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 <[email protected]>
   8  *            Jan Glauber <[email protected]>
   9  * 2.6 cio integration by Cornelia Huck <[email protected]>
  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 <[email protected]>,"\
  28         "Jan Glauber <[email protected]>");
  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->last_move_ftc, 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->last_move_ftc, 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->last_move_ftc = q->first_to_check;
 423                         return;
 424                 }
 425
 426                 /* delete the previous ACK's */
 427                 set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT,
 428                                q->u.in.ack_count);
 429                 q->u.in.ack_count = count;
 430                 q->last_move_ftc = 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->last_move_ftc, SLSB_P_INPUT_NOT_INIT);
 443         }
 444         else {
 445                 q->u.in.polling = 1;
 446                 set_buf_state(q, q->first_to_check, SLSB_P_INPUT_ACK);
 447         }
 448
 449         q->last_move_ftc = new;
 450         count--;
 451         if (!count)
 452                 return;
 453
 454         /*
 455          * Need to change all PRIMED buffers to NOT_INIT, otherwise
 456          * we're loosing initiative in the thinint code.
 457          */
 458         set_buf_states(q, next_buf(q->first_to_check), SLSB_P_INPUT_NOT_INIT,
 459                        count);
 460 }
 461
 462 static int get_inbound_buffer_frontier(struct qdio_q *q)
 463 {
 464         int count, stop;
 465         unsigned char state;
 466
 467         /*
 468          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 469          * would return 0.
 470          */
 471         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 472         stop = add_buf(q->first_to_check, count);
 473
 474         /*
 475          * No siga sync here, as a PCI or we after a thin interrupt
 476          * will sync the queues.
 477          */
 478
 479         /* need to set count to 1 for non-qebsm */
 480         if (!is_qebsm(q))
 481                 count = 1;
 482
 483 check_next:
 484         if (q->first_to_check == stop)
 485                 goto out;
 486
 487         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 488         if (!count)
 489                 goto out;
 490
 491         switch (state) {
 492         case SLSB_P_INPUT_PRIMED:
 493                 inbound_primed(q, count);
 494                 /*
 495                  * No siga-sync needed for non-qebsm here, as the inbound queue
 496                  * will be synced on the next siga-r, resp.
 497                  * tiqdio_is_inbound_q_done will do the siga-sync.
 498                  */
 499                 q->first_to_check = add_buf(q->first_to_check, count);
 500                 atomic_sub(count, &q->nr_buf_used);
 501                 goto check_next;
 502         case SLSB_P_INPUT_ERROR:
 503                 announce_buffer_error(q, count);
 504                 /* process the buffer, the upper layer will take care of it */
 505                 q->first_to_check = add_buf(q->first_to_check, count);
 506                 atomic_sub(count, &q->nr_buf_used);
 507                 break;
 508         case SLSB_CU_INPUT_EMPTY:
 509         case SLSB_P_INPUT_NOT_INIT:
 510         case SLSB_P_INPUT_ACK:
 511                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 512                 break;
 513         default:
 514                 BUG();
 515         }
 516 out:
 517         return q->first_to_check;
 518 }
 519
 520 int qdio_inbound_q_moved(struct qdio_q *q)
 521 {
 522         int bufnr;
 523
 524         bufnr = get_inbound_buffer_frontier(q);
 525
 526         if ((bufnr != q->last_move_ftc) || q->qdio_error) {
 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_ftc) || q->qdio_error) {
 702                 q->last_move_ftc = 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_ftc;
 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_ftc;
 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                         tasklet_schedule(&q->tasklet);
 784                 return;
 785         }
 786
 787         /* bail out for HiperSockets unicast queues */
 788         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 789                 return;
 790
 791         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 792             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) {
 793                 tasklet_schedule(&q->tasklet);
 794                 return;
 795         }
 796
 797         if (q->u.out.pci_out_enabled)
 798                 return;
 799
 800         /*
 801          * Now we know that queue type is either qeth without pci enabled
 802          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 803          * EMPTY is noticed and outbound_handler is called after some time.
 804          */
 805         if (qdio_outbound_q_done(q))
 806                 del_timer(&q->u.out.timer);
 807         else {
 808                 if (!timer_pending(&q->u.out.timer)) {
 809                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 810                         qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
 811                 }
 812         }
 813 }
 814
 815 /* outbound tasklet */
 816 void qdio_outbound_processing(unsigned long data)
 817 {
 818         struct qdio_q *q = (struct qdio_q *)data;
 819         __qdio_outbound_processing(q);
 820 }
 821
 822 void qdio_outbound_timer(unsigned long data)
 823 {
 824         struct qdio_q *q = (struct qdio_q *)data;
 825         tasklet_schedule(&q->tasklet);
 826 }
 827
 828 /* called from thinint inbound tasklet */
 829 void qdio_check_outbound_after_thinint(struct qdio_q *q)
 830 {
 831         struct qdio_q *out;
 832         int i;
 833
 834         if (!pci_out_supported(q))
 835                 return;
 836
 837         for_each_output_queue(q->irq_ptr, out, i)
 838                 if (!qdio_outbound_q_done(out))
 839                         tasklet_schedule(&out->tasklet);
 840 }
 841
 842 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 843                                   enum qdio_irq_states state)
 844 {
 845         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 846
 847         irq_ptr->state = state;
 848         mb();
 849 }
 850
 851 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 852 {
 853         if (irb->esw.esw0.erw.cons) {
 854                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 855                 DBF_ERROR_HEX(irb, 64);
 856                 DBF_ERROR_HEX(irb->ecw, 64);
 857         }
 858 }
 859
 860 /* PCI interrupt handler */
 861 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 862 {
 863         int i;
 864         struct qdio_q *q;
 865
 866         qdio_perf_stat_inc(&perf_stats.pci_int);
 867
 868         for_each_input_queue(irq_ptr, q, i)
 869                 tasklet_schedule(&q->tasklet);
 870
 871         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 872                 return;
 873
 874         for_each_output_queue(irq_ptr, q, i) {
 875                 if (qdio_outbound_q_done(q))
 876                         continue;
 877
 878                 if (!siga_syncs_out_pci(q))
 879                         qdio_siga_sync_q(q);
 880
 881                 tasklet_schedule(&q->tasklet);
 882         }
 883 }
 884
 885 static void qdio_handle_activate_check(struct ccw_device *cdev,
 886                                 unsigned long intparm, int cstat, int dstat)
 887 {
 888         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 889         struct qdio_q *q;
 890
 891         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 892         DBF_ERROR("intp :%lx", intparm);
 893         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 894
 895         if (irq_ptr->nr_input_qs) {
 896                 q = irq_ptr->input_qs[0];
 897         } else if (irq_ptr->nr_output_qs) {
 898                 q = irq_ptr->output_qs[0];
 899         } else {
 900                 dump_stack();
 901                 goto no_handler;
 902         }
 903         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 904                    0, -1, -1, irq_ptr->int_parm);
 905 no_handler:
 906         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 907 }
 908
 909 static void qdio_call_shutdown(struct work_struct *work)
 910 {
 911         struct ccw_device_private *priv;
 912         struct ccw_device *cdev;
 913
 914         priv = container_of(work, struct ccw_device_private, kick_work);
 915         cdev = priv->cdev;
 916         qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
 917         put_device(&cdev->dev);
 918 }
 919
 920 static void qdio_int_error(struct ccw_device *cdev)
 921 {
 922         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 923
 924         switch (irq_ptr->state) {
 925         case QDIO_IRQ_STATE_INACTIVE:
 926         case QDIO_IRQ_STATE_CLEANUP:
 927                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 928                 break;
 929         case QDIO_IRQ_STATE_ESTABLISHED:
 930         case QDIO_IRQ_STATE_ACTIVE:
 931                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 932                 if (get_device(&cdev->dev)) {
 933                         /* Can't call shutdown from interrupt context. */
 934                         PREPARE_WORK(&cdev->private->kick_work,
 935                                      qdio_call_shutdown);
 936                         queue_work(ccw_device_work, &cdev->private->kick_work);
 937                 }
 938                 break;
 939         default:
 940                 WARN_ON(1);
 941         }
 942         wake_up(&cdev->private->wait_q);
 943 }
 944
 945 static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat,
 946                                        int dstat)
 947 {
 948         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 949
 950         if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
 951                 DBF_ERROR("EQ:ck con");
 952                 goto error;
 953         }
 954
 955         if (!(dstat & DEV_STAT_DEV_END)) {
 956                 DBF_ERROR("EQ:no dev");
 957                 goto error;
 958         }
 959
 960         if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) {
 961                 DBF_ERROR("EQ: bad io");
 962                 goto error;
 963         }
 964         return 0;
 965 error:
 966         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 967         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 968
 969         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 970         return 1;
 971 }
 972
 973 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 974                                       int dstat)
 975 {
 976         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 977
 978         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 979         if (!qdio_establish_check_errors(cdev, cstat, dstat))
 980                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 981 }
 982
 983 /* qdio interrupt handler */
 984 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 985                       struct irb *irb)
 986 {
 987         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 988         int cstat, dstat;
 989
 990         qdio_perf_stat_inc(&perf_stats.qdio_int);
 991
 992         if (!intparm || !irq_ptr) {
 993                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 994                 return;
 995         }
 996
 997         if (IS_ERR(irb)) {
 998                 switch (PTR_ERR(irb)) {
 999                 case -EIO:
1000                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1001                         return;
1002                 case -ETIMEDOUT:
1003                         DBF_ERROR("%4x IO timeout", irq_ptr->schid.sch_no);
1004                         qdio_int_error(cdev);
1005                         return;
1006                 default:
1007                         WARN_ON(1);
1008                         return;
1009                 }
1010         }
1011         qdio_irq_check_sense(irq_ptr, irb);
1012
1013         cstat = irb->scsw.cmd.cstat;
1014         dstat = irb->scsw.cmd.dstat;
1015
1016         switch (irq_ptr->state) {
1017         case QDIO_IRQ_STATE_INACTIVE:
1018                 qdio_establish_handle_irq(cdev, cstat, dstat);
1019                 break;
1020
1021         case QDIO_IRQ_STATE_CLEANUP:
1022                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1023                 break;
1024
1025         case QDIO_IRQ_STATE_ESTABLISHED:
1026         case QDIO_IRQ_STATE_ACTIVE:
1027                 if (cstat & SCHN_STAT_PCI) {
1028                         qdio_int_handler_pci(irq_ptr);
1029                         /* no state change so no need to wake up wait_q */
1030                         return;
1031                 }
1032                 if ((cstat & ~SCHN_STAT_PCI) || dstat) {
1033                         qdio_handle_activate_check(cdev, intparm, cstat,
1034                                                    dstat);
1035                         break;
1036                 }
1037         default:
1038                 WARN_ON(1);
1039         }
1040         wake_up(&cdev->private->wait_q);
1041 }
1042
1043 /**
1044  * qdio_get_ssqd_desc - get qdio subchannel description
1045  * @cdev: ccw device to get description for
1046  * @data: where to store the ssqd
1047  *
1048  * Returns 0 or an error code. The results of the chsc are stored in the
1049  * specified structure.
1050  */
1051 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1052                        struct qdio_ssqd_desc *data)
1053 {
1054
1055         if (!cdev || !cdev->private)
1056                 return -EINVAL;
1057
1058         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1059         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1060 }
1061 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1062
1063 /**
1064  * qdio_cleanup - shutdown queues and free data structures
1065  * @cdev: associated ccw device
1066  * @how: use halt or clear to shutdown
1067  *
1068  * This function calls qdio_shutdown() for @cdev with method @how
1069  * and on success qdio_free() for @cdev.
1070  */
1071 int qdio_cleanup(struct ccw_device *cdev, int how)
1072 {
1073         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1074         int rc;
1075
1076         if (!irq_ptr)
1077                 return -ENODEV;
1078
1079         rc = qdio_shutdown(cdev, how);
1080         if (rc == 0)
1081                 rc = qdio_free(cdev);
1082         return rc;
1083 }
1084 EXPORT_SYMBOL_GPL(qdio_cleanup);
1085
1086 static void qdio_shutdown_queues(struct ccw_device *cdev)
1087 {
1088         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1089         struct qdio_q *q;
1090         int i;
1091
1092         for_each_input_queue(irq_ptr, q, i)
1093                 tasklet_disable(&q->tasklet);
1094
1095         for_each_output_queue(irq_ptr, q, i) {
1096                 tasklet_disable(&q->tasklet);
1097                 del_timer(&q->u.out.timer);
1098         }
1099 }
1100
1101 /**
1102  * qdio_shutdown - shut down a qdio subchannel
1103  * @cdev: associated ccw device
1104  * @how: use halt or clear to shutdown
1105  */
1106 int qdio_shutdown(struct ccw_device *cdev, int how)
1107 {
1108         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1109         int rc;
1110         unsigned long flags;
1111
1112         if (!irq_ptr)
1113                 return -ENODEV;
1114
1115         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1116
1117         mutex_lock(&irq_ptr->setup_mutex);
1118         /*
1119          * Subchannel was already shot down. We cannot prevent being called
1120          * twice since cio may trigger a shutdown asynchronously.
1121          */
1122         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1123                 mutex_unlock(&irq_ptr->setup_mutex);
1124                 return 0;
1125         }
1126
1127         tiqdio_remove_input_queues(irq_ptr);
1128         qdio_shutdown_queues(cdev);
1129         qdio_shutdown_debug_entries(irq_ptr, cdev);
1130
1131         /* cleanup subchannel */
1132         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1133
1134         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1135                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1136         else
1137                 /* default behaviour is halt */
1138                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1139         if (rc) {
1140                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1141                 DBF_ERROR("rc:%4d", rc);
1142                 goto no_cleanup;
1143         }
1144
1145         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1146         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1147         wait_event_interruptible_timeout(cdev->private->wait_q,
1148                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1149                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1150                 10 * HZ);
1151         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1152
1153 no_cleanup:
1154         qdio_shutdown_thinint(irq_ptr);
1155
1156         /* restore interrupt handler */
1157         if ((void *)cdev->handler == (void *)qdio_int_handler)
1158                 cdev->handler = irq_ptr->orig_handler;
1159         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1160
1161         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1162         mutex_unlock(&irq_ptr->setup_mutex);
1163         if (rc)
1164                 return rc;
1165         return 0;
1166 }
1167 EXPORT_SYMBOL_GPL(qdio_shutdown);
1168
1169 /**
1170  * qdio_free - free data structures for a qdio subchannel
1171  * @cdev: associated ccw device
1172  */
1173 int qdio_free(struct ccw_device *cdev)
1174 {
1175         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1176
1177         if (!irq_ptr)
1178                 return -ENODEV;
1179
1180         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1181         mutex_lock(&irq_ptr->setup_mutex);
1182
1183         if (irq_ptr->debug_area != NULL) {
1184                 debug_unregister(irq_ptr->debug_area);
1185                 irq_ptr->debug_area = NULL;
1186         }
1187         cdev->private->qdio_data = NULL;
1188         mutex_unlock(&irq_ptr->setup_mutex);
1189
1190         qdio_release_memory(irq_ptr);
1191         return 0;
1192 }
1193 EXPORT_SYMBOL_GPL(qdio_free);
1194
1195 /**
1196  * qdio_initialize - allocate and establish queues for a qdio subchannel
1197  * @init_data: initialization data
1198  *
1199  * This function first allocates queues via qdio_allocate() and on success
1200  * establishes them via qdio_establish().
1201  */
1202 int qdio_initialize(struct qdio_initialize *init_data)
1203 {
1204         int rc;
1205
1206         rc = qdio_allocate(init_data);
1207         if (rc)
1208                 return rc;
1209
1210         rc = qdio_establish(init_data);
1211         if (rc)
1212                 qdio_free(init_data->cdev);
1213         return rc;
1214 }
1215 EXPORT_SYMBOL_GPL(qdio_initialize);
1216
1217 /**
1218  * qdio_allocate - allocate qdio queues and associated data
1219  * @init_data: initialization data
1220  */
1221 int qdio_allocate(struct qdio_initialize *init_data)
1222 {
1223         struct qdio_irq *irq_ptr;
1224
1225         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1226
1227         if ((init_data->no_input_qs && !init_data->input_handler) ||
1228             (init_data->no_output_qs && !init_data->output_handler))
1229                 return -EINVAL;
1230
1231         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1232             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1233                 return -EINVAL;
1234
1235         if ((!init_data->input_sbal_addr_array) ||
1236             (!init_data->output_sbal_addr_array))
1237                 return -EINVAL;
1238
1239         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1240         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1241         if (!irq_ptr)
1242                 goto out_err;
1243
1244         mutex_init(&irq_ptr->setup_mutex);
1245         qdio_allocate_dbf(init_data, irq_ptr);
1246
1247         /*
1248          * Allocate a page for the chsc calls in qdio_establish.
1249          * Must be pre-allocated since a zfcp recovery will call
1250          * qdio_establish. In case of low memory and swap on a zfcp disk
1251          * we may not be able to allocate memory otherwise.
1252          */
1253         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1254         if (!irq_ptr->chsc_page)
1255                 goto out_rel;
1256
1257         /* qdr is used in ccw1.cda which is u32 */
1258         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1259         if (!irq_ptr->qdr)
1260                 goto out_rel;
1261         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1262
1263         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1264                              init_data->no_output_qs))
1265                 goto out_rel;
1266
1267         init_data->cdev->private->qdio_data = irq_ptr;
1268         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1269         return 0;
1270 out_rel:
1271         qdio_release_memory(irq_ptr);
1272 out_err:
1273         return -ENOMEM;
1274 }
1275 EXPORT_SYMBOL_GPL(qdio_allocate);
1276
1277 /**
1278  * qdio_establish - establish queues on a qdio subchannel
1279  * @init_data: initialization data
1280  */
1281 int qdio_establish(struct qdio_initialize *init_data)
1282 {
1283         struct qdio_irq *irq_ptr;
1284         struct ccw_device *cdev = init_data->cdev;
1285         unsigned long saveflags;
1286         int rc;
1287
1288         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1289
1290         irq_ptr = cdev->private->qdio_data;
1291         if (!irq_ptr)
1292                 return -ENODEV;
1293
1294         if (cdev->private->state != DEV_STATE_ONLINE)
1295                 return -EINVAL;
1296
1297         mutex_lock(&irq_ptr->setup_mutex);
1298         qdio_setup_irq(init_data);
1299
1300         rc = qdio_establish_thinint(irq_ptr);
1301         if (rc) {
1302                 mutex_unlock(&irq_ptr->setup_mutex);
1303                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1304                 return rc;
1305         }
1306
1307         /* establish q */
1308         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1309         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1310         irq_ptr->ccw.count = irq_ptr->equeue.count;
1311         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1312
1313         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1314         ccw_device_set_options_mask(cdev, 0);
1315
1316         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1317         if (rc) {
1318                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1319                 DBF_ERROR("rc:%4x", rc);
1320         }
1321         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1322
1323         if (rc) {
1324                 mutex_unlock(&irq_ptr->setup_mutex);
1325                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1326                 return rc;
1327         }
1328
1329         wait_event_interruptible_timeout(cdev->private->wait_q,
1330                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1331                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1332
1333         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1334                 mutex_unlock(&irq_ptr->setup_mutex);
1335                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1336                 return -EIO;
1337         }
1338
1339         qdio_setup_ssqd_info(irq_ptr);
1340         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1341         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1342
1343         /* qebsm is now setup if available, initialize buffer states */
1344         qdio_init_buf_states(irq_ptr);
1345
1346         mutex_unlock(&irq_ptr->setup_mutex);
1347         qdio_print_subchannel_info(irq_ptr, cdev);
1348         qdio_setup_debug_entries(irq_ptr, cdev);
1349         return 0;
1350 }
1351 EXPORT_SYMBOL_GPL(qdio_establish);
1352
1353 /**
1354  * qdio_activate - activate queues on a qdio subchannel
1355  * @cdev: associated cdev
1356  */
1357 int qdio_activate(struct ccw_device *cdev)
1358 {
1359         struct qdio_irq *irq_ptr;
1360         int rc;
1361         unsigned long saveflags;
1362
1363         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1364
1365         irq_ptr = cdev->private->qdio_data;
1366         if (!irq_ptr)
1367                 return -ENODEV;
1368
1369         if (cdev->private->state != DEV_STATE_ONLINE)
1370                 return -EINVAL;
1371
1372         mutex_lock(&irq_ptr->setup_mutex);
1373         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1374                 rc = -EBUSY;
1375                 goto out;
1376         }
1377
1378         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1379         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1380         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1381         irq_ptr->ccw.cda = 0;
1382
1383         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1384         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1385
1386         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1387                               0, DOIO_DENY_PREFETCH);
1388         if (rc) {
1389                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1390                 DBF_ERROR("rc:%4x", rc);
1391         }
1392         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1393
1394         if (rc)
1395                 goto out;
1396
1397         if (is_thinint_irq(irq_ptr))
1398                 tiqdio_add_input_queues(irq_ptr);
1399
1400         /* wait for subchannel to become active */
1401         msleep(5);
1402
1403         switch (irq_ptr->state) {
1404         case QDIO_IRQ_STATE_STOPPED:
1405         case QDIO_IRQ_STATE_ERR:
1406                 mutex_unlock(&irq_ptr->setup_mutex);
1407                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1408                 return -EIO;
1409         default:
1410                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1411                 rc = 0;
1412         }
1413 out:
1414         mutex_unlock(&irq_ptr->setup_mutex);
1415         return rc;
1416 }
1417 EXPORT_SYMBOL_GPL(qdio_activate);
1418
1419 static inline int buf_in_between(int bufnr, int start, int count)
1420 {
1421         int end = add_buf(start, count);
1422
1423         if (end > start) {
1424                 if (bufnr >= start && bufnr < end)
1425                         return 1;
1426                 else
1427                         return 0;
1428         }
1429
1430         /* wrap-around case */
1431         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1432             (bufnr < end))
1433                 return 1;
1434         else
1435                 return 0;
1436 }
1437
1438 /**
1439  * handle_inbound - reset processed input buffers
1440  * @q: queue containing the buffers
1441  * @callflags: flags
1442  * @bufnr: first buffer to process
1443  * @count: how many buffers are emptied
1444  */
1445 static void handle_inbound(struct qdio_q *q, unsigned int callflags,
1446                            int bufnr, int count)
1447 {
1448         int used, cc, diff;
1449
1450         if (!q->u.in.polling)
1451                 goto set;
1452
1453         /* protect against stop polling setting an ACK for an emptied slsb */
1454         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1455                 /* overwriting everything, just delete polling status */
1456                 q->u.in.polling = 0;
1457                 q->u.in.ack_count = 0;
1458                 goto set;
1459         } else if (buf_in_between(q->last_move_ftc, bufnr, count)) {
1460                 if (is_qebsm(q)) {
1461                         /* partial overwrite, just update last_move_ftc */
1462                         diff = add_buf(bufnr, count);
1463                         diff = sub_buf(diff, q->last_move_ftc);
1464                         q->u.in.ack_count -= diff;
1465                         if (q->u.in.ack_count <= 0) {
1466                                 q->u.in.polling = 0;
1467                                 q->u.in.ack_count = 0;
1468                                 /* TODO: must we set last_move_ftc to something meaningful? */
1469                                 goto set;
1470                         }
1471                         q->last_move_ftc = add_buf(q->last_move_ftc, diff);
1472                 }
1473                 else
1474                         /* the only ACK will be deleted, so stop polling */
1475                         q->u.in.polling = 0;
1476         }
1477
1478 set:
1479         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1480
1481         used = atomic_add_return(count, &q->nr_buf_used) - count;
1482         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1483
1484         /* no need to signal as long as the adapter had free buffers */
1485         if (used)
1486                 return;
1487
1488         if (need_siga_in(q)) {
1489                 cc = qdio_siga_input(q);
1490                 if (cc)
1491                         q->qdio_error = cc;
1492         }
1493 }
1494
1495 /**
1496  * handle_outbound - process filled outbound buffers
1497  * @q: queue containing the buffers
1498  * @callflags: flags
1499  * @bufnr: first buffer to process
1500  * @count: how many buffers are filled
1501  */
1502 static void handle_outbound(struct qdio_q *q, unsigned int callflags,
1503                             int bufnr, int count)
1504 {
1505         unsigned char state;
1506         int used;
1507
1508         qdio_perf_stat_inc(&perf_stats.outbound_handler);
1509
1510         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1511         used = atomic_add_return(count, &q->nr_buf_used);
1512         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1513
1514         if (callflags & QDIO_FLAG_PCI_OUT)
1515                 q->u.out.pci_out_enabled = 1;
1516         else
1517                 q->u.out.pci_out_enabled = 0;
1518
1519         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1520                 if (multicast_outbound(q))
1521                         qdio_kick_outbound_q(q);
1522                 else
1523                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1524                             (count > 1) &&
1525                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1526                                 /* exploit enhanced SIGA */
1527                                 q->u.out.use_enh_siga = 1;
1528                                 qdio_kick_outbound_q(q);
1529                         } else {
1530                                 /*
1531                                 * One siga-w per buffer required for unicast
1532                                 * HiperSockets.
1533                                 */
1534                                 q->u.out.use_enh_siga = 0;
1535                                 while (count--)
1536                                         qdio_kick_outbound_q(q);
1537                         }
1538
1539                 /* report CC=2 conditions synchronously */
1540                 if (q->qdio_error)
1541                         __qdio_outbound_processing(q);
1542                 goto out;
1543         }
1544
1545         if (need_siga_sync(q)) {
1546                 qdio_siga_sync_q(q);
1547                 goto out;
1548         }
1549
1550         /* try to fast requeue buffers */
1551         get_buf_state(q, prev_buf(bufnr), &state, 0);
1552         if (state != SLSB_CU_OUTPUT_PRIMED)
1553                 qdio_kick_outbound_q(q);
1554         else {
1555                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1556                 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1557         }
1558 out:
1559         /* Fixme: could wait forever if called from process context */
1560         tasklet_schedule(&q->tasklet);
1561 }
1562
1563 /**
1564  * do_QDIO - process input or output buffers
1565  * @cdev: associated ccw_device for the qdio subchannel
1566  * @callflags: input or output and special flags from the program
1567  * @q_nr: queue number
1568  * @bufnr: buffer number
1569  * @count: how many buffers to process
1570  */
1571 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1572             int q_nr, int bufnr, int count)
1573 {
1574         struct qdio_irq *irq_ptr;
1575
1576         if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1577             (count > QDIO_MAX_BUFFERS_PER_Q) ||
1578             (q_nr > QDIO_MAX_QUEUES_PER_IRQ))
1579                 return -EINVAL;
1580
1581         if (!count)
1582                 return 0;
1583
1584         irq_ptr = cdev->private->qdio_data;
1585         if (!irq_ptr)
1586                 return -ENODEV;
1587
1588         if (callflags & QDIO_FLAG_SYNC_INPUT)
1589                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1590         else
1591                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1592         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1593         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1594
1595         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1596                 return -EBUSY;
1597
1598         if (callflags & QDIO_FLAG_SYNC_INPUT)
1599                 handle_inbound(irq_ptr->input_qs[q_nr], callflags, bufnr,
1600                                count);
1601         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1602                 handle_outbound(irq_ptr->output_qs[q_nr], callflags, bufnr,
1603                                 count);
1604         else
1605                 return -EINVAL;
1606         return 0;
1607 }
1608 EXPORT_SYMBOL_GPL(do_QDIO);
1609
1610 static int __init init_QDIO(void)
1611 {
1612         int rc;
1613
1614         rc = qdio_setup_init();
1615         if (rc)
1616                 return rc;
1617         rc = tiqdio_allocate_memory();
1618         if (rc)
1619                 goto out_cache;
1620         rc = qdio_debug_init();
1621         if (rc)
1622                 goto out_ti;
1623         rc = qdio_setup_perf_stats();
1624         if (rc)
1625                 goto out_debug;
1626         rc = tiqdio_register_thinints();
1627         if (rc)
1628                 goto out_perf;
1629         return 0;
1630
1631 out_perf:
1632         qdio_remove_perf_stats();
1633 out_debug:
1634         qdio_debug_exit();
1635 out_ti:
1636         tiqdio_free_memory();
1637 out_cache:
1638         qdio_setup_exit();
1639         return rc;
1640 }
1641
1642 static void __exit exit_QDIO(void)
1643 {
1644         tiqdio_unregister_thinints();
1645         tiqdio_free_memory();
1646         qdio_remove_perf_stats();
1647         qdio_debug_exit();
1648         qdio_setup_exit();
1649 }
1650
1651 module_init(init_QDIO);
1652 module_exit(exit_QDIO);