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, retried = 0;
 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                 /*
 153                  * Retry once, if that fails bail out and process the
 154                  * extracted buffers before trying again.
 155                  */
 156                 if (!retried++)
 157                         goto again;
 158                 else
 159                         return count - tmp_count;
 160         }
 161
 162         DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 163         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 164         q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE,
 165                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 166         return 0;
 167 }
 168
 169 /**
 170  * qdio_do_sqbs - set buffer states for QEBSM
 171  * @q: queue to manipulate
 172  * @state: new state of the buffers
 173  * @start: first buffer number to change
 174  * @count: how many buffers to change
 175  *
 176  * Returns the number of successfully changed buffers.
 177  * Does retrying until the specified count of buffer states is set or an
 178  * error occurs.
 179  */
 180 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 181                         int count)
 182 {
 183         unsigned int ccq = 0;
 184         int tmp_count = count, tmp_start = start;
 185         int nr = q->nr;
 186         int rc;
 187
 188         if (!count)
 189                 return 0;
 190         qperf_inc(q, sqbs);
 191
 192         if (!q->is_input_q)
 193                 nr += q->irq_ptr->nr_input_qs;
 194 again:
 195         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 196         rc = qdio_check_ccq(q, ccq);
 197         if (!rc) {
 198                 WARN_ON_ONCE(tmp_count);
 199                 return count - tmp_count;
 200         }
 201
 202         if (rc == 1 || rc == 2) {
 203                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 204                 qperf_inc(q, sqbs_partial);
 205                 goto again;
 206         }
 207
 208         DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 209         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 210         q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE,
 211                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 212         return 0;
 213 }
 214
 215 /* returns number of examined buffers and their common state in *state */
 216 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 217                                  unsigned char *state, unsigned int count,
 218                                  int auto_ack, int merge_pending)
 219 {
 220         unsigned char __state = 0;
 221         int i;
 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                         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 230                                 __state = SLSB_P_OUTPUT_EMPTY;
 231                 } else if (merge_pending) {
 232                         if ((q->slsb.val[bufnr] & __state) != __state)
 233                                 break;
 234                 } else if (q->slsb.val[bufnr] != __state)
 235                         break;
 236                 bufnr = next_buf(bufnr);
 237         }
 238         *state = __state;
 239         return i;
 240 }
 241
 242 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 243                                 unsigned char *state, int auto_ack)
 244 {
 245         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 246 }
 247
 248 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 249 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 250                                  unsigned char state, int count)
 251 {
 252         int i;
 253
 254         if (is_qebsm(q))
 255                 return qdio_do_sqbs(q, state, bufnr, count);
 256
 257         for (i = 0; i < count; i++) {
 258                 xchg(&q->slsb.val[bufnr], state);
 259                 bufnr = next_buf(bufnr);
 260         }
 261         return count;
 262 }
 263
 264 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 265                                 unsigned char state)
 266 {
 267         return set_buf_states(q, bufnr, state, 1);
 268 }
 269
 270 /* set slsb states to initial state */
 271 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 272 {
 273         struct qdio_q *q;
 274         int i;
 275
 276         for_each_input_queue(irq_ptr, q, i)
 277                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 278                                QDIO_MAX_BUFFERS_PER_Q);
 279         for_each_output_queue(irq_ptr, q, i)
 280                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 281                                QDIO_MAX_BUFFERS_PER_Q);
 282 }
 283
 284 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 285                           unsigned int input)
 286 {
 287         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 288         unsigned int fc = QDIO_SIGA_SYNC;
 289         int cc;
 290
 291         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 292         qperf_inc(q, siga_sync);
 293
 294         if (is_qebsm(q)) {
 295                 schid = q->irq_ptr->sch_token;
 296                 fc |= QDIO_SIGA_QEBSM_FLAG;
 297         }
 298
 299         cc = do_siga_sync(schid, output, input, fc);
 300         if (unlikely(cc))
 301                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 302         return (cc) ? -EIO : 0;
 303 }
 304
 305 static inline int qdio_siga_sync_q(struct qdio_q *q)
 306 {
 307         if (q->is_input_q)
 308                 return qdio_siga_sync(q, 0, q->mask);
 309         else
 310                 return qdio_siga_sync(q, q->mask, 0);
 311 }
 312
 313 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
 314         unsigned long aob)
 315 {
 316         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 317         unsigned int fc = QDIO_SIGA_WRITE;
 318         u64 start_time = 0;
 319         int retries = 0, cc;
 320         unsigned long laob = 0;
 321
 322         if (q->u.out.use_cq && aob != 0) {
 323                 fc = QDIO_SIGA_WRITEQ;
 324                 laob = aob;
 325         }
 326
 327         if (is_qebsm(q)) {
 328                 schid = q->irq_ptr->sch_token;
 329                 fc |= QDIO_SIGA_QEBSM_FLAG;
 330         }
 331 again:
 332         WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
 333                 (aob && fc != QDIO_SIGA_WRITEQ));
 334         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
 335
 336         /* hipersocket busy condition */
 337         if (unlikely(*busy_bit)) {
 338                 retries++;
 339
 340                 if (!start_time) {
 341                         start_time = get_tod_clock();
 342                         goto again;
 343                 }
 344                 if ((get_tod_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 345                         goto again;
 346         }
 347         if (retries) {
 348                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 349                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 350                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 351         }
 352         return cc;
 353 }
 354
 355 static inline int qdio_siga_input(struct qdio_q *q)
 356 {
 357         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 358         unsigned int fc = QDIO_SIGA_READ;
 359         int cc;
 360
 361         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 362         qperf_inc(q, siga_read);
 363
 364         if (is_qebsm(q)) {
 365                 schid = q->irq_ptr->sch_token;
 366                 fc |= QDIO_SIGA_QEBSM_FLAG;
 367         }
 368
 369         cc = do_siga_input(schid, q->mask, fc);
 370         if (unlikely(cc))
 371                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 372         return (cc) ? -EIO : 0;
 373 }
 374
 375 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 376 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 377
 378 static inline void qdio_sync_queues(struct qdio_q *q)
 379 {
 380         /* PCI capable outbound queues will also be scanned so sync them too */
 381         if (pci_out_supported(q))
 382                 qdio_siga_sync_all(q);
 383         else
 384                 qdio_siga_sync_q(q);
 385 }
 386
 387 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 388                         unsigned char *state)
 389 {
 390         if (need_siga_sync(q))
 391                 qdio_siga_sync_q(q);
 392         return get_buf_states(q, bufnr, state, 1, 0, 0);
 393 }
 394
 395 static inline void qdio_stop_polling(struct qdio_q *q)
 396 {
 397         if (!q->u.in.polling)
 398                 return;
 399
 400         q->u.in.polling = 0;
 401         qperf_inc(q, stop_polling);
 402
 403         /* show the card that we are not polling anymore */
 404         if (is_qebsm(q)) {
 405                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 406                                q->u.in.ack_count);
 407                 q->u.in.ack_count = 0;
 408         } else
 409                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 410 }
 411
 412 static inline void account_sbals(struct qdio_q *q, int count)
 413 {
 414         int pos = 0;
 415
 416         q->q_stats.nr_sbal_total += count;
 417         if (count == QDIO_MAX_BUFFERS_MASK) {
 418                 q->q_stats.nr_sbals[7]++;
 419                 return;
 420         }
 421         while (count >>= 1)
 422                 pos++;
 423         q->q_stats.nr_sbals[pos]++;
 424 }
 425
 426 static void process_buffer_error(struct qdio_q *q, int count)
 427 {
 428         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 429                                         SLSB_P_OUTPUT_NOT_INIT;
 430
 431         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 432
 433         /* special handling for no target buffer empty */
 434         if ((!q->is_input_q &&
 435             (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
 436                 qperf_inc(q, target_full);
 437                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 438                               q->first_to_check);
 439                 goto set;
 440         }
 441
 442         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 443         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 444         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 445         DBF_ERROR("F14:%2x F15:%2x",
 446                   q->sbal[q->first_to_check]->element[14].sflags,
 447                   q->sbal[q->first_to_check]->element[15].sflags);
 448
 449 set:
 450         /*
 451          * Interrupts may be avoided as long as the error is present
 452          * so change the buffer state immediately to avoid starvation.
 453          */
 454         set_buf_states(q, q->first_to_check, state, count);
 455 }
 456
 457 static inline void inbound_primed(struct qdio_q *q, int count)
 458 {
 459         int new;
 460
 461         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 462
 463         /* for QEBSM the ACK was already set by EQBS */
 464         if (is_qebsm(q)) {
 465                 if (!q->u.in.polling) {
 466                         q->u.in.polling = 1;
 467                         q->u.in.ack_count = count;
 468                         q->u.in.ack_start = q->first_to_check;
 469                         return;
 470                 }
 471
 472                 /* delete the previous ACK's */
 473                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 474                                q->u.in.ack_count);
 475                 q->u.in.ack_count = count;
 476                 q->u.in.ack_start = q->first_to_check;
 477                 return;
 478         }
 479
 480         /*
 481          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 482          * or by the next inbound run.
 483          */
 484         new = add_buf(q->first_to_check, count - 1);
 485         if (q->u.in.polling) {
 486                 /* reset the previous ACK but first set the new one */
 487                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 488                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 489         } else {
 490                 q->u.in.polling = 1;
 491                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 492         }
 493
 494         q->u.in.ack_start = new;
 495         count--;
 496         if (!count)
 497                 return;
 498         /* need to change ALL buffers to get more interrupts */
 499         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 500 }
 501
 502 static int get_inbound_buffer_frontier(struct qdio_q *q)
 503 {
 504         int count, stop;
 505         unsigned char state = 0;
 506
 507         q->timestamp = get_tod_clock();
 508
 509         /*
 510          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 511          * would return 0.
 512          */
 513         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 514         stop = add_buf(q->first_to_check, count);
 515
 516         if (q->first_to_check == stop)
 517                 goto out;
 518
 519         /*
 520          * No siga sync here, as a PCI or we after a thin interrupt
 521          * already sync'ed the queues.
 522          */
 523         count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
 524         if (!count)
 525                 goto out;
 526
 527         switch (state) {
 528         case SLSB_P_INPUT_PRIMED:
 529                 inbound_primed(q, count);
 530                 q->first_to_check = add_buf(q->first_to_check, count);
 531                 if (atomic_sub(count, &q->nr_buf_used) == 0)
 532                         qperf_inc(q, inbound_queue_full);
 533                 if (q->irq_ptr->perf_stat_enabled)
 534                         account_sbals(q, count);
 535                 break;
 536         case SLSB_P_INPUT_ERROR:
 537                 process_buffer_error(q, count);
 538                 q->first_to_check = add_buf(q->first_to_check, count);
 539                 atomic_sub(count, &q->nr_buf_used);
 540                 if (q->irq_ptr->perf_stat_enabled)
 541                         account_sbals_error(q, count);
 542                 break;
 543         case SLSB_CU_INPUT_EMPTY:
 544         case SLSB_P_INPUT_NOT_INIT:
 545         case SLSB_P_INPUT_ACK:
 546                 if (q->irq_ptr->perf_stat_enabled)
 547                         q->q_stats.nr_sbal_nop++;
 548                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 549                 break;
 550         default:
 551                 WARN_ON_ONCE(1);
 552         }
 553 out:
 554         return q->first_to_check;
 555 }
 556
 557 static int qdio_inbound_q_moved(struct qdio_q *q)
 558 {
 559         int bufnr;
 560
 561         bufnr = get_inbound_buffer_frontier(q);
 562
 563         if (bufnr != q->last_move) {
 564                 q->last_move = bufnr;
 565                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 566                         q->u.in.timestamp = get_tod_clock();
 567                 return 1;
 568         } else
 569                 return 0;
 570 }
 571
 572 static inline int qdio_inbound_q_done(struct qdio_q *q)
 573 {
 574         unsigned char state = 0;
 575
 576         if (!atomic_read(&q->nr_buf_used))
 577                 return 1;
 578
 579         if (need_siga_sync(q))
 580                 qdio_siga_sync_q(q);
 581         get_buf_state(q, q->first_to_check, &state, 0);
 582
 583         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 584                 /* more work coming */
 585                 return 0;
 586
 587         if (is_thinint_irq(q->irq_ptr))
 588                 return 1;
 589
 590         /* don't poll under z/VM */
 591         if (MACHINE_IS_VM)
 592                 return 1;
 593
 594         /*
 595          * At this point we know, that inbound first_to_check
 596          * has (probably) not moved (see qdio_inbound_processing).
 597          */
 598         if (get_tod_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 599                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 600                               q->first_to_check);
 601                 return 1;
 602         } else
 603                 return 0;
 604 }
 605
 606 static inline int contains_aobs(struct qdio_q *q)
 607 {
 608         return !q->is_input_q && q->u.out.use_cq;
 609 }
 610
 611 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 612 {
 613         unsigned char state = 0;
 614         int j, b = start;
 615
 616         if (!contains_aobs(q))
 617                 return;
 618
 619         for (j = 0; j < count; ++j) {
 620                 get_buf_state(q, b, &state, 0);
 621                 if (state == SLSB_P_OUTPUT_PENDING) {
 622                         struct qaob *aob = q->u.out.aobs[b];
 623                         if (aob == NULL)
 624                                 continue;
 625
 626                         q->u.out.sbal_state[b].flags |=
 627                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 628                         q->u.out.aobs[b] = NULL;
 629                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
 630                         q->u.out.sbal_state[b].aob = NULL;
 631                 }
 632                 b = next_buf(b);
 633         }
 634 }
 635
 636 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 637                                         int bufnr)
 638 {
 639         unsigned long phys_aob = 0;
 640
 641         if (!q->use_cq)
 642                 goto out;
 643
 644         if (!q->aobs[bufnr]) {
 645                 struct qaob *aob = qdio_allocate_aob();
 646                 q->aobs[bufnr] = aob;
 647         }
 648         if (q->aobs[bufnr]) {
 649                 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
 650                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
 651                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 652                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 653                 WARN_ON_ONCE(phys_aob & 0xFF);
 654         }
 655
 656 out:
 657         return phys_aob;
 658 }
 659
 660 static void qdio_kick_handler(struct qdio_q *q)
 661 {
 662         int start = q->first_to_kick;
 663         int end = q->first_to_check;
 664         int count;
 665
 666         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 667                 return;
 668
 669         count = sub_buf(end, start);
 670
 671         if (q->is_input_q) {
 672                 qperf_inc(q, inbound_handler);
 673                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 674         } else {
 675                 qperf_inc(q, outbound_handler);
 676                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 677                               start, count);
 678         }
 679
 680         qdio_handle_aobs(q, start, count);
 681
 682         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 683                    q->irq_ptr->int_parm);
 684
 685         /* for the next time */
 686         q->first_to_kick = end;
 687         q->qdio_error = 0;
 688 }
 689
 690 static void __qdio_inbound_processing(struct qdio_q *q)
 691 {
 692         qperf_inc(q, tasklet_inbound);
 693
 694         if (!qdio_inbound_q_moved(q))
 695                 return;
 696
 697         qdio_kick_handler(q);
 698
 699         if (!qdio_inbound_q_done(q)) {
 700                 /* means poll time is not yet over */
 701                 qperf_inc(q, tasklet_inbound_resched);
 702                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 703                         tasklet_schedule(&q->tasklet);
 704                         return;
 705                 }
 706         }
 707
 708         qdio_stop_polling(q);
 709         /*
 710          * We need to check again to not lose initiative after
 711          * resetting the ACK state.
 712          */
 713         if (!qdio_inbound_q_done(q)) {
 714                 qperf_inc(q, tasklet_inbound_resched2);
 715                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 716                         tasklet_schedule(&q->tasklet);
 717         }
 718 }
 719
 720 void qdio_inbound_processing(unsigned long data)
 721 {
 722         struct qdio_q *q = (struct qdio_q *)data;
 723         __qdio_inbound_processing(q);
 724 }
 725
 726 static int get_outbound_buffer_frontier(struct qdio_q *q)
 727 {
 728         int count, stop;
 729         unsigned char state = 0;
 730
 731         q->timestamp = get_tod_clock();
 732
 733         if (need_siga_sync(q))
 734                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 735                     !pci_out_supported(q)) ||
 736                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 737                     multicast_outbound(q)))
 738                         qdio_siga_sync_q(q);
 739
 740         /*
 741          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 742          * would return 0.
 743          */
 744         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 745         stop = add_buf(q->first_to_check, count);
 746         if (q->first_to_check == stop)
 747                 goto out;
 748
 749         count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
 750         if (!count)
 751                 goto out;
 752
 753         switch (state) {
 754         case SLSB_P_OUTPUT_EMPTY:
 755                 /* the adapter got it */
 756                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 757                         "out empty:%1d %02x", q->nr, count);
 758
 759                 atomic_sub(count, &q->nr_buf_used);
 760                 q->first_to_check = add_buf(q->first_to_check, count);
 761                 if (q->irq_ptr->perf_stat_enabled)
 762                         account_sbals(q, count);
 763
 764                 break;
 765         case SLSB_P_OUTPUT_ERROR:
 766                 process_buffer_error(q, count);
 767                 q->first_to_check = add_buf(q->first_to_check, count);
 768                 atomic_sub(count, &q->nr_buf_used);
 769                 if (q->irq_ptr->perf_stat_enabled)
 770                         account_sbals_error(q, count);
 771                 break;
 772         case SLSB_CU_OUTPUT_PRIMED:
 773                 /* the adapter has not fetched the output yet */
 774                 if (q->irq_ptr->perf_stat_enabled)
 775                         q->q_stats.nr_sbal_nop++;
 776                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 777                               q->nr);
 778                 break;
 779         case SLSB_P_OUTPUT_NOT_INIT:
 780         case SLSB_P_OUTPUT_HALTED:
 781                 break;
 782         default:
 783                 WARN_ON_ONCE(1);
 784         }
 785
 786 out:
 787         return q->first_to_check;
 788 }
 789
 790 /* all buffers processed? */
 791 static inline int qdio_outbound_q_done(struct qdio_q *q)
 792 {
 793         return atomic_read(&q->nr_buf_used) == 0;
 794 }
 795
 796 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 797 {
 798         int bufnr;
 799
 800         bufnr = get_outbound_buffer_frontier(q);
 801
 802         if (bufnr != q->last_move) {
 803                 q->last_move = bufnr;
 804                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 805                 return 1;
 806         } else
 807                 return 0;
 808 }
 809
 810 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 811 {
 812         int retries = 0, cc;
 813         unsigned int busy_bit;
 814
 815         if (!need_siga_out(q))
 816                 return 0;
 817
 818         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 819 retry:
 820         qperf_inc(q, siga_write);
 821
 822         cc = qdio_siga_output(q, &busy_bit, aob);
 823         switch (cc) {
 824         case 0:
 825                 break;
 826         case 2:
 827                 if (busy_bit) {
 828                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 829                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 830                                 goto retry;
 831                         }
 832                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 833                         cc = -EBUSY;
 834                 } else {
 835                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 836                         cc = -ENOBUFS;
 837                 }
 838                 break;
 839         case 1:
 840         case 3:
 841                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 842                 cc = -EIO;
 843                 break;
 844         }
 845         if (retries) {
 846                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 847                 DBF_ERROR("count:%u", retries);
 848         }
 849         return cc;
 850 }
 851
 852 static void __qdio_outbound_processing(struct qdio_q *q)
 853 {
 854         qperf_inc(q, tasklet_outbound);
 855         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 856
 857         if (qdio_outbound_q_moved(q))
 858                 qdio_kick_handler(q);
 859
 860         if (queue_type(q) == QDIO_ZFCP_QFMT)
 861                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 862                         goto sched;
 863
 864         if (q->u.out.pci_out_enabled)
 865                 return;
 866
 867         /*
 868          * Now we know that queue type is either qeth without pci enabled
 869          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 870          * is noticed and outbound_handler is called after some time.
 871          */
 872         if (qdio_outbound_q_done(q))
 873                 del_timer(&q->u.out.timer);
 874         else
 875                 if (!timer_pending(&q->u.out.timer))
 876                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 877         return;
 878
 879 sched:
 880         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 881                 return;
 882         tasklet_schedule(&q->tasklet);
 883 }
 884
 885 /* outbound tasklet */
 886 void qdio_outbound_processing(unsigned long data)
 887 {
 888         struct qdio_q *q = (struct qdio_q *)data;
 889         __qdio_outbound_processing(q);
 890 }
 891
 892 void qdio_outbound_timer(unsigned long data)
 893 {
 894         struct qdio_q *q = (struct qdio_q *)data;
 895
 896         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 897                 return;
 898         tasklet_schedule(&q->tasklet);
 899 }
 900
 901 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 902 {
 903         struct qdio_q *out;
 904         int i;
 905
 906         if (!pci_out_supported(q))
 907                 return;
 908
 909         for_each_output_queue(q->irq_ptr, out, i)
 910                 if (!qdio_outbound_q_done(out))
 911                         tasklet_schedule(&out->tasklet);
 912 }
 913
 914 static void __tiqdio_inbound_processing(struct qdio_q *q)
 915 {
 916         qperf_inc(q, tasklet_inbound);
 917         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 918                 qdio_sync_queues(q);
 919
 920         /*
 921          * The interrupt could be caused by a PCI request. Check the
 922          * PCI capable outbound queues.
 923          */
 924         qdio_check_outbound_after_thinint(q);
 925
 926         if (!qdio_inbound_q_moved(q))
 927                 return;
 928
 929         qdio_kick_handler(q);
 930
 931         if (!qdio_inbound_q_done(q)) {
 932                 qperf_inc(q, tasklet_inbound_resched);
 933                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 934                         tasklet_schedule(&q->tasklet);
 935                         return;
 936                 }
 937         }
 938
 939         qdio_stop_polling(q);
 940         /*
 941          * We need to check again to not lose initiative after
 942          * resetting the ACK state.
 943          */
 944         if (!qdio_inbound_q_done(q)) {
 945                 qperf_inc(q, tasklet_inbound_resched2);
 946                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 947                         tasklet_schedule(&q->tasklet);
 948         }
 949 }
 950
 951 void tiqdio_inbound_processing(unsigned long data)
 952 {
 953         struct qdio_q *q = (struct qdio_q *)data;
 954         __tiqdio_inbound_processing(q);
 955 }
 956
 957 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 958                                   enum qdio_irq_states state)
 959 {
 960         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 961
 962         irq_ptr->state = state;
 963         mb();
 964 }
 965
 966 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 967 {
 968         if (irb->esw.esw0.erw.cons) {
 969                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 970                 DBF_ERROR_HEX(irb, 64);
 971                 DBF_ERROR_HEX(irb->ecw, 64);
 972         }
 973 }
 974
 975 /* PCI interrupt handler */
 976 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 977 {
 978         int i;
 979         struct qdio_q *q;
 980
 981         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 982                 return;
 983
 984         for_each_input_queue(irq_ptr, q, i) {
 985                 if (q->u.in.queue_start_poll) {
 986                         /* skip if polling is enabled or already in work */
 987                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 988                                      &q->u.in.queue_irq_state)) {
 989                                 qperf_inc(q, int_discarded);
 990                                 continue;
 991                         }
 992                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 993                                                  q->irq_ptr->int_parm);
 994                 } else {
 995                         tasklet_schedule(&q->tasklet);
 996                 }
 997         }
 998
 999         if (!pci_out_supported(q))
1000                 return;
1001
1002         for_each_output_queue(irq_ptr, q, i) {
1003                 if (qdio_outbound_q_done(q))
1004                         continue;
1005                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1006                         qdio_siga_sync_q(q);
1007                 tasklet_schedule(&q->tasklet);
1008         }
1009 }
1010
1011 static void qdio_handle_activate_check(struct ccw_device *cdev,
1012                                 unsigned long intparm, int cstat, int dstat)
1013 {
1014         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1015         struct qdio_q *q;
1016         int count;
1017
1018         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1019         DBF_ERROR("intp :%lx", intparm);
1020         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1021
1022         if (irq_ptr->nr_input_qs) {
1023                 q = irq_ptr->input_qs[0];
1024         } else if (irq_ptr->nr_output_qs) {
1025                 q = irq_ptr->output_qs[0];
1026         } else {
1027                 dump_stack();
1028                 goto no_handler;
1029         }
1030
1031         count = sub_buf(q->first_to_check, q->first_to_kick);
1032         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1033                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1034 no_handler:
1035         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1036         /*
1037          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1038          * Therefore we call the LGR detection function here.
1039          */
1040         lgr_info_log();
1041 }
1042
1043 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1044                                       int dstat)
1045 {
1046         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1047
1048         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1049
1050         if (cstat)
1051                 goto error;
1052         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1053                 goto error;
1054         if (!(dstat & DEV_STAT_DEV_END))
1055                 goto error;
1056         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1057         return;
1058
1059 error:
1060         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1061         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1062         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1063 }
1064
1065 /* qdio interrupt handler */
1066 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1067                       struct irb *irb)
1068 {
1069         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1070         int cstat, dstat;
1071
1072         if (!intparm || !irq_ptr) {
1073                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1074                 return;
1075         }
1076
1077         if (irq_ptr->perf_stat_enabled)
1078                 irq_ptr->perf_stat.qdio_int++;
1079
1080         if (IS_ERR(irb)) {
1081                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1082                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1083                 wake_up(&cdev->private->wait_q);
1084                 return;
1085         }
1086         qdio_irq_check_sense(irq_ptr, irb);
1087         cstat = irb->scsw.cmd.cstat;
1088         dstat = irb->scsw.cmd.dstat;
1089
1090         switch (irq_ptr->state) {
1091         case QDIO_IRQ_STATE_INACTIVE:
1092                 qdio_establish_handle_irq(cdev, cstat, dstat);
1093                 break;
1094         case QDIO_IRQ_STATE_CLEANUP:
1095                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1096                 break;
1097         case QDIO_IRQ_STATE_ESTABLISHED:
1098         case QDIO_IRQ_STATE_ACTIVE:
1099                 if (cstat & SCHN_STAT_PCI) {
1100                         qdio_int_handler_pci(irq_ptr);
1101                         return;
1102                 }
1103                 if (cstat || dstat)
1104                         qdio_handle_activate_check(cdev, intparm, cstat,
1105                                                    dstat);
1106                 break;
1107         case QDIO_IRQ_STATE_STOPPED:
1108                 break;
1109         default:
1110                 WARN_ON_ONCE(1);
1111         }
1112         wake_up(&cdev->private->wait_q);
1113 }
1114
1115 /**
1116  * qdio_get_ssqd_desc - get qdio subchannel description
1117  * @cdev: ccw device to get description for
1118  * @data: where to store the ssqd
1119  *
1120  * Returns 0 or an error code. The results of the chsc are stored in the
1121  * specified structure.
1122  */
1123 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1124                        struct qdio_ssqd_desc *data)
1125 {
1126
1127         if (!cdev || !cdev->private)
1128                 return -EINVAL;
1129
1130         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1131         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1132 }
1133 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1134
1135 static void qdio_shutdown_queues(struct ccw_device *cdev)
1136 {
1137         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1138         struct qdio_q *q;
1139         int i;
1140
1141         for_each_input_queue(irq_ptr, q, i)
1142                 tasklet_kill(&q->tasklet);
1143
1144         for_each_output_queue(irq_ptr, q, i) {
1145                 del_timer(&q->u.out.timer);
1146                 tasklet_kill(&q->tasklet);
1147         }
1148 }
1149
1150 /**
1151  * qdio_shutdown - shut down a qdio subchannel
1152  * @cdev: associated ccw device
1153  * @how: use halt or clear to shutdown
1154  */
1155 int qdio_shutdown(struct ccw_device *cdev, int how)
1156 {
1157         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1158         int rc;
1159         unsigned long flags;
1160
1161         if (!irq_ptr)
1162                 return -ENODEV;
1163
1164         WARN_ON_ONCE(irqs_disabled());
1165         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1166
1167         mutex_lock(&irq_ptr->setup_mutex);
1168         /*
1169          * Subchannel was already shot down. We cannot prevent being called
1170          * twice since cio may trigger a shutdown asynchronously.
1171          */
1172         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1173                 mutex_unlock(&irq_ptr->setup_mutex);
1174                 return 0;
1175         }
1176
1177         /*
1178          * Indicate that the device is going down. Scheduling the queue
1179          * tasklets is forbidden from here on.
1180          */
1181         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1182
1183         tiqdio_remove_input_queues(irq_ptr);
1184         qdio_shutdown_queues(cdev);
1185         qdio_shutdown_debug_entries(irq_ptr);
1186
1187         /* cleanup subchannel */
1188         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1189
1190         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1191                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1192         else
1193                 /* default behaviour is halt */
1194                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1195         if (rc) {
1196                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1197                 DBF_ERROR("rc:%4d", rc);
1198                 goto no_cleanup;
1199         }
1200
1201         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1202         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1203         wait_event_interruptible_timeout(cdev->private->wait_q,
1204                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1205                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1206                 10 * HZ);
1207         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1208
1209 no_cleanup:
1210         qdio_shutdown_thinint(irq_ptr);
1211
1212         /* restore interrupt handler */
1213         if ((void *)cdev->handler == (void *)qdio_int_handler)
1214                 cdev->handler = irq_ptr->orig_handler;
1215         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1216
1217         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1218         mutex_unlock(&irq_ptr->setup_mutex);
1219         if (rc)
1220                 return rc;
1221         return 0;
1222 }
1223 EXPORT_SYMBOL_GPL(qdio_shutdown);
1224
1225 /**
1226  * qdio_free - free data structures for a qdio subchannel
1227  * @cdev: associated ccw device
1228  */
1229 int qdio_free(struct ccw_device *cdev)
1230 {
1231         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1232
1233         if (!irq_ptr)
1234                 return -ENODEV;
1235
1236         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1237         mutex_lock(&irq_ptr->setup_mutex);
1238
1239         if (irq_ptr->debug_area != NULL) {
1240                 debug_unregister(irq_ptr->debug_area);
1241                 irq_ptr->debug_area = NULL;
1242         }
1243         cdev->private->qdio_data = NULL;
1244         mutex_unlock(&irq_ptr->setup_mutex);
1245
1246         qdio_release_memory(irq_ptr);
1247         return 0;
1248 }
1249 EXPORT_SYMBOL_GPL(qdio_free);
1250
1251 /**
1252  * qdio_allocate - allocate qdio queues and associated data
1253  * @init_data: initialization data
1254  */
1255 int qdio_allocate(struct qdio_initialize *init_data)
1256 {
1257         struct qdio_irq *irq_ptr;
1258
1259         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1260
1261         if ((init_data->no_input_qs && !init_data->input_handler) ||
1262             (init_data->no_output_qs && !init_data->output_handler))
1263                 return -EINVAL;
1264
1265         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1266             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1267                 return -EINVAL;
1268
1269         if ((!init_data->input_sbal_addr_array) ||
1270             (!init_data->output_sbal_addr_array))
1271                 return -EINVAL;
1272
1273         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1274         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1275         if (!irq_ptr)
1276                 goto out_err;
1277
1278         mutex_init(&irq_ptr->setup_mutex);
1279         qdio_allocate_dbf(init_data, irq_ptr);
1280
1281         /*
1282          * Allocate a page for the chsc calls in qdio_establish.
1283          * Must be pre-allocated since a zfcp recovery will call
1284          * qdio_establish. In case of low memory and swap on a zfcp disk
1285          * we may not be able to allocate memory otherwise.
1286          */
1287         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1288         if (!irq_ptr->chsc_page)
1289                 goto out_rel;
1290
1291         /* qdr is used in ccw1.cda which is u32 */
1292         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1293         if (!irq_ptr->qdr)
1294                 goto out_rel;
1295
1296         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1297                              init_data->no_output_qs))
1298                 goto out_rel;
1299
1300         init_data->cdev->private->qdio_data = irq_ptr;
1301         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1302         return 0;
1303 out_rel:
1304         qdio_release_memory(irq_ptr);
1305 out_err:
1306         return -ENOMEM;
1307 }
1308 EXPORT_SYMBOL_GPL(qdio_allocate);
1309
1310 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1311 {
1312         struct qdio_q *q = irq_ptr->input_qs[0];
1313         int i, use_cq = 0;
1314
1315         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1316                 use_cq = 1;
1317
1318         for_each_output_queue(irq_ptr, q, i) {
1319                 if (use_cq) {
1320                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1321                                 use_cq = 0;
1322                                 continue;
1323                         }
1324                 } else
1325                         qdio_disable_async_operation(&q->u.out);
1326         }
1327         DBF_EVENT("use_cq:%d", use_cq);
1328 }
1329
1330 /**
1331  * qdio_establish - establish queues on a qdio subchannel
1332  * @init_data: initialization data
1333  */
1334 int qdio_establish(struct qdio_initialize *init_data)
1335 {
1336         struct qdio_irq *irq_ptr;
1337         struct ccw_device *cdev = init_data->cdev;
1338         unsigned long saveflags;
1339         int rc;
1340
1341         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1342
1343         irq_ptr = cdev->private->qdio_data;
1344         if (!irq_ptr)
1345                 return -ENODEV;
1346
1347         if (cdev->private->state != DEV_STATE_ONLINE)
1348                 return -EINVAL;
1349
1350         mutex_lock(&irq_ptr->setup_mutex);
1351         qdio_setup_irq(init_data);
1352
1353         rc = qdio_establish_thinint(irq_ptr);
1354         if (rc) {
1355                 mutex_unlock(&irq_ptr->setup_mutex);
1356                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1357                 return rc;
1358         }
1359
1360         /* establish q */
1361         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1362         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1363         irq_ptr->ccw.count = irq_ptr->equeue.count;
1364         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1365
1366         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1367         ccw_device_set_options_mask(cdev, 0);
1368
1369         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1370         if (rc) {
1371                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1372                 DBF_ERROR("rc:%4x", rc);
1373         }
1374         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1375
1376         if (rc) {
1377                 mutex_unlock(&irq_ptr->setup_mutex);
1378                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1379                 return rc;
1380         }
1381
1382         wait_event_interruptible_timeout(cdev->private->wait_q,
1383                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1384                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1385
1386         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1387                 mutex_unlock(&irq_ptr->setup_mutex);
1388                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1389                 return -EIO;
1390         }
1391
1392         qdio_setup_ssqd_info(irq_ptr);
1393
1394         qdio_detect_hsicq(irq_ptr);
1395
1396         /* qebsm is now setup if available, initialize buffer states */
1397         qdio_init_buf_states(irq_ptr);
1398
1399         mutex_unlock(&irq_ptr->setup_mutex);
1400         qdio_print_subchannel_info(irq_ptr, cdev);
1401         qdio_setup_debug_entries(irq_ptr, cdev);
1402         return 0;
1403 }
1404 EXPORT_SYMBOL_GPL(qdio_establish);
1405
1406 /**
1407  * qdio_activate - activate queues on a qdio subchannel
1408  * @cdev: associated cdev
1409  */
1410 int qdio_activate(struct ccw_device *cdev)
1411 {
1412         struct qdio_irq *irq_ptr;
1413         int rc;
1414         unsigned long saveflags;
1415
1416         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1417
1418         irq_ptr = cdev->private->qdio_data;
1419         if (!irq_ptr)
1420                 return -ENODEV;
1421
1422         if (cdev->private->state != DEV_STATE_ONLINE)
1423                 return -EINVAL;
1424
1425         mutex_lock(&irq_ptr->setup_mutex);
1426         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1427                 rc = -EBUSY;
1428                 goto out;
1429         }
1430
1431         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1432         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1433         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1434         irq_ptr->ccw.cda = 0;
1435
1436         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1437         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1438
1439         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1440                               0, DOIO_DENY_PREFETCH);
1441         if (rc) {
1442                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1443                 DBF_ERROR("rc:%4x", rc);
1444         }
1445         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1446
1447         if (rc)
1448                 goto out;
1449
1450         if (is_thinint_irq(irq_ptr))
1451                 tiqdio_add_input_queues(irq_ptr);
1452
1453         /* wait for subchannel to become active */
1454         msleep(5);
1455
1456         switch (irq_ptr->state) {
1457         case QDIO_IRQ_STATE_STOPPED:
1458         case QDIO_IRQ_STATE_ERR:
1459                 rc = -EIO;
1460                 break;
1461         default:
1462                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1463                 rc = 0;
1464         }
1465 out:
1466         mutex_unlock(&irq_ptr->setup_mutex);
1467         return rc;
1468 }
1469 EXPORT_SYMBOL_GPL(qdio_activate);
1470
1471 static inline int buf_in_between(int bufnr, int start, int count)
1472 {
1473         int end = add_buf(start, count);
1474
1475         if (end > start) {
1476                 if (bufnr >= start && bufnr < end)
1477                         return 1;
1478                 else
1479                         return 0;
1480         }
1481
1482         /* wrap-around case */
1483         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1484             (bufnr < end))
1485                 return 1;
1486         else
1487                 return 0;
1488 }
1489
1490 /**
1491  * handle_inbound - reset processed input buffers
1492  * @q: queue containing the buffers
1493  * @callflags: flags
1494  * @bufnr: first buffer to process
1495  * @count: how many buffers are emptied
1496  */
1497 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1498                           int bufnr, int count)
1499 {
1500         int diff;
1501
1502         qperf_inc(q, inbound_call);
1503
1504         if (!q->u.in.polling)
1505                 goto set;
1506
1507         /* protect against stop polling setting an ACK for an emptied slsb */
1508         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1509                 /* overwriting everything, just delete polling status */
1510                 q->u.in.polling = 0;
1511                 q->u.in.ack_count = 0;
1512                 goto set;
1513         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1514                 if (is_qebsm(q)) {
1515                         /* partial overwrite, just update ack_start */
1516                         diff = add_buf(bufnr, count);
1517                         diff = sub_buf(diff, q->u.in.ack_start);
1518                         q->u.in.ack_count -= diff;
1519                         if (q->u.in.ack_count <= 0) {
1520                                 q->u.in.polling = 0;
1521                                 q->u.in.ack_count = 0;
1522                                 goto set;
1523                         }
1524                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1525                 }
1526                 else
1527                         /* the only ACK will be deleted, so stop polling */
1528                         q->u.in.polling = 0;
1529         }
1530
1531 set:
1532         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1533         atomic_add(count, &q->nr_buf_used);
1534
1535         if (need_siga_in(q))
1536                 return qdio_siga_input(q);
1537
1538         return 0;
1539 }
1540
1541 /**
1542  * handle_outbound - process filled outbound buffers
1543  * @q: queue containing the buffers
1544  * @callflags: flags
1545  * @bufnr: first buffer to process
1546  * @count: how many buffers are filled
1547  */
1548 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1549                            int bufnr, int count)
1550 {
1551         unsigned char state = 0;
1552         int used, rc = 0;
1553
1554         qperf_inc(q, outbound_call);
1555
1556         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1557         used = atomic_add_return(count, &q->nr_buf_used);
1558
1559         if (used == QDIO_MAX_BUFFERS_PER_Q)
1560                 qperf_inc(q, outbound_queue_full);
1561
1562         if (callflags & QDIO_FLAG_PCI_OUT) {
1563                 q->u.out.pci_out_enabled = 1;
1564                 qperf_inc(q, pci_request_int);
1565         } else
1566                 q->u.out.pci_out_enabled = 0;
1567
1568         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1569                 unsigned long phys_aob = 0;
1570
1571                 /* One SIGA-W per buffer required for unicast HSI */
1572                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1573
1574                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1575
1576                 rc = qdio_kick_outbound_q(q, phys_aob);
1577         } else if (need_siga_sync(q)) {
1578                 rc = qdio_siga_sync_q(q);
1579         } else {
1580                 /* try to fast requeue buffers */
1581                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1582                 if (state != SLSB_CU_OUTPUT_PRIMED)
1583                         rc = qdio_kick_outbound_q(q, 0);
1584                 else
1585                         qperf_inc(q, fast_requeue);
1586         }
1587
1588         /* in case of SIGA errors we must process the error immediately */
1589         if (used >= q->u.out.scan_threshold || rc)
1590                 tasklet_schedule(&q->tasklet);
1591         else
1592                 /* free the SBALs in case of no further traffic */
1593                 if (!timer_pending(&q->u.out.timer))
1594                         mod_timer(&q->u.out.timer, jiffies + HZ);
1595         return rc;
1596 }
1597
1598 /**
1599  * do_QDIO - process input or output buffers
1600  * @cdev: associated ccw_device for the qdio subchannel
1601  * @callflags: input or output and special flags from the program
1602  * @q_nr: queue number
1603  * @bufnr: buffer number
1604  * @count: how many buffers to process
1605  */
1606 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1607             int q_nr, unsigned int bufnr, unsigned int count)
1608 {
1609         struct qdio_irq *irq_ptr;
1610
1611         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1612                 return -EINVAL;
1613
1614         irq_ptr = cdev->private->qdio_data;
1615         if (!irq_ptr)
1616                 return -ENODEV;
1617
1618         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1619                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1620
1621         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1622                 return -EIO;
1623         if (!count)
1624                 return 0;
1625         if (callflags & QDIO_FLAG_SYNC_INPUT)
1626                 return handle_inbound(irq_ptr->input_qs[q_nr],
1627                                       callflags, bufnr, count);
1628         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1629                 return handle_outbound(irq_ptr->output_qs[q_nr],
1630                                        callflags, bufnr, count);
1631         return -EINVAL;
1632 }
1633 EXPORT_SYMBOL_GPL(do_QDIO);
1634
1635 /**
1636  * qdio_start_irq - process input buffers
1637  * @cdev: associated ccw_device for the qdio subchannel
1638  * @nr: input queue number
1639  *
1640  * Return codes
1641  *   0 - success
1642  *   1 - irqs not started since new data is available
1643  */
1644 int qdio_start_irq(struct ccw_device *cdev, int nr)
1645 {
1646         struct qdio_q *q;
1647         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1648
1649         if (!irq_ptr)
1650                 return -ENODEV;
1651         q = irq_ptr->input_qs[nr];
1652
1653         clear_nonshared_ind(irq_ptr);
1654         qdio_stop_polling(q);
1655         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1656
1657         /*
1658          * We need to check again to not lose initiative after
1659          * resetting the ACK state.
1660          */
1661         if (test_nonshared_ind(irq_ptr))
1662                 goto rescan;
1663         if (!qdio_inbound_q_done(q))
1664                 goto rescan;
1665         return 0;
1666
1667 rescan:
1668         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1669                              &q->u.in.queue_irq_state))
1670                 return 0;
1671         else
1672                 return 1;
1673
1674 }
1675 EXPORT_SYMBOL(qdio_start_irq);
1676
1677 /**
1678  * qdio_get_next_buffers - process input buffers
1679  * @cdev: associated ccw_device for the qdio subchannel
1680  * @nr: input queue number
1681  * @bufnr: first filled buffer number
1682  * @error: buffers are in error state
1683  *
1684  * Return codes
1685  *   < 0 - error
1686  *   = 0 - no new buffers found
1687  *   > 0 - number of processed buffers
1688  */
1689 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1690                           int *error)
1691 {
1692         struct qdio_q *q;
1693         int start, end;
1694         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1695
1696         if (!irq_ptr)
1697                 return -ENODEV;
1698         q = irq_ptr->input_qs[nr];
1699
1700         /*
1701          * Cannot rely on automatic sync after interrupt since queues may
1702          * also be examined without interrupt.
1703          */
1704         if (need_siga_sync(q))
1705                 qdio_sync_queues(q);
1706
1707         /* check the PCI capable outbound queues. */
1708         qdio_check_outbound_after_thinint(q);
1709
1710         if (!qdio_inbound_q_moved(q))
1711                 return 0;
1712
1713         /* Note: upper-layer MUST stop processing immediately here ... */
1714         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1715                 return -EIO;
1716
1717         start = q->first_to_kick;
1718         end = q->first_to_check;
1719         *bufnr = start;
1720         *error = q->qdio_error;
1721
1722         /* for the next time */
1723         q->first_to_kick = end;
1724         q->qdio_error = 0;
1725         return sub_buf(end, start);
1726 }
1727 EXPORT_SYMBOL(qdio_get_next_buffers);
1728
1729 /**
1730  * qdio_stop_irq - disable interrupt processing for the device
1731  * @cdev: associated ccw_device for the qdio subchannel
1732  * @nr: input queue number
1733  *
1734  * Return codes
1735  *   0 - interrupts were already disabled
1736  *   1 - interrupts successfully disabled
1737  */
1738 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1739 {
1740         struct qdio_q *q;
1741         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1742
1743         if (!irq_ptr)
1744                 return -ENODEV;
1745         q = irq_ptr->input_qs[nr];
1746
1747         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1748                              &q->u.in.queue_irq_state))
1749                 return 0;
1750         else
1751                 return 1;
1752 }
1753 EXPORT_SYMBOL(qdio_stop_irq);
1754
1755 static int __init init_QDIO(void)
1756 {
1757         int rc;
1758
1759         rc = qdio_debug_init();
1760         if (rc)
1761                 return rc;
1762         rc = qdio_setup_init();
1763         if (rc)
1764                 goto out_debug;
1765         rc = tiqdio_allocate_memory();
1766         if (rc)
1767                 goto out_cache;
1768         rc = tiqdio_register_thinints();
1769         if (rc)
1770                 goto out_ti;
1771         return 0;
1772
1773 out_ti:
1774         tiqdio_free_memory();
1775 out_cache:
1776         qdio_setup_exit();
1777 out_debug:
1778         qdio_debug_exit();
1779         return rc;
1780 }
1781
1782 static void __exit exit_QDIO(void)
1783 {
1784         tiqdio_unregister_thinints();
1785         tiqdio_free_memory();
1786         qdio_setup_exit();
1787         qdio_debug_exit();
1788 }
1789
1790 module_init(init_QDIO);
1791 module_exit(exit_QDIO);