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_clock();
 342                         goto again;
 343                 }
 344                 if ((get_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_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_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_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_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
 612                                 int i, struct qaob *aob)
 613 {
 614         int tmp;
 615
 616         DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
 617                         (unsigned long) virt_to_phys(aob));
 618         DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
 619                         (unsigned long) aob->res0[0]);
 620         DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
 621                         (unsigned long) aob->res0[1]);
 622         DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
 623                         (unsigned long) aob->res0[2]);
 624         DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
 625                         (unsigned long) aob->res0[3]);
 626         DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
 627                         (unsigned long) aob->res0[4]);
 628         DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
 629                         (unsigned long) aob->res0[5]);
 630         DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
 631         DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
 632         DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
 633         DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
 634         DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
 635         DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
 636         DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
 637         for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
 638                 DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
 639                                 (unsigned long) aob->sba[tmp]);
 640                 DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
 641                                 (unsigned long) q->sbal[i]->element[tmp].addr);
 642                 DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
 643                 DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
 644                                 q->sbal[i]->element[tmp].length);
 645         }
 646         DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
 647         for (tmp = 0; tmp < 2; ++tmp) {
 648                 DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
 649                         (unsigned long) aob->res4[tmp]);
 650         }
 651         DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
 652         DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
 653 }
 654
 655 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 656 {
 657         unsigned char state = 0;
 658         int j, b = start;
 659
 660         if (!contains_aobs(q))
 661                 return;
 662
 663         for (j = 0; j < count; ++j) {
 664                 get_buf_state(q, b, &state, 0);
 665                 if (state == SLSB_P_OUTPUT_PENDING) {
 666                         struct qaob *aob = q->u.out.aobs[b];
 667                         if (aob == NULL)
 668                                 continue;
 669
 670                         q->u.out.sbal_state[b].flags |=
 671                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 672                         q->u.out.aobs[b] = NULL;
 673                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
 674                         q->u.out.sbal_state[b].aob = NULL;
 675                 }
 676                 b = next_buf(b);
 677         }
 678 }
 679
 680 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 681                                         int bufnr)
 682 {
 683         unsigned long phys_aob = 0;
 684
 685         if (!q->use_cq)
 686                 goto out;
 687
 688         if (!q->aobs[bufnr]) {
 689                 struct qaob *aob = qdio_allocate_aob();
 690                 q->aobs[bufnr] = aob;
 691         }
 692         if (q->aobs[bufnr]) {
 693                 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
 694                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
 695                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 696                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 697                 WARN_ON_ONCE(phys_aob & 0xFF);
 698         }
 699
 700 out:
 701         return phys_aob;
 702 }
 703
 704 static void qdio_kick_handler(struct qdio_q *q)
 705 {
 706         int start = q->first_to_kick;
 707         int end = q->first_to_check;
 708         int count;
 709
 710         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 711                 return;
 712
 713         count = sub_buf(end, start);
 714
 715         if (q->is_input_q) {
 716                 qperf_inc(q, inbound_handler);
 717                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 718         } else {
 719                 qperf_inc(q, outbound_handler);
 720                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 721                               start, count);
 722         }
 723
 724         qdio_handle_aobs(q, start, count);
 725
 726         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 727                    q->irq_ptr->int_parm);
 728
 729         /* for the next time */
 730         q->first_to_kick = end;
 731         q->qdio_error = 0;
 732 }
 733
 734 static void __qdio_inbound_processing(struct qdio_q *q)
 735 {
 736         qperf_inc(q, tasklet_inbound);
 737
 738         if (!qdio_inbound_q_moved(q))
 739                 return;
 740
 741         qdio_kick_handler(q);
 742
 743         if (!qdio_inbound_q_done(q)) {
 744                 /* means poll time is not yet over */
 745                 qperf_inc(q, tasklet_inbound_resched);
 746                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 747                         tasklet_schedule(&q->tasklet);
 748                         return;
 749                 }
 750         }
 751
 752         qdio_stop_polling(q);
 753         /*
 754          * We need to check again to not lose initiative after
 755          * resetting the ACK state.
 756          */
 757         if (!qdio_inbound_q_done(q)) {
 758                 qperf_inc(q, tasklet_inbound_resched2);
 759                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 760                         tasklet_schedule(&q->tasklet);
 761         }
 762 }
 763
 764 void qdio_inbound_processing(unsigned long data)
 765 {
 766         struct qdio_q *q = (struct qdio_q *)data;
 767         __qdio_inbound_processing(q);
 768 }
 769
 770 static int get_outbound_buffer_frontier(struct qdio_q *q)
 771 {
 772         int count, stop;
 773         unsigned char state = 0;
 774
 775         q->timestamp = get_clock();
 776
 777         if (need_siga_sync(q))
 778                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 779                     !pci_out_supported(q)) ||
 780                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 781                     multicast_outbound(q)))
 782                         qdio_siga_sync_q(q);
 783
 784         /*
 785          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 786          * would return 0.
 787          */
 788         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 789         stop = add_buf(q->first_to_check, count);
 790         if (q->first_to_check == stop)
 791                 goto out;
 792
 793         count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
 794         if (!count)
 795                 goto out;
 796
 797         switch (state) {
 798         case SLSB_P_OUTPUT_EMPTY:
 799                 /* the adapter got it */
 800                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 801                         "out empty:%1d %02x", q->nr, count);
 802
 803                 atomic_sub(count, &q->nr_buf_used);
 804                 q->first_to_check = add_buf(q->first_to_check, count);
 805                 if (q->irq_ptr->perf_stat_enabled)
 806                         account_sbals(q, count);
 807
 808                 break;
 809         case SLSB_P_OUTPUT_ERROR:
 810                 process_buffer_error(q, count);
 811                 q->first_to_check = add_buf(q->first_to_check, count);
 812                 atomic_sub(count, &q->nr_buf_used);
 813                 if (q->irq_ptr->perf_stat_enabled)
 814                         account_sbals_error(q, count);
 815                 break;
 816         case SLSB_CU_OUTPUT_PRIMED:
 817                 /* the adapter has not fetched the output yet */
 818                 if (q->irq_ptr->perf_stat_enabled)
 819                         q->q_stats.nr_sbal_nop++;
 820                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 821                               q->nr);
 822                 break;
 823         case SLSB_P_OUTPUT_NOT_INIT:
 824         case SLSB_P_OUTPUT_HALTED:
 825                 break;
 826         default:
 827                 WARN_ON_ONCE(1);
 828         }
 829
 830 out:
 831         return q->first_to_check;
 832 }
 833
 834 /* all buffers processed? */
 835 static inline int qdio_outbound_q_done(struct qdio_q *q)
 836 {
 837         return atomic_read(&q->nr_buf_used) == 0;
 838 }
 839
 840 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 841 {
 842         int bufnr;
 843
 844         bufnr = get_outbound_buffer_frontier(q);
 845
 846         if (bufnr != q->last_move) {
 847                 q->last_move = bufnr;
 848                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 849                 return 1;
 850         } else
 851                 return 0;
 852 }
 853
 854 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 855 {
 856         int retries = 0, cc;
 857         unsigned int busy_bit;
 858
 859         if (!need_siga_out(q))
 860                 return 0;
 861
 862         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 863 retry:
 864         qperf_inc(q, siga_write);
 865
 866         cc = qdio_siga_output(q, &busy_bit, aob);
 867         switch (cc) {
 868         case 0:
 869                 break;
 870         case 2:
 871                 if (busy_bit) {
 872                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 873                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 874                                 goto retry;
 875                         }
 876                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 877                         cc = -EBUSY;
 878                 } else {
 879                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 880                         cc = -ENOBUFS;
 881                 }
 882                 break;
 883         case 1:
 884         case 3:
 885                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 886                 cc = -EIO;
 887                 break;
 888         }
 889         if (retries) {
 890                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 891                 DBF_ERROR("count:%u", retries);
 892         }
 893         return cc;
 894 }
 895
 896 static void __qdio_outbound_processing(struct qdio_q *q)
 897 {
 898         qperf_inc(q, tasklet_outbound);
 899         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 900
 901         if (qdio_outbound_q_moved(q))
 902                 qdio_kick_handler(q);
 903
 904         if (queue_type(q) == QDIO_ZFCP_QFMT)
 905                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 906                         goto sched;
 907
 908         if (q->u.out.pci_out_enabled)
 909                 return;
 910
 911         /*
 912          * Now we know that queue type is either qeth without pci enabled
 913          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 914          * is noticed and outbound_handler is called after some time.
 915          */
 916         if (qdio_outbound_q_done(q))
 917                 del_timer(&q->u.out.timer);
 918         else
 919                 if (!timer_pending(&q->u.out.timer))
 920                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 921         return;
 922
 923 sched:
 924         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 925                 return;
 926         tasklet_schedule(&q->tasklet);
 927 }
 928
 929 /* outbound tasklet */
 930 void qdio_outbound_processing(unsigned long data)
 931 {
 932         struct qdio_q *q = (struct qdio_q *)data;
 933         __qdio_outbound_processing(q);
 934 }
 935
 936 void qdio_outbound_timer(unsigned long data)
 937 {
 938         struct qdio_q *q = (struct qdio_q *)data;
 939
 940         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 941                 return;
 942         tasklet_schedule(&q->tasklet);
 943 }
 944
 945 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 946 {
 947         struct qdio_q *out;
 948         int i;
 949
 950         if (!pci_out_supported(q))
 951                 return;
 952
 953         for_each_output_queue(q->irq_ptr, out, i)
 954                 if (!qdio_outbound_q_done(out))
 955                         tasklet_schedule(&out->tasklet);
 956 }
 957
 958 static void __tiqdio_inbound_processing(struct qdio_q *q)
 959 {
 960         qperf_inc(q, tasklet_inbound);
 961         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 962                 qdio_sync_queues(q);
 963
 964         /*
 965          * The interrupt could be caused by a PCI request. Check the
 966          * PCI capable outbound queues.
 967          */
 968         qdio_check_outbound_after_thinint(q);
 969
 970         if (!qdio_inbound_q_moved(q))
 971                 return;
 972
 973         qdio_kick_handler(q);
 974
 975         if (!qdio_inbound_q_done(q)) {
 976                 qperf_inc(q, tasklet_inbound_resched);
 977                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 978                         tasklet_schedule(&q->tasklet);
 979                         return;
 980                 }
 981         }
 982
 983         qdio_stop_polling(q);
 984         /*
 985          * We need to check again to not lose initiative after
 986          * resetting the ACK state.
 987          */
 988         if (!qdio_inbound_q_done(q)) {
 989                 qperf_inc(q, tasklet_inbound_resched2);
 990                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 991                         tasklet_schedule(&q->tasklet);
 992         }
 993 }
 994
 995 void tiqdio_inbound_processing(unsigned long data)
 996 {
 997         struct qdio_q *q = (struct qdio_q *)data;
 998         __tiqdio_inbound_processing(q);
 999 }
1000
1001 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
1002                                   enum qdio_irq_states state)
1003 {
1004         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
1005
1006         irq_ptr->state = state;
1007         mb();
1008 }
1009
1010 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
1011 {
1012         if (irb->esw.esw0.erw.cons) {
1013                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
1014                 DBF_ERROR_HEX(irb, 64);
1015                 DBF_ERROR_HEX(irb->ecw, 64);
1016         }
1017 }
1018
1019 /* PCI interrupt handler */
1020 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
1021 {
1022         int i;
1023         struct qdio_q *q;
1024
1025         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
1026                 return;
1027
1028         for_each_input_queue(irq_ptr, q, i) {
1029                 if (q->u.in.queue_start_poll) {
1030                         /* skip if polling is enabled or already in work */
1031                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1032                                      &q->u.in.queue_irq_state)) {
1033                                 qperf_inc(q, int_discarded);
1034                                 continue;
1035                         }
1036                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
1037                                                  q->irq_ptr->int_parm);
1038                 } else {
1039                         tasklet_schedule(&q->tasklet);
1040                 }
1041         }
1042
1043         if (!pci_out_supported(q))
1044                 return;
1045
1046         for_each_output_queue(irq_ptr, q, i) {
1047                 if (qdio_outbound_q_done(q))
1048                         continue;
1049                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1050                         qdio_siga_sync_q(q);
1051                 tasklet_schedule(&q->tasklet);
1052         }
1053 }
1054
1055 static void qdio_handle_activate_check(struct ccw_device *cdev,
1056                                 unsigned long intparm, int cstat, int dstat)
1057 {
1058         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1059         struct qdio_q *q;
1060         int count;
1061
1062         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1063         DBF_ERROR("intp :%lx", intparm);
1064         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1065
1066         if (irq_ptr->nr_input_qs) {
1067                 q = irq_ptr->input_qs[0];
1068         } else if (irq_ptr->nr_output_qs) {
1069                 q = irq_ptr->output_qs[0];
1070         } else {
1071                 dump_stack();
1072                 goto no_handler;
1073         }
1074
1075         count = sub_buf(q->first_to_check, q->first_to_kick);
1076         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1077                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1078 no_handler:
1079         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1080         /*
1081          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1082          * Therefore we call the LGR detection function here.
1083          */
1084         lgr_info_log();
1085 }
1086
1087 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1088                                       int dstat)
1089 {
1090         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1091
1092         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1093
1094         if (cstat)
1095                 goto error;
1096         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1097                 goto error;
1098         if (!(dstat & DEV_STAT_DEV_END))
1099                 goto error;
1100         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1101         return;
1102
1103 error:
1104         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1105         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1106         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1107 }
1108
1109 /* qdio interrupt handler */
1110 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1111                       struct irb *irb)
1112 {
1113         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1114         int cstat, dstat;
1115
1116         if (!intparm || !irq_ptr) {
1117                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1118                 return;
1119         }
1120
1121         if (irq_ptr->perf_stat_enabled)
1122                 irq_ptr->perf_stat.qdio_int++;
1123
1124         if (IS_ERR(irb)) {
1125                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1126                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1127                 wake_up(&cdev->private->wait_q);
1128                 return;
1129         }
1130         qdio_irq_check_sense(irq_ptr, irb);
1131         cstat = irb->scsw.cmd.cstat;
1132         dstat = irb->scsw.cmd.dstat;
1133
1134         switch (irq_ptr->state) {
1135         case QDIO_IRQ_STATE_INACTIVE:
1136                 qdio_establish_handle_irq(cdev, cstat, dstat);
1137                 break;
1138         case QDIO_IRQ_STATE_CLEANUP:
1139                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1140                 break;
1141         case QDIO_IRQ_STATE_ESTABLISHED:
1142         case QDIO_IRQ_STATE_ACTIVE:
1143                 if (cstat & SCHN_STAT_PCI) {
1144                         qdio_int_handler_pci(irq_ptr);
1145                         return;
1146                 }
1147                 if (cstat || dstat)
1148                         qdio_handle_activate_check(cdev, intparm, cstat,
1149                                                    dstat);
1150                 break;
1151         case QDIO_IRQ_STATE_STOPPED:
1152                 break;
1153         default:
1154                 WARN_ON_ONCE(1);
1155         }
1156         wake_up(&cdev->private->wait_q);
1157 }
1158
1159 /**
1160  * qdio_get_ssqd_desc - get qdio subchannel description
1161  * @cdev: ccw device to get description for
1162  * @data: where to store the ssqd
1163  *
1164  * Returns 0 or an error code. The results of the chsc are stored in the
1165  * specified structure.
1166  */
1167 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1168                        struct qdio_ssqd_desc *data)
1169 {
1170
1171         if (!cdev || !cdev->private)
1172                 return -EINVAL;
1173
1174         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1175         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1176 }
1177 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1178
1179 static void qdio_shutdown_queues(struct ccw_device *cdev)
1180 {
1181         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1182         struct qdio_q *q;
1183         int i;
1184
1185         for_each_input_queue(irq_ptr, q, i)
1186                 tasklet_kill(&q->tasklet);
1187
1188         for_each_output_queue(irq_ptr, q, i) {
1189                 del_timer(&q->u.out.timer);
1190                 tasklet_kill(&q->tasklet);
1191         }
1192 }
1193
1194 /**
1195  * qdio_shutdown - shut down a qdio subchannel
1196  * @cdev: associated ccw device
1197  * @how: use halt or clear to shutdown
1198  */
1199 int qdio_shutdown(struct ccw_device *cdev, int how)
1200 {
1201         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1202         int rc;
1203         unsigned long flags;
1204
1205         if (!irq_ptr)
1206                 return -ENODEV;
1207
1208         WARN_ON_ONCE(irqs_disabled());
1209         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1210
1211         mutex_lock(&irq_ptr->setup_mutex);
1212         /*
1213          * Subchannel was already shot down. We cannot prevent being called
1214          * twice since cio may trigger a shutdown asynchronously.
1215          */
1216         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1217                 mutex_unlock(&irq_ptr->setup_mutex);
1218                 return 0;
1219         }
1220
1221         /*
1222          * Indicate that the device is going down. Scheduling the queue
1223          * tasklets is forbidden from here on.
1224          */
1225         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1226
1227         tiqdio_remove_input_queues(irq_ptr);
1228         qdio_shutdown_queues(cdev);
1229         qdio_shutdown_debug_entries(irq_ptr, cdev);
1230
1231         /* cleanup subchannel */
1232         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1233
1234         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1235                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1236         else
1237                 /* default behaviour is halt */
1238                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1239         if (rc) {
1240                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1241                 DBF_ERROR("rc:%4d", rc);
1242                 goto no_cleanup;
1243         }
1244
1245         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1246         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1247         wait_event_interruptible_timeout(cdev->private->wait_q,
1248                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1249                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1250                 10 * HZ);
1251         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1252
1253 no_cleanup:
1254         qdio_shutdown_thinint(irq_ptr);
1255
1256         /* restore interrupt handler */
1257         if ((void *)cdev->handler == (void *)qdio_int_handler)
1258                 cdev->handler = irq_ptr->orig_handler;
1259         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1260
1261         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1262         mutex_unlock(&irq_ptr->setup_mutex);
1263         if (rc)
1264                 return rc;
1265         return 0;
1266 }
1267 EXPORT_SYMBOL_GPL(qdio_shutdown);
1268
1269 /**
1270  * qdio_free - free data structures for a qdio subchannel
1271  * @cdev: associated ccw device
1272  */
1273 int qdio_free(struct ccw_device *cdev)
1274 {
1275         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1276
1277         if (!irq_ptr)
1278                 return -ENODEV;
1279
1280         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1281         mutex_lock(&irq_ptr->setup_mutex);
1282
1283         if (irq_ptr->debug_area != NULL) {
1284                 debug_unregister(irq_ptr->debug_area);
1285                 irq_ptr->debug_area = NULL;
1286         }
1287         cdev->private->qdio_data = NULL;
1288         mutex_unlock(&irq_ptr->setup_mutex);
1289
1290         qdio_release_memory(irq_ptr);
1291         return 0;
1292 }
1293 EXPORT_SYMBOL_GPL(qdio_free);
1294
1295 /**
1296  * qdio_allocate - allocate qdio queues and associated data
1297  * @init_data: initialization data
1298  */
1299 int qdio_allocate(struct qdio_initialize *init_data)
1300 {
1301         struct qdio_irq *irq_ptr;
1302
1303         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1304
1305         if ((init_data->no_input_qs && !init_data->input_handler) ||
1306             (init_data->no_output_qs && !init_data->output_handler))
1307                 return -EINVAL;
1308
1309         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1310             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1311                 return -EINVAL;
1312
1313         if ((!init_data->input_sbal_addr_array) ||
1314             (!init_data->output_sbal_addr_array))
1315                 return -EINVAL;
1316
1317         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1318         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1319         if (!irq_ptr)
1320                 goto out_err;
1321
1322         mutex_init(&irq_ptr->setup_mutex);
1323         qdio_allocate_dbf(init_data, irq_ptr);
1324
1325         /*
1326          * Allocate a page for the chsc calls in qdio_establish.
1327          * Must be pre-allocated since a zfcp recovery will call
1328          * qdio_establish. In case of low memory and swap on a zfcp disk
1329          * we may not be able to allocate memory otherwise.
1330          */
1331         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1332         if (!irq_ptr->chsc_page)
1333                 goto out_rel;
1334
1335         /* qdr is used in ccw1.cda which is u32 */
1336         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1337         if (!irq_ptr->qdr)
1338                 goto out_rel;
1339
1340         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1341                              init_data->no_output_qs))
1342                 goto out_rel;
1343
1344         init_data->cdev->private->qdio_data = irq_ptr;
1345         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1346         return 0;
1347 out_rel:
1348         qdio_release_memory(irq_ptr);
1349 out_err:
1350         return -ENOMEM;
1351 }
1352 EXPORT_SYMBOL_GPL(qdio_allocate);
1353
1354 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1355 {
1356         struct qdio_q *q = irq_ptr->input_qs[0];
1357         int i, use_cq = 0;
1358
1359         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1360                 use_cq = 1;
1361
1362         for_each_output_queue(irq_ptr, q, i) {
1363                 if (use_cq) {
1364                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1365                                 use_cq = 0;
1366                                 continue;
1367                         }
1368                 } else
1369                         qdio_disable_async_operation(&q->u.out);
1370         }
1371         DBF_EVENT("use_cq:%d", use_cq);
1372 }
1373
1374 /**
1375  * qdio_establish - establish queues on a qdio subchannel
1376  * @init_data: initialization data
1377  */
1378 int qdio_establish(struct qdio_initialize *init_data)
1379 {
1380         struct qdio_irq *irq_ptr;
1381         struct ccw_device *cdev = init_data->cdev;
1382         unsigned long saveflags;
1383         int rc;
1384
1385         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1386
1387         irq_ptr = cdev->private->qdio_data;
1388         if (!irq_ptr)
1389                 return -ENODEV;
1390
1391         if (cdev->private->state != DEV_STATE_ONLINE)
1392                 return -EINVAL;
1393
1394         mutex_lock(&irq_ptr->setup_mutex);
1395         qdio_setup_irq(init_data);
1396
1397         rc = qdio_establish_thinint(irq_ptr);
1398         if (rc) {
1399                 mutex_unlock(&irq_ptr->setup_mutex);
1400                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1401                 return rc;
1402         }
1403
1404         /* establish q */
1405         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1406         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1407         irq_ptr->ccw.count = irq_ptr->equeue.count;
1408         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1409
1410         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1411         ccw_device_set_options_mask(cdev, 0);
1412
1413         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1414         if (rc) {
1415                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1416                 DBF_ERROR("rc:%4x", rc);
1417         }
1418         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1419
1420         if (rc) {
1421                 mutex_unlock(&irq_ptr->setup_mutex);
1422                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1423                 return rc;
1424         }
1425
1426         wait_event_interruptible_timeout(cdev->private->wait_q,
1427                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1428                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1429
1430         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1431                 mutex_unlock(&irq_ptr->setup_mutex);
1432                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1433                 return -EIO;
1434         }
1435
1436         qdio_setup_ssqd_info(irq_ptr);
1437
1438         qdio_detect_hsicq(irq_ptr);
1439
1440         /* qebsm is now setup if available, initialize buffer states */
1441         qdio_init_buf_states(irq_ptr);
1442
1443         mutex_unlock(&irq_ptr->setup_mutex);
1444         qdio_print_subchannel_info(irq_ptr, cdev);
1445         qdio_setup_debug_entries(irq_ptr, cdev);
1446         return 0;
1447 }
1448 EXPORT_SYMBOL_GPL(qdio_establish);
1449
1450 /**
1451  * qdio_activate - activate queues on a qdio subchannel
1452  * @cdev: associated cdev
1453  */
1454 int qdio_activate(struct ccw_device *cdev)
1455 {
1456         struct qdio_irq *irq_ptr;
1457         int rc;
1458         unsigned long saveflags;
1459
1460         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1461
1462         irq_ptr = cdev->private->qdio_data;
1463         if (!irq_ptr)
1464                 return -ENODEV;
1465
1466         if (cdev->private->state != DEV_STATE_ONLINE)
1467                 return -EINVAL;
1468
1469         mutex_lock(&irq_ptr->setup_mutex);
1470         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1471                 rc = -EBUSY;
1472                 goto out;
1473         }
1474
1475         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1476         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1477         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1478         irq_ptr->ccw.cda = 0;
1479
1480         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1481         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1482
1483         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1484                               0, DOIO_DENY_PREFETCH);
1485         if (rc) {
1486                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1487                 DBF_ERROR("rc:%4x", rc);
1488         }
1489         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1490
1491         if (rc)
1492                 goto out;
1493
1494         if (is_thinint_irq(irq_ptr))
1495                 tiqdio_add_input_queues(irq_ptr);
1496
1497         /* wait for subchannel to become active */
1498         msleep(5);
1499
1500         switch (irq_ptr->state) {
1501         case QDIO_IRQ_STATE_STOPPED:
1502         case QDIO_IRQ_STATE_ERR:
1503                 rc = -EIO;
1504                 break;
1505         default:
1506                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1507                 rc = 0;
1508         }
1509 out:
1510         mutex_unlock(&irq_ptr->setup_mutex);
1511         return rc;
1512 }
1513 EXPORT_SYMBOL_GPL(qdio_activate);
1514
1515 static inline int buf_in_between(int bufnr, int start, int count)
1516 {
1517         int end = add_buf(start, count);
1518
1519         if (end > start) {
1520                 if (bufnr >= start && bufnr < end)
1521                         return 1;
1522                 else
1523                         return 0;
1524         }
1525
1526         /* wrap-around case */
1527         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1528             (bufnr < end))
1529                 return 1;
1530         else
1531                 return 0;
1532 }
1533
1534 /**
1535  * handle_inbound - reset processed input buffers
1536  * @q: queue containing the buffers
1537  * @callflags: flags
1538  * @bufnr: first buffer to process
1539  * @count: how many buffers are emptied
1540  */
1541 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1542                           int bufnr, int count)
1543 {
1544         int used, diff;
1545
1546         qperf_inc(q, inbound_call);
1547
1548         if (!q->u.in.polling)
1549                 goto set;
1550
1551         /* protect against stop polling setting an ACK for an emptied slsb */
1552         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1553                 /* overwriting everything, just delete polling status */
1554                 q->u.in.polling = 0;
1555                 q->u.in.ack_count = 0;
1556                 goto set;
1557         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1558                 if (is_qebsm(q)) {
1559                         /* partial overwrite, just update ack_start */
1560                         diff = add_buf(bufnr, count);
1561                         diff = sub_buf(diff, q->u.in.ack_start);
1562                         q->u.in.ack_count -= diff;
1563                         if (q->u.in.ack_count <= 0) {
1564                                 q->u.in.polling = 0;
1565                                 q->u.in.ack_count = 0;
1566                                 goto set;
1567                         }
1568                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1569                 }
1570                 else
1571                         /* the only ACK will be deleted, so stop polling */
1572                         q->u.in.polling = 0;
1573         }
1574
1575 set:
1576         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1577         used = atomic_add_return(count, &q->nr_buf_used) - count;
1578
1579         if (need_siga_in(q))
1580                 return qdio_siga_input(q);
1581
1582         return 0;
1583 }
1584
1585 /**
1586  * handle_outbound - process filled outbound buffers
1587  * @q: queue containing the buffers
1588  * @callflags: flags
1589  * @bufnr: first buffer to process
1590  * @count: how many buffers are filled
1591  */
1592 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1593                            int bufnr, int count)
1594 {
1595         unsigned char state = 0;
1596         int used, rc = 0;
1597
1598         qperf_inc(q, outbound_call);
1599
1600         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1601         used = atomic_add_return(count, &q->nr_buf_used);
1602
1603         if (used == QDIO_MAX_BUFFERS_PER_Q)
1604                 qperf_inc(q, outbound_queue_full);
1605
1606         if (callflags & QDIO_FLAG_PCI_OUT) {
1607                 q->u.out.pci_out_enabled = 1;
1608                 qperf_inc(q, pci_request_int);
1609         } else
1610                 q->u.out.pci_out_enabled = 0;
1611
1612         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1613                 unsigned long phys_aob = 0;
1614
1615                 /* One SIGA-W per buffer required for unicast HSI */
1616                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1617
1618                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1619
1620                 rc = qdio_kick_outbound_q(q, phys_aob);
1621         } else if (need_siga_sync(q)) {
1622                 rc = qdio_siga_sync_q(q);
1623         } else {
1624                 /* try to fast requeue buffers */
1625                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1626                 if (state != SLSB_CU_OUTPUT_PRIMED)
1627                         rc = qdio_kick_outbound_q(q, 0);
1628                 else
1629                         qperf_inc(q, fast_requeue);
1630         }
1631
1632         /* in case of SIGA errors we must process the error immediately */
1633         if (used >= q->u.out.scan_threshold || rc)
1634                 tasklet_schedule(&q->tasklet);
1635         else
1636                 /* free the SBALs in case of no further traffic */
1637                 if (!timer_pending(&q->u.out.timer))
1638                         mod_timer(&q->u.out.timer, jiffies + HZ);
1639         return rc;
1640 }
1641
1642 /**
1643  * do_QDIO - process input or output buffers
1644  * @cdev: associated ccw_device for the qdio subchannel
1645  * @callflags: input or output and special flags from the program
1646  * @q_nr: queue number
1647  * @bufnr: buffer number
1648  * @count: how many buffers to process
1649  */
1650 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1651             int q_nr, unsigned int bufnr, unsigned int count)
1652 {
1653         struct qdio_irq *irq_ptr;
1654
1655         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1656                 return -EINVAL;
1657
1658         irq_ptr = cdev->private->qdio_data;
1659         if (!irq_ptr)
1660                 return -ENODEV;
1661
1662         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1663                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1664
1665         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1666                 return -EIO;
1667         if (!count)
1668                 return 0;
1669         if (callflags & QDIO_FLAG_SYNC_INPUT)
1670                 return handle_inbound(irq_ptr->input_qs[q_nr],
1671                                       callflags, bufnr, count);
1672         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1673                 return handle_outbound(irq_ptr->output_qs[q_nr],
1674                                        callflags, bufnr, count);
1675         return -EINVAL;
1676 }
1677 EXPORT_SYMBOL_GPL(do_QDIO);
1678
1679 /**
1680  * qdio_start_irq - process input buffers
1681  * @cdev: associated ccw_device for the qdio subchannel
1682  * @nr: input queue number
1683  *
1684  * Return codes
1685  *   0 - success
1686  *   1 - irqs not started since new data is available
1687  */
1688 int qdio_start_irq(struct ccw_device *cdev, int nr)
1689 {
1690         struct qdio_q *q;
1691         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1692
1693         if (!irq_ptr)
1694                 return -ENODEV;
1695         q = irq_ptr->input_qs[nr];
1696
1697         clear_nonshared_ind(irq_ptr);
1698         qdio_stop_polling(q);
1699         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1700
1701         /*
1702          * We need to check again to not lose initiative after
1703          * resetting the ACK state.
1704          */
1705         if (test_nonshared_ind(irq_ptr))
1706                 goto rescan;
1707         if (!qdio_inbound_q_done(q))
1708                 goto rescan;
1709         return 0;
1710
1711 rescan:
1712         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1713                              &q->u.in.queue_irq_state))
1714                 return 0;
1715         else
1716                 return 1;
1717
1718 }
1719 EXPORT_SYMBOL(qdio_start_irq);
1720
1721 /**
1722  * qdio_get_next_buffers - process input buffers
1723  * @cdev: associated ccw_device for the qdio subchannel
1724  * @nr: input queue number
1725  * @bufnr: first filled buffer number
1726  * @error: buffers are in error state
1727  *
1728  * Return codes
1729  *   < 0 - error
1730  *   = 0 - no new buffers found
1731  *   > 0 - number of processed buffers
1732  */
1733 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1734                           int *error)
1735 {
1736         struct qdio_q *q;
1737         int start, end;
1738         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1739
1740         if (!irq_ptr)
1741                 return -ENODEV;
1742         q = irq_ptr->input_qs[nr];
1743
1744         /*
1745          * Cannot rely on automatic sync after interrupt since queues may
1746          * also be examined without interrupt.
1747          */
1748         if (need_siga_sync(q))
1749                 qdio_sync_queues(q);
1750
1751         /* check the PCI capable outbound queues. */
1752         qdio_check_outbound_after_thinint(q);
1753
1754         if (!qdio_inbound_q_moved(q))
1755                 return 0;
1756
1757         /* Note: upper-layer MUST stop processing immediately here ... */
1758         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1759                 return -EIO;
1760
1761         start = q->first_to_kick;
1762         end = q->first_to_check;
1763         *bufnr = start;
1764         *error = q->qdio_error;
1765
1766         /* for the next time */
1767         q->first_to_kick = end;
1768         q->qdio_error = 0;
1769         return sub_buf(end, start);
1770 }
1771 EXPORT_SYMBOL(qdio_get_next_buffers);
1772
1773 /**
1774  * qdio_stop_irq - disable interrupt processing for the device
1775  * @cdev: associated ccw_device for the qdio subchannel
1776  * @nr: input queue number
1777  *
1778  * Return codes
1779  *   0 - interrupts were already disabled
1780  *   1 - interrupts successfully disabled
1781  */
1782 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1783 {
1784         struct qdio_q *q;
1785         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1786
1787         if (!irq_ptr)
1788                 return -ENODEV;
1789         q = irq_ptr->input_qs[nr];
1790
1791         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1792                              &q->u.in.queue_irq_state))
1793                 return 0;
1794         else
1795                 return 1;
1796 }
1797 EXPORT_SYMBOL(qdio_stop_irq);
1798
1799 static int __init init_QDIO(void)
1800 {
1801         int rc;
1802
1803         rc = qdio_debug_init();
1804         if (rc)
1805                 return rc;
1806         rc = qdio_setup_init();
1807         if (rc)
1808                 goto out_debug;
1809         rc = tiqdio_allocate_memory();
1810         if (rc)
1811                 goto out_cache;
1812         rc = tiqdio_register_thinints();
1813         if (rc)
1814                 goto out_ti;
1815         return 0;
1816
1817 out_ti:
1818         tiqdio_free_memory();
1819 out_cache:
1820         qdio_setup_exit();
1821 out_debug:
1822         qdio_debug_exit();
1823         return rc;
1824 }
1825
1826 static void __exit exit_QDIO(void)
1827 {
1828         tiqdio_unregister_thinints();
1829         tiqdio_free_memory();
1830         qdio_setup_exit();
1831         qdio_debug_exit();
1832 }
1833
1834 module_init(init_QDIO);
1835 module_exit(exit_QDIO);