drivers/s390/cio/qdio_main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   4  *
   5  * Copyright IBM Corp. 2000, 2008
   6  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   7  *            Jan Glauber <jang@linux.vnet.ibm.com>
   8  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   9  */
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/timer.h>
  14 #include <linux/delay.h>
  15 #include <linux/gfp.h>
  16 #include <linux/io.h>
  17 #include <linux/atomic.h>
  18 #include <asm/debug.h>
  19 #include <asm/qdio.h>
  20 #include <asm/ipl.h>
  21
  22 #include "cio.h"
  23 #include "css.h"
  24 #include "device.h"
  25 #include "qdio.h"
  26 #include "qdio_debug.h"
  27
  28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  29         "Jan Glauber <jang@linux.vnet.ibm.com>");
  30 MODULE_DESCRIPTION("QDIO base support");
  31 MODULE_LICENSE("GPL");
  32
  33 static inline int do_siga_sync(unsigned long schid,
  34                                unsigned int out_mask, unsigned int in_mask,
  35                                unsigned int fc)
  36 {
  37         register unsigned long __fc asm ("0") = fc;
  38         register unsigned long __schid asm ("1") = schid;
  39         register unsigned long out asm ("2") = out_mask;
  40         register unsigned long in asm ("3") = in_mask;
  41         int cc;
  42
  43         asm volatile(
  44                 "       siga    0\n"
  45                 "       ipm     %0\n"
  46                 "       srl     %0,28\n"
  47                 : "=d" (cc)
  48                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  49         return cc;
  50 }
  51
  52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  53                                 unsigned int fc)
  54 {
  55         register unsigned long __fc asm ("0") = fc;
  56         register unsigned long __schid asm ("1") = schid;
  57         register unsigned long __mask asm ("2") = mask;
  58         int cc;
  59
  60         asm volatile(
  61                 "       siga    0\n"
  62                 "       ipm     %0\n"
  63                 "       srl     %0,28\n"
  64                 : "=d" (cc)
  65                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  66         return cc;
  67 }
  68
  69 /**
  70  * do_siga_output - perform SIGA-w/wt function
  71  * @schid: subchannel id or in case of QEBSM the subchannel token
  72  * @mask: which output queues to process
  73  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  74  * @fc: function code to perform
  75  * @aob: asynchronous operation block
  76  *
  77  * Returns condition code.
  78  * Note: For IQDC unicast queues only the highest priority queue is processed.
  79  */
  80 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  81                                  unsigned int *bb, unsigned int fc,
  82                                  unsigned long aob)
  83 {
  84         register unsigned long __fc asm("0") = fc;
  85         register unsigned long __schid asm("1") = schid;
  86         register unsigned long __mask asm("2") = mask;
  87         register unsigned long __aob asm("3") = aob;
  88         int cc;
  89
  90         asm volatile(
  91                 "       siga    0\n"
  92                 "       ipm     %0\n"
  93                 "       srl     %0,28\n"
  94                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  95                 : "d" (__schid), "d" (__mask)
  96                 : "cc");
  97         *bb = __fc >> 31;
  98         return cc;
  99 }
 100
 101 /**
 102  * qdio_do_eqbs - extract buffer states for QEBSM
 103  * @q: queue to manipulate
 104  * @state: state of the extracted buffers
 105  * @start: buffer number to start at
 106  * @count: count of buffers to examine
 107  * @auto_ack: automatically acknowledge buffers
 108  *
 109  * Returns the number of successfully extracted equal buffer states.
 110  * Stops processing if a state is different from the last buffers state.
 111  */
 112 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 113                         int start, int count, int auto_ack)
 114 {
 115         int tmp_count = count, tmp_start = start, nr = q->nr;
 116         unsigned int ccq = 0;
 117
 118         qperf_inc(q, eqbs);
 119
 120         if (!q->is_input_q)
 121                 nr += q->irq_ptr->nr_input_qs;
 122 again:
 123         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 124                       auto_ack);
 125
 126         switch (ccq) {
 127         case 0:
 128         case 32:
 129                 /* all done, or next buffer state different */
 130                 return count - tmp_count;
 131         case 96:
 132                 /* not all buffers processed */
 133                 qperf_inc(q, eqbs_partial);
 134                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "EQBS part:%02x",
 135                         tmp_count);
 136                 return count - tmp_count;
 137         case 97:
 138                 /* no buffer processed */
 139                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 140                 goto again;
 141         default:
 142                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 143                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 144                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 145                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr,
 146                            q->first_to_check, count, q->irq_ptr->int_parm);
 147                 return 0;
 148         }
 149 }
 150
 151 /**
 152  * qdio_do_sqbs - set buffer states for QEBSM
 153  * @q: queue to manipulate
 154  * @state: new state of the buffers
 155  * @start: first buffer number to change
 156  * @count: how many buffers to change
 157  *
 158  * Returns the number of successfully changed buffers.
 159  * Does retrying until the specified count of buffer states is set or an
 160  * error occurs.
 161  */
 162 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 163                         int count)
 164 {
 165         unsigned int ccq = 0;
 166         int tmp_count = count, tmp_start = start;
 167         int nr = q->nr;
 168
 169         if (!count)
 170                 return 0;
 171         qperf_inc(q, sqbs);
 172
 173         if (!q->is_input_q)
 174                 nr += q->irq_ptr->nr_input_qs;
 175 again:
 176         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 177
 178         switch (ccq) {
 179         case 0:
 180         case 32:
 181                 /* all done, or active buffer adapter-owned */
 182                 WARN_ON_ONCE(tmp_count);
 183                 return count - tmp_count;
 184         case 96:
 185                 /* not all buffers processed */
 186                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 187                 qperf_inc(q, sqbs_partial);
 188                 goto again;
 189         default:
 190                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 191                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 192                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 193                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr,
 194                            q->first_to_check, count, q->irq_ptr->int_parm);
 195                 return 0;
 196         }
 197 }
 198
 199 /*
 200  * Returns number of examined buffers and their common state in *state.
 201  * Requested number of buffers-to-examine must be > 0.
 202  */
 203 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 204                                  unsigned char *state, unsigned int count,
 205                                  int auto_ack, int merge_pending)
 206 {
 207         unsigned char __state = 0;
 208         int i = 1;
 209
 210         if (is_qebsm(q))
 211                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 212
 213         /* get initial state: */
 214         __state = q->slsb.val[bufnr];
 215
 216         /* Bail out early if there is no work on the queue: */
 217         if (__state & SLSB_OWNER_CU)
 218                 goto out;
 219
 220         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 221                 __state = SLSB_P_OUTPUT_EMPTY;
 222
 223         for (; i < count; i++) {
 224                 bufnr = next_buf(bufnr);
 225
 226                 /* merge PENDING into EMPTY: */
 227                 if (merge_pending &&
 228                     q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING &&
 229                     __state == SLSB_P_OUTPUT_EMPTY)
 230                         continue;
 231
 232                 /* stop if next state differs from initial state: */
 233                 if (q->slsb.val[bufnr] != __state)
 234                         break;
 235         }
 236
 237 out:
 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         /* Ensure that all preceding changes to the SBALs are visible: */
 258         mb();
 259
 260         for (i = 0; i < count; i++) {
 261                 WRITE_ONCE(q->slsb.val[bufnr], state);
 262                 bufnr = next_buf(bufnr);
 263         }
 264
 265         /* Make our SLSB changes visible: */
 266         mb();
 267
 268         return count;
 269 }
 270
 271 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 272                                 unsigned char state)
 273 {
 274         return set_buf_states(q, bufnr, state, 1);
 275 }
 276
 277 /* set slsb states to initial state */
 278 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 279 {
 280         struct qdio_q *q;
 281         int i;
 282
 283         for_each_input_queue(irq_ptr, q, i)
 284                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 285                                QDIO_MAX_BUFFERS_PER_Q);
 286         for_each_output_queue(irq_ptr, q, i)
 287                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 288                                QDIO_MAX_BUFFERS_PER_Q);
 289 }
 290
 291 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 292                           unsigned int input)
 293 {
 294         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 295         unsigned int fc = QDIO_SIGA_SYNC;
 296         int cc;
 297
 298         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 299         qperf_inc(q, siga_sync);
 300
 301         if (is_qebsm(q)) {
 302                 schid = q->irq_ptr->sch_token;
 303                 fc |= QDIO_SIGA_QEBSM_FLAG;
 304         }
 305
 306         cc = do_siga_sync(schid, output, input, fc);
 307         if (unlikely(cc))
 308                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 309         return (cc) ? -EIO : 0;
 310 }
 311
 312 static inline int qdio_siga_sync_q(struct qdio_q *q)
 313 {
 314         if (q->is_input_q)
 315                 return qdio_siga_sync(q, 0, q->mask);
 316         else
 317                 return qdio_siga_sync(q, q->mask, 0);
 318 }
 319
 320 static int qdio_siga_output(struct qdio_q *q, unsigned int count,
 321                             unsigned int *busy_bit, unsigned long aob)
 322 {
 323         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 324         unsigned int fc = QDIO_SIGA_WRITE;
 325         u64 start_time = 0;
 326         int retries = 0, cc;
 327
 328         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
 329                 if (count > 1)
 330                         fc = QDIO_SIGA_WRITEM;
 331                 else if (aob)
 332                         fc = QDIO_SIGA_WRITEQ;
 333         }
 334
 335         if (is_qebsm(q)) {
 336                 schid = q->irq_ptr->sch_token;
 337                 fc |= QDIO_SIGA_QEBSM_FLAG;
 338         }
 339 again:
 340         cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
 341
 342         /* hipersocket busy condition */
 343         if (unlikely(*busy_bit)) {
 344                 retries++;
 345
 346                 if (!start_time) {
 347                         start_time = get_tod_clock_fast();
 348                         goto again;
 349                 }
 350                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 351                         goto again;
 352         }
 353         if (retries) {
 354                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 355                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 356                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 357         }
 358         return cc;
 359 }
 360
 361 static inline int qdio_siga_input(struct qdio_q *q)
 362 {
 363         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 364         unsigned int fc = QDIO_SIGA_READ;
 365         int cc;
 366
 367         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 368         qperf_inc(q, siga_read);
 369
 370         if (is_qebsm(q)) {
 371                 schid = q->irq_ptr->sch_token;
 372                 fc |= QDIO_SIGA_QEBSM_FLAG;
 373         }
 374
 375         cc = do_siga_input(schid, q->mask, fc);
 376         if (unlikely(cc))
 377                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 378         return (cc) ? -EIO : 0;
 379 }
 380
 381 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 382 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 383
 384 static inline void qdio_sync_queues(struct qdio_q *q)
 385 {
 386         /* PCI capable outbound queues will also be scanned so sync them too */
 387         if (pci_out_supported(q->irq_ptr))
 388                 qdio_siga_sync_all(q);
 389         else
 390                 qdio_siga_sync_q(q);
 391 }
 392
 393 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 394                         unsigned char *state)
 395 {
 396         if (need_siga_sync(q))
 397                 qdio_siga_sync_q(q);
 398         return get_buf_state(q, bufnr, state, 0);
 399 }
 400
 401 static inline void qdio_stop_polling(struct qdio_q *q)
 402 {
 403         if (!q->u.in.batch_count)
 404                 return;
 405
 406         qperf_inc(q, stop_polling);
 407
 408         /* show the card that we are not polling anymore */
 409         set_buf_states(q, q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT,
 410                        q->u.in.batch_count);
 411         q->u.in.batch_count = 0;
 412 }
 413
 414 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 415 {
 416         q->q_stats.nr_sbal_total += count;
 417         q->q_stats.nr_sbals[ilog2(count)]++;
 418 }
 419
 420 static void process_buffer_error(struct qdio_q *q, unsigned int start,
 421                                  int count)
 422 {
 423         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 424
 425         /* special handling for no target buffer empty */
 426         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 427             q->sbal[start]->element[15].sflags == 0x10) {
 428                 qperf_inc(q, target_full);
 429                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
 430                 return;
 431         }
 432
 433         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 434         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 435         DBF_ERROR("FTC:%3d C:%3d", start, count);
 436         DBF_ERROR("F14:%2x F15:%2x",
 437                   q->sbal[start]->element[14].sflags,
 438                   q->sbal[start]->element[15].sflags);
 439 }
 440
 441 static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
 442                                        int count, bool auto_ack)
 443 {
 444         /* ACK the newest SBAL: */
 445         if (!auto_ack)
 446                 set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK);
 447
 448         if (!q->u.in.batch_count)
 449                 q->u.in.batch_start = start;
 450         q->u.in.batch_count += count;
 451 }
 452
 453 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 454 {
 455         unsigned char state = 0;
 456         int count;
 457
 458         q->timestamp = get_tod_clock_fast();
 459
 460         count = atomic_read(&q->nr_buf_used);
 461         if (!count)
 462                 return 0;
 463
 464         /*
 465          * No siga sync here, as a PCI or we after a thin interrupt
 466          * already sync'ed the queues.
 467          */
 468         count = get_buf_states(q, start, &state, count, 1, 0);
 469         if (!count)
 470                 return 0;
 471
 472         switch (state) {
 473         case SLSB_P_INPUT_PRIMED:
 474                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
 475                               count);
 476
 477                 inbound_handle_work(q, start, count, is_qebsm(q));
 478                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 479                         qperf_inc(q, inbound_queue_full);
 480                 if (q->irq_ptr->perf_stat_enabled)
 481                         account_sbals(q, count);
 482                 return count;
 483         case SLSB_P_INPUT_ERROR:
 484                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
 485                               count);
 486
 487                 process_buffer_error(q, start, count);
 488                 inbound_handle_work(q, start, count, false);
 489                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 490                         qperf_inc(q, inbound_queue_full);
 491                 if (q->irq_ptr->perf_stat_enabled)
 492                         account_sbals_error(q, count);
 493                 return count;
 494         case SLSB_CU_INPUT_EMPTY:
 495                 if (q->irq_ptr->perf_stat_enabled)
 496                         q->q_stats.nr_sbal_nop++;
 497                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 498                               q->nr, start);
 499                 return 0;
 500         case SLSB_P_INPUT_NOT_INIT:
 501         case SLSB_P_INPUT_ACK:
 502                 /* We should never see this state, throw a WARN: */
 503         default:
 504                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 505                               "found state %#x at index %u on queue %u\n",
 506                               state, start, q->nr);
 507                 return 0;
 508         }
 509 }
 510
 511 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start)
 512 {
 513         return get_inbound_buffer_frontier(q, start);
 514 }
 515
 516 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 517 {
 518         unsigned char state = 0;
 519
 520         if (!atomic_read(&q->nr_buf_used))
 521                 return 1;
 522
 523         if (need_siga_sync(q))
 524                 qdio_siga_sync_q(q);
 525         get_buf_state(q, start, &state, 0);
 526
 527         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 528                 /* more work coming */
 529                 return 0;
 530
 531         return 1;
 532 }
 533
 534 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 535                                         int bufnr)
 536 {
 537         unsigned long phys_aob = 0;
 538
 539         if (!q->aobs[bufnr]) {
 540                 struct qaob *aob = qdio_allocate_aob();
 541                 q->aobs[bufnr] = aob;
 542         }
 543         if (q->aobs[bufnr]) {
 544                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 545                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 546                 WARN_ON_ONCE(phys_aob & 0xFF);
 547         }
 548
 549         q->sbal_state[bufnr].flags = 0;
 550         return phys_aob;
 551 }
 552
 553 static void qdio_kick_handler(struct qdio_q *q, unsigned int start,
 554                               unsigned int count)
 555 {
 556         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 557                 return;
 558
 559         if (q->is_input_q) {
 560                 qperf_inc(q, inbound_handler);
 561                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 562         } else {
 563                 qperf_inc(q, outbound_handler);
 564                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 565                               start, count);
 566         }
 567
 568         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 569                    q->irq_ptr->int_parm);
 570
 571         /* for the next time */
 572         q->qdio_error = 0;
 573 }
 574
 575 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 576 {
 577         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 578                 tasklet_schedule(&q->tasklet);
 579                 return 0;
 580         }
 581         return -EPERM;
 582 }
 583
 584 static void __qdio_inbound_processing(struct qdio_q *q)
 585 {
 586         unsigned int start = q->first_to_check;
 587         int count;
 588
 589         qperf_inc(q, tasklet_inbound);
 590
 591         count = qdio_inbound_q_moved(q, start);
 592         if (count == 0)
 593                 return;
 594
 595         qdio_kick_handler(q, start, count);
 596         start = add_buf(start, count);
 597         q->first_to_check = start;
 598
 599         if (!qdio_inbound_q_done(q, start)) {
 600                 /* means poll time is not yet over */
 601                 qperf_inc(q, tasklet_inbound_resched);
 602                 if (!qdio_tasklet_schedule(q))
 603                         return;
 604         }
 605
 606         qdio_stop_polling(q);
 607         /*
 608          * We need to check again to not lose initiative after
 609          * resetting the ACK state.
 610          */
 611         if (!qdio_inbound_q_done(q, start)) {
 612                 qperf_inc(q, tasklet_inbound_resched2);
 613                 qdio_tasklet_schedule(q);
 614         }
 615 }
 616
 617 void qdio_inbound_processing(unsigned long data)
 618 {
 619         struct qdio_q *q = (struct qdio_q *)data;
 620         __qdio_inbound_processing(q);
 621 }
 622
 623 static void qdio_check_pending(struct qdio_q *q, unsigned int index)
 624 {
 625         unsigned char state;
 626
 627         if (get_buf_state(q, index, &state, 0) > 0 &&
 628             state == SLSB_P_OUTPUT_PENDING &&
 629             q->u.out.aobs[index]) {
 630                 q->u.out.sbal_state[index].flags |=
 631                         QDIO_OUTBUF_STATE_FLAG_PENDING;
 632                 q->u.out.aobs[index] = NULL;
 633         }
 634 }
 635
 636 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 637 {
 638         unsigned char state = 0;
 639         int count;
 640
 641         q->timestamp = get_tod_clock_fast();
 642
 643         if (need_siga_sync(q))
 644                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 645                     !pci_out_supported(q->irq_ptr)) ||
 646                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 647                     multicast_outbound(q)))
 648                         qdio_siga_sync_q(q);
 649
 650         count = atomic_read(&q->nr_buf_used);
 651         if (!count)
 652                 return 0;
 653
 654         count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
 655         if (!count)
 656                 return 0;
 657
 658         switch (state) {
 659         case SLSB_P_OUTPUT_EMPTY:
 660         case SLSB_P_OUTPUT_PENDING:
 661                 /* the adapter got it */
 662                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 663                         "out empty:%1d %02x", q->nr, count);
 664
 665                 atomic_sub(count, &q->nr_buf_used);
 666                 if (q->irq_ptr->perf_stat_enabled)
 667                         account_sbals(q, count);
 668                 return count;
 669         case SLSB_P_OUTPUT_ERROR:
 670                 process_buffer_error(q, start, count);
 671                 atomic_sub(count, &q->nr_buf_used);
 672                 if (q->irq_ptr->perf_stat_enabled)
 673                         account_sbals_error(q, count);
 674                 return count;
 675         case SLSB_CU_OUTPUT_PRIMED:
 676                 /* the adapter has not fetched the output yet */
 677                 if (q->irq_ptr->perf_stat_enabled)
 678                         q->q_stats.nr_sbal_nop++;
 679                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 680                               q->nr);
 681                 return 0;
 682         case SLSB_P_OUTPUT_HALTED:
 683                 return 0;
 684         case SLSB_P_OUTPUT_NOT_INIT:
 685                 /* We should never see this state, throw a WARN: */
 686         default:
 687                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 688                               "found state %#x at index %u on queue %u\n",
 689                               state, start, q->nr);
 690                 return 0;
 691         }
 692 }
 693
 694 /* all buffers processed? */
 695 static inline int qdio_outbound_q_done(struct qdio_q *q)
 696 {
 697         return atomic_read(&q->nr_buf_used) == 0;
 698 }
 699
 700 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
 701 {
 702         int count;
 703
 704         count = get_outbound_buffer_frontier(q, start);
 705
 706         if (count) {
 707                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 708
 709                 if (q->u.out.use_cq) {
 710                         unsigned int i;
 711
 712                         for (i = 0; i < count; i++)
 713                                 qdio_check_pending(q, QDIO_BUFNR(start + i));
 714                 }
 715         }
 716
 717         return count;
 718 }
 719
 720 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 721                                 unsigned long aob)
 722 {
 723         int retries = 0, cc;
 724         unsigned int busy_bit;
 725
 726         if (!need_siga_out(q))
 727                 return 0;
 728
 729         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 730 retry:
 731         qperf_inc(q, siga_write);
 732
 733         cc = qdio_siga_output(q, count, &busy_bit, aob);
 734         switch (cc) {
 735         case 0:
 736                 break;
 737         case 2:
 738                 if (busy_bit) {
 739                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 740                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 741                                 goto retry;
 742                         }
 743                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 744                         cc = -EBUSY;
 745                 } else {
 746                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 747                         cc = -ENOBUFS;
 748                 }
 749                 break;
 750         case 1:
 751         case 3:
 752                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 753                 cc = -EIO;
 754                 break;
 755         }
 756         if (retries) {
 757                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 758                 DBF_ERROR("count:%u", retries);
 759         }
 760         return cc;
 761 }
 762
 763 static void __qdio_outbound_processing(struct qdio_q *q)
 764 {
 765         unsigned int start = q->first_to_check;
 766         int count;
 767
 768         qperf_inc(q, tasklet_outbound);
 769         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 770
 771         count = qdio_outbound_q_moved(q, start);
 772         if (count) {
 773                 q->first_to_check = add_buf(start, count);
 774                 qdio_kick_handler(q, start, count);
 775         }
 776
 777         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 778             !qdio_outbound_q_done(q))
 779                 goto sched;
 780
 781         if (q->u.out.pci_out_enabled)
 782                 return;
 783
 784         /*
 785          * Now we know that queue type is either qeth without pci enabled
 786          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 787          * is noticed and outbound_handler is called after some time.
 788          */
 789         if (qdio_outbound_q_done(q))
 790                 del_timer_sync(&q->u.out.timer);
 791         else
 792                 if (!timer_pending(&q->u.out.timer) &&
 793                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 794                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 795         return;
 796
 797 sched:
 798         qdio_tasklet_schedule(q);
 799 }
 800
 801 /* outbound tasklet */
 802 void qdio_outbound_processing(unsigned long data)
 803 {
 804         struct qdio_q *q = (struct qdio_q *)data;
 805         __qdio_outbound_processing(q);
 806 }
 807
 808 void qdio_outbound_timer(struct timer_list *t)
 809 {
 810         struct qdio_q *q = from_timer(q, t, u.out.timer);
 811
 812         qdio_tasklet_schedule(q);
 813 }
 814
 815 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 816 {
 817         struct qdio_q *out;
 818         int i;
 819
 820         if (!pci_out_supported(irq) || !irq->scan_threshold)
 821                 return;
 822
 823         for_each_output_queue(irq, out, i)
 824                 if (!qdio_outbound_q_done(out))
 825                         qdio_tasklet_schedule(out);
 826 }
 827
 828 void tiqdio_inbound_processing(unsigned long data)
 829 {
 830         struct qdio_q *q = (struct qdio_q *)data;
 831
 832         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 833                 qdio_sync_queues(q);
 834
 835         /* The interrupt could be caused by a PCI request: */
 836         qdio_check_outbound_pci_queues(q->irq_ptr);
 837
 838         __qdio_inbound_processing(q);
 839 }
 840
 841 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 842                                   enum qdio_irq_states state)
 843 {
 844         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 845
 846         irq_ptr->state = state;
 847         mb();
 848 }
 849
 850 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 851 {
 852         if (irb->esw.esw0.erw.cons) {
 853                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 854                 DBF_ERROR_HEX(irb, 64);
 855                 DBF_ERROR_HEX(irb->ecw, 64);
 856         }
 857 }
 858
 859 /* PCI interrupt handler */
 860 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 861 {
 862         int i;
 863         struct qdio_q *q;
 864
 865         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 866                 return;
 867
 868         if (irq_ptr->irq_poll) {
 869                 if (!test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
 870                         irq_ptr->irq_poll(irq_ptr->cdev, irq_ptr->int_parm);
 871                 else
 872                         QDIO_PERF_STAT_INC(irq_ptr, int_discarded);
 873         } else {
 874                 for_each_input_queue(irq_ptr, q, i)
 875                         tasklet_schedule(&q->tasklet);
 876         }
 877
 878         if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold)
 879                 return;
 880
 881         for_each_output_queue(irq_ptr, q, i) {
 882                 if (qdio_outbound_q_done(q))
 883                         continue;
 884                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 885                         qdio_siga_sync_q(q);
 886                 qdio_tasklet_schedule(q);
 887         }
 888 }
 889
 890 static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
 891                                        unsigned long intparm, int cstat,
 892                                        int dstat)
 893 {
 894         struct qdio_q *q;
 895
 896         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 897         DBF_ERROR("intp :%lx", intparm);
 898         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 899
 900         if (irq_ptr->nr_input_qs) {
 901                 q = irq_ptr->input_qs[0];
 902         } else if (irq_ptr->nr_output_qs) {
 903                 q = irq_ptr->output_qs[0];
 904         } else {
 905                 dump_stack();
 906                 goto no_handler;
 907         }
 908
 909         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
 910                    q->nr, q->first_to_check, 0, irq_ptr->int_parm);
 911 no_handler:
 912         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 913         /*
 914          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
 915          * Therefore we call the LGR detection function here.
 916          */
 917         lgr_info_log();
 918 }
 919
 920 static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat,
 921                                       int dstat)
 922 {
 923         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 924
 925         if (cstat)
 926                 goto error;
 927         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 928                 goto error;
 929         if (!(dstat & DEV_STAT_DEV_END))
 930                 goto error;
 931         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 932         return;
 933
 934 error:
 935         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 936         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 937         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 938 }
 939
 940 /* qdio interrupt handler */
 941 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 942                       struct irb *irb)
 943 {
 944         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 945         struct subchannel_id schid;
 946         int cstat, dstat;
 947
 948         if (!intparm || !irq_ptr) {
 949                 ccw_device_get_schid(cdev, &schid);
 950                 DBF_ERROR("qint:%4x", schid.sch_no);
 951                 return;
 952         }
 953
 954         if (irq_ptr->perf_stat_enabled)
 955                 irq_ptr->perf_stat.qdio_int++;
 956
 957         if (IS_ERR(irb)) {
 958                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 959                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 960                 wake_up(&cdev->private->wait_q);
 961                 return;
 962         }
 963         qdio_irq_check_sense(irq_ptr, irb);
 964         cstat = irb->scsw.cmd.cstat;
 965         dstat = irb->scsw.cmd.dstat;
 966
 967         switch (irq_ptr->state) {
 968         case QDIO_IRQ_STATE_INACTIVE:
 969                 qdio_establish_handle_irq(irq_ptr, cstat, dstat);
 970                 break;
 971         case QDIO_IRQ_STATE_CLEANUP:
 972                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 973                 break;
 974         case QDIO_IRQ_STATE_ESTABLISHED:
 975         case QDIO_IRQ_STATE_ACTIVE:
 976                 if (cstat & SCHN_STAT_PCI) {
 977                         qdio_int_handler_pci(irq_ptr);
 978                         return;
 979                 }
 980                 if (cstat || dstat)
 981                         qdio_handle_activate_check(irq_ptr, intparm, cstat,
 982                                                    dstat);
 983                 break;
 984         case QDIO_IRQ_STATE_STOPPED:
 985                 break;
 986         default:
 987                 WARN_ON_ONCE(1);
 988         }
 989         wake_up(&cdev->private->wait_q);
 990 }
 991
 992 /**
 993  * qdio_get_ssqd_desc - get qdio subchannel description
 994  * @cdev: ccw device to get description for
 995  * @data: where to store the ssqd
 996  *
 997  * Returns 0 or an error code. The results of the chsc are stored in the
 998  * specified structure.
 999  */
1000 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1001                        struct qdio_ssqd_desc *data)
1002 {
1003         struct subchannel_id schid;
1004
1005         if (!cdev || !cdev->private)
1006                 return -EINVAL;
1007
1008         ccw_device_get_schid(cdev, &schid);
1009         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1010         return qdio_setup_get_ssqd(NULL, &schid, data);
1011 }
1012 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1013
1014 static void qdio_shutdown_queues(struct qdio_irq *irq_ptr)
1015 {
1016         struct qdio_q *q;
1017         int i;
1018
1019         for_each_input_queue(irq_ptr, q, i)
1020                 tasklet_kill(&q->tasklet);
1021
1022         for_each_output_queue(irq_ptr, q, i) {
1023                 del_timer_sync(&q->u.out.timer);
1024                 tasklet_kill(&q->tasklet);
1025         }
1026 }
1027
1028 /**
1029  * qdio_shutdown - shut down a qdio subchannel
1030  * @cdev: associated ccw device
1031  * @how: use halt or clear to shutdown
1032  */
1033 int qdio_shutdown(struct ccw_device *cdev, int how)
1034 {
1035         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1036         struct subchannel_id schid;
1037         int rc;
1038
1039         if (!irq_ptr)
1040                 return -ENODEV;
1041
1042         WARN_ON_ONCE(irqs_disabled());
1043         ccw_device_get_schid(cdev, &schid);
1044         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1045
1046         mutex_lock(&irq_ptr->setup_mutex);
1047         /*
1048          * Subchannel was already shot down. We cannot prevent being called
1049          * twice since cio may trigger a shutdown asynchronously.
1050          */
1051         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1052                 mutex_unlock(&irq_ptr->setup_mutex);
1053                 return 0;
1054         }
1055
1056         /*
1057          * Indicate that the device is going down. Scheduling the queue
1058          * tasklets is forbidden from here on.
1059          */
1060         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1061
1062         tiqdio_remove_device(irq_ptr);
1063         qdio_shutdown_queues(irq_ptr);
1064         qdio_shutdown_debug_entries(irq_ptr);
1065
1066         /* cleanup subchannel */
1067         spin_lock_irq(get_ccwdev_lock(cdev));
1068         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1069         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1070                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1071         else
1072                 /* default behaviour is halt */
1073                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1074         spin_unlock_irq(get_ccwdev_lock(cdev));
1075         if (rc) {
1076                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1077                 DBF_ERROR("rc:%4d", rc);
1078                 goto no_cleanup;
1079         }
1080
1081         wait_event_interruptible_timeout(cdev->private->wait_q,
1082                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1083                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1084                 10 * HZ);
1085
1086 no_cleanup:
1087         qdio_shutdown_thinint(irq_ptr);
1088         qdio_shutdown_irq(irq_ptr);
1089
1090         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1091         mutex_unlock(&irq_ptr->setup_mutex);
1092         if (rc)
1093                 return rc;
1094         return 0;
1095 }
1096 EXPORT_SYMBOL_GPL(qdio_shutdown);
1097
1098 /**
1099  * qdio_free - free data structures for a qdio subchannel
1100  * @cdev: associated ccw device
1101  */
1102 int qdio_free(struct ccw_device *cdev)
1103 {
1104         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1105         struct subchannel_id schid;
1106
1107         if (!irq_ptr)
1108                 return -ENODEV;
1109
1110         ccw_device_get_schid(cdev, &schid);
1111         DBF_EVENT("qfree:%4x", schid.sch_no);
1112         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1113         mutex_lock(&irq_ptr->setup_mutex);
1114
1115         irq_ptr->debug_area = NULL;
1116         cdev->private->qdio_data = NULL;
1117         mutex_unlock(&irq_ptr->setup_mutex);
1118
1119         qdio_free_async_data(irq_ptr);
1120         qdio_free_queues(irq_ptr);
1121         free_page((unsigned long) irq_ptr->qdr);
1122         free_page(irq_ptr->chsc_page);
1123         free_page((unsigned long) irq_ptr);
1124         return 0;
1125 }
1126 EXPORT_SYMBOL_GPL(qdio_free);
1127
1128 /**
1129  * qdio_allocate - allocate qdio queues and associated data
1130  * @cdev: associated ccw device
1131  * @no_input_qs: allocate this number of Input Queues
1132  * @no_output_qs: allocate this number of Output Queues
1133  */
1134 int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
1135                   unsigned int no_output_qs)
1136 {
1137         struct subchannel_id schid;
1138         struct qdio_irq *irq_ptr;
1139         int rc = -ENOMEM;
1140
1141         ccw_device_get_schid(cdev, &schid);
1142         DBF_EVENT("qallocate:%4x", schid.sch_no);
1143
1144         if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
1145             no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
1146                 return -EINVAL;
1147
1148         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1149         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1150         if (!irq_ptr)
1151                 return -ENOMEM;
1152
1153         irq_ptr->cdev = cdev;
1154         mutex_init(&irq_ptr->setup_mutex);
1155         if (qdio_allocate_dbf(irq_ptr))
1156                 goto err_dbf;
1157
1158         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
1159                       no_output_qs);
1160
1161         /*
1162          * Allocate a page for the chsc calls in qdio_establish.
1163          * Must be pre-allocated since a zfcp recovery will call
1164          * qdio_establish. In case of low memory and swap on a zfcp disk
1165          * we may not be able to allocate memory otherwise.
1166          */
1167         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1168         if (!irq_ptr->chsc_page)
1169                 goto err_chsc;
1170
1171         /* qdr is used in ccw1.cda which is u32 */
1172         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1173         if (!irq_ptr->qdr)
1174                 goto err_qdr;
1175
1176         rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
1177         if (rc)
1178                 goto err_queues;
1179
1180         INIT_LIST_HEAD(&irq_ptr->entry);
1181         cdev->private->qdio_data = irq_ptr;
1182         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1183         return 0;
1184
1185 err_queues:
1186         free_page((unsigned long) irq_ptr->qdr);
1187 err_qdr:
1188         free_page(irq_ptr->chsc_page);
1189 err_chsc:
1190 err_dbf:
1191         free_page((unsigned long) irq_ptr);
1192         return rc;
1193 }
1194 EXPORT_SYMBOL_GPL(qdio_allocate);
1195
1196 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1197 {
1198         struct qdio_q *q = irq_ptr->input_qs[0];
1199         int i, use_cq = 0;
1200
1201         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1202                 use_cq = 1;
1203
1204         for_each_output_queue(irq_ptr, q, i) {
1205                 if (use_cq) {
1206                         if (multicast_outbound(q))
1207                                 continue;
1208                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1209                                 use_cq = 0;
1210                                 continue;
1211                         }
1212                 } else
1213                         qdio_disable_async_operation(&q->u.out);
1214         }
1215         DBF_EVENT("use_cq:%d", use_cq);
1216 }
1217
1218 static void qdio_trace_init_data(struct qdio_irq *irq,
1219                                  struct qdio_initialize *data)
1220 {
1221         DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
1222         DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
1223         DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
1224         DBF_DEV_HEX(irq, &data->input_slib_elements, sizeof(void *), DBF_ERR);
1225         DBF_DEV_HEX(irq, &data->output_slib_elements, sizeof(void *), DBF_ERR);
1226         DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
1227                       data->no_output_qs);
1228         DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
1229         DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
1230         DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
1231         DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
1232         DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
1233                     DBF_ERR);
1234 }
1235
1236 /**
1237  * qdio_establish - establish queues on a qdio subchannel
1238  * @cdev: associated ccw device
1239  * @init_data: initialization data
1240  */
1241 int qdio_establish(struct ccw_device *cdev,
1242                    struct qdio_initialize *init_data)
1243 {
1244         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1245         struct subchannel_id schid;
1246         int rc;
1247
1248         ccw_device_get_schid(cdev, &schid);
1249         DBF_EVENT("qestablish:%4x", schid.sch_no);
1250
1251         if (!irq_ptr)
1252                 return -ENODEV;
1253
1254         if (init_data->no_input_qs > irq_ptr->max_input_qs ||
1255             init_data->no_output_qs > irq_ptr->max_output_qs)
1256                 return -EINVAL;
1257
1258         if ((init_data->no_input_qs && !init_data->input_handler) ||
1259             (init_data->no_output_qs && !init_data->output_handler))
1260                 return -EINVAL;
1261
1262         if (!init_data->input_sbal_addr_array ||
1263             !init_data->output_sbal_addr_array)
1264                 return -EINVAL;
1265
1266         mutex_lock(&irq_ptr->setup_mutex);
1267         qdio_trace_init_data(irq_ptr, init_data);
1268         qdio_setup_irq(irq_ptr, init_data);
1269
1270         rc = qdio_establish_thinint(irq_ptr);
1271         if (rc) {
1272                 qdio_shutdown_irq(irq_ptr);
1273                 mutex_unlock(&irq_ptr->setup_mutex);
1274                 return rc;
1275         }
1276
1277         /* establish q */
1278         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1279         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1280         irq_ptr->ccw.count = irq_ptr->equeue.count;
1281         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1282
1283         spin_lock_irq(get_ccwdev_lock(cdev));
1284         ccw_device_set_options_mask(cdev, 0);
1285
1286         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1287         spin_unlock_irq(get_ccwdev_lock(cdev));
1288         if (rc) {
1289                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1290                 DBF_ERROR("rc:%4x", rc);
1291                 qdio_shutdown_thinint(irq_ptr);
1292                 qdio_shutdown_irq(irq_ptr);
1293                 mutex_unlock(&irq_ptr->setup_mutex);
1294                 return rc;
1295         }
1296
1297         wait_event_interruptible_timeout(cdev->private->wait_q,
1298                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1299                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1300
1301         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1302                 mutex_unlock(&irq_ptr->setup_mutex);
1303                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1304                 return -EIO;
1305         }
1306
1307         qdio_setup_ssqd_info(irq_ptr);
1308
1309         qdio_detect_hsicq(irq_ptr);
1310
1311         /* qebsm is now setup if available, initialize buffer states */
1312         qdio_init_buf_states(irq_ptr);
1313
1314         mutex_unlock(&irq_ptr->setup_mutex);
1315         qdio_print_subchannel_info(irq_ptr);
1316         qdio_setup_debug_entries(irq_ptr);
1317         return 0;
1318 }
1319 EXPORT_SYMBOL_GPL(qdio_establish);
1320
1321 /**
1322  * qdio_activate - activate queues on a qdio subchannel
1323  * @cdev: associated cdev
1324  */
1325 int qdio_activate(struct ccw_device *cdev)
1326 {
1327         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1328         struct subchannel_id schid;
1329         int rc;
1330
1331         ccw_device_get_schid(cdev, &schid);
1332         DBF_EVENT("qactivate:%4x", schid.sch_no);
1333
1334         if (!irq_ptr)
1335                 return -ENODEV;
1336
1337         mutex_lock(&irq_ptr->setup_mutex);
1338         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1339                 rc = -EBUSY;
1340                 goto out;
1341         }
1342
1343         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1344         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1345         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1346         irq_ptr->ccw.cda = 0;
1347
1348         spin_lock_irq(get_ccwdev_lock(cdev));
1349         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1350
1351         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1352                               0, DOIO_DENY_PREFETCH);
1353         spin_unlock_irq(get_ccwdev_lock(cdev));
1354         if (rc) {
1355                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1356                 DBF_ERROR("rc:%4x", rc);
1357                 goto out;
1358         }
1359
1360         if (is_thinint_irq(irq_ptr))
1361                 tiqdio_add_device(irq_ptr);
1362
1363         /* wait for subchannel to become active */
1364         msleep(5);
1365
1366         switch (irq_ptr->state) {
1367         case QDIO_IRQ_STATE_STOPPED:
1368         case QDIO_IRQ_STATE_ERR:
1369                 rc = -EIO;
1370                 break;
1371         default:
1372                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1373                 rc = 0;
1374         }
1375 out:
1376         mutex_unlock(&irq_ptr->setup_mutex);
1377         return rc;
1378 }
1379 EXPORT_SYMBOL_GPL(qdio_activate);
1380
1381 /**
1382  * handle_inbound - reset processed input buffers
1383  * @q: queue containing the buffers
1384  * @callflags: flags
1385  * @bufnr: first buffer to process
1386  * @count: how many buffers are emptied
1387  */
1388 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1389                           int bufnr, int count)
1390 {
1391         int overlap;
1392
1393         qperf_inc(q, inbound_call);
1394
1395         /* If any processed SBALs are returned to HW, adjust our tracking: */
1396         overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
1397                              q->u.in.batch_count);
1398         if (overlap > 0) {
1399                 q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
1400                 q->u.in.batch_count -= overlap;
1401         }
1402
1403         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1404         atomic_add(count, &q->nr_buf_used);
1405
1406         if (need_siga_in(q))
1407                 return qdio_siga_input(q);
1408
1409         return 0;
1410 }
1411
1412 /**
1413  * handle_outbound - process filled outbound buffers
1414  * @q: queue containing the buffers
1415  * @callflags: flags
1416  * @bufnr: first buffer to process
1417  * @count: how many buffers are filled
1418  */
1419 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1420                            unsigned int bufnr, unsigned int count)
1421 {
1422         const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
1423         unsigned char state = 0;
1424         int used, rc = 0;
1425
1426         qperf_inc(q, outbound_call);
1427
1428         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1429         used = atomic_add_return(count, &q->nr_buf_used);
1430
1431         if (used == QDIO_MAX_BUFFERS_PER_Q)
1432                 qperf_inc(q, outbound_queue_full);
1433
1434         if (callflags & QDIO_FLAG_PCI_OUT) {
1435                 q->u.out.pci_out_enabled = 1;
1436                 qperf_inc(q, pci_request_int);
1437         } else
1438                 q->u.out.pci_out_enabled = 0;
1439
1440         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1441                 unsigned long phys_aob = 0;
1442
1443                 if (q->u.out.use_cq && count == 1)
1444                         phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1445
1446                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1447         } else if (need_siga_sync(q)) {
1448                 rc = qdio_siga_sync_q(q);
1449         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1450                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1451                    state == SLSB_CU_OUTPUT_PRIMED) {
1452                 /* The previous buffer is not processed yet, tack on. */
1453                 qperf_inc(q, fast_requeue);
1454         } else {
1455                 rc = qdio_kick_outbound_q(q, count, 0);
1456         }
1457
1458         /* Let drivers implement their own completion scanning: */
1459         if (!scan_threshold)
1460                 return rc;
1461
1462         /* in case of SIGA errors we must process the error immediately */
1463         if (used >= scan_threshold || rc)
1464                 qdio_tasklet_schedule(q);
1465         else
1466                 /* free the SBALs in case of no further traffic */
1467                 if (!timer_pending(&q->u.out.timer) &&
1468                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1469                         mod_timer(&q->u.out.timer, jiffies + HZ);
1470         return rc;
1471 }
1472
1473 /**
1474  * do_QDIO - process input or output buffers
1475  * @cdev: associated ccw_device for the qdio subchannel
1476  * @callflags: input or output and special flags from the program
1477  * @q_nr: queue number
1478  * @bufnr: buffer number
1479  * @count: how many buffers to process
1480  */
1481 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1482             int q_nr, unsigned int bufnr, unsigned int count)
1483 {
1484         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1485
1486         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1487                 return -EINVAL;
1488
1489         if (!irq_ptr)
1490                 return -ENODEV;
1491
1492         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1493                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1494
1495         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1496                 return -EIO;
1497         if (!count)
1498                 return 0;
1499         if (callflags & QDIO_FLAG_SYNC_INPUT)
1500                 return handle_inbound(irq_ptr->input_qs[q_nr],
1501                                       callflags, bufnr, count);
1502         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1503                 return handle_outbound(irq_ptr->output_qs[q_nr],
1504                                        callflags, bufnr, count);
1505         return -EINVAL;
1506 }
1507 EXPORT_SYMBOL_GPL(do_QDIO);
1508
1509 /**
1510  * qdio_start_irq - enable interrupt processing for the device
1511  * @cdev: associated ccw_device for the qdio subchannel
1512  *
1513  * Return codes
1514  *   0 - success
1515  *   1 - irqs not started since new data is available
1516  */
1517 int qdio_start_irq(struct ccw_device *cdev)
1518 {
1519         struct qdio_q *q;
1520         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1521         unsigned int i;
1522
1523         if (!irq_ptr)
1524                 return -ENODEV;
1525
1526         for_each_input_queue(irq_ptr, q, i)
1527                 qdio_stop_polling(q);
1528
1529         clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
1530
1531         /*
1532          * We need to check again to not lose initiative after
1533          * resetting the ACK state.
1534          */
1535         if (test_nonshared_ind(irq_ptr))
1536                 goto rescan;
1537
1538         for_each_input_queue(irq_ptr, q, i) {
1539                 if (!qdio_inbound_q_done(q, q->first_to_check))
1540                         goto rescan;
1541         }
1542
1543         return 0;
1544
1545 rescan:
1546         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1547                 return 0;
1548         else
1549                 return 1;
1550
1551 }
1552 EXPORT_SYMBOL(qdio_start_irq);
1553
1554 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
1555                                 unsigned int *error)
1556 {
1557         unsigned int start = q->first_to_check;
1558         int count;
1559
1560         count = q->is_input_q ? qdio_inbound_q_moved(q, start) :
1561                                 qdio_outbound_q_moved(q, start);
1562         if (count == 0)
1563                 return 0;
1564
1565         *bufnr = start;
1566         *error = q->qdio_error;
1567
1568         /* for the next time */
1569         q->first_to_check = add_buf(start, count);
1570         q->qdio_error = 0;
1571
1572         return count;
1573 }
1574
1575 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
1576                        unsigned int *bufnr, unsigned int *error)
1577 {
1578         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1579         struct qdio_q *q;
1580
1581         if (!irq_ptr)
1582                 return -ENODEV;
1583         q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
1584
1585         if (need_siga_sync(q))
1586                 qdio_siga_sync_q(q);
1587
1588         return __qdio_inspect_queue(q, bufnr, error);
1589 }
1590 EXPORT_SYMBOL_GPL(qdio_inspect_queue);
1591
1592 /**
1593  * qdio_get_next_buffers - process input buffers
1594  * @cdev: associated ccw_device for the qdio subchannel
1595  * @nr: input queue number
1596  * @bufnr: first filled buffer number
1597  * @error: buffers are in error state
1598  *
1599  * Return codes
1600  *   < 0 - error
1601  *   = 0 - no new buffers found
1602  *   > 0 - number of processed buffers
1603  */
1604 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1605                           int *error)
1606 {
1607         struct qdio_q *q;
1608         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1609
1610         if (!irq_ptr)
1611                 return -ENODEV;
1612         q = irq_ptr->input_qs[nr];
1613
1614         /*
1615          * Cannot rely on automatic sync after interrupt since queues may
1616          * also be examined without interrupt.
1617          */
1618         if (need_siga_sync(q))
1619                 qdio_sync_queues(q);
1620
1621         qdio_check_outbound_pci_queues(irq_ptr);
1622
1623         /* Note: upper-layer MUST stop processing immediately here ... */
1624         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1625                 return -EIO;
1626
1627         return __qdio_inspect_queue(q, bufnr, error);
1628 }
1629 EXPORT_SYMBOL(qdio_get_next_buffers);
1630
1631 /**
1632  * qdio_stop_irq - disable interrupt processing for the device
1633  * @cdev: associated ccw_device for the qdio subchannel
1634  *
1635  * Return codes
1636  *   0 - interrupts were already disabled
1637  *   1 - interrupts successfully disabled
1638  */
1639 int qdio_stop_irq(struct ccw_device *cdev)
1640 {
1641         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1642
1643         if (!irq_ptr)
1644                 return -ENODEV;
1645
1646         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1647                 return 0;
1648         else
1649                 return 1;
1650 }
1651 EXPORT_SYMBOL(qdio_stop_irq);
1652
1653 static int __init init_QDIO(void)
1654 {
1655         int rc;
1656
1657         rc = qdio_debug_init();
1658         if (rc)
1659                 return rc;
1660         rc = qdio_setup_init();
1661         if (rc)
1662                 goto out_debug;
1663         rc = qdio_thinint_init();
1664         if (rc)
1665                 goto out_cache;
1666         return 0;
1667
1668 out_cache:
1669         qdio_setup_exit();
1670 out_debug:
1671         qdio_debug_exit();
1672         return rc;
1673 }
1674
1675 static void __exit exit_QDIO(void)
1676 {
1677         qdio_thinint_exit();
1678         qdio_setup_exit();
1679         qdio_debug_exit();
1680 }
1681
1682 module_init(init_QDIO);
1683 module_exit(exit_QDIO);