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