drivers/s390/cio/qdio_main.c

   1 /*
   2  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   3  *
   4  * Copyright IBM Corp. 2000, 2008
   5  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   6  *            Jan Glauber <jang@linux.vnet.ibm.com>
   7  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   8  */
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/timer.h>
  13 #include <linux/delay.h>
  14 #include <linux/gfp.h>
  15 #include <linux/io.h>
  16 #include <linux/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19 #include <asm/ipl.h>
  20
  21 #include "cio.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "qdio.h"
  25 #include "qdio_debug.h"
  26
  27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  28         "Jan Glauber <jang@linux.vnet.ibm.com>");
  29 MODULE_DESCRIPTION("QDIO base support");
  30 MODULE_LICENSE("GPL");
  31
  32 static inline int do_siga_sync(unsigned long schid,
  33                                unsigned int out_mask, unsigned int in_mask,
  34                                unsigned int fc)
  35 {
  36         register unsigned long __fc asm ("0") = fc;
  37         register unsigned long __schid asm ("1") = schid;
  38         register unsigned long out asm ("2") = out_mask;
  39         register unsigned long in asm ("3") = in_mask;
  40         int cc;
  41
  42         asm volatile(
  43                 "       siga    0\n"
  44                 "       ipm     %0\n"
  45                 "       srl     %0,28\n"
  46                 : "=d" (cc)
  47                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  48         return cc;
  49 }
  50
  51 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  52                                 unsigned int fc)
  53 {
  54         register unsigned long __fc asm ("0") = fc;
  55         register unsigned long __schid asm ("1") = schid;
  56         register unsigned long __mask asm ("2") = mask;
  57         int cc;
  58
  59         asm volatile(
  60                 "       siga    0\n"
  61                 "       ipm     %0\n"
  62                 "       srl     %0,28\n"
  63                 : "=d" (cc)
  64                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  65         return cc;
  66 }
  67
  68 /**
  69  * do_siga_output - perform SIGA-w/wt function
  70  * @schid: subchannel id or in case of QEBSM the subchannel token
  71  * @mask: which output queues to process
  72  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  73  * @fc: function code to perform
  74  *
  75  * Returns condition code.
  76  * Note: For IQDC unicast queues only the highest priority queue is processed.
  77  */
  78 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  79                                  unsigned int *bb, unsigned int fc,
  80                                  unsigned long aob)
  81 {
  82         register unsigned long __fc asm("0") = fc;
  83         register unsigned long __schid asm("1") = schid;
  84         register unsigned long __mask asm("2") = mask;
  85         register unsigned long __aob asm("3") = aob;
  86         int cc;
  87
  88         asm volatile(
  89                 "       siga    0\n"
  90                 "       ipm     %0\n"
  91                 "       srl     %0,28\n"
  92                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  93                 : "d" (__schid), "d" (__mask)
  94                 : "cc");
  95         *bb = __fc >> 31;
  96         return cc;
  97 }
  98
  99 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
 100 {
 101         /* all done or next buffer state different */
 102         if (ccq == 0 || ccq == 32)
 103                 return 0;
 104         /* no buffer processed */
 105         if (ccq == 97)
 106                 return 1;
 107         /* not all buffers processed */
 108         if (ccq == 96)
 109                 return 2;
 110         /* notify devices immediately */
 111         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 112         return -EIO;
 113 }
 114
 115 /**
 116  * qdio_do_eqbs - extract buffer states for QEBSM
 117  * @q: queue to manipulate
 118  * @state: state of the extracted buffers
 119  * @start: buffer number to start at
 120  * @count: count of buffers to examine
 121  * @auto_ack: automatically acknowledge buffers
 122  *
 123  * Returns the number of successfully extracted equal buffer states.
 124  * Stops processing if a state is different from the last buffers state.
 125  */
 126 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 127                         int start, int count, int auto_ack)
 128 {
 129         int rc, tmp_count = count, tmp_start = start, nr = q->nr;
 130         unsigned int ccq = 0;
 131
 132         qperf_inc(q, eqbs);
 133
 134         if (!q->is_input_q)
 135                 nr += q->irq_ptr->nr_input_qs;
 136 again:
 137         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 138                       auto_ack);
 139         rc = qdio_check_ccq(q, ccq);
 140         if (!rc)
 141                 return count - tmp_count;
 142
 143         if (rc == 1) {
 144                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 145                 goto again;
 146         }
 147
 148         if (rc == 2) {
 149                 qperf_inc(q, eqbs_partial);
 150                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
 151                         tmp_count);
 152                 return count - tmp_count;
 153         }
 154
 155         DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 156         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 157         q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE,
 158                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 159         return 0;
 160 }
 161
 162 /**
 163  * qdio_do_sqbs - set buffer states for QEBSM
 164  * @q: queue to manipulate
 165  * @state: new state of the buffers
 166  * @start: first buffer number to change
 167  * @count: how many buffers to change
 168  *
 169  * Returns the number of successfully changed buffers.
 170  * Does retrying until the specified count of buffer states is set or an
 171  * error occurs.
 172  */
 173 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 174                         int count)
 175 {
 176         unsigned int ccq = 0;
 177         int tmp_count = count, tmp_start = start;
 178         int nr = q->nr;
 179         int rc;
 180
 181         if (!count)
 182                 return 0;
 183         qperf_inc(q, sqbs);
 184
 185         if (!q->is_input_q)
 186                 nr += q->irq_ptr->nr_input_qs;
 187 again:
 188         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 189         rc = qdio_check_ccq(q, ccq);
 190         if (!rc) {
 191                 WARN_ON_ONCE(tmp_count);
 192                 return count - tmp_count;
 193         }
 194
 195         if (rc == 1 || rc == 2) {
 196                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 197                 qperf_inc(q, sqbs_partial);
 198                 goto again;
 199         }
 200
 201         DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 202         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 203         q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE,
 204                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 205         return 0;
 206 }
 207
 208 /*
 209  * Returns number of examined buffers and their common state in *state.
 210  * Requested number of buffers-to-examine must be > 0.
 211  */
 212 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 213                                  unsigned char *state, unsigned int count,
 214                                  int auto_ack, int merge_pending)
 215 {
 216         unsigned char __state = 0;
 217         int i;
 218
 219         if (is_qebsm(q))
 220                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 221
 222         /* get initial state: */
 223         __state = q->slsb.val[bufnr];
 224         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 225                 __state = SLSB_P_OUTPUT_EMPTY;
 226
 227         for (i = 1; i < count; i++) {
 228                 bufnr = next_buf(bufnr);
 229
 230                 /* merge PENDING into EMPTY: */
 231                 if (merge_pending &&
 232                     q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING &&
 233                     __state == SLSB_P_OUTPUT_EMPTY)
 234                         continue;
 235
 236                 /* stop if next state differs from initial state: */
 237                 if (q->slsb.val[bufnr] != __state)
 238                         break;
 239         }
 240         *state = __state;
 241         return i;
 242 }
 243
 244 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 245                                 unsigned char *state, int auto_ack)
 246 {
 247         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 248 }
 249
 250 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 251 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 252                                  unsigned char state, int count)
 253 {
 254         int i;
 255
 256         if (is_qebsm(q))
 257                 return qdio_do_sqbs(q, state, bufnr, count);
 258
 259         for (i = 0; i < count; i++) {
 260                 xchg(&q->slsb.val[bufnr], state);
 261                 bufnr = next_buf(bufnr);
 262         }
 263         return count;
 264 }
 265
 266 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 267                                 unsigned char state)
 268 {
 269         return set_buf_states(q, bufnr, state, 1);
 270 }
 271
 272 /* set slsb states to initial state */
 273 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 274 {
 275         struct qdio_q *q;
 276         int i;
 277
 278         for_each_input_queue(irq_ptr, q, i)
 279                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 280                                QDIO_MAX_BUFFERS_PER_Q);
 281         for_each_output_queue(irq_ptr, q, i)
 282                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 283                                QDIO_MAX_BUFFERS_PER_Q);
 284 }
 285
 286 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 287                           unsigned int input)
 288 {
 289         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 290         unsigned int fc = QDIO_SIGA_SYNC;
 291         int cc;
 292
 293         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 294         qperf_inc(q, siga_sync);
 295
 296         if (is_qebsm(q)) {
 297                 schid = q->irq_ptr->sch_token;
 298                 fc |= QDIO_SIGA_QEBSM_FLAG;
 299         }
 300
 301         cc = do_siga_sync(schid, output, input, fc);
 302         if (unlikely(cc))
 303                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 304         return (cc) ? -EIO : 0;
 305 }
 306
 307 static inline int qdio_siga_sync_q(struct qdio_q *q)
 308 {
 309         if (q->is_input_q)
 310                 return qdio_siga_sync(q, 0, q->mask);
 311         else
 312                 return qdio_siga_sync(q, q->mask, 0);
 313 }
 314
 315 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
 316         unsigned long aob)
 317 {
 318         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 319         unsigned int fc = QDIO_SIGA_WRITE;
 320         u64 start_time = 0;
 321         int retries = 0, cc;
 322         unsigned long laob = 0;
 323
 324         WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
 325                              !q->u.out.use_cq));
 326         if (q->u.out.use_cq && aob != 0) {
 327                 fc = QDIO_SIGA_WRITEQ;
 328                 laob = aob;
 329         }
 330
 331         if (is_qebsm(q)) {
 332                 schid = q->irq_ptr->sch_token;
 333                 fc |= QDIO_SIGA_QEBSM_FLAG;
 334         }
 335 again:
 336         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
 337
 338         /* hipersocket busy condition */
 339         if (unlikely(*busy_bit)) {
 340                 retries++;
 341
 342                 if (!start_time) {
 343                         start_time = get_tod_clock_fast();
 344                         goto again;
 345                 }
 346                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 347                         goto again;
 348         }
 349         if (retries) {
 350                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 351                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 352                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 353         }
 354         return cc;
 355 }
 356
 357 static inline int qdio_siga_input(struct qdio_q *q)
 358 {
 359         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 360         unsigned int fc = QDIO_SIGA_READ;
 361         int cc;
 362
 363         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 364         qperf_inc(q, siga_read);
 365
 366         if (is_qebsm(q)) {
 367                 schid = q->irq_ptr->sch_token;
 368                 fc |= QDIO_SIGA_QEBSM_FLAG;
 369         }
 370
 371         cc = do_siga_input(schid, q->mask, fc);
 372         if (unlikely(cc))
 373                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 374         return (cc) ? -EIO : 0;
 375 }
 376
 377 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 378 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 379
 380 static inline void qdio_sync_queues(struct qdio_q *q)
 381 {
 382         /* PCI capable outbound queues will also be scanned so sync them too */
 383         if (pci_out_supported(q))
 384                 qdio_siga_sync_all(q);
 385         else
 386                 qdio_siga_sync_q(q);
 387 }
 388
 389 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 390                         unsigned char *state)
 391 {
 392         if (need_siga_sync(q))
 393                 qdio_siga_sync_q(q);
 394         return get_buf_states(q, bufnr, state, 1, 0, 0);
 395 }
 396
 397 static inline void qdio_stop_polling(struct qdio_q *q)
 398 {
 399         if (!q->u.in.polling)
 400                 return;
 401
 402         q->u.in.polling = 0;
 403         qperf_inc(q, stop_polling);
 404
 405         /* show the card that we are not polling anymore */
 406         if (is_qebsm(q)) {
 407                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 408                                q->u.in.ack_count);
 409                 q->u.in.ack_count = 0;
 410         } else
 411                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 412 }
 413
 414 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 415 {
 416         int pos;
 417
 418         q->q_stats.nr_sbal_total += count;
 419         if (count == QDIO_MAX_BUFFERS_MASK) {
 420                 q->q_stats.nr_sbals[7]++;
 421                 return;
 422         }
 423         pos = ilog2(count);
 424         q->q_stats.nr_sbals[pos]++;
 425 }
 426
 427 static void process_buffer_error(struct qdio_q *q, int count)
 428 {
 429         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 430                                         SLSB_P_OUTPUT_NOT_INIT;
 431
 432         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 433
 434         /* special handling for no target buffer empty */
 435         if ((!q->is_input_q &&
 436             (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
 437                 qperf_inc(q, target_full);
 438                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 439                               q->first_to_check);
 440                 goto set;
 441         }
 442
 443         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 444         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 445         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 446         DBF_ERROR("F14:%2x F15:%2x",
 447                   q->sbal[q->first_to_check]->element[14].sflags,
 448                   q->sbal[q->first_to_check]->element[15].sflags);
 449
 450 set:
 451         /*
 452          * Interrupts may be avoided as long as the error is present
 453          * so change the buffer state immediately to avoid starvation.
 454          */
 455         set_buf_states(q, q->first_to_check, state, count);
 456 }
 457
 458 static inline void inbound_primed(struct qdio_q *q, int count)
 459 {
 460         int new;
 461
 462         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 463
 464         /* for QEBSM the ACK was already set by EQBS */
 465         if (is_qebsm(q)) {
 466                 if (!q->u.in.polling) {
 467                         q->u.in.polling = 1;
 468                         q->u.in.ack_count = count;
 469                         q->u.in.ack_start = q->first_to_check;
 470                         return;
 471                 }
 472
 473                 /* delete the previous ACK's */
 474                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 475                                q->u.in.ack_count);
 476                 q->u.in.ack_count = count;
 477                 q->u.in.ack_start = q->first_to_check;
 478                 return;
 479         }
 480
 481         /*
 482          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 483          * or by the next inbound run.
 484          */
 485         new = add_buf(q->first_to_check, count - 1);
 486         if (q->u.in.polling) {
 487                 /* reset the previous ACK but first set the new one */
 488                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 489                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 490         } else {
 491                 q->u.in.polling = 1;
 492                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 493         }
 494
 495         q->u.in.ack_start = new;
 496         count--;
 497         if (!count)
 498                 return;
 499         /* need to change ALL buffers to get more interrupts */
 500         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 501 }
 502
 503 static int get_inbound_buffer_frontier(struct qdio_q *q)
 504 {
 505         int count, stop;
 506         unsigned char state = 0;
 507
 508         q->timestamp = get_tod_clock_fast();
 509
 510         /*
 511          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 512          * would return 0.
 513          */
 514         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 515         stop = add_buf(q->first_to_check, count);
 516
 517         if (q->first_to_check == stop)
 518                 goto out;
 519
 520         /*
 521          * No siga sync here, as a PCI or we after a thin interrupt
 522          * already sync'ed the queues.
 523          */
 524         count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
 525         if (!count)
 526                 goto out;
 527
 528         switch (state) {
 529         case SLSB_P_INPUT_PRIMED:
 530                 inbound_primed(q, count);
 531                 q->first_to_check = add_buf(q->first_to_check, count);
 532                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 533                         qperf_inc(q, inbound_queue_full);
 534                 if (q->irq_ptr->perf_stat_enabled)
 535                         account_sbals(q, count);
 536                 break;
 537         case SLSB_P_INPUT_ERROR:
 538                 process_buffer_error(q, count);
 539                 q->first_to_check = add_buf(q->first_to_check, count);
 540                 atomic_sub(count, &q->nr_buf_used);
 541                 if (q->irq_ptr->perf_stat_enabled)
 542                         account_sbals_error(q, count);
 543                 break;
 544         case SLSB_CU_INPUT_EMPTY:
 545         case SLSB_P_INPUT_NOT_INIT:
 546         case SLSB_P_INPUT_ACK:
 547                 if (q->irq_ptr->perf_stat_enabled)
 548                         q->q_stats.nr_sbal_nop++;
 549                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 550                 break;
 551         default:
 552                 WARN_ON_ONCE(1);
 553         }
 554 out:
 555         return q->first_to_check;
 556 }
 557
 558 static int qdio_inbound_q_moved(struct qdio_q *q)
 559 {
 560         int bufnr;
 561
 562         bufnr = get_inbound_buffer_frontier(q);
 563
 564         if (bufnr != q->last_move) {
 565                 q->last_move = bufnr;
 566                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 567                         q->u.in.timestamp = get_tod_clock();
 568                 return 1;
 569         } else
 570                 return 0;
 571 }
 572
 573 static inline int qdio_inbound_q_done(struct qdio_q *q)
 574 {
 575         unsigned char state = 0;
 576
 577         if (!atomic_read(&q->nr_buf_used))
 578                 return 1;
 579
 580         if (need_siga_sync(q))
 581                 qdio_siga_sync_q(q);
 582         get_buf_state(q, q->first_to_check, &state, 0);
 583
 584         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 585                 /* more work coming */
 586                 return 0;
 587
 588         if (is_thinint_irq(q->irq_ptr))
 589                 return 1;
 590
 591         /* don't poll under z/VM */
 592         if (MACHINE_IS_VM)
 593                 return 1;
 594
 595         /*
 596          * At this point we know, that inbound first_to_check
 597          * has (probably) not moved (see qdio_inbound_processing).
 598          */
 599         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 600                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 601                               q->first_to_check);
 602                 return 1;
 603         } else
 604                 return 0;
 605 }
 606
 607 static inline int contains_aobs(struct qdio_q *q)
 608 {
 609         return !q->is_input_q && q->u.out.use_cq;
 610 }
 611
 612 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 613 {
 614         unsigned char state = 0;
 615         int j, b = start;
 616
 617         if (!contains_aobs(q))
 618                 return;
 619
 620         for (j = 0; j < count; ++j) {
 621                 get_buf_state(q, b, &state, 0);
 622                 if (state == SLSB_P_OUTPUT_PENDING) {
 623                         struct qaob *aob = q->u.out.aobs[b];
 624                         if (aob == NULL)
 625                                 continue;
 626
 627                         q->u.out.sbal_state[b].flags |=
 628                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 629                         q->u.out.aobs[b] = NULL;
 630                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
 631                         q->u.out.sbal_state[b].aob = NULL;
 632                 }
 633                 b = next_buf(b);
 634         }
 635 }
 636
 637 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 638                                         int bufnr)
 639 {
 640         unsigned long phys_aob = 0;
 641
 642         if (!q->use_cq)
 643                 return 0;
 644
 645         if (!q->aobs[bufnr]) {
 646                 struct qaob *aob = qdio_allocate_aob();
 647                 q->aobs[bufnr] = aob;
 648         }
 649         if (q->aobs[bufnr]) {
 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         q->sbal_state[bufnr].flags = 0;
 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 inline int qdio_tasklet_schedule(struct qdio_q *q)
 691 {
 692         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 693                 tasklet_schedule(&q->tasklet);
 694                 return 0;
 695         }
 696         return -EPERM;
 697 }
 698
 699 static void __qdio_inbound_processing(struct qdio_q *q)
 700 {
 701         qperf_inc(q, tasklet_inbound);
 702
 703         if (!qdio_inbound_q_moved(q))
 704                 return;
 705
 706         qdio_kick_handler(q);
 707
 708         if (!qdio_inbound_q_done(q)) {
 709                 /* means poll time is not yet over */
 710                 qperf_inc(q, tasklet_inbound_resched);
 711                 if (!qdio_tasklet_schedule(q))
 712                         return;
 713         }
 714
 715         qdio_stop_polling(q);
 716         /*
 717          * We need to check again to not lose initiative after
 718          * resetting the ACK state.
 719          */
 720         if (!qdio_inbound_q_done(q)) {
 721                 qperf_inc(q, tasklet_inbound_resched2);
 722                 qdio_tasklet_schedule(q);
 723         }
 724 }
 725
 726 void qdio_inbound_processing(unsigned long data)
 727 {
 728         struct qdio_q *q = (struct qdio_q *)data;
 729         __qdio_inbound_processing(q);
 730 }
 731
 732 static int get_outbound_buffer_frontier(struct qdio_q *q)
 733 {
 734         int count, stop;
 735         unsigned char state = 0;
 736
 737         q->timestamp = get_tod_clock_fast();
 738
 739         if (need_siga_sync(q))
 740                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 741                     !pci_out_supported(q)) ||
 742                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 743                     multicast_outbound(q)))
 744                         qdio_siga_sync_q(q);
 745
 746         /*
 747          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 748          * would return 0.
 749          */
 750         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 751         stop = add_buf(q->first_to_check, count);
 752         if (q->first_to_check == stop)
 753                 goto out;
 754
 755         count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
 756         if (!count)
 757                 goto out;
 758
 759         switch (state) {
 760         case SLSB_P_OUTPUT_EMPTY:
 761         case SLSB_P_OUTPUT_PENDING:
 762                 /* the adapter got it */
 763                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 764                         "out empty:%1d %02x", q->nr, count);
 765
 766                 atomic_sub(count, &q->nr_buf_used);
 767                 q->first_to_check = add_buf(q->first_to_check, count);
 768                 if (q->irq_ptr->perf_stat_enabled)
 769                         account_sbals(q, count);
 770
 771                 break;
 772         case SLSB_P_OUTPUT_ERROR:
 773                 process_buffer_error(q, count);
 774                 q->first_to_check = add_buf(q->first_to_check, count);
 775                 atomic_sub(count, &q->nr_buf_used);
 776                 if (q->irq_ptr->perf_stat_enabled)
 777                         account_sbals_error(q, count);
 778                 break;
 779         case SLSB_CU_OUTPUT_PRIMED:
 780                 /* the adapter has not fetched the output yet */
 781                 if (q->irq_ptr->perf_stat_enabled)
 782                         q->q_stats.nr_sbal_nop++;
 783                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 784                               q->nr);
 785                 break;
 786         case SLSB_P_OUTPUT_NOT_INIT:
 787         case SLSB_P_OUTPUT_HALTED:
 788                 break;
 789         default:
 790                 WARN_ON_ONCE(1);
 791         }
 792
 793 out:
 794         return q->first_to_check;
 795 }
 796
 797 /* all buffers processed? */
 798 static inline int qdio_outbound_q_done(struct qdio_q *q)
 799 {
 800         return atomic_read(&q->nr_buf_used) == 0;
 801 }
 802
 803 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 804 {
 805         int bufnr;
 806
 807         bufnr = get_outbound_buffer_frontier(q);
 808
 809         if (bufnr != q->last_move) {
 810                 q->last_move = bufnr;
 811                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 812                 return 1;
 813         } else
 814                 return 0;
 815 }
 816
 817 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 818 {
 819         int retries = 0, cc;
 820         unsigned int busy_bit;
 821
 822         if (!need_siga_out(q))
 823                 return 0;
 824
 825         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 826 retry:
 827         qperf_inc(q, siga_write);
 828
 829         cc = qdio_siga_output(q, &busy_bit, aob);
 830         switch (cc) {
 831         case 0:
 832                 break;
 833         case 2:
 834                 if (busy_bit) {
 835                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 836                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 837                                 goto retry;
 838                         }
 839                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 840                         cc = -EBUSY;
 841                 } else {
 842                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 843                         cc = -ENOBUFS;
 844                 }
 845                 break;
 846         case 1:
 847         case 3:
 848                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 849                 cc = -EIO;
 850                 break;
 851         }
 852         if (retries) {
 853                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 854                 DBF_ERROR("count:%u", retries);
 855         }
 856         return cc;
 857 }
 858
 859 static void __qdio_outbound_processing(struct qdio_q *q)
 860 {
 861         qperf_inc(q, tasklet_outbound);
 862         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 863
 864         if (qdio_outbound_q_moved(q))
 865                 qdio_kick_handler(q);
 866
 867         if (queue_type(q) == QDIO_ZFCP_QFMT)
 868                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 869                         goto sched;
 870
 871         if (q->u.out.pci_out_enabled)
 872                 return;
 873
 874         /*
 875          * Now we know that queue type is either qeth without pci enabled
 876          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 877          * is noticed and outbound_handler is called after some time.
 878          */
 879         if (qdio_outbound_q_done(q))
 880                 del_timer_sync(&q->u.out.timer);
 881         else
 882                 if (!timer_pending(&q->u.out.timer) &&
 883                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 884                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 885         return;
 886
 887 sched:
 888         qdio_tasklet_schedule(q);
 889 }
 890
 891 /* outbound tasklet */
 892 void qdio_outbound_processing(unsigned long data)
 893 {
 894         struct qdio_q *q = (struct qdio_q *)data;
 895         __qdio_outbound_processing(q);
 896 }
 897
 898 void qdio_outbound_timer(unsigned long data)
 899 {
 900         struct qdio_q *q = (struct qdio_q *)data;
 901
 902         qdio_tasklet_schedule(q);
 903 }
 904
 905 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 906 {
 907         struct qdio_q *out;
 908         int i;
 909
 910         if (!pci_out_supported(q))
 911                 return;
 912
 913         for_each_output_queue(q->irq_ptr, out, i)
 914                 if (!qdio_outbound_q_done(out))
 915                         qdio_tasklet_schedule(out);
 916 }
 917
 918 static void __tiqdio_inbound_processing(struct qdio_q *q)
 919 {
 920         qperf_inc(q, tasklet_inbound);
 921         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 922                 qdio_sync_queues(q);
 923
 924         /*
 925          * The interrupt could be caused by a PCI request. Check the
 926          * PCI capable outbound queues.
 927          */
 928         qdio_check_outbound_after_thinint(q);
 929
 930         if (!qdio_inbound_q_moved(q))
 931                 return;
 932
 933         qdio_kick_handler(q);
 934
 935         if (!qdio_inbound_q_done(q)) {
 936                 qperf_inc(q, tasklet_inbound_resched);
 937                 if (!qdio_tasklet_schedule(q))
 938                         return;
 939         }
 940
 941         qdio_stop_polling(q);
 942         /*
 943          * We need to check again to not lose initiative after
 944          * resetting the ACK state.
 945          */
 946         if (!qdio_inbound_q_done(q)) {
 947                 qperf_inc(q, tasklet_inbound_resched2);
 948                 qdio_tasklet_schedule(q);
 949         }
 950 }
 951
 952 void tiqdio_inbound_processing(unsigned long data)
 953 {
 954         struct qdio_q *q = (struct qdio_q *)data;
 955         __tiqdio_inbound_processing(q);
 956 }
 957
 958 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 959                                   enum qdio_irq_states state)
 960 {
 961         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 962
 963         irq_ptr->state = state;
 964         mb();
 965 }
 966
 967 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 968 {
 969         if (irb->esw.esw0.erw.cons) {
 970                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 971                 DBF_ERROR_HEX(irb, 64);
 972                 DBF_ERROR_HEX(irb->ecw, 64);
 973         }
 974 }
 975
 976 /* PCI interrupt handler */
 977 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 978 {
 979         int i;
 980         struct qdio_q *q;
 981
 982         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 983                 return;
 984
 985         for_each_input_queue(irq_ptr, q, i) {
 986                 if (q->u.in.queue_start_poll) {
 987                         /* skip if polling is enabled or already in work */
 988                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 989                                      &q->u.in.queue_irq_state)) {
 990                                 qperf_inc(q, int_discarded);
 991                                 continue;
 992                         }
 993                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 994                                                  q->irq_ptr->int_parm);
 995                 } else {
 996                         tasklet_schedule(&q->tasklet);
 997                 }
 998         }
 999
1000         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
1001                 return;
1002
1003         for_each_output_queue(irq_ptr, q, i) {
1004                 if (qdio_outbound_q_done(q))
1005                         continue;
1006                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1007                         qdio_siga_sync_q(q);
1008                 qdio_tasklet_schedule(q);
1009         }
1010 }
1011
1012 static void qdio_handle_activate_check(struct ccw_device *cdev,
1013                                 unsigned long intparm, int cstat, int dstat)
1014 {
1015         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1016         struct qdio_q *q;
1017         int count;
1018
1019         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1020         DBF_ERROR("intp :%lx", intparm);
1021         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1022
1023         if (irq_ptr->nr_input_qs) {
1024                 q = irq_ptr->input_qs[0];
1025         } else if (irq_ptr->nr_output_qs) {
1026                 q = irq_ptr->output_qs[0];
1027         } else {
1028                 dump_stack();
1029                 goto no_handler;
1030         }
1031
1032         count = sub_buf(q->first_to_check, q->first_to_kick);
1033         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1034                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1035 no_handler:
1036         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1037         /*
1038          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1039          * Therefore we call the LGR detection function here.
1040          */
1041         lgr_info_log();
1042 }
1043
1044 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1045                                       int dstat)
1046 {
1047         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1048
1049         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1050
1051         if (cstat)
1052                 goto error;
1053         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1054                 goto error;
1055         if (!(dstat & DEV_STAT_DEV_END))
1056                 goto error;
1057         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1058         return;
1059
1060 error:
1061         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1062         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1063         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1064 }
1065
1066 /* qdio interrupt handler */
1067 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1068                       struct irb *irb)
1069 {
1070         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1071         struct subchannel_id schid;
1072         int cstat, dstat;
1073
1074         if (!intparm || !irq_ptr) {
1075                 ccw_device_get_schid(cdev, &schid);
1076                 DBF_ERROR("qint:%4x", schid.sch_no);
1077                 return;
1078         }
1079
1080         if (irq_ptr->perf_stat_enabled)
1081                 irq_ptr->perf_stat.qdio_int++;
1082
1083         if (IS_ERR(irb)) {
1084                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1085                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1086                 wake_up(&cdev->private->wait_q);
1087                 return;
1088         }
1089         qdio_irq_check_sense(irq_ptr, irb);
1090         cstat = irb->scsw.cmd.cstat;
1091         dstat = irb->scsw.cmd.dstat;
1092
1093         switch (irq_ptr->state) {
1094         case QDIO_IRQ_STATE_INACTIVE:
1095                 qdio_establish_handle_irq(cdev, cstat, dstat);
1096                 break;
1097         case QDIO_IRQ_STATE_CLEANUP:
1098                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1099                 break;
1100         case QDIO_IRQ_STATE_ESTABLISHED:
1101         case QDIO_IRQ_STATE_ACTIVE:
1102                 if (cstat & SCHN_STAT_PCI) {
1103                         qdio_int_handler_pci(irq_ptr);
1104                         return;
1105                 }
1106                 if (cstat || dstat)
1107                         qdio_handle_activate_check(cdev, intparm, cstat,
1108                                                    dstat);
1109                 break;
1110         case QDIO_IRQ_STATE_STOPPED:
1111                 break;
1112         default:
1113                 WARN_ON_ONCE(1);
1114         }
1115         wake_up(&cdev->private->wait_q);
1116 }
1117
1118 /**
1119  * qdio_get_ssqd_desc - get qdio subchannel description
1120  * @cdev: ccw device to get description for
1121  * @data: where to store the ssqd
1122  *
1123  * Returns 0 or an error code. The results of the chsc are stored in the
1124  * specified structure.
1125  */
1126 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1127                        struct qdio_ssqd_desc *data)
1128 {
1129         struct subchannel_id schid;
1130
1131         if (!cdev || !cdev->private)
1132                 return -EINVAL;
1133
1134         ccw_device_get_schid(cdev, &schid);
1135         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1136         return qdio_setup_get_ssqd(NULL, &schid, data);
1137 }
1138 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1139
1140 static void qdio_shutdown_queues(struct ccw_device *cdev)
1141 {
1142         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1143         struct qdio_q *q;
1144         int i;
1145
1146         for_each_input_queue(irq_ptr, q, i)
1147                 tasklet_kill(&q->tasklet);
1148
1149         for_each_output_queue(irq_ptr, q, i) {
1150                 del_timer_sync(&q->u.out.timer);
1151                 tasklet_kill(&q->tasklet);
1152         }
1153 }
1154
1155 /**
1156  * qdio_shutdown - shut down a qdio subchannel
1157  * @cdev: associated ccw device
1158  * @how: use halt or clear to shutdown
1159  */
1160 int qdio_shutdown(struct ccw_device *cdev, int how)
1161 {
1162         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1163         struct subchannel_id schid;
1164         int rc;
1165
1166         if (!irq_ptr)
1167                 return -ENODEV;
1168
1169         WARN_ON_ONCE(irqs_disabled());
1170         ccw_device_get_schid(cdev, &schid);
1171         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1172
1173         mutex_lock(&irq_ptr->setup_mutex);
1174         /*
1175          * Subchannel was already shot down. We cannot prevent being called
1176          * twice since cio may trigger a shutdown asynchronously.
1177          */
1178         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1179                 mutex_unlock(&irq_ptr->setup_mutex);
1180                 return 0;
1181         }
1182
1183         /*
1184          * Indicate that the device is going down. Scheduling the queue
1185          * tasklets is forbidden from here on.
1186          */
1187         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1188
1189         tiqdio_remove_input_queues(irq_ptr);
1190         qdio_shutdown_queues(cdev);
1191         qdio_shutdown_debug_entries(irq_ptr);
1192
1193         /* cleanup subchannel */
1194         spin_lock_irq(get_ccwdev_lock(cdev));
1195
1196         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1197                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1198         else
1199                 /* default behaviour is halt */
1200                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1201         if (rc) {
1202                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1203                 DBF_ERROR("rc:%4d", rc);
1204                 goto no_cleanup;
1205         }
1206
1207         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1208         spin_unlock_irq(get_ccwdev_lock(cdev));
1209         wait_event_interruptible_timeout(cdev->private->wait_q,
1210                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1211                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1212                 10 * HZ);
1213         spin_lock_irq(get_ccwdev_lock(cdev));
1214
1215 no_cleanup:
1216         qdio_shutdown_thinint(irq_ptr);
1217
1218         /* restore interrupt handler */
1219         if ((void *)cdev->handler == (void *)qdio_int_handler)
1220                 cdev->handler = irq_ptr->orig_handler;
1221         spin_unlock_irq(get_ccwdev_lock(cdev));
1222
1223         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1224         mutex_unlock(&irq_ptr->setup_mutex);
1225         if (rc)
1226                 return rc;
1227         return 0;
1228 }
1229 EXPORT_SYMBOL_GPL(qdio_shutdown);
1230
1231 /**
1232  * qdio_free - free data structures for a qdio subchannel
1233  * @cdev: associated ccw device
1234  */
1235 int qdio_free(struct ccw_device *cdev)
1236 {
1237         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1238         struct subchannel_id schid;
1239
1240         if (!irq_ptr)
1241                 return -ENODEV;
1242
1243         ccw_device_get_schid(cdev, &schid);
1244         DBF_EVENT("qfree:%4x", schid.sch_no);
1245         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1246         mutex_lock(&irq_ptr->setup_mutex);
1247
1248         irq_ptr->debug_area = NULL;
1249         cdev->private->qdio_data = NULL;
1250         mutex_unlock(&irq_ptr->setup_mutex);
1251
1252         qdio_release_memory(irq_ptr);
1253         return 0;
1254 }
1255 EXPORT_SYMBOL_GPL(qdio_free);
1256
1257 /**
1258  * qdio_allocate - allocate qdio queues and associated data
1259  * @init_data: initialization data
1260  */
1261 int qdio_allocate(struct qdio_initialize *init_data)
1262 {
1263         struct subchannel_id schid;
1264         struct qdio_irq *irq_ptr;
1265
1266         ccw_device_get_schid(init_data->cdev, &schid);
1267         DBF_EVENT("qallocate:%4x", schid.sch_no);
1268
1269         if ((init_data->no_input_qs && !init_data->input_handler) ||
1270             (init_data->no_output_qs && !init_data->output_handler))
1271                 return -EINVAL;
1272
1273         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1274             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1275                 return -EINVAL;
1276
1277         if ((!init_data->input_sbal_addr_array) ||
1278             (!init_data->output_sbal_addr_array))
1279                 return -EINVAL;
1280
1281         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1282         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1283         if (!irq_ptr)
1284                 goto out_err;
1285
1286         mutex_init(&irq_ptr->setup_mutex);
1287         if (qdio_allocate_dbf(init_data, irq_ptr))
1288                 goto out_rel;
1289
1290         /*
1291          * Allocate a page for the chsc calls in qdio_establish.
1292          * Must be pre-allocated since a zfcp recovery will call
1293          * qdio_establish. In case of low memory and swap on a zfcp disk
1294          * we may not be able to allocate memory otherwise.
1295          */
1296         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1297         if (!irq_ptr->chsc_page)
1298                 goto out_rel;
1299
1300         /* qdr is used in ccw1.cda which is u32 */
1301         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1302         if (!irq_ptr->qdr)
1303                 goto out_rel;
1304
1305         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1306                              init_data->no_output_qs))
1307                 goto out_rel;
1308
1309         init_data->cdev->private->qdio_data = irq_ptr;
1310         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1311         return 0;
1312 out_rel:
1313         qdio_release_memory(irq_ptr);
1314 out_err:
1315         return -ENOMEM;
1316 }
1317 EXPORT_SYMBOL_GPL(qdio_allocate);
1318
1319 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1320 {
1321         struct qdio_q *q = irq_ptr->input_qs[0];
1322         int i, use_cq = 0;
1323
1324         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1325                 use_cq = 1;
1326
1327         for_each_output_queue(irq_ptr, q, i) {
1328                 if (use_cq) {
1329                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1330                                 use_cq = 0;
1331                                 continue;
1332                         }
1333                 } else
1334                         qdio_disable_async_operation(&q->u.out);
1335         }
1336         DBF_EVENT("use_cq:%d", use_cq);
1337 }
1338
1339 /**
1340  * qdio_establish - establish queues on a qdio subchannel
1341  * @init_data: initialization data
1342  */
1343 int qdio_establish(struct qdio_initialize *init_data)
1344 {
1345         struct ccw_device *cdev = init_data->cdev;
1346         struct subchannel_id schid;
1347         struct qdio_irq *irq_ptr;
1348         int rc;
1349
1350         ccw_device_get_schid(cdev, &schid);
1351         DBF_EVENT("qestablish:%4x", schid.sch_no);
1352
1353         irq_ptr = cdev->private->qdio_data;
1354         if (!irq_ptr)
1355                 return -ENODEV;
1356
1357         mutex_lock(&irq_ptr->setup_mutex);
1358         qdio_setup_irq(init_data);
1359
1360         rc = qdio_establish_thinint(irq_ptr);
1361         if (rc) {
1362                 mutex_unlock(&irq_ptr->setup_mutex);
1363                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1364                 return rc;
1365         }
1366
1367         /* establish q */
1368         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1369         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1370         irq_ptr->ccw.count = irq_ptr->equeue.count;
1371         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1372
1373         spin_lock_irq(get_ccwdev_lock(cdev));
1374         ccw_device_set_options_mask(cdev, 0);
1375
1376         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1377         spin_unlock_irq(get_ccwdev_lock(cdev));
1378         if (rc) {
1379                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1380                 DBF_ERROR("rc:%4x", rc);
1381                 mutex_unlock(&irq_ptr->setup_mutex);
1382                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1383                 return rc;
1384         }
1385
1386         wait_event_interruptible_timeout(cdev->private->wait_q,
1387                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1388                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1389
1390         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1391                 mutex_unlock(&irq_ptr->setup_mutex);
1392                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1393                 return -EIO;
1394         }
1395
1396         qdio_setup_ssqd_info(irq_ptr);
1397
1398         qdio_detect_hsicq(irq_ptr);
1399
1400         /* qebsm is now setup if available, initialize buffer states */
1401         qdio_init_buf_states(irq_ptr);
1402
1403         mutex_unlock(&irq_ptr->setup_mutex);
1404         qdio_print_subchannel_info(irq_ptr, cdev);
1405         qdio_setup_debug_entries(irq_ptr, cdev);
1406         return 0;
1407 }
1408 EXPORT_SYMBOL_GPL(qdio_establish);
1409
1410 /**
1411  * qdio_activate - activate queues on a qdio subchannel
1412  * @cdev: associated cdev
1413  */
1414 int qdio_activate(struct ccw_device *cdev)
1415 {
1416         struct subchannel_id schid;
1417         struct qdio_irq *irq_ptr;
1418         int rc;
1419
1420         ccw_device_get_schid(cdev, &schid);
1421         DBF_EVENT("qactivate:%4x", schid.sch_no);
1422
1423         irq_ptr = cdev->private->qdio_data;
1424         if (!irq_ptr)
1425                 return -ENODEV;
1426
1427         mutex_lock(&irq_ptr->setup_mutex);
1428         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1429                 rc = -EBUSY;
1430                 goto out;
1431         }
1432
1433         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1434         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1435         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1436         irq_ptr->ccw.cda = 0;
1437
1438         spin_lock_irq(get_ccwdev_lock(cdev));
1439         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1440
1441         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1442                               0, DOIO_DENY_PREFETCH);
1443         spin_unlock_irq(get_ccwdev_lock(cdev));
1444         if (rc) {
1445                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1446                 DBF_ERROR("rc:%4x", rc);
1447                 goto out;
1448         }
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 if (count < QDIO_MAX_BUFFERS_PER_Q &&
1580                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1581                    state == SLSB_CU_OUTPUT_PRIMED) {
1582                 /* The previous buffer is not processed yet, tack on. */
1583                 qperf_inc(q, fast_requeue);
1584         } else {
1585                 rc = qdio_kick_outbound_q(q, 0);
1586         }
1587
1588         /* in case of SIGA errors we must process the error immediately */
1589         if (used >= q->u.out.scan_threshold || rc)
1590                 qdio_tasklet_schedule(q);
1591         else
1592                 /* free the SBALs in case of no further traffic */
1593                 if (!timer_pending(&q->u.out.timer) &&
1594                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1595                         mod_timer(&q->u.out.timer, jiffies + HZ);
1596         return rc;
1597 }
1598
1599 /**
1600  * do_QDIO - process input or output buffers
1601  * @cdev: associated ccw_device for the qdio subchannel
1602  * @callflags: input or output and special flags from the program
1603  * @q_nr: queue number
1604  * @bufnr: buffer number
1605  * @count: how many buffers to process
1606  */
1607 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1608             int q_nr, unsigned int bufnr, unsigned int count)
1609 {
1610         struct qdio_irq *irq_ptr;
1611
1612         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1613                 return -EINVAL;
1614
1615         irq_ptr = cdev->private->qdio_data;
1616         if (!irq_ptr)
1617                 return -ENODEV;
1618
1619         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1620                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1621
1622         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1623                 return -EIO;
1624         if (!count)
1625                 return 0;
1626         if (callflags & QDIO_FLAG_SYNC_INPUT)
1627                 return handle_inbound(irq_ptr->input_qs[q_nr],
1628                                       callflags, bufnr, count);
1629         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1630                 return handle_outbound(irq_ptr->output_qs[q_nr],
1631                                        callflags, bufnr, count);
1632         return -EINVAL;
1633 }
1634 EXPORT_SYMBOL_GPL(do_QDIO);
1635
1636 /**
1637  * qdio_start_irq - process input buffers
1638  * @cdev: associated ccw_device for the qdio subchannel
1639  * @nr: input queue number
1640  *
1641  * Return codes
1642  *   0 - success
1643  *   1 - irqs not started since new data is available
1644  */
1645 int qdio_start_irq(struct ccw_device *cdev, int nr)
1646 {
1647         struct qdio_q *q;
1648         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1649
1650         if (!irq_ptr)
1651                 return -ENODEV;
1652         q = irq_ptr->input_qs[nr];
1653
1654         clear_nonshared_ind(irq_ptr);
1655         qdio_stop_polling(q);
1656         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1657
1658         /*
1659          * We need to check again to not lose initiative after
1660          * resetting the ACK state.
1661          */
1662         if (test_nonshared_ind(irq_ptr))
1663                 goto rescan;
1664         if (!qdio_inbound_q_done(q))
1665                 goto rescan;
1666         return 0;
1667
1668 rescan:
1669         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1670                              &q->u.in.queue_irq_state))
1671                 return 0;
1672         else
1673                 return 1;
1674
1675 }
1676 EXPORT_SYMBOL(qdio_start_irq);
1677
1678 /**
1679  * qdio_get_next_buffers - process input buffers
1680  * @cdev: associated ccw_device for the qdio subchannel
1681  * @nr: input queue number
1682  * @bufnr: first filled buffer number
1683  * @error: buffers are in error state
1684  *
1685  * Return codes
1686  *   < 0 - error
1687  *   = 0 - no new buffers found
1688  *   > 0 - number of processed buffers
1689  */
1690 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1691                           int *error)
1692 {
1693         struct qdio_q *q;
1694         int start, end;
1695         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1696
1697         if (!irq_ptr)
1698                 return -ENODEV;
1699         q = irq_ptr->input_qs[nr];
1700
1701         /*
1702          * Cannot rely on automatic sync after interrupt since queues may
1703          * also be examined without interrupt.
1704          */
1705         if (need_siga_sync(q))
1706                 qdio_sync_queues(q);
1707
1708         /* check the PCI capable outbound queues. */
1709         qdio_check_outbound_after_thinint(q);
1710
1711         if (!qdio_inbound_q_moved(q))
1712                 return 0;
1713
1714         /* Note: upper-layer MUST stop processing immediately here ... */
1715         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1716                 return -EIO;
1717
1718         start = q->first_to_kick;
1719         end = q->first_to_check;
1720         *bufnr = start;
1721         *error = q->qdio_error;
1722
1723         /* for the next time */
1724         q->first_to_kick = end;
1725         q->qdio_error = 0;
1726         return sub_buf(end, start);
1727 }
1728 EXPORT_SYMBOL(qdio_get_next_buffers);
1729
1730 /**
1731  * qdio_stop_irq - disable interrupt processing for the device
1732  * @cdev: associated ccw_device for the qdio subchannel
1733  * @nr: input queue number
1734  *
1735  * Return codes
1736  *   0 - interrupts were already disabled
1737  *   1 - interrupts successfully disabled
1738  */
1739 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1740 {
1741         struct qdio_q *q;
1742         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1743
1744         if (!irq_ptr)
1745                 return -ENODEV;
1746         q = irq_ptr->input_qs[nr];
1747
1748         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1749                              &q->u.in.queue_irq_state))
1750                 return 0;
1751         else
1752                 return 1;
1753 }
1754 EXPORT_SYMBOL(qdio_stop_irq);
1755
1756 /**
1757  * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1758  * @schid:              Subchannel ID.
1759  * @cnc:                Boolean Change-Notification Control
1760  * @response:           Response code will be stored at this address
1761  * @cb:                 Callback function will be executed for each element
1762  *                      of the address list
1763  * @priv:               Pointer passed from the caller to qdio_pnso_brinfo()
1764  * @type:               Type of the address entry passed to the callback
1765  * @entry:              Entry containg the address of the specified type
1766  * @priv:               Pointer to pass to the callback function.
1767  *
1768  * Performs "Store-network-bridging-information list" operation and calls
1769  * the callback function for every entry in the list. If "change-
1770  * notification-control" is set, further changes in the address list
1771  * will be reported via the IPA command.
1772  */
1773 int qdio_pnso_brinfo(struct subchannel_id schid,
1774                 int cnc, u16 *response,
1775                 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1776                                 void *entry),
1777                 void *priv)
1778 {
1779         struct chsc_pnso_area *rr;
1780         int rc;
1781         u32 prev_instance = 0;
1782         int isfirstblock = 1;
1783         int i, size, elems;
1784
1785         rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1786         if (rr == NULL)
1787                 return -ENOMEM;
1788         do {
1789                 /* on the first iteration, naihdr.resume_token will be zero */
1790                 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1791                 if (rc != 0 && rc != -EBUSY)
1792                         goto out;
1793                 if (rr->response.code != 1) {
1794                         rc = -EIO;
1795                         continue;
1796                 } else
1797                         rc = 0;
1798
1799                 if (cb == NULL)
1800                         continue;
1801
1802                 size = rr->naihdr.naids;
1803                 elems = (rr->response.length -
1804                                 sizeof(struct chsc_header) -
1805                                 sizeof(struct chsc_brinfo_naihdr)) /
1806                                 size;
1807
1808                 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1809                         /* Inform the caller that they need to scrap */
1810                         /* the data that was already reported via cb */
1811                                 rc = -EAGAIN;
1812                                 break;
1813                 }
1814                 isfirstblock = 0;
1815                 prev_instance = rr->naihdr.instance;
1816                 for (i = 0; i < elems; i++)
1817                         switch (size) {
1818                         case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1819                                 (*cb)(priv, l3_ipv6_addr,
1820                                                 &rr->entries.l3_ipv6[i]);
1821                                 break;
1822                         case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1823                                 (*cb)(priv, l3_ipv4_addr,
1824                                                 &rr->entries.l3_ipv4[i]);
1825                                 break;
1826                         case sizeof(struct qdio_brinfo_entry_l2):
1827                                 (*cb)(priv, l2_addr_lnid,
1828                                                 &rr->entries.l2[i]);
1829                                 break;
1830                         default:
1831                                 WARN_ON_ONCE(1);
1832                                 rc = -EIO;
1833                                 goto out;
1834                         }
1835         } while (rr->response.code == 0x0107 ||  /* channel busy */
1836                   (rr->response.code == 1 && /* list stored */
1837                    /* resume token is non-zero => list incomplete */
1838                    (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1839         (*response) = rr->response.code;
1840
1841 out:
1842         free_page((unsigned long)rr);
1843         return rc;
1844 }
1845 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1846
1847 static int __init init_QDIO(void)
1848 {
1849         int rc;
1850
1851         rc = qdio_debug_init();
1852         if (rc)
1853                 return rc;
1854         rc = qdio_setup_init();
1855         if (rc)
1856                 goto out_debug;
1857         rc = tiqdio_allocate_memory();
1858         if (rc)
1859                 goto out_cache;
1860         rc = tiqdio_register_thinints();
1861         if (rc)
1862                 goto out_ti;
1863         return 0;
1864
1865 out_ti:
1866         tiqdio_free_memory();
1867 out_cache:
1868         qdio_setup_exit();
1869 out_debug:
1870         qdio_debug_exit();
1871         return rc;
1872 }
1873
1874 static void __exit exit_QDIO(void)
1875 {
1876         tiqdio_unregister_thinints();
1877         tiqdio_free_memory();
1878         qdio_setup_exit();
1879         qdio_debug_exit();
1880 }
1881
1882 module_init(init_QDIO);
1883 module_exit(exit_QDIO);