drivers/s390/cio/qdio_main.c

   1 /*
   2  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   3  *
   4  * Copyright IBM Corp. 2000, 2008
   5  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   6  *            Jan Glauber <jang@linux.vnet.ibm.com>
   7  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   8  */
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/timer.h>
  13 #include <linux/delay.h>
  14 #include <linux/gfp.h>
  15 #include <linux/io.h>
  16 #include <linux/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19 #include <asm/ipl.h>
  20
  21 #include "cio.h"
  22 #include "css.h"
  23 #include "device.h"
  24 #include "qdio.h"
  25 #include "qdio_debug.h"
  26
  27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  28         "Jan Glauber <jang@linux.vnet.ibm.com>");
  29 MODULE_DESCRIPTION("QDIO base support");
  30 MODULE_LICENSE("GPL");
  31
  32 static inline int do_siga_sync(unsigned long schid,
  33                                unsigned int out_mask, unsigned int in_mask,
  34                                unsigned int fc)
  35 {
  36         register unsigned long __fc asm ("0") = fc;
  37         register unsigned long __schid asm ("1") = schid;
  38         register unsigned long out asm ("2") = out_mask;
  39         register unsigned long in asm ("3") = in_mask;
  40         int cc;
  41
  42         asm volatile(
  43                 "       siga    0\n"
  44                 "       ipm     %0\n"
  45                 "       srl     %0,28\n"
  46                 : "=d" (cc)
  47                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  48         return cc;
  49 }
  50
  51 static inline int do_siga_input(unsigned long schid, unsigned int mask,
  52                                 unsigned int fc)
  53 {
  54         register unsigned long __fc asm ("0") = fc;
  55         register unsigned long __schid asm ("1") = schid;
  56         register unsigned long __mask asm ("2") = mask;
  57         int cc;
  58
  59         asm volatile(
  60                 "       siga    0\n"
  61                 "       ipm     %0\n"
  62                 "       srl     %0,28\n"
  63                 : "=d" (cc)
  64                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc");
  65         return cc;
  66 }
  67
  68 /**
  69  * do_siga_output - perform SIGA-w/wt function
  70  * @schid: subchannel id or in case of QEBSM the subchannel token
  71  * @mask: which output queues to process
  72  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  73  * @fc: function code to perform
  74  *
  75  * Returns condition code.
  76  * Note: For IQDC unicast queues only the highest priority queue is processed.
  77  */
  78 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  79                                  unsigned int *bb, unsigned int fc,
  80                                  unsigned long aob)
  81 {
  82         register unsigned long __fc asm("0") = fc;
  83         register unsigned long __schid asm("1") = schid;
  84         register unsigned long __mask asm("2") = mask;
  85         register unsigned long __aob asm("3") = aob;
  86         int cc;
  87
  88         asm volatile(
  89                 "       siga    0\n"
  90                 "       ipm     %0\n"
  91                 "       srl     %0,28\n"
  92                 : "=d" (cc), "+d" (__fc), "+d" (__aob)
  93                 : "d" (__schid), "d" (__mask)
  94                 : "cc");
  95         *bb = __fc >> 31;
  96         return cc;
  97 }
  98
  99 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
 100 {
 101         /* all done or next buffer state different */
 102         if (ccq == 0 || ccq == 32)
 103                 return 0;
 104         /* no buffer processed */
 105         if (ccq == 97)
 106                 return 1;
 107         /* not all buffers processed */
 108         if (ccq == 96)
 109                 return 2;
 110         /* notify devices immediately */
 111         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 112         return -EIO;
 113 }
 114
 115 /**
 116  * qdio_do_eqbs - extract buffer states for QEBSM
 117  * @q: queue to manipulate
 118  * @state: state of the extracted buffers
 119  * @start: buffer number to start at
 120  * @count: count of buffers to examine
 121  * @auto_ack: automatically acknowledge buffers
 122  *
 123  * Returns the number of successfully extracted equal buffer states.
 124  * Stops processing if a state is different from the last buffers state.
 125  */
 126 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 127                         int start, int count, int auto_ack)
 128 {
 129         int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
 130         unsigned int ccq = 0;
 131
 132         qperf_inc(q, eqbs);
 133
 134         if (!q->is_input_q)
 135                 nr += q->irq_ptr->nr_input_qs;
 136 again:
 137         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 138                       auto_ack);
 139         rc = qdio_check_ccq(q, ccq);
 140         if (!rc)
 141                 return count - tmp_count;
 142
 143         if (rc == 1) {
 144                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 145                 goto again;
 146         }
 147
 148         if (rc == 2) {
 149                 qperf_inc(q, eqbs_partial);
 150                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
 151                         tmp_count);
 152                 /*
 153                  * Retry once, if that fails bail out and process the
 154                  * extracted buffers before trying again.
 155                  */
 156                 if (!retried++)
 157                         goto again;
 158                 else
 159                         return count - tmp_count;
 160         }
 161
 162         DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 163         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 164         q->handler(q->irq_ptr->cdev, QDIO_ERROR_GET_BUF_STATE,
 165                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 166         return 0;
 167 }
 168
 169 /**
 170  * qdio_do_sqbs - set buffer states for QEBSM
 171  * @q: queue to manipulate
 172  * @state: new state of the buffers
 173  * @start: first buffer number to change
 174  * @count: how many buffers to change
 175  *
 176  * Returns the number of successfully changed buffers.
 177  * Does retrying until the specified count of buffer states is set or an
 178  * error occurs.
 179  */
 180 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 181                         int count)
 182 {
 183         unsigned int ccq = 0;
 184         int tmp_count = count, tmp_start = start;
 185         int nr = q->nr;
 186         int rc;
 187
 188         if (!count)
 189                 return 0;
 190         qperf_inc(q, sqbs);
 191
 192         if (!q->is_input_q)
 193                 nr += q->irq_ptr->nr_input_qs;
 194 again:
 195         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 196         rc = qdio_check_ccq(q, ccq);
 197         if (!rc) {
 198                 WARN_ON_ONCE(tmp_count);
 199                 return count - tmp_count;
 200         }
 201
 202         if (rc == 1 || rc == 2) {
 203                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 204                 qperf_inc(q, sqbs_partial);
 205                 goto again;
 206         }
 207
 208         DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 209         DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 210         q->handler(q->irq_ptr->cdev, QDIO_ERROR_SET_BUF_STATE,
 211                    q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
 212         return 0;
 213 }
 214
 215 /* returns number of examined buffers and their common state in *state */
 216 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 217                                  unsigned char *state, unsigned int count,
 218                                  int auto_ack, int merge_pending)
 219 {
 220         unsigned char __state = 0;
 221         int i;
 222
 223         if (is_qebsm(q))
 224                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 225
 226         for (i = 0; i < count; i++) {
 227                 if (!__state) {
 228                         __state = q->slsb.val[bufnr];
 229                         if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
 230                                 __state = SLSB_P_OUTPUT_EMPTY;
 231                 } else if (merge_pending) {
 232                         if ((q->slsb.val[bufnr] & __state) != __state)
 233                                 break;
 234                 } else if (q->slsb.val[bufnr] != __state)
 235                         break;
 236                 bufnr = next_buf(bufnr);
 237         }
 238         *state = __state;
 239         return i;
 240 }
 241
 242 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 243                                 unsigned char *state, int auto_ack)
 244 {
 245         return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
 246 }
 247
 248 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 249 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 250                                  unsigned char state, int count)
 251 {
 252         int i;
 253
 254         if (is_qebsm(q))
 255                 return qdio_do_sqbs(q, state, bufnr, count);
 256
 257         for (i = 0; i < count; i++) {
 258                 xchg(&q->slsb.val[bufnr], state);
 259                 bufnr = next_buf(bufnr);
 260         }
 261         return count;
 262 }
 263
 264 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 265                                 unsigned char state)
 266 {
 267         return set_buf_states(q, bufnr, state, 1);
 268 }
 269
 270 /* set slsb states to initial state */
 271 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 272 {
 273         struct qdio_q *q;
 274         int i;
 275
 276         for_each_input_queue(irq_ptr, q, i)
 277                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 278                                QDIO_MAX_BUFFERS_PER_Q);
 279         for_each_output_queue(irq_ptr, q, i)
 280                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 281                                QDIO_MAX_BUFFERS_PER_Q);
 282 }
 283
 284 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 285                           unsigned int input)
 286 {
 287         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 288         unsigned int fc = QDIO_SIGA_SYNC;
 289         int cc;
 290
 291         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
 292         qperf_inc(q, siga_sync);
 293
 294         if (is_qebsm(q)) {
 295                 schid = q->irq_ptr->sch_token;
 296                 fc |= QDIO_SIGA_QEBSM_FLAG;
 297         }
 298
 299         cc = do_siga_sync(schid, output, input, fc);
 300         if (unlikely(cc))
 301                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 302         return (cc) ? -EIO : 0;
 303 }
 304
 305 static inline int qdio_siga_sync_q(struct qdio_q *q)
 306 {
 307         if (q->is_input_q)
 308                 return qdio_siga_sync(q, 0, q->mask);
 309         else
 310                 return qdio_siga_sync(q, q->mask, 0);
 311 }
 312
 313 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
 314         unsigned long aob)
 315 {
 316         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 317         unsigned int fc = QDIO_SIGA_WRITE;
 318         u64 start_time = 0;
 319         int retries = 0, cc;
 320         unsigned long laob = 0;
 321
 322         WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
 323                              !q->u.out.use_cq));
 324         if (q->u.out.use_cq && aob != 0) {
 325                 fc = QDIO_SIGA_WRITEQ;
 326                 laob = aob;
 327         }
 328
 329         if (is_qebsm(q)) {
 330                 schid = q->irq_ptr->sch_token;
 331                 fc |= QDIO_SIGA_QEBSM_FLAG;
 332         }
 333 again:
 334         cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
 335
 336         /* hipersocket busy condition */
 337         if (unlikely(*busy_bit)) {
 338                 retries++;
 339
 340                 if (!start_time) {
 341                         start_time = get_tod_clock_fast();
 342                         goto again;
 343                 }
 344                 if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE)
 345                         goto again;
 346         }
 347         if (retries) {
 348                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
 349                               "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
 350                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
 351         }
 352         return cc;
 353 }
 354
 355 static inline int qdio_siga_input(struct qdio_q *q)
 356 {
 357         unsigned long schid = *((u32 *) &q->irq_ptr->schid);
 358         unsigned int fc = QDIO_SIGA_READ;
 359         int cc;
 360
 361         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 362         qperf_inc(q, siga_read);
 363
 364         if (is_qebsm(q)) {
 365                 schid = q->irq_ptr->sch_token;
 366                 fc |= QDIO_SIGA_QEBSM_FLAG;
 367         }
 368
 369         cc = do_siga_input(schid, q->mask, fc);
 370         if (unlikely(cc))
 371                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 372         return (cc) ? -EIO : 0;
 373 }
 374
 375 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
 376 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
 377
 378 static inline void qdio_sync_queues(struct qdio_q *q)
 379 {
 380         /* PCI capable outbound queues will also be scanned so sync them too */
 381         if (pci_out_supported(q))
 382                 qdio_siga_sync_all(q);
 383         else
 384                 qdio_siga_sync_q(q);
 385 }
 386
 387 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
 388                         unsigned char *state)
 389 {
 390         if (need_siga_sync(q))
 391                 qdio_siga_sync_q(q);
 392         return get_buf_states(q, bufnr, state, 1, 0, 0);
 393 }
 394
 395 static inline void qdio_stop_polling(struct qdio_q *q)
 396 {
 397         if (!q->u.in.polling)
 398                 return;
 399
 400         q->u.in.polling = 0;
 401         qperf_inc(q, stop_polling);
 402
 403         /* show the card that we are not polling anymore */
 404         if (is_qebsm(q)) {
 405                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 406                                q->u.in.ack_count);
 407                 q->u.in.ack_count = 0;
 408         } else
 409                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 410 }
 411
 412 static inline void account_sbals(struct qdio_q *q, unsigned int count)
 413 {
 414         int pos;
 415
 416         q->q_stats.nr_sbal_total += count;
 417         if (count == QDIO_MAX_BUFFERS_MASK) {
 418                 q->q_stats.nr_sbals[7]++;
 419                 return;
 420         }
 421         pos = ilog2(count);
 422         q->q_stats.nr_sbals[pos]++;
 423 }
 424
 425 static void process_buffer_error(struct qdio_q *q, int count)
 426 {
 427         unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
 428                                         SLSB_P_OUTPUT_NOT_INIT;
 429
 430         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 431
 432         /* special handling for no target buffer empty */
 433         if ((!q->is_input_q &&
 434             (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
 435                 qperf_inc(q, target_full);
 436                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
 437                               q->first_to_check);
 438                 goto set;
 439         }
 440
 441         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 442         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 443         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 444         DBF_ERROR("F14:%2x F15:%2x",
 445                   q->sbal[q->first_to_check]->element[14].sflags,
 446                   q->sbal[q->first_to_check]->element[15].sflags);
 447
 448 set:
 449         /*
 450          * Interrupts may be avoided as long as the error is present
 451          * so change the buffer state immediately to avoid starvation.
 452          */
 453         set_buf_states(q, q->first_to_check, state, count);
 454 }
 455
 456 static inline void inbound_primed(struct qdio_q *q, int count)
 457 {
 458         int new;
 459
 460         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
 461
 462         /* for QEBSM the ACK was already set by EQBS */
 463         if (is_qebsm(q)) {
 464                 if (!q->u.in.polling) {
 465                         q->u.in.polling = 1;
 466                         q->u.in.ack_count = count;
 467                         q->u.in.ack_start = q->first_to_check;
 468                         return;
 469                 }
 470
 471                 /* delete the previous ACK's */
 472                 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
 473                                q->u.in.ack_count);
 474                 q->u.in.ack_count = count;
 475                 q->u.in.ack_start = q->first_to_check;
 476                 return;
 477         }
 478
 479         /*
 480          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 481          * or by the next inbound run.
 482          */
 483         new = add_buf(q->first_to_check, count - 1);
 484         if (q->u.in.polling) {
 485                 /* reset the previous ACK but first set the new one */
 486                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 487                 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
 488         } else {
 489                 q->u.in.polling = 1;
 490                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 491         }
 492
 493         q->u.in.ack_start = new;
 494         count--;
 495         if (!count)
 496                 return;
 497         /* need to change ALL buffers to get more interrupts */
 498         set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
 499 }
 500
 501 static int get_inbound_buffer_frontier(struct qdio_q *q)
 502 {
 503         int count, stop;
 504         unsigned char state = 0;
 505
 506         q->timestamp = get_tod_clock_fast();
 507
 508         /*
 509          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 510          * would return 0.
 511          */
 512         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 513         stop = add_buf(q->first_to_check, count);
 514
 515         if (q->first_to_check == stop)
 516                 goto out;
 517
 518         /*
 519          * No siga sync here, as a PCI or we after a thin interrupt
 520          * already sync'ed the queues.
 521          */
 522         count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
 523         if (!count)
 524                 goto out;
 525
 526         switch (state) {
 527         case SLSB_P_INPUT_PRIMED:
 528                 inbound_primed(q, count);
 529                 q->first_to_check = add_buf(q->first_to_check, count);
 530                 if (atomic_sub_return(count, &q->nr_buf_used) == 0)
 531                         qperf_inc(q, inbound_queue_full);
 532                 if (q->irq_ptr->perf_stat_enabled)
 533                         account_sbals(q, count);
 534                 break;
 535         case SLSB_P_INPUT_ERROR:
 536                 process_buffer_error(q, count);
 537                 q->first_to_check = add_buf(q->first_to_check, count);
 538                 atomic_sub(count, &q->nr_buf_used);
 539                 if (q->irq_ptr->perf_stat_enabled)
 540                         account_sbals_error(q, count);
 541                 break;
 542         case SLSB_CU_INPUT_EMPTY:
 543         case SLSB_P_INPUT_NOT_INIT:
 544         case SLSB_P_INPUT_ACK:
 545                 if (q->irq_ptr->perf_stat_enabled)
 546                         q->q_stats.nr_sbal_nop++;
 547                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 548                 break;
 549         default:
 550                 WARN_ON_ONCE(1);
 551         }
 552 out:
 553         return q->first_to_check;
 554 }
 555
 556 static int qdio_inbound_q_moved(struct qdio_q *q)
 557 {
 558         int bufnr;
 559
 560         bufnr = get_inbound_buffer_frontier(q);
 561
 562         if (bufnr != q->last_move) {
 563                 q->last_move = bufnr;
 564                 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
 565                         q->u.in.timestamp = get_tod_clock();
 566                 return 1;
 567         } else
 568                 return 0;
 569 }
 570
 571 static inline int qdio_inbound_q_done(struct qdio_q *q)
 572 {
 573         unsigned char state = 0;
 574
 575         if (!atomic_read(&q->nr_buf_used))
 576                 return 1;
 577
 578         if (need_siga_sync(q))
 579                 qdio_siga_sync_q(q);
 580         get_buf_state(q, q->first_to_check, &state, 0);
 581
 582         if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
 583                 /* more work coming */
 584                 return 0;
 585
 586         if (is_thinint_irq(q->irq_ptr))
 587                 return 1;
 588
 589         /* don't poll under z/VM */
 590         if (MACHINE_IS_VM)
 591                 return 1;
 592
 593         /*
 594          * At this point we know, that inbound first_to_check
 595          * has (probably) not moved (see qdio_inbound_processing).
 596          */
 597         if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 598                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
 599                               q->first_to_check);
 600                 return 1;
 601         } else
 602                 return 0;
 603 }
 604
 605 static inline int contains_aobs(struct qdio_q *q)
 606 {
 607         return !q->is_input_q && q->u.out.use_cq;
 608 }
 609
 610 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
 611 {
 612         unsigned char state = 0;
 613         int j, b = start;
 614
 615         if (!contains_aobs(q))
 616                 return;
 617
 618         for (j = 0; j < count; ++j) {
 619                 get_buf_state(q, b, &state, 0);
 620                 if (state == SLSB_P_OUTPUT_PENDING) {
 621                         struct qaob *aob = q->u.out.aobs[b];
 622                         if (aob == NULL)
 623                                 continue;
 624
 625                         q->u.out.sbal_state[b].flags |=
 626                                 QDIO_OUTBUF_STATE_FLAG_PENDING;
 627                         q->u.out.aobs[b] = NULL;
 628                 } else if (state == SLSB_P_OUTPUT_EMPTY) {
 629                         q->u.out.sbal_state[b].aob = NULL;
 630                 }
 631                 b = next_buf(b);
 632         }
 633 }
 634
 635 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
 636                                         int bufnr)
 637 {
 638         unsigned long phys_aob = 0;
 639
 640         if (!q->use_cq)
 641                 goto out;
 642
 643         if (!q->aobs[bufnr]) {
 644                 struct qaob *aob = qdio_allocate_aob();
 645                 q->aobs[bufnr] = aob;
 646         }
 647         if (q->aobs[bufnr]) {
 648                 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
 649                 q->sbal_state[bufnr].aob = q->aobs[bufnr];
 650                 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
 651                 phys_aob = virt_to_phys(q->aobs[bufnr]);
 652                 WARN_ON_ONCE(phys_aob & 0xFF);
 653         }
 654
 655 out:
 656         return phys_aob;
 657 }
 658
 659 static void qdio_kick_handler(struct qdio_q *q)
 660 {
 661         int start = q->first_to_kick;
 662         int end = q->first_to_check;
 663         int count;
 664
 665         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 666                 return;
 667
 668         count = sub_buf(end, start);
 669
 670         if (q->is_input_q) {
 671                 qperf_inc(q, inbound_handler);
 672                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
 673         } else {
 674                 qperf_inc(q, outbound_handler);
 675                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
 676                               start, count);
 677         }
 678
 679         qdio_handle_aobs(q, start, count);
 680
 681         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 682                    q->irq_ptr->int_parm);
 683
 684         /* for the next time */
 685         q->first_to_kick = end;
 686         q->qdio_error = 0;
 687 }
 688
 689 static void __qdio_inbound_processing(struct qdio_q *q)
 690 {
 691         qperf_inc(q, tasklet_inbound);
 692
 693         if (!qdio_inbound_q_moved(q))
 694                 return;
 695
 696         qdio_kick_handler(q);
 697
 698         if (!qdio_inbound_q_done(q)) {
 699                 /* means poll time is not yet over */
 700                 qperf_inc(q, tasklet_inbound_resched);
 701                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 702                         tasklet_schedule(&q->tasklet);
 703                         return;
 704                 }
 705         }
 706
 707         qdio_stop_polling(q);
 708         /*
 709          * We need to check again to not lose initiative after
 710          * resetting the ACK state.
 711          */
 712         if (!qdio_inbound_q_done(q)) {
 713                 qperf_inc(q, tasklet_inbound_resched2);
 714                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 715                         tasklet_schedule(&q->tasklet);
 716         }
 717 }
 718
 719 void qdio_inbound_processing(unsigned long data)
 720 {
 721         struct qdio_q *q = (struct qdio_q *)data;
 722         __qdio_inbound_processing(q);
 723 }
 724
 725 static int get_outbound_buffer_frontier(struct qdio_q *q)
 726 {
 727         int count, stop;
 728         unsigned char state = 0;
 729
 730         q->timestamp = get_tod_clock_fast();
 731
 732         if (need_siga_sync(q))
 733                 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
 734                     !pci_out_supported(q)) ||
 735                     (queue_type(q) == QDIO_IQDIO_QFMT &&
 736                     multicast_outbound(q)))
 737                         qdio_siga_sync_q(q);
 738
 739         /*
 740          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 741          * would return 0.
 742          */
 743         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 744         stop = add_buf(q->first_to_check, count);
 745         if (q->first_to_check == stop)
 746                 goto out;
 747
 748         count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
 749         if (!count)
 750                 goto out;
 751
 752         switch (state) {
 753         case SLSB_P_OUTPUT_EMPTY:
 754                 /* the adapter got it */
 755                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
 756                         "out empty:%1d %02x", q->nr, count);
 757
 758                 atomic_sub(count, &q->nr_buf_used);
 759                 q->first_to_check = add_buf(q->first_to_check, count);
 760                 if (q->irq_ptr->perf_stat_enabled)
 761                         account_sbals(q, count);
 762
 763                 break;
 764         case SLSB_P_OUTPUT_ERROR:
 765                 process_buffer_error(q, count);
 766                 q->first_to_check = add_buf(q->first_to_check, count);
 767                 atomic_sub(count, &q->nr_buf_used);
 768                 if (q->irq_ptr->perf_stat_enabled)
 769                         account_sbals_error(q, count);
 770                 break;
 771         case SLSB_CU_OUTPUT_PRIMED:
 772                 /* the adapter has not fetched the output yet */
 773                 if (q->irq_ptr->perf_stat_enabled)
 774                         q->q_stats.nr_sbal_nop++;
 775                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
 776                               q->nr);
 777                 break;
 778         case SLSB_P_OUTPUT_NOT_INIT:
 779         case SLSB_P_OUTPUT_HALTED:
 780                 break;
 781         default:
 782                 WARN_ON_ONCE(1);
 783         }
 784
 785 out:
 786         return q->first_to_check;
 787 }
 788
 789 /* all buffers processed? */
 790 static inline int qdio_outbound_q_done(struct qdio_q *q)
 791 {
 792         return atomic_read(&q->nr_buf_used) == 0;
 793 }
 794
 795 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 796 {
 797         int bufnr;
 798
 799         bufnr = get_outbound_buffer_frontier(q);
 800
 801         if (bufnr != q->last_move) {
 802                 q->last_move = bufnr;
 803                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 804                 return 1;
 805         } else
 806                 return 0;
 807 }
 808
 809 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
 810 {
 811         int retries = 0, cc;
 812         unsigned int busy_bit;
 813
 814         if (!need_siga_out(q))
 815                 return 0;
 816
 817         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 818 retry:
 819         qperf_inc(q, siga_write);
 820
 821         cc = qdio_siga_output(q, &busy_bit, aob);
 822         switch (cc) {
 823         case 0:
 824                 break;
 825         case 2:
 826                 if (busy_bit) {
 827                         while (++retries < QDIO_BUSY_BIT_RETRIES) {
 828                                 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
 829                                 goto retry;
 830                         }
 831                         DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
 832                         cc = -EBUSY;
 833                 } else {
 834                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
 835                         cc = -ENOBUFS;
 836                 }
 837                 break;
 838         case 1:
 839         case 3:
 840                 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
 841                 cc = -EIO;
 842                 break;
 843         }
 844         if (retries) {
 845                 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
 846                 DBF_ERROR("count:%u", retries);
 847         }
 848         return cc;
 849 }
 850
 851 static void __qdio_outbound_processing(struct qdio_q *q)
 852 {
 853         qperf_inc(q, tasklet_outbound);
 854         WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
 855
 856         if (qdio_outbound_q_moved(q))
 857                 qdio_kick_handler(q);
 858
 859         if (queue_type(q) == QDIO_ZFCP_QFMT)
 860                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 861                         goto sched;
 862
 863         if (q->u.out.pci_out_enabled)
 864                 return;
 865
 866         /*
 867          * Now we know that queue type is either qeth without pci enabled
 868          * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
 869          * is noticed and outbound_handler is called after some time.
 870          */
 871         if (qdio_outbound_q_done(q))
 872                 del_timer(&q->u.out.timer);
 873         else
 874                 if (!timer_pending(&q->u.out.timer))
 875                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 876         return;
 877
 878 sched:
 879         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 880                 return;
 881         tasklet_schedule(&q->tasklet);
 882 }
 883
 884 /* outbound tasklet */
 885 void qdio_outbound_processing(unsigned long data)
 886 {
 887         struct qdio_q *q = (struct qdio_q *)data;
 888         __qdio_outbound_processing(q);
 889 }
 890
 891 void qdio_outbound_timer(unsigned long data)
 892 {
 893         struct qdio_q *q = (struct qdio_q *)data;
 894
 895         if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 896                 return;
 897         tasklet_schedule(&q->tasklet);
 898 }
 899
 900 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
 901 {
 902         struct qdio_q *out;
 903         int i;
 904
 905         if (!pci_out_supported(q))
 906                 return;
 907
 908         for_each_output_queue(q->irq_ptr, out, i)
 909                 if (!qdio_outbound_q_done(out))
 910                         tasklet_schedule(&out->tasklet);
 911 }
 912
 913 static void __tiqdio_inbound_processing(struct qdio_q *q)
 914 {
 915         qperf_inc(q, tasklet_inbound);
 916         if (need_siga_sync(q) && need_siga_sync_after_ai(q))
 917                 qdio_sync_queues(q);
 918
 919         /*
 920          * The interrupt could be caused by a PCI request. Check the
 921          * PCI capable outbound queues.
 922          */
 923         qdio_check_outbound_after_thinint(q);
 924
 925         if (!qdio_inbound_q_moved(q))
 926                 return;
 927
 928         qdio_kick_handler(q);
 929
 930         if (!qdio_inbound_q_done(q)) {
 931                 qperf_inc(q, tasklet_inbound_resched);
 932                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
 933                         tasklet_schedule(&q->tasklet);
 934                         return;
 935                 }
 936         }
 937
 938         qdio_stop_polling(q);
 939         /*
 940          * We need to check again to not lose initiative after
 941          * resetting the ACK state.
 942          */
 943         if (!qdio_inbound_q_done(q)) {
 944                 qperf_inc(q, tasklet_inbound_resched2);
 945                 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
 946                         tasklet_schedule(&q->tasklet);
 947         }
 948 }
 949
 950 void tiqdio_inbound_processing(unsigned long data)
 951 {
 952         struct qdio_q *q = (struct qdio_q *)data;
 953         __tiqdio_inbound_processing(q);
 954 }
 955
 956 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 957                                   enum qdio_irq_states state)
 958 {
 959         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 960
 961         irq_ptr->state = state;
 962         mb();
 963 }
 964
 965 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 966 {
 967         if (irb->esw.esw0.erw.cons) {
 968                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 969                 DBF_ERROR_HEX(irb, 64);
 970                 DBF_ERROR_HEX(irb->ecw, 64);
 971         }
 972 }
 973
 974 /* PCI interrupt handler */
 975 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 976 {
 977         int i;
 978         struct qdio_q *q;
 979
 980         if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
 981                 return;
 982
 983         for_each_input_queue(irq_ptr, q, i) {
 984                 if (q->u.in.queue_start_poll) {
 985                         /* skip if polling is enabled or already in work */
 986                         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
 987                                      &q->u.in.queue_irq_state)) {
 988                                 qperf_inc(q, int_discarded);
 989                                 continue;
 990                         }
 991                         q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
 992                                                  q->irq_ptr->int_parm);
 993                 } else {
 994                         tasklet_schedule(&q->tasklet);
 995                 }
 996         }
 997
 998         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 999                 return;
1000
1001         for_each_output_queue(irq_ptr, q, i) {
1002                 if (qdio_outbound_q_done(q))
1003                         continue;
1004                 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1005                         qdio_siga_sync_q(q);
1006                 tasklet_schedule(&q->tasklet);
1007         }
1008 }
1009
1010 static void qdio_handle_activate_check(struct ccw_device *cdev,
1011                                 unsigned long intparm, int cstat, int dstat)
1012 {
1013         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1014         struct qdio_q *q;
1015         int count;
1016
1017         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1018         DBF_ERROR("intp :%lx", intparm);
1019         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1020
1021         if (irq_ptr->nr_input_qs) {
1022                 q = irq_ptr->input_qs[0];
1023         } else if (irq_ptr->nr_output_qs) {
1024                 q = irq_ptr->output_qs[0];
1025         } else {
1026                 dump_stack();
1027                 goto no_handler;
1028         }
1029
1030         count = sub_buf(q->first_to_check, q->first_to_kick);
1031         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1032                    q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1033 no_handler:
1034         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1035         /*
1036          * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1037          * Therefore we call the LGR detection function here.
1038          */
1039         lgr_info_log();
1040 }
1041
1042 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1043                                       int dstat)
1044 {
1045         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1046
1047         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1048
1049         if (cstat)
1050                 goto error;
1051         if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1052                 goto error;
1053         if (!(dstat & DEV_STAT_DEV_END))
1054                 goto error;
1055         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1056         return;
1057
1058 error:
1059         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1060         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1061         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1062 }
1063
1064 /* qdio interrupt handler */
1065 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1066                       struct irb *irb)
1067 {
1068         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1069         int cstat, dstat;
1070
1071         if (!intparm || !irq_ptr) {
1072                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1073                 return;
1074         }
1075
1076         if (irq_ptr->perf_stat_enabled)
1077                 irq_ptr->perf_stat.qdio_int++;
1078
1079         if (IS_ERR(irb)) {
1080                 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1081                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1082                 wake_up(&cdev->private->wait_q);
1083                 return;
1084         }
1085         qdio_irq_check_sense(irq_ptr, irb);
1086         cstat = irb->scsw.cmd.cstat;
1087         dstat = irb->scsw.cmd.dstat;
1088
1089         switch (irq_ptr->state) {
1090         case QDIO_IRQ_STATE_INACTIVE:
1091                 qdio_establish_handle_irq(cdev, cstat, dstat);
1092                 break;
1093         case QDIO_IRQ_STATE_CLEANUP:
1094                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1095                 break;
1096         case QDIO_IRQ_STATE_ESTABLISHED:
1097         case QDIO_IRQ_STATE_ACTIVE:
1098                 if (cstat & SCHN_STAT_PCI) {
1099                         qdio_int_handler_pci(irq_ptr);
1100                         return;
1101                 }
1102                 if (cstat || dstat)
1103                         qdio_handle_activate_check(cdev, intparm, cstat,
1104                                                    dstat);
1105                 break;
1106         case QDIO_IRQ_STATE_STOPPED:
1107                 break;
1108         default:
1109                 WARN_ON_ONCE(1);
1110         }
1111         wake_up(&cdev->private->wait_q);
1112 }
1113
1114 /**
1115  * qdio_get_ssqd_desc - get qdio subchannel description
1116  * @cdev: ccw device to get description for
1117  * @data: where to store the ssqd
1118  *
1119  * Returns 0 or an error code. The results of the chsc are stored in the
1120  * specified structure.
1121  */
1122 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1123                        struct qdio_ssqd_desc *data)
1124 {
1125
1126         if (!cdev || !cdev->private)
1127                 return -EINVAL;
1128
1129         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1130         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1131 }
1132 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1133
1134 static void qdio_shutdown_queues(struct ccw_device *cdev)
1135 {
1136         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1137         struct qdio_q *q;
1138         int i;
1139
1140         for_each_input_queue(irq_ptr, q, i)
1141                 tasklet_kill(&q->tasklet);
1142
1143         for_each_output_queue(irq_ptr, q, i) {
1144                 del_timer(&q->u.out.timer);
1145                 tasklet_kill(&q->tasklet);
1146         }
1147 }
1148
1149 /**
1150  * qdio_shutdown - shut down a qdio subchannel
1151  * @cdev: associated ccw device
1152  * @how: use halt or clear to shutdown
1153  */
1154 int qdio_shutdown(struct ccw_device *cdev, int how)
1155 {
1156         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1157         int rc;
1158         unsigned long flags;
1159
1160         if (!irq_ptr)
1161                 return -ENODEV;
1162
1163         WARN_ON_ONCE(irqs_disabled());
1164         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1165
1166         mutex_lock(&irq_ptr->setup_mutex);
1167         /*
1168          * Subchannel was already shot down. We cannot prevent being called
1169          * twice since cio may trigger a shutdown asynchronously.
1170          */
1171         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1172                 mutex_unlock(&irq_ptr->setup_mutex);
1173                 return 0;
1174         }
1175
1176         /*
1177          * Indicate that the device is going down. Scheduling the queue
1178          * tasklets is forbidden from here on.
1179          */
1180         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1181
1182         tiqdio_remove_input_queues(irq_ptr);
1183         qdio_shutdown_queues(cdev);
1184         qdio_shutdown_debug_entries(irq_ptr);
1185
1186         /* cleanup subchannel */
1187         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1188
1189         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1190                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1191         else
1192                 /* default behaviour is halt */
1193                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1194         if (rc) {
1195                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1196                 DBF_ERROR("rc:%4d", rc);
1197                 goto no_cleanup;
1198         }
1199
1200         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1201         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1202         wait_event_interruptible_timeout(cdev->private->wait_q,
1203                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1204                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1205                 10 * HZ);
1206         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1207
1208 no_cleanup:
1209         qdio_shutdown_thinint(irq_ptr);
1210
1211         /* restore interrupt handler */
1212         if ((void *)cdev->handler == (void *)qdio_int_handler)
1213                 cdev->handler = irq_ptr->orig_handler;
1214         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1215
1216         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1217         mutex_unlock(&irq_ptr->setup_mutex);
1218         if (rc)
1219                 return rc;
1220         return 0;
1221 }
1222 EXPORT_SYMBOL_GPL(qdio_shutdown);
1223
1224 /**
1225  * qdio_free - free data structures for a qdio subchannel
1226  * @cdev: associated ccw device
1227  */
1228 int qdio_free(struct ccw_device *cdev)
1229 {
1230         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1231
1232         if (!irq_ptr)
1233                 return -ENODEV;
1234
1235         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1236         DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
1237         mutex_lock(&irq_ptr->setup_mutex);
1238
1239         irq_ptr->debug_area = NULL;
1240         cdev->private->qdio_data = NULL;
1241         mutex_unlock(&irq_ptr->setup_mutex);
1242
1243         qdio_release_memory(irq_ptr);
1244         return 0;
1245 }
1246 EXPORT_SYMBOL_GPL(qdio_free);
1247
1248 /**
1249  * qdio_allocate - allocate qdio queues and associated data
1250  * @init_data: initialization data
1251  */
1252 int qdio_allocate(struct qdio_initialize *init_data)
1253 {
1254         struct qdio_irq *irq_ptr;
1255
1256         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1257
1258         if ((init_data->no_input_qs && !init_data->input_handler) ||
1259             (init_data->no_output_qs && !init_data->output_handler))
1260                 return -EINVAL;
1261
1262         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1263             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1264                 return -EINVAL;
1265
1266         if ((!init_data->input_sbal_addr_array) ||
1267             (!init_data->output_sbal_addr_array))
1268                 return -EINVAL;
1269
1270         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1271         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1272         if (!irq_ptr)
1273                 goto out_err;
1274
1275         mutex_init(&irq_ptr->setup_mutex);
1276         if (qdio_allocate_dbf(init_data, irq_ptr))
1277                 goto out_rel;
1278
1279         /*
1280          * Allocate a page for the chsc calls in qdio_establish.
1281          * Must be pre-allocated since a zfcp recovery will call
1282          * qdio_establish. In case of low memory and swap on a zfcp disk
1283          * we may not be able to allocate memory otherwise.
1284          */
1285         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1286         if (!irq_ptr->chsc_page)
1287                 goto out_rel;
1288
1289         /* qdr is used in ccw1.cda which is u32 */
1290         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1291         if (!irq_ptr->qdr)
1292                 goto out_rel;
1293
1294         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1295                              init_data->no_output_qs))
1296                 goto out_rel;
1297
1298         init_data->cdev->private->qdio_data = irq_ptr;
1299         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1300         return 0;
1301 out_rel:
1302         qdio_release_memory(irq_ptr);
1303 out_err:
1304         return -ENOMEM;
1305 }
1306 EXPORT_SYMBOL_GPL(qdio_allocate);
1307
1308 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1309 {
1310         struct qdio_q *q = irq_ptr->input_qs[0];
1311         int i, use_cq = 0;
1312
1313         if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1314                 use_cq = 1;
1315
1316         for_each_output_queue(irq_ptr, q, i) {
1317                 if (use_cq) {
1318                         if (qdio_enable_async_operation(&q->u.out) < 0) {
1319                                 use_cq = 0;
1320                                 continue;
1321                         }
1322                 } else
1323                         qdio_disable_async_operation(&q->u.out);
1324         }
1325         DBF_EVENT("use_cq:%d", use_cq);
1326 }
1327
1328 /**
1329  * qdio_establish - establish queues on a qdio subchannel
1330  * @init_data: initialization data
1331  */
1332 int qdio_establish(struct qdio_initialize *init_data)
1333 {
1334         struct qdio_irq *irq_ptr;
1335         struct ccw_device *cdev = init_data->cdev;
1336         unsigned long saveflags;
1337         int rc;
1338
1339         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1340
1341         irq_ptr = cdev->private->qdio_data;
1342         if (!irq_ptr)
1343                 return -ENODEV;
1344
1345         if (cdev->private->state != DEV_STATE_ONLINE)
1346                 return -EINVAL;
1347
1348         mutex_lock(&irq_ptr->setup_mutex);
1349         qdio_setup_irq(init_data);
1350
1351         rc = qdio_establish_thinint(irq_ptr);
1352         if (rc) {
1353                 mutex_unlock(&irq_ptr->setup_mutex);
1354                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1355                 return rc;
1356         }
1357
1358         /* establish q */
1359         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1360         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1361         irq_ptr->ccw.count = irq_ptr->equeue.count;
1362         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1363
1364         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1365         ccw_device_set_options_mask(cdev, 0);
1366
1367         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1368         if (rc) {
1369                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1370                 DBF_ERROR("rc:%4x", rc);
1371         }
1372         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1373
1374         if (rc) {
1375                 mutex_unlock(&irq_ptr->setup_mutex);
1376                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1377                 return rc;
1378         }
1379
1380         wait_event_interruptible_timeout(cdev->private->wait_q,
1381                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1382                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1383
1384         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1385                 mutex_unlock(&irq_ptr->setup_mutex);
1386                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1387                 return -EIO;
1388         }
1389
1390         qdio_setup_ssqd_info(irq_ptr);
1391
1392         qdio_detect_hsicq(irq_ptr);
1393
1394         /* qebsm is now setup if available, initialize buffer states */
1395         qdio_init_buf_states(irq_ptr);
1396
1397         mutex_unlock(&irq_ptr->setup_mutex);
1398         qdio_print_subchannel_info(irq_ptr, cdev);
1399         qdio_setup_debug_entries(irq_ptr, cdev);
1400         return 0;
1401 }
1402 EXPORT_SYMBOL_GPL(qdio_establish);
1403
1404 /**
1405  * qdio_activate - activate queues on a qdio subchannel
1406  * @cdev: associated cdev
1407  */
1408 int qdio_activate(struct ccw_device *cdev)
1409 {
1410         struct qdio_irq *irq_ptr;
1411         int rc;
1412         unsigned long saveflags;
1413
1414         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1415
1416         irq_ptr = cdev->private->qdio_data;
1417         if (!irq_ptr)
1418                 return -ENODEV;
1419
1420         if (cdev->private->state != DEV_STATE_ONLINE)
1421                 return -EINVAL;
1422
1423         mutex_lock(&irq_ptr->setup_mutex);
1424         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1425                 rc = -EBUSY;
1426                 goto out;
1427         }
1428
1429         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1430         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1431         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1432         irq_ptr->ccw.cda = 0;
1433
1434         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1435         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1436
1437         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1438                               0, DOIO_DENY_PREFETCH);
1439         if (rc) {
1440                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1441                 DBF_ERROR("rc:%4x", rc);
1442         }
1443         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1444
1445         if (rc)
1446                 goto out;
1447
1448         if (is_thinint_irq(irq_ptr))
1449                 tiqdio_add_input_queues(irq_ptr);
1450
1451         /* wait for subchannel to become active */
1452         msleep(5);
1453
1454         switch (irq_ptr->state) {
1455         case QDIO_IRQ_STATE_STOPPED:
1456         case QDIO_IRQ_STATE_ERR:
1457                 rc = -EIO;
1458                 break;
1459         default:
1460                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1461                 rc = 0;
1462         }
1463 out:
1464         mutex_unlock(&irq_ptr->setup_mutex);
1465         return rc;
1466 }
1467 EXPORT_SYMBOL_GPL(qdio_activate);
1468
1469 static inline int buf_in_between(int bufnr, int start, int count)
1470 {
1471         int end = add_buf(start, count);
1472
1473         if (end > start) {
1474                 if (bufnr >= start && bufnr < end)
1475                         return 1;
1476                 else
1477                         return 0;
1478         }
1479
1480         /* wrap-around case */
1481         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1482             (bufnr < end))
1483                 return 1;
1484         else
1485                 return 0;
1486 }
1487
1488 /**
1489  * handle_inbound - reset processed input buffers
1490  * @q: queue containing the buffers
1491  * @callflags: flags
1492  * @bufnr: first buffer to process
1493  * @count: how many buffers are emptied
1494  */
1495 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1496                           int bufnr, int count)
1497 {
1498         int diff;
1499
1500         qperf_inc(q, inbound_call);
1501
1502         if (!q->u.in.polling)
1503                 goto set;
1504
1505         /* protect against stop polling setting an ACK for an emptied slsb */
1506         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1507                 /* overwriting everything, just delete polling status */
1508                 q->u.in.polling = 0;
1509                 q->u.in.ack_count = 0;
1510                 goto set;
1511         } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1512                 if (is_qebsm(q)) {
1513                         /* partial overwrite, just update ack_start */
1514                         diff = add_buf(bufnr, count);
1515                         diff = sub_buf(diff, q->u.in.ack_start);
1516                         q->u.in.ack_count -= diff;
1517                         if (q->u.in.ack_count <= 0) {
1518                                 q->u.in.polling = 0;
1519                                 q->u.in.ack_count = 0;
1520                                 goto set;
1521                         }
1522                         q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1523                 }
1524                 else
1525                         /* the only ACK will be deleted, so stop polling */
1526                         q->u.in.polling = 0;
1527         }
1528
1529 set:
1530         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1531         atomic_add(count, &q->nr_buf_used);
1532
1533         if (need_siga_in(q))
1534                 return qdio_siga_input(q);
1535
1536         return 0;
1537 }
1538
1539 /**
1540  * handle_outbound - process filled outbound buffers
1541  * @q: queue containing the buffers
1542  * @callflags: flags
1543  * @bufnr: first buffer to process
1544  * @count: how many buffers are filled
1545  */
1546 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1547                            int bufnr, int count)
1548 {
1549         unsigned char state = 0;
1550         int used, rc = 0;
1551
1552         qperf_inc(q, outbound_call);
1553
1554         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1555         used = atomic_add_return(count, &q->nr_buf_used);
1556
1557         if (used == QDIO_MAX_BUFFERS_PER_Q)
1558                 qperf_inc(q, outbound_queue_full);
1559
1560         if (callflags & QDIO_FLAG_PCI_OUT) {
1561                 q->u.out.pci_out_enabled = 1;
1562                 qperf_inc(q, pci_request_int);
1563         } else
1564                 q->u.out.pci_out_enabled = 0;
1565
1566         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1567                 unsigned long phys_aob = 0;
1568
1569                 /* One SIGA-W per buffer required for unicast HSI */
1570                 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1571
1572                 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1573
1574                 rc = qdio_kick_outbound_q(q, phys_aob);
1575         } else if (need_siga_sync(q)) {
1576                 rc = qdio_siga_sync_q(q);
1577         } else {
1578                 /* try to fast requeue buffers */
1579                 get_buf_state(q, prev_buf(bufnr), &state, 0);
1580                 if (state != SLSB_CU_OUTPUT_PRIMED)
1581                         rc = qdio_kick_outbound_q(q, 0);
1582                 else
1583                         qperf_inc(q, fast_requeue);
1584         }
1585
1586         /* in case of SIGA errors we must process the error immediately */
1587         if (used >= q->u.out.scan_threshold || rc)
1588                 tasklet_schedule(&q->tasklet);
1589         else
1590                 /* free the SBALs in case of no further traffic */
1591                 if (!timer_pending(&q->u.out.timer))
1592                         mod_timer(&q->u.out.timer, jiffies + HZ);
1593         return rc;
1594 }
1595
1596 /**
1597  * do_QDIO - process input or output buffers
1598  * @cdev: associated ccw_device for the qdio subchannel
1599  * @callflags: input or output and special flags from the program
1600  * @q_nr: queue number
1601  * @bufnr: buffer number
1602  * @count: how many buffers to process
1603  */
1604 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1605             int q_nr, unsigned int bufnr, unsigned int count)
1606 {
1607         struct qdio_irq *irq_ptr;
1608
1609         if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1610                 return -EINVAL;
1611
1612         irq_ptr = cdev->private->qdio_data;
1613         if (!irq_ptr)
1614                 return -ENODEV;
1615
1616         DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1617                       "do%02x b:%02x c:%02x", callflags, bufnr, count);
1618
1619         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1620                 return -EIO;
1621         if (!count)
1622                 return 0;
1623         if (callflags & QDIO_FLAG_SYNC_INPUT)
1624                 return handle_inbound(irq_ptr->input_qs[q_nr],
1625                                       callflags, bufnr, count);
1626         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1627                 return handle_outbound(irq_ptr->output_qs[q_nr],
1628                                        callflags, bufnr, count);
1629         return -EINVAL;
1630 }
1631 EXPORT_SYMBOL_GPL(do_QDIO);
1632
1633 /**
1634  * qdio_start_irq - process input buffers
1635  * @cdev: associated ccw_device for the qdio subchannel
1636  * @nr: input queue number
1637  *
1638  * Return codes
1639  *   0 - success
1640  *   1 - irqs not started since new data is available
1641  */
1642 int qdio_start_irq(struct ccw_device *cdev, int nr)
1643 {
1644         struct qdio_q *q;
1645         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1646
1647         if (!irq_ptr)
1648                 return -ENODEV;
1649         q = irq_ptr->input_qs[nr];
1650
1651         clear_nonshared_ind(irq_ptr);
1652         qdio_stop_polling(q);
1653         clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1654
1655         /*
1656          * We need to check again to not lose initiative after
1657          * resetting the ACK state.
1658          */
1659         if (test_nonshared_ind(irq_ptr))
1660                 goto rescan;
1661         if (!qdio_inbound_q_done(q))
1662                 goto rescan;
1663         return 0;
1664
1665 rescan:
1666         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1667                              &q->u.in.queue_irq_state))
1668                 return 0;
1669         else
1670                 return 1;
1671
1672 }
1673 EXPORT_SYMBOL(qdio_start_irq);
1674
1675 /**
1676  * qdio_get_next_buffers - process input buffers
1677  * @cdev: associated ccw_device for the qdio subchannel
1678  * @nr: input queue number
1679  * @bufnr: first filled buffer number
1680  * @error: buffers are in error state
1681  *
1682  * Return codes
1683  *   < 0 - error
1684  *   = 0 - no new buffers found
1685  *   > 0 - number of processed buffers
1686  */
1687 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1688                           int *error)
1689 {
1690         struct qdio_q *q;
1691         int start, end;
1692         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1693
1694         if (!irq_ptr)
1695                 return -ENODEV;
1696         q = irq_ptr->input_qs[nr];
1697
1698         /*
1699          * Cannot rely on automatic sync after interrupt since queues may
1700          * also be examined without interrupt.
1701          */
1702         if (need_siga_sync(q))
1703                 qdio_sync_queues(q);
1704
1705         /* check the PCI capable outbound queues. */
1706         qdio_check_outbound_after_thinint(q);
1707
1708         if (!qdio_inbound_q_moved(q))
1709                 return 0;
1710
1711         /* Note: upper-layer MUST stop processing immediately here ... */
1712         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1713                 return -EIO;
1714
1715         start = q->first_to_kick;
1716         end = q->first_to_check;
1717         *bufnr = start;
1718         *error = q->qdio_error;
1719
1720         /* for the next time */
1721         q->first_to_kick = end;
1722         q->qdio_error = 0;
1723         return sub_buf(end, start);
1724 }
1725 EXPORT_SYMBOL(qdio_get_next_buffers);
1726
1727 /**
1728  * qdio_stop_irq - disable interrupt processing for the device
1729  * @cdev: associated ccw_device for the qdio subchannel
1730  * @nr: input queue number
1731  *
1732  * Return codes
1733  *   0 - interrupts were already disabled
1734  *   1 - interrupts successfully disabled
1735  */
1736 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1737 {
1738         struct qdio_q *q;
1739         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1740
1741         if (!irq_ptr)
1742                 return -ENODEV;
1743         q = irq_ptr->input_qs[nr];
1744
1745         if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1746                              &q->u.in.queue_irq_state))
1747                 return 0;
1748         else
1749                 return 1;
1750 }
1751 EXPORT_SYMBOL(qdio_stop_irq);
1752
1753 /**
1754  * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1755  * @schid:              Subchannel ID.
1756  * @cnc:                Boolean Change-Notification Control
1757  * @response:           Response code will be stored at this address
1758  * @cb:                 Callback function will be executed for each element
1759  *                      of the address list
1760  * @priv:               Pointer passed from the caller to qdio_pnso_brinfo()
1761  * @type:               Type of the address entry passed to the callback
1762  * @entry:              Entry containg the address of the specified type
1763  * @priv:               Pointer to pass to the callback function.
1764  *
1765  * Performs "Store-network-bridging-information list" operation and calls
1766  * the callback function for every entry in the list. If "change-
1767  * notification-control" is set, further changes in the address list
1768  * will be reported via the IPA command.
1769  */
1770 int qdio_pnso_brinfo(struct subchannel_id schid,
1771                 int cnc, u16 *response,
1772                 void (*cb)(void *priv, enum qdio_brinfo_entry_type type,
1773                                 void *entry),
1774                 void *priv)
1775 {
1776         struct chsc_pnso_area *rr;
1777         int rc;
1778         u32 prev_instance = 0;
1779         int isfirstblock = 1;
1780         int i, size, elems;
1781
1782         rr = (struct chsc_pnso_area *)get_zeroed_page(GFP_KERNEL);
1783         if (rr == NULL)
1784                 return -ENOMEM;
1785         do {
1786                 /* on the first iteration, naihdr.resume_token will be zero */
1787                 rc = chsc_pnso_brinfo(schid, rr, rr->naihdr.resume_token, cnc);
1788                 if (rc != 0 && rc != -EBUSY)
1789                         goto out;
1790                 if (rr->response.code != 1) {
1791                         rc = -EIO;
1792                         continue;
1793                 } else
1794                         rc = 0;
1795
1796                 if (cb == NULL)
1797                         continue;
1798
1799                 size = rr->naihdr.naids;
1800                 elems = (rr->response.length -
1801                                 sizeof(struct chsc_header) -
1802                                 sizeof(struct chsc_brinfo_naihdr)) /
1803                                 size;
1804
1805                 if (!isfirstblock && (rr->naihdr.instance != prev_instance)) {
1806                         /* Inform the caller that they need to scrap */
1807                         /* the data that was already reported via cb */
1808                                 rc = -EAGAIN;
1809                                 break;
1810                 }
1811                 isfirstblock = 0;
1812                 prev_instance = rr->naihdr.instance;
1813                 for (i = 0; i < elems; i++)
1814                         switch (size) {
1815                         case sizeof(struct qdio_brinfo_entry_l3_ipv6):
1816                                 (*cb)(priv, l3_ipv6_addr,
1817                                                 &rr->entries.l3_ipv6[i]);
1818                                 break;
1819                         case sizeof(struct qdio_brinfo_entry_l3_ipv4):
1820                                 (*cb)(priv, l3_ipv4_addr,
1821                                                 &rr->entries.l3_ipv4[i]);
1822                                 break;
1823                         case sizeof(struct qdio_brinfo_entry_l2):
1824                                 (*cb)(priv, l2_addr_lnid,
1825                                                 &rr->entries.l2[i]);
1826                                 break;
1827                         default:
1828                                 WARN_ON_ONCE(1);
1829                                 rc = -EIO;
1830                                 goto out;
1831                         }
1832         } while (rr->response.code == 0x0107 ||  /* channel busy */
1833                   (rr->response.code == 1 && /* list stored */
1834                    /* resume token is non-zero => list incomplete */
1835                    (rr->naihdr.resume_token.t1 || rr->naihdr.resume_token.t2)));
1836         (*response) = rr->response.code;
1837
1838 out:
1839         free_page((unsigned long)rr);
1840         return rc;
1841 }
1842 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo);
1843
1844 static int __init init_QDIO(void)
1845 {
1846         int rc;
1847
1848         rc = qdio_debug_init();
1849         if (rc)
1850                 return rc;
1851         rc = qdio_setup_init();
1852         if (rc)
1853                 goto out_debug;
1854         rc = tiqdio_allocate_memory();
1855         if (rc)
1856                 goto out_cache;
1857         rc = tiqdio_register_thinints();
1858         if (rc)
1859                 goto out_ti;
1860         return 0;
1861
1862 out_ti:
1863         tiqdio_free_memory();
1864 out_cache:
1865         qdio_setup_exit();
1866 out_debug:
1867         qdio_debug_exit();
1868         return rc;
1869 }
1870
1871 static void __exit exit_QDIO(void)
1872 {
1873         tiqdio_unregister_thinints();
1874         tiqdio_free_memory();
1875         qdio_setup_exit();
1876         qdio_debug_exit();
1877 }
1878
1879 module_init(init_QDIO);
1880 module_exit(exit_QDIO);