drivers/s390/cio/qdio_main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   4  *
   5  * Copyright IBM Corp. 2000, 2008
   6  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   7  *            Jan Glauber <jang@linux.vnet.ibm.com>
   8  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   9  */
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/timer.h>
  14 #include <linux/delay.h>
  15 #include <linux/gfp.h>
  16 #include <linux/io.h>
  17 #include <linux/atomic.h>
  18 #include <asm/debug.h>
  19 #include <asm/qdio.h>
  20 #include <asm/ipl.h>
  21
  22 #include "cio.h"
  23 #include "css.h"
  24 #include "device.h"
  25 #include "qdio.h"
  26 #include "qdio_debug.h"
  27
  28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  29         "Jan Glauber <jang@linux.vnet.ibm.com>");
  30 MODULE_DESCRIPTION("QDIO base support");
  31 MODULE_LICENSE("GPL");
  32
  33 static inline int do_siga_sync(unsigned long schid,
  34                                unsigned int out_mask, unsigned int in_mask,
  35                                unsigned int fc)
  36 {
  37         register unsigned long __fc asm ("0") = fc;
  38         register unsigned long __schid asm ("1") = schid;
  39         register unsigned long out asm ("2") = out_mask;
  40         register unsigned long in asm ("3") = in_mask;
  41         int cc;
  42
  43         asm volatile(
  44                 "       siga    0\n"
  45                 "       ipm     %0\n"
  46                 "       srl     %0,28\n"
  47                 : "=d" (cc)
  48                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  49         return cc;
  50 }
  51
  52 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  53                                 unsigned int fc)
  54 {
  55         register unsigned long __fc asm ("0") = fc;
  56         register unsigned long __schid asm ("1") = schid;
  57         register unsigned long __mask asm ("2") = mask;
  58         int cc;
  59
  60         asm volatile(
  61                 "       siga    0\n"
  62                 "       ipm     %0\n"
  63                 "       srl     %0,28\n"
  64                 : "=d" (cc)
  65                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  66         return cc;
  67 }
  68
  69 /**
  70  * do_siga_output - perform SIGA-w/wt function
  71  * @schid: subchannel id or in case of QEBSM the subchannel token
  72  * @mask: which output queues to process
  73  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  74  * @fc: function code to perform
  75  * @aob: asynchronous operation block
  76  *
  77  * Returns condition code.
  78  * Note: For IQDC unicast queues only the highest priority queue is processed.
  79  */
  80 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  81                                  unsigned int *bb, unsigned int fc,
  82                                  unsigned long aob)
  83 {
  84         register unsigned long __fc asm("0") = fc;
  85         register unsigned long __schid asm("1") = schid;
  86         register unsigned long __mask asm("2") = mask;
  87         register unsigned long __aob asm("3") = aob;
  88         int cc;
  89
  90         asm volatile(
  91                 "       siga    0\n"
  92                 "       ipm     %0\n"
  93                 "       srl     %0,28\n"
  94                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  95                 : "d" (__schid), "d" (__mask)
  96                 : "cc");
  97         *bb = __fc >> 31;
  98         return cc;
  99 }
 100
 101 /**
 102  * qdio_do_eqbs - extract buffer states for QEBSM
 103  * @q: queue to manipulate
 104  * @state: state of the extracted buffers
 105  * @start: buffer number to start at
 106  * @count: count of buffers to examine
 107  * @auto_ack: automatically acknowledge buffers
 108  *
 109  * Returns the number of successfully extracted equal buffer states.
 110  * Stops processing if a state is different from the last buffers state.
 111  */
 112 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 113                         int start, int count, int auto_ack)
 114 {
 115         int tmp_count = count, tmp_start = start, nr = q->nr;
 116         unsigned int ccq = 0;
 117
 118         qperf_inc(q, eqbs);
 119
 120         if (!q->is_input_q)
 121                 nr += q->irq_ptr->nr_input_qs;
 122 again:
 123         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 124                       auto_ack);
 125
 126         switch (ccq) {
 127         case 0:
 128         case 32:
 129                 /* all done, or next buffer state different */
 130                 return count - tmp_count;
 131         case 96:
 132                 /* not all buffers processed */
 133                 qperf_inc(q, eqbs_partial);
 134                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "EQBS part:%02x",
 135                         tmp_count);
 136                 return count - tmp_count;
 137         case 97:
 138                 /* no buffer processed */
 139                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 140                 goto again;
 141         default:
 142                 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 143                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 144                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 145                 q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE, q->nr,
 146                            q->first_to_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 count,
 314                             unsigned int *busy_bit, 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
 321         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
 322                 if (count > 1)
 323                         fc = QDIO_SIGA_WRITEM;
 324                 else if (aob)
 325                         fc = QDIO_SIGA_WRITEQ;
 326         }
 327
 328         if (is_qebsm(q)) {
 329                 schid = q->irq_ptr->sch_token;
 330                 fc |= QDIO_SIGA_QEBSM_FLAG;
 331         }
 332 again:
 333         cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
 334
 335         /* hipersocket busy condition */
 336         if (unlikely(*busy_bit)) {
 337                 retries++;
 338
 339                 if (!start_time) {
 340                         start_time = get_tod_clock_fast();
 341                         goto again;
 342                 }
 343                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 344                         goto again;
 345         }
 346         if (retries) {
 347                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 348                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 349                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 350         }
 351         return cc;
 352 }
 353
 354 static inline int qdio_siga_input(struct qdio_q *q)
 355 {
 356         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 357         unsigned int fc = QDIO_SIGA_READ;
 358         int cc;
 359
 360         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 361         qperf_inc(q, siga_read);
 362
 363         if (is_qebsm(q)) {
 364                 schid = q->irq_ptr->sch_token;
 365                 fc |= QDIO_SIGA_QEBSM_FLAG;
 366         }
 367
 368         cc = do_siga_input(schid, q->mask, fc);
 369         if (unlikely(cc))
 370                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 371         return (cc) ? -EIO : 0;
 372 }
 373
 374 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 375 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 376
 377 static inline void qdio_sync_queues(struct qdio_q *q)
 378 {
 379         /* PCI capable outbound queues will also be scanned so sync them too */
 380         if (pci_out_supported(q->irq_ptr))
 381                 qdio_siga_sync_all(q);
 382         else
 383                 qdio_siga_sync_q(q);
 384 }
 385
 386 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 387                         unsigned char *state)
 388 {
 389         if (need_siga_sync(q))
 390                 qdio_siga_sync_q(q);
 391         return get_buf_state(q, bufnr, state, 0);
 392 }
 393
 394 static inline void qdio_stop_polling(struct qdio_q *q)
 395 {
 396         if (!q->u.in.polling)
 397                 return;
 398
 399         q->u.in.polling = 0;
 400         qperf_inc(q, stop_polling);
 401
 402         /* show the card that we are not polling anymore */
 403         if (is_qebsm(q)) {
 404                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 405                                q->u.in.ack_count);
 406                 q->u.in.ack_count = 0;
 407         } else
 408                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 409 }
 410
 411 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 412 {
 413         int pos;
 414
 415         q->q_stats.nr_sbal_total += count;
 416         if (count == QDIO_MAX_BUFFERS_MASK) {
 417                 q->q_stats.nr_sbals[7]++;
 418                 return;
 419         }
 420         pos = ilog2(count);
 421         q->q_stats.nr_sbals[pos]++;
 422 }
 423
 424 static void process_buffer_error(struct qdio_q *q, unsigned int start,
 425                                  int count)
 426 {
 427         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 428
 429         /* special handling for no target buffer empty */
 430         if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
 431             q->sbal[start]->element[15].sflags == 0x10) {
 432                 qperf_inc(q, target_full);
 433                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
 434                 return;
 435         }
 436
 437         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 438         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 439         DBF_ERROR("FTC:%3d C:%3d", start, count);
 440         DBF_ERROR("F14:%2x F15:%2x",
 441                   q->sbal[start]->element[14].sflags,
 442                   q->sbal[start]->element[15].sflags);
 443 }
 444
 445 static inline void inbound_primed(struct qdio_q *q, unsigned int start,
 446                                   int count)
 447 {
 448         int new;
 449
 450         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count);
 451
 452         /* for QEBSM the ACK was already set by EQBS */
 453         if (is_qebsm(q)) {
 454                 if (!q->u.in.polling) {
 455                         q->u.in.polling = 1;
 456                         q->u.in.ack_count = count;
 457                         q->u.in.ack_start = start;
 458                         return;
 459                 }
 460
 461                 /* delete the previous ACK's */
 462                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 463                                q->u.in.ack_count);
 464                 q->u.in.ack_count = count;
 465                 q->u.in.ack_start = start;
 466                 return;
 467         }
 468
 469         /*
 470          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 471          * or by the next inbound run.
 472          */
 473         new = add_buf(start, count - 1);
 474         if (q->u.in.polling) {
 475                 /* reset the previous ACK but first set the new one */
 476                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 477                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 478         } else {
 479                 q->u.in.polling = 1;
 480                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 481         }
 482
 483         q->u.in.ack_start = new;
 484         count--;
 485         if (!count)
 486                 return;
 487         /* need to change ALL buffers to get more interrupts */
 488         set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count);
 489 }
 490
 491 static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 492 {
 493         unsigned char state = 0;
 494         int count;
 495
 496         q->timestamp = get_tod_clock_fast();
 497
 498         /*
 499          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 500          * would return 0.
 501          */
 502         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 503         if (!count)
 504                 return 0;
 505
 506         /*
 507          * No siga sync here, as a PCI or we after a thin interrupt
 508          * already sync'ed the queues.
 509          */
 510         count = get_buf_states(q, start, &state, count, 1, 0);
 511         if (!count)
 512                 return 0;
 513
 514         switch (state) {
 515         case SLSB_P_INPUT_PRIMED:
 516                 inbound_primed(q, start, count);
 517                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 518                         qperf_inc(q, inbound_queue_full);
 519                 if (q->irq_ptr->perf_stat_enabled)
 520                         account_sbals(q, count);
 521                 return count;
 522         case SLSB_P_INPUT_ERROR:
 523                 process_buffer_error(q, start, count);
 524                 /*
 525                  * Interrupts may be avoided as long as the error is present
 526                  * so change the buffer state immediately to avoid starvation.
 527                  */
 528                 set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count);
 529                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 530                         qperf_inc(q, inbound_queue_full);
 531                 if (q->irq_ptr->perf_stat_enabled)
 532                         account_sbals_error(q, count);
 533                 return count;
 534         case SLSB_CU_INPUT_EMPTY:
 535         case SLSB_P_INPUT_NOT_INIT:
 536         case SLSB_P_INPUT_ACK:
 537                 if (q->irq_ptr->perf_stat_enabled)
 538                         q->q_stats.nr_sbal_nop++;
 539                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
 540                               q->nr, start);
 541                 return 0;
 542         default:
 543                 WARN_ON_ONCE(1);
 544                 return 0;
 545         }
 546 }
 547
 548 static int qdio_inbound_q_moved(struct qdio_q *q, unsigned int start)
 549 {
 550         int count;
 551
 552         count = get_inbound_buffer_frontier(q, start);
 553
 554         if (count && !is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 555                 q->u.in.timestamp = get_tod_clock();
 556
 557         return count;
 558 }
 559
 560 static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
 561 {
 562         unsigned char state = 0;
 563
 564         if (!atomic_read(&q->nr_buf_used))
 565                 return 1;
 566
 567         if (need_siga_sync(q))
 568                 qdio_siga_sync_q(q);
 569         get_buf_state(q, start, &state, 0);
 570
 571         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 572                 /* more work coming */
 573                 return 0;
 574
 575         if (is_thinint_irq(q->irq_ptr))
 576                 return 1;
 577
 578         /* don't poll under z/VM */
 579         if (MACHINE_IS_VM)
 580                 return 1;
 581
 582         /*
 583          * At this point we know, that inbound first_to_check
 584          * has (probably) not moved (see qdio_inbound_processing).
 585          */
 586         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 587                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", start);
 588                 return 1;
 589         } else
 590                 return 0;
 591 }
 592
 593 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 594 {
 595         unsigned char state = 0;
 596         int j, b = start;
 597
 598         for (j = 0; j < count; ++j) {
 599                 get_buf_state(q, b, &state, 0);
 600                 if (state == SLSB_P_OUTPUT_PENDING) {
 601                         struct qaob *aob = q->u.out.aobs[b];
 602                         if (aob == NULL)
 603                                 continue;
 604
 605                         q->u.out.sbal_state[b].flags |=
 606                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 607                         q->u.out.aobs[b] = NULL;
 608                 }
 609                 b = next_buf(b);
 610         }
 611 }
 612
 613 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 614                                         int bufnr)
 615 {
 616         unsigned long phys_aob = 0;
 617
 618         if (!q->aobs[bufnr]) {
 619                 struct qaob *aob = qdio_allocate_aob();
 620                 q->aobs[bufnr] = aob;
 621         }
 622         if (q->aobs[bufnr]) {
 623                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 624                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 625                 WARN_ON_ONCE(phys_aob & 0xFF);
 626         }
 627
 628         q->sbal_state[bufnr].flags = 0;
 629         return phys_aob;
 630 }
 631
 632 static void qdio_kick_handler(struct qdio_q *q, unsigned int count)
 633 {
 634         int start = q->first_to_kick;
 635
 636         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 637                 return;
 638
 639         if (q->is_input_q) {
 640                 qperf_inc(q, inbound_handler);
 641                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 642         } else {
 643                 qperf_inc(q, outbound_handler);
 644                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 645                               start, count);
 646         }
 647
 648         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 649                    q->irq_ptr->int_parm);
 650
 651         /* for the next time */
 652         q->first_to_kick = add_buf(start, count);
 653         q->qdio_error = 0;
 654 }
 655
 656 static inline int qdio_tasklet_schedule(struct qdio_q *q)
 657 {
 658         if (likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE)) {
 659                 tasklet_schedule(&q->tasklet);
 660                 return 0;
 661         }
 662         return -EPERM;
 663 }
 664
 665 static void __qdio_inbound_processing(struct qdio_q *q)
 666 {
 667         unsigned int start = q->first_to_check;
 668         int count;
 669
 670         qperf_inc(q, tasklet_inbound);
 671
 672         count = qdio_inbound_q_moved(q, start);
 673         if (count == 0)
 674                 return;
 675
 676         start = add_buf(start, count);
 677         q->first_to_check = start;
 678         qdio_kick_handler(q, count);
 679
 680         if (!qdio_inbound_q_done(q, start)) {
 681                 /* means poll time is not yet over */
 682                 qperf_inc(q, tasklet_inbound_resched);
 683                 if (!qdio_tasklet_schedule(q))
 684                         return;
 685         }
 686
 687         qdio_stop_polling(q);
 688         /*
 689          * We need to check again to not lose initiative after
 690          * resetting the ACK state.
 691          */
 692         if (!qdio_inbound_q_done(q, start)) {
 693                 qperf_inc(q, tasklet_inbound_resched2);
 694                 qdio_tasklet_schedule(q);
 695         }
 696 }
 697
 698 void qdio_inbound_processing(unsigned long data)
 699 {
 700         struct qdio_q *q = (struct qdio_q *)data;
 701         __qdio_inbound_processing(q);
 702 }
 703
 704 static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start)
 705 {
 706         unsigned char state = 0;
 707         int count;
 708
 709         q->timestamp = get_tod_clock_fast();
 710
 711         if (need_siga_sync(q))
 712                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 713                     !pci_out_supported(q->irq_ptr)) ||
 714                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 715                     multicast_outbound(q)))
 716                         qdio_siga_sync_q(q);
 717
 718         count = atomic_read(&q->nr_buf_used);
 719         if (!count)
 720                 return 0;
 721
 722         count = get_buf_states(q, start, &state, count, 0, q->u.out.use_cq);
 723         if (!count)
 724                 return 0;
 725
 726         switch (state) {
 727         case SLSB_P_OUTPUT_EMPTY:
 728         case SLSB_P_OUTPUT_PENDING:
 729                 /* the adapter got it */
 730                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 731                         "out empty:%1d %02x", q->nr, count);
 732
 733                 atomic_sub(count, &q->nr_buf_used);
 734                 if (q->irq_ptr->perf_stat_enabled)
 735                         account_sbals(q, count);
 736                 return count;
 737         case SLSB_P_OUTPUT_ERROR:
 738                 process_buffer_error(q, start, count);
 739                 atomic_sub(count, &q->nr_buf_used);
 740                 if (q->irq_ptr->perf_stat_enabled)
 741                         account_sbals_error(q, count);
 742                 return count;
 743         case SLSB_CU_OUTPUT_PRIMED:
 744                 /* the adapter has not fetched the output yet */
 745                 if (q->irq_ptr->perf_stat_enabled)
 746                         q->q_stats.nr_sbal_nop++;
 747                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 748                               q->nr);
 749                 return 0;
 750         case SLSB_P_OUTPUT_NOT_INIT:
 751         case SLSB_P_OUTPUT_HALTED:
 752                 return 0;
 753         default:
 754                 WARN_ON_ONCE(1);
 755                 return 0;
 756         }
 757 }
 758
 759 /* all buffers processed? */
 760 static inline int qdio_outbound_q_done(struct qdio_q *q)
 761 {
 762         return atomic_read(&q->nr_buf_used) == 0;
 763 }
 764
 765 static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
 766 {
 767         int count;
 768
 769         count = get_outbound_buffer_frontier(q, start);
 770
 771         if (count) {
 772                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 773                 if (q->u.out.use_cq)
 774                         qdio_handle_aobs(q, start, count);
 775         }
 776
 777         return count;
 778 }
 779
 780 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
 781                                 unsigned long aob)
 782 {
 783         int retries = 0, cc;
 784         unsigned int busy_bit;
 785
 786         if (!need_siga_out(q))
 787                 return 0;
 788
 789         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 790 retry:
 791         qperf_inc(q, siga_write);
 792
 793         cc = qdio_siga_output(q, count, &busy_bit, aob);
 794         switch (cc) {
 795         case 0:
 796                 break;
 797         case 2:
 798                 if (busy_bit) {
 799                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 800                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 801                                 goto retry;
 802                         }
 803                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 804                         cc = -EBUSY;
 805                 } else {
 806                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 807                         cc = -ENOBUFS;
 808                 }
 809                 break;
 810         case 1:
 811         case 3:
 812                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 813                 cc = -EIO;
 814                 break;
 815         }
 816         if (retries) {
 817                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 818                 DBF_ERROR("count:%u", retries);
 819         }
 820         return cc;
 821 }
 822
 823 static void __qdio_outbound_processing(struct qdio_q *q)
 824 {
 825         unsigned int start = q->first_to_check;
 826         int count;
 827
 828         qperf_inc(q, tasklet_outbound);
 829         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 830
 831         count = qdio_outbound_q_moved(q, start);
 832         if (count) {
 833                 q->first_to_check = add_buf(start, count);
 834                 qdio_kick_handler(q, count);
 835         }
 836
 837         if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
 838             !qdio_outbound_q_done(q))
 839                 goto sched;
 840
 841         if (q->u.out.pci_out_enabled)
 842                 return;
 843
 844         /*
 845          * Now we know that queue type is either qeth without pci enabled
 846          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 847          * is noticed and outbound_handler is called after some time.
 848          */
 849         if (qdio_outbound_q_done(q))
 850                 del_timer_sync(&q->u.out.timer);
 851         else
 852                 if (!timer_pending(&q->u.out.timer) &&
 853                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
 854                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 855         return;
 856
 857 sched:
 858         qdio_tasklet_schedule(q);
 859 }
 860
 861 /* outbound tasklet */
 862 void qdio_outbound_processing(unsigned long data)
 863 {
 864         struct qdio_q *q = (struct qdio_q *)data;
 865         __qdio_outbound_processing(q);
 866 }
 867
 868 void qdio_outbound_timer(struct timer_list *t)
 869 {
 870         struct qdio_q *q = from_timer(q, t, u.out.timer);
 871
 872         qdio_tasklet_schedule(q);
 873 }
 874
 875 static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq)
 876 {
 877         struct qdio_q *out;
 878         int i;
 879
 880         if (!pci_out_supported(irq) || !irq->scan_threshold)
 881                 return;
 882
 883         for_each_output_queue(irq, out, i)
 884                 if (!qdio_outbound_q_done(out))
 885                         qdio_tasklet_schedule(out);
 886 }
 887
 888 static void __tiqdio_inbound_processing(struct qdio_q *q)
 889 {
 890         unsigned int start = q->first_to_check;
 891         int count;
 892
 893         qperf_inc(q, tasklet_inbound);
 894         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 895                 qdio_sync_queues(q);
 896
 897         /* The interrupt could be caused by a PCI request: */
 898         qdio_check_outbound_pci_queues(q->irq_ptr);
 899
 900         count = qdio_inbound_q_moved(q, start);
 901         if (count == 0)
 902                 return;
 903
 904         start = add_buf(start, count);
 905         q->first_to_check = start;
 906         qdio_kick_handler(q, count);
 907
 908         if (!qdio_inbound_q_done(q, start)) {
 909                 qperf_inc(q, tasklet_inbound_resched);
 910                 if (!qdio_tasklet_schedule(q))
 911                         return;
 912         }
 913
 914         qdio_stop_polling(q);
 915         /*
 916          * We need to check again to not lose initiative after
 917          * resetting the ACK state.
 918          */
 919         if (!qdio_inbound_q_done(q, start)) {
 920                 qperf_inc(q, tasklet_inbound_resched2);
 921                 qdio_tasklet_schedule(q);
 922         }
 923 }
 924
 925 void tiqdio_inbound_processing(unsigned long data)
 926 {
 927         struct qdio_q *q = (struct qdio_q *)data;
 928         __tiqdio_inbound_processing(q);
 929 }
 930
 931 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 932                                   enum qdio_irq_states state)
 933 {
 934         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 935
 936         irq_ptr->state = state;
 937         mb();
 938 }
 939
 940 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 941 {
 942         if (irb->esw.esw0.erw.cons) {
 943                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 944                 DBF_ERROR_HEX(irb, 64);
 945                 DBF_ERROR_HEX(irb->ecw, 64);
 946         }
 947 }
 948
 949 /* PCI interrupt handler */
 950 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 951 {
 952         int i;
 953         struct qdio_q *q;
 954
 955         if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 956                 return;
 957
 958         for_each_input_queue(irq_ptr, q, i) {
 959                 if (q->u.in.queue_start_poll) {
 960                         /* skip if polling is enabled or already in work */
 961                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 962                                      &q->u.in.queue_irq_state)) {
 963                                 QDIO_PERF_STAT_INC(irq_ptr, int_discarded);
 964                                 continue;
 965                         }
 966                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 967                                                  q->irq_ptr->int_parm);
 968                 } else {
 969                         tasklet_schedule(&q->tasklet);
 970                 }
 971         }
 972
 973         if (!pci_out_supported(irq_ptr) || !irq_ptr->scan_threshold)
 974                 return;
 975
 976         for_each_output_queue(irq_ptr, q, i) {
 977                 if (qdio_outbound_q_done(q))
 978                         continue;
 979                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
 980                         qdio_siga_sync_q(q);
 981                 qdio_tasklet_schedule(q);
 982         }
 983 }
 984
 985 static void qdio_handle_activate_check(struct ccw_device *cdev,
 986                                 unsigned long intparm, int cstat, int dstat)
 987 {
 988         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 989         struct qdio_q *q;
 990         int count;
 991
 992         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 993         DBF_ERROR("intp :%lx", intparm);
 994         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 995
 996         if (irq_ptr->nr_input_qs) {
 997                 q = irq_ptr->input_qs[0];
 998         } else if (irq_ptr->nr_output_qs) {
 999                 q = irq_ptr->output_qs[0];
1000         } else {
1001                 dump_stack();
1002                 goto no_handler;
1003         }
1004
1005         count = sub_buf(q->first_to_check, q->first_to_kick);
1006         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1007                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1008 no_handler:
1009         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1010         /*
1011          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1012          * Therefore we call the LGR detection function here.
1013          */
1014         lgr_info_log();
1015 }
1016
1017 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1018                                       int dstat)
1019 {
1020         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1021
1022         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1023
1024         if (cstat)
1025                 goto error;
1026         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1027                 goto error;
1028         if (!(dstat & DEV_STAT_DEV_END))
1029                 goto error;
1030         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1031         return;
1032
1033 error:
1034         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1035         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1036         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1037 }
1038
1039 /* qdio interrupt handler */
1040 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1041                       struct irb *irb)
1042 {
1043         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1044         struct subchannel_id schid;
1045         int cstat, dstat;
1046
1047         if (!intparm || !irq_ptr) {
1048                 ccw_device_get_schid(cdev, &schid);
1049                 DBF_ERROR("qint:%4x", schid.sch_no);
1050                 return;
1051         }
1052
1053         if (irq_ptr->perf_stat_enabled)
1054                 irq_ptr->perf_stat.qdio_int++;
1055
1056         if (IS_ERR(irb)) {
1057                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1058                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1059                 wake_up(&cdev->private->wait_q);
1060                 return;
1061         }
1062         qdio_irq_check_sense(irq_ptr, irb);
1063         cstat = irb->scsw.cmd.cstat;
1064         dstat = irb->scsw.cmd.dstat;
1065
1066         switch (irq_ptr->state) {
1067         case QDIO_IRQ_STATE_INACTIVE:
1068                 qdio_establish_handle_irq(cdev, cstat, dstat);
1069                 break;
1070         case QDIO_IRQ_STATE_CLEANUP:
1071                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1072                 break;
1073         case QDIO_IRQ_STATE_ESTABLISHED:
1074         case QDIO_IRQ_STATE_ACTIVE:
1075                 if (cstat & SCHN_STAT_PCI) {
1076                         qdio_int_handler_pci(irq_ptr);
1077                         return;
1078                 }
1079                 if (cstat || dstat)
1080                         qdio_handle_activate_check(cdev, intparm, cstat,
1081                                                    dstat);
1082                 break;
1083         case QDIO_IRQ_STATE_STOPPED:
1084                 break;
1085         default:
1086                 WARN_ON_ONCE(1);
1087         }
1088         wake_up(&cdev->private->wait_q);
1089 }
1090
1091 /**
1092  * qdio_get_ssqd_desc - get qdio subchannel description
1093  * @cdev: ccw device to get description for
1094  * @data: where to store the ssqd
1095  *
1096  * Returns 0 or an error code. The results of the chsc are stored in the
1097  * specified structure.
1098  */
1099 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1100                        struct qdio_ssqd_desc *data)
1101 {
1102         struct subchannel_id schid;
1103
1104         if (!cdev || !cdev->private)
1105                 return -EINVAL;
1106
1107         ccw_device_get_schid(cdev, &schid);
1108         DBF_EVENT("get ssqd:%4x", schid.sch_no);
1109         return qdio_setup_get_ssqd(NULL, &schid, data);
1110 }
1111 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1112
1113 static void qdio_shutdown_queues(struct ccw_device *cdev)
1114 {
1115         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1116         struct qdio_q *q;
1117         int i;
1118
1119         for_each_input_queue(irq_ptr, q, i)
1120                 tasklet_kill(&q->tasklet);
1121
1122         for_each_output_queue(irq_ptr, q, i) {
1123                 del_timer_sync(&q->u.out.timer);
1124                 tasklet_kill(&q->tasklet);
1125         }
1126 }
1127
1128 /**
1129  * qdio_shutdown - shut down a qdio subchannel
1130  * @cdev: associated ccw device
1131  * @how: use halt or clear to shutdown
1132  */
1133 int qdio_shutdown(struct ccw_device *cdev, int how)
1134 {
1135         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1136         struct subchannel_id schid;
1137         int rc;
1138
1139         if (!irq_ptr)
1140                 return -ENODEV;
1141
1142         WARN_ON_ONCE(irqs_disabled());
1143         ccw_device_get_schid(cdev, &schid);
1144         DBF_EVENT("qshutdown:%4x", schid.sch_no);
1145
1146         mutex_lock(&irq_ptr->setup_mutex);
1147         /*
1148          * Subchannel was already shot down. We cannot prevent being called
1149          * twice since cio may trigger a shutdown asynchronously.
1150          */
1151         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1152                 mutex_unlock(&irq_ptr->setup_mutex);
1153                 return 0;
1154         }
1155
1156         /*
1157          * Indicate that the device is going down. Scheduling the queue
1158          * tasklets is forbidden from here on.
1159          */
1160         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1161
1162         tiqdio_remove_device(irq_ptr);
1163         qdio_shutdown_queues(cdev);
1164         qdio_shutdown_debug_entries(irq_ptr);
1165
1166         /* cleanup subchannel */
1167         spin_lock_irq(get_ccwdev_lock(cdev));
1168
1169         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1170                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1171         else
1172                 /* default behaviour is halt */
1173                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1174         if (rc) {
1175                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1176                 DBF_ERROR("rc:%4d", rc);
1177                 goto no_cleanup;
1178         }
1179
1180         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1181         spin_unlock_irq(get_ccwdev_lock(cdev));
1182         wait_event_interruptible_timeout(cdev->private->wait_q,
1183                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1184                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1185                 10 * HZ);
1186         spin_lock_irq(get_ccwdev_lock(cdev));
1187
1188 no_cleanup:
1189         qdio_shutdown_thinint(irq_ptr);
1190
1191         /* restore interrupt handler */
1192         if ((void *)cdev->handler == (void *)qdio_int_handler) {
1193                 cdev->handler = irq_ptr->orig_handler;
1194                 cdev->private->intparm = 0;
1195         }
1196         spin_unlock_irq(get_ccwdev_lock(cdev));
1197
1198         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1199         mutex_unlock(&irq_ptr->setup_mutex);
1200         if (rc)
1201                 return rc;
1202         return 0;
1203 }
1204 EXPORT_SYMBOL_GPL(qdio_shutdown);
1205
1206 /**
1207  * qdio_free - free data structures for a qdio subchannel
1208  * @cdev: associated ccw device
1209  */
1210 int qdio_free(struct ccw_device *cdev)
1211 {
1212         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1213         struct subchannel_id schid;
1214
1215         if (!irq_ptr)
1216                 return -ENODEV;
1217
1218         ccw_device_get_schid(cdev, &schid);
1219         DBF_EVENT("qfree:%4x", schid.sch_no);
1220         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1221         mutex_lock(&irq_ptr->setup_mutex);
1222
1223         irq_ptr->debug_area = NULL;
1224         cdev->private->qdio_data = NULL;
1225         mutex_unlock(&irq_ptr->setup_mutex);
1226
1227         qdio_release_memory(irq_ptr);
1228         return 0;
1229 }
1230 EXPORT_SYMBOL_GPL(qdio_free);
1231
1232 /**
1233  * qdio_allocate - allocate qdio queues and associated data
1234  * @init_data: initialization data
1235  */
1236 int qdio_allocate(struct qdio_initialize *init_data)
1237 {
1238         struct subchannel_id schid;
1239         struct qdio_irq *irq_ptr;
1240
1241         ccw_device_get_schid(init_data->cdev, &schid);
1242         DBF_EVENT("qallocate:%4x", schid.sch_no);
1243
1244         if ((init_data->no_input_qs && !init_data->input_handler) ||
1245             (init_data->no_output_qs && !init_data->output_handler))
1246                 return -EINVAL;
1247
1248         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1249             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1250                 return -EINVAL;
1251
1252         if ((!init_data->input_sbal_addr_array) ||
1253             (!init_data->output_sbal_addr_array))
1254                 return -EINVAL;
1255
1256         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1257         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1258         if (!irq_ptr)
1259                 goto out_err;
1260
1261         mutex_init(&irq_ptr->setup_mutex);
1262         if (qdio_allocate_dbf(init_data, irq_ptr))
1263                 goto out_rel;
1264
1265         /*
1266          * Allocate a page for the chsc calls in qdio_establish.
1267          * Must be pre-allocated since a zfcp recovery will call
1268          * qdio_establish. In case of low memory and swap on a zfcp disk
1269          * we may not be able to allocate memory otherwise.
1270          */
1271         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1272         if (!irq_ptr->chsc_page)
1273                 goto out_rel;
1274
1275         /* qdr is used in ccw1.cda which is u32 */
1276         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1277         if (!irq_ptr->qdr)
1278                 goto out_rel;
1279
1280         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1281                              init_data->no_output_qs))
1282                 goto out_rel;
1283
1284         INIT_LIST_HEAD(&irq_ptr->entry);
1285         init_data->cdev->private->qdio_data = irq_ptr;
1286         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1287         return 0;
1288 out_rel:
1289         qdio_release_memory(irq_ptr);
1290 out_err:
1291         return -ENOMEM;
1292 }
1293 EXPORT_SYMBOL_GPL(qdio_allocate);
1294
1295 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1296 {
1297         struct qdio_q *q = irq_ptr->input_qs[0];
1298         int i, use_cq = 0;
1299
1300         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1301                 use_cq = 1;
1302
1303         for_each_output_queue(irq_ptr, q, i) {
1304                 if (use_cq) {
1305                         if (multicast_outbound(q))
1306                                 continue;
1307                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1308                                 use_cq = 0;
1309                                 continue;
1310                         }
1311                 } else
1312                         qdio_disable_async_operation(&q->u.out);
1313         }
1314         DBF_EVENT("use_cq:%d", use_cq);
1315 }
1316
1317 /**
1318  * qdio_establish - establish queues on a qdio subchannel
1319  * @init_data: initialization data
1320  */
1321 int qdio_establish(struct qdio_initialize *init_data)
1322 {
1323         struct ccw_device *cdev = init_data->cdev;
1324         struct subchannel_id schid;
1325         struct qdio_irq *irq_ptr;
1326         int rc;
1327
1328         ccw_device_get_schid(cdev, &schid);
1329         DBF_EVENT("qestablish:%4x", schid.sch_no);
1330
1331         irq_ptr = cdev->private->qdio_data;
1332         if (!irq_ptr)
1333                 return -ENODEV;
1334
1335         mutex_lock(&irq_ptr->setup_mutex);
1336         qdio_setup_irq(init_data);
1337
1338         rc = qdio_establish_thinint(irq_ptr);
1339         if (rc) {
1340                 mutex_unlock(&irq_ptr->setup_mutex);
1341                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1342                 return rc;
1343         }
1344
1345         /* establish q */
1346         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1347         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1348         irq_ptr->ccw.count = irq_ptr->equeue.count;
1349         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1350
1351         spin_lock_irq(get_ccwdev_lock(cdev));
1352         ccw_device_set_options_mask(cdev, 0);
1353
1354         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1355         spin_unlock_irq(get_ccwdev_lock(cdev));
1356         if (rc) {
1357                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1358                 DBF_ERROR("rc:%4x", rc);
1359                 mutex_unlock(&irq_ptr->setup_mutex);
1360                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1361                 return rc;
1362         }
1363
1364         wait_event_interruptible_timeout(cdev->private->wait_q,
1365                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1366                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1367
1368         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1369                 mutex_unlock(&irq_ptr->setup_mutex);
1370                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1371                 return -EIO;
1372         }
1373
1374         qdio_setup_ssqd_info(irq_ptr);
1375
1376         qdio_detect_hsicq(irq_ptr);
1377
1378         /* qebsm is now setup if available, initialize buffer states */
1379         qdio_init_buf_states(irq_ptr);
1380
1381         mutex_unlock(&irq_ptr->setup_mutex);
1382         qdio_print_subchannel_info(irq_ptr, cdev);
1383         qdio_setup_debug_entries(irq_ptr, cdev);
1384         return 0;
1385 }
1386 EXPORT_SYMBOL_GPL(qdio_establish);
1387
1388 /**
1389  * qdio_activate - activate queues on a qdio subchannel
1390  * @cdev: associated cdev
1391  */
1392 int qdio_activate(struct ccw_device *cdev)
1393 {
1394         struct subchannel_id schid;
1395         struct qdio_irq *irq_ptr;
1396         int rc;
1397
1398         ccw_device_get_schid(cdev, &schid);
1399         DBF_EVENT("qactivate:%4x", schid.sch_no);
1400
1401         irq_ptr = cdev->private->qdio_data;
1402         if (!irq_ptr)
1403                 return -ENODEV;
1404
1405         mutex_lock(&irq_ptr->setup_mutex);
1406         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1407                 rc = -EBUSY;
1408                 goto out;
1409         }
1410
1411         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1412         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1413         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1414         irq_ptr->ccw.cda = 0;
1415
1416         spin_lock_irq(get_ccwdev_lock(cdev));
1417         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1418
1419         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1420                               0, DOIO_DENY_PREFETCH);
1421         spin_unlock_irq(get_ccwdev_lock(cdev));
1422         if (rc) {
1423                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1424                 DBF_ERROR("rc:%4x", rc);
1425                 goto out;
1426         }
1427
1428         if (is_thinint_irq(irq_ptr))
1429                 tiqdio_add_device(irq_ptr);
1430
1431         /* wait for subchannel to become active */
1432         msleep(5);
1433
1434         switch (irq_ptr->state) {
1435         case QDIO_IRQ_STATE_STOPPED:
1436         case QDIO_IRQ_STATE_ERR:
1437                 rc = -EIO;
1438                 break;
1439         default:
1440                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1441                 rc = 0;
1442         }
1443 out:
1444         mutex_unlock(&irq_ptr->setup_mutex);
1445         return rc;
1446 }
1447 EXPORT_SYMBOL_GPL(qdio_activate);
1448
1449 static inline int buf_in_between(int bufnr, int start, int count)
1450 {
1451         int end = add_buf(start, count);
1452
1453         if (end > start) {
1454                 if (bufnr >= start && bufnr < end)
1455                         return 1;
1456                 else
1457                         return 0;
1458         }
1459
1460         /* wrap-around case */
1461         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1462             (bufnr < end))
1463                 return 1;
1464         else
1465                 return 0;
1466 }
1467
1468 /**
1469  * handle_inbound - reset processed input buffers
1470  * @q: queue containing the buffers
1471  * @callflags: flags
1472  * @bufnr: first buffer to process
1473  * @count: how many buffers are emptied
1474  */
1475 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1476                           int bufnr, int count)
1477 {
1478         int diff;
1479
1480         qperf_inc(q, inbound_call);
1481
1482         if (!q->u.in.polling)
1483                 goto set;
1484
1485         /* protect against stop polling setting an ACK for an emptied slsb */
1486         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1487                 /* overwriting everything, just delete polling status */
1488                 q->u.in.polling = 0;
1489                 q->u.in.ack_count = 0;
1490                 goto set;
1491         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1492                 if (is_qebsm(q)) {
1493                         /* partial overwrite, just update ack_start */
1494                         diff = add_buf(bufnr, count);
1495                         diff = sub_buf(diff, q->u.in.ack_start);
1496                         q->u.in.ack_count -= diff;
1497                         if (q->u.in.ack_count <= 0) {
1498                                 q->u.in.polling = 0;
1499                                 q->u.in.ack_count = 0;
1500                                 goto set;
1501                         }
1502                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1503                 }
1504                 else
1505                         /* the only ACK will be deleted, so stop polling */
1506                         q->u.in.polling = 0;
1507         }
1508
1509 set:
1510         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1511         atomic_add(count, &q->nr_buf_used);
1512
1513         if (need_siga_in(q))
1514                 return qdio_siga_input(q);
1515
1516         return 0;
1517 }
1518
1519 /**
1520  * handle_outbound - process filled outbound buffers
1521  * @q: queue containing the buffers
1522  * @callflags: flags
1523  * @bufnr: first buffer to process
1524  * @count: how many buffers are filled
1525  */
1526 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1527                            unsigned int bufnr, unsigned int count)
1528 {
1529         const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
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                 if (q->u.out.use_cq && count == 1)
1551                         phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1552
1553                 rc = qdio_kick_outbound_q(q, count, phys_aob);
1554         } else if (need_siga_sync(q)) {
1555                 rc = qdio_siga_sync_q(q);
1556         } else if (count < QDIO_MAX_BUFFERS_PER_Q &&
1557                    get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
1558                    state == SLSB_CU_OUTPUT_PRIMED) {
1559                 /* The previous buffer is not processed yet, tack on. */
1560                 qperf_inc(q, fast_requeue);
1561         } else {
1562                 rc = qdio_kick_outbound_q(q, count, 0);
1563         }
1564
1565         /* Let drivers implement their own completion scanning: */
1566         if (!scan_threshold)
1567                 return rc;
1568
1569         /* in case of SIGA errors we must process the error immediately */
1570         if (used >= scan_threshold || rc)
1571                 qdio_tasklet_schedule(q);
1572         else
1573                 /* free the SBALs in case of no further traffic */
1574                 if (!timer_pending(&q->u.out.timer) &&
1575                     likely(q->irq_ptr->state == QDIO_IRQ_STATE_ACTIVE))
1576                         mod_timer(&q->u.out.timer, jiffies + HZ);
1577         return rc;
1578 }
1579
1580 /**
1581  * do_QDIO - process input or output buffers
1582  * @cdev: associated ccw_device for the qdio subchannel
1583  * @callflags: input or output and special flags from the program
1584  * @q_nr: queue number
1585  * @bufnr: buffer number
1586  * @count: how many buffers to process
1587  */
1588 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1589             int q_nr, unsigned int bufnr, unsigned int count)
1590 {
1591         struct qdio_irq *irq_ptr;
1592
1593         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1594                 return -EINVAL;
1595
1596         irq_ptr = cdev->private->qdio_data;
1597         if (!irq_ptr)
1598                 return -ENODEV;
1599
1600         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1601                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1602
1603         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1604                 return -EIO;
1605         if (!count)
1606                 return 0;
1607         if (callflags & QDIO_FLAG_SYNC_INPUT)
1608                 return handle_inbound(irq_ptr->input_qs[q_nr],
1609                                       callflags, bufnr, count);
1610         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1611                 return handle_outbound(irq_ptr->output_qs[q_nr],
1612                                        callflags, bufnr, count);
1613         return -EINVAL;
1614 }
1615 EXPORT_SYMBOL_GPL(do_QDIO);
1616
1617 /**
1618  * qdio_start_irq - process input buffers
1619  * @cdev: associated ccw_device for the qdio subchannel
1620  * @nr: input queue number
1621  *
1622  * Return codes
1623  *   0 - success
1624  *   1 - irqs not started since new data is available
1625  */
1626 int qdio_start_irq(struct ccw_device *cdev, int nr)
1627 {
1628         struct qdio_q *q;
1629         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1630
1631         if (!irq_ptr)
1632                 return -ENODEV;
1633         q = irq_ptr->input_qs[nr];
1634
1635         clear_nonshared_ind(irq_ptr);
1636         qdio_stop_polling(q);
1637         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1638
1639         /*
1640          * We need to check again to not lose initiative after
1641          * resetting the ACK state.
1642          */
1643         if (test_nonshared_ind(irq_ptr))
1644                 goto rescan;
1645         if (!qdio_inbound_q_done(q, q->first_to_check))
1646                 goto rescan;
1647         return 0;
1648
1649 rescan:
1650         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1651                              &q->u.in.queue_irq_state))
1652                 return 0;
1653         else
1654                 return 1;
1655
1656 }
1657 EXPORT_SYMBOL(qdio_start_irq);
1658
1659 static int __qdio_inspect_queue(struct qdio_q *q, unsigned int *bufnr,
1660                                 unsigned int *error)
1661 {
1662         unsigned int start = q->first_to_check;
1663         int count;
1664
1665         count = q->is_input_q ? qdio_inbound_q_moved(q, start) :
1666                                 qdio_outbound_q_moved(q, start);
1667         if (count == 0)
1668                 return 0;
1669
1670         *bufnr = start;
1671         *error = q->qdio_error;
1672
1673         /* for the next time */
1674         q->first_to_check = add_buf(start, count);
1675         q->qdio_error = 0;
1676
1677         return count;
1678 }
1679
1680 int qdio_inspect_queue(struct ccw_device *cdev, unsigned int nr, bool is_input,
1681                        unsigned int *bufnr, unsigned int *error)
1682 {
1683         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1684         struct qdio_q *q;
1685
1686         if (!irq_ptr)
1687                 return -ENODEV;
1688         q = is_input ? irq_ptr->input_qs[nr] : irq_ptr->output_qs[nr];
1689
1690         if (need_siga_sync(q))
1691                 qdio_siga_sync_q(q);
1692
1693         return __qdio_inspect_queue(q, bufnr, error);
1694 }
1695 EXPORT_SYMBOL_GPL(qdio_inspect_queue);
1696
1697 /**
1698  * qdio_get_next_buffers - process input buffers
1699  * @cdev: associated ccw_device for the qdio subchannel
1700  * @nr: input queue number
1701  * @bufnr: first filled buffer number
1702  * @error: buffers are in error state
1703  *
1704  * Return codes
1705  *   < 0 - error
1706  *   = 0 - no new buffers found
1707  *   > 0 - number of processed buffers
1708  */
1709 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1710                           int *error)
1711 {
1712         struct qdio_q *q;
1713         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1714
1715         if (!irq_ptr)
1716                 return -ENODEV;
1717         q = irq_ptr->input_qs[nr];
1718
1719         /*
1720          * Cannot rely on automatic sync after interrupt since queues may
1721          * also be examined without interrupt.
1722          */
1723         if (need_siga_sync(q))
1724                 qdio_sync_queues(q);
1725
1726         qdio_check_outbound_pci_queues(irq_ptr);
1727
1728         /* Note: upper-layer MUST stop processing immediately here ... */
1729         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1730                 return -EIO;
1731
1732         return __qdio_inspect_queue(q, bufnr, error);
1733 }
1734 EXPORT_SYMBOL(qdio_get_next_buffers);
1735
1736 /**
1737  * qdio_stop_irq - disable interrupt processing for the device
1738  * @cdev: associated ccw_device for the qdio subchannel
1739  * @nr: input queue number
1740  *
1741  * Return codes
1742  *   0 - interrupts were already disabled
1743  *   1 - interrupts successfully disabled
1744  */
1745 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1746 {
1747         struct qdio_q *q;
1748         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1749
1750         if (!irq_ptr)
1751                 return -ENODEV;
1752         q = irq_ptr->input_qs[nr];
1753
1754         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1755                              &q->u.in.queue_irq_state))
1756                 return 0;
1757         else
1758                 return 1;
1759 }
1760 EXPORT_SYMBOL(qdio_stop_irq);
1761
1762 /**
1763  * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1764  * @schid:              Subchannel ID.
1765  * @cnc:                Boolean Change-Notification Control
1766  * @response:           Response code will be stored at this address
1767  * @cb:                 Callback function will be executed for each element
1768  *                      of the address list
1769  * @priv:               Pointer to pass to the callback function.
1770  *
1771  * Performs "Store-network-bridging-information list" operation and calls
1772  * the callback function for every entry in the list. If "change-
1773  * notification-control" is set, further changes in the address list
1774  * will be reported via the IPA command.
1775  */
1776 int qdio_pnso_brinfo(struct subchannel_id schid,
1777                 int cnc, u16 *response,
1778                 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1779                                 void *entry),
1780                 void *priv)
1781 {
1782         struct chsc_pnso_area *rr;
1783         int rc;
1784         u32 prev_instance = 0;
1785         int isfirstblock = 1;
1786         int i, size, elems;
1787
1788         rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1789         if (rr == NULL)
1790                 return -ENOMEM;
1791         do {
1792                 /* on the first iteration, naihdr.resume_token will be zero */
1793                 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1794                 if (rc != 0 && rc != -EBUSY)
1795                         goto out;
1796                 if (rr->response.code != 1) {
1797                         rc = -EIO;
1798                         continue;
1799                 } else
1800                         rc = 0;
1801
1802                 if (cb == NULL)
1803                         continue;
1804
1805                 size = rr->naihdr.naids;
1806                 elems = (rr->response.length -
1807                                 sizeof(struct chsc_header) -
1808                                 sizeof(struct chsc_brinfo_naihdr)) /
1809                                 size;
1810
1811                 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1812                         /* Inform the caller that they need to scrap */
1813                         /* the data that was already reported via cb */
1814                                 rc = -EAGAIN;
1815                                 break;
1816                 }
1817                 isfirstblock = 0;
1818                 prev_instance = rr->naihdr.instance;
1819                 for (i = 0; i < elems; i++)
1820                         switch (size) {
1821                         case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1822                                 (*cb)(priv, l3_ipv6_addr,
1823                                                 &rr->entries.l3_ipv6[i]);
1824                                 break;
1825                         case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1826                                 (*cb)(priv, l3_ipv4_addr,
1827                                                 &rr->entries.l3_ipv4[i]);
1828                                 break;
1829                         case sizeof(struct qdio_brinfo_entry_l2):
1830                                 (*cb)(priv, l2_addr_lnid,
1831                                                 &rr->entries.l2[i]);
1832                                 break;
1833                         default:
1834                                 WARN_ON_ONCE(1);
1835                                 rc = -EIO;
1836                                 goto out;
1837                         }
1838         } while (rr->response.code == 0x0107 ||  /* channel busy */
1839                   (rr->response.code == 1 && /* list stored */
1840                    /* resume token is non-zero => list incomplete */
1841                    (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1842         (*response) = rr->response.code;
1843
1844 out:
1845         free_page((unsigned long)rr);
1846         return rc;
1847 }
1848 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1849
1850 static int __init init_QDIO(void)
1851 {
1852         int rc;
1853
1854         rc = qdio_debug_init();
1855         if (rc)
1856                 return rc;
1857         rc = qdio_setup_init();
1858         if (rc)
1859                 goto out_debug;
1860         rc = tiqdio_allocate_memory();
1861         if (rc)
1862                 goto out_cache;
1863         rc = tiqdio_register_thinints();
1864         if (rc)
1865                 goto out_ti;
1866         return 0;
1867
1868 out_ti:
1869         tiqdio_free_memory();
1870 out_cache:
1871         qdio_setup_exit();
1872 out_debug:
1873         qdio_debug_exit();
1874         return rc;
1875 }
1876
1877 static void __exit exit_QDIO(void)
1878 {
1879         tiqdio_unregister_thinints();
1880         tiqdio_free_memory();
1881         qdio_setup_exit();
1882         qdio_debug_exit();
1883 }
1884
1885 module_init(init_QDIO);
1886 module_exit(exit_QDIO);