drivers/s390/cio/qdio_main.c

   1 /*
   2  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   3  *
   4  * Copyright IBM Corp. 2000, 2008
   5  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   6  *            Jan Glauber <jang@linux.vnet.ibm.com>
   7  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   8  */
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/timer.h>
  13 #include <linux/delay.h>
  14 #include <linux/gfp.h>
  15 #include <linux/io.h>
  16 #include <linux/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19 #include <asm/ipl.h>
  20
  21 #include "cio.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "qdio.h"
  25 #include "qdio_debug.h"
  26
  27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  28         "Jan Glauber <jang@linux.vnet.ibm.com>");
  29 MODULE_DESCRIPTION("QDIO base support");
  30 MODULE_LICENSE("GPL");
  31
  32 static inline int do_siga_sync(unsigned long schid,
  33                                unsigned int out_mask, unsigned int in_mask,
  34                                unsigned int fc)
  35 {
  36         register unsigned long __fc asm ("0") = fc;
  37         register unsigned long __schid asm ("1") = schid;
  38         register unsigned long out asm ("2") = out_mask;
  39         register unsigned long in asm ("3") = in_mask;
  40         int cc;
  41
  42         asm volatile(
  43                 "       siga    0\n"
  44                 "       ipm     %0\n"
  45                 "       srl     %0,28\n"
  46                 : "=d" (cc)
  47                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  48         return cc;
  49 }
  50
  51 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  52                                 unsigned int fc)
  53 {
  54         register unsigned long __fc asm ("0") = fc;
  55         register unsigned long __schid asm ("1") = schid;
  56         register unsigned long __mask asm ("2") = mask;
  57         int cc;
  58
  59         asm volatile(
  60                 "       siga    0\n"
  61                 "       ipm     %0\n"
  62                 "       srl     %0,28\n"
  63                 : "=d" (cc)
  64                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  65         return cc;
  66 }
  67
  68 /**
  69  * do_siga_output - perform SIGA-w/wt function
  70  * @schid: subchannel id or in case of QEBSM the subchannel token
  71  * @mask: which output queues to process
  72  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  73  * @fc: function code to perform
  74  *
  75  * Returns condition code.
  76  * Note: For IQDC unicast queues only the highest priority queue is processed.
  77  */
  78 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  79                                  unsigned int *bb, unsigned int fc,
  80                                  unsigned long aob)
  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         register unsigned long __aob asm("3") = aob;
  86         int cc;
  87
  88         asm volatile(
  89                 "       siga    0\n"
  90                 "       ipm     %0\n"
  91                 "       srl     %0,28\n"
  92                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  93                 : "d" (__schid), "d" (__mask)
  94                 : "cc");
  95         *bb = __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         /* no buffer processed */
 105         if (ccq == 97)
 106                 return 1;
 107         /* not all buffers processed */
 108         if (ccq == 96)
 109                 return 2;
 110         /* notify devices immediately */
 111         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 112         return -EIO;
 113 }
 114
 115 /**
 116  * qdio_do_eqbs - extract buffer states for QEBSM
 117  * @q: queue to manipulate
 118  * @state: state of the extracted buffers
 119  * @start: buffer number to start at
 120  * @count: count of buffers to examine
 121  * @auto_ack: automatically acknowledge buffers
 122  *
 123  * Returns the number of successfully extracted equal buffer states.
 124  * Stops processing if a state is different from the last buffers state.
 125  */
 126 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 127                         int start, int count, int auto_ack)
 128 {
 129         int rc, tmp_count = count, tmp_start = start, nr = q->nr;
 130         unsigned int ccq = 0;
 131
 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         if (!rc)
 141                 return count - tmp_count;
 142
 143         if (rc == 1) {
 144                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 145                 goto again;
 146         }
 147
 148         if (rc == 2) {
 149                 qperf_inc(q, eqbs_partial);
 150                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
 151                         tmp_count);
 152                 return count - tmp_count;
 153         }
 154
 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, QDIO_ERROR_GET_BUF_STATE,
 158                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 159         return 0;
 160 }
 161
 162 /**
 163  * qdio_do_sqbs - set buffer states for QEBSM
 164  * @q: queue to manipulate
 165  * @state: new state of the buffers
 166  * @start: first buffer number to change
 167  * @count: how many buffers to change
 168  *
 169  * Returns the number of successfully changed buffers.
 170  * Does retrying until the specified count of buffer states is set or an
 171  * error occurs.
 172  */
 173 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 174                         int count)
 175 {
 176         unsigned int ccq = 0;
 177         int tmp_count = count, tmp_start = start;
 178         int nr = q->nr;
 179         int rc;
 180
 181         if (!count)
 182                 return 0;
 183         qperf_inc(q, sqbs);
 184
 185         if (!q->is_input_q)
 186                 nr += q->irq_ptr->nr_input_qs;
 187 again:
 188         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 189         rc = qdio_check_ccq(q, ccq);
 190         if (!rc) {
 191                 WARN_ON_ONCE(tmp_count);
 192                 return count - tmp_count;
 193         }
 194
 195         if (rc == 1 || rc == 2) {
 196                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 197                 qperf_inc(q, sqbs_partial);
 198                 goto again;
 199         }
 200
 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, QDIO_ERROR_SET_BUF_STATE,
 204                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 205         return 0;
 206 }
 207
 208 /*
 209  * Returns number of examined buffers and their common state in *state.
 210  * Requested number of buffers-to-examine must be > 0.
 211  */
 212 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 213                                  unsigned char *state, unsigned int count,
 214                                  int auto_ack, int merge_pending)
 215 {
 216         unsigned char __state = 0;
 217         int i;
 218
 219         if (is_qebsm(q))
 220                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 221
 222         /* get initial state: */
 223         __state = q->slsb.val[bufnr];
 224         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 225                 __state = SLSB_P_OUTPUT_EMPTY;
 226
 227         for (i = 1; i < count; i++) {
 228                 bufnr = next_buf(bufnr);
 229
 230                 /* merge PENDING into EMPTY: */
 231                 if (merge_pending &&
 232                     q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING &&
 233                     __state == SLSB_P_OUTPUT_EMPTY)
 234                         continue;
 235
 236                 /* stop if next state differs from initial state: */
 237                 if (q->slsb.val[bufnr] != __state)
 238                         break;
 239         }
 240         *state = __state;
 241         return i;
 242 }
 243
 244 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 245                                 unsigned char *state, int auto_ack)
 246 {
 247         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 248 }
 249
 250 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 251 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 252                                  unsigned char state, int count)
 253 {
 254         int i;
 255
 256         if (is_qebsm(q))
 257                 return qdio_do_sqbs(q, state, bufnr, count);
 258
 259         for (i = 0; i < count; i++) {
 260                 xchg(&q->slsb.val[bufnr], state);
 261                 bufnr = next_buf(bufnr);
 262         }
 263         return count;
 264 }
 265
 266 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 267                                 unsigned char state)
 268 {
 269         return set_buf_states(q, bufnr, state, 1);
 270 }
 271
 272 /* set slsb states to initial state */
 273 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 274 {
 275         struct qdio_q *q;
 276         int i;
 277
 278         for_each_input_queue(irq_ptr, q, i)
 279                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 280                                QDIO_MAX_BUFFERS_PER_Q);
 281         for_each_output_queue(irq_ptr, q, i)
 282                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 283                                QDIO_MAX_BUFFERS_PER_Q);
 284 }
 285
 286 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 287                           unsigned int input)
 288 {
 289         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 290         unsigned int fc = QDIO_SIGA_SYNC;
 291         int cc;
 292
 293         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 294         qperf_inc(q, siga_sync);
 295
 296         if (is_qebsm(q)) {
 297                 schid = q->irq_ptr->sch_token;
 298                 fc |= QDIO_SIGA_QEBSM_FLAG;
 299         }
 300
 301         cc = do_siga_sync(schid, output, input, fc);
 302         if (unlikely(cc))
 303                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 304         return (cc) ? -EIO : 0;
 305 }
 306
 307 static inline int qdio_siga_sync_q(struct qdio_q *q)
 308 {
 309         if (q->is_input_q)
 310                 return qdio_siga_sync(q, 0, q->mask);
 311         else
 312                 return qdio_siga_sync(q, q->mask, 0);
 313 }
 314
 315 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
 316         unsigned long aob)
 317 {
 318         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 319         unsigned int fc = QDIO_SIGA_WRITE;
 320         u64 start_time = 0;
 321         int retries = 0, cc;
 322         unsigned long laob = 0;
 323
 324         WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
 325                              !q->u.out.use_cq));
 326         if (q->u.out.use_cq && aob != 0) {
 327                 fc = QDIO_SIGA_WRITEQ;
 328                 laob = aob;
 329         }
 330
 331         if (is_qebsm(q)) {
 332                 schid = q->irq_ptr->sch_token;
 333                 fc |= QDIO_SIGA_QEBSM_FLAG;
 334         }
 335 again:
 336         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
 337
 338         /* hipersocket busy condition */
 339         if (unlikely(*busy_bit)) {
 340                 retries++;
 341
 342                 if (!start_time) {
 343                         start_time = get_tod_clock_fast();
 344                         goto again;
 345                 }
 346                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 347                         goto again;
 348         }
 349         if (retries) {
 350                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 351                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 352                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 353         }
 354         return cc;
 355 }
 356
 357 static inline int qdio_siga_input(struct qdio_q *q)
 358 {
 359         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 360         unsigned int fc = QDIO_SIGA_READ;
 361         int cc;
 362
 363         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 364         qperf_inc(q, siga_read);
 365
 366         if (is_qebsm(q)) {
 367                 schid = q->irq_ptr->sch_token;
 368                 fc |= QDIO_SIGA_QEBSM_FLAG;
 369         }
 370
 371         cc = do_siga_input(schid, q->mask, fc);
 372         if (unlikely(cc))
 373                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 374         return (cc) ? -EIO : 0;
 375 }
 376
 377 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 378 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 379
 380 static inline void qdio_sync_queues(struct qdio_q *q)
 381 {
 382         /* PCI capable outbound queues will also be scanned so sync them too */
 383         if (pci_out_supported(q))
 384                 qdio_siga_sync_all(q);
 385         else
 386                 qdio_siga_sync_q(q);
 387 }
 388
 389 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 390                         unsigned char *state)
 391 {
 392         if (need_siga_sync(q))
 393                 qdio_siga_sync_q(q);
 394         return get_buf_states(q, bufnr, state, 1, 0, 0);
 395 }
 396
 397 static inline void qdio_stop_polling(struct qdio_q *q)
 398 {
 399         if (!q->u.in.polling)
 400                 return;
 401
 402         q->u.in.polling = 0;
 403         qperf_inc(q, stop_polling);
 404
 405         /* show the card that we are not polling anymore */
 406         if (is_qebsm(q)) {
 407                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 408                                q->u.in.ack_count);
 409                 q->u.in.ack_count = 0;
 410         } else
 411                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 412 }
 413
 414 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 415 {
 416         int pos;
 417
 418         q->q_stats.nr_sbal_total += count;
 419         if (count == QDIO_MAX_BUFFERS_MASK) {
 420                 q->q_stats.nr_sbals[7]++;
 421                 return;
 422         }
 423         pos = ilog2(count);
 424         q->q_stats.nr_sbals[pos]++;
 425 }
 426
 427 static void process_buffer_error(struct qdio_q *q, int count)
 428 {
 429         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 430                                         SLSB_P_OUTPUT_NOT_INIT;
 431
 432         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 433
 434         /* special handling for no target buffer empty */
 435         if ((!q->is_input_q &&
 436             (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
 437                 qperf_inc(q, target_full);
 438                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 439                               q->first_to_check);
 440                 goto set;
 441         }
 442
 443         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 444         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 445         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 446         DBF_ERROR("F14:%2x F15:%2x",
 447                   q->sbal[q->first_to_check]->element[14].sflags,
 448                   q->sbal[q->first_to_check]->element[15].sflags);
 449
 450 set:
 451         /*
 452          * Interrupts may be avoided as long as the error is present
 453          * so change the buffer state immediately to avoid starvation.
 454          */
 455         set_buf_states(q, q->first_to_check, state, count);
 456 }
 457
 458 static inline void inbound_primed(struct qdio_q *q, int count)
 459 {
 460         int new;
 461
 462         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count);
 463
 464         /* for QEBSM the ACK was already set by EQBS */
 465         if (is_qebsm(q)) {
 466                 if (!q->u.in.polling) {
 467                         q->u.in.polling = 1;
 468                         q->u.in.ack_count = count;
 469                         q->u.in.ack_start = q->first_to_check;
 470                         return;
 471                 }
 472
 473                 /* delete the previous ACK's */
 474                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 475                                q->u.in.ack_count);
 476                 q->u.in.ack_count = count;
 477                 q->u.in.ack_start = q->first_to_check;
 478                 return;
 479         }
 480
 481         /*
 482          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 483          * or by the next inbound run.
 484          */
 485         new = add_buf(q->first_to_check, count - 1);
 486         if (q->u.in.polling) {
 487                 /* reset the previous ACK but first set the new one */
 488                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 489                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 490         } else {
 491                 q->u.in.polling = 1;
 492                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 493         }
 494
 495         q->u.in.ack_start = new;
 496         count--;
 497         if (!count)
 498                 return;
 499         /* need to change ALL buffers to get more interrupts */
 500         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 501 }
 502
 503 static int get_inbound_buffer_frontier(struct qdio_q *q)
 504 {
 505         int count, stop;
 506         unsigned char state = 0;
 507
 508         q->timestamp = get_tod_clock_fast();
 509
 510         /*
 511          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 512          * would return 0.
 513          */
 514         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 515         stop = add_buf(q->first_to_check, count);
 516
 517         if (q->first_to_check == stop)
 518                 goto out;
 519
 520         /*
 521          * No siga sync here, as a PCI or we after a thin interrupt
 522          * already sync'ed the queues.
 523          */
 524         count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
 525         if (!count)
 526                 goto out;
 527
 528         switch (state) {
 529         case SLSB_P_INPUT_PRIMED:
 530                 inbound_primed(q, count);
 531                 q->first_to_check = add_buf(q->first_to_check, count);
 532                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 533                         qperf_inc(q, inbound_queue_full);
 534                 if (q->irq_ptr->perf_stat_enabled)
 535                         account_sbals(q, count);
 536                 break;
 537         case SLSB_P_INPUT_ERROR:
 538                 process_buffer_error(q, count);
 539                 q->first_to_check = add_buf(q->first_to_check, count);
 540                 atomic_sub(count, &q->nr_buf_used);
 541                 if (q->irq_ptr->perf_stat_enabled)
 542                         account_sbals_error(q, count);
 543                 break;
 544         case SLSB_CU_INPUT_EMPTY:
 545         case SLSB_P_INPUT_NOT_INIT:
 546         case SLSB_P_INPUT_ACK:
 547                 if (q->irq_ptr->perf_stat_enabled)
 548                         q->q_stats.nr_sbal_nop++;
 549                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 550                         q->nr, q->first_to_check);
 551                 break;
 552         default:
 553                 WARN_ON_ONCE(1);
 554         }
 555 out:
 556         return q->first_to_check;
 557 }
 558
 559 static int qdio_inbound_q_moved(struct qdio_q *q)
 560 {
 561         int bufnr;
 562
 563         bufnr = get_inbound_buffer_frontier(q);
 564
 565         if (bufnr != q->last_move) {
 566                 q->last_move = bufnr;
 567                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 568                         q->u.in.timestamp = get_tod_clock();
 569                 return 1;
 570         } else
 571                 return 0;
 572 }
 573
 574 static inline int qdio_inbound_q_done(struct qdio_q *q)
 575 {
 576         unsigned char state = 0;
 577
 578         if (!atomic_read(&q->nr_buf_used))
 579                 return 1;
 580
 581         if (need_siga_sync(q))
 582                 qdio_siga_sync_q(q);
 583         get_buf_state(q, q->first_to_check, &state, 0);
 584
 585         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 586                 /* more work coming */
 587                 return 0;
 588
 589         if (is_thinint_irq(q->irq_ptr))
 590                 return 1;
 591
 592         /* don't poll under z/VM */
 593         if (MACHINE_IS_VM)
 594                 return 1;
 595
 596         /*
 597          * At this point we know, that inbound first_to_check
 598          * has (probably) not moved (see qdio_inbound_processing).
 599          */
 600         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 601                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 602                               q->first_to_check);
 603                 return 1;
 604         } else
 605                 return 0;
 606 }
 607
 608 static inline int contains_aobs(struct qdio_q *q)
 609 {
 610         return !q->is_input_q && q->u.out.use_cq;
 611 }
 612
 613 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 614 {
 615         unsigned char state = 0;
 616         int j, b = start;
 617
 618         if (!contains_aobs(q))
 619                 return;
 620
 621         for (j = 0; j < count; ++j) {
 622                 get_buf_state(q, b, &state, 0);
 623                 if (state == SLSB_P_OUTPUT_PENDING) {
 624                         struct qaob *aob = q->u.out.aobs[b];
 625                         if (aob == NULL)
 626                                 continue;
 627
 628                         q->u.out.sbal_state[b].flags |=
 629                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 630                         q->u.out.aobs[b] = NULL;
 631                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
 632                         q->u.out.sbal_state[b].aob = NULL;
 633                 }
 634                 b = next_buf(b);
 635         }
 636 }
 637
 638 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 639                                         int bufnr)
 640 {
 641         unsigned long phys_aob = 0;
 642
 643         if (!q->use_cq)
 644                 return 0;
 645
 646         if (!q->aobs[bufnr]) {
 647                 struct qaob *aob = qdio_allocate_aob();
 648                 q->aobs[bufnr] = aob;
 649         }
 650         if (q->aobs[bufnr]) {
 651                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
 652                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 653                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 654                 WARN_ON_ONCE(phys_aob & 0xFF);
 655         }
 656
 657         q->sbal_state[bufnr].flags = 0;
 658         return phys_aob;
 659 }
 660
 661 static void qdio_kick_handler(struct qdio_q *q)
 662 {
 663         int start = q->first_to_kick;
 664         int end = q->first_to_check;
 665         int count;
 666
 667         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 668                 return;
 669
 670         count = sub_buf(end, start);
 671
 672         if (q->is_input_q) {
 673                 qperf_inc(q, inbound_handler);
 674                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 675         } else {
 676                 qperf_inc(q, outbound_handler);
 677                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 678                               start, count);
 679         }
 680
 681         qdio_handle_aobs(q, start, count);
 682
 683         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 684                    q->irq_ptr->int_parm);
 685
 686         /* for the next time */
 687         q->first_to_kick = end;
 688         q->qdio_error = 0;
 689 }
 690
 691 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 692 {
 693         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 694                 tasklet_schedule(&q->tasklet);
 695                 return 0;
 696         }
 697         return -EPERM;
 698 }
 699
 700 static void __qdio_inbound_processing(struct qdio_q *q)
 701 {
 702         qperf_inc(q, tasklet_inbound);
 703
 704         if (!qdio_inbound_q_moved(q))
 705                 return;
 706
 707         qdio_kick_handler(q);
 708
 709         if (!qdio_inbound_q_done(q)) {
 710                 /* means poll time is not yet over */
 711                 qperf_inc(q, tasklet_inbound_resched);
 712                 if (!qdio_tasklet_schedule(q))
 713                         return;
 714         }
 715
 716         qdio_stop_polling(q);
 717         /*
 718          * We need to check again to not lose initiative after
 719          * resetting the ACK state.
 720          */
 721         if (!qdio_inbound_q_done(q)) {
 722                 qperf_inc(q, tasklet_inbound_resched2);
 723                 qdio_tasklet_schedule(q);
 724         }
 725 }
 726
 727 void qdio_inbound_processing(unsigned long data)
 728 {
 729         struct qdio_q *q = (struct qdio_q *)data;
 730         __qdio_inbound_processing(q);
 731 }
 732
 733 static int get_outbound_buffer_frontier(struct qdio_q *q)
 734 {
 735         int count, stop;
 736         unsigned char state = 0;
 737
 738         q->timestamp = get_tod_clock_fast();
 739
 740         if (need_siga_sync(q))
 741                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 742                     !pci_out_supported(q)) ||
 743                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 744                     multicast_outbound(q)))
 745                         qdio_siga_sync_q(q);
 746
 747         /*
 748          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 749          * would return 0.
 750          */
 751         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 752         stop = add_buf(q->first_to_check, count);
 753         if (q->first_to_check == stop)
 754                 goto out;
 755
 756         count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
 757         if (!count)
 758                 goto out;
 759
 760         switch (state) {
 761         case SLSB_P_OUTPUT_EMPTY:
 762         case SLSB_P_OUTPUT_PENDING:
 763                 /* the adapter got it */
 764                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 765                         "out empty:%1d %02x", q->nr, count);
 766
 767                 atomic_sub(count, &q->nr_buf_used);
 768                 q->first_to_check = add_buf(q->first_to_check, count);
 769                 if (q->irq_ptr->perf_stat_enabled)
 770                         account_sbals(q, count);
 771
 772                 break;
 773         case SLSB_P_OUTPUT_ERROR:
 774                 process_buffer_error(q, count);
 775                 q->first_to_check = add_buf(q->first_to_check, count);
 776                 atomic_sub(count, &q->nr_buf_used);
 777                 if (q->irq_ptr->perf_stat_enabled)
 778                         account_sbals_error(q, count);
 779                 break;
 780         case SLSB_CU_OUTPUT_PRIMED:
 781                 /* the adapter has not fetched the output yet */
 782                 if (q->irq_ptr->perf_stat_enabled)
 783                         q->q_stats.nr_sbal_nop++;
 784                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 785                               q->nr);
 786                 break;
 787         case SLSB_P_OUTPUT_NOT_INIT:
 788         case SLSB_P_OUTPUT_HALTED:
 789                 break;
 790         default:
 791                 WARN_ON_ONCE(1);
 792         }
 793
 794 out:
 795         return q->first_to_check;
 796 }
 797
 798 /* all buffers processed? */
 799 static inline int qdio_outbound_q_done(struct qdio_q *q)
 800 {
 801         return atomic_read(&q->nr_buf_used) == 0;
 802 }
 803
 804 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 805 {
 806         int bufnr;
 807
 808         bufnr = get_outbound_buffer_frontier(q);
 809
 810         if (bufnr != q->last_move) {
 811                 q->last_move = bufnr;
 812                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 813                 return 1;
 814         } else
 815                 return 0;
 816 }
 817
 818 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 819 {
 820         int retries = 0, cc;
 821         unsigned int busy_bit;
 822
 823         if (!need_siga_out(q))
 824                 return 0;
 825
 826         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 827 retry:
 828         qperf_inc(q, siga_write);
 829
 830         cc = qdio_siga_output(q, &busy_bit, aob);
 831         switch (cc) {
 832         case 0:
 833                 break;
 834         case 2:
 835                 if (busy_bit) {
 836                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 837                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 838                                 goto retry;
 839                         }
 840                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 841                         cc = -EBUSY;
 842                 } else {
 843                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 844                         cc = -ENOBUFS;
 845                 }
 846                 break;
 847         case 1:
 848         case 3:
 849                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 850                 cc = -EIO;
 851                 break;
 852         }
 853         if (retries) {
 854                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 855                 DBF_ERROR("count:%u", retries);
 856         }
 857         return cc;
 858 }
 859
 860 static void __qdio_outbound_processing(struct qdio_q *q)
 861 {
 862         qperf_inc(q, tasklet_outbound);
 863         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 864
 865         if (qdio_outbound_q_moved(q))
 866                 qdio_kick_handler(q);
 867
 868         if (queue_type(q) == QDIO_ZFCP_QFMT)
 869                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 870                         goto sched;
 871
 872         if (q->u.out.pci_out_enabled)
 873                 return;
 874
 875         /*
 876          * Now we know that queue type is either qeth without pci enabled
 877          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 878          * is noticed and outbound_handler is called after some time.
 879          */
 880         if (qdio_outbound_q_done(q))
 881                 del_timer_sync(&q->u.out.timer);
 882         else
 883                 if (!timer_pending(&q->u.out.timer) &&
 884                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 885                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 886         return;
 887
 888 sched:
 889         qdio_tasklet_schedule(q);
 890 }
 891
 892 /* outbound tasklet */
 893 void qdio_outbound_processing(unsigned long data)
 894 {
 895         struct qdio_q *q = (struct qdio_q *)data;
 896         __qdio_outbound_processing(q);
 897 }
 898
 899 void qdio_outbound_timer(unsigned long data)
 900 {
 901         struct qdio_q *q = (struct qdio_q *)data;
 902
 903         qdio_tasklet_schedule(q);
 904 }
 905
 906 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 907 {
 908         struct qdio_q *out;
 909         int i;
 910
 911         if (!pci_out_supported(q))
 912                 return;
 913
 914         for_each_output_queue(q->irq_ptr, out, i)
 915                 if (!qdio_outbound_q_done(out))
 916                         qdio_tasklet_schedule(out);
 917 }
 918
 919 static void __tiqdio_inbound_processing(struct qdio_q *q)
 920 {
 921         qperf_inc(q, tasklet_inbound);
 922         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 923                 qdio_sync_queues(q);
 924
 925         /*
 926          * The interrupt could be caused by a PCI request. Check the
 927          * PCI capable outbound queues.
 928          */
 929         qdio_check_outbound_after_thinint(q);
 930
 931         if (!qdio_inbound_q_moved(q))
 932                 return;
 933
 934         qdio_kick_handler(q);
 935
 936         if (!qdio_inbound_q_done(q)) {
 937                 qperf_inc(q, tasklet_inbound_resched);
 938                 if (!qdio_tasklet_schedule(q))
 939                         return;
 940         }
 941
 942         qdio_stop_polling(q);
 943         /*
 944          * We need to check again to not lose initiative after
 945          * resetting the ACK state.
 946          */
 947         if (!qdio_inbound_q_done(q)) {
 948                 qperf_inc(q, tasklet_inbound_resched2);
 949                 qdio_tasklet_schedule(q);
 950         }
 951 }
 952
 953 void tiqdio_inbound_processing(unsigned long data)
 954 {
 955         struct qdio_q *q = (struct qdio_q *)data;
 956         __tiqdio_inbound_processing(q);
 957 }
 958
 959 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 960                                   enum qdio_irq_states state)
 961 {
 962         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 963
 964         irq_ptr->state = state;
 965         mb();
 966 }
 967
 968 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 969 {
 970         if (irb->esw.esw0.erw.cons) {
 971                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 972                 DBF_ERROR_HEX(irb, 64);
 973                 DBF_ERROR_HEX(irb->ecw, 64);
 974         }
 975 }
 976
 977 /* PCI interrupt handler */
 978 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 979 {
 980         int i;
 981         struct qdio_q *q;
 982
 983         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 984                 return;
 985
 986         for_each_input_queue(irq_ptr, q, i) {
 987                 if (q->u.in.queue_start_poll) {
 988                         /* skip if polling is enabled or already in work */
 989                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 990                                      &q->u.in.queue_irq_state)) {
 991                                 qperf_inc(q, int_discarded);
 992                                 continue;
 993                         }
 994                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 995                                                  q->irq_ptr->int_parm);
 996                 } else {
 997                         tasklet_schedule(&q->tasklet);
 998                 }
 999         }
1000
1001         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
1002                 return;
1003
1004         for_each_output_queue(irq_ptr, q, i) {
1005                 if (qdio_outbound_q_done(q))
1006                         continue;
1007                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1008                         qdio_siga_sync_q(q);
1009                 qdio_tasklet_schedule(q);
1010         }
1011 }
1012
1013 static void qdio_handle_activate_check(struct ccw_device *cdev,
1014                                 unsigned long intparm, int cstat, int dstat)
1015 {
1016         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1017         struct qdio_q *q;
1018         int count;
1019
1020         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1021         DBF_ERROR("intp :%lx", intparm);
1022         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1023
1024         if (irq_ptr->nr_input_qs) {
1025                 q = irq_ptr->input_qs[0];
1026         } else if (irq_ptr->nr_output_qs) {
1027                 q = irq_ptr->output_qs[0];
1028         } else {
1029                 dump_stack();
1030                 goto no_handler;
1031         }
1032
1033         count = sub_buf(q->first_to_check, q->first_to_kick);
1034         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1035                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1036 no_handler:
1037         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1038         /*
1039          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1040          * Therefore we call the LGR detection function here.
1041          */
1042         lgr_info_log();
1043 }
1044
1045 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1046                                       int dstat)
1047 {
1048         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1049
1050         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1051
1052         if (cstat)
1053                 goto error;
1054         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1055                 goto error;
1056         if (!(dstat & DEV_STAT_DEV_END))
1057                 goto error;
1058         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1059         return;
1060
1061 error:
1062         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1063         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1064         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1065 }
1066
1067 /* qdio interrupt handler */
1068 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1069                       struct irb *irb)
1070 {
1071         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1072         struct subchannel_id schid;
1073         int cstat, dstat;
1074
1075         if (!intparm || !irq_ptr) {
1076                 ccw_device_get_schid(cdev, &schid);
1077                 DBF_ERROR("qint:%4x", schid.sch_no);
1078                 return;
1079         }
1080
1081         if (irq_ptr->perf_stat_enabled)
1082                 irq_ptr->perf_stat.qdio_int++;
1083
1084         if (IS_ERR(irb)) {
1085                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1086                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1087                 wake_up(&cdev->private->wait_q);
1088                 return;
1089         }
1090         qdio_irq_check_sense(irq_ptr, irb);
1091         cstat = irb->scsw.cmd.cstat;
1092         dstat = irb->scsw.cmd.dstat;
1093
1094         switch (irq_ptr->state) {
1095         case QDIO_IRQ_STATE_INACTIVE:
1096                 qdio_establish_handle_irq(cdev, cstat, dstat);
1097                 break;
1098         case QDIO_IRQ_STATE_CLEANUP:
1099                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1100                 break;
1101         case QDIO_IRQ_STATE_ESTABLISHED:
1102         case QDIO_IRQ_STATE_ACTIVE:
1103                 if (cstat & SCHN_STAT_PCI) {
1104                         qdio_int_handler_pci(irq_ptr);
1105                         return;
1106                 }
1107                 if (cstat || dstat)
1108                         qdio_handle_activate_check(cdev, intparm, cstat,
1109                                                    dstat);
1110                 break;
1111         case QDIO_IRQ_STATE_STOPPED:
1112                 break;
1113         default:
1114                 WARN_ON_ONCE(1);
1115         }
1116         wake_up(&cdev->private->wait_q);
1117 }
1118
1119 /**
1120  * qdio_get_ssqd_desc - get qdio subchannel description
1121  * @cdev: ccw device to get description for
1122  * @data: where to store the ssqd
1123  *
1124  * Returns 0 or an error code. The results of the chsc are stored in the
1125  * specified structure.
1126  */
1127 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1128                        struct qdio_ssqd_desc *data)
1129 {
1130         struct subchannel_id schid;
1131
1132         if (!cdev || !cdev->private)
1133                 return -EINVAL;
1134
1135         ccw_device_get_schid(cdev, &schid);
1136         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1137         return qdio_setup_get_ssqd(NULL, &schid, data);
1138 }
1139 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1140
1141 static void qdio_shutdown_queues(struct ccw_device *cdev)
1142 {
1143         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1144         struct qdio_q *q;
1145         int i;
1146
1147         for_each_input_queue(irq_ptr, q, i)
1148                 tasklet_kill(&q->tasklet);
1149
1150         for_each_output_queue(irq_ptr, q, i) {
1151                 del_timer_sync(&q->u.out.timer);
1152                 tasklet_kill(&q->tasklet);
1153         }
1154 }
1155
1156 /**
1157  * qdio_shutdown - shut down a qdio subchannel
1158  * @cdev: associated ccw device
1159  * @how: use halt or clear to shutdown
1160  */
1161 int qdio_shutdown(struct ccw_device *cdev, int how)
1162 {
1163         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1164         struct subchannel_id schid;
1165         int rc;
1166
1167         if (!irq_ptr)
1168                 return -ENODEV;
1169
1170         WARN_ON_ONCE(irqs_disabled());
1171         ccw_device_get_schid(cdev, &schid);
1172         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1173
1174         mutex_lock(&irq_ptr->setup_mutex);
1175         /*
1176          * Subchannel was already shot down. We cannot prevent being called
1177          * twice since cio may trigger a shutdown asynchronously.
1178          */
1179         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1180                 mutex_unlock(&irq_ptr->setup_mutex);
1181                 return 0;
1182         }
1183
1184         /*
1185          * Indicate that the device is going down. Scheduling the queue
1186          * tasklets is forbidden from here on.
1187          */
1188         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1189
1190         tiqdio_remove_input_queues(irq_ptr);
1191         qdio_shutdown_queues(cdev);
1192         qdio_shutdown_debug_entries(irq_ptr);
1193
1194         /* cleanup subchannel */
1195         spin_lock_irq(get_ccwdev_lock(cdev));
1196
1197         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1198                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1199         else
1200                 /* default behaviour is halt */
1201                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1202         if (rc) {
1203                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1204                 DBF_ERROR("rc:%4d", rc);
1205                 goto no_cleanup;
1206         }
1207
1208         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1209         spin_unlock_irq(get_ccwdev_lock(cdev));
1210         wait_event_interruptible_timeout(cdev->private->wait_q,
1211                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1212                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1213                 10 * HZ);
1214         spin_lock_irq(get_ccwdev_lock(cdev));
1215
1216 no_cleanup:
1217         qdio_shutdown_thinint(irq_ptr);
1218
1219         /* restore interrupt handler */
1220         if ((void *)cdev->handler == (void *)qdio_int_handler)
1221                 cdev->handler = irq_ptr->orig_handler;
1222         spin_unlock_irq(get_ccwdev_lock(cdev));
1223
1224         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1225         mutex_unlock(&irq_ptr->setup_mutex);
1226         if (rc)
1227                 return rc;
1228         return 0;
1229 }
1230 EXPORT_SYMBOL_GPL(qdio_shutdown);
1231
1232 /**
1233  * qdio_free - free data structures for a qdio subchannel
1234  * @cdev: associated ccw device
1235  */
1236 int qdio_free(struct ccw_device *cdev)
1237 {
1238         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1239         struct subchannel_id schid;
1240
1241         if (!irq_ptr)
1242                 return -ENODEV;
1243
1244         ccw_device_get_schid(cdev, &schid);
1245         DBF_EVENT("qfree:%4x", schid.sch_no);
1246         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1247         mutex_lock(&irq_ptr->setup_mutex);
1248
1249         irq_ptr->debug_area = NULL;
1250         cdev->private->qdio_data = NULL;
1251         mutex_unlock(&irq_ptr->setup_mutex);
1252
1253         qdio_release_memory(irq_ptr);
1254         return 0;
1255 }
1256 EXPORT_SYMBOL_GPL(qdio_free);
1257
1258 /**
1259  * qdio_allocate - allocate qdio queues and associated data
1260  * @init_data: initialization data
1261  */
1262 int qdio_allocate(struct qdio_initialize *init_data)
1263 {
1264         struct subchannel_id schid;
1265         struct qdio_irq *irq_ptr;
1266
1267         ccw_device_get_schid(init_data->cdev, &schid);
1268         DBF_EVENT("qallocate:%4x", schid.sch_no);
1269
1270         if ((init_data->no_input_qs && !init_data->input_handler) ||
1271             (init_data->no_output_qs && !init_data->output_handler))
1272                 return -EINVAL;
1273
1274         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1275             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1276                 return -EINVAL;
1277
1278         if ((!init_data->input_sbal_addr_array) ||
1279             (!init_data->output_sbal_addr_array))
1280                 return -EINVAL;
1281
1282         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1283         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1284         if (!irq_ptr)
1285                 goto out_err;
1286
1287         mutex_init(&irq_ptr->setup_mutex);
1288         if (qdio_allocate_dbf(init_data, irq_ptr))
1289                 goto out_rel;
1290
1291         /*
1292          * Allocate a page for the chsc calls in qdio_establish.
1293          * Must be pre-allocated since a zfcp recovery will call
1294          * qdio_establish. In case of low memory and swap on a zfcp disk
1295          * we may not be able to allocate memory otherwise.
1296          */
1297         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1298         if (!irq_ptr->chsc_page)
1299                 goto out_rel;
1300
1301         /* qdr is used in ccw1.cda which is u32 */
1302         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1303         if (!irq_ptr->qdr)
1304                 goto out_rel;
1305
1306         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1307                              init_data->no_output_qs))
1308                 goto out_rel;
1309
1310         init_data->cdev->private->qdio_data = irq_ptr;
1311         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1312         return 0;
1313 out_rel:
1314         qdio_release_memory(irq_ptr);
1315 out_err:
1316         return -ENOMEM;
1317 }
1318 EXPORT_SYMBOL_GPL(qdio_allocate);
1319
1320 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1321 {
1322         struct qdio_q *q = irq_ptr->input_qs[0];
1323         int i, use_cq = 0;
1324
1325         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1326                 use_cq = 1;
1327
1328         for_each_output_queue(irq_ptr, q, i) {
1329                 if (use_cq) {
1330                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1331                                 use_cq = 0;
1332                                 continue;
1333                         }
1334                 } else
1335                         qdio_disable_async_operation(&q->u.out);
1336         }
1337         DBF_EVENT("use_cq:%d", use_cq);
1338 }
1339
1340 /**
1341  * qdio_establish - establish queues on a qdio subchannel
1342  * @init_data: initialization data
1343  */
1344 int qdio_establish(struct qdio_initialize *init_data)
1345 {
1346         struct ccw_device *cdev = init_data->cdev;
1347         struct subchannel_id schid;
1348         struct qdio_irq *irq_ptr;
1349         int rc;
1350
1351         ccw_device_get_schid(cdev, &schid);
1352         DBF_EVENT("qestablish:%4x", schid.sch_no);
1353
1354         irq_ptr = cdev->private->qdio_data;
1355         if (!irq_ptr)
1356                 return -ENODEV;
1357
1358         mutex_lock(&irq_ptr->setup_mutex);
1359         qdio_setup_irq(init_data);
1360
1361         rc = qdio_establish_thinint(irq_ptr);
1362         if (rc) {
1363                 mutex_unlock(&irq_ptr->setup_mutex);
1364                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1365                 return rc;
1366         }
1367
1368         /* establish q */
1369         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1370         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1371         irq_ptr->ccw.count = irq_ptr->equeue.count;
1372         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1373
1374         spin_lock_irq(get_ccwdev_lock(cdev));
1375         ccw_device_set_options_mask(cdev, 0);
1376
1377         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1378         spin_unlock_irq(get_ccwdev_lock(cdev));
1379         if (rc) {
1380                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1381                 DBF_ERROR("rc:%4x", rc);
1382                 mutex_unlock(&irq_ptr->setup_mutex);
1383                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1384                 return rc;
1385         }
1386
1387         wait_event_interruptible_timeout(cdev->private->wait_q,
1388                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1389                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1390
1391         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1392                 mutex_unlock(&irq_ptr->setup_mutex);
1393                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1394                 return -EIO;
1395         }
1396
1397         qdio_setup_ssqd_info(irq_ptr);
1398
1399         qdio_detect_hsicq(irq_ptr);
1400
1401         /* qebsm is now setup if available, initialize buffer states */
1402         qdio_init_buf_states(irq_ptr);
1403
1404         mutex_unlock(&irq_ptr->setup_mutex);
1405         qdio_print_subchannel_info(irq_ptr, cdev);
1406         qdio_setup_debug_entries(irq_ptr, cdev);
1407         return 0;
1408 }
1409 EXPORT_SYMBOL_GPL(qdio_establish);
1410
1411 /**
1412  * qdio_activate - activate queues on a qdio subchannel
1413  * @cdev: associated cdev
1414  */
1415 int qdio_activate(struct ccw_device *cdev)
1416 {
1417         struct subchannel_id schid;
1418         struct qdio_irq *irq_ptr;
1419         int rc;
1420
1421         ccw_device_get_schid(cdev, &schid);
1422         DBF_EVENT("qactivate:%4x", schid.sch_no);
1423
1424         irq_ptr = cdev->private->qdio_data;
1425         if (!irq_ptr)
1426                 return -ENODEV;
1427
1428         mutex_lock(&irq_ptr->setup_mutex);
1429         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1430                 rc = -EBUSY;
1431                 goto out;
1432         }
1433
1434         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1435         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1436         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1437         irq_ptr->ccw.cda = 0;
1438
1439         spin_lock_irq(get_ccwdev_lock(cdev));
1440         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1441
1442         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1443                               0, DOIO_DENY_PREFETCH);
1444         spin_unlock_irq(get_ccwdev_lock(cdev));
1445         if (rc) {
1446                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1447                 DBF_ERROR("rc:%4x", rc);
1448                 goto out;
1449         }
1450
1451         if (is_thinint_irq(irq_ptr))
1452                 tiqdio_add_input_queues(irq_ptr);
1453
1454         /* wait for subchannel to become active */
1455         msleep(5);
1456
1457         switch (irq_ptr->state) {
1458         case QDIO_IRQ_STATE_STOPPED:
1459         case QDIO_IRQ_STATE_ERR:
1460                 rc = -EIO;
1461                 break;
1462         default:
1463                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1464                 rc = 0;
1465         }
1466 out:
1467         mutex_unlock(&irq_ptr->setup_mutex);
1468         return rc;
1469 }
1470 EXPORT_SYMBOL_GPL(qdio_activate);
1471
1472 static inline int buf_in_between(int bufnr, int start, int count)
1473 {
1474         int end = add_buf(start, count);
1475
1476         if (end > start) {
1477                 if (bufnr >= start && bufnr < end)
1478                         return 1;
1479                 else
1480                         return 0;
1481         }
1482
1483         /* wrap-around case */
1484         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1485             (bufnr < end))
1486                 return 1;
1487         else
1488                 return 0;
1489 }
1490
1491 /**
1492  * handle_inbound - reset processed input buffers
1493  * @q: queue containing the buffers
1494  * @callflags: flags
1495  * @bufnr: first buffer to process
1496  * @count: how many buffers are emptied
1497  */
1498 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1499                           int bufnr, int count)
1500 {
1501         int diff;
1502
1503         qperf_inc(q, inbound_call);
1504
1505         if (!q->u.in.polling)
1506                 goto set;
1507
1508         /* protect against stop polling setting an ACK for an emptied slsb */
1509         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1510                 /* overwriting everything, just delete polling status */
1511                 q->u.in.polling = 0;
1512                 q->u.in.ack_count = 0;
1513                 goto set;
1514         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1515                 if (is_qebsm(q)) {
1516                         /* partial overwrite, just update ack_start */
1517                         diff = add_buf(bufnr, count);
1518                         diff = sub_buf(diff, q->u.in.ack_start);
1519                         q->u.in.ack_count -= diff;
1520                         if (q->u.in.ack_count <= 0) {
1521                                 q->u.in.polling = 0;
1522                                 q->u.in.ack_count = 0;
1523                                 goto set;
1524                         }
1525                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1526                 }
1527                 else
1528                         /* the only ACK will be deleted, so stop polling */
1529                         q->u.in.polling = 0;
1530         }
1531
1532 set:
1533         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1534         atomic_add(count, &q->nr_buf_used);
1535
1536         if (need_siga_in(q))
1537                 return qdio_siga_input(q);
1538
1539         return 0;
1540 }
1541
1542 /**
1543  * handle_outbound - process filled outbound buffers
1544  * @q: queue containing the buffers
1545  * @callflags: flags
1546  * @bufnr: first buffer to process
1547  * @count: how many buffers are filled
1548  */
1549 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1550                            int bufnr, int count)
1551 {
1552         unsigned char state = 0;
1553         int used, rc = 0;
1554
1555         qperf_inc(q, outbound_call);
1556
1557         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1558         used = atomic_add_return(count, &q->nr_buf_used);
1559
1560         if (used == QDIO_MAX_BUFFERS_PER_Q)
1561                 qperf_inc(q, outbound_queue_full);
1562
1563         if (callflags & QDIO_FLAG_PCI_OUT) {
1564                 q->u.out.pci_out_enabled = 1;
1565                 qperf_inc(q, pci_request_int);
1566         } else
1567                 q->u.out.pci_out_enabled = 0;
1568
1569         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1570                 unsigned long phys_aob = 0;
1571
1572                 /* One SIGA-W per buffer required for unicast HSI */
1573                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1574
1575                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1576
1577                 rc = qdio_kick_outbound_q(q, phys_aob);
1578         } else if (need_siga_sync(q)) {
1579                 rc = qdio_siga_sync_q(q);
1580         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1581                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1582                    state == SLSB_CU_OUTPUT_PRIMED) {
1583                 /* The previous buffer is not processed yet, tack on. */
1584                 qperf_inc(q, fast_requeue);
1585         } else {
1586                 rc = qdio_kick_outbound_q(q, 0);
1587         }
1588
1589         /* in case of SIGA errors we must process the error immediately */
1590         if (used >= q->u.out.scan_threshold || rc)
1591                 qdio_tasklet_schedule(q);
1592         else
1593                 /* free the SBALs in case of no further traffic */
1594                 if (!timer_pending(&q->u.out.timer) &&
1595                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1596                         mod_timer(&q->u.out.timer, jiffies + HZ);
1597         return rc;
1598 }
1599
1600 /**
1601  * do_QDIO - process input or output buffers
1602  * @cdev: associated ccw_device for the qdio subchannel
1603  * @callflags: input or output and special flags from the program
1604  * @q_nr: queue number
1605  * @bufnr: buffer number
1606  * @count: how many buffers to process
1607  */
1608 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1609             int q_nr, unsigned int bufnr, unsigned int count)
1610 {
1611         struct qdio_irq *irq_ptr;
1612
1613         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1614                 return -EINVAL;
1615
1616         irq_ptr = cdev->private->qdio_data;
1617         if (!irq_ptr)
1618                 return -ENODEV;
1619
1620         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1621                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1622
1623         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1624                 return -EIO;
1625         if (!count)
1626                 return 0;
1627         if (callflags & QDIO_FLAG_SYNC_INPUT)
1628                 return handle_inbound(irq_ptr->input_qs[q_nr],
1629                                       callflags, bufnr, count);
1630         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1631                 return handle_outbound(irq_ptr->output_qs[q_nr],
1632                                        callflags, bufnr, count);
1633         return -EINVAL;
1634 }
1635 EXPORT_SYMBOL_GPL(do_QDIO);
1636
1637 /**
1638  * qdio_start_irq - process input buffers
1639  * @cdev: associated ccw_device for the qdio subchannel
1640  * @nr: input queue number
1641  *
1642  * Return codes
1643  *   0 - success
1644  *   1 - irqs not started since new data is available
1645  */
1646 int qdio_start_irq(struct ccw_device *cdev, int nr)
1647 {
1648         struct qdio_q *q;
1649         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1650
1651         if (!irq_ptr)
1652                 return -ENODEV;
1653         q = irq_ptr->input_qs[nr];
1654
1655         clear_nonshared_ind(irq_ptr);
1656         qdio_stop_polling(q);
1657         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1658
1659         /*
1660          * We need to check again to not lose initiative after
1661          * resetting the ACK state.
1662          */
1663         if (test_nonshared_ind(irq_ptr))
1664                 goto rescan;
1665         if (!qdio_inbound_q_done(q))
1666                 goto rescan;
1667         return 0;
1668
1669 rescan:
1670         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1671                              &q->u.in.queue_irq_state))
1672                 return 0;
1673         else
1674                 return 1;
1675
1676 }
1677 EXPORT_SYMBOL(qdio_start_irq);
1678
1679 /**
1680  * qdio_get_next_buffers - process input buffers
1681  * @cdev: associated ccw_device for the qdio subchannel
1682  * @nr: input queue number
1683  * @bufnr: first filled buffer number
1684  * @error: buffers are in error state
1685  *
1686  * Return codes
1687  *   < 0 - error
1688  *   = 0 - no new buffers found
1689  *   > 0 - number of processed buffers
1690  */
1691 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1692                           int *error)
1693 {
1694         struct qdio_q *q;
1695         int start, end;
1696         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1697
1698         if (!irq_ptr)
1699                 return -ENODEV;
1700         q = irq_ptr->input_qs[nr];
1701
1702         /*
1703          * Cannot rely on automatic sync after interrupt since queues may
1704          * also be examined without interrupt.
1705          */
1706         if (need_siga_sync(q))
1707                 qdio_sync_queues(q);
1708
1709         /* check the PCI capable outbound queues. */
1710         qdio_check_outbound_after_thinint(q);
1711
1712         if (!qdio_inbound_q_moved(q))
1713                 return 0;
1714
1715         /* Note: upper-layer MUST stop processing immediately here ... */
1716         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1717                 return -EIO;
1718
1719         start = q->first_to_kick;
1720         end = q->first_to_check;
1721         *bufnr = start;
1722         *error = q->qdio_error;
1723
1724         /* for the next time */
1725         q->first_to_kick = end;
1726         q->qdio_error = 0;
1727         return sub_buf(end, start);
1728 }
1729 EXPORT_SYMBOL(qdio_get_next_buffers);
1730
1731 /**
1732  * qdio_stop_irq - disable interrupt processing for the device
1733  * @cdev: associated ccw_device for the qdio subchannel
1734  * @nr: input queue number
1735  *
1736  * Return codes
1737  *   0 - interrupts were already disabled
1738  *   1 - interrupts successfully disabled
1739  */
1740 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1741 {
1742         struct qdio_q *q;
1743         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1744
1745         if (!irq_ptr)
1746                 return -ENODEV;
1747         q = irq_ptr->input_qs[nr];
1748
1749         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1750                              &q->u.in.queue_irq_state))
1751                 return 0;
1752         else
1753                 return 1;
1754 }
1755 EXPORT_SYMBOL(qdio_stop_irq);
1756
1757 /**
1758  * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1759  * @schid:              Subchannel ID.
1760  * @cnc:                Boolean Change-Notification Control
1761  * @response:           Response code will be stored at this address
1762  * @cb:                 Callback function will be executed for each element
1763  *                      of the address list
1764  * @priv:               Pointer passed from the caller to qdio_pnso_brinfo()
1765  * @type:               Type of the address entry passed to the callback
1766  * @entry:              Entry containg the address of the specified type
1767  * @priv:               Pointer to pass to the callback function.
1768  *
1769  * Performs "Store-network-bridging-information list" operation and calls
1770  * the callback function for every entry in the list. If "change-
1771  * notification-control" is set, further changes in the address list
1772  * will be reported via the IPA command.
1773  */
1774 int qdio_pnso_brinfo(struct subchannel_id schid,
1775                 int cnc, u16 *response,
1776                 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1777                                 void *entry),
1778                 void *priv)
1779 {
1780         struct chsc_pnso_area *rr;
1781         int rc;
1782         u32 prev_instance = 0;
1783         int isfirstblock = 1;
1784         int i, size, elems;
1785
1786         rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1787         if (rr == NULL)
1788                 return -ENOMEM;
1789         do {
1790                 /* on the first iteration, naihdr.resume_token will be zero */
1791                 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1792                 if (rc != 0 && rc != -EBUSY)
1793                         goto out;
1794                 if (rr->response.code != 1) {
1795                         rc = -EIO;
1796                         continue;
1797                 } else
1798                         rc = 0;
1799
1800                 if (cb == NULL)
1801                         continue;
1802
1803                 size = rr->naihdr.naids;
1804                 elems = (rr->response.length -
1805                                 sizeof(struct chsc_header) -
1806                                 sizeof(struct chsc_brinfo_naihdr)) /
1807                                 size;
1808
1809                 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1810                         /* Inform the caller that they need to scrap */
1811                         /* the data that was already reported via cb */
1812                                 rc = -EAGAIN;
1813                                 break;
1814                 }
1815                 isfirstblock = 0;
1816                 prev_instance = rr->naihdr.instance;
1817                 for (i = 0; i < elems; i++)
1818                         switch (size) {
1819                         case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1820                                 (*cb)(priv, l3_ipv6_addr,
1821                                                 &rr->entries.l3_ipv6[i]);
1822                                 break;
1823                         case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1824                                 (*cb)(priv, l3_ipv4_addr,
1825                                                 &rr->entries.l3_ipv4[i]);
1826                                 break;
1827                         case sizeof(struct qdio_brinfo_entry_l2):
1828                                 (*cb)(priv, l2_addr_lnid,
1829                                                 &rr->entries.l2[i]);
1830                                 break;
1831                         default:
1832                                 WARN_ON_ONCE(1);
1833                                 rc = -EIO;
1834                                 goto out;
1835                         }
1836         } while (rr->response.code == 0x0107 ||  /* channel busy */
1837                   (rr->response.code == 1 && /* list stored */
1838                    /* resume token is non-zero => list incomplete */
1839                    (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1840         (*response) = rr->response.code;
1841
1842 out:
1843         free_page((unsigned long)rr);
1844         return rc;
1845 }
1846 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1847
1848 static int __init init_QDIO(void)
1849 {
1850         int rc;
1851
1852         rc = qdio_debug_init();
1853         if (rc)
1854                 return rc;
1855         rc = qdio_setup_init();
1856         if (rc)
1857                 goto out_debug;
1858         rc = tiqdio_allocate_memory();
1859         if (rc)
1860                 goto out_cache;
1861         rc = tiqdio_register_thinints();
1862         if (rc)
1863                 goto out_ti;
1864         return 0;
1865
1866 out_ti:
1867         tiqdio_free_memory();
1868 out_cache:
1869         qdio_setup_exit();
1870 out_debug:
1871         qdio_debug_exit();
1872         return rc;
1873 }
1874
1875 static void __exit exit_QDIO(void)
1876 {
1877         tiqdio_unregister_thinints();
1878         tiqdio_free_memory();
1879         qdio_setup_exit();
1880         qdio_debug_exit();
1881 }
1882
1883 module_init(init_QDIO);
1884 module_exit(exit_QDIO);