         used = atomic_add_return(count, &q->nr_buf_used);
1432         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1433
1434         if (callflags & QDIO_FLAG_PCI_OUT)
1435                 q->u.out.pci_out_enabled = 1;
1436         else
1437                 q->u.out.pci_out_enabled = 0;
1438
1439         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1440                 if (multicast_outbound(q))
1441                         rc = qdio_kick_outbound_q(q);
1442                 else
1443                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1444                             (count > 1) &&
1445                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1446                                 /* exploit enhanced SIGA */
1447                                 q->u.out.use_enh_siga = 1;
1448                                 rc = qdio_kick_outbound_q(q);
1449                         } else {
1450                                 /*
1451                                 * One siga-w per buffer required for unicast
1452                                 * HiperSockets.
1453                                 */
1454                                 q->u.out.use_enh_siga = 0;
1455                                 while (count--) {
1456                                         rc = qdio_kick_outbound_q(q);
1457                                         if (rc)
1458                                                 goto out;
1459                                 }
1460                         }
1461                 goto out;
1462         }
1463
1464         if (need_siga_sync(q)) {
1465                 qdio_siga_sync_q(q);
1466                 goto out;
1467         }
1468
1469         /* try to fast requeue buffers */
1470         get_buf_state(q, prev_buf(bufnr), &state, 0);
1471         if (state != SLSB_CU_OUTPUT_PRIMED)
1472                 rc = qdio_kick_outbound_q(q);
1473         else {
1474                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1475                 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1476         }
1477 out:
1478         tasklet_schedule(&q->tasklet);
1479         return rc;
1480 }
1481
1482 /**
1483  * do_QDIO - process input or output buffers
1484  * @cdev: associated ccw_device for the qdio subchannel
1485  * @callflags: input or output and special flags from the program
1486  * @q_nr: queue number
1487  * @bufnr: buffer number
1488  * @count: how many buffers to process
1489  */
1490 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1491             int q_nr, int bufnr, int count)
1492 {
1493         struct qdio_irq *irq_ptr;
1494
1495         if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1496             (count > QDIO_MAX_BUFFERS_PER_Q) ||
1497             (q_nr >= QDIO_MAX_QUEUES_PER_IRQ))
1498                 return -EINVAL;
1499
1500         if (!count)
1501                 return 0;
1502
1503         irq_ptr = cdev->private->qdio_data;
1504         if (!irq_ptr)
1505                 return -ENODEV;
1506
1507         if (callflags & QDIO_FLAG_SYNC_INPUT)
1508                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1509         else
1510                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1511         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1512         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1513
1514         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1515                 return -EBUSY;
1516
1517         if (callflags & QDIO_FLAG_SYNC_INPUT)
1518                 return handle_inbound(irq_ptr->input_qs[q_nr],
1519                                       callflags, bufnr, count);
1520         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1521                 return handle_outbound(irq_ptr->output_qs[q_nr],
1522                                        callflags, bufnr, count);
1523         return -EINVAL;
1524 }
1525 EXPORT_SYMBOL_GPL(do_QDIO);
1526
1527 static int __init init_QDIO(void)
1528 {
1529         int rc;
1530
1531         rc = qdio_setup_init();
1532         if (rc)
1533                 return rc;
1534         rc = tiqdio_allocate_memory();
1535         if (rc)
1536                 goto out_cache;
1537         rc = qdio_debug_init();
1538         if (rc)
1539                 goto out_ti;
1540         rc = qdio_setup_perf_stats();
1541         if (rc)
1542                 goto out_debug;
1543         rc = tiqdio_register_thinints();
1544         if (rc)
1545                 goto out_perf;
1546         return 0;
1547
1548 out_perf:
1549         qdio_remove_perf_stats();
1550 out_debug:
1551         qdio_debug_exit();
1552 out_ti:
1553         tiqdio_free_memory();
1554 out_cache:
1555         qdio_setup_exit();
1556         return rc;
1557 }
1558
1559 static void __exit exit_QDIO(void)
1560 {
1561         tiqdio_unregister_thinints();
1562         tiqdio_free_memory();
1563         qdio_remove_perf_stats();
1564         qdio_debug_exit();
1565         qdio_setup_exit();
1566 }
1567
1568 module_init(init_QDIO);
1569 module_exit(exit_QDIO);