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 <asm/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 announce_buffer_error(struct qdio_q *q, int count)
 411 {
 412         q->qdio_error |= QDIO_ERROR_SLSB_STATE;
 413
 414         /* special handling for no target buffer empty */
 415         if ((!q->is_input_q &&
 416             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 417                 qperf_inc(q, target_full);
 418                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 419                               q->first_to_check);
 420                 return;
 421         }
 422
 423         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 424         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 425         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 426         DBF_ERROR("F14:%2x F15:%2x",
 427                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 428                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 429 }
 430
 431 static inline void inbound_primed(struct qdio_q *q, int count)
 432 {
 433         int new;
 434
 435         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 436
 437         /* for QEBSM the ACK was already set by EQBS */
 438         if (is_qebsm(q)) {
 439                 if (!q->u.in.polling) {
 440                         q->u.in.polling = 1;
 441                         q->u.in.ack_count = count;
 442                         q->u.in.ack_start = q->first_to_check;
 443                         return;
 444                 }
 445
 446                 /* delete the previous ACK's */
 447                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 448                                q->u.in.ack_count);
 449                 q->u.in.ack_count = count;
 450                 q->u.in.ack_start = q->first_to_check;
 451                 return;
 452         }
 453
 454         /*
 455          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 456          * or by the next inbound run.
 457          */
 458         new = add_buf(q->first_to_check, count - 1);
 459         if (q->u.in.polling) {
 460                 /* reset the previous ACK but first set the new one */
 461                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 462                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 463         } else {
 464                 q->u.in.polling = 1;
 465                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 466         }
 467
 468         q->u.in.ack_start = new;
 469         count--;
 470         if (!count)
 471                 return;
 472         /* need to change ALL buffers to get more interrupts */
 473         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 474 }
 475
 476 static int get_inbound_buffer_frontier(struct qdio_q *q)
 477 {
 478         int count, stop;
 479         unsigned char state = 0;
 480
 481         /*
 482          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 483          * would return 0.
 484          */
 485         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 486         stop = add_buf(q->first_to_check, count);
 487
 488         if (q->first_to_check == stop)
 489                 goto out;
 490
 491         /*
 492          * No siga sync here, as a PCI or we after a thin interrupt
 493          * already sync'ed the queues.
 494          */
 495         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 496         if (!count)
 497                 goto out;
 498
 499         switch (state) {
 500         case SLSB_P_INPUT_PRIMED:
 501                 inbound_primed(q, count);
 502                 q->first_to_check = add_buf(q->first_to_check, count);
 503                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 504                         qperf_inc(q, inbound_queue_full);
 505                 if (q->irq_ptr->perf_stat_enabled)
 506                         account_sbals(q, count);
 507                 break;
 508         case SLSB_P_INPUT_ERROR:
 509                 announce_buffer_error(q, count);
 510                 /* process the buffer, the upper layer will take care of it */
 511                 q->first_to_check = add_buf(q->first_to_check, count);
 512                 atomic_sub(count, &q->nr_buf_used);
 513                 if (q->irq_ptr->perf_stat_enabled)
 514                         account_sbals_error(q, count);
 515                 break;
 516         case SLSB_CU_INPUT_EMPTY:
 517         case SLSB_P_INPUT_NOT_INIT:
 518         case SLSB_P_INPUT_ACK:
 519                 if (q->irq_ptr->perf_stat_enabled)
 520                         q->q_stats.nr_sbal_nop++;
 521                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 522                 break;
 523         default:
 524                 BUG();
 525         }
 526 out:
 527         return q->first_to_check;
 528 }
 529
 530 static int qdio_inbound_q_moved(struct qdio_q *q)
 531 {
 532         int bufnr;
 533
 534         bufnr = get_inbound_buffer_frontier(q);
 535
 536         if ((bufnr != q->last_move) || q->qdio_error) {
 537                 q->last_move = bufnr;
 538                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 539                         q->u.in.timestamp = get_clock();
 540                 return 1;
 541         } else
 542                 return 0;
 543 }
 544
 545 static inline int qdio_inbound_q_done(struct qdio_q *q)
 546 {
 547         unsigned char state = 0;
 548
 549         if (!atomic_read(&q->nr_buf_used))
 550                 return 1;
 551
 552         if (need_siga_sync(q))
 553                 qdio_siga_sync_q(q);
 554         get_buf_state(q, q->first_to_check, &state, 0);
 555
 556         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 557                 /* more work coming */
 558                 return 0;
 559
 560         if (is_thinint_irq(q->irq_ptr))
 561                 return 1;
 562
 563         /* don't poll under z/VM */
 564         if (MACHINE_IS_VM)
 565                 return 1;
 566
 567         /*
 568          * At this point we know, that inbound first_to_check
 569          * has (probably) not moved (see qdio_inbound_processing).
 570          */
 571         if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 572                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 573                               q->first_to_check);
 574                 return 1;
 575         } else
 576                 return 0;
 577 }
 578
 579 static void qdio_kick_handler(struct qdio_q *q)
 580 {
 581         int start = q->first_to_kick;
 582         int end = q->first_to_check;
 583         int count;
 584
 585         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 586                 return;
 587
 588         count = sub_buf(end, start);
 589
 590         if (q->is_input_q) {
 591                 qperf_inc(q, inbound_handler);
 592                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 593         } else {
 594                 qperf_inc(q, outbound_handler);
 595                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 596                               start, count);
 597         }
 598
 599         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 600                    q->irq_ptr->int_parm);
 601
 602         /* for the next time */
 603         q->first_to_kick = end;
 604         q->qdio_error = 0;
 605 }
 606
 607 static void __qdio_inbound_processing(struct qdio_q *q)
 608 {
 609         qperf_inc(q, tasklet_inbound);
 610
 611         if (!qdio_inbound_q_moved(q))
 612                 return;
 613
 614         qdio_kick_handler(q);
 615
 616         if (!qdio_inbound_q_done(q)) {
 617                 /* means poll time is not yet over */
 618                 qperf_inc(q, tasklet_inbound_resched);
 619                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 620                         tasklet_schedule(&q->tasklet);
 621                         return;
 622                 }
 623         }
 624
 625         qdio_stop_polling(q);
 626         /*
 627          * We need to check again to not lose initiative after
 628          * resetting the ACK state.
 629          */
 630         if (!qdio_inbound_q_done(q)) {
 631                 qperf_inc(q, tasklet_inbound_resched2);
 632                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 633                         tasklet_schedule(&q->tasklet);
 634         }
 635 }
 636
 637 void qdio_inbound_processing(unsigned long data)
 638 {
 639         struct qdio_q *q = (struct qdio_q *)data;
 640         __qdio_inbound_processing(q);
 641 }
 642
 643 static int get_outbound_buffer_frontier(struct qdio_q *q)
 644 {
 645         int count, stop;
 646         unsigned char state = 0;
 647
 648         if (need_siga_sync(q))
 649                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 650                     !pci_out_supported(q)) ||
 651                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 652                     multicast_outbound(q)))
 653                         qdio_siga_sync_q(q);
 654
 655         /*
 656          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 657          * would return 0.
 658          */
 659         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 660         stop = add_buf(q->first_to_check, count);
 661
 662         if (q->first_to_check == stop)
 663                 return q->first_to_check;
 664
 665         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 666         if (!count)
 667                 return q->first_to_check;
 668
 669         switch (state) {
 670         case SLSB_P_OUTPUT_EMPTY:
 671                 /* the adapter got it */
 672                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %02x", q->nr, count);
 673
 674                 atomic_sub(count, &q->nr_buf_used);
 675                 q->first_to_check = add_buf(q->first_to_check, count);
 676                 if (q->irq_ptr->perf_stat_enabled)
 677                         account_sbals(q, count);
 678                 break;
 679         case SLSB_P_OUTPUT_ERROR:
 680                 announce_buffer_error(q, count);
 681                 /* process the buffer, the upper layer will take care of it */
 682                 q->first_to_check = add_buf(q->first_to_check, count);
 683                 atomic_sub(count, &q->nr_buf_used);
 684                 if (q->irq_ptr->perf_stat_enabled)
 685                         account_sbals_error(q, count);
 686                 break;
 687         case SLSB_CU_OUTPUT_PRIMED:
 688                 /* the adapter has not fetched the output yet */
 689                 if (q->irq_ptr->perf_stat_enabled)
 690                         q->q_stats.nr_sbal_nop++;
 691                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 692                 break;
 693         case SLSB_P_OUTPUT_NOT_INIT:
 694         case SLSB_P_OUTPUT_HALTED:
 695                 break;
 696         default:
 697                 BUG();
 698         }
 699         return q->first_to_check;
 700 }
 701
 702 /* all buffers processed? */
 703 static inline int qdio_outbound_q_done(struct qdio_q *q)
 704 {
 705         return atomic_read(&q->nr_buf_used) == 0;
 706 }
 707
 708 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 709 {
 710         int bufnr;
 711
 712         bufnr = get_outbound_buffer_frontier(q);
 713
 714         if ((bufnr != q->last_move) || q->qdio_error) {
 715                 q->last_move = bufnr;
 716                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 717                 return 1;
 718         } else
 719                 return 0;
 720 }
 721
 722 static int qdio_kick_outbound_q(struct qdio_q *q)
 723 {
 724         unsigned int busy_bit;
 725         int cc;
 726
 727         if (!need_siga_out(q))
 728                 return 0;
 729
 730         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 731         qperf_inc(q, siga_write);
 732
 733         cc = qdio_siga_output(q, &busy_bit);
 734         switch (cc) {
 735         case 0:
 736                 break;
 737         case 2:
 738                 if (busy_bit) {
 739                         DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 740                         cc |= QDIO_ERROR_SIGA_BUSY;
 741                 } else
 742                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 743                 break;
 744         case 1:
 745         case 3:
 746                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 747                 break;
 748         }
 749         return cc;
 750 }
 751
 752 static void __qdio_outbound_processing(struct qdio_q *q)
 753 {
 754         qperf_inc(q, tasklet_outbound);
 755         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 756
 757         if (qdio_outbound_q_moved(q))
 758                 qdio_kick_handler(q);
 759
 760         if (queue_type(q) == QDIO_ZFCP_QFMT)
 761                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 762                         goto sched;
 763
 764         /* bail out for HiperSockets unicast queues */
 765         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 766                 return;
 767
 768         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 769             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
 770                 goto sched;
 771
 772         if (q->u.out.pci_out_enabled)
 773                 return;
 774
 775         /*
 776          * Now we know that queue type is either qeth without pci enabled
 777          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 778          * EMPTY is noticed and outbound_handler is called after some time.
 779          */
 780         if (qdio_outbound_q_done(q))
 781                 del_timer(&q->u.out.timer);
 782         else
 783                 if (!timer_pending(&q->u.out.timer))
 784                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 785         return;
 786
 787 sched:
 788         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 789                 return;
 790         tasklet_schedule(&q->tasklet);
 791 }
 792
 793 /* outbound tasklet */
 794 void qdio_outbound_processing(unsigned long data)
 795 {
 796         struct qdio_q *q = (struct qdio_q *)data;
 797         __qdio_outbound_processing(q);
 798 }
 799
 800 void qdio_outbound_timer(unsigned long data)
 801 {
 802         struct qdio_q *q = (struct qdio_q *)data;
 803
 804         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 805                 return;
 806         tasklet_schedule(&q->tasklet);
 807 }
 808
 809 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 810 {
 811         struct qdio_q *out;
 812         int i;
 813
 814         if (!pci_out_supported(q))
 815                 return;
 816
 817         for_each_output_queue(q->irq_ptr, out, i)
 818                 if (!qdio_outbound_q_done(out))
 819                         tasklet_schedule(&out->tasklet);
 820 }
 821
 822 static void __tiqdio_inbound_processing(struct qdio_q *q)
 823 {
 824         qperf_inc(q, tasklet_inbound);
 825         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 826                 qdio_sync_queues(q);
 827
 828         /*
 829          * The interrupt could be caused by a PCI request. Check the
 830          * PCI capable outbound queues.
 831          */
 832         qdio_check_outbound_after_thinint(q);
 833
 834         if (!qdio_inbound_q_moved(q))
 835                 return;
 836
 837         qdio_kick_handler(q);
 838
 839         if (!qdio_inbound_q_done(q)) {
 840                 qperf_inc(q, tasklet_inbound_resched);
 841                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 842                         tasklet_schedule(&q->tasklet);
 843                         return;
 844                 }
 845         }
 846
 847         qdio_stop_polling(q);
 848         /*
 849          * We need to check again to not lose initiative after
 850          * resetting the ACK state.
 851          */
 852         if (!qdio_inbound_q_done(q)) {
 853                 qperf_inc(q, tasklet_inbound_resched2);
 854                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 855                         tasklet_schedule(&q->tasklet);
 856         }
 857 }
 858
 859 void tiqdio_inbound_processing(unsigned long data)
 860 {
 861         struct qdio_q *q = (struct qdio_q *)data;
 862         __tiqdio_inbound_processing(q);
 863 }
 864
 865 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 866                                   enum qdio_irq_states state)
 867 {
 868         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 869
 870         irq_ptr->state = state;
 871         mb();
 872 }
 873
 874 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 875 {
 876         if (irb->esw.esw0.erw.cons) {
 877                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 878                 DBF_ERROR_HEX(irb, 64);
 879                 DBF_ERROR_HEX(irb->ecw, 64);
 880         }
 881 }
 882
 883 /* PCI interrupt handler */
 884 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 885 {
 886         int i;
 887         struct qdio_q *q;
 888
 889         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 890                 return;
 891
 892         for_each_input_queue(irq_ptr, q, i) {
 893                 if (q->u.in.queue_start_poll) {
 894                         /* skip if polling is enabled or already in work */
 895                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 896                                      &q->u.in.queue_irq_state)) {
 897                                 qperf_inc(q, int_discarded);
 898                                 continue;
 899                         }
 900                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 901                                                  q->irq_ptr->int_parm);
 902                 } else
 903                         tasklet_schedule(&q->tasklet);
 904         }
 905
 906         if (!pci_out_supported(q))
 907                 return;
 908
 909         for_each_output_queue(irq_ptr, q, i) {
 910                 if (qdio_outbound_q_done(q))
 911                         continue;
 912                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 913                         qdio_siga_sync_q(q);
 914                 tasklet_schedule(&q->tasklet);
 915         }
 916 }
 917
 918 static void qdio_handle_activate_check(struct ccw_device *cdev,
 919                                 unsigned long intparm, int cstat, int dstat)
 920 {
 921         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 922         struct qdio_q *q;
 923
 924         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 925         DBF_ERROR("intp :%lx", intparm);
 926         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 927
 928         if (irq_ptr->nr_input_qs) {
 929                 q = irq_ptr->input_qs[0];
 930         } else if (irq_ptr->nr_output_qs) {
 931                 q = irq_ptr->output_qs[0];
 932         } else {
 933                 dump_stack();
 934                 goto no_handler;
 935         }
 936         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 937                    0, -1, -1, irq_ptr->int_parm);
 938 no_handler:
 939         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 940 }
 941
 942 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
 943                                       int dstat)
 944 {
 945         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 946
 947         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 948
 949         if (cstat)
 950                 goto error;
 951         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 952                 goto error;
 953         if (!(dstat & DEV_STAT_DEV_END))
 954                 goto error;
 955         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 956         return;
 957
 958 error:
 959         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 960         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 961         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 962 }
 963
 964 /* qdio interrupt handler */
 965 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 966                       struct irb *irb)
 967 {
 968         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 969         int cstat, dstat;
 970
 971         if (!intparm || !irq_ptr) {
 972                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
 973                 return;
 974         }
 975
 976         kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++;
 977         if (irq_ptr->perf_stat_enabled)
 978                 irq_ptr->perf_stat.qdio_int++;
 979
 980         if (IS_ERR(irb)) {
 981                 switch (PTR_ERR(irb)) {
 982                 case -EIO:
 983                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 984                         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 985                         wake_up(&cdev->private->wait_q);
 986                         return;
 987                 default:
 988                         WARN_ON(1);
 989                         return;
 990                 }
 991         }
 992         qdio_irq_check_sense(irq_ptr, irb);
 993         cstat = irb->scsw.cmd.cstat;
 994         dstat = irb->scsw.cmd.dstat;
 995
 996         switch (irq_ptr->state) {
 997         case QDIO_IRQ_STATE_INACTIVE:
 998                 qdio_establish_handle_irq(cdev, cstat, dstat);
 999                 break;
1000         case QDIO_IRQ_STATE_CLEANUP:
1001                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1002                 break;
1003         case QDIO_IRQ_STATE_ESTABLISHED:
1004         case QDIO_IRQ_STATE_ACTIVE:
1005                 if (cstat & SCHN_STAT_PCI) {
1006                         qdio_int_handler_pci(irq_ptr);
1007                         return;
1008                 }
1009                 if (cstat || dstat)
1010                         qdio_handle_activate_check(cdev, intparm, cstat,
1011                                                    dstat);
1012                 break;
1013         case QDIO_IRQ_STATE_STOPPED:
1014                 break;
1015         default:
1016                 WARN_ON(1);
1017         }
1018         wake_up(&cdev->private->wait_q);
1019 }
1020
1021 /**
1022  * qdio_get_ssqd_desc - get qdio subchannel description
1023  * @cdev: ccw device to get description for
1024  * @data: where to store the ssqd
1025  *
1026  * Returns 0 or an error code. The results of the chsc are stored in the
1027  * specified structure.
1028  */
1029 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1030                        struct qdio_ssqd_desc *data)
1031 {
1032
1033         if (!cdev || !cdev->private)
1034                 return -EINVAL;
1035
1036         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1037         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1038 }
1039 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1040
1041 static void qdio_shutdown_queues(struct ccw_device *cdev)
1042 {
1043         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1044         struct qdio_q *q;
1045         int i;
1046
1047         for_each_input_queue(irq_ptr, q, i)
1048                 tasklet_kill(&q->tasklet);
1049
1050         for_each_output_queue(irq_ptr, q, i) {
1051                 del_timer(&q->u.out.timer);
1052                 tasklet_kill(&q->tasklet);
1053         }
1054 }
1055
1056 /**
1057  * qdio_shutdown - shut down a qdio subchannel
1058  * @cdev: associated ccw device
1059  * @how: use halt or clear to shutdown
1060  */
1061 int qdio_shutdown(struct ccw_device *cdev, int how)
1062 {
1063         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1064         int rc;
1065         unsigned long flags;
1066
1067         if (!irq_ptr)
1068                 return -ENODEV;
1069
1070         BUG_ON(irqs_disabled());
1071         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1072
1073         mutex_lock(&irq_ptr->setup_mutex);
1074         /*
1075          * Subchannel was already shot down. We cannot prevent being called
1076          * twice since cio may trigger a shutdown asynchronously.
1077          */
1078         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1079                 mutex_unlock(&irq_ptr->setup_mutex);
1080                 return 0;
1081         }
1082
1083         /*
1084          * Indicate that the device is going down. Scheduling the queue
1085          * tasklets is forbidden from here on.
1086          */
1087         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1088
1089         tiqdio_remove_input_queues(irq_ptr);
1090         qdio_shutdown_queues(cdev);
1091         qdio_shutdown_debug_entries(irq_ptr, cdev);
1092
1093         /* cleanup subchannel */
1094         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1095
1096         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1097                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1098         else
1099                 /* default behaviour is halt */
1100                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1101         if (rc) {
1102                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1103                 DBF_ERROR("rc:%4d", rc);
1104                 goto no_cleanup;
1105         }
1106
1107         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1108         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1109         wait_event_interruptible_timeout(cdev->private->wait_q,
1110                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1111                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1112                 10 * HZ);
1113         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1114
1115 no_cleanup:
1116         qdio_shutdown_thinint(irq_ptr);
1117
1118         /* restore interrupt handler */
1119         if ((void *)cdev->handler == (void *)qdio_int_handler)
1120                 cdev->handler = irq_ptr->orig_handler;
1121         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1122
1123         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1124         mutex_unlock(&irq_ptr->setup_mutex);
1125         if (rc)
1126                 return rc;
1127         return 0;
1128 }
1129 EXPORT_SYMBOL_GPL(qdio_shutdown);
1130
1131 /**
1132  * qdio_free - free data structures for a qdio subchannel
1133  * @cdev: associated ccw device
1134  */
1135 int qdio_free(struct ccw_device *cdev)
1136 {
1137         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1138
1139         if (!irq_ptr)
1140                 return -ENODEV;
1141
1142         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1143         mutex_lock(&irq_ptr->setup_mutex);
1144
1145         if (irq_ptr->debug_area != NULL) {
1146                 debug_unregister(irq_ptr->debug_area);
1147                 irq_ptr->debug_area = NULL;
1148         }
1149         cdev->private->qdio_data = NULL;
1150         mutex_unlock(&irq_ptr->setup_mutex);
1151
1152         qdio_release_memory(irq_ptr);
1153         return 0;
1154 }
1155 EXPORT_SYMBOL_GPL(qdio_free);
1156
1157 /**
1158  * qdio_allocate - allocate qdio queues and associated data
1159  * @init_data: initialization data
1160  */
1161 int qdio_allocate(struct qdio_initialize *init_data)
1162 {
1163         struct qdio_irq *irq_ptr;
1164
1165         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1166
1167         if ((init_data->no_input_qs && !init_data->input_handler) ||
1168             (init_data->no_output_qs && !init_data->output_handler))
1169                 return -EINVAL;
1170
1171         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1172             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1173                 return -EINVAL;
1174
1175         if ((!init_data->input_sbal_addr_array) ||
1176             (!init_data->output_sbal_addr_array))
1177                 return -EINVAL;
1178
1179         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1180         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1181         if (!irq_ptr)
1182                 goto out_err;
1183
1184         mutex_init(&irq_ptr->setup_mutex);
1185         qdio_allocate_dbf(init_data, irq_ptr);
1186
1187         /*
1188          * Allocate a page for the chsc calls in qdio_establish.
1189          * Must be pre-allocated since a zfcp recovery will call
1190          * qdio_establish. In case of low memory and swap on a zfcp disk
1191          * we may not be able to allocate memory otherwise.
1192          */
1193         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1194         if (!irq_ptr->chsc_page)
1195                 goto out_rel;
1196
1197         /* qdr is used in ccw1.cda which is u32 */
1198         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1199         if (!irq_ptr->qdr)
1200                 goto out_rel;
1201         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1202
1203         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1204                              init_data->no_output_qs))
1205                 goto out_rel;
1206
1207         init_data->cdev->private->qdio_data = irq_ptr;
1208         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1209         return 0;
1210 out_rel:
1211         qdio_release_memory(irq_ptr);
1212 out_err:
1213         return -ENOMEM;
1214 }
1215 EXPORT_SYMBOL_GPL(qdio_allocate);
1216
1217 /**
1218  * qdio_establish - establish queues on a qdio subchannel
1219  * @init_data: initialization data
1220  */
1221 int qdio_establish(struct qdio_initialize *init_data)
1222 {
1223         struct qdio_irq *irq_ptr;
1224         struct ccw_device *cdev = init_data->cdev;
1225         unsigned long saveflags;
1226         int rc;
1227
1228         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1229
1230         irq_ptr = cdev->private->qdio_data;
1231         if (!irq_ptr)
1232                 return -ENODEV;
1233
1234         if (cdev->private->state != DEV_STATE_ONLINE)
1235                 return -EINVAL;
1236
1237         mutex_lock(&irq_ptr->setup_mutex);
1238         qdio_setup_irq(init_data);
1239
1240         rc = qdio_establish_thinint(irq_ptr);
1241         if (rc) {
1242                 mutex_unlock(&irq_ptr->setup_mutex);
1243                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1244                 return rc;
1245         }
1246
1247         /* establish q */
1248         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1249         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1250         irq_ptr->ccw.count = irq_ptr->equeue.count;
1251         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1252
1253         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1254         ccw_device_set_options_mask(cdev, 0);
1255
1256         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1257         if (rc) {
1258                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1259                 DBF_ERROR("rc:%4x", rc);
1260         }
1261         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1262
1263         if (rc) {
1264                 mutex_unlock(&irq_ptr->setup_mutex);
1265                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1266                 return rc;
1267         }
1268
1269         wait_event_interruptible_timeout(cdev->private->wait_q,
1270                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1271                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1272
1273         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1274                 mutex_unlock(&irq_ptr->setup_mutex);
1275                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1276                 return -EIO;
1277         }
1278
1279         qdio_setup_ssqd_info(irq_ptr);
1280         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1281
1282         /* qebsm is now setup if available, initialize buffer states */
1283         qdio_init_buf_states(irq_ptr);
1284
1285         mutex_unlock(&irq_ptr->setup_mutex);
1286         qdio_print_subchannel_info(irq_ptr, cdev);
1287         qdio_setup_debug_entries(irq_ptr, cdev);
1288         return 0;
1289 }
1290 EXPORT_SYMBOL_GPL(qdio_establish);
1291
1292 /**
1293  * qdio_activate - activate queues on a qdio subchannel
1294  * @cdev: associated cdev
1295  */
1296 int qdio_activate(struct ccw_device *cdev)
1297 {
1298         struct qdio_irq *irq_ptr;
1299         int rc;
1300         unsigned long saveflags;
1301
1302         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1303
1304         irq_ptr = cdev->private->qdio_data;
1305         if (!irq_ptr)
1306                 return -ENODEV;
1307
1308         if (cdev->private->state != DEV_STATE_ONLINE)
1309                 return -EINVAL;
1310
1311         mutex_lock(&irq_ptr->setup_mutex);
1312         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1313                 rc = -EBUSY;
1314                 goto out;
1315         }
1316
1317         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1318         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1319         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1320         irq_ptr->ccw.cda = 0;
1321
1322         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1323         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1324
1325         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1326                               0, DOIO_DENY_PREFETCH);
1327         if (rc) {
1328                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1329                 DBF_ERROR("rc:%4x", rc);
1330         }
1331         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1332
1333         if (rc)
1334                 goto out;
1335
1336         if (is_thinint_irq(irq_ptr))
1337                 tiqdio_add_input_queues(irq_ptr);
1338
1339         /* wait for subchannel to become active */
1340         msleep(5);
1341
1342         switch (irq_ptr->state) {
1343         case QDIO_IRQ_STATE_STOPPED:
1344         case QDIO_IRQ_STATE_ERR:
1345                 rc = -EIO;
1346                 break;
1347         default:
1348                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1349                 rc = 0;
1350         }
1351 out:
1352         mutex_unlock(&irq_ptr->setup_mutex);
1353         return rc;
1354 }
1355 EXPORT_SYMBOL_GPL(qdio_activate);
1356
1357 static inline int buf_in_between(int bufnr, int start, int count)
1358 {
1359         int end = add_buf(start, count);
1360
1361         if (end > start) {
1362                 if (bufnr >= start && bufnr < end)
1363                         return 1;
1364                 else
1365                         return 0;
1366         }
1367
1368         /* wrap-around case */
1369         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1370             (bufnr < end))
1371                 return 1;
1372         else
1373                 return 0;
1374 }
1375
1376 /**
1377  * handle_inbound - reset processed input buffers
1378  * @q: queue containing the buffers
1379  * @callflags: flags
1380  * @bufnr: first buffer to process
1381  * @count: how many buffers are emptied
1382  */
1383 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1384                           int bufnr, int count)
1385 {
1386         int used, diff;
1387
1388         qperf_inc(q, inbound_call);
1389
1390         if (!q->u.in.polling)
1391                 goto set;
1392
1393         /* protect against stop polling setting an ACK for an emptied slsb */
1394         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1395                 /* overwriting everything, just delete polling status */
1396                 q->u.in.polling = 0;
1397                 q->u.in.ack_count = 0;
1398                 goto set;
1399         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1400                 if (is_qebsm(q)) {
1401                         /* partial overwrite, just update ack_start */
1402                         diff = add_buf(bufnr, count);
1403                         diff = sub_buf(diff, q->u.in.ack_start);
1404                         q->u.in.ack_count -= diff;
1405                         if (q->u.in.ack_count <= 0) {
1406                                 q->u.in.polling = 0;
1407                                 q->u.in.ack_count = 0;
1408                                 goto set;
1409                         }
1410                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1411                 }
1412                 else
1413                         /* the only ACK will be deleted, so stop polling */
1414                         q->u.in.polling = 0;
1415         }
1416
1417 set:
1418         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1419
1420         used = atomic_add_return(count, &q->nr_buf_used) - count;
1421         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1422
1423         /* no need to signal as long as the adapter had free buffers */
1424         if (used)
1425                 return 0;
1426
1427         if (need_siga_in(q))
1428                 return qdio_siga_input(q);
1429         return 0;
1430 }
1431
1432 /**
1433  * handle_outbound - process filled outbound buffers
1434  * @q: queue containing the buffers
1435  * @callflags: flags
1436  * @bufnr: first buffer to process
1437  * @count: how many buffers are filled
1438  */
1439 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1440                            int bufnr, int count)
1441 {
1442         unsigned char state;
1443         int used, rc = 0;
1444
1445         qperf_inc(q, outbound_call);
1446
1447         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1448         used = atomic_add_return(count, &q->nr_buf_used);
1449         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1450
1451         if (used == QDIO_MAX_BUFFERS_PER_Q)
1452                 qperf_inc(q, outbound_queue_full);
1453
1454         if (callflags & QDIO_FLAG_PCI_OUT) {
1455                 q->u.out.pci_out_enabled = 1;
1456                 qperf_inc(q, pci_request_int);
1457         } else
1458                 q->u.out.pci_out_enabled = 0;
1459
1460         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1461                 /* One SIGA-W per buffer required for unicast HiperSockets. */
1462                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1463
1464                 rc = qdio_kick_outbound_q(q);
1465         } else if (need_siga_sync(q)) {
1466                 rc = qdio_siga_sync_q(q);
1467         } else {
1468                 /* try to fast requeue buffers */
1469                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1470                 if (state != SLSB_CU_OUTPUT_PRIMED)
1471                         rc = qdio_kick_outbound_q(q);
1472                 else
1473                         qperf_inc(q, fast_requeue);
1474         }
1475
1476         /* in case of SIGA errors we must process the error immediately */
1477         if (used >= q->u.out.scan_threshold || rc)
1478                 tasklet_schedule(&q->tasklet);
1479         else
1480                 /* free the SBALs in case of no further traffic */
1481                 if (!timer_pending(&q->u.out.timer))
1482                         mod_timer(&q->u.out.timer, jiffies + HZ);
1483         return rc;
1484 }
1485
1486 /**
1487  * do_QDIO - process input or output buffers
1488  * @cdev: associated ccw_device for the qdio subchannel
1489  * @callflags: input or output and special flags from the program
1490  * @q_nr: queue number
1491  * @bufnr: buffer number
1492  * @count: how many buffers to process
1493  */
1494 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1495             int q_nr, unsigned int bufnr, unsigned int count)
1496 {
1497         struct qdio_irq *irq_ptr;
1498
1499         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1500                 return -EINVAL;
1501
1502         irq_ptr = cdev->private->qdio_data;
1503         if (!irq_ptr)
1504                 return -ENODEV;
1505
1506         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1507                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1508
1509         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1510                 return -EBUSY;
1511         if (!count)
1512                 return 0;
1513         if (callflags & QDIO_FLAG_SYNC_INPUT)
1514                 return handle_inbound(irq_ptr->input_qs[q_nr],
1515                                       callflags, bufnr, count);
1516         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1517                 return handle_outbound(irq_ptr->output_qs[q_nr],
1518                                        callflags, bufnr, count);
1519         return -EINVAL;
1520 }
1521 EXPORT_SYMBOL_GPL(do_QDIO);
1522
1523 /**
1524  * qdio_start_irq - process input buffers
1525  * @cdev: associated ccw_device for the qdio subchannel
1526  * @nr: input queue number
1527  *
1528  * Return codes
1529  *   0 - success
1530  *   1 - irqs not started since new data is available
1531  */
1532 int qdio_start_irq(struct ccw_device *cdev, int nr)
1533 {
1534         struct qdio_q *q;
1535         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1536
1537         if (!irq_ptr)
1538                 return -ENODEV;
1539         q = irq_ptr->input_qs[nr];
1540
1541         WARN_ON(queue_irqs_enabled(q));
1542
1543         if (!shared_ind(q->irq_ptr->dsci))
1544                 xchg(q->irq_ptr->dsci, 0);
1545
1546         qdio_stop_polling(q);
1547         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1548
1549         /*
1550          * We need to check again to not lose initiative after
1551          * resetting the ACK state.
1552          */
1553         if (!shared_ind(q->irq_ptr->dsci) && *q->irq_ptr->dsci)
1554                 goto rescan;
1555         if (!qdio_inbound_q_done(q))
1556                 goto rescan;
1557         return 0;
1558
1559 rescan:
1560         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1561                              &q->u.in.queue_irq_state))
1562                 return 0;
1563         else
1564                 return 1;
1565
1566 }
1567 EXPORT_SYMBOL(qdio_start_irq);
1568
1569 /**
1570  * qdio_get_next_buffers - process input buffers
1571  * @cdev: associated ccw_device for the qdio subchannel
1572  * @nr: input queue number
1573  * @bufnr: first filled buffer number
1574  * @error: buffers are in error state
1575  *
1576  * Return codes
1577  *   < 0 - error
1578  *   = 0 - no new buffers found
1579  *   > 0 - number of processed buffers
1580  */
1581 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1582                           int *error)
1583 {
1584         struct qdio_q *q;
1585         int start, end;
1586         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1587
1588         if (!irq_ptr)
1589                 return -ENODEV;
1590         q = irq_ptr->input_qs[nr];
1591         WARN_ON(queue_irqs_enabled(q));
1592
1593         /*
1594          * Cannot rely on automatic sync after interrupt since queues may
1595          * also be examined without interrupt.
1596          */
1597         if (need_siga_sync(q))
1598                 qdio_sync_queues(q);
1599
1600         /* check the PCI capable outbound queues. */
1601         qdio_check_outbound_after_thinint(q);
1602
1603         if (!qdio_inbound_q_moved(q))
1604                 return 0;
1605
1606         /* Note: upper-layer MUST stop processing immediately here ... */
1607         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1608                 return -EIO;
1609
1610         start = q->first_to_kick;
1611         end = q->first_to_check;
1612         *bufnr = start;
1613         *error = q->qdio_error;
1614
1615         /* for the next time */
1616         q->first_to_kick = end;
1617         q->qdio_error = 0;
1618         return sub_buf(end, start);
1619 }
1620 EXPORT_SYMBOL(qdio_get_next_buffers);
1621
1622 /**
1623  * qdio_stop_irq - disable interrupt processing for the device
1624  * @cdev: associated ccw_device for the qdio subchannel
1625  * @nr: input queue number
1626  *
1627  * Return codes
1628  *   0 - interrupts were already disabled
1629  *   1 - interrupts successfully disabled
1630  */
1631 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1632 {
1633         struct qdio_q *q;
1634         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1635
1636         if (!irq_ptr)
1637                 return -ENODEV;
1638         q = irq_ptr->input_qs[nr];
1639
1640         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1641                              &q->u.in.queue_irq_state))
1642                 return 0;
1643         else
1644                 return 1;
1645 }
1646 EXPORT_SYMBOL(qdio_stop_irq);
1647
1648 static int __init init_QDIO(void)
1649 {
1650         int rc;
1651
1652         rc = qdio_setup_init();
1653         if (rc)
1654                 return rc;
1655         rc = tiqdio_allocate_memory();
1656         if (rc)
1657                 goto out_cache;
1658         rc = qdio_debug_init();
1659         if (rc)
1660                 goto out_ti;
1661         rc = tiqdio_register_thinints();
1662         if (rc)
1663                 goto out_debug;
1664         return 0;
1665
1666 out_debug:
1667         qdio_debug_exit();
1668 out_ti:
1669         tiqdio_free_memory();
1670 out_cache:
1671         qdio_setup_exit();
1672         return rc;
1673 }
1674
1675 static void __exit exit_QDIO(void)
1676 {
1677         tiqdio_unregister_thinints();
1678         tiqdio_free_memory();
1679         qdio_debug_exit();
1680         qdio_setup_exit();
1681 }
1682
1683 module_init(init_QDIO);
1684 module_exit(exit_QDIO);