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         int pos;
 417
 418         q->q_stats.nr_sbal_total += count;
 419         if (count == QDIO_MAX_BUFFERS_MASK) {
 420                 q->q_stats.nr_sbals[7]++;
 421                 return;
 422         }
 423         pos = ilog2(count);
 424         q->q_stats.nr_sbals[pos]++;
 425 }
 426
 427 static void process_buffer_error(struct qdio_q *q, unsigned int start,
 428                                  int count)
 429 {
 430         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 431
 432         /* special handling for no target buffer empty */
 433         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 434             q->sbal[start]->element[15].sflags == 0x10) {
 435                 qperf_inc(q, target_full);
 436                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
 437                 return;
 438         }
 439
 440         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 441         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 442         DBF_ERROR("FTC:%3d C:%3d", start, count);
 443         DBF_ERROR("F14:%2x F15:%2x",
 444                   q->sbal[start]->element[14].sflags,
 445                   q->sbal[start]->element[15].sflags);
 446 }
 447
 448 static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
 449                                        int count, bool auto_ack)
 450 {
 451         /* ACK the newest SBAL: */
 452         if (!auto_ack)
 453                 set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK);
 454
 455         if (!q->u.in.batch_count)
 456                 q->u.in.batch_start = start;
 457         q->u.in.batch_count += count;
 458 }
 459
 460 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 461 {
 462         unsigned char state = 0;
 463         int count;
 464
 465         q->timestamp = get_tod_clock_fast();
 466
 467         /*
 468          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 469          * would return 0.
 470          */
 471         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 472         if (!count)
 473                 return 0;
 474
 475         /*
 476          * No siga sync here, as a PCI or we after a thin interrupt
 477          * already sync'ed the queues.
 478          */
 479         count = get_buf_states(q, start, &state, count, 1, 0);
 480         if (!count)
 481                 return 0;
 482
 483         switch (state) {
 484         case SLSB_P_INPUT_PRIMED:
 485                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
 486                               count);
 487
 488                 inbound_handle_work(q, start, count, is_qebsm(q));
 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(q, count);
 493                 return count;
 494         case SLSB_P_INPUT_ERROR:
 495                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
 496                               count);
 497
 498                 process_buffer_error(q, start, count);
 499                 inbound_handle_work(q, start, count, false);
 500                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 501                         qperf_inc(q, inbound_queue_full);
 502                 if (q->irq_ptr->perf_stat_enabled)
 503                         account_sbals_error(q, count);
 504                 return count;
 505         case SLSB_CU_INPUT_EMPTY:
 506                 if (q->irq_ptr->perf_stat_enabled)
 507                         q->q_stats.nr_sbal_nop++;
 508                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 509                               q->nr, start);
 510                 return 0;
 511         case SLSB_P_INPUT_NOT_INIT:
 512         case SLSB_P_INPUT_ACK:
 513                 /* We should never see this state, throw a WARN: */
 514         default:
 515                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 516                               "found state %#x at index %u on queue %u\n",
 517                               state, start, q->nr);
 518                 return 0;
 519         }
 520 }
 521
 522 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start)
 523 {
 524         int count;
 525
 526         count = get_inbound_buffer_frontier(q, start);
 527
 528         if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 529                 q->u.in.timestamp = get_tod_clock();
 530
 531         return count;
 532 }
 533
 534 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 535 {
 536         unsigned char state = 0;
 537
 538         if (!atomic_read(&q->nr_buf_used))
 539                 return 1;
 540
 541         if (need_siga_sync(q))
 542                 qdio_siga_sync_q(q);
 543         get_buf_state(q, start, &state, 0);
 544
 545         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 546                 /* more work coming */
 547                 return 0;
 548
 549         if (is_thinint_irq(q->irq_ptr))
 550                 return 1;
 551
 552         /* don't poll under z/VM */
 553         if (MACHINE_IS_VM)
 554                 return 1;
 555
 556         /*
 557          * At this point we know, that inbound first_to_check
 558          * has (probably) not moved (see qdio_inbound_processing).
 559          */
 560         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 561                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start);
 562                 return 1;
 563         } else
 564                 return 0;
 565 }
 566
 567 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 568 {
 569         unsigned char state = 0;
 570         int j, b = start;
 571
 572         for (j = 0; j < count; ++j) {
 573                 get_buf_state(q, b, &state, 0);
 574                 if (state == SLSB_P_OUTPUT_PENDING) {
 575                         struct qaob *aob = q->u.out.aobs[b];
 576                         if (aob == NULL)
 577                                 continue;
 578
 579                         q->u.out.sbal_state[b].flags |=
 580                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 581                         q->u.out.aobs[b] = NULL;
 582                 }
 583                 b = next_buf(b);
 584         }
 585 }
 586
 587 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 588                                         int bufnr)
 589 {
 590         unsigned long phys_aob = 0;
 591
 592         if (!q->aobs[bufnr]) {
 593                 struct qaob *aob = qdio_allocate_aob();
 594                 q->aobs[bufnr] = aob;
 595         }
 596         if (q->aobs[bufnr]) {
 597                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 598                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 599                 WARN_ON_ONCE(phys_aob & 0xFF);
 600         }
 601
 602         q->sbal_state[bufnr].flags = 0;
 603         return phys_aob;
 604 }
 605
 606 static void qdio_kick_handler(struct qdio_q *q, unsigned int start,
 607                               unsigned int count)
 608 {
 609         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 610                 return;
 611
 612         if (q->is_input_q) {
 613                 qperf_inc(q, inbound_handler);
 614                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 615         } else {
 616                 qperf_inc(q, outbound_handler);
 617                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 618                               start, count);
 619         }
 620
 621         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 622                    q->irq_ptr->int_parm);
 623
 624         /* for the next time */
 625         q->qdio_error = 0;
 626 }
 627
 628 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 629 {
 630         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 631                 tasklet_schedule(&q->tasklet);
 632                 return 0;
 633         }
 634         return -EPERM;
 635 }
 636
 637 static void __qdio_inbound_processing(struct qdio_q *q)
 638 {
 639         unsigned int start = q->first_to_check;
 640         int count;
 641
 642         qperf_inc(q, tasklet_inbound);
 643
 644         count = qdio_inbound_q_moved(q, start);
 645         if (count == 0)
 646                 return;
 647
 648         qdio_kick_handler(q, start, count);
 649         start = add_buf(start, count);
 650         q->first_to_check = start;
 651
 652         if (!qdio_inbound_q_done(q, start)) {
 653                 /* means poll time is not yet over */
 654                 qperf_inc(q, tasklet_inbound_resched);
 655                 if (!qdio_tasklet_schedule(q))
 656                         return;
 657         }
 658
 659         qdio_stop_polling(q);
 660         /*
 661          * We need to check again to not lose initiative after
 662          * resetting the ACK state.
 663          */
 664         if (!qdio_inbound_q_done(q, start)) {
 665                 qperf_inc(q, tasklet_inbound_resched2);
 666                 qdio_tasklet_schedule(q);
 667         }
 668 }
 669
 670 void qdio_inbound_processing(unsigned long data)
 671 {
 672         struct qdio_q *q = (struct qdio_q *)data;
 673         __qdio_inbound_processing(q);
 674 }
 675
 676 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 677 {
 678         unsigned char state = 0;
 679         int count;
 680
 681         q->timestamp = get_tod_clock_fast();
 682
 683         if (need_siga_sync(q))
 684                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 685                     !pci_out_supported(q->irq_ptr)) ||
 686                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 687                     multicast_outbound(q)))
 688                         qdio_siga_sync_q(q);
 689
 690         count = atomic_read(&q->nr_buf_used);
 691         if (!count)
 692                 return 0;
 693
 694         count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
 695         if (!count)
 696                 return 0;
 697
 698         switch (state) {
 699         case SLSB_P_OUTPUT_EMPTY:
 700         case SLSB_P_OUTPUT_PENDING:
 701                 /* the adapter got it */
 702                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 703                         "out empty:%1d %02x", q->nr, count);
 704
 705                 atomic_sub(count, &q->nr_buf_used);
 706                 if (q->irq_ptr->perf_stat_enabled)
 707                         account_sbals(q, count);
 708                 return count;
 709         case SLSB_P_OUTPUT_ERROR:
 710                 process_buffer_error(q, start, count);
 711                 atomic_sub(count, &q->nr_buf_used);
 712                 if (q->irq_ptr->perf_stat_enabled)
 713                         account_sbals_error(q, count);
 714                 return count;
 715         case SLSB_CU_OUTPUT_PRIMED:
 716                 /* the adapter has not fetched the output yet */
 717                 if (q->irq_ptr->perf_stat_enabled)
 718                         q->q_stats.nr_sbal_nop++;
 719                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 720                               q->nr);
 721                 return 0;
 722         case SLSB_P_OUTPUT_HALTED:
 723                 return 0;
 724         case SLSB_P_OUTPUT_NOT_INIT:
 725                 /* We should never see this state, throw a WARN: */
 726         default:
 727                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 728                               "found state %#x at index %u on queue %u\n",
 729                               state, start, q->nr);
 730                 return 0;
 731         }
 732 }
 733
 734 /* all buffers processed? */
 735 static inline int qdio_outbound_q_done(struct qdio_q *q)
 736 {
 737         return atomic_read(&q->nr_buf_used) == 0;
 738 }
 739
 740 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
 741 {
 742         int count;
 743
 744         count = get_outbound_buffer_frontier(q, start);
 745
 746         if (count) {
 747                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 748                 if (q->u.out.use_cq)
 749                         qdio_handle_aobs(q, start, count);
 750         }
 751
 752         return count;
 753 }
 754
 755 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 756                                 unsigned long aob)
 757 {
 758         int retries = 0, cc;
 759         unsigned int busy_bit;
 760
 761         if (!need_siga_out(q))
 762                 return 0;
 763
 764         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 765 retry:
 766         qperf_inc(q, siga_write);
 767
 768         cc = qdio_siga_output(q, count, &busy_bit, aob);
 769         switch (cc) {
 770         case 0:
 771                 break;
 772         case 2:
 773                 if (busy_bit) {
 774                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 775                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 776                                 goto retry;
 777                         }
 778                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 779                         cc = -EBUSY;
 780                 } else {
 781                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 782                         cc = -ENOBUFS;
 783                 }
 784                 break;
 785         case 1:
 786         case 3:
 787                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 788                 cc = -EIO;
 789                 break;
 790         }
 791         if (retries) {
 792                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 793                 DBF_ERROR("count:%u", retries);
 794         }
 795         return cc;
 796 }
 797
 798 static void __qdio_outbound_processing(struct qdio_q *q)
 799 {
 800         unsigned int start = q->first_to_check;
 801         int count;
 802
 803         qperf_inc(q, tasklet_outbound);
 804         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 805
 806         count = qdio_outbound_q_moved(q, start);
 807         if (count) {
 808                 q->first_to_check = add_buf(start, count);
 809                 qdio_kick_handler(q, start, count);
 810         }
 811
 812         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 813             !qdio_outbound_q_done(q))
 814                 goto sched;
 815
 816         if (q->u.out.pci_out_enabled)
 817                 return;
 818
 819         /*
 820          * Now we know that queue type is either qeth without pci enabled
 821          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 822          * is noticed and outbound_handler is called after some time.
 823          */
 824         if (qdio_outbound_q_done(q))
 825                 del_timer_sync(&q->u.out.timer);
 826         else
 827                 if (!timer_pending(&q->u.out.timer) &&
 828                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 829                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 830         return;
 831
 832 sched:
 833         qdio_tasklet_schedule(q);
 834 }
 835
 836 /* outbound tasklet */
 837 void qdio_outbound_processing(unsigned long data)
 838 {
 839         struct qdio_q *q = (struct qdio_q *)data;
 840         __qdio_outbound_processing(q);
 841 }
 842
 843 void qdio_outbound_timer(struct timer_list *t)
 844 {
 845         struct qdio_q *q = from_timer(q, t, u.out.timer);
 846
 847         qdio_tasklet_schedule(q);
 848 }
 849
 850 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 851 {
 852         struct qdio_q *out;
 853         int i;
 854
 855         if (!pci_out_supported(irq) || !irq->scan_threshold)
 856                 return;
 857
 858         for_each_output_queue(irq, out, i)
 859                 if (!qdio_outbound_q_done(out))
 860                         qdio_tasklet_schedule(out);
 861 }
 862
 863 void tiqdio_inbound_processing(unsigned long data)
 864 {
 865         struct qdio_q *q = (struct qdio_q *)data;
 866
 867         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 868                 qdio_sync_queues(q);
 869
 870         /* The interrupt could be caused by a PCI request: */
 871         qdio_check_outbound_pci_queues(q->irq_ptr);
 872
 873         __qdio_inbound_processing(q);
 874 }
 875
 876 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 877                                   enum qdio_irq_states state)
 878 {
 879         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 880
 881         irq_ptr->state = state;
 882         mb();
 883 }
 884
 885 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 886 {
 887         if (irb->esw.esw0.erw.cons) {
 888                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 889                 DBF_ERROR_HEX(irb, 64);
 890                 DBF_ERROR_HEX(irb->ecw, 64);
 891         }
 892 }
 893
 894 /* PCI interrupt handler */
 895 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 896 {
 897         int i;
 898         struct qdio_q *q;
 899
 900         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 901                 return;
 902
 903         if (irq_ptr->irq_poll) {
 904                 if (!test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
 905                         irq_ptr->irq_poll(irq_ptr->cdev, irq_ptr->int_parm);
 906                 else
 907                         QDIO_PERF_STAT_INC(irq_ptr, int_discarded);
 908         } else {
 909                 for_each_input_queue(irq_ptr, q, i)
 910                         tasklet_schedule(&q->tasklet);
 911         }
 912
 913         if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold)
 914                 return;
 915
 916         for_each_output_queue(irq_ptr, q, i) {
 917                 if (qdio_outbound_q_done(q))
 918                         continue;
 919                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 920                         qdio_siga_sync_q(q);
 921                 qdio_tasklet_schedule(q);
 922         }
 923 }
 924
 925 static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
 926                                        unsigned long intparm, int cstat,
 927                                        int dstat)
 928 {
 929         struct qdio_q *q;
 930
 931         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 932         DBF_ERROR("intp :%lx", intparm);
 933         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 934
 935         if (irq_ptr->nr_input_qs) {
 936                 q = irq_ptr->input_qs[0];
 937         } else if (irq_ptr->nr_output_qs) {
 938                 q = irq_ptr->output_qs[0];
 939         } else {
 940                 dump_stack();
 941                 goto no_handler;
 942         }
 943
 944         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
 945                    q->nr, q->first_to_check, 0, irq_ptr->int_parm);
 946 no_handler:
 947         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 948         /*
 949          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
 950          * Therefore we call the LGR detection function here.
 951          */
 952         lgr_info_log();
 953 }
 954
 955 static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat,
 956                                       int dstat)
 957 {
 958         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 959
 960         if (cstat)
 961                 goto error;
 962         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 963                 goto error;
 964         if (!(dstat & DEV_STAT_DEV_END))
 965                 goto error;
 966         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 967         return;
 968
 969 error:
 970         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 971         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 972         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 973 }
 974
 975 /* qdio interrupt handler */
 976 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 977                       struct irb *irb)
 978 {
 979         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 980         struct subchannel_id schid;
 981         int cstat, dstat;
 982
 983         if (!intparm || !irq_ptr) {
 984                 ccw_device_get_schid(cdev, &schid);
 985                 DBF_ERROR("qint:%4x", schid.sch_no);
 986                 return;
 987         }
 988
 989         if (irq_ptr->perf_stat_enabled)
 990                 irq_ptr->perf_stat.qdio_int++;
 991
 992         if (IS_ERR(irb)) {
 993                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 994                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 995                 wake_up(&cdev->private->wait_q);
 996                 return;
 997         }
 998         qdio_irq_check_sense(irq_ptr, irb);
 999         cstat = irb->scsw.cmd.cstat;
1000         dstat = irb->scsw.cmd.dstat;
1001
1002         switch (irq_ptr->state) {
1003         case QDIO_IRQ_STATE_INACTIVE:
1004                 qdio_establish_handle_irq(irq_ptr, cstat, dstat);
1005                 break;
1006         case QDIO_IRQ_STATE_CLEANUP:
1007                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1008                 break;
1009         case QDIO_IRQ_STATE_ESTABLISHED:
1010         case QDIO_IRQ_STATE_ACTIVE:
1011                 if (cstat & SCHN_STAT_PCI) {
1012                         qdio_int_handler_pci(irq_ptr);
1013                         return;
1014                 }
1015                 if (cstat || dstat)
1016                         qdio_handle_activate_check(irq_ptr, intparm, cstat,
1017                                                    dstat);
1018                 break;
1019         case QDIO_IRQ_STATE_STOPPED:
1020                 break;
1021         default:
1022                 WARN_ON_ONCE(1);
1023         }
1024         wake_up(&cdev->private->wait_q);
1025 }
1026
1027 /**
1028  * qdio_get_ssqd_desc - get qdio subchannel description
1029  * @cdev: ccw device to get description for
1030  * @data: where to store the ssqd
1031  *
1032  * Returns 0 or an error code. The results of the chsc are stored in the
1033  * specified structure.
1034  */
1035 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1036                        struct qdio_ssqd_desc *data)
1037 {
1038         struct subchannel_id schid;
1039
1040         if (!cdev || !cdev->private)
1041                 return -EINVAL;
1042
1043         ccw_device_get_schid(cdev, &schid);
1044         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1045         return qdio_setup_get_ssqd(NULL, &schid, data);
1046 }
1047 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1048
1049 static void qdio_shutdown_queues(struct qdio_irq *irq_ptr)
1050 {
1051         struct qdio_q *q;
1052         int i;
1053
1054         for_each_input_queue(irq_ptr, q, i)
1055                 tasklet_kill(&q->tasklet);
1056
1057         for_each_output_queue(irq_ptr, q, i) {
1058                 del_timer_sync(&q->u.out.timer);
1059                 tasklet_kill(&q->tasklet);
1060         }
1061 }
1062
1063 /**
1064  * qdio_shutdown - shut down a qdio subchannel
1065  * @cdev: associated ccw device
1066  * @how: use halt or clear to shutdown
1067  */
1068 int qdio_shutdown(struct ccw_device *cdev, int how)
1069 {
1070         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1071         struct subchannel_id schid;
1072         int rc;
1073
1074         if (!irq_ptr)
1075                 return -ENODEV;
1076
1077         WARN_ON_ONCE(irqs_disabled());
1078         ccw_device_get_schid(cdev, &schid);
1079         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1080
1081         mutex_lock(&irq_ptr->setup_mutex);
1082         /*
1083          * Subchannel was already shot down. We cannot prevent being called
1084          * twice since cio may trigger a shutdown asynchronously.
1085          */
1086         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1087                 mutex_unlock(&irq_ptr->setup_mutex);
1088                 return 0;
1089         }
1090
1091         /*
1092          * Indicate that the device is going down. Scheduling the queue
1093          * tasklets is forbidden from here on.
1094          */
1095         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1096
1097         tiqdio_remove_device(irq_ptr);
1098         qdio_shutdown_queues(irq_ptr);
1099         qdio_shutdown_debug_entries(irq_ptr);
1100
1101         /* cleanup subchannel */
1102         spin_lock_irq(get_ccwdev_lock(cdev));
1103         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1104         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1105                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1106         else
1107                 /* default behaviour is halt */
1108                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1109         spin_unlock_irq(get_ccwdev_lock(cdev));
1110         if (rc) {
1111                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1112                 DBF_ERROR("rc:%4d", rc);
1113                 goto no_cleanup;
1114         }
1115
1116         wait_event_interruptible_timeout(cdev->private->wait_q,
1117                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1118                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1119                 10 * HZ);
1120
1121 no_cleanup:
1122         qdio_shutdown_thinint(irq_ptr);
1123         qdio_shutdown_irq(irq_ptr);
1124
1125         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1126         mutex_unlock(&irq_ptr->setup_mutex);
1127         if (rc)
1128                 return rc;
1129         return 0;
1130 }
1131 EXPORT_SYMBOL_GPL(qdio_shutdown);
1132
1133 /**
1134  * qdio_free - free data structures for a qdio subchannel
1135  * @cdev: associated ccw device
1136  */
1137 int qdio_free(struct ccw_device *cdev)
1138 {
1139         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1140         struct subchannel_id schid;
1141
1142         if (!irq_ptr)
1143                 return -ENODEV;
1144
1145         ccw_device_get_schid(cdev, &schid);
1146         DBF_EVENT("qfree:%4x", schid.sch_no);
1147         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1148         mutex_lock(&irq_ptr->setup_mutex);
1149
1150         irq_ptr->debug_area = NULL;
1151         cdev->private->qdio_data = NULL;
1152         mutex_unlock(&irq_ptr->setup_mutex);
1153
1154         qdio_free_async_data(irq_ptr);
1155         qdio_free_queues(irq_ptr);
1156         free_page((unsigned long) irq_ptr->qdr);
1157         free_page(irq_ptr->chsc_page);
1158         free_page((unsigned long) irq_ptr);
1159         return 0;
1160 }
1161 EXPORT_SYMBOL_GPL(qdio_free);
1162
1163 /**
1164  * qdio_allocate - allocate qdio queues and associated data
1165  * @cdev: associated ccw device
1166  * @no_input_qs: allocate this number of Input Queues
1167  * @no_output_qs: allocate this number of Output Queues
1168  */
1169 int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
1170                   unsigned int no_output_qs)
1171 {
1172         struct subchannel_id schid;
1173         struct qdio_irq *irq_ptr;
1174         int rc = -ENOMEM;
1175
1176         ccw_device_get_schid(cdev, &schid);
1177         DBF_EVENT("qallocate:%4x", schid.sch_no);
1178
1179         if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
1180             no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
1181                 return -EINVAL;
1182
1183         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1184         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1185         if (!irq_ptr)
1186                 return -ENOMEM;
1187
1188         irq_ptr->cdev = cdev;
1189         mutex_init(&irq_ptr->setup_mutex);
1190         if (qdio_allocate_dbf(irq_ptr))
1191                 goto err_dbf;
1192
1193         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
1194                       no_output_qs);
1195
1196         /*
1197          * Allocate a page for the chsc calls in qdio_establish.
1198          * Must be pre-allocated since a zfcp recovery will call
1199          * qdio_establish. In case of low memory and swap on a zfcp disk
1200          * we may not be able to allocate memory otherwise.
1201          */
1202         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1203         if (!irq_ptr->chsc_page)
1204                 goto err_chsc;
1205
1206         /* qdr is used in ccw1.cda which is u32 */
1207         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1208         if (!irq_ptr->qdr)
1209                 goto err_qdr;
1210
1211         rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
1212         if (rc)
1213                 goto err_queues;
1214
1215         INIT_LIST_HEAD(&irq_ptr->entry);
1216         cdev->private->qdio_data = irq_ptr;
1217         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1218         return 0;
1219
1220 err_queues:
1221         free_page((unsigned long) irq_ptr->qdr);
1222 err_qdr:
1223         free_page(irq_ptr->chsc_page);
1224 err_chsc:
1225 err_dbf:
1226         free_page((unsigned long) irq_ptr);
1227         return rc;
1228 }
1229 EXPORT_SYMBOL_GPL(qdio_allocate);
1230
1231 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1232 {
1233         struct qdio_q *q = irq_ptr->input_qs[0];
1234         int i, use_cq = 0;
1235
1236         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1237                 use_cq = 1;
1238
1239         for_each_output_queue(irq_ptr, q, i) {
1240                 if (use_cq) {
1241                         if (multicast_outbound(q))
1242                                 continue;
1243                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1244                                 use_cq = 0;
1245                                 continue;
1246                         }
1247                 } else
1248                         qdio_disable_async_operation(&q->u.out);
1249         }
1250         DBF_EVENT("use_cq:%d", use_cq);
1251 }
1252
1253 static void qdio_trace_init_data(struct qdio_irq *irq,
1254                                  struct qdio_initialize *data)
1255 {
1256         DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
1257         DBF_DEV_HEX(irq, data->adapter_name, 8, DBF_ERR);
1258         DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
1259         DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
1260         DBF_DEV_HEX(irq, &data->input_slib_elements, sizeof(void *), DBF_ERR);
1261         DBF_DEV_HEX(irq, &data->output_slib_elements, sizeof(void *), DBF_ERR);
1262         DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
1263                       data->no_output_qs);
1264         DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
1265         DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
1266         DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
1267         DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
1268         DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
1269                     DBF_ERR);
1270 }
1271
1272 /**
1273  * qdio_establish - establish queues on a qdio subchannel
1274  * @cdev: associated ccw device
1275  * @init_data: initialization data
1276  */
1277 int qdio_establish(struct ccw_device *cdev,
1278                    struct qdio_initialize *init_data)
1279 {
1280         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1281         struct subchannel_id schid;
1282         int rc;
1283
1284         ccw_device_get_schid(cdev, &schid);
1285         DBF_EVENT("qestablish:%4x", schid.sch_no);
1286
1287         if (!irq_ptr)
1288                 return -ENODEV;
1289
1290         if (init_data->no_input_qs > irq_ptr->max_input_qs ||
1291             init_data->no_output_qs > irq_ptr->max_output_qs)
1292                 return -EINVAL;
1293
1294         if ((init_data->no_input_qs && !init_data->input_handler) ||
1295             (init_data->no_output_qs && !init_data->output_handler))
1296                 return -EINVAL;
1297
1298         if (!init_data->input_sbal_addr_array ||
1299             !init_data->output_sbal_addr_array)
1300                 return -EINVAL;
1301
1302         mutex_lock(&irq_ptr->setup_mutex);
1303         qdio_trace_init_data(irq_ptr, init_data);
1304         qdio_setup_irq(irq_ptr, init_data);
1305
1306         rc = qdio_establish_thinint(irq_ptr);
1307         if (rc) {
1308                 qdio_shutdown_irq(irq_ptr);
1309                 mutex_unlock(&irq_ptr->setup_mutex);
1310                 return rc;
1311         }
1312
1313         /* establish q */
1314         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1315         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1316         irq_ptr->ccw.count = irq_ptr->equeue.count;
1317         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1318
1319         spin_lock_irq(get_ccwdev_lock(cdev));
1320         ccw_device_set_options_mask(cdev, 0);
1321
1322         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1323         spin_unlock_irq(get_ccwdev_lock(cdev));
1324         if (rc) {
1325                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1326                 DBF_ERROR("rc:%4x", rc);
1327                 qdio_shutdown_thinint(irq_ptr);
1328                 qdio_shutdown_irq(irq_ptr);
1329                 mutex_unlock(&irq_ptr->setup_mutex);
1330                 return rc;
1331         }
1332
1333         wait_event_interruptible_timeout(cdev->private->wait_q,
1334                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1335                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1336
1337         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1338                 mutex_unlock(&irq_ptr->setup_mutex);
1339                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1340                 return -EIO;
1341         }
1342
1343         qdio_setup_ssqd_info(irq_ptr);
1344
1345         qdio_detect_hsicq(irq_ptr);
1346
1347         /* qebsm is now setup if available, initialize buffer states */
1348         qdio_init_buf_states(irq_ptr);
1349
1350         mutex_unlock(&irq_ptr->setup_mutex);
1351         qdio_print_subchannel_info(irq_ptr);
1352         qdio_setup_debug_entries(irq_ptr);
1353         return 0;
1354 }
1355 EXPORT_SYMBOL_GPL(qdio_establish);
1356
1357 /**
1358  * qdio_activate - activate queues on a qdio subchannel
1359  * @cdev: associated cdev
1360  */
1361 int qdio_activate(struct ccw_device *cdev)
1362 {
1363         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1364         struct subchannel_id schid;
1365         int rc;
1366
1367         ccw_device_get_schid(cdev, &schid);
1368         DBF_EVENT("qactivate:%4x", schid.sch_no);
1369
1370         if (!irq_ptr)
1371                 return -ENODEV;
1372
1373         mutex_lock(&irq_ptr->setup_mutex);
1374         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1375                 rc = -EBUSY;
1376                 goto out;
1377         }
1378
1379         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1380         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1381         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1382         irq_ptr->ccw.cda = 0;
1383
1384         spin_lock_irq(get_ccwdev_lock(cdev));
1385         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1386
1387         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1388                               0, DOIO_DENY_PREFETCH);
1389         spin_unlock_irq(get_ccwdev_lock(cdev));
1390         if (rc) {
1391                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1392                 DBF_ERROR("rc:%4x", rc);
1393                 goto out;
1394         }
1395
1396         if (is_thinint_irq(irq_ptr))
1397                 tiqdio_add_device(irq_ptr);
1398
1399         /* wait for subchannel to become active */
1400         msleep(5);
1401
1402         switch (irq_ptr->state) {
1403         case QDIO_IRQ_STATE_STOPPED:
1404         case QDIO_IRQ_STATE_ERR:
1405                 rc = -EIO;
1406                 break;
1407         default:
1408                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1409                 rc = 0;
1410         }
1411 out:
1412         mutex_unlock(&irq_ptr->setup_mutex);
1413         return rc;
1414 }
1415 EXPORT_SYMBOL_GPL(qdio_activate);
1416
1417 /**
1418  * handle_inbound - reset processed input buffers
1419  * @q: queue containing the buffers
1420  * @callflags: flags
1421  * @bufnr: first buffer to process
1422  * @count: how many buffers are emptied
1423  */
1424 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1425                           int bufnr, int count)
1426 {
1427         int overlap;
1428
1429         qperf_inc(q, inbound_call);
1430
1431         /* If any processed SBALs are returned to HW, adjust our tracking: */
1432         overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
1433                              q->u.in.batch_count);
1434         if (overlap > 0) {
1435                 q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
1436                 q->u.in.batch_count -= overlap;
1437         }
1438
1439         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1440         atomic_add(count, &q->nr_buf_used);
1441
1442         if (need_siga_in(q))
1443                 return qdio_siga_input(q);
1444
1445         return 0;
1446 }
1447
1448 /**
1449  * handle_outbound - process filled outbound buffers
1450  * @q: queue containing the buffers
1451  * @callflags: flags
1452  * @bufnr: first buffer to process
1453  * @count: how many buffers are filled
1454  */
1455 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1456                            unsigned int bufnr, unsigned int count)
1457 {
1458         const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
1459         unsigned char state = 0;
1460         int used, rc = 0;
1461
1462         qperf_inc(q, outbound_call);
1463
1464         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1465         used = atomic_add_return(count, &q->nr_buf_used);
1466
1467         if (used == QDIO_MAX_BUFFERS_PER_Q)
1468                 qperf_inc(q, outbound_queue_full);
1469
1470         if (callflags & QDIO_FLAG_PCI_OUT) {
1471                 q->u.out.pci_out_enabled = 1;
1472                 qperf_inc(q, pci_request_int);
1473         } else
1474                 q->u.out.pci_out_enabled = 0;
1475
1476         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1477                 unsigned long phys_aob = 0;
1478
1479                 if (q->u.out.use_cq && count == 1)
1480                         phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1481
1482                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1483         } else if (need_siga_sync(q)) {
1484                 rc = qdio_siga_sync_q(q);
1485         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1486                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1487                    state == SLSB_CU_OUTPUT_PRIMED) {
1488                 /* The previous buffer is not processed yet, tack on. */
1489                 qperf_inc(q, fast_requeue);
1490         } else {
1491                 rc = qdio_kick_outbound_q(q, count, 0);
1492         }
1493
1494         /* Let drivers implement their own completion scanning: */
1495         if (!scan_threshold)
1496                 return rc;
1497
1498         /* in case of SIGA errors we must process the error immediately */
1499         if (used >= scan_threshold || rc)
1500                 qdio_tasklet_schedule(q);
1501         else
1502                 /* free the SBALs in case of no further traffic */
1503                 if (!timer_pending(&q->u.out.timer) &&
1504                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1505                         mod_timer(&q->u.out.timer, jiffies + HZ);
1506         return rc;
1507 }
1508
1509 /**
1510  * do_QDIO - process input or output buffers
1511  * @cdev: associated ccw_device for the qdio subchannel
1512  * @callflags: input or output and special flags from the program
1513  * @q_nr: queue number
1514  * @bufnr: buffer number
1515  * @count: how many buffers to process
1516  */
1517 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1518             int q_nr, unsigned int bufnr, unsigned int count)
1519 {
1520         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1521
1522         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1523                 return -EINVAL;
1524
1525         if (!irq_ptr)
1526                 return -ENODEV;
1527
1528         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1529                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1530
1531         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1532                 return -EIO;
1533         if (!count)
1534                 return 0;
1535         if (callflags & QDIO_FLAG_SYNC_INPUT)
1536                 return handle_inbound(irq_ptr->input_qs[q_nr],
1537                                       callflags, bufnr, count);
1538         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1539                 return handle_outbound(irq_ptr->output_qs[q_nr],
1540                                        callflags, bufnr, count);
1541         return -EINVAL;
1542 }
1543 EXPORT_SYMBOL_GPL(do_QDIO);
1544
1545 /**
1546  * qdio_start_irq - enable interrupt processing for the device
1547  * @cdev: associated ccw_device for the qdio subchannel
1548  *
1549  * Return codes
1550  *   0 - success
1551  *   1 - irqs not started since new data is available
1552  */
1553 int qdio_start_irq(struct ccw_device *cdev)
1554 {
1555         struct qdio_q *q;
1556         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1557         unsigned int i;
1558
1559         if (!irq_ptr)
1560                 return -ENODEV;
1561
1562         for_each_input_queue(irq_ptr, q, i)
1563                 qdio_stop_polling(q);
1564
1565         clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
1566
1567         /*
1568          * We need to check again to not lose initiative after
1569          * resetting the ACK state.
1570          */
1571         if (test_nonshared_ind(irq_ptr))
1572                 goto rescan;
1573
1574         for_each_input_queue(irq_ptr, q, i) {
1575                 if (!qdio_inbound_q_done(q, q->first_to_check))
1576                         goto rescan;
1577         }
1578
1579         return 0;
1580
1581 rescan:
1582         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1583                 return 0;
1584         else
1585                 return 1;
1586
1587 }
1588 EXPORT_SYMBOL(qdio_start_irq);
1589
1590 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
1591                                 unsigned int *error)
1592 {
1593         unsigned int start = q->first_to_check;
1594         int count;
1595
1596         count = q->is_input_q ? qdio_inbound_q_moved(q, start) :
1597                                 qdio_outbound_q_moved(q, start);
1598         if (count == 0)
1599                 return 0;
1600
1601         *bufnr = start;
1602         *error = q->qdio_error;
1603
1604         /* for the next time */
1605         q->first_to_check = add_buf(start, count);
1606         q->qdio_error = 0;
1607
1608         return count;
1609 }
1610
1611 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
1612                        unsigned int *bufnr, unsigned int *error)
1613 {
1614         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1615         struct qdio_q *q;
1616
1617         if (!irq_ptr)
1618                 return -ENODEV;
1619         q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
1620
1621         if (need_siga_sync(q))
1622                 qdio_siga_sync_q(q);
1623
1624         return __qdio_inspect_queue(q, bufnr, error);
1625 }
1626 EXPORT_SYMBOL_GPL(qdio_inspect_queue);
1627
1628 /**
1629  * qdio_get_next_buffers - process input buffers
1630  * @cdev: associated ccw_device for the qdio subchannel
1631  * @nr: input queue number
1632  * @bufnr: first filled buffer number
1633  * @error: buffers are in error state
1634  *
1635  * Return codes
1636  *   < 0 - error
1637  *   = 0 - no new buffers found
1638  *   > 0 - number of processed buffers
1639  */
1640 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1641                           int *error)
1642 {
1643         struct qdio_q *q;
1644         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1645
1646         if (!irq_ptr)
1647                 return -ENODEV;
1648         q = irq_ptr->input_qs[nr];
1649
1650         /*
1651          * Cannot rely on automatic sync after interrupt since queues may
1652          * also be examined without interrupt.
1653          */
1654         if (need_siga_sync(q))
1655                 qdio_sync_queues(q);
1656
1657         qdio_check_outbound_pci_queues(irq_ptr);
1658
1659         /* Note: upper-layer MUST stop processing immediately here ... */
1660         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1661                 return -EIO;
1662
1663         return __qdio_inspect_queue(q, bufnr, error);
1664 }
1665 EXPORT_SYMBOL(qdio_get_next_buffers);
1666
1667 /**
1668  * qdio_stop_irq - disable interrupt processing for the device
1669  * @cdev: associated ccw_device for the qdio subchannel
1670  *
1671  * Return codes
1672  *   0 - interrupts were already disabled
1673  *   1 - interrupts successfully disabled
1674  */
1675 int qdio_stop_irq(struct ccw_device *cdev)
1676 {
1677         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1678
1679         if (!irq_ptr)
1680                 return -ENODEV;
1681
1682         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1683                 return 0;
1684         else
1685                 return 1;
1686 }
1687 EXPORT_SYMBOL(qdio_stop_irq);
1688
1689 static int __init init_QDIO(void)
1690 {
1691         int rc;
1692
1693         rc = qdio_debug_init();
1694         if (rc)
1695                 return rc;
1696         rc = qdio_setup_init();
1697         if (rc)
1698                 goto out_debug;
1699         rc = qdio_thinint_init();
1700         if (rc)
1701                 goto out_cache;
1702         return 0;
1703
1704 out_cache:
1705         qdio_setup_exit();
1706 out_debug:
1707         qdio_debug_exit();
1708         return rc;
1709 }
1710
1711 static void __exit exit_QDIO(void)
1712 {
1713         qdio_thinint_exit();
1714         qdio_setup_exit();
1715         qdio_debug_exit();
1716 }
1717
1718 module_init(init_QDIO);
1719 module_exit(exit_QDIO);