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 <[email protected]>
   7  *            Jan Glauber <[email protected]>
   8  * 2.6 cio integration by Cornelia Huck <[email protected]>
   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 <[email protected]>,"\
  29         "Jan Glauber <[email protected]>");
  30 MODULE_DESCRIPTION("QDIO base support");
  31 MODULE_LICENSE("GPL");
  32
  33 static inline int do_siga_sync(unsigned long schid,
  34                                unsigned int out_mask, unsigned int in_mask,
  35                                unsigned int fc)
  36 {
  37         register unsigned long __fc asm ("0") = fc;
  38         register unsigned long __schid asm ("1") = schid;
  39         register unsigned long out asm ("2") = out_mask;
  40         register unsigned long in asm ("3") = in_mask;
  41         int cc;
  42
  43         asm volatile(
  44                 "       siga    0\n"
  45                 "       ipm     %0\n"
  46                 "       srl     %0,28\n"
  47                 : "=d" (cc)
  48                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  49         return cc;
  50 }
  51
  52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  53                                 unsigned int fc)
  54 {
  55         register unsigned long __fc asm ("0") = fc;
  56         register unsigned long __schid asm ("1") = schid;
  57         register unsigned long __mask asm ("2") = mask;
  58         int cc;
  59
  60         asm volatile(
  61                 "       siga    0\n"
  62                 "       ipm     %0\n"
  63                 "       srl     %0,28\n"
  64                 : "=d" (cc)
  65                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  66         return cc;
  67 }
  68
  69 /**
  70  * do_siga_output - perform SIGA-w/wt function
  71  * @schid: subchannel id or in case of QEBSM the subchannel token
  72  * @mask: which output queues to process
  73  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  74  * @fc: function code to perform
  75  * @aob: asynchronous operation block
  76  *
  77  * Returns condition code.
  78  * Note: For IQDC unicast queues only the highest priority queue is processed.
  79  */
  80 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  81                                  unsigned int *bb, unsigned int fc,
  82                                  unsigned long aob)
  83 {
  84         register unsigned long __fc asm("0") = fc;
  85         register unsigned long __schid asm("1") = schid;
  86         register unsigned long __mask asm("2") = mask;
  87         register unsigned long __aob asm("3") = aob;
  88         int cc;
  89
  90         asm volatile(
  91                 "       siga    0\n"
  92                 "       ipm     %0\n"
  93                 "       srl     %0,28\n"
  94                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  95                 : "d" (__schid), "d" (__mask)
  96                 : "cc");
  97         *bb = __fc >> 31;
  98         return cc;
  99 }
 100
 101 /**
 102  * qdio_do_eqbs - extract buffer states for QEBSM
 103  * @q: queue to manipulate
 104  * @state: state of the extracted buffers
 105  * @start: buffer number to start at
 106  * @count: count of buffers to examine
 107  * @auto_ack: automatically acknowledge buffers
 108  *
 109  * Returns the number of successfully extracted equal buffer states.
 110  * Stops processing if a state is different from the last buffers state.
 111  */
 112 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 113                         int start, int count, int auto_ack)
 114 {
 115         int tmp_count = count, tmp_start = start, nr = q->nr;
 116         unsigned int ccq = 0;
 117
 118         qperf_inc(q, eqbs);
 119
 120         if (!q->is_input_q)
 121                 nr += q->irq_ptr->nr_input_qs;
 122 again:
 123         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 124                       auto_ack);
 125
 126         switch (ccq) {
 127         case 0:
 128         case 32:
 129                 /* all done, or next buffer state different */
 130                 return count - tmp_count;
 131         case 96:
 132                 /* not all buffers processed */
 133                 qperf_inc(q, eqbs_partial);
 134                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "EQBS part:%02x",
 135                         tmp_count);
 136                 return count - tmp_count;
 137         case 97:
 138                 /* no buffer processed */
 139                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 140                 goto again;
 141         default:
 142                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 143                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 144                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 145                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr,
 146                            q->first_to_check, count, q->irq_ptr->int_parm);
 147                 return 0;
 148         }
 149 }
 150
 151 /**
 152  * qdio_do_sqbs - set buffer states for QEBSM
 153  * @q: queue to manipulate
 154  * @state: new state of the buffers
 155  * @start: first buffer number to change
 156  * @count: how many buffers to change
 157  *
 158  * Returns the number of successfully changed buffers.
 159  * Does retrying until the specified count of buffer states is set or an
 160  * error occurs.
 161  */
 162 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 163                         int count)
 164 {
 165         unsigned int ccq = 0;
 166         int tmp_count = count, tmp_start = start;
 167         int nr = q->nr;
 168
 169         if (!count)
 170                 return 0;
 171         qperf_inc(q, sqbs);
 172
 173         if (!q->is_input_q)
 174                 nr += q->irq_ptr->nr_input_qs;
 175 again:
 176         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 177
 178         switch (ccq) {
 179         case 0:
 180         case 32:
 181                 /* all done, or active buffer adapter-owned */
 182                 WARN_ON_ONCE(tmp_count);
 183                 return count - tmp_count;
 184         case 96:
 185                 /* not all buffers processed */
 186                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 187                 qperf_inc(q, sqbs_partial);
 188                 goto again;
 189         default:
 190                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 191                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 192                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 193                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE, q->nr,
 194                            q->first_to_check, count, q->irq_ptr->int_parm);
 195                 return 0;
 196         }
 197 }
 198
 199 /*
 200  * Returns number of examined buffers and their common state in *state.
 201  * Requested number of buffers-to-examine must be > 0.
 202  */
 203 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 204                                  unsigned char *state, unsigned int count,
 205                                  int auto_ack, int merge_pending)
 206 {
 207         unsigned char __state = 0;
 208         int i = 1;
 209
 210         if (is_qebsm(q))
 211                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 212
 213         /* get initial state: */
 214         __state = q->slsb.val[bufnr];
 215
 216         /* Bail out early if there is no work on the queue: */
 217         if (__state & SLSB_OWNER_CU)
 218                 goto out;
 219
 220         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 221                 __state = SLSB_P_OUTPUT_EMPTY;
 222
 223         for (; i < count; i++) {
 224                 bufnr = next_buf(bufnr);
 225
 226                 /* merge PENDING into EMPTY: */
 227                 if (merge_pending &&
 228                     q->slsb.val[bufnr] == SLSB_P_OUTPUT_PENDING &&
 229                     __state == SLSB_P_OUTPUT_EMPTY)
 230                         continue;
 231
 232                 /* stop if next state differs from initial state: */
 233                 if (q->slsb.val[bufnr] != __state)
 234                         break;
 235         }
 236
 237 out:
 238         *state = __state;
 239         return i;
 240 }
 241
 242 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 243                                 unsigned char *state, int auto_ack)
 244 {
 245         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 246 }
 247
 248 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 249 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 250                                  unsigned char state, int count)
 251 {
 252         int i;
 253
 254         if (is_qebsm(q))
 255                 return qdio_do_sqbs(q, state, bufnr, count);
 256
 257         /* Ensure that all preceding changes to the SBALs are visible: */
 258         mb();
 259
 260         for (i = 0; i < count; i++) {
 261                 WRITE_ONCE(q->slsb.val[bufnr], state);
 262                 bufnr = next_buf(bufnr);
 263         }
 264
 265         /* Make our SLSB changes visible: */
 266         mb();
 267
 268         return count;
 269 }
 270
 271 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 272                                 unsigned char state)
 273 {
 274         return set_buf_states(q, bufnr, state, 1);
 275 }
 276
 277 /* set slsb states to initial state */
 278 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 279 {
 280         struct qdio_q *q;
 281         int i;
 282
 283         for_each_input_queue(irq_ptr, q, i)
 284                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 285                                QDIO_MAX_BUFFERS_PER_Q);
 286         for_each_output_queue(irq_ptr, q, i)
 287                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 288                                QDIO_MAX_BUFFERS_PER_Q);
 289 }
 290
 291 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 292                           unsigned int input)
 293 {
 294         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 295         unsigned int fc = QDIO_SIGA_SYNC;
 296         int cc;
 297
 298         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 299         qperf_inc(q, siga_sync);
 300
 301         if (is_qebsm(q)) {
 302                 schid = q->irq_ptr->sch_token;
 303                 fc |= QDIO_SIGA_QEBSM_FLAG;
 304         }
 305
 306         cc = do_siga_sync(schid, output, input, fc);
 307         if (unlikely(cc))
 308                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 309         return (cc) ? -EIO : 0;
 310 }
 311
 312 static inline int qdio_siga_sync_q(struct qdio_q *q)
 313 {
 314         if (q->is_input_q)
 315                 return qdio_siga_sync(q, 0, q->mask);
 316         else
 317                 return qdio_siga_sync(q, q->mask, 0);
 318 }
 319
 320 static int qdio_siga_output(struct qdio_q *q, unsigned int count,
 321                             unsigned int *busy_bit, unsigned long aob)
 322 {
 323         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 324         unsigned int fc = QDIO_SIGA_WRITE;
 325         u64 start_time = 0;
 326         int retries = 0, cc;
 327
 328         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
 329                 if (count > 1)
 330                         fc = QDIO_SIGA_WRITEM;
 331                 else if (aob)
 332                         fc = QDIO_SIGA_WRITEQ;
 333         }
 334
 335         if (is_qebsm(q)) {
 336                 schid = q->irq_ptr->sch_token;
 337                 fc |= QDIO_SIGA_QEBSM_FLAG;
 338         }
 339 again:
 340         cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
 341
 342         /* hipersocket busy condition */
 343         if (unlikely(*busy_bit)) {
 344                 retries++;
 345
 346                 if (!start_time) {
 347                         start_time = get_tod_clock_fast();
 348                         goto again;
 349                 }
 350                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 351                         goto again;
 352         }
 353         if (retries) {
 354                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 355                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 356                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 357         }
 358         return cc;
 359 }
 360
 361 static inline int qdio_siga_input(struct qdio_q *q)
 362 {
 363         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 364         unsigned int fc = QDIO_SIGA_READ;
 365         int cc;
 366
 367         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 368         qperf_inc(q, siga_read);
 369
 370         if (is_qebsm(q)) {
 371                 schid = q->irq_ptr->sch_token;
 372                 fc |= QDIO_SIGA_QEBSM_FLAG;
 373         }
 374
 375         cc = do_siga_input(schid, q->mask, fc);
 376         if (unlikely(cc))
 377                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 378         return (cc) ? -EIO : 0;
 379 }
 380
 381 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 382 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 383
 384 static inline void qdio_sync_queues(struct qdio_q *q)
 385 {
 386         /* PCI capable outbound queues will also be scanned so sync them too */
 387         if (pci_out_supported(q->irq_ptr))
 388                 qdio_siga_sync_all(q);
 389         else
 390                 qdio_siga_sync_q(q);
 391 }
 392
 393 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 394                         unsigned char *state)
 395 {
 396         if (need_siga_sync(q))
 397                 qdio_siga_sync_q(q);
 398         return get_buf_state(q, bufnr, state, 0);
 399 }
 400
 401 static inline void qdio_stop_polling(struct qdio_q *q)
 402 {
 403         if (!q->u.in.batch_count)
 404                 return;
 405
 406         qperf_inc(q, stop_polling);
 407
 408         /* show the card that we are not polling anymore */
 409         set_buf_states(q, q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT,
 410                        q->u.in.batch_count);
 411         q->u.in.batch_count = 0;
 412 }
 413
 414 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 415 {
 416         q->q_stats.nr_sbal_total += count;
 417         q->q_stats.nr_sbals[ilog2(count)]++;
 418 }
 419
 420 static void process_buffer_error(struct qdio_q *q, unsigned int start,
 421                                  int count)
 422 {
 423         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 424
 425         /* special handling for no target buffer empty */
 426         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 427             q->sbal[start]->element[15].sflags == 0x10) {
 428                 qperf_inc(q, target_full);
 429                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
 430                 return;
 431         }
 432
 433         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 434         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 435         DBF_ERROR("FTC:%3d C:%3d", start, count);
 436         DBF_ERROR("F14:%2x F15:%2x",
 437                   q->sbal[start]->element[14].sflags,
 438                   q->sbal[start]->element[15].sflags);
 439 }
 440
 441 static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
 442                                        int count, bool auto_ack)
 443 {
 444         /* ACK the newest SBAL: */
 445         if (!auto_ack)
 446                 set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK);
 447
 448         if (!q->u.in.batch_count)
 449                 q->u.in.batch_start = start;
 450         q->u.in.batch_count += count;
 451 }
 452
 453 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 454 {
 455         unsigned char state = 0;
 456         int count;
 457
 458         q->timestamp = get_tod_clock_fast();
 459
 460         count = atomic_read(&q->nr_buf_used);
 461         if (!count)
 462                 return 0;
 463
 464         /*
 465          * No siga sync here, as a PCI or we after a thin interrupt
 466          * already sync'ed the queues.
 467          */
 468         count = get_buf_states(q, start, &state, count, 1, 0);
 469         if (!count)
 470                 return 0;
 471
 472         switch (state) {
 473         case SLSB_P_INPUT_PRIMED:
 474                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
 475                               count);
 476
 477                 inbound_handle_work(q, start, count, is_qebsm(q));
 478                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 479                         qperf_inc(q, inbound_queue_full);
 480                 if (q->irq_ptr->perf_stat_enabled)
 481                         account_sbals(q, count);
 482                 return count;
 483         case SLSB_P_INPUT_ERROR:
 484                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
 485                               count);
 486
 487                 process_buffer_error(q, start, count);
 488                 inbound_handle_work(q, start, count, false);
 489                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 490                         qperf_inc(q, inbound_queue_full);
 491                 if (q->irq_ptr->perf_stat_enabled)
 492                         account_sbals_error(q, count);
 493                 return count;
 494         case SLSB_CU_INPUT_EMPTY:
 495                 if (q->irq_ptr->perf_stat_enabled)
 496                         q->q_stats.nr_sbal_nop++;
 497                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 498                               q->nr, start);
 499                 return 0;
 500         case SLSB_P_INPUT_NOT_INIT:
 501         case SLSB_P_INPUT_ACK:
 502                 /* We should never see this state, throw a WARN: */
 503         default:
 504                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 505                               "found state %#x at index %u on queue %u\n",
 506                               state, start, q->nr);
 507                 return 0;
 508         }
 509 }
 510
 511 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start)
 512 {
 513         return get_inbound_buffer_frontier(q, start);
 514 }
 515
 516 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 517 {
 518         unsigned char state = 0;
 519
 520         if (!atomic_read(&q->nr_buf_used))
 521                 return 1;
 522
 523         if (need_siga_sync(q))
 524                 qdio_siga_sync_q(q);
 525         get_buf_state(q, start, &state, 0);
 526
 527         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 528                 /* more work coming */
 529                 return 0;
 530
 531         return 1;
 532 }
 533
 534 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 535 {
 536         unsigned char state = 0;
 537         int j, b = start;
 538
 539         for (j = 0; j < count; ++j) {
 540                 get_buf_state(q, b, &state, 0);
 541                 if (state == SLSB_P_OUTPUT_PENDING) {
 542                         struct qaob *aob = q->u.out.aobs[b];
 543                         if (aob == NULL)
 544                                 continue;
 545
 546                         q->u.out.sbal_state[b].flags |=
 547                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 548                         q->u.out.aobs[b] = NULL;
 549                 }
 550                 b = next_buf(b);
 551         }
 552 }
 553
 554 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 555                                         int bufnr)
 556 {
 557         unsigned long phys_aob = 0;
 558
 559         if (!q->aobs[bufnr]) {
 560                 struct qaob *aob = qdio_allocate_aob();
 561                 q->aobs[bufnr] = aob;
 562         }
 563         if (q->aobs[bufnr]) {
 564                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 565                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 566                 WARN_ON_ONCE(phys_aob & 0xFF);
 567         }
 568
 569         q->sbal_state[bufnr].flags = 0;
 570         return phys_aob;
 571 }
 572
 573 static void qdio_kick_handler(struct qdio_q *q, unsigned int start,
 574                               unsigned int count)
 575 {
 576         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 577                 return;
 578
 579         if (q->is_input_q) {
 580                 qperf_inc(q, inbound_handler);
 581                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 582         } else {
 583                 qperf_inc(q, outbound_handler);
 584                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 585                               start, count);
 586         }
 587
 588         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 589                    q->irq_ptr->int_parm);
 590
 591         /* for the next time */
 592         q->qdio_error = 0;
 593 }
 594
 595 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 596 {
 597         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 598                 tasklet_schedule(&q->tasklet);
 599                 return 0;
 600         }
 601         return -EPERM;
 602 }
 603
 604 static void __qdio_inbound_processing(struct qdio_q *q)
 605 {
 606         unsigned int start = q->first_to_check;
 607         int count;
 608
 609         qperf_inc(q, tasklet_inbound);
 610
 611         count = qdio_inbound_q_moved(q, start);
 612         if (count == 0)
 613                 return;
 614
 615         qdio_kick_handler(q, start, count);
 616         start = add_buf(start, count);
 617         q->first_to_check = start;
 618
 619         if (!qdio_inbound_q_done(q, start)) {
 620                 /* means poll time is not yet over */
 621                 qperf_inc(q, tasklet_inbound_resched);
 622                 if (!qdio_tasklet_schedule(q))
 623                         return;
 624         }
 625
 626         qdio_stop_polling(q);
 627         /*
 628          * We need to check again to not lose initiative after
 629          * resetting the ACK state.
 630          */
 631         if (!qdio_inbound_q_done(q, start)) {
 632                 qperf_inc(q, tasklet_inbound_resched2);
 633                 qdio_tasklet_schedule(q);
 634         }
 635 }
 636
 637 void qdio_inbound_processing(unsigned long data)
 638 {
 639         struct qdio_q *q = (struct qdio_q *)data;
 640         __qdio_inbound_processing(q);
 641 }
 642
 643 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 644 {
 645         unsigned char state = 0;
 646         int count;
 647
 648         q->timestamp = get_tod_clock_fast();
 649
 650         if (need_siga_sync(q))
 651                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 652                     !pci_out_supported(q->irq_ptr)) ||
 653                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 654                     multicast_outbound(q)))
 655                         qdio_siga_sync_q(q);
 656
 657         count = atomic_read(&q->nr_buf_used);
 658         if (!count)
 659                 return 0;
 660
 661         count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
 662         if (!count)
 663                 return 0;
 664
 665         switch (state) {
 666         case SLSB_P_OUTPUT_EMPTY:
 667         case SLSB_P_OUTPUT_PENDING:
 668                 /* the adapter got it */
 669                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 670                         "out empty:%1d %02x", q->nr, count);
 671
 672                 atomic_sub(count, &q->nr_buf_used);
 673                 if (q->irq_ptr->perf_stat_enabled)
 674                         account_sbals(q, count);
 675                 return count;
 676         case SLSB_P_OUTPUT_ERROR:
 677                 process_buffer_error(q, start, count);
 678                 atomic_sub(count, &q->nr_buf_used);
 679                 if (q->irq_ptr->perf_stat_enabled)
 680                         account_sbals_error(q, count);
 681                 return count;
 682         case SLSB_CU_OUTPUT_PRIMED:
 683                 /* the adapter has not fetched the output yet */
 684                 if (q->irq_ptr->perf_stat_enabled)
 685                         q->q_stats.nr_sbal_nop++;
 686                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 687                               q->nr);
 688                 return 0;
 689         case SLSB_P_OUTPUT_HALTED:
 690                 return 0;
 691         case SLSB_P_OUTPUT_NOT_INIT:
 692                 /* We should never see this state, throw a WARN: */
 693         default:
 694                 dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
 695                               "found state %#x at index %u on queue %u\n",
 696                               state, start, q->nr);
 697                 return 0;
 698         }
 699 }
 700
 701 /* all buffers processed? */
 702 static inline int qdio_outbound_q_done(struct qdio_q *q)
 703 {
 704         return atomic_read(&q->nr_buf_used) == 0;
 705 }
 706
 707 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
 708 {
 709         int count;
 710
 711         count = get_outbound_buffer_frontier(q, start);
 712
 713         if (count) {
 714                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 715                 if (q->u.out.use_cq)
 716                         qdio_handle_aobs(q, start, count);
 717         }
 718
 719         return count;
 720 }
 721
 722 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 723                                 unsigned long aob)
 724 {
 725         int retries = 0, cc;
 726         unsigned int busy_bit;
 727
 728         if (!need_siga_out(q))
 729                 return 0;
 730
 731         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 732 retry:
 733         qperf_inc(q, siga_write);
 734
 735         cc = qdio_siga_output(q, count, &busy_bit, aob);
 736         switch (cc) {
 737         case 0:
 738                 break;
 739         case 2:
 740                 if (busy_bit) {
 741                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 742                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 743                                 goto retry;
 744                         }
 745                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 746                         cc = -EBUSY;
 747                 } else {
 748                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 749                         cc = -ENOBUFS;
 750                 }
 751                 break;
 752         case 1:
 753         case 3:
 754                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 755                 cc = -EIO;
 756                 break;
 757         }
 758         if (retries) {
 759                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 760                 DBF_ERROR("count:%u", retries);
 761         }
 762         return cc;
 763 }
 764
 765 static void __qdio_outbound_processing(struct qdio_q *q)
 766 {
 767         unsigned int start = q->first_to_check;
 768         int count;
 769
 770         qperf_inc(q, tasklet_outbound);
 771         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 772
 773         count = qdio_outbound_q_moved(q, start);
 774         if (count) {
 775                 q->first_to_check = add_buf(start, count);
 776                 qdio_kick_handler(q, start, count);
 777         }
 778
 779         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 780             !qdio_outbound_q_done(q))
 781                 goto sched;
 782
 783         if (q->u.out.pci_out_enabled)
 784                 return;
 785
 786         /*
 787          * Now we know that queue type is either qeth without pci enabled
 788          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 789          * is noticed and outbound_handler is called after some time.
 790          */
 791         if (qdio_outbound_q_done(q))
 792                 del_timer_sync(&q->u.out.timer);
 793         else
 794                 if (!timer_pending(&q->u.out.timer) &&
 795                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 796                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 797         return;
 798
 799 sched:
 800         qdio_tasklet_schedule(q);
 801 }
 802
 803 /* outbound tasklet */
 804 void qdio_outbound_processing(unsigned long data)
 805 {
 806         struct qdio_q *q = (struct qdio_q *)data;
 807         __qdio_outbound_processing(q);
 808 }
 809
 810 void qdio_outbound_timer(struct timer_list *t)
 811 {
 812         struct qdio_q *q = from_timer(q, t, u.out.timer);
 813
 814         qdio_tasklet_schedule(q);
 815 }
 816
 817 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 818 {
 819         struct qdio_q *out;
 820         int i;
 821
 822         if (!pci_out_supported(irq) || !irq->scan_threshold)
 823                 return;
 824
 825         for_each_output_queue(irq, out, i)
 826                 if (!qdio_outbound_q_done(out))
 827                         qdio_tasklet_schedule(out);
 828 }
 829
 830 void tiqdio_inbound_processing(unsigned long data)
 831 {
 832         struct qdio_q *q = (struct qdio_q *)data;
 833
 834         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 835                 qdio_sync_queues(q);
 836
 837         /* The interrupt could be caused by a PCI request: */
 838         qdio_check_outbound_pci_queues(q->irq_ptr);
 839
 840         __qdio_inbound_processing(q);
 841 }
 842
 843 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 844                                   enum qdio_irq_states state)
 845 {
 846         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 847
 848         irq_ptr->state = state;
 849         mb();
 850 }
 851
 852 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 853 {
 854         if (irb->esw.esw0.erw.cons) {
 855                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 856                 DBF_ERROR_HEX(irb, 64);
 857                 DBF_ERROR_HEX(irb->ecw, 64);
 858         }
 859 }
 860
 861 /* PCI interrupt handler */
 862 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 863 {
 864         int i;
 865         struct qdio_q *q;
 866
 867         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 868                 return;
 869
 870         if (irq_ptr->irq_poll) {
 871                 if (!test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
 872                         irq_ptr->irq_poll(irq_ptr->cdev, irq_ptr->int_parm);
 873                 else
 874                         QDIO_PERF_STAT_INC(irq_ptr, int_discarded);
 875         } else {
 876                 for_each_input_queue(irq_ptr, q, i)
 877                         tasklet_schedule(&q->tasklet);
 878         }
 879
 880         if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold)
 881                 return;
 882
 883         for_each_output_queue(irq_ptr, q, i) {
 884                 if (qdio_outbound_q_done(q))
 885                         continue;
 886                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 887                         qdio_siga_sync_q(q);
 888                 qdio_tasklet_schedule(q);
 889         }
 890 }
 891
 892 static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
 893                                        unsigned long intparm, int cstat,
 894                                        int dstat)
 895 {
 896         struct qdio_q *q;
 897
 898         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 899         DBF_ERROR("intp :%lx", intparm);
 900         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 901
 902         if (irq_ptr->nr_input_qs) {
 903                 q = irq_ptr->input_qs[0];
 904         } else if (irq_ptr->nr_output_qs) {
 905                 q = irq_ptr->output_qs[0];
 906         } else {
 907                 dump_stack();
 908                 goto no_handler;
 909         }
 910
 911         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
 912                    q->nr, q->first_to_check, 0, irq_ptr->int_parm);
 913 no_handler:
 914         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 915         /*
 916          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
 917          * Therefore we call the LGR detection function here.
 918          */
 919         lgr_info_log();
 920 }
 921
 922 static void qdio_establish_handle_irq(struct qdio_irq *irq_ptr, int cstat,
 923                                       int dstat)
 924 {
 925         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
 926
 927         if (cstat)
 928                 goto error;
 929         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
 930                 goto error;
 931         if (!(dstat & DEV_STAT_DEV_END))
 932                 goto error;
 933         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
 934         return;
 935
 936 error:
 937         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
 938         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 939         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 940 }
 941
 942 /* qdio interrupt handler */
 943 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
 944                       struct irb *irb)
 945 {
 946         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 947         struct subchannel_id schid;
 948         int cstat, dstat;
 949
 950         if (!intparm || !irq_ptr) {
 951                 ccw_device_get_schid(cdev, &schid);
 952                 DBF_ERROR("qint:%4x", schid.sch_no);
 953                 return;
 954         }
 955
 956         if (irq_ptr->perf_stat_enabled)
 957                 irq_ptr->perf_stat.qdio_int++;
 958
 959         if (IS_ERR(irb)) {
 960                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
 961                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 962                 wake_up(&cdev->private->wait_q);
 963                 return;
 964         }
 965         qdio_irq_check_sense(irq_ptr, irb);
 966         cstat = irb->scsw.cmd.cstat;
 967         dstat = irb->scsw.cmd.dstat;
 968
 969         switch (irq_ptr->state) {
 970         case QDIO_IRQ_STATE_INACTIVE:
 971                 qdio_establish_handle_irq(irq_ptr, cstat, dstat);
 972                 break;
 973         case QDIO_IRQ_STATE_CLEANUP:
 974                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
 975                 break;
 976         case QDIO_IRQ_STATE_ESTABLISHED:
 977         case QDIO_IRQ_STATE_ACTIVE:
 978                 if (cstat & SCHN_STAT_PCI) {
 979                         qdio_int_handler_pci(irq_ptr);
 980                         return;
 981                 }
 982                 if (cstat || dstat)
 983                         qdio_handle_activate_check(irq_ptr, intparm, cstat,
 984                                                    dstat);
 985                 break;
 986         case QDIO_IRQ_STATE_STOPPED:
 987                 break;
 988         default:
 989                 WARN_ON_ONCE(1);
 990         }
 991         wake_up(&cdev->private->wait_q);
 992 }
 993
 994 /**
 995  * qdio_get_ssqd_desc - get qdio subchannel description
 996  * @cdev: ccw device to get description for
 997  * @data: where to store the ssqd
 998  *
 999  * Returns 0 or an error code. The results of the chsc are stored in the
1000  * specified structure.
1001  */
1002 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1003                        struct qdio_ssqd_desc *data)
1004 {
1005         struct subchannel_id schid;
1006
1007         if (!cdev || !cdev->private)
1008                 return -EINVAL;
1009
1010         ccw_device_get_schid(cdev, &schid);
1011         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1012         return qdio_setup_get_ssqd(NULL, &schid, data);
1013 }
1014 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1015
1016 static void qdio_shutdown_queues(struct qdio_irq *irq_ptr)
1017 {
1018         struct qdio_q *q;
1019         int i;
1020
1021         for_each_input_queue(irq_ptr, q, i)
1022                 tasklet_kill(&q->tasklet);
1023
1024         for_each_output_queue(irq_ptr, q, i) {
1025                 del_timer_sync(&q->u.out.timer);
1026                 tasklet_kill(&q->tasklet);
1027         }
1028 }
1029
1030 /**
1031  * qdio_shutdown - shut down a qdio subchannel
1032  * @cdev: associated ccw device
1033  * @how: use halt or clear to shutdown
1034  */
1035 int qdio_shutdown(struct ccw_device *cdev, int how)
1036 {
1037         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1038         struct subchannel_id schid;
1039         int rc;
1040
1041         if (!irq_ptr)
1042                 return -ENODEV;
1043
1044         WARN_ON_ONCE(irqs_disabled());
1045         ccw_device_get_schid(cdev, &schid);
1046         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1047
1048         mutex_lock(&irq_ptr->setup_mutex);
1049         /*
1050          * Subchannel was already shot down. We cannot prevent being called
1051          * twice since cio may trigger a shutdown asynchronously.
1052          */
1053         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1054                 mutex_unlock(&irq_ptr->setup_mutex);
1055                 return 0;
1056         }
1057
1058         /*
1059          * Indicate that the device is going down. Scheduling the queue
1060          * tasklets is forbidden from here on.
1061          */
1062         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1063
1064         tiqdio_remove_device(irq_ptr);
1065         qdio_shutdown_queues(irq_ptr);
1066         qdio_shutdown_debug_entries(irq_ptr);
1067
1068         /* cleanup subchannel */
1069         spin_lock_irq(get_ccwdev_lock(cdev));
1070         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1071         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1072                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1073         else
1074                 /* default behaviour is halt */
1075                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1076         spin_unlock_irq(get_ccwdev_lock(cdev));
1077         if (rc) {
1078                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1079                 DBF_ERROR("rc:%4d", rc);
1080                 goto no_cleanup;
1081         }
1082
1083         wait_event_interruptible_timeout(cdev->private->wait_q,
1084                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1085                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1086                 10 * HZ);
1087
1088 no_cleanup:
1089         qdio_shutdown_thinint(irq_ptr);
1090         qdio_shutdown_irq(irq_ptr);
1091
1092         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1093         mutex_unlock(&irq_ptr->setup_mutex);
1094         if (rc)
1095                 return rc;
1096         return 0;
1097 }
1098 EXPORT_SYMBOL_GPL(qdio_shutdown);
1099
1100 /**
1101  * qdio_free - free data structures for a qdio subchannel
1102  * @cdev: associated ccw device
1103  */
1104 int qdio_free(struct ccw_device *cdev)
1105 {
1106         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1107         struct subchannel_id schid;
1108
1109         if (!irq_ptr)
1110                 return -ENODEV;
1111
1112         ccw_device_get_schid(cdev, &schid);
1113         DBF_EVENT("qfree:%4x", schid.sch_no);
1114         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1115         mutex_lock(&irq_ptr->setup_mutex);
1116
1117         irq_ptr->debug_area = NULL;
1118         cdev->private->qdio_data = NULL;
1119         mutex_unlock(&irq_ptr->setup_mutex);
1120
1121         qdio_free_async_data(irq_ptr);
1122         qdio_free_queues(irq_ptr);
1123         free_page((unsigned long) irq_ptr->qdr);
1124         free_page(irq_ptr->chsc_page);
1125         free_page((unsigned long) irq_ptr);
1126         return 0;
1127 }
1128 EXPORT_SYMBOL_GPL(qdio_free);
1129
1130 /**
1131  * qdio_allocate - allocate qdio queues and associated data
1132  * @cdev: associated ccw device
1133  * @no_input_qs: allocate this number of Input Queues
1134  * @no_output_qs: allocate this number of Output Queues
1135  */
1136 int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
1137                   unsigned int no_output_qs)
1138 {
1139         struct subchannel_id schid;
1140         struct qdio_irq *irq_ptr;
1141         int rc = -ENOMEM;
1142
1143         ccw_device_get_schid(cdev, &schid);
1144         DBF_EVENT("qallocate:%4x", schid.sch_no);
1145
1146         if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
1147             no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
1148                 return -EINVAL;
1149
1150         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1151         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1152         if (!irq_ptr)
1153                 return -ENOMEM;
1154
1155         irq_ptr->cdev = cdev;
1156         mutex_init(&irq_ptr->setup_mutex);
1157         if (qdio_allocate_dbf(irq_ptr))
1158                 goto err_dbf;
1159
1160         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
1161                       no_output_qs);
1162
1163         /*
1164          * Allocate a page for the chsc calls in qdio_establish.
1165          * Must be pre-allocated since a zfcp recovery will call
1166          * qdio_establish. In case of low memory and swap on a zfcp disk
1167          * we may not be able to allocate memory otherwise.
1168          */
1169         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1170         if (!irq_ptr->chsc_page)
1171                 goto err_chsc;
1172
1173         /* qdr is used in ccw1.cda which is u32 */
1174         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1175         if (!irq_ptr->qdr)
1176                 goto err_qdr;
1177
1178         rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
1179         if (rc)
1180                 goto err_queues;
1181
1182         INIT_LIST_HEAD(&irq_ptr->entry);
1183         cdev->private->qdio_data = irq_ptr;
1184         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1185         return 0;
1186
1187 err_queues:
1188         free_page((unsigned long) irq_ptr->qdr);
1189 err_qdr:
1190         free_page(irq_ptr->chsc_page);
1191 err_chsc:
1192 err_dbf:
1193         free_page((unsigned long) irq_ptr);
1194         return rc;
1195 }
1196 EXPORT_SYMBOL_GPL(qdio_allocate);
1197
1198 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1199 {
1200         struct qdio_q *q = irq_ptr->input_qs[0];
1201         int i, use_cq = 0;
1202
1203         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1204                 use_cq = 1;
1205
1206         for_each_output_queue(irq_ptr, q, i) {
1207                 if (use_cq) {
1208                         if (multicast_outbound(q))
1209                                 continue;
1210                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1211                                 use_cq = 0;
1212                                 continue;
1213                         }
1214                 } else
1215                         qdio_disable_async_operation(&q->u.out);
1216         }
1217         DBF_EVENT("use_cq:%d", use_cq);
1218 }
1219
1220 static void qdio_trace_init_data(struct qdio_irq *irq,
1221                                  struct qdio_initialize *data)
1222 {
1223         DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
1224         DBF_DEV_HEX(irq, data->adapter_name, 8, DBF_ERR);
1225         DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
1226         DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
1227         DBF_DEV_HEX(irq, &data->input_slib_elements, sizeof(void *), DBF_ERR);
1228         DBF_DEV_HEX(irq, &data->output_slib_elements, sizeof(void *), DBF_ERR);
1229         DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
1230                       data->no_output_qs);
1231         DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
1232         DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
1233         DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
1234         DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
1235         DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
1236                     DBF_ERR);
1237 }
1238
1239 /**
1240  * qdio_establish - establish queues on a qdio subchannel
1241  * @cdev: associated ccw device
1242  * @init_data: initialization data
1243  */
1244 int qdio_establish(struct ccw_device *cdev,
1245                    struct qdio_initialize *init_data)
1246 {
1247         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1248         struct subchannel_id schid;
1249         int rc;
1250
1251         ccw_device_get_schid(cdev, &schid);
1252         DBF_EVENT("qestablish:%4x", schid.sch_no);
1253
1254         if (!irq_ptr)
1255                 return -ENODEV;
1256
1257         if (init_data->no_input_qs > irq_ptr->max_input_qs ||
1258             init_data->no_output_qs > irq_ptr->max_output_qs)
1259                 return -EINVAL;
1260
1261         if ((init_data->no_input_qs && !init_data->input_handler) ||
1262             (init_data->no_output_qs && !init_data->output_handler))
1263                 return -EINVAL;
1264
1265         if (!init_data->input_sbal_addr_array ||
1266             !init_data->output_sbal_addr_array)
1267                 return -EINVAL;
1268
1269         mutex_lock(&irq_ptr->setup_mutex);
1270         qdio_trace_init_data(irq_ptr, init_data);
1271         qdio_setup_irq(irq_ptr, init_data);
1272
1273         rc = qdio_establish_thinint(irq_ptr);
1274         if (rc) {
1275                 qdio_shutdown_irq(irq_ptr);
1276                 mutex_unlock(&irq_ptr->setup_mutex);
1277                 return rc;
1278         }
1279
1280         /* establish q */
1281         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1282         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1283         irq_ptr->ccw.count = irq_ptr->equeue.count;
1284         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1285
1286         spin_lock_irq(get_ccwdev_lock(cdev));
1287         ccw_device_set_options_mask(cdev, 0);
1288
1289         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1290         spin_unlock_irq(get_ccwdev_lock(cdev));
1291         if (rc) {
1292                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1293                 DBF_ERROR("rc:%4x", rc);
1294                 qdio_shutdown_thinint(irq_ptr);
1295                 qdio_shutdown_irq(irq_ptr);
1296                 mutex_unlock(&irq_ptr->setup_mutex);
1297                 return rc;
1298         }
1299
1300         wait_event_interruptible_timeout(cdev->private->wait_q,
1301                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1302                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1303
1304         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1305                 mutex_unlock(&irq_ptr->setup_mutex);
1306                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1307                 return -EIO;
1308         }
1309
1310         qdio_setup_ssqd_info(irq_ptr);
1311
1312         qdio_detect_hsicq(irq_ptr);
1313
1314         /* qebsm is now setup if available, initialize buffer states */
1315         qdio_init_buf_states(irq_ptr);
1316
1317         mutex_unlock(&irq_ptr->setup_mutex);
1318         qdio_print_subchannel_info(irq_ptr);
1319         qdio_setup_debug_entries(irq_ptr);
1320         return 0;
1321 }
1322 EXPORT_SYMBOL_GPL(qdio_establish);
1323
1324 /**
1325  * qdio_activate - activate queues on a qdio subchannel
1326  * @cdev: associated cdev
1327  */
1328 int qdio_activate(struct ccw_device *cdev)
1329 {
1330         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1331         struct subchannel_id schid;
1332         int rc;
1333
1334         ccw_device_get_schid(cdev, &schid);
1335         DBF_EVENT("qactivate:%4x", schid.sch_no);
1336
1337         if (!irq_ptr)
1338                 return -ENODEV;
1339
1340         mutex_lock(&irq_ptr->setup_mutex);
1341         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1342                 rc = -EBUSY;
1343                 goto out;
1344         }
1345
1346         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1347         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1348         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1349         irq_ptr->ccw.cda = 0;
1350
1351         spin_lock_irq(get_ccwdev_lock(cdev));
1352         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1353
1354         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1355                               0, DOIO_DENY_PREFETCH);
1356         spin_unlock_irq(get_ccwdev_lock(cdev));
1357         if (rc) {
1358                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1359                 DBF_ERROR("rc:%4x", rc);
1360                 goto out;
1361         }
1362
1363         if (is_thinint_irq(irq_ptr))
1364                 tiqdio_add_device(irq_ptr);
1365
1366         /* wait for subchannel to become active */
1367         msleep(5);
1368
1369         switch (irq_ptr->state) {
1370         case QDIO_IRQ_STATE_STOPPED:
1371         case QDIO_IRQ_STATE_ERR:
1372                 rc = -EIO;
1373                 break;
1374         default:
1375                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1376                 rc = 0;
1377         }
1378 out:
1379         mutex_unlock(&irq_ptr->setup_mutex);
1380         return rc;
1381 }
1382 EXPORT_SYMBOL_GPL(qdio_activate);
1383
1384 /**
1385  * handle_inbound - reset processed input buffers
1386  * @q: queue containing the buffers
1387  * @callflags: flags
1388  * @bufnr: first buffer to process
1389  * @count: how many buffers are emptied
1390  */
1391 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1392                           int bufnr, int count)
1393 {
1394         int overlap;
1395
1396         qperf_inc(q, inbound_call);
1397
1398         /* If any processed SBALs are returned to HW, adjust our tracking: */
1399         overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
1400                              q->u.in.batch_count);
1401         if (overlap > 0) {
1402                 q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
1403                 q->u.in.batch_count -= overlap;
1404         }
1405
1406         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1407         atomic_add(count, &q->nr_buf_used);
1408
1409         if (need_siga_in(q))
1410                 return qdio_siga_input(q);
1411
1412         return 0;
1413 }
1414
1415 /**
1416  * handle_outbound - process filled outbound buffers
1417  * @q: queue containing the buffers
1418  * @callflags: flags
1419  * @bufnr: first buffer to process
1420  * @count: how many buffers are filled
1421  */
1422 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1423                            unsigned int bufnr, unsigned int count)
1424 {
1425         const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
1426         unsigned char state = 0;
1427         int used, rc = 0;
1428
1429         qperf_inc(q, outbound_call);
1430
1431         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1432         used = atomic_add_return(count, &q->nr_buf_used);
1433
1434         if (used == QDIO_MAX_BUFFERS_PER_Q)
1435                 qperf_inc(q, outbound_queue_full);
1436
1437         if (callflags & QDIO_FLAG_PCI_OUT) {
1438                 q->u.out.pci_out_enabled = 1;
1439                 qperf_inc(q, pci_request_int);
1440         } else
1441                 q->u.out.pci_out_enabled = 0;
1442
1443         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1444                 unsigned long phys_aob = 0;
1445
1446                 if (q->u.out.use_cq && count == 1)
1447                         phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1448
1449                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1450         } else if (need_siga_sync(q)) {
1451                 rc = qdio_siga_sync_q(q);
1452         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1453                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1454                    state == SLSB_CU_OUTPUT_PRIMED) {
1455                 /* The previous buffer is not processed yet, tack on. */
1456                 qperf_inc(q, fast_requeue);
1457         } else {
1458                 rc = qdio_kick_outbound_q(q, count, 0);
1459         }
1460
1461         /* Let drivers implement their own completion scanning: */
1462         if (!scan_threshold)
1463                 return rc;
1464
1465         /* in case of SIGA errors we must process the error immediately */
1466         if (used >= scan_threshold || rc)
1467                 qdio_tasklet_schedule(q);
1468         else
1469                 /* free the SBALs in case of no further traffic */
1470                 if (!timer_pending(&q->u.out.timer) &&
1471                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1472                         mod_timer(&q->u.out.timer, jiffies + HZ);
1473         return rc;
1474 }
1475
1476 /**
1477  * do_QDIO - process input or output buffers
1478  * @cdev: associated ccw_device for the qdio subchannel
1479  * @callflags: input or output and special flags from the program
1480  * @q_nr: queue number
1481  * @bufnr: buffer number
1482  * @count: how many buffers to process
1483  */
1484 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1485             int q_nr, unsigned int bufnr, unsigned int count)
1486 {
1487         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1488
1489         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1490                 return -EINVAL;
1491
1492         if (!irq_ptr)
1493                 return -ENODEV;
1494
1495         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1496                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1497
1498         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1499                 return -EIO;
1500         if (!count)
1501                 return 0;
1502         if (callflags & QDIO_FLAG_SYNC_INPUT)
1503                 return handle_inbound(irq_ptr->input_qs[q_nr],
1504                                       callflags, bufnr, count);
1505         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1506                 return handle_outbound(irq_ptr->output_qs[q_nr],
1507                                        callflags, bufnr, count);
1508         return -EINVAL;
1509 }
1510 EXPORT_SYMBOL_GPL(do_QDIO);
1511
1512 /**
1513  * qdio_start_irq - enable interrupt processing for the device
1514  * @cdev: associated ccw_device for the qdio subchannel
1515  *
1516  * Return codes
1517  *   0 - success
1518  *   1 - irqs not started since new data is available
1519  */
1520 int qdio_start_irq(struct ccw_device *cdev)
1521 {
1522         struct qdio_q *q;
1523         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1524         unsigned int i;
1525
1526         if (!irq_ptr)
1527                 return -ENODEV;
1528
1529         for_each_input_queue(irq_ptr, q, i)
1530                 qdio_stop_polling(q);
1531
1532         clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
1533
1534         /*
1535          * We need to check again to not lose initiative after
1536          * resetting the ACK state.
1537          */
1538         if (test_nonshared_ind(irq_ptr))
1539                 goto rescan;
1540
1541         for_each_input_queue(irq_ptr, q, i) {
1542                 if (!qdio_inbound_q_done(q, q->first_to_check))
1543                         goto rescan;
1544         }
1545
1546         return 0;
1547
1548 rescan:
1549         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1550                 return 0;
1551         else
1552                 return 1;
1553
1554 }
1555 EXPORT_SYMBOL(qdio_start_irq);
1556
1557 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
1558                                 unsigned int *error)
1559 {
1560         unsigned int start = q->first_to_check;
1561         int count;
1562
1563         count = q->is_input_q ? qdio_inbound_q_moved(q, start) :
1564                                 qdio_outbound_q_moved(q, start);
1565         if (count == 0)
1566                 return 0;
1567
1568         *bufnr = start;
1569         *error = q->qdio_error;
1570
1571         /* for the next time */
1572         q->first_to_check = add_buf(start, count);
1573         q->qdio_error = 0;
1574
1575         return count;
1576 }
1577
1578 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
1579                        unsigned int *bufnr, unsigned int *error)
1580 {
1581         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1582         struct qdio_q *q;
1583
1584         if (!irq_ptr)
1585                 return -ENODEV;
1586         q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
1587
1588         if (need_siga_sync(q))
1589                 qdio_siga_sync_q(q);
1590
1591         return __qdio_inspect_queue(q, bufnr, error);
1592 }
1593 EXPORT_SYMBOL_GPL(qdio_inspect_queue);
1594
1595 /**
1596  * qdio_get_next_buffers - process input buffers
1597  * @cdev: associated ccw_device for the qdio subchannel
1598  * @nr: input queue number
1599  * @bufnr: first filled buffer number
1600  * @error: buffers are in error state
1601  *
1602  * Return codes
1603  *   < 0 - error
1604  *   = 0 - no new buffers found
1605  *   > 0 - number of processed buffers
1606  */
1607 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1608                           int *error)
1609 {
1610         struct qdio_q *q;
1611         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1612
1613         if (!irq_ptr)
1614                 return -ENODEV;
1615         q = irq_ptr->input_qs[nr];
1616
1617         /*
1618          * Cannot rely on automatic sync after interrupt since queues may
1619          * also be examined without interrupt.
1620          */
1621         if (need_siga_sync(q))
1622                 qdio_sync_queues(q);
1623
1624         qdio_check_outbound_pci_queues(irq_ptr);
1625
1626         /* Note: upper-layer MUST stop processing immediately here ... */
1627         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1628                 return -EIO;
1629
1630         return __qdio_inspect_queue(q, bufnr, error);
1631 }
1632 EXPORT_SYMBOL(qdio_get_next_buffers);
1633
1634 /**
1635  * qdio_stop_irq - disable interrupt processing for the device
1636  * @cdev: associated ccw_device for the qdio subchannel
1637  *
1638  * Return codes
1639  *   0 - interrupts were already disabled
1640  *   1 - interrupts successfully disabled
1641  */
1642 int qdio_stop_irq(struct ccw_device *cdev)
1643 {
1644         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1645
1646         if (!irq_ptr)
1647                 return -ENODEV;
1648
1649         if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
1650                 return 0;
1651         else
1652                 return 1;
1653 }
1654 EXPORT_SYMBOL(qdio_stop_irq);
1655
1656 static int __init init_QDIO(void)
1657 {
1658         int rc;
1659
1660         rc = qdio_debug_init();
1661         if (rc)
1662                 return rc;
1663         rc = qdio_setup_init();
1664         if (rc)
1665                 goto out_debug;
1666         rc = qdio_thinint_init();
1667         if (rc)
1668                 goto out_cache;
1669         return 0;
1670
1671 out_cache:
1672         qdio_setup_exit();
1673 out_debug:
1674         qdio_debug_exit();
1675         return rc;
1676 }
1677
1678 static void __exit exit_QDIO(void)
1679 {
1680         qdio_thinint_exit();
1681         qdio_setup_exit();
1682         qdio_debug_exit();
1683 }
1684
1685 module_init(init_QDIO);
1686 module_exit(exit_QDIO);