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_WARN, 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_kick, 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_kick, 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         for (i = 0; i < count; i++) {
 258                 xchg(&q->slsb.val[bufnr], state);
 259                 bufnr = next_buf(bufnr);
 260         }
 261         return count;
 262 }
 263
 264 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 265                                 unsigned char state)
 266 {
 267         return set_buf_states(q, bufnr, state, 1);
 268 }
 269
 270 /* set slsb states to initial state */
 271 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 272 {
 273         struct qdio_q *q;
 274         int i;
 275
 276         for_each_input_queue(irq_ptr, q, i)
 277                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 278                                QDIO_MAX_BUFFERS_PER_Q);
 279         for_each_output_queue(irq_ptr, q, i)
 280                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 281                                QDIO_MAX_BUFFERS_PER_Q);
 282 }
 283
 284 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 285                           unsigned int input)
 286 {
 287         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 288         unsigned int fc = QDIO_SIGA_SYNC;
 289         int cc;
 290
 291         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 292         qperf_inc(q, siga_sync);
 293
 294         if (is_qebsm(q)) {
 295                 schid = q->irq_ptr->sch_token;
 296                 fc |= QDIO_SIGA_QEBSM_FLAG;
 297         }
 298
 299         cc = do_siga_sync(schid, output, input, fc);
 300         if (unlikely(cc))
 301                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 302         return (cc) ? -EIO : 0;
 303 }
 304
 305 static inline int qdio_siga_sync_q(struct qdio_q *q)
 306 {
 307         if (q->is_input_q)
 308                 return qdio_siga_sync(q, 0, q->mask);
 309         else
 310                 return qdio_siga_sync(q, q->mask, 0);
 311 }
 312
 313 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
 314         unsigned long aob)
 315 {
 316         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 317         unsigned int fc = QDIO_SIGA_WRITE;
 318         u64 start_time = 0;
 319         int retries = 0, cc;
 320         unsigned long laob = 0;
 321
 322         WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
 323                              !q->u.out.use_cq));
 324         if (q->u.out.use_cq && aob != 0) {
 325                 fc = QDIO_SIGA_WRITEQ;
 326                 laob = aob;
 327         }
 328
 329         if (is_qebsm(q)) {
 330                 schid = q->irq_ptr->sch_token;
 331                 fc |= QDIO_SIGA_QEBSM_FLAG;
 332         }
 333 again:
 334         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
 335
 336         /* hipersocket busy condition */
 337         if (unlikely(*busy_bit)) {
 338                 retries++;
 339
 340                 if (!start_time) {
 341                         start_time = get_tod_clock_fast();
 342                         goto again;
 343                 }
 344                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 345                         goto again;
 346         }
 347         if (retries) {
 348                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 349                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 350                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 351         }
 352         return cc;
 353 }
 354
 355 static inline int qdio_siga_input(struct qdio_q *q)
 356 {
 357         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 358         unsigned int fc = QDIO_SIGA_READ;
 359         int cc;
 360
 361         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 362         qperf_inc(q, siga_read);
 363
 364         if (is_qebsm(q)) {
 365                 schid = q->irq_ptr->sch_token;
 366                 fc |= QDIO_SIGA_QEBSM_FLAG;
 367         }
 368
 369         cc = do_siga_input(schid, q->mask, fc);
 370         if (unlikely(cc))
 371                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 372         return (cc) ? -EIO : 0;
 373 }
 374
 375 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 376 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 377
 378 static inline void qdio_sync_queues(struct qdio_q *q)
 379 {
 380         /* PCI capable outbound queues will also be scanned so sync them too */
 381         if (pci_out_supported(q->irq_ptr))
 382                 qdio_siga_sync_all(q);
 383         else
 384                 qdio_siga_sync_q(q);
 385 }
 386
 387 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 388                         unsigned char *state)
 389 {
 390         if (need_siga_sync(q))
 391                 qdio_siga_sync_q(q);
 392         return get_buf_state(q, bufnr, state, 0);
 393 }
 394
 395 static inline void qdio_stop_polling(struct qdio_q *q)
 396 {
 397         if (!q->u.in.polling)
 398                 return;
 399
 400         q->u.in.polling = 0;
 401         qperf_inc(q, stop_polling);
 402
 403         /* show the card that we are not polling anymore */
 404         if (is_qebsm(q)) {
 405                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 406                                q->u.in.ack_count);
 407                 q->u.in.ack_count = 0;
 408         } else
 409                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 410 }
 411
 412 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 413 {
 414         int pos;
 415
 416         q->q_stats.nr_sbal_total += count;
 417         if (count == QDIO_MAX_BUFFERS_MASK) {
 418                 q->q_stats.nr_sbals[7]++;
 419                 return;
 420         }
 421         pos = ilog2(count);
 422         q->q_stats.nr_sbals[pos]++;
 423 }
 424
 425 static void process_buffer_error(struct qdio_q *q, unsigned int start,
 426                                  int count)
 427 {
 428         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 429                                         SLSB_P_OUTPUT_NOT_INIT;
 430
 431         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 432
 433         /* special handling for no target buffer empty */
 434         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 435             q->sbal[start]->element[15].sflags == 0x10) {
 436                 qperf_inc(q, target_full);
 437                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
 438                 goto set;
 439         }
 440
 441         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 442         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 443         DBF_ERROR("FTC:%3d C:%3d", start, count);
 444         DBF_ERROR("F14:%2x F15:%2x",
 445                   q->sbal[start]->element[14].sflags,
 446                   q->sbal[start]->element[15].sflags);
 447
 448 set:
 449         /*
 450          * Interrupts may be avoided as long as the error is present
 451          * so change the buffer state immediately to avoid starvation.
 452          */
 453         set_buf_states(q, start, state, count);
 454 }
 455
 456 static inline void inbound_primed(struct qdio_q *q, unsigned int start,
 457                                   int count)
 458 {
 459         int new;
 460
 461         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count);
 462
 463         /* for QEBSM the ACK was already set by EQBS */
 464         if (is_qebsm(q)) {
 465                 if (!q->u.in.polling) {
 466                         q->u.in.polling = 1;
 467                         q->u.in.ack_count = count;
 468                         q->u.in.ack_start = start;
 469                         return;
 470                 }
 471
 472                 /* delete the previous ACK's */
 473                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 474                                q->u.in.ack_count);
 475                 q->u.in.ack_count = count;
 476                 q->u.in.ack_start = start;
 477                 return;
 478         }
 479
 480         /*
 481          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 482          * or by the next inbound run.
 483          */
 484         new = add_buf(start, count - 1);
 485         if (q->u.in.polling) {
 486                 /* reset the previous ACK but first set the new one */
 487                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 488                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 489         } else {
 490                 q->u.in.polling = 1;
 491                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 492         }
 493
 494         q->u.in.ack_start = new;
 495         count--;
 496         if (!count)
 497                 return;
 498         /* need to change ALL buffers to get more interrupts */
 499         set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count);
 500 }
 501
 502 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 503 {
 504         unsigned char state = 0;
 505         int count;
 506
 507         q->timestamp = get_tod_clock_fast();
 508
 509         /*
 510          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 511          * would return 0.
 512          */
 513         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 514         if (!count)
 515                 return 0;
 516
 517         /*
 518          * No siga sync here, as a PCI or we after a thin interrupt
 519          * already sync'ed the queues.
 520          */
 521         count = get_buf_states(q, start, &state, count, 1, 0);
 522         if (!count)
 523                 return 0;
 524
 525         switch (state) {
 526         case SLSB_P_INPUT_PRIMED:
 527                 inbound_primed(q, start, count);
 528                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 529                         qperf_inc(q, inbound_queue_full);
 530                 if (q->irq_ptr->perf_stat_enabled)
 531                         account_sbals(q, count);
 532                 return count;
 533         case SLSB_P_INPUT_ERROR:
 534                 process_buffer_error(q, start, count);
 535                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 536                         qperf_inc(q, inbound_queue_full);
 537                 if (q->irq_ptr->perf_stat_enabled)
 538                         account_sbals_error(q, count);
 539                 return count;
 540         case SLSB_CU_INPUT_EMPTY:
 541         case SLSB_P_INPUT_NOT_INIT:
 542         case SLSB_P_INPUT_ACK:
 543                 if (q->irq_ptr->perf_stat_enabled)
 544                         q->q_stats.nr_sbal_nop++;
 545                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 546                               q->nr, start);
 547                 return 0;
 548         default:
 549                 WARN_ON_ONCE(1);
 550                 return 0;
 551         }
 552 }
 553
 554 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start)
 555 {
 556         int count;
 557
 558         count = get_inbound_buffer_frontier(q, start);
 559
 560         if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 561                 q->u.in.timestamp = get_tod_clock();
 562
 563         return count;
 564 }
 565
 566 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 567 {
 568         unsigned char state = 0;
 569
 570         if (!atomic_read(&q->nr_buf_used))
 571                 return 1;
 572
 573         if (need_siga_sync(q))
 574                 qdio_siga_sync_q(q);
 575         get_buf_state(q, start, &state, 0);
 576
 577         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 578                 /* more work coming */
 579                 return 0;
 580
 581         if (is_thinint_irq(q->irq_ptr))
 582                 return 1;
 583
 584         /* don't poll under z/VM */
 585         if (MACHINE_IS_VM)
 586                 return 1;
 587
 588         /*
 589          * At this point we know, that inbound first_to_check
 590          * has (probably) not moved (see qdio_inbound_processing).
 591          */
 592         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 593                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start);
 594                 return 1;
 595         } else
 596                 return 0;
 597 }
 598
 599 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 600 {
 601         unsigned char state = 0;
 602         int j, b = start;
 603
 604         for (j = 0; j < count; ++j) {
 605                 get_buf_state(q, b, &state, 0);
 606                 if (state == SLSB_P_OUTPUT_PENDING) {
 607                         struct qaob *aob = q->u.out.aobs[b];
 608                         if (aob == NULL)
 609                                 continue;
 610
 611                         q->u.out.sbal_state[b].flags |=
 612                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 613                         q->u.out.aobs[b] = NULL;
 614                 }
 615                 b = next_buf(b);
 616         }
 617 }
 618
 619 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 620                                         int bufnr)
 621 {
 622         unsigned long phys_aob = 0;
 623
 624         if (!q->use_cq)
 625                 return 0;
 626
 627         if (!q->aobs[bufnr]) {
 628                 struct qaob *aob = qdio_allocate_aob();
 629                 q->aobs[bufnr] = aob;
 630         }
 631         if (q->aobs[bufnr]) {
 632                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 633                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 634                 WARN_ON_ONCE(phys_aob & 0xFF);
 635         }
 636
 637         q->sbal_state[bufnr].flags = 0;
 638         return phys_aob;
 639 }
 640
 641 static void qdio_kick_handler(struct qdio_q *q, unsigned int count)
 642 {
 643         int start = q->first_to_kick;
 644
 645         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 646                 return;
 647
 648         if (q->is_input_q) {
 649                 qperf_inc(q, inbound_handler);
 650                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 651         } else {
 652                 qperf_inc(q, outbound_handler);
 653                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 654                               start, count);
 655                 if (q->u.out.use_cq)
 656                         qdio_handle_aobs(q, start, count);
 657         }
 658
 659         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 660                    q->irq_ptr->int_parm);
 661
 662         /* for the next time */
 663         q->first_to_kick = add_buf(start, count);
 664         q->qdio_error = 0;
 665 }
 666
 667 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 668 {
 669         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 670                 tasklet_schedule(&q->tasklet);
 671                 return 0;
 672         }
 673         return -EPERM;
 674 }
 675
 676 static void __qdio_inbound_processing(struct qdio_q *q)
 677 {
 678         unsigned int start = q->first_to_check;
 679         int count;
 680
 681         qperf_inc(q, tasklet_inbound);
 682
 683         count = qdio_inbound_q_moved(q, start);
 684         if (count == 0)
 685                 return;
 686
 687         start = add_buf(start, count);
 688         q->first_to_check = start;
 689         qdio_kick_handler(q, count);
 690
 691         if (!qdio_inbound_q_done(q, start)) {
 692                 /* means poll time is not yet over */
 693                 qperf_inc(q, tasklet_inbound_resched);
 694                 if (!qdio_tasklet_schedule(q))
 695                         return;
 696         }
 697
 698         qdio_stop_polling(q);
 699         /*
 700          * We need to check again to not lose initiative after
 701          * resetting the ACK state.
 702          */
 703         if (!qdio_inbound_q_done(q, start)) {
 704                 qperf_inc(q, tasklet_inbound_resched2);
 705                 qdio_tasklet_schedule(q);
 706         }
 707 }
 708
 709 void qdio_inbound_processing(unsigned long data)
 710 {
 711         struct qdio_q *q = (struct qdio_q *)data;
 712         __qdio_inbound_processing(q);
 713 }
 714
 715 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 716 {
 717         unsigned char state = 0;
 718         int count;
 719
 720         q->timestamp = get_tod_clock_fast();
 721
 722         if (need_siga_sync(q))
 723                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 724                     !pci_out_supported(q->irq_ptr)) ||
 725                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 726                     multicast_outbound(q)))
 727                         qdio_siga_sync_q(q);
 728
 729         count = atomic_read(&q->nr_buf_used);
 730         if (!count)
 731                 return 0;
 732
 733         count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
 734         if (!count)
 735                 return 0;
 736
 737         switch (state) {
 738         case SLSB_P_OUTPUT_EMPTY:
 739         case SLSB_P_OUTPUT_PENDING:
 740                 /* the adapter got it */
 741                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 742                         "out empty:%1d %02x", q->nr, count);
 743
 744                 atomic_sub(count, &q->nr_buf_used);
 745                 if (q->irq_ptr->perf_stat_enabled)
 746                         account_sbals(q, count);
 747                 return count;
 748         case SLSB_P_OUTPUT_ERROR:
 749                 process_buffer_error(q, start, count);
 750                 atomic_sub(count, &q->nr_buf_used);
 751                 if (q->irq_ptr->perf_stat_enabled)
 752                         account_sbals_error(q, count);
 753                 return count;
 754         case SLSB_CU_OUTPUT_PRIMED:
 755                 /* the adapter has not fetched the output yet */
 756                 if (q->irq_ptr->perf_stat_enabled)
 757                         q->q_stats.nr_sbal_nop++;
 758                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 759                               q->nr);
 760                 return 0;
 761         case SLSB_P_OUTPUT_NOT_INIT:
 762         case SLSB_P_OUTPUT_HALTED:
 763                 return 0;
 764         default:
 765                 WARN_ON_ONCE(1);
 766                 return 0;
 767         }
 768 }
 769
 770 /* all buffers processed? */
 771 static inline int qdio_outbound_q_done(struct qdio_q *q)
 772 {
 773         return atomic_read(&q->nr_buf_used) == 0;
 774 }
 775
 776 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
 777 {
 778         int count;
 779
 780         count = get_outbound_buffer_frontier(q, start);
 781
 782         if (count)
 783                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 784
 785         return count;
 786 }
 787
 788 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 789 {
 790         int retries = 0, cc;
 791         unsigned int busy_bit;
 792
 793         if (!need_siga_out(q))
 794                 return 0;
 795
 796         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 797 retry:
 798         qperf_inc(q, siga_write);
 799
 800         cc = qdio_siga_output(q, &busy_bit, aob);
 801         switch (cc) {
 802         case 0:
 803                 break;
 804         case 2:
 805                 if (busy_bit) {
 806                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 807                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 808                                 goto retry;
 809                         }
 810                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 811                         cc = -EBUSY;
 812                 } else {
 813                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 814                         cc = -ENOBUFS;
 815                 }
 816                 break;
 817         case 1:
 818         case 3:
 819                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 820                 cc = -EIO;
 821                 break;
 822         }
 823         if (retries) {
 824                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 825                 DBF_ERROR("count:%u", retries);
 826         }
 827         return cc;
 828 }
 829
 830 static void __qdio_outbound_processing(struct qdio_q *q)
 831 {
 832         unsigned int start = q->first_to_check;
 833         int count;
 834
 835         qperf_inc(q, tasklet_outbound);
 836         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 837
 838         count = qdio_outbound_q_moved(q, start);
 839         if (count) {
 840                 q->first_to_check = add_buf(start, count);
 841                 qdio_kick_handler(q, count);
 842         }
 843
 844         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 845             !qdio_outbound_q_done(q))
 846                 goto sched;
 847
 848         if (q->u.out.pci_out_enabled)
 849                 return;
 850
 851         /*
 852          * Now we know that queue type is either qeth without pci enabled
 853          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 854          * is noticed and outbound_handler is called after some time.
 855          */
 856         if (qdio_outbound_q_done(q))
 857                 del_timer_sync(&q->u.out.timer);
 858         else
 859                 if (!timer_pending(&q->u.out.timer) &&
 860                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 861                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 862         return;
 863
 864 sched:
 865         qdio_tasklet_schedule(q);
 866 }
 867
 868 /* outbound tasklet */
 869 void qdio_outbound_processing(unsigned long data)
 870 {
 871         struct qdio_q *q = (struct qdio_q *)data;
 872         __qdio_outbound_processing(q);
 873 }
 874
 875 void qdio_outbound_timer(struct timer_list *t)
 876 {
 877         struct qdio_q *q = from_timer(q, t, u.out.timer);
 878
 879         qdio_tasklet_schedule(q);
 880 }
 881
 882 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 883 {
 884         struct qdio_q *out;
 885         int i;
 886
 887         if (!pci_out_supported(irq))
 888                 return;
 889
 890         for_each_output_queue(irq, out, i)
 891                 if (!qdio_outbound_q_done(out))
 892                         qdio_tasklet_schedule(out);
 893 }
 894
 895 static void __tiqdio_inbound_processing(struct qdio_q *q)
 896 {
 897         unsigned int start = q->first_to_check;
 898         int count;
 899
 900         qperf_inc(q, tasklet_inbound);
 901         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 902                 qdio_sync_queues(q);
 903
 904         /* The interrupt could be caused by a PCI request: */
 905         qdio_check_outbound_pci_queues(q->irq_ptr);
 906
 907         count = qdio_inbound_q_moved(q, start);
 908         if (count == 0)
 909                 return;
 910
 911         start = add_buf(start, count);
 912         q->first_to_check = start;
 913         qdio_kick_handler(q, count);
 914
 915         if (!qdio_inbound_q_done(q, start)) {
 916                 qperf_inc(q, tasklet_inbound_resched);
 917                 if (!qdio_tasklet_schedule(q))
 918                         return;
 919         }
 920
 921         qdio_stop_polling(q);
 922         /*
 923          * We need to check again to not lose initiative after
 924          * resetting the ACK state.
 925          */
 926         if (!qdio_inbound_q_done(q, start)) {
 927                 qperf_inc(q, tasklet_inbound_resched2);
 928                 qdio_tasklet_schedule(q);
 929         }
 930 }
 931
 932 void tiqdio_inbound_processing(unsigned long data)
 933 {
 934         struct qdio_q *q = (struct qdio_q *)data;
 935         __tiqdio_inbound_processing(q);
 936 }
 937
 938 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 939                                   enum qdio_irq_states state)
 940 {
 941         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 942
 943         irq_ptr->state = state;
 944         mb();
 945 }
 946
 947 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 948 {
 949         if (irb->esw.esw0.erw.cons) {
 950                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 951                 DBF_ERROR_HEX(irb, 64);
 952                 DBF_ERROR_HEX(irb->ecw, 64);
 953         }
 954 }
 955
 956 /* PCI interrupt handler */
 957 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 958 {
 959         int i;
 960         struct qdio_q *q;
 961
 962         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 963                 return;
 964
 965         for_each_input_queue(irq_ptr, q, i) {
 966                 if (q->u.in.queue_start_poll) {
 967                         /* skip if polling is enabled or already in work */
 968                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 969                                      &q->u.in.queue_irq_state)) {
 970                                 qperf_inc(q, int_discarded);
 971                                 continue;
 972                         }
 973                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 974                                                  q->irq_ptr->int_parm);
 975                 } else {
 976                         tasklet_schedule(&q->tasklet);
 977                 }
 978         }
 979
 980         if (!pci_out_supported(irq_ptr))
 981                 return;
 982
 983         for_each_output_queue(irq_ptr, q, i) {
 984                 if (qdio_outbound_q_done(q))
 985                         continue;
 986                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 987                         qdio_siga_sync_q(q);
 988                 qdio_tasklet_schedule(q);
 989         }
 990 }
 991
 992 static void qdio_handle_activate_check(struct ccw_device *cdev,
 993                                 unsigned long intparm, int cstat, int dstat)
 994 {
 995         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 996         struct qdio_q *q;
 997         int count;
 998
 999         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1000         DBF_ERROR("intp :%lx", intparm);
1001         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1002
1003         if (irq_ptr->nr_input_qs) {
1004                 q = irq_ptr->input_qs[0];
1005         } else if (irq_ptr->nr_output_qs) {
1006                 q = irq_ptr->output_qs[0];
1007         } else {
1008                 dump_stack();
1009                 goto no_handler;
1010         }
1011
1012         count = sub_buf(q->first_to_check, q->first_to_kick);
1013         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1014                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1015 no_handler:
1016         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1017         /*
1018          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1019          * Therefore we call the LGR detection function here.
1020          */
1021         lgr_info_log();
1022 }
1023
1024 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1025                                       int dstat)
1026 {
1027         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1028
1029         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1030
1031         if (cstat)
1032                 goto error;
1033         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1034                 goto error;
1035         if (!(dstat & DEV_STAT_DEV_END))
1036                 goto error;
1037         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1038         return;
1039
1040 error:
1041         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1042         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1043         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1044 }
1045
1046 /* qdio interrupt handler */
1047 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1048                       struct irb *irb)
1049 {
1050         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1051         struct subchannel_id schid;
1052         int cstat, dstat;
1053
1054         if (!intparm || !irq_ptr) {
1055                 ccw_device_get_schid(cdev, &schid);
1056                 DBF_ERROR("qint:%4x", schid.sch_no);
1057                 return;
1058         }
1059
1060         if (irq_ptr->perf_stat_enabled)
1061                 irq_ptr->perf_stat.qdio_int++;
1062
1063         if (IS_ERR(irb)) {
1064                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1065                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1066                 wake_up(&cdev->private->wait_q);
1067                 return;
1068         }
1069         qdio_irq_check_sense(irq_ptr, irb);
1070         cstat = irb->scsw.cmd.cstat;
1071         dstat = irb->scsw.cmd.dstat;
1072
1073         switch (irq_ptr->state) {
1074         case QDIO_IRQ_STATE_INACTIVE:
1075                 qdio_establish_handle_irq(cdev, cstat, dstat);
1076                 break;
1077         case QDIO_IRQ_STATE_CLEANUP:
1078                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1079                 break;
1080         case QDIO_IRQ_STATE_ESTABLISHED:
1081         case QDIO_IRQ_STATE_ACTIVE:
1082                 if (cstat & SCHN_STAT_PCI) {
1083                         qdio_int_handler_pci(irq_ptr);
1084                         return;
1085                 }
1086                 if (cstat || dstat)
1087                         qdio_handle_activate_check(cdev, intparm, cstat,
1088                                                    dstat);
1089                 break;
1090         case QDIO_IRQ_STATE_STOPPED:
1091                 break;
1092         default:
1093                 WARN_ON_ONCE(1);
1094         }
1095         wake_up(&cdev->private->wait_q);
1096 }
1097
1098 /**
1099  * qdio_get_ssqd_desc - get qdio subchannel description
1100  * @cdev: ccw device to get description for
1101  * @data: where to store the ssqd
1102  *
1103  * Returns 0 or an error code. The results of the chsc are stored in the
1104  * specified structure.
1105  */
1106 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1107                        struct qdio_ssqd_desc *data)
1108 {
1109         struct subchannel_id schid;
1110
1111         if (!cdev || !cdev->private)
1112                 return -EINVAL;
1113
1114         ccw_device_get_schid(cdev, &schid);
1115         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1116         return qdio_setup_get_ssqd(NULL, &schid, data);
1117 }
1118 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1119
1120 static void qdio_shutdown_queues(struct ccw_device *cdev)
1121 {
1122         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1123         struct qdio_q *q;
1124         int i;
1125
1126         for_each_input_queue(irq_ptr, q, i)
1127                 tasklet_kill(&q->tasklet);
1128
1129         for_each_output_queue(irq_ptr, q, i) {
1130                 del_timer_sync(&q->u.out.timer);
1131                 tasklet_kill(&q->tasklet);
1132         }
1133 }
1134
1135 /**
1136  * qdio_shutdown - shut down a qdio subchannel
1137  * @cdev: associated ccw device
1138  * @how: use halt or clear to shutdown
1139  */
1140 int qdio_shutdown(struct ccw_device *cdev, int how)
1141 {
1142         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1143         struct subchannel_id schid;
1144         int rc;
1145
1146         if (!irq_ptr)
1147                 return -ENODEV;
1148
1149         WARN_ON_ONCE(irqs_disabled());
1150         ccw_device_get_schid(cdev, &schid);
1151         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1152
1153         mutex_lock(&irq_ptr->setup_mutex);
1154         /*
1155          * Subchannel was already shot down. We cannot prevent being called
1156          * twice since cio may trigger a shutdown asynchronously.
1157          */
1158         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1159                 mutex_unlock(&irq_ptr->setup_mutex);
1160                 return 0;
1161         }
1162
1163         /*
1164          * Indicate that the device is going down. Scheduling the queue
1165          * tasklets is forbidden from here on.
1166          */
1167         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1168
1169         tiqdio_remove_input_queues(irq_ptr);
1170         qdio_shutdown_queues(cdev);
1171         qdio_shutdown_debug_entries(irq_ptr);
1172
1173         /* cleanup subchannel */
1174         spin_lock_irq(get_ccwdev_lock(cdev));
1175
1176         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1177                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1178         else
1179                 /* default behaviour is halt */
1180                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1181         if (rc) {
1182                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1183                 DBF_ERROR("rc:%4d", rc);
1184                 goto no_cleanup;
1185         }
1186
1187         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1188         spin_unlock_irq(get_ccwdev_lock(cdev));
1189         wait_event_interruptible_timeout(cdev->private->wait_q,
1190                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1191                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1192                 10 * HZ);
1193         spin_lock_irq(get_ccwdev_lock(cdev));
1194
1195 no_cleanup:
1196         qdio_shutdown_thinint(irq_ptr);
1197
1198         /* restore interrupt handler */
1199         if ((void *)cdev->handler == (void *)qdio_int_handler) {
1200                 cdev->handler = irq_ptr->orig_handler;
1201                 cdev->private->intparm = 0;
1202         }
1203         spin_unlock_irq(get_ccwdev_lock(cdev));
1204
1205         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1206         mutex_unlock(&irq_ptr->setup_mutex);
1207         if (rc)
1208                 return rc;
1209         return 0;
1210 }
1211 EXPORT_SYMBOL_GPL(qdio_shutdown);
1212
1213 /**
1214  * qdio_free - free data structures for a qdio subchannel
1215  * @cdev: associated ccw device
1216  */
1217 int qdio_free(struct ccw_device *cdev)
1218 {
1219         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1220         struct subchannel_id schid;
1221
1222         if (!irq_ptr)
1223                 return -ENODEV;
1224
1225         ccw_device_get_schid(cdev, &schid);
1226         DBF_EVENT("qfree:%4x", schid.sch_no);
1227         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1228         mutex_lock(&irq_ptr->setup_mutex);
1229
1230         irq_ptr->debug_area = NULL;
1231         cdev->private->qdio_data = NULL;
1232         mutex_unlock(&irq_ptr->setup_mutex);
1233
1234         qdio_release_memory(irq_ptr);
1235         return 0;
1236 }
1237 EXPORT_SYMBOL_GPL(qdio_free);
1238
1239 /**
1240  * qdio_allocate - allocate qdio queues and associated data
1241  * @init_data: initialization data
1242  */
1243 int qdio_allocate(struct qdio_initialize *init_data)
1244 {
1245         struct subchannel_id schid;
1246         struct qdio_irq *irq_ptr;
1247
1248         ccw_device_get_schid(init_data->cdev, &schid);
1249         DBF_EVENT("qallocate:%4x", schid.sch_no);
1250
1251         if ((init_data->no_input_qs && !init_data->input_handler) ||
1252             (init_data->no_output_qs && !init_data->output_handler))
1253                 return -EINVAL;
1254
1255         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1256             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1257                 return -EINVAL;
1258
1259         if ((!init_data->input_sbal_addr_array) ||
1260             (!init_data->output_sbal_addr_array))
1261                 return -EINVAL;
1262
1263         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1264         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1265         if (!irq_ptr)
1266                 goto out_err;
1267
1268         mutex_init(&irq_ptr->setup_mutex);
1269         if (qdio_allocate_dbf(init_data, irq_ptr))
1270                 goto out_rel;
1271
1272         /*
1273          * Allocate a page for the chsc calls in qdio_establish.
1274          * Must be pre-allocated since a zfcp recovery will call
1275          * qdio_establish. In case of low memory and swap on a zfcp disk
1276          * we may not be able to allocate memory otherwise.
1277          */
1278         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1279         if (!irq_ptr->chsc_page)
1280                 goto out_rel;
1281
1282         /* qdr is used in ccw1.cda which is u32 */
1283         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1284         if (!irq_ptr->qdr)
1285                 goto out_rel;
1286
1287         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1288                              init_data->no_output_qs))
1289                 goto out_rel;
1290
1291         init_data->cdev->private->qdio_data = irq_ptr;
1292         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1293         return 0;
1294 out_rel:
1295         qdio_release_memory(irq_ptr);
1296 out_err:
1297         return -ENOMEM;
1298 }
1299 EXPORT_SYMBOL_GPL(qdio_allocate);
1300
1301 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1302 {
1303         struct qdio_q *q = irq_ptr->input_qs[0];
1304         int i, use_cq = 0;
1305
1306         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1307                 use_cq = 1;
1308
1309         for_each_output_queue(irq_ptr, q, i) {
1310                 if (use_cq) {
1311                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1312                                 use_cq = 0;
1313                                 continue;
1314                         }
1315                 } else
1316                         qdio_disable_async_operation(&q->u.out);
1317         }
1318         DBF_EVENT("use_cq:%d", use_cq);
1319 }
1320
1321 /**
1322  * qdio_establish - establish queues on a qdio subchannel
1323  * @init_data: initialization data
1324  */
1325 int qdio_establish(struct qdio_initialize *init_data)
1326 {
1327         struct ccw_device *cdev = init_data->cdev;
1328         struct subchannel_id schid;
1329         struct qdio_irq *irq_ptr;
1330         int rc;
1331
1332         ccw_device_get_schid(cdev, &schid);
1333         DBF_EVENT("qestablish:%4x", schid.sch_no);
1334
1335         irq_ptr = cdev->private->qdio_data;
1336         if (!irq_ptr)
1337                 return -ENODEV;
1338
1339         mutex_lock(&irq_ptr->setup_mutex);
1340         qdio_setup_irq(init_data);
1341
1342         rc = qdio_establish_thinint(irq_ptr);
1343         if (rc) {
1344                 mutex_unlock(&irq_ptr->setup_mutex);
1345                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1346                 return rc;
1347         }
1348
1349         /* establish q */
1350         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1351         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1352         irq_ptr->ccw.count = irq_ptr->equeue.count;
1353         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1354
1355         spin_lock_irq(get_ccwdev_lock(cdev));
1356         ccw_device_set_options_mask(cdev, 0);
1357
1358         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1359         spin_unlock_irq(get_ccwdev_lock(cdev));
1360         if (rc) {
1361                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1362                 DBF_ERROR("rc:%4x", rc);
1363                 mutex_unlock(&irq_ptr->setup_mutex);
1364                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1365                 return rc;
1366         }
1367
1368         wait_event_interruptible_timeout(cdev->private->wait_q,
1369                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1370                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1371
1372         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1373                 mutex_unlock(&irq_ptr->setup_mutex);
1374                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1375                 return -EIO;
1376         }
1377
1378         qdio_setup_ssqd_info(irq_ptr);
1379
1380         qdio_detect_hsicq(irq_ptr);
1381
1382         /* qebsm is now setup if available, initialize buffer states */
1383         qdio_init_buf_states(irq_ptr);
1384
1385         mutex_unlock(&irq_ptr->setup_mutex);
1386         qdio_print_subchannel_info(irq_ptr, cdev);
1387         qdio_setup_debug_entries(irq_ptr, cdev);
1388         return 0;
1389 }
1390 EXPORT_SYMBOL_GPL(qdio_establish);
1391
1392 /**
1393  * qdio_activate - activate queues on a qdio subchannel
1394  * @cdev: associated cdev
1395  */
1396 int qdio_activate(struct ccw_device *cdev)
1397 {
1398         struct subchannel_id schid;
1399         struct qdio_irq *irq_ptr;
1400         int rc;
1401
1402         ccw_device_get_schid(cdev, &schid);
1403         DBF_EVENT("qactivate:%4x", schid.sch_no);
1404
1405         irq_ptr = cdev->private->qdio_data;
1406         if (!irq_ptr)
1407                 return -ENODEV;
1408
1409         mutex_lock(&irq_ptr->setup_mutex);
1410         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1411                 rc = -EBUSY;
1412                 goto out;
1413         }
1414
1415         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1416         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1417         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1418         irq_ptr->ccw.cda = 0;
1419
1420         spin_lock_irq(get_ccwdev_lock(cdev));
1421         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1422
1423         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1424                               0, DOIO_DENY_PREFETCH);
1425         spin_unlock_irq(get_ccwdev_lock(cdev));
1426         if (rc) {
1427                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1428                 DBF_ERROR("rc:%4x", rc);
1429                 goto out;
1430         }
1431
1432         if (is_thinint_irq(irq_ptr))
1433                 tiqdio_add_input_queues(irq_ptr);
1434
1435         /* wait for subchannel to become active */
1436         msleep(5);
1437
1438         switch (irq_ptr->state) {
1439         case QDIO_IRQ_STATE_STOPPED:
1440         case QDIO_IRQ_STATE_ERR:
1441                 rc = -EIO;
1442                 break;
1443         default:
1444                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1445                 rc = 0;
1446         }
1447 out:
1448         mutex_unlock(&irq_ptr->setup_mutex);
1449         return rc;
1450 }
1451 EXPORT_SYMBOL_GPL(qdio_activate);
1452
1453 static inline int buf_in_between(int bufnr, int start, int count)
1454 {
1455         int end = add_buf(start, count);
1456
1457         if (end > start) {
1458                 if (bufnr >= start && bufnr < end)
1459                         return 1;
1460                 else
1461                         return 0;
1462         }
1463
1464         /* wrap-around case */
1465         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1466             (bufnr < end))
1467                 return 1;
1468         else
1469                 return 0;
1470 }
1471
1472 /**
1473  * handle_inbound - reset processed input buffers
1474  * @q: queue containing the buffers
1475  * @callflags: flags
1476  * @bufnr: first buffer to process
1477  * @count: how many buffers are emptied
1478  */
1479 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1480                           int bufnr, int count)
1481 {
1482         int diff;
1483
1484         qperf_inc(q, inbound_call);
1485
1486         if (!q->u.in.polling)
1487                 goto set;
1488
1489         /* protect against stop polling setting an ACK for an emptied slsb */
1490         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1491                 /* overwriting everything, just delete polling status */
1492                 q->u.in.polling = 0;
1493                 q->u.in.ack_count = 0;
1494                 goto set;
1495         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1496                 if (is_qebsm(q)) {
1497                         /* partial overwrite, just update ack_start */
1498                         diff = add_buf(bufnr, count);
1499                         diff = sub_buf(diff, q->u.in.ack_start);
1500                         q->u.in.ack_count -= diff;
1501                         if (q->u.in.ack_count <= 0) {
1502                                 q->u.in.polling = 0;
1503                                 q->u.in.ack_count = 0;
1504                                 goto set;
1505                         }
1506                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1507                 }
1508                 else
1509                         /* the only ACK will be deleted, so stop polling */
1510                         q->u.in.polling = 0;
1511         }
1512
1513 set:
1514         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1515         atomic_add(count, &q->nr_buf_used);
1516
1517         if (need_siga_in(q))
1518                 return qdio_siga_input(q);
1519
1520         return 0;
1521 }
1522
1523 /**
1524  * handle_outbound - process filled outbound buffers
1525  * @q: queue containing the buffers
1526  * @callflags: flags
1527  * @bufnr: first buffer to process
1528  * @count: how many buffers are filled
1529  */
1530 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1531                            int bufnr, int count)
1532 {
1533         unsigned char state = 0;
1534         int used, rc = 0;
1535
1536         qperf_inc(q, outbound_call);
1537
1538         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1539         used = atomic_add_return(count, &q->nr_buf_used);
1540
1541         if (used == QDIO_MAX_BUFFERS_PER_Q)
1542                 qperf_inc(q, outbound_queue_full);
1543
1544         if (callflags & QDIO_FLAG_PCI_OUT) {
1545                 q->u.out.pci_out_enabled = 1;
1546                 qperf_inc(q, pci_request_int);
1547         } else
1548                 q->u.out.pci_out_enabled = 0;
1549
1550         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1551                 unsigned long phys_aob = 0;
1552
1553                 /* One SIGA-W per buffer required for unicast HSI */
1554                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1555
1556                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1557
1558                 rc = qdio_kick_outbound_q(q, phys_aob);
1559         } else if (need_siga_sync(q)) {
1560                 rc = qdio_siga_sync_q(q);
1561         } else {
1562                 /* try to fast requeue buffers */
1563                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1564                 if (state != SLSB_CU_OUTPUT_PRIMED)
1565                         rc = qdio_kick_outbound_q(q, 0);
1566                 else
1567                         qperf_inc(q, fast_requeue);
1568         }
1569
1570         /* in case of SIGA errors we must process the error immediately */
1571         if (used >= q->u.out.scan_threshold || rc)
1572                 qdio_tasklet_schedule(q);
1573         else
1574                 /* free the SBALs in case of no further traffic */
1575                 if (!timer_pending(&q->u.out.timer) &&
1576                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1577                         mod_timer(&q->u.out.timer, jiffies + HZ);
1578         return rc;
1579 }
1580
1581 /**
1582  * do_QDIO - process input or output buffers
1583  * @cdev: associated ccw_device for the qdio subchannel
1584  * @callflags: input or output and special flags from the program
1585  * @q_nr: queue number
1586  * @bufnr: buffer number
1587  * @count: how many buffers to process
1588  */
1589 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1590             int q_nr, unsigned int bufnr, unsigned int count)
1591 {
1592         struct qdio_irq *irq_ptr;
1593
1594         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1595                 return -EINVAL;
1596
1597         irq_ptr = cdev->private->qdio_data;
1598         if (!irq_ptr)
1599                 return -ENODEV;
1600
1601         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1602                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1603
1604         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1605                 return -EIO;
1606         if (!count)
1607                 return 0;
1608         if (callflags & QDIO_FLAG_SYNC_INPUT)
1609                 return handle_inbound(irq_ptr->input_qs[q_nr],
1610                                       callflags, bufnr, count);
1611         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1612                 return handle_outbound(irq_ptr->output_qs[q_nr],
1613                                        callflags, bufnr, count);
1614         return -EINVAL;
1615 }
1616 EXPORT_SYMBOL_GPL(do_QDIO);
1617
1618 /**
1619  * qdio_start_irq - process input buffers
1620  * @cdev: associated ccw_device for the qdio subchannel
1621  * @nr: input queue number
1622  *
1623  * Return codes
1624  *   0 - success
1625  *   1 - irqs not started since new data is available
1626  */
1627 int qdio_start_irq(struct ccw_device *cdev, int nr)
1628 {
1629         struct qdio_q *q;
1630         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1631
1632         if (!irq_ptr)
1633                 return -ENODEV;
1634         q = irq_ptr->input_qs[nr];
1635
1636         clear_nonshared_ind(irq_ptr);
1637         qdio_stop_polling(q);
1638         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1639
1640         /*
1641          * We need to check again to not lose initiative after
1642          * resetting the ACK state.
1643          */
1644         if (test_nonshared_ind(irq_ptr))
1645                 goto rescan;
1646         if (!qdio_inbound_q_done(q, q->first_to_check))
1647                 goto rescan;
1648         return 0;
1649
1650 rescan:
1651         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1652                              &q->u.in.queue_irq_state))
1653                 return 0;
1654         else
1655                 return 1;
1656
1657 }
1658 EXPORT_SYMBOL(qdio_start_irq);
1659
1660 /**
1661  * qdio_get_next_buffers - process input buffers
1662  * @cdev: associated ccw_device for the qdio subchannel
1663  * @nr: input queue number
1664  * @bufnr: first filled buffer number
1665  * @error: buffers are in error state
1666  *
1667  * Return codes
1668  *   < 0 - error
1669  *   = 0 - no new buffers found
1670  *   > 0 - number of processed buffers
1671  */
1672 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1673                           int *error)
1674 {
1675         struct qdio_q *q;
1676         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1677         unsigned int start;
1678         int count;
1679
1680         if (!irq_ptr)
1681                 return -ENODEV;
1682         q = irq_ptr->input_qs[nr];
1683         start = q->first_to_check;
1684
1685         /*
1686          * Cannot rely on automatic sync after interrupt since queues may
1687          * also be examined without interrupt.
1688          */
1689         if (need_siga_sync(q))
1690                 qdio_sync_queues(q);
1691
1692         qdio_check_outbound_pci_queues(irq_ptr);
1693
1694         count = qdio_inbound_q_moved(q, start);
1695         if (count == 0)
1696                 return 0;
1697
1698         start = add_buf(start, count);
1699         q->first_to_check = start;
1700
1701         /* Note: upper-layer MUST stop processing immediately here ... */
1702         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1703                 return -EIO;
1704
1705         *bufnr = q->first_to_kick;
1706         *error = q->qdio_error;
1707
1708         /* for the next time */
1709         q->first_to_kick = add_buf(q->first_to_kick, count);
1710         q->qdio_error = 0;
1711
1712         return count;
1713 }
1714 EXPORT_SYMBOL(qdio_get_next_buffers);
1715
1716 /**
1717  * qdio_stop_irq - disable interrupt processing for the device
1718  * @cdev: associated ccw_device for the qdio subchannel
1719  * @nr: input queue number
1720  *
1721  * Return codes
1722  *   0 - interrupts were already disabled
1723  *   1 - interrupts successfully disabled
1724  */
1725 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1726 {
1727         struct qdio_q *q;
1728         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1729
1730         if (!irq_ptr)
1731                 return -ENODEV;
1732         q = irq_ptr->input_qs[nr];
1733
1734         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1735                              &q->u.in.queue_irq_state))
1736                 return 0;
1737         else
1738                 return 1;
1739 }
1740 EXPORT_SYMBOL(qdio_stop_irq);
1741
1742 /**
1743  * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1744  * @schid:              Subchannel ID.
1745  * @cnc:                Boolean Change-Notification Control
1746  * @response:           Response code will be stored at this address
1747  * @cb:                 Callback function will be executed for each element
1748  *                      of the address list
1749  * @priv:               Pointer to pass to the callback function.
1750  *
1751  * Performs "Store-network-bridging-information list" operation and calls
1752  * the callback function for every entry in the list. If "change-
1753  * notification-control" is set, further changes in the address list
1754  * will be reported via the IPA command.
1755  */
1756 int qdio_pnso_brinfo(struct subchannel_id schid,
1757                 int cnc, u16 *response,
1758                 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1759                                 void *entry),
1760                 void *priv)
1761 {
1762         struct chsc_pnso_area *rr;
1763         int rc;
1764         u32 prev_instance = 0;
1765         int isfirstblock = 1;
1766         int i, size, elems;
1767
1768         rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1769         if (rr == NULL)
1770                 return -ENOMEM;
1771         do {
1772                 /* on the first iteration, naihdr.resume_token will be zero */
1773                 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1774                 if (rc != 0 && rc != -EBUSY)
1775                         goto out;
1776                 if (rr->response.code != 1) {
1777                         rc = -EIO;
1778                         continue;
1779                 } else
1780                         rc = 0;
1781
1782                 if (cb == NULL)
1783                         continue;
1784
1785                 size = rr->naihdr.naids;
1786                 elems = (rr->response.length -
1787                                 sizeof(struct chsc_header) -
1788                                 sizeof(struct chsc_brinfo_naihdr)) /
1789                                 size;
1790
1791                 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1792                         /* Inform the caller that they need to scrap */
1793                         /* the data that was already reported via cb */
1794                                 rc = -EAGAIN;
1795                                 break;
1796                 }
1797                 isfirstblock = 0;
1798                 prev_instance = rr->naihdr.instance;
1799                 for (i = 0; i < elems; i++)
1800                         switch (size) {
1801                         case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1802                                 (*cb)(priv, l3_ipv6_addr,
1803                                                 &rr->entries.l3_ipv6[i]);
1804                                 break;
1805                         case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1806                                 (*cb)(priv, l3_ipv4_addr,
1807                                                 &rr->entries.l3_ipv4[i]);
1808                                 break;
1809                         case sizeof(struct qdio_brinfo_entry_l2):
1810                                 (*cb)(priv, l2_addr_lnid,
1811                                                 &rr->entries.l2[i]);
1812                                 break;
1813                         default:
1814                                 WARN_ON_ONCE(1);
1815                                 rc = -EIO;
1816                                 goto out;
1817                         }
1818         } while (rr->response.code == 0x0107 ||  /* channel busy */
1819                   (rr->response.code == 1 && /* list stored */
1820                    /* resume token is non-zero => list incomplete */
1821                    (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1822         (*response) = rr->response.code;
1823
1824 out:
1825         free_page((unsigned long)rr);
1826         return rc;
1827 }
1828 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1829
1830 static int __init init_QDIO(void)
1831 {
1832         int rc;
1833
1834         rc = qdio_debug_init();
1835         if (rc)
1836                 return rc;
1837         rc = qdio_setup_init();
1838         if (rc)
1839                 goto out_debug;
1840         rc = tiqdio_allocate_memory();
1841         if (rc)
1842                 goto out_cache;
1843         rc = tiqdio_register_thinints();
1844         if (rc)
1845                 goto out_ti;
1846         return 0;
1847
1848 out_ti:
1849         tiqdio_free_memory();
1850 out_cache:
1851         qdio_setup_exit();
1852 out_debug:
1853         qdio_debug_exit();
1854         return rc;
1855 }
1856
1857 static void __exit exit_QDIO(void)
1858 {
1859         tiqdio_unregister_thinints();
1860         tiqdio_free_memory();
1861         qdio_setup_exit();
1862         qdio_debug_exit();
1863 }
1864
1865 module_init(init_QDIO);
1866 module_exit(exit_QDIO);