drivers/s390/cio/qdio_main.c

   1 /*
   2  * linux/drivers/s390/cio/qdio_main.c
   3  *
   4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   5  *
   6  * Copyright 2000,2008 IBM Corp.
   7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   8  *            Jan Glauber <jang@linux.vnet.ibm.com>
   9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include <linux/gfp.h>
  17 #include <linux/kernel_stat.h>
  18 #include <linux/atomic.h>
  19 #include <asm/debug.h>
  20 #include <asm/qdio.h>
  21
  22 #include "cio.h"
  23 #include "css.h"
  24 #include "device.h"
  25 #include "qdio.h"
  26 #include "qdio_debug.h"
  27
  28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  29         "Jan Glauber <jang@linux.vnet.ibm.com>");
  30 MODULE_DESCRIPTION("QDIO base support");
  31 MODULE_LICENSE("GPL");
  32
  33 static inline int do_siga_sync(unsigned long schid,
  34                                unsigned int out_mask, unsigned int in_mask,
  35                                unsigned int fc)
  36 {
  37         register unsigned long __fc asm ("0") = fc;
  38         register unsigned long __schid asm ("1") = schid;
  39         register unsigned long out asm ("2") = out_mask;
  40         register unsigned long in asm ("3") = in_mask;
  41         int cc;
  42
  43         asm volatile(
  44                 "       siga    0\n"
  45                 "       ipm     %0\n"
  46                 "       srl     %0,28\n"
  47                 : "=d" (cc)
  48                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  49         return cc;
  50 }
  51
  52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  53                                 unsigned int fc)
  54 {
  55         register unsigned long __fc asm ("0") = fc;
  56         register unsigned long __schid asm ("1") = schid;
  57         register unsigned long __mask asm ("2") = mask;
  58         int cc;
  59
  60         asm volatile(
  61                 "       siga    0\n"
  62                 "       ipm     %0\n"
  63                 "       srl     %0,28\n"
  64                 : "=d" (cc)
  65                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  66         return cc;
  67 }
  68
  69 /**
  70  * do_siga_output - perform SIGA-w/wt function
  71  * @schid: subchannel id or in case of QEBSM the subchannel token
  72  * @mask: which output queues to process
  73  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  74  * @fc: function code to perform
  75  *
  76  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
  77  * Note: For IQDC unicast queues only the highest priority queue is processed.
  78  */
  79 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  80                                  unsigned int *bb, unsigned int fc)
  81 {
  82         register unsigned long __fc asm("0") = fc;
  83         register unsigned long __schid asm("1") = schid;
  84         register unsigned long __mask asm("2") = mask;
  85         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  86
  87         asm volatile(
  88                 "       siga    0\n"
  89                 "0:     ipm     %0\n"
  90                 "       srl     %0,28\n"
  91                 "1:\n"
  92                 EX_TABLE(0b, 1b)
  93                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
  94                 : : "cc", "memory");
  95         *bb = ((unsigned int) __fc) >> 31;
  96         return cc;
  97 }
  98
  99 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
 100 {
 101         /* all done or next buffer state different */
 102         if (ccq == 0 || ccq == 32)
 103                 return 0;
 104         /* not all buffers processed */
 105         if (ccq == 96 || ccq == 97)
 106                 return 1;
 107         /* notify devices immediately */
 108         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 109         return -EIO;
 110 }
 111
 112 /**
 113  * qdio_do_eqbs - extract buffer states for QEBSM
 114  * @q: queue to manipulate
 115  * @state: state of the extracted buffers
 116  * @start: buffer number to start at
 117  * @count: count of buffers to examine
 118  * @auto_ack: automatically acknowledge buffers
 119  *
 120  * Returns the number of successfully extracted equal buffer states.
 121  * Stops processing if a state is different from the last buffers state.
 122  */
 123 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 124                         int start, int count, int auto_ack)
 125 {
 126         unsigned int ccq = 0;
 127         int tmp_count = count, tmp_start = start;
 128         int nr = q->nr;
 129         int rc;
 130
 131         BUG_ON(!q->irq_ptr->sch_token);
 132         qperf_inc(q, eqbs);
 133
 134         if (!q->is_input_q)
 135                 nr += q->irq_ptr->nr_input_qs;
 136 again:
 137         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 138                       auto_ack);
 139         rc = qdio_check_ccq(q, ccq);
 140
 141         /* At least one buffer was processed, return and extract the remaining
 142          * buffers later.
 143          */
 144         if ((ccq == 96) && (count != tmp_count)) {
 145                 qperf_inc(q, eqbs_partial);
 146                 return (count - tmp_count);
 147         }
 148
 149         if (rc == 1) {
 150                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 151                 goto again;
 152         }
 153
 154         if (rc < 0) {
 155                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 156                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 157                 q->handler(q->irq_ptr->cdev,
 158                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 159                            0, -1, -1, q->irq_ptr->int_parm);
 160                 return 0;
 161         }
 162         return count - tmp_count;
 163 }
 164
 165 /**
 166  * qdio_do_sqbs - set buffer states for QEBSM
 167  * @q: queue to manipulate
 168  * @state: new state of the buffers
 169  * @start: first buffer number to change
 170  * @count: how many buffers to change
 171  *
 172  * Returns the number of successfully changed buffers.
 173  * Does retrying until the specified count of buffer states is set or an
 174  * error occurs.
 175  */
 176 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 177                         int count)
 178 {
 179         unsigned int ccq = 0;
 180         int tmp_count = count, tmp_start = start;
 181         int nr = q->nr;
 182         int rc;
 183
 184         if (!count)
 185                 return 0;
 186
 187         BUG_ON(!q->irq_ptr->sch_token);
 188         qperf_inc(q, sqbs);
 189
 190         if (!q->is_input_q)
 191                 nr += q->irq_ptr->nr_input_qs;
 192 again:
 193         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 194         rc = qdio_check_ccq(q, ccq);
 195         if (rc == 1) {
 196                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 197                 qperf_inc(q, sqbs_partial);
 198                 goto again;
 199         }
 200         if (rc < 0) {
 201                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 202                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 203                 q->handler(q->irq_ptr->cdev,
 204                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 205                            0, -1, -1, q->irq_ptr->int_parm);
 206                 return 0;
 207         }
 208         WARN_ON(tmp_count);
 209         return count - tmp_count;
 210 }
 211
 212 /* returns number of examined buffers and their common state in *state */
 213 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 214                                  unsigned char *state, unsigned int count,
 215                                  int auto_ack)
 216 {
 217         unsigned char __state = 0;
 218         int i;
 219
 220         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 221         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 222
 223         if (is_qebsm(q))
 224                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 225
 226         for (i = 0; i < count; i++) {
 227                 if (!__state)
 228                         __state = q->slsb.val[bufnr];
 229                 else if (q->slsb.val[bufnr] != __state)
 230                         break;
 231                 bufnr = next_buf(bufnr);
 232         }
 233         *state = __state;
 234         return i;
 235 }
 236
 237 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 238                                 unsigned char *state, int auto_ack)
 239 {
 240         return get_buf_states(q, bufnr, state, 1, auto_ack);
 241 }
 242
 243 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 244 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 245                                  unsigned char state, int count)
 246 {
 247         int i;
 248
 249         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 250         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 251
 252         if (is_qebsm(q))
 253                 return qdio_do_sqbs(q, state, bufnr, count);
 254
 255         for (i = 0; i < count; i++) {
 256                 xchg(&q->slsb.val[bufnr], state);
 257                 bufnr = next_buf(bufnr);
 258         }
 259         return count;
 260 }
 261
 262 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 263                                 unsigned char state)
 264 {
 265         return set_buf_states(q, bufnr, state, 1);
 266 }
 267
 268 /* set slsb states to initial state */
 269 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 270 {
 271         struct qdio_q *q;
 272         int i;
 273
 274         for_each_input_queue(irq_ptr, q, i)
 275                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 276                                QDIO_MAX_BUFFERS_PER_Q);
 277         for_each_output_queue(irq_ptr, q, i)
 278                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 279                                QDIO_MAX_BUFFERS_PER_Q);
 280 }
 281
 282 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 283                           unsigned int input)
 284 {
 285         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 286         unsigned int fc = QDIO_SIGA_SYNC;
 287         int cc;
 288
 289         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 290         qperf_inc(q, siga_sync);
 291
 292         if (is_qebsm(q)) {
 293                 schid = q->irq_ptr->sch_token;
 294                 fc |= QDIO_SIGA_QEBSM_FLAG;
 295         }
 296
 297         cc = do_siga_sync(schid, output, input, fc);
 298         if (unlikely(cc))
 299                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 300         return cc;
 301 }
 302
 303 static inline int qdio_siga_sync_q(struct qdio_q *q)
 304 {
 305         if (q->is_input_q)
 306                 return qdio_siga_sync(q, 0, q->mask);
 307         else
 308                 return qdio_siga_sync(q, q->mask, 0);
 309 }
 310
 311 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 312 {
 313         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 314         unsigned int fc = QDIO_SIGA_WRITE;
 315         u64 start_time = 0;
 316         int cc;
 317
 318         if (is_qebsm(q)) {
 319                 schid = q->irq_ptr->sch_token;
 320                 fc |= QDIO_SIGA_QEBSM_FLAG;
 321         }
 322 again:
 323         cc = do_siga_output(schid, q->mask, busy_bit, fc);
 324
 325         /* hipersocket busy condition */
 326         if (unlikely(*busy_bit)) {
 327                 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
 328
 329                 if (!start_time) {
 330                         start_time = get_clock();
 331                         goto again;
 332                 }
 333                 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 334                         goto again;
 335         }
 336         return cc;
 337 }
 338
 339 static inline int qdio_siga_input(struct qdio_q *q)
 340 {
 341         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 342         unsigned int fc = QDIO_SIGA_READ;
 343         int cc;
 344
 345         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 346         qperf_inc(q, siga_read);
 347
 348         if (is_qebsm(q)) {
 349                 schid = q->irq_ptr->sch_token;
 350                 fc |= QDIO_SIGA_QEBSM_FLAG;
 351         }
 352
 353         cc = do_siga_input(schid, q->mask, fc);
 354         if (unlikely(cc))
 355                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 356         return cc;
 357 }
 358
 359 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 360 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 361
 362 static inline void qdio_sync_queues(struct qdio_q *q)
 363 {
 364         /* PCI capable outbound queues will also be scanned so sync them too */
 365         if (pci_out_supported(q))
 366                 qdio_siga_sync_all(q);
 367         else
 368                 qdio_siga_sync_q(q);
 369 }
 370
 371 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 372                         unsigned char *state)
 373 {
 374         if (need_siga_sync(q))
 375                 qdio_siga_sync_q(q);
 376         return get_buf_states(q, bufnr, state, 1, 0);
 377 }
 378
 379 static inline void qdio_stop_polling(struct qdio_q *q)
 380 {
 381         if (!q->u.in.polling)
 382                 return;
 383
 384         q->u.in.polling = 0;
 385         qperf_inc(q, stop_polling);
 386
 387         /* show the card that we are not polling anymore */
 388         if (is_qebsm(q)) {
 389                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 390                                q->u.in.ack_count);
 391                 q->u.in.ack_count = 0;
 392         } else
 393                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 394 }
 395
 396 static inline void account_sbals(struct qdio_q *q, int count)
 397 {
 398         int pos = 0;
 399
 400         q->q_stats.nr_sbal_total += count;
 401         if (count == QDIO_MAX_BUFFERS_MASK) {
 402                 q->q_stats.nr_sbals[7]++;
 403                 return;
 404         }
 405         while (count >>= 1)
 406                 pos++;
 407         q->q_stats.nr_sbals[pos]++;
 408 }
 409
 410 static void process_buffer_error(struct qdio_q *q, int count)
 411 {
 412         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 413                                         SLSB_P_OUTPUT_NOT_INIT;
 414
 415         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 416
 417         /* special handling for no target buffer empty */
 418         if ((!q->is_input_q &&
 419             (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
 420                 qperf_inc(q, target_full);
 421                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 422                               q->first_to_check);
 423                 return;
 424         }
 425
 426         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 427         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 428         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 429         DBF_ERROR("F14:%2x F15:%2x",
 430                   q->sbal[q->first_to_check]->element[14].sflags,
 431                   q->sbal[q->first_to_check]->element[15].sflags);
 432
 433         /*
 434          * Interrupts may be avoided as long as the error is present
 435          * so change the buffer state immediately to avoid starvation.
 436          */
 437         set_buf_states(q, q->first_to_check, state, count);
 438 }
 439
 440 static inline void inbound_primed(struct qdio_q *q, int count)
 441 {
 442         int new;
 443
 444         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 445
 446         /* for QEBSM the ACK was already set by EQBS */
 447         if (is_qebsm(q)) {
 448                 if (!q->u.in.polling) {
 449                         q->u.in.polling = 1;
 450                         q->u.in.ack_count = count;
 451                         q->u.in.ack_start = q->first_to_check;
 452                         return;
 453                 }
 454
 455                 /* delete the previous ACK's */
 456                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 457                                q->u.in.ack_count);
 458                 q->u.in.ack_count = count;
 459                 q->u.in.ack_start = q->first_to_check;
 460                 return;
 461         }
 462
 463         /*
 464          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 465          * or by the next inbound run.
 466          */
 467         new = add_buf(q->first_to_check, count - 1);
 468         if (q->u.in.polling) {
 469                 /* reset the previous ACK but first set the new one */
 470                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 471                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 472         } else {
 473                 q->u.in.polling = 1;
 474                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 475         }
 476
 477         q->u.in.ack_start = new;
 478         count--;
 479         if (!count)
 480                 return;
 481         /* need to change ALL buffers to get more interrupts */
 482         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 483 }
 484
 485 static int get_inbound_buffer_frontier(struct qdio_q *q)
 486 {
 487         int count, stop;
 488         unsigned char state = 0;
 489
 490         /*
 491          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 492          * would return 0.
 493          */
 494         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 495         stop = add_buf(q->first_to_check, count);
 496
 497         if (q->first_to_check == stop)
 498                 goto out;
 499
 500         /*
 501          * No siga sync here, as a PCI or we after a thin interrupt
 502          * already sync'ed the queues.
 503          */
 504         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 505         if (!count)
 506                 goto out;
 507
 508         switch (state) {
 509         case SLSB_P_INPUT_PRIMED:
 510                 inbound_primed(q, count);
 511                 q->first_to_check = add_buf(q->first_to_check, count);
 512                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 513                         qperf_inc(q, inbound_queue_full);
 514                 if (q->irq_ptr->perf_stat_enabled)
 515                         account_sbals(q, count);
 516                 break;
 517         case SLSB_P_INPUT_ERROR:
 518                 process_buffer_error(q, count);
 519                 q->first_to_check = add_buf(q->first_to_check, count);
 520                 atomic_sub(count, &q->nr_buf_used);
 521                 if (q->irq_ptr->perf_stat_enabled)
 522                         account_sbals_error(q, count);
 523                 break;
 524         case SLSB_CU_INPUT_EMPTY:
 525         case SLSB_P_INPUT_NOT_INIT:
 526         case SLSB_P_INPUT_ACK:
 527                 if (q->irq_ptr->perf_stat_enabled)
 528                         q->q_stats.nr_sbal_nop++;
 529                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 530                 break;
 531         default:
 532                 BUG();
 533         }
 534 out:
 535         return q->first_to_check;
 536 }
 537
 538 static int qdio_inbound_q_moved(struct qdio_q *q)
 539 {
 540         int bufnr;
 541
 542         bufnr = get_inbound_buffer_frontier(q);
 543
 544         if ((bufnr != q->last_move) || q->qdio_error) {
 545                 q->last_move = bufnr;
 546                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 547                         q->u.in.timestamp = get_clock();
 548                 return 1;
 549         } else
 550                 return 0;
 551 }
 552
 553 static inline int qdio_inbound_q_done(struct qdio_q *q)
 554 {
 555         unsigned char state = 0;
 556
 557         if (!atomic_read(&q->nr_buf_used))
 558                 return 1;
 559
 560         if (need_siga_sync(q))
 561                 qdio_siga_sync_q(q);
 562         get_buf_state(q, q->first_to_check, &state, 0);
 563
 564         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 565                 /* more work coming */
 566                 return 0;
 567
 568         if (is_thinint_irq(q->irq_ptr))
 569                 return 1;
 570
 571         /* don't poll under z/VM */
 572         if (MACHINE_IS_VM)
 573                 return 1;
 574
 575         /*
 576          * At this point we know, that inbound first_to_check
 577          * has (probably) not moved (see qdio_inbound_processing).
 578          */
 579         if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 580                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 581                               q->first_to_check);
 582                 return 1;
 583         } else
 584                 return 0;
 585 }
 586
 587 static void qdio_kick_handler(struct qdio_q *q)
 588 {
 589         int start = q->first_to_kick;
 590         int end = q->first_to_check;
 591         int count;
 592
 593         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 594                 return;
 595
 596         count = sub_buf(end, start);
 597
 598         if (q->is_input_q) {
 599                 qperf_inc(q, inbound_handler);
 600                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 601         } else {
 602                 qperf_inc(q, outbound_handler);
 603                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 604                               start, count);
 605         }
 606
 607         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 608                    q->irq_ptr->int_parm);
 609
 610         /* for the next time */
 611         q->first_to_kick = end;
 612         q->qdio_error = 0;
 613 }
 614
 615 static void __qdio_inbound_processing(struct qdio_q *q)
 616 {
 617         qperf_inc(q, tasklet_inbound);
 618
 619         if (!qdio_inbound_q_moved(q))
 620                 return;
 621
 622         qdio_kick_handler(q);
 623
 624         if (!qdio_inbound_q_done(q)) {
 625                 /* means poll time is not yet over */
 626                 qperf_inc(q, tasklet_inbound_resched);
 627                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 628                         tasklet_schedule(&q->tasklet);
 629                         return;
 630                 }
 631         }
 632
 633         qdio_stop_polling(q);
 634         /*
 635          * We need to check again to not lose initiative after
 636          * resetting the ACK state.
 637          */
 638         if (!qdio_inbound_q_done(q)) {
 639                 qperf_inc(q, tasklet_inbound_resched2);
 640                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 641                         tasklet_schedule(&q->tasklet);
 642         }
 643 }
 644
 645 void qdio_inbound_processing(unsigned long data)
 646 {
 647         struct qdio_q *q = (struct qdio_q *)data;
 648         __qdio_inbound_processing(q);
 649 }
 650
 651 static int get_outbound_buffer_frontier(struct qdio_q *q)
 652 {
 653         int count, stop;
 654         unsigned char state = 0;
 655
 656         if (need_siga_sync(q))
 657                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 658                     !pci_out_supported(q)) ||
 659                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 660                     multicast_outbound(q)))
 661                         qdio_siga_sync_q(q);
 662
 663         /*
 664          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 665          * would return 0.
 666          */
 667         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 668         stop = add_buf(q->first_to_check, count);
 669
 670         if (q->first_to_check == stop)
 671                 return q->first_to_check;
 672
 673         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 674         if (!count)
 675                 return q->first_to_check;
 676
 677         switch (state) {
 678         case SLSB_P_OUTPUT_EMPTY:
 679                 /* the adapter got it */
 680                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
 681
 682                 atomic_sub(count, &q->nr_buf_used);
 683                 q->first_to_check = add_buf(q->first_to_check, count);
 684                 if (q->irq_ptr->perf_stat_enabled)
 685                         account_sbals(q, count);
 686                 break;
 687         case SLSB_P_OUTPUT_ERROR:
 688                 process_buffer_error(q, count);
 689                 q->first_to_check = add_buf(q->first_to_check, count);
 690                 atomic_sub(count, &q->nr_buf_used);
 691                 if (q->irq_ptr->perf_stat_enabled)
 692                         account_sbals_error(q, count);
 693                 break;
 694         case SLSB_CU_OUTPUT_PRIMED:
 695                 /* the adapter has not fetched the output yet */
 696                 if (q->irq_ptr->perf_stat_enabled)
 697                         q->q_stats.nr_sbal_nop++;
 698                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 699                 break;
 700         case SLSB_P_OUTPUT_NOT_INIT:
 701         case SLSB_P_OUTPUT_HALTED:
 702                 break;
 703         default:
 704                 BUG();
 705         }
 706         return q->first_to_check;
 707 }
 708
 709 /* all buffers processed? */
 710 static inline int qdio_outbound_q_done(struct qdio_q *q)
 711 {
 712         return atomic_read(&q->nr_buf_used) == 0;
 713 }
 714
 715 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 716 {
 717         int bufnr;
 718
 719         bufnr = get_outbound_buffer_frontier(q);
 720
 721         if ((bufnr != q->last_move) || q->qdio_error) {
 722                 q->last_move = bufnr;
 723                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 724                 return 1;
 725         } else
 726                 return 0;
 727 }
 728
 729 static int qdio_kick_outbound_q(struct qdio_q *q)
 730 {
 731         unsigned int busy_bit;
 732         int cc;
 733
 734         if (!need_siga_out(q))
 735                 return 0;
 736
 737         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 738         qperf_inc(q, siga_write);
 739
 740         cc = qdio_siga_output(q, &busy_bit);
 741         switch (cc) {
 742         case 0:
 743                 break;
 744         case 2:
 745                 if (busy_bit) {
 746                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 747                         cc |= QDIO_ERROR_SIGA_BUSY;
 748                 } else
 749                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 750                 break;
 751         case 1:
 752         case 3:
 753                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 754                 break;
 755         }
 756         return cc;
 757 }
 758
 759 static void __qdio_outbound_processing(struct qdio_q *q)
 760 {
 761         qperf_inc(q, tasklet_outbound);
 762         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 763
 764         if (qdio_outbound_q_moved(q))
 765                 qdio_kick_handler(q);
 766
 767         if (queue_type(q) == QDIO_ZFCP_QFMT)
 768                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 769                         goto sched;
 770
 771         /* bail out for HiperSockets unicast queues */
 772         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 773                 return;
 774
 775         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 776             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 777                 goto sched;
 778
 779         if (q->u.out.pci_out_enabled)
 780                 return;
 781
 782         /*
 783          * Now we know that queue type is either qeth without pci enabled
 784          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 785          * EMPTY is noticed and outbound_handler is called after some time.
 786          */
 787         if (qdio_outbound_q_done(q))
 788                 del_timer(&q->u.out.timer);
 789         else
 790                 if (!timer_pending(&q->u.out.timer))
 791                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 792         return;
 793
 794 sched:
 795         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 796                 return;
 797         tasklet_schedule(&q->tasklet);
 798 }
 799
 800 /* outbound tasklet */
 801 void qdio_outbound_processing(unsigned long data)
 802 {
 803         struct qdio_q *q = (struct qdio_q *)data;
 804         __qdio_outbound_processing(q);
 805 }
 806
 807 void qdio_outbound_timer(unsigned long data)
 808 {
 809         struct qdio_q *q = (struct qdio_q *)data;
 810
 811         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 812                 return;
 813         tasklet_schedule(&q->tasklet);
 814 }
 815
 816 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 817 {
 818         struct qdio_q *out;
 819         int i;
 820
 821         if (!pci_out_supported(q))
 822                 return;
 823
 824         for_each_output_queue(q->irq_ptr, out, i)
 825                 if (!qdio_outbound_q_done(out))
 826                         tasklet_schedule(&out->tasklet);
 827 }
 828
 829 static void __tiqdio_inbound_processing(struct qdio_q *q)
 830 {
 831         qperf_inc(q, tasklet_inbound);
 832         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 833                 qdio_sync_queues(q);
 834
 835         /*
 836          * The interrupt could be caused by a PCI request. Check the
 837          * PCI capable outbound queues.
 838          */
 839         qdio_check_outbound_after_thinint(q);
 840
 841         if (!qdio_inbound_q_moved(q))
 842                 return;
 843
 844         qdio_kick_handler(q);
 845
 846         if (!qdio_inbound_q_done(q)) {
 847                 qperf_inc(q, tasklet_inbound_resched);
 848                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 849                         tasklet_schedule(&q->tasklet);
 850                         return;
 851                 }
 852         }
 853
 854         qdio_stop_polling(q);
 855         /*
 856          * We need to check again to not lose initiative after
 857          * resetting the ACK state.
 858          */
 859         if (!qdio_inbound_q_done(q)) {
 860                 qperf_inc(q, tasklet_inbound_resched2);
 861                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 862                         tasklet_schedule(&q->tasklet);
 863         }
 864 }
 865
 866 void tiqdio_inbound_processing(unsigned long data)
 867 {
 868         struct qdio_q *q = (struct qdio_q *)data;
 869         __tiqdio_inbound_processing(q);
 870 }
 871
 872 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 873                                   enum qdio_irq_states state)
 874 {
 875         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 876
 877         irq_ptr->state = state;
 878         mb();
 879 }
 880
 881 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 882 {
 883         if (irb->esw.esw0.erw.cons) {
 884                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 885                 DBF_ERROR_HEX(irb, 64);
 886                 DBF_ERROR_HEX(irb->ecw, 64);
 887         }
 888 }
 889
 890 /* PCI interrupt handler */
 891 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 892 {
 893         int i;
 894         struct qdio_q *q;
 895
 896         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 897                 return;
 898
 899         for_each_input_queue(irq_ptr, q, i) {
 900                 if (q->u.in.queue_start_poll) {
 901                         /* skip if polling is enabled or already in work */
 902                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 903                                      &q->u.in.queue_irq_state)) {
 904                                 qperf_inc(q, int_discarded);
 905                                 continue;
 906                         }
 907                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 908                                                  q->irq_ptr->int_parm);
 909                 } else
 910                         tasklet_schedule(&q->tasklet);
 911         }
 912
 913         if (!pci_out_supported(q))
 914                 return;
 915
 916         for_each_output_queue(irq_ptr, q, i) {
 917                 if (qdio_outbound_q_done(q))
 918                         continue;
 919                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 920                         qdio_siga_sync_q(q);
 921                 tasklet_schedule(&q->tasklet);
 922         }
 923 }
 924
 925 static void qdio_handle_activate_check(struct ccw_device *cdev,
 926                                 unsigned long intparm, int cstat, int dstat)
 927 {
 928         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 929         struct qdio_q *q;
 930
 931         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 932         DBF_ERROR("intp :%lx", intparm);
 933         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 934
 935         if (irq_ptr->nr_input_qs) {
 936                 q = irq_ptr->input_qs[0];
 937         } else if (irq_ptr->nr_output_qs) {
 938                 q = irq_ptr->output_qs[0];
 939         } else {
 940                 dump_stack();
 941                 goto no_handler;
 942         }
 943         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 944                    0, -1, -1, irq_ptr->int_parm);
 945 no_handler:
 946         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 947 }
 948
 949 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 950                                       int dstat)
 951 {
 952         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 953
 954         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 955
 956         if (cstat)
 957                 goto error;
 958         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 959                 goto error;
 960         if (!(dstat & DEV_STAT_DEV_END))
 961                 goto error;
 962         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 963         return;
 964
 965 error:
 966         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 967         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 968         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 969 }
 970
 971 /* qdio interrupt handler */
 972 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 973                       struct irb *irb)
 974 {
 975         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 976         int cstat, dstat;
 977
 978         if (!intparm || !irq_ptr) {
 979                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 980                 return;
 981         }
 982
 983         kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++;
 984         if (irq_ptr->perf_stat_enabled)
 985                 irq_ptr->perf_stat.qdio_int++;
 986
 987         if (IS_ERR(irb)) {
 988                 switch (PTR_ERR(irb)) {
 989                 case -EIO:
 990                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 991                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 992                         wake_up(&cdev->private->wait_q);
 993                         return;
 994                 default:
 995                         WARN_ON(1);
 996                         return;
 997                 }
 998         }
 999         qdio_irq_check_sense(irq_ptr, irb);
1000         cstat = irb->scsw.cmd.cstat;
1001         dstat = irb->scsw.cmd.dstat;
1002
1003         switch (irq_ptr->state) {
1004         case QDIO_IRQ_STATE_INACTIVE:
1005                 qdio_establish_handle_irq(cdev, cstat, dstat);
1006                 break;
1007         case QDIO_IRQ_STATE_CLEANUP:
1008                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1009                 break;
1010         case QDIO_IRQ_STATE_ESTABLISHED:
1011         case QDIO_IRQ_STATE_ACTIVE:
1012                 if (cstat & SCHN_STAT_PCI) {
1013                         qdio_int_handler_pci(irq_ptr);
1014                         return;
1015                 }
1016                 if (cstat || dstat)
1017                         qdio_handle_activate_check(cdev, intparm, cstat,
1018                                                    dstat);
1019                 break;
1020         case QDIO_IRQ_STATE_STOPPED:
1021                 break;
1022         default:
1023                 WARN_ON(1);
1024         }
1025         wake_up(&cdev->private->wait_q);
1026 }
1027
1028 /**
1029  * qdio_get_ssqd_desc - get qdio subchannel description
1030  * @cdev: ccw device to get description for
1031  * @data: where to store the ssqd
1032  *
1033  * Returns 0 or an error code. The results of the chsc are stored in the
1034  * specified structure.
1035  */
1036 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1037                        struct qdio_ssqd_desc *data)
1038 {
1039
1040         if (!cdev || !cdev->private)
1041                 return -EINVAL;
1042
1043         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1044         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1045 }
1046 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1047
1048 static void qdio_shutdown_queues(struct ccw_device *cdev)
1049 {
1050         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1051         struct qdio_q *q;
1052         int i;
1053
1054         for_each_input_queue(irq_ptr, q, i)
1055                 tasklet_kill(&q->tasklet);
1056
1057         for_each_output_queue(irq_ptr, q, i) {
1058                 del_timer(&q->u.out.timer);
1059                 tasklet_kill(&q->tasklet);
1060         }
1061 }
1062
1063 /**
1064  * qdio_shutdown - shut down a qdio subchannel
1065  * @cdev: associated ccw device
1066  * @how: use halt or clear to shutdown
1067  */
1068 int qdio_shutdown(struct ccw_device *cdev, int how)
1069 {
1070         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1071         int rc;
1072         unsigned long flags;
1073
1074         if (!irq_ptr)
1075                 return -ENODEV;
1076
1077         BUG_ON(irqs_disabled());
1078         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1079
1080         mutex_lock(&irq_ptr->setup_mutex);
1081         /*
1082          * Subchannel was already shot down. We cannot prevent being called
1083          * twice since cio may trigger a shutdown asynchronously.
1084          */
1085         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1086                 mutex_unlock(&irq_ptr->setup_mutex);
1087                 return 0;
1088         }
1089
1090         /*
1091          * Indicate that the device is going down. Scheduling the queue
1092          * tasklets is forbidden from here on.
1093          */
1094         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1095
1096         tiqdio_remove_input_queues(irq_ptr);
1097         qdio_shutdown_queues(cdev);
1098         qdio_shutdown_debug_entries(irq_ptr, cdev);
1099
1100         /* cleanup subchannel */
1101         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1102
1103         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1104                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1105         else
1106                 /* default behaviour is halt */
1107                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1108         if (rc) {
1109                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1110                 DBF_ERROR("rc:%4d", rc);
1111                 goto no_cleanup;
1112         }
1113
1114         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1115         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1116         wait_event_interruptible_timeout(cdev->private->wait_q,
1117                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1118                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1119                 10 * HZ);
1120         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1121
1122 no_cleanup:
1123         qdio_shutdown_thinint(irq_ptr);
1124
1125         /* restore interrupt handler */
1126         if ((void *)cdev->handler == (void *)qdio_int_handler)
1127                 cdev->handler = irq_ptr->orig_handler;
1128         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1129
1130         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1131         mutex_unlock(&irq_ptr->setup_mutex);
1132         if (rc)
1133                 return rc;
1134         return 0;
1135 }
1136 EXPORT_SYMBOL_GPL(qdio_shutdown);
1137
1138 /**
1139  * qdio_free - free data structures for a qdio subchannel
1140  * @cdev: associated ccw device
1141  */
1142 int qdio_free(struct ccw_device *cdev)
1143 {
1144         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1145
1146         if (!irq_ptr)
1147                 return -ENODEV;
1148
1149         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1150         mutex_lock(&irq_ptr->setup_mutex);
1151
1152         if (irq_ptr->debug_area != NULL) {
1153                 debug_unregister(irq_ptr->debug_area);
1154                 irq_ptr->debug_area = NULL;
1155         }
1156         cdev->private->qdio_data = NULL;
1157         mutex_unlock(&irq_ptr->setup_mutex);
1158
1159         qdio_release_memory(irq_ptr);
1160         return 0;
1161 }
1162 EXPORT_SYMBOL_GPL(qdio_free);
1163
1164 /**
1165  * qdio_allocate - allocate qdio queues and associated data
1166  * @init_data: initialization data
1167  */
1168 int qdio_allocate(struct qdio_initialize *init_data)
1169 {
1170         struct qdio_irq *irq_ptr;
1171
1172         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1173
1174         if ((init_data->no_input_qs && !init_data->input_handler) ||
1175             (init_data->no_output_qs && !init_data->output_handler))
1176                 return -EINVAL;
1177
1178         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1179             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1180                 return -EINVAL;
1181
1182         if ((!init_data->input_sbal_addr_array) ||
1183             (!init_data->output_sbal_addr_array))
1184                 return -EINVAL;
1185
1186         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1187         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1188         if (!irq_ptr)
1189                 goto out_err;
1190
1191         mutex_init(&irq_ptr->setup_mutex);
1192         qdio_allocate_dbf(init_data, irq_ptr);
1193
1194         /*
1195          * Allocate a page for the chsc calls in qdio_establish.
1196          * Must be pre-allocated since a zfcp recovery will call
1197          * qdio_establish. In case of low memory and swap on a zfcp disk
1198          * we may not be able to allocate memory otherwise.
1199          */
1200         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1201         if (!irq_ptr->chsc_page)
1202                 goto out_rel;
1203
1204         /* qdr is used in ccw1.cda which is u32 */
1205         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1206         if (!irq_ptr->qdr)
1207                 goto out_rel;
1208         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1209
1210         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1211                              init_data->no_output_qs))
1212                 goto out_rel;
1213
1214         init_data->cdev->private->qdio_data = irq_ptr;
1215         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1216         return 0;
1217 out_rel:
1218         qdio_release_memory(irq_ptr);
1219 out_err:
1220         return -ENOMEM;
1221 }
1222 EXPORT_SYMBOL_GPL(qdio_allocate);
1223
1224 /**
1225  * qdio_establish - establish queues on a qdio subchannel
1226  * @init_data: initialization data
1227  */
1228 int qdio_establish(struct qdio_initialize *init_data)
1229 {
1230         struct qdio_irq *irq_ptr;
1231         struct ccw_device *cdev = init_data->cdev;
1232         unsigned long saveflags;
1233         int rc;
1234
1235         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1236
1237         irq_ptr = cdev->private->qdio_data;
1238         if (!irq_ptr)
1239                 return -ENODEV;
1240
1241         if (cdev->private->state != DEV_STATE_ONLINE)
1242                 return -EINVAL;
1243
1244         mutex_lock(&irq_ptr->setup_mutex);
1245         qdio_setup_irq(init_data);
1246
1247         rc = qdio_establish_thinint(irq_ptr);
1248         if (rc) {
1249                 mutex_unlock(&irq_ptr->setup_mutex);
1250                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1251                 return rc;
1252         }
1253
1254         /* establish q */
1255         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1256         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1257         irq_ptr->ccw.count = irq_ptr->equeue.count;
1258         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1259
1260         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1261         ccw_device_set_options_mask(cdev, 0);
1262
1263         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1264         if (rc) {
1265                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1266                 DBF_ERROR("rc:%4x", rc);
1267         }
1268         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1269
1270         if (rc) {
1271                 mutex_unlock(&irq_ptr->setup_mutex);
1272                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1273                 return rc;
1274         }
1275
1276         wait_event_interruptible_timeout(cdev->private->wait_q,
1277                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1278                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1279
1280         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1281                 mutex_unlock(&irq_ptr->setup_mutex);
1282                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1283                 return -EIO;
1284         }
1285
1286         qdio_setup_ssqd_info(irq_ptr);
1287         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1288
1289         /* qebsm is now setup if available, initialize buffer states */
1290         qdio_init_buf_states(irq_ptr);
1291
1292         mutex_unlock(&irq_ptr->setup_mutex);
1293         qdio_print_subchannel_info(irq_ptr, cdev);
1294         qdio_setup_debug_entries(irq_ptr, cdev);
1295         return 0;
1296 }
1297 EXPORT_SYMBOL_GPL(qdio_establish);
1298
1299 /**
1300  * qdio_activate - activate queues on a qdio subchannel
1301  * @cdev: associated cdev
1302  */
1303 int qdio_activate(struct ccw_device *cdev)
1304 {
1305         struct qdio_irq *irq_ptr;
1306         int rc;
1307         unsigned long saveflags;
1308
1309         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1310
1311         irq_ptr = cdev->private->qdio_data;
1312         if (!irq_ptr)
1313                 return -ENODEV;
1314
1315         if (cdev->private->state != DEV_STATE_ONLINE)
1316                 return -EINVAL;
1317
1318         mutex_lock(&irq_ptr->setup_mutex);
1319         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1320                 rc = -EBUSY;
1321                 goto out;
1322         }
1323
1324         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1325         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1326         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1327         irq_ptr->ccw.cda = 0;
1328
1329         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1330         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1331
1332         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1333                               0, DOIO_DENY_PREFETCH);
1334         if (rc) {
1335                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1336                 DBF_ERROR("rc:%4x", rc);
1337         }
1338         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1339
1340         if (rc)
1341                 goto out;
1342
1343         if (is_thinint_irq(irq_ptr))
1344                 tiqdio_add_input_queues(irq_ptr);
1345
1346         /* wait for subchannel to become active */
1347         msleep(5);
1348
1349         switch (irq_ptr->state) {
1350         case QDIO_IRQ_STATE_STOPPED:
1351         case QDIO_IRQ_STATE_ERR:
1352                 rc = -EIO;
1353                 break;
1354         default:
1355                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1356                 rc = 0;
1357         }
1358 out:
1359         mutex_unlock(&irq_ptr->setup_mutex);
1360         return rc;
1361 }
1362 EXPORT_SYMBOL_GPL(qdio_activate);
1363
1364 static inline int buf_in_between(int bufnr, int start, int count)
1365 {
1366         int end = add_buf(start, count);
1367
1368         if (end > start) {
1369                 if (bufnr >= start && bufnr < end)
1370                         return 1;
1371                 else
1372                         return 0;
1373         }
1374
1375         /* wrap-around case */
1376         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1377             (bufnr < end))
1378                 return 1;
1379         else
1380                 return 0;
1381 }
1382
1383 /**
1384  * handle_inbound - reset processed input buffers
1385  * @q: queue containing the buffers
1386  * @callflags: flags
1387  * @bufnr: first buffer to process
1388  * @count: how many buffers are emptied
1389  */
1390 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1391                           int bufnr, int count)
1392 {
1393         int used, diff;
1394
1395         qperf_inc(q, inbound_call);
1396
1397         if (!q->u.in.polling)
1398                 goto set;
1399
1400         /* protect against stop polling setting an ACK for an emptied slsb */
1401         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1402                 /* overwriting everything, just delete polling status */
1403                 q->u.in.polling = 0;
1404                 q->u.in.ack_count = 0;
1405                 goto set;
1406         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1407                 if (is_qebsm(q)) {
1408                         /* partial overwrite, just update ack_start */
1409                         diff = add_buf(bufnr, count);
1410                         diff = sub_buf(diff, q->u.in.ack_start);
1411                         q->u.in.ack_count -= diff;
1412                         if (q->u.in.ack_count <= 0) {
1413                                 q->u.in.polling = 0;
1414                                 q->u.in.ack_count = 0;
1415                                 goto set;
1416                         }
1417                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1418                 }
1419                 else
1420                         /* the only ACK will be deleted, so stop polling */
1421                         q->u.in.polling = 0;
1422         }
1423
1424 set:
1425         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1426
1427         used = atomic_add_return(count, &q->nr_buf_used) - count;
1428         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1429
1430         /* no need to signal as long as the adapter had free buffers */
1431         if (used)
1432                 return 0;
1433
1434         if (need_siga_in(q))
1435                 return qdio_siga_input(q);
1436         return 0;
1437 }
1438
1439 /**
1440  * handle_outbound - process filled outbound buffers
1441  * @q: queue containing the buffers
1442  * @callflags: flags
1443  * @bufnr: first buffer to process
1444  * @count: how many buffers are filled
1445  */
1446 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1447                            int bufnr, int count)
1448 {
1449         unsigned char state = 0;
1450         int used, rc = 0;
1451
1452         qperf_inc(q, outbound_call);
1453
1454         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1455         used = atomic_add_return(count, &q->nr_buf_used);
1456         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1457
1458         if (used == QDIO_MAX_BUFFERS_PER_Q)
1459                 qperf_inc(q, outbound_queue_full);
1460
1461         if (callflags & QDIO_FLAG_PCI_OUT) {
1462                 q->u.out.pci_out_enabled = 1;
1463                 qperf_inc(q, pci_request_int);
1464         } else
1465                 q->u.out.pci_out_enabled = 0;
1466
1467         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1468                 /* One SIGA-W per buffer required for unicast HiperSockets. */
1469                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1470
1471                 rc = qdio_kick_outbound_q(q);
1472         } else if (need_siga_sync(q)) {
1473                 rc = qdio_siga_sync_q(q);
1474         } else {
1475                 /* try to fast requeue buffers */
1476                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1477                 if (state != SLSB_CU_OUTPUT_PRIMED)
1478                         rc = qdio_kick_outbound_q(q);
1479                 else
1480                         qperf_inc(q, fast_requeue);
1481         }
1482
1483         /* in case of SIGA errors we must process the error immediately */
1484         if (used >= q->u.out.scan_threshold || rc)
1485                 tasklet_schedule(&q->tasklet);
1486         else
1487                 /* free the SBALs in case of no further traffic */
1488                 if (!timer_pending(&q->u.out.timer))
1489                         mod_timer(&q->u.out.timer, jiffies + HZ);
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         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1514                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1515
1516         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1517                 return -EBUSY;
1518         if (!count)
1519                 return 0;
1520         if (callflags & QDIO_FLAG_SYNC_INPUT)
1521                 return handle_inbound(irq_ptr->input_qs[q_nr],
1522                                       callflags, bufnr, count);
1523         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1524                 return handle_outbound(irq_ptr->output_qs[q_nr],
1525                                        callflags, bufnr, count);
1526         return -EINVAL;
1527 }
1528 EXPORT_SYMBOL_GPL(do_QDIO);
1529
1530 /**
1531  * qdio_start_irq - process input buffers
1532  * @cdev: associated ccw_device for the qdio subchannel
1533  * @nr: input queue number
1534  *
1535  * Return codes
1536  *   0 - success
1537  *   1 - irqs not started since new data is available
1538  */
1539 int qdio_start_irq(struct ccw_device *cdev, int nr)
1540 {
1541         struct qdio_q *q;
1542         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1543
1544         if (!irq_ptr)
1545                 return -ENODEV;
1546         q = irq_ptr->input_qs[nr];
1547
1548         WARN_ON(queue_irqs_enabled(q));
1549
1550         if (!shared_ind(q->irq_ptr->dsci))
1551                 xchg(q->irq_ptr->dsci, 0);
1552
1553         qdio_stop_polling(q);
1554         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1555
1556         /*
1557          * We need to check again to not lose initiative after
1558          * resetting the ACK state.
1559          */
1560         if (!shared_ind(q->irq_ptr->dsci) && *q->irq_ptr->dsci)
1561                 goto rescan;
1562         if (!qdio_inbound_q_done(q))
1563                 goto rescan;
1564         return 0;
1565
1566 rescan:
1567         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1568                              &q->u.in.queue_irq_state))
1569                 return 0;
1570         else
1571                 return 1;
1572
1573 }
1574 EXPORT_SYMBOL(qdio_start_irq);
1575
1576 /**
1577  * qdio_get_next_buffers - process input buffers
1578  * @cdev: associated ccw_device for the qdio subchannel
1579  * @nr: input queue number
1580  * @bufnr: first filled buffer number
1581  * @error: buffers are in error state
1582  *
1583  * Return codes
1584  *   < 0 - error
1585  *   = 0 - no new buffers found
1586  *   > 0 - number of processed buffers
1587  */
1588 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1589                           int *error)
1590 {
1591         struct qdio_q *q;
1592         int start, end;
1593         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1594
1595         if (!irq_ptr)
1596                 return -ENODEV;
1597         q = irq_ptr->input_qs[nr];
1598         WARN_ON(queue_irqs_enabled(q));
1599
1600         /*
1601          * Cannot rely on automatic sync after interrupt since queues may
1602          * also be examined without interrupt.
1603          */
1604         if (need_siga_sync(q))
1605                 qdio_sync_queues(q);
1606
1607         /* check the PCI capable outbound queues. */
1608         qdio_check_outbound_after_thinint(q);
1609
1610         if (!qdio_inbound_q_moved(q))
1611                 return 0;
1612
1613         /* Note: upper-layer MUST stop processing immediately here ... */
1614         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1615                 return -EIO;
1616
1617         start = q->first_to_kick;
1618         end = q->first_to_check;
1619         *bufnr = start;
1620         *error = q->qdio_error;
1621
1622         /* for the next time */
1623         q->first_to_kick = end;
1624         q->qdio_error = 0;
1625         return sub_buf(end, start);
1626 }
1627 EXPORT_SYMBOL(qdio_get_next_buffers);
1628
1629 /**
1630  * qdio_stop_irq - disable interrupt processing for the device
1631  * @cdev: associated ccw_device for the qdio subchannel
1632  * @nr: input queue number
1633  *
1634  * Return codes
1635  *   0 - interrupts were already disabled
1636  *   1 - interrupts successfully disabled
1637  */
1638 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1639 {
1640         struct qdio_q *q;
1641         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1642
1643         if (!irq_ptr)
1644                 return -ENODEV;
1645         q = irq_ptr->input_qs[nr];
1646
1647         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1648                              &q->u.in.queue_irq_state))
1649                 return 0;
1650         else
1651                 return 1;
1652 }
1653 EXPORT_SYMBOL(qdio_stop_irq);
1654
1655 static int __init init_QDIO(void)
1656 {
1657         int rc;
1658
1659         rc = qdio_debug_init();
1660         if (rc)
1661                 return rc;
1662         rc = qdio_setup_init();
1663         if (rc)
1664                 goto out_debug;
1665         rc = tiqdio_allocate_memory();
1666         if (rc)
1667                 goto out_cache;
1668         rc = tiqdio_register_thinints();
1669         if (rc)
1670                 goto out_ti;
1671         return 0;
1672
1673 out_ti:
1674         tiqdio_free_memory();
1675 out_cache:
1676         qdio_setup_exit();
1677 out_debug:
1678         qdio_debug_exit();
1679         return rc;
1680 }
1681
1682 static void __exit exit_QDIO(void)
1683 {
1684         tiqdio_unregister_thinints();
1685         tiqdio_free_memory();
1686         qdio_setup_exit();
1687         qdio_debug_exit();
1688 }
1689
1690 module_init(init_QDIO);
1691 module_exit(exit_QDIO);