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 inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 512 {
 513         unsigned char state = 0;
 514
 515         if (!atomic_read(&q->nr_buf_used))
 516                 return 1;
 517
 518         if (need_siga_sync(q))
 519                 qdio_siga_sync_q(q);
 520         get_buf_state(q, start, &state, 0);
 521
 522         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 523                 /* more work coming */
 524                 return 0;
 525
 526         return 1;
 527 }
 528
 529 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 530                                         int bufnr)
 531 {
 532         unsigned long phys_aob = 0;
 533
 534         if (!q->aobs[bufnr]) {
 535                 struct qaob *aob = qdio_allocate_aob();
 536                 q->aobs[bufnr] = aob;
 537         }
 538         if (q->aobs[bufnr]) {
 539                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 540                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 541                 WARN_ON_ONCE(phys_aob & 0xFF);
 542         }
 543
 544         q->sbal_state[bufnr].flags = 0;
 545         return phys_aob;
 546 }
 547
 548 static void qdio_kick_handler(struct qdio_q *q, unsigned int start,
 549                               unsigned int count)
 550 {
 551         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 552                 return;
 553
 554         if (q->is_input_q) {
 555                 qperf_inc(q, inbound_handler);
 556                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 557         } else {
 558                 qperf_inc(q, outbound_handler);
 559                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 560                               start, count);
 561         }
 562
 563         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 564                    q->irq_ptr->int_parm);
 565
 566         /* for the next time */
 567         q->qdio_error = 0;
 568 }
 569
 570 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 571 {
 572         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 573                 tasklet_schedule(&q->u.out.tasklet);
 574                 return 0;
 575         }
 576         return -EPERM;
 577 }
 578
 579 static void qdio_check_pending(struct qdio_q *q, unsigned int index)
 580 {
 581         unsigned char state;
 582
 583         if (get_buf_state(q, index, &state, 0) > 0 &&
 584             state == SLSB_P_OUTPUT_PENDING &&
 585             q->u.out.aobs[index]) {
 586                 q->u.out.sbal_state[index].flags |=
 587                         QDIO_OUTBUF_STATE_FLAG_PENDING;
 588                 q->u.out.aobs[index] = NULL;
 589         }
 590 }
 591
 592 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 593 {
 594         unsigned char state = 0;
 595         int count;
 596
 597         q->timestamp = get_tod_clock_fast();
 598
 599         if (need_siga_sync(q))
 600                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 601                     !pci_out_supported(q->irq_ptr)) ||
 602                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 603                     multicast_outbound(q)))
 604                         qdio_siga_sync_q(q);
 605
 606         count = atomic_read(&q->nr_buf_used);
 607         if (!count)
 608                 return 0;
 609
 610         count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
 611         if (!count)
 612                 return 0;
 613
 614         switch (state) {
 615         case SLSB_P_OUTPUT_EMPTY:
 616         case SLSB_P_OUTPUT_PENDING:
 617                 /* the adapter got it */
 618                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 619                         "out empty:%1d %02x", q->nr, count);
 620
 621                 atomic_sub(count, &q->nr_buf_used);
 622                 if (q->irq_ptr->perf_stat_enabled)
 623                         account_sbals(q, count);
 624                 return count;
 625         case SLSB_P_OUTPUT_ERROR:
 626                 process_buffer_error(q, start, count);
 627                 atomic_sub(count, &q->nr_buf_used);
 628                 if (q->irq_ptr->perf_stat_enabled)
 629                         account_sbals_error(q, count);
 630                 return count;
 631         case SLSB_CU_OUTPUT_PRIMED:
 632                 /* the adapter has not fetched the output yet */
 633                 if (q->irq_ptr->perf_stat_enabled)
 634                         q->q_stats.nr_sbal_nop++;
 635                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 636                               q->nr);
 637                 return 0;
 638         case SLSB_P_OUTPUT_HALTED:
 639                 return 0;
 640         case SLSB_P_OUTPUT_NOT_INIT:
 641                 /* We should never see this state, throw a WARN: */
 642         default:
 643                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 644                               "found state %#x at index %u on queue %u\n",
 645                               state, start, q->nr);
 646                 return 0;
 647         }
 648 }
 649
 650 /* all buffers processed? */
 651 static inline int qdio_outbound_q_done(struct qdio_q *q)
 652 {
 653         return atomic_read(&q->nr_buf_used) == 0;
 654 }
 655
 656 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
 657 {
 658         int count;
 659
 660         count = get_outbound_buffer_frontier(q, start);
 661
 662         if (count) {
 663                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 664
 665                 if (q->u.out.use_cq) {
 666                         unsigned int i;
 667
 668                         for (i = 0; i < count; i++)
 669                                 qdio_check_pending(q, QDIO_BUFNR(start + i));
 670                 }
 671         }
 672
 673         return count;
 674 }
 675
 676 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 677                                 unsigned long aob)
 678 {
 679         int retries = 0, cc;
 680         unsigned int busy_bit;
 681
 682         if (!need_siga_out(q))
 683                 return 0;
 684
 685         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 686 retry:
 687         qperf_inc(q, siga_write);
 688
 689         cc = qdio_siga_output(q, count, &busy_bit, aob);
 690         switch (cc) {
 691         case 0:
 692                 break;
 693         case 2:
 694                 if (busy_bit) {
 695                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 696                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 697                                 goto retry;
 698                         }
 699                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 700                         cc = -EBUSY;
 701                 } else {
 702                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 703                         cc = -ENOBUFS;
 704                 }
 705                 break;
 706         case 1:
 707         case 3:
 708                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 709                 cc = -EIO;
 710                 break;
 711         }
 712         if (retries) {
 713                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 714                 DBF_ERROR("count:%u", retries);
 715         }
 716         return cc;
 717 }
 718
 719 void qdio_outbound_tasklet(struct tasklet_struct *t)
 720 {
 721         struct qdio_output_q *out_q = from_tasklet(out_q, t, tasklet);
 722         struct qdio_q *q = container_of(out_q, struct qdio_q, u.out);
 723         unsigned int start = q->first_to_check;
 724         int count;
 725
 726         qperf_inc(q, tasklet_outbound);
 727         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 728
 729         count = qdio_outbound_q_moved(q, start);
 730         if (count) {
 731                 q->first_to_check = add_buf(start, count);
 732                 qdio_kick_handler(q, start, count);
 733         }
 734
 735         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 736             !qdio_outbound_q_done(q))
 737                 goto sched;
 738
 739         if (q->u.out.pci_out_enabled)
 740                 return;
 741
 742         /*
 743          * Now we know that queue type is either qeth without pci enabled
 744          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 745          * is noticed and outbound_handler is called after some time.
 746          */
 747         if (qdio_outbound_q_done(q))
 748                 del_timer_sync(&q->u.out.timer);
 749         else
 750                 if (!timer_pending(&q->u.out.timer) &&
 751                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 752                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 753         return;
 754
 755 sched:
 756         qdio_tasklet_schedule(q);
 757 }
 758
 759 void qdio_outbound_timer(struct timer_list *t)
 760 {
 761         struct qdio_q *q = from_timer(q, t, u.out.timer);
 762
 763         qdio_tasklet_schedule(q);
 764 }
 765
 766 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 767 {
 768         struct qdio_q *out;
 769         int i;
 770
 771         if (!pci_out_supported(irq) || !irq->scan_threshold)
 772                 return;
 773
 774         for_each_output_queue(irq, out, i)
 775                 if (!qdio_outbound_q_done(out))
 776                         qdio_tasklet_schedule(out);
 777 }
 778
 779 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 780                                   enum qdio_irq_states state)
 781 {
 782         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 783
 784         irq_ptr->state = state;
 785         mb();
 786 }
 787
 788 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 789 {
 790         if (irb->esw.esw0.erw.cons) {
 791                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 792                 DBF_ERROR_HEX(irb, 64);
 793                 DBF_ERROR_HEX(irb->ecw, 64);
 794         }
 795 }
 796
 797 /* PCI interrupt handler */
 798 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 799 {
 800         int i;
 801         struct qdio_q *q;
 802
 803         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 804                 return;
 805
 806         qdio_deliver_irq(irq_ptr);
 807         irq_ptr->last_data_irq_time = S390_lowcore.int_clock;
 808
 809         if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold)
 810                 return;
 811
 812         for_each_output_queue(irq_ptr, q, i) {
 813                 if (qdio_outbound_q_done(q))
 814                         continue;
 815                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 816                         qdio_siga_sync_q(q);
 817                 qdio_tasklet_schedule(q);
 818         }
 819 }
 820
 821 static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
 822                                        unsigned long intparm, int cstat,
 823                                        int dstat)
 824 {
 825         struct qdio_q *q;
 826
 827         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 828         DBF_ERROR("intp :%lx", intparm);
 829         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 830
 831         if (irq_ptr->nr_input_qs) {
 832                 q = irq_ptr->input_qs[0];
 833         } else if (irq_ptr->nr_output_qs) {
 834                 q = irq_ptr->output_qs[0];
 835         } else {
 836                 dump_stack();
 837                 goto no_handler;
 838         }
 839
 840         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
 841                    q->nr, q->first_to_check, 0, irq_ptr->int_parm);
 842 no_handler:
 843         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 844         /*
 845          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
 846          * Therefore we call the LGR detection function here.
 847          */
 848         lgr_info_log();
 849 }
 850
 851 static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat,
 852                                       int dstat)
 853 {
 854         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 855
 856         if (cstat)
 857                 goto error;
 858         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 859                 goto error;
 860         if (!(dstat & DEV_STAT_DEV_END))
 861                 goto error;
 862         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 863         return;
 864
 865 error:
 866         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 867         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 868         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 869 }
 870
 871 /* qdio interrupt handler */
 872 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 873                       struct irb *irb)
 874 {
 875         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 876         struct subchannel_id schid;
 877         int cstat, dstat;
 878
 879         if (!intparm || !irq_ptr) {
 880                 ccw_device_get_schid(cdev, &schid);
 881                 DBF_ERROR("qint:%4x", schid.sch_no);
 882                 return;
 883         }
 884
 885         if (irq_ptr->perf_stat_enabled)
 886                 irq_ptr->perf_stat.qdio_int++;
 887
 888         if (IS_ERR(irb)) {
 889                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 890                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 891                 wake_up(&cdev->private->wait_q);
 892                 return;
 893         }
 894         qdio_irq_check_sense(irq_ptr, irb);
 895         cstat = irb->scsw.cmd.cstat;
 896         dstat = irb->scsw.cmd.dstat;
 897
 898         switch (irq_ptr->state) {
 899         case QDIO_IRQ_STATE_INACTIVE:
 900                 qdio_establish_handle_irq(irq_ptr, cstat, dstat);
 901                 break;
 902         case QDIO_IRQ_STATE_CLEANUP:
 903                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 904                 break;
 905         case QDIO_IRQ_STATE_ESTABLISHED:
 906         case QDIO_IRQ_STATE_ACTIVE:
 907                 if (cstat & SCHN_STAT_PCI) {
 908                         qdio_int_handler_pci(irq_ptr);
 909                         return;
 910                 }
 911                 if (cstat || dstat)
 912                         qdio_handle_activate_check(irq_ptr, intparm, cstat,
 913                                                    dstat);
 914                 break;
 915         case QDIO_IRQ_STATE_STOPPED:
 916                 break;
 917         default:
 918                 WARN_ON_ONCE(1);
 919         }
 920         wake_up(&cdev->private->wait_q);
 921 }
 922
 923 /**
 924  * qdio_get_ssqd_desc - get qdio subchannel description
 925  * @cdev: ccw device to get description for
 926  * @data: where to store the ssqd
 927  *
 928  * Returns 0 or an error code. The results of the chsc are stored in the
 929  * specified structure.
 930  */
 931 int qdio_get_ssqd_desc(struct ccw_device *cdev,
 932                        struct qdio_ssqd_desc *data)
 933 {
 934         struct subchannel_id schid;
 935
 936         if (!cdev || !cdev->private)
 937                 return -EINVAL;
 938
 939         ccw_device_get_schid(cdev, &schid);
 940         DBF_EVENT("get ssqd:%4x", schid.sch_no);
 941         return qdio_setup_get_ssqd(NULL, &schid, data);
 942 }
 943 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
 944
 945 static void qdio_shutdown_queues(struct qdio_irq *irq_ptr)
 946 {
 947         struct qdio_q *q;
 948         int i;
 949
 950         for_each_output_queue(irq_ptr, q, i) {
 951                 del_timer_sync(&q->u.out.timer);
 952                 tasklet_kill(&q->u.out.tasklet);
 953         }
 954 }
 955
 956 /**
 957  * qdio_shutdown - shut down a qdio subchannel
 958  * @cdev: associated ccw device
 959  * @how: use halt or clear to shutdown
 960  */
 961 int qdio_shutdown(struct ccw_device *cdev, int how)
 962 {
 963         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 964         struct subchannel_id schid;
 965         int rc;
 966
 967         if (!irq_ptr)
 968                 return -ENODEV;
 969
 970         WARN_ON_ONCE(irqs_disabled());
 971         ccw_device_get_schid(cdev, &schid);
 972         DBF_EVENT("qshutdown:%4x", schid.sch_no);
 973
 974         mutex_lock(&irq_ptr->setup_mutex);
 975         /*
 976          * Subchannel was already shot down. We cannot prevent being called
 977          * twice since cio may trigger a shutdown asynchronously.
 978          */
 979         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
 980                 mutex_unlock(&irq_ptr->setup_mutex);
 981                 return 0;
 982         }
 983
 984         /*
 985          * Indicate that the device is going down. Scheduling the queue
 986          * tasklets is forbidden from here on.
 987          */
 988         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 989
 990         qdio_shutdown_queues(irq_ptr);
 991         qdio_shutdown_debug_entries(irq_ptr);
 992
 993         /* cleanup subchannel */
 994         spin_lock_irq(get_ccwdev_lock(cdev));
 995         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
 996         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
 997                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
 998         else
 999                 /* default behaviour is halt */
1000                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1001         spin_unlock_irq(get_ccwdev_lock(cdev));
1002         if (rc) {
1003                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1004                 DBF_ERROR("rc:%4d", rc);
1005                 goto no_cleanup;
1006         }
1007
1008         wait_event_interruptible_timeout(cdev->private->wait_q,
1009                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1010                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1011                 10 * HZ);
1012
1013 no_cleanup:
1014         qdio_shutdown_thinint(irq_ptr);
1015         qdio_shutdown_irq(irq_ptr);
1016
1017         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1018         mutex_unlock(&irq_ptr->setup_mutex);
1019         if (rc)
1020                 return rc;
1021         return 0;
1022 }
1023 EXPORT_SYMBOL_GPL(qdio_shutdown);
1024
1025 /**
1026  * qdio_free - free data structures for a qdio subchannel
1027  * @cdev: associated ccw device
1028  */
1029 int qdio_free(struct ccw_device *cdev)
1030 {
1031         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1032         struct subchannel_id schid;
1033
1034         if (!irq_ptr)
1035                 return -ENODEV;
1036
1037         ccw_device_get_schid(cdev, &schid);
1038         DBF_EVENT("qfree:%4x", schid.sch_no);
1039         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1040         mutex_lock(&irq_ptr->setup_mutex);
1041
1042         irq_ptr->debug_area = NULL;
1043         cdev->private->qdio_data = NULL;
1044         mutex_unlock(&irq_ptr->setup_mutex);
1045
1046         qdio_free_async_data(irq_ptr);
1047         qdio_free_queues(irq_ptr);
1048         free_page((unsigned long) irq_ptr->qdr);
1049         free_page(irq_ptr->chsc_page);
1050         free_page((unsigned long) irq_ptr);
1051         return 0;
1052 }
1053 EXPORT_SYMBOL_GPL(qdio_free);
1054
1055 /**
1056  * qdio_allocate - allocate qdio queues and associated data
1057  * @cdev: associated ccw device
1058  * @no_input_qs: allocate this number of Input Queues
1059  * @no_output_qs: allocate this number of Output Queues
1060  */
1061 int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
1062                   unsigned int no_output_qs)
1063 {
1064         struct subchannel_id schid;
1065         struct qdio_irq *irq_ptr;
1066         int rc = -ENOMEM;
1067
1068         ccw_device_get_schid(cdev, &schid);
1069         DBF_EVENT("qallocate:%4x", schid.sch_no);
1070
1071         if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
1072             no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
1073                 return -EINVAL;
1074
1075         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1076         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1077         if (!irq_ptr)
1078                 return -ENOMEM;
1079
1080         irq_ptr->cdev = cdev;
1081         mutex_init(&irq_ptr->setup_mutex);
1082         if (qdio_allocate_dbf(irq_ptr))
1083                 goto err_dbf;
1084
1085         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
1086                       no_output_qs);
1087
1088         /*
1089          * Allocate a page for the chsc calls in qdio_establish.
1090          * Must be pre-allocated since a zfcp recovery will call
1091          * qdio_establish. In case of low memory and swap on a zfcp disk
1092          * we may not be able to allocate memory otherwise.
1093          */
1094         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1095         if (!irq_ptr->chsc_page)
1096                 goto err_chsc;
1097
1098         /* qdr is used in ccw1.cda which is u32 */
1099         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1100         if (!irq_ptr->qdr)
1101                 goto err_qdr;
1102
1103         rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
1104         if (rc)
1105                 goto err_queues;
1106
1107         cdev->private->qdio_data = irq_ptr;
1108         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1109         return 0;
1110
1111 err_queues:
1112         free_page((unsigned long) irq_ptr->qdr);
1113 err_qdr:
1114         free_page(irq_ptr->chsc_page);
1115 err_chsc:
1116 err_dbf:
1117         free_page((unsigned long) irq_ptr);
1118         return rc;
1119 }
1120 EXPORT_SYMBOL_GPL(qdio_allocate);
1121
1122 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1123 {
1124         struct qdio_q *q = irq_ptr->input_qs[0];
1125         int i, use_cq = 0;
1126
1127         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1128                 use_cq = 1;
1129
1130         for_each_output_queue(irq_ptr, q, i) {
1131                 if (use_cq) {
1132                         if (multicast_outbound(q))
1133                                 continue;
1134                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1135                                 use_cq = 0;
1136                                 continue;
1137                         }
1138                 } else
1139                         qdio_disable_async_operation(&q->u.out);
1140         }
1141         DBF_EVENT("use_cq:%d", use_cq);
1142 }
1143
1144 static void qdio_trace_init_data(struct qdio_irq *irq,
1145                                  struct qdio_initialize *data)
1146 {
1147         DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
1148         DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
1149         DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
1150         DBF_DEV_HEX(irq, &data->input_slib_elements, sizeof(void *), DBF_ERR);
1151         DBF_DEV_HEX(irq, &data->output_slib_elements, sizeof(void *), DBF_ERR);
1152         DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
1153                       data->no_output_qs);
1154         DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
1155         DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
1156         DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
1157         DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
1158         DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
1159                     DBF_ERR);
1160 }
1161
1162 /**
1163  * qdio_establish - establish queues on a qdio subchannel
1164  * @cdev: associated ccw device
1165  * @init_data: initialization data
1166  */
1167 int qdio_establish(struct ccw_device *cdev,
1168                    struct qdio_initialize *init_data)
1169 {
1170         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1171         struct subchannel_id schid;
1172         int rc;
1173
1174         ccw_device_get_schid(cdev, &schid);
1175         DBF_EVENT("qestablish:%4x", schid.sch_no);
1176
1177         if (!irq_ptr)
1178                 return -ENODEV;
1179
1180         if (init_data->no_input_qs > irq_ptr->max_input_qs ||
1181             init_data->no_output_qs > irq_ptr->max_output_qs)
1182                 return -EINVAL;
1183
1184         if ((init_data->no_input_qs && !init_data->input_handler) ||
1185             (init_data->no_output_qs && !init_data->output_handler))
1186                 return -EINVAL;
1187
1188         if (!init_data->input_sbal_addr_array ||
1189             !init_data->output_sbal_addr_array)
1190                 return -EINVAL;
1191
1192         if (!init_data->irq_poll)
1193                 return -EINVAL;
1194
1195         mutex_lock(&irq_ptr->setup_mutex);
1196         qdio_trace_init_data(irq_ptr, init_data);
1197         qdio_setup_irq(irq_ptr, init_data);
1198
1199         rc = qdio_establish_thinint(irq_ptr);
1200         if (rc) {
1201                 qdio_shutdown_irq(irq_ptr);
1202                 mutex_unlock(&irq_ptr->setup_mutex);
1203                 return rc;
1204         }
1205
1206         /* establish q */
1207         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1208         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1209         irq_ptr->ccw.count = irq_ptr->equeue.count;
1210         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1211
1212         spin_lock_irq(get_ccwdev_lock(cdev));
1213         ccw_device_set_options_mask(cdev, 0);
1214
1215         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1216         spin_unlock_irq(get_ccwdev_lock(cdev));
1217         if (rc) {
1218                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1219                 DBF_ERROR("rc:%4x", rc);
1220                 qdio_shutdown_thinint(irq_ptr);
1221                 qdio_shutdown_irq(irq_ptr);
1222                 mutex_unlock(&irq_ptr->setup_mutex);
1223                 return rc;
1224         }
1225
1226         wait_event_interruptible_timeout(cdev->private->wait_q,
1227                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1228                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1229
1230         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1231                 mutex_unlock(&irq_ptr->setup_mutex);
1232                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1233                 return -EIO;
1234         }
1235
1236         qdio_setup_ssqd_info(irq_ptr);
1237
1238         qdio_detect_hsicq(irq_ptr);
1239
1240         /* qebsm is now setup if available, initialize buffer states */
1241         qdio_init_buf_states(irq_ptr);
1242
1243         mutex_unlock(&irq_ptr->setup_mutex);
1244         qdio_print_subchannel_info(irq_ptr);
1245         qdio_setup_debug_entries(irq_ptr);
1246         return 0;
1247 }
1248 EXPORT_SYMBOL_GPL(qdio_establish);
1249
1250 /**
1251  * qdio_activate - activate queues on a qdio subchannel
1252  * @cdev: associated cdev
1253  */
1254 int qdio_activate(struct ccw_device *cdev)
1255 {
1256         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1257         struct subchannel_id schid;
1258         int rc;
1259
1260         ccw_device_get_schid(cdev, &schid);
1261         DBF_EVENT("qactivate:%4x", schid.sch_no);
1262
1263         if (!irq_ptr)
1264                 return -ENODEV;
1265
1266         mutex_lock(&irq_ptr->setup_mutex);
1267         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1268                 rc = -EBUSY;
1269                 goto out;
1270         }
1271
1272         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1273         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1274         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1275         irq_ptr->ccw.cda = 0;
1276
1277         spin_lock_irq(get_ccwdev_lock(cdev));
1278         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1279
1280         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1281                               0, DOIO_DENY_PREFETCH);
1282         spin_unlock_irq(get_ccwdev_lock(cdev));
1283         if (rc) {
1284                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1285                 DBF_ERROR("rc:%4x", rc);
1286                 goto out;
1287         }
1288
1289         /* wait for subchannel to become active */
1290         msleep(5);
1291
1292         switch (irq_ptr->state) {
1293         case QDIO_IRQ_STATE_STOPPED:
1294         case QDIO_IRQ_STATE_ERR:
1295                 rc = -EIO;
1296                 break;
1297         default:
1298                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1299                 rc = 0;
1300         }
1301 out:
1302         mutex_unlock(&irq_ptr->setup_mutex);
1303         return rc;
1304 }
1305 EXPORT_SYMBOL_GPL(qdio_activate);
1306
1307 /**
1308  * handle_inbound - reset processed input buffers
1309  * @q: queue containing the buffers
1310  * @callflags: flags
1311  * @bufnr: first buffer to process
1312  * @count: how many buffers are emptied
1313  */
1314 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1315                           int bufnr, int count)
1316 {
1317         int overlap;
1318
1319         qperf_inc(q, inbound_call);
1320
1321         /* If any processed SBALs are returned to HW, adjust our tracking: */
1322         overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
1323                              q->u.in.batch_count);
1324         if (overlap > 0) {
1325                 q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
1326                 q->u.in.batch_count -= overlap;
1327         }
1328
1329         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1330         atomic_add(count, &q->nr_buf_used);
1331
1332         if (need_siga_in(q))
1333                 return qdio_siga_input(q);
1334
1335         return 0;
1336 }
1337
1338 /**
1339  * handle_outbound - process filled outbound buffers
1340  * @q: queue containing the buffers
1341  * @callflags: flags
1342  * @bufnr: first buffer to process
1343  * @count: how many buffers are filled
1344  */
1345 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1346                            unsigned int bufnr, unsigned int count)
1347 {
1348         const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
1349         unsigned char state = 0;
1350         int used, rc = 0;
1351
1352         qperf_inc(q, outbound_call);
1353
1354         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1355         used = atomic_add_return(count, &q->nr_buf_used);
1356
1357         if (used == QDIO_MAX_BUFFERS_PER_Q)
1358                 qperf_inc(q, outbound_queue_full);
1359
1360         if (callflags & QDIO_FLAG_PCI_OUT) {
1361                 q->u.out.pci_out_enabled = 1;
1362                 qperf_inc(q, pci_request_int);
1363         } else
1364                 q->u.out.pci_out_enabled = 0;
1365
1366         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1367                 unsigned long phys_aob = 0;
1368
1369                 if (q->u.out.use_cq && count == 1)
1370                         phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1371
1372                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1373         } else if (need_siga_sync(q)) {
1374                 rc = qdio_siga_sync_q(q);
1375         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1376                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1377                    state == SLSB_CU_OUTPUT_PRIMED) {
1378                 /* The previous buffer is not processed yet, tack on. */
1379                 qperf_inc(q, fast_requeue);
1380         } else {
1381                 rc = qdio_kick_outbound_q(q, count, 0);
1382         }
1383
1384         /* Let drivers implement their own completion scanning: */
1385         if (!scan_threshold)
1386                 return rc;
1387
1388         /* in case of SIGA errors we must process the error immediately */
1389         if (used >= scan_threshold || rc)
1390                 qdio_tasklet_schedule(q);
1391         else
1392                 /* free the SBALs in case of no further traffic */
1393                 if (!timer_pending(&q->u.out.timer) &&
1394                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1395                         mod_timer(&q->u.out.timer, jiffies + HZ);
1396         return rc;
1397 }
1398
1399 /**
1400  * do_QDIO - process input or output buffers
1401  * @cdev: associated ccw_device for the qdio subchannel
1402  * @callflags: input or output and special flags from the program
1403  * @q_nr: queue number
1404  * @bufnr: buffer number
1405  * @count: how many buffers to process
1406  */
1407 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1408             int q_nr, unsigned int bufnr, unsigned int count)
1409 {
1410         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1411
1412         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1413                 return -EINVAL;
1414
1415         if (!irq_ptr)
1416                 return -ENODEV;
1417
1418         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1419                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1420
1421         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1422                 return -EIO;
1423         if (!count)
1424                 return 0;
1425         if (callflags & QDIO_FLAG_SYNC_INPUT)
1426                 return handle_inbound(irq_ptr->input_qs[q_nr],
1427                                       callflags, bufnr, count);
1428         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1429                 return handle_outbound(irq_ptr->output_qs[q_nr],
1430                                        callflags, bufnr, count);
1431         return -EINVAL;
1432 }
1433 EXPORT_SYMBOL_GPL(do_QDIO);
1434
1435 /**
1436  * qdio_start_irq - enable interrupt processing for the device
1437  * @cdev: associated ccw_device for the qdio subchannel
1438  *
1439  * Return codes
1440  *   0 - success
1441  *   1 - irqs not started since new data is available
1442  */
1443 int qdio_start_irq(struct ccw_device *cdev)
1444 {
1445         struct qdio_q *q;
1446         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1447         unsigned int i;
1448
1449         if (!irq_ptr)
1450                 return -ENODEV;
1451
1452         for_each_input_queue(irq_ptr, q, i)
1453                 qdio_stop_polling(q);
1454
1455         clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
1456
1457         /*
1458          * We need to check again to not lose initiative after
1459          * resetting the ACK state.
1460          */
1461         if (test_nonshared_ind(irq_ptr))
1462                 goto rescan;
1463
1464         for_each_input_queue(irq_ptr, q, i) {
1465                 if (!qdio_inbound_q_done(q, q->first_to_check))
1466                         goto rescan;
1467         }
1468
1469         return 0;
1470
1471 rescan:
1472         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1473                 return 0;
1474         else
1475                 return 1;
1476
1477 }
1478 EXPORT_SYMBOL(qdio_start_irq);
1479
1480 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
1481                                 unsigned int *error)
1482 {
1483         unsigned int start = q->first_to_check;
1484         int count;
1485
1486         count = q->is_input_q ? get_inbound_buffer_frontier(q, start) :
1487                                 qdio_outbound_q_moved(q, start);
1488         if (count == 0)
1489                 return 0;
1490
1491         *bufnr = start;
1492         *error = q->qdio_error;
1493
1494         /* for the next time */
1495         q->first_to_check = add_buf(start, count);
1496         q->qdio_error = 0;
1497
1498         return count;
1499 }
1500
1501 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
1502                        unsigned int *bufnr, unsigned int *error)
1503 {
1504         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1505         struct qdio_q *q;
1506
1507         if (!irq_ptr)
1508                 return -ENODEV;
1509         q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
1510
1511         if (need_siga_sync(q))
1512                 qdio_siga_sync_q(q);
1513
1514         return __qdio_inspect_queue(q, bufnr, error);
1515 }
1516 EXPORT_SYMBOL_GPL(qdio_inspect_queue);
1517
1518 /**
1519  * qdio_get_next_buffers - process input buffers
1520  * @cdev: associated ccw_device for the qdio subchannel
1521  * @nr: input queue number
1522  * @bufnr: first filled buffer number
1523  * @error: buffers are in error state
1524  *
1525  * Return codes
1526  *   < 0 - error
1527  *   = 0 - no new buffers found
1528  *   > 0 - number of processed buffers
1529  */
1530 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1531                           int *error)
1532 {
1533         struct qdio_q *q;
1534         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1535
1536         if (!irq_ptr)
1537                 return -ENODEV;
1538         q = irq_ptr->input_qs[nr];
1539
1540         /*
1541          * Cannot rely on automatic sync after interrupt since queues may
1542          * also be examined without interrupt.
1543          */
1544         if (need_siga_sync(q))
1545                 qdio_sync_queues(q);
1546
1547         qdio_check_outbound_pci_queues(irq_ptr);
1548
1549         /* Note: upper-layer MUST stop processing immediately here ... */
1550         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1551                 return -EIO;
1552
1553         return __qdio_inspect_queue(q, bufnr, error);
1554 }
1555 EXPORT_SYMBOL(qdio_get_next_buffers);
1556
1557 /**
1558  * qdio_stop_irq - disable interrupt processing for the device
1559  * @cdev: associated ccw_device for the qdio subchannel
1560  *
1561  * Return codes
1562  *   0 - interrupts were already disabled
1563  *   1 - interrupts successfully disabled
1564  */
1565 int qdio_stop_irq(struct ccw_device *cdev)
1566 {
1567         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1568
1569         if (!irq_ptr)
1570                 return -ENODEV;
1571
1572         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1573                 return 0;
1574         else
1575                 return 1;
1576 }
1577 EXPORT_SYMBOL(qdio_stop_irq);
1578
1579 static int __init init_QDIO(void)
1580 {
1581         int rc;
1582
1583         rc = qdio_debug_init();
1584         if (rc)
1585                 return rc;
1586         rc = qdio_setup_init();
1587         if (rc)
1588                 goto out_debug;
1589         rc = qdio_thinint_init();
1590         if (rc)
1591                 goto out_cache;
1592         return 0;
1593
1594 out_cache:
1595         qdio_setup_exit();
1596 out_debug:
1597         qdio_debug_exit();
1598         return rc;
1599 }
1600
1601 static void __exit exit_QDIO(void)
1602 {
1603         qdio_thinint_exit();
1604         qdio_setup_exit();
1605         qdio_debug_exit();
1606 }
1607
1608 module_init(init_QDIO);
1609 module_exit(exit_QDIO);