git.oblomov.eu Git - linux-2.6/blob - drivers/s390/cio/qdio_main.c

   1 /*
   2  * linux/drivers/s390/cio/qdio_main.c
   3  *
   4  * Linux for s390 qdio support, buffer handling, qdio API and module support.
   5  *
   6  * Copyright 2000,2008 IBM Corp.
   7  * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   8  *            Jan Glauber <jang@linux.vnet.ibm.com>
   9  * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include <asm/atomic.h>
  17 #include <asm/debug.h>
  18 #include <asm/qdio.h>
  19
  20 #include "cio.h"
  21 #include "css.h"
  22 #include "device.h"
  23 #include "qdio.h"
  24 #include "qdio_debug.h"
  25 #include "qdio_perf.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(struct subchannel_id schid,
  33                                unsigned int out_mask, unsigned int in_mask)
  34 {
  35         register unsigned long __fc asm ("0") = 2;
  36         register struct subchannel_id __schid asm ("1") = schid;
  37         register unsigned long out asm ("2") = out_mask;
  38         register unsigned long in asm ("3") = in_mask;
  39         int cc;
  40
  41         asm volatile(
  42                 "       siga    0\n"
  43                 "       ipm     %0\n"
  44                 "       srl     %0,28\n"
  45                 : "=d" (cc)
  46                 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  47         return cc;
  48 }
  49
  50 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
  51 {
  52         register unsigned long __fc asm ("0") = 1;
  53         register struct subchannel_id __schid asm ("1") = schid;
  54         register unsigned long __mask asm ("2") = mask;
  55         int cc;
  56
  57         asm volatile(
  58                 "       siga    0\n"
  59                 "       ipm     %0\n"
  60                 "       srl     %0,28\n"
  61                 : "=d" (cc)
  62                 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  63         return cc;
  64 }
  65
  66 /**
  67  * do_siga_output - perform SIGA-w/wt function
  68  * @schid: subchannel id or in case of QEBSM the subchannel token
  69  * @mask: which output queues to process
  70  * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
  71  * @fc: function code to perform
  72  *
  73  * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
  74  * Note: For IQDC unicast queues only the highest priority queue is processed.
  75  */
  76 static inline int do_siga_output(unsigned long schid, unsigned long mask,
  77                                  u32 *bb, unsigned int fc)
  78 {
  79         register unsigned long __fc asm("0") = fc;
  80         register unsigned long __schid asm("1") = schid;
  81         register unsigned long __mask asm("2") = mask;
  82         int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  83
  84         asm volatile(
  85                 "       siga    0\n"
  86                 "0:     ipm     %0\n"
  87                 "       srl     %0,28\n"
  88                 "1:\n"
  89                 EX_TABLE(0b, 1b)
  90                 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
  91                 : : "cc", "memory");
  92         *bb = ((unsigned int) __fc) >> 31;
  93         return cc;
  94 }
  95
  96 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
  97 {
  98         /* all done or next buffer state different */
  99         if (ccq == 0 || ccq == 32)
 100                 return 0;
 101         /* not all buffers processed */
 102         if (ccq == 96 || ccq == 97)
 103                 return 1;
 104         /* notify devices immediately */
 105         DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
 106         return -EIO;
 107 }
 108
 109 /**
 110  * qdio_do_eqbs - extract buffer states for QEBSM
 111  * @q: queue to manipulate
 112  * @state: state of the extracted buffers
 113  * @start: buffer number to start at
 114  * @count: count of buffers to examine
 115  * @auto_ack: automatically acknowledge buffers
 116  *
 117  * Returns the number of successfull extracted equal buffer states.
 118  * Stops processing if a state is different from the last buffers state.
 119  */
 120 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
 121                         int start, int count, int auto_ack)
 122 {
 123         unsigned int ccq = 0;
 124         int tmp_count = count, tmp_start = start;
 125         int nr = q->nr;
 126         int rc;
 127
 128         BUG_ON(!q->irq_ptr->sch_token);
 129         qdio_perf_stat_inc(&perf_stats.debug_eqbs_all);
 130
 131         if (!q->is_input_q)
 132                 nr += q->irq_ptr->nr_input_qs;
 133 again:
 134         ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
 135                       auto_ack);
 136         rc = qdio_check_ccq(q, ccq);
 137
 138         /* At least one buffer was processed, return and extract the remaining
 139          * buffers later.
 140          */
 141         if ((ccq == 96) && (count != tmp_count)) {
 142                 qdio_perf_stat_inc(&perf_stats.debug_eqbs_incomplete);
 143                 return (count - tmp_count);
 144         }
 145
 146         if (rc == 1) {
 147                 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
 148                 goto again;
 149         }
 150
 151         if (rc < 0) {
 152                 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
 153                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 154                 q->handler(q->irq_ptr->cdev,
 155                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 156                            0, -1, -1, q->irq_ptr->int_parm);
 157                 return 0;
 158         }
 159         return count - tmp_count;
 160 }
 161
 162 /**
 163  * qdio_do_sqbs - set buffer states for QEBSM
 164  * @q: queue to manipulate
 165  * @state: new state of the buffers
 166  * @start: first buffer number to change
 167  * @count: how many buffers to change
 168  *
 169  * Returns the number of successfully changed buffers.
 170  * Does retrying until the specified count of buffer states is set or an
 171  * error occurs.
 172  */
 173 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
 174                         int count)
 175 {
 176         unsigned int ccq = 0;
 177         int tmp_count = count, tmp_start = start;
 178         int nr = q->nr;
 179         int rc;
 180
 181         if (!count)
 182                 return 0;
 183
 184         BUG_ON(!q->irq_ptr->sch_token);
 185         qdio_perf_stat_inc(&perf_stats.debug_sqbs_all);
 186
 187         if (!q->is_input_q)
 188                 nr += q->irq_ptr->nr_input_qs;
 189 again:
 190         ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
 191         rc = qdio_check_ccq(q, ccq);
 192         if (rc == 1) {
 193                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
 194                 qdio_perf_stat_inc(&perf_stats.debug_sqbs_incomplete);
 195                 goto again;
 196         }
 197         if (rc < 0) {
 198                 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
 199                 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
 200                 q->handler(q->irq_ptr->cdev,
 201                            QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 202                            0, -1, -1, q->irq_ptr->int_parm);
 203                 return 0;
 204         }
 205         WARN_ON(tmp_count);
 206         return count - tmp_count;
 207 }
 208
 209 /* returns number of examined buffers and their common state in *state */
 210 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
 211                                  unsigned char *state, unsigned int count,
 212                                  int auto_ack)
 213 {
 214         unsigned char __state = 0;
 215         int i;
 216
 217         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 218         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 219
 220         if (is_qebsm(q))
 221                 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
 222
 223         for (i = 0; i < count; i++) {
 224                 if (!__state)
 225                         __state = q->slsb.val[bufnr];
 226                 else if (q->slsb.val[bufnr] != __state)
 227                         break;
 228                 bufnr = next_buf(bufnr);
 229         }
 230         *state = __state;
 231         return i;
 232 }
 233
 234 inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
 235                   unsigned char *state, int auto_ack)
 236 {
 237         return get_buf_states(q, bufnr, state, 1, auto_ack);
 238 }
 239
 240 /* wrap-around safe setting of slsb states, returns number of changed buffers */
 241 static inline int set_buf_states(struct qdio_q *q, int bufnr,
 242                                  unsigned char state, int count)
 243 {
 244         int i;
 245
 246         BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
 247         BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
 248
 249         if (is_qebsm(q))
 250                 return qdio_do_sqbs(q, state, bufnr, count);
 251
 252         for (i = 0; i < count; i++) {
 253                 xchg(&q->slsb.val[bufnr], state);
 254                 bufnr = next_buf(bufnr);
 255         }
 256         return count;
 257 }
 258
 259 static inline int set_buf_state(struct qdio_q *q, int bufnr,
 260                                 unsigned char state)
 261 {
 262         return set_buf_states(q, bufnr, state, 1);
 263 }
 264
 265 /* set slsb states to initial state */
 266 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
 267 {
 268         struct qdio_q *q;
 269         int i;
 270
 271         for_each_input_queue(irq_ptr, q, i)
 272                 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
 273                                QDIO_MAX_BUFFERS_PER_Q);
 274         for_each_output_queue(irq_ptr, q, i)
 275                 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
 276                                QDIO_MAX_BUFFERS_PER_Q);
 277 }
 278
 279 static int qdio_siga_sync(struct qdio_q *q, unsigned int output,
 280                           unsigned int input)
 281 {
 282         int cc;
 283
 284         if (!need_siga_sync(q))
 285                 return 0;
 286
 287         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:");
 288         DBF_DEV_HEX(DBF_INFO, q->irq_ptr, q, sizeof(void *));
 289         qdio_perf_stat_inc(&perf_stats.siga_sync);
 290
 291         cc = do_siga_sync(q->irq_ptr->schid, output, input);
 292         if (cc)
 293                 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
 294         return cc;
 295 }
 296
 297 inline int qdio_siga_sync_q(struct qdio_q *q)
 298 {
 299         if (q->is_input_q)
 300                 return qdio_siga_sync(q, 0, q->mask);
 301         else
 302                 return qdio_siga_sync(q, q->mask, 0);
 303 }
 304
 305 static inline int qdio_siga_sync_out(struct qdio_q *q)
 306 {
 307         return qdio_siga_sync(q, ~0U, 0);
 308 }
 309
 310 static inline int qdio_siga_sync_all(struct qdio_q *q)
 311 {
 312         return qdio_siga_sync(q, ~0U, ~0U);
 313 }
 314
 315 static inline int qdio_do_siga_output(struct qdio_q *q, unsigned int *busy_bit)
 316 {
 317         unsigned int fc = 0;
 318         unsigned long schid;
 319
 320         if (q->u.out.use_enh_siga) {
 321                 fc = 3;
 322         }
 323         if (!is_qebsm(q))
 324                 schid = *((u32 *)&q->irq_ptr->schid);
 325         else {
 326                 schid = q->irq_ptr->sch_token;
 327                 fc |= 0x80;
 328         }
 329         return do_siga_output(schid, q->mask, busy_bit, fc);
 330 }
 331
 332 static int qdio_siga_output(struct qdio_q *q)
 333 {
 334         int cc;
 335         u32 busy_bit;
 336         u64 start_time = 0;
 337
 338         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
 339         qdio_perf_stat_inc(&perf_stats.siga_out);
 340 again:
 341         cc = qdio_do_siga_output(q, &busy_bit);
 342         if (queue_type(q) == QDIO_IQDIO_QFMT && cc == 2 && busy_bit) {
 343                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w bb:%2d", q->nr);
 344
 345                 if (!start_time)
 346                         start_time = get_usecs();
 347                 else if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
 348                         goto again;
 349         }
 350
 351         if (cc == 2 && busy_bit)
 352                 cc |= QDIO_ERROR_SIGA_BUSY;
 353         if (cc)
 354                 DBF_ERROR("%4x SIGA-W:%2d", SCH_NO(q), cc);
 355         return cc;
 356 }
 357
 358 static inline int qdio_siga_input(struct qdio_q *q)
 359 {
 360         int cc;
 361
 362         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
 363         qdio_perf_stat_inc(&perf_stats.siga_in);
 364
 365         cc = do_siga_input(q->irq_ptr->schid, q->mask);
 366         if (cc)
 367                 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
 368         return cc;
 369 }
 370
 371 /* called from thinint inbound handler */
 372 void qdio_sync_after_thinint(struct qdio_q *q)
 373 {
 374         if (pci_out_supported(q)) {
 375                 if (need_siga_sync_thinint(q))
 376                         qdio_siga_sync_all(q);
 377                 else if (need_siga_sync_out_thinint(q))
 378                         qdio_siga_sync_out(q);
 379         } else
 380                 qdio_siga_sync_q(q);
 381 }
 382
 383 inline void qdio_stop_polling(struct qdio_q *q)
 384 {
 385         if (!q->u.in.polling)
 386                 return;
 387
 388         q->u.in.polling = 0;
 389         qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
 390
 391         /* show the card that we are not polling anymore */
 392         if (is_qebsm(q)) {
 393                 set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT,
 394                                q->u.in.ack_count);
 395                 q->u.in.ack_count = 0;
 396         } else
 397                 set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT);
 398 }
 399
 400 static void announce_buffer_error(struct qdio_q *q, int count)
 401 {
 402         q->qdio_error = QDIO_ERROR_SLSB_STATE;
 403
 404         /* special handling for no target buffer empty */
 405         if ((!q->is_input_q &&
 406             (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
 407                 qdio_perf_stat_inc(&perf_stats.outbound_target_full);
 408                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d",
 409                               q->first_to_check);
 410                 return;
 411         }
 412
 413         DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
 414         DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
 415         DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
 416         DBF_ERROR("F14:%2x F15:%2x",
 417                   q->sbal[q->first_to_check]->element[14].flags & 0xff,
 418                   q->sbal[q->first_to_check]->element[15].flags & 0xff);
 419 }
 420
 421 static inline void inbound_primed(struct qdio_q *q, int count)
 422 {
 423         int new;
 424
 425         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count);
 426
 427         /* for QEBSM the ACK was already set by EQBS */
 428         if (is_qebsm(q)) {
 429                 if (!q->u.in.polling) {
 430                         q->u.in.polling = 1;
 431                         q->u.in.ack_count = count;
 432                         q->last_move_ftc = q->first_to_check;
 433                         return;
 434                 }
 435
 436                 /* delete the previous ACK's */
 437                 set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT,
 438                                q->u.in.ack_count);
 439                 q->u.in.ack_count = count;
 440                 q->last_move_ftc = q->first_to_check;
 441                 return;
 442         }
 443
 444         /*
 445          * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
 446          * or by the next inbound run.
 447          */
 448         new = add_buf(q->first_to_check, count - 1);
 449         if (q->u.in.polling) {
 450                 /* reset the previous ACK but first set the new one */
 451                 set_buf_state(q, new, SLSB_P_INPUT_ACK);
 452                 set_buf_state(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT);
 453         }
 454         else {
 455                 q->u.in.polling = 1;
 456                 set_buf_state(q, q->first_to_check, SLSB_P_INPUT_ACK);
 457         }
 458
 459         q->last_move_ftc = new;
 460         count--;
 461         if (!count)
 462                 return;
 463
 464         /*
 465          * Need to change all PRIMED buffers to NOT_INIT, otherwise
 466          * we're loosing initiative in the thinint code.
 467          */
 468         set_buf_states(q, next_buf(q->first_to_check), SLSB_P_INPUT_NOT_INIT,
 469                        count);
 470 }
 471
 472 static int get_inbound_buffer_frontier(struct qdio_q *q)
 473 {
 474         int count, stop;
 475         unsigned char state;
 476
 477         /*
 478          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 479          * would return 0.
 480          */
 481         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 482         stop = add_buf(q->first_to_check, count);
 483
 484         /*
 485          * No siga sync here, as a PCI or we after a thin interrupt
 486          * will sync the queues.
 487          */
 488
 489         /* need to set count to 1 for non-qebsm */
 490         if (!is_qebsm(q))
 491                 count = 1;
 492
 493 check_next:
 494         if (q->first_to_check == stop)
 495                 goto out;
 496
 497         count = get_buf_states(q, q->first_to_check, &state, count, 1);
 498         if (!count)
 499                 goto out;
 500
 501         switch (state) {
 502         case SLSB_P_INPUT_PRIMED:
 503                 inbound_primed(q, count);
 504                 /*
 505                  * No siga-sync needed for non-qebsm here, as the inbound queue
 506                  * will be synced on the next siga-r, resp.
 507                  * tiqdio_is_inbound_q_done will do the siga-sync.
 508                  */
 509                 q->first_to_check = add_buf(q->first_to_check, count);
 510                 atomic_sub(count, &q->nr_buf_used);
 511                 goto check_next;
 512         case SLSB_P_INPUT_ERROR:
 513                 announce_buffer_error(q, count);
 514                 /* process the buffer, the upper layer will take care of it */
 515                 q->first_to_check = add_buf(q->first_to_check, count);
 516                 atomic_sub(count, &q->nr_buf_used);
 517                 break;
 518         case SLSB_CU_INPUT_EMPTY:
 519         case SLSB_P_INPUT_NOT_INIT:
 520         case SLSB_P_INPUT_ACK:
 521                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
 522                 break;
 523         default:
 524                 BUG();
 525         }
 526 out:
 527         return q->first_to_check;
 528 }
 529
 530 int qdio_inbound_q_moved(struct qdio_q *q)
 531 {
 532         int bufnr;
 533
 534         bufnr = get_inbound_buffer_frontier(q);
 535
 536         if ((bufnr != q->last_move_ftc) || q->qdio_error) {
 537                 if (!need_siga_sync(q) && !pci_out_supported(q))
 538                         q->u.in.timestamp = get_usecs();
 539
 540                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in moved");
 541                 return 1;
 542         } else
 543                 return 0;
 544 }
 545
 546 static int qdio_inbound_q_done(struct qdio_q *q)
 547 {
 548         unsigned char state = 0;
 549
 550         if (!atomic_read(&q->nr_buf_used))
 551                 return 1;
 552
 553         /*
 554          * We need that one for synchronization with the adapter, as it
 555          * does a kind of PCI avoidance.
 556          */
 557         qdio_siga_sync_q(q);
 558
 559         get_buf_state(q, q->first_to_check, &state, 0);
 560         if (state == SLSB_P_INPUT_PRIMED)
 561                 /* we got something to do */
 562                 return 0;
 563
 564         /* on VM, we don't poll, so the q is always done here */
 565         if (need_siga_sync(q) || pci_out_supported(q))
 566                 return 1;
 567
 568         /*
 569          * At this point we know, that inbound first_to_check
 570          * has (probably) not moved (see qdio_inbound_processing).
 571          */
 572         if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
 573                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d",
 574                               q->first_to_check);
 575                 return 1;
 576         } else {
 577                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in notd:%3d",
 578                               q->first_to_check);
 579                 return 0;
 580         }
 581 }
 582
 583 void qdio_kick_inbound_handler(struct qdio_q *q)
 584 {
 585         int count, start, end;
 586
 587         qdio_perf_stat_inc(&perf_stats.inbound_handler);
 588
 589         start = q->first_to_kick;
 590         end = q->first_to_check;
 591         if (end >= start)
 592                 count = end - start;
 593         else
 594                 count = end + QDIO_MAX_BUFFERS_PER_Q - start;
 595
 596         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count);
 597
 598         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 599                 return;
 600
 601         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr,
 602                    start, count, q->irq_ptr->int_parm);
 603
 604         /* for the next time */
 605         q->first_to_kick = q->first_to_check;
 606         q->qdio_error = 0;
 607 }
 608
 609 static void __qdio_inbound_processing(struct qdio_q *q)
 610 {
 611         qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
 612 again:
 613         if (!qdio_inbound_q_moved(q))
 614                 return;
 615
 616         qdio_kick_inbound_handler(q);
 617
 618         if (!qdio_inbound_q_done(q))
 619                 /* means poll time is not yet over */
 620                 goto again;
 621
 622         qdio_stop_polling(q);
 623         /*
 624          * We need to check again to not lose initiative after
 625          * resetting the ACK state.
 626          */
 627         if (!qdio_inbound_q_done(q))
 628                 goto again;
 629 }
 630
 631 /* inbound tasklet */
 632 void qdio_inbound_processing(unsigned long data)
 633 {
 634         struct qdio_q *q = (struct qdio_q *)data;
 635         __qdio_inbound_processing(q);
 636 }
 637
 638 static int get_outbound_buffer_frontier(struct qdio_q *q)
 639 {
 640         int count, stop;
 641         unsigned char state;
 642
 643         if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
 644             (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
 645                 qdio_siga_sync_q(q);
 646
 647         /*
 648          * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
 649          * would return 0.
 650          */
 651         count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
 652         stop = add_buf(q->first_to_check, count);
 653
 654         /* need to set count to 1 for non-qebsm */
 655         if (!is_qebsm(q))
 656                 count = 1;
 657
 658 check_next:
 659         if (q->first_to_check == stop)
 660                 return q->first_to_check;
 661
 662         count = get_buf_states(q, q->first_to_check, &state, count, 0);
 663         if (!count)
 664                 return q->first_to_check;
 665
 666         switch (state) {
 667         case SLSB_P_OUTPUT_EMPTY:
 668                 /* the adapter got it */
 669                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count);
 670
 671                 atomic_sub(count, &q->nr_buf_used);
 672                 q->first_to_check = add_buf(q->first_to_check, count);
 673                 /*
 674                  * We fetch all buffer states at once. get_buf_states may
 675                  * return count < stop. For QEBSM we do not loop.
 676                  */
 677                 if (is_qebsm(q))
 678                         break;
 679                 goto check_next;
 680         case SLSB_P_OUTPUT_ERROR:
 681                 announce_buffer_error(q, count);
 682                 /* process the buffer, the upper layer will take care of it */
 683                 q->first_to_check = add_buf(q->first_to_check, count);
 684                 atomic_sub(count, &q->nr_buf_used);
 685                 break;
 686         case SLSB_CU_OUTPUT_PRIMED:
 687                 /* the adapter has not fetched the output yet */
 688                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
 689                 break;
 690         case SLSB_P_OUTPUT_NOT_INIT:
 691         case SLSB_P_OUTPUT_HALTED:
 692                 break;
 693         default:
 694                 BUG();
 695         }
 696         return q->first_to_check;
 697 }
 698
 699 /* all buffers processed? */
 700 static inline int qdio_outbound_q_done(struct qdio_q *q)
 701 {
 702         return atomic_read(&q->nr_buf_used) == 0;
 703 }
 704
 705 static inline int qdio_outbound_q_moved(struct qdio_q *q)
 706 {
 707         int bufnr;
 708
 709         bufnr = get_outbound_buffer_frontier(q);
 710
 711         if ((bufnr != q->last_move_ftc) || q->qdio_error) {
 712                 q->last_move_ftc = bufnr;
 713                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
 714                 return 1;
 715         } else
 716                 return 0;
 717 }
 718
 719 /*
 720  * VM could present us cc=2 and busy bit set on SIGA-write
 721  * during reconfiguration of their Guest LAN (only in iqdio mode,
 722  * otherwise qdio is asynchronous and cc=2 and busy bit there will take
 723  * the queues down immediately).
 724  *
 725  * Therefore qdio_siga_output will try for a short time constantly,
 726  * if such a condition occurs. If it doesn't change, it will
 727  * increase the busy_siga_counter and save the timestamp, and
 728  * schedule the queue for later processing. qdio_outbound_processing
 729  * will check out the counter. If non-zero, it will call qdio_kick_outbound_q
 730  * as often as the value of the counter. This will attempt further SIGA
 731  * instructions. For each successful SIGA, the counter is
 732  * decreased, for failing SIGAs the counter remains the same, after
 733  * all. After some time of no movement, qdio_kick_outbound_q will
 734  * finally fail and reflect corresponding error codes to call
 735  * the upper layer module and have it take the queues down.
 736  *
 737  * Note that this is a change from the original HiperSockets design
 738  * (saying cc=2 and busy bit means take the queues down), but in
 739  * these days Guest LAN didn't exist... excessive cc=2 with busy bit
 740  * conditions will still take the queues down, but the threshold is
 741  * higher due to the Guest LAN environment.
 742  *
 743  * Called from outbound tasklet and do_QDIO handler.
 744  */
 745 static void qdio_kick_outbound_q(struct qdio_q *q)
 746 {
 747         int rc;
 748
 749         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kickoutq:%1d", q->nr);
 750
 751         if (!need_siga_out(q))
 752                 return;
 753
 754         rc = qdio_siga_output(q);
 755         switch (rc) {
 756         case 0:
 757                 /* TODO: improve error handling for CC=0 case */
 758                 if (q->u.out.timestamp)
 759                         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "cc2 rslv:%4x",
 760                                       atomic_read(&q->u.out.busy_siga_counter));
 761                 /* went smooth this time, reset timestamp */
 762                 q->u.out.timestamp = 0;
 763                 break;
 764         /* cc=2 and busy bit */
 765         case (2 | QDIO_ERROR_SIGA_BUSY):
 766                 atomic_inc(&q->u.out.busy_siga_counter);
 767
 768                 /* if the last siga was successful, save timestamp here */
 769                 if (!q->u.out.timestamp)
 770                         q->u.out.timestamp = get_usecs();
 771
 772                 /* if we're in time, don't touch qdio_error */
 773                 if (get_usecs() - q->u.out.timestamp < QDIO_BUSY_BIT_GIVE_UP) {
 774                         tasklet_schedule(&q->tasklet);
 775                         break;
 776                 }
 777                 DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
 778         default:
 779                 /* for plain cc=1, 2 or 3 */
 780                 q->qdio_error = rc;
 781         }
 782 }
 783
 784 static void qdio_kick_outbound_handler(struct qdio_q *q)
 785 {
 786         int start, end, count;
 787
 788         start = q->first_to_kick;
 789         end = q->last_move_ftc;
 790         if (end >= start)
 791                 count = end - start;
 792         else
 793                 count = end + QDIO_MAX_BUFFERS_PER_Q - start;
 794
 795         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kickouth: %1d", q->nr);
 796         DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count);
 797
 798         if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
 799                 return;
 800
 801         q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
 802                    q->irq_ptr->int_parm);
 803
 804         /* for the next time: */
 805         q->first_to_kick = q->last_move_ftc;
 806         q->qdio_error = 0;
 807 }
 808
 809 static void __qdio_outbound_processing(struct qdio_q *q)
 810 {
 811         int siga_attempts;
 812
 813         qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
 814
 815         /* see comment in qdio_kick_outbound_q */
 816         siga_attempts = atomic_read(&q->u.out.busy_siga_counter);
 817         while (siga_attempts--) {
 818                 atomic_dec(&q->u.out.busy_siga_counter);
 819                 qdio_kick_outbound_q(q);
 820         }
 821
 822         BUG_ON(atomic_read(&q->nr_buf_used) < 0);
 823
 824         if (qdio_outbound_q_moved(q))
 825                 qdio_kick_outbound_handler(q);
 826
 827         if (queue_type(q) == QDIO_ZFCP_QFMT) {
 828                 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
 829                         tasklet_schedule(&q->tasklet);
 830                 return;
 831         }
 832
 833         /* bail out for HiperSockets unicast queues */
 834         if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
 835                 return;
 836
 837         if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
 838             (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL) {
 839                 tasklet_schedule(&q->tasklet);
 840                 return;
 841         }
 842
 843         if (q->u.out.pci_out_enabled)
 844                 return;
 845
 846         /*
 847          * Now we know that queue type is either qeth without pci enabled
 848          * or HiperSockets multicast. Make sure buffer switch from PRIMED to
 849          * EMPTY is noticed and outbound_handler is called after some time.
 850          */
 851         if (qdio_outbound_q_done(q))
 852                 del_timer(&q->u.out.timer);
 853         else {
 854                 if (!timer_pending(&q->u.out.timer)) {
 855                         mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
 856                         qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
 857                 }
 858         }
 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(unsigned long data)
 869 {
 870         struct qdio_q *q = (struct qdio_q *)data;
 871         tasklet_schedule(&q->tasklet);
 872 }
 873
 874 /* called from thinint inbound tasklet */
 875 void qdio_check_outbound_after_thinint(struct qdio_q *q)
 876 {
 877         struct qdio_q *out;
 878         int i;
 879
 880         if (!pci_out_supported(q))
 881                 return;
 882
 883         for_each_output_queue(q->irq_ptr, out, i)
 884                 if (!qdio_outbound_q_done(out))
 885                         tasklet_schedule(&out->tasklet);
 886 }
 887
 888 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
 889                                   enum qdio_irq_states state)
 890 {
 891         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
 892
 893         irq_ptr->state = state;
 894         mb();
 895 }
 896
 897 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
 898 {
 899         if (irb->esw.esw0.erw.cons) {
 900                 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
 901                 DBF_ERROR_HEX(irb, 64);
 902                 DBF_ERROR_HEX(irb->ecw, 64);
 903         }
 904 }
 905
 906 /* PCI interrupt handler */
 907 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
 908 {
 909         int i;
 910         struct qdio_q *q;
 911
 912         qdio_perf_stat_inc(&perf_stats.pci_int);
 913
 914         for_each_input_queue(irq_ptr, q, i)
 915                 tasklet_schedule(&q->tasklet);
 916
 917         if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
 918                 return;
 919
 920         for_each_output_queue(irq_ptr, q, i) {
 921                 if (qdio_outbound_q_done(q))
 922                         continue;
 923
 924                 if (!siga_syncs_out_pci(q))
 925                         qdio_siga_sync_q(q);
 926
 927                 tasklet_schedule(&q->tasklet);
 928         }
 929 }
 930
 931 static void qdio_handle_activate_check(struct ccw_device *cdev,
 932                                 unsigned long intparm, int cstat, int dstat)
 933 {
 934         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 935         struct qdio_q *q;
 936
 937         DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
 938         DBF_ERROR("intp :%lx", intparm);
 939         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
 940
 941         if (irq_ptr->nr_input_qs) {
 942                 q = irq_ptr->input_qs[0];
 943         } else if (irq_ptr->nr_output_qs) {
 944                 q = irq_ptr->output_qs[0];
 945         } else {
 946                 dump_stack();
 947                 goto no_handler;
 948         }
 949         q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
 950                    0, -1, -1, irq_ptr->int_parm);
 951 no_handler:
 952         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 953 }
 954
 955 static void qdio_call_shutdown(struct work_struct *work)
 956 {
 957         struct ccw_device_private *priv;
 958         struct ccw_device *cdev;
 959
 960         priv = container_of(work, struct ccw_device_private, kick_work);
 961         cdev = priv->cdev;
 962         qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
 963         put_device(&cdev->dev);
 964 }
 965
 966 static void qdio_int_error(struct ccw_device *cdev)
 967 {
 968         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 969
 970         switch (irq_ptr->state) {
 971         case QDIO_IRQ_STATE_INACTIVE:
 972         case QDIO_IRQ_STATE_CLEANUP:
 973                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
 974                 break;
 975         case QDIO_IRQ_STATE_ESTABLISHED:
 976         case QDIO_IRQ_STATE_ACTIVE:
 977                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
 978                 if (get_device(&cdev->dev)) {
 979                         /* Can't call shutdown from interrupt context. */
 980                         PREPARE_WORK(&cdev->private->kick_work,
 981                                      qdio_call_shutdown);
 982                         queue_work(ccw_device_work, &cdev->private->kick_work);
 983                 }
 984                 break;
 985         default:
 986                 WARN_ON(1);
 987         }
 988         wake_up(&cdev->private->wait_q);
 989 }
 990
 991 static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat,
 992                                        int dstat)
 993 {
 994         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
 995
 996         if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
 997                 DBF_ERROR("EQ:ck con");
 998                 goto error;
 999         }
1000
1001         if (!(dstat & DEV_STAT_DEV_END)) {
1002                 DBF_ERROR("EQ:no dev");
1003                 goto error;
1004         }
1005
1006         if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) {
1007                 DBF_ERROR("EQ: bad io");
1008                 goto error;
1009         }
1010         return 0;
1011 error:
1012         DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1013         DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1014
1015         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1016         return 1;
1017 }
1018
1019 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1020                                       int dstat)
1021 {
1022         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1023
1024         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1025         if (!qdio_establish_check_errors(cdev, cstat, dstat))
1026                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1027 }
1028
1029 /* qdio interrupt handler */
1030 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1031                       struct irb *irb)
1032 {
1033         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1034         int cstat, dstat;
1035
1036         qdio_perf_stat_inc(&perf_stats.qdio_int);
1037
1038         if (!intparm || !irq_ptr) {
1039                 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1040                 return;
1041         }
1042
1043         if (IS_ERR(irb)) {
1044                 switch (PTR_ERR(irb)) {
1045                 case -EIO:
1046                         DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1047                         return;
1048                 case -ETIMEDOUT:
1049                         DBF_ERROR("%4x IO timeout", irq_ptr->schid.sch_no);
1050                         qdio_int_error(cdev);
1051                         return;
1052                 default:
1053                         WARN_ON(1);
1054                         return;
1055                 }
1056         }
1057         qdio_irq_check_sense(irq_ptr, irb);
1058
1059         cstat = irb->scsw.cmd.cstat;
1060         dstat = irb->scsw.cmd.dstat;
1061
1062         switch (irq_ptr->state) {
1063         case QDIO_IRQ_STATE_INACTIVE:
1064                 qdio_establish_handle_irq(cdev, cstat, dstat);
1065                 break;
1066
1067         case QDIO_IRQ_STATE_CLEANUP:
1068                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1069                 break;
1070
1071         case QDIO_IRQ_STATE_ESTABLISHED:
1072         case QDIO_IRQ_STATE_ACTIVE:
1073                 if (cstat & SCHN_STAT_PCI) {
1074                         qdio_int_handler_pci(irq_ptr);
1075                         /* no state change so no need to wake up wait_q */
1076                         return;
1077                 }
1078                 if ((cstat & ~SCHN_STAT_PCI) || dstat) {
1079                         qdio_handle_activate_check(cdev, intparm, cstat,
1080                                                    dstat);
1081                         break;
1082                 }
1083         default:
1084                 WARN_ON(1);
1085         }
1086         wake_up(&cdev->private->wait_q);
1087 }
1088
1089 /**
1090  * qdio_get_ssqd_desc - get qdio subchannel description
1091  * @cdev: ccw device to get description for
1092  * @data: where to store the ssqd
1093  *
1094  * Returns 0 or an error code. The results of the chsc are stored in the
1095  * specified structure.
1096  */
1097 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1098                        struct qdio_ssqd_desc *data)
1099 {
1100
1101         if (!cdev || !cdev->private)
1102                 return -EINVAL;
1103
1104         DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1105         return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1106 }
1107 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1108
1109 /**
1110  * qdio_cleanup - shutdown queues and free data structures
1111  * @cdev: associated ccw device
1112  * @how: use halt or clear to shutdown
1113  *
1114  * This function calls qdio_shutdown() for @cdev with method @how
1115  * and on success qdio_free() for @cdev.
1116  */
1117 int qdio_cleanup(struct ccw_device *cdev, int how)
1118 {
1119         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1120         int rc;
1121
1122         if (!irq_ptr)
1123                 return -ENODEV;
1124
1125         rc = qdio_shutdown(cdev, how);
1126         if (rc == 0)
1127                 rc = qdio_free(cdev);
1128         return rc;
1129 }
1130 EXPORT_SYMBOL_GPL(qdio_cleanup);
1131
1132 static void qdio_shutdown_queues(struct ccw_device *cdev)
1133 {
1134         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1135         struct qdio_q *q;
1136         int i;
1137
1138         for_each_input_queue(irq_ptr, q, i)
1139                 tasklet_disable(&q->tasklet);
1140
1141         for_each_output_queue(irq_ptr, q, i) {
1142                 tasklet_disable(&q->tasklet);
1143                 del_timer(&q->u.out.timer);
1144         }
1145 }
1146
1147 /**
1148  * qdio_shutdown - shut down a qdio subchannel
1149  * @cdev: associated ccw device
1150  * @how: use halt or clear to shutdown
1151  */
1152 int qdio_shutdown(struct ccw_device *cdev, int how)
1153 {
1154         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1155         int rc;
1156         unsigned long flags;
1157
1158         if (!irq_ptr)
1159                 return -ENODEV;
1160
1161         DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1162
1163         mutex_lock(&irq_ptr->setup_mutex);
1164         /*
1165          * Subchannel was already shot down. We cannot prevent being called
1166          * twice since cio may trigger a shutdown asynchronously.
1167          */
1168         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1169                 mutex_unlock(&irq_ptr->setup_mutex);
1170                 return 0;
1171         }
1172
1173         tiqdio_remove_input_queues(irq_ptr);
1174         qdio_shutdown_queues(cdev);
1175         qdio_shutdown_debug_entries(irq_ptr, cdev);
1176
1177         /* cleanup subchannel */
1178         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1179
1180         if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1181                 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1182         else
1183                 /* default behaviour is halt */
1184                 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1185         if (rc) {
1186                 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1187                 DBF_ERROR("rc:%4d", rc);
1188                 goto no_cleanup;
1189         }
1190
1191         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1192         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1193         wait_event_interruptible_timeout(cdev->private->wait_q,
1194                 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1195                 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1196                 10 * HZ);
1197         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1198
1199 no_cleanup:
1200         qdio_shutdown_thinint(irq_ptr);
1201
1202         /* restore interrupt handler */
1203         if ((void *)cdev->handler == (void *)qdio_int_handler)
1204                 cdev->handler = irq_ptr->orig_handler;
1205         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1206
1207         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1208         mutex_unlock(&irq_ptr->setup_mutex);
1209         if (rc)
1210                 return rc;
1211         return 0;
1212 }
1213 EXPORT_SYMBOL_GPL(qdio_shutdown);
1214
1215 /**
1216  * qdio_free - free data structures for a qdio subchannel
1217  * @cdev: associated ccw device
1218  */
1219 int qdio_free(struct ccw_device *cdev)
1220 {
1221         struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1222
1223         if (!irq_ptr)
1224                 return -ENODEV;
1225
1226         DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1227         mutex_lock(&irq_ptr->setup_mutex);
1228
1229         if (irq_ptr->debug_area != NULL) {
1230                 debug_unregister(irq_ptr->debug_area);
1231                 irq_ptr->debug_area = NULL;
1232         }
1233         cdev->private->qdio_data = NULL;
1234         mutex_unlock(&irq_ptr->setup_mutex);
1235
1236         qdio_release_memory(irq_ptr);
1237         return 0;
1238 }
1239 EXPORT_SYMBOL_GPL(qdio_free);
1240
1241 /**
1242  * qdio_initialize - allocate and establish queues for a qdio subchannel
1243  * @init_data: initialization data
1244  *
1245  * This function first allocates queues via qdio_allocate() and on success
1246  * establishes them via qdio_establish().
1247  */
1248 int qdio_initialize(struct qdio_initialize *init_data)
1249 {
1250         int rc;
1251
1252         rc = qdio_allocate(init_data);
1253         if (rc)
1254                 return rc;
1255
1256         rc = qdio_establish(init_data);
1257         if (rc)
1258                 qdio_free(init_data->cdev);
1259         return rc;
1260 }
1261 EXPORT_SYMBOL_GPL(qdio_initialize);
1262
1263 /**
1264  * qdio_allocate - allocate qdio queues and associated data
1265  * @init_data: initialization data
1266  */
1267 int qdio_allocate(struct qdio_initialize *init_data)
1268 {
1269         struct qdio_irq *irq_ptr;
1270
1271         DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1272
1273         if ((init_data->no_input_qs && !init_data->input_handler) ||
1274             (init_data->no_output_qs && !init_data->output_handler))
1275                 return -EINVAL;
1276
1277         if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1278             (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1279                 return -EINVAL;
1280
1281         if ((!init_data->input_sbal_addr_array) ||
1282             (!init_data->output_sbal_addr_array))
1283                 return -EINVAL;
1284
1285         /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1286         irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1287         if (!irq_ptr)
1288                 goto out_err;
1289
1290         mutex_init(&irq_ptr->setup_mutex);
1291         qdio_allocate_dbf(init_data, irq_ptr);
1292
1293         /*
1294          * Allocate a page for the chsc calls in qdio_establish.
1295          * Must be pre-allocated since a zfcp recovery will call
1296          * qdio_establish. In case of low memory and swap on a zfcp disk
1297          * we may not be able to allocate memory otherwise.
1298          */
1299         irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1300         if (!irq_ptr->chsc_page)
1301                 goto out_rel;
1302
1303         /* qdr is used in ccw1.cda which is u32 */
1304         irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1305         if (!irq_ptr->qdr)
1306                 goto out_rel;
1307         WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1308
1309         if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1310                              init_data->no_output_qs))
1311                 goto out_rel;
1312
1313         init_data->cdev->private->qdio_data = irq_ptr;
1314         qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1315         return 0;
1316 out_rel:
1317         qdio_release_memory(irq_ptr);
1318 out_err:
1319         return -ENOMEM;
1320 }
1321 EXPORT_SYMBOL_GPL(qdio_allocate);
1322
1323 /**
1324  * qdio_establish - establish queues on a qdio subchannel
1325  * @init_data: initialization data
1326  */
1327 int qdio_establish(struct qdio_initialize *init_data)
1328 {
1329         struct qdio_irq *irq_ptr;
1330         struct ccw_device *cdev = init_data->cdev;
1331         unsigned long saveflags;
1332         int rc;
1333
1334         DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1335
1336         irq_ptr = cdev->private->qdio_data;
1337         if (!irq_ptr)
1338                 return -ENODEV;
1339
1340         if (cdev->private->state != DEV_STATE_ONLINE)
1341                 return -EINVAL;
1342
1343         mutex_lock(&irq_ptr->setup_mutex);
1344         qdio_setup_irq(init_data);
1345
1346         rc = qdio_establish_thinint(irq_ptr);
1347         if (rc) {
1348                 mutex_unlock(&irq_ptr->setup_mutex);
1349                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1350                 return rc;
1351         }
1352
1353         /* establish q */
1354         irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1355         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1356         irq_ptr->ccw.count = irq_ptr->equeue.count;
1357         irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1358
1359         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1360         ccw_device_set_options_mask(cdev, 0);
1361
1362         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1363         if (rc) {
1364                 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1365                 DBF_ERROR("rc:%4x", rc);
1366         }
1367         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1368
1369         if (rc) {
1370                 mutex_unlock(&irq_ptr->setup_mutex);
1371                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1372                 return rc;
1373         }
1374
1375         wait_event_interruptible_timeout(cdev->private->wait_q,
1376                 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1377                 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1378
1379         if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1380                 mutex_unlock(&irq_ptr->setup_mutex);
1381                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1382                 return -EIO;
1383         }
1384
1385         qdio_setup_ssqd_info(irq_ptr);
1386         DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1387         DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1388
1389         /* qebsm is now setup if available, initialize buffer states */
1390         qdio_init_buf_states(irq_ptr);
1391
1392         mutex_unlock(&irq_ptr->setup_mutex);
1393         qdio_print_subchannel_info(irq_ptr, cdev);
1394         qdio_setup_debug_entries(irq_ptr, cdev);
1395         return 0;
1396 }
1397 EXPORT_SYMBOL_GPL(qdio_establish);
1398
1399 /**
1400  * qdio_activate - activate queues on a qdio subchannel
1401  * @cdev: associated cdev
1402  */
1403 int qdio_activate(struct ccw_device *cdev)
1404 {
1405         struct qdio_irq *irq_ptr;
1406         int rc;
1407         unsigned long saveflags;
1408
1409         DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1410
1411         irq_ptr = cdev->private->qdio_data;
1412         if (!irq_ptr)
1413                 return -ENODEV;
1414
1415         if (cdev->private->state != DEV_STATE_ONLINE)
1416                 return -EINVAL;
1417
1418         mutex_lock(&irq_ptr->setup_mutex);
1419         if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1420                 rc = -EBUSY;
1421                 goto out;
1422         }
1423
1424         irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1425         irq_ptr->ccw.flags = CCW_FLAG_SLI;
1426         irq_ptr->ccw.count = irq_ptr->aqueue.count;
1427         irq_ptr->ccw.cda = 0;
1428
1429         spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1430         ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1431
1432         rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1433                               0, DOIO_DENY_PREFETCH);
1434         if (rc) {
1435                 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1436                 DBF_ERROR("rc:%4x", rc);
1437         }
1438         spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1439
1440         if (rc)
1441                 goto out;
1442
1443         if (is_thinint_irq(irq_ptr))
1444                 tiqdio_add_input_queues(irq_ptr);
1445
1446         /* wait for subchannel to become active */
1447         msleep(5);
1448
1449         switch (irq_ptr->state) {
1450         case QDIO_IRQ_STATE_STOPPED:
1451         case QDIO_IRQ_STATE_ERR:
1452                 mutex_unlock(&irq_ptr->setup_mutex);
1453                 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1454                 return -EIO;
1455         default:
1456                 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1457                 rc = 0;
1458         }
1459 out:
1460         mutex_unlock(&irq_ptr->setup_mutex);
1461         return rc;
1462 }
1463 EXPORT_SYMBOL_GPL(qdio_activate);
1464
1465 static inline int buf_in_between(int bufnr, int start, int count)
1466 {
1467         int end = add_buf(start, count);
1468
1469         if (end > start) {
1470                 if (bufnr >= start && bufnr < end)
1471                         return 1;
1472                 else
1473                         return 0;
1474         }
1475
1476         /* wrap-around case */
1477         if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1478             (bufnr < end))
1479                 return 1;
1480         else
1481                 return 0;
1482 }
1483
1484 /**
1485  * handle_inbound - reset processed input buffers
1486  * @q: queue containing the buffers
1487  * @callflags: flags
1488  * @bufnr: first buffer to process
1489  * @count: how many buffers are emptied
1490  */
1491 static void handle_inbound(struct qdio_q *q, unsigned int callflags,
1492                            int bufnr, int count)
1493 {
1494         int used, rc, diff;
1495
1496         if (!q->u.in.polling)
1497                 goto set;
1498
1499         /* protect against stop polling setting an ACK for an emptied slsb */
1500         if (count == QDIO_MAX_BUFFERS_PER_Q) {
1501                 /* overwriting everything, just delete polling status */
1502                 q->u.in.polling = 0;
1503                 q->u.in.ack_count = 0;
1504                 goto set;
1505         } else if (buf_in_between(q->last_move_ftc, bufnr, count)) {
1506                 if (is_qebsm(q)) {
1507                         /* partial overwrite, just update last_move_ftc */
1508                         diff = add_buf(bufnr, count);
1509                         diff = sub_buf(diff, q->last_move_ftc);
1510                         q->u.in.ack_count -= diff;
1511                         if (q->u.in.ack_count <= 0) {
1512                                 q->u.in.polling = 0;
1513                                 q->u.in.ack_count = 0;
1514                                 /* TODO: must we set last_move_ftc to something meaningful? */
1515                                 goto set;
1516                         }
1517                         q->last_move_ftc = add_buf(q->last_move_ftc, diff);
1518                 }
1519                 else
1520                         /* the only ACK will be deleted, so stop polling */
1521                         q->u.in.polling = 0;
1522         }
1523
1524 set:
1525         count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1526
1527         used = atomic_add_return(count, &q->nr_buf_used) - count;
1528         BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1529
1530         /* no need to signal as long as the adapter had free buffers */
1531         if (used)
1532                 return;
1533
1534         if (need_siga_in(q)) {
1535                 rc = qdio_siga_input(q);
1536                 if (rc)
1537                         q->qdio_error = rc;
1538         }
1539 }
1540
1541 /**
1542  * handle_outbound - process filled outbound buffers
1543  * @q: queue containing the buffers
1544  * @callflags: flags
1545  * @bufnr: first buffer to process
1546  * @count: how many buffers are filled
1547  */
1548 static void handle_outbound(struct qdio_q *q, unsigned int callflags,
1549                             int bufnr, int count)
1550 {
1551         unsigned char state;
1552         int used;
1553
1554         qdio_perf_stat_inc(&perf_stats.outbound_handler);
1555
1556         count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1557         used = atomic_add_return(count, &q->nr_buf_used);
1558         BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1559
1560         if (callflags & QDIO_FLAG_PCI_OUT)
1561                 q->u.out.pci_out_enabled = 1;
1562         else
1563                 q->u.out.pci_out_enabled = 0;
1564
1565         if (queue_type(q) == QDIO_IQDIO_QFMT) {
1566                 if (multicast_outbound(q))
1567                         qdio_kick_outbound_q(q);
1568                 else
1569                         if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1570                             (count > 1) &&
1571                             (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1572                                 /* exploit enhanced SIGA */
1573                                 q->u.out.use_enh_siga = 1;
1574                                 qdio_kick_outbound_q(q);
1575                         } else {
1576                                 /*
1577                                 * One siga-w per buffer required for unicast
1578                                 * HiperSockets.
1579                                 */
1580                                 q->u.out.use_enh_siga = 0;
1581                                 while (count--)
1582                                         qdio_kick_outbound_q(q);
1583                         }
1584                 goto out;
1585         }
1586
1587         if (need_siga_sync(q)) {
1588                 qdio_siga_sync_q(q);
1589                 goto out;
1590         }
1591
1592         /* try to fast requeue buffers */
1593         get_buf_state(q, prev_buf(bufnr), &state, 0);
1594         if (state != SLSB_CU_OUTPUT_PRIMED)
1595                 qdio_kick_outbound_q(q);
1596         else {
1597                 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1598                 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1599         }
1600 out:
1601         /* Fixme: could wait forever if called from process context */
1602         tasklet_schedule(&q->tasklet);
1603 }
1604
1605 /**
1606  * do_QDIO - process input or output buffers
1607  * @cdev: associated ccw_device for the qdio subchannel
1608  * @callflags: input or output and special flags from the program
1609  * @q_nr: queue number
1610  * @bufnr: buffer number
1611  * @count: how many buffers to process
1612  */
1613 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1614             int q_nr, int bufnr, int count)
1615 {
1616         struct qdio_irq *irq_ptr;
1617
1618         if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1619             (count > QDIO_MAX_BUFFERS_PER_Q) ||
1620             (q_nr > QDIO_MAX_QUEUES_PER_IRQ))
1621                 return -EINVAL;
1622
1623         if (!count)
1624                 return 0;
1625
1626         irq_ptr = cdev->private->qdio_data;
1627         if (!irq_ptr)
1628                 return -ENODEV;
1629
1630         if (callflags & QDIO_FLAG_SYNC_INPUT)
1631                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1632         else
1633                 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1634         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1635         DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1636
1637         if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1638                 return -EBUSY;
1639
1640         if (callflags & QDIO_FLAG_SYNC_INPUT)
1641                 handle_inbound(irq_ptr->input_qs[q_nr], callflags, bufnr,
1642                                count);
1643         else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1644                 handle_outbound(irq_ptr->output_qs[q_nr], callflags, bufnr,
1645                                 count);
1646         else
1647                 return -EINVAL;
1648         return 0;
1649 }
1650 EXPORT_SYMBOL_GPL(do_QDIO);
1651
1652 static int __init init_QDIO(void)
1653 {
1654         int rc;
1655
1656         rc = qdio_setup_init();
1657         if (rc)
1658                 return rc;
1659         rc = tiqdio_allocate_memory();
1660         if (rc)
1661                 goto out_cache;
1662         rc = qdio_debug_init();
1663         if (rc)
1664                 goto out_ti;
1665         rc = qdio_setup_perf_stats();
1666         if (rc)
1667                 goto out_debug;
1668         rc = tiqdio_register_thinints();
1669         if (rc)
1670                 goto out_perf;
1671         return 0;
1672
1673 out_perf:
1674         qdio_remove_perf_stats();
1675 out_debug:
1676         qdio_debug_exit();
1677 out_ti:
1678         tiqdio_free_memory();
1679 out_cache:
1680         qdio_setup_exit();
1681         return rc;
1682 }
1683
1684 static void __exit exit_QDIO(void)
1685 {
1686         tiqdio_unregister_thinints();
1687         tiqdio_free_memory();
1688         qdio_remove_perf_stats();
1689         qdio_debug_exit();
1690         qdio_setup_exit();
1691 }
1692
1693 module_init(init_QDIO);
1694 module_exit(exit_QDIO);