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 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 235                                 unsigned char *state, int auto_ack)
 236 {
 237         return get_buf_states(q, bufnr, state, 1, auto_ack);
 238 }
 239
 240 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 241 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 242                                  unsigned char state, int count)
 243 {
 244         int i;
 245
 246         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 247         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 248
 249         if (is_qebsm(q))
 250                 return qdio_do_sqbs(q, state, bufnr, count);
 251
 252         for (i = 0; i < count; i++) {
 253                 xchg(&q->slsb.val[bufnr], state);
 254                 bufnr = next_buf(bufnr);
 255         }
 256         return count;
 257 }
 258
 259 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 260                                 unsigned char state)
 261 {
 262         return set_buf_states(q, bufnr, state, 1);
 263 }
 264
 265 /* set slsb states to initial state */
 266 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 267 {
 268         struct qdio_q *q;
 269         int i;
 270
 271         for_each_input_queue(irq_ptr, q, i)
 272                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 273                                QDIO_MAX_BUFFERS_PER_Q);
 274         for_each_output_queue(irq_ptr, q, i)
 275                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 276                                QDIO_MAX_BUFFERS_PER_Q);
 277 }
 278
 279 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 280                           unsigned int input)
 281 {
 282         int cc;
 283
 284         if (!need_siga_sync(q))
 285                 return 0;
 286
 287         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 288         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 static inline int qdio_siga_sync_q(struct qdio_q *q)
 297 {
 298         if (q->is_input_q)
 299                 return qdio_siga_sync(q, 0, q->mask);
 300         else
 301                 return qdio_siga_sync(q, q->mask, 0);
 302 }
 303
 304 static inline int qdio_siga_sync_out(struct qdio_q *q)
 305 {
 306         return qdio_siga_sync(q, ~0U, 0);
 307 }
 308
 309 static inline int qdio_siga_sync_all(struct qdio_q *q)
 310 {
 311         return qdio_siga_sync(q, ~0U, ~0U);
 312 }
 313
 314 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 315 {
 316         unsigned long schid;
 317         unsigned int fc = 0;
 318         u64 start_time = 0;
 319         int cc;
 320
 321         if (q->u.out.use_enh_siga)
 322                 fc = 3;
 323
 324         if (is_qebsm(q)) {
 325                 schid = q->irq_ptr->sch_token;
 326                 fc |= 0x80;
 327         }
 328         else
 329                 schid = *((u32 *)&q->irq_ptr->schid);
 330
 331 again:
 332         cc = do_siga_output(schid, q->mask, busy_bit, fc);
 333
 334         /* hipersocket busy condition */
 335         if (*busy_bit) {
 336                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 337
 338                 if (!start_time) {
 339                         start_time = get_usecs();
 340                         goto again;
 341                 }
 342                 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 343                         goto again;
 344         }
 345         return cc;
 346 }
 347
 348 static inline int qdio_siga_input(struct qdio_q *q)
 349 {
 350         int cc;
 351
 352         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 353         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 static inline void qdio_sync_after_thinint(struct qdio_q *q)
 362 {
 363         if (pci_out_supported(q)) {
 364                 if (need_siga_sync_thinint(q))
 365                         qdio_siga_sync_all(q);
 366                 else if (need_siga_sync_out_thinint(q))
 367                         qdio_siga_sync_out(q);
 368         } else
 369                 qdio_siga_sync_q(q);
 370 }
 371
 372 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 373                         unsigned char *state)
 374 {
 375         qdio_siga_sync_q(q);
 376         return get_buf_states(q, bufnr, state, 1, 0);
 377 }
 378
 379 static inline void qdio_stop_polling(struct qdio_q *q)
 380 {
 381         if (!q->u.in.polling)
 382                 return;
 383
 384         q->u.in.polling = 0;
 385         qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
 386
 387         /* show the card that we are not polling anymore */
 388         if (is_qebsm(q)) {
 389                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 390                                q->u.in.ack_count);
 391                 q->u.in.ack_count = 0;
 392         } else
 393                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 394 }
 395
 396 static void announce_buffer_error(struct qdio_q *q, int count)
 397 {
 398         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 399
 400         /* special handling for no target buffer empty */
 401         if ((!q->is_input_q &&
 402             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 403                 qdio_perf_stat_inc(&perf_stats.outbound_target_full);
 404                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d",
 405                               q->first_to_check);
 406                 return;
 407         }
 408
 409         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 410         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 411         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 412         DBF_ERROR("F14:%2x F15:%2x",
 413                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 414                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 415 }
 416
 417 static inline void inbound_primed(struct qdio_q *q, int count)
 418 {
 419         int new;
 420
 421         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count);
 422
 423         /* for QEBSM the ACK was already set by EQBS */
 424         if (is_qebsm(q)) {
 425                 if (!q->u.in.polling) {
 426                         q->u.in.polling = 1;
 427                         q->u.in.ack_count = count;
 428                         q->u.in.ack_start = q->first_to_check;
 429                         return;
 430                 }
 431
 432                 /* delete the previous ACK's */
 433                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 434                                q->u.in.ack_count);
 435                 q->u.in.ack_count = count;
 436                 q->u.in.ack_start = q->first_to_check;
 437                 return;
 438         }
 439
 440         /*
 441          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 442          * or by the next inbound run.
 443          */
 444         new = add_buf(q->first_to_check, count - 1);
 445         if (q->u.in.polling) {
 446                 /* reset the previous ACK but first set the new one */
 447                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 448                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 449         } else {
 450                 q->u.in.polling = 1;
 451                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 452         }
 453
 454         q->u.in.ack_start = new;
 455         count--;
 456         if (!count)
 457                 return;
 458 }
 459
 460 static int get_inbound_buffer_frontier(struct qdio_q *q)
 461 {
 462         int count, stop;
 463         unsigned char state;
 464
 465         /*
 466          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 467          * would return 0.
 468          */
 469         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 470         stop = add_buf(q->first_to_check, count);
 471
 472         if (q->first_to_check == stop)
 473                 goto out;
 474
 475         /*
 476          * No siga sync here, as a PCI or we after a thin interrupt
 477          * already sync'ed the queues.
 478          */
 479         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 480         if (!count)
 481                 goto out;
 482
 483         switch (state) {
 484         case SLSB_P_INPUT_PRIMED:
 485                 inbound_primed(q, count);
 486                 q->first_to_check = add_buf(q->first_to_check, count);
 487                 atomic_sub(count, &q->nr_buf_used);
 488                 break;
 489         case SLSB_P_INPUT_ERROR:
 490                 announce_buffer_error(q, count);
 491                 /* process the buffer, the upper layer will take care of it */
 492                 q->first_to_check = add_buf(q->first_to_check, count);
 493                 atomic_sub(count, &q->nr_buf_used);
 494                 break;
 495         case SLSB_CU_INPUT_EMPTY:
 496         case SLSB_P_INPUT_NOT_INIT:
 497         case SLSB_P_INPUT_ACK:
 498                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 499                 break;
 500         default:
 501                 BUG();
 502         }
 503 out:
 504         return q->first_to_check;
 505 }
 506
 507 static int qdio_inbound_q_moved(struct qdio_q *q)
 508 {
 509         int bufnr;
 510
 511         bufnr = get_inbound_buffer_frontier(q);
 512
 513         if ((bufnr != q->last_move) || q->qdio_error) {
 514                 q->last_move = bufnr;
 515                 if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
 516                         q->u.in.timestamp = get_usecs();
 517                 return 1;
 518         } else
 519                 return 0;
 520 }
 521
 522 static inline int qdio_inbound_q_done(struct qdio_q *q)
 523 {
 524         unsigned char state = 0;
 525
 526         if (!atomic_read(&q->nr_buf_used))
 527                 return 1;
 528
 529         qdio_siga_sync_q(q);
 530         get_buf_state(q, q->first_to_check, &state, 0);
 531
 532         if (state == SLSB_P_INPUT_PRIMED)
 533                 /* more work coming */
 534                 return 0;
 535
 536         if (is_thinint_irq(q->irq_ptr))
 537                 return 1;
 538
 539         /* don't poll under z/VM */
 540         if (MACHINE_IS_VM)
 541                 return 1;
 542
 543         /*
 544          * At this point we know, that inbound first_to_check
 545          * has (probably) not moved (see qdio_inbound_processing).
 546          */
 547         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 548                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d",
 549                               q->first_to_check);
 550                 return 1;
 551         } else
 552                 return 0;
 553 }
 554
 555 static void qdio_kick_handler(struct qdio_q *q)
 556 {
 557         int start = q->first_to_kick;
 558         int end = q->first_to_check;
 559         int count;
 560
 561         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 562                 return;
 563
 564         count = sub_buf(end, start);
 565
 566         if (q->is_input_q) {
 567                 qdio_perf_stat_inc(&perf_stats.inbound_handler);
 568                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count);
 569         } else {
 570                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: nr:%1d", q->nr);
 571                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count);
 572         }
 573
 574         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 575                    q->irq_ptr->int_parm);
 576
 577         /* for the next time */
 578         q->first_to_kick = end;
 579         q->qdio_error = 0;
 580 }
 581
 582 static void __qdio_inbound_processing(struct qdio_q *q)
 583 {
 584         qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
 585 again:
 586         if (!qdio_inbound_q_moved(q))
 587                 return;
 588
 589         qdio_kick_handler(q);
 590
 591         if (!qdio_inbound_q_done(q))
 592                 /* means poll time is not yet over */
 593                 goto again;
 594
 595         qdio_stop_polling(q);
 596         /*
 597          * We need to check again to not lose initiative after
 598          * resetting the ACK state.
 599          */
 600         if (!qdio_inbound_q_done(q))
 601                 goto again;
 602 }
 603
 604 void qdio_inbound_processing(unsigned long data)
 605 {
 606         struct qdio_q *q = (struct qdio_q *)data;
 607         __qdio_inbound_processing(q);
 608 }
 609
 610 static int get_outbound_buffer_frontier(struct qdio_q *q)
 611 {
 612         int count, stop;
 613         unsigned char state;
 614
 615         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 616             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 617                 qdio_siga_sync_q(q);
 618
 619         /*
 620          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 621          * would return 0.
 622          */
 623         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 624         stop = add_buf(q->first_to_check, count);
 625
 626         if (q->first_to_check == stop)
 627                 return q->first_to_check;
 628
 629         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 630         if (!count)
 631                 return q->first_to_check;
 632
 633         switch (state) {
 634         case SLSB_P_OUTPUT_EMPTY:
 635                 /* the adapter got it */
 636                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count);
 637
 638                 atomic_sub(count, &q->nr_buf_used);
 639                 q->first_to_check = add_buf(q->first_to_check, count);
 640                 break;
 641         case SLSB_P_OUTPUT_ERROR:
 642                 announce_buffer_error(q, count);
 643                 /* process the buffer, the upper layer will take care of it */
 644                 q->first_to_check = add_buf(q->first_to_check, count);
 645                 atomic_sub(count, &q->nr_buf_used);
 646                 break;
 647         case SLSB_CU_OUTPUT_PRIMED:
 648                 /* the adapter has not fetched the output yet */
 649                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 650                 break;
 651         case SLSB_P_OUTPUT_NOT_INIT:
 652         case SLSB_P_OUTPUT_HALTED:
 653                 break;
 654         default:
 655                 BUG();
 656         }
 657         return q->first_to_check;
 658 }
 659
 660 /* all buffers processed? */
 661 static inline int qdio_outbound_q_done(struct qdio_q *q)
 662 {
 663         return atomic_read(&q->nr_buf_used) == 0;
 664 }
 665
 666 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 667 {
 668         int bufnr;
 669
 670         bufnr = get_outbound_buffer_frontier(q);
 671
 672         if ((bufnr != q->last_move) || q->qdio_error) {
 673                 q->last_move = bufnr;
 674                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 675                 return 1;
 676         } else
 677                 return 0;
 678 }
 679
 680 static int qdio_kick_outbound_q(struct qdio_q *q)
 681 {
 682         unsigned int busy_bit;
 683         int cc;
 684
 685         if (!need_siga_out(q))
 686                 return 0;
 687
 688         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 689         qdio_perf_stat_inc(&perf_stats.siga_out);
 690
 691         cc = qdio_siga_output(q, &busy_bit);
 692         switch (cc) {
 693         case 0:
 694                 break;
 695         case 2:
 696                 if (busy_bit) {
 697                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 698                         cc |= QDIO_ERROR_SIGA_BUSY;
 699                 } else
 700                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 701                 break;
 702         case 1:
 703         case 3:
 704                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 705                 break;
 706         }
 707         return cc;
 708 }
 709
 710 static void __qdio_outbound_processing(struct qdio_q *q)
 711 {
 712         qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
 713         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 714
 715         if (qdio_outbound_q_moved(q))
 716                 qdio_kick_handler(q);
 717
 718         if (queue_type(q) == QDIO_ZFCP_QFMT)
 719                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 720                         goto sched;
 721
 722         /* bail out for HiperSockets unicast queues */
 723         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 724                 return;
 725
 726         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 727             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 728                 goto sched;
 729
 730         if (q->u.out.pci_out_enabled)
 731                 return;
 732
 733         /*
 734          * Now we know that queue type is either qeth without pci enabled
 735          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 736          * EMPTY is noticed and outbound_handler is called after some time.
 737          */
 738         if (qdio_outbound_q_done(q))
 739                 del_timer(&q->u.out.timer);
 740         else {
 741                 if (!timer_pending(&q->u.out.timer)) {
 742                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 743                         qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
 744                 }
 745         }
 746         return;
 747
 748 sched:
 749         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 750                 return;
 751         tasklet_schedule(&q->tasklet);
 752 }
 753
 754 /* outbound tasklet */
 755 void qdio_outbound_processing(unsigned long data)
 756 {
 757         struct qdio_q *q = (struct qdio_q *)data;
 758         __qdio_outbound_processing(q);
 759 }
 760
 761 void qdio_outbound_timer(unsigned long data)
 762 {
 763         struct qdio_q *q = (struct qdio_q *)data;
 764
 765         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 766                 return;
 767         tasklet_schedule(&q->tasklet);
 768 }
 769
 770 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 771 {
 772         struct qdio_q *out;
 773         int i;
 774
 775         if (!pci_out_supported(q))
 776                 return;
 777
 778         for_each_output_queue(q->irq_ptr, out, i)
 779                 if (!qdio_outbound_q_done(out))
 780                         tasklet_schedule(&out->tasklet);
 781 }
 782
 783 static void __tiqdio_inbound_processing(struct qdio_q *q)
 784 {
 785         qdio_perf_stat_inc(&perf_stats.thinint_inbound);
 786         qdio_sync_after_thinint(q);
 787
 788         /*
 789          * The interrupt could be caused by a PCI request. Check the
 790          * PCI capable outbound queues.
 791          */
 792         qdio_check_outbound_after_thinint(q);
 793
 794         if (!qdio_inbound_q_moved(q))
 795                 return;
 796
 797         qdio_kick_handler(q);
 798
 799         if (!qdio_inbound_q_done(q)) {
 800                 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop);
 801                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 802                         tasklet_schedule(&q->tasklet);
 803                         return;
 804                 }
 805         }
 806
 807         qdio_stop_polling(q);
 808         /*
 809          * We need to check again to not lose initiative after
 810          * resetting the ACK state.
 811          */
 812         if (!qdio_inbound_q_done(q)) {
 813                 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2);
 814                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 815                         tasklet_schedule(&q->tasklet);
 816         }
 817 }
 818
 819 void tiqdio_inbound_processing(unsigned long data)
 820 {
 821         struct qdio_q *q = (struct qdio_q *)data;
 822         __tiqdio_inbound_processing(q);
 823 }
 824
 825 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 826                                   enum qdio_irq_states state)
 827 {
 828         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 829
 830         irq_ptr->state = state;
 831         mb();
 832 }
 833
 834 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 835 {
 836         if (irb->esw.esw0.erw.cons) {
 837                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 838                 DBF_ERROR_HEX(irb, 64);
 839                 DBF_ERROR_HEX(irb->ecw, 64);
 840         }
 841 }
 842
 843 /* PCI interrupt handler */
 844 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 845 {
 846         int i;
 847         struct qdio_q *q;
 848
 849         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 850                 return;
 851
 852         qdio_perf_stat_inc(&perf_stats.pci_int);
 853
 854         for_each_input_queue(irq_ptr, q, i)
 855                 tasklet_schedule(&q->tasklet);
 856
 857         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 858                 return;
 859
 860         for_each_output_queue(irq_ptr, q, i) {
 861                 if (qdio_outbound_q_done(q))
 862                         continue;
 863
 864                 if (!siga_syncs_out_pci(q))
 865                         qdio_siga_sync_q(q);
 866
 867                 tasklet_schedule(&q->tasklet);
 868         }
 869 }
 870
 871 static void qdio_handle_activate_check(struct ccw_device *cdev,
 872                                 unsigned long intparm, int cstat, int dstat)
 873 {
 874         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 875         struct qdio_q *q;
 876
 877         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 878         DBF_ERROR("intp :%lx", intparm);
 879         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 880
 881         if (irq_ptr->nr_input_qs) {
 882                 q = irq_ptr->input_qs[0];
 883         } else if (irq_ptr->nr_output_qs) {
 884                 q = irq_ptr->output_qs[0];
 885         } else {
 886                 dump_stack();
 887                 goto no_handler;
 888         }
 889         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 890                    0, -1, -1, irq_ptr->int_parm);
 891 no_handler:
 892         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 893 }
 894
 895 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 896                                       int dstat)
 897 {
 898         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 899
 900         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 901
 902         if (cstat)
 903                 goto error;
 904         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 905                 goto error;
 906         if (!(dstat & DEV_STAT_DEV_END))
 907                 goto error;
 908         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 909         return;
 910
 911 error:
 912         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 913         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 914         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 915 }
 916
 917 /* qdio interrupt handler */
 918 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 919                       struct irb *irb)
 920 {
 921         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 922         int cstat, dstat;
 923
 924         qdio_perf_stat_inc(&perf_stats.qdio_int);
 925
 926         if (!intparm || !irq_ptr) {
 927                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 928                 return;
 929         }
 930
 931         if (IS_ERR(irb)) {
 932                 switch (PTR_ERR(irb)) {
 933                 case -EIO:
 934                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 935                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 936                         wake_up(&cdev->private->wait_q);
 937                         return;
 938                 default:
 939                         WARN_ON(1);
 940                         return;
 941                 }
 942         }
 943         qdio_irq_check_sense(irq_ptr, irb);
 944         cstat = irb->scsw.cmd.cstat;
 945         dstat = irb->scsw.cmd.dstat;
 946
 947         switch (irq_ptr->state) {
 948         case QDIO_IRQ_STATE_INACTIVE:
 949                 qdio_establish_handle_irq(cdev, cstat, dstat);
 950                 break;
 951         case QDIO_IRQ_STATE_CLEANUP:
 952                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 953                 break;
 954         case QDIO_IRQ_STATE_ESTABLISHED:
 955         case QDIO_IRQ_STATE_ACTIVE:
 956                 if (cstat & SCHN_STAT_PCI) {
 957                         qdio_int_handler_pci(irq_ptr);
 958                         return;
 959                 }
 960                 if (cstat || dstat)
 961                         qdio_handle_activate_check(cdev, intparm, cstat,
 962                                                    dstat);
 963                 break;
 964         default:
 965                 WARN_ON(1);
 966         }
 967         wake_up(&cdev->private->wait_q);
 968 }
 969
 970 /**
 971  * qdio_get_ssqd_desc - get qdio subchannel description
 972  * @cdev: ccw device to get description for
 973  * @data: where to store the ssqd
 974  *
 975  * Returns 0 or an error code. The results of the chsc are stored in the
 976  * specified structure.
 977  */
 978 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 979                        struct qdio_ssqd_desc *data)
 980 {
 981
 982         if (!cdev || !cdev->private)
 983                 return -EINVAL;
 984
 985         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
 986         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
 987 }
 988 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 989
 990 /**
 991  * qdio_cleanup - shutdown queues and free data structures
 992  * @cdev: associated ccw device
 993  * @how: use halt or clear to shutdown
 994  *
 995  * This function calls qdio_shutdown() for @cdev with method @how.
 996  * and qdio_free(). The qdio_free() return value is ignored since
 997  * !irq_ptr is already checked.
 998  */
 999 int qdio_cleanup(struct ccw_device *cdev, int how)
1000 {
1001         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1002         int rc;
1003
1004         if (!irq_ptr)
1005                 return -ENODEV;
1006
1007         rc = qdio_shutdown(cdev, how);
1008
1009         qdio_free(cdev);
1010         return rc;
1011 }
1012 EXPORT_SYMBOL_GPL(qdio_cleanup);
1013
1014 static void qdio_shutdown_queues(struct ccw_device *cdev)
1015 {
1016         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1017         struct qdio_q *q;
1018         int i;
1019
1020         for_each_input_queue(irq_ptr, q, i)
1021                 tasklet_kill(&q->tasklet);
1022
1023         for_each_output_queue(irq_ptr, q, i) {
1024                 del_timer(&q->u.out.timer);
1025                 tasklet_kill(&q->tasklet);
1026         }
1027 }
1028
1029 /**
1030  * qdio_shutdown - shut down a qdio subchannel
1031  * @cdev: associated ccw device
1032  * @how: use halt or clear to shutdown
1033  */
1034 int qdio_shutdown(struct ccw_device *cdev, int how)
1035 {
1036         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1037         int rc;
1038         unsigned long flags;
1039
1040         if (!irq_ptr)
1041                 return -ENODEV;
1042
1043         BUG_ON(irqs_disabled());
1044         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1045
1046         mutex_lock(&irq_ptr->setup_mutex);
1047         /*
1048          * Subchannel was already shot down. We cannot prevent being called
1049          * twice since cio may trigger a shutdown asynchronously.
1050          */
1051         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1052                 mutex_unlock(&irq_ptr->setup_mutex);
1053                 return 0;
1054         }
1055
1056         /*
1057          * Indicate that the device is going down. Scheduling the queue
1058          * tasklets is forbidden from here on.
1059          */
1060         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1061
1062         tiqdio_remove_input_queues(irq_ptr);
1063         qdio_shutdown_queues(cdev);
1064         qdio_shutdown_debug_entries(irq_ptr, cdev);
1065
1066         /* cleanup subchannel */
1067         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1068
1069         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1070                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1071         else
1072                 /* default behaviour is halt */
1073                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1074         if (rc) {
1075                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1076                 DBF_ERROR("rc:%4d", rc);
1077                 goto no_cleanup;
1078         }
1079
1080         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1081         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1082         wait_event_interruptible_timeout(cdev->private->wait_q,
1083                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1084                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1085                 10 * HZ);
1086         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1087
1088 no_cleanup:
1089         qdio_shutdown_thinint(irq_ptr);
1090
1091         /* restore interrupt handler */
1092         if ((void *)cdev->handler == (void *)qdio_int_handler)
1093                 cdev->handler = irq_ptr->orig_handler;
1094         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1095
1096         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1097         mutex_unlock(&irq_ptr->setup_mutex);
1098         if (rc)
1099                 return rc;
1100         return 0;
1101 }
1102 EXPORT_SYMBOL_GPL(qdio_shutdown);
1103
1104 /**
1105  * qdio_free - free data structures for a qdio subchannel
1106  * @cdev: associated ccw device
1107  */
1108 int qdio_free(struct ccw_device *cdev)
1109 {
1110         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1111
1112         if (!irq_ptr)
1113                 return -ENODEV;
1114
1115         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1116         mutex_lock(&irq_ptr->setup_mutex);
1117
1118         if (irq_ptr->debug_area != NULL) {
1119                 debug_unregister(irq_ptr->debug_area);
1120                 irq_ptr->debug_area = NULL;
1121         }
1122         cdev->private->qdio_data = NULL;
1123         mutex_unlock(&irq_ptr->setup_mutex);
1124
1125         qdio_release_memory(irq_ptr);
1126         return 0;
1127 }
1128 EXPORT_SYMBOL_GPL(qdio_free);
1129
1130 /**
1131  * qdio_initialize - allocate and establish queues for a qdio subchannel
1132  * @init_data: initialization data
1133  *
1134  * This function first allocates queues via qdio_allocate() and on success
1135  * establishes them via qdio_establish().
1136  */
1137 int qdio_initialize(struct qdio_initialize *init_data)
1138 {
1139         int rc;
1140
1141         rc = qdio_allocate(init_data);
1142         if (rc)
1143                 return rc;
1144
1145         rc = qdio_establish(init_data);
1146         if (rc)
1147                 qdio_free(init_data->cdev);
1148         return rc;
1149 }
1150 EXPORT_SYMBOL_GPL(qdio_initialize);
1151
1152 /**
1153  * qdio_allocate - allocate qdio queues and associated data
1154  * @init_data: initialization data
1155  */
1156 int qdio_allocate(struct qdio_initialize *init_data)
1157 {
1158         struct qdio_irq *irq_ptr;
1159
1160         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1161
1162         if ((init_data->no_input_qs && !init_data->input_handler) ||
1163             (init_data->no_output_qs && !init_data->output_handler))
1164                 return -EINVAL;
1165
1166         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1167             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1168                 return -EINVAL;
1169
1170         if ((!init_data->input_sbal_addr_array) ||
1171             (!init_data->output_sbal_addr_array))
1172                 return -EINVAL;
1173
1174         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1175         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1176         if (!irq_ptr)
1177                 goto out_err;
1178
1179         mutex_init(&irq_ptr->setup_mutex);
1180         qdio_allocate_dbf(init_data, irq_ptr);
1181
1182         /*
1183          * Allocate a page for the chsc calls in qdio_establish.
1184          * Must be pre-allocated since a zfcp recovery will call
1185          * qdio_establish. In case of low memory and swap on a zfcp disk
1186          * we may not be able to allocate memory otherwise.
1187          */
1188         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1189         if (!irq_ptr->chsc_page)
1190                 goto out_rel;
1191
1192         /* qdr is used in ccw1.cda which is u32 */
1193         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1194         if (!irq_ptr->qdr)
1195                 goto out_rel;
1196         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1197
1198         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1199                              init_data->no_output_qs))
1200                 goto out_rel;
1201
1202         init_data->cdev->private->qdio_data = irq_ptr;
1203         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1204         return 0;
1205 out_rel:
1206         qdio_release_memory(irq_ptr);
1207 out_err:
1208         return -ENOMEM;
1209 }
1210 EXPORT_SYMBOL_GPL(qdio_allocate);
1211
1212 /**
1213  * qdio_establish - establish queues on a qdio subchannel
1214  * @init_data: initialization data
1215  */
1216 int qdio_establish(struct qdio_initialize *init_data)
1217 {
1218         struct qdio_irq *irq_ptr;
1219         struct ccw_device *cdev = init_data->cdev;
1220         unsigned long saveflags;
1221         int rc;
1222
1223         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1224
1225         irq_ptr = cdev->private->qdio_data;
1226         if (!irq_ptr)
1227                 return -ENODEV;
1228
1229         if (cdev->private->state != DEV_STATE_ONLINE)
1230                 return -EINVAL;
1231
1232         mutex_lock(&irq_ptr->setup_mutex);
1233         qdio_setup_irq(init_data);
1234
1235         rc = qdio_establish_thinint(irq_ptr);
1236         if (rc) {
1237                 mutex_unlock(&irq_ptr->setup_mutex);
1238                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1239                 return rc;
1240         }
1241
1242         /* establish q */
1243         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1244         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1245         irq_ptr->ccw.count = irq_ptr->equeue.count;
1246         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1247
1248         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1249         ccw_device_set_options_mask(cdev, 0);
1250
1251         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1252         if (rc) {
1253                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1254                 DBF_ERROR("rc:%4x", rc);
1255         }
1256         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1257
1258         if (rc) {
1259                 mutex_unlock(&irq_ptr->setup_mutex);
1260                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1261                 return rc;
1262         }
1263
1264         wait_event_interruptible_timeout(cdev->private->wait_q,
1265                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1266                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1267
1268         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1269                 mutex_unlock(&irq_ptr->setup_mutex);
1270                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1271                 return -EIO;
1272         }
1273
1274         qdio_setup_ssqd_info(irq_ptr);
1275         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1276         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1277
1278         /* qebsm is now setup if available, initialize buffer states */
1279         qdio_init_buf_states(irq_ptr);
1280
1281         mutex_unlock(&irq_ptr->setup_mutex);
1282         qdio_print_subchannel_info(irq_ptr, cdev);
1283         qdio_setup_debug_entries(irq_ptr, cdev);
1284         return 0;
1285 }
1286 EXPORT_SYMBOL_GPL(qdio_establish);
1287
1288 /**
1289  * qdio_activate - activate queues on a qdio subchannel
1290  * @cdev: associated cdev
1291  */
1292 int qdio_activate(struct ccw_device *cdev)
1293 {
1294         struct qdio_irq *irq_ptr;
1295         int rc;
1296         unsigned long saveflags;
1297
1298         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1299
1300         irq_ptr = cdev->private->qdio_data;
1301         if (!irq_ptr)
1302                 return -ENODEV;
1303
1304         if (cdev->private->state != DEV_STATE_ONLINE)
1305                 return -EINVAL;
1306
1307         mutex_lock(&irq_ptr->setup_mutex);
1308         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1309                 rc = -EBUSY;
1310                 goto out;
1311         }
1312
1313         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1314         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1315         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1316         irq_ptr->ccw.cda = 0;
1317
1318         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1319         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1320
1321         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1322                               0, DOIO_DENY_PREFETCH);
1323         if (rc) {
1324                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1325                 DBF_ERROR("rc:%4x", rc);
1326         }
1327         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1328
1329         if (rc)
1330                 goto out;
1331
1332         if (is_thinint_irq(irq_ptr))
1333                 tiqdio_add_input_queues(irq_ptr);
1334
1335         /* wait for subchannel to become active */
1336         msleep(5);
1337
1338         switch (irq_ptr->state) {
1339         case QDIO_IRQ_STATE_STOPPED:
1340         case QDIO_IRQ_STATE_ERR:
1341                 rc = -EIO;
1342                 break;
1343         default:
1344                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1345                 rc = 0;
1346         }
1347 out:
1348         mutex_unlock(&irq_ptr->setup_mutex);
1349         return rc;
1350 }
1351 EXPORT_SYMBOL_GPL(qdio_activate);
1352
1353 static inline int buf_in_between(int bufnr, int start, int count)
1354 {
1355         int end = add_buf(start, count);
1356
1357         if (end > start) {
1358                 if (bufnr >= start && bufnr < end)
1359                         return 1;
1360                 else
1361                         return 0;
1362         }
1363
1364         /* wrap-around case */
1365         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1366             (bufnr < end))
1367                 return 1;
1368         else
1369                 return 0;
1370 }
1371
1372 /**
1373  * handle_inbound - reset processed input buffers
1374  * @q: queue containing the buffers
1375  * @callflags: flags
1376  * @bufnr: first buffer to process
1377  * @count: how many buffers are emptied
1378  */
1379 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1380                           int bufnr, int count)
1381 {
1382         int used, diff;
1383
1384         if (!q->u.in.polling)
1385                 goto set;
1386
1387         /* protect against stop polling setting an ACK for an emptied slsb */
1388         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1389                 /* overwriting everything, just delete polling status */
1390                 q->u.in.polling = 0;
1391                 q->u.in.ack_count = 0;
1392                 goto set;
1393         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1394                 if (is_qebsm(q)) {
1395                         /* partial overwrite, just update ack_start */
1396                         diff = add_buf(bufnr, count);
1397                         diff = sub_buf(diff, q->u.in.ack_start);
1398                         q->u.in.ack_count -= diff;
1399                         if (q->u.in.ack_count <= 0) {
1400                                 q->u.in.polling = 0;
1401                                 q->u.in.ack_count = 0;
1402                                 goto set;
1403                         }
1404                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1405                 }
1406                 else
1407                         /* the only ACK will be deleted, so stop polling */
1408                         q->u.in.polling = 0;
1409         }
1410
1411 set:
1412         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1413
1414         used = atomic_add_return(count, &q->nr_buf_used) - count;
1415         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1416
1417         /* no need to signal as long as the adapter had free buffers */
1418         if (used)
1419                 return 0;
1420
1421         if (need_siga_in(q))
1422                 return qdio_siga_input(q);
1423         return 0;
1424 }
1425
1426 /**
1427  * handle_outbound - process filled outbound buffers
1428  * @q: queue containing the buffers
1429  * @callflags: flags
1430  * @bufnr: first buffer to process
1431  * @count: how many buffers are filled
1432  */
1433 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1434                            int bufnr, int count)
1435 {
1436         unsigned char state;
1437         int used, rc = 0;
1438
1439         qdio_perf_stat_inc(&perf_stats.outbound_handler);
1440
1441         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1442         used = atomic_add_return(count, &q->nr_buf_used);
1443         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1444
1445         if (callflags & QDIO_FLAG_PCI_OUT)
1446                 q->u.out.pci_out_enabled = 1;
1447         else
1448                 q->u.out.pci_out_enabled = 0;
1449
1450         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1451                 if (multicast_outbound(q))
1452                         rc = qdio_kick_outbound_q(q);
1453                 else
1454                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1455                             (count > 1) &&
1456                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1457                                 /* exploit enhanced SIGA */
1458                                 q->u.out.use_enh_siga = 1;
1459                                 rc = qdio_kick_outbound_q(q);
1460                         } else {
1461                                 /*
1462                                 * One siga-w per buffer required for unicast
1463                                 * HiperSockets.
1464                                 */
1465                                 q->u.out.use_enh_siga = 0;
1466                                 while (count--) {
1467                                         rc = qdio_kick_outbound_q(q);
1468                                         if (rc)
1469                                                 goto out;
1470                                 }
1471                         }
1472                 goto out;
1473         }
1474
1475         if (need_siga_sync(q)) {
1476                 qdio_siga_sync_q(q);
1477                 goto out;
1478         }
1479
1480         /* try to fast requeue buffers */
1481         get_buf_state(q, prev_buf(bufnr), &state, 0);
1482         if (state != SLSB_CU_OUTPUT_PRIMED)
1483                 rc = qdio_kick_outbound_q(q);
1484         else {
1485                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1486                 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1487         }
1488 out:
1489         tasklet_schedule(&q->tasklet);
1490         return rc;
1491 }
1492
1493 /**
1494  * do_QDIO - process input or output buffers
1495  * @cdev: associated ccw_device for the qdio subchannel
1496  * @callflags: input or output and special flags from the program
1497  * @q_nr: queue number
1498  * @bufnr: buffer number
1499  * @count: how many buffers to process
1500  */
1501 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1502             int q_nr, unsigned int bufnr, unsigned int count)
1503 {
1504         struct qdio_irq *irq_ptr;
1505
1506         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1507                 return -EINVAL;
1508
1509         irq_ptr = cdev->private->qdio_data;
1510         if (!irq_ptr)
1511                 return -ENODEV;
1512
1513         if (callflags & QDIO_FLAG_SYNC_INPUT)
1514                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1515         else
1516                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1517         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1518         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1519
1520         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1521                 return -EBUSY;
1522
1523         if (callflags & QDIO_FLAG_SYNC_INPUT)
1524                 return handle_inbound(irq_ptr->input_qs[q_nr],
1525                                       callflags, bufnr, count);
1526         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1527                 return handle_outbound(irq_ptr->output_qs[q_nr],
1528                                        callflags, bufnr, count);
1529         return -EINVAL;
1530 }
1531 EXPORT_SYMBOL_GPL(do_QDIO);
1532
1533 static int __init init_QDIO(void)
1534 {
1535         int rc;
1536
1537         rc = qdio_setup_init();
1538         if (rc)
1539                 return rc;
1540         rc = tiqdio_allocate_memory();
1541         if (rc)
1542                 goto out_cache;
1543         rc = qdio_debug_init();
1544         if (rc)
1545                 goto out_ti;
1546         rc = qdio_setup_perf_stats();
1547         if (rc)
1548                 goto out_debug;
1549         rc = tiqdio_register_thinints();
1550         if (rc)
1551                 goto out_perf;
1552         return 0;
1553
1554 out_perf:
1555         qdio_remove_perf_stats();
1556 out_debug:
1557         qdio_debug_exit();
1558 out_ti:
1559         tiqdio_free_memory();
1560 out_cache:
1561         qdio_setup_exit();
1562         return rc;
1563 }
1564
1565 static void __exit exit_QDIO(void)
1566 {
1567         tiqdio_unregister_thinints();
1568         tiqdio_free_memory();
1569         qdio_remove_perf_stats();
1570         qdio_debug_exit();
1571         qdio_setup_exit();
1572 }
1573
1574 module_init(init_QDIO);
1575 module_exit(exit_QDIO);